spi-nor: fsl-quadspi:Support qspi for ls2080a

spi-nor: fsl-quadspi:Support qspi for ls2080a

[Yunhui Cui]

This patch set added the basic support for ls1021-twr/ls2080a-qds.

[PATCH 1/9] mtd:fsl-quadspi:use the property fields of SPI-NOR

[Yunhui Cui]

We can get the read/write/erase opcode from the spi nor framework
directly. This patch uses the information stored in the SPI-NOR to
remove the hardcode in the fsl_qspi_init_lut().

Signed-off-by: Yunhui Cui <B56489@freescale.com>
Signed-off-by: Yunhui Cui <yunhui.cui@nxp.com>
---
 drivers/mtd/spi-nor/fsl-quadspi.c | 40 ++++++++++++---------------------------
 1 file changed, 12 insertions(+), 28 deletions(-)

diff --git a/drivers/mtd/spi-nor/fsl-quadspi.c b/drivers/mtd/spi-nor/fsl-quadspi.c
index 9ab2b51..517ffe2 100644
--- a/drivers/mtd/spi-nor/fsl-quadspi.c
+++ b/drivers/mtd/spi-nor/fsl-quadspi.c
@@ -373,9 +373,13 @@ static void fsl_qspi_init_lut(struct fsl_qspi *q)
 	void __iomem *base = q->iobase;
 	int rxfifo = q->devtype_data->rxfifo;
 	u32 lut_base;
-	u8 cmd, addrlen, dummy;
 	int i;
 
+	struct spi_nor *nor = &q->nor[0];
+	u8 addrlen = (nor->addr_width == 3) ? ADDR24BIT : ADDR32BIT;
+	u8 read_op = nor->read_opcode;
+	u8 read_dm = nor->read_dummy;
+
 	fsl_qspi_unlock_lut(q);
 
 	/* Clear all the LUT table */
@@ -385,20 +389,10 @@ static void fsl_qspi_init_lut(struct fsl_qspi *q)
 	/* Quad Read */
 	lut_base = SEQID_QUAD_READ * 4;
 
-	if (q->nor_size <= SZ_16M) {
-		cmd = SPINOR_OP_READ_1_1_4;
-		addrlen = ADDR24BIT;
-		dummy = 8;
-	} else {
-		/* use the 4-byte address */
-		cmd = SPINOR_OP_READ_1_1_4;
-		addrlen = ADDR32BIT;
-		dummy = 8;
-	}
-
-	qspi_writel(q, LUT0(CMD, PAD1, cmd) | LUT1(ADDR, PAD1, addrlen),
+	qspi_writel(q, LUT0(CMD, PAD1, read_op) | LUT1(ADDR, PAD1, addrlen),
 			base + QUADSPI_LUT(lut_base));
-	qspi_writel(q, LUT0(DUMMY, PAD1, dummy) | LUT1(FSL_READ, PAD4, rxfifo),
+	qspi_writel(q, LUT0(DUMMY, PAD1, read_dm) |
+		    LUT1(FSL_READ, PAD4, rxfifo),
 			base + QUADSPI_LUT(lut_base + 1));
 
 	/* Write enable */
@@ -409,16 +403,8 @@ static void fsl_qspi_init_lut(struct fsl_qspi *q)
 	/* Page Program */
 	lut_base = SEQID_PP * 4;
 
-	if (q->nor_size <= SZ_16M) {
-		cmd = SPINOR_OP_PP;
-		addrlen = ADDR24BIT;
-	} else {
-		/* use the 4-byte address */
-		cmd = SPINOR_OP_PP;
-		addrlen = ADDR32BIT;
-	}
-
-	qspi_writel(q, LUT0(CMD, PAD1, cmd) | LUT1(ADDR, PAD1, addrlen),
+	qspi_writel(q, LUT0(CMD, PAD1, nor->program_opcode) |
+		    LUT1(ADDR, PAD1, addrlen),
 			base + QUADSPI_LUT(lut_base));
 	qspi_writel(q, LUT0(FSL_WRITE, PAD1, 0),
 			base + QUADSPI_LUT(lut_base + 1));
@@ -432,10 +418,8 @@ static void fsl_qspi_init_lut(struct fsl_qspi *q)
 	/* Erase a sector */
 	lut_base = SEQID_SE * 4;
 
-	cmd = q->nor[0].erase_opcode;
-	addrlen = q->nor_size <= SZ_16M ? ADDR24BIT : ADDR32BIT;
-
-	qspi_writel(q, LUT0(CMD, PAD1, cmd) | LUT1(ADDR, PAD1, addrlen),
+	qspi_writel(q, LUT0(CMD, PAD1, nor->erase_opcode) |
+		    LUT1(ADDR, PAD1, addrlen),
 			base + QUADSPI_LUT(lut_base));
 
 	/* Erase the whole chip */
-- 
2.1.0.27.g96db324

[PATCH 2/9] mtd: fsl-quadspi: Rename SEQID_QUAD_READ to SEQID_READ

[Yunhui Cui]

There are some read modes for flash, such as NORMAL, FAST,
QUAD, DDR QUAD. These modes will use the identical lut table base
So rename SEQID_QUAD_READ to SEQID_READ.

Signed-off-by: Yunhui Cui <B56489@freescale.com>
Signed-off-by: Yunhui Cui <yunhui.cui@nxp.com>
---
 drivers/mtd/spi-nor/fsl-quadspi.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/mtd/spi-nor/fsl-quadspi.c b/drivers/mtd/spi-nor/fsl-quadspi.c
index 517ffe2..9861290 100644
--- a/drivers/mtd/spi-nor/fsl-quadspi.c
+++ b/drivers/mtd/spi-nor/fsl-quadspi.c
@@ -193,7 +193,7 @@
 #define QUADSPI_LUT_NUM		64
 
 /* SEQID -- we can have 16 seqids at most. */
-#define SEQID_QUAD_READ		0
+#define SEQID_READ		0
 #define SEQID_WREN		1
 #define SEQID_WRDI		2
 #define SEQID_RDSR		3
@@ -386,8 +386,8 @@ static void fsl_qspi_init_lut(struct fsl_qspi *q)
 	for (i = 0; i < QUADSPI_LUT_NUM; i++)
 		qspi_writel(q, 0, base + QUADSPI_LUT_BASE + i * 4);
 
-	/* Quad Read */
-	lut_base = SEQID_QUAD_READ * 4;
+	/* Read */
+	lut_base = SEQID_READ * 4;
 
 	qspi_writel(q, LUT0(CMD, PAD1, read_op) | LUT1(ADDR, PAD1, addrlen),
 			base + QUADSPI_LUT(lut_base));
@@ -468,7 +468,7 @@ static int fsl_qspi_get_seqid(struct fsl_qspi *q, u8 cmd)
 {
 	switch (cmd) {
 	case SPINOR_OP_READ_1_1_4:
-		return SEQID_QUAD_READ;
+		return SEQID_READ;
 	case SPINOR_OP_WREN:
 		return SEQID_WREN;
 	case SPINOR_OP_WRDI:
-- 
2.1.0.27.g96db324

[PATCH 3/9] mtd: spi-nor: fsl-quadspi: add fast-read mode support

[Yunhui Cui]

From: Yunhui Cui <yunhui.cui@nxp.com>

The qspi driver add generic fast-read mode for different
flash venders. There are some different board flash work on
different mode, such fast-read, quad-mode.

Signed-off-by: Yunhui Cui <yunhui.cui@nxp.com>
---
 drivers/mtd/spi-nor/fsl-quadspi.c | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

diff --git a/drivers/mtd/spi-nor/fsl-quadspi.c b/drivers/mtd/spi-nor/fsl-quadspi.c
index 9861290..09adaa4 100644
--- a/drivers/mtd/spi-nor/fsl-quadspi.c
+++ b/drivers/mtd/spi-nor/fsl-quadspi.c
@@ -389,11 +389,21 @@ static void fsl_qspi_init_lut(struct fsl_qspi *q)
 	/* Read */
 	lut_base = SEQID_READ * 4;
 
-	qspi_writel(q, LUT0(CMD, PAD1, read_op) | LUT1(ADDR, PAD1, addrlen),
-			base + QUADSPI_LUT(lut_base));
-	qspi_writel(q, LUT0(DUMMY, PAD1, read_dm) |
-		    LUT1(FSL_READ, PAD4, rxfifo),
-			base + QUADSPI_LUT(lut_base + 1));
+	if (nor->flash_read == SPI_NOR_FAST) {
+		qspi_writel(q, LUT0(CMD, PAD1, read_op) |
+			    LUT1(ADDR, PAD1, addrlen),
+				base + QUADSPI_LUT(lut_base));
+		qspi_writel(q,  LUT0(DUMMY, PAD1, read_dm) |
+			    LUT1(FSL_READ, PAD1, rxfifo),
+				base + QUADSPI_LUT(lut_base + 1));
+	} else if (nor->flash_read == SPI_NOR_QUAD) {
+		qspi_writel(q, LUT0(CMD, PAD1, read_op) |
+			    LUT1(ADDR, PAD1, addrlen),
+				base + QUADSPI_LUT(lut_base));
+		qspi_writel(q, LUT0(DUMMY, PAD1, read_dm) |
+			    LUT1(FSL_READ, PAD4, rxfifo),
+				base + QUADSPI_LUT(lut_base + 1));
+	}
 
 	/* Write enable */
 	lut_base = SEQID_WREN * 4;
@@ -468,6 +478,7 @@ static int fsl_qspi_get_seqid(struct fsl_qspi *q, u8 cmd)
 {
 	switch (cmd) {
 	case SPINOR_OP_READ_1_1_4:
+	case SPINOR_OP_READ_FAST:
 		return SEQID_READ;
 	case SPINOR_OP_WREN:
 		return SEQID_WREN;
-- 
2.1.0.27.g96db324

[PATCH 4/9] mtd: spi-nor: fsl-quadspi: extend support for some special requerment.

[Yunhui Cui]

From: Yunhui Cui <yunhui.cui@nxp.com>

Add extra info in LUT table to support some special requerments.
Spansion S25FS-S family flash need some special operations.

