Commit | Line | Data |
---|---|---|
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24 | * If one of the bbt's is out of date or does not exist it is (re)created.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 DW |
158 | len = min(totlen, (size_t) (1 << this->bbt_erase_shift)); |
159 | res = mtd->read_ecc(mtd, from, len, &retlen, buf, NULL, this->autooob); | |
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 LT |
178 | this->bbt[offs + (act >> 3)] |= 0x2 << (act & 0x06); |
179 | continue; | |
180 | } | |
181 | /* Leave it for now, if its matured we can move this | |
182 | * message to MTD_DEBUG_LEVEL0 */ | |
e0c7d767 DW |
183 | printk(KERN_DEBUG "nand_read_bbt: Bad block at 0x%08x\n", |
184 | ((offs << 2) + (act >> 1)) << this->bbt_erase_shift); | |
61b03bd7 | 185 | /* Factory marked bad or worn out ? */ |
1da177e4 LT |
186 | if (tmp == 0) |
187 | this->bbt[offs + (act >> 3)] |= 0x3 << (act & 0x06); | |
188 | else | |
189 | this->bbt[offs + (act >> 3)] |= 0x1 << (act & 0x06); | |
61b03bd7 | 190 | } |
1da177e4 LT |
191 | } |
192 | totlen -= len; | |
193 | from += len; | |
194 | } | |
195 | return 0; | |
196 | } | |
197 | ||
198 | /** | |
199 | * read_abs_bbt - [GENERIC] Read the bad block table starting at a given page | |
200 | * @mtd: MTD device structure | |
201 | * @buf: temporary buffer | |
61b03bd7 | 202 | * @td: descriptor for the bad block table |
1da177e4 LT |
203 | * @chip: read the table for a specific chip, -1 read all chips. |
204 | * Applies only if NAND_BBT_PERCHIP option is set | |
205 | * | |
206 | * Read the bad block table for all chips starting at a given page | |
207 | * We assume that the bbt bits are in consecutive order. | |
208 | */ | |
e0c7d767 | 209 | static int read_abs_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td, int chip) |
1da177e4 LT |
210 | { |
211 | struct nand_chip *this = mtd->priv; | |
212 | int res = 0, i; | |
213 | int bits; | |
214 | ||
215 | bits = td->options & NAND_BBT_NRBITS_MSK; | |
216 | if (td->options & NAND_BBT_PERCHIP) { | |
217 | int offs = 0; | |
218 | for (i = 0; i < this->numchips; i++) { | |
219 | if (chip == -1 || chip == i) | |
220 | res = read_bbt (mtd, buf, td->pages[i], this->chipsize >> this->bbt_erase_shift, bits, offs, td->reserved_block_code); | |
221 | if (res) | |
222 | return res; | |
223 | offs += this->chipsize >> (this->bbt_erase_shift + 2); | |
224 | } | |
225 | } else { | |
226 | res = read_bbt (mtd, buf, td->pages[0], mtd->size >> this->bbt_erase_shift, bits, 0, td->reserved_block_code); | |
227 | if (res) | |
228 | return res; | |
229 | } | |
230 | return 0; | |
231 | } | |
232 | ||
233 | /** | |
234 | * read_abs_bbts - [GENERIC] Read the bad block table(s) for all chips starting at a given page | |
235 | * @mtd: MTD device structure | |
236 | * @buf: temporary buffer | |
61b03bd7 | 237 | * @td: descriptor for the bad block table |
1da177e4 LT |
238 | * @md: descriptor for the bad block table mirror |
239 | * | |
240 | * Read the bad block table(s) for all chips starting at a given page | |
241 | * We assume that the bbt bits are in consecutive order. | |
242 | * | |
243 | */ | |
e0c7d767 | 244 | static int read_abs_bbts(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td, struct nand_bbt_descr *md) |
1da177e4 LT |
245 | { |
246 | struct nand_chip *this = mtd->priv; | |
247 | ||
61b03bd7 | 248 | /* Read the primary version, if available */ |
1da177e4 | 249 | if (td->options & NAND_BBT_VERSION) { |
e0c7d767 | 250 | nand_read_raw(mtd, buf, td->pages[0] << this->page_shift, mtd->oobblock, mtd->oobsize); |
1da177e4 | 251 | td->version[0] = buf[mtd->oobblock + td->veroffs]; |
e0c7d767 | 252 | printk(KERN_DEBUG "Bad block table at page %d, version 0x%02X\n", td->pages[0], td->version[0]); |
1da177e4 LT |
253 | } |
254 | ||
61b03bd7 | 255 | /* Read the mirror version, if available */ |
1da177e4 | 256 | if (md && (md->options & NAND_BBT_VERSION)) { |
e0c7d767 | 257 | nand_read_raw(mtd, buf, md->pages[0] << this->page_shift, mtd->oobblock, mtd->oobsize); |
1da177e4 | 258 | md->version[0] = buf[mtd->oobblock + md->veroffs]; |
e0c7d767 | 259 | printk(KERN_DEBUG "Bad block table at page %d, version 0x%02X\n", md->pages[0], md->version[0]); |
1da177e4 LT |
260 | } |
261 | ||
262 | return 1; | |
263 | } | |
264 | ||
265 | /** | |
266 | * create_bbt - [GENERIC] Create a bad block table by scanning the device | |
267 | * @mtd: MTD device structure | |
268 | * @buf: temporary buffer | |
269 | * @bd: descriptor for the good/bad block search pattern | |
270 | * @chip: create the table for a specific chip, -1 read all chips. | |
271 | * Applies only if NAND_BBT_PERCHIP option is set | |
272 | * | |
273 | * Create a bad block table by scanning the device | |
274 | * for the given good/bad block identify pattern | |
275 | */ | |
