Linux-mtd Archive on lore.kernel.org
 help / color / Atom feed
* [PATCH v11 00/14] mtd: spi-nor: add xSPI Octal DTR support
@ 2020-07-23 13:11 Pratyush Yadav
  2020-07-23 13:11 ` [PATCH v11 01/14] mtd: spi-nor: core: add spi_nor_{read, write}_reg() helpers Pratyush Yadav
                   ` (13 more replies)
  0 siblings, 14 replies; 15+ messages in thread
From: Pratyush Yadav @ 2020-07-23 13:11 UTC (permalink / raw)
  To: Tudor Ambarus, Miquel Raynal, Richard Weinberger,
	Vignesh Raghavendra, linux-mtd, linux-kernel
  Cc: Pratyush Yadav, Boris Brezillon, Sekhar Nori, Pratyush Yadav

From: Pratyush Yadav <p.yadav@ti.com>

[I am facing some technical problems in accessing my work email which
might take some time to resolve. I want to see this series get merged in
v5.9-rc1 so I am using my personal email to send it.]

Hi,

This series adds support for octal DTR flashes in the spi-nor framework,
and then adds hooks for the Cypress Semper and Mircon Xcella flashes to
allow running them in octal DTR mode. This series assumes that the flash
is handed to the kernel in Legacy SPI mode.

Tested on TI J721e EVM with 1-bit ECC on the Cypress flash.

Changes in v11:
- Add helpers spi_nor_{read,write}_reg() to make it easier to reject DTR
  ops for them.

- Add helper for spi_nor_controller_ops_erase() to make it easier to
  reject DTR ops.

- s/spi-mem/SPIMEM/ and s/spi-nor/SPI NOR/

- Avoid enabling 4-byte addressing mode for all DTR ops instead of just
  Octal DTR ops. This is based on the assumption that DTR ops can only
  use 4-byte addressing.

- Use round_up() instead of defining ROUND_UP_TO().

- Rename 'table' to 'dwords' in xSPI Profile 1.0 parsing.

- Re-order Profile 1.0 related defines by DWORD order.

- Move rdsr parameter parsing to where opcode is parsed because it is
  from the same DWORD.

- Drop local variables addr_width and dummy in spi_nor_read_sr()
  spi_nor_read_fsr().

- Allow soft reset for all protocols, not just 8D-8D-8D.

- Do not set address value to 0 is spi_nor_read_sr() and
  spi_nor_read_fsr(). It is 0 by default when we create the op.

- Do not make having command opcode extension as a reserved field fatal.

- Introduce the flag SPI_NOR_OCTAL_DTR_PP to indicate 8D page program
  support since it can't be detected from SFDP.

- Move the call to spi_nor_spimem_setup_op() in spi_nor_read_sr() to the
  commit which introduces it.

- Convert a comment in Profile 1.0 parsing from multi-line to one line.

Changes in v10:
- Rebase on latest linux-next/master. Drop a couple patches that made it
  in the  previous release.

- Move the code that sets 20 dummy cycles for MT35XU512ABA to its octal
  enable function. This way, if the controller doesn't support 8D mode
  20 dummy cycles won't be used.

Changes in v9:
- Do not use '& 0xff' to get the opcode LSB in spi-mxic and
  spi-zynq-qspi. The cast to u8 will do that anyway.

- Do not use if (opcode) as a check for whether the command phase exists
  in spi-zynq-qspi because the opcode 0 can be valid. Use the new
  cmd.nbytes instead.

Changes in v8:
- Move controller changes in spi-mxic to the commit which introduces
  2-byte opcodes to avoid problems when bisecting.

- Replace usage of sizeof(op->cmd.opcode) with op->cmd.nbytes.

- Extract opcode in spi-zynq-qspi instead of using &op->cmd.opcode.

Changes in v7:
- Reject ops with more than 1 command byte in
  spi_mem_default_supports_op().

- Reject ops with more than 1 command byte in atmel and mtk controllers.

- Reject ops with 0 command bytes in spi_mem_check_op().

- Set cmd.nbytes to 1 when using SPI_MEM_OP_CMD().

- Avoid endianness problems in spi-mxic.

Changes in v6:
- Instead of hard-coding 8D-8D-8D Fast Read dummy cycles to 20, find
  them out from the Profile 1.0 table.

Changes in v5:
- Do not enable stateful X-X-X modes if the reset line is broken.

- Instead of setting SNOR_READ_HWCAPS_8_8_8_DTR from Profile 1.0 table
  parsing, do it in spi_nor_info_init_params() instead based on the
  SPI_NOR_OCTAL_DTR_READ flag instead.

- Set SNOR_HWCAPS_PP_8_8_8_DTR in s28hs post_sfdp hook since this
  capability is no longer set in Profile 1.0 parsing.

- Instead of just checking for spi_nor_get_protocol_width() in
  spi_nor_octal_dtr_enable(), make sure the protocol is
  SNOR_PROTO_8_8_8_DTR since get_protocol_width() only cares about data
  width.

- Drop flag SPI_NOR_SOFT_RESET. Instead, discover soft reset capability
  via BFPT.

- Do not make an invalid Quad Enable BFPT field a fatal error. Silently
  ignore it by assuming no quad enable bit is present.

- Set dummy cycles for Cypress Semper flash to 24 instead of 20. This
  allows for 200MHz operation in 8D mode compared to the 166MHz with 20.

- Rename spi_nor_cypress_octal_enable() to
  spi_nor_cypress_octal_dtr_enable().

- Update spi-mtk-nor.c to reject DTR ops since it doesn't call
  spi_mem_default_supports_op().

Changes in v4:
- Refactor the series to use the new spi-nor framework with the
  manufacturer-specific bits separated from the core.

- Add support for Micron MT35XU512ABA.

- Use cmd.nbytes as the criteria of whether the data phase exists or not
  instead of cmd.buf.in || cmd.buf.out in spi_nor_spimem_setup_op().

- Update Read FSR to use the same dummy cycles and address width as Read
  SR.

- Fix BFPT parsing stopping too early for JESD216 rev B flashes.

- Use 2 byte reads for Read SR and FSR commands in DTR mode.

Changes in v3:
- Drop the DT properties "spi-rx-dtr" and "spi-tx-dtr". Instead, if
  later a need is felt to disable DTR in case someone has a board with
  Octal DTR capable flash but does not support DTR transactions for some
  reason, a property like "spi-no-dtr" can be added.

- Remove mode bits SPI_RX_DTR and SPI_TX_DTR.

- Remove the Cadence Quadspi controller patch to un-block this series. I
  will submit it as a separate patch.

- Rebase on latest 'master' and fix merge conflicts.

- Update read and write dirmap templates to use DTR.

- Rename 'is_dtr' to 'dtr'.

- Make 'dtr' a bitfield.

- Reject DTR ops in spi_mem_default_supports_op().

- Update atmel-quadspi to reject DTR ops. All other controller drivers
  call spi_mem_default_supports_op() so they will automatically reject
  DTR ops.

- Add support for both enabling and disabling DTR modes.

- Perform a Software Reset on flashes that support it when shutting
  down.

- Disable Octal DTR mode on suspend, and re-enable it on resume.

- Drop enum 'spi_mem_cmd_ext' and make command opcode u16 instead.
  Update spi-nor to use the 2-byte command instead of the command
  extension. Since we still need a "extension type", mode that enum to
  spi-nor and name it 'spi_nor_cmd_ext'.

- Default variable address width to 3 to fix SMPT parsing.

- Drop non-volatile change to uniform sector mode and rely on parsing
  SMPT.

Changes in v2:
- Add DT properties "spi-rx-dtr" and "spi-tx-dtr" to allow expressing
  DTR capabilities.

- Set the mode bits SPI_RX_DTR and SPI_TX_DTR when we discover the DT
  properties "spi-rx-dtr" and spi-tx-dtr".

- spi_nor_cypress_octal_enable() was updating nor->params.read[] with
  the intention of setting the correct number of dummy cycles. But this
  function is called _after_ selecting the read so setting
  nor->params.read[] will have no effect. So, update nor->read_dummy
  directly.

- Fix spi_nor_spimem_check_readop() and spi_nor_spimem_check_pp()
  passing nor->read_proto and nor->write_proto to
  spi_nor_spimem_setup_op() instead of read->proto and pp->proto
  respectively.

- Move the call to cqspi_setup_opcode_ext() inside cqspi_enable_dtr().
  This avoids repeating the 'if (f_pdata->is_dtr)
  cqspi_setup_opcode_ext()...` snippet multiple times.

- Call the default 'supports_op()' from cqspi_supports_mem_op(). This
  makes sure the buswidth requirements are also enforced along with the
  DTR requirements.

- Drop the 'is_dtr' argument from spi_check_dtr_req(). We only call it
  when a phase is DTR so it is redundant.

Pratyush Yadav (14):
  mtd: spi-nor: core: add spi_nor_{read,write}_reg() helpers
  mtd: spi-nor: core: add spi_nor_controller_ops_erase helper
  mtd: spi-nor: add support for DTR protocol
  mtd: spi-nor: sfdp: get command opcode extension type from BFPT
  mtd: spi-nor: sfdp: parse xSPI Profile 1.0 table
  mtd: spi-nor: core: use dummy cycle and address width info from SFDP
  mtd: spi-nor: core: do 2 byte reads for SR and FSR in DTR mode
  mtd: spi-nor: core: enable octal DTR mode when possible
  mtd: spi-nor: sfdp: detect Soft Reset sequence support from BFPT
  mtd: spi-nor: core: perform a Soft Reset on shutdown
  mtd: spi-nor: core: disable Octal DTR mode on suspend.
  mtd: spi-nor: core: expose spi_nor_default_setup() in core.h
  mtd: spi-nor: spansion: add support for Cypress Semper flash
  mtd: spi-nor: micron-st: allow using MT35XU512ABA in Octal DTR mode

 drivers/mtd/spi-nor/core.c      | 450 ++++++++++++++++++++++++--------
 drivers/mtd/spi-nor/core.h      |  23 ++
 drivers/mtd/spi-nor/micron-st.c | 102 +++++++-
 drivers/mtd/spi-nor/sfdp.c      | 122 ++++++++-
 drivers/mtd/spi-nor/sfdp.h      |   8 +
 drivers/mtd/spi-nor/spansion.c  | 165 ++++++++++++
 include/linux/mtd/spi-nor.h     |  53 +++-
 7 files changed, 805 insertions(+), 118 deletions(-)

--
2.27.0


______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/

^ permalink raw reply	[flat|nested] 15+ messages in thread

* [PATCH v11 01/14] mtd: spi-nor: core: add spi_nor_{read, write}_reg() helpers
  2020-07-23 13:11 [PATCH v11 00/14] mtd: spi-nor: add xSPI Octal DTR support Pratyush Yadav
@ 2020-07-23 13:11 ` Pratyush Yadav
  2020-07-23 13:11 ` [PATCH v11 02/14] mtd: spi-nor: core: add spi_nor_controller_ops_erase helper Pratyush Yadav
                   ` (12 subsequent siblings)
  13 siblings, 0 replies; 15+ messages in thread
From: Pratyush Yadav @ 2020-07-23 13:11 UTC (permalink / raw)
  To: Tudor Ambarus, Miquel Raynal, Richard Weinberger,
	Vignesh Raghavendra, linux-mtd, linux-kernel
  Cc: Pratyush Yadav, Boris Brezillon, Sekhar Nori, Pratyush Yadav

From: Pratyush Yadav <p.yadav@ti.com>

They are thin wrappers around nor->controller_ops->{read,write}_reg().
In a future commit DTR support will be added. These ops can not be
supported by the {read,write}_reg() hooks and these helpers will make it
easier to reject those calls.

Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
---
 drivers/mtd/spi-nor/core.c | 110 ++++++++++++++++---------------------
 1 file changed, 47 insertions(+), 63 deletions(-)

diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
index 65eff4ce6ab1..2ccf2c154779 100644
--- a/drivers/mtd/spi-nor/core.c
+++ b/drivers/mtd/spi-nor/core.c
@@ -82,6 +82,18 @@ static int spi_nor_spimem_exec_op(struct spi_nor *nor, struct spi_mem_op *op)
 	return spi_mem_exec_op(nor->spimem, op);
 }
 
+static int spi_nor_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf,
+			    size_t len)
+{
+	return nor->controller_ops->read_reg(nor, opcode, buf, len);
+}
+
+static int spi_nor_write_reg(struct spi_nor *nor, u8 opcode, const u8 *buf,
+			     size_t len)
+{
+	return nor->controller_ops->write_reg(nor, opcode, buf, len);
+}
+
 /**
  * spi_nor_spimem_read_data() - read data from flash's memory region via
  *                              spi-mem
@@ -228,10 +240,8 @@ int spi_nor_write_enable(struct spi_nor *nor)
 				   SPI_MEM_OP_NO_DATA);
 
 		ret = spi_mem_exec_op(nor->spimem, &op);
-	} else {
-		ret = nor->controller_ops->write_reg(nor, SPINOR_OP_WREN,
-						     NULL, 0);
-	}
+	} else
+		ret = spi_nor_write_reg(nor, SPINOR_OP_WREN, NULL, 0);
 
 	if (ret)
 		dev_dbg(nor->dev, "error %d on Write Enable\n", ret);
@@ -257,10 +267,8 @@ int spi_nor_write_disable(struct spi_nor *nor)
 				   SPI_MEM_OP_NO_DATA);
 
 		ret = spi_mem_exec_op(nor->spimem, &op);
-	} else {
-		ret = nor->controller_ops->write_reg(nor, SPINOR_OP_WRDI,
-						     NULL, 0);
-	}
+	} else
+		ret = spi_nor_write_reg(nor, SPINOR_OP_WRDI, NULL, 0);
 
 	if (ret)
 		dev_dbg(nor->dev, "error %d on Write Disable\n", ret);
@@ -288,10 +296,8 @@ static int spi_nor_read_sr(struct spi_nor *nor, u8 *sr)
 				   SPI_MEM_OP_DATA_IN(1, sr, 1));
 
 		ret = spi_mem_exec_op(nor->spimem, &op);
-	} else {
-		ret = nor->controller_ops->read_reg(nor, SPINOR_OP_RDSR,
-						    sr, 1);
-	}
+	} else
+		ret = spi_nor_read_reg(nor, SPINOR_OP_RDSR, sr, 1);
 
 	if (ret)
 		dev_dbg(nor->dev, "error %d reading SR\n", ret);
@@ -319,10 +325,8 @@ static int spi_nor_read_fsr(struct spi_nor *nor, u8 *fsr)
 				   SPI_MEM_OP_DATA_IN(1, fsr, 1));
 
 		ret = spi_mem_exec_op(nor->spimem, &op);
-	} else {
-		ret = nor->controller_ops->read_reg(nor, SPINOR_OP_RDFSR,
-						    fsr, 1);
-	}
+	} else
+		ret = spi_nor_read_reg(nor, SPINOR_OP_RDFSR, fsr, 1);
 
 	if (ret)
 		dev_dbg(nor->dev, "error %d reading FSR\n", ret);
@@ -351,9 +355,8 @@ static int spi_nor_read_cr(struct spi_nor *nor, u8 *cr)
 				   SPI_MEM_OP_DATA_IN(1, cr, 1));
 
