Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * drivers/mtd/nand_bbt.c | |
3 | * | |
4 | * Overview: | |
5 | * Bad block table support for the NAND driver | |
61b03bd7 | 6 | * |
1da177e4 LT |
7 | * Copyright (C) 2004 Thomas Gleixner (tglx@linutronix.de) |
8 | * | |
1da177e4 LT |
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 | * | |
61b03bd7 | 15 | * When nand_scan_bbt is called, then it tries to find the bad block table |
7cba7b14 | 16 | * depending on the options in the BBT descriptor(s). If no flash based BBT |
bb9ebd4e | 17 | * (NAND_BBT_USE_FLASH) is specified then the device is scanned for factory |
7cba7b14 SAS |
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. | |
1da177e4 | 26 | * If the tables are not versioned, then we "or" the bad block information. |
7cba7b14 SAS |
27 | * If one of the BBTs is out of date or does not exist it is (re)created.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 | |
61b03bd7 | 29 | * good / bad blocks and the bad block tables are created. |
1da177e4 | 30 | * |
7cba7b14 SAS |
31 | * For manufacturer created BBTs like the one found on M-SYS DOC devices |
32 | * the BBT is searched and read but never created | |
1da177e4 | 33 | * |
7cba7b14 | 34 | * The auto generated bad block table is located in the last good blocks |
61b03bd7 | 35 | * of the device. The table is mirrored, so it can be updated eventually. |
7cba7b14 SAS |
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 | |
bb9ebd4e | 39 | * option NAND_BBT_NO_OOB should be used (along with NAND_BBT_USE_FLASH, of |
a40f7341 BN |
40 | * course): it moves the ident pattern and the version byte into the data area |
41 | * and the OOB area will remain untouched. | |
1da177e4 LT |
42 | * |
43 | * The table uses 2 bits per block | |
7cba7b14 SAS |
44 | * 11b: block is good |
45 | * 00b: block is factory marked bad | |
46 | * 01b, 10b: block is marked bad due to wear | |
1da177e4 LT |
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 | |
61b03bd7 | 53 | * |
1da177e4 LT |
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 | |
e0c7d767 | 58 | * - the space necessary for a bbt in FLASH does not exceed a block boundary |
61b03bd7 | 59 | * |
1da177e4 LT |
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> | |
1da177e4 LT |
67 | #include <linux/bitops.h> |
68 | #include <linux/delay.h> | |
c3f8abf4 | 69 | #include <linux/vmalloc.h> |
f3bcc017 | 70 | #include <linux/export.h> |
1da177e4 | 71 | |
7cba7b14 SAS |
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 | ||
61b03bd7 | 82 | /** |
1da177e4 | 83 | * check_pattern - [GENERIC] check if a pattern is in the buffer |
8b6e50c9 BN |
84 | * @buf: the buffer to search |
85 | * @len: the length of buffer to search | |
86 | * @paglen: the pagelength | |
87 | * @td: search pattern descriptor | |
1da177e4 | 88 | * |
8b6e50c9 BN |
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 | */ | |
e0c7d767 | 93 | static int check_pattern(uint8_t *buf, int len, int paglen, struct nand_bbt_descr *td) |
1da177e4 | 94 | { |
171650af | 95 | int i, end = 0; |
1da177e4 LT |
96 | uint8_t *p = buf; |
97 | ||
7cba7b14 SAS |
98 | if (td->options & NAND_BBT_NO_OOB) |
99 | return check_pattern_no_oob(buf, td); | |
100 | ||
c9e05365 | 101 | end = paglen + td->offs; |
1da177e4 LT |
102 | if (td->options & NAND_BBT_SCANEMPTY) { |
103 | for (i = 0; i < end; i++) { | |
104 | if (p[i] != 0xff) | |
105 | return -1; | |
106 | } | |
61b03bd7 | 107 | } |
c9e05365 | 108 | p += end; |
61b03bd7 | 109 | |
1da177e4 | 110 | /* Compare the pattern */ |
75b66d8c BN |
111 | if (memcmp(p, td->pattern, td->len)) |
112 | return -1; | |
58373ff0 | 113 | |
1da177e4 | 114 | if (td->options & NAND_BBT_SCANEMPTY) { |
171650af AB |
115 | p += td->len; |
116 | end += td->len; | |
1da177e4 LT |
117 | for (i = end; i < len; i++) { |
118 | if (*p++ != 0xff) | |
119 | return -1; | |
120 | } | |
121 | } | |
122 | return 0; | |
123 | } | |
124 | ||
61b03bd7 | 125 | /** |
c9e05365 | 126 | * check_short_pattern - [GENERIC] check if a pattern is in the buffer |
8b6e50c9 BN |
127 | * @buf: the buffer to search |
128 | * @td: search pattern descriptor | |
c9e05365 | 129 | * |
8b6e50c9 BN |
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 | */ | |
e0c7d767 | 134 | static int check_short_pattern(uint8_t *buf, struct nand_bbt_descr *td) |
c9e05365 TG |
135 | { |
136 | int i; | |
137 | uint8_t *p = buf; | |
138 | ||
139 | /* Compare the pattern */ | |
140 | for (i = 0; i < td->len; i++) { | |
19870da7 | 141 | if (p[td->offs + i] != td->pattern[i]) |
c9e05365 TG |
142 | return -1; |
143 | } | |
144 | return 0; | |
145 | } | |
146 | ||
7cba7b14 SAS |
147 | /** |
148 | * add_marker_len - compute the length of the marker in data area | |
8b6e50c9 | 149 | * @td: BBT descriptor used for computation |
7cba7b14 | 150 | * |
7854d3f7 | 151 | * The length will be 0 if the marker is located in OOB area. |
7cba7b14 SAS |
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 | ||
1da177e4 LT |
166 | /** |
167 | * read_bbt - [GENERIC] Read the bad block table starting from page | |
8b6e50c9 BN |
168 | * @mtd: MTD device structure |
169 | * @buf: temporary buffer | |
170 | * @page: the starting page | |
171 | * @num: the number of bbt descriptors to read | |
7854d3f7 | 172 | * @td: the bbt describtion table |
8b6e50c9 | 173 | * @offs: offset in the memory table |
1da177e4 LT |
174 | * |
175 | * Read the bad block table starting from page. | |
1da177e4 | 176 | */ |
e0c7d767 | 177 | static int read_bbt(struct mtd_info *mtd, uint8_t *buf, int page, int num, |
df5b4e34 | 178 | struct nand_bbt_descr *td, int offs) |
1da177e4 | 179 | { |
167a8d52 | 180 | int res, ret = 0, i, j, act = 0; |
1da177e4 LT |
181 | struct nand_chip *this = mtd->priv; |
182 | size_t retlen, len, totlen; | |
183 | loff_t from; | |
df5b4e34 | 184 | int bits = td->options & NAND_BBT_NRBITS_MSK; |
596d7452 | 185 | uint8_t msk = (uint8_t)((1 << bits) - 1); |
7cba7b14 | 186 | u32 marker_len; |
df5b4e34 | 187 | int reserved_block_code = td->reserved_block_code; |
1da177e4 LT |
188 | |
189 | totlen = (num * bits) >> 3; | |
7cba7b14 | 190 | marker_len = add_marker_len(td); |
596d7452 | 191 | from = ((loff_t)page) << this->page_shift; |
61b03bd7 | 192 | |
1da177e4 | 193 | while (totlen) { |
596d7452 | 194 | len = min(totlen, (size_t)(1 << this->bbt_erase_shift)); |
7cba7b14 SAS |
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 | } | |
329ad399 | 204 | res = mtd_read(mtd, from, len, &retlen, buf); |
1da177e4 | 205 | if (res < 0) { |
167a8d52 BN |
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"); | |
1da177e4 LT |
216 | return res; |
217 | } | |
61b03bd7 | 218 | } |
1da177e4 LT |
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; | |
e0c7d767 | 227 | if (reserved_block_code && (tmp == reserved_block_code)) { |