e0c7d767 | 276 | static int create_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *bd, int chip) |
1da177e4 LT |
277 | { |
278 | struct nand_chip *this = mtd->priv; | |
171650af | 279 | int i, j, numblocks, len, scanlen; |
1da177e4 LT |
280 | int startblock; |
281 | loff_t from; | |
282 | size_t readlen, ooblen; | |
283 | ||
e0c7d767 | 284 | printk(KERN_INFO "Scanning device for bad blocks\n"); |
1da177e4 LT |
285 | |
286 | if (bd->options & NAND_BBT_SCANALLPAGES) | |
287 | len = 1 << (this->bbt_erase_shift - this->page_shift); | |
288 | else { | |
289 | if (bd->options & NAND_BBT_SCAN2NDPAGE) | |
290 | len = 2; | |
61b03bd7 | 291 | else |
1da177e4 LT |
292 | len = 1; |
293 | } | |
171650af AB |
294 | |
295 | if (!(bd->options & NAND_BBT_SCANEMPTY)) { | |
296 | /* We need only read few bytes from the OOB area */ | |
297 | scanlen = ooblen = 0; | |
eeada24d AB |
298 | readlen = bd->len; |
299 | } else { | |
171650af | 300 | /* Full page content should be read */ |
e0c7d767 | 301 | scanlen = mtd->oobblock + mtd->oobsize; |
eeada24d AB |
302 | readlen = len * mtd->oobblock; |
303 | ooblen = len * mtd->oobsize; | |
eeada24d | 304 | } |
1da177e4 LT |
305 | |
306 | if (chip == -1) { | |
307 | /* Note that numblocks is 2 * (real numblocks) here, see i+=2 below as it | |
308 | * makes shifting and masking less painful */ | |
309 | numblocks = mtd->size >> (this->bbt_erase_shift - 1); | |
310 | startblock = 0; | |
311 | from = 0; | |
312 | } else { | |
313 | if (chip >= this->numchips) { | |
e0c7d767 DW |
314 | printk(KERN_WARNING "create_bbt(): chipnr (%d) > available chips (%d)\n", |
315 | chip + 1, this->numchips); | |
171650af | 316 | return -EINVAL; |
1da177e4 LT |
317 | } |
318 | numblocks = this->chipsize >> (this->bbt_erase_shift - 1); | |
319 | startblock = chip * numblocks; | |
320 | numblocks += startblock; | |
321 | from = startblock << (this->bbt_erase_shift - 1); | |
322 | } | |
61b03bd7 | 323 | |
1da177e4 | 324 | for (i = startblock; i < numblocks;) { |
eeada24d | 325 | int ret; |
61b03bd7 | 326 | |
171650af | 327 | if (bd->options & NAND_BBT_SCANEMPTY) |
e0c7d767 | 328 | if ((ret = nand_read_raw(mtd, buf, from, readlen, ooblen))) |
eeada24d | 329 | return ret; |
171650af | 330 | |
1da177e4 | 331 | for (j = 0; j < len; j++) { |
171650af AB |
332 | if (!(bd->options & NAND_BBT_SCANEMPTY)) { |
333 | size_t retlen; | |
61b03bd7 TG |
334 | |
335 | /* Read the full oob until read_oob is fixed to | |
19870da7 | 336 | * handle single byte reads for 16 bit buswidth */ |
e0c7d767 | 337 | ret = mtd->read_oob(mtd, from + j * mtd->oobblock, mtd->oobsize, &retlen, buf); |
171650af AB |
338 | if (ret) |
339 | return ret; | |
c9e05365 | 340 | |
e0c7d767 | 341 | if (check_short_pattern(buf, bd)) { |
c9e05365 | 342 | this->bbt[i >> 3] |= 0x03 << (i & 0x6); |
e0c7d767 DW |
343 | printk(KERN_WARNING "Bad eraseblock %d at 0x%08x\n", |
344 | i >> 1, (unsigned int)from); | |
c9e05365 TG |
345 | break; |
346 | } | |
347 | } else { | |
e0c7d767 | 348 | if (check_pattern(&buf[j * scanlen], scanlen, mtd->oobblock, bd)) { |
c9e05365 | 349 | this->bbt[i >> 3] |= 0x03 << (i & 0x6); |
e0c7d767 DW |
350 | printk(KERN_WARNING "Bad eraseblock %d at 0x%08x\n", |
351 | i >> 1, (unsigned int)from); | |
c9e05365 TG |
352 | break; |
353 | } | |
1da177e4 LT |
354 | } |
355 | } | |
356 | i += 2; | |
357 | from += (1 << this->bbt_erase_shift); | |
358 | } | |
eeada24d | 359 | return 0; |
1da177e4 LT |
360 | } |
361 | ||
362 | /** | |
363 | * search_bbt - [GENERIC] scan the device for a specific bad block table | |
364 | * @mtd: MTD device structure | |
365 | * @buf: temporary buffer | |
366 | * @td: descriptor for the bad block table | |
367 | * | |
368 | * Read the bad block table by searching for a given ident pattern. | |
61b03bd7 | 369 | * Search is preformed either from the beginning up or from the end of |
1da177e4 LT |
370 | * the device downwards. The search starts always at the start of a |
371 | * block. | |
61b03bd7 | 372 | * If the option NAND_BBT_PERCHIP is given, each chip is searched |
1da177e4 | 373 | * for a bbt, which contains the bad block information of this chip. |
e0c7d767 | 374 | * This is necessary to provide support for certain DOC devices. |
1da177e4 | 375 | * |
61b03bd7 TG |
376 | * The bbt ident pattern resides in the oob area of the first page |
377 | * in a block. | |
1da177e4 | 378 | */ |
e0c7d767 | 379 | static int search_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td) |
1da177e4 LT |
380 | { |
381 | struct nand_chip *this = mtd->priv; | |
382 | int i, chips; | |
383 | int bits, startblock, block, dir; | |
384 | int scanlen = mtd->oobblock + mtd->oobsize; | |
385 | int bbtblocks; | |
386 | ||
387 | /* Search direction top -> down ? */ | |
388 | if (td->options & NAND_BBT_LASTBLOCK) { | |
e0c7d767 | 389 | startblock = (mtd->size >> this->bbt_erase_shift) - 1; |
1da177e4 LT |
