[PATCH v2] mtd: spinand: Add support for GigaDevice GD5F1GQ4UExxG

[Stefan Roese <sr@xxxxxxx>]

Add support for GigaDevice GD5F1GQ4UExxG SPI NAND chip.

Signed-off-by: Stefan Roese <sr@xxxxxxx>
Cc: Chuanhong Guo <gch981213@xxxxxxxxx>
Cc: Frieder Schrempf <frieder.schrempf@xxxxxxxxxx>
Cc: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
Cc: Boris Brezillon <bbrezillon@xxxxxxxxxx>
---
v2:
- Name of NAND device changed to better reflect the real part
- OOB layout changed to only reserve 1 byte for BBT
- Use ECC caps 8bits/512bytes instead of 8bits/2048bytes
- Enhanced ecc_get_status() function to determine and report
  a more fine grained bit error status

 drivers/mtd/nand/spi/gigadevice.c | 83 +++++++++++++++++++++++++++++++
 1 file changed, 83 insertions(+)

diff --git a/drivers/mtd/nand/spi/gigadevice.c b/drivers/mtd/nand/spi/gigadevice.c
index e4141c20947a..0b49d8264bef 100644
--- a/drivers/mtd/nand/spi/gigadevice.c
+++ b/drivers/mtd/nand/spi/gigadevice.c
@@ -12,6 +12,8 @@
 #define GD5FXGQ4XA_STATUS_ECC_1_7_BITFLIPS	(1 << 4)
 #define GD5FXGQ4XA_STATUS_ECC_8_BITFLIPS	(3 << 4)
 
+#define GD5FXGQ4UEXXG_REG_STATUS2		0xf0
+
 static SPINAND_OP_VARIANTS(read_cache_variants,
 		SPINAND_PAGE_READ_FROM_CACHE_QUADIO_OP(0, 2, NULL, 0),
 		SPINAND_PAGE_READ_FROM_CACHE_X4_OP(0, 1, NULL, 0),
@@ -81,11 +83,83 @@ static int gd5fxgq4xa_ecc_get_status(struct spinand_device *spinand,
 	return -EINVAL;
 }
 
+static int gd5fxgq4uexxg_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 gd5fxgq4uexxg_ooblayout_free(struct mtd_info *mtd, int section,
+					struct mtd_oob_region *region)
+{
+	if (section)
+		return -ERANGE;
+
+	/* Reserve 1 bytes for the BBM. */
+	region->offset = 1;
+	region->length = 63;
+
+	return 0;
+}
+
+static int gd5fxgq4uexxg_ecc_get_status(struct spinand_device *spinand,
+					u8 status)
+{
+	u8 status2;
+	struct spi_mem_op op = SPINAND_GET_FEATURE_OP(GD5FXGQ4UEXXG_REG_STATUS2,
+						      &status2);
+	int ret;
+
+	switch (status & STATUS_ECC_MASK) {
+	case STATUS_ECC_NO_BITFLIPS:
+		return 0;
+
+	case GD5FXGQ4XA_STATUS_ECC_1_7_BITFLIPS:
+		/*
+		 * Read status2 register to determine a more fine grained
+		 * bit error status
+		 */
+		ret = spi_mem_exec_op(spinand->spimem, &op);
+		if (ret)
+			return ret;
+
+		/*
+		 * 4 ... 7 bits are flipped (1..4 can't be detected, so
+		 * report the maximum of 4 in this case
+		 */
+		/* bits sorted this way (3...0): ECCS1,ECCS0,ECCSE1,ECCSE0 */
+		return ((status & STATUS_ECC_MASK) >> 2) |
+			((status2 & STATUS_ECC_MASK) >> 4);
+
+	case GD5FXGQ4XA_STATUS_ECC_8_BITFLIPS:
+		return 8;
+
+	case STATUS_ECC_UNCOR_ERROR:
+		return -EBADMSG;
+
+	default:
+		break;
+	}
+
+	return -EINVAL;
+}
+
 static const struct mtd_ooblayout_ops gd5fxgq4xa_ooblayout = {
 	.ecc = gd5fxgq4xa_ooblayout_ecc,
 	.free = gd5fxgq4xa_ooblayout_free,
 };
 
+static const struct mtd_ooblayout_ops gd5fxgq4uexxg_ooblayout = {
+	.ecc = gd5fxgq4uexxg_ooblayout_ecc,
+	.free = gd5fxgq4uexxg_ooblayout_free,
+};
+
 static const struct spinand_info gigadevice_spinand_table[] = {
 	SPINAND_INFO("GD5F1GQ4xA", 0xF1,
 		     NAND_MEMORG(1, 2048, 64, 64, 1024, 1, 1, 1),
@@ -114,6 +188,15 @@ static const struct spinand_info gigadevice_spinand_table[] = {
 		     0,
 		     SPINAND_ECCINFO(&gd5fxgq4xa_ooblayout,
 				     gd5fxgq4xa_ecc_get_status)),
+	SPINAND_INFO("GD5F1GQ4UExxG", 0xd1,
+		     NAND_MEMORG(1, 2048, 128, 64, 1024, 1, 1, 1),
+		     NAND_ECCREQ(8, 512),
+		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
+					      &write_cache_variants,
+					      &update_cache_variants),
+		     0,
+		     SPINAND_ECCINFO(&gd5fxgq4uexxg_ooblayout,
+				     gd5fxgq4uexxg_ecc_get_status)),
 };
 
 static int gigadevice_spinand_detect(struct spinand_device *spinand)
-- 
2.20.1


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