Signed-off-by: Yunhui Cui <yunhui.cui@nxp.com>
---
 drivers/mtd/spi-nor/fsl-quadspi.c | 44 +++++++++++++++++++++++++++++++++++++--
 include/linux/mtd/spi-nor.h       |  4 ++++
 2 files changed, 46 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/spi-nor/fsl-quadspi.c b/drivers/mtd/spi-nor/fsl-quadspi.c
index 09adaa4..16ebabbd 100644
--- a/drivers/mtd/spi-nor/fsl-quadspi.c
+++ b/drivers/mtd/spi-nor/fsl-quadspi.c
@@ -205,6 +205,9 @@
 #define SEQID_RDCR		9
 #define SEQID_EN4B		10
 #define SEQID_BRWR		11
+#define SEQID_RDAR		12
+#define SEQID_WRAR		13
+
 
 #define QUADSPI_MIN_IOMAP SZ_4M
 
@@ -470,6 +473,28 @@ static void fsl_qspi_init_lut(struct fsl_qspi *q)
 	qspi_writel(q, LUT0(CMD, PAD1, SPINOR_OP_BRWR),
 			base + QUADSPI_LUT(lut_base));
 
+	/*
+	 * Read any device register.
+	 * Used for Spansion S25FS-S family flash only.
+	 */
+	lut_base = SEQID_RDAR * 4;
+	qspi_writel(q, LUT0(CMD, PAD1, SPINOR_OP_SPANSION_RDAR) |
+			LUT1(ADDR, PAD1, ADDR24BIT),
+			base + QUADSPI_LUT(lut_base));
+	qspi_writel(q, LUT0(DUMMY, PAD1, 8) | LUT1(FSL_READ, PAD1, 1),
+			base + QUADSPI_LUT(lut_base + 1));
+
+	/*
+	 * Write any device register.
+	 * Used for Spansion S25FS-S family flash only.
+	 */
+	lut_base = SEQID_WRAR * 4;
+	qspi_writel(q, LUT0(CMD, PAD1, SPINOR_OP_SPANSION_WRAR) |
+			LUT1(ADDR, PAD1, ADDR24BIT),
+			base + QUADSPI_LUT(lut_base));
+	qspi_writel(q, LUT0(FSL_WRITE, PAD1, 1),
+			base + QUADSPI_LUT(lut_base + 1));
+
 	fsl_qspi_lock_lut(q);
 }
 
@@ -477,9 +502,15 @@ static void fsl_qspi_init_lut(struct fsl_qspi *q)
 static int fsl_qspi_get_seqid(struct fsl_qspi *q, u8 cmd)
 {
 	switch (cmd) {
+	case SPINOR_OP_READ4_1_1_4:
 	case SPINOR_OP_READ_1_1_4:
 	case SPINOR_OP_READ_FAST:
+	case SPINOR_OP_READ4_FAST:
 		return SEQID_READ;
+	case SPINOR_OP_SPANSION_RDAR:
+		return SEQID_RDAR;
+	case SPINOR_OP_SPANSION_WRAR:
+		return SEQID_WRAR;
 	case SPINOR_OP_WREN:
 		return SEQID_WREN;
 	case SPINOR_OP_WRDI:
@@ -491,6 +522,7 @@ static int fsl_qspi_get_seqid(struct fsl_qspi *q, u8 cmd)
 	case SPINOR_OP_CHIP_ERASE:
 		return SEQID_CHIP_ERASE;
 	case SPINOR_OP_PP:
+	case SPINOR_OP_PP_4B:
 		return SEQID_PP;
 	case SPINOR_OP_RDID:
 		return SEQID_RDID;
@@ -830,8 +862,12 @@ static int fsl_qspi_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
 {
 	int ret;
 	struct fsl_qspi *q = nor->priv;
+	u32 to = 0;
+
+	if (opcode == SPINOR_OP_SPANSION_RDAR)
+		memcpy(&to, nor->cmd_buf, 4);
 
-	ret = fsl_qspi_runcmd(q, opcode, 0, len);
+	ret = fsl_qspi_runcmd(q, opcode, to, len);
 	if (ret)
 		return ret;
 
@@ -843,9 +879,13 @@ static int fsl_qspi_write_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
 {
 	struct fsl_qspi *q = nor->priv;
 	int ret;
+	u32 to = 0;
+
+	if (opcode == SPINOR_OP_SPANSION_WRAR)
+		memcpy(&to, nor->cmd_buf, 4);
 
 	if (!buf) {
-		ret = fsl_qspi_runcmd(q, opcode, 0, 1);
+		ret = fsl_qspi_runcmd(q, opcode, to, 1);
 		if (ret)
 			return ret;
 
diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h
index 3c36113..fd0631b 100644
--- a/include/linux/mtd/spi-nor.h
+++ b/include/linux/mtd/spi-nor.h
@@ -74,6 +74,10 @@
 /* Used for Spansion flashes only. */
 #define SPINOR_OP_BRWR		0x17	/* Bank register write */
 
+/* Used for Spansion S25FS-S family flash only. */
+#define SPINOR_OP_SPANSION_RDAR	0x65	/* Read any device register */
+#define SPINOR_OP_SPANSION_WRAR	0x71	/* Write any device register */
+
 /* Used for Micron flashes only. */
 #define SPINOR_OP_RD_EVCR      0x65    /* Read EVCR register */
 #define SPINOR_OP_WD_EVCR      0x61    /* Write EVCR register */
-- 
2.1.0.27.g96db324

[PATCH 5/9] mtd: spi-nor: fsl-quadspi:Support qspi for ls2080a

[Yunhui Cui]

There is a hardware feature that qspi_amba_base is added
internally by SOC design on ls2080a. So as to software, the driver
need support to the feature.

Signed-off-by: Yunhui Cui <B56489@freescale.com>
Signed-off-by: Yunhui Cui <yunhui.cui@nxp.com>
---
 drivers/mtd/spi-nor/fsl-quadspi.c | 24 ++++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/spi-nor/fsl-quadspi.c b/drivers/mtd/spi-nor/fsl-quadspi.c
index 16ebabbd..5d9d192 100644
--- a/drivers/mtd/spi-nor/fsl-quadspi.c
+++ b/drivers/mtd/spi-nor/fsl-quadspi.c
@@ -41,6 +41,8 @@
 #define QUADSPI_QUIRK_TKT253890		(1 << 2)
 /* Controller cannot wake up from wait mode, TKT245618 */
 #define QUADSPI_QUIRK_TKT245618         (1 << 3)
+/* QSPI_AMBA_BASE is internally added by SOC design */
+#define QUADSPI_AMBA_BASE_INTERNAL	(0x10000)
 
 /* The registers */
 #define QUADSPI_MCR			0x00
@@ -217,6 +219,7 @@ enum fsl_qspi_devtype {
 	FSL_QUADSPI_IMX7D,
 	FSL_QUADSPI_IMX6UL,
 	FSL_QUADSPI_LS1021A,
+	FSL_QUADSPI_LS2080A,
 };
 
 struct fsl_qspi_devtype_data {
@@ -270,6 +273,14 @@ static struct fsl_qspi_devtype_data ls1021a_data = {
 	.driver_data = 0,
 };
 
+static struct fsl_qspi_devtype_data ls2080a_data = {
+	.devtype = FSL_QUADSPI_LS2080A,
+	.rxfifo = 128,
+	.txfifo = 64,
+	.ahb_buf_size = 1024,
+	.driver_data = QUADSPI_AMBA_BASE_INTERNAL,
+};
+
 #define FSL_QSPI_MAX_CHIP	4
 struct fsl_qspi {
 	struct spi_nor nor[FSL_QSPI_MAX_CHIP];
@@ -312,6 +323,11 @@ static inline int needs_wakeup_wait_mode(struct fsl_qspi *q)
 	return q->devtype_data->driver_data & QUADSPI_QUIRK_TKT245618;
 }
 
+static inline int has_added_amba_base_internal(struct fsl_qspi *q)
+{
+	return q->devtype_data->driver_data & QUADSPI_AMBA_BASE_INTERNAL;
+}
+
 /*
  * R/W functions for big- or little-endian registers:
  * The qSPI controller's endian is independent of the CPU core's endian.
@@ -558,8 +574,11 @@ fsl_qspi_runcmd(struct fsl_qspi *q, u8 cmd, unsigned int addr, int len)
 	/* save the reg */
 	reg = qspi_readl(q, base + QUADSPI_MCR);
 
-	qspi_writel(q, q->memmap_phy + q->chip_base_addr + addr,
-			base + QUADSPI_SFAR);
+	if (has_added_amba_base_internal(q))
+		qspi_writel(q, q->chip_base_addr + addr, base + QUADSPI_SFAR);
+	else
+		qspi_writel(q, q->memmap_phy + q->chip_base_addr + addr,
+			    base + QUADSPI_SFAR);
 	qspi_writel(q, QUADSPI_RBCT_WMRK_MASK | QUADSPI_RBCT_RXBRD_USEIPS,
 			base + QUADSPI_RBCT);
 	qspi_writel(q, reg | QUADSPI_MCR_CLR_RXF_MASK, base + QUADSPI_MCR);
@@ -849,6 +868,7 @@ static const struct of_device_id fsl_qspi_dt_ids[] = {
 	{ .compatible = "fsl,imx7d-qspi", .data = (void *)&imx7d_data, },
 	{ .compatible = "fsl,imx6ul-qspi", .data = (void *)&imx6ul_data, },
 	{ .compatible = "fsl,ls1021a-qspi", .data = (void *)&ls1021a_data, },
+	{ .compatible = "fsl,ls2080a-qspi", .data = (void *)&ls2080a_data, },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, fsl_qspi_dt_ids);
-- 
2.1.0.27.g96db324

[PATCH 6/9] mtd: spi-nor: Support R/W for S25FS-S family flash

[Yunhui Cui]

From: Yunhui Cui <yunhui.cui@nxp.com>

With the physical sectors combination, S25FS-S family flash
requires some special operations for read/write functions.

