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 | * | |
61b03bd7 | 9 | * $Id: nand_bbt.c,v 1.36 2005/11/07 11:14:30 gleixner Exp $ |
1da177e4 LT |
10 | * |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License version 2 as | |
13 | * published by the Free Software Foundation. | |
14 | * | |
15 | * Description: | |
16 | * | |
61b03bd7 TG |
17 | * When nand_scan_bbt is called, then it tries to find the bad block table |
18 | * depending on the options in the bbt descriptor(s). If a bbt is found | |
19 | * then the contents are read and the memory based bbt is created. If a | |
1da177e4 | 20 | * mirrored bbt is selected then the mirror is searched too and the |
61b03bd7 | 21 | * versions are compared. If the mirror has a greater version number |
1da177e4 LT |
22 | * than the mirror bbt is used to build the memory based bbt. |
23 | * If the tables are not versioned, then we "or" the bad block information. | |
61b03bd7 TG |
24 | * If one of the bbt's is out of date or does not exist it is (re)created. |
25 | * If no bbt exists at all then the device is scanned for factory marked | |
26 | * good / bad blocks and the bad block tables are created. | |
1da177e4 | 27 | * |
61b03bd7 | 28 | * For manufacturer created bbts like the one found on M-SYS DOC devices |
1da177e4 LT |
29 | * the bbt is searched and read but never created |
30 | * | |
61b03bd7 TG |
31 | * The autogenerated bad block table is located in the last good blocks |
32 | * of the device. The table is mirrored, so it can be updated eventually. | |
33 | * The table is marked in the oob area with an ident pattern and a version | |
1da177e4 LT |
34 | * number which indicates which of both tables is more up to date. |
35 | * | |
36 | * The table uses 2 bits per block | |
37 | * 11b: block is good | |
38 | * 00b: block is factory marked bad | |
39 | * 01b, 10b: block is marked bad due to wear | |
40 | * | |
41 | * The memory bad block table uses the following scheme: | |
42 | * 00b: block is good | |
43 | * 01b: block is marked bad due to wear | |
44 | * 10b: block is reserved (to protect the bbt area) | |
45 | * 11b: block is factory marked bad | |
61b03bd7 | 46 | * |
1da177e4 LT |
47 | * Multichip devices like DOC store the bad block info per floor. |
48 | * | |
49 | * Following assumptions are made: | |
50 | * - bbts start at a page boundary, if autolocated on a block boundary | |
51 | * - the space neccecary for a bbt in FLASH does not exceed a block boundary | |
61b03bd7 | 52 | * |
1da177e4 LT |
53 | */ |
54 | ||
55 | #include <linux/slab.h> | |
56 | #include <linux/types.h> | |
57 | #include <linux/mtd/mtd.h> | |
58 | #include <linux/mtd/nand.h> | |
59 | #include <linux/mtd/nand_ecc.h> | |
60 | #include <linux/mtd/compatmac.h> | |
61 | #include <linux/bitops.h> | |
62 | #include <linux/delay.h> | |
63 | ||
64 | ||
61b03bd7 | 65 | /** |
1da177e4 LT |
66 | * check_pattern - [GENERIC] check if a pattern is in the buffer |
67 | * @buf: the buffer to search | |
68 | * @len: the length of buffer to search | |
69 | * @paglen: the pagelength | |
70 | * @td: search pattern descriptor | |
71 | * | |
72 | * Check for a pattern at the given place. Used to search bad block | |
73 | * tables and good / bad block identifiers. | |
74 | * If the SCAN_EMPTY option is set then check, if all bytes except the | |
75 | * pattern area contain 0xff | |
76 | * | |
77 | */ | |
78 | static int check_pattern (uint8_t *buf, int len, int paglen, struct nand_bbt_descr *td) | |
79 | { | |
171650af | 80 | int i, end = 0; |
1da177e4 LT |
81 | uint8_t *p = buf; |
82 | ||
c9e05365 | 83 | end = paglen + td->offs; |
1da177e4 LT |
84 | if (td->options & NAND_BBT_SCANEMPTY) { |
85 | for (i = 0; i < end; i++) { | |
86 | if (p[i] != 0xff) | |
87 | return -1; | |
88 | } | |
61b03bd7 | 89 | } |
c9e05365 | 90 | p += end; |
61b03bd7 | 91 | |
1da177e4 LT |
92 | /* Compare the pattern */ |
93 | for (i = 0; i < td->len; i++) { | |
94 | if (p[i] != td->pattern[i]) | |
95 | return -1; | |
96 | } | |
97 | ||
1da177e4 | 98 | if (td->options & NAND_BBT_SCANEMPTY) { |
171650af AB |
99 | p += td->len; |
100 | end += td->len; | |
1da177e4 LT |
101 | for (i = end; i < len; i++) { |
102 | if (*p++ != 0xff) | |
103 | return -1; | |
104 | } | |
105 | } | |
106 | return 0; | |
107 | } | |
108 | ||
61b03bd7 | 109 | /** |
c9e05365 TG |
110 | * check_short_pattern - [GENERIC] check if a pattern is in the buffer |
111 | * @buf: the buffer to search | |
c9e05365 TG |
112 | * @td: search pattern descriptor |
113 | * | |
114 | * Check for a pattern at the given place. Used to search bad block | |
61b03bd7 | 115 | * tables and good / bad block identifiers. Same as check_pattern, but |
19870da7 | 116 | * no optional empty check |
c9e05365 TG |
117 | * |
118 | */ | |
19870da7 | 119 | static int check_short_pattern (uint8_t *buf, struct nand_bbt_descr *td) |
c9e05365 TG |
120 | { |
121 | int i; | |
122 | uint8_t *p = buf; | |
123 | ||
124 | /* Compare the pattern */ | |
125 | for (i = 0; i < td->len; i++) { | |
19870da7 | 126 | if (p[td->offs + i] != td->pattern[i]) |
c9e05365 TG |
127 | return -1; |
128 | } | |
129 | return 0; | |
130 | } | |
131 | ||
1da177e4 LT |
132 | /** |
133 | * read_bbt - [GENERIC] Read the bad block table starting from page | |
134 | * @mtd: MTD device structure | |
135 | * @buf: temporary buffer | |
136 | * @page: the starting page | |
