Commit 5671842f authored by Zach Brown's avatar Zach Brown Committed by Brian Norris
Browse files

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: default avatarJeff Westfahl <jeff.westfahl@ni.com>
Signed-off-by: default avatarZach Brown <zach.brown@ni.com>
Acked-by: default avatarBoris Brezillon <boris.brezillon@free-electron.com>
Acked-by: default avatarBrian Norris <computersforpeace@gmail.com>
Signed-off-by: default avatarBrian Norris <computersforpeace@gmail.com>
parent ceb374eb

drivers/mtd/nand/nand_base.c

+37 −0
Original line number Diff line number Diff line
@@ -3262,6 +3262,42 @@ static int nand_block_markbad(struct mtd_info *mtd, loff_t ofs) 
	return nand_block_markbad_lowlevel(mtd, 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
@@ -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;



	/*

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