Signed-off-by: Yunhui Cui <yunhui.cui@nxp.com>
---
 drivers/mtd/spi-nor/spi-nor.c | 59 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)

diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index 157841d..91ee920 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -39,6 +39,10 @@
 
 #define SPI_NOR_MAX_ID_LEN	6
 #define SPI_NOR_MAX_ADDR_WIDTH	4
+/* Added for S25FS-S family flash */
+#define SPINOR_CONFIG_REG3_OFFSET      0x800004
+#define CR3V_4KB_ERASE_UNABLE  0x8
+#define SPINOR_S25FS_FAMILY_ID 0x81
 
 struct flash_info {
 	char		*name;
@@ -78,6 +82,7 @@ struct flash_info {
 };
 
 #define JEDEC_MFR(info)	((info)->id[0])
+#define EXT_ID(info)	((info)->id[5])
 
 static const struct flash_info *spi_nor_match_id(const char *name);
 
@@ -881,6 +886,7 @@ static const struct flash_info spi_nor_ids[] = {
 	 */
 	{ "s25sl032p",  INFO(0x010215, 0x4d00,  64 * 1024,  64, SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
 	{ "s25sl064p",  INFO(0x010216, 0x4d00,  64 * 1024, 128, SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
+	{ "s25fs256s1", INFO6(0x010219, 0x4d0181, 64 * 1024, 512, 0)},
 	{ "s25fl256s0", INFO(0x010219, 0x4d00, 256 * 1024, 128, 0) },
 	{ "s25fl256s1", INFO(0x010219, 0x4d01,  64 * 1024, 512, SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
 	{ "s25fl512s",  INFO(0x010220, 0x4d00, 256 * 1024, 256, SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
@@ -1018,6 +1024,53 @@ static const struct flash_info *spi_nor_read_id(struct spi_nor *nor)
 	return ERR_PTR(-ENODEV);
 }
 
+/*
+ * The S25FS-S family physical sectors may be configured as a
+ * hybrid combination of eight 4-kB parameter sectors
+ * at the top or bottom of the address space with all
+ * but one of the remaining sectors being uniform size.
+ * The Parameter Sector Erase commands (20h or 21h) must
+ * be used to erase the 4-kB parameter sectors individually.
+ * The Sector (uniform sector) Erase commands (D8h or DCh)
+ * must be used to erase any of the remaining
+ * sectors, including the portion of highest or lowest address
+ * sector that is not overlaid by the parameter sectors.
+ * The uniform sector erase command has no effect on parameter sectors.
+ */
+static int spansion_s25fs_disable_4kb_erase(struct spi_nor *nor)
+{
+	struct fsl_qspi *q;
+	u32 cr3v_addr  = SPINOR_CONFIG_REG3_OFFSET;
+	u8 cr3v = 0x0;
+	int ret = 0x0;
+
+	q = nor->priv;
+
+	nor->cmd_buf[2] = cr3v_addr >> 16;
+	nor->cmd_buf[1] = cr3v_addr >> 8;
+	nor->cmd_buf[0] = cr3v_addr >> 0;
+
+	ret = nor->read_reg(nor, SPINOR_OP_SPANSION_RDAR, &cr3v, 1);
+	if (ret)
+		return ret;
+	if (cr3v & CR3V_4KB_ERASE_UNABLE)
+		return 0;
+	ret = nor->write_reg(nor, SPINOR_OP_WREN, NULL, 0);
+	if (ret)
+		return ret;
+	cr3v = CR3V_4KB_ERASE_UNABLE;
+	nor->program_opcode = SPINOR_OP_SPANSION_WRAR;
+	nor->write(nor, cr3v_addr, 1, NULL, &cr3v);
+
+	ret = nor->read_reg(nor, SPINOR_OP_SPANSION_RDAR, &cr3v, 1);
+	if (ret)
+		return ret;
+	if (!(cr3v & CR3V_4KB_ERASE_UNABLE))
+		return -EPERM;
+
+	return 0;
+}
+
 static int spi_nor_read(struct mtd_info *mtd, loff_t from, size_t len,
 			size_t *retlen, u_char *buf)
 {
@@ -1311,6 +1364,12 @@ int spi_nor_scan(struct spi_nor *nor, const char *name, enum read_mode mode)
 		spi_nor_wait_till_ready(nor);
 	}
 
+	if (EXT_ID(info) == SPINOR_S25FS_FAMILY_ID) {
+		ret = spansion_s25fs_disable_4kb_erase(nor);
+		if (ret)
+			return ret;
+	}
+
 	if (!mtd->name)
 		mtd->name = dev_name(dev);
 	mtd->priv = nor;
-- 
2.1.0.27.g96db324

[PATCH 7/9] mtd: fsl-quadspi: Solve Micron Spansion flash command conflict

[Yunhui Cui]

From: Yunhui Cui <yunhui.cui@nxp.com>

Add some lut_tables to support quad mode for flash n25q128
on the board ls1021a-twr and solve flash Spansion and Micron
command conflict.
In switch {}, The value of command SPINOR_OP_RD_EVCR and
SPINOR_OP_SPANSION_RDAR is the same. They have to share
the same seq_id: SEQID_RDAR_OR_RD_EVCR.

Signed-off-by: Yunhui Cui <yunhui.cui@nxp.com>
---
 drivers/mtd/spi-nor/fsl-quadspi.c | 47 ++++++++++++++++++++++++++++++---------
 1 file changed, 36 insertions(+), 11 deletions(-)

diff --git a/drivers/mtd/spi-nor/fsl-quadspi.c b/drivers/mtd/spi-nor/fsl-quadspi.c
index 5d9d192..fea18b6 100644
--- a/drivers/mtd/spi-nor/fsl-quadspi.c
+++ b/drivers/mtd/spi-nor/fsl-quadspi.c
@@ -207,9 +207,9 @@
 #define SEQID_RDCR		9
 #define SEQID_EN4B		10
 #define SEQID_BRWR		11
-#define SEQID_RDAR		12
+#define SEQID_RDAR_OR_RD_EVCR	12
 #define SEQID_WRAR		13
-
+#define SEQID_WD_EVCR           14
 
 #define QUADSPI_MIN_IOMAP SZ_4M
 
@@ -393,6 +393,7 @@ static void fsl_qspi_init_lut(struct fsl_qspi *q)
 	int rxfifo = q->devtype_data->rxfifo;
 	u32 lut_base;
 	int i;
+	const struct fsl_qspi_devtype_data *devtype_data = q->devtype_data;
 
 	struct spi_nor *nor = &q->nor[0];
 	u8 addrlen = (nor->addr_width == 3) ? ADDR24BIT : ADDR32BIT;
@@ -489,16 +490,26 @@ static void fsl_qspi_init_lut(struct fsl_qspi *q)
 	qspi_writel(q, LUT0(CMD, PAD1, SPINOR_OP_BRWR),
 			base + QUADSPI_LUT(lut_base));
 
+
 	/*
-	 * Read any device register.
-	 * Used for Spansion S25FS-S family flash only.
+	 * Flash Micron and Spansion command confilict
+	 * use the same value 0x65. But it indicates different meaning.
 	 */
-	lut_base = SEQID_RDAR * 4;
-	qspi_writel(q, LUT0(CMD, PAD1, SPINOR_OP_SPANSION_RDAR) |
-			LUT1(ADDR, PAD1, ADDR24BIT),
-			base + QUADSPI_LUT(lut_base));
-	qspi_writel(q, LUT0(DUMMY, PAD1, 8) | LUT1(FSL_READ, PAD1, 1),
-			base + QUADSPI_LUT(lut_base + 1));
+	lut_base = SEQID_RDAR_OR_RD_EVCR * 4;
+	if (devtype_data->devtype == FSL_QUADSPI_LS2080A) {
+		/*
+		* Read any device register.
+		* Used for Spansion S25FS-S family flash only.
+		*/
+		qspi_writel(q, LUT0(CMD, PAD1, SPINOR_OP_SPANSION_RDAR) |
+			    LUT1(ADDR, PAD1, ADDR24BIT),
+			    base + QUADSPI_LUT(lut_base));
+		qspi_writel(q, LUT0(DUMMY, PAD1, 8) | LUT1(FSL_READ, PAD1, 1),
+			    base + QUADSPI_LUT(lut_base + 1));
+	} else {
+		qspi_writel(q, LUT0(CMD, PAD1, SPINOR_OP_RD_EVCR),
+			    base + QUADSPI_LUT(lut_base));
+	}
 
 	/*
 	 * Write any device register.
@@ -511,6 +522,11 @@ static void fsl_qspi_init_lut(struct fsl_qspi *q)
 	qspi_writel(q, LUT0(FSL_WRITE, PAD1, 1),
 			base + QUADSPI_LUT(lut_base + 1));
 
+	/* Write EVCR register */
+	lut_base = SEQID_WD_EVCR * 4;
+	qspi_writel(q, LUT0(CMD, PAD1, SPINOR_OP_WD_EVCR),
+		    base + QUADSPI_LUT(lut_base));
+
 	fsl_qspi_lock_lut(q);
 }
 
@@ -523,8 +539,15 @@ static int fsl_qspi_get_seqid(struct fsl_qspi *q, u8 cmd)
 	case SPINOR_OP_READ_FAST:
 	case SPINOR_OP_READ4_FAST:
 		return SEQID_READ;
+	/*
+	 * Spansion & Micron use the same command value 0x65
+	 * Spansion: SPINOR_OP_SPANSION_RDAR, read any register.
+	 * Micron: SPINOR_OP_RD_EVCR,
+	 * read enhanced volatile configuration register.
+	 * case SPINOR_OP_RD_EVCR:
+	 */
 	case SPINOR_OP_SPANSION_RDAR:
-		return SEQID_RDAR;
+		return SEQID_RDAR_OR_RD_EVCR;
 	case SPINOR_OP_SPANSION_WRAR:
 		return SEQID_WRAR;
 	case SPINOR_OP_WREN:
@@ -550,6 +573,8 @@ static int fsl_qspi_get_seqid(struct fsl_qspi *q, u8 cmd)
 		return SEQID_EN4B;
 	case SPINOR_OP_BRWR:
 		return SEQID_BRWR;
+	case SPINOR_OP_WD_EVCR:
+		return SEQID_WD_EVCR;
 	default:
 		if (cmd == q->nor[0].erase_opcode)
 			return SEQID_SE;
-- 
2.1.0.27.g96db324

[PATCH 8/9] mtd: fsl-quadspi: disable AHB buffer prefetch

[Yunhui Cui]

From: Yunhui Cui <yunhui.cui@nxp.com>

A-009282: QuadSPI: QuadSPI data pre-fetch can result in incorrect data
Affects: QuadSPI
Description: With AHB buffer prefetch enabled, the QuadSPI may return
incorrect data on the AHB
interface. The buffer pre-fetch is enabled if the fetch size as
configured either in the LUT or in
the BUFxCR register is greater than 8 bytes.
Impact: Only 64 bit read allowed.
Workaround: Keep the read data size to 64 bits (8 Bytes), which disables
the prefetch on the AHB buffer,
and prevents this issue from occurring.

