[PATCH 0/6] Backport support for "extended device ID" for dataflash

[PATCH 0/6] Backport support for "extended device ID" for dataflash

[Andrey Smirnov]

Hi everyone,

This series is a backport of almost identical patchset that I did for
linux kernel:

      1. lkml.kernel.org/r/20170421163026.24884-1-andrew.smirnov@gmail.com
      2. lkml.kernel.org/r/20170421163026.24884-2-andrew.smirnov@gmail.com
      3. lkml.kernel.org/r/20170421163026.24884-3-andrew.smirnov@gmail.com
      4. lkml.kernel.org/r/20170421163026.24884-4-andrew.smirnov@gmail.com
      5. lkml.kernel.org/r/20170421163026.24884-5-andrew.smirnov@gmail.com
      6. lkml.kernel.org/r/20170421163026.24884-6-andrew.smirnov@gmail.com

The patchset hasn't hit Linus' tree yet, but it can be found in
linux-next:
	https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/log/drivers/mtd/devices/mtd_dataflash.c

Let me know if anything needs changing.

Thanks,
Andrey Smirnov

Andrey Smirnov (6):
  mtd: dataflash: Replace C99 types with their kernel counterparts
  mtd: dataflash: Improve coding style in jedec_probe()
  mtd: dataflash: Replace pr_debug, printk with dev_* functions
  mtd: dataflash: Get rid of loop counter in jedec_probe()
  mtd: dataflash: Make use of "extened device information"
  mtd: dataflash: Add flash_info for AT45DB641E

 drivers/mtd/devices/mtd_dataflash.c | 202 ++++++++++++++++++++----------------
 1 file changed, 113 insertions(+), 89 deletions(-)

-- 
2.9.4


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[PATCH 1/6] mtd: dataflash: Replace C99 types with their kernel counterparts

[Andrey Smirnov]

No functional change intended.

This is a backport of kernel commit
c41e43c6faf68a9b70afdb0dfee45d196c27031b

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
---
 drivers/mtd/devices/mtd_dataflash.c | 40 ++++++++++++++++++-------------------
 1 file changed, 20 insertions(+), 20 deletions(-)

diff --git a/drivers/mtd/devices/mtd_dataflash.c b/drivers/mtd/devices/mtd_dataflash.c
index fa31b61..cdbb194 100644
--- a/drivers/mtd/devices/mtd_dataflash.c
+++ b/drivers/mtd/devices/mtd_dataflash.c
@@ -85,7 +85,7 @@
 
 
 struct dataflash {
-	uint8_t			command[4];
+	u8			command[4];
 	char			name[24];
 
 	unsigned		partitioned:1;
@@ -146,8 +146,8 @@ static int dataflash_erase(struct mtd_info *mtd, struct erase_info *instr)
 	struct spi_transfer	x;
 	struct spi_message	msg;
 	unsigned		blocksize = priv->page_size << 3;
-	uint8_t			*command;
-	uint32_t		rem;
+	u8			*command;
+	u32			rem;
 
 	pr_debug("%s: erase addr=0x%llx len 0x%llx\n",
 	      dev_name(&spi->dev), (long long)instr->addr,
@@ -181,8 +181,8 @@ static int dataflash_erase(struct mtd_info *mtd, struct erase_info *instr)
 		pageaddr = pageaddr << priv->page_offset;
 
 		command[0] = do_block ? OP_ERASE_BLOCK : OP_ERASE_PAGE;
-		command[1] = (uint8_t)(pageaddr >> 16);
-		command[2] = (uint8_t)(pageaddr >> 8);
+		command[1] = (u8)(pageaddr >> 16);
+		command[2] = (u8)(pageaddr >> 8);
 		command[3] = 0;
 
 		pr_debug("ERASE %s: (%x) %x %x %x [%i]\n",
@@ -232,7 +232,7 @@ static int dataflash_read(struct mtd_info *mtd, loff_t from, size_t len,
 	struct spi_transfer	x[2];
 	struct spi_message	msg;
 	unsigned int		addr;
-	uint8_t			*command;
+	u8			*command;
 	int			status;
 
