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 | |
44ed0ffd | 25 | * version number, then 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27 | * If one of the BBTs is out of date or does not exist it is (re)created.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> |
491ed06f | 71 | #include <linux/string.h> |
1da177e4 | 72 | |
7cba7b14 SAS |
73 | static int check_pattern_no_oob(uint8_t *buf, struct nand_bbt_descr *td) |
74 | { | |
718894ad BN |
75 | if (memcmp(buf, td->pattern, td->len)) |
76 | return -1; | |
77 | return 0; | |
7cba7b14 SAS |
78 | } |
79 | ||
61b03bd7 | 80 | /** |
1da177e4 | 81 | * check_pattern - [GENERIC] check if a pattern is in the buffer |
8b6e50c9 BN |
82 | * @buf: the buffer to search |
83 | * @len: the length of buffer to search | |
84 | * @paglen: the pagelength | |
85 | * @td: search pattern descriptor | |
1da177e4 | 86 | * |
8b6e50c9 BN |
87 | * Check for a pattern at the given place. Used to search bad block tables and |
88 | * good / bad block identifiers. If the SCAN_EMPTY option is set then check, if | |
89 | * all bytes except the pattern area contain 0xff. | |
90 | */ | |
e0c7d767 | 91 | static int check_pattern(uint8_t *buf, int len, int paglen, struct nand_bbt_descr *td) |
1da177e4 | 92 | { |
491ed06f | 93 | int end = 0; |
1da177e4 LT |
94 | uint8_t *p = buf; |
95 | ||
7cba7b14 SAS |
96 | if (td->options & NAND_BBT_NO_OOB) |
97 | return check_pattern_no_oob(buf, td); | |
98 | ||
c9e05365 | 99 | end = paglen + td->offs; |
491ed06f BN |
100 | if (td->options & NAND_BBT_SCANEMPTY) |
101 | if (memchr_inv(p, 0xff, end)) | |
102 | return -1; | |
c9e05365 | 103 | p += end; |
61b03bd7 | 104 | |
1da177e4 | 105 | /* Compare the pattern */ |
75b66d8c BN |
106 | if (memcmp(p, td->pattern, td->len)) |
107 | return -1; | |
58373ff0 | 108 | |
1da177e4 | 109 | if (td->options & NAND_BBT_SCANEMPTY) { |
171650af AB |
110 | p += td->len; |
111 | end += td->len; | |
491ed06f BN |
112 | if (memchr_inv(p, 0xff, len - end)) |
113 | return -1; | |
1da177e4 LT |
114 | } |
115 | return 0; | |
116 | } | |
117 | ||
61b03bd7 | 118 | /** |
c9e05365 | 119 | * check_short_pattern - [GENERIC] check if a pattern is in the buffer |
8b6e50c9 BN |
120 | * @buf: the buffer to search |
121 | * @td: search pattern descriptor | |
c9e05365 | 122 | * |
8b6e50c9 BN |
123 | * Check for a pattern at the given place. Used to search bad block tables and |
124 | * good / bad block identifiers. Same as check_pattern, but no optional empty | |
125 | * check. | |
126 | */ | |
e0c7d767 | 127 | static int check_short_pattern(uint8_t *buf, struct nand_bbt_descr *td) |
c9e05365 | 128 | { |
c9e05365 | 129 | /* Compare the pattern */ |
491ed06f BN |
130 | if (memcmp(buf + td->offs, td->pattern, td->len)) |
131 | return -1; | |
c9e05365 TG |
132 | return 0; |
133 | } | |
134 | ||
7cba7b14 SAS |
135 | /** |
136 | * add_marker_len - compute the length of the marker in data area | |
8b6e50c9 | 137 | * @td: BBT descriptor used for computation |
7cba7b14 | 138 | * |
7854d3f7 | 139 | * The length will be 0 if the marker is located in OOB area. |
7cba7b14 SAS |
140 | */ |
141 | static u32 add_marker_len(struct nand_bbt_descr *td) | |
142 | { | |
143 | u32 len; | |
144 | ||
145 | if (!(td->options & NAND_BBT_NO_OOB)) | |
146 | return 0; | |
147 | ||
148 | len = td->len; | |
149 | if (td->options & NAND_BBT_VERSION) | |
150 | len++; | |
151 | return len; | |
152 | } | |
153 | ||
1da177e4 LT |
154 | /** |
155 | * read_bbt - [GENERIC] Read the bad block table starting from page | |
8b6e50c9 BN |
156 | * @mtd: MTD device structure |
157 | * @buf: temporary buffer | |
158 | * @page: the starting page | |
159 | * @num: the number of bbt descriptors to read | |
7854d3f7 | 160 | * @td: the bbt describtion table |
8b6e50c9 | 161 | * @offs: offset in the memory table |
1da177e4 LT |
162 | * |
163 | * Read the bad block table starting from page. | |
1da177e4 | 164 | */ |
e0c7d767 | 165 | static int read_bbt(struct mtd_info *mtd, uint8_t *buf, int page, int num, |
df5b4e34 | 166 | struct nand_bbt_descr *td, int offs) |
1da177e4 | 167 | { |
167a8d52 | 168 | int res, ret = 0, i, j, act = 0; |
1da177e4 LT |
169 | struct nand_chip *this = mtd->priv; |
170 | size_t retlen, len, totlen; | |
171 | loff_t from; | |
df5b4e34 | 172 | int bits = td->options & NAND_BBT_NRBITS_MSK; |
596d7452 | 173 | uint8_t msk = (uint8_t)((1 << bits) - 1); |
7cba7b14 | 174 | u32 marker_len; |
df5b4e34 | 175 | int reserved_block_code = td->reserved_block_code; |
1da177e4 LT |
176 | |
177 | totlen = (num * bits) >> 3; | |
7cba7b14 | 178 | marker_len = add_marker_len(td); |
596d7452 | 179 | from = ((loff_t)page) << this->page_shift; |
61b03bd7 | 180 | |
1da177e4 | 181 | while (totlen) { |
596d7452 | 182 | len = min(totlen, (size_t)(1 << this->bbt_erase_shift)); |
7cba7b14 SAS |
183 | if (marker_len) { |
184 | /* | |
185 | * In case the BBT marker is not in the OOB area it | |
186 | * will be just in the first page. | |
187 | */ | |
188 | len -= marker_len; | |
189 | from += marker_len; | |
190 | marker_len = 0; | |
191 | } | |
329ad399 | 192 | res = mtd_read(mtd, from, len, &retlen, buf); |
1da177e4 | 193 | if (res < 0) { |
167a8d52 BN |
194 | if (mtd_is_eccerr(res)) { |
195 | pr_info("nand_bbt: ECC error in BBT at " | |
196 | "0x%012llx\n", from & ~mtd->writesize); | |
197 | return res; | |
198 | } else if (mtd_is_bitflip(res)) { | |
199 | pr_info("nand_bbt: corrected error in BBT at " | |
200 | "0x%012llx\n", from & ~mtd->writesize); | |
201 | ret = res; | |
202 | } else { | |
203 | pr_info("nand_bbt: error reading BBT\n"); | |
1da177e4 LT |
204 | return res; |
205 | } | |
61b03bd7 | 206 | } |
1da177e4 LT |
207 | |
208 | /* Analyse data */ | |
209 | for (i = 0; i < len; i++) { | |
210 | uint8_t dat = buf[i]; | |
211 | for (j = 0; j < 8; j += bits, act += 2) { | |
212 | uint8_t tmp = (dat >> j) & msk; | |
213 | if (tmp == msk) | |
214 | continue; | |
e0c7d767 | 215 | if (reserved_block_code && (tmp == reserved_block_code)) { |
d0370219 BN |
216 | pr_info("nand_read_bbt: reserved block at 0x%012llx\n", |
217 | (loff_t)((offs << 2) + (act >> 1)) << this->bbt_erase_shift); | |
1da177e4 | 218 | this->bbt[offs + (act >> 3)] |= 0x2 << (act & 0x06); |
f1a28c02 | 219 | mtd->ecc_stats.bbtblocks++; |
1da177e4 LT |
220 | continue; |
221 | } | |
8b6e50c9 BN |
222 | /* |
223 | * Leave it for now, if it's matured we can | |
a0f5080e | 224 | * move this message to pr_debug. |
8b6e50c9 | 225 | */ |
d0370219 BN |
226 | pr_info("nand_read_bbt: bad block at 0x%012llx\n", |
227 | (loff_t)((offs << 2) + (act >> 1)) << this->bbt_erase_shift); | |
8b6e50c9 | 228 | /* Factory marked bad or worn out? */ |
1da177e4 LT |
229 | if (tmp == 0) |
230 | this->bbt[offs + (act >> 3)] |= 0x3 << (act & 0x06); | |
