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27 | * If one of the BBTs is out of date or does not exist it is (re)created.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 | { | |
718894ad BN |
74 | if (memcmp(buf, td->pattern, td->len)) |
75 | return -1; | |
76 | return 0; | |
7cba7b14 SAS |
77 | } |
78 | ||
61b03bd7 | 79 | /** |
1da177e4 | 80 | * check_pattern - [GENERIC] check if a pattern is in the buffer |
8b6e50c9 BN |
81 | * @buf: the buffer to search |
82 | * @len: the length of buffer to search | |
83 | * @paglen: the pagelength | |
84 | * @td: search pattern descriptor | |
1da177e4 | 85 | * |
8b6e50c9 BN |
86 | * Check for a pattern at the given place. Used to search bad block tables and |
87 | * good / bad block identifiers. If the SCAN_EMPTY option is set then check, if | |
88 | * all bytes except the pattern area contain 0xff. | |
89 | */ | |
e0c7d767 | 90 | static int check_pattern(uint8_t *buf, int len, int paglen, struct nand_bbt_descr *td) |
1da177e4 | 91 | { |
171650af | 92 | int i, end = 0; |
1da177e4 LT |
93 | uint8_t *p = buf; |
94 | ||
7cba7b14 SAS |
95 | if (td->options & NAND_BBT_NO_OOB) |
96 | return check_pattern_no_oob(buf, td); | |
97 | ||
c9e05365 | 98 | end = paglen + td->offs; |
1da177e4 LT |
99 | if (td->options & NAND_BBT_SCANEMPTY) { |
100 | for (i = 0; i < end; i++) { | |
101 | if (p[i] != 0xff) | |
102 | return -1; | |
103 | } | |
61b03bd7 | 104 | } |
c9e05365 | 105 | p += end; |
61b03bd7 | 106 | |
1da177e4 | 107 | /* Compare the pattern */ |
75b66d8c BN |
108 | if (memcmp(p, td->pattern, td->len)) |
109 | return -1; | |
58373ff0 | 110 | |
1da177e4 | 111 | if (td->options & NAND_BBT_SCANEMPTY) { |
171650af AB |
112 | p += td->len; |
113 | end += td->len; | |
1da177e4 LT |
114 | for (i = end; i < len; i++) { |
115 | if (*p++ != 0xff) | |
116 | return -1; | |
117 | } | |
118 | } | |
119 | return 0; | |
120 | } | |
121 | ||
61b03bd7 | 122 | /** |
c9e05365 | 123 | * check_short_pattern - [GENERIC] check if a pattern is in the buffer |
8b6e50c9 BN |
124 | * @buf: the buffer to search |
125 | * @td: search pattern descriptor | |
c9e05365 | 126 | * |
8b6e50c9 BN |
127 | * Check for a pattern at the given place. Used to search bad block tables and |
128 | * good / bad block identifiers. Same as check_pattern, but no optional empty | |
129 | * check. | |
130 | */ | |
e0c7d767 | 131 | static int check_short_pattern(uint8_t *buf, struct nand_bbt_descr *td) |
c9e05365 TG |
132 | { |
133 | int i; | |
134 | uint8_t *p = buf; | |
135 | ||
136 | /* Compare the pattern */ | |
137 | for (i = 0; i < td->len; i++) { | |
19870da7 | 138 | if (p[td->offs + i] != td->pattern[i]) |
c9e05365 TG |
139 | return -1; |
140 | } | |
141 | return 0; | |
142 | } | |
143 | ||
7cba7b14 SAS |
144 | /** |
145 | * add_marker_len - compute the length of the marker in data area | |
8b6e50c9 | 146 | * @td: BBT descriptor used for computation |
7cba7b14 | 147 | * |
7854d3f7 | 148 | * The length will be 0 if the marker is located in OOB area. |
7cba7b14 SAS |
149 | */ |
150 | static u32 add_marker_len(struct nand_bbt_descr *td) | |
151 | { | |
152 | u32 len; | |
153 | ||
154 | if (!(td->options & NAND_BBT_NO_OOB)) | |
155 | return 0; | |
156 | ||
157 | len = td->len; | |
158 | if (td->options & NAND_BBT_VERSION) | |
159 | len++; | |
160 | return len; | |
161 | } | |
162 | ||
1da177e4 LT |
163 | /** |
164 | * read_bbt - [GENERIC] Read the bad block table starting from page | |
8b6e50c9 BN |
165 | * @mtd: MTD device structure |
166 | * @buf: temporary buffer | |
167 | * @page: the starting page | |
168 | * @num: the number of bbt descriptors to read | |
7854d3f7 | 169 | * @td: the bbt describtion table |
8b6e50c9 | 170 | * @offs: offset in the memory table |
1da177e4 LT |
171 | * |
172 | * Read the bad block table starting from page. | |
1da177e4 | 173 | */ |
e0c7d767 | 174 | static int read_bbt(struct mtd_info *mtd, uint8_t *buf, int page, int num, |
df5b4e34 | 175 | struct nand_bbt_descr *td, int offs) |
1da177e4 | 176 | { |
167a8d52 | 177 | int res, ret = 0, i, j, act = 0; |
1da177e4 LT |
178 | struct nand_chip *this = mtd->priv; |
179 | size_t retlen, len, totlen; | |
180 | loff_t from; | |
df5b4e34 | 181 | int bits = td->options & NAND_BBT_NRBITS_MSK; |
596d7452 | 182 | uint8_t msk = (uint8_t)((1 << bits) - 1); |
7cba7b14 | 183 | u32 marker_len; |
df5b4e34 | 184 | int reserved_block_code = td->reserved_block_code; |
1da177e4 LT |
185 | |
186 | totlen = (num * bits) >> 3; | |
7cba7b14 | 187 | marker_len = add_marker_len(td); |
596d7452 | 188 | from = ((loff_t)page) << this->page_shift; |
61b03bd7 | 189 | |
1da177e4 | 190 | while (totlen) { |
596d7452 | 191 | len = min(totlen, (size_t)(1 << this->bbt_erase_shift)); |
7cba7b14 SAS |
192 | if (marker_len) { |
193 | /* | |
194 | * In case the BBT marker is not in the OOB area it | |
195 | * will be just in the first page. | |
196 | */ | |
197 | len -= marker_len; | |
198 | from += marker_len; | |
199 | marker_len = 0; | |
200 | } | |
329ad399 | 201 | res = mtd_read(mtd, from, len, &retlen, buf); |
1da177e4 | 202 | if (res < 0) { |
167a8d52 BN |
203 | if (mtd_is_eccerr(res)) { |
204 | pr_info("nand_bbt: ECC error in BBT at " | |
205 | "0x%012llx\n", from & ~mtd->writesize); | |
206 | return res; | |
207 | } else if (mtd_is_bitflip(res)) { | |
208 | pr_info("nand_bbt: corrected error in BBT at " | |
209 | "0x%012llx\n", from & ~mtd->writesize); | |
210 | ret = res; | |
211 | } else { | |
212 | pr_info("nand_bbt: error reading BBT\n"); | |
1da177e4 LT |
213 | return res; |
214 | } | |
61b03bd7 | 215 | } |
1da177e4 LT |
216 | |
217 | /* Analyse data */ | |
218 | for (i = 0; i < len; i++) { | |
219 | uint8_t dat = buf[i]; | |
220 | for (j = 0; j < 8; j += bits, act += 2) { | |
221 | uint8_t tmp = (dat >> j) & msk; | |
222 | if (tmp == msk) | |
223 | continue; | |
e0c7d767 | 224 | if (reserved_block_code && (tmp == reserved_block_code)) { |
d0370219 BN |
225 | pr_info("nand_read_bbt: reserved block at 0x%012llx\n", |
226 | (loff_t)((offs << 2) + (act >> 1)) << this->bbt_erase_shift); | |
1da177e4 | 227 | this->bbt[offs + (act >> 3)] |= 0x2 << (act & 0x06); |
f1a28c02 | 228 | mtd->ecc_stats.bbtblocks++; |
1da177e4 LT |
229 | continue; |
230 | } | |
8b6e50c9 BN |
231 | /* |
232 | * Leave it for now, if it's matured we can | |
a0f5080e | 233 | * move this message to pr_debug. |
8b6e50c9 | 234 | */ |
d0370219 BN |
235 | pr_info("nand_read_bbt: bad block at 0x%012llx\n", |
236 | (loff_t)((offs << 2) + (act >> 1)) << this->bbt_erase_shift); | |
8b6e50c9 | 237 | /* Factory marked bad or worn out? */ |
1da177e4 LT |
238 | if (tmp == 0) |
239 | this->bbt[offs + (act >> 3)] |= 0x3 << (act & 0x06); | |
240 | else | |
241 | this->bbt[offs + (act >> 3)] |= 0x1 << (act & 0x06); | |
