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Source at commit 9c70070ba42528526a1f04d3f3b1b218469df065 created 13 years 2 months ago. By Maarten ter Huurne, mtd: nand: Fixed null pointer dereference. | |
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1 | /* |
2 | * drivers/mtd/nand_bbt.c |
3 | * |
4 | * Overview: |
5 | * Bad block table support for the NAND driver |
6 | * |
7 | * Copyright (C) 2004 Thomas Gleixner (tglx@linutronix.de) |
8 | * |
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 | * |
15 | * When nand_scan_bbt is called, then it tries to find the bad block table |
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. |
26 | * If the tables are not versioned, then we "or" the bad block information. |
27 | * If one of the BBTs is out of date or does not exist it is (re)created.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 |
29 | * good / bad blocks and the bad block tables are created. |
30 | * |
31 | * For manufacturer created BBTs like the one found on M-SYS DOC devices |
32 | * the BBT is searched and read but never created |
33 | * |
34 | * The auto generated bad block table is located in the last good blocks |
35 | * of the device. The table is mirrored, so it can be updated eventually. |
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. |
42 | * |
43 | * The table uses 2 bits per block |
44 | * 11b: block is good |
45 | * 00b: block is factory marked bad |
46 | * 01b, 10b: block is marked bad due to wear |
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 |
53 | * |
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 |
58 | * - the space necessary for a bbt in FLASH does not exceed a block boundary |
59 | * |
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> |
67 | #include <linux/bitops.h> |
68 | #include <linux/delay.h> |
69 | #include <linux/vmalloc.h> |
70 | |
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 | |
81 | /** |
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 | */ |
94 | static int check_pattern(uint8_t *buf, int len, int paglen, struct nand_bbt_descr *td) |
95 | { |
96 | int i, end = 0; |
97 | uint8_t *p = buf; |
98 | |
99 | if (td->options & NAND_BBT_NO_OOB) |
100 | return check_pattern_no_oob(buf, td); |
101 | |
102 | end = paglen + td->offs; |
103 | if (td->options & NAND_BBT_SCANEMPTY) { |
104 | for (i = 0; i < end; i++) { |
105 | if (p[i] != 0xff) |
106 | return -1; |
107 | } |
108 | } |
109 | p += end; |
110 | |
111 | /* Compare the pattern */ |
112 | for (i = 0; i < td->len; i++) { |
113 | if (p[i] != td->pattern[i]) |
114 | return -1; |
115 | } |
116 | |
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 | |
139 | if (td->options & NAND_BBT_SCANEMPTY) { |
140 | p += td->len; |
141 | end += td->len; |
142 | for (i = end; i < len; i++) { |
143 | if (*p++ != 0xff) |
144 | return -1; |
145 | } |
146 | } |
147 | return 0; |
148 | } |
149 | |
150 | /** |
151 | * check_short_pattern - [GENERIC] check if a pattern is in the buffer |
152 | * @buf: the buffer to search |
153 | * @td: search pattern descriptor |
154 | * |
155 | * Check for a pattern at the given place. Used to search bad block |
156 | * tables and good / bad block identifiers. Same as check_pattern, but |
157 | * no optional empty check |
158 | * |
159 | */ |
160 | static int check_short_pattern(uint8_t *buf, struct nand_bbt_descr *td) |
161 | { |
162 | int i; |
163 | uint8_t *p = buf; |
164 | |
165 | /* Compare the pattern */ |
166 | for (i = 0; i < td->len; i++) { |
167 | if (p[td->offs + i] != td->pattern[i]) |
168 | return -1; |
169 | } |
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 | } |
177 | return 0; |
178 | } |
179 | |
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 | |
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 |
205 | * @td: the bbt describtion table |
206 | * @offs: offset in the memory table |
207 | * |
208 | * Read the bad block table starting from page. |
209 | * |
210 | */ |
211 | static int read_bbt(struct mtd_info *mtd, uint8_t *buf, int page, int num, |
212 | struct nand_bbt_descr *td, int offs) |
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; |
218 | int bits = td->options & NAND_BBT_NRBITS_MSK; |
219 | uint8_t msk = (uint8_t) ((1 << bits) - 1); |
220 | u32 marker_len; |
221 | int reserved_block_code = td->reserved_block_code; |
222 | |
223 | totlen = (num * bits) >> 3; |
224 | marker_len = add_marker_len(td); |
225 | from = ((loff_t) page) << this->page_shift; |
226 | |
227 | while (totlen) { |
228 | len = min(totlen, (size_t) (1 << this->bbt_erase_shift)); |