 	pr_debug("%s: read 0x%x..0x%x\n", dev_name(&priv->spi->dev),
@@ -264,9 +264,9 @@ static int dataflash_read(struct mtd_info *mtd, loff_t from, size_t len,
 	 * fewer "don't care" bytes.  Both buffers stay unchanged.
 	 */
 	command[0] = OP_READ_CONTINUOUS;
-	command[1] = (uint8_t)(addr >> 16);
-	command[2] = (uint8_t)(addr >> 8);
-	command[3] = (uint8_t)(addr >> 0);
+	command[1] = (u8)(addr >> 16);
+	command[2] = (u8)(addr >> 8);
+	command[3] = (u8)(addr >> 0);
 	/* plus 4 "don't care" bytes */
 
 	status = spi_sync(priv->spi, &msg);
@@ -300,7 +300,7 @@ static int dataflash_write(struct mtd_info *mtd, loff_t to, size_t len,
 	size_t			remaining = len;
 	u_char			*writebuf = (u_char *) buf;
 	int			status = -EINVAL;
-	uint8_t			*command;
+	u8			*command;
 
 	pr_debug("%s: write 0x%x..0x%x\n",
 		dev_name(&spi->dev), (unsigned)to, (unsigned)(to + len));
@@ -446,11 +446,11 @@ static int dataflash_get_otp_info(struct mtd_info *mtd,
 }
 
 static ssize_t otp_read(struct spi_device *spi, unsigned base,
-		uint8_t *buf, loff_t off, size_t len)
+		u8 *buf, loff_t off, size_t len)
 {
 	struct spi_message	m;
 	size_t			l;
-	uint8_t			*scratch;
+	u8			*scratch;
 	struct spi_transfer	t;
 	int			status;
 
@@ -525,7 +525,7 @@ static int dataflash_write_user_otp(struct mtd_info *mtd,
 {
 	struct spi_message	m;
 	const size_t		l = 4 + 64;
-	uint8_t			*scratch;
+	u8			*scratch;
 	struct spi_transfer	t;
 	struct dataflash	*priv = mtd->priv;
 	int			status;
@@ -667,14 +667,14 @@ struct flash_info {
 	/* JEDEC id has a high byte of zero plus three data bytes:
 	 * the manufacturer id, then a two byte device id.
 	 */
-	uint32_t	jedec_id;
+	u32	jedec_id;
 
 	/* The size listed here is what works with OP_ERASE_PAGE. */
 	unsigned	nr_pages;
-	uint16_t	pagesize;
-	uint16_t	pageoffset;
+	u16		pagesize;
+	u16		pageoffset;
 
-	uint16_t	flags;
+	u16		flags;
 #define SUP_POW2PS	0x0002		/* supports 2^N byte pages */
 #define IS_POW2PS	0x0001		/* uses 2^N byte pages */
 };
@@ -717,9 +717,9 @@ static struct flash_info dataflash_data [] = {
 static struct flash_info * jedec_probe(struct spi_device *spi)
 {
 	int			tmp;
-	uint8_t			code = OP_READ_ID;
-	uint8_t			id[3];
-	uint32_t		jedec;
+	u8			code = OP_READ_ID;
+	u8			id[3];
+	u32			jedec;
 	struct flash_info	*info;
 	int status;
 
-- 
2.9.4


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[PATCH 2/6] mtd: dataflash: Improve coding style in jedec_probe()

[Andrey Smirnov]

Change the following:

   - Replace indentation between type and name of local variable from
     tabs to spaces

   - Replace magic number 0x1F with CFI_MFR_ATMEL macro

   - Replace variable 'tmp' with 'ret' and 'i' where appropriate

   - Reformat multi-line comments and add newlines where appropriate

No functional change intended.

