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[MTD] OneNAND: Single bit error detection

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Idea from Jarkko Lavinen

Signed-off-by: Jarkko Lavinen <jarkko.lavinen@nokia.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
This commit is contained in:
Kyungmin Park 2006-11-16 12:03:56 +09:00
parent 08f782b60a
commit f4f91ac3c8
3 changed files with 15 additions and 5 deletions
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18
drivers/mtd/onenand/onenand_base.c
View File

@ -331,9 +331,12 @@ static int onenand_wait(struct mtd_info *mtd, int state)
if (interrupt & ONENAND_INT_READ) {
ecc = this->read_word(this->base + ONENAND_REG_ECC_STATUS);
if (ecc & ONENAND_ECC_2BIT_ALL) {
if (ecc) {
DEBUG(MTD_DEBUG_LEVEL0, "onenand_wait: ECC error = 0x%04x\n", ecc);
return -EBADMSG;
if (ecc & ONENAND_ECC_2BIT_ALL)
mtd->ecc_stats.failed++;
else if (ecc & ONENAND_ECC_1BIT_ALL)
mtd->ecc_stats.corrected++;
}
}
@ -715,6 +718,7 @@ static int onenand_read(struct mtd_info *mtd, loff_t from, size_t len,
size_t *retlen, u_char *buf)
{
struct onenand_chip *this = mtd->priv;
struct mtd_ecc_stats stats;
int read = 0, column;
int thislen;
int ret = 0;
@ -733,6 +737,7 @@ static int onenand_read(struct mtd_info *mtd, loff_t from, size_t len,
/* TODO handling oob */
stats = mtd->ecc_stats;
while (read < len) {
thislen = min_t(int, mtd->writesize, len - read);
@ -774,7 +779,11 @@ out:
* retlen == desired len and result == -EBADMSG
*/
*retlen = read;
return ret;
if (mtd->ecc_stats.failed - stats.failed)
return -EBADMSG;
return mtd->ecc_stats.corrected - stats.corrected ? -EUCLEAN : 0;
}
/**
@ -1390,7 +1399,6 @@ static int onenand_lock(struct mtd_info *mtd, loff_t ofs, size_t len)
return onenand_do_lock_cmd(mtd, ofs, len, ONENAND_CMD_LOCK);
}
/**
* onenand_unlock - [MTD Interface] Unlock block(s)
* @param mtd MTD device structure
@ -1900,7 +1908,7 @@ static int onenand_probe(struct mtd_info *mtd)
/* Read manufacturer and device IDs from Register */
maf_id = this->read_word(this->base + ONENAND_REG_MANUFACTURER_ID);
dev_id = this->read_word(this->base + ONENAND_REG_DEVICE_ID);
ver_id= this->read_word(this->base + ONENAND_REG_VERSION_ID);
ver_id = this->read_word(this->base + ONENAND_REG_VERSION_ID);
/* Check OneNAND device */
if (maf_id != bram_maf_id || dev_id != bram_dev_id)

1
drivers/mtd/onenand/onenand_bbt.c
View File

@ -100,6 +100,7 @@ static int create_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr
bbm->bbt[i >> 3] |= 0x03 << (i & 0x6);
printk(KERN_WARNING "Bad eraseblock %d at 0x%08x\n",
i >> 1, (unsigned int) from);
mtd->ecc_stats.badblocks++;
break;
}
}

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

@ -179,6 +179,7 @@
* ECC Status Reigser FF00h (R)
*/
#define ONENAND_ECC_1BIT (1 << 0)
#define ONENAND_ECC_1BIT_ALL (0x5555)
#define ONENAND_ECC_2BIT (1 << 1)
#define ONENAND_ECC_2BIT_ALL (0xAAAA)