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 | * |
d159c4e5 | 7 | * Copyright © 2004 Thomas Gleixner (tglx@linutronix.de) |
1da177e4 | 8 | * |
1da177e4 LT |
9 | * This program is free software; you can redistribute it and/or modify |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | * | |
13 | * Description: | |
14 | * | |
61b03bd7 | 15 | * When nand_scan_bbt is called, then it tries to find the bad block table |
7cba7b14 | 16 | * depending on the options in the BBT descriptor(s). If no flash based BBT |
bb9ebd4e | 17 | * (NAND_BBT_USE_FLASH) is specified then the device is scanned for factory |
7cba7b14 SAS |
18 | * marked good / bad blocks. This information is used to create a memory BBT. |
19 | * Once a new bad block is discovered then the "factory" information is updated | |
20 | * on the device. | |
21 | * If a flash based BBT is specified then the function first tries to find the | |
22 | * BBT on flash. If a BBT is found then the contents are read and the memory | |
23 | * based BBT is created. If a mirrored BBT is selected then the mirror is | |
24 | * searched too and the versions are compared. If the mirror has a greater | |
44ed0ffd | 25 | * version number, then the mirror BBT is used to build the memory based BBT. |
1da177e4 | 26 | * If the tables are not versioned, then we "or" the bad block information. |
7cba7b14 SAS |
27 | * If one of the BBTs is out of date or does not exist it is (re)created. |
28 | * If no BBT exists at all then the device is scanned for factory marked | |
61b03bd7 | 29 | * good / bad blocks and the bad block tables are created. |
1da177e4 | 30 | * |
7cba7b14 SAS |
31 | * For manufacturer created BBTs like the one found on M-SYS DOC devices |
32 | * the BBT is searched and read but never created | |
1da177e4 | 33 | * |
7cba7b14 | 34 | * The auto generated bad block table is located in the last good blocks |
61b03bd7 | 35 | * of the device. The table is mirrored, so it can be updated eventually. |
7cba7b14 SAS |
36 | * The table is marked in the OOB area with an ident pattern and a version |
37 | * number which indicates which of both tables is more up to date. If the NAND | |
38 | * controller needs the complete OOB area for the ECC information then the | |
bb9ebd4e | 39 | * option NAND_BBT_NO_OOB should be used (along with NAND_BBT_USE_FLASH, of |
a40f7341 BN |
40 | * course): it moves the ident pattern and the version byte into the data area |
41 | * and the OOB area will remain untouched. | |
1da177e4 LT |
42 | * |
43 | * The table uses 2 bits per block | |
7cba7b14 SAS |
44 | * 11b: block is good |
45 | * 00b: block is factory marked bad | |
46 | * 01b, 10b: block is marked bad due to wear | |
1da177e4 LT |
47 | * |
48 | * The memory bad block table uses the following scheme: | |
49 | * 00b: block is good | |
50 | * 01b: block is marked bad due to wear | |
51 | * 10b: block is reserved (to protect the bbt area) | |
52 | * 11b: block is factory marked bad | |
61b03bd7 | 53 | * |
1da177e4 LT |
54 | * Multichip devices like DOC store the bad block info per floor. |
55 | * | |
56 | * Following assumptions are made: | |
57 | * - bbts start at a page boundary, if autolocated on a block boundary | |
e0c7d767 | 58 | * - the space necessary for a bbt in FLASH does not exceed a block boundary |
61b03bd7 | 59 | * |
1da177e4 LT |
60 | */ |
61 | ||
62 | #include <linux/slab.h> | |
63 | #include <linux/types.h> | |
64 | #include <linux/mtd/mtd.h> | |
61de9da6 | 65 | #include <linux/mtd/bbm.h> |
1da177e4 LT |
66 | #include <linux/mtd/nand.h> |
67 | #include <linux/mtd/nand_ecc.h> | |
1da177e4 LT |
68 | #include <linux/bitops.h> |
69 | #include <linux/delay.h> | |
c3f8abf4 | 70 | #include <linux/vmalloc.h> |
f3bcc017 | 71 | #include <linux/export.h> |
491ed06f | 72 | #include <linux/string.h> |
1da177e4 | 73 | |
771c568b BN |
74 | #define BBT_BLOCK_GOOD 0x00 |
75 | #define BBT_BLOCK_WORN 0x01 | |
76 | #define BBT_BLOCK_RESERVED 0x02 | |
77 | #define BBT_BLOCK_FACTORY_BAD 0x03 | |
78 | ||
79 | #define BBT_ENTRY_MASK 0x03 | |
80 | #define BBT_ENTRY_SHIFT 2 | |
81 | ||
b32843b7 BN |
82 | static int nand_update_bbt(struct mtd_info *mtd, loff_t offs); |
83 | ||
771c568b BN |
