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932394ac WD |
1 | /* |
2 | * drivers/mtd/nand_bbt.c | |
3 | * | |
4 | * Overview: | |
5 | * Bad block table support for the NAND driver | |
ac7eb8a3 | 6 | * |
932394ac WD |
7 | * Copyright (C) 2004 Thomas Gleixner (tglx@linutronix.de) |
8 | * | |
932394ac WD |
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 | * | |
ac7eb8a3 WD |
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 a bbt is found | |
17 | * then the contents are read and the memory based bbt is created. If a | |
932394ac | 18 | * mirrored bbt is selected then the mirror is searched too and the |
ac7eb8a3 | 19 | * versions are compared. If the mirror has a greater version number |
932394ac WD |
20 | * than the mirror bbt is used to build the memory based bbt. |
21 | * If the tables are not versioned, then we "or" the bad block information. | |
ac7eb8a3 WD |
22 | * If one of the bbt's is out of date or does not exist it is (re)created. |
23 | * If no bbt exists at all then the device is scanned for factory marked | |
24 | * good / bad blocks and the bad block tables are created. | |
932394ac | 25 | * |
ac7eb8a3 | 26 | * For manufacturer created bbts like the one found on M-SYS DOC devices |
932394ac WD |
27 | * the bbt is searched and read but never created |
28 | * | |
ac7eb8a3 WD |
29 | * The autogenerated bad block table is located in the last good blocks |
30 | * of the device. The table is mirrored, so it can be updated eventually. | |
31 | * The table is marked in the oob area with an ident pattern and a version | |
932394ac WD |
32 | * number which indicates which of both tables is more up to date. |
33 | * | |
34 | * The table uses 2 bits per block | |
53677ef1 WD |
35 | * 11b: block is good |
36 | * 00b: block is factory marked bad | |
37 | * 01b, 10b: block is marked bad due to wear | |
932394ac WD |
38 | * |
39 | * The memory bad block table uses the following scheme: | |
40 | * 00b: block is good | |
41 | * 01b: block is marked bad due to wear | |
42 | * 10b: block is reserved (to protect the bbt area) | |
43 | * 11b: block is factory marked bad | |
ac7eb8a3 | 44 | * |
932394ac WD |
45 | * Multichip devices like DOC store the bad block info per floor. |
46 | * | |
47 | * Following assumptions are made: | |
48 | * - bbts start at a page boundary, if autolocated on a block boundary | |
cfa460ad | 49 | * - the space necessary for a bbt in FLASH does not exceed a block boundary |
ac7eb8a3 | 50 | * |
932394ac WD |
51 | */ |
52 | ||
53 | #include <common.h> | |
932394ac WD |
54 | #include <malloc.h> |
55 | #include <linux/mtd/compat.h> | |
56 | #include <linux/mtd/mtd.h> | |
57 | #include <linux/mtd/nand.h> | |
58 | ||
59 | #include <asm/errno.h> | |
60 | ||
ac7eb8a3 | 61 | /** |
932394ac WD |
62 | * check_pattern - [GENERIC] check if a pattern is in the buffer |
63 | * @buf: the buffer to search | |
64 | * @len: the length of buffer to search | |
65 | * @paglen: the pagelength | |
66 | * @td: search pattern descriptor | |
67 | * | |
68 | * Check for a pattern at the given place. Used to search bad block | |
69 | * tables and good / bad block identifiers. | |
70 | * If the SCAN_EMPTY option is set then check, if all bytes except the | |
71 | * pattern area contain 0xff | |
72 | * | |
73 | */ | |
cfa460ad | 74 | static int check_pattern(uint8_t *buf, int len, int paglen, struct nand_bbt_descr *td) |
932394ac | 75 | { |
cfa460ad | 76 | int i, end = 0; |
932394ac WD |
77 | uint8_t *p = buf; |
78 | ||
79 | end = paglen + td->offs; | |
80 | if (td->options & NAND_BBT_SCANEMPTY) { | |
81 | for (i = 0; i < end; i++) { | |
82 | if (p[i] != 0xff) | |
83 | return -1; | |
84 | } | |
ac7eb8a3 | 85 | } |
932394ac | 86 | p += end; |
ac7eb8a3 | 87 | |
932394ac WD |
88 | /* Compare the pattern */ |
89 | for (i = 0; i < td->len; i++) { | |
90 | if (p[i] != td->pattern[i]) | |
91 | return -1; | |
92 | } | |
93 | ||
932394ac | 94 | if (td->options & NAND_BBT_SCANEMPTY) { |
cfa460ad WJ |
95 | p += td->len; |
96 | end += td->len; | |
932394ac WD |
97 | for (i = end; i < len; i++) { |
98 | if (*p++ != 0xff) | |
99 | return -1; | |
100 | } | |
101 | } | |
102 | return 0; | |
103 | } | |
104 | ||
cfa460ad WJ |
105 | /** |
106 | * check_short_pattern - [GENERIC] check if a pattern is in the buffer | |
107 | * @buf: the buffer to search | |
108 | * @td: search pattern descriptor | |
109 | * | |
110 | * Check for a pattern at the given place. Used to search bad block | |
111 | * tables and good / bad block identifiers. Same as check_pattern, but | |
112 | * no optional empty check | |
113 | * | |
114 | */ | |
115 | static int check_short_pattern(uint8_t *buf, struct nand_bbt_descr *td) | |
116 | { | |
117 | int i; | |
118 | uint8_t *p = buf; | |
119 | ||
120 | /* Compare the pattern */ | |
121 | for (i = 0; i < td->len; i++) { | |
122 | if (p[td->offs + i] != td->pattern[i]) | |
123 | return -1; | |
124 | } | |
125 | return 0; | |
126 | } | |
127 | ||
932394ac WD |
128 | /** |
129 | * read_bbt - [GENERIC] Read the bad block table starting from page | |
130 | * @mtd: MTD device structure | |
131 | * @buf: temporary buffer | |
132 | * @page: the starting page | |
133 | * @num: the number of bbt descriptors to read | |
134 | * @bits: number of bits per block | |
135 | * @offs: offset in the memory table | |
136 | * @reserved_block_code: Pattern to identify reserved blocks | |
137 | * | |
138 | * Read the bad block table starting from page. | |
139 | * | |
140 | */ | |
cfa460ad WJ |
141 | static int read_bbt(struct mtd_info *mtd, uint8_t *buf, int page, int num, |
142 | int bits, int offs, int reserved_block_code) | |
932394ac WD |
143 | { |
144 | int res, i, j, act = 0; | |
145 | struct nand_chip *this = mtd->priv; | |
146 | size_t retlen, len, totlen; | |
147 | loff_t from; | |
148 | uint8_t msk = (uint8_t) ((1 << bits) - 1); | |
149 | ||
150 | totlen = (num * bits) >> 3; | |
cfa460ad | 151 | from = ((loff_t) page) << this->page_shift; |
ac7eb8a3 | 152 | |