390 | dir = -1; |
391 | } else { | |
61b03bd7 | 392 | startblock = 0; |
1da177e4 | 393 | dir = 1; |
61b03bd7 TG |
394 | } |
395 | ||
1da177e4 LT |
396 | /* Do we have a bbt per chip ? */ |
397 | if (td->options & NAND_BBT_PERCHIP) { | |
398 | chips = this->numchips; | |
399 | bbtblocks = this->chipsize >> this->bbt_erase_shift; | |
400 | startblock &= bbtblocks - 1; | |
401 | } else { | |
402 | chips = 1; | |
403 | bbtblocks = mtd->size >> this->bbt_erase_shift; | |
404 | } | |
61b03bd7 | 405 | |
1da177e4 LT |
406 | /* Number of bits for each erase block in the bbt */ |
407 | bits = td->options & NAND_BBT_NRBITS_MSK; | |
61b03bd7 | 408 | |
1da177e4 LT |
409 | for (i = 0; i < chips; i++) { |
410 | /* Reset version information */ | |
61b03bd7 | 411 | td->version[i] = 0; |
1da177e4 LT |
412 | td->pages[i] = -1; |
413 | /* Scan the maximum number of blocks */ | |
414 | for (block = 0; block < td->maxblocks; block++) { | |
415 | int actblock = startblock + dir * block; | |
416 | /* Read first page */ | |
e0c7d767 | 417 | nand_read_raw(mtd, buf, actblock << this->bbt_erase_shift, mtd->oobblock, mtd->oobsize); |
1da177e4 LT |
418 | if (!check_pattern(buf, scanlen, mtd->oobblock, td)) { |
419 | td->pages[i] = actblock << (this->bbt_erase_shift - this->page_shift); | |
420 | if (td->options & NAND_BBT_VERSION) { | |
421 | td->version[i] = buf[mtd->oobblock + td->veroffs]; | |
422 | } | |
423 | break; | |
424 | } | |
425 | } | |
426 | startblock += this->chipsize >> this->bbt_erase_shift; | |
427 | } | |
428 | /* Check, if we found a bbt for each requested chip */ | |
429 | for (i = 0; i < chips; i++) { | |
430 | if (td->pages[i] == -1) | |
e0c7d767 | 431 | printk(KERN_WARNING "Bad block table not found for chip %d\n", i); |
1da177e4 | 432 | else |
e0c7d767 DW |
433 | printk(KERN_DEBUG "Bad block table found at page %d, version 0x%02X\n", td->pages[i], |
434 | td->version[i]); | |
1da177e4 | 435 | } |
61b03bd7 | 436 | return 0; |
1da177e4 LT |
437 | } |
438 | ||
439 | /** | |
440 | * search_read_bbts - [GENERIC] scan the device for bad block table(s) | |
441 | * @mtd: MTD device structure | |
442 | * @buf: temporary buffer | |
61b03bd7 | 443 | * @td: descriptor for the bad block table |
1da177e4 LT |
444 | * @md: descriptor for the bad block table mirror |
445 | * | |
446 | * Search and read the bad block table(s) | |
447 | */ | |
e0c7d767 | 448 | static int search_read_bbts(struct mtd_info *mtd, uint8_t * buf, struct nand_bbt_descr *td, struct nand_bbt_descr *md) |
1da177e4 LT |
449 | { |
450 | /* Search the primary table */ | |
e0c7d767 | 451 | search_bbt(mtd, buf, td); |
61b03bd7 | 452 | |
1da177e4 LT |
453 | /* Search the mirror table */ |
454 | if (md) | |
e0c7d767 | 455 | search_bbt(mtd, buf, md); |
61b03bd7 | 456 | |
1da177e4 | 457 | /* Force result check */ |
61b03bd7 | 458 | return 1; |
1da177e4 | 459 | } |
1da177e4 | 460 | |
61b03bd7 | 461 | /** |
1da177e4 LT |
462 | * write_bbt - [GENERIC] (Re)write the bad block table |
463 | * | |
464 | * @mtd: MTD device structure | |
465 | * @buf: temporary buffer | |
61b03bd7 | 466 | * @td: descriptor for the bad block table |
1da177e4 LT |
467 | * @md: descriptor for the bad block table mirror |
468 | * @chipsel: selector for a specific chip, -1 for all | |
469 | * | |
470 | * (Re)write the bad block table | |
471 | * | |
472 | */ | |
e0c7d767 DW |
473 | static int write_bbt(struct mtd_info *mtd, uint8_t *buf, |
474 | struct nand_bbt_descr *td, struct nand_bbt_descr *md, int chipsel) | |
1da177e4 LT |
475 | { |
476 | struct nand_chip *this = mtd->priv; | |
477 | struct nand_oobinfo oobinfo; | |
478 | struct erase_info einfo; | |
479 | int i, j, res, chip = 0; | |
480 | int bits, startblock, dir, page, offs, numblocks, sft, sftmsk; | |
481 | int nrchips, bbtoffs, pageoffs; | |
482 | uint8_t msk[4]; | |
483 | uint8_t rcode = td->reserved_block_code; | |
484 | size_t retlen, len = 0; | |
485 | loff_t to; | |
486 | ||
487 | if (!rcode) | |
488 | rcode = 0xff; | |
489 | /* Write bad block table per chip rather than per device ? */ | |
490 | if (td->options & NAND_BBT_PERCHIP) { | |
e0c7d767 | 491 | numblocks = (int)(this->chipsize >> this->bbt_erase_shift); |
61b03bd7 | 492 | /* Full device write or specific chip ? */ |
1da177e4 LT |
493 | if (chipsel == -1) { |
494 | nrchips = this->numchips; | |
495 | } else { | |
496 | nrchips = chipsel + 1; | |
497 | chip = chipsel; | |
498 | } | |
499 | } else { | |
e0c7d767 | 500 | numblocks = (int)(mtd->size >> this->bbt_erase_shift); |
1da177e4 | 501 | nrchips = 1; |
61b03bd7 TG |
502 | } |
503 | ||
1da177e4 LT |
504 | /* Loop through the chips */ |
505 | for (; chip < nrchips; chip++) { | |
61b03bd7 TG |
506 | |
507 | /* There was already a version of the table, reuse the page | |
508 | * This applies for absolute placement too, as we have the | |
1da177e4 LT |