137 | * @num: the number of bbt descriptors to read | |
138 | * @bits: number of bits per block | |
139 | * @offs: offset in the memory table | |
140 | * @reserved_block_code: Pattern to identify reserved blocks | |
141 | * | |
142 | * Read the bad block table starting from page. | |
143 | * | |
144 | */ | |
61b03bd7 | 145 | static int read_bbt (struct mtd_info *mtd, uint8_t *buf, int page, int num, |
1da177e4 LT |
146 | int bits, int offs, int reserved_block_code) |
147 | { | |
148 | int res, i, j, act = 0; | |
149 | struct nand_chip *this = mtd->priv; | |
150 | size_t retlen, len, totlen; | |
151 | loff_t from; | |
152 | uint8_t msk = (uint8_t) ((1 << bits) - 1); | |
153 | ||
154 | totlen = (num * bits) >> 3; | |
155 | from = ((loff_t)page) << this->page_shift; | |
61b03bd7 | 156 | |
1da177e4 LT |
157 | while (totlen) { |
158 | len = min (totlen, (size_t) (1 << this->bbt_erase_shift)); | |
159 | res = mtd->read_ecc (mtd, from, len, &retlen, buf, NULL, this->autooob); | |
160 | if (res < 0) { | |
161 | if (retlen != len) { | |
162 | printk (KERN_INFO "nand_bbt: Error reading bad block table\n"); | |
163 | return res; | |
164 | } | |
165 | printk (KERN_WARNING "nand_bbt: ECC error while reading bad block table\n"); | |
61b03bd7 | 166 | } |
1da177e4 LT |
167 | |
168 | /* Analyse data */ | |
169 | for (i = 0; i < len; i++) { | |
170 | uint8_t dat = buf[i]; | |
171 | for (j = 0; j < 8; j += bits, act += 2) { | |
172 | uint8_t tmp = (dat >> j) & msk; | |
173 | if (tmp == msk) | |
174 | continue; | |
175 | if (reserved_block_code && | |
176 | (tmp == reserved_block_code)) { | |
177 | printk (KERN_DEBUG "nand_read_bbt: Reserved block at 0x%08x\n", | |
178 | ((offs << 2) + (act >> 1)) << this->bbt_erase_shift); | |
179 | this->bbt[offs + (act >> 3)] |= 0x2 << (act & 0x06); | |
180 | continue; | |
181 | } | |
182 | /* Leave it for now, if its matured we can move this | |
183 | * message to MTD_DEBUG_LEVEL0 */ | |
184 | printk (KERN_DEBUG "nand_read_bbt: Bad block at 0x%08x\n", | |
185 | ((offs << 2) + (act >> 1)) << this->bbt_erase_shift); | |
61b03bd7 | 186 | /* Factory marked bad or worn out ? */ |
1da177e4 LT |
187 | if (tmp == 0) |
188 | this->bbt[offs + (act >> 3)] |= 0x3 << (act & 0x06); | |
189 | else | |
190 | this->bbt[offs + (act >> 3)] |= 0x1 << (act & 0x06); | |
61b03bd7 | 191 | } |
1da177e4 LT |
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 | |
61b03bd7 | 203 | * @td: descriptor for the bad block table |
1da177e4 LT |
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 | */ | |
210 | static int read_abs_bbt (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td, int chip) | |
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 | ||
234 | /** | |
235 | * read_abs_bbts - [GENERIC] Read the bad block table(s) for all chips starting at a given page | |
236 | * @mtd: MTD device structure | |
237 | * @buf: temporary buffer | |
61b03bd7 | 238 | * @td: descriptor for the bad block table |
1da177e4 LT |
239 | * @md: descriptor for the bad block table mirror |
240 | * | |
241 | * Read the bad block table(s) for all chips starting at a given page | |
242 | * We assume that the bbt bits are in consecutive order. | |
243 | * | |
244 | */ | |
245 | static int read_abs_bbts (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td, | |
246 | struct nand_bbt_descr *md) | |
247 | { | |
248 | struct nand_chip *this = mtd->priv; | |
249 | ||
61b03bd7 | 250 | /* Read the primary version, if available */ |
1da177e4 | 251 | if (td->options & NAND_BBT_VERSION) { |
61b03bd7 | 252 | nand_read_raw (mtd, buf, td->pages[0] << this->page_shift, mtd->oobblock, mtd->oobsize); |
1da177e4 LT |
253 | td->version[0] = buf[mtd->oobblock + td->veroffs]; |
254 | printk (KERN_DEBUG "Bad block table at page %d, version 0x%02X\n", td->pages[0], td->version[0]); | |
255 | } | |
256 | ||
61b03bd7 | 257 | /* Read the mirror version, if available */ |
1da177e4 | 258 | if (md && (md->options & NAND_BBT_VERSION)) { |
61b03bd7 | 259 | nand_read_raw (mtd, buf, md->pages[0] << this->page_shift, mtd->oobblock, mtd->oobsize); |
1da177e4 LT |
260 | md->version[0] = buf[mtd->oobblock + md->veroffs]; |
261 | printk (KERN_DEBUG "Bad block table at page %d, version 0x%02X\n", md->pages[0], md->version[0]); | |
262 | } | |
263 | ||
264 | return 1; | |
265 | } | |
266 | ||
267 | /** | |
268 | * create_bbt - [GENERIC] Create a bad block table by scanning the device | |
269 | * @mtd: MTD device structure | |
270 | * @buf: temporary buffer | |
271 | * @bd: descriptor for the good/bad block search pattern | |
272 | * @chip: create the table for a specific chip, -1 read all chips. | |
273 | * Applies only if NAND_BBT_PERCHIP option is set | |
274 | * | |
275 | * Create a bad block table by scanning the device | |
276 | * for the given good/bad block identify pattern | |
277 | */ | |
eeada24d | 278 | static int create_bbt (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *bd, int chip) |
1da177e4 LT |
279 | { |
280 | struct nand_chip *this = mtd->priv; | |
171650af | 281 | int i, j, numblocks, len, scanlen; |
1da177e4 LT |
282 | int startblock; |
283 | loff_t from; | |
284 | size_t readlen, ooblen; | |
285 | ||
286 | printk (KERN_INFO "Scanning device for bad blocks\n"); | |
287 | ||
288 | if (bd->options & NAND_BBT_SCANALLPAGES) | |
289 | len = 1 << (this->bbt_erase_shift - this->page_shift); | |