84 | static inline uint8_t bbt_get_entry(struct nand_chip *chip, int block) |
85 | { | |
86 | uint8_t entry = chip->bbt[block >> BBT_ENTRY_SHIFT]; | |
87 | entry >>= (block & BBT_ENTRY_MASK) * 2; | |
88 | return entry & BBT_ENTRY_MASK; | |
89 | } | |
90 | ||
91 | static inline void bbt_mark_entry(struct nand_chip *chip, int block, | |
92 | uint8_t mark) | |
93 | { | |
94 | uint8_t msk = (mark & BBT_ENTRY_MASK) << ((block & BBT_ENTRY_MASK) * 2); | |
95 | chip->bbt[block >> BBT_ENTRY_SHIFT] |= msk; | |
96 | } | |
97 | ||
7cba7b14 SAS |
98 | static int check_pattern_no_oob(uint8_t *buf, struct nand_bbt_descr *td) |
99 | { | |
718894ad BN |
100 | if (memcmp(buf, td->pattern, td->len)) |
101 | return -1; | |
102 | return 0; | |
7cba7b14 SAS |
103 | } |
104 | ||
61b03bd7 | 105 | /** |
1da177e4 | 106 | * check_pattern - [GENERIC] check if a pattern is in the buffer |
8b6e50c9 BN |
107 | * @buf: the buffer to search |
108 | * @len: the length of buffer to search | |
109 | * @paglen: the pagelength | |
110 | * @td: search pattern descriptor | |
1da177e4 | 111 | * |
8b6e50c9 | 112 | * Check for a pattern at the given place. Used to search bad block tables and |
dad22562 | 113 | * good / bad block identifiers. |
8b6e50c9 | 114 | */ |
e0c7d767 | 115 | static int check_pattern(uint8_t *buf, int len, int paglen, struct nand_bbt_descr *td) |
1da177e4 | 116 | { |
7cba7b14 SAS |
117 | if (td->options & NAND_BBT_NO_OOB) |
118 | return check_pattern_no_oob(buf, td); | |
119 | ||
1da177e4 | 120 | /* Compare the pattern */ |
dad22562 | 121 | if (memcmp(buf + paglen + td->offs, td->pattern, td->len)) |
75b66d8c | 122 | return -1; |
58373ff0 | 123 | |
1da177e4 LT |
124 | return 0; |
125 | } | |
126 | ||
61b03bd7 | 127 | /** |
c9e05365 | 128 | * check_short_pattern - [GENERIC] check if a pattern is in the buffer |
8b6e50c9 BN |
129 | * @buf: the buffer to search |
130 | * @td: search pattern descriptor | |
c9e05365 | 131 | * |
8b6e50c9 BN |
132 | * Check for a pattern at the given place. Used to search bad block tables and |
133 | * good / bad block identifiers. Same as check_pattern, but no optional empty | |
134 | * check. | |
135 | */ | |
e0c7d767 | 136 | static int check_short_pattern(uint8_t *buf, struct nand_bbt_descr *td) |
c9e05365 | 137 | { |
c9e05365 | 138 | /* Compare the pattern */ |
491ed06f BN |
139 | if (memcmp(buf + td->offs, td->pattern, td->len)) |
140 | return -1; | |
c9e05365 TG |
141 | return 0; |
142 | } | |
143 | ||
7cba7b14 SAS |
144 | /** |
145 | * add_marker_len - compute the length of the marker in data area | |
8b6e50c9 | 146 | * @td: BBT descriptor used for computation |
7cba7b14 | 147 | * |
7854d3f7 | 148 | * The length will be 0 if the marker is located in OOB area. |
7cba7b14 SAS |
149 | */ |
150 | static u32 add_marker_len(struct nand_bbt_descr *td) | |
151 | { | |
152 | u32 len; | |
153 | ||
154 | if (!(td->options & NAND_BBT_NO_OOB)) | |
155 | return 0; | |
156 | ||
157 | len = td->len; | |
158 | if (td->options & NAND_BBT_VERSION) | |
159 | len++; | |
160 | return len; | |
161 | } | |
162 | ||
1da177e4 LT |
163 | /** |
164 | * read_bbt - [GENERIC] Read the bad block table starting from page | |
8b6e50c9 BN |
165 | * @mtd: MTD device structure |
166 | * @buf: temporary buffer | |
167 | * @page: the starting page | |
168 | * @num: the number of bbt descriptors to read | |
7854d3f7 | 169 | * @td: the bbt describtion table |
b4d20d60 | 170 | * @offs: block number offset in the table |
1da177e4 LT |
171 | * |
172 | * Read the bad block table starting from page. | |
1da177e4 | 173 | */ |
e0c7d767 | 174 | static int read_bbt(struct mtd_info *mtd, uint8_t *buf, int page, int num, |
df5b4e34 | 175 | struct nand_bbt_descr *td, int offs) |
1da177e4 | 176 | { |
167a8d52 | 177 | int res, ret = 0, i, j, act = 0; |
1da177e4 LT |
178 | struct nand_chip *this = mtd->priv; |
179 | size_t retlen, len, totlen; | |
180 | loff_t from; | |
df5b4e34 | 181 | int bits = td->options & NAND_BBT_NRBITS_MSK; |
596d7452 | 182 | uint8_t msk = (uint8_t)((1 << bits) - 1); |
7cba7b14 | 183 | u32 marker_len; |
df5b4e34 | 184 | int reserved_block_code = td->reserved_block_code; |
1da177e4 LT |
185 | |
186 | totlen = (num * bits) >> 3; | |
