generic: backport Winbond W25N02KV SPI-NAND support

This flash-chip is used on the Asus TUF-AX4200 and TUF-AX6000 routers.

As the filogic target only uses kernel 5.15, skip the 5.10 backport.

Signed-off-by: David Bauer <mail@david-bauer.net>

2 files changed, 146 insertions, 0 deletions

diff --git a/target/linux/generic/backport-5.15/890-v6.1-mtd-spinand-winbond-fix-flash-detection.patch b/target/linux/generic/backport-5.15/890-v6.1-mtd-spinand-winbond-fix-flash-detection.patch
new file mode 100644
index 0000000000..38fbc3a3d7
--- /dev/null
+++ b/target/linux/generic/backport-5.15/890-v6.1-mtd-spinand-winbond-fix-flash-detection.patch
@@ -0,0 +1,40 @@
+From dbf70fc204d2fbb0d8ad8f42038a60846502efda Mon Sep 17 00:00:00 2001
+From: Mikhail Kshevetskiy <mikhail.kshevetskiy@iopsys.eu>
+Date: Mon, 10 Oct 2022 13:51:09 +0300
+Subject: [PATCH] mtd: spinand: winbond: fix flash identification
+
+Winbond uses 3 bytes to identify flash: vendor_id, dev_id_0, dev_id_1,
+but current driver uses only first 2 bytes of it for devices
+identification. As result Winbond W25N02KV flash (id_bytes: EF, AA, 22)
+is identified as W25N01GV (id_bytes: EF, AA, 21).
+
+Fix this by adding missed identification bytes.
+
+Signed-off-by: Mikhail Kshevetskiy <mikhail.kshevetskiy@iopsys.eu>
+Reviewed-by: Frieder Schrempf <frieder.schrempf@kontron.de>
+Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
+Link: https://lore.kernel.org/linux-mtd/20221010105110.446674-1-mikhail.kshevetskiy@iopsys.eu
+---
+ drivers/mtd/nand/spi/winbond.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+--- a/drivers/mtd/nand/spi/winbond.c
++++ b/drivers/mtd/nand/spi/winbond.c
+@@ -76,7 +76,7 @@ static int w25m02gv_select_target(struct
+ 
+ static const struct spinand_info winbond_spinand_table[] = {
+ 	SPINAND_INFO("W25M02GV",
+-		     SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0xab),
++		     SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0xab, 0x21),
+ 		     NAND_MEMORG(1, 2048, 64, 64, 1024, 20, 1, 1, 2),
+ 		     NAND_ECCREQ(1, 512),
+ 		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
+@@ -86,7 +86,7 @@ static const struct spinand_info winbond
+ 		     SPINAND_ECCINFO(&w25m02gv_ooblayout, NULL),
+ 		     SPINAND_SELECT_TARGET(w25m02gv_select_target)),
+ 	SPINAND_INFO("W25N01GV",
+-		     SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0xaa),
++		     SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0xaa, 0x21),
+ 		     NAND_MEMORG(1, 2048, 64, 64, 1024, 20, 1, 1, 1),
+ 		     NAND_ECCREQ(1, 512),
+ 		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
diff --git a/target/linux/generic/backport-5.15/891-v6.1-mtd-spinand-winbond-add-W25N02KV.patch b/target/linux/generic/backport-5.15/891-v6.1-mtd-spinand-winbond-add-W25N02KV.patch
new file mode 100644
index 0000000000..d75a1acc57
--- /dev/null
+++ b/target/linux/generic/backport-5.15/891-v6.1-mtd-spinand-winbond-add-W25N02KV.patch
@@ -0,0 +1,106 @@
+From 6154c7a583483d7b69f53bea868efdc369edd563 Mon Sep 17 00:00:00 2001
+From: Mikhail Kshevetskiy <mikhail.kshevetskiy@iopsys.eu>
