Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * drivers/mtd/nand_bbt.c |
| 3 | * |
| 4 | * Overview: |
| 5 | * Bad block table support for the NAND driver |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 6 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * Copyright (C) 2004 Thomas Gleixner (tglx@linutronix.de) |
| 8 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License version 2 as |
| 11 | * published by the Free Software Foundation. |
| 12 | * |
| 13 | * Description: |
| 14 | * |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 15 | * When nand_scan_bbt is called, then it tries to find the bad block table |
Sebastian Andrzej Siewior | 7cba7b1 | 2010-09-30 21:28:01 +0200 | [diff] [blame] | 16 | * depending on the options in the BBT descriptor(s). If no flash based BBT |
Brian Norris | bb9ebd4 | 2011-05-31 16:31:23 -0700 | [diff] [blame] | 17 | * (NAND_BBT_USE_FLASH) is specified then the device is scanned for factory |
Sebastian Andrzej Siewior | 7cba7b1 | 2010-09-30 21:28:01 +0200 | [diff] [blame] | 18 | * marked good / bad blocks. This information is used to create a memory BBT. |
| 19 | * Once a new bad block is discovered then the "factory" information is updated |
| 20 | * on the device. |
| 21 | * If a flash based BBT is specified then the function first tries to find the |
| 22 | * BBT on flash. If a BBT is found then the contents are read and the memory |
| 23 | * based BBT is created. If a mirrored BBT is selected then the mirror is |
| 24 | * searched too and the versions are compared. If the mirror has a greater |
| 25 | * version number than the mirror BBT is used to build the memory based BBT. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | * If the tables are not versioned, then we "or" the bad block information. |
Sebastian Andrzej Siewior | 7cba7b1 | 2010-09-30 21:28:01 +0200 | [diff] [blame] | 27 | * If one of the BBTs is out of date or does not exist it is (re)created. |
| 28 | * If no BBT exists at all then the device is scanned for factory marked |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 29 | * good / bad blocks and the bad block tables are created. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | * |
Sebastian Andrzej Siewior | 7cba7b1 | 2010-09-30 21:28:01 +0200 | [diff] [blame] | 31 | * For manufacturer created BBTs like the one found on M-SYS DOC devices |
| 32 | * the BBT is searched and read but never created |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | * |
Sebastian Andrzej Siewior | 7cba7b1 | 2010-09-30 21:28:01 +0200 | [diff] [blame] | 34 | * The auto generated bad block table is located in the last good blocks |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 35 | * of the device. The table is mirrored, so it can be updated eventually. |
Sebastian Andrzej Siewior | 7cba7b1 | 2010-09-30 21:28:01 +0200 | [diff] [blame] | 36 | * The table is marked in the OOB area with an ident pattern and a version |
| 37 | * number which indicates which of both tables is more up to date. If the NAND |
| 38 | * controller needs the complete OOB area for the ECC information then the |
Brian Norris | bb9ebd4 | 2011-05-31 16:31:23 -0700 | [diff] [blame] | 39 | * option NAND_BBT_NO_OOB should be used (along with NAND_BBT_USE_FLASH, of |
Brian Norris | a40f734 | 2011-05-31 16:31:22 -0700 | [diff] [blame] | 40 | * course): it moves the ident pattern and the version byte into the data area |
| 41 | * and the OOB area will remain untouched. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | * |
| 43 | * The table uses 2 bits per block |
Sebastian Andrzej Siewior | 7cba7b1 | 2010-09-30 21:28:01 +0200 | [diff] [blame] | 44 | * 11b: block is good |
| 45 | * 00b: block is factory marked bad |
| 46 | * 01b, 10b: block is marked bad due to wear |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | * |
| 48 | * The memory bad block table uses the following scheme: |
| 49 | * 00b: block is good |
| 50 | * 01b: block is marked bad due to wear |
| 51 | * 10b: block is reserved (to protect the bbt area) |
| 52 | * 11b: block is factory marked bad |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 53 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | * Multichip devices like DOC store the bad block info per floor. |
| 55 | * |
| 56 | * Following assumptions are made: |
| 57 | * - bbts start at a page boundary, if autolocated on a block boundary |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 58 | * - the space necessary for a bbt in FLASH does not exceed a block boundary |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 59 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | */ |
| 61 | |
| 62 | #include <linux/slab.h> |
| 63 | #include <linux/types.h> |
| 64 | #include <linux/mtd/mtd.h> |
| 65 | #include <linux/mtd/nand.h> |
| 66 | #include <linux/mtd/nand_ecc.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | #include <linux/bitops.h> |
| 68 | #include <linux/delay.h> |
David Woodhouse | c3f8abf | 2006-05-13 04:03:42 +0100 | [diff] [blame] | 69 | #include <linux/vmalloc.h> |
Paul Gortmaker | f3bcc01 | 2011-07-10 12:43:28 -0400 | [diff] [blame] | 70 | #include <linux/export.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | |
Sebastian Andrzej Siewior | 7cba7b1 | 2010-09-30 21:28:01 +0200 | [diff] [blame] | 72 | static int check_pattern_no_oob(uint8_t *buf, struct nand_bbt_descr *td) |
| 73 | { |
| 74 | int ret; |
| 75 | |
| 76 | ret = memcmp(buf, td->pattern, td->len); |
| 77 | if (!ret) |
| 78 | return ret; |
| 79 | return -1; |
| 80 | } |
| 81 | |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 82 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | * check_pattern - [GENERIC] check if a pattern is in the buffer |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 84 | * @buf: the buffer to search |
| 85 | * @len: the length of buffer to search |
| 86 | * @paglen: the pagelength |
| 87 | * @td: search pattern descriptor |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | * |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 89 | * Check for a pattern at the given place. Used to search bad block tables and |
| 90 | * good / bad block identifiers. If the SCAN_EMPTY option is set then check, if |
| 91 | * all bytes except the pattern area contain 0xff. |
| 92 | */ |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 93 | static int check_pattern(uint8_t *buf, int len, int paglen, struct nand_bbt_descr *td) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | { |
Artem B. Bityuckiy | 171650a | 2005-02-16 17:09:39 +0000 | [diff] [blame] | 95 | int i, end = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | uint8_t *p = buf; |
| 97 | |
Sebastian Andrzej Siewior | 7cba7b1 | 2010-09-30 21:28:01 +0200 | [diff] [blame] | 98 | if (td->options & NAND_BBT_NO_OOB) |
| 99 | return check_pattern_no_oob(buf, td); |
| 100 | |
Thomas Gleixner | c9e05365 | 2005-06-14 16:39:57 +0100 | [diff] [blame] | 101 | end = paglen + td->offs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | if (td->options & NAND_BBT_SCANEMPTY) { |
| 103 | for (i = 0; i < end; i++) { |
| 104 | if (p[i] != 0xff) |
| 105 | return -1; |
| 106 | } |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 107 | } |
Thomas Gleixner | c9e05365 | 2005-06-14 16:39:57 +0100 | [diff] [blame] | 108 | p += end; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 109 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | /* Compare the pattern */ |
Brian Norris | 75b66d8 | 2011-09-07 13:13:41 -0700 | [diff] [blame] | 111 | if (memcmp(p, td->pattern, td->len)) |
| 112 | return -1; |
Brian Norris | 58373ff | 2010-07-15 12:15:44 -0700 | [diff] [blame] | 113 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | if (td->options & NAND_BBT_SCANEMPTY) { |
Artem B. Bityuckiy | 171650a | 2005-02-16 17:09:39 +0000 | [diff] [blame] | 115 | p += td->len; |
| 116 | end += td->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | for (i = end; i < len; i++) { |
| 118 | if (*p++ != 0xff) |
| 119 | return -1; |
| 120 | } |
| 121 | } |
| 122 | return 0; |
| 123 | } |
| 124 | |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 125 | /** |
Thomas Gleixner | c9e05365 | 2005-06-14 16:39:57 +0100 | [diff] [blame] | 126 | * check_short_pattern - [GENERIC] check if a pattern is in the buffer |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 127 | * @buf: the buffer to search |
| 128 | * @td: search pattern descriptor |
Thomas Gleixner | c9e05365 | 2005-06-14 16:39:57 +0100 | [diff] [blame] | 129 | * |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 130 | * Check for a pattern at the given place. Used to search bad block tables and |
| 131 | * good / bad block identifiers. Same as check_pattern, but no optional empty |
| 132 | * check. |
| 133 | */ |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 134 | static int check_short_pattern(uint8_t *buf, struct nand_bbt_descr *td) |
Thomas Gleixner | c9e05365 | 2005-06-14 16:39:57 +0100 | [diff] [blame] | 135 | { |
| 136 | int i; |
| 137 | uint8_t *p = buf; |
| 138 | |
| 139 | /* Compare the pattern */ |
| 140 | for (i = 0; i < td->len; i++) { |
Thomas Gleixner | 19870da | 2005-07-15 14:53:51 +0100 | [diff] [blame] | 141 | if (p[td->offs + i] != td->pattern[i]) |
Thomas Gleixner | c9e05365 | 2005-06-14 16:39:57 +0100 | [diff] [blame] | 142 | return -1; |
| 143 | } |
| 144 | return 0; |
| 145 | } |
| 146 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | /** |
Sebastian Andrzej Siewior | 7cba7b1 | 2010-09-30 21:28:01 +0200 | [diff] [blame] | 148 | * add_marker_len - compute the length of the marker in data area |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 149 | * @td: BBT descriptor used for computation |
Sebastian Andrzej Siewior | 7cba7b1 | 2010-09-30 21:28:01 +0200 | [diff] [blame] | 150 | * |
Brian Norris | 7854d3f | 2011-06-23 14:12:08 -0700 | [diff] [blame] | 151 | * The length will be 0 if the marker is located in OOB area. |
Sebastian Andrzej Siewior | 7cba7b1 | 2010-09-30 21:28:01 +0200 | [diff] [blame] | 152 | */ |
| 153 | static u32 add_marker_len(struct nand_bbt_descr *td) |
| 154 | { |
| 155 | u32 len; |
| 156 | |
| 157 | if (!(td->options & NAND_BBT_NO_OOB)) |
| 158 | return 0; |
| 159 | |
| 160 | len = td->len; |
| 161 | if (td->options & NAND_BBT_VERSION) |
| 162 | len++; |
| 163 | return len; |
| 164 | } |
| 165 | |
| 166 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | * read_bbt - [GENERIC] Read the bad block table starting from page |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 168 | * @mtd: MTD device structure |
| 169 | * @buf: temporary buffer |
| 170 | * @page: the starting page |
| 171 | * @num: the number of bbt descriptors to read |
Brian Norris | 7854d3f | 2011-06-23 14:12:08 -0700 | [diff] [blame] | 172 | * @td: the bbt describtion table |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 173 | * @offs: offset in the memory table |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | * |
| 175 | * Read the bad block table starting from page. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | */ |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 177 | static int read_bbt(struct mtd_info *mtd, uint8_t *buf, int page, int num, |
Sebastian Andrzej Siewior | df5b4e3 | 2010-09-29 19:43:51 +0200 | [diff] [blame] | 178 | struct nand_bbt_descr *td, int offs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | { |
Brian Norris | 167a8d5 | 2011-09-20 18:35:08 -0700 | [diff] [blame] | 180 | int res, ret = 0, i, j, act = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | struct nand_chip *this = mtd->priv; |
| 182 | size_t retlen, len, totlen; |
| 183 | loff_t from; |
Sebastian Andrzej Siewior | df5b4e3 | 2010-09-29 19:43:51 +0200 | [diff] [blame] | 184 | int bits = td->options & NAND_BBT_NRBITS_MSK; |
Brian Norris | 596d745 | 2011-09-07 13:13:33 -0700 | [diff] [blame] | 185 | uint8_t msk = (uint8_t)((1 << bits) - 1); |
Sebastian Andrzej Siewior | 7cba7b1 | 2010-09-30 21:28:01 +0200 | [diff] [blame] | 186 | u32 marker_len; |
Sebastian Andrzej Siewior | df5b4e3 | 2010-09-29 19:43:51 +0200 | [diff] [blame] | 187 | int reserved_block_code = td->reserved_block_code; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | |
| 189 | totlen = (num * bits) >> 3; |
Sebastian Andrzej Siewior | 7cba7b1 | 2010-09-30 21:28:01 +0200 | [diff] [blame] | 190 | marker_len = add_marker_len(td); |
Brian Norris | 596d745 | 2011-09-07 13:13:33 -0700 | [diff] [blame] | 191 | from = ((loff_t)page) << this->page_shift; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 192 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | while (totlen) { |
Brian Norris | 596d745 | 2011-09-07 13:13:33 -0700 | [diff] [blame] | 194 | len = min(totlen, (size_t)(1 << this->bbt_erase_shift)); |
Sebastian Andrzej Siewior | 7cba7b1 | 2010-09-30 21:28:01 +0200 | [diff] [blame] | 195 | if (marker_len) { |
| 196 | /* |
| 197 | * In case the BBT marker is not in the OOB area it |
| 198 | * will be just in the first page. |
| 199 | */ |
| 200 | len -= marker_len; |
| 201 | from += marker_len; |
| 202 | marker_len = 0; |
| 203 | } |
Artem Bityutskiy | 329ad39 | 2011-12-23 17:30:16 +0200 | [diff] [blame] | 204 | res = mtd_read(mtd, from, len, &retlen, buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | if (res < 0) { |
Brian Norris | 167a8d5 | 2011-09-20 18:35:08 -0700 | [diff] [blame] | 206 | if (mtd_is_eccerr(res)) { |
| 207 | pr_info("nand_bbt: ECC error in BBT at " |
| 208 | "0x%012llx\n", from & ~mtd->writesize); |
| 209 | return res; |
| 210 | } else if (mtd_is_bitflip(res)) { |
| 211 | pr_info("nand_bbt: corrected error in BBT at " |
| 212 | "0x%012llx\n", from & ~mtd->writesize); |
| 213 | ret = res; |
| 214 | } else { |
| 215 | pr_info("nand_bbt: error reading BBT\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | return res; |
| 217 | } |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 218 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | |
| 220 | /* Analyse data */ |
| 221 | for (i = 0; i < len; i++) { |
| 222 | uint8_t dat = buf[i]; |
| 223 | for (j = 0; j < 8; j += bits, act += 2) { |
| 224 | uint8_t tmp = (dat >> j) & msk; |
| 225 | if (tmp == msk) |
| 226 | continue; |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 227 | if (reserved_block_code && (tmp == reserved_block_code)) { |
Brian Norris | d037021 | 2011-07-19 10:06:08 -0700 | [diff] [blame] | 228 | pr_info("nand_read_bbt: reserved block at 0x%012llx\n", |
| 229 | (loff_t)((offs << 2) + (act >> 1)) << this->bbt_erase_shift); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | this->bbt[offs + (act >> 3)] |= 0x2 << (act & 0x06); |
Thomas Gleixner | f1a28c0 | 2006-05-30 00:37:34 +0200 | [diff] [blame] | 231 | mtd->ecc_stats.bbtblocks++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | continue; |
| 233 | } |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 234 | /* |
| 235 | * Leave it for now, if it's matured we can |
Brian Norris | a0f5080 | 2011-07-19 10:06:06 -0700 | [diff] [blame] | 236 | * move this message to pr_debug. |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 237 | */ |
Brian Norris | d037021 | 2011-07-19 10:06:08 -0700 | [diff] [blame] | 238 | pr_info("nand_read_bbt: bad block at 0x%012llx\n", |
| 239 | (loff_t)((offs << 2) + (act >> 1)) << this->bbt_erase_shift); |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 240 | /* Factory marked bad or worn out? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | if (tmp == 0) |
| 242 | this->bbt[offs + (act >> 3)] |= 0x3 << (act & 0x06); |
| 243 | else |
| 244 | this->bbt[offs + (act >> 3)] |= 0x1 << (act & 0x06); |
Thomas Gleixner | f1a28c0 | 2006-05-30 00:37:34 +0200 | [diff] [blame] | 245 | mtd->ecc_stats.badblocks++; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 246 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | } |
| 248 | totlen -= len; |
| 249 | from += len; |
| 250 | } |
Brian Norris | 167a8d5 | 2011-09-20 18:35:08 -0700 | [diff] [blame] | 251 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | } |
| 253 | |
| 254 | /** |
| 255 | * read_abs_bbt - [GENERIC] Read the bad block table starting at a given page |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 256 | * @mtd: MTD device structure |
| 257 | * @buf: temporary buffer |
| 258 | * @td: descriptor for the bad block table |
Brian Norris | 596d745 | 2011-09-07 13:13:33 -0700 | [diff] [blame] | 259 | * @chip: read the table for a specific chip, -1 read all chips; applies only if |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 260 | * NAND_BBT_PERCHIP option is set |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | * |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 262 | * Read the bad block table for all chips starting at a given page. We assume |
| 263 | * that the bbt bits are in consecutive order. |
| 264 | */ |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 265 | static int read_abs_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td, int chip) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | { |
| 267 | struct nand_chip *this = mtd->priv; |
| 268 | int res = 0, i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | if (td->options & NAND_BBT_PERCHIP) { |
| 271 | int offs = 0; |
| 272 | for (i = 0; i < this->numchips; i++) { |
| 273 | if (chip == -1 || chip == i) |
Sebastian Andrzej Siewior | df5b4e3 | 2010-09-29 19:43:51 +0200 | [diff] [blame] | 274 | res = read_bbt(mtd, buf, td->pages[i], |
| 275 | this->chipsize >> this->bbt_erase_shift, |
| 276 | td, offs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | if (res) |
| 278 | return res; |
| 279 | offs += this->chipsize >> (this->bbt_erase_shift + 2); |
| 280 | } |
| 281 | } else { |
Sebastian Andrzej Siewior | df5b4e3 | 2010-09-29 19:43:51 +0200 | [diff] [blame] | 282 | res = read_bbt(mtd, buf, td->pages[0], |
| 283 | mtd->size >> this->bbt_erase_shift, td, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | if (res) |
| 285 | return res; |
| 286 | } |
| 287 | return 0; |
| 288 | } |
| 289 | |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 290 | /* BBT marker is in the first page, no OOB */ |
Sebastian Andrzej Siewior | 7cba7b1 | 2010-09-30 21:28:01 +0200 | [diff] [blame] | 291 | static int scan_read_raw_data(struct mtd_info *mtd, uint8_t *buf, loff_t offs, |
| 292 | struct nand_bbt_descr *td) |
| 293 | { |
| 294 | size_t retlen; |
| 295 | size_t len; |
| 296 | |
| 297 | len = td->len; |
| 298 | if (td->options & NAND_BBT_VERSION) |
| 299 | len++; |
| 300 | |
Artem Bityutskiy | 329ad39 | 2011-12-23 17:30:16 +0200 | [diff] [blame] | 301 | return mtd_read(mtd, offs, len, &retlen, buf); |
Sebastian Andrzej Siewior | 7cba7b1 | 2010-09-30 21:28:01 +0200 | [diff] [blame] | 302 | } |
| 303 | |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 304 | /* Scan read raw data from flash */ |
Sebastian Andrzej Siewior | 7cba7b1 | 2010-09-30 21:28:01 +0200 | [diff] [blame] | 305 | static int scan_read_raw_oob(struct mtd_info *mtd, uint8_t *buf, loff_t offs, |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 306 | size_t len) |
| 307 | { |
| 308 | struct mtd_oob_ops ops; |
Maxim Levitsky | b64d39d | 2010-02-22 20:39:37 +0200 | [diff] [blame] | 309 | int res; |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 310 | |
Brian Norris | 0612b9d | 2011-08-30 18:45:40 -0700 | [diff] [blame] | 311 | ops.mode = MTD_OPS_RAW; |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 312 | ops.ooboffs = 0; |
| 313 | ops.ooblen = mtd->oobsize; |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 314 | |
Maxim Levitsky | b64d39d | 2010-02-22 20:39:37 +0200 | [diff] [blame] | 315 | while (len > 0) { |
Brian Norris | 105513c | 2011-09-07 13:13:28 -0700 | [diff] [blame] | 316 | ops.datbuf = buf; |
| 317 | ops.len = min(len, (size_t)mtd->writesize); |
| 318 | ops.oobbuf = buf + ops.len; |
Maxim Levitsky | b64d39d | 2010-02-22 20:39:37 +0200 | [diff] [blame] | 319 | |
Artem Bityutskiy | fd2819b | 2011-12-23 18:27:05 +0200 | [diff] [blame] | 320 | res = mtd_read_oob(mtd, offs, &ops); |
Maxim Levitsky | b64d39d | 2010-02-22 20:39:37 +0200 | [diff] [blame] | 321 | |
Brian Norris | afa17de | 2011-09-07 13:13:29 -0700 | [diff] [blame] | 322 | if (res) |
Brian Norris | 105513c | 2011-09-07 13:13:28 -0700 | [diff] [blame] | 323 | return res; |
Maxim Levitsky | b64d39d | 2010-02-22 20:39:37 +0200 | [diff] [blame] | 324 | |
| 325 | buf += mtd->oobsize + mtd->writesize; |
| 326 | len -= mtd->writesize; |
Dmitry Maluka | 34a5704 | 2012-05-11 20:51:51 +0300 | [diff] [blame] | 327 | offs += mtd->writesize; |
Maxim Levitsky | b64d39d | 2010-02-22 20:39:37 +0200 | [diff] [blame] | 328 | } |
| 329 | return 0; |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 330 | } |
| 331 | |
Sebastian Andrzej Siewior | 7cba7b1 | 2010-09-30 21:28:01 +0200 | [diff] [blame] | 332 | static int scan_read_raw(struct mtd_info *mtd, uint8_t *buf, loff_t offs, |
| 333 | size_t len, struct nand_bbt_descr *td) |
| 334 | { |
| 335 | if (td->options & NAND_BBT_NO_OOB) |
| 336 | return scan_read_raw_data(mtd, buf, offs, td); |
| 337 | else |
| 338 | return scan_read_raw_oob(mtd, buf, offs, len); |
| 339 | } |
| 340 | |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 341 | /* Scan write data with oob to flash */ |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 342 | static int scan_write_bbt(struct mtd_info *mtd, loff_t offs, size_t len, |
| 343 | uint8_t *buf, uint8_t *oob) |
| 344 | { |
| 345 | struct mtd_oob_ops ops; |
| 346 | |
Brian Norris | 0612b9d | 2011-08-30 18:45:40 -0700 | [diff] [blame] | 347 | ops.mode = MTD_OPS_PLACE_OOB; |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 348 | ops.ooboffs = 0; |
| 349 | ops.ooblen = mtd->oobsize; |
| 350 | ops.datbuf = buf; |
| 351 | ops.oobbuf = oob; |
| 352 | ops.len = len; |
| 353 | |
Artem Bityutskiy | a2cc5ba | 2011-12-23 18:29:55 +0200 | [diff] [blame] | 354 | return mtd_write_oob(mtd, offs, &ops); |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 355 | } |
