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| author | KOBAYASHI Yoshitake <yoshitake.kobayashi@toshiba.co.jp> | 2018-02-15 00:35:06 +0900 |
|---|---|---|
| committer | Boris Brezillon <boris.brezillon@bootlin.com> | 2018-02-14 20:28:29 +0100 |
| commit | fb3bff5b407e58493fa6bc44f24217f649aecd25 (patch) | |
| tree | c31995cdf69d007909dc198c6ad0449c420a10ef /drivers/mtd | |
| parent | 1b8c90985f59ccd8a1adb723b58b42628b36e668 (diff) | |
| download | op-kernel-dev-fb3bff5b407e58493fa6bc44f24217f649aecd25.zip op-kernel-dev-fb3bff5b407e58493fa6bc44f24217f649aecd25.tar.gz | |
mtd: nand: toshiba: Retrieve ECC requirements from extended ID
This patch enables support to read the ECC strength and size from the
NAND flash using Toshiba Memory SLC NAND extended-ID. This patch is
based on the information of the 6th ID byte of the Toshiba Memory SLC
NAND.
Signed-off-by: KOBAYASHI Yoshitake <yoshitake.kobayashi@toshiba.co.jp>
Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/nand/nand_toshiba.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/mtd/nand/nand_toshiba.c b/drivers/mtd/nand/nand_toshiba.c index 57df857..ab43f02 100644 --- a/drivers/mtd/nand/nand_toshiba.c +++ b/drivers/mtd/nand/nand_toshiba.c @@ -35,6 +35,32 @@ static void toshiba_nand_decode_id(struct nand_chip *chip) (chip->id.data[5] & 0x7) == 0x6 /* 24nm */ && !(chip->id.data[4] & 0x80) /* !BENAND */) mtd->oobsize = 32 * mtd->writesize >> 9; + + /* + * Extract ECC requirements from 6th id byte. + * For Toshiba SLC, ecc requrements are as follows: + * - 43nm: 1 bit ECC for each 512Byte is required. + * - 32nm: 4 bit ECC for each 512Byte is required. + * - 24nm: 8 bit ECC for each 512Byte is required. + */ + if (chip->id.len >= 6 && nand_is_slc(chip)) { + chip->ecc_step_ds = 512; + switch (chip->id.data[5] & 0x7) { + case 0x4: + chip->ecc_strength_ds = 1; + break; + case 0x5: + chip->ecc_strength_ds = 4; + break; + case 0x6: + chip->ecc_strength_ds = 8; + break; + default: + WARN(1, "Could not get ECC info"); + chip->ecc_step_ds = 0; + break; + } + } } static int toshiba_nand_init(struct nand_chip *chip) |
