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 SAS |
16 | * depending on the options in the BBT descriptor(s). If no flash based BBT |
17 | * (NAND_USE_FLASH_BBT) is specified then the device is scanned for factory | |
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27 | * If one of the BBTs is out of date or does not exist it is (re)created.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 | |
39 | * option NAND_USE_FLASH_BBT_NO_OOB should be used: it moves the ident pattern | |
40 | * and the version byte into the data area and the OOB area will remain | |
41 | * 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> |
1da177e4 | 70 | |
7cba7b14 SAS |
71 | static int check_pattern_no_oob(uint8_t *buf, struct nand_bbt_descr *td) |
72 | { | |
73 | int ret; | |
74 | ||
75 | ret = memcmp(buf, td->pattern, td->len); | |
76 | if (!ret) | |
77 | return ret; | |
78 | return -1; | |
79 | } | |
80 | ||
61b03bd7 | 81 | /** |
1da177e4 LT |
82 | * check_pattern - [GENERIC] check if a pattern is in the buffer |
83 | * @buf: the buffer to search | |
84 | * @len: the length of buffer to search | |
85 | * @paglen: the pagelength | |
86 | * @td: search pattern descriptor | |
87 | * | |
88 | * Check for a pattern at the given place. Used to search bad block | |
89 | * tables and good / bad block identifiers. | |
90 | * If the SCAN_EMPTY option is set then check, if all bytes except the | |
91 | * pattern area contain 0xff | |
92 | * | |
93 | */ | |
e0c7d767 | 94 | static int check_pattern(uint8_t *buf, int len, int paglen, struct nand_bbt_descr *td) |
1da177e4 | 95 | { |
171650af | 96 | int i, end = 0; |
1da177e4 LT |
97 | uint8_t *p = buf; |
98 | ||
7cba7b14 SAS |
99 | if (td->options & NAND_BBT_NO_OOB) |
100 | return check_pattern_no_oob(buf, td); | |
101 | ||
c9e05365 | 102 | end = paglen + td->offs; |
1da177e4 LT |
103 | if (td->options & NAND_BBT_SCANEMPTY) { |
104 | for (i = 0; i < end; i++) { | |
105 | if (p[i] != 0xff) | |
106 | return -1; | |
107 | } | |
61b03bd7 | 108 | } |
c9e05365 | 109 | p += end; |
61b03bd7 | 110 | |
1da177e4 LT |
111 | /* Compare the pattern */ |
112 | for (i = 0; i < td->len; i++) { | |
113 | if (p[i] != td->pattern[i]) | |
114 | return -1; | |
115 | } | |
116 | ||
58373ff0 BN |
117 | /* Check both positions 1 and 6 for pattern? */ |
118 | if (td->options & NAND_BBT_SCANBYTE1AND6) { | |
119 | if (td->options & NAND_BBT_SCANEMPTY) { | |
120 | p += td->len; | |
121 | end += NAND_SMALL_BADBLOCK_POS - td->offs; | |
122 | /* Check region between positions 1 and 6 */ | |
123 | for (i = 0; i < NAND_SMALL_BADBLOCK_POS - td->offs - td->len; | |
124 | i++) { | |
125 | if (*p++ != 0xff) | |
126 | return -1; | |
127 | } | |
128 | } | |
129 | else { | |
130 | p += NAND_SMALL_BADBLOCK_POS - td->offs; | |
131 | } | |
132 | /* Compare the pattern */ | |
133 | for (i = 0; i < td->len; i++) { | |
134 | if (p[i] != td->pattern[i]) | |
135 | return -1; | |
136 | } | |
137 | } | |
138 | ||
1da177e4 | 139 | if (td->options & NAND_BBT_SCANEMPTY) { |
171650af AB |
140 | p += td->len; |
141 | end += td->len; | |
1da177e4 LT |
142 | for (i = end; i < len; i++) { |
143 | if (*p++ != 0xff) | |
144 | return -1; | |
145 | } | |
146 | } | |
147 | return 0; | |
148 | } | |
149 | ||
61b03bd7 | 150 | /** |
c9e05365 TG |
151 | * check_short_pattern - [GENERIC] check if a pattern is in the buffer |
152 | * @buf: the buffer to search | |
c9e05365 TG |
153 | * @td: search pattern descriptor |
154 | * | |
155 | * Check for a pattern at the given place. Used to search bad block | |
61b03bd7 | 156 | * tables and good / bad block identifiers. Same as check_pattern, but |
19870da7 | 157 | * no optional empty check |
c9e05365 TG |
158 | * |
159 | */ | |
e0c7d767 | 160 | static int check_short_pattern(uint8_t *buf, struct nand_bbt_descr *td) |
c9e05365 TG |
161 | { |
162 | int i; | |
163 | uint8_t *p = buf; | |
164 | ||
165 | /* Compare the pattern */ | |
166 | for (i = 0; i < td->len; i++) { | |
19870da7 | 167 | if (p[td->offs + i] != td->pattern[i]) |
c9e05365 TG |
168 | return -1; |
169 | } | |
58373ff0 BN |
170 | /* Need to check location 1 AND 6? */ |
171 | if (td->options & NAND_BBT_SCANBYTE1AND6) { | |
172 | for (i = 0; i < td->len; i++) { | |
173 | if (p[NAND_SMALL_BADBLOCK_POS + i] != td->pattern[i]) | |
174 | return -1; | |
175 | } | |
176 | } | |
c9e05365 TG |
177 | return 0; |
178 | } | |
179 | ||
7cba7b14 SAS |
180 | /** |
181 | * add_marker_len - compute the length of the marker in data area | |
182 | * @td: BBT descriptor used for computation | |
183 | * | |
184 | * The length will be 0 if the markeris located in OOB area. | |
185 | */ | |
186 | static u32 add_marker_len(struct nand_bbt_descr *td) | |
187 | { | |
188 | u32 len; | |
189 | ||
190 | if (!(td->options & NAND_BBT_NO_OOB)) | |
191 | return 0; | |
192 | ||
193 | len = td->len; | |
194 | if (td->options & NAND_BBT_VERSION) | |
195 | len++; | |
196 | return len; | |
197 | } | |
198 | ||
1da177e4 LT |
199 | /** |
200 | * read_bbt - [GENERIC] Read the bad block table starting from page | |
201 | * @mtd: MTD device structure | |
202 | * @buf: temporary buffer | |
203 | * @page: the starting page | |
204 | * @num: the number of bbt descriptors to read | |
df5b4e34 | 205 | * @td: the bbt describtion table |
1da177e4 | 206 | * @offs: offset in the memory table |
1da177e4 LT |
207 | * |
208 | * Read the bad block table starting from page. | |
209 | * | |
210 | */ | |
e0c7d767 | 211 | static int read_bbt(struct mtd_info *mtd, uint8_t *buf, int page, int num, |
df5b4e34 | 212 | struct nand_bbt_descr *td, int offs) |
1da177e4 LT |
213 | { |
214 | int res, i, j, act = 0; | |
215 | struct nand_chip *this = mtd->priv; | |
216 | size_t retlen, len, totlen; | |
217 | loff_t from; | |
df5b4e34 | 218 | int bits = td->options & NAND_BBT_NRBITS_MSK; |
1da177e4 | 219 | uint8_t msk = (uint8_t) ((1 << bits) - 1); |
7cba7b14 | 220 | u32 marker_len; |
df5b4e34 | 221 | int reserved_block_code = td->reserved_block_code; |
1da177e4 LT |
222 | |
223 | totlen = (num * bits) >> 3; | |
7cba7b14 | 224 | marker_len = add_marker_len(td); |
e0c7d767 | 225 | from = ((loff_t) page) << this->page_shift; |
61b03bd7 | 226 | |
1da177e4 | 227 | while (totlen) { |
e0c7d767 | 228 | len = min(totlen, (size_t) (1 << this->bbt_erase_shift)); |
7cba7b14 SAS |
229 | if (marker_len) { |
230 | /* | |
231 | * In case the BBT marker is not in the OOB area it | |
232 | * will be just in the first page. | |
233 | */ | |
234 | len -= marker_len; | |
235 | from += marker_len; | |
236 | marker_len = 0; | |
237 | } | |
9223a456 | 238 | res = mtd->read(mtd, from, len, &retlen, buf); |
1da177e4 LT |
239 | if (res < 0) { |
240 | if (retlen != len) { | |
e0c7d767 | 241 | printk(KERN_INFO "nand_bbt: Error reading bad block table\n"); |
1da177e4 LT |
242 | return res; |
243 | } | |
e0c7d767 | 244 | printk(KERN_WARNING "nand_bbt: ECC error while reading bad block table\n"); |
