From patchwork Tue Jul 7 06:02:52 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?UGV0ZXIgUGFuIOa9mOagiyAocGV0ZXJwYW5kb25nKQ==?= X-Patchwork-Id: 492066 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2001:1868:205::9]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id E3FC31402B6 for ; Tue, 7 Jul 2015 16:07:21 +1000 (AEST) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZCLyz-0001yi-FP; Tue, 07 Jul 2015 06:03:53 +0000 Received: from mailout.micron.com ([137.201.242.129]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZCLys-0001ga-QA; Tue, 07 Jul 2015 06:03:51 +0000 Received: from mail.micron.com (ntxboicas04.micron.com [137.201.20.214]) by mailout.micron.com (8.14.4/8.14.6) with ESMTP id t6762wBK025519 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Tue, 7 Jul 2015 00:02:59 -0600 Received: from NTXXIACAS02.xacn.micron.com (10.167.69.56) by NTXBOICAS04.micron.com (137.201.20.214) with Microsoft SMTP Server (TLS) id 14.3.224.2; Tue, 7 Jul 2015 00:02:58 -0600 Received: from NTXXIAMBX02.xacn.micron.com ([fe80::e19a:c3ed:119d:6971]) by NTXXIACAS02.xacn.micron.com ([::1]) with mapi id 14.03.0224.002; Tue, 7 Jul 2015 14:02:53 +0800 From: =?gb2312?B?UGV0ZXIgUGFuIMXLtrAgKHBldGVycGFuZG9uZyk=?= To: "dwmw2@infradead.org" , Brian Norris , "fransklaver@gmail.com" , "wsa@the-dreams.de" , "zajec5@gmail.com" , "boris.brezillon@free-electrons.com" , "baruch@tkos.co.il" , "ezequiel.garcia@free-electrons.com" , "kdasu.kdev@gmail.com" , "rogerq@ti.com" , "asierra@xes-inc.com" , bpqw Subject: [PATCH v2] mtd: nand_bbt: separate struct nand_chip from nand_bbt.c Thread-Topic: [PATCH v2] mtd: nand_bbt: separate struct nand_chip from nand_bbt.c Thread-Index: AdC4eelsL7zroqRkSh+TP7UHmkFNPw== Date: Tue, 7 Jul 2015 06:02:52 +0000 Message-ID: <87F60714EC601C4C83DFF1D2E3D390A03268E55C@NTXXIAMBX02.xacn.micron.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.167.84.5] X-TM-AS-Product-Ver: SMEX-11.0.0.4179-8.000.1202-21660.005 X-TM-AS-Result: No--15.544700-0.000000-31 X-TM-AS-User-Approved-Sender: Yes X-TM-AS-User-Blocked-Sender: No x-mt-checkinternalsenderrule: True MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.73 on 137.201.131.43 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150706_230347_019874_00749116 X-CRM114-Status: GOOD ( 15.98 ) X-Spam-Score: -4.9 (----) X-Spam-Report: SpamAssassin version 3.4.0 on bombadil.infradead.org summary: Content analysis details: (-4.9 points) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at http://www.dnswl.org/, medium trust [137.201.242.129 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record -0.7 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Ionela Voinescu , Kamil Debski , "linux-kernel@vger.kernel.org" , "linux-mtd@lists.infradead.org" , =?gb2312?B?RnJhbmsgTGl1IMH1yLogKGZyYW5rbGl1KQ==?= , =?gb2312?B?UGV0ZXIgUGFuIMXLtrAgKHBldGVycGFuZG9uZyk=?= Sender: "linux-mtd" Errors-To: linux-mtd-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org Currently nand_bbt.c is tied with struct nand_chip, and it makes other NAND family chips hard to use nand_bbt.c. Maybe it's the reason why onenand has own bbt(onenand_bbt.c). Parameterize a few relevant device detail information into a new nand_bbt struct, and set some hooks for chip specified part. Allocate and initialize struct nand_bbt in nand_base.c. Most of the patch is borrowed from Brian Norris . http://git.infradead.org/users/norris/linux-mtd.git/shortlog/refs/heads/nand-bbt Signed-off-by: Peter Pan Signed-off-by: Brian Norris Tested-by: Kamil Debski Reviewed-by: Ionela Voinescu Tested-by: Ionela Voinescu --- changelog: v1-v2: Address Kamil Debski's test Add necessary comments to nand_bbt struct drivers/mtd/nand/docg4.c | 8 +- drivers/mtd/nand/nand_base.c | 145 +++++++++++- drivers/mtd/nand/nand_bbt.c | 524 +++++++++++++++++-------------------------- include/linux/mtd/bbm.h | 96 +------- include/linux/mtd/nand.h | 14 +- include/linux/mtd/nand_bbt.h | 172 ++++++++++++++ 6 files changed, 533 insertions(+), 426 deletions(-) create mode 100644 include/linux/mtd/nand_bbt.h diff --git a/drivers/mtd/nand/docg4.c b/drivers/mtd/nand/docg4.c index e5d7bca..eb55a21 100644 --- a/drivers/mtd/nand/docg4.c +++ b/drivers/mtd/nand/docg4.c @@ -1037,7 +1037,7 @@ static int __init read_factory_bbt(struct mtd_info *mtd) * operation after device power-up. The above read ensures it never is. * Ugly, I know. */ - if (nand->bbt == NULL) /* no memory-based bbt */ + if (nand->nand_bbt == NULL) /* no memory-based bbt */ goto exit; if (mtd->ecc_stats.failed > eccfailed_stats) { @@ -1064,7 +1064,11 @@ static int __init read_factory_bbt(struct mtd_info *mtd) unsigned long bits = ~buf[i]; for_each_set_bit(bitnum, &bits, 8) { int badblock = block + 7 - bitnum; - nand->bbt[badblock / 4] |= + /* + * Should we create a mark factory bad block interface + * for this? + */ + nand->nand_bbt->bbt[badblock / 4] |= 0x03 << ((badblock % 4) * 2); mtd->ecc_stats.badblocks++; dev_notice(doc->dev, "factory-marked bad block: %d\n", diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c index ceb68ca..eb94714 100644 --- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -97,6 +97,9 @@ static int nand_get_device(struct mtd_info *mtd, int new_state); static int nand_do_write_oob(struct mtd_info *mtd, loff_t to, struct mtd_oob_ops *ops); +static int nand_erase_nand(struct mtd_info *mtd, struct erase_info *instr, + int allowbbt); + /* * For devices which display every fart in the system on a separate LED. Is * compiled away when LED support is disabled. @@ -450,8 +453,8 @@ static int nand_block_markbad_lowlevel(struct mtd_info *mtd, loff_t ofs) } /* Mark block bad in BBT */ - if (chip->bbt) { - res = nand_markbad_bbt(mtd, ofs); + if (chip->nand_bbt) { + res = nand_bbt_markbad(chip->nand_bbt, ofs); if (!ret) ret = res; } @@ -493,10 +496,10 @@ static int nand_block_isreserved(struct mtd_info *mtd, loff_t ofs) { struct nand_chip *chip = mtd->priv; - if (!chip->bbt) + if (!chip->nand_bbt) return 0; /* Return info from the table */ - return nand_isreserved_bbt(mtd, ofs); + return nand_bbt_isreserved(chip->nand_bbt, ofs); } /** @@ -513,12 +516,18 @@ static int nand_block_checkbad(struct mtd_info *mtd, loff_t ofs, int getchip, int allowbbt) { struct nand_chip *chip = mtd->priv; + struct nand_bbt *bbt = chip->nand_bbt; - if (!chip->bbt) + if (!bbt) return chip->block_bad(mtd, ofs, getchip); /* Return info from the table */ - return nand_isbad_bbt(mtd, ofs, allowbbt); + if (nand_bbt_isbad(bbt, ofs)) + return 1; + else if (allowbbt) + return 0; + else + return nand_bbt_isreserved(bbt, ofs); } /** @@ -2729,7 +2738,7 @@ static int nand_erase(struct mtd_info *mtd, struct erase_info *instr) * * Erase one ore more blocks. */ -int nand_erase_nand(struct mtd_info *mtd, struct erase_info *instr, +static int nand_erase_nand(struct mtd_info *mtd, struct erase_info *instr, int allowbbt) { int page, status, pages_per_block, ret, chipnr; @@ -2836,6 +2845,122 @@ erase_exit: return ret; } +/* NAND BBT helper - erase a block, including reserved blocks */ +static int nand_bbt_erase_block(struct mtd_info *mtd, loff_t addr) +{ + struct erase_info einfo; + struct nand_chip *chip = mtd->priv; + + memset(&einfo, 0, sizeof(einfo)); + einfo.mtd = mtd; + einfo.addr = addr; + einfo.len = 1ULL << chip->phys_erase_shift; + + return nand_erase_nand(mtd, &einfo, 1); +} + +static uint8_t scan_ff_pattern[] = { 0xff, 0xff }; +#define BADBLOCK_SCAN_MASK (~NAND_BBT_NO_OOB) +/** + * nand_create_factory_badblock_pattern - [INTERN] Creates a BBT descriptor + * structure for factory bad block marker + * @chip: NAND chip to create descriptor for + * + * This function allocates and initializes a badblock_pattern for factory bad + * block marker based on the properties of @chip when chip.badblock_pattern + * is NULL. + */ +static int nand_create_factory_badblock_pattern(struct nand_chip *chip) +{ + struct nand_bbt_descr *bd; + + if (chip->badblock_pattern) { + pr_warn("Bad block pattern already allocated; not replacing\n"); + return -EINVAL; + } + bd = kzalloc(sizeof(*bd), GFP_KERNEL); + if (!bd) + return -ENOMEM; + bd->options = chip->bbt_options & BADBLOCK_SCAN_MASK; + bd->offs = chip->badblockpos; + bd->len = (chip->options & NAND_BUSWIDTH_16) ? 