d0370219 BN |
228 | pr_info("nand_read_bbt: reserved block at 0x%012llx\n", |
229 | (loff_t)((offs << 2) + (act >> 1)) << this->bbt_erase_shift); | |
1da177e4 | 230 | this->bbt[offs + (act >> 3)] |= 0x2 << (act & 0x06); |
f1a28c02 | 231 | mtd->ecc_stats.bbtblocks++; |
1da177e4 LT |
232 | continue; |
233 | } | |
8b6e50c9 BN |
234 | /* |
235 | * Leave it for now, if it's matured we can | |
a0f5080e | 236 | * move this message to pr_debug. |
8b6e50c9 | 237 | */ |
d0370219 BN |
238 | pr_info("nand_read_bbt: bad block at 0x%012llx\n", |
239 | (loff_t)((offs << 2) + (act >> 1)) << this->bbt_erase_shift); | |
8b6e50c9 | 240 | /* Factory marked bad or worn out? */ |
1da177e4 LT |
241 | if (tmp == 0) |
242 | this->bbt[offs + (act >> 3)] |= 0x3 << (act & 0x06); | |
243 | else | |
244 | this->bbt[offs + (act >> 3)] |= 0x1 << (act & 0x06); | |
f1a28c02 | 245 | mtd->ecc_stats.badblocks++; |
61b03bd7 | 246 | } |
1da177e4 LT |
247 | } |
248 | totlen -= len; | |
249 | from += len; | |
250 | } | |
167a8d52 | 251 | return ret; |
1da177e4 LT |
252 | } |
253 | ||
254 | /** | |
255 | * read_abs_bbt - [GENERIC] Read the bad block table starting at a given page | |
8b6e50c9 BN |
256 | * @mtd: MTD device structure |
257 | * @buf: temporary buffer | |
258 | * @td: descriptor for the bad block table | |
596d7452 | 259 | * @chip: read the table for a specific chip, -1 read all chips; applies only if |
8b6e50c9 | 260 | * NAND_BBT_PERCHIP option is set |
1da177e4 | 261 | * |
8b6e50c9 BN |
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 | */ | |
e0c7d767 | 265 | static int read_abs_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td, int chip) |
1da177e4 LT |
266 | { |
267 | struct nand_chip *this = mtd->priv; | |
268 | int res = 0, i; | |
1da177e4 | 269 | |
1da177e4 LT |
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) | |
df5b4e34 SAS |
274 | res = read_bbt(mtd, buf, td->pages[i], |
275 | this->chipsize >> this->bbt_erase_shift, | |
276 | td, offs); | |
1da177e4 LT |
277 | if (res) |
278 | return res; | |
279 | offs += this->chipsize >> (this->bbt_erase_shift + 2); | |
280 | } | |
281 | } else { | |
df5b4e34 SAS |
282 | res = read_bbt(mtd, buf, td->pages[0], |
283 | mtd->size >> this->bbt_erase_shift, td, 0); | |
1da177e4 LT |
284 | if (res) |
285 | return res; | |
286 | } | |
287 | return 0; | |
288 | } | |
289 | ||
8b6e50c9 | 290 | /* BBT marker is in the first page, no OOB */ |
7cba7b14 SAS |
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 | ||
329ad399 | 301 | return mtd_read(mtd, offs, len, &retlen, buf); |
7cba7b14 SAS |
302 | } |
303 | ||
8b6e50c9 | 304 | /* Scan read raw data from flash */ |
7cba7b14 | 305 | static int scan_read_raw_oob(struct mtd_info *mtd, uint8_t *buf, loff_t offs, |
8593fbc6 TG |
306 | size_t len) |
307 | { | |
308 | struct mtd_oob_ops ops; | |
b64d39d8 | 309 | int res; |
8593fbc6 | 310 | |
0612b9dd | 311 | ops.mode = MTD_OPS_RAW; |
8593fbc6 TG |
312 | ops.ooboffs = 0; |
313 | ops.ooblen = mtd->oobsize; | |
8593fbc6 | 314 | |
b64d39d8 | 315 | while (len > 0) { |
105513cc BN |
316 | ops.datbuf = buf; |
317 | ops.len = min(len, (size_t)mtd->writesize); | |
318 | ops.oobbuf = buf + ops.len; | |
b64d39d8 | 319 | |
fd2819bb | 320 | res = mtd_read_oob(mtd, offs, &ops); |
b64d39d8 | 321 | |
afa17de2 | 322 | if (res) |
105513cc | 323 | return res; |
b64d39d8 ML |
324 | |
325 | buf += mtd->oobsize + mtd->writesize; | |
326 | len -= mtd->writesize; | |
327 | } | |
328 | return 0; | |
8593fbc6 TG |
329 | } |
330 | ||
7cba7b14 SAS |
331 | static int scan_read_raw(struct mtd_info *mtd, uint8_t *buf, loff_t offs, |
332 | size_t len, struct nand_bbt_descr *td) | |
333 | { | |
334 | if (td->options & NAND_BBT_NO_OOB) | |
335 | return scan_read_raw_data(mtd, buf, offs, td); | |
336 | else | |
337 | return scan_read_raw_oob(mtd, buf, offs, len); | |
338 | } | |
339 | ||
8b6e50c9 | 340 | /* Scan write data with oob to flash */ |
8593fbc6 TG |
341 | static int scan_write_bbt(struct mtd_info *mtd, loff_t offs, size_t len, |
342 | uint8_t *buf, uint8_t *oob) | |
343 | { | |
344 | struct mtd_oob_ops ops; | |
345 | ||
0612b9dd | 346 | ops.mode = MTD_OPS_PLACE_OOB; |
8593fbc6 TG |
347 | ops.ooboffs = 0; |
348 | ops.ooblen = mtd->oobsize; | |
349 | ops.datbuf = buf; | |
350 | ops.oobbuf = oob; | |
351 | ops.len = len; | |
352 | ||
a2cc5ba0 | 353 | return mtd_write_oob(mtd, offs, &ops); |
8593fbc6 TG |
354 | } |
355 | ||
7cba7b14 SAS |
356 | static u32 bbt_get_ver_offs(struct mtd_info *mtd, struct nand_bbt_descr *td) |
357 | { | |
358 | u32 ver_offs = td->veroffs; | |
359 | ||
360 | if (!(td->options & NAND_BBT_NO_OOB)) | |
361 | ver_offs += mtd->writesize; | |
362 | return ver_offs; | |
363 | } | |
364 | ||
1da177e4 LT |
365 | /** |
366 | * read_abs_bbts - [GENERIC] Read the bad block table(s) for all chips starting at a given page | |
8b6e50c9 BN |
367 | * @mtd: MTD device structure |
368 | * @buf: temporary buffer | |
369 | * @td: descriptor for the bad block table | |
370 | * @md: descriptor for the bad block table mirror | |
1da177e4 | 371 | * |
8b6e50c9 BN |
372 | * Read the bad block table(s) for all chips starting at a given page. We |
373 | * assume that the bbt bits are in consecutive order. | |
374 | */ | |
8593fbc6 TG |
375 | static int read_abs_bbts(struct mtd_info *mtd, uint8_t *buf, |
376 | struct nand_bbt_descr *td, struct nand_bbt_descr *md) | |
1da177e4 LT |
377 | { |
378 | struct nand_chip *this = mtd->priv; | |
379 | ||
61b03bd7 | 380 | /* Read the primary version, if available */ |
1da177e4 | 381 | if (td->options & NAND_BBT_VERSION) { |
69423d99 | 382 | scan_read_raw(mtd, buf, (loff_t)td->pages[0] << this->page_shift, |
7cba7b14 SAS |
383 | mtd->writesize, td); |
384 | td->version[0] = buf[bbt_get_ver_offs(mtd, td)]; | |
9a4d4d69 | 385 | pr_info("Bad block table at page %d, version 0x%02X\n", |
d0370219 | 386 | td->pages[0], td->version[0]); |
1da177e4 LT |
387 | } |
388 | ||
61b03bd7 | 389 | /* Read the mirror version, if available */ |
1da177e4 | 390 | if (md && (md->options & NAND_BBT_VERSION)) { |
69423d99 | 391 | scan_read_raw(mtd, buf, (loff_t)md->pages[0] << this->page_shift, |
7cba7b14 SAS |
392 | mtd->writesize, td); |
393 | md->version[0] = buf[bbt_get_ver_offs(mtd, md)]; | |
9a4d4d69 | 394 | pr_info("Bad block table at page %d, version 0x%02X\n", |
d0370219 | 395 | md->pages[0], md->version[0]); |
1da177e4 | 396 | } |
1da177e4 LT |
397 | return 1; |
398 | } | |
399 | ||
8b6e50c9 | 400 | /* Scan a given block full */ |
8593fbc6 TG |
401 | static int scan_block_full(struct mtd_info *mtd, struct nand_bbt_descr *bd, |
402 | loff_t offs, uint8_t *buf, size_t readlen, | |
403 | int scanlen, int len) | |
404 | { | |
405 | int ret, j; | |
406 | ||
7cba7b14 | 407 | ret = scan_read_raw_oob(mtd, buf, offs, readlen); |
