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932394ac WD |
1 | /* |
2 | * drivers/mtd/nand_bbt.c | |
3 | * | |
4 | * Overview: | |
5 | * Bad block table support for the NAND driver | |
ac7eb8a3 | 6 | * |
932394ac WD |
7 | * Copyright (C) 2004 Thomas Gleixner (tglx@linutronix.de) |
8 | * | |
9 | * $Id: nand_bbt.c,v 1.28 2004/11/13 10:19:09 gleixner Exp $ | |
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 | * | |
ac7eb8a3 WD |
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 | |
932394ac | 20 | * mirrored bbt is selected then the mirror is searched too and the |
ac7eb8a3 | 21 | * versions are compared. If the mirror has a greater version number |
932394ac WD |
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. | |
ac7eb8a3 WD |
24 | * If one of the bbt's is out of date or does not exist it is (re)created.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. | |
932394ac | 27 | * |
ac7eb8a3 | 28 | * For manufacturer created bbts like the one found on M-SYS DOC devices |
932394ac WD |
29 | * the bbt is searched and read but never created |
30 | * | |
ac7eb8a3 WD |
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 | |
932394ac WD |
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 | |
ac7eb8a3 | 46 | * |
932394ac WD |
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 | |
ac7eb8a3 | 52 | * |
932394ac WD |
53 | */ |
54 | ||
55 | #include <common.h> | |
56 | ||
cb51c0bf | 57 | #if defined(CONFIG_CMD_NAND) && !defined(CFG_NAND_LEGACY) |
932394ac WD |
58 | |
59 | #include <malloc.h> | |
60 | #include <linux/mtd/compat.h> | |
61 | #include <linux/mtd/mtd.h> | |
62 | #include <linux/mtd/nand.h> | |
63 | ||
64 | #include <asm/errno.h> | |
65 | ||
ac7eb8a3 | 66 | /** |
932394ac WD |
67 | * check_pattern - [GENERIC] check if a pattern is in the buffer |
68 | * @buf: the buffer to search | |
69 | * @len: the length of buffer to search | |
70 | * @paglen: the pagelength | |
71 | * @td: search pattern descriptor | |
72 | * | |
73 | * Check for a pattern at the given place. Used to search bad block | |
74 | * tables and good / bad block identifiers. | |
75 | * If the SCAN_EMPTY option is set then check, if all bytes except the | |
76 | * pattern area contain 0xff | |
77 | * | |
78 | */ | |
79 | static int check_pattern (uint8_t *buf, int len, int paglen, struct nand_bbt_descr *td) | |
80 | { | |
81 | int i, end; | |
82 | uint8_t *p = buf; | |
83 | ||
84 | end = paglen + td->offs; | |
85 | if (td->options & NAND_BBT_SCANEMPTY) { | |
86 | for (i = 0; i < end; i++) { | |
87 | if (p[i] != 0xff) | |
88 | return -1; | |
89 | } | |
ac7eb8a3 | 90 | } |
932394ac | 91 | p += end; |
ac7eb8a3 | 92 | |
932394ac WD |
93 | /* Compare the pattern */ |
94 | for (i = 0; i < td->len; i++) { | |
95 | if (p[i] != td->pattern[i]) | |
96 | return -1; | |
97 | } | |
98 | ||
99 | p += td->len; | |
100 | end += td->len; | |
101 | if (td->options & NAND_BBT_SCANEMPTY) { | |
102 | for (i = end; i < len; i++) { | |
103 | if (*p++ != 0xff) | |
104 | return -1; | |
105 | } | |
106 | } | |
107 | return 0; | |
108 | } | |
109 | ||
110 | /** | |
111 | * read_bbt - [GENERIC] Read the bad block table starting from page | |
112 | * @mtd: MTD device structure | |
113 | * @buf: temporary buffer | |
114 | * @page: the starting page | |
115 | * @num: the number of bbt descriptors to read | |
116 | * @bits: number of bits per block | |
117 | * @offs: offset in the memory table | |
118 | * @reserved_block_code: Pattern to identify reserved blocks | |
119 | * | |
120 | * Read the bad block table starting from page. | |
121 | * | |
122 | */ | |
ac7eb8a3 | 123 | static int read_bbt (struct mtd_info *mtd, uint8_t *buf, int page, int num, |
932394ac WD |
124 | int bits, int offs, int reserved_block_code) |
125 | { | |
126 | int res, i, j, act = 0; | |
127 | struct nand_chip *this = mtd->priv; | |
128 | size_t retlen, len, totlen; | |
129 | loff_t from; | |
130 | uint8_t msk = (uint8_t) ((1 << bits) - 1); | |
131 | ||
132 | totlen = (num * bits) >> 3; | |
133 | from = ((loff_t)page) << this->page_shift; | |
ac7eb8a3 | 134 | |
932394ac WD |
135 | while (totlen) { |
136 | len = min (totlen, (size_t) (1 << this->bbt_erase_shift)); | |
137 | res = mtd->read_ecc (mtd, from, len, &retlen, buf, NULL, this->autooob); | |
138 | if (res < 0) { | |
139 | if (retlen != len) { | |
140 | printk (KERN_INFO "nand_bbt: Error reading bad block table\n"); | |
141 | return res; | |
142 | } | |
143 | printk (KERN_WARNING "nand_bbt: ECC error while reading bad block table\n"); | |
ac7eb8a3 | 144 | } |
932394ac WD |
145 | |
146 | /* Analyse data */ | |
147 | for (i = 0; i < len; i++) { | |
148 | uint8_t dat = buf[i]; | |
149 | for (j = 0; j < 8; j += bits, act += 2) { | |
150 | uint8_t tmp = (dat >> j) & msk; | |
151 | if (tmp == msk) | |
152 | continue; | |
153 | if (reserved_block_code && | |
154 | (tmp == reserved_block_code)) { | |
155 | printk (KERN_DEBUG "nand_read_bbt: Reserved block at 0x%08x\n", | |
156 | ((offs << 2) + (act >> 1)) << this->bbt_erase_shift); | |