2 : 1; + bd->pattern = scan_ff_pattern; + bd->options |= NAND_BADBLOCK_PATTERN_ALLOC; + chip->badblock_pattern = bd; + + return 0; +} + +static int nand_is_bad_bbm(struct mtd_info *mtd, loff_t addr) +{ + struct nand_chip *chip = mtd->priv; + struct mtd_oob_ops ops; + struct nand_bbt_descr *bd = chip->badblock_pattern; + int j, ret; + int numpages; + + if (bd->options & NAND_BBT_SCAN2NDPAGE) + numpages = 2; + else + numpages = 1; + + if (bd->options & NAND_BBT_SCANLASTPAGE) + addr += mtd->erasesize - (mtd->writesize * numpages); + + ops.ooblen = mtd->oobsize; + ops.oobbuf = chip->buffers->databuf; + ops.ooboffs = 0; + ops.datbuf = NULL; + ops.mode = MTD_OPS_PLACE_OOB; + + for (j = 0; j < numpages; j++) { + /* + * Read the full oob until read_oob is fixed to handle single + * byte reads for 16 bit buswidth. + */ + ret = nand_do_read_oob(mtd, addr, &ops); + /* Ignore ECC errors when checking for BBM */ + if (ret && !mtd_is_bitflip_or_eccerr(ret)) + return ret; + + if (memcmp(chip->buffers->databuf + bd->offs, + bd->pattern, bd->len)) + return 1; + + addr += mtd->writesize; + } + + return 0; +} + +static int nand_default_bbt(struct mtd_info *mtd) +{ + struct nand_chip *chip = mtd->priv; + struct nand_bbt *bbt = kzalloc(sizeof(struct nand_bbt), GFP_KERNEL); + + if (!bbt) + return -ENOMEM; + + bbt->bbt_options = chip->bbt_options; + bbt->mtd = mtd; + bbt->numchips = chip->numchips; + bbt->chipsize = chip->chipsize; + bbt->chip_shift = chip->chip_shift; + bbt->bbt_erase_shift = chip->phys_erase_shift; + bbt->page_shift = chip->page_shift; + bbt->bbt_td = chip->bbt_td; + bbt->bbt_md = chip->bbt_md; + bbt->is_bad_bbm = nand_is_bad_bbm; + bbt->erase = nand_bbt_erase_block; + chip->nand_bbt = bbt; + + if (!chip->badblock_pattern && + nand_create_factory_badblock_pattern(chip)) + return -ENOMEM; + + return nand_bbt_init(chip->nand_bbt); +} + /** * nand_sync - [MTD Interface] sync * @mtd: MTD device structure @@ -4291,13 +4416,15 @@ void nand_release(struct mtd_info *mtd) mtd_device_unregister(mtd); /* Free bad block table memory */ - kfree(chip->bbt); + if (chip->nand_bbt) + nand_bbt_release(chip->nand_bbt); + kfree(chip->nand_bbt); if (!(chip->options & NAND_OWN_BUFFERS)) kfree(chip->buffers); /* Free bad block descriptor memory */ if (chip->badblock_pattern && chip->badblock_pattern->options - & NAND_BBT_DYNAMICSTRUCT) + & NAND_BADBLOCK_PATTERN_ALLOC) kfree(chip->badblock_pattern); } EXPORT_SYMBOL_GPL(nand_release); diff --git a/drivers/mtd/nand/nand_bbt.c b/drivers/mtd/nand/nand_bbt.c index 63a1a36..88cb54d 100644 --- a/drivers/mtd/nand/nand_bbt.c +++ b/drivers/mtd/nand/nand_bbt.c @@ -60,8 +60,7 @@ #include #include #include -#include -#include +#include #include #include #include @@ -76,20 +75,20 @@ #define BBT_ENTRY_MASK 0x03 #define BBT_ENTRY_SHIFT 2 -static int nand_update_bbt(struct mtd_info *mtd, loff_t offs); +static int nand_update_bbt(struct nand_bbt *bbt, loff_t offs); -static inline uint8_t bbt_get_entry(struct nand_chip *chip, int block) +static inline uint8_t bbt_get_entry(struct nand_bbt *bbt, int block) { - uint8_t entry = chip->bbt[block >> BBT_ENTRY_SHIFT]; + uint8_t entry = bbt->bbt[block >> BBT_ENTRY_SHIFT]; entry >>= (block & BBT_ENTRY_MASK) * 2; return entry & BBT_ENTRY_MASK; } -static inline void bbt_mark_entry(struct nand_chip *chip, int block, +static inline void bbt_mark_entry(struct nand_bbt *bbt, int block, uint8_t mark) { uint8_t msk = (mark & BBT_ENTRY_MASK) << ((block & BBT_ENTRY_MASK) * 2); - chip->bbt[block >> BBT_ENTRY_SHIFT] |= msk; + bbt->bbt[block >> BBT_ENTRY_SHIFT] |= msk; } static int check_pattern_no_oob(uint8_t *buf, struct nand_bbt_descr *td) @@ -122,23 +121,6 @@ static int check_pattern(uint8_t *buf, int len, int paglen, struct nand_bbt_desc } /** - * check_short_pattern - [GENERIC] check if a pattern is in the buffer - * @buf: the buffer to search - * @td: search pattern descriptor - * - * Check for a pattern at the given place. Used to search bad block tables and - * good / bad block identifiers. Same as check_pattern, but no optional empty - * check. - */ -static int check_short_pattern(uint8_t *buf, struct nand_bbt_descr *td) -{ - /* Compare the pattern */ - if (memcmp(buf + td->offs, td->pattern, td->len)) - return -1; - return 0; -} - -/** * add_marker_len - compute the length of the marker in data area * @td: BBT descriptor used for computation * @@ -159,7 +141,7 @@ static u32 add_marker_len(struct nand_bbt_descr *td) /** * read_bbt - [GENERIC] Read the bad block table starting from page - * @mtd: MTD device structure + * @bbt: NAND BBT structure * @buf: temporary buffer * @page: the starting page * @num: the number of bbt descriptors to read @@ -168,11 +150,11 @@ static u32 add_marker_len(struct nand_bbt_descr *td) * * Read the bad block table starting from page. */ -static int read_bbt(struct mtd_info *mtd, uint8_t *buf, int page, int num, +static int read_bbt(struct nand_bbt *bbt, uint8_t *buf, int page, int num, struct nand_bbt_descr *td, int offs) { + struct mtd_info *mtd = bbt->mtd; int res, ret = 0, i, j, act = 0; - struct nand_chip *this = mtd->priv; size_t retlen, len, totlen; loff_t from; int bits = td->options & NAND_BBT_NRBITS_MSK; @@ -182,10 +164,10 @@ static int read_bbt(struct mtd_info *mtd, uint8_t *buf, int page, int num, totlen = (num * bits) >> 3; marker_len = add_marker_len(td); - from = ((loff_t)page) << this->page_shift; + from = ((loff_t)page) << bbt->page_shift; while (totlen) { - len = min(totlen, (size_t)(1 << this->bbt_erase_shift)); + len = min(totlen, (size_t)(1 << bbt->bbt_erase_shift)); if (marker_len) { /* * In case the BBT marker is not in the OOB area it @@ -221,8 +203,8 @@ static int read_bbt(struct mtd_info *mtd, uint8_t *buf, int page, int num, if (reserved_block_code && (tmp == reserved_block_code)) { pr_info("nand_read_bbt: reserved block at 0x%012llx\n", (loff_t)(offs + act) << - this->bbt_erase_shift); - bbt_mark_entry(this, offs + act, + bbt->bbt_erase_shift); + bbt_mark_entry(bbt, offs + act, BBT_BLOCK_RESERVED); mtd->ecc_stats.bbtblocks++; continue; @@ -233,13 +215,13 @@ static int read_bbt(struct mtd_info *mtd, uint8_t *buf, int page, int num, */ pr_info("nand_read_bbt: bad block at 0x%012llx\n", (loff_t)(offs + act) << - this->bbt_erase_shift); + bbt->bbt_erase_shift); /* Factory marked bad or worn out? */ if (tmp == 0) - bbt_mark_entry(this, offs + act, + bbt_mark_entry(bbt, offs + act, BBT_BLOCK_FACTORY_BAD); else - bbt_mark_entry(this, offs + act, + bbt_mark_entry(bbt, offs + act, BBT_BLOCK_WORN); mtd->ecc_stats.badblocks++; } @@ -252,7 +234,7 @@ static int read_bbt(struct mtd_info *mtd, uint8_t *buf, int page, int num, /** * read_abs_bbt - [GENERIC] Read the bad block table starting at a given page - * @mtd: MTD device structure + * @bbt: NAND BBT structure * @buf: temporary buffer * @td: descriptor for the bad block table * @chip: read the table for a specific chip, -1 read all chips; applies only if @@ -261,25 +243,26 @@ static int read_bbt(struct mtd_info *mtd, uint8_t *buf, int page, int num, * Read the bad block table for all chips starting at a given page. We assume * that the bbt bits are in consecutive order. */ -static int read_abs_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td, int chip) +static int read_abs_bbt(struct nand_bbt *bbt, uint8_t *buf, + struct nand_bbt_descr *td, int chip) { - struct nand_chip *this = mtd->priv; + struct mtd_info *mtd = bbt->mtd; int res = 0, i; if (td->options & NAND_BBT_PERCHIP) { int offs = 0; - for (i = 0; i < this->numchips; i++) { + for (i = 0; i < bbt->numchips; i++) { if (chip == -1 || chip == i) - res = read_bbt(mtd, buf, td->pages[i], - this->chipsize >> this->bbt_erase_shift, + res = read_bbt(bbt, buf, td->pages[i], + bbt->chipsize >> bbt->bbt_erase_shift, td, offs); if (res) return res; - offs += this->chipsize >> this->bbt_erase_shift; + offs += bbt->chipsize >> bbt->bbt_erase_shift; } } else { - res = read_bbt(mtd, buf, td->pages[0], - mtd->size >> this->bbt_erase_shift, td, 0); + res = read_bbt(bbt, buf, td->pages[0], + mtd->size >> bbt->bbt_erase_shift, td, 0); if (res) return res; } @@ -287,7 +270,7 @@ static int read_abs_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_desc } /* BBT marker is in the first page, no OOB */ -static int scan_read_data(struct mtd_info *mtd, uint8_t *buf, loff_t offs, +static int scan_read_data(struct nand_bbt *bbt, uint8_t *buf, loff_t offs, struct nand_bbt_descr *td) { size_t retlen; @@ -297,12 +280,12 @@ static int scan_read_data(struct mtd_info *mtd, uint8_t *buf, loff_t offs, if (td->options & NAND_BBT_VERSION) len++; - return mtd_read(mtd, offs, len, &retlen, buf); + return mtd_read(bbt->mtd, offs, len, &retlen, buf); } /** * scan_read_oob - [GENERIC] Scan data+OOB region to buffer - * @mtd: MTD device structure + * @bbt: NAND BBT structure * @buf: temporary buffer * @offs: offset at which to scan * @len: length of data region to read @@ -311,9 +294,10 @@ static int scan_read_data(struct mtd_info *mtd, uint8_t *buf, loff_t offs, * page,OOB,page,OOB,... in buf. Completes transfer and returns the "strongest" * ECC condition (error or bitflip). May quit on the first (non-ECC) error. */ -static int scan_read_oob(struct mtd_info *mtd, uint8_t *buf, loff_t offs, +static int scan_read_oob(struct nand_bbt *bbt, uint8_t *buf, loff_t offs, size_t len) { + struct mtd_info *mtd = bbt->mtd; struct mtd_oob_ops ops; int res, ret = 0; @@ -341,19 +325,20 @@ static int scan_read_oob(struct mtd_info *mtd, uint8_t *buf, loff_t offs, return ret; } -static int scan_read(struct mtd_info *mtd, uint8_t *buf, loff_t offs, +static int scan_read(struct nand_bbt *bbt, uint8_t *buf, loff_t offs, size_t len, struct nand_bbt_descr *td) { if (td->options & NAND_BBT_NO_OOB) - return scan_read_data(mtd, buf, offs, td); + return scan_read_data(bbt, buf, offs, td); else - return scan_read_oob(mtd, buf, offs, len); + return scan_read_oob(bbt, buf, offs, len); } /* Scan write data with oob to flash */ -static int scan_write_bbt(struct mtd_info *mtd, loff_t offs, size_t len, +static int scan_write_bbt(struct nand_bbt *bbt, loff_t offs, size_t len, uint8_t *buf, uint8_t *oob) { + struct mtd_info *mtd = bbt->mtd; struct mtd_oob_ops ops; ops.mode = MTD_OPS_PLACE_OOB; @@ -366,18 +351,18 @@ static int scan_write_bbt(struct mtd_info *mtd, loff_t offs, size_t len, return mtd_write_oob(mtd, offs, &ops); } -static u32 bbt_get_ver_offs(struct mtd_info *mtd, struct nand_bbt_descr *td) +static u32 bbt_get_ver_offs(struct nand_bbt *bbt, struct nand_bbt_descr *td) { u32 ver_offs = td->veroffs; if (!(td->options & NAND_BBT_NO_OOB)) - ver_offs += mtd->writesize; + ver_offs += bbt->mtd->writesize; return ver_offs; } /** * read_abs_bbts - [GENERIC] Read the bad block table(s) for all chips starting at a given page - * @mtd: MTD device structure + * @bbt: NAND BBT structure * @buf: temporary buffer * @td: descriptor for the bad block table * @md: descriptor for the bad block table mirror @@ -385,130 +370,85 @@ static u32 bbt_get_ver_offs(struct mtd_info *mtd, struct nand_bbt_descr *td) * Read the bad block table(s) for all chips starting at a given page. We * assume that the bbt bits are in consecutive order. */ -static void read_abs_bbts(struct mtd_info *mtd, uint8_t *buf, +static void read_abs_bbts(struct nand_bbt *bbt, uint8_t *buf, struct nand_bbt_descr *td, struct nand_bbt_descr *md) { - struct nand_chip *this = mtd->priv; + struct mtd_info *mtd = bbt->mtd; /* Read the primary version, if available */ if (td->options & NAND_BBT_VERSION) { - scan_read(mtd, buf, (loff_t)td->pages[0] << this->page_shift, + scan_read(bbt, buf, (loff_t)td->pages[0] << bbt->page_shift, mtd->writesize, td); - td->version[0] = buf[bbt_get_ver_offs(mtd, td)]; + td->version[0] = buf[bbt_get_ver_offs(bbt, td)]; pr_info("Bad block table at page %d, version 0x%02X\n", td->pages[0], td->version[0]); } /* Read the mirror version, if available */ if (md && (md->options & NAND_BBT_VERSION)) { - scan_read(mtd, buf, (loff_t)md->pages[0] << this->page_shift, + scan_read(bbt, buf, (loff_t)md->pages[0] << bbt->page_shift, mtd->writesize, md); - md->version[0] = buf[bbt_get_ver_offs(mtd, md)]; + md->version[0] = buf[bbt_get_ver_offs(bbt, md)]; pr_info("Bad block table at page %d, version 0x%02X\n", md->pages[0], md->version[0]); } } -/* Scan a given block partially */ -static int scan_block_fast(struct mtd_info *mtd, struct nand_bbt_descr *bd, - loff_t offs, uint8_t *buf, int numpages) -{ - struct mtd_oob_ops ops; - int j, ret; - - ops.ooblen = mtd->oobsize; - ops.oobbuf = buf; - ops.ooboffs = 0; - ops.datbuf = NULL; - ops.mode = MTD_OPS_PLACE_OOB; - - for (j = 0; j < numpages; j++) { - /* - * Read the full oob until read_oob is fixed to handle single - * byte reads for 16 bit buswidth. - */ - ret = mtd_read_oob(mtd, offs, &ops); - /* Ignore ECC errors when checking for BBM */ - if (ret && !mtd_is_bitflip_or_eccerr(ret)) - return ret; - - if (check_short_pattern(buf, bd)) - return 1; - - offs += mtd->writesize; - } - return 0; -} - /** * create_bbt - [GENERIC] Create a bad block table by scanning the device - * @mtd: MTD device structure - * @buf: temporary buffer - * @bd: descriptor for the good/bad block search pattern + * @bbt: NAND BBT structure * @chip: create the table for a specific chip, -1 read all chips; applies only * if NAND_BBT_PERCHIP option is set * * Create a bad block table by scanning the device for the given good/bad block * identify pattern. */ -static int create_bbt(struct mtd_info *mtd, uint8_t *buf, - struct nand_bbt_descr *bd, int chip) +static int create_bbt(struct nand_bbt *bbt, int chip) { - struct nand_chip *this = mtd->priv; - int i, numblocks, numpages; - int startblock; + struct mtd_info *mtd = bbt->mtd; + int i, startblock, numblocks; loff_t from; pr_info("Scanning device for bad blocks\n"); - if (bd->options & NAND_BBT_SCAN2NDPAGE) - numpages = 2; - else - numpages = 1; - if (chip == -1) { - numblocks = mtd->size >> this->bbt_erase_shift; + numblocks = mtd->size >> bbt->bbt_erase_shift; startblock = 0; from = 0; } else { - if (chip >= this->numchips) { + if (chip >= bbt->numchips) { pr_warn("create_bbt(): chipnr (%d) > available chips (%d)\n", - chip + 1, this->numchips); + chip + 1, bbt->numchips); return -EINVAL; } - numblocks = this->chipsize >> this->bbt_erase_shift; + numblocks = bbt->chipsize >> bbt->bbt_erase_shift; startblock = chip * numblocks; numblocks += startblock; - from = (loff_t)startblock << this->bbt_erase_shift; + from = (loff_t)startblock << bbt->bbt_erase_shift; } - if (this->bbt_options & NAND_BBT_SCANLASTPAGE) - from += mtd->erasesize - (mtd->writesize * numpages); - for (i = startblock; i < numblocks; i++) { int ret; - BUG_ON(bd->options & NAND_BBT_NO_OOB); - - ret = scan_block_fast(mtd, bd, from, buf, numpages); + ret = bbt->is_bad_bbm(mtd, from); if (ret < 0) return ret; if (ret) { - bbt_mark_entry(this, i, BBT_BLOCK_FACTORY_BAD); + bbt_mark_entry(bbt, i, BBT_BLOCK_FACTORY_BAD); pr_warn("Bad eraseblock %d at 0x%012llx\n", i, (unsigned long long)from); mtd->ecc_stats.badblocks++; } - from += (1 << this->bbt_erase_shift); + from += (1 << bbt->bbt_erase_shift); } return 0; } /** * search_bbt - [GENERIC] scan the device for a specific bad block table - * @mtd: MTD device structure + * @bbt: NAND BBT structure * @buf: temporary buffer * @td: descriptor for the bad block table * @@ -521,18 +461,19 @@ static int create_bbt(struct mtd_info *mtd, uint8_t *buf, * * The bbt ident pattern resides in the oob area of the first page in a block. */ -static int search_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td) +static int search_bbt(struct nand_bbt *bbt, uint8_t *buf, + struct nand_bbt_descr *td) { - struct nand_chip *this = mtd->priv; + struct mtd_info *mtd = bbt->mtd; int i, chips; int startblock, block, dir; int scanlen = mtd->writesize + mtd->oobsize; int bbtblocks; - int blocktopage = this->bbt_erase_shift - this->page_shift; + int blocktopage = bbt->bbt_erase_shift - bbt->page_shift; /* Search direction top -> down? */ if (td->options & NAND_BBT_LASTBLOCK) { - startblock = (mtd->size >> this->bbt_erase_shift) - 1; + startblock = (mtd->size >> bbt->bbt_erase_shift) - 1; dir = -1; } else { startblock = 0; @@ -541,12 +482,12 @@ static int search_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr /* Do we have a bbt per chip? */ if (td->options & NAND_BBT_PERCHIP) { - chips = this->numchips; - bbtblocks = this->chipsize >> this->bbt_erase_shift; + chips = bbt->numchips; + bbtblocks = bbt->chipsize >> bbt->bbt_erase_shift; startblock &= bbtblocks - 1; } else { chips = 1; - bbtblocks = mtd->size >> this->bbt_erase_shift; + bbtblocks = mtd->size >> bbt->bbt_erase_shift; } for (i = 0; i < chips; i++) { @@ -557,20 +498,20 @@ static int search_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr for (block = 0; block < td->maxblocks; block++) { int actblock = startblock + dir * block; - loff_t offs = (loff_t)actblock << this->bbt_erase_shift; + loff_t offs = (loff_t)actblock << bbt->bbt_erase_shift; /* Read first page */ - scan_read(mtd, buf, offs, mtd->writesize, td); + scan_read(bbt, buf, offs, mtd->writesize, td); if (!check_pattern(buf, scanlen, mtd->writesize, td)) { td->pages[i] = actblock << blocktopage; if (td->options & NAND_BBT_VERSION) { - offs = bbt_get_ver_offs(mtd, td); + offs = bbt_get_ver_offs(bbt, td); td->version[i] = buf[offs]; } break; } } - startblock += this->chipsize >> this->bbt_erase_shift; + startblock += bbt->chipsize >> bbt->bbt_erase_shift; } /* Check, if we found a bbt for each requested chip */ for (i = 0; i < chips; i++) { @@ -585,28 +526,28 @@ static int search_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr /** * search_read_bbts - [GENERIC] scan the device for bad block table(s) - * @mtd: MTD device structure + * @bbt: NAND BBT structure * @buf: temporary buffer * @td: descriptor for the bad block table * @md: descriptor for the bad block table mirror * * Search and read the bad block table(s). */ -static void search_read_bbts(struct mtd_info *mtd, uint8_t *buf, +static void search_read_bbts(struct nand_bbt *bbt, uint8_t *buf, struct nand_bbt_descr *td, struct nand_bbt_descr *md) { /* Search the primary table */ - search_bbt(mtd, buf, td); + search_bbt(bbt, buf, td); /* Search the mirror table */ if (md) - search_bbt(mtd, buf, md); + search_bbt(bbt, buf, md); } /** * write_bbt - [GENERIC] (Re)write the bad block table - * @mtd: MTD device structure + * @bbt: NAND BBT structure * @buf: temporary buffer * @td: descriptor for the bad block table * @md: descriptor for the bad block table mirror @@ -614,12 +555,11 @@ static void search_read_bbts(struct mtd_info *mtd, uint8_t *buf, * * (Re)write the bad block table. */ -static int write_bbt(struct mtd_info *mtd, uint8_t *buf, +static int write_bbt(struct nand_bbt *bbt, uint8_t *buf, struct nand_bbt_descr *td, struct nand_bbt_descr *md, int chipsel) { - struct nand_chip *this = mtd->priv; - struct erase_info einfo; + struct mtd_info *mtd = bbt->mtd; int i, res, chip = 0; int bits, startblock, dir, page, offs, numblocks, sft, sftmsk; int nrchips, pageoffs, ooboffs; @@ -638,16 +578,16 @@ static int write_bbt(struct mtd_info *mtd, uint8_t *buf, rcode = 0xff; /* Write bad block table per chip rather than per device? */ if (td->options & NAND_BBT_PERCHIP) { - numblocks = (int)(this->chipsize >> this->bbt_erase_shift); + numblocks = (int)(bbt->chipsize >> bbt->bbt_erase_shift); /* Full device write or specific chip? */ if (chipsel == -1) { - nrchips = this->numchips; + nrchips = bbt->numchips; } else { nrchips = chipsel + 1; chip = chipsel; } } else { - numblocks = (int)(mtd->size >> this->bbt_erase_shift); + numblocks = (int)(mtd->size >> bbt->bbt_erase_shift); nrchips = 1; } @@ -678,13 +618,13 @@ static int write_bbt(struct mtd_info *mtd, uint8_t *buf, for (i = 0; i < td->maxblocks; i++) { int block = startblock + dir * i; /* Check, if the block is bad */ - switch (bbt_get_entry(this, block)) { + switch (bbt_get_entry(bbt, block)) { case BBT_BLOCK_WORN: case BBT_BLOCK_FACTORY_BAD: continue; } page = block << - (this->bbt_erase_shift - this->page_shift); + (bbt->bbt_erase_shift - bbt->page_shift); /* Check, if the block is used by the mirror table */ if (!md || md->pages[chip] != page) goto write; @@ -712,13 +652,13 @@ static int write_bbt(struct mtd_info *mtd, uint8_t *buf, default: return -EINVAL; } - to = ((loff_t)page) << this->page_shift; + to = ((loff_t)page) << bbt->page_shift; /* Must we save the block contents? */ if (td->options & NAND_BBT_SAVECONTENT) { /* Make it block aligned */ - to &= ~(((loff_t)1 << this->bbt_erase_shift) - 1); - len = 1 << this->bbt_erase_shift; + to &= ~((loff_t)((1 << bbt->bbt_erase_shift) - 1)); + len = 1 << bbt->bbt_erase_shift; res = mtd_read(mtd, to, len, &retlen, buf); if (res < 0) { if (retlen != len) { @@ -728,15 +668,15 @@ static int write_bbt(struct mtd_info *mtd, uint8_t *buf, pr_warn("nand_bbt: ECC error while reading block for writing bad block table\n"); } /* Read oob data */ - ops.ooblen = (len >> this->page_shift) * mtd->oobsize; + ops.ooblen = (len >> bbt->page_shift) * mtd->oobsize; ops.oobbuf = &buf[len]; res = mtd_read_oob(mtd, to + mtd->writesize, &ops); if (res < 0 || ops.oobretlen != ops.ooblen) goto outerr; /* Calc the byte offset in the buffer */ - pageoffs = page - (int)(to >> this->page_shift); - offs = pageoffs << this->page_shift; + pageoffs = page - (int)(to >> bbt->page_shift); + offs = pageoffs << bbt->page_shift; /* Preset the bbt area with 0xff */ memset(&buf[offs], 0xff, (size_t)(numblocks >> sft)); ooboffs = len + (pageoffs * mtd->oobsize); @@ -763,7 +703,7 @@ static int write_bbt(struct mtd_info *mtd, uint8_t *buf, len = ALIGN(len, mtd->writesize); /* Preset the buffer with 0xff */ memset(buf, 0xff, len + - (len >> this->page_shift)* mtd->oobsize); + (len >> bbt->page_shift) * mtd->oobsize); offs = 0; ooboffs = len; /* Pattern is located in oob area of first page */ @@ -777,20 +717,16 @@ static int write_bbt(struct mtd_info *mtd, uint8_t *buf, for (i = 0; i < numblocks; i++) { uint8_t dat; int sftcnt = (i << (3 - sft)) & sftmsk; - dat = bbt_get_entry(this, chip * numblocks + i); + dat = bbt_get_entry(bbt, chip * numblocks + i); /* Do not store the reserved