932394ac | 153 | while (totlen) { |
cfa460ad WJ |
154 | len = min(totlen, (size_t) (1 << this->bbt_erase_shift)); |
155 | res = mtd->read(mtd, from, len, &retlen, buf); | |
932394ac WD |
156 | if (res < 0) { |
157 | if (retlen != len) { | |
cfa460ad | 158 | printk(KERN_INFO "nand_bbt: Error reading bad block table\n"); |
932394ac WD |
159 | return res; |
160 | } | |
cfa460ad | 161 | printk(KERN_WARNING "nand_bbt: ECC error while reading bad block table\n"); |
ac7eb8a3 | 162 | } |
932394ac WD |
163 | |
164 | /* Analyse data */ | |
165 | for (i = 0; i < len; i++) { | |
166 | uint8_t dat = buf[i]; | |
167 | for (j = 0; j < 8; j += bits, act += 2) { | |
168 | uint8_t tmp = (dat >> j) & msk; | |
169 | if (tmp == msk) | |
170 | continue; | |
cfa460ad | 171 | if (reserved_block_code && (tmp == reserved_block_code)) { |
aaa8eec5 SP |
172 | printk(KERN_DEBUG "nand_read_bbt: Reserved block at 0x%012llx\n", |
173 | (loff_t)((offs << 2) + | |
174 | (act >> 1)) << | |
175 | this->bbt_erase_shift); | |
932394ac | 176 | this->bbt[offs + (act >> 3)] |= 0x2 << (act & 0x06); |
cfa460ad | 177 | mtd->ecc_stats.bbtblocks++; |
932394ac WD |
178 | continue; |
179 | } | |
180 | /* Leave it for now, if its matured we can move this | |
181 | * message to MTD_DEBUG_LEVEL0 */ | |
aaa8eec5 SP |
182 | printk(KERN_DEBUG "nand_read_bbt: Bad block at 0x%012llx\n", |
183 | (loff_t)((offs << 2) + (act >> 1)) << | |
184 | this->bbt_erase_shift); | |
ac7eb8a3 | 185 | /* Factory marked bad or worn out ? */ |
932394ac WD |
186 | if (tmp == 0) |
187 | this->bbt[offs + (act >> 3)] |= 0x3 << (act & 0x06); | |
188 | else | |
189 | this->bbt[offs + (act >> 3)] |= 0x1 << (act & 0x06); | |
cfa460ad | 190 | mtd->ecc_stats.badblocks++; |
ac7eb8a3 | 191 | } |
932394ac WD |
192 | } |
193 | totlen -= len; | |
194 | from += len; | |
195 | } | |
196 | return 0; | |
197 | } | |
198 | ||
199 | /** | |
200 | * read_abs_bbt - [GENERIC] Read the bad block table starting at a given page | |
201 | * @mtd: MTD device structure | |
202 | * @buf: temporary buffer | |
ac7eb8a3 | 203 | * @td: descriptor for the bad block table |
932394ac WD |
204 | * @chip: read the table for a specific chip, -1 read all chips. |
205 | * Applies only if NAND_BBT_PERCHIP option is set | |
206 | * | |
207 | * Read the bad block table for all chips starting at a given page | |
208 | * We assume that the bbt bits are in consecutive order. | |
209 | */ | |
cfa460ad | 210 | static int read_abs_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td, int chip) |
932394ac WD |
211 | { |
212 | struct nand_chip *this = mtd->priv; | |
213 | int res = 0, i; | |
214 | int bits; | |
215 | ||
216 | bits = td->options & NAND_BBT_NRBITS_MSK; | |
217 | if (td->options & NAND_BBT_PERCHIP) { | |
218 | int offs = 0; | |
219 | for (i = 0; i < this->numchips; i++) { | |
220 | if (chip == -1 || chip == i) | |
221 | res = read_bbt (mtd, buf, td->pages[i], this->chipsize >> this->bbt_erase_shift, bits, offs, td->reserved_block_code); | |
222 | if (res) | |
223 | return res; | |
224 | offs += this->chipsize >> (this->bbt_erase_shift + 2); | |
225 | } | |
226 | } else { | |
227 | res = read_bbt (mtd, buf, td->pages[0], mtd->size >> this->bbt_erase_shift, bits, 0, td->reserved_block_code); | |
228 | if (res) | |
229 | return res; | |
230 | } | |
231 | return 0; | |
232 | } | |
233 | ||
cfa460ad WJ |
234 | /* |
235 | * Scan read raw data from flash | |
236 | */ | |
237 | static int scan_read_raw(struct mtd_info *mtd, uint8_t *buf, loff_t offs, | |
238 | size_t len) | |
239 | { | |
240 | struct mtd_oob_ops ops; | |
241 | ||
242 | ops.mode = MTD_OOB_RAW; | |
243 | ops.ooboffs = 0; | |
244 | ops.ooblen = mtd->oobsize; | |
245 | ops.oobbuf = buf; | |
246 | ops.datbuf = buf; | |
247 | ops.len = len; | |
248 | ||
249 | return mtd->read_oob(mtd, offs, &ops); | |
250 | } | |
251 | ||
252 | /* | |
253 | * Scan write data with oob to flash | |
254 | */ | |
255 | static int scan_write_bbt(struct mtd_info *mtd, loff_t offs, size_t len, | |
256 | uint8_t *buf, uint8_t *oob) | |
257 | { | |
258 | struct mtd_oob_ops ops; | |
259 | ||
260 | ops.mode = MTD_OOB_PLACE; | |
261 | ops.ooboffs = 0; | |
262 | ops.ooblen = mtd->oobsize; | |
263 | ops.datbuf = buf; | |
264 | ops.oobbuf = oob; | |
265 | ops.len = len; | |
266 | ||
267 | return mtd->write_oob(mtd, offs, &ops); | |
268 | } | |
269 | ||
932394ac WD |
270 | /** |
271 | * read_abs_bbts - [GENERIC] Read the bad block table(s) for all chips starting at a given page | |
272 | * @mtd: MTD device structure | |
273 | * @buf: temporary buffer | |
ac7eb8a3 | 274 | * @td: descriptor for the bad block table |
932394ac WD |
275 | * @md: descriptor for the bad block table mirror |
276 | * | |
277 | * Read the bad block table(s) for all chips starting at a given page | |
278 | * We assume that the bbt bits are in consecutive order. | |
279 | * | |
280 | */ | |
cfa460ad WJ |
281 | static int read_abs_bbts(struct mtd_info *mtd, uint8_t *buf, |
282 | struct nand_bbt_descr *td, struct nand_bbt_descr *md) | |
932394ac WD |
283 | { |
284 | struct nand_chip *this = mtd->priv; | |
285 | ||
ac7eb8a3 | 286 | /* Read the primary version, if available */ |
932394ac | 287 | if (td->options & NAND_BBT_VERSION) { |
aaa8eec5 SP |
288 | scan_read_raw(mtd, buf, (loff_t)td->pages[0] << |
289 | this->page_shift, mtd->writesize); | |
cfa460ad WJ |
290 | td->version[0] = buf[mtd->writesize + td->veroffs]; |
291 | printk(KERN_DEBUG "Bad block table at page %d, version 0x%02X\n", | |
292 | td->pages[0], td->version[0]); | |
932394ac WD |
293 | } |
294 | ||
ac7eb8a3 | 295 | /* Read the mirror version, if available */ |
932394ac | 296 | if (md && (md->options & NAND_BBT_VERSION)) { |
aaa8eec5 SP |
297 | scan_read_raw(mtd, buf, (loff_t)md->pages[0] << |
298 | this->page_shift, mtd->writesize); | |
cfa460ad WJ |
299 | md->version[0] = buf[mtd->writesize + md->veroffs]; |
300 | printk(KERN_DEBUG "Bad block table at page %d, version 0x%02X\n", | |