f1a28c02 | 242 | mtd->ecc_stats.badblocks++; |
61b03bd7 | 243 | } |
1da177e4 LT |
244 | } |
245 | totlen -= len; | |
246 | from += len; | |
247 | } | |
167a8d52 | 248 | return ret; |
1da177e4 LT |
249 | } |
250 | ||
251 | /** | |
252 | * read_abs_bbt - [GENERIC] Read the bad block table starting at a given page | |
8b6e50c9 BN |
253 | * @mtd: MTD device structure |
254 | * @buf: temporary buffer | |
255 | * @td: descriptor for the bad block table | |
596d7452 | 256 | * @chip: read the table for a specific chip, -1 read all chips; applies only if |
8b6e50c9 | 257 | * NAND_BBT_PERCHIP option is set |
1da177e4 | 258 | * |
8b6e50c9 BN |
259 | * Read the bad block table for all chips starting at a given page. We assume |
260 | * that the bbt bits are in consecutive order. | |
261 | */ | |
e0c7d767 | 262 | static int read_abs_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td, int chip) |
1da177e4 LT |
263 | { |
264 | struct nand_chip *this = mtd->priv; | |
265 | int res = 0, i; | |
1da177e4 | 266 | |
1da177e4 LT |
267 | if (td->options & NAND_BBT_PERCHIP) { |
268 | int offs = 0; | |
269 | for (i = 0; i < this->numchips; i++) { | |
270 | if (chip == -1 || chip == i) | |
df5b4e34 SAS |
271 | res = read_bbt(mtd, buf, td->pages[i], |
272 | this->chipsize >> this->bbt_erase_shift, | |
273 | td, offs); | |
1da177e4 LT |
274 | if (res) |
275 | return res; | |
276 | offs += this->chipsize >> (this->bbt_erase_shift + 2); | |
277 | } | |
278 | } else { | |
df5b4e34 SAS |
279 | res = read_bbt(mtd, buf, td->pages[0], |
280 | mtd->size >> this->bbt_erase_shift, td, 0); | |
1da177e4 LT |
281 | if (res) |
282 | return res; | |
283 | } | |
284 | return 0; | |
285 | } | |
286 | ||
8b6e50c9 | 287 | /* BBT marker is in the first page, no OOB */ |
7cba7b14 SAS |
288 | static int scan_read_raw_data(struct mtd_info *mtd, uint8_t *buf, loff_t offs, |
289 | struct nand_bbt_descr *td) | |
290 | { | |
291 | size_t retlen; | |
292 | size_t len; | |
293 | ||
294 | len = td->len; | |
295 | if (td->options & NAND_BBT_VERSION) | |
296 | len++; | |
297 | ||
329ad399 | 298 | return mtd_read(mtd, offs, len, &retlen, buf); |
7cba7b14 SAS |
299 | } |
300 | ||
8b6e50c9 | 301 | /* Scan read raw data from flash */ |
7cba7b14 | 302 | static int scan_read_raw_oob(struct mtd_info *mtd, uint8_t *buf, loff_t offs, |
8593fbc6 TG |
303 | size_t len) |
304 | { | |
305 | struct mtd_oob_ops ops; | |
b64d39d8 | 306 | int res; |
8593fbc6 | 307 | |
0612b9dd | 308 | ops.mode = MTD_OPS_RAW; |
8593fbc6 TG |
309 | ops.ooboffs = 0; |
310 | ops.ooblen = mtd->oobsize; | |
8593fbc6 | 311 | |
b64d39d8 | 312 | while (len > 0) { |
105513cc BN |
313 | ops.datbuf = buf; |
314 | ops.len = min(len, (size_t)mtd->writesize); | |
315 | ops.oobbuf = buf + ops.len; | |
b64d39d8 | 316 | |
fd2819bb | 317 | res = mtd_read_oob(mtd, offs, &ops); |
b64d39d8 | 318 | |
afa17de2 | 319 | if (res) |
105513cc | 320 | return res; |
b64d39d8 ML |
321 | |
322 | buf += mtd->oobsize + mtd->writesize; | |
323 | len -= mtd->writesize; | |
34a5704d | 324 | offs += mtd->writesize; |
b64d39d8 ML |
325 | } |
326 | return 0; | |
8593fbc6 TG |
327 | } |
328 | ||
7cba7b14 SAS |
329 | static int scan_read_raw(struct mtd_info *mtd, uint8_t *buf, loff_t offs, |
330 | size_t len, struct nand_bbt_descr *td) | |
331 | { | |
332 | if (td->options & NAND_BBT_NO_OOB) | |
333 | return scan_read_raw_data(mtd, buf, offs, td); | |
334 | else | |
335 | return scan_read_raw_oob(mtd, buf, offs, len); | |
336 | } | |
337 | ||
8b6e50c9 | 338 | /* Scan write data with oob to flash */ |
8593fbc6 TG |
339 | static int scan_write_bbt(struct mtd_info *mtd, loff_t offs, size_t len, |
340 | uint8_t *buf, uint8_t *oob) | |
341 | { | |
342 | struct mtd_oob_ops ops; | |
343 | ||
0612b9dd | 344 | ops.mode = MTD_OPS_PLACE_OOB; |
8593fbc6 TG |
345 | ops.ooboffs = 0; |
346 | ops.ooblen = mtd->oobsize; | |
347 | ops.datbuf = buf; | |
348 | ops.oobbuf = oob; | |
349 | ops.len = len; | |
350 | ||
a2cc5ba0 | 351 | return mtd_write_oob(mtd, offs, &ops); |
8593fbc6 TG |
352 | } |
353 | ||
7cba7b14 SAS |
354 | static u32 bbt_get_ver_offs(struct mtd_info *mtd, struct nand_bbt_descr *td) |
355 | { | |
356 | u32 ver_offs = td->veroffs; | |
357 | ||
358 | if (!(td->options & NAND_BBT_NO_OOB)) | |
359 | ver_offs += mtd->writesize; | |
360 | return ver_offs; | |
361 | } | |
362 | ||
1da177e4 LT |
363 | /** |
364 | * read_abs_bbts - [GENERIC] Read the bad block table(s) for all chips starting at a given page | |
8b6e50c9 BN |
365 | * @mtd: MTD device structure |
366 | * @buf: temporary buffer | |
367 | * @td: descriptor for the bad block table | |
368 | * @md: descriptor for the bad block table mirror | |
1da177e4 | 369 | * |
8b6e50c9 BN |
370 | * Read the bad block table(s) for all chips starting at a given page. We |
371 | * assume that the bbt bits are in consecutive order. | |
372 | */ | |
8593fbc6 TG |
373 | static int read_abs_bbts(struct mtd_info *mtd, uint8_t *buf, |
374 | struct nand_bbt_descr *td, struct nand_bbt_descr *md) | |
1da177e4 LT |
375 | { |
376 | struct nand_chip *this = mtd->priv; | |
377 | ||
61b03bd7 | 378 | /* Read the primary version, if available */ |
1da177e4 | 379 | if (td->options & NAND_BBT_VERSION) { |
69423d99 | 380 | scan_read_raw(mtd, buf, (loff_t)td->pages[0] << this->page_shift, |
7cba7b14 SAS |
381 | mtd->writesize, td); |
382 | td->version[0] = buf[bbt_get_ver_offs(mtd, td)]; | |
9a4d4d69 | 383 | pr_info("Bad block table at page %d, version 0x%02X\n", |
d0370219 | 384 | td->pages[0], td->version[0]); |
1da177e4 LT |
385 | } |
386 | ||
61b03bd7 | 387 | /* Read the mirror version, if available */ |
1da177e4 | 388 | if (md && (md->options & NAND_BBT_VERSION)) { |
69423d99 | 389 | scan_read_raw(mtd, buf, (loff_t)md->pages[0] << this->page_shift, |
7bb9c754 | 390 | mtd->writesize, md); |
7cba7b14 | 391 | md->version[0] = buf[bbt_get_ver_offs(mtd, md)]; |
9a4d4d69 | 392 | pr_info("Bad block table at page %d, version 0x%02X\n", |
d0370219 | 393 | md->pages[0], md->version[0]); |
1da177e4 | 394 | } |
1da177e4 LT |
395 | return 1; |
396 | } | |
397 | ||
8b6e50c9 | 398 | /* Scan a given block full */ |
8593fbc6 TG |
399 | static int scan_block_full(struct mtd_info *mtd, struct nand_bbt_descr *bd, |
400 | loff_t offs, uint8_t *buf, size_t readlen, | |
401 | int scanlen, int len) | |
402 | { | |
403 | int ret, j; | |
404 | ||
7cba7b14 | 405 | ret = scan_read_raw_oob(mtd, buf, offs, readlen); |
afa17de2 | 406 | /* Ignore ECC errors when checking for BBM */ |
d57f4054 | 407 | if (ret && !mtd_is_bitflip_or_eccerr(ret)) |
8593fbc6 TG |
408 | return ret; |
409 | ||
410 | for (j = 0; j < len; j++, buf += scanlen) { | |
411 | if (check_pattern(buf, scanlen, mtd->writesize, bd)) | |
412 | return 1; | |
413 | } | |
414 | return 0; | |
415 | } | |
