Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Overview: |
3 | * Bad block table support for the NAND driver | |
61b03bd7 | 4 | * |
d159c4e5 | 5 | * Copyright © 2004 Thomas Gleixner (tglx@linutronix.de) |
1da177e4 | 6 | * |
1da177e4 LT |
7 | * This program is free software; you can redistribute it and/or modify |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | * Description: | |
12 | * | |
61b03bd7 | 13 | * When nand_scan_bbt is called, then it tries to find the bad block table |
7cba7b14 | 14 | * depending on the options in the BBT descriptor(s). If no flash based BBT |
bb9ebd4e | 15 | * (NAND_BBT_USE_FLASH) is specified then the device is scanned for factory |
7cba7b14 SAS |
16 | * marked good / bad blocks. This information is used to create a memory BBT. |
17 | * Once a new bad block is discovered then the "factory" information is updated | |
18 | * on the device. | |
19 | * If a flash based BBT is specified then the function first tries to find the | |
20 | * BBT on flash. If a BBT is found then the contents are read and the memory | |
21 | * based BBT is created. If a mirrored BBT is selected then the mirror is | |
22 | * searched too and the versions are compared. If the mirror has a greater | |
44ed0ffd | 23 | * version number, then the mirror BBT is used to build the memory based BBT. |
1da177e4 | 24 | * If the tables are not versioned, then we "or" the bad block information. |
7cba7b14 SAS |
25 | * If one of the BBTs is out of date or does not exist it is (re)created. |
26 | * If no BBT exists at all then the device is scanned for factory marked | |
61b03bd7 | 27 | * good / bad blocks and the bad block tables are created. |
1da177e4 | 28 | * |
7cba7b14 SAS |
29 | * For manufacturer created BBTs like the one found on M-SYS DOC devices |
30 | * the BBT is searched and read but never created | |
1da177e4 | 31 | * |
7cba7b14 | 32 | * The auto generated bad block table is located in the last good blocks |
61b03bd7 | 33 | * of the device. The table is mirrored, so it can be updated eventually. |
7cba7b14 SAS |
34 | * The table is marked in the OOB area with an ident pattern and a version |
35 | * number which indicates which of both tables is more up to date. If the NAND | |
36 | * controller needs the complete OOB area for the ECC information then the | |
bb9ebd4e | 37 | * option NAND_BBT_NO_OOB should be used (along with NAND_BBT_USE_FLASH, of |
a40f7341 BN |
38 | * course): it moves the ident pattern and the version byte into the data area |
39 | * and the OOB area will remain untouched. | |
1da177e4 LT |
40 | * |
41 | * The table uses 2 bits per block | |
7cba7b14 SAS |
42 | * 11b: block is good |
43 | * 00b: block is factory marked bad | |
44 | * 01b, 10b: block is marked bad due to wear | |
1da177e4 LT |
45 | * |
46 | * The memory bad block table uses the following scheme: | |
47 | * 00b: block is good | |
48 | * 01b: block is marked bad due to wear | |
49 | * 10b: block is reserved (to protect the bbt area) | |
50 | * 11b: block is factory marked bad | |
61b03bd7 | 51 | * |
1da177e4 LT |
52 | * Multichip devices like DOC store the bad block info per floor. |
53 | * | |
54 | * Following assumptions are made: | |
55 | * - bbts start at a page boundary, if autolocated on a block boundary | |
e0c7d767 | 56 | * - the space necessary for a bbt in FLASH does not exceed a block boundary |
61b03bd7 | 57 | * |
1da177e4 LT |
58 | */ |
59 | ||
60 | #include <linux/slab.h> | |
61 | #include <linux/types.h> | |
62 | #include <linux/mtd/mtd.h> | |
61de9da6 | 63 | #include <linux/mtd/bbm.h> |
1da177e4 | 64 | #include <linux/mtd/nand.h> |
1da177e4 LT |
65 | #include <linux/bitops.h> |
66 | #include <linux/delay.h> | |
c3f8abf4 | 67 | #include <linux/vmalloc.h> |
f3bcc017 | 68 | #include <linux/export.h> |
491ed06f | 69 | #include <linux/string.h> |
1da177e4 | 70 | |
771c568b BN |
71 | #define BBT_BLOCK_GOOD 0x00 |
72 | #define BBT_BLOCK_WORN 0x01 | |
73 | #define BBT_BLOCK_RESERVED 0x02 | |
74 | #define BBT_BLOCK_FACTORY_BAD 0x03 | |
75 | ||
76 | #define BBT_ENTRY_MASK 0x03 | |
77 | #define BBT_ENTRY_SHIFT 2 | |
78 | ||
b32843b7 BN |
79 | static int nand_update_bbt(struct mtd_info *mtd, loff_t offs); |
80 | ||
771c568b BN |
81 | static inline uint8_t bbt_get_entry(struct nand_chip *chip, int block) |
82 | { | |
83 | uint8_t entry = chip->bbt[block >> BBT_ENTRY_SHIFT]; | |
84 | entry >>= (block & BBT_ENTRY_MASK) * 2; | |
85 | return entry & BBT_ENTRY_MASK; | |
86 | } | |
87 | ||
88 | static inline void bbt_mark_entry(struct nand_chip *chip, int block, | |
89 | uint8_t mark) | |
90 | { | |
91 | uint8_t msk = (mark & BBT_ENTRY_MASK) << ((block & BBT_ENTRY_MASK) * 2); | |
92 | chip->bbt[block >> BBT_ENTRY_SHIFT] |= msk; | |
93 | } | |
94 | ||
7cba7b14 SAS |
95 | static int check_pattern_no_oob(uint8_t *buf, struct nand_bbt_descr *td) |
96 | { | |
718894ad BN |
97 | if (memcmp(buf, td->pattern, td->len)) |
98 | return -1; | |
99 | return 0; | |
7cba7b14 SAS |
100 | } |
101 | ||
61b03bd7 | 102 | /** |
1da177e4 | 103 | * check_pattern - [GENERIC] check if a pattern is in the buffer |
8b6e50c9 BN |
104 | * @buf: the buffer to search |
105 | * @len: the length of buffer to search | |
106 | * @paglen: the pagelength | |
107 | * @td: search pattern descriptor | |
1da177e4 | 108 | * |
8b6e50c9 | 109 | * Check for a pattern at the given place. Used to search bad block tables and |
dad22562 | 110 | * good / bad block identifiers. |
8b6e50c9 | 111 | */ |
e0c7d767 | 112 | static int check_pattern(uint8_t *buf, int len, int paglen, struct nand_bbt_descr *td) |
1da177e4 | 113 | { |
7cba7b14 SAS |
114 | if (td->options & NAND_BBT_NO_OOB) |
115 | return check_pattern_no_oob(buf, td); | |
116 | ||
1da177e4 | 117 | /* Compare the pattern */ |
dad22562 | 118 | if (memcmp(buf + paglen + td->offs, td->pattern, td->len)) |
75b66d8c | 119 | return -1; |
58373ff0 | 120 | |
1da177e4 LT |
121 | return 0; |
122 | } | |
123 | ||
61b03bd7 | 124 | /** |
c9e05365 | 125 | * check_short_pattern - [GENERIC] check if a pattern is in the buffer |
8b6e50c9 BN |
126 | * @buf: the buffer to search |
127 | * @td: search pattern descriptor | |
c9e05365 | 128 | * |
8b6e50c9 BN |
129 | * Check for a pattern at the given place. Used to search bad block tables and |
130 | * good / bad block identifiers. Same as check_pattern, but no optional empty | |
131 | * check. | |
132 | */ | |
e0c7d767 | 133 | static int check_short_pattern(uint8_t *buf, struct nand_bbt_descr *td) |
c9e05365 | 134 | { |
c9e05365 | 135 | /* Compare the pattern */ |
491ed06f BN |
136 | if (memcmp(buf + td->offs, td->pattern, td->len)) |
137 | return -1; | |
c9e05365 TG |
138 | return 0; |
139 | } | |
140 | ||
7cba7b14 SAS |
141 | /** |
142 | * add_marker_len - compute the length of the marker in data area | |
8b6e50c9 | 143 | * @td: BBT descriptor used for computation |
7cba7b14 | 144 | * |
7854d3f7 | 145 | * The length will be 0 if the marker is located in OOB area. |
7cba7b14 SAS |
146 | */ |
147 | static u32 add_marker_len(struct nand_bbt_descr *td) | |
148 | { | |
149 | u32 len; | |
150 | ||
151 | if (!(td->options & NAND_BBT_NO_OOB)) | |
152 | return 0; | |
153 | ||
154 | len = td->len; | |