157 | this->bbt[offs + (act >> 3)] |= 0x2 << (act & 0x06); | |
158 | continue; | |
159 | } | |
160 | /* Leave it for now, if its matured we can move this | |
161 | * message to MTD_DEBUG_LEVEL0 */ | |
162 | printk (KERN_DEBUG "nand_read_bbt: Bad block at 0x%08x\n", | |
163 | ((offs << 2) + (act >> 1)) << this->bbt_erase_shift); | |
ac7eb8a3 | 164 | /* Factory marked bad or worn out ? */ |
932394ac WD |
165 | if (tmp == 0) |
166 | this->bbt[offs + (act >> 3)] |= 0x3 << (act & 0x06); | |
167 | else | |
168 | this->bbt[offs + (act >> 3)] |= 0x1 << (act & 0x06); | |
ac7eb8a3 | 169 | } |
932394ac WD |
170 | } |
171 | totlen -= len; | |
172 | from += len; | |
173 | } | |
174 | return 0; | |
175 | } | |
176 | ||
177 | /** | |
178 | * read_abs_bbt - [GENERIC] Read the bad block table starting at a given page | |
179 | * @mtd: MTD device structure | |
180 | * @buf: temporary buffer | |
ac7eb8a3 | 181 | * @td: descriptor for the bad block table |
932394ac WD |
182 | * @chip: read the table for a specific chip, -1 read all chips. |
183 | * Applies only if NAND_BBT_PERCHIP option is set | |
184 | * | |
185 | * Read the bad block table for all chips starting at a given page | |
186 | * We assume that the bbt bits are in consecutive order. | |
187 | */ | |
188 | static int read_abs_bbt (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td, int chip) | |
189 | { | |
190 | struct nand_chip *this = mtd->priv; | |
191 | int res = 0, i; | |
192 | int bits; | |
193 | ||
194 | bits = td->options & NAND_BBT_NRBITS_MSK; | |
195 | if (td->options & NAND_BBT_PERCHIP) { | |
196 | int offs = 0; | |
197 | for (i = 0; i < this->numchips; i++) { | |
198 | if (chip == -1 || chip == i) | |
199 | res = read_bbt (mtd, buf, td->pages[i], this->chipsize >> this->bbt_erase_shift, bits, offs, td->reserved_block_code); | |
200 | if (res) | |
201 | return res; | |
202 | offs += this->chipsize >> (this->bbt_erase_shift + 2); | |
203 | } | |
204 | } else { | |
205 | res = read_bbt (mtd, buf, td->pages[0], mtd->size >> this->bbt_erase_shift, bits, 0, td->reserved_block_code); | |
206 | if (res) | |
207 | return res; | |
208 | } | |
209 | return 0; | |
210 | } | |
211 | ||
212 | /** | |
213 | * read_abs_bbts - [GENERIC] Read the bad block table(s) for all chips starting at a given page | |
214 | * @mtd: MTD device structure | |
215 | * @buf: temporary buffer | |
ac7eb8a3 | 216 | * @td: descriptor for the bad block table |
932394ac WD |
217 | * @md: descriptor for the bad block table mirror |
218 | * | |
219 | * Read the bad block table(s) for all chips starting at a given page | |
220 | * We assume that the bbt bits are in consecutive order. | |
221 | * | |
222 | */ | |
223 | static int read_abs_bbts (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td, | |
224 | struct nand_bbt_descr *md) | |
225 | { | |
226 | struct nand_chip *this = mtd->priv; | |
227 | ||
ac7eb8a3 | 228 | /* Read the primary version, if available */ |
932394ac | 229 | if (td->options & NAND_BBT_VERSION) { |
ac7eb8a3 | 230 | nand_read_raw (mtd, buf, td->pages[0] << this->page_shift, mtd->oobblock, mtd->oobsize); |
932394ac WD |
231 | td->version[0] = buf[mtd->oobblock + td->veroffs]; |
232 | printk (KERN_DEBUG "Bad block table at page %d, version 0x%02X\n", td->pages[0], td->version[0]); | |
233 | } | |
234 | ||
ac7eb8a3 | 235 | /* Read the mirror version, if available */ |
932394ac | 236 | if (md && (md->options & NAND_BBT_VERSION)) { |
ac7eb8a3 | 237 | nand_read_raw (mtd, buf, md->pages[0] << this->page_shift, mtd->oobblock, mtd->oobsize); |
932394ac WD |
238 | md->version[0] = buf[mtd->oobblock + md->veroffs]; |
239 | printk (KERN_DEBUG "Bad block table at page %d, version 0x%02X\n", md->pages[0], md->version[0]); | |
240 | } | |
241 | ||
242 | return 1; | |
243 | } | |
244 | ||
245 | /** | |
246 | * create_bbt - [GENERIC] Create a bad block table by scanning the device | |
247 | * @mtd: MTD device structure | |
248 | * @buf: temporary buffer | |
249 | * @bd: descriptor for the good/bad block search pattern | |
250 | * @chip: create the table for a specific chip, -1 read all chips. | |
251 | * Applies only if NAND_BBT_PERCHIP option is set | |
252 | * | |
253 | * Create a bad block table by scanning the device | |
254 | * for the given good/bad block identify pattern | |
255 | */ | |
256 | static void create_bbt (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *bd, int chip) | |
257 | { | |
258 | struct nand_chip *this = mtd->priv; | |
259 | int i, j, numblocks, len, scanlen; | |
260 | int startblock; | |
261 | loff_t from; | |
262 | size_t readlen, ooblen; | |
263 | ||
932394ac WD |
264 | if (bd->options & NAND_BBT_SCANALLPAGES) |
265 | len = 1 << (this->bbt_erase_shift - this->page_shift); | |
266 | else { | |
267 | if (bd->options & NAND_BBT_SCAN2NDPAGE) | |
268 | len = 2; | |
ac7eb8a3 | 269 | else |
932394ac WD |
270 | len = 1; |
271 | } | |
272 | scanlen = mtd->oobblock + mtd->oobsize; | |
273 | readlen = len * mtd->oobblock; | |
274 | ooblen = len * mtd->oobsize; | |
275 | ||
276 | if (chip == -1) { | |