Signed-off-by: Yunhui Cui <yunhui.cui@nxp.com>
---
 drivers/mtd/spi-nor/fsl-quadspi.c | 29 +++++++++++++++++++++++------
 1 file changed, 23 insertions(+), 6 deletions(-)

diff --git a/drivers/mtd/spi-nor/fsl-quadspi.c b/drivers/mtd/spi-nor/fsl-quadspi.c
index fea18b6..d9f3e50 100644
--- a/drivers/mtd/spi-nor/fsl-quadspi.c
+++ b/drivers/mtd/spi-nor/fsl-quadspi.c
@@ -752,19 +752,36 @@ static void fsl_qspi_init_abh_read(struct fsl_qspi *q)
 {
 	void __iomem *base = q->iobase;
 	int seqid;
+	const struct fsl_qspi_devtype_data *devtype_data = q->devtype_data;
 
 	/* AHB configuration for access buffer 0/1/2 .*/
 	qspi_writel(q, QUADSPI_BUFXCR_INVALID_MSTRID, base + QUADSPI_BUF0CR);
 	qspi_writel(q, QUADSPI_BUFXCR_INVALID_MSTRID, base + QUADSPI_BUF1CR);
 	qspi_writel(q, QUADSPI_BUFXCR_INVALID_MSTRID, base + QUADSPI_BUF2CR);
+
 	/*
-	 * Set ADATSZ with the maximum AHB buffer size to improve the
-	 * read performance.
+	 * Errata: A-009282: QuadSPI data prefetch may result in incorrect data
+	 * Workaround: Keep the read data size to 64 bits (8 bytes).
+	 * This disables the prefetch on the AHB buffer and
+	 * prevents this issue from occurring.
 	 */
-	qspi_writel(q, QUADSPI_BUF3CR_ALLMST_MASK |
-			((q->devtype_data->ahb_buf_size / 8)
-			<< QUADSPI_BUF3CR_ADATSZ_SHIFT),
-			base + QUADSPI_BUF3CR);
+	if (devtype_data->devtype == FSL_QUADSPI_LS2080A ||
+	    devtype_data->devtype == FSL_QUADSPI_LS1021A) {
+
+		qspi_writel(q, QUADSPI_BUF3CR_ALLMST_MASK |
+				(1 << QUADSPI_BUF3CR_ADATSZ_SHIFT),
+				base + QUADSPI_BUF3CR);
+
+	} else {
+		/*
+		 * Set ADATSZ with the maximum AHB buffer size to improve the
+		 * read performance.
+		*/
+		qspi_writel(q, QUADSPI_BUF3CR_ALLMST_MASK |
+				((q->devtype_data->ahb_buf_size / 8)
+				<< QUADSPI_BUF3CR_ADATSZ_SHIFT),
+				base + QUADSPI_BUF3CR);
+	}
 
 	/* We only use the buffer3 */
 	qspi_writel(q, 0, base + QUADSPI_BUF0IND);
-- 
2.1.0.27.g96db324

[PATCH 9/9] mtd: fsl-quadspi: add multi flash chip R/W on ls2080a

[Yunhui Cui]

From: Yunhui Cui <yunhui.cui@nxp.com>

There is a hardware feature that qspi_amba_base is added
internally by SOC design on ls2080a. so memmap_phy need not
be added in driver. If memmap_phy is added, the flash A1
addr space is [0, memmap_phy] which far more than flash size.
The AMBA memory will be divided into four parts and assign to
every chipselect. Every channel will has two valid chipselects.

Signed-off-by: Yunhui Cui <yunhui.cui@nxp.com>
---
 drivers/mtd/spi-nor/fsl-quadspi.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/mtd/spi-nor/fsl-quadspi.c b/drivers/mtd/spi-nor/fsl-quadspi.c
index d9f3e50..cab2829 100644
--- a/drivers/mtd/spi-nor/fsl-quadspi.c
+++ b/drivers/mtd/spi-nor/fsl-quadspi.c
@@ -728,11 +728,17 @@ static void fsl_qspi_set_map_addr(struct fsl_qspi *q)
 {
 	int nor_size = q->nor_size;
 	void __iomem *base = q->iobase;
+	u32 mem_base;
 
-	qspi_writel(q, nor_size + q->memmap_phy, base + QUADSPI_SFA1AD);
-	qspi_writel(q, nor_size * 2 + q->memmap_phy, base + QUADSPI_SFA2AD);
-	qspi_writel(q, nor_size * 3 + q->memmap_phy, base + QUADSPI_SFB1AD);
-	qspi_writel(q, nor_size * 4 + q->memmap_phy, base + QUADSPI_SFB2AD);
+	if (has_added_amba_base_internal(q))
+		mem_base = 0x0;
+	else
+		mem_base = q->memmap_phy;
+
+	qspi_writel(q, nor_size + mem_base, base + QUADSPI_SFA1AD);
+	qspi_writel(q, nor_size * 2 + mem_base, base + QUADSPI_SFA2AD);
+	qspi_writel(q, nor_size * 3 + mem_base, base + QUADSPI_SFB1AD);
+	qspi_writel(q, nor_size * 4 + mem_base, base + QUADSPI_SFB2AD);
 }
 
 /*
-- 
2.1.0.27.g96db324

Re: [PATCH 6/9] mtd: spi-nor: Support R/W for S25FS-S family flash

[Han Xu]

________________________________________
From: Yunhui Cui <B56489@freescale.com>
Sent: Wednesday, April 13, 2016 9:50 PM
To: dwmw2@infradead.org; computersforpeace@gmail.com; han.xu@freescale.com
Cc: linux-kernel@vger.kernel.org; linux-mtd@lists.infradead.org; linux-arm-kernel@lists.infradead.org; Yao Yuan; Yunhui Cui
Subject: [PATCH 6/9] mtd: spi-nor: Support R/W for S25FS-S family flash

From: Yunhui Cui <yunhui.cui@nxp.com>

With the physical sectors combination, S25FS-S family flash
requires some special operations for read/write functions.

Signed-off-by: Yunhui Cui <yunhui.cui@nxp.com>
---
 drivers/mtd/spi-nor/spi-nor.c | 59 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)

diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index 157841d..91ee920 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -39,6 +39,10 @@

 #define SPI_NOR_MAX_ID_LEN     6
 #define SPI_NOR_MAX_ADDR_WIDTH 4
+/* Added for S25FS-S family flash */
+#define SPINOR_CONFIG_REG3_OFFSET      0x800004
+#define CR3V_4KB_ERASE_UNABLE  0x8
+#define SPINOR_S25FS_FAMILY_ID 0x81

 struct flash_info {
        char            *name;
@@ -78,6 +82,7 @@ struct flash_info {
 };

 #define JEDEC_MFR(info)        ((info)->id[0])
+#define EXT_ID(info)   ((info)->id[5])

 static const struct flash_info *spi_nor_match_id(const char *name);

@@ -881,6 +886,7 @@ static const struct flash_info spi_nor_ids[] = {
         */
        { "s25sl032p",  INFO(0x010215, 0x4d00,  64 * 1024,  64, SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
        { "s25sl064p",  INFO(0x010216, 0x4d00,  64 * 1024, 128, SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
+       { "s25fs256s1", INFO6(0x010219, 0x4d0181, 64 * 1024, 512, 0)},
        { "s25fl256s0", INFO(0x010219, 0x4d00, 256 * 1024, 128, 0) },
        { "s25fl256s1", INFO(0x010219, 0x4d01,  64 * 1024, 512, SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
        { "s25fl512s",  INFO(0x010220, 0x4d00, 256 * 1024, 256, SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
@@ -1018,6 +1024,53 @@ static const struct flash_info *spi_nor_read_id(struct spi_nor *nor)
        return ERR_PTR(-ENODEV);
 }

+/*
+ * The S25FS-S family physical sectors may be configured as a
+ * hybrid combination of eight 4-kB parameter sectors
+ * at the top or bottom of the address space with all
+ * but one of the remaining sectors being uniform size.
+ * The Parameter Sector Erase commands (20h or 21h) must
+ * be used to erase the 4-kB parameter sectors individually.
+ * The Sector (uniform sector) Erase commands (D8h or DCh)
+ * must be used to erase any of the remaining
+ * sectors, including the portion of highest or lowest address
+ * sector that is not overlaid by the parameter sectors.
+ * The uniform sector erase command has no effect on parameter sectors.
+ */
+static int spansion_s25fs_disable_4kb_erase(struct spi_nor *nor)
+{
+       struct fsl_qspi *q;
+       u32 cr3v_addr  = SPINOR_CONFIG_REG3_OFFSET;
+       u8 cr3v = 0x0;
+       int ret = 0x0;
+
+       q = nor->priv;
+
+       nor->cmd_buf[2] = cr3v_addr >> 16;
+       nor->cmd_buf[1] = cr3v_addr >> 8;
+       nor->cmd_buf[0] = cr3v_addr >> 0;

I feel it's hacking code.

Hi Brian, do we have any plan to support this special case? The RDAR(
Read Any Register) needs an extra address parameter.

+
+       ret = nor->read_reg(nor, SPINOR_OP_SPANSION_RDAR, &cr3v, 1);
+       if (ret)
+               return ret;
+       if (cr3v & CR3V_4KB_ERASE_UNABLE)
+               return 0;
+       ret = nor->write_reg(nor, SPINOR_OP_WREN, NULL, 0);
+       if (ret)
+               return ret;
+       cr3v = CR3V_4KB_ERASE_UNABLE;
+       nor->program_opcode = SPINOR_OP_SPANSION_WRAR;
+       nor->write(nor, cr3v_addr, 1, NULL, &cr3v);
+
+       ret = nor->read_reg(nor, SPINOR_OP_SPANSION_RDAR, &cr3v, 1);
+       if (ret)
+               return ret;
+       if (!(cr3v & CR3V_4KB_ERASE_UNABLE))
+               return -EPERM;
+
+       return 0;
+}
+
 static int spi_nor_read(struct mtd_info *mtd, loff_t from, size_t len,
                        size_t *retlen, u_char *buf)
 {
@@ -1311,6 +1364,12 @@ int spi_nor_scan(struct spi_nor *nor, const char *name, enum read_mode mode)
                spi_nor_wait_till_ready(nor);
        }

+       if (EXT_ID(info) == SPINOR_S25FS_FAMILY_ID) {
+               ret = spansion_s25fs_disable_4kb_erase(nor);
+               if (ret)
+                       return ret;
+       }
+
        if (!mtd->name)
                mtd->name = dev_name(dev);
        mtd->priv = nor;
--
2.1.0.27.g96db324

Re: [PATCH 8/9] mtd: fsl-quadspi: disable AHB buffer prefetch

[Han Xu]

________________________________________
From: Yunhui Cui <B56489@freescale.com>
Sent: Wednesday, April 13, 2016 9:50 PM
To: dwmw2@infradead.org; computersforpeace@gmail.com; han.xu@freescale.com
Cc: linux-kernel@vger.kernel.org; linux-mtd@lists.infradead.org; linux-arm-kernel@lists.infradead.org; Yao Yuan; Yunhui Cui
Subject: [PATCH 8/9] mtd: fsl-quadspi: disable AHB buffer prefetch

From: Yunhui Cui <yunhui.cui@nxp.com>

A-009282: QuadSPI: QuadSPI data pre-fetch can result in incorrect data
Affects: QuadSPI
Description: With AHB buffer prefetch enabled, the QuadSPI may return
incorrect data on the AHB
interface. The buffer pre-fetch is enabled if the fetch size as
configured either in the LUT or in
the BUFxCR register is greater than 8 bytes.
Impact: Only 64 bit read allowed.
Workaround: Keep the read data size to 64 bits (8 Bytes), which disables
the prefetch on the AHB buffer,
and prevents this issue from occurring.