301 | md->pages[0], md->version[0]); | |
932394ac | 302 | } |
932394ac WD |
303 | return 1; |
304 | } | |
305 | ||
cfa460ad WJ |
306 | /* |
307 | * Scan a given block full | |
308 | */ | |
309 | static int scan_block_full(struct mtd_info *mtd, struct nand_bbt_descr *bd, | |
310 | loff_t offs, uint8_t *buf, size_t readlen, | |
311 | int scanlen, int len) | |
312 | { | |
313 | int ret, j; | |
314 | ||
315 | ret = scan_read_raw(mtd, buf, offs, readlen); | |
316 | if (ret) | |
317 | return ret; | |
318 | ||
319 | for (j = 0; j < len; j++, buf += scanlen) { | |
320 | if (check_pattern(buf, scanlen, mtd->writesize, bd)) | |
321 | return 1; | |
322 | } | |
323 | return 0; | |
324 | } | |
325 | ||
326 | /* | |
327 | * Scan a given block partially | |
328 | */ | |
329 | static int scan_block_fast(struct mtd_info *mtd, struct nand_bbt_descr *bd, | |
330 | loff_t offs, uint8_t *buf, int len) | |
331 | { | |
332 | struct mtd_oob_ops ops; | |
333 | int j, ret; | |
334 | ||
335 | ops.ooblen = mtd->oobsize; | |
336 | ops.oobbuf = buf; | |
337 | ops.ooboffs = 0; | |
338 | ops.datbuf = NULL; | |
339 | ops.mode = MTD_OOB_PLACE; | |
340 | ||
341 | for (j = 0; j < len; j++) { | |
342 | /* | |
343 | * Read the full oob until read_oob is fixed to | |
344 | * handle single byte reads for 16 bit | |
345 | * buswidth | |
346 | */ | |
347 | ret = mtd->read_oob(mtd, offs, &ops); | |
348 | if (ret) | |
349 | return ret; | |
350 | ||
351 | if (check_short_pattern(buf, bd)) | |
352 | return 1; | |
353 | ||
354 | offs += mtd->writesize; | |
355 | } | |
356 | return 0; | |
357 | } | |
358 | ||
932394ac WD |
359 | /** |
360 | * create_bbt - [GENERIC] Create a bad block table by scanning the device | |
361 | * @mtd: MTD device structure | |
362 | * @buf: temporary buffer | |
363 | * @bd: descriptor for the good/bad block search pattern | |
364 | * @chip: create the table for a specific chip, -1 read all chips. | |
365 | * Applies only if NAND_BBT_PERCHIP option is set | |
366 | * | |
367 | * Create a bad block table by scanning the device | |
368 | * for the given good/bad block identify pattern | |
369 | */ | |
cfa460ad WJ |
370 | static int create_bbt(struct mtd_info *mtd, uint8_t *buf, |
371 | struct nand_bbt_descr *bd, int chip) | |
932394ac WD |
372 | { |
373 | struct nand_chip *this = mtd->priv; | |
cfa460ad | 374 | int i, numblocks, len, scanlen; |
932394ac WD |
375 | int startblock; |
376 | loff_t from; | |
cfa460ad WJ |
377 | size_t readlen; |
378 | ||
e52b34d4 | 379 | MTDDEBUG (MTD_DEBUG_LEVEL0, "Scanning device for bad blocks\n"); |
932394ac | 380 | |
932394ac WD |
381 | if (bd->options & NAND_BBT_SCANALLPAGES) |
382 | len = 1 << (this->bbt_erase_shift - this->page_shift); | |
383 | else { | |
384 | if (bd->options & NAND_BBT_SCAN2NDPAGE) | |
385 | len = 2; | |
ac7eb8a3 | 386 | else |
932394ac WD |
387 | len = 1; |
388 | } | |
cfa460ad WJ |
389 | |
390 | if (!(bd->options & NAND_BBT_SCANEMPTY)) { | |
391 | /* We need only read few bytes from the OOB area */ | |
392 | scanlen = 0; | |
393 | readlen = bd->len; | |
394 | } else { | |
395 | /* Full page content should be read */ | |
396 | scanlen = mtd->writesize + mtd->oobsize; | |
397 | readlen = len * mtd->writesize; | |
398 | } | |
932394ac WD |
399 | |
400 | if (chip == -1) { | |
cfa460ad WJ |
401 | /* Note that numblocks is 2 * (real numblocks) here, see i+=2 |
402 | * below as it makes shifting and masking less painful */ | |
932394ac WD |
403 | numblocks = mtd->size >> (this->bbt_erase_shift - 1); |
404 | startblock = 0; | |
405 | from = 0; | |
406 | } else { | |
407 | if (chip >= this->numchips) { | |
cfa460ad WJ |
408 | printk(KERN_WARNING "create_bbt(): chipnr (%d) > available chips (%d)\n", |
409 | chip + 1, this->numchips); | |
410 | return -EINVAL; | |
932394ac WD |
411 | } |
412 | numblocks = this->chipsize >> (this->bbt_erase_shift - 1); | |
413 | startblock = chip * numblocks; | |
414 | numblocks += startblock; | |
aaa8eec5 | 415 | from = (loff_t)startblock << (this->bbt_erase_shift - 1); |
932394ac | 416 | } |
ac7eb8a3 | 417 | |
932394ac | 418 | for (i = startblock; i < numblocks;) { |
cfa460ad WJ |
419 | int ret; |
420 | ||
421 | if (bd->options & NAND_BBT_SCANALLPAGES) | |
422 | ret = scan_block_full(mtd, bd, from, buf, readlen, | |
423 | scanlen, len); | |
424 | else | |
425 | ret = scan_block_fast(mtd, bd, from, buf, len); | |
426 | ||
427 | if (ret < 0) | |
428 | return ret; | |
429 | ||
430 | if (ret) { | |
431 | this->bbt[i >> 3] |= 0x03 << (i & 0x6); | |
e52b34d4 | 432 | MTDDEBUG (MTD_DEBUG_LEVEL0, |
aaa8eec5 SP |
433 | "Bad eraseblock %d at 0x%012llx\n", |
434 | i >> 1, (unsigned long long)from); | |
cfa460ad | 435 | mtd->ecc_stats.badblocks++; |
932394ac | 436 | } |
cfa460ad | 437 | |
932394ac WD |
438 | i += 2; |
439 | from += (1 << this->bbt_erase_shift); | |
440 | } | |
cfa460ad | 441 | return 0; |
932394ac WD |
442 | } |
443 | ||
444 | /** | |
445 | * search_bbt - [GENERIC] scan the device for a specific bad block table | |
446 | * @mtd: MTD device structure | |
447 | * @buf: temporary buffer | |
448 | * @td: descriptor for the bad block table | |
449 | * | |
450 | * Read the bad block table by searching for a given ident pattern. | |
ac7eb8a3 | 451 | * Search is preformed either from the beginning up or from the end of |
932394ac WD |
452 | * the device downwards. The search starts always at the start of a |
453 | * block. | |
ac7eb8a3 | 454 | * If the option NAND_BBT_PERCHIP is given, each chip is searched |
932394ac | 455 | * for a bbt, which contains the bad block information of this chip. |
cfa460ad | 456 | * This is necessary to provide support for certain DOC devices. |
932394ac | 457 | * |
ac7eb8a3 WD |
458 | * The bbt ident pattern resides in the oob area of the first page |
459 | * in a block. | |
932394ac | 460 | */ |
cfa460ad | 461 | static int search_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td) |
932394ac WD |
462 | { |
463 | struct nand_chip *this = mtd->priv; | |
464 | int i, chips; | |