509 | * page nr. in td->pages. |
510 | */ | |
511 | if (td->pages[chip] != -1) { | |
512 | page = td->pages[chip]; | |
513 | goto write; | |
61b03bd7 | 514 | } |
1da177e4 LT |
515 | |
516 | /* Automatic placement of the bad block table */ | |
517 | /* Search direction top -> down ? */ | |
518 | if (td->options & NAND_BBT_LASTBLOCK) { | |
519 | startblock = numblocks * (chip + 1) - 1; | |
520 | dir = -1; | |
521 | } else { | |
522 | startblock = chip * numblocks; | |
523 | dir = 1; | |
61b03bd7 | 524 | } |
1da177e4 LT |
525 | |
526 | for (i = 0; i < td->maxblocks; i++) { | |
527 | int block = startblock + dir * i; | |
528 | /* Check, if the block is bad */ | |
529 | switch ((this->bbt[block >> 2] >> (2 * (block & 0x03))) & 0x03) { | |
530 | case 0x01: | |
531 | case 0x03: | |
532 | continue; | |
533 | } | |
534 | page = block << (this->bbt_erase_shift - this->page_shift); | |
535 | /* Check, if the block is used by the mirror table */ | |
536 | if (!md || md->pages[chip] != page) | |
537 | goto write; | |
538 | } | |
e0c7d767 | 539 | printk(KERN_ERR "No space left to write bad block table\n"); |
1da177e4 | 540 | return -ENOSPC; |
e0c7d767 | 541 | write: |
1da177e4 LT |
542 | |
543 | /* Set up shift count and masks for the flash table */ | |
544 | bits = td->options & NAND_BBT_NRBITS_MSK; | |
545 | switch (bits) { | |
546 | case 1: sft = 3; sftmsk = 0x07; msk[0] = 0x00; msk[1] = 0x01; msk[2] = ~rcode; msk[3] = 0x01; break; | |
547 | case 2: sft = 2; sftmsk = 0x06; msk[0] = 0x00; msk[1] = 0x01; msk[2] = ~rcode; msk[3] = 0x03; break; | |
548 | case 4: sft = 1; sftmsk = 0x04; msk[0] = 0x00; msk[1] = 0x0C; msk[2] = ~rcode; msk[3] = 0x0f; break; | |
549 | case 8: sft = 0; sftmsk = 0x00; msk[0] = 0x00; msk[1] = 0x0F; msk[2] = ~rcode; msk[3] = 0xff; break; | |
550 | default: return -EINVAL; | |
551 | } | |
61b03bd7 | 552 | |
1da177e4 | 553 | bbtoffs = chip * (numblocks >> 2); |
61b03bd7 | 554 | |
1da177e4 LT |
555 | to = ((loff_t) page) << this->page_shift; |
556 | ||
e0c7d767 | 557 | memcpy(&oobinfo, this->autooob, sizeof(oobinfo)); |
1da177e4 | 558 | oobinfo.useecc = MTD_NANDECC_PLACEONLY; |
61b03bd7 | 559 | |
1da177e4 LT |
560 | /* Must we save the block contents ? */ |
561 | if (td->options & NAND_BBT_SAVECONTENT) { | |
562 | /* Make it block aligned */ | |
563 | to &= ~((loff_t) ((1 << this->bbt_erase_shift) - 1)); | |
564 | len = 1 << this->bbt_erase_shift; | |
e0c7d767 | 565 | res = mtd->read_ecc(mtd, to, len, &retlen, buf, &buf[len], &oobinfo); |
1da177e4 LT |
566 | if (res < 0) { |
567 | if (retlen != len) { | |
e0c7d767 DW |
568 | printk(KERN_INFO |
569 | "nand_bbt: Error reading block for writing the bad block table\n"); | |
1da177e4 LT |
570 | return res; |
571 | } | |
e0c7d767 | 572 | printk(KERN_WARNING "nand_bbt: ECC error while reading block for writing bad block table\n"); |
1da177e4 LT |
573 | } |
574 | /* Calc the byte offset in the buffer */ | |
575 | pageoffs = page - (int)(to >> this->page_shift); | |
576 | offs = pageoffs << this->page_shift; | |
577 | /* Preset the bbt area with 0xff */ | |
e0c7d767 | 578 | memset(&buf[offs], 0xff, (size_t) (numblocks >> sft)); |
1da177e4 | 579 | /* Preset the bbt's oob area with 0xff */ |
e0c7d767 DW |
580 | memset(&buf[len + pageoffs * mtd->oobsize], 0xff, |
581 | ((len >> this->page_shift) - pageoffs) * mtd->oobsize); | |
1da177e4 LT |
582 | if (td->options & NAND_BBT_VERSION) { |
583 | buf[len + (pageoffs * mtd->oobsize) + td->veroffs] = td->version[chip]; | |
584 | } | |
585 | } else { | |
586 | /* Calc length */ | |
587 | len = (size_t) (numblocks >> sft); | |
588 | /* Make it page aligned ! */ | |
e0c7d767 | 589 | len = (len + (mtd->oobblock - 1)) & ~(mtd->oobblock - 1); |
1da177e4 | 590 | /* Preset the buffer with 0xff */ |
e0c7d767 | 591 | memset(buf, 0xff, len + (len >> this->page_shift) * mtd->oobsize); |
1da177e4 LT |
592 | offs = 0; |
593 | /* Pattern is located in oob area of first page */ | |
e0c7d767 | 594 | memcpy(&buf[len + td->offs], td->pattern, td->len); |
1da177e4 LT |
595 | if (td->options & NAND_BBT_VERSION) { |
596 | buf[len + td->veroffs] = td->version[chip]; | |
597 | } | |
598 | } | |
61b03bd7 | 599 | |
1da177e4 | 600 | /* walk through the memory table */ |
e0c7d767 | 601 | for (i = 0; i < numblocks;) { |
1da177e4 LT |
602 | uint8_t dat; |
603 | dat = this->bbt[bbtoffs + (i >> 2)]; | |
e0c7d767 | 604 | for (j = 0; j < 4; j++, i++) { |
1da177e4 LT |
605 | int sftcnt = (i << (3 - sft)) & sftmsk; |
606 | /* Do not store the reserved bbt blocks ! */ | |
607 | buf[offs + (i >> sft)] &= ~(msk[dat & 0x03] << sftcnt); | |
608 | dat >>= 2; | |
609 | } | |
610 | } | |
61b03bd7 | 611 | |
e0c7d767 | 612 | memset(&einfo, 0, sizeof(einfo)); |
1da177e4 | 613 | einfo.mtd = mtd; |
e0c7d767 | 614 | einfo.addr = (unsigned long)to; |
1da177e4 | 615 | einfo.len = 1 << this->bbt_erase_shift; |