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 | } |
238 | res = mtd->read(mtd, from, len, &retlen, buf); |
239 | if (res < 0) { |
240 | if (retlen != len) { |
241 | printk(KERN_INFO "nand_bbt: Error reading bad block table\n"); |
242 | return res; |
243 | } |
244 | printk(KERN_WARNING "nand_bbt: ECC error while reading bad block table\n"); |
245 | } |
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; |
254 | if (reserved_block_code && (tmp == reserved_block_code)) { |
255 | printk(KERN_DEBUG "nand_read_bbt: Reserved block at 0x%012llx\n", |
256 | (loff_t)((offs << 2) + (act >> 1)) << this->bbt_erase_shift); |
257 | this->bbt[offs + (act >> 3)] |= 0x2 << (act & 0x06); |
258 | mtd->ecc_stats.bbtblocks++; |
259 | continue; |
260 | } |
261 | /* Leave it for now, if its matured we can move this |
262 | * message to MTD_DEBUG_LEVEL0 */ |
263 | printk(KERN_DEBUG "nand_read_bbt: Bad block at 0x%012llx\n", |
264 | (loff_t)((offs << 2) + (act >> 1)) << this->bbt_erase_shift); |
265 | /* Factory marked bad or worn out ? */ |
266 | if (tmp == 0) |
267 | this->bbt[offs + (act >> 3)] |= 0x3 << (act & 0x06); |
268 | else |
269 | this->bbt[offs + (act >> 3)] |= 0x1 << (act & 0x06); |
270 | mtd->ecc_stats.badblocks++; |
271 | } |
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 |
283 | * @td: descriptor for the bad block table |
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 | */ |
290 | static int read_abs_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td, int chip) |
291 | { |
292 | struct nand_chip *this = mtd->priv; |
293 | int res = 0, i; |
294 | |
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) |
299 | res = read_bbt(mtd, buf, td->pages[i], |
300 | this->chipsize >> this->bbt_erase_shift, |
301 | td, offs); |
302 | if (res) |
303 | return res; |
304 | offs += this->chipsize >> (this->bbt_erase_shift + 2); |
305 | } |
306 | } else { |
307 | res = read_bbt(mtd, buf, td->pages[0], |
308 | mtd->size >> this->bbt_erase_shift, td, 0); |
309 | if (res) |
310 | return res; |
311 | } |
312 | return 0; |
313 | } |
314 | |
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 | |
331 | /* |
332 | * Scan read raw data from flash |
333 | */ |
334 | static int scan_read_raw_oob(struct mtd_info *mtd, uint8_t *buf, loff_t offs, |
335 | size_t len) |
336 | { |
337 | struct mtd_oob_ops ops; |
338 | int res; |
339 | |
340 | ops.mode = MTD_OOB_RAW; |
341 | ops.ooboffs = 0; |
342 | ops.ooblen = mtd->oobsize; |
343 | |
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; |
365 | } |
366 | |
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 | |
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 | |
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 | |
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 |
407 | * @td: descriptor for the bad block table |
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 | */ |
414 | static int read_abs_bbts(struct mtd_info *mtd, uint8_t *buf, |
415 | struct nand_bbt_descr *td, struct nand_bbt_descr *md) |
416 | { |
417 | struct nand_chip *this = mtd->priv; |
418 | |
419 | /* Read the primary version, if available */ |
420 | if (td->options & NAND_BBT_VERSION) { |
421 | scan_read_raw(mtd, buf, (loff_t)td->pages[0] << this->page_shift, |
422 | mtd->writesize, td); |
423 | td->version[0] = buf[bbt_get_ver_offs(mtd, td)]; |
424 | printk(KERN_DEBUG "Bad block table at page %d, version 0x%02X\n", |
425 | td->pages[0], td->version[0]); |
426 | } |
427 | |
428 | /* Read the mirror version, if available */ |
429 | if (md && (md->options & NAND_BBT_VERSION)) { |
430 | scan_read_raw(mtd, buf, (loff_t)md->pages[0] << this->page_shift, |
431 | mtd->writesize, td); |
432 | md->version[0] = buf[bbt_get_ver_offs(mtd, md)]; |
433 | printk(KERN_DEBUG "Bad block table at page %d, version 0x%02X\n", |
434 | md->pages[0], md->version[0]); |
435 | } |
436 | return 1; |
437 | } |
438 | |
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 | |
448 | ret = scan_read_raw_oob(mtd, buf, offs, readlen); |
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 | |
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 | |
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 | */ |
503 | static int create_bbt(struct mtd_info *mtd, uint8_t *buf, |
504 | struct nand_bbt_descr *bd, int chip) |
505 | { |
506 | struct nand_chip *this = mtd->priv; |
507 | int i, numblocks, len, scanlen; |
508 | int startblock; |
509 | loff_t from; |
510 | size_t readlen; |
511 | |
