X-Git-Url: https://git.kernelconcepts.de/?a=blobdiff_plain;f=drivers%2Fmtd%2Fnand%2Fnand_bbt.c;h=8ef58451d522131ba3b9bec3c116531c94217681;hb=5a34d9bf31a021987f97f20aefa812b97b58584e;hp=19a9bc2a5b6cdc6469118545fa2fdc0cfd80f5d0;hpb=f743931f9b4d4e15c9bdfe726bef033ea1f1402c;p=karo-tx-uboot.git diff --git a/drivers/mtd/nand/nand_bbt.c b/drivers/mtd/nand/nand_bbt.c index 19a9bc2a5b..8ef58451d5 100644 --- a/drivers/mtd/nand/nand_bbt.c +++ b/drivers/mtd/nand/nand_bbt.c @@ -4,9 +4,7 @@ * Overview: * Bad block table support for the NAND driver * - * Copyright (C) 2004 Thomas Gleixner (tglx@linutronix.de) - * - * $Id: nand_bbt.c,v 1.28 2004/11/13 10:19:09 gleixner Exp $ + * Copyright © 2004 Thomas Gleixner (tglx@linutronix.de) * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as @@ -15,28 +13,37 @@ * Description: * * When nand_scan_bbt is called, then it tries to find the bad block table - * depending on the options in the bbt descriptor(s). If a bbt is found - * then the contents are read and the memory based bbt is created. If a - * mirrored bbt is selected then the mirror is searched too and the - * versions are compared. If the mirror has a greater version number - * than the mirror bbt is used to build the memory based bbt. + * depending on the options in the BBT descriptor(s). If no flash based BBT + * (NAND_BBT_USE_FLASH) is specified then the device is scanned for factory + * marked good / bad blocks. This information is used to create a memory BBT. + * Once a new bad block is discovered then the "factory" information is updated + * on the device. + * If a flash based BBT is specified then the function first tries to find the + * BBT on flash. If a BBT is found then the contents are read and the memory + * based BBT is created. If a mirrored BBT is selected then the mirror is + * searched too and the versions are compared. If the mirror has a greater + * version number, then the mirror BBT is used to build the memory based BBT. * If the tables are not versioned, then we "or" the bad block information. - * If one of the bbt's is out of date or does not exist it is (re)created. - * If no bbt exists at all then the device is scanned for factory marked + * If one of the BBTs is out of date or does not exist it is (re)created. + * If no BBT exists at all then the device is scanned for factory marked * good / bad blocks and the bad block tables are created. * - * For manufacturer created bbts like the one found on M-SYS DOC devices - * the bbt is searched and read but never created + * For manufacturer created BBTs like the one found on M-SYS DOC devices + * the BBT is searched and read but never created * - * The autogenerated bad block table is located in the last good blocks + * The auto generated bad block table is located in the last good blocks * of the device. The table is mirrored, so it can be updated eventually. - * The table is marked in the oob area with an ident pattern and a version - * number which indicates which of both tables is more up to date. + * The table is marked in the OOB area with an ident pattern and a version + * number which indicates which of both tables is more up to date. If the NAND + * controller needs the complete OOB area for the ECC information then the + * option NAND_BBT_NO_OOB should be used (along with NAND_BBT_USE_FLASH, of + * course): it moves the ident pattern and the version byte into the data area + * and the OOB area will remain untouched. * * The table uses 2 bits per block - * 11b: block is good - * 00b: block is factory marked bad - * 01b, 10b: block is marked bad due to wear + * 11b: block is good + * 00b: block is factory marked bad + * 01b, 10b: block is marked bad due to wear * * The memory bad block table uses the following scheme: * 00b: block is good @@ -48,99 +55,155 @@ * * Following assumptions are made: * - bbts start at a page boundary, if autolocated on a block boundary - * - the space neccecary for a bbt in FLASH does not exceed a block boundary + * - the space necessary for a bbt in FLASH does not exceed a block boundary * */ #include - -#if defined(CONFIG_CMD_NAND) && !defined(CFG_NAND_LEGACY) - #include -#include +#include #include +#include #include +#include +#include +#include #include +static int check_pattern_no_oob(uint8_t *buf, struct nand_bbt_descr *td) +{ + if (memcmp(buf, td->pattern, td->len)) + return -1; + return 0; +} + /** * check_pattern - [GENERIC] check if a pattern is in the buffer - * @buf: the buffer to search - * @len: the length of buffer to search - * @paglen: the pagelength - * @td: search pattern descriptor - * - * Check for a pattern at the given place. Used to search bad block - * tables and good / bad block identifiers. - * If the SCAN_EMPTY option is set then check, if all bytes except the - * pattern area contain 0xff + * @buf: the buffer to search + * @len: the length of buffer to search + * @paglen: the pagelength + * @td: search pattern descriptor * -*/ -static int check_pattern (uint8_t *buf, int len, int paglen, struct nand_bbt_descr *td) + * Check for a pattern at the given place. Used to search bad block tables and + * good / bad block identifiers. If the SCAN_EMPTY option is set then check, if + * all bytes except the pattern area contain 0xff. + */ +static int check_pattern(uint8_t *buf, int len, int paglen, struct nand_bbt_descr *td) { - int i, end; + int end = 0; uint8_t *p = buf; + if (td->options & NAND_BBT_NO_OOB) + return check_pattern_no_oob(buf, td); + end = paglen + td->offs; - if (td->options & NAND_BBT_SCANEMPTY) { - for (i = 0; i < end; i++) { - if (p[i] != 0xff) - return -1; - } - } + if (td->options & NAND_BBT_SCANEMPTY) + if (memchr_inv(p, 0xff, end)) + return -1; p += end; /* Compare the pattern */ - for (i = 0; i < td->len; i++) { - if (p[i] != td->pattern[i]) - return -1; - } + if (memcmp(p, td->pattern, td->len)) + return -1; - p += td->len; - end += td->len; if (td->options & NAND_BBT_SCANEMPTY) { - for (i = end; i < len; i++) { - if (*p++ != 0xff) - return -1; - } + p += td->len; + end += td->len; + if (memchr_inv(p, 0xff, len - end)) + return -1; } return 0; } +/** + * 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 + * + * The length will be 0 if the marker is located in OOB area. + */ +static u32 add_marker_len(struct nand_bbt_descr *td) +{ + u32 len; + + if (!