[PATCH v5 00/52] mtd: rework ECC layout definition

[PATCH v5 00/52] mtd: rework ECC layout definition

[Boris Brezillon]

Hello,

Hopefully the last version of this patchset (but don't be sad, I'm not
done bothering you with NAND related patches :-)).

If possible, I'd like to have as much Tested/Reviewed/Acked-by tags as
possible, particularly on the changes done in arch/arm and arch/mips
(since the last set of commits depends on those changes, I'd like to
take them in my nand/next branch, even if this imply creating an
immutable branch for the ARM and MIPS maintainers).

If nobody complains about this version, I'll merge it in 4.7.

Here comes the usual description:

This patchset aims at getting rid of the nand_ecclayout limitations.
struct nand_ecclayout is defining fixed eccpos and oobfree arrays which
can only be increased by modifying the MTD_MAX_ECCPOS_ENTRIES_LARGE and
MTD_MAX_OOBFREE_ENTRIES_LARGE macros.
This approach forces us to modify the macro values each time we add a
new NAND chip with a bigger OOB area, and increasing these arrays also
penalize all platforms, even those who only support small NAND devices
(with small OOB area).

The idea to overcome this limitation, is to define the ECC/OOB layout
by the mean of two functions: ->ecc() and ->free(), which will
basically return the same information has those stored in the
nand_ecclayout struct.

Another advantage of this solution is that ECC layouts are usually
following a repetitive pattern (i.e. leave X bytes free and put Y bytes
of ECC per ECC chunk), which allows one to implement the ->ecc()
and ->free() functions with a simple logic that can be applied
to any size of OOB.

Patches 1 to 4 are just cleanups or trivial fixes that can be taken
independently.

Also note that the last two commits are removing the nand_ecclayout
definition, thus preventing any new driver to use this structure.
Of course, this step can be delayed if some of the previous patches
are not accepted.

All those changes are available here [1].

Best Regards,

Boris

[1]https://github.com/bbrezillon/linux-0day/tree/nand/ecclayout

Changes since v4:
- dropped already applied patches
- patch the recently merged qcom driver

Changes since v3:
- fixed two bugs in mtd_ooblayout core implementation
- use ecc->total instead of (ecc->steps * ecc->bytes) in NAND drivers

Changes since v2:
- fixed a few bugs in the core and driver implementations

Changes since v1:
- unified the way of defining ECC and free bytes
- fixed a few bugs in some ->ecc()/->free() implementations

Boris Brezillon (50):
  mtd: add mtd_ooblayout_xxx() helper functions
  mtd: use mtd_ooblayout_xxx() helpers where appropriate
  mtd: nand: core: use mtd_ooblayout_xxx() helpers where appropriate
  mtd: nand: atmel: use mtd_ooblayout_xxx() helpers where appropriate
  mtd: nand: fsl_ifc: use mtd_ooblayout_xxx() helpers where appropriate
  mtd: nand: gpmi: use mtd_ooblayout_xxx() helpers where appropriate
  mtd: nand: lpc32xx: use mtd_ooblayout_xxx() helpers where appropriate
  mtd: nand: omap2: use mtd_ooblayout_xxx() helpers where appropriate
  mtd: nand: qcom: use mtd_ooblayout_xxx() helpers where appropriate
  mtd: onenand: use mtd_ooblayout_xxx() helpers where appropriate
  mtd: add mtd_set_ecclayout() helper function
  mtd: use mtd_set_ecclayout() where appropriate
  mtd: nand: use mtd_set_ecclayout() where appropriate
  mtd: onenand: use mtd_set_ecclayout() where appropriate
  mtd: docg3: use mtd_set_ecclayout() where appropriate
  mtd: create an mtd_ooblayout_ops struct to ease ECC layout definition
  mtd: docg3: switch to mtd_ooblayout_ops
  mtd: nand: implement the default mtd_ooblayout_ops
  mtd: nand: bch: switch to mtd_ooblayout_ops
  mtd: nand: sharpsl: switch to mtd_ooblayout_ops
  mtd: nand: jz4740: switch to mtd_ooblayout_ops
  mtd: nand: atmel: switch to mtd_ooblayout_ops
  mtd: nand: bf5xx: switch to mtd_ooblayout_ops
  mtd: nand: brcm: switch to mtd_ooblayout_ops
  mtd: nand: cafe: switch to mtd_ooblayout_ops
  mtd: nand: davinci: switch to mtd_ooblayout_ops
  mtd: nand: denali: switch to mtd_ooblayout_ops
  mtd: nand: diskonchip: switch to mtd_ooblayout_ops
  mtd: nand: docg4: switch to mtd_ooblayout_ops
  mtd: nand: fsl_elbc: switch to mtd_ooblayout_ops
  mtd: nand: fsl_ifc: switch to mtd_ooblayout_ops
  mtd: nand: fsmc: switch to mtd_ooblayout_ops
  mtd: nand: fsmc: get rid of the fsmc_nand_eccplace struct
  mtd: nand: gpmi: switch to mtd_ooblayout_ops
  mtd: nand: hisi504: switch to mtd_ooblayout_ops
  mtd: nand: jz4780: switch to mtd_ooblayout_ops
  mtd: nand: lpc32xx: switch to mtd_ooblayout_ops
  mtd: nand: mxc: switch to mtd_ooblayout_ops
  mtd: nand: omap2: switch to mtd_ooblayout_ops
  mtd: nand: pxa3xx: switch to mtd_ooblayout_ops
  mtd: nand: s3c2410: switch to mtd_ooblayout_ops
  mtd: nand: sh_flctl: switch to mtd_ooblayout_ops
  mtd: nand: sm_common: switch to mtd_ooblayout_ops
  mtd: nand: sunxi: switch to mtd_ooblayout_ops
  mtd: nand: vf610: switch to mtd_ooblayout_ops
  mtd: nand: qcom: switch to mtd_ooblayout_ops
  mtd: onenand: switch to mtd_ooblayout_ops
  staging: mt29f_spinand: switch to mtd_ooblayout_ops
  mtd: nand: kill the ecc->layout field
  mtd: kill the nand_ecclayout struct

 arch/arm/mach-pxa/spitz.c                       |  55 +++-
 arch/mips/include/asm/mach-jz4740/jz4740_nand.h |   2 +-
 arch/mips/jz4740/board-qi_lb60.c                |  87 +++---
 drivers/mtd/devices/docg3.c                     |  46 ++-
 drivers/mtd/mtdchar.c                           | 123 ++++++--
 drivers/mtd/mtdconcat.c                         |   2 +-
 drivers/mtd/mtdcore.c                           | 360 ++++++++++++++++++++++++
 drivers/mtd/mtdpart.c                           |  23 +-
 drivers/mtd/nand/atmel_nand.c                   | 130 ++++-----
 drivers/mtd/nand/bf5xx_nand.c                   |  51 ++--
 drivers/mtd/nand/brcmnand/brcmnand.c            | 258 ++++++++++-------
 drivers/mtd/nand/cafe_nand.c                    |  44 ++-
 drivers/mtd/nand/davinci_nand.c                 | 118 +++-----
 drivers/mtd/nand/denali.c                       |  50 +++-
 drivers/mtd/nand/diskonchip.c                   |  60 +++-
 drivers/mtd/nand/docg4.c                        |  33 ++-
 drivers/mtd/nand/fsl_elbc_nand.c                |  83 +++---
 drivers/mtd/nand/fsl_ifc_nand.c                 | 244 +++++-----------
 drivers/mtd/nand/fsmc_nand.c                    | 322 ++++++---------------
 drivers/mtd/nand/gpmi-nand/gpmi-nand.c          |  61 ++--
 drivers/mtd/nand/hisi504_nand.c                 |  26 +-
 drivers/mtd/nand/jz4740_nand.c                  |   2 +-
 drivers/mtd/nand/jz4780_nand.c                  |  19 +-
 drivers/mtd/nand/lpc32xx_mlc.c                  |  50 ++--
 drivers/mtd/nand/lpc32xx_slc.c                  |  58 +++-
 drivers/mtd/nand/mxc_nand.c                     | 212 +++++++-------
 drivers/mtd/nand/nand_base.c                    | 340 +++++++++++-----------
 drivers/mtd/nand/nand_bch.c                     |  27 +-
 drivers/mtd/nand/omap2.c                        | 217 ++++++++------
 drivers/mtd/nand/pxa3xx_nand.c                  | 104 ++++---
 drivers/mtd/nand/qcom_nandc.c                   |  87 +++---
 drivers/mtd/nand/s3c2410.c                      |  32 ++-
 drivers/mtd/nand/sh_flctl.c                     |  87 ++++--
 drivers/mtd/nand/sharpsl.c                      |   2 +-
 drivers/mtd/nand/sm_common.c                    |  93 ++++--
 drivers/mtd/nand/sunxi_nand.c                   | 114 ++++----
 drivers/mtd/nand/vf610_nfc.c                    |  34 +--
 drivers/mtd/onenand/onenand_base.c              | 235 ++++++++--------
 drivers/staging/mt29f_spinand/mt29f_spinand.c   |  48 ++--
 include/linux/mtd/fsmc.h                        |  18 --
 include/linux/mtd/mtd.h                         |  63 ++++-
 include/linux/mtd/nand.h                        |   5 +-
 include/linux/mtd/onenand.h                     |   2 -
 include/linux/mtd/sharpsl.h                     |   2 +-
 include/uapi/mtd/mtd-abi.h                      |   2 +-
 45 files changed, 2340 insertions(+), 1691 deletions(-)

-- 
2.5.0

[PATCH v5 00/52] mtd: rework ECC layout definition

[Boris Brezillon]

Hello,

Hopefully the last version of this patchset (but don't be sad, I'm not
done bothering you with NAND related patches :-)).

If possible, I'd like to have as much Tested/Reviewed/Acked-by tags as
possible, particularly on the changes done in arch/arm and arch/mips
(since the last set of commits depends on those changes, I'd like to
take them in my nand/next branch, even if this imply creating an
immutable branch for the ARM and MIPS maintainers).

If nobody complains about this version, I'll merge it in 4.7.

Here comes the usual description:

This patchset aims at getting rid of the nand_ecclayout limitations.
struct nand_ecclayout is defining fixed eccpos and oobfree arrays which
can only be increased by modifying the MTD_MAX_ECCPOS_ENTRIES_LARGE and
MTD_MAX_OOBFREE_ENTRIES_LARGE macros.
This approach forces us to modify the macro values each time we add a
new NAND chip with a bigger OOB area, and increasing these arrays also
penalize all platforms, even those who only support small NAND devices
(with small OOB area).

The idea to overcome this limitation, is to define the ECC/OOB layout
by the mean of two functions: ->ecc() and ->free(), which will
basically return the same information has those stored in the
nand_ecclayout struct.

Another advantage of this solution is that ECC layouts are usually
following a repetitive pattern (i.e. leave X bytes free and put Y bytes
of ECC per ECC chunk), which allows one to implement the ->ecc()
and ->free() functions with a simple logic that can be applied
to any size of OOB.

Patches 1 to 4 are just cleanups or trivial fixes that can be taken
independently.

Also note that the last two commits are removing the nand_ecclayout
definition, thus preventing any new driver to use this structure.
Of course, this step can be delayed if some of the previous patches
are not accepted.

All those changes are available here [1].

Best Regards,

Boris

[1]https://github.com/bbrezillon/linux-0day/tree/nand/ecclayout

Changes since v4:
- dropped already applied patches
- patch the recently merged qcom driver

Changes since v3:
- fixed two bugs in mtd_ooblayout core implementation
- use ecc->total instead of (ecc->steps * ecc->bytes) in NAND drivers

Changes since v2:
- fixed a few bugs in the core and driver implementations

Changes since v1:
- unified the way of defining ECC and free bytes
- fixed a few bugs in some ->ecc()/->free() implementations

Boris Brezillon (50):
  mtd: add mtd_ooblayout_xxx() helper functions
  mtd: use mtd_ooblayout_xxx() helpers where appropriate
  mtd: nand: core: use mtd_ooblayout_xxx() helpers where appropriate
  mtd: nand: atmel: use mtd_ooblayout_xxx() helpers where appropriate
  mtd: nand: fsl_ifc: use mtd_ooblayout_xxx() helpers where appropriate
  mtd: nand: gpmi: use mtd_ooblayout_xxx() helpers where appropriate
  mtd: nand: lpc32xx: use mtd_ooblayout_xxx() helpers where appropriate
  mtd: nand: omap2: use mtd_ooblayout_xxx() helpers where appropriate
  mtd: nand: qcom: use mtd_ooblayout_xxx() helpers where appropriate
  mtd: onenand: use mtd_ooblayout_xxx() helpers where appropriate
  mtd: add mtd_set_ecclayout() helper function
  mtd: use mtd_set_ecclayout() where appropriate
  mtd: nand: use mtd_set_ecclayout() where appropriate
  mtd: onenand: use mtd_set_ecclayout() where appropriate
  mtd: docg3: use mtd_set_ecclayout() where appropriate
  mtd: create an mtd_ooblayout_ops struct to ease ECC layout definition
  mtd: docg3: switch to mtd_ooblayout_ops
  mtd: nand: implement the default mtd_ooblayout_ops
  mtd: nand: bch: switch to mtd_ooblayout_ops
  mtd: nand: sharpsl: switch to mtd_ooblayout_ops
  mtd: nand: jz4740: switch to mtd_ooblayout_ops
  mtd: nand: atmel: switch to mtd_ooblayout_ops
  mtd: nand: bf5xx: switch to mtd_ooblayout_ops
  mtd: nand: brcm: switch to mtd_ooblayout_ops
  mtd: nand: cafe: switch to mtd_ooblayout_ops
  mtd: nand: davinci: switch to mtd_ooblayout_ops
  mtd: nand: denali: switch to mtd_ooblayout_ops
  mtd: nand: diskonchip: switch to mtd_ooblayout_ops
  mtd: nand: docg4: switch to mtd_ooblayout_ops
  mtd: nand: fsl_elbc: switch to mtd_ooblayout_ops
  mtd: nand: fsl_ifc: switch to mtd_ooblayout_ops
  mtd: nand: fsmc: switch to mtd_ooblayout_ops
  mtd: nand: fsmc: get rid of the fsmc_nand_eccplace struct
  mtd: nand: gpmi: switch to mtd_ooblayout_ops
  mtd: nand: hisi504: switch to mtd_ooblayout_ops
  mtd: nand: jz4780: switch to mtd_ooblayout_ops
  mtd: nand: lpc32xx: switch to mtd_ooblayout_ops
  mtd: nand: mxc: switch to mtd_ooblayout_ops
  mtd: nand: omap2: switch to mtd_ooblayout_ops
  mtd: nand: pxa3xx: switch to mtd_ooblayout_ops
  mtd: nand: s3c2410: switch to mtd_ooblayout_ops
  mtd: nand: sh_flctl: switch to mtd_ooblayout_ops
  mtd: nand: sm_common: switch to mtd_ooblayout_ops
  mtd: nand: sunxi: switch to mtd_ooblayout_ops
  mtd: nand: vf610: switch to mtd_ooblayout_ops
  mtd: nand: qcom: switch to mtd_ooblayout_ops
  mtd: onenand: switch to mtd_ooblayout_ops
  staging: mt29f_spinand: switch to mtd_ooblayout_ops
  mtd: nand: kill the ecc->layout field
  mtd: kill the nand_ecclayout struct

 arch/arm/mach-pxa/spitz.c                       |  55 +++-
 arch/mips/include/asm/mach-jz4740/jz4740_nand.h |   2 +-
 arch/mips/jz4740/board-qi_lb60.c                |  87 +++---
 drivers/mtd/devices/docg3.c                     |  46 ++-
 drivers/mtd/mtdchar.c                           | 123 ++++++--
 drivers/mtd/mtdconcat.c                         |   2 +-
 drivers/mtd/mtdcore.c                           | 360 ++++++++++++++++++++++++
 drivers/mtd/mtdpart.c                           |  23 +-
 drivers/mtd/nand/atmel_nand.c                   | 130 ++++-----
 drivers/mtd/nand/bf5xx_nand.c                   |  51 ++--
 drivers/mtd/nand/brcmnand/brcmnand.c            | 258 ++++++++++-------
 drivers/mtd/nand/cafe_nand.c                    |  44 ++-
 drivers/mtd/nand/davinci_nand.c                 | 118 +++-----
 drivers/mtd/nand/denali.c                       |  50 +++-
 drivers/mtd/nand/diskonchip.c                   |  60 +++-
 drivers/mtd/nand/docg4.c                        |  33 ++-
 drivers/mtd/nand/fsl_elbc_nand.c                |  83 +++---
 drivers/mtd/nand/fsl_ifc_nand.c                 | 244 +++++-----------
 drivers/mtd/nand/fsmc_nand.c                    | 322 ++++++---------------
 drivers/mtd/nand/gpmi-nand/gpmi-nand.c          |  61 ++--
 drivers/mtd/nand/hisi504_nand.c                 |  26 +-
 drivers/mtd/nand/jz4740_nand.c                  |   2 +-
 drivers/mtd/nand/jz4780_nand.c                  |  19 +-
 drivers/mtd/nand/lpc32xx_mlc.c                  |  50 ++--
 drivers/mtd/nand/lpc32xx_slc.c                  |  58 +++-
 drivers/mtd/nand/mxc_nand.c                     | 212 +++++++-------
 drivers/mtd/nand/nand_base.c                    | 340 +++++++++++-----------
 drivers/mtd/nand/nand_bch.c                     |  27 +-
 drivers/mtd/nand/omap2.c                        | 217 ++++++++------
 drivers/mtd/nand/pxa3xx_nand.c                  | 104 ++++---
 drivers/mtd/nand/qcom_nandc.c                   |  87 +++---
 drivers/mtd/nand/s3c2410.c                      |  32 ++-
 drivers/mtd/nand/sh_flctl.c                     |  87 ++++--
 drivers/mtd/nand/sharpsl.c                      |   2 +-
 drivers/mtd/nand/sm_common.c                    |  93 ++++--
 drivers/mtd/nand/sunxi_nand.c                   | 114 ++++----
 drivers/mtd/nand/vf610_nfc.c                    |  34 +--
 drivers/mtd/onenand/onenand_base.c              | 235 ++++++++--------
 drivers/staging/mt29f_spinand/mt29f_spinand.c   |  48 ++--
 include/linux/mtd/fsmc.h                        |  18 --
 include/linux/mtd/mtd.h                         |  63 ++++-
 include/linux/mtd/nand.h                        |   5 +-
 include/linux/mtd/onenand.h                     |   2 -
 include/linux/mtd/sharpsl.h                     |   2 +-
 include/uapi/mtd/mtd-abi.h                      |   2 +-
 45 files changed, 2340 insertions(+), 1691 deletions(-)

-- 
2.5.0

[PATCH v5 00/52] mtd: rework ECC layout definition

[Boris Brezillon]

Hello,

Hopefully the last version of this patchset (but don't be sad, I'm not
done bothering you with NAND related patches :-)).

If possible, I'd like to have as much Tested/Reviewed/Acked-by tags as
possible, particularly on the changes done in arch/arm and arch/mips
(since the last set of commits depends on those changes, I'd like to
take them in my nand/next branch, even if this imply creating an
immutable branch for the ARM and MIPS maintainers).

If nobody complains about this version, I'll merge it in 4.7.

Here comes the usual description:

This patchset aims at getting rid of the nand_ecclayout limitations.
struct nand_ecclayout is defining fixed eccpos and oobfree arrays which
can only be increased by modifying the MTD_MAX_ECCPOS_ENTRIES_LARGE and
MTD_MAX_OOBFREE_ENTRIES_LARGE macros.
This approach forces us to modify the macro values each time we add a
new NAND chip with a bigger OOB area, and increasing these arrays also
penalize all platforms, even those who only support small NAND devices
(with small OOB area).

The idea to overcome this limitation, is to define the ECC/OOB layout
by the mean of two functions: ->ecc() and ->free(), which will
basically return the same information has those stored in the
nand_ecclayout struct.

Another advantage of this solution is that ECC layouts are usually
following a repetitive pattern (i.e. leave X bytes free and put Y bytes
of ECC per ECC chunk), which allows one to implement the ->ecc()
and ->free() functions with a simple logic that can be applied
to any size of OOB.

Patches 1 to 4 are just cleanups or trivial fixes that can be taken
independently.

Also note that the last two commits are removing the nand_ecclayout
definition, thus preventing any new driver to use this structure.
Of course, this step can be delayed if some of the previous patches
are not accepted.

All those changes are available here [1].

Best Regards,

Boris

[1]https://github.com/bbrezillon/linux-0day/tree/nand/ecclayout

Changes since v4:
- dropped already applied patches
- patch the recently merged qcom driver

Changes since v3:
- fixed two bugs in mtd_ooblayout core implementation
- use ecc->total instead of (ecc->steps * ecc->bytes) in NAND drivers

Changes since v2:
- fixed a few bugs in the core and driver implementations

Changes since v1:
- unified the way of defining ECC and free bytes
- fixed a few bugs in some ->ecc()/->free() implementations

Boris Brezillon (50):
  mtd: add mtd_ooblayout_xxx() helper functions
  mtd: use mtd_ooblayout_xxx() helpers where appropriate
  mtd: nand: core: use mtd_ooblayout_xxx() helpers where appropriate
  mtd: nand: atmel: use mtd_ooblayout_xxx() helpers where appropriate
  mtd: nand: fsl_ifc: use mtd_ooblayout_xxx() helpers where appropriate
  mtd: nand: gpmi: use mtd_ooblayout_xxx() helpers where appropriate
  mtd: nand: lpc32xx: use mtd_ooblayout_xxx() helpers where appropriate
  mtd: nand: omap2: use mtd_ooblayout_xxx() helpers where appropriate
  mtd: nand: qcom: use mtd_ooblayout_xxx() helpers where appropriate
  mtd: onenand: use mtd_ooblayout_xxx() helpers where appropriate
  mtd: add mtd_set_ecclayout() helper function
  mtd: use mtd_set_ecclayout() where appropriate
  mtd: nand: use mtd_set_ecclayout() where appropriate
  mtd: onenand: use mtd_set_ecclayout() where appropriate
  mtd: docg3: use mtd_set_ecclayout() where appropriate
  mtd: create an mtd_ooblayout_ops struct to ease ECC layout definition
  mtd: docg3: switch to mtd_ooblayout_ops
  mtd: nand: implement the default mtd_ooblayout_ops
  mtd: nand: bch: switch to mtd_ooblayout_ops
  mtd: nand: sharpsl: switch to mtd_ooblayout_ops
  mtd: nand: jz4740: switch to mtd_ooblayout_ops
  mtd: nand: atmel: switch to mtd_ooblayout_ops
  mtd: nand: bf5xx: switch to mtd_ooblayout_ops
  mtd: nand: brcm: switch to mtd_ooblayout_ops
  mtd: nand: cafe: switch to mtd_ooblayout_ops
  mtd: nand: davinci: switch to mtd_ooblayout_ops
  mtd: nand: denali: switch to mtd_ooblayout_ops
  mtd: nand: diskonchip: switch to mtd_ooblayout_ops
  mtd: nand: docg4: switch to mtd_ooblayout_ops
  mtd: nand: fsl_elbc: switch to mtd_ooblayout_ops
  mtd: nand: fsl_ifc: switch to mtd_ooblayout_ops
  mtd: nand: fsmc: switch to mtd_ooblayout_ops
  mtd: nand: fsmc: get rid of the fsmc_nand_eccplace struct
  mtd: nand: gpmi: switch to mtd_ooblayout_ops
  mtd: nand: hisi504: switch to mtd_ooblayout_ops
  mtd: nand: jz4780: switch to mtd_ooblayout_ops
  mtd: nand: lpc32xx: switch to mtd_ooblayout_ops
  mtd: nand: mxc: switch to mtd_ooblayout_ops
  mtd: nand: omap2: switch to mtd_ooblayout_ops
  mtd: nand: pxa3xx: switch to mtd_ooblayout_ops
  mtd: nand: s3c2410: switch to mtd_ooblayout_ops
  mtd: nand: sh_flctl: switch to mtd_ooblayout_ops
  mtd: nand: sm_common: switch to mtd_ooblayout_ops
  mtd: nand: sunxi: switch to mtd_ooblayout_ops
  mtd: nand: vf610: switch to mtd_ooblayout_ops
  mtd: nand: qcom: switch to mtd_ooblayout_ops
  mtd: onenand: switch to mtd_ooblayout_ops
  staging: mt29f_spinand: switch to mtd_ooblayout_ops
  mtd: nand: kill the ecc->layout field
  mtd: kill the nand_ecclayout struct

 arch/arm/mach-pxa/spitz.c                       |  55 +++-
 arch/mips/include/asm/mach-jz4740/jz4740_nand.h |   2 +-
 arch/mips/jz4740/board-qi_lb60.c                |  87 +++---
 drivers/mtd/devices/docg3.c                     |  46 ++-
 drivers/mtd/mtdchar.c                           | 123 ++++++--
 drivers/mtd/mtdconcat.c                         |   2 +-
 drivers/mtd/mtdcore.c                           | 360 ++++++++++++++++++++++++
 drivers/mtd/mtdpart.c                           |  23 +-
 drivers/mtd/nand/atmel_nand.c                   | 130 ++++-----
 drivers/mtd/nand/bf5xx_nand.c                   |  51 ++--
 drivers/mtd/nand/brcmnand/brcmnand.c            | 258 ++++++++++-------
 drivers/mtd/nand/cafe_nand.c                    |  44 ++-
 drivers/mtd/nand/davinci_nand.c                 | 118 +++-----
 drivers/mtd/nand/denali.c                       |  50 +++-
 drivers/mtd/nand/diskonchip.c                   |  60 +++-
 drivers/mtd/nand/docg4.c                        |  33 ++-
 drivers/mtd/nand/fsl_elbc_nand.c                |  83 +++---
 drivers/mtd/nand/fsl_ifc_nand.c                 | 244 +++++-----------
 drivers/mtd/nand/fsmc_nand.c                    | 322 ++++++---------------
 drivers/mtd/nand/gpmi-nand/gpmi-nand.c          |  61 ++--
 drivers/mtd/nand/hisi504_nand.c                 |  26 +-
 drivers/mtd/nand/jz4740_nand.c                  |   2 +-
 drivers/mtd/nand/jz4780_nand.c                  |  19 +-
 drivers/mtd/nand/lpc32xx_mlc.c                  |  50 ++--
 drivers/mtd/nand/lpc32xx_slc.c                  |  58 +++-
 drivers/mtd/nand/mxc_nand.c                     | 212 +++++++-------
 drivers/mtd/nand/nand_base.c                    | 340 +++++++++++-----------
 drivers/mtd/nand/nand_bch.c                     |  27 +-
 drivers/mtd/nand/omap2.c                        | 217 ++++++++------
 drivers/mtd/nand/pxa3xx_nand.c                  | 104 ++++---
 drivers/mtd/nand/qcom_nandc.c                   |  87 +++---
 drivers/mtd/nand/s3c2410.c                      |  32 ++-
 drivers/mtd/nand/sh_flctl.c                     |  87 ++++--
 drivers/mtd/nand/sharpsl.c                      |   2 +-
 drivers/mtd/nand/sm_common.c                    |  93 ++++--
 drivers/mtd/nand/sunxi_nand.c                   | 114 ++++----
 drivers/mtd/nand/vf610_nfc.c                    |  34 +--
 drivers/mtd/onenand/onenand_base.c              | 235 ++++++++--------
 drivers/staging/mt29f_spinand/mt29f_spinand.c   |  48 ++--
 include/linux/mtd/fsmc.h                        |  18 --
 include/linux/mtd/mtd.h                         |  63 ++++-
 include/linux/mtd/nand.h                        |   5 +-
 include/linux/mtd/onenand.h                     |   2 -
 include/linux/mtd/sharpsl.h                     |   2 +-
 include/uapi/mtd/mtd-abi.h                      |   2 +-
 45 files changed, 2340 insertions(+), 1691 deletions(-)

-- 
2.5.0

[PATCH v5 01/50] mtd: add mtd_ooblayout_xxx() helper functions

[Boris Brezillon]

In order to make the ecclayout definition completely dynamic we need to
rework the way the OOB layout are defined and iterated.

Create a few mtd_ooblayout_xxx() helpers to ease OOB bytes manipulation
and hide ecclayout internals to their users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/mtdcore.c   | 400 ++++++++++++++++++++++++++++++++++++++++++++++++
 include/linux/mtd/mtd.h |  33 ++++
 2 files changed, 433 insertions(+)

diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index 3096251..9fc278a 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -997,6 +997,406 @@ int mtd_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops)
 }
 EXPORT_SYMBOL_GPL(mtd_read_oob);
 
+/**
+ * mtd_ooblayout_ecc - Get the OOB region definition of a specific ECC section
+ * @mtd: MTD device structure
+ * @section: ECC section. Depending on the layout you may have all the ECC
+ *	     bytes stored in a single contiguous section, or one section
+ *	     per ECC chunk (and sometime several sections for a single ECC
+ *	     ECC chunk)
+ * @oobecc: OOB region struct filled with the appropriate ECC position
+ *	    information
+ *
+ * This functions return ECC section information in the OOB area. I you want
+ * to get all the ECC bytes information, then you should call
+ * mtd_ooblayout_ecc(mtd, section++, oobecc) until it returns -ERANGE.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+int mtd_ooblayout_ecc(struct mtd_info *mtd, int section,
+		      struct mtd_oob_region *oobecc)
+{
+	int eccbyte = 0, cursection = 0, length = 0, eccpos = 0;
+
+	memset(oobecc, 0, sizeof(*oobecc));
+
+	if (!mtd || section < 0)
+		return -EINVAL;
+
+	if (!mtd->ecclayout)
+		return -ENOTSUPP;
+
+	/*
+	 * This logic allows us to reuse the ->ecclayout information and
+	 * expose them as ECC regions (as done for the OOB free regions).
+	 *
+	 * TODO: this should be dropped as soon as we get rid of the
+	 * ->ecclayout field.
+	 */
+	for (eccbyte = 0; eccbyte < mtd->ecclayout->eccbytes; eccbyte++) {
+		eccpos = mtd->ecclayout->eccpos[eccbyte];
+
+		if (eccbyte < mtd->ecclayout->eccbytes - 1) {
+			int neccpos = mtd->ecclayout->eccpos[eccbyte + 1];
+
+			if (eccpos + 1 == neccpos) {
+				length++;
+				continue;
+			}
+		}
+
+		if (section == cursection)
+			break;
+
+		length = 0;
+		cursection++;
+	}
+
+	if (cursection != section || eccbyte >= mtd->ecclayout->eccbytes)
+		return -ERANGE;
+
+	oobecc->length = length + 1;
+	oobecc->offset = eccpos - length;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(mtd_ooblayout_ecc);
+
+/**
+ * mtd_ooblayout_free - Get the OOB region definition of a specific free
+ *			section
+ * @mtd: MTD device structure
+ * @section: Free section you are interested in. Depending on the layout
+ *	     you may have all the free bytes stored in a single contiguous
+ *	     section, or one section per ECC chunk plus an extra section
+ *	     for the remaining bytes (or other funky layout).
+ * @oobfree: OOB region struct filled with the appropriate free position
+ *	     information
+ *
+ * This functions return free bytes position in the OOB area. I you want
+ * to get all the free bytes information, then you should call
+ * mtd_ooblayout_free(mtd, section++, oobfree) until it returns -ERANGE.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+int mtd_ooblayout_free(struct mtd_info *mtd, int section,
+		       struct mtd_oob_region *oobfree)
+{
+	memset(oobfree, 0, sizeof(*oobfree));
+
+	if (!mtd || section < 0)
+		return -EINVAL;
+
+	if (!mtd->ecclayout)
+		return -ENOTSUPP;
+
+	if (section >= MTD_MAX_OOBFREE_ENTRIES_LARGE)
+		return -ERANGE;
+
+	oobfree->offset = mtd->ecclayout->oobfree[section].offset;
+	oobfree->length = mtd->ecclayout->oobfree[section].length;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(mtd_ooblayout_free);
+
+/**
+ * mtd_ooblayout_find_region - Find the region attached to a specific byte
+ * @mtd: mtd info structure
+ * @byte: the byte we are searching for
+ * @sectionp: pointer where the section id will be stored
+ * @oobregion: used to retrieve the ECC position
+ * @iter: iterator function. Should be either mtd_ooblayout_free or
+ *	  mtd_ooblayout_ecc depending on the region type you're searching for
+ *
+ * This functions returns the section id and oobregion information of a
+ * specific byte. For example, say you want to know where the 4th ECC byte is
+ * stored, you'll use:
+ *
+ * mtd_ooblayout_find_region(mtd, 3, &section, &oobregion, mtd_ooblayout_ecc);
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+static int mtd_ooblayout_find_region(struct mtd_info *mtd, int byte,
+				int *sectionp, struct mtd_oob_region *oobregion,
+				int (*iter)(struct mtd_info *,
+					    int section,
+					    struct mtd_oob_region *oobregion))
+{
+	int pos = 0, ret, section = 0;
+
+	memset(oobregion, 0, sizeof(*oobregion));
+
+	while (1) {
+		ret = iter(mtd, section, oobregion);
+		if (ret)
+			return ret;
+
+		if (pos + oobregion->length > byte)
+			break;
+
+		pos += oobregion->length;
+		section++;
+	}
+
+	/*
+	 * Adjust region info to make it start at the beginning at the
+	 * 'start' ECC byte.
+	 */
+	oobregion->offset += byte - pos;
+	oobregion->length -= byte - pos;
+	*sectionp = section;
+
+	return 0;
+}
+
+/**
+ * mtd_ooblayout_find_eccregion - Find the ECC region attached to a specific
+ *				  ECC byte
+ * @mtd: mtd info structure
+ * @eccbyte: the byte we are searching for
+ * @sectionp: pointer where the section id will be stored
+ * @oobregion: OOB region information
+ *
+ * Works like mtd_ooblayout_find_region() except it searches for a specific ECC
+ * byte.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+int mtd_ooblayout_find_eccregion(struct mtd_info *mtd, int eccbyte,
+				 int *section,
+				 struct mtd_oob_region *oobregion)
+{
+	return mtd_ooblayout_find_region(mtd, eccbyte, section, oobregion,
+					 mtd_ooblayout_ecc);
+}
+EXPORT_SYMBOL_GPL(mtd_ooblayout_find_eccregion);
+
+/**
+ * mtd_ooblayout_get_bytes - Extract OOB bytes from the oob buffer
+ * @mtd: mtd info structure
+ * @buf: destination buffer to store OOB bytes
+ * @oobbuf: OOB buffer
+ * @start: first byte to retrieve
+ * @nbytes: number of bytes to retrieve
+ * @iter: section iterator
+ *
+ * Extract bytes attached to a specific category (ECC or free)
+ * from the OOB buffer and copy them into buf.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+static int mtd_ooblayout_get_bytes(struct mtd_info *mtd, u8 *buf,
+				const u8 *oobbuf, int start, int nbytes,
+				int (*iter)(struct mtd_info *,
+					    int section,
+					    struct mtd_oob_region *oobregion))
+{
+	struct mtd_oob_region oobregion = { };
+	int section = 0, ret;
+
+	ret = mtd_ooblayout_find_region(mtd, start, &section,
+					&oobregion, iter);
+
+	while (!ret) {
+		int cnt;
+
+		cnt = oobregion.length > nbytes ? nbytes : oobregion.length;
+		memcpy(buf, oobbuf + oobregion.offset, cnt);
+		buf += cnt;
+		nbytes -= cnt;
+
+		if (!nbytes)
+			break;
+
+		ret = iter(mtd, ++section, &oobregion);
+	}
+
+	return ret;
+}
+
+/**
+ * mtd_ooblayout_set_bytes - put OOB bytes into the oob buffer
+ * @mtd: mtd info structure
+ * @buf: source buffer to get OOB bytes from
+ * @oobbuf: OOB buffer
+ * @start: first OOB byte to set
+ * @nbytes: number of OOB bytes to set
+ * @iter: section iterator
+ *
+ * Fill the OOB buffer with data provided in buf. The category (ECC or free)
+ * is selected by passing the appropriate iterator.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+static int mtd_ooblayout_set_bytes(struct mtd_info *mtd, const u8 *buf,
+				u8 *oobbuf, int start, int nbytes,
+				int (*iter)(struct mtd_info *,
+					    int section,
+					    struct mtd_oob_region *oobregion))
+{
+	struct mtd_oob_region oobregion = { };
+	int section = 0, ret;
+
+	ret = mtd_ooblayout_find_region(mtd, start, &section,
+					&oobregion, iter);
+
+	while (!ret) {
+		int cnt;
+
+		cnt = oobregion.length > nbytes ? nbytes : oobregion.length;
+		memcpy(oobbuf + oobregion.offset, buf, cnt);
+		buf += cnt;
+		nbytes -= cnt;
+
+		if (!nbytes)
+			break;
+
+		ret = iter(mtd, ++section, &oobregion);
+	}
+
+	return ret;
+}
+
+/**
+ * mtd_ooblayout_count_bytes - count the number of bytes in a OOB category
+ * @mtd: mtd info structure
+ * @iter: category iterator
+ *
+ * Count the number of bytes in a given category.
+ *
+ * Returns a positive value on success, a negative error code otherwise.
+ */
+static int mtd_ooblayout_count_bytes(struct mtd_info *mtd,
+				int (*iter)(struct mtd_info *,
+					    int section,
+					    struct mtd_oob_region *oobregion))
+{
+	struct mtd_oob_region oobregion = { };
+	int section = 0, ret, nbytes = 0;
+
+	while (1) {
+		ret = iter(mtd, section++, &oobregion);
+		if (ret) {
+			if (ret == -ERANGE)
+				ret = nbytes;
+			break;
+		}
+
+		nbytes += oobregion.length;
+	}
+
+	return ret;
+}
+
+/**
+ * mtd_ooblayout_get_eccbytes - extract ECC bytes from the oob buffer
+ * @mtd: mtd info structure
+ * @eccbuf: destination buffer to store ECC bytes
+ * @oobbuf: OOB buffer
+ * @start: first ECC byte to retrieve
+ * @nbytes: number of ECC bytes to retrieve
+ *
+ * Works like mtd_ooblayout_get_bytes(), except it acts on ECC bytes.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+int mtd_ooblayout_get_eccbytes(struct mtd_info *mtd, u8 *eccbuf,
+			       const u8 *oobbuf, int start, int nbytes)
+{
+	return mtd_ooblayout_get_bytes(mtd, eccbuf, oobbuf, start, nbytes,
+				       mtd_ooblayout_ecc);
+}
+EXPORT_SYMBOL_GPL(mtd_ooblayout_get_eccbytes);
+
+/**
+ * mtd_ooblayout_set_eccbytes - set ECC bytes into the oob buffer
+ * @mtd: mtd info structure
+ * @eccbuf: source buffer to get ECC bytes from
+ * @oobbuf: OOB buffer
+ * @start: first ECC byte to set
+ * @nbytes: number of ECC bytes to set
+ *
+ * Works like mtd_ooblayout_set_bytes(), except it acts on ECC bytes.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+int mtd_ooblayout_set_eccbytes(struct mtd_info *mtd, const u8 *eccbuf,
+			       u8 *oobbuf, int start, int nbytes)
+{
+	return mtd_ooblayout_set_bytes(mtd, eccbuf, oobbuf, start, nbytes,
+				       mtd_ooblayout_ecc);
+}
+EXPORT_SYMBOL_GPL(mtd_ooblayout_set_eccbytes);
+
+/**
+ * mtd_ooblayout_get_databytes - extract data bytes from the oob buffer
+ * @mtd: mtd info structure
+ * @databuf: destination buffer to store ECC bytes
+ * @oobbuf: OOB buffer
+ * @start: first ECC byte to retrieve
+ * @nbytes: number of ECC bytes to retrieve
+ *
+ * Works like mtd_ooblayout_get_bytes(), except it acts on free bytes.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+int mtd_ooblayout_get_databytes(struct mtd_info *mtd, u8 *databuf,
+				const u8 *oobbuf, int start, int nbytes)
+{
+	return mtd_ooblayout_get_bytes(mtd, databuf, oobbuf, start, nbytes,
+				       mtd_ooblayout_free);
+}
+EXPORT_SYMBOL_GPL(mtd_ooblayout_get_databytes);
+
+/**
+ * mtd_ooblayout_get_eccbytes - set data bytes into the oob buffer
+ * @mtd: mtd info structure
+ * @eccbuf: source buffer to get data bytes from
+ * @oobbuf: OOB buffer
+ * @start: first ECC byte to set
+ * @nbytes: number of ECC bytes to set
+ *
+ * Works like mtd_ooblayout_get_bytes(), except it acts on free bytes.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+int mtd_ooblayout_set_databytes(struct mtd_info *mtd, const u8 *databuf,
+				u8 *oobbuf, int start, int nbytes)
+{
+	return mtd_ooblayout_set_bytes(mtd, databuf, oobbuf, start, nbytes,
+				       mtd_ooblayout_free);
+}
+EXPORT_SYMBOL_GPL(mtd_ooblayout_set_databytes);
+
+/**
+ * mtd_ooblayout_count_freebytes - count the number of free bytes in OOB
+ * @mtd: mtd info structure
+ *
+ * Works like mtd_ooblayout_count_bytes(), except it count free bytes.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+int mtd_ooblayout_count_freebytes(struct mtd_info *mtd)
+{
+	return mtd_ooblayout_count_bytes(mtd, mtd_ooblayout_free);
+}
+EXPORT_SYMBOL_GPL(mtd_ooblayout_count_freebytes);
+
+/**
+ * mtd_ooblayout_count_freebytes - count the number of ECC bytes in OOB
+ * @mtd: mtd info structure
+ *
+ * Works like mtd_ooblayout_count_bytes(), except it count ECC bytes.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd)
+{
+	return mtd_ooblayout_count_bytes(mtd, mtd_ooblayout_ecc);
+}
+EXPORT_SYMBOL_GPL(mtd_ooblayout_count_eccbytes);
+
 /*
  * Method to access the protection register area, present in some flash
  * devices. The user data is one time programmable but the factory data is read
diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index 7712721..b141f26 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -108,6 +108,21 @@ struct nand_ecclayout {
 	struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES_LARGE];
 };
 
+/**
+ * struct mtd_oob_region - oob region definition
+ * @offset: region offset
+ * @length: region length
+ *
+ * This structure describes a region of the OOB area, and is used
+ * to retrieve ECC or free bytes sections.
+ * Each section is defined by an offset within the OOB area and a
+ * length.
+ */
+struct mtd_oob_region {
+	u32 offset;
+	u32 length;
+};
+
 struct module;	/* only needed for owner field in mtd_info */
 
 struct mtd_info {
@@ -253,6 +268,24 @@ struct mtd_info {
 	int usecount;
 };
 
+int mtd_ooblayout_ecc(struct mtd_info *mtd, int section,
+		      struct mtd_oob_region *oobecc);
+int mtd_ooblayout_find_eccregion(struct mtd_info *mtd, int eccbyte,
+				 int *section,
+				 struct mtd_oob_region *oobregion);
+int mtd_ooblayout_get_eccbytes(struct mtd_info *mtd, u8 *eccbuf,
+			       const u8 *oobbuf, int start, int nbytes);
+int mtd_ooblayout_set_eccbytes(struct mtd_info *mtd, const u8 *eccbuf,
+			       u8 *oobbuf, int start, int nbytes);
+int mtd_ooblayout_free(struct mtd_info *mtd, int section,
+		       struct mtd_oob_region *oobfree);
+int mtd_ooblayout_get_databytes(struct mtd_info *mtd, u8 *databuf,
+				const u8 *oobbuf, int start, int nbytes);
+int mtd_ooblayout_set_databytes(struct mtd_info *mtd, const u8 *databuf,
+				u8 *oobbuf, int start, int nbytes);
+int mtd_ooblayout_count_freebytes(struct mtd_info *mtd);
+int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd);
+
 static inline void mtd_set_of_node(struct mtd_info *mtd,
 				   struct device_node *np)
 {
-- 
2.5.0

[PATCH v5 01/50] mtd: add mtd_ooblayout_xxx() helper functions

[Boris Brezillon]

In order to make the ecclayout definition completely dynamic we need to
rework the way the OOB layout are defined and iterated.

Create a few mtd_ooblayout_xxx() helpers to ease OOB bytes manipulation
and hide ecclayout internals to their users.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/mtd/mtdcore.c   | 400 ++++++++++++++++++++++++++++++++++++++++++++++++
 include/linux/mtd/mtd.h |  33 ++++
 2 files changed, 433 insertions(+)

diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index 3096251..9fc278a 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -997,6 +997,406 @@ int mtd_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops)
 }
 EXPORT_SYMBOL_GPL(mtd_read_oob);
 
+/**
+ * mtd_ooblayout_ecc - Get the OOB region definition of a specific ECC section
+ * @mtd: MTD device structure
+ * @section: ECC section. Depending on the layout you may have all the ECC
+ *	     bytes stored in a single contiguous section, or one section
+ *	     per ECC chunk (and sometime several sections for a single ECC
+ *	     ECC chunk)
+ * @oobecc: OOB region struct filled with the appropriate ECC position
+ *	    information
+ *
+ * This functions return ECC section information in the OOB area. I you want
+ * to get all the ECC bytes information, then you should call
+ * mtd_ooblayout_ecc(mtd, section++, oobecc) until it returns -ERANGE.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+int mtd_ooblayout_ecc(struct mtd_info *mtd, int section,
+		      struct mtd_oob_region *oobecc)
+{
+	int eccbyte = 0, cursection = 0, length = 0, eccpos = 0;
+
+	memset(oobecc, 0, sizeof(*oobecc));
+
+	if (!mtd || section < 0)
+		return -EINVAL;
+
+	if (!mtd->ecclayout)
+		return -ENOTSUPP;
+
+	/*
+	 * This logic allows us to reuse the ->ecclayout information and
+	 * expose them as ECC regions (as done for the OOB free regions).
+	 *
+	 * TODO: this should be dropped as soon as we get rid of the
+	 * ->ecclayout field.
+	 */
+	for (eccbyte = 0; eccbyte < mtd->ecclayout->eccbytes; eccbyte++) {
+		eccpos = mtd->ecclayout->eccpos[eccbyte];
+
+		if (eccbyte < mtd->ecclayout->eccbytes - 1) {
+			int neccpos = mtd->ecclayout->eccpos[eccbyte + 1];
+
+			if (eccpos + 1 == neccpos) {
+				length++;
+				continue;
+			}
+		}
+
+		if (section == cursection)
+			break;
+
+		length = 0;
+		cursection++;
+	}
+
+	if (cursection != section || eccbyte >= mtd->ecclayout->eccbytes)
+		return -ERANGE;
+
+	oobecc->length = length + 1;
+	oobecc->offset = eccpos - length;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(mtd_ooblayout_ecc);
+
+/**
+ * mtd_ooblayout_free - Get the OOB region definition of a specific free
+ *			section
+ * @mtd: MTD device structure
+ * @section: Free section you are interested in. Depending on the layout
+ *	     you may have all the free bytes stored in a single contiguous
+ *	     section, or one section per ECC chunk plus an extra section
+ *	     for the remaining bytes (or other funky layout).
+ * @oobfree: OOB region struct filled with the appropriate free position
+ *	     information
+ *
+ * This functions return free bytes position in the OOB area. I you want
+ * to get all the free bytes information, then you should call
+ * mtd_ooblayout_free(mtd, section++, oobfree) until it returns -ERANGE.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+int mtd_ooblayout_free(struct mtd_info *mtd, int section,
+		       struct mtd_oob_region *oobfree)
+{
+	memset(oobfree, 0, sizeof(*oobfree));
+
+	if (!mtd || section < 0)
+		return -EINVAL;
+
+	if (!mtd->ecclayout)
+		return -ENOTSUPP;
+
+	if (section >= MTD_MAX_OOBFREE_ENTRIES_LARGE)
+		return -ERANGE;
+
+	oobfree->offset = mtd->ecclayout->oobfree[section].offset;
+	oobfree->length = mtd->ecclayout->oobfree[section].length;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(mtd_ooblayout_free);
+
+/**
+ * mtd_ooblayout_find_region - Find the region attached to a specific byte
+ * @mtd: mtd info structure
+ * @byte: the byte we are searching for
+ * @sectionp: pointer where the section id will be stored
+ * @oobregion: used to retrieve the ECC position
+ * @iter: iterator function. Should be either mtd_ooblayout_free or
+ *	  mtd_ooblayout_ecc depending on the region type you're searching for
+ *
+ * This functions returns the section id and oobregion information of a
+ * specific byte. For example, say you want to know where the 4th ECC byte is
+ * stored, you'll use:
+ *
+ * mtd_ooblayout_find_region(mtd, 3, &section, &oobregion, mtd_ooblayout_ecc);
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+static int mtd_ooblayout_find_region(struct mtd_info *mtd, int byte,
+				int *sectionp, struct mtd_oob_region *oobregion,
+				int (*iter)(struct mtd_info *,
+					    int section,
+					    struct mtd_oob_region *oobregion))
+{
+	int pos = 0, ret, section = 0;
+
+	memset(oobregion, 0, sizeof(*oobregion));
+
+	while (1) {
+		ret = iter(mtd, section, oobregion);
+		if (ret)
+			return ret;
+
+		if (pos + oobregion->length > byte)
+			break;
+
+		pos += oobregion->length;
+		section++;
+	}
+
+	/*
+	 * Adjust region info to make it start at the beginning at the
+	 * 'start' ECC byte.
+	 */
+	oobregion->offset += byte - pos;
+	oobregion->length -= byte - pos;
+	*sectionp = section;
+
+	return 0;
+}
+
+/**
+ * mtd_ooblayout_find_eccregion - Find the ECC region attached to a specific
+ *				  ECC byte
+ * @mtd: mtd info structure
+ * @eccbyte: the byte we are searching for
+ * @sectionp: pointer where the section id will be stored
+ * @oobregion: OOB region information
+ *
+ * Works like mtd_ooblayout_find_region() except it searches for a specific ECC
+ * byte.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+int mtd_ooblayout_find_eccregion(struct mtd_info *mtd, int eccbyte,
+				 int *section,
+				 struct mtd_oob_region *oobregion)
+{
+	return mtd_ooblayout_find_region(mtd, eccbyte, section, oobregion,
+					 mtd_ooblayout_ecc);
+}
+EXPORT_SYMBOL_GPL(mtd_ooblayout_find_eccregion);
+
+/**
+ * mtd_ooblayout_get_bytes - Extract OOB bytes from the oob buffer
+ * @mtd: mtd info structure
+ * @buf: destination buffer to store OOB bytes
+ * @oobbuf: OOB buffer
+ * @start: first byte to retrieve
+ * @nbytes: number of bytes to retrieve
+ * @iter: section iterator
+ *
+ * Extract bytes attached to a specific category (ECC or free)
+ * from the OOB buffer and copy them into buf.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+static int mtd_ooblayout_get_bytes(struct mtd_info *mtd, u8 *buf,
+				const u8 *oobbuf, int start, int nbytes,
+				int (*iter)(struct mtd_info *,
+					    int section,
+					    struct mtd_oob_region *oobregion))
+{
+	struct mtd_oob_region oobregion = { };
+	int section = 0, ret;
+
+	ret = mtd_ooblayout_find_region(mtd, start, &section,
+					&oobregion, iter);
+
+	while (!ret) {
+		int cnt;
+
+		cnt = oobregion.length > nbytes ? nbytes : oobregion.length;
+		memcpy(buf, oobbuf + oobregion.offset, cnt);
+		buf += cnt;
+		nbytes -= cnt;
+
+		if (!nbytes)
+			break;
+
+		ret = iter(mtd, ++section, &oobregion);
+	}
+
+	return ret;
+}
+
+/**
+ * mtd_ooblayout_set_bytes - put OOB bytes into the oob buffer
+ * @mtd: mtd info structure
+ * @buf: source buffer to get OOB bytes from
+ * @oobbuf: OOB buffer
+ * @start: first OOB byte to set
+ * @nbytes: number of OOB bytes to set
+ * @iter: section iterator
+ *
+ * Fill the OOB buffer with data provided in buf. The category (ECC or free)
+ * is selected by passing the appropriate iterator.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+static int mtd_ooblayout_set_bytes(struct mtd_info *mtd, const u8 *buf,
+				u8 *oobbuf, int start, int nbytes,
+				int (*iter)(struct mtd_info *,
+					    int section,
+					    struct mtd_oob_region *oobregion))
+{
+	struct mtd_oob_region oobregion = { };
+	int section = 0, ret;
+
+	ret = mtd_ooblayout_find_region(mtd, start, &section,
+					&oobregion, iter);
+
+	while (!ret) {
+		int cnt;
+
+		cnt = oobregion.length > nbytes ? nbytes : oobregion.length;
+		memcpy(oobbuf + oobregion.offset, buf, cnt);
+		buf += cnt;
+		nbytes -= cnt;
+
+		if (!nbytes)
+			break;
+
+		ret = iter(mtd, ++section, &oobregion);
+	}
+
+	return ret;
+}
+
+/**
+ * mtd_ooblayout_count_bytes - count the number of bytes in a OOB category
+ * @mtd: mtd info structure
+ * @iter: category iterator
+ *
+ * Count the number of bytes in a given category.
+ *
+ * Returns a positive value on success, a negative error code otherwise.
+ */
+static int mtd_ooblayout_count_bytes(struct mtd_info *mtd,
+				int (*iter)(struct mtd_info *,
+					    int section,
+					    struct mtd_oob_region *oobregion))
+{
+	struct mtd_oob_region oobregion = { };
+	int section = 0, ret, nbytes = 0;
+
+	while (1) {
+		ret = iter(mtd, section++, &oobregion);
+		if (ret) {
+			if (ret == -ERANGE)
+				ret = nbytes;
+			break;
+		}
+
+		nbytes += oobregion.length;
+	}
+
+	return ret;
+}
+
+/**
+ * mtd_ooblayout_get_eccbytes - extract ECC bytes from the oob buffer
+ * @mtd: mtd info structure
+ * @eccbuf: destination buffer to store ECC bytes
+ * @oobbuf: OOB buffer
+ * @start: first ECC byte to retrieve
+ * @nbytes: number of ECC bytes to retrieve
+ *
+ * Works like mtd_ooblayout_get_bytes(), except it acts on ECC bytes.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+int mtd_ooblayout_get_eccbytes(struct mtd_info *mtd, u8 *eccbuf,
+			       const u8 *oobbuf, int start, int nbytes)
+{
+	return mtd_ooblayout_get_bytes(mtd, eccbuf, oobbuf, start, nbytes,
+				       mtd_ooblayout_ecc);
+}
+EXPORT_SYMBOL_GPL(mtd_ooblayout_get_eccbytes);
+
+/**
+ * mtd_ooblayout_set_eccbytes - set ECC bytes into the oob buffer
+ * @mtd: mtd info structure
+ * @eccbuf: source buffer to get ECC bytes from
+ * @oobbuf: OOB buffer
+ * @start: first ECC byte to set
+ * @nbytes: number of ECC bytes to set
+ *
+ * Works like mtd_ooblayout_set_bytes(), except it acts on ECC bytes.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+int mtd_ooblayout_set_eccbytes(struct mtd_info *mtd, const u8 *eccbuf,
+			       u8 *oobbuf, int start, int nbytes)
+{
+	return mtd_ooblayout_set_bytes(mtd, eccbuf, oobbuf, start, nbytes,
+				       mtd_ooblayout_ecc);
+}
+EXPORT_SYMBOL_GPL(mtd_ooblayout_set_eccbytes);
+
+/**
+ * mtd_ooblayout_get_databytes - extract data bytes from the oob buffer
+ * @mtd: mtd info structure
+ * @databuf: destination buffer to store ECC bytes
+ * @oobbuf: OOB buffer
+ * @start: first ECC byte to retrieve
+ * @nbytes: number of ECC bytes to retrieve
+ *
+ * Works like mtd_ooblayout_get_bytes(), except it acts on free bytes.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+int mtd_ooblayout_get_databytes(struct mtd_info *mtd, u8 *databuf,
+				const u8 *oobbuf, int start, int nbytes)
+{
+	return mtd_ooblayout_get_bytes(mtd, databuf, oobbuf, start, nbytes,
+				       mtd_ooblayout_free);
+}
+EXPORT_SYMBOL_GPL(mtd_ooblayout_get_databytes);
+
+/**
+ * mtd_ooblayout_get_eccbytes - set data bytes into the oob buffer
+ * @mtd: mtd info structure
+ * @eccbuf: source buffer to get data bytes from
+ * @oobbuf: OOB buffer
+ * @start: first ECC byte to set
+ * @nbytes: number of ECC bytes to set
+ *
+ * Works like mtd_ooblayout_get_bytes(), except it acts on free bytes.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+int mtd_ooblayout_set_databytes(struct mtd_info *mtd, const u8 *databuf,
+				u8 *oobbuf, int start, int nbytes)
+{
+	return mtd_ooblayout_set_bytes(mtd, databuf, oobbuf, start, nbytes,
+				       mtd_ooblayout_free);
+}
+EXPORT_SYMBOL_GPL(mtd_ooblayout_set_databytes);
+
+/**
+ * mtd_ooblayout_count_freebytes - count the number of free bytes in OOB
+ * @mtd: mtd info structure
+ *
+ * Works like mtd_ooblayout_count_bytes(), except it count free bytes.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+int mtd_ooblayout_count_freebytes(struct mtd_info *mtd)
+{
+	return mtd_ooblayout_count_bytes(mtd, mtd_ooblayout_free);
+}
+EXPORT_SYMBOL_GPL(mtd_ooblayout_count_freebytes);
+
+/**
+ * mtd_ooblayout_count_freebytes - count the number of ECC bytes in OOB
+ * @mtd: mtd info structure
+ *
+ * Works like mtd_ooblayout_count_bytes(), except it count ECC bytes.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd)
+{
+	return mtd_ooblayout_count_bytes(mtd, mtd_ooblayout_ecc);
+}
+EXPORT_SYMBOL_GPL(mtd_ooblayout_count_eccbytes);
+
 /*
  * Method to access the protection register area, present in some flash
  * devices. The user data is one time programmable but the factory data is read
diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index 7712721..b141f26 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -108,6 +108,21 @@ struct nand_ecclayout {
 	struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES_LARGE];
 };
 
+/**
+ * struct mtd_oob_region - oob region definition
+ * @offset: region offset
+ * @length: region length
+ *
+ * This structure describes a region of the OOB area, and is used
+ * to retrieve ECC or free bytes sections.
+ * Each section is defined by an offset within the OOB area and a
+ * length.
+ */
+struct mtd_oob_region {
+	u32 offset;
+	u32 length;
+};
+
 struct module;	/* only needed for owner field in mtd_info */
 
 struct mtd_info {
@@ -253,6 +268,24 @@ struct mtd_info {
 	int usecount;
 };
 
+int mtd_ooblayout_ecc(struct mtd_info *mtd, int section,
+		      struct mtd_oob_region *oobecc);
+int mtd_ooblayout_find_eccregion(struct mtd_info *mtd, int eccbyte,
+				 int *section,
+				 struct mtd_oob_region *oobregion);
+int mtd_ooblayout_get_eccbytes(struct mtd_info *mtd, u8 *eccbuf,
+			       const u8 *oobbuf, int start, int nbytes);
+int mtd_ooblayout_set_eccbytes(struct mtd_info *mtd, const u8 *eccbuf,
+			       u8 *oobbuf, int start, int nbytes);
+int mtd_ooblayout_free(struct mtd_info *mtd, int section,
+		       struct mtd_oob_region *oobfree);
+int mtd_ooblayout_get_databytes(struct mtd_info *mtd, u8 *databuf,
+				const u8 *oobbuf, int start, int nbytes);
+int mtd_ooblayout_set_databytes(struct mtd_info *mtd, const u8 *databuf,
+				u8 *oobbuf, int start, int nbytes);
+int mtd_ooblayout_count_freebytes(struct mtd_info *mtd);
+int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd);
+
 static inline void mtd_set_of_node(struct mtd_info *mtd,
 				   struct device_node *np)
 {
-- 
2.5.0

[PATCH v5 01/50] mtd: add mtd_ooblayout_xxx() helper functions

[Boris Brezillon]

In order to make the ecclayout definition completely dynamic we need to
rework the way the OOB layout are defined and iterated.

Create a few mtd_ooblayout_xxx() helpers to ease OOB bytes manipulation
and hide ecclayout internals to their users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/mtdcore.c   | 400 ++++++++++++++++++++++++++++++++++++++++++++++++
 include/linux/mtd/mtd.h |  33 ++++
 2 files changed, 433 insertions(+)

diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index 3096251..9fc278a 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -997,6 +997,406 @@ int mtd_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops)
 }
 EXPORT_SYMBOL_GPL(mtd_read_oob);
 
+/**
+ * mtd_ooblayout_ecc - Get the OOB region definition of a specific ECC section
+ * @mtd: MTD device structure
+ * @section: ECC section. Depending on the layout you may have all the ECC
+ *	     bytes stored in a single contiguous section, or one section
+ *	     per ECC chunk (and sometime several sections for a single ECC
+ *	     ECC chunk)
+ * @oobecc: OOB region struct filled with the appropriate ECC position
+ *	    information
+ *
+ * This functions return ECC section information in the OOB area. I you want
+ * to get all the ECC bytes information, then you should call
+ * mtd_ooblayout_ecc(mtd, section++, oobecc) until it returns -ERANGE.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+int mtd_ooblayout_ecc(struct mtd_info *mtd, int section,
+		      struct mtd_oob_region *oobecc)
+{
+	int eccbyte = 0, cursection = 0, length = 0, eccpos = 0;
+
+	memset(oobecc, 0, sizeof(*oobecc));
+
+	if (!mtd || section < 0)
+		return -EINVAL;
+
+	if (!mtd->ecclayout)
+		return -ENOTSUPP;
+
+	/*
+	 * This logic allows us to reuse the ->ecclayout information and
+	 * expose them as ECC regions (as done for the OOB free regions).
+	 *
+	 * TODO: this should be dropped as soon as we get rid of the
+	 * ->ecclayout field.
+	 */
+	for (eccbyte = 0; eccbyte < mtd->ecclayout->eccbytes; eccbyte++) {
+		eccpos = mtd->ecclayout->eccpos[eccbyte];
+
+		if (eccbyte < mtd->ecclayout->eccbytes - 1) {
+			int neccpos = mtd->ecclayout->eccpos[eccbyte + 1];
+
+			if (eccpos + 1 == neccpos) {
+				length++;
+				continue;
+			}
+		}
+
+		if (section == cursection)
+			break;
+
+		length = 0;
+		cursection++;
+	}
+
+	if (cursection != section || eccbyte >= mtd->ecclayout->eccbytes)
+		return -ERANGE;
+
+	oobecc->length = length + 1;
+	oobecc->offset = eccpos - length;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(mtd_ooblayout_ecc);
+
+/**
+ * mtd_ooblayout_free - Get the OOB region definition of a specific free
+ *			section
+ * @mtd: MTD device structure
+ * @section: Free section you are interested in. Depending on the layout
+ *	     you may have all the free bytes stored in a single contiguous
+ *	     section, or one section per ECC chunk plus an extra section
+ *	     for the remaining bytes (or other funky layout).
+ * @oobfree: OOB region struct filled with the appropriate free position
+ *	     information
+ *
+ * This functions return free bytes position in the OOB area. I you want
+ * to get all the free bytes information, then you should call
+ * mtd_ooblayout_free(mtd, section++, oobfree) until it returns -ERANGE.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+int mtd_ooblayout_free(struct mtd_info *mtd, int section,
+		       struct mtd_oob_region *oobfree)
+{
+	memset(oobfree, 0, sizeof(*oobfree));
+
+	if (!mtd || section < 0)
+		return -EINVAL;
+
+	if (!mtd->ecclayout)
+		return -ENOTSUPP;
+
+	if (section >= MTD_MAX_OOBFREE_ENTRIES_LARGE)
+		return -ERANGE;
+
+	oobfree->offset = mtd->ecclayout->oobfree[section].offset;
+	oobfree->length = mtd->ecclayout->oobfree[section].length;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(mtd_ooblayout_free);
+
+/**
+ * mtd_ooblayout_find_region - Find the region attached to a specific byte
+ * @mtd: mtd info structure
+ * @byte: the byte we are searching for
+ * @sectionp: pointer where the section id will be stored
+ * @oobregion: used to retrieve the ECC position
+ * @iter: iterator function. Should be either mtd_ooblayout_free or
+ *	  mtd_ooblayout_ecc depending on the region type you're searching for
+ *
+ * This functions returns the section id and oobregion information of a
+ * specific byte. For example, say you want to know where the 4th ECC byte is
+ * stored, you'll use:
+ *
+ * mtd_ooblayout_find_region(mtd, 3, &section, &oobregion, mtd_ooblayout_ecc);
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+static int mtd_ooblayout_find_region(struct mtd_info *mtd, int byte,
+				int *sectionp, struct mtd_oob_region *oobregion,
+				int (*iter)(struct mtd_info *,
+					    int section,
+					    struct mtd_oob_region *oobregion))
+{
+	int pos = 0, ret, section = 0;
+
+	memset(oobregion, 0, sizeof(*oobregion));
+
+	while (1) {
+		ret = iter(mtd, section, oobregion);
+		if (ret)
+			return ret;
+
+		if (pos + oobregion->length > byte)
+			break;
+
+		pos += oobregion->length;
+		section++;
+	}
+
+	/*
+	 * Adjust region info to make it start at the beginning at the
+	 * 'start' ECC byte.
+	 */
+	oobregion->offset += byte - pos;
+	oobregion->length -= byte - pos;
+	*sectionp = section;
+
+	return 0;
+}
+
+/**
+ * mtd_ooblayout_find_eccregion - Find the ECC region attached to a specific
+ *				  ECC byte
+ * @mtd: mtd info structure
+ * @eccbyte: the byte we are searching for
+ * @sectionp: pointer where the section id will be stored
+ * @oobregion: OOB region information
+ *
+ * Works like mtd_ooblayout_find_region() except it searches for a specific ECC
+ * byte.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+int mtd_ooblayout_find_eccregion(struct mtd_info *mtd, int eccbyte,
+				 int *section,
+				 struct mtd_oob_region *oobregion)
+{
+	return mtd_ooblayout_find_region(mtd, eccbyte, section, oobregion,
+					 mtd_ooblayout_ecc);
+}
+EXPORT_SYMBOL_GPL(mtd_ooblayout_find_eccregion);
+
+/**
+ * mtd_ooblayout_get_bytes - Extract OOB bytes from the oob buffer
+ * @mtd: mtd info structure
+ * @buf: destination buffer to store OOB bytes
+ * @oobbuf: OOB buffer
+ * @start: first byte to retrieve
+ * @nbytes: number of bytes to retrieve
+ * @iter: section iterator
+ *
+ * Extract bytes attached to a specific category (ECC or free)
+ * from the OOB buffer and copy them into buf.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+static int mtd_ooblayout_get_bytes(struct mtd_info *mtd, u8 *buf,
+				const u8 *oobbuf, int start, int nbytes,
+				int (*iter)(struct mtd_info *,
+					    int section,
+					    struct mtd_oob_region *oobregion))
+{
+	struct mtd_oob_region oobregion = { };
+	int section = 0, ret;
+
+	ret = mtd_ooblayout_find_region(mtd, start, &section,
+					&oobregion, iter);
+
+	while (!ret) {
+		int cnt;
+
+		cnt = oobregion.length > nbytes ? nbytes : oobregion.length;
+		memcpy(buf, oobbuf + oobregion.offset, cnt);
+		buf += cnt;
+		nbytes -= cnt;
+
+		if (!nbytes)
+			break;
+
+		ret = iter(mtd, ++section, &oobregion);
+	}
+
+	return ret;
+}
+
+/**
+ * mtd_ooblayout_set_bytes - put OOB bytes into the oob buffer
+ * @mtd: mtd info structure
+ * @buf: source buffer to get OOB bytes from
+ * @oobbuf: OOB buffer
+ * @start: first OOB byte to set
+ * @nbytes: number of OOB bytes to set
+ * @iter: section iterator
+ *
+ * Fill the OOB buffer with data provided in buf. The category (ECC or free)
+ * is selected by passing the appropriate iterator.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+static int mtd_ooblayout_set_bytes(struct mtd_info *mtd, const u8 *buf,
+				u8 *oobbuf, int start, int nbytes,
+				int (*iter)(struct mtd_info *,
+					    int section,
+					    struct mtd_oob_region *oobregion))
+{
+	struct mtd_oob_region oobregion = { };
+	int section = 0, ret;
+
+	ret = mtd_ooblayout_find_region(mtd, start, &section,
+					&oobregion, iter);
+
+	while (!ret) {
+		int cnt;
+
+		cnt = oobregion.length > nbytes ? nbytes : oobregion.length;
+		memcpy(oobbuf + oobregion.offset, buf, cnt);
+		buf += cnt;
+		nbytes -= cnt;
+
+		if (!nbytes)
+			break;
+
+		ret = iter(mtd, ++section, &oobregion);
+	}
+
+	return ret;
+}
+
+/**
+ * mtd_ooblayout_count_bytes - count the number of bytes in a OOB category
+ * @mtd: mtd info structure
+ * @iter: category iterator
+ *
+ * Count the number of bytes in a given category.
+ *
+ * Returns a positive value on success, a negative error code otherwise.
+ */
+static int mtd_ooblayout_count_bytes(struct mtd_info *mtd,
+				int (*iter)(struct mtd_info *,
+					    int section,
+					    struct mtd_oob_region *oobregion))
+{
+	struct mtd_oob_region oobregion = { };
+	int section = 0, ret, nbytes = 0;
+
+	while (1) {
+		ret = iter(mtd, section++, &oobregion);
+		if (ret) {
+			if (ret == -ERANGE)
+				ret = nbytes;
+			break;
+		}
+
+		nbytes += oobregion.length;
+	}
+
+	return ret;
+}
+
+/**
+ * mtd_ooblayout_get_eccbytes - extract ECC bytes from the oob buffer
+ * @mtd: mtd info structure
+ * @eccbuf: destination buffer to store ECC bytes
+ * @oobbuf: OOB buffer
+ * @start: first ECC byte to retrieve
+ * @nbytes: number of ECC bytes to retrieve
+ *
+ * Works like mtd_ooblayout_get_bytes(), except it acts on ECC bytes.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+int mtd_ooblayout_get_eccbytes(struct mtd_info *mtd, u8 *eccbuf,
+			       const u8 *oobbuf, int start, int nbytes)
+{
+	return mtd_ooblayout_get_bytes(mtd, eccbuf, oobbuf, start, nbytes,
+				       mtd_ooblayout_ecc);
+}
+EXPORT_SYMBOL_GPL(mtd_ooblayout_get_eccbytes);
+
+/**
+ * mtd_ooblayout_set_eccbytes - set ECC bytes into the oob buffer
+ * @mtd: mtd info structure
+ * @eccbuf: source buffer to get ECC bytes from
+ * @oobbuf: OOB buffer
+ * @start: first ECC byte to set
+ * @nbytes: number of ECC bytes to set
+ *
+ * Works like mtd_ooblayout_set_bytes(), except it acts on ECC bytes.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+int mtd_ooblayout_set_eccbytes(struct mtd_info *mtd, const u8 *eccbuf,
+			       u8 *oobbuf, int start, int nbytes)
+{
+	return mtd_ooblayout_set_bytes(mtd, eccbuf, oobbuf, start, nbytes,
+				       mtd_ooblayout_ecc);
+}
+EXPORT_SYMBOL_GPL(mtd_ooblayout_set_eccbytes);
+
+/**
+ * mtd_ooblayout_get_databytes - extract data bytes from the oob buffer
+ * @mtd: mtd info structure
+ * @databuf: destination buffer to store ECC bytes
+ * @oobbuf: OOB buffer
+ * @start: first ECC byte to retrieve
+ * @nbytes: number of ECC bytes to retrieve
+ *
+ * Works like mtd_ooblayout_get_bytes(), except it acts on free bytes.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+int mtd_ooblayout_get_databytes(struct mtd_info *mtd, u8 *databuf,
+				const u8 *oobbuf, int start, int nbytes)
+{
+	return mtd_ooblayout_get_bytes(mtd, databuf, oobbuf, start, nbytes,
+				       mtd_ooblayout_free);
+}
+EXPORT_SYMBOL_GPL(mtd_ooblayout_get_databytes);
+
+/**
+ * mtd_ooblayout_get_eccbytes - set data bytes into the oob buffer
+ * @mtd: mtd info structure
+ * @eccbuf: source buffer to get data bytes from
+ * @oobbuf: OOB buffer
+ * @start: first ECC byte to set
+ * @nbytes: number of ECC bytes to set
+ *
+ * Works like mtd_ooblayout_get_bytes(), except it acts on free bytes.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+int mtd_ooblayout_set_databytes(struct mtd_info *mtd, const u8 *databuf,
+				u8 *oobbuf, int start, int nbytes)
+{
+	return mtd_ooblayout_set_bytes(mtd, databuf, oobbuf, start, nbytes,
+				       mtd_ooblayout_free);
+}
+EXPORT_SYMBOL_GPL(mtd_ooblayout_set_databytes);
+
+/**
+ * mtd_ooblayout_count_freebytes - count the number of free bytes in OOB
+ * @mtd: mtd info structure
+ *
+ * Works like mtd_ooblayout_count_bytes(), except it count free bytes.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+int mtd_ooblayout_count_freebytes(struct mtd_info *mtd)
+{
+	return mtd_ooblayout_count_bytes(mtd, mtd_ooblayout_free);
+}
+EXPORT_SYMBOL_GPL(mtd_ooblayout_count_freebytes);
+
+/**
+ * mtd_ooblayout_count_freebytes - count the number of ECC bytes in OOB
+ * @mtd: mtd info structure
+ *
+ * Works like mtd_ooblayout_count_bytes(), except it count ECC bytes.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd)
+{
+	return mtd_ooblayout_count_bytes(mtd, mtd_ooblayout_ecc);
+}
+EXPORT_SYMBOL_GPL(mtd_ooblayout_count_eccbytes);
+
 /*
  * Method to access the protection register area, present in some flash
  * devices. The user data is one time programmable but the factory data is read
diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index 7712721..b141f26 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -108,6 +108,21 @@ struct nand_ecclayout {
 	struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES_LARGE];
 };
 
+/**
+ * struct mtd_oob_region - oob region definition
+ * @offset: region offset
+ * @length: region length
+ *
+ * This structure describes a region of the OOB area, and is used
+ * to retrieve ECC or free bytes sections.
+ * Each section is defined by an offset within the OOB area and a
+ * length.
+ */
+struct mtd_oob_region {
+	u32 offset;
+	u32 length;
+};
+
 struct module;	/* only needed for owner field in mtd_info */
 
 struct mtd_info {
@@ -253,6 +268,24 @@ struct mtd_info {
 	int usecount;
 };
 
+int mtd_ooblayout_ecc(struct mtd_info *mtd, int section,
+		      struct mtd_oob_region *oobecc);
+int mtd_ooblayout_find_eccregion(struct mtd_info *mtd, int eccbyte,
+				 int *section,
+				 struct mtd_oob_region *oobregion);
+int mtd_ooblayout_get_eccbytes(struct mtd_info *mtd, u8 *eccbuf,
+			       const u8 *oobbuf, int start, int nbytes);
+int mtd_ooblayout_set_eccbytes(struct mtd_info *mtd, const u8 *eccbuf,
+			       u8 *oobbuf, int start, int nbytes);
+int mtd_ooblayout_free(struct mtd_info *mtd, int section,
+		       struct mtd_oob_region *oobfree);
+int mtd_ooblayout_get_databytes(struct mtd_info *mtd, u8 *databuf,
+				const u8 *oobbuf, int start, int nbytes);
+int mtd_ooblayout_set_databytes(struct mtd_info *mtd, const u8 *databuf,
+				u8 *oobbuf, int start, int nbytes);
+int mtd_ooblayout_count_freebytes(struct mtd_info *mtd);
+int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd);
+
 static inline void mtd_set_of_node(struct mtd_info *mtd,
 				   struct device_node *np)
 {
-- 
2.5.0

[PATCH v5 02/50] mtd: use mtd_ooblayout_xxx() helpers where appropriate

[Boris Brezillon]

The mtd_ooblayout_xxx() helper functions have been added to avoid direct
accesses to the ecclayout field, and thus ease for future reworks.
Use these helpers in all places where the oobfree[] and eccpos[] arrays
where directly accessed.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/mtdchar.c | 107 +++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 88 insertions(+), 19 deletions(-)

diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index 6d19835..cd64ab7 100644
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -472,28 +472,101 @@ static int mtdchar_readoob(struct file *file, struct mtd_info *mtd,
  * nand_ecclayout flexibly (i.e. the struct may change size in new
  * releases without requiring major rewrites).
  */
-static int shrink_ecclayout(const struct nand_ecclayout *from,
-		struct nand_ecclayout_user *to)
+static int shrink_ecclayout(struct mtd_info *mtd,
+			    struct nand_ecclayout_user *to)
 {
-	int i;
+	struct mtd_oob_region oobregion;
+	int i, section = 0, ret;
 
-	if (!from || !to)
+	if (!mtd || !to)
 		return -EINVAL;
 
 	memset(to, 0, sizeof(*to));
 
-	to->eccbytes = min((int)from->eccbytes, MTD_MAX_ECCPOS_ENTRIES);
-	for (i = 0; i < to->eccbytes; i++)
-		to->eccpos[i] = from->eccpos[i];
+	to->eccbytes = 0;
+	for (i = 0; i < MTD_MAX_ECCPOS_ENTRIES;) {
+		u32 eccpos;
+
+		ret = mtd_ooblayout_ecc(mtd, section, &oobregion);
+		if (ret < 0) {
+			if (ret != -ERANGE)
+				return ret;
+
+			break;
+		}
+
+		eccpos = oobregion.offset;
+		for (; i < MTD_MAX_ECCPOS_ENTRIES &&
+		       eccpos < oobregion.offset + oobregion.length; i++) {
+			to->eccpos[i] = eccpos++;
+			to->eccbytes++;
+		}
+	}
 
 	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) {
-		if (from->oobfree[i].length == 0 &&
-				from->oobfree[i].offset == 0)
+		ret = mtd_ooblayout_free(mtd, i, &oobregion);
+		if (ret < 0) {
+			if (ret != -ERANGE)
+				return ret;
+
+			break;
+		}
+
+		to->oobfree[i].offset = oobregion.offset;
+		to->oobfree[i].length = oobregion.length;
+		to->oobavail += to->oobfree[i].length;
+	}
+
+	return 0;
+}
+
+static int get_oobinfo(struct mtd_info *mtd, struct nand_oobinfo *to)
+{
+	struct mtd_oob_region oobregion;
+	int i, section = 0, ret;
+
+	if (!mtd || !to)
+		return -EINVAL;
+
+	memset(to, 0, sizeof(*to));
+
+	to->eccbytes = 0;
+	for (i = 0; i < ARRAY_SIZE(to->eccpos);) {
+		u32 eccpos;
+
+		ret = mtd_ooblayout_ecc(mtd, section, &oobregion);
+		if (ret < 0) {
+			if (ret != -ERANGE)
+				return ret;
+
 			break;
-		to->oobavail += from->oobfree[i].length;
-		to->oobfree[i] = from->oobfree[i];
+		}
+
+		if (oobregion.length + i > ARRAY_SIZE(to->eccpos))
+			return -EINVAL;
+
+		eccpos = oobregion.offset;
+		for (; eccpos < oobregion.offset + oobregion.length; i++) {
+			to->eccpos[i] = eccpos++;
+			to->eccbytes++;
+		}
 	}
 
+	for (i = 0; i < 8; i++) {
+		ret = mtd_ooblayout_free(mtd, i, &oobregion);
+		if (ret < 0) {
+			if (ret != -ERANGE)
+				return ret;
+
+			break;
+		}
+
+		to->oobfree[i][0] = oobregion.offset;
+		to->oobfree[i][1] = oobregion.length;
+	}
+
+	to->useecc = MTD_NANDECC_AUTOPLACE;
+
 	return 0;
 }
 
@@ -817,14 +890,10 @@ static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
 
 		if (!mtd->ecclayout)
 			return -EOPNOTSUPP;
-		if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos))
-			return -EINVAL;
 
-		oi.useecc = MTD_NANDECC_AUTOPLACE;
-		memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos));
-		memcpy(&oi.oobfree, mtd->ecclayout->oobfree,
-		       sizeof(oi.oobfree));
-		oi.eccbytes = mtd->ecclayout->eccbytes;
+		ret = get_oobinfo(mtd, &oi);
+		if (ret)
+			return ret;
 
 		if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
 			return -EFAULT;
@@ -920,7 +989,7 @@ static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
 		if (!usrlay)
 			return -ENOMEM;
 
-		shrink_ecclayout(mtd->ecclayout, usrlay);
+		shrink_ecclayout(mtd, usrlay);
 
 		if (copy_to_user(argp, usrlay, sizeof(*usrlay)))
 			ret = -EFAULT;
-- 
2.5.0

[PATCH v5 02/50] mtd: use mtd_ooblayout_xxx() helpers where appropriate

[Boris Brezillon]

The mtd_ooblayout_xxx() helper functions have been added to avoid direct
accesses to the ecclayout field, and thus ease for future reworks.
Use these helpers in all places where the oobfree[] and eccpos[] arrays
where directly accessed.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/mtd/mtdchar.c | 107 +++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 88 insertions(+), 19 deletions(-)

diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index 6d19835..cd64ab7 100644
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -472,28 +472,101 @@ static int mtdchar_readoob(struct file *file, struct mtd_info *mtd,
  * nand_ecclayout flexibly (i.e. the struct may change size in new
  * releases without requiring major rewrites).
  */
-static int shrink_ecclayout(const struct nand_ecclayout *from,
-		struct nand_ecclayout_user *to)
+static int shrink_ecclayout(struct mtd_info *mtd,
+			    struct nand_ecclayout_user *to)
 {
-	int i;
+	struct mtd_oob_region oobregion;
+	int i, section = 0, ret;
 
-	if (!from || !to)
+	if (!mtd || !to)
 		return -EINVAL;
 
 	memset(to, 0, sizeof(*to));
 
-	to->eccbytes = min((int)from->eccbytes, MTD_MAX_ECCPOS_ENTRIES);
-	for (i = 0; i < to->eccbytes; i++)
-		to->eccpos[i] = from->eccpos[i];
+	to->eccbytes = 0;
+	for (i = 0; i < MTD_MAX_ECCPOS_ENTRIES;) {
+		u32 eccpos;
+
+		ret = mtd_ooblayout_ecc(mtd, section, &oobregion);
+		if (ret < 0) {
+			if (ret != -ERANGE)
+				return ret;
+
+			break;
+		}
+
+		eccpos = oobregion.offset;
+		for (; i < MTD_MAX_ECCPOS_ENTRIES &&
+		       eccpos < oobregion.offset + oobregion.length; i++) {
+			to->eccpos[i] = eccpos++;
+			to->eccbytes++;
+		}
+	}
 
 	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) {
-		if (from->oobfree[i].length == 0 &&
-				from->oobfree[i].offset == 0)
+		ret = mtd_ooblayout_free(mtd, i, &oobregion);
+		if (ret < 0) {
+			if (ret != -ERANGE)
+				return ret;
+
+			break;
+		}
+
+		to->oobfree[i].offset = oobregion.offset;
+		to->oobfree[i].length = oobregion.length;
+		to->oobavail += to->oobfree[i].length;
+	}
+
+	return 0;
+}
+
+static int get_oobinfo(struct mtd_info *mtd, struct nand_oobinfo *to)
+{
+	struct mtd_oob_region oobregion;
+	int i, section = 0, ret;
+
+	if (!mtd || !to)
+		return -EINVAL;
+
+	memset(to, 0, sizeof(*to));
+
+	to->eccbytes = 0;
+	for (i = 0; i < ARRAY_SIZE(to->eccpos);) {
+		u32 eccpos;
+
+		ret = mtd_ooblayout_ecc(mtd, section, &oobregion);
+		if (ret < 0) {
+			if (ret != -ERANGE)
+				return ret;
+
 			break;
-		to->oobavail += from->oobfree[i].length;
-		to->oobfree[i] = from->oobfree[i];
+		}
+
+		if (oobregion.length + i > ARRAY_SIZE(to->eccpos))
+			return -EINVAL;
+
+		eccpos = oobregion.offset;
+		for (; eccpos < oobregion.offset + oobregion.length; i++) {
+			to->eccpos[i] = eccpos++;
+			to->eccbytes++;
+		}
 	}
 
+	for (i = 0; i < 8; i++) {
+		ret = mtd_ooblayout_free(mtd, i, &oobregion);
+		if (ret < 0) {
+			if (ret != -ERANGE)
+				return ret;
+
+			break;
+		}
+
+		to->oobfree[i][0] = oobregion.offset;
+		to->oobfree[i][1] = oobregion.length;
+	}
+
+	to->useecc = MTD_NANDECC_AUTOPLACE;
+
 	return 0;
 }
 
@@ -817,14 +890,10 @@ static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
 
 		if (!mtd->ecclayout)
 			return -EOPNOTSUPP;
-		if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos))
-			return -EINVAL;
 
-		oi.useecc = MTD_NANDECC_AUTOPLACE;
-		memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos));
-		memcpy(&oi.oobfree, mtd->ecclayout->oobfree,
-		       sizeof(oi.oobfree));
-		oi.eccbytes = mtd->ecclayout->eccbytes;
+		ret = get_oobinfo(mtd, &oi);
+		if (ret)
+			return ret;
 
 		if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
 			return -EFAULT;
@@ -920,7 +989,7 @@ static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
 		if (!usrlay)
 			return -ENOMEM;
 
-		shrink_ecclayout(mtd->ecclayout, usrlay);
+		shrink_ecclayout(mtd, usrlay);
 
 		if (copy_to_user(argp, usrlay, sizeof(*usrlay)))
 			ret = -EFAULT;
-- 
2.5.0

[PATCH v5 02/50] mtd: use mtd_ooblayout_xxx() helpers where appropriate

[Boris Brezillon]

The mtd_ooblayout_xxx() helper functions have been added to avoid direct
accesses to the ecclayout field, and thus ease for future reworks.
Use these helpers in all places where the oobfree[] and eccpos[] arrays
where directly accessed.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/mtdchar.c | 107 +++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 88 insertions(+), 19 deletions(-)

diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index 6d19835..cd64ab7 100644
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -472,28 +472,101 @@ static int mtdchar_readoob(struct file *file, struct mtd_info *mtd,
  * nand_ecclayout flexibly (i.e. the struct may change size in new
  * releases without requiring major rewrites).
  */
-static int shrink_ecclayout(const struct nand_ecclayout *from,
-		struct nand_ecclayout_user *to)
+static int shrink_ecclayout(struct mtd_info *mtd,
+			    struct nand_ecclayout_user *to)
 {
-	int i;
+	struct mtd_oob_region oobregion;
+	int i, section = 0, ret;
 
-	if (!from || !to)
+	if (!mtd || !to)
 		return -EINVAL;
 
 	memset(to, 0, sizeof(*to));
 
-	to->eccbytes = min((int)from->eccbytes, MTD_MAX_ECCPOS_ENTRIES);
-	for (i = 0; i < to->eccbytes; i++)
-		to->eccpos[i] = from->eccpos[i];
+	to->eccbytes = 0;
+	for (i = 0; i < MTD_MAX_ECCPOS_ENTRIES;) {
+		u32 eccpos;
+
+		ret = mtd_ooblayout_ecc(mtd, section, &oobregion);
+		if (ret < 0) {
+			if (ret != -ERANGE)
+				return ret;
+
+			break;
+		}
+
+		eccpos = oobregion.offset;
+		for (; i < MTD_MAX_ECCPOS_ENTRIES &&
+		       eccpos < oobregion.offset + oobregion.length; i++) {
+			to->eccpos[i] = eccpos++;
+			to->eccbytes++;
+		}
+	}
 
 	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) {
-		if (from->oobfree[i].length == 0 &&
-				from->oobfree[i].offset == 0)
+		ret = mtd_ooblayout_free(mtd, i, &oobregion);
+		if (ret < 0) {
+			if (ret != -ERANGE)
+				return ret;
+
+			break;
+		}
+
+		to->oobfree[i].offset = oobregion.offset;
+		to->oobfree[i].length = oobregion.length;
+		to->oobavail += to->oobfree[i].length;
+	}
+
+	return 0;
+}
+
+static int get_oobinfo(struct mtd_info *mtd, struct nand_oobinfo *to)
+{
+	struct mtd_oob_region oobregion;
+	int i, section = 0, ret;
+
+	if (!mtd || !to)
+		return -EINVAL;
+
+	memset(to, 0, sizeof(*to));
+
+	to->eccbytes = 0;
+	for (i = 0; i < ARRAY_SIZE(to->eccpos);) {
+		u32 eccpos;
+
+		ret = mtd_ooblayout_ecc(mtd, section, &oobregion);
+		if (ret < 0) {
+			if (ret != -ERANGE)
+				return ret;
+
 			break;
-		to->oobavail += from->oobfree[i].length;
-		to->oobfree[i] = from->oobfree[i];
+		}
+
+		if (oobregion.length + i > ARRAY_SIZE(to->eccpos))
+			return -EINVAL;
+
+		eccpos = oobregion.offset;
+		for (; eccpos < oobregion.offset + oobregion.length; i++) {
+			to->eccpos[i] = eccpos++;
+			to->eccbytes++;
+		}
 	}
 
+	for (i = 0; i < 8; i++) {
+		ret = mtd_ooblayout_free(mtd, i, &oobregion);
+		if (ret < 0) {
+			if (ret != -ERANGE)
+				return ret;
+
+			break;
+		}
+
+		to->oobfree[i][0] = oobregion.offset;
+		to->oobfree[i][1] = oobregion.length;
+	}
+
+	to->useecc = MTD_NANDECC_AUTOPLACE;
+
 	return 0;
 }
 
@@ -817,14 +890,10 @@ static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
 
 		if (!mtd->ecclayout)
 			return -EOPNOTSUPP;
-		if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos))
-			return -EINVAL;
 
-		oi.useecc = MTD_NANDECC_AUTOPLACE;
-		memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos));
-		memcpy(&oi.oobfree, mtd->ecclayout->oobfree,
-		       sizeof(oi.oobfree));
-		oi.eccbytes = mtd->ecclayout->eccbytes;
+		ret = get_oobinfo(mtd, &oi);
+		if (ret)
+			return ret;
 
 		if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
 			return -EFAULT;
@@ -920,7 +989,7 @@ static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
 		if (!usrlay)
 			return -ENOMEM;
 
-		shrink_ecclayout(mtd->ecclayout, usrlay);
+		shrink_ecclayout(mtd, usrlay);
 
 		if (copy_to_user(argp, usrlay, sizeof(*usrlay)))
 			ret = -EFAULT;
-- 
2.5.0

[PATCH v5 03/50] mtd: nand: core: use mtd_ooblayout_xxx() helpers where appropriate

[Boris Brezillon]

The mtd_ooblayout_xxx() helper functions have been added to avoid direct
accesses to the ecclayout field, and thus ease for future reworks.
Use these helpers in all places where the oobfree[] and eccpos[] arrays
where directly accessed.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/nand_base.c | 201 +++++++++++++++++++------------------------
 drivers/mtd/nand/nand_bch.c  |   3 +-
 2 files changed, 91 insertions(+), 113 deletions(-)

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index c3733a1..36a58a0 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -1292,13 +1292,12 @@ static int nand_read_page_raw_syndrome(struct mtd_info *mtd,
 static int nand_read_page_swecc(struct mtd_info *mtd, struct nand_chip *chip,
 				uint8_t *buf, int oob_required, int page)
 {
-	int i, eccsize = chip->ecc.size;
+	int i, eccsize = chip->ecc.size, ret;
 	int eccbytes = chip->ecc.bytes;
 	int eccsteps = chip->ecc.steps;
 	uint8_t *p = buf;
 	uint8_t *ecc_calc = chip->buffers->ecccalc;
 	uint8_t *ecc_code = chip->buffers->ecccode;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
 	unsigned int max_bitflips = 0;
 
 	chip->ecc.read_page_raw(mtd, chip, buf, 1, page);
@@ -1306,8 +1305,10 @@ static int nand_read_page_swecc(struct mtd_info *mtd, struct nand_chip *chip,
 	for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize)
 		chip->ecc.calculate(mtd, p, &ecc_calc[i]);
 
-	for (i = 0; i < chip->ecc.total; i++)
-		ecc_code[i] = chip->oob_poi[eccpos[i]];
+	ret = mtd_ooblayout_get_eccbytes(mtd, ecc_code, chip->oob_poi, 0,
+					 chip->ecc.total);
+	if (ret)
+		return ret;
 
 	eccsteps = chip->ecc.steps;
 	p = buf;
@@ -1339,14 +1340,14 @@ static int nand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
 			uint32_t data_offs, uint32_t readlen, uint8_t *bufpoi,
 			int page)
 {
-	int start_step, end_step, num_steps;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
+	int start_step, end_step, num_steps, ret;
 	uint8_t *p;
 	int data_col_addr, i, gaps = 0;
 	int datafrag_len, eccfrag_len, aligned_len, aligned_pos;
 	int busw = (chip->options & NAND_BUSWIDTH_16) ? 2 : 1;
-	int index;
+	int index, section = 0;
 	unsigned int max_bitflips = 0;
+	struct mtd_oob_region oobregion = { };
 
 	/* Column address within the page aligned to ECC size (256bytes) */
 	start_step = data_offs / chip->ecc.size;
@@ -1374,12 +1375,13 @@ static int nand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
 	 * The performance is faster if we position offsets according to
 	 * ecc.pos. Let's make sure that there are no gaps in ECC positions.
 	 */
-	for (i = 0; i < eccfrag_len - 1; i++) {
-		if (eccpos[i + index] + 1 != eccpos[i + index + 1]) {
-			gaps = 1;
-			break;
-		}
-	}
+	ret = mtd_ooblayout_find_eccregion(mtd, index, &section, &oobregion);
+	if (ret)
+		return ret;
+
+	if (oobregion.length < eccfrag_len)
+		gaps = 1;
+
 	if (gaps) {
 		chip->cmdfunc(mtd, NAND_CMD_RNDOUT, mtd->writesize, -1);
 		chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
@@ -1388,20 +1390,23 @@ static int nand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
 		 * Send the command to read the particular ECC bytes take care
 		 * about buswidth alignment in read_buf.
 		 */
-		aligned_pos = eccpos[index] & ~(busw - 1);
+		aligned_pos = oobregion.offset & ~(busw - 1);
 		aligned_len = eccfrag_len;
-		if (eccpos[index] & (busw - 1))
+		if (oobregion.offset & (busw - 1))
 			aligned_len++;
-		if (eccpos[index + (num_steps * chip->ecc.bytes)] & (busw - 1))
+		if ((oobregion.offset + (num_steps * chip->ecc.bytes)) &
+		    (busw - 1))
 			aligned_len++;
 
 		chip->cmdfunc(mtd, NAND_CMD_RNDOUT,
-					mtd->writesize + aligned_pos, -1);
+			      mtd->writesize + aligned_pos, -1);
 		chip->read_buf(mtd, &chip->oob_poi[aligned_pos], aligned_len);
 	}
 
-	for (i = 0; i < eccfrag_len; i++)
-		chip->buffers->ecccode[i] = chip->oob_poi[eccpos[i + index]];
+	ret = mtd_ooblayout_get_eccbytes(mtd, chip->buffers->ecccode,
+					 chip->oob_poi, index, eccfrag_len);
+	if (ret)
+		return ret;
 
 	p = bufpoi + data_col_addr;
 	for (i = 0; i < eccfrag_len ; i += chip->ecc.bytes, p += chip->ecc.size) {
@@ -1442,13 +1447,12 @@ static int nand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
 static int nand_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
 				uint8_t *buf, int oob_required, int page)
 {
-	int i, eccsize = chip->ecc.size;
+	int i, eccsize = chip->ecc.size, ret;
 	int eccbytes = chip->ecc.bytes;
 	int eccsteps = chip->ecc.steps;
 	uint8_t *p = buf;
 	uint8_t *ecc_calc = chip->buffers->ecccalc;
 	uint8_t *ecc_code = chip->buffers->ecccode;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
 	unsigned int max_bitflips = 0;
 
 	for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
@@ -1458,8 +1462,10 @@ static int nand_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
 	}
 	chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
 
-	for (i = 0; i < chip->ecc.total; i++)
-		ecc_code[i] = chip->oob_poi[eccpos[i]];
+	ret = mtd_ooblayout_get_eccbytes(mtd, ecc_code, chip->oob_poi, 0,
+					 chip->ecc.total);
+	if (ret)
+		return ret;
 
 	eccsteps = chip->ecc.steps;
 	p = buf;
@@ -1504,12 +1510,11 @@ static int nand_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
 static int nand_read_page_hwecc_oob_first(struct mtd_info *mtd,
 	struct nand_chip *chip, uint8_t *buf, int oob_required, int page)
 {
-	int i, eccsize = chip->ecc.size;
+	int i, eccsize = chip->ecc.size, ret;
 	int eccbytes = chip->ecc.bytes;
 	int eccsteps = chip->ecc.steps;
 	uint8_t *p = buf;
 	uint8_t *ecc_code = chip->buffers->ecccode;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
 	uint8_t *ecc_calc = chip->buffers->ecccalc;
 	unsigned int max_bitflips = 0;
 
@@ -1518,8 +1523,10 @@ static int nand_read_page_hwecc_oob_first(struct mtd_info *mtd,
 	chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
 	chip->cmdfunc(mtd, NAND_CMD_READ0, 0, page);
 
-	for (i = 0; i < chip->ecc.total; i++)
-		ecc_code[i] = chip->oob_poi[eccpos[i]];
+	ret = mtd_ooblayout_get_eccbytes(mtd, ecc_code, chip->oob_poi, 0,
+					 chip->ecc.total);
+	if (ret)
+		return ret;
 
 	for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
 		int stat;
@@ -1620,14 +1627,17 @@ static int nand_read_page_syndrome(struct mtd_info *mtd, struct nand_chip *chip,
 
 /**
  * nand_transfer_oob - [INTERN] Transfer oob to client buffer
- * @chip: nand chip structure
+ * @mtd: mtd info structure
  * @oob: oob destination address
  * @ops: oob ops structure
  * @len: size of oob to transfer
  */
-static uint8_t *nand_transfer_oob(struct nand_chip *chip, uint8_t *oob,
+static uint8_t *nand_transfer_oob(struct mtd_info *mtd, uint8_t *oob,
 				  struct mtd_oob_ops *ops, size_t len)
 {
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	int ret;
+
 	switch (ops->mode) {
 
 	case MTD_OPS_PLACE_OOB:
@@ -1635,31 +1645,12 @@ static uint8_t *nand_transfer_oob(struct nand_chip *chip, uint8_t *oob,
 		memcpy(oob, chip->oob_poi + ops->ooboffs, len);
 		return oob + len;
 
-	case MTD_OPS_AUTO_OOB: {
-		struct nand_oobfree *free = chip->ecc.layout->oobfree;
-		uint32_t boffs = 0, roffs = ops->ooboffs;
-		size_t bytes = 0;
-
-		for (; free->length && len; free++, len -= bytes) {
-			/* Read request not from offset 0? */
-			if (unlikely(roffs)) {
-				if (roffs >= free->length) {
-					roffs -= free->length;
-					continue;
-				}
-				boffs = free->offset + roffs;
-				bytes = min_t(size_t, len,
-					      (free->length - roffs));
-				roffs = 0;
-			} else {
-				bytes = min_t(size_t, len, free->length);
-				boffs = free->offset;
-			}
-			memcpy(oob, chip->oob_poi + boffs, bytes);
-			oob += bytes;
-		}
-		return oob;
-	}
+	case MTD_OPS_AUTO_OOB:
+		ret = mtd_ooblayout_get_databytes(mtd, oob, chip->oob_poi,
+						  ops->ooboffs, len);
+		BUG_ON(ret);
+		return oob + len;
+
 	default:
 		BUG();
 	}
@@ -1793,7 +1784,7 @@ read_retry:
 				int toread = min(oobreadlen, max_oobsize);
 
 				if (toread) {
-					oob = nand_transfer_oob(chip,
+					oob = nand_transfer_oob(mtd,
 						oob, ops, toread);
 					oobreadlen -= toread;
 				}
@@ -2091,7 +2082,7 @@ static int nand_do_read_oob(struct mtd_info *mtd, loff_t from,
 			break;
 
 		len = min(len, readlen);
-		buf = nand_transfer_oob(chip, buf, ops, len);
+		buf = nand_transfer_oob(mtd, buf, ops, len);
 
 		if (chip->options & NAND_NEED_READRDY) {
 			/* Apply delay or wait for ready/busy pin */
@@ -2250,19 +2241,20 @@ static int nand_write_page_swecc(struct mtd_info *mtd, struct nand_chip *chip,
 				 const uint8_t *buf, int oob_required,
 				 int page)
 {
-	int i, eccsize = chip->ecc.size;
+	int i, eccsize = chip->ecc.size, ret;
 	int eccbytes = chip->ecc.bytes;
 	int eccsteps = chip->ecc.steps;
 	uint8_t *ecc_calc = chip->buffers->ecccalc;
 	const uint8_t *p = buf;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
 
 	/* Software ECC calculation */
 	for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize)
 		chip->ecc.calculate(mtd, p, &ecc_calc[i]);
 
-	for (i = 0; i < chip->ecc.total; i++)
-		chip->oob_poi[eccpos[i]] = ecc_calc[i];
+	ret = mtd_ooblayout_set_eccbytes(mtd, ecc_calc, chip->oob_poi, 0,
+					 chip->ecc.total);
+	if (ret)
+		return ret;
 
 	return chip->ecc.write_page_raw(mtd, chip, buf, 1, page);
 }
@@ -2279,12 +2271,11 @@ static int nand_write_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
 				  const uint8_t *buf, int oob_required,
 				  int page)
 {
-	int i, eccsize = chip->ecc.size;
+	int i, eccsize = chip->ecc.size, ret;
 	int eccbytes = chip->ecc.bytes;
 	int eccsteps = chip->ecc.steps;
 	uint8_t *ecc_calc = chip->buffers->ecccalc;
 	const uint8_t *p = buf;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
 
 	for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
 		chip->ecc.hwctl(mtd, NAND_ECC_WRITE);
@@ -2292,8 +2283,10 @@ static int nand_write_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
 		chip->ecc.calculate(mtd, p, &ecc_calc[i]);
 	}
 
-	for (i = 0; i < chip->ecc.total; i++)
-		chip->oob_poi[eccpos[i]] = ecc_calc[i];
+	ret = mtd_ooblayout_set_eccbytes(mtd, ecc_calc, chip->oob_poi, 0,
+					 chip->ecc.total);
+	if (ret)
+		return ret;
 
 	chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
 
@@ -2321,11 +2314,10 @@ static int nand_write_subpage_hwecc(struct mtd_info *mtd,
 	int ecc_size      = chip->ecc.size;
 	int ecc_bytes     = chip->ecc.bytes;
 	int ecc_steps     = chip->ecc.steps;
-	uint32_t *eccpos  = chip->ecc.layout->eccpos;
 	uint32_t start_step = offset / ecc_size;
 	uint32_t end_step   = (offset + data_len - 1) / ecc_size;
 	int oob_bytes       = mtd->oobsize / ecc_steps;
-	int step, i;
+	int step, ret;
 
 	for (step = 0; step < ecc_steps; step++) {
 		/* configure controller for WRITE access */
@@ -2353,8 +2345,10 @@ static int nand_write_subpage_hwecc(struct mtd_info *mtd,
 	/* copy calculated ECC for whole page to chip->buffer->oob */
 	/* this include masked-value(0xFF) for unwritten subpages */
 	ecc_calc = chip->buffers->ecccalc;
-	for (i = 0; i < chip->ecc.total; i++)
-		chip->oob_poi[eccpos[i]] = ecc_calc[i];
+	ret = mtd_ooblayout_set_eccbytes(mtd, ecc_calc, chip->oob_poi, 0,
+					 chip->ecc.total);
+	if (ret)
+		return ret;
 
 	/* write OOB buffer to NAND device */
 	chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
@@ -2491,6 +2485,7 @@ static uint8_t *nand_fill_oob(struct mtd_info *mtd, uint8_t *oob, size_t len,
 			      struct mtd_oob_ops *ops)
 {
 	struct nand_chip *chip = mtd_to_nand(mtd);
+	int ret;
 
 	/*
 	 * Initialise to all 0xFF, to avoid the possibility of left over OOB
@@ -2505,31 +2500,12 @@ static uint8_t *nand_fill_oob(struct mtd_info *mtd, uint8_t *oob, size_t len,
 		memcpy(chip->oob_poi + ops->ooboffs, oob, len);
 		return oob + len;
 
-	case MTD_OPS_AUTO_OOB: {
-		struct nand_oobfree *free = chip->ecc.layout->oobfree;
-		uint32_t boffs = 0, woffs = ops->ooboffs;
-		size_t bytes = 0;
-
-		for (; free->length && len; free++, len -= bytes) {
-			/* Write request not from offset 0? */
-			if (unlikely(woffs)) {
-				if (woffs >= free->length) {
-					woffs -= free->length;
-					continue;
-				}
-				boffs = free->offset + woffs;
-				bytes = min_t(size_t, len,
-					      (free->length - woffs));
-				woffs = 0;
-			} else {
-				bytes = min_t(size_t, len, free->length);
-				boffs = free->offset;
-			}
-			memcpy(chip->oob_poi + boffs, oob, bytes);
-			oob += bytes;
-		}
-		return oob;
-	}
+	case MTD_OPS_AUTO_OOB:
+		ret = mtd_ooblayout_set_databytes(mtd, oob, chip->oob_poi,
+						  ops->ooboffs, len);
+		BUG_ON(ret);
+		return oob + len;
+
 	default:
 		BUG();
 	}
@@ -4116,10 +4092,10 @@ static bool nand_ecc_strength_good(struct mtd_info *mtd)
  */
 int nand_scan_tail(struct mtd_info *mtd)
 {
-	int i;
 	struct nand_chip *chip = mtd_to_nand(mtd);
 	struct nand_ecc_ctrl *ecc = &chip->ecc;
 	struct nand_buffers *nbuf;
+	int ret;
 
 	/* New bad blocks should be marked in OOB, flash-based BBT, or both */
 	BUG_ON((chip->bbt_options & NAND_BBT_NO_OOB_BBM) &&
@@ -4311,20 +4287,10 @@ int nand_scan_tail(struct mtd_info *mtd)
 	if (!ecc->write_oob_raw)
 		ecc->write_oob_raw = ecc->write_oob;
 
-	/*
-	 * The number of bytes available for a client to place data into
-	 * the out of band area.
-	 */
-	mtd->oobavail = 0;
-	if (ecc->layout) {
-		for (i = 0; ecc->layout->oobfree[i].length; i++)
-			mtd->oobavail += ecc->layout->oobfree[i].length;
-	}
-
-	/* ECC sanity check: warn if it's too weak */
-	if (!nand_ecc_strength_good(mtd))
-		pr_warn("WARNING: %s: the ECC used on your system is too weak compared to the one required by the NAND chip\n",
-			mtd->name);
+	/* propagate ecc info to mtd_info */
+	mtd->ecclayout = ecc->layout;
+	mtd->ecc_strength = ecc->strength;
+	mtd->ecc_step_size = ecc->size;
 
 	/*
 	 * Set the number of read / write steps for one page depending on ECC
@@ -4337,6 +4303,21 @@ int nand_scan_tail(struct mtd_info *mtd)
 	}
 	ecc->total = ecc->steps * ecc->bytes;
 
+	/*
+	 * The number of bytes available for a client to place data into
+	 * the out of band area.
+	 */
+	ret = mtd_ooblayout_count_freebytes(mtd);
+	if (ret < 0)
+		ret = 0;
+
+	mtd->oobavail = ret;
+
+	/* ECC sanity check: warn if it's too weak */
+	if (!nand_ecc_strength_good(mtd))
+		pr_warn("WARNING: %s: the ECC used on your system is too weak compared to the one required by the NAND chip\n",
+			mtd->name);
+
 	/* Allow subpage writes up to ecc.steps. Not possible for MLC flash */
 	if (!(chip->options & NAND_NO_SUBPAGE_WRITE) && nand_is_slc(chip)) {
 		switch (ecc->steps) {
@@ -4393,10 +4374,6 @@ int nand_scan_tail(struct mtd_info *mtd)
 	mtd->_block_markbad = nand_block_markbad;
 	mtd->writebufsize = mtd->writesize;
 
-	/* propagate ecc info to mtd_info */
-	mtd->ecclayout = ecc->layout;
-	mtd->ecc_strength = ecc->strength;
-	mtd->ecc_step_size = ecc->size;
 	/*
 	 * Initialize bitflip_threshold to its default prior scan_bbt() call.
 	 * scan_bbt() might invoke mtd_read(), thus bitflip_threshold must be
diff --git a/drivers/mtd/nand/nand_bch.c b/drivers/mtd/nand/nand_bch.c
index b585bae..b3039de 100644
--- a/drivers/mtd/nand/nand_bch.c
+++ b/drivers/mtd/nand/nand_bch.c
@@ -196,7 +196,8 @@ struct nand_bch_control *nand_bch_init(struct mtd_info *mtd)
 		printk(KERN_WARNING "eccsize %u is too large\n", eccsize);
 		goto fail;
 	}
-	if (layout->eccbytes != (eccsteps*eccbytes)) {
+
+	if (mtd_ooblayout_count_eccbytes(mtd) != (eccsteps*eccbytes)) {
 		printk(KERN_WARNING "invalid ecc layout\n");
 		goto fail;
 	}
-- 
2.5.0

[PATCH v5 03/50] mtd: nand: core: use mtd_ooblayout_xxx() helpers where appropriate

[Boris Brezillon]

The mtd_ooblayout_xxx() helper functions have been added to avoid direct
accesses to the ecclayout field, and thus ease for future reworks.
Use these helpers in all places where the oobfree[] and eccpos[] arrays
where directly accessed.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/mtd/nand/nand_base.c | 201 +++++++++++++++++++------------------------
 drivers/mtd/nand/nand_bch.c  |   3 +-
 2 files changed, 91 insertions(+), 113 deletions(-)

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index c3733a1..36a58a0 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -1292,13 +1292,12 @@ static int nand_read_page_raw_syndrome(struct mtd_info *mtd,
 static int nand_read_page_swecc(struct mtd_info *mtd, struct nand_chip *chip,
 				uint8_t *buf, int oob_required, int page)
 {
-	int i, eccsize = chip->ecc.size;
+	int i, eccsize = chip->ecc.size, ret;
 	int eccbytes = chip->ecc.bytes;
 	int eccsteps = chip->ecc.steps;
 	uint8_t *p = buf;
 	uint8_t *ecc_calc = chip->buffers->ecccalc;
 	uint8_t *ecc_code = chip->buffers->ecccode;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
 	unsigned int max_bitflips = 0;
 
 	chip->ecc.read_page_raw(mtd, chip, buf, 1, page);
@@ -1306,8 +1305,10 @@ static int nand_read_page_swecc(struct mtd_info *mtd, struct nand_chip *chip,
 	for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize)
 		chip->ecc.calculate(mtd, p, &ecc_calc[i]);
 
-	for (i = 0; i < chip->ecc.total; i++)
-		ecc_code[i] = chip->oob_poi[eccpos[i]];
+	ret = mtd_ooblayout_get_eccbytes(mtd, ecc_code, chip->oob_poi, 0,
+					 chip->ecc.total);
+	if (ret)
+		return ret;
 
 	eccsteps = chip->ecc.steps;
 	p = buf;
@@ -1339,14 +1340,14 @@ static int nand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
 			uint32_t data_offs, uint32_t readlen, uint8_t *bufpoi,
 			int page)
 {
-	int start_step, end_step, num_steps;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
+	int start_step, end_step, num_steps, ret;
 	uint8_t *p;
 	int data_col_addr, i, gaps = 0;
 	int datafrag_len, eccfrag_len, aligned_len, aligned_pos;
 	int busw = (chip->options & NAND_BUSWIDTH_16) ? 2 : 1;
-	int index;
+	int index, section = 0;
 	unsigned int max_bitflips = 0;
+	struct mtd_oob_region oobregion = { };
 
 	/* Column address within the page aligned to ECC size (256bytes) */
 	start_step = data_offs / chip->ecc.size;
@@ -1374,12 +1375,13 @@ static int nand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
 	 * The performance is faster if we position offsets according to
 	 * ecc.pos. Let's make sure that there are no gaps in ECC positions.
 	 */
-	for (i = 0; i < eccfrag_len - 1; i++) {
-		if (eccpos[i + index] + 1 != eccpos[i + index + 1]) {
-			gaps = 1;
-			break;
-		}
-	}
+	ret = mtd_ooblayout_find_eccregion(mtd, index, &section, &oobregion);
+	if (ret)
+		return ret;
+
+	if (oobregion.length < eccfrag_len)
+		gaps = 1;
+
 	if (gaps) {
 		chip->cmdfunc(mtd, NAND_CMD_RNDOUT, mtd->writesize, -1);
 		chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
@@ -1388,20 +1390,23 @@ static int nand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
 		 * Send the command to read the particular ECC bytes take care
 		 * about buswidth alignment in read_buf.
 		 */
-		aligned_pos = eccpos[index] & ~(busw - 1);
+		aligned_pos = oobregion.offset & ~(busw - 1);
 		aligned_len = eccfrag_len;
-		if (eccpos[index] & (busw - 1))
+		if (oobregion.offset & (busw - 1))
 			aligned_len++;
-		if (eccpos[index + (num_steps * chip->ecc.bytes)] & (busw - 1))
+		if ((oobregion.offset + (num_steps * chip->ecc.bytes)) &
+		    (busw - 1))
 			aligned_len++;
 
 		chip->cmdfunc(mtd, NAND_CMD_RNDOUT,
-					mtd->writesize + aligned_pos, -1);
+			      mtd->writesize + aligned_pos, -1);
 		chip->read_buf(mtd, &chip->oob_poi[aligned_pos], aligned_len);
 	}
 
-	for (i = 0; i < eccfrag_len; i++)
-		chip->buffers->ecccode[i] = chip->oob_poi[eccpos[i + index]];
+	ret = mtd_ooblayout_get_eccbytes(mtd, chip->buffers->ecccode,
+					 chip->oob_poi, index, eccfrag_len);
+	if (ret)
+		return ret;
 
 	p = bufpoi + data_col_addr;
 	for (i = 0; i < eccfrag_len ; i += chip->ecc.bytes, p += chip->ecc.size) {
@@ -1442,13 +1447,12 @@ static int nand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
 static int nand_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
 				uint8_t *buf, int oob_required, int page)
 {
-	int i, eccsize = chip->ecc.size;
+	int i, eccsize = chip->ecc.size, ret;
 	int eccbytes = chip->ecc.bytes;
 	int eccsteps = chip->ecc.steps;
 	uint8_t *p = buf;
 	uint8_t *ecc_calc = chip->buffers->ecccalc;
 	uint8_t *ecc_code = chip->buffers->ecccode;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
 	unsigned int max_bitflips = 0;
 
 	for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
@@ -1458,8 +1462,10 @@ static int nand_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
 	}
 	chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
 
-	for (i = 0; i < chip->ecc.total; i++)
-		ecc_code[i] = chip->oob_poi[eccpos[i]];
+	ret = mtd_ooblayout_get_eccbytes(mtd, ecc_code, chip->oob_poi, 0,
+					 chip->ecc.total);
+	if (ret)
+		return ret;
 
 	eccsteps = chip->ecc.steps;
 	p = buf;
@@ -1504,12 +1510,11 @@ static int nand_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
 static int nand_read_page_hwecc_oob_first(struct mtd_info *mtd,
 	struct nand_chip *chip, uint8_t *buf, int oob_required, int page)
 {
-	int i, eccsize = chip->ecc.size;
+	int i, eccsize = chip->ecc.size, ret;
 	int eccbytes = chip->ecc.bytes;
 	int eccsteps = chip->ecc.steps;
 	uint8_t *p = buf;
 	uint8_t *ecc_code = chip->buffers->ecccode;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
 	uint8_t *ecc_calc = chip->buffers->ecccalc;
 	unsigned int max_bitflips = 0;
 
@@ -1518,8 +1523,10 @@ static int nand_read_page_hwecc_oob_first(struct mtd_info *mtd,
 	chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
 	chip->cmdfunc(mtd, NAND_CMD_READ0, 0, page);
 
-	for (i = 0; i < chip->ecc.total; i++)
-		ecc_code[i] = chip->oob_poi[eccpos[i]];
+	ret = mtd_ooblayout_get_eccbytes(mtd, ecc_code, chip->oob_poi, 0,
+					 chip->ecc.total);
+	if (ret)
+		return ret;
 
 	for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
 		int stat;
@@ -1620,14 +1627,17 @@ static int nand_read_page_syndrome(struct mtd_info *mtd, struct nand_chip *chip,
 
 /**
  * nand_transfer_oob - [INTERN] Transfer oob to client buffer
- * @chip: nand chip structure
+ * @mtd: mtd info structure
  * @oob: oob destination address
  * @ops: oob ops structure
  * @len: size of oob to transfer
  */
-static uint8_t *nand_transfer_oob(struct nand_chip *chip, uint8_t *oob,
+static uint8_t *nand_transfer_oob(struct mtd_info *mtd, uint8_t *oob,
 				  struct mtd_oob_ops *ops, size_t len)
 {
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	int ret;
+
 	switch (ops->mode) {
 
 	case MTD_OPS_PLACE_OOB:
@@ -1635,31 +1645,12 @@ static uint8_t *nand_transfer_oob(struct nand_chip *chip, uint8_t *oob,
 		memcpy(oob, chip->oob_poi + ops->ooboffs, len);
 		return oob + len;
 
-	case MTD_OPS_AUTO_OOB: {
-		struct nand_oobfree *free = chip->ecc.layout->oobfree;
-		uint32_t boffs = 0, roffs = ops->ooboffs;
-		size_t bytes = 0;
-
-		for (; free->length && len; free++, len -= bytes) {
-			/* Read request not from offset 0? */
-			if (unlikely(roffs)) {
-				if (roffs >= free->length) {
-					roffs -= free->length;
-					continue;
-				}
-				boffs = free->offset + roffs;
-				bytes = min_t(size_t, len,
-					      (free->length - roffs));
-				roffs = 0;
-			} else {
-				bytes = min_t(size_t, len, free->length);
-				boffs = free->offset;
-			}
-			memcpy(oob, chip->oob_poi + boffs, bytes);
-			oob += bytes;
-		}
-		return oob;
-	}
+	case MTD_OPS_AUTO_OOB:
+		ret = mtd_ooblayout_get_databytes(mtd, oob, chip->oob_poi,
+						  ops->ooboffs, len);
+		BUG_ON(ret);
+		return oob + len;
+
 	default:
 		BUG();
 	}
@@ -1793,7 +1784,7 @@ read_retry:
 				int toread = min(oobreadlen, max_oobsize);
 
 				if (toread) {
-					oob = nand_transfer_oob(chip,
+					oob = nand_transfer_oob(mtd,
 						oob, ops, toread);
 					oobreadlen -= toread;
 				}
@@ -2091,7 +2082,7 @@ static int nand_do_read_oob(struct mtd_info *mtd, loff_t from,
 			break;
 
 		len = min(len, readlen);
-		buf = nand_transfer_oob(chip, buf, ops, len);
+		buf = nand_transfer_oob(mtd, buf, ops, len);
 
 		if (chip->options & NAND_NEED_READRDY) {
 			/* Apply delay or wait for ready/busy pin */
@@ -2250,19 +2241,20 @@ static int nand_write_page_swecc(struct mtd_info *mtd, struct nand_chip *chip,
 				 const uint8_t *buf, int oob_required,
 				 int page)
 {
-	int i, eccsize = chip->ecc.size;
+	int i, eccsize = chip->ecc.size, ret;
 	int eccbytes = chip->ecc.bytes;
 	int eccsteps = chip->ecc.steps;
 	uint8_t *ecc_calc = chip->buffers->ecccalc;
 	const uint8_t *p = buf;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
 
 	/* Software ECC calculation */
 	for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize)
 		chip->ecc.calculate(mtd, p, &ecc_calc[i]);
 
-	for (i = 0; i < chip->ecc.total; i++)
-		chip->oob_poi[eccpos[i]] = ecc_calc[i];
+	ret = mtd_ooblayout_set_eccbytes(mtd, ecc_calc, chip->oob_poi, 0,
+					 chip->ecc.total);
+	if (ret)
+		return ret;
 
 	return chip->ecc.write_page_raw(mtd, chip, buf, 1, page);
 }
@@ -2279,12 +2271,11 @@ static int nand_write_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
 				  const uint8_t *buf, int oob_required,
 				  int page)
 {
-	int i, eccsize = chip->ecc.size;
+	int i, eccsize = chip->ecc.size, ret;
 	int eccbytes = chip->ecc.bytes;
 	int eccsteps = chip->ecc.steps;
 	uint8_t *ecc_calc = chip->buffers->ecccalc;
 	const uint8_t *p = buf;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
 
 	for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
 		chip->ecc.hwctl(mtd, NAND_ECC_WRITE);
@@ -2292,8 +2283,10 @@ static int nand_write_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
 		chip->ecc.calculate(mtd, p, &ecc_calc[i]);
 	}
 
-	for (i = 0; i < chip->ecc.total; i++)
-		chip->oob_poi[eccpos[i]] = ecc_calc[i];
+	ret = mtd_ooblayout_set_eccbytes(mtd, ecc_calc, chip->oob_poi, 0,
+					 chip->ecc.total);
+	if (ret)
+		return ret;
 
 	chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
 
@@ -2321,11 +2314,10 @@ static int nand_write_subpage_hwecc(struct mtd_info *mtd,
 	int ecc_size      = chip->ecc.size;
 	int ecc_bytes     = chip->ecc.bytes;
 	int ecc_steps     = chip->ecc.steps;
-	uint32_t *eccpos  = chip->ecc.layout->eccpos;
 	uint32_t start_step = offset / ecc_size;
 	uint32_t end_step   = (offset + data_len - 1) / ecc_size;
 	int oob_bytes       = mtd->oobsize / ecc_steps;
-	int step, i;
+	int step, ret;
 
 	for (step = 0; step < ecc_steps; step++) {
 		/* configure controller for WRITE access */
@@ -2353,8 +2345,10 @@ static int nand_write_subpage_hwecc(struct mtd_info *mtd,
 	/* copy calculated ECC for whole page to chip->buffer->oob */
 	/* this include masked-value(0xFF) for unwritten subpages */
 	ecc_calc = chip->buffers->ecccalc;
-	for (i = 0; i < chip->ecc.total; i++)
-		chip->oob_poi[eccpos[i]] = ecc_calc[i];
+	ret = mtd_ooblayout_set_eccbytes(mtd, ecc_calc, chip->oob_poi, 0,
+					 chip->ecc.total);
+	if (ret)
+		return ret;
 
 	/* write OOB buffer to NAND device */
 	chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
@@ -2491,6 +2485,7 @@ static uint8_t *nand_fill_oob(struct mtd_info *mtd, uint8_t *oob, size_t len,
 			      struct mtd_oob_ops *ops)
 {
 	struct nand_chip *chip = mtd_to_nand(mtd);
+	int ret;
 
 	/*
 	 * Initialise to all 0xFF, to avoid the possibility of left over OOB
@@ -2505,31 +2500,12 @@ static uint8_t *nand_fill_oob(struct mtd_info *mtd, uint8_t *oob, size_t len,
 		memcpy(chip->oob_poi + ops->ooboffs, oob, len);
 		return oob + len;
 
-	case MTD_OPS_AUTO_OOB: {
-		struct nand_oobfree *free = chip->ecc.layout->oobfree;
-		uint32_t boffs = 0, woffs = ops->ooboffs;
-		size_t bytes = 0;
-
-		for (; free->length && len; free++, len -= bytes) {
-			/* Write request not from offset 0? */
-			if (unlikely(woffs)) {
-				if (woffs >= free->length) {
-					woffs -= free->length;
-					continue;
-				}
-				boffs = free->offset + woffs;
-				bytes = min_t(size_t, len,
-					      (free->length - woffs));
-				woffs = 0;
-			} else {
-				bytes = min_t(size_t, len, free->length);
-				boffs = free->offset;
-			}
-			memcpy(chip->oob_poi + boffs, oob, bytes);
-			oob += bytes;
-		}
-		return oob;
-	}
+	case MTD_OPS_AUTO_OOB:
+		ret = mtd_ooblayout_set_databytes(mtd, oob, chip->oob_poi,
+						  ops->ooboffs, len);
+		BUG_ON(ret);
+		return oob + len;
+
 	default:
 		BUG();
 	}
@@ -4116,10 +4092,10 @@ static bool nand_ecc_strength_good(struct mtd_info *mtd)
  */
 int nand_scan_tail(struct mtd_info *mtd)
 {
-	int i;
 	struct nand_chip *chip = mtd_to_nand(mtd);
 	struct nand_ecc_ctrl *ecc = &chip->ecc;
 	struct nand_buffers *nbuf;
+	int ret;
 
 	/* New bad blocks should be marked in OOB, flash-based BBT, or both */
 	BUG_ON((chip->bbt_options & NAND_BBT_NO_OOB_BBM) &&
@@ -4311,20 +4287,10 @@ int nand_scan_tail(struct mtd_info *mtd)
 	if (!ecc->write_oob_raw)
 		ecc->write_oob_raw = ecc->write_oob;
 
-	/*
-	 * The number of bytes available for a client to place data into
-	 * the out of band area.
-	 */
-	mtd->oobavail = 0;
-	if (ecc->layout) {
-		for (i = 0; ecc->layout->oobfree[i].length; i++)
-			mtd->oobavail += ecc->layout->oobfree[i].length;
-	}
-
-	/* ECC sanity check: warn if it's too weak */
-	if (!nand_ecc_strength_good(mtd))
-		pr_warn("WARNING: %s: the ECC used on your system is too weak compared to the one required by the NAND chip\n",
-			mtd->name);
+	/* propagate ecc info to mtd_info */
+	mtd->ecclayout = ecc->layout;
+	mtd->ecc_strength = ecc->strength;
+	mtd->ecc_step_size = ecc->size;
 
 	/*
 	 * Set the number of read / write steps for one page depending on ECC
@@ -4337,6 +4303,21 @@ int nand_scan_tail(struct mtd_info *mtd)
 	}
 	ecc->total = ecc->steps * ecc->bytes;
 
+	/*
+	 * The number of bytes available for a client to place data into
+	 * the out of band area.
+	 */
+	ret = mtd_ooblayout_count_freebytes(mtd);
+	if (ret < 0)
+		ret = 0;
+
+	mtd->oobavail = ret;
+
+	/* ECC sanity check: warn if it's too weak */
+	if (!nand_ecc_strength_good(mtd))
+		pr_warn("WARNING: %s: the ECC used on your system is too weak compared to the one required by the NAND chip\n",
+			mtd->name);
+
 	/* Allow subpage writes up to ecc.steps. Not possible for MLC flash */
 	if (!(chip->options & NAND_NO_SUBPAGE_WRITE) && nand_is_slc(chip)) {
 		switch (ecc->steps) {
@@ -4393,10 +4374,6 @@ int nand_scan_tail(struct mtd_info *mtd)
 	mtd->_block_markbad = nand_block_markbad;
 	mtd->writebufsize = mtd->writesize;
 
-	/* propagate ecc info to mtd_info */
-	mtd->ecclayout = ecc->layout;
-	mtd->ecc_strength = ecc->strength;
-	mtd->ecc_step_size = ecc->size;
 	/*
 	 * Initialize bitflip_threshold to its default prior scan_bbt() call.
 	 * scan_bbt() might invoke mtd_read(), thus bitflip_threshold must be
diff --git a/drivers/mtd/nand/nand_bch.c b/drivers/mtd/nand/nand_bch.c
index b585bae..b3039de 100644
--- a/drivers/mtd/nand/nand_bch.c
+++ b/drivers/mtd/nand/nand_bch.c
@@ -196,7 +196,8 @@ struct nand_bch_control *nand_bch_init(struct mtd_info *mtd)
 		printk(KERN_WARNING "eccsize %u is too large\n", eccsize);
 		goto fail;
 	}
-	if (layout->eccbytes != (eccsteps*eccbytes)) {
+
+	if (mtd_ooblayout_count_eccbytes(mtd) != (eccsteps*eccbytes)) {
 		printk(KERN_WARNING "invalid ecc layout\n");
 		goto fail;
 	}
-- 
2.5.0

[PATCH v5 03/50] mtd: nand: core: use mtd_ooblayout_xxx() helpers where appropriate

[Boris Brezillon]

The mtd_ooblayout_xxx() helper functions have been added to avoid direct
accesses to the ecclayout field, and thus ease for future reworks.
Use these helpers in all places where the oobfree[] and eccpos[] arrays
where directly accessed.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/nand_base.c | 201 +++++++++++++++++++------------------------
 drivers/mtd/nand/nand_bch.c  |   3 +-
 2 files changed, 91 insertions(+), 113 deletions(-)

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index c3733a1..36a58a0 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -1292,13 +1292,12 @@ static int nand_read_page_raw_syndrome(struct mtd_info *mtd,
 static int nand_read_page_swecc(struct mtd_info *mtd, struct nand_chip *chip,
 				uint8_t *buf, int oob_required, int page)
 {
-	int i, eccsize = chip->ecc.size;
+	int i, eccsize = chip->ecc.size, ret;
 	int eccbytes = chip->ecc.bytes;
 	int eccsteps = chip->ecc.steps;
 	uint8_t *p = buf;
 	uint8_t *ecc_calc = chip->buffers->ecccalc;
 	uint8_t *ecc_code = chip->buffers->ecccode;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
 	unsigned int max_bitflips = 0;
 
 	chip->ecc.read_page_raw(mtd, chip, buf, 1, page);
@@ -1306,8 +1305,10 @@ static int nand_read_page_swecc(struct mtd_info *mtd, struct nand_chip *chip,
 	for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize)
 		chip->ecc.calculate(mtd, p, &ecc_calc[i]);
 
-	for (i = 0; i < chip->ecc.total; i++)
-		ecc_code[i] = chip->oob_poi[eccpos[i]];
+	ret = mtd_ooblayout_get_eccbytes(mtd, ecc_code, chip->oob_poi, 0,
+					 chip->ecc.total);
+	if (ret)
+		return ret;
 
 	eccsteps = chip->ecc.steps;
 	p = buf;
@@ -1339,14 +1340,14 @@ static int nand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
 			uint32_t data_offs, uint32_t readlen, uint8_t *bufpoi,
 			int page)
 {
-	int start_step, end_step, num_steps;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
+	int start_step, end_step, num_steps, ret;
 	uint8_t *p;
 	int data_col_addr, i, gaps = 0;
 	int datafrag_len, eccfrag_len, aligned_len, aligned_pos;
 	int busw = (chip->options & NAND_BUSWIDTH_16) ? 2 : 1;
-	int index;
+	int index, section = 0;
 	unsigned int max_bitflips = 0;
+	struct mtd_oob_region oobregion = { };
 
 	/* Column address within the page aligned to ECC size (256bytes) */
 	start_step = data_offs / chip->ecc.size;
@@ -1374,12 +1375,13 @@ static int nand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
 	 * The performance is faster if we position offsets according to
 	 * ecc.pos. Let's make sure that there are no gaps in ECC positions.
 	 */
-	for (i = 0; i < eccfrag_len - 1; i++) {
-		if (eccpos[i + index] + 1 != eccpos[i + index + 1]) {
-			gaps = 1;
-			break;
-		}
-	}
+	ret = mtd_ooblayout_find_eccregion(mtd, index, &section, &oobregion);
+	if (ret)
+		return ret;
+
+	if (oobregion.length < eccfrag_len)
+		gaps = 1;
+
 	if (gaps) {
 		chip->cmdfunc(mtd, NAND_CMD_RNDOUT, mtd->writesize, -1);
 		chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
@@ -1388,20 +1390,23 @@ static int nand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
 		 * Send the command to read the particular ECC bytes take care
 		 * about buswidth alignment in read_buf.
 		 */
-		aligned_pos = eccpos[index] & ~(busw - 1);
+		aligned_pos = oobregion.offset & ~(busw - 1);
 		aligned_len = eccfrag_len;
-		if (eccpos[index] & (busw - 1))
+		if (oobregion.offset & (busw - 1))
 			aligned_len++;
-		if (eccpos[index + (num_steps * chip->ecc.bytes)] & (busw - 1))
+		if ((oobregion.offset + (num_steps * chip->ecc.bytes)) &
+		    (busw - 1))
 			aligned_len++;
 
 		chip->cmdfunc(mtd, NAND_CMD_RNDOUT,
-					mtd->writesize + aligned_pos, -1);
+			      mtd->writesize + aligned_pos, -1);
 		chip->read_buf(mtd, &chip->oob_poi[aligned_pos], aligned_len);
 	}
 
-	for (i = 0; i < eccfrag_len; i++)
-		chip->buffers->ecccode[i] = chip->oob_poi[eccpos[i + index]];
+	ret = mtd_ooblayout_get_eccbytes(mtd, chip->buffers->ecccode,
+					 chip->oob_poi, index, eccfrag_len);
+	if (ret)
+		return ret;
 
 	p = bufpoi + data_col_addr;
 	for (i = 0; i < eccfrag_len ; i += chip->ecc.bytes, p += chip->ecc.size) {
@@ -1442,13 +1447,12 @@ static int nand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
 static int nand_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
 				uint8_t *buf, int oob_required, int page)
 {
-	int i, eccsize = chip->ecc.size;
+	int i, eccsize = chip->ecc.size, ret;
 	int eccbytes = chip->ecc.bytes;
 	int eccsteps = chip->ecc.steps;
 	uint8_t *p = buf;
 	uint8_t *ecc_calc = chip->buffers->ecccalc;
 	uint8_t *ecc_code = chip->buffers->ecccode;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
 	unsigned int max_bitflips = 0;
 
 	for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
@@ -1458,8 +1462,10 @@ static int nand_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
 	}
 	chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
 
-	for (i = 0; i < chip->ecc.total; i++)
-		ecc_code[i] = chip->oob_poi[eccpos[i]];
+	ret = mtd_ooblayout_get_eccbytes(mtd, ecc_code, chip->oob_poi, 0,
+					 chip->ecc.total);
+	if (ret)
+		return ret;
 
 	eccsteps = chip->ecc.steps;
 	p = buf;
@@ -1504,12 +1510,11 @@ static int nand_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
 static int nand_read_page_hwecc_oob_first(struct mtd_info *mtd,
 	struct nand_chip *chip, uint8_t *buf, int oob_required, int page)
 {
-	int i, eccsize = chip->ecc.size;
+	int i, eccsize = chip->ecc.size, ret;
 	int eccbytes = chip->ecc.bytes;
 	int eccsteps = chip->ecc.steps;
 	uint8_t *p = buf;
 	uint8_t *ecc_code = chip->buffers->ecccode;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
 	uint8_t *ecc_calc = chip->buffers->ecccalc;
 	unsigned int max_bitflips = 0;
 
@@ -1518,8 +1523,10 @@ static int nand_read_page_hwecc_oob_first(struct mtd_info *mtd,
 	chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
 	chip->cmdfunc(mtd, NAND_CMD_READ0, 0, page);
 
-	for (i = 0; i < chip->ecc.total; i++)
-		ecc_code[i] = chip->oob_poi[eccpos[i]];
+	ret = mtd_ooblayout_get_eccbytes(mtd, ecc_code, chip->oob_poi, 0,
+					 chip->ecc.total);
+	if (ret)
+		return ret;
 
 	for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
 		int stat;
@@ -1620,14 +1627,17 @@ static int nand_read_page_syndrome(struct mtd_info *mtd, struct nand_chip *chip,
 
 /**
  * nand_transfer_oob - [INTERN] Transfer oob to client buffer
- * @chip: nand chip structure
+ * @mtd: mtd info structure
  * @oob: oob destination address
  * @ops: oob ops structure
  * @len: size of oob to transfer
  */
-static uint8_t *nand_transfer_oob(struct nand_chip *chip, uint8_t *oob,
+static uint8_t *nand_transfer_oob(struct mtd_info *mtd, uint8_t *oob,
 				  struct mtd_oob_ops *ops, size_t len)
 {
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	int ret;
+
 	switch (ops->mode) {
 
 	case MTD_OPS_PLACE_OOB:
@@ -1635,31 +1645,12 @@ static uint8_t *nand_transfer_oob(struct nand_chip *chip, uint8_t *oob,
 		memcpy(oob, chip->oob_poi + ops->ooboffs, len);
 		return oob + len;
 
-	case MTD_OPS_AUTO_OOB: {
-		struct nand_oobfree *free = chip->ecc.layout->oobfree;
-		uint32_t boffs = 0, roffs = ops->ooboffs;
-		size_t bytes = 0;
-
-		for (; free->length && len; free++, len -= bytes) {
-			/* Read request not from offset 0? */
-			if (unlikely(roffs)) {
-				if (roffs >= free->length) {
-					roffs -= free->length;
-					continue;
-				}
-				boffs = free->offset + roffs;
-				bytes = min_t(size_t, len,
-					      (free->length - roffs));
-				roffs = 0;
-			} else {
-				bytes = min_t(size_t, len, free->length);
-				boffs = free->offset;
-			}
-			memcpy(oob, chip->oob_poi + boffs, bytes);
-			oob += bytes;
-		}
-		return oob;
-	}
+	case MTD_OPS_AUTO_OOB:
+		ret = mtd_ooblayout_get_databytes(mtd, oob, chip->oob_poi,
+						  ops->ooboffs, len);
+		BUG_ON(ret);
+		return oob + len;
+
 	default:
 		BUG();
 	}
@@ -1793,7 +1784,7 @@ read_retry:
 				int toread = min(oobreadlen, max_oobsize);
 
 				if (toread) {
-					oob = nand_transfer_oob(chip,
+					oob = nand_transfer_oob(mtd,
 						oob, ops, toread);
 					oobreadlen -= toread;
 				}
@@ -2091,7 +2082,7 @@ static int nand_do_read_oob(struct mtd_info *mtd, loff_t from,
 			break;
 
 		len = min(len, readlen);
-		buf = nand_transfer_oob(chip, buf, ops, len);
+		buf = nand_transfer_oob(mtd, buf, ops, len);
 
 		if (chip->options & NAND_NEED_READRDY) {
 			/* Apply delay or wait for ready/busy pin */
@@ -2250,19 +2241,20 @@ static int nand_write_page_swecc(struct mtd_info *mtd, struct nand_chip *chip,
 				 const uint8_t *buf, int oob_required,
 				 int page)
 {
-	int i, eccsize = chip->ecc.size;
+	int i, eccsize = chip->ecc.size, ret;
 	int eccbytes = chip->ecc.bytes;
 	int eccsteps = chip->ecc.steps;
 	uint8_t *ecc_calc = chip->buffers->ecccalc;
 	const uint8_t *p = buf;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
 
 	/* Software ECC calculation */
 	for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize)
 		chip->ecc.calculate(mtd, p, &ecc_calc[i]);
 
-	for (i = 0; i < chip->ecc.total; i++)
-		chip->oob_poi[eccpos[i]] = ecc_calc[i];
+	ret = mtd_ooblayout_set_eccbytes(mtd, ecc_calc, chip->oob_poi, 0,
+					 chip->ecc.total);
+	if (ret)
+		return ret;
 
 	return chip->ecc.write_page_raw(mtd, chip, buf, 1, page);
 }
@@ -2279,12 +2271,11 @@ static int nand_write_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
 				  const uint8_t *buf, int oob_required,
 				  int page)
 {
-	int i, eccsize = chip->ecc.size;
+	int i, eccsize = chip->ecc.size, ret;
 	int eccbytes = chip->ecc.bytes;
 	int eccsteps = chip->ecc.steps;
 	uint8_t *ecc_calc = chip->buffers->ecccalc;
 	const uint8_t *p = buf;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
 
 	for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
 		chip->ecc.hwctl(mtd, NAND_ECC_WRITE);
@@ -2292,8 +2283,10 @@ static int nand_write_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
 		chip->ecc.calculate(mtd, p, &ecc_calc[i]);
 	}
 
-	for (i = 0; i < chip->ecc.total; i++)
-		chip->oob_poi[eccpos[i]] = ecc_calc[i];
+	ret = mtd_ooblayout_set_eccbytes(mtd, ecc_calc, chip->oob_poi, 0,
+					 chip->ecc.total);
+	if (ret)
+		return ret;
 
 	chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
 
@@ -2321,11 +2314,10 @@ static int nand_write_subpage_hwecc(struct mtd_info *mtd,
 	int ecc_size      = chip->ecc.size;
 	int ecc_bytes     = chip->ecc.bytes;
 	int ecc_steps     = chip->ecc.steps;
-	uint32_t *eccpos  = chip->ecc.layout->eccpos;
 	uint32_t start_step = offset / ecc_size;
 	uint32_t end_step   = (offset + data_len - 1) / ecc_size;
 	int oob_bytes       = mtd->oobsize / ecc_steps;
-	int step, i;
+	int step, ret;
 
 	for (step = 0; step < ecc_steps; step++) {
 		/* configure controller for WRITE access */
@@ -2353,8 +2345,10 @@ static int nand_write_subpage_hwecc(struct mtd_info *mtd,
 	/* copy calculated ECC for whole page to chip->buffer->oob */
 	/* this include masked-value(0xFF) for unwritten subpages */
 	ecc_calc = chip->buffers->ecccalc;
-	for (i = 0; i < chip->ecc.total; i++)
-		chip->oob_poi[eccpos[i]] = ecc_calc[i];
+	ret = mtd_ooblayout_set_eccbytes(mtd, ecc_calc, chip->oob_poi, 0,
+					 chip->ecc.total);
+	if (ret)
+		return ret;
 
 	/* write OOB buffer to NAND device */
 	chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
@@ -2491,6 +2485,7 @@ static uint8_t *nand_fill_oob(struct mtd_info *mtd, uint8_t *oob, size_t len,
 			      struct mtd_oob_ops *ops)
 {
 	struct nand_chip *chip = mtd_to_nand(mtd);
+	int ret;
 
 	/*
 	 * Initialise to all 0xFF, to avoid the possibility of left over OOB
@@ -2505,31 +2500,12 @@ static uint8_t *nand_fill_oob(struct mtd_info *mtd, uint8_t *oob, size_t len,
 		memcpy(chip->oob_poi + ops->ooboffs, oob, len);
 		return oob + len;
 
-	case MTD_OPS_AUTO_OOB: {
-		struct nand_oobfree *free = chip->ecc.layout->oobfree;
-		uint32_t boffs = 0, woffs = ops->ooboffs;
-		size_t bytes = 0;
-
-		for (; free->length && len; free++, len -= bytes) {
-			/* Write request not from offset 0? */
-			if (unlikely(woffs)) {
-				if (woffs >= free->length) {
-					woffs -= free->length;
-					continue;
-				}
-				boffs = free->offset + woffs;
-				bytes = min_t(size_t, len,
-					      (free->length - woffs));
-				woffs = 0;
-			} else {
-				bytes = min_t(size_t, len, free->length);
-				boffs = free->offset;
-			}
-			memcpy(chip->oob_poi + boffs, oob, bytes);
-			oob += bytes;
-		}
-		return oob;
-	}
+	case MTD_OPS_AUTO_OOB:
+		ret = mtd_ooblayout_set_databytes(mtd, oob, chip->oob_poi,
+						  ops->ooboffs, len);
+		BUG_ON(ret);
+		return oob + len;
+
 	default:
 		BUG();
 	}
@@ -4116,10 +4092,10 @@ static bool nand_ecc_strength_good(struct mtd_info *mtd)
  */
 int nand_scan_tail(struct mtd_info *mtd)
 {
-	int i;
 	struct nand_chip *chip = mtd_to_nand(mtd);
 	struct nand_ecc_ctrl *ecc = &chip->ecc;
 	struct nand_buffers *nbuf;
+	int ret;
 
 	/* New bad blocks should be marked in OOB, flash-based BBT, or both */
 	BUG_ON((chip->bbt_options & NAND_BBT_NO_OOB_BBM) &&
@@ -4311,20 +4287,10 @@ int nand_scan_tail(struct mtd_info *mtd)
 	if (!ecc->write_oob_raw)
 		ecc->write_oob_raw = ecc->write_oob;
 
-	/*
-	 * The number of bytes available for a client to place data into
-	 * the out of band area.
-	 */
-	mtd->oobavail = 0;
-	if (ecc->layout) {
-		for (i = 0; ecc->layout->oobfree[i].length; i++)
-			mtd->oobavail += ecc->layout->oobfree[i].length;
-	}
-
-	/* ECC sanity check: warn if it's too weak */
-	if (!nand_ecc_strength_good(mtd))
-		pr_warn("WARNING: %s: the ECC used on your system is too weak compared to the one required by the NAND chip\n",
-			mtd->name);
+	/* propagate ecc info to mtd_info */
+	mtd->ecclayout = ecc->layout;
+	mtd->ecc_strength = ecc->strength;
+	mtd->ecc_step_size = ecc->size;
 
 	/*
 	 * Set the number of read / write steps for one page depending on ECC
@@ -4337,6 +4303,21 @@ int nand_scan_tail(struct mtd_info *mtd)
 	}
 	ecc->total = ecc->steps * ecc->bytes;
 
+	/*
+	 * The number of bytes available for a client to place data into
+	 * the out of band area.
+	 */
+	ret = mtd_ooblayout_count_freebytes(mtd);
+	if (ret < 0)
+		ret = 0;
+
+	mtd->oobavail = ret;
+
+	/* ECC sanity check: warn if it's too weak */
+	if (!nand_ecc_strength_good(mtd))
+		pr_warn("WARNING: %s: the ECC used on your system is too weak compared to the one required by the NAND chip\n",
+			mtd->name);
+
 	/* Allow subpage writes up to ecc.steps. Not possible for MLC flash */
 	if (!(chip->options & NAND_NO_SUBPAGE_WRITE) && nand_is_slc(chip)) {
 		switch (ecc->steps) {
@@ -4393,10 +4374,6 @@ int nand_scan_tail(struct mtd_info *mtd)
 	mtd->_block_markbad = nand_block_markbad;
 	mtd->writebufsize = mtd->writesize;
 
-	/* propagate ecc info to mtd_info */
-	mtd->ecclayout = ecc->layout;
-	mtd->ecc_strength = ecc->strength;
-	mtd->ecc_step_size = ecc->size;
 	/*
 	 * Initialize bitflip_threshold to its default prior scan_bbt() call.
 	 * scan_bbt() might invoke mtd_read(), thus bitflip_threshold must be
diff --git a/drivers/mtd/nand/nand_bch.c b/drivers/mtd/nand/nand_bch.c
index b585bae..b3039de 100644
--- a/drivers/mtd/nand/nand_bch.c
+++ b/drivers/mtd/nand/nand_bch.c
@@ -196,7 +196,8 @@ struct nand_bch_control *nand_bch_init(struct mtd_info *mtd)
 		printk(KERN_WARNING "eccsize %u is too large\n", eccsize);
 		goto fail;
 	}
-	if (layout->eccbytes != (eccsteps*eccbytes)) {
+
+	if (mtd_ooblayout_count_eccbytes(mtd) != (eccsteps*eccbytes)) {
 		printk(KERN_WARNING "invalid ecc layout\n");
 		goto fail;
 	}
-- 
2.5.0

[PATCH v5 04/50] mtd: nand: atmel: use mtd_ooblayout_xxx() helpers where appropriate

[Boris Brezillon]

The mtd_ooblayout_xxx() helper functions have been added to avoid direct
accesses to the ecclayout field, and thus ease for future reworks.
Use these helpers in all places where the oobfree[] and eccpos[] arrays
where directly accessed.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/atmel_nand.c | 48 ++++++++++++++++++++++++++-----------------
 1 file changed, 29 insertions(+), 19 deletions(-)

diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
index 0b5da72..321d331 100644
--- a/drivers/mtd/nand/atmel_nand.c
+++ b/drivers/mtd/nand/atmel_nand.c
@@ -836,13 +836,16 @@ static void pmecc_correct_data(struct mtd_info *mtd, uint8_t *buf, uint8_t *ecc,
 			dev_dbg(host->dev, "Bit flip in data area, byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
 				pos, bit_pos, err_byte, *(buf + byte_pos));
 		} else {
+			struct mtd_oob_region oobregion;
+
 			/* Bit flip in OOB area */
 			tmp = sector_num * nand_chip->ecc.bytes
 					+ (byte_pos - sector_size);
 			err_byte = ecc[tmp];
 			ecc[tmp] ^= (1 << bit_pos);
 
-			pos = tmp + nand_chip->ecc.layout->eccpos[0];
+			mtd_ooblayout_ecc(mtd, 0, &oobregion);
+			pos = tmp + oobregion.offset;
 			dev_dbg(host->dev, "Bit flip in OOB, oob_byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
 				pos, bit_pos, err_byte, ecc[tmp]);
 		}
@@ -934,7 +937,6 @@ static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
 	struct atmel_nand_host *host = nand_get_controller_data(chip);
 	int eccsize = chip->ecc.size * chip->ecc.steps;
 	uint8_t *oob = chip->oob_poi;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
 	uint32_t stat;
 	unsigned long end_time;
 	int bitflips = 0;
@@ -956,7 +958,11 @@ static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
 
 	stat = pmecc_readl_relaxed(host->ecc, ISR);
 	if (stat != 0) {
-		bitflips = pmecc_correction(mtd, stat, buf, &oob[eccpos[0]]);
+		struct mtd_oob_region oobregion;
+
+		mtd_ooblayout_ecc(mtd, 0, &oobregion);
+		bitflips = pmecc_correction(mtd, stat, buf,
+					    &oob[oobregion.offset]);
 		if (bitflips < 0)
 			/* uncorrectable errors */
 			return 0;
@@ -970,8 +976,8 @@ static int atmel_nand_pmecc_write_page(struct mtd_info *mtd,
 		int page)
 {
 	struct atmel_nand_host *host = nand_get_controller_data(chip);
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
-	int i, j;
+	struct mtd_oob_region oobregion = { };
+	int i, j, section = 0;
 	unsigned long end_time;
 
 	if (!host->nfc || !host->nfc->write_by_sram) {
@@ -990,11 +996,12 @@ static int atmel_nand_pmecc_write_page(struct mtd_info *mtd,
 
 	for (i = 0; i < chip->ecc.steps; i++) {
 		for (j = 0; j < chip->ecc.bytes; j++) {
-			int pos;
+			if (!oobregion.length)
+				mtd_ooblayout_ecc(mtd, section++, &oobregion);
 