bbt blocks! */ buf[offs + (i >> sft)] &= ~(msk[dat] << sftcnt); } - memset(&einfo, 0, sizeof(einfo)); - einfo.mtd = mtd; - einfo.addr = to; - einfo.len = 1 << this->bbt_erase_shift; - res = nand_erase_nand(mtd, &einfo, 1); + res = bbt->erase(mtd, to); if (res < 0) goto outerr; - res = scan_write_bbt(mtd, to, len, buf, + res = scan_write_bbt(bbt, to, len, buf, td->options & NAND_BBT_NO_OOB ? NULL : &buf[len]); if (res < 0) @@ -811,41 +747,36 @@ static int write_bbt(struct mtd_info *mtd, uint8_t *buf, /** * nand_memory_bbt - [GENERIC] create a memory based bad block table - * @mtd: MTD device structure - * @bd: descriptor for the good/bad block search pattern + * @bbt: NAND BBT structure * * The function creates a memory based bbt by scanning the device for * manufacturer / software marked good / bad blocks. */ -static inline int nand_memory_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd) +static inline int nand_memory_bbt(struct nand_bbt *bbt) { - struct nand_chip *this = mtd->priv; - - return create_bbt(mtd, this->buffers->databuf, bd, -1); + return create_bbt(bbt, -1); } /** * check_create - [GENERIC] create and write bbt(s) if necessary - * @mtd: MTD device structure + * @bbt: NAND BBT structure * @buf: temporary buffer - * @bd: descriptor for the good/bad block search pattern * * The function checks the results of the previous call to read_bbt and creates * / updates the bbt(s) if necessary. Creation is necessary if no bbt was found * for the chip/device. Update is necessary if one of the tables is missing or * the version nr. of one table is less than the other. */ -static int check_create(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *bd) +static int check_create(struct nand_bbt *bbt, uint8_t *buf) { int i, chips, writeops, create, chipsel, res, res2; - struct nand_chip *this = mtd->priv; - struct nand_bbt_descr *td = this->bbt_td; - struct nand_bbt_descr *md = this->bbt_md; + struct nand_bbt_descr *td = bbt->bbt_td; + struct nand_bbt_descr *md = bbt->bbt_md; struct nand_bbt_descr *rd, *rd2; /* Do we have a bbt per chip? */ if (td->options & NAND_BBT_PERCHIP) - chips = this->numchips; + chips = bbt->numchips; else chips = 1; @@ -894,8 +825,8 @@ static int check_create(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_desc continue; /* Create the table in memory by scanning the chip(s) */ - if (!(this->bbt_options & NAND_BBT_CREATE_EMPTY)) - create_bbt(mtd, buf, bd, chipsel); + if (!(bbt->bbt_options & NAND_BBT_CREATE_EMPTY)) + create_bbt(bbt, chipsel); td->version[i] = 1; if (md) @@ -904,7 +835,7 @@ static int check_create(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_desc /* Read back first? */ if (rd) { - res = read_abs_bbt(mtd, buf, rd, chipsel); + res = read_abs_bbt(bbt, buf, rd, chipsel); if (mtd_is_eccerr(res)) { /* Mark table as invalid */ rd->pages[i] = -1; @@ -915,7 +846,7 @@ static int check_create(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_desc } /* If they weren't versioned, read both */ if (rd2) { - res2 = read_abs_bbt(mtd, buf, rd2, chipsel); + res2 = read_abs_bbt(bbt, buf, rd2, chipsel); if (mtd_is_eccerr(res2)) { /* Mark table as invalid */ rd2->pages[i] = -1; @@ -937,14 +868,14 @@ static int check_create(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_desc /* Write the bad block table to the device? */ if ((writeops & 0x01) && (td->options & NAND_BBT_WRITE)) { - res = write_bbt(mtd, buf, td, md, chipsel); + res = write_bbt(bbt, buf, td, md, chipsel); if (res < 0) return res; } /* Write the mirror bad block table to the device? */ if ((writeops & 0x02) && md && (md->options & NAND_BBT_WRITE)) { - res = write_bbt(mtd, buf, md, td, chipsel); + res = write_bbt(bbt, buf, md, td, chipsel); if (res < 0) return res; } @@ -954,25 +885,25 @@ static int check_create(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_desc /** * mark_bbt_regions - [GENERIC] mark the bad block table regions - * @mtd: MTD device structure + * @bbt: NAND BBT structure * @td: bad block table descriptor * * The bad block table regions are marked as "bad" to prevent accidental * erasures / writes. The regions are identified by the mark 0x02. */ -static void mark_bbt_region(struct mtd_info *mtd, struct nand_bbt_descr *td) +static void mark_bbt_region(struct nand_bbt *bbt, struct nand_bbt_descr *td) { - struct nand_chip *this = mtd->priv; + struct mtd_info *mtd = bbt->mtd; int i, j, chips, block, nrblocks, update; uint8_t oldval; /* Do we have a bbt per chip? */ if (td->options & NAND_BBT_PERCHIP) { - chips = this->numchips; - nrblocks = (int)(this->chipsize >> this->bbt_erase_shift); + chips = bbt->numchips; + nrblocks = (int)(bbt->chipsize >> bbt->bbt_erase_shift); } else { chips = 1; - nrblocks = (int)(mtd->size >> this->bbt_erase_shift); + nrblocks = (int)(mtd->size >> bbt->bbt_erase_shift); } for (i = 0; i < chips; i++) { @@ -980,13 +911,14 @@ static void mark_bbt_region(struct mtd_info *mtd, struct nand_bbt_descr *td) !(td->options & NAND_BBT_WRITE)) { if (td->pages[i] == -1) continue; - block = td->pages[i] >> (this->bbt_erase_shift - this->page_shift); - oldval = bbt_get_entry(this, block); - bbt_mark_entry(this, block, BBT_BLOCK_RESERVED); + block = td->pages[i] >> + (bbt->bbt_erase_shift - bbt->page_shift); + oldval = bbt_get_entry(bbt, block); + bbt_mark_entry(bbt, block, BBT_BLOCK_RESERVED); if ((oldval != BBT_BLOCK_RESERVED) && td->reserved_block_code) - nand_update_bbt(mtd, (loff_t)block << - this->bbt_erase_shift); + nand_update_bbt(bbt, (loff_t)block << + bbt->bbt_erase_shift); continue; } update = 0; @@ -995,8 +927,8 @@ static void mark_bbt_region(struct mtd_info *mtd, struct nand_bbt_descr *td) else block = i * nrblocks; for (j = 0; j < td->maxblocks; j++) { - oldval = bbt_get_entry(this, block); - bbt_mark_entry(this, block, BBT_BLOCK_RESERVED); + oldval = bbt_get_entry(bbt, block); + bbt_mark_entry(bbt, block, BBT_BLOCK_RESERVED); if (oldval != BBT_BLOCK_RESERVED) update = 1; block++; @@ -1007,22 +939,22 @@ static void mark_bbt_region(struct mtd_info *mtd, struct nand_bbt_descr *td) * bbts. This should only happen once. */ if (update && td->reserved_block_code) - nand_update_bbt(mtd, (loff_t)(block - 1) << - this->bbt_erase_shift); + nand_update_bbt(bbt, (loff_t)(block - 1) << + bbt->bbt_erase_shift); } } /** * verify_bbt_descr - verify the bad block description - * @mtd: MTD device structure + * @bbt: NAND BBT structure * @bd: the table to verify * * This functions performs a few sanity checks on the bad block description * table. */ -static void verify_bbt_descr(struct mtd_info *mtd, struct nand_bbt_descr *bd) +static void verify_bbt_descr(struct nand_bbt *bbt, struct nand_bbt_descr *bd) { - struct nand_chip *this = mtd->priv; + struct mtd_info *mtd = bbt->mtd; u32 pattern_len; u32 bits; u32 table_size; @@ -1033,16 +965,16 @@ static void verify_bbt_descr(struct mtd_info *mtd, struct nand_bbt_descr *bd) pattern_len = bd->len; bits = bd->options & NAND_BBT_NRBITS_MSK; - BUG_ON((this->bbt_options & NAND_BBT_NO_OOB) && - !(this->bbt_options & NAND_BBT_USE_FLASH)); + BUG_ON((bbt->bbt_options & NAND_BBT_NO_OOB) && + !(bbt->bbt_options & NAND_BBT_USE_FLASH)); BUG_ON(!bits); if (bd->options & NAND_BBT_VERSION) pattern_len++; if (bd->options & NAND_BBT_NO_OOB) { - BUG_ON(!(this->bbt_options & NAND_BBT_USE_FLASH)); - BUG_ON(!(this->bbt_options & NAND_BBT_NO_OOB)); + BUG_ON(!(bbt->bbt_options & NAND_BBT_USE_FLASH)); + BUG_ON(!