Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * drivers/mtd/nand_bbt.c | |
3 | * | |
4 | * Overview: | |
5 | * Bad block table support for the NAND driver | |
61b03bd7 | 6 | * |
1da177e4 LT |
7 | * Copyright (C) 2004 Thomas Gleixner (tglx@linutronix.de) |
8 | * | |
1da177e4 LT |
9 | * This program is free software; you can redistribute it and/or modify |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | * | |
13 | * Description: | |
14 | * | |
61b03bd7 TG |
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 | |
1da177e4 | 18 | * mirrored bbt is selected then the mirror is searched too and the |
61b03bd7 | 19 | * versions are compared. If the mirror has a greater version number |
1da177e4 LT |
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. | |
61b03bd7 TG |
22 | * If one of the bbt's is out of date or does not exist it is (re)created.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. | |
1da177e4 | 25 | * |
61b03bd7 | 26 | * For manufacturer created bbts like the one found on M-SYS DOC devices |
1da177e4 LT |
27 | * the bbt is searched and read but never created |
28 | * | |
61b03bd7 TG |
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 | |
1da177e4 LT |
32 | * number which indicates which of both tables is more up to date. |
33 | * | |
34 | * The table uses 2 bits per block | |
35 | * 11b: block is good | |
36 | * 00b: block is factory marked bad | |
37 | * 01b, 10b: block is marked bad due to wear | |
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 | |
61b03bd7 | 44 | * |
1da177e4 LT |
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 | |
e0c7d767 | 49 | * - the space necessary for a bbt in FLASH does not exceed a block boundary |
61b03bd7 | 50 | * |
1da177e4 LT |
51 | */ |
52 | ||
53 | #include <linux/slab.h> | |
54 | #include <linux/types.h> | |
55 | #include <linux/mtd/mtd.h> | |
56 | #include <linux/mtd/nand.h> | |
57 | #include <linux/mtd/nand_ecc.h> | |
58 | #include <linux/mtd/compatmac.h> | |
59 | #include <linux/bitops.h> | |
60 | #include <linux/delay.h> | |
c3f8abf4 | 61 | #include <linux/vmalloc.h> |
1da177e4 | 62 | |
61b03bd7 | 63 | /** |
1da177e4 LT |
64 | * check_pattern - [GENERIC] check if a pattern is in the buffer |
65 | * @buf: the buffer to search | |
66 | * @len: the length of buffer to search | |
67 | * @paglen: the pagelength | |
68 | * @td: search pattern descriptor | |
69 | * | |
70 | * Check for a pattern at the given place. Used to search bad block | |
71 | * tables and good / bad block identifiers. | |
72 | * If the SCAN_EMPTY option is set then check, if all bytes except the | |
73 | * pattern area contain 0xff | |
74 | * | |
75 | */ | |
e0c7d767 | 76 | static int check_pattern(uint8_t *buf, int len, int paglen, struct nand_bbt_descr *td) |
1da177e4 | 77 | { |
171650af | 78 | int i, end = 0; |
1da177e4 LT |
79 | uint8_t *p = buf; |
80 | ||
c9e05365 | 81 | end = paglen + td->offs; |
1da177e4 LT |
82 | if (td->options & NAND_BBT_SCANEMPTY) { |
83 | for (i = 0; i < end; i++) { | |
84 | if (p[i] != 0xff) | |
85 | return -1; | |
86 | } | |
61b03bd7 | 87 | } |
c9e05365 | 88 | p += end; |
61b03bd7 | 89 | |
1da177e4 LT |
90 | /* Compare the pattern */ |
91 | for (i = 0; i < td->len; i++) { | |
92 | if (p[i] != td->pattern[i]) | |
93 | return -1; | |
94 | } | |
95 | ||
1da177e4 | 96 | if (td->options & NAND_BBT_SCANEMPTY) { |
171650af AB |
97 | p += td->len; |
98 | end += td->len; | |
1da177e4 LT |
99 | for (i = end; i < len; i++) { |
100 | if (*p++ != 0xff) | |
101 | return -1; | |
102 | } | |
103 | } | |
104 | return 0; | |
105 | } | |
106 | ||
61b03bd7 | 107 | /** |
c9e05365 TG |
108 | * check_short_pattern - [GENERIC] check if a pattern is in the buffer |
109 | * @buf: the buffer to search | |
c9e05365 TG |
110 | * @td: search pattern descriptor |
111 | * | |
112 | * Check for a pattern at the given place. Used to search bad block | |
61b03bd7 | 113 | * tables and good / bad block identifiers. Same as check_pattern, but |
19870da7 | 114 | * no optional empty check |
c9e05365 TG |
115 | * |
116 | */ | |
e0c7d767 | 117 | static int check_short_pattern(uint8_t *buf, struct nand_bbt_descr *td) |
c9e05365 TG |
118 | { |
119 | int i; | |
120 | uint8_t *p = buf; | |
121 | ||
122 | /* Compare the pattern */ | |
123 | for (i = 0; i < td->len; i++) { | |
19870da7 | 124 | if (p[td->offs + i] != td->pattern[i]) |
c9e05365 TG |
125 | return -1; |
126 | } | |
127 | return 0; | |
128 | } | |
129 | ||
1da177e4 LT |
130 | /** |
131 | * read_bbt - [GENERIC] Read the bad block table starting from page | |
132 | * @mtd: MTD device structure | |
133 | * @buf: temporary buffer | |
134 | * @page: the starting page | |
135 | * @num: the number of bbt descriptors to read | |
136 | * @bits: number of bits per block | |
137 | * @offs: offset in the memory table | |
138 | * @reserved_block_code: Pattern to identify reserved blocks | |
139 | * | |
140 | * Read the bad block table starting from page. | |
141 | * | |
142 | */ | |
e0c7d767 DW |
143 | static int read_bbt(struct mtd_info *mtd, uint8_t *buf, int page, int num, |
144 | int bits, int offs, int reserved_block_code) | |
1da177e4 LT |
145 | { |
146 | int res, i, j, act = 0; | |
147 | struct nand_chip *this = mtd->priv; | |
148 | size_t retlen, len, totlen; | |
149 | loff_t from; | |
150 | uint8_t msk = (uint8_t) ((1 << bits) - 1); | |
151 | ||
152 | totlen = (num * bits) >> 3; | |
e0c7d767 | 153 | from = ((loff_t) page) << this->page_shift; |
61b03bd7 | 154 | |
1da177e4 | 155 | while (totlen) { |
e0c7d767 | 156 | len = min(totlen, (size_t) (1 << this->bbt_erase_shift)); |
9223a456 | 157 | res = mtd->read(mtd, from, len, &retlen, buf); |
1da177e4 LT |
158 | if (res < 0) { |
159 | if (retlen != len) { | |
e0c7d767 | 160 | printk(KERN_INFO "nand_bbt: Error reading bad block table\n"); |
1da177e4 LT |
161 | return res; |
162 | } | |
e0c7d767 | 163 | printk(KERN_WARNING "nand_bbt: ECC error while reading bad block table\n"); |
61b03bd7 | 164 | } |
1da177e4 LT |
165 | |
166 | /* Analyse data */ | |
167 | for (i = 0; i < len; i++) { | |
168 | uint8_t dat = buf[i]; | |
169 | for (j = 0; j < 8; j += bits, act += 2) { | |
170 | uint8_t tmp = (dat >> j) & msk; | |
