[PATCH v3 0/9] mtd: spi-nor: parse SFDP tables to setup (Q)SPI memories

[PATCH v3 0/9] mtd: spi-nor: parse SFDP tables to setup (Q)SPI memories

[Cyrille Pitchen]

Hi all,

This series extends support of SPI protocols to new protocols such as
SPI x-2-2 and SPI x-4-4. Also spi_nor_scan() tries now to select the right
op codes, timing parameters (number of mode and dummy cycles) and erase
sector size by parsing the Serial Flash Discoverable Parameter (SFDP)
tables, when available, as defined in the JEDEC JESD216 specifications.

When SFDP tables are not available, legacy settings are still used for
backward compatibility (SPI and earlier QSPI memories).

Support of SPI memories >128Mbits is also improved by using the 4byte
address instruction set, when available. Using those dedicated op codes
is stateless as opposed to enter the 4byte address mode, hence a better
compatibility with some boot loaders which expect to use 3byte address
op codes.


This series was tested on a Atmel sama5d2 xplained board with the
atmel-qspi.c driver. Except for SST memories, the SPI bus clock was set
to 83MHz. The config MTD_SPI_NOR_USE_4K_SECTORS was selected.

For my tests, I used some shell scripts using mtd_debug and sha1sum to
check the data integrity.

e.g:
#!/bin/sh

mtd_debug erase /dev/mtd5 0 0x780000
mtd_debug write /dev/mtd5 0 7674703 sama5d4_doc11238.pdf
mtd_debug read /dev/mtd5 0 7674703 sama5d4_tmp.pdf

sha1sum sama5d4_doc11238.pdf sama5d4_tmp.pdf


Depending on the actual memory size, I may have used other partitions
(/dev/mtd4) and input file size (2880044 and 320044 bytes).


The series was tested with the following QSPI memories:

Spansion/Cypress:
- s25fl127s	OK
- s25fl512s	OK
- s25fl164k	OK

Micron:
- n25q128a	OK
- n25q512	OK
- n25q01g	OK

Macronix:
- mx25v1635f	OK
- mx25l3235f	OK
- mx25l3273f	OK
- mx25l6433f	OK
- mx25l6473f	OK
- mx25l12835f	OK
- mx25l12845g	OK
- mx25l12873g	OK
- mx25l25645g	OK
- mx25l25673g	OK
- mx25l51245g	OK
- mx66l1g45g	OK (1)

SST:
- sst26vf016b	OK (2)
- sst26vf032b	OK (2)
- sst26vf064b	OK (2)

(1): requires patch 8
(2): requires patch 9, the SPI bus clock frequency was decreased down to 55.3MHz


Best regards,

Cyrille

ChangeLog:

v2 -> v3
- tested with new samples: Micron n25q512, n25q01g and Macronix
  mx25v1635f, mx25l3235f, mx25l3273f.
- add "Reviewed-by: Jagan Teki <jagan@openedev.com>" on patch 1.
- add "Tested-by: Vignesh R <vigneshr@ti.com>" on patch 2.
- fix some checkpatch warnings.
- add call of spi_nor_wait_till_ready() in spansion_new_quad_enable() 
  and sr2_bit7_quad_enable(), as suggested by Joel Esponde on patch 6.
- test JESD216 rev A (minor 5) instead of rev B (minor 6) with the return
  code of spi_nor_parse_sfdp() from spi_nor_init_params() on patch 6.
  The seven additional DWORDs of the Basic Flash Parameter Table were
  introduced in rev A, not rev B, so the 15th DWORD was already available
  in rev A. The 15th DWORD provides us with the Quad Enable Requirements
  (QER) bits.
  Basic Flash Parameter Table size:
  + JESD216 :  9 DWORDS
  + JESD216A: 16 DWORDS
  + JESD216B: 16 DWORDS

v1 -> v2
- fix patch 3 to resolve compiler errors on hisi-sfc.c and cadence-quadspi.c
  drivers


Cyrille Pitchen (9):
  mtd: spi-nor: improve macronix_quad_enable()
  mtd: spi-nor: add an alternative method to support memory >16MiB
  mtd: spi-nor: add support of SPI protocols like SPI 1-2-2 and SPI
    1-4-4
  mtd: spi-nor: remove unused set_quad_mode() function
  mtd: m25p80: add support of dual and quad spi protocols to all
    commands
  mtd: spi-nor: parse Serial Flash Discoverable Parameters (SFDP) tables
  mtd: spi-nor: parse SFDP 4-byte Address Instruction Table
  mtd: spi-nor: add support to Macronix mx66l1g45g
  mtd: spi-nor: add support to SST sst26* QSPI memories

 drivers/mtd/devices/m25p80.c            |  204 ++++--
 drivers/mtd/devices/serial_flash_cmds.h |    7 -
 drivers/mtd/devices/st_spi_fsm.c        |   28 +-
 drivers/mtd/spi-nor/atmel-quadspi.c     |   83 ++-
 drivers/mtd/spi-nor/cadence-quadspi.c   |   18 +-
 drivers/mtd/spi-nor/fsl-quadspi.c       |    8 +-
 drivers/mtd/spi-nor/hisi-sfc.c          |   32 +-
 drivers/mtd/spi-nor/mtk-quadspi.c       |   16 +-
 drivers/mtd/spi-nor/nxp-spifi.c         |   21 +-
 drivers/mtd/spi-nor/spi-nor.c           | 1026 ++++++++++++++++++++++++++++---
 include/linux/mtd/spi-nor.h             |  165 ++++-
 11 files changed, 1372 insertions(+), 236 deletions(-)

-- 
2.7.4

[PATCH v3 1/9] mtd: spi-nor: improve macronix_quad_enable()

[Cyrille Pitchen]

The patch checks whether the Quad Enable bit is already set in the Status
Register. If so, the function exits immediately with a successful return
code. Otherwise, a message is now printed telling we're setting the
non-volatile bit.

Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>
---
 drivers/mtd/spi-nor/spi-nor.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index d0fc165d7d66..5c87b2d99507 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -1211,6 +1211,11 @@ static int macronix_quad_enable(struct spi_nor *nor)
 	val = read_sr(nor);
 	if (val < 0)
 		return val;
+	if (val & SR_QUAD_EN_MX)
+		return 0;
+
+	/* Update the Quad Enable bit. */
+	dev_info(nor->dev, "setting Macronix Quad Enable (non-volatile) bit\n");
 	write_enable(nor);
 
 	write_sr(nor, val | SR_QUAD_EN_MX);
-- 
2.7.4

[PATCH v3 2/9] mtd: spi-nor: add an alternative method to support memory >16MiB

[Cyrille Pitchen]

This patch provides an alternative mean to support memory above 16MiB
(128Mib) by replacing 3byte address op codes by their associated 4byte
address versions.

Using the dedicated 4byte address op codes doesn't change the internal
state of the SPI NOR memory as opposed to using other means such as
updating a Base Address Register (BAR) and sending command to enter/leave
the 4byte mode.

Hence when a CPU reset occurs, early bootloaders don't need to be aware
of BAR value or 4byte mode being enabled: they can still access the first
16MiB of the SPI NOR memory using the regular 3byte address op codes.

Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
Tested-by: Vignesh R <vigneshr@ti.com>
---
 drivers/mtd/devices/serial_flash_cmds.h |   7 ---
 drivers/mtd/devices/st_spi_fsm.c        |  28 ++++-----
 drivers/mtd/spi-nor/spi-nor.c           | 104 +++++++++++++++++++++++++-------
 include/linux/mtd/spi-nor.h             |  22 +++++--
 4 files changed, 113 insertions(+), 48 deletions(-)

diff --git a/drivers/mtd/devices/serial_flash_cmds.h b/drivers/mtd/devices/serial_flash_cmds.h
index f59a125295d0..8b81e15105dd 100644
--- a/drivers/mtd/devices/serial_flash_cmds.h
+++ b/drivers/mtd/devices/serial_flash_cmds.h
@@ -18,19 +18,12 @@
 #define SPINOR_OP_RDVCR		0x85
 
 /* JEDEC Standard - Serial Flash Discoverable Parmeters (SFDP) Commands */
-#define SPINOR_OP_READ_1_2_2	0xbb	/* DUAL I/O READ */
-#define SPINOR_OP_READ_1_4_4	0xeb	/* QUAD I/O READ */
-
 #define SPINOR_OP_WRITE		0x02	/* PAGE PROGRAM */
 #define SPINOR_OP_WRITE_1_1_2	0xa2	/* DUAL INPUT PROGRAM */
 #define SPINOR_OP_WRITE_1_2_2	0xd2	/* DUAL INPUT EXT PROGRAM */
 #define SPINOR_OP_WRITE_1_1_4	0x32	/* QUAD INPUT PROGRAM */
 #define SPINOR_OP_WRITE_1_4_4	0x12	/* QUAD INPUT EXT PROGRAM */
 
-/* READ commands with 32-bit addressing */
-#define SPINOR_OP_READ4_1_2_2	0xbc
-#define SPINOR_OP_READ4_1_4_4	0xec
-
 /* Configuration flags */
 #define FLASH_FLAG_SINGLE	0x000000ff
 #define FLASH_FLAG_READ_WRITE	0x00000001
diff --git a/drivers/mtd/devices/st_spi_fsm.c b/drivers/mtd/devices/st_spi_fsm.c
index 5454b4113589..804313a33f2b 100644
--- a/drivers/mtd/devices/st_spi_fsm.c
+++ b/drivers/mtd/devices/st_spi_fsm.c
@@ -507,13 +507,13 @@ static struct seq_rw_config n25q_read3_configs[] = {
  *	- 'FAST' variants configured for 8 dummy cycles (see note above.)
  */
 static struct seq_rw_config n25q_read4_configs[] = {
-	{FLASH_FLAG_READ_1_4_4, SPINOR_OP_READ4_1_4_4,	0, 4, 4, 0x00, 0, 8},
-	{FLASH_FLAG_READ_1_1_4, SPINOR_OP_READ4_1_1_4,	0, 1, 4, 0x00, 0, 8},
-	{FLASH_FLAG_READ_1_2_2, SPINOR_OP_READ4_1_2_2,	0, 2, 2, 0x00, 0, 8},
-	{FLASH_FLAG_READ_1_1_2, SPINOR_OP_READ4_1_1_2,	0, 1, 2, 0x00, 0, 8},
-	{FLASH_FLAG_READ_FAST,	SPINOR_OP_READ4_FAST,	0, 1, 1, 0x00, 0, 8},
-	{FLASH_FLAG_READ_WRITE, SPINOR_OP_READ4,	0, 1, 1, 0x00, 0, 0},
-	{0x00,			0,			0, 0, 0, 0x00, 0, 0},
+	{FLASH_FLAG_READ_1_4_4, SPINOR_OP_READ_1_4_4_4B, 0, 4, 4, 0x00, 0, 8},
+	{FLASH_FLAG_READ_1_1_4, SPINOR_OP_READ_1_1_4_4B, 0, 1, 4, 0x00, 0, 8},
+	{FLASH_FLAG_READ_1_2_2, SPINOR_OP_READ_1_2_2_4B, 0, 2, 2, 0x00, 0, 8},
+	{FLASH_FLAG_READ_1_1_2, SPINOR_OP_READ_1_1_2_4B, 0, 1, 2, 0x00, 0, 8},
+	{FLASH_FLAG_READ_FAST,	SPINOR_OP_READ_FAST_4B,  0, 1, 1, 0x00, 0, 8},
+	{FLASH_FLAG_READ_WRITE, SPINOR_OP_READ_4B,       0, 1, 1, 0x00, 0, 0},
+	{0x00,			0,                       0, 0, 0, 0x00, 0, 0},
 };
 
 /*
@@ -553,13 +553,13 @@ static int stfsm_mx25_en_32bit_addr_seq(struct stfsm_seq *seq)
  * entering a state that is incompatible with the SPIBoot Controller.
  */
 static struct seq_rw_config stfsm_s25fl_read4_configs[] = {
-	{FLASH_FLAG_READ_1_4_4,  SPINOR_OP_READ4_1_4_4,  0, 4, 4, 0x00, 2, 4},
-	{FLASH_FLAG_READ_1_1_4,  SPINOR_OP_READ4_1_1_4,  0, 1, 4, 0x00, 0, 8},
-	{FLASH_FLAG_READ_1_2_2,  SPINOR_OP_READ4_1_2_2,  0, 2, 2, 0x00, 4, 0},
-	{FLASH_FLAG_READ_1_1_2,  SPINOR_OP_READ4_1_1_2,  0, 1, 2, 0x00, 0, 8},
-	{FLASH_FLAG_READ_FAST,   SPINOR_OP_READ4_FAST,   0, 1, 1, 0x00, 0, 8},
-	{FLASH_FLAG_READ_WRITE,  SPINOR_OP_READ4,        0, 1, 1, 0x00, 0, 0},
-	{0x00,                   0,                      0, 0, 0, 0x00, 0, 0},
+	{FLASH_FLAG_READ_1_4_4,  SPINOR_OP_READ_1_4_4_4B,  0, 4, 4, 0x00, 2, 4},
+	{FLASH_FLAG_READ_1_1_4,  SPINOR_OP_READ_1_1_4_4B,  0, 1, 4, 0x00, 0, 8},
+	{FLASH_FLAG_READ_1_2_2,  SPINOR_OP_READ_1_2_2_4B,  0, 2, 2, 0x00, 4, 0},
+	{FLASH_FLAG_READ_1_1_2,  SPINOR_OP_READ_1_1_2_4B,  0, 1, 2, 0x00, 0, 8},
+	{FLASH_FLAG_READ_FAST,   SPINOR_OP_READ_FAST_4B,   0, 1, 1, 0x00, 0, 8},
+	{FLASH_FLAG_READ_WRITE,  SPINOR_OP_READ_4B,        0, 1, 1, 0x00, 0, 0},
+	{0x00,                   0,                        0, 0, 0, 0x00, 0, 0},
 };
 
 static struct seq_rw_config stfsm_s25fl_write4_configs[] = {
diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index 5c87b2d99507..423448c1c7a8 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -75,6 +75,10 @@ struct flash_info {
 					 * bit. Must be used with
 					 * SPI_NOR_HAS_LOCK.
 					 */
+#define SPI_NOR_4B_OPCODES	BIT(10)	/*
+					 * Use dedicated 4byte address op codes
+					 * to support memory size above 128Mib.
+					 */
 };
 
 #define JEDEC_MFR(info)	((info)->id[0])
@@ -188,6 +192,81 @@ static inline struct spi_nor *mtd_to_spi_nor(struct mtd_info *mtd)
 	return mtd->priv;
 }
 
+
+struct spi_nor_address_entry {
+	u8	src_opcode;
+	u8	dst_opcode;
+};
+
+static u8 spi_nor_convert_opcode(u8 opcode,
+				 const struct spi_nor_address_entry *entries,
+				 size_t num_entries)
+{
+	int min, max;
+
+	min = 0;
+	max = num_entries - 1;
+	while (min <= max) {
+		int mid = (min + max) >> 1;
+		const struct spi_nor_address_entry *entry = &entries[mid];
+
+		if (opcode == entry->src_opcode)
+			return entry->dst_opcode;
+
+		if (opcode < entry->src_opcode)
+			max = mid - 1;
+		else
+			min = mid + 1;
+	}
+
+	/* No conversion found */
+	return opcode;
+}
+
+static u8 spi_nor_3to4_opcode(u8 opcode)
+{
+	/* MUST be sorted by 3byte opcode */
+#define ENTRY_3TO4(_opcode)	{ _opcode, _opcode##_4B }
+	static const struct spi_nor_address_entry spi_nor_3to4_table[] = {
+		ENTRY_3TO4(SPINOR_OP_PP),		/* 0x02 */
+		ENTRY_3TO4(SPINOR_OP_READ),		/* 0x03 */
+		ENTRY_3TO4(SPINOR_OP_READ_FAST),	/* 0x0b */
+		ENTRY_3TO4(SPINOR_OP_BE_4K),		/* 0x20 */
+		ENTRY_3TO4(SPINOR_OP_PP_1_1_4),		/* 0x32 */
+		ENTRY_3TO4(SPINOR_OP_PP_1_4_4),		/* 0x38 */
+		ENTRY_3TO4(SPINOR_OP_READ_1_1_2),	/* 0x3b */
+		ENTRY_3TO4(SPINOR_OP_BE_32K),		/* 0x52 */
+		ENTRY_3TO4(SPINOR_OP_READ_1_1_4),	/* 0x6b */
+		ENTRY_3TO4(SPINOR_OP_READ_1_2_2),	/* 0xbb */
+		ENTRY_3TO4(SPINOR_OP_SE),		/* 0xd8 */
+		ENTRY_3TO4(SPINOR_OP_READ_1_4_4),	/* 0xeb */
+	};
+#undef ENTRY_3TO4
+
+	return spi_nor_convert_opcode(opcode, spi_nor_3to4_table,
+				      ARRAY_SIZE(spi_nor_3to4_table));
+}
+
+static void spi_nor_set_4byte_opcodes(struct spi_nor *nor,
+				      const struct flash_info *info)
+{
+	/* Do some manufacturer fixups first */
+	switch (JEDEC_MFR(info)) {
+	case SNOR_MFR_SPANSION:
+		/* No small sector erase for 4-byte command set */
+		nor->erase_opcode = SPINOR_OP_SE;
+		nor->mtd.erasesize = info->sector_size;
+		break;
+
+	default:
+		break;
+	}
+
+	nor->read_opcode	= spi_nor_3to4_opcode(nor->read_opcode);
+	nor->program_opcode	= spi_nor_3to4_opcode(nor->program_opcode);
+	nor->erase_opcode	= spi_nor_3to4_opcode(nor->erase_opcode);
+}
+
 /* Enable/disable 4-byte addressing mode. */
 static inline int set_4byte(struct spi_nor *nor, const struct flash_info *info,
 			    int enable)
@@ -1476,27 +1555,10 @@ int spi_nor_scan(struct spi_nor *nor, const char *name, enum read_mode mode)
 	else if (mtd->size > 0x1000000) {
 		/* enable 4-byte addressing if the device exceeds 16MiB */
 		nor->addr_width = 4;
-		if (JEDEC_MFR(info) == SNOR_MFR_SPANSION) {
-			/* Dedicated 4-byte command set */
-			switch (nor->flash_read) {
-			case SPI_NOR_QUAD:
-				nor->read_opcode = SPINOR_OP_READ4_1_1_4;
-				break;
-			case SPI_NOR_DUAL:
-				nor->read_opcode = SPINOR_OP_READ4_1_1_2;
-				break;
-			case SPI_NOR_FAST:
-				nor->read_opcode = SPINOR_OP_READ4_FAST;
-				break;
-			case SPI_NOR_NORMAL:
-				nor->read_opcode = SPINOR_OP_READ4;
-				break;
-			}
-			nor->program_opcode = SPINOR_OP_PP_4B;
-			/* No small sector erase for 4-byte command set */
-			nor->erase_opcode = SPINOR_OP_SE_4B;
-			mtd->erasesize = info->sector_size;
-		} else
+		if (JEDEC_MFR(info) == SNOR_MFR_SPANSION ||
+		    info->flags & SPI_NOR_4B_OPCODES)
+			spi_nor_set_4byte_opcodes(nor, info);
+		else
 			set_4byte(nor, info, 1);
 	} else {
 		nor->addr_width = 3;
diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h
index c425c7b4c2a0..8b02fd7864d0 100644
--- a/include/linux/mtd/spi-nor.h
+++ b/include/linux/mtd/spi-nor.h
@@ -43,9 +43,13 @@
 #define SPINOR_OP_WRSR		0x01	/* Write status register 1 byte */
 #define SPINOR_OP_READ		0x03	/* Read data bytes (low frequency) */
 #define SPINOR_OP_READ_FAST	0x0b	/* Read data bytes (high frequency) */
-#define SPINOR_OP_READ_1_1_2	0x3b	/* Read data bytes (Dual SPI) */
-#define SPINOR_OP_READ_1_1_4	0x6b	/* Read data bytes (Quad SPI) */
+#define SPINOR_OP_READ_1_1_2	0x3b	/* Read data bytes (Dual Output SPI) */
+#define SPINOR_OP_READ_1_2_2	0xbb	/* Read data bytes (Dual I/O SPI) */
+#define SPINOR_OP_READ_1_1_4	0x6b	/* Read data bytes (Quad Output SPI) */
+#define SPINOR_OP_READ_1_4_4	0xeb	/* Read data bytes (Quad I/O SPI) */
 #define SPINOR_OP_PP		0x02	/* Page program (up to 256 bytes) */
+#define SPINOR_OP_PP_1_1_4	0x32	/* Quad page program */
+#define SPINOR_OP_PP_1_4_4	0x38	/* Quad page program */
 #define SPINOR_OP_BE_4K		0x20	/* Erase 4KiB block */
 #define SPINOR_OP_BE_4K_PMC	0xd7	/* Erase 4KiB block on PMC chips */
 #define SPINOR_OP_BE_32K	0x52	/* Erase 32KiB block */
@@ -56,11 +60,17 @@
 #define SPINOR_OP_RDFSR		0x70	/* Read flag status register */
 
 /* 4-byte address opcodes - used on Spansion and some Macronix flashes. */
-#define SPINOR_OP_READ4		0x13	/* Read data bytes (low frequency) */
-#define SPINOR_OP_READ4_FAST	0x0c	/* Read data bytes (high frequency) */
-#define SPINOR_OP_READ4_1_1_2	0x3c	/* Read data bytes (Dual SPI) */
-#define SPINOR_OP_READ4_1_1_4	0x6c	/* Read data bytes (Quad SPI) */
+#define SPINOR_OP_READ_4B	0x13	/* Read data bytes (low frequency) */
+#define SPINOR_OP_READ_FAST_4B	0x0c	/* Read data bytes (high frequency) */
+#define SPINOR_OP_READ_1_1_2_4B	0x3c	/* Read data bytes (Dual Output SPI) */
+#define SPINOR_OP_READ_1_2_2_4B	0xbc	/* Read data bytes (Dual I/O SPI) */
+#define SPINOR_OP_READ_1_1_4_4B	0x6c	/* Read data bytes (Quad Output SPI) */
+#define SPINOR_OP_READ_1_4_4_4B	0xec	/* Read data bytes (Quad I/O SPI) */
 #define SPINOR_OP_PP_4B		0x12	/* Page program (up to 256 bytes) */
+#define SPINOR_OP_PP_1_1_4_4B	0x34	/* Quad page program */
+#define SPINOR_OP_PP_1_4_4_4B	0x3e	/* Quad page program */
+#define SPINOR_OP_BE_4K_4B	0x21	/* Erase 4KiB block */
+#define SPINOR_OP_BE_32K_4B	0x5c	/* Erase 32KiB block */
 #define SPINOR_OP_SE_4B		0xdc	/* Sector erase (usually 64KiB) */
 
 /* Used for SST flashes only. */
-- 
2.7.4

[PATCH v3 3/9] mtd: spi-nor: add support of SPI protocols like SPI 1-2-2 and SPI 1-4-4

[Cyrille Pitchen]

This patch changes the prototype of spi_nor_scan(): its 3rd parameter
is replaced by a const struct spi_nor_modes pointer, which tells the
spi-nor framework about which SPI protocols are supported by the SPI
controller.

Besides, this patch also introduces a new spi_nor_basic_flash_parameter
structure telling the spi-nor framework about the SPI protocols supported
by the SPI memory and the needed op codes to use these SPI protocols.

Currently the struct spi_nor_basic_flash_parameter is filled with legacy
values but a later patch will allow to fill it dynamically by reading the
JESD216 Serial Flash Discoverable Parameter (SFDP) tables from the SPI
memory.

With both structures, the spi-nor framework can now compute the best
match between SPI protocols supported by both the (Q)SPI memory and
controller hence selecting the relevant op codes for (Fast) Read, Page
Program and Sector Erase operations.

The spi_nor_basic_flash_parameter structure also provides the spi-nor
framework with the number of dummy cycles to be used with each Fast Read
commands and the erase block size associated to the erase block op codes.

Finally the spi_nor_basic_flash_parameter structure, through the optional
.enable_quad_io() hook, tells the spi-nor framework how to set the Quad
Enable (QE) bit of the QSPI memory to enable its Quad SPI features.

Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
---
 drivers/mtd/devices/m25p80.c          |  17 ++-
 drivers/mtd/spi-nor/atmel-quadspi.c   |  83 ++++++----
 drivers/mtd/spi-nor/cadence-quadspi.c |  18 ++-
 drivers/mtd/spi-nor/fsl-quadspi.c     |   8 +-
 drivers/mtd/spi-nor/hisi-sfc.c        |  32 +++-
 drivers/mtd/spi-nor/mtk-quadspi.c     |  16 +-
 drivers/mtd/spi-nor/nxp-spifi.c       |  21 +--
 drivers/mtd/spi-nor/spi-nor.c         | 280 +++++++++++++++++++++++++++-------
 include/linux/mtd/spi-nor.h           | 136 +++++++++++++++--
 9 files changed, 482 insertions(+), 129 deletions(-)

diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
index 9cf7fcd28034..f0a55c01406b 100644
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -111,10 +111,10 @@ static ssize_t m25p80_write(struct spi_nor *nor, loff_t to, size_t len,
 
 static inline unsigned int m25p80_rx_nbits(struct spi_nor *nor)
 {
-	switch (nor->flash_read) {
-	case SPI_NOR_DUAL:
+	switch (SNOR_PROTO_DATA_FROM_PROTO(nor->read_proto)) {
+	case 2:
 		return 2;
-	case SPI_NOR_QUAD:
+	case 4:
 		return 4;
 	default:
 		return 0;
@@ -195,7 +195,10 @@ static int m25p_probe(struct spi_device *spi)
 	struct flash_platform_data	*data;
 	struct m25p *flash;
 	struct spi_nor *nor;
-	enum read_mode mode = SPI_NOR_NORMAL;
+	struct spi_nor_modes modes = {
+		.rd_modes = SNOR_MODE_SLOW,
+		.wr_modes = SNOR_MODE_1_1_1,
+	};
 	char *flash_name;
 	int ret;
 
@@ -221,9 +224,9 @@ static int m25p_probe(struct spi_device *spi)
 	flash->spi = spi;
 
 	if (spi->mode & SPI_RX_QUAD)
-		mode = SPI_NOR_QUAD;
+		modes.rd_modes |= SNOR_MODE_1_1_4;
 	else if (spi->mode & SPI_RX_DUAL)
-		mode = SPI_NOR_DUAL;
+		modes.rd_modes |= SNOR_MODE_1_1_2;
 
 	if (data && data->name)
 		nor->mtd.name = data->name;
@@ -240,7 +243,7 @@ static int m25p_probe(struct spi_device *spi)
 	else
 		flash_name = spi->modalias;
 
-	ret = spi_nor_scan(nor, flash_name, mode);
+	ret = spi_nor_scan(nor, flash_name, &modes);
 	if (ret)
 		return ret;
 
diff --git a/drivers/mtd/spi-nor/atmel-quadspi.c b/drivers/mtd/spi-nor/atmel-quadspi.c
index 47937d9beec6..9f7e3124e8b8 100644
--- a/drivers/mtd/spi-nor/atmel-quadspi.c
+++ b/drivers/mtd/spi-nor/atmel-quadspi.c
@@ -275,14 +275,48 @@ static void atmel_qspi_debug_command(struct atmel_qspi *aq,
 
 static int atmel_qspi_run_command(struct atmel_qspi *aq,
 				  const struct atmel_qspi_command *cmd,
-				  u32 ifr_tfrtyp, u32 ifr_width)
+				  u32 ifr_tfrtyp, enum spi_nor_protocol proto)
 {
 	u32 iar, icr, ifr, sr;
 	int err = 0;
 
 	iar = 0;
 	icr = 0;
-	ifr = ifr_tfrtyp | ifr_width;
+	ifr = ifr_tfrtyp;
+
+	/* Set the SPI protocol */
+	switch (proto) {
+	case SNOR_PROTO_1_1_1:
+		ifr |= QSPI_IFR_WIDTH_SINGLE_BIT_SPI;
+		break;
+
+	case SNOR_PROTO_1_1_2:
+		ifr |= QSPI_IFR_WIDTH_DUAL_OUTPUT;
+		break;
+
+	case SNOR_PROTO_1_1_4:
+		ifr |= QSPI_IFR_WIDTH_QUAD_OUTPUT;
+		break;
+
+	case SNOR_PROTO_1_2_2:
+		ifr |= QSPI_IFR_WIDTH_DUAL_IO;
+		break;
+
+	case SNOR_PROTO_1_4_4:
+		ifr |= QSPI_IFR_WIDTH_QUAD_IO;
+		break;
+
+	case SNOR_PROTO_2_2_2:
+		ifr |= QSPI_IFR_WIDTH_DUAL_CMD;
+		break;
+
+	case SNOR_PROTO_4_4_4:
+		ifr |= QSPI_IFR_WIDTH_QUAD_CMD;
+		break;
+
+	default:
+		return -EINVAL;
+	}
 
 	/* Compute instruction parameters */
 	if (cmd->enable.bits.instruction) {
@@ -434,7 +468,7 @@ static int atmel_qspi_read_reg(struct spi_nor *nor, u8 opcode,
 	cmd.rx_buf = buf;
 	cmd.buf_len = len;
 	return atmel_qspi_run_command(aq, &cmd, QSPI_IFR_TFRTYP_TRSFR_READ,
-				      QSPI_IFR_WIDTH_SINGLE_BIT_SPI);
+				      nor->reg_proto);
 }
 
 static int atmel_qspi_write_reg(struct spi_nor *nor, u8 opcode,
@@ -450,7 +484,7 @@ static int atmel_qspi_write_reg(struct spi_nor *nor, u8 opcode,
 	cmd.tx_buf = buf;
 	cmd.buf_len = len;
 	return atmel_qspi_run_command(aq, &cmd, QSPI_IFR_TFRTYP_TRSFR_WRITE,
-				      QSPI_IFR_WIDTH_SINGLE_BIT_SPI);
+				      nor->reg_proto);
 }
 
 static ssize_t atmel_qspi_write(struct spi_nor *nor, loff_t to, size_t len,
@@ -469,7 +503,7 @@ static ssize_t atmel_qspi_write(struct spi_nor *nor, loff_t to, size_t len,
 	cmd.tx_buf = write_buf;
 	cmd.buf_len = len;
 	ret = atmel_qspi_run_command(aq, &cmd, QSPI_IFR_TFRTYP_TRSFR_WRITE_MEM,
-				     QSPI_IFR_WIDTH_SINGLE_BIT_SPI);
+				     nor->write_proto);
 	return (ret < 0) ? ret : len;
 }
 
@@ -484,7 +518,7 @@ static int atmel_qspi_erase(struct spi_nor *nor, loff_t offs)
 	cmd.instruction = nor->erase_opcode;
 	cmd.address = (u32)offs;
 	return atmel_qspi_run_command(aq, &cmd, QSPI_IFR_TFRTYP_TRSFR_WRITE,
-				      QSPI_IFR_WIDTH_SINGLE_BIT_SPI);
+				      nor->reg_proto);
 }
 
 static ssize_t atmel_qspi_read(struct spi_nor *nor, loff_t from, size_t len,
@@ -493,27 +527,8 @@ static ssize_t atmel_qspi_read(struct spi_nor *nor, loff_t from, size_t len,
 	struct atmel_qspi *aq = nor->priv;
 	struct atmel_qspi_command cmd;
 	u8 num_mode_cycles, num_dummy_cycles;
-	u32 ifr_width;
 	ssize_t ret;
 
-	switch (nor->flash_read) {
-	case SPI_NOR_NORMAL:
-	case SPI_NOR_FAST:
-		ifr_width = QSPI_IFR_WIDTH_SINGLE_BIT_SPI;
-		break;
-
-	case SPI_NOR_DUAL:
-		ifr_width = QSPI_IFR_WIDTH_DUAL_OUTPUT;
-		break;
-
-	case SPI_NOR_QUAD:
-		ifr_width = QSPI_IFR_WIDTH_QUAD_OUTPUT;
-		break;
-
-	default:
-		return -EINVAL;
-	}
-
 	if (nor->read_dummy >= 2) {
 		num_mode_cycles = 2;
 		num_dummy_cycles = nor->read_dummy - 2;
@@ -536,7 +551,7 @@ static ssize_t atmel_qspi_read(struct spi_nor *nor, loff_t from, size_t len,
 	cmd.rx_buf = read_buf;
 	cmd.buf_len = len;
 	ret = atmel_qspi_run_command(aq, &cmd, QSPI_IFR_TFRTYP_TRSFR_READ_MEM,
-				     ifr_width);
+				     nor->read_proto);
 	return (ret < 0) ? ret : len;
 }
 
@@ -596,6 +611,20 @@ static int atmel_qspi_probe(struct platform_device *pdev)
 	struct spi_nor *nor;
 	struct mtd_info *mtd;
 	int irq, err = 0;
+	struct spi_nor_modes modes = {
+		.rd_modes = (SNOR_MODE_SLOW |
+			     SNOR_MODE_1_1_1 |
+			     SNOR_MODE_1_1_2 |
+			     SNOR_MODE_1_1_4 |
+			     SNOR_MODE_1_2_2 |
+			     SNOR_MODE_1_4_4),
+		.wr_modes = (SNOR_MODE_SLOW |
+			     SNOR_MODE_1_1_1 |
+			     SNOR_MODE_1_1_2 |
+			     SNOR_MODE_1_1_4 |
+			     SNOR_MODE_1_2_2 |
+			     SNOR_MODE_1_4_4),
+	};
 
 	if (of_get_child_count(np) != 1)
 		return -ENODEV;
@@ -679,7 +708,7 @@ static int atmel_qspi_probe(struct platform_device *pdev)
 	if (err)
 		goto disable_clk;
 
-	err = spi_nor_scan(nor, NULL, SPI_NOR_QUAD);
+	err = spi_nor_scan(nor, NULL, &modes);
 	if (err)
 		goto disable_clk;
 
diff --git a/drivers/mtd/spi-nor/cadence-quadspi.c b/drivers/mtd/spi-nor/cadence-quadspi.c
index d403ba7b8f43..87e49231b4ee 100644
--- a/drivers/mtd/spi-nor/cadence-quadspi.c
+++ b/drivers/mtd/spi-nor/cadence-quadspi.c
@@ -853,15 +853,14 @@ static int cqspi_set_protocol(struct spi_nor *nor, const int read)
 	f_pdata->data_width = CQSPI_INST_TYPE_SINGLE;
 
 	if (read) {
-		switch (nor->flash_read) {
-		case SPI_NOR_NORMAL:
-		case SPI_NOR_FAST:
+		switch (nor->read_proto) {
+		case SNOR_PROTO_1_1_1:
 			f_pdata->data_width = CQSPI_INST_TYPE_SINGLE;
 			break;
-		case SPI_NOR_DUAL:
+		case SNOR_PROTO_1_1_2:
 			f_pdata->data_width = CQSPI_INST_TYPE_DUAL;
 			break;
-		case SPI_NOR_QUAD:
+		case SNOR_PROTO_1_1_4:
 			f_pdata->data_width = CQSPI_INST_TYPE_QUAD;
 			break;
 		default:
@@ -1074,6 +1073,13 @@ static int cqspi_setup_flash(struct cqspi_st *cqspi, struct device_node *np)
 	struct mtd_info *mtd;
 	unsigned int cs;
 	int i, ret;
+	static const struct spi_nor_modes modes = {
+		.rd_modes = (SNOR_MODE_SLOW |
+			     SNOR_MODE_1_1_1 |
+			     SNOR_MODE_1_1_2 |
+			     SNOR_MODE_1_1_4),
+		.wr_modes = SNOR_MODE_1_1_1,
+	};
 
 	/* Get flash device data */
 	for_each_available_child_of_node(dev->of_node, np) {
@@ -1119,7 +1125,7 @@ static int cqspi_setup_flash(struct cqspi_st *cqspi, struct device_node *np)
 			goto err;
 		}
 
-		ret = spi_nor_scan(nor, NULL, SPI_NOR_QUAD);
+		ret = spi_nor_scan(nor, NULL, &modes);
 		if (ret)
 			goto err;
 
diff --git a/drivers/mtd/spi-nor/fsl-quadspi.c b/drivers/mtd/spi-nor/fsl-quadspi.c
index 5c82e4ef1904..01e7356d6623 100644
--- a/drivers/mtd/spi-nor/fsl-quadspi.c
+++ b/drivers/mtd/spi-nor/fsl-quadspi.c
@@ -980,6 +980,12 @@ static int fsl_qspi_probe(struct platform_device *pdev)
 	struct spi_nor *nor;
 	struct mtd_info *mtd;
 	int ret, i = 0;
+	static const struct spi_nor_modes modes = {
+		.rd_modes = (SNOR_MODE_SLOW |
+			     SNOR_MODE_1_1_1 |
+			     SNOR_MODE_1_1_4),
+		.wr_modes = SNOR_MODE_1_1_1,
+	};
 
 	q = devm_kzalloc(dev, sizeof(*q), GFP_KERNEL);
 	if (!q)
@@ -1081,7 +1087,7 @@ static int fsl_qspi_probe(struct platform_device *pdev)
 		/* set the chip address for READID */
 		fsl_qspi_set_base_addr(q, nor);
 
-		ret = spi_nor_scan(nor, NULL, SPI_NOR_QUAD);
+		ret = spi_nor_scan(nor, NULL, &modes);
 		if (ret)
 			goto mutex_failed;
 
diff --git a/drivers/mtd/spi-nor/hisi-sfc.c b/drivers/mtd/spi-nor/hisi-sfc.c
index 20378b0d55e9..e4d7625b4397 100644
--- a/drivers/mtd/spi-nor/hisi-sfc.c
+++ b/drivers/mtd/spi-nor/hisi-sfc.c
@@ -120,19 +120,24 @@ static inline int wait_op_finish(struct hifmc_host *host)
 		(reg & FMC_INT_OP_DONE), 0, FMC_WAIT_TIMEOUT);
 }
 
-static int get_if_type(enum read_mode flash_read)
+static int get_if_type(enum spi_nor_protocol proto)
 {
 	enum hifmc_iftype if_type;
 
-	switch (flash_read) {
-	case SPI_NOR_DUAL:
+	switch (proto) {
+	case SNOR_PROTO_1_1_2:
 		if_type = IF_TYPE_DUAL;
 		break;
-	case SPI_NOR_QUAD:
+	case SNOR_PROTO_1_2_2:
+		if_type = IF_TYPE_DIO;
+		break;
+	case SNOR_PROTO_1_1_4:
 		if_type = IF_TYPE_QUAD;
 		break;
-	case SPI_NOR_NORMAL:
-	case SPI_NOR_FAST:
+	case SNOR_PROTO_1_4_4:
+		if_type = IF_TYPE_QIO;
+		break;
+	case SNOR_PROTO_1_1_1:
 	default:
 		if_type = IF_TYPE_STD;
 		break;
@@ -238,6 +243,7 @@ static int hisi_spi_nor_dma_transfer(struct spi_nor *nor, loff_t start_off,
 {
 	struct hifmc_priv *priv = nor->priv;
 	struct hifmc_host *host = priv->host;
+	enum spi_nor_protocol proto;
 	u8 if_type = 0;
 	u32 reg;
 
@@ -253,7 +259,10 @@ static int hisi_spi_nor_dma_transfer(struct spi_nor *nor, loff_t start_off,
 	writel(FMC_DMA_LEN_SET(len), host->regbase + FMC_DMA_LEN);
 
 	reg = OP_CFG_FM_CS(priv->chipselect);
-	if_type = get_if_type(nor->flash_read);
+	proto = (op_type == FMC_OP_READ)
+		? nor->read_proto
+		: nor->write_proto;
+	if_type = get_if_type(proto);
 	reg |= OP_CFG_MEM_IF_TYPE(if_type);
 	if (op_type == FMC_OP_READ)
 		reg |= OP_CFG_DUMMY_NUM(nor->read_dummy >> 3);
@@ -326,6 +335,13 @@ static int hisi_spi_nor_register(struct device_node *np,
 	struct hifmc_priv *priv;
 	struct mtd_info *mtd;
 	int ret;
+	static const struct spi_nor_modes modes = {
+		.rd_modes = (SNOR_MODE_SLOW |
+			     SNOR_MODE_1_1_1 |
+			     SNOR_MODE_1_1_2 |
+			     SNOR_MODE_1_1_4),
+		.wr_modes = SNOR_MODE_1_1_1,
+	};
 
 	nor = devm_kzalloc(dev, sizeof(*nor), GFP_KERNEL);
 	if (!nor)
@@ -362,7 +378,7 @@ static int hisi_spi_nor_register(struct device_node *np,
 	nor->read = hisi_spi_nor_read;
 	nor->write = hisi_spi_nor_write;
 	nor->erase = NULL;
-	ret = spi_nor_scan(nor, NULL, SPI_NOR_QUAD);
+	ret = spi_nor_scan(nor, NULL, &modes);
 	if (ret)
 		return ret;
 
diff --git a/drivers/mtd/spi-nor/mtk-quadspi.c b/drivers/mtd/spi-nor/mtk-quadspi.c
index e661877c23de..4dc2bb8eb488 100644
--- a/drivers/mtd/spi-nor/mtk-quadspi.c
+++ b/drivers/mtd/spi-nor/mtk-quadspi.c
@@ -121,20 +121,20 @@ static void mt8173_nor_set_read_mode(struct mt8173_nor *mt8173_nor)
 {
 	struct spi_nor *nor = &mt8173_nor->nor;
 
-	switch (nor->flash_read) {
-	case SPI_NOR_FAST:
+	switch (SNOR_PROTO_DATA_FROM_PROTO(nor->read_proto)) {
+	case 1:
 		writeb(nor->read_opcode, mt8173_nor->base +
 		       MTK_NOR_PRGDATA3_REG);
 		writeb(MTK_NOR_FAST_READ, mt8173_nor->base +
 		       MTK_NOR_CFG1_REG);
 		break;
-	case SPI_NOR_DUAL:
+	case 2:
 		writeb(nor->read_opcode, mt8173_nor->base +
 		       MTK_NOR_PRGDATA3_REG);
 		writeb(MTK_NOR_DUAL_READ_EN, mt8173_nor->base +
 		       MTK_NOR_DUAL_REG);
 		break;
-	case SPI_NOR_QUAD:
+	case 4:
 		writeb(nor->read_opcode, mt8173_nor->base +
 		       MTK_NOR_PRGDATA4_REG);
 		writeb(MTK_NOR_QUAD_READ_EN, mt8173_nor->base +
@@ -383,6 +383,12 @@ static int mtk_nor_init(struct mt8173_nor *mt8173_nor,
 {
 	int ret;
 	struct spi_nor *nor;
+	static const struct spi_nor_modes modes = {
+		.rd_modes = (SNOR_MODE_SLOW |
+			     SNOR_MODE_1_1_1 |
+			     SNOR_MODE_1_1_2),
+		.wr_modes = SNOR_MODE_1_1_1,
+	};
 
 	/* initialize controller to accept commands */
 	writel(MTK_NOR_ENABLE_SF_CMD, mt8173_nor->base + MTK_NOR_WRPROT_REG);
@@ -399,7 +405,7 @@ static int mtk_nor_init(struct mt8173_nor *mt8173_nor,
 	nor->write_reg = mt8173_nor_write_reg;
 	nor->mtd.name = "mtk_nor";
 	/* initialized with NULL */
-	ret = spi_nor_scan(nor, NULL, SPI_NOR_DUAL);
+	ret = spi_nor_scan(nor, NULL, &modes);
 	if (ret)
 		return ret;
 
diff --git a/drivers/mtd/spi-nor/nxp-spifi.c b/drivers/mtd/spi-nor/nxp-spifi.c
index 73a14f40928b..327c5b5fe9da 100644
--- a/drivers/mtd/spi-nor/nxp-spifi.c
+++ b/drivers/mtd/spi-nor/nxp-spifi.c
@@ -240,13 +240,12 @@ static int nxp_spifi_erase(struct spi_nor *nor, loff_t offs)
 
 static int nxp_spifi_setup_memory_cmd(struct nxp_spifi *spifi)
 {
-	switch (spifi->nor.flash_read) {
-	case SPI_NOR_NORMAL:
-	case SPI_NOR_FAST:
+	switch (SNOR_PROTO_DATA_FROM_PROTO(spifi->nor.read_proto)) {
+	case 1:
 		spifi->mcmd = SPIFI_CMD_FIELDFORM_ALL_SERIAL;
 		break;
-	case SPI_NOR_DUAL:
-	case SPI_NOR_QUAD:
+	case 2:
+	case 4:
 		spifi->mcmd = SPIFI_CMD_FIELDFORM_QUAD_DUAL_DATA;
 		break;
 	default:
@@ -274,7 +273,10 @@ static void nxp_spifi_dummy_id_read(struct spi_nor *nor)
 static int nxp_spifi_setup_flash(struct nxp_spifi *spifi,
 				 struct device_node *np)
 {
-	enum read_mode flash_read;
+	struct spi_nor_modes modes = {
+		.rd_modes = (SNOR_MODE_SLOW | SNOR_MODE_1_1_1),
+		.wr_modes = SNOR_MODE_1_1_1,
+	};
 	u32 ctrl, property;
 	u16 mode = 0;
 	int ret;
@@ -308,13 +310,12 @@ static int nxp_spifi_setup_flash(struct nxp_spifi *spifi,
 
 	if (mode & SPI_RX_DUAL) {
 		ctrl |= SPIFI_CTRL_DUAL;
-		flash_read = SPI_NOR_DUAL;
+		modes.rd_modes |= SNOR_MODE_1_1_2;
 	} else if (mode & SPI_RX_QUAD) {
 		ctrl &= ~SPIFI_CTRL_DUAL;
-		flash_read = SPI_NOR_QUAD;
+		modes.rd_modes |= SNOR_MODE_1_1_4;
 	} else {
 		ctrl |= SPIFI_CTRL_DUAL;
-		flash_read = SPI_NOR_NORMAL;
 	}
 
 	switch (mode & (SPI_CPHA | SPI_CPOL)) {
@@ -351,7 +352,7 @@ static int nxp_spifi_setup_flash(struct nxp_spifi *spifi,
 	 */
 	nxp_spifi_dummy_id_read(&spifi->nor);
 
-	ret = spi_nor_scan(&spifi->nor, NULL, flash_read);
+	ret = spi_nor_scan(&spifi->nor, NULL, &modes);
 	if (ret) {
 		dev_err(spifi->dev, "device scan failed\n");
 		return ret;
diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index 423448c1c7a8..05000b010e7f 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -143,24 +143,6 @@ static int read_cr(struct spi_nor *nor)
 }
 
 /*
- * Dummy Cycle calculation for different type of read.
- * It can be used to support more commands with
- * different dummy cycle requirements.
- */
-static inline int spi_nor_read_dummy_cycles(struct spi_nor *nor)
-{
-	switch (nor->flash_read) {
-	case SPI_NOR_FAST:
-	case SPI_NOR_DUAL:
-	case SPI_NOR_QUAD:
-		return 8;
-	case SPI_NOR_NORMAL:
-		return 0;
-	}
-	return 0;
-}
-
-/*
  * Write status register 1 byte
  * Returns negative if error occurred.
  */
@@ -1384,8 +1366,206 @@ static int spi_nor_check(struct spi_nor *nor)
 	return 0;
 }
 
-int spi_nor_scan(struct spi_nor *nor, const char *name, enum read_mode mode)
+static inline void spi_nor_set_read_settings(struct spi_nor_read *read,
+					     u8 num_mode_clocks,
+					     u8 num_wait_states,
+					     u8 opcode)
+{
+	read->num_mode_clocks = num_mode_clocks;
+	read->num_wait_states = num_wait_states;
+	read->opcode = opcode;
+}
+
+static inline void spi_nor_set_erase_settings(struct spi_nor_erase_type *erase,
+					      u8 size, u8 opcode)
+{
+	erase->size = size;
+	erase->opcode = opcode;
+}
+
+static int spi_nor_init_params(struct spi_nor *nor,
+			       const struct flash_info *info,
+			       struct spi_nor_basic_flash_parameter *params)
+{
+	// TODO: parse SFDP table
+
+	/* If SFDP tables are not available, use legacy settings. */
+	memset(params, 0, sizeof(*params));
+
+	/* (Fast) Read settings. */
+	params->rd_modes = SNOR_MODE_SLOW;
+	spi_nor_set_read_settings(&params->reads[SNOR_PINDEX_SLOW],
+				  0, 0, SPINOR_OP_READ);
+	if (!(info->flags & SPI_NOR_NO_FR)) {
+		params->rd_modes |= SNOR_MODE_1_1_1;
+		spi_nor_set_read_settings(&params->reads[SNOR_PINDEX_1_1_1],
+					  0, 8, SPINOR_OP_READ_FAST);
+	}
+	if (info->flags & SPI_NOR_DUAL_READ) {
+		params->rd_modes |= SNOR_MODE_1_1_2;
+		spi_nor_set_read_settings(&params->reads[SNOR_PINDEX_1_1_2],
+					  0, 8, SPINOR_OP_READ_1_1_2);
+	}
+	if (info->flags & SPI_NOR_QUAD_READ) {
+		params->rd_modes |= SNOR_MODE_1_1_4;
+		spi_nor_set_read_settings(&params->reads[SNOR_PINDEX_1_1_4],
+					  0, 8, SPINOR_OP_READ_1_1_4);
+	}
+
+	/* Page Program settings. */
+	params->wr_modes = SNOR_MODE_1_1_1;
+	params->page_programs[SNOR_PINDEX_1_1_1] = SPINOR_OP_PP;
+
+	/* Sector Erase settings. */
+	spi_nor_set_erase_settings(&params->erase_types[0],
+				   SNOR_ERASE_64K, SPINOR_OP_SE);
+	if (info->flags & SECT_4K)
+		spi_nor_set_erase_settings(&params->erase_types[1],
+					   SNOR_ERASE_4K, SPINOR_OP_BE_4K);
+	else if (info->flags & SECT_4K_PMC)
+		spi_nor_set_erase_settings(&params->erase_types[1],
+					   SNOR_ERASE_4K, SPINOR_OP_BE_4K_PMC);
+
+	/* Select the procedure to set the Quad Enable bit. */
+	if (params->rd_modes & (SNOR_MODE_1_1_4 |
+				SNOR_MODE_1_4_4 |
+				SNOR_MODE_4_4_4)) {
+		switch (JEDEC_MFR(info)) {
+		case SNOR_MFR_MACRONIX:
+			params->enable_quad_io = macronix_quad_enable;
+			break;
+
+		case SNOR_MFR_MICRON:
+			break;
+
+		default:
+			params->enable_quad_io = spansion_quad_enable;
+			break;
+		}
+	}
+
+	return 0;
+}
+
+static int spi_nor_pindex2proto(int pindex, enum spi_nor_protocol *proto)
+{
+	enum spi_nor_protocol_width pwidth;
+	enum spi_nor_protocol_class pclass;
+	uint8_t width;
+
+	if (pindex < 0)
+		return -EINVAL;
+
+	pwidth = (enum spi_nor_protocol_width)(pindex / SNOR_PCLASS_MAX);
+	pclass = (enum spi_nor_protocol_class)(pindex % SNOR_PCLASS_MAX);
+
+	width = (1 << pwidth) & 0xf;
+	if (!width)
+		return -EINVAL;
+
+	switch (pclass) {
+	case SNOR_PCLASS_1_1_N:
+		*proto = SNOR_PROTO(1, 1, width);
+		break;
+
+	case SNOR_PCLASS_1_N_N:
+		*proto = SNOR_PROTO(1, width, width);
+		break;
+
+	case SNOR_PCLASS_N_N_N:
+		*proto = SNOR_PROTO(width, width, width);
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int spi_nor_setup(struct spi_nor *nor, const struct flash_info *info,
+			 const struct spi_nor_basic_flash_parameter *params,
+			 const struct spi_nor_modes *modes)
 {
+	bool enable_quad_io;
+	u32 rd_modes, wr_modes, mask;
+	const struct spi_nor_erase_type *erase_type = NULL;
+	const struct spi_nor_read *read;
+	int rd_pindex, wr_pindex, i, err = 0;
+	u8 erase_size = SNOR_ERASE_64K;
+
+	/* 2-2-2 or 4-4-4 modes are not supported yet. */
+	mask = (SNOR_MODE_2_2_2 | SNOR_MODE_4_4_4);
+	rd_modes = modes->rd_modes & ~mask;
+	wr_modes = modes->wr_modes & ~mask;
+
+	/* Setup read operation. */
+	rd_pindex = fls(params->rd_modes & rd_modes) - 1;
+	if (spi_nor_pindex2proto(rd_pindex, &nor->read_proto)) {
+		dev_err(nor->dev, "invalid (fast) read\n");
+		return -EINVAL;
+	}
+	read = &params->reads[rd_pindex];
+	nor->read_opcode = read->opcode;
+	nor->read_dummy = read->num_mode_clocks + read->num_wait_states;
+
+	/* Set page program op code and protocol. */
+	wr_pindex = fls(params->wr_modes & wr_modes) - 1;
+	if (spi_nor_pindex2proto(wr_pindex, &nor->write_proto)) {
+		dev_err(nor->dev, "invalid page program\n");
+		return -EINVAL;
+	}
+	nor->program_opcode = params->page_programs[wr_pindex];
+
+	/* Set sector erase op code and size. */
+	erase_type = &params->erase_types[0];
+#ifdef CONFIG_MTD_SPI_NOR_USE_4K_SECTORS
+	erase_size = SNOR_ERASE_4K;
+#endif
+	for (i = 0; i < SNOR_MAX_ERASE_TYPES; ++i) {
+		if (params->erase_types[i].size == erase_size) {
+			erase_type = &params->erase_types[i];
+			break;
+		} else if (!erase_type->size && params->erase_types[i].size) {
+			erase_type = &params->erase_types[i];
+		}
+	}
+	nor->erase_opcode = erase_type->opcode;
+	nor->mtd.erasesize = (1 << erase_type->size);
+
+
+	enable_quad_io = (SNOR_PROTO_DATA_FROM_PROTO(nor->read_proto) == 4 ||
+			  SNOR_PROTO_DATA_FROM_PROTO(nor->write_proto) == 4);
+
+	/* Enable Quad I/O if needed. */
+	if (enable_quad_io && params->enable_quad_io) {
+		err = params->enable_quad_io(nor);
+		if (err) {
+			dev_err(nor->dev,
+				"failed to enable the Quad I/O mode\n");
+			return err;
+		}
+	}
+
+	dev_dbg(nor->dev,
+		"(Fast) Read:  opcode=%02Xh, protocol=%03x, mode=%u, wait=%u\n",
+		nor->read_opcode, nor->read_proto,
+		read->num_mode_clocks, read->num_wait_states);
+	dev_dbg(nor->dev,
+		"Page Program: opcode=%02Xh, protocol=%03x\n",
+		nor->program_opcode, nor->write_proto);
+	dev_dbg(nor->dev,
+		"Sector Erase: opcode=%02Xh, protocol=%03x, sector size=%u\n",
+		nor->erase_opcode, nor->reg_proto, (u32)nor->mtd.erasesize);
+
+	return 0;
+}
+
+int spi_nor_scan(struct spi_nor *nor, const char *name,
+		 const struct spi_nor_modes *modes)
+{
+	struct spi_nor_basic_flash_parameter params;
+	struct spi_nor_modes fixed_modes = *modes;
 	const struct flash_info *info = NULL;
 	struct device *dev = nor->dev;
 	struct mtd_info *mtd = &nor->mtd;
@@ -1397,6 +1577,11 @@ int spi_nor_scan(struct spi_nor *nor, const char *name, enum read_mode mode)
 	if (ret)
 		return ret;
 
+	/* Reset SPI protocol for all commands */
+	nor->reg_proto = SNOR_PROTO_1_1_1;
+	nor->read_proto = SNOR_PROTO_1_1_1;
+	nor->write_proto = SNOR_PROTO_1_1_1;
+
 	if (name)
 		info = spi_nor_match_id(name);
 	/* Try to auto-detect if chip name wasn't specified or not found */
@@ -1429,6 +1614,11 @@ int spi_nor_scan(struct spi_nor *nor, const char *name, enum read_mode mode)
 		}
 	}
 