231 | else | |
232 | this->bbt[offs + (act >> 3)] |= 0x1 << (act & 0x06); | |
f1a28c02 | 233 | mtd->ecc_stats.badblocks++; |
61b03bd7 | 234 | } |
1da177e4 LT |
235 | } |
236 | totlen -= len; | |
237 | from += len; | |
238 | } | |
167a8d52 | 239 | return ret; |
1da177e4 LT |
240 | } |
241 | ||
242 | /** | |
243 | * read_abs_bbt - [GENERIC] Read the bad block table starting at a given page | |
8b6e50c9 BN |
244 | * @mtd: MTD device structure |
245 | * @buf: temporary buffer | |
246 | * @td: descriptor for the bad block table | |
596d7452 | 247 | * @chip: read the table for a specific chip, -1 read all chips; applies only if |
8b6e50c9 | 248 | * NAND_BBT_PERCHIP option is set |
1da177e4 | 249 | * |
8b6e50c9 BN |
250 | * Read the bad block table for all chips starting at a given page. We assume |
251 | * that the bbt bits are in consecutive order. | |
252 | */ | |
e0c7d767 | 253 | static int read_abs_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td, int chip) |
1da177e4 LT |
254 | { |
255 | struct nand_chip *this = mtd->priv; | |
256 | int res = 0, i; | |
1da177e4 | 257 | |
1da177e4 LT |
258 | if (td->options & NAND_BBT_PERCHIP) { |
259 | int offs = 0; | |
260 | for (i = 0; i < this->numchips; i++) { | |
261 | if (chip == -1 || chip == i) | |
df5b4e34 SAS |
262 | res = read_bbt(mtd, buf, td->pages[i], |
263 | this->chipsize >> this->bbt_erase_shift, | |
264 | td, offs); | |
1da177e4 LT |
265 | if (res) |
266 | return res; | |
267 | offs += this->chipsize >> (this->bbt_erase_shift + 2); | |
268 | } | |
269 | } else { | |
df5b4e34 SAS |
270 | res = read_bbt(mtd, buf, td->pages[0], |
271 | mtd->size >> this->bbt_erase_shift, td, 0); | |
1da177e4 LT |
272 | if (res) |
273 | return res; | |
274 | } | |
275 | return 0; | |
276 | } | |
277 | ||
8b6e50c9 | 278 | /* BBT marker is in the first page, no OOB */ |
7cba7b14 SAS |
279 | static int scan_read_raw_data(struct mtd_info *mtd, uint8_t *buf, loff_t offs, |
280 | struct nand_bbt_descr *td) | |
281 | { | |
282 | size_t retlen; | |
283 | size_t len; | |
284 | ||
285 | len = td->len; | |
286 | if (td->options & NAND_BBT_VERSION) | |
287 | len++; | |
288 | ||
329ad399 | 289 | return mtd_read(mtd, offs, len, &retlen, buf); |
7cba7b14 SAS |
290 | } |
291 | ||
8b6e50c9 | 292 | /* Scan read raw data from flash */ |
7cba7b14 | 293 | static int scan_read_raw_oob(struct mtd_info *mtd, uint8_t *buf, loff_t offs, |
8593fbc6 TG |
294 | size_t len) |
295 | { | |
296 | struct mtd_oob_ops ops; | |
b64d39d8 | 297 | int res; |
8593fbc6 | 298 | |
0612b9dd | 299 | ops.mode = MTD_OPS_RAW; |
8593fbc6 TG |
300 | ops.ooboffs = 0; |
301 | ops.ooblen = mtd->oobsize; | |
8593fbc6 | 302 | |
b64d39d8 | 303 | while (len > 0) { |
105513cc BN |
304 | ops.datbuf = buf; |
305 | ops.len = min(len, (size_t)mtd->writesize); | |
306 | ops.oobbuf = buf + ops.len; | |
b64d39d8 | 307 | |
fd2819bb | 308 | res = mtd_read_oob(mtd, offs, &ops); |
b64d39d8 | 309 | |
afa17de2 | 310 | if (res) |
105513cc | 311 | return res; |
b64d39d8 ML |
312 | |
313 | buf += mtd->oobsize + mtd->writesize; | |
314 | len -= mtd->writesize; | |
34a5704d | 315 | offs += mtd->writesize; |
b64d39d8 ML |
316 | } |
317 | return 0; | |
8593fbc6 TG |
318 | } |
319 | ||
7cba7b14 SAS |
320 | static int scan_read_raw(struct mtd_info *mtd, uint8_t *buf, loff_t offs, |
321 | size_t len, struct nand_bbt_descr *td) | |
322 | { | |
323 | if (td->options & NAND_BBT_NO_OOB) | |
324 | return scan_read_raw_data(mtd, buf, offs, td); | |
325 | else | |
326 | return scan_read_raw_oob(mtd, buf, offs, len); | |
327 | } | |
328 | ||
8b6e50c9 | 329 | /* Scan write data with oob to flash */ |
8593fbc6 TG |
330 | static int scan_write_bbt(struct mtd_info *mtd, loff_t offs, size_t len, |
331 | uint8_t *buf, uint8_t *oob) | |
332 | { | |
333 | struct mtd_oob_ops ops; | |
334 | ||
0612b9dd | 335 | ops.mode = MTD_OPS_PLACE_OOB; |
8593fbc6 TG |
336 | ops.ooboffs = 0; |
337 | ops.ooblen = mtd->oobsize; | |
338 | ops.datbuf = buf; | |
339 | ops.oobbuf = oob; | |
340 | ops.len = len; | |
341 | ||
a2cc5ba0 | 342 | return mtd_write_oob(mtd, offs, &ops); |
8593fbc6 TG |
343 | } |
344 | ||
7cba7b14 SAS |
345 | static u32 bbt_get_ver_offs(struct mtd_info *mtd, struct nand_bbt_descr *td) |
346 | { | |
347 | u32 ver_offs = td->veroffs; | |
348 | ||
349 | if (!(td->options & NAND_BBT_NO_OOB)) | |
350 | ver_offs += mtd->writesize; | |
351 | return ver_offs; | |
352 | } | |
353 | ||
1da177e4 LT |
354 | /** |
355 | * read_abs_bbts - [GENERIC] Read the bad block table(s) for all chips starting at a given page | |
8b6e50c9 BN |
356 | * @mtd: MTD device structure |
357 | * @buf: temporary buffer | |
358 | * @td: descriptor for the bad block table | |
359 | * @md: descriptor for the bad block table mirror | |
1da177e4 | 360 | * |
8b6e50c9 BN |
361 | * Read the bad block table(s) for all chips starting at a given page. We |
362 | * assume that the bbt bits are in consecutive order. | |
363 | */ | |
7b5a2d40 BN |
364 | static void read_abs_bbts(struct mtd_info *mtd, uint8_t *buf, |
365 | struct nand_bbt_descr *td, struct nand_bbt_descr *md) | |
1da177e4 LT |
366 | { |
367 | struct nand_chip *this = mtd->priv; | |
368 | ||
61b03bd7 | 369 | /* Read the primary version, if available */ |
1da177e4 | 370 | if (td->options & NAND_BBT_VERSION) { |
69423d99 | 371 | scan_read_raw(mtd, buf, (loff_t)td->pages[0] << this->page_shift, |
7cba7b14 SAS |
372 | mtd->writesize, td); |
373 | td->version[0] = buf[bbt_get_ver_offs(mtd, td)]; | |
9a4d4d69 | 374 | pr_info("Bad block table at page %d, version 0x%02X\n", |
d0370219 | 375 | td->pages[0], td->version[0]); |
1da177e4 LT |
376 | } |
377 | ||
61b03bd7 | 378 | /* Read the mirror version, if available */ |
1da177e4 | 379 | if (md && (md->options & NAND_BBT_VERSION)) { |
69423d99 | 380 | scan_read_raw(mtd, buf, (loff_t)md->pages[0] << this->page_shift, |
7bb9c754 | 381 | mtd->writesize, md); |
7cba7b14 | 382 | md->version[0] = buf[bbt_get_ver_offs(mtd, md)]; |
9a4d4d69 | 383 | pr_info("Bad block table at page %d, version 0x%02X\n", |
d0370219 | 384 | md->pages[0], md->version[0]); |
1da177e4 | 385 | } |
1da177e4 LT |
386 | } |
387 | ||
8b6e50c9 | 388 | /* Scan a given block full */ |
8593fbc6 TG |
389 | static int scan_block_full(struct mtd_info *mtd, struct nand_bbt_descr *bd, |
390 | loff_t offs, uint8_t *buf, size_t readlen, | |
391 | int scanlen, int len) | |
392 | { | |
393 | int ret, j; | |
394 | ||
7cba7b14 | 395 | ret = scan_read_raw_oob(mtd, buf, offs, readlen); |
afa17de2 | 396 | /* Ignore ECC errors when checking for BBM */ |
d57f4054 | 397 | if (ret && !mtd_is_bitflip_or_eccerr(ret)) |
8593fbc6 TG |
398 | return ret; |
399 | ||
400 | for (j = 0; j < len; j++, buf += scanlen) { | |
401 | if (check_pattern(buf, scanlen, mtd->writesize, bd)) | |
