diff options
author | Yoshio Furuyama <ytc-mb-yfuruyama7@kioxia.com> | 2020-03-25 17:22:52 +0900 |
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committer | Miquel Raynal <miquel.raynal@bootlin.com> | 2020-03-25 22:13:04 +0100 |
commit | fca88925d76978b7f20de42d8ead34fb91500003 (patch) | |
tree | 8025cb7ff9a78ed6f90dfe63f97fa747e74593c6 /drivers/mtd | |
parent | 798fcdd010006e87b3154d6454c657af7b033002 (diff) | |
download | linux-fca88925d76978b7f20de42d8ead34fb91500003.tar.bz2 |
mtd: rawnand: toshiba: Support reading the number of bitflips for BENAND (Built-in ECC NAND)
Add support vendor specific commands for KIOXIA CORPORATION BENAND.
The actual bitflips number can be retrieved by this command.
Signed-off-by: Yoshio Furuyama <ytc-mb-yfuruyama7@kioxia.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/1585124572-4693-1-git-send-email-ytc-mb-yfuruyama7@kioxia.com
Diffstat (limited to 'drivers/mtd')
-rw-r--r-- | drivers/mtd/nand/raw/nand_toshiba.c | 58 |
1 files changed, 56 insertions, 2 deletions
diff --git a/drivers/mtd/nand/raw/nand_toshiba.c b/drivers/mtd/nand/raw/nand_toshiba.c index 9c03fbb1f47d..f3dcd695b5db 100644 --- a/drivers/mtd/nand/raw/nand_toshiba.c +++ b/drivers/mtd/nand/raw/nand_toshiba.c @@ -14,14 +14,68 @@ /* Recommended to rewrite for BENAND */ #define TOSHIBA_NAND_STATUS_REWRITE_RECOMMENDED BIT(3) +/* ECC Status Read Command for BENAND */ +#define TOSHIBA_NAND_CMD_ECC_STATUS_READ 0x7A + +/* ECC Status Mask for BENAND */ +#define TOSHIBA_NAND_ECC_STATUS_MASK 0x0F + +/* Uncorrectable Error for BENAND */ +#define TOSHIBA_NAND_ECC_STATUS_UNCORR 0x0F + +/* Max ECC Steps for BENAND */ +#define TOSHIBA_NAND_MAX_ECC_STEPS 8 + +static int toshiba_nand_benand_read_eccstatus_op(struct nand_chip *chip, + u8 *buf) +{ + u8 *ecc_status = buf; + + if (nand_has_exec_op(chip)) { + const struct nand_sdr_timings *sdr = + nand_get_sdr_timings(&chip->data_interface); + struct nand_op_instr instrs[] = { + NAND_OP_CMD(TOSHIBA_NAND_CMD_ECC_STATUS_READ, + PSEC_TO_NSEC(sdr->tADL_min)), + NAND_OP_8BIT_DATA_IN(chip->ecc.steps, ecc_status, 0), + }; + struct nand_operation op = NAND_OPERATION(chip->cur_cs, instrs); + + return nand_exec_op(chip, &op); + } + + return -ENOTSUPP; +} + static int toshiba_nand_benand_eccstatus(struct nand_chip *chip) { struct mtd_info *mtd = nand_to_mtd(chip); int ret; unsigned int max_bitflips = 0; - u8 status; + u8 status, ecc_status[TOSHIBA_NAND_MAX_ECC_STEPS]; /* Check Status */ + ret = toshiba_nand_benand_read_eccstatus_op(chip, ecc_status); + if (!ret) { + unsigned int i, bitflips = 0; + + for (i = 0; i < chip->ecc.steps; i++) { + bitflips = ecc_status[i] & TOSHIBA_NAND_ECC_STATUS_MASK; + if (bitflips == TOSHIBA_NAND_ECC_STATUS_UNCORR) { + mtd->ecc_stats.failed++; + } else { + mtd->ecc_stats.corrected += bitflips; + max_bitflips = max(max_bitflips, bitflips); + } + } + + return max_bitflips; + } + + /* + * Fallback to regular status check if + * toshiba_nand_benand_read_eccstatus_op() failed. + */ ret = nand_status_op(chip, &status); if (ret) return ret; @@ -108,7 +162,7 @@ static void toshiba_nand_decode_id(struct nand_chip *chip) */ if (chip->id.len >= 6 && nand_is_slc(chip) && (chip->id.data[5] & 0x7) == 0x6 /* 24nm */ && - !(chip->id.data[4] & 0x80) /* !BENAND */) { + !(chip->id.data[4] & TOSHIBA_NAND_ID4_IS_BENAND) /* !BENAND */) { memorg->oobsize = 32 * memorg->pagesize >> 9; mtd->oobsize = memorg->oobsize; } |