512 | printk(KERN_INFO "Scanning device for bad blocks\n"); |
513 | |
514 | if (bd->options & NAND_BBT_SCANALLPAGES) |
515 | len = 1 << (this->bbt_erase_shift - this->page_shift); |
516 | else if (bd->options & NAND_BBT_SCAN2NDPAGE) |
517 | len = 2; |
518 | else |
519 | len = 1; |
520 | |
521 | if (!(bd->options & NAND_BBT_SCANEMPTY)) { |
522 | /* We need only read few bytes from the OOB area */ |
523 | scanlen = 0; |
524 | readlen = bd->len; |
525 | } else { |
526 | /* Full page content should be read */ |
527 | scanlen = mtd->writesize + mtd->oobsize; |
528 | readlen = len * mtd->writesize; |
529 | } |
530 | |
531 | if (chip == -1) { |
532 | /* Note that numblocks is 2 * (real numblocks) here, see i+=2 |
533 | * below as it makes shifting and masking less painful */ |
534 | numblocks = mtd->size >> (this->bbt_erase_shift - 1); |
535 | startblock = 0; |
536 | from = 0; |
537 | } else { |
538 | if (chip >= this->numchips) { |
539 | printk(KERN_WARNING "create_bbt(): chipnr (%d) > available chips (%d)\n", |
540 | chip + 1, this->numchips); |
541 | return -EINVAL; |
542 | } |
543 | numblocks = this->chipsize >> (this->bbt_erase_shift - 1); |
544 | startblock = chip * numblocks; |
545 | numblocks += startblock; |
546 | from = (loff_t)startblock << (this->bbt_erase_shift - 1); |
547 | } |
548 | |
549 | if (this->options & NAND_BBT_SCANLASTPAGE) |
550 | from += mtd->erasesize - (mtd->writesize * len); |
551 | |
552 | for (i = startblock; i < numblocks;) { |
553 | int ret; |
554 | |
555 | BUG_ON(bd->options & NAND_BBT_NO_OOB); |
556 | |
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); |
568 | printk(KERN_WARNING "Bad eraseblock %d at 0x%012llx\n", |
569 | i >> 1, (unsigned long long)from); |
570 | mtd->ecc_stats.badblocks++; |
571 | } |
572 | |
573 | i += 2; |
574 | from += (1 << this->bbt_erase_shift); |
575 | } |
576 | return 0; |
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. |
586 | * Search is preformed either from the beginning up or from the end of |
587 | * the device downwards. The search starts always at the start of a |
588 | * block. |
589 | * If the option NAND_BBT_PERCHIP is given, each chip is searched |
590 | * for a bbt, which contains the bad block information of this chip. |
591 | * This is necessary to provide support for certain DOC devices. |
592 | * |
593 | * The bbt ident pattern resides in the oob area of the first page |
594 | * in a block. |
595 | */ |
596 | static int search_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td) |
597 | { |
598 | struct nand_chip *this = mtd->priv; |
599 | int i, chips; |
600 | int bits, startblock, block, dir; |
601 | int scanlen = mtd->writesize + mtd->oobsize; |
602 | int bbtblocks; |
603 | int blocktopage = this->bbt_erase_shift - this->page_shift; |
604 | |
605 | /* Search direction top -> down ? */ |
606 | if (td->options & NAND_BBT_LASTBLOCK) { |
607 | startblock = (mtd->size >> this->bbt_erase_shift) - 1; |
608 | dir = -1; |
609 | } else { |
610 | startblock = 0; |
611 | dir = 1; |
612 | } |
613 | |
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 | } |
623 | |
624 | /* Number of bits for each erase block in the bbt */ |
625 | bits = td->options & NAND_BBT_NRBITS_MSK; |
626 | |
627 | for (i = 0; i < chips; i++) { |
628 | /* Reset version information */ |
629 | td->version[i] = 0; |
630 | td->pages[i] = -1; |
631 | /* Scan the maximum number of blocks */ |
632 | for (block = 0; block < td->maxblocks; block++) { |
633 | |
634 | int actblock = startblock + dir * block; |
635 | loff_t offs = (loff_t)actblock << this->bbt_erase_shift; |
636 | |
637 | /* Read first page */ |
638 | scan_read_raw(mtd, buf, offs, mtd->writesize, td); |
639 | if (!check_pattern(buf, scanlen, mtd->writesize, td)) { |
640 | td->pages[i] = actblock << blocktopage; |
641 | if (td->options & NAND_BBT_VERSION) { |
642 | offs = bbt_get_ver_offs(mtd, td); |
643 | td->version[i] = buf[offs]; |
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) |
653 | printk(KERN_WARNING "Bad block table not found for chip %d\n", i); |
654 | else |
655 | printk(KERN_DEBUG "Bad block table found at page %d, version 0x%02X\n", td->pages[i], |
656 | td->version[i]); |
657 | } |
658 | return 0; |
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 |
665 | * @td: descriptor for the bad block table |
666 | * @md: descriptor for the bad block table mirror |
667 | * |
668 | * Search and read the bad block table(s) |
669 | */ |
670 | static int search_read_bbts(struct mtd_info *mtd, uint8_t * buf, struct nand_bbt_descr *td, struct nand_bbt_descr *md) |