402 | return 1; | |
403 | } | |
404 | return 0; | |
405 | } | |
406 | ||
8b6e50c9 | 407 | /* Scan a given block partially */ |
8593fbc6 TG |
408 | static int scan_block_fast(struct mtd_info *mtd, struct nand_bbt_descr *bd, |
409 | loff_t offs, uint8_t *buf, int len) | |
410 | { | |
411 | struct mtd_oob_ops ops; | |
412 | int j, ret; | |
413 | ||
8593fbc6 TG |
414 | ops.ooblen = mtd->oobsize; |
415 | ops.oobbuf = buf; | |
416 | ops.ooboffs = 0; | |
417 | ops.datbuf = NULL; | |
0612b9dd | 418 | ops.mode = MTD_OPS_PLACE_OOB; |
8593fbc6 TG |
419 | |
420 | for (j = 0; j < len; j++) { | |
421 | /* | |
8b6e50c9 BN |
422 | * Read the full oob until read_oob is fixed to handle single |
423 | * byte reads for 16 bit buswidth. | |
8593fbc6 | 424 | */ |
fd2819bb | 425 | ret = mtd_read_oob(mtd, offs, &ops); |
903cd06c | 426 | /* Ignore ECC errors when checking for BBM */ |
d57f4054 | 427 | if (ret && !mtd_is_bitflip_or_eccerr(ret)) |
8593fbc6 TG |
428 | return ret; |
429 | ||
430 | if (check_short_pattern(buf, bd)) | |
431 | return 1; | |
432 | ||
433 | offs += mtd->writesize; | |
434 | } | |
435 | return 0; | |
436 | } | |
437 | ||
1da177e4 LT |
438 | /** |
439 | * create_bbt - [GENERIC] Create a bad block table by scanning the device | |
8b6e50c9 BN |
440 | * @mtd: MTD device structure |
441 | * @buf: temporary buffer | |
442 | * @bd: descriptor for the good/bad block search pattern | |
443 | * @chip: create the table for a specific chip, -1 read all chips; applies only | |
444 | * if NAND_BBT_PERCHIP option is set | |
1da177e4 | 445 | * |
8b6e50c9 BN |
446 | * Create a bad block table by scanning the device for the given good/bad block |
447 | * identify pattern. | |
1da177e4 | 448 | */ |
8593fbc6 TG |
449 | static int create_bbt(struct mtd_info *mtd, uint8_t *buf, |
450 | struct nand_bbt_descr *bd, int chip) | |
1da177e4 LT |
451 | { |
452 | struct nand_chip *this = mtd->priv; | |
8593fbc6 | 453 | int i, numblocks, len, scanlen; |
1da177e4 LT |
454 | int startblock; |
455 | loff_t from; | |
8593fbc6 | 456 | size_t readlen; |
1da177e4 | 457 | |
9a4d4d69 | 458 | pr_info("Scanning device for bad blocks\n"); |
1da177e4 LT |
459 | |
460 | if (bd->options & NAND_BBT_SCANALLPAGES) | |
461 | len = 1 << (this->bbt_erase_shift - this->page_shift); | |
58373ff0 BN |
462 | else if (bd->options & NAND_BBT_SCAN2NDPAGE) |
463 | len = 2; | |
464 | else | |
465 | len = 1; | |
171650af AB |
466 | |
467 | if (!(bd->options & NAND_BBT_SCANEMPTY)) { | |
468 | /* We need only read few bytes from the OOB area */ | |
8593fbc6 | 469 | scanlen = 0; |
eeada24d AB |
470 | readlen = bd->len; |
471 | } else { | |
171650af | 472 | /* Full page content should be read */ |
28318776 JE |
473 | scanlen = mtd->writesize + mtd->oobsize; |
474 | readlen = len * mtd->writesize; | |
eeada24d | 475 | } |
1da177e4 LT |
476 | |
477 | if (chip == -1) { | |
8b6e50c9 BN |
478 | /* |
479 | * Note that numblocks is 2 * (real numblocks) here, see i+=2 | |
480 | * below as it makes shifting and masking less painful | |
481 | */ | |
1da177e4 LT |
482 | numblocks = mtd->size >> (this->bbt_erase_shift - 1); |
483 | startblock = 0; | |
484 | from = 0; | |
485 | } else { | |
486 | if (chip >= this->numchips) { | |
9a4d4d69 | 487 | pr_warn("create_bbt(): chipnr (%d) > available chips (%d)\n", |
e0c7d767 | 488 | chip + 1, this->numchips); |
171650af | 489 | return -EINVAL; |
1da177e4 LT |
490 | } |
491 | numblocks = this->chipsize >> (this->bbt_erase_shift - 1); | |
492 | startblock = chip * numblocks; | |
493 | numblocks += startblock; | |
69423d99 | 494 | from = (loff_t)startblock << (this->bbt_erase_shift - 1); |
1da177e4 | 495 | } |
61b03bd7 | 496 | |
5fb1549d | 497 | if (this->bbt_options & NAND_BBT_SCANLASTPAGE) |
b60b08b0 KC |
498 | from += mtd->erasesize - (mtd->writesize * len); |
499 | ||
1da177e4 | 500 | for (i = startblock; i < numblocks;) { |
eeada24d | 501 | int ret; |
61b03bd7 | 502 | |
7cba7b14 SAS |
503 | BUG_ON(bd->options & NAND_BBT_NO_OOB); |
504 | ||
8593fbc6 TG |
505 | if (bd->options & NAND_BBT_SCANALLPAGES) |
506 | ret = scan_block_full(mtd, bd, from, buf, readlen, | |
507 | scanlen, len); | |
508 | else | |
509 | ret = scan_block_fast(mtd, bd, from, buf, len); | |
510 | ||
511 | if (ret < 0) | |
512 | return ret; | |
513 | ||
514 | if (ret) { | |
515 | this->bbt[i >> 3] |= 0x03 << (i & 0x6); | |
9a4d4d69 | 516 | pr_warn("Bad eraseblock %d at 0x%012llx\n", |
d0370219 | 517 | i >> 1, (unsigned long long)from); |
f1a28c02 | 518 | mtd->ecc_stats.badblocks++; |
1da177e4 | 519 | } |
8593fbc6 | 520 | |
1da177e4 LT |
521 | i += 2; |
522 | from += (1 << this->bbt_erase_shift); | |
523 | } | |
eeada24d | 524 | return 0; |
1da177e4 LT |
525 | } |
526 | ||
527 | /** | |
528 | * search_bbt - [GENERIC] scan the device for a specific bad block table | |
8b6e50c9 BN |
529 | * @mtd: MTD device structure |
530 | * @buf: temporary buffer | |
531 | * @td: descriptor for the bad block table | |
1da177e4 | 532 | * |
8b6e50c9 BN |
533 | * Read the bad block table by searching for a given ident pattern. Search is |
534 | * preformed either from the beginning up or from the end of the device | |
535 | * downwards. The search starts always at the start of a block. If the option | |
536 | * NAND_BBT_PERCHIP is given, each chip is searched for a bbt, which contains | |
537 | * the bad block information of this chip. This is necessary to provide support | |
538 | * for certain DOC devices. | |
1da177e4 | 539 | * |
8b6e50c9 | 540 | * The bbt ident pattern resides in the oob area of the first page in a block. |
1da177e4 | 541 | */ |
e0c7d767 | 542 | static int search_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td) |
1da177e4 LT |
543 | { |
544 | struct nand_chip *this = mtd->priv; | |
545 | int i, chips; | |
546 | int bits, startblock, block, dir; | |
28318776 | 547 | int scanlen = mtd->writesize + mtd->oobsize; |
1da177e4 | 548 | int bbtblocks; |
8593fbc6 | 549 | int blocktopage = this->bbt_erase_shift - this->page_shift; |
1da177e4 | 550 | |
8b6e50c9 | 551 | /* Search direction top -> down? */ |
1da177e4 | 552 | if (td->options & NAND_BBT_LASTBLOCK) { |
e0c7d767 | 553 | startblock = (mtd->size >> this->bbt_erase_shift) - 1; |
1da177e4 LT |
554 | dir = -1; |
555 | } else { | |
61b03bd7 | 556 | startblock = 0; |
1da177e4 | 557 | dir = 1; |
61b03bd7 TG |
558 | } |
559 | ||
8b6e50c9 | 560 | /* Do we have a bbt per chip? */ |
1da177e4 LT |
561 | if (td->options & NAND_BBT_PERCHIP) { |
562 | chips = this->numchips; | |
563 | bbtblocks = this->chipsize >> this->bbt_erase_shift; | |
564 | startblock &= bbtblocks - 1; | |
565 | } else { | |
566 | chips = 1; | |
567 | bbtblocks = mtd->size >> this->bbt_erase_shift; | |
568 | } | |
61b03bd7 | 569 | |
1da177e4 LT |