afa17de2 | 408 | /* Ignore ECC errors when checking for BBM */ |
d57f4054 | 409 | if (ret && !mtd_is_bitflip_or_eccerr(ret)) |
8593fbc6 TG |
410 | return ret; |
411 | ||
412 | for (j = 0; j < len; j++, buf += scanlen) { | |
413 | if (check_pattern(buf, scanlen, mtd->writesize, bd)) | |
414 | return 1; | |
415 | } | |
416 | return 0; | |
417 | } | |
418 | ||
8b6e50c9 | 419 | /* Scan a given block partially */ |
8593fbc6 TG |
420 | static int scan_block_fast(struct mtd_info *mtd, struct nand_bbt_descr *bd, |
421 | loff_t offs, uint8_t *buf, int len) | |
422 | { | |
423 | struct mtd_oob_ops ops; | |
424 | int j, ret; | |
425 | ||
8593fbc6 TG |
426 | ops.ooblen = mtd->oobsize; |
427 | ops.oobbuf = buf; | |
428 | ops.ooboffs = 0; | |
429 | ops.datbuf = NULL; | |
0612b9dd | 430 | ops.mode = MTD_OPS_PLACE_OOB; |
8593fbc6 TG |
431 | |
432 | for (j = 0; j < len; j++) { | |
433 | /* | |
8b6e50c9 BN |
434 | * Read the full oob until read_oob is fixed to handle single |
435 | * byte reads for 16 bit buswidth. | |
8593fbc6 | 436 | */ |
fd2819bb | 437 | ret = mtd_read_oob(mtd, offs, &ops); |
903cd06c | 438 | /* Ignore ECC errors when checking for BBM */ |
d57f4054 | 439 | if (ret && !mtd_is_bitflip_or_eccerr(ret)) |
8593fbc6 TG |
440 | return ret; |
441 | ||
442 | if (check_short_pattern(buf, bd)) | |
443 | return 1; | |
444 | ||
445 | offs += mtd->writesize; | |
446 | } | |
447 | return 0; | |
448 | } | |
449 | ||
1da177e4 LT |
450 | /** |
451 | * create_bbt - [GENERIC] Create a bad block table by scanning the device | |
8b6e50c9 BN |
452 | * @mtd: MTD device structure |
453 | * @buf: temporary buffer | |
454 | * @bd: descriptor for the good/bad block search pattern | |
455 | * @chip: create the table for a specific chip, -1 read all chips; applies only | |
456 | * if NAND_BBT_PERCHIP option is set | |
1da177e4 | 457 | * |
8b6e50c9 BN |
458 | * Create a bad block table by scanning the device for the given good/bad block |
459 | * identify pattern. | |
1da177e4 | 460 | */ |
8593fbc6 TG |
461 | static int create_bbt(struct mtd_info *mtd, uint8_t *buf, |
462 | struct nand_bbt_descr *bd, int chip) | |
1da177e4 LT |
463 | { |
464 | struct nand_chip *this = mtd->priv; | |
8593fbc6 | 465 | int i, numblocks, len, scanlen; |
1da177e4 LT |
466 | int startblock; |
467 | loff_t from; | |
8593fbc6 | 468 | size_t readlen; |
1da177e4 | 469 | |
9a4d4d69 | 470 | pr_info("Scanning device for bad blocks\n"); |
1da177e4 LT |
471 | |
472 | if (bd->options & NAND_BBT_SCANALLPAGES) | |
473 | len = 1 << (this->bbt_erase_shift - this->page_shift); | |
58373ff0 BN |
474 | else if (bd->options & NAND_BBT_SCAN2NDPAGE) |
475 | len = 2; | |
476 | else | |
477 | len = 1; | |
171650af AB |
478 | |
479 | if (!(bd->options & NAND_BBT_SCANEMPTY)) { | |
480 | /* We need only read few bytes from the OOB area */ | |
8593fbc6 | 481 | scanlen = 0; |
eeada24d AB |
482 | readlen = bd->len; |
483 | } else { | |
171650af | 484 | /* Full page content should be read */ |
28318776 JE |
485 | scanlen = mtd->writesize + mtd->oobsize; |
486 | readlen = len * mtd->writesize; | |
eeada24d | 487 | } |
1da177e4 LT |
488 | |
489 | if (chip == -1) { | |
8b6e50c9 BN |
490 | /* |
491 | * Note that numblocks is 2 * (real numblocks) here, see i+=2 | |
492 | * below as it makes shifting and masking less painful | |
493 | */ | |
1da177e4 LT |
494 | numblocks = mtd->size >> (this->bbt_erase_shift - 1); |
495 | startblock = 0; | |
496 | from = 0; | |
497 | } else { | |
498 | if (chip >= this->numchips) { | |
9a4d4d69 | 499 | pr_warn("create_bbt(): chipnr (%d) > available chips (%d)\n", |
e0c7d767 | 500 | chip + 1, this->numchips); |
171650af | 501 | return -EINVAL; |
1da177e4 LT |
502 | } |
503 | numblocks = this->chipsize >> (this->bbt_erase_shift - 1); | |
504 | startblock = chip * numblocks; | |
505 | numblocks += startblock; | |
69423d99 | 506 | from = (loff_t)startblock << (this->bbt_erase_shift - 1); |
1da177e4 | 507 | } |
61b03bd7 | 508 | |
5fb1549d | 509 | if (this->bbt_options & NAND_BBT_SCANLASTPAGE) |
b60b08b0 KC |
510 | from += mtd->erasesize - (mtd->writesize * len); |
511 | ||
1da177e4 | 512 | for (i = startblock; i < numblocks;) { |
eeada24d | 513 | int ret; |
61b03bd7 | 514 | |
7cba7b14 SAS |
515 | BUG_ON(bd->options & NAND_BBT_NO_OOB); |
516 | ||
8593fbc6 TG |
517 | if (bd->options & NAND_BBT_SCANALLPAGES) |
518 | ret = scan_block_full(mtd, bd, from, buf, readlen, | |
519 | scanlen, len); | |
520 | else | |
521 | ret = scan_block_fast(mtd, bd, from, buf, len); | |
522 | ||
523 | if (ret < 0) | |
524 | return ret; | |
525 | ||
526 | if (ret) { | |
527 | this->bbt[i >> 3] |= 0x03 << (i & 0x6); | |
9a4d4d69 | 528 | pr_warn("Bad eraseblock %d at 0x%012llx\n", |
d0370219 | 529 | i >> 1, (unsigned long long)from); |
f1a28c02 | 530 | mtd->ecc_stats.badblocks++; |
1da177e4 | 531 | } |
8593fbc6 | 532 | |
1da177e4 LT |
533 | i += 2; |
534 | from += (1 << this->bbt_erase_shift); | |
535 | } | |
eeada24d | 536 | return 0; |
1da177e4 LT |
537 | } |
538 | ||
539 | /** | |
540 | * search_bbt - [GENERIC] scan the device for a specific bad block table | |
8b6e50c9 BN |
541 | * @mtd: MTD device structure |
542 | * @buf: temporary buffer | |
543 | * @td: descriptor for the bad block table | |
1da177e4 | 544 | * |
8b6e50c9 BN |
545 | * Read the bad block table by searching for a given ident pattern. Search is |
546 | * preformed either from the beginning up or from the end of the device | |
547 | * downwards. The search starts always at the start of a block. If the option | |
548 | * NAND_BBT_PERCHIP is given, each chip is searched for a bbt, which contains | |
549 | * the bad block information of this chip. This is necessary to provide support | |
550 | * for certain DOC devices. | |
1da177e4 | 551 | * |
8b6e50c9 | 552 | * The bbt ident pattern resides in the oob area of the first page in a block. |
1da177e4 | 553 | */ |
e0c7d767 | 554 | static int search_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td) |
1da177e4 LT |
555 | { |
556 | struct nand_chip *this = mtd->priv; | |
557 | int i, chips; | |
558 | int bits, startblock, block, dir; | |
28318776 | 559 | int scanlen = mtd->writesize + mtd->oobsize; |
1da177e4 | 560 | int bbtblocks; |
8593fbc6 | 561 | int blocktopage = this->bbt_erase_shift - this->page_shift; |
1da177e4 | 562 | |
8b6e50c9 | 563 | /* Search direction top -> down? */ |
1da177e4 | 564 | if (td->options & NAND_BBT_LASTBLOCK) { |
e0c7d767 | 565 | startblock = (mtd->size >> this->bbt_erase_shift) - 1; |
1da177e4 LT |
566 | dir = -1; |
567 | } else { | |
61b03bd7 | 568 | startblock = 0; |
1da177e4 | 569 | dir = 1; |
61b03bd7 TG |
570 | } |
571 | ||
8b6e50c9 | 572 | /* Do we have a bbt per chip? */ |
1da177e4 LT |
573 | if (td->options & NAND_BBT_PERCHIP) { |
574 | chips = this->numchips; | |
575 | bbtblocks = this->chipsize >> this->bbt_erase_shift; | |