171 | if (tmp == msk) | |
172 | continue; | |
e0c7d767 | 173 | if (reserved_block_code && (tmp == reserved_block_code)) { |
69423d99 AH |
174 | printk(KERN_DEBUG "nand_read_bbt: Reserved block at 0x%012llx\n", |
175 | (loff_t)((offs << 2) + (act >> 1)) << this->bbt_erase_shift); | |
1da177e4 | 176 | this->bbt[offs + (act >> 3)] |= 0x2 << (act & 0x06); |
f1a28c02 | 177 | mtd->ecc_stats.bbtblocks++; |
1da177e4 LT |
178 | continue; |
179 | } | |
180 | /* Leave it for now, if its matured we can move this | |
181 | * message to MTD_DEBUG_LEVEL0 */ | |
69423d99 AH |
182 | printk(KERN_DEBUG "nand_read_bbt: Bad block at 0x%012llx\n", |
183 | (loff_t)((offs << 2) + (act >> 1)) << this->bbt_erase_shift); | |
61b03bd7 | 184 | /* Factory marked bad or worn out ? */ |
1da177e4 LT |
185 | if (tmp == 0) |
186 | this->bbt[offs + (act >> 3)] |= 0x3 << (act & 0x06); | |
187 | else | |
188 | this->bbt[offs + (act >> 3)] |= 0x1 << (act & 0x06); | |
f1a28c02 | 189 | mtd->ecc_stats.badblocks++; |
61b03bd7 | 190 | } |
1da177e4 LT |
191 | } |
192 | totlen -= len; | |
193 | from += len; | |
194 | } | |
195 | return 0; | |
196 | } | |
197 | ||
198 | /** | |
199 | * read_abs_bbt - [GENERIC] Read the bad block table starting at a given page | |
200 | * @mtd: MTD device structure | |
201 | * @buf: temporary buffer | |
61b03bd7 | 202 | * @td: descriptor for the bad block table |
1da177e4 LT |
203 | * @chip: read the table for a specific chip, -1 read all chips. |
204 | * Applies only if NAND_BBT_PERCHIP option is set | |
205 | * | |
206 | * Read the bad block table for all chips starting at a given page | |
207 | * We assume that the bbt bits are in consecutive order. | |
208 | */ | |
e0c7d767 | 209 | static int read_abs_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td, int chip) |
1da177e4 LT |
210 | { |
211 | struct nand_chip *this = mtd->priv; | |
212 | int res = 0, i; | |
213 | int bits; | |
214 | ||
215 | bits = td->options & NAND_BBT_NRBITS_MSK; | |
216 | if (td->options & NAND_BBT_PERCHIP) { | |
217 | int offs = 0; | |
218 | for (i = 0; i < this->numchips; i++) { | |
219 | if (chip == -1 || chip == i) | |
220 | res = read_bbt (mtd, buf, td->pages[i], this->chipsize >> this->bbt_erase_shift, bits, offs, td->reserved_block_code); | |
221 | if (res) | |
222 | return res; | |
223 | offs += this->chipsize >> (this->bbt_erase_shift + 2); | |
224 | } | |
225 | } else { | |
226 | res = read_bbt (mtd, buf, td->pages[0], mtd->size >> this->bbt_erase_shift, bits, 0, td->reserved_block_code); | |
227 | if (res) | |
228 | return res; | |
229 | } | |
230 | return 0; | |
231 | } | |
232 | ||
8593fbc6 TG |
233 | /* |
234 | * Scan read raw data from flash | |
235 | */ | |
236 | static int scan_read_raw(struct mtd_info *mtd, uint8_t *buf, loff_t offs, | |
237 | size_t len) | |
238 | { | |
239 | struct mtd_oob_ops ops; | |
b64d39d8 | 240 | int res; |
8593fbc6 TG |
241 | |
242 | ops.mode = MTD_OOB_RAW; | |
243 | ops.ooboffs = 0; | |
244 | ops.ooblen = mtd->oobsize; | |
8593fbc6 | 245 | |
b64d39d8 ML |
246 | |
247 | while (len > 0) { | |
248 | if (len <= mtd->writesize) { | |
249 | ops.oobbuf = buf + len; | |
250 | ops.datbuf = buf; | |
251 | ops.len = len; | |
252 | return mtd->read_oob(mtd, offs, &ops); | |
253 | } else { | |
254 | ops.oobbuf = buf + mtd->writesize; | |
255 | ops.datbuf = buf; | |
256 | ops.len = mtd->writesize; | |
257 | res = mtd->read_oob(mtd, offs, &ops); | |
258 | ||
259 | if (res) | |
260 | return res; | |
261 | } | |
262 | ||
263 | buf += mtd->oobsize + mtd->writesize; | |
264 | len -= mtd->writesize; | |
265 | } | |
266 | return 0; | |
8593fbc6 TG |
267 | } |
268 | ||
269 | /* | |
270 | * Scan write data with oob to flash | |
271 | */ | |
272 | static int scan_write_bbt(struct mtd_info *mtd, loff_t offs, size_t len, | |
273 | uint8_t *buf, uint8_t *oob) | |
274 | { | |
275 | struct mtd_oob_ops ops; | |
276 | ||
277 | ops.mode = MTD_OOB_PLACE; | |
278 | ops.ooboffs = 0; | |
279 | ops.ooblen = mtd->oobsize; | |
280 | ops.datbuf = buf; | |
281 | ops.oobbuf = oob; | |
282 | ops.len = len; | |
283 | ||
284 | return mtd->write_oob(mtd, offs, &ops); | |
285 | } | |
286 | ||
1da177e4 LT |
287 | /** |
288 | * read_abs_bbts - [GENERIC] Read the bad block table(s) for all chips starting at a given page | |
289 | * @mtd: MTD device structure | |
290 | * @buf: temporary buffer | |
61b03bd7 | 291 | * @td: descriptor for the bad block table |
1da177e4 LT |
292 | * @md: descriptor for the bad block table mirror |
293 | * | |
294 | * Read the bad block table(s) for all chips starting at a given page | |
295 | * We assume that the bbt bits are in consecutive order. | |
296 | * | |
297 | */ | |
8593fbc6 TG |
298 | static int read_abs_bbts(struct mtd_info *mtd, uint8_t *buf, |
299 | struct nand_bbt_descr *td, struct nand_bbt_descr *md) | |
1da177e4 LT |
300 | { |
301 | struct nand_chip *this = mtd->priv; | |
302 | ||
61b03bd7 | 303 | /* Read the primary version, if available */ |
1da177e4 | 304 | if (td->options & NAND_BBT_VERSION) { |
69423d99 | 305 | scan_read_raw(mtd, buf, (loff_t)td->pages[0] << this->page_shift, |
8593fbc6 | 306 | mtd->writesize); |
28318776 | 307 | td->version[0] = buf[mtd->writesize + td->veroffs]; |
8593fbc6 TG |
308 | printk(KERN_DEBUG "Bad block table at page %d, version 0x%02X\n", |
309 | td->pages[0], td->version[0]); | |
1da177e4 LT |
310 | } |
311 | ||
61b03bd7 | 312 | /* Read the mirror version, if available */ |
1da177e4 | 313 | if (md && (md->options & NAND_BBT_VERSION)) { |
69423d99 | 314 | scan_read_raw(mtd, buf, (loff_t)md->pages[0] << this->page_shift, |
8593fbc6 | 315 | mtd->writesize); |
28318776 | 316 | md->version[0] = buf[mtd->writesize + md->veroffs]; |
8593fbc6 TG |
317 | printk(KERN_DEBUG "Bad block table at page %d, version 0x%02X\n", |
318 | md->pages[0], md->version[0]); | |
1da177e4 | 319 | } |
1da177e4 LT |
320 | return 1; |
321 | } | |
322 | ||
8593fbc6 TG |
323 | /* |
324 | * Scan a given block full | |
325 | */ | |
326 | static int scan_block_full(struct mtd_info *mtd, struct nand_bbt_descr *bd, | |
327 | loff_t offs, uint8_t *buf, size_t readlen, | |
328 | int scanlen, int len) | |
329 | { | |
330 | int ret, j; | |
331 | ||