61b03bd7 | 245 | } |
1da177e4 LT |
246 | |
247 | /* Analyse data */ | |
248 | for (i = 0; i < len; i++) { | |
249 | uint8_t dat = buf[i]; | |
250 | for (j = 0; j < 8; j += bits, act += 2) { | |
251 | uint8_t tmp = (dat >> j) & msk; | |
252 | if (tmp == msk) | |
253 | continue; | |
e0c7d767 | 254 | if (reserved_block_code && (tmp == reserved_block_code)) { |
69423d99 AH |
255 | printk(KERN_DEBUG "nand_read_bbt: Reserved block at 0x%012llx\n", |
256 | (loff_t)((offs << 2) + (act >> 1)) << this->bbt_erase_shift); | |
1da177e4 | 257 | this->bbt[offs + (act >> 3)] |= 0x2 << (act & 0x06); |
f1a28c02 | 258 | mtd->ecc_stats.bbtblocks++; |
1da177e4 LT |
259 | continue; |
260 | } | |
261 | /* Leave it for now, if its matured we can move this | |
262 | * message to MTD_DEBUG_LEVEL0 */ | |
69423d99 AH |
263 | printk(KERN_DEBUG "nand_read_bbt: Bad block at 0x%012llx\n", |
264 | (loff_t)((offs << 2) + (act >> 1)) << this->bbt_erase_shift); | |
61b03bd7 | 265 | /* Factory marked bad or worn out ? */ |
1da177e4 LT |
266 | if (tmp == 0) |
267 | this->bbt[offs + (act >> 3)] |= 0x3 << (act & 0x06); | |
268 | else | |
269 | this->bbt[offs + (act >> 3)] |= 0x1 << (act & 0x06); | |
f1a28c02 | 270 | mtd->ecc_stats.badblocks++; |
61b03bd7 | 271 | } |
1da177e4 LT |
272 | } |
273 | totlen -= len; | |
274 | from += len; | |
275 | } | |
276 | return 0; | |
277 | } | |
278 | ||
279 | /** | |
280 | * read_abs_bbt - [GENERIC] Read the bad block table starting at a given page | |
281 | * @mtd: MTD device structure | |
282 | * @buf: temporary buffer | |
61b03bd7 | 283 | * @td: descriptor for the bad block table |
1da177e4 LT |
284 | * @chip: read the table for a specific chip, -1 read all chips. |
285 | * Applies only if NAND_BBT_PERCHIP option is set | |
286 | * | |
287 | * Read the bad block table for all chips starting at a given page | |
288 | * We assume that the bbt bits are in consecutive order. | |
289 | */ | |
e0c7d767 | 290 | static int read_abs_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td, int chip) |
1da177e4 LT |
291 | { |
292 | struct nand_chip *this = mtd->priv; | |
293 | int res = 0, i; | |
1da177e4 | 294 | |
1da177e4 LT |
295 | if (td->options & NAND_BBT_PERCHIP) { |
296 | int offs = 0; | |
297 | for (i = 0; i < this->numchips; i++) { | |
298 | if (chip == -1 || chip == i) | |
df5b4e34 SAS |
299 | res = read_bbt(mtd, buf, td->pages[i], |
300 | this->chipsize >> this->bbt_erase_shift, | |
301 | td, offs); | |
1da177e4 LT |
302 | if (res) |
303 | return res; | |
304 | offs += this->chipsize >> (this->bbt_erase_shift + 2); | |
305 | } | |
306 | } else { | |
df5b4e34 SAS |
307 | res = read_bbt(mtd, buf, td->pages[0], |
308 | mtd->size >> this->bbt_erase_shift, td, 0); | |
1da177e4 LT |
309 | if (res) |
310 | return res; | |
311 | } | |
312 | return 0; | |
313 | } | |
314 | ||
7cba7b14 SAS |
315 | /* |
316 | * BBT marker is in the first page, no OOB. | |
317 | */ | |
318 | static int scan_read_raw_data(struct mtd_info *mtd, uint8_t *buf, loff_t offs, | |
319 | struct nand_bbt_descr *td) | |
320 | { | |
321 | size_t retlen; | |
322 | size_t len; | |
323 | ||
324 | len = td->len; | |
325 | if (td->options & NAND_BBT_VERSION) | |
326 | len++; | |
327 | ||
328 | return mtd->read(mtd, offs, len, &retlen, buf); | |
329 | } | |
330 | ||
8593fbc6 TG |
331 | /* |
332 | * Scan read raw data from flash | |
333 | */ | |
7cba7b14 | 334 | static int scan_read_raw_oob(struct mtd_info *mtd, uint8_t *buf, loff_t offs, |
8593fbc6 TG |
335 | size_t len) |
336 | { | |
337 | struct mtd_oob_ops ops; | |
b64d39d8 | 338 | int res; |
8593fbc6 TG |
339 | |
340 | ops.mode = MTD_OOB_RAW; | |
341 | ops.ooboffs = 0; | |
342 | ops.ooblen = mtd->oobsize; | |
8593fbc6 | 343 | |
b64d39d8 ML |
344 | |
345 | while (len > 0) { | |
346 | if (len <= mtd->writesize) { | |
347 | ops.oobbuf = buf + len; | |
348 | ops.datbuf = buf; | |
349 | ops.len = len; | |
350 | return mtd->read_oob(mtd, offs, &ops); | |
351 | } else { | |
352 | ops.oobbuf = buf + mtd->writesize; | |
353 | ops.datbuf = buf; | |
354 | ops.len = mtd->writesize; | |
355 | res = mtd->read_oob(mtd, offs, &ops); | |
356 | ||
357 | if (res) | |
358 | return res; | |
359 | } | |
360 | ||
361 | buf += mtd->oobsize + mtd->writesize; | |
362 | len -= mtd->writesize; | |
363 | } | |
364 | return 0; | |
8593fbc6 TG |
365 | } |
366 | ||
7cba7b14 SAS |
367 | static int scan_read_raw(struct mtd_info *mtd, uint8_t *buf, loff_t offs, |
368 | size_t len, struct nand_bbt_descr *td) | |
369 | { | |
370 | if (td->options & NAND_BBT_NO_OOB) | |
371 | return scan_read_raw_data(mtd, buf, offs, td); | |
372 | else | |
373 | return scan_read_raw_oob(mtd, buf, offs, len); | |
374 | } | |
375 | ||
8593fbc6 TG |
376 | /* |
377 | * Scan write data with oob to flash | |
378 | */ | |
379 | static int scan_write_bbt(struct mtd_info *mtd, loff_t offs, size_t len, | |
380 | uint8_t *buf, uint8_t *oob) | |
381 | { | |
382 | struct mtd_oob_ops ops; | |
383 | ||
384 | ops.mode = MTD_OOB_PLACE; | |
385 | ops.ooboffs = 0; | |
386 | ops.ooblen = mtd->oobsize; | |
387 | ops.datbuf = buf; | |
388 | ops.oobbuf = oob; | |
389 | ops.len = len; | |
390 | ||
391 | return mtd->write_oob(mtd, offs, &ops); | |
392 | } | |
393 | ||
7cba7b14 SAS |
394 | static u32 bbt_get_ver_offs(struct mtd_info *mtd, struct nand_bbt_descr *td) |
395 | { | |
396 | u32 ver_offs = td->veroffs; | |
397 | ||
398 | if (!(td->options & NAND_BBT_NO_OOB)) | |
399 | ver_offs += mtd->writesize; | |
400 | return ver_offs; | |
401 | } | |
402 | ||
1da177e4 LT |
403 | /** |
404 | * read_abs_bbts - [GENERIC] Read the bad block table(s) for all chips starting at a given page | |
405 | * @mtd: MTD device structure | |
406 | * @buf: temporary buffer | |
61b03bd7 | 407 | * @td: descriptor for the bad block table |
1da177e4 LT |
408 | * @md: descriptor for the bad block table mirror |
409 | * | |
410 | * Read the bad block table(s) for all chips starting at a given page | |
411 | * We assume that the bbt bits are in consecutive order. | |
412 | * | |
413 | */ | |
8593fbc6 TG |
414 | static int read_abs_bbts(struct mtd_info *mtd, uint8_t *buf, |
415 | struct nand_bbt_descr *td, struct nand_bbt_descr *md) | |
1da177e4 LT |
416 | { |
417 | struct nand_chip *this = mtd->priv; | |
418 | ||
61b03bd7 | 419 | /* Read the primary version, if available */ |
1da177e4 | 420 | if (td->options & NAND_BBT_VERSION) { |
69423d99 | 421 | scan_read_raw(mtd, buf, (loff_t)td->pages[0] << this->page_shift, |
7cba7b14 SAS |
422 | mtd->writesize, td); |
423 | td->version[0] = buf[bbt_get_ver_offs(mtd, td)]; | |
8593fbc6 TG |
424 | printk(KERN_DEBUG "Bad block table at page %d, version 0x%02X\n", |
425 | td->pages[0], td->version[0]); | |
1da177e4 LT |
426 | } |
427 | ||
61b03bd7 | 428 | /* Read the mirror version, if available */ |
1da177e4 | 429 | if (md && (md->options & NAND_BBT_VERSION)) { |