570 | /* Number of bits for each erase block in the bbt */ |
571 | bits = td->options & NAND_BBT_NRBITS_MSK; | |
61b03bd7 | 572 | |
1da177e4 LT |
573 | for (i = 0; i < chips; i++) { |
574 | /* Reset version information */ | |
61b03bd7 | 575 | td->version[i] = 0; |
1da177e4 LT |
576 | td->pages[i] = -1; |
577 | /* Scan the maximum number of blocks */ | |
578 | for (block = 0; block < td->maxblocks; block++) { | |
8593fbc6 | 579 | |
1da177e4 | 580 | int actblock = startblock + dir * block; |
69423d99 | 581 | loff_t offs = (loff_t)actblock << this->bbt_erase_shift; |
8593fbc6 | 582 | |
1da177e4 | 583 | /* Read first page */ |
7cba7b14 | 584 | scan_read_raw(mtd, buf, offs, mtd->writesize, td); |
28318776 | 585 | if (!check_pattern(buf, scanlen, mtd->writesize, td)) { |
8593fbc6 | 586 | td->pages[i] = actblock << blocktopage; |
1da177e4 | 587 | if (td->options & NAND_BBT_VERSION) { |
7cba7b14 SAS |
588 | offs = bbt_get_ver_offs(mtd, td); |
589 | td->version[i] = buf[offs]; | |
1da177e4 LT |
590 | } |
591 | break; | |
592 | } | |
593 | } | |
594 | startblock += this->chipsize >> this->bbt_erase_shift; | |
595 | } | |
596 | /* Check, if we found a bbt for each requested chip */ | |
597 | for (i = 0; i < chips; i++) { | |
598 | if (td->pages[i] == -1) | |
9a4d4d69 | 599 | pr_warn("Bad block table not found for chip %d\n", i); |
1da177e4 | 600 | else |
d0370219 BN |
601 | pr_info("Bad block table found at page %d, version " |
602 | "0x%02X\n", td->pages[i], td->version[i]); | |
1da177e4 | 603 | } |
61b03bd7 | 604 | return 0; |
1da177e4 LT |
605 | } |
606 | ||
607 | /** | |
608 | * search_read_bbts - [GENERIC] scan the device for bad block table(s) | |
8b6e50c9 BN |
609 | * @mtd: MTD device structure |
610 | * @buf: temporary buffer | |
611 | * @td: descriptor for the bad block table | |
612 | * @md: descriptor for the bad block table mirror | |
1da177e4 | 613 | * |
8b6e50c9 BN |
614 | * Search and read the bad block table(s). |
615 | */ | |
7b5a2d40 BN |
616 | static void search_read_bbts(struct mtd_info *mtd, uint8_t *buf, |
617 | struct nand_bbt_descr *td, | |
618 | struct nand_bbt_descr *md) | |
1da177e4 LT |
619 | { |
620 | /* Search the primary table */ | |
e0c7d767 | 621 | search_bbt(mtd, buf, td); |
61b03bd7 | 622 | |
1da177e4 LT |
623 | /* Search the mirror table */ |
624 | if (md) | |
e0c7d767 | 625 | search_bbt(mtd, buf, md); |
1da177e4 | 626 | } |
1da177e4 | 627 | |
61b03bd7 | 628 | /** |
1da177e4 | 629 | * write_bbt - [GENERIC] (Re)write the bad block table |
8b6e50c9 BN |
630 | * @mtd: MTD device structure |
631 | * @buf: temporary buffer | |
632 | * @td: descriptor for the bad block table | |
633 | * @md: descriptor for the bad block table mirror | |
634 | * @chipsel: selector for a specific chip, -1 for all | |
1da177e4 | 635 | * |
8b6e50c9 BN |
636 | * (Re)write the bad block table. |
637 | */ | |
e0c7d767 | 638 | static int write_bbt(struct mtd_info *mtd, uint8_t *buf, |
9223a456 TG |
639 | struct nand_bbt_descr *td, struct nand_bbt_descr *md, |
640 | int chipsel) | |
1da177e4 LT |
641 | { |
642 | struct nand_chip *this = mtd->priv; | |
1da177e4 LT |
643 | struct erase_info einfo; |
644 | int i, j, res, chip = 0; | |
645 | int bits, startblock, dir, page, offs, numblocks, sft, sftmsk; | |
9223a456 | 646 | int nrchips, bbtoffs, pageoffs, ooboffs; |
1da177e4 LT |
647 | uint8_t msk[4]; |
648 | uint8_t rcode = td->reserved_block_code; | |
8593fbc6 | 649 | size_t retlen, len = 0; |
1da177e4 | 650 | loff_t to; |
8593fbc6 TG |
651 | struct mtd_oob_ops ops; |
652 | ||
653 | ops.ooblen = mtd->oobsize; | |
654 | ops.ooboffs = 0; | |
655 | ops.datbuf = NULL; | |
0612b9dd | 656 | ops.mode = MTD_OPS_PLACE_OOB; |
1da177e4 LT |
657 | |
658 | if (!rcode) | |
659 | rcode = 0xff; | |
8b6e50c9 | 660 | /* Write bad block table per chip rather than per device? */ |
1da177e4 | 661 | if (td->options & NAND_BBT_PERCHIP) { |
e0c7d767 | 662 | numblocks = (int)(this->chipsize >> this->bbt_erase_shift); |
8b6e50c9 | 663 | /* Full device write or specific chip? */ |
1da177e4 LT |
664 | if (chipsel == -1) { |
665 | nrchips = this->numchips; | |
666 | } else { | |
667 | nrchips = chipsel + 1; | |
668 | chip = chipsel; | |
669 | } | |
670 | } else { | |
e0c7d767 | 671 | numblocks = (int)(mtd->size >> this->bbt_erase_shift); |
1da177e4 | 672 | nrchips = 1; |
61b03bd7 TG |
673 | } |
674 | ||
1da177e4 LT |
675 | /* Loop through the chips */ |
676 | for (; chip < nrchips; chip++) { | |
8b6e50c9 BN |
677 | /* |
678 | * There was already a version of the table, reuse the page | |
61b03bd7 | 679 | * This applies for absolute placement too, as we have the |
1da177e4 LT |
680 | * page nr. in td->pages. |
681 | */ | |
682 | if (td->pages[chip] != -1) { | |
683 | page = td->pages[chip]; | |
684 | goto write; | |
61b03bd7 | 685 | } |
1da177e4 | 686 | |
8b6e50c9 BN |
687 | /* |
688 | * Automatic placement of the bad block table. Search direction | |
689 | * top -> down? | |
690 | */ | |
1da177e4 LT |
691 | if (td->options & NAND_BBT_LASTBLOCK) { |
692 | startblock = numblocks * (chip + 1) - 1; | |
693 | dir = -1; | |
694 | } else { | |
695 | startblock = chip * numblocks; | |
696 | dir = 1; | |
61b03bd7 | 697 | } |
1da177e4 LT |
698 | |
699 | for (i = 0; i < td->maxblocks; i++) { | |
700 | int block = startblock + dir * i; | |
701 | /* Check, if the block is bad */ | |
9223a456 TG |
702 | switch ((this->bbt[block >> 2] >> |
703 | (2 * (block & 0x03))) & 0x03) { | |
1da177e4 LT |
704 | case 0x01: |
705 | case 0x03: | |
706 | continue; | |
707 | } | |
9223a456 TG |
708 | page = block << |
709 | (this->bbt_erase_shift - this->page_shift); | |
1da177e4 LT |
710 | /* Check, if the block is used by the mirror table */ |
711 | if (!md || md->pages[chip] != page) | |
712 | goto write; | |
713 | } | |
9a4d4d69 | 714 | pr_err("No space left to write bad block table\n"); |
1da177e4 | 715 | return -ENOSPC; |
e0c7d767 | 716 | write: |
1da177e4 LT |
717 | |
718 | /* Set up shift count and masks for the flash table */ | |
719 | bits = td->options & NAND_BBT_NRBITS_MSK; | |
9223a456 | 720 | msk[2] = ~rcode; |
1da177e4 | 721 | switch (bits) { |
9223a456 TG |
722 | case 1: sft = 3; sftmsk = 0x07; msk[0] = 0x00; msk[1] = 0x01; |
723 | msk[3] = 0x01; | |
724 | break; | |
725 | case 2: sft = 2; sftmsk = 0x06; msk[0] = 0x00; msk[1] = 0x01; | |
726 | msk[3] = 0x03; | |
727 | break; | |
728 | case 4: sft = 1; sftmsk = 0x04; msk[0] = 0x00; msk[1] = 0x0C; | |
729 | msk[3] = 0x0f; | |
730 | break; | |
731 | case 8: sft = 0; sftmsk = 0x00; msk[0] = 0x00; msk[1] = 0x0F; | |
732 | msk[3] = 0xff; | |
733 | break; | |
1da177e4 LT |
734 | default: return -EINVAL; |
735 | } | |
61b03bd7 | 736 | |
1da177e4 | 737 | bbtoffs = chip * (numblocks >> 2); |
61b03bd7 | 738 | |