-			pos = i * chip->ecc.bytes + j;
-			chip->oob_poi[eccpos[pos]] =
+			chip->oob_poi[oobregion.offset++] =
 				pmecc_readb_ecc_relaxed(host->ecc, i, j);
+			oobregion.length--;
 		}
 	}
 	chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
@@ -1008,6 +1015,7 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
 	struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
 	uint32_t val = 0;
 	struct nand_ecclayout *ecc_layout;
+	struct mtd_oob_region oobregion;
 
 	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST);
 	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DISABLE);
@@ -1059,9 +1067,10 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
 
 	ecc_layout = nand_chip->ecc.layout;
 	pmecc_writel(host->ecc, SAREA, mtd->oobsize - 1);
-	pmecc_writel(host->ecc, SADDR, ecc_layout->eccpos[0]);
+	mtd_ooblayout_ecc(mtd, 0, &oobregion);
+	pmecc_writel(host->ecc, SADDR, oobregion.offset);
 	pmecc_writel(host->ecc, EADDR,
-			ecc_layout->eccpos[ecc_layout->eccbytes - 1]);
+		     oobregion.offset + ecc_layout->eccbytes - 1);
 	/* See datasheet about PMECC Clock Control Register */
 	pmecc_writel(host->ecc, CLK, 2);
 	pmecc_writel(host->ecc, IDR, 0xff);
@@ -1362,12 +1371,12 @@ static int atmel_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
 {
 	int eccsize = chip->ecc.size;
 	int eccbytes = chip->ecc.bytes;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
 	uint8_t *p = buf;
 	uint8_t *oob = chip->oob_poi;
 	uint8_t *ecc_pos;
 	int stat;
 	unsigned int max_bitflips = 0;
+	struct mtd_oob_region oobregion = {};
 
 	/*
 	 * Errata: ALE is incorrectly wired up to the ECC controller
@@ -1385,19 +1394,20 @@ static int atmel_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
 	chip->read_buf(mtd, p, eccsize);
 
 	/* move to ECC position if needed */
-	if (eccpos[0] != 0) {
-		/* This only works on large pages
-		 * because the ECC controller waits for
-		 * NAND_CMD_RNDOUTSTART after the
-		 * NAND_CMD_RNDOUT.
-		 * anyway, for small pages, the eccpos[0] == 0
+	mtd_ooblayout_ecc(mtd, 0, &oobregion);
+	if (oobregion.offset != 0) {
+		/*
+		 * This only works on large pages because the ECC controller
+		 * waits for NAND_CMD_RNDOUTSTART after the NAND_CMD_RNDOUT.
+		 * Anyway, for small pages, the first ECC byte is at offset
+		 * 0 in the OOB area.
 		 */
 		chip->cmdfunc(mtd, NAND_CMD_RNDOUT,
-				mtd->writesize + eccpos[0], -1);
+			      mtd->writesize + oobregion.offset, -1);
 	}
 
 	/* the ECC controller needs to read the ECC just after the data */
-	ecc_pos = oob + eccpos[0];
+	ecc_pos = oob + oobregion.offset;
 	chip->read_buf(mtd, ecc_pos, eccbytes);
 
 	/* check if there's an error */
-- 
2.5.0

[PATCH v5 04/50] mtd: nand: atmel: use mtd_ooblayout_xxx() helpers where appropriate

[Boris Brezillon]

The mtd_ooblayout_xxx() helper functions have been added to avoid direct
accesses to the ecclayout field, and thus ease for future reworks.
Use these helpers in all places where the oobfree[] and eccpos[] arrays
where directly accessed.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/mtd/nand/atmel_nand.c | 48 ++++++++++++++++++++++++++-----------------
 1 file changed, 29 insertions(+), 19 deletions(-)

diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
index 0b5da72..321d331 100644
--- a/drivers/mtd/nand/atmel_nand.c
+++ b/drivers/mtd/nand/atmel_nand.c
@@ -836,13 +836,16 @@ static void pmecc_correct_data(struct mtd_info *mtd, uint8_t *buf, uint8_t *ecc,
 			dev_dbg(host->dev, "Bit flip in data area, byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
 				pos, bit_pos, err_byte, *(buf + byte_pos));
 		} else {
+			struct mtd_oob_region oobregion;
+
 			/* Bit flip in OOB area */
 			tmp = sector_num * nand_chip->ecc.bytes
 					+ (byte_pos - sector_size);
 			err_byte = ecc[tmp];
 			ecc[tmp] ^= (1 << bit_pos);
 
-			pos = tmp + nand_chip->ecc.layout->eccpos[0];
+			mtd_ooblayout_ecc(mtd, 0, &oobregion);
+			pos = tmp + oobregion.offset;
 			dev_dbg(host->dev, "Bit flip in OOB, oob_byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
 				pos, bit_pos, err_byte, ecc[tmp]);
 		}
@@ -934,7 +937,6 @@ static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
 	struct atmel_nand_host *host = nand_get_controller_data(chip);
 	int eccsize = chip->ecc.size * chip->ecc.steps;
 	uint8_t *oob = chip->oob_poi;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
 	uint32_t stat;
 	unsigned long end_time;
 	int bitflips = 0;
@@ -956,7 +958,11 @@ static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
 
 	stat = pmecc_readl_relaxed(host->ecc, ISR);
 	if (stat != 0) {
-		bitflips = pmecc_correction(mtd, stat, buf, &oob[eccpos[0]]);
+		struct mtd_oob_region oobregion;
+
+		mtd_ooblayout_ecc(mtd, 0, &oobregion);
+		bitflips = pmecc_correction(mtd, stat, buf,
+					    &oob[oobregion.offset]);
 		if (bitflips < 0)
 			/* uncorrectable errors */
 			return 0;
@@ -970,8 +976,8 @@ static int atmel_nand_pmecc_write_page(struct mtd_info *mtd,
 		int page)
 {
 	struct atmel_nand_host *host = nand_get_controller_data(chip);
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
-	int i, j;
+	struct mtd_oob_region oobregion = { };
+	int i, j, section = 0;
 	unsigned long end_time;
 
 	if (!host->nfc || !host->nfc->write_by_sram) {
@@ -990,11 +996,12 @@ static int atmel_nand_pmecc_write_page(struct mtd_info *mtd,
 
 	for (i = 0; i < chip->ecc.steps; i++) {
 		for (j = 0; j < chip->ecc.bytes; j++) {
-			int pos;
+			if (!oobregion.length)
+				mtd_ooblayout_ecc(mtd, section++, &oobregion);
 
-			pos = i * chip->ecc.bytes + j;
-			chip->oob_poi[eccpos[pos]] =
+			chip->oob_poi[oobregion.offset++] =
 				pmecc_readb_ecc_relaxed(host->ecc, i, j);
+			oobregion.length--;
 		}
 	}
 	chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
@@ -1008,6 +1015,7 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
 	struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
 	uint32_t val = 0;
 	struct nand_ecclayout *ecc_layout;
+	struct mtd_oob_region oobregion;
 
 	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST);
 	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DISABLE);
@@ -1059,9 +1067,10 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
 
 	ecc_layout = nand_chip->ecc.layout;
 	pmecc_writel(host->ecc, SAREA, mtd->oobsize - 1);
-	pmecc_writel(host->ecc, SADDR, ecc_layout->eccpos[0]);
+	mtd_ooblayout_ecc(mtd, 0, &oobregion);
+	pmecc_writel(host->ecc, SADDR, oobregion.offset);
 	pmecc_writel(host->ecc, EADDR,
-			ecc_layout->eccpos[ecc_layout->eccbytes - 1]);
+		     oobregion.offset + ecc_layout->eccbytes - 1);
 	/* See datasheet about PMECC Clock Control Register */
 	pmecc_writel(host->ecc, CLK, 2);
 	pmecc_writel(host->ecc, IDR, 0xff);
@@ -1362,12 +1371,12 @@ static int atmel_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
 {
 	int eccsize = chip->ecc.size;
 	int eccbytes = chip->ecc.bytes;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
 	uint8_t *p = buf;
 	uint8_t *oob = chip->oob_poi;
 	uint8_t *ecc_pos;
 	int stat;
 	unsigned int max_bitflips = 0;
+	struct mtd_oob_region oobregion = {};
 
 	/*
 	 * Errata: ALE is incorrectly wired up to the ECC controller
@@ -1385,19 +1394,20 @@ static int atmel_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
 	chip->read_buf(mtd, p, eccsize);
 
 	/* move to ECC position if needed */
-	if (eccpos[0] != 0) {
-		/* This only works on large pages
-		 * because the ECC controller waits for
-		 * NAND_CMD_RNDOUTSTART after the
-		 * NAND_CMD_RNDOUT.
-		 * anyway, for small pages, the eccpos[0] == 0
+	mtd_ooblayout_ecc(mtd, 0, &oobregion);
+	if (oobregion.offset != 0) {
+		/*
+		 * This only works on large pages because the ECC controller
+		 * waits for NAND_CMD_RNDOUTSTART after the NAND_CMD_RNDOUT.
+		 * Anyway, for small pages, the first ECC byte is at offset
+		 * 0 in the OOB area.
 		 */
 		chip->cmdfunc(mtd, NAND_CMD_RNDOUT,
-				mtd->writesize + eccpos[0], -1);
+			      mtd->writesize + oobregion.offset, -1);
 	}
 
 	/* the ECC controller needs to read the ECC just after the data */
-	ecc_pos = oob + eccpos[0];
+	ecc_pos = oob + oobregion.offset;
 	chip->read_buf(mtd, ecc_pos, eccbytes);
 
 	/* check if there's an error */
-- 
2.5.0

[PATCH v5 04/50] mtd: nand: atmel: use mtd_ooblayout_xxx() helpers where appropriate

[Boris Brezillon]

The mtd_ooblayout_xxx() helper functions have been added to avoid direct
accesses to the ecclayout field, and thus ease for future reworks.
Use these helpers in all places where the oobfree[] and eccpos[] arrays
where directly accessed.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/atmel_nand.c | 48 ++++++++++++++++++++++++++-----------------
 1 file changed, 29 insertions(+), 19 deletions(-)

diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
index 0b5da72..321d331 100644
--- a/drivers/mtd/nand/atmel_nand.c
+++ b/drivers/mtd/nand/atmel_nand.c
@@ -836,13 +836,16 @@ static void pmecc_correct_data(struct mtd_info *mtd, uint8_t *buf, uint8_t *ecc,
 			dev_dbg(host->dev, "Bit flip in data area, byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
 				pos, bit_pos, err_byte, *(buf + byte_pos));
 		} else {
+			struct mtd_oob_region oobregion;
+
 			/* Bit flip in OOB area */
 			tmp = sector_num * nand_chip->ecc.bytes
 					+ (byte_pos - sector_size);
 			err_byte = ecc[tmp];
 			ecc[tmp] ^= (1 << bit_pos);
 
-			pos = tmp + nand_chip->ecc.layout->eccpos[0];
+			mtd_ooblayout_ecc(mtd, 0, &oobregion);
+			pos = tmp + oobregion.offset;
 			dev_dbg(host->dev, "Bit flip in OOB, oob_byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
 				pos, bit_pos, err_byte, ecc[tmp]);
 		}
@@ -934,7 +937,6 @@ static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
 	struct atmel_nand_host *host = nand_get_controller_data(chip);
 	int eccsize = chip->ecc.size * chip->ecc.steps;
 	uint8_t *oob = chip->oob_poi;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
 	uint32_t stat;
 	unsigned long end_time;
 	int bitflips = 0;
@@ -956,7 +958,11 @@ static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
 
 	stat = pmecc_readl_relaxed(host->ecc, ISR);
 	if (stat != 0) {
-		bitflips = pmecc_correction(mtd, stat, buf, &oob[eccpos[0]]);
+		struct mtd_oob_region oobregion;
+
+		mtd_ooblayout_ecc(mtd, 0, &oobregion);
+		bitflips = pmecc_correction(mtd, stat, buf,
+					    &oob[oobregion.offset]);
 		if (bitflips < 0)
 			/* uncorrectable errors */
 			return 0;
@@ -970,8 +976,8 @@ static int atmel_nand_pmecc_write_page(struct mtd_info *mtd,
 		int page)
 {
 	struct atmel_nand_host *host = nand_get_controller_data(chip);
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
-	int i, j;
+	struct mtd_oob_region oobregion = { };
+	int i, j, section = 0;
 	unsigned long end_time;
 
 	if (!host->nfc || !host->nfc->write_by_sram) {
@@ -990,11 +996,12 @@ static int atmel_nand_pmecc_write_page(struct mtd_info *mtd,
 
 	for (i = 0; i < chip->ecc.steps; i++) {
 		for (j = 0; j < chip->ecc.bytes; j++) {
-			int pos;
+			if (!oobregion.length)
+				mtd_ooblayout_ecc(mtd, section++, &oobregion);
 
-			pos = i * chip->ecc.bytes + j;
-			chip->oob_poi[eccpos[pos]] =
+			chip->oob_poi[oobregion.offset++] =
 				pmecc_readb_ecc_relaxed(host->ecc, i, j);
+			oobregion.length--;
 		}
 	}
 	chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
@@ -1008,6 +1015,7 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
 	struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
 	uint32_t val = 0;
 	struct nand_ecclayout *ecc_layout;
+	struct mtd_oob_region oobregion;
 
 	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST);
 	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DISABLE);
@@ -1059,9 +1067,10 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
 
 	ecc_layout = nand_chip->ecc.layout;
 	pmecc_writel(host->ecc, SAREA, mtd->oobsize - 1);
-	pmecc_writel(host->ecc, SADDR, ecc_layout->eccpos[0]);
+	mtd_ooblayout_ecc(mtd, 0, &oobregion);
+	pmecc_writel(host->ecc, SADDR, oobregion.offset);
 	pmecc_writel(host->ecc, EADDR,
-			ecc_layout->eccpos[ecc_layout->eccbytes - 1]);
+		     oobregion.offset + ecc_layout->eccbytes - 1);
 	/* See datasheet about PMECC Clock Control Register */
 	pmecc_writel(host->ecc, CLK, 2);
 	pmecc_writel(host->ecc, IDR, 0xff);
@@ -1362,12 +1371,12 @@ static int atmel_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
 {
 	int eccsize = chip->ecc.size;
 	int eccbytes = chip->ecc.bytes;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
 	uint8_t *p = buf;
 	uint8_t *oob = chip->oob_poi;
 	uint8_t *ecc_pos;
 	int stat;
 	unsigned int max_bitflips = 0;
+	struct mtd_oob_region oobregion = {};
 
 	/*
 	 * Errata: ALE is incorrectly wired up to the ECC controller
@@ -1385,19 +1394,20 @@ static int atmel_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
 	chip->read_buf(mtd, p, eccsize);
 
 	/* move to ECC position if needed */
-	if (eccpos[0] != 0) {
-		/* This only works on large pages
-		 * because the ECC controller waits for
-		 * NAND_CMD_RNDOUTSTART after the
-		 * NAND_CMD_RNDOUT.
-		 * anyway, for small pages, the eccpos[0] == 0
+	mtd_ooblayout_ecc(mtd, 0, &oobregion);
+	if (oobregion.offset != 0) {
+		/*
+		 * This only works on large pages because the ECC controller
+		 * waits for NAND_CMD_RNDOUTSTART after the NAND_CMD_RNDOUT.
+		 * Anyway, for small pages, the first ECC byte is at offset
+		 * 0 in the OOB area.
 		 */
 		chip->cmdfunc(mtd, NAND_CMD_RNDOUT,
-				mtd->writesize + eccpos[0], -1);
+			      mtd->writesize + oobregion.offset, -1);
 	}
 
 	/* the ECC controller needs to read the ECC just after the data */
-	ecc_pos = oob + eccpos[0];
+	ecc_pos = oob + oobregion.offset;
 	chip->read_buf(mtd, ecc_pos, eccbytes);
 
 	/* check if there's an error */
-- 
2.5.0

[PATCH v5 05/50] mtd: nand: fsl_ifc: use mtd_ooblayout_xxx() helpers where appropriate

[Boris Brezillon]

The mtd_ooblayout_xxx() helper functions have been added to avoid direct
accesses to the ecclayout field, and thus ease for future reworks.
Use these helpers in all places where the oobfree[] and eccpos[] arrays
where directly accessed.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/fsl_ifc_nand.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/mtd/nand/fsl_ifc_nand.c b/drivers/mtd/nand/fsl_ifc_nand.c
index 43f5a3a..2e970ac 100644
--- a/drivers/mtd/nand/fsl_ifc_nand.c
+++ b/drivers/mtd/nand/fsl_ifc_nand.c
@@ -257,18 +257,22 @@ static int is_blank(struct mtd_info *mtd, unsigned int bufnum)
 	u8 __iomem *addr = priv->vbase + bufnum * (mtd->writesize * 2);
 	u32 __iomem *mainarea = (u32 __iomem *)addr;
 	u8 __iomem *oob = addr + mtd->writesize;
-	int i;
+	struct mtd_oob_region oobregion = { };
+	int i, section = 0;
 
 	for (i = 0; i < mtd->writesize / 4; i++) {
 		if (__raw_readl(&mainarea[i]) != 0xffffffff)
 			return 0;
 	}
 
-	for (i = 0; i < chip->ecc.layout->eccbytes; i++) {
-		int pos = chip->ecc.layout->eccpos[i];
+	mtd_ooblayout_ecc(mtd, section++, &oobregion);
+	while (oobregion.length) {
+		for (i = 0; i < oobregion.length; i++) {
+			if (__raw_readb(&oob[oobregion.offset + i]) != 0xff)
+				return 0;
+		}
 
-		if (__raw_readb(&oob[pos]) != 0xff)
-			return 0;
+		mtd_ooblayout_ecc(mtd, section++, &oobregion);
 	}
 
 	return 1;
-- 
2.5.0

[PATCH v5 05/50] mtd: nand: fsl_ifc: use mtd_ooblayout_xxx() helpers where appropriate

[Boris Brezillon]

The mtd_ooblayout_xxx() helper functions have been added to avoid direct
accesses to the ecclayout field, and thus ease for future reworks.
Use these helpers in all places where the oobfree[] and eccpos[] arrays
where directly accessed.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/mtd/nand/fsl_ifc_nand.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/mtd/nand/fsl_ifc_nand.c b/drivers/mtd/nand/fsl_ifc_nand.c
index 43f5a3a..2e970ac 100644
--- a/drivers/mtd/nand/fsl_ifc_nand.c
+++ b/drivers/mtd/nand/fsl_ifc_nand.c
@@ -257,18 +257,22 @@ static int is_blank(struct mtd_info *mtd, unsigned int bufnum)
 	u8 __iomem *addr = priv->vbase + bufnum * (mtd->writesize * 2);
 	u32 __iomem *mainarea = (u32 __iomem *)addr;
 	u8 __iomem *oob = addr + mtd->writesize;
-	int i;
+	struct mtd_oob_region oobregion = { };
+	int i, section = 0;
 
 	for (i = 0; i < mtd->writesize / 4; i++) {
 		if (__raw_readl(&mainarea[i]) != 0xffffffff)
 			return 0;
 	}
 
-	for (i = 0; i < chip->ecc.layout->eccbytes; i++) {
-		int pos = chip->ecc.layout->eccpos[i];
+	mtd_ooblayout_ecc(mtd, section++, &oobregion);
+	while (oobregion.length) {
+		for (i = 0; i < oobregion.length; i++) {
+			if (__raw_readb(&oob[oobregion.offset + i]) != 0xff)
+				return 0;
+		}
 
-		if (__raw_readb(&oob[pos]) != 0xff)
-			return 0;
+		mtd_ooblayout_ecc(mtd, section++, &oobregion);
 	}
 
 	return 1;
-- 
2.5.0

[PATCH v5 05/50] mtd: nand: fsl_ifc: use mtd_ooblayout_xxx() helpers where appropriate

[Boris Brezillon]

The mtd_ooblayout_xxx() helper functions have been added to avoid direct
accesses to the ecclayout field, and thus ease for future reworks.
Use these helpers in all places where the oobfree[] and eccpos[] arrays
where directly accessed.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/fsl_ifc_nand.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/mtd/nand/fsl_ifc_nand.c b/drivers/mtd/nand/fsl_ifc_nand.c
index 43f5a3a..2e970ac 100644
--- a/drivers/mtd/nand/fsl_ifc_nand.c
+++ b/drivers/mtd/nand/fsl_ifc_nand.c
@@ -257,18 +257,22 @@ static int is_blank(struct mtd_info *mtd, unsigned int bufnum)
 	u8 __iomem *addr = priv->vbase + bufnum * (mtd->writesize * 2);
 	u32 __iomem *mainarea = (u32 __iomem *)addr;
 	u8 __iomem *oob = addr + mtd->writesize;
-	int i;
+	struct mtd_oob_region oobregion = { };
+	int i, section = 0;
 
 	for (i = 0; i < mtd->writesize / 4; i++) {
 		if (__raw_readl(&mainarea[i]) != 0xffffffff)
 			return 0;
 	}
 
-	for (i = 0; i < chip->ecc.layout->eccbytes; i++) {
-		int pos = chip->ecc.layout->eccpos[i];
+	mtd_ooblayout_ecc(mtd, section++, &oobregion);
+	while (oobregion.length) {
+		for (i = 0; i < oobregion.length; i++) {
+			if (__raw_readb(&oob[oobregion.offset + i]) != 0xff)
+				return 0;
+		}
 
-		if (__raw_readb(&oob[pos]) != 0xff)
-			return 0;
+		mtd_ooblayout_ecc(mtd, section++, &oobregion);
 	}
 
 	return 1;
-- 
2.5.0

[PATCH v5 06/50] mtd: nand: gpmi: use mtd_ooblayout_xxx() helpers where appropriate

[Boris Brezillon]

The mtd_ooblayout_xxx() helper functions have been added to avoid direct
accesses to the ecclayout field, and thus ease for future reworks.
Use these helpers in all places where the oobfree[] and eccpos[] arrays
where directly accessed.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/gpmi-nand/gpmi-nand.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
index 8122c69..3a29b65 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
@@ -1327,18 +1327,19 @@ static int gpmi_ecc_read_oob(struct mtd_info *mtd, struct nand_chip *chip,
 static int
 gpmi_ecc_write_oob(struct mtd_info *mtd, struct nand_chip *chip, int page)
 {
-	struct nand_oobfree *of = mtd->ecclayout->oobfree;
+	struct mtd_oob_region of = { };
 	int status = 0;
 
 	/* Do we have available oob area? */
-	if (!of->length)
+	mtd_ooblayout_free(mtd, 0, &of);
+	if (!of.length)
 		return -EPERM;
 
 	if (!nand_is_slc(chip))
 		return -EPERM;
 
-	chip->cmdfunc(mtd, NAND_CMD_SEQIN, mtd->writesize + of->offset, page);
-	chip->write_buf(mtd, chip->oob_poi + of->offset, of->length);
+	chip->cmdfunc(mtd, NAND_CMD_SEQIN, mtd->writesize + of.offset, page);
+	chip->write_buf(mtd, chip->oob_poi + of.offset, of.length);
 	chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
 
 	status = chip->waitfunc(mtd, chip);
-- 
2.5.0

[PATCH v5 06/50] mtd: nand: gpmi: use mtd_ooblayout_xxx() helpers where appropriate

[Boris Brezillon]

The mtd_ooblayout_xxx() helper functions have been added to avoid direct
accesses to the ecclayout field, and thus ease for future reworks.
Use these helpers in all places where the oobfree[] and eccpos[] arrays
where directly accessed.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/mtd/nand/gpmi-nand/gpmi-nand.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
index 8122c69..3a29b65 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
@@ -1327,18 +1327,19 @@ static int gpmi_ecc_read_oob(struct mtd_info *mtd, struct nand_chip *chip,
 static int
 gpmi_ecc_write_oob(struct mtd_info *mtd, struct nand_chip *chip, int page)
 {
-	struct nand_oobfree *of = mtd->ecclayout->oobfree;
+	struct mtd_oob_region of = { };
 	int status = 0;
 
 	/* Do we have available oob area? */
-	if (!of->length)
+	mtd_ooblayout_free(mtd, 0, &of);
+	if (!of.length)
 		return -EPERM;
 
 	if (!nand_is_slc(chip))
 		return -EPERM;
 
-	chip->cmdfunc(mtd, NAND_CMD_SEQIN, mtd->writesize + of->offset, page);
-	chip->write_buf(mtd, chip->oob_poi + of->offset, of->length);
+	chip->cmdfunc(mtd, NAND_CMD_SEQIN, mtd->writesize + of.offset, page);
+	chip->write_buf(mtd, chip->oob_poi + of.offset, of.length);
 	chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
 
 	status = chip->waitfunc(mtd, chip);
-- 
2.5.0

[PATCH v5 06/50] mtd: nand: gpmi: use mtd_ooblayout_xxx() helpers where appropriate

[Boris Brezillon]

The mtd_ooblayout_xxx() helper functions have been added to avoid direct
accesses to the ecclayout field, and thus ease for future reworks.
Use these helpers in all places where the oobfree[] and eccpos[] arrays
where directly accessed.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/gpmi-nand/gpmi-nand.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
index 8122c69..3a29b65 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
@@ -1327,18 +1327,19 @@ static int gpmi_ecc_read_oob(struct mtd_info *mtd, struct nand_chip *chip,
 static int
 gpmi_ecc_write_oob(struct mtd_info *mtd, struct nand_chip *chip, int page)
 {
-	struct nand_oobfree *of = mtd->ecclayout->oobfree;
+	struct mtd_oob_region of = { };
 	int status = 0;
 
 	/* Do we have available oob area? */
-	if (!of->length)
+	mtd_ooblayout_free(mtd, 0, &of);
+	if (!of.length)
 		return -EPERM;
 
 	if (!nand_is_slc(chip))
 		return -EPERM;
 
-	chip->cmdfunc(mtd, NAND_CMD_SEQIN, mtd->writesize + of->offset, page);
-	chip->write_buf(mtd, chip->oob_poi + of->offset, of->length);
+	chip->cmdfunc(mtd, NAND_CMD_SEQIN, mtd->writesize + of.offset, page);
+	chip->write_buf(mtd, chip->oob_poi + of.offset, of.length);
 	chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
 
 	status = chip->waitfunc(mtd, chip);
-- 
2.5.0

[PATCH v5 07/50] mtd: nand: lpc32xx: use mtd_ooblayout_xxx() helpers where appropriate

[Boris Brezillon]

The mtd_ooblayout_xxx() helper functions have been added to avoid direct
accesses to the ecclayout field, and thus ease for future reworks.
Use these helpers in all places where the oobfree[] and eccpos[] arrays
where directly accessed.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/lpc32xx_slc.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/mtd/nand/lpc32xx_slc.c b/drivers/mtd/nand/lpc32xx_slc.c
index 3b8f373..10cf8e62 100644
--- a/drivers/mtd/nand/lpc32xx_slc.c
+++ b/drivers/mtd/nand/lpc32xx_slc.c
@@ -604,7 +604,8 @@ static int lpc32xx_nand_read_page_syndrome(struct mtd_info *mtd,
 					   int oob_required, int page)
 {
 	struct lpc32xx_nand_host *host = nand_get_controller_data(chip);
-	int stat, i, status;
+	struct mtd_oob_region oobregion = { };
+	int stat, i, status, error;
 	uint8_t *oobecc, tmpecc[LPC32XX_ECC_SAVE_SIZE];
 
 	/* Issue read command */
@@ -620,7 +621,11 @@ static int lpc32xx_nand_read_page_syndrome(struct mtd_info *mtd,
 	lpc32xx_slc_ecc_copy(tmpecc, (uint32_t *) host->ecc_buf, chip->ecc.steps);
 
 	/* Pointer to ECC data retrieved from NAND spare area */
-	oobecc = chip->oob_poi + chip->ecc.layout->eccpos[0];
+	error = mtd_ooblayout_ecc(mtd, 0, &oobregion);
+	if (error)
+		return error;
+
+	oobecc = chip->oob_poi + oobregion.offset;
 
 	for (i = 0; i < chip->ecc.steps; i++) {
 		stat = chip->ecc.correct(mtd, buf, oobecc,
@@ -666,7 +671,8 @@ static int lpc32xx_nand_write_page_syndrome(struct mtd_info *mtd,
 					    int oob_required, int page)
 {
 	struct lpc32xx_nand_host *host = nand_get_controller_data(chip);
-	uint8_t *pb = chip->oob_poi + chip->ecc.layout->eccpos[0];
+	struct mtd_oob_region oobregion = { };
+	uint8_t *pb;
 	int error;
 
 	/* Write data, calculate ECC on outbound data */
@@ -678,6 +684,11 @@ static int lpc32xx_nand_write_page_syndrome(struct mtd_info *mtd,
 	 * The calculated ECC needs some manual work done to it before
 	 * committing it to NAND. Process the calculated ECC and place
 	 * the resultant values directly into the OOB buffer. */
+	error = mtd_ooblayout_ecc(mtd, 0, &oobregion);
+	if (error)
+		return error;
+
+	pb = chip->oob_poi + oobregion.offset;
 	lpc32xx_slc_ecc_copy(pb, (uint32_t *)host->ecc_buf, chip->ecc.steps);
 
 	/* Write ECC data to device */
-- 
2.5.0

[PATCH v5 07/50] mtd: nand: lpc32xx: use mtd_ooblayout_xxx() helpers where appropriate

[Boris Brezillon]

The mtd_ooblayout_xxx() helper functions have been added to avoid direct
accesses to the ecclayout field, and thus ease for future reworks.
Use these helpers in all places where the oobfree[] and eccpos[] arrays
where directly accessed.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/mtd/nand/lpc32xx_slc.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/mtd/nand/lpc32xx_slc.c b/drivers/mtd/nand/lpc32xx_slc.c
index 3b8f373..10cf8e62 100644
--- a/drivers/mtd/nand/lpc32xx_slc.c
+++ b/drivers/mtd/nand/lpc32xx_slc.c
@@ -604,7 +604,8 @@ static int lpc32xx_nand_read_page_syndrome(struct mtd_info *mtd,
 					   int oob_required, int page)
 {
 	struct lpc32xx_nand_host *host = nand_get_controller_data(chip);
-	int stat, i, status;
+	struct mtd_oob_region oobregion = { };
+	int stat, i, status, error;
 	uint8_t *oobecc, tmpecc[LPC32XX_ECC_SAVE_SIZE];
 
 	/* Issue read command */
@@ -620,7 +621,11 @@ static int lpc32xx_nand_read_page_syndrome(struct mtd_info *mtd,
 	lpc32xx_slc_ecc_copy(tmpecc, (uint32_t *) host->ecc_buf, chip->ecc.steps);
 
 	/* Pointer to ECC data retrieved from NAND spare area */
-	oobecc = chip->oob_poi + chip->ecc.layout->eccpos[0];
+	error = mtd_ooblayout_ecc(mtd, 0, &oobregion);
+	if (error)
+		return error;
+
+	oobecc = chip->oob_poi + oobregion.offset;
 
 	for (i = 0; i < chip->ecc.steps; i++) {
 		stat = chip->ecc.correct(mtd, buf, oobecc,
@@ -666,7 +671,8 @@ static int lpc32xx_nand_write_page_syndrome(struct mtd_info *mtd,
 					    int oob_required, int page)
 {
 	struct lpc32xx_nand_host *host = nand_get_controller_data(chip);
-	uint8_t *pb = chip->oob_poi + chip->ecc.layout->eccpos[0];
+	struct mtd_oob_region oobregion = { };
+	uint8_t *pb;
 	int error;
 
 	/* Write data, calculate ECC on outbound data */
@@ -678,6 +684,11 @@ static int lpc32xx_nand_write_page_syndrome(struct mtd_info *mtd,
 	 * The calculated ECC needs some manual work done to it before
 	 * committing it to NAND. Process the calculated ECC and place
 	 * the resultant values directly into the OOB buffer. */
+	error = mtd_ooblayout_ecc(mtd, 0, &oobregion);
+	if (error)
+		return error;
+
+	pb = chip->oob_poi + oobregion.offset;
 	lpc32xx_slc_ecc_copy(pb, (uint32_t *)host->ecc_buf, chip->ecc.steps);
 
 	/* Write ECC data to device */
-- 
2.5.0

[PATCH v5 07/50] mtd: nand: lpc32xx: use mtd_ooblayout_xxx() helpers where appropriate

[Boris Brezillon]

The mtd_ooblayout_xxx() helper functions have been added to avoid direct
accesses to the ecclayout field, and thus ease for future reworks.
Use these helpers in all places where the oobfree[] and eccpos[] arrays
where directly accessed.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/lpc32xx_slc.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/mtd/nand/lpc32xx_slc.c b/drivers/mtd/nand/lpc32xx_slc.c
index 3b8f373..10cf8e62 100644
--- a/drivers/mtd/nand/lpc32xx_slc.c
+++ b/drivers/mtd/nand/lpc32xx_slc.c
@@ -604,7 +604,8 @@ static int lpc32xx_nand_read_page_syndrome(struct mtd_info *mtd,
 					   int oob_required, int page)
 {
 	struct lpc32xx_nand_host *host = nand_get_controller_data(chip);
-	int stat, i, status;
+	struct mtd_oob_region oobregion = { };
+	int stat, i, status, error;
 	uint8_t *oobecc, tmpecc[LPC32XX_ECC_SAVE_SIZE];
 
 	/* Issue read command */
@@ -620,7 +621,11 @@ static int lpc32xx_nand_read_page_syndrome(struct mtd_info *mtd,
 	lpc32xx_slc_ecc_copy(tmpecc, (uint32_t *) host->ecc_buf, chip->ecc.steps);
 
 	/* Pointer to ECC data retrieved from NAND spare area */
-	oobecc = chip->oob_poi + chip->ecc.layout->eccpos[0];
+	error = mtd_ooblayout_ecc(mtd, 0, &oobregion);
+	if (error)
+		return error;
+
+	oobecc = chip->oob_poi + oobregion.offset;
 
 	for (i = 0; i < chip->ecc.steps; i++) {
 		stat = chip->ecc.correct(mtd, buf, oobecc,
@@ -666,7 +671,8 @@ static int lpc32xx_nand_write_page_syndrome(struct mtd_info *mtd,
 					    int oob_required, int page)
 {
 	struct lpc32xx_nand_host *host = nand_get_controller_data(chip);
-	uint8_t *pb = chip->oob_poi + chip->ecc.layout->eccpos[0];
+	struct mtd_oob_region oobregion = { };
+	uint8_t *pb;
 	int error;
 
 	/* Write data, calculate ECC on outbound data */
@@ -678,6 +684,11 @@ static int lpc32xx_nand_write_page_syndrome(struct mtd_info *mtd,
 	 * The calculated ECC needs some manual work done to it before
 	 * committing it to NAND. Process the calculated ECC and place
 	 * the resultant values directly into the OOB buffer. */
+	error = mtd_ooblayout_ecc(mtd, 0, &oobregion);
+	if (error)
+		return error;
+
+	pb = chip->oob_poi + oobregion.offset;
 	lpc32xx_slc_ecc_copy(pb, (uint32_t *)host->ecc_buf, chip->ecc.steps);
 
 	/* Write ECC data to device */
-- 
2.5.0

[PATCH v5 08/50] mtd: nand: omap2: use mtd_ooblayout_xxx() helpers where appropriate

[Boris Brezillon]

The mtd_ooblayout_xxx() helper functions have been added to avoid direct
accesses to the ecclayout field, and thus ease for future reworks.
Use these helpers in all places where the oobfree[] and eccpos[] arrays
where directly accessed.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/omap2.c | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index 0749ca1..4ebf16b 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -1495,9 +1495,8 @@ static int omap_elm_correct_data(struct mtd_info *mtd, u_char *data,
 static int omap_write_page_bch(struct mtd_info *mtd, struct nand_chip *chip,
 			       const uint8_t *buf, int oob_required, int page)
 {
-	int i;
+	int ret;
 	uint8_t *ecc_calc = chip->buffers->ecccalc;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
 
 	/* Enable GPMC ecc engine */
 	chip->ecc.hwctl(mtd, NAND_ECC_WRITE);
@@ -1508,8 +1507,10 @@ static int omap_write_page_bch(struct mtd_info *mtd, struct nand_chip *chip,
 	/* Update ecc vector from GPMC result registers */
 	chip->ecc.calculate(mtd, buf, &ecc_calc[0]);
 
-	for (i = 0; i < chip->ecc.total; i++)
-		chip->oob_poi[eccpos[i]] = ecc_calc[i];
+	ret = mtd_ooblayout_set_eccbytes(mtd, ecc_calc, chip->oob_poi, 0,
+					 chip->ecc.total);
+	if (ret)
+		return ret;
 
 	/* Write ecc vector to OOB area */
 	chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
@@ -1536,10 +1537,7 @@ static int omap_read_page_bch(struct mtd_info *mtd, struct nand_chip *chip,
 {
 	uint8_t *ecc_calc = chip->buffers->ecccalc;
 	uint8_t *ecc_code = chip->buffers->ecccode;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
-	uint8_t *oob = &chip->oob_poi[eccpos[0]];
-	uint32_t oob_pos = mtd->writesize + chip->ecc.layout->eccpos[0];
-	int stat;
+	int stat, ret;
 	unsigned int max_bitflips = 0;
 
 	/* Enable GPMC ecc engine */
@@ -1549,13 +1547,16 @@ static int omap_read_page_bch(struct mtd_info *mtd, struct nand_chip *chip,
 	chip->read_buf(mtd, buf, mtd->writesize);
 
 	/* Read oob bytes */
-	chip->cmdfunc(mtd, NAND_CMD_RNDOUT, oob_pos, -1);
-	chip->read_buf(mtd, oob, chip->ecc.total);
+	chip->cmdfunc(mtd, NAND_CMD_RNDOUT, mtd->writesize, -1);
+	chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
 
 	/* Calculate ecc bytes */
 	chip->ecc.calculate(mtd, buf, ecc_calc);
 
-	memcpy(ecc_code, &chip->oob_poi[eccpos[0]], chip->ecc.total);
+	ret = mtd_ooblayout_get_eccbytes(mtd, ecc_code, chip->oob_poi, 0,
+					 chip->ecc.total);
+	if (ret)
+		return ret;
 
 	stat = chip->ecc.correct(mtd, buf, ecc_code, ecc_calc);
 
-- 
2.5.0

[PATCH v5 08/50] mtd: nand: omap2: use mtd_ooblayout_xxx() helpers where appropriate

[Boris Brezillon]

The mtd_ooblayout_xxx() helper functions have been added to avoid direct
accesses to the ecclayout field, and thus ease for future reworks.
Use these helpers in all places where the oobfree[] and eccpos[] arrays
where directly accessed.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/mtd/nand/omap2.c | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index 0749ca1..4ebf16b 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -1495,9 +1495,8 @@ static int omap_elm_correct_data(struct mtd_info *mtd, u_char *data,
 static int omap_write_page_bch(struct mtd_info *mtd, struct nand_chip *chip,
 			       const uint8_t *buf, int oob_required, int page)
 {
-	int i;
+	int ret;
 	uint8_t *ecc_calc = chip->buffers->ecccalc;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
 
 	/* Enable GPMC ecc engine */
 	chip->ecc.hwctl(mtd, NAND_ECC_WRITE);
@@ -1508,8 +1507,10 @@ static int omap_write_page_bch(struct mtd_info *mtd, struct nand_chip *chip,
 	/* Update ecc vector from GPMC result registers */
 	chip->ecc.calculate(mtd, buf, &ecc_calc[0]);
 
-	for (i = 0; i < chip->ecc.total; i++)
-		chip->oob_poi[eccpos[i]] = ecc_calc[i];
+	ret = mtd_ooblayout_set_eccbytes(mtd, ecc_calc, chip->oob_poi, 0,
+					 chip->ecc.total);
+	if (ret)
+		return ret;
 
 	/* Write ecc vector to OOB area */
 	chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
@@ -1536,10 +1537,7 @@ static int omap_read_page_bch(struct mtd_info *mtd, struct nand_chip *chip,
 {
 	uint8_t *ecc_calc = chip->buffers->ecccalc;
 	uint8_t *ecc_code = chip->buffers->ecccode;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
-	uint8_t *oob = &chip->oob_poi[eccpos[0]];
-	uint32_t oob_pos = mtd->writesize + chip->ecc.layout->eccpos[0];
-	int stat;
+	int stat, ret;
 	unsigned int max_bitflips = 0;
 
 	/* Enable GPMC ecc engine */
@@ -1549,13 +1547,16 @@ static int omap_read_page_bch(struct mtd_info *mtd, struct nand_chip *chip,
 	chip->read_buf(mtd, buf, mtd->writesize);
 
 	/* Read oob bytes */
-	chip->cmdfunc(mtd, NAND_CMD_RNDOUT, oob_pos, -1);
-	chip->read_buf(mtd, oob, chip->ecc.total);
+	chip->cmdfunc(mtd, NAND_CMD_RNDOUT, mtd->writesize, -1);
+	chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
 
 	/* Calculate ecc bytes */
 	chip->ecc.calculate(mtd, buf, ecc_calc);
 
-	memcpy(ecc_code, &chip->oob_poi[eccpos[0]], chip->ecc.total);
+	ret = mtd_ooblayout_get_eccbytes(mtd, ecc_code, chip->oob_poi, 0,
+					 chip->ecc.total);
+	if (ret)
+		return ret;
 
 	stat = chip->ecc.correct(mtd, buf, ecc_code, ecc_calc);
 
-- 
2.5.0

[PATCH v5 08/50] mtd: nand: omap2: use mtd_ooblayout_xxx() helpers where appropriate

[Boris Brezillon]

The mtd_ooblayout_xxx() helper functions have been added to avoid direct
accesses to the ecclayout field, and thus ease for future reworks.
Use these helpers in all places where the oobfree[] and eccpos[] arrays
where directly accessed.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/omap2.c | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index 0749ca1..4ebf16b 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -1495,9 +1495,8 @@ static int omap_elm_correct_data(struct mtd_info *mtd, u_char *data,
 static int omap_write_page_bch(struct mtd_info *mtd, struct nand_chip *chip,
 			       const uint8_t *buf, int oob_required, int page)
 {
-	int i;
+	int ret;
 	uint8_t *ecc_calc = chip->buffers->ecccalc;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
 
 	/* Enable GPMC ecc engine */
 	chip->ecc.hwctl(mtd, NAND_ECC_WRITE);
@@ -1508,8 +1507,10 @@ static int omap_write_page_bch(struct mtd_info *mtd, struct nand_chip *chip,
 	/* Update ecc vector from GPMC result registers */
 	chip->ecc.calculate(mtd, buf, &ecc_calc[0]);
 
-	for (i = 0; i < chip->ecc.total; i++)
-		chip->oob_poi[eccpos[i]] = ecc_calc[i];
+	ret = mtd_ooblayout_set_eccbytes(mtd, ecc_calc, chip->oob_poi, 0,
+					 chip->ecc.total);
+	if (ret)
+		return ret;
 
 	/* Write ecc vector to OOB area */
 	chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
@@ -1536,10 +1537,7 @@ static int omap_read_page_bch(struct mtd_info *mtd, struct nand_chip *chip,
 {
 	uint8_t *ecc_calc = chip->buffers->ecccalc;
 	uint8_t *ecc_code = chip->buffers->ecccode;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
-	uint8_t *oob = &chip->oob_poi[eccpos[0]];
-	uint32_t oob_pos = mtd->writesize + chip->ecc.layout->eccpos[0];
-	int stat;
+	int stat, ret;
 	unsigned int max_bitflips = 0;
 
 	/* Enable GPMC ecc engine */
@@ -1549,13 +1547,16 @@ static int omap_read_page_bch(struct mtd_info *mtd, struct nand_chip *chip,
 	chip->read_buf(mtd, buf, mtd->writesize);
 
 	/* Read oob bytes */
-	chip->cmdfunc(mtd, NAND_CMD_RNDOUT, oob_pos, -1);
-	chip->read_buf(mtd, oob, chip->ecc.total);
+	chip->cmdfunc(mtd, NAND_CMD_RNDOUT, mtd->writesize, -1);
+	chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
 
 	/* Calculate ecc bytes */
 	chip->ecc.calculate(mtd, buf, ecc_calc);
 
-	memcpy(ecc_code, &chip->oob_poi[eccpos[0]], chip->ecc.total);
+	ret = mtd_ooblayout_get_eccbytes(mtd, ecc_code, chip->oob_poi, 0,
+					 chip->ecc.total);
+	if (ret)
+		return ret;
 
 	stat = chip->ecc.correct(mtd, buf, ecc_code, ecc_calc);
 
-- 
2.5.0

[PATCH v5 09/50] mtd: nand: qcom: use mtd_ooblayout_xxx() helpers where appropriate

[Boris Brezillon]

The mtd_ooblayout_xxx() helper functions have been added to avoid direct
accesses to ecclayout fields, and thus ease for future reworks.
Use these helpers in all places where the oobfree[] and eccpos[] arrays
where directly accessed.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Tested-by: Archit Taneja <architt@codeaurora.org>
---
 drivers/mtd/nand/qcom_nandc.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/mtd/nand/qcom_nandc.c b/drivers/mtd/nand/qcom_nandc.c
index f550a57..012c202 100644
--- a/drivers/mtd/nand/qcom_nandc.c
+++ b/drivers/mtd/nand/qcom_nandc.c
@@ -1437,7 +1437,6 @@ static int qcom_nandc_write_oob(struct mtd_info *mtd, struct nand_chip *chip,
 	struct qcom_nand_controller *nandc = get_qcom_nand_controller(chip);
 	struct nand_ecc_ctrl *ecc = &chip->ecc;
 	u8 *oob = chip->oob_poi;
-	int free_boff;
 	int data_size, oob_size;
 	int ret, status = 0;
 
@@ -1451,12 +1450,11 @@ static int qcom_nandc_write_oob(struct mtd_info *mtd, struct nand_chip *chip,
 
 	/* calculate the data and oob size for the last codeword/step */
 	data_size = ecc->size - ((ecc->steps - 1) << 2);
-	oob_size = ecc->steps << 2;
-
-	free_boff = ecc->layout->oobfree[0].offset;
+	oob_size = mtd->oobavail;
 
 	/* override new oob content to last codeword */
-	memcpy(nandc->data_buffer + data_size, oob + free_boff, oob_size);
+	mtd_ooblayout_get_databytes(mtd, nandc->data_buffer + data_size, oob,
+				    0, mtd->oobavail);
 
 	set_address(host, host->cw_size * (ecc->steps - 1), page);
 	update_rw_regs(host, 1, false);
-- 
2.5.0

[PATCH v5 09/50] mtd: nand: qcom: use mtd_ooblayout_xxx() helpers where appropriate

[Boris Brezillon]

The mtd_ooblayout_xxx() helper functions have been added to avoid direct
accesses to ecclayout fields, and thus ease for future reworks.
Use these helpers in all places where the oobfree[] and eccpos[] arrays
where directly accessed.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
Tested-by: Archit Taneja <architt-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
---
 drivers/mtd/nand/qcom_nandc.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/mtd/nand/qcom_nandc.c b/drivers/mtd/nand/qcom_nandc.c
index f550a57..012c202 100644
--- a/drivers/mtd/nand/qcom_nandc.c
+++ b/drivers/mtd/nand/qcom_nandc.c
@@ -1437,7 +1437,6 @@ static int qcom_nandc_write_oob(struct mtd_info *mtd, struct nand_chip *chip,
 	struct qcom_nand_controller *nandc = get_qcom_nand_controller(chip);
 	struct nand_ecc_ctrl *ecc = &chip->ecc;
 	u8 *oob = chip->oob_poi;
-	int free_boff;
 	int data_size, oob_size;
 	int ret, status = 0;
 
@@ -1451,12 +1450,11 @@ static int qcom_nandc_write_oob(struct mtd_info *mtd, struct nand_chip *chip,
 
 	/* calculate the data and oob size for the last codeword/step */
 	data_size = ecc->size - ((ecc->steps - 1) << 2);
-	oob_size = ecc->steps << 2;
-
-	free_boff = ecc->layout->oobfree[0].offset;
+	oob_size = mtd->oobavail;
 
 	/* override new oob content to last codeword */
-	memcpy(nandc->data_buffer + data_size, oob + free_boff, oob_size);
+	mtd_ooblayout_get_databytes(mtd, nandc->data_buffer + data_size, oob,
+				    0, mtd->oobavail);
 
 	set_address(host, host->cw_size * (ecc->steps - 1), page);
 	update_rw_regs(host, 1, false);
-- 
2.5.0

[PATCH v5 09/50] mtd: nand: qcom: use mtd_ooblayout_xxx() helpers where appropriate

[Boris Brezillon]

The mtd_ooblayout_xxx() helper functions have been added to avoid direct
accesses to ecclayout fields, and thus ease for future reworks.
Use these helpers in all places where the oobfree[] and eccpos[] arrays
where directly accessed.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Tested-by: Archit Taneja <architt@codeaurora.org>
---
 drivers/mtd/nand/qcom_nandc.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/mtd/nand/qcom_nandc.c b/drivers/mtd/nand/qcom_nandc.c
index f550a57..012c202 100644
--- a/drivers/mtd/nand/qcom_nandc.c
+++ b/drivers/mtd/nand/qcom_nandc.c
@@ -1437,7 +1437,6 @@ static int qcom_nandc_write_oob(struct mtd_info *mtd, struct nand_chip *chip,
 	struct qcom_nand_controller *nandc = get_qcom_nand_controller(chip);
 	struct nand_ecc_ctrl *ecc = &chip->ecc;
 	u8 *oob = chip->oob_poi;
-	int free_boff;
 	int data_size, oob_size;
 	int ret, status = 0;
 
@@ -1451,12 +1450,11 @@ static int qcom_nandc_write_oob(struct mtd_info *mtd, struct nand_chip *chip,
 
 	/* calculate the data and oob size for the last codeword/step */
 	data_size = ecc->size - ((ecc->steps - 1) << 2);
-	oob_size = ecc->steps << 2;
-
-	free_boff = ecc->layout->oobfree[0].offset;
+	oob_size = mtd->oobavail;
 
 	/* override new oob content to last codeword */
-	memcpy(nandc->data_buffer + data_size, oob + free_boff, oob_size);
+	mtd_ooblayout_get_databytes(mtd, nandc->data_buffer + data_size, oob,
+				    0, mtd->oobavail);
 
 	set_address(host, host->cw_size * (ecc->steps - 1), page);
 	update_rw_regs(host, 1, false);
-- 
2.5.0

[PATCH v5 10/50] mtd: onenand: use mtd_ooblayout_xxx() helpers where appropriate

[Boris Brezillon]

The mtd_ooblayout_xxx() helper functions have been added to avoid direct
accesses to the ecclayout field, and thus ease for future reworks.
Use these helpers in all places where the oobfree[] and eccpos[] arrays
where directly accessed.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/onenand/onenand_base.c | 75 ++++++++------------------------------
 1 file changed, 15 insertions(+), 60 deletions(-)

diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
index af28bb3..20fdf8c 100644
--- a/drivers/mtd/onenand/onenand_base.c
+++ b/drivers/mtd/onenand/onenand_base.c
@@ -1024,34 +1024,15 @@ static int onenand_transfer_auto_oob(struct mtd_info *mtd, uint8_t *buf, int col
 				int thislen)
 {
 	struct onenand_chip *this = mtd->priv;
-	struct nand_oobfree *free;
-	int readcol = column;
-	int readend = column + thislen;
-	int lastgap = 0;
-	unsigned int i;
-	uint8_t *oob_buf = this->oob_buf;
-
-	free = this->ecclayout->oobfree;
-	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
-		if (readcol >= lastgap)
-			readcol += free->offset - lastgap;
-		if (readend >= lastgap)
-			readend += free->offset - lastgap;
-		lastgap = free->offset + free->length;
-	}
-	this->read_bufferram(mtd, ONENAND_SPARERAM, oob_buf, 0, mtd->oobsize);
-	free = this->ecclayout->oobfree;
-	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
-		int free_end = free->offset + free->length;
-		if (free->offset < readend && free_end > readcol) {
-			int st = max_t(int,free->offset,readcol);
-			int ed = min_t(int,free_end,readend);
-			int n = ed - st;
-			memcpy(buf, oob_buf + st, n);
-			buf += n;
-		} else if (column == 0)
-			break;
-	}
+	int ret;
+
+	this->read_bufferram(mtd, ONENAND_SPARERAM, this->oob_buf, 0,
+			     mtd->oobsize);
+	ret = mtd_ooblayout_get_databytes(mtd, buf, this->oob_buf,
+					  column, thislen);
+	if (ret)
+		return ret;
+
 	return 0;
 }
 
@@ -1808,34 +1789,7 @@ static int onenand_panic_write(struct mtd_info *mtd, loff_t to, size_t len,
 static int onenand_fill_auto_oob(struct mtd_info *mtd, u_char *oob_buf,
 				  const u_char *buf, int column, int thislen)
 {
-	struct onenand_chip *this = mtd->priv;
-	struct nand_oobfree *free;
-	int writecol = column;
-	int writeend = column + thislen;
-	int lastgap = 0;
-	unsigned int i;
-
-	free = this->ecclayout->oobfree;
-	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
-		if (writecol >= lastgap)
-			writecol += free->offset - lastgap;
-		if (writeend >= lastgap)
-			writeend += free->offset - lastgap;
-		lastgap = free->offset + free->length;
-	}
-	free = this->ecclayout->oobfree;
-	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
-		int free_end = free->offset + free->length;
-		if (free->offset < writeend && free_end > writecol) {
-			int st = max_t(int,free->offset,writecol);
-			int ed = min_t(int,free_end,writeend);
-			int n = ed - st;
-			memcpy(oob_buf + st, buf, n);
-			buf += n;
-		} else if (column == 0)
-			break;
-	}
-	return 0;
+	return mtd_ooblayout_set_databytes(mtd, buf, oob_buf, column, thislen);
 }
 
 /**
@@ -4037,10 +3991,11 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
 	 * The number of bytes available for a client to place data into
 	 * the out of band area
 	 */
-	mtd->oobavail = 0;
-	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES &&
-	    this->ecclayout->oobfree[i].length; i++)
-		mtd->oobavail += this->ecclayout->oobfree[i].length;
+	ret = mtd_ooblayout_count_freebytes(mtd);
+	if (ret < 0)
+		ret = 0;
+
+	mtd->oobavail = ret;
 
 	mtd->ecclayout = this->ecclayout;
 	mtd->ecc_strength = 1;
-- 
2.5.0

[PATCH v5 10/50] mtd: onenand: use mtd_ooblayout_xxx() helpers where appropriate

[Boris Brezillon]

The mtd_ooblayout_xxx() helper functions have been added to avoid direct
accesses to the ecclayout field, and thus ease for future reworks.
Use these helpers in all places where the oobfree[] and eccpos[] arrays
where directly accessed.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/mtd/onenand/onenand_base.c | 75 ++++++++------------------------------
 1 file changed, 15 insertions(+), 60 deletions(-)

diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
index af28bb3..20fdf8c 100644
--- a/drivers/mtd/onenand/onenand_base.c
+++ b/drivers/mtd/onenand/onenand_base.c
@@ -1024,34 +1024,15 @@ static int onenand_transfer_auto_oob(struct mtd_info *mtd, uint8_t *buf, int col
 				int thislen)
 {
 	struct onenand_chip *this = mtd->priv;
-	struct nand_oobfree *free;
-	int readcol = column;
-	int readend = column + thislen;
-	int lastgap = 0;
-	unsigned int i;
-	uint8_t *oob_buf = this->oob_buf;
-
-	free = this->ecclayout->oobfree;
-	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
-		if (readcol >= lastgap)
-			readcol += free->offset - lastgap;
-		if (readend >= lastgap)
-			readend += free->offset - lastgap;
-		lastgap = free->offset + free->length;
-	}
-	this->read_bufferram(mtd, ONENAND_SPARERAM, oob_buf, 0, mtd->oobsize);
-	free = this->ecclayout->oobfree;
-	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
-		int free_end = free->offset + free->length;
-		if (free->offset < readend && free_end > readcol) {
-			int st = max_t(int,free->offset,readcol);
-			int ed = min_t(int,free_end,readend);
-			int n = ed - st;
-			memcpy(buf, oob_buf + st, n);
-			buf += n;
-		} else if (column == 0)
-			break;
-	}
+	int ret;
+
+	this->read_bufferram(mtd, ONENAND_SPARERAM, this->oob_buf, 0,
+			     mtd->oobsize);
+	ret = mtd_ooblayout_get_databytes(mtd, buf, this->oob_buf,
+					  column, thislen);
+	if (ret)
+		return ret;
+
 	return 0;
 }
 
@@ -1808,34 +1789,7 @@ static int onenand_panic_write(struct mtd_info *mtd, loff_t to, size_t len,
 static int onenand_fill_auto_oob(struct mtd_info *mtd, u_char *oob_buf,
 				  const u_char *buf, int column, int thislen)
 {
-	struct onenand_chip *this = mtd->priv;
-	struct nand_oobfree *free;
-	int writecol = column;
-	int writeend = column + thislen;
-	int lastgap = 0;
-	unsigned int i;
-
-	free = this->ecclayout->oobfree;
-	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
-		if (writecol >= lastgap)
-			writecol += free->offset - lastgap;
-		if (writeend >= lastgap)
-			writeend += free->offset - lastgap;
-		lastgap = free->offset + free->length;
-	}
-	free = this->ecclayout->oobfree;
-	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
-		int free_end = free->offset + free->length;
-		if (free->offset < writeend && free_end > writecol) {
-			int st = max_t(int,free->offset,writecol);
-			int ed = min_t(int,free_end,writeend);
-			int n = ed - st;
-			memcpy(oob_buf + st, buf, n);
-			buf += n;
-		} else if (column == 0)
-			break;
-	}
-	return 0;
+	return mtd_ooblayout_set_databytes(mtd, buf, oob_buf, column, thislen);
 }
 
 /**
@@ -4037,10 +3991,11 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
 	 * The number of bytes available for a client to place data into
 	 * the out of band area
 	 */
-	mtd->oobavail = 0;
-	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES &&
-	    this->ecclayout->oobfree[i].length; i++)
-		mtd->oobavail += this->ecclayout->oobfree[i].length;
+	ret = mtd_ooblayout_count_freebytes(mtd);
+	if (ret < 0)
+		ret = 0;
+
+	mtd->oobavail = ret;
 
 	mtd->ecclayout = this->ecclayout;
 	mtd->ecc_strength = 1;
-- 
2.5.0

[PATCH v5 10/50] mtd: onenand: use mtd_ooblayout_xxx() helpers where appropriate

[Boris Brezillon]

The mtd_ooblayout_xxx() helper functions have been added to avoid direct
accesses to the ecclayout field, and thus ease for future reworks.
Use these helpers in all places where the oobfree[] and eccpos[] arrays
where directly accessed.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/onenand/onenand_base.c | 75 ++++++++------------------------------
 1 file changed, 15 insertions(+), 60 deletions(-)

diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
index af28bb3..20fdf8c 100644
--- a/drivers/mtd/onenand/onenand_base.c
+++ b/drivers/mtd/onenand/onenand_base.c
@@ -1024,34 +1024,15 @@ static int onenand_transfer_auto_oob(struct mtd_info *mtd, uint8_t *buf, int col
 				int thislen)
 {
 	struct onenand_chip *this = mtd->priv;
-	struct nand_oobfree *free;
-	int readcol = column;
-	int readend = column + thislen;
-	int lastgap = 0;
-	unsigned int i;
-	uint8_t *oob_buf = this->oob_buf;
-
-	free = this->ecclayout->oobfree;
-	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
-		if (readcol >= lastgap)
-			readcol += free->offset - lastgap;
-		if (readend >= lastgap)
-			readend += free->offset - lastgap;
-		lastgap = free->offset + free->length;
-	}
-	this->read_bufferram(mtd, ONENAND_SPARERAM, oob_buf, 0, mtd->oobsize);
-	free = this->ecclayout->oobfree;
-	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
-		int free_end = free->offset + free->length;
-		if (free->offset < readend && free_end > readcol) {
-			int st = max_t(int,free->offset,readcol);
-			int ed = min_t(int,free_end,readend);
-			int n = ed - st;
-			memcpy(buf, oob_buf + st, n);
-			buf += n;
-		} else if (column == 0)
-			break;
-	}
+	int ret;
+
+	this->read_bufferram(mtd, ONENAND_SPARERAM, this->oob_buf, 0,
+			     mtd->oobsize);
+	ret = mtd_ooblayout_get_databytes(mtd, buf, this->oob_buf,
+					  column, thislen);
+	if (ret)
+		return ret;
+
 	return 0;
 }
 
@@ -1808,34 +1789,7 @@ static int onenand_panic_write(struct mtd_info *mtd, loff_t to, size_t len,
 static int onenand_fill_auto_oob(struct mtd_info *mtd, u_char *oob_buf,
 				  const u_char *buf, int column, int thislen)
 {
-	struct onenand_chip *this = mtd->priv;
-	struct nand_oobfree *free;
-	int writecol = column;
-	int writeend = column + thislen;
-	int lastgap = 0;
-	unsigned int i;
-
-	free = this->ecclayout->oobfree;
-	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
-		if (writecol >= lastgap)
-			writecol += free->offset - lastgap;
-		if (writeend >= lastgap)
-			writeend += free->offset - lastgap;
-		lastgap = free->offset + free->length;
-	}
-	free = this->ecclayout->oobfree;
-	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
-		int free_end = free->offset + free->length;
-		if (free->offset < writeend && free_end > writecol) {
-			int st = max_t(int,free->offset,writecol);
-			int ed = min_t(int,free_end,writeend);
-			int n = ed - st;
-			memcpy(oob_buf + st, buf, n);
-			buf += n;
-		} else if (column == 0)
-			break;
-	}
-	return 0;
+	return mtd_ooblayout_set_databytes(mtd, buf, oob_buf, column, thislen);
 }
 
 /**
@@ -4037,10 +3991,11 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
 	 * The number of bytes available for a client to place data into
 	 * the out of band area
 	 */
-	mtd->oobavail = 0;
-	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES &&
-	    this->ecclayout->oobfree[i].length; i++)
-		mtd->oobavail += this->ecclayout->oobfree[i].length;
+	ret = mtd_ooblayout_count_freebytes(mtd);
+	if (ret < 0)
+		ret = 0;
+
+	mtd->oobavail = ret;
 
 	mtd->ecclayout = this->ecclayout;
 	mtd->ecc_strength = 1;
-- 
2.5.0

[PATCH v5 11/50] mtd: add mtd_set_ecclayout() helper function

[Boris Brezillon]

Add an mtd_set_ecclayout() helper function to avoid direct accesses to the
mtd->ecclayout field. This will ease future reworks of ECC layout
definition.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 include/linux/mtd/mtd.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index b141f26..6250dd8 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -286,6 +286,12 @@ int mtd_ooblayout_set_databytes(struct mtd_info *mtd, const u8 *databuf,
 int mtd_ooblayout_count_freebytes(struct mtd_info *mtd);
 int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd);
 
+static inline void mtd_set_ecclayout(struct mtd_info *mtd,
+				     struct nand_ecclayout *ecclayout)
+{
+	mtd->ecclayout = ecclayout;
+}
+
 static inline void mtd_set_of_node(struct mtd_info *mtd,
 				   struct device_node *np)
 {
-- 
2.5.0

[PATCH v5 11/50] mtd: add mtd_set_ecclayout() helper function

[Boris Brezillon]

Add an mtd_set_ecclayout() helper function to avoid direct accesses to the
mtd->ecclayout field. This will ease future reworks of ECC layout
definition.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 include/linux/mtd/mtd.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index b141f26..6250dd8 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -286,6 +286,12 @@ int mtd_ooblayout_set_databytes(struct mtd_info *mtd, const u8 *databuf,
 int mtd_ooblayout_count_freebytes(struct mtd_info *mtd);
 int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd);
 
+static inline void mtd_set_ecclayout(struct mtd_info *mtd,
+				     struct nand_ecclayout *ecclayout)
+{
+	mtd->ecclayout = ecclayout;
+}
+
 static inline void mtd_set_of_node(struct mtd_info *mtd,
 				   struct device_node *np)
 {
-- 
2.5.0

[PATCH v5 11/50] mtd: add mtd_set_ecclayout() helper function

[Boris Brezillon]

Add an mtd_set_ecclayout() helper function to avoid direct accesses to the
mtd->ecclayout field. This will ease future reworks of ECC layout
definition.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 include/linux/mtd/mtd.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index b141f26..6250dd8 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -286,6 +286,12 @@ int mtd_ooblayout_set_databytes(struct mtd_info *mtd, const u8 *databuf,
 int mtd_ooblayout_count_freebytes(struct mtd_info *mtd);
 int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd);
 
+static inline void mtd_set_ecclayout(struct mtd_info *mtd,
+				     struct nand_ecclayout *ecclayout)
+{
+	mtd->ecclayout = ecclayout;
+}
+
 static inline void mtd_set_of_node(struct mtd_info *mtd,
 				   struct device_node *np)
 {
-- 
2.5.0

[PATCH v5 12/50] mtd: use mtd_set_ecclayout() where appropriate

[Boris Brezillon]

Use the mtd_set_ecclayout() helper instead of directly assigning the
mtd->ecclayout field.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/mtdconcat.c | 2 +-
 drivers/mtd/mtdpart.c   | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/mtdconcat.c b/drivers/mtd/mtdconcat.c
index 239a8c8..481565e 100644
--- a/drivers/mtd/mtdconcat.c
+++ b/drivers/mtd/mtdconcat.c
@@ -777,7 +777,7 @@ struct mtd_info *mtd_concat_create(struct mtd_info *subdev[],	/* subdevices to c
 
 	}
 
-	concat->mtd.ecclayout = subdev[0]->ecclayout;
+	mtd_set_ecclayout(&concat->mtd, subdev[0]->ecclayout);
 
 	concat->num_subdev = num_devs;
 	concat->mtd.name = name;
diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
index 08de4b2..f53d9d7 100644
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -533,7 +533,7 @@ static struct mtd_part *allocate_partition(struct mtd_info *master,
 			part->name);
 	}
 
-	slave->mtd.ecclayout = master->ecclayout;
+	mtd_set_ecclayout(&slave->mtd, master->ecclayout);
 	slave->mtd.ecc_step_size = master->ecc_step_size;
 	slave->mtd.ecc_strength = master->ecc_strength;
 	slave->mtd.bitflip_threshold = master->bitflip_threshold;
-- 
2.5.0

[PATCH v5 12/50] mtd: use mtd_set_ecclayout() where appropriate

[Boris Brezillon]

Use the mtd_set_ecclayout() helper instead of directly assigning the
mtd->ecclayout field.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/mtd/mtdconcat.c | 2 +-
 drivers/mtd/mtdpart.c   | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/mtdconcat.c b/drivers/mtd/mtdconcat.c
index 239a8c8..481565e 100644
--- a/drivers/mtd/mtdconcat.c
+++ b/drivers/mtd/mtdconcat.c
@@ -777,7 +777,7 @@ struct mtd_info *mtd_concat_create(struct mtd_info *subdev[],	/* subdevices to c
 
 	}
 
-	concat->mtd.ecclayout = subdev[0]->ecclayout;
+	mtd_set_ecclayout(&concat->mtd, subdev[0]->ecclayout);
 
 	concat->num_subdev = num_devs;
 	concat->mtd.name = name;
diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
index 08de4b2..f53d9d7 100644
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -533,7 +533,7 @@ static struct mtd_part *allocate_partition(struct mtd_info *master,
 			part->name);
 	}
 
-	slave->mtd.ecclayout = master->ecclayout;
+	mtd_set_ecclayout(&slave->mtd, master->ecclayout);
 	slave->mtd.ecc_step_size = master->ecc_step_size;
 	slave->mtd.ecc_strength = master->ecc_strength;
 	slave->mtd.bitflip_threshold = master->bitflip_threshold;
-- 
2.5.0

[PATCH v5 12/50] mtd: use mtd_set_ecclayout() where appropriate

[Boris Brezillon]

Use the mtd_set_ecclayout() helper instead of directly assigning the
mtd->ecclayout field.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/mtdconcat.c | 2 +-
 drivers/mtd/mtdpart.c   | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/mtdconcat.c b/drivers/mtd/mtdconcat.c
index 239a8c8..481565e 100644
--- a/drivers/mtd/mtdconcat.c
+++ b/drivers/mtd/mtdconcat.c
@@ -777,7 +777,7 @@ struct mtd_info *mtd_concat_create(struct mtd_info *subdev[],	/* subdevices to c
 
 	}
 
-	concat->mtd.ecclayout = subdev[0]->ecclayout;
+	mtd_set_ecclayout(&concat->mtd, subdev[0]->ecclayout);
 
 	concat->num_subdev = num_devs;
 	concat->mtd.name = name;
diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
index 08de4b2..f53d9d7 100644
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -533,7 +533,7 @@ static struct mtd_part *allocate_partition(struct mtd_info *master,
 			part->name);
 	}
 
-	slave->mtd.ecclayout = master->ecclayout;
+	mtd_set_ecclayout(&slave->mtd, master->ecclayout);
 	slave->mtd.ecc_step_size = master->ecc_step_size;
 	slave->mtd.ecc_strength = master->ecc_strength;
 	slave->mtd.bitflip_threshold = master->bitflip_threshold;
-- 
2.5.0

[PATCH v5 13/50] mtd: nand: use mtd_set_ecclayout() where appropriate

[Boris Brezillon]

Use the mtd_set_ecclayout() helper instead of directly assigning the
mtd->ecclayout field.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/nand_base.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 36a58a0..295af79 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -4288,7 +4288,7 @@ int nand_scan_tail(struct mtd_info *mtd)
 		ecc->write_oob_raw = ecc->write_oob;
 
 	/* propagate ecc info to mtd_info */
-	mtd->ecclayout = ecc->layout;
+	mtd_set_ecclayout(mtd, ecc->layout);
 	mtd->ecc_strength = ecc->strength;
 	mtd->ecc_step_size = ecc->size;
 
-- 
2.5.0

[PATCH v5 13/50] mtd: nand: use mtd_set_ecclayout() where appropriate

[Boris Brezillon]

Use the mtd_set_ecclayout() helper instead of directly assigning the
mtd->ecclayout field.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/mtd/nand/nand_base.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 36a58a0..295af79 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -4288,7 +4288,7 @@ int nand_scan_tail(struct mtd_info *mtd)
 		ecc->write_oob_raw = ecc->write_oob;
 
 	/* propagate ecc info to mtd_info */
-	mtd->ecclayout = ecc->layout;
+	mtd_set_ecclayout(mtd, ecc->layout);
 	mtd->ecc_strength = ecc->strength;
 	mtd->ecc_step_size = ecc->size;
 
-- 
2.5.0

[PATCH v5 13/50] mtd: nand: use mtd_set_ecclayout() where appropriate

[Boris Brezillon]

Use the mtd_set_ecclayout() helper instead of directly assigning the
mtd->ecclayout field.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/nand_base.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 36a58a0..295af79 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -4288,7 +4288,7 @@ int nand_scan_tail(struct mtd_info *mtd)
 		ecc->write_oob_raw = ecc->write_oob;
 
 	/* propagate ecc info to mtd_info */
-	mtd->ecclayout = ecc->layout;
+	mtd_set_ecclayout(mtd, ecc->layout);
 	mtd->ecc_strength = ecc->strength;
 	mtd->ecc_step_size = ecc->size;
 
-- 
2.5.0

[PATCH v5 14/50] mtd: onenand: use mtd_set_ecclayout() where appropriate

[Boris Brezillon]

Use the mtd_set_ecclayout() helper instead of directly assigning the
mtd->ecclayout field.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/onenand/onenand_base.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
index 20fdf8c..d0fa505 100644
--- a/drivers/mtd/onenand/onenand_base.c
+++ b/drivers/mtd/onenand/onenand_base.c
@@ -3997,7 +3997,7 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
 
 	mtd->oobavail = ret;
 
-	mtd->ecclayout = this->ecclayout;
+	mtd_set_ecclayout(mtd, this->ecclayout);
 	mtd->ecc_strength = 1;
 
 	/* Fill in remaining MTD driver data */
-- 
2.5.0

[PATCH v5 14/50] mtd: onenand: use mtd_set_ecclayout() where appropriate

[Boris Brezillon]

Use the mtd_set_ecclayout() helper instead of directly assigning the
mtd->ecclayout field.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/mtd/onenand/onenand_base.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
index 20fdf8c..d0fa505 100644
--- a/drivers/mtd/onenand/onenand_base.c
+++ b/drivers/mtd/onenand/onenand_base.c
@@ -3997,7 +3997,7 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
 
 	mtd->oobavail = ret;
 
-	mtd->ecclayout = this->ecclayout;
+	mtd_set_ecclayout(mtd, this->ecclayout);
 	mtd->ecc_strength = 1;
 
 	/* Fill in remaining MTD driver data */
-- 
2.5.0

[PATCH v5 14/50] mtd: onenand: use mtd_set_ecclayout() where appropriate

[Boris Brezillon]

Use the mtd_set_ecclayout() helper instead of directly assigning the
mtd->ecclayout field.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/onenand/onenand_base.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
index 20fdf8c..d0fa505 100644
--- a/drivers/mtd/onenand/onenand_base.c
+++ b/drivers/mtd/onenand/onenand_base.c
@@ -3997,7 +3997,7 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
 
 	mtd->oobavail = ret;
 
-	mtd->ecclayout = this->ecclayout;
+	mtd_set_ecclayout(mtd, this->ecclayout);
 	mtd->ecc_strength = 1;
 
 	/* Fill in remaining MTD driver data */
-- 
2.5.0

[PATCH v5 15/50] mtd: docg3: use mtd_set_ecclayout() where appropriate

[Boris Brezillon]

Use the mtd_set_ecclayout() helper instead of directly assigning the
mtd->ecclayout field.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: Robert Jarzmik <robert.jarzmik@free.fr>
---
 drivers/mtd/devices/docg3.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/devices/docg3.c b/drivers/mtd/devices/docg3.c
index e7b2e43..6b516e1 100644
--- a/drivers/mtd/devices/docg3.c
+++ b/drivers/mtd/devices/docg3.c
@@ -1857,7 +1857,7 @@ static int __init doc_set_driver_info(int chip_id, struct mtd_info *mtd)
 	mtd->_read_oob = doc_read_oob;
 	mtd->_write_oob = doc_write_oob;
 	mtd->_block_isbad = doc_block_isbad;
-	mtd->ecclayout = &docg3_oobinfo;
+	mtd_set_ecclayout(mtd, &docg3_oobinfo);
 	mtd->oobavail = 8;
 	mtd->ecc_strength = DOC_ECC_BCH_T;
 
-- 
2.5.0

[PATCH v5 15/50] mtd: docg3: use mtd_set_ecclayout() where appropriate

[Boris Brezillon]

Use the mtd_set_ecclayout() helper instead of directly assigning the
mtd->ecclayout field.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
Acked-by: Robert Jarzmik <robert.jarzmik-GANU6spQydw@public.gmane.org>
---
 drivers/mtd/devices/docg3.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/devices/docg3.c b/drivers/mtd/devices/docg3.c
index e7b2e43..6b516e1 100644
--- a/drivers/mtd/devices/docg3.c
+++ b/drivers/mtd/devices/docg3.c
@@ -1857,7 +1857,7 @@ static int __init doc_set_driver_info(int chip_id, struct mtd_info *mtd)
 	mtd->_read_oob = doc_read_oob;
 	mtd->_write_oob = doc_write_oob;
 	mtd->_block_isbad = doc_block_isbad;
-	mtd->ecclayout = &docg3_oobinfo;
+	mtd_set_ecclayout(mtd, &docg3_oobinfo);
 	mtd->oobavail = 8;
 	mtd->ecc_strength = DOC_ECC_BCH_T;
 
-- 
2.5.0

[PATCH v5 15/50] mtd: docg3: use mtd_set_ecclayout() where appropriate

[Boris Brezillon]

Use the mtd_set_ecclayout() helper instead of directly assigning the
mtd->ecclayout field.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: Robert Jarzmik <robert.jarzmik@free.fr>
---
 drivers/mtd/devices/docg3.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/devices/docg3.c b/drivers/mtd/devices/docg3.c
index e7b2e43..6b516e1 100644
--- a/drivers/mtd/devices/docg3.c
+++ b/drivers/mtd/devices/docg3.c
@@ -1857,7 +1857,7 @@ static int __init doc_set_driver_info(int chip_id, struct mtd_info *mtd)
 	mtd->_read_oob = doc_read_oob;
 	mtd->_write_oob = doc_write_oob;
 	mtd->_block_isbad = doc_block_isbad;
-	mtd->ecclayout = &docg3_oobinfo;
+	mtd_set_ecclayout(mtd, &docg3_oobinfo);
 	mtd->oobavail = 8;
 	mtd->ecc_strength = DOC_ECC_BCH_T;
 
-- 
2.5.0

[PATCH v5 16/50] mtd: create an mtd_ooblayout_ops struct to ease ECC layout definition

[Boris Brezillon]

ECC layout definitions are currently exposed using the nand_ecclayout
struct which embeds oobfree and eccpos arrays with predefined size.
This approach was acceptable when NAND chips were providing relatively
small OOB regions, but MLC and TLC now provide OOB regions of several
hundreds of bytes, which implies a non negligible overhead for everybody
even those who only need to support legacy NANDs.

Create an mtd_ooblayout_ops interface providing the same functionality
(expose the ECC and oobfree layout) without the need for this huge
structure.

The mtd->ecclayout is now deprecated and should be replaced by the
equivalent mtd_ooblayout_ops. In the meantime we provide a wrapper around
the ->ecclayout field to ease migration to this new model.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/mtdchar.c   |   4 +-
 drivers/mtd/mtdconcat.c |   2 +-
 drivers/mtd/mtdcore.c   | 165 +++++++++++++++++++++++++++++++++++-------------
 drivers/mtd/mtdpart.c   |  23 ++++++-
 include/linux/mtd/mtd.h |  32 ++++++++--
 5 files changed, 174 insertions(+), 52 deletions(-)

diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index cd64ab7..3fad2c7 100644
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -888,7 +888,7 @@ static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
 	{
 		struct nand_oobinfo oi;
 
-		if (!mtd->ecclayout)
+		if (!mtd->ooblayout)
 			return -EOPNOTSUPP;
 
 		ret = get_oobinfo(mtd, &oi);
@@ -982,7 +982,7 @@ static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
 	{
 		struct nand_ecclayout_user *usrlay;
 
-		if (!mtd->ecclayout)
+		if (!mtd->ooblayout)
 			return -EOPNOTSUPP;
 
 		usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL);
diff --git a/drivers/mtd/mtdconcat.c b/drivers/mtd/mtdconcat.c
index 481565e..d573606 100644
--- a/drivers/mtd/mtdconcat.c
+++ b/drivers/mtd/mtdconcat.c
@@ -777,7 +777,7 @@ struct mtd_info *mtd_concat_create(struct mtd_info *subdev[],	/* subdevices to c
 
 	}
 
-	mtd_set_ecclayout(&concat->mtd, subdev[0]->ecclayout);
+	mtd_set_ooblayout(&concat->mtd, subdev[0]->ooblayout);
 
 	concat->num_subdev = num_devs;
 	concat->mtd.name = name;
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index 9fc278a..bebca51 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -1016,49 +1016,15 @@ EXPORT_SYMBOL_GPL(mtd_read_oob);
 int mtd_ooblayout_ecc(struct mtd_info *mtd, int section,
 		      struct mtd_oob_region *oobecc)
 {
-	int eccbyte = 0, cursection = 0, length = 0, eccpos = 0;
-
 	memset(oobecc, 0, sizeof(*oobecc));
 
 	if (!mtd || section < 0)
 		return -EINVAL;
 
-	if (!mtd->ecclayout)
+	if (!mtd->ooblayout || !mtd->ooblayout->ecc)
 		return -ENOTSUPP;
 
-	/*
-	 * This logic allows us to reuse the ->ecclayout information and
-	 * expose them as ECC regions (as done for the OOB free regions).
-	 *
-	 * TODO: this should be dropped as soon as we get rid of the
-	 * ->ecclayout field.
-	 */
-	for (eccbyte = 0; eccbyte < mtd->ecclayout->eccbytes; eccbyte++) {
-		eccpos = mtd->ecclayout->eccpos[eccbyte];
-
-		if (eccbyte < mtd->ecclayout->eccbytes - 1) {
-			int neccpos = mtd->ecclayout->eccpos[eccbyte + 1];
-
-			if (eccpos + 1 == neccpos) {
-				length++;
-				continue;
-			}
-		}
-
-		if (section == cursection)
-			break;
-
-		length = 0;
-		cursection++;
-	}
-
-	if (cursection != section || eccbyte >= mtd->ecclayout->eccbytes)
-		return -ERANGE;
-
-	oobecc->length = length + 1;
-	oobecc->offset = eccpos - length;
-
-	return 0;
+	return mtd->ooblayout->ecc(mtd, section, oobecc);
 }
 EXPORT_SYMBOL_GPL(mtd_ooblayout_ecc);
 
@@ -1087,16 +1053,10 @@ int mtd_ooblayout_free(struct mtd_info *mtd, int section,
 	if (!mtd || section < 0)
 		return -EINVAL;
 
-	if (!mtd->ecclayout)
+	if (!mtd->ooblayout || !mtd->ooblayout->free)
 		return -ENOTSUPP;
 
-	if (section >= MTD_MAX_OOBFREE_ENTRIES_LARGE)
-		return -ERANGE;
-
-	oobfree->offset = mtd->ecclayout->oobfree[section].offset;
-	oobfree->length = mtd->ecclayout->oobfree[section].length;
-
-	return 0;
+	return mtd->ooblayout->free(mtd, section, oobfree);
 }
 EXPORT_SYMBOL_GPL(mtd_ooblayout_free);
 
@@ -1397,6 +1357,123 @@ int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd)
 }
 EXPORT_SYMBOL_GPL(mtd_ooblayout_count_eccbytes);
 
+/**
+ * mtd_ecclayout_ecc - Default ooblayout_ecc iterator implementation
+ * @mtd: MTD device structure
+ * @section: ECC section. Depending on the layout you may have all the ECC
+ *	     bytes stored in a single contiguous section, or one section
+ *	     per ECC chunk (and sometime several sections for a single ECC
+ *	     ECC chunk)
+ * @oobecc: OOB region struct filled with the appropriate ECC position
+ *	    information
+ *
+ * This function is just a wrapper around the mtd->ecclayout field and is
+ * here to ease the transition to the mtd_ooblayout_ops approach.
+ * All it does is convert the layout->eccpos information into proper oob
+ * region definitions.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+static int mtd_ecclayout_ecc(struct mtd_info *mtd, int section,
+			     struct mtd_oob_region *oobecc)
+{
+	int eccbyte = 0, cursection = 0, length = 0, eccpos = 0;
+
+	if (!mtd->ecclayout)
+		return -ENOTSUPP;
+
+	/*
+	 * This logic allows us to reuse the ->ecclayout information and
+	 * expose them as ECC regions (as done for the OOB free regions).
+	 *
+	 * TODO: this should be dropped as soon as we get rid of the
+	 * ->ecclayout field.
+	 */
+	for (eccbyte = 0; eccbyte < mtd->ecclayout->eccbytes; eccbyte++) {
+		eccpos = mtd->ecclayout->eccpos[eccbyte];
+
+		if (eccbyte < mtd->ecclayout->eccbytes - 1) {
+			int neccpos = mtd->ecclayout->eccpos[eccbyte + 1];
+
+			if (eccpos + 1 == neccpos) {
+				length++;
+				continue;
+			}
+		}
+
+		if (section == cursection)
+			break;
+
+		length = 0;
+		cursection++;
+	}
+
+	if (cursection != section || eccbyte >= mtd->ecclayout->eccbytes)
+		return -ERANGE;
+
+	oobecc->length = length + 1;
+	oobecc->offset = eccpos - length;
+
+	return 0;
+}
+
+/**
+ * mtd_ecclayout_ecc - Default ooblayout_free iterator implementation
+ * @mtd: MTD device structure
+ * @section: Free section. Depending on the layout you may have all the free
+ *	     bytes stored in a single contiguous section, or one section
+ *	     per ECC chunk (and sometime several sections for a single ECC
+ *	     ECC chunk)
+ * @oobfree: OOB region struct filled with the appropriate free position
+ *	     information
+ *
+ * This function is just a wrapper around the mtd->ecclayout field and is
+ * here to ease the transition to the mtd_ooblayout_ops approach.
+ * All it does is convert the layout->oobfree information into proper oob
+ * region definitions.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+static int mtd_ecclayout_free(struct mtd_info *mtd, int section,
+			      struct mtd_oob_region *oobfree)
+{
+	struct nand_ecclayout *layout = mtd->ecclayout;
+
+	if (!layout)
+		return -ENOTSUPP;
+
+	if (section >= MTD_MAX_OOBFREE_ENTRIES_LARGE ||
+	    !layout->oobfree[section].length)
+		return -ERANGE;
+
+	oobfree->offset = layout->oobfree[section].offset;
+	oobfree->length = layout->oobfree[section].length;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops mtd_ecclayout_wrapper_ops = {
+	.ecc = mtd_ecclayout_ecc,
+	.free = mtd_ecclayout_free,
+};
+
+/**
+ * mtd_set_ecclayout - Attach an ecclayout to an MTD device
+ * @mtd: MTD device structure
+ * @ecclayout: The ecclayout to attach to the device
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+void mtd_set_ecclayout(struct mtd_info *mtd, struct nand_ecclayout *ecclayout)
+{
+	if (!mtd || !ecclayout)
+		return;
+
+	mtd->ecclayout = ecclayout;
+	mtd_set_ooblayout(mtd, &mtd_ecclayout_wrapper_ops);
+}
+EXPORT_SYMBOL_GPL(mtd_set_ecclayout);
+
 /*
  * Method to access the protection register area, present in some flash
  * devices. The user data is one time programmable but the factory data is read
diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
index f53d9d7..1f13e32 100644
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -317,6 +317,27 @@ static int part_block_markbad(struct mtd_info *mtd, loff_t ofs)
 	return res;
 }
 
+static int part_ooblayout_ecc(struct mtd_info *mtd, int section,
+			      struct mtd_oob_region *oobregion)
+{
+	struct mtd_part *part = mtd_to_part(mtd);
+
+	return mtd_ooblayout_ecc(part->master, section, oobregion);
+}
+
+static int part_ooblayout_free(struct mtd_info *mtd, int section,
+			       struct mtd_oob_region *oobregion)
+{
+	struct mtd_part *part = mtd_to_part(mtd);
+
+	return mtd_ooblayout_free(part->master, section, oobregion);
+}
+
+static const struct mtd_ooblayout_ops part_ooblayout_ops = {
+	.ecc = part_ooblayout_ecc,
+	.free = part_ooblayout_free,
+};
+
 static inline void free_partition(struct mtd_part *p)
 {
 	kfree(p->mtd.name);
@@ -533,7 +554,7 @@ static struct mtd_part *allocate_partition(struct mtd_info *master,
 			part->name);
 	}
 
-	mtd_set_ecclayout(&slave->mtd, master->ecclayout);
+	mtd_set_ooblayout(&slave->mtd, &part_ooblayout_ops);
 	slave->mtd.ecc_step_size = master->ecc_step_size;
 	slave->mtd.ecc_strength = master->ecc_strength;
 	slave->mtd.bitflip_threshold = master->bitflip_threshold;
diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index 6250dd8..a38fe9a 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -101,6 +101,9 @@ struct mtd_oob_ops {
  * similar, smaller struct nand_ecclayout_user (in mtd-abi.h) that is retained
  * for export to user-space via the ECCGETLAYOUT ioctl.
  * nand_ecclayout should be expandable in the future simply by the above macros.
+ *
+ * This structure is now deprecated, you should use struct nand_ecclayout_ops
+ * to describe your OOB layout.
  */
 struct nand_ecclayout {
 	__u32 eccbytes;
@@ -123,6 +126,22 @@ struct mtd_oob_region {
 	u32 length;
 };
 
+/*
+ * struct mtd_ooblayout_ops - NAND OOB layout operations
+ * @ecc: function returning an ECC region in the OOB area.
+ *	 Should return -ERANGE if %section exceeds the total number of
+ *	 ECC sections.
+ * @free: function returning a free region in the OOB area.
+ *	  Should return -ERANGE if %section exceeds the total number of
+ *	  free sections.
+ */
+struct mtd_ooblayout_ops {
+	int (*ecc)(struct mtd_info *mtd, int section,
+		   struct mtd_oob_region *oobecc);
+	int (*free)(struct mtd_info *mtd, int section,
+		    struct mtd_oob_region *oobfree);
+};
+
 struct module;	/* only needed for owner field in mtd_info */
 
 struct mtd_info {
@@ -181,9 +200,12 @@ struct mtd_info {
 	const char *name;
 	int index;
 
-	/* ECC layout structure pointer - read only! */
+	/* [Deprecated] ECC layout structure pointer - read only! */
 	struct nand_ecclayout *ecclayout;
 
+	/* OOB layout description */
+	const struct mtd_ooblayout_ops *ooblayout;
+
 	/* the ecc step size. */
 	unsigned int ecc_step_size;
 
@@ -286,10 +308,12 @@ int mtd_ooblayout_set_databytes(struct mtd_info *mtd, const u8 *databuf,
 int mtd_ooblayout_count_freebytes(struct mtd_info *mtd);
 int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd);
 
-static inline void mtd_set_ecclayout(struct mtd_info *mtd,
-				     struct nand_ecclayout *ecclayout)
+void mtd_set_ecclayout(struct mtd_info *mtd, struct nand_ecclayout *ecclayout);
+
+static inline void mtd_set_ooblayout(struct mtd_info *mtd,
+				     const struct mtd_ooblayout_ops *ooblayout)
 {
-	mtd->ecclayout = ecclayout;
+	mtd->ooblayout = ooblayout;
 }
 
 static inline void mtd_set_of_node(struct mtd_info *mtd,
-- 
2.5.0

[PATCH v5 16/50] mtd: create an mtd_ooblayout_ops struct to ease ECC layout definition

[Boris Brezillon]

ECC layout definitions are currently exposed using the nand_ecclayout
struct which embeds oobfree and eccpos arrays with predefined size.
This approach was acceptable when NAND chips were providing relatively
small OOB regions, but MLC and TLC now provide OOB regions of several
hundreds of bytes, which implies a non negligible overhead for everybody
even those who only need to support legacy NANDs.

Create an mtd_ooblayout_ops interface providing the same functionality
(expose the ECC and oobfree layout) without the need for this huge
structure.

The mtd->ecclayout is now deprecated and should be replaced by the
equivalent mtd_ooblayout_ops. In the meantime we provide a wrapper around
the ->ecclayout field to ease migration to this new model.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/mtdchar.c   |   4 +-
 drivers/mtd/mtdconcat.c |   2 +-
 drivers/mtd/mtdcore.c   | 165 +++++++++++++++++++++++++++++++++++-------------
 drivers/mtd/mtdpart.c   |  23 ++++++-
 include/linux/mtd/mtd.h |  32 ++++++++--
 5 files changed, 174 insertions(+), 52 deletions(-)

diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index cd64ab7..3fad2c7 100644
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -888,7 +888,7 @@ static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
 	{
 		struct nand_oobinfo oi;
 
-		if (!mtd->ecclayout)
+		if (!mtd->ooblayout)
 			return -EOPNOTSUPP;
 
 		ret = get_oobinfo(mtd, &oi);
@@ -982,7 +982,7 @@ static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
 	{
 		struct nand_ecclayout_user *usrlay;
 
-		if (!mtd->ecclayout)
+		if (!mtd->ooblayout)
 			return -EOPNOTSUPP;
 
 		usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL);
diff --git a/drivers/mtd/mtdconcat.c b/drivers/mtd/mtdconcat.c
index 481565e..d573606 100644
--- a/drivers/mtd/mtdconcat.c
+++ b/drivers/mtd/mtdconcat.c
@@ -777,7 +777,7 @@ struct mtd_info *mtd_concat_create(struct mtd_info *subdev[],	/* subdevices to c
 
 	}
 
-	mtd_set_ecclayout(&concat->mtd, subdev[0]->ecclayout);
+	mtd_set_ooblayout(&concat->mtd, subdev[0]->ooblayout);
 
 	concat->num_subdev = num_devs;
 	concat->mtd.name = name;
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index 9fc278a..bebca51 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -1016,49 +1016,15 @@ EXPORT_SYMBOL_GPL(mtd_read_oob);
 int mtd_ooblayout_ecc(struct mtd_info *mtd, int section,
 		      struct mtd_oob_region *oobecc)
 {
-	int eccbyte = 0, cursection = 0, length = 0, eccpos = 0;
-
 	memset(oobecc, 0, sizeof(*oobecc));
 
 	if (!mtd || section < 0)
 		return -EINVAL;
 
-	if (!mtd->ecclayout)
+	if (!mtd->ooblayout || !mtd->ooblayout->ecc)
 		return -ENOTSUPP;
 
-	/*
-	 * This logic allows us to reuse the ->ecclayout information and
-	 * expose them as ECC regions (as done for the OOB free regions).
-	 *
-	 * TODO: this should be dropped as soon as we get rid of the
-	 * ->ecclayout field.
-	 */
-	for (eccbyte = 0; eccbyte < mtd->ecclayout->eccbytes; eccbyte++) {
-		eccpos = mtd->ecclayout->eccpos[eccbyte];
-
-		if (eccbyte < mtd->ecclayout->eccbytes - 1) {
-			int neccpos = mtd->ecclayout->eccpos[eccbyte + 1];
-
-			if (eccpos + 1 == neccpos) {
-				length++;
-				continue;
-			}
-		}
-
-		if (section == cursection)
-			break;
-
-		length = 0;
-		cursection++;
-	}
-
-	if (cursection != section || eccbyte >= mtd->ecclayout->eccbytes)
-		return -ERANGE;
-
-	oobecc->length = length + 1;
-	oobecc->offset = eccpos - length;
-
-	return 0;
+	return mtd->ooblayout->ecc(mtd, section, oobecc);
 }
 EXPORT_SYMBOL_GPL(mtd_ooblayout_ecc);
 
@@ -1087,16 +1053,10 @@ int mtd_ooblayout_free(struct mtd_info *mtd, int section,
 	if (!mtd || section < 0)
 		return -EINVAL;
 
-	if (!mtd->ecclayout)
+	if (!mtd->ooblayout || !mtd->ooblayout->free)
 		return -ENOTSUPP;
 
-	if (section >= MTD_MAX_OOBFREE_ENTRIES_LARGE)
-		return -ERANGE;
-
-	oobfree->offset = mtd->ecclayout->oobfree[section].offset;
-	oobfree->length = mtd->ecclayout->oobfree[section].length;
-
-	return 0;
+	return mtd->ooblayout->free(mtd, section, oobfree);
 }
 EXPORT_SYMBOL_GPL(mtd_ooblayout_free);
 
@@ -1397,6 +1357,123 @@ int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd)
 }
 EXPORT_SYMBOL_GPL(mtd_ooblayout_count_eccbytes);
 
+/**
+ * mtd_ecclayout_ecc - Default ooblayout_ecc iterator implementation
+ * @mtd: MTD device structure
+ * @section: ECC section. Depending on the layout you may have all the ECC
+ *	     bytes stored in a single contiguous section, or one section
+ *	     per ECC chunk (and sometime several sections for a single ECC
+ *	     ECC chunk)
+ * @oobecc: OOB region struct filled with the appropriate ECC position
+ *	    information
+ *
+ * This function is just a wrapper around the mtd->ecclayout field and is
+ * here to ease the transition to the mtd_ooblayout_ops approach.
+ * All it does is convert the layout->eccpos information into proper oob
+ * region definitions.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+static int mtd_ecclayout_ecc(struct mtd_info *mtd, int section,
+			     struct mtd_oob_region *oobecc)
+{
+	int eccbyte = 0, cursection = 0, length = 0, eccpos = 0;
+
+	if (!mtd->ecclayout)
+		return -ENOTSUPP;
+
+	/*
+	 * This logic allows us to reuse the ->ecclayout information and
+	 * expose them as ECC regions (as done for the OOB free regions).
+	 *
+	 * TODO: this should be dropped as soon as we get rid of the
+	 * ->ecclayout field.
+	 */
+	for (eccbyte = 0; eccbyte < mtd->ecclayout->eccbytes; eccbyte++) {
+		eccpos = mtd->ecclayout->eccpos[eccbyte];
+
+		if (eccbyte < mtd->ecclayout->eccbytes - 1) {
+			int neccpos = mtd->ecclayout->eccpos[eccbyte + 1];
+
+			if (eccpos + 1 == neccpos) {
+				length++;
+				continue;
+			}
+		}
+
+		if (section == cursection)
+			break;
+
+		length = 0;
+		cursection++;
+	}
+
+	if (cursection != section || eccbyte >= mtd->ecclayout->eccbytes)
+		return -ERANGE;
+
+	oobecc->length = length + 1;
+	oobecc->offset = eccpos - length;
+
+	return 0;
+}
+
+/**
+ * mtd_ecclayout_ecc - Default ooblayout_free iterator implementation
+ * @mtd: MTD device structure
+ * @section: Free section. Depending on the layout you may have all the free
+ *	     bytes stored in a single contiguous section, or one section
+ *	     per ECC chunk (and sometime several sections for a single ECC
+ *	     ECC chunk)
+ * @oobfree: OOB region struct filled with the appropriate free position
+ *	     information
+ *
+ * This function is just a wrapper around the mtd->ecclayout field and is
+ * here to ease the transition to the mtd_ooblayout_ops approach.
+ * All it does is convert the layout->oobfree information into proper oob
+ * region definitions.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+static int mtd_ecclayout_free(struct mtd_info *mtd, int section,
+			      struct mtd_oob_region *oobfree)
+{
+	struct nand_ecclayout *layout = mtd->ecclayout;
+
+	if (!layout)
+		return -ENOTSUPP;
+
+	if (section >= MTD_MAX_OOBFREE_ENTRIES_LARGE ||
+	    !layout->oobfree[section].length)
+		return -ERANGE;
+
+	oobfree->offset = layout->oobfree[section].offset;
+	oobfree->length = layout->oobfree[section].length;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops mtd_ecclayout_wrapper_ops = {
+	.ecc = mtd_ecclayout_ecc,
+	.free = mtd_ecclayout_free,
+};
+
+/**
+ * mtd_set_ecclayout - Attach an ecclayout to an MTD device
+ * @mtd: MTD device structure
+ * @ecclayout: The ecclayout to attach to the device
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+void mtd_set_ecclayout(struct mtd_info *mtd, struct nand_ecclayout *ecclayout)
+{
+	if (!mtd || !ecclayout)
+		return;
+
+	mtd->ecclayout = ecclayout;
+	mtd_set_ooblayout(mtd, &mtd_ecclayout_wrapper_ops);
+}
+EXPORT_SYMBOL_GPL(mtd_set_ecclayout);
+
 /*
  * Method to access the protection register area, present in some flash
  * devices. The user data is one time programmable but the factory data is read
diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
index f53d9d7..1f13e32 100644
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -317,6 +317,27 @@ static int part_block_markbad(struct mtd_info *mtd, loff_t ofs)
 	return res;
 }
 
+static int part_ooblayout_ecc(struct mtd_info *mtd, int section,
+			      struct mtd_oob_region *oobregion)
+{
+	struct mtd_part *part = mtd_to_part(mtd);
+
+	return mtd_ooblayout_ecc(part->master, section, oobregion);
+}
+
+static int part_ooblayout_free(struct mtd_info *mtd, int section,
+			       struct mtd_oob_region *oobregion)
+{
+	struct mtd_part *part = mtd_to_part(mtd);
+
+	return mtd_ooblayout_free(part->master, section, oobregion);
+}
+
+static const struct mtd_ooblayout_ops part_ooblayout_ops = {
+	.ecc = part_ooblayout_ecc,
+	.free = part_ooblayout_free,
+};
+
 static inline void free_partition(struct mtd_part *p)
 {
 	kfree(p->mtd.name);
@@ -533,7 +554,7 @@ static struct mtd_part *allocate_partition(struct mtd_info *master,
 			part->name);
 	}
 
-	mtd_set_ecclayout(&slave->mtd, master->ecclayout);
+	mtd_set_ooblayout(&slave->mtd, &part_ooblayout_ops);
 	slave->mtd.ecc_step_size = master->ecc_step_size;
 	slave->mtd.ecc_strength = master->ecc_strength;
 	slave->mtd.bitflip_threshold = master->bitflip_threshold;
diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index 6250dd8..a38fe9a 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -101,6 +101,9 @@ struct mtd_oob_ops {
  * similar, smaller struct nand_ecclayout_user (in mtd-abi.h) that is retained
  * for export to user-space via the ECCGETLAYOUT ioctl.
  * nand_ecclayout should be expandable in the future simply by the above macros.
+ *
+ * This structure is now deprecated, you should use struct nand_ecclayout_ops
+ * to describe your OOB layout.
  */
 struct nand_ecclayout {
 	__u32 eccbytes;
@@ -123,6 +126,22 @@ struct mtd_oob_region {
 	u32 length;
 };
 
+/*
+ * struct mtd_ooblayout_ops - NAND OOB layout operations
+ * @ecc: function returning an ECC region in the OOB area.
+ *	 Should return -ERANGE if %section exceeds the total number of
+ *	 ECC sections.
+ * @free: function returning a free region in the OOB area.
+ *	  Should return -ERANGE if %section exceeds the total number of
+ *	  free sections.
+ */
+struct mtd_ooblayout_ops {
+	int (*ecc)(struct mtd_info *mtd, int section,
+		   struct mtd_oob_region *oobecc);
+	int (*free)(struct mtd_info *mtd, int section,
+		    struct mtd_oob_region *oobfree);
+};
+
 struct module;	/* only needed for owner field in mtd_info */
 
 struct mtd_info {
@@ -181,9 +200,12 @@ struct mtd_info {
 	const char *name;
 	int index;
 
-	/* ECC layout structure pointer - read only! */
+	/* [Deprecated] ECC layout structure pointer - read only! */
 	struct nand_ecclayout *ecclayout;
 
+	/* OOB layout description */
+	const struct mtd_ooblayout_ops *ooblayout;
+
 	/* the ecc step size. */
 	unsigned int ecc_step_size;
 
@@ -286,10 +308,12 @@ int mtd_ooblayout_set_databytes(struct mtd_info *mtd, const u8 *databuf,
 int mtd_ooblayout_count_freebytes(struct mtd_info *mtd);
 int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd);
 
-static inline void mtd_set_ecclayout(struct mtd_info *mtd,
-				     struct nand_ecclayout *ecclayout)
+void mtd_set_ecclayout(struct mtd_info *mtd, struct nand_ecclayout *ecclayout);
+
+static inline void mtd_set_ooblayout(struct mtd_info *mtd,
+				     const struct mtd_ooblayout_ops *ooblayout)
 {
-	mtd->ecclayout = ecclayout;
+	mtd->ooblayout = ooblayout;
 }
 
 static inline void mtd_set_of_node(struct mtd_info *mtd,
-- 
2.5.0

[PATCH v5 16/50] mtd: create an mtd_ooblayout_ops struct to ease ECC layout definition

[Boris Brezillon]

ECC layout definitions are currently exposed using the nand_ecclayout
struct which embeds oobfree and eccpos arrays with predefined size.
This approach was acceptable when NAND chips were providing relatively
small OOB regions, but MLC and TLC now provide OOB regions of several
hundreds of bytes, which implies a non negligible overhead for everybody
even those who only need to support legacy NANDs.

Create an mtd_ooblayout_ops interface providing the same functionality
(expose the ECC and oobfree layout) without the need for this huge
structure.

The mtd->ecclayout is now deprecated and should be replaced by the
equivalent mtd_ooblayout_ops. In the meantime we provide a wrapper around
the ->ecclayout field to ease migration to this new model.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/mtdchar.c   |   4 +-
 drivers/mtd/mtdconcat.c |   2 +-
 drivers/mtd/mtdcore.c   | 165 +++++++++++++++++++++++++++++++++++-------------
 drivers/mtd/mtdpart.c   |  23 ++++++-
 include/linux/mtd/mtd.h |  32 ++++++++--
 5 files changed, 174 insertions(+), 52 deletions(-)

diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index cd64ab7..3fad2c7 100644
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -888,7 +888,7 @@ static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
 	{
 		struct nand_oobinfo oi;
 
-		if (!mtd->ecclayout)
+		if (!mtd->ooblayout)
 			return -EOPNOTSUPP;
 
 		ret = get_oobinfo(mtd, &oi);
@@ -982,7 +982,7 @@ static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
 	{
 		struct nand_ecclayout_user *usrlay;
 
-		if (!mtd->ecclayout)
+		if (!mtd->ooblayout)
 			return -EOPNOTSUPP;
 
 		usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL);
diff --git a/drivers/mtd/mtdconcat.c b/drivers/mtd/mtdconcat.c
index 481565e..d573606 100644
--- a/drivers/mtd/mtdconcat.c
+++ b/drivers/mtd/mtdconcat.c
@@ -777,7 +777,7 @@ struct mtd_info *mtd_concat_create(struct mtd_info *subdev[],	/* subdevices to c
 
 	}
 
-	mtd_set_ecclayout(&concat->mtd, subdev[0]->ecclayout);
+	mtd_set_ooblayout(&concat->mtd, subdev[0]->ooblayout);
 
 	concat->num_subdev = num_devs;
 	concat->mtd.name = name;
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index 9fc278a..bebca51 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -1016,49 +1016,15 @@ EXPORT_SYMBOL_GPL(mtd_read_oob);
 int mtd_ooblayout_ecc(struct mtd_info *mtd, int section,
 		      struct mtd_oob_region *oobecc)
 {
-	int eccbyte = 0, cursection = 0, length = 0, eccpos = 0;
-
 	memset(oobecc, 0, sizeof(*oobecc));
 
 	if (!mtd || section < 0)
 		return -EINVAL;
 
-	if (!mtd->ecclayout)
+	if (!mtd->ooblayout || !mtd->ooblayout->ecc)
 		return -ENOTSUPP;
 
-	/*
-	 * This logic allows us to reuse the ->ecclayout information and
-	 * expose them as ECC regions (as done for the OOB free regions).
-	 *
-	 * TODO: this should be dropped as soon as we get rid of the
-	 * ->ecclayout field.
-	 */
-	for (eccbyte = 0; eccbyte < mtd->ecclayout->eccbytes; eccbyte++) {
-		eccpos = mtd->ecclayout->eccpos[eccbyte];
-
-		if (eccbyte < mtd->ecclayout->eccbytes - 1) {
-			int neccpos = mtd->ecclayout->eccpos[eccbyte + 1];
-
-			if (eccpos + 1 == neccpos) {
-				length++;
-				continue;
-			}
-		}
-
-		if (section == cursection)
-			break;
-
-		length = 0;
-		cursection++;
-	}
-
-	if (cursection != section || eccbyte >= mtd->ecclayout->eccbytes)
-		return -ERANGE;
-
-	oobecc->length = length + 1;
-	oobecc->offset = eccpos - length;
-
-	return 0;
+	return mtd->ooblayout->ecc(mtd, section, oobecc);
 }
 EXPORT_SYMBOL_GPL(mtd_ooblayout_ecc);
 
@@ -1087,16 +1053,10 @@ int mtd_ooblayout_free(struct mtd_info *mtd, int section,
 	if (!mtd || section < 0)
 		return -EINVAL;
 
-	if (!mtd->ecclayout)
+	if (!mtd->ooblayout || !mtd->ooblayout->free)
 		return -ENOTSUPP;
 
-	if (section >= MTD_MAX_OOBFREE_ENTRIES_LARGE)
-		return -ERANGE;
-
-	oobfree->offset = mtd->ecclayout->oobfree[section].offset;
-	oobfree->length = mtd->ecclayout->oobfree[section].length;
-
-	return 0;
+	return mtd->ooblayout->free(mtd, section, oobfree);
 }
 EXPORT_SYMBOL_GPL(mtd_ooblayout_free);
 
@@ -1397,6 +1357,123 @@ int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd)
 }
 EXPORT_SYMBOL_GPL(mtd_ooblayout_count_eccbytes);
 
+/**
+ * mtd_ecclayout_ecc - Default ooblayout_ecc iterator implementation
+ * @mtd: MTD device structure
+ * @section: ECC section. Depending on the layout you may have all the ECC
+ *	     bytes stored in a single contiguous section, or one section
+ *	     per ECC chunk (and sometime several sections for a single ECC
+ *	     ECC chunk)
+ * @oobecc: OOB region struct filled with the appropriate ECC position
+ *	    information
+ *
+ * This function is just a wrapper around the mtd->ecclayout field and is
+ * here to ease the transition to the mtd_ooblayout_ops approach.
+ * All it does is convert the layout->eccpos information into proper oob
+ * region definitions.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+static int mtd_ecclayout_ecc(struct mtd_info *mtd, int section,
+			     struct mtd_oob_region *oobecc)
+{
+	int eccbyte = 0, cursection = 0, length = 0, eccpos = 0;
+
+	if (!mtd->ecclayout)
+		return -ENOTSUPP;
+
+	/*
+	 * This logic allows us to reuse the ->ecclayout information and
+	 * expose them as ECC regions (as done for the OOB free regions).
+	 *
+	 * TODO: this should be dropped as soon as we get rid of the
+	 * ->ecclayout field.
+	 */
+	for (eccbyte = 0; eccbyte < mtd->ecclayout->eccbytes; eccbyte++) {
+		eccpos = mtd->ecclayout->eccpos[eccbyte];
+
+		if (eccbyte < mtd->ecclayout->eccbytes - 1) {
+			int neccpos = mtd->ecclayout->eccpos[eccbyte + 1];
+
+			if (eccpos + 1 == neccpos) {
+				length++;
+				continue;
+			}
+		}
+
+		if (section == cursection)
+			break;
+
+		length = 0;
+		cursection++;
+	}
+
+	if (cursection != section || eccbyte >= mtd->ecclayout->eccbytes)
+		return -ERANGE;
+
+	oobecc->length = length + 1;
+	oobecc->offset = eccpos - length;
+
+	return 0;
+}
+
+/**
+ * mtd_ecclayout_ecc - Default ooblayout_free iterator implementation
+ * @mtd: MTD device structure
+ * @section: Free section. Depending on the layout you may have all the free
+ *	     bytes stored in a single contiguous section, or one section
+ *	     per ECC chunk (and sometime several sections for a single ECC
+ *	     ECC chunk)
+ * @oobfree: OOB region struct filled with the appropriate free position
+ *	     information
+ *
+ * This function is just a wrapper around the mtd->ecclayout field and is
+ * here to ease the transition to the mtd_ooblayout_ops approach.
+ * All it does is convert the layout->oobfree information into proper oob
+ * region definitions.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+static int mtd_ecclayout_free(struct mtd_info *mtd, int section,
+			      struct mtd_oob_region *oobfree)
+{
+	struct nand_ecclayout *layout = mtd->ecclayout;
+
+	if (!layout)
+		return -ENOTSUPP;
+
+	if (section >= MTD_MAX_OOBFREE_ENTRIES_LARGE ||
+	    !layout->oobfree[section].length)
+		return -ERANGE;
+
+	oobfree->offset = layout->oobfree[section].offset;
+	oobfree->length = layout->oobfree[section].length;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops mtd_ecclayout_wrapper_ops = {
+	.ecc = mtd_ecclayout_ecc,
+	.free = mtd_ecclayout_free,
+};
+
+/**
+ * mtd_set_ecclayout - Attach an ecclayout to an MTD device
+ * @mtd: MTD device structure
+ * @ecclayout: The ecclayout to attach to the device
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+void mtd_set_ecclayout(struct mtd_info *mtd, struct nand_ecclayout *ecclayout)
+{
+	if (!mtd || !ecclayout)
+		return;
+
+	mtd->ecclayout = ecclayout;
+	mtd_set_ooblayout(mtd, &mtd_ecclayout_wrapper_ops);
+}
+EXPORT_SYMBOL_GPL(mtd_set_ecclayout);
+
 /*
  * Method to access the protection register area, present in some flash
  * devices. The user data is one time programmable but the factory data is read
diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
index f53d9d7..1f13e32 100644
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -317,6 +317,27 @@ static int part_block_markbad(struct mtd_info *mtd, loff_t ofs)
 	return res;
 }
 
+static int part_ooblayout_ecc(struct mtd_info *mtd, int section,
+			      struct mtd_oob_region *oobregion)
+{
+	struct mtd_part *part = mtd_to_part(mtd);
+
+	return mtd_ooblayout_ecc(part->master, section, oobregion);
+}
+
+static int part_ooblayout_free(struct mtd_info *mtd, int section,
+			       struct mtd_oob_region *oobregion)
+{
+	struct mtd_part *part = mtd_to_part(mtd);
+
+	return mtd_ooblayout_free(part->master, section, oobregion);
+}
+
+static const struct mtd_ooblayout_ops part_ooblayout_ops = {
+	.ecc = part_ooblayout_ecc,
+	.free = part_ooblayout_free,
+};
+
 static inline void free_partition(struct mtd_part *p)
 {
 	kfree(p->mtd.name);
@@ -533,7 +554,7 @@ static struct mtd_part *allocate_partition(struct mtd_info *master,
 			part->name);
 	}
 
-	mtd_set_ecclayout(&slave->mtd, master->ecclayout);
+	mtd_set_ooblayout(&slave->mtd, &part_ooblayout_ops);
 	slave->mtd.ecc_step_size = master->ecc_step_size;
 	slave->mtd.ecc_strength = master->ecc_strength;
 	slave->mtd.bitflip_threshold = master->bitflip_threshold;
diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index 6250dd8..a38fe9a 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -101,6 +101,9 @@ struct mtd_oob_ops {
  * similar, smaller struct nand_ecclayout_user (in mtd-abi.h) that is retained
  * for export to user-space via the ECCGETLAYOUT ioctl.
  * nand_ecclayout should be expandable in the future simply by the above macros.
+ *
+ * This structure is now deprecated, you should use struct nand_ecclayout_ops
+ * to describe your OOB layout.
  */
 struct nand_ecclayout {
 	__u32 eccbytes;
@@ -123,6 +126,22 @@ struct mtd_oob_region {
 	u32 length;
 };
 
+/*
+ * struct mtd_ooblayout_ops - NAND OOB layout operations
+ * @ecc: function returning an ECC region in the OOB area.
+ *	 Should return -ERANGE if %section exceeds the total number of
+ *	 ECC sections.
+ * @free: function returning a free region in the OOB area.
+ *	  Should return -ERANGE if %section exceeds the total number of
+ *	  free sections.
+ */
+struct mtd_ooblayout_ops {
+	int (*ecc)(struct mtd_info *mtd, int section,
+		   struct mtd_oob_region *oobecc);
+	int (*free)(struct mtd_info *mtd, int section,
+		    struct mtd_oob_region *oobfree);
+};
+
 struct module;	/* only needed for owner field in mtd_info */
 
 struct mtd_info {
@@ -181,9 +200,12 @@ struct mtd_info {
 	const char *name;
 	int index;
 
-	/* ECC layout structure pointer - read only! */
+	/* [Deprecated] ECC layout structure pointer - read only! */
 	struct nand_ecclayout *ecclayout;
 
+	/* OOB layout description */
+	const struct mtd_ooblayout_ops *ooblayout;
+
 	/* the ecc step size. */
 	unsigned int ecc_step_size;
 
@@ -286,10 +308,12 @@ int mtd_ooblayout_set_databytes(struct mtd_info *mtd, const u8 *databuf,
 int mtd_ooblayout_count_freebytes(struct mtd_info *mtd);
 int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd);
 
-static inline void mtd_set_ecclayout(struct mtd_info *mtd,
-				     struct nand_ecclayout *ecclayout)
+void mtd_set_ecclayout(struct mtd_info *mtd, struct nand_ecclayout *ecclayout);
+
+static inline void mtd_set_ooblayout(struct mtd_info *mtd,
+				     const struct mtd_ooblayout_ops *ooblayout)
 {
-	mtd->ecclayout = ecclayout;
+	mtd->ooblayout = ooblayout;
 }
 
 static inline void mtd_set_of_node(struct mtd_info *mtd,
-- 
2.5.0

[PATCH v5 17/50] mtd: docg3: switch to mtd_ooblayout_ops

[Boris Brezillon]

Replace the nand_ecclayout definition by the equivalent mtd_ooblayout_ops
definition.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: Robert Jarzmik <robert.jarzmik@free.fr>
---
 drivers/mtd/devices/docg3.c | 46 ++++++++++++++++++++++++++++++++++-----------
 1 file changed, 35 insertions(+), 11 deletions(-)

diff --git a/drivers/mtd/devices/docg3.c b/drivers/mtd/devices/docg3.c
index 6b516e1..b833e6c 100644
--- a/drivers/mtd/devices/docg3.c
+++ b/drivers/mtd/devices/docg3.c
@@ -67,16 +67,40 @@ module_param(reliable_mode, uint, 0);
 MODULE_PARM_DESC(reliable_mode, "Set the docg3 mode (0=normal MLC, 1=fast, "
 		 "2=reliable) : MLC normal operations are in normal mode");
 
-/**
- * struct docg3_oobinfo - DiskOnChip G3 OOB layout
- * @eccbytes: 8 bytes are used (1 for Hamming ECC, 7 for BCH ECC)
- * @eccpos: ecc positions (byte 7 is Hamming ECC, byte 8-14 are BCH ECC)
- * @oobfree: free pageinfo bytes (byte 0 until byte 6, byte 15
- */
-static struct nand_ecclayout docg3_oobinfo = {
-	.eccbytes = 8,
-	.eccpos = {7, 8, 9, 10, 11, 12, 13, 14},
-	.oobfree = {{0, 7}, {15, 1} },
+static int docg3_ooblayout_ecc(struct mtd_info *mtd, int section,
+			       struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	/* byte 7 is Hamming ECC, byte 8-14 are BCH ECC */
+	oobregion->offset = 7;
+	oobregion->length = 8;
+
+	return 0;
+}
+
+static int docg3_ooblayout_free(struct mtd_info *mtd, int section,
+				struct mtd_oob_region *oobregion)
+{
+	if (section > 1)
+		return -ERANGE;
+
+	/* free bytes: byte 0 until byte 6, byte 15 */
+	if (!section) {
+		oobregion->offset = 0;
+		oobregion->length = 7;
+	} else {
+		oobregion->offset = 15;
+		oobregion->length = 1;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops nand_ooblayout_docg3_ops = {
+	.ecc = docg3_ooblayout_ecc,
+	.free = docg3_ooblayout_free,
 };
 
 static inline u8 doc_readb(struct docg3 *docg3, u16 reg)
@@ -1857,7 +1881,7 @@ static int __init doc_set_driver_info(int chip_id, struct mtd_info *mtd)
 	mtd->_read_oob = doc_read_oob;
 	mtd->_write_oob = doc_write_oob;
 	mtd->_block_isbad = doc_block_isbad;
-	mtd_set_ecclayout(mtd, &docg3_oobinfo);
+	mtd_set_ooblayout(mtd, &nand_ooblayout_docg3_ops);
 	mtd->oobavail = 8;
 	mtd->ecc_strength = DOC_ECC_BCH_T;
 
-- 
2.5.0

[PATCH v5 17/50] mtd: docg3: switch to mtd_ooblayout_ops

[Boris Brezillon]

Replace the nand_ecclayout definition by the equivalent mtd_ooblayout_ops
definition.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
Acked-by: Robert Jarzmik <robert.jarzmik-GANU6spQydw@public.gmane.org>
---
 drivers/mtd/devices/docg3.c | 46 ++++++++++++++++++++++++++++++++++-----------
 1 file changed, 35 insertions(+), 11 deletions(-)

diff --git a/drivers/mtd/devices/docg3.c b/drivers/mtd/devices/docg3.c
index 6b516e1..b833e6c 100644
--- a/drivers/mtd/devices/docg3.c
+++ b/drivers/mtd/devices/docg3.c
@@ -67,16 +67,40 @@ module_param(reliable_mode, uint, 0);
 MODULE_PARM_DESC(reliable_mode, "Set the docg3 mode (0=normal MLC, 1=fast, "
 		 "2=reliable) : MLC normal operations are in normal mode");
 
-/**
- * struct docg3_oobinfo - DiskOnChip G3 OOB layout
- * @eccbytes: 8 bytes are used (1 for Hamming ECC, 7 for BCH ECC)
- * @eccpos: ecc positions (byte 7 is Hamming ECC, byte 8-14 are BCH ECC)
- * @oobfree: free pageinfo bytes (byte 0 until byte 6, byte 15
- */
-static struct nand_ecclayout docg3_oobinfo = {
-	.eccbytes = 8,
-	.eccpos = {7, 8, 9, 10, 11, 12, 13, 14},
-	.oobfree = {{0, 7}, {15, 1} },
+static int docg3_ooblayout_ecc(struct mtd_info *mtd, int section,
+			       struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	/* byte 7 is Hamming ECC, byte 8-14 are BCH ECC */
+	oobregion->offset = 7;
+	oobregion->length = 8;
+
+	return 0;
+}
+
+static int docg3_ooblayout_free(struct mtd_info *mtd, int section,
+				struct mtd_oob_region *oobregion)
+{
+	if (section > 1)
+		return -ERANGE;
+
+	/* free bytes: byte 0 until byte 6, byte 15 */
+	if (!section) {
+		oobregion->offset = 0;
+		oobregion->length = 7;
+	} else {
+		oobregion->offset = 15;
+		oobregion->length = 1;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops nand_ooblayout_docg3_ops = {
+	.ecc = docg3_ooblayout_ecc,
+	.free = docg3_ooblayout_free,
 };
 
 static inline u8 doc_readb(struct docg3 *docg3, u16 reg)
@@ -1857,7 +1881,7 @@ static int __init doc_set_driver_info(int chip_id, struct mtd_info *mtd)
 	mtd->_read_oob = doc_read_oob;
 	mtd->_write_oob = doc_write_oob;
 	mtd->_block_isbad = doc_block_isbad;
-	mtd_set_ecclayout(mtd, &docg3_oobinfo);
+	mtd_set_ooblayout(mtd, &nand_ooblayout_docg3_ops);
 	mtd->oobavail = 8;
 	mtd->ecc_strength = DOC_ECC_BCH_T;
 
-- 
2.5.0

[PATCH v5 17/50] mtd: docg3: switch to mtd_ooblayout_ops

[Boris Brezillon]

Replace the nand_ecclayout definition by the equivalent mtd_ooblayout_ops
definition.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: Robert Jarzmik <robert.jarzmik@free.fr>
---
 drivers/mtd/devices/docg3.c | 46 ++++++++++++++++++++++++++++++++++-----------
 1 file changed, 35 insertions(+), 11 deletions(-)

diff --git a/drivers/mtd/devices/docg3.c b/drivers/mtd/devices/docg3.c
index 6b516e1..b833e6c 100644
--- a/drivers/mtd/devices/docg3.c
+++ b/drivers/mtd/devices/docg3.c
@@ -67,16 +67,40 @@ module_param(reliable_mode, uint, 0);
 MODULE_PARM_DESC(reliable_mode, "Set the docg3 mode (0=normal MLC, 1=fast, "
 		 "2=reliable) : MLC normal operations are in normal mode");
 
-/**
- * struct docg3_oobinfo - DiskOnChip G3 OOB layout
- * @eccbytes: 8 bytes are used (1 for Hamming ECC, 7 for BCH ECC)
- * @eccpos: ecc positions (byte 7 is Hamming ECC, byte 8-14 are BCH ECC)
- * @oobfree: free pageinfo bytes (byte 0 until byte 6, byte 15
- */
-static struct nand_ecclayout docg3_oobinfo = {
-	.eccbytes = 8,
-	.eccpos = {7, 8, 9, 10, 11, 12, 13, 14},
-	.oobfree = {{0, 7}, {15, 1} },
+static int docg3_ooblayout_ecc(struct mtd_info *mtd, int section,
+			       struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	/* byte 7 is Hamming ECC, byte 8-14 are BCH ECC */
+	oobregion->offset = 7;
+	oobregion->length = 8;
+
+	return 0;
+}
+
+static int docg3_ooblayout_free(struct mtd_info *mtd, int section,
+				struct mtd_oob_region *oobregion)
+{
+	if (section > 1)
+		return -ERANGE;
+
+	/* free bytes: byte 0 until byte 6, byte 15 */
+	if (!section) {
+		oobregion->offset = 0;
+		oobregion->length = 7;
+	} else {
+		oobregion->offset = 15;
+		oobregion->length = 1;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops nand_ooblayout_docg3_ops = {
+	.ecc = docg3_ooblayout_ecc,
+	.free = docg3_ooblayout_free,
 };
 
 static inline u8 doc_readb(struct docg3 *docg3, u16 reg)
@@ -1857,7 +1881,7 @@ static int __init doc_set_driver_info(int chip_id, struct mtd_info *mtd)
 	mtd->_read_oob = doc_read_oob;
 	mtd->_write_oob = doc_write_oob;
 	mtd->_block_isbad = doc_block_isbad;
-	mtd_set_ecclayout(mtd, &docg3_oobinfo);
+	mtd_set_ooblayout(mtd, &nand_ooblayout_docg3_ops);
 	mtd->oobavail = 8;
 	mtd->ecc_strength = DOC_ECC_BCH_T;
 
-- 
2.5.0

[PATCH v5 18/50] mtd: nand: implement the default mtd_ooblayout_ops

[Boris Brezillon]

Replace the default nand_ecclayout definitions for large and small page
devices with the equivalent mtd_ooblayout_ops.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/nand_base.c | 148 ++++++++++++++++++++++++++++---------------
 include/linux/mtd/nand.h     |   3 +
 2 files changed, 99 insertions(+), 52 deletions(-)

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 295af79..3d6985e 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -48,50 +48,6 @@
 #include <linux/mtd/partitions.h>
 #include <linux/of_mtd.h>
 
-/* Define default oob placement schemes for large and small page devices */
-static struct nand_ecclayout nand_oob_8 = {
-	.eccbytes = 3,
-	.eccpos = {0, 1, 2},
-	.oobfree = {
-		{.offset = 3,
-		 .length = 2},
-		{.offset = 6,
-		 .length = 2} }
-};
-
-static struct nand_ecclayout nand_oob_16 = {
-	.eccbytes = 6,
-	.eccpos = {0, 1, 2, 3, 6, 7},
-	.oobfree = {
-		{.offset = 8,
-		 . length = 8} }
-};
-
-static struct nand_ecclayout nand_oob_64 = {
-	.eccbytes = 24,
-	.eccpos = {
-		   40, 41, 42, 43, 44, 45, 46, 47,
-		   48, 49, 50, 51, 52, 53, 54, 55,
-		   56, 57, 58, 59, 60, 61, 62, 63},
-	.oobfree = {
-		{.offset = 2,
-		 .length = 38} }
-};
-
-static struct nand_ecclayout nand_oob_128 = {
-	.eccbytes = 48,
-	.eccpos = {
-		   80, 81, 82, 83, 84, 85, 86, 87,
-		   88, 89, 90, 91, 92, 93, 94, 95,
-		   96, 97, 98, 99, 100, 101, 102, 103,
-		   104, 105, 106, 107, 108, 109, 110, 111,
-		   112, 113, 114, 115, 116, 117, 118, 119,
-		   120, 121, 122, 123, 124, 125, 126, 127},
-	.oobfree = {
-		{.offset = 2,
-		 .length = 78} }
-};
-
 static int nand_get_device(struct mtd_info *mtd, int new_state);
 
 static int nand_do_write_oob(struct mtd_info *mtd, loff_t to,
@@ -103,6 +59,92 @@ static int nand_do_write_oob(struct mtd_info *mtd, loff_t to,
  */
 DEFINE_LED_TRIGGER(nand_led_trigger);
 
+/* Define default oob placement schemes for large and small page devices */
+static int nand_ooblayout_ecc_sp(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct nand_ecc_ctrl *ecc = &chip->ecc;
+
+	if (section > 1)
+		return -ERANGE;
+
+	if (!section) {
+		oobregion->offset = 0;
+		oobregion->length = 4;
+	} else {
+		oobregion->offset = 6;
+		oobregion->length = ecc->total - 4;
+	}
+
+	return 0;
+}
+
+static int nand_ooblayout_free_sp(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	if (section > 1)
+		return -ERANGE;
+
+	if (mtd->oobsize == 16) {
+		if (section)
+			return -ERANGE;
+
+		oobregion->length = 8;
+		oobregion->offset = 8;
+	} else {
+		oobregion->length = 2;
+		if (!section)
+			oobregion->offset = 3;
+		else
+			oobregion->offset = 6;
+	}
+
+	return 0;
+}
+
+const struct mtd_ooblayout_ops nand_ooblayout_sp_ops = {
+	.ecc = nand_ooblayout_ecc_sp,
+	.free = nand_ooblayout_free_sp,
+};
+EXPORT_SYMBOL_GPL(nand_ooblayout_sp_ops);
+
+static int nand_ooblayout_ecc_lp(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct nand_ecc_ctrl *ecc = &chip->ecc;
+
+	if (section)
+		return -ERANGE;
+
+	oobregion->length = ecc->total;
+	oobregion->offset = mtd->oobsize - oobregion->length;
+
+	return 0;
+}
+
+static int nand_ooblayout_free_lp(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct nand_ecc_ctrl *ecc = &chip->ecc;
+
+	if (section)
+		return -ERANGE;
+
+	oobregion->length = mtd->oobsize - ecc->total - 2;
+	oobregion->offset = 2;
+
+	return 0;
+}
+
+const struct mtd_ooblayout_ops nand_ooblayout_lp_ops = {
+	.ecc = nand_ooblayout_ecc_lp,
+	.free = nand_ooblayout_free_lp,
+};
+EXPORT_SYMBOL_GPL(nand_ooblayout_lp_ops);
+
 static int check_offs_len(struct mtd_info *mtd,
 					loff_t ofs, uint64_t len)
 {
@@ -4120,21 +4162,24 @@ int nand_scan_tail(struct mtd_info *mtd)
 	chip->oob_poi = chip->buffers->databuf + mtd->writesize;
 
 	/*
+	 * Set the provided ECC layout. If ecc->layout is NULL, the MTD core
+	 * will just leave mtd->ooblayout to NULL, if it's not NULL, it will
+	 * set ->ooblayout to the default ecclayout wrapper.
+	 */
+	mtd_set_ecclayout(mtd, ecc->layout);
+
+	/*
 	 * If no default placement scheme is given, select an appropriate one.
 	 */
-	if (!ecc->layout && (ecc->mode != NAND_ECC_SOFT_BCH)) {
+	if (!mtd->ooblayout && (ecc->mode != NAND_ECC_SOFT_BCH)) {
 		switch (mtd->oobsize) {
 		case 8:
-			ecc->layout = &nand_oob_8;
-			break;
 		case 16:
-			ecc->layout = &nand_oob_16;
+			mtd_set_ooblayout(mtd, &nand_ooblayout_sp_ops);
 			break;
 		case 64:
-			ecc->layout = &nand_oob_64;
-			break;
 		case 128:
-			ecc->layout = &nand_oob_128;
+			mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
 			break;
 		default:
 			pr_warn("No oob scheme defined for oobsize %d\n",
@@ -4288,7 +4333,6 @@ int nand_scan_tail(struct mtd_info *mtd)
 		ecc->write_oob_raw = ecc->write_oob;
 
 	/* propagate ecc info to mtd_info */
-	mtd_set_ecclayout(mtd, ecc->layout);
 	mtd->ecc_strength = ecc->strength;
 	mtd->ecc_step_size = ecc->size;
 
diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index 1b673e1..a9796ba 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -748,6 +748,9 @@ struct nand_chip {
 	void *priv;
 };
 
+extern const struct mtd_ooblayout_ops nand_ooblayout_sp_ops;
+extern const struct mtd_ooblayout_ops nand_ooblayout_lp_ops;
+
 static inline void nand_set_flash_node(struct nand_chip *chip,
 				       struct device_node *np)
 {
-- 
2.5.0

[PATCH v5 18/50] mtd: nand: implement the default mtd_ooblayout_ops

[Boris Brezillon]

Replace the default nand_ecclayout definitions for large and small page
devices with the equivalent mtd_ooblayout_ops.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/mtd/nand/nand_base.c | 148 ++++++++++++++++++++++++++++---------------
 include/linux/mtd/nand.h     |   3 +
 2 files changed, 99 insertions(+), 52 deletions(-)

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 295af79..3d6985e 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -48,50 +48,6 @@
 #include <linux/mtd/partitions.h>
 #include <linux/of_mtd.h>
 
-/* Define default oob placement schemes for large and small page devices */
-static struct nand_ecclayout nand_oob_8 = {
-	.eccbytes = 3,
-	.eccpos = {0, 1, 2},
-	.oobfree = {
-		{.offset = 3,
-		 .length = 2},
-		{.offset = 6,
-		 .length = 2} }
-};
-
-static struct nand_ecclayout nand_oob_16 = {
-	.eccbytes = 6,
-	.eccpos = {0, 1, 2, 3, 6, 7},
-	.oobfree = {
-		{.offset = 8,
-		 . length = 8} }
-};
-
-static struct nand_ecclayout nand_oob_64 = {
-	.eccbytes = 24,
-	.eccpos = {
-		   40, 41, 42, 43, 44, 45, 46, 47,
-		   48, 49, 50, 51, 52, 53, 54, 55,
-		   56, 57, 58, 59, 60, 61, 62, 63},
-	.oobfree = {
-		{.offset = 2,
-		 .length = 38} }
-};
-
-static struct nand_ecclayout nand_oob_128 = {
-	.eccbytes = 48,
-	.eccpos = {
-		   80, 81, 82, 83, 84, 85, 86, 87,
-		   88, 89, 90, 91, 92, 93, 94, 95,
-		   96, 97, 98, 99, 100, 101, 102, 103,
-		   104, 105, 106, 107, 108, 109, 110, 111,
-		   112, 113, 114, 115, 116, 117, 118, 119,
-		   120, 121, 122, 123, 124, 125, 126, 127},
-	.oobfree = {
-		{.offset = 2,
-		 .length = 78} }
-};
-
 static int nand_get_device(struct mtd_info *mtd, int new_state);
 
 static int nand_do_write_oob(struct mtd_info *mtd, loff_t to,
@@ -103,6 +59,92 @@ static int nand_do_write_oob(struct mtd_info *mtd, loff_t to,
  */
 DEFINE_LED_TRIGGER(nand_led_trigger);
 
+/* Define default oob placement schemes for large and small page devices */
+static int nand_ooblayout_ecc_sp(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct nand_ecc_ctrl *ecc = &chip->ecc;
+
+	if (section > 1)
+		return -ERANGE;
+
+	if (!section) {
+		oobregion->offset = 0;
+		oobregion->length = 4;
+	} else {
+		oobregion->offset = 6;
+		oobregion->length = ecc->total - 4;
+	}
+
+	return 0;
+}
+
+static int nand_ooblayout_free_sp(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	if (section > 1)
+		return -ERANGE;
+
+	if (mtd->oobsize == 16) {
+		if (section)
+			return -ERANGE;
+
+		oobregion->length = 8;
+		oobregion->offset = 8;
+	} else {
+		oobregion->length = 2;
+		if (!section)
+			oobregion->offset = 3;
+		else
+			oobregion->offset = 6;
+	}
+
+	return 0;
+}
+
+const struct mtd_ooblayout_ops nand_ooblayout_sp_ops = {
+	.ecc = nand_ooblayout_ecc_sp,
+	.free = nand_ooblayout_free_sp,
+};
+EXPORT_SYMBOL_GPL(nand_ooblayout_sp_ops);
+
+static int nand_ooblayout_ecc_lp(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct nand_ecc_ctrl *ecc = &chip->ecc;
+
+	if (section)
+		return -ERANGE;
+
+	oobregion->length = ecc->total;
+	oobregion->offset = mtd->oobsize - oobregion->length;
+
+	return 0;
+}
+
+static int nand_ooblayout_free_lp(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct nand_ecc_ctrl *ecc = &chip->ecc;
+
+	if (section)
+		return -ERANGE;
+
+	oobregion->length = mtd->oobsize - ecc->total - 2;
+	oobregion->offset = 2;
+
+	return 0;
+}
+
+const struct mtd_ooblayout_ops nand_ooblayout_lp_ops = {
+	.ecc = nand_ooblayout_ecc_lp,
+	.free = nand_ooblayout_free_lp,
+};
+EXPORT_SYMBOL_GPL(nand_ooblayout_lp_ops);
+
 static int check_offs_len(struct mtd_info *mtd,
 					loff_t ofs, uint64_t len)
 {
@@ -4120,21 +4162,24 @@ int nand_scan_tail(struct mtd_info *mtd)
 	chip->oob_poi = chip->buffers->databuf + mtd->writesize;
 
 	/*
+	 * Set the provided ECC layout. If ecc->layout is NULL, the MTD core
+	 * will just leave mtd->ooblayout to NULL, if it's not NULL, it will
+	 * set ->ooblayout to the default ecclayout wrapper.
+	 */
+	mtd_set_ecclayout(mtd, ecc->layout);
+
+	/*
 	 * If no default placement scheme is given, select an appropriate one.
 	 */
-	if (!ecc->layout && (ecc->mode != NAND_ECC_SOFT_BCH)) {
+	if (!mtd->ooblayout && (ecc->mode != NAND_ECC_SOFT_BCH)) {
 		switch (mtd->oobsize) {
 		case 8:
-			ecc->layout = &nand_oob_8;
-			break;
 		case 16:
-			ecc->layout = &nand_oob_16;
+			mtd_set_ooblayout(mtd, &nand_ooblayout_sp_ops);
 			break;
 		case 64:
-			ecc->layout = &nand_oob_64;
-			break;
 		case 128:
-			ecc->layout = &nand_oob_128;
+			mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
 			break;
 		default:
 			pr_warn("No oob scheme defined for oobsize %d\n",
@@ -4288,7 +4333,6 @@ int nand_scan_tail(struct mtd_info *mtd)
 		ecc->write_oob_raw = ecc->write_oob;
 
 	/* propagate ecc info to mtd_info */
-	mtd_set_ecclayout(mtd, ecc->layout);
 	mtd->ecc_strength = ecc->strength;
 	mtd->ecc_step_size = ecc->size;
 
diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index 1b673e1..a9796ba 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -748,6 +748,9 @@ struct nand_chip {
 	void *priv;
 };
 
+extern const struct mtd_ooblayout_ops nand_ooblayout_sp_ops;
+extern const struct mtd_ooblayout_ops nand_ooblayout_lp_ops;
+
 static inline void nand_set_flash_node(struct nand_chip *chip,
 				       struct device_node *np)
 {
-- 
2.5.0

[PATCH v5 18/50] mtd: nand: implement the default mtd_ooblayout_ops

[Boris Brezillon]

Replace the default nand_ecclayout definitions for large and small page
devices with the equivalent mtd_ooblayout_ops.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/nand_base.c | 148 ++++++++++++++++++++++++++++---------------
 include/linux/mtd/nand.h     |   3 +
 2 files changed, 99 insertions(+), 52 deletions(-)

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 295af79..3d6985e 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -48,50 +48,6 @@
 #include <linux/mtd/partitions.h>
 #include <linux/of_mtd.h>
 
-/* Define default oob placement schemes for large and small page devices */
-static struct nand_ecclayout nand_oob_8 = {
-	.eccbytes = 3,
-	.eccpos = {0, 1, 2},
-	.oobfree = {
-		{.offset = 3,
-		 .length = 2},
-		{.offset = 6,
-		 .length = 2} }
-};
-
-static struct nand_ecclayout nand_oob_16 = {
-	.eccbytes = 6,
-	.eccpos = {0, 1, 2, 3, 6, 7},
-	.oobfree = {
-		{.offset = 8,
-		 . length = 8} }
-};
-
-static struct nand_ecclayout nand_oob_64 = {
-	.eccbytes = 24,
-	.eccpos = {
-		   40, 41, 42, 43, 44, 45, 46, 47,
-		   48, 49, 50, 51, 52, 53, 54, 55,
-		   56, 57, 58, 59, 60, 61, 62, 63},
-	.oobfree = {
-		{.offset = 2,
-		 .length = 38} }
-};
-
-static struct nand_ecclayout nand_oob_128 = {
-	.eccbytes = 48,
-	.eccpos = {
-		   80, 81, 82, 83, 84, 85, 86, 87,
-		   88, 89, 90, 91, 92, 93, 94, 95,
-		   96, 97, 98, 99, 100, 101, 102, 103,
-		   104, 105, 106, 107, 108, 109, 110, 111,
-		   112, 113, 114, 115, 116, 117, 118, 119,
-		   120, 121, 122, 123, 124, 125, 126, 127},
-	.oobfree = {
-		{.offset = 2,
-		 .length = 78} }
-};
-
 static int nand_get_device(struct mtd_info *mtd, int new_state);
 
 static int nand_do_write_oob(struct mtd_info *mtd, loff_t to,
@@ -103,6 +59,92 @@ static int nand_do_write_oob(struct mtd_info *mtd, loff_t to,
  */
 DEFINE_LED_TRIGGER(nand_led_trigger);
 
+/* Define default oob placement schemes for large and small page devices */
+static int nand_ooblayout_ecc_sp(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct nand_ecc_ctrl *ecc = &chip->ecc;
+
+	if (section > 1)
+		return -ERANGE;
+
+	if (!section) {
+		oobregion->offset = 0;
+		oobregion->length = 4;
+	} else {
+		oobregion->offset = 6;
+		oobregion->length = ecc->total - 4;
+	}
+
+	return 0;
+}
+
+static int nand_ooblayout_free_sp(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	if (section > 1)
+		return -ERANGE;
+
+	if (mtd->oobsize == 16) {
+		if (section)
+			return -ERANGE;
+
+		oobregion->length = 8;
+		oobregion->offset = 8;
+	} else {
+		oobregion->length = 2;
+		if (!section)
+			oobregion->offset = 3;
+		else
+			oobregion->offset = 6;
+	}
+
+	return 0;
+}
+
+const struct mtd_ooblayout_ops nand_ooblayout_sp_ops = {
+	.ecc = nand_ooblayout_ecc_sp,
+	.free = nand_ooblayout_free_sp,
+};
+EXPORT_SYMBOL_GPL(nand_ooblayout_sp_ops);
+
+static int nand_ooblayout_ecc_lp(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct nand_ecc_ctrl *ecc = &chip->ecc;
+
+	if (section)
+		return -ERANGE;
+
+	oobregion->length = ecc->total;
+	oobregion->offset = mtd->oobsize - oobregion->length;
+
+	return 0;
+}
+
+static int nand_ooblayout_free_lp(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct nand_ecc_ctrl *ecc = &chip->ecc;
+
+	if (section)
+		return -ERANGE;
+
+	oobregion->length = mtd->oobsize - ecc->total - 2;
+	oobregion->offset = 2;
+
+	return 0;
+}
+
+const struct mtd_ooblayout_ops nand_ooblayout_lp_ops = {
+	.ecc = nand_ooblayout_ecc_lp,
+	.free = nand_ooblayout_free_lp,
+};
+EXPORT_SYMBOL_GPL(nand_ooblayout_lp_ops);
+
 static int check_offs_len(struct mtd_info *mtd,
 					loff_t ofs, uint64_t len)
 {
@@ -4120,21 +4162,24 @@ int nand_scan_tail(struct mtd_info *mtd)
 	chip->oob_poi = chip->buffers->databuf + mtd->writesize;
 
 	/*
+	 * Set the provided ECC layout. If ecc->layout is NULL, the MTD core
+	 * will just leave mtd->ooblayout to NULL, if it's not NULL, it will
+	 * set ->ooblayout to the default ecclayout wrapper.
+	 */
+	mtd_set_ecclayout(mtd, ecc->layout);
+
+	/*
 	 * If no default placement scheme is given, select an appropriate one.
 	 */
-	if (!ecc->layout && (ecc->mode != NAND_ECC_SOFT_BCH)) {
+	if (!mtd->ooblayout && (ecc->mode != NAND_ECC_SOFT_BCH)) {
 		switch (mtd->oobsize) {
 		case 8:
-			ecc->layout = &nand_oob_8;
-			break;
 		case 16:
-			ecc->layout = &nand_oob_16;
+			mtd_set_ooblayout(mtd, &nand_ooblayout_sp_ops);
 			break;
 		case 64:
-			ecc->layout = &nand_oob_64;
-			break;
 		case 128:
-			ecc->layout = &nand_oob_128;
+			mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
 			break;
 		default:
 			pr_warn("No oob scheme defined for oobsize %d\n",
@@ -4288,7 +4333,6 @@ int nand_scan_tail(struct mtd_info *mtd)
 		ecc->write_oob_raw = ecc->write_oob;
 
 	/* propagate ecc info to mtd_info */
-	mtd_set_ecclayout(mtd, ecc->layout);
 	mtd->ecc_strength = ecc->strength;
 	mtd->ecc_step_size = ecc->size;
 
diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index 1b673e1..a9796ba 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -748,6 +748,9 @@ struct nand_chip {
 	void *priv;
 };
 
+extern const struct mtd_ooblayout_ops nand_ooblayout_sp_ops;
+extern const struct mtd_ooblayout_ops nand_ooblayout_lp_ops;
+
 static inline void nand_set_flash_node(struct nand_chip *chip,
 				       struct device_node *np)
 {
-- 
2.5.0

[PATCH v5 19/50] mtd: nand: bch: switch to mtd_ooblayout_ops

[Boris Brezillon]

Replace the nand_ecclayout definition by the equivalent mtd_ooblayout_ops
definition.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/nand_bch.c | 33 +++++++++++----------------------
 1 file changed, 11 insertions(+), 22 deletions(-)

diff --git a/drivers/mtd/nand/nand_bch.c b/drivers/mtd/nand/nand_bch.c
index b3039de..e29e75f 100644
--- a/drivers/mtd/nand/nand_bch.c
+++ b/drivers/mtd/nand/nand_bch.c
@@ -32,13 +32,11 @@
 /**
  * struct nand_bch_control - private NAND BCH control structure
  * @bch:       BCH control structure
- * @ecclayout: private ecc layout for this BCH configuration
  * @errloc:    error location array
  * @eccmask:   XOR ecc mask, allows erased pages to be decoded as valid
  */
 struct nand_bch_control {
 	struct bch_control   *bch;
-	struct nand_ecclayout ecclayout;
 	unsigned int         *errloc;
 	unsigned char        *eccmask;
 };
@@ -124,7 +122,6 @@ struct nand_bch_control *nand_bch_init(struct mtd_info *mtd)
 {
 	struct nand_chip *nand = mtd_to_nand(mtd);
 	unsigned int m, t, eccsteps, i;
-	struct nand_ecclayout *layout = nand->ecc.layout;
 	struct nand_bch_control *nbc = NULL;
 	unsigned char *erased_page;
 	unsigned int eccsize = nand->ecc.size;
@@ -161,8 +158,17 @@ struct nand_bch_control *nand_bch_init(struct mtd_info *mtd)
 
 	eccsteps = mtd->writesize/eccsize;
 
+	/*
+	 * Rely on the default ecclayout to ooblayout wrapper provided by MTD
+	 * core if ecc.layout is not NULL.
+	 * FIXME: this should be removed when all callers have moved to the
+	 * mtd_ooblayout_ops approach.
+	 */
+	if (nand->ecc.layout)
+		mtd_set_ecclayout(mtd, nand->ecc.layout);
+
 	/* if no ecc placement scheme was provided, build one */
-	if (!layout) {
+	if (!mtd->ooblayout) {
 
 		/* handle large page devices only */
 		if (mtd->oobsize < 64) {
@@ -171,24 +177,7 @@ struct nand_bch_control *nand_bch_init(struct mtd_info *mtd)
 			goto fail;
 		}
 
-		layout = &nbc->ecclayout;
-		layout->eccbytes = eccsteps*eccbytes;
-
-		/* reserve 2 bytes for bad block marker */
-		if (layout->eccbytes+2 > mtd->oobsize) {
-			printk(KERN_WARNING "no suitable oob scheme available "
-			       "for oobsize %d eccbytes %u\n", mtd->oobsize,
-			       eccbytes);
-			goto fail;
-		}
-		/* put ecc bytes at oob tail */
-		for (i = 0; i < layout->eccbytes; i++)
-			layout->eccpos[i] = mtd->oobsize-layout->eccbytes+i;
-
-		layout->oobfree[0].offset = 2;
-		layout->oobfree[0].length = mtd->oobsize-2-layout->eccbytes;
-
-		nand->ecc.layout = layout;
+		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
 	}
 
 	/* sanity checks */
-- 
2.5.0

[PATCH v5 19/50] mtd: nand: bch: switch to mtd_ooblayout_ops

[Boris Brezillon]

Replace the nand_ecclayout definition by the equivalent mtd_ooblayout_ops
definition.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/mtd/nand/nand_bch.c | 33 +++++++++++----------------------
 1 file changed, 11 insertions(+), 22 deletions(-)

diff --git a/drivers/mtd/nand/nand_bch.c b/drivers/mtd/nand/nand_bch.c
index b3039de..e29e75f 100644
--- a/drivers/mtd/nand/nand_bch.c
+++ b/drivers/mtd/nand/nand_bch.c
@@ -32,13 +32,11 @@
 /**
  * struct nand_bch_control - private NAND BCH control structure
  * @bch:       BCH control structure
- * @ecclayout: private ecc layout for this BCH configuration
  * @errloc:    error location array
  * @eccmask:   XOR ecc mask, allows erased pages to be decoded as valid
  */
 struct nand_bch_control {
 	struct bch_control   *bch;
-	struct nand_ecclayout ecclayout;
 	unsigned int         *errloc;
 	unsigned char        *eccmask;
 };
@@ -124,7 +122,6 @@ struct nand_bch_control *nand_bch_init(struct mtd_info *mtd)
 {
 	struct nand_chip *nand = mtd_to_nand(mtd);
 	unsigned int m, t, eccsteps, i;
-	struct nand_ecclayout *layout = nand->ecc.layout;
 	struct nand_bch_control *nbc = NULL;
 	unsigned char *erased_page;
 	unsigned int eccsize = nand->ecc.size;
@@ -161,8 +158,17 @@ struct nand_bch_control *nand_bch_init(struct mtd_info *mtd)
 
 	eccsteps = mtd->writesize/eccsize;
 