277 | /* Note that numblocks is 2 * (real numblocks) here, see i+=2 below as it | |
278 | * makes shifting and masking less painful */ | |
279 | numblocks = mtd->size >> (this->bbt_erase_shift - 1); | |
280 | startblock = 0; | |
281 | from = 0; | |
282 | } else { | |
283 | if (chip >= this->numchips) { | |
284 | printk (KERN_WARNING "create_bbt(): chipnr (%d) > available chips (%d)\n", | |
285 | chip + 1, this->numchips); | |
ac7eb8a3 | 286 | return; |
932394ac WD |
287 | } |
288 | numblocks = this->chipsize >> (this->bbt_erase_shift - 1); | |
289 | startblock = chip * numblocks; | |
290 | numblocks += startblock; | |
291 | from = startblock << (this->bbt_erase_shift - 1); | |
292 | } | |
ac7eb8a3 | 293 | |
932394ac WD |
294 | for (i = startblock; i < numblocks;) { |
295 | nand_read_raw (mtd, buf, from, readlen, ooblen); | |
296 | for (j = 0; j < len; j++) { | |
297 | if (check_pattern (&buf[j * scanlen], scanlen, mtd->oobblock, bd)) { | |
298 | this->bbt[i >> 3] |= 0x03 << (i & 0x6); | |
932394ac WD |
299 | break; |
300 | } | |
301 | } | |
302 | i += 2; | |
303 | from += (1 << this->bbt_erase_shift); | |
304 | } | |
305 | } | |
306 | ||
307 | /** | |
308 | * search_bbt - [GENERIC] scan the device for a specific bad block table | |
309 | * @mtd: MTD device structure | |
310 | * @buf: temporary buffer | |
311 | * @td: descriptor for the bad block table | |
312 | * | |
313 | * Read the bad block table by searching for a given ident pattern. | |
ac7eb8a3 | 314 | * Search is preformed either from the beginning up or from the end of |
932394ac WD |
315 | * the device downwards. The search starts always at the start of a |
316 | * block. | |
ac7eb8a3 | 317 | * If the option NAND_BBT_PERCHIP is given, each chip is searched |
932394ac WD |
318 | * for a bbt, which contains the bad block information of this chip. |
319 | * This is neccecary to provide support for certain DOC devices. | |
320 | * | |
ac7eb8a3 WD |
321 | * The bbt ident pattern resides in the oob area of the first page |
322 | * in a block. | |
932394ac WD |
323 | */ |
324 | static int search_bbt (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td) | |
325 | { | |
326 | struct nand_chip *this = mtd->priv; | |
327 | int i, chips; | |
328 | int bits, startblock, block, dir; | |
329 | int scanlen = mtd->oobblock + mtd->oobsize; | |
330 | int bbtblocks; | |
331 | ||
332 | /* Search direction top -> down ? */ | |
333 | if (td->options & NAND_BBT_LASTBLOCK) { | |
334 | startblock = (mtd->size >> this->bbt_erase_shift) -1; | |
335 | dir = -1; | |
336 | } else { | |
ac7eb8a3 | 337 | startblock = 0; |
932394ac | 338 | dir = 1; |
ac7eb8a3 WD |
339 | } |
340 | ||
932394ac WD |
341 | /* Do we have a bbt per chip ? */ |
342 | if (td->options & NAND_BBT_PERCHIP) { | |
343 | chips = this->numchips; | |
344 | bbtblocks = this->chipsize >> this->bbt_erase_shift; | |
345 | startblock &= bbtblocks - 1; | |
346 | } else { | |
347 | chips = 1; | |
348 | bbtblocks = mtd->size >> this->bbt_erase_shift; | |
349 | } | |
ac7eb8a3 | 350 | |
932394ac WD |
351 | /* Number of bits for each erase block in the bbt */ |
352 | bits = td->options & NAND_BBT_NRBITS_MSK; | |
ac7eb8a3 | 353 | |
932394ac WD |
354 | for (i = 0; i < chips; i++) { |
355 | /* Reset version information */ | |
ac7eb8a3 | 356 | td->version[i] = 0; |
932394ac WD |
357 | td->pages[i] = -1; |
358 | /* Scan the maximum number of blocks */ | |
359 | for (block = 0; block < td->maxblocks; block++) { | |
360 | int actblock = startblock + dir * block; | |
361 | /* Read first page */ | |
ac7eb8a3 | 362 | nand_read_raw (mtd, buf, actblock << this->bbt_erase_shift, mtd->oobblock, mtd->oobsize); |
932394ac WD |
363 | if (!check_pattern(buf, scanlen, mtd->oobblock, td)) { |
364 | td->pages[i] = actblock << (this->bbt_erase_shift - this->page_shift); | |
365 | if (td->options & NAND_BBT_VERSION) { | |
366 | td->version[i] = buf[mtd->oobblock + td->veroffs]; | |
367 | } | |
368 | break; | |
369 | } | |
370 | } | |
371 | startblock += this->chipsize >> this->bbt_erase_shift; | |
372 | } | |
373 | /* Check, if we found a bbt for each requested chip */ | |
374 | for (i = 0; i < chips; i++) { | |
375 | if (td->pages[i] == -1) | |
376 | printk (KERN_WARNING "Bad block table not found for chip %d\n", i); | |
377 | else | |
378 | printk (KERN_DEBUG "Bad block table found at page %d, version 0x%02X\n", td->pages[i], td->version[i]); | |
379 | } | |
ac7eb8a3 | 380 | return 0; |
932394ac WD |
381 | } |
382 | ||
383 | /** | |
384 | * search_read_bbts - [GENERIC] scan the device for bad block table(s) | |
385 | * @mtd: MTD device structure | |
386 | * @buf: temporary buffer | |
ac7eb8a3 | 387 | * @td: descriptor for the bad block table |
932394ac WD |
388 | * @md: descriptor for the bad block table mirror |
389 | * | |
390 | * Search and read the bad block table(s) | |
391 | */ | |
ac7eb8a3 | 392 | static int search_read_bbts (struct mtd_info *mtd, uint8_t *buf, |
932394ac WD |
393 | struct nand_bbt_descr *td, struct nand_bbt_descr *md) |
394 | { | |