290 | else { | |
291 | if (bd->options & NAND_BBT_SCAN2NDPAGE) | |
292 | len = 2; | |
61b03bd7 | 293 | else |
1da177e4 LT |
294 | len = 1; |
295 | } | |
171650af AB |
296 | |
297 | if (!(bd->options & NAND_BBT_SCANEMPTY)) { | |
298 | /* We need only read few bytes from the OOB area */ | |
299 | scanlen = ooblen = 0; | |
eeada24d AB |
300 | readlen = bd->len; |
301 | } else { | |
171650af | 302 | /* Full page content should be read */ |
eeada24d AB |
303 | scanlen = mtd->oobblock + mtd->oobsize; |
304 | readlen = len * mtd->oobblock; | |
305 | ooblen = len * mtd->oobsize; | |
eeada24d | 306 | } |
1da177e4 LT |
307 | |
308 | if (chip == -1) { | |
309 | /* Note that numblocks is 2 * (real numblocks) here, see i+=2 below as it | |
310 | * makes shifting and masking less painful */ | |
311 | numblocks = mtd->size >> (this->bbt_erase_shift - 1); | |
312 | startblock = 0; | |
313 | from = 0; | |
314 | } else { | |
315 | if (chip >= this->numchips) { | |
316 | printk (KERN_WARNING "create_bbt(): chipnr (%d) > available chips (%d)\n", | |
317 | chip + 1, this->numchips); | |
171650af | 318 | return -EINVAL; |
1da177e4 LT |
319 | } |
320 | numblocks = this->chipsize >> (this->bbt_erase_shift - 1); | |
321 | startblock = chip * numblocks; | |
322 | numblocks += startblock; | |
323 | from = startblock << (this->bbt_erase_shift - 1); | |
324 | } | |
61b03bd7 | 325 | |
1da177e4 | 326 | for (i = startblock; i < numblocks;) { |
eeada24d | 327 | int ret; |
61b03bd7 | 328 | |
171650af | 329 | if (bd->options & NAND_BBT_SCANEMPTY) |
eeada24d AB |
330 | if ((ret = nand_read_raw (mtd, buf, from, readlen, ooblen))) |
331 | return ret; | |
171650af | 332 | |
1da177e4 | 333 | for (j = 0; j < len; j++) { |
171650af AB |
334 | if (!(bd->options & NAND_BBT_SCANEMPTY)) { |
335 | size_t retlen; | |
61b03bd7 TG |
336 | |
337 | /* Read the full oob until read_oob is fixed to | |
19870da7 TG |
338 | * handle single byte reads for 16 bit buswidth */ |
339 | ret = mtd->read_oob(mtd, from + j * mtd->oobblock, | |
340 | mtd->oobsize, &retlen, buf); | |
171650af AB |
341 | if (ret) |
342 | return ret; | |
c9e05365 | 343 | |
19870da7 | 344 | if (check_short_pattern (buf, bd)) { |
c9e05365 | 345 | this->bbt[i >> 3] |= 0x03 << (i & 0x6); |
61b03bd7 | 346 | printk (KERN_WARNING "Bad eraseblock %d at 0x%08x\n", |
c9e05365 TG |
347 | i >> 1, (unsigned int) from); |
348 | break; | |
349 | } | |
350 | } else { | |
351 | if (check_pattern (&buf[j * scanlen], scanlen, mtd->oobblock, bd)) { | |
352 | this->bbt[i >> 3] |= 0x03 << (i & 0x6); | |
61b03bd7 | 353 | printk (KERN_WARNING "Bad eraseblock %d at 0x%08x\n", |
c9e05365 TG |
354 | i >> 1, (unsigned int) from); |
355 | break; | |
356 | } | |
1da177e4 LT |
357 | } |
358 | } | |
359 | i += 2; | |
360 | from += (1 << this->bbt_erase_shift); | |
361 | } | |
eeada24d | 362 | return 0; |
1da177e4 LT |
363 | } |
364 | ||
365 | /** | |
366 | * search_bbt - [GENERIC] scan the device for a specific bad block table | |
367 | * @mtd: MTD device structure | |
368 | * @buf: temporary buffer | |
369 | * @td: descriptor for the bad block table | |
370 | * | |
371 | * Read the bad block table by searching for a given ident pattern. | |
61b03bd7 | 372 | * Search is preformed either from the beginning up or from the end of |
1da177e4 LT |
373 | * the device downwards. The search starts always at the start of a |
374 | * block. | |
61b03bd7 | 375 | * If the option NAND_BBT_PERCHIP is given, each chip is searched |
1da177e4 LT |
376 | * for a bbt, which contains the bad block information of this chip. |
377 | * This is neccecary to provide support for certain DOC devices. | |
378 | * | |
61b03bd7 TG |
379 | * The bbt ident pattern resides in the oob area of the first page |
380 | * in a block. | |
1da177e4 LT |
381 | */ |
382 | static int search_bbt (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td) | |
383 | { | |
384 | struct nand_chip *this = mtd->priv; | |
385 | int i, chips; | |
386 | int bits, startblock, block, dir; | |
387 | int scanlen = mtd->oobblock + mtd->oobsize; | |
388 | int bbtblocks; | |
389 | ||
390 | /* Search direction top -> down ? */ | |
391 | if (td->options & NAND_BBT_LASTBLOCK) { | |
392 | startblock = (mtd->size >> this->bbt_erase_shift) -1; | |
393 | dir = -1; | |
394 | } else { | |
61b03bd7 | 395 | startblock = 0; |
1da177e4 | 396 | dir = 1; |
61b03bd7 TG |
397 | } |
398 | ||
1da177e4 LT |
399 | /* Do we have a bbt per chip ? */ |
400 | if (td->options & NAND_BBT_PERCHIP) { | |
401 | chips = this->numchips; | |
402 | bbtblocks = this->chipsize >> this->bbt_erase_shift; | |
403 | startblock &= bbtblocks - 1; | |
404 | } else { | |
405 | chips = 1; | |
406 | bbtblocks = mtd->size >> this->bbt_erase_shift; | |
407 | } | |
61b03bd7 | 408 | |
1da177e4 LT |
409 | /* Number of bits for each erase block in the bbt */ |
410 | bits = td->options & NAND_BBT_NRBITS_MSK; | |
61b03bd7 | 411 | |
1da177e4 LT |
412 | for (i = 0; i < chips; i++) { |
413 | /* Reset version information */ | |
61b03bd7 | 414 | td->version[i] = 0; |
1da177e4 LT |
415 | td->pages[i] = -1; |
416 | /* Scan the maximum number of blocks */ | |
417 | for (block = 0; block < td->maxblocks; block++) { | |
418 | int actblock = startblock + dir * block; | |
419 | /* Read first page */ | |
61b03bd7 | 420 | nand_read_raw (mtd, buf, actblock << this->bbt_erase_shift, mtd->oobblock, mtd->oobsize); |