+Date: Mon, 10 Oct 2022 13:51:10 +0300
+Subject: [PATCH] mtd: spinand: winbond: add Winbond W25N02KV flash support
+
+Add support of Winbond W25N02KV flash
+
+Signed-off-by: Mikhail Kshevetskiy <mikhail.kshevetskiy@iopsys.eu>
+Reviewed-by: Frieder Schrempf <frieder.schrempf@kontron.de>
+Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
+Link: https://lore.kernel.org/linux-mtd/20221010105110.446674-2-mikhail.kshevetskiy@iopsys.eu
+---
+ drivers/mtd/nand/spi/winbond.c | 75 ++++++++++++++++++++++++++++++++++
+ 1 file changed, 75 insertions(+)
+
+--- a/drivers/mtd/nand/spi/winbond.c
++++ b/drivers/mtd/nand/spi/winbond.c
+@@ -74,6 +74,72 @@ static int w25m02gv_select_target(struct
+ 	return spi_mem_exec_op(spinand->spimem, &op);
+ }
+ 
++static int w25n02kv_ooblayout_ecc(struct mtd_info *mtd, int section,
++				  struct mtd_oob_region *region)
++{
++	if (section > 3)
++		return -ERANGE;
++
++	region->offset = 64 + (16 * section);
++	region->length = 13;
++
++	return 0;
++}
++
++static int w25n02kv_ooblayout_free(struct mtd_info *mtd, int section,
++				   struct mtd_oob_region *region)
++{
++	if (section > 3)
++		return -ERANGE;
++
++	region->offset = (16 * section) + 2;
++	region->length = 14;
++
++	return 0;
++}
++
++static const struct mtd_ooblayout_ops w25n02kv_ooblayout = {
++	.ecc = w25n02kv_ooblayout_ecc,
++	.free = w25n02kv_ooblayout_free,
++};
++
++static int w25n02kv_ecc_get_status(struct spinand_device *spinand,
++				   u8 status)
++{
++	struct nand_device *nand = spinand_to_nand(spinand);
++	u8 mbf = 0;
++	struct spi_mem_op op = SPINAND_GET_FEATURE_OP(0x30, &mbf);
++
++	switch (status & STATUS_ECC_MASK) {
++	case STATUS_ECC_NO_BITFLIPS:
++		return 0;
++
++	case STATUS_ECC_UNCOR_ERROR:
++		return -EBADMSG;
++
++	case STATUS_ECC_HAS_BITFLIPS:
++		/*
++		 * Let's try to retrieve the real maximum number of bitflips
++		 * in order to avoid forcing the wear-leveling layer to move
++		 * data around if it's not necessary.
++		 */
++		if (spi_mem_exec_op(spinand->spimem, &op))
++			return nanddev_get_ecc_conf(nand)->strength;
++
++		mbf >>= 4;
++
++		if (WARN_ON(mbf > nanddev_get_ecc_conf(nand)->strength || !mbf))
++			return nanddev_get_ecc_conf(nand)->strength;
++
++		return mbf;
++
++	default:
++		break;
++	}
++
++	return -EINVAL;
++}
++
+ static const struct spinand_info winbond_spinand_table[] = {
+ 	SPINAND_INFO("W25M02GV",
+ 		     SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0xab, 0x21),
+@@ -94,6 +160,15 @@ static const struct spinand_info winbond
+ 					      &update_cache_variants),
+ 		     0,
+ 		     SPINAND_ECCINFO(&w25m02gv_ooblayout, NULL)),
++	SPINAND_INFO("W25N02KV",
++		     SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0xaa, 0x22),
++		     NAND_MEMORG(1, 2048, 128, 64, 2048, 40, 1, 1, 1),
++		     NAND_ECCREQ(8, 512),
++		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
++					      &write_cache_variants,
++					      &update_cache_variants),
++		     0,
++		     SPINAND_ECCINFO(&w25n02kv_ooblayout, w25n02kv_ecc_get_status)),
+ };
+ 
+ static int winbond_spinand_init(struct spinand_device *spinand)