69423d99 | 430 | scan_read_raw(mtd, buf, (loff_t)md->pages[0] << this->page_shift, |
7cba7b14 SAS |
431 | mtd->writesize, td); |
432 | md->version[0] = buf[bbt_get_ver_offs(mtd, md)]; | |
8593fbc6 TG |
433 | printk(KERN_DEBUG "Bad block table at page %d, version 0x%02X\n", |
434 | md->pages[0], md->version[0]); | |
1da177e4 | 435 | } |
1da177e4 LT |
436 | return 1; |
437 | } | |
438 | ||
8593fbc6 TG |
439 | /* |
440 | * Scan a given block full | |
441 | */ | |
442 | static int scan_block_full(struct mtd_info *mtd, struct nand_bbt_descr *bd, | |
443 | loff_t offs, uint8_t *buf, size_t readlen, | |
444 | int scanlen, int len) | |
445 | { | |
446 | int ret, j; | |
447 | ||
7cba7b14 | 448 | ret = scan_read_raw_oob(mtd, buf, offs, readlen); |
8593fbc6 TG |
449 | if (ret) |
450 | return ret; | |
451 | ||
452 | for (j = 0; j < len; j++, buf += scanlen) { | |
453 | if (check_pattern(buf, scanlen, mtd->writesize, bd)) | |
454 | return 1; | |
455 | } | |
456 | return 0; | |
457 | } | |
458 | ||
459 | /* | |
460 | * Scan a given block partially | |
461 | */ | |
462 | static int scan_block_fast(struct mtd_info *mtd, struct nand_bbt_descr *bd, | |
463 | loff_t offs, uint8_t *buf, int len) | |
464 | { | |
465 | struct mtd_oob_ops ops; | |
466 | int j, ret; | |
467 | ||
8593fbc6 TG |
468 | ops.ooblen = mtd->oobsize; |
469 | ops.oobbuf = buf; | |
470 | ops.ooboffs = 0; | |
471 | ops.datbuf = NULL; | |
472 | ops.mode = MTD_OOB_PLACE; | |
473 | ||
474 | for (j = 0; j < len; j++) { | |
475 | /* | |
476 | * Read the full oob until read_oob is fixed to | |
477 | * handle single byte reads for 16 bit | |
478 | * buswidth | |
479 | */ | |
480 | ret = mtd->read_oob(mtd, offs, &ops); | |
481 | if (ret) | |
482 | return ret; | |
483 | ||
484 | if (check_short_pattern(buf, bd)) | |
485 | return 1; | |
486 | ||
487 | offs += mtd->writesize; | |
488 | } | |
489 | return 0; | |
490 | } | |
491 | ||
1da177e4 LT |
492 | /** |
493 | * create_bbt - [GENERIC] Create a bad block table by scanning the device | |
494 | * @mtd: MTD device structure | |
495 | * @buf: temporary buffer | |
496 | * @bd: descriptor for the good/bad block search pattern | |
497 | * @chip: create the table for a specific chip, -1 read all chips. | |
498 | * Applies only if NAND_BBT_PERCHIP option is set | |
499 | * | |
500 | * Create a bad block table by scanning the device | |
501 | * for the given good/bad block identify pattern | |
502 | */ | |
8593fbc6 TG |
503 | static int create_bbt(struct mtd_info *mtd, uint8_t *buf, |
504 | struct nand_bbt_descr *bd, int chip) | |
1da177e4 LT |
505 | { |
506 | struct nand_chip *this = mtd->priv; | |
8593fbc6 | 507 | int i, numblocks, len, scanlen; |
1da177e4 LT |
508 | int startblock; |
509 | loff_t from; | |
8593fbc6 | 510 | size_t readlen; |
1da177e4 | 511 | |
e0c7d767 | 512 | printk(KERN_INFO "Scanning device for bad blocks\n"); |
1da177e4 LT |
513 | |
514 | if (bd->options & NAND_BBT_SCANALLPAGES) | |
515 | len = 1 << (this->bbt_erase_shift - this->page_shift); | |
58373ff0 BN |
516 | else if (bd->options & NAND_BBT_SCAN2NDPAGE) |
517 | len = 2; | |
518 | else | |
519 | len = 1; | |
171650af AB |
520 | |
521 | if (!(bd->options & NAND_BBT_SCANEMPTY)) { | |
522 | /* We need only read few bytes from the OOB area */ | |
8593fbc6 | 523 | scanlen = 0; |
eeada24d AB |
524 | readlen = bd->len; |
525 | } else { | |
171650af | 526 | /* Full page content should be read */ |
28318776 JE |
527 | scanlen = mtd->writesize + mtd->oobsize; |
528 | readlen = len * mtd->writesize; | |
eeada24d | 529 | } |
1da177e4 LT |
530 | |
531 | if (chip == -1) { | |
8593fbc6 TG |
532 | /* Note that numblocks is 2 * (real numblocks) here, see i+=2 |
533 | * below as it makes shifting and masking less painful */ | |
1da177e4 LT |
534 | numblocks = mtd->size >> (this->bbt_erase_shift - 1); |
535 | startblock = 0; | |
536 | from = 0; | |
537 | } else { | |
538 | if (chip >= this->numchips) { | |
e0c7d767 DW |
539 | printk(KERN_WARNING "create_bbt(): chipnr (%d) > available chips (%d)\n", |
540 | chip + 1, this->numchips); | |
171650af | 541 | return -EINVAL; |
1da177e4 LT |
542 | } |
543 | numblocks = this->chipsize >> (this->bbt_erase_shift - 1); | |
544 | startblock = chip * numblocks; | |
545 | numblocks += startblock; | |
69423d99 | 546 | from = (loff_t)startblock << (this->bbt_erase_shift - 1); |
1da177e4 | 547 | } |
61b03bd7 | 548 | |
30fe8115 | 549 | if (this->options & NAND_BBT_SCANLASTPAGE) |
b60b08b0 KC |
550 | from += mtd->erasesize - (mtd->writesize * len); |
551 | ||
1da177e4 | 552 | for (i = startblock; i < numblocks;) { |
eeada24d | 553 | int ret; |
61b03bd7 | 554 | |
7cba7b14 SAS |
555 | BUG_ON(bd->options & NAND_BBT_NO_OOB); |
556 | ||
8593fbc6 TG |
557 | if (bd->options & NAND_BBT_SCANALLPAGES) |
558 | ret = scan_block_full(mtd, bd, from, buf, readlen, | |
559 | scanlen, len); | |
560 | else | |
561 | ret = scan_block_fast(mtd, bd, from, buf, len); | |
562 | ||
563 | if (ret < 0) | |
564 | return ret; | |
565 | ||
566 | if (ret) { | |
567 | this->bbt[i >> 3] |= 0x03 << (i & 0x6); | |
69423d99 AH |
568 | printk(KERN_WARNING "Bad eraseblock %d at 0x%012llx\n", |
569 | i >> 1, (unsigned long long)from); | |
f1a28c02 | 570 | mtd->ecc_stats.badblocks++; |
1da177e4 | 571 | } |
8593fbc6 | 572 | |
1da177e4 LT |
573 | i += 2; |
574 | from += (1 << this->bbt_erase_shift); | |
575 | } | |
eeada24d | 576 | return 0; |
1da177e4 LT |
577 | } |
578 | ||
579 | /** | |
580 | * search_bbt - [GENERIC] scan the device for a specific bad block table | |
581 | * @mtd: MTD device structure | |
582 | * @buf: temporary buffer | |
583 | * @td: descriptor for the bad block table | |
584 | * | |
585 | * Read the bad block table by searching for a given ident pattern. | |
61b03bd7 | 586 | * Search is preformed either from the beginning up or from the end of |
1da177e4 LT |
587 | * the device downwards. The search starts always at the start of a |
588 | * block. | |
61b03bd7 | 589 | * If the option NAND_BBT_PERCHIP is given, each chip is searched |
1da177e4 | 590 | * for a bbt, which contains the bad block information of this chip. |
e0c7d767 | 591 | * This is necessary to provide support for certain DOC devices. |
1da177e4 | 592 | * |
61b03bd7 TG |
593 | * The bbt ident pattern resides in the oob area of the first page |
594 | * in a block. | |
1da177e4 | 595 | */ |
e0c7d767 | 596 | static int search_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td) |
1da177e4 LT |
597 | { |
598 | struct nand_chip *this = mtd->priv; | |
599 | int i, chips; | |
600 | int bits, startblock, block, dir; | |
28318776 | 601 | int scanlen = mtd->writesize + mtd->oobsize; |
1da177e4 | 602 | int bbtblocks; |
8593fbc6 | 603 | int blocktopage = this->bbt_erase_shift - this->page_shift; |
1da177e4 LT |
604 | |
605 | /* Search direction top -> down ? */ | |
606 | if (td->options & NAND_BBT_LASTBLOCK) { | |
e0c7d767 | 607 | startblock = (mtd->size >> this->bbt_erase_shift) - 1; |