596d7452 | 739 | to = ((loff_t)page) << this->page_shift; |
1da177e4 | 740 | |
8b6e50c9 | 741 | /* Must we save the block contents? */ |
1da177e4 LT |
742 | if (td->options & NAND_BBT_SAVECONTENT) { |
743 | /* Make it block aligned */ | |
596d7452 | 744 | to &= ~((loff_t)((1 << this->bbt_erase_shift) - 1)); |
1da177e4 | 745 | len = 1 << this->bbt_erase_shift; |
329ad399 | 746 | res = mtd_read(mtd, to, len, &retlen, buf); |
1da177e4 LT |
747 | if (res < 0) { |
748 | if (retlen != len) { | |
d0370219 BN |
749 | pr_info("nand_bbt: error reading block " |
750 | "for writing the bad block table\n"); | |
1da177e4 LT |
751 | return res; |
752 | } | |
d0370219 BN |
753 | pr_warn("nand_bbt: ECC error while reading " |
754 | "block for writing bad block table\n"); | |
1da177e4 | 755 | } |
9223a456 | 756 | /* Read oob data */ |
7014568b | 757 | ops.ooblen = (len >> this->page_shift) * mtd->oobsize; |
8593fbc6 | 758 | ops.oobbuf = &buf[len]; |
fd2819bb | 759 | res = mtd_read_oob(mtd, to + mtd->writesize, &ops); |
7014568b | 760 | if (res < 0 || ops.oobretlen != ops.ooblen) |
9223a456 TG |
761 | goto outerr; |
762 | ||
1da177e4 LT |
763 | /* Calc the byte offset in the buffer */ |
764 | pageoffs = page - (int)(to >> this->page_shift); | |
765 | offs = pageoffs << this->page_shift; | |
766 | /* Preset the bbt area with 0xff */ | |
596d7452 | 767 | memset(&buf[offs], 0xff, (size_t)(numblocks >> sft)); |
9223a456 TG |
768 | ooboffs = len + (pageoffs * mtd->oobsize); |
769 | ||
7cba7b14 SAS |
770 | } else if (td->options & NAND_BBT_NO_OOB) { |
771 | ooboffs = 0; | |
772 | offs = td->len; | |
8b6e50c9 | 773 | /* The version byte */ |
7cba7b14 SAS |
774 | if (td->options & NAND_BBT_VERSION) |
775 | offs++; | |
776 | /* Calc length */ | |
596d7452 | 777 | len = (size_t)(numblocks >> sft); |
7cba7b14 | 778 | len += offs; |
8b6e50c9 | 779 | /* Make it page aligned! */ |
7cba7b14 SAS |
780 | len = ALIGN(len, mtd->writesize); |
781 | /* Preset the buffer with 0xff */ | |
782 | memset(buf, 0xff, len); | |
783 | /* Pattern is located at the begin of first page */ | |
784 | memcpy(buf, td->pattern, td->len); | |
1da177e4 LT |
785 | } else { |
786 | /* Calc length */ | |
596d7452 | 787 | len = (size_t)(numblocks >> sft); |
8b6e50c9 | 788 | /* Make it page aligned! */ |
cda32091 | 789 | len = ALIGN(len, mtd->writesize); |
1da177e4 | 790 | /* Preset the buffer with 0xff */ |
9223a456 TG |
791 | memset(buf, 0xff, len + |
792 | (len >> this->page_shift)* mtd->oobsize); | |
1da177e4 | 793 | offs = 0; |
9223a456 | 794 | ooboffs = len; |
1da177e4 | 795 | /* Pattern is located in oob area of first page */ |
9223a456 | 796 | memcpy(&buf[ooboffs + td->offs], td->pattern, td->len); |
1da177e4 | 797 | } |
61b03bd7 | 798 | |
9223a456 TG |
799 | if (td->options & NAND_BBT_VERSION) |
800 | buf[ooboffs + td->veroffs] = td->version[chip]; | |
801 | ||
8b6e50c9 | 802 | /* Walk through the memory table */ |
e0c7d767 | 803 | for (i = 0; i < numblocks;) { |
1da177e4 LT |
804 | uint8_t dat; |
805 | dat = this->bbt[bbtoffs + (i >> 2)]; | |
e0c7d767 | 806 | for (j = 0; j < 4; j++, i++) { |
1da177e4 | 807 | int sftcnt = (i << (3 - sft)) & sftmsk; |
8b6e50c9 | 808 | /* Do not store the reserved bbt blocks! */ |
9223a456 TG |
809 | buf[offs + (i >> sft)] &= |
810 | ~(msk[dat & 0x03] << sftcnt); | |
1da177e4 LT |
811 | dat >>= 2; |
812 | } | |
813 | } | |
61b03bd7 | 814 | |
e0c7d767 | 815 | memset(&einfo, 0, sizeof(einfo)); |
1da177e4 | 816 | einfo.mtd = mtd; |
69423d99 | 817 | einfo.addr = to; |
1da177e4 | 818 | einfo.len = 1 << this->bbt_erase_shift; |
e0c7d767 | 819 | res = nand_erase_nand(mtd, &einfo, 1); |
9223a456 TG |
820 | if (res < 0) |
821 | goto outerr; | |
61b03bd7 | 822 | |
7cba7b14 SAS |
823 | res = scan_write_bbt(mtd, to, len, buf, |
824 | td->options & NAND_BBT_NO_OOB ? NULL : | |
825 | &buf[len]); | |
9223a456 TG |
826 | if (res < 0) |
827 | goto outerr; | |
828 | ||
d0370219 BN |
829 | pr_info("Bad block table written to 0x%012llx, version 0x%02X\n", |
830 | (unsigned long long)to, td->version[chip]); | |
61b03bd7 | 831 | |
1da177e4 LT |
832 | /* Mark it as used */ |
833 | td->pages[chip] = page; | |
61b03bd7 | 834 | } |
1da177e4 | 835 | return 0; |
9223a456 TG |
836 | |
837 | outerr: | |
d0370219 | 838 | pr_warn("nand_bbt: error while writing bad block table %d\n", res); |
9223a456 | 839 | return res; |
1da177e4 LT |
840 | } |
841 | ||
842 | /** | |
843 | * nand_memory_bbt - [GENERIC] create a memory based bad block table | |
8b6e50c9 BN |
844 | * @mtd: MTD device structure |
845 | * @bd: descriptor for the good/bad block search pattern | |
1da177e4 | 846 | * |
8b6e50c9 BN |
847 | * The function creates a memory based bbt by scanning the device for |
848 | * manufacturer / software marked good / bad blocks. | |
849 | */ | |
e0c7d767 | 850 | static inline int nand_memory_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd) |
1da177e4 LT |
851 | { |
852 | struct nand_chip *this = mtd->priv; | |
853 | ||
171650af | 854 | bd->options &= ~NAND_BBT_SCANEMPTY; |
4bf63fcb | 855 | return create_bbt(mtd, this->buffers->databuf, bd, -1); |
1da177e4 LT |
856 | } |
857 | ||
858 | /** | |
e0c7d767 | 859 | * check_create - [GENERIC] create and write bbt(s) if necessary |
8b6e50c9 BN |
860 | * @mtd: MTD device structure |
861 | * @buf: temporary buffer | |
862 | * @bd: descriptor for the good/bad block search pattern | |
1da177e4 | 863 | * |
8b6e50c9 BN |
864 | * The function checks the results of the previous call to read_bbt and creates |
865 | * / updates the bbt(s) if necessary. Creation is necessary if no bbt was found | |
866 | * for the chip/device. Update is necessary if one of the tables is missing or | |
867 | * the version nr. of one table is less than the other. | |
868 | */ | |
e0c7d767 | 869 | static int check_create(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *bd) |
1da177e4 | 870 | { |
623978de | 871 | int i, chips, writeops, create, chipsel, res, res2; |
1da177e4 LT |
872 | struct nand_chip *this = mtd->priv; |
873 | struct nand_bbt_descr *td = this->bbt_td; | |
874 | struct nand_bbt_descr *md = this->bbt_md; | |
875 | struct nand_bbt_descr *rd, *rd2; | |
876 | ||
8b6e50c9 | 877 | /* Do we have a bbt per chip? */ |
61b03bd7 | 878 | if (td->options & NAND_BBT_PERCHIP) |
1da177e4 | 879 | chips = this->numchips; |
61b03bd7 | 880 | else |
1da177e4 | 881 | chips = 1; |
61b03bd7 | 882 | |
1da177e4 LT |
883 | for (i = 0; i < chips; i++) { |
884 | writeops = 0; | |
b61bf5bb | 885 | create = 0; |
1da177e4 LT |
886 | rd = NULL; |
887 | rd2 = NULL; | |
623978de | 888 | res = res2 = 0; |
8b6e50c9 | 889 | /* Per chip or per device? */ |
1da177e4 | 890 | chipsel = (td->options & NAND_BBT_PERCHIP) ? i : -1; |
8b6e50c9 | 891 | /* Mirrored table available? */ |