This is a backport of kernel commit
41c9c6621afa22c86fe74cf07536fd21c7719ca6

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
---
 drivers/mtd/devices/mtd_dataflash.c | 31 +++++++++++++++++--------------
 1 file changed, 17 insertions(+), 14 deletions(-)

diff --git a/drivers/mtd/devices/mtd_dataflash.c b/drivers/mtd/devices/mtd_dataflash.c
index cdbb194..f47553a 100644
--- a/drivers/mtd/devices/mtd_dataflash.c
+++ b/drivers/mtd/devices/mtd_dataflash.c
@@ -83,6 +83,7 @@
 #define OP_WRITE_SECURITY_REVC	0x9A
 #define OP_WRITE_SECURITY	0x9B	/* revision D */
 
+#define CFI_MFR_ATMEL		0x1F
 
 struct dataflash {
 	u8			command[4];
@@ -716,14 +717,15 @@ static struct flash_info dataflash_data [] = {
 
 static struct flash_info * jedec_probe(struct spi_device *spi)
 {
-	int			tmp;
-	u8			code = OP_READ_ID;
-	u8			id[3];
-	u32			jedec;
-	struct flash_info	*info;
+	int ret, i;
+	u8 code = OP_READ_ID;
+	u8 id[3];
+	u32 jedec;
+	struct flash_info *info;
 	int status;
 
-	/* JEDEC also defines an optional "extended device information"
+	/*
+	 * JEDEC also defines an optional "extended device information"
 	 * string for after vendor-specific data, after the three bytes
 	 * we use here.  Supporting some chips might require using it.
 	 *
@@ -731,13 +733,14 @@ static struct flash_info * jedec_probe(struct spi_device *spi)
 	 * That's not an error; only rev C and newer chips handle it, and
 	 * only Atmel sells these chips.
 	 */
-	tmp = spi_write_then_read(spi, &code, 1, id, 3);
-	if (tmp < 0) {
+	ret = spi_write_then_read(spi, &code, 1, id, 3);
+	if (ret < 0) {
 		pr_debug("%s: error %d reading JEDEC ID\n",
-			dev_name(&spi->dev), tmp);
-		return ERR_PTR(tmp);
+			dev_name(&spi->dev), ret);
+		return ERR_PTR(ret);
 	}
-	if (id[0] != 0x1f)
+
+	if (id[0] != CFI_MFR_ATMEL)
 		return NULL;
 
 	jedec = id[0];
@@ -746,9 +749,9 @@ static struct flash_info * jedec_probe(struct spi_device *spi)
 	jedec = jedec << 8;
 	jedec |= id[2];
 
-	for (tmp = 0, info = dataflash_data;
-			tmp < ARRAY_SIZE(dataflash_data);
-			tmp++, info++) {
+	for (i = 0, info = dataflash_data;
+			i < ARRAY_SIZE(dataflash_data);
+			i++, info++) {
 		if (info->jedec_id == jedec) {
 			pr_debug("%s: OTP, sector protect%s\n",
 				dev_name(&spi->dev),
-- 
2.9.4


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[PATCH 3/6] mtd: dataflash: Replace pr_debug, printk with dev_* functions

[Andrey Smirnov]

Lion's share of calls to pr_debug in this driver follow the pattern of
pr_debug("%s <message>", dev_name(<dev>), <arguments>), which should
be semantically identical to dev_dbg(<dev>, "<message>", <arguments>),
so replace such occurencies to simplify the code.

Convert the small minority of pr_debug that do not follow pattern from
above to use dev_dbg as well, for the sake of consistency.

Convert similar patter of printk(KERN_ERR, "%s: ...", dev_name(...),
...) to use dev_err instead.

No functional change intended.