1da177e4 LT |
608 | dir = -1; |
609 | } else { | |
61b03bd7 | 610 | startblock = 0; |
1da177e4 | 611 | dir = 1; |
61b03bd7 TG |
612 | } |
613 | ||
1da177e4 LT |
614 | /* Do we have a bbt per chip ? */ |
615 | if (td->options & NAND_BBT_PERCHIP) { | |
616 | chips = this->numchips; | |
617 | bbtblocks = this->chipsize >> this->bbt_erase_shift; | |
618 | startblock &= bbtblocks - 1; | |
619 | } else { | |
620 | chips = 1; | |
621 | bbtblocks = mtd->size >> this->bbt_erase_shift; | |
622 | } | |
61b03bd7 | 623 | |
1da177e4 LT |
624 | /* Number of bits for each erase block in the bbt */ |
625 | bits = td->options & NAND_BBT_NRBITS_MSK; | |
61b03bd7 | 626 | |
1da177e4 LT |
627 | for (i = 0; i < chips; i++) { |
628 | /* Reset version information */ | |
61b03bd7 | 629 | td->version[i] = 0; |
1da177e4 LT |
630 | td->pages[i] = -1; |
631 | /* Scan the maximum number of blocks */ | |
632 | for (block = 0; block < td->maxblocks; block++) { | |
8593fbc6 | 633 | |
1da177e4 | 634 | int actblock = startblock + dir * block; |
69423d99 | 635 | loff_t offs = (loff_t)actblock << this->bbt_erase_shift; |
8593fbc6 | 636 | |
1da177e4 | 637 | /* Read first page */ |
7cba7b14 | 638 | scan_read_raw(mtd, buf, offs, mtd->writesize, td); |
28318776 | 639 | if (!check_pattern(buf, scanlen, mtd->writesize, td)) { |
8593fbc6 | 640 | td->pages[i] = actblock << blocktopage; |
1da177e4 | 641 | if (td->options & NAND_BBT_VERSION) { |
7cba7b14 SAS |
642 | offs = bbt_get_ver_offs(mtd, td); |
643 | td->version[i] = buf[offs]; | |
1da177e4 LT |
644 | } |
645 | break; | |
646 | } | |
647 | } | |
648 | startblock += this->chipsize >> this->bbt_erase_shift; | |
649 | } | |
650 | /* Check, if we found a bbt for each requested chip */ | |
651 | for (i = 0; i < chips; i++) { | |
652 | if (td->pages[i] == -1) | |
e0c7d767 | 653 | printk(KERN_WARNING "Bad block table not found for chip %d\n", i); |
1da177e4 | 654 | else |
e0c7d767 DW |
655 | printk(KERN_DEBUG "Bad block table found at page %d, version 0x%02X\n", td->pages[i], |
656 | td->version[i]); | |
1da177e4 | 657 | } |
61b03bd7 | 658 | return 0; |
1da177e4 LT |
659 | } |
660 | ||
661 | /** | |
662 | * search_read_bbts - [GENERIC] scan the device for bad block table(s) | |
663 | * @mtd: MTD device structure | |
664 | * @buf: temporary buffer | |
61b03bd7 | 665 | * @td: descriptor for the bad block table |
1da177e4 LT |
666 | * @md: descriptor for the bad block table mirror |
667 | * | |
668 | * Search and read the bad block table(s) | |
669 | */ | |
e0c7d767 | 670 | static int search_read_bbts(struct mtd_info *mtd, uint8_t * buf, struct nand_bbt_descr *td, struct nand_bbt_descr *md) |
1da177e4 LT |
671 | { |
672 | /* Search the primary table */ | |
e0c7d767 | 673 | search_bbt(mtd, buf, td); |
61b03bd7 | 674 | |
1da177e4 LT |
675 | /* Search the mirror table */ |
676 | if (md) | |
e0c7d767 | 677 | search_bbt(mtd, buf, md); |
61b03bd7 | 678 | |
1da177e4 | 679 | /* Force result check */ |
61b03bd7 | 680 | return 1; |
1da177e4 | 681 | } |
1da177e4 | 682 | |
61b03bd7 | 683 | /** |
1da177e4 LT |
684 | * write_bbt - [GENERIC] (Re)write the bad block table |
685 | * | |
686 | * @mtd: MTD device structure | |
687 | * @buf: temporary buffer | |
61b03bd7 | 688 | * @td: descriptor for the bad block table |
1da177e4 LT |
689 | * @md: descriptor for the bad block table mirror |
690 | * @chipsel: selector for a specific chip, -1 for all | |
691 | * | |
692 | * (Re)write the bad block table | |
693 | * | |
694 | */ | |
e0c7d767 | 695 | static int write_bbt(struct mtd_info *mtd, uint8_t *buf, |
9223a456 TG |
696 | struct nand_bbt_descr *td, struct nand_bbt_descr *md, |
697 | int chipsel) | |
1da177e4 LT |
698 | { |
699 | struct nand_chip *this = mtd->priv; | |
1da177e4 LT |
700 | struct erase_info einfo; |
701 | int i, j, res, chip = 0; | |
702 | int bits, startblock, dir, page, offs, numblocks, sft, sftmsk; | |
9223a456 | 703 | int nrchips, bbtoffs, pageoffs, ooboffs; |
1da177e4 LT |
704 | uint8_t msk[4]; |
705 | uint8_t rcode = td->reserved_block_code; | |
8593fbc6 | 706 | size_t retlen, len = 0; |
1da177e4 | 707 | loff_t to; |
8593fbc6 TG |
708 | struct mtd_oob_ops ops; |
709 | ||
710 | ops.ooblen = mtd->oobsize; | |
711 | ops.ooboffs = 0; | |
712 | ops.datbuf = NULL; | |
713 | ops.mode = MTD_OOB_PLACE; | |
1da177e4 LT |
714 | |
715 | if (!rcode) | |
716 | rcode = 0xff; | |
717 | /* Write bad block table per chip rather than per device ? */ | |
718 | if (td->options & NAND_BBT_PERCHIP) { | |
e0c7d767 | 719 | numblocks = (int)(this->chipsize >> this->bbt_erase_shift); |
61b03bd7 | 720 | /* Full device write or specific chip ? */ |
1da177e4 LT |
721 | if (chipsel == -1) { |
722 | nrchips = this->numchips; | |
723 | } else { | |
724 | nrchips = chipsel + 1; | |
725 | chip = chipsel; | |
726 | } | |
727 | } else { | |
e0c7d767 | 728 | numblocks = (int)(mtd->size >> this->bbt_erase_shift); |
1da177e4 | 729 | nrchips = 1; |
61b03bd7 TG |
730 | } |
731 | ||
1da177e4 LT |
732 | /* Loop through the chips */ |
733 | for (; chip < nrchips; chip++) { | |
61b03bd7 TG |
734 | |
735 | /* There was already a version of the table, reuse the page | |
736 | * This applies for absolute placement too, as we have the | |
1da177e4 LT |
737 | * page nr. in td->pages. |
738 | */ | |
739 | if (td->pages[chip] != -1) { | |
740 | page = td->pages[chip]; | |
741 | goto write; | |
61b03bd7 | 742 | } |
1da177e4 LT |
743 | |
744 | /* Automatic placement of the bad block table */ | |
745 | /* Search direction top -> down ? */ | |
746 | if (td->options & NAND_BBT_LASTBLOCK) { | |
747 | startblock = numblocks * (chip + 1) - 1; | |
748 | dir = -1; | |
749 | } else { | |
750 | startblock = chip * numblocks; | |
751 | dir = 1; | |
61b03bd7 | 752 | } |
1da177e4 LT |
753 | |
754 | for (i = 0; i < td->maxblocks; i++) { | |
755 | int block = startblock + dir * i; | |
756 | /* Check, if the block is bad */ | |
9223a456 TG |
757 | switch ((this->bbt[block >> 2] >> |
758 | (2 * (block & 0x03))) & 0x03) { | |
1da177e4 LT |
759 | case 0x01: |
760 | case 0x03: | |
761 | continue; | |
762 | } | |
9223a456 TG |
763 | page = block << |
764 | (this->bbt_erase_shift - this->page_shift); | |
1da177e4 LT |
765 | /* Check, if the block is used by the mirror table */ |
766 | if (!md || md->pages[chip] != page) | |
767 | goto write; | |
768 | } | |
e0c7d767 | 769 | printk(KERN_ERR "No space left to write bad block table\n"); |
1da177e4 | 770 | return -ENOSPC; |
e0c7d767 | 771 | write: |
1da177e4 LT |
772 | |
773 | /* Set up shift count and masks for the flash table */ | |
774 | bits = td->options & NAND_BBT_NRBITS_MSK; | |
9223a456 | 775 | msk[2] = ~rcode; |
1da177e4 | 776 | switch (bits) { |
9223a456 TG |
777 | case 1: sft = 3; sftmsk = 0x07; msk[0] = 0x00; msk[1] = 0x01; |
778 | msk[3] = 0x01; | |
779 | break; | |
780 | case 2: sft = 2; sftmsk = 0x06; msk[0] = 0x00; msk[1] = 0x01; | |