(td->options & NAND_BBT_NO_OOB)) + return 0; + + len = td->len; + if (td->options & NAND_BBT_VERSION) + len++; + return len; +} + /** * read_bbt - [GENERIC] Read the bad block table starting from page - * @mtd: MTD device structure - * @buf: temporary buffer - * @page: the starting page - * @num: the number of bbt descriptors to read - * @bits: number of bits per block - * @offs: offset in the memory table - * @reserved_block_code: Pattern to identify reserved blocks + * @mtd: MTD device structure + * @buf: temporary buffer + * @page: the starting page + * @num: the number of bbt descriptors to read + * @td: the bbt describtion table + * @offs: offset in the memory table * * Read the bad block table starting from page. - * */ -static int read_bbt (struct mtd_info *mtd, uint8_t *buf, int page, int num, - int bits, int offs, int reserved_block_code) +static int read_bbt(struct mtd_info *mtd, uint8_t *buf, int page, int num, + struct nand_bbt_descr *td, int offs) { - int res, i, j, act = 0; + int res, ret = 0, i, j, act = 0; struct nand_chip *this = mtd->priv; size_t retlen, len, totlen; loff_t from; - uint8_t msk = (uint8_t) ((1 << bits) - 1); + int bits = td->options & NAND_BBT_NRBITS_MSK; + uint8_t msk = (uint8_t)((1 << bits) - 1); + u32 marker_len; + int reserved_block_code = td->reserved_block_code; totlen = (num * bits) >> 3; + marker_len = add_marker_len(td); from = ((loff_t)page) << this->page_shift; while (totlen) { - len = min (totlen, (size_t) (1 << this->bbt_erase_shift)); - res = mtd->read_ecc (mtd, from, len, &retlen, buf, NULL, this->autooob); + len = min(totlen, (size_t)(1 << this->bbt_erase_shift)); + if (marker_len) { + /* + * In case the BBT marker is not in the OOB area it + * will be just in the first page. + */ + len -= marker_len; + from += marker_len; + marker_len = 0; + } + res = mtd_read(mtd, from, len, &retlen, buf); if (res < 0) { - if (retlen != len) { - printk (KERN_INFO "nand_bbt: Error reading bad block table\n"); + if (mtd_is_eccerr(res)) { + pr_info("nand_bbt: ECC error in BBT at " + "0x%012llx\n", from & ~mtd->writesize); + return res; + } else if (mtd_is_bitflip(res)) { + pr_info("nand_bbt: corrected error in BBT at " + "0x%012llx\n", from & ~mtd->writesize); + ret = res; + } else { + pr_info("nand_bbt: error reading BBT\n"); return res; } - printk (KERN_WARNING "nand_bbt: ECC error while reading bad block table\n"); } /* Analyse data */ @@ -150,195 +213,362 @@ static int read_bbt (struct mtd_info *mtd, uint8_t *buf, int page, int num, uint8_t tmp = (dat >> j) & msk; if (tmp == msk) continue; - if (reserved_block_code && - (tmp == reserved_block_code)) { - printk (KERN_DEBUG "nand_read_bbt: Reserved block at 0x%08x\n", - ((offs << 2) + (act >> 1)) << this->bbt_erase_shift); + if (reserved_block_code && (tmp == reserved_block_code)) { + pr_info("nand_read_bbt: reserved block at 0x%012llx\n", + (loff_t)((offs << 2) + (act >> 1)) << this->bbt_erase_shift); this->bbt[offs + (act >> 3)] |= 0x2 << (act & 0x06); + mtd->ecc_stats.bbtblocks++; continue; } - /* Leave it for now, if its matured we can move this - * message to MTD_DEBUG_LEVEL0 */ - printk (KERN_DEBUG "nand_read_bbt: Bad block at 0x%08x\n", - ((offs << 2) + (act >> 1)) << this->bbt_erase_shift); - /* Factory marked bad or worn out ? */ + pr_info("nand_read_bbt: Bad block at 0x%012llx\n", + (loff_t)((offs << 2) + (act >> 1)) + << this->bbt_erase_shift); + /* Factory marked bad or worn out? */ if (tmp == 0) this->bbt[offs + (act >> 3)] |= 0x3 << (act & 0x06); else this->bbt[offs + (act >> 3)] |= 0x1 << (act & 0x06); + mtd->ecc_stats.badblocks++; } } totlen -= len; from += len; } - return 0; + return ret; } /** * read_abs_bbt - [GENERIC] Read the bad block table starting at a given page - * @mtd: MTD device 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 NAND_BBT_PERCHIP option is set + * @mtd: MTD device 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 + * NAND_BBT_PERCHIP option is set * - * 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) + * 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) { struct nand_chip *this = mtd->priv; int res = 0, i; - int bits; - bits = td->options & NAND_BBT_NRBITS_MSK; if (td->options & NAND_BBT_PERCHIP) { int offs = 0; for (i = 0; i < this->numchips; i++) { if (chip == -1 || chip == i) - res = read_bbt (mtd, buf, td->pages[i], this->chipsize >> this->bbt_erase_shift, bits, offs, td->reserved_block_code); + res = read_bbt(mtd, buf, td->pages[i], + this->chipsize >> this->bbt_erase_shift, + td, offs); if (res) return res; offs += this->chipsize >> (this->bbt_erase_shift + 2); } } else { - res = read_bbt (mtd, buf, td->pages[0], mtd->size >> this->bbt_erase_shift, bits, 0, td->reserved_block_code); + res = read_bbt(mtd, buf, td->pages[0], + mtd->size >> this->bbt_erase_shift, td, 0); if (res) return res; } return 0; } +/* BBT marker is in the first page, no OOB */ +static int scan_read_data(struct mtd_info *mtd, uint8_t *buf, loff_t offs, + struct nand_bbt_descr *td) +{ + size_t retlen; + size_t len; + + len = td->len; + if (td->options & NAND_BBT_VERSION) + len++; + + return mtd_read(mtd, offs, len, &retlen, buf); +} + /** - * read_abs_bbts - [GENERIC] Read the bad block table(s) for all chips starting at a given page - * @mtd: MTD device structure - * @buf: temporary buffer - * @td: descriptor for the bad block table - * @md: descriptor for the bad block table mirror + * scan_read_oob - [GENERIC] Scan data+OOB region to buffer + * @mtd: MTD device structure + * @buf: temporary buffer + * @offs: offset at which to scan + * @len: length of data region to read * - * Read the bad block table(s) for all chips starting at a given page - * We assume that the bbt bits are in consecutive order. + * Scan read data from data+OOB. May traverse multiple pages, interleaving + * 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, + size_t len) +{ + struct mtd_oob_ops ops; + int res, ret = 0; + + ops.mode = MTD_OPS_PLACE_OOB; + ops.ooboffs = 0; + ops.ooblen = mtd->oobsize; + + while (len > 0) { + ops.datbuf = buf; + ops.len = min(len, (size_t)mtd->writesize); + ops.oobbuf = buf + ops.len; + + res = mtd_read_oob(mtd, offs, &ops); + if (res) { + if (!mtd_is_bitflip_or_eccerr(res)) + return res; + else if (mtd_is_eccerr(res) || !ret) + ret = res; + } + + buf += mtd->oobsize + mtd->writesize; + len -= mtd->writesize; + offs += mtd->writesize; + } + return ret; +} + +static int scan_read(struct mtd_info *mtd, 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); + else + return scan_read_oob(mtd, 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, + uint8_t *buf, uint8_t *oob) +{ + struct mtd_oob_ops ops; + + ops.mode = MTD_OPS_PLACE_OOB; + ops.ooboffs = 0; + ops.ooblen = mtd->oobsize; + ops.datbuf = buf; + ops.oobbuf = oob; + ops.len = len; + + return mtd_write_oob(mtd, offs, &ops); +} + +static u32 bbt_get_ver_offs(struct mtd_info *mtd, struct nand_bbt_descr *td) +{ + u32 ver_offs = td->veroffs; + + if (!