671 | { |
672 | /* Search the primary table */ |
673 | search_bbt(mtd, buf, td); |
674 | |
675 | /* Search the mirror table */ |
676 | if (md) |
677 | search_bbt(mtd, buf, md); |
678 | |
679 | /* Force result check */ |
680 | return 1; |
681 | } |
682 | |
683 | /** |
684 | * write_bbt - [GENERIC] (Re)write the bad block table |
685 | * |
686 | * @mtd: MTD device structure |
687 | * @buf: temporary buffer |
688 | * @td: descriptor for the bad block table |
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 | */ |
695 | static int write_bbt(struct mtd_info *mtd, uint8_t *buf, |
696 | struct nand_bbt_descr *td, struct nand_bbt_descr *md, |
697 | int chipsel) |
698 | { |
699 | struct nand_chip *this = mtd->priv; |
700 | struct erase_info einfo; |
701 | int i, j, res, chip = 0; |
702 | int bits, startblock, dir, page, offs, numblocks, sft, sftmsk; |
703 | int nrchips, bbtoffs, pageoffs, ooboffs; |
704 | uint8_t msk[4]; |
705 | uint8_t rcode = td->reserved_block_code; |
706 | size_t retlen, len = 0; |
707 | loff_t to; |
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; |
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) { |
719 | numblocks = (int)(this->chipsize >> this->bbt_erase_shift); |
720 | /* Full device write or specific chip ? */ |
721 | if (chipsel == -1) { |
722 | nrchips = this->numchips; |
723 | } else { |
724 | nrchips = chipsel + 1; |
725 | chip = chipsel; |
726 | } |
727 | } else { |
728 | numblocks = (int)(mtd->size >> this->bbt_erase_shift); |
729 | nrchips = 1; |
730 | } |
731 | |
732 | /* Loop through the chips */ |
733 | for (; chip < nrchips; chip++) { |
734 | |
735 | /* There was already a version of the table, reuse the page |
736 | * This applies for absolute placement too, as we have the |
737 | * page nr. in td->pages. |
738 | */ |
739 | if (td->pages[chip] != -1) { |
740 | page = td->pages[chip]; |
741 | goto write; |
742 | } |
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; |
752 | } |
753 | |
754 | for (i = 0; i < td->maxblocks; i++) { |
755 | int block = startblock + dir * i; |
756 | /* Check, if the block is bad */ |
757 | switch ((this->bbt[block >> 2] >> |
758 | (2 * (block & 0x03))) & 0x03) { |
759 | case 0x01: |
760 | case 0x03: |
761 | continue; |
762 | } |
763 | page = block << |
764 | (this->bbt_erase_shift - this->page_shift); |
765 | /* Check, if the block is used by the mirror table */ |
766 | if (!md || md->pages[chip] != page) |
767 | goto write; |
768 | } |
769 | printk(KERN_ERR "No space left to write bad block table\n"); |
770 | return -ENOSPC; |
771 | write: |
772 | |
773 | /* Set up shift count and masks for the flash table */ |
774 | bits = td->options & NAND_BBT_NRBITS_MSK; |
775 | msk[2] = ~rcode; |
776 | switch (bits) { |
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; |
789 | default: return -EINVAL; |
790 | } |
791 | |
792 | bbtoffs = chip * (numblocks >> 2); |
793 | |
794 | to = ((loff_t) page) << this->page_shift; |
795 | |
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; |
801 | res = mtd->read(mtd, to, len, &retlen, buf); |
802 | if (res < 0) { |
803 | if (retlen != len) { |
804 | printk(KERN_INFO "nand_bbt: Error " |
805 | "reading block for writing " |
806 | "the bad block table\n"); |
807 | return res; |
808 | } |
809 | printk(KERN_WARNING "nand_bbt: ECC error " |
810 | "while reading block for writing " |
811 | "bad block table\n"); |
812 | } |
813 | /* Read oob data */ |
814 | ops.ooblen = (len >> this->page_shift) * mtd->oobsize; |
815 | ops.oobbuf = &buf[len]; |
816 | res = mtd->read_oob(mtd, to + mtd->writesize, &ops); |
817 | if (res < 0 || ops.oobretlen != ops.ooblen) |
818 | goto outerr; |
819 | |
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 */ |
824 | memset(&buf[offs], 0xff, (size_t) (numblocks >> sft)); |
825 | ooboffs = len + (pageoffs * mtd->oobsize); |
826 | |
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); |
842 | } else { |
843 | /* Calc length */ |
844 | len = (size_t) (numblocks >> sft); |
845 | /* Make it page aligned ! */ |
846 | len = ALIGN(len, mtd->writesize); |
847 | /* Preset the buffer with 0xff */ |
848 | memset(buf, 0xff, len + |
849 | (len >> this->page_shift)* mtd->oobsize); |
850 | offs = 0; |
851 | ooboffs = len; |
852 | /* Pattern is located in oob area of first page */ |
853 | memcpy(&buf[ooboffs + td->offs], td->pattern, td->len); |
854 | } |
855 | |
856 | if (td->options & NAND_BBT_VERSION) |
857 | buf[ooboffs + td->veroffs] = td->version[chip]; |
858 | |