781 | msk[3] = 0x03; | |
782 | break; | |
783 | case 4: sft = 1; sftmsk = 0x04; msk[0] = 0x00; msk[1] = 0x0C; | |
784 | msk[3] = 0x0f; | |
785 | break; | |
786 | case 8: sft = 0; sftmsk = 0x00; msk[0] = 0x00; msk[1] = 0x0F; | |
787 | msk[3] = 0xff; | |
788 | break; | |
1da177e4 LT |
789 | default: return -EINVAL; |
790 | } | |
61b03bd7 | 791 | |
1da177e4 | 792 | bbtoffs = chip * (numblocks >> 2); |
61b03bd7 | 793 | |
1da177e4 LT |
794 | to = ((loff_t) page) << this->page_shift; |
795 | ||
1da177e4 LT |
796 | /* Must we save the block contents ? */ |
797 | if (td->options & NAND_BBT_SAVECONTENT) { | |
798 | /* Make it block aligned */ | |
799 | to &= ~((loff_t) ((1 << this->bbt_erase_shift) - 1)); | |
800 | len = 1 << this->bbt_erase_shift; | |
9223a456 | 801 | res = mtd->read(mtd, to, len, &retlen, buf); |
1da177e4 LT |
802 | if (res < 0) { |
803 | if (retlen != len) { | |
9223a456 TG |
804 | printk(KERN_INFO "nand_bbt: Error " |
805 | "reading block for writing " | |
806 | "the bad block table\n"); | |
1da177e4 LT |
807 | return res; |
808 | } | |
9223a456 TG |
809 | printk(KERN_WARNING "nand_bbt: ECC error " |
810 | "while reading block for writing " | |
811 | "bad block table\n"); | |
1da177e4 | 812 | } |
9223a456 | 813 | /* Read oob data */ |
7014568b | 814 | ops.ooblen = (len >> this->page_shift) * mtd->oobsize; |
8593fbc6 TG |
815 | ops.oobbuf = &buf[len]; |
816 | res = mtd->read_oob(mtd, to + mtd->writesize, &ops); | |
7014568b | 817 | if (res < 0 || ops.oobretlen != ops.ooblen) |
9223a456 TG |
818 | goto outerr; |
819 | ||
1da177e4 LT |
820 | /* Calc the byte offset in the buffer */ |
821 | pageoffs = page - (int)(to >> this->page_shift); | |
822 | offs = pageoffs << this->page_shift; | |
823 | /* Preset the bbt area with 0xff */ | |
e0c7d767 | 824 | memset(&buf[offs], 0xff, (size_t) (numblocks >> sft)); |
9223a456 TG |
825 | ooboffs = len + (pageoffs * mtd->oobsize); |
826 | ||
7cba7b14 SAS |
827 | } else if (td->options & NAND_BBT_NO_OOB) { |
828 | ooboffs = 0; | |
829 | offs = td->len; | |
830 | /* the version byte */ | |
831 | if (td->options & NAND_BBT_VERSION) | |
832 | offs++; | |
833 | /* Calc length */ | |
834 | len = (size_t) (numblocks >> sft); | |
835 | len += offs; | |
836 | /* Make it page aligned ! */ | |
837 | len = ALIGN(len, mtd->writesize); | |
838 | /* Preset the buffer with 0xff */ | |
839 | memset(buf, 0xff, len); | |
840 | /* Pattern is located at the begin of first page */ | |
841 | memcpy(buf, td->pattern, td->len); | |
1da177e4 LT |
842 | } else { |
843 | /* Calc length */ | |
844 | len = (size_t) (numblocks >> sft); | |
845 | /* Make it page aligned ! */ | |
cda32091 | 846 | len = ALIGN(len, mtd->writesize); |
1da177e4 | 847 | /* Preset the buffer with 0xff */ |
9223a456 TG |
848 | memset(buf, 0xff, len + |
849 | (len >> this->page_shift)* mtd->oobsize); | |
1da177e4 | 850 | offs = 0; |
9223a456 | 851 | ooboffs = len; |
1da177e4 | 852 | /* Pattern is located in oob area of first page */ |
9223a456 | 853 | memcpy(&buf[ooboffs + td->offs], td->pattern, td->len); |
1da177e4 | 854 | } |
61b03bd7 | 855 | |
9223a456 TG |
856 | if (td->options & NAND_BBT_VERSION) |
857 | buf[ooboffs + td->veroffs] = td->version[chip]; | |
858 | ||
1da177e4 | 859 | /* walk through the memory table */ |
e0c7d767 | 860 | for (i = 0; i < numblocks;) { |
1da177e4 LT |
861 | uint8_t dat; |
862 | dat = this->bbt[bbtoffs + (i >> 2)]; | |
e0c7d767 | 863 | for (j = 0; j < 4; j++, i++) { |
1da177e4 LT |
864 | int sftcnt = (i << (3 - sft)) & sftmsk; |
865 | /* Do not store the reserved bbt blocks ! */ | |
9223a456 TG |
866 | buf[offs + (i >> sft)] &= |
867 | ~(msk[dat & 0x03] << sftcnt); | |
1da177e4 LT |
868 | dat >>= 2; |
869 | } | |
870 | } | |
61b03bd7 | 871 | |
e0c7d767 | 872 | memset(&einfo, 0, sizeof(einfo)); |
1da177e4 | 873 | einfo.mtd = mtd; |
69423d99 | 874 | einfo.addr = to; |
1da177e4 | 875 | einfo.len = 1 << this->bbt_erase_shift; |
e0c7d767 | 876 | res = nand_erase_nand(mtd, &einfo, 1); |
9223a456 TG |
877 | if (res < 0) |
878 | goto outerr; | |
61b03bd7 | 879 | |
7cba7b14 SAS |
880 | res = scan_write_bbt(mtd, to, len, buf, |
881 | td->options & NAND_BBT_NO_OOB ? NULL : | |
882 | &buf[len]); | |
9223a456 TG |
883 | if (res < 0) |
884 | goto outerr; | |
885 | ||
69423d99 AH |
886 | printk(KERN_DEBUG "Bad block table written to 0x%012llx, version " |
887 | "0x%02X\n", (unsigned long long)to, td->version[chip]); | |
61b03bd7 | 888 | |
1da177e4 LT |
889 | /* Mark it as used */ |
890 | td->pages[chip] = page; | |
61b03bd7 | 891 | } |
1da177e4 | 892 | return 0; |
9223a456 TG |
893 | |
894 | outerr: | |
895 | printk(KERN_WARNING | |
896 | "nand_bbt: Error while writing bad block table %d\n", res); | |
897 | return res; | |
1da177e4 LT |
898 | } |
899 | ||
900 | /** | |
901 | * nand_memory_bbt - [GENERIC] create a memory based bad block table | |
902 | * @mtd: MTD device structure | |
903 | * @bd: descriptor for the good/bad block search pattern | |
904 | * | |
61b03bd7 | 905 | * The function creates a memory based bbt by scanning the device |
1da177e4 LT |
906 | * for manufacturer / software marked good / bad blocks |
907 | */ | |
e0c7d767 | 908 | static inline int nand_memory_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd) |
1da177e4 LT |
909 | { |
910 | struct nand_chip *this = mtd->priv; | |
911 | ||
171650af | 912 | bd->options &= ~NAND_BBT_SCANEMPTY; |
4bf63fcb | 913 | return create_bbt(mtd, this->buffers->databuf, bd, -1); |
1da177e4 LT |
914 | } |
915 | ||
916 | /** | |
e0c7d767 | 917 | * check_create - [GENERIC] create and write bbt(s) if necessary |
1da177e4 LT |
918 | * @mtd: MTD device structure |
919 | * @buf: temporary buffer | |
920 | * @bd: descriptor for the good/bad block search pattern | |
921 | * | |
922 | * The function checks the results of the previous call to read_bbt | |
e0c7d767 DW |
923 | * and creates / updates the bbt(s) if necessary |
924 | * Creation is necessary if no bbt was found for the chip/device | |
925 | * Update is necessary if one of the tables is missing or the | |
1da177e4 LT |
926 | * version nr. of one table is less than the other |
927 | */ | |
e0c7d767 | 928 | static int check_create(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *bd) |
1da177e4 LT |
929 | { |
930 | int i, chips, writeops, chipsel, res; | |
931 | struct nand_chip *this = mtd->priv; | |
932 | struct nand_bbt_descr *td = this->bbt_td; | |
933 | struct nand_bbt_descr *md = this->bbt_md; | |
934 | struct nand_bbt_descr *rd, *rd2; | |
935 | ||
936 | /* Do we have a bbt per chip ? */ | |
61b03bd7 | 937 | if (td->options & NAND_BBT_PERCHIP) |
1da177e4 | 938 | chips = this->numchips; |
61b03bd7 | 939 | else |
1da177e4 | 940 | chips = 1; |
61b03bd7 | 941 | |
1da177e4 LT |
942 | for (i = 0; i < chips; i++) { |
943 | writeops = 0; | |
944 | rd = NULL; | |
945 | rd2 = NULL; | |
946 | /* Per chip or per device ? */ | |