e0c7d767 | 616 | res = nand_erase_nand(mtd, &einfo, 1); |
1da177e4 | 617 | if (res < 0) { |
e0c7d767 | 618 | printk(KERN_WARNING "nand_bbt: Error during block erase: %d\n", res); |
1da177e4 LT |
619 | return res; |
620 | } | |
61b03bd7 | 621 | |
e0c7d767 | 622 | res = mtd->write_ecc(mtd, to, len, &retlen, buf, &buf[len], &oobinfo); |
1da177e4 | 623 | if (res < 0) { |
e0c7d767 | 624 | printk(KERN_WARNING "nand_bbt: Error while writing bad block table %d\n", res); |
1da177e4 LT |
625 | return res; |
626 | } | |
e0c7d767 DW |
627 | printk(KERN_DEBUG "Bad block table written to 0x%08x, version 0x%02X\n", |
628 | (unsigned int)to, td->version[chip]); | |
61b03bd7 | 629 | |
1da177e4 LT |
630 | /* Mark it as used */ |
631 | td->pages[chip] = page; | |
61b03bd7 | 632 | } |
1da177e4 LT |
633 | return 0; |
634 | } | |
635 | ||
636 | /** | |
637 | * nand_memory_bbt - [GENERIC] create a memory based bad block table | |
638 | * @mtd: MTD device structure | |
639 | * @bd: descriptor for the good/bad block search pattern | |
640 | * | |
61b03bd7 | 641 | * The function creates a memory based bbt by scanning the device |
1da177e4 LT |
642 | * for manufacturer / software marked good / bad blocks |
643 | */ | |
e0c7d767 | 644 | static inline int nand_memory_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd) |
1da177e4 LT |
645 | { |
646 | struct nand_chip *this = mtd->priv; | |
647 | ||
171650af | 648 | bd->options &= ~NAND_BBT_SCANEMPTY; |
e0c7d767 | 649 | return create_bbt(mtd, this->data_buf, bd, -1); |
1da177e4 LT |
650 | } |
651 | ||
652 | /** | |
e0c7d767 | 653 | * check_create - [GENERIC] create and write bbt(s) if necessary |
1da177e4 LT |
654 | * @mtd: MTD device structure |
655 | * @buf: temporary buffer | |
656 | * @bd: descriptor for the good/bad block search pattern | |
657 | * | |
658 | * The function checks the results of the previous call to read_bbt | |
e0c7d767 DW |
659 | * and creates / updates the bbt(s) if necessary |
660 | * Creation is necessary if no bbt was found for the chip/device | |
661 | * Update is necessary if one of the tables is missing or the | |
1da177e4 LT |
662 | * version nr. of one table is less than the other |
663 | */ | |
e0c7d767 | 664 | static int check_create(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *bd) |
1da177e4 LT |
665 | { |
666 | int i, chips, writeops, chipsel, res; | |
667 | struct nand_chip *this = mtd->priv; | |
668 | struct nand_bbt_descr *td = this->bbt_td; | |
669 | struct nand_bbt_descr *md = this->bbt_md; | |
670 | struct nand_bbt_descr *rd, *rd2; | |
671 | ||
672 | /* Do we have a bbt per chip ? */ | |
61b03bd7 | 673 | if (td->options & NAND_BBT_PERCHIP) |
1da177e4 | 674 | chips = this->numchips; |
61b03bd7 | 675 | else |
1da177e4 | 676 | chips = 1; |
61b03bd7 | 677 | |
1da177e4 LT |
678 | for (i = 0; i < chips; i++) { |
679 | writeops = 0; | |
680 | rd = NULL; | |
681 | rd2 = NULL; | |
682 | /* Per chip or per device ? */ | |
683 | chipsel = (td->options & NAND_BBT_PERCHIP) ? i : -1; | |
684 | /* Mirrored table avilable ? */ | |
685 | if (md) { | |
686 | if (td->pages[i] == -1 && md->pages[i] == -1) { | |
687 | writeops = 0x03; | |
688 | goto create; | |
689 | } | |
690 | ||
691 | if (td->pages[i] == -1) { | |
61b03bd7 | 692 | rd = md; |
1da177e4 LT |
693 | td->version[i] = md->version[i]; |
694 | writeops = 1; | |
695 | goto writecheck; | |
696 | } | |
697 | ||
698 | if (md->pages[i] == -1) { | |
699 | rd = td; | |
700 | md->version[i] = td->version[i]; | |
701 | writeops = 2; | |
702 | goto writecheck; | |
703 | } | |
704 | ||
705 | if (td->version[i] == md->version[i]) { | |
706 | rd = td; | |
707 | if (!(td->options & NAND_BBT_VERSION)) | |
708 | rd2 = md; | |
709 | goto writecheck; | |
61b03bd7 | 710 | } |
1da177e4 LT |
711 | |
712 | if (((int8_t) (td->version[i] - md->version[i])) > 0) { | |
713 | rd = td; | |
714 | md->version[i] = td->version[i]; | |
715 | writeops = 2; | |
716 | } else { | |
717 | rd = md; | |
718 | td->version[i] = md->version[i]; | |
719 | writeops = 1; | |
720 | } | |
721 | ||
722 | goto writecheck; | |
723 | ||
724 | } else { | |
725 | if (td->pages[i] == -1) { | |
726 | writeops = 0x01; | |
727 | goto create; | |
728 | } | |
729 | rd = td; | |
730 | goto writecheck; | |
731 | } | |
e0c7d767 | 732 | create: |
1da177e4 LT |
733 | /* Create the bad block table by scanning the device ? */ |
734 | if (!(td->options & NAND_BBT_CREATE)) | |
61b03bd7 TG |
735 | continue; |
736 | ||
1da177e4 | 737 | /* Create the table in memory by scanning the chip(s) */ |
e0c7d767 | 738 | create_bbt(mtd, buf, bd, chipsel); |
61b03bd7 | 739 | |
1da177e4 LT |
740 | td->version[i] = 1; |
741 | if (md) | |
61b03bd7 | 742 | md->version[i] = 1; |
e0c7d767 | 743 | writecheck: |
1da177e4 LT |
744 | /* read back first ? */ |
745 | if (rd) | |
e0c7d767 | 746 | read_abs_bbt(mtd, buf, rd, chipsel); |
1da177e4 LT |