395 | /* Search the primary table */ | |
396 | search_bbt (mtd, buf, td); | |
ac7eb8a3 | 397 | |
932394ac WD |
398 | /* Search the mirror table */ |
399 | if (md) | |
400 | search_bbt (mtd, buf, md); | |
ac7eb8a3 | 401 | |
932394ac | 402 | /* Force result check */ |
ac7eb8a3 | 403 | return 1; |
932394ac | 404 | } |
932394ac | 405 | |
ac7eb8a3 WD |
406 | |
407 | /** | |
932394ac WD |
408 | * write_bbt - [GENERIC] (Re)write the bad block table |
409 | * | |
410 | * @mtd: MTD device structure | |
411 | * @buf: temporary buffer | |
ac7eb8a3 | 412 | * @td: descriptor for the bad block table |
932394ac WD |
413 | * @md: descriptor for the bad block table mirror |
414 | * @chipsel: selector for a specific chip, -1 for all | |
415 | * | |
416 | * (Re)write the bad block table | |
417 | * | |
418 | */ | |
ac7eb8a3 | 419 | static int write_bbt (struct mtd_info *mtd, uint8_t *buf, |
932394ac WD |
420 | struct nand_bbt_descr *td, struct nand_bbt_descr *md, int chipsel) |
421 | { | |
422 | struct nand_chip *this = mtd->priv; | |
423 | struct nand_oobinfo oobinfo; | |
424 | struct erase_info einfo; | |
425 | int i, j, res, chip = 0; | |
426 | int bits, startblock, dir, page, offs, numblocks, sft, sftmsk; | |
427 | int nrchips, bbtoffs, pageoffs; | |
428 | uint8_t msk[4]; | |
429 | uint8_t rcode = td->reserved_block_code; | |
430 | size_t retlen, len = 0; | |
431 | loff_t to; | |
432 | ||
433 | if (!rcode) | |
434 | rcode = 0xff; | |
435 | /* Write bad block table per chip rather than per device ? */ | |
436 | if (td->options & NAND_BBT_PERCHIP) { | |
437 | numblocks = (int) (this->chipsize >> this->bbt_erase_shift); | |
ac7eb8a3 | 438 | /* Full device write or specific chip ? */ |
932394ac WD |
439 | if (chipsel == -1) { |
440 | nrchips = this->numchips; | |
441 | } else { | |
442 | nrchips = chipsel + 1; | |
443 | chip = chipsel; | |
444 | } | |
445 | } else { | |
446 | numblocks = (int) (mtd->size >> this->bbt_erase_shift); | |
447 | nrchips = 1; | |
ac7eb8a3 WD |
448 | } |
449 | ||
932394ac WD |
450 | /* Loop through the chips */ |
451 | for (; chip < nrchips; chip++) { | |
ac7eb8a3 WD |
452 | |
453 | /* There was already a version of the table, reuse the page | |
454 | * This applies for absolute placement too, as we have the | |
932394ac WD |
455 | * page nr. in td->pages. |
456 | */ | |
457 | if (td->pages[chip] != -1) { | |
458 | page = td->pages[chip]; | |
459 | goto write; | |
ac7eb8a3 | 460 | } |
932394ac WD |
461 | |
462 | /* Automatic placement of the bad block table */ | |
463 | /* Search direction top -> down ? */ | |
464 | if (td->options & NAND_BBT_LASTBLOCK) { | |
465 | startblock = numblocks * (chip + 1) - 1; | |
466 | dir = -1; | |
467 | } else { | |
468 | startblock = chip * numblocks; | |
469 | dir = 1; | |
ac7eb8a3 | 470 | } |
932394ac WD |
471 | |
472 | for (i = 0; i < td->maxblocks; i++) { | |
473 | int block = startblock + dir * i; | |
474 | /* Check, if the block is bad */ | |
475 | switch ((this->bbt[block >> 2] >> (2 * (block & 0x03))) & 0x03) { | |
476 | case 0x01: | |
477 | case 0x03: | |
478 | continue; | |
479 | } | |
480 | page = block << (this->bbt_erase_shift - this->page_shift); | |
481 | /* Check, if the block is used by the mirror table */ | |
482 | if (!md || md->pages[chip] != page) | |
483 | goto write; | |
484 | } | |
485 | printk (KERN_ERR "No space left to write bad block table\n"); | |
486 | return -ENOSPC; | |
ac7eb8a3 | 487 | write: |
932394ac WD |
488 | |
489 | /* Set up shift count and masks for the flash table */ | |
490 | bits = td->options & NAND_BBT_NRBITS_MSK; | |
491 | switch (bits) { | |
492 | case 1: sft = 3; sftmsk = 0x07; msk[0] = 0x00; msk[1] = 0x01; msk[2] = ~rcode; msk[3] = 0x01; break; | |
493 | case 2: sft = 2; sftmsk = 0x06; msk[0] = 0x00; msk[1] = 0x01; msk[2] = ~rcode; msk[3] = 0x03; break; | |
494 | case 4: sft = 1; sftmsk = 0x04; msk[0] = 0x00; msk[1] = 0x0C; msk[2] = ~rcode; msk[3] = 0x0f; break; | |
495 | case 8: sft = 0; sftmsk = 0x00; msk[0] = 0x00; msk[1] = 0x0F; msk[2] = ~rcode; msk[3] = 0xff; break; | |
496 | default: return -EINVAL; | |
497 | } | |
ac7eb8a3 | 498 | |
932394ac | 499 | bbtoffs = chip * (numblocks >> 2); |
ac7eb8a3 | 500 | |
932394ac WD |
501 | to = ((loff_t) page) << this->page_shift; |
502 | ||
503 | memcpy (&oobinfo, this->autooob, sizeof(oobinfo)); | |
504 | oobinfo.useecc = MTD_NANDECC_PLACEONLY; | |
ac7eb8a3 | 505 | |
932394ac WD |
506 | /* Must we save the block contents ? */ |
507 | if (td->options & NAND_BBT_SAVECONTENT) { | |
508 | /* Make it block aligned */ | |
509 | to &= ~((loff_t) ((1 << this->bbt_erase_shift) - 1)); | |
510 | len = 1 << this->bbt_erase_shift; | |
511 | res = mtd->read_ecc (mtd, to, len, &retlen, buf, &buf[len], &oobinfo); | |
512 | if (res < 0) { | |
513 | if (retlen != len) { | |
514 | printk (KERN_INFO "nand_bbt: Error reading block for writing the bad block table\n"); | |
515 | return res; | |
516 | } | |
517 | printk (KERN_WARNING "nand_bbt: ECC error while reading block for writing bad block table\n"); | |
518 | } | |