+	/*
+	 * Rely on the default ecclayout to ooblayout wrapper provided by MTD
+	 * core if ecc.layout is not NULL.
+	 * FIXME: this should be removed when all callers have moved to the
+	 * mtd_ooblayout_ops approach.
+	 */
+	if (nand->ecc.layout)
+		mtd_set_ecclayout(mtd, nand->ecc.layout);
+
 	/* if no ecc placement scheme was provided, build one */
-	if (!layout) {
+	if (!mtd->ooblayout) {
 
 		/* handle large page devices only */
 		if (mtd->oobsize < 64) {
@@ -171,24 +177,7 @@ struct nand_bch_control *nand_bch_init(struct mtd_info *mtd)
 			goto fail;
 		}
 
-		layout = &nbc->ecclayout;
-		layout->eccbytes = eccsteps*eccbytes;
-
-		/* reserve 2 bytes for bad block marker */
-		if (layout->eccbytes+2 > mtd->oobsize) {
-			printk(KERN_WARNING "no suitable oob scheme available "
-			       "for oobsize %d eccbytes %u\n", mtd->oobsize,
-			       eccbytes);
-			goto fail;
-		}
-		/* put ecc bytes at oob tail */
-		for (i = 0; i < layout->eccbytes; i++)
-			layout->eccpos[i] = mtd->oobsize-layout->eccbytes+i;
-
-		layout->oobfree[0].offset = 2;
-		layout->oobfree[0].length = mtd->oobsize-2-layout->eccbytes;
-
-		nand->ecc.layout = layout;
+		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
 	}
 
 	/* sanity checks */
-- 
2.5.0

[PATCH v5 19/50] mtd: nand: bch: switch to mtd_ooblayout_ops

[Boris Brezillon]

Replace the nand_ecclayout definition by the equivalent mtd_ooblayout_ops
definition.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/nand_bch.c | 33 +++++++++++----------------------
 1 file changed, 11 insertions(+), 22 deletions(-)

diff --git a/drivers/mtd/nand/nand_bch.c b/drivers/mtd/nand/nand_bch.c
index b3039de..e29e75f 100644
--- a/drivers/mtd/nand/nand_bch.c
+++ b/drivers/mtd/nand/nand_bch.c
@@ -32,13 +32,11 @@
 /**
  * struct nand_bch_control - private NAND BCH control structure
  * @bch:       BCH control structure
- * @ecclayout: private ecc layout for this BCH configuration
  * @errloc:    error location array
  * @eccmask:   XOR ecc mask, allows erased pages to be decoded as valid
  */
 struct nand_bch_control {
 	struct bch_control   *bch;
-	struct nand_ecclayout ecclayout;
 	unsigned int         *errloc;
 	unsigned char        *eccmask;
 };
@@ -124,7 +122,6 @@ struct nand_bch_control *nand_bch_init(struct mtd_info *mtd)
 {
 	struct nand_chip *nand = mtd_to_nand(mtd);
 	unsigned int m, t, eccsteps, i;
-	struct nand_ecclayout *layout = nand->ecc.layout;
 	struct nand_bch_control *nbc = NULL;
 	unsigned char *erased_page;
 	unsigned int eccsize = nand->ecc.size;
@@ -161,8 +158,17 @@ struct nand_bch_control *nand_bch_init(struct mtd_info *mtd)
 
 	eccsteps = mtd->writesize/eccsize;
 
+	/*
+	 * Rely on the default ecclayout to ooblayout wrapper provided by MTD
+	 * core if ecc.layout is not NULL.
+	 * FIXME: this should be removed when all callers have moved to the
+	 * mtd_ooblayout_ops approach.
+	 */
+	if (nand->ecc.layout)
+		mtd_set_ecclayout(mtd, nand->ecc.layout);
+
 	/* if no ecc placement scheme was provided, build one */
-	if (!layout) {
+	if (!mtd->ooblayout) {
 
 		/* handle large page devices only */
 		if (mtd->oobsize < 64) {
@@ -171,24 +177,7 @@ struct nand_bch_control *nand_bch_init(struct mtd_info *mtd)
 			goto fail;
 		}
 
-		layout = &nbc->ecclayout;
-		layout->eccbytes = eccsteps*eccbytes;
-
-		/* reserve 2 bytes for bad block marker */
-		if (layout->eccbytes+2 > mtd->oobsize) {
-			printk(KERN_WARNING "no suitable oob scheme available "
-			       "for oobsize %d eccbytes %u\n", mtd->oobsize,
-			       eccbytes);
-			goto fail;
-		}
-		/* put ecc bytes at oob tail */
-		for (i = 0; i < layout->eccbytes; i++)
-			layout->eccpos[i] = mtd->oobsize-layout->eccbytes+i;
-
-		layout->oobfree[0].offset = 2;
-		layout->oobfree[0].length = mtd->oobsize-2-layout->eccbytes;
-
-		nand->ecc.layout = layout;
+		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
 	}
 
 	/* sanity checks */
-- 
2.5.0

[PATCH v5 20/50] mtd: nand: sharpsl: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 arch/arm/mach-pxa/spitz.c   | 55 ++++++++++++++++++++++++++++++++++++---------
 drivers/mtd/nand/sharpsl.c  |  2 +-
 include/linux/mtd/sharpsl.h |  2 +-
 3 files changed, 47 insertions(+), 12 deletions(-)

diff --git a/arch/arm/mach-pxa/spitz.c b/arch/arm/mach-pxa/spitz.c
index d9578bc..bd7cd8b 100644
--- a/arch/arm/mach-pxa/spitz.c
+++ b/arch/arm/mach-pxa/spitz.c
@@ -763,14 +763,49 @@ static struct nand_bbt_descr spitz_nand_bbt = {
 	.pattern	= scan_ff_pattern
 };
 
-static struct nand_ecclayout akita_oobinfo = {
-	.oobfree	= { {0x08, 0x09} },
-	.eccbytes	= 24,
-	.eccpos		= {
-			0x05, 0x01, 0x02, 0x03, 0x06, 0x07, 0x15, 0x11,
-			0x12, 0x13, 0x16, 0x17, 0x25, 0x21, 0x22, 0x23,
-			0x26, 0x27, 0x35, 0x31, 0x32, 0x33, 0x36, 0x37,
-	},
+static int akita_ooblayout_ecc(struct mtd_info *mtd, int section,
+			       struct mtd_oob_region *oobregion)
+{
+	if (section > 12)
+		return -ERANGE;
+
+	switch (section % 3) {
+	case 0:
+		oobregion->offset = 5;
+		oobregion->length = 1;
+		break;
+
+	case 1:
+		oobregion->offset = 1;
+		oobregion->length = 3;
+		break;
+
+	case 2:
+		oobregion->offset = 6;
+		oobregion->length = 2;
+		break;
+	}
+
+	oobregion->offset += (section / 3) * 0x10;
+
+	return 0;
+}
+
+static int akita_ooblayout_free(struct mtd_info *mtd, int section,
+				struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 8;
+	oobregion->length = 9;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops akita_ooblayout_ops = {
+	.ecc = akita_ooblayout_ecc,
+	.free = akita_ooblayout_free,
 };
 
 static struct sharpsl_nand_platform_data spitz_nand_pdata = {
@@ -804,11 +839,11 @@ static void __init spitz_nand_init(void)
 	} else if (machine_is_akita()) {
 		spitz_nand_partitions[1].size = 58 * 1024 * 1024;
 		spitz_nand_bbt.len = 1;
-		spitz_nand_pdata.ecc_layout = &akita_oobinfo;
+		spitz_nand_pdata.ecc_layout = &akita_ooblayout_ops;
 	} else if (machine_is_borzoi()) {
 		spitz_nand_partitions[1].size = 32 * 1024 * 1024;
 		spitz_nand_bbt.len = 1;
-		spitz_nand_pdata.ecc_layout = &akita_oobinfo;
+		spitz_nand_pdata.ecc_layout = &akita_ooblayout_ops;
 	}
 
 	platform_device_register(&spitz_nand_device);
diff --git a/drivers/mtd/nand/sharpsl.c b/drivers/mtd/nand/sharpsl.c
index b7d1b55..064ca17 100644
--- a/drivers/mtd/nand/sharpsl.c
+++ b/drivers/mtd/nand/sharpsl.c
@@ -148,6 +148,7 @@ static int sharpsl_nand_probe(struct platform_device *pdev)
 	/* Link the private data with the MTD structure */
 	mtd = nand_to_mtd(this);
 	mtd->dev.parent = &pdev->dev;
+	mtd_set_ooblayout(mtd, data->ecc_layout);
 
 	platform_set_drvdata(pdev, sharpsl);
 
@@ -170,7 +171,6 @@ static int sharpsl_nand_probe(struct platform_device *pdev)
 	this->ecc.bytes = 3;
 	this->ecc.strength = 1;
 	this->badblock_pattern = data->badblock_pattern;
-	this->ecc.layout = data->ecc_layout;
 	this->ecc.hwctl = sharpsl_nand_enable_hwecc;
 	this->ecc.calculate = sharpsl_nand_calculate_ecc;
 	this->ecc.correct = nand_correct_data;
diff --git a/include/linux/mtd/sharpsl.h b/include/linux/mtd/sharpsl.h
index 25f4d2a..65e91d0 100644
--- a/include/linux/mtd/sharpsl.h
+++ b/include/linux/mtd/sharpsl.h
@@ -14,7 +14,7 @@
 
 struct sharpsl_nand_platform_data {
 	struct nand_bbt_descr	*badblock_pattern;
-	struct nand_ecclayout	*ecc_layout;
+	const struct mtd_ooblayout_ops *ecc_layout;
 	struct mtd_partition	*partitions;
 	unsigned int		nr_partitions;
 };
-- 
2.5.0

[PATCH v5 20/50] mtd: nand: sharpsl: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 arch/arm/mach-pxa/spitz.c   | 55 ++++++++++++++++++++++++++++++++++++---------
 drivers/mtd/nand/sharpsl.c  |  2 +-
 include/linux/mtd/sharpsl.h |  2 +-
 3 files changed, 47 insertions(+), 12 deletions(-)

diff --git a/arch/arm/mach-pxa/spitz.c b/arch/arm/mach-pxa/spitz.c
index d9578bc..bd7cd8b 100644
--- a/arch/arm/mach-pxa/spitz.c
+++ b/arch/arm/mach-pxa/spitz.c
@@ -763,14 +763,49 @@ static struct nand_bbt_descr spitz_nand_bbt = {
 	.pattern	= scan_ff_pattern
 };
 
-static struct nand_ecclayout akita_oobinfo = {
-	.oobfree	= { {0x08, 0x09} },
-	.eccbytes	= 24,
-	.eccpos		= {
-			0x05, 0x01, 0x02, 0x03, 0x06, 0x07, 0x15, 0x11,
-			0x12, 0x13, 0x16, 0x17, 0x25, 0x21, 0x22, 0x23,
-			0x26, 0x27, 0x35, 0x31, 0x32, 0x33, 0x36, 0x37,
-	},
+static int akita_ooblayout_ecc(struct mtd_info *mtd, int section,
+			       struct mtd_oob_region *oobregion)
+{
+	if (section > 12)
+		return -ERANGE;
+
+	switch (section % 3) {
+	case 0:
+		oobregion->offset = 5;
+		oobregion->length = 1;
+		break;
+
+	case 1:
+		oobregion->offset = 1;
+		oobregion->length = 3;
+		break;
+
+	case 2:
+		oobregion->offset = 6;
+		oobregion->length = 2;
+		break;
+	}
+
+	oobregion->offset += (section / 3) * 0x10;
+
+	return 0;
+}
+
+static int akita_ooblayout_free(struct mtd_info *mtd, int section,
+				struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 8;
+	oobregion->length = 9;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops akita_ooblayout_ops = {
+	.ecc = akita_ooblayout_ecc,
+	.free = akita_ooblayout_free,
 };
 
 static struct sharpsl_nand_platform_data spitz_nand_pdata = {
@@ -804,11 +839,11 @@ static void __init spitz_nand_init(void)
 	} else if (machine_is_akita()) {
 		spitz_nand_partitions[1].size = 58 * 1024 * 1024;
 		spitz_nand_bbt.len = 1;
-		spitz_nand_pdata.ecc_layout = &akita_oobinfo;
+		spitz_nand_pdata.ecc_layout = &akita_ooblayout_ops;
 	} else if (machine_is_borzoi()) {
 		spitz_nand_partitions[1].size = 32 * 1024 * 1024;
 		spitz_nand_bbt.len = 1;
-		spitz_nand_pdata.ecc_layout = &akita_oobinfo;
+		spitz_nand_pdata.ecc_layout = &akita_ooblayout_ops;
 	}
 
 	platform_device_register(&spitz_nand_device);
diff --git a/drivers/mtd/nand/sharpsl.c b/drivers/mtd/nand/sharpsl.c
index b7d1b55..064ca17 100644
--- a/drivers/mtd/nand/sharpsl.c
+++ b/drivers/mtd/nand/sharpsl.c
@@ -148,6 +148,7 @@ static int sharpsl_nand_probe(struct platform_device *pdev)
 	/* Link the private data with the MTD structure */
 	mtd = nand_to_mtd(this);
 	mtd->dev.parent = &pdev->dev;
+	mtd_set_ooblayout(mtd, data->ecc_layout);
 
 	platform_set_drvdata(pdev, sharpsl);
 
@@ -170,7 +171,6 @@ static int sharpsl_nand_probe(struct platform_device *pdev)
 	this->ecc.bytes = 3;
 	this->ecc.strength = 1;
 	this->badblock_pattern = data->badblock_pattern;
-	this->ecc.layout = data->ecc_layout;
 	this->ecc.hwctl = sharpsl_nand_enable_hwecc;
 	this->ecc.calculate = sharpsl_nand_calculate_ecc;
 	this->ecc.correct = nand_correct_data;
diff --git a/include/linux/mtd/sharpsl.h b/include/linux/mtd/sharpsl.h
index 25f4d2a..65e91d0 100644
--- a/include/linux/mtd/sharpsl.h
+++ b/include/linux/mtd/sharpsl.h
@@ -14,7 +14,7 @@
 
 struct sharpsl_nand_platform_data {
 	struct nand_bbt_descr	*badblock_pattern;
-	struct nand_ecclayout	*ecc_layout;
+	const struct mtd_ooblayout_ops *ecc_layout;
 	struct mtd_partition	*partitions;
 	unsigned int		nr_partitions;
 };
-- 
2.5.0

[PATCH v5 20/50] mtd: nand: sharpsl: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 arch/arm/mach-pxa/spitz.c   | 55 ++++++++++++++++++++++++++++++++++++---------
 drivers/mtd/nand/sharpsl.c  |  2 +-
 include/linux/mtd/sharpsl.h |  2 +-
 3 files changed, 47 insertions(+), 12 deletions(-)

diff --git a/arch/arm/mach-pxa/spitz.c b/arch/arm/mach-pxa/spitz.c
index d9578bc..bd7cd8b 100644
--- a/arch/arm/mach-pxa/spitz.c
+++ b/arch/arm/mach-pxa/spitz.c
@@ -763,14 +763,49 @@ static struct nand_bbt_descr spitz_nand_bbt = {
 	.pattern	= scan_ff_pattern
 };
 
-static struct nand_ecclayout akita_oobinfo = {
-	.oobfree	= { {0x08, 0x09} },
-	.eccbytes	= 24,
-	.eccpos		= {
-			0x05, 0x01, 0x02, 0x03, 0x06, 0x07, 0x15, 0x11,
-			0x12, 0x13, 0x16, 0x17, 0x25, 0x21, 0x22, 0x23,
-			0x26, 0x27, 0x35, 0x31, 0x32, 0x33, 0x36, 0x37,
-	},
+static int akita_ooblayout_ecc(struct mtd_info *mtd, int section,
+			       struct mtd_oob_region *oobregion)
+{
+	if (section > 12)
+		return -ERANGE;
+
+	switch (section % 3) {
+	case 0:
+		oobregion->offset = 5;
+		oobregion->length = 1;
+		break;
+
+	case 1:
+		oobregion->offset = 1;
+		oobregion->length = 3;
+		break;
+
+	case 2:
+		oobregion->offset = 6;
+		oobregion->length = 2;
+		break;
+	}
+
+	oobregion->offset += (section / 3) * 0x10;
+
+	return 0;
+}
+
+static int akita_ooblayout_free(struct mtd_info *mtd, int section,
+				struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 8;
+	oobregion->length = 9;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops akita_ooblayout_ops = {
+	.ecc = akita_ooblayout_ecc,
+	.free = akita_ooblayout_free,
 };
 
 static struct sharpsl_nand_platform_data spitz_nand_pdata = {
@@ -804,11 +839,11 @@ static void __init spitz_nand_init(void)
 	} else if (machine_is_akita()) {
 		spitz_nand_partitions[1].size = 58 * 1024 * 1024;
 		spitz_nand_bbt.len = 1;
-		spitz_nand_pdata.ecc_layout = &akita_oobinfo;
+		spitz_nand_pdata.ecc_layout = &akita_ooblayout_ops;
 	} else if (machine_is_borzoi()) {
 		spitz_nand_partitions[1].size = 32 * 1024 * 1024;
 		spitz_nand_bbt.len = 1;
-		spitz_nand_pdata.ecc_layout = &akita_oobinfo;
+		spitz_nand_pdata.ecc_layout = &akita_ooblayout_ops;
 	}
 
 	platform_device_register(&spitz_nand_device);
diff --git a/drivers/mtd/nand/sharpsl.c b/drivers/mtd/nand/sharpsl.c
index b7d1b55..064ca17 100644
--- a/drivers/mtd/nand/sharpsl.c
+++ b/drivers/mtd/nand/sharpsl.c
@@ -148,6 +148,7 @@ static int sharpsl_nand_probe(struct platform_device *pdev)
 	/* Link the private data with the MTD structure */
 	mtd = nand_to_mtd(this);
 	mtd->dev.parent = &pdev->dev;
+	mtd_set_ooblayout(mtd, data->ecc_layout);
 
 	platform_set_drvdata(pdev, sharpsl);
 
@@ -170,7 +171,6 @@ static int sharpsl_nand_probe(struct platform_device *pdev)
 	this->ecc.bytes = 3;
 	this->ecc.strength = 1;
 	this->badblock_pattern = data->badblock_pattern;
-	this->ecc.layout = data->ecc_layout;
 	this->ecc.hwctl = sharpsl_nand_enable_hwecc;
 	this->ecc.calculate = sharpsl_nand_calculate_ecc;
 	this->ecc.correct = nand_correct_data;
diff --git a/include/linux/mtd/sharpsl.h b/include/linux/mtd/sharpsl.h
index 25f4d2a..65e91d0 100644
--- a/include/linux/mtd/sharpsl.h
+++ b/include/linux/mtd/sharpsl.h
@@ -14,7 +14,7 @@
 
 struct sharpsl_nand_platform_data {
 	struct nand_bbt_descr	*badblock_pattern;
-	struct nand_ecclayout	*ecc_layout;
+	const struct mtd_ooblayout_ops *ecc_layout;
 	struct mtd_partition	*partitions;
 	unsigned int		nr_partitions;
 };
-- 
2.5.0

[PATCH v5 21/50] mtd: nand: jz4740: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 arch/mips/include/asm/mach-jz4740/jz4740_nand.h |  2 +-
 arch/mips/jz4740/board-qi_lb60.c                | 87 +++++++++++++++----------
 drivers/mtd/nand/jz4740_nand.c                  |  2 +-
 3 files changed, 53 insertions(+), 38 deletions(-)

diff --git a/arch/mips/include/asm/mach-jz4740/jz4740_nand.h b/arch/mips/include/asm/mach-jz4740/jz4740_nand.h
index 398733e..7f7b0fc 100644
--- a/arch/mips/include/asm/mach-jz4740/jz4740_nand.h
+++ b/arch/mips/include/asm/mach-jz4740/jz4740_nand.h
@@ -27,7 +27,7 @@ struct jz_nand_platform_data {
 
 	unsigned char banks[JZ_NAND_NUM_BANKS];
 
-	void (*ident_callback)(struct platform_device *, struct nand_chip *,
+	void (*ident_callback)(struct platform_device *, struct mtd_info *,
 				struct mtd_partition **, int *num_partitions);
 };
 
diff --git a/arch/mips/jz4740/board-qi_lb60.c b/arch/mips/jz4740/board-qi_lb60.c
index 934b15b..a1c1afb 100644
--- a/arch/mips/jz4740/board-qi_lb60.c
+++ b/arch/mips/jz4740/board-qi_lb60.c
@@ -50,20 +50,6 @@ static bool is_avt2;
 #define QI_LB60_GPIO_KEYIN8		JZ_GPIO_PORTD(26)
 
 /* NAND */
-static struct nand_ecclayout qi_lb60_ecclayout_1gb = {
-	.eccbytes = 36,
-	.eccpos = {
-		6,  7,	8,  9,	10, 11, 12, 13,
-		14, 15, 16, 17, 18, 19, 20, 21,
-		22, 23, 24, 25, 26, 27, 28, 29,
-		30, 31, 32, 33, 34, 35, 36, 37,
-		38, 39, 40, 41
-	},
-	.oobfree = {
-		{ .offset = 2, .length = 4 },
-		{ .offset = 42, .length = 22 }
-	},
-};
 
 /* Early prototypes of the QI LB60 had only 1GB of NAND.
  * In order to support these devices as well the partition and ecc layout is
@@ -86,25 +72,6 @@ static struct mtd_partition qi_lb60_partitions_1gb[] = {
 	},
 };
 
-static struct nand_ecclayout qi_lb60_ecclayout_2gb = {
-	.eccbytes = 72,
-	.eccpos = {
-		12, 13, 14, 15, 16, 17, 18, 19,
-		20, 21, 22, 23, 24, 25, 26, 27,
-		28, 29, 30, 31, 32, 33, 34, 35,
-		36, 37, 38, 39, 40, 41, 42, 43,
-		44, 45, 46, 47, 48, 49, 50, 51,
-		52, 53, 54, 55, 56, 57, 58, 59,
-		60, 61, 62, 63, 64, 65, 66, 67,
-		68, 69, 70, 71, 72, 73, 74, 75,
-		76, 77, 78, 79, 80, 81, 82, 83
-	},
-	.oobfree = {
-		{ .offset = 2, .length = 10 },
-		{ .offset = 84, .length = 44 },
-	},
-};
-
 static struct mtd_partition qi_lb60_partitions_2gb[] = {
 	{
 		.name = "NAND BOOT partition",
@@ -123,19 +90,67 @@ static struct mtd_partition qi_lb60_partitions_2gb[] = {
 	},
 };
 
+static int qi_lb60_ooblayout_ecc(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->length = 36;
+	oobregion->offset = 6;
+
+	if (mtd->oobsize == 128) {
+		oobregion->length *= 2;
+		oobregion->offset *= 2;
+	}
+
+	return 0;
+}
+
+static int qi_lb60_ooblayout_free(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	int eccbytes = 36, eccoff = 6;
+
+	if (section > 1)
+		return -ERANGE;
+
+	if (mtd->oobsize == 128) {
+		eccbytes *= 2;
+		eccoff *= 2;
+	}
+
+	if (!section) {
+		oobregion->offset = 2;
+		oobregion->length = eccoff - 2;
+	} else {
+		oobregion->offset = eccoff + eccbytes;
+		oobregion->length = mtd->oobsize - oobregion->offset;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops qi_lb60_ooblayout_ops = {
+	.ecc = qi_lb60_ooblayout_ecc,
+	.free = qi_lb60_ooblayout_free,
+};
+
 static void qi_lb60_nand_ident(struct platform_device *pdev,
-		struct nand_chip *chip, struct mtd_partition **partitions,
+		struct mtd_info *mtd, struct mtd_partition **partitions,
 		int *num_partitions)
 {
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
 	if (chip->page_shift == 12) {
-		chip->ecc.layout = &qi_lb60_ecclayout_2gb;
 		*partitions = qi_lb60_partitions_2gb;
 		*num_partitions = ARRAY_SIZE(qi_lb60_partitions_2gb);
 	} else {
-		chip->ecc.layout = &qi_lb60_ecclayout_1gb;
 		*partitions = qi_lb60_partitions_1gb;
 		*num_partitions = ARRAY_SIZE(qi_lb60_partitions_1gb);
 	}
+
+	mtd_set_ooblayout(mtd, &qi_lb60_ooblayout_ops);
 }
 
 static struct jz_nand_platform_data qi_lb60_nand_pdata = {
diff --git a/drivers/mtd/nand/jz4740_nand.c b/drivers/mtd/nand/jz4740_nand.c
index 673ceb2..df74408 100644
--- a/drivers/mtd/nand/jz4740_nand.c
+++ b/drivers/mtd/nand/jz4740_nand.c
@@ -476,7 +476,7 @@ static int jz_nand_probe(struct platform_device *pdev)
 	}
 
 	if (pdata && pdata->ident_callback) {
-		pdata->ident_callback(pdev, chip, &pdata->partitions,
+		pdata->ident_callback(pdev, mtd, &pdata->partitions,
 					&pdata->num_partitions);
 	}
 
-- 
2.5.0

[PATCH v5 21/50] mtd: nand: jz4740: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 arch/mips/include/asm/mach-jz4740/jz4740_nand.h |  2 +-
 arch/mips/jz4740/board-qi_lb60.c                | 87 +++++++++++++++----------
 drivers/mtd/nand/jz4740_nand.c                  |  2 +-
 3 files changed, 53 insertions(+), 38 deletions(-)

diff --git a/arch/mips/include/asm/mach-jz4740/jz4740_nand.h b/arch/mips/include/asm/mach-jz4740/jz4740_nand.h
index 398733e..7f7b0fc 100644
--- a/arch/mips/include/asm/mach-jz4740/jz4740_nand.h
+++ b/arch/mips/include/asm/mach-jz4740/jz4740_nand.h
@@ -27,7 +27,7 @@ struct jz_nand_platform_data {
 
 	unsigned char banks[JZ_NAND_NUM_BANKS];
 
-	void (*ident_callback)(struct platform_device *, struct nand_chip *,
+	void (*ident_callback)(struct platform_device *, struct mtd_info *,
 				struct mtd_partition **, int *num_partitions);
 };
 
diff --git a/arch/mips/jz4740/board-qi_lb60.c b/arch/mips/jz4740/board-qi_lb60.c
index 934b15b..a1c1afb 100644
--- a/arch/mips/jz4740/board-qi_lb60.c
+++ b/arch/mips/jz4740/board-qi_lb60.c
@@ -50,20 +50,6 @@ static bool is_avt2;
 #define QI_LB60_GPIO_KEYIN8		JZ_GPIO_PORTD(26)
 
 /* NAND */
-static struct nand_ecclayout qi_lb60_ecclayout_1gb = {
-	.eccbytes = 36,
-	.eccpos = {
-		6,  7,	8,  9,	10, 11, 12, 13,
-		14, 15, 16, 17, 18, 19, 20, 21,
-		22, 23, 24, 25, 26, 27, 28, 29,
-		30, 31, 32, 33, 34, 35, 36, 37,
-		38, 39, 40, 41
-	},
-	.oobfree = {
-		{ .offset = 2, .length = 4 },
-		{ .offset = 42, .length = 22 }
-	},
-};
 
 /* Early prototypes of the QI LB60 had only 1GB of NAND.
  * In order to support these devices as well the partition and ecc layout is
@@ -86,25 +72,6 @@ static struct mtd_partition qi_lb60_partitions_1gb[] = {
 	},
 };
 
-static struct nand_ecclayout qi_lb60_ecclayout_2gb = {
-	.eccbytes = 72,
-	.eccpos = {
-		12, 13, 14, 15, 16, 17, 18, 19,
-		20, 21, 22, 23, 24, 25, 26, 27,
-		28, 29, 30, 31, 32, 33, 34, 35,
-		36, 37, 38, 39, 40, 41, 42, 43,
-		44, 45, 46, 47, 48, 49, 50, 51,
-		52, 53, 54, 55, 56, 57, 58, 59,
-		60, 61, 62, 63, 64, 65, 66, 67,
-		68, 69, 70, 71, 72, 73, 74, 75,
-		76, 77, 78, 79, 80, 81, 82, 83
-	},
-	.oobfree = {
-		{ .offset = 2, .length = 10 },
-		{ .offset = 84, .length = 44 },
-	},
-};
-
 static struct mtd_partition qi_lb60_partitions_2gb[] = {
 	{
 		.name = "NAND BOOT partition",
@@ -123,19 +90,67 @@ static struct mtd_partition qi_lb60_partitions_2gb[] = {
 	},
 };
 
+static int qi_lb60_ooblayout_ecc(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->length = 36;
+	oobregion->offset = 6;
+
+	if (mtd->oobsize == 128) {
+		oobregion->length *= 2;
+		oobregion->offset *= 2;
+	}
+
+	return 0;
+}
+
+static int qi_lb60_ooblayout_free(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	int eccbytes = 36, eccoff = 6;
+
+	if (section > 1)
+		return -ERANGE;
+
+	if (mtd->oobsize == 128) {
+		eccbytes *= 2;
+		eccoff *= 2;
+	}
+
+	if (!section) {
+		oobregion->offset = 2;
+		oobregion->length = eccoff - 2;
+	} else {
+		oobregion->offset = eccoff + eccbytes;
+		oobregion->length = mtd->oobsize - oobregion->offset;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops qi_lb60_ooblayout_ops = {
+	.ecc = qi_lb60_ooblayout_ecc,
+	.free = qi_lb60_ooblayout_free,
+};
+
 static void qi_lb60_nand_ident(struct platform_device *pdev,
-		struct nand_chip *chip, struct mtd_partition **partitions,
+		struct mtd_info *mtd, struct mtd_partition **partitions,
 		int *num_partitions)
 {
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
 	if (chip->page_shift == 12) {
-		chip->ecc.layout = &qi_lb60_ecclayout_2gb;
 		*partitions = qi_lb60_partitions_2gb;
 		*num_partitions = ARRAY_SIZE(qi_lb60_partitions_2gb);
 	} else {
-		chip->ecc.layout = &qi_lb60_ecclayout_1gb;
 		*partitions = qi_lb60_partitions_1gb;
 		*num_partitions = ARRAY_SIZE(qi_lb60_partitions_1gb);
 	}
+
+	mtd_set_ooblayout(mtd, &qi_lb60_ooblayout_ops);
 }
 
 static struct jz_nand_platform_data qi_lb60_nand_pdata = {
diff --git a/drivers/mtd/nand/jz4740_nand.c b/drivers/mtd/nand/jz4740_nand.c
index 673ceb2..df74408 100644
--- a/drivers/mtd/nand/jz4740_nand.c
+++ b/drivers/mtd/nand/jz4740_nand.c
@@ -476,7 +476,7 @@ static int jz_nand_probe(struct platform_device *pdev)
 	}
 
 	if (pdata && pdata->ident_callback) {
-		pdata->ident_callback(pdev, chip, &pdata->partitions,
+		pdata->ident_callback(pdev, mtd, &pdata->partitions,
 					&pdata->num_partitions);
 	}
 
-- 
2.5.0

[PATCH v5 21/50] mtd: nand: jz4740: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 arch/mips/include/asm/mach-jz4740/jz4740_nand.h |  2 +-
 arch/mips/jz4740/board-qi_lb60.c                | 87 +++++++++++++++----------
 drivers/mtd/nand/jz4740_nand.c                  |  2 +-
 3 files changed, 53 insertions(+), 38 deletions(-)

diff --git a/arch/mips/include/asm/mach-jz4740/jz4740_nand.h b/arch/mips/include/asm/mach-jz4740/jz4740_nand.h
index 398733e..7f7b0fc 100644
--- a/arch/mips/include/asm/mach-jz4740/jz4740_nand.h
+++ b/arch/mips/include/asm/mach-jz4740/jz4740_nand.h
@@ -27,7 +27,7 @@ struct jz_nand_platform_data {
 
 	unsigned char banks[JZ_NAND_NUM_BANKS];
 
-	void (*ident_callback)(struct platform_device *, struct nand_chip *,
+	void (*ident_callback)(struct platform_device *, struct mtd_info *,
 				struct mtd_partition **, int *num_partitions);
 };
 
diff --git a/arch/mips/jz4740/board-qi_lb60.c b/arch/mips/jz4740/board-qi_lb60.c
index 934b15b..a1c1afb 100644
--- a/arch/mips/jz4740/board-qi_lb60.c
+++ b/arch/mips/jz4740/board-qi_lb60.c
@@ -50,20 +50,6 @@ static bool is_avt2;
 #define QI_LB60_GPIO_KEYIN8		JZ_GPIO_PORTD(26)
 
 /* NAND */
-static struct nand_ecclayout qi_lb60_ecclayout_1gb = {
-	.eccbytes = 36,
-	.eccpos = {
-		6,  7,	8,  9,	10, 11, 12, 13,
-		14, 15, 16, 17, 18, 19, 20, 21,
-		22, 23, 24, 25, 26, 27, 28, 29,
-		30, 31, 32, 33, 34, 35, 36, 37,
-		38, 39, 40, 41
-	},
-	.oobfree = {
-		{ .offset = 2, .length = 4 },
-		{ .offset = 42, .length = 22 }
-	},
-};
 
 /* Early prototypes of the QI LB60 had only 1GB of NAND.
  * In order to support these devices as well the partition and ecc layout is
@@ -86,25 +72,6 @@ static struct mtd_partition qi_lb60_partitions_1gb[] = {
 	},
 };
 
-static struct nand_ecclayout qi_lb60_ecclayout_2gb = {
-	.eccbytes = 72,
-	.eccpos = {
-		12, 13, 14, 15, 16, 17, 18, 19,
-		20, 21, 22, 23, 24, 25, 26, 27,
-		28, 29, 30, 31, 32, 33, 34, 35,
-		36, 37, 38, 39, 40, 41, 42, 43,
-		44, 45, 46, 47, 48, 49, 50, 51,
-		52, 53, 54, 55, 56, 57, 58, 59,
-		60, 61, 62, 63, 64, 65, 66, 67,
-		68, 69, 70, 71, 72, 73, 74, 75,
-		76, 77, 78, 79, 80, 81, 82, 83
-	},
-	.oobfree = {
-		{ .offset = 2, .length = 10 },
-		{ .offset = 84, .length = 44 },
-	},
-};
-
 static struct mtd_partition qi_lb60_partitions_2gb[] = {
 	{
 		.name = "NAND BOOT partition",
@@ -123,19 +90,67 @@ static struct mtd_partition qi_lb60_partitions_2gb[] = {
 	},
 };
 
+static int qi_lb60_ooblayout_ecc(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->length = 36;
+	oobregion->offset = 6;
+
+	if (mtd->oobsize == 128) {
+		oobregion->length *= 2;
+		oobregion->offset *= 2;
+	}
+
+	return 0;
+}
+
+static int qi_lb60_ooblayout_free(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	int eccbytes = 36, eccoff = 6;
+
+	if (section > 1)
+		return -ERANGE;
+
+	if (mtd->oobsize == 128) {
+		eccbytes *= 2;
+		eccoff *= 2;
+	}
+
+	if (!section) {
+		oobregion->offset = 2;
+		oobregion->length = eccoff - 2;
+	} else {
+		oobregion->offset = eccoff + eccbytes;
+		oobregion->length = mtd->oobsize - oobregion->offset;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops qi_lb60_ooblayout_ops = {
+	.ecc = qi_lb60_ooblayout_ecc,
+	.free = qi_lb60_ooblayout_free,
+};
+
 static void qi_lb60_nand_ident(struct platform_device *pdev,
-		struct nand_chip *chip, struct mtd_partition **partitions,
+		struct mtd_info *mtd, struct mtd_partition **partitions,
 		int *num_partitions)
 {
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
 	if (chip->page_shift == 12) {
-		chip->ecc.layout = &qi_lb60_ecclayout_2gb;
 		*partitions = qi_lb60_partitions_2gb;
 		*num_partitions = ARRAY_SIZE(qi_lb60_partitions_2gb);
 	} else {
-		chip->ecc.layout = &qi_lb60_ecclayout_1gb;
 		*partitions = qi_lb60_partitions_1gb;
 		*num_partitions = ARRAY_SIZE(qi_lb60_partitions_1gb);
 	}
+
+	mtd_set_ooblayout(mtd, &qi_lb60_ooblayout_ops);
 }
 
 static struct jz_nand_platform_data qi_lb60_nand_pdata = {
diff --git a/drivers/mtd/nand/jz4740_nand.c b/drivers/mtd/nand/jz4740_nand.c
index 673ceb2..df74408 100644
--- a/drivers/mtd/nand/jz4740_nand.c
+++ b/drivers/mtd/nand/jz4740_nand.c
@@ -476,7 +476,7 @@ static int jz_nand_probe(struct platform_device *pdev)
 	}
 
 	if (pdata && pdata->ident_callback) {
-		pdata->ident_callback(pdev, chip, &pdata->partitions,
+		pdata->ident_callback(pdev, mtd, &pdata->partitions,
 					&pdata->num_partitions);
 	}
 
-- 
2.5.0

[PATCH v5 22/50] mtd: nand: atmel: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/atmel_nand.c | 84 ++++++++++++++++++++-----------------------
 1 file changed, 38 insertions(+), 46 deletions(-)

diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
index 321d331..46a601e 100644
--- a/drivers/mtd/nand/atmel_nand.c
+++ b/drivers/mtd/nand/atmel_nand.c
@@ -72,30 +72,44 @@ struct atmel_nand_nfc_caps {
 	uint32_t rb_mask;
 };
 
-/* oob layout for large page size
+/*
+ * oob layout for large page size
  * bad block info is on bytes 0 and 1
  * the bytes have to be consecutives to avoid
  * several NAND_CMD_RNDOUT during read
- */
-static struct nand_ecclayout atmel_oobinfo_large = {
-	.eccbytes = 4,
-	.eccpos = {60, 61, 62, 63},
-	.oobfree = {
-		{2, 58}
-	},
-};
-
-/* oob layout for small page size
+ *
+ * oob layout for small page size
  * bad block info is on bytes 4 and 5
  * the bytes have to be consecutives to avoid
  * several NAND_CMD_RNDOUT during read
  */
-static struct nand_ecclayout atmel_oobinfo_small = {
-	.eccbytes = 4,
-	.eccpos = {0, 1, 2, 3},
-	.oobfree = {
-		{6, 10}
-	},
+static int atmel_ooblayout_ecc_sp(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->length = 4;
+	oobregion->offset = 0;
+
+	return 0;
+}
+
+static int atmel_ooblayout_free_sp(struct mtd_info *mtd, int section,
+				   struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 6;
+	oobregion->length = mtd->oobsize - oobregion->offset;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops atmel_ooblayout_sp_ops = {
+	.ecc = atmel_ooblayout_ecc_sp,
+	.free = atmel_ooblayout_free_sp,
 };
 
 struct atmel_nfc {
@@ -163,8 +177,6 @@ struct atmel_nand_host {
 	int			*pmecc_delta;
 };
 
-static struct nand_ecclayout atmel_pmecc_oobinfo;
-
 /*
  * Enable NAND.
  */
@@ -483,22 +495,6 @@ static int pmecc_get_ecc_bytes(int cap, int sector_size)
 	return (m * cap + 7) / 8;
 }
 
-static void pmecc_config_ecc_layout(struct nand_ecclayout *layout,
-				    int oobsize, int ecc_len)
-{
-	int i;
-
-	layout->eccbytes = ecc_len;
-
-	/* ECC will occupy the last ecc_len bytes continuously */
-	for (i = 0; i < ecc_len; i++)
-		layout->eccpos[i] = oobsize - ecc_len + i;
-
-	layout->oobfree[0].offset = PMECC_OOB_RESERVED_BYTES;
-	layout->oobfree[0].length =
-		oobsize - ecc_len - layout->oobfree[0].offset;
-}
-
 static void __iomem *pmecc_get_alpha_to(struct atmel_nand_host *host)
 {
 	int table_size;
@@ -1013,8 +1009,8 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
 {
 	struct nand_chip *nand_chip = mtd_to_nand(mtd);
 	struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
+	int eccbytes = mtd_ooblayout_count_eccbytes(mtd);
 	uint32_t val = 0;
-	struct nand_ecclayout *ecc_layout;
 	struct mtd_oob_region oobregion;
 
 	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST);
@@ -1065,12 +1061,11 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
 		| PMECC_CFG_AUTO_DISABLE);
 	pmecc_writel(host->ecc, CFG, val);
 
-	ecc_layout = nand_chip->ecc.layout;
 	pmecc_writel(host->ecc, SAREA, mtd->oobsize - 1);
 	mtd_ooblayout_ecc(mtd, 0, &oobregion);
 	pmecc_writel(host->ecc, SADDR, oobregion.offset);
 	pmecc_writel(host->ecc, EADDR,
-		     oobregion.offset + ecc_layout->eccbytes - 1);
+		     oobregion.offset + eccbytes - 1);
 	/* See datasheet about PMECC Clock Control Register */
 	pmecc_writel(host->ecc, CLK, 2);
 	pmecc_writel(host->ecc, IDR, 0xff);
@@ -1292,11 +1287,8 @@ static int atmel_pmecc_nand_init_params(struct platform_device *pdev,
 			err_no = -EINVAL;
 			goto err;
 		}
-		pmecc_config_ecc_layout(&atmel_pmecc_oobinfo,
-					mtd->oobsize,
-					nand_chip->ecc.total);
 
-		nand_chip->ecc.layout = &atmel_pmecc_oobinfo;
+		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
 		break;
 	default:
 		dev_warn(host->dev,
@@ -1644,19 +1636,19 @@ static int atmel_hw_nand_init_params(struct platform_device *pdev,
 	/* set ECC page size and oob layout */
 	switch (mtd->writesize) {
 	case 512:
-		nand_chip->ecc.layout = &atmel_oobinfo_small;
+		mtd_set_ooblayout(mtd, &atmel_ooblayout_sp_ops);
 		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_528);
 		break;
 	case 1024:
-		nand_chip->ecc.layout = &atmel_oobinfo_large;
+		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
 		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_1056);
 		break;
 	case 2048:
-		nand_chip->ecc.layout = &atmel_oobinfo_large;
+		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
 		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_2112);
 		break;
 	case 4096:
-		nand_chip->ecc.layout = &atmel_oobinfo_large;
+		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
 		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_4224);
 		break;
 	default:
-- 
2.5.0

[PATCH v5 22/50] mtd: nand: atmel: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/mtd/nand/atmel_nand.c | 84 ++++++++++++++++++++-----------------------
 1 file changed, 38 insertions(+), 46 deletions(-)

diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
index 321d331..46a601e 100644
--- a/drivers/mtd/nand/atmel_nand.c
+++ b/drivers/mtd/nand/atmel_nand.c
@@ -72,30 +72,44 @@ struct atmel_nand_nfc_caps {
 	uint32_t rb_mask;
 };
 
-/* oob layout for large page size
+/*
+ * oob layout for large page size
  * bad block info is on bytes 0 and 1
  * the bytes have to be consecutives to avoid
  * several NAND_CMD_RNDOUT during read
- */
-static struct nand_ecclayout atmel_oobinfo_large = {
-	.eccbytes = 4,
-	.eccpos = {60, 61, 62, 63},
-	.oobfree = {
-		{2, 58}
-	},
-};
-
-/* oob layout for small page size
+ *
+ * oob layout for small page size
  * bad block info is on bytes 4 and 5
  * the bytes have to be consecutives to avoid
  * several NAND_CMD_RNDOUT during read
  */
-static struct nand_ecclayout atmel_oobinfo_small = {
-	.eccbytes = 4,
-	.eccpos = {0, 1, 2, 3},
-	.oobfree = {
-		{6, 10}
-	},
+static int atmel_ooblayout_ecc_sp(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->length = 4;
+	oobregion->offset = 0;
+
+	return 0;
+}
+
+static int atmel_ooblayout_free_sp(struct mtd_info *mtd, int section,
+				   struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 6;
+	oobregion->length = mtd->oobsize - oobregion->offset;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops atmel_ooblayout_sp_ops = {
+	.ecc = atmel_ooblayout_ecc_sp,
+	.free = atmel_ooblayout_free_sp,
 };
 
 struct atmel_nfc {
@@ -163,8 +177,6 @@ struct atmel_nand_host {
 	int			*pmecc_delta;
 };
 
-static struct nand_ecclayout atmel_pmecc_oobinfo;
-
 /*
  * Enable NAND.
  */
@@ -483,22 +495,6 @@ static int pmecc_get_ecc_bytes(int cap, int sector_size)
 	return (m * cap + 7) / 8;
 }
 
-static void pmecc_config_ecc_layout(struct nand_ecclayout *layout,
-				    int oobsize, int ecc_len)
-{
-	int i;
-
-	layout->eccbytes = ecc_len;
-
-	/* ECC will occupy the last ecc_len bytes continuously */
-	for (i = 0; i < ecc_len; i++)
-		layout->eccpos[i] = oobsize - ecc_len + i;
-
-	layout->oobfree[0].offset = PMECC_OOB_RESERVED_BYTES;
-	layout->oobfree[0].length =
-		oobsize - ecc_len - layout->oobfree[0].offset;
-}
-
 static void __iomem *pmecc_get_alpha_to(struct atmel_nand_host *host)
 {
 	int table_size;
@@ -1013,8 +1009,8 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
 {
 	struct nand_chip *nand_chip = mtd_to_nand(mtd);
 	struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
+	int eccbytes = mtd_ooblayout_count_eccbytes(mtd);
 	uint32_t val = 0;
-	struct nand_ecclayout *ecc_layout;
 	struct mtd_oob_region oobregion;
 
 	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST);
@@ -1065,12 +1061,11 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
 		| PMECC_CFG_AUTO_DISABLE);
 	pmecc_writel(host->ecc, CFG, val);
 
-	ecc_layout = nand_chip->ecc.layout;
 	pmecc_writel(host->ecc, SAREA, mtd->oobsize - 1);
 	mtd_ooblayout_ecc(mtd, 0, &oobregion);
 	pmecc_writel(host->ecc, SADDR, oobregion.offset);
 	pmecc_writel(host->ecc, EADDR,
-		     oobregion.offset + ecc_layout->eccbytes - 1);
+		     oobregion.offset + eccbytes - 1);
 	/* See datasheet about PMECC Clock Control Register */
 	pmecc_writel(host->ecc, CLK, 2);
 	pmecc_writel(host->ecc, IDR, 0xff);
@@ -1292,11 +1287,8 @@ static int atmel_pmecc_nand_init_params(struct platform_device *pdev,
 			err_no = -EINVAL;
 			goto err;
 		}
-		pmecc_config_ecc_layout(&atmel_pmecc_oobinfo,
-					mtd->oobsize,
-					nand_chip->ecc.total);
 
-		nand_chip->ecc.layout = &atmel_pmecc_oobinfo;
+		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
 		break;
 	default:
 		dev_warn(host->dev,
@@ -1644,19 +1636,19 @@ static int atmel_hw_nand_init_params(struct platform_device *pdev,
 	/* set ECC page size and oob layout */
 	switch (mtd->writesize) {
 	case 512:
-		nand_chip->ecc.layout = &atmel_oobinfo_small;
+		mtd_set_ooblayout(mtd, &atmel_ooblayout_sp_ops);
 		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_528);
 		break;
 	case 1024:
-		nand_chip->ecc.layout = &atmel_oobinfo_large;
+		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
 		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_1056);
 		break;
 	case 2048:
-		nand_chip->ecc.layout = &atmel_oobinfo_large;
+		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
 		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_2112);
 		break;
 	case 4096:
-		nand_chip->ecc.layout = &atmel_oobinfo_large;
+		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
 		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_4224);
 		break;
 	default:
-- 
2.5.0

[PATCH v5 22/50] mtd: nand: atmel: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/atmel_nand.c | 84 ++++++++++++++++++++-----------------------
 1 file changed, 38 insertions(+), 46 deletions(-)

diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
index 321d331..46a601e 100644
--- a/drivers/mtd/nand/atmel_nand.c
+++ b/drivers/mtd/nand/atmel_nand.c
@@ -72,30 +72,44 @@ struct atmel_nand_nfc_caps {
 	uint32_t rb_mask;
 };
 
-/* oob layout for large page size
+/*
+ * oob layout for large page size
  * bad block info is on bytes 0 and 1
  * the bytes have to be consecutives to avoid
  * several NAND_CMD_RNDOUT during read
- */
-static struct nand_ecclayout atmel_oobinfo_large = {
-	.eccbytes = 4,
-	.eccpos = {60, 61, 62, 63},
-	.oobfree = {
-		{2, 58}
-	},
-};
-
-/* oob layout for small page size
+ *
+ * oob layout for small page size
  * bad block info is on bytes 4 and 5
  * the bytes have to be consecutives to avoid
  * several NAND_CMD_RNDOUT during read
  */
-static struct nand_ecclayout atmel_oobinfo_small = {
-	.eccbytes = 4,
-	.eccpos = {0, 1, 2, 3},
-	.oobfree = {
-		{6, 10}
-	},
+static int atmel_ooblayout_ecc_sp(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->length = 4;
+	oobregion->offset = 0;
+
+	return 0;
+}
+
+static int atmel_ooblayout_free_sp(struct mtd_info *mtd, int section,
+				   struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 6;
+	oobregion->length = mtd->oobsize - oobregion->offset;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops atmel_ooblayout_sp_ops = {
+	.ecc = atmel_ooblayout_ecc_sp,
+	.free = atmel_ooblayout_free_sp,
 };
 
 struct atmel_nfc {
@@ -163,8 +177,6 @@ struct atmel_nand_host {
 	int			*pmecc_delta;
 };
 
-static struct nand_ecclayout atmel_pmecc_oobinfo;
-
 /*
  * Enable NAND.
  */
@@ -483,22 +495,6 @@ static int pmecc_get_ecc_bytes(int cap, int sector_size)
 	return (m * cap + 7) / 8;
 }
 
-static void pmecc_config_ecc_layout(struct nand_ecclayout *layout,
-				    int oobsize, int ecc_len)
-{
-	int i;
-
-	layout->eccbytes = ecc_len;
-
-	/* ECC will occupy the last ecc_len bytes continuously */
-	for (i = 0; i < ecc_len; i++)
-		layout->eccpos[i] = oobsize - ecc_len + i;
-
-	layout->oobfree[0].offset = PMECC_OOB_RESERVED_BYTES;
-	layout->oobfree[0].length =
-		oobsize - ecc_len - layout->oobfree[0].offset;
-}
-
 static void __iomem *pmecc_get_alpha_to(struct atmel_nand_host *host)
 {
 	int table_size;
@@ -1013,8 +1009,8 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
 {
 	struct nand_chip *nand_chip = mtd_to_nand(mtd);
 	struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
+	int eccbytes = mtd_ooblayout_count_eccbytes(mtd);
 	uint32_t val = 0;
-	struct nand_ecclayout *ecc_layout;
 	struct mtd_oob_region oobregion;
 
 	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST);
@@ -1065,12 +1061,11 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
 		| PMECC_CFG_AUTO_DISABLE);
 	pmecc_writel(host->ecc, CFG, val);
 
-	ecc_layout = nand_chip->ecc.layout;
 	pmecc_writel(host->ecc, SAREA, mtd->oobsize - 1);
 	mtd_ooblayout_ecc(mtd, 0, &oobregion);
 	pmecc_writel(host->ecc, SADDR, oobregion.offset);
 	pmecc_writel(host->ecc, EADDR,
-		     oobregion.offset + ecc_layout->eccbytes - 1);
+		     oobregion.offset + eccbytes - 1);
 	/* See datasheet about PMECC Clock Control Register */
 	pmecc_writel(host->ecc, CLK, 2);
 	pmecc_writel(host->ecc, IDR, 0xff);
@@ -1292,11 +1287,8 @@ static int atmel_pmecc_nand_init_params(struct platform_device *pdev,
 			err_no = -EINVAL;
 			goto err;
 		}
-		pmecc_config_ecc_layout(&atmel_pmecc_oobinfo,
-					mtd->oobsize,
-					nand_chip->ecc.total);
 
-		nand_chip->ecc.layout = &atmel_pmecc_oobinfo;
+		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
 		break;
 	default:
 		dev_warn(host->dev,
@@ -1644,19 +1636,19 @@ static int atmel_hw_nand_init_params(struct platform_device *pdev,
 	/* set ECC page size and oob layout */
 	switch (mtd->writesize) {
 	case 512:
-		nand_chip->ecc.layout = &atmel_oobinfo_small;
+		mtd_set_ooblayout(mtd, &atmel_ooblayout_sp_ops);
 		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_528);
 		break;
 	case 1024:
-		nand_chip->ecc.layout = &atmel_oobinfo_large;
+		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
 		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_1056);
 		break;
 	case 2048:
-		nand_chip->ecc.layout = &atmel_oobinfo_large;
+		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
 		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_2112);
 		break;
 	case 4096:
-		nand_chip->ecc.layout = &atmel_oobinfo_large;
+		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
 		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_4224);
 		break;
 	default:
-- 
2.5.0

[PATCH v5 23/50] mtd: nand: bf5xx: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/bf5xx_nand.c | 51 ++++++++++++++++++++++++-------------------
 1 file changed, 28 insertions(+), 23 deletions(-)

diff --git a/drivers/mtd/nand/bf5xx_nand.c b/drivers/mtd/nand/bf5xx_nand.c
index 7f6b30e..b38f414 100644
--- a/drivers/mtd/nand/bf5xx_nand.c
+++ b/drivers/mtd/nand/bf5xx_nand.c
@@ -109,28 +109,33 @@ static const unsigned short bfin_nfc_pin_req[] =
 	 0};
 
 #ifdef CONFIG_MTD_NAND_BF5XX_BOOTROM_ECC
-static struct nand_ecclayout bootrom_ecclayout = {
-	.eccbytes = 24,
-	.eccpos = {
-		0x8 * 0, 0x8 * 0 + 1, 0x8 * 0 + 2,
-		0x8 * 1, 0x8 * 1 + 1, 0x8 * 1 + 2,
-		0x8 * 2, 0x8 * 2 + 1, 0x8 * 2 + 2,
-		0x8 * 3, 0x8 * 3 + 1, 0x8 * 3 + 2,
-		0x8 * 4, 0x8 * 4 + 1, 0x8 * 4 + 2,
-		0x8 * 5, 0x8 * 5 + 1, 0x8 * 5 + 2,
-		0x8 * 6, 0x8 * 6 + 1, 0x8 * 6 + 2,
-		0x8 * 7, 0x8 * 7 + 1, 0x8 * 7 + 2
-	},
-	.oobfree = {
-		{ 0x8 * 0 + 3, 5 },
-		{ 0x8 * 1 + 3, 5 },
-		{ 0x8 * 2 + 3, 5 },
-		{ 0x8 * 3 + 3, 5 },
-		{ 0x8 * 4 + 3, 5 },
-		{ 0x8 * 5 + 3, 5 },
-		{ 0x8 * 6 + 3, 5 },
-		{ 0x8 * 7 + 3, 5 },
-	}
+static int bootrom_ooblayout_ecc(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	if (section > 7)
+		return -ERANGE;
+
+	oobregion->offset = section * 8;
+	oobregion->length = 3;
+
+	return 0;
+}
+
+static int bootrom_ooblayout_free(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	if (section > 7)
+		return -ERANGE;
+
+	oobregion->offset = (section * 8) + 3;
+	oobregion->length = 5;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops bootrom_ooblayout_ops = {
+	.ecc = bootrom_ooblayout_ecc,
+	.free = bootrom_ooblayout_free,
 };
 #endif
 
@@ -800,7 +805,7 @@ static int bf5xx_nand_probe(struct platform_device *pdev)
 	/* setup hardware ECC data struct */
 	if (hardware_ecc) {
 #ifdef CONFIG_MTD_NAND_BF5XX_BOOTROM_ECC
-		chip->ecc.layout = &bootrom_ecclayout;
+		mtd_set_ooblayout(mtd, &bootrom_ooblayout_ops);
 #endif
 		chip->read_buf      = bf5xx_nand_dma_read_buf;
 		chip->write_buf     = bf5xx_nand_dma_write_buf;
-- 
2.5.0

[PATCH v5 23/50] mtd: nand: bf5xx: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/mtd/nand/bf5xx_nand.c | 51 ++++++++++++++++++++++++-------------------
 1 file changed, 28 insertions(+), 23 deletions(-)

diff --git a/drivers/mtd/nand/bf5xx_nand.c b/drivers/mtd/nand/bf5xx_nand.c
index 7f6b30e..b38f414 100644
--- a/drivers/mtd/nand/bf5xx_nand.c
+++ b/drivers/mtd/nand/bf5xx_nand.c
@@ -109,28 +109,33 @@ static const unsigned short bfin_nfc_pin_req[] =
 	 0};
 
 #ifdef CONFIG_MTD_NAND_BF5XX_BOOTROM_ECC
-static struct nand_ecclayout bootrom_ecclayout = {
-	.eccbytes = 24,
-	.eccpos = {
-		0x8 * 0, 0x8 * 0 + 1, 0x8 * 0 + 2,
-		0x8 * 1, 0x8 * 1 + 1, 0x8 * 1 + 2,
-		0x8 * 2, 0x8 * 2 + 1, 0x8 * 2 + 2,
-		0x8 * 3, 0x8 * 3 + 1, 0x8 * 3 + 2,
-		0x8 * 4, 0x8 * 4 + 1, 0x8 * 4 + 2,
-		0x8 * 5, 0x8 * 5 + 1, 0x8 * 5 + 2,
-		0x8 * 6, 0x8 * 6 + 1, 0x8 * 6 + 2,
-		0x8 * 7, 0x8 * 7 + 1, 0x8 * 7 + 2
-	},
-	.oobfree = {
-		{ 0x8 * 0 + 3, 5 },
-		{ 0x8 * 1 + 3, 5 },
-		{ 0x8 * 2 + 3, 5 },
-		{ 0x8 * 3 + 3, 5 },
-		{ 0x8 * 4 + 3, 5 },
-		{ 0x8 * 5 + 3, 5 },
-		{ 0x8 * 6 + 3, 5 },
-		{ 0x8 * 7 + 3, 5 },
-	}
+static int bootrom_ooblayout_ecc(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	if (section > 7)
+		return -ERANGE;
+
+	oobregion->offset = section * 8;
+	oobregion->length = 3;
+
+	return 0;
+}
+
+static int bootrom_ooblayout_free(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	if (section > 7)
+		return -ERANGE;
+
+	oobregion->offset = (section * 8) + 3;
+	oobregion->length = 5;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops bootrom_ooblayout_ops = {
+	.ecc = bootrom_ooblayout_ecc,
+	.free = bootrom_ooblayout_free,
 };
 #endif
 
@@ -800,7 +805,7 @@ static int bf5xx_nand_probe(struct platform_device *pdev)
 	/* setup hardware ECC data struct */
 	if (hardware_ecc) {
 #ifdef CONFIG_MTD_NAND_BF5XX_BOOTROM_ECC
-		chip->ecc.layout = &bootrom_ecclayout;
+		mtd_set_ooblayout(mtd, &bootrom_ooblayout_ops);
 #endif
 		chip->read_buf      = bf5xx_nand_dma_read_buf;
 		chip->write_buf     = bf5xx_nand_dma_write_buf;
-- 
2.5.0

[PATCH v5 23/50] mtd: nand: bf5xx: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/bf5xx_nand.c | 51 ++++++++++++++++++++++++-------------------
 1 file changed, 28 insertions(+), 23 deletions(-)

diff --git a/drivers/mtd/nand/bf5xx_nand.c b/drivers/mtd/nand/bf5xx_nand.c
index 7f6b30e..b38f414 100644
--- a/drivers/mtd/nand/bf5xx_nand.c
+++ b/drivers/mtd/nand/bf5xx_nand.c
@@ -109,28 +109,33 @@ static const unsigned short bfin_nfc_pin_req[] =
 	 0};
 
 #ifdef CONFIG_MTD_NAND_BF5XX_BOOTROM_ECC
-static struct nand_ecclayout bootrom_ecclayout = {
-	.eccbytes = 24,
-	.eccpos = {
-		0x8 * 0, 0x8 * 0 + 1, 0x8 * 0 + 2,
-		0x8 * 1, 0x8 * 1 + 1, 0x8 * 1 + 2,
-		0x8 * 2, 0x8 * 2 + 1, 0x8 * 2 + 2,
-		0x8 * 3, 0x8 * 3 + 1, 0x8 * 3 + 2,
-		0x8 * 4, 0x8 * 4 + 1, 0x8 * 4 + 2,
-		0x8 * 5, 0x8 * 5 + 1, 0x8 * 5 + 2,
-		0x8 * 6, 0x8 * 6 + 1, 0x8 * 6 + 2,
-		0x8 * 7, 0x8 * 7 + 1, 0x8 * 7 + 2
-	},
-	.oobfree = {
-		{ 0x8 * 0 + 3, 5 },
-		{ 0x8 * 1 + 3, 5 },
-		{ 0x8 * 2 + 3, 5 },
-		{ 0x8 * 3 + 3, 5 },
-		{ 0x8 * 4 + 3, 5 },
-		{ 0x8 * 5 + 3, 5 },
-		{ 0x8 * 6 + 3, 5 },
-		{ 0x8 * 7 + 3, 5 },
-	}
+static int bootrom_ooblayout_ecc(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	if (section > 7)
+		return -ERANGE;
+
+	oobregion->offset = section * 8;
+	oobregion->length = 3;
+
+	return 0;
+}
+
+static int bootrom_ooblayout_free(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	if (section > 7)
+		return -ERANGE;
+
+	oobregion->offset = (section * 8) + 3;
+	oobregion->length = 5;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops bootrom_ooblayout_ops = {
+	.ecc = bootrom_ooblayout_ecc,
+	.free = bootrom_ooblayout_free,
 };
 #endif
 
@@ -800,7 +805,7 @@ static int bf5xx_nand_probe(struct platform_device *pdev)
 	/* setup hardware ECC data struct */
 	if (hardware_ecc) {
 #ifdef CONFIG_MTD_NAND_BF5XX_BOOTROM_ECC
-		chip->ecc.layout = &bootrom_ecclayout;
+		mtd_set_ooblayout(mtd, &bootrom_ooblayout_ops);
 #endif
 		chip->read_buf      = bf5xx_nand_dma_read_buf;
 		chip->write_buf     = bf5xx_nand_dma_write_buf;
-- 
2.5.0

[PATCH v5 24/50] mtd: nand: brcm: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/brcmnand/brcmnand.c | 258 +++++++++++++++++++++--------------
 1 file changed, 157 insertions(+), 101 deletions(-)

diff --git a/drivers/mtd/nand/brcmnand/brcmnand.c b/drivers/mtd/nand/brcmnand/brcmnand.c
index e052839..4c3c0a9 100644
--- a/drivers/mtd/nand/brcmnand/brcmnand.c
+++ b/drivers/mtd/nand/brcmnand/brcmnand.c
@@ -781,127 +781,183 @@ static inline bool is_hamming_ecc(struct brcmnand_cfg *cfg)
 }
 
 /*
- * Returns a nand_ecclayout strucutre for the given layout/configuration.
- * Returns NULL on failure.
+ * Set mtd->ooblayout to the appropriate mtd_ooblayout_ops given
+ * the layout/configuration.
+ * Returns -ERRCODE on failure.
  */
-static struct nand_ecclayout *brcmnand_create_layout(int ecc_level,
-						     struct brcmnand_host *host)
+static int brcmnand_hamming_ooblayout_ecc(struct mtd_info *mtd, int section,
+					  struct mtd_oob_region *oobregion)
 {
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct brcmnand_host *host = nand_get_controller_data(chip);
 	struct brcmnand_cfg *cfg = &host->hwcfg;
-	int i, j;
-	struct nand_ecclayout *layout;
-	int req;
-	int sectors;
-	int sas;
-	int idx1, idx2;
-
-	layout = devm_kzalloc(&host->pdev->dev, sizeof(*layout), GFP_KERNEL);
-	if (!layout)
-		return NULL;
-
-	sectors = cfg->page_size / (512 << cfg->sector_size_1k);
-	sas = cfg->spare_area_size << cfg->sector_size_1k;
-
-	/* Hamming */
-	if (is_hamming_ecc(cfg)) {
-		for (i = 0, idx1 = 0, idx2 = 0; i < sectors; i++) {
-			/* First sector of each page may have BBI */
-			if (i == 0) {
-				layout->oobfree[idx2].offset = i * sas + 1;
-				/* Small-page NAND use byte 6 for BBI */
-				if (cfg->page_size == 512)
-					layout->oobfree[idx2].offset--;
-				layout->oobfree[idx2].length = 5;
-			} else {
-				layout->oobfree[idx2].offset = i * sas;
-				layout->oobfree[idx2].length = 6;
-			}
-			idx2++;
-			layout->eccpos[idx1++] = i * sas + 6;
-			layout->eccpos[idx1++] = i * sas + 7;
-			layout->eccpos[idx1++] = i * sas + 8;
-			layout->oobfree[idx2].offset = i * sas + 9;
-			layout->oobfree[idx2].length = 7;
-			idx2++;
-			/* Leave zero-terminated entry for OOBFREE */
-			if (idx1 >= MTD_MAX_ECCPOS_ENTRIES_LARGE ||
-				    idx2 >= MTD_MAX_OOBFREE_ENTRIES_LARGE - 1)
-				break;
-		}
+	int sas = cfg->spare_area_size << cfg->sector_size_1k;
+	int sectors = cfg->page_size / (512 << cfg->sector_size_1k);
 
-		return layout;
-	}
+	if (section >= sectors)
+		return -ERANGE;
 
-	/*
-	 * CONTROLLER_VERSION:
-	 *   < v5.0: ECC_REQ = ceil(BCH_T * 13/8)
-	 *  >= v5.0: ECC_REQ = ceil(BCH_T * 14/8)
-	 * But we will just be conservative.
-	 */
-	req = DIV_ROUND_UP(ecc_level * 14, 8);
-	if (req >= sas) {
-		dev_err(&host->pdev->dev,
-			"error: ECC too large for OOB (ECC bytes %d, spare sector %d)\n",
-			req, sas);
-		return NULL;
-	}
+	oobregion->offset = (section * sas) + 6;
+	oobregion->length = 3;
+
+	return 0;
+}
+
+static int brcmnand_hamming_ooblayout_free(struct mtd_info *mtd, int section,
+					   struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct brcmnand_host *host = nand_get_controller_data(chip);
+	struct brcmnand_cfg *cfg = &host->hwcfg;
+	int sas = cfg->spare_area_size << cfg->sector_size_1k;
+	int sectors = cfg->page_size / (512 << cfg->sector_size_1k);
+
+	if (section >= sectors * 2)
+		return -ERANGE;
 
-	layout->eccbytes = req * sectors;
-	for (i = 0, idx1 = 0, idx2 = 0; i < sectors; i++) {
-		for (j = sas - req; j < sas && idx1 <
-				MTD_MAX_ECCPOS_ENTRIES_LARGE; j++, idx1++)
-			layout->eccpos[idx1] = i * sas + j;
+	oobregion->offset = (section / 2) * sas;
+
+	if (section & 1) {
+		oobregion->offset += 9;
+		oobregion->length = 7;
+	} else {
+		oobregion->length = 6;
 
 		/* First sector of each page may have BBI */
-		if (i == 0) {
-			if (cfg->page_size == 512 && (sas - req >= 6)) {
-				/* Small-page NAND use byte 6 for BBI */
-				layout->oobfree[idx2].offset = 0;
-				layout->oobfree[idx2].length = 5;
-				idx2++;
-				if (sas - req > 6) {
-					layout->oobfree[idx2].offset = 6;
-					layout->oobfree[idx2].length =
-						sas - req - 6;
-					idx2++;
-				}
-			} else if (sas > req + 1) {
-				layout->oobfree[idx2].offset = i * sas + 1;
-				layout->oobfree[idx2].length = sas - req - 1;
-				idx2++;
-			}
-		} else if (sas > req) {
-			layout->oobfree[idx2].offset = i * sas;
-			layout->oobfree[idx2].length = sas - req;
-			idx2++;
+		if (!section) {
+			/*
+			 * Small-page NAND use byte 6 for BBI while large-page
+			 * NAND use byte 0.
+			 */
+			if (cfg->page_size > 512)
+				oobregion->offset++;
+			oobregion->length--;
 		}
-		/* Leave zero-terminated entry for OOBFREE */
-		if (idx1 >= MTD_MAX_ECCPOS_ENTRIES_LARGE ||
-				idx2 >= MTD_MAX_OOBFREE_ENTRIES_LARGE - 1)
-			break;
 	}
 
-	return layout;
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops brcmnand_hamming_ooblayout_ops = {
+	.ecc = brcmnand_hamming_ooblayout_ecc,
+	.free = brcmnand_hamming_ooblayout_free,
+};
+
+static int brcmnand_bch_ooblayout_ecc(struct mtd_info *mtd, int section,
+				      struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct brcmnand_host *host = nand_get_controller_data(chip);
+	struct brcmnand_cfg *cfg = &host->hwcfg;
+	int sas = cfg->spare_area_size << cfg->sector_size_1k;
+	int sectors = cfg->page_size / (512 << cfg->sector_size_1k);
+
+	if (section >= sectors)
+		return -ERANGE;
+
+	oobregion->offset = (section * (sas + 1)) - chip->ecc.bytes;
+	oobregion->length = chip->ecc.bytes;
+
+	return 0;
 }
 
-static struct nand_ecclayout *brcmstb_choose_ecc_layout(
-		struct brcmnand_host *host)
+static int brcmnand_bch_ooblayout_free_lp(struct mtd_info *mtd, int section,
+					  struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct brcmnand_host *host = nand_get_controller_data(chip);
+	struct brcmnand_cfg *cfg = &host->hwcfg;
+	int sas = cfg->spare_area_size << cfg->sector_size_1k;
+	int sectors = cfg->page_size / (512 << cfg->sector_size_1k);
+
+	if (section >= sectors)
+		return -ERANGE;
+
+	if (sas <= chip->ecc.bytes)
+		return 0;
+
+	oobregion->offset = section * sas;
+	oobregion->length = sas - chip->ecc.bytes;
+
+	if (!section) {
+		oobregion->offset++;
+		oobregion->length--;
+	}
+
+	return 0;
+}
+
+static int brcmnand_bch_ooblayout_free_sp(struct mtd_info *mtd, int section,
+					  struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct brcmnand_host *host = nand_get_controller_data(chip);
+	struct brcmnand_cfg *cfg = &host->hwcfg;
+	int sas = cfg->spare_area_size << cfg->sector_size_1k;
+
+	if (section > 1 || sas - chip->ecc.bytes < 6 ||
+	    (section && sas - chip->ecc.bytes == 6))
+		return -ERANGE;
+
+	if (!section) {
+		oobregion->offset = 0;
+		oobregion->length = 5;
+	} else {
+		oobregion->offset = 6;
+		oobregion->length = sas - chip->ecc.bytes - 6;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops brcmnand_bch_lp_ooblayout_ops = {
+	.ecc = brcmnand_bch_ooblayout_ecc,
+	.free = brcmnand_bch_ooblayout_free_lp,
+};
+
+static const struct mtd_ooblayout_ops brcmnand_bch_sp_ooblayout_ops = {
+	.ecc = brcmnand_bch_ooblayout_ecc,
+	.free = brcmnand_bch_ooblayout_free_sp,
+};
+
+static int brcmstb_choose_ecc_layout(struct brcmnand_host *host)
 {
-	struct nand_ecclayout *layout;
 	struct brcmnand_cfg *p = &host->hwcfg;
+	struct mtd_info *mtd = nand_to_mtd(&host->chip);
+	struct nand_ecc_ctrl *ecc = &host->chip.ecc;
 	unsigned int ecc_level = p->ecc_level;
+	int sas = p->spare_area_size << p->sector_size_1k;
+	int sectors = p->page_size / (512 << p->sector_size_1k);
 
 	if (p->sector_size_1k)
 		ecc_level <<= 1;
 
-	layout = brcmnand_create_layout(ecc_level, host);
-	if (!layout) {
+	if (is_hamming_ecc(p)) {
+		ecc->bytes = 3 * sectors;
+		mtd_set_ooblayout(mtd, &brcmnand_hamming_ooblayout_ops);
+		return 0;
+	}
+
+	/*
+	 * CONTROLLER_VERSION:
+	 *   < v5.0: ECC_REQ = ceil(BCH_T * 13/8)
+	 *  >= v5.0: ECC_REQ = ceil(BCH_T * 14/8)
+	 * But we will just be conservative.
+	 */
+	ecc->bytes = DIV_ROUND_UP(ecc_level * 14, 8);
+	if (p->page_size == 512)
+		mtd_set_ooblayout(mtd, &brcmnand_bch_sp_ooblayout_ops);
+	else
+		mtd_set_ooblayout(mtd, &brcmnand_bch_lp_ooblayout_ops);
+
+	if (ecc->bytes >= sas) {
 		dev_err(&host->pdev->dev,
-				"no proper ecc_layout for this NAND cfg\n");
-		return NULL;
+			"error: ECC too large for OOB (ECC bytes %d, spare sector %d)\n",
+			ecc->bytes, sas);
+		return -EINVAL;
 	}
 
-	return layout;
+	return 0;
 }
 
 static void brcmnand_wp(struct mtd_info *mtd, int wp)
@@ -2011,9 +2067,9 @@ static int brcmnand_init_cs(struct brcmnand_host *host, struct device_node *dn)
 	/* only use our internal HW threshold */
 	mtd->bitflip_threshold = 1;
 
-	chip->ecc.layout = brcmstb_choose_ecc_layout(host);
-	if (!chip->ecc.layout)
-		return -ENXIO;
+	ret = brcmstb_choose_ecc_layout(host);
+	if (ret)
+		return ret;
 
 	if (nand_scan_tail(mtd))
 		return -ENXIO;
-- 
2.5.0

[PATCH v5 24/50] mtd: nand: brcm: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/mtd/nand/brcmnand/brcmnand.c | 258 +++++++++++++++++++++--------------
 1 file changed, 157 insertions(+), 101 deletions(-)

diff --git a/drivers/mtd/nand/brcmnand/brcmnand.c b/drivers/mtd/nand/brcmnand/brcmnand.c
index e052839..4c3c0a9 100644
--- a/drivers/mtd/nand/brcmnand/brcmnand.c
+++ b/drivers/mtd/nand/brcmnand/brcmnand.c
@@ -781,127 +781,183 @@ static inline bool is_hamming_ecc(struct brcmnand_cfg *cfg)
 }
 
 /*
- * Returns a nand_ecclayout strucutre for the given layout/configuration.
- * Returns NULL on failure.
+ * Set mtd->ooblayout to the appropriate mtd_ooblayout_ops given
+ * the layout/configuration.
+ * Returns -ERRCODE on failure.
  */
-static struct nand_ecclayout *brcmnand_create_layout(int ecc_level,
-						     struct brcmnand_host *host)
+static int brcmnand_hamming_ooblayout_ecc(struct mtd_info *mtd, int section,
+					  struct mtd_oob_region *oobregion)
 {
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct brcmnand_host *host = nand_get_controller_data(chip);
 	struct brcmnand_cfg *cfg = &host->hwcfg;
-	int i, j;
-	struct nand_ecclayout *layout;
-	int req;
-	int sectors;
-	int sas;
-	int idx1, idx2;
-
-	layout = devm_kzalloc(&host->pdev->dev, sizeof(*layout), GFP_KERNEL);
-	if (!layout)
-		return NULL;
-
-	sectors = cfg->page_size / (512 << cfg->sector_size_1k);
-	sas = cfg->spare_area_size << cfg->sector_size_1k;
-
-	/* Hamming */
-	if (is_hamming_ecc(cfg)) {
-		for (i = 0, idx1 = 0, idx2 = 0; i < sectors; i++) {
-			/* First sector of each page may have BBI */
-			if (i == 0) {
-				layout->oobfree[idx2].offset = i * sas + 1;
-				/* Small-page NAND use byte 6 for BBI */
-				if (cfg->page_size == 512)
-					layout->oobfree[idx2].offset--;
-				layout->oobfree[idx2].length = 5;
-			} else {
-				layout->oobfree[idx2].offset = i * sas;
-				layout->oobfree[idx2].length = 6;
-			}
-			idx2++;
-			layout->eccpos[idx1++] = i * sas + 6;
-			layout->eccpos[idx1++] = i * sas + 7;
-			layout->eccpos[idx1++] = i * sas + 8;
-			layout->oobfree[idx2].offset = i * sas + 9;
-			layout->oobfree[idx2].length = 7;
-			idx2++;
-			/* Leave zero-terminated entry for OOBFREE */
-			if (idx1 >= MTD_MAX_ECCPOS_ENTRIES_LARGE ||
-				    idx2 >= MTD_MAX_OOBFREE_ENTRIES_LARGE - 1)
-				break;
-		}
+	int sas = cfg->spare_area_size << cfg->sector_size_1k;
+	int sectors = cfg->page_size / (512 << cfg->sector_size_1k);
 
-		return layout;
-	}
+	if (section >= sectors)
+		return -ERANGE;
 
-	/*
-	 * CONTROLLER_VERSION:
-	 *   < v5.0: ECC_REQ = ceil(BCH_T * 13/8)
-	 *  >= v5.0: ECC_REQ = ceil(BCH_T * 14/8)
-	 * But we will just be conservative.
-	 */
-	req = DIV_ROUND_UP(ecc_level * 14, 8);
-	if (req >= sas) {
-		dev_err(&host->pdev->dev,
-			"error: ECC too large for OOB (ECC bytes %d, spare sector %d)\n",
-			req, sas);
-		return NULL;
-	}
+	oobregion->offset = (section * sas) + 6;
+	oobregion->length = 3;
+
+	return 0;
+}
+
+static int brcmnand_hamming_ooblayout_free(struct mtd_info *mtd, int section,
+					   struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct brcmnand_host *host = nand_get_controller_data(chip);
+	struct brcmnand_cfg *cfg = &host->hwcfg;
+	int sas = cfg->spare_area_size << cfg->sector_size_1k;
+	int sectors = cfg->page_size / (512 << cfg->sector_size_1k);
+
+	if (section >= sectors * 2)
+		return -ERANGE;
 
-	layout->eccbytes = req * sectors;
-	for (i = 0, idx1 = 0, idx2 = 0; i < sectors; i++) {
-		for (j = sas - req; j < sas && idx1 <
-				MTD_MAX_ECCPOS_ENTRIES_LARGE; j++, idx1++)
-			layout->eccpos[idx1] = i * sas + j;
+	oobregion->offset = (section / 2) * sas;
+
+	if (section & 1) {
+		oobregion->offset += 9;
+		oobregion->length = 7;
+	} else {
+		oobregion->length = 6;
 
 		/* First sector of each page may have BBI */
-		if (i == 0) {
-			if (cfg->page_size == 512 && (sas - req >= 6)) {
-				/* Small-page NAND use byte 6 for BBI */
-				layout->oobfree[idx2].offset = 0;
-				layout->oobfree[idx2].length = 5;
-				idx2++;
-				if (sas - req > 6) {
-					layout->oobfree[idx2].offset = 6;
-					layout->oobfree[idx2].length =
-						sas - req - 6;
-					idx2++;
-				}
-			} else if (sas > req + 1) {
-				layout->oobfree[idx2].offset = i * sas + 1;
-				layout->oobfree[idx2].length = sas - req - 1;
-				idx2++;
-			}
-		} else if (sas > req) {
-			layout->oobfree[idx2].offset = i * sas;
-			layout->oobfree[idx2].length = sas - req;
-			idx2++;
+		if (!section) {
+			/*
+			 * Small-page NAND use byte 6 for BBI while large-page
+			 * NAND use byte 0.
+			 */
+			if (cfg->page_size > 512)
+				oobregion->offset++;
+			oobregion->length--;
 		}
-		/* Leave zero-terminated entry for OOBFREE */
-		if (idx1 >= MTD_MAX_ECCPOS_ENTRIES_LARGE ||
-				idx2 >= MTD_MAX_OOBFREE_ENTRIES_LARGE - 1)
-			break;
 	}
 
-	return layout;
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops brcmnand_hamming_ooblayout_ops = {
+	.ecc = brcmnand_hamming_ooblayout_ecc,
+	.free = brcmnand_hamming_ooblayout_free,
+};
+
+static int brcmnand_bch_ooblayout_ecc(struct mtd_info *mtd, int section,
+				      struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct brcmnand_host *host = nand_get_controller_data(chip);
+	struct brcmnand_cfg *cfg = &host->hwcfg;
+	int sas = cfg->spare_area_size << cfg->sector_size_1k;
+	int sectors = cfg->page_size / (512 << cfg->sector_size_1k);
+
+	if (section >= sectors)
+		return -ERANGE;
+
+	oobregion->offset = (section * (sas + 1)) - chip->ecc.bytes;
+	oobregion->length = chip->ecc.bytes;
+
+	return 0;
 }
 
-static struct nand_ecclayout *brcmstb_choose_ecc_layout(
-		struct brcmnand_host *host)
+static int brcmnand_bch_ooblayout_free_lp(struct mtd_info *mtd, int section,
+					  struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct brcmnand_host *host = nand_get_controller_data(chip);
+	struct brcmnand_cfg *cfg = &host->hwcfg;
+	int sas = cfg->spare_area_size << cfg->sector_size_1k;
+	int sectors = cfg->page_size / (512 << cfg->sector_size_1k);
+
+	if (section >= sectors)
+		return -ERANGE;
+
+	if (sas <= chip->ecc.bytes)
+		return 0;
+
+	oobregion->offset = section * sas;
+	oobregion->length = sas - chip->ecc.bytes;
+
+	if (!section) {
+		oobregion->offset++;
+		oobregion->length--;
+	}
+
+	return 0;
+}
+
+static int brcmnand_bch_ooblayout_free_sp(struct mtd_info *mtd, int section,
+					  struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct brcmnand_host *host = nand_get_controller_data(chip);
+	struct brcmnand_cfg *cfg = &host->hwcfg;
+	int sas = cfg->spare_area_size << cfg->sector_size_1k;
+
+	if (section > 1 || sas - chip->ecc.bytes < 6 ||
+	    (section && sas - chip->ecc.bytes == 6))
+		return -ERANGE;
+
+	if (!section) {
+		oobregion->offset = 0;
+		oobregion->length = 5;
+	} else {
+		oobregion->offset = 6;
+		oobregion->length = sas - chip->ecc.bytes - 6;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops brcmnand_bch_lp_ooblayout_ops = {
+	.ecc = brcmnand_bch_ooblayout_ecc,
+	.free = brcmnand_bch_ooblayout_free_lp,
+};
+
+static const struct mtd_ooblayout_ops brcmnand_bch_sp_ooblayout_ops = {
+	.ecc = brcmnand_bch_ooblayout_ecc,
+	.free = brcmnand_bch_ooblayout_free_sp,
+};
+
+static int brcmstb_choose_ecc_layout(struct brcmnand_host *host)
 {
-	struct nand_ecclayout *layout;
 	struct brcmnand_cfg *p = &host->hwcfg;
+	struct mtd_info *mtd = nand_to_mtd(&host->chip);
+	struct nand_ecc_ctrl *ecc = &host->chip.ecc;
 	unsigned int ecc_level = p->ecc_level;
+	int sas = p->spare_area_size << p->sector_size_1k;
+	int sectors = p->page_size / (512 << p->sector_size_1k);
 
 	if (p->sector_size_1k)
 		ecc_level <<= 1;
 
-	layout = brcmnand_create_layout(ecc_level, host);
-	if (!layout) {
+	if (is_hamming_ecc(p)) {
+		ecc->bytes = 3 * sectors;
+		mtd_set_ooblayout(mtd, &brcmnand_hamming_ooblayout_ops);
+		return 0;
+	}
+
+	/*
+	 * CONTROLLER_VERSION:
+	 *   < v5.0: ECC_REQ = ceil(BCH_T * 13/8)
+	 *  >= v5.0: ECC_REQ = ceil(BCH_T * 14/8)
+	 * But we will just be conservative.
+	 */
+	ecc->bytes = DIV_ROUND_UP(ecc_level * 14, 8);
+	if (p->page_size == 512)
+		mtd_set_ooblayout(mtd, &brcmnand_bch_sp_ooblayout_ops);
+	else
+		mtd_set_ooblayout(mtd, &brcmnand_bch_lp_ooblayout_ops);
+
+	if (ecc->bytes >= sas) {
 		dev_err(&host->pdev->dev,
-				"no proper ecc_layout for this NAND cfg\n");
-		return NULL;
+			"error: ECC too large for OOB (ECC bytes %d, spare sector %d)\n",
+			ecc->bytes, sas);
+		return -EINVAL;
 	}
 
-	return layout;
+	return 0;
 }
 
 static void brcmnand_wp(struct mtd_info *mtd, int wp)
@@ -2011,9 +2067,9 @@ static int brcmnand_init_cs(struct brcmnand_host *host, struct device_node *dn)
 	/* only use our internal HW threshold */
 	mtd->bitflip_threshold = 1;
 
-	chip->ecc.layout = brcmstb_choose_ecc_layout(host);
-	if (!chip->ecc.layout)
-		return -ENXIO;
+	ret = brcmstb_choose_ecc_layout(host);
+	if (ret)
+		return ret;
 
 	if (nand_scan_tail(mtd))
 		return -ENXIO;
-- 
2.5.0

[PATCH v5 24/50] mtd: nand: brcm: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/brcmnand/brcmnand.c | 258 +++++++++++++++++++++--------------
 1 file changed, 157 insertions(+), 101 deletions(-)

diff --git a/drivers/mtd/nand/brcmnand/brcmnand.c b/drivers/mtd/nand/brcmnand/brcmnand.c
index e052839..4c3c0a9 100644
--- a/drivers/mtd/nand/brcmnand/brcmnand.c
+++ b/drivers/mtd/nand/brcmnand/brcmnand.c
@@ -781,127 +781,183 @@ static inline bool is_hamming_ecc(struct brcmnand_cfg *cfg)
 }
 
 /*
- * Returns a nand_ecclayout strucutre for the given layout/configuration.
- * Returns NULL on failure.
+ * Set mtd->ooblayout to the appropriate mtd_ooblayout_ops given
+ * the layout/configuration.
+ * Returns -ERRCODE on failure.
  */
-static struct nand_ecclayout *brcmnand_create_layout(int ecc_level,
-						     struct brcmnand_host *host)
+static int brcmnand_hamming_ooblayout_ecc(struct mtd_info *mtd, int section,
+					  struct mtd_oob_region *oobregion)
 {
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct brcmnand_host *host = nand_get_controller_data(chip);
 	struct brcmnand_cfg *cfg = &host->hwcfg;
-	int i, j;
-	struct nand_ecclayout *layout;
-	int req;
-	int sectors;
-	int sas;
-	int idx1, idx2;
-
-	layout = devm_kzalloc(&host->pdev->dev, sizeof(*layout), GFP_KERNEL);
-	if (!layout)
-		return NULL;
-
-	sectors = cfg->page_size / (512 << cfg->sector_size_1k);
-	sas = cfg->spare_area_size << cfg->sector_size_1k;
-
-	/* Hamming */
-	if (is_hamming_ecc(cfg)) {
-		for (i = 0, idx1 = 0, idx2 = 0; i < sectors; i++) {
-			/* First sector of each page may have BBI */
-			if (i == 0) {
-				layout->oobfree[idx2].offset = i * sas + 1;
-				/* Small-page NAND use byte 6 for BBI */
-				if (cfg->page_size == 512)
-					layout->oobfree[idx2].offset--;
-				layout->oobfree[idx2].length = 5;
-			} else {
-				layout->oobfree[idx2].offset = i * sas;
-				layout->oobfree[idx2].length = 6;
-			}
-			idx2++;
-			layout->eccpos[idx1++] = i * sas + 6;
-			layout->eccpos[idx1++] = i * sas + 7;
-			layout->eccpos[idx1++] = i * sas + 8;
-			layout->oobfree[idx2].offset = i * sas + 9;
-			layout->oobfree[idx2].length = 7;
-			idx2++;
-			/* Leave zero-terminated entry for OOBFREE */
-			if (idx1 >= MTD_MAX_ECCPOS_ENTRIES_LARGE ||
-				    idx2 >= MTD_MAX_OOBFREE_ENTRIES_LARGE - 1)
-				break;
-		}
+	int sas = cfg->spare_area_size << cfg->sector_size_1k;
+	int sectors = cfg->page_size / (512 << cfg->sector_size_1k);
 
-		return layout;
-	}
+	if (section >= sectors)
+		return -ERANGE;
 
-	/*
-	 * CONTROLLER_VERSION:
-	 *   < v5.0: ECC_REQ = ceil(BCH_T * 13/8)
-	 *  >= v5.0: ECC_REQ = ceil(BCH_T * 14/8)
-	 * But we will just be conservative.
-	 */
-	req = DIV_ROUND_UP(ecc_level * 14, 8);
-	if (req >= sas) {
-		dev_err(&host->pdev->dev,
-			"error: ECC too large for OOB (ECC bytes %d, spare sector %d)\n",
-			req, sas);
-		return NULL;
-	}
+	oobregion->offset = (section * sas) + 6;
+	oobregion->length = 3;
+
+	return 0;
+}
+
+static int brcmnand_hamming_ooblayout_free(struct mtd_info *mtd, int section,
+					   struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct brcmnand_host *host = nand_get_controller_data(chip);
+	struct brcmnand_cfg *cfg = &host->hwcfg;
+	int sas = cfg->spare_area_size << cfg->sector_size_1k;
+	int sectors = cfg->page_size / (512 << cfg->sector_size_1k);
+
+	if (section >= sectors * 2)
+		return -ERANGE;
 
-	layout->eccbytes = req * sectors;
-	for (i = 0, idx1 = 0, idx2 = 0; i < sectors; i++) {
-		for (j = sas - req; j < sas && idx1 <
-				MTD_MAX_ECCPOS_ENTRIES_LARGE; j++, idx1++)
-			layout->eccpos[idx1] = i * sas + j;
+	oobregion->offset = (section / 2) * sas;
+
+	if (section & 1) {
+		oobregion->offset += 9;
+		oobregion->length = 7;
+	} else {
+		oobregion->length = 6;
 
 		/* First sector of each page may have BBI */
-		if (i == 0) {
-			if (cfg->page_size == 512 && (sas - req >= 6)) {
-				/* Small-page NAND use byte 6 for BBI */
-				layout->oobfree[idx2].offset = 0;
-				layout->oobfree[idx2].length = 5;
-				idx2++;
-				if (sas - req > 6) {
-					layout->oobfree[idx2].offset = 6;
-					layout->oobfree[idx2].length =
-						sas - req - 6;
-					idx2++;
-				}
-			} else if (sas > req + 1) {
-				layout->oobfree[idx2].offset = i * sas + 1;
-				layout->oobfree[idx2].length = sas - req - 1;
-				idx2++;
-			}
-		} else if (sas > req) {
-			layout->oobfree[idx2].offset = i * sas;
-			layout->oobfree[idx2].length = sas - req;
-			idx2++;
+		if (!section) {
+			/*
+			 * Small-page NAND use byte 6 for BBI while large-page
+			 * NAND use byte 0.
+			 */
+			if (cfg->page_size > 512)
+				oobregion->offset++;
+			oobregion->length--;
 		}
-		/* Leave zero-terminated entry for OOBFREE */
-		if (idx1 >= MTD_MAX_ECCPOS_ENTRIES_LARGE ||
-				idx2 >= MTD_MAX_OOBFREE_ENTRIES_LARGE - 1)
-			break;
 	}
 
-	return layout;
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops brcmnand_hamming_ooblayout_ops = {
+	.ecc = brcmnand_hamming_ooblayout_ecc,
+	.free = brcmnand_hamming_ooblayout_free,
+};
+
+static int brcmnand_bch_ooblayout_ecc(struct mtd_info *mtd, int section,
+				      struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct brcmnand_host *host = nand_get_controller_data(chip);
+	struct brcmnand_cfg *cfg = &host->hwcfg;
+	int sas = cfg->spare_area_size << cfg->sector_size_1k;
+	int sectors = cfg->page_size / (512 << cfg->sector_size_1k);
+
+	if (section >= sectors)
+		return -ERANGE;
+
+	oobregion->offset = (section * (sas + 1)) - chip->ecc.bytes;
+	oobregion->length = chip->ecc.bytes;
+
+	return 0;
 }
 
-static struct nand_ecclayout *brcmstb_choose_ecc_layout(
-		struct brcmnand_host *host)
+static int brcmnand_bch_ooblayout_free_lp(struct mtd_info *mtd, int section,
+					  struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct brcmnand_host *host = nand_get_controller_data(chip);
+	struct brcmnand_cfg *cfg = &host->hwcfg;
+	int sas = cfg->spare_area_size << cfg->sector_size_1k;
+	int sectors = cfg->page_size / (512 << cfg->sector_size_1k);
+
+	if (section >= sectors)
+		return -ERANGE;
+
+	if (sas <= chip->ecc.bytes)
+		return 0;
+
+	oobregion->offset = section * sas;
+	oobregion->length = sas - chip->ecc.bytes;
+
+	if (!section) {
+		oobregion->offset++;
+		oobregion->length--;
+	}
+
+	return 0;
+}
+
+static int brcmnand_bch_ooblayout_free_sp(struct mtd_info *mtd, int section,
+					  struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct brcmnand_host *host = nand_get_controller_data(chip);
+	struct brcmnand_cfg *cfg = &host->hwcfg;
+	int sas = cfg->spare_area_size << cfg->sector_size_1k;
+
+	if (section > 1 || sas - chip->ecc.bytes < 6 ||
+	    (section && sas - chip->ecc.bytes == 6))
+		return -ERANGE;
+
+	if (!section) {
+		oobregion->offset = 0;
+		oobregion->length = 5;
+	} else {
+		oobregion->offset = 6;
+		oobregion->length = sas - chip->ecc.bytes - 6;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops brcmnand_bch_lp_ooblayout_ops = {
+	.ecc = brcmnand_bch_ooblayout_ecc,
+	.free = brcmnand_bch_ooblayout_free_lp,
+};
+
+static const struct mtd_ooblayout_ops brcmnand_bch_sp_ooblayout_ops = {
+	.ecc = brcmnand_bch_ooblayout_ecc,
+	.free = brcmnand_bch_ooblayout_free_sp,
+};
+
+static int brcmstb_choose_ecc_layout(struct brcmnand_host *host)
 {
-	struct nand_ecclayout *layout;
 	struct brcmnand_cfg *p = &host->hwcfg;
+	struct mtd_info *mtd = nand_to_mtd(&host->chip);
+	struct nand_ecc_ctrl *ecc = &host->chip.ecc;
 	unsigned int ecc_level = p->ecc_level;
+	int sas = p->spare_area_size << p->sector_size_1k;
+	int sectors = p->page_size / (512 << p->sector_size_1k);
 
 	if (p->sector_size_1k)
 		ecc_level <<= 1;
 
-	layout = brcmnand_create_layout(ecc_level, host);
-	if (!layout) {
+	if (is_hamming_ecc(p)) {
+		ecc->bytes = 3 * sectors;
+		mtd_set_ooblayout(mtd, &brcmnand_hamming_ooblayout_ops);
+		return 0;
+	}
+
+	/*
+	 * CONTROLLER_VERSION:
+	 *   < v5.0: ECC_REQ = ceil(BCH_T * 13/8)
+	 *  >= v5.0: ECC_REQ = ceil(BCH_T * 14/8)
+	 * But we will just be conservative.
+	 */
+	ecc->bytes = DIV_ROUND_UP(ecc_level * 14, 8);
+	if (p->page_size == 512)
+		mtd_set_ooblayout(mtd, &brcmnand_bch_sp_ooblayout_ops);
+	else
+		mtd_set_ooblayout(mtd, &brcmnand_bch_lp_ooblayout_ops);
+
+	if (ecc->bytes >= sas) {
 		dev_err(&host->pdev->dev,
-				"no proper ecc_layout for this NAND cfg\n");
-		return NULL;
+			"error: ECC too large for OOB (ECC bytes %d, spare sector %d)\n",
+			ecc->bytes, sas);
+		return -EINVAL;
 	}
 
-	return layout;
+	return 0;
 }
 
 static void brcmnand_wp(struct mtd_info *mtd, int wp)
@@ -2011,9 +2067,9 @@ static int brcmnand_init_cs(struct brcmnand_host *host, struct device_node *dn)
 	/* only use our internal HW threshold */
 	mtd->bitflip_threshold = 1;
 
-	chip->ecc.layout = brcmstb_choose_ecc_layout(host);
-	if (!chip->ecc.layout)
-		return -ENXIO;
+	ret = brcmstb_choose_ecc_layout(host);
+	if (ret)
+		return ret;
 
 	if (nand_scan_tail(mtd))
 		return -ENXIO;
-- 
2.5.0

[PATCH v5 25/50] mtd: nand: cafe: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/cafe_nand.c | 44 ++++++++++++++++++++++++++++++++------------
 1 file changed, 32 insertions(+), 12 deletions(-)

diff --git a/drivers/mtd/nand/cafe_nand.c b/drivers/mtd/nand/cafe_nand.c
index e553aff..0b0c937 100644
--- a/drivers/mtd/nand/cafe_nand.c
+++ b/drivers/mtd/nand/cafe_nand.c
@@ -459,10 +459,37 @@ static int cafe_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
 	return max_bitflips;
 }
 
-static struct nand_ecclayout cafe_oobinfo_2048 = {
-	.eccbytes = 14,
-	.eccpos = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13},
-	.oobfree = {{14, 50}}
+static int cafe_ooblayout_ecc(struct mtd_info *mtd, int section,
+			      struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 0;
+	oobregion->length = chip->ecc.total;
+
+	return 0;
+}
+
+static int cafe_ooblayout_free(struct mtd_info *mtd, int section,
+			       struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = chip->ecc.total;
+	oobregion->length = mtd->oobsize - chip->ecc.total;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops cafe_ooblayout_ops = {
+	.ecc = cafe_ooblayout_ecc,
+	.free = cafe_ooblayout_free,
 };
 
 /* Ick. The BBT code really ought to be able to work this bit out
@@ -494,12 +521,6 @@ static struct nand_bbt_descr cafe_bbt_mirror_descr_2048 = {
 	.pattern = cafe_mirror_pattern_2048
 };
 
-static struct nand_ecclayout cafe_oobinfo_512 = {
-	.eccbytes = 14,
-	.eccpos = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13},
-	.oobfree = {{14, 2}}
-};
-
 static struct nand_bbt_descr cafe_bbt_main_descr_512 = {
 	.options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
 		| NAND_BBT_2BIT | NAND_BBT_VERSION,
@@ -743,12 +764,11 @@ static int cafe_nand_probe(struct pci_dev *pdev,
 		cafe->ctl2 |= 1<<29; /* 2KiB page size */
 
 	/* Set up ECC according to the type of chip we found */
+	mtd_set_ooblayout(mtd, &cafe_ooblayout_ops);
 	if (mtd->writesize == 2048) {
-		cafe->nand.ecc.layout = &cafe_oobinfo_2048;
 		cafe->nand.bbt_td = &cafe_bbt_main_descr_2048;
 		cafe->nand.bbt_md = &cafe_bbt_mirror_descr_2048;
 	} else if (mtd->writesize == 512) {
-		cafe->nand.ecc.layout = &cafe_oobinfo_512;
 		cafe->nand.bbt_td = &cafe_bbt_main_descr_512;
 		cafe->nand.bbt_md = &cafe_bbt_mirror_descr_512;
 	} else {
-- 
2.5.0

[PATCH v5 25/50] mtd: nand: cafe: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/mtd/nand/cafe_nand.c | 44 ++++++++++++++++++++++++++++++++------------
 1 file changed, 32 insertions(+), 12 deletions(-)

diff --git a/drivers/mtd/nand/cafe_nand.c b/drivers/mtd/nand/cafe_nand.c
index e553aff..0b0c937 100644
--- a/drivers/mtd/nand/cafe_nand.c
+++ b/drivers/mtd/nand/cafe_nand.c
@@ -459,10 +459,37 @@ static int cafe_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
 	return max_bitflips;
 }
 
-static struct nand_ecclayout cafe_oobinfo_2048 = {
-	.eccbytes = 14,
-	.eccpos = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13},
-	.oobfree = {{14, 50}}
+static int cafe_ooblayout_ecc(struct mtd_info *mtd, int section,
+			      struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 0;
+	oobregion->length = chip->ecc.total;
+
+	return 0;
+}
+
+static int cafe_ooblayout_free(struct mtd_info *mtd, int section,
+			       struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = chip->ecc.total;
+	oobregion->length = mtd->oobsize - chip->ecc.total;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops cafe_ooblayout_ops = {
+	.ecc = cafe_ooblayout_ecc,
+	.free = cafe_ooblayout_free,
 };
 
 /* Ick. The BBT code really ought to be able to work this bit out
@@ -494,12 +521,6 @@ static struct nand_bbt_descr cafe_bbt_mirror_descr_2048 = {
 	.pattern = cafe_mirror_pattern_2048
 };
 
-static struct nand_ecclayout cafe_oobinfo_512 = {
-	.eccbytes = 14,
-	.eccpos = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13},
-	.oobfree = {{14, 2}}
-};
-
 static struct nand_bbt_descr cafe_bbt_main_descr_512 = {
 	.options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
 		| NAND_BBT_2BIT | NAND_BBT_VERSION,
@@ -743,12 +764,11 @@ static int cafe_nand_probe(struct pci_dev *pdev,
 		cafe->ctl2 |= 1<<29; /* 2KiB page size */
 
 	/* Set up ECC according to the type of chip we found */
+	mtd_set_ooblayout(mtd, &cafe_ooblayout_ops);
 	if (mtd->writesize == 2048) {
-		cafe->nand.ecc.layout = &cafe_oobinfo_2048;
 		cafe->nand.bbt_td = &cafe_bbt_main_descr_2048;
 		cafe->nand.bbt_md = &cafe_bbt_mirror_descr_2048;
 	} else if (mtd->writesize == 512) {
-		cafe->nand.ecc.layout = &cafe_oobinfo_512;
 		cafe->nand.bbt_td = &cafe_bbt_main_descr_512;
 		cafe->nand.bbt_md = &cafe_bbt_mirror_descr_512;
 	} else {
-- 
2.5.0

[PATCH v5 25/50] mtd: nand: cafe: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/cafe_nand.c | 44 ++++++++++++++++++++++++++++++++------------
 1 file changed, 32 insertions(+), 12 deletions(-)

diff --git a/drivers/mtd/nand/cafe_nand.c b/drivers/mtd/nand/cafe_nand.c
index e553aff..0b0c937 100644
--- a/drivers/mtd/nand/cafe_nand.c
+++ b/drivers/mtd/nand/cafe_nand.c
@@ -459,10 +459,37 @@ static int cafe_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
 	return max_bitflips;
 }
 
-static struct nand_ecclayout cafe_oobinfo_2048 = {
-	.eccbytes = 14,
-	.eccpos = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13},
-	.oobfree = {{14, 50}}
+static int cafe_ooblayout_ecc(struct mtd_info *mtd, int section,
+			      struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 0;
+	oobregion->length = chip->ecc.total;
+
+	return 0;
+}
+
+static int cafe_ooblayout_free(struct mtd_info *mtd, int section,
+			       struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = chip->ecc.total;
+	oobregion->length = mtd->oobsize - chip->ecc.total;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops cafe_ooblayout_ops = {
+	.ecc = cafe_ooblayout_ecc,
+	.free = cafe_ooblayout_free,
 };
 
 /* Ick. The BBT code really ought to be able to work this bit out
@@ -494,12 +521,6 @@ static struct nand_bbt_descr cafe_bbt_mirror_descr_2048 = {
 	.pattern = cafe_mirror_pattern_2048
 };
 
-static struct nand_ecclayout cafe_oobinfo_512 = {
-	.eccbytes = 14,
-	.eccpos = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13},
-	.oobfree = {{14, 2}}
-};
-
 static struct nand_bbt_descr cafe_bbt_main_descr_512 = {
 	.options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
 		| NAND_BBT_2BIT | NAND_BBT_VERSION,
@@ -743,12 +764,11 @@ static int cafe_nand_probe(struct pci_dev *pdev,
 		cafe->ctl2 |= 1<<29; /* 2KiB page size */
 
 	/* Set up ECC according to the type of chip we found */
+	mtd_set_ooblayout(mtd, &cafe_ooblayout_ops);
 	if (mtd->writesize == 2048) {
-		cafe->nand.ecc.layout = &cafe_oobinfo_2048;
 		cafe->nand.bbt_td = &cafe_bbt_main_descr_2048;
 		cafe->nand.bbt_md = &cafe_bbt_mirror_descr_2048;
 	} else if (mtd->writesize == 512) {
-		cafe->nand.ecc.layout = &cafe_oobinfo_512;
 		cafe->nand.bbt_td = &cafe_bbt_main_descr_512;
 		cafe->nand.bbt_md = &cafe_bbt_mirror_descr_512;
 	} else {
-- 
2.5.0

[PATCH v5 26/50] mtd: nand: davinci: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/davinci_nand.c | 118 +++++++++++++++-------------------------
 1 file changed, 44 insertions(+), 74 deletions(-)

diff --git a/drivers/mtd/nand/davinci_nand.c b/drivers/mtd/nand/davinci_nand.c
index 8cb821b..fe3fd29 100644
--- a/drivers/mtd/nand/davinci_nand.c
+++ b/drivers/mtd/nand/davinci_nand.c
@@ -54,7 +54,6 @@
  */
 struct davinci_nand_info {
 	struct nand_chip	chip;
-	struct nand_ecclayout	ecclayout;
 
 	struct device		*dev;
 	struct clk		*clk;
@@ -480,63 +479,46 @@ static int nand_davinci_dev_ready(struct mtd_info *mtd)
  * ten ECC bytes plus the manufacturer's bad block marker byte, and
  * and not overlapping the default BBT markers.
  */
-static struct nand_ecclayout hwecc4_small = {
-	.eccbytes = 10,
-	.eccpos = { 0, 1, 2, 3, 4,
-		/* offset 5 holds the badblock marker */
-		6, 7,
-		13, 14, 15, },
-	.oobfree = {
-		{.offset = 8, .length = 5, },
-		{.offset = 16, },
-	},
-};
+static int hwecc4_ooblayout_small_ecc(struct mtd_info *mtd, int section,
+				      struct mtd_oob_region *oobregion)
+{
+	if (section > 2)
+		return -ERANGE;
+
+	if (!section) {
+		oobregion->offset = 0;
+		oobregion->length = 5;
+	} else if (section == 1) {
+		oobregion->offset = 6;
+		oobregion->length = 2;
+	} else {
+		oobregion->offset = 13;
+		oobregion->length = 3;
+	}
 
-/* An ECC layout for using 4-bit ECC with large-page (2048bytes) flash,
- * storing ten ECC bytes plus the manufacturer's bad block marker byte,
- * and not overlapping the default BBT markers.
- */
-static struct nand_ecclayout hwecc4_2048 = {
-	.eccbytes = 40,
-	.eccpos = {
-		/* at the end of spare sector */
-		24, 25, 26, 27, 28, 29,	30, 31, 32, 33,
-		34, 35, 36, 37, 38, 39,	40, 41, 42, 43,
-		44, 45, 46, 47, 48, 49, 50, 51, 52, 53,
-		54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
-		},
-	.oobfree = {
-		/* 2 bytes at offset 0 hold manufacturer badblock markers */
-		{.offset = 2, .length = 22, },
-		/* 5 bytes at offset 8 hold BBT markers */
-		/* 8 bytes at offset 16 hold JFFS2 clean markers */
-	},
-};
+	return 0;
+}
 
-/*
- * An ECC layout for using 4-bit ECC with large-page (4096bytes) flash,
- * storing ten ECC bytes plus the manufacturer's bad block marker byte,
- * and not overlapping the default BBT markers.
- */
-static struct nand_ecclayout hwecc4_4096 = {
-	.eccbytes = 80,
-	.eccpos = {
-		/* at the end of spare sector */
-		48, 49, 50, 51, 52, 53, 54, 55, 56, 57,
-		58, 59, 60, 61, 62, 63, 64, 65, 66, 67,
-		68, 69, 70, 71, 72, 73, 74, 75, 76, 77,
-		78, 79, 80, 81, 82, 83, 84, 85, 86, 87,
-		88, 89, 90, 91, 92, 93, 94, 95, 96, 97,
-		98, 99, 100, 101, 102, 103, 104, 105, 106, 107,
-		108, 109, 110, 111, 112, 113, 114, 115, 116, 117,
-		118, 119, 120, 121, 122, 123, 124, 125, 126, 127,
-	},
-	.oobfree = {
-		/* 2 bytes at offset 0 hold manufacturer badblock markers */
-		{.offset = 2, .length = 46, },
-		/* 5 bytes at offset 8 hold BBT markers */
-		/* 8 bytes at offset 16 hold JFFS2 clean markers */
-	},
+static int hwecc4_ooblayout_small_free(struct mtd_info *mtd, int section,
+				       struct mtd_oob_region *oobregion)
+{
+	if (section > 1)
+		return -ERANGE;
+
+	if (!section) {
+		oobregion->offset = 8;
+		oobregion->length = 5;
+	} else {
+		oobregion->offset = 16;
+		oobregion->length = mtd->oobsize - 16;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops hwecc4_small_ooblayout_ops = {
+	.ecc = hwecc4_ooblayout_small_ecc,
+	.free = hwecc4_ooblayout_small_free,
 };
 
 #if defined(CONFIG_OF)
@@ -805,26 +787,14 @@ static int nand_davinci_probe(struct platform_device *pdev)
 		 * table marker fits in the free bytes.
 		 */
 		if (chunks == 1) {
-			info->ecclayout = hwecc4_small;
-			info->ecclayout.oobfree[1].length = mtd->oobsize - 16;
-			goto syndrome_done;
-		}
-		if (chunks == 4) {
-			info->ecclayout = hwecc4_2048;
+			mtd_set_ooblayout(mtd, &hwecc4_small_ooblayout_ops);
+		} else if (chunks == 4 || chunks == 8) {
+			mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
 			info->chip.ecc.mode = NAND_ECC_HW_OOB_FIRST;
-			goto syndrome_done;
-		}
-		if (chunks == 8) {
-			info->ecclayout = hwecc4_4096;
-			info->chip.ecc.mode = NAND_ECC_HW_OOB_FIRST;
-			goto syndrome_done;
+		} else {
+			ret = -EIO;
+			goto err;
 		}
-
-		ret = -EIO;
-		goto err;
-
-syndrome_done:
-		info->chip.ecc.layout = &info->ecclayout;
 	}
 
 	ret = nand_scan_tail(mtd);
-- 
2.5.0

[PATCH v5 26/50] mtd: nand: davinci: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/mtd/nand/davinci_nand.c | 118 +++++++++++++++-------------------------
 1 file changed, 44 insertions(+), 74 deletions(-)

diff --git a/drivers/mtd/nand/davinci_nand.c b/drivers/mtd/nand/davinci_nand.c
index 8cb821b..fe3fd29 100644
--- a/drivers/mtd/nand/davinci_nand.c
+++ b/drivers/mtd/nand/davinci_nand.c
@@ -54,7 +54,6 @@
  */
 struct davinci_nand_info {
 	struct nand_chip	chip;
-	struct nand_ecclayout	ecclayout;
 
 	struct device		*dev;
 	struct clk		*clk;
@@ -480,63 +479,46 @@ static int nand_davinci_dev_ready(struct mtd_info *mtd)
  * ten ECC bytes plus the manufacturer's bad block marker byte, and
  * and not overlapping the default BBT markers.
  */
-static struct nand_ecclayout hwecc4_small = {
-	.eccbytes = 10,
-	.eccpos = { 0, 1, 2, 3, 4,
-		/* offset 5 holds the badblock marker */
-		6, 7,
-		13, 14, 15, },
-	.oobfree = {
-		{.offset = 8, .length = 5, },
-		{.offset = 16, },
-	},
-};
+static int hwecc4_ooblayout_small_ecc(struct mtd_info *mtd, int section,
+				      struct mtd_oob_region *oobregion)
+{
+	if (section > 2)
+		return -ERANGE;
+
+	if (!section) {
+		oobregion->offset = 0;
+		oobregion->length = 5;
+	} else if (section == 1) {
+		oobregion->offset = 6;
+		oobregion->length = 2;
+	} else {
+		oobregion->offset = 13;
+		oobregion->length = 3;
+	}
 
-/* An ECC layout for using 4-bit ECC with large-page (2048bytes) flash,
- * storing ten ECC bytes plus the manufacturer's bad block marker byte,
- * and not overlapping the default BBT markers.
- */
-static struct nand_ecclayout hwecc4_2048 = {
-	.eccbytes = 40,
-	.eccpos = {
-		/* at the end of spare sector */
-		24, 25, 26, 27, 28, 29,	30, 31, 32, 33,
-		34, 35, 36, 37, 38, 39,	40, 41, 42, 43,
-		44, 45, 46, 47, 48, 49, 50, 51, 52, 53,
-		54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
-		},
-	.oobfree = {
-		/* 2 bytes at offset 0 hold manufacturer badblock markers */
-		{.offset = 2, .length = 22, },
-		/* 5 bytes at offset 8 hold BBT markers */
-		/* 8 bytes at offset 16 hold JFFS2 clean markers */
-	},
-};
+	return 0;
+}
 
-/*
- * An ECC layout for using 4-bit ECC with large-page (4096bytes) flash,
- * storing ten ECC bytes plus the manufacturer's bad block marker byte,
- * and not overlapping the default BBT markers.
- */
-static struct nand_ecclayout hwecc4_4096 = {
-	.eccbytes = 80,
-	.eccpos = {
-		/* at the end of spare sector */
-		48, 49, 50, 51, 52, 53, 54, 55, 56, 57,
-		58, 59, 60, 61, 62, 63, 64, 65, 66, 67,
-		68, 69, 70, 71, 72, 73, 74, 75, 76, 77,
-		78, 79, 80, 81, 82, 83, 84, 85, 86, 87,
-		88, 89, 90, 91, 92, 93, 94, 95, 96, 97,
-		98, 99, 100, 101, 102, 103, 104, 105, 106, 107,
-		108, 109, 110, 111, 112, 113, 114, 115, 116, 117,
-		118, 119, 120, 121, 122, 123, 124, 125, 126, 127,
-	},
-	.oobfree = {
-		/* 2 bytes at offset 0 hold manufacturer badblock markers */
-		{.offset = 2, .length = 46, },
-		/* 5 bytes at offset 8 hold BBT markers */
-		/* 8 bytes at offset 16 hold JFFS2 clean markers */
-	},
+static int hwecc4_ooblayout_small_free(struct mtd_info *mtd, int section,
+				       struct mtd_oob_region *oobregion)
+{
+	if (section > 1)
+		return -ERANGE;
+
+	if (!section) {
+		oobregion->offset = 8;
+		oobregion->length = 5;
+	} else {
+		oobregion->offset = 16;
+		oobregion->length = mtd->oobsize - 16;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops hwecc4_small_ooblayout_ops = {
+	.ecc = hwecc4_ooblayout_small_ecc,
+	.free = hwecc4_ooblayout_small_free,
 };
 
 #if defined(CONFIG_OF)
@@ -805,26 +787,14 @@ static int nand_davinci_probe(struct platform_device *pdev)
 		 * table marker fits in the free bytes.
 		 */
 		if (chunks == 1) {
-			info->ecclayout = hwecc4_small;
-			info->ecclayout.oobfree[1].length = mtd->oobsize - 16;
-			goto syndrome_done;
-		}
-		if (chunks == 4) {
-			info->ecclayout = hwecc4_2048;
+			mtd_set_ooblayout(mtd, &hwecc4_small_ooblayout_ops);
+		} else if (chunks == 4 || chunks == 8) {
+			mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
 			info->chip.ecc.mode = NAND_ECC_HW_OOB_FIRST;
-			goto syndrome_done;
-		}
-		if (chunks == 8) {
-			info->ecclayout = hwecc4_4096;
-			info->chip.ecc.mode = NAND_ECC_HW_OOB_FIRST;
-			goto syndrome_done;
+		} else {
+			ret = -EIO;
+			goto err;
 		}
-
-		ret = -EIO;
-		goto err;
-
-syndrome_done:
-		info->chip.ecc.layout = &info->ecclayout;
 	}
 
 	ret = nand_scan_tail(mtd);
-- 
2.5.0

[PATCH v5 26/50] mtd: nand: davinci: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/davinci_nand.c | 118 +++++++++++++++-------------------------
 1 file changed, 44 insertions(+), 74 deletions(-)

diff --git a/drivers/mtd/nand/davinci_nand.c b/drivers/mtd/nand/davinci_nand.c
index 8cb821b..fe3fd29 100644
--- a/drivers/mtd/nand/davinci_nand.c
+++ b/drivers/mtd/nand/davinci_nand.c
@@ -54,7 +54,6 @@
  */
 struct davinci_nand_info {
 	struct nand_chip	chip;
-	struct nand_ecclayout	ecclayout;
 
 	struct device		*dev;
 	struct clk		*clk;
@@ -480,63 +479,46 @@ static int nand_davinci_dev_ready(struct mtd_info *mtd)
  * ten ECC bytes plus the manufacturer's bad block marker byte, and
  * and not overlapping the default BBT markers.
  */
-static struct nand_ecclayout hwecc4_small = {
-	.eccbytes = 10,
-	.eccpos = { 0, 1, 2, 3, 4,
-		/* offset 5 holds the badblock marker */
-		6, 7,
-		13, 14, 15, },
-	.oobfree = {
-		{.offset = 8, .length = 5, },
-		{.offset = 16, },
-	},
-};
+static int hwecc4_ooblayout_small_ecc(struct mtd_info *mtd, int section,
+				      struct mtd_oob_region *oobregion)
+{
+	if (section > 2)
+		return -ERANGE;
+
+	if (!section) {
+		oobregion->offset = 0;
+		oobregion->length = 5;
+	} else if (section == 1) {
+		oobregion->offset = 6;
+		oobregion->length = 2;
+	} else {
+		oobregion->offset = 13;
+		oobregion->length = 3;
+	}
 
-/* An ECC layout for using 4-bit ECC with large-page (2048bytes) flash,
- * storing ten ECC bytes plus the manufacturer's bad block marker byte,
- * and not overlapping the default BBT markers.
- */
-static struct nand_ecclayout hwecc4_2048 = {
-	.eccbytes = 40,
-	.eccpos = {
-		/* at the end of spare sector */
-		24, 25, 26, 27, 28, 29,	30, 31, 32, 33,
-		34, 35, 36, 37, 38, 39,	40, 41, 42, 43,
-		44, 45, 46, 47, 48, 49, 50, 51, 52, 53,
-		54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
-		},
-	.oobfree = {
-		/* 2 bytes at offset 0 hold manufacturer badblock markers */
-		{.offset = 2, .length = 22, },
-		/* 5 bytes at offset 8 hold BBT markers */
-		/* 8 bytes at offset 16 hold JFFS2 clean markers */
-	},
-};
+	return 0;
+}
 
-/*
- * An ECC layout for using 4-bit ECC with large-page (4096bytes) flash,
- * storing ten ECC bytes plus the manufacturer's bad block marker byte,
- * and not overlapping the default BBT markers.
- */
-static struct nand_ecclayout hwecc4_4096 = {
-	.eccbytes = 80,
-	.eccpos = {
-		/* at the end of spare sector */
-		48, 49, 50, 51, 52, 53, 54, 55, 56, 57,
-		58, 59, 60, 61, 62, 63, 64, 65, 66, 67,
-		68, 69, 70, 71, 72, 73, 74, 75, 76, 77,
-		78, 79, 80, 81, 82, 83, 84, 85, 86, 87,
-		88, 89, 90, 91, 92, 93, 94, 95, 96, 97,
-		98, 99, 100, 101, 102, 103, 104, 105, 106, 107,
-		108, 109, 110, 111, 112, 113, 114, 115, 116, 117,
-		118, 119, 120, 121, 122, 123, 124, 125, 126, 127,
-	},
-	.oobfree = {
-		/* 2 bytes at offset 0 hold manufacturer badblock markers */
-		{.offset = 2, .length = 46, },
-		/* 5 bytes at offset 8 hold BBT markers */
-		/* 8 bytes at offset 16 hold JFFS2 clean markers */
-	},
+static int hwecc4_ooblayout_small_free(struct mtd_info *mtd, int section,
+				       struct mtd_oob_region *oobregion)
+{
+	if (section > 1)
+		return -ERANGE;
+
+	if (!section) {
+		oobregion->offset = 8;
+		oobregion->length = 5;
+	} else {
+		oobregion->offset = 16;
+		oobregion->length = mtd->oobsize - 16;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops hwecc4_small_ooblayout_ops = {
+	.ecc = hwecc4_ooblayout_small_ecc,
+	.free = hwecc4_ooblayout_small_free,
 };
 
 #if defined(CONFIG_OF)
@@ -805,26 +787,14 @@ static int nand_davinci_probe(struct platform_device *pdev)
 		 * table marker fits in the free bytes.
 		 */
 		if (chunks == 1) {
-			info->ecclayout = hwecc4_small;
-			info->ecclayout.oobfree[1].length = mtd->oobsize - 16;
-			goto syndrome_done;
-		}
-		if (chunks == 4) {
-			info->ecclayout = hwecc4_2048;
+			mtd_set_ooblayout(mtd, &hwecc4_small_ooblayout_ops);
+		} else if (chunks == 4 || chunks == 8) {
+			mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
 			info->chip.ecc.mode = NAND_ECC_HW_OOB_FIRST;
-			goto syndrome_done;
-		}
-		if (chunks == 8) {
-			info->ecclayout = hwecc4_4096;
-			info->chip.ecc.mode = NAND_ECC_HW_OOB_FIRST;
-			goto syndrome_done;
+		} else {
+			ret = -EIO;
+			goto err;
 		}
-
-		ret = -EIO;
-		goto err;
-
-syndrome_done:
-		info->chip.ecc.layout = &info->ecclayout;
 	}
 
 	ret = nand_scan_tail(mtd);
-- 
2.5.0

[PATCH v5 27/50] mtd: nand: denali: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/denali.c | 50 +++++++++++++++++++++++++++++++++--------------
 1 file changed, 35 insertions(+), 15 deletions(-)

diff --git a/drivers/mtd/nand/denali.c b/drivers/mtd/nand/denali.c
index 30bf5f6..0476ae8 100644
--- a/drivers/mtd/nand/denali.c
+++ b/drivers/mtd/nand/denali.c
@@ -1374,13 +1374,41 @@ static void denali_hw_init(struct denali_nand_info *denali)
  * correction
  */
 #define ECC_8BITS	14
-static struct nand_ecclayout nand_8bit_oob = {
-	.eccbytes = 14,
-};
-
 #define ECC_15BITS	26
-static struct nand_ecclayout nand_15bit_oob = {
-	.eccbytes = 26,
+
+static int denali_ooblayout_ecc(struct mtd_info *mtd, int section,
+				struct mtd_oob_region *oobregion)
+{
+	struct denali_nand_info *denali = mtd_to_denali(mtd);
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = denali->bbtskipbytes;
+	oobregion->length = chip->ecc.total;
+
+	return 0;
+}
+
+static int denali_ooblayout_free(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	struct denali_nand_info *denali = mtd_to_denali(mtd);
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = chip->ecc.total + denali->bbtskipbytes;
+	oobregion->length = mtd->oobsize - oobregion->offset;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops denali_ooblayout_ops = {
+	.ecc = denali_ooblayout_ecc,
+	.free = denali_ooblayout_free,
 };
 
 static uint8_t bbt_pattern[] = {'B', 'b', 't', '0' };
@@ -1561,7 +1589,6 @@ int denali_init(struct denali_nand_info *denali)
 			ECC_SECTOR_SIZE)))) {
 		/* if MLC OOB size is large enough, use 15bit ECC*/
 		denali->nand.ecc.strength = 15;
-		denali->nand.ecc.layout = &nand_15bit_oob;
 		denali->nand.ecc.bytes = ECC_15BITS;
 		iowrite32(15, denali->flash_reg + ECC_CORRECTION);
 	} else if (mtd->oobsize < (denali->bbtskipbytes +
@@ -1571,20 +1598,13 @@ int denali_init(struct denali_nand_info *denali)
 		goto failed_req_irq;
 	} else {
 		denali->nand.ecc.strength = 8;
-		denali->nand.ecc.layout = &nand_8bit_oob;
 		denali->nand.ecc.bytes = ECC_8BITS;
 		iowrite32(8, denali->flash_reg + ECC_CORRECTION);
 	}
 
+	mtd_set_ooblayout(mtd, &denali_ooblayout_ops);
 	denali->nand.ecc.bytes *= denali->devnum;
 	denali->nand.ecc.strength *= denali->devnum;
-	denali->nand.ecc.layout->eccbytes *=
-		mtd->writesize / ECC_SECTOR_SIZE;
-	denali->nand.ecc.layout->oobfree[0].offset =
-		denali->bbtskipbytes + denali->nand.ecc.layout->eccbytes;
-	denali->nand.ecc.layout->oobfree[0].length =
-		mtd->oobsize - denali->nand.ecc.layout->eccbytes -
-		denali->bbtskipbytes;
 
 	/*
 	 * Let driver know the total blocks number and how many blocks
-- 
2.5.0

[PATCH v5 27/50] mtd: nand: denali: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/mtd/nand/denali.c | 50 +++++++++++++++++++++++++++++++++--------------
 1 file changed, 35 insertions(+), 15 deletions(-)

diff --git a/drivers/mtd/nand/denali.c b/drivers/mtd/nand/denali.c
index 30bf5f6..0476ae8 100644
--- a/drivers/mtd/nand/denali.c
+++ b/drivers/mtd/nand/denali.c
@@ -1374,13 +1374,41 @@ static void denali_hw_init(struct denali_nand_info *denali)
  * correction
  */
 #define ECC_8BITS	14
-static struct nand_ecclayout nand_8bit_oob = {
-	.eccbytes = 14,
-};
-
 #define ECC_15BITS	26
-static struct nand_ecclayout nand_15bit_oob = {
-	.eccbytes = 26,
+
+static int denali_ooblayout_ecc(struct mtd_info *mtd, int section,
+				struct mtd_oob_region *oobregion)
+{
+	struct denali_nand_info *denali = mtd_to_denali(mtd);
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = denali->bbtskipbytes;
+	oobregion->length = chip->ecc.total;
+
+	return 0;
+}
+
+static int denali_ooblayout_free(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	struct denali_nand_info *denali = mtd_to_denali(mtd);
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = chip->ecc.total + denali->bbtskipbytes;
+	oobregion->length = mtd->oobsize - oobregion->offset;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops denali_ooblayout_ops = {
+	.ecc = denali_ooblayout_ecc,
+	.free = denali_ooblayout_free,
 };
 
 static uint8_t bbt_pattern[] = {'B', 'b', 't', '0' };
@@ -1561,7 +1589,6 @@ int denali_init(struct denali_nand_info *denali)
 			ECC_SECTOR_SIZE)))) {
 		/* if MLC OOB size is large enough, use 15bit ECC*/
 		denali->nand.ecc.strength = 15;
-		denali->nand.ecc.layout = &nand_15bit_oob;
 		denali->nand.ecc.bytes = ECC_15BITS;
 		iowrite32(15, denali->flash_reg + ECC_CORRECTION);
 	} else if (mtd->oobsize < (denali->bbtskipbytes +
@@ -1571,20 +1598,13 @@ int denali_init(struct denali_nand_info *denali)
 		goto failed_req_irq;
 	} else {
 		denali->nand.ecc.strength = 8;
-		denali->nand.ecc.layout = &nand_8bit_oob;
 		denali->nand.ecc.bytes = ECC_8BITS;
 		iowrite32(8, denali->flash_reg + ECC_CORRECTION);
 	}
 
+	mtd_set_ooblayout(mtd, &denali_ooblayout_ops);
 	denali->nand.ecc.bytes *= denali->devnum;
 	denali->nand.ecc.strength *= denali->devnum;
-	denali->nand.ecc.layout->eccbytes *=
-		mtd->writesize / ECC_SECTOR_SIZE;
-	denali->nand.ecc.layout->oobfree[0].offset =
-		denali->bbtskipbytes + denali->nand.ecc.layout->eccbytes;
-	denali->nand.ecc.layout->oobfree[0].length =
-		mtd->oobsize - denali->nand.ecc.layout->eccbytes -
-		denali->bbtskipbytes;
 
 	/*
 	 * Let driver know the total blocks number and how many blocks
-- 
2.5.0

[PATCH v5 27/50] mtd: nand: denali: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/denali.c | 50 +++++++++++++++++++++++++++++++++--------------
 1 file changed, 35 insertions(+), 15 deletions(-)

diff --git a/drivers/mtd/nand/denali.c b/drivers/mtd/nand/denali.c
index 30bf5f6..0476ae8 100644
--- a/drivers/mtd/nand/denali.c
+++ b/drivers/mtd/nand/denali.c
@@ -1374,13 +1374,41 @@ static void denali_hw_init(struct denali_nand_info *denali)
  * correction
  */
 #define ECC_8BITS	14
-static struct nand_ecclayout nand_8bit_oob = {
-	.eccbytes = 14,
-};
-
 #define ECC_15BITS	26
-static struct nand_ecclayout nand_15bit_oob = {
-	.eccbytes = 26,
+
+static int denali_ooblayout_ecc(struct mtd_info *mtd, int section,
+				struct mtd_oob_region *oobregion)
+{
+	struct denali_nand_info *denali = mtd_to_denali(mtd);
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = denali->bbtskipbytes;
+	oobregion->length = chip->ecc.total;
+
+	return 0;
+}
+
+static int denali_ooblayout_free(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	struct denali_nand_info *denali = mtd_to_denali(mtd);
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = chip->ecc.total + denali->bbtskipbytes;
+	oobregion->length = mtd->oobsize - oobregion->offset;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops denali_ooblayout_ops = {
+	.ecc = denali_ooblayout_ecc,
+	.free = denali_ooblayout_free,
 };
 
 static uint8_t bbt_pattern[] = {'B', 'b', 't', '0' };
@@ -1561,7 +1589,6 @@ int denali_init(struct denali_nand_info *denali)
 			ECC_SECTOR_SIZE)))) {
 		/* if MLC OOB size is large enough, use 15bit ECC*/
 		denali->nand.ecc.strength = 15;
-		denali->nand.ecc.layout = &nand_15bit_oob;
 		denali->nand.ecc.bytes = ECC_15BITS;
 		iowrite32(15, denali->flash_reg + ECC_CORRECTION);
 	} else if (mtd->oobsize < (denali->bbtskipbytes +
@@ -1571,20 +1598,13 @@ int denali_init(struct denali_nand_info *denali)
 		goto failed_req_irq;
 	} else {
 		denali->nand.ecc.strength = 8;
-		denali->nand.ecc.layout = &nand_8bit_oob;
 		denali->nand.ecc.bytes = ECC_8BITS;
 		iowrite32(8, denali->flash_reg + ECC_CORRECTION);
 	}
 
+	mtd_set_ooblayout(mtd, &denali_ooblayout_ops);
 	denali->nand.ecc.bytes *= denali->devnum;
 	denali->nand.ecc.strength *= denali->devnum;
-	denali->nand.ecc.layout->eccbytes *=
-		mtd->writesize / ECC_SECTOR_SIZE;
-	denali->nand.ecc.layout->oobfree[0].offset =
-		denali->bbtskipbytes + denali->nand.ecc.layout->eccbytes;
-	denali->nand.ecc.layout->oobfree[0].length =
-		mtd->oobsize - denali->nand.ecc.layout->eccbytes -
-		denali->bbtskipbytes;
 
 	/*
 	 * Let driver know the total blocks number and how many blocks
-- 
2.5.0

[PATCH v5 28/50] mtd: nand: diskonchip: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/diskonchip.c | 60 ++++++++++++++++++++++++++++++++-----------
 1 file changed, 45 insertions(+), 15 deletions(-)

diff --git a/drivers/mtd/nand/diskonchip.c b/drivers/mtd/nand/diskonchip.c
index 547c100..a023ab9 100644
--- a/drivers/mtd/nand/diskonchip.c
+++ b/drivers/mtd/nand/diskonchip.c
@@ -950,20 +950,50 @@ static int doc200x_correct_data(struct mtd_info *mtd, u_char *dat,
 
 //u_char mydatabuf[528];
 
-/* The strange out-of-order .oobfree list below is a (possibly unneeded)
- * attempt to retain compatibility.  It used to read:
- * 	.oobfree = { {8, 8} }
- * Since that leaves two bytes unusable, it was changed.  But the following
- * scheme might affect existing jffs2 installs by moving the cleanmarker:
- * 	.oobfree = { {6, 10} }
- * jffs2 seems to handle the above gracefully, but the current scheme seems
- * safer.  The only problem with it is that any code that parses oobfree must
- * be able to handle out-of-order segments.
- */
-static struct nand_ecclayout doc200x_oobinfo = {
-	.eccbytes = 6,
-	.eccpos = {0, 1, 2, 3, 4, 5},
-	.oobfree = {{8, 8}, {6, 2}}
+static int doc200x_ooblayout_ecc(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 0;
+	oobregion->length = 6;
+
+	return 0;
+}
+
+static int doc200x_ooblayout_free(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	if (section > 1)
+		return -ERANGE;
+
+	/*
+	 * The strange out-of-order free bytes definition is a (possibly
+	 * unneeded) attempt to retain compatibility.  It used to read:
+	 *	.oobfree = { {8, 8} }
+	 * Since that leaves two bytes unusable, it was changed.  But the
+	 * following scheme might affect existing jffs2 installs by moving the
+	 * cleanmarker:
+	 *	.oobfree = { {6, 10} }
+	 * jffs2 seems to handle the above gracefully, but the current scheme
+	 * seems safer. The only problem with it is that any code retrieving
+	 * free bytes position must be able to handle out-of-order segments.
+	 */
+	if (!section) {
+		oobregion->offset = 8;
+		oobregion->length = 8;
+	} else {
+		oobregion->offset = 6;
+		oobregion->length = 2;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops doc200x_ooblayout_ops = {
+	.ecc = doc200x_ooblayout_ecc,
+	.free = doc200x_ooblayout_free,
 };
 
 /* Find the (I)NFTL Media Header, and optionally also the mirror media header.
@@ -1537,6 +1567,7 @@ static int __init doc_probe(unsigned long physadr)
 	nand->bbt_md		= nand->bbt_td + 1;
 
 	mtd->owner		= THIS_MODULE;
+	mtd_set_ooblayout(mtd, &doc200x_ooblayout_ops);
 
 	nand_set_controller_data(nand, doc);
 	nand->select_chip	= doc200x_select_chip;
@@ -1548,7 +1579,6 @@ static int __init doc_probe(unsigned long physadr)
 	nand->ecc.calculate	= doc200x_calculate_ecc;
 	nand->ecc.correct	= doc200x_correct_data;
 
-	nand->ecc.layout	= &doc200x_oobinfo;
 	nand->ecc.mode		= NAND_ECC_HW_SYNDROME;
 	nand->ecc.size		= 512;
 	nand->ecc.bytes		= 6;
-- 
2.5.0

[PATCH v5 28/50] mtd: nand: diskonchip: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/mtd/nand/diskonchip.c | 60 ++++++++++++++++++++++++++++++++-----------
 1 file changed, 45 insertions(+), 15 deletions(-)

diff --git a/drivers/mtd/nand/diskonchip.c b/drivers/mtd/nand/diskonchip.c
index 547c100..a023ab9 100644
--- a/drivers/mtd/nand/diskonchip.c
+++ b/drivers/mtd/nand/diskonchip.c
@@ -950,20 +950,50 @@ static int doc200x_correct_data(struct mtd_info *mtd, u_char *dat,
 
 //u_char mydatabuf[528];
 
-/* The strange out-of-order .oobfree list below is a (possibly unneeded)
- * attempt to retain compatibility.  It used to read:
- * 	.oobfree = { {8, 8} }
- * Since that leaves two bytes unusable, it was changed.  But the following
- * scheme might affect existing jffs2 installs by moving the cleanmarker:
- * 	.oobfree = { {6, 10} }
- * jffs2 seems to handle the above gracefully, but the current scheme seems
- * safer.  The only problem with it is that any code that parses oobfree must
- * be able to handle out-of-order segments.
- */
-static struct nand_ecclayout doc200x_oobinfo = {
-	.eccbytes = 6,
-	.eccpos = {0, 1, 2, 3, 4, 5},
-	.oobfree = {{8, 8}, {6, 2}}
+static int doc200x_ooblayout_ecc(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 0;
+	oobregion->length = 6;
+
+	return 0;
+}
+
+static int doc200x_ooblayout_free(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	if (section > 1)
+		return -ERANGE;
+
+	/*
+	 * The strange out-of-order free bytes definition is a (possibly
+	 * unneeded) attempt to retain compatibility.  It used to read:
+	 *	.oobfree = { {8, 8} }
+	 * Since that leaves two bytes unusable, it was changed.  But the
+	 * following scheme might affect existing jffs2 installs by moving the
+	 * cleanmarker:
+	 *	.oobfree = { {6, 10} }
+	 * jffs2 seems to handle the above gracefully, but the current scheme
+	 * seems safer. The only problem with it is that any code retrieving
+	 * free bytes position must be able to handle out-of-order segments.
+	 */
+	if (!section) {
+		oobregion->offset = 8;
+		oobregion->length = 8;
+	} else {
+		oobregion->offset = 6;
+		oobregion->length = 2;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops doc200x_ooblayout_ops = {
+	.ecc = doc200x_ooblayout_ecc,
+	.free = doc200x_ooblayout_free,
 };
 
 /* Find the (I)NFTL Media Header, and optionally also the mirror media header.
@@ -1537,6 +1567,7 @@ static int __init doc_probe(unsigned long physadr)
 	nand->bbt_md		= nand->bbt_td + 1;
 
 	mtd->owner		= THIS_MODULE;
+	mtd_set_ooblayout(mtd, &doc200x_ooblayout_ops);
 
 	nand_set_controller_data(nand, doc);
 	nand->select_chip	= doc200x_select_chip;
@@ -1548,7 +1579,6 @@ static int __init doc_probe(unsigned long physadr)
 	nand->ecc.calculate	= doc200x_calculate_ecc;
 	nand->ecc.correct	= doc200x_correct_data;
 
-	nand->ecc.layout	= &doc200x_oobinfo;
 	nand->ecc.mode		= NAND_ECC_HW_SYNDROME;
 	nand->ecc.size		= 512;
 	nand->ecc.bytes		= 6;
-- 
2.5.0

[PATCH v5 28/50] mtd: nand: diskonchip: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/diskonchip.c | 60 ++++++++++++++++++++++++++++++++-----------
 1 file changed, 45 insertions(+), 15 deletions(-)

diff --git a/drivers/mtd/nand/diskonchip.c b/drivers/mtd/nand/diskonchip.c
index 547c100..a023ab9 100644
--- a/drivers/mtd/nand/diskonchip.c
+++ b/drivers/mtd/nand/diskonchip.c
@@ -950,20 +950,50 @@ static int doc200x_correct_data(struct mtd_info *mtd, u_char *dat,
 
 //u_char mydatabuf[528];
 
-/* The strange out-of-order .oobfree list below is a (possibly unneeded)
- * attempt to retain compatibility.  It used to read:
- * 	.oobfree = { {8, 8} }
- * Since that leaves two bytes unusable, it was changed.  But the following
- * scheme might affect existing jffs2 installs by moving the cleanmarker:
- * 	.oobfree = { {6, 10} }
- * jffs2 seems to handle the above gracefully, but the current scheme seems
- * safer.  The only problem with it is that any code that parses oobfree must
- * be able to handle out-of-order segments.
- */
-static struct nand_ecclayout doc200x_oobinfo = {
-	.eccbytes = 6,
-	.eccpos = {0, 1, 2, 3, 4, 5},
-	.oobfree = {{8, 8}, {6, 2}}
+static int doc200x_ooblayout_ecc(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 0;
+	oobregion->length = 6;
+
+	return 0;
+}
+
+static int doc200x_ooblayout_free(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	if (section > 1)
+		return -ERANGE;
+
+	/*
+	 * The strange out-of-order free bytes definition is a (possibly
+	 * unneeded) attempt to retain compatibility.  It used to read:
+	 *	.oobfree = { {8, 8} }
+	 * Since that leaves two bytes unusable, it was changed.  But the
+	 * following scheme might affect existing jffs2 installs by moving the
+	 * cleanmarker:
+	 *	.oobfree = { {6, 10} }
+	 * jffs2 seems to handle the above gracefully, but the current scheme
+	 * seems safer. The only problem with it is that any code retrieving
+	 * free bytes position must be able to handle out-of-order segments.
+	 */
+	if (!section) {
+		oobregion->offset = 8;
+		oobregion->length = 8;
+	} else {
+		oobregion->offset = 6;
+		oobregion->length = 2;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops doc200x_ooblayout_ops = {
+	.ecc = doc200x_ooblayout_ecc,
+	.free = doc200x_ooblayout_free,
 };
 
 /* Find the (I)NFTL Media Header, and optionally also the mirror media header.
@@ -1537,6 +1567,7 @@ static int __init doc_probe(unsigned long physadr)
 	nand->bbt_md		= nand->bbt_td + 1;
 
 	mtd->owner		= THIS_MODULE;
+	mtd_set_ooblayout(mtd, &doc200x_ooblayout_ops);
 
 	nand_set_controller_data(nand, doc);
 	nand->select_chip	= doc200x_select_chip;
@@ -1548,7 +1579,6 @@ static int __init doc_probe(unsigned long physadr)
 	nand->ecc.calculate	= doc200x_calculate_ecc;
 	nand->ecc.correct	= doc200x_correct_data;
 
-	nand->ecc.layout	= &doc200x_oobinfo;
 	nand->ecc.mode		= NAND_ECC_HW_SYNDROME;
 	nand->ecc.size		= 512;
 	nand->ecc.bytes		= 6;
-- 
2.5.0

[PATCH v5 29/50] mtd: nand: docg4: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/docg4.c | 33 ++++++++++++++++++++++++++++-----
 1 file changed, 28 insertions(+), 5 deletions(-)

diff --git a/drivers/mtd/nand/docg4.c b/drivers/mtd/nand/docg4.c
index d86a60e..4731699 100644
--- a/drivers/mtd/nand/docg4.c
+++ b/drivers/mtd/nand/docg4.c
@@ -222,10 +222,33 @@ struct docg4_priv {
  * Bytes 8 - 14 are hw-generated ecc covering entire page + oob bytes 0 - 14.
  * Byte 15 (the last) is used by the driver as a "page written" flag.
  */
-static struct nand_ecclayout docg4_oobinfo = {
-	.eccbytes = 9,
-	.eccpos = {7, 8, 9, 10, 11, 12, 13, 14, 15},
-	.oobfree = { {.offset = 2, .length = 5} }
+static int docg4_ooblayout_ecc(struct mtd_info *mtd, int section,
+			       struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 7;
+	oobregion->length = 9;
+
+	return 0;
+}
+
+static int docg4_ooblayout_free(struct mtd_info *mtd, int section,
+				struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 2;
+	oobregion->length = 5;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops docg4_ooblayout_ops = {
+	.ecc = docg4_ooblayout_ecc,
+	.free = docg4_ooblayout_free,
 };
 
 /*
@@ -1209,6 +1232,7 @@ static void __init init_mtd_structs(struct mtd_info *mtd)
 	mtd->writesize = DOCG4_PAGE_SIZE;
 	mtd->erasesize = DOCG4_BLOCK_SIZE;
 	mtd->oobsize = DOCG4_OOB_SIZE;
+	mtd_set_ooblayout(mtd, &docg4_ooblayout_ops);
 	nand->chipsize = DOCG4_CHIP_SIZE;
 	nand->chip_shift = DOCG4_CHIP_SHIFT;
 	nand->bbt_erase_shift = nand->phys_erase_shift = DOCG4_ERASE_SHIFT;
@@ -1217,7 +1241,6 @@ static void __init init_mtd_structs(struct mtd_info *mtd)
 	nand->pagemask = 0x3ffff;
 	nand->badblockpos = NAND_LARGE_BADBLOCK_POS;
 	nand->badblockbits = 8;
-	nand->ecc.layout = &docg4_oobinfo;
 	nand->ecc.mode = NAND_ECC_HW_SYNDROME;
 	nand->ecc.size = DOCG4_PAGE_SIZE;
 	nand->ecc.prepad = 8;
-- 
2.5.0

[PATCH v5 29/50] mtd: nand: docg4: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/mtd/nand/docg4.c | 33 ++++++++++++++++++++++++++++-----
 1 file changed, 28 insertions(+), 5 deletions(-)

diff --git a/drivers/mtd/nand/docg4.c b/drivers/mtd/nand/docg4.c
index d86a60e..4731699 100644
--- a/drivers/mtd/nand/docg4.c
+++ b/drivers/mtd/nand/docg4.c
@@ -222,10 +222,33 @@ struct docg4_priv {
  * Bytes 8 - 14 are hw-generated ecc covering entire page + oob bytes 0 - 14.
  * Byte 15 (the last) is used by the driver as a "page written" flag.
  */
-static struct nand_ecclayout docg4_oobinfo = {
-	.eccbytes = 9,
-	.eccpos = {7, 8, 9, 10, 11, 12, 13, 14, 15},
-	.oobfree = { {.offset = 2, .length = 5} }
+static int docg4_ooblayout_ecc(struct mtd_info *mtd, int section,
+			       struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 7;
+	oobregion->length = 9;
+
+	return 0;
+}
+
+static int docg4_ooblayout_free(struct mtd_info *mtd, int section,
+				struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 2;
+	oobregion->length = 5;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops docg4_ooblayout_ops = {
+	.ecc = docg4_ooblayout_ecc,
+	.free = docg4_ooblayout_free,
 };
 
 /*
@@ -1209,6 +1232,7 @@ static void __init init_mtd_structs(struct mtd_info *mtd)
 	mtd->writesize = DOCG4_PAGE_SIZE;
 	mtd->erasesize = DOCG4_BLOCK_SIZE;
 	mtd->oobsize = DOCG4_OOB_SIZE;
+	mtd_set_ooblayout(mtd, &docg4_ooblayout_ops);
 	nand->chipsize = DOCG4_CHIP_SIZE;
 	nand->chip_shift = DOCG4_CHIP_SHIFT;
 	nand->bbt_erase_shift = nand->phys_erase_shift = DOCG4_ERASE_SHIFT;
@@ -1217,7 +1241,6 @@ static void __init init_mtd_structs(struct mtd_info *mtd)
 	nand->pagemask = 0x3ffff;
 	nand->badblockpos = NAND_LARGE_BADBLOCK_POS;
 	nand->badblockbits = 8;
-	nand->ecc.layout = &docg4_oobinfo;
 	nand->ecc.mode = NAND_ECC_HW_SYNDROME;
 	nand->ecc.size = DOCG4_PAGE_SIZE;
 	nand->ecc.prepad = 8;
-- 
2.5.0

[PATCH v5 29/50] mtd: nand: docg4: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/docg4.c | 33 ++++++++++++++++++++++++++++-----
 1 file changed, 28 insertions(+), 5 deletions(-)

diff --git a/drivers/mtd/nand/docg4.c b/drivers/mtd/nand/docg4.c
index d86a60e..4731699 100644
--- a/drivers/mtd/nand/docg4.c
+++ b/drivers/mtd/nand/docg4.c
@@ -222,10 +222,33 @@ struct docg4_priv {
  * Bytes 8 - 14 are hw-generated ecc covering entire page + oob bytes 0 - 14.
  * Byte 15 (the last) is used by the driver as a "page written" flag.
  */
-static struct nand_ecclayout docg4_oobinfo = {
-	.eccbytes = 9,
-	.eccpos = {7, 8, 9, 10, 11, 12, 13, 14, 15},
-	.oobfree = { {.offset = 2, .length = 5} }
+static int docg4_ooblayout_ecc(struct mtd_info *mtd, int section,
+			       struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 7;
+	oobregion->length = 9;
+
+	return 0;
+}
+
+static int docg4_ooblayout_free(struct mtd_info *mtd, int section,
+				struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 2;
+	oobregion->length = 5;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops docg4_ooblayout_ops = {
+	.ecc = docg4_ooblayout_ecc,
+	.free = docg4_ooblayout_free,
 };
 
 /*
@@ -1209,6 +1232,7 @@ static void __init init_mtd_structs(struct mtd_info *mtd)
 	mtd->writesize = DOCG4_PAGE_SIZE;
 	mtd->erasesize = DOCG4_BLOCK_SIZE;
 	mtd->oobsize = DOCG4_OOB_SIZE;
+	mtd_set_ooblayout(mtd, &docg4_ooblayout_ops);
 	nand->chipsize = DOCG4_CHIP_SIZE;
 	nand->chip_shift = DOCG4_CHIP_SHIFT;
 	nand->bbt_erase_shift = nand->phys_erase_shift = DOCG4_ERASE_SHIFT;
@@ -1217,7 +1241,6 @@ static void __init init_mtd_structs(struct mtd_info *mtd)
 	nand->pagemask = 0x3ffff;
 	nand->badblockpos = NAND_LARGE_BADBLOCK_POS;
 	nand->badblockbits = 8;
-	nand->ecc.layout = &docg4_oobinfo;
 	nand->ecc.mode = NAND_ECC_HW_SYNDROME;
 	nand->ecc.size = DOCG4_PAGE_SIZE;
 	nand->ecc.prepad = 8;
-- 
2.5.0

[PATCH v5 30/50] mtd: nand: fsl_elbc: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/fsl_elbc_nand.c | 83 +++++++++++++++++++++++-----------------
 1 file changed, 47 insertions(+), 36 deletions(-)

diff --git a/drivers/mtd/nand/fsl_elbc_nand.c b/drivers/mtd/nand/fsl_elbc_nand.c
index 059d5f7..487eae0 100644
--- a/drivers/mtd/nand/fsl_elbc_nand.c
+++ b/drivers/mtd/nand/fsl_elbc_nand.c
@@ -79,32 +79,53 @@ struct fsl_elbc_fcm_ctrl {
 