859 | /* walk through the memory table */ |
860 | for (i = 0; i < numblocks;) { |
861 | uint8_t dat; |
862 | dat = this->bbt[bbtoffs + (i >> 2)]; |
863 | for (j = 0; j < 4; j++, i++) { |
864 | int sftcnt = (i << (3 - sft)) & sftmsk; |
865 | /* Do not store the reserved bbt blocks ! */ |
866 | buf[offs + (i >> sft)] &= |
867 | ~(msk[dat & 0x03] << sftcnt); |
868 | dat >>= 2; |
869 | } |
870 | } |
871 | |
872 | memset(&einfo, 0, sizeof(einfo)); |
873 | einfo.mtd = mtd; |
874 | einfo.addr = to; |
875 | einfo.len = 1 << this->bbt_erase_shift; |
876 | res = nand_erase_nand(mtd, &einfo, 1); |
877 | if (res < 0) |
878 | goto outerr; |
879 | |
880 | res = scan_write_bbt(mtd, to, len, buf, |
881 | td->options & NAND_BBT_NO_OOB ? NULL : |
882 | &buf[len]); |
883 | if (res < 0) |
884 | goto outerr; |
885 | |
886 | printk(KERN_DEBUG "Bad block table written to 0x%012llx, version " |
887 | "0x%02X\n", (unsigned long long)to, td->version[chip]); |
888 | |
889 | /* Mark it as used */ |
890 | td->pages[chip] = page; |
891 | } |
892 | return 0; |
893 | |
894 | outerr: |
895 | printk(KERN_WARNING |
896 | "nand_bbt: Error while writing bad block table %d\n", res); |
897 | return res; |
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 | * |
905 | * The function creates a memory based bbt by scanning the device |
906 | * for manufacturer / software marked good / bad blocks |
907 | */ |
908 | static inline int nand_memory_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd) |
909 | { |
910 | struct nand_chip *this = mtd->priv; |
911 | |
912 | bd->options &= ~NAND_BBT_SCANEMPTY; |
913 | return create_bbt(mtd, this->buffers->databuf, bd, -1); |
914 | } |
915 | |
916 | /** |
917 | * check_create - [GENERIC] create and write bbt(s) if necessary |
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 |
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 |
926 | * version nr. of one table is less than the other |
927 | */ |
928 | static int check_create(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *bd) |
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 ? */ |
937 | if (td->options & NAND_BBT_PERCHIP) |
938 | chips = this->numchips; |
939 | else |
940 | chips = 1; |
941 | |
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) { |
956 | rd = md; |
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; |
974 | } |
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 | } |
996 | create: |
997 | /* Create the bad block table by scanning the device ? */ |
998 | if (!(td->options & NAND_BBT_CREATE)) |
999 | continue; |
1000 | |
1001 | /* Create the table in memory by scanning the chip(s) */ |
1002 | if (!(this->options & NAND_CREATE_EMPTY_BBT)) |
1003 | create_bbt(mtd, buf, bd, chipsel); |
1004 | |
1005 | td->version[i] = 1; |
1006 | if (md) |
1007 | md->version[i] = 1; |
1008 | writecheck: |
1009 | /* read back first ? */ |
1010 | if (rd) |
1011 | read_abs_bbt(mtd, buf, rd, chipsel); |
1012 | /* If they weren't versioned, read both. */ |
1013 | if (rd2) |
1014 | read_abs_bbt(mtd, buf, rd2, chipsel); |
1015 | |
1016 | /* Write the bad block table to the device ? */ |
1017 | if ((writeops & 0x01) && (td->options & NAND_BBT_WRITE)) { |
1018 | res = write_bbt(mtd, buf, td, md, chipsel); |
1019 | if (res < 0) |
1020 | return res; |
1021 | } |
1022 | |
1023 | /* Write the mirror bad block table to the device ? */ |
1024 | if ((writeops & 0x02) && md && (md->options & NAND_BBT_WRITE)) { |
1025 | res = write_bbt(mtd, buf, md, td, chipsel); |
1026 | if (res < 0) |
1027 | return res; |
1028 | } |
1029 | } |
1030 | return 0; |
1031 | } |
1032 | |
1033 | /** |
1034 | * mark_bbt_regions - [GENERIC] mark the bad block table regions |
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 | */ |
1042 | static void mark_bbt_region(struct mtd_info *mtd, struct nand_bbt_descr *td) |
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); |
1055 | } |
1056 | |
1057 | for (i = 0; i < chips; i++) { |
1058 | if ((td->options & NAND_BBT_ABSPAGE) || |
1059 | !(td->options & NAND_BBT_WRITE)) { |
1060 | if (td->pages[i] == -1) |
1061 | continue; |
1062 | block = td->pages[i] >> (this->bbt_erase_shift - this->page_shift); |
1063 | block <<= 1; |
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) |
1068 | nand_update_bbt(mtd, (loff_t)block << (this->bbt_erase_shift - 1)); |
1069 | continue; |
1070 | } |
1071 | update = 0; |
1072 | if (td->options & NAND_BBT_LASTBLOCK) |
1073 | block = ((i + 1) * nrblocks) - td->maxblocks; |
1074 | else |
1075 | block = i * nrblocks; |
1076 | block <<= 1; |