1da177e4 LT |
892 | if (md) { |
893 | if (td->pages[i] == -1 && md->pages[i] == -1) { | |
b61bf5bb | 894 | create = 1; |
1da177e4 | 895 | writeops = 0x03; |
c5e8ef9c | 896 | } else if (td->pages[i] == -1) { |
61b03bd7 | 897 | rd = md; |
596d7452 | 898 | writeops = 0x01; |
c5e8ef9c | 899 | } else if (md->pages[i] == -1) { |
1da177e4 | 900 | rd = td; |
596d7452 | 901 | writeops = 0x02; |
c5e8ef9c | 902 | } else if (td->version[i] == md->version[i]) { |
1da177e4 LT |
903 | rd = td; |
904 | if (!(td->options & NAND_BBT_VERSION)) | |
905 | rd2 = md; | |
c5e8ef9c | 906 | } else if (((int8_t)(td->version[i] - md->version[i])) > 0) { |
1da177e4 | 907 | rd = td; |
596d7452 | 908 | writeops = 0x02; |
1da177e4 LT |
909 | } else { |
910 | rd = md; | |
596d7452 | 911 | writeops = 0x01; |
1da177e4 | 912 | } |
1da177e4 LT |
913 | } else { |
914 | if (td->pages[i] == -1) { | |
b61bf5bb | 915 | create = 1; |
1da177e4 | 916 | writeops = 0x01; |
b61bf5bb BN |
917 | } else { |
918 | rd = td; | |
1da177e4 | 919 | } |
1da177e4 | 920 | } |
61b03bd7 | 921 | |
b61bf5bb BN |
922 | if (create) { |
923 | /* Create the bad block table by scanning the device? */ | |
924 | if (!(td->options & NAND_BBT_CREATE)) | |
925 | continue; | |
926 | ||
927 | /* Create the table in memory by scanning the chip(s) */ | |
928 | if (!(this->bbt_options & NAND_BBT_CREATE_EMPTY)) | |
929 | create_bbt(mtd, buf, bd, chipsel); | |
930 | ||
931 | td->version[i] = 1; | |
932 | if (md) | |
933 | md->version[i] = 1; | |
934 | } | |
935 | ||
8b6e50c9 | 936 | /* Read back first? */ |
623978de BN |
937 | if (rd) { |
938 | res = read_abs_bbt(mtd, buf, rd, chipsel); | |
939 | if (mtd_is_eccerr(res)) { | |
940 | /* Mark table as invalid */ | |
941 | rd->pages[i] = -1; | |
dadc17a3 | 942 | rd->version[i] = 0; |
623978de BN |
943 | i--; |
944 | continue; | |
945 | } | |
946 | } | |
8b6e50c9 | 947 | /* If they weren't versioned, read both */ |
623978de BN |
948 | if (rd2) { |
949 | res2 = read_abs_bbt(mtd, buf, rd2, chipsel); | |
950 | if (mtd_is_eccerr(res2)) { | |
951 | /* Mark table as invalid */ | |
952 | rd2->pages[i] = -1; | |
dadc17a3 | 953 | rd2->version[i] = 0; |
623978de BN |
954 | i--; |
955 | continue; | |
956 | } | |
957 | } | |
958 | ||
959 | /* Scrub the flash table(s)? */ | |
960 | if (mtd_is_bitflip(res) || mtd_is_bitflip(res2)) | |
961 | writeops = 0x03; | |
1da177e4 | 962 | |
dadc17a3 BN |
963 | /* Update version numbers before writing */ |
964 | if (md) { | |
965 | td->version[i] = max(td->version[i], md->version[i]); | |
966 | md->version[i] = td->version[i]; | |
967 | } | |
968 | ||
8b6e50c9 | 969 | /* Write the bad block table to the device? */ |
1da177e4 | 970 | if ((writeops & 0x01) && (td->options & NAND_BBT_WRITE)) { |
e0c7d767 | 971 | res = write_bbt(mtd, buf, td, md, chipsel); |
1da177e4 LT |
972 | if (res < 0) |
973 | return res; | |
974 | } | |
61b03bd7 | 975 | |
8b6e50c9 | 976 | /* Write the mirror bad block table to the device? */ |
1da177e4 | 977 | if ((writeops & 0x02) && md && (md->options & NAND_BBT_WRITE)) { |
e0c7d767 | 978 | res = write_bbt(mtd, buf, md, td, chipsel); |
1da177e4 LT |
979 | if (res < 0) |
980 | return res; | |
981 | } | |
982 | } | |
61b03bd7 | 983 | return 0; |
1da177e4 LT |
984 | } |
985 | ||
986 | /** | |
61b03bd7 | 987 | * mark_bbt_regions - [GENERIC] mark the bad block table regions |
8b6e50c9 BN |
988 | * @mtd: MTD device structure |
989 | * @td: bad block table descriptor | |
1da177e4 | 990 | * |
8b6e50c9 BN |
991 | * The bad block table regions are marked as "bad" to prevent accidental |
992 | * erasures / writes. The regions are identified by the mark 0x02. | |
993 | */ | |
e0c7d767 | 994 | static void mark_bbt_region(struct mtd_info *mtd, struct nand_bbt_descr *td) |
1da177e4 LT |
995 | { |
996 | struct nand_chip *this = mtd->priv; | |
997 | int i, j, chips, block, nrblocks, update; | |
998 | uint8_t oldval, newval; | |
999 | ||
8b6e50c9 | 1000 | /* Do we have a bbt per chip? */ |
1da177e4 LT |
1001 | if (td->options & NAND_BBT_PERCHIP) { |
1002 | chips = this->numchips; | |
1003 | nrblocks = (int)(this->chipsize >> this->bbt_erase_shift); | |
1004 | } else { | |
1005 | chips = 1; | |
1006 | nrblocks = (int)(mtd->size >> this->bbt_erase_shift); | |
61b03bd7 TG |
1007 | } |
1008 | ||
1da177e4 LT |
1009 | for (i = 0; i < chips; i++) { |
1010 | if ((td->options & NAND_BBT_ABSPAGE) || | |
1011 | !(td->options & NAND_BBT_WRITE)) { | |
e0c7d767 DW |
1012 | if (td->pages[i] == -1) |
1013 | continue; | |
1da177e4 | 1014 | block = td->pages[i] >> (this->bbt_erase_shift - this->page_shift); |
61b03bd7 | 1015 | block <<= 1; |
1da177e4 LT |
1016 | oldval = this->bbt[(block >> 3)]; |
1017 | newval = oldval | (0x2 << (block & 0x06)); | |
1018 | this->bbt[(block >> 3)] = newval; | |
1019 | if ((oldval != newval) && td->reserved_block_code) | |
69423d99 | 1020 | nand_update_bbt(mtd, (loff_t)block << (this->bbt_erase_shift - 1)); |
1da177e4 LT |
1021 | continue; |
1022 | } | |
1023 | update = 0; | |
1024 | if (td->options & NAND_BBT_LASTBLOCK) | |
1025 | block = ((i + 1) * nrblocks) - td->maxblocks; | |
61b03bd7 | 1026 | else |
1da177e4 | 1027 | block = i * nrblocks; |
61b03bd7 | 1028 | block <<= 1; |
1da177e4 LT |
1029 | for (j = 0; j < td->maxblocks; j++) { |
1030 | oldval = this->bbt[(block >> 3)]; | |
1031 | newval = oldval | (0x2 << (block & 0x06)); | |
1032 | this->bbt[(block >> 3)] = newval; | |
e0c7d767 DW |
1033 | if (oldval != newval) |
1034 | update = 1; | |
1da177e4 | 1035 | block += 2; |
61b03bd7 | 1036 | } |
8b6e50c9 BN |
1037 | /* |
1038 | * If we want reserved blocks to be recorded to flash, and some | |
1039 | * new ones have been marked, then we need to update the stored | |
1040 | * bbts. This should only happen once. | |
1041 | */ | |
1da177e4 | 1042 | if (update && td->reserved_block_code) |
69423d99 | 1043 | nand_update_bbt(mtd, (loff_t)(block - 2) << (this->bbt_erase_shift - 1)); |
1da177e4 LT |
1044 | } |
1045 | } | |
1046 | ||
7cba7b14 SAS |
1047 | /** |
1048 | * verify_bbt_descr - verify the bad block description | |
8b6e50c9 BN |
1049 | * @mtd: MTD device structure |
1050 | * @bd: the table to verify | |
7cba7b14 SAS |
1051 | * |
1052 | * This functions performs a few sanity checks on the bad block description | |
1053 | * table. | |
1054 | */ | |
1055 | static void verify_bbt_descr(struct mtd_info *mtd, struct nand_bbt_descr *bd) | |
1056 | { | |
1057 | struct nand_chip *this = mtd->priv; | |
7912a5e7 SF |
1058 | u32 pattern_len; |
1059 | u32 bits; | |
7cba7b14 SAS |
1060 | u32 table_size; |
1061 | ||
1062 | if (!bd) | |
1063 | return; | |
7912a5e7 SF |
1064 | |
1065 | pattern_len = bd->len; | |
1066 | bits = bd->options & NAND_BBT_NRBITS_MSK; | |
1067 | ||
a40f7341 | 1068 | BUG_ON((this->bbt_options & NAND_BBT_NO_OOB) && |
