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>
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@ -3262,6 +3262,42 @@ static int nand_block_markbad(struct mtd_info *mtd, loff_t ofs)
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return nand_block_markbad_lowlevel(mtd, ofs);
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}
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/**
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* nand_max_bad_blocks - [MTD Interface] Max number of bad blocks for an mtd
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* @mtd: MTD device structure
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* @ofs: offset relative to mtd start
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* @len: length of mtd
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*/
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static int nand_max_bad_blocks(struct mtd_info *mtd, loff_t ofs, size_t len)
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{
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struct nand_chip *chip = mtd_to_nand(mtd);
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u32 part_start_block;
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u32 part_end_block;
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u32 part_start_die;
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u32 part_end_die;
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/*
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* max_bb_per_die and blocks_per_die used to determine
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* the maximum bad block count.
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*/
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if (!chip->max_bb_per_die || !chip->blocks_per_die)
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return -ENOTSUPP;
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/* Get the start and end of the partition in erase blocks. */
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part_start_block = mtd_div_by_eb(ofs, mtd);
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part_end_block = mtd_div_by_eb(len, mtd) + part_start_block - 1;
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/* Get the start and end LUNs of the partition. */
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part_start_die = part_start_block / chip->blocks_per_die;
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part_end_die = part_end_block / chip->blocks_per_die;
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/*
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* Look up the bad blocks per unit and multiply by the number of units
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* that the partition spans.
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*/
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return chip->max_bb_per_die * (part_end_die - part_start_die + 1);
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}
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/**
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* nand_onfi_set_features- [REPLACEABLE] set features for ONFI nand
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* @mtd: MTD device structure
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@ -4815,6 +4851,7 @@ int nand_scan_tail(struct mtd_info *mtd)
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mtd->_block_isreserved = nand_block_isreserved;
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mtd->_block_isbad = nand_block_isbad;
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mtd->_block_markbad = nand_block_markbad;
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mtd->_max_bad_blocks = nand_max_bad_blocks;
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mtd->writebufsize = mtd->writesize;
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/*
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