465 | int bits, startblock, block, dir; | |
cfa460ad | 466 | int scanlen = mtd->writesize + mtd->oobsize; |
932394ac | 467 | int bbtblocks; |
cfa460ad | 468 | int blocktopage = this->bbt_erase_shift - this->page_shift; |
932394ac WD |
469 | |
470 | /* Search direction top -> down ? */ | |
471 | if (td->options & NAND_BBT_LASTBLOCK) { | |
cfa460ad | 472 | startblock = (mtd->size >> this->bbt_erase_shift) - 1; |
932394ac WD |
473 | dir = -1; |
474 | } else { | |
ac7eb8a3 | 475 | startblock = 0; |
932394ac | 476 | dir = 1; |
ac7eb8a3 WD |
477 | } |
478 | ||
932394ac WD |
479 | /* Do we have a bbt per chip ? */ |
480 | if (td->options & NAND_BBT_PERCHIP) { | |
481 | chips = this->numchips; | |
482 | bbtblocks = this->chipsize >> this->bbt_erase_shift; | |
483 | startblock &= bbtblocks - 1; | |
484 | } else { | |
485 | chips = 1; | |
486 | bbtblocks = mtd->size >> this->bbt_erase_shift; | |
487 | } | |
ac7eb8a3 | 488 | |
932394ac WD |
489 | /* Number of bits for each erase block in the bbt */ |
490 | bits = td->options & NAND_BBT_NRBITS_MSK; | |
ac7eb8a3 | 491 | |
932394ac WD |
492 | for (i = 0; i < chips; i++) { |
493 | /* Reset version information */ | |
ac7eb8a3 | 494 | td->version[i] = 0; |
932394ac WD |
495 | td->pages[i] = -1; |
496 | /* Scan the maximum number of blocks */ | |
497 | for (block = 0; block < td->maxblocks; block++) { | |
cfa460ad | 498 | |
932394ac | 499 | int actblock = startblock + dir * block; |
aaa8eec5 | 500 | loff_t offs = (loff_t)actblock << this->bbt_erase_shift; |
cfa460ad | 501 | |
932394ac | 502 | /* Read first page */ |
cfa460ad WJ |
503 | scan_read_raw(mtd, buf, offs, mtd->writesize); |
504 | if (!check_pattern(buf, scanlen, mtd->writesize, td)) { | |
505 | td->pages[i] = actblock << blocktopage; | |
932394ac | 506 | if (td->options & NAND_BBT_VERSION) { |
cfa460ad | 507 | td->version[i] = buf[mtd->writesize + td->veroffs]; |
932394ac WD |
508 | } |
509 | break; | |
510 | } | |
511 | } | |
512 | startblock += this->chipsize >> this->bbt_erase_shift; | |
513 | } | |
514 | /* Check, if we found a bbt for each requested chip */ | |
515 | for (i = 0; i < chips; i++) { | |
516 | if (td->pages[i] == -1) | |
cfa460ad | 517 | printk(KERN_WARNING "Bad block table not found for chip %d\n", i); |
932394ac | 518 | else |
cfa460ad WJ |
519 | printk(KERN_DEBUG "Bad block table found at page %d, version 0x%02X\n", td->pages[i], |
520 | td->version[i]); | |
932394ac | 521 | } |
ac7eb8a3 | 522 | return 0; |
932394ac WD |
523 | } |
524 | ||
525 | /** | |
526 | * search_read_bbts - [GENERIC] scan the device for bad block table(s) | |
527 | * @mtd: MTD device structure | |
528 | * @buf: temporary buffer | |
ac7eb8a3 | 529 | * @td: descriptor for the bad block table |
932394ac WD |
530 | * @md: descriptor for the bad block table mirror |
531 | * | |
532 | * Search and read the bad block table(s) | |
533 | */ | |
cfa460ad | 534 | static int search_read_bbts(struct mtd_info *mtd, uint8_t * buf, struct nand_bbt_descr *td, struct nand_bbt_descr *md) |
932394ac WD |
535 | { |
536 | /* Search the primary table */ | |
cfa460ad | 537 | search_bbt(mtd, buf, td); |
ac7eb8a3 | 538 | |
932394ac WD |
539 | /* Search the mirror table */ |
540 | if (md) | |
cfa460ad | 541 | search_bbt(mtd, buf, md); |
ac7eb8a3 | 542 | |
932394ac | 543 | /* Force result check */ |
ac7eb8a3 | 544 | return 1; |
932394ac | 545 | } |
932394ac | 546 | |
ac7eb8a3 | 547 | /** |
932394ac WD |
548 | * write_bbt - [GENERIC] (Re)write the bad block table |
549 | * | |
550 | * @mtd: MTD device structure | |
551 | * @buf: temporary buffer | |
ac7eb8a3 | 552 | * @td: descriptor for the bad block table |
932394ac WD |
553 | * @md: descriptor for the bad block table mirror |
554 | * @chipsel: selector for a specific chip, -1 for all | |
555 | * | |
556 | * (Re)write the bad block table | |
557 | * | |
558 | */ | |
cfa460ad WJ |
559 | static int write_bbt(struct mtd_info *mtd, uint8_t *buf, |
560 | struct nand_bbt_descr *td, struct nand_bbt_descr *md, | |
561 | int chipsel) | |
932394ac WD |
562 | { |
563 | struct nand_chip *this = mtd->priv; | |
932394ac WD |
564 | struct erase_info einfo; |
565 | int i, j, res, chip = 0; | |
566 | int bits, startblock, dir, page, offs, numblocks, sft, sftmsk; | |
cfa460ad | 567 | int nrchips, bbtoffs, pageoffs, ooboffs; |
932394ac WD |
568 | uint8_t msk[4]; |
569 | uint8_t rcode = td->reserved_block_code; | |
570 | size_t retlen, len = 0; | |
571 | loff_t to; | |
cfa460ad WJ |
572 | struct mtd_oob_ops ops; |
573 | ||
574 | ops.ooblen = mtd->oobsize; | |
575 | ops.ooboffs = 0; | |
576 | ops.datbuf = NULL; | |
577 | ops.mode = MTD_OOB_PLACE; | |
932394ac WD |
578 | |
579 | if (!rcode) | |
580 | rcode = 0xff; | |
581 | /* Write bad block table per chip rather than per device ? */ | |
582 | if (td->options & NAND_BBT_PERCHIP) { | |
cfa460ad | 583 | numblocks = (int)(this->chipsize >> this->bbt_erase_shift); |
ac7eb8a3 | 584 | /* Full device write or specific chip ? */ |
932394ac WD |
585 | if (chipsel == -1) { |
586 | nrchips = this->numchips; | |
587 | } else { | |
588 | nrchips = chipsel + 1; | |
589 | chip = chipsel; | |
590 | } | |
591 | } else { | |
cfa460ad | 592 | numblocks = (int)(mtd->size >> this->bbt_erase_shift); |
932394ac | 593 | nrchips = 1; |
ac7eb8a3 WD |
594 | } |
595 | ||
932394ac WD |
596 | /* Loop through the chips */ |
597 | for (; chip < nrchips; chip++) { | |
ac7eb8a3 WD |
598 | |
599 | /* There was already a version of the table, reuse the page | |
600 | * This applies for absolute placement too, as we have the | |
932394ac WD |
601 | * page nr. in td->pages. |
602 | */ | |
603 | if (td->pages[chip] != -1) { | |
604 | page = td->pages[chip]; | |
605 | goto write; | |
ac7eb8a3 | 606 | } |
932394ac WD |
607 | |
608 | /* Automatic placement of the bad block table */ | |
609 | /* Search direction top -> down ? */ | |
610 | if (td->options & NAND_BBT_LASTBLOCK) { | |
611 | startblock = numblocks * (chip + 1) - 1; | |
612 | dir = -1; | |