+	/* Parse the Serial Flash Discoverable Parameters table */
+	ret = spi_nor_init_params(nor, info, &params);
+	if (ret)
+		return ret;
+
 	mutex_init(&nor->lock);
 
 	/*
@@ -1505,51 +1695,31 @@ int spi_nor_scan(struct spi_nor *nor, const char *name, enum read_mode mode)
 	if (np) {
 		/* If we were instantiated by DT, use it */
 		if (of_property_read_bool(np, "m25p,fast-read"))
-			nor->flash_read = SPI_NOR_FAST;
+			fixed_modes.rd_modes |= SNOR_MODE_1_1_1;
 		else
-			nor->flash_read = SPI_NOR_NORMAL;
+			fixed_modes.rd_modes &= ~SNOR_MODE_1_1_1;
 	} else {
 		/* If we weren't instantiated by DT, default to fast-read */
-		nor->flash_read = SPI_NOR_FAST;
+		fixed_modes.rd_modes |= SNOR_MODE_1_1_1;
 	}
 
 	/* Some devices cannot do fast-read, no matter what DT tells us */
 	if (info->flags & SPI_NOR_NO_FR)
-		nor->flash_read = SPI_NOR_NORMAL;
-
-	/* Quad/Dual-read mode takes precedence over fast/normal */
-	if (mode == SPI_NOR_QUAD && info->flags & SPI_NOR_QUAD_READ) {
-		ret = set_quad_mode(nor, info);
-		if (ret) {
-			dev_err(dev, "quad mode not supported\n");
-			return ret;
-		}
-		nor->flash_read = SPI_NOR_QUAD;
-	} else if (mode == SPI_NOR_DUAL && info->flags & SPI_NOR_DUAL_READ) {
-		nor->flash_read = SPI_NOR_DUAL;
-	}
-
-	/* Default commands */
-	switch (nor->flash_read) {
-	case SPI_NOR_QUAD:
-		nor->read_opcode = SPINOR_OP_READ_1_1_4;
-		break;
-	case SPI_NOR_DUAL:
-		nor->read_opcode = SPINOR_OP_READ_1_1_2;
-		break;
-	case SPI_NOR_FAST:
-		nor->read_opcode = SPINOR_OP_READ_FAST;
-		break;
-	case SPI_NOR_NORMAL:
-		nor->read_opcode = SPINOR_OP_READ;
-		break;
-	default:
-		dev_err(dev, "No Read opcode defined\n");
-		return -EINVAL;
-	}
+		fixed_modes.rd_modes &= ~SNOR_MODE_1_1_1;
 
 	nor->program_opcode = SPINOR_OP_PP;
 
+	/*
+	 * Configure the SPI memory:
+	 * - select op codes for (Fast) Read, Page Program and Sector Erase.
+	 * - set the number of dummy cycles (mode cycles + wait states).
+	 * - set the SPI protocols for register and memory accesses.
+	 * - set the Quad Enable bit if needed (required by SPI x-y-4 protos).
+	 */
+	ret = spi_nor_setup(nor, info, &params, &fixed_modes);
+	if (ret)
+		return ret;
+
 	if (info->addr_width)
 		nor->addr_width = info->addr_width;
 	else if (mtd->size > 0x1000000) {
@@ -1570,8 +1740,6 @@ int spi_nor_scan(struct spi_nor *nor, const char *name, enum read_mode mode)
 		return -EINVAL;
 	}
 
-	nor->read_dummy = spi_nor_read_dummy_cycles(nor);
-
 	dev_info(dev, "%s (%lld Kbytes)\n", info->name,
 			(long long)mtd->size >> 10);
 
diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h
index 8b02fd7864d0..88ac446b1230 100644
--- a/include/linux/mtd/spi-nor.h
+++ b/include/linux/mtd/spi-nor.h
@@ -110,11 +110,124 @@
 /* Configuration Register bits. */
 #define CR_QUAD_EN_SPAN		BIT(1)	/* Spansion Quad I/O */
 
-enum read_mode {
-	SPI_NOR_NORMAL = 0,
-	SPI_NOR_FAST,
-	SPI_NOR_DUAL,
-	SPI_NOR_QUAD,
+
+/* Supported SPI protocols */
+enum spi_nor_protocol_class {
+	SNOR_PCLASS_1_1_N,
+	SNOR_PCLASS_1_N_N,
+	SNOR_PCLASS_N_N_N,
+
+	SNOR_PCLASS_MAX
+};
+
+enum spi_nor_protocol_width {
+	SNOR_PWIDTH_1,
+	SNOR_PWIDTH_2,
+	SNOR_PWIDTH_4,
+	SNOR_PWIDTH_8,
+};
+
+/* The encoding is chosen so the higher index the higher priority */
+#define SNOR_PINDEX(pwidth, pclass) \
+	((pwidth) * SNOR_PCLASS_MAX + (pclass))
+enum spi_nor_protocol_index {
+	SNOR_PINDEX_SLOW  = SNOR_PINDEX(SNOR_PWIDTH_1, SNOR_PCLASS_1_1_N),
+	/* Little trick to make the difference between Read and Fast Read. */
+	SNOR_PINDEX_1_1_1 = SNOR_PINDEX(SNOR_PWIDTH_1, SNOR_PCLASS_1_N_N),
+	SNOR_PINDEX_1_1_2 = SNOR_PINDEX(SNOR_PWIDTH_2, SNOR_PCLASS_1_1_N),
+	SNOR_PINDEX_1_2_2 = SNOR_PINDEX(SNOR_PWIDTH_2, SNOR_PCLASS_1_N_N),
+	SNOR_PINDEX_2_2_2 = SNOR_PINDEX(SNOR_PWIDTH_2, SNOR_PCLASS_N_N_N),
+	SNOR_PINDEX_1_1_4 = SNOR_PINDEX(SNOR_PWIDTH_4, SNOR_PCLASS_1_1_N),
+	SNOR_PINDEX_1_4_4 = SNOR_PINDEX(SNOR_PWIDTH_4, SNOR_PCLASS_1_N_N),
+	SNOR_PINDEX_4_4_4 = SNOR_PINDEX(SNOR_PWIDTH_4, SNOR_PCLASS_N_N_N),
+
+	SNOR_PINDEX_MAX
+};
+
+#define SNOR_MODE_SLOW		BIT(SNOR_PINDEX_SLOW)
+#define SNOR_MODE_1_1_1		BIT(SNOR_PINDEX_1_1_1)
+#define SNOR_MODE_1_1_2		BIT(SNOR_PINDEX_1_1_2)
+#define SNOR_MODE_1_2_2		BIT(SNOR_PINDEX_1_2_2)
+#define SNOR_MODE_2_2_2		BIT(SNOR_PINDEX_2_2_2)
+#define SNOR_MODE_1_1_4		BIT(SNOR_PINDEX_1_1_4)
+#define SNOR_MODE_1_4_4		BIT(SNOR_PINDEX_1_4_4)
+#define SNOR_MODE_4_4_4		BIT(SNOR_PINDEX_4_4_4)
+
+struct spi_nor_modes {
+	u32	rd_modes;	/* supported SPI modes for (Fast) Read */
+	u32	wr_modes;	/* supported SPI modes for Page Program */
+};
+
+
+struct spi_nor_read {
+	u8	num_wait_states:5;
+	u8	num_mode_clocks:3;
+	u8	opcode;
+};
+
+struct spi_nor_erase_type {
+	u8	size;	/* specifies 'N' so erase size = 2^N */
+	u8	opcode;
+};
+
+#define SNOR_ERASE_64K		0x10
+#define SNOR_ERASE_32K		0x0f
+#define SNOR_ERASE_4K		0x0c
+
+struct spi_nor;
+
+#define SNOR_MAX_ERASE_TYPES	4
+
+struct spi_nor_basic_flash_parameter {
+	/* Fast Read settings */
+	u32				rd_modes;
+	struct spi_nor_read		reads[SNOR_PINDEX_MAX];
+
+	/* Page Program settings */
+	u32				wr_modes;
+	u8				page_programs[SNOR_PINDEX_MAX];
+
+	/* Sector Erase settings */
+	struct spi_nor_erase_type	erase_types[SNOR_MAX_ERASE_TYPES];
+
+	int (*enable_quad_io)(struct spi_nor *nor);
+};
+
+
+#define SNOR_PROTO_CODE_OFF	8
+#define SNOR_PROTO_CODE_MASK	GENMASK(11, 8)
+#define SNOR_PROTO_CODE_TO_PROTO(code) \
+	(((code) << SNOR_PROTO_CODE_OFF) & SNOR_PROTO_CODE_MASK)
+#define SNOR_PROTO_CODE_FROM_PROTO(proto) \
+	((((u32)(proto)) & SNOR_PROTO_CODE_MASK) >> SNOR_PROTO_CODE_OFF)
+
+#define SNOR_PROTO_ADDR_OFF	4
+#define SNOR_PROTO_ADDR_MASK	GENMASK(7, 4)
+#define SNOR_PROTO_ADDR_TO_PROTO(addr) \
+	(((addr) << SNOR_PROTO_ADDR_OFF) & SNOR_PROTO_ADDR_MASK)
+#define SNOR_PROTO_ADDR_FROM_PROTO(proto) \
+	((((u32)(proto)) & SNOR_PROTO_ADDR_MASK) >> SNOR_PROTO_ADDR_OFF)
+
+#define SNOR_PROTO_DATA_OFF	0
+#define SNOR_PROTO_DATA_MASK	GENMASK(3, 0)
+#define SNOR_PROTO_DATA_TO_PROTO(data) \
+	(((data) << SNOR_PROTO_DATA_OFF) & SNOR_PROTO_DATA_MASK)
+#define SNOR_PROTO_DATA_FROM_PROTO(proto) \
+	((((u32)(proto)) & SNOR_PROTO_DATA_MASK) >> SNOR_PROTO_DATA_OFF)
+
+#define SNOR_PROTO(code, addr, data)	  \
+	(SNOR_PROTO_CODE_TO_PROTO(code) |   \
+	 SNOR_PROTO_ADDR_TO_PROTO(addr) | \
+	 SNOR_PROTO_DATA_TO_PROTO(data))
+
+enum spi_nor_protocol {
+	SNOR_PROTO_1_1_1 = SNOR_PROTO(1, 1, 1),	/* SPI */
+	SNOR_PROTO_1_1_2 = SNOR_PROTO(1, 1, 2),	/* Dual Output */
+	SNOR_PROTO_1_1_4 = SNOR_PROTO(1, 1, 4),	/* Quad Output */
+	SNOR_PROTO_1_2_2 = SNOR_PROTO(1, 2, 2),	/* Dual IO */
+	SNOR_PROTO_1_4_4 = SNOR_PROTO(1, 4, 4),	/* Quad IO */
+	SNOR_PROTO_2_2_2 = SNOR_PROTO(2, 2, 2),	/* Dual Command */
+	SNOR_PROTO_4_4_4 = SNOR_PROTO(4, 4, 4),	/* Quad Command */
 };
 
 #define SPI_NOR_MAX_CMD_SIZE	8
@@ -142,9 +255,11 @@ enum spi_nor_option_flags {
  * @read_opcode:	the read opcode
  * @read_dummy:		the dummy needed by the read operation
  * @program_opcode:	the program opcode
- * @flash_read:		the mode of the read
  * @sst_write_second:	used by the SST write operation
  * @flags:		flag options for the current SPI-NOR (SNOR_F_*)
+ * @read_proto:		the SPI protocol used by read operations
+ * @write_proto:	the SPI protocol used by write operations
+ * @reg_proto		the SPI protocol used by read_reg/write_reg operations
  * @cmd_buf:		used by the write_reg
  * @prepare:		[OPTIONAL] do some preparations for the
  *			read/write/erase/lock/unlock operations
@@ -173,7 +288,9 @@ struct spi_nor {
 	u8			read_opcode;
 	u8			read_dummy;
 	u8			program_opcode;
-	enum read_mode		flash_read;
+	enum spi_nor_protocol	read_proto;
+	enum spi_nor_protocol	write_proto;
+	enum spi_nor_protocol	reg_proto;
 	bool			sst_write_second;
 	u32			flags;
 	u8			cmd_buf[SPI_NOR_MAX_CMD_SIZE];
@@ -211,7 +328,7 @@ static inline struct device_node *spi_nor_get_flash_node(struct spi_nor *nor)
  * spi_nor_scan() - scan the SPI NOR
  * @nor:	the spi_nor structure
  * @name:	the chip type name
- * @mode:	the read mode supported by the driver
+ * @modes:	the SPI modes supported by the controller driver
  *
  * The drivers can use this fuction to scan the SPI NOR.
  * In the scanning, it will try to get all the necessary information to
@@ -221,6 +338,7 @@ static inline struct device_node *spi_nor_get_flash_node(struct spi_nor *nor)
  *
  * Return: 0 for success, others for failure.
  */
-int spi_nor_scan(struct spi_nor *nor, const char *name, enum read_mode mode);
+int spi_nor_scan(struct spi_nor *nor, const char *name,
+		 const struct spi_nor_modes *modes);
 
 #endif
-- 
2.7.4

[PATCH v3 4/9] mtd: spi-nor: remove unused set_quad_mode() function

[Cyrille Pitchen]

The set_quad_mode() function is no longer used, so we remove it.

This patch is not squashed into the previous patch on purpose for
readiness issue and to ease the review process of the whole series.

Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
---
 drivers/mtd/spi-nor/spi-nor.c | 24 ------------------------
 1 file changed, 24 deletions(-)

diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index 05000b010e7f..a06fcf400b39 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -1331,30 +1331,6 @@ static int spansion_quad_enable(struct spi_nor *nor)
 	return 0;
 }
 
-static int set_quad_mode(struct spi_nor *nor, const struct flash_info *info)
-{
-	int status;
-
-	switch (JEDEC_MFR(info)) {
-	case SNOR_MFR_MACRONIX:
-		status = macronix_quad_enable(nor);
-		if (status) {
-			dev_err(nor->dev, "Macronix quad-read not enabled\n");
-			return -EINVAL;
-		}
-		return status;
-	case SNOR_MFR_MICRON:
-		return 0;
-	default:
-		status = spansion_quad_enable(nor);
-		if (status) {
-			dev_err(nor->dev, "Spansion quad-read not enabled\n");
-			return -EINVAL;
-		}
-		return status;
-	}
-}
-
 static int spi_nor_check(struct spi_nor *nor)
 {
 	if (!nor->dev || !nor->read || !nor->write ||
-- 
2.7.4

[PATCH v3 5/9] mtd: m25p80: add support of dual and quad spi protocols to all commands

[Cyrille Pitchen]

Before this patch, m25p80_read() supported few SPI protocols:
- regular SPI 1-1-1
- SPI Dual Output 1-1-2
- SPI Quad Output 1-1-4
On the other hand, all other m25p80_*() hooks only supported SPI 1-1-1.

This patch adds support to all currently existing SPI protocols to
cover as many protocols as possible.

Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
---
 drivers/mtd/devices/m25p80.c | 193 +++++++++++++++++++++++++++++++++----------
 1 file changed, 149 insertions(+), 44 deletions(-)

diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
index f0a55c01406b..38778eac6c21 100644
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -27,22 +27,64 @@
 #include <linux/spi/flash.h>
 #include <linux/mtd/spi-nor.h>
 
-#define	MAX_CMD_SIZE		6
+#define	MAX_CMD_SIZE		16
 struct m25p {
 	struct spi_device	*spi;
 	struct spi_nor		spi_nor;
 	u8			command[MAX_CMD_SIZE];
 };
 
+static inline int m25p80_proto2nbits(enum spi_nor_protocol proto,
+				     unsigned *code_nbits,
+				     unsigned *addr_nbits,
+				     unsigned *data_nbits)
+{
+	if (code_nbits)
+		*code_nbits = SNOR_PROTO_CODE_FROM_PROTO(proto);
+	if (addr_nbits)
+		*addr_nbits = SNOR_PROTO_ADDR_FROM_PROTO(proto);
+	if (data_nbits)
+		*data_nbits = SNOR_PROTO_DATA_FROM_PROTO(proto);
+
+	return 0;
+}
+
 static int m25p80_read_reg(struct spi_nor *nor, u8 code, u8 *val, int len)
 {
 	struct m25p *flash = nor->priv;
 	struct spi_device *spi = flash->spi;
+	unsigned code_nbits, data_nbits;
+	struct spi_transfer xfers[2];
 	int ret;
 
-	ret = spi_write_then_read(spi, &code, 1, val, len);
+	/* Check the total length of command op code and data. */
+	if (len + 1 > MAX_CMD_SIZE)
+		return -EINVAL;
+
+	/* Get transfer protocols (addr_nbits is not relevant here). */
+	ret = m25p80_proto2nbits(nor->reg_proto,
+				 &code_nbits, NULL, &data_nbits);
+	if (ret < 0)
+		return ret;
+
+	/* Set up transfers. */
+	memset(xfers, 0, sizeof(xfers));
+
+	flash->command[0] = code;
+	xfers[0].len = 1;
+	xfers[0].tx_buf = flash->command;
+	xfers[0].tx_nbits = code_nbits;
+
+	xfers[1].len = len;
+	xfers[1].rx_buf = &flash->command[1];
+	xfers[1].rx_nbits = data_nbits;
+
+	/* Process command. */
+	ret = spi_sync_transfer(spi, xfers, 2);
 	if (ret < 0)
 		dev_err(&spi->dev, "error %d reading %x\n", ret, code);
+	else
+		memcpy(val, &flash->command[1], len);
 
 	return ret;
 }
@@ -65,12 +107,42 @@ static int m25p80_write_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
 {
 	struct m25p *flash = nor->priv;
 	struct spi_device *spi = flash->spi;
+	unsigned code_nbits, data_nbits, num_xfers = 1;
+	struct spi_transfer xfers[2];
+	int ret;
+
+	/* Check the total length of command op code and data. */
+	if (buf && (len + 1 > MAX_CMD_SIZE))
+		return -EINVAL;
+
+	/* Get transfer protocols (addr_nbits is not relevant here). */
+	ret = m25p80_proto2nbits(nor->reg_proto,
+				 &code_nbits, NULL, &data_nbits);
+	if (ret < 0)
+		return ret;
+
+	/* Set up transfer(s). */
+	memset(xfers, 0, sizeof(xfers));
 
 	flash->command[0] = opcode;
-	if (buf)
+	xfers[0].len = 1;
+	xfers[0].tx_buf = flash->command;
+	xfers[0].tx_nbits = code_nbits;
+
+	if (buf) {
 		memcpy(&flash->command[1], buf, len);
+		if (data_nbits == code_nbits) {
+			xfers[0].len += len;
+		} else {
+			xfers[1].len = len;
+			xfers[1].tx_buf = &flash->command[1];
+			xfers[1].tx_nbits = data_nbits;
+			num_xfers++;
+		}
+	}
 
-	return spi_write(spi, flash->command, len + 1);
+	/* Process command. */
+	return spi_sync_transfer(spi, xfers, num_xfers);
 }
 
 static ssize_t m25p80_write(struct spi_nor *nor, loff_t to, size_t len,
@@ -78,27 +150,48 @@ static ssize_t m25p80_write(struct spi_nor *nor, loff_t to, size_t len,
 {
 	struct m25p *flash = nor->priv;
 	struct spi_device *spi = flash->spi;
-	struct spi_transfer t[2] = {};
+	unsigned code_nbits, addr_nbits, data_nbits, num_xfers = 1;
+	struct spi_transfer xfers[3];
 	struct spi_message m;
 	int cmd_sz = m25p_cmdsz(nor);
 	ssize_t ret;
 
-	spi_message_init(&m);
-
 	if (nor->program_opcode == SPINOR_OP_AAI_WP && nor->sst_write_second)
 		cmd_sz = 1;
 
-	flash->command[0] = nor->program_opcode;
-	m25p_addr2cmd(nor, to, flash->command);
+	/* Get transfer protocols. */
+	ret = m25p80_proto2nbits(nor->write_proto,
+				 &code_nbits, &addr_nbits, &data_nbits);
+	if (ret < 0)
+		return ret;
 
-	t[0].tx_buf = flash->command;
-	t[0].len = cmd_sz;
-	spi_message_add_tail(&t[0], &m);
+	/* Set up transfers. */
+	memset(xfers, 0, sizeof(xfers));
+
+	flash->command[0] = nor->program_opcode;
+	xfers[0].len = 1;
+	xfers[0].tx_buf = flash->command;
+	xfers[0].tx_nbits = code_nbits;
+
+	if (cmd_sz > 1) {
+		m25p_addr2cmd(nor, to, flash->command);
+		if (addr_nbits == code_nbits) {
+			xfers[0].len += nor->addr_width;
+		} else {
+			xfers[1].len = nor->addr_width;
+			xfers[1].tx_buf = &flash->command[1];
+			xfers[1].tx_nbits = addr_nbits;
+			num_xfers++;
+		}
+	}
 
-	t[1].tx_buf = buf;
-	t[1].len = len;
-	spi_message_add_tail(&t[1], &m);
+	xfers[num_xfers].len = len;
+	xfers[num_xfers].tx_buf = buf;
+	xfers[num_xfers].tx_nbits = data_nbits;
+	num_xfers++;
 
+	/* Process command. */
+	spi_message_init_with_transfers(&m, xfers, num_xfers);
 	ret = spi_sync(spi, &m);
 	if (ret)
 		return ret;
@@ -109,18 +202,6 @@ static ssize_t m25p80_write(struct spi_nor *nor, loff_t to, size_t len,
 	return ret;
 }
 
-static inline unsigned int m25p80_rx_nbits(struct spi_nor *nor)
-{
-	switch (SNOR_PROTO_DATA_FROM_PROTO(nor->read_proto)) {
-	case 2:
-		return 2;
-	case 4:
-		return 4;
-	default:
-		return 0;
-	}
-}
-
 /*
  * Read an address range from the nor chip.  The address range
  * may be any size provided it is within the physical boundaries.
@@ -130,14 +211,22 @@ static ssize_t m25p80_read(struct spi_nor *nor, loff_t from, size_t len,
 {
 	struct m25p *flash = nor->priv;
 	struct spi_device *spi = flash->spi;
-	struct spi_transfer t[2];
-	struct spi_message m;
+	unsigned code_nbits, addr_nbits, data_nbits, num_xfers = 1;
 	unsigned int dummy = nor->read_dummy;
 	ssize_t ret;
+	struct spi_transfer xfers[3];
+	struct spi_message m;
+
+	/* Get transfer protocols. */
+	ret = m25p80_proto2nbits(nor->read_proto,
+				 &code_nbits, &addr_nbits, &data_nbits);
+	if (ret < 0)
+		return ret;
 
 	/* convert the dummy cycles to the number of bytes */
-	dummy /= 8;
+	dummy = (dummy * addr_nbits) / 8;
 
+	/* Use the SPI flash API if supported. */
 	if (spi_flash_read_supported(spi)) {
 		struct spi_flash_read_message msg;
 
@@ -149,10 +238,9 @@ static ssize_t m25p80_read(struct spi_nor *nor, loff_t from, size_t len,
 		msg.read_opcode = nor->read_opcode;
 		msg.addr_width = nor->addr_width;
 		msg.dummy_bytes = dummy;
-		/* TODO: Support other combinations */
-		msg.opcode_nbits = SPI_NBITS_SINGLE;
-		msg.addr_nbits = SPI_NBITS_SINGLE;
-		msg.data_nbits = m25p80_rx_nbits(nor);
+		msg.opcode_nbits = code_nbits;
+		msg.addr_nbits = addr_nbits;
+		msg.data_nbits = data_nbits;
 
 		ret = spi_flash_read(spi, &msg);
 		if (ret < 0)
@@ -160,21 +248,38 @@ static ssize_t m25p80_read(struct spi_nor *nor, loff_t from, size_t len,
 		return msg.retlen;
 	}
 
-	spi_message_init(&m);
-	memset(t, 0, (sizeof t));
+	/* Set up transfers. */
+	memset(xfers, 0, sizeof(xfers));
 
 	flash->command[0] = nor->read_opcode;
-	m25p_addr2cmd(nor, from, flash->command);
+	xfers[0].len = 1;
+	xfers[0].tx_buf = flash->command;
+	xfers[0].tx_nbits = code_nbits;
 
-	t[0].tx_buf = flash->command;
-	t[0].len = m25p_cmdsz(nor) + dummy;
-	spi_message_add_tail(&t[0], &m);
+	m25p_addr2cmd(nor, from, flash->command);
+	/*
+	 * Clear all dummy/mode cycle bits to avoid sending some manufacturer
+	 * specific pattern, which might make the memory enter its Continuous
+	 * Read mode by mistake.
+	 */
+	memset(flash->command + 1 + nor->addr_width, 0, dummy);
+
+	if (addr_nbits == code_nbits) {
+		xfers[0].len += nor->addr_width + dummy;
+	} else {
+		xfers[1].len = nor->addr_width + dummy;
+		xfers[1].tx_buf = &flash->command[1];
+		xfers[1].tx_nbits = addr_nbits;
+		num_xfers++;
+	}
 
-	t[1].rx_buf = buf;
-	t[1].rx_nbits = m25p80_rx_nbits(nor);
-	t[1].len = min(len, spi_max_transfer_size(spi));
-	spi_message_add_tail(&t[1], &m);
+	xfers[num_xfers].len = len;
+	xfers[num_xfers].rx_buf = buf;
+	xfers[num_xfers].rx_nbits = data_nbits;
+	num_xfers++;
 
+	/* Process command. */
+	spi_message_init_with_transfers(&m, xfers, num_xfers);
 	ret = spi_sync(spi, &m);
 	if (ret)
 		return ret;
-- 
2.7.4

[PATCH v3 6/9] mtd: spi-nor: parse Serial Flash Discoverable Parameters (SFDP) tables

[Cyrille Pitchen]

This patch adds support the the JESD216B standard and parse the SFDP
tables to dynamically initialize the spi_nor_basic_flash_parameter
structure.

Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
---
 drivers/mtd/spi-nor/spi-nor.c | 468 +++++++++++++++++++++++++++++++++++++++++-
 include/linux/mtd/spi-nor.h   |   6 +
 2 files changed, 473 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index a06fcf400b39..7fc0138c1d68 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -17,6 +17,7 @@
 #include <linux/mutex.h>
 #include <linux/math64.h>
 #include <linux/sizes.h>
+#include <linux/slab.h>
 
 #include <linux/mtd/mtd.h>
 #include <linux/of_platform.h>
@@ -79,6 +80,7 @@ struct flash_info {
 					 * Use dedicated 4byte address op codes
 					 * to support memory size above 128Mib.
 					 */
+#define SPI_NOR_SKIP_SFDP	BIT(11) /* Skip read of SFDP tables */
 };
 
 #define JEDEC_MFR(info)	((info)->id[0])
@@ -1331,6 +1333,99 @@ static int spansion_quad_enable(struct spi_nor *nor)
 	return 0;
 }
 
+static int spansion_new_quad_enable(struct spi_nor *nor)
+{
+	u8 sr_cr[2];
+	int ret;
+
+	/* Check current Quad Enable bit value. */
+	ret = read_cr(nor);
+	if (ret < 0) {
+		dev_err(nor->dev,
+			"error while reading configuration register\n");
+		return -EINVAL;
+	}
+	sr_cr[1] = ret;
+	if (sr_cr[1] & CR_QUAD_EN_SPAN)
+		return 0;
+
+	dev_info(nor->dev, "setting Spansion Quad Enable (non-volatile) bit\n");
+
+	/* Keep the current value of the Status Register. */
+	ret = read_sr(nor);
+	if (ret < 0) {
+		dev_err(nor->dev,
+			"error while reading status register\n");
+		return -EINVAL;
+	}
+	sr_cr[0] = ret;
+	sr_cr[1] |= CR_QUAD_EN_SPAN;
+
+	write_enable(nor);
+
+	ret = nor->write_reg(nor, SPINOR_OP_WRSR, sr_cr, 2);
+	if (ret < 0) {
+		dev_err(nor->dev,
+			"error while writing configuration register\n");
+		return -EINVAL;
+	}
+
+	ret = spi_nor_wait_till_ready(nor);
+	if (ret < 0) {
+		dev_err(nor->dev, "error while waiting for WRSR completion\n");
+		return ret;
+	}
+
+	/* read back and check it */
+	ret = read_cr(nor);
+	if (!(ret > 0 && (ret & CR_QUAD_EN_SPAN))) {
+		dev_err(nor->dev, "Spansion Quad bit not set\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int sr2_bit7_quad_enable(struct spi_nor *nor)
+{
+	u8 sr2;
+	int ret;
+
+	/* Check current Quad Enable bit value. */
+	ret = nor->read_reg(nor, SPINOR_OP_RDSR2, &sr2, 1);
+	if (ret)
+		return ret;
+	if (sr2 & SR2_QUAD_EN_BIT7)
+		return 0;
+
+	/* Update the Quad Enable bit. */
+	sr2 |= SR2_QUAD_EN_BIT7;
+
+	write_enable(nor);
+
+	ret = nor->write_reg(nor, SPINOR_OP_WRSR2, &sr2, 1);
+	if (ret < 0) {
+		dev_err(nor->dev,
+			"error while writing status register 2\n");
+		return -EINVAL;
+	}
+
+	ret = spi_nor_wait_till_ready(nor);
+	if (ret < 0) {
+		dev_err(nor->dev, "error while waiting for WRSR2 completion\n");
+		return ret;
+	}
+
+	/* Read back and check it. */
+	ret = nor->read_reg(nor, SPINOR_OP_RDSR2, &sr2, 1);
+	if (ret || !(sr2 & SR2_QUAD_EN_BIT7)) {
+		dev_err(nor->dev, "SR2 Quad bit not set\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 static int spi_nor_check(struct spi_nor *nor)
 {
 	if (!nor->dev || !nor->read || !nor->write ||
@@ -1359,11 +1454,381 @@ static inline void spi_nor_set_erase_settings(struct spi_nor_erase_type *erase,
 	erase->opcode = opcode;
 }
 
+static int spi_nor_read_sfdp(struct spi_nor *nor, u32 addr,
+			     size_t len, void *buf)
+{
+	u8 addr_width, read_opcode, read_dummy;
+	int ret;
+
+	read_opcode = nor->read_opcode;
+	addr_width = nor->addr_width;
+	read_dummy = nor->read_dummy;
+
+	nor->read_opcode = SPINOR_OP_RDSFDP;
+	nor->addr_width = 3;
+	nor->read_dummy = 8;
+
+	ret = nor->read(nor, addr, len, (u8 *)buf);
+
+	nor->read_opcode = read_opcode;
+	nor->addr_width = addr_width;
+	nor->read_dummy = read_dummy;
+
+	return (ret < 0) ? ret : 0;
+}
+
+struct sfdp_parameter_header {
+	u8		id_lsb;
+	u8		minor;
+	u8		major;
+	u8		length; /* in double words */
+	u8		parameter_table_pointer[3]; /* byte address */
+	u8		id_msb;
+};
+
+#define SFDP_PARAM_HEADER_ID(p)	((u16)(((p)->id_msb << 8) | (p)->id_lsb))
+#define SFDP_PARAM_HEADER_PTP(p) \
+	((u32)(((p)->parameter_table_pointer[2] << 16) | \
+	       ((p)->parameter_table_pointer[1] <<  8) | \
+	       ((p)->parameter_table_pointer[0] <<  0)))
+
+
+#define SFDP_BFPT_ID		0xff00u	/* Basic Flash Parameter Table */
+
+#define SFDP_SIGNATURE		0x50444653u
+#define SFDP_JESD216_MAJOR	1
+#define SFDP_JESD216_MINOR	0
+#define SFDP_JESD216A_MINOR	5
+#define SFDP_JESD216B_MINOR	6
+
+struct sfdp_header {
+	u32		signature; /* Ox50444653 <=> "SFDP" */
+	u8		minor;
+	u8		major;
+	u8		nph; /* 0-base number of parameter headers */
+	u8		unused;
+
+	/* Basic Flash Parameter Table. */
+	struct sfdp_parameter_header	bfpt_header;
+};
+
+/* Basic Flash Parameter Table */
+
+/* 1st DWORD. */
+#define BFPT_WORD0_FAST_READ_1_1_2	BIT(16)
+#define BFPT_WORD0_ADDRESS_BYTES_MASK	GENMASK(18, 17)
+#define BFPT_WORD0_ADDRESS_BYTES_3_ONLY	(0u << 17)
+#define BFPT_WORD0_ADDRESS_BYTES_3_OR_4	(1u << 17)
+#define BFPT_WORD0_ADDRESS_BYTES_4_ONLY	(2u << 17)
+#define BFPT_WORD0_DTR			BIT(19)
+#define BFPT_WORD0_FAST_READ_1_2_2	BIT(20)
+#define BFPT_WORD0_FAST_READ_1_4_4	BIT(21)
+#define BFPT_WORD0_FAST_READ_1_1_4	BIT(22)
+
+/* 15th DWORD. */
+
+/*
+ * (from JESD216B)
+ * Quad Enable Requirements (QER):
+ * - 000b: Device does not have a QE bit. Device detects 1-1-4 and 1-4-4
+ *         reads based on instruction. DQ3/HOLD# functions are hold during
+ *         instruction pahse.
+ * - 001b: QE is bit 1 of status register 2. It is set via Write Status with
+ *         two data bytes where bit 1 of the second byte is one.
+ *         [...]
+ *         Writing only one byte to the status register has the side-effect of
+ *         clearing status register 2, including the QE bit. The 100b code is
+ *         used if writing one byte to the status register does not modify
+ *         status register 2.
+ * - 010b: QE is bit 6 of status register 1. It is set via Write Status with
+ *         one data byte where bit 6 is one.
+ *         [...]
+ * - 011b: QE is bit 7 of status register 2. It is set via Write status
+ *         register 2 instruction 3Eh with one data byte where bit 7 is one.
+ *         [...]
+ *         The status register 2 is read using instruction 3Fh.
+ * - 100b: QE is bit 1 of status register 2. It is set via Write Status with
+ *         two data bytes where bit 1 of the second byte is one.
+ *         [...]
+ *         In contrast to the 001b code, writing one byte to the status
+ *         register does not modify status register 2.
+ * - 101b: QE is bit 1 of status register 2. Status register 1 is read using
+ *         Read Status instruction 05h. Status register2 is read using
+ *         instruction 35h. QE is set via Writ Status instruction 01h with
+ *         two data bytes where bit 1 of the second byte is one.
+ *         [...]
+ */
+#define BFPT_WORD14_QER_MASK		GENMASK(22, 20)
+#define BFPT_WORD14_QER_NONE		(0 << 20) /* Micron */
+#define BFPT_WORD14_QER_SR2_BIT1_BUGGY	(1 << 20)
+#define BFPT_WORD14_QER_SR1_BIT6	(2 << 20) /* Macronix */
+#define BFPT_WORD14_QER_SR2_BIT7	(3 << 20)
+#define BFPT_WORD14_QER_SR2_BIT1_NO_RD	(4 << 20)
+#define BFPT_WORD14_QER_SR2_BIT1	(5 << 20) /* Spansion */
+
+/* JESD216B defines a Basic Flash Parameter Table of 16 words. */
+#define SFDP_BFPT_MAX_WORDS	16
+
+struct sfdp_bfpt {
+	u32	word[SFDP_BFPT_MAX_WORDS];
+};
+
+/* Fast Read settings. */
+#define BFPT_FAST_READ_WAIT_STATES(half)	((((u16)(half)) >> 0) & 0x1f)
+#define BFPT_FAST_READ_MODE_CLOCKS(half)	((((u16)(half)) >> 5) & 0x07)
+#define BFPT_FAST_READ_OP_CODE(half)		((((u16)(half)) >> 8) & 0xff)
+
+struct sfdp_read {
+	/* The protocol index of SPI x-y-z. */
+	enum spi_nor_protocol_index	pindex;
+
+	/*
+	 * The bit <wbit> in DWORD<windex> tells us whether the
+	 * Fast Read x-y-z command is supported.
+	 */
+	int				windex;
+	int				wbit;
+
+	/*
+	 * The half-word at offset <hshift> in DWORD<hindex> encodes the
+	 * op code, the number of mode clocks and the number of wait states
+	 * to be used by Fast Read x-y-z commands.
+	 */
+	int				hindex;
+	int				hshift;
+};
+
+static const struct sfdp_read sfdp_reads[] = {
+	/* Supported: DWORD0 bit 16,  Settings: DWORD3 bit[15:0] */
+	{SNOR_PINDEX_1_1_2, 0, 16, 3,  0},
+
+	/* Supported: DWORD0 bit 20,  Settings: DWORD3 bit[31:16] */
+	{SNOR_PINDEX_1_2_2, 0, 20, 3, 16},
+
+	/* Supported: DWORD4 bit  0,  Settings: DWORD5 bit[31:16] */
+	{SNOR_PINDEX_2_2_2, 4,  0, 5, 16},
+
+	/* Supported: DWORD0 bit 22,  Settings: DWORD2 bit[31:16] */
+	{SNOR_PINDEX_1_1_4, 0, 22, 2, 16},
+
+	/* Supported: DWORD0 bit 21,  Settings: DWORD2 bit[15:0] */
+	{SNOR_PINDEX_1_4_4, 0, 21, 2, 0},
+
+	/* Supported: DWORD4 bit  4,  Settings: DWORD6 bit[31:16] */
+	{SNOR_PINDEX_4_4_4, 4, 4, 6, 16},
+};
+
+
+/* Sector Erase settings. */
+#define BFPT_ERASE_SIZE(half)		((((u16)(half)) >> 0) & 0xff)
+#define BFPT_ERASE_OP_CODE(half)	((((u16)(half)) >> 8) & 0xff)
+
+struct sfdp_erase {
+	/*
+	 * The half-word at offset <hshift> in DWORD<hindex> encodes the
+	 * op code and erase sector size to be used by Sector Erase commands.
+	 */
+	int		hindex;
+	int		hshift;
+};
+
+static const struct sfdp_erase sfdp_erases[SNOR_MAX_ERASE_TYPES] = {
+	/* Erase Type 1 in DWORD7 bits[15:0] */
+	{7, 0},
+
+	/* Erase Type 2 in DWORD7 bits[31:16] */
+	{7, 16},
+
+	/* Erase Type 3 in DWORD8 bits[15:0] */
+	{8, 0},
+
+	/* Erase Type 4: in DWORD8 bits[31:16] */
+	{8, 16},
+};
+
+
+static int spi_nor_parse_bfpt(struct spi_nor *nor,
+			      const struct sfdp_parameter_header *bfpt_header,
+			      struct spi_nor_basic_flash_parameter *params)
+{
+	struct sfdp_bfpt bfpt;
+	size_t len;
+	int i, err;
+	u32 addr;
+	u16 half;
+
+	/* JESD216 Basic Flash Parameter Table length is at least 9 words. */
+	if (bfpt_header->length < 9)
+		return -EINVAL;
+
+	/* Read the Basic Flash Parameter Table. */
+	len = min_t(size_t, sizeof(bfpt),
+		    bfpt_header->length * sizeof(uint32_t));
+	addr = SFDP_PARAM_HEADER_PTP(bfpt_header);
+	memset(&bfpt, 0, sizeof(bfpt));
+	err = spi_nor_read_sfdp(nor,  addr, len, &bfpt);
+	if (err)
+		return err;
+
+	for (i = 0; i < SFDP_BFPT_MAX_WORDS; ++i)
+		bfpt.word[i] = le32_to_cpu(bfpt.word[i]);
+
+	memset(params, 0, sizeof(*params));
+
+	/* Fast Read settings. */
+	params->rd_modes = (SNOR_MODE_SLOW | SNOR_MODE_1_1_1);
+	spi_nor_set_read_settings(&params->reads[SNOR_PINDEX_SLOW],
+				  0, 0, SPINOR_OP_READ);
+	spi_nor_set_read_settings(&params->reads[SNOR_PINDEX_1_1_1],
+				  0, 8, SPINOR_OP_READ_FAST);
+
+	for (i = 0; i < ARRAY_SIZE(sfdp_reads); ++i) {
+		const struct sfdp_read *rd_info = &sfdp_reads[i];
+		struct spi_nor_read *read = &params->reads[rd_info->pindex];
+
+		if (!(bfpt.word[rd_info->windex] & BIT(rd_info->wbit)))
+			continue;
+
+		params->rd_modes |= BIT(rd_info->pindex);
+		half = bfpt.word[rd_info->hindex] >> rd_info->hshift;
+		read->num_mode_clocks = BFPT_FAST_READ_MODE_CLOCKS(half);
+		read->num_wait_states = BFPT_FAST_READ_WAIT_STATES(half);
+		read->opcode = BFPT_FAST_READ_OP_CODE(half);
+	}
+
+	/* Page Program settings. */
+	params->wr_modes = SNOR_MODE_1_1_1;
+	params->page_programs[SNOR_PINDEX_1_1_1] = SPINOR_OP_PP;
+
+	/* Sector Erase settings. */
+	for (i = 0; i < SNOR_MAX_ERASE_TYPES; ++i) {
+		const struct sfdp_erase *er_info = &sfdp_erases[i];
+		struct spi_nor_erase_type *erase = &params->erase_types[i];
+
+		half = bfpt.word[er_info->hindex] >> er_info->hshift;
+		erase->size = BFPT_ERASE_SIZE(half);
+		erase->opcode = BFPT_ERASE_OP_CODE(half);
+	}
+
+	/* Stop here if not JESD216 rev A or later. */
+	if (bfpt_header->length < 15)
+		return 0;
+
+	/* Enable Quad I/O. */
+	switch (bfpt.word[14] & BFPT_WORD14_QER_MASK) {
+	default:
+	case BFPT_WORD14_QER_NONE:
+		break;
+
+	case BFPT_WORD14_QER_SR2_BIT1_BUGGY:
+	case BFPT_WORD14_QER_SR2_BIT1_NO_RD:
+		params->enable_quad_io = spansion_quad_enable;
+		break;
+
+	case BFPT_WORD14_QER_SR1_BIT6:
+		params->enable_quad_io = macronix_quad_enable;
+		break;
+
+	case BFPT_WORD14_QER_SR2_BIT7:
+		params->enable_quad_io = sr2_bit7_quad_enable;
+		break;
+
+	case BFPT_WORD14_QER_SR2_BIT1:
+		params->enable_quad_io = spansion_new_quad_enable;
+		break;
+	}
+
+	return 0;
+}
+
+static int spi_nor_parse_sfdp(struct spi_nor *nor,
+			      struct spi_nor_basic_flash_parameter *params)
+{
+	const struct sfdp_parameter_header *param_header, *bfpt_header;
+	struct sfdp_parameter_header *param_headers = NULL;
+	struct sfdp_header header;
+	size_t psize;
+	int i, err;
+
+	/* Get the SFDP header. */
+	err = spi_nor_read_sfdp(nor, 0, sizeof(header), &header);
+	if (err)
+		return err;
+
+	/* Check the SFDP header version. */
+	if (le32_to_cpu(header.signature) != SFDP_SIGNATURE ||
+	    header.major != SFDP_JESD216_MAJOR ||
+	    header.minor < SFDP_JESD216_MINOR)
+		return -EINVAL;
+
+	/*
+	 * Verify that the first and only mandatory parameter header is a
+	 * Basic Flash Parameter Table header as specified in JESD216.
+	 */
+	bfpt_header = &header.bfpt_header;
+	if (SFDP_PARAM_HEADER_ID(bfpt_header) != SFDP_BFPT_ID ||
+	    bfpt_header->major != SFDP_JESD216_MAJOR)
+		return -EINVAL;
+
+	/* Allocate memory for parameter headers. */
+	if (header.nph) {
+		psize = header.nph * sizeof(*param_headers);
+
+		param_headers = kmalloc(psize, GFP_KERNEL);
+		if (!param_headers) {
+			dev_err(nor->dev,
+				"failed to allocate memory for SFDP parameter headers\n");
+			return -ENOMEM;
+		}
+
+		err = spi_nor_read_sfdp(nor, sizeof(header),
+					psize, param_headers);
+		if (err) {
+			dev_err(nor->dev,
+				"failed to read SFDP parameter headers\n");
+			goto exit;
+		}
+	}
+
+	/*
+	 * Check other parameter headers to get the latest revision of
+	 * the basic flash parameter table.
+	 */
+	for (i = 0; i < header.nph; ++i) {
+		param_header = &param_headers[i];
+
+		if (SFDP_PARAM_HEADER_ID(param_header) == SFDP_BFPT_ID &&
+		    param_header->major == SFDP_JESD216_MAJOR &&
+		    (param_header->minor > bfpt_header->minor ||
+		     (param_header->minor == bfpt_header->minor &&
+		      param_header->length > bfpt_header->length)))
+			bfpt_header = param_header;
+	}
+	err = spi_nor_parse_bfpt(nor, bfpt_header, params);
+	if (err)
+		goto exit;
+
+exit:
+	kfree(param_headers);
+	return (err) ? err : bfpt_header->minor;
+}
+
 static int spi_nor_init_params(struct spi_nor *nor,
 			       const struct flash_info *info,
 			       struct spi_nor_basic_flash_parameter *params)
 {
-	// TODO: parse SFDP table
+	int jesd216_minor = -EINVAL;
+
+	/* First trying to parse SFDP tables. */
+	if (!(info->flags & SPI_NOR_SKIP_SFDP)) {
+		jesd216_minor = spi_nor_parse_sfdp(nor, params);
+
+		if (jesd216_minor >= SFDP_JESD216A_MINOR)
+			return 0;
+
+		if (jesd216_minor >= SFDP_JESD216_MINOR)
+			goto set_enable_quad_io;
+	}
 
 	/* If SFDP tables are not available, use legacy settings. */
 	memset(params, 0, sizeof(*params));
@@ -1402,6 +1867,7 @@ static int spi_nor_init_params(struct spi_nor *nor,
 		spi_nor_set_erase_settings(&params->erase_types[1],
 					   SNOR_ERASE_4K, SPINOR_OP_BE_4K_PMC);
 
+set_enable_quad_io:
 	/* Select the procedure to set the Quad Enable bit. */
 	if (params->rd_modes & (SNOR_MODE_1_1_4 |
 				SNOR_MODE_1_4_4 |
diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h
index 88ac446b1230..8fd9619dabff 100644
--- a/include/linux/mtd/spi-nor.h
+++ b/include/linux/mtd/spi-nor.h
@@ -41,6 +41,8 @@
 #define SPINOR_OP_WREN		0x06	/* Write enable */
 #define SPINOR_OP_RDSR		0x05	/* Read status register */
 #define SPINOR_OP_WRSR		0x01	/* Write status register 1 byte */
+#define SPINOR_OP_RDSR2		0x3f	/* Read status register 2 */
+#define SPINOR_OP_WRSR2		0x3e	/* Write status register 2 */
 #define SPINOR_OP_READ		0x03	/* Read data bytes (low frequency) */
 #define SPINOR_OP_READ_FAST	0x0b	/* Read data bytes (high frequency) */
 #define SPINOR_OP_READ_1_1_2	0x3b	/* Read data bytes (Dual Output SPI) */
@@ -56,6 +58,7 @@
 #define SPINOR_OP_CHIP_ERASE	0xc7	/* Erase whole flash chip */
 #define SPINOR_OP_SE		0xd8	/* Sector erase (usually 64KiB) */
 #define SPINOR_OP_RDID		0x9f	/* Read JEDEC ID */
+#define SPINOR_OP_RDSFDP	0x5a	/* Read SFDP */
 #define SPINOR_OP_RDCR		0x35	/* Read configuration register */
 #define SPINOR_OP_RDFSR		0x70	/* Read flag status register */
 
@@ -110,6 +113,9 @@
 /* Configuration Register bits. */
 #define CR_QUAD_EN_SPAN		BIT(1)	/* Spansion Quad I/O */
 
+/* Status Register 2 bits. */
+#define SR2_QUAD_EN_BIT7	BIT(7)
+
 
 /* Supported SPI protocols */
 enum spi_nor_protocol_class {
-- 
2.7.4

[PATCH v3 7/9] mtd: spi-nor: parse SFDP 4-byte Address Instruction Table

[Cyrille Pitchen]

This patch adds supports for SFDP (JESD216B) 4-byte Address Instruction
Table. This table is optional but when available, we parse it to get the
4-byte address op codes supported by the memory.
Using these op codes is stateless as opposed to entering the 4-byte
address mode or setting the Base Address Register (BAR).

Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
---
 drivers/mtd/spi-nor/spi-nor.c | 140 +++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 139 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index 7fc0138c1d68..db4874d4af79 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -1494,6 +1494,7 @@ struct sfdp_parameter_header {
 
 
 #define SFDP_BFPT_ID		0xff00u	/* Basic Flash Parameter Table */
+#define SFDP_4BAIT_ID		0xff84u	/* 4-byte Address Instruction Table */
 
 #define SFDP_SIGNATURE		0x50444653u
 #define SFDP_JESD216_MAJOR	1
@@ -1741,6 +1742,124 @@ static int spi_nor_parse_bfpt(struct spi_nor *nor,
 	return 0;
 }
 
+struct sfdp_4bait {
+	enum spi_nor_protocol_index	pindex;
+	int				wbit;
+};
+
+static int spi_nor_parse_4bait(struct spi_nor *nor,
+			       const struct sfdp_parameter_header *param_header,
+			       struct spi_nor_basic_flash_parameter *params)
+{
+	static const struct sfdp_4bait reads[] = {
+		{SNOR_PINDEX_SLOW,  0},	/* 0x13 */
+		{SNOR_PINDEX_1_1_1, 1}, /* 0x0c */
+		{SNOR_PINDEX_1_1_2, 2}, /* 0x3c */
+		{SNOR_PINDEX_1_2_2, 3},	/* 0xbc */
+		{SNOR_PINDEX_1_1_4, 4},	/* 0x6c */
+		{SNOR_PINDEX_1_4_4, 5},	/* 0xec */
+	};
+	static const struct sfdp_4bait programs[] = {
+		{SNOR_PINDEX_1_1_1, 6}, /* 0x12 */
+		{SNOR_PINDEX_1_1_4, 7}, /* 0x34 */
+		{SNOR_PINDEX_1_4_4, 8}, /* 0x3e */
+	};
+	static const struct sfdp_4bait erases[SNOR_MAX_ERASE_TYPES] = {
+		{SNOR_PINDEX_1_1_1,  9},
+		{SNOR_PINDEX_1_1_1, 10},
+		{SNOR_PINDEX_1_1_1, 11},
+		{SNOR_PINDEX_1_1_1, 12},
+	};
+	u32 word[2], addr, rd_modes, wr_modes, erase_modes;
+	int i, err;
+
+	if (param_header->major != SFDP_JESD216_MAJOR ||
+	    param_header->length < 2)
+		return -EINVAL;
+
+	/* Read the 4-byte Address Instruction Table. */
+	addr = SFDP_PARAM_HEADER_PTP(param_header);
+	err = spi_nor_read_sfdp(nor, addr, sizeof(word), word);
+	if (err)
+		return err;
+
+	for (i = 0; i < 2; ++i)
+		word[i] = le32_to_cpu(word[i]);
+
+	/*
+	 * Compute the subset of (Fast) Read commands for which the 4-byte
+	 * version is supported.
+	 */
+	rd_modes = 0;
+	for (i = 0; i < ARRAY_SIZE(reads); ++i) {
+		const struct sfdp_4bait *read = &reads[i];
+
+		if ((params->rd_modes & BIT(read->pindex)) &&
+		    (word[0] & BIT(read->wbit)))
+			rd_modes |= BIT(read->pindex);
+	}
+
+	/*
+	 * Compute the subset of Page Program commands for which the 4-byte
+	 * version is supported.
+	 */
+	wr_modes = 0;
+	for (i = 0; i < ARRAY_SIZE(programs); ++i) {
+		const struct sfdp_4bait *program = &programs[i];
+
+		if ((params->wr_modes & BIT(program->pindex)) &&
+		    (word[0] & BIT(program->wbit)))
+			wr_modes |= BIT(program->pindex);
+	}
+
+	/*
+	 * Compute the subet of Sector Erase commands for which the 4-byte
+	 * version is supported.
+	 */
+	erase_modes = 0;
+	for (i = 0; i < SNOR_MAX_ERASE_TYPES; ++i) {
+		const struct sfdp_4bait *erase = &erases[i];
+
+		if ((params->erase_types[i].size > 0) &&
+		    (word[0] & BIT(erase->wbit)))
+			erase_modes |= BIT(i);
+	}
+
+	/*
+	 * We need at least one 4-byte op code per read, program and erase
+	 * operation; the .read(), .write() and .erase() hooks share the
+	 * nor->addr_width value.
+	 */
+	if (!rd_modes || !wr_modes || !erase_modes)
+		return 0;
+
+	/*
+	 * Discard all operations from the 4-byte instruction set which are
+	 * not supported by this memory.
+	 */
+	params->rd_modes = rd_modes;
+	params->wr_modes = wr_modes;
+	for (i = 0; i < SNOR_MAX_ERASE_TYPES; ++i)
+		if (!(erase_modes & BIT(i)))
+			params->erase_types[i].size = 0;
+
+	/* Use the 4-byte address instruction set. */
+	params->reads[SNOR_PINDEX_SLOW].opcode  = SPINOR_OP_READ_4B;
+	params->reads[SNOR_PINDEX_1_1_1].opcode = SPINOR_OP_READ_FAST_4B;
+	params->reads[SNOR_PINDEX_1_1_2].opcode = SPINOR_OP_READ_1_1_2_4B;
+	params->reads[SNOR_PINDEX_1_2_2].opcode = SPINOR_OP_READ_1_2_2_4B;
+	params->reads[SNOR_PINDEX_1_1_4].opcode = SPINOR_OP_READ_1_1_4_4B;
+	params->reads[SNOR_PINDEX_1_4_4].opcode = SPINOR_OP_READ_1_4_4_4B;
+	params->page_programs[SNOR_PINDEX_1_1_1] = SPINOR_OP_PP_4B;
+	params->page_programs[SNOR_PINDEX_1_1_4] = SPINOR_OP_PP_1_1_4_4B;
+	params->page_programs[SNOR_PINDEX_1_4_4] = SPINOR_OP_PP_1_4_4_4B;
+	for (i = 0; i < SNOR_MAX_ERASE_TYPES; ++i)
+		params->erase_types[i].opcode = (word[1] >> (i * 8)) & 0xff;
+
+	nor->addr_width = 4;
+	return 0;
+}
+
 static int spi_nor_parse_sfdp(struct spi_nor *nor,
 			      struct spi_nor_basic_flash_parameter *params)
 {
@@ -1808,6 +1927,23 @@ static int spi_nor_parse_sfdp(struct spi_nor *nor,
 	if (err)
 		goto exit;
 
+	/* Parse other parameter headers. */
+	for (i = 0; i < header.nph; ++i) {
+		param_header = &param_headers[i];
+
+		switch (SFDP_PARAM_HEADER_ID(param_header)) {
+		case SFDP_4BAIT_ID:
+			err = spi_nor_parse_4bait(nor, param_header, params);
+			break;
+
+		default:
+			break;
+		}
+
+		if (err)
+			goto exit;
+	}
+
 exit:
 	kfree(param_headers);
 	return (err) ? err : bfpt_header->minor;
@@ -2162,7 +2298,9 @@ int spi_nor_scan(struct spi_nor *nor, const char *name,
 	if (ret)
 		return ret;
 
-	if (info->addr_width)
+	if (nor->addr_width)
+		; /* already configured by spi_nor_setup(). */
+	else if (info->addr_width)
 		nor->addr_width = info->addr_width;
 	else if (mtd->size > 0x1000000) {
 		/* enable 4-byte addressing if the device exceeds 16MiB */
-- 
2.7.4

[PATCH v3 8/9] mtd: spi-nor: add support to Macronix mx66l1g45g

[Cyrille Pitchen]

This patch adds an entry in the spi_nor_ids[] table to add support
to the Macronix mx66l1g45g.

Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
---
 drivers/mtd/spi-nor/spi-nor.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index db4874d4af79..eb21d3d4e4e6 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -937,6 +937,7 @@ static const struct flash_info spi_nor_ids[] = {
 	{ "mx25l25635e", INFO(0xc22019, 0, 64 * 1024, 512, 0) },
 	{ "mx25l25655e", INFO(0xc22619, 0, 64 * 1024, 512, 0) },
 	{ "mx66l51235l", INFO(0xc2201a, 0, 64 * 1024, 1024, SPI_NOR_QUAD_READ) },
+	{ "mx66l1g45g",  INFO(0xc2201b, 0, 64 * 1024, 2048, SPI_NOR_QUAD_READ) },
 	{ "mx66l1g55g",  INFO(0xc2261b, 0, 64 * 1024, 2048, SPI_NOR_QUAD_READ) },
 
 	/* Micron */
-- 
2.7.4

[PATCH v3 9/9] mtd: spi-nor: add support to SST sst26* QSPI memories

[Cyrille Pitchen]

This patch adds support to the SST sst26* QSPI memories.
It also adds a new SST_BLOCK_PROTECT flag so spi_nor_scan() sends
a SST Global Block Protection Unlock (98h) command once for all
otherwise later Sector Erase and Page Program commands would fail.

It was tested with sst26vf016b, sst26vf032b, sst26vf032ba and sst26vf064b
on a sama5d2 xplained board at 55.3MHz and 3.3V.

sst26wf040b and sst26wf080b were not tested since they are 1.8V memories
hence don't fit the sama5d2 xplained board requirements.

Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
---
 drivers/mtd/spi-nor/spi-nor.c | 20 ++++++++++++++++++++
 include/linux/mtd/spi-nor.h   |  1 +
 2 files changed, 21 insertions(+)

diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index eb21d3d4e4e6..300ee38f4e9a 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -81,6 +81,7 @@ struct flash_info {
 					 * to support memory size above 128Mib.
 					 */
 #define SPI_NOR_SKIP_SFDP	BIT(11) /* Skip read of SFDP tables */
+#define SST_BLOCK_PROTECT	BIT(12)	/* use SST Unlock Block-Protection */
 };
 
 #define JEDEC_MFR(info)	((info)->id[0])
@@ -999,6 +1000,11 @@ static const struct flash_info spi_nor_ids[] = {
 	{ "sst25wf040b", INFO(0x621613, 0, 64 * 1024,  8, SECT_4K) },
 	{ "sst25wf040",  INFO(0xbf2504, 0, 64 * 1024,  8, SECT_4K | SST_WRITE) },
 	{ "sst25wf080",  INFO(0xbf2505, 0, 64 * 1024, 16, SECT_4K | SST_WRITE) },
+	{ "sst26vf016b", INFO(0xbf2641, 0, 64 * 1024, 32, SECT_4K | SST_BLOCK_PROTECT) },
+	{ "sst26vf032b", INFO(0xbf2642, 0, 64 * 1024, 64, SECT_4K | SST_BLOCK_PROTECT) },
+	{ "sst26vf064b", INFO(0xbf2643, 0, 64 * 1024, 128, SECT_4K | SST_BLOCK_PROTECT) },
+	{ "sst26wf040b", INFO(0xbf2654, 0, 64 * 1024,  8, SECT_4K | SST_BLOCK_PROTECT) },
+	{ "sst26wf080b", INFO(0xbf2658, 0, 64 * 1024, 16, SECT_4K | SST_BLOCK_PROTECT) },
 
 	/* ST Microelectronics -- newer production may have feature updates */
 	{ "m25p05",  INFO(0x202010,  0,  32 * 1024,   2, 0) },
@@ -1135,6 +1141,14 @@ static int spi_nor_read(struct mtd_info *mtd, loff_t from, size_t len,
 	return ret;
 }
 
+static int sst_unlock_block_protection(struct spi_nor *nor)
+{
+	int ret;
+
+	ret = write_enable(nor);
+	return ret ? ret : nor->write_reg(nor, SPINOR_OP_ULBPR, NULL, 0);
+}
+
 static int sst_write(struct mtd_info *mtd, loff_t to, size_t len,
 		size_t *retlen, const u_char *buf)
 {
@@ -2321,6 +2335,12 @@ int spi_nor_scan(struct spi_nor *nor, const char *name,
 		return -EINVAL;
 	}
 
+	if (info->flags & SST_BLOCK_PROTECT) {
+		ret = sst_unlock_block_protection(nor);
+		if (ret)
+			return ret;
+	}
+
 	dev_info(dev, "%s (%lld Kbytes)\n", info->name,
 			(long long)mtd->size >> 10);
 
diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h
index 8fd9619dabff..c8f7e231a25c 100644
--- a/include/linux/mtd/spi-nor.h
+++ b/include/linux/mtd/spi-nor.h
@@ -80,6 +80,7 @@
 #define SPINOR_OP_BP		0x02	/* Byte program */
 #define SPINOR_OP_WRDI		0x04	/* Write disable */
 #define SPINOR_OP_AAI_WP	0xad	/* Auto address increment word program */
+#define SPINOR_OP_ULBPR		0x98	/* Global Block Protection Unlock */
 
 /* Used for Macronix and Winbond flashes. */
 #define SPINOR_OP_EN4B		0xb7	/* Enter 4-byte mode */
-- 
2.7.4

Re: [PATCH v3 1/9] mtd: spi-nor: improve macronix_quad_enable()

[Marek Vasut]

On 10/24/2016 06:34 PM, Cyrille Pitchen wrote:
> The patch checks whether the Quad Enable bit is already set in the Status
> Register. If so, the function exits immediately with a successful return
> code. Otherwise, a message is now printed telling we're setting the
> non-volatile bit.
> 
> Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
> Reviewed-by: Jagan Teki <jagan@openedev.com>
> ---
>  drivers/mtd/spi-nor/spi-nor.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
> index d0fc165d7d66..5c87b2d99507 100644
> --- a/drivers/mtd/spi-nor/spi-nor.c
> +++ b/drivers/mtd/spi-nor/spi-nor.c
> @@ -1211,6 +1211,11 @@ static int macronix_quad_enable(struct spi_nor *nor)
>  	val = read_sr(nor);
>  	if (val < 0)
>  		return val;
> +	if (val & SR_QUAD_EN_MX)
> +		return 0;
> +
> +	/* Update the Quad Enable bit. */
> +	dev_info(nor->dev, "setting Macronix Quad Enable (non-volatile) bit\n");

Should probably be dev_dbg(), since this is just churn in the kernel
log. The user doesn't care and the developer can just up the debug level
or add his own printk .

>  	write_enable(nor);
>  
>  	write_sr(nor, val | SR_QUAD_EN_MX);
> 


-- 
Best regards,
Marek Vasut

Re: [PATCH v3 2/9] mtd: spi-nor: add an alternative method to support memory >16MiB

[Marek Vasut]

On 10/24/2016 06:34 PM, Cyrille Pitchen wrote:
> This patch provides an alternative mean to support memory above 16MiB
> (128Mib) by replacing 3byte address op codes by their associated 4byte
> address versions.
> 
> Using the dedicated 4byte address op codes doesn't change the internal
> state of the SPI NOR memory as opposed to using other means such as
> updating a Base Address Register (BAR) and sending command to enter/leave
> the 4byte mode.
> 
> Hence when a CPU reset occurs, early bootloaders don't need to be aware
> of BAR value or 4byte mode being enabled: they can still access the first
> 16MiB of the SPI NOR memory using the regular 3byte address op codes.
> 
> Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
> Tested-by: Vignesh R <vigneshr@ti.com>
> ---
>  drivers/mtd/devices/serial_flash_cmds.h |   7 ---
>  drivers/mtd/devices/st_spi_fsm.c        |  28 ++++-----
>  drivers/mtd/spi-nor/spi-nor.c           | 104 +++++++++++++++++++++++++-------
>  include/linux/mtd/spi-nor.h             |  22 +++++--
>  4 files changed, 113 insertions(+), 48 deletions(-)
> 
> diff --git a/drivers/mtd/devices/serial_flash_cmds.h b/drivers/mtd/devices/serial_flash_cmds.h
> index f59a125295d0..8b81e15105dd 100644
> --- a/drivers/mtd/devices/serial_flash_cmds.h
> +++ b/drivers/mtd/devices/serial_flash_cmds.h
> @@ -18,19 +18,12 @@
>  #define SPINOR_OP_RDVCR		0x85
>  
>  /* JEDEC Standard - Serial Flash Discoverable Parmeters (SFDP) Commands */
> -#define SPINOR_OP_READ_1_2_2	0xbb	/* DUAL I/O READ */
> -#define SPINOR_OP_READ_1_4_4	0xeb	/* QUAD I/O READ */
> -
>  #define SPINOR_OP_WRITE		0x02	/* PAGE PROGRAM */
>  #define SPINOR_OP_WRITE_1_1_2	0xa2	/* DUAL INPUT PROGRAM */
>  #define SPINOR_OP_WRITE_1_2_2	0xd2	/* DUAL INPUT EXT PROGRAM */
>  #define SPINOR_OP_WRITE_1_1_4	0x32	/* QUAD INPUT PROGRAM */
>  #define SPINOR_OP_WRITE_1_4_4	0x12	/* QUAD INPUT EXT PROGRAM */
>  
> -/* READ commands with 32-bit addressing */
> -#define SPINOR_OP_READ4_1_2_2	0xbc
> -#define SPINOR_OP_READ4_1_4_4	0xec
> -

It'd be nice to have this move/rename bit factored out into a separate
patch.

>  /* Configuration flags */
>  #define FLASH_FLAG_SINGLE	0x000000ff
>  #define FLASH_FLAG_READ_WRITE	0x00000001
> diff --git a/drivers/mtd/devices/st_spi_fsm.c b/drivers/mtd/devices/st_spi_fsm.c
> index 5454b4113589..804313a33f2b 100644

[...]

> +static u8 spi_nor_convert_opcode(u8 opcode,
> +				 const struct spi_nor_address_entry *entries,
> +				 size_t num_entries)
> +{
> +	int min, max;
> +
> +	min = 0;
> +	max = num_entries - 1;
> +	while (min <= max) {

It's really not clear at all what this function does, so please add a
comment.

> +		int mid = (min + max) >> 1;
> +		const struct spi_nor_address_entry *entry = &entries[mid];
> +
> +		if (opcode == entry->src_opcode)
> +			return entry->dst_opcode;
> +
> +		if (opcode < entry->src_opcode)
> +			max = mid - 1;
> +		else
> +			min = mid + 1;
> +	}
> +
> +	/* No conversion found */
> +	return opcode;
> +}
> +
> +static u8 spi_nor_3to4_opcode(u8 opcode)
> +{
> +	/* MUST be sorted by 3byte opcode */

Because ... why ?

> +#define ENTRY_3TO4(_opcode)	{ _opcode, _opcode##_4B }

Will this break/be unflexible for flashes with some different 4B opcodes ?

> +	static const struct spi_nor_address_entry spi_nor_3to4_table[] = {
> +		ENTRY_3TO4(SPINOR_OP_PP),		/* 0x02 */
> +		ENTRY_3TO4(SPINOR_OP_READ),		/* 0x03 */
> +		ENTRY_3TO4(SPINOR_OP_READ_FAST),	/* 0x0b */
> +		ENTRY_3TO4(SPINOR_OP_BE_4K),		/* 0x20 */
> +		ENTRY_3TO4(SPINOR_OP_PP_1_1_4),		/* 0x32 */
> +		ENTRY_3TO4(SPINOR_OP_PP_1_4_4),		/* 0x38 */
> +		ENTRY_3TO4(SPINOR_OP_READ_1_1_2),	/* 0x3b */
> +		ENTRY_3TO4(SPINOR_OP_BE_32K),		/* 0x52 */
> +		ENTRY_3TO4(SPINOR_OP_READ_1_1_4),	/* 0x6b */
> +		ENTRY_3TO4(SPINOR_OP_READ_1_2_2),	/* 0xbb */
> +		ENTRY_3TO4(SPINOR_OP_SE),		/* 0xd8 */
> +		ENTRY_3TO4(SPINOR_OP_READ_1_4_4),	/* 0xeb */
> +	};
> +#undef ENTRY_3TO4
> +
> +	return spi_nor_convert_opcode(opcode, spi_nor_3to4_table,
> +				      ARRAY_SIZE(spi_nor_3to4_table));
> +}
> +

[...]

-- 
Best regards,
Marek Vasut

Re: [PATCH v3 5/9] mtd: m25p80: add support of dual and quad spi protocols to all commands

[Marek Vasut]

On 10/24/2016 06:34 PM, Cyrille Pitchen wrote:
> Before this patch, m25p80_read() supported few SPI protocols:
> - regular SPI 1-1-1
> - SPI Dual Output 1-1-2
> - SPI Quad Output 1-1-4
> On the other hand, all other m25p80_*() hooks only supported SPI 1-1-1.
> 
> This patch adds support to all currently existing SPI protocols to
> cover as many protocols as possible.
> 
> Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
> ---
>  drivers/mtd/devices/m25p80.c | 193 +++++++++++++++++++++++++++++++++----------
>  1 file changed, 149 insertions(+), 44 deletions(-)
> 
> diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
> index f0a55c01406b..38778eac6c21 100644
> --- a/drivers/mtd/devices/m25p80.c
> +++ b/drivers/mtd/devices/m25p80.c
> @@ -27,22 +27,64 @@
>  #include <linux/spi/flash.h>
>  #include <linux/mtd/spi-nor.h>
>  
> -#define	MAX_CMD_SIZE		6
> +#define	MAX_CMD_SIZE		16
>  struct m25p {
>  	struct spi_device	*spi;
>  	struct spi_nor		spi_nor;
>  	u8			command[MAX_CMD_SIZE];
>  };
>  
> +static inline int m25p80_proto2nbits(enum spi_nor_protocol proto,

This can be void , since it's always returning zero.

> +				     unsigned *code_nbits,
> +				     unsigned *addr_nbits,
> +				     unsigned *data_nbits)
> +{
> +	if (code_nbits)
> +		*code_nbits = SNOR_PROTO_CODE_FROM_PROTO(proto);
> +	if (addr_nbits)
> +		*addr_nbits = SNOR_PROTO_ADDR_FROM_PROTO(proto);
> +	if (data_nbits)
> +		*data_nbits = SNOR_PROTO_DATA_FROM_PROTO(proto);
> +
> +	return 0;
> +}
> +
[...]


-- 
Best regards,
Marek Vasut

Re: [PATCH v3 8/9] mtd: spi-nor: add support to Macronix mx66l1g45g

[Marek Vasut]

On 10/24/2016 06:34 PM, Cyrille Pitchen wrote:
> This patch adds an entry in the spi_nor_ids[] table to add support
> to the Macronix mx66l1g45g.
> 
> Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
> ---
>  drivers/mtd/spi-nor/spi-nor.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
> index db4874d4af79..eb21d3d4e4e6 100644
> --- a/drivers/mtd/spi-nor/spi-nor.c
> +++ b/drivers/mtd/spi-nor/spi-nor.c
> @@ -937,6 +937,7 @@ static const struct flash_info spi_nor_ids[] = {
>  	{ "mx25l25635e", INFO(0xc22019, 0, 64 * 1024, 512, 0) },
>  	{ "mx25l25655e", INFO(0xc22619, 0, 64 * 1024, 512, 0) },
>  	{ "mx66l51235l", INFO(0xc2201a, 0, 64 * 1024, 1024, SPI_NOR_QUAD_READ) },
> +	{ "mx66l1g45g",  INFO(0xc2201b, 0, 64 * 1024, 2048, SPI_NOR_QUAD_READ) },
>  	{ "mx66l1g55g",  INFO(0xc2261b, 0, 64 * 1024, 2048, SPI_NOR_QUAD_READ) },
>  
>  	/* Micron */
> 
This should be submitted separately as it could be applied right away.

-- 
Best regards,
Marek Vasut

Re: [PATCH v3 9/9] mtd: spi-nor: add support to SST sst26* QSPI memories

[Marek Vasut]

On 10/24/2016 06:34 PM, Cyrille Pitchen wrote:
> This patch adds support to the SST sst26* QSPI memories.
> It also adds a new SST_BLOCK_PROTECT flag so spi_nor_scan() sends
> a SST Global Block Protection Unlock (98h) command once for all
> otherwise later Sector Erase and Page Program commands would fail.
> 
> It was tested with sst26vf016b, sst26vf032b, sst26vf032ba and sst26vf064b
> on a sama5d2 xplained board at 55.3MHz and 3.3V.
> 
> sst26wf040b and sst26wf080b were not tested since they are 1.8V memories
> hence don't fit the sama5d2 xplained board requirements.
> 
> Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
> ---
>  drivers/mtd/spi-nor/spi-nor.c | 20 ++++++++++++++++++++
>  include/linux/mtd/spi-nor.h   |  1 +
>  2 files changed, 21 insertions(+)
> 
> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
> index eb21d3d4e4e6..300ee38f4e9a 100644
> --- a/drivers/mtd/spi-nor/spi-nor.c
> +++ b/drivers/mtd/spi-nor/spi-nor.c
> @@ -81,6 +81,7 @@ struct flash_info {
>  					 * to support memory size above 128Mib.
>  					 */
>  #define SPI_NOR_SKIP_SFDP	BIT(11) /* Skip read of SFDP tables */
> +#define SST_BLOCK_PROTECT	BIT(12)	/* use SST Unlock Block-Protection */
>  };
>  
>  #define JEDEC_MFR(info)	((info)->id[0])
> @@ -999,6 +1000,11 @@ static const struct flash_info spi_nor_ids[] = {
>  	{ "sst25wf040b", INFO(0x621613, 0, 64 * 1024,  8, SECT_4K) },
>  	{ "sst25wf040",  INFO(0xbf2504, 0, 64 * 1024,  8, SECT_4K | SST_WRITE) },
>  	{ "sst25wf080",  INFO(0xbf2505, 0, 64 * 1024, 16, SECT_4K | SST_WRITE) },
> +	{ "sst26vf016b", INFO(0xbf2641, 0, 64 * 1024, 32, SECT_4K | SST_BLOCK_PROTECT) },
> +	{ "sst26vf032b", INFO(0xbf2642, 0, 64 * 1024, 64, SECT_4K | SST_BLOCK_PROTECT) },
> +	{ "sst26vf064b", INFO(0xbf2643, 0, 64 * 1024, 128, SECT_4K | SST_BLOCK_PROTECT) },
> +	{ "sst26wf040b", INFO(0xbf2654, 0, 64 * 1024,  8, SECT_4K | SST_BLOCK_PROTECT) },
> +	{ "sst26wf080b", INFO(0xbf2658, 0, 64 * 1024, 16, SECT_4K | SST_BLOCK_PROTECT) },

You should split adding the chip and adding the sst block protection
into two separate patches.

>  	/* ST Microelectronics -- newer production may have feature updates */
>  	{ "m25p05",  INFO(0x202010,  0,  32 * 1024,   2, 0) },
> @@ -1135,6 +1141,14 @@ static int spi_nor_read(struct mtd_info *mtd, loff_t from, size_t len,
>  	return ret;
>  }
>  
> +static int sst_unlock_block_protection(struct spi_nor *nor)
> +{
> +	int ret;
> +
> +	ret = write_enable(nor);
> +	return ret ? ret : nor->write_reg(nor, SPINOR_OP_ULBPR, NULL, 0);

I'm not a big fan of the ternary here, what about:

ret = write_enable()
if (!ret)
  ret = nor->write_reg();
return ret;

> +}
> +
>  static int sst_write(struct mtd_info *mtd, loff_t to, size_t len,
>  		size_t *retlen, const u_char *buf)
>  {
> @@ -2321,6 +2335,12 @@ int spi_nor_scan(struct spi_nor *nor, const char *name,
>  		return -EINVAL;
>  	}
>  
> +	if (info->flags & SST_BLOCK_PROTECT) {
> +		ret = sst_unlock_block_protection(nor);
> +		if (ret)
> +			return ret;
> +	}
> +
>  	dev_info(dev, "%s (%lld Kbytes)\n", info->name,
>  			(long long)mtd->size >> 10);
>  
> diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h
> index 8fd9619dabff..c8f7e231a25c 100644
> --- a/include/linux/mtd/spi-nor.h
> +++ b/include/linux/mtd/spi-nor.h
> @@ -80,6 +80,7 @@
>  #define SPINOR_OP_BP		0x02	/* Byte program */
>  #define SPINOR_OP_WRDI		0x04	/* Write disable */
>  #define SPINOR_OP_AAI_WP	0xad	/* Auto address increment word program */
> +#define SPINOR_OP_ULBPR		0x98	/* Global Block Protection Unlock */
>  
>  /* Used for Macronix and Winbond flashes. */
>  #define SPINOR_OP_EN4B		0xb7	/* Enter 4-byte mode */
> 


-- 
Best regards,
Marek Vasut

Re: [PATCH v3 1/9] mtd: spi-nor: improve macronix_quad_enable()

[Cyrille Pitchen]

Hi Marek,

Le 25/10/2016 à 00:00, Marek Vasut a écrit :
> On 10/24/2016 06:34 PM, Cyrille Pitchen wrote:
>> The patch checks whether the Quad Enable bit is already set in the Status
>> Register. If so, the function exits immediately with a successful return
>> code. Otherwise, a message is now printed telling we're setting the
>> non-volatile bit.
>>
>> Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
>> Reviewed-by: Jagan Teki <jagan@openedev.com>
>> ---
>>  drivers/mtd/spi-nor/spi-nor.c | 5 +++++
>>  1 file changed, 5 insertions(+)
>>
>> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
>> index d0fc165d7d66..5c87b2d99507 100644
>> --- a/drivers/mtd/spi-nor/spi-nor.c
>> +++ b/drivers/mtd/spi-nor/spi-nor.c
>> @@ -1211,6 +1211,11 @@ static int macronix_quad_enable(struct spi_nor *nor)
>>  	val = read_sr(nor);
>>  	if (val < 0)
>>  		return val;
>> +	if (val & SR_QUAD_EN_MX)
>> +		return 0;
>> +
>> +	/* Update the Quad Enable bit. */
>> +	dev_info(nor->dev, "setting Macronix Quad Enable (non-volatile) bit\n");
> 
> Should probably be dev_dbg(), since this is just churn in the kernel
> log. The user doesn't care and the developer can just up the debug level
> or add his own printk .
>

The Quad Enable bit is non-volatile so this trace should be printed only once
but I'm perfectly fine with using dev_dbg(). I'll change it in the next version.

Best regards,

Cyrille
 
>>  	write_enable(nor);
>>  
>>  	write_sr(nor, val | SR_QUAD_EN_MX);
>>
> 
> 

Re: [PATCH v3 2/9] mtd: spi-nor: add an alternative method to support memory >16MiB

[Cyrille Pitchen]

Le 25/10/2016 à 00:10, Marek Vasut a écrit :
> On 10/24/2016 06:34 PM, Cyrille Pitchen wrote:
>> This patch provides an alternative mean to support memory above 16MiB
>> (128Mib) by replacing 3byte address op codes by their associated 4byte
>> address versions.
>>
>> Using the dedicated 4byte address op codes doesn't change the internal
>> state of the SPI NOR memory as opposed to using other means such as
>> updating a Base Address Register (BAR) and sending command to enter/leave
>> the 4byte mode.
>>
>> Hence when a CPU reset occurs, early bootloaders don't need to be aware
>> of BAR value or 4byte mode being enabled: they can still access the first
>> 16MiB of the SPI NOR memory using the regular 3byte address op codes.
>>
>> Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
>> Tested-by: Vignesh R <vigneshr@ti.com>
>> ---
>>  drivers/mtd/devices/serial_flash_cmds.h |   7 ---
>>  drivers/mtd/devices/st_spi_fsm.c        |  28 ++++-----
>>  drivers/mtd/spi-nor/spi-nor.c           | 104 +++++++++++++++++++++++++-------
>>  include/linux/mtd/spi-nor.h             |  22 +++++--
>>  4 files changed, 113 insertions(+), 48 deletions(-)
>>
>> diff --git a/drivers/mtd/devices/serial_flash_cmds.h b/drivers/mtd/devices/serial_flash_cmds.h
>> index f59a125295d0..8b81e15105dd 100644
>> --- a/drivers/mtd/devices/serial_flash_cmds.h
>> +++ b/drivers/mtd/devices/serial_flash_cmds.h
>> @@ -18,19 +18,12 @@
>>  #define SPINOR_OP_RDVCR		0x85
>>  
>>  /* JEDEC Standard - Serial Flash Discoverable Parmeters (SFDP) Commands */
>> -#define SPINOR_OP_READ_1_2_2	0xbb	/* DUAL I/O READ */
>> -#define SPINOR_OP_READ_1_4_4	0xeb	/* QUAD I/O READ */
>> -
>>  #define SPINOR_OP_WRITE		0x02	/* PAGE PROGRAM */
>>  #define SPINOR_OP_WRITE_1_1_2	0xa2	/* DUAL INPUT PROGRAM */
>>  #define SPINOR_OP_WRITE_1_2_2	0xd2	/* DUAL INPUT EXT PROGRAM */
>>  #define SPINOR_OP_WRITE_1_1_4	0x32	/* QUAD INPUT PROGRAM */
>>  #define SPINOR_OP_WRITE_1_4_4	0x12	/* QUAD INPUT EXT PROGRAM */
>>  
>> -/* READ commands with 32-bit addressing */
>> -#define SPINOR_OP_READ4_1_2_2	0xbc
>> -#define SPINOR_OP_READ4_1_4_4	0xec
>> -
> 
> It'd be nice to have this move/rename bit factored out into a separate
> patch.
> 

OK, I will try to do this. Anyway, this rename seems to break the freshly
merged drivers/spi/spi-bcm-qspi.c, which uses the SPINOR_OP_READ4_* macro so
I have to do something about this driver. IMHO, the broadcom driver should not
select its own op code but use the one provided by read_opcode member of the
struct spi_flash_read_message.

>>  /* Configuration flags */
>>  #define FLASH_FLAG_SINGLE	0x000000ff
>>  #define FLASH_FLAG_READ_WRITE	0x00000001
>> diff --git a/drivers/mtd/devices/st_spi_fsm.c b/drivers/mtd/devices/st_spi_fsm.c
>> index 5454b4113589..804313a33f2b 100644
> 
> [...]
> 
>> +static u8 spi_nor_convert_opcode(u8 opcode,
>> +				 const struct spi_nor_address_entry *entries,
>> +				 size_t num_entries)
>> +{
>> +	int min, max;
>> +
>> +	min = 0;
>> +	max = num_entries - 1;
>> +	while (min <= max) {
> 
> It's really not clear at all what this function does, so please add a
> comment.
> 

This is just a dichotomic search to reduce the number of comparisons: it 
assumes the entries[] array is sorted by ascending src_opcode.

I will add a comment to clarify this point.

>> +		int mid = (min + max) >> 1;
>> +		const struct spi_nor_address_entry *entry = &entries[mid];
>> +
>> +		if (opcode == entry->src_opcode)
>> +			return entry->dst_opcode;
>> +
>> +		if (opcode < entry->src_opcode)
>> +			max = mid - 1;
>> +		else
>> +			min = mid + 1;
>> +	}
>> +
>> +	/* No conversion found */
>> +	return opcode;
>> +}
>> +
>> +static u8 spi_nor_3to4_opcode(u8 opcode)
>> +{
>> +	/* MUST be sorted by 3byte opcode */
> 
> Because ... why ?
>

As explained above, the dichotomic search implemented in
spi_nor_convert_opcode() assumes that the input array is sorted by src_opcode.
 
>> +#define ENTRY_3TO4(_opcode)	{ _opcode, _opcode##_4B }
> 
> Will this break/be unflexible for flashes with some different 4B opcodes ?
>

Of course I cannot provide any guarantee that it will never happen but
currently it seems that all manufacturers use the same op codes. Besides, 
the 4-byte address instruction set is part the of JESD216B specification,
so there is a standard for these op codes and new SPI NOR memories tend
to match this specification by providing the SFDP tables.