416 | ||
8b6e50c9 | 417 | /* Scan a given block partially */ |
8593fbc6 TG |
418 | static int scan_block_fast(struct mtd_info *mtd, struct nand_bbt_descr *bd, |
419 | loff_t offs, uint8_t *buf, int len) | |
420 | { | |
421 | struct mtd_oob_ops ops; | |
422 | int j, ret; | |
423 | ||
8593fbc6 TG |
424 | ops.ooblen = mtd->oobsize; |
425 | ops.oobbuf = buf; | |
426 | ops.ooboffs = 0; | |
427 | ops.datbuf = NULL; | |
0612b9dd | 428 | ops.mode = MTD_OPS_PLACE_OOB; |
8593fbc6 TG |
429 | |
430 | for (j = 0; j < len; j++) { | |
431 | /* | |
8b6e50c9 BN |
432 | * Read the full oob until read_oob is fixed to handle single |
433 | * byte reads for 16 bit buswidth. | |
8593fbc6 | 434 | */ |
fd2819bb | 435 | ret = mtd_read_oob(mtd, offs, &ops); |
903cd06c | 436 | /* Ignore ECC errors when checking for BBM */ |
d57f4054 | 437 | if (ret && !mtd_is_bitflip_or_eccerr(ret)) |
8593fbc6 TG |
438 | return ret; |
439 | ||
440 | if (check_short_pattern(buf, bd)) | |
441 | return 1; | |
442 | ||
443 | offs += mtd->writesize; | |
444 | } | |
445 | return 0; | |
446 | } | |
447 | ||
1da177e4 LT |
448 | /** |
449 | * create_bbt - [GENERIC] Create a bad block table by scanning the device | |
8b6e50c9 BN |
450 | * @mtd: MTD device structure |
451 | * @buf: temporary buffer | |
452 | * @bd: descriptor for the good/bad block search pattern | |
453 | * @chip: create the table for a specific chip, -1 read all chips; applies only | |
454 | * if NAND_BBT_PERCHIP option is set | |
1da177e4 | 455 | * |
8b6e50c9 BN |
456 | * Create a bad block table by scanning the device for the given good/bad block |
457 | * identify pattern. | |
1da177e4 | 458 | */ |
8593fbc6 TG |
459 | static int create_bbt(struct mtd_info *mtd, uint8_t *buf, |
460 | struct nand_bbt_descr *bd, int chip) | |
1da177e4 LT |
461 | { |
462 | struct nand_chip *this = mtd->priv; | |
8593fbc6 | 463 | int i, numblocks, len, scanlen; |
1da177e4 LT |
464 | int startblock; |
465 | loff_t from; | |
8593fbc6 | 466 | size_t readlen; |
1da177e4 | 467 | |
9a4d4d69 | 468 | pr_info("Scanning device for bad blocks\n"); |
1da177e4 LT |
469 | |
470 | if (bd->options & NAND_BBT_SCANALLPAGES) | |
471 | len = 1 << (this->bbt_erase_shift - this->page_shift); | |
58373ff0 BN |
472 | else if (bd->options & NAND_BBT_SCAN2NDPAGE) |
473 | len = 2; | |
474 | else | |
475 | len = 1; | |
171650af AB |
476 | |
477 | if (!(bd->options & NAND_BBT_SCANEMPTY)) { | |
478 | /* We need only read few bytes from the OOB area */ | |
8593fbc6 | 479 | scanlen = 0; |
eeada24d AB |
480 | readlen = bd->len; |
481 | } else { | |
171650af | 482 | /* Full page content should be read */ |
28318776 JE |
483 | scanlen = mtd->writesize + mtd->oobsize; |
484 | readlen = len * mtd->writesize; | |
eeada24d | 485 | } |
1da177e4 LT |
486 | |
487 | if (chip == -1) { | |
8b6e50c9 BN |
488 | /* |
489 | * Note that numblocks is 2 * (real numblocks) here, see i+=2 | |
490 | * below as it makes shifting and masking less painful | |
491 | */ | |
1da177e4 LT |
492 | numblocks = mtd->size >> (this->bbt_erase_shift - 1); |
493 | startblock = 0; | |
494 | from = 0; | |
495 | } else { | |
496 | if (chip >= this->numchips) { | |
9a4d4d69 | 497 | pr_warn("create_bbt(): chipnr (%d) > available chips (%d)\n", |
e0c7d767 | 498 | chip + 1, this->numchips); |
171650af | 499 | return -EINVAL; |
1da177e4 LT |
500 | } |
501 | numblocks = this->chipsize >> (this->bbt_erase_shift - 1); | |
502 | startblock = chip * numblocks; | |
503 | numblocks += startblock; | |
69423d99 | 504 | from = (loff_t)startblock << (this->bbt_erase_shift - 1); |
1da177e4 | 505 | } |
61b03bd7 | 506 | |
5fb1549d | 507 | if (this->bbt_options & NAND_BBT_SCANLASTPAGE) |
b60b08b0 KC |
508 | from += mtd->erasesize - (mtd->writesize * len); |
509 | ||
1da177e4 | 510 | for (i = startblock; i < numblocks;) { |
eeada24d | 511 | int ret; |
61b03bd7 | 512 | |
7cba7b14 SAS |
513 | BUG_ON(bd->options & NAND_BBT_NO_OOB); |
514 | ||
8593fbc6 TG |
515 | if (bd->options & NAND_BBT_SCANALLPAGES) |
516 | ret = scan_block_full(mtd, bd, from, buf, readlen, | |
517 | scanlen, len); | |
518 | else | |
519 | ret = scan_block_fast(mtd, bd, from, buf, len); | |
520 | ||
521 | if (ret < 0) | |
522 | return ret; | |
523 | ||
524 | if (ret) { | |
525 | this->bbt[i >> 3] |= 0x03 << (i & 0x6); | |
9a4d4d69 | 526 | pr_warn("Bad eraseblock %d at 0x%012llx\n", |
d0370219 | 527 | i >> 1, (unsigned long long)from); |
f1a28c02 | 528 | mtd->ecc_stats.badblocks++; |
1da177e4 | 529 | } |
8593fbc6 | 530 | |
1da177e4 LT |
531 | i += 2; |
532 | from += (1 << this->bbt_erase_shift); | |
533 | } | |
eeada24d | 534 | return 0; |
1da177e4 LT |
535 | } |
536 | ||
537 | /** | |
538 | * search_bbt - [GENERIC] scan the device for a specific bad block table | |
8b6e50c9 BN |
539 | * @mtd: MTD device structure |
540 | * @buf: temporary buffer | |
541 | * @td: descriptor for the bad block table | |
1da177e4 | 542 | * |
8b6e50c9 BN |
543 | * Read the bad block table by searching for a given ident pattern. Search is |
544 | * preformed either from the beginning up or from the end of the device | |
545 | * downwards. The search starts always at the start of a block. If the option | |
546 | * NAND_BBT_PERCHIP is given, each chip is searched for a bbt, which contains | |
547 | * the bad block information of this chip. This is necessary to provide support | |
548 | * for certain DOC devices. | |
1da177e4 | 549 | * |
8b6e50c9 | 550 | * The bbt ident pattern resides in the oob area of the first page in a block. |
1da177e4 | 551 | */ |
e0c7d767 | 552 | static int search_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td) |
1da177e4 LT |
553 | { |
554 | struct nand_chip *this = mtd->priv; | |
555 | int i, chips; | |
556 | int bits, startblock, block, dir; | |
28318776 | 557 | int scanlen = mtd->writesize + mtd->oobsize; |
1da177e4 | 558 | int bbtblocks; |
8593fbc6 | 559 | int blocktopage = this->bbt_erase_shift - this->page_shift; |
1da177e4 | 560 | |
8b6e50c9 | 561 | /* Search direction top -> down? */ |
1da177e4 | 562 | if (td->options & NAND_BBT_LASTBLOCK) { |
e0c7d767 | 563 | startblock = (mtd->size >> this->bbt_erase_shift) - 1; |
1da177e4 LT |
564 | dir = -1; |
565 | } else { | |
61b03bd7 | 566 | startblock = 0; |
1da177e4 | 567 | dir = 1; |
61b03bd7 TG |
568 | } |
569 | ||
8b6e50c9 | 570 | /* Do we have a bbt per chip? */ |
1da177e4 LT |
571 | if (td->options & NAND_BBT_PERCHIP) { |
572 | chips = this->numchips; | |
573 | bbtblocks = this->chipsize >> this->bbt_erase_shift; | |
574 | startblock &= bbtblocks - 1; | |
575 | } else { | |
576 | chips = 1; | |
577 | bbtblocks = mtd->size >> this->bbt_erase_shift; | |
578 | } | |
61b03bd7 | 579 | |
1da177e4 LT |
580 | /* Number of bits for each erase block in the bbt */ |