155 | if (td->options & NAND_BBT_VERSION) | |
156 | len++; | |
157 | return len; | |
158 | } | |
159 | ||
1da177e4 LT |
160 | /** |
161 | * read_bbt - [GENERIC] Read the bad block table starting from page | |
8b6e50c9 BN |
162 | * @mtd: MTD device structure |
163 | * @buf: temporary buffer | |
164 | * @page: the starting page | |
165 | * @num: the number of bbt descriptors to read | |
7854d3f7 | 166 | * @td: the bbt describtion table |
b4d20d60 | 167 | * @offs: block number offset in the table |
1da177e4 LT |
168 | * |
169 | * Read the bad block table starting from page. | |
1da177e4 | 170 | */ |
e0c7d767 | 171 | static int read_bbt(struct mtd_info *mtd, uint8_t *buf, int page, int num, |
df5b4e34 | 172 | struct nand_bbt_descr *td, int offs) |
1da177e4 | 173 | { |
167a8d52 | 174 | int res, ret = 0, i, j, act = 0; |
862eba51 | 175 | struct nand_chip *this = mtd_to_nand(mtd); |
1da177e4 LT |
176 | size_t retlen, len, totlen; |
177 | loff_t from; | |
df5b4e34 | 178 | int bits = td->options & NAND_BBT_NRBITS_MSK; |
596d7452 | 179 | uint8_t msk = (uint8_t)((1 << bits) - 1); |
7cba7b14 | 180 | u32 marker_len; |
df5b4e34 | 181 | int reserved_block_code = td->reserved_block_code; |
1da177e4 LT |
182 | |
183 | totlen = (num * bits) >> 3; | |
7cba7b14 | 184 | marker_len = add_marker_len(td); |
596d7452 | 185 | from = ((loff_t)page) << this->page_shift; |
61b03bd7 | 186 | |
1da177e4 | 187 | while (totlen) { |
596d7452 | 188 | len = min(totlen, (size_t)(1 << this->bbt_erase_shift)); |
7cba7b14 SAS |
189 | if (marker_len) { |
190 | /* | |
191 | * In case the BBT marker is not in the OOB area it | |
192 | * will be just in the first page. | |
193 | */ | |
194 | len -= marker_len; | |
195 | from += marker_len; | |
196 | marker_len = 0; | |
197 | } | |
329ad399 | 198 | res = mtd_read(mtd, from, len, &retlen, buf); |
1da177e4 | 199 | if (res < 0) { |
167a8d52 | 200 | if (mtd_is_eccerr(res)) { |
2ac63d90 RM |
201 | pr_info("nand_bbt: ECC error in BBT at 0x%012llx\n", |
202 | from & ~mtd->writesize); | |
167a8d52 BN |
203 | return res; |
204 | } else if (mtd_is_bitflip(res)) { | |
2ac63d90 RM |
205 | pr_info("nand_bbt: corrected error in BBT at 0x%012llx\n", |
206 | from & ~mtd->writesize); | |
167a8d52 BN |
207 | ret = res; |
208 | } else { | |
209 | pr_info("nand_bbt: error reading BBT\n"); | |
1da177e4 LT |
210 | return res; |
211 | } | |
61b03bd7 | 212 | } |
1da177e4 LT |
213 | |
214 | /* Analyse data */ | |
215 | for (i = 0; i < len; i++) { | |
216 | uint8_t dat = buf[i]; | |
b4d20d60 | 217 | for (j = 0; j < 8; j += bits, act++) { |
1da177e4 LT |
218 | uint8_t tmp = (dat >> j) & msk; |
219 | if (tmp == msk) | |
220 | continue; | |
e0c7d767 | 221 | if (reserved_block_code && (tmp == reserved_block_code)) { |
d0370219 | 222 | pr_info("nand_read_bbt: reserved block at 0x%012llx\n", |
b4d20d60 BN |
223 | (loff_t)(offs + act) << |
224 | this->bbt_erase_shift); | |
225 | bbt_mark_entry(this, offs + act, | |
771c568b | 226 | BBT_BLOCK_RESERVED); |
f1a28c02 | 227 | mtd->ecc_stats.bbtblocks++; |
1da177e4 LT |
228 | continue; |
229 | } | |
8b6e50c9 BN |
230 | /* |
231 | * Leave it for now, if it's matured we can | |
a0f5080e | 232 | * move this message to pr_debug. |
8b6e50c9 | 233 | */ |
d0370219 | 234 | pr_info("nand_read_bbt: bad block at 0x%012llx\n", |
b4d20d60 BN |
235 | (loff_t)(offs + act) << |
236 | this->bbt_erase_shift); | |
8b6e50c9 | 237 | /* Factory marked bad or worn out? */ |
1da177e4 | 238 | if (tmp == 0) |
b4d20d60 | 239 | bbt_mark_entry(this, offs + act, |
771c568b | 240 | BBT_BLOCK_FACTORY_BAD); |
1da177e4 | 241 | else |
b4d20d60 | 242 | bbt_mark_entry(this, offs + act, |
771c568b | 243 | BBT_BLOCK_WORN); |
f1a28c02 | 244 | mtd->ecc_stats.badblocks++; |
61b03bd7 | 245 | } |
1da177e4 LT |
246 | } |
247 | totlen -= len; | |
248 | from += len; | |
249 | } | |
167a8d52 | 250 | return ret; |
1da177e4 LT |
251 | } |
252 | ||
253 | /** | |
254 | * read_abs_bbt - [GENERIC] Read the bad block table starting at a given page | |
8b6e50c9 BN |
255 | * @mtd: MTD device structure |
256 | * @buf: temporary buffer | |
257 | * @td: descriptor for the bad block table | |
596d7452 | 258 | * @chip: read the table for a specific chip, -1 read all chips; applies only if |
8b6e50c9 | 259 | * NAND_BBT_PERCHIP option is set |
1da177e4 | 260 | * |
8b6e50c9 BN |
261 | * Read the bad block table for all chips starting at a given page. We assume |
262 | * that the bbt bits are in consecutive order. | |
263 | */ | |
e0c7d767 | 264 | static int read_abs_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td, int chip) |
1da177e4 | 265 | { |
862eba51 | 266 | struct nand_chip *this = mtd_to_nand(mtd); |
1da177e4 | 267 | int res = 0, i; |
1da177e4 | 268 | |
1da177e4 LT |
269 | if (td->options & NAND_BBT_PERCHIP) { |
270 | int offs = 0; | |
271 | for (i = 0; i < this->numchips; i++) { | |
272 | if (chip == -1 || chip == i) | |
df5b4e34 SAS |
273 | res = read_bbt(mtd, buf, td->pages[i], |
274 | this->chipsize >> this->bbt_erase_shift, | |
275 | td, offs); | |
1da177e4 LT |
276 | if (res) |
277 | return res; | |
b4d20d60 | 278 | offs += this->chipsize >> this->bbt_erase_shift; |
1da177e4 LT |
279 | } |
280 | } else { | |
df5b4e34 SAS |
281 | res = read_bbt(mtd, buf, td->pages[0], |
282 | mtd->size >> this->bbt_erase_shift, td, 0); | |
1da177e4 LT |
283 | if (res) |
284 | return res; | |
285 | } | |
286 | return 0; | |
287 | } | |
288 | ||
8b6e50c9 | 289 | /* BBT marker is in the first page, no OOB */ |
af69dcd3 | 290 | static int scan_read_data(struct mtd_info *mtd, uint8_t *buf, loff_t offs, |
7cba7b14 SAS |
291 | struct nand_bbt_descr *td) |
292 | { | |
293 | size_t retlen; | |
294 | size_t len; | |
295 | ||
296 | len = td->len; | |
297 | if (td->options & NAND_BBT_VERSION) | |
298 | len++; | |
299 | ||
329ad399 | 300 | return mtd_read(mtd, offs, len, &retlen, buf); |
7cba7b14 SAS |
301 | } |
302 | ||
a7e68834 | 303 | /** |
af69dcd3 | 304 | * scan_read_oob - [GENERIC] Scan data+OOB region to buffer |
a7e68834 BN |
305 | * @mtd: MTD device structure |
306 | * @buf: temporary buffer | |
307 | * @offs: offset at which to scan | |
308 | * @len: length of data region to read | |
309 | * | |
310 | * Scan read data from data+OOB. May traverse multiple pages, interleaving | |
311 | * page,OOB,page,OOB,... in buf. Completes transfer and returns the "strongest" | |
312 | * ECC condition (error or bitflip). May quit on the first (non-ECC) error. | |
313 | */ | |
af69dcd3 | 314 | static int scan_read_oob(struct mtd_info *mtd, uint8_t *buf, loff_t offs, |
8593fbc6 TG |
315 | size_t len) |
316 | { | |
317 | struct mtd_oob_ops ops; | |
a7e68834 | 318 | int res, ret = 0; |
8593fbc6 | 319 | |
a7e68834 | 320 | ops.mode = MTD_OPS_PLACE_OOB; |
8593fbc6 TG |
321 | ops.ooboffs = 0; |
322 | ops.ooblen = mtd->oobsize; | |
8593fbc6 | 323 | |
b64d39d8 | 324 | while (len > 0) { |
105513cc BN |
325 | ops.datbuf = buf; |
326 | ops.len = min(len, (size_t)mtd->writesize); | |
327 | ops.oobbuf = buf + ops.len; | |
b64d39d8 | 328 | |
fd2819bb | 329 | res = mtd_read_oob(mtd, offs, &ops); |
a7e68834 BN |
330 | if (res) { |
331 | if (!mtd_is_bitflip_or_eccerr(res)) | |
332 | return res; | |