947 | chipsel = (td->options & NAND_BBT_PERCHIP) ? i : -1; | |
948 | /* Mirrored table avilable ? */ | |
949 | if (md) { | |
950 | if (td->pages[i] == -1 && md->pages[i] == -1) { | |
951 | writeops = 0x03; | |
952 | goto create; | |
953 | } | |
954 | ||
955 | if (td->pages[i] == -1) { | |
61b03bd7 | 956 | rd = md; |
1da177e4 LT |
957 | td->version[i] = md->version[i]; |
958 | writeops = 1; | |
959 | goto writecheck; | |
960 | } | |
961 | ||
962 | if (md->pages[i] == -1) { | |
963 | rd = td; | |
964 | md->version[i] = td->version[i]; | |
965 | writeops = 2; | |
966 | goto writecheck; | |
967 | } | |
968 | ||
969 | if (td->version[i] == md->version[i]) { | |
970 | rd = td; | |
971 | if (!(td->options & NAND_BBT_VERSION)) | |
972 | rd2 = md; | |
973 | goto writecheck; | |
61b03bd7 | 974 | } |
1da177e4 LT |
975 | |
976 | if (((int8_t) (td->version[i] - md->version[i])) > 0) { | |
977 | rd = td; | |
978 | md->version[i] = td->version[i]; | |
979 | writeops = 2; | |
980 | } else { | |
981 | rd = md; | |
982 | td->version[i] = md->version[i]; | |
983 | writeops = 1; | |
984 | } | |
985 | ||
986 | goto writecheck; | |
987 | ||
988 | } else { | |
989 | if (td->pages[i] == -1) { | |
990 | writeops = 0x01; | |
991 | goto create; | |
992 | } | |
993 | rd = td; | |
994 | goto writecheck; | |
995 | } | |
e0c7d767 | 996 | create: |
1da177e4 LT |
997 | /* Create the bad block table by scanning the device ? */ |
998 | if (!(td->options & NAND_BBT_CREATE)) | |
61b03bd7 TG |
999 | continue; |
1000 | ||
1da177e4 | 1001 | /* Create the table in memory by scanning the chip(s) */ |
453281a9 SAS |
1002 | if (!(this->options & NAND_CREATE_EMPTY_BBT)) |
1003 | create_bbt(mtd, buf, bd, chipsel); | |
61b03bd7 | 1004 | |
1da177e4 LT |
1005 | td->version[i] = 1; |
1006 | if (md) | |
61b03bd7 | 1007 | md->version[i] = 1; |
e0c7d767 | 1008 | writecheck: |
1da177e4 LT |
1009 | /* read back first ? */ |
1010 | if (rd) | |
e0c7d767 | 1011 | read_abs_bbt(mtd, buf, rd, chipsel); |
1da177e4 LT |
1012 | /* If they weren't versioned, read both. */ |
1013 | if (rd2) | |
e0c7d767 | 1014 | read_abs_bbt(mtd, buf, rd2, chipsel); |
1da177e4 LT |
1015 | |
1016 | /* Write the bad block table to the device ? */ | |
1017 | if ((writeops & 0x01) && (td->options & NAND_BBT_WRITE)) { | |
e0c7d767 | 1018 | res = write_bbt(mtd, buf, td, md, chipsel); |
1da177e4 LT |
1019 | if (res < 0) |
1020 | return res; | |
1021 | } | |
61b03bd7 | 1022 | |
1da177e4 LT |
1023 | /* Write the mirror bad block table to the device ? */ |
1024 | if ((writeops & 0x02) && md && (md->options & NAND_BBT_WRITE)) { | |
e0c7d767 | 1025 | res = write_bbt(mtd, buf, md, td, chipsel); |
1da177e4 LT |
1026 | if (res < 0) |
1027 | return res; | |
1028 | } | |
1029 | } | |
61b03bd7 | 1030 | return 0; |
1da177e4 LT |
1031 | } |
1032 | ||
1033 | /** | |
61b03bd7 | 1034 | * mark_bbt_regions - [GENERIC] mark the bad block table regions |
1da177e4 LT |
1035 | * @mtd: MTD device structure |
1036 | * @td: bad block table descriptor | |
1037 | * | |
1038 | * The bad block table regions are marked as "bad" to prevent | |
1039 | * accidental erasures / writes. The regions are identified by | |
1040 | * the mark 0x02. | |
1041 | */ | |
e0c7d767 | 1042 | static void mark_bbt_region(struct mtd_info *mtd, struct nand_bbt_descr *td) |
1da177e4 LT |
1043 | { |
1044 | struct nand_chip *this = mtd->priv; | |
1045 | int i, j, chips, block, nrblocks, update; | |
1046 | uint8_t oldval, newval; | |
1047 | ||
1048 | /* Do we have a bbt per chip ? */ | |
1049 | if (td->options & NAND_BBT_PERCHIP) { | |
1050 | chips = this->numchips; | |
1051 | nrblocks = (int)(this->chipsize >> this->bbt_erase_shift); | |
1052 | } else { | |
1053 | chips = 1; | |
1054 | nrblocks = (int)(mtd->size >> this->bbt_erase_shift); | |
61b03bd7 TG |
1055 | } |
1056 | ||
1da177e4 LT |
1057 | for (i = 0; i < chips; i++) { |
1058 | if ((td->options & NAND_BBT_ABSPAGE) || | |
1059 | !(td->options & NAND_BBT_WRITE)) { | |
e0c7d767 DW |
1060 | if (td->pages[i] == -1) |
1061 | continue; | |
1da177e4 | 1062 | block = td->pages[i] >> (this->bbt_erase_shift - this->page_shift); |
61b03bd7 | 1063 | block <<= 1; |
1da177e4 LT |
1064 | oldval = this->bbt[(block >> 3)]; |
1065 | newval = oldval | (0x2 << (block & 0x06)); | |
1066 | this->bbt[(block >> 3)] = newval; | |
1067 | if ((oldval != newval) && td->reserved_block_code) | |
69423d99 | 1068 | nand_update_bbt(mtd, (loff_t)block << (this->bbt_erase_shift - 1)); |
1da177e4 LT |
1069 | continue; |
1070 | } | |
1071 | update = 0; | |
1072 | if (td->options & NAND_BBT_LASTBLOCK) | |
1073 | block = ((i + 1) * nrblocks) - td->maxblocks; | |
61b03bd7 | 1074 | else |
1da177e4 | 1075 | block = i * nrblocks; |
61b03bd7 | 1076 | block <<= 1; |
1da177e4 LT |
1077 | for (j = 0; j < td->maxblocks; j++) { |
1078 | oldval = this->bbt[(block >> 3)]; | |
1079 | newval = oldval | (0x2 << (block & 0x06)); | |
1080 | this->bbt[(block >> 3)] = newval; | |
e0c7d767 DW |
1081 | if (oldval != newval) |
1082 | update = 1; | |
1da177e4 | 1083 | block += 2; |
61b03bd7 | 1084 | } |
1da177e4 LT |
1085 | /* If we want reserved blocks to be recorded to flash, and some |
1086 | new ones have been marked, then we need to update the stored | |
1087 | bbts. This should only happen once. */ | |
1088 | if (update && td->reserved_block_code) | |
69423d99 | 1089 | nand_update_bbt(mtd, (loff_t)(block - 2) << (this->bbt_erase_shift - 1)); |
1da177e4 LT |
1090 | } |
1091 | } | |
1092 | ||
7cba7b14 SAS |
1093 | /** |
1094 | * verify_bbt_descr - verify the bad block description | |
1534b8b0 RD |
1095 | * @mtd: MTD device structure |
1096 | * @bd: the table to verify | |
7cba7b14 SAS |
1097 | * |
1098 | * This functions performs a few sanity checks on the bad block description | |
1099 | * table. | |
1100 | */ | |
1101 | static void verify_bbt_descr(struct mtd_info *mtd, struct nand_bbt_descr *bd) | |
1102 | { | |
1103 | struct nand_chip *this = mtd->priv; | |
1104 | u32 pattern_len = bd->len; | |
1105 | u32 bits = bd->options & NAND_BBT_NRBITS_MSK; | |
1106 | u32 table_size; | |
1107 | ||
1108 | if (!bd) | |
1109 | return; | |
1110 | BUG_ON((this->options & NAND_USE_FLASH_BBT_NO_OOB) && | |
1111 | !(this->options & NAND_USE_FLASH_BBT)); | |
1112 | BUG_ON(!bits); | |
1113 | ||
1114 | if (bd->options & NAND_BBT_VERSION) | |
1115 | pattern_len++; | |
1116 | ||
1117 | if (bd->options & NAND_BBT_NO_OOB) { | |
1118 | BUG_ON(!(this->options & NAND_USE_FLASH_BBT)); | |
1119 | BUG_ON(!(this->options & NAND_USE_FLASH_BBT_NO_OOB)); | |
1120 | BUG_ON(bd->offs); | |
1121 | if (bd->options & NAND_BBT_VERSION) | |
1122 | BUG_ON(bd->veroffs != bd->len); | |
1123 | BUG_ON(bd->options & NAND_BBT_SAVECONTENT); | |
1124 | } | |
1125 | ||
1126 | if (bd->options & NAND_BBT_PERCHIP) | |
1127 | table_size = this->chipsize >> this->bbt_erase_shift; | |
1128 | else | |
1129 | table_size = mtd->size >> this->bbt_erase_shift; | |