7cba7b14 | 187 | marker_len = add_marker_len(td); |
596d7452 | 188 | from = ((loff_t)page) << this->page_shift; |
61b03bd7 | 189 | |
1da177e4 | 190 | while (totlen) { |
596d7452 | 191 | len = min(totlen, (size_t)(1 << this->bbt_erase_shift)); |
7cba7b14 SAS |
192 | if (marker_len) { |
193 | /* | |
194 | * In case the BBT marker is not in the OOB area it | |
195 | * will be just in the first page. | |
196 | */ | |
197 | len -= marker_len; | |
198 | from += marker_len; | |
199 | marker_len = 0; | |
200 | } | |
329ad399 | 201 | res = mtd_read(mtd, from, len, &retlen, buf); |
1da177e4 | 202 | if (res < 0) { |
167a8d52 | 203 | if (mtd_is_eccerr(res)) { |
2ac63d90 RM |
204 | pr_info("nand_bbt: ECC error in BBT at 0x%012llx\n", |
205 | from & ~mtd->writesize); | |
167a8d52 BN |
206 | return res; |
207 | } else if (mtd_is_bitflip(res)) { | |
2ac63d90 RM |
208 | pr_info("nand_bbt: corrected error in BBT at 0x%012llx\n", |
209 | from & ~mtd->writesize); | |
167a8d52 BN |
210 | ret = res; |
211 | } else { | |
212 | pr_info("nand_bbt: error reading BBT\n"); | |
1da177e4 LT |
213 | return res; |
214 | } | |
61b03bd7 | 215 | } |
1da177e4 LT |
216 | |
217 | /* Analyse data */ | |
218 | for (i = 0; i < len; i++) { | |
219 | uint8_t dat = buf[i]; | |
b4d20d60 | 220 | for (j = 0; j < 8; j += bits, act++) { |
1da177e4 LT |
221 | uint8_t tmp = (dat >> j) & msk; |
222 | if (tmp == msk) | |
223 | continue; | |
e0c7d767 | 224 | if (reserved_block_code && (tmp == reserved_block_code)) { |
d0370219 | 225 | pr_info("nand_read_bbt: reserved block at 0x%012llx\n", |
b4d20d60 BN |
226 | (loff_t)(offs + act) << |
227 | this->bbt_erase_shift); | |
228 | bbt_mark_entry(this, offs + act, | |
771c568b | 229 | BBT_BLOCK_RESERVED); |
f1a28c02 | 230 | mtd->ecc_stats.bbtblocks++; |
1da177e4 LT |
231 | continue; |
232 | } | |
8b6e50c9 BN |
233 | /* |
234 | * Leave it for now, if it's matured we can | |
a0f5080e | 235 | * move this message to pr_debug. |
8b6e50c9 | 236 | */ |
d0370219 | 237 | pr_info("nand_read_bbt: bad block at 0x%012llx\n", |
b4d20d60 BN |
238 | (loff_t)(offs + act) << |
239 | this->bbt_erase_shift); | |
8b6e50c9 | 240 | /* Factory marked bad or worn out? */ |
1da177e4 | 241 | if (tmp == 0) |
b4d20d60 | 242 | bbt_mark_entry(this, offs + act, |
771c568b | 243 | BBT_BLOCK_FACTORY_BAD); |
1da177e4 | 244 | else |
b4d20d60 | 245 | bbt_mark_entry(this, offs + act, |
771c568b | 246 | BBT_BLOCK_WORN); |
f1a28c02 | 247 | mtd->ecc_stats.badblocks++; |
61b03bd7 | 248 | } |
1da177e4 LT |
249 | } |
250 | totlen -= len; | |
251 | from += len; | |
252 | } | |
167a8d52 | 253 | return ret; |
1da177e4 LT |
254 | } |
255 | ||
256 | /** | |
257 | * read_abs_bbt - [GENERIC] Read the bad block table starting at a given page | |
8b6e50c9 BN |
258 | * @mtd: MTD device structure |
259 | * @buf: temporary buffer | |
260 | * @td: descriptor for the bad block table | |
596d7452 | 261 | * @chip: read the table for a specific chip, -1 read all chips; applies only if |
8b6e50c9 | 262 | * NAND_BBT_PERCHIP option is set |
1da177e4 | 263 | * |
8b6e50c9 BN |
264 | * Read the bad block table for all chips starting at a given page. We assume |
265 | * that the bbt bits are in consecutive order. | |
266 | */ | |
e0c7d767 | 267 | static int read_abs_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td, int chip) |
1da177e4 LT |
268 | { |
269 | struct nand_chip *this = mtd->priv; | |
270 | int res = 0, i; | |
1da177e4 | 271 | |
1da177e4 LT |
272 | if (td->options & NAND_BBT_PERCHIP) { |
273 | int offs = 0; | |
274 | for (i = 0; i < this->numchips; i++) { | |
275 | if (chip == -1 || chip == i) | |
df5b4e34 SAS |
276 | res = read_bbt(mtd, buf, td->pages[i], |
277 | this->chipsize >> this->bbt_erase_shift, | |
278 | td, offs); | |
1da177e4 LT |
279 | if (res) |
280 | return res; | |
b4d20d60 | 281 | offs += this->chipsize >> this->bbt_erase_shift; |
1da177e4 LT |
282 | } |
283 | } else { | |
df5b4e34 SAS |
284 | res = read_bbt(mtd, buf, td->pages[0], |
285 | mtd->size >> this->bbt_erase_shift, td, 0); | |
1da177e4 LT |
286 | if (res) |
287 | return res; | |
288 | } | |
289 | return 0; | |
290 | } | |
291 | ||
8b6e50c9 | 292 | /* BBT marker is in the first page, no OOB */ |