333 | else if (mtd_is_eccerr(res) || !ret) | |
334 | ret = res; | |
335 | } | |
b64d39d8 ML |
336 | |
337 | buf += mtd->oobsize + mtd->writesize; | |
338 | len -= mtd->writesize; | |
34a5704d | 339 | offs += mtd->writesize; |
b64d39d8 | 340 | } |
a7e68834 | 341 | return ret; |
8593fbc6 TG |
342 | } |
343 | ||
af69dcd3 | 344 | static int scan_read(struct mtd_info *mtd, uint8_t *buf, loff_t offs, |
7cba7b14 SAS |
345 | size_t len, struct nand_bbt_descr *td) |
346 | { | |
347 | if (td->options & NAND_BBT_NO_OOB) | |
af69dcd3 | 348 | return scan_read_data(mtd, buf, offs, td); |
7cba7b14 | 349 | else |
af69dcd3 | 350 | return scan_read_oob(mtd, buf, offs, len); |
7cba7b14 SAS |
351 | } |
352 | ||
8b6e50c9 | 353 | /* Scan write data with oob to flash */ |
8593fbc6 TG |
354 | static int scan_write_bbt(struct mtd_info *mtd, loff_t offs, size_t len, |
355 | uint8_t *buf, uint8_t *oob) | |
356 | { | |
357 | struct mtd_oob_ops ops; | |
358 | ||
0612b9dd | 359 | ops.mode = MTD_OPS_PLACE_OOB; |
8593fbc6 TG |
360 | ops.ooboffs = 0; |
361 | ops.ooblen = mtd->oobsize; | |
362 | ops.datbuf = buf; | |
363 | ops.oobbuf = oob; | |
364 | ops.len = len; | |
365 | ||
a2cc5ba0 | 366 | return mtd_write_oob(mtd, offs, &ops); |
8593fbc6 TG |
367 | } |
368 | ||
7cba7b14 SAS |
369 | static u32 bbt_get_ver_offs(struct mtd_info *mtd, struct nand_bbt_descr *td) |
370 | { | |
371 | u32 ver_offs = td->veroffs; | |
372 | ||
373 | if (!(td->options & NAND_BBT_NO_OOB)) | |
374 | ver_offs += mtd->writesize; | |
375 | return ver_offs; | |
376 | } | |
377 | ||
1da177e4 LT |
378 | /** |
379 | * read_abs_bbts - [GENERIC] Read the bad block table(s) for all chips starting at a given page | |
8b6e50c9 BN |
380 | * @mtd: MTD device structure |
381 | * @buf: temporary buffer | |
382 | * @td: descriptor for the bad block table | |
383 | * @md: descriptor for the bad block table mirror | |
1da177e4 | 384 | * |
8b6e50c9 BN |
385 | * Read the bad block table(s) for all chips starting at a given page. We |
386 | * assume that the bbt bits are in consecutive order. | |
387 | */ | |
7b5a2d40 BN |
388 | static void read_abs_bbts(struct mtd_info *mtd, uint8_t *buf, |
389 | struct nand_bbt_descr *td, struct nand_bbt_descr *md) | |
1da177e4 | 390 | { |
862eba51 | 391 | struct nand_chip *this = mtd_to_nand(mtd); |
1da177e4 | 392 | |
61b03bd7 | 393 | /* Read the primary version, if available */ |
1da177e4 | 394 | if (td->options & NAND_BBT_VERSION) { |
af69dcd3 | 395 | scan_read(mtd, buf, (loff_t)td->pages[0] << this->page_shift, |
7cba7b14 SAS |
396 | mtd->writesize, td); |
397 | td->version[0] = buf[bbt_get_ver_offs(mtd, td)]; | |
9a4d4d69 | 398 | pr_info("Bad block table at page %d, version 0x%02X\n", |
d0370219 | 399 | td->pages[0], td->version[0]); |
1da177e4 LT |
400 | } |
401 | ||
61b03bd7 | 402 | /* Read the mirror version, if available */ |
1da177e4 | 403 | if (md && (md->options & NAND_BBT_VERSION)) { |
af69dcd3 | 404 | scan_read(mtd, buf, (loff_t)md->pages[0] << this->page_shift, |
7bb9c754 | 405 | mtd->writesize, md); |
7cba7b14 | 406 | md->version[0] = buf[bbt_get_ver_offs(mtd, md)]; |
9a4d4d69 | 407 | pr_info("Bad block table at page %d, version 0x%02X\n", |
d0370219 | 408 | md->pages[0], md->version[0]); |
1da177e4 | 409 | } |
1da177e4 LT |
410 | } |
411 | ||
8b6e50c9 | 412 | /* Scan a given block partially */ |
8593fbc6 | 413 | static int scan_block_fast(struct mtd_info *mtd, struct nand_bbt_descr *bd, |
eceb84b1 | 414 | loff_t offs, uint8_t *buf, int numpages) |
8593fbc6 TG |
415 | { |
416 | struct mtd_oob_ops ops; | |
417 | int j, ret; | |
418 | ||
8593fbc6 TG |
419 | ops.ooblen = mtd->oobsize; |
420 | ops.oobbuf = buf; | |
421 | ops.ooboffs = 0; | |
422 | ops.datbuf = NULL; | |
0612b9dd | 423 | ops.mode = MTD_OPS_PLACE_OOB; |
8593fbc6 | 424 | |
eceb84b1 | 425 | for (j = 0; j < numpages; j++) { |
8593fbc6 | 426 | /* |
8b6e50c9 BN |
427 | * Read the full oob until read_oob is fixed to handle single |
428 | * byte reads for 16 bit buswidth. | |
8593fbc6 | 429 | */ |
fd2819bb | 430 | ret = mtd_read_oob(mtd, offs, &ops); |
903cd06c | 431 | /* Ignore ECC errors when checking for BBM */ |
d57f4054 | 432 | if (ret && !mtd_is_bitflip_or_eccerr(ret)) |
8593fbc6 TG |
433 | return ret; |
434 | ||
435 | if (check_short_pattern(buf, bd)) | |
436 | return 1; | |
437 | ||
438 | offs += mtd->writesize; | |
439 | } | |
440 | return 0; | |
441 | } | |
442 | ||
1da177e4 LT |
443 | /** |
444 | * create_bbt - [GENERIC] Create a bad block table by scanning the device | |
8b6e50c9 BN |
445 | * @mtd: MTD device structure |
446 | * @buf: temporary buffer | |
447 | * @bd: descriptor for the good/bad block search pattern | |
448 | * @chip: create the table for a specific chip, -1 read all chips; applies only | |
449 | * if NAND_BBT_PERCHIP option is set | |
1da177e4 | 450 | * |
8b6e50c9 BN |
451 | * Create a bad block table by scanning the device for the given good/bad block |
452 | * identify pattern. | |
1da177e4 | 453 | */ |
8593fbc6 TG |
454 | static int create_bbt(struct mtd_info *mtd, uint8_t *buf, |
455 | struct nand_bbt_descr *bd, int chip) | |
1da177e4 | 456 | { |
862eba51 | 457 | struct nand_chip *this = mtd_to_nand(mtd); |
5961ad2c | 458 | int i, numblocks, numpages; |
1da177e4 LT |
459 | int startblock; |
460 | loff_t from; | |
1da177e4 | 461 | |
9a4d4d69 | 462 | pr_info("Scanning device for bad blocks\n"); |
1da177e4 | 463 | |
5961ad2c | 464 | if (bd->options & NAND_BBT_SCAN2NDPAGE) |
eceb84b1 | 465 | numpages = 2; |
58373ff0 | 466 | else |
eceb84b1 | 467 | numpages = 1; |
171650af | 468 | |
1da177e4 | 469 | if (chip == -1) { |
b4d20d60 | 470 | numblocks = mtd->size >> this->bbt_erase_shift; |
1da177e4 LT |
471 | startblock = 0; |
472 | from = 0; | |
473 | } else { | |
474 | if (chip >= this->numchips) { | |
9a4d4d69 | 475 | pr_warn("create_bbt(): chipnr (%d) > available chips (%d)\n", |
e0c7d767 | 476 | chip + 1, this->numchips); |
171650af | 477 | return -EINVAL; |
1da177e4 | 478 | } |
b4d20d60 | 479 | numblocks = this->chipsize >> this->bbt_erase_shift; |
1da177e4 LT |
480 | startblock = chip * numblocks; |
481 | numblocks += startblock; | |
b4d20d60 | 482 | from = (loff_t)startblock << this->bbt_erase_shift; |
1da177e4 | 483 | } |
61b03bd7 | 484 | |
5fb1549d | 485 | if (this->bbt_options & NAND_BBT_SCANLASTPAGE) |
eceb84b1 | 486 | from += mtd->erasesize - (mtd->writesize * numpages); |
b60b08b0 | 487 | |
b4d20d60 | 488 | for (i = startblock; i < numblocks; i++) { |
eeada24d | 489 | int ret; |
61b03bd7 | 490 | |
7cba7b14 SAS |
491 | BUG_ON(bd->options & NAND_BBT_NO_OOB); |
492 | ||
5961ad2c | 493 | ret = scan_block_fast(mtd, bd, from, buf, numpages); |
8593fbc6 TG |
494 | if (ret < 0) |
495 | return ret; | |
496 | ||
497 | if (ret) { | |
b4d20d60 | 498 | bbt_mark_entry(this, i, BBT_BLOCK_FACTORY_BAD); |
9a4d4d69 | 499 | pr_warn("Bad eraseblock %d at 0x%012llx\n", |
b4d20d60 | 500 | i, (unsigned long long)from); |
f1a28c02 | 501 | mtd->ecc_stats.badblocks++; |
1da177e4 | 502 | } |
8593fbc6 | 503 | |
1da177e4 LT |
504 | from += (1 << this->bbt_erase_shift); |
505 | } | |
eeada24d | 506 | return 0; |
1da177e4 LT |
507 | } |
508 | ||
509 | /** | |
