diff options
| author | Boris Brezillon <bbrezillon@kernel.org> | 2018-11-04 14:43:37 +0100 |
|---|---|---|
| committer | Miquel Raynal <miquel.raynal@bootlin.com> | 2019-04-08 10:21:08 +0200 |
| commit | 377e517b5fa53590418a7b4c2206082d92434fa3 (patch) | |
| tree | 04b56af9accf4b06573fa8e3f6267cf3283768e9 /drivers/mtd/nand/core.c | |
| parent | d090c25028e9df186bb0d31379f7d5605c57fa79 (diff) | |
mtd: nand: Add max_bad_eraseblocks_per_lun info to memorg
NAND datasheets usually give the maximum number of bad blocks per LUN
and this number can be used to help upper layers decide how much blocks
they should reserve for bad block handling.
Add a max_bad_eraseblocks_per_lun to the nand_memory_organization
struct and update the NAND_MEMORG() macro (and its users) accordingly.
We also provide a default mtd->_max_bad_blocks() implementation.
Signed-off-by: Boris Brezillon <bbrezillon@kernel.org>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Diffstat (limited to 'drivers/mtd/nand/core.c')
| -rw-r--r-- | drivers/mtd/nand/core.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/mtd/nand/core.c b/drivers/mtd/nand/core.c index 9c9f8936b63b..b6de955ac8bf 100644 --- a/drivers/mtd/nand/core.c +++ b/drivers/mtd/nand/core.c @@ -174,6 +174,40 @@ int nanddev_mtd_erase(struct mtd_info *mtd, struct erase_info *einfo) EXPORT_SYMBOL_GPL(nanddev_mtd_erase); /** + * nanddev_mtd_max_bad_blocks() - Get the maximum number of bad eraseblock on + * a specific region of the NAND device + * @mtd: MTD device + * @offs: offset of the NAND region + * @len: length of the NAND region + * + * Default implementation for mtd->_max_bad_blocks(). Only works if + * nand->memorg.max_bad_eraseblocks_per_lun is > 0. + * + * Return: a positive number encoding the maximum number of eraseblocks on a + * portion of memory, a negative error code otherwise. + */ +int nanddev_mtd_max_bad_blocks(struct mtd_info *mtd, loff_t offs, size_t len) +{ + struct nand_device *nand = mtd_to_nanddev(mtd); + struct nand_pos pos, end; + unsigned int max_bb = 0; + + if (!nand->memorg.max_bad_eraseblocks_per_lun) + return -ENOTSUPP; + + nanddev_offs_to_pos(nand, offs, &pos); + nanddev_offs_to_pos(nand, offs + len, &end); + + for (nanddev_offs_to_pos(nand, offs, &pos); + nanddev_pos_cmp(&pos, &end) < 0; + nanddev_pos_next_lun(nand, &pos)) + max_bb += nand->memorg.max_bad_eraseblocks_per_lun; + + return max_bb; +} +EXPORT_SYMBOL_GPL(nanddev_mtd_max_bad_blocks); + +/** * nanddev_init() - Initialize a NAND device * @nand: NAND device * @ops: NAND device operations |