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authorZach Brown <zach.brown@ni.com>2017-01-10 13:30:20 -0600
committerBrian Norris <computersforpeace@gmail.com>2017-02-08 14:19:43 -0800
commit5671842fced7aee1550194f743947953a2f8a27c (patch)
tree4cce0d1e4d5648b2363ab9c96c6c26bf7f1d1377 /drivers/mtd
parentceb374eb06848212e47fb884964a3ae5e79615b5 (diff)
downloadlinux-5671842fced7aee1550194f743947953a2f8a27c.tar.bz2
mtd: nand: implement 'max_bad_blocks' mtd function
Implement the new mtd function 'max_bad_blocks'. Using the chip's max_bb_per_die and blocks_per_die fields to determine the maximum bad blocks to reserve for an MTD. Signed-off-by: Jeff Westfahl <jeff.westfahl@ni.com> Signed-off-by: Zach Brown <zach.brown@ni.com> Acked-by: Boris Brezillon <boris.brezillon@free-electron.com> Acked-by: Brian Norris <computersforpeace@gmail.com> Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/nand/nand_base.c37
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;
/*