519 | /* Calc the byte offset in the buffer */ | |
520 | pageoffs = page - (int)(to >> this->page_shift); | |
521 | offs = pageoffs << this->page_shift; | |
522 | /* Preset the bbt area with 0xff */ | |
523 | memset (&buf[offs], 0xff, (size_t)(numblocks >> sft)); | |
524 | /* Preset the bbt's oob area with 0xff */ | |
525 | memset (&buf[len + pageoffs * mtd->oobsize], 0xff, | |
526 | ((len >> this->page_shift) - pageoffs) * mtd->oobsize); | |
527 | if (td->options & NAND_BBT_VERSION) { | |
528 | buf[len + (pageoffs * mtd->oobsize) + td->veroffs] = td->version[chip]; | |
529 | } | |
530 | } else { | |
531 | /* Calc length */ | |
532 | len = (size_t) (numblocks >> sft); | |
533 | /* Make it page aligned ! */ | |
534 | len = (len + (mtd->oobblock-1)) & ~(mtd->oobblock-1); | |
535 | /* Preset the buffer with 0xff */ | |
536 | memset (buf, 0xff, len + (len >> this->page_shift) * mtd->oobsize); | |
537 | offs = 0; | |
538 | /* Pattern is located in oob area of first page */ | |
539 | memcpy (&buf[len + td->offs], td->pattern, td->len); | |
540 | if (td->options & NAND_BBT_VERSION) { | |
541 | buf[len + td->veroffs] = td->version[chip]; | |
542 | } | |
543 | } | |
ac7eb8a3 | 544 | |
932394ac WD |
545 | /* walk through the memory table */ |
546 | for (i = 0; i < numblocks; ) { | |
547 | uint8_t dat; | |
548 | dat = this->bbt[bbtoffs + (i >> 2)]; | |
549 | for (j = 0; j < 4; j++ , i++) { | |
550 | int sftcnt = (i << (3 - sft)) & sftmsk; | |
551 | /* Do not store the reserved bbt blocks ! */ | |
552 | buf[offs + (i >> sft)] &= ~(msk[dat & 0x03] << sftcnt); | |
553 | dat >>= 2; | |
554 | } | |
555 | } | |
ac7eb8a3 | 556 | |
932394ac WD |
557 | memset (&einfo, 0, sizeof (einfo)); |
558 | einfo.mtd = mtd; | |
559 | einfo.addr = (unsigned long) to; | |
560 | einfo.len = 1 << this->bbt_erase_shift; | |
561 | res = nand_erase_nand (mtd, &einfo, 1); | |
562 | if (res < 0) { | |
563 | printk (KERN_WARNING "nand_bbt: Error during block erase: %d\n", res); | |
564 | return res; | |
565 | } | |
ac7eb8a3 | 566 | |
932394ac WD |
567 | res = mtd->write_ecc (mtd, to, len, &retlen, buf, &buf[len], &oobinfo); |
568 | if (res < 0) { | |
569 | printk (KERN_WARNING "nand_bbt: Error while writing bad block table %d\n", res); | |
570 | return res; | |
571 | } | |
ac7eb8a3 | 572 | printk (KERN_DEBUG "Bad block table written to 0x%08x, version 0x%02X\n", |
932394ac | 573 | (unsigned int) to, td->version[chip]); |
ac7eb8a3 | 574 | |
932394ac WD |
575 | /* Mark it as used */ |
576 | td->pages[chip] = page; | |
ac7eb8a3 | 577 | } |
932394ac WD |
578 | return 0; |
579 | } | |
580 | ||
581 | /** | |
582 | * nand_memory_bbt - [GENERIC] create a memory based bad block table | |
583 | * @mtd: MTD device structure | |
584 | * @bd: descriptor for the good/bad block search pattern | |
585 | * | |
ac7eb8a3 | 586 | * The function creates a memory based bbt by scanning the device |
932394ac WD |
587 | * for manufacturer / software marked good / bad blocks |
588 | */ | |
589 | static int nand_memory_bbt (struct mtd_info *mtd, struct nand_bbt_descr *bd) | |
590 | { | |
591 | struct nand_chip *this = mtd->priv; | |
592 | ||
593 | /* Ensure that we only scan for the pattern and nothing else */ | |
594 | bd->options = 0; | |
595 | create_bbt (mtd, this->data_buf, bd, -1); | |
596 | return 0; | |
597 | } | |
598 | ||
599 | /** | |
600 | * check_create - [GENERIC] create and write bbt(s) if neccecary | |
601 | * @mtd: MTD device structure | |
602 | * @buf: temporary buffer | |
603 | * @bd: descriptor for the good/bad block search pattern | |
604 | * | |
605 | * The function checks the results of the previous call to read_bbt | |
606 | * and creates / updates the bbt(s) if neccecary | |
607 | * Creation is neccecary if no bbt was found for the chip/device | |
608 | * Update is neccecary if one of the tables is missing or the | |
609 | * version nr. of one table is less than the other | |
610 | */ | |
611 | static int check_create (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *bd) | |
612 | { | |
613 | int i, chips, writeops, chipsel, res; | |
614 | struct nand_chip *this = mtd->priv; | |
615 | struct nand_bbt_descr *td = this->bbt_td; | |
616 | struct nand_bbt_descr *md = this->bbt_md; | |
617 | struct nand_bbt_descr *rd, *rd2; | |
618 | ||
619 | /* Do we have a bbt per chip ? */ | |
ac7eb8a3 | 620 | if (td->options & NAND_BBT_PERCHIP) |
932394ac | 621 | chips = this->numchips; |
ac7eb8a3 | 622 | else |
932394ac | 623 | chips = 1; |
ac7eb8a3 | 624 | |
932394ac WD |
625 | for (i = 0; i < chips; i++) { |
626 | writeops = 0; | |
627 | rd = NULL; | |
628 | rd2 = NULL; | |
629 | /* Per chip or per device ? */ | |
630 | chipsel = (td->options & NAND_BBT_PERCHIP) ? i : -1; | |
631 | /* Mirrored table avilable ? */ | |
632 | if (md) { | |
633 | if (td->pages[i] == -1 && md->pages[i] == -1) { | |
634 | writeops = 0x03; | |
635 | goto create; | |
636 | } | |
637 | ||
638 | if (td->pages[i] == -1) { | |
ac7eb8a3 | 639 | rd = md; |
932394ac WD |
640 | td->version[i] = md->version[i]; |