Indeed this instruction set is maybe one of the few things where all
manufacturers seem to agree :)
 
>> +	static const struct spi_nor_address_entry spi_nor_3to4_table[] = {
>> +		ENTRY_3TO4(SPINOR_OP_PP),		/* 0x02 */
>> +		ENTRY_3TO4(SPINOR_OP_READ),		/* 0x03 */
>> +		ENTRY_3TO4(SPINOR_OP_READ_FAST),	/* 0x0b */
>> +		ENTRY_3TO4(SPINOR_OP_BE_4K),		/* 0x20 */
>> +		ENTRY_3TO4(SPINOR_OP_PP_1_1_4),		/* 0x32 */
>> +		ENTRY_3TO4(SPINOR_OP_PP_1_4_4),		/* 0x38 */
>> +		ENTRY_3TO4(SPINOR_OP_READ_1_1_2),	/* 0x3b */
>> +		ENTRY_3TO4(SPINOR_OP_BE_32K),		/* 0x52 */
>> +		ENTRY_3TO4(SPINOR_OP_READ_1_1_4),	/* 0x6b */
>> +		ENTRY_3TO4(SPINOR_OP_READ_1_2_2),	/* 0xbb */
>> +		ENTRY_3TO4(SPINOR_OP_SE),		/* 0xd8 */
>> +		ENTRY_3TO4(SPINOR_OP_READ_1_4_4),	/* 0xeb */
>> +	};
>> +#undef ENTRY_3TO4
>> +
>> +	return spi_nor_convert_opcode(opcode, spi_nor_3to4_table,
>> +				      ARRAY_SIZE(spi_nor_3to4_table));
>> +}
>> +
> 
> [...]
> 

Re: [PATCH v3 8/9] mtd: spi-nor: add support to Macronix mx66l1g45g

[Cyrille Pitchen]

Hi Marek,

Le 25/10/2016 à 00:16, Marek Vasut a écrit :
> On 10/24/2016 06:34 PM, Cyrille Pitchen wrote:
>> This patch adds an entry in the spi_nor_ids[] table to add support
>> to the Macronix mx66l1g45g.
>>
>> Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
>> ---
>>  drivers/mtd/spi-nor/spi-nor.c | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
>> index db4874d4af79..eb21d3d4e4e6 100644
>> --- a/drivers/mtd/spi-nor/spi-nor.c
>> +++ b/drivers/mtd/spi-nor/spi-nor.c
>> @@ -937,6 +937,7 @@ static const struct flash_info spi_nor_ids[] = {
>>  	{ "mx25l25635e", INFO(0xc22019, 0, 64 * 1024, 512, 0) },
>>  	{ "mx25l25655e", INFO(0xc22619, 0, 64 * 1024, 512, 0) },
>>  	{ "mx66l51235l", INFO(0xc2201a, 0, 64 * 1024, 1024, SPI_NOR_QUAD_READ) },
>> +	{ "mx66l1g45g",  INFO(0xc2201b, 0, 64 * 1024, 2048, SPI_NOR_QUAD_READ) },
>>  	{ "mx66l1g55g",  INFO(0xc2261b, 0, 64 * 1024, 2048, SPI_NOR_QUAD_READ) },
>>  
>>  	/* Micron */
>>
> This should be submitted separately as it could be applied right away.
> 

I totally agree with you. Indeed I have only provided patch 8 and 9 because
I refer to these memories in the cover letter and to "prove" that I did really
test every memory of the list. If everyone trust me about the test I do, I
will remove patch 8 and 9 in the next version.

By the way, I need to add a remark about the Spansion S25FL127S. The sample I
have is compliant with neither the JESD216B specification nor the Cypress
datasheet. More precisely, the Cypress datasheet claims that the S25FL127S
is compliant with the JESD216B (minor 6) so its Basic Flash Parameter Table
(BFPT) should contain 16 DWORDS.
However my sample claims to be JESD216B compliant (I read minor 6) and that
the BFPT has 16 DWORDS but the 7 last DWORDS of this table are all 0xFFFFFFFF.
Only the first 9 DWORDS are properly filled, the DWORDS described in JESD216
(minor 0).
Also my sample pretend to provide the optional 4-byte address instruction set
(4BAIS) table but the data I read are once again all 0xFFFFFFFF.

It's surprising that this 128Mbit memory supports the 4-byte address
instruction set but the 4-byte Fast Read actually seems to be supported.

Consequently, Fast Read operations work but Sector Erase cannot due to the
0xFF op code read from the 4BAIS table. I think I just have a broken sample so
if anyone can test with another sample and confirm that the SFDP series also
work with Spansion S25FL127S it would be nice! :)

Best regards,

Cyrille

Re: [PATCH v3 1/9] mtd: spi-nor: improve macronix_quad_enable()

[Marek Vasut]

On 10/25/2016 10:52 AM, Cyrille Pitchen wrote:
> Hi Marek,
> 
> Le 25/10/2016 à 00:00, Marek Vasut a écrit :
>> On 10/24/2016 06:34 PM, Cyrille Pitchen wrote:
>>> The patch checks whether the Quad Enable bit is already set in the Status
>>> Register. If so, the function exits immediately with a successful return
>>> code. Otherwise, a message is now printed telling we're setting the
>>> non-volatile bit.
>>>
>>> Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
>>> Reviewed-by: Jagan Teki <jagan@openedev.com>
>>> ---
>>>  drivers/mtd/spi-nor/spi-nor.c | 5 +++++
>>>  1 file changed, 5 insertions(+)
>>>
>>> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
>>> index d0fc165d7d66..5c87b2d99507 100644
>>> --- a/drivers/mtd/spi-nor/spi-nor.c
>>> +++ b/drivers/mtd/spi-nor/spi-nor.c
>>> @@ -1211,6 +1211,11 @@ static int macronix_quad_enable(struct spi_nor *nor)
>>>  	val = read_sr(nor);
>>>  	if (val < 0)
>>>  		return val;
>>> +	if (val & SR_QUAD_EN_MX)
>>> +		return 0;
>>> +
>>> +	/* Update the Quad Enable bit. */
>>> +	dev_info(nor->dev, "setting Macronix Quad Enable (non-volatile) bit\n");
>>
>> Should probably be dev_dbg(), since this is just churn in the kernel
>> log. The user doesn't care and the developer can just up the debug level
>> or add his own printk .
>>
> 
> The Quad Enable bit is non-volatile so this trace should be printed only once
> but I'm perfectly fine with using dev_dbg(). I'll change it in the next version.

I get it, but what's the value of it ? Who will make use of this
information being in the kernel log? The kernel is already chatty enough :)

-- 
Best regards,
Marek Vasut

Re: [PATCH v3 2/9] mtd: spi-nor: add an alternative method to support memory >16MiB

[Marek Vasut]

On 10/25/2016 11:18 AM, Cyrille Pitchen wrote:
> Le 25/10/2016 à 00:10, Marek Vasut a écrit :
>> On 10/24/2016 06:34 PM, Cyrille Pitchen wrote:
>>> This patch provides an alternative mean to support memory above 16MiB
>>> (128Mib) by replacing 3byte address op codes by their associated 4byte
>>> address versions.
>>>
>>> Using the dedicated 4byte address op codes doesn't change the internal
>>> state of the SPI NOR memory as opposed to using other means such as
>>> updating a Base Address Register (BAR) and sending command to enter/leave
>>> the 4byte mode.
>>>
>>> Hence when a CPU reset occurs, early bootloaders don't need to be aware
>>> of BAR value or 4byte mode being enabled: they can still access the first
>>> 16MiB of the SPI NOR memory using the regular 3byte address op codes.
>>>
>>> Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
>>> Tested-by: Vignesh R <vigneshr@ti.com>
>>> ---
>>>  drivers/mtd/devices/serial_flash_cmds.h |   7 ---
>>>  drivers/mtd/devices/st_spi_fsm.c        |  28 ++++-----
>>>  drivers/mtd/spi-nor/spi-nor.c           | 104 +++++++++++++++++++++++++-------
>>>  include/linux/mtd/spi-nor.h             |  22 +++++--
>>>  4 files changed, 113 insertions(+), 48 deletions(-)
>>>
>>> diff --git a/drivers/mtd/devices/serial_flash_cmds.h b/drivers/mtd/devices/serial_flash_cmds.h
>>> index f59a125295d0..8b81e15105dd 100644
>>> --- a/drivers/mtd/devices/serial_flash_cmds.h
>>> +++ b/drivers/mtd/devices/serial_flash_cmds.h
>>> @@ -18,19 +18,12 @@
>>>  #define SPINOR_OP_RDVCR		0x85
>>>  
>>>  /* JEDEC Standard - Serial Flash Discoverable Parmeters (SFDP) Commands */
>>> -#define SPINOR_OP_READ_1_2_2	0xbb	/* DUAL I/O READ */
>>> -#define SPINOR_OP_READ_1_4_4	0xeb	/* QUAD I/O READ */
>>> -
>>>  #define SPINOR_OP_WRITE		0x02	/* PAGE PROGRAM */
>>>  #define SPINOR_OP_WRITE_1_1_2	0xa2	/* DUAL INPUT PROGRAM */
>>>  #define SPINOR_OP_WRITE_1_2_2	0xd2	/* DUAL INPUT EXT PROGRAM */
>>>  #define SPINOR_OP_WRITE_1_1_4	0x32	/* QUAD INPUT PROGRAM */
>>>  #define SPINOR_OP_WRITE_1_4_4	0x12	/* QUAD INPUT EXT PROGRAM */
>>>  
>>> -/* READ commands with 32-bit addressing */
>>> -#define SPINOR_OP_READ4_1_2_2	0xbc
>>> -#define SPINOR_OP_READ4_1_4_4	0xec
>>> -
>>
>> It'd be nice to have this move/rename bit factored out into a separate
>> patch.
>>
> 
> OK, I will try to do this. Anyway, this rename seems to break the freshly
> merged drivers/spi/spi-bcm-qspi.c, which uses the SPINOR_OP_READ4_* macro so
> I have to do something about this driver. IMHO, the broadcom driver should not
> select its own op code but use the one provided by read_opcode member of the
> struct spi_flash_read_message.

Thanks

>>>  /* Configuration flags */
>>>  #define FLASH_FLAG_SINGLE	0x000000ff
>>>  #define FLASH_FLAG_READ_WRITE	0x00000001
>>> diff --git a/drivers/mtd/devices/st_spi_fsm.c b/drivers/mtd/devices/st_spi_fsm.c
>>> index 5454b4113589..804313a33f2b 100644
>>
>> [...]
>>
>>> +static u8 spi_nor_convert_opcode(u8 opcode,
>>> +				 const struct spi_nor_address_entry *entries,
>>> +				 size_t num_entries)
>>> +{
>>> +	int min, max;
>>> +
>>> +	min = 0;
>>> +	max = num_entries - 1;
>>> +	while (min <= max) {
>>
>> It's really not clear at all what this function does, so please add a
>> comment.
>>
> 
> This is just a dichotomic search to reduce the number of comparisons: it 
> assumes the entries[] array is sorted by ascending src_opcode.
> 
> I will add a comment to clarify this point.

Cool, that'd help. Are you invoking this every time an opcode is
submitted to the SPI NOR ?

>>> +		int mid = (min + max) >> 1;
>>> +		const struct spi_nor_address_entry *entry = &entries[mid];
>>> +
>>> +		if (opcode == entry->src_opcode)
>>> +			return entry->dst_opcode;
>>> +
>>> +		if (opcode < entry->src_opcode)
>>> +			max = mid - 1;
>>> +		else
>>> +			min = mid + 1;
>>> +	}
>>> +
>>> +	/* No conversion found */
>>> +	return opcode;
>>> +}
>>> +
>>> +static u8 spi_nor_3to4_opcode(u8 opcode)
>>> +{
>>> +	/* MUST be sorted by 3byte opcode */
>>
>> Because ... why ?
>>
> 
> As explained above, the dichotomic search implemented in
> spi_nor_convert_opcode() assumes that the input array is sorted by src_opcode.

Maybe you should drop that assumption and do normal traversal of the
array ? I feel this is a bit fragile and will break once someone will
cluelessly add a new opcode.

... or add a comment with a big WARNING statement.

>>> +#define ENTRY_3TO4(_opcode)	{ _opcode, _opcode##_4B }
>>
>> Will this break/be unflexible for flashes with some different 4B opcodes ?
>>
> 
> Of course I cannot provide any guarantee that it will never happen but
> currently it seems that all manufacturers use the same op codes. Besides, 
> the 4-byte address instruction set is part the of JESD216B specification,
> so there is a standard for these op codes and new SPI NOR memories tend
> to match this specification by providing the SFDP tables.

Great. Still, will the code need an overhaul if some vendor decides to
deviate ?

> Indeed this instruction set is maybe one of the few things where all
> manufacturers seem to agree :)

That's a good start :)

>>> +	static const struct spi_nor_address_entry spi_nor_3to4_table[] = {
>>> +		ENTRY_3TO4(SPINOR_OP_PP),		/* 0x02 */
>>> +		ENTRY_3TO4(SPINOR_OP_READ),		/* 0x03 */
>>> +		ENTRY_3TO4(SPINOR_OP_READ_FAST),	/* 0x0b */
>>> +		ENTRY_3TO4(SPINOR_OP_BE_4K),		/* 0x20 */
>>> +		ENTRY_3TO4(SPINOR_OP_PP_1_1_4),		/* 0x32 */
>>> +		ENTRY_3TO4(SPINOR_OP_PP_1_4_4),		/* 0x38 */
>>> +		ENTRY_3TO4(SPINOR_OP_READ_1_1_2),	/* 0x3b */
>>> +		ENTRY_3TO4(SPINOR_OP_BE_32K),		/* 0x52 */
>>> +		ENTRY_3TO4(SPINOR_OP_READ_1_1_4),	/* 0x6b */
>>> +		ENTRY_3TO4(SPINOR_OP_READ_1_2_2),	/* 0xbb */
>>> +		ENTRY_3TO4(SPINOR_OP_SE),		/* 0xd8 */
>>> +		ENTRY_3TO4(SPINOR_OP_READ_1_4_4),	/* 0xeb */
>>> +	};
>>> +#undef ENTRY_3TO4
>>> +
>>> +	return spi_nor_convert_opcode(opcode, spi_nor_3to4_table,
>>> +				      ARRAY_SIZE(spi_nor_3to4_table));
>>> +}
>>> +
>>
>> [...]
>>
> 


-- 
Best regards,
Marek Vasut

Re: [PATCH v3 8/9] mtd: spi-nor: add support to Macronix mx66l1g45g

[Marek Vasut]

On 10/25/2016 11:39 AM, Cyrille Pitchen wrote:
> Hi Marek,

Hi,

> Le 25/10/2016 à 00:16, Marek Vasut a écrit :
>> On 10/24/2016 06:34 PM, Cyrille Pitchen wrote:
>>> This patch adds an entry in the spi_nor_ids[] table to add support
>>> to the Macronix mx66l1g45g.
>>>
>>> Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
>>> ---
>>>  drivers/mtd/spi-nor/spi-nor.c | 1 +
>>>  1 file changed, 1 insertion(+)
>>>
>>> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
>>> index db4874d4af79..eb21d3d4e4e6 100644
>>> --- a/drivers/mtd/spi-nor/spi-nor.c
>>> +++ b/drivers/mtd/spi-nor/spi-nor.c
>>> @@ -937,6 +937,7 @@ static const struct flash_info spi_nor_ids[] = {
>>>  	{ "mx25l25635e", INFO(0xc22019, 0, 64 * 1024, 512, 0) },
>>>  	{ "mx25l25655e", INFO(0xc22619, 0, 64 * 1024, 512, 0) },
>>>  	{ "mx66l51235l", INFO(0xc2201a, 0, 64 * 1024, 1024, SPI_NOR_QUAD_READ) },
>>> +	{ "mx66l1g45g",  INFO(0xc2201b, 0, 64 * 1024, 2048, SPI_NOR_QUAD_READ) },
>>>  	{ "mx66l1g55g",  INFO(0xc2261b, 0, 64 * 1024, 2048, SPI_NOR_QUAD_READ) },
>>>  
>>>  	/* Micron */
>>>
>> This should be submitted separately as it could be applied right away.
>>
> 
> I totally agree with you. Indeed I have only provided patch 8 and 9 because
> I refer to these memories in the cover letter and to "prove" that I did really
> test every memory of the list. If everyone trust me about the test I do, I
> will remove patch 8 and 9 in the next version.

I think 9 needs to stay or be separated somehow differently from the
series, since it also adds some code to support the flash. Otherwise,
go for submitting them separately.

> By the way, I need to add a remark about the Spansion S25FL127S. The sample I
> have is compliant with neither the JESD216B specification nor the Cypress
> datasheet. More precisely, the Cypress datasheet claims that the S25FL127S
> is compliant with the JESD216B (minor 6) so its Basic Flash Parameter Table
> (BFPT) should contain 16 DWORDS.
> However my sample claims to be JESD216B compliant (I read minor 6) and that
> the BFPT has 16 DWORDS but the 7 last DWORDS of this table are all 0xFFFFFFFF.
> Only the first 9 DWORDS are properly filled, the DWORDS described in JESD216
> (minor 0).
> Also my sample pretend to provide the optional 4-byte address instruction set
> (4BAIS) table but the data I read are once again all 0xFFFFFFFF.
> 
> It's surprising that this 128Mbit memory supports the 4-byte address
> instruction set but the 4-byte Fast Read actually seems to be supported.

They probably use the same HDL design for the controller block in many
memories, they just burn in different ID/SFDP/geometry tables for each
chip they roll out from the factory based on how well the memory array
works.

> Consequently, Fast Read operations work but Sector Erase cannot due to the
> 0xFF op code read from the 4BAIS table. I think I just have a broken sample so
> if anyone can test with another sample and confirm that the SFDP series also
> work with Spansion S25FL127S it would be nice! :)

I don't have one, sorry.

-- 
Best regards,
Marek Vasut

Re: [PATCH v3 2/9] mtd: spi-nor: add an alternative method to support memory >16MiB

[Jagan Teki]

Hi Cyrille,

On Mon, Oct 24, 2016 at 10:04 PM, Cyrille Pitchen
<cyrille.pitchen@atmel.com> wrote:
> This patch provides an alternative mean to support memory above 16MiB
> (128Mib) by replacing 3byte address op codes by their associated 4byte
> address versions.
>
> Using the dedicated 4byte address op codes doesn't change the internal
> state of the SPI NOR memory as opposed to using other means such as
> updating a Base Address Register (BAR) and sending command to enter/leave
> the 4byte mode.
>
> Hence when a CPU reset occurs, early bootloaders don't need to be aware
> of BAR value or 4byte mode being enabled: they can still access the first
> 16MiB of the SPI NOR memory using the regular 3byte address op codes.
>
> Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
> Tested-by: Vignesh R <vigneshr@ti.com>
> ---
>  drivers/mtd/devices/serial_flash_cmds.h |   7 ---
>  drivers/mtd/devices/st_spi_fsm.c        |  28 ++++-----
>  drivers/mtd/spi-nor/spi-nor.c           | 104 +++++++++++++++++++++++++-------
>  include/linux/mtd/spi-nor.h             |  22 +++++--
>  4 files changed, 113 insertions(+), 48 deletions(-)
>
> diff --git a/drivers/mtd/devices/serial_flash_cmds.h b/drivers/mtd/devices/serial_flash_cmds.h
> index f59a125295d0..8b81e15105dd 100644
> --- a/drivers/mtd/devices/serial_flash_cmds.h
> +++ b/drivers/mtd/devices/serial_flash_cmds.h
> @@ -18,19 +18,12 @@
>  #define SPINOR_OP_RDVCR                0x85
>
>  /* JEDEC Standard - Serial Flash Discoverable Parmeters (SFDP) Commands */
> -#define SPINOR_OP_READ_1_2_2   0xbb    /* DUAL I/O READ */
> -#define SPINOR_OP_READ_1_4_4   0xeb    /* QUAD I/O READ */
> -
>  #define SPINOR_OP_WRITE                0x02    /* PAGE PROGRAM */
>  #define SPINOR_OP_WRITE_1_1_2  0xa2    /* DUAL INPUT PROGRAM */
>  #define SPINOR_OP_WRITE_1_2_2  0xd2    /* DUAL INPUT EXT PROGRAM */
>  #define SPINOR_OP_WRITE_1_1_4  0x32    /* QUAD INPUT PROGRAM */
>  #define SPINOR_OP_WRITE_1_4_4  0x12    /* QUAD INPUT EXT PROGRAM */
>
> -/* READ commands with 32-bit addressing */
> -#define SPINOR_OP_READ4_1_2_2  0xbc
> -#define SPINOR_OP_READ4_1_4_4  0xec
> -
>  /* Configuration flags */
>  #define FLASH_FLAG_SINGLE      0x000000ff
>  #define FLASH_FLAG_READ_WRITE  0x00000001
> diff --git a/drivers/mtd/devices/st_spi_fsm.c b/drivers/mtd/devices/st_spi_fsm.c
> index 5454b4113589..804313a33f2b 100644
> --- a/drivers/mtd/devices/st_spi_fsm.c
> +++ b/drivers/mtd/devices/st_spi_fsm.c
> @@ -507,13 +507,13 @@ static struct seq_rw_config n25q_read3_configs[] = {
>   *     - 'FAST' variants configured for 8 dummy cycles (see note above.)
>   */
>  static struct seq_rw_config n25q_read4_configs[] = {
> -       {FLASH_FLAG_READ_1_4_4, SPINOR_OP_READ4_1_4_4,  0, 4, 4, 0x00, 0, 8},
> -       {FLASH_FLAG_READ_1_1_4, SPINOR_OP_READ4_1_1_4,  0, 1, 4, 0x00, 0, 8},
> -       {FLASH_FLAG_READ_1_2_2, SPINOR_OP_READ4_1_2_2,  0, 2, 2, 0x00, 0, 8},
> -       {FLASH_FLAG_READ_1_1_2, SPINOR_OP_READ4_1_1_2,  0, 1, 2, 0x00, 0, 8},
> -       {FLASH_FLAG_READ_FAST,  SPINOR_OP_READ4_FAST,   0, 1, 1, 0x00, 0, 8},
> -       {FLASH_FLAG_READ_WRITE, SPINOR_OP_READ4,        0, 1, 1, 0x00, 0, 0},
> -       {0x00,                  0,                      0, 0, 0, 0x00, 0, 0},
> +       {FLASH_FLAG_READ_1_4_4, SPINOR_OP_READ_1_4_4_4B, 0, 4, 4, 0x00, 0, 8},
> +       {FLASH_FLAG_READ_1_1_4, SPINOR_OP_READ_1_1_4_4B, 0, 1, 4, 0x00, 0, 8},
> +       {FLASH_FLAG_READ_1_2_2, SPINOR_OP_READ_1_2_2_4B, 0, 2, 2, 0x00, 0, 8},
> +       {FLASH_FLAG_READ_1_1_2, SPINOR_OP_READ_1_1_2_4B, 0, 1, 2, 0x00, 0, 8},
> +       {FLASH_FLAG_READ_FAST,  SPINOR_OP_READ_FAST_4B,  0, 1, 1, 0x00, 0, 8},
> +       {FLASH_FLAG_READ_WRITE, SPINOR_OP_READ_4B,       0, 1, 1, 0x00, 0, 0},
> +       {0x00,                  0,                       0, 0, 0, 0x00, 0, 0},
>  };
>
>  /*
> @@ -553,13 +553,13 @@ static int stfsm_mx25_en_32bit_addr_seq(struct stfsm_seq *seq)
>   * entering a state that is incompatible with the SPIBoot Controller.
>   */
>  static struct seq_rw_config stfsm_s25fl_read4_configs[] = {
> -       {FLASH_FLAG_READ_1_4_4,  SPINOR_OP_READ4_1_4_4,  0, 4, 4, 0x00, 2, 4},
> -       {FLASH_FLAG_READ_1_1_4,  SPINOR_OP_READ4_1_1_4,  0, 1, 4, 0x00, 0, 8},
> -       {FLASH_FLAG_READ_1_2_2,  SPINOR_OP_READ4_1_2_2,  0, 2, 2, 0x00, 4, 0},
> -       {FLASH_FLAG_READ_1_1_2,  SPINOR_OP_READ4_1_1_2,  0, 1, 2, 0x00, 0, 8},
> -       {FLASH_FLAG_READ_FAST,   SPINOR_OP_READ4_FAST,   0, 1, 1, 0x00, 0, 8},
> -       {FLASH_FLAG_READ_WRITE,  SPINOR_OP_READ4,        0, 1, 1, 0x00, 0, 0},
> -       {0x00,                   0,                      0, 0, 0, 0x00, 0, 0},
> +       {FLASH_FLAG_READ_1_4_4,  SPINOR_OP_READ_1_4_4_4B,  0, 4, 4, 0x00, 2, 4},
> +       {FLASH_FLAG_READ_1_1_4,  SPINOR_OP_READ_1_1_4_4B,  0, 1, 4, 0x00, 0, 8},
> +       {FLASH_FLAG_READ_1_2_2,  SPINOR_OP_READ_1_2_2_4B,  0, 2, 2, 0x00, 4, 0},
> +       {FLASH_FLAG_READ_1_1_2,  SPINOR_OP_READ_1_1_2_4B,  0, 1, 2, 0x00, 0, 8},
> +       {FLASH_FLAG_READ_FAST,   SPINOR_OP_READ_FAST_4B,   0, 1, 1, 0x00, 0, 8},
> +       {FLASH_FLAG_READ_WRITE,  SPINOR_OP_READ_4B,        0, 1, 1, 0x00, 0, 0},
> +       {0x00,                   0,                        0, 0, 0, 0x00, 0, 0},
>  };
>
>  static struct seq_rw_config stfsm_s25fl_write4_configs[] = {
> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
> index 5c87b2d99507..423448c1c7a8 100644
> --- a/drivers/mtd/spi-nor/spi-nor.c
> +++ b/drivers/mtd/spi-nor/spi-nor.c
> @@ -75,6 +75,10 @@ struct flash_info {
>                                          * bit. Must be used with
>                                          * SPI_NOR_HAS_LOCK.
>                                          */
> +#define SPI_NOR_4B_OPCODES     BIT(10) /*
> +                                        * Use dedicated 4byte address op codes
> +                                        * to support memory size above 128Mib.
> +                                        */
>  };
>
>  #define JEDEC_MFR(info)        ((info)->id[0])
> @@ -188,6 +192,81 @@ static inline struct spi_nor *mtd_to_spi_nor(struct mtd_info *mtd)
>         return mtd->priv;
>  }
>
> +
> +struct spi_nor_address_entry {
> +       u8      src_opcode;
> +       u8      dst_opcode;
> +};
> +
> +static u8 spi_nor_convert_opcode(u8 opcode,
> +                                const struct spi_nor_address_entry *entries,
> +                                size_t num_entries)
> +{
> +       int min, max;
> +
> +       min = 0;
> +       max = num_entries - 1;
> +       while (min <= max) {
> +               int mid = (min + max) >> 1;
> +               const struct spi_nor_address_entry *entry = &entries[mid];
> +
> +               if (opcode == entry->src_opcode)
> +                       return entry->dst_opcode;
> +
> +               if (opcode < entry->src_opcode)
> +                       max = mid - 1;
> +               else
> +                       min = mid + 1;
> +       }
> +
> +       /* No conversion found */
> +       return opcode;
> +}
> +
> +static u8 spi_nor_3to4_opcode(u8 opcode)
> +{
> +       /* MUST be sorted by 3byte opcode */
> +#define ENTRY_3TO4(_opcode)    { _opcode, _opcode##_4B }
> +       static const struct spi_nor_address_entry spi_nor_3to4_table[] = {
> +               ENTRY_3TO4(SPINOR_OP_PP),               /* 0x02 */
> +               ENTRY_3TO4(SPINOR_OP_READ),             /* 0x03 */
> +               ENTRY_3TO4(SPINOR_OP_READ_FAST),        /* 0x0b */
> +               ENTRY_3TO4(SPINOR_OP_BE_4K),            /* 0x20 */
> +               ENTRY_3TO4(SPINOR_OP_PP_1_1_4),         /* 0x32 */
> +               ENTRY_3TO4(SPINOR_OP_PP_1_4_4),         /* 0x38 */
> +               ENTRY_3TO4(SPINOR_OP_READ_1_1_2),       /* 0x3b */
> +               ENTRY_3TO4(SPINOR_OP_BE_32K),           /* 0x52 */
> +               ENTRY_3TO4(SPINOR_OP_READ_1_1_4),       /* 0x6b */
> +               ENTRY_3TO4(SPINOR_OP_READ_1_2_2),       /* 0xbb */
> +               ENTRY_3TO4(SPINOR_OP_SE),               /* 0xd8 */
> +               ENTRY_3TO4(SPINOR_OP_READ_1_4_4),       /* 0xeb */
> +       };
> +#undef ENTRY_3TO4
> +
> +       return spi_nor_convert_opcode(opcode, spi_nor_3to4_table,
> +                                     ARRAY_SIZE(spi_nor_3to4_table));
> +}
> +
> +static void spi_nor_set_4byte_opcodes(struct spi_nor *nor,
> +                                     const struct flash_info *info)
> +{
> +       /* Do some manufacturer fixups first */
> +       switch (JEDEC_MFR(info)) {
> +       case SNOR_MFR_SPANSION:
> +               /* No small sector erase for 4-byte command set */
> +               nor->erase_opcode = SPINOR_OP_SE;
> +               nor->mtd.erasesize = info->sector_size;
> +               break;
> +
> +       default:
> +               break;
> +       }
> +
> +       nor->read_opcode        = spi_nor_3to4_opcode(nor->read_opcode);
> +       nor->program_opcode     = spi_nor_3to4_opcode(nor->program_opcode);
> +       nor->erase_opcode       = spi_nor_3to4_opcode(nor->erase_opcode);
> +}
> +
>  /* Enable/disable 4-byte addressing mode. */
>  static inline int set_4byte(struct spi_nor *nor, const struct flash_info *info,
>                             int enable)
> @@ -1476,27 +1555,10 @@ int spi_nor_scan(struct spi_nor *nor, const char *name, enum read_mode mode)
>         else if (mtd->size > 0x1000000) {
>                 /* enable 4-byte addressing if the device exceeds 16MiB */
>                 nor->addr_width = 4;
> -               if (JEDEC_MFR(info) == SNOR_MFR_SPANSION) {
> -                       /* Dedicated 4-byte command set */
> -                       switch (nor->flash_read) {
> -                       case SPI_NOR_QUAD:
> -                               nor->read_opcode = SPINOR_OP_READ4_1_1_4;
> -                               break;
> -                       case SPI_NOR_DUAL:
> -                               nor->read_opcode = SPINOR_OP_READ4_1_1_2;
> -                               break;
> -                       case SPI_NOR_FAST:
> -                               nor->read_opcode = SPINOR_OP_READ4_FAST;
> -                               break;
> -                       case SPI_NOR_NORMAL:
> -                               nor->read_opcode = SPINOR_OP_READ4;
> -                               break;
> -                       }
> -                       nor->program_opcode = SPINOR_OP_PP_4B;
> -                       /* No small sector erase for 4-byte command set */
> -                       nor->erase_opcode = SPINOR_OP_SE_4B;
> -                       mtd->erasesize = info->sector_size;
> -               } else
> +               if (JEDEC_MFR(info) == SNOR_MFR_SPANSION ||
> +                   info->flags & SPI_NOR_4B_OPCODES)
> +                       spi_nor_set_4byte_opcodes(nor, info);

I am giving my inputs based on the discussion on this thread[1].

