diff options
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/nand/nand_base.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c index ec1c28aaaf23..522baa9b6b5b 100644 --- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -3263,6 +3263,42 @@ static int nand_block_markbad(struct mtd_info *mtd, loff_t ofs) } /** + * nand_max_bad_blocks - [MTD Interface] Max number of bad blocks for an mtd + * @mtd: MTD device structure + * @ofs: offset relative to mtd start + * @len: length of mtd + */ +static int nand_max_bad_blocks(struct mtd_info *mtd, loff_t ofs, size_t len) +{ + struct nand_chip *chip = mtd_to_nand(mtd); + u32 part_start_block; + u32 part_end_block; + u32 part_start_die; + u32 part_end_die; + + /* + * max_bb_per_die and blocks_per_die used to determine + * the maximum bad block count. + */ + if (!chip->max_bb_per_die || !chip->blocks_per_die) + return -ENOTSUPP; + + /* Get the start and end of the partition in erase blocks. */ + part_start_block = mtd_div_by_eb(ofs, mtd); + part_end_block = mtd_div_by_eb(len, mtd) + part_start_block - 1; + + /* Get the start and end LUNs of the partition. */ + part_start_die = part_start_block / chip->blocks_per_die; + part_end_die = part_end_block / chip->blocks_per_die; + + /* + * Look up the bad blocks per unit and multiply by the number of units + * that the partition spans. + */ + return chip->max_bb_per_die * (part_end_die - part_start_die + 1); +} + +/** * nand_onfi_set_features- [REPLACEABLE] set features for ONFI nand * @mtd: MTD device structure * @chip: nand chip info structure @@ -4815,6 +4851,7 @@ int nand_scan_tail(struct mtd_info *mtd) mtd->_block_isreserved = nand_block_isreserved; mtd->_block_isbad = nand_block_isbad; mtd->_block_markbad = nand_block_markbad; + mtd->_max_bad_blocks = nand_max_bad_blocks; mtd->writebufsize = mtd->writesize; /* |