581 | bits = td->options & NAND_BBT_NRBITS_MSK; | |
61b03bd7 | 582 | |
1da177e4 LT |
583 | for (i = 0; i < chips; i++) { |
584 | /* Reset version information */ | |
61b03bd7 | 585 | td->version[i] = 0; |
1da177e4 LT |
586 | td->pages[i] = -1; |
587 | /* Scan the maximum number of blocks */ | |
588 | for (block = 0; block < td->maxblocks; block++) { | |
8593fbc6 | 589 | |
1da177e4 | 590 | int actblock = startblock + dir * block; |
69423d99 | 591 | loff_t offs = (loff_t)actblock << this->bbt_erase_shift; |
8593fbc6 | 592 | |
1da177e4 | 593 | /* Read first page */ |
7cba7b14 | 594 | scan_read_raw(mtd, buf, offs, mtd->writesize, td); |
28318776 | 595 | if (!check_pattern(buf, scanlen, mtd->writesize, td)) { |
8593fbc6 | 596 | td->pages[i] = actblock << blocktopage; |
1da177e4 | 597 | if (td->options & NAND_BBT_VERSION) { |
7cba7b14 SAS |
598 | offs = bbt_get_ver_offs(mtd, td); |
599 | td->version[i] = buf[offs]; | |
1da177e4 LT |
600 | } |
601 | break; | |
602 | } | |
603 | } | |
604 | startblock += this->chipsize >> this->bbt_erase_shift; | |
605 | } | |
606 | /* Check, if we found a bbt for each requested chip */ | |
607 | for (i = 0; i < chips; i++) { | |
608 | if (td->pages[i] == -1) | |
9a4d4d69 | 609 | pr_warn("Bad block table not found for chip %d\n", i); |
1da177e4 | 610 | else |
d0370219 BN |
611 | pr_info("Bad block table found at page %d, version " |
612 | "0x%02X\n", td->pages[i], td->version[i]); | |
1da177e4 | 613 | } |
61b03bd7 | 614 | return 0; |
1da177e4 LT |
615 | } |
616 | ||
617 | /** | |
618 | * search_read_bbts - [GENERIC] scan the device for bad block table(s) | |
8b6e50c9 BN |
619 | * @mtd: MTD device structure |
620 | * @buf: temporary buffer | |
621 | * @td: descriptor for the bad block table | |
622 | * @md: descriptor for the bad block table mirror | |
1da177e4 | 623 | * |
8b6e50c9 BN |
624 | * Search and read the bad block table(s). |
625 | */ | |
e0c7d767 | 626 | static int search_read_bbts(struct mtd_info *mtd, uint8_t * buf, struct nand_bbt_descr *td, struct nand_bbt_descr *md) |
1da177e4 LT |
627 | { |
628 | /* Search the primary table */ | |
e0c7d767 | 629 | search_bbt(mtd, buf, td); |
61b03bd7 | 630 | |
1da177e4 LT |
631 | /* Search the mirror table */ |
632 | if (md) | |
e0c7d767 | 633 | search_bbt(mtd, buf, md); |
61b03bd7 | 634 | |
1da177e4 | 635 | /* Force result check */ |
61b03bd7 | 636 | return 1; |
1da177e4 | 637 | } |
1da177e4 | 638 | |
61b03bd7 | 639 | /** |
1da177e4 | 640 | * write_bbt - [GENERIC] (Re)write the bad block table |
8b6e50c9 BN |
641 | * @mtd: MTD device structure |
642 | * @buf: temporary buffer | |
643 | * @td: descriptor for the bad block table | |
644 | * @md: descriptor for the bad block table mirror | |
645 | * @chipsel: selector for a specific chip, -1 for all | |
1da177e4 | 646 | * |
8b6e50c9 BN |
647 | * (Re)write the bad block table. |
648 | */ | |
e0c7d767 | 649 | static int write_bbt(struct mtd_info *mtd, uint8_t *buf, |
9223a456 TG |
650 | struct nand_bbt_descr *td, struct nand_bbt_descr *md, |
651 | int chipsel) | |
1da177e4 LT |
652 | { |
653 | struct nand_chip *this = mtd->priv; | |
1da177e4 LT |
654 | struct erase_info einfo; |
655 | int i, j, res, chip = 0; | |
656 | int bits, startblock, dir, page, offs, numblocks, sft, sftmsk; | |
9223a456 | 657 | int nrchips, bbtoffs, pageoffs, ooboffs; |
1da177e4 LT |
658 | uint8_t msk[4]; |
659 | uint8_t rcode = td->reserved_block_code; | |
8593fbc6 | 660 | size_t retlen, len = 0; |
1da177e4 | 661 | loff_t to; |
8593fbc6 TG |
662 | struct mtd_oob_ops ops; |
663 | ||
664 | ops.ooblen = mtd->oobsize; | |
665 | ops.ooboffs = 0; | |
666 | ops.datbuf = NULL; | |
0612b9dd | 667 | ops.mode = MTD_OPS_PLACE_OOB; |
1da177e4 LT |
668 | |
669 | if (!rcode) | |
670 | rcode = 0xff; | |
8b6e50c9 | 671 | /* Write bad block table per chip rather than per device? */ |
1da177e4 | 672 | if (td->options & NAND_BBT_PERCHIP) { |
e0c7d767 | 673 | numblocks = (int)(this->chipsize >> this->bbt_erase_shift); |
8b6e50c9 | 674 | /* Full device write or specific chip? */ |
1da177e4 LT |
675 | if (chipsel == -1) { |
676 | nrchips = this->numchips; | |
677 | } else { | |
678 | nrchips = chipsel + 1; | |
679 | chip = chipsel; | |
680 | } | |
681 | } else { | |
e0c7d767 | 682 | numblocks = (int)(mtd->size >> this->bbt_erase_shift); |
1da177e4 | 683 | nrchips = 1; |
61b03bd7 TG |
684 | } |
685 | ||
1da177e4 LT |
686 | /* Loop through the chips */ |
687 | for (; chip < nrchips; chip++) { | |
8b6e50c9 BN |
688 | /* |
689 | * There was already a version of the table, reuse the page | |
61b03bd7 | 690 | * This applies for absolute placement too, as we have the |
1da177e4 LT |
691 | * page nr. in td->pages. |
692 | */ | |
693 | if (td->pages[chip] != -1) { | |
694 | page = td->pages[chip]; | |
695 | goto write; | |
61b03bd7 | 696 | } |
1da177e4 | 697 | |
8b6e50c9 BN |
698 | /* |
699 | * Automatic placement of the bad block table. Search direction | |
700 | * top -> down? | |
701 | */ | |
1da177e4 LT |
702 | if (td->options & NAND_BBT_LASTBLOCK) { |
703 | startblock = numblocks * (chip + 1) - 1; | |
704 | dir = -1; | |
705 | } else { | |
706 | startblock = chip * numblocks; | |
707 | dir = 1; | |
61b03bd7 | 708 | } |
1da177e4 LT |
709 | |
710 | for (i = 0; i < td->maxblocks; i++) { | |
711 | int block = startblock + dir * i; | |
712 | /* Check, if the block is bad */ | |
9223a456 TG |
713 | switch ((this->bbt[block >> 2] >> |
714 | (2 * (block & 0x03))) & 0x03) { | |
1da177e4 LT |
715 | case 0x01: |
716 | case 0x03: | |
717 | continue; | |
718 | } | |
9223a456 TG |
719 | page = block << |
720 | (this->bbt_erase_shift - this->page_shift); | |
1da177e4 LT |
721 | /* Check, if the block is used by the mirror table */ |
722 | if (!md || md->pages[chip] != page) | |
723 | goto write; | |
724 | } | |
9a4d4d69 | 725 | pr_err("No space left to write bad block table\n"); |
1da177e4 | 726 | return -ENOSPC; |
e0c7d767 | 727 | write: |
1da177e4 LT |
728 | |
729 | /* Set up shift count and masks for the flash table */ | |
730 | bits = td->options & NAND_BBT_NRBITS_MSK; | |
9223a456 | 731 | msk[2] = ~rcode; |
1da177e4 | 732 | switch (bits) { |
9223a456 TG |
733 | case 1: sft = 3; sftmsk = 0x07; msk[0] = 0x00; msk[1] = 0x01; |
734 | msk[3] = 0x01; | |
735 | break; | |
736 | case 2: sft = 2; sftmsk = 0x06; msk[0] = 0x00; msk[1] = 0x01; | |
737 | msk[3] = 0x03; | |
738 | break; | |
739 | case 4: sft = 1; sftmsk = 0x04; msk[0] = 0x00; msk[1] = 0x0C; | |
740 | msk[3] = 0x0f; | |
741 | break; | |
742 | case 8: sft = 0; sftmsk = 0x00; msk[0] = 0x00; msk[1] = 0x0F; | |
743 | msk[3] = 0xff; | |
744 | break; | |
1da177e4 LT |
745 | default: return -EINVAL; |
746 | } | |
61b03bd7 | 747 | |
1da177e4 | 748 | bbtoffs = chip * (numblocks >> 2); |
61b03bd7 | 749 | |
596d7452 | 750 | to = ((loff_t)page) << this->page_shift; |