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; |
1081 | if (oldval != newval) |
1082 | update = 1; |
1083 | block += 2; |
1084 | } |
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) |
1089 | nand_update_bbt(mtd, (loff_t)(block - 2) << (this->bbt_erase_shift - 1)); |
1090 | } |
1091 | } |
1092 | |
1093 | /** |
1094 | * verify_bbt_descr - verify the bad block description |
1095 | * @bd: the table to verify |
1096 | * |
1097 | * This functions performs a few sanity checks on the bad block description |
1098 | * table. |
1099 | */ |
1100 | static void verify_bbt_descr(struct mtd_info *mtd, struct nand_bbt_descr *bd) |
1101 | { |
1102 | struct nand_chip *this = mtd->priv; |
1103 | u32 pattern_len, bits, table_size; |
1104 | |
1105 | if (!bd) |
1106 | return; |
1107 | |
1108 | pattern_len = bd->len; |
1109 | bits = bd->options & NAND_BBT_NRBITS_MSK; |
1110 | |
1111 | BUG_ON((this->options & NAND_USE_FLASH_BBT_NO_OOB) && |
1112 | !(this->options & NAND_USE_FLASH_BBT)); |
1113 | BUG_ON(!bits); |
1114 | |
1115 | if (bd->options & NAND_BBT_VERSION) |
1116 | pattern_len++; |
1117 | |
1118 | if (bd->options & NAND_BBT_NO_OOB) { |
1119 | BUG_ON(!(this->options & NAND_USE_FLASH_BBT)); |
1120 | BUG_ON(!(this->options & NAND_USE_FLASH_BBT_NO_OOB)); |
1121 | BUG_ON(bd->offs); |
1122 | if (bd->options & NAND_BBT_VERSION) |
1123 | BUG_ON(bd->veroffs != bd->len); |
1124 | BUG_ON(bd->options & NAND_BBT_SAVECONTENT); |
1125 | } |
1126 | |
1127 | if (bd->options & NAND_BBT_PERCHIP) |
1128 | table_size = this->chipsize >> this->bbt_erase_shift; |
1129 | else |
1130 | table_size = mtd->size >> this->bbt_erase_shift; |
1131 | table_size >>= 3; |
1132 | table_size *= bits; |
1133 | if (bd->options & NAND_BBT_NO_OOB) |
1134 | table_size += pattern_len; |
1135 | BUG_ON(table_size > (1 << this->bbt_erase_shift)); |
1136 | } |
1137 | |
1138 | /** |
1139 | * nand_scan_bbt - [NAND Interface] scan, find, read and maybe create bad block table(s) |
1140 | * @mtd: MTD device structure |
1141 | * @bd: descriptor for the good/bad block search pattern |
1142 | * |
1143 | * The function checks, if a bad block table(s) is/are already |
1144 | * available. If not it scans the device for manufacturer |
1145 | * marked good / bad blocks and writes the bad block table(s) to |
1146 | * the selected place. |
1147 | * |
1148 | * The bad block table memory is allocated here. It must be freed |
1149 | * by calling the nand_free_bbt function. |
1150 | * |
1151 | */ |
1152 | int nand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd) |
1153 | { |
1154 | struct nand_chip *this = mtd->priv; |
1155 | int len, res = 0; |
1156 | uint8_t *buf; |
1157 | struct nand_bbt_descr *td = this->bbt_td; |
1158 | struct nand_bbt_descr *md = this->bbt_md; |
1159 | |
1160 | len = mtd->size >> (this->bbt_erase_shift + 2); |
1161 | /* Allocate memory (2bit per block) and clear the memory bad block table */ |
1162 | this->bbt = kzalloc(len, GFP_KERNEL); |
1163 | if (!this->bbt) { |
1164 | printk(KERN_ERR "nand_scan_bbt: Out of memory\n"); |
1165 | return -ENOMEM; |
1166 | } |
1167 | |
1168 | /* If no primary table decriptor is given, scan the device |
1169 | * to build a memory based bad block table |
1170 | */ |
1171 | if (!td) { |
1172 | if ((res = nand_memory_bbt(mtd, bd))) { |
1173 | printk(KERN_ERR "nand_bbt: Can't scan flash and build the RAM-based BBT\n"); |
1174 | kfree(this->bbt); |
1175 | this->bbt = NULL; |
1176 | } |
1177 | return res; |
1178 | } |
1179 | verify_bbt_descr(mtd, td); |
1180 | verify_bbt_descr(mtd, md); |
1181 | |
1182 | /* Allocate a temporary buffer for one eraseblock incl. oob */ |
1183 | len = (1 << this->bbt_erase_shift); |
1184 | len += (len >> this->page_shift) * mtd->oobsize; |
1185 | buf = vmalloc(len); |
1186 | if (!buf) { |
1187 | printk(KERN_ERR "nand_bbt: Out of memory\n"); |
1188 | kfree(this->bbt); |
1189 | this->bbt = NULL; |
1190 | return -ENOMEM; |
1191 | } |
1192 | |
1193 | /* Is the bbt at a given page ? */ |
1194 | if (td->options & NAND_BBT_ABSPAGE) { |
1195 | res = read_abs_bbts(mtd, buf, td, md); |
1196 | } else { |
1197 | /* Search the bad block table using a pattern in oob */ |
1198 | res = search_read_bbts(mtd, buf, td, md); |
1199 | } |
1200 | |
1201 | if (res) |
1202 | res = check_create(mtd, buf, bd); |
1203 | |
1204 | /* Prevent the bbt regions from erasing / writing */ |
1205 | mark_bbt_region(mtd, td); |
1206 | if (md) |
1207 | mark_bbt_region(mtd, md); |
1208 | |
1209 | vfree(buf); |
1210 | return res; |
1211 | } |
1212 | |