510 | * search_bbt - [GENERIC] scan the device for a specific bad block table | |
8b6e50c9 BN |
511 | * @mtd: MTD device structure |
512 | * @buf: temporary buffer | |
513 | * @td: descriptor for the bad block table | |
1da177e4 | 514 | * |
8b6e50c9 BN |
515 | * Read the bad block table by searching for a given ident pattern. Search is |
516 | * preformed either from the beginning up or from the end of the device | |
517 | * downwards. The search starts always at the start of a block. If the option | |
518 | * NAND_BBT_PERCHIP is given, each chip is searched for a bbt, which contains | |
519 | * the bad block information of this chip. This is necessary to provide support | |
520 | * for certain DOC devices. | |
1da177e4 | 521 | * |
8b6e50c9 | 522 | * The bbt ident pattern resides in the oob area of the first page in a block. |
1da177e4 | 523 | */ |
e0c7d767 | 524 | static int search_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td) |
1da177e4 | 525 | { |
862eba51 | 526 | struct nand_chip *this = mtd_to_nand(mtd); |
1da177e4 | 527 | int i, chips; |
930de537 | 528 | int startblock, block, dir; |
28318776 | 529 | int scanlen = mtd->writesize + mtd->oobsize; |
1da177e4 | 530 | int bbtblocks; |
8593fbc6 | 531 | int blocktopage = this->bbt_erase_shift - this->page_shift; |
1da177e4 | 532 | |
8b6e50c9 | 533 | /* Search direction top -> down? */ |
1da177e4 | 534 | if (td->options & NAND_BBT_LASTBLOCK) { |
e0c7d767 | 535 | startblock = (mtd->size >> this->bbt_erase_shift) - 1; |
1da177e4 LT |
536 | dir = -1; |
537 | } else { | |
61b03bd7 | 538 | startblock = 0; |
1da177e4 | 539 | dir = 1; |
61b03bd7 TG |
540 | } |
541 | ||
8b6e50c9 | 542 | /* Do we have a bbt per chip? */ |
1da177e4 LT |
543 | if (td->options & NAND_BBT_PERCHIP) { |
544 | chips = this->numchips; | |
545 | bbtblocks = this->chipsize >> this->bbt_erase_shift; | |
546 | startblock &= bbtblocks - 1; | |
547 | } else { | |
548 | chips = 1; | |
549 | bbtblocks = mtd->size >> this->bbt_erase_shift; | |
550 | } | |
61b03bd7 | 551 | |
1da177e4 LT |
552 | for (i = 0; i < chips; i++) { |
553 | /* Reset version information */ | |
61b03bd7 | 554 | td->version[i] = 0; |
1da177e4 LT |
555 | td->pages[i] = -1; |
556 | /* Scan the maximum number of blocks */ | |
557 | for (block = 0; block < td->maxblocks; block++) { | |
8593fbc6 | 558 | |
1da177e4 | 559 | int actblock = startblock + dir * block; |
69423d99 | 560 | loff_t offs = (loff_t)actblock << this->bbt_erase_shift; |
8593fbc6 | 561 | |
1da177e4 | 562 | /* Read first page */ |
af69dcd3 | 563 | scan_read(mtd, buf, offs, mtd->writesize, td); |
28318776 | 564 | if (!check_pattern(buf, scanlen, mtd->writesize, td)) { |
8593fbc6 | 565 | td->pages[i] = actblock << blocktopage; |
1da177e4 | 566 | if (td->options & NAND_BBT_VERSION) { |
7cba7b14 SAS |
567 | offs = bbt_get_ver_offs(mtd, td); |
568 | td->version[i] = buf[offs]; | |
1da177e4 LT |
569 | } |
570 | break; | |
571 | } | |
572 | } | |
573 | startblock += this->chipsize >> this->bbt_erase_shift; | |
574 | } | |
575 | /* Check, if we found a bbt for each requested chip */ | |
576 | for (i = 0; i < chips; i++) { | |
577 | if (td->pages[i] == -1) | |
9a4d4d69 | 578 | pr_warn("Bad block table not found for chip %d\n", i); |
1da177e4 | 579 | else |
2ac63d90 RM |
580 | pr_info("Bad block table found at page %d, version 0x%02X\n", |
581 | td->pages[i], td->version[i]); | |
1da177e4 | 582 | } |
61b03bd7 | 583 | return 0; |
1da177e4 LT |
584 | } |
585 | ||
586 | /** | |
587 | * search_read_bbts - [GENERIC] scan the device for bad block table(s) | |
8b6e50c9 BN |
588 | * @mtd: MTD device structure |
589 | * @buf: temporary buffer | |
590 | * @td: descriptor for the bad block table | |
591 | * @md: descriptor for the bad block table mirror | |
1da177e4 | 592 | * |
8b6e50c9 BN |
593 | * Search and read the bad block table(s). |
594 | */ | |
7b5a2d40 BN |
595 | static void search_read_bbts(struct mtd_info *mtd, uint8_t *buf, |
596 | struct nand_bbt_descr *td, | |
597 | struct nand_bbt_descr *md) | |
1da177e4 LT |
598 | { |
599 | /* Search the primary table */ | |
e0c7d767 | 600 | search_bbt(mtd, buf, td); |
61b03bd7 | 601 | |
1da177e4 LT |
602 | /* Search the mirror table */ |
603 | if (md) | |
e0c7d767 | 604 | search_bbt(mtd, buf, md); |
1da177e4 | 605 | } |
1da177e4 | 606 | |
61b03bd7 | 607 | /** |
1da177e4 | 608 | * write_bbt - [GENERIC] (Re)write the bad block table |
8b6e50c9 BN |
609 | * @mtd: MTD device structure |
610 | * @buf: temporary buffer | |
611 | * @td: descriptor for the bad block table | |
612 | * @md: descriptor for the bad block table mirror | |
613 | * @chipsel: selector for a specific chip, -1 for all | |
1da177e4 | 614 | * |
8b6e50c9 BN |
615 | * (Re)write the bad block table. |
616 | */ | |
e0c7d767 | 617 | static int write_bbt(struct mtd_info *mtd, uint8_t *buf, |
9223a456 TG |
618 | struct nand_bbt_descr *td, struct nand_bbt_descr *md, |
619 | int chipsel) | |
1da177e4 | 620 | { |
862eba51 | 621 | struct nand_chip *this = mtd_to_nand(mtd); |
1da177e4 | 622 | struct erase_info einfo; |
b4d20d60 | 623 | int i, res, chip = 0; |
1da177e4 | 624 | int bits, startblock, dir, page, offs, numblocks, sft, sftmsk; |
b4d20d60 | 625 | int nrchips, pageoffs, ooboffs; |
1da177e4 LT |
626 | uint8_t msk[4]; |
627 | uint8_t rcode = td->reserved_block_code; | |
8593fbc6 | 628 | size_t retlen, len = 0; |
1da177e4 | 629 | loff_t to; |
8593fbc6 TG |
630 | struct mtd_oob_ops ops; |
631 | ||
632 | ops.ooblen = mtd->oobsize; | |
633 | ops.ooboffs = 0; | |
634 | ops.datbuf = NULL; | |
0612b9dd | 635 | ops.mode = MTD_OPS_PLACE_OOB; |
1da177e4 LT |
636 | |
637 | if (!rcode) | |
638 | rcode = 0xff; | |
8b6e50c9 | 639 | /* Write bad block table per chip rather than per device? */ |
1da177e4 | 640 | if (td->options & NAND_BBT_PERCHIP) { |
e0c7d767 | 641 | numblocks = (int)(this->chipsize >> this->bbt_erase_shift); |
8b6e50c9 | 642 | /* Full device write or specific chip? */ |
1da177e4 LT |
643 | if (chipsel == -1) { |
644 | nrchips = this->numchips; | |
645 | } else { | |
646 | nrchips = chipsel + 1; | |
647 | chip = chipsel; | |
648 | } | |
649 | } else { | |
e0c7d767 | 650 | numblocks = (int)(mtd->size >> this->bbt_erase_shift); |
1da177e4 | 651 | nrchips = 1; |
61b03bd7 TG |
652 | } |
653 | ||
1da177e4 LT |
654 | /* Loop through the chips */ |
655 | for (; chip < nrchips; chip++) { | |
8b6e50c9 BN |
656 | /* |
657 | * There was already a version of the table, reuse the page | |
61b03bd7 | 658 | * This applies for absolute placement too, as we have the |
1da177e4 LT |
659 | * page nr. in td->pages. |
660 | */ | |
661 | if (td->pages[chip] != -1) { | |
662 | page = td->pages[chip]; | |
663 | goto write; | |
61b03bd7 | 664 | } |
1da177e4 | 665 | |
8b6e50c9 BN |
666 | /* |
667 | * Automatic placement of the bad block table. Search direction | |
668 | * top -> down? | |
669 | */ | |
1da177e4 LT |
670 | if (td->options & NAND_BBT_LASTBLOCK) { |
671 | startblock = numblocks * (chip + 1) - 1; | |
672 | dir = -1; | |
673 | } else { | |
674 | startblock = chip * numblocks; | |
675 | dir = 1; | |
61b03bd7 | 676 | } |
1da177e4 LT |
677 | |
678 | for (i = 0; i < td->maxblocks; i++) { | |
679 | int block = startblock + dir * i; | |