576 | startblock &= bbtblocks - 1; | |
577 | } else { | |
578 | chips = 1; | |
579 | bbtblocks = mtd->size >> this->bbt_erase_shift; | |
580 | } | |
61b03bd7 | 581 | |
1da177e4 LT |
582 | /* Number of bits for each erase block in the bbt */ |
583 | bits = td->options & NAND_BBT_NRBITS_MSK; | |
61b03bd7 | 584 | |
1da177e4 LT |
585 | for (i = 0; i < chips; i++) { |
586 | /* Reset version information */ | |
61b03bd7 | 587 | td->version[i] = 0; |
1da177e4 LT |
588 | td->pages[i] = -1; |
589 | /* Scan the maximum number of blocks */ | |
590 | for (block = 0; block < td->maxblocks; block++) { | |
8593fbc6 | 591 | |
1da177e4 | 592 | int actblock = startblock + dir * block; |
69423d99 | 593 | loff_t offs = (loff_t)actblock << this->bbt_erase_shift; |
8593fbc6 | 594 | |
1da177e4 | 595 | /* Read first page */ |
7cba7b14 | 596 | scan_read_raw(mtd, buf, offs, mtd->writesize, td); |
28318776 | 597 | if (!check_pattern(buf, scanlen, mtd->writesize, td)) { |
8593fbc6 | 598 | td->pages[i] = actblock << blocktopage; |
1da177e4 | 599 | if (td->options & NAND_BBT_VERSION) { |
7cba7b14 SAS |
600 | offs = bbt_get_ver_offs(mtd, td); |
601 | td->version[i] = buf[offs]; | |
1da177e4 LT |
602 | } |
603 | break; | |
604 | } | |
605 | } | |
606 | startblock += this->chipsize >> this->bbt_erase_shift; | |
607 | } | |
608 | /* Check, if we found a bbt for each requested chip */ | |
609 | for (i = 0; i < chips; i++) { | |
610 | if (td->pages[i] == -1) | |
9a4d4d69 | 611 | pr_warn("Bad block table not found for chip %d\n", i); |
1da177e4 | 612 | else |
d0370219 BN |
613 | pr_info("Bad block table found at page %d, version " |
614 | "0x%02X\n", td->pages[i], td->version[i]); | |
1da177e4 | 615 | } |
61b03bd7 | 616 | return 0; |
1da177e4 LT |
617 | } |
618 | ||
619 | /** | |
620 | * search_read_bbts - [GENERIC] scan the device for bad block table(s) | |
8b6e50c9 BN |
621 | * @mtd: MTD device structure |
622 | * @buf: temporary buffer | |
623 | * @td: descriptor for the bad block table | |
624 | * @md: descriptor for the bad block table mirror | |
1da177e4 | 625 | * |
8b6e50c9 BN |
626 | * Search and read the bad block table(s). |
627 | */ | |
e0c7d767 | 628 | static int search_read_bbts(struct mtd_info *mtd, uint8_t * buf, struct nand_bbt_descr *td, struct nand_bbt_descr *md) |
1da177e4 LT |
629 | { |
630 | /* Search the primary table */ | |
e0c7d767 | 631 | search_bbt(mtd, buf, td); |
61b03bd7 | 632 | |
1da177e4 LT |
633 | /* Search the mirror table */ |
634 | if (md) | |
e0c7d767 | 635 | search_bbt(mtd, buf, md); |
61b03bd7 | 636 | |
1da177e4 | 637 | /* Force result check */ |
61b03bd7 | 638 | return 1; |
1da177e4 | 639 | } |
1da177e4 | 640 | |
61b03bd7 | 641 | /** |
1da177e4 | 642 | * write_bbt - [GENERIC] (Re)write the bad block table |
8b6e50c9 BN |
643 | * @mtd: MTD device structure |
644 | * @buf: temporary buffer | |
645 | * @td: descriptor for the bad block table | |
646 | * @md: descriptor for the bad block table mirror | |
647 | * @chipsel: selector for a specific chip, -1 for all | |
1da177e4 | 648 | * |
8b6e50c9 BN |
649 | * (Re)write the bad block table. |
650 | */ | |
e0c7d767 | 651 | static int write_bbt(struct mtd_info *mtd, uint8_t *buf, |
9223a456 TG |
652 | struct nand_bbt_descr *td, struct nand_bbt_descr *md, |
653 | int chipsel) | |
1da177e4 LT |
654 | { |
655 | struct nand_chip *this = mtd->priv; | |
1da177e4 LT |
656 | struct erase_info einfo; |
657 | int i, j, res, chip = 0; | |
658 | int bits, startblock, dir, page, offs, numblocks, sft, sftmsk; | |
9223a456 | 659 | int nrchips, bbtoffs, pageoffs, ooboffs; |
1da177e4 LT |
660 | uint8_t msk[4]; |
661 | uint8_t rcode = td->reserved_block_code; | |
8593fbc6 | 662 | size_t retlen, len = 0; |
1da177e4 | 663 | loff_t to; |
8593fbc6 TG |
664 | struct mtd_oob_ops ops; |
665 | ||
666 | ops.ooblen = mtd->oobsize; | |
667 | ops.ooboffs = 0; | |
668 | ops.datbuf = NULL; | |
0612b9dd | 669 | ops.mode = MTD_OPS_PLACE_OOB; |
1da177e4 LT |
670 | |
671 | if (!rcode) | |
672 | rcode = 0xff; | |
8b6e50c9 | 673 | /* Write bad block table per chip rather than per device? */ |
1da177e4 | 674 | if (td->options & NAND_BBT_PERCHIP) { |
e0c7d767 | 675 | numblocks = (int)(this->chipsize >> this->bbt_erase_shift); |
8b6e50c9 | 676 | /* Full device write or specific chip? */ |
1da177e4 LT |
677 | if (chipsel == -1) { |
678 | nrchips = this->numchips; | |
679 | } else { | |
680 | nrchips = chipsel + 1; | |
681 | chip = chipsel; | |
682 | } | |
683 | } else { | |
e0c7d767 | 684 | numblocks = (int)(mtd->size >> this->bbt_erase_shift); |
1da177e4 | 685 | nrchips = 1; |
61b03bd7 TG |
686 | } |
687 | ||
1da177e4 LT |
688 | /* Loop through the chips */ |
689 | for (; chip < nrchips; chip++) { | |
8b6e50c9 BN |
690 | /* |
691 | * There was already a version of the table, reuse the page | |
61b03bd7 | 692 | * This applies for absolute placement too, as we have the |
1da177e4 LT |
693 | * page nr. in td->pages. |
694 | */ | |
695 | if (td->pages[chip] != -1) { | |
696 | page = td->pages[chip]; | |
697 | goto write; | |
61b03bd7 | 698 | } |
1da177e4 | 699 | |
8b6e50c9 BN |
700 | /* |
701 | * Automatic placement of the bad block table. Search direction | |
702 | * top -> down? | |
703 | */ | |
1da177e4 LT |
704 | if (td->options & NAND_BBT_LASTBLOCK) { |
705 | startblock = numblocks * (chip + 1) - 1; | |
706 | dir = -1; | |
707 | } else { | |
708 | startblock = chip * numblocks; | |
709 | dir = 1; | |
61b03bd7 | 710 | } |
1da177e4 LT |
711 | |
712 | for (i = 0; i < td->maxblocks; i++) { | |
713 | int block = startblock + dir * i; | |
714 | /* Check, if the block is bad */ | |
9223a456 TG |
715 | switch ((this->bbt[block >> 2] >> |
716 | (2 * (block & 0x03))) & 0x03) { | |
1da177e4 LT |
717 | case 0x01: |
718 | case 0x03: | |
719 | continue; | |
720 | } | |
9223a456 TG |
721 | page = block << |
722 | (this->bbt_erase_shift - this->page_shift); | |
1da177e4 LT |
723 | /* Check, if the block is used by the mirror table */ |
724 | if (!md || md->pages[chip] != page) | |
725 | goto write; | |
726 | } | |
9a4d4d69 | 727 | pr_err("No space left to write bad block table\n"); |
1da177e4 | 728 | return -ENOSPC; |
e0c7d767 | 729 | write: |
1da177e4 LT |
730 | |
731 | /* Set up shift count and masks for the flash table */ | |
732 | bits = td->options & NAND_BBT_NRBITS_MSK; | |
9223a456 | 733 | msk[2] = ~rcode; |
1da177e4 | 734 | switch (bits) { |
9223a456 TG |
735 | case 1: sft = 3; sftmsk = 0x07; msk[0] = 0x00; msk[1] = 0x01; |
736 | msk[3] = 0x01; | |
737 | break; | |
738 | case 2: sft = 2; sftmsk = 0x06; msk[0] = 0x00; msk[1] = 0x01; | |
739 | msk[3] = 0x03; | |
740 | break; | |
741 | case 4: sft = 1; sftmsk = 0x04; msk[0] = 0x00; msk[1] = 0x0C; | |
742 | msk[3] = 0x0f; | |
743 | break; | |
744 | case 8: sft = 0; sftmsk = 0x00; msk[0] = 0x00; msk[1] = 0x0F; | |