1da177e4 | 751 | |
8b6e50c9 | 752 | /* Must we save the block contents? */ |
1da177e4 LT |
753 | if (td->options & NAND_BBT_SAVECONTENT) { |
754 | /* Make it block aligned */ | |
596d7452 | 755 | to &= ~((loff_t)((1 << this->bbt_erase_shift) - 1)); |
1da177e4 | 756 | len = 1 << this->bbt_erase_shift; |
329ad399 | 757 | res = mtd_read(mtd, to, len, &retlen, buf); |
1da177e4 LT |
758 | if (res < 0) { |
759 | if (retlen != len) { | |
d0370219 BN |
760 | pr_info("nand_bbt: error reading block " |
761 | "for writing the bad block table\n"); | |
1da177e4 LT |
762 | return res; |
763 | } | |
d0370219 BN |
764 | pr_warn("nand_bbt: ECC error while reading " |
765 | "block for writing bad block table\n"); | |
1da177e4 | 766 | } |
9223a456 | 767 | /* Read oob data */ |
7014568b | 768 | ops.ooblen = (len >> this->page_shift) * mtd->oobsize; |
8593fbc6 | 769 | ops.oobbuf = &buf[len]; |
fd2819bb | 770 | res = mtd_read_oob(mtd, to + mtd->writesize, &ops); |
7014568b | 771 | if (res < 0 || ops.oobretlen != ops.ooblen) |
9223a456 TG |
772 | goto outerr; |
773 | ||
1da177e4 LT |
774 | /* Calc the byte offset in the buffer */ |
775 | pageoffs = page - (int)(to >> this->page_shift); | |
776 | offs = pageoffs << this->page_shift; | |
777 | /* Preset the bbt area with 0xff */ | |
596d7452 | 778 | memset(&buf[offs], 0xff, (size_t)(numblocks >> sft)); |
9223a456 TG |
779 | ooboffs = len + (pageoffs * mtd->oobsize); |
780 | ||
7cba7b14 SAS |
781 | } else if (td->options & NAND_BBT_NO_OOB) { |
782 | ooboffs = 0; | |
783 | offs = td->len; | |
8b6e50c9 | 784 | /* The version byte */ |
7cba7b14 SAS |
785 | if (td->options & NAND_BBT_VERSION) |
786 | offs++; | |
787 | /* Calc length */ | |
596d7452 | 788 | len = (size_t)(numblocks >> sft); |
7cba7b14 | 789 | len += offs; |
8b6e50c9 | 790 | /* Make it page aligned! */ |
7cba7b14 SAS |
791 | len = ALIGN(len, mtd->writesize); |
792 | /* Preset the buffer with 0xff */ | |
793 | memset(buf, 0xff, len); | |
794 | /* Pattern is located at the begin of first page */ | |
795 | memcpy(buf, td->pattern, td->len); | |
1da177e4 LT |
796 | } else { |
797 | /* Calc length */ | |
596d7452 | 798 | len = (size_t)(numblocks >> sft); |
8b6e50c9 | 799 | /* Make it page aligned! */ |
cda32091 | 800 | len = ALIGN(len, mtd->writesize); |
1da177e4 | 801 | /* Preset the buffer with 0xff */ |
9223a456 TG |
802 | memset(buf, 0xff, len + |
803 | (len >> this->page_shift)* mtd->oobsize); | |
1da177e4 | 804 | offs = 0; |
9223a456 | 805 | ooboffs = len; |
1da177e4 | 806 | /* Pattern is located in oob area of first page */ |
9223a456 | 807 | memcpy(&buf[ooboffs + td->offs], td->pattern, td->len); |
1da177e4 | 808 | } |
61b03bd7 | 809 | |
9223a456 TG |
810 | if (td->options & NAND_BBT_VERSION) |
811 | buf[ooboffs + td->veroffs] = td->version[chip]; | |
812 | ||
8b6e50c9 | 813 | /* Walk through the memory table */ |
e0c7d767 | 814 | for (i = 0; i < numblocks;) { |
1da177e4 LT |
815 | uint8_t dat; |
816 | dat = this->bbt[bbtoffs + (i >> 2)]; | |
e0c7d767 | 817 | for (j = 0; j < 4; j++, i++) { |
1da177e4 | 818 | int sftcnt = (i << (3 - sft)) & sftmsk; |
8b6e50c9 | 819 | /* Do not store the reserved bbt blocks! */ |
9223a456 TG |
820 | buf[offs + (i >> sft)] &= |
821 | ~(msk[dat & 0x03] << sftcnt); | |
1da177e4 LT |
822 | dat >>= 2; |
823 | } | |
824 | } | |
61b03bd7 | 825 | |
e0c7d767 | 826 | memset(&einfo, 0, sizeof(einfo)); |
1da177e4 | 827 | einfo.mtd = mtd; |
69423d99 | 828 | einfo.addr = to; |
1da177e4 | 829 | einfo.len = 1 << this->bbt_erase_shift; |
e0c7d767 | 830 | res = nand_erase_nand(mtd, &einfo, 1); |
9223a456 TG |
831 | if (res < 0) |
832 | goto outerr; | |
61b03bd7 | 833 | |
7cba7b14 SAS |
834 | res = scan_write_bbt(mtd, to, len, buf, |
835 | td->options & NAND_BBT_NO_OOB ? NULL : | |
836 | &buf[len]); | |
9223a456 TG |
837 | if (res < 0) |
838 | goto outerr; | |
839 | ||
d0370219 BN |
840 | pr_info("Bad block table written to 0x%012llx, version 0x%02X\n", |
841 | (unsigned long long)to, td->version[chip]); | |
61b03bd7 | 842 | |
1da177e4 LT |
843 | /* Mark it as used */ |
844 | td->pages[chip] = page; | |
61b03bd7 | 845 | } |
1da177e4 | 846 | return 0; |
9223a456 TG |
847 | |
848 | outerr: | |
d0370219 | 849 | pr_warn("nand_bbt: error while writing bad block table %d\n", res); |
9223a456 | 850 | return res; |
1da177e4 LT |
851 | } |
852 | ||
853 | /** | |
854 | * nand_memory_bbt - [GENERIC] create a memory based bad block table | |
8b6e50c9 BN |
855 | * @mtd: MTD device structure |
856 | * @bd: descriptor for the good/bad block search pattern | |
1da177e4 | 857 | * |
8b6e50c9 BN |
858 | * The function creates a memory based bbt by scanning the device for |
859 | * manufacturer / software marked good / bad blocks. | |
860 | */ | |
e0c7d767 | 861 | static inline int nand_memory_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd) |
1da177e4 LT |
862 | { |
863 | struct nand_chip *this = mtd->priv; | |
864 | ||
171650af | 865 | bd->options &= ~NAND_BBT_SCANEMPTY; |
4bf63fcb | 866 | return create_bbt(mtd, this->buffers->databuf, bd, -1); |
1da177e4 LT |
867 | } |
868 | ||
869 | /** | |
e0c7d767 | 870 | * check_create - [GENERIC] create and write bbt(s) if necessary |
8b6e50c9 BN |
871 | * @mtd: MTD device structure |
872 | * @buf: temporary buffer | |
873 | * @bd: descriptor for the good/bad block search pattern | |
1da177e4 | 874 | * |
8b6e50c9 BN |
875 | * The function checks the results of the previous call to read_bbt and creates |
876 | * / updates the bbt(s) if necessary. Creation is necessary if no bbt was found | |
877 | * for the chip/device. Update is necessary if one of the tables is missing or | |
878 | * the version nr. of one table is less than the other. | |
879 | */ | |
e0c7d767 | 880 | static int check_create(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *bd) |
1da177e4 | 881 | { |
623978de | 882 | int i, chips, writeops, create, chipsel, res, res2; |
1da177e4 LT |
883 | struct nand_chip *this = mtd->priv; |
884 | struct nand_bbt_descr *td = this->bbt_td; | |
885 | struct nand_bbt_descr *md = this->bbt_md; | |
886 | struct nand_bbt_descr *rd, *rd2; | |
887 | ||
8b6e50c9 | 888 | /* Do we have a bbt per chip? */ |
61b03bd7 | 889 | if (td->options & NAND_BBT_PERCHIP) |
1da177e4 | 890 | chips = this->numchips; |
61b03bd7 | 891 | else |
1da177e4 | 892 | chips = 1; |
61b03bd7 | 893 | |
1da177e4 LT |
894 | for (i = 0; i < chips; i++) { |
895 | writeops = 0; | |
b61bf5bb | 896 | create = 0; |
1da177e4 LT |
897 | rd = NULL; |
898 | rd2 = NULL; | |
623978de | 899 | res = res2 = 0; |
8b6e50c9 | 900 | /* Per chip or per device? */ |
1da177e4 | 901 | chipsel = (td->options & NAND_BBT_PERCHIP) ? i : -1; |
8b6e50c9 | 902 | /* Mirrored table available? */ |
1da177e4 LT |
903 | if (md) { |