680 | /* Check, if the block is bad */ | |
771c568b BN |
681 | switch (bbt_get_entry(this, block)) { |
682 | case BBT_BLOCK_WORN: | |
683 | case BBT_BLOCK_FACTORY_BAD: | |
1da177e4 LT |
684 | continue; |
685 | } | |
9223a456 TG |
686 | page = block << |
687 | (this->bbt_erase_shift - this->page_shift); | |
1da177e4 LT |
688 | /* Check, if the block is used by the mirror table */ |
689 | if (!md || md->pages[chip] != page) | |
690 | goto write; | |
691 | } | |
9a4d4d69 | 692 | pr_err("No space left to write bad block table\n"); |
1da177e4 | 693 | return -ENOSPC; |
e0c7d767 | 694 | write: |
1da177e4 LT |
695 | |
696 | /* Set up shift count and masks for the flash table */ | |
697 | bits = td->options & NAND_BBT_NRBITS_MSK; | |
9223a456 | 698 | msk[2] = ~rcode; |
1da177e4 | 699 | switch (bits) { |
9223a456 TG |
700 | case 1: sft = 3; sftmsk = 0x07; msk[0] = 0x00; msk[1] = 0x01; |
701 | msk[3] = 0x01; | |
702 | break; | |
703 | case 2: sft = 2; sftmsk = 0x06; msk[0] = 0x00; msk[1] = 0x01; | |
704 | msk[3] = 0x03; | |
705 | break; | |
706 | case 4: sft = 1; sftmsk = 0x04; msk[0] = 0x00; msk[1] = 0x0C; | |
707 | msk[3] = 0x0f; | |
708 | break; | |
709 | case 8: sft = 0; sftmsk = 0x00; msk[0] = 0x00; msk[1] = 0x0F; | |
710 | msk[3] = 0xff; | |
711 | break; | |
1da177e4 LT |
712 | default: return -EINVAL; |
713 | } | |
61b03bd7 | 714 | |
596d7452 | 715 | to = ((loff_t)page) << this->page_shift; |
1da177e4 | 716 | |
8b6e50c9 | 717 | /* Must we save the block contents? */ |
1da177e4 LT |
718 | if (td->options & NAND_BBT_SAVECONTENT) { |
719 | /* Make it block aligned */ | |
f5cd2ae1 | 720 | to &= ~(((loff_t)1 << this->bbt_erase_shift) - 1); |
1da177e4 | 721 | len = 1 << this->bbt_erase_shift; |
329ad399 | 722 | res = mtd_read(mtd, to, len, &retlen, buf); |
1da177e4 LT |
723 | if (res < 0) { |
724 | if (retlen != len) { | |
2ac63d90 | 725 | pr_info("nand_bbt: error reading block for writing the bad block table\n"); |
1da177e4 LT |
726 | return res; |
727 | } | |
2ac63d90 | 728 | pr_warn("nand_bbt: ECC error while reading block for writing bad block table\n"); |
1da177e4 | 729 | } |
9223a456 | 730 | /* Read oob data */ |
7014568b | 731 | ops.ooblen = (len >> this->page_shift) * mtd->oobsize; |
8593fbc6 | 732 | ops.oobbuf = &buf[len]; |
fd2819bb | 733 | res = mtd_read_oob(mtd, to + mtd->writesize, &ops); |
7014568b | 734 | if (res < 0 || ops.oobretlen != ops.ooblen) |
9223a456 TG |
735 | goto outerr; |
736 | ||
1da177e4 LT |
737 | /* Calc the byte offset in the buffer */ |
738 | pageoffs = page - (int)(to >> this->page_shift); | |
739 | offs = pageoffs << this->page_shift; | |
740 | /* Preset the bbt area with 0xff */ | |
596d7452 | 741 | memset(&buf[offs], 0xff, (size_t)(numblocks >> sft)); |
9223a456 TG |
742 | ooboffs = len + (pageoffs * mtd->oobsize); |
743 | ||
7cba7b14 SAS |
744 | } else if (td->options & NAND_BBT_NO_OOB) { |
745 | ooboffs = 0; | |
746 | offs = td->len; | |
8b6e50c9 | 747 | /* The version byte */ |
7cba7b14 SAS |
748 | if (td->options & NAND_BBT_VERSION) |
749 | offs++; | |
750 | /* Calc length */ | |
596d7452 | 751 | len = (size_t)(numblocks >> sft); |
7cba7b14 | 752 | len += offs; |
8b6e50c9 | 753 | /* Make it page aligned! */ |
7cba7b14 SAS |
754 | len = ALIGN(len, mtd->writesize); |
755 | /* Preset the buffer with 0xff */ | |
756 | memset(buf, 0xff, len); | |
757 | /* Pattern is located at the begin of first page */ | |
758 | memcpy(buf, td->pattern, td->len); | |
1da177e4 LT |
759 | } else { |
760 | /* Calc length */ | |
596d7452 | 761 | len = (size_t)(numblocks >> sft); |
8b6e50c9 | 762 | /* Make it page aligned! */ |
cda32091 | 763 | len = ALIGN(len, mtd->writesize); |
1da177e4 | 764 | /* Preset the buffer with 0xff */ |
9223a456 TG |
765 | memset(buf, 0xff, len + |
766 | (len >> this->page_shift)* mtd->oobsize); | |
1da177e4 | 767 | offs = 0; |
9223a456 | 768 | ooboffs = len; |
1da177e4 | 769 | /* Pattern is located in oob area of first page */ |
9223a456 | 770 | memcpy(&buf[ooboffs + td->offs], td->pattern, td->len); |
1da177e4 | 771 | } |
61b03bd7 | 772 | |
9223a456 TG |
773 | if (td->options & NAND_BBT_VERSION) |
774 | buf[ooboffs + td->veroffs] = td->version[chip]; | |
775 | ||
8b6e50c9 | 776 | /* Walk through the memory table */ |
b4d20d60 | 777 | for (i = 0; i < numblocks; i++) { |
1da177e4 | 778 | uint8_t dat; |
b4d20d60 BN |
779 | int sftcnt = (i << (3 - sft)) & sftmsk; |
780 | dat = bbt_get_entry(this, chip * numblocks + i); | |
781 | /* Do not store the reserved bbt blocks! */ | |
782 | buf[offs + (i >> sft)] &= ~(msk[dat] << sftcnt); | |
1da177e4 | 783 | } |
61b03bd7 | 784 | |
e0c7d767 | 785 | memset(&einfo, 0, sizeof(einfo)); |
1da177e4 | 786 | einfo.mtd = mtd; |
69423d99 | 787 | einfo.addr = to; |
1da177e4 | 788 | einfo.len = 1 << this->bbt_erase_shift; |
e0c7d767 | 789 | res = nand_erase_nand(mtd, &einfo, 1); |
9223a456 TG |
790 | if (res < 0) |
791 | goto outerr; | |
61b03bd7 | 792 | |
7cba7b14 SAS |
793 | res = scan_write_bbt(mtd, to, len, buf, |
794 | td->options & NAND_BBT_NO_OOB ? NULL : | |
795 | &buf[len]); | |
9223a456 TG |
796 | if (res < 0) |
797 | goto outerr; | |
798 | ||
d0370219 BN |
799 | pr_info("Bad block table written to 0x%012llx, version 0x%02X\n", |
800 | (unsigned long long)to, td->version[chip]); | |
61b03bd7 | 801 | |
1da177e4 LT |
802 | /* Mark it as used */ |
803 | td->pages[chip] = page; | |
61b03bd7 | 804 | } |
1da177e4 | 805 | return 0; |
9223a456 TG |
806 | |
807 | outerr: | |
d0370219 | 808 | pr_warn("nand_bbt: error while writing bad block table %d\n", res); |
9223a456 | 809 | return res; |
1da177e4 LT |
810 | } |
811 | ||
812 | /** | |
813 | * nand_memory_bbt - [GENERIC] create a memory based bad block table | |
8b6e50c9 BN |
814 | * @mtd: MTD device structure |
815 | * @bd: descriptor for the good/bad block search pattern | |
1da177e4 | 816 | * |
8b6e50c9 BN |
817 | * The function creates a memory based bbt by scanning the device for |
818 | * manufacturer / software marked good / bad blocks. | |
819 | */ | |
e0c7d767 | 820 | static inline int nand_memory_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd) |
1da177e4 | 821 | { |
862eba51 | 822 | struct nand_chip *this = mtd_to_nand(mtd); |
1da177e4 | 823 | |
4bf63fcb | 824 | return create_bbt(mtd, this->buffers->databuf, bd, -1); |
1da177e4 LT |
825 | } |
826 | ||
827 | /** | |
e0c7d767 | 828 | * check_create - [GENERIC] create and write bbt(s) if necessary |
8b6e50c9 BN |
829 | * @mtd: MTD device structure |
830 | * @buf: temporary buffer | |
831 | * @bd: descriptor for the good/bad block search pattern | |
1da177e4 | 832 | * |
8b6e50c9 BN |
833 | * The function checks the results of the previous call to read_bbt and creates |
834 | * / updates the bbt(s) if necessary. Creation is necessary if no bbt was found | |
835 | * for the chip/device. Update is necessary if one of the tables is missing or | |
836 | * the version nr. of one table is less than the other. | |
837 | */ | |
e0c7d767 | 838 | static int check_create(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *bd) |
1da177e4 | 839 | { |
623978de | 840 | int i, chips, writeops, create, chipsel, res, res2; |