641 | writeops = 1; | |
642 | goto writecheck; | |
643 | } | |
644 | ||
645 | if (md->pages[i] == -1) { | |
646 | rd = td; | |
647 | md->version[i] = td->version[i]; | |
648 | writeops = 2; | |
649 | goto writecheck; | |
650 | } | |
651 | ||
652 | if (td->version[i] == md->version[i]) { | |
653 | rd = td; | |
654 | if (!(td->options & NAND_BBT_VERSION)) | |
655 | rd2 = md; | |
656 | goto writecheck; | |
ac7eb8a3 | 657 | } |
932394ac WD |
658 | |
659 | if (((int8_t) (td->version[i] - md->version[i])) > 0) { | |
660 | rd = td; | |
661 | md->version[i] = td->version[i]; | |
662 | writeops = 2; | |
663 | } else { | |
664 | rd = md; | |
665 | td->version[i] = md->version[i]; | |
666 | writeops = 1; | |
667 | } | |
668 | ||
669 | goto writecheck; | |
670 | ||
671 | } else { | |
672 | if (td->pages[i] == -1) { | |
673 | writeops = 0x01; | |
674 | goto create; | |
675 | } | |
676 | rd = td; | |
677 | goto writecheck; | |
678 | } | |
679 | create: | |
680 | /* Create the bad block table by scanning the device ? */ | |
681 | if (!(td->options & NAND_BBT_CREATE)) | |
ac7eb8a3 WD |
682 | continue; |
683 | ||
932394ac WD |
684 | /* Create the table in memory by scanning the chip(s) */ |
685 | create_bbt (mtd, buf, bd, chipsel); | |
ac7eb8a3 | 686 | |
932394ac WD |
687 | td->version[i] = 1; |
688 | if (md) | |
ac7eb8a3 WD |
689 | md->version[i] = 1; |
690 | writecheck: | |
932394ac WD |
691 | /* read back first ? */ |
692 | if (rd) | |
693 | read_abs_bbt (mtd, buf, rd, chipsel); | |
694 | /* If they weren't versioned, read both. */ | |
695 | if (rd2) | |
696 | read_abs_bbt (mtd, buf, rd2, chipsel); | |
697 | ||
698 | /* Write the bad block table to the device ? */ | |
699 | if ((writeops & 0x01) && (td->options & NAND_BBT_WRITE)) { | |
700 | res = write_bbt (mtd, buf, td, md, chipsel); | |
701 | if (res < 0) | |
702 | return res; | |
703 | } | |
ac7eb8a3 | 704 | |
932394ac WD |
705 | /* Write the mirror bad block table to the device ? */ |
706 | if ((writeops & 0x02) && md && (md->options & NAND_BBT_WRITE)) { | |
707 | res = write_bbt (mtd, buf, md, td, chipsel); | |
708 | if (res < 0) | |
709 | return res; | |
710 | } | |
711 | } | |
ac7eb8a3 | 712 | return 0; |
932394ac WD |
713 | } |
714 | ||
715 | /** | |
ac7eb8a3 | 716 | * mark_bbt_regions - [GENERIC] mark the bad block table regions |
932394ac WD |
717 | * @mtd: MTD device structure |
718 | * @td: bad block table descriptor | |
719 | * | |
720 | * The bad block table regions are marked as "bad" to prevent | |
721 | * accidental erasures / writes. The regions are identified by | |
722 | * the mark 0x02. | |
723 | */ | |
724 | static void mark_bbt_region (struct mtd_info *mtd, struct nand_bbt_descr *td) | |
725 | { | |
726 | struct nand_chip *this = mtd->priv; | |
727 | int i, j, chips, block, nrblocks, update; | |
728 | uint8_t oldval, newval; | |
729 | ||
730 | /* Do we have a bbt per chip ? */ | |
731 | if (td->options & NAND_BBT_PERCHIP) { | |
732 | chips = this->numchips; | |
733 | nrblocks = (int)(this->chipsize >> this->bbt_erase_shift); | |
734 | } else { | |
735 | chips = 1; | |
736 | nrblocks = (int)(mtd->size >> this->bbt_erase_shift); | |
ac7eb8a3 WD |
737 | } |
738 | ||
932394ac WD |
739 | for (i = 0; i < chips; i++) { |
740 | if ((td->options & NAND_BBT_ABSPAGE) || | |
741 | !(td->options & NAND_BBT_WRITE)) { | |
742 | if (td->pages[i] == -1) continue; | |
743 | block = td->pages[i] >> (this->bbt_erase_shift - this->page_shift); | |
ac7eb8a3 | 744 | block <<= 1; |
932394ac WD |
745 | oldval = this->bbt[(block >> 3)]; |
746 | newval = oldval | (0x2 << (block & 0x06)); | |
747 | this->bbt[(block >> 3)] = newval; | |
748 | if ((oldval != newval) && td->reserved_block_code) | |
749 | nand_update_bbt(mtd, block << (this->bbt_erase_shift - 1)); | |
750 | continue; | |
751 | } | |
752 | update = 0; | |
753 | if (td->options & NAND_BBT_LASTBLOCK) | |
754 | block = ((i + 1) * nrblocks) - td->maxblocks; | |
ac7eb8a3 | 755 | else |
932394ac | 756 | block = i * nrblocks; |
ac7eb8a3 | 757 | block <<= 1; |
932394ac WD |
758 | for (j = 0; j < td->maxblocks; j++) { |
759 | oldval = this->bbt[(block >> 3)]; | |
760 | newval = oldval | (0x2 << (block & 0x06)); | |
761 | this->bbt[(block >> 3)] = newval; | |
762 | if (oldval != newval) update = 1; | |
763 | block += 2; | |
ac7eb8a3 | 764 | } |
932394ac WD |
765 | /* If we want reserved blocks to be recorded to flash, and some |
766 | new ones have been marked, then we need to update the stored | |
767 | bbts. This should only happen once. */ | |
768 | if (update && td->reserved_block_code) | |
769 | nand_update_bbt(mtd, (block - 2) << (this->bbt_erase_shift - 1)); | |
770 | } | |
771 | } | |
772 | ||
773 | /** | |
774 | * nand_scan_bbt - [NAND Interface] scan, find, read and maybe create bad block table(s) | |
775 | * @mtd: MTD device structure | |
776 | * @bd: descriptor for the good/bad block search pattern | |
777 | * | |
ac7eb8a3 | 778 | * The function checks, if a bad block table(s) is/are already |
932394ac WD |
779 | * available. If not it scans the device for manufacturer |
