[PATCH v3 2/2] mtd: rawnand: Add timings for Kioxia TH58NVG2S3HBAI4

[Rickard Andersson <rickaran@axis.com>]

From: Rickard x Andersson <rickaran@axis.com>

The Kioxia/Toshiba TH58NVG2S3HBAI4 NAND memory is not a
ONFI compliant memory. The timings of the memory is quite
close to ONFI mode 4 but is breaking that spec.

Erase block read speed is increased from 6910 KiB/s to
13490 KiB/s. Erase block write speed is increased from
3350 KiB/s to 4410 KiB/s.

Tested on IMX6SX which has a NAND controller supporting
EDO mode.

Signed-off-by: Rickard x Andersson <rickaran@axis.com>
---
 drivers/mtd/nand/raw/nand_ids.c     |  3 +++
 drivers/mtd/nand/raw/nand_toshiba.c | 44 +++++++++++++++++++++++++++++++++++++
 2 files changed, 47 insertions(+)

diff --git a/drivers/mtd/nand/raw/nand_ids.c b/drivers/mtd/nand/raw/nand_ids.c
index e0dbc2e316c7..8b676e8b481b 100644
--- a/drivers/mtd/nand/raw/nand_ids.c
+++ b/drivers/mtd/nand/raw/nand_ids.c
@@ -52,6 +52,9 @@ struct nand_flash_dev nand_flash_ids[] = {
 		{ .id = {0xad, 0xde, 0x94, 0xda, 0x74, 0xc4} },
 		  SZ_8K, SZ_8K, SZ_2M, NAND_NEED_SCRAMBLING, 6, 640,
 		  NAND_ECC_INFO(40, SZ_1K), 4 },
+	{"TH58NVG2S3HBAI4 4G 3.3V 8-bit",
+		{ .id = {0x98, 0xdc, 0x91, 0x15, 0x76} },
+		  SZ_2K, SZ_512, SZ_128K, 0, 5, 128, NAND_ECC_INFO(8, SZ_512) },
 
 	LEGACY_ID_NAND("NAND 4MiB 5V 8-bit",   0x6B, 4, SZ_8K, SP_OPTIONS),
 	LEGACY_ID_NAND("NAND 4MiB 3,3V 8-bit", 0xE3, 4, SZ_8K, SP_OPTIONS),
diff --git a/drivers/mtd/nand/raw/nand_toshiba.c b/drivers/mtd/nand/raw/nand_toshiba.c
index b6efaf5195bb..bea6bd1beece 100644
--- a/drivers/mtd/nand/raw/nand_toshiba.c
+++ b/drivers/mtd/nand/raw/nand_toshiba.c
@@ -194,6 +194,42 @@ static void toshiba_nand_decode_id(struct nand_chip *chip)
 	}
 }
 
+static int th58nvg2s3hbai4_choose_data_interface(struct nand_chip *chip)
+{
+	int ret;
+	struct nand_sdr_timings *timings = &chip->data_interface.timings.sdr;
+
+	/* Start with timings from the closest timing mode, mode 4. */
+	ret = onfi_fill_data_interface(chip, NAND_SDR_IFACE, 4);
+	if (ret)
+		return ret;
+
+	/* Patch timings that differ from mode 4. */
+	timings->tALS_min = 12000;
+	timings->tCHZ_max = 20000;
+	timings->tCLS_min = 12000;
+	timings->tCOH_min = 0;
+	timings->tDS_min = 12000;
+	timings->tRHOH_min = 25000;
+	timings->tRHW_min = 30000;
+	timings->tRHZ_max = 60000;
+	timings->tWHR_min = 60000;
+
+	/* Patch timings not part of onfi timing mode. */
+	timings->tPROG_max = 700000000;
+	timings->tBERS_max = 5000000000;
+
+	/*
+	 * Find the corresponding onfi timing mode that is safe to use. This
+	 * will only be used if the controller does not handle the specific
+	 * timings that were provided.
+	 */
+	chip->data_interface.timings.mode =
+		onfi_find_equivalent_sdr_mode(timings);
+
+	return ret;
+}
+
 static int tc58teg5dclta00_init(struct nand_chip *chip)
 {
 	struct mtd_info *mtd = nand_to_mtd(chip);
@@ -205,6 +241,12 @@ static int tc58teg5dclta00_init(struct nand_chip *chip)
 	return 0;
 }
 
+static int th58nvg2s3hbai4_init(struct nand_chip *chip)
+{
+	chip->ops.choose_data_interface = th58nvg2s3hbai4_choose_data_interface;
+	return 0;
+}
+
 static int toshiba_nand_init(struct nand_chip *chip)
 {
 	if (nand_is_slc(chip))
@@ -217,6 +259,8 @@ static int toshiba_nand_init(struct nand_chip *chip)
 
 	if (!strcmp("TC58TEG5DCLTA00", chip->parameters.model))
 		tc58teg5dclta00_init(chip);
+	if (!strncmp("TH58NVG2S3HBAI4", chip->parameters.model, 15))
+		th58nvg2s3hbai4_init(chip);
 
 	return 0;
 }
-- 
2.11.0


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