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mtd: nand: add ->badblockbits for minimum number of set bits in bad block byte 

This can be used to protect against bitflips in that field, but now mostly
for smartmedia.

Signed-off-by: Maxim Levitsky <maximlevitsky@gmail.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
hifive-unleashed-5.1
Maxim Levitsky 2010-02-22 20:39:38 +02:00 committed by David Woodhouse
parent b64d39d8b0
commit e0b58d0a70
2 changed files with 10 additions and 4 deletions
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13
drivers/mtd/nand/nand_base.c
View File

@ -364,14 +364,18 @@ static int nand_block_bad(struct mtd_info *mtd, loff_t ofs, int getchip)
bad = cpu_to_le16(chip->read_word(mtd));
if (chip->badblockpos & 0x1)
bad >>= 8;
if ((bad & 0xFF) != 0xff)
res = 1;
else
bad &= 0xFF;
} else {
chip->cmdfunc(mtd, NAND_CMD_READOOB, chip->badblockpos, page);
if (chip->read_byte(mtd) != 0xff)
res = 1;
bad = chip->read_byte(mtd);
}
if (likely(chip->badblockbits == 8))
res = bad != 0xFF;
else
res = hweight8(bad) < chip->badblockbits;
if (getchip)
nand_release_device(mtd);
@ -2884,6 +2888,7 @@ static struct nand_flash_dev *nand_get_flash_type(struct mtd_info *mtd,
/* Set the bad block position */
chip->badblockpos = mtd->writesize > 512 ?
NAND_LARGE_BADBLOCK_POS : NAND_SMALL_BADBLOCK_POS;
chip->badblockbits = 8;
/* Get chip options, preserve non chip based options */
chip->options &= ~NAND_CHIPOPTIONS_MSK;

1
include/linux/mtd/nand.h
View File

@ -401,6 +401,7 @@ struct nand_chip {
int subpagesize;
uint8_t cellinfo;
int badblockpos;
int badblockbits;
flstate_t state;