(td->options & NAND_BBT_NO_OOB)) + ver_offs += 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 + * @buf: temporary buffer + * @td: descriptor for the bad block table + * @md: descriptor for the bad block table mirror * -*/ -static int read_abs_bbts (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td, - struct nand_bbt_descr *md) + * 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, + struct nand_bbt_descr *td, struct nand_bbt_descr *md) { struct nand_chip *this = mtd->priv; /* Read the primary version, if available */ if (td->options & NAND_BBT_VERSION) { - nand_read_raw (mtd, buf, td->pages[0] << this->page_shift, mtd->oobblock, mtd->oobsize); - td->version[0] = buf[mtd->oobblock + td->veroffs]; - printk (KERN_DEBUG "Bad block table at page %d, version 0x%02X\n", td->pages[0], td->version[0]); + scan_read(mtd, buf, (loff_t)td->pages[0] << this->page_shift, + mtd->writesize, td); + td->version[0] = buf[bbt_get_ver_offs(mtd, 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)) { - nand_read_raw (mtd, buf, md->pages[0] << this->page_shift, mtd->oobblock, mtd->oobsize); - md->version[0] = buf[mtd->oobblock + md->veroffs]; - printk (KERN_DEBUG "Bad block table at page %d, version 0x%02X\n", md->pages[0], md->version[0]); + scan_read(mtd, buf, (loff_t)md->pages[0] << this->page_shift, + mtd->writesize, md); + md->version[0] = buf[bbt_get_ver_offs(mtd, md)]; + pr_info("Bad block table at page %d, version 0x%02X\n", + md->pages[0], md->version[0]); } +} - return 1; +/* Scan a given block full */ +static int scan_block_full(struct mtd_info *mtd, struct nand_bbt_descr *bd, + loff_t offs, uint8_t *buf, size_t readlen, + int scanlen, int numpages) +{ + int ret, j; + + ret = scan_read_oob(mtd, buf, offs, readlen); + /* Ignore ECC errors when checking for BBM */ + if (ret && !mtd_is_bitflip_or_eccerr(ret)) + return ret; + + for (j = 0; j < numpages; j++, buf += scanlen) { + if (check_pattern(buf, scanlen, mtd->writesize, bd)) + return 1; + } + return 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 - * @chip: create the table for a specific chip, -1 read all chips. - * Applies only if NAND_BBT_PERCHIP option is set + * @mtd: MTD device structure + * @buf: temporary buffer + * @bd: descriptor for the good/bad block search pattern + * @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 + * Create a bad block table by scanning the device for the given good/bad block + * identify pattern. */ -static void create_bbt (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *bd, int chip) +static int create_bbt(struct mtd_info *mtd, uint8_t *buf, + struct nand_bbt_descr *bd, int chip) { struct nand_chip *this = mtd->priv; - int i, j, numblocks, len, scanlen; + int i, numblocks, numpages, scanlen; int startblock; loff_t from; - size_t readlen, ooblen; + size_t readlen; + + pr_info("Scanning device for bad blocks\n"); if (bd->options & NAND_BBT_SCANALLPAGES) - len = 1 << (this->bbt_erase_shift - this->page_shift); - else { - if (bd->options & NAND_BBT_SCAN2NDPAGE) - len = 2; - else - len = 1; + numpages = 1 << (this->bbt_erase_shift - this->page_shift); + else if (bd->options & NAND_BBT_SCAN2NDPAGE) + numpages = 2; + else + numpages = 1; + + if (!(bd->options & NAND_BBT_SCANEMPTY)) { + /* We need only read few bytes from the OOB area */ + scanlen = 0; + readlen = bd->len; + } else { + /* Full page content should be read */ + scanlen = mtd->writesize + mtd->oobsize; + readlen = numpages * mtd->writesize; } - scanlen = mtd->oobblock + mtd->oobsize; - readlen = len * mtd->oobblock; - ooblen = len * mtd->oobsize; if (chip == -1) { - /* Note that numblocks is 2 * (real numblocks) here, see i+=2 below as it - * makes shifting and masking less painful */ + /* + * Note that numblocks is 2 * (real numblocks) here, see i+=2 + * below as it makes shifting and masking less painful + */ numblocks = mtd->size >> (this->bbt_erase_shift - 1); startblock = 0; from = 0; } else { if (chip >= this->numchips) { - printk (KERN_WARNING "create_bbt(): chipnr (%d) > available chips (%d)\n", - chip + 1, this->numchips); - return; + pr_warn("create_bbt(): chipnr (%d) > available chips (%d)\n", + chip + 1, this->numchips); + return -EINVAL; } numblocks = this->chipsize >> (this->bbt_erase_shift - 1); startblock = chip * numblocks; numblocks += startblock; - from = startblock << (this->bbt_erase_shift - 1); + from = (loff_t)startblock << (this->bbt_erase_shift - 1); } + if (this->bbt_options & NAND_BBT_SCANLASTPAGE) + from += mtd->erasesize - (mtd->writesize * numpages); + for (i = startblock; i < numblocks;) { - nand_read_raw (mtd, buf, from, readlen, ooblen); - for (j = 0; j < len; j++) { - if (check_pattern (&buf[j * scanlen], scanlen, mtd->oobblock, bd)) { - this->bbt[i >> 3] |= 0x03 << (i & 0x6); - break; - } + int ret; + + BUG_ON(bd->options & NAND_BBT_NO_OOB); + + if (bd->options & NAND_BBT_SCANALLPAGES) + ret = scan_block_full(mtd, bd, from, buf, readlen, + scanlen, numpages); + else + ret = scan_block_fast(mtd, bd, from, buf, numpages); + + if (ret < 0) + return ret; + + if (ret) { + this->bbt[i >> 3] |= 0x03 << (i & 0x6); + pr_warn("Bad eraseblock %d at 0x%012llx\n", + i >> 1, (unsigned long long)from); + mtd->ecc_stats.badblocks++; } + i += 2; from += (1 << this->bbt_erase_shift); } + return 0; } /** * search_bbt - [GENERIC] scan the device for a specific bad block table - * @mtd: MTD device structure - * @buf: temporary buffer - * @td: descriptor for the bad block table + * @mtd: MTD device structure + * @buf: temporary buffer + * @td: descriptor for the bad block table * - * Read the bad block table by searching for a given ident pattern. - * Search is preformed either from the beginning up or from the end of - * the device downwards. The search starts always at the start of a - * block. - * If the option NAND_BBT_PERCHIP is given, each chip is searched - * for a bbt, which contains the bad block information of this chip. - * This is neccecary to provide support for certain DOC devices. + * Read the bad block table by searching for a given ident pattern. Search is + * preformed either from the beginning up or from the end of the device + * downwards. The search starts always at the start of a block. If the option + * NAND_BBT_PERCHIP is given, each chip is searched for a bbt, which contains + * the bad block information of this chip. This is necessary to provide support + * for certain DOC devices. * - * The bbt ident pattern resides in the oob area of the first page - * in a block. + * 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 mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td) { struct nand_chip *this = mtd->priv; int i, chips; - int bits, startblock, block, dir; - int scanlen = mtd->oobblock + mtd->oobsize; + int startblock, block, dir; + int scanlen = mtd->writesize + mtd->oobsize; int bbtblocks; + int blocktopage = this->bbt_erase_shift - this->page_shift; - /* Search direction top -> down ? */ + /* Search direction top -> down? */ if (td->options & NAND_BBT_LASTBLOCK) { - startblock = (mtd->size >> this->bbt_erase_shift) -1; + startblock = (mtd->size >> this->bbt_erase_shift) - 1; dir = -1; } else { startblock = 0; dir = 1; } - /* Do we have a bbt per chip ? */ + /* Do we have a bbt per chip? */ if (td->options & NAND_BBT_PERCHIP) { chips = this->numchips; bbtblocks = this->chipsize >> this->bbt_erase_shift; @@ -348,22 +578,23 @@ static int search_bbt (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr bbtblocks = mtd->size >> this->bbt_erase_shift; } - /* Number of bits for each erase block in the bbt */ - bits = td->options & NAND_BBT_NRBITS_MSK; - for (i = 0; i < chips; i++) { /* Reset version information */ td->version[i] = 0; td->pages[i] = -1; /* Scan the maximum number of blocks */ for (block = 0; block < td->maxblocks; block++) { + int actblock = startblock + dir * block; + loff_t offs = (loff_t)actblock << this->bbt_erase_shift; + /* Read first page */ - nand_read_raw (mtd, buf, actblock << this->bbt_erase_shift, mtd->oobblock, mtd->oobsize); - if (!check_pattern(buf, scanlen, mtd->oobblock, td)) { - td->pages[i] = actblock << (this->bbt_erase_shift - this->page_shift); + scan_read(mtd, buf, offs, mtd->writesize, td); + if (!check_pattern(buf, scanlen, mtd->writesize, td)) { + td->pages[i] = actblock << blocktopage; if (td->options & NAND_BBT_VERSION) { - td->version[i] = buf[mtd->oobblock + td->veroffs]; + offs = bbt_get_ver_offs(mtd, td); + td->version[i] = buf[offs]; } break; } @@ -373,69 +604,71 @@ static int search_bbt (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr /* Check, if we found a bbt for each requested chip */ for (i = 0; i < chips; i++) { if (td->pages[i] == -1) - printk (KERN_WARNING "Bad block table not found for chip %d\n", i); + pr_warn("Bad block table not found for chip %d\n", i); else - printk (KERN_DEBUG "Bad block table found at page %d, version 0x%02X\n", td->pages[i], td->version[i]); + pr_info("Bad block table found at page %d, version 0x%02X\n", td->pages[i], + td->version[i]); } return 0; } /** * search_read_bbts - [GENERIC] scan the device for bad block table(s) - * @mtd: MTD device structure - * @buf: temporary buffer - * @td: descriptor for the bad block table - * @md: descriptor for the bad block table mirror + * @mtd: MTD device 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 int search_read_bbts (struct mtd_info *mtd, uint8_t *buf, - struct nand_bbt_descr *td, struct nand_bbt_descr *md) + * Search and read the bad block table(s). + */ +static void search_read_bbts(struct mtd_info *mtd, uint8_t *buf, + struct nand_bbt_descr *td, + struct nand_bbt_descr *md) { /* Search the primary table */ - search_bbt (mtd, buf, td); + search_bbt(mtd, buf, td); /* Search the mirror table */ if (md) - search_bbt (mtd, buf, md); - - /* Force result check */ - return 1; + search_bbt(mtd, buf, md); } - /** * write_bbt - [GENERIC] (Re)write the bad block table + * @mtd: MTD device structure + * @buf: temporary buffer + * @td: descriptor for the bad block table + * @md: descriptor for the bad block table mirror + * @chipsel: selector for a specific chip, -1 for all * - * @mtd: MTD device structure - * @buf: temporary buffer - * @td: descriptor for the bad block table - * @md: descriptor for the bad block table mirror - * @chipsel: selector for a specific chip, -1 for all - * - * (Re)write the bad block table - * -*/ -static int write_bbt (struct mtd_info *mtd, uint8_t *buf, - struct nand_bbt_descr *td, struct nand_bbt_descr *md, int chipsel) + * (Re)write the bad block table. + */ +static int write_bbt(struct mtd_info *mtd, uint8_t *buf, + struct nand_bbt_descr *td, struct nand_bbt_descr *md, + int chipsel) { struct nand_chip *this = mtd->priv; - struct nand_oobinfo oobinfo; struct erase_info einfo; int i, j, res, chip = 0; int bits, startblock, dir, page, offs, numblocks, sft, sftmsk; - int nrchips, bbtoffs, pageoffs; + int nrchips, bbtoffs, pageoffs, ooboffs; uint8_t msk[4]; uint8_t rcode = td->reserved_block_code; size_t retlen, len = 0; loff_t to; + struct mtd_oob_ops ops; + + ops.ooblen = mtd->oobsize; + ops.ooboffs = 0; + ops.datbuf = NULL; + ops.mode = MTD_OPS_PLACE_OOB; if (!rcode) rcode = 0xff; - /* Write bad block table per chip rather than per device ? */ + /* Write bad block table per chip rather than per device? */ if (td->options & NAND_BBT_PERCHIP) { - numblocks = (int) (this->chipsize >> this->bbt_erase_shift); - /* Full device write or specific chip ? */ + numblocks = (int)(this->chipsize >> this->bbt_erase_shift); + /* Full device write or specific chip? */ if (chipsel == -1) { nrchips = this->numchips; } else { @@ -443,14 +676,14 @@ static int write_bbt (struct mtd_info *mtd, uint8_t *buf, chip = chipsel; } } else { - numblocks = (int) (mtd->size >> this->bbt_erase_shift); + numblocks = (int)(mtd->size >> this->bbt_erase_shift); nrchips = 1; } /* Loop through the chips */ for (; chip < nrchips; chip++) { - - /* There was already a version of the table, reuse the page + /* + * There was already a version of the table, reuse the page * This applies for absolute placement too, as we have the * page nr. in td->pages. */ @@ -459,8 +692,10 @@ static int write_bbt (struct mtd_info *mtd, uint8_t *buf, goto write; } - /* Automatic placement of the bad block table */ - /* Search direction top -> down ? */ + /* + * Automatic placement of the bad block table. Search direction + * top -> down? + */ if (td->options & NAND_BBT_LASTBLOCK) { startblock = numblocks * (chip + 1) - 1; dir = -1; @@ -472,151 +707,182 @@ 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 ((this->bbt[block >> 2] >> (2 * (block & 0x03))) & 0x03) { + switch ((this->bbt[block >> 2] >> + (2 * (block & 0x03))) & 0x03) { case 0x01: case 0x03: continue; } - page = block << (this->bbt_erase_shift - this->page_shift); + page = block << + (this->bbt_erase_shift - this->page_shift); /* Check, if the block is used by the mirror table */ if (!md || md->pages[chip] != page) goto write; } - printk (KERN_ERR "No space left to write bad block table\n"); + pr_err("No space left to write bad block table\n"); return -ENOSPC; -write: + write: /* Set up shift count and masks for the flash table */ bits = td->options & NAND_BBT_NRBITS_MSK; + msk[2] = ~rcode; switch (bits) { - case 1: sft = 3; sftmsk = 0x07; msk[0] = 0x00; msk[1] = 0x01; msk[2] = ~rcode; msk[3] = 0x01; break; - case 2: sft = 2; sftmsk = 0x06; msk[0] = 0x00; msk[1] = 0x01; msk[2] = ~rcode; msk[3] = 0x03; break; - case 4: sft = 1; sftmsk = 0x04; msk[0] = 0x00; msk[1] = 0x0C; msk[2] = ~rcode; msk[3] = 0x0f; break; - case 8: sft = 0; sftmsk = 0x00; msk[0] = 0x00; msk[1] = 0x0F; msk[2] = ~rcode; msk[3] = 0xff; break; + case 1: sft = 3; sftmsk = 0x07; msk[0] = 0x00; msk[1] = 0x01; + msk[3] = 0x01; + break; + case 2: sft = 2; sftmsk = 0x06; msk[0] = 0x00; msk[1] = 0x01; + msk[3] = 0x03; + break; + case 4: sft = 1; sftmsk = 0x04; msk[0] = 0x00; msk[1] = 0x0C; + msk[3] = 0x0f; + break; + case 8: sft = 0; sftmsk = 0x00; msk[0] = 0x00; msk[1] = 0x0F; + msk[3] = 0xff; + break; default: return -EINVAL; } bbtoffs = chip * (numblocks >> 2); - to = ((loff_t) page) << this->page_shift; - - memcpy (&oobinfo, this->autooob, sizeof(oobinfo)); - oobinfo.useecc = MTD_NANDECC_PLACEONLY; + to = ((loff_t)page) << this->page_shift; - /* Must we save the block contents ? */ + /* 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)); + to &= ~((loff_t)((1 << this->bbt_erase_shift) - 1)); len = 1 << this->bbt_erase_shift; - res = mtd->read_ecc (mtd, to, len, &retlen, buf, &buf[len], &oobinfo); + res = mtd_read(mtd, to, len, &retlen, buf); if (res < 0) { if (retlen != len) { - printk (KERN_INFO "nand_bbt: Error reading block for writing the bad block table\n"); + pr_info("nand_bbt: error reading block " + "for writing the bad block table\n"); return res; } - printk (KERN_WARNING "nand_bbt: ECC error while reading block for writing bad block table\n"); + 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.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; /* Preset the bbt area with 0xff */ - memset (&buf[offs], 0xff, (size_t)(numblocks >> sft)); - /* Preset the bbt's oob area with 0xff */ - memset (&buf[len + pageoffs * mtd->oobsize], 0xff, - ((len >> this->page_shift) - pageoffs) * mtd->oobsize); - if (td->options & NAND_BBT_VERSION) { - buf[len + (pageoffs * mtd->oobsize) + td->veroffs] = td->version[chip]; - } + memset(&buf[offs], 0xff, (size_t)(numblocks >> sft)); + ooboffs = len + (pageoffs * mtd->oobsize); + + } else if (td->options & NAND_BBT_NO_OOB) { + ooboffs = 0; + offs = td->len; + /* The version byte */ + if (td->options & NAND_BBT_VERSION) + offs++; + /* Calc length */ + len = (size_t)(numblocks >> sft); + len += offs; + /* Make it page aligned! */ + len = ALIGN(len, mtd->writesize); + /* Preset the buffer with 0xff */ + memset(buf, 0xff, len); + /* Pattern is located at the begin of first page */ + memcpy(buf, td->pattern, td->len); } else { /* Calc length */ - len = (size_t) (numblocks >> sft); - /* Make it page aligned ! */ - len = (len + (mtd->oobblock-1)) & ~(mtd->oobblock-1); + len = (size_t)(numblocks >> sft); + /* Make it page aligned! */ + len = ALIGN(len, mtd->writesize); /* Preset the buffer with 0xff */ - memset (buf, 0xff, len + (len >> this->page_shift) * mtd->oobsize); + memset(buf, 0xff, len + + (len >> this->page_shift)* mtd->oobsize); offs = 0; + ooboffs = len; /* Pattern is located in oob area of first page */ - memcpy (&buf[len + td->offs], td->pattern, td->len); - if (td->options & NAND_BBT_VERSION) { - buf[len + td->veroffs] = td->version[chip]; - } + memcpy(&buf[ooboffs + td->offs], td->pattern, td->len); } - /* walk through the memory table */ - for (i = 0; i < numblocks; ) { + if (td->options & NAND_BBT_VERSION) + buf[ooboffs + td->veroffs] = td->version[chip]; + + /* Walk through the memory table */ + for (i = 0; i < numblocks;) { uint8_t dat; dat = this->bbt[bbtoffs + (i >> 2)]; - for (j = 0; j < 4; j++ , i++) { + for (j = 0; j < 4; j++, i++) { int sftcnt = (i << (3 - sft)) & sftmsk; - /* Do not store the reserved bbt blocks ! */ - buf[offs + (i >> sft)] &= ~(msk[dat & 0x03] << sftcnt); + /* Do not store the reserved bbt blocks! */ + buf[offs + (i >> sft)] &= + ~(msk[dat & 0x03] << sftcnt); dat >>= 2; } } - memset (&einfo, 0, sizeof (einfo)); + memset(&einfo, 0, sizeof(einfo)); einfo.mtd = mtd; - einfo.addr = (unsigned long) to; + einfo.addr = to; einfo.len = 1 << this->bbt_erase_shift; - res = nand_erase_nand (mtd, &einfo, 1); - if (res < 0) { - printk (KERN_WARNING "nand_bbt: Error during block erase: %d\n", res); - return res; - } + res = nand_erase_nand(mtd, &einfo, 1); + if (res < 0) + goto outerr; - res = mtd->write_ecc (mtd, to, len, &retlen, buf, &buf[len], &oobinfo); - if (res < 0) { - printk (KERN_WARNING "nand_bbt: Error while writing bad block table %d\n", res); - return res; - } - printk (KERN_DEBUG "Bad block table written to 0x%08x, version 0x%02X\n", - (unsigned int) to, td->version[chip]); + res = scan_write_bbt(mtd, to, len, buf, + td->options & NAND_BBT_NO_OOB ? NULL : + &buf[len]); + if (res < 0) + goto outerr; + + pr_info("Bad block table written to 0x%012llx, version 0x%02X\n", + (unsigned long long)to, td->version[chip]); /* Mark it as used */ td->pages[chip] = page; } return 0; + + outerr: + pr_warn("nand_bbt: error while writing bad block table %d\n", res); + return res; } /** * nand_memory_bbt - [GENERIC] create a memory based bad block table - * @mtd: MTD device structure - * @bd: descriptor for the good/bad block search pattern + * @mtd: MTD device structure + * @bd: descriptor for the good/bad block search pattern * - * The function creates a memory based bbt by scanning the device - * for manufacturer / software marked good / bad blocks -*/ -static int nand_memory_bbt (struct mtd_info *mtd, struct nand_bbt_descr *bd) + * 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) { struct nand_chip *this = mtd->priv; - /* Ensure that we only scan for the pattern and nothing else */ - bd->options = 0; - create_bbt (mtd, this->data_buf, bd, -1); - return 0; + bd->options &= ~NAND_BBT_SCANEMPTY; + return create_bbt(mtd, this->buffers->databuf, bd, -1); } /** - * check_create - [GENERIC] create and write bbt(s) if neccecary - * @mtd: MTD device structure - * @buf: temporary buffer - * @bd: descriptor for the good/bad block search pattern + * check_create - [GENERIC] create and write bbt(s) if necessary + * @mtd: MTD device 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 neccecary - * Creation is neccecary if no bbt was found for the chip/device - * Update is neccecary 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) + * 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) { - int i, chips, writeops, chipsel, res; + 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 *rd, *rd2; - /* Do we have a bbt per chip ? */ + /* Do we have a bbt per chip? */ if (td->options & NAND_BBT_PERCHIP) chips = this->numchips; else @@ -624,87 +890,100 @@ static int check_create (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_des for (i = 0; i < chips; i++) { writeops = 0; + create = 0; rd = NULL; rd2 = NULL; - /* Per chip or per device ? */ + res = res2 = 0; + /* Per chip or per device? */ chipsel = (td->options & NAND_BBT_PERCHIP) ? i : -1; - /* Mirrored table avilable ? */ + /* Mirrored table available? */ if (md) { if (td->pages[i] == -1 && md->pages[i] == -1) { + create = 1; writeops = 0x03; - goto create; - } - - if (td->pages[i] == -1) { + } else if (td->pages[i] == -1) { rd = md; - td->version[i] = md->version[i]; - writeops = 1; - goto writecheck; - } - - if (md->pages[i] == -1) { + writeops = 0x01; + } else if (md->pages[i] == -1) { rd = td; - md->version[i] = td->version[i]; - writeops = 2; - goto writecheck; - } - - if (td->version[i] == md->version[i]) { + writeops = 0x02; + } else if (td->version[i] == md->version[i]) { rd = td; if (!(td->options & NAND_BBT_VERSION)) rd2 = md; - goto writecheck; - } - - if (((int8_t) (td->version[i] - md->version[i])) > 0) { + } else if (((int8_t)(td->version[i] - md->version[i])) > 0) { rd = td; - md->version[i] = td->version[i]; - writeops = 2; + writeops = 0x02; } else { rd = md; - td->version[i] = md->version[i]; - writeops = 1; + writeops = 0x01; } - - goto writecheck; - } else { if (td->pages[i] == -1) { + create = 1; writeops = 0x01; - goto create; + } else { + rd = td; } - rd = td; - goto writecheck; } -create: - /* Create the bad block table by scanning the device ? */ - if (!(td->options & NAND_BBT_CREATE)) - continue; - /* Create the table in memory by scanning the chip(s) */ - create_bbt (mtd, buf, bd, chipsel); - - td->version[i] = 1; - if (md) - md->version[i] = 1; -writecheck: - /* read back first ? */ - if (rd) - read_abs_bbt (mtd, buf, rd, chipsel); - /* If they weren't versioned, read both. */ - if (rd2) - read_abs_bbt (mtd, buf, rd2, chipsel); - - /* Write the bad block table to the device ? */ + if (create) { + /* Create the bad block table by scanning the device? */ + if (!(td->options & NAND_BBT_CREATE)) + 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); + + td->version[i] = 1; + if (md) + md->version[i] = 1; + } + + /* Read back first? */ + if (rd) { + res = read_abs_bbt(mtd, buf, rd, chipsel); + if (mtd_is_eccerr(res)) { + /* Mark table as invalid */ + rd->pages[i] = -1; + rd->version[i] = 0; + i--; + continue; + } + } + /* If they weren't versioned, read both */ + if (rd2) { + res2 = read_abs_bbt(mtd, buf, rd2, chipsel); + if (mtd_is_eccerr(res2)) { + /* Mark table as invalid */ + rd2->pages[i] = -1; + rd2->version[i] = 0; + i--; + continue; + } + } + + /* Scrub the flash table(s)? */ + if (mtd_is_bitflip(res) || mtd_is_bitflip(res2)) + writeops = 0x03; + + /* Update version numbers before writing */ + if (md) { + td->version[i] = max(td->version[i], md->version[i]); + md->version[i] = td->version[i]; + } + + /* 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(mtd, buf, td, md, chipsel); if (res < 0) return res; } - /* Write the mirror bad block table to the device ? */ + /* 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(mtd, buf, md, td, chipsel); if (res < 0) return res; } @@ -714,20 +993,19 @@ writecheck: /** * mark_bbt_regions - [GENERIC] mark the bad block table regions - * @mtd: MTD device structure - * @td: bad block table descriptor + * @mtd: MTD device 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) + * 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) { struct nand_chip *this = mtd->priv; int i, j, chips, block, nrblocks, update; uint8_t oldval, newval; - /* Do we have a bbt per chip ? */ + /* Do we have a bbt per chip? */ if (td->options & NAND_BBT_PERCHIP) { chips = this->numchips; nrblocks = (int)(this->chipsize >> this->bbt_erase_shift); @@ -739,14 +1017,15 @@ static void mark_bbt_region (struct mtd_info *mtd, struct nand_bbt_descr *td) for (i = 0; i < chips; i++) { if ((td->options & NAND_BBT_ABSPAGE) || !