[PATCH 1/1] mtd: spinand: fmsh: add support for FM25G{01,02}B

[Ziyang Huang]

FM25G01B: https://www.fmsh.com/nvm/FM25G01B_ds_eng.pdf
FM25G02B: https://www.fmsh.com/nvm/FM25G02B_ds_eng.pdf

Signed-off-by: Ziyang Huang <hzyitc at outlook.com>
---
 drivers/mtd/nand/spi/fmsh.c | 101 ++++++++++++++++++++++++++++++++++++
 1 file changed, 101 insertions(+)

diff --git a/drivers/mtd/nand/spi/fmsh.c b/drivers/mtd/nand/spi/fmsh.c
index f417955f7d1c..d29e0f6529e2 100644
--- a/drivers/mtd/nand/spi/fmsh.c
+++ b/drivers/mtd/nand/spi/fmsh.c
@@ -9,6 +9,16 @@
 #include <linux/kernel.h>
 #include <linux/mtd/spinand.h>
 
+#define FM25G01B_STATUS_ECC_MASK		(7 << 4)
+	#define FM25G01B_STATUS_ECC_NO_BITFLIPS		(0 << 4)
+	#define FM25G01B_STATUS_ECC_1_3_BITFLIPS	(1 << 4)
+	#define FM25G01B_STATUS_ECC_4_BITFLIPS		(2 << 4)
+	#define FM25G01B_STATUS_ECC_5_BITFLIPS		(3 << 4)
+	#define FM25G01B_STATUS_ECC_6_BITFLIPS		(4 << 4)
+	#define FM25G01B_STATUS_ECC_7_BITFLIPS		(5 << 4)
+	#define FM25G01B_STATUS_ECC_8_BITFLIPS		(6 << 4)
+	#define FM25G01B_STATUS_ECC_UNCOR_ERROR		(7 << 4)
+
 #define FM25S01BI3_STATUS_ECC_MASK		(7 << 4)
 	#define FM25S01BI3_STATUS_ECC_NO_BITFLIPS	(0 << 4)
 	#define FM25S01BI3_STATUS_ECC_1_3_BITFLIPS	(1 << 4)
@@ -34,6 +44,72 @@ static SPINAND_OP_VARIANTS(update_cache_variants,
 		SPINAND_PROG_LOAD_1S_1S_4S_OP(false, 0, NULL, 0),
 		SPINAND_PROG_LOAD_1S_1S_1S_OP(false, 0, NULL, 0));
 
+
+static int fm25g01b_ooblayout_ecc(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *region)
+{
+	if (section)
+		return -ERANGE;
+
+	region->offset = 64;
+	region->length = 64;
+
+	return 0;
+}
+
+static int fm25g01b_ooblayout_free(struct mtd_info *mtd, int section,
+				   struct mtd_oob_region *region)
+{
+	if (section > 3)
+		return -ERANGE;
+
+	if (section == 0) {
+		/* reserve 2 bytes for the BBM */
+		region->offset = 2;
+		region->length = 14;
+	} else {
+		region->offset = section * 16;
+		region->length = 16;
+	}
+
+	return 0;
+}
+
+static int fm25g01b_ecc_get_status(struct spinand_device *spinand,
+				   u8 status)
+{
+	switch (status & FM25S01BI3_STATUS_ECC_MASK) {
+	case FM25G01B_STATUS_ECC_NO_BITFLIPS:
+		return 0;
+
+	case FM25G01B_STATUS_ECC_1_3_BITFLIPS:
+		return 3;
+
+	case FM25G01B_STATUS_ECC_4_BITFLIPS:
+		return 4;
+
+	case FM25G01B_STATUS_ECC_5_BITFLIPS:
+		return 5;
+
+	case FM25G01B_STATUS_ECC_6_BITFLIPS:
+		return 6;
+
+	case FM25G01B_STATUS_ECC_7_BITFLIPS:
+		return 7;
+
+	case FM25G01B_STATUS_ECC_8_BITFLIPS:
+		return 8;
+
+	case FM25G01B_STATUS_ECC_UNCOR_ERROR:
+		return -EBADMSG;
+
+	default:
+		break;
+	}
+
+	return -EINVAL;
+}
+
 static int fm25s01a_ooblayout_ecc(struct mtd_info *mtd, int section,
 				  struct mtd_oob_region *region)
 {
@@ -102,6 +178,11 @@ static int fm25s01bi3_ooblayout_free(struct mtd_info *mtd, int section,
 	return 0;
 }
 
+static const struct mtd_ooblayout_ops fm25g01b_ooblayout = {
+	.ecc = fm25g01b_ooblayout_ecc,
+	.free = fm25g01b_ooblayout_free,
+};
+
 static const struct mtd_ooblayout_ops fm25s01a_ooblayout = {
 	.ecc = fm25s01a_ooblayout_ecc,
 	.free = fm25s01a_ooblayout_free,
@@ -113,6 +194,26 @@ static const struct mtd_ooblayout_ops fm25s01bi3_ooblayout = {
 };
 
 static const struct spinand_info fmsh_spinand_table[] = {
+	SPINAND_INFO("FM25G01B",
+		     SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0xd1),
+		     NAND_MEMORG(1, 2048, 128, 64, 2048, 20, 1, 1, 1),
+		     NAND_ECCREQ(8, 528),
+		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
+					      &write_cache_variants,
+					      &update_cache_variants),
+		     SPINAND_HAS_QE_BIT,
+		     SPINAND_ECCINFO(&fm25g01b_ooblayout,
+				     fm25g01b_ecc_get_status)),
+	SPINAND_INFO("FM25G02B",
+		     SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0xd2),
+		     NAND_MEMORG(1, 2048, 128, 64, 2048, 41, 1, 1, 1),
+		     NAND_ECCREQ(8, 528),
+		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
+					      &write_cache_variants,
+					      &update_cache_variants),
+		     SPINAND_HAS_QE_BIT,
+		     SPINAND_ECCINFO(&fm25g01b_ooblayout,
+				     fm25g01b_ecc_get_status)),
 	SPINAND_INFO("FM25S01A",
 		     SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0xE4),
 		     NAND_MEMORG(1, 2048, 64, 64, 1024, 20, 1, 1, 1),
-- 
2.40.1