1130 | table_size >>= 3; | |
1131 | table_size *= bits; | |
1132 | if (bd->options & NAND_BBT_NO_OOB) | |
1133 | table_size += pattern_len; | |
1134 | BUG_ON(table_size > (1 << this->bbt_erase_shift)); | |
1135 | } | |
1136 | ||
1da177e4 LT |
1137 | /** |
1138 | * nand_scan_bbt - [NAND Interface] scan, find, read and maybe create bad block table(s) | |
1139 | * @mtd: MTD device structure | |
1140 | * @bd: descriptor for the good/bad block search pattern | |
1141 | * | |
61b03bd7 | 1142 | * The function checks, if a bad block table(s) is/are already |
1da177e4 LT |
1143 | * available. If not it scans the device for manufacturer |
1144 | * marked good / bad blocks and writes the bad block table(s) to | |
1145 | * the selected place. | |
1146 | * | |
1147 | * The bad block table memory is allocated here. It must be freed | |
1148 | * by calling the nand_free_bbt function. | |
1149 | * | |
1150 | */ | |
e0c7d767 | 1151 | int nand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd) |
1da177e4 LT |
1152 | { |
1153 | struct nand_chip *this = mtd->priv; | |
1154 | int len, res = 0; | |
1155 | uint8_t *buf; | |
1156 | struct nand_bbt_descr *td = this->bbt_td; | |
1157 | struct nand_bbt_descr *md = this->bbt_md; | |
1158 | ||
1159 | len = mtd->size >> (this->bbt_erase_shift + 2); | |
95b93a0c BY |
1160 | /* Allocate memory (2bit per block) and clear the memory bad block table */ |
1161 | this->bbt = kzalloc(len, GFP_KERNEL); | |
1da177e4 | 1162 | if (!this->bbt) { |
e0c7d767 | 1163 | printk(KERN_ERR "nand_scan_bbt: Out of memory\n"); |
1da177e4 LT |
1164 | return -ENOMEM; |
1165 | } | |
1da177e4 LT |
1166 | |
1167 | /* If no primary table decriptor is given, scan the device | |
1168 | * to build a memory based bad block table | |
1169 | */ | |
eeada24d AB |
1170 | if (!td) { |
1171 | if ((res = nand_memory_bbt(mtd, bd))) { | |
e0c7d767 DW |
1172 | printk(KERN_ERR "nand_bbt: Can't scan flash and build the RAM-based BBT\n"); |
1173 | kfree(this->bbt); | |
eeada24d AB |
1174 | this->bbt = NULL; |
1175 | } | |
1176 | return res; | |
1177 | } | |
7cba7b14 SAS |
1178 | verify_bbt_descr(mtd, td); |
1179 | verify_bbt_descr(mtd, md); | |
1da177e4 LT |
1180 | |
1181 | /* Allocate a temporary buffer for one eraseblock incl. oob */ | |
1182 | len = (1 << this->bbt_erase_shift); | |
1183 | len += (len >> this->page_shift) * mtd->oobsize; | |
c3f8abf4 | 1184 | buf = vmalloc(len); |
1da177e4 | 1185 | if (!buf) { |
e0c7d767 DW |
1186 | printk(KERN_ERR "nand_bbt: Out of memory\n"); |
1187 | kfree(this->bbt); | |
1da177e4 LT |
1188 | this->bbt = NULL; |
1189 | return -ENOMEM; | |
1190 | } | |
61b03bd7 | 1191 | |
1da177e4 LT |
1192 | /* Is the bbt at a given page ? */ |
1193 | if (td->options & NAND_BBT_ABSPAGE) { | |
e0c7d767 | 1194 | res = read_abs_bbts(mtd, buf, td, md); |
61b03bd7 | 1195 | } else { |
1da177e4 | 1196 | /* Search the bad block table using a pattern in oob */ |
e0c7d767 | 1197 | res = search_read_bbts(mtd, buf, td, md); |
61b03bd7 | 1198 | } |
1da177e4 | 1199 | |
61b03bd7 | 1200 | if (res) |
e0c7d767 | 1201 | res = check_create(mtd, buf, bd); |
61b03bd7 | 1202 | |
1da177e4 | 1203 | /* Prevent the bbt regions from erasing / writing */ |
e0c7d767 | 1204 | mark_bbt_region(mtd, td); |
1da177e4 | 1205 | if (md) |
e0c7d767 | 1206 | mark_bbt_region(mtd, md); |
61b03bd7 | 1207 | |
e0c7d767 | 1208 | vfree(buf); |
1da177e4 LT |
1209 | return res; |
1210 | } | |
1211 | ||
1da177e4 | 1212 | /** |
61b03bd7 | 1213 | * nand_update_bbt - [NAND Interface] update bad block table(s) |
1da177e4 LT |
1214 | * @mtd: MTD device structure |
1215 | * @offs: the offset of the newly marked block | |
1216 | * | |
1217 | * The function updates the bad block table(s) | |
1218 | */ | |
e0c7d767 | 1219 | int nand_update_bbt(struct mtd_info *mtd, loff_t offs) |
1da177e4 LT |
1220 | { |
1221 | struct nand_chip *this = mtd->priv; | |
1222 | int len, res = 0, writeops = 0; | |
1223 | int chip, chipsel; | |
1224 | uint8_t *buf; | |
1225 | struct nand_bbt_descr *td = this->bbt_td; | |
1226 | struct nand_bbt_descr *md = this->bbt_md; | |
1227 | ||
1228 | if (!this->bbt || !td) | |
1229 | return -EINVAL; | |
1230 | ||
1da177e4 LT |
1231 | /* Allocate a temporary buffer for one eraseblock incl. oob */ |
1232 | len = (1 << this->bbt_erase_shift); | |
1233 | len += (len >> this->page_shift) * mtd->oobsize; | |
e0c7d767 | 1234 | buf = kmalloc(len, GFP_KERNEL); |
1da177e4 | 1235 | if (!buf) { |
e0c7d767 | 1236 | printk(KERN_ERR "nand_update_bbt: Out of memory\n"); |
1da177e4 LT |
1237 | return -ENOMEM; |
1238 | } | |
61b03bd7 | 1239 | |
1da177e4 LT |
1240 | writeops = md != NULL ? 0x03 : 0x01; |
1241 | ||
1242 | /* Do we have a bbt per chip ? */ | |
1243 | if (td->options & NAND_BBT_PERCHIP) { | |
e0c7d767 | 1244 | chip = (int)(offs >> this->chip_shift); |
1da177e4 LT |
1245 | chipsel = chip; |
1246 | } else { | |
1247 | chip = 0; | |
1248 | chipsel = -1; | |
1249 | } | |
1250 | ||
1251 | td->version[chip]++; | |
1252 | if (md) | |
61b03bd7 | 1253 | md->version[chip]++; |
1da177e4 LT |
1254 | |
1255 | /* Write the bad block table to the device ? */ | |
1256 | if ((writeops & 0x01) && (td->options & NAND_BBT_WRITE)) { | |
e0c7d767 | 1257 | res = write_bbt(mtd, buf, td, md, chipsel); |
1da177e4 LT |
1258 | if (res < 0) |
1259 | goto out; | |
1260 | } | |
1261 | /* Write the mirror bad block table to the device ? */ | |
1262 | if ((writeops & 0x02) && md && (md->options & NAND_BBT_WRITE)) { | |
e0c7d767 | 1263 | res = write_bbt(mtd, buf, md, td, chipsel); |
1da177e4 LT |
1264 | } |
1265 | ||
e0c7d767 DW |
1266 | out: |
1267 | kfree(buf); | |
1da177e4 LT |
1268 | return res; |
1269 | } | |
1270 | ||
61b03bd7 | 1271 | /* Define some generic bad / good block scan pattern which are used |
171650af | 1272 | * while scanning a device for factory marked good / bad blocks. */ |
1da177e4 LT |
1273 | static uint8_t scan_ff_pattern[] = { 0xff, 0xff }; |
1274 | ||
1da177e4 | 1275 | static struct nand_bbt_descr smallpage_flashbased = { |
6943f8af | 1276 | .options = NAND_BBT_SCAN2NDPAGE, |
c7b28e25 | 1277 | .offs = NAND_SMALL_BADBLOCK_POS, |
1da177e4 LT |
1278 | .len = 1, |
1279 | .pattern = scan_ff_pattern | |
1280 | }; | |
1281 | ||
1282 | static struct nand_bbt_descr largepage_flashbased = { | |
6943f8af | 1283 | .options = NAND_BBT_SCAN2NDPAGE, |
c7b28e25 | 1284 | .offs = NAND_LARGE_BADBLOCK_POS, |
1da177e4 LT |
1285 | .len = 2, |
1286 | .pattern = scan_ff_pattern | |
1287 | }; | |
1288 | ||
1289 | static uint8_t scan_agand_pattern[] = { 0x1C, 0x71, 0xC7, 0x1C, 0x71, 0xC7 }; | |
1290 | ||
1291 | static struct nand_bbt_descr agand_flashbased = { | |
1292 | .options = NAND_BBT_SCANEMPTY | NAND_BBT_SCANALLPAGES, | |
1293 | .offs = 0x20, | |
1294 | .len = 6, | |
1295 | .pattern = scan_agand_pattern | |
1296 | }; | |
1297 | ||
1298 | /* Generic flash bbt decriptors | |
1299 | */ | |