 /* These map to the positions used by the FCM hardware ECC generator */
 
-/* Small Page FLASH with FMR[ECCM] = 0 */
-static struct nand_ecclayout fsl_elbc_oob_sp_eccm0 = {
-	.eccbytes = 3,
-	.eccpos = {6, 7, 8},
-	.oobfree = { {0, 5}, {9, 7} },
-};
+static int fsl_elbc_ooblayout_ecc(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct fsl_elbc_mtd *priv = nand_get_controller_data(chip);
 
-/* Small Page FLASH with FMR[ECCM] = 1 */
-static struct nand_ecclayout fsl_elbc_oob_sp_eccm1 = {
-	.eccbytes = 3,
-	.eccpos = {8, 9, 10},
-	.oobfree = { {0, 5}, {6, 2}, {11, 5} },
-};
+	if (section >= chip->ecc.steps)
+		return -ERANGE;
 
-/* Large Page FLASH with FMR[ECCM] = 0 */
-static struct nand_ecclayout fsl_elbc_oob_lp_eccm0 = {
-	.eccbytes = 12,
-	.eccpos = {6, 7, 8, 22, 23, 24, 38, 39, 40, 54, 55, 56},
-	.oobfree = { {1, 5}, {9, 13}, {25, 13}, {41, 13}, {57, 7} },
-};
+	oobregion->offset = (16 * section) + 6;
+	if (priv->fmr & FMR_ECCM)
+		oobregion->offset += 2;
 
-/* Large Page FLASH with FMR[ECCM] = 1 */
-static struct nand_ecclayout fsl_elbc_oob_lp_eccm1 = {
-	.eccbytes = 12,
-	.eccpos = {8, 9, 10, 24, 25, 26, 40, 41, 42, 56, 57, 58},
-	.oobfree = { {1, 7}, {11, 13}, {27, 13}, {43, 13}, {59, 5} },
+	oobregion->length = chip->ecc.bytes;
+
+	return 0;
+}
+
+static int fsl_elbc_ooblayout_free(struct mtd_info *mtd, int section,
+				   struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct fsl_elbc_mtd *priv = nand_get_controller_data(chip);
+
+	if (section > chip->ecc.steps)
+		return -ERANGE;
+
+	if (!section) {
+		oobregion->offset = 0;
+		if (mtd->writesize > 512)
+			oobregion->offset++;
+		oobregion->length = (priv->fmr & FMR_ECCM) ? 7 : 5;
+	} else {
+		oobregion->offset = (16 * section) -
+				    ((priv->fmr & FMR_ECCM) ? 5 : 7);
+		if (section < chip->ecc.steps)
+			oobregion->length = 13;
+		else
+			oobregion->length = mtd->oobsize - oobregion->offset;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops fsl_elbc_ooblayout_ops = {
+	.ecc = fsl_elbc_ooblayout_ecc,
+	.free = fsl_elbc_ooblayout_free,
 };
 
 /*
@@ -657,8 +678,8 @@ static int fsl_elbc_chip_init_tail(struct mtd_info *mtd)
 	        chip->ecc.bytes);
 	dev_dbg(priv->dev, "fsl_elbc_init: nand->ecc.total = %d\n",
 	        chip->ecc.total);
-	dev_dbg(priv->dev, "fsl_elbc_init: nand->ecc.layout = %p\n",
-	        chip->ecc.layout);
+	dev_dbg(priv->dev, "fsl_elbc_init: mtd->ooblayout = %p\n",
+		mtd->ooblayout);
 	dev_dbg(priv->dev, "fsl_elbc_init: mtd->flags = %08x\n", mtd->flags);
 	dev_dbg(priv->dev, "fsl_elbc_init: mtd->size = %lld\n", mtd->size);
 	dev_dbg(priv->dev, "fsl_elbc_init: mtd->erasesize = %d\n",
@@ -675,14 +696,6 @@ static int fsl_elbc_chip_init_tail(struct mtd_info *mtd)
 	} else if (mtd->writesize == 2048) {
 		priv->page_size = 1;
 		setbits32(&lbc->bank[priv->bank].or, OR_FCM_PGS);
-		/* adjust ecc setup if needed */
-		if ((in_be32(&lbc->bank[priv->bank].br) & BR_DECC) ==
-		    BR_DECC_CHK_GEN) {
-			chip->ecc.size = 512;
-			chip->ecc.layout = (priv->fmr & FMR_ECCM) ?
-			                   &fsl_elbc_oob_lp_eccm1 :
-			                   &fsl_elbc_oob_lp_eccm0;
-		}
 	} else {
 		dev_err(priv->dev,
 		        "fsl_elbc_init: page size %d is not supported\n",
@@ -780,9 +793,7 @@ static int fsl_elbc_chip_init(struct fsl_elbc_mtd *priv)
 	if ((in_be32(&lbc->bank[priv->bank].br) & BR_DECC) ==
 	    BR_DECC_CHK_GEN) {
 		chip->ecc.mode = NAND_ECC_HW;
-		/* put in small page settings and adjust later if needed */
-		chip->ecc.layout = (priv->fmr & FMR_ECCM) ?
-				&fsl_elbc_oob_sp_eccm1 : &fsl_elbc_oob_sp_eccm0;
+		mtd_set_ooblayout(mtd, &fsl_elbc_ooblayout_ops);
 		chip->ecc.size = 512;
 		chip->ecc.bytes = 3;
 		chip->ecc.strength = 1;
-- 
2.5.0

[PATCH v5 30/50] mtd: nand: fsl_elbc: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/mtd/nand/fsl_elbc_nand.c | 83 +++++++++++++++++++++++-----------------
 1 file changed, 47 insertions(+), 36 deletions(-)

diff --git a/drivers/mtd/nand/fsl_elbc_nand.c b/drivers/mtd/nand/fsl_elbc_nand.c
index 059d5f7..487eae0 100644
--- a/drivers/mtd/nand/fsl_elbc_nand.c
+++ b/drivers/mtd/nand/fsl_elbc_nand.c
@@ -79,32 +79,53 @@ struct fsl_elbc_fcm_ctrl {
 
 /* These map to the positions used by the FCM hardware ECC generator */
 
-/* Small Page FLASH with FMR[ECCM] = 0 */
-static struct nand_ecclayout fsl_elbc_oob_sp_eccm0 = {
-	.eccbytes = 3,
-	.eccpos = {6, 7, 8},
-	.oobfree = { {0, 5}, {9, 7} },
-};
+static int fsl_elbc_ooblayout_ecc(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct fsl_elbc_mtd *priv = nand_get_controller_data(chip);
 
-/* Small Page FLASH with FMR[ECCM] = 1 */
-static struct nand_ecclayout fsl_elbc_oob_sp_eccm1 = {
-	.eccbytes = 3,
-	.eccpos = {8, 9, 10},
-	.oobfree = { {0, 5}, {6, 2}, {11, 5} },
-};
+	if (section >= chip->ecc.steps)
+		return -ERANGE;
 
-/* Large Page FLASH with FMR[ECCM] = 0 */
-static struct nand_ecclayout fsl_elbc_oob_lp_eccm0 = {
-	.eccbytes = 12,
-	.eccpos = {6, 7, 8, 22, 23, 24, 38, 39, 40, 54, 55, 56},
-	.oobfree = { {1, 5}, {9, 13}, {25, 13}, {41, 13}, {57, 7} },
-};
+	oobregion->offset = (16 * section) + 6;
+	if (priv->fmr & FMR_ECCM)
+		oobregion->offset += 2;
 
-/* Large Page FLASH with FMR[ECCM] = 1 */
-static struct nand_ecclayout fsl_elbc_oob_lp_eccm1 = {
-	.eccbytes = 12,
-	.eccpos = {8, 9, 10, 24, 25, 26, 40, 41, 42, 56, 57, 58},
-	.oobfree = { {1, 7}, {11, 13}, {27, 13}, {43, 13}, {59, 5} },
+	oobregion->length = chip->ecc.bytes;
+
+	return 0;
+}
+
+static int fsl_elbc_ooblayout_free(struct mtd_info *mtd, int section,
+				   struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct fsl_elbc_mtd *priv = nand_get_controller_data(chip);
+
+	if (section > chip->ecc.steps)
+		return -ERANGE;
+
+	if (!section) {
+		oobregion->offset = 0;
+		if (mtd->writesize > 512)
+			oobregion->offset++;
+		oobregion->length = (priv->fmr & FMR_ECCM) ? 7 : 5;
+	} else {
+		oobregion->offset = (16 * section) -
+				    ((priv->fmr & FMR_ECCM) ? 5 : 7);
+		if (section < chip->ecc.steps)
+			oobregion->length = 13;
+		else
+			oobregion->length = mtd->oobsize - oobregion->offset;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops fsl_elbc_ooblayout_ops = {
+	.ecc = fsl_elbc_ooblayout_ecc,
+	.free = fsl_elbc_ooblayout_free,
 };
 
 /*
@@ -657,8 +678,8 @@ static int fsl_elbc_chip_init_tail(struct mtd_info *mtd)
 	        chip->ecc.bytes);
 	dev_dbg(priv->dev, "fsl_elbc_init: nand->ecc.total = %d\n",
 	        chip->ecc.total);
-	dev_dbg(priv->dev, "fsl_elbc_init: nand->ecc.layout = %p\n",
-	        chip->ecc.layout);
+	dev_dbg(priv->dev, "fsl_elbc_init: mtd->ooblayout = %p\n",
+		mtd->ooblayout);
 	dev_dbg(priv->dev, "fsl_elbc_init: mtd->flags = %08x\n", mtd->flags);
 	dev_dbg(priv->dev, "fsl_elbc_init: mtd->size = %lld\n", mtd->size);
 	dev_dbg(priv->dev, "fsl_elbc_init: mtd->erasesize = %d\n",
@@ -675,14 +696,6 @@ static int fsl_elbc_chip_init_tail(struct mtd_info *mtd)
 	} else if (mtd->writesize == 2048) {
 		priv->page_size = 1;
 		setbits32(&lbc->bank[priv->bank].or, OR_FCM_PGS);
-		/* adjust ecc setup if needed */
-		if ((in_be32(&lbc->bank[priv->bank].br) & BR_DECC) ==
-		    BR_DECC_CHK_GEN) {
-			chip->ecc.size = 512;
-			chip->ecc.layout = (priv->fmr & FMR_ECCM) ?
-			                   &fsl_elbc_oob_lp_eccm1 :
-			                   &fsl_elbc_oob_lp_eccm0;
-		}
 	} else {
 		dev_err(priv->dev,
 		        "fsl_elbc_init: page size %d is not supported\n",
@@ -780,9 +793,7 @@ static int fsl_elbc_chip_init(struct fsl_elbc_mtd *priv)
 	if ((in_be32(&lbc->bank[priv->bank].br) & BR_DECC) ==
 	    BR_DECC_CHK_GEN) {
 		chip->ecc.mode = NAND_ECC_HW;
-		/* put in small page settings and adjust later if needed */
-		chip->ecc.layout = (priv->fmr & FMR_ECCM) ?
-				&fsl_elbc_oob_sp_eccm1 : &fsl_elbc_oob_sp_eccm0;
+		mtd_set_ooblayout(mtd, &fsl_elbc_ooblayout_ops);
 		chip->ecc.size = 512;
 		chip->ecc.bytes = 3;
 		chip->ecc.strength = 1;
-- 
2.5.0

[PATCH v5 30/50] mtd: nand: fsl_elbc: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/fsl_elbc_nand.c | 83 +++++++++++++++++++++++-----------------
 1 file changed, 47 insertions(+), 36 deletions(-)

diff --git a/drivers/mtd/nand/fsl_elbc_nand.c b/drivers/mtd/nand/fsl_elbc_nand.c
index 059d5f7..487eae0 100644
--- a/drivers/mtd/nand/fsl_elbc_nand.c
+++ b/drivers/mtd/nand/fsl_elbc_nand.c
@@ -79,32 +79,53 @@ struct fsl_elbc_fcm_ctrl {
 
 /* These map to the positions used by the FCM hardware ECC generator */
 
-/* Small Page FLASH with FMR[ECCM] = 0 */
-static struct nand_ecclayout fsl_elbc_oob_sp_eccm0 = {
-	.eccbytes = 3,
-	.eccpos = {6, 7, 8},
-	.oobfree = { {0, 5}, {9, 7} },
-};
+static int fsl_elbc_ooblayout_ecc(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct fsl_elbc_mtd *priv = nand_get_controller_data(chip);
 
-/* Small Page FLASH with FMR[ECCM] = 1 */
-static struct nand_ecclayout fsl_elbc_oob_sp_eccm1 = {
-	.eccbytes = 3,
-	.eccpos = {8, 9, 10},
-	.oobfree = { {0, 5}, {6, 2}, {11, 5} },
-};
+	if (section >= chip->ecc.steps)
+		return -ERANGE;
 
-/* Large Page FLASH with FMR[ECCM] = 0 */
-static struct nand_ecclayout fsl_elbc_oob_lp_eccm0 = {
-	.eccbytes = 12,
-	.eccpos = {6, 7, 8, 22, 23, 24, 38, 39, 40, 54, 55, 56},
-	.oobfree = { {1, 5}, {9, 13}, {25, 13}, {41, 13}, {57, 7} },
-};
+	oobregion->offset = (16 * section) + 6;
+	if (priv->fmr & FMR_ECCM)
+		oobregion->offset += 2;
 
-/* Large Page FLASH with FMR[ECCM] = 1 */
-static struct nand_ecclayout fsl_elbc_oob_lp_eccm1 = {
-	.eccbytes = 12,
-	.eccpos = {8, 9, 10, 24, 25, 26, 40, 41, 42, 56, 57, 58},
-	.oobfree = { {1, 7}, {11, 13}, {27, 13}, {43, 13}, {59, 5} },
+	oobregion->length = chip->ecc.bytes;
+
+	return 0;
+}
+
+static int fsl_elbc_ooblayout_free(struct mtd_info *mtd, int section,
+				   struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct fsl_elbc_mtd *priv = nand_get_controller_data(chip);
+
+	if (section > chip->ecc.steps)
+		return -ERANGE;
+
+	if (!section) {
+		oobregion->offset = 0;
+		if (mtd->writesize > 512)
+			oobregion->offset++;
+		oobregion->length = (priv->fmr & FMR_ECCM) ? 7 : 5;
+	} else {
+		oobregion->offset = (16 * section) -
+				    ((priv->fmr & FMR_ECCM) ? 5 : 7);
+		if (section < chip->ecc.steps)
+			oobregion->length = 13;
+		else
+			oobregion->length = mtd->oobsize - oobregion->offset;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops fsl_elbc_ooblayout_ops = {
+	.ecc = fsl_elbc_ooblayout_ecc,
+	.free = fsl_elbc_ooblayout_free,
 };
 
 /*
@@ -657,8 +678,8 @@ static int fsl_elbc_chip_init_tail(struct mtd_info *mtd)
 	        chip->ecc.bytes);
 	dev_dbg(priv->dev, "fsl_elbc_init: nand->ecc.total = %d\n",
 	        chip->ecc.total);
-	dev_dbg(priv->dev, "fsl_elbc_init: nand->ecc.layout = %p\n",
-	        chip->ecc.layout);
+	dev_dbg(priv->dev, "fsl_elbc_init: mtd->ooblayout = %p\n",
+		mtd->ooblayout);
 	dev_dbg(priv->dev, "fsl_elbc_init: mtd->flags = %08x\n", mtd->flags);
 	dev_dbg(priv->dev, "fsl_elbc_init: mtd->size = %lld\n", mtd->size);
 	dev_dbg(priv->dev, "fsl_elbc_init: mtd->erasesize = %d\n",
@@ -675,14 +696,6 @@ static int fsl_elbc_chip_init_tail(struct mtd_info *mtd)
 	} else if (mtd->writesize == 2048) {
 		priv->page_size = 1;
 		setbits32(&lbc->bank[priv->bank].or, OR_FCM_PGS);
-		/* adjust ecc setup if needed */
-		if ((in_be32(&lbc->bank[priv->bank].br) & BR_DECC) ==
-		    BR_DECC_CHK_GEN) {
-			chip->ecc.size = 512;
-			chip->ecc.layout = (priv->fmr & FMR_ECCM) ?
-			                   &fsl_elbc_oob_lp_eccm1 :
-			                   &fsl_elbc_oob_lp_eccm0;
-		}
 	} else {
 		dev_err(priv->dev,
 		        "fsl_elbc_init: page size %d is not supported\n",
@@ -780,9 +793,7 @@ static int fsl_elbc_chip_init(struct fsl_elbc_mtd *priv)
 	if ((in_be32(&lbc->bank[priv->bank].br) & BR_DECC) ==
 	    BR_DECC_CHK_GEN) {
 		chip->ecc.mode = NAND_ECC_HW;
-		/* put in small page settings and adjust later if needed */
-		chip->ecc.layout = (priv->fmr & FMR_ECCM) ?
-				&fsl_elbc_oob_sp_eccm1 : &fsl_elbc_oob_sp_eccm0;
+		mtd_set_ooblayout(mtd, &fsl_elbc_ooblayout_ops);
 		chip->ecc.size = 512;
 		chip->ecc.bytes = 3;
 		chip->ecc.strength = 1;
-- 
2.5.0

[PATCH v5 31/50] mtd: nand: fsl_ifc: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/fsl_ifc_nand.c | 230 ++++++++++++----------------------------
 1 file changed, 66 insertions(+), 164 deletions(-)

diff --git a/drivers/mtd/nand/fsl_ifc_nand.c b/drivers/mtd/nand/fsl_ifc_nand.c
index 2e970ac..5532c38 100644
--- a/drivers/mtd/nand/fsl_ifc_nand.c
+++ b/drivers/mtd/nand/fsl_ifc_nand.c
@@ -67,136 +67,6 @@ struct fsl_ifc_nand_ctrl {
 
 static struct fsl_ifc_nand_ctrl *ifc_nand_ctrl;
 
-/* 512-byte page with 4-bit ECC, 8-bit */
-static struct nand_ecclayout oob_512_8bit_ecc4 = {
-	.eccbytes = 8,
-	.eccpos = {8, 9, 10, 11, 12, 13, 14, 15},
-	.oobfree = { {0, 5}, {6, 2} },
-};
-
-/* 512-byte page with 4-bit ECC, 16-bit */
-static struct nand_ecclayout oob_512_16bit_ecc4 = {
-	.eccbytes = 8,
-	.eccpos = {8, 9, 10, 11, 12, 13, 14, 15},
-	.oobfree = { {2, 6}, },
-};
-
-/* 2048-byte page size with 4-bit ECC */
-static struct nand_ecclayout oob_2048_ecc4 = {
-	.eccbytes = 32,
-	.eccpos = {
-		8, 9, 10, 11, 12, 13, 14, 15,
-		16, 17, 18, 19, 20, 21, 22, 23,
-		24, 25, 26, 27, 28, 29, 30, 31,
-		32, 33, 34, 35, 36, 37, 38, 39,
-	},
-	.oobfree = { {2, 6}, {40, 24} },
-};
-
-/* 4096-byte page size with 4-bit ECC */
-static struct nand_ecclayout oob_4096_ecc4 = {
-	.eccbytes = 64,
-	.eccpos = {
-		8, 9, 10, 11, 12, 13, 14, 15,
-		16, 17, 18, 19, 20, 21, 22, 23,
-		24, 25, 26, 27, 28, 29, 30, 31,
-		32, 33, 34, 35, 36, 37, 38, 39,
-		40, 41, 42, 43, 44, 45, 46, 47,
-		48, 49, 50, 51, 52, 53, 54, 55,
-		56, 57, 58, 59, 60, 61, 62, 63,
-		64, 65, 66, 67, 68, 69, 70, 71,
-	},
-	.oobfree = { {2, 6}, {72, 56} },
-};
-
-/* 4096-byte page size with 8-bit ECC -- requires 218-byte OOB */
-static struct nand_ecclayout oob_4096_ecc8 = {
-	.eccbytes = 128,
-	.eccpos = {
-		8, 9, 10, 11, 12, 13, 14, 15,
-		16, 17, 18, 19, 20, 21, 22, 23,
-		24, 25, 26, 27, 28, 29, 30, 31,
-		32, 33, 34, 35, 36, 37, 38, 39,
-		40, 41, 42, 43, 44, 45, 46, 47,
-		48, 49, 50, 51, 52, 53, 54, 55,
-		56, 57, 58, 59, 60, 61, 62, 63,
-		64, 65, 66, 67, 68, 69, 70, 71,
-		72, 73, 74, 75, 76, 77, 78, 79,
-		80, 81, 82, 83, 84, 85, 86, 87,
-		88, 89, 90, 91, 92, 93, 94, 95,
-		96, 97, 98, 99, 100, 101, 102, 103,
-		104, 105, 106, 107, 108, 109, 110, 111,
-		112, 113, 114, 115, 116, 117, 118, 119,
-		120, 121, 122, 123, 124, 125, 126, 127,
-		128, 129, 130, 131, 132, 133, 134, 135,
-	},
-	.oobfree = { {2, 6}, {136, 82} },
-};
-
-/* 8192-byte page size with 4-bit ECC */
-static struct nand_ecclayout oob_8192_ecc4 = {
-	.eccbytes = 128,
-	.eccpos = {
-		8, 9, 10, 11, 12, 13, 14, 15,
-		16, 17, 18, 19, 20, 21, 22, 23,
-		24, 25, 26, 27, 28, 29, 30, 31,
-		32, 33, 34, 35, 36, 37, 38, 39,
-		40, 41, 42, 43, 44, 45, 46, 47,
-		48, 49, 50, 51, 52, 53, 54, 55,
-		56, 57, 58, 59, 60, 61, 62, 63,
-		64, 65, 66, 67, 68, 69, 70, 71,
-		72, 73, 74, 75, 76, 77, 78, 79,
-		80, 81, 82, 83, 84, 85, 86, 87,
-		88, 89, 90, 91, 92, 93, 94, 95,
-		96, 97, 98, 99, 100, 101, 102, 103,
-		104, 105, 106, 107, 108, 109, 110, 111,
-		112, 113, 114, 115, 116, 117, 118, 119,
-		120, 121, 122, 123, 124, 125, 126, 127,
-		128, 129, 130, 131, 132, 133, 134, 135,
-	},
-	.oobfree = { {2, 6}, {136, 208} },
-};
-
-/* 8192-byte page size with 8-bit ECC -- requires 218-byte OOB */
-static struct nand_ecclayout oob_8192_ecc8 = {
-	.eccbytes = 256,
-	.eccpos = {
-		8, 9, 10, 11, 12, 13, 14, 15,
-		16, 17, 18, 19, 20, 21, 22, 23,
-		24, 25, 26, 27, 28, 29, 30, 31,
-		32, 33, 34, 35, 36, 37, 38, 39,
-		40, 41, 42, 43, 44, 45, 46, 47,
-		48, 49, 50, 51, 52, 53, 54, 55,
-		56, 57, 58, 59, 60, 61, 62, 63,
-		64, 65, 66, 67, 68, 69, 70, 71,
-		72, 73, 74, 75, 76, 77, 78, 79,
-		80, 81, 82, 83, 84, 85, 86, 87,
-		88, 89, 90, 91, 92, 93, 94, 95,
-		96, 97, 98, 99, 100, 101, 102, 103,
-		104, 105, 106, 107, 108, 109, 110, 111,
-		112, 113, 114, 115, 116, 117, 118, 119,
-		120, 121, 122, 123, 124, 125, 126, 127,
-		128, 129, 130, 131, 132, 133, 134, 135,
-		136, 137, 138, 139, 140, 141, 142, 143,
-		144, 145, 146, 147, 148, 149, 150, 151,
-		152, 153, 154, 155, 156, 157, 158, 159,
-		160, 161, 162, 163, 164, 165, 166, 167,
-		168, 169, 170, 171, 172, 173, 174, 175,
-		176, 177, 178, 179, 180, 181, 182, 183,
-		184, 185, 186, 187, 188, 189, 190, 191,
-		192, 193, 194, 195, 196, 197, 198, 199,
-		200, 201, 202, 203, 204, 205, 206, 207,
-		208, 209, 210, 211, 212, 213, 214, 215,
-		216, 217, 218, 219, 220, 221, 222, 223,
-		224, 225, 226, 227, 228, 229, 230, 231,
-		232, 233, 234, 235, 236, 237, 238, 239,
-		240, 241, 242, 243, 244, 245, 246, 247,
-		248, 249, 250, 251, 252, 253, 254, 255,
-		256, 257, 258, 259, 260, 261, 262, 263,
-	},
-	.oobfree = { {2, 6}, {264, 80} },
-};
-
 /*
  * Generic flash bbt descriptors
  */
@@ -223,6 +93,57 @@ static struct nand_bbt_descr bbt_mirror_descr = {
 	.pattern = mirror_pattern,
 };
 
+static int fsl_ifc_ooblayout_ecc(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 8;
+	oobregion->length = chip->ecc.total;
+
+	return 0;
+}
+
+static int fsl_ifc_ooblayout_free(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section > 1)
+		return -ERANGE;
+
+	if (mtd->writesize == 512 &&
+	    !(chip->options & NAND_BUSWIDTH_16)) {
+		if (!section) {
+			oobregion->offset = 0;
+			oobregion->length = 5;
+		} else {
+			oobregion->offset = 6;
+			oobregion->length = 2;
+		}
+
+		return 0;
+	}
+
+	if (!section) {
+		oobregion->offset = 2;
+		oobregion->length = 6;
+	} else {
+		oobregion->offset = chip->ecc.total + 8;
+		oobregion->length = mtd->oobsize - oobregion->offset;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops fsl_ifc_ooblayout_ops = {
+	.ecc = fsl_ifc_ooblayout_ecc,
+	.free = fsl_ifc_ooblayout_free,
+};
+
 /*
  * Set up the IFC hardware block and page address fields, and the ifc nand
  * structure addr field to point to the correct IFC buffer in memory
@@ -812,8 +733,8 @@ static int fsl_ifc_chip_init_tail(struct mtd_info *mtd)
 							chip->ecc.bytes);
 	dev_dbg(priv->dev, "%s: nand->ecc.total = %d\n", __func__,
 							chip->ecc.total);
-	dev_dbg(priv->dev, "%s: nand->ecc.layout = %p\n", __func__,
-							chip->ecc.layout);
+	dev_dbg(priv->dev, "%s: mtd->ooblayout = %p\n", __func__,
+							mtd->ooblayout);
 	dev_dbg(priv->dev, "%s: mtd->flags = %08x\n", __func__, mtd->flags);
 	dev_dbg(priv->dev, "%s: mtd->size = %lld\n", __func__, mtd->size);
 	dev_dbg(priv->dev, "%s: mtd->erasesize = %d\n", __func__,
@@ -881,7 +802,6 @@ static int fsl_ifc_chip_init(struct fsl_ifc_mtd *priv)
 	struct fsl_ifc_regs __iomem *ifc = ctrl->regs;
 	struct nand_chip *chip = &priv->chip;
 	struct mtd_info *mtd = nand_to_mtd(&priv->chip);
-	struct nand_ecclayout *layout;
 	u32 csor;
 
 	/* Fill in fsl_ifc_mtd structure */
@@ -925,18 +845,9 @@ static int fsl_ifc_chip_init(struct fsl_ifc_mtd *priv)
 
 	csor = ifc_in32(&ifc->csor_cs[priv->bank].csor);
 
-	/* Hardware generates ECC per 512 Bytes */
-	chip->ecc.size = 512;
-	chip->ecc.bytes = 8;
-	chip->ecc.strength = 4;
-
 	switch (csor & CSOR_NAND_PGS_MASK) {
 	case CSOR_NAND_PGS_512:
-		if (chip->options & NAND_BUSWIDTH_16) {
-			layout = &oob_512_16bit_ecc4;
-		} else {
-			layout = &oob_512_8bit_ecc4;
-
+		if (!(chip->options & NAND_BUSWIDTH_16)) {
 			/* Avoid conflict with bad block marker */
 			bbt_main_descr.offs = 0;
 			bbt_mirror_descr.offs = 0;
@@ -946,35 +857,16 @@ static int fsl_ifc_chip_init(struct fsl_ifc_mtd *priv)
 		break;
 
 	case CSOR_NAND_PGS_2K:
-		layout = &oob_2048_ecc4;
 		priv->bufnum_mask = 3;
 		break;
 
 	case CSOR_NAND_PGS_4K:
-		if ((csor & CSOR_NAND_ECC_MODE_MASK) ==
-		    CSOR_NAND_ECC_MODE_4) {
-			layout = &oob_4096_ecc4;
-		} else {
-			layout = &oob_4096_ecc8;
-			chip->ecc.bytes = 16;
-			chip->ecc.strength = 8;
-		}
-
 		priv->bufnum_mask = 1;
 		break;
 
 	case CSOR_NAND_PGS_8K:
-		if ((csor & CSOR_NAND_ECC_MODE_MASK) ==
-		    CSOR_NAND_ECC_MODE_4) {
-			layout = &oob_8192_ecc4;
-		} else {
-			layout = &oob_8192_ecc8;
-			chip->ecc.bytes = 16;
-			chip->ecc.strength = 8;
-		}
-
 		priv->bufnum_mask = 0;
-	break;
+		break;
 
 	default:
 		dev_err(priv->dev, "bad csor %#x: bad page size\n", csor);
@@ -984,7 +876,17 @@ static int fsl_ifc_chip_init(struct fsl_ifc_mtd *priv)
 	/* Must also set CSOR_NAND_ECC_ENC_EN if DEC_EN set */
 	if (csor & CSOR_NAND_ECC_DEC_EN) {
 		chip->ecc.mode = NAND_ECC_HW;
-		chip->ecc.layout = layout;
+		mtd_set_ooblayout(mtd, &fsl_ifc_ooblayout_ops);
+
+		/* Hardware generates ECC per 512 Bytes */
+		chip->ecc.size = 512;
+		if ((csor & CSOR_NAND_ECC_MODE_MASK) == CSOR_NAND_ECC_MODE_4) {
+			chip->ecc.bytes = 8;
+			chip->ecc.strength = 4;
+		} else {
+			chip->ecc.bytes = 16;
+			chip->ecc.strength = 8;
+		}
 	} else {
 		chip->ecc.mode = NAND_ECC_SOFT;
 	}
-- 
2.5.0

[PATCH v5 31/50] mtd: nand: fsl_ifc: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/mtd/nand/fsl_ifc_nand.c | 230 ++++++++++++----------------------------
 1 file changed, 66 insertions(+), 164 deletions(-)

diff --git a/drivers/mtd/nand/fsl_ifc_nand.c b/drivers/mtd/nand/fsl_ifc_nand.c
index 2e970ac..5532c38 100644
--- a/drivers/mtd/nand/fsl_ifc_nand.c
+++ b/drivers/mtd/nand/fsl_ifc_nand.c
@@ -67,136 +67,6 @@ struct fsl_ifc_nand_ctrl {
 
 static struct fsl_ifc_nand_ctrl *ifc_nand_ctrl;
 
-/* 512-byte page with 4-bit ECC, 8-bit */
-static struct nand_ecclayout oob_512_8bit_ecc4 = {
-	.eccbytes = 8,
-	.eccpos = {8, 9, 10, 11, 12, 13, 14, 15},
-	.oobfree = { {0, 5}, {6, 2} },
-};
-
-/* 512-byte page with 4-bit ECC, 16-bit */
-static struct nand_ecclayout oob_512_16bit_ecc4 = {
-	.eccbytes = 8,
-	.eccpos = {8, 9, 10, 11, 12, 13, 14, 15},
-	.oobfree = { {2, 6}, },
-};
-
-/* 2048-byte page size with 4-bit ECC */
-static struct nand_ecclayout oob_2048_ecc4 = {
-	.eccbytes = 32,
-	.eccpos = {
-		8, 9, 10, 11, 12, 13, 14, 15,
-		16, 17, 18, 19, 20, 21, 22, 23,
-		24, 25, 26, 27, 28, 29, 30, 31,
-		32, 33, 34, 35, 36, 37, 38, 39,
-	},
-	.oobfree = { {2, 6}, {40, 24} },
-};
-
-/* 4096-byte page size with 4-bit ECC */
-static struct nand_ecclayout oob_4096_ecc4 = {
-	.eccbytes = 64,
-	.eccpos = {
-		8, 9, 10, 11, 12, 13, 14, 15,
-		16, 17, 18, 19, 20, 21, 22, 23,
-		24, 25, 26, 27, 28, 29, 30, 31,
-		32, 33, 34, 35, 36, 37, 38, 39,
-		40, 41, 42, 43, 44, 45, 46, 47,
-		48, 49, 50, 51, 52, 53, 54, 55,
-		56, 57, 58, 59, 60, 61, 62, 63,
-		64, 65, 66, 67, 68, 69, 70, 71,
-	},
-	.oobfree = { {2, 6}, {72, 56} },
-};
-
-/* 4096-byte page size with 8-bit ECC -- requires 218-byte OOB */
-static struct nand_ecclayout oob_4096_ecc8 = {
-	.eccbytes = 128,
-	.eccpos = {
-		8, 9, 10, 11, 12, 13, 14, 15,
-		16, 17, 18, 19, 20, 21, 22, 23,
-		24, 25, 26, 27, 28, 29, 30, 31,
-		32, 33, 34, 35, 36, 37, 38, 39,
-		40, 41, 42, 43, 44, 45, 46, 47,
-		48, 49, 50, 51, 52, 53, 54, 55,
-		56, 57, 58, 59, 60, 61, 62, 63,
-		64, 65, 66, 67, 68, 69, 70, 71,
-		72, 73, 74, 75, 76, 77, 78, 79,
-		80, 81, 82, 83, 84, 85, 86, 87,
-		88, 89, 90, 91, 92, 93, 94, 95,
-		96, 97, 98, 99, 100, 101, 102, 103,
-		104, 105, 106, 107, 108, 109, 110, 111,
-		112, 113, 114, 115, 116, 117, 118, 119,
-		120, 121, 122, 123, 124, 125, 126, 127,
-		128, 129, 130, 131, 132, 133, 134, 135,
-	},
-	.oobfree = { {2, 6}, {136, 82} },
-};
-
-/* 8192-byte page size with 4-bit ECC */
-static struct nand_ecclayout oob_8192_ecc4 = {
-	.eccbytes = 128,
-	.eccpos = {
-		8, 9, 10, 11, 12, 13, 14, 15,
-		16, 17, 18, 19, 20, 21, 22, 23,
-		24, 25, 26, 27, 28, 29, 30, 31,
-		32, 33, 34, 35, 36, 37, 38, 39,
-		40, 41, 42, 43, 44, 45, 46, 47,
-		48, 49, 50, 51, 52, 53, 54, 55,
-		56, 57, 58, 59, 60, 61, 62, 63,
-		64, 65, 66, 67, 68, 69, 70, 71,
-		72, 73, 74, 75, 76, 77, 78, 79,
-		80, 81, 82, 83, 84, 85, 86, 87,
-		88, 89, 90, 91, 92, 93, 94, 95,
-		96, 97, 98, 99, 100, 101, 102, 103,
-		104, 105, 106, 107, 108, 109, 110, 111,
-		112, 113, 114, 115, 116, 117, 118, 119,
-		120, 121, 122, 123, 124, 125, 126, 127,
-		128, 129, 130, 131, 132, 133, 134, 135,
-	},
-	.oobfree = { {2, 6}, {136, 208} },
-};
-
-/* 8192-byte page size with 8-bit ECC -- requires 218-byte OOB */
-static struct nand_ecclayout oob_8192_ecc8 = {
-	.eccbytes = 256,
-	.eccpos = {
-		8, 9, 10, 11, 12, 13, 14, 15,
-		16, 17, 18, 19, 20, 21, 22, 23,
-		24, 25, 26, 27, 28, 29, 30, 31,
-		32, 33, 34, 35, 36, 37, 38, 39,
-		40, 41, 42, 43, 44, 45, 46, 47,
-		48, 49, 50, 51, 52, 53, 54, 55,
-		56, 57, 58, 59, 60, 61, 62, 63,
-		64, 65, 66, 67, 68, 69, 70, 71,
-		72, 73, 74, 75, 76, 77, 78, 79,
-		80, 81, 82, 83, 84, 85, 86, 87,
-		88, 89, 90, 91, 92, 93, 94, 95,
-		96, 97, 98, 99, 100, 101, 102, 103,
-		104, 105, 106, 107, 108, 109, 110, 111,
-		112, 113, 114, 115, 116, 117, 118, 119,
-		120, 121, 122, 123, 124, 125, 126, 127,
-		128, 129, 130, 131, 132, 133, 134, 135,
-		136, 137, 138, 139, 140, 141, 142, 143,
-		144, 145, 146, 147, 148, 149, 150, 151,
-		152, 153, 154, 155, 156, 157, 158, 159,
-		160, 161, 162, 163, 164, 165, 166, 167,
-		168, 169, 170, 171, 172, 173, 174, 175,
-		176, 177, 178, 179, 180, 181, 182, 183,
-		184, 185, 186, 187, 188, 189, 190, 191,
-		192, 193, 194, 195, 196, 197, 198, 199,
-		200, 201, 202, 203, 204, 205, 206, 207,
-		208, 209, 210, 211, 212, 213, 214, 215,
-		216, 217, 218, 219, 220, 221, 222, 223,
-		224, 225, 226, 227, 228, 229, 230, 231,
-		232, 233, 234, 235, 236, 237, 238, 239,
-		240, 241, 242, 243, 244, 245, 246, 247,
-		248, 249, 250, 251, 252, 253, 254, 255,
-		256, 257, 258, 259, 260, 261, 262, 263,
-	},
-	.oobfree = { {2, 6}, {264, 80} },
-};
-
 /*
  * Generic flash bbt descriptors
  */
@@ -223,6 +93,57 @@ static struct nand_bbt_descr bbt_mirror_descr = {
 	.pattern = mirror_pattern,
 };
 
+static int fsl_ifc_ooblayout_ecc(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 8;
+	oobregion->length = chip->ecc.total;
+
+	return 0;
+}
+
+static int fsl_ifc_ooblayout_free(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section > 1)
+		return -ERANGE;
+
+	if (mtd->writesize == 512 &&
+	    !(chip->options & NAND_BUSWIDTH_16)) {
+		if (!section) {
+			oobregion->offset = 0;
+			oobregion->length = 5;
+		} else {
+			oobregion->offset = 6;
+			oobregion->length = 2;
+		}
+
+		return 0;
+	}
+
+	if (!section) {
+		oobregion->offset = 2;
+		oobregion->length = 6;
+	} else {
+		oobregion->offset = chip->ecc.total + 8;
+		oobregion->length = mtd->oobsize - oobregion->offset;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops fsl_ifc_ooblayout_ops = {
+	.ecc = fsl_ifc_ooblayout_ecc,
+	.free = fsl_ifc_ooblayout_free,
+};
+
 /*
  * Set up the IFC hardware block and page address fields, and the ifc nand
  * structure addr field to point to the correct IFC buffer in memory
@@ -812,8 +733,8 @@ static int fsl_ifc_chip_init_tail(struct mtd_info *mtd)
 							chip->ecc.bytes);
 	dev_dbg(priv->dev, "%s: nand->ecc.total = %d\n", __func__,
 							chip->ecc.total);
-	dev_dbg(priv->dev, "%s: nand->ecc.layout = %p\n", __func__,
-							chip->ecc.layout);
+	dev_dbg(priv->dev, "%s: mtd->ooblayout = %p\n", __func__,
+							mtd->ooblayout);
 	dev_dbg(priv->dev, "%s: mtd->flags = %08x\n", __func__, mtd->flags);
 	dev_dbg(priv->dev, "%s: mtd->size = %lld\n", __func__, mtd->size);
 	dev_dbg(priv->dev, "%s: mtd->erasesize = %d\n", __func__,
@@ -881,7 +802,6 @@ static int fsl_ifc_chip_init(struct fsl_ifc_mtd *priv)
 	struct fsl_ifc_regs __iomem *ifc = ctrl->regs;
 	struct nand_chip *chip = &priv->chip;
 	struct mtd_info *mtd = nand_to_mtd(&priv->chip);
-	struct nand_ecclayout *layout;
 	u32 csor;
 
 	/* Fill in fsl_ifc_mtd structure */
@@ -925,18 +845,9 @@ static int fsl_ifc_chip_init(struct fsl_ifc_mtd *priv)
 
 	csor = ifc_in32(&ifc->csor_cs[priv->bank].csor);
 
-	/* Hardware generates ECC per 512 Bytes */
-	chip->ecc.size = 512;
-	chip->ecc.bytes = 8;
-	chip->ecc.strength = 4;
-
 	switch (csor & CSOR_NAND_PGS_MASK) {
 	case CSOR_NAND_PGS_512:
-		if (chip->options & NAND_BUSWIDTH_16) {
-			layout = &oob_512_16bit_ecc4;
-		} else {
-			layout = &oob_512_8bit_ecc4;
-
+		if (!(chip->options & NAND_BUSWIDTH_16)) {
 			/* Avoid conflict with bad block marker */
 			bbt_main_descr.offs = 0;
 			bbt_mirror_descr.offs = 0;
@@ -946,35 +857,16 @@ static int fsl_ifc_chip_init(struct fsl_ifc_mtd *priv)
 		break;
 
 	case CSOR_NAND_PGS_2K:
-		layout = &oob_2048_ecc4;
 		priv->bufnum_mask = 3;
 		break;
 
 	case CSOR_NAND_PGS_4K:
-		if ((csor & CSOR_NAND_ECC_MODE_MASK) ==
-		    CSOR_NAND_ECC_MODE_4) {
-			layout = &oob_4096_ecc4;
-		} else {
-			layout = &oob_4096_ecc8;
-			chip->ecc.bytes = 16;
-			chip->ecc.strength = 8;
-		}
-
 		priv->bufnum_mask = 1;
 		break;
 
 	case CSOR_NAND_PGS_8K:
-		if ((csor & CSOR_NAND_ECC_MODE_MASK) ==
-		    CSOR_NAND_ECC_MODE_4) {
-			layout = &oob_8192_ecc4;
-		} else {
-			layout = &oob_8192_ecc8;
-			chip->ecc.bytes = 16;
-			chip->ecc.strength = 8;
-		}
-
 		priv->bufnum_mask = 0;
-	break;
+		break;
 
 	default:
 		dev_err(priv->dev, "bad csor %#x: bad page size\n", csor);
@@ -984,7 +876,17 @@ static int fsl_ifc_chip_init(struct fsl_ifc_mtd *priv)
 	/* Must also set CSOR_NAND_ECC_ENC_EN if DEC_EN set */
 	if (csor & CSOR_NAND_ECC_DEC_EN) {
 		chip->ecc.mode = NAND_ECC_HW;
-		chip->ecc.layout = layout;
+		mtd_set_ooblayout(mtd, &fsl_ifc_ooblayout_ops);
+
+		/* Hardware generates ECC per 512 Bytes */
+		chip->ecc.size = 512;
+		if ((csor & CSOR_NAND_ECC_MODE_MASK) == CSOR_NAND_ECC_MODE_4) {
+			chip->ecc.bytes = 8;
+			chip->ecc.strength = 4;
+		} else {
+			chip->ecc.bytes = 16;
+			chip->ecc.strength = 8;
+		}
 	} else {
 		chip->ecc.mode = NAND_ECC_SOFT;
 	}
-- 
2.5.0

[PATCH v5 31/50] mtd: nand: fsl_ifc: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/fsl_ifc_nand.c | 230 ++++++++++++----------------------------
 1 file changed, 66 insertions(+), 164 deletions(-)

diff --git a/drivers/mtd/nand/fsl_ifc_nand.c b/drivers/mtd/nand/fsl_ifc_nand.c
index 2e970ac..5532c38 100644
--- a/drivers/mtd/nand/fsl_ifc_nand.c
+++ b/drivers/mtd/nand/fsl_ifc_nand.c
@@ -67,136 +67,6 @@ struct fsl_ifc_nand_ctrl {
 
 static struct fsl_ifc_nand_ctrl *ifc_nand_ctrl;
 
-/* 512-byte page with 4-bit ECC, 8-bit */
-static struct nand_ecclayout oob_512_8bit_ecc4 = {
-	.eccbytes = 8,
-	.eccpos = {8, 9, 10, 11, 12, 13, 14, 15},
-	.oobfree = { {0, 5}, {6, 2} },
-};
-
-/* 512-byte page with 4-bit ECC, 16-bit */
-static struct nand_ecclayout oob_512_16bit_ecc4 = {
-	.eccbytes = 8,
-	.eccpos = {8, 9, 10, 11, 12, 13, 14, 15},
-	.oobfree = { {2, 6}, },
-};
-
-/* 2048-byte page size with 4-bit ECC */
-static struct nand_ecclayout oob_2048_ecc4 = {
-	.eccbytes = 32,
-	.eccpos = {
-		8, 9, 10, 11, 12, 13, 14, 15,
-		16, 17, 18, 19, 20, 21, 22, 23,
-		24, 25, 26, 27, 28, 29, 30, 31,
-		32, 33, 34, 35, 36, 37, 38, 39,
-	},
-	.oobfree = { {2, 6}, {40, 24} },
-};
-
-/* 4096-byte page size with 4-bit ECC */
-static struct nand_ecclayout oob_4096_ecc4 = {
-	.eccbytes = 64,
-	.eccpos = {
-		8, 9, 10, 11, 12, 13, 14, 15,
-		16, 17, 18, 19, 20, 21, 22, 23,
-		24, 25, 26, 27, 28, 29, 30, 31,
-		32, 33, 34, 35, 36, 37, 38, 39,
-		40, 41, 42, 43, 44, 45, 46, 47,
-		48, 49, 50, 51, 52, 53, 54, 55,
-		56, 57, 58, 59, 60, 61, 62, 63,
-		64, 65, 66, 67, 68, 69, 70, 71,
-	},
-	.oobfree = { {2, 6}, {72, 56} },
-};
-
-/* 4096-byte page size with 8-bit ECC -- requires 218-byte OOB */
-static struct nand_ecclayout oob_4096_ecc8 = {
-	.eccbytes = 128,
-	.eccpos = {
-		8, 9, 10, 11, 12, 13, 14, 15,
-		16, 17, 18, 19, 20, 21, 22, 23,
-		24, 25, 26, 27, 28, 29, 30, 31,
-		32, 33, 34, 35, 36, 37, 38, 39,
-		40, 41, 42, 43, 44, 45, 46, 47,
-		48, 49, 50, 51, 52, 53, 54, 55,
-		56, 57, 58, 59, 60, 61, 62, 63,
-		64, 65, 66, 67, 68, 69, 70, 71,
-		72, 73, 74, 75, 76, 77, 78, 79,
-		80, 81, 82, 83, 84, 85, 86, 87,
-		88, 89, 90, 91, 92, 93, 94, 95,
-		96, 97, 98, 99, 100, 101, 102, 103,
-		104, 105, 106, 107, 108, 109, 110, 111,
-		112, 113, 114, 115, 116, 117, 118, 119,
-		120, 121, 122, 123, 124, 125, 126, 127,
-		128, 129, 130, 131, 132, 133, 134, 135,
-	},
-	.oobfree = { {2, 6}, {136, 82} },
-};
-
-/* 8192-byte page size with 4-bit ECC */
-static struct nand_ecclayout oob_8192_ecc4 = {
-	.eccbytes = 128,
-	.eccpos = {
-		8, 9, 10, 11, 12, 13, 14, 15,
-		16, 17, 18, 19, 20, 21, 22, 23,
-		24, 25, 26, 27, 28, 29, 30, 31,
-		32, 33, 34, 35, 36, 37, 38, 39,
-		40, 41, 42, 43, 44, 45, 46, 47,
-		48, 49, 50, 51, 52, 53, 54, 55,
-		56, 57, 58, 59, 60, 61, 62, 63,
-		64, 65, 66, 67, 68, 69, 70, 71,
-		72, 73, 74, 75, 76, 77, 78, 79,
-		80, 81, 82, 83, 84, 85, 86, 87,
-		88, 89, 90, 91, 92, 93, 94, 95,
-		96, 97, 98, 99, 100, 101, 102, 103,
-		104, 105, 106, 107, 108, 109, 110, 111,
-		112, 113, 114, 115, 116, 117, 118, 119,
-		120, 121, 122, 123, 124, 125, 126, 127,
-		128, 129, 130, 131, 132, 133, 134, 135,
-	},
-	.oobfree = { {2, 6}, {136, 208} },
-};
-
-/* 8192-byte page size with 8-bit ECC -- requires 218-byte OOB */
-static struct nand_ecclayout oob_8192_ecc8 = {
-	.eccbytes = 256,
-	.eccpos = {
-		8, 9, 10, 11, 12, 13, 14, 15,
-		16, 17, 18, 19, 20, 21, 22, 23,
-		24, 25, 26, 27, 28, 29, 30, 31,
-		32, 33, 34, 35, 36, 37, 38, 39,
-		40, 41, 42, 43, 44, 45, 46, 47,
-		48, 49, 50, 51, 52, 53, 54, 55,
-		56, 57, 58, 59, 60, 61, 62, 63,
-		64, 65, 66, 67, 68, 69, 70, 71,
-		72, 73, 74, 75, 76, 77, 78, 79,
-		80, 81, 82, 83, 84, 85, 86, 87,
-		88, 89, 90, 91, 92, 93, 94, 95,
-		96, 97, 98, 99, 100, 101, 102, 103,
-		104, 105, 106, 107, 108, 109, 110, 111,
-		112, 113, 114, 115, 116, 117, 118, 119,
-		120, 121, 122, 123, 124, 125, 126, 127,
-		128, 129, 130, 131, 132, 133, 134, 135,
-		136, 137, 138, 139, 140, 141, 142, 143,
-		144, 145, 146, 147, 148, 149, 150, 151,
-		152, 153, 154, 155, 156, 157, 158, 159,
-		160, 161, 162, 163, 164, 165, 166, 167,
-		168, 169, 170, 171, 172, 173, 174, 175,
-		176, 177, 178, 179, 180, 181, 182, 183,
-		184, 185, 186, 187, 188, 189, 190, 191,
-		192, 193, 194, 195, 196, 197, 198, 199,
-		200, 201, 202, 203, 204, 205, 206, 207,
-		208, 209, 210, 211, 212, 213, 214, 215,
-		216, 217, 218, 219, 220, 221, 222, 223,
-		224, 225, 226, 227, 228, 229, 230, 231,
-		232, 233, 234, 235, 236, 237, 238, 239,
-		240, 241, 242, 243, 244, 245, 246, 247,
-		248, 249, 250, 251, 252, 253, 254, 255,
-		256, 257, 258, 259, 260, 261, 262, 263,
-	},
-	.oobfree = { {2, 6}, {264, 80} },
-};
-
 /*
  * Generic flash bbt descriptors
  */
@@ -223,6 +93,57 @@ static struct nand_bbt_descr bbt_mirror_descr = {
 	.pattern = mirror_pattern,
 };
 
+static int fsl_ifc_ooblayout_ecc(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 8;
+	oobregion->length = chip->ecc.total;
+
+	return 0;
+}
+
+static int fsl_ifc_ooblayout_free(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section > 1)
+		return -ERANGE;
+
+	if (mtd->writesize == 512 &&
+	    !(chip->options & NAND_BUSWIDTH_16)) {
+		if (!section) {
+			oobregion->offset = 0;
+			oobregion->length = 5;
+		} else {
+			oobregion->offset = 6;
+			oobregion->length = 2;
+		}
+
+		return 0;
+	}
+
+	if (!section) {
+		oobregion->offset = 2;
+		oobregion->length = 6;
+	} else {
+		oobregion->offset = chip->ecc.total + 8;
+		oobregion->length = mtd->oobsize - oobregion->offset;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops fsl_ifc_ooblayout_ops = {
+	.ecc = fsl_ifc_ooblayout_ecc,
+	.free = fsl_ifc_ooblayout_free,
+};
+
 /*
  * Set up the IFC hardware block and page address fields, and the ifc nand
  * structure addr field to point to the correct IFC buffer in memory
@@ -812,8 +733,8 @@ static int fsl_ifc_chip_init_tail(struct mtd_info *mtd)
 							chip->ecc.bytes);
 	dev_dbg(priv->dev, "%s: nand->ecc.total = %d\n", __func__,
 							chip->ecc.total);
-	dev_dbg(priv->dev, "%s: nand->ecc.layout = %p\n", __func__,
-							chip->ecc.layout);
+	dev_dbg(priv->dev, "%s: mtd->ooblayout = %p\n", __func__,
+							mtd->ooblayout);
 	dev_dbg(priv->dev, "%s: mtd->flags = %08x\n", __func__, mtd->flags);
 	dev_dbg(priv->dev, "%s: mtd->size = %lld\n", __func__, mtd->size);
 	dev_dbg(priv->dev, "%s: mtd->erasesize = %d\n", __func__,
@@ -881,7 +802,6 @@ static int fsl_ifc_chip_init(struct fsl_ifc_mtd *priv)
 	struct fsl_ifc_regs __iomem *ifc = ctrl->regs;
 	struct nand_chip *chip = &priv->chip;
 	struct mtd_info *mtd = nand_to_mtd(&priv->chip);
-	struct nand_ecclayout *layout;
 	u32 csor;
 
 	/* Fill in fsl_ifc_mtd structure */
@@ -925,18 +845,9 @@ static int fsl_ifc_chip_init(struct fsl_ifc_mtd *priv)
 
 	csor = ifc_in32(&ifc->csor_cs[priv->bank].csor);
 
-	/* Hardware generates ECC per 512 Bytes */
-	chip->ecc.size = 512;
-	chip->ecc.bytes = 8;
-	chip->ecc.strength = 4;
-
 	switch (csor & CSOR_NAND_PGS_MASK) {
 	case CSOR_NAND_PGS_512:
-		if (chip->options & NAND_BUSWIDTH_16) {
-			layout = &oob_512_16bit_ecc4;
-		} else {
-			layout = &oob_512_8bit_ecc4;
-
+		if (!(chip->options & NAND_BUSWIDTH_16)) {
 			/* Avoid conflict with bad block marker */
 			bbt_main_descr.offs = 0;
 			bbt_mirror_descr.offs = 0;
@@ -946,35 +857,16 @@ static int fsl_ifc_chip_init(struct fsl_ifc_mtd *priv)
 		break;
 
 	case CSOR_NAND_PGS_2K:
-		layout = &oob_2048_ecc4;
 		priv->bufnum_mask = 3;
 		break;
 
 	case CSOR_NAND_PGS_4K:
-		if ((csor & CSOR_NAND_ECC_MODE_MASK) ==
-		    CSOR_NAND_ECC_MODE_4) {
-			layout = &oob_4096_ecc4;
-		} else {
-			layout = &oob_4096_ecc8;
-			chip->ecc.bytes = 16;
-			chip->ecc.strength = 8;
-		}
-
 		priv->bufnum_mask = 1;
 		break;
 
 	case CSOR_NAND_PGS_8K:
-		if ((csor & CSOR_NAND_ECC_MODE_MASK) ==
-		    CSOR_NAND_ECC_MODE_4) {
-			layout = &oob_8192_ecc4;
-		} else {
-			layout = &oob_8192_ecc8;
-			chip->ecc.bytes = 16;
-			chip->ecc.strength = 8;
-		}
-
 		priv->bufnum_mask = 0;
-	break;
+		break;
 
 	default:
 		dev_err(priv->dev, "bad csor %#x: bad page size\n", csor);
@@ -984,7 +876,17 @@ static int fsl_ifc_chip_init(struct fsl_ifc_mtd *priv)
 	/* Must also set CSOR_NAND_ECC_ENC_EN if DEC_EN set */
 	if (csor & CSOR_NAND_ECC_DEC_EN) {
 		chip->ecc.mode = NAND_ECC_HW;
-		chip->ecc.layout = layout;
+		mtd_set_ooblayout(mtd, &fsl_ifc_ooblayout_ops);
+
+		/* Hardware generates ECC per 512 Bytes */
+		chip->ecc.size = 512;
+		if ((csor & CSOR_NAND_ECC_MODE_MASK) == CSOR_NAND_ECC_MODE_4) {
+			chip->ecc.bytes = 8;
+			chip->ecc.strength = 4;
+		} else {
+			chip->ecc.bytes = 16;
+			chip->ecc.strength = 8;
+		}
 	} else {
 		chip->ecc.mode = NAND_ECC_SOFT;
 	}
-- 
2.5.0

[PATCH v5 32/50] mtd: nand: fsmc: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/fsmc_nand.c | 298 ++++++++++++-------------------------------
 1 file changed, 82 insertions(+), 216 deletions(-)

diff --git a/drivers/mtd/nand/fsmc_nand.c b/drivers/mtd/nand/fsmc_nand.c
index 1bdcd4f..275a98c 100644
--- a/drivers/mtd/nand/fsmc_nand.c
+++ b/drivers/mtd/nand/fsmc_nand.c
@@ -39,212 +39,6 @@
 #include <linux/amba/bus.h>
 #include <mtd/mtd-abi.h>
 
-static struct nand_ecclayout fsmc_ecc1_128_layout = {
-	.eccbytes = 24,
-	.eccpos = {2, 3, 4, 18, 19, 20, 34, 35, 36, 50, 51, 52,
-		66, 67, 68, 82, 83, 84, 98, 99, 100, 114, 115, 116},
-	.oobfree = {
-		{.offset = 8, .length = 8},
-		{.offset = 24, .length = 8},
-		{.offset = 40, .length = 8},
-		{.offset = 56, .length = 8},
-		{.offset = 72, .length = 8},
-		{.offset = 88, .length = 8},
-		{.offset = 104, .length = 8},
-		{.offset = 120, .length = 8}
-	}
-};
-
-static struct nand_ecclayout fsmc_ecc1_64_layout = {
-	.eccbytes = 12,
-	.eccpos = {2, 3, 4, 18, 19, 20, 34, 35, 36, 50, 51, 52},
-	.oobfree = {
-		{.offset = 8, .length = 8},
-		{.offset = 24, .length = 8},
-		{.offset = 40, .length = 8},
-		{.offset = 56, .length = 8},
-	}
-};
-
-static struct nand_ecclayout fsmc_ecc1_16_layout = {
-	.eccbytes = 3,
-	.eccpos = {2, 3, 4},
-	.oobfree = {
-		{.offset = 8, .length = 8},
-	}
-};
-
-/*
- * ECC4 layout for NAND of pagesize 8192 bytes & OOBsize 256 bytes. 13*16 bytes
- * of OB size is reserved for ECC, Byte no. 0 & 1 reserved for bad block and 46
- * bytes are free for use.
- */
-static struct nand_ecclayout fsmc_ecc4_256_layout = {
-	.eccbytes = 208,
-	.eccpos = {  2,   3,   4,   5,   6,   7,   8,
-		9,  10,  11,  12,  13,  14,
-		18,  19,  20,  21,  22,  23,  24,
-		25,  26,  27,  28,  29,  30,
-		34,  35,  36,  37,  38,  39,  40,
-		41,  42,  43,  44,  45,  46,
-		50,  51,  52,  53,  54,  55,  56,
-		57,  58,  59,  60,  61,  62,
-		66,  67,  68,  69,  70,  71,  72,
-		73,  74,  75,  76,  77,  78,
-		82,  83,  84,  85,  86,  87,  88,
-		89,  90,  91,  92,  93,  94,
-		98,  99, 100, 101, 102, 103, 104,
-		105, 106, 107, 108, 109, 110,
-		114, 115, 116, 117, 118, 119, 120,
-		121, 122, 123, 124, 125, 126,
-		130, 131, 132, 133, 134, 135, 136,
-		137, 138, 139, 140, 141, 142,
-		146, 147, 148, 149, 150, 151, 152,
-		153, 154, 155, 156, 157, 158,
-		162, 163, 164, 165, 166, 167, 168,
-		169, 170, 171, 172, 173, 174,
-		178, 179, 180, 181, 182, 183, 184,
-		185, 186, 187, 188, 189, 190,
-		194, 195, 196, 197, 198, 199, 200,
-		201, 202, 203, 204, 205, 206,
-		210, 211, 212, 213, 214, 215, 216,
-		217, 218, 219, 220, 221, 222,
-		226, 227, 228, 229, 230, 231, 232,
-		233, 234, 235, 236, 237, 238,
-		242, 243, 244, 245, 246, 247, 248,
-		249, 250, 251, 252, 253, 254
-	},
-	.oobfree = {
-		{.offset = 15, .length = 3},
-		{.offset = 31, .length = 3},
-		{.offset = 47, .length = 3},
-		{.offset = 63, .length = 3},
-		{.offset = 79, .length = 3},
-		{.offset = 95, .length = 3},
-		{.offset = 111, .length = 3},
-		{.offset = 127, .length = 3},
-		{.offset = 143, .length = 3},
-		{.offset = 159, .length = 3},
-		{.offset = 175, .length = 3},
-		{.offset = 191, .length = 3},
-		{.offset = 207, .length = 3},
-		{.offset = 223, .length = 3},
-		{.offset = 239, .length = 3},
-		{.offset = 255, .length = 1}
-	}
-};
-
-/*
- * ECC4 layout for NAND of pagesize 4096 bytes & OOBsize 224 bytes. 13*8 bytes
- * of OOB size is reserved for ECC, Byte no. 0 & 1 reserved for bad block & 118
- * bytes are free for use.
- */
-static struct nand_ecclayout fsmc_ecc4_224_layout = {
-	.eccbytes = 104,
-	.eccpos = {  2,   3,   4,   5,   6,   7,   8,
-		9,  10,  11,  12,  13,  14,
-		18,  19,  20,  21,  22,  23,  24,
-		25,  26,  27,  28,  29,  30,
-		34,  35,  36,  37,  38,  39,  40,
-		41,  42,  43,  44,  45,  46,
-		50,  51,  52,  53,  54,  55,  56,
-		57,  58,  59,  60,  61,  62,
-		66,  67,  68,  69,  70,  71,  72,
-		73,  74,  75,  76,  77,  78,
-		82,  83,  84,  85,  86,  87,  88,
-		89,  90,  91,  92,  93,  94,
-		98,  99, 100, 101, 102, 103, 104,
-		105, 106, 107, 108, 109, 110,
-		114, 115, 116, 117, 118, 119, 120,
-		121, 122, 123, 124, 125, 126
-	},
-	.oobfree = {
-		{.offset = 15, .length = 3},
-		{.offset = 31, .length = 3},
-		{.offset = 47, .length = 3},
-		{.offset = 63, .length = 3},
-		{.offset = 79, .length = 3},
-		{.offset = 95, .length = 3},
-		{.offset = 111, .length = 3},
-		{.offset = 127, .length = 97}
-	}
-};
-
-/*
- * ECC4 layout for NAND of pagesize 4096 bytes & OOBsize 128 bytes. 13*8 bytes
- * of OOB size is reserved for ECC, Byte no. 0 & 1 reserved for bad block & 22
- * bytes are free for use.
- */
-static struct nand_ecclayout fsmc_ecc4_128_layout = {
-	.eccbytes = 104,
-	.eccpos = {  2,   3,   4,   5,   6,   7,   8,
-		9,  10,  11,  12,  13,  14,
-		18,  19,  20,  21,  22,  23,  24,
-		25,  26,  27,  28,  29,  30,
-		34,  35,  36,  37,  38,  39,  40,
-		41,  42,  43,  44,  45,  46,
-		50,  51,  52,  53,  54,  55,  56,
-		57,  58,  59,  60,  61,  62,
-		66,  67,  68,  69,  70,  71,  72,
-		73,  74,  75,  76,  77,  78,
-		82,  83,  84,  85,  86,  87,  88,
-		89,  90,  91,  92,  93,  94,
-		98,  99, 100, 101, 102, 103, 104,
-		105, 106, 107, 108, 109, 110,
-		114, 115, 116, 117, 118, 119, 120,
-		121, 122, 123, 124, 125, 126
-	},
-	.oobfree = {
-		{.offset = 15, .length = 3},
-		{.offset = 31, .length = 3},
-		{.offset = 47, .length = 3},
-		{.offset = 63, .length = 3},
-		{.offset = 79, .length = 3},
-		{.offset = 95, .length = 3},
-		{.offset = 111, .length = 3},
-		{.offset = 127, .length = 1}
-	}
-};
-
-/*
- * ECC4 layout for NAND of pagesize 2048 bytes & OOBsize 64 bytes. 13*4 bytes of
- * OOB size is reserved for ECC, Byte no. 0 & 1 reserved for bad block and 10
- * bytes are free for use.
- */
-static struct nand_ecclayout fsmc_ecc4_64_layout = {
-	.eccbytes = 52,
-	.eccpos = {  2,   3,   4,   5,   6,   7,   8,
-		9,  10,  11,  12,  13,  14,
-		18,  19,  20,  21,  22,  23,  24,
-		25,  26,  27,  28,  29,  30,
-		34,  35,  36,  37,  38,  39,  40,
-		41,  42,  43,  44,  45,  46,
-		50,  51,  52,  53,  54,  55,  56,
-		57,  58,  59,  60,  61,  62,
-	},
-	.oobfree = {
-		{.offset = 15, .length = 3},
-		{.offset = 31, .length = 3},
-		{.offset = 47, .length = 3},
-		{.offset = 63, .length = 1},
-	}
-};
-
-/*
- * ECC4 layout for NAND of pagesize 512 bytes & OOBsize 16 bytes. 13 bytes of
- * OOB size is reserved for ECC, Byte no. 4 & 5 reserved for bad block and One
- * byte is free for use.
- */
-static struct nand_ecclayout fsmc_ecc4_16_layout = {
-	.eccbytes = 13,
-	.eccpos = { 0,  1,  2,  3,  6,  7, 8,
-		9, 10, 11, 12, 13, 14
-	},
-	.oobfree = {
-		{.offset = 15, .length = 1},
-	}
-};
-
 /*
  * ECC placement definitions in oobfree type format.
  * There are 13 bytes of ecc for every 512 byte block and it has to be read
@@ -274,6 +68,84 @@ static struct fsmc_eccplace fsmc_ecc4_sp_place = {
 	}
 };
 
+static int fsmc_ecc1_ooblayout_ecc(struct mtd_info *mtd, int section,
+				   struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section >= chip->ecc.steps)
+		return -ERANGE;
+
+	oobregion->offset = (section * 16) + 2;
+	oobregion->length = 3;
+
+	return 0;
+}
+
+static int fsmc_ecc1_ooblayout_free(struct mtd_info *mtd, int section,
+				    struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section >= chip->ecc.steps)
+		return -ERANGE;
+
+	oobregion->offset = (section * 16) + 8;
+
+	if (section < chip->ecc.steps - 1)
+		oobregion->length = 8;
+	else
+		oobregion->length = mtd->oobsize - oobregion->offset;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops fsmc_ecc1_ooblayout_ops = {
+	.ecc = fsmc_ecc1_ooblayout_ecc,
+	.free = fsmc_ecc1_ooblayout_free,
+};
+
+static int fsmc_ecc4_ooblayout_ecc(struct mtd_info *mtd, int section,
+				   struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section >= chip->ecc.steps)
+		return -ERANGE;
+
+	oobregion->length = chip->ecc.bytes;
+
+	if (!section && mtd->writesize <= 512)
+		oobregion->offset = 0;
+	else
+		oobregion->offset = (section * 16) + 2;
+
+	return 0;
+}
+
+static int fsmc_ecc4_ooblayout_free(struct mtd_info *mtd, int section,
+				    struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section >= chip->ecc.steps)
+		return -ERANGE;
+
+	oobregion->offset = (section * 16) + 15;
+
+	if (section < chip->ecc.steps - 1)
+		oobregion->length = 3;
+	else
+		oobregion->length = mtd->oobsize - oobregion->offset;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops fsmc_ecc4_ooblayout_ops = {
+	.ecc = fsmc_ecc4_ooblayout_ecc,
+	.free = fsmc_ecc4_ooblayout_free,
+};
+
 /**
  * struct fsmc_nand_data - structure for FSMC NAND device state
  *
@@ -1084,23 +956,18 @@ static int __init fsmc_nand_probe(struct platform_device *pdev)
 	if (AMBA_REV_BITS(host->pid) >= 8) {
 		switch (mtd->oobsize) {
 		case 16:
-			nand->ecc.layout = &fsmc_ecc4_16_layout;
 			host->ecc_place = &fsmc_ecc4_sp_place;
 			break;
 		case 64:
-			nand->ecc.layout = &fsmc_ecc4_64_layout;
 			host->ecc_place = &fsmc_ecc4_lp_place;
 			break;
 		case 128:
-			nand->ecc.layout = &fsmc_ecc4_128_layout;
 			host->ecc_place = &fsmc_ecc4_lp_place;
 			break;
 		case 224:
-			nand->ecc.layout = &fsmc_ecc4_224_layout;
 			host->ecc_place = &fsmc_ecc4_lp_place;
 			break;
 		case 256:
-			nand->ecc.layout = &fsmc_ecc4_256_layout;
 			host->ecc_place = &fsmc_ecc4_lp_place;
 			break;
 		default:
@@ -1109,6 +976,8 @@ static int __init fsmc_nand_probe(struct platform_device *pdev)
 			ret = -EINVAL;
 			goto err_probe;
 		}
+
+		mtd_set_ooblayout(mtd, &fsmc_ecc4_ooblayout_ops);
 	} else {
 		switch (nand->ecc.mode) {
 		case NAND_ECC_HW:
@@ -1135,13 +1004,10 @@ static int __init fsmc_nand_probe(struct platform_device *pdev)
 		if (nand->ecc.mode != NAND_ECC_SOFT_BCH) {
 			switch (mtd->oobsize) {
 			case 16:
-				nand->ecc.layout = &fsmc_ecc1_16_layout;
-				break;
 			case 64:
-				nand->ecc.layout = &fsmc_ecc1_64_layout;
-				break;
 			case 128:
-				nand->ecc.layout = &fsmc_ecc1_128_layout;
+				mtd_set_ooblayout(mtd,
+						  &fsmc_ecc1_ooblayout_ops);
 				break;
 			default:
 				dev_warn(&pdev->dev,
-- 
2.5.0

[PATCH v5 32/50] mtd: nand: fsmc: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/mtd/nand/fsmc_nand.c | 298 ++++++++++++-------------------------------
 1 file changed, 82 insertions(+), 216 deletions(-)

diff --git a/drivers/mtd/nand/fsmc_nand.c b/drivers/mtd/nand/fsmc_nand.c
index 1bdcd4f..275a98c 100644
--- a/drivers/mtd/nand/fsmc_nand.c
+++ b/drivers/mtd/nand/fsmc_nand.c
@@ -39,212 +39,6 @@
 #include <linux/amba/bus.h>
 #include <mtd/mtd-abi.h>
 
-static struct nand_ecclayout fsmc_ecc1_128_layout = {
-	.eccbytes = 24,
-	.eccpos = {2, 3, 4, 18, 19, 20, 34, 35, 36, 50, 51, 52,
-		66, 67, 68, 82, 83, 84, 98, 99, 100, 114, 115, 116},
-	.oobfree = {
-		{.offset = 8, .length = 8},
-		{.offset = 24, .length = 8},
-		{.offset = 40, .length = 8},
-		{.offset = 56, .length = 8},
-		{.offset = 72, .length = 8},
-		{.offset = 88, .length = 8},
-		{.offset = 104, .length = 8},
-		{.offset = 120, .length = 8}
-	}
-};
-
-static struct nand_ecclayout fsmc_ecc1_64_layout = {
-	.eccbytes = 12,
-	.eccpos = {2, 3, 4, 18, 19, 20, 34, 35, 36, 50, 51, 52},
-	.oobfree = {
-		{.offset = 8, .length = 8},
-		{.offset = 24, .length = 8},
-		{.offset = 40, .length = 8},
-		{.offset = 56, .length = 8},
-	}
-};
-
-static struct nand_ecclayout fsmc_ecc1_16_layout = {
-	.eccbytes = 3,
-	.eccpos = {2, 3, 4},
-	.oobfree = {
-		{.offset = 8, .length = 8},
-	}
-};
-
-/*
- * ECC4 layout for NAND of pagesize 8192 bytes & OOBsize 256 bytes. 13*16 bytes
- * of OB size is reserved for ECC, Byte no. 0 & 1 reserved for bad block and 46
- * bytes are free for use.
- */
-static struct nand_ecclayout fsmc_ecc4_256_layout = {
-	.eccbytes = 208,
-	.eccpos = {  2,   3,   4,   5,   6,   7,   8,
-		9,  10,  11,  12,  13,  14,
-		18,  19,  20,  21,  22,  23,  24,
-		25,  26,  27,  28,  29,  30,
-		34,  35,  36,  37,  38,  39,  40,
-		41,  42,  43,  44,  45,  46,
-		50,  51,  52,  53,  54,  55,  56,
-		57,  58,  59,  60,  61,  62,
-		66,  67,  68,  69,  70,  71,  72,
-		73,  74,  75,  76,  77,  78,
-		82,  83,  84,  85,  86,  87,  88,
-		89,  90,  91,  92,  93,  94,
-		98,  99, 100, 101, 102, 103, 104,
-		105, 106, 107, 108, 109, 110,
-		114, 115, 116, 117, 118, 119, 120,
-		121, 122, 123, 124, 125, 126,
-		130, 131, 132, 133, 134, 135, 136,
-		137, 138, 139, 140, 141, 142,
-		146, 147, 148, 149, 150, 151, 152,
-		153, 154, 155, 156, 157, 158,
-		162, 163, 164, 165, 166, 167, 168,
-		169, 170, 171, 172, 173, 174,
-		178, 179, 180, 181, 182, 183, 184,
-		185, 186, 187, 188, 189, 190,
-		194, 195, 196, 197, 198, 199, 200,
-		201, 202, 203, 204, 205, 206,
-		210, 211, 212, 213, 214, 215, 216,
-		217, 218, 219, 220, 221, 222,
-		226, 227, 228, 229, 230, 231, 232,
-		233, 234, 235, 236, 237, 238,
-		242, 243, 244, 245, 246, 247, 248,
-		249, 250, 251, 252, 253, 254
-	},
-	.oobfree = {
-		{.offset = 15, .length = 3},
-		{.offset = 31, .length = 3},
-		{.offset = 47, .length = 3},
-		{.offset = 63, .length = 3},
-		{.offset = 79, .length = 3},
-		{.offset = 95, .length = 3},
-		{.offset = 111, .length = 3},
-		{.offset = 127, .length = 3},
-		{.offset = 143, .length = 3},
-		{.offset = 159, .length = 3},
-		{.offset = 175, .length = 3},
-		{.offset = 191, .length = 3},
-		{.offset = 207, .length = 3},
-		{.offset = 223, .length = 3},
-		{.offset = 239, .length = 3},
-		{.offset = 255, .length = 1}
-	}
-};
-
-/*
- * ECC4 layout for NAND of pagesize 4096 bytes & OOBsize 224 bytes. 13*8 bytes
- * of OOB size is reserved for ECC, Byte no. 0 & 1 reserved for bad block & 118
- * bytes are free for use.
- */
-static struct nand_ecclayout fsmc_ecc4_224_layout = {
-	.eccbytes = 104,
-	.eccpos = {  2,   3,   4,   5,   6,   7,   8,
-		9,  10,  11,  12,  13,  14,
-		18,  19,  20,  21,  22,  23,  24,
-		25,  26,  27,  28,  29,  30,
-		34,  35,  36,  37,  38,  39,  40,
-		41,  42,  43,  44,  45,  46,
-		50,  51,  52,  53,  54,  55,  56,
-		57,  58,  59,  60,  61,  62,
-		66,  67,  68,  69,  70,  71,  72,
-		73,  74,  75,  76,  77,  78,
-		82,  83,  84,  85,  86,  87,  88,
-		89,  90,  91,  92,  93,  94,
-		98,  99, 100, 101, 102, 103, 104,
-		105, 106, 107, 108, 109, 110,
-		114, 115, 116, 117, 118, 119, 120,
-		121, 122, 123, 124, 125, 126
-	},
-	.oobfree = {
-		{.offset = 15, .length = 3},
-		{.offset = 31, .length = 3},
-		{.offset = 47, .length = 3},
-		{.offset = 63, .length = 3},
-		{.offset = 79, .length = 3},
-		{.offset = 95, .length = 3},
-		{.offset = 111, .length = 3},
-		{.offset = 127, .length = 97}
-	}
-};
-
-/*
- * ECC4 layout for NAND of pagesize 4096 bytes & OOBsize 128 bytes. 13*8 bytes
- * of OOB size is reserved for ECC, Byte no. 0 & 1 reserved for bad block & 22
- * bytes are free for use.
- */
-static struct nand_ecclayout fsmc_ecc4_128_layout = {
-	.eccbytes = 104,
-	.eccpos = {  2,   3,   4,   5,   6,   7,   8,
-		9,  10,  11,  12,  13,  14,
-		18,  19,  20,  21,  22,  23,  24,
-		25,  26,  27,  28,  29,  30,
-		34,  35,  36,  37,  38,  39,  40,
-		41,  42,  43,  44,  45,  46,
-		50,  51,  52,  53,  54,  55,  56,
-		57,  58,  59,  60,  61,  62,
-		66,  67,  68,  69,  70,  71,  72,
-		73,  74,  75,  76,  77,  78,
-		82,  83,  84,  85,  86,  87,  88,
-		89,  90,  91,  92,  93,  94,
-		98,  99, 100, 101, 102, 103, 104,
-		105, 106, 107, 108, 109, 110,
-		114, 115, 116, 117, 118, 119, 120,
-		121, 122, 123, 124, 125, 126
-	},
-	.oobfree = {
-		{.offset = 15, .length = 3},
-		{.offset = 31, .length = 3},
-		{.offset = 47, .length = 3},
-		{.offset = 63, .length = 3},
-		{.offset = 79, .length = 3},
-		{.offset = 95, .length = 3},
-		{.offset = 111, .length = 3},
-		{.offset = 127, .length = 1}
-	}
-};
-
-/*
- * ECC4 layout for NAND of pagesize 2048 bytes & OOBsize 64 bytes. 13*4 bytes of
- * OOB size is reserved for ECC, Byte no. 0 & 1 reserved for bad block and 10
- * bytes are free for use.
- */
-static struct nand_ecclayout fsmc_ecc4_64_layout = {
-	.eccbytes = 52,
-	.eccpos = {  2,   3,   4,   5,   6,   7,   8,
-		9,  10,  11,  12,  13,  14,
-		18,  19,  20,  21,  22,  23,  24,
-		25,  26,  27,  28,  29,  30,
-		34,  35,  36,  37,  38,  39,  40,
-		41,  42,  43,  44,  45,  46,
-		50,  51,  52,  53,  54,  55,  56,
-		57,  58,  59,  60,  61,  62,
-	},
-	.oobfree = {
-		{.offset = 15, .length = 3},
-		{.offset = 31, .length = 3},
-		{.offset = 47, .length = 3},
-		{.offset = 63, .length = 1},
-	}
-};
-
-/*
- * ECC4 layout for NAND of pagesize 512 bytes & OOBsize 16 bytes. 13 bytes of
- * OOB size is reserved for ECC, Byte no. 4 & 5 reserved for bad block and One
- * byte is free for use.
- */
-static struct nand_ecclayout fsmc_ecc4_16_layout = {
-	.eccbytes = 13,
-	.eccpos = { 0,  1,  2,  3,  6,  7, 8,
-		9, 10, 11, 12, 13, 14
-	},
-	.oobfree = {
-		{.offset = 15, .length = 1},
-	}
-};
-
 /*
  * ECC placement definitions in oobfree type format.
  * There are 13 bytes of ecc for every 512 byte block and it has to be read
@@ -274,6 +68,84 @@ static struct fsmc_eccplace fsmc_ecc4_sp_place = {
 	}
 };
 
+static int fsmc_ecc1_ooblayout_ecc(struct mtd_info *mtd, int section,
+				   struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section >= chip->ecc.steps)
+		return -ERANGE;
+
+	oobregion->offset = (section * 16) + 2;
+	oobregion->length = 3;
+
+	return 0;
+}
+
+static int fsmc_ecc1_ooblayout_free(struct mtd_info *mtd, int section,
+				    struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section >= chip->ecc.steps)
+		return -ERANGE;
+
+	oobregion->offset = (section * 16) + 8;
+
+	if (section < chip->ecc.steps - 1)
+		oobregion->length = 8;
+	else
+		oobregion->length = mtd->oobsize - oobregion->offset;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops fsmc_ecc1_ooblayout_ops = {
+	.ecc = fsmc_ecc1_ooblayout_ecc,
+	.free = fsmc_ecc1_ooblayout_free,
+};
+
+static int fsmc_ecc4_ooblayout_ecc(struct mtd_info *mtd, int section,
+				   struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section >= chip->ecc.steps)
+		return -ERANGE;
+
+	oobregion->length = chip->ecc.bytes;
+
+	if (!section && mtd->writesize <= 512)
+		oobregion->offset = 0;
+	else
+		oobregion->offset = (section * 16) + 2;
+
+	return 0;
+}
+
+static int fsmc_ecc4_ooblayout_free(struct mtd_info *mtd, int section,
+				    struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section >= chip->ecc.steps)
+		return -ERANGE;
+
+	oobregion->offset = (section * 16) + 15;
+
+	if (section < chip->ecc.steps - 1)
+		oobregion->length = 3;
+	else
+		oobregion->length = mtd->oobsize - oobregion->offset;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops fsmc_ecc4_ooblayout_ops = {
+	.ecc = fsmc_ecc4_ooblayout_ecc,
+	.free = fsmc_ecc4_ooblayout_free,
+};
+
 /**
  * struct fsmc_nand_data - structure for FSMC NAND device state
  *
@@ -1084,23 +956,18 @@ static int __init fsmc_nand_probe(struct platform_device *pdev)
 	if (AMBA_REV_BITS(host->pid) >= 8) {
 		switch (mtd->oobsize) {
 		case 16:
-			nand->ecc.layout = &fsmc_ecc4_16_layout;
 			host->ecc_place = &fsmc_ecc4_sp_place;
 			break;
 		case 64:
-			nand->ecc.layout = &fsmc_ecc4_64_layout;
 			host->ecc_place = &fsmc_ecc4_lp_place;
 			break;
 		case 128:
-			nand->ecc.layout = &fsmc_ecc4_128_layout;
 			host->ecc_place = &fsmc_ecc4_lp_place;
 			break;
 		case 224:
-			nand->ecc.layout = &fsmc_ecc4_224_layout;
 			host->ecc_place = &fsmc_ecc4_lp_place;
 			break;
 		case 256:
-			nand->ecc.layout = &fsmc_ecc4_256_layout;
 			host->ecc_place = &fsmc_ecc4_lp_place;
 			break;
 		default:
@@ -1109,6 +976,8 @@ static int __init fsmc_nand_probe(struct platform_device *pdev)
 			ret = -EINVAL;
 			goto err_probe;
 		}
+
+		mtd_set_ooblayout(mtd, &fsmc_ecc4_ooblayout_ops);
 	} else {
 		switch (nand->ecc.mode) {
 		case NAND_ECC_HW:
@@ -1135,13 +1004,10 @@ static int __init fsmc_nand_probe(struct platform_device *pdev)
 		if (nand->ecc.mode != NAND_ECC_SOFT_BCH) {
 			switch (mtd->oobsize) {
 			case 16:
-				nand->ecc.layout = &fsmc_ecc1_16_layout;
-				break;
 			case 64:
-				nand->ecc.layout = &fsmc_ecc1_64_layout;
-				break;
 			case 128:
-				nand->ecc.layout = &fsmc_ecc1_128_layout;
+				mtd_set_ooblayout(mtd,
+						  &fsmc_ecc1_ooblayout_ops);
 				break;
 			default:
 				dev_warn(&pdev->dev,
-- 
2.5.0

[PATCH v5 32/50] mtd: nand: fsmc: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/fsmc_nand.c | 298 ++++++++++++-------------------------------
 1 file changed, 82 insertions(+), 216 deletions(-)

diff --git a/drivers/mtd/nand/fsmc_nand.c b/drivers/mtd/nand/fsmc_nand.c
index 1bdcd4f..275a98c 100644
--- a/drivers/mtd/nand/fsmc_nand.c
+++ b/drivers/mtd/nand/fsmc_nand.c
@@ -39,212 +39,6 @@
 #include <linux/amba/bus.h>
 #include <mtd/mtd-abi.h>
 
-static struct nand_ecclayout fsmc_ecc1_128_layout = {
-	.eccbytes = 24,
-	.eccpos = {2, 3, 4, 18, 19, 20, 34, 35, 36, 50, 51, 52,
-		66, 67, 68, 82, 83, 84, 98, 99, 100, 114, 115, 116},
-	.oobfree = {
-		{.offset = 8, .length = 8},
-		{.offset = 24, .length = 8},
-		{.offset = 40, .length = 8},
-		{.offset = 56, .length = 8},
-		{.offset = 72, .length = 8},
-		{.offset = 88, .length = 8},
-		{.offset = 104, .length = 8},
-		{.offset = 120, .length = 8}
-	}
-};
-
-static struct nand_ecclayout fsmc_ecc1_64_layout = {
-	.eccbytes = 12,
-	.eccpos = {2, 3, 4, 18, 19, 20, 34, 35, 36, 50, 51, 52},
-	.oobfree = {
-		{.offset = 8, .length = 8},
-		{.offset = 24, .length = 8},
-		{.offset = 40, .length = 8},
-		{.offset = 56, .length = 8},
-	}
-};
-
-static struct nand_ecclayout fsmc_ecc1_16_layout = {
-	.eccbytes = 3,
-	.eccpos = {2, 3, 4},
-	.oobfree = {
-		{.offset = 8, .length = 8},
-	}
-};
-
-/*
- * ECC4 layout for NAND of pagesize 8192 bytes & OOBsize 256 bytes. 13*16 bytes
- * of OB size is reserved for ECC, Byte no. 0 & 1 reserved for bad block and 46
- * bytes are free for use.
- */
-static struct nand_ecclayout fsmc_ecc4_256_layout = {
-	.eccbytes = 208,
-	.eccpos = {  2,   3,   4,   5,   6,   7,   8,
-		9,  10,  11,  12,  13,  14,
-		18,  19,  20,  21,  22,  23,  24,
-		25,  26,  27,  28,  29,  30,
-		34,  35,  36,  37,  38,  39,  40,
-		41,  42,  43,  44,  45,  46,
-		50,  51,  52,  53,  54,  55,  56,
-		57,  58,  59,  60,  61,  62,
-		66,  67,  68,  69,  70,  71,  72,
-		73,  74,  75,  76,  77,  78,
-		82,  83,  84,  85,  86,  87,  88,
-		89,  90,  91,  92,  93,  94,
-		98,  99, 100, 101, 102, 103, 104,
-		105, 106, 107, 108, 109, 110,
-		114, 115, 116, 117, 118, 119, 120,
-		121, 122, 123, 124, 125, 126,
-		130, 131, 132, 133, 134, 135, 136,
-		137, 138, 139, 140, 141, 142,
-		146, 147, 148, 149, 150, 151, 152,
-		153, 154, 155, 156, 157, 158,
-		162, 163, 164, 165, 166, 167, 168,
-		169, 170, 171, 172, 173, 174,
-		178, 179, 180, 181, 182, 183, 184,
-		185, 186, 187, 188, 189, 190,
-		194, 195, 196, 197, 198, 199, 200,
-		201, 202, 203, 204, 205, 206,
-		210, 211, 212, 213, 214, 215, 216,
-		217, 218, 219, 220, 221, 222,
-		226, 227, 228, 229, 230, 231, 232,
-		233, 234, 235, 236, 237, 238,
-		242, 243, 244, 245, 246, 247, 248,
-		249, 250, 251, 252, 253, 254
-	},
-	.oobfree = {
-		{.offset = 15, .length = 3},
-		{.offset = 31, .length = 3},
-		{.offset = 47, .length = 3},
-		{.offset = 63, .length = 3},
-		{.offset = 79, .length = 3},
-		{.offset = 95, .length = 3},
-		{.offset = 111, .length = 3},
-		{.offset = 127, .length = 3},
-		{.offset = 143, .length = 3},
-		{.offset = 159, .length = 3},
-		{.offset = 175, .length = 3},
-		{.offset = 191, .length = 3},
-		{.offset = 207, .length = 3},
-		{.offset = 223, .length = 3},
-		{.offset = 239, .length = 3},
-		{.offset = 255, .length = 1}
-	}
-};
-
-/*
- * ECC4 layout for NAND of pagesize 4096 bytes & OOBsize 224 bytes. 13*8 bytes
- * of OOB size is reserved for ECC, Byte no. 0 & 1 reserved for bad block & 118
- * bytes are free for use.
- */
-static struct nand_ecclayout fsmc_ecc4_224_layout = {
-	.eccbytes = 104,
-	.eccpos = {  2,   3,   4,   5,   6,   7,   8,
-		9,  10,  11,  12,  13,  14,
-		18,  19,  20,  21,  22,  23,  24,
-		25,  26,  27,  28,  29,  30,
-		34,  35,  36,  37,  38,  39,  40,
-		41,  42,  43,  44,  45,  46,
-		50,  51,  52,  53,  54,  55,  56,
-		57,  58,  59,  60,  61,  62,
-		66,  67,  68,  69,  70,  71,  72,
-		73,  74,  75,  76,  77,  78,
-		82,  83,  84,  85,  86,  87,  88,
-		89,  90,  91,  92,  93,  94,
-		98,  99, 100, 101, 102, 103, 104,
-		105, 106, 107, 108, 109, 110,
-		114, 115, 116, 117, 118, 119, 120,
-		121, 122, 123, 124, 125, 126
-	},
-	.oobfree = {
-		{.offset = 15, .length = 3},
-		{.offset = 31, .length = 3},
-		{.offset = 47, .length = 3},
-		{.offset = 63, .length = 3},
-		{.offset = 79, .length = 3},
-		{.offset = 95, .length = 3},
-		{.offset = 111, .length = 3},
-		{.offset = 127, .length = 97}
-	}
-};
-
-/*
- * ECC4 layout for NAND of pagesize 4096 bytes & OOBsize 128 bytes. 13*8 bytes
- * of OOB size is reserved for ECC, Byte no. 0 & 1 reserved for bad block & 22
- * bytes are free for use.
- */
-static struct nand_ecclayout fsmc_ecc4_128_layout = {
-	.eccbytes = 104,
-	.eccpos = {  2,   3,   4,   5,   6,   7,   8,
-		9,  10,  11,  12,  13,  14,
-		18,  19,  20,  21,  22,  23,  24,
-		25,  26,  27,  28,  29,  30,
-		34,  35,  36,  37,  38,  39,  40,
-		41,  42,  43,  44,  45,  46,
-		50,  51,  52,  53,  54,  55,  56,
-		57,  58,  59,  60,  61,  62,
-		66,  67,  68,  69,  70,  71,  72,
-		73,  74,  75,  76,  77,  78,
-		82,  83,  84,  85,  86,  87,  88,
-		89,  90,  91,  92,  93,  94,
-		98,  99, 100, 101, 102, 103, 104,
-		105, 106, 107, 108, 109, 110,
-		114, 115, 116, 117, 118, 119, 120,
-		121, 122, 123, 124, 125, 126
-	},
-	.oobfree = {
-		{.offset = 15, .length = 3},
-		{.offset = 31, .length = 3},
-		{.offset = 47, .length = 3},
-		{.offset = 63, .length = 3},
-		{.offset = 79, .length = 3},
-		{.offset = 95, .length = 3},
-		{.offset = 111, .length = 3},
-		{.offset = 127, .length = 1}
-	}
-};
-
-/*
- * ECC4 layout for NAND of pagesize 2048 bytes & OOBsize 64 bytes. 13*4 bytes of
- * OOB size is reserved for ECC, Byte no. 0 & 1 reserved for bad block and 10
- * bytes are free for use.
- */
-static struct nand_ecclayout fsmc_ecc4_64_layout = {
-	.eccbytes = 52,
-	.eccpos = {  2,   3,   4,   5,   6,   7,   8,
-		9,  10,  11,  12,  13,  14,
-		18,  19,  20,  21,  22,  23,  24,
-		25,  26,  27,  28,  29,  30,
-		34,  35,  36,  37,  38,  39,  40,
-		41,  42,  43,  44,  45,  46,
-		50,  51,  52,  53,  54,  55,  56,
-		57,  58,  59,  60,  61,  62,
-	},
-	.oobfree = {
-		{.offset = 15, .length = 3},
-		{.offset = 31, .length = 3},
-		{.offset = 47, .length = 3},
-		{.offset = 63, .length = 1},
-	}
-};
-
-/*
- * ECC4 layout for NAND of pagesize 512 bytes & OOBsize 16 bytes. 13 bytes of
- * OOB size is reserved for ECC, Byte no. 4 & 5 reserved for bad block and One
- * byte is free for use.
- */
-static struct nand_ecclayout fsmc_ecc4_16_layout = {
-	.eccbytes = 13,
-	.eccpos = { 0,  1,  2,  3,  6,  7, 8,
-		9, 10, 11, 12, 13, 14
-	},
-	.oobfree = {
-		{.offset = 15, .length = 1},
-	}
-};
-
 /*
  * ECC placement definitions in oobfree type format.
  * There are 13 bytes of ecc for every 512 byte block and it has to be read
@@ -274,6 +68,84 @@ static struct fsmc_eccplace fsmc_ecc4_sp_place = {
 	}
 };
 
+static int fsmc_ecc1_ooblayout_ecc(struct mtd_info *mtd, int section,
+				   struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section >= chip->ecc.steps)
+		return -ERANGE;
+
+	oobregion->offset = (section * 16) + 2;
+	oobregion->length = 3;
+
+	return 0;
+}
+
+static int fsmc_ecc1_ooblayout_free(struct mtd_info *mtd, int section,
+				    struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section >= chip->ecc.steps)
+		return -ERANGE;
+
+	oobregion->offset = (section * 16) + 8;
+
+	if (section < chip->ecc.steps - 1)
+		oobregion->length = 8;
+	else
+		oobregion->length = mtd->oobsize - oobregion->offset;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops fsmc_ecc1_ooblayout_ops = {
+	.ecc = fsmc_ecc1_ooblayout_ecc,
+	.free = fsmc_ecc1_ooblayout_free,
+};
+
+static int fsmc_ecc4_ooblayout_ecc(struct mtd_info *mtd, int section,
+				   struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section >= chip->ecc.steps)
+		return -ERANGE;
+
+	oobregion->length = chip->ecc.bytes;
+
+	if (!section && mtd->writesize <= 512)
+		oobregion->offset = 0;
+	else
+		oobregion->offset = (section * 16) + 2;
+
+	return 0;
+}
+
+static int fsmc_ecc4_ooblayout_free(struct mtd_info *mtd, int section,
+				    struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section >= chip->ecc.steps)
+		return -ERANGE;
+
+	oobregion->offset = (section * 16) + 15;
+
+	if (section < chip->ecc.steps - 1)
+		oobregion->length = 3;
+	else
+		oobregion->length = mtd->oobsize - oobregion->offset;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops fsmc_ecc4_ooblayout_ops = {
+	.ecc = fsmc_ecc4_ooblayout_ecc,
+	.free = fsmc_ecc4_ooblayout_free,
+};
+
 /**
  * struct fsmc_nand_data - structure for FSMC NAND device state
  *
@@ -1084,23 +956,18 @@ static int __init fsmc_nand_probe(struct platform_device *pdev)
 	if (AMBA_REV_BITS(host->pid) >= 8) {
 		switch (mtd->oobsize) {
 		case 16:
-			nand->ecc.layout = &fsmc_ecc4_16_layout;
 			host->ecc_place = &fsmc_ecc4_sp_place;
 			break;
 		case 64:
-			nand->ecc.layout = &fsmc_ecc4_64_layout;
 			host->ecc_place = &fsmc_ecc4_lp_place;
 			break;
 		case 128:
-			nand->ecc.layout = &fsmc_ecc4_128_layout;
 			host->ecc_place = &fsmc_ecc4_lp_place;
 			break;
 		case 224:
-			nand->ecc.layout = &fsmc_ecc4_224_layout;
 			host->ecc_place = &fsmc_ecc4_lp_place;
 			break;
 		case 256:
-			nand->ecc.layout = &fsmc_ecc4_256_layout;
 			host->ecc_place = &fsmc_ecc4_lp_place;
 			break;
 		default:
@@ -1109,6 +976,8 @@ static int __init fsmc_nand_probe(struct platform_device *pdev)
 			ret = -EINVAL;
 			goto err_probe;
 		}
+
+		mtd_set_ooblayout(mtd, &fsmc_ecc4_ooblayout_ops);
 	} else {
 		switch (nand->ecc.mode) {
 		case NAND_ECC_HW:
@@ -1135,13 +1004,10 @@ static int __init fsmc_nand_probe(struct platform_device *pdev)
 		if (nand->ecc.mode != NAND_ECC_SOFT_BCH) {
 			switch (mtd->oobsize) {
 			case 16:
-				nand->ecc.layout = &fsmc_ecc1_16_layout;
-				break;
 			case 64:
-				nand->ecc.layout = &fsmc_ecc1_64_layout;
-				break;
 			case 128:
-				nand->ecc.layout = &fsmc_ecc1_128_layout;
+				mtd_set_ooblayout(mtd,
+						  &fsmc_ecc1_ooblayout_ops);
 				break;
 			default:
 				dev_warn(&pdev->dev,
-- 
2.5.0

[PATCH v5 33/50] mtd: nand: fsmc: get rid of the fsmc_nand_eccplace struct

[Boris Brezillon]

Now that mtd_ooblayout_ecc() returns the ECC byte position using the
OOB free method, we can get rid of the fsmc_nand_eccplace struct.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/fsmc_nand.c | 60 +++++++++++---------------------------------
 include/linux/mtd/fsmc.h     | 18 -------------
 2 files changed, 15 insertions(+), 63 deletions(-)

diff --git a/drivers/mtd/nand/fsmc_nand.c b/drivers/mtd/nand/fsmc_nand.c
index 275a98c..1372040 100644
--- a/drivers/mtd/nand/fsmc_nand.c
+++ b/drivers/mtd/nand/fsmc_nand.c
@@ -39,35 +39,6 @@
 #include <linux/amba/bus.h>
 #include <mtd/mtd-abi.h>
 
-/*
- * ECC placement definitions in oobfree type format.
- * There are 13 bytes of ecc for every 512 byte block and it has to be read
- * consecutively and immediately after the 512 byte data block for hardware to
- * generate the error bit offsets in 512 byte data.
- * Managing the ecc bytes in the following way makes it easier for software to
- * read ecc bytes consecutive to data bytes. This way is similar to
- * oobfree structure maintained already in generic nand driver
- */
-static struct fsmc_eccplace fsmc_ecc4_lp_place = {
-	.eccplace = {
-		{.offset = 2, .length = 13},
-		{.offset = 18, .length = 13},
-		{.offset = 34, .length = 13},
-		{.offset = 50, .length = 13},
-		{.offset = 66, .length = 13},
-		{.offset = 82, .length = 13},
-		{.offset = 98, .length = 13},
-		{.offset = 114, .length = 13}
-	}
-};
-
-static struct fsmc_eccplace fsmc_ecc4_sp_place = {
-	.eccplace = {
-		{.offset = 0, .length = 4},
-		{.offset = 6, .length = 9}
-	}
-};
-
 static int fsmc_ecc1_ooblayout_ecc(struct mtd_info *mtd, int section,
 				   struct mtd_oob_region *oobregion)
 {
@@ -105,6 +76,12 @@ static const struct mtd_ooblayout_ops fsmc_ecc1_ooblayout_ops = {
 	.free = fsmc_ecc1_ooblayout_free,
 };
 
+/*
+ * ECC placement definitions in oobfree type format.
+ * There are 13 bytes of ecc for every 512 byte block and it has to be read
+ * consecutively and immediately after the 512 byte data block for hardware to
+ * generate the error bit offsets in 512 byte data.
+ */
 static int fsmc_ecc4_ooblayout_ecc(struct mtd_info *mtd, int section,
 				   struct mtd_oob_region *oobregion)
 {
@@ -155,7 +132,6 @@ static const struct mtd_ooblayout_ops fsmc_ecc4_ooblayout_ops = {
  * @partitions:		Partition info for a NAND Flash.
  * @nr_partitions:	Total number of partition of a NAND flash.
  *
- * @ecc_place:		ECC placing locations in oobfree type format.
  * @bank:		Bank number for probed device.
  * @clk:		Clock structure for FSMC.
  *
@@ -175,7 +151,6 @@ struct fsmc_nand_data {
 	struct mtd_partition	*partitions;
 	unsigned int		nr_partitions;
 
-	struct fsmc_eccplace	*ecc_place;
 	unsigned int		bank;
 	struct device		*dev;
 	enum access_mode	mode;
@@ -582,8 +557,6 @@ static void fsmc_write_buf_dma(struct mtd_info *mtd, const uint8_t *buf,
 static int fsmc_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
 				 uint8_t *buf, int oob_required, int page)
 {
-	struct fsmc_nand_data *host = mtd_to_fsmc(mtd);
-	struct fsmc_eccplace *ecc_place = host->ecc_place;
 	int i, j, s, stat, eccsize = chip->ecc.size;
 	int eccbytes = chip->ecc.bytes;
 	int eccsteps = chip->ecc.steps;
@@ -606,9 +579,15 @@ static int fsmc_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
 		chip->read_buf(mtd, p, eccsize);
 
 		for (j = 0; j < eccbytes;) {
-			off = ecc_place->eccplace[group].offset;
-			len = ecc_place->eccplace[group].length;
-			group++;
+			struct mtd_oob_region oobregion;
+			int ret;
+
+			ret = mtd_ooblayout_ecc(mtd, group++, &oobregion);
+			if (ret)
+				return ret;
+
+			off = oobregion.offset;
+			len = oobregion.length;
 
 			/*
 			 * length is intentionally kept a higher multiple of 2
@@ -956,19 +935,10 @@ static int __init fsmc_nand_probe(struct platform_device *pdev)
 	if (AMBA_REV_BITS(host->pid) >= 8) {
 		switch (mtd->oobsize) {
 		case 16:
-			host->ecc_place = &fsmc_ecc4_sp_place;
-			break;
 		case 64:
-			host->ecc_place = &fsmc_ecc4_lp_place;
-			break;
 		case 128:
-			host->ecc_place = &fsmc_ecc4_lp_place;
-			break;
 		case 224:
-			host->ecc_place = &fsmc_ecc4_lp_place;
-			break;
 		case 256:
-			host->ecc_place = &fsmc_ecc4_lp_place;
 			break;
 		default:
 			dev_warn(&pdev->dev, "No oob scheme defined for oobsize %d\n",
diff --git a/include/linux/mtd/fsmc.h b/include/linux/mtd/fsmc.h
index c8be32e..ad3c348 100644
--- a/include/linux/mtd/fsmc.h
+++ b/include/linux/mtd/fsmc.h
@@ -103,24 +103,6 @@
 
 #define FSMC_BUSY_WAIT_TIMEOUT	(1 * HZ)
 
-/*
- * There are 13 bytes of ecc for every 512 byte block in FSMC version 8
- * and it has to be read consecutively and immediately after the 512
- * byte data block for hardware to generate the error bit offsets
- * Managing the ecc bytes in the following way is easier. This way is
- * similar to oobfree structure maintained already in u-boot nand driver
- */
-#define MAX_ECCPLACE_ENTRIES	32
-
-struct fsmc_nand_eccplace {
-	uint8_t offset;
-	uint8_t length;
-};
-
-struct fsmc_eccplace {
-	struct fsmc_nand_eccplace eccplace[MAX_ECCPLACE_ENTRIES];
-};
-
 struct fsmc_nand_timings {
 	uint8_t tclr;
 	uint8_t tar;
-- 
2.5.0

[PATCH v5 33/50] mtd: nand: fsmc: get rid of the fsmc_nand_eccplace struct

[Boris Brezillon]

Now that mtd_ooblayout_ecc() returns the ECC byte position using the
OOB free method, we can get rid of the fsmc_nand_eccplace struct.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/mtd/nand/fsmc_nand.c | 60 +++++++++++---------------------------------
 include/linux/mtd/fsmc.h     | 18 -------------
 2 files changed, 15 insertions(+), 63 deletions(-)

diff --git a/drivers/mtd/nand/fsmc_nand.c b/drivers/mtd/nand/fsmc_nand.c
index 275a98c..1372040 100644
--- a/drivers/mtd/nand/fsmc_nand.c
+++ b/drivers/mtd/nand/fsmc_nand.c
@@ -39,35 +39,6 @@
 #include <linux/amba/bus.h>
 #include <mtd/mtd-abi.h>
 
-/*
- * ECC placement definitions in oobfree type format.
- * There are 13 bytes of ecc for every 512 byte block and it has to be read
- * consecutively and immediately after the 512 byte data block for hardware to
- * generate the error bit offsets in 512 byte data.
- * Managing the ecc bytes in the following way makes it easier for software to
- * read ecc bytes consecutive to data bytes. This way is similar to
- * oobfree structure maintained already in generic nand driver
- */
-static struct fsmc_eccplace fsmc_ecc4_lp_place = {
-	.eccplace = {
-		{.offset = 2, .length = 13},
-		{.offset = 18, .length = 13},
-		{.offset = 34, .length = 13},
-		{.offset = 50, .length = 13},
-		{.offset = 66, .length = 13},
-		{.offset = 82, .length = 13},
-		{.offset = 98, .length = 13},
-		{.offset = 114, .length = 13}
-	}
-};
-
-static struct fsmc_eccplace fsmc_ecc4_sp_place = {
-	.eccplace = {
-		{.offset = 0, .length = 4},
-		{.offset = 6, .length = 9}
-	}
-};
-
 static int fsmc_ecc1_ooblayout_ecc(struct mtd_info *mtd, int section,
 				   struct mtd_oob_region *oobregion)
 {
@@ -105,6 +76,12 @@ static const struct mtd_ooblayout_ops fsmc_ecc1_ooblayout_ops = {
 	.free = fsmc_ecc1_ooblayout_free,
 };
 
+/*
+ * ECC placement definitions in oobfree type format.
+ * There are 13 bytes of ecc for every 512 byte block and it has to be read
+ * consecutively and immediately after the 512 byte data block for hardware to
+ * generate the error bit offsets in 512 byte data.
+ */
 static int fsmc_ecc4_ooblayout_ecc(struct mtd_info *mtd, int section,
 				   struct mtd_oob_region *oobregion)
 {
@@ -155,7 +132,6 @@ static const struct mtd_ooblayout_ops fsmc_ecc4_ooblayout_ops = {
  * @partitions:		Partition info for a NAND Flash.
  * @nr_partitions:	Total number of partition of a NAND flash.
  *
- * @ecc_place:		ECC placing locations in oobfree type format.
  * @bank:		Bank number for probed device.
  * @clk:		Clock structure for FSMC.
  *
@@ -175,7 +151,6 @@ struct fsmc_nand_data {
 	struct mtd_partition	*partitions;
 	unsigned int		nr_partitions;
 
-	struct fsmc_eccplace	*ecc_place;
 	unsigned int		bank;
 	struct device		*dev;
 	enum access_mode	mode;
@@ -582,8 +557,6 @@ static void fsmc_write_buf_dma(struct mtd_info *mtd, const uint8_t *buf,
 static int fsmc_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
 				 uint8_t *buf, int oob_required, int page)
 {
-	struct fsmc_nand_data *host = mtd_to_fsmc(mtd);
-	struct fsmc_eccplace *ecc_place = host->ecc_place;
 	int i, j, s, stat, eccsize = chip->ecc.size;
 	int eccbytes = chip->ecc.bytes;
 	int eccsteps = chip->ecc.steps;
@@ -606,9 +579,15 @@ static int fsmc_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
 		chip->read_buf(mtd, p, eccsize);
 
 		for (j = 0; j < eccbytes;) {
-			off = ecc_place->eccplace[group].offset;
-			len = ecc_place->eccplace[group].length;
-			group++;
+			struct mtd_oob_region oobregion;
+			int ret;
+
+			ret = mtd_ooblayout_ecc(mtd, group++, &oobregion);
+			if (ret)
+				return ret;
+
+			off = oobregion.offset;
+			len = oobregion.length;
 
 			/*
 			 * length is intentionally kept a higher multiple of 2
@@ -956,19 +935,10 @@ static int __init fsmc_nand_probe(struct platform_device *pdev)
 	if (AMBA_REV_BITS(host->pid) >= 8) {
 		switch (mtd->oobsize) {
 		case 16:
-			host->ecc_place = &fsmc_ecc4_sp_place;
-			break;
 		case 64:
-			host->ecc_place = &fsmc_ecc4_lp_place;
-			break;
 		case 128:
-			host->ecc_place = &fsmc_ecc4_lp_place;
-			break;
 		case 224:
-			host->ecc_place = &fsmc_ecc4_lp_place;
-			break;
 		case 256:
-			host->ecc_place = &fsmc_ecc4_lp_place;
 			break;
 		default:
 			dev_warn(&pdev->dev, "No oob scheme defined for oobsize %d\n",
diff --git a/include/linux/mtd/fsmc.h b/include/linux/mtd/fsmc.h
index c8be32e..ad3c348 100644
--- a/include/linux/mtd/fsmc.h
+++ b/include/linux/mtd/fsmc.h
@@ -103,24 +103,6 @@
 
 #define FSMC_BUSY_WAIT_TIMEOUT	(1 * HZ)
 
-/*
- * There are 13 bytes of ecc for every 512 byte block in FSMC version 8
- * and it has to be read consecutively and immediately after the 512
- * byte data block for hardware to generate the error bit offsets
- * Managing the ecc bytes in the following way is easier. This way is
- * similar to oobfree structure maintained already in u-boot nand driver
- */
-#define MAX_ECCPLACE_ENTRIES	32
-
-struct fsmc_nand_eccplace {
-	uint8_t offset;
-	uint8_t length;
-};
-
-struct fsmc_eccplace {
-	struct fsmc_nand_eccplace eccplace[MAX_ECCPLACE_ENTRIES];
-};
-
 struct fsmc_nand_timings {
 	uint8_t tclr;
 	uint8_t tar;
-- 
2.5.0

[PATCH v5 33/50] mtd: nand: fsmc: get rid of the fsmc_nand_eccplace struct

[Boris Brezillon]

Now that mtd_ooblayout_ecc() returns the ECC byte position using the
OOB free method, we can get rid of the fsmc_nand_eccplace struct.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/fsmc_nand.c | 60 +++++++++++---------------------------------
 include/linux/mtd/fsmc.h     | 18 -------------
 2 files changed, 15 insertions(+), 63 deletions(-)

diff --git a/drivers/mtd/nand/fsmc_nand.c b/drivers/mtd/nand/fsmc_nand.c
index 275a98c..1372040 100644
--- a/drivers/mtd/nand/fsmc_nand.c
+++ b/drivers/mtd/nand/fsmc_nand.c
@@ -39,35 +39,6 @@
 #include <linux/amba/bus.h>
 #include <mtd/mtd-abi.h>
 
-/*
- * ECC placement definitions in oobfree type format.
- * There are 13 bytes of ecc for every 512 byte block and it has to be read
- * consecutively and immediately after the 512 byte data block for hardware to
- * generate the error bit offsets in 512 byte data.
- * Managing the ecc bytes in the following way makes it easier for software to
- * read ecc bytes consecutive to data bytes. This way is similar to
- * oobfree structure maintained already in generic nand driver
- */
-static struct fsmc_eccplace fsmc_ecc4_lp_place = {
-	.eccplace = {
-		{.offset = 2, .length = 13},
-		{.offset = 18, .length = 13},
-		{.offset = 34, .length = 13},
-		{.offset = 50, .length = 13},
-		{.offset = 66, .length = 13},
-		{.offset = 82, .length = 13},
-		{.offset = 98, .length = 13},
-		{.offset = 114, .length = 13}
-	}
-};
-
-static struct fsmc_eccplace fsmc_ecc4_sp_place = {
-	.eccplace = {
-		{.offset = 0, .length = 4},
-		{.offset = 6, .length = 9}
-	}
-};
-
 static int fsmc_ecc1_ooblayout_ecc(struct mtd_info *mtd, int section,
 				   struct mtd_oob_region *oobregion)
 {
@@ -105,6 +76,12 @@ static const struct mtd_ooblayout_ops fsmc_ecc1_ooblayout_ops = {
 	.free = fsmc_ecc1_ooblayout_free,
 };
 
+/*
+ * ECC placement definitions in oobfree type format.
+ * There are 13 bytes of ecc for every 512 byte block and it has to be read
+ * consecutively and immediately after the 512 byte data block for hardware to
+ * generate the error bit offsets in 512 byte data.
+ */
 static int fsmc_ecc4_ooblayout_ecc(struct mtd_info *mtd, int section,
 				   struct mtd_oob_region *oobregion)
 {
@@ -155,7 +132,6 @@ static const struct mtd_ooblayout_ops fsmc_ecc4_ooblayout_ops = {
  * @partitions:		Partition info for a NAND Flash.
  * @nr_partitions:	Total number of partition of a NAND flash.
  *
- * @ecc_place:		ECC placing locations in oobfree type format.
  * @bank:		Bank number for probed device.
  * @clk:		Clock structure for FSMC.
  *
@@ -175,7 +151,6 @@ struct fsmc_nand_data {
 	struct mtd_partition	*partitions;
 	unsigned int		nr_partitions;
 
-	struct fsmc_eccplace	*ecc_place;
 	unsigned int		bank;
 	struct device		*dev;
 	enum access_mode	mode;
@@ -582,8 +557,6 @@ static void fsmc_write_buf_dma(struct mtd_info *mtd, const uint8_t *buf,
 static int fsmc_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
 				 uint8_t *buf, int oob_required, int page)
 {
-	struct fsmc_nand_data *host = mtd_to_fsmc(mtd);
-	struct fsmc_eccplace *ecc_place = host->ecc_place;
 	int i, j, s, stat, eccsize = chip->ecc.size;
 	int eccbytes = chip->ecc.bytes;
 	int eccsteps = chip->ecc.steps;
@@ -606,9 +579,15 @@ static int fsmc_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
 		chip->read_buf(mtd, p, eccsize);
 
 		for (j = 0; j < eccbytes;) {
-			off = ecc_place->eccplace[group].offset;
-			len = ecc_place->eccplace[group].length;
-			group++;
+			struct mtd_oob_region oobregion;
+			int ret;
+
+			ret = mtd_ooblayout_ecc(mtd, group++, &oobregion);
+			if (ret)
+				return ret;
+
+			off = oobregion.offset;
+			len = oobregion.length;
 
 			/*
 			 * length is intentionally kept a higher multiple of 2
@@ -956,19 +935,10 @@ static int __init fsmc_nand_probe(struct platform_device *pdev)
 	if (AMBA_REV_BITS(host->pid) >= 8) {
 		switch (mtd->oobsize) {
 		case 16:
-			host->ecc_place = &fsmc_ecc4_sp_place;
-			break;
 		case 64:
-			host->ecc_place = &fsmc_ecc4_lp_place;
-			break;
 		case 128:
-			host->ecc_place = &fsmc_ecc4_lp_place;
-			break;
 		case 224:
-			host->ecc_place = &fsmc_ecc4_lp_place;
-			break;
 		case 256:
-			host->ecc_place = &fsmc_ecc4_lp_place;
 			break;
 		default:
 			dev_warn(&pdev->dev, "No oob scheme defined for oobsize %d\n",
diff --git a/include/linux/mtd/fsmc.h b/include/linux/mtd/fsmc.h
index c8be32e..ad3c348 100644
--- a/include/linux/mtd/fsmc.h
+++ b/include/linux/mtd/fsmc.h
@@ -103,24 +103,6 @@
 
 #define FSMC_BUSY_WAIT_TIMEOUT	(1 * HZ)
 
-/*
- * There are 13 bytes of ecc for every 512 byte block in FSMC version 8
- * and it has to be read consecutively and immediately after the 512
- * byte data block for hardware to generate the error bit offsets
- * Managing the ecc bytes in the following way is easier. This way is
- * similar to oobfree structure maintained already in u-boot nand driver
- */
-#define MAX_ECCPLACE_ENTRIES	32
-
-struct fsmc_nand_eccplace {
-	uint8_t offset;
-	uint8_t length;
-};
-
-struct fsmc_eccplace {
-	struct fsmc_nand_eccplace eccplace[MAX_ECCPLACE_ENTRIES];
-};
-
 struct fsmc_nand_timings {
 	uint8_t tclr;
 	uint8_t tar;
-- 
2.5.0

[PATCH v5 34/50] mtd: nand: gpmi: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/gpmi-nand/gpmi-nand.c | 52 ++++++++++++++++++++++++++--------
 1 file changed, 40 insertions(+), 12 deletions(-)

diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
index 3a29b65..316b5ac 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
@@ -47,10 +47,44 @@ static struct nand_bbt_descr gpmi_bbt_descr = {
  * We may change the layout if we can get the ECC info from the datasheet,
  * else we will use all the (page + OOB).
  */
-static struct nand_ecclayout gpmi_hw_ecclayout = {
-	.eccbytes = 0,
-	.eccpos = { 0, },
-	.oobfree = { {.offset = 0, .length = 0} }
+static int gpmi_ooblayout_ecc(struct mtd_info *mtd, int section,
+			      struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct gpmi_nand_data *this = nand_get_controller_data(chip);
+	struct bch_geometry *geo = &this->bch_geometry;
+
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 0;
+	oobregion->length = geo->page_size - mtd->writesize;
+
+	return 0;
+}
+
+static int gpmi_ooblayout_free(struct mtd_info *mtd, int section,
+			       struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct gpmi_nand_data *this = nand_get_controller_data(chip);
+	struct bch_geometry *geo = &this->bch_geometry;
+
+	if (section)
+		return -ERANGE;
+
+	/* The available oob size we have. */
+	if (geo->page_size < mtd->writesize + mtd->oobsize) {
+		oobregion->offset = geo->page_size - mtd->writesize;
+		oobregion->length = mtd->oobsize - oobregion->offset;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops gpmi_ooblayout_ops = {
+	.ecc = gpmi_ooblayout_ecc,
+	.free = gpmi_ooblayout_free,
 };
 
 static const struct gpmi_devdata gpmi_devdata_imx23 = {
@@ -141,7 +175,6 @@ static int set_geometry_by_ecc_info(struct gpmi_nand_data *this)
 	struct bch_geometry *geo = &this->bch_geometry;
 	struct nand_chip *chip = &this->nand;
 	struct mtd_info *mtd = nand_to_mtd(chip);
-	struct nand_oobfree *of = gpmi_hw_ecclayout.oobfree;
 	unsigned int block_mark_bit_offset;
 
 	if (!(chip->ecc_strength_ds > 0 && chip->ecc_step_ds > 0))
@@ -229,12 +262,6 @@ static int set_geometry_by_ecc_info(struct gpmi_nand_data *this)
 	geo->page_size = mtd->writesize + geo->metadata_size +
 		(geo->gf_len * geo->ecc_strength * geo->ecc_chunk_count) / 8;
 
-	/* The available oob size we have. */
-	if (geo->page_size < mtd->writesize + mtd->oobsize) {
-		of->offset = geo->page_size - mtd->writesize;
-		of->length = mtd->oobsize - of->offset;
-	}
-
 	geo->payload_size = mtd->writesize;
 
 	geo->auxiliary_status_offset = ALIGN(geo->metadata_size, 4);
@@ -1841,6 +1868,7 @@ static void gpmi_nand_exit(struct gpmi_nand_data *this)
 static int gpmi_init_last(struct gpmi_nand_data *this)
 {
 	struct nand_chip *chip = &this->nand;
+	struct mtd_info *mtd = nand_to_mtd(chip);
 	struct nand_ecc_ctrl *ecc = &chip->ecc;
 	struct bch_geometry *bch_geo = &this->bch_geometry;
 	int ret;
@@ -1862,7 +1890,7 @@ static int gpmi_init_last(struct gpmi_nand_data *this)
 	ecc->mode	= NAND_ECC_HW;
 	ecc->size	= bch_geo->ecc_chunk_size;
 	ecc->strength	= bch_geo->ecc_strength;
-	ecc->layout	= &gpmi_hw_ecclayout;
+	mtd_set_ooblayout(mtd, &gpmi_ooblayout_ops);
 
 	/*
 	 * We only enable the subpage read when:
-- 
2.5.0

[PATCH v5 34/50] mtd: nand: gpmi: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/mtd/nand/gpmi-nand/gpmi-nand.c | 52 ++++++++++++++++++++++++++--------
 1 file changed, 40 insertions(+), 12 deletions(-)

diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
index 3a29b65..316b5ac 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
@@ -47,10 +47,44 @@ static struct nand_bbt_descr gpmi_bbt_descr = {
  * We may change the layout if we can get the ECC info from the datasheet,
  * else we will use all the (page + OOB).
  */
-static struct nand_ecclayout gpmi_hw_ecclayout = {
-	.eccbytes = 0,
-	.eccpos = { 0, },
-	.oobfree = { {.offset = 0, .length = 0} }
+static int gpmi_ooblayout_ecc(struct mtd_info *mtd, int section,
+			      struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct gpmi_nand_data *this = nand_get_controller_data(chip);
+	struct bch_geometry *geo = &this->bch_geometry;
+
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 0;
+	oobregion->length = geo->page_size - mtd->writesize;
+
+	return 0;
+}
+
+static int gpmi_ooblayout_free(struct mtd_info *mtd, int section,
+			       struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct gpmi_nand_data *this = nand_get_controller_data(chip);
+	struct bch_geometry *geo = &this->bch_geometry;
+
+	if (section)
+		return -ERANGE;
+
+	/* The available oob size we have. */
+	if (geo->page_size < mtd->writesize + mtd->oobsize) {
+		oobregion->offset = geo->page_size - mtd->writesize;
+		oobregion->length = mtd->oobsize - oobregion->offset;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops gpmi_ooblayout_ops = {
+	.ecc = gpmi_ooblayout_ecc,
+	.free = gpmi_ooblayout_free,
 };
 
 static const struct gpmi_devdata gpmi_devdata_imx23 = {
@@ -141,7 +175,6 @@ static int set_geometry_by_ecc_info(struct gpmi_nand_data *this)
 	struct bch_geometry *geo = &this->bch_geometry;
 	struct nand_chip *chip = &this->nand;
 	struct mtd_info *mtd = nand_to_mtd(chip);
-	struct nand_oobfree *of = gpmi_hw_ecclayout.oobfree;
 	unsigned int block_mark_bit_offset;
 
 	if (!(chip->ecc_strength_ds > 0 && chip->ecc_step_ds > 0))
@@ -229,12 +262,6 @@ static int set_geometry_by_ecc_info(struct gpmi_nand_data *this)
 	geo->page_size = mtd->writesize + geo->metadata_size +
 		(geo->gf_len * geo->ecc_strength * geo->ecc_chunk_count) / 8;
 
-	/* The available oob size we have. */
-	if (geo->page_size < mtd->writesize + mtd->oobsize) {
-		of->offset = geo->page_size - mtd->writesize;
-		of->length = mtd->oobsize - of->offset;
-	}
-
 	geo->payload_size = mtd->writesize;
 
 	geo->auxiliary_status_offset = ALIGN(geo->metadata_size, 4);
@@ -1841,6 +1868,7 @@ static void gpmi_nand_exit(struct gpmi_nand_data *this)
 static int gpmi_init_last(struct gpmi_nand_data *this)
 {
 	struct nand_chip *chip = &this->nand;
+	struct mtd_info *mtd = nand_to_mtd(chip);
 	struct nand_ecc_ctrl *ecc = &chip->ecc;
 	struct bch_geometry *bch_geo = &this->bch_geometry;
 	int ret;
@@ -1862,7 +1890,7 @@ static int gpmi_init_last(struct gpmi_nand_data *this)
 	ecc->mode	= NAND_ECC_HW;
 	ecc->size	= bch_geo->ecc_chunk_size;
 	ecc->strength	= bch_geo->ecc_strength;
-	ecc->layout	= &gpmi_hw_ecclayout;
+	mtd_set_ooblayout(mtd, &gpmi_ooblayout_ops);
 
 	/*
 	 * We only enable the subpage read when:
-- 
2.5.0

[PATCH v5 34/50] mtd: nand: gpmi: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/gpmi-nand/gpmi-nand.c | 52 ++++++++++++++++++++++++++--------
 1 file changed, 40 insertions(+), 12 deletions(-)

diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
index 3a29b65..316b5ac 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
@@ -47,10 +47,44 @@ static struct nand_bbt_descr gpmi_bbt_descr = {
  * We may change the layout if we can get the ECC info from the datasheet,
  * else we will use all the (page + OOB).
  */
-static struct nand_ecclayout gpmi_hw_ecclayout = {
-	.eccbytes = 0,
-	.eccpos = { 0, },
-	.oobfree = { {.offset = 0, .length = 0} }
+static int gpmi_ooblayout_ecc(struct mtd_info *mtd, int section,
+			      struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct gpmi_nand_data *this = nand_get_controller_data(chip);
+	struct bch_geometry *geo = &this->bch_geometry;
+
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 0;
+	oobregion->length = geo->page_size - mtd->writesize;
+
+	return 0;
+}
+
+static int gpmi_ooblayout_free(struct mtd_info *mtd, int section,
+			       struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct gpmi_nand_data *this = nand_get_controller_data(chip);
+	struct bch_geometry *geo = &this->bch_geometry;
+
+	if (section)
+		return -ERANGE;
+
+	/* The available oob size we have. */
+	if (geo->page_size < mtd->writesize + mtd->oobsize) {
+		oobregion->offset = geo->page_size - mtd->writesize;
+		oobregion->length = mtd->oobsize - oobregion->offset;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops gpmi_ooblayout_ops = {
+	.ecc = gpmi_ooblayout_ecc,
+	.free = gpmi_ooblayout_free,
 };
 
 static const struct gpmi_devdata gpmi_devdata_imx23 = {
@@ -141,7 +175,6 @@ static int set_geometry_by_ecc_info(struct gpmi_nand_data *this)
 	struct bch_geometry *geo = &this->bch_geometry;
 	struct nand_chip *chip = &this->nand;
 	struct mtd_info *mtd = nand_to_mtd(chip);
-	struct nand_oobfree *of = gpmi_hw_ecclayout.oobfree;
 	unsigned int block_mark_bit_offset;
 
 	if (!(chip->ecc_strength_ds > 0 && chip->ecc_step_ds > 0))
@@ -229,12 +262,6 @@ static int set_geometry_by_ecc_info(struct gpmi_nand_data *this)
 	geo->page_size = mtd->writesize + geo->metadata_size +
 		(geo->gf_len * geo->ecc_strength * geo->ecc_chunk_count) / 8;
 
-	/* The available oob size we have. */
-	if (geo->page_size < mtd->writesize + mtd->oobsize) {
-		of->offset = geo->page_size - mtd->writesize;
-		of->length = mtd->oobsize - of->offset;
-	}
-
 	geo->payload_size = mtd->writesize;
 
 	geo->auxiliary_status_offset = ALIGN(geo->metadata_size, 4);
@@ -1841,6 +1868,7 @@ static void gpmi_nand_exit(struct gpmi_nand_data *this)
 static int gpmi_init_last(struct gpmi_nand_data *this)
 {
 	struct nand_chip *chip = &this->nand;
+	struct mtd_info *mtd = nand_to_mtd(chip);
 	struct nand_ecc_ctrl *ecc = &chip->ecc;
 	struct bch_geometry *bch_geo = &this->bch_geometry;
 	int ret;
@@ -1862,7 +1890,7 @@ static int gpmi_init_last(struct gpmi_nand_data *this)
 	ecc->mode	= NAND_ECC_HW;
 	ecc->size	= bch_geo->ecc_chunk_size;
 	ecc->strength	= bch_geo->ecc_strength;
-	ecc->layout	= &gpmi_hw_ecclayout;
+	mtd_set_ooblayout(mtd, &gpmi_ooblayout_ops);
 
 	/*
 	 * We only enable the subpage read when:
-- 
2.5.0

[PATCH v5 35/50] mtd: nand: hisi504: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/hisi504_nand.c | 26 +++++++++++++++++++++++---
 1 file changed, 23 insertions(+), 3 deletions(-)

diff --git a/drivers/mtd/nand/hisi504_nand.c b/drivers/mtd/nand/hisi504_nand.c
index 96502b6..7bf844c 100644
--- a/drivers/mtd/nand/hisi504_nand.c
+++ b/drivers/mtd/nand/hisi504_nand.c
@@ -631,8 +631,28 @@ static void hisi_nfc_host_init(struct hinfc_host *host)
 	hinfc_write(host, HINFC504_INTEN_DMA, HINFC504_INTEN);
 }
 
-static struct nand_ecclayout nand_ecc_2K_16bits = {
-	.oobfree = { {2, 6} },
+static int hisi_ooblayout_ecc(struct mtd_info *mtd, int section,
+			      struct mtd_oob_region *oobregion)
+{
+	/* FIXME: add ECC bytes position */
+	return -ENOTSUPP;
+}
+
+static int hisi_ooblayout_free(struct mtd_info *mtd, int section,
+			       struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 2;
+	oobregion->length = 6;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops hisi_ooblayout_ops = {
+	.ecc = hisi_ooblayout_ecc,
+	.free = hisi_ooblayout_free,
 };
 
 static int hisi_nfc_ecc_probe(struct hinfc_host *host)
@@ -668,7 +688,7 @@ static int hisi_nfc_ecc_probe(struct hinfc_host *host)
 	case 16:
 		ecc_bits = 6;
 		if (mtd->writesize == 2048)
-			chip->ecc.layout = &nand_ecc_2K_16bits;
+			mtd_set_ooblayout(mtd, &hisi_ooblayout_ops);
 
 		/* TODO: add more page size support */
 		break;
-- 
2.5.0

[PATCH v5 35/50] mtd: nand: hisi504: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/mtd/nand/hisi504_nand.c | 26 +++++++++++++++++++++++---
 1 file changed, 23 insertions(+), 3 deletions(-)

diff --git a/drivers/mtd/nand/hisi504_nand.c b/drivers/mtd/nand/hisi504_nand.c
index 96502b6..7bf844c 100644
--- a/drivers/mtd/nand/hisi504_nand.c
+++ b/drivers/mtd/nand/hisi504_nand.c
@@ -631,8 +631,28 @@ static void hisi_nfc_host_init(struct hinfc_host *host)
 	hinfc_write(host, HINFC504_INTEN_DMA, HINFC504_INTEN);
 }
 
-static struct nand_ecclayout nand_ecc_2K_16bits = {
-	.oobfree = { {2, 6} },
+static int hisi_ooblayout_ecc(struct mtd_info *mtd, int section,
+			      struct mtd_oob_region *oobregion)
+{
+	/* FIXME: add ECC bytes position */
+	return -ENOTSUPP;
+}
+
+static int hisi_ooblayout_free(struct mtd_info *mtd, int section,
+			       struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 2;
+	oobregion->length = 6;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops hisi_ooblayout_ops = {
+	.ecc = hisi_ooblayout_ecc,
+	.free = hisi_ooblayout_free,
 };
 
 static int hisi_nfc_ecc_probe(struct hinfc_host *host)
@@ -668,7 +688,7 @@ static int hisi_nfc_ecc_probe(struct hinfc_host *host)
 	case 16:
 		ecc_bits = 6;
 		if (mtd->writesize == 2048)
-			chip->ecc.layout = &nand_ecc_2K_16bits;
+			mtd_set_ooblayout(mtd, &hisi_ooblayout_ops);
 
 		/* TODO: add more page size support */
 		break;
-- 
2.5.0

[PATCH v5 35/50] mtd: nand: hisi504: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/hisi504_nand.c | 26 +++++++++++++++++++++++---
 1 file changed, 23 insertions(+), 3 deletions(-)

diff --git a/drivers/mtd/nand/hisi504_nand.c b/drivers/mtd/nand/hisi504_nand.c
index 96502b6..7bf844c 100644
--- a/drivers/mtd/nand/hisi504_nand.c
+++ b/drivers/mtd/nand/hisi504_nand.c
@@ -631,8 +631,28 @@ static void hisi_nfc_host_init(struct hinfc_host *host)
 	hinfc_write(host, HINFC504_INTEN_DMA, HINFC504_INTEN);
 }
 
-static struct nand_ecclayout nand_ecc_2K_16bits = {
-	.oobfree = { {2, 6} },
+static int hisi_ooblayout_ecc(struct mtd_info *mtd, int section,
+			      struct mtd_oob_region *oobregion)
+{
+	/* FIXME: add ECC bytes position */
+	return -ENOTSUPP;
+}
+
+static int hisi_ooblayout_free(struct mtd_info *mtd, int section,
+			       struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 2;
+	oobregion->length = 6;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops hisi_ooblayout_ops = {
+	.ecc = hisi_ooblayout_ecc,
+	.free = hisi_ooblayout_free,
 };
 
 static int hisi_nfc_ecc_probe(struct hinfc_host *host)
@@ -668,7 +688,7 @@ static int hisi_nfc_ecc_probe(struct hinfc_host *host)
 	case 16:
 		ecc_bits = 6;
 		if (mtd->writesize == 2048)
-			chip->ecc.layout = &nand_ecc_2K_16bits;
+			mtd_set_ooblayout(mtd, &hisi_ooblayout_ops);
 
 		/* TODO: add more page size support */
 		break;
-- 
2.5.0

[PATCH v5 36/50] mtd: nand: jz4780: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Tested-by: Harvey Hunt <harvey.hunt@imgtec.com>
---
 drivers/mtd/nand/jz4780_nand.c | 19 +++++--------------
 1 file changed, 5 insertions(+), 14 deletions(-)

diff --git a/drivers/mtd/nand/jz4780_nand.c b/drivers/mtd/nand/jz4780_nand.c
index e1c016c..b86a579 100644
--- a/drivers/mtd/nand/jz4780_nand.c
+++ b/drivers/mtd/nand/jz4780_nand.c
@@ -56,8 +56,6 @@ struct jz4780_nand_chip {
 	struct nand_chip chip;
 	struct list_head chip_list;
 
-	struct nand_ecclayout ecclayout;
-
 	struct gpio_desc *busy_gpio;
 	struct gpio_desc *wp_gpio;
 	unsigned int reading: 1;
@@ -165,8 +163,7 @@ static int jz4780_nand_init_ecc(struct jz4780_nand_chip *nand, struct device *de
 	struct nand_chip *chip = &nand->chip;
 	struct mtd_info *mtd = nand_to_mtd(chip);
 	struct jz4780_nand_controller *nfc = to_jz4780_nand_controller(chip->controller);
-	struct nand_ecclayout *layout = &nand->ecclayout;
-	u32 start, i;
+	int eccbytes;
 
 	chip->ecc.bytes = fls((1 + 8) * chip->ecc.size)	*
 				(chip->ecc.strength / 8);
@@ -201,23 +198,17 @@ static int jz4780_nand_init_ecc(struct jz4780_nand_chip *nand, struct device *de
 		return 0;
 
 	/* Generate ECC layout. ECC codes are right aligned in the OOB area. */
-	layout->eccbytes = mtd->writesize / chip->ecc.size * chip->ecc.bytes;
+	eccbytes = mtd->writesize / chip->ecc.size * chip->ecc.bytes;
 
-	if (layout->eccbytes > mtd->oobsize - 2) {
+	if (eccbytes > mtd->oobsize - 2) {
 		dev_err(dev,
 			"invalid ECC config: required %d ECC bytes, but only %d are available",
-			layout->eccbytes, mtd->oobsize - 2);
+			eccbytes, mtd->oobsize - 2);
 		return -EINVAL;
 	}
 
-	start = mtd->oobsize - layout->eccbytes;
-	for (i = 0; i < layout->eccbytes; i++)
-		layout->eccpos[i] = start + i;
-
-	layout->oobfree[0].offset = 2;
-	layout->oobfree[0].length = mtd->oobsize - layout->eccbytes - 2;
+	mtd->ooblayout = &nand_ooblayout_lp_ops;
 
-	chip->ecc.layout = layout;
 	return 0;
 }
 
-- 
2.5.0

[PATCH v5 36/50] mtd: nand: jz4780: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
Tested-by: Harvey Hunt <harvey.hunt-1AXoQHu6uovQT0dZR+AlfA@public.gmane.org>
---
 drivers/mtd/nand/jz4780_nand.c | 19 +++++--------------
 1 file changed, 5 insertions(+), 14 deletions(-)

diff --git a/drivers/mtd/nand/jz4780_nand.c b/drivers/mtd/nand/jz4780_nand.c
index e1c016c..b86a579 100644
--- a/drivers/mtd/nand/jz4780_nand.c
+++ b/drivers/mtd/nand/jz4780_nand.c
@@ -56,8 +56,6 @@ struct jz4780_nand_chip {
 	struct nand_chip chip;
 	struct list_head chip_list;
 
-	struct nand_ecclayout ecclayout;
-
 	struct gpio_desc *busy_gpio;
 	struct gpio_desc *wp_gpio;
 	unsigned int reading: 1;
@@ -165,8 +163,7 @@ static int jz4780_nand_init_ecc(struct jz4780_nand_chip *nand, struct device *de
 	struct nand_chip *chip = &nand->chip;
 	struct mtd_info *mtd = nand_to_mtd(chip);
 	struct jz4780_nand_controller *nfc = to_jz4780_nand_controller(chip->controller);
-	struct nand_ecclayout *layout = &nand->ecclayout;
-	u32 start, i;
+	int eccbytes;
 
 	chip->ecc.bytes = fls((1 + 8) * chip->ecc.size)	*
 				(chip->ecc.strength / 8);
@@ -201,23 +198,17 @@ static int jz4780_nand_init_ecc(struct jz4780_nand_chip *nand, struct device *de
 		return 0;
 
 	/* Generate ECC layout. ECC codes are right aligned in the OOB area. */
-	layout->eccbytes = mtd->writesize / chip->ecc.size * chip->ecc.bytes;
+	eccbytes = mtd->writesize / chip->ecc.size * chip->ecc.bytes;
 
-	if (layout->eccbytes > mtd->oobsize - 2) {
+	if (eccbytes > mtd->oobsize - 2) {
 		dev_err(dev,
 			"invalid ECC config: required %d ECC bytes, but only %d are available",
-			layout->eccbytes, mtd->oobsize - 2);
+			eccbytes, mtd->oobsize - 2);
 		return -EINVAL;
 	}
 
-	start = mtd->oobsize - layout->eccbytes;
-	for (i = 0; i < layout->eccbytes; i++)
-		layout->eccpos[i] = start + i;
-
-	layout->oobfree[0].offset = 2;
-	layout->oobfree[0].length = mtd->oobsize - layout->eccbytes - 2;
+	mtd->ooblayout = &nand_ooblayout_lp_ops;
 
-	chip->ecc.layout = layout;
 	return 0;
 }
 
-- 
2.5.0

[PATCH v5 36/50] mtd: nand: jz4780: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Tested-by: Harvey Hunt <harvey.hunt@imgtec.com>
---
 drivers/mtd/nand/jz4780_nand.c | 19 +++++--------------
 1 file changed, 5 insertions(+), 14 deletions(-)

diff --git a/drivers/mtd/nand/jz4780_nand.c b/drivers/mtd/nand/jz4780_nand.c
index e1c016c..b86a579 100644
--- a/drivers/mtd/nand/jz4780_nand.c
+++ b/drivers/mtd/nand/jz4780_nand.c
@@ -56,8 +56,6 @@ struct jz4780_nand_chip {
 	struct nand_chip chip;
 	struct list_head chip_list;
 
-	struct nand_ecclayout ecclayout;
-
 	struct gpio_desc *busy_gpio;
 	struct gpio_desc *wp_gpio;
 	unsigned int reading: 1;
@@ -165,8 +163,7 @@ static int jz4780_nand_init_ecc(struct jz4780_nand_chip *nand, struct device *de
 	struct nand_chip *chip = &nand->chip;
 	struct mtd_info *mtd = nand_to_mtd(chip);
 	struct jz4780_nand_controller *nfc = to_jz4780_nand_controller(chip->controller);
-	struct nand_ecclayout *layout = &nand->ecclayout;
-	u32 start, i;
+	int eccbytes;
 
 	chip->ecc.bytes = fls((1 + 8) * chip->ecc.size)	*
 				(chip->ecc.strength / 8);
@@ -201,23 +198,17 @@ static int jz4780_nand_init_ecc(struct jz4780_nand_chip *nand, struct device *de
 		return 0;
 
 	/* Generate ECC layout. ECC codes are right aligned in the OOB area. */
-	layout->eccbytes = mtd->writesize / chip->ecc.size * chip->ecc.bytes;
+	eccbytes = mtd->writesize / chip->ecc.size * chip->ecc.bytes;
 
-	if (layout->eccbytes > mtd->oobsize - 2) {
+	if (eccbytes > mtd->oobsize - 2) {
 		dev_err(dev,
 			"invalid ECC config: required %d ECC bytes, but only %d are available",
-			layout->eccbytes, mtd->oobsize - 2);
+			eccbytes, mtd->oobsize - 2);
 		return -EINVAL;
 	}
 
-	start = mtd->oobsize - layout->eccbytes;
-	for (i = 0; i < layout->eccbytes; i++)
-		layout->eccpos[i] = start + i;
-
-	layout->oobfree[0].offset = 2;
-	layout->oobfree[0].length = mtd->oobsize - layout->eccbytes - 2;
+	mtd->ooblayout = &nand_ooblayout_lp_ops;
 
-	chip->ecc.layout = layout;
 	return 0;
 }
 
-- 
2.5.0

[PATCH v5 37/50] mtd: nand: lpc32xx: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/lpc32xx_mlc.c | 50 ++++++++++++++++++++++++++++--------------
 drivers/mtd/nand/lpc32xx_slc.c | 41 +++++++++++++++++++++++++++-------
 2 files changed, 66 insertions(+), 25 deletions(-)

diff --git a/drivers/mtd/nand/lpc32xx_mlc.c b/drivers/mtd/nand/lpc32xx_mlc.c
index d8c3e7a..f668282 100644
--- a/drivers/mtd/nand/lpc32xx_mlc.c
+++ b/drivers/mtd/nand/lpc32xx_mlc.c
@@ -139,22 +139,37 @@ struct lpc32xx_nand_cfg_mlc {
 	unsigned num_parts;
 };
 
-static struct nand_ecclayout lpc32xx_nand_oob = {
-	.eccbytes = 40,
-	.eccpos = { 6,  7,  8,  9, 10, 11, 12, 13, 14, 15,
-		   22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
-		   38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
-		   54, 55, 56, 57, 58, 59, 60, 61, 62, 63 },
-	.oobfree = {
-		{ .offset = 0,
-		  .length = 6, },
-		{ .offset = 16,
-		  .length = 6, },
-		{ .offset = 32,
-		  .length = 6, },
-		{ .offset = 48,
-		  .length = 6, },
-		},
+static int lpc32xx_ooblayout_ecc(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *nand_chip = mtd_to_nand(mtd);
+
+	if (section >= nand_chip->ecc.steps)
+		return -ERANGE;
+
+	oobregion->offset = ((section + 1) * 16) - nand_chip->ecc.bytes;
+	oobregion->length = nand_chip->ecc.bytes;
+
+	return 0;
+}
+
+static int lpc32xx_ooblayout_free(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *nand_chip = mtd_to_nand(mtd);
+
+	if (section >= nand_chip->ecc.steps)
+		return -ERANGE;
+
+	oobregion->offset = 16 * section;
+	oobregion->length = 16 - nand_chip->ecc.bytes;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops lpc32xx_ooblayout_ops = {
+	.ecc = lpc32xx_ooblayout_ecc,
+	.free = lpc32xx_ooblayout_free,
 };
 
 static struct nand_bbt_descr lpc32xx_nand_bbt = {
@@ -713,6 +728,7 @@ static int lpc32xx_nand_probe(struct platform_device *pdev)
 	nand_chip->ecc.write_oob = lpc32xx_write_oob;
 	nand_chip->ecc.read_oob = lpc32xx_read_oob;
 	nand_chip->ecc.strength = 4;
+	nand_chip->ecc.bytes = 10;
 	nand_chip->waitfunc = lpc32xx_waitfunc;
 
 	nand_chip->options = NAND_NO_SUBPAGE_WRITE;
@@ -751,7 +767,7 @@ static int lpc32xx_nand_probe(struct platform_device *pdev)
 
 	nand_chip->ecc.mode = NAND_ECC_HW;
 	nand_chip->ecc.size = 512;
-	nand_chip->ecc.layout = &lpc32xx_nand_oob;
+	mtd_set_ooblayout(mtd, &lpc32xx_ooblayout_ops);
 	host->mlcsubpages = mtd->writesize / 512;
 
 	/* initially clear interrupt status */
diff --git a/drivers/mtd/nand/lpc32xx_slc.c b/drivers/mtd/nand/lpc32xx_slc.c
index 10cf8e62..219dd67 100644
--- a/drivers/mtd/nand/lpc32xx_slc.c
+++ b/drivers/mtd/nand/lpc32xx_slc.c
@@ -146,13 +146,38 @@
  * NAND ECC Layout for small page NAND devices
  * Note: For large and huge page devices, the default layouts are used
  */
-static struct nand_ecclayout lpc32xx_nand_oob_16 = {
-	.eccbytes = 6,
-	.eccpos = {10, 11, 12, 13, 14, 15},
-	.oobfree = {
-		{ .offset = 0, .length = 4 },
-		{ .offset = 6, .length = 4 },
-	},
+static int lpc32xx_ooblayout_ecc(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->length = 6;
+	oobregion->offset = 10;
+
+	return 0;
+}
+
+static int lpc32xx_ooblayout_free(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	if (section > 1)
+		return -ERANGE;
+
+	if (!section) {
+		oobregion->offset = 0;
+		oobregion->length = 4;
+	} else {
+		oobregion->offset = 6;
+		oobregion->length = 4;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops lpc32xx_ooblayout_ops = {
+	.ecc = lpc32xx_ooblayout_ecc,
+	.free = lpc32xx_ooblayout_free,
 };
 
 static u8 bbt_pattern[] = {'B', 'b', 't', '0' };
@@ -886,7 +911,7 @@ static int lpc32xx_nand_probe(struct platform_device *pdev)
 	 * custom BBT marker layout.
 	 */
 	if (mtd->writesize <= 512)
-		chip->ecc.layout = &lpc32xx_nand_oob_16;
+		mtd_set_ooblayout(mtd, &lpc32xx_ooblayout_ops);
 
 	/* These sizes remain the same regardless of page size */
 	chip->ecc.size = 256;
-- 
2.5.0

[PATCH v5 37/50] mtd: nand: lpc32xx: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/mtd/nand/lpc32xx_mlc.c | 50 ++++++++++++++++++++++++++++--------------
 drivers/mtd/nand/lpc32xx_slc.c | 41 +++++++++++++++++++++++++++-------
 2 files changed, 66 insertions(+), 25 deletions(-)

diff --git a/drivers/mtd/nand/lpc32xx_mlc.c b/drivers/mtd/nand/lpc32xx_mlc.c
index d8c3e7a..f668282 100644
--- a/drivers/mtd/nand/lpc32xx_mlc.c
+++ b/drivers/mtd/nand/lpc32xx_mlc.c
@@ -139,22 +139,37 @@ struct lpc32xx_nand_cfg_mlc {
 	unsigned num_parts;
 };
 
-static struct nand_ecclayout lpc32xx_nand_oob = {
-	.eccbytes = 40,
-	.eccpos = { 6,  7,  8,  9, 10, 11, 12, 13, 14, 15,
-		   22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
-		   38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
-		   54, 55, 56, 57, 58, 59, 60, 61, 62, 63 },
-	.oobfree = {
-		{ .offset = 0,
-		  .length = 6, },
-		{ .offset = 16,
-		  .length = 6, },
-		{ .offset = 32,
-		  .length = 6, },
-		{ .offset = 48,
-		  .length = 6, },
-		},
+static int lpc32xx_ooblayout_ecc(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *nand_chip = mtd_to_nand(mtd);
+
+	if (section >= nand_chip->ecc.steps)
+		return -ERANGE;
+
+	oobregion->offset = ((section + 1) * 16) - nand_chip->ecc.bytes;
+	oobregion->length = nand_chip->ecc.bytes;
+
+	return 0;
+}
+
+static int lpc32xx_ooblayout_free(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *nand_chip = mtd_to_nand(mtd);
+
+	if (section >= nand_chip->ecc.steps)
+		return -ERANGE;
+
+	oobregion->offset = 16 * section;
+	oobregion->length = 16 - nand_chip->ecc.bytes;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops lpc32xx_ooblayout_ops = {
+	.ecc = lpc32xx_ooblayout_ecc,
+	.free = lpc32xx_ooblayout_free,
 };
 
 static struct nand_bbt_descr lpc32xx_nand_bbt = {
@@ -713,6 +728,7 @@ static int lpc32xx_nand_probe(struct platform_device *pdev)
 	nand_chip->ecc.write_oob = lpc32xx_write_oob;
 	nand_chip->ecc.read_oob = lpc32xx_read_oob;
 	nand_chip->ecc.strength = 4;
+	nand_chip->ecc.bytes = 10;
 	nand_chip->waitfunc = lpc32xx_waitfunc;
 
 	nand_chip->options = NAND_NO_SUBPAGE_WRITE;
@@ -751,7 +767,7 @@ static int lpc32xx_nand_probe(struct platform_device *pdev)
 
 	nand_chip->ecc.mode = NAND_ECC_HW;
 	nand_chip->ecc.size = 512;
-	nand_chip->ecc.layout = &lpc32xx_nand_oob;
+	mtd_set_ooblayout(mtd, &lpc32xx_ooblayout_ops);
 	host->mlcsubpages = mtd->writesize / 512;
 
 	/* initially clear interrupt status */
diff --git a/drivers/mtd/nand/lpc32xx_slc.c b/drivers/mtd/nand/lpc32xx_slc.c
index 10cf8e62..219dd67 100644
--- a/drivers/mtd/nand/lpc32xx_slc.c
+++ b/drivers/mtd/nand/lpc32xx_slc.c
@@ -146,13 +146,38 @@
  * NAND ECC Layout for small page NAND devices
  * Note: For large and huge page devices, the default layouts are used
  */
-static struct nand_ecclayout lpc32xx_nand_oob_16 = {
-	.eccbytes = 6,
-	.eccpos = {10, 11, 12, 13, 14, 15},
-	.oobfree = {
-		{ .offset = 0, .length = 4 },
-		{ .offset = 6, .length = 4 },
-	},
+static int lpc32xx_ooblayout_ecc(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->length = 6;
+	oobregion->offset = 10;
+
+	return 0;
+}
+
+static int lpc32xx_ooblayout_free(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	if (section > 1)
+		return -ERANGE;
+
+	if (!section) {
+		oobregion->offset = 0;
+		oobregion->length = 4;
+	} else {
+		oobregion->offset = 6;
+		oobregion->length = 4;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops lpc32xx_ooblayout_ops = {
+	.ecc = lpc32xx_ooblayout_ecc,
+	.free = lpc32xx_ooblayout_free,
 };
 
 static u8 bbt_pattern[] = {'B', 'b', 't', '0' };
@@ -886,7 +911,7 @@ static int lpc32xx_nand_probe(struct platform_device *pdev)
 	 * custom BBT marker layout.
 	 */
 	if (mtd->writesize <= 512)
-		chip->ecc.layout = &lpc32xx_nand_oob_16;
+		mtd_set_ooblayout(mtd, &lpc32xx_ooblayout_ops);
 