1da177e4 LT |
421 | if (!check_pattern(buf, scanlen, mtd->oobblock, td)) { |
422 | td->pages[i] = actblock << (this->bbt_erase_shift - this->page_shift); | |
423 | if (td->options & NAND_BBT_VERSION) { | |
424 | td->version[i] = buf[mtd->oobblock + td->veroffs]; | |
425 | } | |
426 | break; | |
427 | } | |
428 | } | |
429 | startblock += this->chipsize >> this->bbt_erase_shift; | |
430 | } | |
431 | /* Check, if we found a bbt for each requested chip */ | |
432 | for (i = 0; i < chips; i++) { | |
433 | if (td->pages[i] == -1) | |
434 | printk (KERN_WARNING "Bad block table not found for chip %d\n", i); | |
435 | else | |
436 | printk (KERN_DEBUG "Bad block table found at page %d, version 0x%02X\n", td->pages[i], td->version[i]); | |
437 | } | |
61b03bd7 | 438 | return 0; |
1da177e4 LT |
439 | } |
440 | ||
441 | /** | |
442 | * search_read_bbts - [GENERIC] scan the device for bad block table(s) | |
443 | * @mtd: MTD device structure | |
444 | * @buf: temporary buffer | |
61b03bd7 | 445 | * @td: descriptor for the bad block table |
1da177e4 LT |
446 | * @md: descriptor for the bad block table mirror |
447 | * | |
448 | * Search and read the bad block table(s) | |
449 | */ | |
61b03bd7 | 450 | static int search_read_bbts (struct mtd_info *mtd, uint8_t *buf, |
1da177e4 LT |
451 | struct nand_bbt_descr *td, struct nand_bbt_descr *md) |
452 | { | |
453 | /* Search the primary table */ | |
454 | search_bbt (mtd, buf, td); | |
61b03bd7 | 455 | |
1da177e4 LT |
456 | /* Search the mirror table */ |
457 | if (md) | |
458 | search_bbt (mtd, buf, md); | |
61b03bd7 | 459 | |
1da177e4 | 460 | /* Force result check */ |
61b03bd7 | 461 | return 1; |
1da177e4 | 462 | } |
1da177e4 | 463 | |
61b03bd7 TG |
464 | |
465 | /** | |
1da177e4 LT |
466 | * write_bbt - [GENERIC] (Re)write the bad block table |
467 | * | |
468 | * @mtd: MTD device structure | |
469 | * @buf: temporary buffer | |
61b03bd7 | 470 | * @td: descriptor for the bad block table |
1da177e4 LT |
471 | * @md: descriptor for the bad block table mirror |
472 | * @chipsel: selector for a specific chip, -1 for all | |
473 | * | |
474 | * (Re)write the bad block table | |
475 | * | |
476 | */ | |
61b03bd7 | 477 | static int write_bbt (struct mtd_info *mtd, uint8_t *buf, |
1da177e4 LT |
478 | struct nand_bbt_descr *td, struct nand_bbt_descr *md, int chipsel) |
479 | { | |
480 | struct nand_chip *this = mtd->priv; | |
481 | struct nand_oobinfo oobinfo; | |
482 | struct erase_info einfo; | |
483 | int i, j, res, chip = 0; | |
484 | int bits, startblock, dir, page, offs, numblocks, sft, sftmsk; | |
485 | int nrchips, bbtoffs, pageoffs; | |
486 | uint8_t msk[4]; | |
487 | uint8_t rcode = td->reserved_block_code; | |
488 | size_t retlen, len = 0; | |
489 | loff_t to; | |
490 | ||
491 | if (!rcode) | |
492 | rcode = 0xff; | |
493 | /* Write bad block table per chip rather than per device ? */ | |
494 | if (td->options & NAND_BBT_PERCHIP) { | |
495 | numblocks = (int) (this->chipsize >> this->bbt_erase_shift); | |
61b03bd7 | 496 | /* Full device write or specific chip ? */ |
1da177e4 LT |
497 | if (chipsel == -1) { |
498 | nrchips = this->numchips; | |
499 | } else { | |
500 | nrchips = chipsel + 1; | |
501 | chip = chipsel; | |
502 | } | |
503 | } else { | |
504 | numblocks = (int) (mtd->size >> this->bbt_erase_shift); | |
505 | nrchips = 1; | |
61b03bd7 TG |
506 | } |
507 | ||
1da177e4 LT |
508 | /* Loop through the chips */ |
509 | for (; chip < nrchips; chip++) { | |
61b03bd7 TG |
510 | |
511 | /* There was already a version of the table, reuse the page | |
512 | * This applies for absolute placement too, as we have the | |
1da177e4 LT |
513 | * page nr. in td->pages. |
514 | */ | |
515 | if (td->pages[chip] != -1) { | |
516 | page = td->pages[chip]; | |
517 | goto write; | |
61b03bd7 | 518 | } |
1da177e4 LT |
519 | |
520 | /* Automatic placement of the bad block table */ | |
521 | /* Search direction top -> down ? */ | |
522 | if (td->options & NAND_BBT_LASTBLOCK) { | |
523 | startblock = numblocks * (chip + 1) - 1; | |
524 | dir = -1; | |
525 | } else { | |
526 | startblock = chip * numblocks; | |
527 | dir = 1; | |
61b03bd7 | 528 | } |
1da177e4 LT |
529 | |
530 | for (i = 0; i < td->maxblocks; i++) { | |
531 | int block = startblock + dir * i; | |
532 | /* Check, if the block is bad */ | |
533 | switch ((this->bbt[block >> 2] >> (2 * (block & 0x03))) & 0x03) { | |
534 | case 0x01: | |
535 | case 0x03: | |
536 | continue; | |
537 | } | |
538 | page = block << (this->bbt_erase_shift - this->page_shift); | |
539 | /* Check, if the block is used by the mirror table */ | |
540 | if (!md || md->pages[chip] != page) | |
541 | goto write; | |
542 | } | |
543 | printk (KERN_ERR "No space left to write bad block table\n"); | |
544 | return -ENOSPC; | |
61b03bd7 | 545 | write: |
1da177e4 LT |
546 | |
547 | /* Set up shift count and masks for the flash table */ | |
548 | bits = td->options & NAND_BBT_NRBITS_MSK; | |
549 | switch (bits) { | |
550 | case 1: sft = 3; sftmsk = 0x07; msk[0] = 0x00; msk[1] = 0x01; msk[2] = ~rcode; msk[3] = 0x01; break; | |
551 | case 2: sft = 2; sftmsk = 0x06; msk[0] = 0x00; msk[1] = 0x01; msk[2] = ~rcode; msk[3] = 0x03; break; | |
552 | case 4: sft = 1; sftmsk = 0x04; msk[0] = 0x00; msk[1] = 0x0C; msk[2] = ~rcode; msk[3] = 0x0f; break; | |
553 | case 8: sft = 0; sftmsk = 0x00; msk[0] = 0x00; msk[1] = 0x0F; msk[2] = ~rcode; msk[3] = 0xff; break; | |