| 356 | |
Sebastian Andrzej Siewior | 7cba7b1 | 2010-09-30 21:28:01 +0200 | [diff] [blame] | 357 | static u32 bbt_get_ver_offs(struct mtd_info *mtd, struct nand_bbt_descr *td) |
| 358 | { |
| 359 | u32 ver_offs = td->veroffs; |
| 360 | |
| 361 | if (!(td->options & NAND_BBT_NO_OOB)) |
| 362 | ver_offs += mtd->writesize; |
| 363 | return ver_offs; |
| 364 | } |
| 365 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | /** |
| 367 | * read_abs_bbts - [GENERIC] Read the bad block table(s) for all chips starting at a given page |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 368 | * @mtd: MTD device structure |
| 369 | * @buf: temporary buffer |
| 370 | * @td: descriptor for the bad block table |
| 371 | * @md: descriptor for the bad block table mirror |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | * |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 373 | * Read the bad block table(s) for all chips starting at a given page. We |
| 374 | * assume that the bbt bits are in consecutive order. |
| 375 | */ |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 376 | static int read_abs_bbts(struct mtd_info *mtd, uint8_t *buf, |
| 377 | struct nand_bbt_descr *td, struct nand_bbt_descr *md) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | { |
| 379 | struct nand_chip *this = mtd->priv; |
| 380 | |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 381 | /* Read the primary version, if available */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | if (td->options & NAND_BBT_VERSION) { |
Adrian Hunter | 69423d9 | 2008-12-10 13:37:21 +0000 | [diff] [blame] | 383 | scan_read_raw(mtd, buf, (loff_t)td->pages[0] << this->page_shift, |
Sebastian Andrzej Siewior | 7cba7b1 | 2010-09-30 21:28:01 +0200 | [diff] [blame] | 384 | mtd->writesize, td); |
| 385 | td->version[0] = buf[bbt_get_ver_offs(mtd, td)]; |
Brian Norris | 9a4d4d6 | 2011-07-19 10:06:07 -0700 | [diff] [blame] | 386 | pr_info("Bad block table at page %d, version 0x%02X\n", |
Brian Norris | d037021 | 2011-07-19 10:06:08 -0700 | [diff] [blame] | 387 | td->pages[0], td->version[0]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | } |
| 389 | |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 390 | /* Read the mirror version, if available */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | if (md && (md->options & NAND_BBT_VERSION)) { |
Adrian Hunter | 69423d9 | 2008-12-10 13:37:21 +0000 | [diff] [blame] | 392 | scan_read_raw(mtd, buf, (loff_t)md->pages[0] << this->page_shift, |
Sebastian Andrzej Siewior | 7cba7b1 | 2010-09-30 21:28:01 +0200 | [diff] [blame] | 393 | mtd->writesize, td); |
| 394 | md->version[0] = buf[bbt_get_ver_offs(mtd, md)]; |
Brian Norris | 9a4d4d6 | 2011-07-19 10:06:07 -0700 | [diff] [blame] | 395 | pr_info("Bad block table at page %d, version 0x%02X\n", |
Brian Norris | d037021 | 2011-07-19 10:06:08 -0700 | [diff] [blame] | 396 | md->pages[0], md->version[0]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | return 1; |
| 399 | } |
| 400 | |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 401 | /* Scan a given block full */ |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 402 | static int scan_block_full(struct mtd_info *mtd, struct nand_bbt_descr *bd, |
| 403 | loff_t offs, uint8_t *buf, size_t readlen, |
| 404 | int scanlen, int len) |
| 405 | { |
| 406 | int ret, j; |
| 407 | |
Sebastian Andrzej Siewior | 7cba7b1 | 2010-09-30 21:28:01 +0200 | [diff] [blame] | 408 | ret = scan_read_raw_oob(mtd, buf, offs, readlen); |
Brian Norris | afa17de | 2011-09-07 13:13:29 -0700 | [diff] [blame] | 409 | /* Ignore ECC errors when checking for BBM */ |
Brian Norris | d57f4054 | 2011-09-20 18:34:25 -0700 | [diff] [blame] | 410 | if (ret && !mtd_is_bitflip_or_eccerr(ret)) |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 411 | return ret; |
| 412 | |
| 413 | for (j = 0; j < len; j++, buf += scanlen) { |
| 414 | if (check_pattern(buf, scanlen, mtd->writesize, bd)) |
| 415 | return 1; |
| 416 | } |
| 417 | return 0; |
| 418 | } |
| 419 | |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 420 | /* Scan a given block partially */ |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 421 | static int scan_block_fast(struct mtd_info *mtd, struct nand_bbt_descr *bd, |
| 422 | loff_t offs, uint8_t *buf, int len) |
| 423 | { |
| 424 | struct mtd_oob_ops ops; |
| 425 | int j, ret; |
| 426 | |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 427 | ops.ooblen = mtd->oobsize; |
| 428 | ops.oobbuf = buf; |
| 429 | ops.ooboffs = 0; |
| 430 | ops.datbuf = NULL; |
Brian Norris | 0612b9d | 2011-08-30 18:45:40 -0700 | [diff] [blame] | 431 | ops.mode = MTD_OPS_PLACE_OOB; |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 432 | |
| 433 | for (j = 0; j < len; j++) { |
| 434 | /* |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 435 | * Read the full oob until read_oob is fixed to handle single |
| 436 | * byte reads for 16 bit buswidth. |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 437 | */ |
Artem Bityutskiy | fd2819b | 2011-12-23 18:27:05 +0200 | [diff] [blame] | 438 | ret = mtd_read_oob(mtd, offs, &ops); |
Brian Norris | 903cd06 | 2011-06-28 16:28:58 -0700 | [diff] [blame] | 439 | /* Ignore ECC errors when checking for BBM */ |
Brian Norris | d57f4054 | 2011-09-20 18:34:25 -0700 | [diff] [blame] | 440 | if (ret && !mtd_is_bitflip_or_eccerr(ret)) |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 441 | return ret; |
| 442 | |
| 443 | if (check_short_pattern(buf, bd)) |
| 444 | return 1; |
| 445 | |
| 446 | offs += mtd->writesize; |
| 447 | } |
| 448 | return 0; |
| 449 | } |
| 450 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | /** |
| 452 | * create_bbt - [GENERIC] Create a bad block table by scanning the device |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 453 | * @mtd: MTD device structure |
| 454 | * @buf: temporary buffer |
| 455 | * @bd: descriptor for the good/bad block search pattern |
| 456 | * @chip: create the table for a specific chip, -1 read all chips; applies only |
| 457 | * if NAND_BBT_PERCHIP option is set |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | * |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 459 | * Create a bad block table by scanning the device for the given good/bad block |
| 460 | * identify pattern. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | */ |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 462 | static int create_bbt(struct mtd_info *mtd, uint8_t *buf, |
| 463 | struct nand_bbt_descr *bd, int chip) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | { |
| 465 | struct nand_chip *this = mtd->priv; |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 466 | int i, numblocks, len, scanlen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | int startblock; |
| 468 | loff_t from; |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 469 | size_t readlen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | |
Brian Norris | 9a4d4d6 | 2011-07-19 10:06:07 -0700 | [diff] [blame] | 471 | pr_info("Scanning device for bad blocks\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | |
| 473 | if (bd->options & NAND_BBT_SCANALLPAGES) |
| 474 | len = 1 << (this->bbt_erase_shift - this->page_shift); |
Brian Norris | 58373ff | 2010-07-15 12:15:44 -0700 | [diff] [blame] | 475 | else if (bd->options & NAND_BBT_SCAN2NDPAGE) |
| 476 | len = 2; |
| 477 | else |
| 478 | len = 1; |
Artem B. Bityuckiy | 171650a | 2005-02-16 17:09:39 +0000 | [diff] [blame] | 479 | |
| 480 | if (!(bd->options & NAND_BBT_SCANEMPTY)) { |
| 481 | /* We need only read few bytes from the OOB area */ |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 482 | scanlen = 0; |
Artem B. Bityuckiy | eeada24 | 2005-02-11 10:14:15 +0000 | [diff] [blame] | 483 | readlen = bd->len; |
| 484 | } else { |
Artem B. Bityuckiy | 171650a | 2005-02-16 17:09:39 +0000 | [diff] [blame] | 485 | /* Full page content should be read */ |
Joern Engel | 2831877 | 2006-05-22 23:18:05 +0200 | [diff] [blame] | 486 | scanlen = mtd->writesize + mtd->oobsize; |
| 487 | readlen = len * mtd->writesize; |
Artem B. Bityuckiy | eeada24 | 2005-02-11 10:14:15 +0000 | [diff] [blame] | 488 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | |
| 490 | if (chip == -1) { |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 491 | /* |
| 492 | * Note that numblocks is 2 * (real numblocks) here, see i+=2 |
| 493 | * below as it makes shifting and masking less painful |
| 494 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | numblocks = mtd->size >> (this->bbt_erase_shift - 1); |
| 496 | startblock = 0; |
| 497 | from = 0; |
| 498 | } else { |
| 499 | if (chip >= this->numchips) { |
Brian Norris | 9a4d4d6 | 2011-07-19 10:06:07 -0700 | [diff] [blame] | 500 | pr_warn("create_bbt(): chipnr (%d) > available chips (%d)\n", |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 501 | chip + 1, this->numchips); |
Artem B. Bityuckiy | 171650a | 2005-02-16 17:09:39 +0000 | [diff] [blame] | 502 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | } |
| 504 | numblocks = this->chipsize >> (this->bbt_erase_shift - 1); |
| 505 | startblock = chip * numblocks; |
| 506 | numblocks += startblock; |
Adrian Hunter | 69423d9 | 2008-12-10 13:37:21 +0000 | [diff] [blame] | 507 | from = (loff_t)startblock << (this->bbt_erase_shift - 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | } |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 509 | |
Brian Norris | 5fb1549 | 2011-05-31 16:31:21 -0700 | [diff] [blame] | 510 | if (this->bbt_options & NAND_BBT_SCANLASTPAGE) |
Kevin Cernekee | b60b08b | 2010-05-04 20:58:10 -0700 | [diff] [blame] | 511 | from += mtd->erasesize - (mtd->writesize * len); |
| 512 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | for (i = startblock; i < numblocks;) { |
Artem B. Bityuckiy | eeada24 | 2005-02-11 10:14:15 +0000 | [diff] [blame] | 514 | int ret; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 515 | |
Sebastian Andrzej Siewior | 7cba7b1 | 2010-09-30 21:28:01 +0200 | [diff] [blame] | 516 | BUG_ON(bd->options & NAND_BBT_NO_OOB); |
| 517 | |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 518 | if (bd->options & NAND_BBT_SCANALLPAGES) |
| 519 | ret = scan_block_full(mtd, bd, from, buf, readlen, |
| 520 | scanlen, len); |
| 521 | else |
| 522 | ret = scan_block_fast(mtd, bd, from, buf, len); |
Artem B. Bityuckiy | 171650a | 2005-02-16 17:09:39 +0000 | [diff] [blame] | 523 | |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 524 | if (ret < 0) |
| 525 | return ret; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 526 | |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 527 | if (ret) { |
| 528 | this->bbt[i >> 3] |= 0x03 << (i & 0x6); |
Brian Norris | 9a4d4d6 | 2011-07-19 10:06:07 -0700 | [diff] [blame] | 529 | pr_warn("Bad eraseblock %d at 0x%012llx\n", |
Brian Norris | d037021 | 2011-07-19 10:06:08 -0700 | [diff] [blame] | 530 | i >> 1, (unsigned long long)from); |