745 | msk[3] = 0xff; | |
746 | break; | |
1da177e4 LT |
747 | default: return -EINVAL; |
748 | } | |
61b03bd7 | 749 | |
1da177e4 | 750 | bbtoffs = chip * (numblocks >> 2); |
61b03bd7 | 751 | |
596d7452 | 752 | to = ((loff_t)page) << this->page_shift; |
1da177e4 | 753 | |
8b6e50c9 | 754 | /* Must we save the block contents? */ |
1da177e4 LT |
755 | if (td->options & NAND_BBT_SAVECONTENT) { |
756 | /* Make it block aligned */ | |
596d7452 | 757 | to &= ~((loff_t)((1 << this->bbt_erase_shift) - 1)); |
1da177e4 | 758 | len = 1 << this->bbt_erase_shift; |
329ad399 | 759 | res = mtd_read(mtd, to, len, &retlen, buf); |
1da177e4 LT |
760 | if (res < 0) { |
761 | if (retlen != len) { | |
d0370219 BN |
762 | pr_info("nand_bbt: error reading block " |
763 | "for writing the bad block table\n"); | |
1da177e4 LT |
764 | return res; |
765 | } | |
d0370219 BN |
766 | pr_warn("nand_bbt: ECC error while reading " |
767 | "block for writing bad block table\n"); | |
1da177e4 | 768 | } |
9223a456 | 769 | /* Read oob data */ |
7014568b | 770 | ops.ooblen = (len >> this->page_shift) * mtd->oobsize; |
8593fbc6 | 771 | ops.oobbuf = &buf[len]; |
fd2819bb | 772 | res = mtd_read_oob(mtd, to + mtd->writesize, &ops); |
7014568b | 773 | if (res < 0 || ops.oobretlen != ops.ooblen) |
9223a456 TG |
774 | goto outerr; |
775 | ||
1da177e4 LT |
776 | /* Calc the byte offset in the buffer */ |
777 | pageoffs = page - (int)(to >> this->page_shift); | |
778 | offs = pageoffs << this->page_shift; | |
779 | /* Preset the bbt area with 0xff */ | |
596d7452 | 780 | memset(&buf[offs], 0xff, (size_t)(numblocks >> sft)); |
9223a456 TG |
781 | ooboffs = len + (pageoffs * mtd->oobsize); |
782 | ||
7cba7b14 SAS |
783 | } else if (td->options & NAND_BBT_NO_OOB) { |
784 | ooboffs = 0; | |
785 | offs = td->len; | |
8b6e50c9 | 786 | /* The version byte */ |
7cba7b14 SAS |
787 | if (td->options & NAND_BBT_VERSION) |
788 | offs++; | |
789 | /* Calc length */ | |
596d7452 | 790 | len = (size_t)(numblocks >> sft); |
7cba7b14 | 791 | len += offs; |
8b6e50c9 | 792 | /* Make it page aligned! */ |
7cba7b14 SAS |
793 | len = ALIGN(len, mtd->writesize); |
794 | /* Preset the buffer with 0xff */ | |
795 | memset(buf, 0xff, len); | |
796 | /* Pattern is located at the begin of first page */ | |
797 | memcpy(buf, td->pattern, td->len); | |
1da177e4 LT |
798 | } else { |
799 | /* Calc length */ | |
596d7452 | 800 | len = (size_t)(numblocks >> sft); |
8b6e50c9 | 801 | /* Make it page aligned! */ |
cda32091 | 802 | len = ALIGN(len, mtd->writesize); |
1da177e4 | 803 | /* Preset the buffer with 0xff */ |
9223a456 TG |
804 | memset(buf, 0xff, len + |
805 | (len >> this->page_shift)* mtd->oobsize); | |
1da177e4 | 806 | offs = 0; |
9223a456 | 807 | ooboffs = len; |
1da177e4 | 808 | /* Pattern is located in oob area of first page */ |
9223a456 | 809 | memcpy(&buf[ooboffs + td->offs], td->pattern, td->len); |
1da177e4 | 810 | } |
61b03bd7 | 811 | |
9223a456 TG |
812 | if (td->options & NAND_BBT_VERSION) |
813 | buf[ooboffs + td->veroffs] = td->version[chip]; | |
814 | ||
8b6e50c9 | 815 | /* Walk through the memory table */ |
e0c7d767 | 816 | for (i = 0; i < numblocks;) { |
1da177e4 LT |
817 | uint8_t dat; |
818 | dat = this->bbt[bbtoffs + (i >> 2)]; | |
e0c7d767 | 819 | for (j = 0; j < 4; j++, i++) { |
1da177e4 | 820 | int sftcnt = (i << (3 - sft)) & sftmsk; |
8b6e50c9 | 821 | /* Do not store the reserved bbt blocks! */ |
9223a456 TG |
822 | buf[offs + (i >> sft)] &= |
823 | ~(msk[dat & 0x03] << sftcnt); | |
1da177e4 LT |
824 | dat >>= 2; |
825 | } | |
826 | } | |
61b03bd7 | 827 | |
e0c7d767 | 828 | memset(&einfo, 0, sizeof(einfo)); |
1da177e4 | 829 | einfo.mtd = mtd; |
69423d99 | 830 | einfo.addr = to; |
1da177e4 | 831 | einfo.len = 1 << this->bbt_erase_shift; |
e0c7d767 | 832 | res = nand_erase_nand(mtd, &einfo, 1); |
9223a456 TG |
833 | if (res < 0) |
834 | goto outerr; | |
61b03bd7 | 835 | |
7cba7b14 SAS |
836 | res = scan_write_bbt(mtd, to, len, buf, |
837 | td->options & NAND_BBT_NO_OOB ? NULL : | |
838 | &buf[len]); | |
9223a456 TG |
839 | if (res < 0) |
840 | goto outerr; | |
841 | ||
d0370219 BN |
842 | pr_info("Bad block table written to 0x%012llx, version 0x%02X\n", |
843 | (unsigned long long)to, td->version[chip]); | |
61b03bd7 | 844 | |
1da177e4 LT |
845 | /* Mark it as used */ |
846 | td->pages[chip] = page; | |
61b03bd7 | 847 | } |
1da177e4 | 848 | return 0; |
9223a456 TG |
849 | |
850 | outerr: | |
d0370219 | 851 | pr_warn("nand_bbt: error while writing bad block table %d\n", res); |
9223a456 | 852 | return res; |
1da177e4 LT |
853 | } |
854 | ||
855 | /** | |
856 | * nand_memory_bbt - [GENERIC] create a memory based bad block table | |
8b6e50c9 BN |
857 | * @mtd: MTD device structure |
858 | * @bd: descriptor for the good/bad block search pattern | |
1da177e4 | 859 | * |
8b6e50c9 BN |
860 | * The function creates a memory based bbt by scanning the device for |
861 | * manufacturer / software marked good / bad blocks. | |
862 | */ | |
e0c7d767 | 863 | static inline int nand_memory_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd) |
1da177e4 LT |
864 | { |
865 | struct nand_chip *this = mtd->priv; | |
866 | ||
171650af | 867 | bd->options &= ~NAND_BBT_SCANEMPTY; |
4bf63fcb | 868 | return create_bbt(mtd, this->buffers->databuf, bd, -1); |
1da177e4 LT |
869 | } |
870 | ||
871 | /** | |
e0c7d767 | 872 | * check_create - [GENERIC] create and write bbt(s) if necessary |
8b6e50c9 BN |
873 | * @mtd: MTD device structure |
874 | * @buf: temporary buffer | |
875 | * @bd: descriptor for the good/bad block search pattern | |
1da177e4 | 876 | * |
8b6e50c9 BN |
877 | * The function checks the results of the previous call to read_bbt and creates |
878 | * / updates the bbt(s) if necessary. Creation is necessary if no bbt was found | |
879 | * for the chip/device. Update is necessary if one of the tables is missing or | |
880 | * the version nr. of one table is less than the other. | |
881 | */ | |
e0c7d767 | 882 | static int check_create(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *bd) |
1da177e4 | 883 | { |
623978de | 884 | int i, chips, writeops, create, chipsel, res, res2; |
1da177e4 LT |
885 | struct nand_chip *this = mtd->priv; |
886 | struct nand_bbt_descr *td = this->bbt_td; | |
887 | struct nand_bbt_descr *md = this->bbt_md; | |
888 | struct nand_bbt_descr *rd, *rd2; | |
889 | ||
8b6e50c9 | 890 | /* Do we have a bbt per chip? */ |
61b03bd7 | 891 | if (td->options & NAND_BBT_PERCHIP) |
1da177e4 | 892 | chips = this->numchips; |
61b03bd7 | 893 | else |
1da177e4 | 894 | chips = 1; |
61b03bd7 | 895 | |
1da177e4 LT |
896 | for (i = 0; i < chips; i++) { |
897 | writeops = 0; | |
b61bf5bb | 898 | create = 0; |
1da177e4 LT |
899 | rd = NULL; |
900 | rd2 = NULL; | |
623978de | 901 | res = res2 = 0; |