 		ret = spi_mem_exec_op(nor->spimem, &op);
-	} else {
-		ret = nor->controller_ops->read_reg(nor, SPINOR_OP_RDCR, cr, 1);
-	}
+	} else
+		ret = spi_nor_read_reg(nor, SPINOR_OP_RDCR, cr, 1);
 
 	if (ret)
 		dev_dbg(nor->dev, "error %d reading CR\n", ret);
@@ -384,12 +387,11 @@ int spi_nor_set_4byte_addr_mode(struct spi_nor *nor, bool enable)
 				  SPI_MEM_OP_NO_DATA);
 
 		ret = spi_mem_exec_op(nor->spimem, &op);
-	} else {
-		ret = nor->controller_ops->write_reg(nor,
-						     enable ? SPINOR_OP_EN4B :
-							      SPINOR_OP_EX4B,
-						     NULL, 0);
-	}
+	} else
+		ret = spi_nor_write_reg(nor,
+					enable ? SPINOR_OP_EN4B :
+						 SPINOR_OP_EX4B,
+					NULL, 0);
 
 	if (ret)
 		dev_dbg(nor->dev, "error %d setting 4-byte mode\n", ret);
@@ -420,10 +422,8 @@ static int spansion_set_4byte_addr_mode(struct spi_nor *nor, bool enable)
 				   SPI_MEM_OP_DATA_OUT(1, nor->bouncebuf, 1));
 
 		ret = spi_mem_exec_op(nor->spimem, &op);
-	} else {
-		ret = nor->controller_ops->write_reg(nor, SPINOR_OP_BRWR,
-						     nor->bouncebuf, 1);
-	}
+	} else
+		ret = spi_nor_write_reg(nor, SPINOR_OP_BRWR, nor->bouncebuf, 1);
 
 	if (ret)
 		dev_dbg(nor->dev, "error %d setting 4-byte mode\n", ret);
@@ -452,10 +452,8 @@ int spi_nor_write_ear(struct spi_nor *nor, u8 ear)
 				   SPI_MEM_OP_DATA_OUT(1, nor->bouncebuf, 1));
 
 		ret = spi_mem_exec_op(nor->spimem, &op);
-	} else {
-		ret = nor->controller_ops->write_reg(nor, SPINOR_OP_WREAR,
-						     nor->bouncebuf, 1);
-	}
+	} else
+		ret = spi_nor_write_reg(nor, SPINOR_OP_WREAR, nor->bouncebuf, 1);
 
 	if (ret)
 		dev_dbg(nor->dev, "error %d writing EAR\n", ret);
@@ -483,10 +481,8 @@ int spi_nor_xread_sr(struct spi_nor *nor, u8 *sr)
 				   SPI_MEM_OP_DATA_IN(1, sr, 1));
 
 		ret = spi_mem_exec_op(nor->spimem, &op);
-	} else {
-		ret = nor->controller_ops->read_reg(nor, SPINOR_OP_XRDSR,
-						    sr, 1);
-	}
+	} else
+		ret = spi_nor_read_reg(nor, SPINOR_OP_XRDSR, sr, 1);
 
 	if (ret)
 		dev_dbg(nor->dev, "error %d reading XRDSR\n", ret);
@@ -528,10 +524,8 @@ static void spi_nor_clear_sr(struct spi_nor *nor)
 				   SPI_MEM_OP_NO_DATA);
 
 		ret = spi_mem_exec_op(nor->spimem, &op);
-	} else {
-		ret = nor->controller_ops->write_reg(nor, SPINOR_OP_CLSR,
-						     NULL, 0);
-	}
+	} else
+		ret = spi_nor_write_reg(nor, SPINOR_OP_CLSR, NULL, 0);
 
 	if (ret)
 		dev_dbg(nor->dev, "error %d clearing SR\n", ret);
@@ -592,10 +586,8 @@ static void spi_nor_clear_fsr(struct spi_nor *nor)
 				   SPI_MEM_OP_NO_DATA);
 
 		ret = spi_mem_exec_op(nor->spimem, &op);
-	} else {
-		ret = nor->controller_ops->write_reg(nor, SPINOR_OP_CLFSR,
-						     NULL, 0);
-	}
+	} else
+		ret = spi_nor_write_reg(nor, SPINOR_OP_CLFSR, NULL, 0);
 
 	if (ret)
 		dev_dbg(nor->dev, "error %d clearing FSR\n", ret);
@@ -736,10 +728,8 @@ static int spi_nor_write_sr(struct spi_nor *nor, const u8 *sr, size_t len)
 				   SPI_MEM_OP_DATA_OUT(len, sr, 1));
 
 		ret = spi_mem_exec_op(nor->spimem, &op);
-	} else {
-		ret = nor->controller_ops->write_reg(nor, SPINOR_OP_WRSR,
-						     sr, len);
-	}
+	} else
+		ret = spi_nor_write_reg(nor, SPINOR_OP_WRSR, sr, len);
 
 	if (ret) {
 		dev_dbg(nor->dev, "error %d writing SR\n", ret);
@@ -938,10 +928,8 @@ static int spi_nor_write_sr2(struct spi_nor *nor, const u8 *sr2)
 				   SPI_MEM_OP_DATA_OUT(1, sr2, 1));
 
 		ret = spi_mem_exec_op(nor->spimem, &op);
-	} else {
-		ret = nor->controller_ops->write_reg(nor, SPINOR_OP_WRSR2,
-						     sr2, 1);
-	}
+	} else
+		ret = spi_nor_write_reg(nor, SPINOR_OP_WRSR2, sr2, 1);
 
 	if (ret) {
 		dev_dbg(nor->dev, "error %d writing SR2\n", ret);
@@ -972,10 +960,8 @@ static int spi_nor_read_sr2(struct spi_nor *nor, u8 *sr2)
 				   SPI_MEM_OP_DATA_IN(1, sr2, 1));
 
 		ret = spi_mem_exec_op(nor->spimem, &op);
-	} else {
-		ret = nor->controller_ops->read_reg(nor, SPINOR_OP_RDSR2,
-						    sr2, 1);
-	}
+	} else
+		ret = spi_nor_read_reg(nor, SPINOR_OP_RDSR2, sr2, 1);
 
 	if (ret)
 		dev_dbg(nor->dev, "error %d reading SR2\n", ret);
@@ -1003,10 +989,8 @@ static int spi_nor_erase_chip(struct spi_nor *nor)
 				   SPI_MEM_OP_NO_DATA);
 
 		ret = spi_mem_exec_op(nor->spimem, &op);
-	} else {
-		ret = nor->controller_ops->write_reg(nor, SPINOR_OP_CHIP_ERASE,
-						     NULL, 0);
-	}
+	} else
+		ret = spi_nor_write_reg(nor, SPINOR_OP_CHIP_ERASE, NULL, 0);
 
 	if (ret)
 		dev_dbg(nor->dev, "error %d erasing chip\n", ret);
@@ -1158,8 +1142,8 @@ static int spi_nor_erase_sector(struct spi_nor *nor, u32 addr)
 		addr >>= 8;
 	}
 
-	return nor->controller_ops->write_reg(nor, nor->erase_opcode,
-					      nor->bouncebuf, nor->addr_width);
+	return spi_nor_write_reg(nor, nor->erase_opcode, nor->bouncebuf,
+				 nor->addr_width);
 }
 
 /**
-- 
2.27.0


______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/

^ permalink raw reply	[flat|nested] 15+ messages in thread

* [PATCH v11 02/14] mtd: spi-nor: core: add spi_nor_controller_ops_erase helper
  2020-07-23 13:11 [PATCH v11 00/14] mtd: spi-nor: add xSPI Octal DTR support Pratyush Yadav
  2020-07-23 13:11 ` [PATCH v11 01/14] mtd: spi-nor: core: add spi_nor_{read, write}_reg() helpers Pratyush Yadav
@ 2020-07-23 13:11 ` Pratyush Yadav
  2020-07-23 13:11 ` [PATCH v11 03/14] mtd: spi-nor: add support for DTR protocol Pratyush Yadav
                   ` (11 subsequent siblings)
  13 siblings, 0 replies; 15+ messages in thread
From: Pratyush Yadav @ 2020-07-23 13:11 UTC (permalink / raw)
  To: Tudor Ambarus, Miquel Raynal, Richard Weinberger,
	Vignesh Raghavendra, linux-mtd, linux-kernel
  Cc: Pratyush Yadav, Boris Brezillon, Sekhar Nori, Pratyush Yadav

From: Pratyush Yadav <p.yadav@ti.com>

It is a thin wrapper around nor->controller_ops->erase(). In a future
commit DTR support will be added. These ops can not be supported by the
erase() hook and this helper will make it easier to reject those calls.

Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
---
 drivers/mtd/spi-nor/core.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
index 2ccf2c154779..4a7443e00602 100644
--- a/drivers/mtd/spi-nor/core.c
+++ b/drivers/mtd/spi-nor/core.c
@@ -94,6 +94,11 @@ static int spi_nor_write_reg(struct spi_nor *nor, u8 opcode, const u8 *buf,
 	return nor->controller_ops->write_reg(nor, opcode, buf, len);
 }
 
+static int spi_nor_controller_ops_erase(struct spi_nor *nor, loff_t offs)
+{
+	return nor->controller_ops->erase(nor, offs);
+}
+
 /**
  * spi_nor_spimem_read_data() - read data from flash's memory region via
  *                              spi-mem
@@ -1130,7 +1135,7 @@ static int spi_nor_erase_sector(struct spi_nor *nor, u32 addr)
 
 		return spi_mem_exec_op(nor->spimem, &op);
 	} else if (nor->controller_ops->erase) {
-		return nor->controller_ops->erase(nor, addr);
+		return spi_nor_controller_ops_erase(nor, addr);
 	}
 
 	/*
-- 
2.27.0


______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/

^ permalink raw reply	[flat|nested] 15+ messages in thread

* [PATCH v11 03/14] mtd: spi-nor: add support for DTR protocol
  2020-07-23 13:11 [PATCH v11 00/14] mtd: spi-nor: add xSPI Octal DTR support Pratyush Yadav
  2020-07-23 13:11 ` [PATCH v11 01/14] mtd: spi-nor: core: add spi_nor_{read, write}_reg() helpers Pratyush Yadav
  2020-07-23 13:11 ` [PATCH v11 02/14] mtd: spi-nor: core: add spi_nor_controller_ops_erase helper Pratyush Yadav
@ 2020-07-23 13:11 ` Pratyush Yadav
  2020-07-23 13:11 ` [PATCH v11 04/14] mtd: spi-nor: sfdp: get command opcode extension type from BFPT Pratyush Yadav
                   ` (10 subsequent siblings)
  13 siblings, 0 replies; 15+ messages in thread
From: Pratyush Yadav @ 2020-07-23 13:11 UTC (permalink / raw)
  To: Tudor Ambarus, Miquel Raynal, Richard Weinberger,
	Vignesh Raghavendra, linux-mtd, linux-kernel
  Cc: Pratyush Yadav, Boris Brezillon, Sekhar Nori, Pratyush Yadav

From: Pratyush Yadav <p.yadav@ti.com>

Double Transfer Rate (DTR) is SPI protocol in which data is transferred
on each clock edge as opposed to on each clock cycle. Make
framework-level changes to allow supporting flashes in DTR mode.

Right now, mixed DTR modes are not supported. So, for example a mode
like 4S-4D-4D will not work. All phases need to be either DTR or STR.

Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
---
 drivers/mtd/spi-nor/core.c  | 208 ++++++++++++++++++++++++++++++------
 drivers/mtd/spi-nor/core.h  |   7 ++
 drivers/mtd/spi-nor/sfdp.c  |   9 +-
 include/linux/mtd/spi-nor.h |  51 ++++++---
 4 files changed, 227 insertions(+), 48 deletions(-)

diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
index 4a7443e00602..87f82bc8f014 100644
--- a/drivers/mtd/spi-nor/core.c
+++ b/drivers/mtd/spi-nor/core.c
@@ -40,6 +40,76 @@
 
 #define SPI_NOR_MAX_ADDR_WIDTH	4
 
+/**
+ * spi_nor_get_cmd_ext() - Get the command opcode extension based on the
+ *			   extension type.
+ * @nor:		pointer to a 'struct spi_nor'
+ * @op:			pointer to the 'struct spi_mem_op' whose properties
+ *			need to be initialized.
+ *
+ * Right now, only "repeat" and "invert" are supported.
+ *
+ * Return: The opcode extension.
+ */
+static u8 spi_nor_get_cmd_ext(const struct spi_nor *nor,
+			      const struct spi_mem_op *op)
+{
+	switch (nor->cmd_ext_type) {
+	case SPI_NOR_EXT_INVERT:
+		return ~op->cmd.opcode;
+
+	case SPI_NOR_EXT_REPEAT:
+		return op->cmd.opcode;
+
+	default:
+		dev_err(nor->dev, "Unknown command extension type\n");
+		return 0;
+	}
+}
+
+/**
+ * spi_nor_spimem_setup_op() - Set up common properties of a spi-mem op.
+ * @nor:		pointer to a 'struct spi_nor'
+ * @op:			pointer to the 'struct spi_mem_op' whose properties
+ *			need to be initialized.
+ * @proto:		the protocol from which the properties need to be set.
+ */
+void spi_nor_spimem_setup_op(const struct spi_nor *nor,
+			     struct spi_mem_op *op,
+			     const enum spi_nor_protocol proto)
+{
+	u8 ext;
+
+	op->cmd.buswidth = spi_nor_get_protocol_inst_nbits(proto);
+
+	if (op->addr.nbytes)
+		op->addr.buswidth = spi_nor_get_protocol_addr_nbits(proto);
+
+	if (op->dummy.nbytes)
+		op->dummy.buswidth = spi_nor_get_protocol_addr_nbits(proto);
+
+	if (op->data.nbytes)
+		op->data.buswidth = spi_nor_get_protocol_data_nbits(proto);
+
+	if (spi_nor_protocol_is_dtr(proto)) {
+		/*
+		 * SPIMEM supports mixed DTR modes, but right now we can only
+		 * have all phases either DTR or STR. IOW, SPIMEM can have
+		 * something like 4S-4D-4D, but SPI NOR can't. So, set all 4
+		 * phases to either DTR or STR.
+		 */
+		op->cmd.dtr = op->addr.dtr = op->dummy.dtr
+			       = op->data.dtr = true;
+
+		/* 2 bytes per clock cycle in DTR mode. */
+		op->dummy.nbytes *= 2;
+
+		ext = spi_nor_get_cmd_ext(nor, op);
+		op->cmd.opcode = (op->cmd.opcode << 8) | ext;
+		op->cmd.nbytes = 2;
+	}
+}
+
 /**
  * spi_nor_spimem_bounce() - check if a bounce buffer is needed for the data
  *                           transfer
@@ -85,17 +155,26 @@ static int spi_nor_spimem_exec_op(struct spi_nor *nor, struct spi_mem_op *op)
 static int spi_nor_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf,
 			    size_t len)
 {
+	if (spi_nor_protocol_is_dtr(nor->reg_proto))
+		return -ENOTSUPP;
+
 	return nor->controller_ops->read_reg(nor, opcode, buf, len);
 }
 
 static int spi_nor_write_reg(struct spi_nor *nor, u8 opcode, const u8 *buf,
 			     size_t len)
 {
+	if (spi_nor_protocol_is_dtr(nor->reg_proto))
+		return -ENOTSUPP;
+
 	return nor->controller_ops->write_reg(nor, opcode, buf, len);
 }
 
 static int spi_nor_controller_ops_erase(struct spi_nor *nor, loff_t offs)
 {
+	if (spi_nor_protocol_is_dtr(nor->write_proto))
+		return -ENOTSUPP;
+
 	return nor->controller_ops->erase(nor, offs);
 }
 