747 | /* If they weren't versioned, read both. */ |
748 | if (rd2) | |
e0c7d767 | 749 | read_abs_bbt(mtd, buf, rd2, chipsel); |
1da177e4 LT |
750 | |
751 | /* Write the bad block table to the device ? */ | |
752 | if ((writeops & 0x01) && (td->options & NAND_BBT_WRITE)) { | |
e0c7d767 | 753 | res = write_bbt(mtd, buf, td, md, chipsel); |
1da177e4 LT |
754 | if (res < 0) |
755 | return res; | |
756 | } | |
61b03bd7 | 757 | |
1da177e4 LT |
758 | /* Write the mirror bad block table to the device ? */ |
759 | if ((writeops & 0x02) && md && (md->options & NAND_BBT_WRITE)) { | |
e0c7d767 | 760 | res = write_bbt(mtd, buf, md, td, chipsel); |
1da177e4 LT |
761 | if (res < 0) |
762 | return res; | |
763 | } | |
764 | } | |
61b03bd7 | 765 | return 0; |
1da177e4 LT |
766 | } |
767 | ||
768 | /** | |
61b03bd7 | 769 | * mark_bbt_regions - [GENERIC] mark the bad block table regions |
1da177e4 LT |
770 | * @mtd: MTD device structure |
771 | * @td: bad block table descriptor | |
772 | * | |
773 | * The bad block table regions are marked as "bad" to prevent | |
774 | * accidental erasures / writes. The regions are identified by | |
775 | * the mark 0x02. | |
776 | */ | |
e0c7d767 | 777 | static void mark_bbt_region(struct mtd_info *mtd, struct nand_bbt_descr *td) |
1da177e4 LT |
778 | { |
779 | struct nand_chip *this = mtd->priv; | |
780 | int i, j, chips, block, nrblocks, update; | |
781 | uint8_t oldval, newval; | |
782 | ||
783 | /* Do we have a bbt per chip ? */ | |
784 | if (td->options & NAND_BBT_PERCHIP) { | |
785 | chips = this->numchips; | |
786 | nrblocks = (int)(this->chipsize >> this->bbt_erase_shift); | |
787 | } else { | |
788 | chips = 1; | |
789 | nrblocks = (int)(mtd->size >> this->bbt_erase_shift); | |
61b03bd7 TG |
790 | } |
791 | ||
1da177e4 LT |
792 | for (i = 0; i < chips; i++) { |
793 | if ((td->options & NAND_BBT_ABSPAGE) || | |
794 | !(td->options & NAND_BBT_WRITE)) { | |
e0c7d767 DW |
795 | if (td->pages[i] == -1) |
796 | continue; | |
1da177e4 | 797 | block = td->pages[i] >> (this->bbt_erase_shift - this->page_shift); |
61b03bd7 | 798 | block <<= 1; |
1da177e4 LT |
799 | oldval = this->bbt[(block >> 3)]; |
800 | newval = oldval | (0x2 << (block & 0x06)); | |
801 | this->bbt[(block >> 3)] = newval; | |
802 | if ((oldval != newval) && td->reserved_block_code) | |
803 | nand_update_bbt(mtd, block << (this->bbt_erase_shift - 1)); | |
804 | continue; | |
805 | } | |
806 | update = 0; | |
807 | if (td->options & NAND_BBT_LASTBLOCK) | |
808 | block = ((i + 1) * nrblocks) - td->maxblocks; | |
61b03bd7 | 809 | else |
1da177e4 | 810 | block = i * nrblocks; |
61b03bd7 | 811 | block <<= 1; |
1da177e4 LT |
812 | for (j = 0; j < td->maxblocks; j++) { |
813 | oldval = this->bbt[(block >> 3)]; | |
814 | newval = oldval | (0x2 << (block & 0x06)); | |
815 | this->bbt[(block >> 3)] = newval; | |
e0c7d767 DW |
816 | if (oldval != newval) |
817 | update = 1; | |
1da177e4 | 818 | block += 2; |
61b03bd7 | 819 | } |
1da177e4 LT |
820 | /* If we want reserved blocks to be recorded to flash, and some |
821 | new ones have been marked, then we need to update the stored | |
822 | bbts. This should only happen once. */ | |
823 | if (update && td->reserved_block_code) | |
824 | nand_update_bbt(mtd, (block - 2) << (this->bbt_erase_shift - 1)); | |
825 | } | |
826 | } | |
827 | ||
828 | /** | |
829 | * nand_scan_bbt - [NAND Interface] scan, find, read and maybe create bad block table(s) | |
830 | * @mtd: MTD device structure | |
831 | * @bd: descriptor for the good/bad block search pattern | |
832 | * | |
61b03bd7 | 833 | * The function checks, if a bad block table(s) is/are already |
1da177e4 LT |
834 | * available. If not it scans the device for manufacturer |
835 | * marked good / bad blocks and writes the bad block table(s) to | |
836 | * the selected place. | |
837 | * | |
838 | * The bad block table memory is allocated here. It must be freed | |
839 | * by calling the nand_free_bbt function. | |
840 | * | |
841 | */ | |
e0c7d767 | 842 | int nand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd) |
1da177e4 LT |
843 | { |
844 | struct nand_chip *this = mtd->priv; | |
845 | int len, res = 0; | |
846 | uint8_t *buf; | |
847 | struct nand_bbt_descr *td = this->bbt_td; | |
848 | struct nand_bbt_descr *md = this->bbt_md; | |
849 | ||
850 | len = mtd->size >> (this->bbt_erase_shift + 2); | |
851 | /* Allocate memory (2bit per block) */ | |
e0c7d767 | 852 | this->bbt = kmalloc(len, GFP_KERNEL); |
1da177e4 | 853 | if (!this->bbt) { |
e0c7d767 | 854 | printk(KERN_ERR "nand_scan_bbt: Out of memory\n"); |
1da177e4 LT |
855 | return -ENOMEM; |
856 | } | |
857 | /* Clear the memory bad block table */ | |
e0c7d767 | 858 | memset(this->bbt, 0x00, len); |
1da177e4 LT |
859 | |
860 | /* If no primary table decriptor is given, scan the device | |
861 | * to build a memory based bad block table | |