This is a backport of kernel commit
02f62864f6cebbbbff6bb611fddf78c1d05a9747

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
---
 drivers/mtd/devices/mtd_dataflash.c | 75 ++++++++++++++++---------------------
 1 file changed, 33 insertions(+), 42 deletions(-)

diff --git a/drivers/mtd/devices/mtd_dataflash.c b/drivers/mtd/devices/mtd_dataflash.c
index f47553a..96dd35e 100644
--- a/drivers/mtd/devices/mtd_dataflash.c
+++ b/drivers/mtd/devices/mtd_dataflash.c
@@ -123,8 +123,7 @@ static int dataflash_waitready(struct spi_device *spi)
 	for (;;) {
 		status = dataflash_status(spi);
 		if (status < 0) {
-			pr_debug("%s: status %d?\n",
-					dev_name(&spi->dev), status);
+			dev_dbg(&spi->dev, "status %d?\n", status);
 			status = 0;
 		}
 
@@ -150,9 +149,8 @@ static int dataflash_erase(struct mtd_info *mtd, struct erase_info *instr)
 	u8			*command;
 	u32			rem;
 
-	pr_debug("%s: erase addr=0x%llx len 0x%llx\n",
-	      dev_name(&spi->dev), (long long)instr->addr,
-	      (long long)instr->len);
+	dev_dbg(&spi->dev, "erase addr=0x%llx len 0x%llx\n",
+		(long long)instr->addr, (long long)instr->len);
 
 	div_u64_rem(instr->len, priv->page_size, &rem);
 	if (rem)
@@ -186,7 +184,7 @@ static int dataflash_erase(struct mtd_info *mtd, struct erase_info *instr)
 		command[2] = (u8)(pageaddr >> 8);
 		command[3] = 0;
 
-		pr_debug("ERASE %s: (%x) %x %x %x [%i]\n",
+		dev_dbg(&spi->dev, "ERASE %s: (%x) %x %x %x [%i]\n",
 			do_block ? "block" : "page",
 			command[0], command[1], command[2], command[3],
 			pageaddr);
@@ -195,8 +193,8 @@ static int dataflash_erase(struct mtd_info *mtd, struct erase_info *instr)
 		(void) dataflash_waitready(spi);
 
 		if (status < 0) {
-			printk(KERN_ERR "%s: erase %x, err %d\n",
-				dev_name(&spi->dev), pageaddr, status);
+			dev_err(&spi->dev, "erase %x, err %d\n",
+				pageaddr, status);
 			/* REVISIT:  can retry instr->retries times; or
 			 * giveup and instr->fail_addr = instr->addr;
 			 */
@@ -236,8 +234,8 @@ static int dataflash_read(struct mtd_info *mtd, loff_t from, size_t len,
 	u8			*command;
 	int			status;
 
-	pr_debug("%s: read 0x%x..0x%x\n", dev_name(&priv->spi->dev),
-			(unsigned)from, (unsigned)(from + len));
+	dev_dbg(&priv->spi->dev, "read 0x%x..0x%x\n",
+		(unsigned)from, (unsigned)(from + len));
 
 	/* Calculate flash page/byte address */
 	addr = (((unsigned)from / priv->page_size) << priv->page_offset)
@@ -245,7 +243,7 @@ static int dataflash_read(struct mtd_info *mtd, loff_t from, size_t len,
 
 	command = priv->command;
 
-	pr_debug("READ: (%x) %x %x %x\n",
+	dev_dbg(&priv->spi->dev, "READ: (%x) %x %x %x\n",
 		command[0], command[1], command[2], command[3]);
 
 	spi_message_init(&msg);
@@ -276,8 +274,7 @@ static int dataflash_read(struct mtd_info *mtd, loff_t from, size_t len,
 		*retlen = msg.actual_length - 8;
 		status = 0;
 	} else
-		pr_debug("%s: read %x..%x --> %d\n",
-			dev_name(&priv->spi->dev),
+		dev_dbg(&priv->spi->dev, "read %x..%x --> %d\n",
 			(unsigned)from, (unsigned)(from + len),
 			status);
 	return status;
@@ -303,8 +300,8 @@ static int dataflash_write(struct mtd_info *mtd, loff_t to, size_t len,
 	int			status = -EINVAL;
 	u8			*command;
 
-	pr_debug("%s: write 0x%x..0x%x\n",
-		dev_name(&spi->dev), (unsigned)to, (unsigned)(to + len));
+	dev_dbg(&spi->dev, "write 0x%x..0x%x\n",
+		(unsigned)to, (unsigned)(to + len));
 
 	spi_message_init(&msg);
 