Seems like winbond[2], stmicron, spansion look better way or equally
same for accessing 4-byte addressing commands. and I find few of the
Macronix [3] have support of 4B addressing(see Table 5) but
lack/unable to find the 4B opcodes.

And about BAR support, based on my experience in u-boot and research
on above chips only require when controller isn't supporting 4-byte
addressing even if connected flash chip has > 16MiB, that means there
is no exact or equivalent requirement for flash side either.

So, adding the flags on flash table might be the good option instead
making code to convert 3B opcode to 4B because anyway the chips
require SPI_NOR_4B_OPCODES and also except winbond, stmicron, spansion
not too many flash needed > 16MiB support as of now.

[1] https://lkml.org/lkml/2016/10/24/276
[2] https://www.winbond.com/resource-files/w25q256fv_revg1_120214_qpi_website_rev_g.pdf
[3] http://www.zlgmcu.com/mxic/pdf/NOR_Flash_c/MX25L25635E_DS_EN.pdf

thanks!
-- 
Jagan Teki
Free Software Engineer | www.openedev.com
U-Boot, Linux | Upstream Maintainer
Hyderabad, India.

Re: [PATCH v3 2/9] mtd: spi-nor: add an alternative method to support memory >16MiB

[Cyrille Pitchen]

Hi,

Le 31/10/2016 à 19:51, Jagan Teki a écrit :
> Hi Cyrille,
> 
> On Mon, Oct 24, 2016 at 10:04 PM, Cyrille Pitchen
> <cyrille.pitchen@atmel.com> wrote:
>> This patch provides an alternative mean to support memory above 16MiB
>> (128Mib) by replacing 3byte address op codes by their associated 4byte
>> address versions.
>>
>> Using the dedicated 4byte address op codes doesn't change the internal
>> state of the SPI NOR memory as opposed to using other means such as
>> updating a Base Address Register (BAR) and sending command to enter/leave
>> the 4byte mode.
>>
>> Hence when a CPU reset occurs, early bootloaders don't need to be aware
>> of BAR value or 4byte mode being enabled: they can still access the first
>> 16MiB of the SPI NOR memory using the regular 3byte address op codes.
>>
>> Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
>> Tested-by: Vignesh R <vigneshr@ti.com>
>> ---
>>  drivers/mtd/devices/serial_flash_cmds.h |   7 ---
>>  drivers/mtd/devices/st_spi_fsm.c        |  28 ++++-----
>>  drivers/mtd/spi-nor/spi-nor.c           | 104 +++++++++++++++++++++++++-------
>>  include/linux/mtd/spi-nor.h             |  22 +++++--
>>  4 files changed, 113 insertions(+), 48 deletions(-)
>>
>> diff --git a/drivers/mtd/devices/serial_flash_cmds.h b/drivers/mtd/devices/serial_flash_cmds.h
>> index f59a125295d0..8b81e15105dd 100644
>> --- a/drivers/mtd/devices/serial_flash_cmds.h
>> +++ b/drivers/mtd/devices/serial_flash_cmds.h
>> @@ -18,19 +18,12 @@
>>  #define SPINOR_OP_RDVCR                0x85
>>
>>  /* JEDEC Standard - Serial Flash Discoverable Parmeters (SFDP) Commands */
>> -#define SPINOR_OP_READ_1_2_2   0xbb    /* DUAL I/O READ */
>> -#define SPINOR_OP_READ_1_4_4   0xeb    /* QUAD I/O READ */
>> -
>>  #define SPINOR_OP_WRITE                0x02    /* PAGE PROGRAM */
>>  #define SPINOR_OP_WRITE_1_1_2  0xa2    /* DUAL INPUT PROGRAM */
>>  #define SPINOR_OP_WRITE_1_2_2  0xd2    /* DUAL INPUT EXT PROGRAM */
>>  #define SPINOR_OP_WRITE_1_1_4  0x32    /* QUAD INPUT PROGRAM */
>>  #define SPINOR_OP_WRITE_1_4_4  0x12    /* QUAD INPUT EXT PROGRAM */
>>
>> -/* READ commands with 32-bit addressing */
>> -#define SPINOR_OP_READ4_1_2_2  0xbc
>> -#define SPINOR_OP_READ4_1_4_4  0xec
>> -
>>  /* Configuration flags */
>>  #define FLASH_FLAG_SINGLE      0x000000ff
>>  #define FLASH_FLAG_READ_WRITE  0x00000001
>> diff --git a/drivers/mtd/devices/st_spi_fsm.c b/drivers/mtd/devices/st_spi_fsm.c
>> index 5454b4113589..804313a33f2b 100644
>> --- a/drivers/mtd/devices/st_spi_fsm.c
>> +++ b/drivers/mtd/devices/st_spi_fsm.c
>> @@ -507,13 +507,13 @@ static struct seq_rw_config n25q_read3_configs[] = {
>>   *     - 'FAST' variants configured for 8 dummy cycles (see note above.)
>>   */
>>  static struct seq_rw_config n25q_read4_configs[] = {
>> -       {FLASH_FLAG_READ_1_4_4, SPINOR_OP_READ4_1_4_4,  0, 4, 4, 0x00, 0, 8},
>> -       {FLASH_FLAG_READ_1_1_4, SPINOR_OP_READ4_1_1_4,  0, 1, 4, 0x00, 0, 8},
>> -       {FLASH_FLAG_READ_1_2_2, SPINOR_OP_READ4_1_2_2,  0, 2, 2, 0x00, 0, 8},
>> -       {FLASH_FLAG_READ_1_1_2, SPINOR_OP_READ4_1_1_2,  0, 1, 2, 0x00, 0, 8},
>> -       {FLASH_FLAG_READ_FAST,  SPINOR_OP_READ4_FAST,   0, 1, 1, 0x00, 0, 8},
>> -       {FLASH_FLAG_READ_WRITE, SPINOR_OP_READ4,        0, 1, 1, 0x00, 0, 0},
>> -       {0x00,                  0,                      0, 0, 0, 0x00, 0, 0},
>> +       {FLASH_FLAG_READ_1_4_4, SPINOR_OP_READ_1_4_4_4B, 0, 4, 4, 0x00, 0, 8},
>> +       {FLASH_FLAG_READ_1_1_4, SPINOR_OP_READ_1_1_4_4B, 0, 1, 4, 0x00, 0, 8},
>> +       {FLASH_FLAG_READ_1_2_2, SPINOR_OP_READ_1_2_2_4B, 0, 2, 2, 0x00, 0, 8},
>> +       {FLASH_FLAG_READ_1_1_2, SPINOR_OP_READ_1_1_2_4B, 0, 1, 2, 0x00, 0, 8},
>> +       {FLASH_FLAG_READ_FAST,  SPINOR_OP_READ_FAST_4B,  0, 1, 1, 0x00, 0, 8},
>> +       {FLASH_FLAG_READ_WRITE, SPINOR_OP_READ_4B,       0, 1, 1, 0x00, 0, 0},
>> +       {0x00,                  0,                       0, 0, 0, 0x00, 0, 0},
>>  };
>>
>>  /*
>> @@ -553,13 +553,13 @@ static int stfsm_mx25_en_32bit_addr_seq(struct stfsm_seq *seq)
>>   * entering a state that is incompatible with the SPIBoot Controller.
>>   */
>>  static struct seq_rw_config stfsm_s25fl_read4_configs[] = {
>> -       {FLASH_FLAG_READ_1_4_4,  SPINOR_OP_READ4_1_4_4,  0, 4, 4, 0x00, 2, 4},
>> -       {FLASH_FLAG_READ_1_1_4,  SPINOR_OP_READ4_1_1_4,  0, 1, 4, 0x00, 0, 8},
>> -       {FLASH_FLAG_READ_1_2_2,  SPINOR_OP_READ4_1_2_2,  0, 2, 2, 0x00, 4, 0},
>> -       {FLASH_FLAG_READ_1_1_2,  SPINOR_OP_READ4_1_1_2,  0, 1, 2, 0x00, 0, 8},
>> -       {FLASH_FLAG_READ_FAST,   SPINOR_OP_READ4_FAST,   0, 1, 1, 0x00, 0, 8},
>> -       {FLASH_FLAG_READ_WRITE,  SPINOR_OP_READ4,        0, 1, 1, 0x00, 0, 0},
>> -       {0x00,                   0,                      0, 0, 0, 0x00, 0, 0},
>> +       {FLASH_FLAG_READ_1_4_4,  SPINOR_OP_READ_1_4_4_4B,  0, 4, 4, 0x00, 2, 4},
>> +       {FLASH_FLAG_READ_1_1_4,  SPINOR_OP_READ_1_1_4_4B,  0, 1, 4, 0x00, 0, 8},
>> +       {FLASH_FLAG_READ_1_2_2,  SPINOR_OP_READ_1_2_2_4B,  0, 2, 2, 0x00, 4, 0},
>> +       {FLASH_FLAG_READ_1_1_2,  SPINOR_OP_READ_1_1_2_4B,  0, 1, 2, 0x00, 0, 8},
>> +       {FLASH_FLAG_READ_FAST,   SPINOR_OP_READ_FAST_4B,   0, 1, 1, 0x00, 0, 8},
>> +       {FLASH_FLAG_READ_WRITE,  SPINOR_OP_READ_4B,        0, 1, 1, 0x00, 0, 0},
>> +       {0x00,                   0,                        0, 0, 0, 0x00, 0, 0},
>>  };
>>
>>  static struct seq_rw_config stfsm_s25fl_write4_configs[] = {
>> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
>> index 5c87b2d99507..423448c1c7a8 100644
>> --- a/drivers/mtd/spi-nor/spi-nor.c
>> +++ b/drivers/mtd/spi-nor/spi-nor.c
>> @@ -75,6 +75,10 @@ struct flash_info {
>>                                          * bit. Must be used with
>>                                          * SPI_NOR_HAS_LOCK.
>>                                          */
>> +#define SPI_NOR_4B_OPCODES     BIT(10) /*
>> +                                        * Use dedicated 4byte address op codes
>> +                                        * to support memory size above 128Mib.
>> +                                        */
>>  };
>>
>>  #define JEDEC_MFR(info)        ((info)->id[0])
>> @@ -188,6 +192,81 @@ static inline struct spi_nor *mtd_to_spi_nor(struct mtd_info *mtd)
>>         return mtd->priv;
>>  }
>>
>> +
>> +struct spi_nor_address_entry {
>> +       u8      src_opcode;
>> +       u8      dst_opcode;
>> +};
>> +
>> +static u8 spi_nor_convert_opcode(u8 opcode,
>> +                                const struct spi_nor_address_entry *entries,
>> +                                size_t num_entries)
>> +{
>> +       int min, max;
>> +
>> +       min = 0;
>> +       max = num_entries - 1;
>> +       while (min <= max) {
>> +               int mid = (min + max) >> 1;
>> +               const struct spi_nor_address_entry *entry = &entries[mid];
>> +
>> +               if (opcode == entry->src_opcode)
>> +                       return entry->dst_opcode;
>> +
>> +               if (opcode < entry->src_opcode)
>> +                       max = mid - 1;
>> +               else
>> +                       min = mid + 1;
>> +       }
>> +
>> +       /* No conversion found */
>> +       return opcode;
>> +}
>> +
>> +static u8 spi_nor_3to4_opcode(u8 opcode)
>> +{
>> +       /* MUST be sorted by 3byte opcode */
>> +#define ENTRY_3TO4(_opcode)    { _opcode, _opcode##_4B }
>> +       static const struct spi_nor_address_entry spi_nor_3to4_table[] = {
>> +               ENTRY_3TO4(SPINOR_OP_PP),               /* 0x02 */
>> +               ENTRY_3TO4(SPINOR_OP_READ),             /* 0x03 */
>> +               ENTRY_3TO4(SPINOR_OP_READ_FAST),        /* 0x0b */
>> +               ENTRY_3TO4(SPINOR_OP_BE_4K),            /* 0x20 */
>> +               ENTRY_3TO4(SPINOR_OP_PP_1_1_4),         /* 0x32 */
>> +               ENTRY_3TO4(SPINOR_OP_PP_1_4_4),         /* 0x38 */
>> +               ENTRY_3TO4(SPINOR_OP_READ_1_1_2),       /* 0x3b */
>> +               ENTRY_3TO4(SPINOR_OP_BE_32K),           /* 0x52 */
>> +               ENTRY_3TO4(SPINOR_OP_READ_1_1_4),       /* 0x6b */
>> +               ENTRY_3TO4(SPINOR_OP_READ_1_2_2),       /* 0xbb */
>> +               ENTRY_3TO4(SPINOR_OP_SE),               /* 0xd8 */
>> +               ENTRY_3TO4(SPINOR_OP_READ_1_4_4),       /* 0xeb */
>> +       };
>> +#undef ENTRY_3TO4
>> +
>> +       return spi_nor_convert_opcode(opcode, spi_nor_3to4_table,
>> +                                     ARRAY_SIZE(spi_nor_3to4_table));
>> +}
>> +
>> +static void spi_nor_set_4byte_opcodes(struct spi_nor *nor,
>> +                                     const struct flash_info *info)
>> +{
>> +       /* Do some manufacturer fixups first */
>> +       switch (JEDEC_MFR(info)) {
>> +       case SNOR_MFR_SPANSION:
>> +               /* No small sector erase for 4-byte command set */
>> +               nor->erase_opcode = SPINOR_OP_SE;
>> +               nor->mtd.erasesize = info->sector_size;
>> +               break;
>> +
>> +       default:
>> +               break;
>> +       }
>> +
>> +       nor->read_opcode        = spi_nor_3to4_opcode(nor->read_opcode);
>> +       nor->program_opcode     = spi_nor_3to4_opcode(nor->program_opcode);
>> +       nor->erase_opcode       = spi_nor_3to4_opcode(nor->erase_opcode);
>> +}
>> +
>>  /* Enable/disable 4-byte addressing mode. */
>>  static inline int set_4byte(struct spi_nor *nor, const struct flash_info *info,
>>                             int enable)
>> @@ -1476,27 +1555,10 @@ int spi_nor_scan(struct spi_nor *nor, const char *name, enum read_mode mode)
>>         else if (mtd->size > 0x1000000) {
>>                 /* enable 4-byte addressing if the device exceeds 16MiB */
>>                 nor->addr_width = 4;
>> -               if (JEDEC_MFR(info) == SNOR_MFR_SPANSION) {
>> -                       /* Dedicated 4-byte command set */
>> -                       switch (nor->flash_read) {
>> -                       case SPI_NOR_QUAD:
>> -                               nor->read_opcode = SPINOR_OP_READ4_1_1_4;
>> -                               break;
>> -                       case SPI_NOR_DUAL:
>> -                               nor->read_opcode = SPINOR_OP_READ4_1_1_2;
>> -                               break;
>> -                       case SPI_NOR_FAST:
>> -                               nor->read_opcode = SPINOR_OP_READ4_FAST;
>> -                               break;
>> -                       case SPI_NOR_NORMAL:
>> -                               nor->read_opcode = SPINOR_OP_READ4;
>> -                               break;
>> -                       }
>> -                       nor->program_opcode = SPINOR_OP_PP_4B;
>> -                       /* No small sector erase for 4-byte command set */
>> -                       nor->erase_opcode = SPINOR_OP_SE_4B;
>> -                       mtd->erasesize = info->sector_size;
>> -               } else
>> +               if (JEDEC_MFR(info) == SNOR_MFR_SPANSION ||
>> +                   info->flags & SPI_NOR_4B_OPCODES)
>> +                       spi_nor_set_4byte_opcodes(nor, info);
> 
> I am giving my inputs based on the discussion on this thread[1].
> 
> Seems like winbond[2], stmicron, spansion look better way or equally
> same for accessing 4-byte addressing commands. and I find few of the
> Macronix [3] have support of 4B addressing(see Table 5) but
> lack/unable to find the 4B opcodes.
> 

The Macronix mx25l25635e has no 4-byte address op codes. Instead you can
use the EN4B (enter 4-byte mode) B7h op code to make the memory enter its
4-byte mode: hence you still write one of the 3-byte address op code but now
this op code is followed by a 4-byte address.
Currently the spi-nor framework uses this EN4B op code for all but Spansion
memories. However entering this 4-byte mode is statefull.
For the Macronix 35e won't be able to use the 4-byte address instruction set
and we will keep on entering the 4-byte mode.

The idea behind the patch is to use the 4-byte address instruction set when
we are absolutely sure this set is supported by a given memory but keep the
current behaviour for other memories.

> And about BAR support, based on my experience in u-boot and research
> on above chips only require when controller isn't supporting 4-byte
> addressing even if connected flash chip has > 16MiB, that means there
> is no exact or equivalent requirement for flash side either.
> 
> So, adding the flags on flash table might be the good option instead
> making code to convert 3B opcode to 4B because anyway the chips
> require SPI_NOR_4B_OPCODES and also except winbond, stmicron, spansion
> not too many flash needed > 16MiB support as of now.
> 

Sorry but I don't understand what you mean or suggest here!

> [1] https://lkml.org/lkml/2016/10/24/276
> [2] https://www.winbond.com/resource-files/w25q256fv_revg1_120214_qpi_website_rev_g.pdf
> [3] http://www.zlgmcu.com/mxic/pdf/NOR_Flash_c/MX25L25635E_DS_EN.pdf
> 
> thanks!
> 

Re: [PATCH v3 2/9] mtd: spi-nor: add an alternative method to support memory >16MiB

[Jagan Teki]