Signed-off-by: Yunhui Cui <yunhui.cui@nxp.com>
---
 drivers/mtd/spi-nor/fsl-quadspi.c | 29 +++++++++++++++++++++++------
 1 file changed, 23 insertions(+), 6 deletions(-)

diff --git a/drivers/mtd/spi-nor/fsl-quadspi.c b/drivers/mtd/spi-nor/fsl-quadspi.c
index fea18b6..d9f3e50 100644
--- a/drivers/mtd/spi-nor/fsl-quadspi.c
+++ b/drivers/mtd/spi-nor/fsl-quadspi.c
@@ -752,19 +752,36 @@ static void fsl_qspi_init_abh_read(struct fsl_qspi *q)
 {
        void __iomem *base = q->iobase;
        int seqid;
+       const struct fsl_qspi_devtype_data *devtype_data = q->devtype_data;

        /* AHB configuration for access buffer 0/1/2 .*/
        qspi_writel(q, QUADSPI_BUFXCR_INVALID_MSTRID, base + QUADSPI_BUF0CR);
        qspi_writel(q, QUADSPI_BUFXCR_INVALID_MSTRID, base + QUADSPI_BUF1CR);
        qspi_writel(q, QUADSPI_BUFXCR_INVALID_MSTRID, base + QUADSPI_BUF2CR);
+
        /*
-        * Set ADATSZ with the maximum AHB buffer size to improve the
-        * read performance.
+        * Errata: A-009282: QuadSPI data prefetch may result in incorrect data
+        * Workaround: Keep the read data size to 64 bits (8 bytes).
+        * This disables the prefetch on the AHB buffer and
+        * prevents this issue from occurring.
         */
-       qspi_writel(q, QUADSPI_BUF3CR_ALLMST_MASK |
-                       ((q->devtype_data->ahb_buf_size / 8)
-                       << QUADSPI_BUF3CR_ADATSZ_SHIFT),
-                       base + QUADSPI_BUF3CR);
+       if (devtype_data->devtype == FSL_QUADSPI_LS2080A ||
+           devtype_data->devtype == FSL_QUADSPI_LS1021A) {

Use QUIRK, not SoC name.
+
+               qspi_writel(q, QUADSPI_BUF3CR_ALLMST_MASK |
+                               (1 << QUADSPI_BUF3CR_ADATSZ_SHIFT),
+                               base + QUADSPI_BUF3CR);
+
+       } else {
+               /*
+                * Set ADATSZ with the maximum AHB buffer size to improve the
+                * read performance.
+               */
+               qspi_writel(q, QUADSPI_BUF3CR_ALLMST_MASK |
+                               ((q->devtype_data->ahb_buf_size / 8)
+                               << QUADSPI_BUF3CR_ADATSZ_SHIFT),
+                               base + QUADSPI_BUF3CR);
+       }

        /* We only use the buffer3 */
        qspi_writel(q, 0, base + QUADSPI_BUF0IND);
--
2.1.0.27.g96db324

RE: [PATCH 8/9] mtd: fsl-quadspi: disable AHB buffer prefetch

[Yunhui Cui]

On Thu, Apr 24, 2016 at 06:37:01 AM +0800, Han Xu wrote:
> ________________________________________
> From: Yunhui Cui <B56489@freescale.com>
> Sent: Wednesday, April 13, 2016 9:50 PM
> To: dwmw2@infradead.org; computersforpeace@gmail.com;
> han.xu@freescale.com
> Cc: linux-kernel@vger.kernel.org; linux-mtd@lists.infradead.org; linux-
> arm-kernel@lists.infradead.org; Yao Yuan; Yunhui Cui
> Subject: [PATCH 8/9] mtd: fsl-quadspi: disable AHB buffer prefetch
> 
> From: Yunhui Cui <yunhui.cui@nxp.com>
> 
> A-009282: QuadSPI: QuadSPI data pre-fetch can result in incorrect data
> Affects: QuadSPI
> Description: With AHB buffer prefetch enabled, the QuadSPI may return
> incorrect data on the AHB interface. The buffer pre-fetch is enabled if
> the fetch size as configured either in the LUT or in the BUFxCR register
> is greater than 8 bytes.
> Impact: Only 64 bit read allowed.
> Workaround: Keep the read data size to 64 bits (8 Bytes), which disables
> the prefetch on the AHB buffer, and prevents this issue from occurring.
> 
> Signed-off-by: Yunhui Cui <yunhui.cui@nxp.com>
> ---
>  drivers/mtd/spi-nor/fsl-quadspi.c | 29 +++++++++++++++++++++++------
>  1 file changed, 23 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/mtd/spi-nor/fsl-quadspi.c b/drivers/mtd/spi-nor/fsl-
> quadspi.c
> index fea18b6..d9f3e50 100644
> --- a/drivers/mtd/spi-nor/fsl-quadspi.c
> +++ b/drivers/mtd/spi-nor/fsl-quadspi.c
> @@ -752,19 +752,36 @@ static void fsl_qspi_init_abh_read(struct fsl_qspi
> *q)  {
>         void __iomem *base = q->iobase;
>         int seqid;
> +       const struct fsl_qspi_devtype_data *devtype_data =
> + q->devtype_data;
> 
>         /* AHB configuration for access buffer 0/1/2 .*/
>         qspi_writel(q, QUADSPI_BUFXCR_INVALID_MSTRID, base +
> QUADSPI_BUF0CR);
>         qspi_writel(q, QUADSPI_BUFXCR_INVALID_MSTRID, base +
> QUADSPI_BUF1CR);
>         qspi_writel(q, QUADSPI_BUFXCR_INVALID_MSTRID, base +
> QUADSPI_BUF2CR);
> +
>         /*
> -        * Set ADATSZ with the maximum AHB buffer size to improve the
> -        * read performance.
> +        * Errata: A-009282: QuadSPI data prefetch may result in
> incorrect data
> +        * Workaround: Keep the read data size to 64 bits (8 bytes).
> +        * This disables the prefetch on the AHB buffer and
> +        * prevents this issue from occurring.
>          */
> -       qspi_writel(q, QUADSPI_BUF3CR_ALLMST_MASK |
> -                       ((q->devtype_data->ahb_buf_size / 8)
> -                       << QUADSPI_BUF3CR_ADATSZ_SHIFT),
> -                       base + QUADSPI_BUF3CR);
> +       if (devtype_data->devtype == FSL_QUADSPI_LS2080A ||
> +           devtype_data->devtype == FSL_QUADSPI_LS1021A) {
> 
> Use QUIRK, not SoC name.
[Yunhui] This is a SoC errata, we need distinguish according to the devtype_data->devtype
> +
> +               qspi_writel(q, QUADSPI_BUF3CR_ALLMST_MASK |
> +                               (1 << QUADSPI_BUF3CR_ADATSZ_SHIFT),
> +                               base + QUADSPI_BUF3CR);
> +
> +       } else {
> +               /*
> +                * Set ADATSZ with the maximum AHB buffer size to improve
> the
> +                * read performance.
> +               */
> +               qspi_writel(q, QUADSPI_BUF3CR_ALLMST_MASK |
> +                               ((q->devtype_data->ahb_buf_size / 8)
> +                               << QUADSPI_BUF3CR_ADATSZ_SHIFT),
> +                               base + QUADSPI_BUF3CR);
> +       }
> 
>         /* We only use the buffer3 */
>         qspi_writel(q, 0, base + QUADSPI_BUF0IND);
> --
> 2.1.0.27.g96db324

Re: [PATCH 8/9] mtd: fsl-quadspi: disable AHB buffer prefetch

[Han Xu]

________________________________________
From: Yunhui Cui
Sent: Thursday, April 21, 2016 3:41 AM
To: Han Xu; Yunhui Cui; dwmw2@infradead.org; computersforpeace@gmail.com; han.xu@freescale.com
Cc: linux-kernel@vger.kernel.org; linux-mtd@lists.infradead.org; linux-arm-kernel@lists.infradead.org; Yao Yuan
Subject: RE: [PATCH 8/9] mtd: fsl-quadspi: disable AHB buffer prefetch