 	/* These sizes remain the same regardless of page size */
 	chip->ecc.size = 256;
-- 
2.5.0

[PATCH v5 37/50] mtd: nand: lpc32xx: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/lpc32xx_mlc.c | 50 ++++++++++++++++++++++++++++--------------
 drivers/mtd/nand/lpc32xx_slc.c | 41 +++++++++++++++++++++++++++-------
 2 files changed, 66 insertions(+), 25 deletions(-)

diff --git a/drivers/mtd/nand/lpc32xx_mlc.c b/drivers/mtd/nand/lpc32xx_mlc.c
index d8c3e7a..f668282 100644
--- a/drivers/mtd/nand/lpc32xx_mlc.c
+++ b/drivers/mtd/nand/lpc32xx_mlc.c
@@ -139,22 +139,37 @@ struct lpc32xx_nand_cfg_mlc {
 	unsigned num_parts;
 };
 
-static struct nand_ecclayout lpc32xx_nand_oob = {
-	.eccbytes = 40,
-	.eccpos = { 6,  7,  8,  9, 10, 11, 12, 13, 14, 15,
-		   22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
-		   38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
-		   54, 55, 56, 57, 58, 59, 60, 61, 62, 63 },
-	.oobfree = {
-		{ .offset = 0,
-		  .length = 6, },
-		{ .offset = 16,
-		  .length = 6, },
-		{ .offset = 32,
-		  .length = 6, },
-		{ .offset = 48,
-		  .length = 6, },
-		},
+static int lpc32xx_ooblayout_ecc(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *nand_chip = mtd_to_nand(mtd);
+
+	if (section >= nand_chip->ecc.steps)
+		return -ERANGE;
+
+	oobregion->offset = ((section + 1) * 16) - nand_chip->ecc.bytes;
+	oobregion->length = nand_chip->ecc.bytes;
+
+	return 0;
+}
+
+static int lpc32xx_ooblayout_free(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *nand_chip = mtd_to_nand(mtd);
+
+	if (section >= nand_chip->ecc.steps)
+		return -ERANGE;
+
+	oobregion->offset = 16 * section;
+	oobregion->length = 16 - nand_chip->ecc.bytes;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops lpc32xx_ooblayout_ops = {
+	.ecc = lpc32xx_ooblayout_ecc,
+	.free = lpc32xx_ooblayout_free,
 };
 
 static struct nand_bbt_descr lpc32xx_nand_bbt = {
@@ -713,6 +728,7 @@ static int lpc32xx_nand_probe(struct platform_device *pdev)
 	nand_chip->ecc.write_oob = lpc32xx_write_oob;
 	nand_chip->ecc.read_oob = lpc32xx_read_oob;
 	nand_chip->ecc.strength = 4;
+	nand_chip->ecc.bytes = 10;
 	nand_chip->waitfunc = lpc32xx_waitfunc;
 
 	nand_chip->options = NAND_NO_SUBPAGE_WRITE;
@@ -751,7 +767,7 @@ static int lpc32xx_nand_probe(struct platform_device *pdev)
 
 	nand_chip->ecc.mode = NAND_ECC_HW;
 	nand_chip->ecc.size = 512;
-	nand_chip->ecc.layout = &lpc32xx_nand_oob;
+	mtd_set_ooblayout(mtd, &lpc32xx_ooblayout_ops);
 	host->mlcsubpages = mtd->writesize / 512;
 
 	/* initially clear interrupt status */
diff --git a/drivers/mtd/nand/lpc32xx_slc.c b/drivers/mtd/nand/lpc32xx_slc.c
index 10cf8e62..219dd67 100644
--- a/drivers/mtd/nand/lpc32xx_slc.c
+++ b/drivers/mtd/nand/lpc32xx_slc.c
@@ -146,13 +146,38 @@
  * NAND ECC Layout for small page NAND devices
  * Note: For large and huge page devices, the default layouts are used
  */
-static struct nand_ecclayout lpc32xx_nand_oob_16 = {
-	.eccbytes = 6,
-	.eccpos = {10, 11, 12, 13, 14, 15},
-	.oobfree = {
-		{ .offset = 0, .length = 4 },
-		{ .offset = 6, .length = 4 },
-	},
+static int lpc32xx_ooblayout_ecc(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->length = 6;
+	oobregion->offset = 10;
+
+	return 0;
+}
+
+static int lpc32xx_ooblayout_free(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	if (section > 1)
+		return -ERANGE;
+
+	if (!section) {
+		oobregion->offset = 0;
+		oobregion->length = 4;
+	} else {
+		oobregion->offset = 6;
+		oobregion->length = 4;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops lpc32xx_ooblayout_ops = {
+	.ecc = lpc32xx_ooblayout_ecc,
+	.free = lpc32xx_ooblayout_free,
 };
 
 static u8 bbt_pattern[] = {'B', 'b', 't', '0' };
@@ -886,7 +911,7 @@ static int lpc32xx_nand_probe(struct platform_device *pdev)
 	 * custom BBT marker layout.
 	 */
 	if (mtd->writesize <= 512)
-		chip->ecc.layout = &lpc32xx_nand_oob_16;
+		mtd_set_ooblayout(mtd, &lpc32xx_ooblayout_ops);
 
 	/* These sizes remain the same regardless of page size */
 	chip->ecc.size = 256;
-- 
2.5.0

[PATCH v5 38/50] mtd: nand: mxc: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/mxc_nand.c | 212 ++++++++++++++++++++++----------------------
 1 file changed, 105 insertions(+), 107 deletions(-)

diff --git a/drivers/mtd/nand/mxc_nand.c b/drivers/mtd/nand/mxc_nand.c
index 854c832..628f834 100644
--- a/drivers/mtd/nand/mxc_nand.c
+++ b/drivers/mtd/nand/mxc_nand.c
@@ -149,7 +149,7 @@ struct mxc_nand_devtype_data {
 	int (*check_int)(struct mxc_nand_host *);
 	void (*irq_control)(struct mxc_nand_host *, int);
 	u32 (*get_ecc_status)(struct mxc_nand_host *);
-	struct nand_ecclayout *ecclayout_512, *ecclayout_2k, *ecclayout_4k;
+	const struct mtd_ooblayout_ops *ooblayout;
 	void (*select_chip)(struct mtd_info *mtd, int chip);
 	int (*correct_data)(struct mtd_info *mtd, u_char *dat,
 			u_char *read_ecc, u_char *calc_ecc);
@@ -200,73 +200,6 @@ struct mxc_nand_host {
 	struct mxc_nand_platform_data pdata;
 };
 
-/* OOB placement block for use with hardware ecc generation */
-static struct nand_ecclayout nandv1_hw_eccoob_smallpage = {
-	.eccbytes = 5,
-	.eccpos = {6, 7, 8, 9, 10},
-	.oobfree = {{0, 5}, {12, 4}, }
-};
-
-static struct nand_ecclayout nandv1_hw_eccoob_largepage = {
-	.eccbytes = 20,
-	.eccpos = {6, 7, 8, 9, 10, 22, 23, 24, 25, 26,
-		   38, 39, 40, 41, 42, 54, 55, 56, 57, 58},
-	.oobfree = {{2, 4}, {11, 10}, {27, 10}, {43, 10}, {59, 5}, }
-};
-
-/* OOB description for 512 byte pages with 16 byte OOB */
-static struct nand_ecclayout nandv2_hw_eccoob_smallpage = {
-	.eccbytes = 1 * 9,
-	.eccpos = {
-		 7,  8,  9, 10, 11, 12, 13, 14, 15
-	},
-	.oobfree = {
-		{.offset = 0, .length = 5}
-	}
-};
-
-/* OOB description for 2048 byte pages with 64 byte OOB */
-static struct nand_ecclayout nandv2_hw_eccoob_largepage = {
-	.eccbytes = 4 * 9,
-	.eccpos = {
-		 7,  8,  9, 10, 11, 12, 13, 14, 15,
-		23, 24, 25, 26, 27, 28, 29, 30, 31,
-		39, 40, 41, 42, 43, 44, 45, 46, 47,
-		55, 56, 57, 58, 59, 60, 61, 62, 63
-	},
-	.oobfree = {
-		{.offset = 2, .length = 4},
-		{.offset = 16, .length = 7},
-		{.offset = 32, .length = 7},
-		{.offset = 48, .length = 7}
-	}
-};
-
-/* OOB description for 4096 byte pages with 128 byte OOB */
-static struct nand_ecclayout nandv2_hw_eccoob_4k = {
-	.eccbytes = 8 * 9,
-	.eccpos = {
-		7,  8,  9, 10, 11, 12, 13, 14, 15,
-		23, 24, 25, 26, 27, 28, 29, 30, 31,
-		39, 40, 41, 42, 43, 44, 45, 46, 47,
-		55, 56, 57, 58, 59, 60, 61, 62, 63,
-		71, 72, 73, 74, 75, 76, 77, 78, 79,
-		87, 88, 89, 90, 91, 92, 93, 94, 95,
-		103, 104, 105, 106, 107, 108, 109, 110, 111,
-		119, 120, 121, 122, 123, 124, 125, 126, 127,
-	},
-	.oobfree = {
-		{.offset = 2, .length = 4},
-		{.offset = 16, .length = 7},
-		{.offset = 32, .length = 7},
-		{.offset = 48, .length = 7},
-		{.offset = 64, .length = 7},
-		{.offset = 80, .length = 7},
-		{.offset = 96, .length = 7},
-		{.offset = 112, .length = 7},
-	}
-};
-
 static const char * const part_probes[] = {
 	"cmdlinepart", "RedBoot", "ofpart", NULL };
 
@@ -942,6 +875,99 @@ static void mxc_do_addr_cycle(struct mtd_info *mtd, int column, int page_addr)
 	}
 }
 
+static int mxc_v1_ooblayout_ecc(struct mtd_info *mtd, int section,
+				struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *nand_chip = mtd_to_nand(mtd);
+
+	if (section >= nand_chip->ecc.steps)
+		return -ERANGE;
+
+	oobregion->offset = (section * 16) + 6;
+	oobregion->length = nand_chip->ecc.bytes;
+
+	return 0;
+}
+
+static int mxc_v1_ooblayout_free(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *nand_chip = mtd_to_nand(mtd);
+
+	if (section > nand_chip->ecc.steps)
+		return -ERANGE;
+
+	if (!section) {
+		if (mtd->writesize <= 512) {
+			oobregion->offset = 0;
+			oobregion->length = 5;
+		} else {
+			oobregion->offset = 2;
+			oobregion->length = 4;
+		}
+	} else {
+		oobregion->offset = ((section - 1) * 16) +
+				    nand_chip->ecc.bytes + 6;
+		if (section < nand_chip->ecc.steps)
+			oobregion->length = (section * 16) + 6 -
+					    oobregion->offset;
+		else
+			oobregion->length = mtd->oobsize - oobregion->offset;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops mxc_v1_ooblayout_ops = {
+	.ecc = mxc_v1_ooblayout_ecc,
+	.free = mxc_v1_ooblayout_free,
+};
+
+static int mxc_v2_ooblayout_ecc(struct mtd_info *mtd, int section,
+				struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *nand_chip = mtd_to_nand(mtd);
+	int stepsize = nand_chip->ecc.bytes == 9 ? 16 : 26;
+
+	if (section >= nand_chip->ecc.steps)
+		return -ERANGE;
+
+	oobregion->offset = (section * stepsize) + 7;
+	oobregion->length = nand_chip->ecc.bytes;
+
+	return 0;
+}
+
+static int mxc_v2_ooblayout_free(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *nand_chip = mtd_to_nand(mtd);
+	int stepsize = nand_chip->ecc.bytes == 9 ? 16 : 26;
+
+	if (section > nand_chip->ecc.steps)
+		return -ERANGE;
+
+	if (!section) {
+		if (mtd->writesize <= 512) {
+			oobregion->offset = 0;
+			oobregion->length = 5;
+		} else {
+			oobregion->offset = 2;
+			oobregion->length = 4;
+		}
+	} else {
+		oobregion->offset = section * stepsize;
+		oobregion->length = 7;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops mxc_v2_ooblayout_ops = {
+	.ecc = mxc_v2_ooblayout_ecc,
+	.free = mxc_v2_ooblayout_free,
+};
+
 /*
  * v2 and v3 type controllers can do 4bit or 8bit ecc depending
  * on how much oob the nand chip has. For 8bit ecc we need at least
@@ -959,23 +985,6 @@ static int get_eccsize(struct mtd_info *mtd)
 		return 8;
 }
 
-static void ecc_8bit_layout_4k(struct nand_ecclayout *layout)
-{
-	int i, j;
-
-	layout->eccbytes = 8*18;
-	for (i = 0; i < 8; i++)
-		for (j = 0; j < 18; j++)
-			layout->eccpos[i*18 + j] = i*26 + j + 7;
-
-	layout->oobfree[0].offset = 2;
-	layout->oobfree[0].length = 4;
-	for (i = 1; i < 8; i++) {
-		layout->oobfree[i].offset = i*26;
-		layout->oobfree[i].length = 7;
-	}
-}
-
 static void preset_v1(struct mtd_info *mtd)
 {
 	struct nand_chip *nand_chip = mtd_to_nand(mtd);
@@ -1269,9 +1278,7 @@ static const struct mxc_nand_devtype_data imx21_nand_devtype_data = {
 	.check_int = check_int_v1_v2,
 	.irq_control = irq_control_v1_v2,
 	.get_ecc_status = get_ecc_status_v1,
-	.ecclayout_512 = &nandv1_hw_eccoob_smallpage,
-	.ecclayout_2k = &nandv1_hw_eccoob_largepage,
-	.ecclayout_4k = &nandv1_hw_eccoob_smallpage, /* XXX: needs fix */
+	.ooblayout = &mxc_v1_ooblayout_ops,
 	.select_chip = mxc_nand_select_chip_v1_v3,
 	.correct_data = mxc_nand_correct_data_v1,
 	.irqpending_quirk = 1,
@@ -1294,9 +1301,7 @@ static const struct mxc_nand_devtype_data imx27_nand_devtype_data = {
 	.check_int = check_int_v1_v2,
 	.irq_control = irq_control_v1_v2,
 	.get_ecc_status = get_ecc_status_v1,
-	.ecclayout_512 = &nandv1_hw_eccoob_smallpage,
-	.ecclayout_2k = &nandv1_hw_eccoob_largepage,
-	.ecclayout_4k = &nandv1_hw_eccoob_smallpage, /* XXX: needs fix */
+	.ooblayout = &mxc_v1_ooblayout_ops,
 	.select_chip = mxc_nand_select_chip_v1_v3,
 	.correct_data = mxc_nand_correct_data_v1,
 	.irqpending_quirk = 0,
@@ -1320,9 +1325,7 @@ static const struct mxc_nand_devtype_data imx25_nand_devtype_data = {
 	.check_int = check_int_v1_v2,
 	.irq_control = irq_control_v1_v2,
 	.get_ecc_status = get_ecc_status_v2,
-	.ecclayout_512 = &nandv2_hw_eccoob_smallpage,
-	.ecclayout_2k = &nandv2_hw_eccoob_largepage,
-	.ecclayout_4k = &nandv2_hw_eccoob_4k,
+	.ooblayout = &mxc_v2_ooblayout_ops,
 	.select_chip = mxc_nand_select_chip_v2,
 	.correct_data = mxc_nand_correct_data_v2_v3,
 	.irqpending_quirk = 0,
@@ -1346,9 +1349,7 @@ static const struct mxc_nand_devtype_data imx51_nand_devtype_data = {
 	.check_int = check_int_v3,
 	.irq_control = irq_control_v3,
 	.get_ecc_status = get_ecc_status_v3,
-	.ecclayout_512 = &nandv2_hw_eccoob_smallpage,
-	.ecclayout_2k = &nandv2_hw_eccoob_largepage,
-	.ecclayout_4k = &nandv2_hw_eccoob_smallpage, /* XXX: needs fix */
+	.ooblayout = &mxc_v2_ooblayout_ops,
 	.select_chip = mxc_nand_select_chip_v1_v3,
 	.correct_data = mxc_nand_correct_data_v2_v3,
 	.irqpending_quirk = 0,
@@ -1373,9 +1374,7 @@ static const struct mxc_nand_devtype_data imx53_nand_devtype_data = {
 	.check_int = check_int_v3,
 	.irq_control = irq_control_v3,
 	.get_ecc_status = get_ecc_status_v3,
-	.ecclayout_512 = &nandv2_hw_eccoob_smallpage,
-	.ecclayout_2k = &nandv2_hw_eccoob_largepage,
-	.ecclayout_4k = &nandv2_hw_eccoob_smallpage, /* XXX: needs fix */
+	.ooblayout = &mxc_v2_ooblayout_ops,
 	.select_chip = mxc_nand_select_chip_v1_v3,
 	.correct_data = mxc_nand_correct_data_v2_v3,
 	.irqpending_quirk = 0,
@@ -1576,7 +1575,7 @@ static int mxcnd_probe(struct platform_device *pdev)
 
 	this->select_chip = host->devtype_data->select_chip;
 	this->ecc.size = 512;
-	this->ecc.layout = host->devtype_data->ecclayout_512;
+	mtd_set_ooblayout(mtd, host->devtype_data->ooblayout);
 
 	if (host->pdata.hw_ecc) {
 		this->ecc.calculate = mxc_nand_calculate_ecc;
@@ -1649,12 +1648,11 @@ static int mxcnd_probe(struct platform_device *pdev)
 	/* Call preset again, with correct writesize this time */
 	host->devtype_data->preset(mtd);
 
-	if (mtd->writesize == 2048)
-		this->ecc.layout = host->devtype_data->ecclayout_2k;
-	else if (mtd->writesize == 4096) {
-		this->ecc.layout = host->devtype_data->ecclayout_4k;
-		if (get_eccsize(mtd) == 8)
-			ecc_8bit_layout_4k(this->ecc.layout);
+	if (!this->ecc.bytes) {
+		if (host->eccsize == 8)
+			this->ecc.bytes = 18;
+		else if (host->eccsize == 4)
+			this->ecc.bytes = 9;
 	}
 
 	/*
-- 
2.5.0

[PATCH v5 38/50] mtd: nand: mxc: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/mtd/nand/mxc_nand.c | 212 ++++++++++++++++++++++----------------------
 1 file changed, 105 insertions(+), 107 deletions(-)

diff --git a/drivers/mtd/nand/mxc_nand.c b/drivers/mtd/nand/mxc_nand.c
index 854c832..628f834 100644
--- a/drivers/mtd/nand/mxc_nand.c
+++ b/drivers/mtd/nand/mxc_nand.c
@@ -149,7 +149,7 @@ struct mxc_nand_devtype_data {
 	int (*check_int)(struct mxc_nand_host *);
 	void (*irq_control)(struct mxc_nand_host *, int);
 	u32 (*get_ecc_status)(struct mxc_nand_host *);
-	struct nand_ecclayout *ecclayout_512, *ecclayout_2k, *ecclayout_4k;
+	const struct mtd_ooblayout_ops *ooblayout;
 	void (*select_chip)(struct mtd_info *mtd, int chip);
 	int (*correct_data)(struct mtd_info *mtd, u_char *dat,
 			u_char *read_ecc, u_char *calc_ecc);
@@ -200,73 +200,6 @@ struct mxc_nand_host {
 	struct mxc_nand_platform_data pdata;
 };
 
-/* OOB placement block for use with hardware ecc generation */
-static struct nand_ecclayout nandv1_hw_eccoob_smallpage = {
-	.eccbytes = 5,
-	.eccpos = {6, 7, 8, 9, 10},
-	.oobfree = {{0, 5}, {12, 4}, }
-};
-
-static struct nand_ecclayout nandv1_hw_eccoob_largepage = {
-	.eccbytes = 20,
-	.eccpos = {6, 7, 8, 9, 10, 22, 23, 24, 25, 26,
-		   38, 39, 40, 41, 42, 54, 55, 56, 57, 58},
-	.oobfree = {{2, 4}, {11, 10}, {27, 10}, {43, 10}, {59, 5}, }
-};
-
-/* OOB description for 512 byte pages with 16 byte OOB */
-static struct nand_ecclayout nandv2_hw_eccoob_smallpage = {
-	.eccbytes = 1 * 9,
-	.eccpos = {
-		 7,  8,  9, 10, 11, 12, 13, 14, 15
-	},
-	.oobfree = {
-		{.offset = 0, .length = 5}
-	}
-};
-
-/* OOB description for 2048 byte pages with 64 byte OOB */
-static struct nand_ecclayout nandv2_hw_eccoob_largepage = {
-	.eccbytes = 4 * 9,
-	.eccpos = {
-		 7,  8,  9, 10, 11, 12, 13, 14, 15,
-		23, 24, 25, 26, 27, 28, 29, 30, 31,
-		39, 40, 41, 42, 43, 44, 45, 46, 47,
-		55, 56, 57, 58, 59, 60, 61, 62, 63
-	},
-	.oobfree = {
-		{.offset = 2, .length = 4},
-		{.offset = 16, .length = 7},
-		{.offset = 32, .length = 7},
-		{.offset = 48, .length = 7}
-	}
-};
-
-/* OOB description for 4096 byte pages with 128 byte OOB */
-static struct nand_ecclayout nandv2_hw_eccoob_4k = {
-	.eccbytes = 8 * 9,
-	.eccpos = {
-		7,  8,  9, 10, 11, 12, 13, 14, 15,
-		23, 24, 25, 26, 27, 28, 29, 30, 31,
-		39, 40, 41, 42, 43, 44, 45, 46, 47,
-		55, 56, 57, 58, 59, 60, 61, 62, 63,
-		71, 72, 73, 74, 75, 76, 77, 78, 79,
-		87, 88, 89, 90, 91, 92, 93, 94, 95,
-		103, 104, 105, 106, 107, 108, 109, 110, 111,
-		119, 120, 121, 122, 123, 124, 125, 126, 127,
-	},
-	.oobfree = {
-		{.offset = 2, .length = 4},
-		{.offset = 16, .length = 7},
-		{.offset = 32, .length = 7},
-		{.offset = 48, .length = 7},
-		{.offset = 64, .length = 7},
-		{.offset = 80, .length = 7},
-		{.offset = 96, .length = 7},
-		{.offset = 112, .length = 7},
-	}
-};
-
 static const char * const part_probes[] = {
 	"cmdlinepart", "RedBoot", "ofpart", NULL };
 
@@ -942,6 +875,99 @@ static void mxc_do_addr_cycle(struct mtd_info *mtd, int column, int page_addr)
 	}
 }
 
+static int mxc_v1_ooblayout_ecc(struct mtd_info *mtd, int section,
+				struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *nand_chip = mtd_to_nand(mtd);
+
+	if (section >= nand_chip->ecc.steps)
+		return -ERANGE;
+
+	oobregion->offset = (section * 16) + 6;
+	oobregion->length = nand_chip->ecc.bytes;
+
+	return 0;
+}
+
+static int mxc_v1_ooblayout_free(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *nand_chip = mtd_to_nand(mtd);
+
+	if (section > nand_chip->ecc.steps)
+		return -ERANGE;
+
+	if (!section) {
+		if (mtd->writesize <= 512) {
+			oobregion->offset = 0;
+			oobregion->length = 5;
+		} else {
+			oobregion->offset = 2;
+			oobregion->length = 4;
+		}
+	} else {
+		oobregion->offset = ((section - 1) * 16) +
+				    nand_chip->ecc.bytes + 6;
+		if (section < nand_chip->ecc.steps)
+			oobregion->length = (section * 16) + 6 -
+					    oobregion->offset;
+		else
+			oobregion->length = mtd->oobsize - oobregion->offset;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops mxc_v1_ooblayout_ops = {
+	.ecc = mxc_v1_ooblayout_ecc,
+	.free = mxc_v1_ooblayout_free,
+};
+
+static int mxc_v2_ooblayout_ecc(struct mtd_info *mtd, int section,
+				struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *nand_chip = mtd_to_nand(mtd);
+	int stepsize = nand_chip->ecc.bytes == 9 ? 16 : 26;
+
+	if (section >= nand_chip->ecc.steps)
+		return -ERANGE;
+
+	oobregion->offset = (section * stepsize) + 7;
+	oobregion->length = nand_chip->ecc.bytes;
+
+	return 0;
+}
+
+static int mxc_v2_ooblayout_free(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *nand_chip = mtd_to_nand(mtd);
+	int stepsize = nand_chip->ecc.bytes == 9 ? 16 : 26;
+
+	if (section > nand_chip->ecc.steps)
+		return -ERANGE;
+
+	if (!section) {
+		if (mtd->writesize <= 512) {
+			oobregion->offset = 0;
+			oobregion->length = 5;
+		} else {
+			oobregion->offset = 2;
+			oobregion->length = 4;
+		}
+	} else {
+		oobregion->offset = section * stepsize;
+		oobregion->length = 7;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops mxc_v2_ooblayout_ops = {
+	.ecc = mxc_v2_ooblayout_ecc,
+	.free = mxc_v2_ooblayout_free,
+};
+
 /*
  * v2 and v3 type controllers can do 4bit or 8bit ecc depending
  * on how much oob the nand chip has. For 8bit ecc we need at least
@@ -959,23 +985,6 @@ static int get_eccsize(struct mtd_info *mtd)
 		return 8;
 }
 
-static void ecc_8bit_layout_4k(struct nand_ecclayout *layout)
-{
-	int i, j;
-
-	layout->eccbytes = 8*18;
-	for (i = 0; i < 8; i++)
-		for (j = 0; j < 18; j++)
-			layout->eccpos[i*18 + j] = i*26 + j + 7;
-
-	layout->oobfree[0].offset = 2;
-	layout->oobfree[0].length = 4;
-	for (i = 1; i < 8; i++) {
-		layout->oobfree[i].offset = i*26;
-		layout->oobfree[i].length = 7;
-	}
-}
-
 static void preset_v1(struct mtd_info *mtd)
 {
 	struct nand_chip *nand_chip = mtd_to_nand(mtd);
@@ -1269,9 +1278,7 @@ static const struct mxc_nand_devtype_data imx21_nand_devtype_data = {
 	.check_int = check_int_v1_v2,
 	.irq_control = irq_control_v1_v2,
 	.get_ecc_status = get_ecc_status_v1,
-	.ecclayout_512 = &nandv1_hw_eccoob_smallpage,
-	.ecclayout_2k = &nandv1_hw_eccoob_largepage,
-	.ecclayout_4k = &nandv1_hw_eccoob_smallpage, /* XXX: needs fix */
+	.ooblayout = &mxc_v1_ooblayout_ops,
 	.select_chip = mxc_nand_select_chip_v1_v3,
 	.correct_data = mxc_nand_correct_data_v1,
 	.irqpending_quirk = 1,
@@ -1294,9 +1301,7 @@ static const struct mxc_nand_devtype_data imx27_nand_devtype_data = {
 	.check_int = check_int_v1_v2,
 	.irq_control = irq_control_v1_v2,
 	.get_ecc_status = get_ecc_status_v1,
-	.ecclayout_512 = &nandv1_hw_eccoob_smallpage,
-	.ecclayout_2k = &nandv1_hw_eccoob_largepage,
-	.ecclayout_4k = &nandv1_hw_eccoob_smallpage, /* XXX: needs fix */
+	.ooblayout = &mxc_v1_ooblayout_ops,
 	.select_chip = mxc_nand_select_chip_v1_v3,
 	.correct_data = mxc_nand_correct_data_v1,
 	.irqpending_quirk = 0,
@@ -1320,9 +1325,7 @@ static const struct mxc_nand_devtype_data imx25_nand_devtype_data = {
 	.check_int = check_int_v1_v2,
 	.irq_control = irq_control_v1_v2,
 	.get_ecc_status = get_ecc_status_v2,
-	.ecclayout_512 = &nandv2_hw_eccoob_smallpage,
-	.ecclayout_2k = &nandv2_hw_eccoob_largepage,
-	.ecclayout_4k = &nandv2_hw_eccoob_4k,
+	.ooblayout = &mxc_v2_ooblayout_ops,
 	.select_chip = mxc_nand_select_chip_v2,
 	.correct_data = mxc_nand_correct_data_v2_v3,
 	.irqpending_quirk = 0,
@@ -1346,9 +1349,7 @@ static const struct mxc_nand_devtype_data imx51_nand_devtype_data = {
 	.check_int = check_int_v3,
 	.irq_control = irq_control_v3,
 	.get_ecc_status = get_ecc_status_v3,
-	.ecclayout_512 = &nandv2_hw_eccoob_smallpage,
-	.ecclayout_2k = &nandv2_hw_eccoob_largepage,
-	.ecclayout_4k = &nandv2_hw_eccoob_smallpage, /* XXX: needs fix */
+	.ooblayout = &mxc_v2_ooblayout_ops,
 	.select_chip = mxc_nand_select_chip_v1_v3,
 	.correct_data = mxc_nand_correct_data_v2_v3,
 	.irqpending_quirk = 0,
@@ -1373,9 +1374,7 @@ static const struct mxc_nand_devtype_data imx53_nand_devtype_data = {
 	.check_int = check_int_v3,
 	.irq_control = irq_control_v3,
 	.get_ecc_status = get_ecc_status_v3,
-	.ecclayout_512 = &nandv2_hw_eccoob_smallpage,
-	.ecclayout_2k = &nandv2_hw_eccoob_largepage,
-	.ecclayout_4k = &nandv2_hw_eccoob_smallpage, /* XXX: needs fix */
+	.ooblayout = &mxc_v2_ooblayout_ops,
 	.select_chip = mxc_nand_select_chip_v1_v3,
 	.correct_data = mxc_nand_correct_data_v2_v3,
 	.irqpending_quirk = 0,
@@ -1576,7 +1575,7 @@ static int mxcnd_probe(struct platform_device *pdev)
 
 	this->select_chip = host->devtype_data->select_chip;
 	this->ecc.size = 512;
-	this->ecc.layout = host->devtype_data->ecclayout_512;
+	mtd_set_ooblayout(mtd, host->devtype_data->ooblayout);
 
 	if (host->pdata.hw_ecc) {
 		this->ecc.calculate = mxc_nand_calculate_ecc;
@@ -1649,12 +1648,11 @@ static int mxcnd_probe(struct platform_device *pdev)
 	/* Call preset again, with correct writesize this time */
 	host->devtype_data->preset(mtd);
 
-	if (mtd->writesize == 2048)
-		this->ecc.layout = host->devtype_data->ecclayout_2k;
-	else if (mtd->writesize == 4096) {
-		this->ecc.layout = host->devtype_data->ecclayout_4k;
-		if (get_eccsize(mtd) == 8)
-			ecc_8bit_layout_4k(this->ecc.layout);
+	if (!this->ecc.bytes) {
+		if (host->eccsize == 8)
+			this->ecc.bytes = 18;
+		else if (host->eccsize == 4)
+			this->ecc.bytes = 9;
 	}
 
 	/*
-- 
2.5.0

[PATCH v5 38/50] mtd: nand: mxc: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/mxc_nand.c | 212 ++++++++++++++++++++++----------------------
 1 file changed, 105 insertions(+), 107 deletions(-)

diff --git a/drivers/mtd/nand/mxc_nand.c b/drivers/mtd/nand/mxc_nand.c
index 854c832..628f834 100644
--- a/drivers/mtd/nand/mxc_nand.c
+++ b/drivers/mtd/nand/mxc_nand.c
@@ -149,7 +149,7 @@ struct mxc_nand_devtype_data {
 	int (*check_int)(struct mxc_nand_host *);
 	void (*irq_control)(struct mxc_nand_host *, int);
 	u32 (*get_ecc_status)(struct mxc_nand_host *);
-	struct nand_ecclayout *ecclayout_512, *ecclayout_2k, *ecclayout_4k;
+	const struct mtd_ooblayout_ops *ooblayout;
 	void (*select_chip)(struct mtd_info *mtd, int chip);
 	int (*correct_data)(struct mtd_info *mtd, u_char *dat,
 			u_char *read_ecc, u_char *calc_ecc);
@@ -200,73 +200,6 @@ struct mxc_nand_host {
 	struct mxc_nand_platform_data pdata;
 };
 
-/* OOB placement block for use with hardware ecc generation */
-static struct nand_ecclayout nandv1_hw_eccoob_smallpage = {
-	.eccbytes = 5,
-	.eccpos = {6, 7, 8, 9, 10},
-	.oobfree = {{0, 5}, {12, 4}, }
-};
-
-static struct nand_ecclayout nandv1_hw_eccoob_largepage = {
-	.eccbytes = 20,
-	.eccpos = {6, 7, 8, 9, 10, 22, 23, 24, 25, 26,
-		   38, 39, 40, 41, 42, 54, 55, 56, 57, 58},
-	.oobfree = {{2, 4}, {11, 10}, {27, 10}, {43, 10}, {59, 5}, }
-};
-
-/* OOB description for 512 byte pages with 16 byte OOB */
-static struct nand_ecclayout nandv2_hw_eccoob_smallpage = {
-	.eccbytes = 1 * 9,
-	.eccpos = {
-		 7,  8,  9, 10, 11, 12, 13, 14, 15
-	},
-	.oobfree = {
-		{.offset = 0, .length = 5}
-	}
-};
-
-/* OOB description for 2048 byte pages with 64 byte OOB */
-static struct nand_ecclayout nandv2_hw_eccoob_largepage = {
-	.eccbytes = 4 * 9,
-	.eccpos = {
-		 7,  8,  9, 10, 11, 12, 13, 14, 15,
-		23, 24, 25, 26, 27, 28, 29, 30, 31,
-		39, 40, 41, 42, 43, 44, 45, 46, 47,
-		55, 56, 57, 58, 59, 60, 61, 62, 63
-	},
-	.oobfree = {
-		{.offset = 2, .length = 4},
-		{.offset = 16, .length = 7},
-		{.offset = 32, .length = 7},
-		{.offset = 48, .length = 7}
-	}
-};
-
-/* OOB description for 4096 byte pages with 128 byte OOB */
-static struct nand_ecclayout nandv2_hw_eccoob_4k = {
-	.eccbytes = 8 * 9,
-	.eccpos = {
-		7,  8,  9, 10, 11, 12, 13, 14, 15,
-		23, 24, 25, 26, 27, 28, 29, 30, 31,
-		39, 40, 41, 42, 43, 44, 45, 46, 47,
-		55, 56, 57, 58, 59, 60, 61, 62, 63,
-		71, 72, 73, 74, 75, 76, 77, 78, 79,
-		87, 88, 89, 90, 91, 92, 93, 94, 95,
-		103, 104, 105, 106, 107, 108, 109, 110, 111,
-		119, 120, 121, 122, 123, 124, 125, 126, 127,
-	},
-	.oobfree = {
-		{.offset = 2, .length = 4},
-		{.offset = 16, .length = 7},
-		{.offset = 32, .length = 7},
-		{.offset = 48, .length = 7},
-		{.offset = 64, .length = 7},
-		{.offset = 80, .length = 7},
-		{.offset = 96, .length = 7},
-		{.offset = 112, .length = 7},
-	}
-};
-
 static const char * const part_probes[] = {
 	"cmdlinepart", "RedBoot", "ofpart", NULL };
 
@@ -942,6 +875,99 @@ static void mxc_do_addr_cycle(struct mtd_info *mtd, int column, int page_addr)
 	}
 }
 
+static int mxc_v1_ooblayout_ecc(struct mtd_info *mtd, int section,
+				struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *nand_chip = mtd_to_nand(mtd);
+
+	if (section >= nand_chip->ecc.steps)
+		return -ERANGE;
+
+	oobregion->offset = (section * 16) + 6;
+	oobregion->length = nand_chip->ecc.bytes;
+
+	return 0;
+}
+
+static int mxc_v1_ooblayout_free(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *nand_chip = mtd_to_nand(mtd);
+
+	if (section > nand_chip->ecc.steps)
+		return -ERANGE;
+
+	if (!section) {
+		if (mtd->writesize <= 512) {
+			oobregion->offset = 0;
+			oobregion->length = 5;
+		} else {
+			oobregion->offset = 2;
+			oobregion->length = 4;
+		}
+	} else {
+		oobregion->offset = ((section - 1) * 16) +
+				    nand_chip->ecc.bytes + 6;
+		if (section < nand_chip->ecc.steps)
+			oobregion->length = (section * 16) + 6 -
+					    oobregion->offset;
+		else
+			oobregion->length = mtd->oobsize - oobregion->offset;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops mxc_v1_ooblayout_ops = {
+	.ecc = mxc_v1_ooblayout_ecc,
+	.free = mxc_v1_ooblayout_free,
+};
+
+static int mxc_v2_ooblayout_ecc(struct mtd_info *mtd, int section,
+				struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *nand_chip = mtd_to_nand(mtd);
+	int stepsize = nand_chip->ecc.bytes == 9 ? 16 : 26;
+
+	if (section >= nand_chip->ecc.steps)
+		return -ERANGE;
+
+	oobregion->offset = (section * stepsize) + 7;
+	oobregion->length = nand_chip->ecc.bytes;
+
+	return 0;
+}
+
+static int mxc_v2_ooblayout_free(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *nand_chip = mtd_to_nand(mtd);
+	int stepsize = nand_chip->ecc.bytes == 9 ? 16 : 26;
+
+	if (section > nand_chip->ecc.steps)
+		return -ERANGE;
+
+	if (!section) {
+		if (mtd->writesize <= 512) {
+			oobregion->offset = 0;
+			oobregion->length = 5;
+		} else {
+			oobregion->offset = 2;
+			oobregion->length = 4;
+		}
+	} else {
+		oobregion->offset = section * stepsize;
+		oobregion->length = 7;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops mxc_v2_ooblayout_ops = {
+	.ecc = mxc_v2_ooblayout_ecc,
+	.free = mxc_v2_ooblayout_free,
+};
+
 /*
  * v2 and v3 type controllers can do 4bit or 8bit ecc depending
  * on how much oob the nand chip has. For 8bit ecc we need at least
@@ -959,23 +985,6 @@ static int get_eccsize(struct mtd_info *mtd)
 		return 8;
 }
 
-static void ecc_8bit_layout_4k(struct nand_ecclayout *layout)
-{
-	int i, j;
-
-	layout->eccbytes = 8*18;
-	for (i = 0; i < 8; i++)
-		for (j = 0; j < 18; j++)
-			layout->eccpos[i*18 + j] = i*26 + j + 7;
-
-	layout->oobfree[0].offset = 2;
-	layout->oobfree[0].length = 4;
-	for (i = 1; i < 8; i++) {
-		layout->oobfree[i].offset = i*26;
-		layout->oobfree[i].length = 7;
-	}
-}
-
 static void preset_v1(struct mtd_info *mtd)
 {
 	struct nand_chip *nand_chip = mtd_to_nand(mtd);
@@ -1269,9 +1278,7 @@ static const struct mxc_nand_devtype_data imx21_nand_devtype_data = {
 	.check_int = check_int_v1_v2,
 	.irq_control = irq_control_v1_v2,
 	.get_ecc_status = get_ecc_status_v1,
-	.ecclayout_512 = &nandv1_hw_eccoob_smallpage,
-	.ecclayout_2k = &nandv1_hw_eccoob_largepage,
-	.ecclayout_4k = &nandv1_hw_eccoob_smallpage, /* XXX: needs fix */
+	.ooblayout = &mxc_v1_ooblayout_ops,
 	.select_chip = mxc_nand_select_chip_v1_v3,
 	.correct_data = mxc_nand_correct_data_v1,
 	.irqpending_quirk = 1,
@@ -1294,9 +1301,7 @@ static const struct mxc_nand_devtype_data imx27_nand_devtype_data = {
 	.check_int = check_int_v1_v2,
 	.irq_control = irq_control_v1_v2,
 	.get_ecc_status = get_ecc_status_v1,
-	.ecclayout_512 = &nandv1_hw_eccoob_smallpage,
-	.ecclayout_2k = &nandv1_hw_eccoob_largepage,
-	.ecclayout_4k = &nandv1_hw_eccoob_smallpage, /* XXX: needs fix */
+	.ooblayout = &mxc_v1_ooblayout_ops,
 	.select_chip = mxc_nand_select_chip_v1_v3,
 	.correct_data = mxc_nand_correct_data_v1,
 	.irqpending_quirk = 0,
@@ -1320,9 +1325,7 @@ static const struct mxc_nand_devtype_data imx25_nand_devtype_data = {
 	.check_int = check_int_v1_v2,
 	.irq_control = irq_control_v1_v2,
 	.get_ecc_status = get_ecc_status_v2,
-	.ecclayout_512 = &nandv2_hw_eccoob_smallpage,
-	.ecclayout_2k = &nandv2_hw_eccoob_largepage,
-	.ecclayout_4k = &nandv2_hw_eccoob_4k,
+	.ooblayout = &mxc_v2_ooblayout_ops,
 	.select_chip = mxc_nand_select_chip_v2,
 	.correct_data = mxc_nand_correct_data_v2_v3,
 	.irqpending_quirk = 0,
@@ -1346,9 +1349,7 @@ static const struct mxc_nand_devtype_data imx51_nand_devtype_data = {
 	.check_int = check_int_v3,
 	.irq_control = irq_control_v3,
 	.get_ecc_status = get_ecc_status_v3,
-	.ecclayout_512 = &nandv2_hw_eccoob_smallpage,
-	.ecclayout_2k = &nandv2_hw_eccoob_largepage,
-	.ecclayout_4k = &nandv2_hw_eccoob_smallpage, /* XXX: needs fix */
+	.ooblayout = &mxc_v2_ooblayout_ops,
 	.select_chip = mxc_nand_select_chip_v1_v3,
 	.correct_data = mxc_nand_correct_data_v2_v3,
 	.irqpending_quirk = 0,
@@ -1373,9 +1374,7 @@ static const struct mxc_nand_devtype_data imx53_nand_devtype_data = {
 	.check_int = check_int_v3,
 	.irq_control = irq_control_v3,
 	.get_ecc_status = get_ecc_status_v3,
-	.ecclayout_512 = &nandv2_hw_eccoob_smallpage,
-	.ecclayout_2k = &nandv2_hw_eccoob_largepage,
-	.ecclayout_4k = &nandv2_hw_eccoob_smallpage, /* XXX: needs fix */
+	.ooblayout = &mxc_v2_ooblayout_ops,
 	.select_chip = mxc_nand_select_chip_v1_v3,
 	.correct_data = mxc_nand_correct_data_v2_v3,
 	.irqpending_quirk = 0,
@@ -1576,7 +1575,7 @@ static int mxcnd_probe(struct platform_device *pdev)
 
 	this->select_chip = host->devtype_data->select_chip;
 	this->ecc.size = 512;
-	this->ecc.layout = host->devtype_data->ecclayout_512;
+	mtd_set_ooblayout(mtd, host->devtype_data->ooblayout);
 
 	if (host->pdata.hw_ecc) {
 		this->ecc.calculate = mxc_nand_calculate_ecc;
@@ -1649,12 +1648,11 @@ static int mxcnd_probe(struct platform_device *pdev)
 	/* Call preset again, with correct writesize this time */
 	host->devtype_data->preset(mtd);
 
-	if (mtd->writesize == 2048)
-		this->ecc.layout = host->devtype_data->ecclayout_2k;
-	else if (mtd->writesize == 4096) {
-		this->ecc.layout = host->devtype_data->ecclayout_4k;
-		if (get_eccsize(mtd) == 8)
-			ecc_8bit_layout_4k(this->ecc.layout);
+	if (!this->ecc.bytes) {
+		if (host->eccsize == 8)
+			this->ecc.bytes = 18;
+		else if (host->eccsize == 4)
+			this->ecc.bytes = 9;
 	}
 
 	/*
-- 
2.5.0

[PATCH v5 39/50] mtd: nand: omap2: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/omap2.c | 194 +++++++++++++++++++++++++++--------------------
 1 file changed, 113 insertions(+), 81 deletions(-)

diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index 4ebf16b..bca154a 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -169,8 +169,6 @@ struct omap_nand_info {
 	u_char				*buf;
 	int					buf_len;
 	struct gpmc_nand_regs		reg;
-	/* generated at runtime depending on ECC algorithm and layout selected */
-	struct nand_ecclayout		oobinfo;
 	/* fields specific for BCHx_HW ECC scheme */
 	struct device			*elm_dev;
 	struct device_node		*of_node;
@@ -1639,19 +1637,108 @@ static bool omap2_nand_ecc_check(struct omap_nand_info *info,
 	return true;
 }
 
+static int omap_ooblayout_ecc(struct mtd_info *mtd, int section,
+			      struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	int off = chip->options & NAND_BUSWIDTH_16 ?
+		  BADBLOCK_MARKER_LENGTH : 1;
+
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = off;
+	oobregion->length = chip->ecc.total;
+
+	return 0;
+}
+
+static int omap_ooblayout_free(struct mtd_info *mtd, int section,
+			       struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	int off = chip->options & NAND_BUSWIDTH_16 ?
+		  BADBLOCK_MARKER_LENGTH : 1;
+
+	if (section)
+		return -ERANGE;
+
+	off += chip->ecc.total;
+	if (off >= mtd->oobsize)
+		return -ERANGE;
+
+	oobregion->offset = off;
+	oobregion->length = mtd->oobsize - off;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops omap_ooblayout_ops = {
+	.ecc = omap_ooblayout_ecc,
+	.free = omap_ooblayout_free,
+};
+
+static int omap_sw_ooblayout_ecc(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	int off = chip->options & NAND_BUSWIDTH_16 ?
+		  BADBLOCK_MARKER_LENGTH : 1;
+
+	if (section >= chip->ecc.steps)
+		return -ERANGE;
+
+	/*
+	 * When SW correction is employed, one OMAP specific marker byte is
+	 * reserved after each ECC step.
+	 */
+	oobregion->offset = off + (section * (chip->ecc.bytes + 1));
+	oobregion->length = chip->ecc.bytes;
+
+	return 0;
+}
+
+static int omap_sw_ooblayout_free(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	int off = chip->options & NAND_BUSWIDTH_16 ?
+		  BADBLOCK_MARKER_LENGTH : 1;
+
+	if (section)
+		return -ERANGE;
+
+	/*
+	 * When SW correction is employed, one OMAP specific marker byte is
+	 * reserved after each ECC step.
+	 */
+	off += ((chip->ecc.bytes + 1) * chip->ecc.steps);
+	if (off >= mtd->oobsize)
+		return -ERANGE;
+
+	oobregion->offset = off;
+	oobregion->length = mtd->oobsize - off;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops omap_sw_ooblayout_ops = {
+	.ecc = omap_sw_ooblayout_ecc,
+	.free = omap_sw_ooblayout_free,
+};
+
 static int omap_nand_probe(struct platform_device *pdev)
 {
 	struct omap_nand_info		*info;
 	struct omap_nand_platform_data	*pdata;
 	struct mtd_info			*mtd;
 	struct nand_chip		*nand_chip;
-	struct nand_ecclayout		*ecclayout;
 	int				err;
-	int				i;
 	dma_cap_mask_t			mask;
 	unsigned			sig;
-	unsigned			oob_index;
 	struct resource			*res;
+	int				min_oobbytes;
+	int				oobbytes_per_step;
 
 	pdata = dev_get_platdata(&pdev->dev);
 	if (pdata == NULL) {
@@ -1810,7 +1897,7 @@ static int omap_nand_probe(struct platform_device *pdev)
 
 	/*
 	 * Bail out earlier to let NAND_ECC_SOFT code create its own
-	 * ecclayout instead of using ours.
+	 * ooblayout instead of using ours.
 	 */
 	if (info->ecc_opt == OMAP_ECC_HAM1_CODE_SW) {
 		nand_chip->ecc.mode = NAND_ECC_SOFT;
@@ -1818,8 +1905,6 @@ static int omap_nand_probe(struct platform_device *pdev)
 	}
 
 	/* populate MTD interface based on ECC scheme */
-	ecclayout		= &info->oobinfo;
-	nand_chip->ecc.layout	= ecclayout;
 	switch (info->ecc_opt) {
 	case OMAP_ECC_HAM1_CODE_HW:
 		pr_info("nand: using OMAP_ECC_HAM1_CODE_HW\n");
@@ -1830,19 +1915,8 @@ static int omap_nand_probe(struct platform_device *pdev)
 		nand_chip->ecc.calculate        = omap_calculate_ecc;
 		nand_chip->ecc.hwctl            = omap_enable_hwecc;
 		nand_chip->ecc.correct          = omap_correct_data;
-		/* define ECC layout */
-		ecclayout->eccbytes		= nand_chip->ecc.bytes *
-							(mtd->writesize /
-							nand_chip->ecc.size);
-		if (nand_chip->options & NAND_BUSWIDTH_16)
-			oob_index		= BADBLOCK_MARKER_LENGTH;
-		else
-			oob_index		= 1;
-		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++)
-			ecclayout->eccpos[i]	= oob_index;
-		/* no reserved-marker in ecclayout for this ecc-scheme */
-		ecclayout->oobfree->offset	=
-				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
+		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
+		oobbytes_per_step		= nand_chip->ecc.bytes;
 		break;
 
 	case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
@@ -1854,19 +1928,9 @@ static int omap_nand_probe(struct platform_device *pdev)
 		nand_chip->ecc.hwctl		= omap_enable_hwecc_bch;
 		nand_chip->ecc.correct		= nand_bch_correct_data;
 		nand_chip->ecc.calculate	= omap_calculate_ecc_bch;
-		/* define ECC layout */
-		ecclayout->eccbytes		= nand_chip->ecc.bytes *
-							(mtd->writesize /
-							nand_chip->ecc.size);
-		oob_index			= BADBLOCK_MARKER_LENGTH;
-		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++) {
-			ecclayout->eccpos[i] = oob_index;
-			if (((i + 1) % nand_chip->ecc.bytes) == 0)
-				oob_index++;
-		}
-		/* include reserved-marker in ecclayout->oobfree calculation */
-		ecclayout->oobfree->offset	= 1 +
-				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
+		mtd_set_ooblayout(mtd, &omap_sw_ooblayout_ops);
+		/* Reserve one byte for the OMAP marker */
+		oobbytes_per_step		= nand_chip->ecc.bytes + 1;
 		/* software bch library is used for locating errors */
 		nand_chip->ecc.priv		= nand_bch_init(mtd);
 		if (!nand_chip->ecc.priv) {
@@ -1888,16 +1952,8 @@ static int omap_nand_probe(struct platform_device *pdev)
 		nand_chip->ecc.calculate	= omap_calculate_ecc_bch;
 		nand_chip->ecc.read_page	= omap_read_page_bch;
 		nand_chip->ecc.write_page	= omap_write_page_bch;
-		/* define ECC layout */
-		ecclayout->eccbytes		= nand_chip->ecc.bytes *
-							(mtd->writesize /
-							nand_chip->ecc.size);
-		oob_index			= BADBLOCK_MARKER_LENGTH;
-		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++)
-			ecclayout->eccpos[i]	= oob_index;
-		/* reserved marker already included in ecclayout->eccbytes */
-		ecclayout->oobfree->offset	=
-				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
+		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
+		oobbytes_per_step		= nand_chip->ecc.bytes;
 
 		err = elm_config(info->elm_dev, BCH4_ECC,
 				 mtd->writesize / nand_chip->ecc.size,
@@ -1915,19 +1971,9 @@ static int omap_nand_probe(struct platform_device *pdev)
 		nand_chip->ecc.hwctl		= omap_enable_hwecc_bch;
 		nand_chip->ecc.correct		= nand_bch_correct_data;
 		nand_chip->ecc.calculate	= omap_calculate_ecc_bch;
-		/* define ECC layout */
-		ecclayout->eccbytes		= nand_chip->ecc.bytes *
-							(mtd->writesize /
-							nand_chip->ecc.size);
-		oob_index			= BADBLOCK_MARKER_LENGTH;
-		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++) {
-			ecclayout->eccpos[i] = oob_index;
-			if (((i + 1) % nand_chip->ecc.bytes) == 0)
-				oob_index++;
-		}
-		/* include reserved-marker in ecclayout->oobfree calculation */
-		ecclayout->oobfree->offset	= 1 +
-				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
+		mtd_set_ooblayout(mtd, &omap_sw_ooblayout_ops);
+		/* Reserve one byte for the OMAP marker */
+		oobbytes_per_step		= nand_chip->ecc.bytes + 1;
 		/* software bch library is used for locating errors */
 		nand_chip->ecc.priv		= nand_bch_init(mtd);
 		if (!nand_chip->ecc.priv) {
@@ -1949,6 +1995,8 @@ static int omap_nand_probe(struct platform_device *pdev)
 		nand_chip->ecc.calculate	= omap_calculate_ecc_bch;
 		nand_chip->ecc.read_page	= omap_read_page_bch;
 		nand_chip->ecc.write_page	= omap_write_page_bch;
+		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
+		oobbytes_per_step		= nand_chip->ecc.bytes;
 
 		err = elm_config(info->elm_dev, BCH8_ECC,
 				 mtd->writesize / nand_chip->ecc.size,
@@ -1956,16 +2004,6 @@ static int omap_nand_probe(struct platform_device *pdev)
 		if (err < 0)
 			goto return_error;
 
-		/* define ECC layout */
-		ecclayout->eccbytes		= nand_chip->ecc.bytes *
-							(mtd->writesize /
-							nand_chip->ecc.size);
-		oob_index			= BADBLOCK_MARKER_LENGTH;
-		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++)
-			ecclayout->eccpos[i]	= oob_index;
-		/* reserved marker already included in ecclayout->eccbytes */
-		ecclayout->oobfree->offset	=
-				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
 		break;
 
 	case OMAP_ECC_BCH16_CODE_HW:
@@ -1979,6 +2017,8 @@ static int omap_nand_probe(struct platform_device *pdev)
 		nand_chip->ecc.calculate	= omap_calculate_ecc_bch;
 		nand_chip->ecc.read_page	= omap_read_page_bch;
 		nand_chip->ecc.write_page	= omap_write_page_bch;
+		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
+		oobbytes_per_step		= nand_chip->ecc.bytes;
 
 		err = elm_config(info->elm_dev, BCH16_ECC,
 				 mtd->writesize / nand_chip->ecc.size,
@@ -1986,16 +2026,6 @@ static int omap_nand_probe(struct platform_device *pdev)
 		if (err < 0)
 			goto return_error;
 
-		/* define ECC layout */
-		ecclayout->eccbytes		= nand_chip->ecc.bytes *
-							(mtd->writesize /
-							nand_chip->ecc.size);
-		oob_index			= BADBLOCK_MARKER_LENGTH;
-		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++)
-			ecclayout->eccpos[i]	= oob_index;
-		/* reserved marker already included in ecclayout->eccbytes */
-		ecclayout->oobfree->offset	=
-				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
 		break;
 	default:
 		dev_err(&info->pdev->dev, "invalid or unsupported ECC scheme\n");
@@ -2003,13 +2033,15 @@ static int omap_nand_probe(struct platform_device *pdev)
 		goto return_error;
 	}
 
-	/* all OOB bytes from oobfree->offset till end off OOB are free */
-	ecclayout->oobfree->length = mtd->oobsize - ecclayout->oobfree->offset;
 	/* check if NAND device's OOB is enough to store ECC signatures */
-	if (mtd->oobsize < (ecclayout->eccbytes + BADBLOCK_MARKER_LENGTH)) {
+	min_oobbytes = (oobbytes_per_step *
+			(mtd->writesize / nand_chip->ecc.size)) +
+		       (nand_chip->options & NAND_BUSWIDTH_16 ?
+			BADBLOCK_MARKER_LENGTH : 1);
+	if (mtd->oobsize < min_oobbytes) {
 		dev_err(&info->pdev->dev,
 			"not enough OOB bytes required = %d, available=%d\n",
-			ecclayout->eccbytes, mtd->oobsize);
+			min_oobbytes, mtd->oobsize);
 		err = -EINVAL;
 		goto return_error;
 	}
-- 
2.5.0

[PATCH v5 39/50] mtd: nand: omap2: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/mtd/nand/omap2.c | 194 +++++++++++++++++++++++++++--------------------
 1 file changed, 113 insertions(+), 81 deletions(-)

diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index 4ebf16b..bca154a 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -169,8 +169,6 @@ struct omap_nand_info {
 	u_char				*buf;
 	int					buf_len;
 	struct gpmc_nand_regs		reg;
-	/* generated at runtime depending on ECC algorithm and layout selected */
-	struct nand_ecclayout		oobinfo;
 	/* fields specific for BCHx_HW ECC scheme */
 	struct device			*elm_dev;
 	struct device_node		*of_node;
@@ -1639,19 +1637,108 @@ static bool omap2_nand_ecc_check(struct omap_nand_info *info,
 	return true;
 }
 
+static int omap_ooblayout_ecc(struct mtd_info *mtd, int section,
+			      struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	int off = chip->options & NAND_BUSWIDTH_16 ?
+		  BADBLOCK_MARKER_LENGTH : 1;
+
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = off;
+	oobregion->length = chip->ecc.total;
+
+	return 0;
+}
+
+static int omap_ooblayout_free(struct mtd_info *mtd, int section,
+			       struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	int off = chip->options & NAND_BUSWIDTH_16 ?
+		  BADBLOCK_MARKER_LENGTH : 1;
+
+	if (section)
+		return -ERANGE;
+
+	off += chip->ecc.total;
+	if (off >= mtd->oobsize)
+		return -ERANGE;
+
+	oobregion->offset = off;
+	oobregion->length = mtd->oobsize - off;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops omap_ooblayout_ops = {
+	.ecc = omap_ooblayout_ecc,
+	.free = omap_ooblayout_free,
+};
+
+static int omap_sw_ooblayout_ecc(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	int off = chip->options & NAND_BUSWIDTH_16 ?
+		  BADBLOCK_MARKER_LENGTH : 1;
+
+	if (section >= chip->ecc.steps)
+		return -ERANGE;
+
+	/*
+	 * When SW correction is employed, one OMAP specific marker byte is
+	 * reserved after each ECC step.
+	 */
+	oobregion->offset = off + (section * (chip->ecc.bytes + 1));
+	oobregion->length = chip->ecc.bytes;
+
+	return 0;
+}
+
+static int omap_sw_ooblayout_free(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	int off = chip->options & NAND_BUSWIDTH_16 ?
+		  BADBLOCK_MARKER_LENGTH : 1;
+
+	if (section)
+		return -ERANGE;
+
+	/*
+	 * When SW correction is employed, one OMAP specific marker byte is
+	 * reserved after each ECC step.
+	 */
+	off += ((chip->ecc.bytes + 1) * chip->ecc.steps);
+	if (off >= mtd->oobsize)
+		return -ERANGE;
+
+	oobregion->offset = off;
+	oobregion->length = mtd->oobsize - off;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops omap_sw_ooblayout_ops = {
+	.ecc = omap_sw_ooblayout_ecc,
+	.free = omap_sw_ooblayout_free,
+};
+
 static int omap_nand_probe(struct platform_device *pdev)
 {
 	struct omap_nand_info		*info;
 	struct omap_nand_platform_data	*pdata;
 	struct mtd_info			*mtd;
 	struct nand_chip		*nand_chip;
-	struct nand_ecclayout		*ecclayout;
 	int				err;
-	int				i;
 	dma_cap_mask_t			mask;
 	unsigned			sig;
-	unsigned			oob_index;
 	struct resource			*res;
+	int				min_oobbytes;
+	int				oobbytes_per_step;
 
 	pdata = dev_get_platdata(&pdev->dev);
 	if (pdata == NULL) {
@@ -1810,7 +1897,7 @@ static int omap_nand_probe(struct platform_device *pdev)
 
 	/*
 	 * Bail out earlier to let NAND_ECC_SOFT code create its own
-	 * ecclayout instead of using ours.
+	 * ooblayout instead of using ours.
 	 */
 	if (info->ecc_opt == OMAP_ECC_HAM1_CODE_SW) {
 		nand_chip->ecc.mode = NAND_ECC_SOFT;
@@ -1818,8 +1905,6 @@ static int omap_nand_probe(struct platform_device *pdev)
 	}
 
 	/* populate MTD interface based on ECC scheme */
-	ecclayout		= &info->oobinfo;
-	nand_chip->ecc.layout	= ecclayout;
 	switch (info->ecc_opt) {
 	case OMAP_ECC_HAM1_CODE_HW:
 		pr_info("nand: using OMAP_ECC_HAM1_CODE_HW\n");
@@ -1830,19 +1915,8 @@ static int omap_nand_probe(struct platform_device *pdev)
 		nand_chip->ecc.calculate        = omap_calculate_ecc;
 		nand_chip->ecc.hwctl            = omap_enable_hwecc;
 		nand_chip->ecc.correct          = omap_correct_data;
-		/* define ECC layout */
-		ecclayout->eccbytes		= nand_chip->ecc.bytes *
-							(mtd->writesize /
-							nand_chip->ecc.size);
-		if (nand_chip->options & NAND_BUSWIDTH_16)
-			oob_index		= BADBLOCK_MARKER_LENGTH;
-		else
-			oob_index		= 1;
-		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++)
-			ecclayout->eccpos[i]	= oob_index;
-		/* no reserved-marker in ecclayout for this ecc-scheme */
-		ecclayout->oobfree->offset	=
-				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
+		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
+		oobbytes_per_step		= nand_chip->ecc.bytes;
 		break;
 
 	case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
@@ -1854,19 +1928,9 @@ static int omap_nand_probe(struct platform_device *pdev)
 		nand_chip->ecc.hwctl		= omap_enable_hwecc_bch;
 		nand_chip->ecc.correct		= nand_bch_correct_data;
 		nand_chip->ecc.calculate	= omap_calculate_ecc_bch;
-		/* define ECC layout */
-		ecclayout->eccbytes		= nand_chip->ecc.bytes *
-							(mtd->writesize /
-							nand_chip->ecc.size);
-		oob_index			= BADBLOCK_MARKER_LENGTH;
-		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++) {
-			ecclayout->eccpos[i] = oob_index;
-			if (((i + 1) % nand_chip->ecc.bytes) == 0)
-				oob_index++;
-		}
-		/* include reserved-marker in ecclayout->oobfree calculation */
-		ecclayout->oobfree->offset	= 1 +
-				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
+		mtd_set_ooblayout(mtd, &omap_sw_ooblayout_ops);
+		/* Reserve one byte for the OMAP marker */
+		oobbytes_per_step		= nand_chip->ecc.bytes + 1;
 		/* software bch library is used for locating errors */
 		nand_chip->ecc.priv		= nand_bch_init(mtd);
 		if (!nand_chip->ecc.priv) {
@@ -1888,16 +1952,8 @@ static int omap_nand_probe(struct platform_device *pdev)
 		nand_chip->ecc.calculate	= omap_calculate_ecc_bch;
 		nand_chip->ecc.read_page	= omap_read_page_bch;
 		nand_chip->ecc.write_page	= omap_write_page_bch;
-		/* define ECC layout */
-		ecclayout->eccbytes		= nand_chip->ecc.bytes *
-							(mtd->writesize /
-							nand_chip->ecc.size);
-		oob_index			= BADBLOCK_MARKER_LENGTH;
-		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++)
-			ecclayout->eccpos[i]	= oob_index;
-		/* reserved marker already included in ecclayout->eccbytes */
-		ecclayout->oobfree->offset	=
-				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
+		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
+		oobbytes_per_step		= nand_chip->ecc.bytes;
 
 		err = elm_config(info->elm_dev, BCH4_ECC,
 				 mtd->writesize / nand_chip->ecc.size,
@@ -1915,19 +1971,9 @@ static int omap_nand_probe(struct platform_device *pdev)
 		nand_chip->ecc.hwctl		= omap_enable_hwecc_bch;
 		nand_chip->ecc.correct		= nand_bch_correct_data;
 		nand_chip->ecc.calculate	= omap_calculate_ecc_bch;
-		/* define ECC layout */
-		ecclayout->eccbytes		= nand_chip->ecc.bytes *
-							(mtd->writesize /
-							nand_chip->ecc.size);
-		oob_index			= BADBLOCK_MARKER_LENGTH;
-		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++) {
-			ecclayout->eccpos[i] = oob_index;
-			if (((i + 1) % nand_chip->ecc.bytes) == 0)
-				oob_index++;
-		}
-		/* include reserved-marker in ecclayout->oobfree calculation */
-		ecclayout->oobfree->offset	= 1 +
-				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
+		mtd_set_ooblayout(mtd, &omap_sw_ooblayout_ops);
+		/* Reserve one byte for the OMAP marker */
+		oobbytes_per_step		= nand_chip->ecc.bytes + 1;
 		/* software bch library is used for locating errors */
 		nand_chip->ecc.priv		= nand_bch_init(mtd);
 		if (!nand_chip->ecc.priv) {
@@ -1949,6 +1995,8 @@ static int omap_nand_probe(struct platform_device *pdev)
 		nand_chip->ecc.calculate	= omap_calculate_ecc_bch;
 		nand_chip->ecc.read_page	= omap_read_page_bch;
 		nand_chip->ecc.write_page	= omap_write_page_bch;
+		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
+		oobbytes_per_step		= nand_chip->ecc.bytes;
 
 		err = elm_config(info->elm_dev, BCH8_ECC,
 				 mtd->writesize / nand_chip->ecc.size,
@@ -1956,16 +2004,6 @@ static int omap_nand_probe(struct platform_device *pdev)
 		if (err < 0)
 			goto return_error;
 
-		/* define ECC layout */
-		ecclayout->eccbytes		= nand_chip->ecc.bytes *
-							(mtd->writesize /
-							nand_chip->ecc.size);
-		oob_index			= BADBLOCK_MARKER_LENGTH;
-		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++)
-			ecclayout->eccpos[i]	= oob_index;
-		/* reserved marker already included in ecclayout->eccbytes */
-		ecclayout->oobfree->offset	=
-				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
 		break;
 
 	case OMAP_ECC_BCH16_CODE_HW:
@@ -1979,6 +2017,8 @@ static int omap_nand_probe(struct platform_device *pdev)
 		nand_chip->ecc.calculate	= omap_calculate_ecc_bch;
 		nand_chip->ecc.read_page	= omap_read_page_bch;
 		nand_chip->ecc.write_page	= omap_write_page_bch;
+		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
+		oobbytes_per_step		= nand_chip->ecc.bytes;
 
 		err = elm_config(info->elm_dev, BCH16_ECC,
 				 mtd->writesize / nand_chip->ecc.size,
@@ -1986,16 +2026,6 @@ static int omap_nand_probe(struct platform_device *pdev)
 		if (err < 0)
 			goto return_error;
 
-		/* define ECC layout */
-		ecclayout->eccbytes		= nand_chip->ecc.bytes *
-							(mtd->writesize /
-							nand_chip->ecc.size);
-		oob_index			= BADBLOCK_MARKER_LENGTH;
-		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++)
-			ecclayout->eccpos[i]	= oob_index;
-		/* reserved marker already included in ecclayout->eccbytes */
-		ecclayout->oobfree->offset	=
-				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
 		break;
 	default:
 		dev_err(&info->pdev->dev, "invalid or unsupported ECC scheme\n");
@@ -2003,13 +2033,15 @@ static int omap_nand_probe(struct platform_device *pdev)
 		goto return_error;
 	}
 
-	/* all OOB bytes from oobfree->offset till end off OOB are free */
-	ecclayout->oobfree->length = mtd->oobsize - ecclayout->oobfree->offset;
 	/* check if NAND device's OOB is enough to store ECC signatures */
-	if (mtd->oobsize < (ecclayout->eccbytes + BADBLOCK_MARKER_LENGTH)) {
+	min_oobbytes = (oobbytes_per_step *
+			(mtd->writesize / nand_chip->ecc.size)) +
+		       (nand_chip->options & NAND_BUSWIDTH_16 ?
+			BADBLOCK_MARKER_LENGTH : 1);
+	if (mtd->oobsize < min_oobbytes) {
 		dev_err(&info->pdev->dev,
 			"not enough OOB bytes required = %d, available=%d\n",
-			ecclayout->eccbytes, mtd->oobsize);
+			min_oobbytes, mtd->oobsize);
 		err = -EINVAL;
 		goto return_error;
 	}
-- 
2.5.0

[PATCH v5 39/50] mtd: nand: omap2: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/omap2.c | 194 +++++++++++++++++++++++++++--------------------
 1 file changed, 113 insertions(+), 81 deletions(-)

diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index 4ebf16b..bca154a 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -169,8 +169,6 @@ struct omap_nand_info {
 	u_char				*buf;
 	int					buf_len;
 	struct gpmc_nand_regs		reg;
-	/* generated at runtime depending on ECC algorithm and layout selected */
-	struct nand_ecclayout		oobinfo;
 	/* fields specific for BCHx_HW ECC scheme */
 	struct device			*elm_dev;
 	struct device_node		*of_node;
@@ -1639,19 +1637,108 @@ static bool omap2_nand_ecc_check(struct omap_nand_info *info,
 	return true;
 }
 
+static int omap_ooblayout_ecc(struct mtd_info *mtd, int section,
+			      struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	int off = chip->options & NAND_BUSWIDTH_16 ?
+		  BADBLOCK_MARKER_LENGTH : 1;
+
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = off;
+	oobregion->length = chip->ecc.total;
+
+	return 0;
+}
+
+static int omap_ooblayout_free(struct mtd_info *mtd, int section,
+			       struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	int off = chip->options & NAND_BUSWIDTH_16 ?
+		  BADBLOCK_MARKER_LENGTH : 1;
+
+	if (section)
+		return -ERANGE;
+
+	off += chip->ecc.total;
+	if (off >= mtd->oobsize)
+		return -ERANGE;
+
+	oobregion->offset = off;
+	oobregion->length = mtd->oobsize - off;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops omap_ooblayout_ops = {
+	.ecc = omap_ooblayout_ecc,
+	.free = omap_ooblayout_free,
+};
+
+static int omap_sw_ooblayout_ecc(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	int off = chip->options & NAND_BUSWIDTH_16 ?
+		  BADBLOCK_MARKER_LENGTH : 1;
+
+	if (section >= chip->ecc.steps)
+		return -ERANGE;
+
+	/*
+	 * When SW correction is employed, one OMAP specific marker byte is
+	 * reserved after each ECC step.
+	 */
+	oobregion->offset = off + (section * (chip->ecc.bytes + 1));
+	oobregion->length = chip->ecc.bytes;
+
+	return 0;
+}
+
+static int omap_sw_ooblayout_free(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	int off = chip->options & NAND_BUSWIDTH_16 ?
+		  BADBLOCK_MARKER_LENGTH : 1;
+
+	if (section)
+		return -ERANGE;
+
+	/*
+	 * When SW correction is employed, one OMAP specific marker byte is
+	 * reserved after each ECC step.
+	 */
+	off += ((chip->ecc.bytes + 1) * chip->ecc.steps);
+	if (off >= mtd->oobsize)
+		return -ERANGE;
+
+	oobregion->offset = off;
+	oobregion->length = mtd->oobsize - off;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops omap_sw_ooblayout_ops = {
+	.ecc = omap_sw_ooblayout_ecc,
+	.free = omap_sw_ooblayout_free,
+};
+
 static int omap_nand_probe(struct platform_device *pdev)
 {
 	struct omap_nand_info		*info;
 	struct omap_nand_platform_data	*pdata;
 	struct mtd_info			*mtd;
 	struct nand_chip		*nand_chip;
-	struct nand_ecclayout		*ecclayout;
 	int				err;
-	int				i;
 	dma_cap_mask_t			mask;
 	unsigned			sig;
-	unsigned			oob_index;
 	struct resource			*res;
+	int				min_oobbytes;
+	int				oobbytes_per_step;
 
 	pdata = dev_get_platdata(&pdev->dev);
 	if (pdata == NULL) {
@@ -1810,7 +1897,7 @@ static int omap_nand_probe(struct platform_device *pdev)
 
 	/*
 	 * Bail out earlier to let NAND_ECC_SOFT code create its own
-	 * ecclayout instead of using ours.
+	 * ooblayout instead of using ours.
 	 */
 	if (info->ecc_opt == OMAP_ECC_HAM1_CODE_SW) {
 		nand_chip->ecc.mode = NAND_ECC_SOFT;
@@ -1818,8 +1905,6 @@ static int omap_nand_probe(struct platform_device *pdev)
 	}
 
 	/* populate MTD interface based on ECC scheme */
-	ecclayout		= &info->oobinfo;
-	nand_chip->ecc.layout	= ecclayout;
 	switch (info->ecc_opt) {
 	case OMAP_ECC_HAM1_CODE_HW:
 		pr_info("nand: using OMAP_ECC_HAM1_CODE_HW\n");
@@ -1830,19 +1915,8 @@ static int omap_nand_probe(struct platform_device *pdev)
 		nand_chip->ecc.calculate        = omap_calculate_ecc;
 		nand_chip->ecc.hwctl            = omap_enable_hwecc;
 		nand_chip->ecc.correct          = omap_correct_data;
-		/* define ECC layout */
-		ecclayout->eccbytes		= nand_chip->ecc.bytes *
-							(mtd->writesize /
-							nand_chip->ecc.size);
-		if (nand_chip->options & NAND_BUSWIDTH_16)
-			oob_index		= BADBLOCK_MARKER_LENGTH;
-		else
-			oob_index		= 1;
-		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++)
-			ecclayout->eccpos[i]	= oob_index;
-		/* no reserved-marker in ecclayout for this ecc-scheme */
-		ecclayout->oobfree->offset	=
-				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
+		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
+		oobbytes_per_step		= nand_chip->ecc.bytes;
 		break;
 
 	case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
@@ -1854,19 +1928,9 @@ static int omap_nand_probe(struct platform_device *pdev)
 		nand_chip->ecc.hwctl		= omap_enable_hwecc_bch;
 		nand_chip->ecc.correct		= nand_bch_correct_data;
 		nand_chip->ecc.calculate	= omap_calculate_ecc_bch;
-		/* define ECC layout */
-		ecclayout->eccbytes		= nand_chip->ecc.bytes *
-							(mtd->writesize /
-							nand_chip->ecc.size);
-		oob_index			= BADBLOCK_MARKER_LENGTH;
-		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++) {
-			ecclayout->eccpos[i] = oob_index;
-			if (((i + 1) % nand_chip->ecc.bytes) == 0)
-				oob_index++;
-		}
-		/* include reserved-marker in ecclayout->oobfree calculation */
-		ecclayout->oobfree->offset	= 1 +
-				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
+		mtd_set_ooblayout(mtd, &omap_sw_ooblayout_ops);
+		/* Reserve one byte for the OMAP marker */
+		oobbytes_per_step		= nand_chip->ecc.bytes + 1;
 		/* software bch library is used for locating errors */
 		nand_chip->ecc.priv		= nand_bch_init(mtd);
 		if (!nand_chip->ecc.priv) {
@@ -1888,16 +1952,8 @@ static int omap_nand_probe(struct platform_device *pdev)
 		nand_chip->ecc.calculate	= omap_calculate_ecc_bch;
 		nand_chip->ecc.read_page	= omap_read_page_bch;
 		nand_chip->ecc.write_page	= omap_write_page_bch;
-		/* define ECC layout */
-		ecclayout->eccbytes		= nand_chip->ecc.bytes *
-							(mtd->writesize /
-							nand_chip->ecc.size);
-		oob_index			= BADBLOCK_MARKER_LENGTH;
-		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++)
-			ecclayout->eccpos[i]	= oob_index;
-		/* reserved marker already included in ecclayout->eccbytes */
-		ecclayout->oobfree->offset	=
-				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
+		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
+		oobbytes_per_step		= nand_chip->ecc.bytes;
 
 		err = elm_config(info->elm_dev, BCH4_ECC,
 				 mtd->writesize / nand_chip->ecc.size,
@@ -1915,19 +1971,9 @@ static int omap_nand_probe(struct platform_device *pdev)
 		nand_chip->ecc.hwctl		= omap_enable_hwecc_bch;
 		nand_chip->ecc.correct		= nand_bch_correct_data;
 		nand_chip->ecc.calculate	= omap_calculate_ecc_bch;
-		/* define ECC layout */
-		ecclayout->eccbytes		= nand_chip->ecc.bytes *
-							(mtd->writesize /
-							nand_chip->ecc.size);
-		oob_index			= BADBLOCK_MARKER_LENGTH;
-		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++) {
-			ecclayout->eccpos[i] = oob_index;
-			if (((i + 1) % nand_chip->ecc.bytes) == 0)
-				oob_index++;
-		}
-		/* include reserved-marker in ecclayout->oobfree calculation */
-		ecclayout->oobfree->offset	= 1 +
-				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
+		mtd_set_ooblayout(mtd, &omap_sw_ooblayout_ops);
+		/* Reserve one byte for the OMAP marker */
+		oobbytes_per_step		= nand_chip->ecc.bytes + 1;
 		/* software bch library is used for locating errors */
 		nand_chip->ecc.priv		= nand_bch_init(mtd);
 		if (!nand_chip->ecc.priv) {
@@ -1949,6 +1995,8 @@ static int omap_nand_probe(struct platform_device *pdev)
 		nand_chip->ecc.calculate	= omap_calculate_ecc_bch;
 		nand_chip->ecc.read_page	= omap_read_page_bch;
 		nand_chip->ecc.write_page	= omap_write_page_bch;
+		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
+		oobbytes_per_step		= nand_chip->ecc.bytes;
 
 		err = elm_config(info->elm_dev, BCH8_ECC,
 				 mtd->writesize / nand_chip->ecc.size,
@@ -1956,16 +2004,6 @@ static int omap_nand_probe(struct platform_device *pdev)
 		if (err < 0)
 			goto return_error;
 
-		/* define ECC layout */
-		ecclayout->eccbytes		= nand_chip->ecc.bytes *
-							(mtd->writesize /
-							nand_chip->ecc.size);
-		oob_index			= BADBLOCK_MARKER_LENGTH;
-		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++)
-			ecclayout->eccpos[i]	= oob_index;
-		/* reserved marker already included in ecclayout->eccbytes */
-		ecclayout->oobfree->offset	=
-				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
 		break;
 
 	case OMAP_ECC_BCH16_CODE_HW:
@@ -1979,6 +2017,8 @@ static int omap_nand_probe(struct platform_device *pdev)
 		nand_chip->ecc.calculate	= omap_calculate_ecc_bch;
 		nand_chip->ecc.read_page	= omap_read_page_bch;
 		nand_chip->ecc.write_page	= omap_write_page_bch;
+		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
+		oobbytes_per_step		= nand_chip->ecc.bytes;
 
 		err = elm_config(info->elm_dev, BCH16_ECC,
 				 mtd->writesize / nand_chip->ecc.size,
@@ -1986,16 +2026,6 @@ static int omap_nand_probe(struct platform_device *pdev)
 		if (err < 0)
 			goto return_error;
 
-		/* define ECC layout */
-		ecclayout->eccbytes		= nand_chip->ecc.bytes *
-							(mtd->writesize /
-							nand_chip->ecc.size);
-		oob_index			= BADBLOCK_MARKER_LENGTH;
-		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++)
-			ecclayout->eccpos[i]	= oob_index;
-		/* reserved marker already included in ecclayout->eccbytes */
-		ecclayout->oobfree->offset	=
-				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
 		break;
 	default:
 		dev_err(&info->pdev->dev, "invalid or unsupported ECC scheme\n");
@@ -2003,13 +2033,15 @@ static int omap_nand_probe(struct platform_device *pdev)
 		goto return_error;
 	}
 
-	/* all OOB bytes from oobfree->offset till end off OOB are free */
-	ecclayout->oobfree->length = mtd->oobsize - ecclayout->oobfree->offset;
 	/* check if NAND device's OOB is enough to store ECC signatures */
-	if (mtd->oobsize < (ecclayout->eccbytes + BADBLOCK_MARKER_LENGTH)) {
+	min_oobbytes = (oobbytes_per_step *
+			(mtd->writesize / nand_chip->ecc.size)) +
+		       (nand_chip->options & NAND_BUSWIDTH_16 ?
+			BADBLOCK_MARKER_LENGTH : 1);
+	if (mtd->oobsize < min_oobbytes) {
 		dev_err(&info->pdev->dev,
 			"not enough OOB bytes required = %d, available=%d\n",
-			ecclayout->eccbytes, mtd->oobsize);
+			min_oobbytes, mtd->oobsize);
 		err = -EINVAL;
 		goto return_error;
 	}
-- 
2.5.0

[PATCH v5 40/50] mtd: nand: pxa3xx: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/pxa3xx_nand.c | 104 +++++++++++++++++++++++++----------------
 1 file changed, 64 insertions(+), 40 deletions(-)

diff --git a/drivers/mtd/nand/pxa3xx_nand.c b/drivers/mtd/nand/pxa3xx_nand.c
index d650885..ce2e2d9 100644
--- a/drivers/mtd/nand/pxa3xx_nand.c
+++ b/drivers/mtd/nand/pxa3xx_nand.c
@@ -324,6 +324,62 @@ static struct pxa3xx_nand_flash builtin_flash_types[] = {
 	{ 0xba20, 16, 16, &timing[3] },
 };
 
+static int pxa3xx_ooblayout_ecc(struct mtd_info *mtd, int section,
+				struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct pxa3xx_nand_host *host = nand_get_controller_data(chip);
+	struct pxa3xx_nand_info *info = host->info_data;
+	int nchunks = mtd->writesize / info->chunk_size;
+
+	if (section >= nchunks)
+		return -ERANGE;
+
+	oobregion->offset = ((info->ecc_size + info->spare_size) * section) +
+			    info->spare_size;
+	oobregion->length = info->ecc_size;
+
+	return 0;
+}
+
+static int pxa3xx_ooblayout_free(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct pxa3xx_nand_host *host = nand_get_controller_data(chip);
+	struct pxa3xx_nand_info *info = host->info_data;
+	int nchunks = mtd->writesize / info->chunk_size;
+
+	if (section >= nchunks)
+		return -ERANGE;
+
+	if (!info->spare_size)
+		return 0;
+
+	oobregion->offset = section * (info->ecc_size + info->spare_size);
+	oobregion->length = info->spare_size;
+	if (!section) {
+		/*
+		 * Bootrom looks in bytes 0 & 5 for bad blocks for the
+		 * 4KB page / 4bit BCH combination.
+		 */
+		if (mtd->writesize == 4096 && info->chunk_size == 2048) {
+			oobregion->offset += 6;
+			oobregion->length -= 6;
+		} else {
+			oobregion->offset += 2;
+			oobregion->length -= 2;
+		}
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops pxa3xx_ooblayout_ops = {
+	.ecc = pxa3xx_ooblayout_ecc,
+	.free = pxa3xx_ooblayout_free,
+};
+
 static u8 bbt_pattern[] = {'M', 'V', 'B', 'b', 't', '0' };
 static u8 bbt_mirror_pattern[] = {'1', 't', 'b', 'B', 'V', 'M' };
 
@@ -347,41 +403,6 @@ static struct nand_bbt_descr bbt_mirror_descr = {
 	.pattern = bbt_mirror_pattern
 };
 
-static struct nand_ecclayout ecc_layout_2KB_bch4bit = {
-	.eccbytes = 32,
-	.eccpos = {
-		32, 33, 34, 35, 36, 37, 38, 39,
-		40, 41, 42, 43, 44, 45, 46, 47,
-		48, 49, 50, 51, 52, 53, 54, 55,
-		56, 57, 58, 59, 60, 61, 62, 63},
-	.oobfree = { {2, 30} }
-};
-
-static struct nand_ecclayout ecc_layout_4KB_bch4bit = {
-	.eccbytes = 64,
-	.eccpos = {
-		32,  33,  34,  35,  36,  37,  38,  39,
-		40,  41,  42,  43,  44,  45,  46,  47,
-		48,  49,  50,  51,  52,  53,  54,  55,
-		56,  57,  58,  59,  60,  61,  62,  63,
-		96,  97,  98,  99,  100, 101, 102, 103,
-		104, 105, 106, 107, 108, 109, 110, 111,
-		112, 113, 114, 115, 116, 117, 118, 119,
-		120, 121, 122, 123, 124, 125, 126, 127},
-	/* Bootrom looks in bytes 0 & 5 for bad blocks */
-	.oobfree = { {6, 26}, { 64, 32} }
-};
-
-static struct nand_ecclayout ecc_layout_4KB_bch8bit = {
-	.eccbytes = 128,
-	.eccpos = {
-		32,  33,  34,  35,  36,  37,  38,  39,
-		40,  41,  42,  43,  44,  45,  46,  47,
-		48,  49,  50,  51,  52,  53,  54,  55,
-		56,  57,  58,  59,  60,  61,  62,  63},
-	.oobfree = { }
-};
-
 #define NDTR0_tCH(c)	(min((c), 7) << 19)
 #define NDTR0_tCS(c)	(min((c), 7) << 16)
 #define NDTR0_tWH(c)	(min((c), 7) << 11)
@@ -1546,9 +1567,12 @@ static void pxa3xx_nand_free_buff(struct pxa3xx_nand_info *info)
 }
 
 static int pxa_ecc_init(struct pxa3xx_nand_info *info,
-			struct nand_ecc_ctrl *ecc,
+			struct mtd_info *mtd,
 			int strength, int ecc_stepsize, int page_size)
 {
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct nand_ecc_ctrl *ecc = &chip->ecc;
+
 	if (strength == 1 && ecc_stepsize == 512 && page_size == 2048) {
 		info->nfullchunks = 1;
 		info->ntotalchunks = 1;
@@ -1582,7 +1606,7 @@ static int pxa_ecc_init(struct pxa3xx_nand_info *info,
 		info->ecc_size = 32;
 		ecc->mode = NAND_ECC_HW;
 		ecc->size = info->chunk_size;
-		ecc->layout = &ecc_layout_2KB_bch4bit;
+		mtd_set_ooblayout(mtd, &pxa3xx_ooblayout_ops);
 		ecc->strength = 16;
 
 	} else if (strength == 4 && ecc_stepsize == 512 && page_size == 4096) {
@@ -1594,7 +1618,7 @@ static int pxa_ecc_init(struct pxa3xx_nand_info *info,
 		info->ecc_size = 32;
 		ecc->mode = NAND_ECC_HW;
 		ecc->size = info->chunk_size;
-		ecc->layout = &ecc_layout_4KB_bch4bit;
+		mtd_set_ooblayout(mtd, &pxa3xx_ooblayout_ops);
 		ecc->strength = 16;
 
 	/*
@@ -1612,7 +1636,7 @@ static int pxa_ecc_init(struct pxa3xx_nand_info *info,
 		info->ecc_size = 32;
 		ecc->mode = NAND_ECC_HW;
 		ecc->size = info->chunk_size;
-		ecc->layout = &ecc_layout_4KB_bch8bit;
+		mtd_set_ooblayout(mtd, &pxa3xx_ooblayout_ops);
 		ecc->strength = 16;
 	} else {
 		dev_err(&info->pdev->dev,
@@ -1703,7 +1727,7 @@ static int pxa3xx_nand_scan(struct mtd_info *mtd)
 		ecc_step = 512;
 	}
 
-	ret = pxa_ecc_init(info, &chip->ecc, ecc_strength,
+	ret = pxa_ecc_init(info, mtd, ecc_strength,
 			   ecc_step, mtd->writesize);
 	if (ret)
 		return ret;
-- 
2.5.0

[PATCH v5 40/50] mtd: nand: pxa3xx: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/mtd/nand/pxa3xx_nand.c | 104 +++++++++++++++++++++++++----------------
 1 file changed, 64 insertions(+), 40 deletions(-)

diff --git a/drivers/mtd/nand/pxa3xx_nand.c b/drivers/mtd/nand/pxa3xx_nand.c
index d650885..ce2e2d9 100644
--- a/drivers/mtd/nand/pxa3xx_nand.c
+++ b/drivers/mtd/nand/pxa3xx_nand.c
@@ -324,6 +324,62 @@ static struct pxa3xx_nand_flash builtin_flash_types[] = {
 	{ 0xba20, 16, 16, &timing[3] },
 };
 
+static int pxa3xx_ooblayout_ecc(struct mtd_info *mtd, int section,
+				struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct pxa3xx_nand_host *host = nand_get_controller_data(chip);
+	struct pxa3xx_nand_info *info = host->info_data;
+	int nchunks = mtd->writesize / info->chunk_size;
+
+	if (section >= nchunks)
+		return -ERANGE;
+
+	oobregion->offset = ((info->ecc_size + info->spare_size) * section) +
+			    info->spare_size;
+	oobregion->length = info->ecc_size;
+
+	return 0;
+}
+
+static int pxa3xx_ooblayout_free(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct pxa3xx_nand_host *host = nand_get_controller_data(chip);
+	struct pxa3xx_nand_info *info = host->info_data;
+	int nchunks = mtd->writesize / info->chunk_size;
+
+	if (section >= nchunks)
+		return -ERANGE;
+
+	if (!info->spare_size)
+		return 0;
+
+	oobregion->offset = section * (info->ecc_size + info->spare_size);
+	oobregion->length = info->spare_size;
+	if (!section) {
+		/*
+		 * Bootrom looks in bytes 0 & 5 for bad blocks for the
+		 * 4KB page / 4bit BCH combination.
+		 */
+		if (mtd->writesize == 4096 && info->chunk_size == 2048) {
+			oobregion->offset += 6;
+			oobregion->length -= 6;
+		} else {
+			oobregion->offset += 2;
+			oobregion->length -= 2;
+		}
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops pxa3xx_ooblayout_ops = {
+	.ecc = pxa3xx_ooblayout_ecc,
+	.free = pxa3xx_ooblayout_free,
+};
+
 static u8 bbt_pattern[] = {'M', 'V', 'B', 'b', 't', '0' };
 static u8 bbt_mirror_pattern[] = {'1', 't', 'b', 'B', 'V', 'M' };
 
@@ -347,41 +403,6 @@ static struct nand_bbt_descr bbt_mirror_descr = {
 	.pattern = bbt_mirror_pattern
 };
 
-static struct nand_ecclayout ecc_layout_2KB_bch4bit = {
-	.eccbytes = 32,
-	.eccpos = {
-		32, 33, 34, 35, 36, 37, 38, 39,
-		40, 41, 42, 43, 44, 45, 46, 47,
-		48, 49, 50, 51, 52, 53, 54, 55,
-		56, 57, 58, 59, 60, 61, 62, 63},
-	.oobfree = { {2, 30} }
-};
-
-static struct nand_ecclayout ecc_layout_4KB_bch4bit = {
-	.eccbytes = 64,
-	.eccpos = {
-		32,  33,  34,  35,  36,  37,  38,  39,
-		40,  41,  42,  43,  44,  45,  46,  47,
-		48,  49,  50,  51,  52,  53,  54,  55,
-		56,  57,  58,  59,  60,  61,  62,  63,
-		96,  97,  98,  99,  100, 101, 102, 103,
-		104, 105, 106, 107, 108, 109, 110, 111,
-		112, 113, 114, 115, 116, 117, 118, 119,
-		120, 121, 122, 123, 124, 125, 126, 127},
-	/* Bootrom looks in bytes 0 & 5 for bad blocks */
-	.oobfree = { {6, 26}, { 64, 32} }
-};
-
-static struct nand_ecclayout ecc_layout_4KB_bch8bit = {
-	.eccbytes = 128,
-	.eccpos = {
-		32,  33,  34,  35,  36,  37,  38,  39,
-		40,  41,  42,  43,  44,  45,  46,  47,
-		48,  49,  50,  51,  52,  53,  54,  55,
-		56,  57,  58,  59,  60,  61,  62,  63},
-	.oobfree = { }
-};
-
 #define NDTR0_tCH(c)	(min((c), 7) << 19)
 #define NDTR0_tCS(c)	(min((c), 7) << 16)
 #define NDTR0_tWH(c)	(min((c), 7) << 11)
@@ -1546,9 +1567,12 @@ static void pxa3xx_nand_free_buff(struct pxa3xx_nand_info *info)
 }
 
 static int pxa_ecc_init(struct pxa3xx_nand_info *info,
-			struct nand_ecc_ctrl *ecc,
+			struct mtd_info *mtd,
 			int strength, int ecc_stepsize, int page_size)
 {
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct nand_ecc_ctrl *ecc = &chip->ecc;
+
 	if (strength == 1 && ecc_stepsize == 512 && page_size == 2048) {
 		info->nfullchunks = 1;
 		info->ntotalchunks = 1;
@@ -1582,7 +1606,7 @@ static int pxa_ecc_init(struct pxa3xx_nand_info *info,
 		info->ecc_size = 32;
 		ecc->mode = NAND_ECC_HW;
 		ecc->size = info->chunk_size;
-		ecc->layout = &ecc_layout_2KB_bch4bit;
+		mtd_set_ooblayout(mtd, &pxa3xx_ooblayout_ops);
 		ecc->strength = 16;
 
 	} else if (strength == 4 && ecc_stepsize == 512 && page_size == 4096) {
@@ -1594,7 +1618,7 @@ static int pxa_ecc_init(struct pxa3xx_nand_info *info,
 		info->ecc_size = 32;
 		ecc->mode = NAND_ECC_HW;
 		ecc->size = info->chunk_size;
-		ecc->layout = &ecc_layout_4KB_bch4bit;
+		mtd_set_ooblayout(mtd, &pxa3xx_ooblayout_ops);
 		ecc->strength = 16;
 
 	/*
@@ -1612,7 +1636,7 @@ static int pxa_ecc_init(struct pxa3xx_nand_info *info,
 		info->ecc_size = 32;
 		ecc->mode = NAND_ECC_HW;
 		ecc->size = info->chunk_size;
-		ecc->layout = &ecc_layout_4KB_bch8bit;
+		mtd_set_ooblayout(mtd, &pxa3xx_ooblayout_ops);
 		ecc->strength = 16;
 	} else {
 		dev_err(&info->pdev->dev,
@@ -1703,7 +1727,7 @@ static int pxa3xx_nand_scan(struct mtd_info *mtd)
 		ecc_step = 512;
 	}
 
-	ret = pxa_ecc_init(info, &chip->ecc, ecc_strength,
+	ret = pxa_ecc_init(info, mtd, ecc_strength,
 			   ecc_step, mtd->writesize);
 	if (ret)
 		return ret;
-- 
2.5.0

[PATCH v5 40/50] mtd: nand: pxa3xx: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/pxa3xx_nand.c | 104 +++++++++++++++++++++++++----------------
 1 file changed, 64 insertions(+), 40 deletions(-)

diff --git a/drivers/mtd/nand/pxa3xx_nand.c b/drivers/mtd/nand/pxa3xx_nand.c
index d650885..ce2e2d9 100644
--- a/drivers/mtd/nand/pxa3xx_nand.c
+++ b/drivers/mtd/nand/pxa3xx_nand.c
@@ -324,6 +324,62 @@ static struct pxa3xx_nand_flash builtin_flash_types[] = {
 	{ 0xba20, 16, 16, &timing[3] },
 };
 
+static int pxa3xx_ooblayout_ecc(struct mtd_info *mtd, int section,
+				struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct pxa3xx_nand_host *host = nand_get_controller_data(chip);
+	struct pxa3xx_nand_info *info = host->info_data;
+	int nchunks = mtd->writesize / info->chunk_size;
+
+	if (section >= nchunks)
+		return -ERANGE;
+
+	oobregion->offset = ((info->ecc_size + info->spare_size) * section) +
+			    info->spare_size;
+	oobregion->length = info->ecc_size;
+
+	return 0;
+}
+
+static int pxa3xx_ooblayout_free(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct pxa3xx_nand_host *host = nand_get_controller_data(chip);
+	struct pxa3xx_nand_info *info = host->info_data;
+	int nchunks = mtd->writesize / info->chunk_size;
+
+	if (section >= nchunks)
+		return -ERANGE;
+
+	if (!info->spare_size)
+		return 0;
+
+	oobregion->offset = section * (info->ecc_size + info->spare_size);
+	oobregion->length = info->spare_size;
+	if (!section) {
+		/*
+		 * Bootrom looks in bytes 0 & 5 for bad blocks for the
+		 * 4KB page / 4bit BCH combination.
+		 */
+		if (mtd->writesize == 4096 && info->chunk_size == 2048) {
+			oobregion->offset += 6;
+			oobregion->length -= 6;
+		} else {
+			oobregion->offset += 2;
+			oobregion->length -= 2;
+		}
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops pxa3xx_ooblayout_ops = {
+	.ecc = pxa3xx_ooblayout_ecc,
+	.free = pxa3xx_ooblayout_free,
+};
+
 static u8 bbt_pattern[] = {'M', 'V', 'B', 'b', 't', '0' };
 static u8 bbt_mirror_pattern[] = {'1', 't', 'b', 'B', 'V', 'M' };
 
@@ -347,41 +403,6 @@ static struct nand_bbt_descr bbt_mirror_descr = {
 	.pattern = bbt_mirror_pattern
 };
 
-static struct nand_ecclayout ecc_layout_2KB_bch4bit = {
-	.eccbytes = 32,
-	.eccpos = {
-		32, 33, 34, 35, 36, 37, 38, 39,
-		40, 41, 42, 43, 44, 45, 46, 47,
-		48, 49, 50, 51, 52, 53, 54, 55,
-		56, 57, 58, 59, 60, 61, 62, 63},
-	.oobfree = { {2, 30} }
-};
-
-static struct nand_ecclayout ecc_layout_4KB_bch4bit = {
-	.eccbytes = 64,
-	.eccpos = {
-		32,  33,  34,  35,  36,  37,  38,  39,
-		40,  41,  42,  43,  44,  45,  46,  47,
-		48,  49,  50,  51,  52,  53,  54,  55,
-		56,  57,  58,  59,  60,  61,  62,  63,
-		96,  97,  98,  99,  100, 101, 102, 103,
-		104, 105, 106, 107, 108, 109, 110, 111,
-		112, 113, 114, 115, 116, 117, 118, 119,
-		120, 121, 122, 123, 124, 125, 126, 127},
-	/* Bootrom looks in bytes 0 & 5 for bad blocks */
-	.oobfree = { {6, 26}, { 64, 32} }
-};
-
-static struct nand_ecclayout ecc_layout_4KB_bch8bit = {
-	.eccbytes = 128,
-	.eccpos = {
-		32,  33,  34,  35,  36,  37,  38,  39,
-		40,  41,  42,  43,  44,  45,  46,  47,
-		48,  49,  50,  51,  52,  53,  54,  55,
-		56,  57,  58,  59,  60,  61,  62,  63},
-	.oobfree = { }
-};
-
 #define NDTR0_tCH(c)	(min((c), 7) << 19)
 #define NDTR0_tCS(c)	(min((c), 7) << 16)
 #define NDTR0_tWH(c)	(min((c), 7) << 11)
@@ -1546,9 +1567,12 @@ static void pxa3xx_nand_free_buff(struct pxa3xx_nand_info *info)
 }
 
 static int pxa_ecc_init(struct pxa3xx_nand_info *info,
-			struct nand_ecc_ctrl *ecc,
+			struct mtd_info *mtd,
 			int strength, int ecc_stepsize, int page_size)
 {
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct nand_ecc_ctrl *ecc = &chip->ecc;
+
 	if (strength == 1 && ecc_stepsize == 512 && page_size == 2048) {
 		info->nfullchunks = 1;
 		info->ntotalchunks = 1;
@@ -1582,7 +1606,7 @@ static int pxa_ecc_init(struct pxa3xx_nand_info *info,
 		info->ecc_size = 32;
 		ecc->mode = NAND_ECC_HW;
 		ecc->size = info->chunk_size;
-		ecc->layout = &ecc_layout_2KB_bch4bit;
+		mtd_set_ooblayout(mtd, &pxa3xx_ooblayout_ops);
 		ecc->strength = 16;
 
 	} else if (strength == 4 && ecc_stepsize == 512 && page_size == 4096) {
@@ -1594,7 +1618,7 @@ static int pxa_ecc_init(struct pxa3xx_nand_info *info,
 		info->ecc_size = 32;
 		ecc->mode = NAND_ECC_HW;
 		ecc->size = info->chunk_size;
-		ecc->layout = &ecc_layout_4KB_bch4bit;
+		mtd_set_ooblayout(mtd, &pxa3xx_ooblayout_ops);
 		ecc->strength = 16;
 
 	/*
@@ -1612,7 +1636,7 @@ static int pxa_ecc_init(struct pxa3xx_nand_info *info,
 		info->ecc_size = 32;
 		ecc->mode = NAND_ECC_HW;
 		ecc->size = info->chunk_size;
-		ecc->layout = &ecc_layout_4KB_bch8bit;
+		mtd_set_ooblayout(mtd, &pxa3xx_ooblayout_ops);
 		ecc->strength = 16;
 	} else {
 		dev_err(&info->pdev->dev,
@@ -1703,7 +1727,7 @@ static int pxa3xx_nand_scan(struct mtd_info *mtd)
 		ecc_step = 512;
 	}
 
-	ret = pxa_ecc_init(info, &chip->ecc, ecc_strength,
+	ret = pxa_ecc_init(info, mtd, ecc_strength,
 			   ecc_step, mtd->writesize);
 	if (ret)
 		return ret;
-- 
2.5.0

[PATCH v5 41/50] mtd: nand: s3c2410: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/s3c2410.c | 32 +++++++++++++++++++++++++++-----
 1 file changed, 27 insertions(+), 5 deletions(-)

diff --git a/drivers/mtd/nand/s3c2410.c b/drivers/mtd/nand/s3c2410.c
index 9c9397b..700c097 100644
--- a/drivers/mtd/nand/s3c2410.c
+++ b/drivers/mtd/nand/s3c2410.c
@@ -84,11 +84,33 @@
 
 /* new oob placement block for use with hardware ecc generation
  */
+static int s3c2410_ooblayout_ecc(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 0;
+	oobregion->length = 3;
+
+	return 0;
+}
+
+static int s3c2410_ooblayout_free(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 8;
+	oobregion->length = 8;
+
+	return 0;
+}
 
-static struct nand_ecclayout nand_hw_eccoob = {
-	.eccbytes = 3,
-	.eccpos = {0, 1, 2},
-	.oobfree = {{8, 8}}
+static const struct mtd_ooblayout_ops s3c2410_ooblayout_ops = {
+	.ecc = s3c2410_ooblayout_ecc,
+	.free = s3c2410_ooblayout_free,
 };
 
 /* controller and mtd information */
@@ -919,7 +941,7 @@ static void s3c2410_nand_update_chip(struct s3c2410_nand_info *info,
 	} else {
 		chip->ecc.size	    = 512;
 		chip->ecc.bytes	    = 3;
-		chip->ecc.layout    = &nand_hw_eccoob;
+		mtd_set_ooblayout(nand_to_mtd(chip), &s3c2410_ooblayout_ops);
 	}
 }
 
-- 
2.5.0

[PATCH v5 41/50] mtd: nand: s3c2410: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/mtd/nand/s3c2410.c | 32 +++++++++++++++++++++++++++-----
 1 file changed, 27 insertions(+), 5 deletions(-)

diff --git a/drivers/mtd/nand/s3c2410.c b/drivers/mtd/nand/s3c2410.c
index 9c9397b..700c097 100644
--- a/drivers/mtd/nand/s3c2410.c
+++ b/drivers/mtd/nand/s3c2410.c
@@ -84,11 +84,33 @@
 
 /* new oob placement block for use with hardware ecc generation
  */
+static int s3c2410_ooblayout_ecc(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 0;
+	oobregion->length = 3;
+
+	return 0;
+}
+
+static int s3c2410_ooblayout_free(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 8;
+	oobregion->length = 8;
+
+	return 0;
+}
 
-static struct nand_ecclayout nand_hw_eccoob = {
-	.eccbytes = 3,
-	.eccpos = {0, 1, 2},
-	.oobfree = {{8, 8}}
+static const struct mtd_ooblayout_ops s3c2410_ooblayout_ops = {
+	.ecc = s3c2410_ooblayout_ecc,
+	.free = s3c2410_ooblayout_free,
 };
 
 /* controller and mtd information */
@@ -919,7 +941,7 @@ static void s3c2410_nand_update_chip(struct s3c2410_nand_info *info,
 	} else {
 		chip->ecc.size	    = 512;
 		chip->ecc.bytes	    = 3;
-		chip->ecc.layout    = &nand_hw_eccoob;
+		mtd_set_ooblayout(nand_to_mtd(chip), &s3c2410_ooblayout_ops);
 	}
 }
 
-- 
2.5.0

[PATCH v5 41/50] mtd: nand: s3c2410: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/s3c2410.c | 32 +++++++++++++++++++++++++++-----
 1 file changed, 27 insertions(+), 5 deletions(-)

diff --git a/drivers/mtd/nand/s3c2410.c b/drivers/mtd/nand/s3c2410.c
index 9c9397b..700c097 100644
--- a/drivers/mtd/nand/s3c2410.c
+++ b/drivers/mtd/nand/s3c2410.c
@@ -84,11 +84,33 @@
 
 /* new oob placement block for use with hardware ecc generation
  */
+static int s3c2410_ooblayout_ecc(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 0;
+	oobregion->length = 3;
+
+	return 0;
+}
+
+static int s3c2410_ooblayout_free(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 8;
+	oobregion->length = 8;
+
+	return 0;
+}
 
-static struct nand_ecclayout nand_hw_eccoob = {
-	.eccbytes = 3,
-	.eccpos = {0, 1, 2},
-	.oobfree = {{8, 8}}
+static const struct mtd_ooblayout_ops s3c2410_ooblayout_ops = {
+	.ecc = s3c2410_ooblayout_ecc,
+	.free = s3c2410_ooblayout_free,
 };
 
 /* controller and mtd information */
@@ -919,7 +941,7 @@ static void s3c2410_nand_update_chip(struct s3c2410_nand_info *info,
 	} else {
 		chip->ecc.size	    = 512;
 		chip->ecc.bytes	    = 3;
-		chip->ecc.layout    = &nand_hw_eccoob;
+		mtd_set_ooblayout(nand_to_mtd(chip), &s3c2410_ooblayout_ops);
 	}
 }
 
-- 
2.5.0

[PATCH v5 42/50] mtd: nand: sh_flctl: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/sh_flctl.c | 87 ++++++++++++++++++++++++++++++++++-----------
 1 file changed, 67 insertions(+), 20 deletions(-)

diff --git a/drivers/mtd/nand/sh_flctl.c b/drivers/mtd/nand/sh_flctl.c
index 4814402..fa46610 100644
--- a/drivers/mtd/nand/sh_flctl.c
+++ b/drivers/mtd/nand/sh_flctl.c
@@ -43,26 +43,73 @@
 #include <linux/mtd/partitions.h>
 #include <linux/mtd/sh_flctl.h>
 
-static struct nand_ecclayout flctl_4secc_oob_16 = {
-	.eccbytes = 10,
-	.eccpos = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9},
-	.oobfree = {
-		{.offset = 12,
-		. length = 4} },
+static int flctl_4secc_ooblayout_sp_ecc(struct mtd_info *mtd, int section,
+					struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 0;
+	oobregion->length = chip->ecc.bytes;
+
+	return 0;
+}
+
+static int flctl_4secc_ooblayout_sp_free(struct mtd_info *mtd, int section,
+					 struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 12;
+	oobregion->length = 4;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops flctl_4secc_oob_smallpage_ops = {
+	.ecc = flctl_4secc_ooblayout_sp_ecc,
+	.free = flctl_4secc_ooblayout_sp_free,
 };
 
-static struct nand_ecclayout flctl_4secc_oob_64 = {
-	.eccbytes = 4 * 10,
-	.eccpos = {
-		 6,  7,  8,  9, 10, 11, 12, 13, 14, 15,
-		22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
-		38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
-		54, 55, 56, 57, 58, 59, 60, 61, 62, 63 },
-	.oobfree = {
-		{.offset =  2, .length = 4},
-		{.offset = 16, .length = 6},
-		{.offset = 32, .length = 6},
-		{.offset = 48, .length = 6} },
+static int flctl_4secc_ooblayout_lp_ecc(struct mtd_info *mtd, int section,
+					struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section >= chip->ecc.steps)
+		return -ERANGE;
+
+	oobregion->offset = (section * 16) + 6;
+	oobregion->length = chip->ecc.bytes;
+
+	return 0;
+}
+
+static int flctl_4secc_ooblayout_lp_free(struct mtd_info *mtd, int section,
+					 struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section >= chip->ecc.steps)
+		return -ERANGE;
+
+	oobregion->offset = section * 16;
+	oobregion->length = 6;
+
+	if (!section) {
+		oobregion->offset += 2;
+		oobregion->length -= 2;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops flctl_4secc_oob_largepage_ops = {
+	.ecc = flctl_4secc_ooblayout_lp_ecc,
+	.free = flctl_4secc_ooblayout_lp_free,
 };
 
 static uint8_t scan_ff_pattern[] = { 0xff, 0xff };
@@ -987,10 +1034,10 @@ static int flctl_chip_init_tail(struct mtd_info *mtd)
 
 	if (flctl->hwecc) {
 		if (mtd->writesize == 512) {
-			chip->ecc.layout = &flctl_4secc_oob_16;
+			mtd_set_ooblayout(mtd, &flctl_4secc_oob_smallpage_ops);
 			chip->badblock_pattern = &flctl_4secc_smallpage;
 		} else {
-			chip->ecc.layout = &flctl_4secc_oob_64;
+			mtd_set_ooblayout(mtd, &flctl_4secc_oob_largepage_ops);
 			chip->badblock_pattern = &flctl_4secc_largepage;
 		}
 
-- 
2.5.0

[PATCH v5 42/50] mtd: nand: sh_flctl: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/mtd/nand/sh_flctl.c | 87 ++++++++++++++++++++++++++++++++++-----------
 1 file changed, 67 insertions(+), 20 deletions(-)

diff --git a/drivers/mtd/nand/sh_flctl.c b/drivers/mtd/nand/sh_flctl.c
index 4814402..fa46610 100644
--- a/drivers/mtd/nand/sh_flctl.c
+++ b/drivers/mtd/nand/sh_flctl.c
@@ -43,26 +43,73 @@
 #include <linux/mtd/partitions.h>
 #include <linux/mtd/sh_flctl.h>
 
-static struct nand_ecclayout flctl_4secc_oob_16 = {
-	.eccbytes = 10,
-	.eccpos = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9},
-	.oobfree = {
-		{.offset = 12,
-		. length = 4} },
+static int flctl_4secc_ooblayout_sp_ecc(struct mtd_info *mtd, int section,
+					struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 0;
+	oobregion->length = chip->ecc.bytes;
+
+	return 0;
+}
+
+static int flctl_4secc_ooblayout_sp_free(struct mtd_info *mtd, int section,
+					 struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 12;
+	oobregion->length = 4;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops flctl_4secc_oob_smallpage_ops = {
+	.ecc = flctl_4secc_ooblayout_sp_ecc,
+	.free = flctl_4secc_ooblayout_sp_free,
 };
 
-static struct nand_ecclayout flctl_4secc_oob_64 = {
-	.eccbytes = 4 * 10,
-	.eccpos = {
-		 6,  7,  8,  9, 10, 11, 12, 13, 14, 15,
-		22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
-		38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
-		54, 55, 56, 57, 58, 59, 60, 61, 62, 63 },
-	.oobfree = {
-		{.offset =  2, .length = 4},
-		{.offset = 16, .length = 6},
-		{.offset = 32, .length = 6},
-		{.offset = 48, .length = 6} },
+static int flctl_4secc_ooblayout_lp_ecc(struct mtd_info *mtd, int section,
+					struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section >= chip->ecc.steps)
+		return -ERANGE;
+
+	oobregion->offset = (section * 16) + 6;
+	oobregion->length = chip->ecc.bytes;
+
+	return 0;
+}
+
+static int flctl_4secc_ooblayout_lp_free(struct mtd_info *mtd, int section,
+					 struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section >= chip->ecc.steps)
+		return -ERANGE;
+
+	oobregion->offset = section * 16;
+	oobregion->length = 6;
+
+	if (!section) {
+		oobregion->offset += 2;
+		oobregion->length -= 2;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops flctl_4secc_oob_largepage_ops = {
+	.ecc = flctl_4secc_ooblayout_lp_ecc,
+	.free = flctl_4secc_ooblayout_lp_free,
 };
 
 static uint8_t scan_ff_pattern[] = { 0xff, 0xff };
@@ -987,10 +1034,10 @@ static int flctl_chip_init_tail(struct mtd_info *mtd)
 
 	if (flctl->hwecc) {
 		if (mtd->writesize == 512) {
-			chip->ecc.layout = &flctl_4secc_oob_16;
+			mtd_set_ooblayout(mtd, &flctl_4secc_oob_smallpage_ops);
 			chip->badblock_pattern = &flctl_4secc_smallpage;
 		} else {
-			chip->ecc.layout = &flctl_4secc_oob_64;
+			mtd_set_ooblayout(mtd, &flctl_4secc_oob_largepage_ops);
 			chip->badblock_pattern = &flctl_4secc_largepage;
 		}
 
-- 
2.5.0

[PATCH v5 42/50] mtd: nand: sh_flctl: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/sh_flctl.c | 87 ++++++++++++++++++++++++++++++++++-----------
 1 file changed, 67 insertions(+), 20 deletions(-)

diff --git a/drivers/mtd/nand/sh_flctl.c b/drivers/mtd/nand/sh_flctl.c
index 4814402..fa46610 100644
--- a/drivers/mtd/nand/sh_flctl.c
+++ b/drivers/mtd/nand/sh_flctl.c
@@ -43,26 +43,73 @@
 #include <linux/mtd/partitions.h>
 #include <linux/mtd/sh_flctl.h>
 
-static struct nand_ecclayout flctl_4secc_oob_16 = {
-	.eccbytes = 10,
-	.eccpos = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9},
-	.oobfree = {
-		{.offset = 12,
-		. length = 4} },
+static int flctl_4secc_ooblayout_sp_ecc(struct mtd_info *mtd, int section,
+					struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 0;
+	oobregion->length = chip->ecc.bytes;
+
+	return 0;
+}
+
+static int flctl_4secc_ooblayout_sp_free(struct mtd_info *mtd, int section,
+					 struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 12;
+	oobregion->length = 4;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops flctl_4secc_oob_smallpage_ops = {
+	.ecc = flctl_4secc_ooblayout_sp_ecc,
+	.free = flctl_4secc_ooblayout_sp_free,
 };
 
-static struct nand_ecclayout flctl_4secc_oob_64 = {
-	.eccbytes = 4 * 10,
-	.eccpos = {
-		 6,  7,  8,  9, 10, 11, 12, 13, 14, 15,
-		22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
-		38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
-		54, 55, 56, 57, 58, 59, 60, 61, 62, 63 },
-	.oobfree = {
-		{.offset =  2, .length = 4},
-		{.offset = 16, .length = 6},
-		{.offset = 32, .length = 6},
-		{.offset = 48, .length = 6} },
+static int flctl_4secc_ooblayout_lp_ecc(struct mtd_info *mtd, int section,
+					struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section >= chip->ecc.steps)
+		return -ERANGE;
+
+	oobregion->offset = (section * 16) + 6;
+	oobregion->length = chip->ecc.bytes;
+
+	return 0;
+}
+
+static int flctl_4secc_ooblayout_lp_free(struct mtd_info *mtd, int section,
+					 struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section >= chip->ecc.steps)
+		return -ERANGE;
+
+	oobregion->offset = section * 16;
+	oobregion->length = 6;
+
+	if (!section) {
+		oobregion->offset += 2;
+		oobregion->length -= 2;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops flctl_4secc_oob_largepage_ops = {
+	.ecc = flctl_4secc_ooblayout_lp_ecc,
+	.free = flctl_4secc_ooblayout_lp_free,
 };
 
 static uint8_t scan_ff_pattern[] = { 0xff, 0xff };
@@ -987,10 +1034,10 @@ static int flctl_chip_init_tail(struct mtd_info *mtd)
 
 	if (flctl->hwecc) {
 		if (mtd->writesize == 512) {
-			chip->ecc.layout = &flctl_4secc_oob_16;
+			mtd_set_ooblayout(mtd, &flctl_4secc_oob_smallpage_ops);
 			chip->badblock_pattern = &flctl_4secc_smallpage;
 		} else {
-			chip->ecc.layout = &flctl_4secc_oob_64;
+			mtd_set_ooblayout(mtd, &flctl_4secc_oob_largepage_ops);
 			chip->badblock_pattern = &flctl_4secc_largepage;
 		}
 
-- 
2.5.0

[PATCH v5 43/50] mtd: nand: sm_common: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/sm_common.c | 93 ++++++++++++++++++++++++++++++++++++--------
 1 file changed, 77 insertions(+), 16 deletions(-)

diff --git a/drivers/mtd/nand/sm_common.c b/drivers/mtd/nand/sm_common.c
index c514740..5939dff 100644
--- a/drivers/mtd/nand/sm_common.c
+++ b/drivers/mtd/nand/sm_common.c
@@ -12,14 +12,47 @@
 #include <linux/sizes.h>
 #include "sm_common.h"
 
-static struct nand_ecclayout nand_oob_sm = {
-	.eccbytes = 6,
-	.eccpos = {8, 9, 10, 13, 14, 15},
-	.oobfree = {
-		{.offset = 0 , .length = 4}, /* reserved */
-		{.offset = 6 , .length = 2}, /* LBA1 */
-		{.offset = 11, .length = 2}  /* LBA2 */
+static int oob_sm_ooblayout_ecc(struct mtd_info *mtd, int section,
+				struct mtd_oob_region *oobregion)
+{
+	if (section > 1)
+		return -ERANGE;
+
+	oobregion->length = 3;
+	oobregion->offset = ((section + 1) * 8) - 3;
+
+	return 0;
+}
+
+static int oob_sm_ooblayout_free(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	switch (section) {
+	case 0:
+		/* reserved */
+		oobregion->offset = 0;
+		oobregion->length = 4;
+		break;
+	case 1:
+		/* LBA1 */
+		oobregion->offset = 6;
+		oobregion->length = 2;
+		break;
+	case 2:
+		/* LBA2 */
+		oobregion->offset = 11;
+		oobregion->length = 2;
+		break;
+	default:
+		return -ERANGE;
 	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops oob_sm_ops = {
+	.ecc = oob_sm_ooblayout_ecc,
+	.free = oob_sm_ooblayout_free,
 };
 
 /* NOTE: This layout is is not compatabable with SmartMedia, */
@@ -28,15 +61,43 @@ static struct nand_ecclayout nand_oob_sm = {
 /* If you use smftl, it will bypass this and work correctly */
 /* If you not, then you break SmartMedia compliance anyway */
 
-static struct nand_ecclayout nand_oob_sm_small = {
-	.eccbytes = 3,
-	.eccpos = {0, 1, 2},
-	.oobfree = {
-		{.offset = 3 , .length = 2}, /* reserved */
-		{.offset = 6 , .length = 2}, /* LBA1 */
+static int oob_sm_small_ooblayout_ecc(struct mtd_info *mtd, int section,
+				      struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->length = 3;
+	oobregion->offset = 0;
+
+	return 0;
+}
+
+static int oob_sm_small_ooblayout_free(struct mtd_info *mtd, int section,
+				       struct mtd_oob_region *oobregion)
+{
+	switch (section) {
+	case 0:
+		/* reserved */
+		oobregion->offset = 3;
+		oobregion->length = 2;
+		break;
+	case 1:
+		/* LBA1 */
+		oobregion->offset = 6;
+		oobregion->length = 2;
+		break;
+	default:
+		return -ERANGE;
 	}
-};
 
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops oob_sm_small_ops = {
+	.ecc = oob_sm_small_ooblayout_ecc,
+	.free = oob_sm_small_ooblayout_free,
+};
 
 static int sm_block_markbad(struct mtd_info *mtd, loff_t ofs)
 {
@@ -121,9 +182,9 @@ int sm_register_device(struct mtd_info *mtd, int smartmedia)
 
 	/* ECC layout */
 	if (mtd->writesize == SM_SECTOR_SIZE)
-		chip->ecc.layout = &nand_oob_sm;
+		mtd_set_ooblayout(mtd, &oob_sm_ops);
 	else if (mtd->writesize == SM_SMALL_PAGE)
-		chip->ecc.layout = &nand_oob_sm_small;
+		mtd_set_ooblayout(mtd, &oob_sm_small_ops);
 	else
 		return -ENODEV;
 
-- 
2.5.0

[PATCH v5 43/50] mtd: nand: sm_common: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/mtd/nand/sm_common.c | 93 ++++++++++++++++++++++++++++++++++++--------
 1 file changed, 77 insertions(+), 16 deletions(-)

diff --git a/drivers/mtd/nand/sm_common.c b/drivers/mtd/nand/sm_common.c
index c514740..5939dff 100644
--- a/drivers/mtd/nand/sm_common.c
+++ b/drivers/mtd/nand/sm_common.c
@@ -12,14 +12,47 @@
 #include <linux/sizes.h>
 #include "sm_common.h"
 
-static struct nand_ecclayout nand_oob_sm = {
-	.eccbytes = 6,
-	.eccpos = {8, 9, 10, 13, 14, 15},
-	.oobfree = {
-		{.offset = 0 , .length = 4}, /* reserved */
-		{.offset = 6 , .length = 2}, /* LBA1 */
-		{.offset = 11, .length = 2}  /* LBA2 */
+static int oob_sm_ooblayout_ecc(struct mtd_info *mtd, int section,
+				struct mtd_oob_region *oobregion)
+{
+	if (section > 1)
+		return -ERANGE;
+
+	oobregion->length = 3;
+	oobregion->offset = ((section + 1) * 8) - 3;
+
+	return 0;
+}
+
+static int oob_sm_ooblayout_free(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	switch (section) {
+	case 0:
+		/* reserved */
+		oobregion->offset = 0;
+		oobregion->length = 4;
+		break;
+	case 1:
+		/* LBA1 */
+		oobregion->offset = 6;
+		oobregion->length = 2;
+		break;
+	case 2:
+		/* LBA2 */
+		oobregion->offset = 11;
+		oobregion->length = 2;
+		break;
+	default:
+		return -ERANGE;
 	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops oob_sm_ops = {
+	.ecc = oob_sm_ooblayout_ecc,
+	.free = oob_sm_ooblayout_free,
 };
 
 /* NOTE: This layout is is not compatabable with SmartMedia, */
@@ -28,15 +61,43 @@ static struct nand_ecclayout nand_oob_sm = {
 /* If you use smftl, it will bypass this and work correctly */
 /* If you not, then you break SmartMedia compliance anyway */
 
-static struct nand_ecclayout nand_oob_sm_small = {
-	.eccbytes = 3,
-	.eccpos = {0, 1, 2},
-	.oobfree = {
-		{.offset = 3 , .length = 2}, /* reserved */
-		{.offset = 6 , .length = 2}, /* LBA1 */
+static int oob_sm_small_ooblayout_ecc(struct mtd_info *mtd, int section,
+				      struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->length = 3;
+	oobregion->offset = 0;
+
+	return 0;
+}
+
+static int oob_sm_small_ooblayout_free(struct mtd_info *mtd, int section,
+				       struct mtd_oob_region *oobregion)
+{
+	switch (section) {
+	case 0:
+		/* reserved */
+		oobregion->offset = 3;
+		oobregion->length = 2;
+		break;
+	case 1:
+		/* LBA1 */
+		oobregion->offset = 6;
+		oobregion->length = 2;
+		break;
+	default:
+		return -ERANGE;
 	}
-};
 
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops oob_sm_small_ops = {
+	.ecc = oob_sm_small_ooblayout_ecc,
+	.free = oob_sm_small_ooblayout_free,
+};
 
 static int sm_block_markbad(struct mtd_info *mtd, loff_t ofs)
 {
@@ -121,9 +182,9 @@ int sm_register_device(struct mtd_info *mtd, int smartmedia)
 
 	/* ECC layout */
 	if (mtd->writesize == SM_SECTOR_SIZE)
-		chip->ecc.layout = &nand_oob_sm;
+		mtd_set_ooblayout(mtd, &oob_sm_ops);
 	else if (mtd->writesize == SM_SMALL_PAGE)
-		chip->ecc.layout = &nand_oob_sm_small;
+		mtd_set_ooblayout(mtd, &oob_sm_small_ops);
 	else
 		return -ENODEV;
 
-- 
2.5.0

[PATCH v5 43/50] mtd: nand: sm_common: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/sm_common.c | 93 ++++++++++++++++++++++++++++++++++++--------
 1 file changed, 77 insertions(+), 16 deletions(-)

diff --git a/drivers/mtd/nand/sm_common.c b/drivers/mtd/nand/sm_common.c
index c514740..5939dff 100644
--- a/drivers/mtd/nand/sm_common.c
+++ b/drivers/mtd/nand/sm_common.c
@@ -12,14 +12,47 @@
 #include <linux/sizes.h>
 #include "sm_common.h"
 
-static struct nand_ecclayout nand_oob_sm = {
-	.eccbytes = 6,
-	.eccpos = {8, 9, 10, 13, 14, 15},
-	.oobfree = {
-		{.offset = 0 , .length = 4}, /* reserved */
-		{.offset = 6 , .length = 2}, /* LBA1 */
-		{.offset = 11, .length = 2}  /* LBA2 */
+static int oob_sm_ooblayout_ecc(struct mtd_info *mtd, int section,
+				struct mtd_oob_region *oobregion)
+{
+	if (section > 1)
+		return -ERANGE;
+
+	oobregion->length = 3;
+	oobregion->offset = ((section + 1) * 8) - 3;
+
+	return 0;
+}
+
+static int oob_sm_ooblayout_free(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	switch (section) {
+	case 0:
+		/* reserved */
+		oobregion->offset = 0;
+		oobregion->length = 4;
+		break;
+	case 1:
+		/* LBA1 */
+		oobregion->offset = 6;
+		oobregion->length = 2;
+		break;
+	case 2:
+		/* LBA2 */
+		oobregion->offset = 11;
+		oobregion->length = 2;
+		break;
+	default:
+		return -ERANGE;
 	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops oob_sm_ops = {
+	.ecc = oob_sm_ooblayout_ecc,
+	.free = oob_sm_ooblayout_free,
 };
 
 /* NOTE: This layout is is not compatabable with SmartMedia, */
@@ -28,15 +61,43 @@ static struct nand_ecclayout nand_oob_sm = {
 /* If you use smftl, it will bypass this and work correctly */
 /* If you not, then you break SmartMedia compliance anyway */
 
-static struct nand_ecclayout nand_oob_sm_small = {
-	.eccbytes = 3,
-	.eccpos = {0, 1, 2},
-	.oobfree = {
-		{.offset = 3 , .length = 2}, /* reserved */
-		{.offset = 6 , .length = 2}, /* LBA1 */
+static int oob_sm_small_ooblayout_ecc(struct mtd_info *mtd, int section,
+				      struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->length = 3;
+	oobregion->offset = 0;
+
+	return 0;
+}
+
+static int oob_sm_small_ooblayout_free(struct mtd_info *mtd, int section,
+				       struct mtd_oob_region *oobregion)
+{
+	switch (section) {
+	case 0:
+		/* reserved */
+		oobregion->offset = 3;
+		oobregion->length = 2;
+		break;
+	case 1:
+		/* LBA1 */
+		oobregion->offset = 6;
+		oobregion->length = 2;
+		break;
+	default:
+		return -ERANGE;
 	}
-};
 
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops oob_sm_small_ops = {
+	.ecc = oob_sm_small_ooblayout_ecc,
+	.free = oob_sm_small_ooblayout_free,
+};
 
 static int sm_block_markbad(struct mtd_info *mtd, loff_t ofs)
 {
@@ -121,9 +182,9 @@ int sm_register_device(struct mtd_info *mtd, int smartmedia)
 
 	/* ECC layout */
 	if (mtd->writesize == SM_SECTOR_SIZE)
-		chip->ecc.layout = &nand_oob_sm;
+		mtd_set_ooblayout(mtd, &oob_sm_ops);
 	else if (mtd->writesize == SM_SMALL_PAGE)
-		chip->ecc.layout = &nand_oob_sm_small;
+		mtd_set_ooblayout(mtd, &oob_sm_small_ops);
 	else
 		return -ENODEV;
 
-- 
2.5.0

[PATCH v5 44/50] mtd: nand: sunxi: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/sunxi_nand.c | 114 +++++++++++++++++++-----------------------
 1 file changed, 52 insertions(+), 62 deletions(-)

diff --git a/drivers/mtd/nand/sunxi_nand.c b/drivers/mtd/nand/sunxi_nand.c
index 1c03eee..4b9d984 100644
--- a/drivers/mtd/nand/sunxi_nand.c
+++ b/drivers/mtd/nand/sunxi_nand.c
@@ -212,12 +212,9 @@ struct sunxi_nand_chip_sel {
  * sunxi HW ECC infos: stores information related to HW ECC support
  *
  * @mode:	the sunxi ECC mode field deduced from ECC requirements
- * @layout:	the OOB layout depending on the ECC requirements and the
- *		selected ECC mode
  */
 struct sunxi_nand_hw_ecc {
 	int mode;
-	struct nand_ecclayout layout;
 };
 
 /*
@@ -1257,6 +1254,57 @@ static int sunxi_nand_chip_init_timings(struct sunxi_nand_chip *chip,
 	return sunxi_nand_chip_set_timings(chip, timings);
 }
 
+static int sunxi_nand_ooblayout_ecc(struct mtd_info *mtd, int section,
+				    struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *nand = mtd_to_nand(mtd);
+	struct nand_ecc_ctrl *ecc = &nand->ecc;
+
+	if (section >= ecc->steps)
+		return -ERANGE;
+
+	oobregion->offset = section * (ecc->bytes + 4) + 4;
+	oobregion->length = ecc->bytes;
+
+	return 0;
+}
+
+static int sunxi_nand_ooblayout_free(struct mtd_info *mtd, int section,
+				     struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *nand = mtd_to_nand(mtd);
+	struct nand_ecc_ctrl *ecc = &nand->ecc;
+
+	if (section > ecc->steps)
+		return -ERANGE;
+
+	/*
+	 * The first 2 bytes are used for BB markers, hence we
+	 * only have 2 bytes available in the first user data
+	 * section.
+	 */
+	if (!section && ecc->mode == NAND_ECC_HW) {
+		oobregion->offset = 2;
+		oobregion->length = 2;
+
+		return 0;
+	}
+
+	oobregion->offset = section * (ecc->bytes + 4);
+
+	if (section < ecc->steps)
+		oobregion->length = 4;
+	else
+		oobregion->offset = mtd->oobsize - oobregion->offset;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops sunxi_nand_ooblayout_ops = {
+	.ecc = sunxi_nand_ooblayout_ecc,
+	.free = sunxi_nand_ooblayout_free,
+};
+
 static int sunxi_nand_hw_common_ecc_ctrl_init(struct mtd_info *mtd,
 					      struct nand_ecc_ctrl *ecc,
 					      struct device_node *np)
@@ -1266,7 +1314,6 @@ static int sunxi_nand_hw_common_ecc_ctrl_init(struct mtd_info *mtd,
 	struct sunxi_nand_chip *sunxi_nand = to_sunxi_nand(nand);
 	struct sunxi_nfc *nfc = to_sunxi_nfc(sunxi_nand->nand.controller);
 	struct sunxi_nand_hw_ecc *data;
-	struct nand_ecclayout *layout;
 	int nsectors;
 	int ret;
 	int i;
@@ -1295,7 +1342,6 @@ static int sunxi_nand_hw_common_ecc_ctrl_init(struct mtd_info *mtd,
 	/* HW ECC always work with even numbers of ECC bytes */
 	ecc->bytes = ALIGN(ecc->bytes, 2);
 
-	layout = &data->layout;
 	nsectors = mtd->writesize / ecc->size;
 
 	if (mtd->oobsize < ((ecc->bytes + 4) * nsectors)) {
@@ -1303,9 +1349,7 @@ static int sunxi_nand_hw_common_ecc_ctrl_init(struct mtd_info *mtd,
 		goto err;
 	}
 
-	layout->eccbytes = (ecc->bytes * nsectors);
-
-	ecc->layout = layout;
+	mtd_set_ooblayout(mtd, &sunxi_nand_ooblayout_ops);
 	ecc->priv = data;
 
 	return 0;
@@ -1325,9 +1369,6 @@ static int sunxi_nand_hw_ecc_ctrl_init(struct mtd_info *mtd,
 				       struct nand_ecc_ctrl *ecc,
 				       struct device_node *np)
 {
-	struct nand_ecclayout *layout;
-	int nsectors;
-	int i, j;
 	int ret;
 
 	ret = sunxi_nand_hw_common_ecc_ctrl_init(mtd, ecc, np);
@@ -1336,40 +1377,6 @@ static int sunxi_nand_hw_ecc_ctrl_init(struct mtd_info *mtd,
 
 	ecc->read_page = sunxi_nfc_hw_ecc_read_page;
 	ecc->write_page = sunxi_nfc_hw_ecc_write_page;
-	layout = ecc->layout;
-	nsectors = mtd->writesize / ecc->size;
-
-	for (i = 0; i < nsectors; i++) {
-		if (i) {
-			layout->oobfree[i].offset =
-				layout->oobfree[i - 1].offset +
-				layout->oobfree[i - 1].length +
-				ecc->bytes;
-			layout->oobfree[i].length = 4;
-		} else {
-			/*
-			 * The first 2 bytes are used for BB markers, hence we
-			 * only have 2 bytes available in the first user data
-			 * section.
-			 */
-			layout->oobfree[i].length = 2;
-			layout->oobfree[i].offset = 2;
-		}
-
-		for (j = 0; j < ecc->bytes; j++)
-			layout->eccpos[(ecc->bytes * i) + j] =
-					layout->oobfree[i].offset +
-					layout->oobfree[i].length + j;
-	}
-
-	if (mtd->oobsize > (ecc->bytes + 4) * nsectors) {
-		layout->oobfree[nsectors].offset =
-				layout->oobfree[nsectors - 1].offset +
-				layout->oobfree[nsectors - 1].length +
-				ecc->bytes;
-		layout->oobfree[nsectors].length = mtd->oobsize -
-				((ecc->bytes + 4) * nsectors);
-	}
 
 	return 0;
 }
@@ -1378,9 +1385,6 @@ static int sunxi_nand_hw_syndrome_ecc_ctrl_init(struct mtd_info *mtd,
 						struct nand_ecc_ctrl *ecc,
 						struct device_node *np)
 {
-	struct nand_ecclayout *layout;
-	int nsectors;
-	int i;
 	int ret;
 
 	ret = sunxi_nand_hw_common_ecc_ctrl_init(mtd, ecc, np);
@@ -1391,15 +1395,6 @@ static int sunxi_nand_hw_syndrome_ecc_ctrl_init(struct mtd_info *mtd,
 	ecc->read_page = sunxi_nfc_hw_syndrome_ecc_read_page;
 	ecc->write_page = sunxi_nfc_hw_syndrome_ecc_write_page;
 
-	layout = ecc->layout;
-	nsectors = mtd->writesize / ecc->size;
-
-	for (i = 0; i < (ecc->bytes * nsectors); i++)
-		layout->eccpos[i] = i;
-
-	layout->oobfree[0].length = mtd->oobsize - i;
-	layout->oobfree[0].offset = i;
-
 	return 0;
 }
 
@@ -1411,7 +1406,6 @@ static void sunxi_nand_ecc_cleanup(struct nand_ecc_ctrl *ecc)
 		sunxi_nand_hw_common_ecc_ctrl_cleanup(ecc);
 		break;
 	case NAND_ECC_NONE:
-		kfree(ecc->layout);
 	default:
 		break;
 	}
@@ -1445,10 +1439,6 @@ static int sunxi_nand_ecc_init(struct mtd_info *mtd, struct nand_ecc_ctrl *ecc,
 			return ret;
 		break;
 	case NAND_ECC_NONE:
-		ecc->layout = kzalloc(sizeof(*ecc->layout), GFP_KERNEL);
-		if (!ecc->layout)
-			return -ENOMEM;
-		ecc->layout->oobfree[0].length = mtd->oobsize;
 	case NAND_ECC_SOFT:
 		break;
 	default:
-- 
2.5.0

[PATCH v5 44/50] mtd: nand: sunxi: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/mtd/nand/sunxi_nand.c | 114 +++++++++++++++++++-----------------------
 1 file changed, 52 insertions(+), 62 deletions(-)

diff --git a/drivers/mtd/nand/sunxi_nand.c b/drivers/mtd/nand/sunxi_nand.c
index 1c03eee..4b9d984 100644
--- a/drivers/mtd/nand/sunxi_nand.c
+++ b/drivers/mtd/nand/sunxi_nand.c
@@ -212,12 +212,9 @@ struct sunxi_nand_chip_sel {
  * sunxi HW ECC infos: stores information related to HW ECC support
  *
  * @mode:	the sunxi ECC mode field deduced from ECC requirements
- * @layout:	the OOB layout depending on the ECC requirements and the
- *		selected ECC mode
  */
 struct sunxi_nand_hw_ecc {
 	int mode;
-	struct nand_ecclayout layout;
 };
 
 /*
@@ -1257,6 +1254,57 @@ static int sunxi_nand_chip_init_timings(struct sunxi_nand_chip *chip,
 	return sunxi_nand_chip_set_timings(chip, timings);
 }
 
+static int sunxi_nand_ooblayout_ecc(struct mtd_info *mtd, int section,
+				    struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *nand = mtd_to_nand(mtd);
+	struct nand_ecc_ctrl *ecc = &nand->ecc;
+
+	if (section >= ecc->steps)
+		return -ERANGE;
+
+	oobregion->offset = section * (ecc->bytes + 4) + 4;
+	oobregion->length = ecc->bytes;
+
+	return 0;
+}
+
+static int sunxi_nand_ooblayout_free(struct mtd_info *mtd, int section,
+				     struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *nand = mtd_to_nand(mtd);
+	struct nand_ecc_ctrl *ecc = &nand->ecc;
+
+	if (section > ecc->steps)
+		return -ERANGE;
+
+	/*
+	 * The first 2 bytes are used for BB markers, hence we
+	 * only have 2 bytes available in the first user data
+	 * section.
+	 */
+	if (!section && ecc->mode == NAND_ECC_HW) {
+		oobregion->offset = 2;
+		oobregion->length = 2;
+
+		return 0;
+	}
+
+	oobregion->offset = section * (ecc->bytes + 4);
+
+	if (section < ecc->steps)
+		oobregion->length = 4;
+	else
+		oobregion->offset = mtd->oobsize - oobregion->offset;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops sunxi_nand_ooblayout_ops = {
+	.ecc = sunxi_nand_ooblayout_ecc,
+	.free = sunxi_nand_ooblayout_free,
+};
+
 static int sunxi_nand_hw_common_ecc_ctrl_init(struct mtd_info *mtd,
 					      struct nand_ecc_ctrl *ecc,
 					      struct device_node *np)
@@ -1266,7 +1314,6 @@ static int sunxi_nand_hw_common_ecc_ctrl_init(struct mtd_info *mtd,
 	struct sunxi_nand_chip *sunxi_nand = to_sunxi_nand(nand);
 	struct sunxi_nfc *nfc = to_sunxi_nfc(sunxi_nand->nand.controller);
 	struct sunxi_nand_hw_ecc *data;
-	struct nand_ecclayout *layout;
 	int nsectors;
 	int ret;
 	int i;
@@ -1295,7 +1342,6 @@ static int sunxi_nand_hw_common_ecc_ctrl_init(struct mtd_info *mtd,
 	/* HW ECC always work with even numbers of ECC bytes */
 	ecc->bytes = ALIGN(ecc->bytes, 2);
 
-	layout = &data->layout;
 	nsectors = mtd->writesize / ecc->size;
 
 	if (mtd->oobsize < ((ecc->bytes + 4) * nsectors)) {
@@ -1303,9 +1349,7 @@ static int sunxi_nand_hw_common_ecc_ctrl_init(struct mtd_info *mtd,
 		goto err;
 	}
 
-	layout->eccbytes = (ecc->bytes * nsectors);
-
-	ecc->layout = layout;
+	mtd_set_ooblayout(mtd, &sunxi_nand_ooblayout_ops);
 	ecc->priv = data;
 
 	return 0;
@@ -1325,9 +1369,6 @@ static int sunxi_nand_hw_ecc_ctrl_init(struct mtd_info *mtd,
 				       struct nand_ecc_ctrl *ecc,
 				       struct device_node *np)
 {
-	struct nand_ecclayout *layout;
-	int nsectors;
-	int i, j;
 	int ret;
 
 	ret = sunxi_nand_hw_common_ecc_ctrl_init(mtd, ecc, np);
@@ -1336,40 +1377,6 @@ static int sunxi_nand_hw_ecc_ctrl_init(struct mtd_info *mtd,
 
 	ecc->read_page = sunxi_nfc_hw_ecc_read_page;
 	ecc->write_page = sunxi_nfc_hw_ecc_write_page;
-	layout = ecc->layout;
-	nsectors = mtd->writesize / ecc->size;
-
-	for (i = 0; i < nsectors; i++) {
-		if (i) {
-			layout->oobfree[i].offset =
-				layout->oobfree[i - 1].offset +
-				layout->oobfree[i - 1].length +
-				ecc->bytes;
-			layout->oobfree[i].length = 4;
-		} else {
-			/*
-			 * The first 2 bytes are used for BB markers, hence we
-			 * only have 2 bytes available in the first user data
-			 * section.
-			 */
-			layout->oobfree[i].length = 2;
-			layout->oobfree[i].offset = 2;
-		}
-
-		for (j = 0; j < ecc->bytes; j++)
-			layout->eccpos[(ecc->bytes * i) + j] =
-					layout->oobfree[i].offset +
-					layout->oobfree[i].length + j;
-	}
-
-	if (mtd->oobsize > (ecc->bytes + 4) * nsectors) {
-		layout->oobfree[nsectors].offset =
-				layout->oobfree[nsectors - 1].offset +
-				layout->oobfree[nsectors - 1].length +
-				ecc->bytes;
-		layout->oobfree[nsectors].length = mtd->oobsize -
-				((ecc->bytes + 4) * nsectors);
-	}
 
 	return 0;
 }
@@ -1378,9 +1385,6 @@ static int sunxi_nand_hw_syndrome_ecc_ctrl_init(struct mtd_info *mtd,
 						struct nand_ecc_ctrl *ecc,
 						struct device_node *np)
 {
-	struct nand_ecclayout *layout;
-	int nsectors;
-	int i;
 	int ret;
 
 	ret = sunxi_nand_hw_common_ecc_ctrl_init(mtd, ecc, np);
@@ -1391,15 +1395,6 @@ static int sunxi_nand_hw_syndrome_ecc_ctrl_init(struct mtd_info *mtd,
 	ecc->read_page = sunxi_nfc_hw_syndrome_ecc_read_page;
 	ecc->write_page = sunxi_nfc_hw_syndrome_ecc_write_page;
 
-	layout = ecc->layout;
-	nsectors = mtd->writesize / ecc->size;
-
-	for (i = 0; i < (ecc->bytes * nsectors); i++)
-		layout->eccpos[i] = i;
-
-	layout->oobfree[0].length = mtd->oobsize - i;
-	layout->oobfree[0].offset = i;
-
 	return 0;
 }
 
@@ -1411,7 +1406,6 @@ static void sunxi_nand_ecc_cleanup(struct nand_ecc_ctrl *ecc)
 		sunxi_nand_hw_common_ecc_ctrl_cleanup(ecc);
 		break;
 	case NAND_ECC_NONE:
-		kfree(ecc->layout);
 	default:
 		break;
 	}
@@ -1445,10 +1439,6 @@ static int sunxi_nand_ecc_init(struct mtd_info *mtd, struct nand_ecc_ctrl *ecc,
 			return ret;
 		break;
 	case NAND_ECC_NONE:
-		ecc->layout = kzalloc(sizeof(*ecc->layout), GFP_KERNEL);
-		if (!ecc->layout)
-			return -ENOMEM;
-		ecc->layout->oobfree[0].length = mtd->oobsize;
 	case NAND_ECC_SOFT:
 		break;
 	default:
-- 
2.5.0

[PATCH v5 44/50] mtd: nand: sunxi: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/sunxi_nand.c | 114 +++++++++++++++++++-----------------------
 1 file changed, 52 insertions(+), 62 deletions(-)

diff --git a/drivers/mtd/nand/sunxi_nand.c b/drivers/mtd/nand/sunxi_nand.c
index 1c03eee..4b9d984 100644
--- a/drivers/mtd/nand/sunxi_nand.c
+++ b/drivers/mtd/nand/sunxi_nand.c
@@ -212,12 +212,9 @@ struct sunxi_nand_chip_sel {
  * sunxi HW ECC infos: stores information related to HW ECC support
  *
  * @mode:	the sunxi ECC mode field deduced from ECC requirements
- * @layout:	the OOB layout depending on the ECC requirements and the
- *		selected ECC mode
  */
 struct sunxi_nand_hw_ecc {
 	int mode;
-	struct nand_ecclayout layout;
 };
 
 /*
@@ -1257,6 +1254,57 @@ static int sunxi_nand_chip_init_timings(struct sunxi_nand_chip *chip,
 	return sunxi_nand_chip_set_timings(chip, timings);
 }
 
+static int sunxi_nand_ooblayout_ecc(struct mtd_info *mtd, int section,
+				    struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *nand = mtd_to_nand(mtd);
+	struct nand_ecc_ctrl *ecc = &nand->ecc;
+
+	if (section >= ecc->steps)
+		return -ERANGE;
+
+	oobregion->offset = section * (ecc->bytes + 4) + 4;
+	oobregion->length = ecc->bytes;
+
+	return 0;
+}
+
+static int sunxi_nand_ooblayout_free(struct mtd_info *mtd, int section,
+				     struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *nand = mtd_to_nand(mtd);
+	struct nand_ecc_ctrl *ecc = &nand->ecc;
+
+	if (section > ecc->steps)
+		return -ERANGE;
+
+	/*
+	 * The first 2 bytes are used for BB markers, hence we
+	 * only have 2 bytes available in the first user data
+	 * section.
+	 */
+	if (!section && ecc->mode == NAND_ECC_HW) {
+		oobregion->offset = 2;
+		oobregion->length = 2;
+
+		return 0;
+	}
+
+	oobregion->offset = section * (ecc->bytes + 4);
+
+	if (section < ecc->steps)
+		oobregion->length = 4;
+	else
+		oobregion->offset = mtd->oobsize - oobregion->offset;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops sunxi_nand_ooblayout_ops = {
+	.ecc = sunxi_nand_ooblayout_ecc,
+	.free = sunxi_nand_ooblayout_free,
+};
+
 static int sunxi_nand_hw_common_ecc_ctrl_init(struct mtd_info *mtd,
 					      struct nand_ecc_ctrl *ecc,
 					      struct device_node *np)
@@ -1266,7 +1314,6 @@ static int sunxi_nand_hw_common_ecc_ctrl_init(struct mtd_info *mtd,
 	struct sunxi_nand_chip *sunxi_nand = to_sunxi_nand(nand);
 	struct sunxi_nfc *nfc = to_sunxi_nfc(sunxi_nand->nand.controller);
 	struct sunxi_nand_hw_ecc *data;
-	struct nand_ecclayout *layout;
 	int nsectors;
 	int ret;
 	int i;
@@ -1295,7 +1342,6 @@ static int sunxi_nand_hw_common_ecc_ctrl_init(struct mtd_info *mtd,
 	/* HW ECC always work with even numbers of ECC bytes */
 	ecc->bytes = ALIGN(ecc->bytes, 2);
 
-	layout = &data->layout;
 	nsectors = mtd->writesize / ecc->size;
 
 	if (mtd->oobsize < ((ecc->bytes + 4) * nsectors)) {
@@ -1303,9 +1349,7 @@ static int sunxi_nand_hw_common_ecc_ctrl_init(struct mtd_info *mtd,
 		goto err;
 	}
 
-	layout->eccbytes = (ecc->bytes * nsectors);
-
-	ecc->layout = layout;
+	mtd_set_ooblayout(mtd, &sunxi_nand_ooblayout_ops);
 	ecc->priv = data;
 
 	return 0;
@@ -1325,9 +1369,6 @@ static int sunxi_nand_hw_ecc_ctrl_init(struct mtd_info *mtd,
 				       struct nand_ecc_ctrl *ecc,
 				       struct device_node *np)
 {
-	struct nand_ecclayout *layout;
-	int nsectors;
-	int i, j;
 	int ret;
 
 	ret = sunxi_nand_hw_common_ecc_ctrl_init(mtd, ecc, np);
@@ -1336,40 +1377,6 @@ static int sunxi_nand_hw_ecc_ctrl_init(struct mtd_info *mtd,
 
 	ecc->read_page = sunxi_nfc_hw_ecc_read_page;
 	ecc->write_page = sunxi_nfc_hw_ecc_write_page;
-	layout = ecc->layout;
-	nsectors = mtd->writesize / ecc->size;
-
-	for (i = 0; i < nsectors; i++) {
-		if (i) {
-			layout->oobfree[i].offset =
-				layout->oobfree[i - 1].offset +
-				layout->oobfree[i - 1].length +
-				ecc->bytes;
-			layout->oobfree[i].length = 4;
-		} else {
-			/*
-			 * The first 2 bytes are used for BB markers, hence we
-			 * only have 2 bytes available in the first user data
-			 * section.
-			 */
-			layout->oobfree[i].length = 2;
-			layout->oobfree[i].offset = 2;
-		}
-
-		for (j = 0; j < ecc->bytes; j++)
-			layout->eccpos[(ecc->bytes * i) + j] =
-					layout->oobfree[i].offset +
-					layout->oobfree[i].length + j;
-	}
-
-	if (mtd->oobsize > (ecc->bytes + 4) * nsectors) {
-		layout->oobfree[nsectors].offset =
-				layout->oobfree[nsectors - 1].offset +
-				layout->oobfree[nsectors - 1].length +
-				ecc->bytes;
-		layout->oobfree[nsectors].length = mtd->oobsize -
-				((ecc->bytes + 4) * nsectors);
-	}
 
 	return 0;
 }
@@ -1378,9 +1385,6 @@ static int sunxi_nand_hw_syndrome_ecc_ctrl_init(struct mtd_info *mtd,
 						struct nand_ecc_ctrl *ecc,
 						struct device_node *np)
 {
-	struct nand_ecclayout *layout;
-	int nsectors;
-	int i;
 	int ret;
 
 	ret = sunxi_nand_hw_common_ecc_ctrl_init(mtd, ecc, np);
@@ -1391,15 +1395,6 @@ static int sunxi_nand_hw_syndrome_ecc_ctrl_init(struct mtd_info *mtd,
 	ecc->read_page = sunxi_nfc_hw_syndrome_ecc_read_page;
 	ecc->write_page = sunxi_nfc_hw_syndrome_ecc_write_page;
 
