mtd: nand: implement 'max_bad_blocks' mtd function

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Gitweb:     http://git.infradead.org/?p=mtd-2.6.git;a=commit;h=5671842fced7aee1550194f743947953a2f8a27c
Commit:     5671842fced7aee1550194f743947953a2f8a27c
Parent:     ceb374eb06848212e47fb884964a3ae5e79615b5
Author:     Zach Brown <zach.brown at ni.com>
AuthorDate: Tue Jan 10 13:30:20 2017 -0600
Committer:  Brian Norris <computersforpeace at gmail.com>
CommitDate: Wed Feb 8 14:19:43 2017 -0800

    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 at ni.com>
    Signed-off-by: Zach Brown <zach.brown at ni.com>
    Acked-by: Boris Brezillon <boris.brezillon at free-electron.com>
    Acked-by: Brian Norris <computersforpeace at gmail.com>
    Signed-off-by: Brian Norris <computersforpeace at gmail.com>
---
 drivers/mtd/nand/nand_base.c | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index ec1c28a..522baa9 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;
 
 	/*