Thomas Gleixner | f1a28c0 | 2006-05-30 00:37:34 +0200 | [diff] [blame] | 531 | mtd->ecc_stats.badblocks++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | } |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 533 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | i += 2; |
| 535 | from += (1 << this->bbt_erase_shift); |
| 536 | } |
Artem B. Bityuckiy | eeada24 | 2005-02-11 10:14:15 +0000 | [diff] [blame] | 537 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | } |
| 539 | |
| 540 | /** |
| 541 | * search_bbt - [GENERIC] scan the device for a specific bad block table |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 542 | * @mtd: MTD device structure |
| 543 | * @buf: temporary buffer |
| 544 | * @td: descriptor for the bad block table |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | * |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 546 | * Read the bad block table by searching for a given ident pattern. Search is |
| 547 | * preformed either from the beginning up or from the end of the device |
| 548 | * downwards. The search starts always at the start of a block. If the option |
| 549 | * NAND_BBT_PERCHIP is given, each chip is searched for a bbt, which contains |
| 550 | * the bad block information of this chip. This is necessary to provide support |
| 551 | * for certain DOC devices. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | * |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 553 | * The bbt ident pattern resides in the oob area of the first page in a block. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | */ |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 555 | static int search_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | { |
| 557 | struct nand_chip *this = mtd->priv; |
| 558 | int i, chips; |
| 559 | int bits, startblock, block, dir; |
Joern Engel | 2831877 | 2006-05-22 23:18:05 +0200 | [diff] [blame] | 560 | int scanlen = mtd->writesize + mtd->oobsize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | int bbtblocks; |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 562 | int blocktopage = this->bbt_erase_shift - this->page_shift; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 564 | /* Search direction top -> down? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | if (td->options & NAND_BBT_LASTBLOCK) { |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 566 | startblock = (mtd->size >> this->bbt_erase_shift) - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | dir = -1; |
| 568 | } else { |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 569 | startblock = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | dir = 1; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 571 | } |
| 572 | |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 573 | /* Do we have a bbt per chip? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | if (td->options & NAND_BBT_PERCHIP) { |
| 575 | chips = this->numchips; |
| 576 | bbtblocks = this->chipsize >> this->bbt_erase_shift; |
| 577 | startblock &= bbtblocks - 1; |
| 578 | } else { |
| 579 | chips = 1; |
| 580 | bbtblocks = mtd->size >> this->bbt_erase_shift; |
| 581 | } |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 582 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | /* Number of bits for each erase block in the bbt */ |
| 584 | bits = td->options & NAND_BBT_NRBITS_MSK; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 585 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | for (i = 0; i < chips; i++) { |
| 587 | /* Reset version information */ |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 588 | td->version[i] = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | td->pages[i] = -1; |
| 590 | /* Scan the maximum number of blocks */ |
| 591 | for (block = 0; block < td->maxblocks; block++) { |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 592 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | int actblock = startblock + dir * block; |
Adrian Hunter | 69423d9 | 2008-12-10 13:37:21 +0000 | [diff] [blame] | 594 | loff_t offs = (loff_t)actblock << this->bbt_erase_shift; |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 595 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | /* Read first page */ |
Sebastian Andrzej Siewior | 7cba7b1 | 2010-09-30 21:28:01 +0200 | [diff] [blame] | 597 | scan_read_raw(mtd, buf, offs, mtd->writesize, td); |
Joern Engel | 2831877 | 2006-05-22 23:18:05 +0200 | [diff] [blame] | 598 | if (!check_pattern(buf, scanlen, mtd->writesize, td)) { |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 599 | td->pages[i] = actblock << blocktopage; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | if (td->options & NAND_BBT_VERSION) { |
Sebastian Andrzej Siewior | 7cba7b1 | 2010-09-30 21:28:01 +0200 | [diff] [blame] | 601 | offs = bbt_get_ver_offs(mtd, td); |
| 602 | td->version[i] = buf[offs]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | } |
| 604 | break; |
| 605 | } |
| 606 | } |
| 607 | startblock += this->chipsize >> this->bbt_erase_shift; |
| 608 | } |
| 609 | /* Check, if we found a bbt for each requested chip */ |
| 610 | for (i = 0; i < chips; i++) { |
| 611 | if (td->pages[i] == -1) |
Brian Norris | 9a4d4d6 | 2011-07-19 10:06:07 -0700 | [diff] [blame] | 612 | pr_warn("Bad block table not found for chip %d\n", i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | else |
Brian Norris | d037021 | 2011-07-19 10:06:08 -0700 | [diff] [blame] | 614 | pr_info("Bad block table found at page %d, version " |
| 615 | "0x%02X\n", td->pages[i], td->version[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | } |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 617 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | } |
| 619 | |
| 620 | /** |
| 621 | * search_read_bbts - [GENERIC] scan the device for bad block table(s) |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 622 | * @mtd: MTD device structure |
| 623 | * @buf: temporary buffer |
| 624 | * @td: descriptor for the bad block table |
| 625 | * @md: descriptor for the bad block table mirror |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | * |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 627 | * Search and read the bad block table(s). |
| 628 | */ |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 629 | static int search_read_bbts(struct mtd_info *mtd, uint8_t * buf, struct nand_bbt_descr *td, struct nand_bbt_descr *md) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | { |
| 631 | /* Search the primary table */ |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 632 | search_bbt(mtd, buf, td); |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 633 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | /* Search the mirror table */ |
| 635 | if (md) |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 636 | search_bbt(mtd, buf, md); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 638 | /* Force result check */ |
| 639 | return 1; |
| 640 | } |
| 641 | |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 642 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | * write_bbt - [GENERIC] (Re)write the bad block table |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 644 | * @mtd: MTD device structure |
| 645 | * @buf: temporary buffer |
| 646 | * @td: descriptor for the bad block table |
| 647 | * @md: descriptor for the bad block table mirror |
| 648 | * @chipsel: selector for a specific chip, -1 for all |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | * |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 650 | * (Re)write the bad block table. |
| 651 | */ |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 652 | static int write_bbt(struct mtd_info *mtd, uint8_t *buf, |
Thomas Gleixner | 9223a45 | 2006-05-23 17:21:03 +0200 | [diff] [blame] | 653 | struct nand_bbt_descr *td, struct nand_bbt_descr *md, |
| 654 | int chipsel) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | { |
| 656 | struct nand_chip *this = mtd->priv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | struct erase_info einfo; |
| 658 | int i, j, res, chip = 0; |
| 659 | int bits, startblock, dir, page, offs, numblocks, sft, sftmsk; |
Thomas Gleixner | 9223a45 | 2006-05-23 17:21:03 +0200 | [diff] [blame] | 660 | int nrchips, bbtoffs, pageoffs, ooboffs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | uint8_t msk[4]; |
| 662 | uint8_t rcode = td->reserved_block_code; |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 663 | size_t retlen, len = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | loff_t to; |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 665 | struct mtd_oob_ops ops; |
| 666 | |
| 667 | ops.ooblen = mtd->oobsize; |
| 668 | ops.ooboffs = 0; |
| 669 | ops.datbuf = NULL; |
Brian Norris | 0612b9d | 2011-08-30 18:45:40 -0700 | [diff] [blame] | 670 | ops.mode = MTD_OPS_PLACE_OOB; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | |
| 672 | if (!rcode) |
| 673 | rcode = 0xff; |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 674 | /* Write bad block table per chip rather than per device? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | if (td->options & NAND_BBT_PERCHIP) { |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 676 | numblocks = (int)(this->chipsize >> this->bbt_erase_shift); |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 677 | /* Full device write or specific chip? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | if (chipsel == -1) { |
| 679 | nrchips = this->numchips; |
| 680 | } else { |
| 681 | nrchips = chipsel + 1; |
| 682 | chip = chipsel; |
| 683 | } |
| 684 | } else { |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 685 | numblocks = (int)(mtd->size >> this->bbt_erase_shift); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | nrchips = 1; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 687 | } |
| 688 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | /* Loop through the chips */ |
| 690 | for (; chip < nrchips; chip++) { |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 691 | /* |
| 692 | * There was already a version of the table, reuse the page |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 693 | * This applies for absolute placement too, as we have the |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 694 | * page nr. in td->pages. |
| 695 | */ |
| 696 | if (td->pages[chip] != -1) { |
| 697 | page = td->pages[chip]; |
| 698 | goto write; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 699 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 701 | /* |
| 702 | * Automatic placement of the bad block table. Search direction |
| 703 | * top -> down? |
| 704 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | if (td->options & NAND_BBT_LASTBLOCK) { |
| 706 | startblock = numblocks * (chip + 1) - 1; |
| 707 | dir = -1; |
| 708 | } else { |
| 709 | startblock = chip * numblocks; |
| 710 | dir = 1; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 711 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | |
| 713 | for (i = 0; i < td->maxblocks; i++) { |
| 714 | int block = startblock + dir * i; |
| 715 | /* Check, if the block is bad */ |
Thomas Gleixner | 9223a45 | 2006-05-23 17:21:03 +0200 | [diff] [blame] | 716 | switch ((this->bbt[block >> 2] >> |
| 717 | (2 * (block & 0x03))) & 0x03) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | case 0x01: |
| 719 | case 0x03: |
| 720 | continue; |
| 721 | } |
Thomas Gleixner | 9223a45 | 2006-05-23 17:21:03 +0200 | [diff] [blame] | 722 | page = block << |
| 723 | (this->bbt_erase_shift - this->page_shift); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | /* Check, if the block is used by the mirror table */ |
| 725 | if (!md || md->pages[chip] != page) |
| 726 | goto write; |
| 727 | } |
Brian Norris | 9a4d4d6 | 2011-07-19 10:06:07 -0700 | [diff] [blame] | 728 | pr_err("No space left to write bad block table\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | return -ENOSPC; |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 730 | write: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | |
| 732 | /* Set up shift count and masks for the flash table */ |
| 733 | bits = td->options & NAND_BBT_NRBITS_MSK; |
Thomas Gleixner | 9223a45 | 2006-05-23 17:21:03 +0200 | [diff] [blame] | 734 | msk[2] = ~rcode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | switch (bits) { |
Thomas Gleixner | 9223a45 | 2006-05-23 17:21:03 +0200 | [diff] [blame] | 736 | case 1: sft = 3; sftmsk = 0x07; msk[0] = 0x00; msk[1] = 0x01; |
| 737 | msk[3] = 0x01; |
| 738 | break; |
| 739 | case 2: sft = 2; sftmsk = 0x06; msk[0] = 0x00; msk[1] = 0x01; |
| 740 | msk[3] = 0x03; |
| 741 | break; |
| 742 | case 4: sft = 1; sftmsk = 0x04; msk[0] = 0x00; msk[1] = 0x0C; |
| 743 | msk[3] = 0x0f; |
| 744 | break; |
| 745 | case 8: sft = 0; sftmsk = 0x00; msk[0] = 0x00; msk[1] = 0x0F; |
| 746 | msk[3] = 0xff; |
| 747 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | default: return -EINVAL; |
| 749 | } |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 750 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | bbtoffs = chip * (numblocks >> 2); |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 752 | |
Brian Norris | 596d745 | 2011-09-07 13:13:33 -0700 | [diff] [blame] | 753 | to = ((loff_t)page) << this->page_shift; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 755 | /* Must we save the block contents? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | if (td->options & NAND_BBT_SAVECONTENT) { |
| 757 | /* Make it block aligned */ |
Brian Norris | 596d745 | 2011-09-07 13:13:33 -0700 | [diff] [blame] | 758 | to &= ~((loff_t)((1 << this->bbt_erase_shift) - 1)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | len = 1 << this->bbt_erase_shift; |
Artem Bityutskiy | 329ad39 | 2011-12-23 17:30:16 +0200 | [diff] [blame] | 760 | res = mtd_read(mtd, to, len, &retlen, buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | if (res < 0) { |
| 762 | if (retlen != len) { |
Brian Norris | d037021 | 2011-07-19 10:06:08 -0700 | [diff] [blame] | 763 | pr_info("nand_bbt: error reading block " |
| 764 | "for writing the bad block table\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | return res; |
| 766 | } |
Brian Norris | d037021 | 2011-07-19 10:06:08 -0700 | [diff] [blame] | 767 | pr_warn("nand_bbt: ECC error while reading " |
| 768 | "block for writing bad block table\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | } |
Thomas Gleixner | 9223a45 | 2006-05-23 17:21:03 +0200 | [diff] [blame] | 770 | /* Read oob data */ |
Vitaly Wool | 7014568 | 2006-11-03 18:20:38 +0300 | [diff] [blame] | 771 | ops.ooblen = (len >> this->page_shift) * mtd->oobsize; |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 772 | ops.oobbuf = &buf[len]; |
Artem Bityutskiy | fd2819b | 2011-12-23 18:27:05 +0200 | [diff] [blame] | 773 | res = mtd_read_oob(mtd, to + mtd->writesize, &ops); |
Vitaly Wool | 7014568 | 2006-11-03 18:20:38 +0300 | [diff] [blame] | 774 | if (res < 0 || ops.oobretlen != ops.ooblen) |
Thomas Gleixner | 9223a45 | 2006-05-23 17:21:03 +0200 | [diff] [blame] | 775 | goto outerr; |
| 776 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | /* Calc the byte offset in the buffer */ |
| 778 | pageoffs = page - (int)(to >> this->page_shift); |
| 779 | offs = pageoffs << this->page_shift; |
| 780 | /* Preset the bbt area with 0xff */ |
Brian Norris | 596d745 | 2011-09-07 13:13:33 -0700 | [diff] [blame] | 781 | memset(&buf[offs], 0xff, (size_t)(numblocks >> sft)); |
Thomas Gleixner | 9223a45 | 2006-05-23 17:21:03 +0200 | [diff] [blame] | 782 | ooboffs = len + (pageoffs * mtd->oobsize); |
| 783 | |
Sebastian Andrzej Siewior | 7cba7b1 | 2010-09-30 21:28:01 +0200 | [diff] [blame] | 784 | } else if (td->options & NAND_BBT_NO_OOB) { |
| 785 | ooboffs = 0; |
| 786 | offs = td->len; |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 787 | /* The version byte */ |
Sebastian Andrzej Siewior | 7cba7b1 | 2010-09-30 21:28:01 +0200 | [diff] [blame] | 788 | if (td->options & NAND_BBT_VERSION) |
| 789 | offs++; |
| 790 | /* Calc length */ |
Brian Norris | 596d745 | 2011-09-07 13:13:33 -0700 | [diff] [blame] | 791 | len = (size_t)(numblocks >> sft); |
Sebastian Andrzej Siewior | 7cba7b1 | 2010-09-30 21:28:01 +0200 | [diff] [blame] | 792 | len += offs; |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 793 | /* Make it page aligned! */ |
Sebastian Andrzej Siewior | 7cba7b1 | 2010-09-30 21:28:01 +0200 | [diff] [blame] | 794 | len = ALIGN(len, mtd->writesize); |
| 795 | /* Preset the buffer with 0xff */ |
| 796 | memset(buf, 0xff, len); |
| 797 | /* Pattern is located at the begin of first page */ |
| 798 | memcpy(buf, td->pattern, td->len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | } else { |
| 800 | /* Calc length */ |
Brian Norris | 596d745 | 2011-09-07 13:13:33 -0700 | [diff] [blame] | 801 | len = (size_t)(numblocks >> sft); |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 802 | /* Make it page aligned! */ |
Sebastian Andrzej Siewior | cda3209 | 2010-09-29 19:43:50 +0200 | [diff] [blame] | 803 | len = ALIGN(len, mtd->writesize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | /* Preset the buffer with 0xff */ |
Thomas Gleixner | 9223a45 | 2006-05-23 17:21:03 +0200 | [diff] [blame] | 805 | memset(buf, 0xff, len + |
| 806 | (len >> this->page_shift)* mtd->oobsize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | offs = 0; |
Thomas Gleixner | 9223a45 | 2006-05-23 17:21:03 +0200 | [diff] [blame] | 808 | ooboffs = len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | /* Pattern is located in oob area of first page */ |
Thomas Gleixner | 9223a45 | 2006-05-23 17:21:03 +0200 | [diff] [blame] | 810 | memcpy(&buf[ooboffs + td->offs], td->pattern, td->len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | } |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 812 | |
Thomas Gleixner | 9223a45 | 2006-05-23 17:21:03 +0200 | [diff] [blame] | 813 | if (td->options & NAND_BBT_VERSION) |
| 814 | buf[ooboffs + td->veroffs] = td->version[chip]; |
| 815 | |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 816 | /* Walk through the memory table */ |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 817 | for (i = 0; i < numblocks;) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | uint8_t dat; |
| 819 | dat = this->bbt[bbtoffs + (i >> 2)]; |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 820 | for (j = 0; j < 4; j++, i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | int sftcnt = (i << (3 - sft)) & sftmsk; |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 822 | /* Do not store the reserved bbt blocks! */ |
Thomas Gleixner | 9223a45 | 2006-05-23 17:21:03 +0200 | [diff] [blame] | 823 | buf[offs + (i >> sft)] &= |
| 824 | ~(msk[dat & 0x03] << sftcnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | dat >>= 2; |
| 826 | } |
| 827 | } |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 828 | |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 829 | memset(&einfo, 0, sizeof(einfo)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | einfo.mtd = mtd; |
Adrian Hunter | 69423d9 | 2008-12-10 13:37:21 +0000 | [diff] [blame] | 831 | einfo.addr = to; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | einfo.len = 1 << this->bbt_erase_shift; |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 833 | res = nand_erase_nand(mtd, &einfo, 1); |
Thomas Gleixner | 9223a45 | 2006-05-23 17:21:03 +0200 | [diff] [blame] | 834 | if (res < 0) |
| 835 | goto outerr; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 836 | |
Sebastian Andrzej Siewior | 7cba7b1 | 2010-09-30 21:28:01 +0200 | [diff] [blame] | 837 | res = scan_write_bbt(mtd, to, len, buf, |
| 838 | td->options & NAND_BBT_NO_OOB ? NULL : |
| 839 | &buf[len]); |
Thomas Gleixner | 9223a45 | 2006-05-23 17:21:03 +0200 | [diff] [blame] | 840 | if (res < 0) |
| 841 | goto outerr; |
| 842 | |
Brian Norris | d037021 | 2011-07-19 10:06:08 -0700 | [diff] [blame] | 843 | pr_info("Bad block table written to 0x%012llx, version 0x%02X\n", |
| 844 | (unsigned long long)to, td->version[chip]); |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 845 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | /* Mark it as used */ |
| 847 | td->pages[chip] = page; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 848 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | return 0; |
Thomas Gleixner | 9223a45 | 2006-05-23 17:21:03 +0200 | [diff] [blame] | 850 | |
| 851 | outerr: |
Brian Norris | d037021 | 2011-07-19 10:06:08 -0700 | [diff] [blame] | 852 | pr_warn("nand_bbt: error while writing bad block table %d\n", res); |
Thomas Gleixner | 9223a45 | 2006-05-23 17:21:03 +0200 | [diff] [blame] | 853 | return res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 854 | } |
| 855 | |
| 856 | /** |
| 857 | * nand_memory_bbt - [GENERIC] create a memory based bad block table |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 858 | * @mtd: MTD device structure |
| 859 | * @bd: descriptor for the good/bad block search pattern |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | * |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 861 | * The function creates a memory based bbt by scanning the device for |
| 862 | * manufacturer / software marked good / bad blocks. |
| 863 | */ |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 864 | static inline int nand_memory_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | { |
| 866 | struct nand_chip *this = mtd->priv; |
| 867 | |
Artem B. Bityuckiy | 171650a | 2005-02-16 17:09:39 +0000 | [diff] [blame] | 868 | bd->options &= ~NAND_BBT_SCANEMPTY; |
David Woodhouse | 4bf63fc | 2006-09-25 17:08:04 +0100 | [diff] [blame] | 869 | return create_bbt(mtd, this->buffers->databuf, bd, -1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | } |
| 871 | |