-	layout = ecc->layout;
-	nsectors = mtd->writesize / ecc->size;
-
-	for (i = 0; i < (ecc->bytes * nsectors); i++)
-		layout->eccpos[i] = i;
-
-	layout->oobfree[0].length = mtd->oobsize - i;
-	layout->oobfree[0].offset = i;
-
 	return 0;
 }
 
@@ -1411,7 +1406,6 @@ static void sunxi_nand_ecc_cleanup(struct nand_ecc_ctrl *ecc)
 		sunxi_nand_hw_common_ecc_ctrl_cleanup(ecc);
 		break;
 	case NAND_ECC_NONE:
-		kfree(ecc->layout);
 	default:
 		break;
 	}
@@ -1445,10 +1439,6 @@ static int sunxi_nand_ecc_init(struct mtd_info *mtd, struct nand_ecc_ctrl *ecc,
 			return ret;
 		break;
 	case NAND_ECC_NONE:
-		ecc->layout = kzalloc(sizeof(*ecc->layout), GFP_KERNEL);
-		if (!ecc->layout)
-			return -ENOMEM;
-		ecc->layout->oobfree[0].length = mtd->oobsize;
 	case NAND_ECC_SOFT:
 		break;
 	default:
-- 
2.5.0

[PATCH v5 45/50] mtd: nand: vf610: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/vf610_nfc.c | 34 ++++------------------------------
 1 file changed, 4 insertions(+), 30 deletions(-)

diff --git a/drivers/mtd/nand/vf610_nfc.c b/drivers/mtd/nand/vf610_nfc.c
index 293feb1..da34de1 100644
--- a/drivers/mtd/nand/vf610_nfc.c
+++ b/drivers/mtd/nand/vf610_nfc.c
@@ -175,34 +175,6 @@ static inline struct vf610_nfc *mtd_to_nfc(struct mtd_info *mtd)
 	return container_of(mtd_to_nand(mtd), struct vf610_nfc, chip);
 }
 
-static struct nand_ecclayout vf610_nfc_ecc45 = {
-	.eccbytes = 45,
-	.eccpos = {19, 20, 21, 22, 23,
-		   24, 25, 26, 27, 28, 29, 30, 31,
-		   32, 33, 34, 35, 36, 37, 38, 39,
-		   40, 41, 42, 43, 44, 45, 46, 47,
-		   48, 49, 50, 51, 52, 53, 54, 55,
-		   56, 57, 58, 59, 60, 61, 62, 63},
-	.oobfree = {
-		{.offset = 2,
-		 .length = 17} }
-};
-
-static struct nand_ecclayout vf610_nfc_ecc60 = {
-	.eccbytes = 60,
-	.eccpos = { 4,  5,  6,  7,  8,  9, 10, 11,
-		   12, 13, 14, 15, 16, 17, 18, 19,
-		   20, 21, 22, 23, 24, 25, 26, 27,
-		   28, 29, 30, 31, 32, 33, 34, 35,
-		   36, 37, 38, 39, 40, 41, 42, 43,
-		   44, 45, 46, 47, 48, 49, 50, 51,
-		   52, 53, 54, 55, 56, 57, 58, 59,
-		   60, 61, 62, 63 },
-	.oobfree = {
-		{.offset = 2,
-		 .length = 2} }
-};
-
 static inline u32 vf610_nfc_read(struct vf610_nfc *nfc, uint reg)
 {
 	return readl(nfc->regs + reg);
@@ -781,14 +753,16 @@ static int vf610_nfc_probe(struct platform_device *pdev)
 		if (mtd->oobsize > 64)
 			mtd->oobsize = 64;
 
+		/*
+		 * mtd->ecclayout is not specified here because we're using the
+		 * default large page ECC layout defined in NAND core.
+		 */
 		if (chip->ecc.strength == 32) {
 			nfc->ecc_mode = ECC_60_BYTE;
 			chip->ecc.bytes = 60;
-			chip->ecc.layout = &vf610_nfc_ecc60;
 		} else if (chip->ecc.strength == 24) {
 			nfc->ecc_mode = ECC_45_BYTE;
 			chip->ecc.bytes = 45;
-			chip->ecc.layout = &vf610_nfc_ecc45;
 		} else {
 			dev_err(nfc->dev, "Unsupported ECC strength\n");
 			err = -ENXIO;
-- 
2.5.0

[PATCH v5 45/50] mtd: nand: vf610: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/mtd/nand/vf610_nfc.c | 34 ++++------------------------------
 1 file changed, 4 insertions(+), 30 deletions(-)

diff --git a/drivers/mtd/nand/vf610_nfc.c b/drivers/mtd/nand/vf610_nfc.c
index 293feb1..da34de1 100644
--- a/drivers/mtd/nand/vf610_nfc.c
+++ b/drivers/mtd/nand/vf610_nfc.c
@@ -175,34 +175,6 @@ static inline struct vf610_nfc *mtd_to_nfc(struct mtd_info *mtd)
 	return container_of(mtd_to_nand(mtd), struct vf610_nfc, chip);
 }
 
-static struct nand_ecclayout vf610_nfc_ecc45 = {
-	.eccbytes = 45,
-	.eccpos = {19, 20, 21, 22, 23,
-		   24, 25, 26, 27, 28, 29, 30, 31,
-		   32, 33, 34, 35, 36, 37, 38, 39,
-		   40, 41, 42, 43, 44, 45, 46, 47,
-		   48, 49, 50, 51, 52, 53, 54, 55,
-		   56, 57, 58, 59, 60, 61, 62, 63},
-	.oobfree = {
-		{.offset = 2,
-		 .length = 17} }
-};
-
-static struct nand_ecclayout vf610_nfc_ecc60 = {
-	.eccbytes = 60,
-	.eccpos = { 4,  5,  6,  7,  8,  9, 10, 11,
-		   12, 13, 14, 15, 16, 17, 18, 19,
-		   20, 21, 22, 23, 24, 25, 26, 27,
-		   28, 29, 30, 31, 32, 33, 34, 35,
-		   36, 37, 38, 39, 40, 41, 42, 43,
-		   44, 45, 46, 47, 48, 49, 50, 51,
-		   52, 53, 54, 55, 56, 57, 58, 59,
-		   60, 61, 62, 63 },
-	.oobfree = {
-		{.offset = 2,
-		 .length = 2} }
-};
-
 static inline u32 vf610_nfc_read(struct vf610_nfc *nfc, uint reg)
 {
 	return readl(nfc->regs + reg);
@@ -781,14 +753,16 @@ static int vf610_nfc_probe(struct platform_device *pdev)
 		if (mtd->oobsize > 64)
 			mtd->oobsize = 64;
 
+		/*
+		 * mtd->ecclayout is not specified here because we're using the
+		 * default large page ECC layout defined in NAND core.
+		 */
 		if (chip->ecc.strength == 32) {
 			nfc->ecc_mode = ECC_60_BYTE;
 			chip->ecc.bytes = 60;
-			chip->ecc.layout = &vf610_nfc_ecc60;
 		} else if (chip->ecc.strength == 24) {
 			nfc->ecc_mode = ECC_45_BYTE;
 			chip->ecc.bytes = 45;
-			chip->ecc.layout = &vf610_nfc_ecc45;
 		} else {
 			dev_err(nfc->dev, "Unsupported ECC strength\n");
 			err = -ENXIO;
-- 
2.5.0

[PATCH v5 45/50] mtd: nand: vf610: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/vf610_nfc.c | 34 ++++------------------------------
 1 file changed, 4 insertions(+), 30 deletions(-)

diff --git a/drivers/mtd/nand/vf610_nfc.c b/drivers/mtd/nand/vf610_nfc.c
index 293feb1..da34de1 100644
--- a/drivers/mtd/nand/vf610_nfc.c
+++ b/drivers/mtd/nand/vf610_nfc.c
@@ -175,34 +175,6 @@ static inline struct vf610_nfc *mtd_to_nfc(struct mtd_info *mtd)
 	return container_of(mtd_to_nand(mtd), struct vf610_nfc, chip);
 }
 
-static struct nand_ecclayout vf610_nfc_ecc45 = {
-	.eccbytes = 45,
-	.eccpos = {19, 20, 21, 22, 23,
-		   24, 25, 26, 27, 28, 29, 30, 31,
-		   32, 33, 34, 35, 36, 37, 38, 39,
-		   40, 41, 42, 43, 44, 45, 46, 47,
-		   48, 49, 50, 51, 52, 53, 54, 55,
-		   56, 57, 58, 59, 60, 61, 62, 63},
-	.oobfree = {
-		{.offset = 2,
-		 .length = 17} }
-};
-
-static struct nand_ecclayout vf610_nfc_ecc60 = {
-	.eccbytes = 60,
-	.eccpos = { 4,  5,  6,  7,  8,  9, 10, 11,
-		   12, 13, 14, 15, 16, 17, 18, 19,
-		   20, 21, 22, 23, 24, 25, 26, 27,
-		   28, 29, 30, 31, 32, 33, 34, 35,
-		   36, 37, 38, 39, 40, 41, 42, 43,
-		   44, 45, 46, 47, 48, 49, 50, 51,
-		   52, 53, 54, 55, 56, 57, 58, 59,
-		   60, 61, 62, 63 },
-	.oobfree = {
-		{.offset = 2,
-		 .length = 2} }
-};
-
 static inline u32 vf610_nfc_read(struct vf610_nfc *nfc, uint reg)
 {
 	return readl(nfc->regs + reg);
@@ -781,14 +753,16 @@ static int vf610_nfc_probe(struct platform_device *pdev)
 		if (mtd->oobsize > 64)
 			mtd->oobsize = 64;
 
+		/*
+		 * mtd->ecclayout is not specified here because we're using the
+		 * default large page ECC layout defined in NAND core.
+		 */
 		if (chip->ecc.strength == 32) {
 			nfc->ecc_mode = ECC_60_BYTE;
 			chip->ecc.bytes = 60;
-			chip->ecc.layout = &vf610_nfc_ecc60;
 		} else if (chip->ecc.strength == 24) {
 			nfc->ecc_mode = ECC_45_BYTE;
 			chip->ecc.bytes = 45;
-			chip->ecc.layout = &vf610_nfc_ecc45;
 		} else {
 			dev_err(nfc->dev, "Unsupported ECC strength\n");
 			err = -ENXIO;
-- 
2.5.0

[PATCH v5 46/50] mtd: nand: qcom: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Tested-by: Archit Taneja <architt@codeaurora.org>
---
 drivers/mtd/nand/qcom_nandc.c | 79 +++++++++++++++++++------------------------
 1 file changed, 34 insertions(+), 45 deletions(-)

diff --git a/drivers/mtd/nand/qcom_nandc.c b/drivers/mtd/nand/qcom_nandc.c
index 012c202..8c3db3c 100644
--- a/drivers/mtd/nand/qcom_nandc.c
+++ b/drivers/mtd/nand/qcom_nandc.c
@@ -1708,61 +1708,52 @@ static void qcom_nandc_select_chip(struct mtd_info *mtd, int chipnr)
  * This layout is read as is when ECC is disabled. When ECC is enabled, the
  * inaccessible Bad Block byte(s) are ignored when we write to a page/oob,
  * and assumed as 0xffs when we read a page/oob. The ECC, unused and
- * dummy/real bad block bytes are grouped as ecc bytes in nand_ecclayout (i.e,
- * ecc->bytes is the sum of the three).
+ * dummy/real bad block bytes are grouped as ecc bytes (i.e, ecc->bytes is
+ * the sum of the three).
  */
-
-static struct nand_ecclayout *
-qcom_nand_create_layout(struct qcom_nand_host *host)
+static int qcom_nand_ooblayout_ecc(struct mtd_info *mtd, int section,
+				   struct mtd_oob_region *oobregion)
 {
-	struct nand_chip *chip = &host->chip;
-	struct mtd_info *mtd = nand_to_mtd(chip);
-	struct qcom_nand_controller *nandc = get_qcom_nand_controller(chip);
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct qcom_nand_host *host = to_qcom_nand_host(chip);
 	struct nand_ecc_ctrl *ecc = &chip->ecc;
-	struct nand_ecclayout *layout;
-	int i, j, steps, pos = 0, shift = 0;
 
-	layout = devm_kzalloc(nandc->dev, sizeof(*layout), GFP_KERNEL);
-	if (!layout)
-		return NULL;
+	if (section > 1)
+		return -ERANGE;
 
-	steps = mtd->writesize / ecc->size;
-	layout->eccbytes = steps * ecc->bytes;
-
-	layout->oobfree[0].offset = (steps - 1) * ecc->bytes + host->bbm_size;
-	layout->oobfree[0].length = steps << 2;
-
-	/*
-	 * the oob bytes in the first n - 1 codewords are all grouped together
-	 * in the format:
-	 * DUMMY_BBM + UNUSED + ECC
-	 */
-	for (i = 0; i < steps - 1; i++) {
-		for (j = 0; j < ecc->bytes; j++)
-			layout->eccpos[pos++] = i * ecc->bytes + j;
+	if (!section) {
+		oobregion->length = (ecc->bytes * (ecc->steps - 1)) +
+				    host->bbm_size;
+		oobregion->offset = 0;
+	} else {
+		oobregion->length = host->ecc_bytes_hw + host->spare_bytes;
+		oobregion->offset = mtd->oobsize - oobregion->length;
 	}
 
-	/*
-	 * the oob bytes in the last codeword are grouped in the format:
-	 * BBM + FREE OOB + UNUSED + ECC
-	 */
+	return 0;
+}
 
-	/* fill up the bbm positions */
-	for (j = 0; j < host->bbm_size; j++)
-		layout->eccpos[pos++] = i * ecc->bytes + j;
+static int qcom_nand_ooblayout_free(struct mtd_info *mtd, int section,
+				    struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct qcom_nand_host *host = to_qcom_nand_host(chip);
+	struct nand_ecc_ctrl *ecc = &chip->ecc;
 
-	/*
-	 * fill up the ecc and reserved positions, their indices are offseted
-	 * by the free oob region
-	 */
-	shift = layout->oobfree[0].length + host->bbm_size;
+	if (section)
+		return -ERANGE;
 
-	for (j = 0; j < (host->ecc_bytes_hw + host->spare_bytes); j++)
-		layout->eccpos[pos++] = i * ecc->bytes + shift + j;
+	oobregion->length = ecc->steps * 4;
+	oobregion->offset = ((ecc->steps - 1) * ecc->bytes) + host->bbm_size;
 
-	return layout;
+	return 0;
 }
 
+static const struct mtd_ooblayout_ops qcom_nand_ooblayout_ops = {
+	.ecc = qcom_nand_ooblayout_ecc,
+	.free = qcom_nand_ooblayout_free,
+};
+
 static int qcom_nand_host_setup(struct qcom_nand_host *host)
 {
 	struct nand_chip *chip = &host->chip;
@@ -1849,9 +1840,7 @@ static int qcom_nand_host_setup(struct qcom_nand_host *host)
 
 	ecc->mode = NAND_ECC_HW;
 
-	ecc->layout = qcom_nand_create_layout(host);
-	if (!ecc->layout)
-		return -ENOMEM;
+	mtd_set_ooblayout(mtd, &qcom_nand_ooblayout_ops);
 
 	cwperpage = mtd->writesize / ecc->size;
 
-- 
2.5.0

[PATCH v5 46/50] mtd: nand: qcom: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
Tested-by: Archit Taneja <architt-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
---
 drivers/mtd/nand/qcom_nandc.c | 79 +++++++++++++++++++------------------------
 1 file changed, 34 insertions(+), 45 deletions(-)

diff --git a/drivers/mtd/nand/qcom_nandc.c b/drivers/mtd/nand/qcom_nandc.c
index 012c202..8c3db3c 100644
--- a/drivers/mtd/nand/qcom_nandc.c
+++ b/drivers/mtd/nand/qcom_nandc.c
@@ -1708,61 +1708,52 @@ static void qcom_nandc_select_chip(struct mtd_info *mtd, int chipnr)
  * This layout is read as is when ECC is disabled. When ECC is enabled, the
  * inaccessible Bad Block byte(s) are ignored when we write to a page/oob,
  * and assumed as 0xffs when we read a page/oob. The ECC, unused and
- * dummy/real bad block bytes are grouped as ecc bytes in nand_ecclayout (i.e,
- * ecc->bytes is the sum of the three).
+ * dummy/real bad block bytes are grouped as ecc bytes (i.e, ecc->bytes is
+ * the sum of the three).
  */
-
-static struct nand_ecclayout *
-qcom_nand_create_layout(struct qcom_nand_host *host)
+static int qcom_nand_ooblayout_ecc(struct mtd_info *mtd, int section,
+				   struct mtd_oob_region *oobregion)
 {
-	struct nand_chip *chip = &host->chip;
-	struct mtd_info *mtd = nand_to_mtd(chip);
-	struct qcom_nand_controller *nandc = get_qcom_nand_controller(chip);
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct qcom_nand_host *host = to_qcom_nand_host(chip);
 	struct nand_ecc_ctrl *ecc = &chip->ecc;
-	struct nand_ecclayout *layout;
-	int i, j, steps, pos = 0, shift = 0;
 
-	layout = devm_kzalloc(nandc->dev, sizeof(*layout), GFP_KERNEL);
-	if (!layout)
-		return NULL;
+	if (section > 1)
+		return -ERANGE;
 
-	steps = mtd->writesize / ecc->size;
-	layout->eccbytes = steps * ecc->bytes;
-
-	layout->oobfree[0].offset = (steps - 1) * ecc->bytes + host->bbm_size;
-	layout->oobfree[0].length = steps << 2;
-
-	/*
-	 * the oob bytes in the first n - 1 codewords are all grouped together
-	 * in the format:
-	 * DUMMY_BBM + UNUSED + ECC
-	 */
-	for (i = 0; i < steps - 1; i++) {
-		for (j = 0; j < ecc->bytes; j++)
-			layout->eccpos[pos++] = i * ecc->bytes + j;
+	if (!section) {
+		oobregion->length = (ecc->bytes * (ecc->steps - 1)) +
+				    host->bbm_size;
+		oobregion->offset = 0;
+	} else {
+		oobregion->length = host->ecc_bytes_hw + host->spare_bytes;
+		oobregion->offset = mtd->oobsize - oobregion->length;
 	}
 
-	/*
-	 * the oob bytes in the last codeword are grouped in the format:
-	 * BBM + FREE OOB + UNUSED + ECC
-	 */
+	return 0;
+}
 
-	/* fill up the bbm positions */
-	for (j = 0; j < host->bbm_size; j++)
-		layout->eccpos[pos++] = i * ecc->bytes + j;
+static int qcom_nand_ooblayout_free(struct mtd_info *mtd, int section,
+				    struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct qcom_nand_host *host = to_qcom_nand_host(chip);
+	struct nand_ecc_ctrl *ecc = &chip->ecc;
 
-	/*
-	 * fill up the ecc and reserved positions, their indices are offseted
-	 * by the free oob region
-	 */
-	shift = layout->oobfree[0].length + host->bbm_size;
+	if (section)
+		return -ERANGE;
 
-	for (j = 0; j < (host->ecc_bytes_hw + host->spare_bytes); j++)
-		layout->eccpos[pos++] = i * ecc->bytes + shift + j;
+	oobregion->length = ecc->steps * 4;
+	oobregion->offset = ((ecc->steps - 1) * ecc->bytes) + host->bbm_size;
 
-	return layout;
+	return 0;
 }
 
+static const struct mtd_ooblayout_ops qcom_nand_ooblayout_ops = {
+	.ecc = qcom_nand_ooblayout_ecc,
+	.free = qcom_nand_ooblayout_free,
+};
+
 static int qcom_nand_host_setup(struct qcom_nand_host *host)
 {
 	struct nand_chip *chip = &host->chip;
@@ -1849,9 +1840,7 @@ static int qcom_nand_host_setup(struct qcom_nand_host *host)
 
 	ecc->mode = NAND_ECC_HW;
 
-	ecc->layout = qcom_nand_create_layout(host);
-	if (!ecc->layout)
-		return -ENOMEM;
+	mtd_set_ooblayout(mtd, &qcom_nand_ooblayout_ops);
 
 	cwperpage = mtd->writesize / ecc->size;
 
-- 
2.5.0

[PATCH v5 46/50] mtd: nand: qcom: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Tested-by: Archit Taneja <architt@codeaurora.org>
---
 drivers/mtd/nand/qcom_nandc.c | 79 +++++++++++++++++++------------------------
 1 file changed, 34 insertions(+), 45 deletions(-)

diff --git a/drivers/mtd/nand/qcom_nandc.c b/drivers/mtd/nand/qcom_nandc.c
index 012c202..8c3db3c 100644
--- a/drivers/mtd/nand/qcom_nandc.c
+++ b/drivers/mtd/nand/qcom_nandc.c
@@ -1708,61 +1708,52 @@ static void qcom_nandc_select_chip(struct mtd_info *mtd, int chipnr)
  * This layout is read as is when ECC is disabled. When ECC is enabled, the
  * inaccessible Bad Block byte(s) are ignored when we write to a page/oob,
  * and assumed as 0xffs when we read a page/oob. The ECC, unused and
- * dummy/real bad block bytes are grouped as ecc bytes in nand_ecclayout (i.e,
- * ecc->bytes is the sum of the three).
+ * dummy/real bad block bytes are grouped as ecc bytes (i.e, ecc->bytes is
+ * the sum of the three).
  */
-
-static struct nand_ecclayout *
-qcom_nand_create_layout(struct qcom_nand_host *host)
+static int qcom_nand_ooblayout_ecc(struct mtd_info *mtd, int section,
+				   struct mtd_oob_region *oobregion)
 {
-	struct nand_chip *chip = &host->chip;
-	struct mtd_info *mtd = nand_to_mtd(chip);
-	struct qcom_nand_controller *nandc = get_qcom_nand_controller(chip);
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct qcom_nand_host *host = to_qcom_nand_host(chip);
 	struct nand_ecc_ctrl *ecc = &chip->ecc;
-	struct nand_ecclayout *layout;
-	int i, j, steps, pos = 0, shift = 0;
 
-	layout = devm_kzalloc(nandc->dev, sizeof(*layout), GFP_KERNEL);
-	if (!layout)
-		return NULL;
+	if (section > 1)
+		return -ERANGE;
 
-	steps = mtd->writesize / ecc->size;
-	layout->eccbytes = steps * ecc->bytes;
-
-	layout->oobfree[0].offset = (steps - 1) * ecc->bytes + host->bbm_size;
-	layout->oobfree[0].length = steps << 2;
-
-	/*
-	 * the oob bytes in the first n - 1 codewords are all grouped together
-	 * in the format:
-	 * DUMMY_BBM + UNUSED + ECC
-	 */
-	for (i = 0; i < steps - 1; i++) {
-		for (j = 0; j < ecc->bytes; j++)
-			layout->eccpos[pos++] = i * ecc->bytes + j;
+	if (!section) {
+		oobregion->length = (ecc->bytes * (ecc->steps - 1)) +
+				    host->bbm_size;
+		oobregion->offset = 0;
+	} else {
+		oobregion->length = host->ecc_bytes_hw + host->spare_bytes;
+		oobregion->offset = mtd->oobsize - oobregion->length;
 	}
 
-	/*
-	 * the oob bytes in the last codeword are grouped in the format:
-	 * BBM + FREE OOB + UNUSED + ECC
-	 */
+	return 0;
+}
 
-	/* fill up the bbm positions */
-	for (j = 0; j < host->bbm_size; j++)
-		layout->eccpos[pos++] = i * ecc->bytes + j;
+static int qcom_nand_ooblayout_free(struct mtd_info *mtd, int section,
+				    struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct qcom_nand_host *host = to_qcom_nand_host(chip);
+	struct nand_ecc_ctrl *ecc = &chip->ecc;
 
-	/*
-	 * fill up the ecc and reserved positions, their indices are offseted
-	 * by the free oob region
-	 */
-	shift = layout->oobfree[0].length + host->bbm_size;
+	if (section)
+		return -ERANGE;
 
-	for (j = 0; j < (host->ecc_bytes_hw + host->spare_bytes); j++)
-		layout->eccpos[pos++] = i * ecc->bytes + shift + j;
+	oobregion->length = ecc->steps * 4;
+	oobregion->offset = ((ecc->steps - 1) * ecc->bytes) + host->bbm_size;
 
-	return layout;
+	return 0;
 }
 
+static const struct mtd_ooblayout_ops qcom_nand_ooblayout_ops = {
+	.ecc = qcom_nand_ooblayout_ecc,
+	.free = qcom_nand_ooblayout_free,
+};
+
 static int qcom_nand_host_setup(struct qcom_nand_host *host)
 {
 	struct nand_chip *chip = &host->chip;
@@ -1849,9 +1840,7 @@ static int qcom_nand_host_setup(struct qcom_nand_host *host)
 
 	ecc->mode = NAND_ECC_HW;
 
-	ecc->layout = qcom_nand_create_layout(host);
-	if (!ecc->layout)
-		return -ENOMEM;
+	mtd_set_ooblayout(mtd, &qcom_nand_ooblayout_ops);
 
 	cwperpage = mtd->writesize / ecc->size;
 
-- 
2.5.0

[PATCH v5 47/50] mtd: onenand: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users. Modify the onenand drivers to switch to this
approach.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/onenand/onenand_base.c | 162 ++++++++++++++++++++++---------------
 include/linux/mtd/onenand.h        |   2 -
 2 files changed, 97 insertions(+), 67 deletions(-)

diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
index d0fa505..a4b029a 100644
--- a/drivers/mtd/onenand/onenand_base.c
+++ b/drivers/mtd/onenand/onenand_base.c
@@ -68,21 +68,33 @@ MODULE_PARM_DESC(otp,	"Corresponding behaviour of OneNAND in OTP"
  * flexonenand_oob_128 - oob info for Flex-Onenand with 4KB page
  * For now, we expose only 64 out of 80 ecc bytes
  */
-static struct nand_ecclayout flexonenand_oob_128 = {
-	.eccbytes	= 64,
-	.eccpos		= {
-		6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
-		22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
-		38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
-		54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
-		70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
-		86, 87, 88, 89, 90, 91, 92, 93, 94, 95,
-		102, 103, 104, 105
-		},
-	.oobfree	= {
-		{2, 4}, {18, 4}, {34, 4}, {50, 4},
-		{66, 4}, {82, 4}, {98, 4}, {114, 4}
-	}
+static int flexonenand_ooblayout_ecc(struct mtd_info *mtd, int section,
+				     struct mtd_oob_region *oobregion)
+{
+	if (section > 7)
+		return -ERANGE;
+
+	oobregion->offset = (section * 16) + 6;
+	oobregion->length = 10;
+
+	return 0;
+}
+
+static int flexonenand_ooblayout_free(struct mtd_info *mtd, int section,
+				      struct mtd_oob_region *oobregion)
+{
+	if (section > 7)
+		return -ERANGE;
+
+	oobregion->offset = (section * 16) + 2;
+	oobregion->length = 4;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops flexonenand_ooblayout_ops = {
+	.ecc = flexonenand_ooblayout_ecc,
+	.free = flexonenand_ooblayout_free,
 };
 
 /*
@@ -91,56 +103,77 @@ static struct nand_ecclayout flexonenand_oob_128 = {
  * Based on specification:
  * 4Gb M-die OneNAND Flash (KFM4G16Q4M, KFN8G16Q4M). Rev. 1.3, Apr. 2010
  *
- * For eccpos we expose only 64 bytes out of 72 (see struct nand_ecclayout)
- *
- * oobfree uses the spare area fields marked as
- * "Managed by internal ECC logic for Logical Sector Number area"
- */
-static struct nand_ecclayout onenand_oob_128 = {
-	.eccbytes	= 64,
-	.eccpos		= {
-		7, 8, 9, 10, 11, 12, 13, 14, 15,
-		23, 24, 25, 26, 27, 28, 29, 30, 31,
-		39, 40, 41, 42, 43, 44, 45, 46, 47,
-		55, 56, 57, 58, 59, 60, 61, 62, 63,
-		71, 72, 73, 74, 75, 76, 77, 78, 79,
-		87, 88, 89, 90, 91, 92, 93, 94, 95,
-		103, 104, 105, 106, 107, 108, 109, 110, 111,
-		119
-	},
-	.oobfree	= {
-		{2, 3}, {18, 3}, {34, 3}, {50, 3},
-		{66, 3}, {82, 3}, {98, 3}, {114, 3}
-	}
+ */
+static int onenand_ooblayout_128_ecc(struct mtd_info *mtd, int section,
+				     struct mtd_oob_region *oobregion)
+{
+	if (section > 7)
+		return -ERANGE;
+
+	oobregion->offset = (section * 16) + 7;
+	oobregion->length = 9;
+
+	return 0;
+}
+
+static int onenand_ooblayout_128_free(struct mtd_info *mtd, int section,
+				      struct mtd_oob_region *oobregion)
+{
+	if (section >= 8)
+		return -ERANGE;
+
+	/*
+	 * free bytes are using the spare area fields marked as
+	 * "Managed by internal ECC logic for Logical Sector Number area"
+	 */
+	oobregion->offset = (section * 16) + 2;
+	oobregion->length = 3;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops onenand_oob_128_ooblayout_ops = {
+	.ecc = onenand_ooblayout_128_ecc,
+	.free = onenand_ooblayout_128_free,
 };
 
 /**
- * onenand_oob_64 - oob info for large (2KB) page
+ * onenand_oob_32_64 - oob info for large (2KB) page
  */
-static struct nand_ecclayout onenand_oob_64 = {
-	.eccbytes	= 20,
-	.eccpos		= {
-		8, 9, 10, 11, 12,
-		24, 25, 26, 27, 28,
-		40, 41, 42, 43, 44,
-		56, 57, 58, 59, 60,
-		},
-	.oobfree	= {
-		{2, 3}, {14, 2}, {18, 3}, {30, 2},
-		{34, 3}, {46, 2}, {50, 3}, {62, 2}
+static int onenand_ooblayout_32_64_ecc(struct mtd_info *mtd, int section,
+				       struct mtd_oob_region *oobregion)
+{
+	if (section > 3)
+		return -ERANGE;
+
+	oobregion->offset = (section * 16) + 8;
+	oobregion->length = 5;
+
+	return 0;
+}
+
+static int onenand_ooblayout_32_64_free(struct mtd_info *mtd, int section,
+					struct mtd_oob_region *oobregion)
+{
+	int sections = (mtd->oobsize / 32) * 2;
+
+	if (section >= sections)
+		return -ERANGE;
+
+	if (section & 1) {
+		oobregion->offset = ((section - 1) * 16) + 14;
+		oobregion->length = 2;
+	} else  {
+		oobregion->offset = (section * 16) + 2;
+		oobregion->length = 3;
 	}
-};
 
-/**
- * onenand_oob_32 - oob info for middle (1KB) page
- */
-static struct nand_ecclayout onenand_oob_32 = {
-	.eccbytes	= 10,
-	.eccpos		= {
-		8, 9, 10, 11, 12,
-		24, 25, 26, 27, 28,
-		},
-	.oobfree	= { {2, 3}, {14, 2}, {18, 3}, {30, 2} }
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops onenand_oob_32_64_ooblayout_ops = {
+	.ecc = onenand_ooblayout_32_64_ecc,
+	.free = onenand_ooblayout_32_64_free,
 };
 
 static const unsigned char ffchars[] = {
@@ -3957,22 +3990,22 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
 	switch (mtd->oobsize) {
 	case 128:
 		if (FLEXONENAND(this)) {
-			this->ecclayout = &flexonenand_oob_128;
+			mtd_set_ooblayout(mtd, &flexonenand_ooblayout_ops);
 			mtd->subpage_sft = 0;
 		} else {
-			this->ecclayout = &onenand_oob_128;
+			mtd_set_ooblayout(mtd, &onenand_oob_128_ooblayout_ops);
 			mtd->subpage_sft = 2;
 		}
 		if (ONENAND_IS_NOP_1(this))
 			mtd->subpage_sft = 0;
 		break;
 	case 64:
-		this->ecclayout = &onenand_oob_64;
+		mtd_set_ooblayout(mtd, &onenand_oob_32_64_ooblayout_ops);
 		mtd->subpage_sft = 2;
 		break;
 
 	case 32:
-		this->ecclayout = &onenand_oob_32;
+		mtd_set_ooblayout(mtd, &onenand_oob_32_64_ooblayout_ops);
 		mtd->subpage_sft = 1;
 		break;
 
@@ -3981,7 +4014,7 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
 			__func__, mtd->oobsize);
 		mtd->subpage_sft = 0;
 		/* To prevent kernel oops */
-		this->ecclayout = &onenand_oob_32;
+		mtd_set_ooblayout(mtd, &onenand_oob_32_64_ooblayout_ops);
 		break;
 	}
 
@@ -3997,7 +4030,6 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
 
 	mtd->oobavail = ret;
 
-	mtd_set_ecclayout(mtd, this->ecclayout);
 	mtd->ecc_strength = 1;
 
 	/* Fill in remaining MTD driver data */
diff --git a/include/linux/mtd/onenand.h b/include/linux/mtd/onenand.h
index 4596503..0aaa98b 100644
--- a/include/linux/mtd/onenand.h
+++ b/include/linux/mtd/onenand.h
@@ -80,7 +80,6 @@ struct onenand_bufferram {
  * @page_buf:		[INTERN] page main data buffer
  * @oob_buf:		[INTERN] page oob data buffer
  * @subpagesize:	[INTERN] holds the subpagesize
- * @ecclayout:		[REPLACEABLE] the default ecc placement scheme
  * @bbm:		[REPLACEABLE] pointer to Bad Block Management
  * @priv:		[OPTIONAL] pointer to private chip date
  */
@@ -134,7 +133,6 @@ struct onenand_chip {
 #endif
 
 	int			subpagesize;
-	struct nand_ecclayout	*ecclayout;
 
 	void			*bbm;
 
-- 
2.5.0

[PATCH v5 47/50] mtd: onenand: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users. Modify the onenand drivers to switch to this
approach.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/mtd/onenand/onenand_base.c | 162 ++++++++++++++++++++++---------------
 include/linux/mtd/onenand.h        |   2 -
 2 files changed, 97 insertions(+), 67 deletions(-)

diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
index d0fa505..a4b029a 100644
--- a/drivers/mtd/onenand/onenand_base.c
+++ b/drivers/mtd/onenand/onenand_base.c
@@ -68,21 +68,33 @@ MODULE_PARM_DESC(otp,	"Corresponding behaviour of OneNAND in OTP"
  * flexonenand_oob_128 - oob info for Flex-Onenand with 4KB page
  * For now, we expose only 64 out of 80 ecc bytes
  */
-static struct nand_ecclayout flexonenand_oob_128 = {
-	.eccbytes	= 64,
-	.eccpos		= {
-		6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
-		22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
-		38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
-		54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
-		70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
-		86, 87, 88, 89, 90, 91, 92, 93, 94, 95,
-		102, 103, 104, 105
-		},
-	.oobfree	= {
-		{2, 4}, {18, 4}, {34, 4}, {50, 4},
-		{66, 4}, {82, 4}, {98, 4}, {114, 4}
-	}
+static int flexonenand_ooblayout_ecc(struct mtd_info *mtd, int section,
+				     struct mtd_oob_region *oobregion)
+{
+	if (section > 7)
+		return -ERANGE;
+
+	oobregion->offset = (section * 16) + 6;
+	oobregion->length = 10;
+
+	return 0;
+}
+
+static int flexonenand_ooblayout_free(struct mtd_info *mtd, int section,
+				      struct mtd_oob_region *oobregion)
+{
+	if (section > 7)
+		return -ERANGE;
+
+	oobregion->offset = (section * 16) + 2;
+	oobregion->length = 4;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops flexonenand_ooblayout_ops = {
+	.ecc = flexonenand_ooblayout_ecc,
+	.free = flexonenand_ooblayout_free,
 };
 
 /*
@@ -91,56 +103,77 @@ static struct nand_ecclayout flexonenand_oob_128 = {
  * Based on specification:
  * 4Gb M-die OneNAND Flash (KFM4G16Q4M, KFN8G16Q4M). Rev. 1.3, Apr. 2010
  *
- * For eccpos we expose only 64 bytes out of 72 (see struct nand_ecclayout)
- *
- * oobfree uses the spare area fields marked as
- * "Managed by internal ECC logic for Logical Sector Number area"
- */
-static struct nand_ecclayout onenand_oob_128 = {
-	.eccbytes	= 64,
-	.eccpos		= {
-		7, 8, 9, 10, 11, 12, 13, 14, 15,
-		23, 24, 25, 26, 27, 28, 29, 30, 31,
-		39, 40, 41, 42, 43, 44, 45, 46, 47,
-		55, 56, 57, 58, 59, 60, 61, 62, 63,
-		71, 72, 73, 74, 75, 76, 77, 78, 79,
-		87, 88, 89, 90, 91, 92, 93, 94, 95,
-		103, 104, 105, 106, 107, 108, 109, 110, 111,
-		119
-	},
-	.oobfree	= {
-		{2, 3}, {18, 3}, {34, 3}, {50, 3},
-		{66, 3}, {82, 3}, {98, 3}, {114, 3}
-	}
+ */
+static int onenand_ooblayout_128_ecc(struct mtd_info *mtd, int section,
+				     struct mtd_oob_region *oobregion)
+{
+	if (section > 7)
+		return -ERANGE;
+
+	oobregion->offset = (section * 16) + 7;
+	oobregion->length = 9;
+
+	return 0;
+}
+
+static int onenand_ooblayout_128_free(struct mtd_info *mtd, int section,
+				      struct mtd_oob_region *oobregion)
+{
+	if (section >= 8)
+		return -ERANGE;
+
+	/*
+	 * free bytes are using the spare area fields marked as
+	 * "Managed by internal ECC logic for Logical Sector Number area"
+	 */
+	oobregion->offset = (section * 16) + 2;
+	oobregion->length = 3;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops onenand_oob_128_ooblayout_ops = {
+	.ecc = onenand_ooblayout_128_ecc,
+	.free = onenand_ooblayout_128_free,
 };
 
 /**
- * onenand_oob_64 - oob info for large (2KB) page
+ * onenand_oob_32_64 - oob info for large (2KB) page
  */
-static struct nand_ecclayout onenand_oob_64 = {
-	.eccbytes	= 20,
-	.eccpos		= {
-		8, 9, 10, 11, 12,
-		24, 25, 26, 27, 28,
-		40, 41, 42, 43, 44,
-		56, 57, 58, 59, 60,
-		},
-	.oobfree	= {
-		{2, 3}, {14, 2}, {18, 3}, {30, 2},
-		{34, 3}, {46, 2}, {50, 3}, {62, 2}
+static int onenand_ooblayout_32_64_ecc(struct mtd_info *mtd, int section,
+				       struct mtd_oob_region *oobregion)
+{
+	if (section > 3)
+		return -ERANGE;
+
+	oobregion->offset = (section * 16) + 8;
+	oobregion->length = 5;
+
+	return 0;
+}
+
+static int onenand_ooblayout_32_64_free(struct mtd_info *mtd, int section,
+					struct mtd_oob_region *oobregion)
+{
+	int sections = (mtd->oobsize / 32) * 2;
+
+	if (section >= sections)
+		return -ERANGE;
+
+	if (section & 1) {
+		oobregion->offset = ((section - 1) * 16) + 14;
+		oobregion->length = 2;
+	} else  {
+		oobregion->offset = (section * 16) + 2;
+		oobregion->length = 3;
 	}
-};
 
-/**
- * onenand_oob_32 - oob info for middle (1KB) page
- */
-static struct nand_ecclayout onenand_oob_32 = {
-	.eccbytes	= 10,
-	.eccpos		= {
-		8, 9, 10, 11, 12,
-		24, 25, 26, 27, 28,
-		},
-	.oobfree	= { {2, 3}, {14, 2}, {18, 3}, {30, 2} }
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops onenand_oob_32_64_ooblayout_ops = {
+	.ecc = onenand_ooblayout_32_64_ecc,
+	.free = onenand_ooblayout_32_64_free,
 };
 
 static const unsigned char ffchars[] = {
@@ -3957,22 +3990,22 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
 	switch (mtd->oobsize) {
 	case 128:
 		if (FLEXONENAND(this)) {
-			this->ecclayout = &flexonenand_oob_128;
+			mtd_set_ooblayout(mtd, &flexonenand_ooblayout_ops);
 			mtd->subpage_sft = 0;
 		} else {
-			this->ecclayout = &onenand_oob_128;
+			mtd_set_ooblayout(mtd, &onenand_oob_128_ooblayout_ops);
 			mtd->subpage_sft = 2;
 		}
 		if (ONENAND_IS_NOP_1(this))
 			mtd->subpage_sft = 0;
 		break;
 	case 64:
-		this->ecclayout = &onenand_oob_64;
+		mtd_set_ooblayout(mtd, &onenand_oob_32_64_ooblayout_ops);
 		mtd->subpage_sft = 2;
 		break;
 
 	case 32:
-		this->ecclayout = &onenand_oob_32;
+		mtd_set_ooblayout(mtd, &onenand_oob_32_64_ooblayout_ops);
 		mtd->subpage_sft = 1;
 		break;
 
@@ -3981,7 +4014,7 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
 			__func__, mtd->oobsize);
 		mtd->subpage_sft = 0;
 		/* To prevent kernel oops */
-		this->ecclayout = &onenand_oob_32;
+		mtd_set_ooblayout(mtd, &onenand_oob_32_64_ooblayout_ops);
 		break;
 	}
 
@@ -3997,7 +4030,6 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
 
 	mtd->oobavail = ret;
 
-	mtd_set_ecclayout(mtd, this->ecclayout);
 	mtd->ecc_strength = 1;
 
 	/* Fill in remaining MTD driver data */
diff --git a/include/linux/mtd/onenand.h b/include/linux/mtd/onenand.h
index 4596503..0aaa98b 100644
--- a/include/linux/mtd/onenand.h
+++ b/include/linux/mtd/onenand.h
@@ -80,7 +80,6 @@ struct onenand_bufferram {
  * @page_buf:		[INTERN] page main data buffer
  * @oob_buf:		[INTERN] page oob data buffer
  * @subpagesize:	[INTERN] holds the subpagesize
- * @ecclayout:		[REPLACEABLE] the default ecc placement scheme
  * @bbm:		[REPLACEABLE] pointer to Bad Block Management
  * @priv:		[OPTIONAL] pointer to private chip date
  */
@@ -134,7 +133,6 @@ struct onenand_chip {
 #endif
 
 	int			subpagesize;
-	struct nand_ecclayout	*ecclayout;
 
 	void			*bbm;
 
-- 
2.5.0

[PATCH v5 47/50] mtd: onenand: switch to mtd_ooblayout_ops

[Boris Brezillon]

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users. Modify the onenand drivers to switch to this
approach.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/onenand/onenand_base.c | 162 ++++++++++++++++++++++---------------
 include/linux/mtd/onenand.h        |   2 -
 2 files changed, 97 insertions(+), 67 deletions(-)

diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
index d0fa505..a4b029a 100644
--- a/drivers/mtd/onenand/onenand_base.c
+++ b/drivers/mtd/onenand/onenand_base.c
@@ -68,21 +68,33 @@ MODULE_PARM_DESC(otp,	"Corresponding behaviour of OneNAND in OTP"
  * flexonenand_oob_128 - oob info for Flex-Onenand with 4KB page
  * For now, we expose only 64 out of 80 ecc bytes
  */
-static struct nand_ecclayout flexonenand_oob_128 = {
-	.eccbytes	= 64,
-	.eccpos		= {
-		6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
-		22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
-		38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
-		54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
-		70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
-		86, 87, 88, 89, 90, 91, 92, 93, 94, 95,
-		102, 103, 104, 105
-		},
-	.oobfree	= {
-		{2, 4}, {18, 4}, {34, 4}, {50, 4},
-		{66, 4}, {82, 4}, {98, 4}, {114, 4}
-	}
+static int flexonenand_ooblayout_ecc(struct mtd_info *mtd, int section,
+				     struct mtd_oob_region *oobregion)
+{
+	if (section > 7)
+		return -ERANGE;
+
+	oobregion->offset = (section * 16) + 6;
+	oobregion->length = 10;
+
+	return 0;
+}
+
+static int flexonenand_ooblayout_free(struct mtd_info *mtd, int section,
+				      struct mtd_oob_region *oobregion)
+{
+	if (section > 7)
+		return -ERANGE;
+
+	oobregion->offset = (section * 16) + 2;
+	oobregion->length = 4;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops flexonenand_ooblayout_ops = {
+	.ecc = flexonenand_ooblayout_ecc,
+	.free = flexonenand_ooblayout_free,
 };
 
 /*
@@ -91,56 +103,77 @@ static struct nand_ecclayout flexonenand_oob_128 = {
  * Based on specification:
  * 4Gb M-die OneNAND Flash (KFM4G16Q4M, KFN8G16Q4M). Rev. 1.3, Apr. 2010
  *
- * For eccpos we expose only 64 bytes out of 72 (see struct nand_ecclayout)
- *
- * oobfree uses the spare area fields marked as
- * "Managed by internal ECC logic for Logical Sector Number area"
- */
-static struct nand_ecclayout onenand_oob_128 = {
-	.eccbytes	= 64,
-	.eccpos		= {
-		7, 8, 9, 10, 11, 12, 13, 14, 15,
-		23, 24, 25, 26, 27, 28, 29, 30, 31,
-		39, 40, 41, 42, 43, 44, 45, 46, 47,
-		55, 56, 57, 58, 59, 60, 61, 62, 63,
-		71, 72, 73, 74, 75, 76, 77, 78, 79,
-		87, 88, 89, 90, 91, 92, 93, 94, 95,
-		103, 104, 105, 106, 107, 108, 109, 110, 111,
-		119
-	},
-	.oobfree	= {
-		{2, 3}, {18, 3}, {34, 3}, {50, 3},
-		{66, 3}, {82, 3}, {98, 3}, {114, 3}
-	}
+ */
+static int onenand_ooblayout_128_ecc(struct mtd_info *mtd, int section,
+				     struct mtd_oob_region *oobregion)
+{
+	if (section > 7)
+		return -ERANGE;
+
+	oobregion->offset = (section * 16) + 7;
+	oobregion->length = 9;
+
+	return 0;
+}
+
+static int onenand_ooblayout_128_free(struct mtd_info *mtd, int section,
+				      struct mtd_oob_region *oobregion)
+{
+	if (section >= 8)
+		return -ERANGE;
+
+	/*
+	 * free bytes are using the spare area fields marked as
+	 * "Managed by internal ECC logic for Logical Sector Number area"
+	 */
+	oobregion->offset = (section * 16) + 2;
+	oobregion->length = 3;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops onenand_oob_128_ooblayout_ops = {
+	.ecc = onenand_ooblayout_128_ecc,
+	.free = onenand_ooblayout_128_free,
 };
 
 /**
- * onenand_oob_64 - oob info for large (2KB) page
+ * onenand_oob_32_64 - oob info for large (2KB) page
  */
-static struct nand_ecclayout onenand_oob_64 = {
-	.eccbytes	= 20,
-	.eccpos		= {
-		8, 9, 10, 11, 12,
-		24, 25, 26, 27, 28,
-		40, 41, 42, 43, 44,
-		56, 57, 58, 59, 60,
-		},
-	.oobfree	= {
-		{2, 3}, {14, 2}, {18, 3}, {30, 2},
-		{34, 3}, {46, 2}, {50, 3}, {62, 2}
+static int onenand_ooblayout_32_64_ecc(struct mtd_info *mtd, int section,
+				       struct mtd_oob_region *oobregion)
+{
+	if (section > 3)
+		return -ERANGE;
+
+	oobregion->offset = (section * 16) + 8;
+	oobregion->length = 5;
+
+	return 0;
+}
+
+static int onenand_ooblayout_32_64_free(struct mtd_info *mtd, int section,
+					struct mtd_oob_region *oobregion)
+{
+	int sections = (mtd->oobsize / 32) * 2;
+
+	if (section >= sections)
+		return -ERANGE;
+
+	if (section & 1) {
+		oobregion->offset = ((section - 1) * 16) + 14;
+		oobregion->length = 2;
+	} else  {
+		oobregion->offset = (section * 16) + 2;
+		oobregion->length = 3;
 	}
-};
 
-/**
- * onenand_oob_32 - oob info for middle (1KB) page
- */
-static struct nand_ecclayout onenand_oob_32 = {
-	.eccbytes	= 10,
-	.eccpos		= {
-		8, 9, 10, 11, 12,
-		24, 25, 26, 27, 28,
-		},
-	.oobfree	= { {2, 3}, {14, 2}, {18, 3}, {30, 2} }
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops onenand_oob_32_64_ooblayout_ops = {
+	.ecc = onenand_ooblayout_32_64_ecc,
+	.free = onenand_ooblayout_32_64_free,
 };
 
 static const unsigned char ffchars[] = {
@@ -3957,22 +3990,22 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
 	switch (mtd->oobsize) {
 	case 128:
 		if (FLEXONENAND(this)) {
-			this->ecclayout = &flexonenand_oob_128;
+			mtd_set_ooblayout(mtd, &flexonenand_ooblayout_ops);
 			mtd->subpage_sft = 0;
 		} else {
-			this->ecclayout = &onenand_oob_128;
+			mtd_set_ooblayout(mtd, &onenand_oob_128_ooblayout_ops);
 			mtd->subpage_sft = 2;
 		}
 		if (ONENAND_IS_NOP_1(this))
 			mtd->subpage_sft = 0;
 		break;
 	case 64:
-		this->ecclayout = &onenand_oob_64;
+		mtd_set_ooblayout(mtd, &onenand_oob_32_64_ooblayout_ops);
 		mtd->subpage_sft = 2;
 		break;
 
 	case 32:
-		this->ecclayout = &onenand_oob_32;
+		mtd_set_ooblayout(mtd, &onenand_oob_32_64_ooblayout_ops);
 		mtd->subpage_sft = 1;
 		break;
 
@@ -3981,7 +4014,7 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
 			__func__, mtd->oobsize);
 		mtd->subpage_sft = 0;
 		/* To prevent kernel oops */
-		this->ecclayout = &onenand_oob_32;
+		mtd_set_ooblayout(mtd, &onenand_oob_32_64_ooblayout_ops);
 		break;
 	}
 
@@ -3997,7 +4030,6 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
 
 	mtd->oobavail = ret;
 
-	mtd_set_ecclayout(mtd, this->ecclayout);
 	mtd->ecc_strength = 1;
 
 	/* Fill in remaining MTD driver data */
diff --git a/include/linux/mtd/onenand.h b/include/linux/mtd/onenand.h
index 4596503..0aaa98b 100644
--- a/include/linux/mtd/onenand.h
+++ b/include/linux/mtd/onenand.h
@@ -80,7 +80,6 @@ struct onenand_bufferram {
  * @page_buf:		[INTERN] page main data buffer
  * @oob_buf:		[INTERN] page oob data buffer
  * @subpagesize:	[INTERN] holds the subpagesize
- * @ecclayout:		[REPLACEABLE] the default ecc placement scheme
  * @bbm:		[REPLACEABLE] pointer to Bad Block Management
  * @priv:		[OPTIONAL] pointer to private chip date
  */
@@ -134,7 +133,6 @@ struct onenand_chip {
 #endif
 
 	int			subpagesize;
-	struct nand_ecclayout	*ecclayout;
 
 	void			*bbm;
 
-- 
2.5.0

[PATCH v5 48/50] staging: mt29f_spinand: switch to mtd_ooblayout_ops

[Boris Brezillon]

Replace the nand_ecclayout definition by the equivalent mtd_ooblayout_ops
definition.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/staging/mt29f_spinand/mt29f_spinand.c | 48 +++++++++++++++++----------
 1 file changed, 30 insertions(+), 18 deletions(-)

diff --git a/drivers/staging/mt29f_spinand/mt29f_spinand.c b/drivers/staging/mt29f_spinand/mt29f_spinand.c
index 163f21a..f503699 100644
--- a/drivers/staging/mt29f_spinand/mt29f_spinand.c
+++ b/drivers/staging/mt29f_spinand/mt29f_spinand.c
@@ -42,23 +42,33 @@ static inline struct spinand_state *mtd_to_state(struct mtd_info *mtd)
 static int enable_hw_ecc;
 static int enable_read_hw_ecc;
 
-static struct nand_ecclayout spinand_oob_64 = {
-	.eccbytes = 24,
-	.eccpos = {
-		1, 2, 3, 4, 5, 6,
-		17, 18, 19, 20, 21, 22,
-		33, 34, 35, 36, 37, 38,
-		49, 50, 51, 52, 53, 54, },
-	.oobfree = {
-		{.offset = 8,
-			.length = 8},
-		{.offset = 24,
-			.length = 8},
-		{.offset = 40,
-			.length = 8},
-		{.offset = 56,
-			.length = 8},
-	}
+static int spinand_ooblayout_64_ecc(struct mtd_info *mtd, int section,
+				    struct mtd_oob_region *oobregion)
+{
+	if (section > 3)
+		return -ERANGE;
+
+	oobregion->offset = (section * 16) + 1;
+	oobregion->length = 6;
+
+	return 0;
+}
+
+static int spinand_ooblayout_64_free(struct mtd_info *mtd, int section,
+				     struct mtd_oob_region *oobregion)
+{
+	if (section > 3)
+		return -ERANGE;
+
+	oobregion->offset = (section * 16) + 8;
+	oobregion->length = 8;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops spinand_oob_64_ops = {
+	.ecc = spinand_ooblayout_64_ecc,
+	.free = spinand_ooblayout_64_free,
 };
 #endif
 
@@ -886,7 +896,6 @@ static int spinand_probe(struct spi_device *spi_nand)
 
 	chip->ecc.strength = 1;
 	chip->ecc.total	= chip->ecc.steps * chip->ecc.bytes;
-	chip->ecc.layout = &spinand_oob_64;
 	chip->ecc.read_page = spinand_read_page_hwecc;
 	chip->ecc.write_page = spinand_write_page_hwecc;
 #else
@@ -912,6 +921,9 @@ static int spinand_probe(struct spi_device *spi_nand)
 
 	mtd->dev.parent = &spi_nand->dev;
 	mtd->oobsize = 64;
+#ifdef CONFIG_MTD_SPINAND_ONDIEECC
+	mtd_set_ooblayout(mtd, &spinand_oob_64_ops);
+#endif
 
 	if (nand_scan(mtd, 1))
 		return -ENXIO;
-- 
2.5.0

[PATCH v5 48/50] staging: mt29f_spinand: switch to mtd_ooblayout_ops

[Boris Brezillon]

Replace the nand_ecclayout definition by the equivalent mtd_ooblayout_ops
definition.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/staging/mt29f_spinand/mt29f_spinand.c | 48 +++++++++++++++++----------
 1 file changed, 30 insertions(+), 18 deletions(-)

diff --git a/drivers/staging/mt29f_spinand/mt29f_spinand.c b/drivers/staging/mt29f_spinand/mt29f_spinand.c
index 163f21a..f503699 100644
--- a/drivers/staging/mt29f_spinand/mt29f_spinand.c
+++ b/drivers/staging/mt29f_spinand/mt29f_spinand.c
@@ -42,23 +42,33 @@ static inline struct spinand_state *mtd_to_state(struct mtd_info *mtd)
 static int enable_hw_ecc;
 static int enable_read_hw_ecc;
 
-static struct nand_ecclayout spinand_oob_64 = {
-	.eccbytes = 24,
-	.eccpos = {
-		1, 2, 3, 4, 5, 6,
-		17, 18, 19, 20, 21, 22,
-		33, 34, 35, 36, 37, 38,
-		49, 50, 51, 52, 53, 54, },
-	.oobfree = {
-		{.offset = 8,
-			.length = 8},
-		{.offset = 24,
-			.length = 8},
-		{.offset = 40,
-			.length = 8},
-		{.offset = 56,
-			.length = 8},
-	}
+static int spinand_ooblayout_64_ecc(struct mtd_info *mtd, int section,
+				    struct mtd_oob_region *oobregion)
+{
+	if (section > 3)
+		return -ERANGE;
+
+	oobregion->offset = (section * 16) + 1;
+	oobregion->length = 6;
+
+	return 0;
+}
+
+static int spinand_ooblayout_64_free(struct mtd_info *mtd, int section,
+				     struct mtd_oob_region *oobregion)
+{
+	if (section > 3)
+		return -ERANGE;
+
+	oobregion->offset = (section * 16) + 8;
+	oobregion->length = 8;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops spinand_oob_64_ops = {
+	.ecc = spinand_ooblayout_64_ecc,
+	.free = spinand_ooblayout_64_free,
 };
 #endif
 
@@ -886,7 +896,6 @@ static int spinand_probe(struct spi_device *spi_nand)
 
 	chip->ecc.strength = 1;
 	chip->ecc.total	= chip->ecc.steps * chip->ecc.bytes;
-	chip->ecc.layout = &spinand_oob_64;
 	chip->ecc.read_page = spinand_read_page_hwecc;
 	chip->ecc.write_page = spinand_write_page_hwecc;
 #else
@@ -912,6 +921,9 @@ static int spinand_probe(struct spi_device *spi_nand)
 
 	mtd->dev.parent = &spi_nand->dev;
 	mtd->oobsize = 64;
+#ifdef CONFIG_MTD_SPINAND_ONDIEECC
+	mtd_set_ooblayout(mtd, &spinand_oob_64_ops);
+#endif
 
 	if (nand_scan(mtd, 1))
 		return -ENXIO;
-- 
2.5.0

[PATCH v5 48/50] staging: mt29f_spinand: switch to mtd_ooblayout_ops

[Boris Brezillon]

Replace the nand_ecclayout definition by the equivalent mtd_ooblayout_ops
definition.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/staging/mt29f_spinand/mt29f_spinand.c | 48 +++++++++++++++++----------
 1 file changed, 30 insertions(+), 18 deletions(-)

diff --git a/drivers/staging/mt29f_spinand/mt29f_spinand.c b/drivers/staging/mt29f_spinand/mt29f_spinand.c
index 163f21a..f503699 100644
--- a/drivers/staging/mt29f_spinand/mt29f_spinand.c
+++ b/drivers/staging/mt29f_spinand/mt29f_spinand.c
@@ -42,23 +42,33 @@ static inline struct spinand_state *mtd_to_state(struct mtd_info *mtd)
 static int enable_hw_ecc;
 static int enable_read_hw_ecc;
 
-static struct nand_ecclayout spinand_oob_64 = {
-	.eccbytes = 24,
-	.eccpos = {
-		1, 2, 3, 4, 5, 6,
-		17, 18, 19, 20, 21, 22,
-		33, 34, 35, 36, 37, 38,
-		49, 50, 51, 52, 53, 54, },
-	.oobfree = {
-		{.offset = 8,
-			.length = 8},
-		{.offset = 24,
-			.length = 8},
-		{.offset = 40,
-			.length = 8},
-		{.offset = 56,
-			.length = 8},
-	}
+static int spinand_ooblayout_64_ecc(struct mtd_info *mtd, int section,
+				    struct mtd_oob_region *oobregion)
+{
+	if (section > 3)
+		return -ERANGE;
+
+	oobregion->offset = (section * 16) + 1;
+	oobregion->length = 6;
+
+	return 0;
+}
+
+static int spinand_ooblayout_64_free(struct mtd_info *mtd, int section,
+				     struct mtd_oob_region *oobregion)
+{
+	if (section > 3)
+		return -ERANGE;
+
+	oobregion->offset = (section * 16) + 8;
+	oobregion->length = 8;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops spinand_oob_64_ops = {
+	.ecc = spinand_ooblayout_64_ecc,
+	.free = spinand_ooblayout_64_free,
 };
 #endif
 
@@ -886,7 +896,6 @@ static int spinand_probe(struct spi_device *spi_nand)
 
 	chip->ecc.strength = 1;
 	chip->ecc.total	= chip->ecc.steps * chip->ecc.bytes;
-	chip->ecc.layout = &spinand_oob_64;
 	chip->ecc.read_page = spinand_read_page_hwecc;
 	chip->ecc.write_page = spinand_write_page_hwecc;
 #else
@@ -912,6 +921,9 @@ static int spinand_probe(struct spi_device *spi_nand)
 
 	mtd->dev.parent = &spi_nand->dev;
 	mtd->oobsize = 64;
+#ifdef CONFIG_MTD_SPINAND_ONDIEECC
+	mtd_set_ooblayout(mtd, &spinand_oob_64_ops);
+#endif
 
 	if (nand_scan(mtd, 1))
 		return -ENXIO;
-- 
2.5.0

[PATCH v5 49/50] mtd: nand: kill the ecc->layout field

[Boris Brezillon]

Now that all NAND drivers have switch to mtd_ooblayout_ops, we can kill
the ecc->layout field.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/nand_base.c | 7 -------
 drivers/mtd/nand/nand_bch.c  | 9 ---------
 include/linux/mtd/nand.h     | 2 --
 3 files changed, 18 deletions(-)

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 3d6985e..cf0c3180 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -4162,13 +4162,6 @@ int nand_scan_tail(struct mtd_info *mtd)
 	chip->oob_poi = chip->buffers->databuf + mtd->writesize;
 
 	/*
-	 * Set the provided ECC layout. If ecc->layout is NULL, the MTD core
-	 * will just leave mtd->ooblayout to NULL, if it's not NULL, it will
-	 * set ->ooblayout to the default ecclayout wrapper.
-	 */
-	mtd_set_ecclayout(mtd, ecc->layout);
-
-	/*
 	 * If no default placement scheme is given, select an appropriate one.
 	 */
 	if (!mtd->ooblayout && (ecc->mode != NAND_ECC_SOFT_BCH)) {
diff --git a/drivers/mtd/nand/nand_bch.c b/drivers/mtd/nand/nand_bch.c
index e29e75f..ca9b2a4 100644
--- a/drivers/mtd/nand/nand_bch.c
+++ b/drivers/mtd/nand/nand_bch.c
@@ -158,15 +158,6 @@ struct nand_bch_control *nand_bch_init(struct mtd_info *mtd)
 
 	eccsteps = mtd->writesize/eccsize;
 
-	/*
-	 * Rely on the default ecclayout to ooblayout wrapper provided by MTD
-	 * core if ecc.layout is not NULL.
-	 * FIXME: this should be removed when all callers have moved to the
-	 * mtd_ooblayout_ops approach.
-	 */
-	if (nand->ecc.layout)
-		mtd_set_ecclayout(mtd, nand->ecc.layout);
-
 	/* if no ecc placement scheme was provided, build one */
 	if (!mtd->ooblayout) {
 
diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index a9796ba..d766c12 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -473,7 +473,6 @@ struct nand_hw_control {
  * @prepad:	padding information for syndrome based ECC generators
  * @postpad:	padding information for syndrome based ECC generators
  * @options:	ECC specific options (see NAND_ECC_XXX flags defined above)
- * @layout:	ECC layout control struct pointer
  * @priv:	pointer to private ECC control data
  * @hwctl:	function to control hardware ECC generator. Must only
  *		be provided if an hardware ECC is available
@@ -524,7 +523,6 @@ struct nand_ecc_ctrl {
 	int prepad;
 	int postpad;
 	unsigned int options;
-	struct nand_ecclayout	*layout;
 	void *priv;
 	void (*hwctl)(struct mtd_info *mtd, int mode);
 	int (*calculate)(struct mtd_info *mtd, const uint8_t *dat,
-- 
2.5.0

[PATCH v5 49/50] mtd: nand: kill the ecc->layout field

[Boris Brezillon]

Now that all NAND drivers have switch to mtd_ooblayout_ops, we can kill
the ecc->layout field.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/mtd/nand/nand_base.c | 7 -------
 drivers/mtd/nand/nand_bch.c  | 9 ---------
 include/linux/mtd/nand.h     | 2 --
 3 files changed, 18 deletions(-)

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 3d6985e..cf0c3180 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -4162,13 +4162,6 @@ int nand_scan_tail(struct mtd_info *mtd)
 	chip->oob_poi = chip->buffers->databuf + mtd->writesize;
 
 	/*
-	 * Set the provided ECC layout. If ecc->layout is NULL, the MTD core
-	 * will just leave mtd->ooblayout to NULL, if it's not NULL, it will
-	 * set ->ooblayout to the default ecclayout wrapper.
-	 */
-	mtd_set_ecclayout(mtd, ecc->layout);
-
-	/*
 	 * If no default placement scheme is given, select an appropriate one.
 	 */
 	if (!mtd->ooblayout && (ecc->mode != NAND_ECC_SOFT_BCH)) {
diff --git a/drivers/mtd/nand/nand_bch.c b/drivers/mtd/nand/nand_bch.c
index e29e75f..ca9b2a4 100644
--- a/drivers/mtd/nand/nand_bch.c
+++ b/drivers/mtd/nand/nand_bch.c
@@ -158,15 +158,6 @@ struct nand_bch_control *nand_bch_init(struct mtd_info *mtd)
 
 	eccsteps = mtd->writesize/eccsize;
 
-	/*
-	 * Rely on the default ecclayout to ooblayout wrapper provided by MTD
-	 * core if ecc.layout is not NULL.
-	 * FIXME: this should be removed when all callers have moved to the
-	 * mtd_ooblayout_ops approach.
-	 */
-	if (nand->ecc.layout)
-		mtd_set_ecclayout(mtd, nand->ecc.layout);
-
 	/* if no ecc placement scheme was provided, build one */
 	if (!mtd->ooblayout) {
 
diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index a9796ba..d766c12 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -473,7 +473,6 @@ struct nand_hw_control {
  * @prepad:	padding information for syndrome based ECC generators
  * @postpad:	padding information for syndrome based ECC generators
  * @options:	ECC specific options (see NAND_ECC_XXX flags defined above)
- * @layout:	ECC layout control struct pointer
  * @priv:	pointer to private ECC control data
  * @hwctl:	function to control hardware ECC generator. Must only
  *		be provided if an hardware ECC is available
@@ -524,7 +523,6 @@ struct nand_ecc_ctrl {
 	int prepad;
 	int postpad;
 	unsigned int options;
-	struct nand_ecclayout	*layout;
 	void *priv;
 	void (*hwctl)(struct mtd_info *mtd, int mode);
 	int (*calculate)(struct mtd_info *mtd, const uint8_t *dat,
-- 
2.5.0

[PATCH v5 49/50] mtd: nand: kill the ecc->layout field

[Boris Brezillon]

Now that all NAND drivers have switch to mtd_ooblayout_ops, we can kill
the ecc->layout field.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/nand_base.c | 7 -------
 drivers/mtd/nand/nand_bch.c  | 9 ---------
 include/linux/mtd/nand.h     | 2 --
 3 files changed, 18 deletions(-)

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 3d6985e..cf0c3180 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -4162,13 +4162,6 @@ int nand_scan_tail(struct mtd_info *mtd)
 	chip->oob_poi = chip->buffers->databuf + mtd->writesize;
 
 	/*
-	 * Set the provided ECC layout. If ecc->layout is NULL, the MTD core
-	 * will just leave mtd->ooblayout to NULL, if it's not NULL, it will
-	 * set ->ooblayout to the default ecclayout wrapper.
-	 */
-	mtd_set_ecclayout(mtd, ecc->layout);
-
-	/*
 	 * If no default placement scheme is given, select an appropriate one.
 	 */
 	if (!mtd->ooblayout && (ecc->mode != NAND_ECC_SOFT_BCH)) {
diff --git a/drivers/mtd/nand/nand_bch.c b/drivers/mtd/nand/nand_bch.c
index e29e75f..ca9b2a4 100644
--- a/drivers/mtd/nand/nand_bch.c
+++ b/drivers/mtd/nand/nand_bch.c
@@ -158,15 +158,6 @@ struct nand_bch_control *nand_bch_init(struct mtd_info *mtd)
 
 	eccsteps = mtd->writesize/eccsize;
 
-	/*
-	 * Rely on the default ecclayout to ooblayout wrapper provided by MTD
-	 * core if ecc.layout is not NULL.
-	 * FIXME: this should be removed when all callers have moved to the
-	 * mtd_ooblayout_ops approach.
-	 */
-	if (nand->ecc.layout)
-		mtd_set_ecclayout(mtd, nand->ecc.layout);
-
 	/* if no ecc placement scheme was provided, build one */
 	if (!mtd->ooblayout) {
 
diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index a9796ba..d766c12 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -473,7 +473,6 @@ struct nand_hw_control {
  * @prepad:	padding information for syndrome based ECC generators
  * @postpad:	padding information for syndrome based ECC generators
  * @options:	ECC specific options (see NAND_ECC_XXX flags defined above)
- * @layout:	ECC layout control struct pointer
  * @priv:	pointer to private ECC control data
  * @hwctl:	function to control hardware ECC generator. Must only
  *		be provided if an hardware ECC is available
@@ -524,7 +523,6 @@ struct nand_ecc_ctrl {
 	int prepad;
 	int postpad;
 	unsigned int options;
-	struct nand_ecclayout	*layout;
 	void *priv;
 	void (*hwctl)(struct mtd_info *mtd, int mode);
 	int (*calculate)(struct mtd_info *mtd, const uint8_t *dat,
-- 
2.5.0

[PATCH v5 50/50] mtd: kill the nand_ecclayout struct

[Boris Brezillon]

Now that all MTD drivers have moved to the mtd_ooblayout_ops model we can
safely remove the struct nand_ecclayout definition, and all the remaining
places where it was still used.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/mtdchar.c      |  12 ++---
 drivers/mtd/mtdcore.c      | 117 ---------------------------------------------
 include/linux/mtd/mtd.h    |  20 --------
 include/uapi/mtd/mtd-abi.h |   2 +-
 4 files changed, 7 insertions(+), 144 deletions(-)

diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index 3fad2c7..2a47a3f 100644
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -465,12 +465,12 @@ static int mtdchar_readoob(struct file *file, struct mtd_info *mtd,
 }
 
 /*
- * Copies (and truncates, if necessary) data from the larger struct,
- * nand_ecclayout, to the smaller, deprecated layout struct,
- * nand_ecclayout_user. This is necessary only to support the deprecated
- * API ioctl ECCGETLAYOUT while allowing all new functionality to use
- * nand_ecclayout flexibly (i.e. the struct may change size in new
- * releases without requiring major rewrites).
+ * Copies (and truncates, if necessary) OOB layout information to the
+ * deprecated layout struct, nand_ecclayout_user. This is necessary only to
+ * support the deprecated API ioctl ECCGETLAYOUT while allowing all new
+ * functionality to use mtd_ooblayout_ops flexibly (i.e. mtd_ooblayout_ops
+ * can describe any kind of OOB layout with almost zero overhead from a
+ * memory usage point of view).
  */
 static int shrink_ecclayout(struct mtd_info *mtd,
 			    struct nand_ecclayout_user *to)
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index bebca51..cbfa5ad 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -1357,123 +1357,6 @@ int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd)
 }
 EXPORT_SYMBOL_GPL(mtd_ooblayout_count_eccbytes);
 
-/**
- * mtd_ecclayout_ecc - Default ooblayout_ecc iterator implementation
- * @mtd: MTD device structure
- * @section: ECC section. Depending on the layout you may have all the ECC
- *	     bytes stored in a single contiguous section, or one section
- *	     per ECC chunk (and sometime several sections for a single ECC
- *	     ECC chunk)
- * @oobecc: OOB region struct filled with the appropriate ECC position
- *	    information
- *
- * This function is just a wrapper around the mtd->ecclayout field and is
- * here to ease the transition to the mtd_ooblayout_ops approach.
- * All it does is convert the layout->eccpos information into proper oob
- * region definitions.
- *
- * Returns zero on success, a negative error code otherwise.
- */
-static int mtd_ecclayout_ecc(struct mtd_info *mtd, int section,
-			     struct mtd_oob_region *oobecc)
-{
-	int eccbyte = 0, cursection = 0, length = 0, eccpos = 0;
-
-	if (!mtd->ecclayout)
-		return -ENOTSUPP;
-
-	/*
-	 * This logic allows us to reuse the ->ecclayout information and
-	 * expose them as ECC regions (as done for the OOB free regions).
-	 *
-	 * TODO: this should be dropped as soon as we get rid of the
-	 * ->ecclayout field.
-	 */
-	for (eccbyte = 0; eccbyte < mtd->ecclayout->eccbytes; eccbyte++) {
-		eccpos = mtd->ecclayout->eccpos[eccbyte];
-
-		if (eccbyte < mtd->ecclayout->eccbytes - 1) {
-			int neccpos = mtd->ecclayout->eccpos[eccbyte + 1];
-
-			if (eccpos + 1 == neccpos) {
-				length++;
-				continue;
-			}
-		}
-
-		if (section == cursection)
-			break;
-
-		length = 0;
-		cursection++;
-	}
-
-	if (cursection != section || eccbyte >= mtd->ecclayout->eccbytes)
-		return -ERANGE;
-
-	oobecc->length = length + 1;
-	oobecc->offset = eccpos - length;
-
-	return 0;
-}
-
-/**
- * mtd_ecclayout_ecc - Default ooblayout_free iterator implementation
- * @mtd: MTD device structure
- * @section: Free section. Depending on the layout you may have all the free
- *	     bytes stored in a single contiguous section, or one section
- *	     per ECC chunk (and sometime several sections for a single ECC
- *	     ECC chunk)
- * @oobfree: OOB region struct filled with the appropriate free position
- *	     information
- *
- * This function is just a wrapper around the mtd->ecclayout field and is
- * here to ease the transition to the mtd_ooblayout_ops approach.
- * All it does is convert the layout->oobfree information into proper oob
- * region definitions.
- *
- * Returns zero on success, a negative error code otherwise.
- */
-static int mtd_ecclayout_free(struct mtd_info *mtd, int section,
-			      struct mtd_oob_region *oobfree)
-{
-	struct nand_ecclayout *layout = mtd->ecclayout;
-
-	if (!layout)
-		return -ENOTSUPP;
-
-	if (section >= MTD_MAX_OOBFREE_ENTRIES_LARGE ||
-	    !layout->oobfree[section].length)
-		return -ERANGE;
-
-	oobfree->offset = layout->oobfree[section].offset;
-	oobfree->length = layout->oobfree[section].length;
-
-	return 0;
-}
-
-static const struct mtd_ooblayout_ops mtd_ecclayout_wrapper_ops = {
-	.ecc = mtd_ecclayout_ecc,
-	.free = mtd_ecclayout_free,
-};
-
-/**
- * mtd_set_ecclayout - Attach an ecclayout to an MTD device
- * @mtd: MTD device structure
- * @ecclayout: The ecclayout to attach to the device
- *
- * Returns zero on success, a negative error code otherwise.
- */
-void mtd_set_ecclayout(struct mtd_info *mtd, struct nand_ecclayout *ecclayout)
-{
-	if (!mtd || !ecclayout)
-		return;
-
-	mtd->ecclayout = ecclayout;
-	mtd_set_ooblayout(mtd, &mtd_ecclayout_wrapper_ops);
-}
-EXPORT_SYMBOL_GPL(mtd_set_ecclayout);
-
 /*
  * Method to access the protection register area, present in some flash
  * devices. The user data is one time programmable but the factory data is read
diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index a38fe9a..df8c116 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -96,21 +96,6 @@ struct mtd_oob_ops {
 
 #define MTD_MAX_OOBFREE_ENTRIES_LARGE	32
 #define MTD_MAX_ECCPOS_ENTRIES_LARGE	640
-/*
- * Internal ECC layout control structure. For historical reasons, there is a
- * similar, smaller struct nand_ecclayout_user (in mtd-abi.h) that is retained
- * for export to user-space via the ECCGETLAYOUT ioctl.
- * nand_ecclayout should be expandable in the future simply by the above macros.
- *
- * This structure is now deprecated, you should use struct nand_ecclayout_ops
- * to describe your OOB layout.
- */
-struct nand_ecclayout {
-	__u32 eccbytes;
-	__u32 eccpos[MTD_MAX_ECCPOS_ENTRIES_LARGE];
-	struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES_LARGE];
-};
-
 /**
  * struct mtd_oob_region - oob region definition
  * @offset: region offset
@@ -200,9 +185,6 @@ struct mtd_info {
 	const char *name;
 	int index;
 
-	/* [Deprecated] ECC layout structure pointer - read only! */
-	struct nand_ecclayout *ecclayout;
-
 	/* OOB layout description */
 	const struct mtd_ooblayout_ops *ooblayout;
 
@@ -308,8 +290,6 @@ int mtd_ooblayout_set_databytes(struct mtd_info *mtd, const u8 *databuf,
 int mtd_ooblayout_count_freebytes(struct mtd_info *mtd);
 int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd);
 
-void mtd_set_ecclayout(struct mtd_info *mtd, struct nand_ecclayout *ecclayout);
-
 static inline void mtd_set_ooblayout(struct mtd_info *mtd,
 				     const struct mtd_ooblayout_ops *ooblayout)
 {
diff --git a/include/uapi/mtd/mtd-abi.h b/include/uapi/mtd/mtd-abi.h
index 763bb69..0ec1da2 100644
--- a/include/uapi/mtd/mtd-abi.h
+++ b/include/uapi/mtd/mtd-abi.h
@@ -228,7 +228,7 @@ struct nand_oobfree {
  * complete set of ECC information. The ioctl truncates the larger internal
  * structure to retain binary compatibility with the static declaration of the
  * ioctl. Note that the "MTD_MAX_..._ENTRIES" macros represent the max size of
- * the user struct, not the MAX size of the internal struct nand_ecclayout.
+ * the user struct, not the MAX size of the internal OOB layout representation.
  */
 struct nand_ecclayout_user {
 	__u32 eccbytes;
-- 
2.5.0

[PATCH v5 50/50] mtd: kill the nand_ecclayout struct

[Boris Brezillon]

Now that all MTD drivers have moved to the mtd_ooblayout_ops model we can
safely remove the struct nand_ecclayout definition, and all the remaining
places where it was still used.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/mtdchar.c      |  12 ++---
 drivers/mtd/mtdcore.c      | 117 ---------------------------------------------
 include/linux/mtd/mtd.h    |  20 --------
 include/uapi/mtd/mtd-abi.h |   2 +-
 4 files changed, 7 insertions(+), 144 deletions(-)

diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index 3fad2c7..2a47a3f 100644
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -465,12 +465,12 @@ static int mtdchar_readoob(struct file *file, struct mtd_info *mtd,
 }
 
 /*
- * Copies (and truncates, if necessary) data from the larger struct,
- * nand_ecclayout, to the smaller, deprecated layout struct,
- * nand_ecclayout_user. This is necessary only to support the deprecated
- * API ioctl ECCGETLAYOUT while allowing all new functionality to use
- * nand_ecclayout flexibly (i.e. the struct may change size in new
- * releases without requiring major rewrites).
+ * Copies (and truncates, if necessary) OOB layout information to the
+ * deprecated layout struct, nand_ecclayout_user. This is necessary only to
+ * support the deprecated API ioctl ECCGETLAYOUT while allowing all new
+ * functionality to use mtd_ooblayout_ops flexibly (i.e. mtd_ooblayout_ops
+ * can describe any kind of OOB layout with almost zero overhead from a
+ * memory usage point of view).
  */
 static int shrink_ecclayout(struct mtd_info *mtd,
 			    struct nand_ecclayout_user *to)
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index bebca51..cbfa5ad 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -1357,123 +1357,6 @@ int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd)
 }
 EXPORT_SYMBOL_GPL(mtd_ooblayout_count_eccbytes);
 
-/**
- * mtd_ecclayout_ecc - Default ooblayout_ecc iterator implementation
- * @mtd: MTD device structure
- * @section: ECC section. Depending on the layout you may have all the ECC
- *	     bytes stored in a single contiguous section, or one section
- *	     per ECC chunk (and sometime several sections for a single ECC
- *	     ECC chunk)
- * @oobecc: OOB region struct filled with the appropriate ECC position
- *	    information
- *
- * This function is just a wrapper around the mtd->ecclayout field and is
- * here to ease the transition to the mtd_ooblayout_ops approach.
- * All it does is convert the layout->eccpos information into proper oob
- * region definitions.
- *
- * Returns zero on success, a negative error code otherwise.
- */
-static int mtd_ecclayout_ecc(struct mtd_info *mtd, int section,
-			     struct mtd_oob_region *oobecc)
-{
-	int eccbyte = 0, cursection = 0, length = 0, eccpos = 0;
-
-	if (!mtd->ecclayout)
-		return -ENOTSUPP;
-
-	/*
-	 * This logic allows us to reuse the ->ecclayout information and
-	 * expose them as ECC regions (as done for the OOB free regions).
-	 *
-	 * TODO: this should be dropped as soon as we get rid of the
-	 * ->ecclayout field.
-	 */
-	for (eccbyte = 0; eccbyte < mtd->ecclayout->eccbytes; eccbyte++) {
-		eccpos = mtd->ecclayout->eccpos[eccbyte];
-
-		if (eccbyte < mtd->ecclayout->eccbytes - 1) {
-			int neccpos = mtd->ecclayout->eccpos[eccbyte + 1];
-
-			if (eccpos + 1 == neccpos) {
-				length++;
-				continue;
-			}
-		}
-
-		if (section == cursection)
-			break;
-
-		length = 0;
-		cursection++;
-	}
-
-	if (cursection != section || eccbyte >= mtd->ecclayout->eccbytes)
-		return -ERANGE;
-
-	oobecc->length = length + 1;
-	oobecc->offset = eccpos - length;
-
-	return 0;
-}
-
-/**
- * mtd_ecclayout_ecc - Default ooblayout_free iterator implementation
- * @mtd: MTD device structure
- * @section: Free section. Depending on the layout you may have all the free
- *	     bytes stored in a single contiguous section, or one section
- *	     per ECC chunk (and sometime several sections for a single ECC
- *	     ECC chunk)
- * @oobfree: OOB region struct filled with the appropriate free position
- *	     information
- *
- * This function is just a wrapper around the mtd->ecclayout field and is
- * here to ease the transition to the mtd_ooblayout_ops approach.
- * All it does is convert the layout->oobfree information into proper oob
- * region definitions.
- *
- * Returns zero on success, a negative error code otherwise.
- */
-static int mtd_ecclayout_free(struct mtd_info *mtd, int section,
-			      struct mtd_oob_region *oobfree)
-{
-	struct nand_ecclayout *layout = mtd->ecclayout;
-
-	if (!layout)
-		return -ENOTSUPP;
-
-	if (section >= MTD_MAX_OOBFREE_ENTRIES_LARGE ||
-	    !layout->oobfree[section].length)
-		return -ERANGE;
-
-	oobfree->offset = layout->oobfree[section].offset;
-	oobfree->length = layout->oobfree[section].length;
-
-	return 0;
-}
-
-static const struct mtd_ooblayout_ops mtd_ecclayout_wrapper_ops = {
-	.ecc = mtd_ecclayout_ecc,
-	.free = mtd_ecclayout_free,
-};
-
-/**
- * mtd_set_ecclayout - Attach an ecclayout to an MTD device
- * @mtd: MTD device structure
- * @ecclayout: The ecclayout to attach to the device
- *
- * Returns zero on success, a negative error code otherwise.
- */
-void mtd_set_ecclayout(struct mtd_info *mtd, struct nand_ecclayout *ecclayout)
-{
-	if (!mtd || !ecclayout)
-		return;
-
-	mtd->ecclayout = ecclayout;
-	mtd_set_ooblayout(mtd, &mtd_ecclayout_wrapper_ops);
-}
-EXPORT_SYMBOL_GPL(mtd_set_ecclayout);
-
 /*
  * Method to access the protection register area, present in some flash
  * devices. The user data is one time programmable but the factory data is read
diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index a38fe9a..df8c116 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -96,21 +96,6 @@ struct mtd_oob_ops {
 
 #define MTD_MAX_OOBFREE_ENTRIES_LARGE	32
 #define MTD_MAX_ECCPOS_ENTRIES_LARGE	640
-/*
- * Internal ECC layout control structure. For historical reasons, there is a
- * similar, smaller struct nand_ecclayout_user (in mtd-abi.h) that is retained
- * for export to user-space via the ECCGETLAYOUT ioctl.
- * nand_ecclayout should be expandable in the future simply by the above macros.
- *
- * This structure is now deprecated, you should use struct nand_ecclayout_ops
- * to describe your OOB layout.
- */
-struct nand_ecclayout {
-	__u32 eccbytes;
-	__u32 eccpos[MTD_MAX_ECCPOS_ENTRIES_LARGE];
-	struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES_LARGE];
-};
-
 /**
  * struct mtd_oob_region - oob region definition
  * @offset: region offset
@@ -200,9 +185,6 @@ struct mtd_info {
 	const char *name;
 	int index;
 
-	/* [Deprecated] ECC layout structure pointer - read only! */
-	struct nand_ecclayout *ecclayout;
-
 	/* OOB layout description */
 	const struct mtd_ooblayout_ops *ooblayout;
 
@@ -308,8 +290,6 @@ int mtd_ooblayout_set_databytes(struct mtd_info *mtd, const u8 *databuf,
 int mtd_ooblayout_count_freebytes(struct mtd_info *mtd);
 int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd);
 
-void mtd_set_ecclayout(struct mtd_info *mtd, struct nand_ecclayout *ecclayout);
-
 static inline void mtd_set_ooblayout(struct mtd_info *mtd,
 				     const struct mtd_ooblayout_ops *ooblayout)
 {
diff --git a/include/uapi/mtd/mtd-abi.h b/include/uapi/mtd/mtd-abi.h
index 763bb69..0ec1da2 100644
--- a/include/uapi/mtd/mtd-abi.h
+++ b/include/uapi/mtd/mtd-abi.h
@@ -228,7 +228,7 @@ struct nand_oobfree {
  * complete set of ECC information. The ioctl truncates the larger internal
  * structure to retain binary compatibility with the static declaration of the
  * ioctl. Note that the "MTD_MAX_..._ENTRIES" macros represent the max size of
- * the user struct, not the MAX size of the internal struct nand_ecclayout.
+ * the user struct, not the MAX size of the internal OOB layout representation.
  */
 struct nand_ecclayout_user {
 	__u32 eccbytes;
-- 
2.5.0

[PATCH v5 50/50] mtd: kill the nand_ecclayout struct

[Boris Brezillon]

Now that all MTD drivers have moved to the mtd_ooblayout_ops model we can
safely remove the struct nand_ecclayout definition, and all the remaining
places where it was still used.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/mtdchar.c      |  12 ++---
 drivers/mtd/mtdcore.c      | 117 ---------------------------------------------
 include/linux/mtd/mtd.h    |  20 --------
 include/uapi/mtd/mtd-abi.h |   2 +-
 4 files changed, 7 insertions(+), 144 deletions(-)

diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index 3fad2c7..2a47a3f 100644
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -465,12 +465,12 @@ static int mtdchar_readoob(struct file *file, struct mtd_info *mtd,
 }
 
 /*
- * Copies (and truncates, if necessary) data from the larger struct,
- * nand_ecclayout, to the smaller, deprecated layout struct,
- * nand_ecclayout_user. This is necessary only to support the deprecated
- * API ioctl ECCGETLAYOUT while allowing all new functionality to use
- * nand_ecclayout flexibly (i.e. the struct may change size in new
- * releases without requiring major rewrites).
+ * Copies (and truncates, if necessary) OOB layout information to the
+ * deprecated layout struct, nand_ecclayout_user. This is necessary only to
+ * support the deprecated API ioctl ECCGETLAYOUT while allowing all new
+ * functionality to use mtd_ooblayout_ops flexibly (i.e. mtd_ooblayout_ops
+ * can describe any kind of OOB layout with almost zero overhead from a
+ * memory usage point of view).
  */
 static int shrink_ecclayout(struct mtd_info *mtd,
 			    struct nand_ecclayout_user *to)
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index bebca51..cbfa5ad 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -1357,123 +1357,6 @@ int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd)
 }
 EXPORT_SYMBOL_GPL(mtd_ooblayout_count_eccbytes);
 
-/**
- * mtd_ecclayout_ecc - Default ooblayout_ecc iterator implementation
- * @mtd: MTD device structure
- * @section: ECC section. Depending on the layout you may have all the ECC
- *	     bytes stored in a single contiguous section, or one section
- *	     per ECC chunk (and sometime several sections for a single ECC
- *	     ECC chunk)
- * @oobecc: OOB region struct filled with the appropriate ECC position
- *	    information
- *
- * This function is just a wrapper around the mtd->ecclayout field and is
- * here to ease the transition to the mtd_ooblayout_ops approach.
- * All it does is convert the layout->eccpos information into proper oob
- * region definitions.
- *
- * Returns zero on success, a negative error code otherwise.
- */
-static int mtd_ecclayout_ecc(struct mtd_info *mtd, int section,
-			     struct mtd_oob_region *oobecc)
-{
-	int eccbyte = 0, cursection = 0, length = 0, eccpos = 0;
-
-	if (!mtd->ecclayout)
-		return -ENOTSUPP;
-
-	/*
-	 * This logic allows us to reuse the ->ecclayout information and
-	 * expose them as ECC regions (as done for the OOB free regions).
-	 *
-	 * TODO: this should be dropped as soon as we get rid of the
-	 * ->ecclayout field.
-	 */
-	for (eccbyte = 0; eccbyte < mtd->ecclayout->eccbytes; eccbyte++) {
-		eccpos = mtd->ecclayout->eccpos[eccbyte];
-
-		if (eccbyte < mtd->ecclayout->eccbytes - 1) {
-			int neccpos = mtd->ecclayout->eccpos[eccbyte + 1];
-
-			if (eccpos + 1 == neccpos) {
-				length++;
-				continue;
-			}
-		}
-
-		if (section == cursection)
-			break;
-
-		length = 0;
-		cursection++;
-	}
-
-	if (cursection != section || eccbyte >= mtd->ecclayout->eccbytes)
-		return -ERANGE;
-
-	oobecc->length = length + 1;
-	oobecc->offset = eccpos - length;
-
-	return 0;
-}
-
-/**
- * mtd_ecclayout_ecc - Default ooblayout_free iterator implementation
- * @mtd: MTD device structure
- * @section: Free section. Depending on the layout you may have all the free
- *	     bytes stored in a single contiguous section, or one section
- *	     per ECC chunk (and sometime several sections for a single ECC
- *	     ECC chunk)
- * @oobfree: OOB region struct filled with the appropriate free position
- *	     information
- *
- * This function is just a wrapper around the mtd->ecclayout field and is
- * here to ease the transition to the mtd_ooblayout_ops approach.
- * All it does is convert the layout->oobfree information into proper oob
- * region definitions.
- *
- * Returns zero on success, a negative error code otherwise.
- */
-static int mtd_ecclayout_free(struct mtd_info *mtd, int section,
-			      struct mtd_oob_region *oobfree)
-{
-	struct nand_ecclayout *layout = mtd->ecclayout;
-
-	if (!layout)
-		return -ENOTSUPP;
-
-	if (section >= MTD_MAX_OOBFREE_ENTRIES_LARGE ||
-	    !layout->oobfree[section].length)
-		return -ERANGE;
-
-	oobfree->offset = layout->oobfree[section].offset;
-	oobfree->length = layout->oobfree[section].length;
-
-	return 0;
-}
-
-static const struct mtd_ooblayout_ops mtd_ecclayout_wrapper_ops = {
-	.ecc = mtd_ecclayout_ecc,
-	.free = mtd_ecclayout_free,
-};
-
-/**
- * mtd_set_ecclayout - Attach an ecclayout to an MTD device
- * @mtd: MTD device structure
- * @ecclayout: The ecclayout to attach to the device
- *
- * Returns zero on success, a negative error code otherwise.
- */
-void mtd_set_ecclayout(struct mtd_info *mtd, struct nand_ecclayout *ecclayout)
-{
-	if (!mtd || !ecclayout)
-		return;
-
-	mtd->ecclayout = ecclayout;
-	mtd_set_ooblayout(mtd, &mtd_ecclayout_wrapper_ops);
-}
-EXPORT_SYMBOL_GPL(mtd_set_ecclayout);
-
 /*
  * Method to access the protection register area, present in some flash
  * devices. The user data is one time programmable but the factory data is read
diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index a38fe9a..df8c116 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -96,21 +96,6 @@ struct mtd_oob_ops {
 
 #define MTD_MAX_OOBFREE_ENTRIES_LARGE	32
 #define MTD_MAX_ECCPOS_ENTRIES_LARGE	640
-/*
- * Internal ECC layout control structure. For historical reasons, there is a
- * similar, smaller struct nand_ecclayout_user (in mtd-abi.h) that is retained
- * for export to user-space via the ECCGETLAYOUT ioctl.
- * nand_ecclayout should be expandable in the future simply by the above macros.
- *
- * This structure is now deprecated, you should use struct nand_ecclayout_ops
- * to describe your OOB layout.
- */
-struct nand_ecclayout {
-	__u32 eccbytes;
-	__u32 eccpos[MTD_MAX_ECCPOS_ENTRIES_LARGE];
-	struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES_LARGE];
-};
-
 /**
  * struct mtd_oob_region - oob region definition
  * @offset: region offset
@@ -200,9 +185,6 @@ struct mtd_info {
 	const char *name;
 	int index;
 
-	/* [Deprecated] ECC layout structure pointer - read only! */
-	struct nand_ecclayout *ecclayout;
-
 	/* OOB layout description */
 	const struct mtd_ooblayout_ops *ooblayout;
 
@@ -308,8 +290,6 @@ int mtd_ooblayout_set_databytes(struct mtd_info *mtd, const u8 *databuf,
 int mtd_ooblayout_count_freebytes(struct mtd_info *mtd);
 int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd);
 
-void mtd_set_ecclayout(struct mtd_info *mtd, struct nand_ecclayout *ecclayout);
-
 static inline void mtd_set_ooblayout(struct mtd_info *mtd,
 				     const struct mtd_ooblayout_ops *ooblayout)
 {
diff --git a/include/uapi/mtd/mtd-abi.h b/include/uapi/mtd/mtd-abi.h
index 763bb69..0ec1da2 100644
--- a/include/uapi/mtd/mtd-abi.h
+++ b/include/uapi/mtd/mtd-abi.h
@@ -228,7 +228,7 @@ struct nand_oobfree {
  * complete set of ECC information. The ioctl truncates the larger internal
  * structure to retain binary compatibility with the static declaration of the
  * ioctl. Note that the "MTD_MAX_..._ENTRIES" macros represent the max size of
- * the user struct, not the MAX size of the internal struct nand_ecclayout.
+ * the user struct, not the MAX size of the internal OOB layout representation.
  */
 struct nand_ecclayout_user {
 	__u32 eccbytes;
-- 
2.5.0

Re: [PATCH v5 00/52] mtd: rework ECC layout definition

[Boris Brezillon]

Despite what's said in the subject, this series only contains 50
patches, not 52.

On Wed, 30 Mar 2016 18:14:15 +0200
Boris Brezillon <boris.brezillon@free-electrons.com> wrote:

> Hello,
> 
> Hopefully the last version of this patchset (but don't be sad, I'm not
> done bothering you with NAND related patches :-)).
> 
> If possible, I'd like to have as much Tested/Reviewed/Acked-by tags as
> possible, particularly on the changes done in arch/arm and arch/mips
> (since the last set of commits depends on those changes, I'd like to
> take them in my nand/next branch, even if this imply creating an
> immutable branch for the ARM and MIPS maintainers).
> 
> If nobody complains about this version, I'll merge it in 4.7.
> 
> Here comes the usual description:
> 
> This patchset aims at getting rid of the nand_ecclayout limitations.
> struct nand_ecclayout is defining fixed eccpos and oobfree arrays which
> can only be increased by modifying the MTD_MAX_ECCPOS_ENTRIES_LARGE and
> MTD_MAX_OOBFREE_ENTRIES_LARGE macros.
> This approach forces us to modify the macro values each time we add a
> new NAND chip with a bigger OOB area, and increasing these arrays also
> penalize all platforms, even those who only support small NAND devices
> (with small OOB area).
> 
> The idea to overcome this limitation, is to define the ECC/OOB layout
> by the mean of two functions: ->ecc() and ->free(), which will
> basically return the same information has those stored in the
> nand_ecclayout struct.
> 
> Another advantage of this solution is that ECC layouts are usually
> following a repetitive pattern (i.e. leave X bytes free and put Y bytes
> of ECC per ECC chunk), which allows one to implement the ->ecc()
> and ->free() functions with a simple logic that can be applied
> to any size of OOB.
> 
> Patches 1 to 4 are just cleanups or trivial fixes that can be taken
> independently.
> 
> Also note that the last two commits are removing the nand_ecclayout
> definition, thus preventing any new driver to use this structure.
> Of course, this step can be delayed if some of the previous patches
> are not accepted.
> 
> All those changes are available here [1].
> 
> Best Regards,
> 
> Boris
> 
> [1]https://github.com/bbrezillon/linux-0day/tree/nand/ecclayout
> 
> Changes since v4:
> - dropped already applied patches
> - patch the recently merged qcom driver
> 
> Changes since v3:
> - fixed two bugs in mtd_ooblayout core implementation
> - use ecc->total instead of (ecc->steps * ecc->bytes) in NAND drivers
> 
> Changes since v2:
> - fixed a few bugs in the core and driver implementations
> 
> Changes since v1:
> - unified the way of defining ECC and free bytes
> - fixed a few bugs in some ->ecc()/->free() implementations
> 
> Boris Brezillon (50):
>   mtd: add mtd_ooblayout_xxx() helper functions
>   mtd: use mtd_ooblayout_xxx() helpers where appropriate
>   mtd: nand: core: use mtd_ooblayout_xxx() helpers where appropriate
>   mtd: nand: atmel: use mtd_ooblayout_xxx() helpers where appropriate
>   mtd: nand: fsl_ifc: use mtd_ooblayout_xxx() helpers where appropriate
>   mtd: nand: gpmi: use mtd_ooblayout_xxx() helpers where appropriate
>   mtd: nand: lpc32xx: use mtd_ooblayout_xxx() helpers where appropriate
>   mtd: nand: omap2: use mtd_ooblayout_xxx() helpers where appropriate
>   mtd: nand: qcom: use mtd_ooblayout_xxx() helpers where appropriate
>   mtd: onenand: use mtd_ooblayout_xxx() helpers where appropriate
>   mtd: add mtd_set_ecclayout() helper function
>   mtd: use mtd_set_ecclayout() where appropriate
>   mtd: nand: use mtd_set_ecclayout() where appropriate
>   mtd: onenand: use mtd_set_ecclayout() where appropriate
>   mtd: docg3: use mtd_set_ecclayout() where appropriate
>   mtd: create an mtd_ooblayout_ops struct to ease ECC layout definition
>   mtd: docg3: switch to mtd_ooblayout_ops
>   mtd: nand: implement the default mtd_ooblayout_ops
>   mtd: nand: bch: switch to mtd_ooblayout_ops
>   mtd: nand: sharpsl: switch to mtd_ooblayout_ops
>   mtd: nand: jz4740: switch to mtd_ooblayout_ops
>   mtd: nand: atmel: switch to mtd_ooblayout_ops
>   mtd: nand: bf5xx: switch to mtd_ooblayout_ops
>   mtd: nand: brcm: switch to mtd_ooblayout_ops
>   mtd: nand: cafe: switch to mtd_ooblayout_ops
>   mtd: nand: davinci: switch to mtd_ooblayout_ops
>   mtd: nand: denali: switch to mtd_ooblayout_ops
>   mtd: nand: diskonchip: switch to mtd_ooblayout_ops
>   mtd: nand: docg4: switch to mtd_ooblayout_ops
>   mtd: nand: fsl_elbc: switch to mtd_ooblayout_ops
>   mtd: nand: fsl_ifc: switch to mtd_ooblayout_ops
>   mtd: nand: fsmc: switch to mtd_ooblayout_ops
>   mtd: nand: fsmc: get rid of the fsmc_nand_eccplace struct
>   mtd: nand: gpmi: switch to mtd_ooblayout_ops
>   mtd: nand: hisi504: switch to mtd_ooblayout_ops
>   mtd: nand: jz4780: switch to mtd_ooblayout_ops
>   mtd: nand: lpc32xx: switch to mtd_ooblayout_ops
>   mtd: nand: mxc: switch to mtd_ooblayout_ops
>   mtd: nand: omap2: switch to mtd_ooblayout_ops
>   mtd: nand: pxa3xx: switch to mtd_ooblayout_ops
>   mtd: nand: s3c2410: switch to mtd_ooblayout_ops
>   mtd: nand: sh_flctl: switch to mtd_ooblayout_ops
>   mtd: nand: sm_common: switch to mtd_ooblayout_ops
>   mtd: nand: sunxi: switch to mtd_ooblayout_ops
>   mtd: nand: vf610: switch to mtd_ooblayout_ops
>   mtd: nand: qcom: switch to mtd_ooblayout_ops
>   mtd: onenand: switch to mtd_ooblayout_ops
>   staging: mt29f_spinand: switch to mtd_ooblayout_ops
>   mtd: nand: kill the ecc->layout field
>   mtd: kill the nand_ecclayout struct
> 
>  arch/arm/mach-pxa/spitz.c                       |  55 +++-
>  arch/mips/include/asm/mach-jz4740/jz4740_nand.h |   2 +-
>  arch/mips/jz4740/board-qi_lb60.c                |  87 +++---
>  drivers/mtd/devices/docg3.c                     |  46 ++-
>  drivers/mtd/mtdchar.c                           | 123 ++++++--
>  drivers/mtd/mtdconcat.c                         |   2 +-
>  drivers/mtd/mtdcore.c                           | 360 ++++++++++++++++++++++++
>  drivers/mtd/mtdpart.c                           |  23 +-
>  drivers/mtd/nand/atmel_nand.c                   | 130 ++++-----
>  drivers/mtd/nand/bf5xx_nand.c                   |  51 ++--
>  drivers/mtd/nand/brcmnand/brcmnand.c            | 258 ++++++++++-------
>  drivers/mtd/nand/cafe_nand.c                    |  44 ++-
>  drivers/mtd/nand/davinci_nand.c                 | 118 +++-----
>  drivers/mtd/nand/denali.c                       |  50 +++-
>  drivers/mtd/nand/diskonchip.c                   |  60 +++-
>  drivers/mtd/nand/docg4.c                        |  33 ++-
>  drivers/mtd/nand/fsl_elbc_nand.c                |  83 +++---
>  drivers/mtd/nand/fsl_ifc_nand.c                 | 244 +++++-----------
>  drivers/mtd/nand/fsmc_nand.c                    | 322 ++++++---------------
>  drivers/mtd/nand/gpmi-nand/gpmi-nand.c          |  61 ++--
>  drivers/mtd/nand/hisi504_nand.c                 |  26 +-
>  drivers/mtd/nand/jz4740_nand.c                  |   2 +-
>  drivers/mtd/nand/jz4780_nand.c                  |  19 +-
>  drivers/mtd/nand/lpc32xx_mlc.c                  |  50 ++--
>  drivers/mtd/nand/lpc32xx_slc.c                  |  58 +++-
>  drivers/mtd/nand/mxc_nand.c                     | 212 +++++++-------
>  drivers/mtd/nand/nand_base.c                    | 340 +++++++++++-----------
>  drivers/mtd/nand/nand_bch.c                     |  27 +-
>  drivers/mtd/nand/omap2.c                        | 217 ++++++++------
>  drivers/mtd/nand/pxa3xx_nand.c                  | 104 ++++---
>  drivers/mtd/nand/qcom_nandc.c                   |  87 +++---
>  drivers/mtd/nand/s3c2410.c                      |  32 ++-
>  drivers/mtd/nand/sh_flctl.c                     |  87 ++++--
>  drivers/mtd/nand/sharpsl.c                      |   2 +-
>  drivers/mtd/nand/sm_common.c                    |  93 ++++--
>  drivers/mtd/nand/sunxi_nand.c                   | 114 ++++----
>  drivers/mtd/nand/vf610_nfc.c                    |  34 +--
>  drivers/mtd/onenand/onenand_base.c              | 235 ++++++++--------
>  drivers/staging/mt29f_spinand/mt29f_spinand.c   |  48 ++--
>  include/linux/mtd/fsmc.h                        |  18 --
>  include/linux/mtd/mtd.h                         |  63 ++++-
>  include/linux/mtd/nand.h                        |   5 +-
>  include/linux/mtd/onenand.h                     |   2 -
>  include/linux/mtd/sharpsl.h                     |   2 +-
>  include/uapi/mtd/mtd-abi.h                      |   2 +-
>  45 files changed, 2340 insertions(+), 1691 deletions(-)
> 



-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

Re: [PATCH v5 00/52] mtd: rework ECC layout definition

[Boris Brezillon]

Despite what's said in the subject, this series only contains 50
patches, not 52.

On Wed, 30 Mar 2016 18:14:15 +0200
Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org> wrote:

> Hello,
> 
> Hopefully the last version of this patchset (but don't be sad, I'm not
> done bothering you with NAND related patches :-)).
> 
> If possible, I'd like to have as much Tested/Reviewed/Acked-by tags as
> possible, particularly on the changes done in arch/arm and arch/mips
> (since the last set of commits depends on those changes, I'd like to
> take them in my nand/next branch, even if this imply creating an
> immutable branch for the ARM and MIPS maintainers).
> 
> If nobody complains about this version, I'll merge it in 4.7.
> 
> Here comes the usual description:
> 
> This patchset aims at getting rid of the nand_ecclayout limitations.
> struct nand_ecclayout is defining fixed eccpos and oobfree arrays which
> can only be increased by modifying the MTD_MAX_ECCPOS_ENTRIES_LARGE and
> MTD_MAX_OOBFREE_ENTRIES_LARGE macros.
> This approach forces us to modify the macro values each time we add a
> new NAND chip with a bigger OOB area, and increasing these arrays also
> penalize all platforms, even those who only support small NAND devices
> (with small OOB area).
> 
> The idea to overcome this limitation, is to define the ECC/OOB layout
> by the mean of two functions: ->ecc() and ->free(), which will
> basically return the same information has those stored in the
> nand_ecclayout struct.
> 
> Another advantage of this solution is that ECC layouts are usually
> following a repetitive pattern (i.e. leave X bytes free and put Y bytes
> of ECC per ECC chunk), which allows one to implement the ->ecc()
> and ->free() functions with a simple logic that can be applied
> to any size of OOB.
> 
> Patches 1 to 4 are just cleanups or trivial fixes that can be taken
> independently.
> 
> Also note that the last two commits are removing the nand_ecclayout
> definition, thus preventing any new driver to use this structure.
> Of course, this step can be delayed if some of the previous patches
> are not accepted.
> 
> All those changes are available here [1].
> 
> Best Regards,
> 
> Boris
> 
> [1]https://github.com/bbrezillon/linux-0day/tree/nand/ecclayout
> 
> Changes since v4:
> - dropped already applied patches
> - patch the recently merged qcom driver
> 
> Changes since v3:
> - fixed two bugs in mtd_ooblayout core implementation
> - use ecc->total instead of (ecc->steps * ecc->bytes) in NAND drivers
> 
> Changes since v2:
> - fixed a few bugs in the core and driver implementations
> 
> Changes since v1:
> - unified the way of defining ECC and free bytes
> - fixed a few bugs in some ->ecc()/->free() implementations
> 
> Boris Brezillon (50):
>   mtd: add mtd_ooblayout_xxx() helper functions
>   mtd: use mtd_ooblayout_xxx() helpers where appropriate
>   mtd: nand: core: use mtd_ooblayout_xxx() helpers where appropriate
>   mtd: nand: atmel: use mtd_ooblayout_xxx() helpers where appropriate
>   mtd: nand: fsl_ifc: use mtd_ooblayout_xxx() helpers where appropriate
>   mtd: nand: gpmi: use mtd_ooblayout_xxx() helpers where appropriate
>   mtd: nand: lpc32xx: use mtd_ooblayout_xxx() helpers where appropriate
>   mtd: nand: omap2: use mtd_ooblayout_xxx() helpers where appropriate
>   mtd: nand: qcom: use mtd_ooblayout_xxx() helpers where appropriate
>   mtd: onenand: use mtd_ooblayout_xxx() helpers where appropriate
>   mtd: add mtd_set_ecclayout() helper function
>   mtd: use mtd_set_ecclayout() where appropriate
>   mtd: nand: use mtd_set_ecclayout() where appropriate
>   mtd: onenand: use mtd_set_ecclayout() where appropriate
>   mtd: docg3: use mtd_set_ecclayout() where appropriate
>   mtd: create an mtd_ooblayout_ops struct to ease ECC layout definition
>   mtd: docg3: switch to mtd_ooblayout_ops
>   mtd: nand: implement the default mtd_ooblayout_ops
>   mtd: nand: bch: switch to mtd_ooblayout_ops
>   mtd: nand: sharpsl: switch to mtd_ooblayout_ops
>   mtd: nand: jz4740: switch to mtd_ooblayout_ops
>   mtd: nand: atmel: switch to mtd_ooblayout_ops
>   mtd: nand: bf5xx: switch to mtd_ooblayout_ops
>   mtd: nand: brcm: switch to mtd_ooblayout_ops
>   mtd: nand: cafe: switch to mtd_ooblayout_ops
>   mtd: nand: davinci: switch to mtd_ooblayout_ops
>   mtd: nand: denali: switch to mtd_ooblayout_ops
>   mtd: nand: diskonchip: switch to mtd_ooblayout_ops
>   mtd: nand: docg4: switch to mtd_ooblayout_ops
>   mtd: nand: fsl_elbc: switch to mtd_ooblayout_ops
>   mtd: nand: fsl_ifc: switch to mtd_ooblayout_ops
>   mtd: nand: fsmc: switch to mtd_ooblayout_ops
>   mtd: nand: fsmc: get rid of the fsmc_nand_eccplace struct
>   mtd: nand: gpmi: switch to mtd_ooblayout_ops
>   mtd: nand: hisi504: switch to mtd_ooblayout_ops
>   mtd: nand: jz4780: switch to mtd_ooblayout_ops
>   mtd: nand: lpc32xx: switch to mtd_ooblayout_ops
>   mtd: nand: mxc: switch to mtd_ooblayout_ops
>   mtd: nand: omap2: switch to mtd_ooblayout_ops
>   mtd: nand: pxa3xx: switch to mtd_ooblayout_ops
>   mtd: nand: s3c2410: switch to mtd_ooblayout_ops
>   mtd: nand: sh_flctl: switch to mtd_ooblayout_ops
>   mtd: nand: sm_common: switch to mtd_ooblayout_ops
>   mtd: nand: sunxi: switch to mtd_ooblayout_ops
>   mtd: nand: vf610: switch to mtd_ooblayout_ops
>   mtd: nand: qcom: switch to mtd_ooblayout_ops
>   mtd: onenand: switch to mtd_ooblayout_ops
>   staging: mt29f_spinand: switch to mtd_ooblayout_ops
>   mtd: nand: kill the ecc->layout field
>   mtd: kill the nand_ecclayout struct
> 
>  arch/arm/mach-pxa/spitz.c                       |  55 +++-
>  arch/mips/include/asm/mach-jz4740/jz4740_nand.h |   2 +-
>  arch/mips/jz4740/board-qi_lb60.c                |  87 +++---
>  drivers/mtd/devices/docg3.c                     |  46 ++-
>  drivers/mtd/mtdchar.c                           | 123 ++++++--
>  drivers/mtd/mtdconcat.c                         |   2 +-
>  drivers/mtd/mtdcore.c                           | 360 ++++++++++++++++++++++++
>  drivers/mtd/mtdpart.c                           |  23 +-
>  drivers/mtd/nand/atmel_nand.c                   | 130 ++++-----
>  drivers/mtd/nand/bf5xx_nand.c                   |  51 ++--
>  drivers/mtd/nand/brcmnand/brcmnand.c            | 258 ++++++++++-------
>  drivers/mtd/nand/cafe_nand.c                    |  44 ++-
>  drivers/mtd/nand/davinci_nand.c                 | 118 +++-----
>  drivers/mtd/nand/denali.c                       |  50 +++-
>  drivers/mtd/nand/diskonchip.c                   |  60 +++-
>  drivers/mtd/nand/docg4.c                        |  33 ++-
>  drivers/mtd/nand/fsl_elbc_nand.c                |  83 +++---
>  drivers/mtd/nand/fsl_ifc_nand.c                 | 244 +++++-----------
>  drivers/mtd/nand/fsmc_nand.c                    | 322 ++++++---------------
>  drivers/mtd/nand/gpmi-nand/gpmi-nand.c          |  61 ++--
>  drivers/mtd/nand/hisi504_nand.c                 |  26 +-
>  drivers/mtd/nand/jz4740_nand.c                  |   2 +-
>  drivers/mtd/nand/jz4780_nand.c                  |  19 +-
>  drivers/mtd/nand/lpc32xx_mlc.c                  |  50 ++--
>  drivers/mtd/nand/lpc32xx_slc.c                  |  58 +++-
>  drivers/mtd/nand/mxc_nand.c                     | 212 +++++++-------
>  drivers/mtd/nand/nand_base.c                    | 340 +++++++++++-----------
>  drivers/mtd/nand/nand_bch.c                     |  27 +-
>  drivers/mtd/nand/omap2.c                        | 217 ++++++++------
>  drivers/mtd/nand/pxa3xx_nand.c                  | 104 ++++---
>  drivers/mtd/nand/qcom_nandc.c                   |  87 +++---
>  drivers/mtd/nand/s3c2410.c                      |  32 ++-
>  drivers/mtd/nand/sh_flctl.c                     |  87 ++++--
>  drivers/mtd/nand/sharpsl.c                      |   2 +-
>  drivers/mtd/nand/sm_common.c                    |  93 ++++--
>  drivers/mtd/nand/sunxi_nand.c                   | 114 ++++----
>  drivers/mtd/nand/vf610_nfc.c                    |  34 +--
>  drivers/mtd/onenand/onenand_base.c              | 235 ++++++++--------
>  drivers/staging/mt29f_spinand/mt29f_spinand.c   |  48 ++--
>  include/linux/mtd/fsmc.h                        |  18 --
>  include/linux/mtd/mtd.h                         |  63 ++++-
>  include/linux/mtd/nand.h                        |   5 +-
>  include/linux/mtd/onenand.h                     |   2 -
>  include/linux/mtd/sharpsl.h                     |   2 +-
>  include/uapi/mtd/mtd-abi.h                      |   2 +-
>  45 files changed, 2340 insertions(+), 1691 deletions(-)
> 



-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

[PATCH v5 00/52] mtd: rework ECC layout definition

[Boris Brezillon]

Despite what's said in the subject, this series only contains 50
patches, not 52.

On Wed, 30 Mar 2016 18:14:15 +0200
Boris Brezillon <boris.brezillon@free-electrons.com> wrote:

> Hello,
> 
> Hopefully the last version of this patchset (but don't be sad, I'm not
> done bothering you with NAND related patches :-)).
> 
> If possible, I'd like to have as much Tested/Reviewed/Acked-by tags as
> possible, particularly on the changes done in arch/arm and arch/mips
> (since the last set of commits depends on those changes, I'd like to
> take them in my nand/next branch, even if this imply creating an
> immutable branch for the ARM and MIPS maintainers).
> 
> If nobody complains about this version, I'll merge it in 4.7.
> 
> Here comes the usual description:
> 
> This patchset aims at getting rid of the nand_ecclayout limitations.
> struct nand_ecclayout is defining fixed eccpos and oobfree arrays which
> can only be increased by modifying the MTD_MAX_ECCPOS_ENTRIES_LARGE and
> MTD_MAX_OOBFREE_ENTRIES_LARGE macros.
> This approach forces us to modify the macro values each time we add a
> new NAND chip with a bigger OOB area, and increasing these arrays also
> penalize all platforms, even those who only support small NAND devices
> (with small OOB area).
> 
> The idea to overcome this limitation, is to define the ECC/OOB layout
> by the mean of two functions: ->ecc() and ->free(), which will
> basically return the same information has those stored in the
> nand_ecclayout struct.
> 
> Another advantage of this solution is that ECC layouts are usually
> following a repetitive pattern (i.e. leave X bytes free and put Y bytes
> of ECC per ECC chunk), which allows one to implement the ->ecc()
> and ->free() functions with a simple logic that can be applied
> to any size of OOB.
> 
> Patches 1 to 4 are just cleanups or trivial fixes that can be taken
> independently.
> 
> Also note that the last two commits are removing the nand_ecclayout
> definition, thus preventing any new driver to use this structure.
> Of course, this step can be delayed if some of the previous patches
> are not accepted.
> 
> All those changes are available here [1].
> 
> Best Regards,
> 
> Boris
> 
> [1]https://github.com/bbrezillon/linux-0day/tree/nand/ecclayout
> 
> Changes since v4:
> - dropped already applied patches
> - patch the recently merged qcom driver
> 
> Changes since v3:
> - fixed two bugs in mtd_ooblayout core implementation
> - use ecc->total instead of (ecc->steps * ecc->bytes) in NAND drivers
> 
> Changes since v2:
> - fixed a few bugs in the core and driver implementations
> 
> Changes since v1:
> - unified the way of defining ECC and free bytes
> - fixed a few bugs in some ->ecc()/->free() implementations
> 
> Boris Brezillon (50):
>   mtd: add mtd_ooblayout_xxx() helper functions
>   mtd: use mtd_ooblayout_xxx() helpers where appropriate
>   mtd: nand: core: use mtd_ooblayout_xxx() helpers where appropriate
>   mtd: nand: atmel: use mtd_ooblayout_xxx() helpers where appropriate
>   mtd: nand: fsl_ifc: use mtd_ooblayout_xxx() helpers where appropriate
>   mtd: nand: gpmi: use mtd_ooblayout_xxx() helpers where appropriate
>   mtd: nand: lpc32xx: use mtd_ooblayout_xxx() helpers where appropriate
>   mtd: nand: omap2: use mtd_ooblayout_xxx() helpers where appropriate
>   mtd: nand: qcom: use mtd_ooblayout_xxx() helpers where appropriate
>   mtd: onenand: use mtd_ooblayout_xxx() helpers where appropriate
>   mtd: add mtd_set_ecclayout() helper function
>   mtd: use mtd_set_ecclayout() where appropriate
>   mtd: nand: use mtd_set_ecclayout() where appropriate
>   mtd: onenand: use mtd_set_ecclayout() where appropriate
>   mtd: docg3: use mtd_set_ecclayout() where appropriate
>   mtd: create an mtd_ooblayout_ops struct to ease ECC layout definition
>   mtd: docg3: switch to mtd_ooblayout_ops
>   mtd: nand: implement the default mtd_ooblayout_ops
>   mtd: nand: bch: switch to mtd_ooblayout_ops
>   mtd: nand: sharpsl: switch to mtd_ooblayout_ops
>   mtd: nand: jz4740: switch to mtd_ooblayout_ops
>   mtd: nand: atmel: switch to mtd_ooblayout_ops
>   mtd: nand: bf5xx: switch to mtd_ooblayout_ops
>   mtd: nand: brcm: switch to mtd_ooblayout_ops
>   mtd: nand: cafe: switch to mtd_ooblayout_ops
>   mtd: nand: davinci: switch to mtd_ooblayout_ops
>   mtd: nand: denali: switch to mtd_ooblayout_ops
>   mtd: nand: diskonchip: switch to mtd_ooblayout_ops
>   mtd: nand: docg4: switch to mtd_ooblayout_ops
>   mtd: nand: fsl_elbc: switch to mtd_ooblayout_ops
>   mtd: nand: fsl_ifc: switch to mtd_ooblayout_ops
>   mtd: nand: fsmc: switch to mtd_ooblayout_ops
>   mtd: nand: fsmc: get rid of the fsmc_nand_eccplace struct
>   mtd: nand: gpmi: switch to mtd_ooblayout_ops
>   mtd: nand: hisi504: switch to mtd_ooblayout_ops
>   mtd: nand: jz4780: switch to mtd_ooblayout_ops
>   mtd: nand: lpc32xx: switch to mtd_ooblayout_ops
>   mtd: nand: mxc: switch to mtd_ooblayout_ops
>   mtd: nand: omap2: switch to mtd_ooblayout_ops
>   mtd: nand: pxa3xx: switch to mtd_ooblayout_ops
>   mtd: nand: s3c2410: switch to mtd_ooblayout_ops
>   mtd: nand: sh_flctl: switch to mtd_ooblayout_ops
>   mtd: nand: sm_common: switch to mtd_ooblayout_ops
>   mtd: nand: sunxi: switch to mtd_ooblayout_ops
>   mtd: nand: vf610: switch to mtd_ooblayout_ops
>   mtd: nand: qcom: switch to mtd_ooblayout_ops
>   mtd: onenand: switch to mtd_ooblayout_ops
>   staging: mt29f_spinand: switch to mtd_ooblayout_ops
>   mtd: nand: kill the ecc->layout field
>   mtd: kill the nand_ecclayout struct
> 
>  arch/arm/mach-pxa/spitz.c                       |  55 +++-
>  arch/mips/include/asm/mach-jz4740/jz4740_nand.h |   2 +-
>  arch/mips/jz4740/board-qi_lb60.c                |  87 +++---
>  drivers/mtd/devices/docg3.c                     |  46 ++-
>  drivers/mtd/mtdchar.c                           | 123 ++++++--
>  drivers/mtd/mtdconcat.c                         |   2 +-
>  drivers/mtd/mtdcore.c                           | 360 ++++++++++++++++++++++++
>  drivers/mtd/mtdpart.c                           |  23 +-
>  drivers/mtd/nand/atmel_nand.c                   | 130 ++++-----
>  drivers/mtd/nand/bf5xx_nand.c                   |  51 ++--
>  drivers/mtd/nand/brcmnand/brcmnand.c            | 258 ++++++++++-------
>  drivers/mtd/nand/cafe_nand.c                    |  44 ++-
>  drivers/mtd/nand/davinci_nand.c                 | 118 +++-----
>  drivers/mtd/nand/denali.c                       |  50 +++-
>  drivers/mtd/nand/diskonchip.c                   |  60 +++-
>  drivers/mtd/nand/docg4.c                        |  33 ++-
>  drivers/mtd/nand/fsl_elbc_nand.c                |  83 +++---
>  drivers/mtd/nand/fsl_ifc_nand.c                 | 244 +++++-----------
>  drivers/mtd/nand/fsmc_nand.c                    | 322 ++++++---------------
>  drivers/mtd/nand/gpmi-nand/gpmi-nand.c          |  61 ++--
>  drivers/mtd/nand/hisi504_nand.c                 |  26 +-
>  drivers/mtd/nand/jz4740_nand.c                  |   2 +-
>  drivers/mtd/nand/jz4780_nand.c                  |  19 +-
>  drivers/mtd/nand/lpc32xx_mlc.c                  |  50 ++--
>  drivers/mtd/nand/lpc32xx_slc.c                  |  58 +++-
>  drivers/mtd/nand/mxc_nand.c                     | 212 +++++++-------
>  drivers/mtd/nand/nand_base.c                    | 340 +++++++++++-----------
>  drivers/mtd/nand/nand_bch.c                     |  27 +-
>  drivers/mtd/nand/omap2.c                        | 217 ++++++++------
>  drivers/mtd/nand/pxa3xx_nand.c                  | 104 ++++---
>  drivers/mtd/nand/qcom_nandc.c                   |  87 +++---
>  drivers/mtd/nand/s3c2410.c                      |  32 ++-
>  drivers/mtd/nand/sh_flctl.c                     |  87 ++++--
>  drivers/mtd/nand/sharpsl.c                      |   2 +-
>  drivers/mtd/nand/sm_common.c                    |  93 ++++--
>  drivers/mtd/nand/sunxi_nand.c                   | 114 ++++----
>  drivers/mtd/nand/vf610_nfc.c                    |  34 +--
>  drivers/mtd/onenand/onenand_base.c              | 235 ++++++++--------
>  drivers/staging/mt29f_spinand/mt29f_spinand.c   |  48 ++--
>  include/linux/mtd/fsmc.h                        |  18 --
>  include/linux/mtd/mtd.h                         |  63 ++++-
>  include/linux/mtd/nand.h                        |   5 +-
>  include/linux/mtd/onenand.h                     |   2 -
>  include/linux/mtd/sharpsl.h                     |   2 +-
>  include/uapi/mtd/mtd-abi.h                      |   2 +-
>  45 files changed, 2340 insertions(+), 1691 deletions(-)
> 



-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

Re: [PATCH v5 21/50] mtd: nand: jz4740: switch to mtd_ooblayout_ops

[Lars-Peter Clausen]

On 03/30/2016 06:14 PM, Boris Brezillon wrote:
> Implementing the mtd_ooblayout_ops interface is the new way of exposing
> ECC/OOB layout to MTD users.
>
> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>

Re: [PATCH v5 21/50] mtd: nand: jz4740: switch to mtd_ooblayout_ops

[Lars-Peter Clausen]

On 03/30/2016 06:14 PM, Boris Brezillon wrote:
> Implementing the mtd_ooblayout_ops interface is the new way of exposing
> ECC/OOB layout to MTD users.
>
> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>

[PATCH v5 21/50] mtd: nand: jz4740: switch to mtd_ooblayout_ops

[Lars-Peter Clausen]

On 03/30/2016 06:14 PM, Boris Brezillon wrote:
> Implementing the mtd_ooblayout_ops interface is the new way of exposing
> ECC/OOB layout to MTD users.
>
> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>

Re: [PATCH v5 45/50] mtd: nand: vf610: switch to mtd_ooblayout_ops

[Stefan Agner]

On 2016-03-30 09:15, Boris Brezillon wrote:
> Implementing the mtd_ooblayout_ops interface is the new way of exposing
> ECC/OOB layout to MTD users.

I think I sent this already in the last revision:

Tested-by: Stefan Agner <stefan@agner.ch>
Acked-by: Stefan Agner <stefan@agner.ch>

--
Stefan

> 
> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
> ---
>  drivers/mtd/nand/vf610_nfc.c | 34 ++++------------------------------
>  1 file changed, 4 insertions(+), 30 deletions(-)
> 
> diff --git a/drivers/mtd/nand/vf610_nfc.c b/drivers/mtd/nand/vf610_nfc.c
> index 293feb1..da34de1 100644
> --- a/drivers/mtd/nand/vf610_nfc.c
> +++ b/drivers/mtd/nand/vf610_nfc.c
> @@ -175,34 +175,6 @@ static inline struct vf610_nfc *mtd_to_nfc(struct
> mtd_info *mtd)
>  	return container_of(mtd_to_nand(mtd), struct vf610_nfc, chip);
>  }
>  
> -static struct nand_ecclayout vf610_nfc_ecc45 = {
> -	.eccbytes = 45,
> -	.eccpos = {19, 20, 21, 22, 23,
> -		   24, 25, 26, 27, 28, 29, 30, 31,
> -		   32, 33, 34, 35, 36, 37, 38, 39,
> -		   40, 41, 42, 43, 44, 45, 46, 47,
> -		   48, 49, 50, 51, 52, 53, 54, 55,
> -		   56, 57, 58, 59, 60, 61, 62, 63},
> -	.oobfree = {
> -		{.offset = 2,
> -		 .length = 17} }
> -};
> -
> -static struct nand_ecclayout vf610_nfc_ecc60 = {
> -	.eccbytes = 60,
> -	.eccpos = { 4,  5,  6,  7,  8,  9, 10, 11,
> -		   12, 13, 14, 15, 16, 17, 18, 19,
> -		   20, 21, 22, 23, 24, 25, 26, 27,
> -		   28, 29, 30, 31, 32, 33, 34, 35,
> -		   36, 37, 38, 39, 40, 41, 42, 43,
> -		   44, 45, 46, 47, 48, 49, 50, 51,
> -		   52, 53, 54, 55, 56, 57, 58, 59,
> -		   60, 61, 62, 63 },
> -	.oobfree = {
> -		{.offset = 2,
> -		 .length = 2} }
> -};
> -
>  static inline u32 vf610_nfc_read(struct vf610_nfc *nfc, uint reg)
>  {
>  	return readl(nfc->regs + reg);
> @@ -781,14 +753,16 @@ static int vf610_nfc_probe(struct platform_device *pdev)
>  		if (mtd->oobsize > 64)
>  			mtd->oobsize = 64;
>  
> +		/*
> +		 * mtd->ecclayout is not specified here because we're using the
> +		 * default large page ECC layout defined in NAND core.
> +		 */
>  		if (chip->ecc.strength == 32) {
>  			nfc->ecc_mode = ECC_60_BYTE;
>  			chip->ecc.bytes = 60;
> -			chip->ecc.layout = &vf610_nfc_ecc60;
>  		} else if (chip->ecc.strength == 24) {
>  			nfc->ecc_mode = ECC_45_BYTE;
>  			chip->ecc.bytes = 45;
> -			chip->ecc.layout = &vf610_nfc_ecc45;
>  		} else {
>  			dev_err(nfc->dev, "Unsupported ECC strength\n");
>  			err = -ENXIO;

Re: [PATCH v5 45/50] mtd: nand: vf610: switch to mtd_ooblayout_ops

[Stefan Agner]

On 2016-03-30 09:15, Boris Brezillon wrote:
> Implementing the mtd_ooblayout_ops interface is the new way of exposing
> ECC/OOB layout to MTD users.

I think I sent this already in the last revision:

Tested-by: Stefan Agner <stefan-XLVq0VzYD2Y@public.gmane.org>
Acked-by: Stefan Agner <stefan-XLVq0VzYD2Y@public.gmane.org>

--
Stefan

> 
> Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
> ---
>  drivers/mtd/nand/vf610_nfc.c | 34 ++++------------------------------
>  1 file changed, 4 insertions(+), 30 deletions(-)
> 
> diff --git a/drivers/mtd/nand/vf610_nfc.c b/drivers/mtd/nand/vf610_nfc.c
> index 293feb1..da34de1 100644
> --- a/drivers/mtd/nand/vf610_nfc.c
> +++ b/drivers/mtd/nand/vf610_nfc.c
> @@ -175,34 +175,6 @@ static inline struct vf610_nfc *mtd_to_nfc(struct
> mtd_info *mtd)
>  	return container_of(mtd_to_nand(mtd), struct vf610_nfc, chip);
>  }
>  
> -static struct nand_ecclayout vf610_nfc_ecc45 = {
> -	.eccbytes = 45,
> -	.eccpos = {19, 20, 21, 22, 23,
> -		   24, 25, 26, 27, 28, 29, 30, 31,
> -		   32, 33, 34, 35, 36, 37, 38, 39,
> -		   40, 41, 42, 43, 44, 45, 46, 47,
> -		   48, 49, 50, 51, 52, 53, 54, 55,
> -		   56, 57, 58, 59, 60, 61, 62, 63},
> -	.oobfree = {
> -		{.offset = 2,
> -		 .length = 17} }
> -};
> -
> -static struct nand_ecclayout vf610_nfc_ecc60 = {
> -	.eccbytes = 60,
> -	.eccpos = { 4,  5,  6,  7,  8,  9, 10, 11,
> -		   12, 13, 14, 15, 16, 17, 18, 19,
> -		   20, 21, 22, 23, 24, 25, 26, 27,
> -		   28, 29, 30, 31, 32, 33, 34, 35,
> -		   36, 37, 38, 39, 40, 41, 42, 43,
> -		   44, 45, 46, 47, 48, 49, 50, 51,
> -		   52, 53, 54, 55, 56, 57, 58, 59,
> -		   60, 61, 62, 63 },
> -	.oobfree = {
> -		{.offset = 2,
> -		 .length = 2} }
> -};
> -
>  static inline u32 vf610_nfc_read(struct vf610_nfc *nfc, uint reg)
>  {
>  	return readl(nfc->regs + reg);
> @@ -781,14 +753,16 @@ static int vf610_nfc_probe(struct platform_device *pdev)
>  		if (mtd->oobsize > 64)
>  			mtd->oobsize = 64;
>  
> +		/*
> +		 * mtd->ecclayout is not specified here because we're using the
> +		 * default large page ECC layout defined in NAND core.
> +		 */
>  		if (chip->ecc.strength == 32) {
>  			nfc->ecc_mode = ECC_60_BYTE;
>  			chip->ecc.bytes = 60;
> -			chip->ecc.layout = &vf610_nfc_ecc60;
>  		} else if (chip->ecc.strength == 24) {
>  			nfc->ecc_mode = ECC_45_BYTE;
>  			chip->ecc.bytes = 45;
> -			chip->ecc.layout = &vf610_nfc_ecc45;
>  		} else {
>  			dev_err(nfc->dev, "Unsupported ECC strength\n");
>  			err = -ENXIO;

[PATCH v5 45/50] mtd: nand: vf610: switch to mtd_ooblayout_ops

[Stefan Agner]

On 2016-03-30 09:15, Boris Brezillon wrote:
> Implementing the mtd_ooblayout_ops interface is the new way of exposing
> ECC/OOB layout to MTD users.

I think I sent this already in the last revision:

Tested-by: Stefan Agner <stefan@agner.ch>
Acked-by: Stefan Agner <stefan@agner.ch>

--
Stefan

> 
> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
> ---
>  drivers/mtd/nand/vf610_nfc.c | 34 ++++------------------------------
>  1 file changed, 4 insertions(+), 30 deletions(-)
> 
> diff --git a/drivers/mtd/nand/vf610_nfc.c b/drivers/mtd/nand/vf610_nfc.c
> index 293feb1..da34de1 100644
> --- a/drivers/mtd/nand/vf610_nfc.c
> +++ b/drivers/mtd/nand/vf610_nfc.c
> @@ -175,34 +175,6 @@ static inline struct vf610_nfc *mtd_to_nfc(struct
> mtd_info *mtd)
>  	return container_of(mtd_to_nand(mtd), struct vf610_nfc, chip);
>  }
>  
> -static struct nand_ecclayout vf610_nfc_ecc45 = {
> -	.eccbytes = 45,
> -	.eccpos = {19, 20, 21, 22, 23,
> -		   24, 25, 26, 27, 28, 29, 30, 31,
> -		   32, 33, 34, 35, 36, 37, 38, 39,
> -		   40, 41, 42, 43, 44, 45, 46, 47,
> -		   48, 49, 50, 51, 52, 53, 54, 55,
> -		   56, 57, 58, 59, 60, 61, 62, 63},
> -	.oobfree = {
> -		{.offset = 2,
> -		 .length = 17} }
> -};
> -
> -static struct nand_ecclayout vf610_nfc_ecc60 = {
> -	.eccbytes = 60,
> -	.eccpos = { 4,  5,  6,  7,  8,  9, 10, 11,
> -		   12, 13, 14, 15, 16, 17, 18, 19,
> -		   20, 21, 22, 23, 24, 25, 26, 27,
> -		   28, 29, 30, 31, 32, 33, 34, 35,
> -		   36, 37, 38, 39, 40, 41, 42, 43,
> -		   44, 45, 46, 47, 48, 49, 50, 51,
> -		   52, 53, 54, 55, 56, 57, 58, 59,
> -		   60, 61, 62, 63 },
> -	.oobfree = {
> -		{.offset = 2,
> -		 .length = 2} }
> -};
> -
>  static inline u32 vf610_nfc_read(struct vf610_nfc *nfc, uint reg)
>  {
>  	return readl(nfc->regs + reg);
> @@ -781,14 +753,16 @@ static int vf610_nfc_probe(struct platform_device *pdev)
>  		if (mtd->oobsize > 64)
>  			mtd->oobsize = 64;
>  
> +		/*
> +		 * mtd->ecclayout is not specified here because we're using the
> +		 * default large page ECC layout defined in NAND core.
> +		 */
>  		if (chip->ecc.strength == 32) {
>  			nfc->ecc_mode = ECC_60_BYTE;
>  			chip->ecc.bytes = 60;
> -			chip->ecc.layout = &vf610_nfc_ecc60;
>  		} else if (chip->ecc.strength == 24) {
>  			nfc->ecc_mode = ECC_45_BYTE;
>  			chip->ecc.bytes = 45;
> -			chip->ecc.layout = &vf610_nfc_ecc45;
>  		} else {
>  			dev_err(nfc->dev, "Unsupported ECC strength\n");
>  			err = -ENXIO;

Re: [PATCH v5 34/50] mtd: nand: gpmi: switch to mtd_ooblayout_ops

[Han Xu]

[-- Attachment #1: Type: text/plain, Size: 5919 bytes --]




________________________________
From: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
Sent: Wednesday, March 30, 2016 10:14 AM
To: David Woodhouse; Brian Norris; linux-mtd-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org; Boris Brezillon; Richard Weinberger
Cc: Daniel Mack; Haojian Zhuang; Robert Jarzmik; Kukjin Kim; Krzysztof Kozlowski; linux-samsung-soc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org; linux-arm-kernel-IAPFreCvJWM7uuMidbF8XQ@public.gmane.orgorg; Ralf Baechle; linux-mips-6z/3iImG2C8G8FEW9MqTrA@public.gmane.org; Nicolas Ferre; Jean-Christophe Plagniol-Villard; Alexandre Belloni; Wenyou Yang; Josh Wu; Ezequiel Garcia; Maxime Ripard; Chen-Yu Tsai; linux-sunxi-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org; Stefan Agner; Kyungmin Park; Greg Kroah-Hartman; devel-gWbeCf7V1WCQmaza687I9mD2FQJk+8+b@public.gmane.org; linux-kernel@vger.kernel.org; punnaiah choudary kalluri; Priit Laes; Kamal Dasu; bcm-kernel-feedback-list-dY08KVG/lbpWk0Htik3J/w@public.gmane.org; linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org; Harvey Hunt; Archit Taneja; b45815-KZfg59tc24xl57MIdRCFDg@public.gmane.org; Huang Shijie
Subject: [PATCH v5 34/50] mtd: nand: gpmi: switch to mtd_ooblayout_ops

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/mtd/nand/gpmi-nand/gpmi-nand.c | 52 ++++++++++++++++++++++++++--------
 1 file changed, 40 insertions(+), 12 deletions(-)

diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
index 3a29b65..316b5ac 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
@@ -47,10 +47,44 @@ static struct nand_bbt_descr gpmi_bbt_descr = {
  * We may change the layout if we can get the ECC info from the datasheet,
  * else we will use all the (page + OOB).
  */
-static struct nand_ecclayout gpmi_hw_ecclayout = {
-       .eccbytes = 0,
-       .eccpos = { 0, },
-       .oobfree = { {.offset = 0, .length = 0} }
+static int gpmi_ooblayout_ecc(struct mtd_info *mtd, int section,
+                             struct mtd_oob_region *oobregion)
+{
+       struct nand_chip *chip = mtd_to_nand(mtd);
+       struct gpmi_nand_data *this = nand_get_controller_data(chip);
+       struct bch_geometry *geo = &this->bch_geometry;
+
+       if (section)
+               return -ERANGE;
+
+       oobregion->offset = 0;
+       oobregion->length = geo->page_size - mtd->writesize;
+
+       return 0;
+}
+
+static int gpmi_ooblayout_free(struct mtd_info *mtd, int section,
+                              struct mtd_oob_region *oobregion)
+{
+       struct nand_chip *chip = mtd_to_nand(mtd);
+       struct gpmi_nand_data *this = nand_get_controller_data(chip);
+       struct bch_geometry *geo = &this->bch_geometry;
+
+       if (section)
+               return -ERANGE;
+
+       /* The available oob size we have. */
+       if (geo->page_size < mtd->writesize + mtd->oobsize) {
+               oobregion->offset = geo->page_size - mtd->writesize;
+               oobregion->length = mtd->oobsize - oobregion->offset;
+       }
+
+       return 0;
+}
+
+static const struct mtd_ooblayout_ops gpmi_ooblayout_ops = {
+       .ecc = gpmi_ooblayout_ecc,
+       .free = gpmi_ooblayout_free,
 };

 static const struct gpmi_devdata gpmi_devdata_imx23 = {
@@ -141,7 +175,6 @@ static int set_geometry_by_ecc_info(struct gpmi_nand_data *this)
         struct bch_geometry *geo = &this->bch_geometry;
         struct nand_chip *chip = &this->nand;
         struct mtd_info *mtd = nand_to_mtd(chip);
-       struct nand_oobfree *of = gpmi_hw_ecclayout.oobfree;
         unsigned int block_mark_bit_offset;

         if (!(chip->ecc_strength_ds > 0 && chip->ecc_step_ds > 0))
@@ -229,12 +262,6 @@ static int set_geometry_by_ecc_info(struct gpmi_nand_data *this)
         geo->page_size = mtd->writesize + geo->metadata_size +
                 (geo->gf_len * geo->ecc_strength * geo->ecc_chunk_count) / 8;

-       /* The available oob size we have. */
-       if (geo->page_size < mtd->writesize + mtd->oobsize) {
-               of->offset = geo->page_size - mtd->writesize;
-               of->length = mtd->oobsize - of->offset;
-       }
-
         geo->payload_size = mtd->writesize;

         geo->auxiliary_status_offset = ALIGN(geo->metadata_size, 4);
@@ -1841,6 +1868,7 @@ static void gpmi_nand_exit(struct gpmi_nand_data *this)
 static int gpmi_init_last(struct gpmi_nand_data *this)
 {
         struct nand_chip *chip = &this->nand;
+       struct mtd_info *mtd = nand_to_mtd(chip);
         struct nand_ecc_ctrl *ecc = &chip->ecc;
         struct bch_geometry *bch_geo = &this->bch_geometry;
         int ret;
@@ -1862,7 +1890,7 @@ static int gpmi_init_last(struct gpmi_nand_data *this)
         ecc->mode       = NAND_ECC_HW;
         ecc->size       = bch_geo->ecc_chunk_size;
         ecc->strength   = bch_geo->ecc_strength;
-       ecc->layout     = &gpmi_hw_ecclayout;
+       mtd_set_ooblayout(mtd, &gpmi_ooblayout_ops);

         /*
          * We only enable the subpage read when:

I am fine with all gpmi patch set and tested on i.MX6Q, just found another issue in gpmi driver.
The patch was sent, refer to https://patchwork.ozlabs.org/patch/609755/


Acked-by: Han Xu <han.xu-3arQi8VN3Tc@public.gmane.org>
Tested-by: Han Xu <han.xu-3arQi8VN3Tc@public.gmane.org>
--
2.5.0

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[-- Attachment #2: Type: text/html, Size: 11017 bytes --]

Re: [PATCH v5 34/50] mtd: nand: gpmi: switch to mtd_ooblayout_ops

[Boris Brezillon]

On Tue, 12 Apr 2016 22:27:58 +0000
Han Xu <han.xu@nxp.com> wrote:

> 
> I am fine with all gpmi patch set and tested on i.MX6Q, just found another issue in gpmi driver.
> The patch was sent, refer to https://patchwork.ozlabs.org/patch/609755/

Oh, was it related to the changes introduced by this series?

> 
> 
> Acked-by: Han Xu <han.xu@nxp.com>
> Tested-by: Han Xu <han.xu@nxp.com>
> --
> 2.5.0
> 



-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

Re: [PATCH v5 34/50] mtd: nand: gpmi: switch to mtd_ooblayout_ops

[Boris Brezillon]

On Tue, 12 Apr 2016 22:27:58 +0000
Han Xu <han.xu-3arQi8VN3Tc@public.gmane.org> wrote:

> 
> I am fine with all gpmi patch set and tested on i.MX6Q, just found another issue in gpmi driver.
> The patch was sent, refer to https://patchwork.ozlabs.org/patch/609755/

Oh, was it related to the changes introduced by this series?

> 
> 
> Acked-by: Han Xu <han.xu-3arQi8VN3Tc@public.gmane.org>
> Tested-by: Han Xu <han.xu-3arQi8VN3Tc@public.gmane.org>
> --
> 2.5.0
> 



-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

Re: [PATCH v5 34/50] mtd: nand: gpmi: switch to mtd_ooblayout_ops

[Boris Brezillon]

On Tue, 12 Apr 2016 22:27:58 +0000
Han Xu <han.xu@nxp.com> wrote:

> 
> I am fine with all gpmi patch set and tested on i.MX6Q, just found another issue in gpmi driver.
> The patch was sent, refer to https://patchwork.ozlabs.org/patch/609755/

Oh, was it related to the changes introduced by this series?

> 
> 
> Acked-by: Han Xu <han.xu@nxp.com>
> Tested-by: Han Xu <han.xu@nxp.com>
> --
> 2.5.0
> 



-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

[PATCH v5 34/50] mtd: nand: gpmi: switch to mtd_ooblayout_ops

[Boris Brezillon]

On Tue, 12 Apr 2016 22:27:58 +0000
Han Xu <han.xu@nxp.com> wrote:

> 
> I am fine with all gpmi patch set and tested on i.MX6Q, just found another issue in gpmi driver.
> The patch was sent, refer to https://patchwork.ozlabs.org/patch/609755/

Oh, was it related to the changes introduced by this series?

> 
> 
> Acked-by: Han Xu <han.xu@nxp.com>
> Tested-by: Han Xu <han.xu@nxp.com>
> --
> 2.5.0
> 



-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

Re: [PATCH v5 34/50] mtd: nand: gpmi: switch to mtd_ooblayout_ops

[Han Xu]

[-- Attachment #1: Type: text/plain, Size: 2285 bytes --]




________________________________
From: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
Sent: Tuesday, April 12, 2016 4:31 PM
To: Han Xu
Cc: David Woodhouse; Brian Norris; linux-mtd-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org; Richard Weinberger; Daniel Mack; Haojian Zhuang; Robert Jarzmik; Kukjin Kim; Krzysztof Kozlowski; linux-samsung-soc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org; linux-arm-kernel-IAPFreCvJWMP3drIcvDWNA@public.gmane.orgradead.org; Ralf Baechle; linux-mips-6z/3iImG2C8G8FEW9MqTrA@public.gmane.org; Nicolas Ferre; Jean-Christophe Plagniol-Villard; Alexandre Belloni; Wenyou Yang; Josh Wu; Ezequiel Garcia; Maxime Ripard; Chen-Yu Tsai; linux-sunxi-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org; Stefan Agner; Kyungmin Park; Greg Kroah-Hartman; devel-gWbeCf7V1WCQmaza687I9mD2FQJk+8+b@public.gmane.org; linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org; punnaiah choudary kalluri; Priit Laes; Kamal Dasu; bcm-kernel-feedback-list-dY08KVG/lbpWk0Htik3J/w@public.gmane.org; linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org; Harvey Hunt; Archit Taneja; b45815-KZfg59tc24xl57MIdRCFDg@public.gmane.org; Huang Shijie
Subject: Re: [PATCH v5 34/50] mtd: nand: gpmi: switch to mtd_ooblayout_ops

On Tue, 12 Apr 2016 22:27:58 +0000
Han Xu <han.xu-3arQi8VN3Tc@public.gmane.org> wrote:

>
> I am fine with all gpmi patch set and tested on i.MX6Q, just found another issue in gpmi driver.
> The patch was sent, refer to https://patchwork.ozlabs.org/patch/609755/

Oh, was it related to the changes introduced by this series?

No, previous code used all page space so I couldn't test your change, I changed the code to get
correct free oob space.

>
>
> Acked-by: Han Xu <han.xu-3arQi8VN3Tc@public.gmane.org>
> Tested-by: Han Xu <han.xu-3arQi8VN3Tc@public.gmane.org>
> --
> 2.5.0
>



--
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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Re: [PATCH v5 04/50] mtd: nand: atmel: use mtd_ooblayout_xxx() helpers where appropriate

[Boris Brezillon]

On Wed, 30 Mar 2016 18:14:19 +0200
Boris Brezillon <boris.brezillon@free-electrons.com> wrote:

> The mtd_ooblayout_xxx() helper functions have been added to avoid direct
> accesses to the ecclayout field, and thus ease for future reworks.
> Use these helpers in all places where the oobfree[] and eccpos[] arrays
> where directly accessed.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>

Tested with mtd_oobtest.ko on sama5d4ek.