1300 | static uint8_t bbt_pattern[] = {'B', 'b', 't', '0' }; | |
1301 | static uint8_t mirror_pattern[] = {'1', 't', 'b', 'B' }; | |
1302 | ||
1303 | static struct nand_bbt_descr bbt_main_descr = { | |
61b03bd7 | 1304 | .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
1da177e4 LT |
1305 | | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP, |
1306 | .offs = 8, | |
1307 | .len = 4, | |
1308 | .veroffs = 12, | |
1309 | .maxblocks = 4, | |
1310 | .pattern = bbt_pattern | |
1311 | }; | |
1312 | ||
1313 | static struct nand_bbt_descr bbt_mirror_descr = { | |
61b03bd7 | 1314 | .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
1da177e4 LT |
1315 | | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP, |
1316 | .offs = 8, | |
1317 | .len = 4, | |
1318 | .veroffs = 12, | |
1319 | .maxblocks = 4, | |
1320 | .pattern = mirror_pattern | |
1321 | }; | |
1322 | ||
7cba7b14 SAS |
1323 | static struct nand_bbt_descr bbt_main_no_bbt_descr = { |
1324 | .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE | |
1325 | | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP | |
1326 | | NAND_BBT_NO_OOB, | |
1327 | .len = 4, | |
1328 | .veroffs = 4, | |
1329 | .maxblocks = 4, | |
1330 | .pattern = bbt_pattern | |
1331 | }; | |
1332 | ||
1333 | static struct nand_bbt_descr bbt_mirror_no_bbt_descr = { | |
1334 | .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE | |
1335 | | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP | |
1336 | | NAND_BBT_NO_OOB, | |
1337 | .len = 4, | |
1338 | .veroffs = 4, | |
1339 | .maxblocks = 4, | |
1340 | .pattern = mirror_pattern | |
1341 | }; | |
1342 | ||
58373ff0 BN |
1343 | #define BBT_SCAN_OPTIONS (NAND_BBT_SCANLASTPAGE | NAND_BBT_SCAN2NDPAGE | \ |
1344 | NAND_BBT_SCANBYTE1AND6) | |
1345 | /** | |
1346 | * nand_create_default_bbt_descr - [Internal] Creates a BBT descriptor structure | |
1347 | * @this: NAND chip to create descriptor for | |
1348 | * | |
1349 | * This function allocates and initializes a nand_bbt_descr for BBM detection | |
1350 | * based on the properties of "this". The new descriptor is stored in | |
1351 | * this->badblock_pattern. Thus, this->badblock_pattern should be NULL when | |
1352 | * passed to this function. | |
1353 | * | |
1354 | * TODO: Handle other flags, replace other static structs | |
1355 | * (e.g. handle NAND_BBT_FLASH for flash-based BBT, | |
1356 | * replace smallpage_flashbased) | |
1357 | * | |
1358 | */ | |
1359 | static int nand_create_default_bbt_descr(struct nand_chip *this) | |
1360 | { | |
1361 | struct nand_bbt_descr *bd; | |
1362 | if (this->badblock_pattern) { | |
1363 | printk(KERN_WARNING "BBT descr already allocated; not replacing.\n"); | |
1364 | return -EINVAL; | |
1365 | } | |
1366 | bd = kzalloc(sizeof(*bd), GFP_KERNEL); | |
1367 | if (!bd) { | |
1368 | printk(KERN_ERR "nand_create_default_bbt_descr: Out of memory\n"); | |
1369 | return -ENOMEM; | |
1370 | } | |
1371 | bd->options = this->options & BBT_SCAN_OPTIONS; | |
1372 | bd->offs = this->badblockpos; | |
1373 | bd->len = (this->options & NAND_BUSWIDTH_16) ? 2 : 1; | |
1374 | bd->pattern = scan_ff_pattern; | |
1375 | bd->options |= NAND_BBT_DYNAMICSTRUCT; | |
1376 | this->badblock_pattern = bd; | |
1377 | return 0; | |
1378 | } | |
1379 | ||
1da177e4 | 1380 | /** |
61b03bd7 | 1381 | * nand_default_bbt - [NAND Interface] Select a default bad block table for the device |
1da177e4 LT |
1382 | * @mtd: MTD device structure |
1383 | * | |
1384 | * This function selects the default bad block table | |
1385 | * support for the device and calls the nand_scan_bbt function | |
1386 | * | |
1387 | */ | |
e0c7d767 | 1388 | int nand_default_bbt(struct mtd_info *mtd) |
1da177e4 LT |
1389 | { |
1390 | struct nand_chip *this = mtd->priv; | |
61b03bd7 TG |
1391 | |
1392 | /* Default for AG-AND. We must use a flash based | |
1da177e4 LT |
1393 | * bad block table as the devices have factory marked |
1394 | * _good_ blocks. Erasing those blocks leads to loss | |
1395 | * of the good / bad information, so we _must_ store | |
61b03bd7 | 1396 | * this information in a good / bad table during |
1da177e4 | 1397 | * startup |
e0c7d767 | 1398 | */ |
1da177e4 LT |
1399 | if (this->options & NAND_IS_AND) { |
1400 | /* Use the default pattern descriptors */ | |
61b03bd7 | 1401 | if (!this->bbt_td) { |
1da177e4 LT |
1402 | this->bbt_td = &bbt_main_descr; |
1403 | this->bbt_md = &bbt_mirror_descr; | |
61b03bd7 | 1404 | } |
1da177e4 | 1405 | this->options |= NAND_USE_FLASH_BBT; |
e0c7d767 | 1406 | return nand_scan_bbt(mtd, &agand_flashbased); |
1da177e4 | 1407 | } |
61b03bd7 | 1408 | |
1da177e4 LT |
1409 | /* Is a flash based bad block table requested ? */ |
1410 | if (this->options & NAND_USE_FLASH_BBT) { | |
61b03bd7 TG |
1411 | /* Use the default pattern descriptors */ |
1412 | if (!this->bbt_td) { | |
7cba7b14 SAS |
1413 | if (this->options & NAND_USE_FLASH_BBT_NO_OOB) { |
1414 | this->bbt_td = &bbt_main_no_bbt_descr; | |
1415 | this->bbt_md = &bbt_mirror_no_bbt_descr; | |
1416 | } else { | |
1417 | this->bbt_td = &bbt_main_descr; | |
1418 | this->bbt_md = &bbt_mirror_descr; | |
1419 | } | |
1da177e4 LT |
1420 | } |
1421 | if (!this->badblock_pattern) { | |
28318776 | 1422 | this->badblock_pattern = (mtd->writesize > 512) ? &largepage_flashbased : &smallpage_flashbased; |
1da177e4 LT |
1423 | } |
1424 | } else { | |
1425 | this->bbt_td = NULL; | |
1426 | this->bbt_md = NULL; | |
58373ff0 BN |
1427 | if (!this->badblock_pattern) |
1428 | nand_create_default_bbt_descr(this); | |
1da177e4 | 1429 | } |
e0c7d767 | 1430 | return nand_scan_bbt(mtd, this->badblock_pattern); |
1da177e4 LT |
1431 | } |
1432 | ||
1433 | /** | |
61b03bd7 | 1434 | * nand_isbad_bbt - [NAND Interface] Check if a block is bad |
1da177e4 LT |
1435 | * @mtd: MTD device structure |
1436 | * @offs: offset in the device | |
1437 | * @allowbbt: allow access to bad block table region | |
1438 | * | |
1439 | */ | |
e0c7d767 | 1440 | int nand_isbad_bbt(struct mtd_info *mtd, loff_t offs, int allowbbt) |
1da177e4 LT |
1441 | { |
1442 | struct nand_chip *this = mtd->priv; | |
1443 | int block; | |
e0c7d767 | 1444 | uint8_t res; |
61b03bd7 | 1445 | |
1da177e4 | 1446 | /* Get block number * 2 */ |
e0c7d767 | 1447 | block = (int)(offs >> (this->bbt_erase_shift - 1)); |
1da177e4 LT |
1448 | res = (this->bbt[block >> 3] >> (block & 0x06)) & 0x03; |
1449 | ||
e0c7d767 DW |
1450 | DEBUG(MTD_DEBUG_LEVEL2, "nand_isbad_bbt(): bbt info for offs 0x%08x: (block %d) 0x%02x\n", |
1451 | (unsigned int)offs, block >> 1, res); | |
1da177e4 LT |
1452 | |
1453 | switch ((int)res) { | |
e0c7d767 DW |
1454 | case 0x00: |
1455 | return 0; | |
1456 | case 0x01: | |
1457 | return 1; | |
1458 | case 0x02: | |
1459 | return allowbbt ? 0 : 1; | |
1da177e4 LT |
1460 | } |
1461 | return 1; | |
1462 | } | |
1463 | ||
e0c7d767 DW |
1464 | EXPORT_SYMBOL(nand_scan_bbt); |
1465 | EXPORT_SYMBOL(nand_default_bbt); |