af69dcd3 | 293 | static int scan_read_data(struct mtd_info *mtd, uint8_t *buf, loff_t offs, |
7cba7b14 SAS |
294 | struct nand_bbt_descr *td) |
295 | { | |
296 | size_t retlen; | |
297 | size_t len; | |
298 | ||
299 | len = td->len; | |
300 | if (td->options & NAND_BBT_VERSION) | |
301 | len++; | |
302 | ||
329ad399 | 303 | return mtd_read(mtd, offs, len, &retlen, buf); |
7cba7b14 SAS |
304 | } |
305 | ||
a7e68834 | 306 | /** |
af69dcd3 | 307 | * scan_read_oob - [GENERIC] Scan data+OOB region to buffer |
a7e68834 BN |
308 | * @mtd: MTD device structure |
309 | * @buf: temporary buffer | |
310 | * @offs: offset at which to scan | |
311 | * @len: length of data region to read | |
312 | * | |
313 | * Scan read data from data+OOB. May traverse multiple pages, interleaving | |
314 | * page,OOB,page,OOB,... in buf. Completes transfer and returns the "strongest" | |
315 | * ECC condition (error or bitflip). May quit on the first (non-ECC) error. | |
316 | */ | |
af69dcd3 | 317 | static int scan_read_oob(struct mtd_info *mtd, uint8_t *buf, loff_t offs, |
8593fbc6 TG |
318 | size_t len) |
319 | { | |
320 | struct mtd_oob_ops ops; | |
a7e68834 | 321 | int res, ret = 0; |
8593fbc6 | 322 | |
a7e68834 | 323 | ops.mode = MTD_OPS_PLACE_OOB; |
8593fbc6 TG |
324 | ops.ooboffs = 0; |
325 | ops.ooblen = mtd->oobsize; | |
8593fbc6 | 326 | |
b64d39d8 | 327 | while (len > 0) { |
105513cc BN |
328 | ops.datbuf = buf; |
329 | ops.len = min(len, (size_t)mtd->writesize); | |
330 | ops.oobbuf = buf + ops.len; | |
b64d39d8 | 331 | |
fd2819bb | 332 | res = mtd_read_oob(mtd, offs, &ops); |
a7e68834 BN |
333 | if (res) { |
334 | if (!mtd_is_bitflip_or_eccerr(res)) | |
335 | return res; | |
336 | else if (mtd_is_eccerr(res) || !ret) | |
337 | ret = res; | |
338 | } | |
b64d39d8 ML |
339 | |
340 | buf += mtd->oobsize + mtd->writesize; | |
341 | len -= mtd->writesize; | |
34a5704d | 342 | offs += mtd->writesize; |
b64d39d8 | 343 | } |
a7e68834 | 344 | return ret; |
8593fbc6 TG |
345 | } |
346 | ||
af69dcd3 | 347 | static int scan_read(struct mtd_info *mtd, uint8_t *buf, loff_t offs, |
7cba7b14 SAS |
348 | size_t len, struct nand_bbt_descr *td) |
349 | { | |
350 | if (td->options & NAND_BBT_NO_OOB) | |
af69dcd3 | 351 | return scan_read_data(mtd, buf, offs, td); |
7cba7b14 | 352 | else |
af69dcd3 | 353 | return scan_read_oob(mtd, buf, offs, len); |
7cba7b14 SAS |
354 | } |
355 | ||
8b6e50c9 | 356 | /* Scan write data with oob to flash */ |
8593fbc6 TG |
357 | static int scan_write_bbt(struct mtd_info *mtd, loff_t offs, size_t len, |
358 | uint8_t *buf, uint8_t *oob) | |
359 | { | |
360 | struct mtd_oob_ops ops; | |
361 | ||
0612b9dd | 362 | ops.mode = MTD_OPS_PLACE_OOB; |
8593fbc6 TG |
363 | ops.ooboffs = 0; |
364 | ops.ooblen = mtd->oobsize; | |
365 | ops.datbuf = buf; | |
366 | ops.oobbuf = oob; | |
367 | ops.len = len; | |
368 | ||
a2cc5ba0 | 369 | return mtd_write_oob(mtd, offs, &ops); |
8593fbc6 TG |
370 | } |
371 | ||
7cba7b14 SAS |
372 | static u32 bbt_get_ver_offs(struct mtd_info *mtd, struct nand_bbt_descr *td) |
373 | { | |
374 | u32 ver_offs = td->veroffs; | |
375 | ||
376 | if (!(td->options & NAND_BBT_NO_OOB)) | |
377 | ver_offs += mtd->writesize; | |
378 | return ver_offs; | |
379 | } | |
380 | ||
1da177e4 LT |
381 | /** |
382 | * read_abs_bbts - [GENERIC] Read the bad block table(s) for all chips starting at a given page | |
8b6e50c9 BN |
383 | * @mtd: MTD device structure |
384 | * @buf: temporary buffer | |
385 | * @td: descriptor for the bad block table | |
386 | * @md: descriptor for the bad block table mirror | |
1da177e4 | 387 | * |
8b6e50c9 BN |
388 | * Read the bad block table(s) for all chips starting at a given page. We |
389 | * assume that the bbt bits are in consecutive order. | |
390 | */ | |
7b5a2d40 BN |
391 | static void read_abs_bbts(struct mtd_info *mtd, uint8_t *buf, |
392 | struct nand_bbt_descr *td, struct nand_bbt_descr *md) | |
1da177e4 LT |
393 | { |
394 | struct nand_chip *this = mtd->priv; | |
395 | ||
61b03bd7 | 396 | /* Read the primary version, if available */ |
1da177e4 | 397 | if (td->options & NAND_BBT_VERSION) { |
af69dcd3 | 398 | scan_read(mtd, buf, (loff_t)td->pages[0] << this->page_shift, |
