Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758288AbcK3Q65 (ORCPT ); Wed, 30 Nov 2016 11:58:57 -0500 Received: from skprod3.natinst.com ([130.164.80.24]:46538 "EHLO ni.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1758182AbcK3Q62 (ORCPT ); Wed, 30 Nov 2016 11:58:28 -0500 From: Zach Brown To: CC: , , , , , Subject: [PATCH v6 4/5] mtd: nand: implement 'max_bad_blocks' mtd function Date: Wed, 30 Nov 2016 10:57:30 -0600 Message-ID: <1480525051-4991-5-git-send-email-zach.brown@ni.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1480525051-4991-1-git-send-email-zach.brown@ni.com> References: <1480525051-4991-1-git-send-email-zach.brown@ni.com> MIME-Version: 1.0 Content-Type: text/plain X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2016-11-30_12:,, signatures=0 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 suspectscore=3 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1609300000 definitions=main-1611300273 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2332 Lines: 69 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 Signed-off-by: Zach Brown Acked-by: Boris Brezillon Acked-by: Brian Norris --- 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 3bde96a..b4a7c7f 100644 --- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -3236,6 +3236,42 @@ 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); + uint32_t part_start_block; + uint32_t part_end_block; + uint32_t part_start_die; + uint32_t 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 @@ -4767,6 +4803,7 @@ 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