(td->options & NAND_BBT_WRITE)) { - if (td->pages[i] == -1) continue; + if (td->pages[i] == -1) + continue; block = td->pages[i] >> (this->bbt_erase_shift - this->page_shift); block <<= 1; oldval = this->bbt[(block >> 3)]; newval = oldval | (0x2 << (block & 0x06)); this->bbt[(block >> 3)] = newval; if ((oldval != newval) && td->reserved_block_code) - nand_update_bbt(mtd, block << (this->bbt_erase_shift - 1)); + nand_update_bbt(mtd, (loff_t)block << (this->bbt_erase_shift - 1)); continue; } update = 0; @@ -759,32 +1038,81 @@ static void mark_bbt_region (struct mtd_info *mtd, struct nand_bbt_descr *td) oldval = this->bbt[(block >> 3)]; newval = oldval | (0x2 << (block & 0x06)); this->bbt[(block >> 3)] = newval; - if (oldval != newval) update = 1; + if (oldval != newval) + update = 1; block += 2; } - /* If we want reserved blocks to be recorded to flash, and some - new ones have been marked, then we need to update the stored - bbts. This should only happen once. */ + /* + * If we want reserved blocks to be recorded to flash, and some + * new ones have been marked, then we need to update the stored + * bbts. This should only happen once. + */ if (update && td->reserved_block_code) - nand_update_bbt(mtd, (block - 2) << (this->bbt_erase_shift - 1)); + nand_update_bbt(mtd, (loff_t)(block - 2) << (this->bbt_erase_shift - 1)); } } /** - * 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 + * verify_bbt_descr - verify the bad block description + * @mtd: MTD device structure + * @bd: the table to verify * - * 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 the bad block table(s) to - * the selected place. + * 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) +{ + struct nand_chip *this = mtd->priv; + u32 pattern_len; + u32 bits; + u32 table_size; + + if (!bd) + return; + + 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(!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(bd->offs); + if (bd->options & NAND_BBT_VERSION) + BUG_ON(bd->veroffs != bd->len); + BUG_ON(bd->options & NAND_BBT_SAVECONTENT); + } + + if (bd->options & NAND_BBT_PERCHIP) + table_size = this->chipsize >> this->bbt_erase_shift; + else + table_size = mtd->size >> this->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)); +} + +/** + * 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 * - * The bad block table memory is allocated here. It must be freed - * by calling the nand_free_bbt function. + * 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 + * the bad block table(s) to the selected place. * -*/ -int nand_scan_bbt (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. + */ +int nand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd) { struct nand_chip *this = mtd->priv; int len, res = 0; @@ -793,64 +1121,69 @@ int nand_scan_bbt (struct mtd_info *mtd, struct nand_bbt_descr *bd) struct nand_bbt_descr *md = this->bbt_md; len = mtd->size >> (this->bbt_erase_shift + 2); - /* Allocate memory (2bit per block) */ - this->bbt = kmalloc (len, GFP_KERNEL); - if (!this->bbt) { - printk (KERN_ERR "nand_scan_bbt: Out of memory\n"); + /* + * Allocate memory (2bit per block) and clear the memory bad block + * table. + */ + this->bbt = kzalloc(len, GFP_KERNEL); + if (!this->bbt) return -ENOMEM; - } - /* Clear the memory bad block table */ - memset (this->bbt, 0x00, len); - /* If no primary table decriptor is given, scan the device - * to build a memory based bad block table + /* + * If no primary table decriptor is given, scan the device to build a + * memory based bad block table. */ - if (!td) - return nand_memory_bbt(mtd, bd); + if (!td) { + if ((res = nand_memory_bbt(mtd, bd))) { + pr_err("nand_bbt: can't scan flash and build the RAM-based BBT\n"); + kfree(this->bbt); + this->bbt = NULL; + } + return res; + } + verify_bbt_descr(mtd, td); + verify_bbt_descr(mtd, md); /* Allocate a temporary buffer for one eraseblock incl. oob */ len = (1 << this->bbt_erase_shift); len += (len >> this->page_shift) * mtd->oobsize; - buf = kmalloc (len, GFP_KERNEL); + buf = vmalloc(len); if (!buf) { - printk (KERN_ERR "nand_bbt: Out of memory\n"); - kfree (this->bbt); + kfree(this->bbt); this->bbt = NULL; return -ENOMEM; } - /* Is the bbt at a given page ? */ + /* Is the bbt at a given page? */ if (td->options & NAND_BBT_ABSPAGE) { - res = read_abs_bbts (mtd, buf, td, md); + read_abs_bbts(mtd, buf, td, md); } else { /* Search the bad block table using a pattern in oob */ - res = search_read_bbts (mtd, buf, td, md); + search_read_bbts(mtd, buf, td, md); } - if (res) - res = check_create (mtd, buf, bd); + res = check_create(mtd, buf, bd); /* Prevent the bbt regions from erasing / writing */ - mark_bbt_region (mtd, td); + mark_bbt_region(mtd, td); if (md) - mark_bbt_region (mtd, md); + mark_bbt_region(mtd, md); - kfree (buf); + vfree(buf); return res; } - /** * nand_update_bbt - [NAND Interface] update bad block table(s) - * @mtd: MTD device structure - * @offs: the offset of the newly marked block + * @mtd: MTD device structure + * @offs: the offset of the newly marked block * - * The function updates the bad block table(s) -*/ -int nand_update_bbt (struct mtd_info *mtd, loff_t offs) + * The function updates the bad block table(s). + */ +int nand_update_bbt(struct mtd_info *mtd, loff_t offs) { struct nand_chip *this = mtd->priv; - int len, res = 0, writeops = 0; + int len, res = 0; int chip, chipsel; uint8_t *buf; struct nand_bbt_descr *td = this->bbt_td; @@ -859,21 +1192,16 @@ int nand_update_bbt (struct mtd_info *mtd, loff_t offs) if (!this->bbt || !td) return -EINVAL; - len = mtd->size >> (this->bbt_erase_shift + 2); /* Allocate a temporary buffer for one eraseblock incl. oob */ len = (1 << this->bbt_erase_shift); len += (len >> this->page_shift) * mtd->oobsize; - buf = kmalloc (len, GFP_KERNEL); - if (!buf) { - printk (KERN_ERR "nand_update_bbt: Out of memory\n"); + buf = kmalloc(len, GFP_KERNEL); + if (!buf) return -ENOMEM; - } - - writeops = md != NULL ? 