7cba7b14 SAS |
399 | mtd->writesize, td); |
400 | td->version[0] = buf[bbt_get_ver_offs(mtd, td)]; | |
9a4d4d69 | 401 | pr_info("Bad block table at page %d, version 0x%02X\n", |
d0370219 | 402 | td->pages[0], td->version[0]); |
1da177e4 LT |
403 | } |
404 | ||
61b03bd7 | 405 | /* Read the mirror version, if available */ |
1da177e4 | 406 | if (md && (md->options & NAND_BBT_VERSION)) { |
af69dcd3 | 407 | scan_read(mtd, buf, (loff_t)md->pages[0] << this->page_shift, |
7bb9c754 | 408 | mtd->writesize, md); |
7cba7b14 | 409 | md->version[0] = buf[bbt_get_ver_offs(mtd, md)]; |
9a4d4d69 | 410 | pr_info("Bad block table at page %d, version 0x%02X\n", |
d0370219 | 411 | md->pages[0], md->version[0]); |
1da177e4 | 412 | } |
1da177e4 LT |
413 | } |
414 | ||
8b6e50c9 | 415 | /* Scan a given block partially */ |
8593fbc6 | 416 | static int scan_block_fast(struct mtd_info *mtd, struct nand_bbt_descr *bd, |
eceb84b1 | 417 | loff_t offs, uint8_t *buf, int numpages) |
8593fbc6 TG |
418 | { |
419 | struct mtd_oob_ops ops; | |
420 | int j, ret; | |
421 | ||
8593fbc6 TG |
422 | ops.ooblen = mtd->oobsize; |
423 | ops.oobbuf = buf; | |
424 | ops.ooboffs = 0; | |
425 | ops.datbuf = NULL; | |
0612b9dd | 426 | ops.mode = MTD_OPS_PLACE_OOB; |
8593fbc6 | 427 | |
eceb84b1 | 428 | for (j = 0; j < numpages; j++) { |
8593fbc6 | 429 | /* |
8b6e50c9 BN |
430 | * Read the full oob until read_oob is fixed to handle single |
431 | * byte reads for 16 bit buswidth. | |
8593fbc6 | 432 | */ |
fd2819bb | 433 | ret = mtd_read_oob(mtd, offs, &ops); |
903cd06c | 434 | /* Ignore ECC errors when checking for BBM */ |
d57f4054 | 435 | if (ret && !mtd_is_bitflip_or_eccerr(ret)) |
8593fbc6 TG |
436 | return ret; |
437 | ||
438 | if (check_short_pattern(buf, bd)) | |
439 | return 1; | |
440 | ||
441 | offs += mtd->writesize; | |
442 | } | |
443 | return 0; | |
444 | } | |
445 | ||
1da177e4 LT |
446 | /** |
447 | * create_bbt - [GENERIC] Create a bad block table by scanning the device | |
8b6e50c9 BN |
448 | * @mtd: MTD device structure |
449 | * @buf: temporary buffer | |
450 | * @bd: descriptor for the good/bad block search pattern | |
451 | * @chip: create the table for a specific chip, -1 read all chips; applies only | |
452 | * if NAND_BBT_PERCHIP option is set | |
1da177e4 | 453 | * |
8b6e50c9 BN |
454 | * Create a bad block table by scanning the device for the given good/bad block |
455 | * identify pattern. | |
1da177e4 | 456 | */ |
8593fbc6 TG |
457 | static int create_bbt(struct mtd_info *mtd, uint8_t *buf, |
458 | struct nand_bbt_descr *bd, int chip) | |
1da177e4 LT |
459 | { |
460 | struct nand_chip *this = mtd->priv; | |
5961ad2c | 461 | int i, numblocks, numpages; |
1da177e4 LT |
462 | int startblock; |
463 | loff_t from; | |
1da177e4 | 464 | |
9a4d4d69 | 465 | pr_info("Scanning device for bad blocks\n"); |
1da177e4 | 466 | |
5961ad2c | 467 | if (bd->options & NAND_BBT_SCAN2NDPAGE) |
eceb84b1 | 468 | numpages = 2; |
58373ff0 | 469 | else |
eceb84b1 | 470 | numpages = 1; |
171650af | 471 | |
1da177e4 | 472 | if (chip == -1) { |
b4d20d60 | 473 | numblocks = mtd->size >> this->bbt_erase_shift; |
1da177e4 LT |
474 | startblock = 0; |
475 | from = 0; | |
476 | } else { | |
477 | if (chip >= this->numchips) { | |
9a4d4d69 | 478 | pr_warn("create_bbt(): chipnr (%d) > available chips (%d)\n", |
e0c7d767 | 479 | chip + 1, this->numchips); |
171650af | 480 | return -EINVAL; |
1da177e4 | 481 | } |
b4d20d60 | 482 | numblocks = this->chipsize >> this->bbt_erase_shift; |
1da177e4 LT |
483 | startblock = chip * numblocks; |
484 | numblocks += startblock; | |
b4d20d60 | 485 | from = (loff_t)startblock << this->bbt_erase_shift; |
1da177e4 | 486 | } |
61b03bd7 | 487 | |
5fb1549d | 488 | if (this->bbt_options & NAND_BBT_SCANLASTPAGE) |
eceb84b1 | 489 | from += mtd->erasesize - (mtd->writesize * numpages); |
b60b08b0 | 490 | |
b4d20d60 | 491 | for (i = startblock; i < numblocks; i++) { |
eeada24d | 492 | int ret; |
61b03bd7 | 493 | |
7cba7b14 SAS |
494 | BUG_ON(bd->options & NAND_BBT_NO_OOB); |
495 | ||
5961ad2c | 496 | ret = scan_block_fast(mtd, bd, from, buf, numpages); |
8593fbc6 TG |
497 | if (ret < 0) |
498 | return ret; | |
499 | ||