8b6e50c9 | 902 | /* Per chip or per device? */ |
1da177e4 | 903 | chipsel = (td->options & NAND_BBT_PERCHIP) ? i : -1; |
8b6e50c9 | 904 | /* Mirrored table available? */ |
1da177e4 LT |
905 | if (md) { |
906 | if (td->pages[i] == -1 && md->pages[i] == -1) { | |
b61bf5bb | 907 | create = 1; |
1da177e4 | 908 | writeops = 0x03; |
c5e8ef9c | 909 | } else if (td->pages[i] == -1) { |
61b03bd7 | 910 | rd = md; |
596d7452 | 911 | writeops = 0x01; |
c5e8ef9c | 912 | } else if (md->pages[i] == -1) { |
1da177e4 | 913 | rd = td; |
596d7452 | 914 | writeops = 0x02; |
c5e8ef9c | 915 | } else if (td->version[i] == md->version[i]) { |
1da177e4 LT |
916 | rd = td; |
917 | if (!(td->options & NAND_BBT_VERSION)) | |
918 | rd2 = md; | |
c5e8ef9c | 919 | } else if (((int8_t)(td->version[i] - md->version[i])) > 0) { |
1da177e4 | 920 | rd = td; |
596d7452 | 921 | writeops = 0x02; |
1da177e4 LT |
922 | } else { |
923 | rd = md; | |
596d7452 | 924 | writeops = 0x01; |
1da177e4 | 925 | } |
1da177e4 LT |
926 | } else { |
927 | if (td->pages[i] == -1) { | |
b61bf5bb | 928 | create = 1; |
1da177e4 | 929 | writeops = 0x01; |
b61bf5bb BN |
930 | } else { |
931 | rd = td; | |
1da177e4 | 932 | } |
1da177e4 | 933 | } |
61b03bd7 | 934 | |
b61bf5bb BN |
935 | if (create) { |
936 | /* Create the bad block table by scanning the device? */ | |
937 | if (!(td->options & NAND_BBT_CREATE)) | |
938 | continue; | |
939 | ||
940 | /* Create the table in memory by scanning the chip(s) */ | |
941 | if (!(this->bbt_options & NAND_BBT_CREATE_EMPTY)) | |
942 | create_bbt(mtd, buf, bd, chipsel); | |
943 | ||
944 | td->version[i] = 1; | |
945 | if (md) | |
946 | md->version[i] = 1; | |
947 | } | |
948 | ||
8b6e50c9 | 949 | /* Read back first? */ |
623978de BN |
950 | if (rd) { |
951 | res = read_abs_bbt(mtd, buf, rd, chipsel); | |
952 | if (mtd_is_eccerr(res)) { | |
953 | /* Mark table as invalid */ | |
954 | rd->pages[i] = -1; | |
dadc17a3 | 955 | rd->version[i] = 0; |
623978de BN |
956 | i--; |
957 | continue; | |
958 | } | |
959 | } | |
8b6e50c9 | 960 | /* If they weren't versioned, read both */ |
623978de BN |
961 | if (rd2) { |
962 | res2 = read_abs_bbt(mtd, buf, rd2, chipsel); | |
963 | if (mtd_is_eccerr(res2)) { | |
964 | /* Mark table as invalid */ | |
965 | rd2->pages[i] = -1; | |
dadc17a3 | 966 | rd2->version[i] = 0; |
623978de BN |
967 | i--; |
968 | continue; | |
969 | } | |
970 | } | |
971 | ||
972 | /* Scrub the flash table(s)? */ | |
973 | if (mtd_is_bitflip(res) || mtd_is_bitflip(res2)) | |
974 | writeops = 0x03; | |
1da177e4 | 975 | |
dadc17a3 BN |
976 | /* Update version numbers before writing */ |
977 | if (md) { | |
978 | td->version[i] = max(td->version[i], md->version[i]); | |
979 | md->version[i] = td->version[i]; | |
980 | } | |
981 | ||
8b6e50c9 | 982 | /* Write the bad block table to the device? */ |
1da177e4 | 983 | if ((writeops & 0x01) && (td->options & NAND_BBT_WRITE)) { |
e0c7d767 | 984 | res = write_bbt(mtd, buf, td, md, chipsel); |
1da177e4 LT |
985 | if (res < 0) |
986 | return res; | |
987 | } | |
61b03bd7 | 988 | |
8b6e50c9 | 989 | /* Write the mirror bad block table to the device? */ |
1da177e4 | 990 | if ((writeops & 0x02) && md && (md->options & NAND_BBT_WRITE)) { |
e0c7d767 | 991 | res = write_bbt(mtd, buf, md, td, chipsel); |
1da177e4 LT |
992 | if (res < 0) |
993 | return res; | |
994 | } | |
995 | } | |
61b03bd7 | 996 | return 0; |
1da177e4 LT |
997 | } |
998 | ||
999 | /** | |
61b03bd7 | 1000 | * mark_bbt_regions - [GENERIC] mark the bad block table regions |
8b6e50c9 BN |
1001 | * @mtd: MTD device structure |
1002 | * @td: bad block table descriptor | |
1da177e4 | 1003 | * |
8b6e50c9 BN |
1004 | * The bad block table regions are marked as "bad" to prevent accidental |
1005 | * erasures / writes. The regions are identified by the mark 0x02. | |
1006 | */ | |
e0c7d767 | 1007 | static void mark_bbt_region(struct mtd_info *mtd, struct nand_bbt_descr *td) |
1da177e4 LT |
1008 | { |
1009 | struct nand_chip *this = mtd->priv; | |
1010 | int i, j, chips, block, nrblocks, update; | |
1011 | uint8_t oldval, newval; | |
1012 | ||
8b6e50c9 | 1013 | /* Do we have a bbt per chip? */ |
1da177e4 LT |
1014 | if (td->options & NAND_BBT_PERCHIP) { |
1015 | chips = this->numchips; | |
1016 | nrblocks = (int)(this->chipsize >> this->bbt_erase_shift); | |
1017 | } else { | |
1018 | chips = 1; | |
1019 | nrblocks = (int)(mtd->size >> this->bbt_erase_shift); | |
61b03bd7 TG |
1020 | } |
1021 | ||
1da177e4 LT |
1022 | for (i = 0; i < chips; i++) { |
1023 | if ((td->options & NAND_BBT_ABSPAGE) || | |
1024 | !(td->options & NAND_BBT_WRITE)) { | |
e0c7d767 DW |
1025 | if (td->pages[i] == -1) |
1026 | continue; | |
1da177e4 | 1027 | block = td->pages[i] >> (this->bbt_erase_shift - this->page_shift); |
61b03bd7 | 1028 | block <<= 1; |
1da177e4 LT |
1029 | oldval = this->bbt[(block >> 3)]; |
1030 | newval = oldval | (0x2 << (block & 0x06)); | |
1031 | this->bbt[(block >> 3)] = newval; | |
1032 | if ((oldval != newval) && td->reserved_block_code) | |
69423d99 | 1033 | nand_update_bbt(mtd, (loff_t)block << (this->bbt_erase_shift - 1)); |
1da177e4 LT |
1034 | continue; |
1035 | } | |
1036 | update = 0; | |
1037 | if (td->options & NAND_BBT_LASTBLOCK) | |
1038 | block = ((i + 1) * nrblocks) - td->maxblocks; | |
61b03bd7 | 1039 | else |
1da177e4 | 1040 | block = i * nrblocks; |
61b03bd7 | 1041 | block <<= 1; |
1da177e4 LT |
1042 | for (j = 0; j < td->maxblocks; j++) { |
1043 | oldval = this->bbt[(block >> 3)]; | |
1044 | newval = oldval | (0x2 << (block & 0x06)); | |
1045 | this->bbt[(block >> 3)] = newval; | |
e0c7d767 DW |
1046 | if (oldval != newval) |
1047 | update = 1; | |
1da177e4 | 1048 | block += 2; |
61b03bd7 | 1049 | } |
8b6e50c9 BN |
1050 | /* |
1051 | * If we want reserved blocks to be recorded to flash, and some | |
1052 | * new ones have been marked, then we need to update the stored | |
1053 | * bbts. This should only happen once. | |
1054 | */ | |
1da177e4 | 1055 | if (update && td->reserved_block_code) |
69423d99 | 1056 | nand_update_bbt(mtd, (loff_t)(block - 2) << (this->bbt_erase_shift - 1)); |
1da177e4 LT |
1057 | } |
1058 | } | |
1059 | ||
7cba7b14 SAS |
1060 | /** |
1061 | * verify_bbt_descr - verify the bad block description | |
8b6e50c9 BN |
1062 | * @mtd: MTD device structure |
1063 | * @bd: the table to verify | |
7cba7b14 SAS |
1064 | * |
1065 | * This functions performs a few sanity checks on the bad block description | |
1066 | * table. | |
1067 | */ | |
1068 | static void verify_bbt_descr(struct mtd_info *mtd, struct nand_bbt_descr *bd) | |
1069 | { | |
1070 | struct nand_chip *this = mtd->priv; | |
7912a5e7 SF |
1071 | u32 pattern_len; |
1072 | u32 bits; | |
7cba7b14 SAS |
1073 | u32 table_size; |
1074 | ||
1075 | if (!bd) | |
1076 | return; | |
7912a5e7 SF |
1077 | |
1078 | pattern_len = bd->len; | |