862 | */ | |
eeada24d AB |
863 | if (!td) { |
864 | if ((res = nand_memory_bbt(mtd, bd))) { | |
e0c7d767 DW |
865 | printk(KERN_ERR "nand_bbt: Can't scan flash and build the RAM-based BBT\n"); |
866 | kfree(this->bbt); | |
eeada24d AB |
867 | this->bbt = NULL; |
868 | } | |
869 | return res; | |
870 | } | |
1da177e4 LT |
871 | |
872 | /* Allocate a temporary buffer for one eraseblock incl. oob */ | |
873 | len = (1 << this->bbt_erase_shift); | |
874 | len += (len >> this->page_shift) * mtd->oobsize; | |
c3f8abf4 | 875 | buf = vmalloc(len); |
1da177e4 | 876 | if (!buf) { |
e0c7d767 DW |
877 | printk(KERN_ERR "nand_bbt: Out of memory\n"); |
878 | kfree(this->bbt); | |
1da177e4 LT |
879 | this->bbt = NULL; |
880 | return -ENOMEM; | |
881 | } | |
61b03bd7 | 882 | |
1da177e4 LT |
883 | /* Is the bbt at a given page ? */ |
884 | if (td->options & NAND_BBT_ABSPAGE) { | |
e0c7d767 | 885 | res = read_abs_bbts(mtd, buf, td, md); |
61b03bd7 | 886 | } else { |
1da177e4 | 887 | /* Search the bad block table using a pattern in oob */ |
e0c7d767 | 888 | res = search_read_bbts(mtd, buf, td, md); |
61b03bd7 | 889 | } |
1da177e4 | 890 | |
61b03bd7 | 891 | if (res) |
e0c7d767 | 892 | res = check_create(mtd, buf, bd); |
61b03bd7 | 893 | |
1da177e4 | 894 | /* Prevent the bbt regions from erasing / writing */ |
e0c7d767 | 895 | mark_bbt_region(mtd, td); |
1da177e4 | 896 | if (md) |
e0c7d767 | 897 | mark_bbt_region(mtd, md); |
61b03bd7 | 898 | |
e0c7d767 | 899 | vfree(buf); |
1da177e4 LT |
900 | return res; |
901 | } | |
902 | ||
1da177e4 | 903 | /** |
61b03bd7 | 904 | * nand_update_bbt - [NAND Interface] update bad block table(s) |
1da177e4 LT |
905 | * @mtd: MTD device structure |
906 | * @offs: the offset of the newly marked block | |
907 | * | |
908 | * The function updates the bad block table(s) | |
909 | */ | |
e0c7d767 | 910 | int nand_update_bbt(struct mtd_info *mtd, loff_t offs) |
1da177e4 LT |
911 | { |
912 | struct nand_chip *this = mtd->priv; | |
913 | int len, res = 0, writeops = 0; | |
914 | int chip, chipsel; | |
915 | uint8_t *buf; | |
916 | struct nand_bbt_descr *td = this->bbt_td; | |
917 | struct nand_bbt_descr *md = this->bbt_md; | |
918 | ||
919 | if (!this->bbt || !td) | |
920 | return -EINVAL; | |
921 | ||
922 | len = mtd->size >> (this->bbt_erase_shift + 2); | |
923 | /* Allocate a temporary buffer for one eraseblock incl. oob */ | |
924 | len = (1 << this->bbt_erase_shift); | |
925 | len += (len >> this->page_shift) * mtd->oobsize; | |
e0c7d767 | 926 | buf = kmalloc(len, GFP_KERNEL); |
1da177e4 | 927 | if (!buf) { |
e0c7d767 | 928 | printk(KERN_ERR "nand_update_bbt: Out of memory\n"); |
1da177e4 LT |
929 | return -ENOMEM; |
930 | } | |
61b03bd7 | 931 | |
1da177e4 LT |
932 | writeops = md != NULL ? 0x03 : 0x01; |
933 | ||
934 | /* Do we have a bbt per chip ? */ | |
935 | if (td->options & NAND_BBT_PERCHIP) { | |
e0c7d767 | 936 | chip = (int)(offs >> this->chip_shift); |
1da177e4 LT |
937 | chipsel = chip; |
938 | } else { | |
939 | chip = 0; | |
940 | chipsel = -1; | |
941 | } | |
942 | ||
943 | td->version[chip]++; | |
944 | if (md) | |
61b03bd7 | 945 | md->version[chip]++; |
1da177e4 LT |
946 | |
947 | /* Write the bad block table to the device ? */ | |
948 | if ((writeops & 0x01) && (td->options & NAND_BBT_WRITE)) { | |
e0c7d767 | 949 | res = write_bbt(mtd, buf, td, md, chipsel); |
1da177e4 LT |
950 | if (res < 0) |
951 | goto out; | |
952 | } | |
953 | /* Write the mirror bad block table to the device ? */ | |
954 | if ((writeops & 0x02) && md && (md->options & NAND_BBT_WRITE)) { | |
e0c7d767 | 955 | res = write_bbt(mtd, buf, md, td, chipsel); |
1da177e4 LT |
956 | } |
957 | ||
e0c7d767 DW |
958 | out: |
959 | kfree(buf); | |
1da177e4 LT |
960 | return res; |
961 | } | |
962 | ||
61b03bd7 | 963 | /* Define some generic bad / good block scan pattern which are used |
171650af | 964 | * while scanning a device for factory marked good / bad blocks. */ |
1da177e4 LT |
965 | static uint8_t scan_ff_pattern[] = { 0xff, 0xff }; |
966 | ||
967 | static struct nand_bbt_descr smallpage_memorybased = { | |
171650af | 968 | .options = NAND_BBT_SCAN2NDPAGE, |
1da177e4 LT |
969 | .offs = 5, |
970 | .len = 1, | |
971 | .pattern = scan_ff_pattern | |
972 | }; | |
973 | ||
974 | static struct nand_bbt_descr largepage_memorybased = { | |
975 | .options = 0, | |
976 | .offs = 0, | |
977 | .len = 2, | |
978 | .pattern = scan_ff_pattern | |
979 | }; | |
980 | ||
981 | static struct nand_bbt_descr smallpage_flashbased = { | |
6943f8af | 982 | .options = NAND_BBT_SCAN2NDPAGE, |
1da177e4 LT |
983 | .offs = 5, |
984 | .len = 1, | |
985 | .pattern = scan_ff_pattern | |
986 | }; | |
987 | ||
988 | static struct nand_bbt_descr largepage_flashbased = { | |
6943f8af | 989 | .options = NAND_BBT_SCAN2NDPAGE, |
1da177e4 LT |
990 | .offs = 0, |
991 | .len = 2, | |