@@ -322,7 +319,7 @@ static int dataflash_write(struct mtd_info *mtd, loff_t to, size_t len,
 		writelen = len;
 
 	while (remaining > 0) {
-		pr_debug("write @ %i:%i len=%i\n",
+		dev_dbg(&spi->dev, "write @ %i:%i len=%i\n",
 			pageaddr, offset, writelen);
 
 		/* REVISIT:
@@ -350,13 +347,13 @@ static int dataflash_write(struct mtd_info *mtd, loff_t to, size_t len,
 			command[2] = (addr & 0x0000FF00) >> 8;
 			command[3] = 0;
 
-			pr_debug("TRANSFER: (%x) %x %x %x\n",
+			dev_dbg(&spi->dev, "TRANSFER: (%x) %x %x %x\n",
 				command[0], command[1], command[2], command[3]);
 
 			status = spi_sync(spi, &msg);
 			if (status < 0)
-				pr_debug("%s: xfer %u -> %d\n",
-					dev_name(&spi->dev), addr, status);
+				dev_dbg(&spi->dev, "xfer %u -> %d\n",
+					addr, status);
 
 			(void) dataflash_waitready(priv->spi);
 		}
@@ -368,7 +365,7 @@ static int dataflash_write(struct mtd_info *mtd, loff_t to, size_t len,
 		command[2] = (addr & 0x0000FF00) >> 8;
 		command[3] = (addr & 0x000000FF);
 
-		pr_debug("PROGRAM: (%x) %x %x %x\n",
+		dev_dbg(&spi->dev, "PROGRAM: (%x) %x %x %x\n",
 			command[0], command[1], command[2], command[3]);
 
 		x[1].tx_buf = writebuf;
@@ -377,8 +374,8 @@ static int dataflash_write(struct mtd_info *mtd, loff_t to, size_t len,
 		status = spi_sync(spi, &msg);
 		spi_transfer_del(x + 1);
 		if (status < 0)
-			pr_debug("%s: pgm %u/%u -> %d\n",
-				dev_name(&spi->dev), addr, writelen, status);
+			dev_dbg(&spi->dev, "pgm %u/%u -> %d\n",
+				addr, writelen, status);
 
 		(void) dataflash_waitready(priv->spi);
 
@@ -392,20 +389,20 @@ static int dataflash_write(struct mtd_info *mtd, loff_t to, size_t len,
 		command[2] = (addr & 0x0000FF00) >> 8;
 		command[3] = 0;
 
-		pr_debug("COMPARE: (%x) %x %x %x\n",
+		dev_dbg(&spi->dev, "COMPARE: (%x) %x %x %x\n",
 			command[0], command[1], command[2], command[3]);
 
 		status = spi_sync(spi, &msg);
 		if (status < 0)
-			pr_debug("%s: compare %u -> %d\n",
-				dev_name(&spi->dev), addr, status);
+			dev_dbg(&spi->dev, "compare %u -> %d\n",
+				addr, status);
 
 		status = dataflash_waitready(priv->spi);
 
 		/* Check result of the compare operation */
 		if (status & (1 << 6)) {
-			printk(KERN_ERR "%s: compare page %u, err %d\n",
-				dev_name(&spi->dev), pageaddr, status);
+			dev_err(&spi->dev, "compare page %u, err %d\n",
+				pageaddr, status);
 			remaining = 0;
 			status = -EIO;
 			break;
@@ -735,8 +732,7 @@ static struct flash_info * jedec_probe(struct spi_device *spi)
 	 */
 	ret = spi_write_then_read(spi, &code, 1, id, 3);
 	if (ret < 0) {
-		pr_debug("%s: error %d reading JEDEC ID\n",
-			dev_name(&spi->dev), ret);
+		dev_dbg(&spi->dev, "error %d reading JEDEC ID\n", ret);
 		return ERR_PTR(ret);
 	}
 