1079 | bits = bd->options & NAND_BBT_NRBITS_MSK; | |
1080 | ||
a40f7341 | 1081 | BUG_ON((this->bbt_options & NAND_BBT_NO_OOB) && |
bb9ebd4e | 1082 | !(this->bbt_options & NAND_BBT_USE_FLASH)); |
7cba7b14 SAS |
1083 | BUG_ON(!bits); |
1084 | ||
1085 | if (bd->options & NAND_BBT_VERSION) | |
1086 | pattern_len++; | |
1087 | ||
1088 | if (bd->options & NAND_BBT_NO_OOB) { | |
bb9ebd4e | 1089 | BUG_ON(!(this->bbt_options & NAND_BBT_USE_FLASH)); |
a40f7341 | 1090 | BUG_ON(!(this->bbt_options & NAND_BBT_NO_OOB)); |
7cba7b14 SAS |
1091 | BUG_ON(bd->offs); |
1092 | if (bd->options & NAND_BBT_VERSION) | |
1093 | BUG_ON(bd->veroffs != bd->len); | |
1094 | BUG_ON(bd->options & NAND_BBT_SAVECONTENT); | |
1095 | } | |
1096 | ||
1097 | if (bd->options & NAND_BBT_PERCHIP) | |
1098 | table_size = this->chipsize >> this->bbt_erase_shift; | |
1099 | else | |
1100 | table_size = mtd->size >> this->bbt_erase_shift; | |
1101 | table_size >>= 3; | |
1102 | table_size *= bits; | |
1103 | if (bd->options & NAND_BBT_NO_OOB) | |
1104 | table_size += pattern_len; | |
1105 | BUG_ON(table_size > (1 << this->bbt_erase_shift)); | |
1106 | } | |
1107 | ||
1da177e4 LT |
1108 | /** |
1109 | * nand_scan_bbt - [NAND Interface] scan, find, read and maybe create bad block table(s) | |
8b6e50c9 BN |
1110 | * @mtd: MTD device structure |
1111 | * @bd: descriptor for the good/bad block search pattern | |
1da177e4 | 1112 | * |
8b6e50c9 BN |
1113 | * The function checks, if a bad block table(s) is/are already available. If |
1114 | * not it scans the device for manufacturer marked good / bad blocks and writes | |
1115 | * the bad block table(s) to the selected place. | |
1da177e4 | 1116 | * |
8b6e50c9 BN |
1117 | * The bad block table memory is allocated here. It must be freed by calling |
1118 | * the nand_free_bbt function. | |
1119 | */ | |
e0c7d767 | 1120 | int nand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd) |
1da177e4 LT |
1121 | { |
1122 | struct nand_chip *this = mtd->priv; | |
1123 | int len, res = 0; | |
1124 | uint8_t *buf; | |
1125 | struct nand_bbt_descr *td = this->bbt_td; | |
1126 | struct nand_bbt_descr *md = this->bbt_md; | |
1127 | ||
1128 | len = mtd->size >> (this->bbt_erase_shift + 2); | |
8b6e50c9 BN |
1129 | /* |
1130 | * Allocate memory (2bit per block) and clear the memory bad block | |
1131 | * table. | |
1132 | */ | |
95b93a0c | 1133 | this->bbt = kzalloc(len, GFP_KERNEL); |
0870066d | 1134 | if (!this->bbt) |
1da177e4 | 1135 | return -ENOMEM; |
1da177e4 | 1136 | |
8b6e50c9 BN |
1137 | /* |
1138 | * If no primary table decriptor is given, scan the device to build a | |
1139 | * memory based bad block table. | |
1da177e4 | 1140 | */ |
eeada24d AB |
1141 | if (!td) { |
1142 | if ((res = nand_memory_bbt(mtd, bd))) { | |
d0370219 | 1143 | pr_err("nand_bbt: can't scan flash and build the RAM-based BBT\n"); |
e0c7d767 | 1144 | kfree(this->bbt); |
eeada24d AB |
1145 | this->bbt = NULL; |
1146 | } | |
1147 | return res; | |
1148 | } | |
7cba7b14 SAS |
1149 | verify_bbt_descr(mtd, td); |
1150 | verify_bbt_descr(mtd, md); | |
1da177e4 LT |
1151 | |
1152 | /* Allocate a temporary buffer for one eraseblock incl. oob */ | |
1153 | len = (1 << this->bbt_erase_shift); | |
1154 | len += (len >> this->page_shift) * mtd->oobsize; | |
c3f8abf4 | 1155 | buf = vmalloc(len); |
1da177e4 | 1156 | if (!buf) { |
e0c7d767 | 1157 | kfree(this->bbt); |
1da177e4 LT |
1158 | this->bbt = NULL; |
1159 | return -ENOMEM; | |
1160 | } | |
61b03bd7 | 1161 | |
8b6e50c9 | 1162 | /* Is the bbt at a given page? */ |
1da177e4 | 1163 | if (td->options & NAND_BBT_ABSPAGE) { |
e0c7d767 | 1164 | res = read_abs_bbts(mtd, buf, td, md); |
61b03bd7 | 1165 | } else { |
1da177e4 | 1166 | /* Search the bad block table using a pattern in oob */ |
e0c7d767 | 1167 | res = search_read_bbts(mtd, buf, td, md); |
61b03bd7 | 1168 | } |
1da177e4 | 1169 | |
61b03bd7 | 1170 | if (res) |
e0c7d767 | 1171 | res = check_create(mtd, buf, bd); |
61b03bd7 | 1172 | |
1da177e4 | 1173 | /* Prevent the bbt regions from erasing / writing */ |
e0c7d767 | 1174 | mark_bbt_region(mtd, td); |
1da177e4 | 1175 | if (md) |
e0c7d767 | 1176 | mark_bbt_region(mtd, md); |
61b03bd7 | 1177 | |
e0c7d767 | 1178 | vfree(buf); |
1da177e4 LT |
1179 | return res; |
1180 | } | |
1181 | ||
1da177e4 | 1182 | /** |
61b03bd7 | 1183 | * nand_update_bbt - [NAND Interface] update bad block table(s) |
8b6e50c9 BN |
1184 | * @mtd: MTD device structure |
1185 | * @offs: the offset of the newly marked block | |
1da177e4 | 1186 | * |
8b6e50c9 BN |
1187 | * The function updates the bad block table(s). |
1188 | */ | |
e0c7d767 | 1189 | int nand_update_bbt(struct mtd_info *mtd, loff_t offs) |
1da177e4 LT |
1190 | { |
1191 | struct nand_chip *this = mtd->priv; | |
1196ac5a | 1192 | int len, res = 0; |
1da177e4 LT |
1193 | int chip, chipsel; |
1194 | uint8_t *buf; | |
1195 | struct nand_bbt_descr *td = this->bbt_td; | |
1196 | struct nand_bbt_descr *md = this->bbt_md; | |
1197 | ||
1198 | if (!this->bbt || !td) | |
1199 | return -EINVAL; | |
1200 | ||
1da177e4 LT |
1201 | /* Allocate a temporary buffer for one eraseblock incl. oob */ |
1202 | len = (1 << this->bbt_erase_shift); | |
1203 | len += (len >> this->page_shift) * mtd->oobsize; | |
e0c7d767 | 1204 | buf = kmalloc(len, GFP_KERNEL); |
0870066d | 1205 | if (!buf) |
1da177e4 | 1206 | return -ENOMEM; |
1da177e4 | 1207 | |
8b6e50c9 | 1208 | /* Do we have a bbt per chip? */ |
1da177e4 | 1209 | if (td->options & NAND_BBT_PERCHIP) { |
e0c7d767 | 1210 | chip = (int)(offs >> this->chip_shift); |
1da177e4 LT |
1211 | chipsel = chip; |
1212 | } else { | |
1213 | chip = 0; | |
1214 | chipsel = -1; | |
1215 | } | |
1216 | ||
1217 | td->version[chip]++; | |
1218 | if (md) | |
61b03bd7 | 1219 | md->version[chip]++; |
1da177e4 | 1220 | |
8b6e50c9 | 1221 | /* Write the bad block table to the device? */ |
1196ac5a | 1222 | if (td->options & NAND_BBT_WRITE) { |
e0c7d767 | 1223 | res = write_bbt(mtd, buf, td, md, chipsel); |
1da177e4 LT |
1224 | if (res < 0) |
1225 | goto out; | |
1226 | } | |
8b6e50c9 | 1227 | /* Write the mirror bad block table to the device? */ |
1196ac5a | 1228 | if (md && (md->options & NAND_BBT_WRITE)) { |
e0c7d767 | 1229 | res = write_bbt(mtd, buf, md, td, chipsel); |
1da177e4 LT |
1230 | } |
1231 | ||
e0c7d767 DW |
1232 | out: |
1233 | kfree(buf); | |
1da177e4 LT |
1234 | return res; |
1235 | } | |
1236 | ||
8b6e50c9 BN |
1237 | /* |
1238 | * Define some generic bad / good block scan pattern which are used | |
1239 | * while scanning a device for factory marked good / bad blocks. | |
1240 | */ | |
1da177e4 LT |
1241 | static uint8_t scan_ff_pattern[] = { 0xff, 0xff }; |
1242 | ||
1da177e4 LT |
1243 | static uint8_t scan_agand_pattern[] = { 0x1C, 0x71, 0xC7, 0x1C, 0x71, 0xC7 }; |
1244 | ||