@@ -121,14 +200,12 @@ static ssize_t spi_nor_spimem_read_data(struct spi_nor *nor, loff_t from,
 	ssize_t nbytes;
 	int error;
 
-	/* get transfer protocols. */
-	op.cmd.buswidth = spi_nor_get_protocol_inst_nbits(nor->read_proto);
-	op.addr.buswidth = spi_nor_get_protocol_addr_nbits(nor->read_proto);
-	op.dummy.buswidth = op.addr.buswidth;
-	op.data.buswidth = spi_nor_get_protocol_data_nbits(nor->read_proto);
+	spi_nor_spimem_setup_op(nor, &op, nor->read_proto);
 
 	/* convert the dummy cycles to the number of bytes */
 	op.dummy.nbytes = (nor->read_dummy * op.dummy.buswidth) / 8;
+	if (spi_nor_protocol_is_dtr(nor->read_proto))
+		op.dummy.nbytes *= 2;
 
 	usebouncebuf = spi_nor_spimem_bounce(nor, &op);
 
@@ -186,13 +263,11 @@ static ssize_t spi_nor_spimem_write_data(struct spi_nor *nor, loff_t to,
 	ssize_t nbytes;
 	int error;
 
-	op.cmd.buswidth = spi_nor_get_protocol_inst_nbits(nor->write_proto);
-	op.addr.buswidth = spi_nor_get_protocol_addr_nbits(nor->write_proto);
-	op.data.buswidth = spi_nor_get_protocol_data_nbits(nor->write_proto);
-
 	if (nor->program_opcode == SPINOR_OP_AAI_WP && nor->sst_write_second)
 		op.addr.nbytes = 0;
 
+	spi_nor_spimem_setup_op(nor, &op, nor->write_proto);
+
 	if (spi_nor_spimem_bounce(nor, &op))
 		memcpy(nor->bouncebuf, buf, op.data.nbytes);
 
@@ -244,6 +319,8 @@ int spi_nor_write_enable(struct spi_nor *nor)
 				   SPI_MEM_OP_NO_DUMMY,
 				   SPI_MEM_OP_NO_DATA);
 
+		spi_nor_spimem_setup_op(nor, &op, nor->reg_proto);
+
 		ret = spi_mem_exec_op(nor->spimem, &op);
 	} else
 		ret = spi_nor_write_reg(nor, SPINOR_OP_WREN, NULL, 0);
@@ -271,6 +348,8 @@ int spi_nor_write_disable(struct spi_nor *nor)
 				   SPI_MEM_OP_NO_DUMMY,
 				   SPI_MEM_OP_NO_DATA);
 
+		spi_nor_spimem_setup_op(nor, &op, nor->reg_proto);
+
 		ret = spi_mem_exec_op(nor->spimem, &op);
 	} else
 		ret = spi_nor_write_reg(nor, SPINOR_OP_WRDI, NULL, 0);
@@ -300,6 +379,8 @@ static int spi_nor_read_sr(struct spi_nor *nor, u8 *sr)
 				   SPI_MEM_OP_NO_DUMMY,
 				   SPI_MEM_OP_DATA_IN(1, sr, 1));
 
+		spi_nor_spimem_setup_op(nor, &op, nor->reg_proto);
+
 		ret = spi_mem_exec_op(nor->spimem, &op);
 	} else
 		ret = spi_nor_read_reg(nor, SPINOR_OP_RDSR, sr, 1);
@@ -329,6 +410,8 @@ static int spi_nor_read_fsr(struct spi_nor *nor, u8 *fsr)
 				   SPI_MEM_OP_NO_DUMMY,
 				   SPI_MEM_OP_DATA_IN(1, fsr, 1));
 
+		spi_nor_spimem_setup_op(nor, &op, nor->reg_proto);
+
 		ret = spi_mem_exec_op(nor->spimem, &op);
 	} else
 		ret = spi_nor_read_reg(nor, SPINOR_OP_RDFSR, fsr, 1);
@@ -359,6 +442,8 @@ static int spi_nor_read_cr(struct spi_nor *nor, u8 *cr)
 				   SPI_MEM_OP_NO_DUMMY,
 				   SPI_MEM_OP_DATA_IN(1, cr, 1));
 
+		spi_nor_spimem_setup_op(nor, &op, nor->reg_proto);
+
 		ret = spi_mem_exec_op(nor->spimem, &op);
 	} else
 		ret = spi_nor_read_reg(nor, SPINOR_OP_RDCR, cr, 1);
@@ -391,6 +476,8 @@ int spi_nor_set_4byte_addr_mode(struct spi_nor *nor, bool enable)
 				  SPI_MEM_OP_NO_DUMMY,
 				  SPI_MEM_OP_NO_DATA);
 
+		spi_nor_spimem_setup_op(nor, &op, nor->reg_proto);
+
 		ret = spi_mem_exec_op(nor->spimem, &op);
 	} else
 		ret = spi_nor_write_reg(nor,
@@ -426,6 +513,8 @@ static int spansion_set_4byte_addr_mode(struct spi_nor *nor, bool enable)
 				   SPI_MEM_OP_NO_DUMMY,
 				   SPI_MEM_OP_DATA_OUT(1, nor->bouncebuf, 1));
 
+		spi_nor_spimem_setup_op(nor, &op, nor->reg_proto);
+
 		ret = spi_mem_exec_op(nor->spimem, &op);
 	} else
 		ret = spi_nor_write_reg(nor, SPINOR_OP_BRWR, nor->bouncebuf, 1);
@@ -456,6 +545,8 @@ int spi_nor_write_ear(struct spi_nor *nor, u8 ear)
 				   SPI_MEM_OP_NO_DUMMY,
 				   SPI_MEM_OP_DATA_OUT(1, nor->bouncebuf, 1));
 
+		spi_nor_spimem_setup_op(nor, &op, nor->reg_proto);
+
 		ret = spi_mem_exec_op(nor->spimem, &op);
 	} else
 		ret = spi_nor_write_reg(nor, SPINOR_OP_WREAR, nor->bouncebuf, 1);
@@ -485,6 +576,8 @@ int spi_nor_xread_sr(struct spi_nor *nor, u8 *sr)
 				   SPI_MEM_OP_NO_DUMMY,
 				   SPI_MEM_OP_DATA_IN(1, sr, 1));
 
+		spi_nor_spimem_setup_op(nor, &op, nor->reg_proto);
+
 		ret = spi_mem_exec_op(nor->spimem, &op);
 	} else
 		ret = spi_nor_read_reg(nor, SPINOR_OP_XRDSR, sr, 1);
@@ -528,6 +621,8 @@ static void spi_nor_clear_sr(struct spi_nor *nor)
 				   SPI_MEM_OP_NO_DUMMY,
 				   SPI_MEM_OP_NO_DATA);
 
+		spi_nor_spimem_setup_op(nor, &op, nor->reg_proto);
+
 		ret = spi_mem_exec_op(nor->spimem, &op);
 	} else
 		ret = spi_nor_write_reg(nor, SPINOR_OP_CLSR, NULL, 0);
@@ -590,6 +685,8 @@ static void spi_nor_clear_fsr(struct spi_nor *nor)
 				   SPI_MEM_OP_NO_DUMMY,
 				   SPI_MEM_OP_NO_DATA);
 
+		spi_nor_spimem_setup_op(nor, &op, nor->reg_proto);
+
 		ret = spi_mem_exec_op(nor->spimem, &op);
 	} else
 		ret = spi_nor_write_reg(nor, SPINOR_OP_CLFSR, NULL, 0);
@@ -732,6 +829,8 @@ static int spi_nor_write_sr(struct spi_nor *nor, const u8 *sr, size_t len)
 				   SPI_MEM_OP_NO_DUMMY,
 				   SPI_MEM_OP_DATA_OUT(len, sr, 1));
 
+		spi_nor_spimem_setup_op(nor, &op, nor->reg_proto);
+
 		ret = spi_mem_exec_op(nor->spimem, &op);
 	} else
 		ret = spi_nor_write_reg(nor, SPINOR_OP_WRSR, sr, len);
@@ -932,6 +1031,8 @@ static int spi_nor_write_sr2(struct spi_nor *nor, const u8 *sr2)
 				   SPI_MEM_OP_NO_DUMMY,
 				   SPI_MEM_OP_DATA_OUT(1, sr2, 1));
 
+		spi_nor_spimem_setup_op(nor, &op, nor->reg_proto);
+
 		ret = spi_mem_exec_op(nor->spimem, &op);
 	} else
 		ret = spi_nor_write_reg(nor, SPINOR_OP_WRSR2, sr2, 1);
@@ -964,6 +1065,8 @@ static int spi_nor_read_sr2(struct spi_nor *nor, u8 *sr2)
 				   SPI_MEM_OP_NO_DUMMY,
 				   SPI_MEM_OP_DATA_IN(1, sr2, 1));
 
+		spi_nor_spimem_setup_op(nor, &op, nor->reg_proto);
+
 		ret = spi_mem_exec_op(nor->spimem, &op);
 	} else
 		ret = spi_nor_read_reg(nor, SPINOR_OP_RDSR2, sr2, 1);
@@ -993,6 +1096,8 @@ static int spi_nor_erase_chip(struct spi_nor *nor)
 				   SPI_MEM_OP_NO_DUMMY,
 				   SPI_MEM_OP_NO_DATA);
 
+		spi_nor_spimem_setup_op(nor, &op, nor->write_proto);
+
 		ret = spi_mem_exec_op(nor->spimem, &op);
 	} else
 		ret = spi_nor_write_reg(nor, SPINOR_OP_CHIP_ERASE, NULL, 0);
@@ -1133,6 +1238,8 @@ static int spi_nor_erase_sector(struct spi_nor *nor, u32 addr)
 				   SPI_MEM_OP_NO_DUMMY,
 				   SPI_MEM_OP_NO_DATA);
 
+		spi_nor_spimem_setup_op(nor, &op, nor->write_proto);
+
 		return spi_mem_exec_op(nor->spimem, &op);
 	} else if (nor->controller_ops->erase) {
 		return spi_nor_controller_ops_erase(nor, addr);
@@ -2258,6 +2365,7 @@ int spi_nor_hwcaps_read2cmd(u32 hwcaps)
 		{ SNOR_HWCAPS_READ_1_8_8,	SNOR_CMD_READ_1_8_8 },
 		{ SNOR_HWCAPS_READ_8_8_8,	SNOR_CMD_READ_8_8_8 },
 		{ SNOR_HWCAPS_READ_1_8_8_DTR,	SNOR_CMD_READ_1_8_8_DTR },
+		{ SNOR_HWCAPS_READ_8_8_8_DTR,	SNOR_CMD_READ_8_8_8_DTR },
 	};
 
 	return spi_nor_hwcaps2cmd(hwcaps, hwcaps_read2cmd,
@@ -2274,6 +2382,7 @@ static int spi_nor_hwcaps_pp2cmd(u32 hwcaps)
 		{ SNOR_HWCAPS_PP_1_1_8,		SNOR_CMD_PP_1_1_8 },
 		{ SNOR_HWCAPS_PP_1_8_8,		SNOR_CMD_PP_1_8_8 },
 		{ SNOR_HWCAPS_PP_8_8_8,		SNOR_CMD_PP_8_8_8 },
+		{ SNOR_HWCAPS_PP_8_8_8_DTR,	SNOR_CMD_PP_8_8_8_DTR },
 	};
 
 	return spi_nor_hwcaps2cmd(hwcaps, hwcaps_pp2cmd,
@@ -2327,13 +2436,11 @@ static int spi_nor_spimem_check_readop(struct spi_nor *nor,
 					  SPI_MEM_OP_DUMMY(0, 1),
 					  SPI_MEM_OP_DATA_IN(0, NULL, 1));
 
-	op.cmd.buswidth = spi_nor_get_protocol_inst_nbits(read->proto);
-	op.addr.buswidth = spi_nor_get_protocol_addr_nbits(read->proto);
-	op.data.buswidth = spi_nor_get_protocol_data_nbits(read->proto);
-	op.dummy.buswidth = op.addr.buswidth;
 	op.dummy.nbytes = (read->num_mode_clocks + read->num_wait_states) *
 			  op.dummy.buswidth / 8;
 
+	spi_nor_spimem_setup_op(nor, &op, read->proto);
+
 	return spi_nor_spimem_check_op(nor, &op);
 }
 
@@ -2353,9 +2460,7 @@ static int spi_nor_spimem_check_pp(struct spi_nor *nor,
 					  SPI_MEM_OP_NO_DUMMY,
 					  SPI_MEM_OP_DATA_OUT(0, NULL, 1));
 
-	op.cmd.buswidth = spi_nor_get_protocol_inst_nbits(pp->proto);
-	op.addr.buswidth = spi_nor_get_protocol_addr_nbits(pp->proto);
-	op.data.buswidth = spi_nor_get_protocol_data_nbits(pp->proto);
+	spi_nor_spimem_setup_op(nor, &op, pp->proto);
 
 	return spi_nor_spimem_check_op(nor, &op);
 }
@@ -2373,12 +2478,16 @@ spi_nor_spimem_adjust_hwcaps(struct spi_nor *nor, u32 *hwcaps)
 	struct spi_nor_flash_parameter *params = nor->params;
 	unsigned int cap;
 
-	/* DTR modes are not supported yet, mask them all. */
-	*hwcaps &= ~SNOR_HWCAPS_DTR;
-
 	/* X-X-X modes are not supported yet, mask them all. */
 	*hwcaps &= ~SNOR_HWCAPS_X_X_X;
 
+	/*
+	 * If the reset line is broken, we do not want to enter a stateful
+	 * mode.
+	 */
+	if (nor->flags & SNOR_F_BROKEN_RESET)
+		*hwcaps &= ~(SNOR_HWCAPS_X_X_X | SNOR_HWCAPS_X_X_X_DTR);
+
 	for (cap = 0; cap < sizeof(*hwcaps) * BITS_PER_BYTE; cap++) {
 		int rdidx, ppidx;
 
@@ -2633,7 +2742,7 @@ static int spi_nor_default_setup(struct spi_nor *nor,
 		 * controller directly implements the spi_nor interface.
 		 * Yet another reason to switch to spi-mem.
 		 */
-		ignored_mask = SNOR_HWCAPS_X_X_X;
+		ignored_mask = SNOR_HWCAPS_X_X_X | SNOR_HWCAPS_X_X_X_DTR;
 		if (shared_mask & ignored_mask) {
 			dev_dbg(nor->dev,
 				"SPI n-n-n protocols are not supported.\n");
@@ -2779,11 +2888,28 @@ static void spi_nor_info_init_params(struct spi_nor *nor)
 					  SNOR_PROTO_1_1_8);
 	}
 