904 | if (td->pages[i] == -1 && md->pages[i] == -1) { | |
b61bf5bb | 905 | create = 1; |
1da177e4 | 906 | writeops = 0x03; |
c5e8ef9c | 907 | } else if (td->pages[i] == -1) { |
61b03bd7 | 908 | rd = md; |
596d7452 | 909 | writeops = 0x01; |
c5e8ef9c | 910 | } else if (md->pages[i] == -1) { |
1da177e4 | 911 | rd = td; |
596d7452 | 912 | writeops = 0x02; |
c5e8ef9c | 913 | } else if (td->version[i] == md->version[i]) { |
1da177e4 LT |
914 | rd = td; |
915 | if (!(td->options & NAND_BBT_VERSION)) | |
916 | rd2 = md; | |
c5e8ef9c | 917 | } else if (((int8_t)(td->version[i] - md->version[i])) > 0) { |
1da177e4 | 918 | rd = td; |
596d7452 | 919 | writeops = 0x02; |
1da177e4 LT |
920 | } else { |
921 | rd = md; | |
596d7452 | 922 | writeops = 0x01; |
1da177e4 | 923 | } |
1da177e4 LT |
924 | } else { |
925 | if (td->pages[i] == -1) { | |
b61bf5bb | 926 | create = 1; |
1da177e4 | 927 | writeops = 0x01; |
b61bf5bb BN |
928 | } else { |
929 | rd = td; | |
1da177e4 | 930 | } |
1da177e4 | 931 | } |
61b03bd7 | 932 | |
b61bf5bb BN |
933 | if (create) { |
934 | /* Create the bad block table by scanning the device? */ | |
935 | if (!(td->options & NAND_BBT_CREATE)) | |
936 | continue; | |
937 | ||
938 | /* Create the table in memory by scanning the chip(s) */ | |
939 | if (!(this->bbt_options & NAND_BBT_CREATE_EMPTY)) | |
940 | create_bbt(mtd, buf, bd, chipsel); | |
941 | ||
942 | td->version[i] = 1; | |
943 | if (md) | |
944 | md->version[i] = 1; | |
945 | } | |
946 | ||
8b6e50c9 | 947 | /* Read back first? */ |
623978de BN |
948 | if (rd) { |
949 | res = read_abs_bbt(mtd, buf, rd, chipsel); | |
950 | if (mtd_is_eccerr(res)) { | |
951 | /* Mark table as invalid */ | |
952 | rd->pages[i] = -1; | |
dadc17a3 | 953 | rd->version[i] = 0; |
623978de BN |
954 | i--; |
955 | continue; | |
956 | } | |
957 | } | |
8b6e50c9 | 958 | /* If they weren't versioned, read both */ |
623978de BN |
959 | if (rd2) { |
960 | res2 = read_abs_bbt(mtd, buf, rd2, chipsel); | |
961 | if (mtd_is_eccerr(res2)) { | |
962 | /* Mark table as invalid */ | |
963 | rd2->pages[i] = -1; | |
dadc17a3 | 964 | rd2->version[i] = 0; |
623978de BN |
965 | i--; |
966 | continue; | |
967 | } | |
968 | } | |
969 | ||
970 | /* Scrub the flash table(s)? */ | |
971 | if (mtd_is_bitflip(res) || mtd_is_bitflip(res2)) | |
972 | writeops = 0x03; | |
1da177e4 | 973 | |
dadc17a3 BN |
974 | /* Update version numbers before writing */ |
975 | if (md) { | |
976 | td->version[i] = max(td->version[i], md->version[i]); | |
977 | md->version[i] = td->version[i]; | |
978 | } | |
979 | ||
8b6e50c9 | 980 | /* Write the bad block table to the device? */ |
1da177e4 | 981 | if ((writeops & 0x01) && (td->options & NAND_BBT_WRITE)) { |
e0c7d767 | 982 | res = write_bbt(mtd, buf, td, md, chipsel); |
1da177e4 LT |
983 | if (res < 0) |
984 | return res; | |
985 | } | |
61b03bd7 | 986 | |
8b6e50c9 | 987 | /* Write the mirror bad block table to the device? */ |
1da177e4 | 988 | if ((writeops & 0x02) && md && (md->options & NAND_BBT_WRITE)) { |
e0c7d767 | 989 | res = write_bbt(mtd, buf, md, td, chipsel); |
1da177e4 LT |
990 | if (res < 0) |
991 | return res; | |
992 | } | |
993 | } | |
61b03bd7 | 994 | return 0; |
1da177e4 LT |
995 | } |
996 | ||
997 | /** | |
61b03bd7 | 998 | * mark_bbt_regions - [GENERIC] mark the bad block table regions |
8b6e50c9 BN |
999 | * @mtd: MTD device structure |
1000 | * @td: bad block table descriptor | |
1da177e4 | 1001 | * |
8b6e50c9 BN |
1002 | * The bad block table regions are marked as "bad" to prevent accidental |
1003 | * erasures / writes. The regions are identified by the mark 0x02. | |
1004 | */ | |
e0c7d767 | 1005 | static void mark_bbt_region(struct mtd_info *mtd, struct nand_bbt_descr *td) |
1da177e4 LT |
1006 | { |
1007 | struct nand_chip *this = mtd->priv; | |
1008 | int i, j, chips, block, nrblocks, update; | |
1009 | uint8_t oldval, newval; | |
1010 | ||
8b6e50c9 | 1011 | /* Do we have a bbt per chip? */ |
1da177e4 LT |
1012 | if (td->options & NAND_BBT_PERCHIP) { |
1013 | chips = this->numchips; | |
1014 | nrblocks = (int)(this->chipsize >> this->bbt_erase_shift); | |
1015 | } else { | |
1016 | chips = 1; | |
1017 | nrblocks = (int)(mtd->size >> this->bbt_erase_shift); | |
61b03bd7 TG |
1018 | } |
1019 | ||
1da177e4 LT |
1020 | for (i = 0; i < chips; i++) { |
1021 | if ((td->options & NAND_BBT_ABSPAGE) || | |
1022 | !(td->options & NAND_BBT_WRITE)) { | |
e0c7d767 DW |
1023 | if (td->pages[i] == -1) |
1024 | continue; | |
1da177e4 | 1025 | block = td->pages[i] >> (this->bbt_erase_shift - this->page_shift); |
61b03bd7 | 1026 | block <<= 1; |
1da177e4 LT |
1027 | oldval = this->bbt[(block >> 3)]; |
1028 | newval = oldval | (0x2 << (block & 0x06)); | |
1029 | this->bbt[(block >> 3)] = newval; | |
1030 | if ((oldval != newval) && td->reserved_block_code) | |
69423d99 | 1031 | nand_update_bbt(mtd, (loff_t)block << (this->bbt_erase_shift - 1)); |
1da177e4 LT |
1032 | continue; |
1033 | } | |
1034 | update = 0; | |
1035 | if (td->options & NAND_BBT_LASTBLOCK) | |
1036 | block = ((i + 1) * nrblocks) - td->maxblocks; | |
61b03bd7 | 1037 | else |
1da177e4 | 1038 | block = i * nrblocks; |
61b03bd7 | 1039 | block <<= 1; |
1da177e4 LT |
1040 | for (j = 0; j < td->maxblocks; j++) { |
1041 | oldval = this->bbt[(block >> 3)]; | |
1042 | newval = oldval | (0x2 << (block & 0x06)); | |
1043 | this->bbt[(block >> 3)] = newval; | |
e0c7d767 DW |
1044 | if (oldval != newval) |
1045 | update = 1; | |
1da177e4 | 1046 | block += 2; |
61b03bd7 | 1047 | } |
8b6e50c9 BN |
1048 | /* |
1049 | * If we want reserved blocks to be recorded to flash, and some | |
1050 | * new ones have been marked, then we need to update the stored | |
1051 | * bbts. This should only happen once. | |
1052 | */ | |
1da177e4 | 1053 | if (update && td->reserved_block_code) |
69423d99 | 1054 | nand_update_bbt(mtd, (loff_t)(block - 2) << (this->bbt_erase_shift - 1)); |
1da177e4 LT |
1055 | } |
1056 | } | |
1057 | ||
7cba7b14 SAS |
1058 | /** |
1059 | * verify_bbt_descr - verify the bad block description | |
8b6e50c9 BN |
1060 | * @mtd: MTD device structure |
1061 | * @bd: the table to verify | |
7cba7b14 SAS |
1062 | * |
1063 | * This functions performs a few sanity checks on the bad block description | |
1064 | * table. | |
1065 | */ | |
1066 | static void verify_bbt_descr(struct mtd_info *mtd, struct nand_bbt_descr *bd) | |
1067 | { | |
1068 | struct nand_chip *this = mtd->priv; | |
7912a5e7 SF |
1069 | u32 pattern_len; |
1070 | u32 bits; | |
7cba7b14 SAS |
1071 | u32 table_size; |
1072 | ||
1073 | if (!bd) | |
1074 | return; | |
7912a5e7 SF |
1075 | |
1076 | pattern_len = bd->len; | |
1077 | bits = bd->options & NAND_BBT_NRBITS_MSK; | |
1078 | ||
a40f7341 | 1079 | BUG_ON((this->bbt_options & NAND_BBT_NO_OOB) && |