1245 | static struct nand_bbt_descr agand_flashbased = { | |
1246 | .options = NAND_BBT_SCANEMPTY | NAND_BBT_SCANALLPAGES, | |
1247 | .offs = 0x20, | |
1248 | .len = 6, | |
1249 | .pattern = scan_agand_pattern | |
1250 | }; | |
1251 | ||
7854d3f7 | 1252 | /* Generic flash bbt descriptors */ |
1da177e4 LT |
1253 | static uint8_t bbt_pattern[] = {'B', 'b', 't', '0' }; |
1254 | static uint8_t mirror_pattern[] = {'1', 't', 'b', 'B' }; | |
1255 | ||
1256 | static struct nand_bbt_descr bbt_main_descr = { | |
61b03bd7 | 1257 | .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
1da177e4 LT |
1258 | | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP, |
1259 | .offs = 8, | |
1260 | .len = 4, | |
1261 | .veroffs = 12, | |
1262 | .maxblocks = 4, | |
1263 | .pattern = bbt_pattern | |
1264 | }; | |
1265 | ||
1266 | static struct nand_bbt_descr bbt_mirror_descr = { | |
61b03bd7 | 1267 | .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
1da177e4 LT |
1268 | | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP, |
1269 | .offs = 8, | |
1270 | .len = 4, | |
1271 | .veroffs = 12, | |
1272 | .maxblocks = 4, | |
1273 | .pattern = mirror_pattern | |
1274 | }; | |
1275 | ||
7cba7b14 SAS |
1276 | static struct nand_bbt_descr bbt_main_no_bbt_descr = { |
1277 | .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE | |
1278 | | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP | |
1279 | | NAND_BBT_NO_OOB, | |
1280 | .len = 4, | |
1281 | .veroffs = 4, | |
1282 | .maxblocks = 4, | |
1283 | .pattern = bbt_pattern | |
1284 | }; | |
1285 | ||
1286 | static struct nand_bbt_descr bbt_mirror_no_bbt_descr = { | |
1287 | .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE | |
1288 | | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP | |
1289 | | NAND_BBT_NO_OOB, | |
1290 | .len = 4, | |
1291 | .veroffs = 4, | |
1292 | .maxblocks = 4, | |
1293 | .pattern = mirror_pattern | |
1294 | }; | |
1295 | ||
752ed6c5 | 1296 | #define BADBLOCK_SCAN_MASK (~NAND_BBT_NO_OOB) |
58373ff0 | 1297 | /** |
752ed6c5 | 1298 | * nand_create_badblock_pattern - [INTERN] Creates a BBT descriptor structure |
8b6e50c9 | 1299 | * @this: NAND chip to create descriptor for |
58373ff0 BN |
1300 | * |
1301 | * This function allocates and initializes a nand_bbt_descr for BBM detection | |
752ed6c5 | 1302 | * based on the properties of @this. The new descriptor is stored in |
58373ff0 BN |
1303 | * this->badblock_pattern. Thus, this->badblock_pattern should be NULL when |
1304 | * passed to this function. | |
58373ff0 | 1305 | */ |
752ed6c5 | 1306 | static int nand_create_badblock_pattern(struct nand_chip *this) |
58373ff0 BN |
1307 | { |
1308 | struct nand_bbt_descr *bd; | |
1309 | if (this->badblock_pattern) { | |
752ed6c5 | 1310 | pr_warn("Bad block pattern already allocated; not replacing\n"); |
58373ff0 BN |
1311 | return -EINVAL; |
1312 | } | |
1313 | bd = kzalloc(sizeof(*bd), GFP_KERNEL); | |
0870066d | 1314 | if (!bd) |
58373ff0 | 1315 | return -ENOMEM; |
752ed6c5 | 1316 | bd->options = this->bbt_options & BADBLOCK_SCAN_MASK; |
58373ff0 BN |
1317 | bd->offs = this->badblockpos; |
1318 | bd->len = (this->options & NAND_BUSWIDTH_16) ? 2 : 1; | |
1319 | bd->pattern = scan_ff_pattern; | |
1320 | bd->options |= NAND_BBT_DYNAMICSTRUCT; | |
1321 | this->badblock_pattern = bd; | |
1322 | return 0; | |
1323 | } | |
1324 | ||
1da177e4 | 1325 | /** |
61b03bd7 | 1326 | * nand_default_bbt - [NAND Interface] Select a default bad block table for the device |
8b6e50c9 | 1327 | * @mtd: MTD device structure |
1da177e4 | 1328 | * |
8b6e50c9 BN |
1329 | * This function selects the default bad block table support for the device and |
1330 | * calls the nand_scan_bbt function. | |
1331 | */ | |
e0c7d767 | 1332 | int nand_default_bbt(struct mtd_info *mtd) |
1da177e4 LT |
1333 | { |
1334 | struct nand_chip *this = mtd->priv; | |
61b03bd7 | 1335 | |
8b6e50c9 BN |
1336 | /* |
1337 | * Default for AG-AND. We must use a flash based bad block table as the | |
1338 | * devices have factory marked _good_ blocks. Erasing those blocks | |
1339 | * leads to loss of the good / bad information, so we _must_ store this | |
1340 | * information in a good / bad table during startup. | |
e0c7d767 | 1341 | */ |
1da177e4 LT |
1342 | if (this->options & NAND_IS_AND) { |
1343 | /* Use the default pattern descriptors */ | |
61b03bd7 | 1344 | if (!this->bbt_td) { |
1da177e4 LT |
1345 | this->bbt_td = &bbt_main_descr; |
1346 | this->bbt_md = &bbt_mirror_descr; | |
61b03bd7 | 1347 | } |
bb9ebd4e | 1348 | this->bbt_options |= NAND_BBT_USE_FLASH; |
e0c7d767 | 1349 | return nand_scan_bbt(mtd, &agand_flashbased); |
1da177e4 | 1350 | } |
61b03bd7 | 1351 | |
8b6e50c9 | 1352 | /* Is a flash based bad block table requested? */ |
bb9ebd4e | 1353 | if (this->bbt_options & NAND_BBT_USE_FLASH) { |
61b03bd7 TG |
1354 | /* Use the default pattern descriptors */ |
1355 | if (!this->bbt_td) { | |
a40f7341 | 1356 | if (this->bbt_options & NAND_BBT_NO_OOB) { |
7cba7b14 SAS |
1357 | this->bbt_td = &bbt_main_no_bbt_descr; |
1358 | this->bbt_md = &bbt_mirror_no_bbt_descr; | |
1359 | } else { | |
1360 | this->bbt_td = &bbt_main_descr; | |
1361 | this->bbt_md = &bbt_mirror_descr; | |
1362 | } | |
1da177e4 | 1363 | } |
1da177e4 LT |
1364 | } else { |
1365 | this->bbt_td = NULL; | |
1366 | this->bbt_md = NULL; | |
1da177e4 | 1367 | } |
a2f812df BN |
1368 | |
1369 | if (!this->badblock_pattern) | |
752ed6c5 | 1370 | nand_create_badblock_pattern(this); |
a2f812df | 1371 | |
e0c7d767 | 1372 | return nand_scan_bbt(mtd, this->badblock_pattern); |
1da177e4 LT |
1373 | } |
1374 | ||
1375 | /** | |
61b03bd7 | 1376 | * nand_isbad_bbt - [NAND Interface] Check if a block is bad |
8b6e50c9 BN |
1377 | * @mtd: MTD device structure |
1378 | * @offs: offset in the device | |
1379 | * @allowbbt: allow access to bad block table region | |
1380 | */ | |
e0c7d767 | 1381 | int nand_isbad_bbt(struct mtd_info *mtd, loff_t offs, int allowbbt) |
1da177e4 LT |
1382 | { |
1383 | struct nand_chip *this = mtd->priv; | |
1384 | int block; | |
e0c7d767 | 1385 | uint8_t res; |
61b03bd7 | 1386 | |
1da177e4 | 1387 | /* Get block number * 2 */ |
e0c7d767 | 1388 | block = (int)(offs >> (this->bbt_erase_shift - 1)); |
1da177e4 LT |
1389 | res = (this->bbt[block >> 3] >> (block & 0x06)) & 0x03; |
1390 | ||
289c0522 BN |
1391 | pr_debug("nand_isbad_bbt(): bbt info for offs 0x%08x: " |
1392 | "(block %d) 0x%02x\n", | |
1393 | (unsigned int)offs, block >> 1, res); | |
1da177e4 LT |
1394 | |
1395 | switch ((int)res) { | |
e0c7d767 DW |
1396 | case 0x00: |
1397 | return 0; | |
1398 | case 0x01: | |
1399 | return 1; | |
1400 | case 0x02: | |
1401 | return allowbbt ? 0 : 1; | |
1da177e4 LT |
1402 | } |
1403 | return 1; | |
1404 | } | |
1405 | ||
e0c7d767 DW |
1406 | EXPORT_SYMBOL(nand_scan_bbt); |
1407 | EXPORT_SYMBOL(nand_default_bbt); |