332 | ret = scan_read_raw(mtd, buf, offs, readlen); | |
333 | if (ret) | |
334 | return ret; | |
335 | ||
336 | for (j = 0; j < len; j++, buf += scanlen) { | |
337 | if (check_pattern(buf, scanlen, mtd->writesize, bd)) | |
338 | return 1; | |
339 | } | |
340 | return 0; | |
341 | } | |
342 | ||
343 | /* | |
344 | * Scan a given block partially | |
345 | */ | |
346 | static int scan_block_fast(struct mtd_info *mtd, struct nand_bbt_descr *bd, | |
347 | loff_t offs, uint8_t *buf, int len) | |
348 | { | |
349 | struct mtd_oob_ops ops; | |
350 | int j, ret; | |
351 | ||
8593fbc6 TG |
352 | ops.ooblen = mtd->oobsize; |
353 | ops.oobbuf = buf; | |
354 | ops.ooboffs = 0; | |
355 | ops.datbuf = NULL; | |
356 | ops.mode = MTD_OOB_PLACE; | |
357 | ||
358 | for (j = 0; j < len; j++) { | |
359 | /* | |
360 | * Read the full oob until read_oob is fixed to | |
361 | * handle single byte reads for 16 bit | |
362 | * buswidth | |
363 | */ | |
364 | ret = mtd->read_oob(mtd, offs, &ops); | |
365 | if (ret) | |
366 | return ret; | |
367 | ||
368 | if (check_short_pattern(buf, bd)) | |
369 | return 1; | |
370 | ||
371 | offs += mtd->writesize; | |
372 | } | |
373 | return 0; | |
374 | } | |
375 | ||
1da177e4 LT |
376 | /** |
377 | * create_bbt - [GENERIC] Create a bad block table by scanning the device | |
378 | * @mtd: MTD device structure | |
379 | * @buf: temporary buffer | |
380 | * @bd: descriptor for the good/bad block search pattern | |
381 | * @chip: create the table for a specific chip, -1 read all chips. | |
382 | * Applies only if NAND_BBT_PERCHIP option is set | |
383 | * | |
384 | * Create a bad block table by scanning the device | |
385 | * for the given good/bad block identify pattern | |
386 | */ | |
8593fbc6 TG |
387 | static int create_bbt(struct mtd_info *mtd, uint8_t *buf, |
388 | struct nand_bbt_descr *bd, int chip) | |
1da177e4 LT |
389 | { |
390 | struct nand_chip *this = mtd->priv; | |
8593fbc6 | 391 | int i, numblocks, len, scanlen; |
1da177e4 LT |
392 | int startblock; |
393 | loff_t from; | |
8593fbc6 | 394 | size_t readlen; |
1da177e4 | 395 | |
e0c7d767 | 396 | printk(KERN_INFO "Scanning device for bad blocks\n"); |
1da177e4 LT |
397 | |
398 | if (bd->options & NAND_BBT_SCANALLPAGES) | |
399 | len = 1 << (this->bbt_erase_shift - this->page_shift); | |
400 | else { | |
401 | if (bd->options & NAND_BBT_SCAN2NDPAGE) | |
402 | len = 2; | |
61b03bd7 | 403 | else |
1da177e4 LT |
404 | len = 1; |
405 | } | |
171650af AB |
406 | |
407 | if (!(bd->options & NAND_BBT_SCANEMPTY)) { | |
408 | /* We need only read few bytes from the OOB area */ | |
8593fbc6 | 409 | scanlen = 0; |
eeada24d AB |
410 | readlen = bd->len; |
411 | } else { | |
171650af | 412 | /* Full page content should be read */ |
28318776 JE |
413 | scanlen = mtd->writesize + mtd->oobsize; |
414 | readlen = len * mtd->writesize; | |
eeada24d | 415 | } |
1da177e4 LT |
416 | |
417 | if (chip == -1) { | |
8593fbc6 TG |
418 | /* Note that numblocks is 2 * (real numblocks) here, see i+=2 |
419 | * below as it makes shifting and masking less painful */ | |
1da177e4 LT |
420 | numblocks = mtd->size >> (this->bbt_erase_shift - 1); |
421 | startblock = 0; | |
422 | from = 0; | |
423 | } else { | |
424 | if (chip >= this->numchips) { | |
e0c7d767 DW |
425 | printk(KERN_WARNING "create_bbt(): chipnr (%d) > available chips (%d)\n", |
426 | chip + 1, this->numchips); | |
171650af | 427 | return -EINVAL; |
1da177e4 LT |
428 | } |
429 | numblocks = this->chipsize >> (this->bbt_erase_shift - 1); | |
430 | startblock = chip * numblocks; | |
431 | numblocks += startblock; | |
69423d99 | 432 | from = (loff_t)startblock << (this->bbt_erase_shift - 1); |
1da177e4 | 433 | } |
61b03bd7 | 434 | |
30fe8115 | 435 | if (this->options & NAND_BBT_SCANLASTPAGE) |
b60b08b0 KC |
436 | from += mtd->erasesize - (mtd->writesize * len); |
437 | ||
1da177e4 | 438 | for (i = startblock; i < numblocks;) { |
eeada24d | 439 | int ret; |
61b03bd7 | 440 | |
8593fbc6 TG |
441 | if (bd->options & NAND_BBT_SCANALLPAGES) |
442 | ret = scan_block_full(mtd, bd, from, buf, readlen, | |
443 | scanlen, len); | |
444 | else | |
445 | ret = scan_block_fast(mtd, bd, from, buf, len); | |
446 | ||
447 | if (ret < 0) | |
448 | return ret; | |
449 | ||
450 | if (ret) { | |
451 | this->bbt[i >> 3] |= 0x03 << (i & 0x6); | |
69423d99 AH |
452 | printk(KERN_WARNING "Bad eraseblock %d at 0x%012llx\n", |
453 | i >> 1, (unsigned long long)from); | |
f1a28c02 | 454 | mtd->ecc_stats.badblocks++; |
1da177e4 | 455 | } |
8593fbc6 | 456 | |
1da177e4 LT |
457 | i += 2; |
458 | from += (1 << this->bbt_erase_shift); | |
459 | } | |
eeada24d | 460 | return 0; |
1da177e4 LT |
461 | } |
462 | ||
463 | /** | |
464 | * search_bbt - [GENERIC] scan the device for a specific bad block table | |
465 | * @mtd: MTD device structure | |
466 | * @buf: temporary buffer | |
467 | * @td: descriptor for the bad block table | |
468 | * | |
469 | * Read the bad block table by searching for a given ident pattern. | |
61b03bd7 | 470 | * Search is preformed either from the beginning up or from the end of |
1da177e4 LT |
471 | * the device downwards. The search starts always at the start of a |
472 | * block. | |
61b03bd7 | 473 | * If the option NAND_BBT_PERCHIP is given, each chip is searched |
1da177e4 | 474 | * for a bbt, which contains the bad block information of this chip. |
e0c7d767 | 475 | * This is necessary to provide support for certain DOC devices. |
1da177e4 | 476 | * |
61b03bd7 TG |
477 | * The bbt ident pattern resides in the oob area of the first page |
478 | * in a block. | |
1da177e4 | 479 | */ |
e0c7d767 | 480 | static int search_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td) |
1da177e4 LT |
481 | { |
482 | struct nand_chip *this = mtd->priv; | |
483 | int i, chips; | |
484 | int bits, startblock, block, dir; | |
28318776 | 485 | int scanlen = mtd->writesize + mtd->oobsize; |
1da177e4 | 486 | int bbtblocks; |
8593fbc6 | 487 | int blocktopage = this->bbt_erase_shift - this->page_shift; |
1da177e4 LT |
488 | |
489 | /* Search direction top -> down ? */ | |
490 | if (td->options & NAND_BBT_LASTBLOCK) { | |
e0c7d767 | 491 | startblock = (mtd->size >> this->bbt_erase_shift) - 1; |
1da177e4 LT |
