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24 | * If one of the bbt's is out of date or does not exist it is (re)created.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