554 | default: return -EINVAL; | |
555 | } | |
61b03bd7 | 556 | |
1da177e4 | 557 | bbtoffs = chip * (numblocks >> 2); |
61b03bd7 | 558 | |
1da177e4 LT |
559 | to = ((loff_t) page) << this->page_shift; |
560 | ||
561 | memcpy (&oobinfo, this->autooob, sizeof(oobinfo)); | |
562 | oobinfo.useecc = MTD_NANDECC_PLACEONLY; | |
61b03bd7 | 563 | |
1da177e4 LT |
564 | /* Must we save the block contents ? */ |
565 | if (td->options & NAND_BBT_SAVECONTENT) { | |
566 | /* Make it block aligned */ | |
567 | to &= ~((loff_t) ((1 << this->bbt_erase_shift) - 1)); | |
568 | len = 1 << this->bbt_erase_shift; | |
569 | res = mtd->read_ecc (mtd, to, len, &retlen, buf, &buf[len], &oobinfo); | |
570 | if (res < 0) { | |
571 | if (retlen != len) { | |
572 | printk (KERN_INFO "nand_bbt: Error reading block for writing the bad block table\n"); | |
573 | return res; | |
574 | } | |
575 | printk (KERN_WARNING "nand_bbt: ECC error while reading block for writing bad block table\n"); | |
576 | } | |
577 | /* Calc the byte offset in the buffer */ | |
578 | pageoffs = page - (int)(to >> this->page_shift); | |
579 | offs = pageoffs << this->page_shift; | |
580 | /* Preset the bbt area with 0xff */ | |
581 | memset (&buf[offs], 0xff, (size_t)(numblocks >> sft)); | |
582 | /* Preset the bbt's oob area with 0xff */ | |
583 | memset (&buf[len + pageoffs * mtd->oobsize], 0xff, | |
584 | ((len >> this->page_shift) - pageoffs) * mtd->oobsize); | |
585 | if (td->options & NAND_BBT_VERSION) { | |
586 | buf[len + (pageoffs * mtd->oobsize) + td->veroffs] = td->version[chip]; | |
587 | } | |
588 | } else { | |
589 | /* Calc length */ | |
590 | len = (size_t) (numblocks >> sft); | |
591 | /* Make it page aligned ! */ | |
592 | len = (len + (mtd->oobblock-1)) & ~(mtd->oobblock-1); | |
593 | /* Preset the buffer with 0xff */ | |
594 | memset (buf, 0xff, len + (len >> this->page_shift) * mtd->oobsize); | |
595 | offs = 0; | |
596 | /* Pattern is located in oob area of first page */ | |
597 | memcpy (&buf[len + td->offs], td->pattern, td->len); | |
598 | if (td->options & NAND_BBT_VERSION) { | |
599 | buf[len + td->veroffs] = td->version[chip]; | |
600 | } | |
601 | } | |
61b03bd7 | 602 | |
1da177e4 LT |
603 | /* walk through the memory table */ |
604 | for (i = 0; i < numblocks; ) { | |
605 | uint8_t dat; | |
606 | dat = this->bbt[bbtoffs + (i >> 2)]; | |
607 | for (j = 0; j < 4; j++ , i++) { | |
608 | int sftcnt = (i << (3 - sft)) & sftmsk; | |
609 | /* Do not store the reserved bbt blocks ! */ | |
610 | buf[offs + (i >> sft)] &= ~(msk[dat & 0x03] << sftcnt); | |
611 | dat >>= 2; | |
612 | } | |
613 | } | |
61b03bd7 | 614 | |
1da177e4 LT |
615 | memset (&einfo, 0, sizeof (einfo)); |
616 | einfo.mtd = mtd; | |
617 | einfo.addr = (unsigned long) to; | |
618 | einfo.len = 1 << this->bbt_erase_shift; | |
619 | res = nand_erase_nand (mtd, &einfo, 1); | |
620 | if (res < 0) { | |
621 | printk (KERN_WARNING "nand_bbt: Error during block erase: %d\n", res); | |
622 | return res; | |
623 | } | |
61b03bd7 | 624 | |
1da177e4 LT |
625 | res = mtd->write_ecc (mtd, to, len, &retlen, buf, &buf[len], &oobinfo); |
626 | if (res < 0) { | |
627 | printk (KERN_WARNING "nand_bbt: Error while writing bad block table %d\n", res); | |
628 | return res; | |
629 | } | |
61b03bd7 | 630 | printk (KERN_DEBUG "Bad block table written to 0x%08x, version 0x%02X\n", |
1da177e4 | 631 | (unsigned int) to, td->version[chip]); |
61b03bd7 | 632 | |
1da177e4 LT |
633 | /* Mark it as used */ |
634 | td->pages[chip] = page; | |
61b03bd7 | 635 | } |
1da177e4 LT |
636 | return 0; |
637 | } | |
638 | ||
639 | /** | |
640 | * nand_memory_bbt - [GENERIC] create a memory based bad block table | |
641 | * @mtd: MTD device structure | |
642 | * @bd: descriptor for the good/bad block search pattern | |
643 | * | |
61b03bd7 | 644 | * The function creates a memory based bbt by scanning the device |
1da177e4 LT |
645 | * for manufacturer / software marked good / bad blocks |
646 | */ | |
171650af | 647 | static inline int nand_memory_bbt (struct mtd_info *mtd, struct nand_bbt_descr *bd) |
1da177e4 LT |
648 | { |
649 | struct nand_chip *this = mtd->priv; | |
650 | ||
171650af | 651 | bd->options &= ~NAND_BBT_SCANEMPTY; |
eeada24d | 652 | return create_bbt (mtd, this->data_buf, bd, -1); |
1da177e4 LT |
653 | } |
654 | ||
655 | /** | |
656 | * check_create - [GENERIC] create and write bbt(s) if neccecary | |
657 | * @mtd: MTD device structure | |
658 | * @buf: temporary buffer | |
659 | * @bd: descriptor for the good/bad block search pattern | |
660 | * | |
661 | * The function checks the results of the previous call to read_bbt | |
662 | * and creates / updates the bbt(s) if neccecary | |
663 | * Creation is neccecary if no bbt was found for the chip/device | |
664 | * Update is neccecary if one of the tables is missing or the | |
665 | * version nr. of one table is less than the other | |
666 | */ | |
667 | static int check_create (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *bd) | |
668 | { | |
669 | int i, chips, writeops, chipsel, res; | |
670 | struct nand_chip *this = mtd->priv; | |
671 | struct nand_bbt_descr *td = this->bbt_td; | |
672 | struct nand_bbt_descr *md = this->bbt_md; | |
673 | struct nand_bbt_descr *rd, *rd2; | |
674 | ||
675 | /* Do we have a bbt per chip ? */ | |