492 | dir = -1; |
493 | } else { | |
61b03bd7 | 494 | startblock = 0; |
1da177e4 | 495 | dir = 1; |
61b03bd7 TG |
496 | } |
497 | ||
1da177e4 LT |
498 | /* Do we have a bbt per chip ? */ |
499 | if (td->options & NAND_BBT_PERCHIP) { | |
500 | chips = this->numchips; | |
501 | bbtblocks = this->chipsize >> this->bbt_erase_shift; | |
502 | startblock &= bbtblocks - 1; | |
503 | } else { | |
504 | chips = 1; | |
505 | bbtblocks = mtd->size >> this->bbt_erase_shift; | |
506 | } | |
61b03bd7 | 507 | |
1da177e4 LT |
508 | /* Number of bits for each erase block in the bbt */ |
509 | bits = td->options & NAND_BBT_NRBITS_MSK; | |
61b03bd7 | 510 | |
1da177e4 LT |
511 | for (i = 0; i < chips; i++) { |
512 | /* Reset version information */ | |
61b03bd7 | 513 | td->version[i] = 0; |
1da177e4 LT |
514 | td->pages[i] = -1; |
515 | /* Scan the maximum number of blocks */ | |
516 | for (block = 0; block < td->maxblocks; block++) { | |
8593fbc6 | 517 | |
1da177e4 | 518 | int actblock = startblock + dir * block; |
69423d99 | 519 | loff_t offs = (loff_t)actblock << this->bbt_erase_shift; |
8593fbc6 | 520 | |
1da177e4 | 521 | /* Read first page */ |
8593fbc6 | 522 | scan_read_raw(mtd, buf, offs, mtd->writesize); |
28318776 | 523 | if (!check_pattern(buf, scanlen, mtd->writesize, td)) { |
8593fbc6 | 524 | td->pages[i] = actblock << blocktopage; |
1da177e4 | 525 | if (td->options & NAND_BBT_VERSION) { |
28318776 | 526 | td->version[i] = buf[mtd->writesize + td->veroffs]; |
1da177e4 LT |
527 | } |
528 | break; | |
529 | } | |
530 | } | |
531 | startblock += this->chipsize >> this->bbt_erase_shift; | |
532 | } | |
533 | /* Check, if we found a bbt for each requested chip */ | |
534 | for (i = 0; i < chips; i++) { | |
535 | if (td->pages[i] == -1) | |
e0c7d767 | 536 | printk(KERN_WARNING "Bad block table not found for chip %d\n", i); |
1da177e4 | 537 | else |
e0c7d767 DW |
538 | printk(KERN_DEBUG "Bad block table found at page %d, version 0x%02X\n", td->pages[i], |
539 | td->version[i]); | |
1da177e4 | 540 | } |
61b03bd7 | 541 | return 0; |
1da177e4 LT |
542 | } |
543 | ||
544 | /** | |
545 | * search_read_bbts - [GENERIC] scan the device for bad block table(s) | |
546 | * @mtd: MTD device structure | |
547 | * @buf: temporary buffer | |
61b03bd7 | 548 | * @td: descriptor for the bad block table |
1da177e4 LT |
549 | * @md: descriptor for the bad block table mirror |
550 | * | |
551 | * Search and read the bad block table(s) | |
552 | */ | |
e0c7d767 | 553 | static int search_read_bbts(struct mtd_info *mtd, uint8_t * buf, struct nand_bbt_descr *td, struct nand_bbt_descr *md) |
1da177e4 LT |
554 | { |
555 | /* Search the primary table */ | |
e0c7d767 | 556 | search_bbt(mtd, buf, td); |
61b03bd7 | 557 | |
1da177e4 LT |
558 | /* Search the mirror table */ |
559 | if (md) | |
e0c7d767 | 560 | search_bbt(mtd, buf, md); |
61b03bd7 | 561 | |
1da177e4 | 562 | /* Force result check */ |
61b03bd7 | 563 | return 1; |
1da177e4 | 564 | } |
1da177e4 | 565 | |
61b03bd7 | 566 | /** |
1da177e4 LT |
567 | * write_bbt - [GENERIC] (Re)write the bad block table |
568 | * | |
569 | * @mtd: MTD device structure | |
570 | * @buf: temporary buffer | |
61b03bd7 | 571 | * @td: descriptor for the bad block table |
1da177e4 LT |
572 | * @md: descriptor for the bad block table mirror |
573 | * @chipsel: selector for a specific chip, -1 for all | |
574 | * | |
575 | * (Re)write the bad block table | |
576 | * | |
577 | */ | |
e0c7d767 | 578 | static int write_bbt(struct mtd_info *mtd, uint8_t *buf, |
9223a456 TG |
579 | struct nand_bbt_descr *td, struct nand_bbt_descr *md, |
580 | int chipsel) | |
1da177e4 LT |
581 | { |
582 | struct nand_chip *this = mtd->priv; | |
1da177e4 LT |
583 | struct erase_info einfo; |
584 | int i, j, res, chip = 0; | |
585 | int bits, startblock, dir, page, offs, numblocks, sft, sftmsk; | |
9223a456 | 586 | int nrchips, bbtoffs, pageoffs, ooboffs; |
1da177e4 LT |
587 | uint8_t msk[4]; |
588 | uint8_t rcode = td->reserved_block_code; | |
8593fbc6 | 589 | size_t retlen, len = 0; |
1da177e4 | 590 | loff_t to; |
8593fbc6 TG |
591 | struct mtd_oob_ops ops; |
592 | ||
593 | ops.ooblen = mtd->oobsize; | |
594 | ops.ooboffs = 0; | |
595 | ops.datbuf = NULL; | |
596 | ops.mode = MTD_OOB_PLACE; | |
1da177e4 LT |
597 | |
598 | if (!rcode) | |
599 | rcode = 0xff; | |
600 | /* Write bad block table per chip rather than per device ? */ | |
601 | if (td->options & NAND_BBT_PERCHIP) { | |
e0c7d767 | 602 | numblocks = (int)(this->chipsize >> this->bbt_erase_shift); |
61b03bd7 | 603 | /* Full device write or specific chip ? */ |
1da177e4 LT |
604 | if (chipsel == -1) { |
605 | nrchips = this->numchips; | |
606 | } else { | |
607 | nrchips = chipsel + 1; | |
608 | chip = chipsel; | |
609 | } | |
610 | } else { | |
e0c7d767 | 611 | numblocks = (int)(mtd->size >> this->bbt_erase_shift); |
1da177e4 | 612 | nrchips = 1; |
61b03bd7 TG |
613 | } |
614 | ||
1da177e4 LT |
615 | /* Loop through the chips */ |
616 | for (; chip < nrchips; chip++) { | |
61b03bd7 TG |
617 | |
618 | /* There was already a version of the table, reuse the page | |
619 | * This applies for absolute placement too, as we have the | |
1da177e4 LT |
620 | * page nr. in td->pages. |
621 | */ | |
622 | if (td->pages[chip] != -1) { | |
623 | page = td->pages[chip]; | |
624 | goto write; | |
61b03bd7 | 625 | } |
1da177e4 LT |
626 | |
627 | /* Automatic placement of the bad block table */ | |
628 | /* Search direction top -> down ? */ | |
629 | if (td->options & NAND_BBT_LASTBLOCK) { | |
630 | startblock = numblocks * (chip + 1) - 1; | |
631 | dir = -1; | |
632 | } else { | |
633 | startblock = chip * numblocks; | |
634 | dir = 1; | |
61b03bd7 | 635 | } |
1da177e4 LT |
636 | |
637 | for (i = 0; i < td->maxblocks; i++) { | |
638 | int block = startblock + dir * i; | |
639 | /* Check, if the block is bad */ | |
9223a456 TG |
640 | switch ((this->bbt[block >> 2] >> |
641 | (2 * (block & 0x03))) & 0x03) { | |
1da177e4 LT |
642 | case 0x01: |
643 | case 0x03: | |
644 | continue; | |
645 | } | |
9223a456 TG |
646 | page = block << |
647 | (this->bbt_erase_shift - this->page_shift); | |
1da177e4 LT |
648 | /* Check, if the block is used by the mirror table */ |