@@ -753,16 +749,14 @@ static struct flash_info * jedec_probe(struct spi_device *spi)
 			i < ARRAY_SIZE(dataflash_data);
 			i++, info++) {
 		if (info->jedec_id == jedec) {
-			pr_debug("%s: OTP, sector protect%s\n",
-				dev_name(&spi->dev),
-				(info->flags & SUP_POW2PS)
-					? ", binary pagesize" : ""
-				);
+			dev_dbg(&spi->dev, "OTP, sector protect%s\n",
+				(info->flags & SUP_POW2PS) ?
+				", binary pagesize" : "");
 			if (info->flags & SUP_POW2PS) {
 				status = dataflash_status(spi);
 				if (status < 0) {
-					pr_debug("%s: status error %d\n",
-						dev_name(&spi->dev), status);
+					dev_dbg(&spi->dev, "status error %d\n",
+						status);
 					return ERR_PTR(status);
 				}
 				if (status & 0x1) {
@@ -827,8 +821,7 @@ static int dataflash_probe(struct device_d *dev)
 	 */
 	status = dataflash_status(spi);
 	if (status <= 0 || status == 0xff) {
-		pr_debug("%s: status error %d\n",
-				dev_name(&spi->dev), status);
+		dev_dbg(&spi->dev, "status error %d\n", status);
 		if (status == 0 || status == 0xff)
 			status = -ENODEV;
 		return status;
@@ -863,14 +856,12 @@ static int dataflash_probe(struct device_d *dev)
 		break;
 	/* obsolete AT45DB1282 not (yet?) supported */
 	default:
-		pr_debug("%s: unsupported device (%x)\n", dev_name(&spi->dev),
-				status & 0x3c);
+		dev_dbg(&spi->dev, "unsupported device (%x)\n", status & 0x3c);
 		status = -ENODEV;
 	}
 
 	if (status < 0)
-		pr_debug("%s: add_dataflash --> %d\n", dev_name(&spi->dev),
-				status);
+		dev_dbg(&spi->dev, "add_dataflash --> %d\n", status);
 
 	return status;
 }
-- 
2.9.4


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[PATCH 4/6] mtd: dataflash: Get rid of loop counter in jedec_probe()

[Andrey Smirnov]

"For" loop in jedec_probe can be simplified to not need counter
'i'. Convert the code and get rid of the variable.

This is a backport of kernel commit
a296a1bc3eb54382d2a61d47529e71c9d3bc615e

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
---
 drivers/mtd/devices/mtd_dataflash.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/mtd/devices/mtd_dataflash.c b/drivers/mtd/devices/mtd_dataflash.c
index 96dd35e..fae36b6 100644
--- a/drivers/mtd/devices/mtd_dataflash.c
+++ b/drivers/mtd/devices/mtd_dataflash.c
@@ -714,7 +714,7 @@ static struct flash_info dataflash_data [] = {
 
 static struct flash_info * jedec_probe(struct spi_device *spi)
 {
-	int ret, i;
+	int ret;
 	u8 code = OP_READ_ID;
 	u8 id[3];
 	u32 jedec;
@@ -745,9 +745,9 @@ static struct flash_info * jedec_probe(struct spi_device *spi)
 	jedec = jedec << 8;
 	jedec |= id[2];
 
-	for (i = 0, info = dataflash_data;
-			i < ARRAY_SIZE(dataflash_data);
-			i++, info++) {
+	for (info = dataflash_data;
+	     info < dataflash_data + ARRAY_SIZE(dataflash_data);
+	     info++) {
 		if (info->jedec_id == jedec) {
 			dev_dbg(&spi->dev, "OTP, sector protect%s\n",
 				(info->flags & SUP_POW2PS) ?
-- 
2.9.4


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[PATCH 5/6] mtd: dataflash: Make use of "extened device information"

[Andrey Smirnov]

In anticipation of supporting chips that need it, extend the size of
struct flash_info's 'jedec_id' field to make room 2 byte of extended
device information as well as add code to fetch this data during
jedec_probe().