bb9ebd4e | 1080 | !(this->bbt_options & NAND_BBT_USE_FLASH)); |
7cba7b14 SAS |
1081 | BUG_ON(!bits); |
1082 | ||
1083 | if (bd->options & NAND_BBT_VERSION) | |
1084 | pattern_len++; | |
1085 | ||
1086 | if (bd->options & NAND_BBT_NO_OOB) { | |
bb9ebd4e | 1087 | BUG_ON(!(this->bbt_options & NAND_BBT_USE_FLASH)); |
a40f7341 | 1088 | BUG_ON(!(this->bbt_options & NAND_BBT_NO_OOB)); |
7cba7b14 SAS |
1089 | BUG_ON(bd->offs); |
1090 | if (bd->options & NAND_BBT_VERSION) | |
1091 | BUG_ON(bd->veroffs != bd->len); | |
1092 | BUG_ON(bd->options & NAND_BBT_SAVECONTENT); | |
1093 | } | |
1094 | ||
1095 | if (bd->options & NAND_BBT_PERCHIP) | |
1096 | table_size = this->chipsize >> this->bbt_erase_shift; | |
1097 | else | |
1098 | table_size = mtd->size >> this->bbt_erase_shift; | |
1099 | table_size >>= 3; | |
1100 | table_size *= bits; | |
1101 | if (bd->options & NAND_BBT_NO_OOB) | |
1102 | table_size += pattern_len; | |
1103 | BUG_ON(table_size > (1 << this->bbt_erase_shift)); | |
1104 | } | |
1105 | ||
1da177e4 LT |
1106 | /** |
1107 | * nand_scan_bbt - [NAND Interface] scan, find, read and maybe create bad block table(s) | |
8b6e50c9 BN |
1108 | * @mtd: MTD device structure |
1109 | * @bd: descriptor for the good/bad block search pattern | |
1da177e4 | 1110 | * |
8b6e50c9 BN |
1111 | * The function checks, if a bad block table(s) is/are already available. If |
1112 | * not it scans the device for manufacturer marked good / bad blocks and writes | |
1113 | * the bad block table(s) to the selected place. | |
1da177e4 | 1114 | * |
8b6e50c9 BN |
1115 | * The bad block table memory is allocated here. It must be freed by calling |
1116 | * the nand_free_bbt function. | |
1117 | */ | |
e0c7d767 | 1118 | int nand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd) |
1da177e4 LT |
1119 | { |
1120 | struct nand_chip *this = mtd->priv; | |
1121 | int len, res = 0; | |
1122 | uint8_t *buf; | |
1123 | struct nand_bbt_descr *td = this->bbt_td; | |
1124 | struct nand_bbt_descr *md = this->bbt_md; | |
1125 | ||
1126 | len = mtd->size >> (this->bbt_erase_shift + 2); | |
8b6e50c9 BN |
1127 | /* |
1128 | * Allocate memory (2bit per block) and clear the memory bad block | |
1129 | * table. | |
1130 | */ | |
95b93a0c | 1131 | this->bbt = kzalloc(len, GFP_KERNEL); |
0870066d | 1132 | if (!this->bbt) |
1da177e4 | 1133 | return -ENOMEM; |
1da177e4 | 1134 | |
8b6e50c9 BN |
1135 | /* |
1136 | * If no primary table decriptor is given, scan the device to build a | |
1137 | * memory based bad block table. | |
1da177e4 | 1138 | */ |
eeada24d AB |
1139 | if (!td) { |
1140 | if ((res = nand_memory_bbt(mtd, bd))) { | |
d0370219 | 1141 | pr_err("nand_bbt: can't scan flash and build the RAM-based BBT\n"); |
e0c7d767 | 1142 | kfree(this->bbt); |
eeada24d AB |
1143 | this->bbt = NULL; |
1144 | } | |
1145 | return res; | |
1146 | } | |
7cba7b14 SAS |
1147 | verify_bbt_descr(mtd, td); |
1148 | verify_bbt_descr(mtd, md); | |
1da177e4 LT |
1149 | |
1150 | /* Allocate a temporary buffer for one eraseblock incl. oob */ | |
1151 | len = (1 << this->bbt_erase_shift); | |
1152 | len += (len >> this->page_shift) * mtd->oobsize; | |
c3f8abf4 | 1153 | buf = vmalloc(len); |
1da177e4 | 1154 | if (!buf) { |
e0c7d767 | 1155 | kfree(this->bbt); |
1da177e4 LT |
1156 | this->bbt = NULL; |
1157 | return -ENOMEM; | |
1158 | } | |
61b03bd7 | 1159 | |
8b6e50c9 | 1160 | /* Is the bbt at a given page? */ |
1da177e4 | 1161 | if (td->options & NAND_BBT_ABSPAGE) { |
e0c7d767 | 1162 | res = read_abs_bbts(mtd, buf, td, md); |
61b03bd7 | 1163 | } else { |
1da177e4 | 1164 | /* Search the bad block table using a pattern in oob */ |
e0c7d767 | 1165 | res = search_read_bbts(mtd, buf, td, md); |
61b03bd7 | 1166 | } |
1da177e4 | 1167 | |
61b03bd7 | 1168 | if (res) |
e0c7d767 | 1169 | res = check_create(mtd, buf, bd); |
61b03bd7 | 1170 | |
1da177e4 | 1171 | /* Prevent the bbt regions from erasing / writing */ |
e0c7d767 | 1172 | mark_bbt_region(mtd, td); |
1da177e4 | 1173 | if (md) |
e0c7d767 | 1174 | mark_bbt_region(mtd, md); |
61b03bd7 | 1175 | |
e0c7d767 | 1176 | vfree(buf); |
1da177e4 LT |
1177 | return res; |
1178 | } | |
1179 | ||
1da177e4 | 1180 | /** |
61b03bd7 | 1181 | * nand_update_bbt - [NAND Interface] update bad block table(s) |
8b6e50c9 BN |
1182 | * @mtd: MTD device structure |
1183 | * @offs: the offset of the newly marked block | |
1da177e4 | 1184 | * |
8b6e50c9 BN |
1185 | * The function updates the bad block table(s). |
1186 | */ | |
e0c7d767 | 1187 | int nand_update_bbt(struct mtd_info *mtd, loff_t offs) |
1da177e4 LT |
1188 | { |
1189 | struct nand_chip *this = mtd->priv; | |
1196ac5a | 1190 | int len, res = 0; |
1da177e4 LT |
1191 | int chip, chipsel; |
1192 | uint8_t *buf; | |
1193 | struct nand_bbt_descr *td = this->bbt_td; | |
1194 | struct nand_bbt_descr *md = this->bbt_md; | |
1195 | ||
1196 | if (!this->bbt || !td) | |
1197 | return -EINVAL; | |
1198 | ||
1da177e4 LT |
1199 | /* Allocate a temporary buffer for one eraseblock incl. oob */ |
1200 | len = (1 << this->bbt_erase_shift); | |
1201 | len += (len >> this->page_shift) * mtd->oobsize; | |
e0c7d767 | 1202 | buf = kmalloc(len, GFP_KERNEL); |
0870066d | 1203 | if (!buf) |
1da177e4 | 1204 | return -ENOMEM; |
1da177e4 | 1205 | |
8b6e50c9 | 1206 | /* Do we have a bbt per chip? */ |
1da177e4 | 1207 | if (td->options & NAND_BBT_PERCHIP) { |
e0c7d767 | 1208 | chip = (int)(offs >> this->chip_shift); |
1da177e4 LT |
1209 | chipsel = chip; |
1210 | } else { | |
1211 | chip = 0; | |
1212 | chipsel = -1; | |
1213 | } | |
1214 | ||
1215 | td->version[chip]++; | |
1216 | if (md) | |
61b03bd7 | 1217 | md->version[chip]++; |
1da177e4 | 1218 | |
8b6e50c9 | 1219 | /* Write the bad block table to the device? */ |
1196ac5a | 1220 | if (td->options & NAND_BBT_WRITE) { |
e0c7d767 | 1221 | res = write_bbt(mtd, buf, td, md, chipsel); |
1da177e4 LT |
1222 | if (res < 0) |
1223 | goto out; | |
1224 | } | |
8b6e50c9 | 1225 | /* Write the mirror bad block table to the device? */ |
1196ac5a | 1226 | if (md && (md->options & NAND_BBT_WRITE)) { |
e0c7d767 | 1227 | res = write_bbt(mtd, buf, md, td, chipsel); |
1da177e4 LT |
1228 | } |
1229 | ||
e0c7d767 DW |
1230 | out: |
1231 | kfree(buf); | |
1da177e4 LT |
1232 | return res; |
1233 | } | |
1234 | ||
8b6e50c9 BN |
1235 | /* |
1236 | * Define some generic bad / good block scan pattern which are used | |
1237 | * while scanning a device for factory marked good / bad blocks. | |
1238 | */ | |
1da177e4 LT |
1239 | static uint8_t scan_ff_pattern[] = { 0xff, 0xff }; |
1240 | ||
1da177e4 LT |
1241 | static uint8_t scan_agand_pattern[] = { 0x1C, 0x71, 0xC7, 0x1C, 0x71, 0xC7 }; |
1242 | ||
1243 | static struct nand_bbt_descr agand_flashbased = { | |
1244 | .options = NAND_BBT_SCANEMPTY | NAND_BBT_SCANALLPAGES, | |