649 | if (!md || md->pages[chip] != page) | |
650 | goto write; | |
651 | } | |
e0c7d767 | 652 | printk(KERN_ERR "No space left to write bad block table\n"); |
1da177e4 | 653 | return -ENOSPC; |
e0c7d767 | 654 | write: |
1da177e4 LT |
655 | |
656 | /* Set up shift count and masks for the flash table */ | |
657 | bits = td->options & NAND_BBT_NRBITS_MSK; | |
9223a456 | 658 | msk[2] = ~rcode; |
1da177e4 | 659 | switch (bits) { |
9223a456 TG |
660 | case 1: sft = 3; sftmsk = 0x07; msk[0] = 0x00; msk[1] = 0x01; |
661 | msk[3] = 0x01; | |
662 | break; | |
663 | case 2: sft = 2; sftmsk = 0x06; msk[0] = 0x00; msk[1] = 0x01; | |
664 | msk[3] = 0x03; | |
665 | break; | |
666 | case 4: sft = 1; sftmsk = 0x04; msk[0] = 0x00; msk[1] = 0x0C; | |
667 | msk[3] = 0x0f; | |
668 | break; | |
669 | case 8: sft = 0; sftmsk = 0x00; msk[0] = 0x00; msk[1] = 0x0F; | |
670 | msk[3] = 0xff; | |
671 | break; | |
1da177e4 LT |
672 | default: return -EINVAL; |
673 | } | |
61b03bd7 | 674 | |
1da177e4 | 675 | bbtoffs = chip * (numblocks >> 2); |
61b03bd7 | 676 | |
1da177e4 LT |
677 | to = ((loff_t) page) << this->page_shift; |
678 | ||
1da177e4 LT |
679 | /* Must we save the block contents ? */ |
680 | if (td->options & NAND_BBT_SAVECONTENT) { | |
681 | /* Make it block aligned */ | |
682 | to &= ~((loff_t) ((1 << this->bbt_erase_shift) - 1)); | |
683 | len = 1 << this->bbt_erase_shift; | |
9223a456 | 684 | res = mtd->read(mtd, to, len, &retlen, buf); |
1da177e4 LT |
685 | if (res < 0) { |
686 | if (retlen != len) { | |
9223a456 TG |
687 | printk(KERN_INFO "nand_bbt: Error " |
688 | "reading block for writing " | |
689 | "the bad block table\n"); | |
1da177e4 LT |
690 | return res; |
691 | } | |
9223a456 TG |
692 | printk(KERN_WARNING "nand_bbt: ECC error " |
693 | "while reading block for writing " | |
694 | "bad block table\n"); | |
1da177e4 | 695 | } |
9223a456 | 696 | /* Read oob data */ |
7014568b | 697 | ops.ooblen = (len >> this->page_shift) * mtd->oobsize; |
8593fbc6 TG |
698 | ops.oobbuf = &buf[len]; |
699 | res = mtd->read_oob(mtd, to + mtd->writesize, &ops); | |
7014568b | 700 | if (res < 0 || ops.oobretlen != ops.ooblen) |
9223a456 TG |
701 | goto outerr; |
702 | ||
1da177e4 LT |
703 | /* Calc the byte offset in the buffer */ |
704 | pageoffs = page - (int)(to >> this->page_shift); | |
705 | offs = pageoffs << this->page_shift; | |
706 | /* Preset the bbt area with 0xff */ | |
e0c7d767 | 707 | memset(&buf[offs], 0xff, (size_t) (numblocks >> sft)); |
9223a456 TG |
708 | ooboffs = len + (pageoffs * mtd->oobsize); |
709 | ||
1da177e4 LT |
710 | } else { |
711 | /* Calc length */ | |
712 | len = (size_t) (numblocks >> sft); | |
713 | /* Make it page aligned ! */ | |
9223a456 TG |
714 | len = (len + (mtd->writesize - 1)) & |
715 | ~(mtd->writesize - 1); | |
1da177e4 | 716 | /* Preset the buffer with 0xff */ |
9223a456 TG |
717 | memset(buf, 0xff, len + |
718 | (len >> this->page_shift)* mtd->oobsize); | |
1da177e4 | 719 | offs = 0; |
9223a456 | 720 | ooboffs = len; |
1da177e4 | 721 | /* Pattern is located in oob area of first page */ |
9223a456 | 722 | memcpy(&buf[ooboffs + td->offs], td->pattern, td->len); |
1da177e4 | 723 | } |
61b03bd7 | 724 | |
9223a456 TG |
725 | if (td->options & NAND_BBT_VERSION) |
726 | buf[ooboffs + td->veroffs] = td->version[chip]; | |
727 | ||
1da177e4 | 728 | /* walk through the memory table */ |
e0c7d767 | 729 | for (i = 0; i < numblocks;) { |
1da177e4 LT |
730 | uint8_t dat; |
731 | dat = this->bbt[bbtoffs + (i >> 2)]; | |
e0c7d767 | 732 | for (j = 0; j < 4; j++, i++) { |
1da177e4 LT |
733 | int sftcnt = (i << (3 - sft)) & sftmsk; |
734 | /* Do not store the reserved bbt blocks ! */ | |
9223a456 TG |
735 | buf[offs + (i >> sft)] &= |
736 | ~(msk[dat & 0x03] << sftcnt); | |
1da177e4 LT |
737 | dat >>= 2; |
738 | } | |
739 | } | |
61b03bd7 | 740 | |
e0c7d767 | 741 | memset(&einfo, 0, sizeof(einfo)); |
1da177e4 | 742 | einfo.mtd = mtd; |
69423d99 | 743 | einfo.addr = to; |
1da177e4 | 744 | einfo.len = 1 << this->bbt_erase_shift; |
e0c7d767 | 745 | res = nand_erase_nand(mtd, &einfo, 1); |
9223a456 TG |
746 | if (res < 0) |
747 | goto outerr; | |
61b03bd7 | 748 | |
8593fbc6 | 749 | res = scan_write_bbt(mtd, to, len, buf, &buf[len]); |
9223a456 TG |
750 | if (res < 0) |
751 | goto outerr; | |
752 | ||
69423d99 AH |
753 | printk(KERN_DEBUG "Bad block table written to 0x%012llx, version " |
754 | "0x%02X\n", (unsigned long long)to, td->version[chip]); | |
61b03bd7 | 755 | |
1da177e4 LT |
756 | /* Mark it as used */ |
757 | td->pages[chip] = page; | |
61b03bd7 | 758 | } |
1da177e4 | 759 | return 0; |
9223a456 TG |
760 | |
761 | outerr: | |
762 | printk(KERN_WARNING | |
763 | "nand_bbt: Error while writing bad block table %d\n", res); | |
764 | return res; | |
1da177e4 LT |
765 | } |
766 | ||
767 | /** | |
768 | * nand_memory_bbt - [GENERIC] create a memory based bad block table | |
769 | * @mtd: MTD device structure | |
770 | * @bd: descriptor for the good/bad block search pattern | |
771 | * | |
61b03bd7 | 772 | * The function creates a memory based bbt by scanning the device |
1da177e4 LT |
773 | * for manufacturer / software marked good / bad blocks |
774 | */ | |
e0c7d767 | 775 | static inline int nand_memory_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd) |
1da177e4 LT |
776 | { |
777 | struct nand_chip *this = mtd->priv; | |
778 | ||
171650af | 779 | bd->options &= ~NAND_BBT_SCANEMPTY; |
4bf63fcb | 780 | return create_bbt(mtd, this->buffers->databuf, bd, -1); |
1da177e4 LT |
781 | } |
782 | ||
783 | /** | |
e0c7d767 | 784 | * check_create - [GENERIC] create and write bbt(s) if necessary |
1da177e4 LT |
785 | * @mtd: MTD device structure |
786 | * @buf: temporary buffer | |
787 | * @bd: descriptor for the good/bad block search pattern | |
788 | * | |
789 | * The function checks the results of the previous call to read_bbt | |
e0c7d767 DW |
790 | * and creates / updates the bbt(s) if necessary |
791 | * Creation is necessary if no bbt was found for the chip/device | |
792 | * Update is necessary if one of the tables is missing or the | |
1da177e4 LT |
793 | * version nr. of one table is less than the other |
794 | */ | |