On Thu, Apr 24, 2016 at 06:37:01 AM +0800, Han Xu wrote:
> ________________________________________
> From: Yunhui Cui <B56489@freescale.com>
> Sent: Wednesday, April 13, 2016 9:50 PM
> To: dwmw2@infradead.org; computersforpeace@gmail.com;
> han.xu@freescale.com
> Cc: linux-kernel@vger.kernel.org; linux-mtd@lists.infradead.org; linux-
> arm-kernel@lists.infradead.org; Yao Yuan; Yunhui Cui
> Subject: [PATCH 8/9] mtd: fsl-quadspi: disable AHB buffer prefetch
>
> From: Yunhui Cui <yunhui.cui@nxp.com>
>
> A-009282: QuadSPI: QuadSPI data pre-fetch can result in incorrect data
> Affects: QuadSPI
> Description: With AHB buffer prefetch enabled, the QuadSPI may return
> incorrect data on the AHB interface. The buffer pre-fetch is enabled if
> the fetch size as configured either in the LUT or in the BUFxCR register
> is greater than 8 bytes.
> Impact: Only 64 bit read allowed.
> Workaround: Keep the read data size to 64 bits (8 Bytes), which disables
> the prefetch on the AHB buffer, and prevents this issue from occurring.
>
> Signed-off-by: Yunhui Cui <yunhui.cui@nxp.com>
> ---
>  drivers/mtd/spi-nor/fsl-quadspi.c | 29 +++++++++++++++++++++++------
>  1 file changed, 23 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/mtd/spi-nor/fsl-quadspi.c b/drivers/mtd/spi-nor/fsl-
> quadspi.c
> index fea18b6..d9f3e50 100644
> --- a/drivers/mtd/spi-nor/fsl-quadspi.c
> +++ b/drivers/mtd/spi-nor/fsl-quadspi.c
> @@ -752,19 +752,36 @@ static void fsl_qspi_init_abh_read(struct fsl_qspi
> *q)  {
>         void __iomem *base = q->iobase;
>         int seqid;
> +       const struct fsl_qspi_devtype_data *devtype_data =
> + q->devtype_data;
>
>         /* AHB configuration for access buffer 0/1/2 .*/
>         qspi_writel(q, QUADSPI_BUFXCR_INVALID_MSTRID, base +
> QUADSPI_BUF0CR);
>         qspi_writel(q, QUADSPI_BUFXCR_INVALID_MSTRID, base +
> QUADSPI_BUF1CR);
>         qspi_writel(q, QUADSPI_BUFXCR_INVALID_MSTRID, base +
> QUADSPI_BUF2CR);
> +
>         /*
> -        * Set ADATSZ with the maximum AHB buffer size to improve the
> -        * read performance.
> +        * Errata: A-009282: QuadSPI data prefetch may result in
> incorrect data
> +        * Workaround: Keep the read data size to 64 bits (8 bytes).
> +        * This disables the prefetch on the AHB buffer and
> +        * prevents this issue from occurring.
>          */
> -       qspi_writel(q, QUADSPI_BUF3CR_ALLMST_MASK |
> -                       ((q->devtype_data->ahb_buf_size / 8)
> -                       << QUADSPI_BUF3CR_ADATSZ_SHIFT),
> -                       base + QUADSPI_BUF3CR);
> +       if (devtype_data->devtype == FSL_QUADSPI_LS2080A ||
> +           devtype_data->devtype == FSL_QUADSPI_LS1021A) {
>
> Use QUIRK, not SoC name.
[Yunhui] This is a SoC errata, we need distinguish according to the devtype_data->devtype

It's the same thing and we have already done that before.

/*
 * TKT253890, Controller needs driver to fill txfifo till 16 byte to
 * trigger data transfer even though extra data will not transferred.
 */
#define QUADSPI_QUIRK_TKT253890         (1 << 2)
/* Controller cannot wake up from wait mode, TKT245618 */
#define QUADSPI_QUIRK_TKT245618         (1 << 3)


> +
> +               qspi_writel(q, QUADSPI_BUF3CR_ALLMST_MASK |
> +                               (1 << QUADSPI_BUF3CR_ADATSZ_SHIFT),
> +                               base + QUADSPI_BUF3CR);
> +
> +       } else {
> +               /*
> +                * Set ADATSZ with the maximum AHB buffer size to improve
> the
> +                * read performance.
> +               */
> +               qspi_writel(q, QUADSPI_BUF3CR_ALLMST_MASK |
> +                               ((q->devtype_data->ahb_buf_size / 8)
> +                               << QUADSPI_BUF3CR_ADATSZ_SHIFT),
> +                               base + QUADSPI_BUF3CR);
> +       }
>
>         /* We only use the buffer3 */
>         qspi_writel(q, 0, base + QUADSPI_BUF0IND);
> --
> 2.1.0.27.g96db324

RE: [PATCH 8/9] mtd: fsl-quadspi: disable AHB buffer prefetch

[Yunhui Cui]

> -----Original Message-----
> From: Han Xu
> Sent: Thursday, April 21, 2016 11:48 PM
> To: Yunhui Cui; Yunhui Cui; dwmw2@infradead.org;
> computersforpeace@gmail.com; han.xu@freescale.com
> Cc: linux-kernel@vger.kernel.org; linux-mtd@lists.infradead.org; linux-
> arm-kernel@lists.infradead.org; Yao Yuan
> Subject: Re: [PATCH 8/9] mtd: fsl-quadspi: disable AHB buffer prefetch
> 
> 
> 
> ________________________________________
> From: Yunhui Cui
> Sent: Thursday, April 21, 2016 3:41 AM
> To: Han Xu; Yunhui Cui; dwmw2@infradead.org; computersforpeace@gmail.com;
> han.xu@freescale.com
> Cc: linux-kernel@vger.kernel.org; linux-mtd@lists.infradead.org; linux-
> arm-kernel@lists.infradead.org; Yao Yuan
> Subject: RE: [PATCH 8/9] mtd: fsl-quadspi: disable AHB buffer prefetch
> 
> On Thu, Apr 24, 2016 at 06:37:01 AM +0800, Han Xu wrote:
> > ________________________________________
> > From: Yunhui Cui <B56489@freescale.com>
> > Sent: Wednesday, April 13, 2016 9:50 PM
> > To: dwmw2@infradead.org; computersforpeace@gmail.com;
> > han.xu@freescale.com
> > Cc: linux-kernel@vger.kernel.org; linux-mtd@lists.infradead.org;
> > linux- arm-kernel@lists.infradead.org; Yao Yuan; Yunhui Cui
> > Subject: [PATCH 8/9] mtd: fsl-quadspi: disable AHB buffer prefetch
> >
> > From: Yunhui Cui <yunhui.cui@nxp.com>
> >
> > A-009282: QuadSPI: QuadSPI data pre-fetch can result in incorrect data
> > Affects: QuadSPI
> > Description: With AHB buffer prefetch enabled, the QuadSPI may return
> > incorrect data on the AHB interface. The buffer pre-fetch is enabled
> > if the fetch size as configured either in the LUT or in the BUFxCR
> > register is greater than 8 bytes.
> > Impact: Only 64 bit read allowed.
> > Workaround: Keep the read data size to 64 bits (8 Bytes), which
> > disables the prefetch on the AHB buffer, and prevents this issue from
> occurring.
> >
> > Signed-off-by: Yunhui Cui <yunhui.cui@nxp.com>
> > ---
> >  drivers/mtd/spi-nor/fsl-quadspi.c | 29 +++++++++++++++++++++++------
> >  1 file changed, 23 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/mtd/spi-nor/fsl-quadspi.c
> > b/drivers/mtd/spi-nor/fsl- quadspi.c index fea18b6..d9f3e50 100644
> > --- a/drivers/mtd/spi-nor/fsl-quadspi.c
> > +++ b/drivers/mtd/spi-nor/fsl-quadspi.c
> > @@ -752,19 +752,36 @@ static void fsl_qspi_init_abh_read(struct
> > fsl_qspi
> > *q)  {
> >         void __iomem *base = q->iobase;
> >         int seqid;
> > +       const struct fsl_qspi_devtype_data *devtype_data =
> > + q->devtype_data;
> >
> >         /* AHB configuration for access buffer 0/1/2 .*/
> >         qspi_writel(q, QUADSPI_BUFXCR_INVALID_MSTRID, base +
> > QUADSPI_BUF0CR);
> >         qspi_writel(q, QUADSPI_BUFXCR_INVALID_MSTRID, base +
> > QUADSPI_BUF1CR);
> >         qspi_writel(q, QUADSPI_BUFXCR_INVALID_MSTRID, base +
> > QUADSPI_BUF2CR);
> > +
> >         /*
> > -        * Set ADATSZ with the maximum AHB buffer size to improve the
> > -        * read performance.
> > +        * Errata: A-009282: QuadSPI data prefetch may result in
> > incorrect data
> > +        * Workaround: Keep the read data size to 64 bits (8 bytes).
> > +        * This disables the prefetch on the AHB buffer and
> > +        * prevents this issue from occurring.
> >          */
> > -       qspi_writel(q, QUADSPI_BUF3CR_ALLMST_MASK |
> > -                       ((q->devtype_data->ahb_buf_size / 8)
> > -                       << QUADSPI_BUF3CR_ADATSZ_SHIFT),
> > -                       base + QUADSPI_BUF3CR);
> > +       if (devtype_data->devtype == FSL_QUADSPI_LS2080A ||
> > +           devtype_data->devtype == FSL_QUADSPI_LS1021A) {
> >
> > Use QUIRK, not SoC name.
> [Yunhui] This is a SoC errata, we need distinguish according to the
> devtype_data->devtype
> 
> It's the same thing and we have already done that before.

> [Yunhui] your mean that I should add such as the following code:
	#define QUADSPI_QUIRK_ERRATA_9282         (1 << 4)
	static inline int has_errata_num_a009282(struct fsl_qspi *q)
	{
        	 return q->devtype_data->driver_data & QUADSPI_QUIRK_ERRATA_9282;
	}

> /*
>  * TKT253890, Controller needs driver to fill txfifo till 16 byte to
>  * trigger data transfer even though extra data will not transferred.
>  */
> #define QUADSPI_QUIRK_TKT253890         (1 << 2)
> /* Controller cannot wake up from wait mode, TKT245618 */
> #define QUADSPI_QUIRK_TKT245618         (1 << 3)
> 
> 
> > +
> > +               qspi_writel(q, QUADSPI_BUF3CR_ALLMST_MASK |
> > +                               (1 << QUADSPI_BUF3CR_ADATSZ_SHIFT),
> > +                               base + QUADSPI_BUF3CR);
> > +
> > +       } else {
> > +               /*
> > +                * Set ADATSZ with the maximum AHB buffer size to
> > + improve
> > the
> > +                * read performance.
> > +               */
> > +               qspi_writel(q, QUADSPI_BUF3CR_ALLMST_MASK |
> > +                               ((q->devtype_data->ahb_buf_size / 8)
> > +                               << QUADSPI_BUF3CR_ADATSZ_SHIFT),
> > +                               base + QUADSPI_BUF3CR);
> > +       }
> >
> >         /* We only use the buffer3 */
> >         qspi_writel(q, 0, base + QUADSPI_BUF0IND);
> > --
> > 2.1.0.27.g96db324

Re: [PATCH 8/9] mtd: fsl-quadspi: disable AHB buffer prefetch

[Han Xu]

________________________________________
From: Yunhui Cui
Sent: Thursday, April 21, 2016 9:52 PM
To: Han Xu; Yunhui Cui; dwmw2@infradead.org; computersforpeace@gmail.com; han.xu@freescale.com
Cc: linux-kernel@vger.kernel.org; linux-mtd@lists.infradead.org; linux-arm-kernel@lists.infradead.org; Yao Yuan
Subject: RE: [PATCH 8/9] mtd: fsl-quadspi: disable AHB buffer prefetch