613 | } else { | |
614 | startblock = chip * numblocks; | |
615 | dir = 1; | |
ac7eb8a3 | 616 | } |
932394ac WD |
617 | |
618 | for (i = 0; i < td->maxblocks; i++) { | |
619 | int block = startblock + dir * i; | |
620 | /* Check, if the block is bad */ | |
cfa460ad WJ |
621 | switch ((this->bbt[block >> 2] >> |
622 | (2 * (block & 0x03))) & 0x03) { | |
932394ac WD |
623 | case 0x01: |
624 | case 0x03: | |
625 | continue; | |
626 | } | |
cfa460ad WJ |
627 | page = block << |
628 | (this->bbt_erase_shift - this->page_shift); | |
932394ac WD |
629 | /* Check, if the block is used by the mirror table */ |
630 | if (!md || md->pages[chip] != page) | |
631 | goto write; | |
632 | } | |
cfa460ad | 633 | printk(KERN_ERR "No space left to write bad block table\n"); |
932394ac | 634 | return -ENOSPC; |
cfa460ad | 635 | write: |
932394ac WD |
636 | |
637 | /* Set up shift count and masks for the flash table */ | |
638 | bits = td->options & NAND_BBT_NRBITS_MSK; | |
cfa460ad | 639 | msk[2] = ~rcode; |
932394ac | 640 | switch (bits) { |
cfa460ad WJ |
641 | case 1: sft = 3; sftmsk = 0x07; msk[0] = 0x00; msk[1] = 0x01; |
642 | msk[3] = 0x01; | |
643 | break; | |
644 | case 2: sft = 2; sftmsk = 0x06; msk[0] = 0x00; msk[1] = 0x01; | |
645 | msk[3] = 0x03; | |
646 | break; | |
647 | case 4: sft = 1; sftmsk = 0x04; msk[0] = 0x00; msk[1] = 0x0C; | |
648 | msk[3] = 0x0f; | |
649 | break; | |
650 | case 8: sft = 0; sftmsk = 0x00; msk[0] = 0x00; msk[1] = 0x0F; | |
651 | msk[3] = 0xff; | |
652 | break; | |
932394ac WD |
653 | default: return -EINVAL; |
654 | } | |
ac7eb8a3 | 655 | |
932394ac | 656 | bbtoffs = chip * (numblocks >> 2); |
ac7eb8a3 | 657 | |
932394ac WD |
658 | to = ((loff_t) page) << this->page_shift; |
659 | ||
932394ac WD |
660 | /* Must we save the block contents ? */ |
661 | if (td->options & NAND_BBT_SAVECONTENT) { | |
662 | /* Make it block aligned */ | |
663 | to &= ~((loff_t) ((1 << this->bbt_erase_shift) - 1)); | |
664 | len = 1 << this->bbt_erase_shift; | |
cfa460ad | 665 | res = mtd->read(mtd, to, len, &retlen, buf); |
932394ac WD |
666 | if (res < 0) { |
667 | if (retlen != len) { | |
cfa460ad WJ |
668 | printk(KERN_INFO "nand_bbt: Error " |
669 | "reading block for writing " | |
670 | "the bad block table\n"); | |
932394ac WD |
671 | return res; |
672 | } | |
cfa460ad WJ |
673 | printk(KERN_WARNING "nand_bbt: ECC error " |
674 | "while reading block for writing " | |
675 | "bad block table\n"); | |
932394ac | 676 | } |
cfa460ad WJ |
677 | /* Read oob data */ |
678 | ops.ooblen = (len >> this->page_shift) * mtd->oobsize; | |
679 | ops.oobbuf = &buf[len]; | |
680 | res = mtd->read_oob(mtd, to + mtd->writesize, &ops); | |
681 | if (res < 0 || ops.oobretlen != ops.ooblen) | |
682 | goto outerr; | |
683 | ||
932394ac WD |
684 | /* Calc the byte offset in the buffer */ |
685 | pageoffs = page - (int)(to >> this->page_shift); | |
686 | offs = pageoffs << this->page_shift; | |
687 | /* Preset the bbt area with 0xff */ | |
cfa460ad WJ |
688 | memset(&buf[offs], 0xff, (size_t) (numblocks >> sft)); |
689 | ooboffs = len + (pageoffs * mtd->oobsize); | |
690 | ||
932394ac WD |
691 | } else { |
692 | /* Calc length */ | |
693 | len = (size_t) (numblocks >> sft); | |
694 | /* Make it page aligned ! */ | |
cfa460ad WJ |
695 | len = (len + (mtd->writesize - 1)) & |
696 | ~(mtd->writesize - 1); | |
932394ac | 697 | /* Preset the buffer with 0xff */ |
cfa460ad WJ |
698 | memset(buf, 0xff, len + |
699 | (len >> this->page_shift)* mtd->oobsize); | |
932394ac | 700 | offs = 0; |
cfa460ad | 701 | ooboffs = len; |
932394ac | 702 | /* Pattern is located in oob area of first page */ |
cfa460ad | 703 | memcpy(&buf[ooboffs + td->offs], td->pattern, td->len); |
932394ac | 704 | } |
ac7eb8a3 | 705 | |
cfa460ad WJ |
706 | if (td->options & NAND_BBT_VERSION) |
707 | buf[ooboffs + td->veroffs] = td->version[chip]; | |
708 | ||
932394ac | 709 | /* walk through the memory table */ |
cfa460ad | 710 | for (i = 0; i < numblocks;) { |
932394ac WD |
711 | uint8_t dat; |
712 | dat = this->bbt[bbtoffs + (i >> 2)]; | |
cfa460ad | 713 | for (j = 0; j < 4; j++, i++) { |
932394ac WD |
714 | int sftcnt = (i << (3 - sft)) & sftmsk; |
715 | /* Do not store the reserved bbt blocks ! */ | |
cfa460ad WJ |
716 | buf[offs + (i >> sft)] &= |
717 | ~(msk[dat & 0x03] << sftcnt); | |
932394ac WD |
718 | dat >>= 2; |
719 | } | |
720 | } | |
ac7eb8a3 | 721 | |
cfa460ad | 722 | memset(&einfo, 0, sizeof(einfo)); |
932394ac | 723 | einfo.mtd = mtd; |
aaa8eec5 | 724 | einfo.addr = to; |
932394ac | 725 | einfo.len = 1 << this->bbt_erase_shift; |
cfa460ad WJ |
726 | res = nand_erase_nand(mtd, &einfo, 1); |
727 | if (res < 0) | |
728 | goto outerr; | |
ac7eb8a3 | 729 | |
cfa460ad WJ |
730 | res = scan_write_bbt(mtd, to, len, buf, &buf[len]); |
731 | if (res < 0) | |
732 | goto outerr; | |
733 | ||
aaa8eec5 SP |
734 | printk(KERN_DEBUG "Bad block table written to 0x%012llx, " |
735 | "version 0x%02X\n", (unsigned long long)to, | |
736 | td->version[chip]); | |
ac7eb8a3 | 737 | |
932394ac WD |
738 | /* Mark it as used */ |
739 | td->pages[chip] = page; | |
ac7eb8a3 | 740 | } |
932394ac | 741 | return 0; |
cfa460ad WJ |
742 | |
743 | outerr: | |
744 | printk(KERN_WARNING | |
745 | "nand_bbt: Error while writing bad block table %d\n", res); | |
746 | return res; | |
932394ac WD |
747 | } |
748 | ||
749 | /** | |
750 | * nand_memory_bbt - [GENERIC] create a memory based bad block table | |
751 | * @mtd: MTD device structure | |
752 | * @bd: descriptor for the good/bad block search pattern | |
753 | * | |
ac7eb8a3 | 754 | * The function creates a memory based bbt by scanning the device |
932394ac WD |
755 | * for manufacturer / software marked good / bad blocks |
756 | */ | |
cfa460ad | 757 | static inline int nand_memory_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd) |
932394ac WD |
758 | { |
759 | struct nand_chip *this = mtd->priv; | |
760 | ||
cfa460ad WJ |
761 | bd->options &= ~NAND_BBT_SCANEMPTY; |