780 | * marked good / bad blocks and writes the bad block table(s) to | |
781 | * the selected place. | |
782 | * | |
783 | * The bad block table memory is allocated here. It must be freed | |
784 | * by calling the nand_free_bbt function. | |
785 | * | |
786 | */ | |
787 | int nand_scan_bbt (struct mtd_info *mtd, struct nand_bbt_descr *bd) | |
788 | { | |
789 | struct nand_chip *this = mtd->priv; | |
790 | int len, res = 0; | |
791 | uint8_t *buf; | |
792 | struct nand_bbt_descr *td = this->bbt_td; | |
793 | struct nand_bbt_descr *md = this->bbt_md; | |
794 | ||
795 | len = mtd->size >> (this->bbt_erase_shift + 2); | |
796 | /* Allocate memory (2bit per block) */ | |
797 | this->bbt = kmalloc (len, GFP_KERNEL); | |
798 | if (!this->bbt) { | |
799 | printk (KERN_ERR "nand_scan_bbt: Out of memory\n"); | |
800 | return -ENOMEM; | |
801 | } | |
802 | /* Clear the memory bad block table */ | |
803 | memset (this->bbt, 0x00, len); | |
804 | ||
805 | /* If no primary table decriptor is given, scan the device | |
806 | * to build a memory based bad block table | |
807 | */ | |
808 | if (!td) | |
809 | return nand_memory_bbt(mtd, bd); | |
810 | ||
811 | /* Allocate a temporary buffer for one eraseblock incl. oob */ | |
812 | len = (1 << this->bbt_erase_shift); | |
813 | len += (len >> this->page_shift) * mtd->oobsize; | |
814 | buf = kmalloc (len, GFP_KERNEL); | |
815 | if (!buf) { | |
816 | printk (KERN_ERR "nand_bbt: Out of memory\n"); | |
817 | kfree (this->bbt); | |
818 | this->bbt = NULL; | |
819 | return -ENOMEM; | |
820 | } | |
ac7eb8a3 | 821 | |
932394ac WD |
822 | /* Is the bbt at a given page ? */ |
823 | if (td->options & NAND_BBT_ABSPAGE) { | |
824 | res = read_abs_bbts (mtd, buf, td, md); | |
ac7eb8a3 | 825 | } else { |
932394ac WD |
826 | /* Search the bad block table using a pattern in oob */ |
827 | res = search_read_bbts (mtd, buf, td, md); | |
ac7eb8a3 | 828 | } |
932394ac | 829 | |
ac7eb8a3 | 830 | if (res) |
932394ac | 831 | res = check_create (mtd, buf, bd); |
ac7eb8a3 | 832 | |
932394ac WD |
833 | /* Prevent the bbt regions from erasing / writing */ |
834 | mark_bbt_region (mtd, td); | |
835 | if (md) | |
836 | mark_bbt_region (mtd, md); | |
ac7eb8a3 | 837 | |
932394ac WD |
838 | kfree (buf); |
839 | return res; | |
840 | } | |
841 | ||
842 | ||
843 | /** | |
ac7eb8a3 | 844 | * nand_update_bbt - [NAND Interface] update bad block table(s) |
932394ac WD |
845 | * @mtd: MTD device structure |
846 | * @offs: the offset of the newly marked block | |
847 | * | |
848 | * The function updates the bad block table(s) | |
849 | */ | |
850 | int nand_update_bbt (struct mtd_info *mtd, loff_t offs) | |
851 | { | |
852 | struct nand_chip *this = mtd->priv; | |
853 | int len, res = 0, writeops = 0; | |
854 | int chip, chipsel; | |
855 | uint8_t *buf; | |
856 | struct nand_bbt_descr *td = this->bbt_td; | |
857 | struct nand_bbt_descr *md = this->bbt_md; | |
858 | ||
859 | if (!this->bbt || !td) | |
860 | return -EINVAL; | |
861 | ||
862 | len = mtd->size >> (this->bbt_erase_shift + 2); | |
863 | /* Allocate a temporary buffer for one eraseblock incl. oob */ | |
864 | len = (1 << this->bbt_erase_shift); | |
865 | len += (len >> this->page_shift) * mtd->oobsize; | |
866 | buf = kmalloc (len, GFP_KERNEL); | |
867 | if (!buf) { | |
868 | printk (KERN_ERR "nand_update_bbt: Out of memory\n"); | |
869 | return -ENOMEM; | |
870 | } | |
ac7eb8a3 | 871 | |
932394ac WD |
872 | writeops = md != NULL ? 0x03 : 0x01; |
873 | ||
874 | /* Do we have a bbt per chip ? */ | |
875 | if (td->options & NAND_BBT_PERCHIP) { | |
876 | chip = (int) (offs >> this->chip_shift); | |
877 | chipsel = chip; | |
878 | } else { | |
879 | chip = 0; | |
880 | chipsel = -1; | |
881 | } | |
882 | ||
883 | td->version[chip]++; | |
884 | if (md) | |
ac7eb8a3 | 885 | md->version[chip]++; |
932394ac WD |
886 | |
887 | /* Write the bad block table to the device ? */ | |
888 | if ((writeops & 0x01) && (td->options & NAND_BBT_WRITE)) { | |
889 | res = write_bbt (mtd, buf, td, md, chipsel); | |
890 | if (res < 0) | |
891 | goto out; | |
892 | } | |
893 | /* Write the mirror bad block table to the device ? */ | |
894 | if ((writeops & 0x02) && md && (md->options & NAND_BBT_WRITE)) { | |
895 | res = write_bbt (mtd, buf, md, td, chipsel); | |
896 | } | |
897 | ||
ac7eb8a3 | 898 | out: |
932394ac WD |
899 | kfree (buf); |
900 | return res; | |
901 | } | |
902 | ||
ac7eb8a3 | 903 | /* Define some generic bad / good block scan pattern which are used |
932394ac | 904 | * while scanning a device for factory marked good / bad blocks |
ac7eb8a3 WD |
905 | * |
906 | * The memory based patterns just | |
932394ac WD |
907 | */ |
908 | static uint8_t scan_ff_pattern[] = { 0xff, 0xff }; | |
909 | ||
910 | static struct nand_bbt_descr smallpage_memorybased = { | |
911 | .options = 0, | |
912 | .offs = 5, | |
913 | .len = 1, | |
914 | .pattern = scan_ff_pattern | |
915 | }; | |
916 | ||
917 | static struct nand_bbt_descr largepage_memorybased = { | |
918 | .options = 0, | |