bb9ebd4e | 1069 | !(this->bbt_options & NAND_BBT_USE_FLASH)); |
7cba7b14 SAS |
1070 | BUG_ON(!bits); |
1071 | ||
1072 | if (bd->options & NAND_BBT_VERSION) | |
1073 | pattern_len++; | |
1074 | ||
1075 | if (bd->options & NAND_BBT_NO_OOB) { | |
bb9ebd4e | 1076 | BUG_ON(!(this->bbt_options & NAND_BBT_USE_FLASH)); |
a40f7341 | 1077 | BUG_ON(!(this->bbt_options & NAND_BBT_NO_OOB)); |
7cba7b14 SAS |
1078 | BUG_ON(bd->offs); |
1079 | if (bd->options & NAND_BBT_VERSION) | |
1080 | BUG_ON(bd->veroffs != bd->len); | |
1081 | BUG_ON(bd->options & NAND_BBT_SAVECONTENT); | |
1082 | } | |
1083 | ||
1084 | if (bd->options & NAND_BBT_PERCHIP) | |
1085 | table_size = this->chipsize >> this->bbt_erase_shift; | |
1086 | else | |
1087 | table_size = mtd->size >> this->bbt_erase_shift; | |
1088 | table_size >>= 3; | |
1089 | table_size *= bits; | |
1090 | if (bd->options & NAND_BBT_NO_OOB) | |
1091 | table_size += pattern_len; | |
1092 | BUG_ON(table_size > (1 << this->bbt_erase_shift)); | |
1093 | } | |
1094 | ||
1da177e4 LT |
1095 | /** |
1096 | * nand_scan_bbt - [NAND Interface] scan, find, read and maybe create bad block table(s) | |
8b6e50c9 BN |
1097 | * @mtd: MTD device structure |
1098 | * @bd: descriptor for the good/bad block search pattern | |
1da177e4 | 1099 | * |
8b6e50c9 BN |
1100 | * The function checks, if a bad block table(s) is/are already available. If |
1101 | * not it scans the device for manufacturer marked good / bad blocks and writes | |
1102 | * the bad block table(s) to the selected place. | |
1da177e4 | 1103 | * |
8b6e50c9 BN |
1104 | * The bad block table memory is allocated here. It must be freed by calling |
1105 | * the nand_free_bbt function. | |
1106 | */ | |
e0c7d767 | 1107 | int nand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd) |
1da177e4 LT |
1108 | { |
1109 | struct nand_chip *this = mtd->priv; | |
1110 | int len, res = 0; | |
1111 | uint8_t *buf; | |
1112 | struct nand_bbt_descr *td = this->bbt_td; | |
1113 | struct nand_bbt_descr *md = this->bbt_md; | |
1114 | ||
1115 | len = mtd->size >> (this->bbt_erase_shift + 2); | |
8b6e50c9 BN |
1116 | /* |
1117 | * Allocate memory (2bit per block) and clear the memory bad block | |
1118 | * table. | |
1119 | */ | |
95b93a0c | 1120 | this->bbt = kzalloc(len, GFP_KERNEL); |
0870066d | 1121 | if (!this->bbt) |
1da177e4 | 1122 | return -ENOMEM; |
1da177e4 | 1123 | |
8b6e50c9 BN |
1124 | /* |
1125 | * If no primary table decriptor is given, scan the device to build a | |
1126 | * memory based bad block table. | |
1da177e4 | 1127 | */ |
eeada24d AB |
1128 | if (!td) { |
1129 | if ((res = nand_memory_bbt(mtd, bd))) { | |
d0370219 | 1130 | pr_err("nand_bbt: can't scan flash and build the RAM-based BBT\n"); |
e0c7d767 | 1131 | kfree(this->bbt); |
eeada24d AB |
1132 | this->bbt = NULL; |
1133 | } | |
1134 | return res; | |
1135 | } | |
7cba7b14 SAS |
1136 | verify_bbt_descr(mtd, td); |
1137 | verify_bbt_descr(mtd, md); | |
1da177e4 LT |
1138 | |
1139 | /* Allocate a temporary buffer for one eraseblock incl. oob */ | |
1140 | len = (1 << this->bbt_erase_shift); | |
1141 | len += (len >> this->page_shift) * mtd->oobsize; | |
c3f8abf4 | 1142 | buf = vmalloc(len); |
1da177e4 | 1143 | if (!buf) { |
e0c7d767 | 1144 | kfree(this->bbt); |
1da177e4 LT |
1145 | this->bbt = NULL; |
1146 | return -ENOMEM; | |
1147 | } | |
61b03bd7 | 1148 | |
8b6e50c9 | 1149 | /* Is the bbt at a given page? */ |
1da177e4 | 1150 | if (td->options & NAND_BBT_ABSPAGE) { |
7b5a2d40 | 1151 | read_abs_bbts(mtd, buf, td, md); |
61b03bd7 | 1152 | } else { |
1da177e4 | 1153 | /* Search the bad block table using a pattern in oob */ |
7b5a2d40 | 1154 | search_read_bbts(mtd, buf, td, md); |
61b03bd7 | 1155 | } |
1da177e4 | 1156 | |
7b5a2d40 | 1157 | res = check_create(mtd, buf, bd); |
61b03bd7 | 1158 | |
1da177e4 | 1159 | /* Prevent the bbt regions from erasing / writing */ |
e0c7d767 | 1160 | mark_bbt_region(mtd, td); |
1da177e4 | 1161 | if (md) |
e0c7d767 | 1162 | mark_bbt_region(mtd, md); |
61b03bd7 | 1163 | |
e0c7d767 | 1164 | vfree(buf); |
1da177e4 LT |
1165 | return res; |
1166 | } | |
1167 | ||
1da177e4 | 1168 | /** |
61b03bd7 | 1169 | * nand_update_bbt - [NAND Interface] update bad block table(s) |
8b6e50c9 BN |
1170 | * @mtd: MTD device structure |
1171 | * @offs: the offset of the newly marked block | |
1da177e4 | 1172 | * |
8b6e50c9 BN |
1173 | * The function updates the bad block table(s). |
1174 | */ | |
e0c7d767 | 1175 | int nand_update_bbt(struct mtd_info *mtd, loff_t offs) |
1da177e4 LT |
1176 | { |
1177 | struct nand_chip *this = mtd->priv; | |
1196ac5a | 1178 | int len, res = 0; |
1da177e4 LT |
1179 | int chip, chipsel; |
1180 | uint8_t *buf; | |
1181 | struct nand_bbt_descr *td = this->bbt_td; | |
1182 | struct nand_bbt_descr *md = this->bbt_md; | |
1183 | ||
1184 | if (!this->bbt || !td) | |
1185 | return -EINVAL; | |
1186 | ||
1da177e4 LT |
1187 | /* Allocate a temporary buffer for one eraseblock incl. oob */ |
1188 | len = (1 << this->bbt_erase_shift); | |
1189 | len += (len >> this->page_shift) * mtd->oobsize; | |
e0c7d767 | 1190 | buf = kmalloc(len, GFP_KERNEL); |
0870066d | 1191 | if (!buf) |
1da177e4 | 1192 | return -ENOMEM; |
1da177e4 | 1193 | |
8b6e50c9 | 1194 | /* Do we have a bbt per chip? */ |
1da177e4 | 1195 | if (td->options & NAND_BBT_PERCHIP) { |
e0c7d767 | 1196 | chip = (int)(offs >> this->chip_shift); |
1da177e4 LT |
1197 | chipsel = chip; |
1198 | } else { | |
1199 | chip = 0; | |
1200 | chipsel = -1; | |
1201 | } | |
1202 | ||
1203 | td->version[chip]++; | |
1204 | if (md) | |
61b03bd7 | 1205 | md->version[chip]++; |
1da177e4 | 1206 | |
8b6e50c9 | 1207 | /* Write the bad block table to the device? */ |
1196ac5a | 1208 | if (td->options & NAND_BBT_WRITE) { |
e0c7d767 | 1209 | res = write_bbt(mtd, buf, td, md, chipsel); |
1da177e4 LT |
1210 | if (res < 0) |
1211 | goto out; | |
1212 | } | |
8b6e50c9 | 1213 | /* Write the mirror bad block table to the device? */ |
1196ac5a | 1214 | if (md && (md->options & NAND_BBT_WRITE)) { |
e0c7d767 | 1215 | res = write_bbt(mtd, buf, md, td, chipsel); |
1da177e4 LT |
1216 | } |
1217 | ||
e0c7d767 DW |
1218 | out: |
1219 | kfree(buf); | |
1da177e4 LT |
1220 | return res; |
1221 | } | |
1222 | ||
8b6e50c9 BN |
1223 | /* |
1224 | * Define some generic bad / good block scan pattern which are used | |
1225 | * while scanning a device for factory marked good / bad blocks. | |
1226 | */ | |
1da177e4 LT |
1227 | static uint8_t scan_ff_pattern[] = { 0xff, 0xff }; |
1228 | ||
1da177e4 LT |
1229 | static uint8_t scan_agand_pattern[] = { 0x1C, 0x71, 0xC7, 0x1C, 0x71, 0xC7 }; |
1230 | ||
1231 | static struct nand_bbt_descr agand_flashbased = { | |
1232 | .options = NAND_BBT_SCANEMPTY | NAND_BBT_SCANALLPAGES, | |