762 | return create_bbt(mtd, this->buffers->databuf, bd, -1); | |
932394ac WD |
763 | } |
764 | ||
765 | /** | |
cfa460ad | 766 | * check_create - [GENERIC] create and write bbt(s) if necessary |
932394ac WD |
767 | * @mtd: MTD device structure |
768 | * @buf: temporary buffer | |
769 | * @bd: descriptor for the good/bad block search pattern | |
770 | * | |
771 | * The function checks the results of the previous call to read_bbt | |
cfa460ad WJ |
772 | * and creates / updates the bbt(s) if necessary |
773 | * Creation is necessary if no bbt was found for the chip/device | |
774 | * Update is necessary if one of the tables is missing or the | |
932394ac WD |
775 | * version nr. of one table is less than the other |
776 | */ | |
cfa460ad | 777 | static int check_create(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *bd) |
932394ac WD |
778 | { |
779 | int i, chips, writeops, chipsel, res; | |
780 | struct nand_chip *this = mtd->priv; | |
781 | struct nand_bbt_descr *td = this->bbt_td; | |
782 | struct nand_bbt_descr *md = this->bbt_md; | |
783 | struct nand_bbt_descr *rd, *rd2; | |
784 | ||
785 | /* Do we have a bbt per chip ? */ | |
ac7eb8a3 | 786 | if (td->options & NAND_BBT_PERCHIP) |
932394ac | 787 | chips = this->numchips; |
ac7eb8a3 | 788 | else |
932394ac | 789 | chips = 1; |
ac7eb8a3 | 790 | |
932394ac WD |
791 | for (i = 0; i < chips; i++) { |
792 | writeops = 0; | |
793 | rd = NULL; | |
794 | rd2 = NULL; | |
795 | /* Per chip or per device ? */ | |
796 | chipsel = (td->options & NAND_BBT_PERCHIP) ? i : -1; | |
797 | /* Mirrored table avilable ? */ | |
798 | if (md) { | |
799 | if (td->pages[i] == -1 && md->pages[i] == -1) { | |
800 | writeops = 0x03; | |
801 | goto create; | |
802 | } | |
803 | ||
804 | if (td->pages[i] == -1) { | |
ac7eb8a3 | 805 | rd = md; |
932394ac WD |
806 | td->version[i] = md->version[i]; |
807 | writeops = 1; | |
808 | goto writecheck; | |
809 | } | |
810 | ||
811 | if (md->pages[i] == -1) { | |
812 | rd = td; | |
813 | md->version[i] = td->version[i]; | |
814 | writeops = 2; | |
815 | goto writecheck; | |
816 | } | |
817 | ||
818 | if (td->version[i] == md->version[i]) { | |
819 | rd = td; | |
820 | if (!(td->options & NAND_BBT_VERSION)) | |
821 | rd2 = md; | |
822 | goto writecheck; | |
ac7eb8a3 | 823 | } |
932394ac WD |
824 | |
825 | if (((int8_t) (td->version[i] - md->version[i])) > 0) { | |
826 | rd = td; | |
827 | md->version[i] = td->version[i]; | |
828 | writeops = 2; | |
829 | } else { | |
830 | rd = md; | |
831 | td->version[i] = md->version[i]; | |
832 | writeops = 1; | |
833 | } | |
834 | ||
835 | goto writecheck; | |
836 | ||
837 | } else { | |
838 | if (td->pages[i] == -1) { | |
839 | writeops = 0x01; | |
840 | goto create; | |
841 | } | |
842 | rd = td; | |
843 | goto writecheck; | |
844 | } | |
cfa460ad | 845 | create: |
932394ac WD |
846 | /* Create the bad block table by scanning the device ? */ |
847 | if (!(td->options & NAND_BBT_CREATE)) | |
ac7eb8a3 WD |
848 | continue; |
849 | ||
932394ac | 850 | /* Create the table in memory by scanning the chip(s) */ |
cfa460ad | 851 | create_bbt(mtd, buf, bd, chipsel); |
ac7eb8a3 | 852 | |
932394ac WD |
853 | td->version[i] = 1; |
854 | if (md) | |
ac7eb8a3 | 855 | md->version[i] = 1; |
cfa460ad | 856 | writecheck: |
932394ac WD |
857 | /* read back first ? */ |
858 | if (rd) | |
cfa460ad | 859 | read_abs_bbt(mtd, buf, rd, chipsel); |
932394ac WD |
860 | /* If they weren't versioned, read both. */ |
861 | if (rd2) | |
cfa460ad | 862 | read_abs_bbt(mtd, buf, rd2, chipsel); |
932394ac WD |
863 | |
864 | /* Write the bad block table to the device ? */ | |
865 | if ((writeops & 0x01) && (td->options & NAND_BBT_WRITE)) { | |
cfa460ad | 866 | res = write_bbt(mtd, buf, td, md, chipsel); |
932394ac WD |
867 | if (res < 0) |
868 | return res; | |
869 | } | |
ac7eb8a3 | 870 | |
932394ac WD |
871 | /* Write the mirror bad block table to the device ? */ |
872 | if ((writeops & 0x02) && md && (md->options & NAND_BBT_WRITE)) { | |
cfa460ad | 873 | res = write_bbt(mtd, buf, md, td, chipsel); |
932394ac WD |
874 | if (res < 0) |
875 | return res; | |
876 | } | |
877 | } | |
ac7eb8a3 | 878 | return 0; |
932394ac WD |
879 | } |
880 | ||
881 | /** | |
ac7eb8a3 | 882 | * mark_bbt_regions - [GENERIC] mark the bad block table regions |
932394ac WD |
883 | * @mtd: MTD device structure |
884 | * @td: bad block table descriptor | |
885 | * | |
886 | * The bad block table regions are marked as "bad" to prevent | |
887 | * accidental erasures / writes. The regions are identified by | |
888 | * the mark 0x02. | |
889 | */ | |
cfa460ad | 890 | static void mark_bbt_region(struct mtd_info *mtd, struct nand_bbt_descr *td) |
932394ac WD |
891 | { |
892 | struct nand_chip *this = mtd->priv; | |
893 | int i, j, chips, block, nrblocks, update; | |
894 | uint8_t oldval, newval; | |
895 | ||
896 | /* Do we have a bbt per chip ? */ | |
897 | if (td->options & NAND_BBT_PERCHIP) { | |
898 | chips = this->numchips; | |
899 | nrblocks = (int)(this->chipsize >> this->bbt_erase_shift); | |
900 | } else { | |
901 | chips = 1; | |
902 | nrblocks = (int)(mtd->size >> this->bbt_erase_shift); | |
ac7eb8a3 WD |
903 | } |
904 | ||
932394ac WD |
905 | for (i = 0; i < chips; i++) { |
906 | if ((td->options & NAND_BBT_ABSPAGE) || | |
907 | !(td->options & NAND_BBT_WRITE)) { | |
cfa460ad WJ |
908 | if (td->pages[i] == -1) |
909 | continue; | |
932394ac | 910 | block = td->pages[i] >> (this->bbt_erase_shift - this->page_shift); |
ac7eb8a3 | 911 | block <<= 1; |
932394ac WD |
912 | oldval = this->bbt[(block >> 3)]; |
913 | newval = oldval | (0x2 << (block & 0x06)); | |
914 | this->bbt[(block >> 3)] = newval; | |
915 | if ((oldval != newval) && td->reserved_block_code) | |
aaa8eec5 SP |
916 | nand_update_bbt(mtd, (loff_t)block << |
917 | (this->bbt_erase_shift - 1)); | |
932394ac WD |
918 | continue; |
919 | } | |
920 | update = 0; | |
921 | if (td->options & NAND_BBT_LASTBLOCK) | |
922 | block = ((i + 1) * nrblocks) - td->maxblocks; | |