e0c7d767 | 795 | static int check_create(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *bd) |
1da177e4 LT |
796 | { |
797 | int i, chips, writeops, chipsel, res; | |
798 | struct nand_chip *this = mtd->priv; | |
799 | struct nand_bbt_descr *td = this->bbt_td; | |
800 | struct nand_bbt_descr *md = this->bbt_md; | |
801 | struct nand_bbt_descr *rd, *rd2; | |
802 | ||
803 | /* Do we have a bbt per chip ? */ | |
61b03bd7 | 804 | if (td->options & NAND_BBT_PERCHIP) |
1da177e4 | 805 | chips = this->numchips; |
61b03bd7 | 806 | else |
1da177e4 | 807 | chips = 1; |
61b03bd7 | 808 | |
1da177e4 LT |
809 | for (i = 0; i < chips; i++) { |
810 | writeops = 0; | |
811 | rd = NULL; | |
812 | rd2 = NULL; | |
813 | /* Per chip or per device ? */ | |
814 | chipsel = (td->options & NAND_BBT_PERCHIP) ? i : -1; | |
815 | /* Mirrored table avilable ? */ | |
816 | if (md) { | |
817 | if (td->pages[i] == -1 && md->pages[i] == -1) { | |
818 | writeops = 0x03; | |
819 | goto create; | |
820 | } | |
821 | ||
822 | if (td->pages[i] == -1) { | |
61b03bd7 | 823 | rd = md; |
1da177e4 LT |
824 | td->version[i] = md->version[i]; |
825 | writeops = 1; | |
826 | goto writecheck; | |
827 | } | |
828 | ||
829 | if (md->pages[i] == -1) { | |
830 | rd = td; | |
831 | md->version[i] = td->version[i]; | |
832 | writeops = 2; | |
833 | goto writecheck; | |
834 | } | |
835 | ||
836 | if (td->version[i] == md->version[i]) { | |
837 | rd = td; | |
838 | if (!(td->options & NAND_BBT_VERSION)) | |
839 | rd2 = md; | |
840 | goto writecheck; | |
61b03bd7 | 841 | } |
1da177e4 LT |
842 | |
843 | if (((int8_t) (td->version[i] - md->version[i])) > 0) { | |
844 | rd = td; | |
845 | md->version[i] = td->version[i]; | |
846 | writeops = 2; | |
847 | } else { | |
848 | rd = md; | |
849 | td->version[i] = md->version[i]; | |
850 | writeops = 1; | |
851 | } | |
852 | ||
853 | goto writecheck; | |
854 | ||
855 | } else { | |
856 | if (td->pages[i] == -1) { | |
857 | writeops = 0x01; | |
858 | goto create; | |
859 | } | |
860 | rd = td; | |
861 | goto writecheck; | |
862 | } | |
e0c7d767 | 863 | create: |
1da177e4 LT |
864 | /* Create the bad block table by scanning the device ? */ |
865 | if (!(td->options & NAND_BBT_CREATE)) | |
61b03bd7 TG |
866 | continue; |
867 | ||
1da177e4 | 868 | /* Create the table in memory by scanning the chip(s) */ |
e0c7d767 | 869 | create_bbt(mtd, buf, bd, chipsel); |
61b03bd7 | 870 | |
1da177e4 LT |
871 | td->version[i] = 1; |
872 | if (md) | |
61b03bd7 | 873 | md->version[i] = 1; |
e0c7d767 | 874 | writecheck: |
1da177e4 LT |
875 | /* read back first ? */ |
876 | if (rd) | |
e0c7d767 | 877 | read_abs_bbt(mtd, buf, rd, chipsel); |
1da177e4 LT |
878 | /* If they weren't versioned, read both. */ |
879 | if (rd2) | |
e0c7d767 | 880 | read_abs_bbt(mtd, buf, rd2, chipsel); |
1da177e4 LT |
881 | |
882 | /* Write the bad block table to the device ? */ | |
883 | if ((writeops & 0x01) && (td->options & NAND_BBT_WRITE)) { | |
e0c7d767 | 884 | res = write_bbt(mtd, buf, td, md, chipsel); |
1da177e4 LT |
885 | if (res < 0) |
886 | return res; | |
887 | } | |
61b03bd7 | 888 | |
1da177e4 LT |
889 | /* Write the mirror bad block table to the device ? */ |
890 | if ((writeops & 0x02) && md && (md->options & NAND_BBT_WRITE)) { | |
e0c7d767 | 891 | res = write_bbt(mtd, buf, md, td, chipsel); |
1da177e4 LT |
892 | if (res < 0) |
893 | return res; | |
894 | } | |
895 | } | |
61b03bd7 | 896 | return 0; |
1da177e4 LT |
897 | } |
898 | ||
899 | /** | |
61b03bd7 | 900 | * mark_bbt_regions - [GENERIC] mark the bad block table regions |
1da177e4 LT |
901 | * @mtd: MTD device structure |
902 | * @td: bad block table descriptor | |
903 | * | |
904 | * The bad block table regions are marked as "bad" to prevent | |
905 | * accidental erasures / writes. The regions are identified by | |
906 | * the mark 0x02. | |
907 | */ | |
e0c7d767 | 908 | static void mark_bbt_region(struct mtd_info *mtd, struct nand_bbt_descr *td) |
1da177e4 LT |
909 | { |
910 | struct nand_chip *this = mtd->priv; | |
911 | int i, j, chips, block, nrblocks, update; | |
912 | uint8_t oldval, newval; | |
913 | ||
914 | /* Do we have a bbt per chip ? */ | |
915 | if (td->options & NAND_BBT_PERCHIP) { | |
916 | chips = this->numchips; | |
917 | nrblocks = (int)(this->chipsize >> this->bbt_erase_shift); | |
918 | } else { | |
919 | chips = 1; | |
920 | nrblocks = (int)(mtd->size >> this->bbt_erase_shift); | |
61b03bd7 TG |
921 | } |
922 | ||
1da177e4 LT |
923 | for (i = 0; i < chips; i++) { |
924 | if ((td->options & NAND_BBT_ABSPAGE) || | |
925 | !(td->options & NAND_BBT_WRITE)) { | |
e0c7d767 DW |
926 | if (td->pages[i] == -1) |
927 | continue; | |
1da177e4 | 928 | block = td->pages[i] >> (this->bbt_erase_shift - this->page_shift); |
61b03bd7 | 929 | block <<= 1; |
1da177e4 LT |
930 | oldval = this->bbt[(block >> 3)]; |
931 | newval = oldval | (0x2 << (block & 0x06)); | |
932 | this->bbt[(block >> 3)] = newval; | |
933 | if ((oldval != newval) && td->reserved_block_code) | |
69423d99 | 934 | nand_update_bbt(mtd, (loff_t)block << (this->bbt_erase_shift - 1)); |
1da177e4 LT |
935 | continue; |
936 | } | |
937 | update = 0; | |
938 | if (td->options & NAND_BBT_LASTBLOCK) | |
939 | block = ((i + 1) * nrblocks) - td->maxblocks; | |
61b03bd7 | 940 | else |
1da177e4 | 941 | block = i * nrblocks; |
61b03bd7 | 942 | block <<= 1; |
1da177e4 LT |
943 | for (j = 0; j < td->maxblocks; j++) { |
944 | oldval = this->bbt[(block >> 3)]; | |
945 | newval = oldval | (0x2 << (block & 0x06)); | |
946 | this->bbt[(block >> 3)] = newval; | |
e0c7d767 DW |
947 | if (oldval != newval) |
948 | update = 1; | |
1da177e4 | 949 | block += 2; |
61b03bd7 | 950 | } |
1da177e4 LT |
951 | /* If we want reserved blocks to be recorded to flash, and some |
952 | new ones have been marked, then we need to update the stored | |
953 | bbts. This should only happen once. */ | |
954 | if (update && td->reserved_block_code) | |
69423d99 | 955 | nand_update_bbt(mtd, (loff_t)(block - 2) << (this->bbt_erase_shift - 1)); |
1da177e4 LT |
956 | } |
957 | } | |
958 | ||
959 | /** | |
960 | * nand_scan_bbt - [NAND Interface] scan, find, read and maybe create bad block table(s) | |
961 | * @mtd: MTD device structure | |