500 | if (ret) { | |
b4d20d60 | 501 | bbt_mark_entry(this, i, BBT_BLOCK_FACTORY_BAD); |
9a4d4d69 | 502 | pr_warn("Bad eraseblock %d at 0x%012llx\n", |
b4d20d60 | 503 | i, (unsigned long long)from); |
f1a28c02 | 504 | mtd->ecc_stats.badblocks++; |
1da177e4 | 505 | } |
8593fbc6 | 506 | |
1da177e4 LT |
507 | from += (1 << this->bbt_erase_shift); |
508 | } | |
eeada24d | 509 | return 0; |
1da177e4 LT |
510 | } |
511 | ||
512 | /** | |
513 | * search_bbt - [GENERIC] scan the device for a specific bad block table | |
8b6e50c9 BN |
514 | * @mtd: MTD device structure |
515 | * @buf: temporary buffer | |
516 | * @td: descriptor for the bad block table | |
1da177e4 | 517 | * |
8b6e50c9 BN |
518 | * Read the bad block table by searching for a given ident pattern. Search is |
519 | * preformed either from the beginning up or from the end of the device | |
520 | * downwards. The search starts always at the start of a block. If the option | |
521 | * NAND_BBT_PERCHIP is given, each chip is searched for a bbt, which contains | |
522 | * the bad block information of this chip. This is necessary to provide support | |
523 | * for certain DOC devices. | |
1da177e4 | 524 | * |
8b6e50c9 | 525 | * The bbt ident pattern resides in the oob area of the first page in a block. |
1da177e4 | 526 | */ |
e0c7d767 | 527 | static int search_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td) |
1da177e4 LT |
528 | { |
529 | struct nand_chip *this = mtd->priv; | |
530 | int i, chips; | |
930de537 | 531 | int startblock, block, dir; |
28318776 | 532 | int scanlen = mtd->writesize + mtd->oobsize; |
1da177e4 | 533 | int bbtblocks; |
8593fbc6 | 534 | int blocktopage = this->bbt_erase_shift - this->page_shift; |
1da177e4 | 535 | |
8b6e50c9 | 536 | /* Search direction top -> down? */ |
1da177e4 | 537 | if (td->options & NAND_BBT_LASTBLOCK) { |
e0c7d767 | 538 | startblock = (mtd->size >> this->bbt_erase_shift) - 1; |
1da177e4 LT |
539 | dir = -1; |
540 | } else { | |
61b03bd7 | 541 | startblock = 0; |
1da177e4 | 542 | dir = 1; |
61b03bd7 TG |
543 | } |
544 | ||
8b6e50c9 | 545 | /* Do we have a bbt per chip? */ |
1da177e4 LT |
546 | if (td->options & NAND_BBT_PERCHIP) { |
547 | chips = this->numchips; | |
548 | bbtblocks = this->chipsize >> this->bbt_erase_shift; | |
549 | startblock &= bbtblocks - 1; | |
550 | } else { | |
551 | chips = 1; | |
552 | bbtblocks = mtd->size >> this->bbt_erase_shift; | |
553 | } | |
61b03bd7 | 554 | |
1da177e4 LT |
555 | for (i = 0; i < chips; i++) { |
556 | /* Reset version information */ | |
61b03bd7 | 557 | td->version[i] = 0; |
1da177e4 LT |
558 | td->pages[i] = -1; |
559 | /* Scan the maximum number of blocks */ | |
560 | for (block = 0; block < td->maxblocks; block++) { | |
8593fbc6 | 561 | |
1da177e4 | 562 | int actblock = startblock + dir * block; |
69423d99 | 563 | loff_t offs = (loff_t)actblock << this->bbt_erase_shift; |
8593fbc6 | 564 | |
1da177e4 | 565 | /* Read first page */ |
af69dcd3 | 566 | scan_read(mtd, buf, offs, mtd->writesize, td); |
28318776 | 567 | if (!check_pattern(buf, scanlen, mtd->writesize, td)) { |
8593fbc6 | 568 | td->pages[i] = actblock << blocktopage; |
1da177e4 | 569 | if (td->options & NAND_BBT_VERSION) { |
7cba7b14 SAS |
570 | offs = bbt_get_ver_offs(mtd, td); |
571 | td->version[i] = buf[offs]; | |
1da177e4 LT |
572 | } |
573 | break; | |
574 | } | |
575 | } | |
576 | startblock += this->chipsize >> this->bbt_erase_shift; | |
577 | } | |
578 | /* Check, if we found a bbt for each requested chip */ | |
579 | for (i = 0; i < chips; i++) { | |
580 | if (td->pages[i] == -1) | |
9a4d4d69 | 581 | pr_warn("Bad block table not found for chip %d\n", i); |
1da177e4 | 582 | else |
2ac63d90 RM |
583 | pr_info("Bad block table found at page %d, version 0x%02X\n", |
584 | td->pages[i], td->version[i]); | |
1da177e4 | 585 | } |
61b03bd7 | 586 | return 0; |
1da177e4 LT |
587 | } |
588 | ||
589 | /** | |
590 | * search_read_bbts - [GENERIC] scan the device for bad block table(s) | |
8b6e50c9 BN |
591 | * @mtd: MTD device structure |
592 | * @buf: temporary buffer | |
593 | * @td: descriptor for the bad block table | |
594 | * @md: descriptor for the bad block table mirror | |
1da177e4 | 595 | * |
