[MTD] OneNAND: Single bit error detection
Idea from Jarkko Lavinen Signed-off-by: Jarkko Lavinen <jarkko.lavinen@nokia.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
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@ -331,9 +331,12 @@ static int onenand_wait(struct mtd_info *mtd, int state)
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if (interrupt & ONENAND_INT_READ) {
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ecc = this->read_word(this->base + ONENAND_REG_ECC_STATUS);
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if (ecc & ONENAND_ECC_2BIT_ALL) {
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if (ecc) {
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DEBUG(MTD_DEBUG_LEVEL0, "onenand_wait: ECC error = 0x%04x\n", ecc);
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return -EBADMSG;
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if (ecc & ONENAND_ECC_2BIT_ALL)
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mtd->ecc_stats.failed++;
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else if (ecc & ONENAND_ECC_1BIT_ALL)
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mtd->ecc_stats.corrected++;
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}
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}
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@ -715,6 +718,7 @@ static int onenand_read(struct mtd_info *mtd, loff_t from, size_t len,
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size_t *retlen, u_char *buf)
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{
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struct onenand_chip *this = mtd->priv;
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struct mtd_ecc_stats stats;
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int read = 0, column;
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int thislen;
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int ret = 0;
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@ -733,6 +737,7 @@ static int onenand_read(struct mtd_info *mtd, loff_t from, size_t len,
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/* TODO handling oob */
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stats = mtd->ecc_stats;
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while (read < len) {
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thislen = min_t(int, mtd->writesize, len - read);
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@ -774,7 +779,11 @@ out:
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* retlen == desired len and result == -EBADMSG
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*/
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*retlen = read;
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return ret;
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if (mtd->ecc_stats.failed - stats.failed)
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return -EBADMSG;
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return mtd->ecc_stats.corrected - stats.corrected ? -EUCLEAN : 0;
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}
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/**
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@ -1390,7 +1399,6 @@ static int onenand_lock(struct mtd_info *mtd, loff_t ofs, size_t len)
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return onenand_do_lock_cmd(mtd, ofs, len, ONENAND_CMD_LOCK);
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}
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/**
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* onenand_unlock - [MTD Interface] Unlock block(s)
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* @param mtd MTD device structure
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@ -100,6 +100,7 @@ static int create_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr
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bbm->bbt[i >> 3] |= 0x03 << (i & 0x6);
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printk(KERN_WARNING "Bad eraseblock %d at 0x%08x\n",
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i >> 1, (unsigned int) from);
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mtd->ecc_stats.badblocks++;
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break;
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}
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}
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@ -179,6 +179,7 @@
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* ECC Status Reigser FF00h (R)
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*/
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#define ONENAND_ECC_1BIT (1 << 0)
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#define ONENAND_ECC_1BIT_ALL (0x5555)
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#define ONENAND_ECC_2BIT (1 << 1)
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#define ONENAND_ECC_2BIT_ALL (0xAAAA)
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