61b03bd7 | 676 | if (td->options & NAND_BBT_PERCHIP) |
1da177e4 | 677 | chips = this->numchips; |
61b03bd7 | 678 | else |
1da177e4 | 679 | chips = 1; |
61b03bd7 | 680 | |
1da177e4 LT |
681 | for (i = 0; i < chips; i++) { |
682 | writeops = 0; | |
683 | rd = NULL; | |
684 | rd2 = NULL; | |
685 | /* Per chip or per device ? */ | |
686 | chipsel = (td->options & NAND_BBT_PERCHIP) ? i : -1; | |
687 | /* Mirrored table avilable ? */ | |
688 | if (md) { | |
689 | if (td->pages[i] == -1 && md->pages[i] == -1) { | |
690 | writeops = 0x03; | |
691 | goto create; | |
692 | } | |
693 | ||
694 | if (td->pages[i] == -1) { | |
61b03bd7 | 695 | rd = md; |
1da177e4 LT |
696 | td->version[i] = md->version[i]; |
697 | writeops = 1; | |
698 | goto writecheck; | |
699 | } | |
700 | ||
701 | if (md->pages[i] == -1) { | |
702 | rd = td; | |
703 | md->version[i] = td->version[i]; | |
704 | writeops = 2; | |
705 | goto writecheck; | |
706 | } | |
707 | ||
708 | if (td->version[i] == md->version[i]) { | |
709 | rd = td; | |
710 | if (!(td->options & NAND_BBT_VERSION)) | |
711 | rd2 = md; | |
712 | goto writecheck; | |
61b03bd7 | 713 | } |
1da177e4 LT |
714 | |
715 | if (((int8_t) (td->version[i] - md->version[i])) > 0) { | |
716 | rd = td; | |
717 | md->version[i] = td->version[i]; | |
718 | writeops = 2; | |
719 | } else { | |
720 | rd = md; | |
721 | td->version[i] = md->version[i]; | |
722 | writeops = 1; | |
723 | } | |
724 | ||
725 | goto writecheck; | |
726 | ||
727 | } else { | |
728 | if (td->pages[i] == -1) { | |
729 | writeops = 0x01; | |
730 | goto create; | |
731 | } | |
732 | rd = td; | |
733 | goto writecheck; | |
734 | } | |
735 | create: | |
736 | /* Create the bad block table by scanning the device ? */ | |
737 | if (!(td->options & NAND_BBT_CREATE)) | |
61b03bd7 TG |
738 | continue; |
739 | ||
1da177e4 LT |
740 | /* Create the table in memory by scanning the chip(s) */ |
741 | create_bbt (mtd, buf, bd, chipsel); | |
61b03bd7 | 742 | |
1da177e4 LT |
743 | td->version[i] = 1; |
744 | if (md) | |
61b03bd7 TG |
745 | md->version[i] = 1; |
746 | writecheck: | |
1da177e4 LT |
747 | /* read back first ? */ |
748 | if (rd) | |
749 | read_abs_bbt (mtd, buf, rd, chipsel); | |
750 | /* If they weren't versioned, read both. */ | |
751 | if (rd2) | |
752 | read_abs_bbt (mtd, buf, rd2, chipsel); | |
753 | ||
754 | /* Write the bad block table to the device ? */ | |
755 | if ((writeops & 0x01) && (td->options & NAND_BBT_WRITE)) { | |
756 | res = write_bbt (mtd, buf, td, md, chipsel); | |
757 | if (res < 0) | |
758 | return res; | |
759 | } | |
61b03bd7 | 760 | |
1da177e4 LT |
761 | /* Write the mirror bad block table to the device ? */ |
762 | if ((writeops & 0x02) && md && (md->options & NAND_BBT_WRITE)) { | |
763 | res = write_bbt (mtd, buf, md, td, chipsel); | |
764 | if (res < 0) | |
765 | return res; | |
766 | } | |
767 | } | |
61b03bd7 | 768 | return 0; |
1da177e4 LT |
769 | } |
770 | ||
771 | /** | |
61b03bd7 | 772 | * mark_bbt_regions - [GENERIC] mark the bad block table regions |
1da177e4 LT |
773 | * @mtd: MTD device structure |
774 | * @td: bad block table descriptor | |
775 | * | |
776 | * The bad block table regions are marked as "bad" to prevent | |
777 | * accidental erasures / writes. The regions are identified by | |
778 | * the mark 0x02. | |
779 | */ | |
780 | static void mark_bbt_region (struct mtd_info *mtd, struct nand_bbt_descr *td) | |
781 | { | |
782 | struct nand_chip *this = mtd->priv; | |
783 | int i, j, chips, block, nrblocks, update; | |
784 | uint8_t oldval, newval; | |
785 | ||
786 | /* Do we have a bbt per chip ? */ | |
787 | if (td->options & NAND_BBT_PERCHIP) { | |
788 | chips = this->numchips; | |
789 | nrblocks = (int)(this->chipsize >> this->bbt_erase_shift); | |
790 | } else { | |
791 | chips = 1; | |
792 | nrblocks = (int)(mtd->size >> this->bbt_erase_shift); | |
61b03bd7 TG |
793 | } |
794 | ||
1da177e4 LT |
795 | for (i = 0; i < chips; i++) { |
796 | if ((td->options & NAND_BBT_ABSPAGE) || | |
797 | !(td->options & NAND_BBT_WRITE)) { | |
798 | if (td->pages[i] == -1) continue; | |
799 | block = td->pages[i] >> (this->bbt_erase_shift - this->page_shift); | |
61b03bd7 | 800 | block <<= 1; |
1da177e4 LT |
801 | oldval = this->bbt[(block >> 3)]; |
802 | newval = oldval | (0x2 << (block & 0x06)); | |
803 | this->bbt[(block >> 3)] = newval; | |
804 | if ((oldval != newval) && td->reserved_block_code) | |
805 | nand_update_bbt(mtd, block << (this->bbt_erase_shift - 1)); | |
806 | continue; | |
807 | } | |
808 | update = 0; | |
809 | if (td->options & NAND_BBT_LASTBLOCK) | |
810 | block = ((i + 1) * nrblocks) - td->maxblocks; | |
61b03bd7 | 811 | else |
1da177e4 | 812 | block = i * nrblocks; |
61b03bd7 | 813 | block <<= 1; |
1da177e4 LT |
814 | for (j = 0; j < td->maxblocks; j++) { |
815 | oldval = this->bbt[(block >> 3)]; | |
816 | newval = oldval | (0x2 << (block & 0x06)); | |
817 | this->bbt[(block >> 3)] = newval; | |
818 | if (oldval != newval) update = 1; | |
819 | block += 2; | |
61b03bd7 | 820 | } |
1da177e4 LT |
821 | /* If we want reserved blocks to be recorded to flash, and some |
822 | new ones have been marked, then we need to update the stored | |
823 | bbts. This should only happen once. */ | |
824 | if (update && td->reserved_block_code) | |
825 | nand_update_bbt(mtd, (block - 2) << (this->bbt_erase_shift - 1)); | |
826 | } | |
827 | } | |
828 | ||