1213 | /** |
1214 | * nand_update_bbt - [NAND Interface] update bad block table(s) |
1215 | * @mtd: MTD device structure |
1216 | * @offs: the offset of the newly marked block |
1217 | * |
1218 | * The function updates the bad block table(s) |
1219 | */ |
1220 | int nand_update_bbt(struct mtd_info *mtd, loff_t offs) |
1221 | { |
1222 | struct nand_chip *this = mtd->priv; |
1223 | int len, res = 0, writeops = 0; |
1224 | int chip, chipsel; |
1225 | uint8_t *buf; |
1226 | struct nand_bbt_descr *td = this->bbt_td; |
1227 | struct nand_bbt_descr *md = this->bbt_md; |
1228 | |
1229 | if (!this->bbt || !td) |
1230 | return -EINVAL; |
1231 | |
1232 | /* Allocate a temporary buffer for one eraseblock incl. oob */ |
1233 | len = (1 << this->bbt_erase_shift); |
1234 | len += (len >> this->page_shift) * mtd->oobsize; |
1235 | buf = kmalloc(len, GFP_KERNEL); |
1236 | if (!buf) { |
1237 | printk(KERN_ERR "nand_update_bbt: Out of memory\n"); |
1238 | return -ENOMEM; |
1239 | } |
1240 | |
1241 | writeops = md != NULL ? 0x03 : 0x01; |
1242 | |
1243 | /* Do we have a bbt per chip ? */ |
1244 | if (td->options & NAND_BBT_PERCHIP) { |
1245 | chip = (int)(offs >> this->chip_shift); |
1246 | chipsel = chip; |
1247 | } else { |
1248 | chip = 0; |
1249 | chipsel = -1; |
1250 | } |
1251 | |
1252 | td->version[chip]++; |
1253 | if (md) |
1254 | md->version[chip]++; |
1255 | |
1256 | /* Write the bad block table to the device ? */ |
1257 | if ((writeops & 0x01) && (td->options & NAND_BBT_WRITE)) { |
1258 | res = write_bbt(mtd, buf, td, md, chipsel); |
1259 | if (res < 0) |
1260 | goto out; |
1261 | } |
1262 | /* Write the mirror bad block table to the device ? */ |
1263 | if ((writeops & 0x02) && md && (md->options & NAND_BBT_WRITE)) { |
1264 | res = write_bbt(mtd, buf, md, td, chipsel); |
1265 | } |
1266 | |
1267 | out: |
1268 | kfree(buf); |
1269 | return res; |
1270 | } |
1271 | |
1272 | /* Define some generic bad / good block scan pattern which are used |
1273 | * while scanning a device for factory marked good / bad blocks. */ |
1274 | static uint8_t scan_ff_pattern[] = { 0xff, 0xff }; |
1275 | |
1276 | static struct nand_bbt_descr smallpage_flashbased = { |
1277 | .options = NAND_BBT_SCAN2NDPAGE, |
1278 | .offs = NAND_SMALL_BADBLOCK_POS, |
1279 | .len = 1, |
1280 | .pattern = scan_ff_pattern |
1281 | }; |
1282 | |
1283 | static struct nand_bbt_descr largepage_flashbased = { |
1284 | .options = NAND_BBT_SCAN2NDPAGE, |
1285 | .offs = NAND_LARGE_BADBLOCK_POS, |
1286 | .len = 2, |
1287 | .pattern = scan_ff_pattern |
1288 | }; |
1289 | |
1290 | static uint8_t scan_agand_pattern[] = { 0x1C, 0x71, 0xC7, 0x1C, 0x71, 0xC7 }; |
1291 | |
1292 | static struct nand_bbt_descr agand_flashbased = { |
1293 | .options = NAND_BBT_SCANEMPTY | NAND_BBT_SCANALLPAGES, |
1294 | .offs = 0x20, |
1295 | .len = 6, |
1296 | .pattern = scan_agand_pattern |
1297 | }; |
1298 | |
1299 | /* Generic flash bbt decriptors |
1300 | */ |
1301 | static uint8_t bbt_pattern[] = {'B', 'b', 't', '0' }; |
1302 | static uint8_t mirror_pattern[] = {'1', 't', 'b', 'B' }; |
1303 | |
1304 | static struct nand_bbt_descr bbt_main_descr = { |
1305 | .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
1306 | | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP, |
1307 | .offs = 8, |
1308 | .len = 4, |
1309 | .veroffs = 12, |
1310 | .maxblocks = 4, |
1311 | .pattern = bbt_pattern |
1312 | }; |
1313 | |
1314 | static struct nand_bbt_descr bbt_mirror_descr = { |
1315 | .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
1316 | | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP, |
1317 | .offs = 8, |
1318 | .len = 4, |
1319 | .veroffs = 12, |
1320 | .maxblocks = 4, |
1321 | .pattern = mirror_pattern |
1322 | }; |
1323 | |
1324 | static struct nand_bbt_descr bbt_main_no_bbt_descr = { |
1325 | .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
1326 | | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP |
1327 | | NAND_BBT_NO_OOB, |
1328 | .len = 4, |
1329 | .veroffs = 4, |
1330 | .maxblocks = 4, |
1331 | .pattern = bbt_pattern |
1332 | }; |
1333 | |
1334 | static struct nand_bbt_descr bbt_mirror_no_bbt_descr = { |
1335 | .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
1336 | | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP |
1337 | | NAND_BBT_NO_OOB, |
1338 | .len = 4, |
1339 | .veroffs = 4, |
1340 | .maxblocks = 4, |
1341 | .pattern = mirror_pattern |
1342 | }; |
1343 | |
1344 | #define BBT_SCAN_OPTIONS (NAND_BBT_SCANLASTPAGE | NAND_BBT_SCAN2NDPAGE | \ |
1345 | NAND_BBT_SCANBYTE1AND6) |