1245 | .offs = 0x20, | |
1246 | .len = 6, | |
1247 | .pattern = scan_agand_pattern | |
1248 | }; | |
1249 | ||
7854d3f7 | 1250 | /* Generic flash bbt descriptors */ |
1da177e4 LT |
1251 | static uint8_t bbt_pattern[] = {'B', 'b', 't', '0' }; |
1252 | static uint8_t mirror_pattern[] = {'1', 't', 'b', 'B' }; | |
1253 | ||
1254 | static struct nand_bbt_descr bbt_main_descr = { | |
61b03bd7 | 1255 | .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
1da177e4 LT |
1256 | | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP, |
1257 | .offs = 8, | |
1258 | .len = 4, | |
1259 | .veroffs = 12, | |
1260 | .maxblocks = 4, | |
1261 | .pattern = bbt_pattern | |
1262 | }; | |
1263 | ||
1264 | static struct nand_bbt_descr bbt_mirror_descr = { | |
61b03bd7 | 1265 | .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
1da177e4 LT |
1266 | | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP, |
1267 | .offs = 8, | |
1268 | .len = 4, | |
1269 | .veroffs = 12, | |
1270 | .maxblocks = 4, | |
1271 | .pattern = mirror_pattern | |
1272 | }; | |
1273 | ||
9fd6b37a | 1274 | static struct nand_bbt_descr bbt_main_no_oob_descr = { |
7cba7b14 SAS |
1275 | .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
1276 | | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP | |
1277 | | NAND_BBT_NO_OOB, | |
1278 | .len = 4, | |
1279 | .veroffs = 4, | |
1280 | .maxblocks = 4, | |
1281 | .pattern = bbt_pattern | |
1282 | }; | |
1283 | ||
9fd6b37a | 1284 | static struct nand_bbt_descr bbt_mirror_no_oob_descr = { |
7cba7b14 SAS |
1285 | .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
1286 | | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP | |
1287 | | NAND_BBT_NO_OOB, | |
1288 | .len = 4, | |
1289 | .veroffs = 4, | |
1290 | .maxblocks = 4, | |
1291 | .pattern = mirror_pattern | |
1292 | }; | |
1293 | ||
752ed6c5 | 1294 | #define BADBLOCK_SCAN_MASK (~NAND_BBT_NO_OOB) |
58373ff0 | 1295 | /** |
752ed6c5 | 1296 | * nand_create_badblock_pattern - [INTERN] Creates a BBT descriptor structure |
8b6e50c9 | 1297 | * @this: NAND chip to create descriptor for |
58373ff0 BN |
1298 | * |
1299 | * This function allocates and initializes a nand_bbt_descr for BBM detection | |
752ed6c5 | 1300 | * based on the properties of @this. The new descriptor is stored in |
58373ff0 BN |
1301 | * this->badblock_pattern. Thus, this->badblock_pattern should be NULL when |
1302 | * passed to this function. | |
58373ff0 | 1303 | */ |
752ed6c5 | 1304 | static int nand_create_badblock_pattern(struct nand_chip *this) |
58373ff0 BN |
1305 | { |
1306 | struct nand_bbt_descr *bd; | |
1307 | if (this->badblock_pattern) { | |
752ed6c5 | 1308 | pr_warn("Bad block pattern already allocated; not replacing\n"); |
58373ff0 BN |
1309 | return -EINVAL; |
1310 | } | |
1311 | bd = kzalloc(sizeof(*bd), GFP_KERNEL); | |
0870066d | 1312 | if (!bd) |
58373ff0 | 1313 | return -ENOMEM; |
752ed6c5 | 1314 | bd->options = this->bbt_options & BADBLOCK_SCAN_MASK; |
58373ff0 BN |
1315 | bd->offs = this->badblockpos; |
1316 | bd->len = (this->options & NAND_BUSWIDTH_16) ? 2 : 1; | |
1317 | bd->pattern = scan_ff_pattern; | |
1318 | bd->options |= NAND_BBT_DYNAMICSTRUCT; | |
1319 | this->badblock_pattern = bd; | |
1320 | return 0; | |
1321 | } | |
1322 | ||
1da177e4 | 1323 | /** |
61b03bd7 | 1324 | * nand_default_bbt - [NAND Interface] Select a default bad block table for the device |
8b6e50c9 | 1325 | * @mtd: MTD device structure |
1da177e4 | 1326 | * |
8b6e50c9 BN |
1327 | * This function selects the default bad block table support for the device and |
1328 | * calls the nand_scan_bbt function. | |
1329 | */ | |
e0c7d767 | 1330 | int nand_default_bbt(struct mtd_info *mtd) |
1da177e4 LT |
1331 | { |
1332 | struct nand_chip *this = mtd->priv; | |
61b03bd7 | 1333 | |
8b6e50c9 BN |
1334 | /* |
1335 | * Default for AG-AND. We must use a flash based bad block table as the | |
1336 | * devices have factory marked _good_ blocks. Erasing those blocks | |
1337 | * leads to loss of the good / bad information, so we _must_ store this | |
1338 | * information in a good / bad table during startup. | |
e0c7d767 | 1339 | */ |
1da177e4 LT |
1340 | if (this->options & NAND_IS_AND) { |
1341 | /* Use the default pattern descriptors */ | |
61b03bd7 | 1342 | if (!this->bbt_td) { |
1da177e4 LT |
1343 | this->bbt_td = &bbt_main_descr; |
1344 | this->bbt_md = &bbt_mirror_descr; | |
61b03bd7 | 1345 | } |
bb9ebd4e | 1346 | this->bbt_options |= NAND_BBT_USE_FLASH; |
e0c7d767 | 1347 | return nand_scan_bbt(mtd, &agand_flashbased); |
1da177e4 | 1348 | } |
61b03bd7 | 1349 | |
8b6e50c9 | 1350 | /* Is a flash based bad block table requested? */ |
bb9ebd4e | 1351 | if (this->bbt_options & NAND_BBT_USE_FLASH) { |
61b03bd7 TG |
1352 | /* Use the default pattern descriptors */ |
1353 | if (!this->bbt_td) { | |
a40f7341 | 1354 | if (this->bbt_options & NAND_BBT_NO_OOB) { |
9fd6b37a BN |
1355 | this->bbt_td = &bbt_main_no_oob_descr; |
1356 | this->bbt_md = &bbt_mirror_no_oob_descr; | |
7cba7b14 SAS |
1357 | } else { |
1358 | this->bbt_td = &bbt_main_descr; | |
1359 | this->bbt_md = &bbt_mirror_descr; | |
1360 | } | |
1da177e4 | 1361 | } |
1da177e4 LT |
1362 | } else { |
1363 | this->bbt_td = NULL; | |
1364 | this->bbt_md = NULL; | |
1da177e4 | 1365 | } |
a2f812df BN |
1366 | |
1367 | if (!this->badblock_pattern) | |
752ed6c5 | 1368 | nand_create_badblock_pattern(this); |
a2f812df | 1369 | |
e0c7d767 | 1370 | return nand_scan_bbt(mtd, this->badblock_pattern); |
1da177e4 LT |
1371 | } |
1372 | ||
1373 | /** | |
61b03bd7 | 1374 | * nand_isbad_bbt - [NAND Interface] Check if a block is bad |
8b6e50c9 BN |
1375 | * @mtd: MTD device structure |
1376 | * @offs: offset in the device | |
1377 | * @allowbbt: allow access to bad block table region | |
1378 | */ | |
e0c7d767 | 1379 | int nand_isbad_bbt(struct mtd_info *mtd, loff_t offs, int allowbbt) |
1da177e4 LT |
1380 | { |
1381 | struct nand_chip *this = mtd->priv; | |
1382 | int block; | |
e0c7d767 | 1383 | uint8_t res; |
61b03bd7 | 1384 | |
1da177e4 | 1385 | /* Get block number * 2 */ |
e0c7d767 | 1386 | block = (int)(offs >> (this->bbt_erase_shift - 1)); |
1da177e4 LT |
1387 | res = (this->bbt[block >> 3] >> (block & 0x06)) & 0x03; |
1388 | ||
289c0522 BN |
1389 | pr_debug("nand_isbad_bbt(): bbt info for offs 0x%08x: " |
1390 | "(block %d) 0x%02x\n", | |
1391 | (unsigned int)offs, block >> 1, res); | |
1da177e4 LT |
1392 | |
1393 | switch ((int)res) { | |
e0c7d767 DW |
1394 | case 0x00: |
1395 | return 0; | |
1396 | case 0x01: | |
1397 | return 1; | |
1398 | case 0x02: | |
1399 | return allowbbt ? 0 : 1; | |
1da177e4 LT |
1400 | } |
1401 | return 1; | |
1402 | } | |
1403 | ||
e0c7d767 DW |
1404 | EXPORT_SYMBOL(nand_scan_bbt); |
1405 | EXPORT_SYMBOL(nand_default_bbt); |