962 | * @bd: descriptor for the good/bad block search pattern | |
963 | * | |
61b03bd7 | 964 | * The function checks, if a bad block table(s) is/are already |
1da177e4 LT |
965 | * available. If not it scans the device for manufacturer |
966 | * marked good / bad blocks and writes the bad block table(s) to | |
967 | * the selected place. | |
968 | * | |
969 | * The bad block table memory is allocated here. It must be freed | |
970 | * by calling the nand_free_bbt function. | |
971 | * | |
972 | */ | |
e0c7d767 | 973 | int nand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd) |
1da177e4 LT |
974 | { |
975 | struct nand_chip *this = mtd->priv; | |
976 | int len, res = 0; | |
977 | uint8_t *buf; | |
978 | struct nand_bbt_descr *td = this->bbt_td; | |
979 | struct nand_bbt_descr *md = this->bbt_md; | |
980 | ||
981 | len = mtd->size >> (this->bbt_erase_shift + 2); | |
95b93a0c BY |
982 | /* Allocate memory (2bit per block) and clear the memory bad block table */ |
983 | this->bbt = kzalloc(len, GFP_KERNEL); | |
1da177e4 | 984 | if (!this->bbt) { |
e0c7d767 | 985 | printk(KERN_ERR "nand_scan_bbt: Out of memory\n"); |
1da177e4 LT |
986 | return -ENOMEM; |
987 | } | |
1da177e4 LT |
988 | |
989 | /* If no primary table decriptor is given, scan the device | |
990 | * to build a memory based bad block table | |
991 | */ | |
eeada24d AB |
992 | if (!td) { |
993 | if ((res = nand_memory_bbt(mtd, bd))) { | |
e0c7d767 DW |
994 | printk(KERN_ERR "nand_bbt: Can't scan flash and build the RAM-based BBT\n"); |
995 | kfree(this->bbt); | |
eeada24d AB |
996 | this->bbt = NULL; |
997 | } | |
998 | return res; | |
999 | } | |
1da177e4 LT |
1000 | |
1001 | /* Allocate a temporary buffer for one eraseblock incl. oob */ | |
1002 | len = (1 << this->bbt_erase_shift); | |
1003 | len += (len >> this->page_shift) * mtd->oobsize; | |
c3f8abf4 | 1004 | buf = vmalloc(len); |
1da177e4 | 1005 | if (!buf) { |
e0c7d767 DW |
1006 | printk(KERN_ERR "nand_bbt: Out of memory\n"); |
1007 | kfree(this->bbt); | |
1da177e4 LT |
1008 | this->bbt = NULL; |
1009 | return -ENOMEM; | |
1010 | } | |
61b03bd7 | 1011 | |
1da177e4 LT |
1012 | /* Is the bbt at a given page ? */ |
1013 | if (td->options & NAND_BBT_ABSPAGE) { | |
e0c7d767 | 1014 | res = read_abs_bbts(mtd, buf, td, md); |
61b03bd7 | 1015 | } else { |
1da177e4 | 1016 | /* Search the bad block table using a pattern in oob */ |
e0c7d767 | 1017 | res = search_read_bbts(mtd, buf, td, md); |
61b03bd7 | 1018 | } |
1da177e4 | 1019 | |
61b03bd7 | 1020 | if (res) |
e0c7d767 | 1021 | res = check_create(mtd, buf, bd); |
61b03bd7 | 1022 | |
1da177e4 | 1023 | /* Prevent the bbt regions from erasing / writing */ |
e0c7d767 | 1024 | mark_bbt_region(mtd, td); |
1da177e4 | 1025 | if (md) |
e0c7d767 | 1026 | mark_bbt_region(mtd, md); |
61b03bd7 | 1027 | |
e0c7d767 | 1028 | vfree(buf); |
1da177e4 LT |
1029 | return res; |
1030 | } | |
1031 | ||
1da177e4 | 1032 | /** |
61b03bd7 | 1033 | * nand_update_bbt - [NAND Interface] update bad block table(s) |
1da177e4 LT |
1034 | * @mtd: MTD device structure |
1035 | * @offs: the offset of the newly marked block | |
1036 | * | |
1037 | * The function updates the bad block table(s) | |
1038 | */ | |
e0c7d767 | 1039 | int nand_update_bbt(struct mtd_info *mtd, loff_t offs) |
1da177e4 LT |
1040 | { |
1041 | struct nand_chip *this = mtd->priv; | |
1042 | int len, res = 0, writeops = 0; | |
1043 | int chip, chipsel; | |
1044 | uint8_t *buf; | |
1045 | struct nand_bbt_descr *td = this->bbt_td; | |
1046 | struct nand_bbt_descr *md = this->bbt_md; | |
1047 | ||
1048 | if (!this->bbt || !td) | |
1049 | return -EINVAL; | |
1050 | ||
1da177e4 LT |
1051 | /* Allocate a temporary buffer for one eraseblock incl. oob */ |
1052 | len = (1 << this->bbt_erase_shift); | |
1053 | len += (len >> this->page_shift) * mtd->oobsize; | |
e0c7d767 | 1054 | buf = kmalloc(len, GFP_KERNEL); |
1da177e4 | 1055 | if (!buf) { |
e0c7d767 | 1056 | printk(KERN_ERR "nand_update_bbt: Out of memory\n"); |
1da177e4 LT |
1057 | return -ENOMEM; |
1058 | } | |
61b03bd7 | 1059 | |
1da177e4 LT |
1060 | writeops = md != NULL ? 0x03 : 0x01; |
1061 | ||
1062 | /* Do we have a bbt per chip ? */ | |
1063 | if (td->options & NAND_BBT_PERCHIP) { | |
e0c7d767 | 1064 | chip = (int)(offs >> this->chip_shift); |
1da177e4 LT |
1065 | chipsel = chip; |
1066 | } else { | |
1067 | chip = 0; | |
1068 | chipsel = -1; | |
1069 | } | |
1070 | ||
1071 | td->version[chip]++; | |
1072 | if (md) | |
61b03bd7 | 1073 | md->version[chip]++; |
1da177e4 LT |
1074 | |
1075 | /* Write the bad block table to the device ? */ | |
1076 | if ((writeops & 0x01) && (td->options & NAND_BBT_WRITE)) { | |
e0c7d767 | 1077 | res = write_bbt(mtd, buf, td, md, chipsel); |
1da177e4 LT |
1078 | if (res < 0) |
1079 | goto out; | |
1080 | } | |
1081 | /* Write the mirror bad block table to the device ? */ | |
1082 | if ((writeops & 0x02) && md && (md->options & NAND_BBT_WRITE)) { | |
e0c7d767 | 1083 | res = write_bbt(mtd, buf, md, td, chipsel); |
1da177e4 LT |
1084 | } |
1085 | ||
e0c7d767 DW |
1086 | out: |
1087 | kfree(buf); | |
1da177e4 LT |
1088 | return res; |
1089 | } | |
1090 | ||
61b03bd7 | 1091 | /* Define some generic bad / good block scan pattern which are used |
171650af | 1092 | * while scanning a device for factory marked good / bad blocks. */ |
1da177e4 LT |
1093 | static uint8_t scan_ff_pattern[] = { 0xff, 0xff }; |
1094 | ||
1095 | static struct nand_bbt_descr smallpage_memorybased = { | |
c7b28e25 BN |
1096 | .options = 0, |
1097 | .offs = NAND_SMALL_BADBLOCK_POS, | |
1da177e4 LT |
1098 | .len = 1, |
1099 | .pattern = scan_ff_pattern | |
1100 | }; | |
1101 | ||
c7b28e25 BN |
1102 | static struct nand_bbt_descr smallpage_scan2nd_memorybased = { |
1103 | .options = NAND_BBT_SCAN2NDPAGE, | |
1104 | .offs = NAND_SMALL_BADBLOCK_POS, | |
1105 | .len = 2, | |
1106 | .pattern = scan_ff_pattern | |
1107 | }; | |
1108 | ||
1da177e4 LT |
1109 | static struct nand_bbt_descr largepage_memorybased = { |
1110 | .options = 0, | |
c7b28e25 BN |
1111 | .offs = NAND_LARGE_BADBLOCK_POS, |
1112 | .len = 1, | |
1113 | .pattern = scan_ff_pattern | |
1114 | }; | |
1115 | ||
1116 | static struct nand_bbt_descr largepage_scan2nd_memorybased = { | |