On Wed, Nov 2, 2016 at 4:19 PM, Cyrille Pitchen
<cyrille.pitchen@atmel.com> wrote:
> Hi,
>
> Le 31/10/2016 à 19:51, Jagan Teki a écrit :
>> Hi Cyrille,
>>
>> On Mon, Oct 24, 2016 at 10:04 PM, Cyrille Pitchen
>> <cyrille.pitchen@atmel.com> wrote:
>>> This patch provides an alternative mean to support memory above 16MiB
>>> (128Mib) by replacing 3byte address op codes by their associated 4byte
>>> address versions.
>>>
>>> Using the dedicated 4byte address op codes doesn't change the internal
>>> state of the SPI NOR memory as opposed to using other means such as
>>> updating a Base Address Register (BAR) and sending command to enter/leave
>>> the 4byte mode.
>>>
>>> Hence when a CPU reset occurs, early bootloaders don't need to be aware
>>> of BAR value or 4byte mode being enabled: they can still access the first
>>> 16MiB of the SPI NOR memory using the regular 3byte address op codes.
>>>
>>> Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
>>> Tested-by: Vignesh R <vigneshr@ti.com>
>>> ---
>>>  drivers/mtd/devices/serial_flash_cmds.h |   7 ---
>>>  drivers/mtd/devices/st_spi_fsm.c        |  28 ++++-----
>>>  drivers/mtd/spi-nor/spi-nor.c           | 104 +++++++++++++++++++++++++-------
>>>  include/linux/mtd/spi-nor.h             |  22 +++++--
>>>  4 files changed, 113 insertions(+), 48 deletions(-)
>>>
>>> diff --git a/drivers/mtd/devices/serial_flash_cmds.h b/drivers/mtd/devices/serial_flash_cmds.h
>>> index f59a125295d0..8b81e15105dd 100644
>>> --- a/drivers/mtd/devices/serial_flash_cmds.h
>>> +++ b/drivers/mtd/devices/serial_flash_cmds.h
>>> @@ -18,19 +18,12 @@
>>>  #define SPINOR_OP_RDVCR                0x85
>>>
>>>  /* JEDEC Standard - Serial Flash Discoverable Parmeters (SFDP) Commands */
>>> -#define SPINOR_OP_READ_1_2_2   0xbb    /* DUAL I/O READ */
>>> -#define SPINOR_OP_READ_1_4_4   0xeb    /* QUAD I/O READ */
>>> -
>>>  #define SPINOR_OP_WRITE                0x02    /* PAGE PROGRAM */
>>>  #define SPINOR_OP_WRITE_1_1_2  0xa2    /* DUAL INPUT PROGRAM */
>>>  #define SPINOR_OP_WRITE_1_2_2  0xd2    /* DUAL INPUT EXT PROGRAM */
>>>  #define SPINOR_OP_WRITE_1_1_4  0x32    /* QUAD INPUT PROGRAM */
>>>  #define SPINOR_OP_WRITE_1_4_4  0x12    /* QUAD INPUT EXT PROGRAM */
>>>
>>> -/* READ commands with 32-bit addressing */
>>> -#define SPINOR_OP_READ4_1_2_2  0xbc
>>> -#define SPINOR_OP_READ4_1_4_4  0xec
>>> -
>>>  /* Configuration flags */
>>>  #define FLASH_FLAG_SINGLE      0x000000ff
>>>  #define FLASH_FLAG_READ_WRITE  0x00000001
>>> diff --git a/drivers/mtd/devices/st_spi_fsm.c b/drivers/mtd/devices/st_spi_fsm.c
>>> index 5454b4113589..804313a33f2b 100644
>>> --- a/drivers/mtd/devices/st_spi_fsm.c
>>> +++ b/drivers/mtd/devices/st_spi_fsm.c
>>> @@ -507,13 +507,13 @@ static struct seq_rw_config n25q_read3_configs[] = {
>>>   *     - 'FAST' variants configured for 8 dummy cycles (see note above.)
>>>   */
>>>  static struct seq_rw_config n25q_read4_configs[] = {
>>> -       {FLASH_FLAG_READ_1_4_4, SPINOR_OP_READ4_1_4_4,  0, 4, 4, 0x00, 0, 8},
>>> -       {FLASH_FLAG_READ_1_1_4, SPINOR_OP_READ4_1_1_4,  0, 1, 4, 0x00, 0, 8},
>>> -       {FLASH_FLAG_READ_1_2_2, SPINOR_OP_READ4_1_2_2,  0, 2, 2, 0x00, 0, 8},
>>> -       {FLASH_FLAG_READ_1_1_2, SPINOR_OP_READ4_1_1_2,  0, 1, 2, 0x00, 0, 8},
>>> -       {FLASH_FLAG_READ_FAST,  SPINOR_OP_READ4_FAST,   0, 1, 1, 0x00, 0, 8},
>>> -       {FLASH_FLAG_READ_WRITE, SPINOR_OP_READ4,        0, 1, 1, 0x00, 0, 0},
>>> -       {0x00,                  0,                      0, 0, 0, 0x00, 0, 0},
>>> +       {FLASH_FLAG_READ_1_4_4, SPINOR_OP_READ_1_4_4_4B, 0, 4, 4, 0x00, 0, 8},
>>> +       {FLASH_FLAG_READ_1_1_4, SPINOR_OP_READ_1_1_4_4B, 0, 1, 4, 0x00, 0, 8},
>>> +       {FLASH_FLAG_READ_1_2_2, SPINOR_OP_READ_1_2_2_4B, 0, 2, 2, 0x00, 0, 8},
>>> +       {FLASH_FLAG_READ_1_1_2, SPINOR_OP_READ_1_1_2_4B, 0, 1, 2, 0x00, 0, 8},
>>> +       {FLASH_FLAG_READ_FAST,  SPINOR_OP_READ_FAST_4B,  0, 1, 1, 0x00, 0, 8},
>>> +       {FLASH_FLAG_READ_WRITE, SPINOR_OP_READ_4B,       0, 1, 1, 0x00, 0, 0},
>>> +       {0x00,                  0,                       0, 0, 0, 0x00, 0, 0},
>>>  };
>>>
>>>  /*
>>> @@ -553,13 +553,13 @@ static int stfsm_mx25_en_32bit_addr_seq(struct stfsm_seq *seq)
>>>   * entering a state that is incompatible with the SPIBoot Controller.
>>>   */
>>>  static struct seq_rw_config stfsm_s25fl_read4_configs[] = {
>>> -       {FLASH_FLAG_READ_1_4_4,  SPINOR_OP_READ4_1_4_4,  0, 4, 4, 0x00, 2, 4},
>>> -       {FLASH_FLAG_READ_1_1_4,  SPINOR_OP_READ4_1_1_4,  0, 1, 4, 0x00, 0, 8},
>>> -       {FLASH_FLAG_READ_1_2_2,  SPINOR_OP_READ4_1_2_2,  0, 2, 2, 0x00, 4, 0},
>>> -       {FLASH_FLAG_READ_1_1_2,  SPINOR_OP_READ4_1_1_2,  0, 1, 2, 0x00, 0, 8},
>>> -       {FLASH_FLAG_READ_FAST,   SPINOR_OP_READ4_FAST,   0, 1, 1, 0x00, 0, 8},
>>> -       {FLASH_FLAG_READ_WRITE,  SPINOR_OP_READ4,        0, 1, 1, 0x00, 0, 0},
>>> -       {0x00,                   0,                      0, 0, 0, 0x00, 0, 0},
>>> +       {FLASH_FLAG_READ_1_4_4,  SPINOR_OP_READ_1_4_4_4B,  0, 4, 4, 0x00, 2, 4},
>>> +       {FLASH_FLAG_READ_1_1_4,  SPINOR_OP_READ_1_1_4_4B,  0, 1, 4, 0x00, 0, 8},
>>> +       {FLASH_FLAG_READ_1_2_2,  SPINOR_OP_READ_1_2_2_4B,  0, 2, 2, 0x00, 4, 0},
>>> +       {FLASH_FLAG_READ_1_1_2,  SPINOR_OP_READ_1_1_2_4B,  0, 1, 2, 0x00, 0, 8},
>>> +       {FLASH_FLAG_READ_FAST,   SPINOR_OP_READ_FAST_4B,   0, 1, 1, 0x00, 0, 8},
>>> +       {FLASH_FLAG_READ_WRITE,  SPINOR_OP_READ_4B,        0, 1, 1, 0x00, 0, 0},
>>> +       {0x00,                   0,                        0, 0, 0, 0x00, 0, 0},
>>>  };
>>>
>>>  static struct seq_rw_config stfsm_s25fl_write4_configs[] = {
>>> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
>>> index 5c87b2d99507..423448c1c7a8 100644
>>> --- a/drivers/mtd/spi-nor/spi-nor.c
>>> +++ b/drivers/mtd/spi-nor/spi-nor.c
>>> @@ -75,6 +75,10 @@ struct flash_info {
>>>                                          * bit. Must be used with
>>>                                          * SPI_NOR_HAS_LOCK.
>>>                                          */
>>> +#define SPI_NOR_4B_OPCODES     BIT(10) /*
>>> +                                        * Use dedicated 4byte address op codes
>>> +                                        * to support memory size above 128Mib.
>>> +                                        */
>>>  };
>>>
>>>  #define JEDEC_MFR(info)        ((info)->id[0])
>>> @@ -188,6 +192,81 @@ static inline struct spi_nor *mtd_to_spi_nor(struct mtd_info *mtd)
>>>         return mtd->priv;
>>>  }
>>>
>>> +
>>> +struct spi_nor_address_entry {
>>> +       u8      src_opcode;
>>> +       u8      dst_opcode;
>>> +};
>>> +
>>> +static u8 spi_nor_convert_opcode(u8 opcode,
>>> +                                const struct spi_nor_address_entry *entries,
>>> +                                size_t num_entries)
>>> +{
>>> +       int min, max;
>>> +
>>> +       min = 0;
>>> +       max = num_entries - 1;
>>> +       while (min <= max) {
>>> +               int mid = (min + max) >> 1;
>>> +               const struct spi_nor_address_entry *entry = &entries[mid];
>>> +
>>> +               if (opcode == entry->src_opcode)
>>> +                       return entry->dst_opcode;
>>> +
>>> +               if (opcode < entry->src_opcode)
>>> +                       max = mid - 1;
>>> +               else
>>> +                       min = mid + 1;
>>> +       }
>>> +
>>> +       /* No conversion found */
>>> +       return opcode;
>>> +}
>>> +
>>> +static u8 spi_nor_3to4_opcode(u8 opcode)
>>> +{
>>> +       /* MUST be sorted by 3byte opcode */
>>> +#define ENTRY_3TO4(_opcode)    { _opcode, _opcode##_4B }
>>> +       static const struct spi_nor_address_entry spi_nor_3to4_table[] = {
>>> +               ENTRY_3TO4(SPINOR_OP_PP),               /* 0x02 */
>>> +               ENTRY_3TO4(SPINOR_OP_READ),             /* 0x03 */
>>> +               ENTRY_3TO4(SPINOR_OP_READ_FAST),        /* 0x0b */
>>> +               ENTRY_3TO4(SPINOR_OP_BE_4K),            /* 0x20 */
>>> +               ENTRY_3TO4(SPINOR_OP_PP_1_1_4),         /* 0x32 */
>>> +               ENTRY_3TO4(SPINOR_OP_PP_1_4_4),         /* 0x38 */
>>> +               ENTRY_3TO4(SPINOR_OP_READ_1_1_2),       /* 0x3b */
>>> +               ENTRY_3TO4(SPINOR_OP_BE_32K),           /* 0x52 */
>>> +               ENTRY_3TO4(SPINOR_OP_READ_1_1_4),       /* 0x6b */
>>> +               ENTRY_3TO4(SPINOR_OP_READ_1_2_2),       /* 0xbb */
>>> +               ENTRY_3TO4(SPINOR_OP_SE),               /* 0xd8 */
>>> +               ENTRY_3TO4(SPINOR_OP_READ_1_4_4),       /* 0xeb */
>>> +       };
>>> +#undef ENTRY_3TO4
>>> +
>>> +       return spi_nor_convert_opcode(opcode, spi_nor_3to4_table,
>>> +                                     ARRAY_SIZE(spi_nor_3to4_table));
>>> +}
>>> +
>>> +static void spi_nor_set_4byte_opcodes(struct spi_nor *nor,
>>> +                                     const struct flash_info *info)
>>> +{
>>> +       /* Do some manufacturer fixups first */
>>> +       switch (JEDEC_MFR(info)) {
>>> +       case SNOR_MFR_SPANSION:
>>> +               /* No small sector erase for 4-byte command set */
>>> +               nor->erase_opcode = SPINOR_OP_SE;
>>> +               nor->mtd.erasesize = info->sector_size;
>>> +               break;
>>> +
>>> +       default:
>>> +               break;
>>> +       }
>>> +
>>> +       nor->read_opcode        = spi_nor_3to4_opcode(nor->read_opcode);
>>> +       nor->program_opcode     = spi_nor_3to4_opcode(nor->program_opcode);
>>> +       nor->erase_opcode       = spi_nor_3to4_opcode(nor->erase_opcode);
>>> +}
>>> +
>>>  /* Enable/disable 4-byte addressing mode. */
>>>  static inline int set_4byte(struct spi_nor *nor, const struct flash_info *info,
>>>                             int enable)
>>> @@ -1476,27 +1555,10 @@ int spi_nor_scan(struct spi_nor *nor, const char *name, enum read_mode mode)
>>>         else if (mtd->size > 0x1000000) {
>>>                 /* enable 4-byte addressing if the device exceeds 16MiB */
>>>                 nor->addr_width = 4;
>>> -               if (JEDEC_MFR(info) == SNOR_MFR_SPANSION) {
>>> -                       /* Dedicated 4-byte command set */
>>> -                       switch (nor->flash_read) {
>>> -                       case SPI_NOR_QUAD:
>>> -                               nor->read_opcode = SPINOR_OP_READ4_1_1_4;
>>> -                               break;
>>> -                       case SPI_NOR_DUAL:
>>> -                               nor->read_opcode = SPINOR_OP_READ4_1_1_2;
>>> -                               break;
>>> -                       case SPI_NOR_FAST:
>>> -                               nor->read_opcode = SPINOR_OP_READ4_FAST;
>>> -                               break;
>>> -                       case SPI_NOR_NORMAL:
>>> -                               nor->read_opcode = SPINOR_OP_READ4;
>>> -                               break;
>>> -                       }
>>> -                       nor->program_opcode = SPINOR_OP_PP_4B;
>>> -                       /* No small sector erase for 4-byte command set */
>>> -                       nor->erase_opcode = SPINOR_OP_SE_4B;
>>> -                       mtd->erasesize = info->sector_size;
>>> -               } else
>>> +               if (JEDEC_MFR(info) == SNOR_MFR_SPANSION ||
>>> +                   info->flags & SPI_NOR_4B_OPCODES)
>>> +                       spi_nor_set_4byte_opcodes(nor, info);
>>
>> I am giving my inputs based on the discussion on this thread[1].
>>
>> Seems like winbond[2], stmicron, spansion look better way or equally
>> same for accessing 4-byte addressing commands. and I find few of the
>> Macronix [3] have support of 4B addressing(see Table 5) but
>> lack/unable to find the 4B opcodes.
>>
>
> The Macronix mx25l25635e has no 4-byte address op codes. Instead you can
> use the EN4B (enter 4-byte mode) B7h op code to make the memory enter its
> 4-byte mode: hence you still write one of the 3-byte address op code but now
> this op code is followed by a 4-byte address.
> Currently the spi-nor framework uses this EN4B op code for all but Spansion
> memories. However entering this 4-byte mode is statefull.
> For the Macronix 35e won't be able to use the 4-byte address instruction set
> and we will keep on entering the 4-byte mode.
>
> The idea behind the patch is to use the 4-byte address instruction set when
> we are absolutely sure this set is supported by a given memory but keep the
> current behaviour for other memories.
>
>> And about BAR support, based on my experience in u-boot and research
>> on above chips only require when controller isn't supporting 4-byte
>> addressing even if connected flash chip has > 16MiB, that means there
>> is no exact or equivalent requirement for flash side either.
>>
>> So, adding the flags on flash table might be the good option instead
>> making code to convert 3B opcode to 4B because anyway the chips
>> require SPI_NOR_4B_OPCODES and also except winbond, stmicron, spansion
>> not too many flash needed > 16MiB support as of now.
>>
>
> Sorry but I don't understand what you mean or suggest here!

OK, What I am trying to say here is except the Macronix reaming chips
- Winbond, Stmicron, Spansion has a similar way of opcode handling. So
why can't we add the flags for supporting chips instead of 3B_to_4B
conversion I'm thinking this conversion of opcodes not much helpful
here as we dealing only few vendor chips and also not adequate for all
scenarios.

thanks!
-- 
Jagan Teki
Free Software Engineer | www.openedev.com
U-Boot, Linux | Upstream Maintainer
Hyderabad, India.

Re: [PATCH v3 2/9] mtd: spi-nor: add an alternative method to support memory >16MiB

[Cyrille Pitchen]

Le 02/11/2016 à 12:11, Jagan Teki a écrit :
> On Wed, Nov 2, 2016 at 4:19 PM, Cyrille Pitchen
> <cyrille.pitchen@atmel.com> wrote:
>> Hi,
>>
>> Le 31/10/2016 à 19:51, Jagan Teki a écrit :
>>> Hi Cyrille,
>>>
>>> On Mon, Oct 24, 2016 at 10:04 PM, Cyrille Pitchen
>>> <cyrille.pitchen@atmel.com> wrote:
>>>> This patch provides an alternative mean to support memory above 16MiB
>>>> (128Mib) by replacing 3byte address op codes by their associated 4byte
>>>> address versions.
>>>>
>>>> Using the dedicated 4byte address op codes doesn't change the internal
>>>> state of the SPI NOR memory as opposed to using other means such as
>>>> updating a Base Address Register (BAR) and sending command to enter/leave
>>>> the 4byte mode.
>>>>
>>>> Hence when a CPU reset occurs, early bootloaders don't need to be aware
>>>> of BAR value or 4byte mode being enabled: they can still access the first
>>>> 16MiB of the SPI NOR memory using the regular 3byte address op codes.
>>>>
>>>> Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
>>>> Tested-by: Vignesh R <vigneshr@ti.com>
>>>> ---
>>>>  drivers/mtd/devices/serial_flash_cmds.h |   7 ---
>>>>  drivers/mtd/devices/st_spi_fsm.c        |  28 ++++-----
>>>>  drivers/mtd/spi-nor/spi-nor.c           | 104 +++++++++++++++++++++++++-------
>>>>  include/linux/mtd/spi-nor.h             |  22 +++++--
>>>>  4 files changed, 113 insertions(+), 48 deletions(-)
>>>>
>>>> diff --git a/drivers/mtd/devices/serial_flash_cmds.h b/drivers/mtd/devices/serial_flash_cmds.h
>>>> index f59a125295d0..8b81e15105dd 100644
>>>> --- a/drivers/mtd/devices/serial_flash_cmds.h
>>>> +++ b/drivers/mtd/devices/serial_flash_cmds.h
>>>> @@ -18,19 +18,12 @@
>>>>  #define SPINOR_OP_RDVCR                0x85
>>>>
>>>>  /* JEDEC Standard - Serial Flash Discoverable Parmeters (SFDP) Commands */
>>>> -#define SPINOR_OP_READ_1_2_2   0xbb    /* DUAL I/O READ */
>>>> -#define SPINOR_OP_READ_1_4_4   0xeb    /* QUAD I/O READ */
>>>> -
>>>>  #define SPINOR_OP_WRITE                0x02    /* PAGE PROGRAM */
>>>>  #define SPINOR_OP_WRITE_1_1_2  0xa2    /* DUAL INPUT PROGRAM */
>>>>  #define SPINOR_OP_WRITE_1_2_2  0xd2    /* DUAL INPUT EXT PROGRAM */
>>>>  #define SPINOR_OP_WRITE_1_1_4  0x32    /* QUAD INPUT PROGRAM */
>>>>  #define SPINOR_OP_WRITE_1_4_4  0x12    /* QUAD INPUT EXT PROGRAM */
>>>>
>>>> -/* READ commands with 32-bit addressing */
>>>> -#define SPINOR_OP_READ4_1_2_2  0xbc
>>>> -#define SPINOR_OP_READ4_1_4_4  0xec
>>>> -
>>>>  /* Configuration flags */
>>>>  #define FLASH_FLAG_SINGLE      0x000000ff
>>>>  #define FLASH_FLAG_READ_WRITE  0x00000001
>>>> diff --git a/drivers/mtd/devices/st_spi_fsm.c b/drivers/mtd/devices/st_spi_fsm.c
>>>> index 5454b4113589..804313a33f2b 100644
>>>> --- a/drivers/mtd/devices/st_spi_fsm.c
>>>> +++ b/drivers/mtd/devices/st_spi_fsm.c
>>>> @@ -507,13 +507,13 @@ static struct seq_rw_config n25q_read3_configs[] = {
>>>>   *     - 'FAST' variants configured for 8 dummy cycles (see note above.)
>>>>   */
>>>>  static struct seq_rw_config n25q_read4_configs[] = {
>>>> -       {FLASH_FLAG_READ_1_4_4, SPINOR_OP_READ4_1_4_4,  0, 4, 4, 0x00, 0, 8},
>>>> -       {FLASH_FLAG_READ_1_1_4, SPINOR_OP_READ4_1_1_4,  0, 1, 4, 0x00, 0, 8},
>>>> -       {FLASH_FLAG_READ_1_2_2, SPINOR_OP_READ4_1_2_2,  0, 2, 2, 0x00, 0, 8},
>>>> -       {FLASH_FLAG_READ_1_1_2, SPINOR_OP_READ4_1_1_2,  0, 1, 2, 0x00, 0, 8},
>>>> -       {FLASH_FLAG_READ_FAST,  SPINOR_OP_READ4_FAST,   0, 1, 1, 0x00, 0, 8},
>>>> -       {FLASH_FLAG_READ_WRITE, SPINOR_OP_READ4,        0, 1, 1, 0x00, 0, 0},
>>>> -       {0x00,                  0,                      0, 0, 0, 0x00, 0, 0},
>>>> +       {FLASH_FLAG_READ_1_4_4, SPINOR_OP_READ_1_4_4_4B, 0, 4, 4, 0x00, 0, 8},
>>>> +       {FLASH_FLAG_READ_1_1_4, SPINOR_OP_READ_1_1_4_4B, 0, 1, 4, 0x00, 0, 8},
>>>> +       {FLASH_FLAG_READ_1_2_2, SPINOR_OP_READ_1_2_2_4B, 0, 2, 2, 0x00, 0, 8},
>>>> +       {FLASH_FLAG_READ_1_1_2, SPINOR_OP_READ_1_1_2_4B, 0, 1, 2, 0x00, 0, 8},
>>>> +       {FLASH_FLAG_READ_FAST,  SPINOR_OP_READ_FAST_4B,  0, 1, 1, 0x00, 0, 8},
>>>> +       {FLASH_FLAG_READ_WRITE, SPINOR_OP_READ_4B,       0, 1, 1, 0x00, 0, 0},
>>>> +       {0x00,                  0,                       0, 0, 0, 0x00, 0, 0},
>>>>  };
>>>>
>>>>  /*
>>>> @@ -553,13 +553,13 @@ static int stfsm_mx25_en_32bit_addr_seq(struct stfsm_seq *seq)
>>>>   * entering a state that is incompatible with the SPIBoot Controller.
>>>>   */
>>>>  static struct seq_rw_config stfsm_s25fl_read4_configs[] = {
>>>> -       {FLASH_FLAG_READ_1_4_4,  SPINOR_OP_READ4_1_4_4,  0, 4, 4, 0x00, 2, 4},
>>>> -       {FLASH_FLAG_READ_1_1_4,  SPINOR_OP_READ4_1_1_4,  0, 1, 4, 0x00, 0, 8},
>>>> -       {FLASH_FLAG_READ_1_2_2,  SPINOR_OP_READ4_1_2_2,  0, 2, 2, 0x00, 4, 0},
>>>> -       {FLASH_FLAG_READ_1_1_2,  SPINOR_OP_READ4_1_1_2,  0, 1, 2, 0x00, 0, 8},
>>>> -       {FLASH_FLAG_READ_FAST,   SPINOR_OP_READ4_FAST,   0, 1, 1, 0x00, 0, 8},
>>>> -       {FLASH_FLAG_READ_WRITE,  SPINOR_OP_READ4,        0, 1, 1, 0x00, 0, 0},
>>>> -       {0x00,                   0,                      0, 0, 0, 0x00, 0, 0},
>>>> +       {FLASH_FLAG_READ_1_4_4,  SPINOR_OP_READ_1_4_4_4B,  0, 4, 4, 0x00, 2, 4},
>>>> +       {FLASH_FLAG_READ_1_1_4,  SPINOR_OP_READ_1_1_4_4B,  0, 1, 4, 0x00, 0, 8},
>>>> +       {FLASH_FLAG_READ_1_2_2,  SPINOR_OP_READ_1_2_2_4B,  0, 2, 2, 0x00, 4, 0},
>>>> +       {FLASH_FLAG_READ_1_1_2,  SPINOR_OP_READ_1_1_2_4B,  0, 1, 2, 0x00, 0, 8},
>>>> +       {FLASH_FLAG_READ_FAST,   SPINOR_OP_READ_FAST_4B,   0, 1, 1, 0x00, 0, 8},
>>>> +       {FLASH_FLAG_READ_WRITE,  SPINOR_OP_READ_4B,        0, 1, 1, 0x00, 0, 0},
>>>> +       {0x00,                   0,                        0, 0, 0, 0x00, 0, 0},
>>>>  };
>>>>
>>>>  static struct seq_rw_config stfsm_s25fl_write4_configs[] = {
>>>> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
>>>> index 5c87b2d99507..423448c1c7a8 100644
>>>> --- a/drivers/mtd/spi-nor/spi-nor.c
>>>> +++ b/drivers/mtd/spi-nor/spi-nor.c
>>>> @@ -75,6 +75,10 @@ struct flash_info {
>>>>                                          * bit. Must be used with
>>>>                                          * SPI_NOR_HAS_LOCK.
>>>>                                          */
>>>> +#define SPI_NOR_4B_OPCODES     BIT(10) /*
>>>> +                                        * Use dedicated 4byte address op codes
>>>> +                                        * to support memory size above 128Mib.
>>>> +                                        */
>>>>  };
>>>>
>>>>  #define JEDEC_MFR(info)        ((info)->id[0])
>>>> @@ -188,6 +192,81 @@ static inline struct spi_nor *mtd_to_spi_nor(struct mtd_info *mtd)
>>>>         return mtd->priv;
>>>>  }
>>>>
>>>> +
>>>> +struct spi_nor_address_entry {
>>>> +       u8      src_opcode;
>>>> +       u8      dst_opcode;
>>>> +};
>>>> +
>>>> +static u8 spi_nor_convert_opcode(u8 opcode,
>>>> +                                const struct spi_nor_address_entry *entries,
>>>> +                                size_t num_entries)
>>>> +{
>>>> +       int min, max;
>>>> +
>>>> +       min = 0;
>>>> +       max = num_entries - 1;
>>>> +       while (min <= max) {
>>>> +               int mid = (min + max) >> 1;
>>>> +               const struct spi_nor_address_entry *entry = &entries[mid];
>>>> +
>>>> +               if (opcode == entry->src_opcode)
>>>> +                       return entry->dst_opcode;
>>>> +
>>>> +               if (opcode < entry->src_opcode)
>>>> +                       max = mid - 1;
>>>> +               else
>>>> +                       min = mid + 1;
>>>> +       }
>>>> +
>>>> +       /* No conversion found */
>>>> +       return opcode;
>>>> +}
>>>> +
>>>> +static u8 spi_nor_3to4_opcode(u8 opcode)
>>>> +{
>>>> +       /* MUST be sorted by 3byte opcode */
>>>> +#define ENTRY_3TO4(_opcode)    { _opcode, _opcode##_4B }
>>>> +       static const struct spi_nor_address_entry spi_nor_3to4_table[] = {
>>>> +               ENTRY_3TO4(SPINOR_OP_PP),               /* 0x02 */
>>>> +               ENTRY_3TO4(SPINOR_OP_READ),             /* 0x03 */
>>>> +               ENTRY_3TO4(SPINOR_OP_READ_FAST),        /* 0x0b */
>>>> +               ENTRY_3TO4(SPINOR_OP_BE_4K),            /* 0x20 */
>>>> +               ENTRY_3TO4(SPINOR_OP_PP_1_1_4),         /* 0x32 */
>>>> +               ENTRY_3TO4(SPINOR_OP_PP_1_4_4),         /* 0x38 */
>>>> +               ENTRY_3TO4(SPINOR_OP_READ_1_1_2),       /* 0x3b */
>>>> +               ENTRY_3TO4(SPINOR_OP_BE_32K),           /* 0x52 */
>>>> +               ENTRY_3TO4(SPINOR_OP_READ_1_1_4),       /* 0x6b */
>>>> +               ENTRY_3TO4(SPINOR_OP_READ_1_2_2),       /* 0xbb */
>>>> +               ENTRY_3TO4(SPINOR_OP_SE),               /* 0xd8 */
>>>> +               ENTRY_3TO4(SPINOR_OP_READ_1_4_4),       /* 0xeb */
>>>> +       };
>>>> +#undef ENTRY_3TO4
>>>> +
>>>> +       return spi_nor_convert_opcode(opcode, spi_nor_3to4_table,
>>>> +                                     ARRAY_SIZE(spi_nor_3to4_table));
>>>> +}
>>>> +
>>>> +static void spi_nor_set_4byte_opcodes(struct spi_nor *nor,
>>>> +                                     const struct flash_info *info)
>>>> +{
>>>> +       /* Do some manufacturer fixups first */
>>>> +       switch (JEDEC_MFR(info)) {
>>>> +       case SNOR_MFR_SPANSION:
>>>> +               /* No small sector erase for 4-byte command set */
>>>> +               nor->erase_opcode = SPINOR_OP_SE;
>>>> +               nor->mtd.erasesize = info->sector_size;
>>>> +               break;
>>>> +
>>>> +       default:
>>>> +               break;
>>>> +       }
>>>> +
>>>> +       nor->read_opcode        = spi_nor_3to4_opcode(nor->read_opcode);
>>>> +       nor->program_opcode     = spi_nor_3to4_opcode(nor->program_opcode);
>>>> +       nor->erase_opcode       = spi_nor_3to4_opcode(nor->erase_opcode);
>>>> +}
>>>> +
>>>>  /* Enable/disable 4-byte addressing mode. */
>>>>  static inline int set_4byte(struct spi_nor *nor, const struct flash_info *info,
>>>>                             int enable)
>>>> @@ -1476,27 +1555,10 @@ int spi_nor_scan(struct spi_nor *nor, const char *name, enum read_mode mode)
>>>>         else if (mtd->size > 0x1000000) {
>>>>                 /* enable 4-byte addressing if the device exceeds 16MiB */
>>>>                 nor->addr_width = 4;
>>>> -               if (JEDEC_MFR(info) == SNOR_MFR_SPANSION) {
>>>> -                       /* Dedicated 4-byte command set */
>>>> -                       switch (nor->flash_read) {
>>>> -                       case SPI_NOR_QUAD:
>>>> -                               nor->read_opcode = SPINOR_OP_READ4_1_1_4;
>>>> -                               break;
>>>> -                       case SPI_NOR_DUAL:
>>>> -                               nor->read_opcode = SPINOR_OP_READ4_1_1_2;
>>>> -                               break;
>>>> -                       case SPI_NOR_FAST:
>>>> -                               nor->read_opcode = SPINOR_OP_READ4_FAST;
>>>> -                               break;
>>>> -                       case SPI_NOR_NORMAL:
>>>> -                               nor->read_opcode = SPINOR_OP_READ4;
>>>> -                               break;
>>>> -                       }
>>>> -                       nor->program_opcode = SPINOR_OP_PP_4B;
>>>> -                       /* No small sector erase for 4-byte command set */
>>>> -                       nor->erase_opcode = SPINOR_OP_SE_4B;
>>>> -                       mtd->erasesize = info->sector_size;
>>>> -               } else
>>>> +               if (JEDEC_MFR(info) == SNOR_MFR_SPANSION ||
>>>> +                   info->flags & SPI_NOR_4B_OPCODES)
>>>> +                       spi_nor_set_4byte_opcodes(nor, info);
>>>
>>> I am giving my inputs based on the discussion on this thread[1].
>>>
>>> Seems like winbond[2], stmicron, spansion look better way or equally
>>> same for accessing 4-byte addressing commands. and I find few of the
>>> Macronix [3] have support of 4B addressing(see Table 5) but
>>> lack/unable to find the 4B opcodes.
>>>
>>
>> The Macronix mx25l25635e has no 4-byte address op codes. Instead you can
>> use the EN4B (enter 4-byte mode) B7h op code to make the memory enter its
>> 4-byte mode: hence you still write one of the 3-byte address op code but now
>> this op code is followed by a 4-byte address.
>> Currently the spi-nor framework uses this EN4B op code for all but Spansion
>> memories. However entering this 4-byte mode is statefull.
>> For the Macronix 35e won't be able to use the 4-byte address instruction set
>> and we will keep on entering the 4-byte mode.
>>
>> The idea behind the patch is to use the 4-byte address instruction set when
>> we are absolutely sure this set is supported by a given memory but keep the
>> current behaviour for other memories.
>>
>>> And about BAR support, based on my experience in u-boot and research
>>> on above chips only require when controller isn't supporting 4-byte
>>> addressing even if connected flash chip has > 16MiB, that means there
>>> is no exact or equivalent requirement for flash side either.
>>>
>>> So, adding the flags on flash table might be the good option instead
>>> making code to convert 3B opcode to 4B because anyway the chips
>>> require SPI_NOR_4B_OPCODES and also except winbond, stmicron, spansion
>>> not too many flash needed > 16MiB support as of now.
>>>
>>
>> Sorry but I don't understand what you mean or suggest here!
> 
> OK, What I am trying to say here is except the Macronix reaming chips
> - Winbond, Stmicron, Spansion has a similar way of opcode handling. So

Be careful about Micron memories too! many part numbers share the very same
entry in the spi_nor_ids[] array but some of them don't support the Page
4-byte address Program 1-1-4; the op code should be 12h.

For instance, with n25q512* memories about the 3-byte address:
"The code 38h is only valid for line items that enable the additional RESET#
pin; otherwise, code 12h is valid."

n25q512a8* parts have the additional RESET# pin:
- 4-byte address Page Program 1-1-1: 12h
- 3-byte address Page Program x-4-4: 38h

n25q512a1* parts don't have the additional RESET# pin:
- 4-byte address Page Program 1-1-1: N/A => entering the 4-byte mode is still
                                            needed here.
- 3-byte address Page Program x-4-4: 12h

> why can't we add the flags for supporting chips instead of 3B_to_4B
Which flag do you refer to?
The SPI_NOR_4B_OPCODES flag I've proposed in my patch is to enable the op
code conversion for a given memory when we know all parts handled by a single
spi_nor_ids[] entry support the 4-byte address instruction set.

If you think the conversion is useless, I don't understand what flag you
suggest to use instead.

> conversion I'm thinking this conversion of opcodes not much helpful
> here as we dealing only few vendor chips and also not adequate for all
> scenarios.
> 
Currently, a conversion is already done for Spansion memories. The conversion
is done for (Fast) Read op codes by a switch(nor->flash_read) statement.
Also for Page Program operations, currently only the SPI 1-1-1 is supported
so the spi-nor framework always use the SPINOR_OP_PP_4B op code.

My patch simply helps translating more op codes since further patches in the
series add support to more SPI protocols, hence more op code are needed.

> thanks!
>