862eba51 | 841 | struct nand_chip *this = mtd_to_nand(mtd); |
1da177e4 LT |
842 | struct nand_bbt_descr *td = this->bbt_td; |
843 | struct nand_bbt_descr *md = this->bbt_md; | |
844 | struct nand_bbt_descr *rd, *rd2; | |
845 | ||
8b6e50c9 | 846 | /* Do we have a bbt per chip? */ |
61b03bd7 | 847 | if (td->options & NAND_BBT_PERCHIP) |
1da177e4 | 848 | chips = this->numchips; |
61b03bd7 | 849 | else |
1da177e4 | 850 | chips = 1; |
61b03bd7 | 851 | |
1da177e4 LT |
852 | for (i = 0; i < chips; i++) { |
853 | writeops = 0; | |
b61bf5bb | 854 | create = 0; |
1da177e4 LT |
855 | rd = NULL; |
856 | rd2 = NULL; | |
623978de | 857 | res = res2 = 0; |
8b6e50c9 | 858 | /* Per chip or per device? */ |
1da177e4 | 859 | chipsel = (td->options & NAND_BBT_PERCHIP) ? i : -1; |
8b6e50c9 | 860 | /* Mirrored table available? */ |
1da177e4 LT |
861 | if (md) { |
862 | if (td->pages[i] == -1 && md->pages[i] == -1) { | |
b61bf5bb | 863 | create = 1; |
1da177e4 | 864 | writeops = 0x03; |
c5e8ef9c | 865 | } else if (td->pages[i] == -1) { |
61b03bd7 | 866 | rd = md; |
596d7452 | 867 | writeops = 0x01; |
c5e8ef9c | 868 | } else if (md->pages[i] == -1) { |
1da177e4 | 869 | rd = td; |
596d7452 | 870 | writeops = 0x02; |
c5e8ef9c | 871 | } else if (td->version[i] == md->version[i]) { |
1da177e4 LT |
872 | rd = td; |
873 | if (!(td->options & NAND_BBT_VERSION)) | |
874 | rd2 = md; | |
c5e8ef9c | 875 | } else if (((int8_t)(td->version[i] - md->version[i])) > 0) { |
1da177e4 | 876 | rd = td; |
596d7452 | 877 | writeops = 0x02; |
1da177e4 LT |
878 | } else { |
879 | rd = md; | |
596d7452 | 880 | writeops = 0x01; |
1da177e4 | 881 | } |
1da177e4 LT |
882 | } else { |
883 | if (td->pages[i] == -1) { | |
b61bf5bb | 884 | create = 1; |
1da177e4 | 885 | writeops = 0x01; |
b61bf5bb BN |
886 | } else { |
887 | rd = td; | |
1da177e4 | 888 | } |
1da177e4 | 889 | } |
61b03bd7 | 890 | |
b61bf5bb BN |
891 | if (create) { |
892 | /* Create the bad block table by scanning the device? */ | |
893 | if (!(td->options & NAND_BBT_CREATE)) | |
894 | continue; | |
895 | ||
896 | /* Create the table in memory by scanning the chip(s) */ | |
897 | if (!(this->bbt_options & NAND_BBT_CREATE_EMPTY)) | |
898 | create_bbt(mtd, buf, bd, chipsel); | |
899 | ||
900 | td->version[i] = 1; | |
901 | if (md) | |
902 | md->version[i] = 1; | |
903 | } | |
904 | ||
8b6e50c9 | 905 | /* Read back first? */ |
623978de BN |
906 | if (rd) { |
907 | res = read_abs_bbt(mtd, buf, rd, chipsel); | |
908 | if (mtd_is_eccerr(res)) { | |
909 | /* Mark table as invalid */ | |
910 | rd->pages[i] = -1; | |
dadc17a3 | 911 | rd->version[i] = 0; |
623978de BN |
912 | i--; |
913 | continue; | |
914 | } | |
915 | } | |
8b6e50c9 | 916 | /* If they weren't versioned, read both */ |
623978de BN |
917 | if (rd2) { |
918 | res2 = read_abs_bbt(mtd, buf, rd2, chipsel); | |
919 | if (mtd_is_eccerr(res2)) { | |
920 | /* Mark table as invalid */ | |
921 | rd2->pages[i] = -1; | |
dadc17a3 | 922 | rd2->version[i] = 0; |
623978de BN |
923 | i--; |
924 | continue; | |
925 | } | |
926 | } | |
927 | ||
928 | /* Scrub the flash table(s)? */ | |
929 | if (mtd_is_bitflip(res) || mtd_is_bitflip(res2)) | |
930 | writeops = 0x03; | |
1da177e4 | 931 | |
dadc17a3 BN |
932 | /* Update version numbers before writing */ |
933 | if (md) { | |
934 | td->version[i] = max(td->version[i], md->version[i]); | |
935 | md->version[i] = td->version[i]; | |
936 | } | |
937 | ||
8b6e50c9 | 938 | /* Write the bad block table to the device? */ |
1da177e4 | 939 | if ((writeops & 0x01) && (td->options & NAND_BBT_WRITE)) { |
e0c7d767 | 940 | res = write_bbt(mtd, buf, td, md, chipsel); |
1da177e4 LT |
941 | if (res < 0) |
942 | return res; | |
943 | } | |
61b03bd7 | 944 | |
8b6e50c9 | 945 | /* Write the mirror bad block table to the device? */ |
1da177e4 | 946 | if ((writeops & 0x02) && md && (md->options & NAND_BBT_WRITE)) { |
e0c7d767 | 947 | res = write_bbt(mtd, buf, md, td, chipsel); |
1da177e4 LT |
948 | if (res < 0) |
949 | return res; | |
950 | } | |
951 | } | |
61b03bd7 | 952 | return 0; |
1da177e4 LT |
953 | } |
954 | ||
955 | /** | |
61b03bd7 | 956 | * mark_bbt_regions - [GENERIC] mark the bad block table regions |
8b6e50c9 BN |
957 | * @mtd: MTD device structure |
958 | * @td: bad block table descriptor | |
1da177e4 | 959 | * |
8b6e50c9 BN |
960 | * The bad block table regions are marked as "bad" to prevent accidental |
961 | * erasures / writes. The regions are identified by the mark 0x02. | |
962 | */ | |
e0c7d767 | 963 | static void mark_bbt_region(struct mtd_info *mtd, struct nand_bbt_descr *td) |
1da177e4 | 964 | { |
862eba51 | 965 | struct nand_chip *this = mtd_to_nand(mtd); |
1da177e4 | 966 | int i, j, chips, block, nrblocks, update; |
771c568b | 967 | uint8_t oldval; |
1da177e4 | 968 | |
8b6e50c9 | 969 | /* Do we have a bbt per chip? */ |
1da177e4 LT |
970 | if (td->options & NAND_BBT_PERCHIP) { |
971 | chips = this->numchips; | |
972 | nrblocks = (int)(this->chipsize >> this->bbt_erase_shift); | |
973 | } else { | |
974 | chips = 1; | |
975 | nrblocks = (int)(mtd->size >> this->bbt_erase_shift); | |
61b03bd7 TG |
976 | } |
977 | ||
1da177e4 LT |
978 | for (i = 0; i < chips; i++) { |
979 | if ((td->options & NAND_BBT_ABSPAGE) || | |
980 | !(td->options & NAND_BBT_WRITE)) { | |
e0c7d767 DW |
981 | if (td->pages[i] == -1) |
982 | continue; | |
1da177e4 | 983 | block = td->pages[i] >> (this->bbt_erase_shift - this->page_shift); |
b4d20d60 BN |
984 | oldval = bbt_get_entry(this, block); |
985 | bbt_mark_entry(this, block, BBT_BLOCK_RESERVED); | |
771c568b BN |
986 | if ((oldval != BBT_BLOCK_RESERVED) && |
987 | td->reserved_block_code) | |
b4d20d60 BN |
988 | nand_update_bbt(mtd, (loff_t)block << |
989 | this->bbt_erase_shift); | |
1da177e4 LT |
990 | continue; |
991 | } | |
992 | update = 0; | |
993 | if (td->options & NAND_BBT_LASTBLOCK) | |
994 | block = ((i + 1) * nrblocks) - td->maxblocks; | |
61b03bd7 | 995 | else |
1da177e4 | 996 | block = i * nrblocks; |
1da177e4 | 997 | for (j = 0; j < td->maxblocks; j++) { |
b4d20d60 BN |
998 | oldval = bbt_get_entry(this, block); |
999 | bbt_mark_entry(this, block, BBT_BLOCK_RESERVED); | |
771c568b | 1000 | if (oldval != BBT_BLOCK_RESERVED) |
e0c7d767 | 1001 | update = 1; |
b4d20d60 | 1002 | block++; |
61b03bd7 | 1003 | } |
8b6e50c9 BN |
1004 | /* |
1005 | * If we want reserved blocks to be recorded to flash, and some | |
1006 | * new ones have been marked, then we need to update the stored | |
1007 | * bbts. This should only happen once. | |
1008 | */ | |
1da177e4 | 1009 | if (update && td->reserved_block_code) |
b4d20d60 BN |
1010 | nand_update_bbt(mtd, (loff_t)(block - 1) << |
1011 | this->bbt_erase_shift); | |
1da177e4 LT |
1012 | } |
1013 | } | |
1014 | ||
7cba7b14 SAS |
1015 | /** |
1016 | * verify_bbt_descr - verify the bad block description | |
8b6e50c9 BN |
1017 | * @mtd: MTD device structure |
1018 | * @bd: the table to verify | |
7cba7b14 SAS |
1019 | * |
1020 | * This functions performs a few sanity checks on the bad block description | |
1021 | * table. | |
1022 | */ | |
1023 | static void verify_bbt_descr(struct mtd_info *mtd, struct nand_bbt_descr *bd) | |
1024 | { | |
862eba51 | 1025 | struct nand_chip *this = mtd_to_nand(mtd); |
