From: Zach Brown <zach.brown@ni.com>
To: <dwmw2@infradead.org>
Cc: <computersforpeace@gmail.com>,
<boris.brezillon@free-electrons.com>, <richard@nod.at>,
<dedekind1@gmail.com>, <linux-mtd@lists.infradead.org>,
<linux-kernel@vger.kernel.org>
Subject: [PATCH v4 4/5] mtd: nand: implement 'max_bad_blocks' mtd function
Date: Tue, 1 Nov 2016 13:16:29 -0500 [thread overview]
Message-ID: <1478024190-13713-5-git-send-email-zach.brown@ni.com> (raw)
In-Reply-To: <1478024190-13713-1-git-send-email-zach.brown@ni.com>
Implement the new mtd function 'max_bad_blocks'. Using the chip's
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>
---
drivers/mtd/nand/nand_base.c | 35 +++++++++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 3bde96a..be48e37 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -3236,6 +3236,40 @@ 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);
+ uint32_t part_start_block;
+ uint32_t part_end_block;
+ uint32_t part_start_lun;
+ uint32_t part_end_lun;
+
+ /* bb_per_lun and blocks_per_lun used to determine
+ * the maximum bad block count.
+ */
+ if (!chip->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_lun = part_start_block / chip->blocks_per_die;
+ part_end_lun = 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->bb_per_die * (part_end_lun - part_start_lun + 1);
+}
+
+/**
* nand_onfi_set_features- [REPLACEABLE] set features for ONFI nand
* @mtd: MTD device structure
* @chip: nand chip info structure
@@ -4767,6 +4801,7 @@ 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;
/*
--
2.7.4
next prev parent reply other threads:[~2016-11-01 18:17 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-01 18:16 [PATCH v4 0/5] mtd: use ONFI bad blocks per LUN to calculate UBI bad PEB limit Zach Brown
2016-11-01 18:16 ` [PATCH v4 1/5] mtd: introduce function max_bad_blocks Zach Brown
2016-11-01 18:16 ` [PATCH v4 2/5] mtd: ubi: use 'max_bad_blocks' to compute bad_peb_limit if available Zach Brown
2016-11-01 18:16 ` [PATCH v4 3/5] mtd: nand: Add bb_per_die and blocks_per_die fields to nand_chip Zach Brown
2016-11-06 17:49 ` Boris Brezillon
2016-11-01 18:16 ` Zach Brown [this message]
2016-11-01 18:16 ` [PATCH v4 5/5] mtd: nand: set bb_per_die and blocks_per_die for ONFI compliant chips Zach Brown
2016-11-06 17:51 ` [PATCH v4 0/5] mtd: use ONFI bad blocks per LUN to calculate UBI bad PEB limit Boris Brezillon
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