829 | /** | |
830 | * nand_scan_bbt - [NAND Interface] scan, find, read and maybe create bad block table(s) | |
831 | * @mtd: MTD device structure | |
832 | * @bd: descriptor for the good/bad block search pattern | |
833 | * | |
61b03bd7 | 834 | * The function checks, if a bad block table(s) is/are already |
1da177e4 LT |
835 | * available. If not it scans the device for manufacturer |
836 | * marked good / bad blocks and writes the bad block table(s) to | |
837 | * the selected place. | |
838 | * | |
839 | * The bad block table memory is allocated here. It must be freed | |
840 | * by calling the nand_free_bbt function. | |
841 | * | |
842 | */ | |
843 | int nand_scan_bbt (struct mtd_info *mtd, struct nand_bbt_descr *bd) | |
844 | { | |
845 | struct nand_chip *this = mtd->priv; | |
846 | int len, res = 0; | |
847 | uint8_t *buf; | |
848 | struct nand_bbt_descr *td = this->bbt_td; | |
849 | struct nand_bbt_descr *md = this->bbt_md; | |
850 | ||
851 | len = mtd->size >> (this->bbt_erase_shift + 2); | |
852 | /* Allocate memory (2bit per block) */ | |
853 | this->bbt = kmalloc (len, GFP_KERNEL); | |
854 | if (!this->bbt) { | |
855 | printk (KERN_ERR "nand_scan_bbt: Out of memory\n"); | |
856 | return -ENOMEM; | |
857 | } | |
858 | /* Clear the memory bad block table */ | |
859 | memset (this->bbt, 0x00, len); | |
860 | ||
861 | /* If no primary table decriptor is given, scan the device | |
862 | * to build a memory based bad block table | |
863 | */ | |
eeada24d AB |
864 | if (!td) { |
865 | if ((res = nand_memory_bbt(mtd, bd))) { | |
866 | printk (KERN_ERR "nand_bbt: Can't scan flash and build the RAM-based BBT\n"); | |
867 | kfree (this->bbt); | |
868 | this->bbt = NULL; | |
869 | } | |
870 | return res; | |
871 | } | |
1da177e4 LT |
872 | |
873 | /* Allocate a temporary buffer for one eraseblock incl. oob */ | |
874 | len = (1 << this->bbt_erase_shift); | |
875 | len += (len >> this->page_shift) * mtd->oobsize; | |
876 | buf = kmalloc (len, GFP_KERNEL); | |
877 | if (!buf) { | |
878 | printk (KERN_ERR "nand_bbt: Out of memory\n"); | |
879 | kfree (this->bbt); | |
880 | this->bbt = NULL; | |
881 | return -ENOMEM; | |
882 | } | |
61b03bd7 | 883 | |
1da177e4 LT |
884 | /* Is the bbt at a given page ? */ |
885 | if (td->options & NAND_BBT_ABSPAGE) { | |
886 | res = read_abs_bbts (mtd, buf, td, md); | |
61b03bd7 | 887 | } else { |
1da177e4 LT |
888 | /* Search the bad block table using a pattern in oob */ |
889 | res = search_read_bbts (mtd, buf, td, md); | |
61b03bd7 | 890 | } |
1da177e4 | 891 | |
61b03bd7 | 892 | if (res) |
1da177e4 | 893 | res = check_create (mtd, buf, bd); |
61b03bd7 | 894 | |
1da177e4 LT |
895 | /* Prevent the bbt regions from erasing / writing */ |
896 | mark_bbt_region (mtd, td); | |
897 | if (md) | |
898 | mark_bbt_region (mtd, md); | |
61b03bd7 | 899 | |
1da177e4 LT |
900 | kfree (buf); |
901 | return res; | |
902 | } | |
903 | ||
904 | ||
905 | /** | |
61b03bd7 | 906 | * nand_update_bbt - [NAND Interface] update bad block table(s) |
1da177e4 LT |
907 | * @mtd: MTD device structure |
908 | * @offs: the offset of the newly marked block | |
909 | * | |
910 | * The function updates the bad block table(s) | |
911 | */ | |
912 | int nand_update_bbt (struct mtd_info *mtd, loff_t offs) | |
913 | { | |
914 | struct nand_chip *this = mtd->priv; | |
915 | int len, res = 0, writeops = 0; | |
916 | int chip, chipsel; | |
917 | uint8_t *buf; | |
918 | struct nand_bbt_descr *td = this->bbt_td; | |
919 | struct nand_bbt_descr *md = this->bbt_md; | |
920 | ||
921 | if (!this->bbt || !td) | |
922 | return -EINVAL; | |
923 | ||
924 | len = mtd->size >> (this->bbt_erase_shift + 2); | |
925 | /* Allocate a temporary buffer for one eraseblock incl. oob */ | |
926 | len = (1 << this->bbt_erase_shift); | |
927 | len += (len >> this->page_shift) * mtd->oobsize; | |
928 | buf = kmalloc (len, GFP_KERNEL); | |
929 | if (!buf) { | |
930 | printk (KERN_ERR "nand_update_bbt: Out of memory\n"); | |
931 | return -ENOMEM; | |
932 | } | |
61b03bd7 | 933 | |
1da177e4 LT |
934 | writeops = md != NULL ? 0x03 : 0x01; |
935 | ||
936 | /* Do we have a bbt per chip ? */ | |
937 | if (td->options & NAND_BBT_PERCHIP) { | |
938 | chip = (int) (offs >> this->chip_shift); | |
939 | chipsel = chip; | |
940 | } else { | |
941 | chip = 0; | |
942 | chipsel = -1; | |
943 | } | |
944 | ||
945 | td->version[chip]++; | |
946 | if (md) | |
61b03bd7 | 947 | md->version[chip]++; |
1da177e4 LT |
948 | |
949 | /* Write the bad block table to the device ? */ | |
950 | if ((writeops & 0x01) && (td->options & NAND_BBT_WRITE)) { | |
951 | res = write_bbt (mtd, buf, td, md, chipsel); | |
952 | if (res < 0) | |
953 | goto out; | |
954 | } | |
955 | /* Write the mirror bad block table to the device ? */ | |
956 | if ((writeops & 0x02) && md && (md->options & NAND_BBT_WRITE)) { | |
957 | res = write_bbt (mtd, buf, md, td, chipsel); | |
958 | } | |
959 | ||
61b03bd7 | 960 | out: |
1da177e4 LT |
961 | kfree (buf); |
962 | return res; | |
963 | } | |
964 | ||
61b03bd7 | 965 | /* Define some generic bad / good block scan pattern which are used |
171650af | 966 | * while scanning a device for factory marked good / bad blocks. */ |
1da177e4 LT |
967 | static uint8_t scan_ff_pattern[] = { 0xff, 0xff }; |
968 | ||
969 | static struct nand_bbt_descr smallpage_memorybased = { | |
171650af | 970 | .options = NAND_BBT_SCAN2NDPAGE, |