| 872 | /** |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 873 | * check_create - [GENERIC] create and write bbt(s) if necessary |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 874 | * @mtd: MTD device structure |
| 875 | * @buf: temporary buffer |
| 876 | * @bd: descriptor for the good/bad block search pattern |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | * |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 878 | * The function checks the results of the previous call to read_bbt and creates |
| 879 | * / updates the bbt(s) if necessary. Creation is necessary if no bbt was found |
| 880 | * for the chip/device. Update is necessary if one of the tables is missing or |
| 881 | * the version nr. of one table is less than the other. |
| 882 | */ |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 883 | static int check_create(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *bd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 884 | { |
Brian Norris | 623978d | 2011-09-20 18:35:34 -0700 | [diff] [blame] | 885 | int i, chips, writeops, create, chipsel, res, res2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | struct nand_chip *this = mtd->priv; |
| 887 | struct nand_bbt_descr *td = this->bbt_td; |
| 888 | struct nand_bbt_descr *md = this->bbt_md; |
| 889 | struct nand_bbt_descr *rd, *rd2; |
| 890 | |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 891 | /* Do we have a bbt per chip? */ |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 892 | if (td->options & NAND_BBT_PERCHIP) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | chips = this->numchips; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 894 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | chips = 1; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 896 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | for (i = 0; i < chips; i++) { |
| 898 | writeops = 0; |
Brian Norris | b61bf5b | 2011-09-07 13:13:35 -0700 | [diff] [blame] | 899 | create = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | rd = NULL; |
| 901 | rd2 = NULL; |
Brian Norris | 623978d | 2011-09-20 18:35:34 -0700 | [diff] [blame] | 902 | res = res2 = 0; |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 903 | /* Per chip or per device? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | chipsel = (td->options & NAND_BBT_PERCHIP) ? i : -1; |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 905 | /* Mirrored table available? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | if (md) { |
| 907 | if (td->pages[i] == -1 && md->pages[i] == -1) { |
Brian Norris | b61bf5b | 2011-09-07 13:13:35 -0700 | [diff] [blame] | 908 | create = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | writeops = 0x03; |
Brian Norris | c5e8ef9 | 2011-09-07 13:13:34 -0700 | [diff] [blame] | 910 | } else if (td->pages[i] == -1) { |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 911 | rd = md; |
Brian Norris | 596d745 | 2011-09-07 13:13:33 -0700 | [diff] [blame] | 912 | writeops = 0x01; |
Brian Norris | c5e8ef9 | 2011-09-07 13:13:34 -0700 | [diff] [blame] | 913 | } else if (md->pages[i] == -1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | rd = td; |
Brian Norris | 596d745 | 2011-09-07 13:13:33 -0700 | [diff] [blame] | 915 | writeops = 0x02; |
Brian Norris | c5e8ef9 | 2011-09-07 13:13:34 -0700 | [diff] [blame] | 916 | } else if (td->version[i] == md->version[i]) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 917 | rd = td; |
| 918 | if (!(td->options & NAND_BBT_VERSION)) |
| 919 | rd2 = md; |
Brian Norris | c5e8ef9 | 2011-09-07 13:13:34 -0700 | [diff] [blame] | 920 | } else if (((int8_t)(td->version[i] - md->version[i])) > 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | rd = td; |
Brian Norris | 596d745 | 2011-09-07 13:13:33 -0700 | [diff] [blame] | 922 | writeops = 0x02; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | } else { |
| 924 | rd = md; |
Brian Norris | 596d745 | 2011-09-07 13:13:33 -0700 | [diff] [blame] | 925 | writeops = 0x01; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 926 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | } else { |
| 928 | if (td->pages[i] == -1) { |
Brian Norris | b61bf5b | 2011-09-07 13:13:35 -0700 | [diff] [blame] | 929 | create = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | writeops = 0x01; |
Brian Norris | b61bf5b | 2011-09-07 13:13:35 -0700 | [diff] [blame] | 931 | } else { |
| 932 | rd = td; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 934 | } |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 935 | |
Brian Norris | b61bf5b | 2011-09-07 13:13:35 -0700 | [diff] [blame] | 936 | if (create) { |
| 937 | /* Create the bad block table by scanning the device? */ |
| 938 | if (!(td->options & NAND_BBT_CREATE)) |
| 939 | continue; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 940 | |
Brian Norris | b61bf5b | 2011-09-07 13:13:35 -0700 | [diff] [blame] | 941 | /* Create the table in memory by scanning the chip(s) */ |
| 942 | if (!(this->bbt_options & NAND_BBT_CREATE_EMPTY)) |
| 943 | create_bbt(mtd, buf, bd, chipsel); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 944 | |
Brian Norris | b61bf5b | 2011-09-07 13:13:35 -0700 | [diff] [blame] | 945 | td->version[i] = 1; |
| 946 | if (md) |
| 947 | md->version[i] = 1; |
| 948 | } |
| 949 | |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 950 | /* Read back first? */ |
Brian Norris | 623978d | 2011-09-20 18:35:34 -0700 | [diff] [blame] | 951 | if (rd) { |
| 952 | res = read_abs_bbt(mtd, buf, rd, chipsel); |
| 953 | if (mtd_is_eccerr(res)) { |
| 954 | /* Mark table as invalid */ |
| 955 | rd->pages[i] = -1; |
Brian Norris | dadc17a | 2011-09-20 18:35:57 -0700 | [diff] [blame] | 956 | rd->version[i] = 0; |
Brian Norris | 623978d | 2011-09-20 18:35:34 -0700 | [diff] [blame] | 957 | i--; |
| 958 | continue; |
| 959 | } |
| 960 | } |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 961 | /* If they weren't versioned, read both */ |
Brian Norris | 623978d | 2011-09-20 18:35:34 -0700 | [diff] [blame] | 962 | if (rd2) { |
| 963 | res2 = read_abs_bbt(mtd, buf, rd2, chipsel); |
| 964 | if (mtd_is_eccerr(res2)) { |
| 965 | /* Mark table as invalid */ |
| 966 | rd2->pages[i] = -1; |
Brian Norris | dadc17a | 2011-09-20 18:35:57 -0700 | [diff] [blame] | 967 | rd2->version[i] = 0; |
Brian Norris | 623978d | 2011-09-20 18:35:34 -0700 | [diff] [blame] | 968 | i--; |
| 969 | continue; |
| 970 | } |
| 971 | } |
| 972 | |
| 973 | /* Scrub the flash table(s)? */ |
| 974 | if (mtd_is_bitflip(res) || mtd_is_bitflip(res2)) |
| 975 | writeops = 0x03; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 976 | |
Brian Norris | dadc17a | 2011-09-20 18:35:57 -0700 | [diff] [blame] | 977 | /* Update version numbers before writing */ |
| 978 | if (md) { |
| 979 | td->version[i] = max(td->version[i], md->version[i]); |
| 980 | md->version[i] = td->version[i]; |
| 981 | } |
| 982 | |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 983 | /* Write the bad block table to the device? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | if ((writeops & 0x01) && (td->options & NAND_BBT_WRITE)) { |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 985 | res = write_bbt(mtd, buf, td, md, chipsel); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 986 | if (res < 0) |
| 987 | return res; |
| 988 | } |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 989 | |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 990 | /* Write the mirror bad block table to the device? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | if ((writeops & 0x02) && md && (md->options & NAND_BBT_WRITE)) { |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 992 | res = write_bbt(mtd, buf, md, td, chipsel); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | if (res < 0) |
| 994 | return res; |
| 995 | } |
| 996 | } |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 997 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 998 | } |
| 999 | |
| 1000 | /** |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 1001 | * mark_bbt_regions - [GENERIC] mark the bad block table regions |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 1002 | * @mtd: MTD device structure |
| 1003 | * @td: bad block table descriptor |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | * |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 1005 | * The bad block table regions are marked as "bad" to prevent accidental |
| 1006 | * erasures / writes. The regions are identified by the mark 0x02. |
| 1007 | */ |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 1008 | static void mark_bbt_region(struct mtd_info *mtd, struct nand_bbt_descr *td) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1009 | { |
| 1010 | struct nand_chip *this = mtd->priv; |
| 1011 | int i, j, chips, block, nrblocks, update; |
| 1012 | uint8_t oldval, newval; |
| 1013 | |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 1014 | /* Do we have a bbt per chip? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1015 | if (td->options & NAND_BBT_PERCHIP) { |
| 1016 | chips = this->numchips; |
| 1017 | nrblocks = (int)(this->chipsize >> this->bbt_erase_shift); |
| 1018 | } else { |
| 1019 | chips = 1; |
| 1020 | nrblocks = (int)(mtd->size >> this->bbt_erase_shift); |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 1021 | } |
| 1022 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1023 | for (i = 0; i < chips; i++) { |
| 1024 | if ((td->options & NAND_BBT_ABSPAGE) || |
| 1025 | !(td->options & NAND_BBT_WRITE)) { |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 1026 | if (td->pages[i] == -1) |
| 1027 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1028 | block = td->pages[i] >> (this->bbt_erase_shift - this->page_shift); |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 1029 | block <<= 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1030 | oldval = this->bbt[(block >> 3)]; |
| 1031 | newval = oldval | (0x2 << (block & 0x06)); |
| 1032 | this->bbt[(block >> 3)] = newval; |
| 1033 | if ((oldval != newval) && td->reserved_block_code) |
Adrian Hunter | 69423d9 | 2008-12-10 13:37:21 +0000 | [diff] [blame] | 1034 | nand_update_bbt(mtd, (loff_t)block << (this->bbt_erase_shift - 1)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1035 | continue; |
| 1036 | } |
| 1037 | update = 0; |
| 1038 | if (td->options & NAND_BBT_LASTBLOCK) |
| 1039 | block = ((i + 1) * nrblocks) - td->maxblocks; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 1040 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1041 | block = i * nrblocks; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 1042 | block <<= 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1043 | for (j = 0; j < td->maxblocks; j++) { |
| 1044 | oldval = this->bbt[(block >> 3)]; |
| 1045 | newval = oldval | (0x2 << (block & 0x06)); |
| 1046 | this->bbt[(block >> 3)] = newval; |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 1047 | if (oldval != newval) |
