Message-Id: <20200109075551.357179-1-gch981213@gmail.com>
Date:   Thu,  9 Jan 2020 15:54:00 +0800
From:   Chuanhong Guo <gch981213@...il.com>
To:     linux-mtd@...ts.infradead.org,
        Boris Brezillon <bbrezillon@...nel.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     Chuanhong Guo <gch981213@...il.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] mtd: nand: spi: rework detect procedure for different read id op

Currently there are 3 different variants of read_id implementation:
1. opcode only. Found in GD5FxGQ4xF.
2. opcode + 1 addr byte. Found in GD5GxGQ4xA/E
3. opcode + 1 dummy byte. Found in other currently supported chips.

Original implementation was for variant 1 and let detect function
of chips with variant 2 and 3 to ignore the first byte. This isn't
robust:

1. For chips of variant 2, if SPI master doesn't keep MOSI low
during read, chip will get a random id offset, and the entire id
buffer will shift by that offset, causing detect failure.

2. For chips of variant 1, if it happens to get a devid that equals
to manufacture id of variant 2 or 3 chips, it'll get incorrectly
detected.

This patch reworks detect procedure to address problems above. New
logic do detection for all variants separatedly, in 1-2-3 order.
Since all current detect methods do exactly the same id matching
procedure, unify them into core.c and remove detect method from
manufacture_ops.

Tested on GD5F1GQ4UAYIG and W25N01GVZEIG.

Signed-off-by: Chuanhong Guo <gch981213@...il.com>
---
 drivers/mtd/nand/spi/core.c       | 89 +++++++++++++++++++++++--------
 drivers/mtd/nand/spi/gigadevice.c | 46 ++++++----------
 drivers/mtd/nand/spi/macronix.c   | 25 ++-------
 drivers/mtd/nand/spi/micron.c     | 24 ++-------
 drivers/mtd/nand/spi/paragon.c    | 23 ++------
 drivers/mtd/nand/spi/toshiba.c    | 25 ++-------
 drivers/mtd/nand/spi/winbond.c    | 29 ++--------
 include/linux/mtd/spinand.h       | 24 ++++-----
 8 files changed, 110 insertions(+), 175 deletions(-)

diff --git a/drivers/mtd/nand/spi/core.c b/drivers/mtd/nand/spi/core.c
index 89f6beefb01c..91293cb10b18 100644
--- a/drivers/mtd/nand/spi/core.c
+++ b/drivers/mtd/nand/spi/core.c
@@ -370,10 +370,11 @@ static int spinand_wait(struct spinand_device *spinand, u8 *s)
 	return status & STATUS_BUSY ? -ETIMEDOUT : 0;
 }
 
-static int spinand_read_id_op(struct spinand_device *spinand, u8 *buf)
+static int spinand_read_id_op(struct spinand_device *spinand, u8 naddr,
+			      u8 ndummy, u8 *buf)
 {
-	struct spi_mem_op op = SPINAND_READID_OP(0, spinand->scratchbuf,
-						 SPINAND_MAX_ID_LEN);
+	struct spi_mem_op op = SPINAND_READID_OP(
+		naddr, ndummy, spinand->scratchbuf, SPINAND_MAX_ID_LEN);
 	int ret;
 
 	ret = spi_mem_exec_op(spinand->spimem, &op);
@@ -753,33 +754,85 @@ static const struct nand_ops spinand_ops = {
 	.isbad = spinand_isbad,
 };
 
-static const struct spinand_manufacturer *spinand_manufacturers[] = {
+static const struct spinand_manufacturer *spinand_manufacturers_op_id[] = {
 	&gigadevice_spinand_manufacturer,
+	NULL
+};
+
+static const struct spinand_manufacturer *spinand_manufacturers_op_1a_id[] = {
+	&gigadevice_spinand_manufacturer_1a_id,
+	NULL
+};
+
+static const struct spinand_manufacturer *spinand_manufacturers_op_1d_id[] = {
 	&macronix_spinand_manufacturer,
 	&micron_spinand_manufacturer,
 	&paragon_spinand_manufacturer,
 	&toshiba_spinand_manufacturer,
 	&winbond_spinand_manufacturer,
+	NULL
 };
 
-static int spinand_manufacturer_detect(struct spinand_device *spinand)
+static int
+spinand_manufacturer_match_id(struct spinand_device *spinand,
+			      const struct spinand_manufacturer **manufacturers)
 {
-	unsigned int i;
+	u8 *id = spinand->id.data;
+	unsigned int i, j;
+	u16 devid;
 	int ret;
 