ac7eb8a3 | 923 | else |
932394ac | 924 | block = i * nrblocks; |
ac7eb8a3 | 925 | block <<= 1; |
932394ac WD |
926 | for (j = 0; j < td->maxblocks; j++) { |
927 | oldval = this->bbt[(block >> 3)]; | |
928 | newval = oldval | (0x2 << (block & 0x06)); | |
929 | this->bbt[(block >> 3)] = newval; | |
cfa460ad WJ |
930 | if (oldval != newval) |
931 | update = 1; | |
932394ac | 932 | block += 2; |
ac7eb8a3 | 933 | } |
932394ac WD |
934 | /* If we want reserved blocks to be recorded to flash, and some |
935 | new ones have been marked, then we need to update the stored | |
936 | bbts. This should only happen once. */ | |
937 | if (update && td->reserved_block_code) | |
aaa8eec5 SP |
938 | nand_update_bbt(mtd, (loff_t)(block - 2) << |
939 | (this->bbt_erase_shift - 1)); | |
932394ac WD |
940 | } |
941 | } | |
942 | ||
943 | /** | |
944 | * nand_scan_bbt - [NAND Interface] scan, find, read and maybe create bad block table(s) | |
945 | * @mtd: MTD device structure | |
946 | * @bd: descriptor for the good/bad block search pattern | |
947 | * | |
ac7eb8a3 | 948 | * The function checks, if a bad block table(s) is/are already |
932394ac WD |
949 | * available. If not it scans the device for manufacturer |
950 | * marked good / bad blocks and writes the bad block table(s) to | |
951 | * the selected place. | |
952 | * | |
953 | * The bad block table memory is allocated here. It must be freed | |
954 | * by calling the nand_free_bbt function. | |
955 | * | |
956 | */ | |
cfa460ad | 957 | int nand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd) |
932394ac WD |
958 | { |
959 | struct nand_chip *this = mtd->priv; | |
960 | int len, res = 0; | |
961 | uint8_t *buf; | |
962 | struct nand_bbt_descr *td = this->bbt_td; | |
963 | struct nand_bbt_descr *md = this->bbt_md; | |
964 | ||
965 | len = mtd->size >> (this->bbt_erase_shift + 2); | |
cfa460ad WJ |
966 | /* Allocate memory (2bit per block) and clear the memory bad block table */ |
967 | this->bbt = kzalloc(len, GFP_KERNEL); | |
932394ac | 968 | if (!this->bbt) { |
cfa460ad | 969 | printk(KERN_ERR "nand_scan_bbt: Out of memory\n"); |
932394ac WD |
970 | return -ENOMEM; |
971 | } | |
932394ac WD |
972 | |
973 | /* If no primary table decriptor is given, scan the device | |
974 | * to build a memory based bad block table | |
975 | */ | |
cfa460ad WJ |
976 | if (!td) { |
977 | if ((res = nand_memory_bbt(mtd, bd))) { | |
978 | printk(KERN_ERR "nand_bbt: Can't scan flash and build the RAM-based BBT\n"); | |
979 | kfree(this->bbt); | |
980 | this->bbt = NULL; | |
981 | } | |
982 | return res; | |
983 | } | |
932394ac WD |
984 | |
985 | /* Allocate a temporary buffer for one eraseblock incl. oob */ | |
986 | len = (1 << this->bbt_erase_shift); | |
987 | len += (len >> this->page_shift) * mtd->oobsize; | |
cfa460ad | 988 | buf = vmalloc(len); |
932394ac | 989 | if (!buf) { |
cfa460ad WJ |
990 | printk(KERN_ERR "nand_bbt: Out of memory\n"); |
991 | kfree(this->bbt); | |
932394ac WD |
992 | this->bbt = NULL; |
993 | return -ENOMEM; | |
994 | } | |
ac7eb8a3 | 995 | |
932394ac WD |
996 | /* Is the bbt at a given page ? */ |
997 | if (td->options & NAND_BBT_ABSPAGE) { | |
cfa460ad | 998 | res = read_abs_bbts(mtd, buf, td, md); |
ac7eb8a3 | 999 | } else { |
932394ac | 1000 | /* Search the bad block table using a pattern in oob */ |
cfa460ad | 1001 | res = search_read_bbts(mtd, buf, td, md); |
ac7eb8a3 | 1002 | } |
932394ac | 1003 | |
ac7eb8a3 | 1004 | if (res) |
cfa460ad | 1005 | res = check_create(mtd, buf, bd); |
ac7eb8a3 | 1006 | |
932394ac | 1007 | /* Prevent the bbt regions from erasing / writing */ |
cfa460ad | 1008 | mark_bbt_region(mtd, td); |
932394ac | 1009 | if (md) |
cfa460ad | 1010 | mark_bbt_region(mtd, md); |
ac7eb8a3 | 1011 | |
cfa460ad | 1012 | vfree(buf); |
932394ac WD |
1013 | return res; |
1014 | } | |
1015 | ||
932394ac | 1016 | /** |
ac7eb8a3 | 1017 | * nand_update_bbt - [NAND Interface] update bad block table(s) |
932394ac WD |
1018 | * @mtd: MTD device structure |
1019 | * @offs: the offset of the newly marked block | |
1020 | * | |
1021 | * The function updates the bad block table(s) | |
1022 | */ | |
cfa460ad | 1023 | int nand_update_bbt(struct mtd_info *mtd, loff_t offs) |
932394ac WD |
1024 | { |
1025 | struct nand_chip *this = mtd->priv; | |
1026 | int len, res = 0, writeops = 0; | |
1027 | int chip, chipsel; | |
1028 | uint8_t *buf; | |
1029 | struct nand_bbt_descr *td = this->bbt_td; | |
1030 | struct nand_bbt_descr *md = this->bbt_md; | |
1031 | ||
1032 | if (!this->bbt || !td) | |
1033 | return -EINVAL; | |
1034 | ||
932394ac WD |
1035 | /* Allocate a temporary buffer for one eraseblock incl. oob */ |
1036 | len = (1 << this->bbt_erase_shift); | |
1037 | len += (len >> this->page_shift) * mtd->oobsize; | |
cfa460ad | 1038 | buf = kmalloc(len, GFP_KERNEL); |
932394ac | 1039 | if (!buf) { |
cfa460ad | 1040 | printk(KERN_ERR "nand_update_bbt: Out of memory\n"); |
932394ac WD |
1041 | return -ENOMEM; |
1042 | } | |
ac7eb8a3 | 1043 | |
932394ac WD |
1044 | writeops = md != NULL ? 0x03 : 0x01; |
1045 | ||
1046 | /* Do we have a bbt per chip ? */ | |
1047 | if (td->options & NAND_BBT_PERCHIP) { | |
cfa460ad | 1048 | chip = (int)(offs >> this->chip_shift); |
932394ac WD |
1049 | chipsel = chip; |
1050 | } else { | |
1051 | chip = 0; | |
1052 | chipsel = -1; | |
1053 | } | |
1054 | ||
1055 | td->version[chip]++; | |
1056 | if (md) | |
ac7eb8a3 | 1057 | md->version[chip]++; |
932394ac WD |
1058 | |
1059 | /* Write the bad block table to the device ? */ | |
1060 | if ((writeops & 0x01) && (td->options & NAND_BBT_WRITE)) { | |
cfa460ad | 1061 | res = write_bbt(mtd, buf, td, md, chipsel); |
932394ac WD |
1062 | if (res < 0) |
1063 | goto out; | |
1064 | } | |
1065 | /* Write the mirror bad block table to the device ? */ | |
1066 | if ((writeops & 0x02) && md && (md->options & NAND_BBT_WRITE)) { | |
cfa460ad | 1067 | res = write_bbt(mtd, buf, md, td, chipsel); |
932394ac WD |
1068 | } |