1da177e4 LT |
971 | .offs = 5, |
972 | .len = 1, | |
973 | .pattern = scan_ff_pattern | |
974 | }; | |
975 | ||
976 | static struct nand_bbt_descr largepage_memorybased = { | |
977 | .options = 0, | |
978 | .offs = 0, | |
979 | .len = 2, | |
980 | .pattern = scan_ff_pattern | |
981 | }; | |
982 | ||
983 | static struct nand_bbt_descr smallpage_flashbased = { | |
984 | .options = NAND_BBT_SCANEMPTY | NAND_BBT_SCANALLPAGES, | |
985 | .offs = 5, | |
986 | .len = 1, | |
987 | .pattern = scan_ff_pattern | |
988 | }; | |
989 | ||
990 | static struct nand_bbt_descr largepage_flashbased = { | |
991 | .options = NAND_BBT_SCANEMPTY | NAND_BBT_SCANALLPAGES, | |
992 | .offs = 0, | |
993 | .len = 2, | |
994 | .pattern = scan_ff_pattern | |
995 | }; | |
996 | ||
997 | static uint8_t scan_agand_pattern[] = { 0x1C, 0x71, 0xC7, 0x1C, 0x71, 0xC7 }; | |
998 | ||
999 | static struct nand_bbt_descr agand_flashbased = { | |
1000 | .options = NAND_BBT_SCANEMPTY | NAND_BBT_SCANALLPAGES, | |
1001 | .offs = 0x20, | |
1002 | .len = 6, | |
1003 | .pattern = scan_agand_pattern | |
1004 | }; | |
1005 | ||
1006 | /* Generic flash bbt decriptors | |
1007 | */ | |
1008 | static uint8_t bbt_pattern[] = {'B', 'b', 't', '0' }; | |
1009 | static uint8_t mirror_pattern[] = {'1', 't', 'b', 'B' }; | |
1010 | ||
1011 | static struct nand_bbt_descr bbt_main_descr = { | |
61b03bd7 | 1012 | .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
1da177e4 LT |
1013 | | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP, |
1014 | .offs = 8, | |
1015 | .len = 4, | |
1016 | .veroffs = 12, | |
1017 | .maxblocks = 4, | |
1018 | .pattern = bbt_pattern | |
1019 | }; | |
1020 | ||
1021 | static struct nand_bbt_descr bbt_mirror_descr = { | |
61b03bd7 | 1022 | .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
1da177e4 LT |
1023 | | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP, |
1024 | .offs = 8, | |
1025 | .len = 4, | |
1026 | .veroffs = 12, | |
1027 | .maxblocks = 4, | |
1028 | .pattern = mirror_pattern | |
1029 | }; | |
1030 | ||
1031 | /** | |
61b03bd7 | 1032 | * nand_default_bbt - [NAND Interface] Select a default bad block table for the device |
1da177e4 LT |
1033 | * @mtd: MTD device structure |
1034 | * | |
1035 | * This function selects the default bad block table | |
1036 | * support for the device and calls the nand_scan_bbt function | |
1037 | * | |
1038 | */ | |
1039 | int nand_default_bbt (struct mtd_info *mtd) | |
1040 | { | |
1041 | struct nand_chip *this = mtd->priv; | |
61b03bd7 TG |
1042 | |
1043 | /* Default for AG-AND. We must use a flash based | |
1da177e4 LT |
1044 | * bad block table as the devices have factory marked |
1045 | * _good_ blocks. Erasing those blocks leads to loss | |
1046 | * of the good / bad information, so we _must_ store | |
61b03bd7 | 1047 | * this information in a good / bad table during |
1da177e4 LT |
1048 | * startup |
1049 | */ | |
1050 | if (this->options & NAND_IS_AND) { | |
1051 | /* Use the default pattern descriptors */ | |
61b03bd7 | 1052 | if (!this->bbt_td) { |
1da177e4 LT |
1053 | this->bbt_td = &bbt_main_descr; |
1054 | this->bbt_md = &bbt_mirror_descr; | |
61b03bd7 | 1055 | } |
1da177e4 LT |
1056 | this->options |= NAND_USE_FLASH_BBT; |
1057 | return nand_scan_bbt (mtd, &agand_flashbased); | |
1058 | } | |
61b03bd7 TG |
1059 | |
1060 | ||
1da177e4 LT |
1061 | /* Is a flash based bad block table requested ? */ |
1062 | if (this->options & NAND_USE_FLASH_BBT) { | |
61b03bd7 TG |
1063 | /* Use the default pattern descriptors */ |
1064 | if (!this->bbt_td) { | |
1da177e4 LT |
1065 | this->bbt_td = &bbt_main_descr; |
1066 | this->bbt_md = &bbt_mirror_descr; | |
1067 | } | |
1068 | if (!this->badblock_pattern) { | |
1069 | this->badblock_pattern = (mtd->oobblock > 512) ? | |
1070 | &largepage_flashbased : &smallpage_flashbased; | |
1071 | } | |
1072 | } else { | |
1073 | this->bbt_td = NULL; | |
1074 | this->bbt_md = NULL; | |
1075 | if (!this->badblock_pattern) { | |
1076 | this->badblock_pattern = (mtd->oobblock > 512) ? | |
1077 | &largepage_memorybased : &smallpage_memorybased; | |
1078 | } | |
1079 | } | |
1080 | return nand_scan_bbt (mtd, this->badblock_pattern); | |
1081 | } | |
1082 | ||
1083 | /** | |
61b03bd7 | 1084 | * nand_isbad_bbt - [NAND Interface] Check if a block is bad |
1da177e4 LT |
1085 | * @mtd: MTD device structure |
1086 | * @offs: offset in the device | |
1087 | * @allowbbt: allow access to bad block table region | |
1088 | * | |
1089 | */ | |
1090 | int nand_isbad_bbt (struct mtd_info *mtd, loff_t offs, int allowbbt) | |
1091 | { | |
1092 | struct nand_chip *this = mtd->priv; | |
1093 | int block; | |
1094 | uint8_t res; | |
61b03bd7 | 1095 | |
1da177e4 LT |
1096 | /* Get block number * 2 */ |
1097 | block = (int) (offs >> (this->bbt_erase_shift - 1)); | |
1098 | res = (this->bbt[block >> 3] >> (block & 0x06)) & 0x03; | |
1099 | ||
61b03bd7 | 1100 | DEBUG (MTD_DEBUG_LEVEL2, "nand_isbad_bbt(): bbt info for offs 0x%08x: (block %d) 0x%02x\n", |
eeada24d | 1101 | (unsigned int)offs, block >> 1, res); |
1da177e4 LT |
1102 | |
1103 | switch ((int)res) { | |
1104 | case 0x00: return 0; | |
1105 | case 0x01: return 1; | |
1106 | case 0x02: return allowbbt ? 0 : 1; | |
1107 | } | |
1108 | return 1; | |
1109 | } | |
1110 | ||
1111 | EXPORT_SYMBOL (nand_scan_bbt); | |
1112 | EXPORT_SYMBOL (nand_default_bbt); |