-	for (i = 0; i < ARRAY_SIZE(spinand_manufacturers); i++) {
-		ret = spinand_manufacturers[i]->ops->detect(spinand);
-		if (ret > 0) {
-			spinand->manufacturer = spinand_manufacturers[i];
-			return 0;
-		} else if (ret < 0) {
-			return ret;
-		}
-	}
+	for (i = 0; manufacturers[i]; i++) {
+		if (id[0] != manufacturers[i]->id)
+			continue;
 
+		devid = 0;
+		for (j = 0; j < manufacturers[i]->devid_len; j++)
+			devid = devid << 8 | id[j + 1];
+
+		ret = spinand_match_and_init(spinand,
+					     manufacturers[i]->spinand_table,
+					     manufacturers[i]->nchips, devid);
+		if (ret < 0)
+			continue;
+
+		spinand->manufacturer = manufacturers[i];
+		spinand->id.len = 1 + manufacturers[i]->devid_len;
+		return 0;
+	}
 	return -ENOTSUPP;
 }
 
+static int spinand_manufacturer_detect(struct spinand_device *spinand)
+{
+	u8 *id = spinand->id.data;
+	int ret;
+
+	ret = spinand_read_id_op(spinand, 0, 0, id);
+	if (ret)
+		return ret;
+	ret = spinand_manufacturer_match_id(spinand,
+					    spinand_manufacturers_op_id);
+	if (!ret)
+		return 0;
+
+	ret = spinand_read_id_op(spinand, 1, 0, id);
+	if (ret)
+		return ret;
+	ret = spinand_manufacturer_match_id(spinand,
+					    spinand_manufacturers_op_1a_id);
+	if (!ret)
+		return 0;
+
+	ret = spinand_read_id_op(spinand, 0, 1, id);
+	if (ret)
+		return ret;
+	ret = spinand_manufacturer_match_id(spinand,
+					    spinand_manufacturers_op_1d_id);
+
+	return ret;
+}
+
 static int spinand_manufacturer_init(struct spinand_device *spinand)
 {
 	if (spinand->manufacturer->ops->init)
@@ -898,12 +951,6 @@ static int spinand_detect(struct spinand_device *spinand)
 	if (ret)
 		return ret;
 
-	ret = spinand_read_id_op(spinand, spinand->id.data);
-	if (ret)
-		return ret;
-
-	spinand->id.len = SPINAND_MAX_ID_LEN;
-
 	ret = spinand_manufacturer_detect(spinand);
 	if (ret) {
 		dev_err(dev, "unknown raw ID %*phN\n", SPINAND_MAX_ID_LEN,
diff --git a/drivers/mtd/nand/spi/gigadevice.c b/drivers/mtd/nand/spi/gigadevice.c
index e99d425aa93f..363a1ad41dfa 100644
--- a/drivers/mtd/nand/spi/gigadevice.c
+++ b/drivers/mtd/nand/spi/gigadevice.c
@@ -194,7 +194,7 @@ static int gd5fxgq4ufxxg_ecc_get_status(struct spinand_device *spinand,
 	return -EINVAL;
 }
 
-static const struct spinand_info gigadevice_spinand_table[] = {
+static const struct spinand_info gigadevice_spinand_table_id1[] = {
 	SPINAND_INFO("GD5F1GQ4xA", 0xF1,
 		     NAND_MEMORG(1, 2048, 64, 64, 1024, 20, 1, 1, 1),
 		     NAND_ECCREQ(8, 512),
@@ -231,6 +231,9 @@ static const struct spinand_info gigadevice_spinand_table[] = {
 		     0,
 		     SPINAND_ECCINFO(&gd5fxgq4_variant2_ooblayout,
 				     gd5fxgq4uexxg_ecc_get_status)),
+};
+
+static const struct spinand_info gigadevice_spinand_table_id2[] = {
 	SPINAND_INFO("GD5F1GQ4UFxxG", 0xb148,
 		     NAND_MEMORG(1, 2048, 128, 64, 1024, 20, 1, 1, 1),
 		     NAND_ECCREQ(8, 512),
@@ -242,39 +245,24 @@ static const struct spinand_info gigadevice_spinand_table[] = {
 				     gd5fxgq4ufxxg_ecc_get_status)),
 };
 