1069 | ||
cfa460ad WJ |
1070 | out: |
1071 | kfree(buf); | |
932394ac WD |
1072 | return res; |
1073 | } | |
1074 | ||
ac7eb8a3 | 1075 | /* Define some generic bad / good block scan pattern which are used |
cfa460ad | 1076 | * while scanning a device for factory marked good / bad blocks. */ |
932394ac WD |
1077 | static uint8_t scan_ff_pattern[] = { 0xff, 0xff }; |
1078 | ||
1079 | static struct nand_bbt_descr smallpage_memorybased = { | |
cfa460ad | 1080 | .options = NAND_BBT_SCAN2NDPAGE, |
932394ac WD |
1081 | .offs = 5, |
1082 | .len = 1, | |
1083 | .pattern = scan_ff_pattern | |
1084 | }; | |
1085 | ||
1086 | static struct nand_bbt_descr largepage_memorybased = { | |
1087 | .options = 0, | |
1088 | .offs = 0, | |
1089 | .len = 2, | |
1090 | .pattern = scan_ff_pattern | |
1091 | }; | |
1092 | ||
1093 | static struct nand_bbt_descr smallpage_flashbased = { | |
cfa460ad | 1094 | .options = NAND_BBT_SCAN2NDPAGE, |
932394ac WD |
1095 | .offs = 5, |
1096 | .len = 1, | |
1097 | .pattern = scan_ff_pattern | |
1098 | }; | |
1099 | ||
1100 | static struct nand_bbt_descr largepage_flashbased = { | |
cfa460ad | 1101 | .options = NAND_BBT_SCAN2NDPAGE, |
932394ac WD |
1102 | .offs = 0, |
1103 | .len = 2, | |
1104 | .pattern = scan_ff_pattern | |
1105 | }; | |
1106 | ||
1107 | static uint8_t scan_agand_pattern[] = { 0x1C, 0x71, 0xC7, 0x1C, 0x71, 0xC7 }; | |
1108 | ||
1109 | static struct nand_bbt_descr agand_flashbased = { | |
1110 | .options = NAND_BBT_SCANEMPTY | NAND_BBT_SCANALLPAGES, | |
1111 | .offs = 0x20, | |
1112 | .len = 6, | |
1113 | .pattern = scan_agand_pattern | |
1114 | }; | |
1115 | ||
1116 | /* Generic flash bbt decriptors | |
1117 | */ | |
1118 | static uint8_t bbt_pattern[] = {'B', 'b', 't', '0' }; | |
1119 | static uint8_t mirror_pattern[] = {'1', 't', 'b', 'B' }; | |
1120 | ||
1121 | static struct nand_bbt_descr bbt_main_descr = { | |
ac7eb8a3 | 1122 | .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
932394ac WD |
1123 | | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP, |
1124 | .offs = 8, | |
1125 | .len = 4, | |
1126 | .veroffs = 12, | |
1127 | .maxblocks = 4, | |
1128 | .pattern = bbt_pattern | |
1129 | }; | |
1130 | ||
1131 | static struct nand_bbt_descr bbt_mirror_descr = { | |
ac7eb8a3 | 1132 | .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
932394ac WD |
1133 | | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP, |
1134 | .offs = 8, | |
1135 | .len = 4, | |
1136 | .veroffs = 12, | |
1137 | .maxblocks = 4, | |
1138 | .pattern = mirror_pattern | |
1139 | }; | |
1140 | ||
1141 | /** | |
ac7eb8a3 | 1142 | * nand_default_bbt - [NAND Interface] Select a default bad block table for the device |
932394ac WD |
1143 | * @mtd: MTD device structure |
1144 | * | |
1145 | * This function selects the default bad block table | |
1146 | * support for the device and calls the nand_scan_bbt function | |
1147 | * | |
1148 | */ | |
cfa460ad | 1149 | int nand_default_bbt(struct mtd_info *mtd) |
932394ac WD |
1150 | { |
1151 | struct nand_chip *this = mtd->priv; | |
ac7eb8a3 WD |
1152 | |
1153 | /* Default for AG-AND. We must use a flash based | |
932394ac WD |
1154 | * bad block table as the devices have factory marked |
1155 | * _good_ blocks. Erasing those blocks leads to loss | |
1156 | * of the good / bad information, so we _must_ store | |
ac7eb8a3 | 1157 | * this information in a good / bad table during |
932394ac | 1158 | * startup |
cfa460ad | 1159 | */ |
932394ac WD |
1160 | if (this->options & NAND_IS_AND) { |
1161 | /* Use the default pattern descriptors */ | |
ac7eb8a3 | 1162 | if (!this->bbt_td) { |
932394ac WD |
1163 | this->bbt_td = &bbt_main_descr; |
1164 | this->bbt_md = &bbt_mirror_descr; | |
ac7eb8a3 | 1165 | } |
932394ac | 1166 | this->options |= NAND_USE_FLASH_BBT; |
cfa460ad | 1167 | return nand_scan_bbt(mtd, &agand_flashbased); |
932394ac | 1168 | } |
ac7eb8a3 | 1169 | |
932394ac WD |
1170 | /* Is a flash based bad block table requested ? */ |
1171 | if (this->options & NAND_USE_FLASH_BBT) { | |
ac7eb8a3 WD |
1172 | /* Use the default pattern descriptors */ |
1173 | if (!this->bbt_td) { | |
932394ac WD |
1174 | this->bbt_td = &bbt_main_descr; |
1175 | this->bbt_md = &bbt_mirror_descr; | |
1176 | } | |
1177 | if (!this->badblock_pattern) { | |
cfa460ad | 1178 | this->badblock_pattern = (mtd->writesize > 512) ? &largepage_flashbased : &smallpage_flashbased; |
932394ac WD |
1179 | } |
1180 | } else { | |
1181 | this->bbt_td = NULL; | |
1182 | this->bbt_md = NULL; | |
1183 | if (!this->badblock_pattern) { | |
cfa460ad WJ |
1184 | this->badblock_pattern = (mtd->writesize > 512) ? |
1185 | &largepage_memorybased : &smallpage_memorybased; | |
932394ac WD |
1186 | } |
1187 | } | |
cfa460ad | 1188 | return nand_scan_bbt(mtd, this->badblock_pattern); |
932394ac WD |
1189 | } |
1190 | ||
1191 | /** | |
ac7eb8a3 | 1192 | * nand_isbad_bbt - [NAND Interface] Check if a block is bad |
932394ac WD |
1193 | * @mtd: MTD device structure |
1194 | * @offs: offset in the device | |
1195 | * @allowbbt: allow access to bad block table region | |
1196 | * | |
cfa460ad WJ |
1197 | */ |
1198 | int nand_isbad_bbt(struct mtd_info *mtd, loff_t offs, int allowbbt) | |
932394ac WD |
1199 | { |
1200 | struct nand_chip *this = mtd->priv; | |
1201 | int block; | |
cfa460ad | 1202 | uint8_t res; |
ac7eb8a3 | 1203 | |
932394ac | 1204 | /* Get block number * 2 */ |
cfa460ad | 1205 | block = (int)(offs >> (this->bbt_erase_shift - 1)); |
932394ac WD |
1206 | res = (this->bbt[block >> 3] >> (block & 0x06)) & 0x03; |
1207 | ||
3167c538 SW |
1208 | MTDDEBUG (MTD_DEBUG_LEVEL2, "nand_isbad_bbt(): bbt info for offs 0x%08x: " |
1209 | "(block %d) 0x%02x\n", (unsigned int)offs, res, block >> 1); | |
932394ac WD |
1210 | |
1211 | switch ((int)res) { | |
cfa460ad WJ |
1212 | case 0x00: |
1213 | return 0; | |
1214 | case 0x01: | |
1215 | return 1; | |
1216 | case 0x02: | |
1217 | return allowbbt ? 0 : 1; | |
932394ac WD |
1218 | } |
1219 | return 1; | |
1220 | } |