| 1048 | update = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1049 | block += 2; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 1050 | } |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 1051 | /* |
| 1052 | * If we want reserved blocks to be recorded to flash, and some |
| 1053 | * new ones have been marked, then we need to update the stored |
| 1054 | * bbts. This should only happen once. |
| 1055 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1056 | if (update && td->reserved_block_code) |
Adrian Hunter | 69423d9 | 2008-12-10 13:37:21 +0000 | [diff] [blame] | 1057 | nand_update_bbt(mtd, (loff_t)(block - 2) << (this->bbt_erase_shift - 1)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1058 | } |
| 1059 | } |
| 1060 | |
| 1061 | /** |
Sebastian Andrzej Siewior | 7cba7b1 | 2010-09-30 21:28:01 +0200 | [diff] [blame] | 1062 | * verify_bbt_descr - verify the bad block description |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 1063 | * @mtd: MTD device structure |
| 1064 | * @bd: the table to verify |
Sebastian Andrzej Siewior | 7cba7b1 | 2010-09-30 21:28:01 +0200 | [diff] [blame] | 1065 | * |
| 1066 | * This functions performs a few sanity checks on the bad block description |
| 1067 | * table. |
| 1068 | */ |
| 1069 | static void verify_bbt_descr(struct mtd_info *mtd, struct nand_bbt_descr *bd) |
| 1070 | { |
| 1071 | struct nand_chip *this = mtd->priv; |
Stanislav Fomichev | 7912a5e | 2011-02-07 23:48:25 +0300 | [diff] [blame] | 1072 | u32 pattern_len; |
| 1073 | u32 bits; |
Sebastian Andrzej Siewior | 7cba7b1 | 2010-09-30 21:28:01 +0200 | [diff] [blame] | 1074 | u32 table_size; |
| 1075 | |
| 1076 | if (!bd) |
| 1077 | return; |
Stanislav Fomichev | 7912a5e | 2011-02-07 23:48:25 +0300 | [diff] [blame] | 1078 | |
| 1079 | pattern_len = bd->len; |
| 1080 | bits = bd->options & NAND_BBT_NRBITS_MSK; |
| 1081 | |
Brian Norris | a40f734 | 2011-05-31 16:31:22 -0700 | [diff] [blame] | 1082 | BUG_ON((this->bbt_options & NAND_BBT_NO_OOB) && |
Brian Norris | bb9ebd4 | 2011-05-31 16:31:23 -0700 | [diff] [blame] | 1083 | !(this->bbt_options & NAND_BBT_USE_FLASH)); |
Sebastian Andrzej Siewior | 7cba7b1 | 2010-09-30 21:28:01 +0200 | [diff] [blame] | 1084 | BUG_ON(!bits); |
| 1085 | |
| 1086 | if (bd->options & NAND_BBT_VERSION) |
| 1087 | pattern_len++; |
| 1088 | |
| 1089 | if (bd->options & NAND_BBT_NO_OOB) { |
Brian Norris | bb9ebd4 | 2011-05-31 16:31:23 -0700 | [diff] [blame] | 1090 | BUG_ON(!(this->bbt_options & NAND_BBT_USE_FLASH)); |
Brian Norris | a40f734 | 2011-05-31 16:31:22 -0700 | [diff] [blame] | 1091 | BUG_ON(!(this->bbt_options & NAND_BBT_NO_OOB)); |
Sebastian Andrzej Siewior | 7cba7b1 | 2010-09-30 21:28:01 +0200 | [diff] [blame] | 1092 | BUG_ON(bd->offs); |
| 1093 | if (bd->options & NAND_BBT_VERSION) |
| 1094 | BUG_ON(bd->veroffs != bd->len); |
| 1095 | BUG_ON(bd->options & NAND_BBT_SAVECONTENT); |
| 1096 | } |
| 1097 | |
| 1098 | if (bd->options & NAND_BBT_PERCHIP) |
| 1099 | table_size = this->chipsize >> this->bbt_erase_shift; |
| 1100 | else |
| 1101 | table_size = mtd->size >> this->bbt_erase_shift; |
| 1102 | table_size >>= 3; |
| 1103 | table_size *= bits; |
| 1104 | if (bd->options & NAND_BBT_NO_OOB) |
| 1105 | table_size += pattern_len; |
| 1106 | BUG_ON(table_size > (1 << this->bbt_erase_shift)); |
| 1107 | } |
| 1108 | |
| 1109 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1110 | * nand_scan_bbt - [NAND Interface] scan, find, read and maybe create bad block table(s) |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 1111 | * @mtd: MTD device structure |
| 1112 | * @bd: descriptor for the good/bad block search pattern |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1113 | * |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 1114 | * The function checks, if a bad block table(s) is/are already available. If |
| 1115 | * not it scans the device for manufacturer marked good / bad blocks and writes |
| 1116 | * the bad block table(s) to the selected place. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1117 | * |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 1118 | * The bad block table memory is allocated here. It must be freed by calling |
| 1119 | * the nand_free_bbt function. |
| 1120 | */ |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 1121 | int nand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1122 | { |
| 1123 | struct nand_chip *this = mtd->priv; |
| 1124 | int len, res = 0; |
| 1125 | uint8_t *buf; |
| 1126 | struct nand_bbt_descr *td = this->bbt_td; |
| 1127 | struct nand_bbt_descr *md = this->bbt_md; |
| 1128 | |
| 1129 | len = mtd->size >> (this->bbt_erase_shift + 2); |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 1130 | /* |
| 1131 | * Allocate memory (2bit per block) and clear the memory bad block |
| 1132 | * table. |
| 1133 | */ |
Burman Yan | 95b93a0 | 2006-11-15 21:10:29 +0200 | [diff] [blame] | 1134 | this->bbt = kzalloc(len, GFP_KERNEL); |
Brian Norris | 0870066 | 2011-06-07 16:01:54 -0700 | [diff] [blame] | 1135 | if (!this->bbt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1136 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1137 | |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 1138 | /* |
| 1139 | * If no primary table decriptor is given, scan the device to build a |
| 1140 | * memory based bad block table. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1141 | */ |
Artem B. Bityuckiy | eeada24 | 2005-02-11 10:14:15 +0000 | [diff] [blame] | 1142 | if (!td) { |
| 1143 | if ((res = nand_memory_bbt(mtd, bd))) { |
Brian Norris | d037021 | 2011-07-19 10:06:08 -0700 | [diff] [blame] | 1144 | pr_err("nand_bbt: can't scan flash and build the RAM-based BBT\n"); |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 1145 | kfree(this->bbt); |
Artem B. Bityuckiy | eeada24 | 2005-02-11 10:14:15 +0000 | [diff] [blame] | 1146 | this->bbt = NULL; |
| 1147 | } |
| 1148 | return res; |
| 1149 | } |
Sebastian Andrzej Siewior | 7cba7b1 | 2010-09-30 21:28:01 +0200 | [diff] [blame] | 1150 | verify_bbt_descr(mtd, td); |
| 1151 | verify_bbt_descr(mtd, md); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1152 | |
| 1153 | /* Allocate a temporary buffer for one eraseblock incl. oob */ |
| 1154 | len = (1 << this->bbt_erase_shift); |
| 1155 | len += (len >> this->page_shift) * mtd->oobsize; |
David Woodhouse | c3f8abf | 2006-05-13 04:03:42 +0100 | [diff] [blame] | 1156 | buf = vmalloc(len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1157 | if (!buf) { |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 1158 | kfree(this->bbt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1159 | this->bbt = NULL; |
| 1160 | return -ENOMEM; |
| 1161 | } |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 1162 | |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 1163 | /* Is the bbt at a given page? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1164 | if (td->options & NAND_BBT_ABSPAGE) { |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 1165 | res = read_abs_bbts(mtd, buf, td, md); |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 1166 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1167 | /* Search the bad block table using a pattern in oob */ |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 1168 | res = search_read_bbts(mtd, buf, td, md); |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 1169 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1170 | |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 1171 | if (res) |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 1172 | res = check_create(mtd, buf, bd); |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 1173 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1174 | /* Prevent the bbt regions from erasing / writing */ |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 1175 | mark_bbt_region(mtd, td); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1176 | if (md) |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 1177 | mark_bbt_region(mtd, md); |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 1178 | |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 1179 | vfree(buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1180 | return res; |
| 1181 | } |
| 1182 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1183 | /** |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 1184 | * nand_update_bbt - [NAND Interface] update bad block table(s) |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 1185 | * @mtd: MTD device structure |
| 1186 | * @offs: the offset of the newly marked block |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1187 | * |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 1188 | * The function updates the bad block table(s). |
| 1189 | */ |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 1190 | int nand_update_bbt(struct mtd_info *mtd, loff_t offs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1191 | { |
| 1192 | struct nand_chip *this = mtd->priv; |
Brian Norris | 1196ac5 | 2011-09-07 13:13:32 -0700 | [diff] [blame] | 1193 | int len, res = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1194 | int chip, chipsel; |
| 1195 | uint8_t *buf; |
| 1196 | struct nand_bbt_descr *td = this->bbt_td; |
| 1197 | struct nand_bbt_descr *md = this->bbt_md; |
| 1198 | |
| 1199 | if (!this->bbt || !td) |
| 1200 | return -EINVAL; |
| 1201 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1202 | /* Allocate a temporary buffer for one eraseblock incl. oob */ |
| 1203 | len = (1 << this->bbt_erase_shift); |
| 1204 | len += (len >> this->page_shift) * mtd->oobsize; |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 1205 | buf = kmalloc(len, GFP_KERNEL); |
Brian Norris | 0870066 | 2011-06-07 16:01:54 -0700 | [diff] [blame] | 1206 | if (!buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1207 | return -ENOMEM; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 1208 | |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 1209 | /* Do we have a bbt per chip? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1210 | if (td->options & NAND_BBT_PERCHIP) { |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 1211 | chip = (int)(offs >> this->chip_shift); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1212 | chipsel = chip; |
| 1213 | } else { |
| 1214 | chip = 0; |
| 1215 | chipsel = -1; |
| 1216 | } |
| 1217 | |
| 1218 | td->version[chip]++; |
| 1219 | if (md) |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 1220 | md->version[chip]++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1221 | |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 1222 | /* Write the bad block table to the device? */ |
Brian Norris | 1196ac5 | 2011-09-07 13:13:32 -0700 | [diff] [blame] | 1223 | if (td->options & NAND_BBT_WRITE) { |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 1224 | res = write_bbt(mtd, buf, td, md, chipsel); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1225 | if (res < 0) |
| 1226 | goto out; |