(bbt->bbt_options & NAND_BBT_NO_OOB)); BUG_ON(bd->offs); if (bd->options & NAND_BBT_VERSION) BUG_ON(bd->veroffs != bd->len); @@ -1050,20 +982,19 @@ static void verify_bbt_descr(struct mtd_info *mtd, struct nand_bbt_descr *bd) } if (bd->options & NAND_BBT_PERCHIP) - table_size = this->chipsize >> this->bbt_erase_shift; + table_size = bbt->chipsize >> bbt->bbt_erase_shift; else - table_size = mtd->size >> this->bbt_erase_shift; + table_size = mtd->size >> bbt->bbt_erase_shift; table_size >>= 3; table_size *= bits; if (bd->options & NAND_BBT_NO_OOB) table_size += pattern_len; - BUG_ON(table_size > (1 << this->bbt_erase_shift)); + BUG_ON(table_size > (1 << bbt->bbt_erase_shift)); } /** * nand_scan_bbt - [NAND Interface] scan, find, read and maybe create bad block table(s) - * @mtd: MTD device structure - * @bd: descriptor for the good/bad block search pattern + * @bbt: NAND BBT structure * * The function checks, if a bad block table(s) is/are already available. If * not it scans the device for manufacturer marked good / bad blocks and writes @@ -1072,21 +1003,21 @@ static void verify_bbt_descr(struct mtd_info *mtd, struct nand_bbt_descr *bd) * The bad block table memory is allocated here. It must be freed by calling * the nand_free_bbt function. */ -static int nand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd) +static int nand_scan_bbt(struct nand_bbt *bbt) { - struct nand_chip *this = mtd->priv; + struct mtd_info *mtd = bbt->mtd; int len, res; uint8_t *buf; - struct nand_bbt_descr *td = this->bbt_td; - struct nand_bbt_descr *md = this->bbt_md; + struct nand_bbt_descr *td = bbt->bbt_td; + struct nand_bbt_descr *md = bbt->bbt_md; - len = mtd->size >> (this->bbt_erase_shift + 2); + len = mtd->size >> (bbt->bbt_erase_shift + 2); /* * Allocate memory (2bit per block) and clear the memory bad block * table. */ - this->bbt = kzalloc(len, GFP_KERNEL); - if (!this->bbt) + bbt->bbt = kzalloc(len, GFP_KERNEL); + if (!bbt->bbt) return -ENOMEM; /* @@ -1094,18 +1025,19 @@ static int nand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd) * memory based bad block table. */ if (!td) { - if ((res = nand_memory_bbt(mtd, bd))) { + res = nand_memory_bbt(bbt); + if (res) { pr_err("nand_bbt: can't scan flash and build the RAM-based BBT\n"); goto err; } return 0; } - verify_bbt_descr(mtd, td); - verify_bbt_descr(mtd, md); + verify_bbt_descr(bbt, td); + verify_bbt_descr(bbt, md); /* Allocate a temporary buffer for one eraseblock incl. oob */ - len = (1 << this->bbt_erase_shift); - len += (len >> this->page_shift) * mtd->oobsize; + len = (1 << bbt->bbt_erase_shift); + len += (len >> bbt->page_shift) * mtd->oobsize; buf = vmalloc(len); if (!buf) { res = -ENOMEM; @@ -1114,59 +1046,59 @@ static int nand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd) /* Is the bbt at a given page? */ if (td->options & NAND_BBT_ABSPAGE) { - read_abs_bbts(mtd, buf, td, md); + read_abs_bbts(bbt, buf, td, md); } else { /* Search the bad block table using a pattern in oob */ - search_read_bbts(mtd, buf, td, md); + search_read_bbts(bbt, buf, td, md); } - res = check_create(mtd, buf, bd); + res = check_create(bbt, buf); if (res) goto err; /* Prevent the bbt regions from erasing / writing */ - mark_bbt_region(mtd, td); + mark_bbt_region(bbt, td); if (md) - mark_bbt_region(mtd, md); + mark_bbt_region(bbt, md); vfree(buf); return 0; err: - kfree(this->bbt); - this->bbt = NULL; + kfree(bbt->bbt); + bbt->bbt = NULL; return res; } /** * nand_update_bbt - update bad block table(s) - * @mtd: MTD device structure + * @bbt: NAND BBT structure * @offs: the offset of the newly marked block * * The function updates the bad block table(s). */ -static int nand_update_bbt(struct mtd_info *mtd, loff_t offs) +static int nand_update_bbt(struct nand_bbt *bbt, loff_t offs) { - struct nand_chip *this = mtd->priv; + struct mtd_info *mtd = bbt->mtd; int len, res = 0; int chip, chipsel; uint8_t *buf; - struct nand_bbt_descr *td = this->bbt_td; - struct nand_bbt_descr *md = this->bbt_md; + struct nand_bbt_descr *td = bbt->bbt_td; + struct nand_bbt_descr *md = bbt->bbt_md; - if (!this->bbt || !td) + if (!bbt->bbt || !td) return -EINVAL; /* Allocate a temporary buffer for one eraseblock incl. oob */ - len = (1 << this->bbt_erase_shift); - len += (len >> this->page_shift) * mtd->oobsize; + len = (1 << bbt->bbt_erase_shift); + len += (len >> bbt->page_shift) * mtd->oobsize; buf = kmalloc(len, GFP_KERNEL); if (!buf) return -ENOMEM; /* Do we have a bbt per chip? */ if (td->options & NAND_BBT_PERCHIP) { - chip = (int)(offs >> this->chip_shift); + chip = (int)(offs >> bbt->chip_shift); chipsel = chip; } else { chip = 0; @@ -1179,13 +1111,13 @@ static int nand_update_bbt(struct mtd_info *mtd, loff_t offs) /* Write the bad block table to the device? */ if (td->options & NAND_BBT_WRITE) { - res = write_bbt(mtd, buf, td, md, chipsel); + res = write_bbt(bbt, buf, td, md, chipsel); if (res < 0) goto out; } /* Write the mirror bad block table to the device? */ if (md && (md->options & NAND_BBT_WRITE)) { - res = write_bbt(mtd, buf, md, td, chipsel); + res = write_bbt(bbt, buf, md, td, chipsel); } out: @@ -1193,12 +1125,6 @@ static int nand_update_bbt(struct mtd_info *mtd, loff_t offs) return res; } -/* - * Define some generic bad / good block scan pattern which are used - * while scanning a device for factory marked good / bad blocks. - */ -static uint8_t scan_ff_pattern[] = { 0xff, 0xff }; - /* Generic flash bbt descriptors */ static uint8_t bbt_pattern[] = {'B', 'b', 't', '0' }; static uint8_t mirror_pattern[] = {'1', 't', 'b', 'B' }; @@ -1243,135 +1169,103 @@ static struct nand_bbt_descr bbt_mirror_no_oob_descr = { .pattern = mirror_pattern }; -#define BADBLOCK_SCAN_MASK (~NAND_BBT_NO_OOB) /** - * nand_create_badblock_pattern - [INTERN] Creates a BBT descriptor structure - * @this: NAND chip to create descriptor for + * nand_bbt_init - [NAND Interface] Initialize and locate/create a bad block + * table * - * This function allocates and initializes a nand_bbt_descr for BBM detection - * based on the properties of @this. The new descriptor is stored in - * this->badblock_pattern. Thus, this->badblock_pattern should be NULL when - * passed to this function. - */ -static int nand_create_badblock_pattern(struct nand_chip *this) -{ - struct nand_bbt_descr *bd; - if (this->badblock_pattern) { - pr_warn("Bad block pattern already allocated; not replacing\n"); - return -EINVAL; - } - bd = kzalloc(sizeof(*bd), GFP_KERNEL); - if (!bd) - return -ENOMEM; - bd->options = this->bbt_options & BADBLOCK_SCAN_MASK; - bd->offs = this->badblockpos; - bd->len = (this->options & NAND_BUSWIDTH_16) ? 2 : 1; - bd->pattern = scan_ff_pattern; - bd->options |= NAND_BBT_DYNAMICSTRUCT; - this->badblock_pattern = bd; - return 0; -} - -/** - * nand_default_bbt - [NAND Interface] Select a default bad block table for the device - * @mtd: MTD device structure + * @bbt: NAND BBT structure * * This function selects the default bad block table support for the device and - * calls the nand_scan_bbt function. + * scans for an existing table, or else creates one. */ -int nand_default_bbt(struct mtd_info *mtd) +int nand_bbt_init(struct nand_bbt *bbt) { - struct nand_chip *this = mtd->priv; - int ret; - /* Is a flash based bad block table requested? */ - if (this->bbt_options & NAND_BBT_USE_FLASH) { + if (bbt->bbt_options & NAND_BBT_USE_FLASH) { /* Use the default pattern descriptors */ - if (!this->bbt_td) { - if (this->bbt_options & NAND_BBT_NO_OOB) { - this->bbt_td = &bbt_main_no_oob_descr; - this->bbt_md = &bbt_mirror_no_oob_descr; + if (!bbt->bbt_td) { + if (bbt->bbt_options & NAND_BBT_NO_OOB) { + bbt->bbt_td = &bbt_main_no_oob_descr; + bbt->bbt_md = &bbt_mirror_no_oob_descr; } else { - this->bbt_td = &bbt_main_descr; - this->bbt_md = &bbt_mirror_descr; + bbt->bbt_td = &bbt_main_descr; + bbt->bbt_md = &bbt_mirror_descr; } } } else { - this->bbt_td = NULL; - this->bbt_md = NULL; + bbt->bbt_td = NULL; + bbt->bbt_md = NULL; } - if (!this->badblock_pattern) { - ret = nand_create_badblock_pattern(this); - if (ret) - return ret; - } + return nand_scan_bbt(bbt); +} +EXPORT_SYMBOL(nand_bbt_init); - return nand_scan_bbt(mtd, this->badblock_pattern); +void nand_bbt_release(struct nand_bbt *bbt) +{ + kfree(bbt->bbt); } +EXPORT_SYMBOL(nand_bbt_release); /** - * nand_isreserved_bbt - [NAND Interface] Check if a block is reserved - * @mtd: MTD device structure + * nand_bbt_isreserved - [NAND Interface] Check if a block is reserved + * @bbt: NAND BBT structure * @offs: offset in the device */ -int nand_isreserved_bbt(struct mtd_info *mtd, loff_t offs) +int nand_bbt_isreserved(struct nand_bbt *bbt, loff_t offs) { - struct nand_chip *this = mtd->priv; int block; - block = (int)(offs >> this->bbt_erase_shift); - return bbt_get_entry(this, block) == BBT_BLOCK_RESERVED; + block = (int)(offs >> bbt->bbt_erase_shift); + return bbt_get_entry(bbt, block) == BBT_BLOCK_RESERVED; } +EXPORT_SYMBOL(nand_bbt_isreserved); /** - * nand_isbad_bbt - [NAND Interface] Check if a block is bad - * @mtd: MTD device structure + * nand_bbt_isbad - [NAND Interface] Check if a block is bad + * @bbt: NAND BBT structure * @offs: offset in the device - * @allowbbt: allow access to bad block table region */ -int nand_isbad_bbt(struct mtd_info *mtd, loff_t offs, int allowbbt) +int nand_bbt_isbad(struct nand_bbt *bbt, loff_t offs) { - struct nand_chip *this = mtd->priv; int block, res; - block = (int)(offs >> this->bbt_erase_shift); - res = bbt_get_entry(this, block); + block = (int)(offs >> bbt->bbt_erase_shift); + res = bbt_get_entry(bbt, block); - pr_debug("nand_isbad_bbt(): bbt info for offs 0x%08x: (block %d) 0x%02x\n", + pr_debug("nand_bbt_isbad(): bbt info for offs 0x%08x: (block %d) 0x%02x\n", (unsigned int)offs, block, res); switch (res) { case BBT_BLOCK_GOOD: + case BBT_BLOCK_RESERVED: return 0; case BBT_BLOCK_WORN: + case BBT_BLOCK_FACTORY_BAD: + default: return 1; - case BBT_BLOCK_RESERVED: - return allowbbt ? 0 : 1; } - return 1; } +EXPORT_SYMBOL(nand_bbt_isbad); /** - * nand_markbad_bbt - [NAND Interface] Mark a block bad in the BBT - * @mtd: MTD device structure + * nand_bbt_markbad - [NAND Interface] Mark a block bad in the BBT + * @bbt: NAND BBT structure * @offs: offset of the bad block */ -int nand_markbad_bbt(struct mtd_info *mtd, loff_t offs) +int nand_bbt_markbad(struct nand_bbt *bbt, loff_t offs) { - struct nand_chip *this = mtd->priv; int block, ret = 0; - block = (int)(offs >> this->bbt_erase_shift); + block = (int)(offs >> bbt->bbt_erase_shift); /* Mark bad block in memory */ - bbt_mark_entry(this, block, BBT_BLOCK_WORN); + bbt_mark_entry(bbt, block, BBT_BLOCK_WORN); /* Update flash-based bad block table */ - if (this->bbt_options & NAND_BBT_USE_FLASH) - ret = nand_update_bbt(mtd, offs); + if (bbt->bbt_options & NAND_BBT_USE_FLASH) + ret = nand_update_bbt(bbt, offs); return ret; } - -EXPORT_SYMBOL(nand_scan_bbt); +EXPORT_SYMBOL(nand_bbt_markbad); diff --git a/include/linux/mtd/bbm.h b/include/linux/mtd/bbm.h index 36bb6a5..fb751d9 100644 --- a/include/linux/mtd/bbm.h +++ b/include/linux/mtd/bbm.h @@ -28,102 +28,8 @@ #ifndef __LINUX_MTD_BBM_H #define __LINUX_MTD_BBM_H -/* The maximum number of NAND chips in an array */ -#define NAND_MAX_CHIPS 8 +#include -/** - * struct nand_bbt_descr - bad block table descriptor - * @options: options for this descriptor - * @pages: the page(s) where we find the bbt, used with option BBT_ABSPAGE - * when bbt is searched, then we store the found bbts pages here. - * Its an array and supports up to 8 chips now - * @offs: offset of the pattern in the oob area of the page - * @veroffs: offset of the bbt version counter in the oob are of the page - * @version: version read from the bbt page during scan - * @len: length of the pattern, if 0 no pattern check is performed - * @maxblocks: maximum number of blocks to search for a bbt. This number of - * blocks is reserved at the end of the device where the tables are - * written. - * @reserved_block_code: if non-0, this pattern denotes a reserved (rather than - * bad) block in the stored bbt - * @pattern: pattern to identify bad block table or factory marked good / - * bad blocks, can be NULL, if len = 0 - * - * Descriptor for the bad block table marker and the descriptor for the - * pattern which identifies good and bad blocks. The assumption is made - * that the pattern and the version count are always located in the oob area - * of the first block. - */ -struct nand_bbt_descr { - int options; - int pages[NAND_MAX_CHIPS]; - int offs; - int veroffs; - uint8_t version[NAND_MAX_CHIPS]; - int len; - int maxblocks; - int reserved_block_code; - uint8_t *pattern; -}; - -/* Options for the bad block table descriptors */ - -/* The number of bits used per block in the bbt on the device */ -#define NAND_BBT_NRBITS_MSK 0x0000000F -#define NAND_BBT_1BIT 0x00000001 -#define NAND_BBT_2BIT 0x00000002 -#define NAND_BBT_4BIT 0x00000004 -#define NAND_BBT_8BIT 0x00000008 -/* The bad block table is in the last good block of the device */ -#define NAND_BBT_LASTBLOCK 0x00000010 -/* The bbt is at the given page, else we must scan for the bbt */ -#define NAND_BBT_ABSPAGE 0x00000020 -/* bbt is stored per chip on multichip devices */ -#define NAND_BBT_PERCHIP 0x00000080 -/* bbt has a version counter at offset veroffs */ -#define NAND_BBT_VERSION 0x00000100 -/* Create a bbt if none exists */ -#define NAND_BBT_CREATE 0x00000200 -/* - * Create an empty BBT with no vendor information. Vendor's information may be - * unavailable, for example, if the NAND controller has a different data and OOB - * layout or if this information is already purged. Must be used in conjunction - * with NAND_BBT_CREATE. - */ -#define NAND_BBT_CREATE_EMPTY 0x00000400 -/* Write bbt if neccecary */ -#define NAND_BBT_WRITE 0x00002000 -/* Read and write back block contents when writing bbt */ -#define NAND_BBT_SAVECONTENT 0x00004000 -/* Search good / bad pattern on the first and the second page */ -#define NAND_BBT_SCAN2NDPAGE 0x00008000 -/* Search good / bad pattern on the last page of the eraseblock */ -#define NAND_BBT_SCANLASTPAGE 0x00010000 -/* - * Use a flash based bad block table. By default, OOB identifier is saved in - * OOB area. This option is passed to the default bad block table function. - */ -#define NAND_BBT_USE_FLASH 0x00020000 -/* - * Do not store flash based bad block table marker in the OOB area; store it - * in-band. - */ -#define NAND_BBT_NO_OOB 0x00040000 -/* - * Do not write new bad block markers to OOB; useful, e.g., when ECC covers - * entire spare area. Must be used with NAND_BBT_USE_FLASH. - */ -#define NAND_BBT_NO_OOB_BBM 0x00080000 - -/* - * Flag set by nand_create_default_bbt_descr(), marking that the nand_bbt_descr - * was allocated dynamicaly and must be freed in nand_release(). Has no meaning - * in nand_chip.bbt_options. - */ -#define NAND_BBT_DYNAMICSTRUCT 0x80000000 - -/* The maximum number of blocks to scan for a bbt */ -#define NAND_BBT_SCAN_MAXBLOCKS 4 /* * Constants for oob configuration diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h index f25e2bd..cd1abb71 100644 --- a/include/linux/mtd/nand.h +++ b/include/linux/mtd/nand.h @@ -194,6 +194,12 @@ typedef enum { /* Nand scan has allocated controller struct */ #define NAND_CONTROLLER_ALLOC 0x80000000 +/* + * Flag to mark that the badblock_pattern is allocated dynamicaly and must + * be freed in nand_release(). + */ +#define NAND_BADBLOCK_PATTERN_ALLOC 0x08000000 + /* Cell info constants */ #define NAND_CI_CHIPNR_MSK 0x03 #define NAND_CI_CELLTYPE_MSK 0x0C @@ -627,7 +633,8 @@ struct nand_buffers { * @read_retries: [INTERN] the number of read retry modes supported * @onfi_set_features: [REPLACEABLE] set the features for ONFI nand * @onfi_get_features: [REPLACEABLE] get the features for ONFI nand - * @bbt: [INTERN] bad block table pointer + * @nand_bbt: [INTERN] pointer to bad block table structure, which includes + * all information needed by Bad Block Management * @bbt_td: [REPLACEABLE] bad block table descriptor for flash * lookup. * @bbt_md: [REPLACEABLE] bad block table mirror descriptor @@ -716,7 +723,7 @@ struct nand_chip { struct nand_buffers *buffers; struct nand_hw_control hwcontrol; - uint8_t *bbt; + struct nand_bbt *nand_bbt; struct nand_bbt_descr *bbt_td; struct nand_bbt_descr *bbt_md; @@ -838,12 +845,9 @@ struct nand_manufacturers { extern struct nand_flash_dev nand_flash_ids[]; extern struct nand_manufacturers nand_manuf_ids[]; -extern int nand_default_bbt(struct mtd_info *mtd); extern int nand_markbad_bbt(struct mtd_info *mtd, loff_t offs); extern int nand_isreserved_bbt(struct mtd_info *mtd, loff_t offs); extern int nand_isbad_bbt(struct mtd_info *mtd, loff_t offs, int allowbbt); -extern int nand_erase_nand(struct mtd_info *mtd, struct erase_info *instr, - int allowbbt); extern int nand_do_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, uint8_t *buf); diff --git a/include/linux/mtd/nand_bbt.h b/include/linux/mtd/nand_bbt.h new file mode 100644 index 0000000..1a68104 --- /dev/null +++ b/include/linux/mtd/nand_bbt.h @@ -0,0 +1,172 @@ +/* + * NAND family Bad Block Table support + * + * Copyright ? 2015 Broadcom Corporation + * Brian Norris + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ +#ifndef __LINUX_MTD_NAND_BBT_H +#define __LINUX_MTD_NAND_BBT_H + +struct mtd_info; + +/* The maximum number of NAND chips in an array */ +#define NAND_MAX_CHIPS 8 + +/** + * struct nand_bbt_descr - bad block table descriptor + * @options: options for this descriptor + * @pages: the page(s) where we find the bbt, used with option BBT_ABSPAGE + * when bbt is searched, then we store the found bbts pages here. + * Its an array and supports up to 8 chips now + * @offs: offset of the pattern in the oob area of the page + * @veroffs: offset of the bbt version counter in the oob are of the page + * @version: version read from the bbt page during scan + * @len: length of the pattern, if 0 no pattern check is performed + * @maxblocks: maximum number of blocks to search for a bbt. This number of + * blocks is reserved at the end of the device where the tables are + * written. + * @reserved_block_code: if non-0, this pattern denotes a reserved (rather than + * bad) block in the stored bbt + * @pattern: pattern to identify bad block table or factory marked good / + * bad blocks, can be NULL, if len = 0 + * + * Descriptor for the bad block table marker and the descriptor for the + * pattern which identifies good and bad blocks. The assumption is made + * that the pattern and the version count are always located in the oob area + * of the first block. + */ +struct nand_bbt_descr { + int options; + int pages[NAND_MAX_CHIPS]; + int offs; + int veroffs; + uint8_t version[NAND_MAX_CHIPS]; + int len; + int maxblocks; + int reserved_block_code; + uint8_t *pattern; +}; + +/* Options for the bad block table descriptors */ + +/* The number of bits used per block in the bbt on the device */ +#define NAND_BBT_NRBITS_MSK 0x0000000F +#define NAND_BBT_1BIT 0x00000001 +#define NAND_BBT_2BIT 0x00000002 +#define NAND_BBT_4BIT 0x00000004 +#define NAND_BBT_8BIT 0x00000008 +/* The bad block table is in the last good block of the device */ +#define NAND_BBT_LASTBLOCK 0x00000010 +/* The bbt is at the given page, else we must scan for the bbt */ +#define NAND_BBT_ABSPAGE 0x00000020 +/* bbt is stored per chip on multichip devices */ +#define NAND_BBT_PERCHIP 0x00000080 +/* bbt has a version counter at offset veroffs */ +#define NAND_BBT_VERSION 0x00000100 +/* Create a bbt if none exists */ +#define NAND_BBT_CREATE 0x00000200 +/* + * Create an empty BBT with no vendor information. Vendor's information may be + * unavailable, for example, if the NAND controller has a different data and OOB + * layout or if this information is already purged. Must be used in conjunction + * with NAND_BBT_CREATE. + */ +#define NAND_BBT_CREATE_EMPTY 0x00000400 +/* Write bbt if necessary */ +#define NAND_BBT_WRITE 0x00002000 +/* Read and write back block contents when writing bbt */ +#define NAND_BBT_SAVECONTENT 0x00004000 +/* Search good / bad pattern on the first and the second page */ +#define NAND_BBT_SCAN2NDPAGE 0x00008000 +/* Search good / bad pattern on the last page of the eraseblock */ +#define NAND_BBT_SCANLASTPAGE 0x00010000 +/* + * Use a flash based bad block table. By default, OOB identifier is saved in + * OOB area. This option is passed to the default bad block table function. + */ +#define NAND_BBT_USE_FLASH 0x00020000 +/* + * Do not store flash based bad block table marker in the OOB area; store it + * in-band. + */ +#define NAND_BBT_NO_OOB 0x00040000 +/* + * Do not write new bad block markers to OOB; useful, e.g., when ECC covers + * entire spare area. Must be used with NAND_BBT_USE_FLASH. + */ +#define NAND_BBT_NO_OOB_BBM 0x00080000 + +/* The maximum number of blocks to scan for a bbt */ +#define NAND_BBT_SCAN_MAXBLOCKS 4 + +/** + * struct nand_bbt - bad block table structure + * @mtd: pointer to MTD device structure + * @is_bad_bbm: check if a block is factory bad block + * @mark_bad_bbm: imitate a block as factory bad block + * @erase: erase block bypassing resvered checks + * @bbt_options: bad block specific options. All options used + * here must come from nand_bbt.h. + * @numchips: number of physical chips, required for NAND_BBT_PERCHIP + * @bbt_td: bad block table descriptor for flash lookup. + * @bbt_md: bad block table mirror descriptor + * @chipsize: the size of one chip for multichip arrays + * @chip_shift: number of address bits in one chip + * @bbt_erase_shift: number of address bits in a bbt entry + * @page_shift: number of address bits in a page + * @bbt: bad block table pointer + * + */ +struct nand_bbt { + struct mtd_info *mtd; + + /* + * This is important to abstract out of nand_bbt.c and provide + * separately in nand_base.c and spi-nand-base.c -- it's sort of + * duplicated in nand_block_bad() (nand_base) and + * scan_block_fast() (nand_bbt) right now + * + * Note that this also means nand_chip.badblock_pattern should + * be removed from nand_bbt.c + */ + int (*is_bad_bbm)(struct mtd_info *mtd, loff_t ofs); + + /* Only required if the driver wants to attempt to program new + * bad block markers that imitate the factory-marked BBMs */ + int (*mark_bad_bbm)(struct mtd_info *mtd, loff_t ofs); + + /* Erase a block, bypassing reserved checks */ + int (*erase)(struct mtd_info *mtd, loff_t ofs); + + unsigned int bbt_options; + int numchips; + + /* Discourage new customer usages here; suggest usage of the + * relevant NAND_BBT_* options instead */ + struct nand_bbt_descr *bbt_td; + struct nand_bbt_descr *bbt_md; + u64 chipsize; + int chip_shift; + int bbt_erase_shift; + int page_shift; + u8 *bbt; +}; + +int nand_bbt_init(struct nand_bbt *bbt); +void nand_bbt_release(struct nand_bbt *bbt); +int nand_bbt_markbad(struct nand_bbt *bbt, loff_t offs); +int nand_bbt_isreserved(struct nand_bbt *bbt, loff_t offs); +int nand_bbt_isbad(struct nand_bbt *bbt, loff_t offs); + +#endif /* __LINUX_MTD_NAND_BBT_H */