7912a5e7 SF |
1026 | u32 pattern_len; |
1027 | u32 bits; | |
7cba7b14 SAS |
1028 | u32 table_size; |
1029 | ||
1030 | if (!bd) | |
1031 | return; | |
7912a5e7 SF |
1032 | |
1033 | pattern_len = bd->len; | |
1034 | bits = bd->options & NAND_BBT_NRBITS_MSK; | |
1035 | ||
a40f7341 | 1036 | BUG_ON((this->bbt_options & NAND_BBT_NO_OOB) && |
bb9ebd4e | 1037 | !(this->bbt_options & NAND_BBT_USE_FLASH)); |
7cba7b14 SAS |
1038 | BUG_ON(!bits); |
1039 | ||
1040 | if (bd->options & NAND_BBT_VERSION) | |
1041 | pattern_len++; | |
1042 | ||
1043 | if (bd->options & NAND_BBT_NO_OOB) { | |
bb9ebd4e | 1044 | BUG_ON(!(this->bbt_options & NAND_BBT_USE_FLASH)); |
a40f7341 | 1045 | BUG_ON(!(this->bbt_options & NAND_BBT_NO_OOB)); |
7cba7b14 SAS |
1046 | BUG_ON(bd->offs); |
1047 | if (bd->options & NAND_BBT_VERSION) | |
1048 | BUG_ON(bd->veroffs != bd->len); | |
1049 | BUG_ON(bd->options & NAND_BBT_SAVECONTENT); | |
1050 | } | |
1051 | ||
1052 | if (bd->options & NAND_BBT_PERCHIP) | |
1053 | table_size = this->chipsize >> this->bbt_erase_shift; | |
1054 | else | |
1055 | table_size = mtd->size >> this->bbt_erase_shift; | |
1056 | table_size >>= 3; | |
1057 | table_size *= bits; | |
1058 | if (bd->options & NAND_BBT_NO_OOB) | |
1059 | table_size += pattern_len; | |
1060 | BUG_ON(table_size > (1 << this->bbt_erase_shift)); | |
1061 | } | |
1062 | ||
1da177e4 LT |
1063 | /** |
1064 | * nand_scan_bbt - [NAND Interface] scan, find, read and maybe create bad block table(s) | |
8b6e50c9 BN |
1065 | * @mtd: MTD device structure |
1066 | * @bd: descriptor for the good/bad block search pattern | |
1da177e4 | 1067 | * |
8b6e50c9 BN |
1068 | * The function checks, if a bad block table(s) is/are already available. If |
1069 | * not it scans the device for manufacturer marked good / bad blocks and writes | |
1070 | * the bad block table(s) to the selected place. | |
1da177e4 | 1071 | * |
8b6e50c9 BN |
1072 | * The bad block table memory is allocated here. It must be freed by calling |
1073 | * the nand_free_bbt function. | |
1074 | */ | |
17799359 | 1075 | static int nand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd) |
1da177e4 | 1076 | { |
862eba51 | 1077 | struct nand_chip *this = mtd_to_nand(mtd); |
83c59542 | 1078 | int len, res; |
1da177e4 LT |
1079 | uint8_t *buf; |
1080 | struct nand_bbt_descr *td = this->bbt_td; | |
1081 | struct nand_bbt_descr *md = this->bbt_md; | |
1082 | ||
192db1ca | 1083 | len = (mtd->size >> (this->bbt_erase_shift + 2)) ? : 1; |
8b6e50c9 BN |
1084 | /* |
1085 | * Allocate memory (2bit per block) and clear the memory bad block | |
1086 | * table. | |
1087 | */ | |
95b93a0c | 1088 | this->bbt = kzalloc(len, GFP_KERNEL); |
0870066d | 1089 | if (!this->bbt) |
1da177e4 | 1090 | return -ENOMEM; |
1da177e4 | 1091 | |
8b6e50c9 BN |
1092 | /* |
1093 | * If no primary table decriptor is given, scan the device to build a | |
1094 | * memory based bad block table. | |
1da177e4 | 1095 | */ |
eeada24d AB |
1096 | if (!td) { |
1097 | if ((res = nand_memory_bbt(mtd, bd))) { | |
d0370219 | 1098 | pr_err("nand_bbt: can't scan flash and build the RAM-based BBT\n"); |
83c59542 | 1099 | goto err; |
eeada24d | 1100 | } |
83c59542 | 1101 | return 0; |
eeada24d | 1102 | } |
7cba7b14 SAS |
1103 | verify_bbt_descr(mtd, td); |
1104 | verify_bbt_descr(mtd, md); | |
1da177e4 LT |
1105 | |
1106 | /* Allocate a temporary buffer for one eraseblock incl. oob */ | |
1107 | len = (1 << this->bbt_erase_shift); | |
1108 | len += (len >> this->page_shift) * mtd->oobsize; | |
c3f8abf4 | 1109 | buf = vmalloc(len); |
1da177e4 | 1110 | if (!buf) { |
83c59542 BN |
1111 | res = -ENOMEM; |
1112 | goto err; | |
1da177e4 | 1113 | } |
61b03bd7 | 1114 | |
8b6e50c9 | 1115 | /* Is the bbt at a given page? */ |
1da177e4 | 1116 | if (td->options & NAND_BBT_ABSPAGE) { |
7b5a2d40 | 1117 | read_abs_bbts(mtd, buf, td, md); |
61b03bd7 | 1118 | } else { |
1da177e4 | 1119 | /* Search the bad block table using a pattern in oob */ |
7b5a2d40 | 1120 | search_read_bbts(mtd, buf, td, md); |
61b03bd7 | 1121 | } |
1da177e4 | 1122 | |
7b5a2d40 | 1123 | res = check_create(mtd, buf, bd); |
83c59542 BN |
1124 | if (res) |
1125 | goto err; | |
61b03bd7 | 1126 | |
1da177e4 | 1127 | /* Prevent the bbt regions from erasing / writing */ |
e0c7d767 | 1128 | mark_bbt_region(mtd, td); |
1da177e4 | 1129 | if (md) |
e0c7d767 | 1130 | mark_bbt_region(mtd, md); |
61b03bd7 | 1131 | |
e0c7d767 | 1132 | vfree(buf); |
83c59542 BN |
1133 | return 0; |
1134 | ||
1135 | err: | |
1136 | kfree(this->bbt); | |
1137 | this->bbt = NULL; | |
1da177e4 LT |
1138 | return res; |
1139 | } | |
1140 | ||
1da177e4 | 1141 | /** |
b32843b7 | 1142 | * nand_update_bbt - update bad block table(s) |
8b6e50c9 BN |
1143 | * @mtd: MTD device structure |
1144 | * @offs: the offset of the newly marked block | |
1da177e4 | 1145 | * |
8b6e50c9 BN |
1146 | * The function updates the bad block table(s). |
1147 | */ | |
b32843b7 | 1148 | static int nand_update_bbt(struct mtd_info *mtd, loff_t offs) |
1da177e4 | 1149 | { |
862eba51 | 1150 | struct nand_chip *this = mtd_to_nand(mtd); |
1196ac5a | 1151 | int len, res = 0; |
1da177e4 LT |
1152 | int chip, chipsel; |
1153 | uint8_t *buf; | |
1154 | struct nand_bbt_descr *td = this->bbt_td; | |
1155 | struct nand_bbt_descr *md = this->bbt_md; | |
1156 | ||
1157 | if (!this->bbt || !td) | |
1158 | return -EINVAL; | |
1159 | ||
1da177e4 LT |
1160 | /* Allocate a temporary buffer for one eraseblock incl. oob */ |
1161 | len = (1 << this->bbt_erase_shift); | |
1162 | len += (len >> this->page_shift) * mtd->oobsize; | |
e0c7d767 | 1163 | buf = kmalloc(len, GFP_KERNEL); |
0870066d | 1164 | if (!buf) |
1da177e4 | 1165 | return -ENOMEM; |
1da177e4 | 1166 | |
8b6e50c9 | 1167 | /* Do we have a bbt per chip? */ |
1da177e4 | 1168 | if (td->options & NAND_BBT_PERCHIP) { |
e0c7d767 | 1169 | chip = (int)(offs >> this->chip_shift); |
1da177e4 LT |
1170 | chipsel = chip; |
1171 | } else { | |
1172 | chip = 0; | |
1173 | chipsel = -1; | |
1174 | } | |
1175 | ||
1176 | td->version[chip]++; | |
1177 | if (md) | |
61b03bd7 | 1178 | md->version[chip]++; |
1da177e4 | 1179 | |
8b6e50c9 | 1180 | /* Write the bad block table to the device? */ |
1196ac5a | 1181 | if (td->options & NAND_BBT_WRITE) { |
e0c7d767 | 1182 | res = write_bbt(mtd, buf, td, md, chipsel); |
1da177e4 LT |
1183 | if (res < 0) |
1184 | goto out; | |
1185 | } | |
8b6e50c9 | 1186 | /* Write the mirror bad block table to the device? */ |
1196ac5a | 1187 | if (md && (md->options & NAND_BBT_WRITE)) { |
e0c7d767 | 1188 | res = write_bbt(mtd, buf, md, td, chipsel); |
1da177e4 LT |
1189 | } |
1190 | ||
e0c7d767 DW |
1191 | out: |
1192 | kfree(buf); | |
1da177e4 LT |
1193 | return res; |
1194 | } | |
1195 | ||
8b6e50c9 BN |
1196 | /* |
1197 | * Define some generic bad / good block scan pattern which are used | |
1198 | * while scanning a device for factory marked good / bad blocks. | |
1199 | */ | |
1da177e4 LT |
1200 | static uint8_t scan_ff_pattern[] = { 0xff, 0xff }; |
1201 | ||
7854d3f7 | 1202 | /* Generic flash bbt descriptors */ |
1da177e4 LT |
1203 | static uint8_t bbt_pattern[] = {'B', 'b', 't', '0' }; |