Tested-by: Boris Brezillon <boris.brezillon@free-electrons.com>

> ---
>  drivers/mtd/nand/atmel_nand.c | 48 ++++++++++++++++++++++++++-----------------
>  1 file changed, 29 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
> index 0b5da72..321d331 100644
> --- a/drivers/mtd/nand/atmel_nand.c
> +++ b/drivers/mtd/nand/atmel_nand.c
> @@ -836,13 +836,16 @@ static void pmecc_correct_data(struct mtd_info *mtd, uint8_t *buf, uint8_t *ecc,
>  			dev_dbg(host->dev, "Bit flip in data area, byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
>  				pos, bit_pos, err_byte, *(buf + byte_pos));
>  		} else {
> +			struct mtd_oob_region oobregion;
> +
>  			/* Bit flip in OOB area */
>  			tmp = sector_num * nand_chip->ecc.bytes
>  					+ (byte_pos - sector_size);
>  			err_byte = ecc[tmp];
>  			ecc[tmp] ^= (1 << bit_pos);
>  
> -			pos = tmp + nand_chip->ecc.layout->eccpos[0];
> +			mtd_ooblayout_ecc(mtd, 0, &oobregion);
> +			pos = tmp + oobregion.offset;
>  			dev_dbg(host->dev, "Bit flip in OOB, oob_byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
>  				pos, bit_pos, err_byte, ecc[tmp]);
>  		}
> @@ -934,7 +937,6 @@ static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
>  	struct atmel_nand_host *host = nand_get_controller_data(chip);
>  	int eccsize = chip->ecc.size * chip->ecc.steps;
>  	uint8_t *oob = chip->oob_poi;
> -	uint32_t *eccpos = chip->ecc.layout->eccpos;
>  	uint32_t stat;
>  	unsigned long end_time;
>  	int bitflips = 0;
> @@ -956,7 +958,11 @@ static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
>  
>  	stat = pmecc_readl_relaxed(host->ecc, ISR);
>  	if (stat != 0) {
> -		bitflips = pmecc_correction(mtd, stat, buf, &oob[eccpos[0]]);
> +		struct mtd_oob_region oobregion;
> +
> +		mtd_ooblayout_ecc(mtd, 0, &oobregion);
> +		bitflips = pmecc_correction(mtd, stat, buf,
> +					    &oob[oobregion.offset]);
>  		if (bitflips < 0)
>  			/* uncorrectable errors */
>  			return 0;
> @@ -970,8 +976,8 @@ static int atmel_nand_pmecc_write_page(struct mtd_info *mtd,
>  		int page)
>  {
>  	struct atmel_nand_host *host = nand_get_controller_data(chip);
> -	uint32_t *eccpos = chip->ecc.layout->eccpos;
> -	int i, j;
> +	struct mtd_oob_region oobregion = { };
> +	int i, j, section = 0;
>  	unsigned long end_time;
>  
>  	if (!host->nfc || !host->nfc->write_by_sram) {
> @@ -990,11 +996,12 @@ static int atmel_nand_pmecc_write_page(struct mtd_info *mtd,
>  
>  	for (i = 0; i < chip->ecc.steps; i++) {
>  		for (j = 0; j < chip->ecc.bytes; j++) {
> -			int pos;
> +			if (!oobregion.length)
> +				mtd_ooblayout_ecc(mtd, section++, &oobregion);
>  
> -			pos = i * chip->ecc.bytes + j;
> -			chip->oob_poi[eccpos[pos]] =
> +			chip->oob_poi[oobregion.offset++] =
>  				pmecc_readb_ecc_relaxed(host->ecc, i, j);
> +			oobregion.length--;
>  		}
>  	}
>  	chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
> @@ -1008,6 +1015,7 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
>  	struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
>  	uint32_t val = 0;
>  	struct nand_ecclayout *ecc_layout;
> +	struct mtd_oob_region oobregion;
>  
>  	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST);
>  	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DISABLE);
> @@ -1059,9 +1067,10 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
>  
>  	ecc_layout = nand_chip->ecc.layout;
>  	pmecc_writel(host->ecc, SAREA, mtd->oobsize - 1);
> -	pmecc_writel(host->ecc, SADDR, ecc_layout->eccpos[0]);
> +	mtd_ooblayout_ecc(mtd, 0, &oobregion);
> +	pmecc_writel(host->ecc, SADDR, oobregion.offset);
>  	pmecc_writel(host->ecc, EADDR,
> -			ecc_layout->eccpos[ecc_layout->eccbytes - 1]);
> +		     oobregion.offset + ecc_layout->eccbytes - 1);
>  	/* See datasheet about PMECC Clock Control Register */
>  	pmecc_writel(host->ecc, CLK, 2);
>  	pmecc_writel(host->ecc, IDR, 0xff);
> @@ -1362,12 +1371,12 @@ static int atmel_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
>  {
>  	int eccsize = chip->ecc.size;
>  	int eccbytes = chip->ecc.bytes;
> -	uint32_t *eccpos = chip->ecc.layout->eccpos;
>  	uint8_t *p = buf;
>  	uint8_t *oob = chip->oob_poi;
>  	uint8_t *ecc_pos;
>  	int stat;
>  	unsigned int max_bitflips = 0;
> +	struct mtd_oob_region oobregion = {};
>  
>  	/*
>  	 * Errata: ALE is incorrectly wired up to the ECC controller
> @@ -1385,19 +1394,20 @@ static int atmel_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
>  	chip->read_buf(mtd, p, eccsize);
>  
>  	/* move to ECC position if needed */
> -	if (eccpos[0] != 0) {
> -		/* This only works on large pages
> -		 * because the ECC controller waits for
> -		 * NAND_CMD_RNDOUTSTART after the
> -		 * NAND_CMD_RNDOUT.
> -		 * anyway, for small pages, the eccpos[0] == 0
> +	mtd_ooblayout_ecc(mtd, 0, &oobregion);
> +	if (oobregion.offset != 0) {
> +		/*
> +		 * This only works on large pages because the ECC controller
> +		 * waits for NAND_CMD_RNDOUTSTART after the NAND_CMD_RNDOUT.
> +		 * Anyway, for small pages, the first ECC byte is at offset
> +		 * 0 in the OOB area.
>  		 */
>  		chip->cmdfunc(mtd, NAND_CMD_RNDOUT,
> -				mtd->writesize + eccpos[0], -1);
> +			      mtd->writesize + oobregion.offset, -1);
>  	}
>  
>  	/* the ECC controller needs to read the ECC just after the data */
> -	ecc_pos = oob + eccpos[0];
> +	ecc_pos = oob + oobregion.offset;
>  	chip->read_buf(mtd, ecc_pos, eccbytes);
>  
>  	/* check if there's an error */



-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

Re: [PATCH v5 04/50] mtd: nand: atmel: use mtd_ooblayout_xxx() helpers where appropriate

[Boris Brezillon]

On Wed, 30 Mar 2016 18:14:19 +0200
Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org> wrote:

> The mtd_ooblayout_xxx() helper functions have been added to avoid direct
> accesses to the ecclayout field, and thus ease for future reworks.
> Use these helpers in all places where the oobfree[] and eccpos[] arrays
> where directly accessed.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>

Tested with mtd_oobtest.ko on sama5d4ek.

Tested-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>

> ---
>  drivers/mtd/nand/atmel_nand.c | 48 ++++++++++++++++++++++++++-----------------
>  1 file changed, 29 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
> index 0b5da72..321d331 100644
> --- a/drivers/mtd/nand/atmel_nand.c
> +++ b/drivers/mtd/nand/atmel_nand.c
> @@ -836,13 +836,16 @@ static void pmecc_correct_data(struct mtd_info *mtd, uint8_t *buf, uint8_t *ecc,
>  			dev_dbg(host->dev, "Bit flip in data area, byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
>  				pos, bit_pos, err_byte, *(buf + byte_pos));
>  		} else {
> +			struct mtd_oob_region oobregion;
> +
>  			/* Bit flip in OOB area */
>  			tmp = sector_num * nand_chip->ecc.bytes
>  					+ (byte_pos - sector_size);
>  			err_byte = ecc[tmp];
>  			ecc[tmp] ^= (1 << bit_pos);
>  
> -			pos = tmp + nand_chip->ecc.layout->eccpos[0];
> +			mtd_ooblayout_ecc(mtd, 0, &oobregion);
> +			pos = tmp + oobregion.offset;
>  			dev_dbg(host->dev, "Bit flip in OOB, oob_byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
>  				pos, bit_pos, err_byte, ecc[tmp]);
>  		}
> @@ -934,7 +937,6 @@ static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
>  	struct atmel_nand_host *host = nand_get_controller_data(chip);
>  	int eccsize = chip->ecc.size * chip->ecc.steps;
>  	uint8_t *oob = chip->oob_poi;
> -	uint32_t *eccpos = chip->ecc.layout->eccpos;
>  	uint32_t stat;
>  	unsigned long end_time;
>  	int bitflips = 0;
> @@ -956,7 +958,11 @@ static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
>  
>  	stat = pmecc_readl_relaxed(host->ecc, ISR);
>  	if (stat != 0) {
> -		bitflips = pmecc_correction(mtd, stat, buf, &oob[eccpos[0]]);
> +		struct mtd_oob_region oobregion;
> +
> +		mtd_ooblayout_ecc(mtd, 0, &oobregion);
> +		bitflips = pmecc_correction(mtd, stat, buf,
> +					    &oob[oobregion.offset]);
>  		if (bitflips < 0)
>  			/* uncorrectable errors */
>  			return 0;
> @@ -970,8 +976,8 @@ static int atmel_nand_pmecc_write_page(struct mtd_info *mtd,
>  		int page)
>  {
>  	struct atmel_nand_host *host = nand_get_controller_data(chip);
> -	uint32_t *eccpos = chip->ecc.layout->eccpos;
> -	int i, j;
> +	struct mtd_oob_region oobregion = { };
> +	int i, j, section = 0;
>  	unsigned long end_time;
>  
>  	if (!host->nfc || !host->nfc->write_by_sram) {
> @@ -990,11 +996,12 @@ static int atmel_nand_pmecc_write_page(struct mtd_info *mtd,
>  
>  	for (i = 0; i < chip->ecc.steps; i++) {
>  		for (j = 0; j < chip->ecc.bytes; j++) {
> -			int pos;
> +			if (!oobregion.length)
> +				mtd_ooblayout_ecc(mtd, section++, &oobregion);
>  
> -			pos = i * chip->ecc.bytes + j;
> -			chip->oob_poi[eccpos[pos]] =
> +			chip->oob_poi[oobregion.offset++] =
>  				pmecc_readb_ecc_relaxed(host->ecc, i, j);
> +			oobregion.length--;
>  		}
>  	}
>  	chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
> @@ -1008,6 +1015,7 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
>  	struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
>  	uint32_t val = 0;
>  	struct nand_ecclayout *ecc_layout;
> +	struct mtd_oob_region oobregion;
>  
>  	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST);
>  	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DISABLE);
> @@ -1059,9 +1067,10 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
>  
>  	ecc_layout = nand_chip->ecc.layout;
>  	pmecc_writel(host->ecc, SAREA, mtd->oobsize - 1);
> -	pmecc_writel(host->ecc, SADDR, ecc_layout->eccpos[0]);
> +	mtd_ooblayout_ecc(mtd, 0, &oobregion);
> +	pmecc_writel(host->ecc, SADDR, oobregion.offset);
>  	pmecc_writel(host->ecc, EADDR,
> -			ecc_layout->eccpos[ecc_layout->eccbytes - 1]);
> +		     oobregion.offset + ecc_layout->eccbytes - 1);
>  	/* See datasheet about PMECC Clock Control Register */
>  	pmecc_writel(host->ecc, CLK, 2);
>  	pmecc_writel(host->ecc, IDR, 0xff);
> @@ -1362,12 +1371,12 @@ static int atmel_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
>  {
>  	int eccsize = chip->ecc.size;
>  	int eccbytes = chip->ecc.bytes;
> -	uint32_t *eccpos = chip->ecc.layout->eccpos;
>  	uint8_t *p = buf;
>  	uint8_t *oob = chip->oob_poi;
>  	uint8_t *ecc_pos;
>  	int stat;
>  	unsigned int max_bitflips = 0;
> +	struct mtd_oob_region oobregion = {};
>  
>  	/*
>  	 * Errata: ALE is incorrectly wired up to the ECC controller
> @@ -1385,19 +1394,20 @@ static int atmel_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
>  	chip->read_buf(mtd, p, eccsize);
>  
>  	/* move to ECC position if needed */
> -	if (eccpos[0] != 0) {
> -		/* This only works on large pages
> -		 * because the ECC controller waits for
> -		 * NAND_CMD_RNDOUTSTART after the
> -		 * NAND_CMD_RNDOUT.
> -		 * anyway, for small pages, the eccpos[0] == 0
> +	mtd_ooblayout_ecc(mtd, 0, &oobregion);
> +	if (oobregion.offset != 0) {
> +		/*
> +		 * This only works on large pages because the ECC controller
> +		 * waits for NAND_CMD_RNDOUTSTART after the NAND_CMD_RNDOUT.
> +		 * Anyway, for small pages, the first ECC byte is at offset
> +		 * 0 in the OOB area.
>  		 */
>  		chip->cmdfunc(mtd, NAND_CMD_RNDOUT,
> -				mtd->writesize + eccpos[0], -1);
> +			      mtd->writesize + oobregion.offset, -1);
>  	}
>  
>  	/* the ECC controller needs to read the ECC just after the data */
> -	ecc_pos = oob + eccpos[0];
> +	ecc_pos = oob + oobregion.offset;
>  	chip->read_buf(mtd, ecc_pos, eccbytes);
>  
>  	/* check if there's an error */



-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

[PATCH v5 04/50] mtd: nand: atmel: use mtd_ooblayout_xxx() helpers where appropriate

[Boris Brezillon]

On Wed, 30 Mar 2016 18:14:19 +0200
Boris Brezillon <boris.brezillon@free-electrons.com> wrote:

> The mtd_ooblayout_xxx() helper functions have been added to avoid direct
> accesses to the ecclayout field, and thus ease for future reworks.
> Use these helpers in all places where the oobfree[] and eccpos[] arrays
> where directly accessed.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>

Tested with mtd_oobtest.ko on sama5d4ek.

Tested-by: Boris Brezillon <boris.brezillon@free-electrons.com>

> ---
>  drivers/mtd/nand/atmel_nand.c | 48 ++++++++++++++++++++++++++-----------------
>  1 file changed, 29 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
> index 0b5da72..321d331 100644
> --- a/drivers/mtd/nand/atmel_nand.c
> +++ b/drivers/mtd/nand/atmel_nand.c
> @@ -836,13 +836,16 @@ static void pmecc_correct_data(struct mtd_info *mtd, uint8_t *buf, uint8_t *ecc,
>  			dev_dbg(host->dev, "Bit flip in data area, byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
>  				pos, bit_pos, err_byte, *(buf + byte_pos));
>  		} else {
> +			struct mtd_oob_region oobregion;
> +
>  			/* Bit flip in OOB area */
>  			tmp = sector_num * nand_chip->ecc.bytes
>  					+ (byte_pos - sector_size);
>  			err_byte = ecc[tmp];
>  			ecc[tmp] ^= (1 << bit_pos);
>  
> -			pos = tmp + nand_chip->ecc.layout->eccpos[0];
> +			mtd_ooblayout_ecc(mtd, 0, &oobregion);
> +			pos = tmp + oobregion.offset;
>  			dev_dbg(host->dev, "Bit flip in OOB, oob_byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
>  				pos, bit_pos, err_byte, ecc[tmp]);
>  		}
> @@ -934,7 +937,6 @@ static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
>  	struct atmel_nand_host *host = nand_get_controller_data(chip);
>  	int eccsize = chip->ecc.size * chip->ecc.steps;
>  	uint8_t *oob = chip->oob_poi;
> -	uint32_t *eccpos = chip->ecc.layout->eccpos;
>  	uint32_t stat;
>  	unsigned long end_time;
>  	int bitflips = 0;
> @@ -956,7 +958,11 @@ static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
>  
>  	stat = pmecc_readl_relaxed(host->ecc, ISR);
>  	if (stat != 0) {
> -		bitflips = pmecc_correction(mtd, stat, buf, &oob[eccpos[0]]);
> +		struct mtd_oob_region oobregion;
> +
> +		mtd_ooblayout_ecc(mtd, 0, &oobregion);
> +		bitflips = pmecc_correction(mtd, stat, buf,
> +					    &oob[oobregion.offset]);
>  		if (bitflips < 0)
>  			/* uncorrectable errors */
>  			return 0;
> @@ -970,8 +976,8 @@ static int atmel_nand_pmecc_write_page(struct mtd_info *mtd,
>  		int page)
>  {
>  	struct atmel_nand_host *host = nand_get_controller_data(chip);
> -	uint32_t *eccpos = chip->ecc.layout->eccpos;
> -	int i, j;
> +	struct mtd_oob_region oobregion = { };
> +	int i, j, section = 0;
>  	unsigned long end_time;
>  
>  	if (!host->nfc || !host->nfc->write_by_sram) {
> @@ -990,11 +996,12 @@ static int atmel_nand_pmecc_write_page(struct mtd_info *mtd,
>  
>  	for (i = 0; i < chip->ecc.steps; i++) {
>  		for (j = 0; j < chip->ecc.bytes; j++) {
> -			int pos;
> +			if (!oobregion.length)
> +				mtd_ooblayout_ecc(mtd, section++, &oobregion);
>  
> -			pos = i * chip->ecc.bytes + j;
> -			chip->oob_poi[eccpos[pos]] =
> +			chip->oob_poi[oobregion.offset++] =
>  				pmecc_readb_ecc_relaxed(host->ecc, i, j);
> +			oobregion.length--;
>  		}
>  	}
>  	chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
> @@ -1008,6 +1015,7 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
>  	struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
>  	uint32_t val = 0;
>  	struct nand_ecclayout *ecc_layout;
> +	struct mtd_oob_region oobregion;
>  
>  	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST);
>  	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DISABLE);
> @@ -1059,9 +1067,10 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
>  
>  	ecc_layout = nand_chip->ecc.layout;
>  	pmecc_writel(host->ecc, SAREA, mtd->oobsize - 1);
> -	pmecc_writel(host->ecc, SADDR, ecc_layout->eccpos[0]);
> +	mtd_ooblayout_ecc(mtd, 0, &oobregion);
> +	pmecc_writel(host->ecc, SADDR, oobregion.offset);
>  	pmecc_writel(host->ecc, EADDR,
> -			ecc_layout->eccpos[ecc_layout->eccbytes - 1]);
> +		     oobregion.offset + ecc_layout->eccbytes - 1);
>  	/* See datasheet about PMECC Clock Control Register */
>  	pmecc_writel(host->ecc, CLK, 2);
>  	pmecc_writel(host->ecc, IDR, 0xff);
> @@ -1362,12 +1371,12 @@ static int atmel_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
>  {
>  	int eccsize = chip->ecc.size;
>  	int eccbytes = chip->ecc.bytes;
> -	uint32_t *eccpos = chip->ecc.layout->eccpos;
>  	uint8_t *p = buf;
>  	uint8_t *oob = chip->oob_poi;
>  	uint8_t *ecc_pos;
>  	int stat;
>  	unsigned int max_bitflips = 0;
> +	struct mtd_oob_region oobregion = {};
>  
>  	/*
>  	 * Errata: ALE is incorrectly wired up to the ECC controller
> @@ -1385,19 +1394,20 @@ static int atmel_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
>  	chip->read_buf(mtd, p, eccsize);
>  
>  	/* move to ECC position if needed */
> -	if (eccpos[0] != 0) {
> -		/* This only works on large pages
> -		 * because the ECC controller waits for
> -		 * NAND_CMD_RNDOUTSTART after the
> -		 * NAND_CMD_RNDOUT.
> -		 * anyway, for small pages, the eccpos[0] == 0
> +	mtd_ooblayout_ecc(mtd, 0, &oobregion);
> +	if (oobregion.offset != 0) {
> +		/*
> +		 * This only works on large pages because the ECC controller
> +		 * waits for NAND_CMD_RNDOUTSTART after the NAND_CMD_RNDOUT.
> +		 * Anyway, for small pages, the first ECC byte is at offset
> +		 * 0 in the OOB area.
>  		 */
>  		chip->cmdfunc(mtd, NAND_CMD_RNDOUT,
> -				mtd->writesize + eccpos[0], -1);
> +			      mtd->writesize + oobregion.offset, -1);
>  	}
>  
>  	/* the ECC controller needs to read the ECC just after the data */
> -	ecc_pos = oob + eccpos[0];
> +	ecc_pos = oob + oobregion.offset;
>  	chip->read_buf(mtd, ecc_pos, eccbytes);
>  
>  	/* check if there's an error */



-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

Re: [PATCH v5 22/50] mtd: nand: atmel: switch to mtd_ooblayout_ops

[Boris Brezillon]

On Wed, 30 Mar 2016 18:14:37 +0200
Boris Brezillon <boris.brezillon@free-electrons.com> wrote:

> Implementing the mtd_ooblayout_ops interface is the new way of exposing
> ECC/OOB layout to MTD users.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>

Tested with mtd_oobtest.ko on sama5d4ek.

Tested-by: Boris Brezillon <boris.brezillon@free-electrons.com>

> ---
>  drivers/mtd/nand/atmel_nand.c | 84 ++++++++++++++++++++-----------------------
>  1 file changed, 38 insertions(+), 46 deletions(-)
> 
> diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
> index 321d331..46a601e 100644
> --- a/drivers/mtd/nand/atmel_nand.c
> +++ b/drivers/mtd/nand/atmel_nand.c
> @@ -72,30 +72,44 @@ struct atmel_nand_nfc_caps {
>  	uint32_t rb_mask;
>  };
>  
> -/* oob layout for large page size
> +/*
> + * oob layout for large page size
>   * bad block info is on bytes 0 and 1
>   * the bytes have to be consecutives to avoid
>   * several NAND_CMD_RNDOUT during read
> - */
> -static struct nand_ecclayout atmel_oobinfo_large = {
> -	.eccbytes = 4,
> -	.eccpos = {60, 61, 62, 63},
> -	.oobfree = {
> -		{2, 58}
> -	},
> -};
> -
> -/* oob layout for small page size
> + *
> + * oob layout for small page size
>   * bad block info is on bytes 4 and 5
>   * the bytes have to be consecutives to avoid
>   * several NAND_CMD_RNDOUT during read
>   */
> -static struct nand_ecclayout atmel_oobinfo_small = {
> -	.eccbytes = 4,
> -	.eccpos = {0, 1, 2, 3},
> -	.oobfree = {
> -		{6, 10}
> -	},
> +static int atmel_ooblayout_ecc_sp(struct mtd_info *mtd, int section,
> +				  struct mtd_oob_region *oobregion)
> +{
> +	if (section)
> +		return -ERANGE;
> +
> +	oobregion->length = 4;
> +	oobregion->offset = 0;
> +
> +	return 0;
> +}
> +
> +static int atmel_ooblayout_free_sp(struct mtd_info *mtd, int section,
> +				   struct mtd_oob_region *oobregion)
> +{
> +	if (section)
> +		return -ERANGE;
> +
> +	oobregion->offset = 6;
> +	oobregion->length = mtd->oobsize - oobregion->offset;
> +
> +	return 0;
> +}
> +
> +static const struct mtd_ooblayout_ops atmel_ooblayout_sp_ops = {
> +	.ecc = atmel_ooblayout_ecc_sp,
> +	.free = atmel_ooblayout_free_sp,
>  };
>  
>  struct atmel_nfc {
> @@ -163,8 +177,6 @@ struct atmel_nand_host {
>  	int			*pmecc_delta;
>  };
>  
> -static struct nand_ecclayout atmel_pmecc_oobinfo;
> -
>  /*
>   * Enable NAND.
>   */
> @@ -483,22 +495,6 @@ static int pmecc_get_ecc_bytes(int cap, int sector_size)
>  	return (m * cap + 7) / 8;
>  }
>  
> -static void pmecc_config_ecc_layout(struct nand_ecclayout *layout,
> -				    int oobsize, int ecc_len)
> -{
> -	int i;
> -
> -	layout->eccbytes = ecc_len;
> -
> -	/* ECC will occupy the last ecc_len bytes continuously */
> -	for (i = 0; i < ecc_len; i++)
> -		layout->eccpos[i] = oobsize - ecc_len + i;
> -
> -	layout->oobfree[0].offset = PMECC_OOB_RESERVED_BYTES;
> -	layout->oobfree[0].length =
> -		oobsize - ecc_len - layout->oobfree[0].offset;
> -}
> -
>  static void __iomem *pmecc_get_alpha_to(struct atmel_nand_host *host)
>  {
>  	int table_size;
> @@ -1013,8 +1009,8 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
>  {
>  	struct nand_chip *nand_chip = mtd_to_nand(mtd);
>  	struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
> +	int eccbytes = mtd_ooblayout_count_eccbytes(mtd);
>  	uint32_t val = 0;
> -	struct nand_ecclayout *ecc_layout;
>  	struct mtd_oob_region oobregion;
>  
>  	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST);
> @@ -1065,12 +1061,11 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
>  		| PMECC_CFG_AUTO_DISABLE);
>  	pmecc_writel(host->ecc, CFG, val);
>  
> -	ecc_layout = nand_chip->ecc.layout;
>  	pmecc_writel(host->ecc, SAREA, mtd->oobsize - 1);
>  	mtd_ooblayout_ecc(mtd, 0, &oobregion);
>  	pmecc_writel(host->ecc, SADDR, oobregion.offset);
>  	pmecc_writel(host->ecc, EADDR,
> -		     oobregion.offset + ecc_layout->eccbytes - 1);
> +		     oobregion.offset + eccbytes - 1);
>  	/* See datasheet about PMECC Clock Control Register */
>  	pmecc_writel(host->ecc, CLK, 2);
>  	pmecc_writel(host->ecc, IDR, 0xff);
> @@ -1292,11 +1287,8 @@ static int atmel_pmecc_nand_init_params(struct platform_device *pdev,
>  			err_no = -EINVAL;
>  			goto err;
>  		}
> -		pmecc_config_ecc_layout(&atmel_pmecc_oobinfo,
> -					mtd->oobsize,
> -					nand_chip->ecc.total);
>  
> -		nand_chip->ecc.layout = &atmel_pmecc_oobinfo;
> +		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
>  		break;
>  	default:
>  		dev_warn(host->dev,
> @@ -1644,19 +1636,19 @@ static int atmel_hw_nand_init_params(struct platform_device *pdev,
>  	/* set ECC page size and oob layout */
>  	switch (mtd->writesize) {
>  	case 512:
> -		nand_chip->ecc.layout = &atmel_oobinfo_small;
> +		mtd_set_ooblayout(mtd, &atmel_ooblayout_sp_ops);
>  		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_528);
>  		break;
>  	case 1024:
> -		nand_chip->ecc.layout = &atmel_oobinfo_large;
> +		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
>  		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_1056);
>  		break;
>  	case 2048:
> -		nand_chip->ecc.layout = &atmel_oobinfo_large;
> +		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
>  		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_2112);
>  		break;
>  	case 4096:
> -		nand_chip->ecc.layout = &atmel_oobinfo_large;
> +		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
>  		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_4224);
>  		break;
>  	default:



-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

Re: [PATCH v5 22/50] mtd: nand: atmel: switch to mtd_ooblayout_ops

[Boris Brezillon]

On Wed, 30 Mar 2016 18:14:37 +0200
Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org> wrote:

> Implementing the mtd_ooblayout_ops interface is the new way of exposing
> ECC/OOB layout to MTD users.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>

Tested with mtd_oobtest.ko on sama5d4ek.

Tested-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>

> ---
>  drivers/mtd/nand/atmel_nand.c | 84 ++++++++++++++++++++-----------------------
>  1 file changed, 38 insertions(+), 46 deletions(-)
> 
> diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
> index 321d331..46a601e 100644
> --- a/drivers/mtd/nand/atmel_nand.c
> +++ b/drivers/mtd/nand/atmel_nand.c
> @@ -72,30 +72,44 @@ struct atmel_nand_nfc_caps {
>  	uint32_t rb_mask;
>  };
>  
> -/* oob layout for large page size
> +/*
> + * oob layout for large page size
>   * bad block info is on bytes 0 and 1
>   * the bytes have to be consecutives to avoid
>   * several NAND_CMD_RNDOUT during read
> - */
> -static struct nand_ecclayout atmel_oobinfo_large = {
> -	.eccbytes = 4,
> -	.eccpos = {60, 61, 62, 63},
> -	.oobfree = {
> -		{2, 58}
> -	},
> -};
> -
> -/* oob layout for small page size
> + *
> + * oob layout for small page size
>   * bad block info is on bytes 4 and 5
>   * the bytes have to be consecutives to avoid
>   * several NAND_CMD_RNDOUT during read
>   */
> -static struct nand_ecclayout atmel_oobinfo_small = {
> -	.eccbytes = 4,
> -	.eccpos = {0, 1, 2, 3},
> -	.oobfree = {
> -		{6, 10}
> -	},
> +static int atmel_ooblayout_ecc_sp(struct mtd_info *mtd, int section,
> +				  struct mtd_oob_region *oobregion)
> +{
> +	if (section)
> +		return -ERANGE;
> +
> +	oobregion->length = 4;
> +	oobregion->offset = 0;
> +
> +	return 0;
> +}
> +
> +static int atmel_ooblayout_free_sp(struct mtd_info *mtd, int section,
> +				   struct mtd_oob_region *oobregion)
> +{
> +	if (section)
> +		return -ERANGE;
> +
> +	oobregion->offset = 6;
> +	oobregion->length = mtd->oobsize - oobregion->offset;
> +
> +	return 0;
> +}
> +
> +static const struct mtd_ooblayout_ops atmel_ooblayout_sp_ops = {
> +	.ecc = atmel_ooblayout_ecc_sp,
> +	.free = atmel_ooblayout_free_sp,
>  };
>  
>  struct atmel_nfc {
> @@ -163,8 +177,6 @@ struct atmel_nand_host {
>  	int			*pmecc_delta;
>  };
>  
> -static struct nand_ecclayout atmel_pmecc_oobinfo;
> -
>  /*
>   * Enable NAND.
>   */
> @@ -483,22 +495,6 @@ static int pmecc_get_ecc_bytes(int cap, int sector_size)
>  	return (m * cap + 7) / 8;
>  }
>  
> -static void pmecc_config_ecc_layout(struct nand_ecclayout *layout,
> -				    int oobsize, int ecc_len)
> -{
> -	int i;
> -
> -	layout->eccbytes = ecc_len;
> -
> -	/* ECC will occupy the last ecc_len bytes continuously */
> -	for (i = 0; i < ecc_len; i++)
> -		layout->eccpos[i] = oobsize - ecc_len + i;
> -
> -	layout->oobfree[0].offset = PMECC_OOB_RESERVED_BYTES;
> -	layout->oobfree[0].length =
> -		oobsize - ecc_len - layout->oobfree[0].offset;
> -}
> -
>  static void __iomem *pmecc_get_alpha_to(struct atmel_nand_host *host)
>  {
>  	int table_size;
> @@ -1013,8 +1009,8 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
>  {
>  	struct nand_chip *nand_chip = mtd_to_nand(mtd);
>  	struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
> +	int eccbytes = mtd_ooblayout_count_eccbytes(mtd);
>  	uint32_t val = 0;
> -	struct nand_ecclayout *ecc_layout;
>  	struct mtd_oob_region oobregion;
>  
>  	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST);
> @@ -1065,12 +1061,11 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
>  		| PMECC_CFG_AUTO_DISABLE);
>  	pmecc_writel(host->ecc, CFG, val);
>  
> -	ecc_layout = nand_chip->ecc.layout;
>  	pmecc_writel(host->ecc, SAREA, mtd->oobsize - 1);
>  	mtd_ooblayout_ecc(mtd, 0, &oobregion);
>  	pmecc_writel(host->ecc, SADDR, oobregion.offset);
>  	pmecc_writel(host->ecc, EADDR,
> -		     oobregion.offset + ecc_layout->eccbytes - 1);
> +		     oobregion.offset + eccbytes - 1);
>  	/* See datasheet about PMECC Clock Control Register */
>  	pmecc_writel(host->ecc, CLK, 2);
>  	pmecc_writel(host->ecc, IDR, 0xff);
> @@ -1292,11 +1287,8 @@ static int atmel_pmecc_nand_init_params(struct platform_device *pdev,
>  			err_no = -EINVAL;
>  			goto err;
>  		}
> -		pmecc_config_ecc_layout(&atmel_pmecc_oobinfo,
> -					mtd->oobsize,
> -					nand_chip->ecc.total);
>  
> -		nand_chip->ecc.layout = &atmel_pmecc_oobinfo;
> +		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
>  		break;
>  	default:
>  		dev_warn(host->dev,
> @@ -1644,19 +1636,19 @@ static int atmel_hw_nand_init_params(struct platform_device *pdev,
>  	/* set ECC page size and oob layout */
>  	switch (mtd->writesize) {
>  	case 512:
> -		nand_chip->ecc.layout = &atmel_oobinfo_small;
> +		mtd_set_ooblayout(mtd, &atmel_ooblayout_sp_ops);
>  		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_528);
>  		break;
>  	case 1024:
> -		nand_chip->ecc.layout = &atmel_oobinfo_large;
> +		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
>  		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_1056);
>  		break;
>  	case 2048:
> -		nand_chip->ecc.layout = &atmel_oobinfo_large;
> +		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
>  		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_2112);
>  		break;
>  	case 4096:
> -		nand_chip->ecc.layout = &atmel_oobinfo_large;
> +		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
>  		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_4224);
>  		break;
>  	default:



-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

[PATCH v5 22/50] mtd: nand: atmel: switch to mtd_ooblayout_ops

[Boris Brezillon]

On Wed, 30 Mar 2016 18:14:37 +0200
Boris Brezillon <boris.brezillon@free-electrons.com> wrote:

> Implementing the mtd_ooblayout_ops interface is the new way of exposing
> ECC/OOB layout to MTD users.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>

Tested with mtd_oobtest.ko on sama5d4ek.

Tested-by: Boris Brezillon <boris.brezillon@free-electrons.com>

> ---
>  drivers/mtd/nand/atmel_nand.c | 84 ++++++++++++++++++++-----------------------
>  1 file changed, 38 insertions(+), 46 deletions(-)
> 
> diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
> index 321d331..46a601e 100644
> --- a/drivers/mtd/nand/atmel_nand.c
> +++ b/drivers/mtd/nand/atmel_nand.c
> @@ -72,30 +72,44 @@ struct atmel_nand_nfc_caps {
>  	uint32_t rb_mask;
>  };
>  
> -/* oob layout for large page size
> +/*
> + * oob layout for large page size
>   * bad block info is on bytes 0 and 1
>   * the bytes have to be consecutives to avoid
>   * several NAND_CMD_RNDOUT during read
> - */
> -static struct nand_ecclayout atmel_oobinfo_large = {
> -	.eccbytes = 4,
> -	.eccpos = {60, 61, 62, 63},
> -	.oobfree = {
> -		{2, 58}
> -	},
> -};
> -
> -/* oob layout for small page size
> + *
> + * oob layout for small page size
>   * bad block info is on bytes 4 and 5
>   * the bytes have to be consecutives to avoid
>   * several NAND_CMD_RNDOUT during read
>   */
> -static struct nand_ecclayout atmel_oobinfo_small = {
> -	.eccbytes = 4,
> -	.eccpos = {0, 1, 2, 3},
> -	.oobfree = {
> -		{6, 10}
> -	},
> +static int atmel_ooblayout_ecc_sp(struct mtd_info *mtd, int section,
> +				  struct mtd_oob_region *oobregion)
> +{
> +	if (section)
> +		return -ERANGE;
> +
> +	oobregion->length = 4;
> +	oobregion->offset = 0;
> +
> +	return 0;
> +}
> +
> +static int atmel_ooblayout_free_sp(struct mtd_info *mtd, int section,
> +				   struct mtd_oob_region *oobregion)
> +{
> +	if (section)
> +		return -ERANGE;
> +
> +	oobregion->offset = 6;
> +	oobregion->length = mtd->oobsize - oobregion->offset;
> +
> +	return 0;
> +}
> +
> +static const struct mtd_ooblayout_ops atmel_ooblayout_sp_ops = {
> +	.ecc = atmel_ooblayout_ecc_sp,
> +	.free = atmel_ooblayout_free_sp,
>  };
>  
>  struct atmel_nfc {
> @@ -163,8 +177,6 @@ struct atmel_nand_host {
>  	int			*pmecc_delta;
>  };
>  
> -static struct nand_ecclayout atmel_pmecc_oobinfo;
> -
>  /*
>   * Enable NAND.
>   */
> @@ -483,22 +495,6 @@ static int pmecc_get_ecc_bytes(int cap, int sector_size)
>  	return (m * cap + 7) / 8;
>  }
>  
> -static void pmecc_config_ecc_layout(struct nand_ecclayout *layout,
> -				    int oobsize, int ecc_len)
> -{
> -	int i;
> -
> -	layout->eccbytes = ecc_len;
> -
> -	/* ECC will occupy the last ecc_len bytes continuously */
> -	for (i = 0; i < ecc_len; i++)
> -		layout->eccpos[i] = oobsize - ecc_len + i;
> -
> -	layout->oobfree[0].offset = PMECC_OOB_RESERVED_BYTES;
> -	layout->oobfree[0].length =
> -		oobsize - ecc_len - layout->oobfree[0].offset;
> -}
> -
>  static void __iomem *pmecc_get_alpha_to(struct atmel_nand_host *host)
>  {
>  	int table_size;
> @@ -1013,8 +1009,8 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
>  {
>  	struct nand_chip *nand_chip = mtd_to_nand(mtd);
>  	struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
> +	int eccbytes = mtd_ooblayout_count_eccbytes(mtd);
>  	uint32_t val = 0;
> -	struct nand_ecclayout *ecc_layout;
>  	struct mtd_oob_region oobregion;
>  
>  	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST);
> @@ -1065,12 +1061,11 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
>  		| PMECC_CFG_AUTO_DISABLE);
>  	pmecc_writel(host->ecc, CFG, val);
>  
> -	ecc_layout = nand_chip->ecc.layout;
>  	pmecc_writel(host->ecc, SAREA, mtd->oobsize - 1);
>  	mtd_ooblayout_ecc(mtd, 0, &oobregion);
>  	pmecc_writel(host->ecc, SADDR, oobregion.offset);
>  	pmecc_writel(host->ecc, EADDR,
> -		     oobregion.offset + ecc_layout->eccbytes - 1);
> +		     oobregion.offset + eccbytes - 1);
>  	/* See datasheet about PMECC Clock Control Register */
>  	pmecc_writel(host->ecc, CLK, 2);
>  	pmecc_writel(host->ecc, IDR, 0xff);
> @@ -1292,11 +1287,8 @@ static int atmel_pmecc_nand_init_params(struct platform_device *pdev,
>  			err_no = -EINVAL;
>  			goto err;
>  		}
> -		pmecc_config_ecc_layout(&atmel_pmecc_oobinfo,
> -					mtd->oobsize,
> -					nand_chip->ecc.total);
>  
> -		nand_chip->ecc.layout = &atmel_pmecc_oobinfo;
> +		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
>  		break;
>  	default:
>  		dev_warn(host->dev,
> @@ -1644,19 +1636,19 @@ static int atmel_hw_nand_init_params(struct platform_device *pdev,
>  	/* set ECC page size and oob layout */
>  	switch (mtd->writesize) {
>  	case 512:
> -		nand_chip->ecc.layout = &atmel_oobinfo_small;
> +		mtd_set_ooblayout(mtd, &atmel_ooblayout_sp_ops);
>  		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_528);
>  		break;
>  	case 1024:
> -		nand_chip->ecc.layout = &atmel_oobinfo_large;
> +		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
>  		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_1056);
>  		break;
>  	case 2048:
> -		nand_chip->ecc.layout = &atmel_oobinfo_large;
> +		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
>  		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_2112);
>  		break;
>  	case 4096:
> -		nand_chip->ecc.layout = &atmel_oobinfo_large;
> +		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
>  		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_4224);
>  		break;
>  	default:



-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

Re: [PATCH v5 22/50] mtd: nand: atmel: switch to mtd_ooblayout_ops

[Nicolas Ferre]

Le 30/03/2016 18:14, Boris Brezillon a écrit :
> Implementing the mtd_ooblayout_ops interface is the new way of exposing
> ECC/OOB layout to MTD users.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>

It seems good:
Reviewed-by: Nicolas Ferre <nicolas.ferre@atmel.com>

Bye,


> ---
>  drivers/mtd/nand/atmel_nand.c | 84 ++++++++++++++++++++-----------------------
>  1 file changed, 38 insertions(+), 46 deletions(-)
> 
> diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
> index 321d331..46a601e 100644
> --- a/drivers/mtd/nand/atmel_nand.c
> +++ b/drivers/mtd/nand/atmel_nand.c
> @@ -72,30 +72,44 @@ struct atmel_nand_nfc_caps {
>  	uint32_t rb_mask;
>  };
>  
> -/* oob layout for large page size
> +/*
> + * oob layout for large page size
>   * bad block info is on bytes 0 and 1
>   * the bytes have to be consecutives to avoid
>   * several NAND_CMD_RNDOUT during read
> - */
> -static struct nand_ecclayout atmel_oobinfo_large = {
> -	.eccbytes = 4,
> -	.eccpos = {60, 61, 62, 63},
> -	.oobfree = {
> -		{2, 58}
> -	},
> -};
> -
> -/* oob layout for small page size
> + *
> + * oob layout for small page size
>   * bad block info is on bytes 4 and 5
>   * the bytes have to be consecutives to avoid
>   * several NAND_CMD_RNDOUT during read
>   */
> -static struct nand_ecclayout atmel_oobinfo_small = {
> -	.eccbytes = 4,
> -	.eccpos = {0, 1, 2, 3},
> -	.oobfree = {
> -		{6, 10}
> -	},
> +static int atmel_ooblayout_ecc_sp(struct mtd_info *mtd, int section,
> +				  struct mtd_oob_region *oobregion)
> +{
> +	if (section)
> +		return -ERANGE;
> +
> +	oobregion->length = 4;
> +	oobregion->offset = 0;
> +
> +	return 0;
> +}
> +
> +static int atmel_ooblayout_free_sp(struct mtd_info *mtd, int section,
> +				   struct mtd_oob_region *oobregion)
> +{
> +	if (section)
> +		return -ERANGE;
> +
> +	oobregion->offset = 6;
> +	oobregion->length = mtd->oobsize - oobregion->offset;
> +
> +	return 0;
> +}
> +
> +static const struct mtd_ooblayout_ops atmel_ooblayout_sp_ops = {
> +	.ecc = atmel_ooblayout_ecc_sp,
> +	.free = atmel_ooblayout_free_sp,
>  };
>  
>  struct atmel_nfc {
> @@ -163,8 +177,6 @@ struct atmel_nand_host {
>  	int			*pmecc_delta;
>  };
>  
> -static struct nand_ecclayout atmel_pmecc_oobinfo;
> -
>  /*
>   * Enable NAND.
>   */
> @@ -483,22 +495,6 @@ static int pmecc_get_ecc_bytes(int cap, int sector_size)
>  	return (m * cap + 7) / 8;
>  }
>  
> -static void pmecc_config_ecc_layout(struct nand_ecclayout *layout,
> -				    int oobsize, int ecc_len)
> -{
> -	int i;
> -
> -	layout->eccbytes = ecc_len;
> -
> -	/* ECC will occupy the last ecc_len bytes continuously */
> -	for (i = 0; i < ecc_len; i++)
> -		layout->eccpos[i] = oobsize - ecc_len + i;
> -
> -	layout->oobfree[0].offset = PMECC_OOB_RESERVED_BYTES;
> -	layout->oobfree[0].length =
> -		oobsize - ecc_len - layout->oobfree[0].offset;
> -}
> -
>  static void __iomem *pmecc_get_alpha_to(struct atmel_nand_host *host)
>  {
>  	int table_size;
> @@ -1013,8 +1009,8 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
>  {
>  	struct nand_chip *nand_chip = mtd_to_nand(mtd);
>  	struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
> +	int eccbytes = mtd_ooblayout_count_eccbytes(mtd);
>  	uint32_t val = 0;
> -	struct nand_ecclayout *ecc_layout;
>  	struct mtd_oob_region oobregion;
>  
>  	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST);
> @@ -1065,12 +1061,11 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
>  		| PMECC_CFG_AUTO_DISABLE);
>  	pmecc_writel(host->ecc, CFG, val);
>  
> -	ecc_layout = nand_chip->ecc.layout;
>  	pmecc_writel(host->ecc, SAREA, mtd->oobsize - 1);
>  	mtd_ooblayout_ecc(mtd, 0, &oobregion);
>  	pmecc_writel(host->ecc, SADDR, oobregion.offset);
>  	pmecc_writel(host->ecc, EADDR,
> -		     oobregion.offset + ecc_layout->eccbytes - 1);
> +		     oobregion.offset + eccbytes - 1);
>  	/* See datasheet about PMECC Clock Control Register */
>  	pmecc_writel(host->ecc, CLK, 2);
>  	pmecc_writel(host->ecc, IDR, 0xff);
> @@ -1292,11 +1287,8 @@ static int atmel_pmecc_nand_init_params(struct platform_device *pdev,
>  			err_no = -EINVAL;
>  			goto err;
>  		}
> -		pmecc_config_ecc_layout(&atmel_pmecc_oobinfo,
> -					mtd->oobsize,
> -					nand_chip->ecc.total);
>  
> -		nand_chip->ecc.layout = &atmel_pmecc_oobinfo;
> +		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
>  		break;
>  	default:
>  		dev_warn(host->dev,
> @@ -1644,19 +1636,19 @@ static int atmel_hw_nand_init_params(struct platform_device *pdev,
>  	/* set ECC page size and oob layout */
>  	switch (mtd->writesize) {
>  	case 512:
> -		nand_chip->ecc.layout = &atmel_oobinfo_small;
> +		mtd_set_ooblayout(mtd, &atmel_ooblayout_sp_ops);
>  		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_528);
>  		break;
>  	case 1024:
> -		nand_chip->ecc.layout = &atmel_oobinfo_large;
> +		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
>  		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_1056);
>  		break;
>  	case 2048:
> -		nand_chip->ecc.layout = &atmel_oobinfo_large;
> +		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
>  		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_2112);
>  		break;
>  	case 4096:
> -		nand_chip->ecc.layout = &atmel_oobinfo_large;
> +		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
>  		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_4224);
>  		break;
>  	default:
> 


-- 
Nicolas Ferre

Re: [PATCH v5 22/50] mtd: nand: atmel: switch to mtd_ooblayout_ops

[Nicolas Ferre]

Le 30/03/2016 18:14, Boris Brezillon a écrit :
> Implementing the mtd_ooblayout_ops interface is the new way of exposing
> ECC/OOB layout to MTD users.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>

It seems good:
Reviewed-by: Nicolas Ferre <nicolas.ferre-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org>

Bye,


> ---
>  drivers/mtd/nand/atmel_nand.c | 84 ++++++++++++++++++++-----------------------
>  1 file changed, 38 insertions(+), 46 deletions(-)
> 
> diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
> index 321d331..46a601e 100644
> --- a/drivers/mtd/nand/atmel_nand.c
> +++ b/drivers/mtd/nand/atmel_nand.c
> @@ -72,30 +72,44 @@ struct atmel_nand_nfc_caps {
>  	uint32_t rb_mask;
>  };
>  
> -/* oob layout for large page size
> +/*
> + * oob layout for large page size
>   * bad block info is on bytes 0 and 1
>   * the bytes have to be consecutives to avoid
>   * several NAND_CMD_RNDOUT during read
> - */
> -static struct nand_ecclayout atmel_oobinfo_large = {
> -	.eccbytes = 4,
> -	.eccpos = {60, 61, 62, 63},
> -	.oobfree = {
> -		{2, 58}
> -	},
> -};
> -
> -/* oob layout for small page size
> + *
> + * oob layout for small page size
>   * bad block info is on bytes 4 and 5
>   * the bytes have to be consecutives to avoid
>   * several NAND_CMD_RNDOUT during read
>   */
> -static struct nand_ecclayout atmel_oobinfo_small = {
> -	.eccbytes = 4,
> -	.eccpos = {0, 1, 2, 3},
> -	.oobfree = {
> -		{6, 10}
> -	},
> +static int atmel_ooblayout_ecc_sp(struct mtd_info *mtd, int section,
> +				  struct mtd_oob_region *oobregion)
> +{
> +	if (section)
> +		return -ERANGE;
> +
> +	oobregion->length = 4;
> +	oobregion->offset = 0;
> +
> +	return 0;
> +}
> +
> +static int atmel_ooblayout_free_sp(struct mtd_info *mtd, int section,
> +				   struct mtd_oob_region *oobregion)
> +{
> +	if (section)
> +		return -ERANGE;
> +
> +	oobregion->offset = 6;
> +	oobregion->length = mtd->oobsize - oobregion->offset;
> +
> +	return 0;
> +}
> +
> +static const struct mtd_ooblayout_ops atmel_ooblayout_sp_ops = {
> +	.ecc = atmel_ooblayout_ecc_sp,
> +	.free = atmel_ooblayout_free_sp,
>  };
>  
>  struct atmel_nfc {
> @@ -163,8 +177,6 @@ struct atmel_nand_host {
>  	int			*pmecc_delta;
>  };
>  
> -static struct nand_ecclayout atmel_pmecc_oobinfo;
> -
>  /*
>   * Enable NAND.
>   */
> @@ -483,22 +495,6 @@ static int pmecc_get_ecc_bytes(int cap, int sector_size)
>  	return (m * cap + 7) / 8;
>  }
>  
> -static void pmecc_config_ecc_layout(struct nand_ecclayout *layout,
> -				    int oobsize, int ecc_len)
> -{
> -	int i;
> -
> -	layout->eccbytes = ecc_len;
> -
> -	/* ECC will occupy the last ecc_len bytes continuously */
> -	for (i = 0; i < ecc_len; i++)
> -		layout->eccpos[i] = oobsize - ecc_len + i;
> -
> -	layout->oobfree[0].offset = PMECC_OOB_RESERVED_BYTES;
> -	layout->oobfree[0].length =
> -		oobsize - ecc_len - layout->oobfree[0].offset;
> -}
> -
>  static void __iomem *pmecc_get_alpha_to(struct atmel_nand_host *host)
>  {
>  	int table_size;
> @@ -1013,8 +1009,8 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
>  {
>  	struct nand_chip *nand_chip = mtd_to_nand(mtd);
>  	struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
> +	int eccbytes = mtd_ooblayout_count_eccbytes(mtd);
>  	uint32_t val = 0;
> -	struct nand_ecclayout *ecc_layout;
>  	struct mtd_oob_region oobregion;
>  
>  	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST);
> @@ -1065,12 +1061,11 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
>  		| PMECC_CFG_AUTO_DISABLE);
>  	pmecc_writel(host->ecc, CFG, val);
>  
> -	ecc_layout = nand_chip->ecc.layout;
>  	pmecc_writel(host->ecc, SAREA, mtd->oobsize - 1);
>  	mtd_ooblayout_ecc(mtd, 0, &oobregion);
>  	pmecc_writel(host->ecc, SADDR, oobregion.offset);
>  	pmecc_writel(host->ecc, EADDR,
> -		     oobregion.offset + ecc_layout->eccbytes - 1);
> +		     oobregion.offset + eccbytes - 1);
>  	/* See datasheet about PMECC Clock Control Register */
>  	pmecc_writel(host->ecc, CLK, 2);
>  	pmecc_writel(host->ecc, IDR, 0xff);
> @@ -1292,11 +1287,8 @@ static int atmel_pmecc_nand_init_params(struct platform_device *pdev,
>  			err_no = -EINVAL;
>  			goto err;
>  		}
> -		pmecc_config_ecc_layout(&atmel_pmecc_oobinfo,
> -					mtd->oobsize,
> -					nand_chip->ecc.total);
>  
> -		nand_chip->ecc.layout = &atmel_pmecc_oobinfo;
> +		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
>  		break;
>  	default:
>  		dev_warn(host->dev,
> @@ -1644,19 +1636,19 @@ static int atmel_hw_nand_init_params(struct platform_device *pdev,
>  	/* set ECC page size and oob layout */
>  	switch (mtd->writesize) {
>  	case 512:
> -		nand_chip->ecc.layout = &atmel_oobinfo_small;
> +		mtd_set_ooblayout(mtd, &atmel_ooblayout_sp_ops);
>  		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_528);
>  		break;
>  	case 1024:
> -		nand_chip->ecc.layout = &atmel_oobinfo_large;
> +		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
>  		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_1056);
>  		break;
>  	case 2048:
> -		nand_chip->ecc.layout = &atmel_oobinfo_large;
> +		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
>  		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_2112);
>  		break;
>  	case 4096:
> -		nand_chip->ecc.layout = &atmel_oobinfo_large;
> +		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
>  		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_4224);
>  		break;
>  	default:
> 


-- 
Nicolas Ferre

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Re: [PATCH v5 22/50] mtd: nand: atmel: switch to mtd_ooblayout_ops

[Nicolas Ferre]

Le 30/03/2016 18:14, Boris Brezillon a écrit :
> Implementing the mtd_ooblayout_ops interface is the new way of exposing
> ECC/OOB layout to MTD users.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>

It seems good:
Reviewed-by: Nicolas Ferre <nicolas.ferre@atmel.com>

Bye,


> ---
>  drivers/mtd/nand/atmel_nand.c | 84 ++++++++++++++++++++-----------------------
>  1 file changed, 38 insertions(+), 46 deletions(-)
> 
> diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
> index 321d331..46a601e 100644
> --- a/drivers/mtd/nand/atmel_nand.c
> +++ b/drivers/mtd/nand/atmel_nand.c
> @@ -72,30 +72,44 @@ struct atmel_nand_nfc_caps {
>  	uint32_t rb_mask;
>  };
>  
> -/* oob layout for large page size
> +/*
> + * oob layout for large page size
>   * bad block info is on bytes 0 and 1
>   * the bytes have to be consecutives to avoid
>   * several NAND_CMD_RNDOUT during read
> - */
> -static struct nand_ecclayout atmel_oobinfo_large = {
> -	.eccbytes = 4,
> -	.eccpos = {60, 61, 62, 63},
> -	.oobfree = {
> -		{2, 58}
> -	},
> -};
> -
> -/* oob layout for small page size
> + *
> + * oob layout for small page size
>   * bad block info is on bytes 4 and 5
>   * the bytes have to be consecutives to avoid
>   * several NAND_CMD_RNDOUT during read
>   */
> -static struct nand_ecclayout atmel_oobinfo_small = {
> -	.eccbytes = 4,
> -	.eccpos = {0, 1, 2, 3},
> -	.oobfree = {
> -		{6, 10}
> -	},
> +static int atmel_ooblayout_ecc_sp(struct mtd_info *mtd, int section,
> +				  struct mtd_oob_region *oobregion)
> +{
> +	if (section)
> +		return -ERANGE;
> +
> +	oobregion->length = 4;
> +	oobregion->offset = 0;
> +
> +	return 0;
> +}
> +
> +static int atmel_ooblayout_free_sp(struct mtd_info *mtd, int section,
> +				   struct mtd_oob_region *oobregion)
> +{
> +	if (section)
> +		return -ERANGE;
> +
> +	oobregion->offset = 6;
> +	oobregion->length = mtd->oobsize - oobregion->offset;
> +
> +	return 0;
> +}
> +
> +static const struct mtd_ooblayout_ops atmel_ooblayout_sp_ops = {
> +	.ecc = atmel_ooblayout_ecc_sp,
> +	.free = atmel_ooblayout_free_sp,
>  };
>  
>  struct atmel_nfc {
> @@ -163,8 +177,6 @@ struct atmel_nand_host {
>  	int			*pmecc_delta;
>  };
>  
> -static struct nand_ecclayout atmel_pmecc_oobinfo;
> -
>  /*
>   * Enable NAND.
>   */
> @@ -483,22 +495,6 @@ static int pmecc_get_ecc_bytes(int cap, int sector_size)
>  	return (m * cap + 7) / 8;
>  }
>  
> -static void pmecc_config_ecc_layout(struct nand_ecclayout *layout,
> -				    int oobsize, int ecc_len)
> -{
> -	int i;
> -
> -	layout->eccbytes = ecc_len;
> -
> -	/* ECC will occupy the last ecc_len bytes continuously */
> -	for (i = 0; i < ecc_len; i++)
> -		layout->eccpos[i] = oobsize - ecc_len + i;
> -
> -	layout->oobfree[0].offset = PMECC_OOB_RESERVED_BYTES;
> -	layout->oobfree[0].length =
> -		oobsize - ecc_len - layout->oobfree[0].offset;
> -}
> -
>  static void __iomem *pmecc_get_alpha_to(struct atmel_nand_host *host)
>  {
>  	int table_size;
> @@ -1013,8 +1009,8 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
>  {
>  	struct nand_chip *nand_chip = mtd_to_nand(mtd);
>  	struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
> +	int eccbytes = mtd_ooblayout_count_eccbytes(mtd);
>  	uint32_t val = 0;
> -	struct nand_ecclayout *ecc_layout;
>  	struct mtd_oob_region oobregion;
>  
>  	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST);
> @@ -1065,12 +1061,11 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
>  		| PMECC_CFG_AUTO_DISABLE);
>  	pmecc_writel(host->ecc, CFG, val);
>  
> -	ecc_layout = nand_chip->ecc.layout;
>  	pmecc_writel(host->ecc, SAREA, mtd->oobsize - 1);
>  	mtd_ooblayout_ecc(mtd, 0, &oobregion);
>  	pmecc_writel(host->ecc, SADDR, oobregion.offset);
>  	pmecc_writel(host->ecc, EADDR,
> -		     oobregion.offset + ecc_layout->eccbytes - 1);
> +		     oobregion.offset + eccbytes - 1);
>  	/* See datasheet about PMECC Clock Control Register */
>  	pmecc_writel(host->ecc, CLK, 2);
>  	pmecc_writel(host->ecc, IDR, 0xff);
> @@ -1292,11 +1287,8 @@ static int atmel_pmecc_nand_init_params(struct platform_device *pdev,
>  			err_no = -EINVAL;
>  			goto err;
>  		}
> -		pmecc_config_ecc_layout(&atmel_pmecc_oobinfo,
> -					mtd->oobsize,
> -					nand_chip->ecc.total);
>  
> -		nand_chip->ecc.layout = &atmel_pmecc_oobinfo;
> +		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
>  		break;
>  	default:
>  		dev_warn(host->dev,
> @@ -1644,19 +1636,19 @@ static int atmel_hw_nand_init_params(struct platform_device *pdev,
>  	/* set ECC page size and oob layout */
>  	switch (mtd->writesize) {
>  	case 512:
> -		nand_chip->ecc.layout = &atmel_oobinfo_small;
> +		mtd_set_ooblayout(mtd, &atmel_ooblayout_sp_ops);
>  		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_528);
>  		break;
>  	case 1024:
> -		nand_chip->ecc.layout = &atmel_oobinfo_large;
> +		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
>  		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_1056);
>  		break;
>  	case 2048:
> -		nand_chip->ecc.layout = &atmel_oobinfo_large;
> +		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
>  		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_2112);
>  		break;
>  	case 4096:
> -		nand_chip->ecc.layout = &atmel_oobinfo_large;
> +		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
>  		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_4224);
>  		break;
>  	default:
> 


-- 
Nicolas Ferre

[PATCH v5 22/50] mtd: nand: atmel: switch to mtd_ooblayout_ops

[Nicolas Ferre]

Le 30/03/2016 18:14, Boris Brezillon a ?crit :
> Implementing the mtd_ooblayout_ops interface is the new way of exposing
> ECC/OOB layout to MTD users.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>

It seems good:
Reviewed-by: Nicolas Ferre <nicolas.ferre@atmel.com>

Bye,


> ---
>  drivers/mtd/nand/atmel_nand.c | 84 ++++++++++++++++++++-----------------------
>  1 file changed, 38 insertions(+), 46 deletions(-)
> 
> diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
> index 321d331..46a601e 100644
> --- a/drivers/mtd/nand/atmel_nand.c
> +++ b/drivers/mtd/nand/atmel_nand.c
> @@ -72,30 +72,44 @@ struct atmel_nand_nfc_caps {
>  	uint32_t rb_mask;
>  };
>  
> -/* oob layout for large page size
> +/*
> + * oob layout for large page size
>   * bad block info is on bytes 0 and 1
>   * the bytes have to be consecutives to avoid
>   * several NAND_CMD_RNDOUT during read
> - */
> -static struct nand_ecclayout atmel_oobinfo_large = {
> -	.eccbytes = 4,
> -	.eccpos = {60, 61, 62, 63},
> -	.oobfree = {
> -		{2, 58}
> -	},
> -};
> -
> -/* oob layout for small page size
> + *
> + * oob layout for small page size
>   * bad block info is on bytes 4 and 5
>   * the bytes have to be consecutives to avoid
>   * several NAND_CMD_RNDOUT during read
>   */
> -static struct nand_ecclayout atmel_oobinfo_small = {
> -	.eccbytes = 4,
> -	.eccpos = {0, 1, 2, 3},
> -	.oobfree = {
> -		{6, 10}
> -	},
> +static int atmel_ooblayout_ecc_sp(struct mtd_info *mtd, int section,
> +				  struct mtd_oob_region *oobregion)
> +{
> +	if (section)
> +		return -ERANGE;
> +
> +	oobregion->length = 4;
> +	oobregion->offset = 0;
> +
> +	return 0;
> +}
> +
> +static int atmel_ooblayout_free_sp(struct mtd_info *mtd, int section,
> +				   struct mtd_oob_region *oobregion)
> +{
> +	if (section)
> +		return -ERANGE;
> +
> +	oobregion->offset = 6;
> +	oobregion->length = mtd->oobsize - oobregion->offset;
> +
> +	return 0;
> +}
> +
> +static const struct mtd_ooblayout_ops atmel_ooblayout_sp_ops = {
> +	.ecc = atmel_ooblayout_ecc_sp,
> +	.free = atmel_ooblayout_free_sp,
>  };
>  
>  struct atmel_nfc {
> @@ -163,8 +177,6 @@ struct atmel_nand_host {
>  	int			*pmecc_delta;
>  };
>  
> -static struct nand_ecclayout atmel_pmecc_oobinfo;
> -
>  /*
>   * Enable NAND.
>   */
> @@ -483,22 +495,6 @@ static int pmecc_get_ecc_bytes(int cap, int sector_size)
>  	return (m * cap + 7) / 8;
>  }
>  
> -static void pmecc_config_ecc_layout(struct nand_ecclayout *layout,
> -				    int oobsize, int ecc_len)
> -{
> -	int i;
> -
> -	layout->eccbytes = ecc_len;
> -
> -	/* ECC will occupy the last ecc_len bytes continuously */
> -	for (i = 0; i < ecc_len; i++)
> -		layout->eccpos[i] = oobsize - ecc_len + i;
> -
> -	layout->oobfree[0].offset = PMECC_OOB_RESERVED_BYTES;
> -	layout->oobfree[0].length =
> -		oobsize - ecc_len - layout->oobfree[0].offset;
> -}
> -
>  static void __iomem *pmecc_get_alpha_to(struct atmel_nand_host *host)
>  {
>  	int table_size;
> @@ -1013,8 +1009,8 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
>  {
>  	struct nand_chip *nand_chip = mtd_to_nand(mtd);
>  	struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
> +	int eccbytes = mtd_ooblayout_count_eccbytes(mtd);
>  	uint32_t val = 0;
> -	struct nand_ecclayout *ecc_layout;
>  	struct mtd_oob_region oobregion;
>  
>  	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST);
> @@ -1065,12 +1061,11 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
>  		| PMECC_CFG_AUTO_DISABLE);
>  	pmecc_writel(host->ecc, CFG, val);
>  
> -	ecc_layout = nand_chip->ecc.layout;
>  	pmecc_writel(host->ecc, SAREA, mtd->oobsize - 1);
>  	mtd_ooblayout_ecc(mtd, 0, &oobregion);
>  	pmecc_writel(host->ecc, SADDR, oobregion.offset);
>  	pmecc_writel(host->ecc, EADDR,
> -		     oobregion.offset + ecc_layout->eccbytes - 1);
> +		     oobregion.offset + eccbytes - 1);
>  	/* See datasheet about PMECC Clock Control Register */
>  	pmecc_writel(host->ecc, CLK, 2);
>  	pmecc_writel(host->ecc, IDR, 0xff);
> @@ -1292,11 +1287,8 @@ static int atmel_pmecc_nand_init_params(struct platform_device *pdev,
>  			err_no = -EINVAL;
>  			goto err;
>  		}
> -		pmecc_config_ecc_layout(&atmel_pmecc_oobinfo,
> -					mtd->oobsize,
> -					nand_chip->ecc.total);
>  
> -		nand_chip->ecc.layout = &atmel_pmecc_oobinfo;
> +		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
>  		break;
>  	default:
>  		dev_warn(host->dev,
> @@ -1644,19 +1636,19 @@ static int atmel_hw_nand_init_params(struct platform_device *pdev,
>  	/* set ECC page size and oob layout */
>  	switch (mtd->writesize) {
>  	case 512:
> -		nand_chip->ecc.layout = &atmel_oobinfo_small;
> +		mtd_set_ooblayout(mtd, &atmel_ooblayout_sp_ops);
>  		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_528);
>  		break;
>  	case 1024:
> -		nand_chip->ecc.layout = &atmel_oobinfo_large;
> +		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
>  		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_1056);
>  		break;
>  	case 2048:
> -		nand_chip->ecc.layout = &atmel_oobinfo_large;
> +		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
>  		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_2112);
>  		break;
>  	case 4096:
> -		nand_chip->ecc.layout = &atmel_oobinfo_large;
> +		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
>  		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_4224);
>  		break;
>  	default:
> 


-- 
Nicolas Ferre

Re: [PATCH v5 04/50] mtd: nand: atmel: use mtd_ooblayout_xxx() helpers where appropriate

[Nicolas Ferre]

Le 30/03/2016 18:14, Boris Brezillon a écrit :
> The mtd_ooblayout_xxx() helper functions have been added to avoid direct
> accesses to the ecclayout field, and thus ease for future reworks.
> Use these helpers in all places where the oobfree[] and eccpos[] arrays
> where directly accessed.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
> ---
>  drivers/mtd/nand/atmel_nand.c | 48 ++++++++++++++++++++++++++-----------------
>  1 file changed, 29 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
> index 0b5da72..321d331 100644
> --- a/drivers/mtd/nand/atmel_nand.c
> +++ b/drivers/mtd/nand/atmel_nand.c
> @@ -836,13 +836,16 @@ static void pmecc_correct_data(struct mtd_info *mtd, uint8_t *buf, uint8_t *ecc,
>  			dev_dbg(host->dev, "Bit flip in data area, byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
>  				pos, bit_pos, err_byte, *(buf + byte_pos));
>  		} else {
> +			struct mtd_oob_region oobregion;
> +
>  			/* Bit flip in OOB area */
>  			tmp = sector_num * nand_chip->ecc.bytes
>  					+ (byte_pos - sector_size);
>  			err_byte = ecc[tmp];
>  			ecc[tmp] ^= (1 << bit_pos);
>  
> -			pos = tmp + nand_chip->ecc.layout->eccpos[0];
> +			mtd_ooblayout_ecc(mtd, 0, &oobregion);
> +			pos = tmp + oobregion.offset;
>  			dev_dbg(host->dev, "Bit flip in OOB, oob_byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
>  				pos, bit_pos, err_byte, ecc[tmp]);
>  		}
> @@ -934,7 +937,6 @@ static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
>  	struct atmel_nand_host *host = nand_get_controller_data(chip);
>  	int eccsize = chip->ecc.size * chip->ecc.steps;
>  	uint8_t *oob = chip->oob_poi;
> -	uint32_t *eccpos = chip->ecc.layout->eccpos;
>  	uint32_t stat;
>  	unsigned long end_time;
>  	int bitflips = 0;
> @@ -956,7 +958,11 @@ static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
>  
>  	stat = pmecc_readl_relaxed(host->ecc, ISR);
>  	if (stat != 0) {
> -		bitflips = pmecc_correction(mtd, stat, buf, &oob[eccpos[0]]);
> +		struct mtd_oob_region oobregion;
> +
> +		mtd_ooblayout_ecc(mtd, 0, &oobregion);
> +		bitflips = pmecc_correction(mtd, stat, buf,
> +					    &oob[oobregion.offset]);
>  		if (bitflips < 0)
>  			/* uncorrectable errors */
>  			return 0;
> @@ -970,8 +976,8 @@ static int atmel_nand_pmecc_write_page(struct mtd_info *mtd,
>  		int page)
>  {
>  	struct atmel_nand_host *host = nand_get_controller_data(chip);
> -	uint32_t *eccpos = chip->ecc.layout->eccpos;
> -	int i, j;
> +	struct mtd_oob_region oobregion = { };
> +	int i, j, section = 0;
>  	unsigned long end_time;
>  
>  	if (!host->nfc || !host->nfc->write_by_sram) {
> @@ -990,11 +996,12 @@ static int atmel_nand_pmecc_write_page(struct mtd_info *mtd,
>  
>  	for (i = 0; i < chip->ecc.steps; i++) {
>  		for (j = 0; j < chip->ecc.bytes; j++) {
> -			int pos;
> +			if (!oobregion.length)
> +				mtd_ooblayout_ecc(mtd, section++, &oobregion);

Here...


>  
> -			pos = i * chip->ecc.bytes + j;
> -			chip->oob_poi[eccpos[pos]] =
> +			chip->oob_poi[oobregion.offset++] =

... and there, are you sure to increment the variable inside the
function call or the table index?

I must say that I don't like it at all.


>  				pmecc_readb_ecc_relaxed(host->ecc, i, j);
> +			oobregion.length--;

Simply do it here, it's so much easier to read and fool proof!


>  		}
>  	}
>  	chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
> @@ -1008,6 +1015,7 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
>  	struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
>  	uint32_t val = 0;
>  	struct nand_ecclayout *ecc_layout;
> +	struct mtd_oob_region oobregion;
>  
>  	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST);
>  	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DISABLE);
> @@ -1059,9 +1067,10 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
>  
>  	ecc_layout = nand_chip->ecc.layout;
>  	pmecc_writel(host->ecc, SAREA, mtd->oobsize - 1);
> -	pmecc_writel(host->ecc, SADDR, ecc_layout->eccpos[0]);
> +	mtd_ooblayout_ecc(mtd, 0, &oobregion);
> +	pmecc_writel(host->ecc, SADDR, oobregion.offset);
>  	pmecc_writel(host->ecc, EADDR,
> -			ecc_layout->eccpos[ecc_layout->eccbytes - 1]);
> +		     oobregion.offset + ecc_layout->eccbytes - 1);
>  	/* See datasheet about PMECC Clock Control Register */
>  	pmecc_writel(host->ecc, CLK, 2);
>  	pmecc_writel(host->ecc, IDR, 0xff);
> @@ -1362,12 +1371,12 @@ static int atmel_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
>  {
>  	int eccsize = chip->ecc.size;
>  	int eccbytes = chip->ecc.bytes;
> -	uint32_t *eccpos = chip->ecc.layout->eccpos;
>  	uint8_t *p = buf;
>  	uint8_t *oob = chip->oob_poi;
>  	uint8_t *ecc_pos;
>  	int stat;
>  	unsigned int max_bitflips = 0;
> +	struct mtd_oob_region oobregion = {};
>  
>  	/*
>  	 * Errata: ALE is incorrectly wired up to the ECC controller
> @@ -1385,19 +1394,20 @@ static int atmel_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
>  	chip->read_buf(mtd, p, eccsize);
>  
>  	/* move to ECC position if needed */
> -	if (eccpos[0] != 0) {
> -		/* This only works on large pages
> -		 * because the ECC controller waits for
> -		 * NAND_CMD_RNDOUTSTART after the
> -		 * NAND_CMD_RNDOUT.
> -		 * anyway, for small pages, the eccpos[0] == 0
> +	mtd_ooblayout_ecc(mtd, 0, &oobregion);
> +	if (oobregion.offset != 0) {
> +		/*
> +		 * This only works on large pages because the ECC controller
> +		 * waits for NAND_CMD_RNDOUTSTART after the NAND_CMD_RNDOUT.
> +		 * Anyway, for small pages, the first ECC byte is at offset
> +		 * 0 in the OOB area.
>  		 */
>  		chip->cmdfunc(mtd, NAND_CMD_RNDOUT,
> -				mtd->writesize + eccpos[0], -1);
> +			      mtd->writesize + oobregion.offset, -1);
>  	}
>  
>  	/* the ECC controller needs to read the ECC just after the data */
> -	ecc_pos = oob + eccpos[0];
> +	ecc_pos = oob + oobregion.offset;
>  	chip->read_buf(mtd, ecc_pos, eccbytes);
>  
>  	/* check if there's an error */
> 


-- 
Nicolas Ferre

Re: [PATCH v5 04/50] mtd: nand: atmel: use mtd_ooblayout_xxx() helpers where appropriate

[Nicolas Ferre]

Le 30/03/2016 18:14, Boris Brezillon a écrit :
> The mtd_ooblayout_xxx() helper functions have been added to avoid direct
> accesses to the ecclayout field, and thus ease for future reworks.
> Use these helpers in all places where the oobfree[] and eccpos[] arrays
> where directly accessed.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
> ---
>  drivers/mtd/nand/atmel_nand.c | 48 ++++++++++++++++++++++++++-----------------
>  1 file changed, 29 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
> index 0b5da72..321d331 100644
> --- a/drivers/mtd/nand/atmel_nand.c
> +++ b/drivers/mtd/nand/atmel_nand.c
> @@ -836,13 +836,16 @@ static void pmecc_correct_data(struct mtd_info *mtd, uint8_t *buf, uint8_t *ecc,
>  			dev_dbg(host->dev, "Bit flip in data area, byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
>  				pos, bit_pos, err_byte, *(buf + byte_pos));
>  		} else {
> +			struct mtd_oob_region oobregion;
> +
>  			/* Bit flip in OOB area */
>  			tmp = sector_num * nand_chip->ecc.bytes
>  					+ (byte_pos - sector_size);
>  			err_byte = ecc[tmp];
>  			ecc[tmp] ^= (1 << bit_pos);
>  
> -			pos = tmp + nand_chip->ecc.layout->eccpos[0];
> +			mtd_ooblayout_ecc(mtd, 0, &oobregion);
> +			pos = tmp + oobregion.offset;
>  			dev_dbg(host->dev, "Bit flip in OOB, oob_byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
>  				pos, bit_pos, err_byte, ecc[tmp]);
>  		}
> @@ -934,7 +937,6 @@ static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
>  	struct atmel_nand_host *host = nand_get_controller_data(chip);
>  	int eccsize = chip->ecc.size * chip->ecc.steps;
>  	uint8_t *oob = chip->oob_poi;
> -	uint32_t *eccpos = chip->ecc.layout->eccpos;
>  	uint32_t stat;
>  	unsigned long end_time;
>  	int bitflips = 0;
> @@ -956,7 +958,11 @@ static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
>  
>  	stat = pmecc_readl_relaxed(host->ecc, ISR);
>  	if (stat != 0) {
> -		bitflips = pmecc_correction(mtd, stat, buf, &oob[eccpos[0]]);
> +		struct mtd_oob_region oobregion;
> +
> +		mtd_ooblayout_ecc(mtd, 0, &oobregion);
> +		bitflips = pmecc_correction(mtd, stat, buf,
> +					    &oob[oobregion.offset]);
>  		if (bitflips < 0)
>  			/* uncorrectable errors */
>  			return 0;
> @@ -970,8 +976,8 @@ static int atmel_nand_pmecc_write_page(struct mtd_info *mtd,
>  		int page)
>  {
>  	struct atmel_nand_host *host = nand_get_controller_data(chip);
> -	uint32_t *eccpos = chip->ecc.layout->eccpos;
> -	int i, j;
> +	struct mtd_oob_region oobregion = { };
> +	int i, j, section = 0;
>  	unsigned long end_time;
>  
>  	if (!host->nfc || !host->nfc->write_by_sram) {
> @@ -990,11 +996,12 @@ static int atmel_nand_pmecc_write_page(struct mtd_info *mtd,
>  
>  	for (i = 0; i < chip->ecc.steps; i++) {
>  		for (j = 0; j < chip->ecc.bytes; j++) {
> -			int pos;
> +			if (!oobregion.length)
> +				mtd_ooblayout_ecc(mtd, section++, &oobregion);

Here...


>  
> -			pos = i * chip->ecc.bytes + j;
> -			chip->oob_poi[eccpos[pos]] =
> +			chip->oob_poi[oobregion.offset++] =

... and there, are you sure to increment the variable inside the
function call or the table index?

I must say that I don't like it at all.


>  				pmecc_readb_ecc_relaxed(host->ecc, i, j);
> +			oobregion.length--;

Simply do it here, it's so much easier to read and fool proof!


>  		}
>  	}
>  	chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
> @@ -1008,6 +1015,7 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
>  	struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
>  	uint32_t val = 0;
>  	struct nand_ecclayout *ecc_layout;
> +	struct mtd_oob_region oobregion;
>  
>  	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST);
>  	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DISABLE);
> @@ -1059,9 +1067,10 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
>  
>  	ecc_layout = nand_chip->ecc.layout;
>  	pmecc_writel(host->ecc, SAREA, mtd->oobsize - 1);
> -	pmecc_writel(host->ecc, SADDR, ecc_layout->eccpos[0]);
> +	mtd_ooblayout_ecc(mtd, 0, &oobregion);
> +	pmecc_writel(host->ecc, SADDR, oobregion.offset);
>  	pmecc_writel(host->ecc, EADDR,
> -			ecc_layout->eccpos[ecc_layout->eccbytes - 1]);
> +		     oobregion.offset + ecc_layout->eccbytes - 1);
>  	/* See datasheet about PMECC Clock Control Register */
>  	pmecc_writel(host->ecc, CLK, 2);
>  	pmecc_writel(host->ecc, IDR, 0xff);
> @@ -1362,12 +1371,12 @@ static int atmel_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
>  {
>  	int eccsize = chip->ecc.size;
>  	int eccbytes = chip->ecc.bytes;
> -	uint32_t *eccpos = chip->ecc.layout->eccpos;
>  	uint8_t *p = buf;
>  	uint8_t *oob = chip->oob_poi;
>  	uint8_t *ecc_pos;
>  	int stat;
>  	unsigned int max_bitflips = 0;
> +	struct mtd_oob_region oobregion = {};
>  
>  	/*
>  	 * Errata: ALE is incorrectly wired up to the ECC controller
> @@ -1385,19 +1394,20 @@ static int atmel_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
>  	chip->read_buf(mtd, p, eccsize);
>  
>  	/* move to ECC position if needed */
> -	if (eccpos[0] != 0) {
> -		/* This only works on large pages
> -		 * because the ECC controller waits for
> -		 * NAND_CMD_RNDOUTSTART after the
> -		 * NAND_CMD_RNDOUT.
> -		 * anyway, for small pages, the eccpos[0] == 0
> +	mtd_ooblayout_ecc(mtd, 0, &oobregion);
> +	if (oobregion.offset != 0) {
> +		/*
> +		 * This only works on large pages because the ECC controller
> +		 * waits for NAND_CMD_RNDOUTSTART after the NAND_CMD_RNDOUT.
> +		 * Anyway, for small pages, the first ECC byte is at offset
> +		 * 0 in the OOB area.
>  		 */
>  		chip->cmdfunc(mtd, NAND_CMD_RNDOUT,
> -				mtd->writesize + eccpos[0], -1);
> +			      mtd->writesize + oobregion.offset, -1);
>  	}
>  
>  	/* the ECC controller needs to read the ECC just after the data */
> -	ecc_pos = oob + eccpos[0];
> +	ecc_pos = oob + oobregion.offset;
>  	chip->read_buf(mtd, ecc_pos, eccbytes);
>  
>  	/* check if there's an error */
> 


-- 
Nicolas Ferre

Re: [PATCH v5 04/50] mtd: nand: atmel: use mtd_ooblayout_xxx() helpers where appropriate

[Nicolas Ferre]

Le 30/03/2016 18:14, Boris Brezillon a écrit :
> The mtd_ooblayout_xxx() helper functions have been added to avoid direct
> accesses to the ecclayout field, and thus ease for future reworks.
> Use these helpers in all places where the oobfree[] and eccpos[] arrays
> where directly accessed.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
> ---
>  drivers/mtd/nand/atmel_nand.c | 48 ++++++++++++++++++++++++++-----------------
>  1 file changed, 29 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
> index 0b5da72..321d331 100644
> --- a/drivers/mtd/nand/atmel_nand.c
> +++ b/drivers/mtd/nand/atmel_nand.c
> @@ -836,13 +836,16 @@ static void pmecc_correct_data(struct mtd_info *mtd, uint8_t *buf, uint8_t *ecc,
>  			dev_dbg(host->dev, "Bit flip in data area, byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
>  				pos, bit_pos, err_byte, *(buf + byte_pos));
>  		} else {
> +			struct mtd_oob_region oobregion;
> +
>  			/* Bit flip in OOB area */
>  			tmp = sector_num * nand_chip->ecc.bytes
>  					+ (byte_pos - sector_size);
>  			err_byte = ecc[tmp];
>  			ecc[tmp] ^= (1 << bit_pos);
>  
> -			pos = tmp + nand_chip->ecc.layout->eccpos[0];
> +			mtd_ooblayout_ecc(mtd, 0, &oobregion);
> +			pos = tmp + oobregion.offset;
>  			dev_dbg(host->dev, "Bit flip in OOB, oob_byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
>  				pos, bit_pos, err_byte, ecc[tmp]);
>  		}
> @@ -934,7 +937,6 @@ static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
>  	struct atmel_nand_host *host = nand_get_controller_data(chip);
>  	int eccsize = chip->ecc.size * chip->ecc.steps;
>  	uint8_t *oob = chip->oob_poi;
> -	uint32_t *eccpos = chip->ecc.layout->eccpos;
>  	uint32_t stat;
>  	unsigned long end_time;
>  	int bitflips = 0;
> @@ -956,7 +958,11 @@ static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
>  
>  	stat = pmecc_readl_relaxed(host->ecc, ISR);
>  	if (stat != 0) {
> -		bitflips = pmecc_correction(mtd, stat, buf, &oob[eccpos[0]]);
> +		struct mtd_oob_region oobregion;
> +
> +		mtd_ooblayout_ecc(mtd, 0, &oobregion);
> +		bitflips = pmecc_correction(mtd, stat, buf,
> +					    &oob[oobregion.offset]);
>  		if (bitflips < 0)
>  			/* uncorrectable errors */
>  			return 0;
> @@ -970,8 +976,8 @@ static int atmel_nand_pmecc_write_page(struct mtd_info *mtd,
>  		int page)
>  {
>  	struct atmel_nand_host *host = nand_get_controller_data(chip);
> -	uint32_t *eccpos = chip->ecc.layout->eccpos;
> -	int i, j;
> +	struct mtd_oob_region oobregion = { };
> +	int i, j, section = 0;
>  	unsigned long end_time;
>  
>  	if (!host->nfc || !host->nfc->write_by_sram) {
> @@ -990,11 +996,12 @@ static int atmel_nand_pmecc_write_page(struct mtd_info *mtd,
>  
>  	for (i = 0; i < chip->ecc.steps; i++) {
>  		for (j = 0; j < chip->ecc.bytes; j++) {
> -			int pos;
> +			if (!oobregion.length)
> +				mtd_ooblayout_ecc(mtd, section++, &oobregion);

Here...


>  
> -			pos = i * chip->ecc.bytes + j;
> -			chip->oob_poi[eccpos[pos]] =
> +			chip->oob_poi[oobregion.offset++] =

... and there, are you sure to increment the variable inside the
function call or the table index?

I must say that I don't like it at all.


>  				pmecc_readb_ecc_relaxed(host->ecc, i, j);
> +			oobregion.length--;

Simply do it here, it's so much easier to read and fool proof!


>  		}
>  	}
>  	chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
> @@ -1008,6 +1015,7 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
>  	struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
>  	uint32_t val = 0;
>  	struct nand_ecclayout *ecc_layout;
> +	struct mtd_oob_region oobregion;
>  
>  	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST);
>  	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DISABLE);
> @@ -1059,9 +1067,10 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
>  
>  	ecc_layout = nand_chip->ecc.layout;
>  	pmecc_writel(host->ecc, SAREA, mtd->oobsize - 1);
> -	pmecc_writel(host->ecc, SADDR, ecc_layout->eccpos[0]);
> +	mtd_ooblayout_ecc(mtd, 0, &oobregion);
> +	pmecc_writel(host->ecc, SADDR, oobregion.offset);
>  	pmecc_writel(host->ecc, EADDR,
> -			ecc_layout->eccpos[ecc_layout->eccbytes - 1]);
> +		     oobregion.offset + ecc_layout->eccbytes - 1);
>  	/* See datasheet about PMECC Clock Control Register */
>  	pmecc_writel(host->ecc, CLK, 2);
>  	pmecc_writel(host->ecc, IDR, 0xff);
> @@ -1362,12 +1371,12 @@ static int atmel_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
>  {
>  	int eccsize = chip->ecc.size;
>  	int eccbytes = chip->ecc.bytes;
> -	uint32_t *eccpos = chip->ecc.layout->eccpos;
>  	uint8_t *p = buf;
>  	uint8_t *oob = chip->oob_poi;
>  	uint8_t *ecc_pos;
>  	int stat;
>  	unsigned int max_bitflips = 0;
> +	struct mtd_oob_region oobregion = {};
>  
>  	/*
>  	 * Errata: ALE is incorrectly wired up to the ECC controller
> @@ -1385,19 +1394,20 @@ static int atmel_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
>  	chip->read_buf(mtd, p, eccsize);
>  
>  	/* move to ECC position if needed */
> -	if (eccpos[0] != 0) {
> -		/* This only works on large pages
> -		 * because the ECC controller waits for
> -		 * NAND_CMD_RNDOUTSTART after the
> -		 * NAND_CMD_RNDOUT.
> -		 * anyway, for small pages, the eccpos[0] == 0
> +	mtd_ooblayout_ecc(mtd, 0, &oobregion);
> +	if (oobregion.offset != 0) {
> +		/*
> +		 * This only works on large pages because the ECC controller
> +		 * waits for NAND_CMD_RNDOUTSTART after the NAND_CMD_RNDOUT.
> +		 * Anyway, for small pages, the first ECC byte is at offset
> +		 * 0 in the OOB area.
>  		 */
>  		chip->cmdfunc(mtd, NAND_CMD_RNDOUT,
> -				mtd->writesize + eccpos[0], -1);
> +			      mtd->writesize + oobregion.offset, -1);
>  	}
>  
>  	/* the ECC controller needs to read the ECC just after the data */
> -	ecc_pos = oob + eccpos[0];
> +	ecc_pos = oob + oobregion.offset;
>  	chip->read_buf(mtd, ecc_pos, eccbytes);
>  
>  	/* check if there's an error */
> 


-- 
Nicolas Ferre

[PATCH v5 04/50] mtd: nand: atmel: use mtd_ooblayout_xxx() helpers where appropriate

[Nicolas Ferre]

Le 30/03/2016 18:14, Boris Brezillon a ?crit :
> The mtd_ooblayout_xxx() helper functions have been added to avoid direct
> accesses to the ecclayout field, and thus ease for future reworks.
> Use these helpers in all places where the oobfree[] and eccpos[] arrays
> where directly accessed.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
> ---
>  drivers/mtd/nand/atmel_nand.c | 48 ++++++++++++++++++++++++++-----------------
>  1 file changed, 29 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
> index 0b5da72..321d331 100644
> --- a/drivers/mtd/nand/atmel_nand.c
> +++ b/drivers/mtd/nand/atmel_nand.c
> @@ -836,13 +836,16 @@ static void pmecc_correct_data(struct mtd_info *mtd, uint8_t *buf, uint8_t *ecc,
>  			dev_dbg(host->dev, "Bit flip in data area, byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
>  				pos, bit_pos, err_byte, *(buf + byte_pos));
>  		} else {
> +			struct mtd_oob_region oobregion;
> +
>  			/* Bit flip in OOB area */
>  			tmp = sector_num * nand_chip->ecc.bytes
>  					+ (byte_pos - sector_size);
>  			err_byte = ecc[tmp];
>  			ecc[tmp] ^= (1 << bit_pos);
>  
> -			pos = tmp + nand_chip->ecc.layout->eccpos[0];
> +			mtd_ooblayout_ecc(mtd, 0, &oobregion);
> +			pos = tmp + oobregion.offset;
>  			dev_dbg(host->dev, "Bit flip in OOB, oob_byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
>  				pos, bit_pos, err_byte, ecc[tmp]);
>  		}
> @@ -934,7 +937,6 @@ static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
>  	struct atmel_nand_host *host = nand_get_controller_data(chip);
>  	int eccsize = chip->ecc.size * chip->ecc.steps;
>  	uint8_t *oob = chip->oob_poi;
> -	uint32_t *eccpos = chip->ecc.layout->eccpos;
>  	uint32_t stat;
>  	unsigned long end_time;
>  	int bitflips = 0;
> @@ -956,7 +958,11 @@ static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
>  
>  	stat = pmecc_readl_relaxed(host->ecc, ISR);
>  	if (stat != 0) {
> -		bitflips = pmecc_correction(mtd, stat, buf, &oob[eccpos[0]]);
> +		struct mtd_oob_region oobregion;
> +
> +		mtd_ooblayout_ecc(mtd, 0, &oobregion);
> +		bitflips = pmecc_correction(mtd, stat, buf,
> +					    &oob[oobregion.offset]);
>  		if (bitflips < 0)
>  			/* uncorrectable errors */
>  			return 0;
> @@ -970,8 +976,8 @@ static int atmel_nand_pmecc_write_page(struct mtd_info *mtd,
>  		int page)
>  {
>  	struct atmel_nand_host *host = nand_get_controller_data(chip);
> -	uint32_t *eccpos = chip->ecc.layout->eccpos;
> -	int i, j;
> +	struct mtd_oob_region oobregion = { };
> +	int i, j, section = 0;
>  	unsigned long end_time;
>  
>  	if (!host->nfc || !host->nfc->write_by_sram) {
> @@ -990,11 +996,12 @@ static int atmel_nand_pmecc_write_page(struct mtd_info *mtd,
>  
>  	for (i = 0; i < chip->ecc.steps; i++) {
>  		for (j = 0; j < chip->ecc.bytes; j++) {
> -			int pos;
> +			if (!oobregion.length)
> +				mtd_ooblayout_ecc(mtd, section++, &oobregion);

Here...


>  
> -			pos = i * chip->ecc.bytes + j;
> -			chip->oob_poi[eccpos[pos]] =
> +			chip->oob_poi[oobregion.offset++] =

... and there, are you sure to increment the variable inside the
function call or the table index?

I must say that I don't like it at all.


>  				pmecc_readb_ecc_relaxed(host->ecc, i, j);
> +			oobregion.length--;

Simply do it here, it's so much easier to read and fool proof!


>  		}
>  	}
>  	chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
> @@ -1008,6 +1015,7 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
>  	struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
>  	uint32_t val = 0;
>  	struct nand_ecclayout *ecc_layout;
> +	struct mtd_oob_region oobregion;
>  
>  	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST);
>  	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DISABLE);
> @@ -1059,9 +1067,10 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
>  
>  	ecc_layout = nand_chip->ecc.layout;
>  	pmecc_writel(host->ecc, SAREA, mtd->oobsize - 1);
> -	pmecc_writel(host->ecc, SADDR, ecc_layout->eccpos[0]);
> +	mtd_ooblayout_ecc(mtd, 0, &oobregion);
> +	pmecc_writel(host->ecc, SADDR, oobregion.offset);
>  	pmecc_writel(host->ecc, EADDR,
> -			ecc_layout->eccpos[ecc_layout->eccbytes - 1]);
> +		     oobregion.offset + ecc_layout->eccbytes - 1);
>  	/* See datasheet about PMECC Clock Control Register */
>  	pmecc_writel(host->ecc, CLK, 2);
>  	pmecc_writel(host->ecc, IDR, 0xff);
> @@ -1362,12 +1371,12 @@ static int atmel_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
>  {
>  	int eccsize = chip->ecc.size;
>  	int eccbytes = chip->ecc.bytes;
> -	uint32_t *eccpos = chip->ecc.layout->eccpos;
>  	uint8_t *p = buf;
>  	uint8_t *oob = chip->oob_poi;
>  	uint8_t *ecc_pos;
>  	int stat;
>  	unsigned int max_bitflips = 0;
> +	struct mtd_oob_region oobregion = {};
>  
>  	/*
>  	 * Errata: ALE is incorrectly wired up to the ECC controller
> @@ -1385,19 +1394,20 @@ static int atmel_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
>  	chip->read_buf(mtd, p, eccsize);
>  
>  	/* move to ECC position if needed */
> -	if (eccpos[0] != 0) {
> -		/* This only works on large pages
> -		 * because the ECC controller waits for
> -		 * NAND_CMD_RNDOUTSTART after the
> -		 * NAND_CMD_RNDOUT.
> -		 * anyway, for small pages, the eccpos[0] == 0
> +	mtd_ooblayout_ecc(mtd, 0, &oobregion);
> +	if (oobregion.offset != 0) {
> +		/*
> +		 * This only works on large pages because the ECC controller
> +		 * waits for NAND_CMD_RNDOUTSTART after the NAND_CMD_RNDOUT.
> +		 * Anyway, for small pages, the first ECC byte is at offset
> +		 * 0 in the OOB area.
>  		 */
>  		chip->cmdfunc(mtd, NAND_CMD_RNDOUT,
> -				mtd->writesize + eccpos[0], -1);
> +			      mtd->writesize + oobregion.offset, -1);
>  	}
>  
>  	/* the ECC controller needs to read the ECC just after the data */
> -	ecc_pos = oob + eccpos[0];
> +	ecc_pos = oob + oobregion.offset;
>  	chip->read_buf(mtd, ecc_pos, eccbytes);
>  
>  	/* check if there's an error */
> 


-- 
Nicolas Ferre

[PATCH v6 04/50] mtd: nand: atmel: use mtd_ooblayout_xxx() helpers where appropriate

[Boris Brezillon]

The mtd_ooblayout_xxx() helper functions have been added to avoid direct
accesses to the ecclayout field, and thus ease for future reworks.
Use these helpers in all places where the oobfree[] and eccpos[] arrays
where directly accessed.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/atmel_nand.c | 50 +++++++++++++++++++++++++++----------------
 1 file changed, 31 insertions(+), 19 deletions(-)

diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
index 5e716f2..b132c8f 100644
--- a/drivers/mtd/nand/atmel_nand.c
+++ b/drivers/mtd/nand/atmel_nand.c
@@ -833,13 +833,16 @@ static void pmecc_correct_data(struct mtd_info *mtd, uint8_t *buf, uint8_t *ecc,
 			dev_dbg(host->dev, "Bit flip in data area, byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
 				pos, bit_pos, err_byte, *(buf + byte_pos));
 		} else {
+			struct mtd_oob_region oobregion;
+
 			/* Bit flip in OOB area */
 			tmp = sector_num * nand_chip->ecc.bytes
 					+ (byte_pos - sector_size);
 			err_byte = ecc[tmp];
 			ecc[tmp] ^= (1 << bit_pos);
 
-			pos = tmp + nand_chip->ecc.layout->eccpos[0];
+			mtd_ooblayout_ecc(mtd, 0, &oobregion);
+			pos = tmp + oobregion.offset;
 			dev_dbg(host->dev, "Bit flip in OOB, oob_byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
 				pos, bit_pos, err_byte, ecc[tmp]);
 		}
@@ -931,7 +934,6 @@ static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
 	struct atmel_nand_host *host = nand_get_controller_data(chip);
 	int eccsize = chip->ecc.size * chip->ecc.steps;
 	uint8_t *oob = chip->oob_poi;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
 	uint32_t stat;
 	unsigned long end_time;
 	int bitflips = 0;
@@ -953,7 +955,11 @@ static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
 
 	stat = pmecc_readl_relaxed(host->ecc, ISR);
 	if (stat != 0) {
-		bitflips = pmecc_correction(mtd, stat, buf, &oob[eccpos[0]]);
+		struct mtd_oob_region oobregion;
+
+		mtd_ooblayout_ecc(mtd, 0, &oobregion);
+		bitflips = pmecc_correction(mtd, stat, buf,
+					    &oob[oobregion.offset]);
 		if (bitflips < 0)
 			/* uncorrectable errors */
 			return 0;
@@ -967,8 +973,8 @@ static int atmel_nand_pmecc_write_page(struct mtd_info *mtd,
 		int page)
 {
 	struct atmel_nand_host *host = nand_get_controller_data(chip);
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
-	int i, j;
+	struct mtd_oob_region oobregion = { };
+	int i, j, section = 0;
 	unsigned long end_time;
 
 	if (!host->nfc || !host->nfc->write_by_sram) {
@@ -987,11 +993,14 @@ static int atmel_nand_pmecc_write_page(struct mtd_info *mtd,
 
 	for (i = 0; i < chip->ecc.steps; i++) {
 		for (j = 0; j < chip->ecc.bytes; j++) {
-			int pos;
+			if (!oobregion.length)
+				mtd_ooblayout_ecc(mtd, section, &oobregion);
 
-			pos = i * chip->ecc.bytes + j;
-			chip->oob_poi[eccpos[pos]] =
+			chip->oob_poi[oobregion.offset] =
 				pmecc_readb_ecc_relaxed(host->ecc, i, j);
+			oobregion.length--;
+			oobregion.offset++;
+			section++;
 		}
 	}
 	chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
@@ -1005,6 +1014,7 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
 	struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
 	uint32_t val = 0;
 	struct nand_ecclayout *ecc_layout;
+	struct mtd_oob_region oobregion;
 
 	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST);
 	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DISABLE);
@@ -1056,9 +1066,10 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
 
 	ecc_layout = nand_chip->ecc.layout;
 	pmecc_writel(host->ecc, SAREA, mtd->oobsize - 1);
-	pmecc_writel(host->ecc, SADDR, ecc_layout->eccpos[0]);
+	mtd_ooblayout_ecc(mtd, 0, &oobregion);
+	pmecc_writel(host->ecc, SADDR, oobregion.offset);
 	pmecc_writel(host->ecc, EADDR,
-			ecc_layout->eccpos[ecc_layout->eccbytes - 1]);
+		     oobregion.offset + ecc_layout->eccbytes - 1);
 	/* See datasheet about PMECC Clock Control Register */
 	pmecc_writel(host->ecc, CLK, 2);
 	pmecc_writel(host->ecc, IDR, 0xff);
@@ -1359,12 +1370,12 @@ static int atmel_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
 {
 	int eccsize = chip->ecc.size;
 	int eccbytes = chip->ecc.bytes;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
 	uint8_t *p = buf;
 	uint8_t *oob = chip->oob_poi;
 	uint8_t *ecc_pos;
 	int stat;
 	unsigned int max_bitflips = 0;
+	struct mtd_oob_region oobregion = {};
 
 	/*
 	 * Errata: ALE is incorrectly wired up to the ECC controller
@@ -1382,19 +1393,20 @@ static int atmel_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
 	chip->read_buf(mtd, p, eccsize);
 
 	/* move to ECC position if needed */
-	if (eccpos[0] != 0) {
-		/* This only works on large pages
-		 * because the ECC controller waits for
-		 * NAND_CMD_RNDOUTSTART after the
-		 * NAND_CMD_RNDOUT.
-		 * anyway, for small pages, the eccpos[0] == 0
+	mtd_ooblayout_ecc(mtd, 0, &oobregion);
+	if (oobregion.offset != 0) {
+		/*
+		 * This only works on large pages because the ECC controller
+		 * waits for NAND_CMD_RNDOUTSTART after the NAND_CMD_RNDOUT.
+		 * Anyway, for small pages, the first ECC byte is at offset
+		 * 0 in the OOB area.
 		 */
 		chip->cmdfunc(mtd, NAND_CMD_RNDOUT,
-				mtd->writesize + eccpos[0], -1);
+			      mtd->writesize + oobregion.offset, -1);
 	}
 
 	/* the ECC controller needs to read the ECC just after the data */
-	ecc_pos = oob + eccpos[0];
+	ecc_pos = oob + oobregion.offset;
 	chip->read_buf(mtd, ecc_pos, eccbytes);
 
 	/* check if there's an error */
-- 
2.5.0

[PATCH v6 04/50] mtd: nand: atmel: use mtd_ooblayout_xxx() helpers where appropriate

[Boris Brezillon]

The mtd_ooblayout_xxx() helper functions have been added to avoid direct
accesses to the ecclayout field, and thus ease for future reworks.
Use these helpers in all places where the oobfree[] and eccpos[] arrays
where directly accessed.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
 drivers/mtd/nand/atmel_nand.c | 50 +++++++++++++++++++++++++++----------------
 1 file changed, 31 insertions(+), 19 deletions(-)

diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
index 5e716f2..b132c8f 100644
--- a/drivers/mtd/nand/atmel_nand.c
+++ b/drivers/mtd/nand/atmel_nand.c
@@ -833,13 +833,16 @@ static void pmecc_correct_data(struct mtd_info *mtd, uint8_t *buf, uint8_t *ecc,
 			dev_dbg(host->dev, "Bit flip in data area, byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
 				pos, bit_pos, err_byte, *(buf + byte_pos));
 		} else {
+			struct mtd_oob_region oobregion;
+
 			/* Bit flip in OOB area */
 			tmp = sector_num * nand_chip->ecc.bytes
 					+ (byte_pos - sector_size);
 			err_byte = ecc[tmp];
 			ecc[tmp] ^= (1 << bit_pos);
 
-			pos = tmp + nand_chip->ecc.layout->eccpos[0];
+			mtd_ooblayout_ecc(mtd, 0, &oobregion);
+			pos = tmp + oobregion.offset;
 			dev_dbg(host->dev, "Bit flip in OOB, oob_byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
 				pos, bit_pos, err_byte, ecc[tmp]);
 		}
@@ -931,7 +934,6 @@ static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
 	struct atmel_nand_host *host = nand_get_controller_data(chip);
 	int eccsize = chip->ecc.size * chip->ecc.steps;
 	uint8_t *oob = chip->oob_poi;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
 	uint32_t stat;
 	unsigned long end_time;
 	int bitflips = 0;
@@ -953,7 +955,11 @@ static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
 
 	stat = pmecc_readl_relaxed(host->ecc, ISR);
 	if (stat != 0) {
-		bitflips = pmecc_correction(mtd, stat, buf, &oob[eccpos[0]]);
+		struct mtd_oob_region oobregion;
+
+		mtd_ooblayout_ecc(mtd, 0, &oobregion);
+		bitflips = pmecc_correction(mtd, stat, buf,
+					    &oob[oobregion.offset]);
 		if (bitflips < 0)
 			/* uncorrectable errors */
 			return 0;
@@ -967,8 +973,8 @@ static int atmel_nand_pmecc_write_page(struct mtd_info *mtd,
 		int page)
 {
 	struct atmel_nand_host *host = nand_get_controller_data(chip);
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
-	int i, j;
+	struct mtd_oob_region oobregion = { };
+	int i, j, section = 0;
 	unsigned long end_time;
 
 	if (!host->nfc || !host->nfc->write_by_sram) {
@@ -987,11 +993,14 @@ static int atmel_nand_pmecc_write_page(struct mtd_info *mtd,
 
 	for (i = 0; i < chip->ecc.steps; i++) {
 		for (j = 0; j < chip->ecc.bytes; j++) {
-			int pos;
+			if (!oobregion.length)
+				mtd_ooblayout_ecc(mtd, section, &oobregion);
 
-			pos = i * chip->ecc.bytes + j;
-			chip->oob_poi[eccpos[pos]] =
+			chip->oob_poi[oobregion.offset] =
 				pmecc_readb_ecc_relaxed(host->ecc, i, j);
+			oobregion.length--;
+			oobregion.offset++;
+			section++;
 		}
 	}
 	chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
@@ -1005,6 +1014,7 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
 	struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
 	uint32_t val = 0;
 	struct nand_ecclayout *ecc_layout;
+	struct mtd_oob_region oobregion;
 
 	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST);
 	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DISABLE);
@@ -1056,9 +1066,10 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
 
 	ecc_layout = nand_chip->ecc.layout;
 	pmecc_writel(host->ecc, SAREA, mtd->oobsize - 1);
-	pmecc_writel(host->ecc, SADDR, ecc_layout->eccpos[0]);
+	mtd_ooblayout_ecc(mtd, 0, &oobregion);
+	pmecc_writel(host->ecc, SADDR, oobregion.offset);
 	pmecc_writel(host->ecc, EADDR,
-			ecc_layout->eccpos[ecc_layout->eccbytes - 1]);
+		     oobregion.offset + ecc_layout->eccbytes - 1);
 	/* See datasheet about PMECC Clock Control Register */
 	pmecc_writel(host->ecc, CLK, 2);
 	pmecc_writel(host->ecc, IDR, 0xff);
@@ -1359,12 +1370,12 @@ static int atmel_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
 {
 	int eccsize = chip->ecc.size;
 	int eccbytes = chip->ecc.bytes;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
 	uint8_t *p = buf;
 	uint8_t *oob = chip->oob_poi;
 	uint8_t *ecc_pos;
 	int stat;
 	unsigned int max_bitflips = 0;
+	struct mtd_oob_region oobregion = {};
 
 	/*
 	 * Errata: ALE is incorrectly wired up to the ECC controller
@@ -1382,19 +1393,20 @@ static int atmel_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
 	chip->read_buf(mtd, p, eccsize);
 
 	/* move to ECC position if needed */
-	if (eccpos[0] != 0) {
-		/* This only works on large pages
-		 * because the ECC controller waits for
-		 * NAND_CMD_RNDOUTSTART after the
-		 * NAND_CMD_RNDOUT.
-		 * anyway, for small pages, the eccpos[0] == 0
+	mtd_ooblayout_ecc(mtd, 0, &oobregion);
+	if (oobregion.offset != 0) {
+		/*
+		 * This only works on large pages because the ECC controller
+		 * waits for NAND_CMD_RNDOUTSTART after the NAND_CMD_RNDOUT.
+		 * Anyway, for small pages, the first ECC byte is at offset
+		 * 0 in the OOB area.
 		 */
 		chip->cmdfunc(mtd, NAND_CMD_RNDOUT,
-				mtd->writesize + eccpos[0], -1);
+			      mtd->writesize + oobregion.offset, -1);
 	}
 
 	/* the ECC controller needs to read the ECC just after the data */
-	ecc_pos = oob + eccpos[0];
+	ecc_pos = oob + oobregion.offset;
 	chip->read_buf(mtd, ecc_pos, eccbytes);
 
 	/* check if there's an error */
-- 
2.5.0

Re: [PATCH v6 04/50] mtd: nand: atmel: use mtd_ooblayout_xxx() helpers where appropriate

[Nicolas Ferre]

Le 13/04/2016 17:53, Boris Brezillon a écrit :
> The mtd_ooblayout_xxx() helper functions have been added to avoid direct
> accesses to the ecclayout field, and thus ease for future reworks.
> Use these helpers in all places where the oobfree[] and eccpos[] arrays
> where directly accessed.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>

Thanks for the quick rework Boris!

Reviewed-by: Nicolas Ferre <nicolas.ferre@atmel.com>

> ---
>  drivers/mtd/nand/atmel_nand.c | 50 +++++++++++++++++++++++++++----------------
>  1 file changed, 31 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
> index 5e716f2..b132c8f 100644
> --- a/drivers/mtd/nand/atmel_nand.c
> +++ b/drivers/mtd/nand/atmel_nand.c
> @@ -833,13 +833,16 @@ static void pmecc_correct_data(struct mtd_info *mtd, uint8_t *buf, uint8_t *ecc,
>  			dev_dbg(host->dev, "Bit flip in data area, byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
>  				pos, bit_pos, err_byte, *(buf + byte_pos));
>  		} else {
> +			struct mtd_oob_region oobregion;
> +
>  			/* Bit flip in OOB area */
>  			tmp = sector_num * nand_chip->ecc.bytes
>  					+ (byte_pos - sector_size);
>  			err_byte = ecc[tmp];
>  			ecc[tmp] ^= (1 << bit_pos);
>  
> -			pos = tmp + nand_chip->ecc.layout->eccpos[0];
> +			mtd_ooblayout_ecc(mtd, 0, &oobregion);
> +			pos = tmp + oobregion.offset;
>  			dev_dbg(host->dev, "Bit flip in OOB, oob_byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
>  				pos, bit_pos, err_byte, ecc[tmp]);
>  		}
> @@ -931,7 +934,6 @@ static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
>  	struct atmel_nand_host *host = nand_get_controller_data(chip);
>  	int eccsize = chip->ecc.size * chip->ecc.steps;
>  	uint8_t *oob = chip->oob_poi;
> -	uint32_t *eccpos = chip->ecc.layout->eccpos;
>  	uint32_t stat;
>  	unsigned long end_time;
>  	int bitflips = 0;
> @@ -953,7 +955,11 @@ static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
>  
>  	stat = pmecc_readl_relaxed(host->ecc, ISR);
>  	if (stat != 0) {
> -		bitflips = pmecc_correction(mtd, stat, buf, &oob[eccpos[0]]);
> +		struct mtd_oob_region oobregion;
> +
> +		mtd_ooblayout_ecc(mtd, 0, &oobregion);
> +		bitflips = pmecc_correction(mtd, stat, buf,
> +					    &oob[oobregion.offset]);
>  		if (bitflips < 0)
>  			/* uncorrectable errors */
>  			return 0;
> @@ -967,8 +973,8 @@ static int atmel_nand_pmecc_write_page(struct mtd_info *mtd,
>  		int page)
>  {
>  	struct atmel_nand_host *host = nand_get_controller_data(chip);
> -	uint32_t *eccpos = chip->ecc.layout->eccpos;
> -	int i, j;
> +	struct mtd_oob_region oobregion = { };
> +	int i, j, section = 0;
>  	unsigned long end_time;
>  
>  	if (!host->nfc || !host->nfc->write_by_sram) {
> @@ -987,11 +993,14 @@ static int atmel_nand_pmecc_write_page(struct mtd_info *mtd,
>  
>  	for (i = 0; i < chip->ecc.steps; i++) {
>  		for (j = 0; j < chip->ecc.bytes; j++) {
> -			int pos;
> +			if (!oobregion.length)
> +				mtd_ooblayout_ecc(mtd, section, &oobregion);
>  
> -			pos = i * chip->ecc.bytes + j;
> -			chip->oob_poi[eccpos[pos]] =
> +			chip->oob_poi[oobregion.offset] =
>  				pmecc_readb_ecc_relaxed(host->ecc, i, j);
> +			oobregion.length--;
> +			oobregion.offset++;
> +			section++;
>  		}
>  	}
>  	chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
> @@ -1005,6 +1014,7 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
>  	struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
>  	uint32_t val = 0;
>  	struct nand_ecclayout *ecc_layout;
> +	struct mtd_oob_region oobregion;
>  
>  	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST);
>  	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DISABLE);
> @@ -1056,9 +1066,10 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
>  
>  	ecc_layout = nand_chip->ecc.layout;
>  	pmecc_writel(host->ecc, SAREA, mtd->oobsize - 1);
> -	pmecc_writel(host->ecc, SADDR, ecc_layout->eccpos[0]);
> +	mtd_ooblayout_ecc(mtd, 0, &oobregion);
> +	pmecc_writel(host->ecc, SADDR, oobregion.offset);
>  	pmecc_writel(host->ecc, EADDR,
> -			ecc_layout->eccpos[ecc_layout->eccbytes - 1]);
> +		     oobregion.offset + ecc_layout->eccbytes - 1);
>  	/* See datasheet about PMECC Clock Control Register */
>  	pmecc_writel(host->ecc, CLK, 2);
>  	pmecc_writel(host->ecc, IDR, 0xff);
> @@ -1359,12 +1370,12 @@ static int atmel_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
>  {
>  	int eccsize = chip->ecc.size;
>  	int eccbytes = chip->ecc.bytes;
> -	uint32_t *eccpos = chip->ecc.layout->eccpos;
>  	uint8_t *p = buf;
>  	uint8_t *oob = chip->oob_poi;
>  	uint8_t *ecc_pos;
>  	int stat;
>  	unsigned int max_bitflips = 0;
> +	struct mtd_oob_region oobregion = {};
>  
>  	/*
>  	 * Errata: ALE is incorrectly wired up to the ECC controller
> @@ -1382,19 +1393,20 @@ static int atmel_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
>  	chip->read_buf(mtd, p, eccsize);
>  
>  	/* move to ECC position if needed */
> -	if (eccpos[0] != 0) {
> -		/* This only works on large pages
> -		 * because the ECC controller waits for
> -		 * NAND_CMD_RNDOUTSTART after the
> -		 * NAND_CMD_RNDOUT.
> -		 * anyway, for small pages, the eccpos[0] == 0
> +	mtd_ooblayout_ecc(mtd, 0, &oobregion);
> +	if (oobregion.offset != 0) {
> +		/*
> +		 * This only works on large pages because the ECC controller
> +		 * waits for NAND_CMD_RNDOUTSTART after the NAND_CMD_RNDOUT.
> +		 * Anyway, for small pages, the first ECC byte is at offset
> +		 * 0 in the OOB area.
>  		 */
>  		chip->cmdfunc(mtd, NAND_CMD_RNDOUT,
> -				mtd->writesize + eccpos[0], -1);
> +			      mtd->writesize + oobregion.offset, -1);
>  	}
>  
>  	/* the ECC controller needs to read the ECC just after the data */
> -	ecc_pos = oob + eccpos[0];
> +	ecc_pos = oob + oobregion.offset;
>  	chip->read_buf(mtd, ecc_pos, eccbytes);
>  
>  	/* check if there's an error */
> 


-- 
Nicolas Ferre

[PATCH v6 04/50] mtd: nand: atmel: use mtd_ooblayout_xxx() helpers where appropriate

[Nicolas Ferre]

Le 13/04/2016 17:53, Boris Brezillon a ?crit :
> The mtd_ooblayout_xxx() helper functions have been added to avoid direct
> accesses to the ecclayout field, and thus ease for future reworks.
> Use these helpers in all places where the oobfree[] and eccpos[] arrays
> where directly accessed.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>

Thanks for the quick rework Boris!

Reviewed-by: Nicolas Ferre <nicolas.ferre@atmel.com>

> ---
>  drivers/mtd/nand/atmel_nand.c | 50 +++++++++++++++++++++++++++----------------
>  1 file changed, 31 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
> index 5e716f2..b132c8f 100644
> --- a/drivers/mtd/nand/atmel_nand.c
> +++ b/drivers/mtd/nand/atmel_nand.c
> @@ -833,13 +833,16 @@ static void pmecc_correct_data(struct mtd_info *mtd, uint8_t *buf, uint8_t *ecc,
>  			dev_dbg(host->dev, "Bit flip in data area, byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
>  				pos, bit_pos, err_byte, *(buf + byte_pos));
>  		} else {
> +			struct mtd_oob_region oobregion;
> +
>  			/* Bit flip in OOB area */
>  			tmp = sector_num * nand_chip->ecc.bytes
>  					+ (byte_pos - sector_size);
>  			err_byte = ecc[tmp];
>  			ecc[tmp] ^= (1 << bit_pos);
>  
> -			pos = tmp + nand_chip->ecc.layout->eccpos[0];
> +			mtd_ooblayout_ecc(mtd, 0, &oobregion);
> +			pos = tmp + oobregion.offset;
>  			dev_dbg(host->dev, "Bit flip in OOB, oob_byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
>  				pos, bit_pos, err_byte, ecc[tmp]);
>  		}
> @@ -931,7 +934,6 @@ static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
>  	struct atmel_nand_host *host = nand_get_controller_data(chip);
>  	int eccsize = chip->ecc.size * chip->ecc.steps;
>  	uint8_t *oob = chip->oob_poi;
> -	uint32_t *eccpos = chip->ecc.layout->eccpos;
>  	uint32_t stat;
>  	unsigned long end_time;
>  	int bitflips = 0;
> @@ -953,7 +955,11 @@ static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
>  
>  	stat = pmecc_readl_relaxed(host->ecc, ISR);
>  	if (stat != 0) {
> -		bitflips = pmecc_correction(mtd, stat, buf, &oob[eccpos[0]]);
> +		struct mtd_oob_region oobregion;
> +
> +		mtd_ooblayout_ecc(mtd, 0, &oobregion);
> +		bitflips = pmecc_correction(mtd, stat, buf,
> +					    &oob[oobregion.offset]);
>  		if (bitflips < 0)
>  			/* uncorrectable errors */
>  			return 0;
> @@ -967,8 +973,8 @@ static int atmel_nand_pmecc_write_page(struct mtd_info *mtd,
>  		int page)
>  {
>  	struct atmel_nand_host *host = nand_get_controller_data(chip);
> -	uint32_t *eccpos = chip->ecc.layout->eccpos;
> -	int i, j;
> +	struct mtd_oob_region oobregion = { };
> +	int i, j, section = 0;
>  	unsigned long end_time;
>  
>  	if (!host->nfc || !host->nfc->write_by_sram) {
> @@ -987,11 +993,14 @@ static int atmel_nand_pmecc_write_page(struct mtd_info *mtd,
>  
>  	for (i = 0; i < chip->ecc.steps; i++) {
>  		for (j = 0; j < chip->ecc.bytes; j++) {
> -			int pos;
> +			if (!oobregion.length)
> +				mtd_ooblayout_ecc(mtd, section, &oobregion);
>  
> -			pos = i * chip->ecc.bytes + j;
> -			chip->oob_poi[eccpos[pos]] =
> +			chip->oob_poi[oobregion.offset] =
>  				pmecc_readb_ecc_relaxed(host->ecc, i, j);
> +			oobregion.length--;
> +			oobregion.offset++;
> +			section++;
>  		}
>  	}
>  	chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
> @@ -1005,6 +1014,7 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
>  	struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
>  	uint32_t val = 0;
>  	struct nand_ecclayout *ecc_layout;
> +	struct mtd_oob_region oobregion;
>  
>  	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST);
>  	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DISABLE);
> @@ -1056,9 +1066,10 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
>  
>  	ecc_layout = nand_chip->ecc.layout;
>  	pmecc_writel(host->ecc, SAREA, mtd->oobsize - 1);
> -	pmecc_writel(host->ecc, SADDR, ecc_layout->eccpos[0]);
> +	mtd_ooblayout_ecc(mtd, 0, &oobregion);
> +	pmecc_writel(host->ecc, SADDR, oobregion.offset);
>  	pmecc_writel(host->ecc, EADDR,
> -			ecc_layout->eccpos[ecc_layout->eccbytes - 1]);
> +		     oobregion.offset + ecc_layout->eccbytes - 1);
>  	/* See datasheet about PMECC Clock Control Register */
>  	pmecc_writel(host->ecc, CLK, 2);
>  	pmecc_writel(host->ecc, IDR, 0xff);
> @@ -1359,12 +1370,12 @@ static int atmel_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
>  {
>  	int eccsize = chip->ecc.size;
>  	int eccbytes = chip->ecc.bytes;
> -	uint32_t *eccpos = chip->ecc.layout->eccpos;
>  	uint8_t *p = buf;
>  	uint8_t *oob = chip->oob_poi;
>  	uint8_t *ecc_pos;
>  	int stat;
>  	unsigned int max_bitflips = 0;
> +	struct mtd_oob_region oobregion = {};
>  
>  	/*
>  	 * Errata: ALE is incorrectly wired up to the ECC controller
> @@ -1382,19 +1393,20 @@ static int atmel_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
>  	chip->read_buf(mtd, p, eccsize);
>  
>  	/* move to ECC position if needed */
> -	if (eccpos[0] != 0) {
> -		/* This only works on large pages
> -		 * because the ECC controller waits for
> -		 * NAND_CMD_RNDOUTSTART after the
> -		 * NAND_CMD_RNDOUT.
> -		 * anyway, for small pages, the eccpos[0] == 0
> +	mtd_ooblayout_ecc(mtd, 0, &oobregion);
> +	if (oobregion.offset != 0) {
> +		/*
> +		 * This only works on large pages because the ECC controller
> +		 * waits for NAND_CMD_RNDOUTSTART after the NAND_CMD_RNDOUT.
> +		 * Anyway, for small pages, the first ECC byte is at offset
> +		 * 0 in the OOB area.
>  		 */
>  		chip->cmdfunc(mtd, NAND_CMD_RNDOUT,
> -				mtd->writesize + eccpos[0], -1);
> +			      mtd->writesize + oobregion.offset, -1);
>  	}
>  
>  	/* the ECC controller needs to read the ECC just after the data */
> -	ecc_pos = oob + eccpos[0];
> +	ecc_pos = oob + oobregion.offset;
>  	chip->read_buf(mtd, ecc_pos, eccbytes);
>  
>  	/* check if there's an error */
> 


-- 
Nicolas Ferre

Re: [PATCH v5 00/52] mtd: rework ECC layout definition

[Boris Brezillon]

On Wed, 30 Mar 2016 18:14:15 +0200
Boris Brezillon <boris.brezillon@free-electrons.com> wrote:

> Hello,
> 
> Hopefully the last version of this patchset (but don't be sad, I'm not
> done bothering you with NAND related patches :-)).
> 
> If possible, I'd like to have as much Tested/Reviewed/Acked-by tags as
> possible, particularly on the changes done in arch/arm and arch/mips
> (since the last set of commits depends on those changes, I'd like to
> take them in my nand/next branch, even if this imply creating an
> immutable branch for the ARM and MIPS maintainers).

It's been around for quite some time now, and got several
Acked/Tested/Reviewed-by tags. Let's push that on nand/next and see if
someone complains in which case I drop those patches before sending my
PR to Brian.

Thanks for your reviews.

Boris


-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

Re: [PATCH v5 00/52] mtd: rework ECC layout definition

[Boris Brezillon]

On Wed, 30 Mar 2016 18:14:15 +0200
Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org> wrote:

> Hello,
> 
> Hopefully the last version of this patchset (but don't be sad, I'm not
> done bothering you with NAND related patches :-)).
> 
> If possible, I'd like to have as much Tested/Reviewed/Acked-by tags as
> possible, particularly on the changes done in arch/arm and arch/mips
> (since the last set of commits depends on those changes, I'd like to
> take them in my nand/next branch, even if this imply creating an
> immutable branch for the ARM and MIPS maintainers).

It's been around for quite some time now, and got several
Acked/Tested/Reviewed-by tags. Let's push that on nand/next and see if
someone complains in which case I drop those patches before sending my
PR to Brian.

Thanks for your reviews.

Boris


-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

[PATCH v5 00/52] mtd: rework ECC layout definition

[Boris Brezillon]

On Wed, 30 Mar 2016 18:14:15 +0200
Boris Brezillon <boris.brezillon@free-electrons.com> wrote:

> Hello,
> 
> Hopefully the last version of this patchset (but don't be sad, I'm not
> done bothering you with NAND related patches :-)).
> 
> If possible, I'd like to have as much Tested/Reviewed/Acked-by tags as
> possible, particularly on the changes done in arch/arm and arch/mips
> (since the last set of commits depends on those changes, I'd like to
> take them in my nand/next branch, even if this imply creating an
> immutable branch for the ARM and MIPS maintainers).

It's been around for quite some time now, and got several
Acked/Tested/Reviewed-by tags. Let's push that on nand/next and see if
someone complains in which case I drop those patches before sending my
PR to Brian.

Thanks for your reviews.

Boris


-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

Re: [PATCH v5 39/50] mtd: nand: omap2: switch to mtd_ooblayout_ops

[Roger Quadros]

Boris,

On 30/03/16 19:14, Boris Brezillon wrote:
> Implementing the mtd_ooblayout_ops interface is the new way of exposing
> ECC/OOB layout to MTD users.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
> ---
>  drivers/mtd/nand/omap2.c | 194 +++++++++++++++++++++++++++--------------------
>  1 file changed, 113 insertions(+), 81 deletions(-)
> 
> diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
> index 4ebf16b..bca154a 100644
> --- a/drivers/mtd/nand/omap2.c
> +++ b/drivers/mtd/nand/omap2.c
> @@ -169,8 +169,6 @@ struct omap_nand_info {
>  	u_char				*buf;
>  	int					buf_len;
>  	struct gpmc_nand_regs		reg;
> -	/* generated at runtime depending on ECC algorithm and layout selected */
> -	struct nand_ecclayout		oobinfo;
>  	/* fields specific for BCHx_HW ECC scheme */
>  	struct device			*elm_dev;
>  	struct device_node		*of_node;
> @@ -1639,19 +1637,108 @@ static bool omap2_nand_ecc_check(struct omap_nand_info *info,
>  	return true;
>  }
>  
> +static int omap_ooblayout_ecc(struct mtd_info *mtd, int section,
> +			      struct mtd_oob_region *oobregion)
> +{
> +	struct nand_chip *chip = mtd_to_nand(mtd);
> +	int off = chip->options & NAND_BUSWIDTH_16 ?
> +		  BADBLOCK_MARKER_LENGTH : 1;

IMO "off = 1" is valid only for OMAP_ECC_HAM1_CODE_HW and 8-bit NAND.
For all other layouts it is always set to BADBLOCK_MARKER_LENGTH.

> +
> +	if (section)
> +		return -ERANGE;
> +
> +	oobregion->offset = off;
> +	oobregion->length = chip->ecc.total;
> +
> +	return 0;
> +}
> +
> +static int omap_ooblayout_free(struct mtd_info *mtd, int section,
> +			       struct mtd_oob_region *oobregion)
> +{
> +	struct nand_chip *chip = mtd_to_nand(mtd);
> +	int off = chip->options & NAND_BUSWIDTH_16 ?
> +		  BADBLOCK_MARKER_LENGTH : 1;

ditto.

> +
> +	if (section)
> +		return -ERANGE;
> +
> +	off += chip->ecc.total;
> +	if (off >= mtd->oobsize)
> +		return -ERANGE;
> +
> +	oobregion->offset = off;
> +	oobregion->length = mtd->oobsize - off;
> +
> +	return 0;
> +}
> +
> +static const struct mtd_ooblayout_ops omap_ooblayout_ops = {
> +	.ecc = omap_ooblayout_ecc,
> +	.free = omap_ooblayout_free,
> +};
> +
> +static int omap_sw_ooblayout_ecc(struct mtd_info *mtd, int section,
> +				 struct mtd_oob_region *oobregion)
> +{
> +	struct nand_chip *chip = mtd_to_nand(mtd);
> +	int off = chip->options & NAND_BUSWIDTH_16 ?
> +		  BADBLOCK_MARKER_LENGTH : 1;
> +
> +	if (section >= chip->ecc.steps)
> +		return -ERANGE;
> +
> +	/*
> +	 * When SW correction is employed, one OMAP specific marker byte is
> +	 * reserved after each ECC step.
> +	 */
> +	oobregion->offset = off + (section * (chip->ecc.bytes + 1));
> +	oobregion->length = chip->ecc.bytes;
> +
> +	return 0;
> +}
> +
> +static int omap_sw_ooblayout_free(struct mtd_info *mtd, int section,
> +				  struct mtd_oob_region *oobregion)
> +{
> +	struct nand_chip *chip = mtd_to_nand(mtd);
> +	int off = chip->options & NAND_BUSWIDTH_16 ?
> +		  BADBLOCK_MARKER_LENGTH : 1;
> +
> +	if (section)
> +		return -ERANGE;
> +
> +	/*
> +	 * When SW correction is employed, one OMAP specific marker byte is
> +	 * reserved after each ECC step.
> +	 */
> +	off += ((chip->ecc.bytes + 1) * chip->ecc.steps);
> +	if (off >= mtd->oobsize)
> +		return -ERANGE;
> +
> +	oobregion->offset = off;
> +	oobregion->length = mtd->oobsize - off;
> +
> +	return 0;
> +}
> +
> +static const struct mtd_ooblayout_ops omap_sw_ooblayout_ops = {
> +	.ecc = omap_sw_ooblayout_ecc,
> +	.free = omap_sw_ooblayout_free,
> +};
> +
>  static int omap_nand_probe(struct platform_device *pdev)
>  {
>  	struct omap_nand_info		*info;
>  	struct omap_nand_platform_data	*pdata;
>  	struct mtd_info			*mtd;
>  	struct nand_chip		*nand_chip;
> -	struct nand_ecclayout		*ecclayout;
>  	int				err;
> -	int				i;
>  	dma_cap_mask_t			mask;
>  	unsigned			sig;
> -	unsigned			oob_index;
>  	struct resource			*res;
> +	int				min_oobbytes;
> +	int				oobbytes_per_step;
>  
>  	pdata = dev_get_platdata(&pdev->dev);
>  	if (pdata == NULL) {
> @@ -1810,7 +1897,7 @@ static int omap_nand_probe(struct platform_device *pdev)
>  
>  	/*
>  	 * Bail out earlier to let NAND_ECC_SOFT code create its own
> -	 * ecclayout instead of using ours.
> +	 * ooblayout instead of using ours.
>  	 */
>  	if (info->ecc_opt == OMAP_ECC_HAM1_CODE_SW) {
>  		nand_chip->ecc.mode = NAND_ECC_SOFT;
> @@ -1818,8 +1905,6 @@ static int omap_nand_probe(struct platform_device *pdev)
>  	}
>  
>  	/* populate MTD interface based on ECC scheme */
> -	ecclayout		= &info->oobinfo;
> -	nand_chip->ecc.layout	= ecclayout;
>  	switch (info->ecc_opt) {
>  	case OMAP_ECC_HAM1_CODE_HW:
>  		pr_info("nand: using OMAP_ECC_HAM1_CODE_HW\n");
> @@ -1830,19 +1915,8 @@ static int omap_nand_probe(struct platform_device *pdev)
>  		nand_chip->ecc.calculate        = omap_calculate_ecc;
>  		nand_chip->ecc.hwctl            = omap_enable_hwecc;
>  		nand_chip->ecc.correct          = omap_correct_data;
> -		/* define ECC layout */
> -		ecclayout->eccbytes		= nand_chip->ecc.bytes *
> -							(mtd->writesize /
> -							nand_chip->ecc.size);
> -		if (nand_chip->options & NAND_BUSWIDTH_16)
> -			oob_index		= BADBLOCK_MARKER_LENGTH;
> -		else
> -			oob_index		= 1;
> -		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++)
> -			ecclayout->eccpos[i]	= oob_index;
> -		/* no reserved-marker in ecclayout for this ecc-scheme */
> -		ecclayout->oobfree->offset	=
> -				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
> +		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
> +		oobbytes_per_step		= nand_chip->ecc.bytes;
>  		break;
>  
>  	case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
> @@ -1854,19 +1928,9 @@ static int omap_nand_probe(struct platform_device *pdev)
>  		nand_chip->ecc.hwctl		= omap_enable_hwecc_bch;
>  		nand_chip->ecc.correct		= nand_bch_correct_data;
>  		nand_chip->ecc.calculate	= omap_calculate_ecc_bch;
> -		/* define ECC layout */
> -		ecclayout->eccbytes		= nand_chip->ecc.bytes *
> -							(mtd->writesize /
> -							nand_chip->ecc.size);
> -		oob_index			= BADBLOCK_MARKER_LENGTH;
> -		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++) {
> -			ecclayout->eccpos[i] = oob_index;
> -			if (((i + 1) % nand_chip->ecc.bytes) == 0)
> -				oob_index++;
> -		}
> -		/* include reserved-marker in ecclayout->oobfree calculation */
> -		ecclayout->oobfree->offset	= 1 +
> -				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
> +		mtd_set_ooblayout(mtd, &omap_sw_ooblayout_ops);
> +		/* Reserve one byte for the OMAP marker */
> +		oobbytes_per_step		= nand_chip->ecc.bytes + 1;
>  		/* software bch library is used for locating errors */
>  		nand_chip->ecc.priv		= nand_bch_init(mtd);
>  		if (!nand_chip->ecc.priv) {
> @@ -1888,16 +1952,8 @@ static int omap_nand_probe(struct platform_device *pdev)
>  		nand_chip->ecc.calculate	= omap_calculate_ecc_bch;
>  		nand_chip->ecc.read_page	= omap_read_page_bch;
>  		nand_chip->ecc.write_page	= omap_write_page_bch;
> -		/* define ECC layout */
> -		ecclayout->eccbytes		= nand_chip->ecc.bytes *
> -							(mtd->writesize /
> -							nand_chip->ecc.size);
> -		oob_index			= BADBLOCK_MARKER_LENGTH;
> -		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++)
> -			ecclayout->eccpos[i]	= oob_index;
> -		/* reserved marker already included in ecclayout->eccbytes */
> -		ecclayout->oobfree->offset	=
> -				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
> +		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
> +		oobbytes_per_step		= nand_chip->ecc.bytes;
>  
>  		err = elm_config(info->elm_dev, BCH4_ECC,
>  				 mtd->writesize / nand_chip->ecc.size,
> @@ -1915,19 +1971,9 @@ static int omap_nand_probe(struct platform_device *pdev)
>  		nand_chip->ecc.hwctl		= omap_enable_hwecc_bch;
>  		nand_chip->ecc.correct		= nand_bch_correct_data;
>  		nand_chip->ecc.calculate	= omap_calculate_ecc_bch;
> -		/* define ECC layout */
> -		ecclayout->eccbytes		= nand_chip->ecc.bytes *
> -							(mtd->writesize /
> -							nand_chip->ecc.size);
> -		oob_index			= BADBLOCK_MARKER_LENGTH;
> -		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++) {
> -			ecclayout->eccpos[i] = oob_index;
> -			if (((i + 1) % nand_chip->ecc.bytes) == 0)
> -				oob_index++;
> -		}
> -		/* include reserved-marker in ecclayout->oobfree calculation */
> -		ecclayout->oobfree->offset	= 1 +
> -				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
> +		mtd_set_ooblayout(mtd, &omap_sw_ooblayout_ops);
> +		/* Reserve one byte for the OMAP marker */
> +		oobbytes_per_step		= nand_chip->ecc.bytes + 1;
>  		/* software bch library is used for locating errors */
>  		nand_chip->ecc.priv		= nand_bch_init(mtd);
>  		if (!nand_chip->ecc.priv) {
> @@ -1949,6 +1995,8 @@ static int omap_nand_probe(struct platform_device *pdev)
>  		nand_chip->ecc.calculate	= omap_calculate_ecc_bch;
>  		nand_chip->ecc.read_page	= omap_read_page_bch;
>  		nand_chip->ecc.write_page	= omap_write_page_bch;
> +		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
> +		oobbytes_per_step		= nand_chip->ecc.bytes;
>  
>  		err = elm_config(info->elm_dev, BCH8_ECC,
>  				 mtd->writesize / nand_chip->ecc.size,
> @@ -1956,16 +2004,6 @@ static int omap_nand_probe(struct platform_device *pdev)
>  		if (err < 0)
>  			goto return_error;
>  
> -		/* define ECC layout */
> -		ecclayout->eccbytes		= nand_chip->ecc.bytes *
> -							(mtd->writesize /
> -							nand_chip->ecc.size);
> -		oob_index			= BADBLOCK_MARKER_LENGTH;
> -		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++)
> -			ecclayout->eccpos[i]	= oob_index;
> -		/* reserved marker already included in ecclayout->eccbytes */
> -		ecclayout->oobfree->offset	=
> -				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
>  		break;
>  
>  	case OMAP_ECC_BCH16_CODE_HW:
> @@ -1979,6 +2017,8 @@ static int omap_nand_probe(struct platform_device *pdev)
>  		nand_chip->ecc.calculate	= omap_calculate_ecc_bch;
>  		nand_chip->ecc.read_page	= omap_read_page_bch;
>  		nand_chip->ecc.write_page	= omap_write_page_bch;
> +		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
> +		oobbytes_per_step		= nand_chip->ecc.bytes;
>  
>  		err = elm_config(info->elm_dev, BCH16_ECC,
>  				 mtd->writesize / nand_chip->ecc.size,
> @@ -1986,16 +2026,6 @@ static int omap_nand_probe(struct platform_device *pdev)
>  		if (err < 0)
>  			goto return_error;
>  
> -		/* define ECC layout */
> -		ecclayout->eccbytes		= nand_chip->ecc.bytes *
> -							(mtd->writesize /
> -							nand_chip->ecc.size);
> -		oob_index			= BADBLOCK_MARKER_LENGTH;
> -		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++)
> -			ecclayout->eccpos[i]	= oob_index;
> -		/* reserved marker already included in ecclayout->eccbytes */
> -		ecclayout->oobfree->offset	=
> -				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
>  		break;
>  	default:
>  		dev_err(&info->pdev->dev, "invalid or unsupported ECC scheme\n");
> @@ -2003,13 +2033,15 @@ static int omap_nand_probe(struct platform_device *pdev)
>  		goto return_error;
>  	}
>  
> -	/* all OOB bytes from oobfree->offset till end off OOB are free */
> -	ecclayout->oobfree->length = mtd->oobsize - ecclayout->oobfree->offset;
>  	/* check if NAND device's OOB is enough to store ECC signatures */
> -	if (mtd->oobsize < (ecclayout->eccbytes + BADBLOCK_MARKER_LENGTH)) {
> +	min_oobbytes = (oobbytes_per_step *
> +			(mtd->writesize / nand_chip->ecc.size)) +
> +		       (nand_chip->options & NAND_BUSWIDTH_16 ?
> +			BADBLOCK_MARKER_LENGTH : 1);

would it affect this as well?

> +	if (mtd->oobsize < min_oobbytes) {
>  		dev_err(&info->pdev->dev,
>  			"not enough OOB bytes required = %d, available=%d\n",
> -			ecclayout->eccbytes, mtd->oobsize);
> +			min_oobbytes, mtd->oobsize);
>  		err = -EINVAL;
>  		goto return_error;
>  	}
> 

I will need to test this change with all possible configurations.
The number of configurations on OMAP is a bit overwhelming :(.

cheers,
-roger

Re: [PATCH v5 39/50] mtd: nand: omap2: switch to mtd_ooblayout_ops

[Roger Quadros]

Boris,

On 30/03/16 19:14, Boris Brezillon wrote:
> Implementing the mtd_ooblayout_ops interface is the new way of exposing
> ECC/OOB layout to MTD users.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
> ---
>  drivers/mtd/nand/omap2.c | 194 +++++++++++++++++++++++++++--------------------
>  1 file changed, 113 insertions(+), 81 deletions(-)
> 
> diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
> index 4ebf16b..bca154a 100644
> --- a/drivers/mtd/nand/omap2.c
> +++ b/drivers/mtd/nand/omap2.c
> @@ -169,8 +169,6 @@ struct omap_nand_info {
>  	u_char				*buf;
>  	int					buf_len;
>  	struct gpmc_nand_regs		reg;
> -	/* generated at runtime depending on ECC algorithm and layout selected */
> -	struct nand_ecclayout		oobinfo;
>  	/* fields specific for BCHx_HW ECC scheme */
>  	struct device			*elm_dev;
>  	struct device_node		*of_node;
> @@ -1639,19 +1637,108 @@ static bool omap2_nand_ecc_check(struct omap_nand_info *info,
>  	return true;
>  }
>  
> +static int omap_ooblayout_ecc(struct mtd_info *mtd, int section,
> +			      struct mtd_oob_region *oobregion)
> +{
> +	struct nand_chip *chip = mtd_to_nand(mtd);
> +	int off = chip->options & NAND_BUSWIDTH_16 ?
> +		  BADBLOCK_MARKER_LENGTH : 1;

IMO "off = 1" is valid only for OMAP_ECC_HAM1_CODE_HW and 8-bit NAND.
For all other layouts it is always set to BADBLOCK_MARKER_LENGTH.

> +
> +	if (section)
> +		return -ERANGE;
> +
> +	oobregion->offset = off;
> +	oobregion->length = chip->ecc.total;
> +
> +	return 0;
> +}
> +
> +static int omap_ooblayout_free(struct mtd_info *mtd, int section,
> +			       struct mtd_oob_region *oobregion)
> +{
> +	struct nand_chip *chip = mtd_to_nand(mtd);
> +	int off = chip->options & NAND_BUSWIDTH_16 ?
> +		  BADBLOCK_MARKER_LENGTH : 1;

ditto.

> +
> +	if (section)
> +		return -ERANGE;
> +
> +	off += chip->ecc.total;
> +	if (off >= mtd->oobsize)
> +		return -ERANGE;
> +
> +	oobregion->offset = off;
> +	oobregion->length = mtd->oobsize - off;
> +
> +	return 0;
> +}
> +
> +static const struct mtd_ooblayout_ops omap_ooblayout_ops = {
> +	.ecc = omap_ooblayout_ecc,
> +	.free = omap_ooblayout_free,
> +};
> +
> +static int omap_sw_ooblayout_ecc(struct mtd_info *mtd, int section,
> +				 struct mtd_oob_region *oobregion)
> +{
> +	struct nand_chip *chip = mtd_to_nand(mtd);
> +	int off = chip->options & NAND_BUSWIDTH_16 ?
> +		  BADBLOCK_MARKER_LENGTH : 1;
> +
> +	if (section >= chip->ecc.steps)
> +		return -ERANGE;
> +
> +	/*
> +	 * When SW correction is employed, one OMAP specific marker byte is
> +	 * reserved after each ECC step.
> +	 */
> +	oobregion->offset = off + (section * (chip->ecc.bytes + 1));
> +	oobregion->length = chip->ecc.bytes;
> +
> +	return 0;
> +}
> +
> +static int omap_sw_ooblayout_free(struct mtd_info *mtd, int section,
> +				  struct mtd_oob_region *oobregion)
> +{
> +	struct nand_chip *chip = mtd_to_nand(mtd);
> +	int off = chip->options & NAND_BUSWIDTH_16 ?
> +		  BADBLOCK_MARKER_LENGTH : 1;
> +
> +	if (section)
> +		return -ERANGE;
> +
> +	/*
> +	 * When SW correction is employed, one OMAP specific marker byte is
> +	 * reserved after each ECC step.
> +	 */
> +	off += ((chip->ecc.bytes + 1) * chip->ecc.steps);
> +	if (off >= mtd->oobsize)
> +		return -ERANGE;
> +
> +	oobregion->offset = off;
> +	oobregion->length = mtd->oobsize - off;
> +
> +	return 0;
> +}
> +
> +static const struct mtd_ooblayout_ops omap_sw_ooblayout_ops = {
> +	.ecc = omap_sw_ooblayout_ecc,
> +	.free = omap_sw_ooblayout_free,
> +};
> +
>  static int omap_nand_probe(struct platform_device *pdev)
>  {
>  	struct omap_nand_info		*info;
>  	struct omap_nand_platform_data	*pdata;
>  	struct mtd_info			*mtd;
>  	struct nand_chip		*nand_chip;
> -	struct nand_ecclayout		*ecclayout;
>  	int				err;
> -	int				i;
>  	dma_cap_mask_t			mask;
>  	unsigned			sig;
> -	unsigned			oob_index;
>  	struct resource			*res;
> +	int				min_oobbytes;
> +	int				oobbytes_per_step;
>  
>  	pdata = dev_get_platdata(&pdev->dev);
>  	if (pdata == NULL) {
> @@ -1810,7 +1897,7 @@ static int omap_nand_probe(struct platform_device *pdev)
>  
>  	/*
>  	 * Bail out earlier to let NAND_ECC_SOFT code create its own
> -	 * ecclayout instead of using ours.
> +	 * ooblayout instead of using ours.
>  	 */
>  	if (info->ecc_opt == OMAP_ECC_HAM1_CODE_SW) {
>  		nand_chip->ecc.mode = NAND_ECC_SOFT;
> @@ -1818,8 +1905,6 @@ static int omap_nand_probe(struct platform_device *pdev)
>  	}
>  
>  	/* populate MTD interface based on ECC scheme */
> -	ecclayout		= &info->oobinfo;
> -	nand_chip->ecc.layout	= ecclayout;
>  	switch (info->ecc_opt) {
>  	case OMAP_ECC_HAM1_CODE_HW:
>  		pr_info("nand: using OMAP_ECC_HAM1_CODE_HW\n");
> @@ -1830,19 +1915,8 @@ static int omap_nand_probe(struct platform_device *pdev)
>  		nand_chip->ecc.calculate        = omap_calculate_ecc;
>  		nand_chip->ecc.hwctl            = omap_enable_hwecc;
>  		nand_chip->ecc.correct          = omap_correct_data;
> -		/* define ECC layout */
> -		ecclayout->eccbytes		= nand_chip->ecc.bytes *
> -							(mtd->writesize /
> -							nand_chip->ecc.size);
> -		if (nand_chip->options & NAND_BUSWIDTH_16)
> -			oob_index		= BADBLOCK_MARKER_LENGTH;
> -		else
> -			oob_index		= 1;
> -		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++)
> -			ecclayout->eccpos[i]	= oob_index;
> -		/* no reserved-marker in ecclayout for this ecc-scheme */
> -		ecclayout->oobfree->offset	=
> -				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
> +		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
> +		oobbytes_per_step		= nand_chip->ecc.bytes;
>  		break;
>  
>  	case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
> @@ -1854,19 +1928,9 @@ static int omap_nand_probe(struct platform_device *pdev)
>  		nand_chip->ecc.hwctl		= omap_enable_hwecc_bch;
>  		nand_chip->ecc.correct		= nand_bch_correct_data;
>  		nand_chip->ecc.calculate	= omap_calculate_ecc_bch;
> -		/* define ECC layout */
> -		ecclayout->eccbytes		= nand_chip->ecc.bytes *
> -							(mtd->writesize /
> -							nand_chip->ecc.size);
> -		oob_index			= BADBLOCK_MARKER_LENGTH;
> -		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++) {
> -			ecclayout->eccpos[i] = oob_index;
> -			if (((i + 1) % nand_chip->ecc.bytes) == 0)
> -				oob_index++;
> -		}
> -		/* include reserved-marker in ecclayout->oobfree calculation */
> -		ecclayout->oobfree->offset	= 1 +
> -				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
> +		mtd_set_ooblayout(mtd, &omap_sw_ooblayout_ops);
> +		/* Reserve one byte for the OMAP marker */
> +		oobbytes_per_step		= nand_chip->ecc.bytes + 1;
>  		/* software bch library is used for locating errors */
>  		nand_chip->ecc.priv		= nand_bch_init(mtd);
>  		if (!nand_chip->ecc.priv) {
> @@ -1888,16 +1952,8 @@ static int omap_nand_probe(struct platform_device *pdev)
>  		nand_chip->ecc.calculate	= omap_calculate_ecc_bch;
>  		nand_chip->ecc.read_page	= omap_read_page_bch;
>  		nand_chip->ecc.write_page	= omap_write_page_bch;
> -		/* define ECC layout */
> -		ecclayout->eccbytes		= nand_chip->ecc.bytes *
> -							(mtd->writesize /
> -							nand_chip->ecc.size);
> -		oob_index			= BADBLOCK_MARKER_LENGTH;
> -		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++)
> -			ecclayout->eccpos[i]	= oob_index;
> -		/* reserved marker already included in ecclayout->eccbytes */
> -		ecclayout->oobfree->offset	=
> -				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
> +		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
> +		oobbytes_per_step		= nand_chip->ecc.bytes;
>  
>  		err = elm_config(info->elm_dev, BCH4_ECC,
>  				 mtd->writesize / nand_chip->ecc.size,
> @@ -1915,19 +1971,9 @@ static int omap_nand_probe(struct platform_device *pdev)
>  		nand_chip->ecc.hwctl		= omap_enable_hwecc_bch;
>  		nand_chip->ecc.correct		= nand_bch_correct_data;
>  		nand_chip->ecc.calculate	= omap_calculate_ecc_bch;
> -		/* define ECC layout */
> -		ecclayout->eccbytes		= nand_chip->ecc.bytes *
> -							(mtd->writesize /
> -							nand_chip->ecc.size);
> -		oob_index			= BADBLOCK_MARKER_LENGTH;
> -		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++) {
> -			ecclayout->eccpos[i] = oob_index;
> -			if (((i + 1) % nand_chip->ecc.bytes) == 0)
> -				oob_index++;
> -		}
> -		/* include reserved-marker in ecclayout->oobfree calculation */
> -		ecclayout->oobfree->offset	= 1 +
> -				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
> +		mtd_set_ooblayout(mtd, &omap_sw_ooblayout_ops);
> +		/* Reserve one byte for the OMAP marker */
> +		oobbytes_per_step		= nand_chip->ecc.bytes + 1;
>  		/* software bch library is used for locating errors */
>  		nand_chip->ecc.priv		= nand_bch_init(mtd);
>  		if (!nand_chip->ecc.priv) {
> @@ -1949,6 +1995,8 @@ static int omap_nand_probe(struct platform_device *pdev)
>  		nand_chip->ecc.calculate	= omap_calculate_ecc_bch;
>  		nand_chip->ecc.read_page	= omap_read_page_bch;
>  		nand_chip->ecc.write_page	= omap_write_page_bch;
> +		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
> +		oobbytes_per_step		= nand_chip->ecc.bytes;
>  
>  		err = elm_config(info->elm_dev, BCH8_ECC,
>  				 mtd->writesize / nand_chip->ecc.size,
> @@ -1956,16 +2004,6 @@ static int omap_nand_probe(struct platform_device *pdev)
>  		if (err < 0)
>  			goto return_error;
>  
> -		/* define ECC layout */
> -		ecclayout->eccbytes		= nand_chip->ecc.bytes *
> -							(mtd->writesize /
> -							nand_chip->ecc.size);
> -		oob_index			= BADBLOCK_MARKER_LENGTH;
> -		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++)
> -			ecclayout->eccpos[i]	= oob_index;
> -		/* reserved marker already included in ecclayout->eccbytes */
> -		ecclayout->oobfree->offset	=
> -				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
>  		break;
>  
>  	case OMAP_ECC_BCH16_CODE_HW:
> @@ -1979,6 +2017,8 @@ static int omap_nand_probe(struct platform_device *pdev)
>  		nand_chip->ecc.calculate	= omap_calculate_ecc_bch;
>  		nand_chip->ecc.read_page	= omap_read_page_bch;
>  		nand_chip->ecc.write_page	= omap_write_page_bch;
> +		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
> +		oobbytes_per_step		= nand_chip->ecc.bytes;
>  
>  		err = elm_config(info->elm_dev, BCH16_ECC,
>  				 mtd->writesize / nand_chip->ecc.size,
> @@ -1986,16 +2026,6 @@ static int omap_nand_probe(struct platform_device *pdev)
>  		if (err < 0)
>  			goto return_error;
>  
> -		/* define ECC layout */
> -		ecclayout->eccbytes		= nand_chip->ecc.bytes *
> -							(mtd->writesize /
> -							nand_chip->ecc.size);
> -		oob_index			= BADBLOCK_MARKER_LENGTH;
> -		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++)
> -			ecclayout->eccpos[i]	= oob_index;
> -		/* reserved marker already included in ecclayout->eccbytes */
> -		ecclayout->oobfree->offset	=
> -				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
>  		break;
>  	default:
>  		dev_err(&info->pdev->dev, "invalid or unsupported ECC scheme\n");
> @@ -2003,13 +2033,15 @@ static int omap_nand_probe(struct platform_device *pdev)
>  		goto return_error;
>  	}
>  
> -	/* all OOB bytes from oobfree->offset till end off OOB are free */
> -	ecclayout->oobfree->length = mtd->oobsize - ecclayout->oobfree->offset;
>  	/* check if NAND device's OOB is enough to store ECC signatures */
> -	if (mtd->oobsize < (ecclayout->eccbytes + BADBLOCK_MARKER_LENGTH)) {
> +	min_oobbytes = (oobbytes_per_step *
> +			(mtd->writesize / nand_chip->ecc.size)) +
> +		       (nand_chip->options & NAND_BUSWIDTH_16 ?
> +			BADBLOCK_MARKER_LENGTH : 1);

would it affect this as well?