992 | .pattern = scan_ff_pattern | |
993 | }; | |
994 | ||
995 | static uint8_t scan_agand_pattern[] = { 0x1C, 0x71, 0xC7, 0x1C, 0x71, 0xC7 }; | |
996 | ||
997 | static struct nand_bbt_descr agand_flashbased = { | |
998 | .options = NAND_BBT_SCANEMPTY | NAND_BBT_SCANALLPAGES, | |
999 | .offs = 0x20, | |
1000 | .len = 6, | |
1001 | .pattern = scan_agand_pattern | |
1002 | }; | |
1003 | ||
1004 | /* Generic flash bbt decriptors | |
1005 | */ | |
1006 | static uint8_t bbt_pattern[] = {'B', 'b', 't', '0' }; | |
1007 | static uint8_t mirror_pattern[] = {'1', 't', 'b', 'B' }; | |
1008 | ||
1009 | static struct nand_bbt_descr bbt_main_descr = { | |
61b03bd7 | 1010 | .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
1da177e4 LT |
1011 | | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP, |
1012 | .offs = 8, | |
1013 | .len = 4, | |
1014 | .veroffs = 12, | |
1015 | .maxblocks = 4, | |
1016 | .pattern = bbt_pattern | |
1017 | }; | |
1018 | ||
1019 | static struct nand_bbt_descr bbt_mirror_descr = { | |
61b03bd7 | 1020 | .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
1da177e4 LT |
1021 | | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP, |
1022 | .offs = 8, | |
1023 | .len = 4, | |
1024 | .veroffs = 12, | |
1025 | .maxblocks = 4, | |
1026 | .pattern = mirror_pattern | |
1027 | }; | |
1028 | ||
1029 | /** | |
61b03bd7 | 1030 | * nand_default_bbt - [NAND Interface] Select a default bad block table for the device |
1da177e4 LT |
1031 | * @mtd: MTD device structure |
1032 | * | |
1033 | * This function selects the default bad block table | |
1034 | * support for the device and calls the nand_scan_bbt function | |
1035 | * | |
1036 | */ | |
e0c7d767 | 1037 | int nand_default_bbt(struct mtd_info *mtd) |
1da177e4 LT |
1038 | { |
1039 | struct nand_chip *this = mtd->priv; | |
61b03bd7 TG |
1040 | |
1041 | /* Default for AG-AND. We must use a flash based | |
1da177e4 LT |
1042 | * bad block table as the devices have factory marked |
1043 | * _good_ blocks. Erasing those blocks leads to loss | |
1044 | * of the good / bad information, so we _must_ store | |
61b03bd7 | 1045 | * this information in a good / bad table during |
1da177e4 | 1046 | * startup |
e0c7d767 | 1047 | */ |
1da177e4 LT |
1048 | if (this->options & NAND_IS_AND) { |
1049 | /* Use the default pattern descriptors */ | |
61b03bd7 | 1050 | if (!this->bbt_td) { |
1da177e4 LT |
1051 | this->bbt_td = &bbt_main_descr; |
1052 | this->bbt_md = &bbt_mirror_descr; | |
61b03bd7 | 1053 | } |
1da177e4 | 1054 | this->options |= NAND_USE_FLASH_BBT; |
e0c7d767 | 1055 | return nand_scan_bbt(mtd, &agand_flashbased); |
1da177e4 | 1056 | } |
61b03bd7 | 1057 | |
1da177e4 LT |
1058 | /* Is a flash based bad block table requested ? */ |
1059 | if (this->options & NAND_USE_FLASH_BBT) { | |
61b03bd7 TG |
1060 | /* Use the default pattern descriptors */ |
1061 | if (!this->bbt_td) { | |
1da177e4 LT |
1062 | this->bbt_td = &bbt_main_descr; |
1063 | this->bbt_md = &bbt_mirror_descr; | |
1064 | } | |
1065 | if (!this->badblock_pattern) { | |
e0c7d767 | 1066 | this->badblock_pattern = (mtd->oobblock > 512) ? &largepage_flashbased : &smallpage_flashbased; |
1da177e4 LT |
1067 | } |
1068 | } else { | |
1069 | this->bbt_td = NULL; | |
1070 | this->bbt_md = NULL; | |
1071 | if (!this->badblock_pattern) { | |
1072 | this->badblock_pattern = (mtd->oobblock > 512) ? | |
e0c7d767 | 1073 | &largepage_memorybased : &smallpage_memorybased; |
1da177e4 LT |
1074 | } |
1075 | } | |
e0c7d767 | 1076 | return nand_scan_bbt(mtd, this->badblock_pattern); |
1da177e4 LT |
1077 | } |
1078 | ||
1079 | /** | |
61b03bd7 | 1080 | * nand_isbad_bbt - [NAND Interface] Check if a block is bad |
1da177e4 LT |
1081 | * @mtd: MTD device structure |
1082 | * @offs: offset in the device | |
1083 | * @allowbbt: allow access to bad block table region | |
1084 | * | |
1085 | */ | |
e0c7d767 | 1086 | int nand_isbad_bbt(struct mtd_info *mtd, loff_t offs, int allowbbt) |
1da177e4 LT |
1087 | { |
1088 | struct nand_chip *this = mtd->priv; | |
1089 | int block; | |
e0c7d767 | 1090 | uint8_t res; |
61b03bd7 | 1091 | |
1da177e4 | 1092 | /* Get block number * 2 */ |
e0c7d767 | 1093 | block = (int)(offs >> (this->bbt_erase_shift - 1)); |
1da177e4 LT |
1094 | res = (this->bbt[block >> 3] >> (block & 0x06)) & 0x03; |
1095 | ||
e0c7d767 DW |
1096 | DEBUG(MTD_DEBUG_LEVEL2, "nand_isbad_bbt(): bbt info for offs 0x%08x: (block %d) 0x%02x\n", |
1097 | (unsigned int)offs, block >> 1, res); | |
1da177e4 LT |
1098 | |
1099 | switch ((int)res) { | |
e0c7d767 DW |
1100 | case 0x00: |
1101 | return 0; | |
1102 | case 0x01: | |
1103 | return 1; | |
1104 | case 0x02: | |
1105 | return allowbbt ? 0 : 1; | |
1da177e4 LT |
1106 | } |
1107 | return 1; | |
1108 | } | |
1109 | ||
e0c7d767 DW |
1110 | EXPORT_SYMBOL(nand_scan_bbt); |
1111 | EXPORT_SYMBOL(nand_default_bbt); |