> -----Original Message-----
> From: Han Xu
> Sent: Thursday, April 21, 2016 11:48 PM
> To: Yunhui Cui; Yunhui Cui; dwmw2@infradead.org;
> computersforpeace@gmail.com; han.xu@freescale.com
> Cc: linux-kernel@vger.kernel.org; linux-mtd@lists.infradead.org; linux-
> arm-kernel@lists.infradead.org; Yao Yuan
> Subject: Re: [PATCH 8/9] mtd: fsl-quadspi: disable AHB buffer prefetch
>
>
>
> ________________________________________
> From: Yunhui Cui
> Sent: Thursday, April 21, 2016 3:41 AM
> To: Han Xu; Yunhui Cui; dwmw2@infradead.org; computersforpeace@gmail.com;
> han.xu@freescale.com
> Cc: linux-kernel@vger.kernel.org; linux-mtd@lists.infradead.org; linux-
> arm-kernel@lists.infradead.org; Yao Yuan
> Subject: RE: [PATCH 8/9] mtd: fsl-quadspi: disable AHB buffer prefetch
>
> On Thu, Apr 24, 2016 at 06:37:01 AM +0800, Han Xu wrote:
> > ________________________________________
> > From: Yunhui Cui <B56489@freescale.com>
> > Sent: Wednesday, April 13, 2016 9:50 PM
> > To: dwmw2@infradead.org; computersforpeace@gmail.com;
> > han.xu@freescale.com
> > Cc: linux-kernel@vger.kernel.org; linux-mtd@lists.infradead.org;
> > linux- arm-kernel@lists.infradead.org; Yao Yuan; Yunhui Cui
> > Subject: [PATCH 8/9] mtd: fsl-quadspi: disable AHB buffer prefetch
> >
> > From: Yunhui Cui <yunhui.cui@nxp.com>
> >
> > A-009282: QuadSPI: QuadSPI data pre-fetch can result in incorrect data
> > Affects: QuadSPI
> > Description: With AHB buffer prefetch enabled, the QuadSPI may return
> > incorrect data on the AHB interface. The buffer pre-fetch is enabled
> > if the fetch size as configured either in the LUT or in the BUFxCR
> > register is greater than 8 bytes.
> > Impact: Only 64 bit read allowed.
> > Workaround: Keep the read data size to 64 bits (8 Bytes), which
> > disables the prefetch on the AHB buffer, and prevents this issue from
> occurring.
> >
> > Signed-off-by: Yunhui Cui <yunhui.cui@nxp.com>
> > ---
> >  drivers/mtd/spi-nor/fsl-quadspi.c | 29 +++++++++++++++++++++++------
> >  1 file changed, 23 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/mtd/spi-nor/fsl-quadspi.c
> > b/drivers/mtd/spi-nor/fsl- quadspi.c index fea18b6..d9f3e50 100644
> > --- a/drivers/mtd/spi-nor/fsl-quadspi.c
> > +++ b/drivers/mtd/spi-nor/fsl-quadspi.c
> > @@ -752,19 +752,36 @@ static void fsl_qspi_init_abh_read(struct
> > fsl_qspi
> > *q)  {
> >         void __iomem *base = q->iobase;
> >         int seqid;
> > +       const struct fsl_qspi_devtype_data *devtype_data =
> > + q->devtype_data;
> >
> >         /* AHB configuration for access buffer 0/1/2 .*/
> >         qspi_writel(q, QUADSPI_BUFXCR_INVALID_MSTRID, base +
> > QUADSPI_BUF0CR);
> >         qspi_writel(q, QUADSPI_BUFXCR_INVALID_MSTRID, base +
> > QUADSPI_BUF1CR);
> >         qspi_writel(q, QUADSPI_BUFXCR_INVALID_MSTRID, base +
> > QUADSPI_BUF2CR);
> > +
> >         /*
> > -        * Set ADATSZ with the maximum AHB buffer size to improve the
> > -        * read performance.
> > +        * Errata: A-009282: QuadSPI data prefetch may result in
> > incorrect data
> > +        * Workaround: Keep the read data size to 64 bits (8 bytes).
> > +        * This disables the prefetch on the AHB buffer and
> > +        * prevents this issue from occurring.
> >          */
> > -       qspi_writel(q, QUADSPI_BUF3CR_ALLMST_MASK |
> > -                       ((q->devtype_data->ahb_buf_size / 8)
> > -                       << QUADSPI_BUF3CR_ADATSZ_SHIFT),
> > -                       base + QUADSPI_BUF3CR);
> > +       if (devtype_data->devtype == FSL_QUADSPI_LS2080A ||
> > +           devtype_data->devtype == FSL_QUADSPI_LS1021A) {
> >
> > Use QUIRK, not SoC name.
> [Yunhui] This is a SoC errata, we need distinguish according to the
> devtype_data->devtype
>
> It's the same thing and we have already done that before.

> [Yunhui] your mean that I should add such as the following code:
        #define QUADSPI_QUIRK_ERRATA_9282         (1 << 4)
        static inline int has_errata_num_a009282(struct fsl_qspi *q)
        {
                 return q->devtype_data->driver_data & QUADSPI_QUIRK_ERRATA_9282;
        }

I mean QUIRK can be used even for HW limitation, but it's not necessary to
use ERRATA number as QUIRK name, you can name it with natural language,
such as QUADSPI_QUIRK_ADASZ_8BYTE_LIMIT, and describe the reason in
comments.

> /*
>  * TKT253890, Controller needs driver to fill txfifo till 16 byte to
>  * trigger data transfer even though extra data will not transferred.
>  */
> #define QUADSPI_QUIRK_TKT253890         (1 << 2)
> /* Controller cannot wake up from wait mode, TKT245618 */
> #define QUADSPI_QUIRK_TKT245618         (1 << 3)
>
>
> > +
> > +               qspi_writel(q, QUADSPI_BUF3CR_ALLMST_MASK |
> > +                               (1 << QUADSPI_BUF3CR_ADATSZ_SHIFT),
> > +                               base + QUADSPI_BUF3CR);
> > +
> > +       } else {
> > +               /*
> > +                * Set ADATSZ with the maximum AHB buffer size to
> > + improve
> > the
> > +                * read performance.
> > +               */
> > +               qspi_writel(q, QUADSPI_BUF3CR_ALLMST_MASK |
> > +                               ((q->devtype_data->ahb_buf_size / 8)
> > +                               << QUADSPI_BUF3CR_ADATSZ_SHIFT),
> > +                               base + QUADSPI_BUF3CR);
> > +       }
> >
> >         /* We only use the buffer3 */
> >         qspi_writel(q, 0, base + QUADSPI_BUF0IND);
> > --
> > 2.1.0.27.g96db324

RE: [PATCH 8/9] mtd: fsl-quadspi: disable AHB buffer prefetch

[Yunhui Cui]