1204 | static uint8_t mirror_pattern[] = {'1', 't', 'b', 'B' }; | |
1205 | ||
1206 | static struct nand_bbt_descr bbt_main_descr = { | |
61b03bd7 | 1207 | .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
1da177e4 LT |
1208 | | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP, |
1209 | .offs = 8, | |
1210 | .len = 4, | |
1211 | .veroffs = 12, | |
61de9da6 | 1212 | .maxblocks = NAND_BBT_SCAN_MAXBLOCKS, |
1da177e4 LT |
1213 | .pattern = bbt_pattern |
1214 | }; | |
1215 | ||
1216 | static struct nand_bbt_descr bbt_mirror_descr = { | |
61b03bd7 | 1217 | .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
1da177e4 LT |
1218 | | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP, |
1219 | .offs = 8, | |
1220 | .len = 4, | |
1221 | .veroffs = 12, | |
61de9da6 | 1222 | .maxblocks = NAND_BBT_SCAN_MAXBLOCKS, |
1da177e4 LT |
1223 | .pattern = mirror_pattern |
1224 | }; | |
1225 | ||
9fd6b37a | 1226 | static struct nand_bbt_descr bbt_main_no_oob_descr = { |
7cba7b14 SAS |
1227 | .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
1228 | | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP | |
1229 | | NAND_BBT_NO_OOB, | |
1230 | .len = 4, | |
1231 | .veroffs = 4, | |
61de9da6 | 1232 | .maxblocks = NAND_BBT_SCAN_MAXBLOCKS, |
7cba7b14 SAS |
1233 | .pattern = bbt_pattern |
1234 | }; | |
1235 | ||
9fd6b37a | 1236 | static struct nand_bbt_descr bbt_mirror_no_oob_descr = { |
7cba7b14 SAS |
1237 | .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
1238 | | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP | |
1239 | | NAND_BBT_NO_OOB, | |
1240 | .len = 4, | |
1241 | .veroffs = 4, | |
61de9da6 | 1242 | .maxblocks = NAND_BBT_SCAN_MAXBLOCKS, |
7cba7b14 SAS |
1243 | .pattern = mirror_pattern |
1244 | }; | |
1245 | ||
752ed6c5 | 1246 | #define BADBLOCK_SCAN_MASK (~NAND_BBT_NO_OOB) |
58373ff0 | 1247 | /** |
752ed6c5 | 1248 | * nand_create_badblock_pattern - [INTERN] Creates a BBT descriptor structure |
8b6e50c9 | 1249 | * @this: NAND chip to create descriptor for |
58373ff0 BN |
1250 | * |
1251 | * This function allocates and initializes a nand_bbt_descr for BBM detection | |
752ed6c5 | 1252 | * based on the properties of @this. The new descriptor is stored in |
58373ff0 BN |
1253 | * this->badblock_pattern. Thus, this->badblock_pattern should be NULL when |
1254 | * passed to this function. | |
58373ff0 | 1255 | */ |
752ed6c5 | 1256 | static int nand_create_badblock_pattern(struct nand_chip *this) |
58373ff0 BN |
1257 | { |
1258 | struct nand_bbt_descr *bd; | |
1259 | if (this->badblock_pattern) { | |
752ed6c5 | 1260 | pr_warn("Bad block pattern already allocated; not replacing\n"); |
58373ff0 BN |
1261 | return -EINVAL; |
1262 | } | |
1263 | bd = kzalloc(sizeof(*bd), GFP_KERNEL); | |
0870066d | 1264 | if (!bd) |
58373ff0 | 1265 | return -ENOMEM; |
752ed6c5 | 1266 | bd->options = this->bbt_options & BADBLOCK_SCAN_MASK; |
58373ff0 BN |
1267 | bd->offs = this->badblockpos; |
1268 | bd->len = (this->options & NAND_BUSWIDTH_16) ? 2 : 1; | |
1269 | bd->pattern = scan_ff_pattern; | |
1270 | bd->options |= NAND_BBT_DYNAMICSTRUCT; | |
1271 | this->badblock_pattern = bd; | |
1272 | return 0; | |
1273 | } | |
1274 | ||
1da177e4 | 1275 | /** |
61b03bd7 | 1276 | * nand_default_bbt - [NAND Interface] Select a default bad block table for the device |
8b6e50c9 | 1277 | * @mtd: MTD device structure |
1da177e4 | 1278 | * |
8b6e50c9 BN |
1279 | * This function selects the default bad block table support for the device and |
1280 | * calls the nand_scan_bbt function. | |
1281 | */ | |
e0c7d767 | 1282 | int nand_default_bbt(struct mtd_info *mtd) |
1da177e4 | 1283 | { |
862eba51 | 1284 | struct nand_chip *this = mtd_to_nand(mtd); |
abb9cf78 | 1285 | int ret; |
61b03bd7 | 1286 | |
8b6e50c9 | 1287 | /* Is a flash based bad block table requested? */ |
bb9ebd4e | 1288 | if (this->bbt_options & NAND_BBT_USE_FLASH) { |
61b03bd7 TG |
1289 | /* Use the default pattern descriptors */ |
1290 | if (!this->bbt_td) { | |
a40f7341 | 1291 | if (this->bbt_options & NAND_BBT_NO_OOB) { |
9fd6b37a BN |
1292 | this->bbt_td = &bbt_main_no_oob_descr; |
1293 | this->bbt_md = &bbt_mirror_no_oob_descr; | |
7cba7b14 SAS |
1294 | } else { |
1295 | this->bbt_td = &bbt_main_descr; | |
1296 | this->bbt_md = &bbt_mirror_descr; | |
1297 | } | |
1da177e4 | 1298 | } |
1da177e4 LT |
1299 | } else { |
1300 | this->bbt_td = NULL; | |
1301 | this->bbt_md = NULL; | |
1da177e4 | 1302 | } |
a2f812df | 1303 | |
abb9cf78 BN |
1304 | if (!this->badblock_pattern) { |
1305 | ret = nand_create_badblock_pattern(this); | |
1306 | if (ret) | |
1307 | return ret; | |
1308 | } | |
a2f812df | 1309 | |
e0c7d767 | 1310 | return nand_scan_bbt(mtd, this->badblock_pattern); |
1da177e4 LT |
1311 | } |
1312 | ||
8471bb73 EG |
1313 | /** |
1314 | * nand_isreserved_bbt - [NAND Interface] Check if a block is reserved | |
1315 | * @mtd: MTD device structure | |
1316 | * @offs: offset in the device | |
1317 | */ | |
1318 | int nand_isreserved_bbt(struct mtd_info *mtd, loff_t offs) | |
1319 | { | |
862eba51 | 1320 | struct nand_chip *this = mtd_to_nand(mtd); |
8471bb73 EG |
1321 | int block; |
1322 | ||
1323 | block = (int)(offs >> this->bbt_erase_shift); | |
1324 | return bbt_get_entry(this, block) == BBT_BLOCK_RESERVED; | |
1325 | } | |
1326 | ||
1da177e4 | 1327 | /** |
61b03bd7 | 1328 | * nand_isbad_bbt - [NAND Interface] Check if a block is bad |
8b6e50c9 BN |
1329 | * @mtd: MTD device structure |
1330 | * @offs: offset in the device | |
1331 | * @allowbbt: allow access to bad block table region | |
1332 | */ | |
e0c7d767 | 1333 | int nand_isbad_bbt(struct mtd_info *mtd, loff_t offs, int allowbbt) |
1da177e4 | 1334 | { |
862eba51 | 1335 | struct nand_chip *this = mtd_to_nand(mtd); |
39dbb029 | 1336 | int block, res; |
61b03bd7 | 1337 | |
b4d20d60 BN |
1338 | block = (int)(offs >> this->bbt_erase_shift); |
1339 | res = bbt_get_entry(this, block); | |
1da177e4 | 1340 | |
2ac63d90 RM |
1341 | pr_debug("nand_isbad_bbt(): bbt info for offs 0x%08x: (block %d) 0x%02x\n", |
1342 | (unsigned int)offs, block, res); | |
1da177e4 | 1343 | |
39dbb029 | 1344 | switch (res) { |
771c568b | 1345 | case BBT_BLOCK_GOOD: |
e0c7d767 | 1346 | return 0; |
771c568b | 1347 | case BBT_BLOCK_WORN: |
e0c7d767 | 1348 | return 1; |
771c568b | 1349 | case BBT_BLOCK_RESERVED: |
e0c7d767 | 1350 | return allowbbt ? 0 : 1; |
1da177e4 LT |
1351 | } |
1352 | return 1; | |
1353 | } | |
1354 | ||
b32843b7 BN |
1355 | /** |
1356 | * nand_markbad_bbt - [NAND Interface] Mark a block bad in the BBT | |
1357 | * @mtd: MTD device structure | |
1358 | * @offs: offset of the bad block | |
1359 | */ | |
1360 | int nand_markbad_bbt(struct mtd_info *mtd, loff_t offs) | |
1361 | { | |
862eba51 | 1362 | struct nand_chip *this = mtd_to_nand(mtd); |
b32843b7 BN |
1363 | int block, ret = 0; |
1364 | ||
1365 | block = (int)(offs >> this->bbt_erase_shift); | |
1366 | ||
1367 | /* Mark bad block in memory */ | |
1368 | bbt_mark_entry(this, block, BBT_BLOCK_WORN); | |
1369 | ||
1370 | /* Update flash-based bad block table */ | |
1371 | if (this->bbt_options & NAND_BBT_USE_FLASH) | |
1372 | ret = nand_update_bbt(mtd, offs); | |
1373 | ||
1374 | return ret; | |
1375 | } |