> +	if (mtd->oobsize < min_oobbytes) {
>  		dev_err(&info->pdev->dev,
>  			"not enough OOB bytes required = %d, available=%d\n",
> -			ecclayout->eccbytes, mtd->oobsize);
> +			min_oobbytes, mtd->oobsize);
>  		err = -EINVAL;
>  		goto return_error;
>  	}
> 

I will need to test this change with all possible configurations.
The number of configurations on OMAP is a bit overwhelming :(.

cheers,
-roger

Re: [PATCH v5 39/50] mtd: nand: omap2: switch to mtd_ooblayout_ops

[Roger Quadros]

Boris,

On 30/03/16 19:14, Boris Brezillon wrote:
> Implementing the mtd_ooblayout_ops interface is the new way of exposing
> ECC/OOB layout to MTD users.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
> ---
>  drivers/mtd/nand/omap2.c | 194 +++++++++++++++++++++++++++--------------------
>  1 file changed, 113 insertions(+), 81 deletions(-)
> 
> diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
> index 4ebf16b..bca154a 100644
> --- a/drivers/mtd/nand/omap2.c
> +++ b/drivers/mtd/nand/omap2.c
> @@ -169,8 +169,6 @@ struct omap_nand_info {
>  	u_char				*buf;
>  	int					buf_len;
>  	struct gpmc_nand_regs		reg;
> -	/* generated at runtime depending on ECC algorithm and layout selected */
> -	struct nand_ecclayout		oobinfo;
>  	/* fields specific for BCHx_HW ECC scheme */
>  	struct device			*elm_dev;
>  	struct device_node		*of_node;
> @@ -1639,19 +1637,108 @@ static bool omap2_nand_ecc_check(struct omap_nand_info *info,
>  	return true;
>  }
>  
> +static int omap_ooblayout_ecc(struct mtd_info *mtd, int section,
> +			      struct mtd_oob_region *oobregion)
> +{
> +	struct nand_chip *chip = mtd_to_nand(mtd);
> +	int off = chip->options & NAND_BUSWIDTH_16 ?
> +		  BADBLOCK_MARKER_LENGTH : 1;

IMO "off = 1" is valid only for OMAP_ECC_HAM1_CODE_HW and 8-bit NAND.
For all other layouts it is always set to BADBLOCK_MARKER_LENGTH.

> +
> +	if (section)
> +		return -ERANGE;
> +
> +	oobregion->offset = off;
> +	oobregion->length = chip->ecc.total;
> +
> +	return 0;
> +}
> +
> +static int omap_ooblayout_free(struct mtd_info *mtd, int section,
> +			       struct mtd_oob_region *oobregion)
> +{
> +	struct nand_chip *chip = mtd_to_nand(mtd);
> +	int off = chip->options & NAND_BUSWIDTH_16 ?
> +		  BADBLOCK_MARKER_LENGTH : 1;

ditto.

> +
> +	if (section)
> +		return -ERANGE;
> +
> +	off += chip->ecc.total;
> +	if (off >= mtd->oobsize)
> +		return -ERANGE;
> +
> +	oobregion->offset = off;
> +	oobregion->length = mtd->oobsize - off;
> +
> +	return 0;
> +}
> +
> +static const struct mtd_ooblayout_ops omap_ooblayout_ops = {
> +	.ecc = omap_ooblayout_ecc,
> +	.free = omap_ooblayout_free,
> +};
> +
> +static int omap_sw_ooblayout_ecc(struct mtd_info *mtd, int section,
> +				 struct mtd_oob_region *oobregion)
> +{
> +	struct nand_chip *chip = mtd_to_nand(mtd);
> +	int off = chip->options & NAND_BUSWIDTH_16 ?
> +		  BADBLOCK_MARKER_LENGTH : 1;
> +
> +	if (section >= chip->ecc.steps)
> +		return -ERANGE;
> +
> +	/*
> +	 * When SW correction is employed, one OMAP specific marker byte is
> +	 * reserved after each ECC step.
> +	 */
> +	oobregion->offset = off + (section * (chip->ecc.bytes + 1));
> +	oobregion->length = chip->ecc.bytes;
> +
> +	return 0;
> +}
> +
> +static int omap_sw_ooblayout_free(struct mtd_info *mtd, int section,
> +				  struct mtd_oob_region *oobregion)
> +{
> +	struct nand_chip *chip = mtd_to_nand(mtd);
> +	int off = chip->options & NAND_BUSWIDTH_16 ?
> +		  BADBLOCK_MARKER_LENGTH : 1;
> +
> +	if (section)
> +		return -ERANGE;
> +
> +	/*
> +	 * When SW correction is employed, one OMAP specific marker byte is
> +	 * reserved after each ECC step.
> +	 */
> +	off += ((chip->ecc.bytes + 1) * chip->ecc.steps);
> +	if (off >= mtd->oobsize)
> +		return -ERANGE;
> +
> +	oobregion->offset = off;
> +	oobregion->length = mtd->oobsize - off;
> +
> +	return 0;
> +}
> +
> +static const struct mtd_ooblayout_ops omap_sw_ooblayout_ops = {
> +	.ecc = omap_sw_ooblayout_ecc,
> +	.free = omap_sw_ooblayout_free,
> +};
> +
>  static int omap_nand_probe(struct platform_device *pdev)
>  {
>  	struct omap_nand_info		*info;
>  	struct omap_nand_platform_data	*pdata;
>  	struct mtd_info			*mtd;
>  	struct nand_chip		*nand_chip;
> -	struct nand_ecclayout		*ecclayout;
>  	int				err;
> -	int				i;
>  	dma_cap_mask_t			mask;
>  	unsigned			sig;
> -	unsigned			oob_index;
>  	struct resource			*res;
> +	int				min_oobbytes;
> +	int				oobbytes_per_step;
>  
>  	pdata = dev_get_platdata(&pdev->dev);
>  	if (pdata == NULL) {
> @@ -1810,7 +1897,7 @@ static int omap_nand_probe(struct platform_device *pdev)
>  
>  	/*
>  	 * Bail out earlier to let NAND_ECC_SOFT code create its own
> -	 * ecclayout instead of using ours.
> +	 * ooblayout instead of using ours.
>  	 */
>  	if (info->ecc_opt == OMAP_ECC_HAM1_CODE_SW) {
>  		nand_chip->ecc.mode = NAND_ECC_SOFT;
> @@ -1818,8 +1905,6 @@ static int omap_nand_probe(struct platform_device *pdev)
>  	}
>  
>  	/* populate MTD interface based on ECC scheme */
> -	ecclayout		= &info->oobinfo;
> -	nand_chip->ecc.layout	= ecclayout;
>  	switch (info->ecc_opt) {
>  	case OMAP_ECC_HAM1_CODE_HW:
>  		pr_info("nand: using OMAP_ECC_HAM1_CODE_HW\n");
> @@ -1830,19 +1915,8 @@ static int omap_nand_probe(struct platform_device *pdev)
>  		nand_chip->ecc.calculate        = omap_calculate_ecc;
>  		nand_chip->ecc.hwctl            = omap_enable_hwecc;
>  		nand_chip->ecc.correct          = omap_correct_data;
> -		/* define ECC layout */
> -		ecclayout->eccbytes		= nand_chip->ecc.bytes *
> -							(mtd->writesize /
> -							nand_chip->ecc.size);
> -		if (nand_chip->options & NAND_BUSWIDTH_16)
> -			oob_index		= BADBLOCK_MARKER_LENGTH;
> -		else
> -			oob_index		= 1;
> -		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++)
> -			ecclayout->eccpos[i]	= oob_index;
> -		/* no reserved-marker in ecclayout for this ecc-scheme */
> -		ecclayout->oobfree->offset	=
> -				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
> +		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
> +		oobbytes_per_step		= nand_chip->ecc.bytes;
>  		break;
>  
>  	case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
> @@ -1854,19 +1928,9 @@ static int omap_nand_probe(struct platform_device *pdev)
>  		nand_chip->ecc.hwctl		= omap_enable_hwecc_bch;
>  		nand_chip->ecc.correct		= nand_bch_correct_data;
>  		nand_chip->ecc.calculate	= omap_calculate_ecc_bch;
> -		/* define ECC layout */
> -		ecclayout->eccbytes		= nand_chip->ecc.bytes *
> -							(mtd->writesize /
> -							nand_chip->ecc.size);
> -		oob_index			= BADBLOCK_MARKER_LENGTH;
> -		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++) {
> -			ecclayout->eccpos[i] = oob_index;
> -			if (((i + 1) % nand_chip->ecc.bytes) == 0)
> -				oob_index++;
> -		}
> -		/* include reserved-marker in ecclayout->oobfree calculation */
> -		ecclayout->oobfree->offset	= 1 +
> -				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
> +		mtd_set_ooblayout(mtd, &omap_sw_ooblayout_ops);
> +		/* Reserve one byte for the OMAP marker */
> +		oobbytes_per_step		= nand_chip->ecc.bytes + 1;
>  		/* software bch library is used for locating errors */
>  		nand_chip->ecc.priv		= nand_bch_init(mtd);
>  		if (!nand_chip->ecc.priv) {
> @@ -1888,16 +1952,8 @@ static int omap_nand_probe(struct platform_device *pdev)
>  		nand_chip->ecc.calculate	= omap_calculate_ecc_bch;
>  		nand_chip->ecc.read_page	= omap_read_page_bch;
>  		nand_chip->ecc.write_page	= omap_write_page_bch;
> -		/* define ECC layout */
> -		ecclayout->eccbytes		= nand_chip->ecc.bytes *
> -							(mtd->writesize /
> -							nand_chip->ecc.size);
> -		oob_index			= BADBLOCK_MARKER_LENGTH;
> -		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++)
> -			ecclayout->eccpos[i]	= oob_index;
> -		/* reserved marker already included in ecclayout->eccbytes */
> -		ecclayout->oobfree->offset	=
> -				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
> +		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
> +		oobbytes_per_step		= nand_chip->ecc.bytes;
>  
>  		err = elm_config(info->elm_dev, BCH4_ECC,
>  				 mtd->writesize / nand_chip->ecc.size,
> @@ -1915,19 +1971,9 @@ static int omap_nand_probe(struct platform_device *pdev)
>  		nand_chip->ecc.hwctl		= omap_enable_hwecc_bch;
>  		nand_chip->ecc.correct		= nand_bch_correct_data;
>  		nand_chip->ecc.calculate	= omap_calculate_ecc_bch;
> -		/* define ECC layout */
> -		ecclayout->eccbytes		= nand_chip->ecc.bytes *
> -							(mtd->writesize /
> -							nand_chip->ecc.size);
> -		oob_index			= BADBLOCK_MARKER_LENGTH;
> -		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++) {
> -			ecclayout->eccpos[i] = oob_index;
> -			if (((i + 1) % nand_chip->ecc.bytes) == 0)
> -				oob_index++;
> -		}
> -		/* include reserved-marker in ecclayout->oobfree calculation */
> -		ecclayout->oobfree->offset	= 1 +
> -				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
> +		mtd_set_ooblayout(mtd, &omap_sw_ooblayout_ops);
> +		/* Reserve one byte for the OMAP marker */
> +		oobbytes_per_step		= nand_chip->ecc.bytes + 1;
>  		/* software bch library is used for locating errors */
>  		nand_chip->ecc.priv		= nand_bch_init(mtd);
>  		if (!nand_chip->ecc.priv) {
> @@ -1949,6 +1995,8 @@ static int omap_nand_probe(struct platform_device *pdev)
>  		nand_chip->ecc.calculate	= omap_calculate_ecc_bch;
>  		nand_chip->ecc.read_page	= omap_read_page_bch;
>  		nand_chip->ecc.write_page	= omap_write_page_bch;
> +		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
> +		oobbytes_per_step		= nand_chip->ecc.bytes;
>  
>  		err = elm_config(info->elm_dev, BCH8_ECC,
>  				 mtd->writesize / nand_chip->ecc.size,
> @@ -1956,16 +2004,6 @@ static int omap_nand_probe(struct platform_device *pdev)
>  		if (err < 0)
>  			goto return_error;
>  
> -		/* define ECC layout */
> -		ecclayout->eccbytes		= nand_chip->ecc.bytes *
> -							(mtd->writesize /
> -							nand_chip->ecc.size);
> -		oob_index			= BADBLOCK_MARKER_LENGTH;
> -		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++)
> -			ecclayout->eccpos[i]	= oob_index;
> -		/* reserved marker already included in ecclayout->eccbytes */
> -		ecclayout->oobfree->offset	=
> -				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
>  		break;
>  
>  	case OMAP_ECC_BCH16_CODE_HW:
> @@ -1979,6 +2017,8 @@ static int omap_nand_probe(struct platform_device *pdev)
>  		nand_chip->ecc.calculate	= omap_calculate_ecc_bch;
>  		nand_chip->ecc.read_page	= omap_read_page_bch;
>  		nand_chip->ecc.write_page	= omap_write_page_bch;
> +		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
> +		oobbytes_per_step		= nand_chip->ecc.bytes;
>  
>  		err = elm_config(info->elm_dev, BCH16_ECC,
>  				 mtd->writesize / nand_chip->ecc.size,
> @@ -1986,16 +2026,6 @@ static int omap_nand_probe(struct platform_device *pdev)
>  		if (err < 0)
>  			goto return_error;
>  
> -		/* define ECC layout */
> -		ecclayout->eccbytes		= nand_chip->ecc.bytes *
> -							(mtd->writesize /
> -							nand_chip->ecc.size);
> -		oob_index			= BADBLOCK_MARKER_LENGTH;
> -		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++)
> -			ecclayout->eccpos[i]	= oob_index;
> -		/* reserved marker already included in ecclayout->eccbytes */
> -		ecclayout->oobfree->offset	=
> -				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
>  		break;
>  	default:
>  		dev_err(&info->pdev->dev, "invalid or unsupported ECC scheme\n");
> @@ -2003,13 +2033,15 @@ static int omap_nand_probe(struct platform_device *pdev)
>  		goto return_error;
>  	}
>  
> -	/* all OOB bytes from oobfree->offset till end off OOB are free */
> -	ecclayout->oobfree->length = mtd->oobsize - ecclayout->oobfree->offset;
>  	/* check if NAND device's OOB is enough to store ECC signatures */
> -	if (mtd->oobsize < (ecclayout->eccbytes + BADBLOCK_MARKER_LENGTH)) {
> +	min_oobbytes = (oobbytes_per_step *
> +			(mtd->writesize / nand_chip->ecc.size)) +
> +		       (nand_chip->options & NAND_BUSWIDTH_16 ?
> +			BADBLOCK_MARKER_LENGTH : 1);

would it affect this as well?

> +	if (mtd->oobsize < min_oobbytes) {
>  		dev_err(&info->pdev->dev,
>  			"not enough OOB bytes required = %d, available=%d\n",
> -			ecclayout->eccbytes, mtd->oobsize);
> +			min_oobbytes, mtd->oobsize);
>  		err = -EINVAL;
>  		goto return_error;
>  	}
> 

I will need to test this change with all possible configurations.
The number of configurations on OMAP is a bit overwhelming :(.

cheers,
-roger

[PATCH v5 39/50] mtd: nand: omap2: switch to mtd_ooblayout_ops

[Roger Quadros]

Boris,

On 30/03/16 19:14, Boris Brezillon wrote:
> Implementing the mtd_ooblayout_ops interface is the new way of exposing
> ECC/OOB layout to MTD users.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
> ---
>  drivers/mtd/nand/omap2.c | 194 +++++++++++++++++++++++++++--------------------
>  1 file changed, 113 insertions(+), 81 deletions(-)
> 
> diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
> index 4ebf16b..bca154a 100644
> --- a/drivers/mtd/nand/omap2.c
> +++ b/drivers/mtd/nand/omap2.c
> @@ -169,8 +169,6 @@ struct omap_nand_info {
>  	u_char				*buf;
>  	int					buf_len;
>  	struct gpmc_nand_regs		reg;
> -	/* generated at runtime depending on ECC algorithm and layout selected */
> -	struct nand_ecclayout		oobinfo;
>  	/* fields specific for BCHx_HW ECC scheme */
>  	struct device			*elm_dev;
>  	struct device_node		*of_node;
> @@ -1639,19 +1637,108 @@ static bool omap2_nand_ecc_check(struct omap_nand_info *info,
>  	return true;
>  }
>  
> +static int omap_ooblayout_ecc(struct mtd_info *mtd, int section,
> +			      struct mtd_oob_region *oobregion)
> +{
> +	struct nand_chip *chip = mtd_to_nand(mtd);
> +	int off = chip->options & NAND_BUSWIDTH_16 ?
> +		  BADBLOCK_MARKER_LENGTH : 1;

IMO "off = 1" is valid only for OMAP_ECC_HAM1_CODE_HW and 8-bit NAND.
For all other layouts it is always set to BADBLOCK_MARKER_LENGTH.

> +
> +	if (section)
> +		return -ERANGE;
> +
> +	oobregion->offset = off;
> +	oobregion->length = chip->ecc.total;
> +
> +	return 0;
> +}
> +
> +static int omap_ooblayout_free(struct mtd_info *mtd, int section,
> +			       struct mtd_oob_region *oobregion)
> +{
> +	struct nand_chip *chip = mtd_to_nand(mtd);
> +	int off = chip->options & NAND_BUSWIDTH_16 ?
> +		  BADBLOCK_MARKER_LENGTH : 1;

ditto.

> +
> +	if (section)
> +		return -ERANGE;
> +
> +	off += chip->ecc.total;
> +	if (off >= mtd->oobsize)
> +		return -ERANGE;
> +
> +	oobregion->offset = off;
> +	oobregion->length = mtd->oobsize - off;
> +
> +	return 0;
> +}
> +
> +static const struct mtd_ooblayout_ops omap_ooblayout_ops = {
> +	.ecc = omap_ooblayout_ecc,
> +	.free = omap_ooblayout_free,
> +};
> +
> +static int omap_sw_ooblayout_ecc(struct mtd_info *mtd, int section,
> +				 struct mtd_oob_region *oobregion)
> +{
> +	struct nand_chip *chip = mtd_to_nand(mtd);
> +	int off = chip->options & NAND_BUSWIDTH_16 ?
> +		  BADBLOCK_MARKER_LENGTH : 1;
> +
> +	if (section >= chip->ecc.steps)
> +		return -ERANGE;
> +
> +	/*
> +	 * When SW correction is employed, one OMAP specific marker byte is
> +	 * reserved after each ECC step.
> +	 */
> +	oobregion->offset = off + (section * (chip->ecc.bytes + 1));
> +	oobregion->length = chip->ecc.bytes;
> +
> +	return 0;
> +}
> +
> +static int omap_sw_ooblayout_free(struct mtd_info *mtd, int section,
> +				  struct mtd_oob_region *oobregion)
> +{
> +	struct nand_chip *chip = mtd_to_nand(mtd);
> +	int off = chip->options & NAND_BUSWIDTH_16 ?
> +		  BADBLOCK_MARKER_LENGTH : 1;
> +
> +	if (section)
> +		return -ERANGE;
> +
> +	/*
> +	 * When SW correction is employed, one OMAP specific marker byte is
> +	 * reserved after each ECC step.
> +	 */
> +	off += ((chip->ecc.bytes + 1) * chip->ecc.steps);
> +	if (off >= mtd->oobsize)
> +		return -ERANGE;
> +
> +	oobregion->offset = off;
> +	oobregion->length = mtd->oobsize - off;
> +
> +	return 0;
> +}
> +
> +static const struct mtd_ooblayout_ops omap_sw_ooblayout_ops = {
> +	.ecc = omap_sw_ooblayout_ecc,
> +	.free = omap_sw_ooblayout_free,
> +};
> +
>  static int omap_nand_probe(struct platform_device *pdev)
>  {
>  	struct omap_nand_info		*info;
>  	struct omap_nand_platform_data	*pdata;
>  	struct mtd_info			*mtd;
>  	struct nand_chip		*nand_chip;
> -	struct nand_ecclayout		*ecclayout;
>  	int				err;
> -	int				i;
>  	dma_cap_mask_t			mask;
>  	unsigned			sig;
> -	unsigned			oob_index;
>  	struct resource			*res;
> +	int				min_oobbytes;
> +	int				oobbytes_per_step;
>  
>  	pdata = dev_get_platdata(&pdev->dev);
>  	if (pdata == NULL) {
> @@ -1810,7 +1897,7 @@ static int omap_nand_probe(struct platform_device *pdev)
>  
>  	/*
>  	 * Bail out earlier to let NAND_ECC_SOFT code create its own
> -	 * ecclayout instead of using ours.
> +	 * ooblayout instead of using ours.
>  	 */
>  	if (info->ecc_opt == OMAP_ECC_HAM1_CODE_SW) {
>  		nand_chip->ecc.mode = NAND_ECC_SOFT;
> @@ -1818,8 +1905,6 @@ static int omap_nand_probe(struct platform_device *pdev)
>  	}
>  
>  	/* populate MTD interface based on ECC scheme */
> -	ecclayout		= &info->oobinfo;
> -	nand_chip->ecc.layout	= ecclayout;
>  	switch (info->ecc_opt) {
>  	case OMAP_ECC_HAM1_CODE_HW:
>  		pr_info("nand: using OMAP_ECC_HAM1_CODE_HW\n");
> @@ -1830,19 +1915,8 @@ static int omap_nand_probe(struct platform_device *pdev)
>  		nand_chip->ecc.calculate        = omap_calculate_ecc;
>  		nand_chip->ecc.hwctl            = omap_enable_hwecc;
>  		nand_chip->ecc.correct          = omap_correct_data;
> -		/* define ECC layout */
> -		ecclayout->eccbytes		= nand_chip->ecc.bytes *
> -							(mtd->writesize /
> -							nand_chip->ecc.size);
> -		if (nand_chip->options & NAND_BUSWIDTH_16)
> -			oob_index		= BADBLOCK_MARKER_LENGTH;
> -		else
> -			oob_index		= 1;
> -		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++)
> -			ecclayout->eccpos[i]	= oob_index;
> -		/* no reserved-marker in ecclayout for this ecc-scheme */
> -		ecclayout->oobfree->offset	=
> -				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
> +		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
> +		oobbytes_per_step		= nand_chip->ecc.bytes;
>  		break;
>  
>  	case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
> @@ -1854,19 +1928,9 @@ static int omap_nand_probe(struct platform_device *pdev)
>  		nand_chip->ecc.hwctl		= omap_enable_hwecc_bch;
>  		nand_chip->ecc.correct		= nand_bch_correct_data;
>  		nand_chip->ecc.calculate	= omap_calculate_ecc_bch;
> -		/* define ECC layout */
> -		ecclayout->eccbytes		= nand_chip->ecc.bytes *
> -							(mtd->writesize /
> -							nand_chip->ecc.size);
> -		oob_index			= BADBLOCK_MARKER_LENGTH;
> -		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++) {
> -			ecclayout->eccpos[i] = oob_index;
> -			if (((i + 1) % nand_chip->ecc.bytes) == 0)
> -				oob_index++;
> -		}
> -		/* include reserved-marker in ecclayout->oobfree calculation */
> -		ecclayout->oobfree->offset	= 1 +
> -				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
> +		mtd_set_ooblayout(mtd, &omap_sw_ooblayout_ops);
> +		/* Reserve one byte for the OMAP marker */
> +		oobbytes_per_step		= nand_chip->ecc.bytes + 1;
>  		/* software bch library is used for locating errors */
>  		nand_chip->ecc.priv		= nand_bch_init(mtd);
>  		if (!nand_chip->ecc.priv) {
> @@ -1888,16 +1952,8 @@ static int omap_nand_probe(struct platform_device *pdev)
>  		nand_chip->ecc.calculate	= omap_calculate_ecc_bch;
>  		nand_chip->ecc.read_page	= omap_read_page_bch;
>  		nand_chip->ecc.write_page	= omap_write_page_bch;
> -		/* define ECC layout */
> -		ecclayout->eccbytes		= nand_chip->ecc.bytes *
> -							(mtd->writesize /
> -							nand_chip->ecc.size);
> -		oob_index			= BADBLOCK_MARKER_LENGTH;
> -		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++)
> -			ecclayout->eccpos[i]	= oob_index;
> -		/* reserved marker already included in ecclayout->eccbytes */
> -		ecclayout->oobfree->offset	=
> -				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
> +		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
> +		oobbytes_per_step		= nand_chip->ecc.bytes;
>  
>  		err = elm_config(info->elm_dev, BCH4_ECC,
>  				 mtd->writesize / nand_chip->ecc.size,
> @@ -1915,19 +1971,9 @@ static int omap_nand_probe(struct platform_device *pdev)
>  		nand_chip->ecc.hwctl		= omap_enable_hwecc_bch;
>  		nand_chip->ecc.correct		= nand_bch_correct_data;
>  		nand_chip->ecc.calculate	= omap_calculate_ecc_bch;
> -		/* define ECC layout */
> -		ecclayout->eccbytes		= nand_chip->ecc.bytes *
> -							(mtd->writesize /
> -							nand_chip->ecc.size);
> -		oob_index			= BADBLOCK_MARKER_LENGTH;
> -		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++) {
> -			ecclayout->eccpos[i] = oob_index;
> -			if (((i + 1) % nand_chip->ecc.bytes) == 0)
> -				oob_index++;
> -		}
> -		/* include reserved-marker in ecclayout->oobfree calculation */
> -		ecclayout->oobfree->offset	= 1 +
> -				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
> +		mtd_set_ooblayout(mtd, &omap_sw_ooblayout_ops);
> +		/* Reserve one byte for the OMAP marker */
> +		oobbytes_per_step		= nand_chip->ecc.bytes + 1;
>  		/* software bch library is used for locating errors */
>  		nand_chip->ecc.priv		= nand_bch_init(mtd);
>  		if (!nand_chip->ecc.priv) {
> @@ -1949,6 +1995,8 @@ static int omap_nand_probe(struct platform_device *pdev)
>  		nand_chip->ecc.calculate	= omap_calculate_ecc_bch;
>  		nand_chip->ecc.read_page	= omap_read_page_bch;
>  		nand_chip->ecc.write_page	= omap_write_page_bch;
> +		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
> +		oobbytes_per_step		= nand_chip->ecc.bytes;
>  
>  		err = elm_config(info->elm_dev, BCH8_ECC,
>  				 mtd->writesize / nand_chip->ecc.size,
> @@ -1956,16 +2004,6 @@ static int omap_nand_probe(struct platform_device *pdev)
>  		if (err < 0)
>  			goto return_error;
>  
> -		/* define ECC layout */
> -		ecclayout->eccbytes		= nand_chip->ecc.bytes *
> -							(mtd->writesize /
> -							nand_chip->ecc.size);
> -		oob_index			= BADBLOCK_MARKER_LENGTH;
> -		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++)
> -			ecclayout->eccpos[i]	= oob_index;
> -		/* reserved marker already included in ecclayout->eccbytes */
> -		ecclayout->oobfree->offset	=
> -				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
>  		break;
>  
>  	case OMAP_ECC_BCH16_CODE_HW:
> @@ -1979,6 +2017,8 @@ static int omap_nand_probe(struct platform_device *pdev)
>  		nand_chip->ecc.calculate	= omap_calculate_ecc_bch;
>  		nand_chip->ecc.read_page	= omap_read_page_bch;
>  		nand_chip->ecc.write_page	= omap_write_page_bch;
> +		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
> +		oobbytes_per_step		= nand_chip->ecc.bytes;
>  
>  		err = elm_config(info->elm_dev, BCH16_ECC,
>  				 mtd->writesize / nand_chip->ecc.size,
> @@ -1986,16 +2026,6 @@ static int omap_nand_probe(struct platform_device *pdev)
>  		if (err < 0)
>  			goto return_error;
>  
> -		/* define ECC layout */
> -		ecclayout->eccbytes		= nand_chip->ecc.bytes *
> -							(mtd->writesize /
> -							nand_chip->ecc.size);
> -		oob_index			= BADBLOCK_MARKER_LENGTH;
> -		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++)
> -			ecclayout->eccpos[i]	= oob_index;
> -		/* reserved marker already included in ecclayout->eccbytes */
> -		ecclayout->oobfree->offset	=
> -				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
>  		break;
>  	default:
>  		dev_err(&info->pdev->dev, "invalid or unsupported ECC scheme\n");
> @@ -2003,13 +2033,15 @@ static int omap_nand_probe(struct platform_device *pdev)
>  		goto return_error;
>  	}
>  
> -	/* all OOB bytes from oobfree->offset till end off OOB are free */
> -	ecclayout->oobfree->length = mtd->oobsize - ecclayout->oobfree->offset;
>  	/* check if NAND device's OOB is enough to store ECC signatures */
> -	if (mtd->oobsize < (ecclayout->eccbytes + BADBLOCK_MARKER_LENGTH)) {
> +	min_oobbytes = (oobbytes_per_step *
> +			(mtd->writesize / nand_chip->ecc.size)) +
> +		       (nand_chip->options & NAND_BUSWIDTH_16 ?
> +			BADBLOCK_MARKER_LENGTH : 1);

would it affect this as well?

> +	if (mtd->oobsize < min_oobbytes) {
>  		dev_err(&info->pdev->dev,
>  			"not enough OOB bytes required = %d, available=%d\n",
> -			ecclayout->eccbytes, mtd->oobsize);
> +			min_oobbytes, mtd->oobsize);
>  		err = -EINVAL;
>  		goto return_error;
>  	}
> 

I will need to test this change with all possible configurations.
The number of configurations on OMAP is a bit overwhelming :(.

cheers,
-roger

Re: [PATCH v5 39/50] mtd: nand: omap2: switch to mtd_ooblayout_ops

[Boris Brezillon]

On Mon, 18 Apr 2016 17:32:49 +0300
Roger Quadros <rogerq@ti.com> wrote:

> Boris,
> 
> On 30/03/16 19:14, Boris Brezillon wrote:
> > Implementing the mtd_ooblayout_ops interface is the new way of exposing
> > ECC/OOB layout to MTD users.
> > 
> > Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
> > ---
> >  drivers/mtd/nand/omap2.c | 194 +++++++++++++++++++++++++++--------------------
> >  1 file changed, 113 insertions(+), 81 deletions(-)
> > 
> > diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
> > index 4ebf16b..bca154a 100644
> > --- a/drivers/mtd/nand/omap2.c
> > +++ b/drivers/mtd/nand/omap2.c
> > @@ -169,8 +169,6 @@ struct omap_nand_info {
> >  	u_char				*buf;
> >  	int					buf_len;
> >  	struct gpmc_nand_regs		reg;
> > -	/* generated at runtime depending on ECC algorithm and layout selected */
> > -	struct nand_ecclayout		oobinfo;
> >  	/* fields specific for BCHx_HW ECC scheme */
> >  	struct device			*elm_dev;
> >  	struct device_node		*of_node;
> > @@ -1639,19 +1637,108 @@ static bool omap2_nand_ecc_check(struct omap_nand_info *info,
> >  	return true;
> >  }
> >  
> > +static int omap_ooblayout_ecc(struct mtd_info *mtd, int section,
> > +			      struct mtd_oob_region *oobregion)
> > +{
> > +	struct nand_chip *chip = mtd_to_nand(mtd);
> > +	int off = chip->options & NAND_BUSWIDTH_16 ?
> > +		  BADBLOCK_MARKER_LENGTH : 1;
> 
> IMO "off = 1" is valid only for OMAP_ECC_HAM1_CODE_HW and 8-bit NAND.
> For all other layouts it is always set to BADBLOCK_MARKER_LENGTH.

Indeed.

[...]

> > -	/* all OOB bytes from oobfree->offset till end off OOB are free */
> > -	ecclayout->oobfree->length = mtd->oobsize - ecclayout->oobfree->offset;
> >  	/* check if NAND device's OOB is enough to store ECC signatures */
> > -	if (mtd->oobsize < (ecclayout->eccbytes + BADBLOCK_MARKER_LENGTH)) {
> > +	min_oobbytes = (oobbytes_per_step *
> > +			(mtd->writesize / nand_chip->ecc.size)) +
> > +		       (nand_chip->options & NAND_BUSWIDTH_16 ?
> > +			BADBLOCK_MARKER_LENGTH : 1);
> 
> would it affect this as well?

And here as well.

I've generated a patch (see below) fixing those problems.

> 
> > +	if (mtd->oobsize < min_oobbytes) {
> >  		dev_err(&info->pdev->dev,
> >  			"not enough OOB bytes required = %d, available=%d\n",
> > -			ecclayout->eccbytes, mtd->oobsize);
> > +			min_oobbytes, mtd->oobsize);
> >  		err = -EINVAL;
> >  		goto return_error;
> >  	}
> > 
> 
> I will need to test this change with all possible configurations.
> The number of configurations on OMAP is a bit overwhelming :(.

Sorry about that, but at least now I have someone who can test it :).

Thanks,

Boris

--->8---

diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index 9b96f56..07d4039 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -1640,9 +1640,13 @@ static bool omap2_nand_ecc_check(struct omap_nand_info *info,
 static int omap_ooblayout_ecc(struct mtd_info *mtd, int section,
 			      struct mtd_oob_region *oobregion)
 {
-	struct nand_chip *chip = mtd_to_nand(mtd);
-	int off = chip->options & NAND_BUSWIDTH_16 ?
-		  BADBLOCK_MARKER_LENGTH : 1;
+	struct omap_nand_info *info = mtd_to_omap(mtd);
+	struct nand_chip *chip = &info->nand;
+	int off = BADBLOCK_MARKER_LENGTH;
+
+	if (info->ecc_opt == OMAP_ECC_HAM1_CODE_HW &&
+	    !(chip->options & NAND_BUSWIDTH_16))
+		off = 1;
 
 	if (section)
 		return -ERANGE;
@@ -1656,9 +1660,13 @@ static int omap_ooblayout_ecc(struct mtd_info *mtd, int section,
 static int omap_ooblayout_free(struct mtd_info *mtd, int section,
 			       struct mtd_oob_region *oobregion)
 {
-	struct nand_chip *chip = mtd_to_nand(mtd);
-	int off = chip->options & NAND_BUSWIDTH_16 ?
-		  BADBLOCK_MARKER_LENGTH : 1;
+	struct omap_nand_info *info = mtd_to_omap(mtd);
+	struct nand_chip *chip = &info->nand;
+	int off = BADBLOCK_MARKER_LENGTH;
+
+	if (info->ecc_opt == OMAP_ECC_HAM1_CODE_HW &&
+	    !(chip->options & NAND_BUSWIDTH_16))
+		off = 1;
 
 	if (section)
 		return -ERANGE;
@@ -1682,8 +1690,7 @@ static int omap_sw_ooblayout_ecc(struct mtd_info *mtd, int section,
 				 struct mtd_oob_region *oobregion)
 {
 	struct nand_chip *chip = mtd_to_nand(mtd);
-	int off = chip->options & NAND_BUSWIDTH_16 ?
-		  BADBLOCK_MARKER_LENGTH : 1;
+	int off = BADBLOCK_MARKER_LENGTH;
 
 	if (section >= chip->ecc.steps)
 		return -ERANGE;
@@ -1702,8 +1709,7 @@ static int omap_sw_ooblayout_free(struct mtd_info *mtd, int section,
 				  struct mtd_oob_region *oobregion)
 {
 	struct nand_chip *chip = mtd_to_nand(mtd);
-	int off = chip->options & NAND_BUSWIDTH_16 ?
-		  BADBLOCK_MARKER_LENGTH : 1;
+	int off = BADBLOCK_MARKER_LENGTH;
 
 	if (section)
 		return -ERANGE;
@@ -1737,7 +1743,7 @@ static int omap_nand_probe(struct platform_device *pdev)
 	dma_cap_mask_t			mask;
 	unsigned			sig;
 	struct resource			*res;
-	int				min_oobbytes;
+	int				min_oobbytes = BADBLOCK_MARKER_LENGTH;
 	int				oobbytes_per_step;
 
 	pdata = dev_get_platdata(&pdev->dev);
@@ -1921,6 +1927,9 @@ static int omap_nand_probe(struct platform_device *pdev)
 		nand_chip->ecc.correct          = omap_correct_data;
 		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
 		oobbytes_per_step		= nand_chip->ecc.bytes;
+
+		if (nand_chip->options & NAND_BUSWIDTH_16)
+			min_oobbytes		= 1;
 		break;
 
 	case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
@@ -2038,10 +2047,8 @@ static int omap_nand_probe(struct platform_device *pdev)
 	}
 
 	/* check if NAND device's OOB is enough to store ECC signatures */
-	min_oobbytes = (oobbytes_per_step *
-			(mtd->writesize / nand_chip->ecc.size)) +
-		       (nand_chip->options & NAND_BUSWIDTH_16 ?
-			BADBLOCK_MARKER_LENGTH : 1);
+	min_oobbytes += (oobbytes_per_step *
+			 (mtd->writesize / nand_chip->ecc.size));
 	if (mtd->oobsize < min_oobbytes) {
 		dev_err(&info->pdev->dev,
 			"not enough OOB bytes required = %d, available=%d\n",

Re: [PATCH v5 39/50] mtd: nand: omap2: switch to mtd_ooblayout_ops

[Boris Brezillon]

On Mon, 18 Apr 2016 17:32:49 +0300
Roger Quadros <rogerq-l0cyMroinI0@public.gmane.org> wrote:

> Boris,
> 
> On 30/03/16 19:14, Boris Brezillon wrote:
> > Implementing the mtd_ooblayout_ops interface is the new way of exposing
> > ECC/OOB layout to MTD users.
> > 
> > Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
> > ---
> >  drivers/mtd/nand/omap2.c | 194 +++++++++++++++++++++++++++--------------------
> >  1 file changed, 113 insertions(+), 81 deletions(-)
> > 
> > diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
> > index 4ebf16b..bca154a 100644
> > --- a/drivers/mtd/nand/omap2.c
> > +++ b/drivers/mtd/nand/omap2.c
> > @@ -169,8 +169,6 @@ struct omap_nand_info {
> >  	u_char				*buf;
> >  	int					buf_len;
> >  	struct gpmc_nand_regs		reg;
> > -	/* generated at runtime depending on ECC algorithm and layout selected */
> > -	struct nand_ecclayout		oobinfo;
> >  	/* fields specific for BCHx_HW ECC scheme */
> >  	struct device			*elm_dev;
> >  	struct device_node		*of_node;
> > @@ -1639,19 +1637,108 @@ static bool omap2_nand_ecc_check(struct omap_nand_info *info,
> >  	return true;
> >  }
> >  
> > +static int omap_ooblayout_ecc(struct mtd_info *mtd, int section,
> > +			      struct mtd_oob_region *oobregion)
> > +{
> > +	struct nand_chip *chip = mtd_to_nand(mtd);
> > +	int off = chip->options & NAND_BUSWIDTH_16 ?
> > +		  BADBLOCK_MARKER_LENGTH : 1;
> 
> IMO "off = 1" is valid only for OMAP_ECC_HAM1_CODE_HW and 8-bit NAND.
> For all other layouts it is always set to BADBLOCK_MARKER_LENGTH.

Indeed.

[...]

> > -	/* all OOB bytes from oobfree->offset till end off OOB are free */
> > -	ecclayout->oobfree->length = mtd->oobsize - ecclayout->oobfree->offset;
> >  	/* check if NAND device's OOB is enough to store ECC signatures */
> > -	if (mtd->oobsize < (ecclayout->eccbytes + BADBLOCK_MARKER_LENGTH)) {
> > +	min_oobbytes = (oobbytes_per_step *
> > +			(mtd->writesize / nand_chip->ecc.size)) +
> > +		       (nand_chip->options & NAND_BUSWIDTH_16 ?
> > +			BADBLOCK_MARKER_LENGTH : 1);
> 
> would it affect this as well?

And here as well.

I've generated a patch (see below) fixing those problems.

> 
> > +	if (mtd->oobsize < min_oobbytes) {
> >  		dev_err(&info->pdev->dev,
> >  			"not enough OOB bytes required = %d, available=%d\n",
> > -			ecclayout->eccbytes, mtd->oobsize);
> > +			min_oobbytes, mtd->oobsize);
> >  		err = -EINVAL;
> >  		goto return_error;
> >  	}
> > 
> 
> I will need to test this change with all possible configurations.
> The number of configurations on OMAP is a bit overwhelming :(.

Sorry about that, but at least now I have someone who can test it :).

Thanks,

Boris

--->8---

diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index 9b96f56..07d4039 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -1640,9 +1640,13 @@ static bool omap2_nand_ecc_check(struct omap_nand_info *info,
 static int omap_ooblayout_ecc(struct mtd_info *mtd, int section,
 			      struct mtd_oob_region *oobregion)
 {
-	struct nand_chip *chip = mtd_to_nand(mtd);
-	int off = chip->options & NAND_BUSWIDTH_16 ?
-		  BADBLOCK_MARKER_LENGTH : 1;
+	struct omap_nand_info *info = mtd_to_omap(mtd);
+	struct nand_chip *chip = &info->nand;
+	int off = BADBLOCK_MARKER_LENGTH;
+
+	if (info->ecc_opt == OMAP_ECC_HAM1_CODE_HW &&
+	    !(chip->options & NAND_BUSWIDTH_16))
+		off = 1;
 
 	if (section)
 		return -ERANGE;
@@ -1656,9 +1660,13 @@ static int omap_ooblayout_ecc(struct mtd_info *mtd, int section,
 static int omap_ooblayout_free(struct mtd_info *mtd, int section,
 			       struct mtd_oob_region *oobregion)
 {
-	struct nand_chip *chip = mtd_to_nand(mtd);
-	int off = chip->options & NAND_BUSWIDTH_16 ?
-		  BADBLOCK_MARKER_LENGTH : 1;
+	struct omap_nand_info *info = mtd_to_omap(mtd);
+	struct nand_chip *chip = &info->nand;
+	int off = BADBLOCK_MARKER_LENGTH;
+
+	if (info->ecc_opt == OMAP_ECC_HAM1_CODE_HW &&
+	    !(chip->options & NAND_BUSWIDTH_16))
+		off = 1;
 
 	if (section)
 		return -ERANGE;
@@ -1682,8 +1690,7 @@ static int omap_sw_ooblayout_ecc(struct mtd_info *mtd, int section,
 				 struct mtd_oob_region *oobregion)
 {
 	struct nand_chip *chip = mtd_to_nand(mtd);
-	int off = chip->options & NAND_BUSWIDTH_16 ?
-		  BADBLOCK_MARKER_LENGTH : 1;
+	int off = BADBLOCK_MARKER_LENGTH;
 
 	if (section >= chip->ecc.steps)
 		return -ERANGE;
@@ -1702,8 +1709,7 @@ static int omap_sw_ooblayout_free(struct mtd_info *mtd, int section,
 				  struct mtd_oob_region *oobregion)
 {
 	struct nand_chip *chip = mtd_to_nand(mtd);
-	int off = chip->options & NAND_BUSWIDTH_16 ?
-		  BADBLOCK_MARKER_LENGTH : 1;
+	int off = BADBLOCK_MARKER_LENGTH;
 
 	if (section)
 		return -ERANGE;
@@ -1737,7 +1743,7 @@ static int omap_nand_probe(struct platform_device *pdev)
 	dma_cap_mask_t			mask;
 	unsigned			sig;
 	struct resource			*res;
-	int				min_oobbytes;
+	int				min_oobbytes = BADBLOCK_MARKER_LENGTH;
 	int				oobbytes_per_step;
 
 	pdata = dev_get_platdata(&pdev->dev);
@@ -1921,6 +1927,9 @@ static int omap_nand_probe(struct platform_device *pdev)
 		nand_chip->ecc.correct          = omap_correct_data;
 		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
 		oobbytes_per_step		= nand_chip->ecc.bytes;
+
+		if (nand_chip->options & NAND_BUSWIDTH_16)
+			min_oobbytes		= 1;
 		break;
 
 	case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
@@ -2038,10 +2047,8 @@ static int omap_nand_probe(struct platform_device *pdev)
 	}
 
 	/* check if NAND device's OOB is enough to store ECC signatures */
-	min_oobbytes = (oobbytes_per_step *
-			(mtd->writesize / nand_chip->ecc.size)) +
-		       (nand_chip->options & NAND_BUSWIDTH_16 ?
-			BADBLOCK_MARKER_LENGTH : 1);
+	min_oobbytes += (oobbytes_per_step *
+			 (mtd->writesize / nand_chip->ecc.size));
 	if (mtd->oobsize < min_oobbytes) {
 		dev_err(&info->pdev->dev,
 			"not enough OOB bytes required = %d, available=%d\n",

Re: [PATCH v5 39/50] mtd: nand: omap2: switch to mtd_ooblayout_ops

[Boris Brezillon]

On Mon, 18 Apr 2016 17:32:49 +0300
Roger Quadros <rogerq@ti.com> wrote:

> Boris,
> 
> On 30/03/16 19:14, Boris Brezillon wrote:
> > Implementing the mtd_ooblayout_ops interface is the new way of exposing
> > ECC/OOB layout to MTD users.
> > 
> > Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
> > ---
> >  drivers/mtd/nand/omap2.c | 194 +++++++++++++++++++++++++++--------------------
> >  1 file changed, 113 insertions(+), 81 deletions(-)
> > 
> > diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
> > index 4ebf16b..bca154a 100644
> > --- a/drivers/mtd/nand/omap2.c
> > +++ b/drivers/mtd/nand/omap2.c
> > @@ -169,8 +169,6 @@ struct omap_nand_info {
> >  	u_char				*buf;
> >  	int					buf_len;
> >  	struct gpmc_nand_regs		reg;
> > -	/* generated at runtime depending on ECC algorithm and layout selected */
> > -	struct nand_ecclayout		oobinfo;
> >  	/* fields specific for BCHx_HW ECC scheme */
> >  	struct device			*elm_dev;
> >  	struct device_node		*of_node;
> > @@ -1639,19 +1637,108 @@ static bool omap2_nand_ecc_check(struct omap_nand_info *info,
> >  	return true;
> >  }
> >  
> > +static int omap_ooblayout_ecc(struct mtd_info *mtd, int section,
> > +			      struct mtd_oob_region *oobregion)
> > +{
> > +	struct nand_chip *chip = mtd_to_nand(mtd);
> > +	int off = chip->options & NAND_BUSWIDTH_16 ?
> > +		  BADBLOCK_MARKER_LENGTH : 1;
> 
> IMO "off = 1" is valid only for OMAP_ECC_HAM1_CODE_HW and 8-bit NAND.
> For all other layouts it is always set to BADBLOCK_MARKER_LENGTH.

Indeed.

[...]

> > -	/* all OOB bytes from oobfree->offset till end off OOB are free */
> > -	ecclayout->oobfree->length = mtd->oobsize - ecclayout->oobfree->offset;
> >  	/* check if NAND device's OOB is enough to store ECC signatures */
> > -	if (mtd->oobsize < (ecclayout->eccbytes + BADBLOCK_MARKER_LENGTH)) {
> > +	min_oobbytes = (oobbytes_per_step *
> > +			(mtd->writesize / nand_chip->ecc.size)) +
> > +		       (nand_chip->options & NAND_BUSWIDTH_16 ?
> > +			BADBLOCK_MARKER_LENGTH : 1);
> 
> would it affect this as well?

And here as well.

I've generated a patch (see below) fixing those problems.

> 
> > +	if (mtd->oobsize < min_oobbytes) {
> >  		dev_err(&info->pdev->dev,
> >  			"not enough OOB bytes required = %d, available=%d\n",
> > -			ecclayout->eccbytes, mtd->oobsize);
> > +			min_oobbytes, mtd->oobsize);
> >  		err = -EINVAL;
> >  		goto return_error;
> >  	}
> > 
> 
> I will need to test this change with all possible configurations.
> The number of configurations on OMAP is a bit overwhelming :(.

Sorry about that, but at least now I have someone who can test it :).

Thanks,

Boris

--->8---

diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index 9b96f56..07d4039 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -1640,9 +1640,13 @@ static bool omap2_nand_ecc_check(struct omap_nand_info *info,
 static int omap_ooblayout_ecc(struct mtd_info *mtd, int section,
 			      struct mtd_oob_region *oobregion)
 {
-	struct nand_chip *chip = mtd_to_nand(mtd);
-	int off = chip->options & NAND_BUSWIDTH_16 ?
-		  BADBLOCK_MARKER_LENGTH : 1;
+	struct omap_nand_info *info = mtd_to_omap(mtd);
+	struct nand_chip *chip = &info->nand;
+	int off = BADBLOCK_MARKER_LENGTH;
+
+	if (info->ecc_opt == OMAP_ECC_HAM1_CODE_HW &&
+	    !(chip->options & NAND_BUSWIDTH_16))
+		off = 1;
 
 	if (section)
 		return -ERANGE;
@@ -1656,9 +1660,13 @@ static int omap_ooblayout_ecc(struct mtd_info *mtd, int section,
 static int omap_ooblayout_free(struct mtd_info *mtd, int section,
 			       struct mtd_oob_region *oobregion)
 {
-	struct nand_chip *chip = mtd_to_nand(mtd);
-	int off = chip->options & NAND_BUSWIDTH_16 ?
-		  BADBLOCK_MARKER_LENGTH : 1;
+	struct omap_nand_info *info = mtd_to_omap(mtd);
+	struct nand_chip *chip = &info->nand;
+	int off = BADBLOCK_MARKER_LENGTH;
+
+	if (info->ecc_opt == OMAP_ECC_HAM1_CODE_HW &&
+	    !(chip->options & NAND_BUSWIDTH_16))
+		off = 1;
 
 	if (section)
 		return -ERANGE;
@@ -1682,8 +1690,7 @@ static int omap_sw_ooblayout_ecc(struct mtd_info *mtd, int section,
 				 struct mtd_oob_region *oobregion)
 {
 	struct nand_chip *chip = mtd_to_nand(mtd);
-	int off = chip->options & NAND_BUSWIDTH_16 ?
-		  BADBLOCK_MARKER_LENGTH : 1;
+	int off = BADBLOCK_MARKER_LENGTH;
 
 	if (section >= chip->ecc.steps)
 		return -ERANGE;
@@ -1702,8 +1709,7 @@ static int omap_sw_ooblayout_free(struct mtd_info *mtd, int section,
 				  struct mtd_oob_region *oobregion)
 {
 	struct nand_chip *chip = mtd_to_nand(mtd);
-	int off = chip->options & NAND_BUSWIDTH_16 ?
-		  BADBLOCK_MARKER_LENGTH : 1;
+	int off = BADBLOCK_MARKER_LENGTH;
 
 	if (section)
 		return -ERANGE;
@@ -1737,7 +1743,7 @@ static int omap_nand_probe(struct platform_device *pdev)
 	dma_cap_mask_t			mask;
 	unsigned			sig;
 	struct resource			*res;
-	int				min_oobbytes;
+	int				min_oobbytes = BADBLOCK_MARKER_LENGTH;
 	int				oobbytes_per_step;
 
 	pdata = dev_get_platdata(&pdev->dev);
@@ -1921,6 +1927,9 @@ static int omap_nand_probe(struct platform_device *pdev)
 		nand_chip->ecc.correct          = omap_correct_data;
 		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
 		oobbytes_per_step		= nand_chip->ecc.bytes;
+
+		if (nand_chip->options & NAND_BUSWIDTH_16)
+			min_oobbytes		= 1;
 		break;
 
 	case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
@@ -2038,10 +2047,8 @@ static int omap_nand_probe(struct platform_device *pdev)
 	}
 
 	/* check if NAND device's OOB is enough to store ECC signatures */
-	min_oobbytes = (oobbytes_per_step *
-			(mtd->writesize / nand_chip->ecc.size)) +
-		       (nand_chip->options & NAND_BUSWIDTH_16 ?
-			BADBLOCK_MARKER_LENGTH : 1);
+	min_oobbytes += (oobbytes_per_step *
+			 (mtd->writesize / nand_chip->ecc.size));
 	if (mtd->oobsize < min_oobbytes) {
 		dev_err(&info->pdev->dev,
 			"not enough OOB bytes required = %d, available=%d\n",

[PATCH v5 39/50] mtd: nand: omap2: switch to mtd_ooblayout_ops

[Boris Brezillon]

On Mon, 18 Apr 2016 17:32:49 +0300
Roger Quadros <rogerq@ti.com> wrote:

> Boris,
> 
> On 30/03/16 19:14, Boris Brezillon wrote:
> > Implementing the mtd_ooblayout_ops interface is the new way of exposing
> > ECC/OOB layout to MTD users.
> > 
> > Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
> > ---
> >  drivers/mtd/nand/omap2.c | 194 +++++++++++++++++++++++++++--------------------
> >  1 file changed, 113 insertions(+), 81 deletions(-)
> > 
> > diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
> > index 4ebf16b..bca154a 100644
> > --- a/drivers/mtd/nand/omap2.c
> > +++ b/drivers/mtd/nand/omap2.c
> > @@ -169,8 +169,6 @@ struct omap_nand_info {
> >  	u_char				*buf;
> >  	int					buf_len;
> >  	struct gpmc_nand_regs		reg;
> > -	/* generated at runtime depending on ECC algorithm and layout selected */
> > -	struct nand_ecclayout		oobinfo;
> >  	/* fields specific for BCHx_HW ECC scheme */
> >  	struct device			*elm_dev;
> >  	struct device_node		*of_node;
> > @@ -1639,19 +1637,108 @@ static bool omap2_nand_ecc_check(struct omap_nand_info *info,
> >  	return true;
> >  }
> >  
> > +static int omap_ooblayout_ecc(struct mtd_info *mtd, int section,
> > +			      struct mtd_oob_region *oobregion)
> > +{
> > +	struct nand_chip *chip = mtd_to_nand(mtd);
> > +	int off = chip->options & NAND_BUSWIDTH_16 ?
> > +		  BADBLOCK_MARKER_LENGTH : 1;
> 
> IMO "off = 1" is valid only for OMAP_ECC_HAM1_CODE_HW and 8-bit NAND.
> For all other layouts it is always set to BADBLOCK_MARKER_LENGTH.

Indeed.

[...]

> > -	/* all OOB bytes from oobfree->offset till end off OOB are free */
> > -	ecclayout->oobfree->length = mtd->oobsize - ecclayout->oobfree->offset;
> >  	/* check if NAND device's OOB is enough to store ECC signatures */
> > -	if (mtd->oobsize < (ecclayout->eccbytes + BADBLOCK_MARKER_LENGTH)) {
> > +	min_oobbytes = (oobbytes_per_step *
> > +			(mtd->writesize / nand_chip->ecc.size)) +
> > +		       (nand_chip->options & NAND_BUSWIDTH_16 ?
> > +			BADBLOCK_MARKER_LENGTH : 1);
> 
> would it affect this as well?

And here as well.

I've generated a patch (see below) fixing those problems.

> 
> > +	if (mtd->oobsize < min_oobbytes) {
> >  		dev_err(&info->pdev->dev,
> >  			"not enough OOB bytes required = %d, available=%d\n",
> > -			ecclayout->eccbytes, mtd->oobsize);
> > +			min_oobbytes, mtd->oobsize);
> >  		err = -EINVAL;
> >  		goto return_error;
> >  	}
> > 
> 
> I will need to test this change with all possible configurations.
> The number of configurations on OMAP is a bit overwhelming :(.

Sorry about that, but at least now I have someone who can test it :).

Thanks,

Boris

--->8---

diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index 9b96f56..07d4039 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -1640,9 +1640,13 @@ static bool omap2_nand_ecc_check(struct omap_nand_info *info,
 static int omap_ooblayout_ecc(struct mtd_info *mtd, int section,
 			      struct mtd_oob_region *oobregion)
 {
-	struct nand_chip *chip = mtd_to_nand(mtd);
-	int off = chip->options & NAND_BUSWIDTH_16 ?
-		  BADBLOCK_MARKER_LENGTH : 1;
+	struct omap_nand_info *info = mtd_to_omap(mtd);
+	struct nand_chip *chip = &info->nand;
+	int off = BADBLOCK_MARKER_LENGTH;
+
+	if (info->ecc_opt == OMAP_ECC_HAM1_CODE_HW &&
+	    !(chip->options & NAND_BUSWIDTH_16))
+		off = 1;
 
 	if (section)
 		return -ERANGE;
@@ -1656,9 +1660,13 @@ static int omap_ooblayout_ecc(struct mtd_info *mtd, int section,
 static int omap_ooblayout_free(struct mtd_info *mtd, int section,
 			       struct mtd_oob_region *oobregion)
 {
-	struct nand_chip *chip = mtd_to_nand(mtd);
-	int off = chip->options & NAND_BUSWIDTH_16 ?
-		  BADBLOCK_MARKER_LENGTH : 1;
+	struct omap_nand_info *info = mtd_to_omap(mtd);
+	struct nand_chip *chip = &info->nand;
+	int off = BADBLOCK_MARKER_LENGTH;
+
+	if (info->ecc_opt == OMAP_ECC_HAM1_CODE_HW &&
+	    !(chip->options & NAND_BUSWIDTH_16))
+		off = 1;
 
 	if (section)
 		return -ERANGE;
@@ -1682,8 +1690,7 @@ static int omap_sw_ooblayout_ecc(struct mtd_info *mtd, int section,
 				 struct mtd_oob_region *oobregion)
 {
 	struct nand_chip *chip = mtd_to_nand(mtd);
-	int off = chip->options & NAND_BUSWIDTH_16 ?
-		  BADBLOCK_MARKER_LENGTH : 1;
+	int off = BADBLOCK_MARKER_LENGTH;
 
 	if (section >= chip->ecc.steps)
 		return -ERANGE;
@@ -1702,8 +1709,7 @@ static int omap_sw_ooblayout_free(struct mtd_info *mtd, int section,
 				  struct mtd_oob_region *oobregion)
 {
 	struct nand_chip *chip = mtd_to_nand(mtd);
-	int off = chip->options & NAND_BUSWIDTH_16 ?
-		  BADBLOCK_MARKER_LENGTH : 1;
+	int off = BADBLOCK_MARKER_LENGTH;
 
 	if (section)
 		return -ERANGE;
@@ -1737,7 +1743,7 @@ static int omap_nand_probe(struct platform_device *pdev)
 	dma_cap_mask_t			mask;
 	unsigned			sig;
 	struct resource			*res;
-	int				min_oobbytes;
+	int				min_oobbytes = BADBLOCK_MARKER_LENGTH;
 	int				oobbytes_per_step;
 
 	pdata = dev_get_platdata(&pdev->dev);
@@ -1921,6 +1927,9 @@ static int omap_nand_probe(struct platform_device *pdev)
 		nand_chip->ecc.correct          = omap_correct_data;
 		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
 		oobbytes_per_step		= nand_chip->ecc.bytes;
+
+		if (nand_chip->options & NAND_BUSWIDTH_16)
+			min_oobbytes		= 1;
 		break;
 
 	case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
@@ -2038,10 +2047,8 @@ static int omap_nand_probe(struct platform_device *pdev)
 	}
 
 	/* check if NAND device's OOB is enough to store ECC signatures */
-	min_oobbytes = (oobbytes_per_step *
-			(mtd->writesize / nand_chip->ecc.size)) +
-		       (nand_chip->options & NAND_BUSWIDTH_16 ?
-			BADBLOCK_MARKER_LENGTH : 1);
+	min_oobbytes += (oobbytes_per_step *
+			 (mtd->writesize / nand_chip->ecc.size));
 	if (mtd->oobsize < min_oobbytes) {
 		dev_err(&info->pdev->dev,
 			"not enough OOB bytes required = %d, available=%d\n",

Re: [PATCH v5 39/50] mtd: nand: omap2: switch to mtd_ooblayout_ops

[Roger Quadros]

On 18/04/16 18:05, Boris Brezillon wrote:
> On Mon, 18 Apr 2016 17:32:49 +0300
> Roger Quadros <rogerq@ti.com> wrote:
> 
>> Boris,
>>
>> On 30/03/16 19:14, Boris Brezillon wrote:
>>> Implementing the mtd_ooblayout_ops interface is the new way of exposing
>>> ECC/OOB layout to MTD users.
>>>
>>> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
>>> ---
>>>  drivers/mtd/nand/omap2.c | 194 +++++++++++++++++++++++++++--------------------
>>>  1 file changed, 113 insertions(+), 81 deletions(-)
>>>
>>> diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
>>> index 4ebf16b..bca154a 100644
>>> --- a/drivers/mtd/nand/omap2.c
>>> +++ b/drivers/mtd/nand/omap2.c
>>> @@ -169,8 +169,6 @@ struct omap_nand_info {
>>>  	u_char				*buf;
>>>  	int					buf_len;
>>>  	struct gpmc_nand_regs		reg;
>>> -	/* generated at runtime depending on ECC algorithm and layout selected */
>>> -	struct nand_ecclayout		oobinfo;
>>>  	/* fields specific for BCHx_HW ECC scheme */
>>>  	struct device			*elm_dev;
>>>  	struct device_node		*of_node;
>>> @@ -1639,19 +1637,108 @@ static bool omap2_nand_ecc_check(struct omap_nand_info *info,
>>>  	return true;
>>>  }
>>>  
>>> +static int omap_ooblayout_ecc(struct mtd_info *mtd, int section,
>>> +			      struct mtd_oob_region *oobregion)
>>> +{
>>> +	struct nand_chip *chip = mtd_to_nand(mtd);
>>> +	int off = chip->options & NAND_BUSWIDTH_16 ?
>>> +		  BADBLOCK_MARKER_LENGTH : 1;
>>
>> IMO "off = 1" is valid only for OMAP_ECC_HAM1_CODE_HW and 8-bit NAND.
>> For all other layouts it is always set to BADBLOCK_MARKER_LENGTH.
> 
> Indeed.
> 
> [...]
> 
>>> -	/* all OOB bytes from oobfree->offset till end off OOB are free */
>>> -	ecclayout->oobfree->length = mtd->oobsize - ecclayout->oobfree->offset;
>>>  	/* check if NAND device's OOB is enough to store ECC signatures */
>>> -	if (mtd->oobsize < (ecclayout->eccbytes + BADBLOCK_MARKER_LENGTH)) {
>>> +	min_oobbytes = (oobbytes_per_step *
>>> +			(mtd->writesize / nand_chip->ecc.size)) +
>>> +		       (nand_chip->options & NAND_BUSWIDTH_16 ?
>>> +			BADBLOCK_MARKER_LENGTH : 1);
>>
>> would it affect this as well?
> 
> And here as well.
> 
> I've generated a patch (see below) fixing those problems.
> 
>>
>>> +	if (mtd->oobsize < min_oobbytes) {
>>>  		dev_err(&info->pdev->dev,
>>>  			"not enough OOB bytes required = %d, available=%d\n",
>>> -			ecclayout->eccbytes, mtd->oobsize);
>>> +			min_oobbytes, mtd->oobsize);
>>>  		err = -EINVAL;
>>>  		goto return_error;
>>>  	}
>>>
>>
>> I will need to test this change with all possible configurations.
>> The number of configurations on OMAP is a bit overwhelming :(.
> 
> Sorry about that, but at least now I have someone who can test it :).
> 
> Thanks,
> 
> Boris
> 
> --->8---
> 
> diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
> index 9b96f56..07d4039 100644
> --- a/drivers/mtd/nand/omap2.c
> +++ b/drivers/mtd/nand/omap2.c
> @@ -1640,9 +1640,13 @@ static bool omap2_nand_ecc_check(struct omap_nand_info *info,
>  static int omap_ooblayout_ecc(struct mtd_info *mtd, int section,
>  			      struct mtd_oob_region *oobregion)
>  {
> -	struct nand_chip *chip = mtd_to_nand(mtd);
> -	int off = chip->options & NAND_BUSWIDTH_16 ?
> -		  BADBLOCK_MARKER_LENGTH : 1;
> +	struct omap_nand_info *info = mtd_to_omap(mtd);
> +	struct nand_chip *chip = &info->nand;
> +	int off = BADBLOCK_MARKER_LENGTH;
> +
> +	if (info->ecc_opt == OMAP_ECC_HAM1_CODE_HW &&
> +	    !(chip->options & NAND_BUSWIDTH_16))
> +		off = 1;
>  
>  	if (section)
>  		return -ERANGE;
> @@ -1656,9 +1660,13 @@ static int omap_ooblayout_ecc(struct mtd_info *mtd, int section,
>  static int omap_ooblayout_free(struct mtd_info *mtd, int section,
>  			       struct mtd_oob_region *oobregion)
>  {
> -	struct nand_chip *chip = mtd_to_nand(mtd);
> -	int off = chip->options & NAND_BUSWIDTH_16 ?
> -		  BADBLOCK_MARKER_LENGTH : 1;
> +	struct omap_nand_info *info = mtd_to_omap(mtd);
> +	struct nand_chip *chip = &info->nand;
> +	int off = BADBLOCK_MARKER_LENGTH;
> +
> +	if (info->ecc_opt == OMAP_ECC_HAM1_CODE_HW &&
> +	    !(chip->options & NAND_BUSWIDTH_16))
> +		off = 1;
>  
>  	if (section)
>  		return -ERANGE;
> @@ -1682,8 +1690,7 @@ static int omap_sw_ooblayout_ecc(struct mtd_info *mtd, int section,
>  				 struct mtd_oob_region *oobregion)
>  {
>  	struct nand_chip *chip = mtd_to_nand(mtd);
> -	int off = chip->options & NAND_BUSWIDTH_16 ?
> -		  BADBLOCK_MARKER_LENGTH : 1;
> +	int off = BADBLOCK_MARKER_LENGTH;
>  
>  	if (section >= chip->ecc.steps)
>  		return -ERANGE;
> @@ -1702,8 +1709,7 @@ static int omap_sw_ooblayout_free(struct mtd_info *mtd, int section,
>  				  struct mtd_oob_region *oobregion)
>  {
>  	struct nand_chip *chip = mtd_to_nand(mtd);
> -	int off = chip->options & NAND_BUSWIDTH_16 ?
> -		  BADBLOCK_MARKER_LENGTH : 1;
> +	int off = BADBLOCK_MARKER_LENGTH;
>  
>  	if (section)
>  		return -ERANGE;
> @@ -1737,7 +1743,7 @@ static int omap_nand_probe(struct platform_device *pdev)
>  	dma_cap_mask_t			mask;
>  	unsigned			sig;
>  	struct resource			*res;
> -	int				min_oobbytes;
> +	int				min_oobbytes = BADBLOCK_MARKER_LENGTH;
>  	int				oobbytes_per_step;
>  
>  	pdata = dev_get_platdata(&pdev->dev);
> @@ -1921,6 +1927,9 @@ static int omap_nand_probe(struct platform_device *pdev)
>  		nand_chip->ecc.correct          = omap_correct_data;
>  		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
>  		oobbytes_per_step		= nand_chip->ecc.bytes;
> +
> +		if (nand_chip->options & NAND_BUSWIDTH_16)
> +			min_oobbytes		= 1;

Shouldn't this have been
		if (!(nand_chip->options & NAND_BUSWIDTH_16)
			min_oobbytes		= 1;
?

>  		break;
>  
>  	case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
> @@ -2038,10 +2047,8 @@ static int omap_nand_probe(struct platform_device *pdev)
>  	}
>  
>  	/* check if NAND device's OOB is enough to store ECC signatures */
> -	min_oobbytes = (oobbytes_per_step *
> -			(mtd->writesize / nand_chip->ecc.size)) +
> -		       (nand_chip->options & NAND_BUSWIDTH_16 ?
> -			BADBLOCK_MARKER_LENGTH : 1);
> +	min_oobbytes += (oobbytes_per_step *
> +			 (mtd->writesize / nand_chip->ecc.size));
>  	if (mtd->oobsize < min_oobbytes) {
>  		dev_err(&info->pdev->dev,
>  			"not enough OOB bytes required = %d, available=%d\n",
> 

After the above changes BCH with HW ECC worked fine but BCH with SW ECC still failed.
I had to fix it up with the below patch. This is mainly because chip->ecc.steps wasn't
yet initialized before calling nand_bch_init().

After the below patch it worked fine with bch4 (hw & sw), bch8 (hw & sw) and ham1.
I couldn't yet verify bch16 though.

--cheers,
-roger

diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index db22c01..1b1a804 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -1692,7 +1692,7 @@ static int omap_sw_ooblayout_ecc(struct mtd_info *mtd, int section,
 	struct nand_chip *chip = mtd_to_nand(mtd);
 	int off = BADBLOCK_MARKER_LENGTH;
 
-	if (section >= chip->ecc.steps)
+	if (section >= mtd->writesize / chip->ecc.size)	/* ecc steps */
 		return -ERANGE;
 
 	/*
@@ -1711,7 +1711,7 @@ static int omap_sw_ooblayout_free(struct mtd_info *mtd, int section,
 	struct nand_chip *chip = mtd_to_nand(mtd);
 	int off = BADBLOCK_MARKER_LENGTH;
 
-	if (section)
+	if (section >= mtd->writesize / chip->ecc.size) /* ecc steps */
 		return -ERANGE;
 
 	/*
-- 
2.5.0

Re: [PATCH v5 39/50] mtd: nand: omap2: switch to mtd_ooblayout_ops

[Roger Quadros]

On 18/04/16 18:05, Boris Brezillon wrote:
> On Mon, 18 Apr 2016 17:32:49 +0300
> Roger Quadros <rogerq@ti.com> wrote:
> 
>> Boris,
>>
>> On 30/03/16 19:14, Boris Brezillon wrote:
>>> Implementing the mtd_ooblayout_ops interface is the new way of exposing
>>> ECC/OOB layout to MTD users.
>>>
>>> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
>>> ---
>>>  drivers/mtd/nand/omap2.c | 194 +++++++++++++++++++++++++++--------------------
>>>  1 file changed, 113 insertions(+), 81 deletions(-)
>>>
>>> diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
>>> index 4ebf16b..bca154a 100644
>>> --- a/drivers/mtd/nand/omap2.c
>>> +++ b/drivers/mtd/nand/omap2.c
>>> @@ -169,8 +169,6 @@ struct omap_nand_info {
>>>  	u_char				*buf;
>>>  	int					buf_len;
>>>  	struct gpmc_nand_regs		reg;
>>> -	/* generated at runtime depending on ECC algorithm and layout selected */
>>> -	struct nand_ecclayout		oobinfo;
>>>  	/* fields specific for BCHx_HW ECC scheme */
>>>  	struct device			*elm_dev;
>>>  	struct device_node		*of_node;
>>> @@ -1639,19 +1637,108 @@ static bool omap2_nand_ecc_check(struct omap_nand_info *info,
>>>  	return true;
>>>  }
>>>  
>>> +static int omap_ooblayout_ecc(struct mtd_info *mtd, int section,
>>> +			      struct mtd_oob_region *oobregion)
>>> +{
>>> +	struct nand_chip *chip = mtd_to_nand(mtd);
>>> +	int off = chip->options & NAND_BUSWIDTH_16 ?
>>> +		  BADBLOCK_MARKER_LENGTH : 1;
>>
>> IMO "off = 1" is valid only for OMAP_ECC_HAM1_CODE_HW and 8-bit NAND.
>> For all other layouts it is always set to BADBLOCK_MARKER_LENGTH.
> 
> Indeed.
> 
> [...]
> 
>>> -	/* all OOB bytes from oobfree->offset till end off OOB are free */
>>> -	ecclayout->oobfree->length = mtd->oobsize - ecclayout->oobfree->offset;
>>>  	/* check if NAND device's OOB is enough to store ECC signatures */
>>> -	if (mtd->oobsize < (ecclayout->eccbytes + BADBLOCK_MARKER_LENGTH)) {
>>> +	min_oobbytes = (oobbytes_per_step *
>>> +			(mtd->writesize / nand_chip->ecc.size)) +
>>> +		       (nand_chip->options & NAND_BUSWIDTH_16 ?
>>> +			BADBLOCK_MARKER_LENGTH : 1);
>>
>> would it affect this as well?
> 
> And here as well.
> 
> I've generated a patch (see below) fixing those problems.
> 
>>
>>> +	if (mtd->oobsize < min_oobbytes) {
>>>  		dev_err(&info->pdev->dev,
>>>  			"not enough OOB bytes required = %d, available=%d\n",
>>> -			ecclayout->eccbytes, mtd->oobsize);
>>> +			min_oobbytes, mtd->oobsize);
>>>  		err = -EINVAL;
>>>  		goto return_error;
>>>  	}
>>>
>>
>> I will need to test this change with all possible configurations.
>> The number of configurations on OMAP is a bit overwhelming :(.
> 
> Sorry about that, but at least now I have someone who can test it :).
> 
> Thanks,
> 
> Boris
> 
> --->8---
> 
> diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
> index 9b96f56..07d4039 100644
> --- a/drivers/mtd/nand/omap2.c
> +++ b/drivers/mtd/nand/omap2.c
> @@ -1640,9 +1640,13 @@ static bool omap2_nand_ecc_check(struct omap_nand_info *info,
>  static int omap_ooblayout_ecc(struct mtd_info *mtd, int section,
>  			      struct mtd_oob_region *oobregion)
>  {
> -	struct nand_chip *chip = mtd_to_nand(mtd);
> -	int off = chip->options & NAND_BUSWIDTH_16 ?
> -		  BADBLOCK_MARKER_LENGTH : 1;
> +	struct omap_nand_info *info = mtd_to_omap(mtd);
> +	struct nand_chip *chip = &info->nand;
> +	int off = BADBLOCK_MARKER_LENGTH;
> +
> +	if (info->ecc_opt == OMAP_ECC_HAM1_CODE_HW &&
> +	    !(chip->options & NAND_BUSWIDTH_16))
> +		off = 1;
>  
>  	if (section)
>  		return -ERANGE;
> @@ -1656,9 +1660,13 @@ static int omap_ooblayout_ecc(struct mtd_info *mtd, int section,
>  static int omap_ooblayout_free(struct mtd_info *mtd, int section,
>  			       struct mtd_oob_region *oobregion)
>  {
> -	struct nand_chip *chip = mtd_to_nand(mtd);
> -	int off = chip->options & NAND_BUSWIDTH_16 ?
> -		  BADBLOCK_MARKER_LENGTH : 1;
> +	struct omap_nand_info *info = mtd_to_omap(mtd);
> +	struct nand_chip *chip = &info->nand;
> +	int off = BADBLOCK_MARKER_LENGTH;
> +
> +	if (info->ecc_opt == OMAP_ECC_HAM1_CODE_HW &&
> +	    !(chip->options & NAND_BUSWIDTH_16))
> +		off = 1;
>  
>  	if (section)
>  		return -ERANGE;
> @@ -1682,8 +1690,7 @@ static int omap_sw_ooblayout_ecc(struct mtd_info *mtd, int section,
>  				 struct mtd_oob_region *oobregion)
>  {
>  	struct nand_chip *chip = mtd_to_nand(mtd);
> -	int off = chip->options & NAND_BUSWIDTH_16 ?
> -		  BADBLOCK_MARKER_LENGTH : 1;
> +	int off = BADBLOCK_MARKER_LENGTH;
>  
>  	if (section >= chip->ecc.steps)
>  		return -ERANGE;
> @@ -1702,8 +1709,7 @@ static int omap_sw_ooblayout_free(struct mtd_info *mtd, int section,
>  				  struct mtd_oob_region *oobregion)
>  {
>  	struct nand_chip *chip = mtd_to_nand(mtd);
> -	int off = chip->options & NAND_BUSWIDTH_16 ?
> -		  BADBLOCK_MARKER_LENGTH : 1;
> +	int off = BADBLOCK_MARKER_LENGTH;
>  
>  	if (section)
>  		return -ERANGE;
> @@ -1737,7 +1743,7 @@ static int omap_nand_probe(struct platform_device *pdev)
>  	dma_cap_mask_t			mask;
>  	unsigned			sig;
>  	struct resource			*res;
> -	int				min_oobbytes;
> +	int				min_oobbytes = BADBLOCK_MARKER_LENGTH;
>  	int				oobbytes_per_step;
>  
>  	pdata = dev_get_platdata(&pdev->dev);
> @@ -1921,6 +1927,9 @@ static int omap_nand_probe(struct platform_device *pdev)
>  		nand_chip->ecc.correct          = omap_correct_data;
>  		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
>  		oobbytes_per_step		= nand_chip->ecc.bytes;
> +
> +		if (nand_chip->options & NAND_BUSWIDTH_16)
> +			min_oobbytes		= 1;

Shouldn't this have been
		if (!(nand_chip->options & NAND_BUSWIDTH_16)
			min_oobbytes		= 1;
?

>  		break;
>  
>  	case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
> @@ -2038,10 +2047,8 @@ static int omap_nand_probe(struct platform_device *pdev)
>  	}
>  
>  	/* check if NAND device's OOB is enough to store ECC signatures */
> -	min_oobbytes = (oobbytes_per_step *
> -			(mtd->writesize / nand_chip->ecc.size)) +
> -		       (nand_chip->options & NAND_BUSWIDTH_16 ?
> -			BADBLOCK_MARKER_LENGTH : 1);
> +	min_oobbytes += (oobbytes_per_step *
> +			 (mtd->writesize / nand_chip->ecc.size));
>  	if (mtd->oobsize < min_oobbytes) {
>  		dev_err(&info->pdev->dev,
>  			"not enough OOB bytes required = %d, available=%d\n",
> 

After the above changes BCH with HW ECC worked fine but BCH with SW ECC still failed.
I had to fix it up with the below patch. This is mainly because chip->ecc.steps wasn't
yet initialized before calling nand_bch_init().

After the below patch it worked fine with bch4 (hw & sw), bch8 (hw & sw) and ham1.
I couldn't yet verify bch16 though.

--cheers,
-roger

diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index db22c01..1b1a804 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -1692,7 +1692,7 @@ static int omap_sw_ooblayout_ecc(struct mtd_info *mtd, int section,
 	struct nand_chip *chip = mtd_to_nand(mtd);
 	int off = BADBLOCK_MARKER_LENGTH;
 
-	if (section >= chip->ecc.steps)
+	if (section >= mtd->writesize / chip->ecc.size)	/* ecc steps */
 		return -ERANGE;
 
 	/*
@@ -1711,7 +1711,7 @@ static int omap_sw_ooblayout_free(struct mtd_info *mtd, int section,
 	struct nand_chip *chip = mtd_to_nand(mtd);
 	int off = BADBLOCK_MARKER_LENGTH;
 
-	if (section)
+	if (section >= mtd->writesize / chip->ecc.size) /* ecc steps */
 		return -ERANGE;
 
 	/*
-- 
2.5.0

Re: [PATCH v5 39/50] mtd: nand: omap2: switch to mtd_ooblayout_ops

[Roger Quadros]

On 18/04/16 18:05, Boris Brezillon wrote:
> On Mon, 18 Apr 2016 17:32:49 +0300
> Roger Quadros <rogerq@ti.com> wrote:
> 
>> Boris,
>>
>> On 30/03/16 19:14, Boris Brezillon wrote:
>>> Implementing the mtd_ooblayout_ops interface is the new way of exposing
>>> ECC/OOB layout to MTD users.
>>>
>>> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
>>> ---
>>>  drivers/mtd/nand/omap2.c | 194 +++++++++++++++++++++++++++--------------------
>>>  1 file changed, 113 insertions(+), 81 deletions(-)
>>>
>>> diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
>>> index 4ebf16b..bca154a 100644
>>> --- a/drivers/mtd/nand/omap2.c
>>> +++ b/drivers/mtd/nand/omap2.c
>>> @@ -169,8 +169,6 @@ struct omap_nand_info {
>>>  	u_char				*buf;
>>>  	int					buf_len;
>>>  	struct gpmc_nand_regs		reg;
>>> -	/* generated at runtime depending on ECC algorithm and layout selected */
>>> -	struct nand_ecclayout		oobinfo;
>>>  	/* fields specific for BCHx_HW ECC scheme */
>>>  	struct device			*elm_dev;
>>>  	struct device_node		*of_node;
>>> @@ -1639,19 +1637,108 @@ static bool omap2_nand_ecc_check(struct omap_nand_info *info,
>>>  	return true;
>>>  }
>>>  
>>> +static int omap_ooblayout_ecc(struct mtd_info *mtd, int section,
>>> +			      struct mtd_oob_region *oobregion)
>>> +{
>>> +	struct nand_chip *chip = mtd_to_nand(mtd);
>>> +	int off = chip->options & NAND_BUSWIDTH_16 ?
>>> +		  BADBLOCK_MARKER_LENGTH : 1;
>>
>> IMO "off = 1" is valid only for OMAP_ECC_HAM1_CODE_HW and 8-bit NAND.
>> For all other layouts it is always set to BADBLOCK_MARKER_LENGTH.
> 
> Indeed.
> 
> [...]
> 
>>> -	/* all OOB bytes from oobfree->offset till end off OOB are free */
>>> -	ecclayout->oobfree->length = mtd->oobsize - ecclayout->oobfree->offset;
>>>  	/* check if NAND device's OOB is enough to store ECC signatures */
>>> -	if (mtd->oobsize < (ecclayout->eccbytes + BADBLOCK_MARKER_LENGTH)) {
>>> +	min_oobbytes = (oobbytes_per_step *
>>> +			(mtd->writesize / nand_chip->ecc.size)) +
>>> +		       (nand_chip->options & NAND_BUSWIDTH_16 ?
>>> +			BADBLOCK_MARKER_LENGTH : 1);
>>
>> would it affect this as well?
> 
> And here as well.
> 
> I've generated a patch (see below) fixing those problems.
> 
>>
>>> +	if (mtd->oobsize < min_oobbytes) {
>>>  		dev_err(&info->pdev->dev,
>>>  			"not enough OOB bytes required = %d, available=%d\n",
>>> -			ecclayout->eccbytes, mtd->oobsize);
>>> +			min_oobbytes, mtd->oobsize);
>>>  		err = -EINVAL;
>>>  		goto return_error;
>>>  	}
>>>
>>
>> I will need to test this change with all possible configurations.
>> The number of configurations on OMAP is a bit overwhelming :(.
> 
> Sorry about that, but at least now I have someone who can test it :).
> 
> Thanks,
> 
> Boris
> 
> --->8---
> 
> diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
> index 9b96f56..07d4039 100644
> --- a/drivers/mtd/nand/omap2.c
> +++ b/drivers/mtd/nand/omap2.c
> @@ -1640,9 +1640,13 @@ static bool omap2_nand_ecc_check(struct omap_nand_info *info,
>  static int omap_ooblayout_ecc(struct mtd_info *mtd, int section,
>  			      struct mtd_oob_region *oobregion)
>  {
> -	struct nand_chip *chip = mtd_to_nand(mtd);
> -	int off = chip->options & NAND_BUSWIDTH_16 ?
> -		  BADBLOCK_MARKER_LENGTH : 1;
> +	struct omap_nand_info *info = mtd_to_omap(mtd);
> +	struct nand_chip *chip = &info->nand;
> +	int off = BADBLOCK_MARKER_LENGTH;
> +
> +	if (info->ecc_opt == OMAP_ECC_HAM1_CODE_HW &&
> +	    !(chip->options & NAND_BUSWIDTH_16))
> +		off = 1;
>  
>  	if (section)
>  		return -ERANGE;
> @@ -1656,9 +1660,13 @@ static int omap_ooblayout_ecc(struct mtd_info *mtd, int section,
>  static int omap_ooblayout_free(struct mtd_info *mtd, int section,
>  			       struct mtd_oob_region *oobregion)
>  {
> -	struct nand_chip *chip = mtd_to_nand(mtd);
> -	int off = chip->options & NAND_BUSWIDTH_16 ?
> -		  BADBLOCK_MARKER_LENGTH : 1;
> +	struct omap_nand_info *info = mtd_to_omap(mtd);
> +	struct nand_chip *chip = &info->nand;
> +	int off = BADBLOCK_MARKER_LENGTH;
> +
> +	if (info->ecc_opt == OMAP_ECC_HAM1_CODE_HW &&
> +	    !(chip->options & NAND_BUSWIDTH_16))
> +		off = 1;
>  
>  	if (section)
>  		return -ERANGE;
> @@ -1682,8 +1690,7 @@ static int omap_sw_ooblayout_ecc(struct mtd_info *mtd, int section,
>  				 struct mtd_oob_region *oobregion)
>  {
>  	struct nand_chip *chip = mtd_to_nand(mtd);
> -	int off = chip->options & NAND_BUSWIDTH_16 ?
> -		  BADBLOCK_MARKER_LENGTH : 1;
> +	int off = BADBLOCK_MARKER_LENGTH;
>  
>  	if (section >= chip->ecc.steps)
>  		return -ERANGE;
> @@ -1702,8 +1709,7 @@ static int omap_sw_ooblayout_free(struct mtd_info *mtd, int section,
>  				  struct mtd_oob_region *oobregion)
>  {
>  	struct nand_chip *chip = mtd_to_nand(mtd);
> -	int off = chip->options & NAND_BUSWIDTH_16 ?
> -		  BADBLOCK_MARKER_LENGTH : 1;
> +	int off = BADBLOCK_MARKER_LENGTH;
>  
>  	if (section)
>  		return -ERANGE;
> @@ -1737,7 +1743,7 @@ static int omap_nand_probe(struct platform_device *pdev)
>  	dma_cap_mask_t			mask;
>  	unsigned			sig;
>  	struct resource			*res;
> -	int				min_oobbytes;
> +	int				min_oobbytes = BADBLOCK_MARKER_LENGTH;
>  	int				oobbytes_per_step;
>  
>  	pdata = dev_get_platdata(&pdev->dev);
> @@ -1921,6 +1927,9 @@ static int omap_nand_probe(struct platform_device *pdev)
>  		nand_chip->ecc.correct          = omap_correct_data;
>  		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
>  		oobbytes_per_step		= nand_chip->ecc.bytes;
> +
> +		if (nand_chip->options & NAND_BUSWIDTH_16)
> +			min_oobbytes		= 1;

Shouldn't this have been
		if (!(nand_chip->options & NAND_BUSWIDTH_16)
			min_oobbytes		= 1;
?

>  		break;
>  
>  	case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
> @@ -2038,10 +2047,8 @@ static int omap_nand_probe(struct platform_device *pdev)
>  	}
>  
>  	/* check if NAND device's OOB is enough to store ECC signatures */
> -	min_oobbytes = (oobbytes_per_step *
> -			(mtd->writesize / nand_chip->ecc.size)) +
> -		       (nand_chip->options & NAND_BUSWIDTH_16 ?
> -			BADBLOCK_MARKER_LENGTH : 1);
> +	min_oobbytes += (oobbytes_per_step *
> +			 (mtd->writesize / nand_chip->ecc.size));
>  	if (mtd->oobsize < min_oobbytes) {
>  		dev_err(&info->pdev->dev,
>  			"not enough OOB bytes required = %d, available=%d\n",
> 

After the above changes BCH with HW ECC worked fine but BCH with SW ECC still failed.
I had to fix it up with the below patch. This is mainly because chip->ecc.steps wasn't
yet initialized before calling nand_bch_init().

After the below patch it worked fine with bch4 (hw & sw), bch8 (hw & sw) and ham1.
I couldn't yet verify bch16 though.

--cheers,
-roger

diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index db22c01..1b1a804 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -1692,7 +1692,7 @@ static int omap_sw_ooblayout_ecc(struct mtd_info *mtd, int section,
 	struct nand_chip *chip = mtd_to_nand(mtd);
 	int off = BADBLOCK_MARKER_LENGTH;
 
-	if (section >= chip->ecc.steps)
+	if (section >= mtd->writesize / chip->ecc.size)	/* ecc steps */
 		return -ERANGE;
 
 	/*
@@ -1711,7 +1711,7 @@ static int omap_sw_ooblayout_free(struct mtd_info *mtd, int section,
 	struct nand_chip *chip = mtd_to_nand(mtd);
 	int off = BADBLOCK_MARKER_LENGTH;
 
-	if (section)
+	if (section >= mtd->writesize / chip->ecc.size) /* ecc steps */
 		return -ERANGE;
 
 	/*
-- 
2.5.0

[PATCH v5 39/50] mtd: nand: omap2: switch to mtd_ooblayout_ops

[Roger Quadros]

On 18/04/16 18:05, Boris Brezillon wrote:
> On Mon, 18 Apr 2016 17:32:49 +0300
> Roger Quadros <rogerq@ti.com> wrote:
> 
>> Boris,
>>
>> On 30/03/16 19:14, Boris Brezillon wrote:
>>> Implementing the mtd_ooblayout_ops interface is the new way of exposing
>>> ECC/OOB layout to MTD users.
>>>
>>> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
>>> ---
>>>  drivers/mtd/nand/omap2.c | 194 +++++++++++++++++++++++++++--------------------
>>>  1 file changed, 113 insertions(+), 81 deletions(-)
>>>
>>> diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
>>> index 4ebf16b..bca154a 100644
>>> --- a/drivers/mtd/nand/omap2.c
>>> +++ b/drivers/mtd/nand/omap2.c
>>> @@ -169,8 +169,6 @@ struct omap_nand_info {
>>>  	u_char				*buf;
>>>  	int					buf_len;
>>>  	struct gpmc_nand_regs		reg;
>>> -	/* generated at runtime depending on ECC algorithm and layout selected */
>>> -	struct nand_ecclayout		oobinfo;
>>>  	/* fields specific for BCHx_HW ECC scheme */
>>>  	struct device			*elm_dev;
>>>  	struct device_node		*of_node;
>>> @@ -1639,19 +1637,108 @@ static bool omap2_nand_ecc_check(struct omap_nand_info *info,
>>>  	return true;
>>>  }
>>>  
>>> +static int omap_ooblayout_ecc(struct mtd_info *mtd, int section,
>>> +			      struct mtd_oob_region *oobregion)
>>> +{
>>> +	struct nand_chip *chip = mtd_to_nand(mtd);
>>> +	int off = chip->options & NAND_BUSWIDTH_16 ?
>>> +		  BADBLOCK_MARKER_LENGTH : 1;
>>
>> IMO "off = 1" is valid only for OMAP_ECC_HAM1_CODE_HW and 8-bit NAND.
>> For all other layouts it is always set to BADBLOCK_MARKER_LENGTH.
> 
> Indeed.
> 
> [...]
> 
>>> -	/* all OOB bytes from oobfree->offset till end off OOB are free */
>>> -	ecclayout->oobfree->length = mtd->oobsize - ecclayout->oobfree->offset;
>>>  	/* check if NAND device's OOB is enough to store ECC signatures */
>>> -	if (mtd->oobsize < (ecclayout->eccbytes + BADBLOCK_MARKER_LENGTH)) {
>>> +	min_oobbytes = (oobbytes_per_step *
>>> +			(mtd->writesize / nand_chip->ecc.size)) +
>>> +		       (nand_chip->options & NAND_BUSWIDTH_16 ?
>>> +			BADBLOCK_MARKER_LENGTH : 1);
>>
>> would it affect this as well?
> 
> And here as well.
> 
> I've generated a patch (see below) fixing those problems.
> 
>>
>>> +	if (mtd->oobsize < min_oobbytes) {
>>>  		dev_err(&info->pdev->dev,
>>>  			"not enough OOB bytes required = %d, available=%d\n",
>>> -			ecclayout->eccbytes, mtd->oobsize);
>>> +			min_oobbytes, mtd->oobsize);
>>>  		err = -EINVAL;
>>>  		goto return_error;
>>>  	}
>>>
>>
>> I will need to test this change with all possible configurations.
>> The number of configurations on OMAP is a bit overwhelming :(.
> 
> Sorry about that, but at least now I have someone who can test it :).
> 
> Thanks,
> 
> Boris
> 
> --->8---
> 
> diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
> index 9b96f56..07d4039 100644
> --- a/drivers/mtd/nand/omap2.c
> +++ b/drivers/mtd/nand/omap2.c
> @@ -1640,9 +1640,13 @@ static bool omap2_nand_ecc_check(struct omap_nand_info *info,
>  static int omap_ooblayout_ecc(struct mtd_info *mtd, int section,
>  			      struct mtd_oob_region *oobregion)
>  {
> -	struct nand_chip *chip = mtd_to_nand(mtd);
> -	int off = chip->options & NAND_BUSWIDTH_16 ?
> -		  BADBLOCK_MARKER_LENGTH : 1;
> +	struct omap_nand_info *info = mtd_to_omap(mtd);
> +	struct nand_chip *chip = &info->nand;
> +	int off = BADBLOCK_MARKER_LENGTH;
> +
> +	if (info->ecc_opt == OMAP_ECC_HAM1_CODE_HW &&
> +	    !(chip->options & NAND_BUSWIDTH_16))
> +		off = 1;
>  
>  	if (section)
>  		return -ERANGE;
> @@ -1656,9 +1660,13 @@ static int omap_ooblayout_ecc(struct mtd_info *mtd, int section,
>  static int omap_ooblayout_free(struct mtd_info *mtd, int section,
>  			       struct mtd_oob_region *oobregion)
>  {
> -	struct nand_chip *chip = mtd_to_nand(mtd);
> -	int off = chip->options & NAND_BUSWIDTH_16 ?
> -		  BADBLOCK_MARKER_LENGTH : 1;
> +	struct omap_nand_info *info = mtd_to_omap(mtd);
> +	struct nand_chip *chip = &info->nand;
> +	int off = BADBLOCK_MARKER_LENGTH;
> +
> +	if (info->ecc_opt == OMAP_ECC_HAM1_CODE_HW &&
> +	    !(chip->options & NAND_BUSWIDTH_16))
> +		off = 1;
>  
>  	if (section)
>  		return -ERANGE;
> @@ -1682,8 +1690,7 @@ static int omap_sw_ooblayout_ecc(struct mtd_info *mtd, int section,
>  				 struct mtd_oob_region *oobregion)
>  {
>  	struct nand_chip *chip = mtd_to_nand(mtd);
> -	int off = chip->options & NAND_BUSWIDTH_16 ?
> -		  BADBLOCK_MARKER_LENGTH : 1;
> +	int off = BADBLOCK_MARKER_LENGTH;
>  
>  	if (section >= chip->ecc.steps)
>  		return -ERANGE;
> @@ -1702,8 +1709,7 @@ static int omap_sw_ooblayout_free(struct mtd_info *mtd, int section,
>  				  struct mtd_oob_region *oobregion)
>  {
>  	struct nand_chip *chip = mtd_to_nand(mtd);
> -	int off = chip->options & NAND_BUSWIDTH_16 ?
> -		  BADBLOCK_MARKER_LENGTH : 1;
> +	int off = BADBLOCK_MARKER_LENGTH;
>  
>  	if (section)
>  		return -ERANGE;
> @@ -1737,7 +1743,7 @@ static int omap_nand_probe(struct platform_device *pdev)
>  	dma_cap_mask_t			mask;
>  	unsigned			sig;
>  	struct resource			*res;
> -	int				min_oobbytes;
> +	int				min_oobbytes = BADBLOCK_MARKER_LENGTH;
>  	int				oobbytes_per_step;
>  
>  	pdata = dev_get_platdata(&pdev->dev);
> @@ -1921,6 +1927,9 @@ static int omap_nand_probe(struct platform_device *pdev)
>  		nand_chip->ecc.correct          = omap_correct_data;
>  		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
>  		oobbytes_per_step		= nand_chip->ecc.bytes;
> +
> +		if (nand_chip->options & NAND_BUSWIDTH_16)
> +			min_oobbytes		= 1;

Shouldn't this have been
		if (!(nand_chip->options & NAND_BUSWIDTH_16)
			min_oobbytes		= 1;
?

>  		break;
>  
>  	case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
> @@ -2038,10 +2047,8 @@ static int omap_nand_probe(struct platform_device *pdev)
>  	}
>  
>  	/* check if NAND device's OOB is enough to store ECC signatures */
> -	min_oobbytes = (oobbytes_per_step *
> -			(mtd->writesize / nand_chip->ecc.size)) +
> -		       (nand_chip->options & NAND_BUSWIDTH_16 ?
> -			BADBLOCK_MARKER_LENGTH : 1);
> +	min_oobbytes += (oobbytes_per_step *
> +			 (mtd->writesize / nand_chip->ecc.size));
>  	if (mtd->oobsize < min_oobbytes) {
>  		dev_err(&info->pdev->dev,
>  			"not enough OOB bytes required = %d, available=%d\n",
> 

After the above changes BCH with HW ECC worked fine but BCH with SW ECC still failed.
I had to fix it up with the below patch. This is mainly because chip->ecc.steps wasn't
yet initialized before calling nand_bch_init().

After the below patch it worked fine with bch4 (hw & sw), bch8 (hw & sw) and ham1.
I couldn't yet verify bch16 though.

--cheers,
-roger

diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index db22c01..1b1a804 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -1692,7 +1692,7 @@ static int omap_sw_ooblayout_ecc(struct mtd_info *mtd, int section,
 	struct nand_chip *chip = mtd_to_nand(mtd);
 	int off = BADBLOCK_MARKER_LENGTH;
 
-	if (section >= chip->ecc.steps)
+	if (section >= mtd->writesize / chip->ecc.size)	/* ecc steps */
 		return -ERANGE;
 
 	/*
@@ -1711,7 +1711,7 @@ static int omap_sw_ooblayout_free(struct mtd_info *mtd, int section,
 	struct nand_chip *chip = mtd_to_nand(mtd);
 	int off = BADBLOCK_MARKER_LENGTH;
 
-	if (section)
+	if (section >= mtd->writesize / chip->ecc.size) /* ecc steps */
 		return -ERANGE;
 
 	/*
-- 
2.5.0

Re: [PATCH v5 39/50] mtd: nand: omap2: switch to mtd_ooblayout_ops

[Boris Brezillon]

Hi Roger,

On Tue, 19 Apr 2016 13:28:50 +0300
Roger Quadros <rogerq@ti.com> wrote:

> > @@ -1921,6 +1927,9 @@ static int omap_nand_probe(struct platform_device *pdev)
> >  		nand_chip->ecc.correct          = omap_correct_data;
> >  		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
> >  		oobbytes_per_step		= nand_chip->ecc.bytes;
> > +
> > +		if (nand_chip->options & NAND_BUSWIDTH_16)
> > +			min_oobbytes		= 1;
> 
> Shouldn't this have been
> 		if (!(nand_chip->options & NAND_BUSWIDTH_16)
> 			min_oobbytes		= 1;
> ?

Yep.

> 
> >  		break;
> >  
> >  	case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
> > @@ -2038,10 +2047,8 @@ static int omap_nand_probe(struct platform_device *pdev)
> >  	}
> >  
> >  	/* check if NAND device's OOB is enough to store ECC signatures */
> > -	min_oobbytes = (oobbytes_per_step *
> > -			(mtd->writesize / nand_chip->ecc.size)) +
> > -		       (nand_chip->options & NAND_BUSWIDTH_16 ?
> > -			BADBLOCK_MARKER_LENGTH : 1);
> > +	min_oobbytes += (oobbytes_per_step *
> > +			 (mtd->writesize / nand_chip->ecc.size));
> >  	if (mtd->oobsize < min_oobbytes) {
> >  		dev_err(&info->pdev->dev,
> >  			"not enough OOB bytes required = %d, available=%d\n",
> > 
> 
> After the above changes BCH with HW ECC worked fine but BCH with SW ECC still failed.
> I had to fix it up with the below patch. This is mainly because chip->ecc.steps wasn't
> yet initialized before calling nand_bch_init().
> 
> After the below patch it worked fine with bch4 (hw & sw), bch8 (hw & sw) and ham1.
> I couldn't yet verify bch16 though.

Thanks for the fix, but I'd prefer fixing the bug for all soft BCH
users.

Could you try this patch?

--->8---

diff --git a/drivers/mtd/nand/nand_bch.c b/drivers/mtd/nand/nand_bch.c
index ca9b2a4..3ca3d39 100644
--- a/drivers/mtd/nand/nand_bch.c
+++ b/drivers/mtd/nand/nand_bch.c
@@ -177,6 +177,16 @@ struct nand_bch_control *nand_bch_init(struct mtd_info *mtd)
 		goto fail;
 	}
 
+	/*
+	 * ecc->steps and ecc->total might be used by mtd->ooblayout->ecc(),
+	 * which is called by mtd_ooblayout_count_eccbytes().
+	 * Make sure they are properly initialized before calling
+	 * mtd_ooblayout_count_eccbytes().
+	 * FIXME: we should probaly rework the sequencing in nand_scan_tail()
+	 * to avoid setting those fields twice.
+	 */
+	nand->ecc.steps = eccsteps;
+	nand->ecc.total = eccsteps * eccbytes;
 	if (mtd_ooblayout_count_eccbytes(mtd) != (eccsteps*eccbytes)) {
 		printk(KERN_WARNING "invalid ecc layout\n");
 		goto fail;

Re: [PATCH v5 39/50] mtd: nand: omap2: switch to mtd_ooblayout_ops

[Boris Brezillon]

Hi Roger,

On Tue, 19 Apr 2016 13:28:50 +0300
Roger Quadros <rogerq-l0cyMroinI0@public.gmane.org> wrote:

> > @@ -1921,6 +1927,9 @@ static int omap_nand_probe(struct platform_device *pdev)
> >  		nand_chip->ecc.correct          = omap_correct_data;
> >  		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
> >  		oobbytes_per_step		= nand_chip->ecc.bytes;
> > +
> > +		if (nand_chip->options & NAND_BUSWIDTH_16)
> > +			min_oobbytes		= 1;
> 
> Shouldn't this have been
> 		if (!(nand_chip->options & NAND_BUSWIDTH_16)
> 			min_oobbytes		= 1;
> ?

Yep.

> 
> >  		break;
> >  
> >  	case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
> > @@ -2038,10 +2047,8 @@ static int omap_nand_probe(struct platform_device *pdev)
> >  	}
> >  
> >  	/* check if NAND device's OOB is enough to store ECC signatures */
> > -	min_oobbytes = (oobbytes_per_step *
> > -			(mtd->writesize / nand_chip->ecc.size)) +
> > -		       (nand_chip->options & NAND_BUSWIDTH_16 ?
> > -			BADBLOCK_MARKER_LENGTH : 1);
> > +	min_oobbytes += (oobbytes_per_step *
> > +			 (mtd->writesize / nand_chip->ecc.size));
> >  	if (mtd->oobsize < min_oobbytes) {
> >  		dev_err(&info->pdev->dev,
> >  			"not enough OOB bytes required = %d, available=%d\n",
> > 
> 
> After the above changes BCH with HW ECC worked fine but BCH with SW ECC still failed.
> I had to fix it up with the below patch. This is mainly because chip->ecc.steps wasn't
> yet initialized before calling nand_bch_init().
> 
> After the below patch it worked fine with bch4 (hw & sw), bch8 (hw & sw) and ham1.
> I couldn't yet verify bch16 though.

Thanks for the fix, but I'd prefer fixing the bug for all soft BCH
users.

Could you try this patch?

--->8---

diff --git a/drivers/mtd/nand/nand_bch.c b/drivers/mtd/nand/nand_bch.c
index ca9b2a4..3ca3d39 100644
--- a/drivers/mtd/nand/nand_bch.c
+++ b/drivers/mtd/nand/nand_bch.c
@@ -177,6 +177,16 @@ struct nand_bch_control *nand_bch_init(struct mtd_info *mtd)
 		goto fail;
 	}
 
+	/*
+	 * ecc->steps and ecc->total might be used by mtd->ooblayout->ecc(),
+	 * which is called by mtd_ooblayout_count_eccbytes().
+	 * Make sure they are properly initialized before calling
+	 * mtd_ooblayout_count_eccbytes().
+	 * FIXME: we should probaly rework the sequencing in nand_scan_tail()
+	 * to avoid setting those fields twice.
+	 */
+	nand->ecc.steps = eccsteps;
+	nand->ecc.total = eccsteps * eccbytes;
 	if (mtd_ooblayout_count_eccbytes(mtd) != (eccsteps*eccbytes)) {
 		printk(KERN_WARNING "invalid ecc layout\n");
 		goto fail;

Re: [PATCH v5 39/50] mtd: nand: omap2: switch to mtd_ooblayout_ops

[Boris Brezillon]

Hi Roger,

On Tue, 19 Apr 2016 13:28:50 +0300
Roger Quadros <rogerq@ti.com> wrote:

> > @@ -1921,6 +1927,9 @@ static int omap_nand_probe(struct platform_device *pdev)
> >  		nand_chip->ecc.correct          = omap_correct_data;
> >  		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
> >  		oobbytes_per_step		= nand_chip->ecc.bytes;
> > +
> > +		if (nand_chip->options & NAND_BUSWIDTH_16)
> > +			min_oobbytes		= 1;
> 
> Shouldn't this have been
> 		if (!(nand_chip->options & NAND_BUSWIDTH_16)
> 			min_oobbytes		= 1;
> ?

Yep.

> 
> >  		break;
> >  
> >  	case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
> > @@ -2038,10 +2047,8 @@ static int omap_nand_probe(struct platform_device *pdev)
> >  	}
> >  
> >  	/* check if NAND device's OOB is enough to store ECC signatures */
> > -	min_oobbytes = (oobbytes_per_step *
> > -			(mtd->writesize / nand_chip->ecc.size)) +
> > -		       (nand_chip->options & NAND_BUSWIDTH_16 ?
> > -			BADBLOCK_MARKER_LENGTH : 1);
> > +	min_oobbytes += (oobbytes_per_step *
> > +			 (mtd->writesize / nand_chip->ecc.size));
> >  	if (mtd->oobsize < min_oobbytes) {
> >  		dev_err(&info->pdev->dev,
> >  			"not enough OOB bytes required = %d, available=%d\n",
> > 
> 
> After the above changes BCH with HW ECC worked fine but BCH with SW ECC still failed.
> I had to fix it up with the below patch. This is mainly because chip->ecc.steps wasn't
> yet initialized before calling nand_bch_init().
> 
> After the below patch it worked fine with bch4 (hw & sw), bch8 (hw & sw) and ham1.
> I couldn't yet verify bch16 though.

Thanks for the fix, but I'd prefer fixing the bug for all soft BCH
users.

Could you try this patch?

--->8---

diff --git a/drivers/mtd/nand/nand_bch.c b/drivers/mtd/nand/nand_bch.c
index ca9b2a4..3ca3d39 100644
--- a/drivers/mtd/nand/nand_bch.c
+++ b/drivers/mtd/nand/nand_bch.c
@@ -177,6 +177,16 @@ struct nand_bch_control *nand_bch_init(struct mtd_info *mtd)
 		goto fail;
 	}
 
+	/*
+	 * ecc->steps and ecc->total might be used by mtd->ooblayout->ecc(),
+	 * which is called by mtd_ooblayout_count_eccbytes().
+	 * Make sure they are properly initialized before calling
+	 * mtd_ooblayout_count_eccbytes().
+	 * FIXME: we should probaly rework the sequencing in nand_scan_tail()
+	 * to avoid setting those fields twice.
+	 */
+	nand->ecc.steps = eccsteps;
+	nand->ecc.total = eccsteps * eccbytes;
 	if (mtd_ooblayout_count_eccbytes(mtd) != (eccsteps*eccbytes)) {
 		printk(KERN_WARNING "invalid ecc layout\n");
 		goto fail;

[PATCH v5 39/50] mtd: nand: omap2: switch to mtd_ooblayout_ops

[Boris Brezillon]

Hi Roger,

On Tue, 19 Apr 2016 13:28:50 +0300
Roger Quadros <rogerq@ti.com> wrote:

> > @@ -1921,6 +1927,9 @@ static int omap_nand_probe(struct platform_device *pdev)
> >  		nand_chip->ecc.correct          = omap_correct_data;
> >  		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
> >  		oobbytes_per_step		= nand_chip->ecc.bytes;
> > +
> > +		if (nand_chip->options & NAND_BUSWIDTH_16)
> > +			min_oobbytes		= 1;
> 
> Shouldn't this have been
> 		if (!(nand_chip->options & NAND_BUSWIDTH_16)
> 			min_oobbytes		= 1;
> ?

Yep.

> 
> >  		break;
> >  
> >  	case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
> > @@ -2038,10 +2047,8 @@ static int omap_nand_probe(struct platform_device *pdev)
> >  	}
> >  
> >  	/* check if NAND device's OOB is enough to store ECC signatures */
> > -	min_oobbytes = (oobbytes_per_step *
> > -			(mtd->writesize / nand_chip->ecc.size)) +
> > -		       (nand_chip->options & NAND_BUSWIDTH_16 ?
> > -			BADBLOCK_MARKER_LENGTH : 1);
> > +	min_oobbytes += (oobbytes_per_step *
> > +			 (mtd->writesize / nand_chip->ecc.size));
> >  	if (mtd->oobsize < min_oobbytes) {
> >  		dev_err(&info->pdev->dev,
> >  			"not enough OOB bytes required = %d, available=%d\n",
> > 
> 
> After the above changes BCH with HW ECC worked fine but BCH with SW ECC still failed.
> I had to fix it up with the below patch. This is mainly because chip->ecc.steps wasn't
> yet initialized before calling nand_bch_init().
> 
> After the below patch it worked fine with bch4 (hw & sw), bch8 (hw & sw) and ham1.
> I couldn't yet verify bch16 though.

Thanks for the fix, but I'd prefer fixing the bug for all soft BCH
users.

Could you try this patch?

--->8---

diff --git a/drivers/mtd/nand/nand_bch.c b/drivers/mtd/nand/nand_bch.c
index ca9b2a4..3ca3d39 100644
--- a/drivers/mtd/nand/nand_bch.c
+++ b/drivers/mtd/nand/nand_bch.c
@@ -177,6 +177,16 @@ struct nand_bch_control *nand_bch_init(struct mtd_info *mtd)
 		goto fail;
 	}
 
+	/*
+	 * ecc->steps and ecc->total might be used by mtd->ooblayout->ecc(),
+	 * which is called by mtd_ooblayout_count_eccbytes().
+	 * Make sure they are properly initialized before calling
+	 * mtd_ooblayout_count_eccbytes().
+	 * FIXME: we should probaly rework the sequencing in nand_scan_tail()
+	 * to avoid setting those fields twice.
+	 */
+	nand->ecc.steps = eccsteps;
+	nand->ecc.total = eccsteps * eccbytes;
 	if (mtd_ooblayout_count_eccbytes(mtd) != (eccsteps*eccbytes)) {
 		printk(KERN_WARNING "invalid ecc layout\n");
 		goto fail;

Re: [PATCH v5 39/50] mtd: nand: omap2: switch to mtd_ooblayout_ops

[Roger Quadros]

On 19/04/16 14:22, Boris Brezillon wrote:
> Hi Roger,
> 
> On Tue, 19 Apr 2016 13:28:50 +0300
> Roger Quadros <rogerq@ti.com> wrote:
> 
>>> @@ -1921,6 +1927,9 @@ static int omap_nand_probe(struct platform_device *pdev)
>>>  		nand_chip->ecc.correct          = omap_correct_data;
>>>  		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
>>>  		oobbytes_per_step		= nand_chip->ecc.bytes;
>>> +
>>> +		if (nand_chip->options & NAND_BUSWIDTH_16)
>>> +			min_oobbytes		= 1;
>>
>> Shouldn't this have been
>> 		if (!(nand_chip->options & NAND_BUSWIDTH_16)
>> 			min_oobbytes		= 1;
>> ?
> 
> Yep.
> 
>>
>>>  		break;
>>>  
>>>  	case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
>>> @@ -2038,10 +2047,8 @@ static int omap_nand_probe(struct platform_device *pdev)
>>>  	}
>>>  
>>>  	/* check if NAND device's OOB is enough to store ECC signatures */
>>> -	min_oobbytes = (oobbytes_per_step *
>>> -			(mtd->writesize / nand_chip->ecc.size)) +
>>> -		       (nand_chip->options & NAND_BUSWIDTH_16 ?
>>> -			BADBLOCK_MARKER_LENGTH : 1);
>>> +	min_oobbytes += (oobbytes_per_step *
>>> +			 (mtd->writesize / nand_chip->ecc.size));
>>>  	if (mtd->oobsize < min_oobbytes) {
>>>  		dev_err(&info->pdev->dev,
>>>  			"not enough OOB bytes required = %d, available=%d\n",
>>>
>>
>> After the above changes BCH with HW ECC worked fine but BCH with SW ECC still failed.
>> I had to fix it up with the below patch. This is mainly because chip->ecc.steps wasn't
>> yet initialized before calling nand_bch_init().
>>
>> After the below patch it worked fine with bch4 (hw & sw), bch8 (hw & sw) and ham1.
>> I couldn't yet verify bch16 though.
> 

I just verified that bch16 works as well.

> Thanks for the fix, but I'd prefer fixing the bug for all soft BCH
> users.
> 
> Could you try this patch?

I tried your patch and it worked fine.
You will still need the below change to omap2.c

--
cheers,
-roger

diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index 0abfba6..33c8fde 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -1715,7 +1715,7 @@ static int omap_sw_ooblayout_free(struct mtd_info *mtd, int section,
 	struct nand_chip *chip = mtd_to_nand(mtd);
 	int off = BADBLOCK_MARKER_LENGTH;
 
-	if (section)
+	if (section >= chip->ecc.steps)
 		return -ERANGE;
 
 	/*
-- 
2.5.0

Re: [PATCH v5 39/50] mtd: nand: omap2: switch to mtd_ooblayout_ops

[Roger Quadros]

On 19/04/16 14:22, Boris Brezillon wrote:
> Hi Roger,
> 
> On Tue, 19 Apr 2016 13:28:50 +0300
> Roger Quadros <rogerq-l0cyMroinI0@public.gmane.org> wrote:
> 
>>> @@ -1921,6 +1927,9 @@ static int omap_nand_probe(struct platform_device *pdev)
>>>  		nand_chip->ecc.correct          = omap_correct_data;
>>>  		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
>>>  		oobbytes_per_step		= nand_chip->ecc.bytes;
>>> +
>>> +		if (nand_chip->options & NAND_BUSWIDTH_16)
>>> +			min_oobbytes		= 1;
>>
>> Shouldn't this have been
>> 		if (!(nand_chip->options & NAND_BUSWIDTH_16)
>> 			min_oobbytes		= 1;
>> ?
> 
> Yep.
> 
>>
>>>  		break;
>>>  
>>>  	case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
>>> @@ -2038,10 +2047,8 @@ static int omap_nand_probe(struct platform_device *pdev)
>>>  	}
>>>  
>>>  	/* check if NAND device's OOB is enough to store ECC signatures */
>>> -	min_oobbytes = (oobbytes_per_step *
>>> -			(mtd->writesize / nand_chip->ecc.size)) +
>>> -		       (nand_chip->options & NAND_BUSWIDTH_16 ?
>>> -			BADBLOCK_MARKER_LENGTH : 1);
>>> +	min_oobbytes += (oobbytes_per_step *
>>> +			 (mtd->writesize / nand_chip->ecc.size));
>>>  	if (mtd->oobsize < min_oobbytes) {
>>>  		dev_err(&info->pdev->dev,
>>>  			"not enough OOB bytes required = %d, available=%d\n",
>>>
>>
>> After the above changes BCH with HW ECC worked fine but BCH with SW ECC still failed.
>> I had to fix it up with the below patch. This is mainly because chip->ecc.steps wasn't
>> yet initialized before calling nand_bch_init().
>>
>> After the below patch it worked fine with bch4 (hw & sw), bch8 (hw & sw) and ham1.
>> I couldn't yet verify bch16 though.
> 

I just verified that bch16 works as well.

> Thanks for the fix, but I'd prefer fixing the bug for all soft BCH
> users.
> 
> Could you try this patch?

I tried your patch and it worked fine.
You will still need the below change to omap2.c

--
cheers,
-roger

diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index 0abfba6..33c8fde 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -1715,7 +1715,7 @@ static int omap_sw_ooblayout_free(struct mtd_info *mtd, int section,
 	struct nand_chip *chip = mtd_to_nand(mtd);
 	int off = BADBLOCK_MARKER_LENGTH;
 
-	if (section)
+	if (section >= chip->ecc.steps)
 		return -ERANGE;
 
 	/*
-- 
2.5.0

Re: [PATCH v5 39/50] mtd: nand: omap2: switch to mtd_ooblayout_ops

[Roger Quadros]

On 19/04/16 14:22, Boris Brezillon wrote:
> Hi Roger,
> 
> On Tue, 19 Apr 2016 13:28:50 +0300
> Roger Quadros <rogerq@ti.com> wrote:
> 
>>> @@ -1921,6 +1927,9 @@ static int omap_nand_probe(struct platform_device *pdev)
>>>  		nand_chip->ecc.correct          = omap_correct_data;
>>>  		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
>>>  		oobbytes_per_step		= nand_chip->ecc.bytes;
>>> +
>>> +		if (nand_chip->options & NAND_BUSWIDTH_16)
>>> +			min_oobbytes		= 1;
>>
>> Shouldn't this have been
>> 		if (!(nand_chip->options & NAND_BUSWIDTH_16)
>> 			min_oobbytes		= 1;
>> ?
> 
> Yep.
> 
>>
>>>  		break;
>>>  
>>>  	case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
>>> @@ -2038,10 +2047,8 @@ static int omap_nand_probe(struct platform_device *pdev)
>>>  	}
>>>  
>>>  	/* check if NAND device's OOB is enough to store ECC signatures */
>>> -	min_oobbytes = (oobbytes_per_step *
>>> -			(mtd->writesize / nand_chip->ecc.size)) +
>>> -		       (nand_chip->options & NAND_BUSWIDTH_16 ?
>>> -			BADBLOCK_MARKER_LENGTH : 1);
>>> +	min_oobbytes += (oobbytes_per_step *
>>> +			 (mtd->writesize / nand_chip->ecc.size));
>>>  	if (mtd->oobsize < min_oobbytes) {
>>>  		dev_err(&info->pdev->dev,
>>>  			"not enough OOB bytes required = %d, available=%d\n",
>>>
>>
>> After the above changes BCH with HW ECC worked fine but BCH with SW ECC still failed.
>> I had to fix it up with the below patch. This is mainly because chip->ecc.steps wasn't
>> yet initialized before calling nand_bch_init().
>>
>> After the below patch it worked fine with bch4 (hw & sw), bch8 (hw & sw) and ham1.
>> I couldn't yet verify bch16 though.
> 

I just verified that bch16 works as well.

> Thanks for the fix, but I'd prefer fixing the bug for all soft BCH
> users.
> 
> Could you try this patch?

I tried your patch and it worked fine.
You will still need the below change to omap2.c

--
cheers,
-roger

diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index 0abfba6..33c8fde 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -1715,7 +1715,7 @@ static int omap_sw_ooblayout_free(struct mtd_info *mtd, int section,
 	struct nand_chip *chip = mtd_to_nand(mtd);
 	int off = BADBLOCK_MARKER_LENGTH;
 
-	if (section)
+	if (section >= chip->ecc.steps)
 		return -ERANGE;
 
 	/*
-- 
2.5.0

[PATCH v5 39/50] mtd: nand: omap2: switch to mtd_ooblayout_ops

[Roger Quadros]

On 19/04/16 14:22, Boris Brezillon wrote:
> Hi Roger,
> 
> On Tue, 19 Apr 2016 13:28:50 +0300
> Roger Quadros <rogerq@ti.com> wrote:
> 
>>> @@ -1921,6 +1927,9 @@ static int omap_nand_probe(struct platform_device *pdev)
>>>  		nand_chip->ecc.correct          = omap_correct_data;
>>>  		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
>>>  		oobbytes_per_step		= nand_chip->ecc.bytes;
>>> +
>>> +		if (nand_chip->options & NAND_BUSWIDTH_16)
>>> +			min_oobbytes		= 1;
>>
>> Shouldn't this have been
>> 		if (!(nand_chip->options & NAND_BUSWIDTH_16)
>> 			min_oobbytes		= 1;
>> ?
> 
> Yep.
> 
>>
>>>  		break;
>>>  
>>>  	case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
>>> @@ -2038,10 +2047,8 @@ static int omap_nand_probe(struct platform_device *pdev)
>>>  	}
>>>  
>>>  	/* check if NAND device's OOB is enough to store ECC signatures */
>>> -	min_oobbytes = (oobbytes_per_step *
>>> -			(mtd->writesize / nand_chip->ecc.size)) +
>>> -		       (nand_chip->options & NAND_BUSWIDTH_16 ?
>>> -			BADBLOCK_MARKER_LENGTH : 1);
>>> +	min_oobbytes += (oobbytes_per_step *
>>> +			 (mtd->writesize / nand_chip->ecc.size));
>>>  	if (mtd->oobsize < min_oobbytes) {
>>>  		dev_err(&info->pdev->dev,
>>>  			"not enough OOB bytes required = %d, available=%d\n",
>>>
>>
>> After the above changes BCH with HW ECC worked fine but BCH with SW ECC still failed.
>> I had to fix it up with the below patch. This is mainly because chip->ecc.steps wasn't
>> yet initialized before calling nand_bch_init().
>>
>> After the below patch it worked fine with bch4 (hw & sw), bch8 (hw & sw) and ham1.
>> I couldn't yet verify bch16 though.
> 

I just verified that bch16 works as well.

> Thanks for the fix, but I'd prefer fixing the bug for all soft BCH
> users.
> 
> Could you try this patch?

I tried your patch and it worked fine.
You will still need the below change to omap2.c

--
cheers,
-roger

diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index 0abfba6..33c8fde 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -1715,7 +1715,7 @@ static int omap_sw_ooblayout_free(struct mtd_info *mtd, int section,
 	struct nand_chip *chip = mtd_to_nand(mtd);
 	int off = BADBLOCK_MARKER_LENGTH;
 
-	if (section)
+	if (section >= chip->ecc.steps)
 		return -ERANGE;
 
 	/*
-- 
2.5.0

Re: [PATCH v5 39/50] mtd: nand: omap2: switch to mtd_ooblayout_ops

[Boris Brezillon]

On Tue, 19 Apr 2016 15:30:39 +0300
Roger Quadros <rogerq@ti.com> wrote:

> On 19/04/16 14:22, Boris Brezillon wrote:
> > Hi Roger,
> > 
> > On Tue, 19 Apr 2016 13:28:50 +0300
> > Roger Quadros <rogerq@ti.com> wrote:
> > 
> >>> @@ -1921,6 +1927,9 @@ static int omap_nand_probe(struct platform_device *pdev)
> >>>  		nand_chip->ecc.correct          = omap_correct_data;
> >>>  		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
> >>>  		oobbytes_per_step		= nand_chip->ecc.bytes;
> >>> +
> >>> +		if (nand_chip->options & NAND_BUSWIDTH_16)
> >>> +			min_oobbytes		= 1;
> >>
> >> Shouldn't this have been
> >> 		if (!(nand_chip->options & NAND_BUSWIDTH_16)
> >> 			min_oobbytes		= 1;
> >> ?
> > 
> > Yep.
> > 
> >>
> >>>  		break;
> >>>  
> >>>  	case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
> >>> @@ -2038,10 +2047,8 @@ static int omap_nand_probe(struct platform_device *pdev)
> >>>  	}
> >>>  
> >>>  	/* check if NAND device's OOB is enough to store ECC signatures */
> >>> -	min_oobbytes = (oobbytes_per_step *
> >>> -			(mtd->writesize / nand_chip->ecc.size)) +
> >>> -		       (nand_chip->options & NAND_BUSWIDTH_16 ?
> >>> -			BADBLOCK_MARKER_LENGTH : 1);
> >>> +	min_oobbytes += (oobbytes_per_step *
> >>> +			 (mtd->writesize / nand_chip->ecc.size));
> >>>  	if (mtd->oobsize < min_oobbytes) {
> >>>  		dev_err(&info->pdev->dev,
> >>>  			"not enough OOB bytes required = %d, available=%d\n",
> >>>
> >>
> >> After the above changes BCH with HW ECC worked fine but BCH with SW ECC still failed.
> >> I had to fix it up with the below patch. This is mainly because chip->ecc.steps wasn't
> >> yet initialized before calling nand_bch_init().
> >>
> >> After the below patch it worked fine with bch4 (hw & sw), bch8 (hw & sw) and ham1.
> >> I couldn't yet verify bch16 though.
> > 
> 
> I just verified that bch16 works as well.
> 
> > Thanks for the fix, but I'd prefer fixing the bug for all soft BCH
> > users.
> > 
> > Could you try this patch?
> 
> I tried your patch and it worked fine.

Thanks, I'll provide a reworked nand/next branch soon.
BTW, is there anything to fix in my merge commit (the commit merging
your GPMC/OMAP changes in nand/next)?

> You will still need the below change to omap2.c
> 
> --
> cheers,
> -roger
> 
> diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
> index 0abfba6..33c8fde 100644
> --- a/drivers/mtd/nand/omap2.c
> +++ b/drivers/mtd/nand/omap2.c
> @@ -1715,7 +1715,7 @@ static int omap_sw_ooblayout_free(struct mtd_info *mtd, int section,
>  	struct nand_chip *chip = mtd_to_nand(mtd);
>  	int off = BADBLOCK_MARKER_LENGTH;
>  
> -	if (section)
> +	if (section >= chip->ecc.steps)
>  		return -ERANGE;

Sorry but I don't get why we need that one. Don't we have a single
oobfree section starting at the end of the ECC sections?


-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

Re: [PATCH v5 39/50] mtd: nand: omap2: switch to mtd_ooblayout_ops

[Boris Brezillon]

On Tue, 19 Apr 2016 15:30:39 +0300
Roger Quadros <rogerq-l0cyMroinI0@public.gmane.org> wrote:

> On 19/04/16 14:22, Boris Brezillon wrote:
> > Hi Roger,
> > 
> > On Tue, 19 Apr 2016 13:28:50 +0300
> > Roger Quadros <rogerq-l0cyMroinI0@public.gmane.org> wrote:
> > 
> >>> @@ -1921,6 +1927,9 @@ static int omap_nand_probe(struct platform_device *pdev)
> >>>  		nand_chip->ecc.correct          = omap_correct_data;
> >>>  		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
> >>>  		oobbytes_per_step		= nand_chip->ecc.bytes;
> >>> +
> >>> +		if (nand_chip->options & NAND_BUSWIDTH_16)
> >>> +			min_oobbytes		= 1;
> >>
> >> Shouldn't this have been
> >> 		if (!(nand_chip->options & NAND_BUSWIDTH_16)
> >> 			min_oobbytes		= 1;
> >> ?
> > 
> > Yep.
> > 
> >>
> >>>  		break;
> >>>  
> >>>  	case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
> >>> @@ -2038,10 +2047,8 @@ static int omap_nand_probe(struct platform_device *pdev)
> >>>  	}
> >>>  
> >>>  	/* check if NAND device's OOB is enough to store ECC signatures */
> >>> -	min_oobbytes = (oobbytes_per_step *
> >>> -			(mtd->writesize / nand_chip->ecc.size)) +
> >>> -		       (nand_chip->options & NAND_BUSWIDTH_16 ?
> >>> -			BADBLOCK_MARKER_LENGTH : 1);
> >>> +	min_oobbytes += (oobbytes_per_step *
> >>> +			 (mtd->writesize / nand_chip->ecc.size));
> >>>  	if (mtd->oobsize < min_oobbytes) {
> >>>  		dev_err(&info->pdev->dev,
> >>>  			"not enough OOB bytes required = %d, available=%d\n",
> >>>
> >>
> >> After the above changes BCH with HW ECC worked fine but BCH with SW ECC still failed.
> >> I had to fix it up with the below patch. This is mainly because chip->ecc.steps wasn't
> >> yet initialized before calling nand_bch_init().
> >>
> >> After the below patch it worked fine with bch4 (hw & sw), bch8 (hw & sw) and ham1.
> >> I couldn't yet verify bch16 though.
> > 
> 
> I just verified that bch16 works as well.
> 
> > Thanks for the fix, but I'd prefer fixing the bug for all soft BCH
> > users.
> > 
> > Could you try this patch?
> 
> I tried your patch and it worked fine.

Thanks, I'll provide a reworked nand/next branch soon.
BTW, is there anything to fix in my merge commit (the commit merging
your GPMC/OMAP changes in nand/next)?

> You will still need the below change to omap2.c
> 
> --
> cheers,
> -roger
> 
> diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
> index 0abfba6..33c8fde 100644
> --- a/drivers/mtd/nand/omap2.c
> +++ b/drivers/mtd/nand/omap2.c
> @@ -1715,7 +1715,7 @@ static int omap_sw_ooblayout_free(struct mtd_info *mtd, int section,
>  	struct nand_chip *chip = mtd_to_nand(mtd);
>  	int off = BADBLOCK_MARKER_LENGTH;
>  
> -	if (section)
> +	if (section >= chip->ecc.steps)
>  		return -ERANGE;

Sorry but I don't get why we need that one. Don't we have a single
oobfree section starting at the end of the ECC sections?


-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

Re: [PATCH v5 39/50] mtd: nand: omap2: switch to mtd_ooblayout_ops

[Boris Brezillon]

On Tue, 19 Apr 2016 15:30:39 +0300
Roger Quadros <rogerq@ti.com> wrote:

> On 19/04/16 14:22, Boris Brezillon wrote:
> > Hi Roger,
> > 
> > On Tue, 19 Apr 2016 13:28:50 +0300
> > Roger Quadros <rogerq@ti.com> wrote:
> > 
> >>> @@ -1921,6 +1927,9 @@ static int omap_nand_probe(struct platform_device *pdev)
> >>>  		nand_chip->ecc.correct          = omap_correct_data;
> >>>  		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
> >>>  		oobbytes_per_step		= nand_chip->ecc.bytes;
> >>> +
> >>> +		if (nand_chip->options & NAND_BUSWIDTH_16)
> >>> +			min_oobbytes		= 1;
> >>
> >> Shouldn't this have been
> >> 		if (!(nand_chip->options & NAND_BUSWIDTH_16)
> >> 			min_oobbytes		= 1;
> >> ?
> > 
> > Yep.
> > 
> >>
> >>>  		break;
> >>>  
> >>>  	case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
> >>> @@ -2038,10 +2047,8 @@ static int omap_nand_probe(struct platform_device *pdev)
> >>>  	}
> >>>  
> >>>  	/* check if NAND device's OOB is enough to store ECC signatures */
> >>> -	min_oobbytes = (oobbytes_per_step *
> >>> -			(mtd->writesize / nand_chip->ecc.size)) +
> >>> -		       (nand_chip->options & NAND_BUSWIDTH_16 ?
> >>> -			BADBLOCK_MARKER_LENGTH : 1);
> >>> +	min_oobbytes += (oobbytes_per_step *
> >>> +			 (mtd->writesize / nand_chip->ecc.size));
> >>>  	if (mtd->oobsize < min_oobbytes) {
> >>>  		dev_err(&info->pdev->dev,
> >>>  			"not enough OOB bytes required = %d, available=%d\n",
> >>>
> >>
> >> After the above changes BCH with HW ECC worked fine but BCH with SW ECC still failed.
> >> I had to fix it up with the below patch. This is mainly because chip->ecc.steps wasn't
> >> yet initialized before calling nand_bch_init().
> >>
> >> After the below patch it worked fine with bch4 (hw & sw), bch8 (hw & sw) and ham1.
> >> I couldn't yet verify bch16 though.
> > 
> 
> I just verified that bch16 works as well.
> 
> > Thanks for the fix, but I'd prefer fixing the bug for all soft BCH
> > users.
> > 
> > Could you try this patch?
> 
> I tried your patch and it worked fine.

Thanks, I'll provide a reworked nand/next branch soon.
BTW, is there anything to fix in my merge commit (the commit merging
your GPMC/OMAP changes in nand/next)?

> You will still need the below change to omap2.c
> 
> --
> cheers,
> -roger
> 
> diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
> index 0abfba6..33c8fde 100644
> --- a/drivers/mtd/nand/omap2.c
> +++ b/drivers/mtd/nand/omap2.c
> @@ -1715,7 +1715,7 @@ static int omap_sw_ooblayout_free(struct mtd_info *mtd, int section,
>  	struct nand_chip *chip = mtd_to_nand(mtd);
>  	int off = BADBLOCK_MARKER_LENGTH;
>  
> -	if (section)
> +	if (section >= chip->ecc.steps)
>  		return -ERANGE;

Sorry but I don't get why we need that one. Don't we have a single
oobfree section starting at the end of the ECC sections?


-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

[PATCH v5 39/50] mtd: nand: omap2: switch to mtd_ooblayout_ops

[Boris Brezillon]

On Tue, 19 Apr 2016 15:30:39 +0300
Roger Quadros <rogerq@ti.com> wrote:

> On 19/04/16 14:22, Boris Brezillon wrote:
> > Hi Roger,
> > 
> > On Tue, 19 Apr 2016 13:28:50 +0300
> > Roger Quadros <rogerq@ti.com> wrote:
> > 
> >>> @@ -1921,6 +1927,9 @@ static int omap_nand_probe(struct platform_device *pdev)
> >>>  		nand_chip->ecc.correct          = omap_correct_data;
> >>>  		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
> >>>  		oobbytes_per_step		= nand_chip->ecc.bytes;
> >>> +
> >>> +		if (nand_chip->options & NAND_BUSWIDTH_16)
> >>> +			min_oobbytes		= 1;
> >>
> >> Shouldn't this have been
> >> 		if (!(nand_chip->options & NAND_BUSWIDTH_16)
> >> 			min_oobbytes		= 1;
> >> ?
> > 
> > Yep.
> > 
> >>
> >>>  		break;
> >>>  
> >>>  	case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
> >>> @@ -2038,10 +2047,8 @@ static int omap_nand_probe(struct platform_device *pdev)
> >>>  	}
> >>>  
> >>>  	/* check if NAND device's OOB is enough to store ECC signatures */
> >>> -	min_oobbytes = (oobbytes_per_step *
> >>> -			(mtd->writesize / nand_chip->ecc.size)) +
> >>> -		       (nand_chip->options & NAND_BUSWIDTH_16 ?
> >>> -			BADBLOCK_MARKER_LENGTH : 1);
> >>> +	min_oobbytes += (oobbytes_per_step *
> >>> +			 (mtd->writesize / nand_chip->ecc.size));
> >>>  	if (mtd->oobsize < min_oobbytes) {
> >>>  		dev_err(&info->pdev->dev,
> >>>  			"not enough OOB bytes required = %d, available=%d\n",
> >>>
> >>
> >> After the above changes BCH with HW ECC worked fine but BCH with SW ECC still failed.
> >> I had to fix it up with the below patch. This is mainly because chip->ecc.steps wasn't
> >> yet initialized before calling nand_bch_init().
> >>
> >> After the below patch it worked fine with bch4 (hw & sw), bch8 (hw & sw) and ham1.
> >> I couldn't yet verify bch16 though.
> > 
> 
> I just verified that bch16 works as well.
> 
> > Thanks for the fix, but I'd prefer fixing the bug for all soft BCH
> > users.
> > 
> > Could you try this patch?
> 
> I tried your patch and it worked fine.

Thanks, I'll provide a reworked nand/next branch soon.
BTW, is there anything to fix in my merge commit (the commit merging
your GPMC/OMAP changes in nand/next)?

> You will still need the below change to omap2.c
> 
> --
> cheers,
> -roger
> 
> diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
> index 0abfba6..33c8fde 100644
> --- a/drivers/mtd/nand/omap2.c
> +++ b/drivers/mtd/nand/omap2.c
> @@ -1715,7 +1715,7 @@ static int omap_sw_ooblayout_free(struct mtd_info *mtd, int section,
>  	struct nand_chip *chip = mtd_to_nand(mtd);
>  	int off = BADBLOCK_MARKER_LENGTH;
>  
> -	if (section)
> +	if (section >= chip->ecc.steps)
>  		return -ERANGE;

Sorry but I don't get why we need that one. Don't we have a single
oobfree section starting at the end of the ECC sections?


-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

Re: [PATCH v5 39/50] mtd: nand: omap2: switch to mtd_ooblayout_ops

[Roger Quadros]

On 19/04/16 15:41, Boris Brezillon wrote:
> On Tue, 19 Apr 2016 15:30:39 +0300
> Roger Quadros <rogerq@ti.com> wrote:
> 
>> On 19/04/16 14:22, Boris Brezillon wrote:
>>> Hi Roger,
>>>
>>> On Tue, 19 Apr 2016 13:28:50 +0300
>>> Roger Quadros <rogerq@ti.com> wrote:
>>>
>>>>> @@ -1921,6 +1927,9 @@ static int omap_nand_probe(struct platform_device *pdev)
>>>>>  		nand_chip->ecc.correct          = omap_correct_data;
>>>>>  		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
>>>>>  		oobbytes_per_step		= nand_chip->ecc.bytes;
>>>>> +
>>>>> +		if (nand_chip->options & NAND_BUSWIDTH_16)
>>>>> +			min_oobbytes		= 1;
>>>>
>>>> Shouldn't this have been
>>>> 		if (!(nand_chip->options & NAND_BUSWIDTH_16)
>>>> 			min_oobbytes		= 1;
>>>> ?
>>>
>>> Yep.
>>>
>>>>
>>>>>  		break;
>>>>>  
>>>>>  	case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
>>>>> @@ -2038,10 +2047,8 @@ static int omap_nand_probe(struct platform_device *pdev)
>>>>>  	}
>>>>>  
>>>>>  	/* check if NAND device's OOB is enough to store ECC signatures */
>>>>> -	min_oobbytes = (oobbytes_per_step *
>>>>> -			(mtd->writesize / nand_chip->ecc.size)) +
>>>>> -		       (nand_chip->options & NAND_BUSWIDTH_16 ?
>>>>> -			BADBLOCK_MARKER_LENGTH : 1);
>>>>> +	min_oobbytes += (oobbytes_per_step *
>>>>> +			 (mtd->writesize / nand_chip->ecc.size));
>>>>>  	if (mtd->oobsize < min_oobbytes) {
>>>>>  		dev_err(&info->pdev->dev,
>>>>>  			"not enough OOB bytes required = %d, available=%d\n",
>>>>>
>>>>
>>>> After the above changes BCH with HW ECC worked fine but BCH with SW ECC still failed.
>>>> I had to fix it up with the below patch. This is mainly because chip->ecc.steps wasn't
>>>> yet initialized before calling nand_bch_init().
>>>>
>>>> After the below patch it worked fine with bch4 (hw & sw), bch8 (hw & sw) and ham1.
>>>> I couldn't yet verify bch16 though.
>>>
>>
>> I just verified that bch16 works as well.
>>
>>> Thanks for the fix, but I'd prefer fixing the bug for all soft BCH
>>> users.
>>>
>>> Could you try this patch?
>>
>> I tried your patch and it worked fine.
> 
> Thanks, I'll provide a reworked nand/next branch soon.
> BTW, is there anything to fix in my merge commit (the commit merging
> your GPMC/OMAP changes in nand/next)?
> 

I just replied in the other thread that the conflict resolution is fine.

>> You will still need the below change to omap2.c
>>
>> --
>> cheers,
>> -roger
>>
>> diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
>> index 0abfba6..33c8fde 100644
>> --- a/drivers/mtd/nand/omap2.c
>> +++ b/drivers/mtd/nand/omap2.c
>> @@ -1715,7 +1715,7 @@ static int omap_sw_ooblayout_free(struct mtd_info *mtd, int section,
>>  	struct nand_chip *chip = mtd_to_nand(mtd);
>>  	int off = BADBLOCK_MARKER_LENGTH;
>>  
>> -	if (section)
>> +	if (section >= chip->ecc.steps)
>>  		return -ERANGE;
> 
> Sorry but I don't get why we need that one. Don't we have a single
> oobfree section starting at the end of the ECC sections?
> 
> 
You are right. Nothing needs to be changed there then. Thanks :)

cheers,
-roger

Re: [PATCH v5 39/50] mtd: nand: omap2: switch to mtd_ooblayout_ops

[Roger Quadros]

On 19/04/16 15:41, Boris Brezillon wrote:
> On Tue, 19 Apr 2016 15:30:39 +0300
> Roger Quadros <rogerq-l0cyMroinI0@public.gmane.org> wrote:
> 
>> On 19/04/16 14:22, Boris Brezillon wrote:
>>> Hi Roger,
>>>
>>> On Tue, 19 Apr 2016 13:28:50 +0300
>>> Roger Quadros <rogerq-l0cyMroinI0@public.gmane.org> wrote:
>>>
>>>>> @@ -1921,6 +1927,9 @@ static int omap_nand_probe(struct platform_device *pdev)
>>>>>  		nand_chip->ecc.correct          = omap_correct_data;
>>>>>  		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
>>>>>  		oobbytes_per_step		= nand_chip->ecc.bytes;
>>>>> +
>>>>> +		if (nand_chip->options & NAND_BUSWIDTH_16)
>>>>> +			min_oobbytes		= 1;
>>>>
>>>> Shouldn't this have been
>>>> 		if (!(nand_chip->options & NAND_BUSWIDTH_16)
>>>> 			min_oobbytes		= 1;
>>>> ?
>>>
>>> Yep.
>>>
>>>>
>>>>>  		break;
>>>>>  
>>>>>  	case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
>>>>> @@ -2038,10 +2047,8 @@ static int omap_nand_probe(struct platform_device *pdev)
>>>>>  	}
>>>>>  
>>>>>  	/* check if NAND device's OOB is enough to store ECC signatures */
>>>>> -	min_oobbytes = (oobbytes_per_step *
>>>>> -			(mtd->writesize / nand_chip->ecc.size)) +
>>>>> -		       (nand_chip->options & NAND_BUSWIDTH_16 ?
>>>>> -			BADBLOCK_MARKER_LENGTH : 1);
>>>>> +	min_oobbytes += (oobbytes_per_step *
>>>>> +			 (mtd->writesize / nand_chip->ecc.size));
>>>>>  	if (mtd->oobsize < min_oobbytes) {
>>>>>  		dev_err(&info->pdev->dev,
>>>>>  			"not enough OOB bytes required = %d, available=%d\n",
>>>>>
>>>>
>>>> After the above changes BCH with HW ECC worked fine but BCH with SW ECC still failed.
>>>> I had to fix it up with the below patch. This is mainly because chip->ecc.steps wasn't
>>>> yet initialized before calling nand_bch_init().
>>>>
>>>> After the below patch it worked fine with bch4 (hw & sw), bch8 (hw & sw) and ham1.
>>>> I couldn't yet verify bch16 though.
>>>
>>
>> I just verified that bch16 works as well.
>>
>>> Thanks for the fix, but I'd prefer fixing the bug for all soft BCH
>>> users.
>>>
>>> Could you try this patch?
>>
>> I tried your patch and it worked fine.
> 
> Thanks, I'll provide a reworked nand/next branch soon.
> BTW, is there anything to fix in my merge commit (the commit merging
> your GPMC/OMAP changes in nand/next)?
> 

I just replied in the other thread that the conflict resolution is fine.

>> You will still need the below change to omap2.c
>>
>> --
>> cheers,
>> -roger
>>
>> diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
>> index 0abfba6..33c8fde 100644
>> --- a/drivers/mtd/nand/omap2.c
>> +++ b/drivers/mtd/nand/omap2.c
>> @@ -1715,7 +1715,7 @@ static int omap_sw_ooblayout_free(struct mtd_info *mtd, int section,
>>  	struct nand_chip *chip = mtd_to_nand(mtd);
>>  	int off = BADBLOCK_MARKER_LENGTH;
>>  
>> -	if (section)
>> +	if (section >= chip->ecc.steps)
>>  		return -ERANGE;
> 
> Sorry but I don't get why we need that one. Don't we have a single
> oobfree section starting at the end of the ECC sections?
> 
> 
You are right. Nothing needs to be changed there then. Thanks :)

cheers,
-roger

Re: [PATCH v5 39/50] mtd: nand: omap2: switch to mtd_ooblayout_ops

[Roger Quadros]

On 19/04/16 15:41, Boris Brezillon wrote:
> On Tue, 19 Apr 2016 15:30:39 +0300
> Roger Quadros <rogerq@ti.com> wrote:
> 
>> On 19/04/16 14:22, Boris Brezillon wrote:
>>> Hi Roger,
>>>
>>> On Tue, 19 Apr 2016 13:28:50 +0300
>>> Roger Quadros <rogerq@ti.com> wrote:
>>>
>>>>> @@ -1921,6 +1927,9 @@ static int omap_nand_probe(struct platform_device *pdev)
>>>>>  		nand_chip->ecc.correct          = omap_correct_data;
>>>>>  		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
>>>>>  		oobbytes_per_step		= nand_chip->ecc.bytes;
>>>>> +
>>>>> +		if (nand_chip->options & NAND_BUSWIDTH_16)
>>>>> +			min_oobbytes		= 1;
>>>>
>>>> Shouldn't this have been
>>>> 		if (!(nand_chip->options & NAND_BUSWIDTH_16)
>>>> 			min_oobbytes		= 1;
>>>> ?
>>>
>>> Yep.
>>>
>>>>
>>>>>  		break;
>>>>>  
>>>>>  	case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
>>>>> @@ -2038,10 +2047,8 @@ static int omap_nand_probe(struct platform_device *pdev)
>>>>>  	}
>>>>>  
>>>>>  	/* check if NAND device's OOB is enough to store ECC signatures */
>>>>> -	min_oobbytes = (oobbytes_per_step *
>>>>> -			(mtd->writesize / nand_chip->ecc.size)) +
>>>>> -		       (nand_chip->options & NAND_BUSWIDTH_16 ?
>>>>> -			BADBLOCK_MARKER_LENGTH : 1);
>>>>> +	min_oobbytes += (oobbytes_per_step *
>>>>> +			 (mtd->writesize / nand_chip->ecc.size));
>>>>>  	if (mtd->oobsize < min_oobbytes) {
>>>>>  		dev_err(&info->pdev->dev,
>>>>>  			"not enough OOB bytes required = %d, available=%d\n",
>>>>>
>>>>
>>>> After the above changes BCH with HW ECC worked fine but BCH with SW ECC still failed.
>>>> I had to fix it up with the below patch. This is mainly because chip->ecc.steps wasn't
>>>> yet initialized before calling nand_bch_init().
>>>>
>>>> After the below patch it worked fine with bch4 (hw & sw), bch8 (hw & sw) and ham1.
>>>> I couldn't yet verify bch16 though.
>>>
>>
>> I just verified that bch16 works as well.
>>
>>> Thanks for the fix, but I'd prefer fixing the bug for all soft BCH
>>> users.
>>>
>>> Could you try this patch?
>>
>> I tried your patch and it worked fine.
> 
> Thanks, I'll provide a reworked nand/next branch soon.
> BTW, is there anything to fix in my merge commit (the commit merging
> your GPMC/OMAP changes in nand/next)?
> 

I just replied in the other thread that the conflict resolution is fine.

>> You will still need the below change to omap2.c
>>
>> --
>> cheers,
>> -roger
>>
>> diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
>> index 0abfba6..33c8fde 100644
>> --- a/drivers/mtd/nand/omap2.c
>> +++ b/drivers/mtd/nand/omap2.c
>> @@ -1715,7 +1715,7 @@ static int omap_sw_ooblayout_free(struct mtd_info *mtd, int section,
>>  	struct nand_chip *chip = mtd_to_nand(mtd);
>>  	int off = BADBLOCK_MARKER_LENGTH;
>>  
>> -	if (section)
>> +	if (section >= chip->ecc.steps)
>>  		return -ERANGE;
> 
> Sorry but I don't get why we need that one. Don't we have a single
> oobfree section starting at the end of the ECC sections?
> 
> 
You are right. Nothing needs to be changed there then. Thanks :)

cheers,
-roger

[PATCH v5 39/50] mtd: nand: omap2: switch to mtd_ooblayout_ops

[Roger Quadros]

On 19/04/16 15:41, Boris Brezillon wrote:
> On Tue, 19 Apr 2016 15:30:39 +0300
> Roger Quadros <rogerq@ti.com> wrote:
> 
>> On 19/04/16 14:22, Boris Brezillon wrote:
>>> Hi Roger,
>>>
>>> On Tue, 19 Apr 2016 13:28:50 +0300
>>> Roger Quadros <rogerq@ti.com> wrote:
>>>
>>>>> @@ -1921,6 +1927,9 @@ static int omap_nand_probe(struct platform_device *pdev)
>>>>>  		nand_chip->ecc.correct          = omap_correct_data;
>>>>>  		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
>>>>>  		oobbytes_per_step		= nand_chip->ecc.bytes;
>>>>> +
>>>>> +		if (nand_chip->options & NAND_BUSWIDTH_16)
>>>>> +			min_oobbytes		= 1;
>>>>
>>>> Shouldn't this have been
>>>> 		if (!(nand_chip->options & NAND_BUSWIDTH_16)
>>>> 			min_oobbytes		= 1;
>>>> ?
>>>
>>> Yep.
>>>
>>>>
>>>>>  		break;
>>>>>  
>>>>>  	case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
>>>>> @@ -2038,10 +2047,8 @@ static int omap_nand_probe(struct platform_device *pdev)
>>>>>  	}
>>>>>  
>>>>>  	/* check if NAND device's OOB is enough to store ECC signatures */
>>>>> -	min_oobbytes = (oobbytes_per_step *
>>>>> -			(mtd->writesize / nand_chip->ecc.size)) +
>>>>> -		       (nand_chip->options & NAND_BUSWIDTH_16 ?
>>>>> -			BADBLOCK_MARKER_LENGTH : 1);
>>>>> +	min_oobbytes += (oobbytes_per_step *
>>>>> +			 (mtd->writesize / nand_chip->ecc.size));
>>>>>  	if (mtd->oobsize < min_oobbytes) {
>>>>>  		dev_err(&info->pdev->dev,
>>>>>  			"not enough OOB bytes required = %d, available=%d\n",
>>>>>
>>>>
>>>> After the above changes BCH with HW ECC worked fine but BCH with SW ECC still failed.
>>>> I had to fix it up with the below patch. This is mainly because chip->ecc.steps wasn't
>>>> yet initialized before calling nand_bch_init().
>>>>
>>>> After the below patch it worked fine with bch4 (hw & sw), bch8 (hw & sw) and ham1.
>>>> I couldn't yet verify bch16 though.
>>>
>>
>> I just verified that bch16 works as well.
>>
>>> Thanks for the fix, but I'd prefer fixing the bug for all soft BCH
>>> users.
>>>
>>> Could you try this patch?
>>
>> I tried your patch and it worked fine.
> 
> Thanks, I'll provide a reworked nand/next branch soon.
> BTW, is there anything to fix in my merge commit (the commit merging
> your GPMC/OMAP changes in nand/next)?
> 

I just replied in the other thread that the conflict resolution is fine.

>> You will still need the below change to omap2.c
>>
>> --
>> cheers,
>> -roger
>>
>> diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
>> index 0abfba6..33c8fde 100644
>> --- a/drivers/mtd/nand/omap2.c
>> +++ b/drivers/mtd/nand/omap2.c
>> @@ -1715,7 +1715,7 @@ static int omap_sw_ooblayout_free(struct mtd_info *mtd, int section,
>>  	struct nand_chip *chip = mtd_to_nand(mtd);
>>  	int off = BADBLOCK_MARKER_LENGTH;
>>  
>> -	if (section)
>> +	if (section >= chip->ecc.steps)
>>  		return -ERANGE;
> 
> Sorry but I don't get why we need that one. Don't we have a single
> oobfree section starting at the end of the ECC sections?
> 
> 
You are right. Nothing needs to be changed there then. Thanks :)

cheers,
-roger