8b6e50c9 BN |
596 | * Search and read the bad block table(s). |
597 | */ | |
7b5a2d40 BN |
598 | static void search_read_bbts(struct mtd_info *mtd, uint8_t *buf, |
599 | struct nand_bbt_descr *td, | |
600 | struct nand_bbt_descr *md) | |
1da177e4 LT |
601 | { |
602 | /* Search the primary table */ | |
e0c7d767 | 603 | search_bbt(mtd, buf, td); |
61b03bd7 | 604 | |
1da177e4 LT |
605 | /* Search the mirror table */ |
606 | if (md) | |
e0c7d767 | 607 | search_bbt(mtd, buf, md); |
1da177e4 | 608 | } |
1da177e4 | 609 | |
61b03bd7 | 610 | /** |
1da177e4 | 611 | * write_bbt - [GENERIC] (Re)write the bad block table |
8b6e50c9 BN |
612 | * @mtd: MTD device structure |
613 | * @buf: temporary buffer | |
614 | * @td: descriptor for the bad block table | |
615 | * @md: descriptor for the bad block table mirror | |
616 | * @chipsel: selector for a specific chip, -1 for all | |
1da177e4 | 617 | * |
8b6e50c9 BN |
618 | * (Re)write the bad block table. |
619 | */ | |
e0c7d767 | 620 | static int write_bbt(struct mtd_info *mtd, uint8_t *buf, |
9223a456 TG |
621 | struct nand_bbt_descr *td, struct nand_bbt_descr *md, |
622 | int chipsel) | |
1da177e4 LT |
623 | { |
624 | struct nand_chip *this = mtd->priv; | |
1da177e4 | 625 | struct erase_info einfo; |
b4d20d60 | 626 | int i, res, chip = 0; |
1da177e4 | 627 | int bits, startblock, dir, page, offs, numblocks, sft, sftmsk; |
b4d20d60 | 628 | int nrchips, pageoffs, ooboffs; |
1da177e4 LT |
629 | uint8_t msk[4]; |
630 | uint8_t rcode = td->reserved_block_code; | |
8593fbc6 | 631 | size_t retlen, len = 0; |
1da177e4 | 632 | loff_t to; |
8593fbc6 TG |
633 | struct mtd_oob_ops ops; |
634 | ||
635 | ops.ooblen = mtd->oobsize; | |
636 | ops.ooboffs = 0; | |
637 | ops.datbuf = NULL; | |
0612b9dd | 638 | ops.mode = MTD_OPS_PLACE_OOB; |
1da177e4 LT |
639 | |
640 | if (!rcode) | |
641 | rcode = 0xff; | |
8b6e50c9 | 642 | /* Write bad block table per chip rather than per device? */ |
1da177e4 | 643 | if (td->options & NAND_BBT_PERCHIP) { |
e0c7d767 | 644 | numblocks = (int)(this->chipsize >> this->bbt_erase_shift); |
8b6e50c9 | 645 | /* Full device write or specific chip? */ |
1da177e4 LT |
646 | if (chipsel == -1) { |
647 | nrchips = this->numchips; | |
648 | } else { | |
649 | nrchips = chipsel + 1; | |
650 | chip = chipsel; | |
651 | } | |
652 | } else { | |
e0c7d767 | 653 | numblocks = (int)(mtd->size >> this->bbt_erase_shift); |
1da177e4 | 654 | nrchips = 1; |
61b03bd7 TG |
655 | } |
656 | ||
1da177e4 LT |
657 | /* Loop through the chips */ |
658 | for (; chip < nrchips; chip++) { | |
8b6e50c9 BN |
659 | /* |
660 | * There was already a version of the table, reuse the page | |
61b03bd7 | 661 | * This applies for absolute placement too, as we have the |
1da177e4 LT |
662 | * page nr. in td->pages. |
663 | */ | |
664 | if (td->pages[chip] != -1) { | |
665 | page = td->pages[chip]; | |
666 | goto write; | |
61b03bd7 | 667 | } |
1da177e4 | 668 | |
8b6e50c9 BN |
669 | /* |
670 | * Automatic placement of the bad block table. Search direction | |
671 | * top -> down? | |
672 | */ | |
1da177e4 LT |
673 | if (td->options & NAND_BBT_LASTBLOCK) { |
674 | startblock = numblocks * (chip + 1) - 1; | |
675 | dir = -1; | |
676 | } else { | |
677 | startblock = chip * numblocks; | |
678 | dir = 1; | |
61b03bd7 | 679 | } |
1da177e4 LT |
680 | |
681 | for (i = 0; i < td->maxblocks; i++) { | |
682 | int block = startblock + dir * i; | |
683 | /* Check, if the block is bad */ | |
771c568b BN |
684 | switch (bbt_get_entry(this, block)) { |
685 | case BBT_BLOCK_WORN: | |
686 | case BBT_BLOCK_FACTORY_BAD: | |
1da177e4 LT |
687 | continue; |
688 | } | |
9223a456 TG |
689 | page = block << |
690 | (this->bbt_erase_shift - this->page_shift); | |
1da177e4 LT |
691 | /* Check, if the block is used by the mirror table */ |
692 | if (!md || md->pages[chip] != page) | |
693 | goto write; | |
694 | } | |
9a4d4d69 | 695 | pr_err("No space left to write bad block table\n"); |
1da177e4 | 696 | return -ENOSPC; |
e0c7d767 | 697 | write: |
1da177e4 LT |
698 | |
699 | /* Set up shift count and masks for the flash table */ | |
700 | bits = td->options & NAND_BBT_NRBITS_MSK; | |
9223a456 | 701 | msk[2] = ~rcode; |