This is a backport of kernel commit
1da8869a428317a6d3cd8d47184cf87feb34a98b

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
---
 drivers/mtd/devices/mtd_dataflash.c | 89 ++++++++++++++++++++++++-------------
 1 file changed, 58 insertions(+), 31 deletions(-)

diff --git a/drivers/mtd/devices/mtd_dataflash.c b/drivers/mtd/devices/mtd_dataflash.c
index fae36b6..c1c29b7 100644
--- a/drivers/mtd/devices/mtd_dataflash.c
+++ b/drivers/mtd/devices/mtd_dataflash.c
@@ -85,6 +85,9 @@
 
 #define CFI_MFR_ATMEL		0x1F
 
+#define DATAFLASH_SHIFT_EXTID	24
+#define DATAFLASH_SHIFT_ID	40
+
 struct dataflash {
 	u8			command[4];
 	char			name[24];
@@ -665,7 +668,7 @@ struct flash_info {
 	/* JEDEC id has a high byte of zero plus three data bytes:
 	 * the manufacturer id, then a two byte device id.
 	 */
-	u32	jedec_id;
+	u64	jedec_id;
 
 	/* The size listed here is what works with OP_ERASE_PAGE. */
 	unsigned	nr_pages;
@@ -673,6 +676,7 @@ struct flash_info {
 	u16		pageoffset;
 
 	u16		flags;
+#define SUP_EXTID	0x0004		/* supports extended ID data */
 #define SUP_POW2PS	0x0002		/* supports 2^N byte pages */
 #define IS_POW2PS	0x0001		/* uses 2^N byte pages */
 };
@@ -712,42 +716,18 @@ static struct flash_info dataflash_data [] = {
 	{ "at45db642d",  0x1f2800, 8192, 1024, 10, SUP_POW2PS | IS_POW2PS},
 };
 
-static struct flash_info * jedec_probe(struct spi_device *spi)
+static struct flash_info *jedec_lookup(struct spi_device *spi,
+				       u64 jedec, bool use_extid)
 {
-	int ret;
-	u8 code = OP_READ_ID;
-	u8 id[3];
-	u32 jedec;
 	struct flash_info *info;
 	int status;
 
-	/*
-	 * JEDEC also defines an optional "extended device information"
-	 * string for after vendor-specific data, after the three bytes
-	 * we use here.  Supporting some chips might require using it.
-	 *
-	 * If the vendor ID isn't Atmel's (0x1f), assume this call failed.
-	 * That's not an error; only rev C and newer chips handle it, and
-	 * only Atmel sells these chips.
-	 */
-	ret = spi_write_then_read(spi, &code, 1, id, 3);
-	if (ret < 0) {
-		dev_dbg(&spi->dev, "error %d reading JEDEC ID\n", ret);
-		return ERR_PTR(ret);
-	}
-
-	if (id[0] != CFI_MFR_ATMEL)
-		return NULL;
-
-	jedec = id[0];
-	jedec = jedec << 8;
-	jedec |= id[1];
-	jedec = jedec << 8;
-	jedec |= id[2];
-
 	for (info = dataflash_data;
 	     info < dataflash_data + ARRAY_SIZE(dataflash_data);
 	     info++) {
+		if (use_extid && !(info->flags & SUP_EXTID))
+			continue;
+
 		if (info->jedec_id == jedec) {
 			dev_dbg(&spi->dev, "OTP, sector protect%s\n",
 				(info->flags & SUP_POW2PS) ?
@@ -771,12 +751,59 @@ static struct flash_info * jedec_probe(struct spi_device *spi)
 		}
 	}
 