1346 | /** |
1347 | * nand_create_default_bbt_descr - [Internal] Creates a BBT descriptor structure |
1348 | * @this: NAND chip to create descriptor for |
1349 | * |
1350 | * This function allocates and initializes a nand_bbt_descr for BBM detection |
1351 | * based on the properties of "this". The new descriptor is stored in |
1352 | * this->badblock_pattern. Thus, this->badblock_pattern should be NULL when |
1353 | * passed to this function. |
1354 | * |
1355 | * TODO: Handle other flags, replace other static structs |
1356 | * (e.g. handle NAND_BBT_FLASH for flash-based BBT, |
1357 | * replace smallpage_flashbased) |
1358 | * |
1359 | */ |
1360 | static int nand_create_default_bbt_descr(struct nand_chip *this) |
1361 | { |
1362 | struct nand_bbt_descr *bd; |
1363 | if (this->badblock_pattern) { |
1364 | printk(KERN_WARNING "BBT descr already allocated; not replacing.\n"); |
1365 | return -EINVAL; |
1366 | } |
1367 | bd = kzalloc(sizeof(*bd), GFP_KERNEL); |
1368 | if (!bd) { |
1369 | printk(KERN_ERR "nand_create_default_bbt_descr: Out of memory\n"); |
1370 | return -ENOMEM; |
1371 | } |
1372 | bd->options = this->options & BBT_SCAN_OPTIONS; |
1373 | bd->offs = this->badblockpos; |
1374 | bd->len = (this->options & NAND_BUSWIDTH_16) ? 2 : 1; |
1375 | bd->pattern = scan_ff_pattern; |
1376 | bd->options |= NAND_BBT_DYNAMICSTRUCT; |
1377 | this->badblock_pattern = bd; |
1378 | return 0; |
1379 | } |
1380 | |
1381 | /** |
1382 | * nand_default_bbt - [NAND Interface] Select a default bad block table for the device |
1383 | * @mtd: MTD device structure |
1384 | * |
1385 | * This function selects the default bad block table |
1386 | * support for the device and calls the nand_scan_bbt function |
1387 | * |
1388 | */ |
1389 | int nand_default_bbt(struct mtd_info *mtd) |
1390 | { |
1391 | struct nand_chip *this = mtd->priv; |
1392 | |
1393 | /* Default for AG-AND. We must use a flash based |
1394 | * bad block table as the devices have factory marked |
1395 | * _good_ blocks. Erasing those blocks leads to loss |
1396 | * of the good / bad information, so we _must_ store |
1397 | * this information in a good / bad table during |
1398 | * startup |
1399 | */ |
1400 | if (this->options & NAND_IS_AND) { |
1401 | /* Use the default pattern descriptors */ |
1402 | if (!this->bbt_td) { |
1403 | this->bbt_td = &bbt_main_descr; |
1404 | this->bbt_md = &bbt_mirror_descr; |
1405 | } |
1406 | this->options |= NAND_USE_FLASH_BBT; |
1407 | return nand_scan_bbt(mtd, &agand_flashbased); |
1408 | } |
1409 | |
1410 | /* Is a flash based bad block table requested ? */ |
1411 | if (this->options & NAND_USE_FLASH_BBT) { |
1412 | /* Use the default pattern descriptors */ |
1413 | if (!this->bbt_td) { |
1414 | if (this->options & NAND_USE_FLASH_BBT_NO_OOB) { |
1415 | this->bbt_td = &bbt_main_no_bbt_descr; |
1416 | this->bbt_md = &bbt_mirror_no_bbt_descr; |
1417 | } else { |
1418 | this->bbt_td = &bbt_main_descr; |
1419 | this->bbt_md = &bbt_mirror_descr; |
1420 | } |
1421 | } |
1422 | if (!this->badblock_pattern) { |
1423 | this->badblock_pattern = (mtd->writesize > 512) ? &largepage_flashbased : &smallpage_flashbased; |
1424 | } |
1425 | } else { |
1426 | this->bbt_td = NULL; |
1427 | this->bbt_md = NULL; |
1428 | if (!this->badblock_pattern) |
1429 | nand_create_default_bbt_descr(this); |
1430 | } |
1431 | return nand_scan_bbt(mtd, this->badblock_pattern); |
1432 | } |
1433 | |
1434 | /** |
1435 | * nand_isbad_bbt - [NAND Interface] Check if a block is bad |
1436 | * @mtd: MTD device structure |
1437 | * @offs: offset in the device |
1438 | * @allowbbt: allow access to bad block table region |
1439 | * |
1440 | */ |
1441 | int nand_isbad_bbt(struct mtd_info *mtd, loff_t offs, int allowbbt) |
1442 | { |
1443 | struct nand_chip *this = mtd->priv; |
1444 | int block; |
1445 | uint8_t res; |
1446 | |
1447 | /* Get block number * 2 */ |
1448 | block = (int)(offs >> (this->bbt_erase_shift - 1)); |
1449 | res = (this->bbt[block >> 3] >> (block & 0x06)) & 0x03; |
1450 | |
1451 | DEBUG(MTD_DEBUG_LEVEL2, "nand_isbad_bbt(): bbt info for offs 0x%08x: (block %d) 0x%02x\n", |
1452 | (unsigned int)offs, block >> 1, res); |
1453 | |
1454 | switch ((int)res) { |
1455 | case 0x00: |
1456 | return 0; |
1457 | case 0x01: |
1458 | return 1; |
1459 | case 0x02: |
1460 | return allowbbt ? 0 : 1; |
1461 | } |
1462 | return 1; |
1463 | } |
1464 | |
1465 | EXPORT_SYMBOL(nand_scan_bbt); |
1466 | EXPORT_SYMBOL(nand_default_bbt); |
1467 |
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