> -----Original Message-----
> From: Han Xu
> Sent: Friday, April 22, 2016 12:49 PM
> To: Yunhui Cui; Yunhui Cui; dwmw2@infradead.org;
> computersforpeace@gmail.com; han.xu@freescale.com
> Cc: linux-kernel@vger.kernel.org; linux-mtd@lists.infradead.org; linux-
> arm-kernel@lists.infradead.org; Yao Yuan
> Subject: Re: [PATCH 8/9] mtd: fsl-quadspi: disable AHB buffer prefetch
> 
> 
> 
> ________________________________________
> From: Yunhui Cui
> Sent: Thursday, April 21, 2016 9:52 PM
> To: Han Xu; Yunhui Cui; dwmw2@infradead.org; computersforpeace@gmail.com;
> han.xu@freescale.com
> Cc: linux-kernel@vger.kernel.org; linux-mtd@lists.infradead.org; linux-
> arm-kernel@lists.infradead.org; Yao Yuan
> Subject: RE: [PATCH 8/9] mtd: fsl-quadspi: disable AHB buffer prefetch
> 
> > -----Original Message-----
> > From: Han Xu
> > Sent: Thursday, April 21, 2016 11:48 PM
> > To: Yunhui Cui; Yunhui Cui; dwmw2@infradead.org;
> > computersforpeace@gmail.com; han.xu@freescale.com
> > Cc: linux-kernel@vger.kernel.org; linux-mtd@lists.infradead.org;
> > linux- arm-kernel@lists.infradead.org; Yao Yuan
> > Subject: Re: [PATCH 8/9] mtd: fsl-quadspi: disable AHB buffer prefetch
> >
> >
> >
> > ________________________________________
> > From: Yunhui Cui
> > Sent: Thursday, April 21, 2016 3:41 AM
> > To: Han Xu; Yunhui Cui; dwmw2@infradead.org;
> > computersforpeace@gmail.com; han.xu@freescale.com
> > Cc: linux-kernel@vger.kernel.org; linux-mtd@lists.infradead.org;
> > linux- arm-kernel@lists.infradead.org; Yao Yuan
> > Subject: RE: [PATCH 8/9] mtd: fsl-quadspi: disable AHB buffer prefetch
> >
> > On Thu, Apr 24, 2016 at 06:37:01 AM +0800, Han Xu wrote:
> > > ________________________________________
> > > From: Yunhui Cui <B56489@freescale.com>
> > > Sent: Wednesday, April 13, 2016 9:50 PM
> > > To: dwmw2@infradead.org; computersforpeace@gmail.com;
> > > han.xu@freescale.com
> > > Cc: linux-kernel@vger.kernel.org; linux-mtd@lists.infradead.org;
> > > linux- arm-kernel@lists.infradead.org; Yao Yuan; Yunhui Cui
> > > Subject: [PATCH 8/9] mtd: fsl-quadspi: disable AHB buffer prefetch
> > >
> > > From: Yunhui Cui <yunhui.cui@nxp.com>
> > >
> > > A-009282: QuadSPI: QuadSPI data pre-fetch can result in incorrect
> > > data
> > > Affects: QuadSPI
> > > Description: With AHB buffer prefetch enabled, the QuadSPI may
> > > return incorrect data on the AHB interface. The buffer pre-fetch is
> > > enabled if the fetch size as configured either in the LUT or in the
> > > BUFxCR register is greater than 8 bytes.
> > > Impact: Only 64 bit read allowed.
> > > Workaround: Keep the read data size to 64 bits (8 Bytes), which
> > > disables the prefetch on the AHB buffer, and prevents this issue
> > > from
> > occurring.
> > >
> > > Signed-off-by: Yunhui Cui <yunhui.cui@nxp.com>
> > > ---
> > >  drivers/mtd/spi-nor/fsl-quadspi.c | 29
> > > +++++++++++++++++++++++------
> > >  1 file changed, 23 insertions(+), 6 deletions(-)
> > >
> > > diff --git a/drivers/mtd/spi-nor/fsl-quadspi.c
> > > b/drivers/mtd/spi-nor/fsl- quadspi.c index fea18b6..d9f3e50 100644
> > > --- a/drivers/mtd/spi-nor/fsl-quadspi.c
> > > +++ b/drivers/mtd/spi-nor/fsl-quadspi.c
> > > @@ -752,19 +752,36 @@ static void fsl_qspi_init_abh_read(struct
> > > fsl_qspi
> > > *q)  {
> > >         void __iomem *base = q->iobase;
> > >         int seqid;
> > > +       const struct fsl_qspi_devtype_data *devtype_data =
> > > + q->devtype_data;
> > >
> > >         /* AHB configuration for access buffer 0/1/2 .*/
> > >         qspi_writel(q, QUADSPI_BUFXCR_INVALID_MSTRID, base +
> > > QUADSPI_BUF0CR);
> > >         qspi_writel(q, QUADSPI_BUFXCR_INVALID_MSTRID, base +
> > > QUADSPI_BUF1CR);
> > >         qspi_writel(q, QUADSPI_BUFXCR_INVALID_MSTRID, base +
> > > QUADSPI_BUF2CR);
> > > +
> > >         /*
> > > -        * Set ADATSZ with the maximum AHB buffer size to improve the
> > > -        * read performance.
> > > +        * Errata: A-009282: QuadSPI data prefetch may result in
> > > incorrect data
> > > +        * Workaround: Keep the read data size to 64 bits (8 bytes).
> > > +        * This disables the prefetch on the AHB buffer and
> > > +        * prevents this issue from occurring.
> > >          */
> > > -       qspi_writel(q, QUADSPI_BUF3CR_ALLMST_MASK |
> > > -                       ((q->devtype_data->ahb_buf_size / 8)
> > > -                       << QUADSPI_BUF3CR_ADATSZ_SHIFT),
> > > -                       base + QUADSPI_BUF3CR);
> > > +       if (devtype_data->devtype == FSL_QUADSPI_LS2080A ||
> > > +           devtype_data->devtype == FSL_QUADSPI_LS1021A) {
> > >
> > > Use QUIRK, not SoC name.
> > [Yunhui] This is a SoC errata, we need distinguish according to the
> > devtype_data->devtype
> >
> > It's the same thing and we have already done that before.
> 
> > [Yunhui] your mean that I should add such as the following code:
>         #define QUADSPI_QUIRK_ERRATA_9282         (1 << 4)
>         static inline int has_errata_num_a009282(struct fsl_qspi *q)
>         {
>                  return q->devtype_data->driver_data &
> QUADSPI_QUIRK_ERRATA_9282;
>         }
> 
> I mean QUIRK can be used even for HW limitation, but it's not necessary
> to use ERRATA number as QUIRK name, you can name it with natural language,
> such as QUADSPI_QUIRK_ADASZ_8BYTE_LIMIT, and describe the reason in
> comments.
> [Yunhui] thanks, I will update it in v2.
> > /*
> >  * TKT253890, Controller needs driver to fill txfifo till 16 byte to
> >  * trigger data transfer even though extra data will not transferred.
> >  */
> > #define QUADSPI_QUIRK_TKT253890         (1 << 2)
> > /* Controller cannot wake up from wait mode, TKT245618 */
> > #define QUADSPI_QUIRK_TKT245618         (1 << 3)
> >
> >
> > > +
> > > +               qspi_writel(q, QUADSPI_BUF3CR_ALLMST_MASK |
> > > +                               (1 << QUADSPI_BUF3CR_ADATSZ_SHIFT),
> > > +                               base + QUADSPI_BUF3CR);
> > > +
> > > +       } else {
> > > +               /*
> > > +                * Set ADATSZ with the maximum AHB buffer size to
> > > + improve
> > > the
> > > +                * read performance.
> > > +               */
> > > +               qspi_writel(q, QUADSPI_BUF3CR_ALLMST_MASK |
> > > +                               ((q->devtype_data->ahb_buf_size / 8)
> > > +                               << QUADSPI_BUF3CR_ADATSZ_SHIFT),
> > > +                               base + QUADSPI_BUF3CR);
> > > +       }
> > >
> > >         /* We only use the buffer3 */
> > >         qspi_writel(q, 0, base + QUADSPI_BUF0IND);
> > > --
> > > 2.1.0.27.g96db324

Re: [PATCH 6/9] mtd: spi-nor: Support R/W for S25FS-S family flash

[Han Xu]

On Wed, Apr 20, 2016 at 5:34 PM, Han Xu <han.xu@nxp.com> wrote:
>
>
> ________________________________________
> From: Yunhui Cui <B56489@freescale.com>
> Sent: Wednesday, April 13, 2016 9:50 PM
> To: dwmw2@infradead.org; computersforpeace@gmail.com; han.xu@freescale.com
> Cc: linux-kernel@vger.kernel.org; linux-mtd@lists.infradead.org; linux-arm-kernel@lists.infradead.org; Yao Yuan; Yunhui Cui
> Subject: [PATCH 6/9] mtd: spi-nor: Support R/W for S25FS-S family flash
>
> From: Yunhui Cui <yunhui.cui@nxp.com>
>
> With the physical sectors combination, S25FS-S family flash
> requires some special operations for read/write functions.
>
> Signed-off-by: Yunhui Cui <yunhui.cui@nxp.com>
> ---
>  drivers/mtd/spi-nor/spi-nor.c | 59 +++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 59 insertions(+)
>
> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
> index 157841d..91ee920 100644
> --- a/drivers/mtd/spi-nor/spi-nor.c
> +++ b/drivers/mtd/spi-nor/spi-nor.c
> @@ -39,6 +39,10 @@
>
>  #define SPI_NOR_MAX_ID_LEN     6
>  #define SPI_NOR_MAX_ADDR_WIDTH 4
> +/* Added for S25FS-S family flash */
> +#define SPINOR_CONFIG_REG3_OFFSET      0x800004
> +#define CR3V_4KB_ERASE_UNABLE  0x8
> +#define SPINOR_S25FS_FAMILY_ID 0x81
>
>  struct flash_info {
>         char            *name;
> @@ -78,6 +82,7 @@ struct flash_info {
>  };
>
>  #define JEDEC_MFR(info)        ((info)->id[0])
> +#define EXT_ID(info)   ((info)->id[5])
>
>  static const struct flash_info *spi_nor_match_id(const char *name);
>
> @@ -881,6 +886,7 @@ static const struct flash_info spi_nor_ids[] = {
>          */
>         { "s25sl032p",  INFO(0x010215, 0x4d00,  64 * 1024,  64, SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
>         { "s25sl064p",  INFO(0x010216, 0x4d00,  64 * 1024, 128, SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
> +       { "s25fs256s1", INFO6(0x010219, 0x4d0181, 64 * 1024, 512, 0)},
>         { "s25fl256s0", INFO(0x010219, 0x4d00, 256 * 1024, 128, 0) },
>         { "s25fl256s1", INFO(0x010219, 0x4d01,  64 * 1024, 512, SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
>         { "s25fl512s",  INFO(0x010220, 0x4d00, 256 * 1024, 256, SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
> @@ -1018,6 +1024,53 @@ static const struct flash_info *spi_nor_read_id(struct spi_nor *nor)
>         return ERR_PTR(-ENODEV);
>  }
>
> +/*
> + * The S25FS-S family physical sectors may be configured as a
> + * hybrid combination of eight 4-kB parameter sectors
> + * at the top or bottom of the address space with all
> + * but one of the remaining sectors being uniform size.
> + * The Parameter Sector Erase commands (20h or 21h) must
> + * be used to erase the 4-kB parameter sectors individually.
> + * The Sector (uniform sector) Erase commands (D8h or DCh)
> + * must be used to erase any of the remaining
> + * sectors, including the portion of highest or lowest address
> + * sector that is not overlaid by the parameter sectors.
> + * The uniform sector erase command has no effect on parameter sectors.
> + */
> +static int spansion_s25fs_disable_4kb_erase(struct spi_nor *nor)
> +{
> +       struct fsl_qspi *q;
> +       u32 cr3v_addr  = SPINOR_CONFIG_REG3_OFFSET;
> +       u8 cr3v = 0x0;
> +       int ret = 0x0;
> +
> +       q = nor->priv;
> +
> +       nor->cmd_buf[2] = cr3v_addr >> 16;
> +       nor->cmd_buf[1] = cr3v_addr >> 8;
> +       nor->cmd_buf[0] = cr3v_addr >> 0;
>
> I feel it's hacking code.
>
> Hi Brian, do we have any plan to support this special case? The RDAR(
> Read Any Register) needs an extra address parameter.

Hi Brian,

I was wondering if you have some free time to check the questions. Thanks.
>
> +
> +       ret = nor->read_reg(nor, SPINOR_OP_SPANSION_RDAR, &cr3v, 1);
> +       if (ret)
> +               return ret;
> +       if (cr3v & CR3V_4KB_ERASE_UNABLE)
> +               return 0;
> +       ret = nor->write_reg(nor, SPINOR_OP_WREN, NULL, 0);
> +       if (ret)
> +               return ret;
> +       cr3v = CR3V_4KB_ERASE_UNABLE;
> +       nor->program_opcode = SPINOR_OP_SPANSION_WRAR;
> +       nor->write(nor, cr3v_addr, 1, NULL, &cr3v);
> +
> +       ret = nor->read_reg(nor, SPINOR_OP_SPANSION_RDAR, &cr3v, 1);
> +       if (ret)
> +               return ret;
> +       if (!(cr3v & CR3V_4KB_ERASE_UNABLE))
> +               return -EPERM;
> +
> +       return 0;
> +}
> +
>  static int spi_nor_read(struct mtd_info *mtd, loff_t from, size_t len,
>                         size_t *retlen, u_char *buf)
>  {
> @@ -1311,6 +1364,12 @@ int spi_nor_scan(struct spi_nor *nor, const char *name, enum read_mode mode)
>                 spi_nor_wait_till_ready(nor);
>         }
>
> +       if (EXT_ID(info) == SPINOR_S25FS_FAMILY_ID) {
> +               ret = spansion_s25fs_disable_4kb_erase(nor);
> +               if (ret)
> +                       return ret;
> +       }
> +
>         if (!mtd->name)
>                 mtd->name = dev_name(dev);
>         mtd->priv = nor;
> --
> 2.1.0.27.g96db324
>
>
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