1117 | .options = NAND_BBT_SCAN2NDPAGE, | |
1118 | .offs = NAND_LARGE_BADBLOCK_POS, | |
1da177e4 LT |
1119 | .len = 2, |
1120 | .pattern = scan_ff_pattern | |
1121 | }; | |
1122 | ||
c7b28e25 BN |
1123 | static struct nand_bbt_descr lastpage_memorybased = { |
1124 | .options = NAND_BBT_SCANLASTPAGE, | |
1125 | .offs = 0, | |
1126 | .len = 1, | |
1127 | .pattern = scan_ff_pattern | |
1128 | }; | |
1129 | ||
1da177e4 | 1130 | static struct nand_bbt_descr smallpage_flashbased = { |
6943f8af | 1131 | .options = NAND_BBT_SCAN2NDPAGE, |
c7b28e25 | 1132 | .offs = NAND_SMALL_BADBLOCK_POS, |
1da177e4 LT |
1133 | .len = 1, |
1134 | .pattern = scan_ff_pattern | |
1135 | }; | |
1136 | ||
1137 | static struct nand_bbt_descr largepage_flashbased = { | |
6943f8af | 1138 | .options = NAND_BBT_SCAN2NDPAGE, |
c7b28e25 | 1139 | .offs = NAND_LARGE_BADBLOCK_POS, |
1da177e4 LT |
1140 | .len = 2, |
1141 | .pattern = scan_ff_pattern | |
1142 | }; | |
1143 | ||
1144 | static uint8_t scan_agand_pattern[] = { 0x1C, 0x71, 0xC7, 0x1C, 0x71, 0xC7 }; | |
1145 | ||
1146 | static struct nand_bbt_descr agand_flashbased = { | |
1147 | .options = NAND_BBT_SCANEMPTY | NAND_BBT_SCANALLPAGES, | |
1148 | .offs = 0x20, | |
1149 | .len = 6, | |
1150 | .pattern = scan_agand_pattern | |
1151 | }; | |
1152 | ||
1153 | /* Generic flash bbt decriptors | |
1154 | */ | |
1155 | static uint8_t bbt_pattern[] = {'B', 'b', 't', '0' }; | |
1156 | static uint8_t mirror_pattern[] = {'1', 't', 'b', 'B' }; | |
1157 | ||
1158 | static struct nand_bbt_descr bbt_main_descr = { | |
61b03bd7 | 1159 | .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
1da177e4 LT |
1160 | | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP, |
1161 | .offs = 8, | |
1162 | .len = 4, | |
1163 | .veroffs = 12, | |
1164 | .maxblocks = 4, | |
1165 | .pattern = bbt_pattern | |
1166 | }; | |
1167 | ||
1168 | static struct nand_bbt_descr bbt_mirror_descr = { | |
61b03bd7 | 1169 | .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
1da177e4 LT |
1170 | | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP, |
1171 | .offs = 8, | |
1172 | .len = 4, | |
1173 | .veroffs = 12, | |
1174 | .maxblocks = 4, | |
1175 | .pattern = mirror_pattern | |
1176 | }; | |
1177 | ||
1178 | /** | |
61b03bd7 | 1179 | * nand_default_bbt - [NAND Interface] Select a default bad block table for the device |
1da177e4 LT |
1180 | * @mtd: MTD device structure |
1181 | * | |
1182 | * This function selects the default bad block table | |
1183 | * support for the device and calls the nand_scan_bbt function | |
1184 | * | |
1185 | */ | |
e0c7d767 | 1186 | int nand_default_bbt(struct mtd_info *mtd) |
1da177e4 LT |
1187 | { |
1188 | struct nand_chip *this = mtd->priv; | |
61b03bd7 TG |
1189 | |
1190 | /* Default for AG-AND. We must use a flash based | |
1da177e4 LT |
1191 | * bad block table as the devices have factory marked |
1192 | * _good_ blocks. Erasing those blocks leads to loss | |
1193 | * of the good / bad information, so we _must_ store | |
61b03bd7 | 1194 | * this information in a good / bad table during |
1da177e4 | 1195 | * startup |
e0c7d767 | 1196 | */ |
1da177e4 LT |
1197 | if (this->options & NAND_IS_AND) { |
1198 | /* Use the default pattern descriptors */ | |
61b03bd7 | 1199 | if (!this->bbt_td) { |
1da177e4 LT |
1200 | this->bbt_td = &bbt_main_descr; |
1201 | this->bbt_md = &bbt_mirror_descr; | |
61b03bd7 | 1202 | } |
1da177e4 | 1203 | this->options |= NAND_USE_FLASH_BBT; |
e0c7d767 | 1204 | return nand_scan_bbt(mtd, &agand_flashbased); |
1da177e4 | 1205 | } |
61b03bd7 | 1206 | |
1da177e4 LT |
1207 | /* Is a flash based bad block table requested ? */ |
1208 | if (this->options & NAND_USE_FLASH_BBT) { | |
61b03bd7 TG |
1209 | /* Use the default pattern descriptors */ |
1210 | if (!this->bbt_td) { | |
1da177e4 LT |
1211 | this->bbt_td = &bbt_main_descr; |
1212 | this->bbt_md = &bbt_mirror_descr; | |
1213 | } | |
1214 | if (!this->badblock_pattern) { | |
28318776 | 1215 | this->badblock_pattern = (mtd->writesize > 512) ? &largepage_flashbased : &smallpage_flashbased; |
1da177e4 LT |
1216 | } |
1217 | } else { | |
1218 | this->bbt_td = NULL; | |
1219 | this->bbt_md = NULL; | |
1220 | if (!this->badblock_pattern) { | |
c7b28e25 BN |
1221 | if (this->options & NAND_BBT_SCANLASTPAGE) |
1222 | this->badblock_pattern = &lastpage_memorybased; | |
1223 | else if (this->options & NAND_BBT_SCAN2NDPAGE) | |
1224 | this->badblock_pattern = this->badblockpos == | |
1225 | NAND_SMALL_BADBLOCK_POS ? | |
1226 | &smallpage_scan2nd_memorybased : | |
1227 | &largepage_scan2nd_memorybased; | |
1228 | else | |
1229 | this->badblock_pattern = this->badblockpos == | |
1230 | NAND_SMALL_BADBLOCK_POS ? | |
1231 | &smallpage_memorybased : | |
1232 | &largepage_memorybased; | |
1da177e4 LT |
1233 | } |
1234 | } | |
e0c7d767 | 1235 | return nand_scan_bbt(mtd, this->badblock_pattern); |
1da177e4 LT |
1236 | } |
1237 | ||
1238 | /** | |
61b03bd7 | 1239 | * nand_isbad_bbt - [NAND Interface] Check if a block is bad |
1da177e4 LT |
1240 | * @mtd: MTD device structure |
1241 | * @offs: offset in the device | |
1242 | * @allowbbt: allow access to bad block table region | |
1243 | * | |
1244 | */ | |
e0c7d767 | 1245 | int nand_isbad_bbt(struct mtd_info *mtd, loff_t offs, int allowbbt) |
1da177e4 LT |
1246 | { |
1247 | struct nand_chip *this = mtd->priv; | |
1248 | int block; | |
e0c7d767 | 1249 | uint8_t res; |
61b03bd7 | 1250 | |
1da177e4 | 1251 | /* Get block number * 2 */ |
e0c7d767 | 1252 | block = (int)(offs >> (this->bbt_erase_shift - 1)); |
1da177e4 LT |
1253 | res = (this->bbt[block >> 3] >> (block & 0x06)) & 0x03; |
1254 | ||
e0c7d767 DW |
1255 | DEBUG(MTD_DEBUG_LEVEL2, "nand_isbad_bbt(): bbt info for offs 0x%08x: (block %d) 0x%02x\n", |
1256 | (unsigned int)offs, block >> 1, res); | |
1da177e4 LT |
1257 | |
1258 | switch ((int)res) { | |
e0c7d767 DW |
1259 | case 0x00: |
1260 | return 0; | |
1261 | case 0x01: | |
1262 | return 1; | |
1263 | case 0x02: | |
1264 | return allowbbt ? 0 : 1; | |
1da177e4 LT |
1265 | } |
1266 | return 1; | |
1267 | } | |
1268 | ||
e0c7d767 DW |
1269 | EXPORT_SYMBOL(nand_scan_bbt); |
1270 | EXPORT_SYMBOL(nand_default_bbt); |