-static int gigadevice_spinand_detect(struct spinand_device *spinand)
-{
-	u8 *id = spinand->id.data;
-	u16 did;
-	int ret;
-
-	/*
-	 * Earlier GDF5-series devices (A,E) return [0][MID][DID]
-	 * Later (F) devices return [MID][DID1][DID2]
-	 */
-
-	if (id[0] == SPINAND_MFR_GIGADEVICE)
-		did = (id[1] << 8) + id[2];
-	else if (id[0] == 0 && id[1] == SPINAND_MFR_GIGADEVICE)
-		did = id[2];
-	else
-		return 0;
-
-	ret = spinand_match_and_init(spinand, gigadevice_spinand_table,
-				     ARRAY_SIZE(gigadevice_spinand_table),
-				     did);
-	if (ret)
-		return ret;
-
-	return 1;
-}
-
 static const struct spinand_manufacturer_ops gigadevice_spinand_manuf_ops = {
-	.detect = gigadevice_spinand_detect,
+};
+
+/* These chips need 1 addr byte in read_id op */
+const struct spinand_manufacturer gigadevice_spinand_manufacturer_1a_id = {
+	.id = SPINAND_MFR_GIGADEVICE,
+	.name = "GigaDevice",
+	.devid_len = 1,
+	.spinand_table = gigadevice_spinand_table_id1,
+	.nchips = ARRAY_SIZE(gigadevice_spinand_table_id1),
+	.ops = &gigadevice_spinand_manuf_ops,
 };
 
 const struct spinand_manufacturer gigadevice_spinand_manufacturer = {
 	.id = SPINAND_MFR_GIGADEVICE,
 	.name = "GigaDevice",
+	.devid_len = 2,
+	.spinand_table = gigadevice_spinand_table_id2,
+	.nchips = ARRAY_SIZE(gigadevice_spinand_table_id2),
 	.ops = &gigadevice_spinand_manuf_ops,
 };
diff --git a/drivers/mtd/nand/spi/macronix.c b/drivers/mtd/nand/spi/macronix.c
index 21def3f8fb36..7b384ce86d80 100644
--- a/drivers/mtd/nand/spi/macronix.c
+++ b/drivers/mtd/nand/spi/macronix.c
@@ -118,33 +118,14 @@ static const struct spinand_info macronix_spinand_table[] = {
 		     SPINAND_ECCINFO(&mx35lfxge4ab_ooblayout, NULL)),
 };
 
-static int macronix_spinand_detect(struct spinand_device *spinand)
-{
-	u8 *id = spinand->id.data;
-	int ret;
-
-	/*
-	 * Macronix SPI NAND read ID needs a dummy byte, so the first byte in
-	 * raw_id is garbage.
-	 */
-	if (id[1] != SPINAND_MFR_MACRONIX)
-		return 0;
-
-	ret = spinand_match_and_init(spinand, macronix_spinand_table,
-				     ARRAY_SIZE(macronix_spinand_table),
-				     id[2]);
-	if (ret)
-		return ret;
-
-	return 1;
-}
-
 static const struct spinand_manufacturer_ops macronix_spinand_manuf_ops = {
-	.detect = macronix_spinand_detect,
 };
 
 const struct spinand_manufacturer macronix_spinand_manufacturer = {
 	.id = SPINAND_MFR_MACRONIX,
 	.name = "Macronix",
+	.devid_len = 1,
+	.spinand_table = macronix_spinand_table,
+	.nchips = ARRAY_SIZE(macronix_spinand_table),
 	.ops = &macronix_spinand_manuf_ops,
 };
diff --git a/drivers/mtd/nand/spi/micron.c b/drivers/mtd/nand/spi/micron.c
index 7d7b1f7fcf71..0ad7d2eb1920 100644
--- a/drivers/mtd/nand/spi/micron.c
+++ b/drivers/mtd/nand/spi/micron.c
@@ -102,32 +102,14 @@ static const struct spinand_info micron_spinand_table[] = {
 				     mt29f2g01abagd_ecc_get_status)),
 };
 