0x03 : 0x01; - /* Do we have a bbt per chip ? */ + /* Do we have a bbt per chip? */ if (td->options & NAND_BBT_PERCHIP) { - chip = (int) (offs >> this->chip_shift); + chip = (int)(offs >> this->chip_shift); chipsel = chip; } else { chip = 0; @@ -884,57 +1212,28 @@ int nand_update_bbt (struct mtd_info *mtd, loff_t offs) if (md) md->version[chip]++; - /* Write the bad block table to the device ? */ - if ((writeops & 0x01) && (td->options & NAND_BBT_WRITE)) { - res = write_bbt (mtd, buf, td, md, chipsel); + /* Write the bad block table to the device? */ + if (td->options & NAND_BBT_WRITE) { + res = write_bbt(mtd, buf, td, md, chipsel); if (res < 0) goto out; } - /* 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); + /* Write the mirror bad block table to the device? */ + if (md && (md->options & NAND_BBT_WRITE)) { + res = write_bbt(mtd, buf, md, td, chipsel); } -out: - kfree (buf); + out: + kfree(buf); return res; } -/* Define some generic bad / good block scan pattern which are used - * while scanning a device for factory marked good / bad blocks - * - * The memory based patterns just +/* + * 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 }; -static struct nand_bbt_descr smallpage_memorybased = { - .options = 0, - .offs = 5, - .len = 1, - .pattern = scan_ff_pattern -}; - -static struct nand_bbt_descr largepage_memorybased = { - .options = 0, - .offs = 0, - .len = 2, - .pattern = scan_ff_pattern -}; - -static struct nand_bbt_descr smallpage_flashbased = { - .options = NAND_BBT_SCANEMPTY | NAND_BBT_SCANALLPAGES, - .offs = 5, - .len = 1, - .pattern = scan_ff_pattern -}; - -static struct nand_bbt_descr largepage_flashbased = { - .options = NAND_BBT_SCANEMPTY | NAND_BBT_SCANALLPAGES, - .offs = 0, - .len = 2, - .pattern = scan_ff_pattern -}; - static uint8_t scan_agand_pattern[] = { 0x1C, 0x71, 0xC7, 0x1C, 0x71, 0xC7 }; static struct nand_bbt_descr agand_flashbased = { @@ -944,8 +1243,7 @@ static struct nand_bbt_descr agand_flashbased = { .pattern = scan_agand_pattern }; -/* Generic flash bbt decriptors -*/ +/* Generic flash bbt descriptors */ static uint8_t bbt_pattern[] = {'B', 'b', 't', '0' }; static uint8_t mirror_pattern[] = {'1', 't', 'b', 'B' }; @@ -955,7 +1253,7 @@ static struct nand_bbt_descr bbt_main_descr = { .offs = 8, .len = 4, .veroffs = 12, - .maxblocks = 4, + .maxblocks = NAND_BBT_SCAN_MAXBLOCKS, .pattern = bbt_pattern }; @@ -965,88 +1263,135 @@ static struct nand_bbt_descr bbt_mirror_descr = { .offs = 8, .len = 4, .veroffs = 12, - .maxblocks = 4, + .maxblocks = NAND_BBT_SCAN_MAXBLOCKS, + .pattern = mirror_pattern +}; + +static struct nand_bbt_descr bbt_main_no_oob_descr = { + .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE + | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP + | NAND_BBT_NO_OOB, + .len = 4, + .veroffs = 4, + .maxblocks = NAND_BBT_SCAN_MAXBLOCKS, + .pattern = bbt_pattern +}; + +static struct nand_bbt_descr bbt_mirror_no_oob_descr = { + .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE + | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP + | NAND_BBT_NO_OOB, + .len = 4, + .veroffs = 4, + .maxblocks = NAND_BBT_SCAN_MAXBLOCKS, .pattern = mirror_pattern }; +#define BADBLOCK_SCAN_MASK (~NAND_BBT_NO_OOB) /** - * nand_default_bbt - [NAND Interface] Select a default bad block table for the device - * @mtd: MTD device structure + * nand_create_badblock_pattern - [INTERN] Creates a BBT descriptor structure + * @this: NAND chip to create descriptor for * - * This function selects the default bad block table - * support for the device and calls the nand_scan_bbt function + * 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 * -*/ -int nand_default_bbt (struct mtd_info *mtd) + * This function selects the default bad block table support for the device and + * calls the nand_scan_bbt function. + */ +int nand_default_bbt(struct mtd_info *mtd) { struct nand_chip *this = mtd->priv; - /* Default for AG-AND. We must use a flash based - * bad block table as the devices have factory marked - * _good_ blocks. Erasing those blocks leads to loss - * of the good / bad information, so we _must_ store - * this information in a good / bad table during - * startup - */ + /* + * Default for AG-AND. We must use a flash based bad block table as the + * devices have factory marked _good_ blocks. Erasing those blocks + * leads to loss of the good / bad information, so we _must_ store this + * information in a good / bad table during startup. + */ if (this->options & NAND_IS_AND) { /* Use the default pattern descriptors */ if (!this->bbt_td) { this->bbt_td = &bbt_main_descr; this->bbt_md = &bbt_mirror_descr; } - this->options |= NAND_USE_FLASH_BBT; - return nand_scan_bbt (mtd, &agand_flashbased); + this->bbt_options |= NAND_BBT_USE_FLASH; + return nand_scan_bbt(mtd, &agand_flashbased); } - - /* Is a flash based bad block table requested ? */ - if (this->options & NAND_USE_FLASH_BBT) { + /* Is a flash based bad block table requested? */ + if (this->bbt_options & NAND_BBT_USE_FLASH) { /* Use the default pattern descriptors */ if (!this->bbt_td) { - this->bbt_td = &bbt_main_descr; - this->bbt_md = &bbt_mirror_descr; - } - if (!this->badblock_pattern) { - this->badblock_pattern = (mtd->oobblock > 512) ? - &largepage_flashbased : &smallpage_flashbased; + if (this->bbt_options & NAND_BBT_NO_OOB) { + this->bbt_td = &bbt_main_no_oob_descr; + this->bbt_md = &bbt_mirror_no_oob_descr; + } else { + this->bbt_td = &bbt_main_descr; + this->bbt_md = &bbt_mirror_descr; + } } } else { this->bbt_td = NULL; this->bbt_md = NULL; - if (!this->badblock_pattern) { - this->badblock_pattern = (mtd->oobblock > 512) ? - &largepage_memorybased : &smallpage_memorybased; - } } - return nand_scan_bbt (mtd, this->badblock_pattern); + + if (!this->badblock_pattern) + nand_create_badblock_pattern(this); + + return nand_scan_bbt(mtd, this->badblock_pattern); } /** * nand_isbad_bbt - [NAND Interface] Check if a block is bad - * @mtd: MTD device structure - * @offs: offset in the device - * @allowbbt: allow access to bad block table region - * + * @mtd: MTD device 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_isbad_bbt(struct mtd_info *mtd, loff_t offs, int allowbbt) { struct nand_chip *this = mtd->priv; int block; - uint8_t res; + uint8_t res; /* Get block number * 2 */ - block = (int) (offs >> (this->bbt_erase_shift - 1)); + block = (int)(offs >> (this->bbt_erase_shift - 1)); res = (this->bbt[block >> 3] >> (block & 0x06)) & 0x03; - DEBUG (MTD_DEBUG_LEVEL2, "nand_isbad_bbt(): bbt info for offs 0x%08x: (block %d) 0x%02x\n", - (unsigned int)offs, res, block >> 1); + MTDDEBUG(MTD_DEBUG_LEVEL2, "nand_isbad_bbt(): bbt info for offs 0x%08x: (block %d) 0x%02x\n", + (unsigned int)offs, block >> 1, res); switch ((int)res) { - case 0x00: return 0; - case 0x01: return 1; - case 0x02: return allowbbt ? 0 : 1; + case 0x00: + return 0; + case 0x01: + return 1; + case 0x02: + return allowbbt ? 0 : 1; } return 1; } - -#endif