+	return ERR_PTR(-ENODEV);
+}
+
+static struct flash_info * jedec_probe(struct spi_device *spi)
+{
+	int ret;
+	u8 code = OP_READ_ID;
+	u64 jedec;
+	u8 id[sizeof(jedec)] = {0};
+	const unsigned int id_size = 5;
+	struct flash_info *info;
+
+	/*
+	 * JEDEC also defines an optional "extended device information"
+	 * string for after vendor-specific data, after the three bytes
+	 * we use here.  Supporting some chips might require using it.
+	 *
+	 * If the vendor ID isn't Atmel's (0x1f), assume this call failed.
+	 * That's not an error; only rev C and newer chips handle it, and
+	 * only Atmel sells these chips.
+	 */
+	ret = spi_write_then_read(spi, &code, 1, id, id_size);
+	if (ret < 0) {
+		dev_dbg(&spi->dev, "error %d reading JEDEC ID\n", ret);
+		return ERR_PTR(ret);
+	}
+
+	if (id[0] != CFI_MFR_ATMEL)
+		return NULL;
+
+	jedec = be64_to_cpup((__be64 *)id);
+
+	/*
+	 * First, try to match device using extended device
+	 * information
+	 */
+	info = jedec_lookup(spi, jedec >> DATAFLASH_SHIFT_EXTID, true);
+	if (!IS_ERR(info))
+		return info;
+	/*
+	 * If that fails, make another pass using regular ID
+	 * information
+	 */
+	info = jedec_lookup(spi, jedec >> DATAFLASH_SHIFT_ID, false);
+	if (!IS_ERR(info))
+		return info;
+
 	/*
 	 * Treat other chips as errors ... we won't know the right page
 	 * size (it might be binary) even when we can tell which density
 	 * class is involved (legacy chip id scheme).
 	 */
-	dev_warn(&spi->dev, "JEDEC id %06x not handled\n", jedec);
+	dev_warn(&spi->dev, "JEDEC id %016llx not handled\n", jedec);
 	return ERR_PTR(-ENODEV);
 }
 
-- 
2.9.4


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[PATCH 6/6] mtd: dataflash: Add flash_info for AT45DB641E

[Andrey Smirnov]

This is a backport of kernel commit
67e4145ebf2c161d7404770461b8404f00a6d3bf

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
---
 drivers/mtd/devices/mtd_dataflash.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/mtd/devices/mtd_dataflash.c b/drivers/mtd/devices/mtd_dataflash.c
index c1c29b7..4b8eaec 100644
--- a/drivers/mtd/devices/mtd_dataflash.c
+++ b/drivers/mtd/devices/mtd_dataflash.c
@@ -714,6 +714,9 @@ static struct flash_info dataflash_data [] = {
 
 	{ "AT45DB642x",  0x1f2800, 8192, 1056, 11, SUP_POW2PS},
 	{ "at45db642d",  0x1f2800, 8192, 1024, 10, SUP_POW2PS | IS_POW2PS},
+
+	{ "AT45DB641E",  0x1f28000100, 32768, 264, 9, SUP_EXTID | SUP_POW2PS},
+	{ "at45db641e",  0x1f28000100, 32768, 256, 8, SUP_EXTID | SUP_POW2PS | IS_POW2PS},
 };
 
 static struct flash_info *jedec_lookup(struct spi_device *spi,
-- 
2.9.4


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Re: [PATCH 0/6] Backport support for "extended device ID" for dataflash

[Sascha Hauer]

On Mon, Jun 19, 2017 at 07:44:25AM -0700, Andrey Smirnov wrote:
> Hi everyone,
> 
> This series is a backport of almost identical patchset that I did for
> linux kernel:
> 
>       1. lkml.kernel.org/r/20170421163026.24884-1-andrew.smirnov@gmail.com
>       2. lkml.kernel.org/r/20170421163026.24884-2-andrew.smirnov@gmail.com
>       3. lkml.kernel.org/r/20170421163026.24884-3-andrew.smirnov@gmail.com
>       4. lkml.kernel.org/r/20170421163026.24884-4-andrew.smirnov@gmail.com
>       5. lkml.kernel.org/r/20170421163026.24884-5-andrew.smirnov@gmail.com
>       6. lkml.kernel.org/r/20170421163026.24884-6-andrew.smirnov@gmail.com
> 
> The patchset hasn't hit Linus' tree yet, but it can be found in
> linux-next:
> 	https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/log/drivers/mtd/devices/mtd_dataflash.c
> 
> Let me know if anything needs changing.

Fine as-is, applied, thanks

Sascha


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