+	if (info->flags & SPI_NOR_OCTAL_DTR_READ) {
+		params->hwcaps.mask |= SNOR_HWCAPS_READ_8_8_8_DTR;
+		spi_nor_set_read_settings(&params->reads[SNOR_CMD_READ_8_8_8_DTR],
+					  0, 20, SPINOR_OP_READ_FAST,
+					  SNOR_PROTO_8_8_8_DTR);
+	}
+
 	/* Page Program settings. */
 	params->hwcaps.mask |= SNOR_HWCAPS_PP;
 	spi_nor_set_pp_settings(&params->page_programs[SNOR_CMD_PP],
 				SPINOR_OP_PP, SNOR_PROTO_1_1_1);
 
+	if (info->flags & SPI_NOR_OCTAL_DTR_PP) {
+		params->hwcaps.mask |= SNOR_HWCAPS_PP_8_8_8_DTR;
+		/*
+		 * Since xSPI Page Program opcode is backward compatible with
+		 * Legacy SPI, use Legacy SPI opcode there as well.
+		 */
+		spi_nor_set_pp_settings(&params->page_programs[SNOR_CMD_PP_8_8_8_DTR],
+					SPINOR_OP_PP, SNOR_PROTO_8_8_8_DTR);
+	}
+
 	/*
 	 * Sector Erase settings. Sort Erase Types in ascending order, with the
 	 * smallest erase size starting at BIT(0).
@@ -2891,7 +3017,8 @@ static int spi_nor_init_params(struct spi_nor *nor)
 
 	spi_nor_manufacturer_init_params(nor);
 
-	if ((nor->info->flags & (SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ)) &&
+	if ((nor->info->flags & (SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ |
+				 SPI_NOR_OCTAL_READ | SPI_NOR_OCTAL_DTR_READ)) &&
 	    !(nor->info->flags & SPI_NOR_SKIP_SFDP))
 		spi_nor_sfdp_init_params(nor);
 
@@ -2954,7 +3081,9 @@ static int spi_nor_init(struct spi_nor *nor)
 		return err;
 	}
 
-	if (nor->addr_width == 4 && !(nor->flags & SNOR_F_4B_OPCODES)) {
+	if (nor->addr_width == 4 &&
+	    !spi_nor_protocol_is_dtr(nor->read_proto) &&
+	    !(nor->flags & SNOR_F_4B_OPCODES)) {
 		/*
 		 * If the RESET# pin isn't hooked up properly, or the system
 		 * otherwise doesn't perform a reset command in the boot
@@ -3013,7 +3142,10 @@ static const struct flash_info *spi_nor_match_id(struct spi_nor *nor,
 
 static int spi_nor_set_addr_width(struct spi_nor *nor)
 {
-	if (nor->addr_width) {
+	if (spi_nor_protocol_is_dtr(nor->read_proto)) {
+		 /* Always use 4-byte addresses in DTR mode. */
+		nor->addr_width = 4;
+	} else if (nor->addr_width) {
 		/* already configured from SFDP */
 	} else if (nor->info->addr_width) {
 		nor->addr_width = nor->info->addr_width;
@@ -3252,14 +3384,19 @@ static int spi_nor_create_read_dirmap(struct spi_nor *nor)
 	};
 	struct spi_mem_op *op = &info.op_tmpl;
 
-	/* get transfer protocols. */
-	op->cmd.buswidth = spi_nor_get_protocol_inst_nbits(nor->read_proto);
-	op->addr.buswidth = spi_nor_get_protocol_addr_nbits(nor->read_proto);
-	op->dummy.buswidth = op->addr.buswidth;
-	op->data.buswidth = spi_nor_get_protocol_data_nbits(nor->read_proto);
+	spi_nor_spimem_setup_op(nor, op, nor->read_proto);
 
 	/* convert the dummy cycles to the number of bytes */
 	op->dummy.nbytes = (nor->read_dummy * op->dummy.buswidth) / 8;
+	if (spi_nor_protocol_is_dtr(nor->read_proto))
+		op->dummy.nbytes *= 2;
+
+	/*
+	 * Since spi_nor_spimem_setup_op() only sets buswidth when the number
+	 * of data bytes is non-zero, the data buswidth won't be set here. So,
+	 * do it explicitly.
+	 */
+	op->data.buswidth = spi_nor_get_protocol_data_nbits(nor->read_proto);
 
 	nor->dirmap.rdesc = devm_spi_mem_dirmap_create(nor->dev, nor->spimem,
 						       &info);
@@ -3278,15 +3415,18 @@ static int spi_nor_create_write_dirmap(struct spi_nor *nor)
 	};
 	struct spi_mem_op *op = &info.op_tmpl;
 
-	/* get transfer protocols. */
-	op->cmd.buswidth = spi_nor_get_protocol_inst_nbits(nor->write_proto);
-	op->addr.buswidth = spi_nor_get_protocol_addr_nbits(nor->write_proto);
-	op->dummy.buswidth = op->addr.buswidth;
-	op->data.buswidth = spi_nor_get_protocol_data_nbits(nor->write_proto);
-
 	if (nor->program_opcode == SPINOR_OP_AAI_WP && nor->sst_write_second)
 		op->addr.nbytes = 0;
 
+	spi_nor_spimem_setup_op(nor, op, nor->write_proto);
+
+	/*
+	 * Since spi_nor_spimem_setup_op() only sets buswidth when the number
+	 * of data bytes is non-zero, the data buswidth won't be set here. So,
+	 * do it explicitly.
+	 */
+	op->data.buswidth = spi_nor_get_protocol_data_nbits(nor->write_proto);
+
 	nor->dirmap.wdesc = devm_spi_mem_dirmap_create(nor->dev, nor->spimem,
 						       &info);
 	return PTR_ERR_OR_ZERO(nor->dirmap.wdesc);
diff --git a/drivers/mtd/spi-nor/core.h b/drivers/mtd/spi-nor/core.h
index 95aa32f3ceb1..125d27b0a72f 100644
--- a/drivers/mtd/spi-nor/core.h
+++ b/drivers/mtd/spi-nor/core.h
@@ -62,6 +62,7 @@ enum spi_nor_read_command_index {
 	SNOR_CMD_READ_1_8_8,
 	SNOR_CMD_READ_8_8_8,
 	SNOR_CMD_READ_1_8_8_DTR,
+	SNOR_CMD_READ_8_8_8_DTR,
 
 	SNOR_CMD_READ_MAX
 };
@@ -78,6 +79,7 @@ enum spi_nor_pp_command_index {
 	SNOR_CMD_PP_1_1_8,
 	SNOR_CMD_PP_1_8_8,
 	SNOR_CMD_PP_8_8_8,
+	SNOR_CMD_PP_8_8_8_DTR,
 
 	SNOR_CMD_PP_MAX
 };
@@ -311,6 +313,8 @@ struct flash_info {
 					 * BP3 is bit 6 of status register.
 					 * Must be used with SPI_NOR_4BIT_BP.
 					 */
+#define SPI_NOR_OCTAL_DTR_READ	BIT(19) /* Flash supports octal DTR Read. */
+#define SPI_NOR_OCTAL_DTR_PP	BIT(20) /* Flash supports Octal DTR Page Program */
 
 	/* Part specific fixup hooks. */
 	const struct spi_nor_fixups *fixups;
@@ -399,6 +403,9 @@ extern const struct spi_nor_manufacturer spi_nor_winbond;
 extern const struct spi_nor_manufacturer spi_nor_xilinx;
 extern const struct spi_nor_manufacturer spi_nor_xmc;
 
+void spi_nor_spimem_setup_op(const struct spi_nor *nor,
+			     struct spi_mem_op *op,
+			     const enum spi_nor_protocol proto);
 int spi_nor_write_enable(struct spi_nor *nor);
 int spi_nor_write_disable(struct spi_nor *nor);
 int spi_nor_set_4byte_addr_mode(struct spi_nor *nor, bool enable);
diff --git a/drivers/mtd/spi-nor/sfdp.c b/drivers/mtd/spi-nor/sfdp.c
index e2a43d39eb5f..21fa9ab78eae 100644
--- a/drivers/mtd/spi-nor/sfdp.c
+++ b/drivers/mtd/spi-nor/sfdp.c
@@ -1047,9 +1047,16 @@ static int spi_nor_parse_4bait(struct spi_nor *nor,
 	}
 
 	/* 4BAIT is the only SFDP table that indicates page program support. */
-	if (pp_hwcaps & SNOR_HWCAPS_PP)
+	if (pp_hwcaps & SNOR_HWCAPS_PP) {
 		spi_nor_set_pp_settings(&params_pp[SNOR_CMD_PP],
 					SPINOR_OP_PP_4B, SNOR_PROTO_1_1_1);
+		/*
+		 * Since xSPI Page Program opcode is backward compatible with
+		 * Legacy SPI, use Legacy SPI opcode there as well.
+		 */
+		spi_nor_set_pp_settings(&params_pp[SNOR_CMD_PP_8_8_8_DTR],
+					SPINOR_OP_PP_4B, SNOR_PROTO_8_8_8_DTR);
+	}
 	if (pp_hwcaps & SNOR_HWCAPS_PP_1_1_4)
 		spi_nor_set_pp_settings(&params_pp[SNOR_CMD_PP_1_1_4],
 					SPINOR_OP_PP_1_1_4_4B,
diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h
index 60bac2c0ec45..cd549042c53d 100644
--- a/include/linux/mtd/spi-nor.h
+++ b/include/linux/mtd/spi-nor.h
@@ -182,6 +182,7 @@ enum spi_nor_protocol {
 	SNOR_PROTO_1_2_2_DTR = SNOR_PROTO_DTR(1, 2, 2),
 	SNOR_PROTO_1_4_4_DTR = SNOR_PROTO_DTR(1, 4, 4),
 	SNOR_PROTO_1_8_8_DTR = SNOR_PROTO_DTR(1, 8, 8),
+	SNOR_PROTO_8_8_8_DTR = SNOR_PROTO_DTR(8, 8, 8),
 };
 
 static inline bool spi_nor_protocol_is_dtr(enum spi_nor_protocol proto)
@@ -228,7 +229,7 @@ struct spi_nor_hwcaps {
  * then Quad SPI protocols before Dual SPI protocols, Fast Read and lastly
  * (Slow) Read.
  */
-#define SNOR_HWCAPS_READ_MASK		GENMASK(14, 0)
+#define SNOR_HWCAPS_READ_MASK		GENMASK(15, 0)
 #define SNOR_HWCAPS_READ		BIT(0)
 #define SNOR_HWCAPS_READ_FAST		BIT(1)
 #define SNOR_HWCAPS_READ_1_1_1_DTR	BIT(2)
@@ -245,11 +246,12 @@ struct spi_nor_hwcaps {
 #define SNOR_HWCAPS_READ_4_4_4		BIT(9)
 #define SNOR_HWCAPS_READ_1_4_4_DTR	BIT(10)
 
-#define SNOR_HWCAPS_READ_OCTAL		GENMASK(14, 11)
+#define SNOR_HWCAPS_READ_OCTAL		GENMASK(15, 11)
 #define SNOR_HWCAPS_READ_1_1_8		BIT(11)
 #define SNOR_HWCAPS_READ_1_8_8		BIT(12)
 #define SNOR_HWCAPS_READ_8_8_8		BIT(13)
 #define SNOR_HWCAPS_READ_1_8_8_DTR	BIT(14)
+#define SNOR_HWCAPS_READ_8_8_8_DTR	BIT(15)
 
 /*
  * Page Program capabilities.
@@ -260,18 +262,19 @@ struct spi_nor_hwcaps {
  * JEDEC/SFDP standard to define them. Also at this moment no SPI flash memory
  * implements such commands.
  */
-#define SNOR_HWCAPS_PP_MASK	GENMASK(22, 16)
-#define SNOR_HWCAPS_PP		BIT(16)
+#define SNOR_HWCAPS_PP_MASK		GENMASK(23, 16)
+#define SNOR_HWCAPS_PP			BIT(16)
 
-#define SNOR_HWCAPS_PP_QUAD	GENMASK(19, 17)
-#define SNOR_HWCAPS_PP_1_1_4	BIT(17)
-#define SNOR_HWCAPS_PP_1_4_4	BIT(18)
-#define SNOR_HWCAPS_PP_4_4_4	BIT(19)
+#define SNOR_HWCAPS_PP_QUAD		GENMASK(19, 17)
+#define SNOR_HWCAPS_PP_1_1_4		BIT(17)
+#define SNOR_HWCAPS_PP_1_4_4		BIT(18)
+#define SNOR_HWCAPS_PP_4_4_4		BIT(19)
 
-#define SNOR_HWCAPS_PP_OCTAL	GENMASK(22, 20)
-#define SNOR_HWCAPS_PP_1_1_8	BIT(20)
-#define SNOR_HWCAPS_PP_1_8_8	BIT(21)
-#define SNOR_HWCAPS_PP_8_8_8	BIT(22)
+#define SNOR_HWCAPS_PP_OCTAL		GENMASK(23, 20)
+#define SNOR_HWCAPS_PP_1_1_8		BIT(20)
+#define SNOR_HWCAPS_PP_1_8_8		BIT(21)
+#define SNOR_HWCAPS_PP_8_8_8		BIT(22)
+#define SNOR_HWCAPS_PP_8_8_8_DTR	BIT(23)
 
 #define SNOR_HWCAPS_X_X_X	(SNOR_HWCAPS_READ_2_2_2 |	\
 				 SNOR_HWCAPS_READ_4_4_4 |	\
@@ -279,10 +282,14 @@ struct spi_nor_hwcaps {
 				 SNOR_HWCAPS_PP_4_4_4 |		\
 				 SNOR_HWCAPS_PP_8_8_8)
 
+#define SNOR_HWCAPS_X_X_X_DTR	(SNOR_HWCAPS_READ_8_8_8_DTR |	\
+				 SNOR_HWCAPS_PP_8_8_8_DTR)
+
 #define SNOR_HWCAPS_DTR		(SNOR_HWCAPS_READ_1_1_1_DTR |	\
 				 SNOR_HWCAPS_READ_1_2_2_DTR |	\
 				 SNOR_HWCAPS_READ_1_4_4_DTR |	\
-				 SNOR_HWCAPS_READ_1_8_8_DTR)
+				 SNOR_HWCAPS_READ_1_8_8_DTR |	\
+				 SNOR_HWCAPS_READ_8_8_8_DTR)
 
 #define SNOR_HWCAPS_ALL		(SNOR_HWCAPS_READ_MASK |	\
 				 SNOR_HWCAPS_PP_MASK)
@@ -318,6 +325,22 @@ struct spi_nor_controller_ops {
 	int (*erase)(struct spi_nor *nor, loff_t offs);
 };
 
+/**
+ * enum spi_nor_cmd_ext - describes the command opcode extension in DTR mode
+ * @SPI_NOR_EXT_NONE: no extension. This is the default, and is used in Legacy
+ *		      SPI mode
+ * @SPI_NOR_EXT_REPEAT: the extension is same as the opcode
+ * @SPI_NOR_EXT_INVERT: the extension is the bitwise inverse of the opcode
+ * @SPI_NOR_EXT_HEX: the extension is any hex value. The command and opcode
+ *		     combine to form a 16-bit opcode.
+ */
+enum spi_nor_cmd_ext {
+	SPI_NOR_EXT_NONE = 0,
+	SPI_NOR_EXT_REPEAT,
+	SPI_NOR_EXT_INVERT,
+	SPI_NOR_EXT_HEX,
+};
+
 /*
  * Forward declarations that are used internally by the core and manufacturer
  * drivers.
@@ -345,6 +368,7 @@ struct spi_nor_flash_parameter;
  * @program_opcode:	the program opcode
  * @sst_write_second:	used by the SST write operation
  * @flags:		flag options for the current SPI NOR (SNOR_F_*)
+ * @cmd_ext_type:	the command opcode extension type for DTR mode.
  * @read_proto:		the SPI protocol for read operations
  * @write_proto:	the SPI protocol for write operations
  * @reg_proto:		the SPI protocol for read_reg/write_reg/erase operations
@@ -376,6 +400,7 @@ struct spi_nor {
 	enum spi_nor_protocol	reg_proto;
 	bool			sst_write_second;
 	u32			flags;
+	enum spi_nor_cmd_ext	cmd_ext_type;
 
 	const struct spi_nor_controller_ops *controller_ops;
 
-- 
2.27.0


______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/

^ permalink raw reply	[flat|nested] 15+ messages in thread

* [PATCH v11 04/14] mtd: spi-nor: sfdp: get command opcode extension type from BFPT
  2020-07-23 13:11 [PATCH v11 00/14] mtd: spi-nor: add xSPI Octal DTR support Pratyush Yadav
                   ` (2 preceding siblings ...)
  2020-07-23 13:11 ` [PATCH v11 03/14] mtd: spi-nor: add support for DTR protocol Pratyush Yadav
@ 2020-07-23 13:11 ` Pratyush Yadav
  2020-07-23 13:11 ` [PATCH v11 05/14] mtd: spi-nor: sfdp: parse xSPI Profile 1.0 table Pratyush Yadav
                   ` (9 subsequent siblings)
  13 siblings, 0 replies; 15+ messages in thread
From: Pratyush Yadav @ 2020-07-23 13:11 UTC (permalink / raw)
  To: Tudor Ambarus, Miquel Raynal, Richard Weinberger,
	Vignesh Raghavendra, linux-mtd, linux-kernel
  Cc: Pratyush Yadav, Boris Brezillon, Sekhar Nori, Pratyush Yadav

From: Pratyush Yadav <p.yadav@ti.com>

Some devices in DTR mode expect an extra command byte called the
extension. The extension can either be same as the opcode, bitwise
inverse of the opcode, or another additional byte forming a 16-byte
opcode. Get the extension type from the BFPT. For now, only flashes with
"repeat" and "inverse" extensions are supported.

Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
---
 drivers/mtd/spi-nor/sfdp.c | 18 ++++++++++++++++++
 drivers/mtd/spi-nor/sfdp.h |  6 ++++++
 2 files changed, 24 insertions(+)

diff --git a/drivers/mtd/spi-nor/sfdp.c b/drivers/mtd/spi-nor/sfdp.c
index 21fa9ab78eae..cd8ada3de8fd 100644
--- a/drivers/mtd/spi-nor/sfdp.c
+++ b/drivers/mtd/spi-nor/sfdp.c
@@ -606,6 +606,24 @@ static int spi_nor_parse_bfpt(struct spi_nor *nor,
 	if (bfpt_header->length == BFPT_DWORD_MAX_JESD216B)
 		return spi_nor_post_bfpt_fixups(nor, bfpt_header, &bfpt,
 						params);
+	/* 8D-8D-8D command extension. */
+	switch (bfpt.dwords[BFPT_DWORD(18)] & BFPT_DWORD18_CMD_EXT_MASK) {
+	case BFPT_DWORD18_CMD_EXT_REP:
+		nor->cmd_ext_type = SPI_NOR_EXT_REPEAT;
+		break;
+
+	case BFPT_DWORD18_CMD_EXT_INV:
+		nor->cmd_ext_type = SPI_NOR_EXT_INVERT;
+		break;
+
+	case BFPT_DWORD18_CMD_EXT_RES:
+		dev_dbg(nor->dev, "Reserved command extension used\n");
+		break;
+
+	case BFPT_DWORD18_CMD_EXT_16B:
+		dev_dbg(nor->dev, "16-bit opcodes not supported\n");
+		return -ENOTSUPP;
+	}
 
 	return spi_nor_post_bfpt_fixups(nor, bfpt_header, &bfpt, params);
 }
diff --git a/drivers/mtd/spi-nor/sfdp.h b/drivers/mtd/spi-nor/sfdp.h
index 7f9846b3a1ad..6d7243067252 100644
--- a/drivers/mtd/spi-nor/sfdp.h
+++ b/drivers/mtd/spi-nor/sfdp.h
@@ -90,6 +90,12 @@ struct sfdp_bfpt {
 #define BFPT_DWORD15_QER_SR2_BIT1_NO_RD		(0x4UL << 20)
 #define BFPT_DWORD15_QER_SR2_BIT1		(0x5UL << 20) /* Spansion */
 
+#define BFPT_DWORD18_CMD_EXT_MASK		GENMASK(30, 29)
+#define BFPT_DWORD18_CMD_EXT_REP		(0x0UL << 29) /* Repeat */
+#define BFPT_DWORD18_CMD_EXT_INV		(0x1UL << 29) /* Invert */
+#define BFPT_DWORD18_CMD_EXT_RES		(0x2UL << 29) /* Reserved */
+#define BFPT_DWORD18_CMD_EXT_16B		(0x3UL << 29) /* 16-bit opcode */
+
 struct sfdp_parameter_header {
 	u8		id_lsb;
 	u8		minor;
-- 
2.27.0


______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/

^ permalink raw reply	[flat|nested] 15+ messages in thread

* [PATCH v11 05/14] mtd: spi-nor: sfdp: parse xSPI Profile 1.0 table
  2020-07-23 13:11 [PATCH v11 00/14] mtd: spi-nor: add xSPI Octal DTR support Pratyush Yadav
                   ` (3 preceding siblings ...)
  2020-07-23 13:11 ` [PATCH v11 04/14] mtd: spi-nor: sfdp: get command opcode extension type from BFPT Pratyush Yadav
@ 2020-07-23 13:11 ` Pratyush Yadav
  2020-07-23 13:11 ` [PATCH v11 06/14] mtd: spi-nor: core: use dummy cycle and address width info from SFDP Pratyush Yadav
                   ` (8 subsequent siblings)
  13 siblings, 0 replies; 15+ messages in thread
From: Pratyush Yadav @ 2020-07-23 13:11 UTC (permalink / raw)
  To: Tudor Ambarus, Miquel Raynal, Richard Weinberger,
	Vignesh Raghavendra, linux-mtd, linux-kernel
  Cc: Pratyush Yadav, Boris Brezillon, Sekhar Nori, Pratyush Yadav

From: Pratyush Yadav <p.yadav@ti.com>

This table is indication that the flash is xSPI compliant and hence
supports octal DTR mode. Extract information like the fast read opcode,
dummy cycles, the number of dummy cycles needed for a Read Status
Register command, and the number of address bytes needed for a Read
Status Register command.

We don't know what speed the controller is running at. Find the fast
read dummy cycles for the fastest frequency the flash can run at to be
sure we are never short of dummy cycles. If nothing is available,
default to 20. Flashes that use a different value should update it in
their fixup hooks.

Since we want to set read settings, expose spi_nor_set_read_settings()
in core.h.

Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
---
 drivers/mtd/spi-nor/core.c |  2 +-
 drivers/mtd/spi-nor/core.h | 10 +++++
 drivers/mtd/spi-nor/sfdp.c | 91 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 102 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
index 87f82bc8f014..6dfc54ff83be 100644
--- a/drivers/mtd/spi-nor/core.c
+++ b/drivers/mtd/spi-nor/core.c
@@ -2316,7 +2316,7 @@ static int spi_nor_check(struct spi_nor *nor)
 	return 0;
 }
 
-static void
+void
 spi_nor_set_read_settings(struct spi_nor_read_command *read,
 			  u8 num_mode_clocks,
 			  u8 num_wait_states,
diff --git a/drivers/mtd/spi-nor/core.h b/drivers/mtd/spi-nor/core.h
index 125d27b0a72f..27e00a9f5950 100644
--- a/drivers/mtd/spi-nor/core.h
+++ b/drivers/mtd/spi-nor/core.h
@@ -192,6 +192,9 @@ struct spi_nor_locking_ops {
  *
  * @size:		the flash memory density in bytes.
  * @page_size:		the page size of the SPI NOR flash memory.
+ * @rdsr_dummy:		dummy cycles needed for Read Status Register command.
+ * @rdsr_addr_nbytes:	dummy address bytes needed for Read Status Register
+ *			command.
  * @hwcaps:		describes the read and page program hardware
  *			capabilities.
  * @reads:		read capabilities ordered by priority: the higher index
@@ -214,6 +217,8 @@ struct spi_nor_locking_ops {
 struct spi_nor_flash_parameter {
 	u64				size;
 	u32				page_size;
+	u8				rdsr_dummy;
+	u8				rdsr_addr_nbytes;
 
 	struct spi_nor_hwcaps		hwcaps;
 	struct spi_nor_read_command	reads[SNOR_CMD_READ_MAX];
@@ -425,6 +430,11 @@ ssize_t spi_nor_write_data(struct spi_nor *nor, loff_t to, size_t len,
 
 int spi_nor_hwcaps_read2cmd(u32 hwcaps);
 u8 spi_nor_convert_3to4_read(u8 opcode);
+void spi_nor_set_read_settings(struct spi_nor_read_command *read,
+			      u8 num_mode_clocks,
+			      u8 num_wait_states,
+			      u8 opcode,
+			      enum spi_nor_protocol proto);
 void spi_nor_set_pp_settings(struct spi_nor_pp_command *pp, u8 opcode,
 			     enum spi_nor_protocol proto);
 
diff --git a/drivers/mtd/spi-nor/sfdp.c b/drivers/mtd/spi-nor/sfdp.c
index cd8ada3de8fd..05191f7b3b33 100644
--- a/drivers/mtd/spi-nor/sfdp.c
+++ b/drivers/mtd/spi-nor/sfdp.c
@@ -4,6 +4,7 @@
  * Copyright (C) 2014, Freescale Semiconductor, Inc.
  */
 
+#include <linux/bitfield.h>
 #include <linux/slab.h>
 #include <linux/sort.h>
 #include <linux/mtd/spi-nor.h>
@@ -19,6 +20,7 @@
 #define SFDP_BFPT_ID		0xff00	/* Basic Flash Parameter Table */
 #define SFDP_SECTOR_MAP_ID	0xff81	/* Sector Map Table */
 #define SFDP_4BAIT_ID		0xff84  /* 4-byte Address Instruction Table */
+#define SFDP_PROFILE1_ID	0xff05	/* xSPI Profile 1.0 table. */
 
 #define SFDP_SIGNATURE		0x50444653U
 
@@ -1108,6 +1110,91 @@ static int spi_nor_parse_4bait(struct spi_nor *nor,
 	return ret;
 }
 
+#define PROFILE1_DWORD1_RDSR_ADDR_BYTES		BIT(29)
+#define PROFILE1_DWORD1_RDSR_DUMMY		BIT(28)
+#define PROFILE1_DWORD1_RD_FAST_CMD		GENMASK(15, 8)
+#define PROFILE1_DWORD4_DUMMY_200MHZ		GENMASK(11, 7)
+#define PROFILE1_DWORD5_DUMMY_166MHZ		GENMASK(31, 27)
+#define PROFILE1_DWORD5_DUMMY_133MHZ		GENMASK(21, 17)
+#define PROFILE1_DWORD5_DUMMY_100MHZ		GENMASK(11, 7)
+#define PROFILE1_DUMMY_DEFAULT			20
+
+/**
+ * spi_nor_parse_profile1() - parse the xSPI Profile 1.0 table
+ * @nor:		pointer to a 'struct spi_nor'
+ * @param_header:	pointer to the 'struct sfdp_parameter_header' describing
+ *			the 4-Byte Address Instruction Table length and version.
+ * @params:		pointer to the 'struct spi_nor_flash_parameter' to be.
+ *
+ * Return: 0 on success, -errno otherwise.
+ */
+static int spi_nor_parse_profile1(struct spi_nor *nor,
+				  const struct sfdp_parameter_header *profile1_header,
+				  struct spi_nor_flash_parameter *params)
+{
+	u32 *dwords, addr;
+	size_t len;
+	int ret;
+	u8 dummy, opcode;
+
+	len = profile1_header->length * sizeof(*dwords);
+	dwords = kmalloc(len, GFP_KERNEL);
+	if (!dwords)
+		return -ENOMEM;
+
+	addr = SFDP_PARAM_HEADER_PTP(profile1_header);
+	ret = spi_nor_read_sfdp(nor, addr, len, dwords);
+	if (ret)
+		goto out;
+
+	le32_to_cpu_array(dwords, profile1_header->length);
+
+	/* Get 8D-8D-8D fast read opcode and dummy cycles. */
+	opcode = FIELD_GET(PROFILE1_DWORD1_RD_FAST_CMD, dwords[0]);
+
+	 /* Set the Read Status Register dummy cycles and dummy address bytes. */
+	if (dwords[0] & PROFILE1_DWORD1_RDSR_DUMMY)
+		params->rdsr_dummy = 8;
+	else
+		params->rdsr_dummy = 4;
+
+	if (dwords[0] & PROFILE1_DWORD1_RDSR_ADDR_BYTES)
+		params->rdsr_addr_nbytes = 4;
+	else
+		params->rdsr_addr_nbytes = 0;
+
+	/*
+	 * We don't know what speed the controller is running at. Find the
+	 * dummy cycles for the fastest frequency the flash can run at to be
+	 * sure we are never short of dummy cycles. A value of 0 means the
+	 * frequency is not supported.
+	 *
+	 * Default to PROFILE1_DUMMY_DEFAULT if we don't find anything, and let
+	 * flashes set the correct value if needed in their fixup hooks.
+	 */
+	dummy = FIELD_GET(PROFILE1_DWORD4_DUMMY_200MHZ, dwords[3]);
+	if (!dummy)
+		dummy = FIELD_GET(PROFILE1_DWORD5_DUMMY_166MHZ, dwords[4]);
+	if (!dummy)
+		dummy = FIELD_GET(PROFILE1_DWORD5_DUMMY_133MHZ, dwords[4]);
+	if (!dummy)
+		dummy = FIELD_GET(PROFILE1_DWORD5_DUMMY_100MHZ, dwords[4]);
+	if (!dummy)
+		dummy = PROFILE1_DUMMY_DEFAULT;
+
+	/* Round up to an even value to avoid tripping controllers up. */
+	dummy = round_up(dummy, 2);
+
+	/* Update the fast read settings. */
+	spi_nor_set_read_settings(&params->reads[SNOR_CMD_READ_8_8_8_DTR],
+				  0, dummy, opcode,
+				  SNOR_PROTO_8_8_8_DTR);
+
+out:
+	kfree(dwords);
+	return ret;
+}
+
 /**
  * spi_nor_parse_sfdp() - parse the Serial Flash Discoverable Parameters.
  * @nor:		pointer to a 'struct spi_nor'
@@ -1209,6 +1296,10 @@ int spi_nor_parse_sfdp(struct spi_nor *nor,
 			err = spi_nor_parse_4bait(nor, param_header, params);
 			break;
 
+		case SFDP_PROFILE1_ID:
+			err = spi_nor_parse_profile1(nor, param_header, params);
+			break;
+
 		default:
 			break;
 		}
-- 
2.27.0


______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/

^ permalink raw reply	[flat|nested] 15+ messages in thread

* [PATCH v11 06/14] mtd: spi-nor: core: use dummy cycle and address width info from SFDP
  2020-07-23 13:11 [PATCH v11 00/14] mtd: spi-nor: add xSPI Octal DTR support Pratyush Yadav
                   ` (4 preceding siblings ...)
  2020-07-23 13:11 ` [PATCH v11 05/14] mtd: spi-nor: sfdp: parse xSPI Profile 1.0 table Pratyush Yadav
@ 2020-07-23 13:11 ` Pratyush Yadav
  2020-07-23 13:11 ` [PATCH v11 07/14] mtd: spi-nor: core: do 2 byte reads for SR and FSR in DTR mode Pratyush Yadav
                   ` (7 subsequent siblings)
  13 siblings, 0 replies; 15+ messages in thread
From: Pratyush Yadav @ 2020-07-23 13:11 UTC (permalink / raw)
  To: Tudor Ambarus, Miquel Raynal, Richard Weinberger,
	Vignesh Raghavendra, linux-mtd, linux-kernel
  Cc: Pratyush Yadav, Boris Brezillon, Sekhar Nori, Pratyush Yadav

From: Pratyush Yadav <p.yadav@ti.com>

The xSPI Profile 1.0 table specifies how many dummy cycles and address
bytes are needed for the Read Status Register command in octal DTR mode.
Use that information to send the correct Read SR command.

Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
---
 drivers/mtd/spi-nor/core.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
index 6dfc54ff83be..185ca1fa2b50 100644
--- a/drivers/mtd/spi-nor/core.c
+++ b/drivers/mtd/spi-nor/core.c
@@ -379,6 +379,11 @@ static int spi_nor_read_sr(struct spi_nor *nor, u8 *sr)
 				   SPI_MEM_OP_NO_DUMMY,
 				   SPI_MEM_OP_DATA_IN(1, sr, 1));
 
+		if (spi_nor_protocol_is_dtr(nor->reg_proto)) {
+			op.addr.nbytes = nor->params->rdsr_addr_nbytes;
+			op.dummy.nbytes = nor->params->rdsr_dummy;
+		}
+
 		spi_nor_spimem_setup_op(nor, &op, nor->reg_proto);
 
 		ret = spi_mem_exec_op(nor->spimem, &op);
@@ -410,6 +415,11 @@ static int spi_nor_read_fsr(struct spi_nor *nor, u8 *fsr)
 				   SPI_MEM_OP_NO_DUMMY,
 				   SPI_MEM_OP_DATA_IN(1, fsr, 1));
 
+		if (spi_nor_protocol_is_dtr(nor->reg_proto)) {
+			op.addr.nbytes = nor->params->rdsr_addr_nbytes;
+			op.dummy.nbytes = nor->params->rdsr_dummy;
+		}
+
 		spi_nor_spimem_setup_op(nor, &op, nor->reg_proto);
 
 		ret = spi_mem_exec_op(nor->spimem, &op);
-- 
2.27.0


______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/

^ permalink raw reply	[flat|nested] 15+ messages in thread

* [PATCH v11 07/14] mtd: spi-nor: core: do 2 byte reads for SR and FSR in DTR mode
  2020-07-23 13:11 [PATCH v11 00/14] mtd: spi-nor: add xSPI Octal DTR support Pratyush Yadav
                   ` (5 preceding siblings ...)
  2020-07-23 13:11 ` [PATCH v11 06/14] mtd: spi-nor: core: use dummy cycle and address width info from SFDP Pratyush Yadav
@ 2020-07-23 13:11 ` Pratyush Yadav
  2020-07-23 13:11 ` [PATCH v11 08/14] mtd: spi-nor: core: enable octal DTR mode when possible Pratyush Yadav
                   ` (6 subsequent siblings)
  13 siblings, 0 replies; 15+ messages in thread
From: Pratyush Yadav @ 2020-07-23 13:11 UTC (permalink / raw)
  To: Tudor Ambarus, Miquel Raynal, Richard Weinberger,
	Vignesh Raghavendra, linux-mtd, linux-kernel
  Cc: Pratyush Yadav, Boris Brezillon, Sekhar Nori, Pratyush Yadav

From: Pratyush Yadav <p.yadav@ti.com>

Some controllers, like the cadence qspi controller, have trouble reading
only 1 byte in DTR mode. So, do 2 byte reads for SR and FSR commands in
DTR mode, and then discard the second byte.

Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
---
 drivers/mtd/spi-nor/core.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
index 185ca1fa2b50..6efc86e2aba0 100644
--- a/drivers/mtd/spi-nor/core.c
+++ b/drivers/mtd/spi-nor/core.c
@@ -364,7 +364,7 @@ int spi_nor_write_disable(struct spi_nor *nor)
  * spi_nor_read_sr() - Read the Status Register.
  * @nor:	pointer to 'struct spi_nor'.
  * @sr:		pointer to a DMA-able buffer where the value of the
- *              Status Register will be written.
+ *              Status Register will be written. Should be at least 2 bytes.
  *
  * Return: 0 on success, -errno otherwise.
  */
@@ -382,6 +382,11 @@ static int spi_nor_read_sr(struct spi_nor *nor, u8 *sr)
 		if (spi_nor_protocol_is_dtr(nor->reg_proto)) {
 			op.addr.nbytes = nor->params->rdsr_addr_nbytes;
 			op.dummy.nbytes = nor->params->rdsr_dummy;
+			/*
+			 * We don't want to read only one byte in DTR mode. So,
+			 * read 2 and then discard the second byte.
+			 */
+			op.data.nbytes = 2;
 		}
 
 		spi_nor_spimem_setup_op(nor, &op, nor->reg_proto);
@@ -400,7 +405,8 @@ static int spi_nor_read_sr(struct spi_nor *nor, u8 *sr)
  * spi_nor_read_fsr() - Read the Flag Status Register.
  * @nor:	pointer to 'struct spi_nor'
  * @fsr:	pointer to a DMA-able buffer where the value of the
- *              Flag Status Register will be written.
+ *              Flag Status Register will be written. Should be at least 2
+ *              bytes.
  *
  * Return: 0 on success, -errno otherwise.
  */
@@ -418,6 +424,11 @@ static int spi_nor_read_fsr(struct spi_nor *nor, u8 *fsr)
 		if (spi_nor_protocol_is_dtr(nor->reg_proto)) {
 			op.addr.nbytes = nor->params->rdsr_addr_nbytes;
 			op.dummy.nbytes = nor->params->rdsr_dummy;
+			/*
+			 * We don't want to read only one byte in DTR mode. So,
+			 * read 2 and then discard the second byte.
+			 */
+			op.data.nbytes = 2;
 		}
 
 		spi_nor_spimem_setup_op(nor, &op, nor->reg_proto);
-- 
2.27.0


______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/

^ permalink raw reply	[flat|nested] 15+ messages in thread

* [PATCH v11 08/14] mtd: spi-nor: core: enable octal DTR mode when possible
  2020-07-23 13:11 [PATCH v11 00/14] mtd: spi-nor: add xSPI Octal DTR support Pratyush Yadav
                   ` (6 preceding siblings ...)
  2020-07-23 13:11 ` [PATCH v11 07/14] mtd: spi-nor: core: do 2 byte reads for SR and FSR in DTR mode Pratyush Yadav
@ 2020-07-23 13:11 ` Pratyush Yadav
  2020-07-23 13:11 ` [PATCH v11 09/14] mtd: spi-nor: sfdp: detect Soft Reset sequence support from BFPT Pratyush Yadav
                   ` (5 subsequent siblings)
  13 siblings, 0 replies; 15+ messages in thread
From: Pratyush Yadav @ 2020-07-23 13:11 UTC (permalink / raw)
  To: Tudor Ambarus, Miquel Raynal, Richard Weinberger,
	Vignesh Raghavendra, linux-mtd, linux-kernel
  Cc: Pratyush Yadav, Boris Brezillon, Sekhar Nori, Pratyush Yadav

From: Pratyush Yadav <p.yadav@ti.com>

Allow flashes to specify a hook to enable octal DTR mode. Use this hook
whenever possible to get optimal transfer speeds.

Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
---
 drivers/mtd/spi-nor/core.c | 35 +++++++++++++++++++++++++++++++++++
 drivers/mtd/spi-nor/core.h |  2 ++
 2 files changed, 37 insertions(+)

diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
index 6efc86e2aba0..b990fc7add20 100644
--- a/drivers/mtd/spi-nor/core.c
+++ b/drivers/mtd/spi-nor/core.c
@@ -3050,6 +3050,35 @@ static int spi_nor_init_params(struct spi_nor *nor)
 	return 0;
 }
 
+/** spi_nor_octal_dtr_enable() - enable Octal DTR I/O if needed
+ * @nor:                 pointer to a 'struct spi_nor'
+ * @enable:              whether to enable or disable Octal DTR
+ *
+ * Return: 0 on success, -errno otherwise.
+ */
+static int spi_nor_octal_dtr_enable(struct spi_nor *nor, bool enable)
+{
+	int ret;
+
+	if (!nor->params->octal_dtr_enable)
+		return 0;
+
+	if (!(nor->read_proto == SNOR_PROTO_8_8_8_DTR &&
+	      nor->write_proto == SNOR_PROTO_8_8_8_DTR))
+		return 0;
+
+	ret = nor->params->octal_dtr_enable(nor, enable);
+	if (ret)
+		return ret;
+
+	if (enable)
+		nor->reg_proto = SNOR_PROTO_8_8_8_DTR;
+	else
+		nor->reg_proto = SNOR_PROTO_1_1_1;
+
+	return 0;
+}
+
 /**
  * spi_nor_quad_enable() - enable/disable Quad I/O if needed.
  * @nor:                pointer to a 'struct spi_nor'
@@ -3090,6 +3119,12 @@ static int spi_nor_init(struct spi_nor *nor)
 {
 	int err;
 
+	err = spi_nor_octal_dtr_enable(nor, true);
+	if (err) {
+		dev_dbg(nor->dev, "octal mode not supported\n");
+		return err;
+	}
+
 	err = spi_nor_quad_enable(nor, true);
 	if (err) {
 		dev_dbg(nor->dev, "quad mode not supported\n");
diff --git a/drivers/mtd/spi-nor/core.h b/drivers/mtd/spi-nor/core.h
index 27e00a9f5950..17dbbb3e4796 100644
--- a/drivers/mtd/spi-nor/core.h
+++ b/drivers/mtd/spi-nor/core.h
@@ -203,6 +203,7 @@ struct spi_nor_locking_ops {
  *                      higher index in the array, the higher priority.
  * @erase_map:		the erase map parsed from the SFDP Sector Map Parameter
  *                      Table.
+ * @octal_dtr_enable:	enables SPI NOR octal DTR mode.
  * @quad_enable:	enables/disables SPI NOR Quad mode.
  * @set_4byte_addr_mode: puts the SPI NOR in 4 byte addressing mode.
  * @convert_addr:	converts an absolute address into something the flash
@@ -226,6 +227,7 @@ struct spi_nor_flash_parameter {
 
 	struct spi_nor_erase_map        erase_map;
 
+	int (*octal_dtr_enable)(struct spi_nor *nor, bool enable);
 	int (*quad_enable)(struct spi_nor *nor, bool enable);
 	int (*set_4byte_addr_mode)(struct spi_nor *nor, bool enable);
 	u32 (*convert_addr)(struct spi_nor *nor, u32 addr);
-- 
2.27.0


______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/

^ permalink raw reply	[flat|nested] 15+ messages in thread

* [PATCH v11 09/14] mtd: spi-nor: sfdp: detect Soft Reset sequence support from BFPT
  2020-07-23 13:11 [PATCH v11 00/14] mtd: spi-nor: add xSPI Octal DTR support Pratyush Yadav
                   ` (7 preceding siblings ...)
  2020-07-23 13:11 ` [PATCH v11 08/14] mtd: spi-nor: core: enable octal DTR mode when possible Pratyush Yadav
@ 2020-07-23 13:11 ` Pratyush Yadav
  2020-07-23 13:11 ` [PATCH v11 10/14] mtd: spi-nor: core: perform a Soft Reset on shutdown Pratyush Yadav
                   ` (4 subsequent siblings)
  13 siblings, 0 replies; 15+ messages in thread
From: Pratyush Yadav @ 2020-07-23 13:11 UTC (permalink / raw)
  To: Tudor Ambarus, Miquel Raynal, Richard Weinberger,
	Vignesh Raghavendra, linux-mtd, linux-kernel
  Cc: Pratyush Yadav, Boris Brezillon, Sekhar Nori, Pratyush Yadav

From: Pratyush Yadav <p.yadav@ti.com>

A Soft Reset sequence will return the flash to Power-on-Reset (POR)
state. It consists of two commands: Soft Reset Enable and Soft Reset.
Find out if the sequence is supported from BFPT DWORD 16.

Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
---
 drivers/mtd/spi-nor/core.h | 1 +
 drivers/mtd/spi-nor/sfdp.c | 4 ++++
 drivers/mtd/spi-nor/sfdp.h | 2 ++
 3 files changed, 7 insertions(+)

diff --git a/drivers/mtd/spi-nor/core.h b/drivers/mtd/spi-nor/core.h
index 17dbbb3e4796..ec54ce6c5403 100644
--- a/drivers/mtd/spi-nor/core.h
+++ b/drivers/mtd/spi-nor/core.h
@@ -26,6 +26,7 @@ enum spi_nor_option_flags {
 	SNOR_F_HAS_SR_TB_BIT6	= BIT(11),
 	SNOR_F_HAS_4BIT_BP      = BIT(12),
 	SNOR_F_HAS_SR_BP3_BIT6  = BIT(13),
+	SNOR_F_SOFT_RESET	= BIT(14),
 };
 
 struct spi_nor_read_command {
diff --git a/drivers/mtd/spi-nor/sfdp.c b/drivers/mtd/spi-nor/sfdp.c
index 05191f7b3b33..3bd173546cca 100644
--- a/drivers/mtd/spi-nor/sfdp.c
+++ b/drivers/mtd/spi-nor/sfdp.c
@@ -604,6 +604,10 @@ static int spi_nor_parse_bfpt(struct spi_nor *nor,
 		break;
 	}
 
+	/* Soft Reset support. */
+	if (bfpt.dwords[BFPT_DWORD(16)] & BFPT_DWORD16_SOFT_RST)
+		nor->flags |= SNOR_F_SOFT_RESET;
+
 	/* Stop here if not JESD216 rev C or later. */
 	if (bfpt_header->length == BFPT_DWORD_MAX_JESD216B)
 		return spi_nor_post_bfpt_fixups(nor, bfpt_header, &bfpt,
diff --git a/drivers/mtd/spi-nor/sfdp.h b/drivers/mtd/spi-nor/sfdp.h
index 6d7243067252..8ae55e98084e 100644
--- a/drivers/mtd/spi-nor/sfdp.h
+++ b/drivers/mtd/spi-nor/sfdp.h
@@ -90,6 +90,8 @@ struct sfdp_bfpt {
 #define BFPT_DWORD15_QER_SR2_BIT1_NO_RD		(0x4UL << 20)
 #define BFPT_DWORD15_QER_SR2_BIT1		(0x5UL << 20) /* Spansion */
 
+#define BFPT_DWORD16_SOFT_RST			BIT(12)
+
 #define BFPT_DWORD18_CMD_EXT_MASK		GENMASK(30, 29)
 #define BFPT_DWORD18_CMD_EXT_REP		(0x0UL << 29) /* Repeat */
 #define BFPT_DWORD18_CMD_EXT_INV		(0x1UL << 29) /* Invert */
-- 
2.27.0


______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/

^ permalink raw reply	[flat|nested] 15+ messages in thread

* [PATCH v11 10/14] mtd: spi-nor: core: perform a Soft Reset on shutdown
  2020-07-23 13:11 [PATCH v11 00/14] mtd: spi-nor: add xSPI Octal DTR support Pratyush Yadav
                   ` (8 preceding siblings ...)
  2020-07-23 13:11 ` [PATCH v11 09/14] mtd: spi-nor: sfdp: detect Soft Reset sequence support from BFPT Pratyush Yadav
@ 2020-07-23 13:11 ` Pratyush Yadav
  2020-07-23 13:12 ` [PATCH v11 11/14] mtd: spi-nor: core: disable Octal DTR mode on suspend Pratyush Yadav
                   ` (3 subsequent siblings)
  13 siblings, 0 replies; 15+ messages in thread
From: Pratyush Yadav @ 2020-07-23 13:11 UTC (permalink / raw)
  To: Tudor Ambarus, Miquel Raynal, Richard Weinberger,
	Vignesh Raghavendra, linux-mtd, linux-kernel
  Cc: Pratyush Yadav, Boris Brezillon, Sekhar Nori, Pratyush Yadav

From: Pratyush Yadav <p.yadav@ti.com>

Perform a Soft Reset on shutdown on flashes that support it so that the
flash can be reset to its initial state and any configurations made by
spi-nor (given that they're only done in volatile registers) will be
reset. This will hand back the flash in pristine state for any further
operations on it.

Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
---
 drivers/mtd/spi-nor/core.c  | 41 +++++++++++++++++++++++++++++++++++++
 include/linux/mtd/spi-nor.h |  2 ++
 2 files changed, 43 insertions(+)

diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
index b990fc7add20..f55c062a7bd5 100644
--- a/drivers/mtd/spi-nor/core.c
+++ b/drivers/mtd/spi-nor/core.c
@@ -40,6 +40,9 @@
 
 #define SPI_NOR_MAX_ADDR_WIDTH	4
 
+#define SPI_NOR_SRST_SLEEP_MIN 200
+#define SPI_NOR_SRST_SLEEP_MAX 400
+
 /**
  * spi_nor_get_cmd_ext() - Get the command opcode extension based on the
  *			   extension type.
@@ -3155,6 +3158,41 @@ static int spi_nor_init(struct spi_nor *nor)
 	return 0;
 }
 
+static void spi_nor_soft_reset(struct spi_nor *nor)
+{
+	struct spi_mem_op op;
+	int ret;
+
+	op = (struct spi_mem_op)SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_SRSTEN, 8),
+			SPI_MEM_OP_NO_DUMMY,
+			SPI_MEM_OP_NO_ADDR,
+			SPI_MEM_OP_NO_DATA);
+	spi_nor_spimem_setup_op(nor, &op, nor->reg_proto);
+	ret = spi_mem_exec_op(nor->spimem, &op);
+	if (ret) {
+		dev_warn(nor->dev, "Software reset failed: %d\n", ret);
+		return;
+	}
+
+	op = (struct spi_mem_op)SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_SRST, 8),
+			SPI_MEM_OP_NO_DUMMY,
+			SPI_MEM_OP_NO_ADDR,
+			SPI_MEM_OP_NO_DATA);
+	spi_nor_spimem_setup_op(nor, &op, nor->reg_proto);
+	ret = spi_mem_exec_op(nor->spimem, &op);
+	if (ret) {
+		dev_warn(nor->dev, "Software reset failed: %d\n", ret);
+		return;
+	}
+
+	/*
+	 * Software Reset is not instant, and the delay varies from flash to
+	 * flash. Looking at a few flashes, most range somewhere below 100
+	 * microseconds. So, sleep for a range of 200-400 us.
+	 */
+	usleep_range(SPI_NOR_SRST_SLEEP_MIN, SPI_NOR_SRST_SLEEP_MAX);
+}
+
 /* mtd resume handler */
 static void spi_nor_resume(struct mtd_info *mtd)
 {
@@ -3175,6 +3213,9 @@ void spi_nor_restore(struct spi_nor *nor)
 	    nor->flags & SNOR_F_BROKEN_RESET)
 		nor->params->set_4byte_addr_mode(nor, false);
 
+	if (nor->flags & SNOR_F_SOFT_RESET)
+		spi_nor_soft_reset(nor);
+
 	spi_nor_quad_enable(nor, false);
 }
 EXPORT_SYMBOL_GPL(spi_nor_restore);
diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h
index cd549042c53d..299685d15dc2 100644
--- a/include/linux/mtd/spi-nor.h
+++ b/include/linux/mtd/spi-nor.h
@@ -51,6 +51,8 @@
 #define SPINOR_OP_CLFSR		0x50	/* Clear flag status register */
 #define SPINOR_OP_RDEAR		0xc8	/* Read Extended Address Register */
 #define SPINOR_OP_WREAR		0xc5	/* Write Extended Address Register */
+#define SPINOR_OP_SRSTEN	0x66	/* Software Reset Enable */
+#define SPINOR_OP_SRST		0x99	/* Software Reset */
 
 /* 4-byte address opcodes - used on Spansion and some Macronix flashes. */
 #define SPINOR_OP_READ_4B	0x13	/* Read data bytes (low frequency) */
-- 
2.27.0


______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/

^ permalink raw reply	[flat|nested] 15+ messages in thread

* [PATCH v11 11/14] mtd: spi-nor: core: disable Octal DTR mode on suspend.
  2020-07-23 13:11 [PATCH v11 00/14] mtd: spi-nor: add xSPI Octal DTR support Pratyush Yadav
                   ` (9 preceding siblings ...)
  2020-07-23 13:11 ` [PATCH v11 10/14] mtd: spi-nor: core: perform a Soft Reset on shutdown Pratyush Yadav
@ 2020-07-23 13:12 ` Pratyush Yadav
  2020-07-23 13:12 ` [PATCH v11 12/14] mtd: spi-nor: core: expose spi_nor_default_setup() in core.h Pratyush Yadav
                   ` (2 subsequent siblings)
  13 siblings, 0 replies; 15+ messages in thread
From: Pratyush Yadav @ 2020-07-23 13:12 UTC (permalink / raw)
  To: Tudor Ambarus, Miquel Raynal, Richard Weinberger,
	Vignesh Raghavendra, linux-mtd, linux-kernel
  Cc: Pratyush Yadav, Boris Brezillon, Sekhar Nori, Pratyush Yadav

From: Pratyush Yadav <p.yadav@ti.com>

On resume, the init procedure will be run that will re-enable it.

Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
---
 drivers/mtd/spi-nor/core.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
index f55c062a7bd5..a263196d970f 100644
--- a/drivers/mtd/spi-nor/core.c
+++ b/drivers/mtd/spi-nor/core.c
@@ -3193,6 +3193,23 @@ static void spi_nor_soft_reset(struct spi_nor *nor)
 	usleep_range(SPI_NOR_SRST_SLEEP_MIN, SPI_NOR_SRST_SLEEP_MAX);
 }
 
+/* mtd suspend handler */
+static int spi_nor_suspend(struct mtd_info *mtd)
+{
+	struct spi_nor *nor = mtd_to_spi_nor(mtd);
+	struct device *dev = nor->dev;
+	int ret;
+
+	/* Disable octal DTR mode if we enabled it. */
+	ret = spi_nor_octal_dtr_enable(nor, false);
+	if (ret) {
+		dev_err(dev, "suspend() failed\n");
+		return ret;
+	}
+
+	return 0;
+}
+
 /* mtd resume handler */
 static void spi_nor_resume(struct mtd_info *mtd)
 {
@@ -3387,6 +3404,7 @@ int spi_nor_scan(struct spi_nor *nor, const char *name,
 	mtd->size = nor->params->size;
 	mtd->_erase = spi_nor_erase;
 	mtd->_read = spi_nor_read;
+	mtd->_suspend = spi_nor_suspend;
 	mtd->_resume = spi_nor_resume;
 
 	if (nor->params->locking_ops) {
-- 
2.27.0


______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/

^ permalink raw reply	[flat|nested] 15+ messages in thread

* [PATCH v11 12/14] mtd: spi-nor: core: expose spi_nor_default_setup() in core.h
  2020-07-23 13:11 [PATCH v11 00/14] mtd: spi-nor: add xSPI Octal DTR support Pratyush Yadav
                   ` (10 preceding siblings ...)
  2020-07-23 13:12 ` [PATCH v11 11/14] mtd: spi-nor: core: disable Octal DTR mode on suspend Pratyush Yadav
@ 2020-07-23 13:12 ` Pratyush Yadav
  2020-07-23 13:12 ` [PATCH v11 13/14] mtd: spi-nor: spansion: add support for Cypress Semper flash Pratyush Yadav
  2020-07-23 13:12 ` [PATCH v11 14/14] mtd: spi-nor: micron-st: allow using MT35XU512ABA in Octal DTR mode Pratyush Yadav
  13 siblings, 0 replies; 15+ messages in thread
From: Pratyush Yadav @ 2020-07-23 13:12 UTC (permalink / raw)
  To: Tudor Ambarus, Miquel Raynal, Richard Weinberger,
	Vignesh Raghavendra, linux-mtd, linux-kernel
  Cc: Pratyush Yadav, Boris Brezillon, Sekhar Nori, Pratyush Yadav

From: Pratyush Yadav <p.yadav@ti.com>

Flashes might want to add a custom setup hook to configure the flash in
the proper mode for operation. But after that, they would still want to
run the default setup hook because it selects the read, program, and
erase operations. Since there is little point in repeating all that
code, expose the spi_nor_default_setup() in core.h to
manufacturer-specific files.

Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
---
 drivers/mtd/spi-nor/core.c | 4 ++--
 drivers/mtd/spi-nor/core.h | 3 +++
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
index a263196d970f..5ebe0aed0871 100644
--- a/drivers/mtd/spi-nor/core.c
+++ b/drivers/mtd/spi-nor/core.c
@@ -2740,8 +2740,8 @@ static int spi_nor_select_erase(struct spi_nor *nor)
 	return 0;
 }
 
-static int spi_nor_default_setup(struct spi_nor *nor,
-				 const struct spi_nor_hwcaps *hwcaps)
+int spi_nor_default_setup(struct spi_nor *nor,
+			  const struct spi_nor_hwcaps *hwcaps)
 {
 	struct spi_nor_flash_parameter *params = nor->params;
 	u32 ignored_mask, shared_mask;
diff --git a/drivers/mtd/spi-nor/core.h b/drivers/mtd/spi-nor/core.h
index ec54ce6c5403..24cff27c51aa 100644
--- a/drivers/mtd/spi-nor/core.h
+++ b/drivers/mtd/spi-nor/core.h
@@ -453,6 +453,9 @@ int spi_nor_post_bfpt_fixups(struct spi_nor *nor,
 			     const struct sfdp_bfpt *bfpt,
 			     struct spi_nor_flash_parameter *params);
 
+int spi_nor_default_setup(struct spi_nor *nor,
+			  const struct spi_nor_hwcaps *hwcaps);
+
 static struct spi_nor __maybe_unused *mtd_to_spi_nor(struct mtd_info *mtd)
 {
 	return mtd->priv;
-- 
2.27.0


______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/

^ permalink raw reply	[flat|nested] 15+ messages in thread

* [PATCH v11 13/14] mtd: spi-nor: spansion: add support for Cypress Semper flash
  2020-07-23 13:11 [PATCH v11 00/14] mtd: spi-nor: add xSPI Octal DTR support Pratyush Yadav
                   ` (11 preceding siblings ...)
  2020-07-23 13:12 ` [PATCH v11 12/14] mtd: spi-nor: core: expose spi_nor_default_setup() in core.h Pratyush Yadav
@ 2020-07-23 13:12 ` Pratyush Yadav
  2020-07-23 13:12 ` [PATCH v11 14/14] mtd: spi-nor: micron-st: allow using MT35XU512ABA in Octal DTR mode Pratyush Yadav
  13 siblings, 0 replies; 15+ messages in thread
From: Pratyush Yadav @ 2020-07-23 13:12 UTC (permalink / raw)
  To: Tudor Ambarus, Miquel Raynal, Richard Weinberger,
	Vignesh Raghavendra, linux-mtd, linux-kernel
  Cc: Pratyush Yadav, Boris Brezillon, Sekhar Nori, Pratyush Yadav

From: Pratyush Yadav <p.yadav@ti.com>

The Cypress Semper flash is an xSPI compliant octal DTR flash. Add
support for using it in octal DTR mode.

The flash by default boots in a hybrid sector mode. But the sector map
table on the part I had was programmed incorrectly and the SMPT values
on the flash don't match the public datasheet. Specifically, in some
places erase type 3 was used instead of 4. In addition, the region sizes
were incorrect in some places. So, for testing I set CFR3N[3] to enable
uniform sector sizes. Since the uniform sector mode bit is a
non-volatile bit, this series does not change it to avoid making any
permanent changes to the flash configuration. The correct data to
implement a fixup is not available right now and will be done in a
follow-up patch if needed.

Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
---
 drivers/mtd/spi-nor/spansion.c | 165 +++++++++++++++++++++++++++++++++
 1 file changed, 165 insertions(+)

diff --git a/drivers/mtd/spi-nor/spansion.c b/drivers/mtd/spi-nor/spansion.c
index 953df1c488ec..824d6b35cffc 100644
--- a/drivers/mtd/spi-nor/spansion.c
+++ b/drivers/mtd/spi-nor/spansion.c
@@ -8,6 +8,166 @@
 
 #include "core.h"
 
+#define SPINOR_OP_RD_ANY_REG			0x65	/* Read any register */
+#define SPINOR_OP_WR_ANY_REG			0x71	/* Write any register */
+#define SPINOR_REG_CYPRESS_CFR2V		0x00800003
+#define SPINOR_REG_CYPRESS_CFR2V_MEMLAT_11_24	0xb
+#define SPINOR_REG_CYPRESS_CFR3V		0x00800004
+#define SPINOR_REG_CYPRESS_CFR3V_PGSZ		BIT(4) /* Page size. */
+#define SPINOR_REG_CYPRESS_CFR5V		0x00800006
+#define SPINOR_REG_CYPRESS_CFR5V_OCT_DTR_EN	0x3
+#define SPINOR_REG_CYPRESS_CFR5V_OCT_DTR_DS	0
+#define SPINOR_OP_CYPRESS_RD_FAST		0xee
+
+/**
+ * spi_nor_cypress_octal_dtr_enable() - Enable octal DTR on Cypress flashes.
+ * @nor:		pointer to a 'struct spi_nor'
+ *
+ * This also sets the memory access latency cycles to 24 to allow the flash to
+ * run at up to 200MHz.
+ *
+ * Return: 0 on success, -errno otherwise.
+ */
+static int spi_nor_cypress_octal_dtr_enable(struct spi_nor *nor, bool enable)
+{
+	struct spi_mem_op op;
+	u8 *buf = nor->bouncebuf;
+	u8 addr_width;
+	int ret;
+
+	if (enable)
+		addr_width = 3;
+	else
+		addr_width = 4;
+
+	if (enable) {
+		/* Use 24 dummy cycles for memory array reads. */
+		ret = spi_nor_write_enable(nor);
+		if (ret)
+			return ret;
+
+		*buf = SPINOR_REG_CYPRESS_CFR2V_MEMLAT_11_24;
+		op = (struct spi_mem_op)
+			SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_WR_ANY_REG, 1),
+				   SPI_MEM_OP_ADDR(addr_width,
+						   SPINOR_REG_CYPRESS_CFR2V,
+						   1),
+				   SPI_MEM_OP_NO_DUMMY,
+				   SPI_MEM_OP_DATA_OUT(1, buf, 1));
+		ret = spi_mem_exec_op(nor->spimem, &op);
+		if (ret) {
+			dev_warn(nor->dev,
+				 "failed to set default memory latency value: %d\n",
+				 ret);
+			return ret;
+		}
+		ret = spi_nor_wait_till_ready(nor);
+		if (ret)
+			return ret;
+
+		nor->read_dummy = 24;
+	}
+
+	/* Set/unset the octal and DTR enable bits. */
+	ret = spi_nor_write_enable(nor);
+	if (ret)
+		return ret;
+
+	if (enable)
+		*buf = SPINOR_REG_CYPRESS_CFR5V_OCT_DTR_EN;
+	else
+		*buf = SPINOR_REG_CYPRESS_CFR5V_OCT_DTR_DS;
+	op = (struct spi_mem_op)
+		SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_WR_ANY_REG, 1),
+			   SPI_MEM_OP_ADDR(addr_width,
+					   SPINOR_REG_CYPRESS_CFR5V,
+					   1),
+			   SPI_MEM_OP_NO_DUMMY,
+			   SPI_MEM_OP_DATA_OUT(1, buf, 1));
+
+	if (!enable)
+		spi_nor_spimem_setup_op(nor, &op, SNOR_PROTO_8_8_8_DTR);
+
+	ret = spi_mem_exec_op(nor->spimem, &op);
+	if (ret) {
+		dev_warn(nor->dev, "Failed to enable octal DTR mode\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static void s28hs512t_default_init(struct spi_nor *nor)
+{
+	nor->params->octal_dtr_enable = spi_nor_cypress_octal_dtr_enable;
+}
+
+static void s28hs512t_post_sfdp_fixup(struct spi_nor *nor)
+{
+	/*
+	 * On older versions of the flash the xSPI Profile 1.0 table has the
+	 * 8D-8D-8D Fast Read opcode as 0x00. But it actually should be 0xEE.
+	 */
+	if (nor->params->reads[SNOR_CMD_READ_8_8_8_DTR].opcode == 0)
+		nor->params->reads[SNOR_CMD_READ_8_8_8_DTR].opcode =
+			SPINOR_OP_CYPRESS_RD_FAST;
+
+	/* This flash is also missing the 4-byte Page Program opcode bit. */
+	spi_nor_set_pp_settings(&nor->params->page_programs[SNOR_CMD_PP],
+				SPINOR_OP_PP_4B, SNOR_PROTO_1_1_1);
+	/*
+	 * Since xSPI Page Program opcode is backward compatible with
+	 * Legacy SPI, use Legacy SPI opcode there as well.
+	 */
+	spi_nor_set_pp_settings(&nor->params->page_programs[SNOR_CMD_PP_8_8_8_DTR],
+				SPINOR_OP_PP_4B, SNOR_PROTO_8_8_8_DTR);
+
+	/*
+	 * The xSPI Profile 1.0 table advertises the number of additional
+	 * address bytes needed for Read Status Register command as 0 but the
+	 * actual value for that is 4.
+	 */
+	nor->params->rdsr_addr_nbytes = 4;
+}
+
+static int s28hs512t_post_bfpt_fixup(struct spi_nor *nor,
+				     const struct sfdp_parameter_header *bfpt_header,
+				     const struct sfdp_bfpt *bfpt,
+				     struct spi_nor_flash_parameter *params)
+{
+	struct spi_mem_op op;
+	u8 *buf = nor->bouncebuf;
+	u8 addr_width = 3;
+	int ret;
+
+	/*
+	 * The BFPT table advertises a 512B page size but the page size is
+	 * actually configurable (with the default being 256B). Read from
+	 * CFR3V[4] and set the correct size.
+	 */
+	op = (struct spi_mem_op)
+		SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_RD_ANY_REG, 1),
+			   SPI_MEM_OP_ADDR(addr_width, SPINOR_REG_CYPRESS_CFR3V, 1),
+			   SPI_MEM_OP_NO_DUMMY,
+			   SPI_MEM_OP_DATA_IN(1, buf, 1));
+	ret = spi_mem_exec_op(nor->spimem, &op);
+	if (ret)
+		return ret;
+
+	if (*buf & SPINOR_REG_CYPRESS_CFR3V_PGSZ)
+		params->page_size = 512;
+	else
+		params->page_size = 256;
+
+	return 0;
+}
+
+static struct spi_nor_fixups s28hs512t_fixups = {
+	.default_init = s28hs512t_default_init,
+	.post_sfdp = s28hs512t_post_sfdp_fixup,
+	.post_bfpt = s28hs512t_post_bfpt_fixup,
+};
+
 static int
 s25fs_s_post_bfpt_fixups(struct spi_nor *nor,
 			 const struct sfdp_parameter_header *bfpt_header,
@@ -103,6 +263,11 @@ static const struct flash_info spansion_parts[] = {
 			     SPI_NOR_4B_OPCODES) },
 	{ "cy15x104q",  INFO6(0x042cc2, 0x7f7f7f, 512 * 1024, 1,
 			      SPI_NOR_NO_ERASE) },
+	{ "s28hs512t",   INFO(0x345b1a,      0, 256 * 1024, 256,
+			     SECT_4K | SPI_NOR_OCTAL_DTR_READ |
+			     SPI_NOR_OCTAL_DTR_PP)
+		.fixups = &s28hs512t_fixups,
+	},
 };
 
 static void spansion_post_sfdp_fixups(struct spi_nor *nor)
-- 
2.27.0


______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/

^ permalink raw reply	[flat|nested] 15+ messages in thread

* [PATCH v11 14/14] mtd: spi-nor: micron-st: allow using MT35XU512ABA in Octal DTR mode
  2020-07-23 13:11 [PATCH v11 00/14] mtd: spi-nor: add xSPI Octal DTR support Pratyush Yadav
                   ` (12 preceding siblings ...)
  2020-07-23 13:12 ` [PATCH v11 13/14] mtd: spi-nor: spansion: add support for Cypress Semper flash Pratyush Yadav
@ 2020-07-23 13:12 ` Pratyush Yadav
  13 siblings, 0 replies; 15+ messages in thread
From: Pratyush Yadav @ 2020-07-23 13:12 UTC (permalink / raw)
  To: Tudor Ambarus, Miquel Raynal, Richard Weinberger,
	Vignesh Raghavendra, linux-mtd, linux-kernel
  Cc: Pratyush Yadav, Boris Brezillon, Sekhar Nori, Pratyush Yadav

From: Pratyush Yadav <p.yadav@ti.com>

Since this flash doesn't have a Profile 1.0 table, the Octal DTR
capabilities are enabled in the post SFDP fixup, along with the 8D-8D-8D
fast read settings.

Enable Octal DTR mode with 20 dummy cycles to allow running at the
maximum supported frequency of 200Mhz.

The flash supports the soft reset sequence. So, add the flag in the
flash's info.

Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
---
 drivers/mtd/spi-nor/micron-st.c | 102 +++++++++++++++++++++++++++++++-
 1 file changed, 101 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/spi-nor/micron-st.c b/drivers/mtd/spi-nor/micron-st.c
index 3dca5b9af3b6..e34098661b11 100644
--- a/drivers/mtd/spi-nor/micron-st.c
+++ b/drivers/mtd/spi-nor/micron-st.c
@@ -8,10 +8,110 @@
 
 #include "core.h"
 
+#define SPINOR_OP_MT_DTR_RD	0xfd	/* Fast Read opcode in DTR mode */
+#define SPINOR_OP_MT_RD_ANY_REG	0x85	/* Read volatile register */
+#define SPINOR_OP_MT_WR_ANY_REG	0x81	/* Write volatile register */
+#define SPINOR_REG_MT_CFR0V	0x00	/* For setting octal DTR mode */
+#define SPINOR_REG_MT_CFR1V	0x01	/* For setting dummy cycles */
+#define SPINOR_MT_DTR_NO_DQS	0xc7	/* Enable Octal DTR without DQS. */
+#define SPINOR_MT_EXSPI		0xff	/* Enable Extended SPI (default) */
+
+static int spi_nor_micron_octal_dtr_enable(struct spi_nor *nor, bool enable)
+{
+	struct spi_mem_op op;
+	u8 *buf = nor->bouncebuf;
+	u8 addr_width;
+	int ret;
+
+	if (enable)
+		addr_width = 3;
+	else
+		addr_width = 4;
+
+	if (enable) {
+		/* Use 20 dummy cycles for memory array reads. */
+		ret = spi_nor_write_enable(nor);
+		if (ret)
+			return ret;
+
+		*buf = 20;
+		op = (struct spi_mem_op)
+			SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_MT_WR_ANY_REG, 1),
+				   SPI_MEM_OP_ADDR(addr_width,
+						   SPINOR_REG_MT_CFR1V, 1),
+				   SPI_MEM_OP_NO_DUMMY,
+				   SPI_MEM_OP_DATA_OUT(1, buf, 1));
+		ret = spi_mem_exec_op(nor->spimem, &op);
+		if (ret)
+			return ret;
+
+		ret = spi_nor_wait_till_ready(nor);
+		if (ret)
+			return ret;
+	}
+
+	ret = spi_nor_write_enable(nor);
+	if (ret)
+		return ret;
+
+	if (enable)
+		*buf = SPINOR_MT_DTR_NO_DQS;
+	else
+		*buf = SPINOR_MT_EXSPI;
+	op = (struct spi_mem_op)
+		SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_MT_WR_ANY_REG, 1),
+			   SPI_MEM_OP_ADDR(addr_width, SPINOR_REG_MT_CFR0V, 1),
+			   SPI_MEM_OP_NO_DUMMY,
+			   SPI_MEM_OP_DATA_OUT(1, buf, 1));
+
+	if (!enable)
+		spi_nor_spimem_setup_op(nor, &op, SNOR_PROTO_8_8_8_DTR);
+
+	ret = spi_mem_exec_op(nor->spimem, &op);
+	if (ret) {
+		dev_err(nor->dev, "Failed to enable octal DTR mode\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static void mt35xu512aba_default_init(struct spi_nor *nor)
+{
+	nor->params->octal_dtr_enable = spi_nor_micron_octal_dtr_enable;
+}
+
+static void mt35xu512aba_post_sfdp_fixup(struct spi_nor *nor)
+{
+	/* Set the Fast Read settings. */
+	nor->params->hwcaps.mask |= SNOR_HWCAPS_READ_8_8_8_DTR;
+	spi_nor_set_read_settings(&nor->params->reads[SNOR_CMD_READ_8_8_8_DTR],
+				  0, 20, SPINOR_OP_MT_DTR_RD,
+				  SNOR_PROTO_8_8_8_DTR);
+
+	nor->cmd_ext_type = SPI_NOR_EXT_REPEAT;
+	nor->params->rdsr_dummy = 8;
+	nor->params->rdsr_addr_nbytes = 0;
+
+	/*
+	 * The BFPT quad enable field is set to a reserved value so the quad
+	 * enable function is ignored by spi_nor_parse_bfpt(). Make sure we
+	 * disable it.
+	 */
+	nor->params->quad_enable = NULL;
+}
+
+static struct spi_nor_fixups mt35xu512aba_fixups = {
+	.default_init = mt35xu512aba_default_init,
+	.post_sfdp = mt35xu512aba_post_sfdp_fixup,
+};
+
 static const struct flash_info micron_parts[] = {
 	{ "mt35xu512aba", INFO(0x2c5b1a, 0, 128 * 1024, 512,
 			       SECT_4K | USE_FSR | SPI_NOR_OCTAL_READ |
-			       SPI_NOR_4B_OPCODES) },
+			       SPI_NOR_4B_OPCODES | SPI_NOR_OCTAL_DTR_READ |
+			       SPI_NOR_OCTAL_DTR_PP)
+		.fixups = &mt35xu512aba_fixups},
 	{ "mt35xu02g", INFO(0x2c5b1c, 0, 128 * 1024, 2048,
 			    SECT_4K | USE_FSR | SPI_NOR_OCTAL_READ |
 			    SPI_NOR_4B_OPCODES) },
-- 
2.27.0


______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/

^ permalink raw reply	[flat|nested] 15+ messages in thread

end of thread, back to index

Thread overview: 15+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-07-23 13:11 [PATCH v11 00/14] mtd: spi-nor: add xSPI Octal DTR support Pratyush Yadav
2020-07-23 13:11 ` [PATCH v11 01/14] mtd: spi-nor: core: add spi_nor_{read, write}_reg() helpers Pratyush Yadav
2020-07-23 13:11 ` [PATCH v11 02/14] mtd: spi-nor: core: add spi_nor_controller_ops_erase helper Pratyush Yadav
2020-07-23 13:11 ` [PATCH v11 03/14] mtd: spi-nor: add support for DTR protocol Pratyush Yadav
2020-07-23 13:11 ` [PATCH v11 04/14] mtd: spi-nor: sfdp: get command opcode extension type from BFPT Pratyush Yadav
2020-07-23 13:11 ` [PATCH v11 05/14] mtd: spi-nor: sfdp: parse xSPI Profile 1.0 table Pratyush Yadav
2020-07-23 13:11 ` [PATCH v11 06/14] mtd: spi-nor: core: use dummy cycle and address width info from SFDP Pratyush Yadav
2020-07-23 13:11 ` [PATCH v11 07/14] mtd: spi-nor: core: do 2 byte reads for SR and FSR in DTR mode Pratyush Yadav
2020-07-23 13:11 ` [PATCH v11 08/14] mtd: spi-nor: core: enable octal DTR mode when possible Pratyush Yadav
2020-07-23 13:11 ` [PATCH v11 09/14] mtd: spi-nor: sfdp: detect Soft Reset sequence support from BFPT Pratyush Yadav
2020-07-23 13:11 ` [PATCH v11 10/14] mtd: spi-nor: core: perform a Soft Reset on shutdown Pratyush Yadav
2020-07-23 13:12 ` [PATCH v11 11/14] mtd: spi-nor: core: disable Octal DTR mode on suspend Pratyush Yadav
2020-07-23 13:12 ` [PATCH v11 12/14] mtd: spi-nor: core: expose spi_nor_default_setup() in core.h Pratyush Yadav
2020-07-23 13:12 ` [PATCH v11 13/14] mtd: spi-nor: spansion: add support for Cypress Semper flash Pratyush Yadav
2020-07-23 13:12 ` [PATCH v11 14/14] mtd: spi-nor: micron-st: allow using MT35XU512ABA in Octal DTR mode Pratyush Yadav

Linux-mtd Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-mtd/0 linux-mtd/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-mtd linux-mtd/ https://lore.kernel.org/linux-mtd \
		linux-mtd@lists.infradead.org
	public-inbox-index linux-mtd

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.infradead.lists.linux-mtd


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git