919 | .offs = 0, | |
920 | .len = 2, | |
921 | .pattern = scan_ff_pattern | |
922 | }; | |
923 | ||
924 | static struct nand_bbt_descr smallpage_flashbased = { | |
925 | .options = NAND_BBT_SCANEMPTY | NAND_BBT_SCANALLPAGES, | |
926 | .offs = 5, | |
927 | .len = 1, | |
928 | .pattern = scan_ff_pattern | |
929 | }; | |
930 | ||
931 | static struct nand_bbt_descr largepage_flashbased = { | |
932 | .options = NAND_BBT_SCANEMPTY | NAND_BBT_SCANALLPAGES, | |
933 | .offs = 0, | |
934 | .len = 2, | |
935 | .pattern = scan_ff_pattern | |
936 | }; | |
937 | ||
938 | static uint8_t scan_agand_pattern[] = { 0x1C, 0x71, 0xC7, 0x1C, 0x71, 0xC7 }; | |
939 | ||
940 | static struct nand_bbt_descr agand_flashbased = { | |
941 | .options = NAND_BBT_SCANEMPTY | NAND_BBT_SCANALLPAGES, | |
942 | .offs = 0x20, | |
943 | .len = 6, | |
944 | .pattern = scan_agand_pattern | |
945 | }; | |
946 | ||
947 | /* Generic flash bbt decriptors | |
948 | */ | |
949 | static uint8_t bbt_pattern[] = {'B', 'b', 't', '0' }; | |
950 | static uint8_t mirror_pattern[] = {'1', 't', 'b', 'B' }; | |
951 | ||
952 | static struct nand_bbt_descr bbt_main_descr = { | |
ac7eb8a3 | 953 | .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
932394ac WD |
954 | | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP, |
955 | .offs = 8, | |
956 | .len = 4, | |
957 | .veroffs = 12, | |
958 | .maxblocks = 4, | |
959 | .pattern = bbt_pattern | |
960 | }; | |
961 | ||
962 | static struct nand_bbt_descr bbt_mirror_descr = { | |
ac7eb8a3 | 963 | .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
932394ac WD |
964 | | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP, |
965 | .offs = 8, | |
966 | .len = 4, | |
967 | .veroffs = 12, | |
968 | .maxblocks = 4, | |
969 | .pattern = mirror_pattern | |
970 | }; | |
971 | ||
972 | /** | |
ac7eb8a3 | 973 | * nand_default_bbt - [NAND Interface] Select a default bad block table for the device |
932394ac WD |
974 | * @mtd: MTD device structure |
975 | * | |
976 | * This function selects the default bad block table | |
977 | * support for the device and calls the nand_scan_bbt function | |
978 | * | |
979 | */ | |
980 | int nand_default_bbt (struct mtd_info *mtd) | |
981 | { | |
982 | struct nand_chip *this = mtd->priv; | |
ac7eb8a3 WD |
983 | |
984 | /* Default for AG-AND. We must use a flash based | |
932394ac WD |
985 | * bad block table as the devices have factory marked |
986 | * _good_ blocks. Erasing those blocks leads to loss | |
987 | * of the good / bad information, so we _must_ store | |
ac7eb8a3 | 988 | * this information in a good / bad table during |
932394ac WD |
989 | * startup |
990 | */ | |
991 | if (this->options & NAND_IS_AND) { | |
992 | /* Use the default pattern descriptors */ | |
ac7eb8a3 | 993 | if (!this->bbt_td) { |
932394ac WD |
994 | this->bbt_td = &bbt_main_descr; |
995 | this->bbt_md = &bbt_mirror_descr; | |
ac7eb8a3 | 996 | } |
932394ac WD |
997 | this->options |= NAND_USE_FLASH_BBT; |
998 | return nand_scan_bbt (mtd, &agand_flashbased); | |
999 | } | |
ac7eb8a3 WD |
1000 | |
1001 | ||
932394ac WD |
1002 | /* Is a flash based bad block table requested ? */ |
1003 | if (this->options & NAND_USE_FLASH_BBT) { | |
ac7eb8a3 WD |
1004 | /* Use the default pattern descriptors */ |
1005 | if (!this->bbt_td) { | |
932394ac WD |
1006 | this->bbt_td = &bbt_main_descr; |
1007 | this->bbt_md = &bbt_mirror_descr; | |
1008 | } | |
1009 | if (!this->badblock_pattern) { | |
1010 | this->badblock_pattern = (mtd->oobblock > 512) ? | |
1011 | &largepage_flashbased : &smallpage_flashbased; | |
1012 | } | |
1013 | } else { | |
1014 | this->bbt_td = NULL; | |
1015 | this->bbt_md = NULL; | |
1016 | if (!this->badblock_pattern) { | |
1017 | this->badblock_pattern = (mtd->oobblock > 512) ? | |
1018 | &largepage_memorybased : &smallpage_memorybased; | |
1019 | } | |
1020 | } | |
1021 | return nand_scan_bbt (mtd, this->badblock_pattern); | |
1022 | } | |
1023 | ||
1024 | /** | |
ac7eb8a3 | 1025 | * nand_isbad_bbt - [NAND Interface] Check if a block is bad |
932394ac WD |
1026 | * @mtd: MTD device structure |
1027 | * @offs: offset in the device | |
1028 | * @allowbbt: allow access to bad block table region | |
1029 | * | |
ac7eb8a3 | 1030 | */ |
932394ac WD |
1031 | int nand_isbad_bbt (struct mtd_info *mtd, loff_t offs, int allowbbt) |
1032 | { | |
1033 | struct nand_chip *this = mtd->priv; | |
1034 | int block; | |
1035 | uint8_t res; | |
ac7eb8a3 | 1036 | |
932394ac WD |
1037 | /* Get block number * 2 */ |
1038 | block = (int) (offs >> (this->bbt_erase_shift - 1)); | |
1039 | res = (this->bbt[block >> 3] >> (block & 0x06)) & 0x03; | |
1040 | ||
ac7eb8a3 | 1041 | DEBUG (MTD_DEBUG_LEVEL2, "nand_isbad_bbt(): bbt info for offs 0x%08x: (block %d) 0x%02x\n", |
932394ac WD |
1042 | (unsigned int)offs, res, block >> 1); |
1043 | ||
1044 | switch ((int)res) { | |
1045 | case 0x00: return 0; | |
1046 | case 0x01: return 1; | |
1047 | case 0x02: return allowbbt ? 0 : 1; | |
1048 | } | |
1049 | return 1; | |
1050 | } | |
1051 | ||
1052 | #endif |