| 1227 | } |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 1228 | /* Write the mirror bad block table to the device? */ |
Brian Norris | 1196ac5 | 2011-09-07 13:13:32 -0700 | [diff] [blame] | 1229 | if (md && (md->options & NAND_BBT_WRITE)) { |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 1230 | res = write_bbt(mtd, buf, md, td, chipsel); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1231 | } |
| 1232 | |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 1233 | out: |
| 1234 | kfree(buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1235 | return res; |
| 1236 | } |
| 1237 | |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 1238 | /* |
| 1239 | * Define some generic bad / good block scan pattern which are used |
| 1240 | * while scanning a device for factory marked good / bad blocks. |
| 1241 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1242 | static uint8_t scan_ff_pattern[] = { 0xff, 0xff }; |
| 1243 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1244 | static uint8_t scan_agand_pattern[] = { 0x1C, 0x71, 0xC7, 0x1C, 0x71, 0xC7 }; |
| 1245 | |
| 1246 | static struct nand_bbt_descr agand_flashbased = { |
| 1247 | .options = NAND_BBT_SCANEMPTY | NAND_BBT_SCANALLPAGES, |
| 1248 | .offs = 0x20, |
| 1249 | .len = 6, |
| 1250 | .pattern = scan_agand_pattern |
| 1251 | }; |
| 1252 | |
Brian Norris | 7854d3f | 2011-06-23 14:12:08 -0700 | [diff] [blame] | 1253 | /* Generic flash bbt descriptors */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1254 | static uint8_t bbt_pattern[] = {'B', 'b', 't', '0' }; |
| 1255 | static uint8_t mirror_pattern[] = {'1', 't', 'b', 'B' }; |
| 1256 | |
| 1257 | static struct nand_bbt_descr bbt_main_descr = { |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 1258 | .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1259 | | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP, |
| 1260 | .offs = 8, |
| 1261 | .len = 4, |
| 1262 | .veroffs = 12, |
| 1263 | .maxblocks = 4, |
| 1264 | .pattern = bbt_pattern |
| 1265 | }; |
| 1266 | |
| 1267 | static struct nand_bbt_descr bbt_mirror_descr = { |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 1268 | .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1269 | | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP, |
| 1270 | .offs = 8, |
| 1271 | .len = 4, |
| 1272 | .veroffs = 12, |
| 1273 | .maxblocks = 4, |
| 1274 | .pattern = mirror_pattern |
| 1275 | }; |
| 1276 | |
Sebastian Andrzej Siewior | 7cba7b1 | 2010-09-30 21:28:01 +0200 | [diff] [blame] | 1277 | static struct nand_bbt_descr bbt_main_no_bbt_descr = { |
| 1278 | .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
| 1279 | | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP |
| 1280 | | NAND_BBT_NO_OOB, |
| 1281 | .len = 4, |
| 1282 | .veroffs = 4, |
| 1283 | .maxblocks = 4, |
| 1284 | .pattern = bbt_pattern |
| 1285 | }; |
| 1286 | |
| 1287 | static struct nand_bbt_descr bbt_mirror_no_bbt_descr = { |
| 1288 | .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
| 1289 | | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP |
| 1290 | | NAND_BBT_NO_OOB, |
| 1291 | .len = 4, |
| 1292 | .veroffs = 4, |
| 1293 | .maxblocks = 4, |
| 1294 | .pattern = mirror_pattern |
| 1295 | }; |
| 1296 | |
Brian Norris | 752ed6c | 2011-09-20 18:36:42 -0700 | [diff] [blame] | 1297 | #define BADBLOCK_SCAN_MASK (~NAND_BBT_NO_OOB) |
Brian Norris | 58373ff | 2010-07-15 12:15:44 -0700 | [diff] [blame] | 1298 | /** |
Brian Norris | 752ed6c | 2011-09-20 18:36:42 -0700 | [diff] [blame] | 1299 | * nand_create_badblock_pattern - [INTERN] Creates a BBT descriptor structure |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 1300 | * @this: NAND chip to create descriptor for |
Brian Norris | 58373ff | 2010-07-15 12:15:44 -0700 | [diff] [blame] | 1301 | * |
| 1302 | * This function allocates and initializes a nand_bbt_descr for BBM detection |
Brian Norris | 752ed6c | 2011-09-20 18:36:42 -0700 | [diff] [blame] | 1303 | * based on the properties of @this. The new descriptor is stored in |
Brian Norris | 58373ff | 2010-07-15 12:15:44 -0700 | [diff] [blame] | 1304 | * this->badblock_pattern. Thus, this->badblock_pattern should be NULL when |
| 1305 | * passed to this function. |
Brian Norris | 58373ff | 2010-07-15 12:15:44 -0700 | [diff] [blame] | 1306 | */ |
Brian Norris | 752ed6c | 2011-09-20 18:36:42 -0700 | [diff] [blame] | 1307 | static int nand_create_badblock_pattern(struct nand_chip *this) |
Brian Norris | 58373ff | 2010-07-15 12:15:44 -0700 | [diff] [blame] | 1308 | { |
| 1309 | struct nand_bbt_descr *bd; |
| 1310 | if (this->badblock_pattern) { |
Brian Norris | 752ed6c | 2011-09-20 18:36:42 -0700 | [diff] [blame] | 1311 | pr_warn("Bad block pattern already allocated; not replacing\n"); |
Brian Norris | 58373ff | 2010-07-15 12:15:44 -0700 | [diff] [blame] | 1312 | return -EINVAL; |
| 1313 | } |
| 1314 | bd = kzalloc(sizeof(*bd), GFP_KERNEL); |
Brian Norris | 0870066 | 2011-06-07 16:01:54 -0700 | [diff] [blame] | 1315 | if (!bd) |
Brian Norris | 58373ff | 2010-07-15 12:15:44 -0700 | [diff] [blame] | 1316 | return -ENOMEM; |
Brian Norris | 752ed6c | 2011-09-20 18:36:42 -0700 | [diff] [blame] | 1317 | bd->options = this->bbt_options & BADBLOCK_SCAN_MASK; |
Brian Norris | 58373ff | 2010-07-15 12:15:44 -0700 | [diff] [blame] | 1318 | bd->offs = this->badblockpos; |
| 1319 | bd->len = (this->options & NAND_BUSWIDTH_16) ? 2 : 1; |
| 1320 | bd->pattern = scan_ff_pattern; |
| 1321 | bd->options |= NAND_BBT_DYNAMICSTRUCT; |
| 1322 | this->badblock_pattern = bd; |
| 1323 | return 0; |
| 1324 | } |
| 1325 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1326 | /** |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 1327 | * nand_default_bbt - [NAND Interface] Select a default bad block table for the device |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 1328 | * @mtd: MTD device structure |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1329 | * |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 1330 | * This function selects the default bad block table support for the device and |
| 1331 | * calls the nand_scan_bbt function. |
| 1332 | */ |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 1333 | int nand_default_bbt(struct mtd_info *mtd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1334 | { |
| 1335 | struct nand_chip *this = mtd->priv; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 1336 | |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 1337 | /* |
| 1338 | * Default for AG-AND. We must use a flash based bad block table as the |
| 1339 | * devices have factory marked _good_ blocks. Erasing those blocks |
| 1340 | * leads to loss of the good / bad information, so we _must_ store this |
| 1341 | * information in a good / bad table during startup. |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 1342 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1343 | if (this->options & NAND_IS_AND) { |
| 1344 | /* Use the default pattern descriptors */ |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 1345 | if (!this->bbt_td) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1346 | this->bbt_td = &bbt_main_descr; |
| 1347 | this->bbt_md = &bbt_mirror_descr; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 1348 | } |
Brian Norris | bb9ebd4 | 2011-05-31 16:31:23 -0700 | [diff] [blame] | 1349 | this->bbt_options |= NAND_BBT_USE_FLASH; |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 1350 | return nand_scan_bbt(mtd, &agand_flashbased); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1351 | } |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 1352 | |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 1353 | /* Is a flash based bad block table requested? */ |
Brian Norris | bb9ebd4 | 2011-05-31 16:31:23 -0700 | [diff] [blame] | 1354 | if (this->bbt_options & NAND_BBT_USE_FLASH) { |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 1355 | /* Use the default pattern descriptors */ |
| 1356 | if (!this->bbt_td) { |
Brian Norris | a40f734 | 2011-05-31 16:31:22 -0700 | [diff] [blame] | 1357 | if (this->bbt_options & NAND_BBT_NO_OOB) { |
Sebastian Andrzej Siewior | 7cba7b1 | 2010-09-30 21:28:01 +0200 | [diff] [blame] | 1358 | this->bbt_td = &bbt_main_no_bbt_descr; |
| 1359 | this->bbt_md = &bbt_mirror_no_bbt_descr; |
| 1360 | } else { |
| 1361 | this->bbt_td = &bbt_main_descr; |
| 1362 | this->bbt_md = &bbt_mirror_descr; |
| 1363 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1364 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1365 | } else { |
| 1366 | this->bbt_td = NULL; |
| 1367 | this->bbt_md = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1368 | } |
Brian Norris | a2f812d | 2011-03-18 21:53:42 -0700 | [diff] [blame] | 1369 | |
| 1370 | if (!this->badblock_pattern) |
Brian Norris | 752ed6c | 2011-09-20 18:36:42 -0700 | [diff] [blame] | 1371 | nand_create_badblock_pattern(this); |
Brian Norris | a2f812d | 2011-03-18 21:53:42 -0700 | [diff] [blame] | 1372 | |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 1373 | return nand_scan_bbt(mtd, this->badblock_pattern); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1374 | } |
| 1375 | |
| 1376 | /** |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 1377 | * nand_isbad_bbt - [NAND Interface] Check if a block is bad |
Brian Norris | 8b6e50c | 2011-05-25 14:59:01 -0700 | [diff] [blame] | 1378 | * @mtd: MTD device structure |
| 1379 | * @offs: offset in the device |
| 1380 | * @allowbbt: allow access to bad block table region |
| 1381 | */ |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 1382 | int nand_isbad_bbt(struct mtd_info *mtd, loff_t offs, int allowbbt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1383 | { |
| 1384 | struct nand_chip *this = mtd->priv; |
| 1385 | int block; |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 1386 | uint8_t res; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame] | 1387 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1388 | /* Get block number * 2 */ |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 1389 | block = (int)(offs >> (this->bbt_erase_shift - 1)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1390 | res = (this->bbt[block >> 3] >> (block & 0x06)) & 0x03; |
| 1391 | |
Brian Norris | 289c052 | 2011-07-19 10:06:09 -0700 | [diff] [blame] | 1392 | pr_debug("nand_isbad_bbt(): bbt info for offs 0x%08x: " |
| 1393 | "(block %d) 0x%02x\n", |
| 1394 | (unsigned int)offs, block >> 1, res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1395 | |
| 1396 | switch ((int)res) { |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 1397 | case 0x00: |
| 1398 | return 0; |
| 1399 | case 0x01: |
| 1400 | return 1; |
| 1401 | case 0x02: |
| 1402 | return allowbbt ? 0 : 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1403 | } |
| 1404 | return 1; |
| 1405 | } |
| 1406 | |
David Woodhouse | e0c7d76 | 2006-05-13 18:07:53 +0100 | [diff] [blame] | 1407 | EXPORT_SYMBOL(nand_scan_bbt); |
| 1408 | EXPORT_SYMBOL(nand_default_bbt); |