[RFC 41/47] mtd: nand: stm_nand_bch: MTD mark and check for bad blocks (BCH)

Lee Jones
2014-03-25T08:21:59Z

Use the local BBM helpers to check for and mark bad blocks.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
---
drivers/mtd/nand/stm_nand_bch.c | 51 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 51 insertions(+)

diff --git a/drivers/mtd/nand/stm_nand_bch.c b/drivers/mtd/nand/stm_nand_bch.c
index 55f4a4c..38658b8 100644
--- a/drivers/mtd/nand/stm_nand_bch.c
+++ b/drivers/mtd/nand/stm_nand_bch.c
@@ -1218,6 +1218,55 @@ static int flex_do_write_ops(struct nandi_controller *nandi,
return 0;
}

+static int bch_mtd_block_isbad(struct mtd_info *mtd, loff_t offs)
+{
+ struct nand_chip *chip = mtd->priv;
+ struct nandi_controller *nandi = chip->priv;
+
+ uint32_t block;
+
+ /* Check for invalid offset */
+ if (offs > mtd->size)
+ return -EINVAL;
+
+ block = offs >> nandi->block_shift;
+
+ /* Protect blocks reserved for BBTs */
+ if (block >= (nandi->blocks_per_device - NAND_IBBT_NBLOCKS))
+ return 1;
+
+ return bbt_is_block_bad(nandi->info.bbt_info.bbt, block);
+}
+
+static int bch_mtd_block_markbad(struct mtd_info *mtd, loff_t offs)
+{
+ struct nand_chip *chip = mtd->priv;
+ struct nandi_controller *nandi = chip->priv;
+
+ uint32_t block;
+ int ret;
+
+ /* Is block already considered bad? (will also catch invalid offsets) */
+ ret = mtd_block_isbad(mtd, offs);
+ if (ret < 0)
+ return ret;
+ if (ret == 1)
+ return 0;
+
+ /* Mark bad */
+ block = offs >> nandi->block_shift;
+ bbt_set_block_mark(nandi->info.bbt_info.bbt, block, BBT_MARK_BAD_WEAR);
+
+ /* Update BBTs, incrementing bbt_vers */
+ nand_get_device(mtd, FL_WRITING);
+ ret = bch_update_bbts(nandi, &nandi->info.bbt_info,
+ NAND_IBBT_UPDATE_BOTH,
+ nandi->info.bbt_info.bbt_vers[0] + 1);
+ nand_release_device(mtd);
+
+ return ret;
+}
+
static int bch_mtd_erase(struct mtd_info *mtd, struct erase_info *instr)
{
struct nand_chip *chip = mtd->priv;
@@ -1405,6 +1454,8 @@ static void nandi_set_mtd_defaults(struct nandi_controller *nandi,
mtd->subpage_sft = 0;

mtd->_erase = bch_mtd_erase;
+ mtd->_block_isbad = bch_mtd_block_isbad;
+ mtd->_block_markbad = bch_mtd_block_markbad;

mtd->_point = NULL;
mtd->_unpoint = NULL;
--
1.8.3.2