-static int micron_spinand_detect(struct spinand_device *spinand)
-{
-	u8 *id = spinand->id.data;
-	int ret;
-
-	/*
-	 * Micron SPI NAND read ID need a dummy byte,
-	 * so the first byte in raw_id is dummy.
-	 */
-	if (id[1] != SPINAND_MFR_MICRON)
-		return 0;
-
-	ret = spinand_match_and_init(spinand, micron_spinand_table,
-				     ARRAY_SIZE(micron_spinand_table), id[2]);
-	if (ret)
-		return ret;
-
-	return 1;
-}
-
 static const struct spinand_manufacturer_ops micron_spinand_manuf_ops = {
-	.detect = micron_spinand_detect,
 };
 
 const struct spinand_manufacturer micron_spinand_manufacturer = {
 	.id = SPINAND_MFR_MICRON,
 	.name = "Micron",
+	.devid_len = 1,
+	.spinand_table = micron_spinand_table,
+	.nchips = ARRAY_SIZE(micron_spinand_table),
 	.ops = &micron_spinand_manuf_ops,
 };
diff --git a/drivers/mtd/nand/spi/paragon.c b/drivers/mtd/nand/spi/paragon.c
index 52307681cbd0..19f6f4269d47 100644
--- a/drivers/mtd/nand/spi/paragon.c
+++ b/drivers/mtd/nand/spi/paragon.c
@@ -117,31 +117,14 @@ static const struct spinand_info paragon_spinand_table[] = {
 				     pn26g0xa_ecc_get_status)),
 };
 
-static int paragon_spinand_detect(struct spinand_device *spinand)
-{
-	u8 *id = spinand->id.data;
-	int ret;
-
-	/* Read ID returns [0][MID][DID] */
-
-	if (id[1] != SPINAND_MFR_PARAGON)
-		return 0;
-
-	ret = spinand_match_and_init(spinand, paragon_spinand_table,
-				     ARRAY_SIZE(paragon_spinand_table),
-				     id[2]);
-	if (ret)
-		return ret;
-
-	return 1;
-}
-
 static const struct spinand_manufacturer_ops paragon_spinand_manuf_ops = {
-	.detect = paragon_spinand_detect,
 };
 
 const struct spinand_manufacturer paragon_spinand_manufacturer = {
 	.id = SPINAND_MFR_PARAGON,
 	.name = "Paragon",
+	.devid_len = 1,
+	.spinand_table = paragon_spinand_table,
+	.nchips = ARRAY_SIZE(paragon_spinand_table),
 	.ops = &paragon_spinand_manuf_ops,
 };
diff --git a/drivers/mtd/nand/spi/toshiba.c b/drivers/mtd/nand/spi/toshiba.c
index 1cb3760ff779..5724f6ca70c0 100644
--- a/drivers/mtd/nand/spi/toshiba.c
+++ b/drivers/mtd/nand/spi/toshiba.c
@@ -156,33 +156,14 @@ static const struct spinand_info toshiba_spinand_table[] = {
 				     tc58cxgxsx_ecc_get_status)),
 };
 
-static int toshiba_spinand_detect(struct spinand_device *spinand)
-{
-	u8 *id = spinand->id.data;
-	int ret;
-
-	/*
-	 * Toshiba SPI NAND read ID needs a dummy byte,
-	 * so the first byte in id is garbage.
-	 */
-	if (id[1] != SPINAND_MFR_TOSHIBA)
-		return 0;
-
-	ret = spinand_match_and_init(spinand, toshiba_spinand_table,
-				     ARRAY_SIZE(toshiba_spinand_table),
-				     id[2]);
-	if (ret)
-		return ret;
-
-	return 1;
-}
-
 static const struct spinand_manufacturer_ops toshiba_spinand_manuf_ops = {
-	.detect = toshiba_spinand_detect,
 };
 
 const struct spinand_manufacturer toshiba_spinand_manufacturer = {
 	.id = SPINAND_MFR_TOSHIBA,
 	.name = "Toshiba",
+	.devid_len = 1,
+	.spinand_table = toshiba_spinand_table,
+	.nchips = ARRAY_SIZE(toshiba_spinand_table),
 	.ops = &toshiba_spinand_manuf_ops,
 };
diff --git a/drivers/mtd/nand/spi/winbond.c b/drivers/mtd/nand/spi/winbond.c
index a6c17e0cace8..489bfe6be2f1 100644
--- a/drivers/mtd/nand/spi/winbond.c
+++ b/drivers/mtd/nand/spi/winbond.c
@@ -94,31 +94,6 @@ static const struct spinand_info winbond_spinand_table[] = {
 		     SPINAND_ECCINFO(&w25m02gv_ooblayout, NULL)),
 };
 