1233 | .offs = 0x20, | |
1234 | .len = 6, | |
1235 | .pattern = scan_agand_pattern | |
1236 | }; | |
1237 | ||
7854d3f7 | 1238 | /* Generic flash bbt descriptors */ |
1da177e4 LT |
1239 | static uint8_t bbt_pattern[] = {'B', 'b', 't', '0' }; |
1240 | static uint8_t mirror_pattern[] = {'1', 't', 'b', 'B' }; | |
1241 | ||
1242 | static struct nand_bbt_descr bbt_main_descr = { | |
61b03bd7 | 1243 | .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
1da177e4 LT |
1244 | | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP, |
1245 | .offs = 8, | |
1246 | .len = 4, | |
1247 | .veroffs = 12, | |
1248 | .maxblocks = 4, | |
1249 | .pattern = bbt_pattern | |
1250 | }; | |
1251 | ||
1252 | static struct nand_bbt_descr bbt_mirror_descr = { | |
61b03bd7 | 1253 | .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
1da177e4 LT |
1254 | | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP, |
1255 | .offs = 8, | |
1256 | .len = 4, | |
1257 | .veroffs = 12, | |
1258 | .maxblocks = 4, | |
1259 | .pattern = mirror_pattern | |
1260 | }; | |
1261 | ||
9fd6b37a | 1262 | static struct nand_bbt_descr bbt_main_no_oob_descr = { |
7cba7b14 SAS |
1263 | .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
1264 | | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP | |
1265 | | NAND_BBT_NO_OOB, | |
1266 | .len = 4, | |
1267 | .veroffs = 4, | |
1268 | .maxblocks = 4, | |
1269 | .pattern = bbt_pattern | |
1270 | }; | |
1271 | ||
9fd6b37a | 1272 | static struct nand_bbt_descr bbt_mirror_no_oob_descr = { |
7cba7b14 SAS |
1273 | .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
1274 | | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP | |
1275 | | NAND_BBT_NO_OOB, | |
1276 | .len = 4, | |
1277 | .veroffs = 4, | |
1278 | .maxblocks = 4, | |
1279 | .pattern = mirror_pattern | |
1280 | }; | |
1281 | ||
752ed6c5 | 1282 | #define BADBLOCK_SCAN_MASK (~NAND_BBT_NO_OOB) |
58373ff0 | 1283 | /** |
752ed6c5 | 1284 | * nand_create_badblock_pattern - [INTERN] Creates a BBT descriptor structure |
8b6e50c9 | 1285 | * @this: NAND chip to create descriptor for |
58373ff0 BN |
1286 | * |
1287 | * This function allocates and initializes a nand_bbt_descr for BBM detection | |
752ed6c5 | 1288 | * based on the properties of @this. The new descriptor is stored in |
58373ff0 BN |
1289 | * this->badblock_pattern. Thus, this->badblock_pattern should be NULL when |
1290 | * passed to this function. | |
58373ff0 | 1291 | */ |
752ed6c5 | 1292 | static int nand_create_badblock_pattern(struct nand_chip *this) |
58373ff0 BN |
1293 | { |
1294 | struct nand_bbt_descr *bd; | |
1295 | if (this->badblock_pattern) { | |
752ed6c5 | 1296 | pr_warn("Bad block pattern already allocated; not replacing\n"); |
58373ff0 BN |
1297 | return -EINVAL; |
1298 | } | |
1299 | bd = kzalloc(sizeof(*bd), GFP_KERNEL); | |
0870066d | 1300 | if (!bd) |
58373ff0 | 1301 | return -ENOMEM; |
752ed6c5 | 1302 | bd->options = this->bbt_options & BADBLOCK_SCAN_MASK; |
58373ff0 BN |
1303 | bd->offs = this->badblockpos; |
1304 | bd->len = (this->options & NAND_BUSWIDTH_16) ? 2 : 1; | |
1305 | bd->pattern = scan_ff_pattern; | |
1306 | bd->options |= NAND_BBT_DYNAMICSTRUCT; | |
1307 | this->badblock_pattern = bd; | |
1308 | return 0; | |
1309 | } | |
1310 | ||
1da177e4 | 1311 | /** |
61b03bd7 | 1312 | * nand_default_bbt - [NAND Interface] Select a default bad block table for the device |
8b6e50c9 | 1313 | * @mtd: MTD device structure |
1da177e4 | 1314 | * |
8b6e50c9 BN |
1315 | * This function selects the default bad block table support for the device and |
1316 | * calls the nand_scan_bbt function. | |
1317 | */ | |
e0c7d767 | 1318 | int nand_default_bbt(struct mtd_info *mtd) |
1da177e4 LT |
1319 | { |
1320 | struct nand_chip *this = mtd->priv; | |
61b03bd7 | 1321 | |
8b6e50c9 BN |
1322 | /* |
1323 | * Default for AG-AND. We must use a flash based bad block table as the | |
1324 | * devices have factory marked _good_ blocks. Erasing those blocks | |
1325 | * leads to loss of the good / bad information, so we _must_ store this | |
1326 | * information in a good / bad table during startup. | |
e0c7d767 | 1327 | */ |
1da177e4 LT |
1328 | if (this->options & NAND_IS_AND) { |
1329 | /* Use the default pattern descriptors */ | |
61b03bd7 | 1330 | if (!this->bbt_td) { |
1da177e4 LT |
1331 | this->bbt_td = &bbt_main_descr; |
1332 | this->bbt_md = &bbt_mirror_descr; | |
61b03bd7 | 1333 | } |
bb9ebd4e | 1334 | this->bbt_options |= NAND_BBT_USE_FLASH; |
e0c7d767 | 1335 | return nand_scan_bbt(mtd, &agand_flashbased); |
1da177e4 | 1336 | } |
61b03bd7 | 1337 | |
8b6e50c9 | 1338 | /* Is a flash based bad block table requested? */ |
bb9ebd4e | 1339 | if (this->bbt_options & NAND_BBT_USE_FLASH) { |
61b03bd7 TG |
1340 | /* Use the default pattern descriptors */ |
1341 | if (!this->bbt_td) { | |
a40f7341 | 1342 | if (this->bbt_options & NAND_BBT_NO_OOB) { |
9fd6b37a BN |
1343 | this->bbt_td = &bbt_main_no_oob_descr; |
1344 | this->bbt_md = &bbt_mirror_no_oob_descr; | |
7cba7b14 SAS |
1345 | } else { |
1346 | this->bbt_td = &bbt_main_descr; | |
1347 | this->bbt_md = &bbt_mirror_descr; | |
1348 | } | |
1da177e4 | 1349 | } |
1da177e4 LT |
1350 | } else { |
1351 | this->bbt_td = NULL; | |
1352 | this->bbt_md = NULL; | |
1da177e4 | 1353 | } |
a2f812df BN |
1354 | |
1355 | if (!this->badblock_pattern) | |
752ed6c5 | 1356 | nand_create_badblock_pattern(this); |
a2f812df | 1357 | |
e0c7d767 | 1358 | return nand_scan_bbt(mtd, this->badblock_pattern); |
1da177e4 LT |
1359 | } |
1360 | ||
1361 | /** | |
61b03bd7 | 1362 | * nand_isbad_bbt - [NAND Interface] Check if a block is bad |
8b6e50c9 BN |
1363 | * @mtd: MTD device structure |
1364 | * @offs: offset in the device | |
1365 | * @allowbbt: allow access to bad block table region | |
1366 | */ | |
e0c7d767 | 1367 | int nand_isbad_bbt(struct mtd_info *mtd, loff_t offs, int allowbbt) |
1da177e4 LT |
1368 | { |
1369 | struct nand_chip *this = mtd->priv; | |
1370 | int block; | |
e0c7d767 | 1371 | uint8_t res; |
61b03bd7 | 1372 | |
1da177e4 | 1373 | /* Get block number * 2 */ |
e0c7d767 | 1374 | block = (int)(offs >> (this->bbt_erase_shift - 1)); |
1da177e4 LT |
1375 | res = (this->bbt[block >> 3] >> (block & 0x06)) & 0x03; |
1376 | ||
289c0522 BN |
1377 | pr_debug("nand_isbad_bbt(): bbt info for offs 0x%08x: " |
1378 | "(block %d) 0x%02x\n", | |
1379 | (unsigned int)offs, block >> 1, res); | |
1da177e4 LT |
1380 | |
1381 | switch ((int)res) { | |
e0c7d767 DW |
1382 | case 0x00: |
1383 | return 0; | |
1384 | case 0x01: | |
1385 | return 1; | |
1386 | case 0x02: | |
1387 | return allowbbt ? 0 : 1; | |
1da177e4 LT |
1388 | } |
1389 | return 1; | |
1390 | } | |
1391 | ||
e0c7d767 DW |
1392 | EXPORT_SYMBOL(nand_scan_bbt); |
1393 | EXPORT_SYMBOL(nand_default_bbt); |