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mtd: nand: toshiba: Retrieve ECC requirements from extended ID

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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>
This commit is contained in:
KOBAYASHI Yoshitake 2018-02-15 00:35:06 +09:00 committed by Boris Brezillon
parent 1b8c90985f
commit fb3bff5b40
1 changed files with 26 additions and 0 deletions
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26
drivers/mtd/nand/nand_toshiba.c
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@ -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)