-/**
- * winbond_spinand_detect - initialize device related part in spinand_device
- * struct if it is a Winbond device.
- * @spinand: SPI NAND device structure
- */
-static int winbond_spinand_detect(struct spinand_device *spinand)
-{
-	u8 *id = spinand->id.data;
-	int ret;
-
-	/*
-	 * Winbond SPI NAND read ID need a dummy byte,
-	 * so the first byte in raw_id is dummy.
-	 */
-	if (id[1] != SPINAND_MFR_WINBOND)
-		return 0;
-
-	ret = spinand_match_and_init(spinand, winbond_spinand_table,
-				     ARRAY_SIZE(winbond_spinand_table), id[2]);
-	if (ret)
-		return ret;
-
-	return 1;
-}
-
 static int winbond_spinand_init(struct spinand_device *spinand)
 {
 	struct nand_device *nand = spinand_to_nand(spinand);
@@ -138,12 +113,14 @@ static int winbond_spinand_init(struct spinand_device *spinand)
 }
 
 static const struct spinand_manufacturer_ops winbond_spinand_manuf_ops = {
-	.detect = winbond_spinand_detect,
 	.init = winbond_spinand_init,
 };
 
 const struct spinand_manufacturer winbond_spinand_manufacturer = {
 	.id = SPINAND_MFR_WINBOND,
 	.name = "Winbond",
+	.devid_len = 1,
+	.spinand_table = winbond_spinand_table,
+	.nchips = ARRAY_SIZE(winbond_spinand_table),
 	.ops = &winbond_spinand_manuf_ops,
 };
diff --git a/include/linux/mtd/spinand.h b/include/linux/mtd/spinand.h
index 4ea558bd3c46..9e7968c6fdbf 100644
--- a/include/linux/mtd/spinand.h
+++ b/include/linux/mtd/spinand.h
@@ -32,9 +32,9 @@
 		   SPI_MEM_OP_NO_DUMMY,					\
 		   SPI_MEM_OP_NO_DATA)
 
-#define SPINAND_READID_OP(ndummy, buf, len)				\
+#define SPINAND_READID_OP(naddr, ndummy, buf, len)			\
 	SPI_MEM_OP(SPI_MEM_OP_CMD(0x9f, 1),				\
-		   SPI_MEM_OP_NO_ADDR,					\
+		   SPI_MEM_OP_ADDR(naddr, 0, 1),			\
 		   SPI_MEM_OP_DUMMY(ndummy, 1),				\
 		   SPI_MEM_OP_DATA_IN(len, buf, 1))
 
@@ -189,24 +189,13 @@ struct spinand_id {
 
 /**
  * struct manufacurer_ops - SPI NAND manufacturer specific operations
- * @detect: detect a SPI NAND device. Every time a SPI NAND device is probed
- *	    the core calls the struct_manufacurer_ops->detect() hook of each
- *	    registered manufacturer until one of them return 1. Note that
- *	    the first thing to check in this hook is that the manufacturer ID
- *	    in struct_spinand_device->id matches the manufacturer whose
- *	    ->detect() hook has been called. Should return 1 if there's a
- *	    match, 0 if the manufacturer ID does not match and a negative
- *	    error code otherwise. When true is returned, the core assumes
- *	    that properties of the NAND chip (spinand->base.memorg and
- *	    spinand->base.eccreq) have been filled
  * @init: initialize a SPI NAND device
  * @cleanup: cleanup a SPI NAND device
  *
  * Each SPI NAND manufacturer driver should implement this interface so that
- * NAND chips coming from this vendor can be detected and initialized properly.
+ * NAND chips coming from this vendor can be initialized properly.
  */
 struct spinand_manufacturer_ops {
-	int (*detect)(struct spinand_device *spinand);
 	int (*init)(struct spinand_device *spinand);
 	void (*cleanup)(struct spinand_device *spinand);
 };
@@ -215,15 +204,22 @@ struct spinand_manufacturer_ops {
  * struct spinand_manufacturer - SPI NAND manufacturer instance
  * @id: manufacturer ID
  * @name: manufacturer name
+ * @devid_len: number of bytes in device ID
+ * @spinand_table: array with info for spi nands under current manufacturer
+ * @nchips: number of chips available in spinand_table
  * @ops: manufacturer operations
  */
 struct spinand_manufacturer {
 	u8 id;
 	char *name;
+	u8 devid_len;
+	const struct spinand_info *spinand_table;
+	size_t nchips;
 	const struct spinand_manufacturer_ops *ops;
 };
 
 /* SPI NAND manufacturers */
+extern const struct spinand_manufacturer gigadevice_spinand_manufacturer_1a_id;
 extern const struct spinand_manufacturer gigadevice_spinand_manufacturer;
 extern const struct spinand_manufacturer macronix_spinand_manufacturer;
 extern const struct spinand_manufacturer micron_spinand_manufacturer;
-- 
2.24.1

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