1da177e4 | 702 | switch (bits) { |
9223a456 TG |
703 | case 1: sft = 3; sftmsk = 0x07; msk[0] = 0x00; msk[1] = 0x01; |
704 | msk[3] = 0x01; | |
705 | break; | |
706 | case 2: sft = 2; sftmsk = 0x06; msk[0] = 0x00; msk[1] = 0x01; | |
707 | msk[3] = 0x03; | |
708 | break; | |
709 | case 4: sft = 1; sftmsk = 0x04; msk[0] = 0x00; msk[1] = 0x0C; | |
710 | msk[3] = 0x0f; | |
711 | break; | |
712 | case 8: sft = 0; sftmsk = 0x00; msk[0] = 0x00; msk[1] = 0x0F; | |
713 | msk[3] = 0xff; | |
714 | break; | |
1da177e4 LT |
715 | default: return -EINVAL; |
716 | } | |
61b03bd7 | 717 | |
596d7452 | 718 | to = ((loff_t)page) << this->page_shift; |
1da177e4 | 719 | |
8b6e50c9 | 720 | /* Must we save the block contents? */ |
1da177e4 LT |
721 | if (td->options & NAND_BBT_SAVECONTENT) { |
722 | /* Make it block aligned */ | |
596d7452 | 723 | to &= ~((loff_t)((1 << this->bbt_erase_shift) - 1)); |
1da177e4 | 724 | len = 1 << this->bbt_erase_shift; |
329ad399 | 725 | res = mtd_read(mtd, to, len, &retlen, buf); |
1da177e4 LT |
726 | if (res < 0) { |
727 | if (retlen != len) { | |
2ac63d90 | 728 | pr_info("nand_bbt: error reading block for writing the bad block table\n"); |
1da177e4 LT |
729 | return res; |
730 | } | |
2ac63d90 | 731 | pr_warn("nand_bbt: ECC error while reading block for writing bad block table\n"); |
1da177e4 | 732 | } |
9223a456 | 733 | /* Read oob data */ |
7014568b | 734 | ops.ooblen = (len >> this->page_shift) * mtd->oobsize; |
8593fbc6 | 735 | ops.oobbuf = &buf[len]; |
fd2819bb | 736 | res = mtd_read_oob(mtd, to + mtd->writesize, &ops); |
7014568b | 737 | if (res < 0 || ops.oobretlen != ops.ooblen) |
9223a456 TG |
738 | goto outerr; |
739 | ||
1da177e4 LT |
740 | /* Calc the byte offset in the buffer */ |
741 | pageoffs = page - (int)(to >> this->page_shift); | |
742 | offs = pageoffs << this->page_shift; | |
743 | /* Preset the bbt area with 0xff */ | |
596d7452 | 744 | memset(&buf[offs], 0xff, (size_t)(numblocks >> sft)); |
9223a456 TG |
745 | ooboffs = len + (pageoffs * mtd->oobsize); |
746 | ||
7cba7b14 SAS |
747 | } else if (td->options & NAND_BBT_NO_OOB) { |
748 | ooboffs = 0; | |
749 | offs = td->len; | |
8b6e50c9 | 750 | /* The version byte */ |
7cba7b14 SAS |
751 | if (td->options & NAND_BBT_VERSION) |
752 | offs++; | |
753 | /* Calc length */ | |
596d7452 | 754 | len = (size_t)(numblocks >> sft); |
7cba7b14 | 755 | len += offs; |
8b6e50c9 | 756 | /* Make it page aligned! */ |
7cba7b14 SAS |
757 | len = ALIGN(len, mtd->writesize); |
758 | /* Preset the buffer with 0xff */ | |
759 | memset(buf, 0xff, len); | |
760 | /* Pattern is located at the begin of first page */ | |
761 | memcpy(buf, td->pattern, td->len); | |
1da177e4 LT |
762 | } else { |
763 | /* Calc length */ | |
596d7452 | 764 | len = (size_t)(numblocks >> sft); |
8b6e50c9 | 765 | /* Make it page aligned! */ |
cda32091 | 766 | len = ALIGN(len, mtd->writesize); |
1da177e4 | 767 | /* Preset the buffer with 0xff */ |
9223a456 TG |
768 | memset(buf, 0xff, len + |
769 | (len >> this->page_shift)* mtd->oobsize); | |
1da177e4 | 770 | offs = 0; |
9223a456 | 771 | ooboffs = len; |
1da177e4 | 772 | /* Pattern is located in oob area of first page */ |
9223a456 | 773 | memcpy(&buf[ooboffs + td->offs], td->pattern, td->len); |
1da177e4 | 774 | } |
61b03bd7 | 775 | |
9223a456 TG |
776 | if (td->options & NAND_BBT_VERSION) |
777 | buf[ooboffs + td->veroffs] = td->version[chip]; | |
778 | ||
8b6e50c9 | 779 | /* Walk through the memory table */ |
b4d20d60 | 780 | for (i = 0; i < numblocks; i++) { |
1da177e4 | 781 | uint8_t dat; |
b4d20d60 BN |
782 | int sftcnt = (i << (3 - sft)) & sftmsk; |
783 | dat = bbt_get_entry(this, chip * numblocks + i); | |
784 | /* Do not store the reserved bbt blocks! */ | |
785 | buf[offs + (i >> sft)] &= ~(msk[dat] << sftcnt); | |
1da177e4 | 786 | } |
61b03bd7 | 787 | |
e0c7d767 | 788 | memset(&einfo, 0, sizeof(einfo)); |
1da177e4 | 789 | einfo.mtd = mtd; |
69423d99 | 790 | einfo.addr = to; |
1da177e4 | 791 | einfo.len = 1 << this->bbt_erase_shift; |
e0c7d767 | 792 | res = nand_erase_nand(mtd, &einfo, 1); |
9223a456 TG |
793 | if (res < 0) |
794 | goto outerr; | |
61b03bd7 | 795 | |
7cba7b14 SAS |
796 | res = scan_write_bbt(mtd, to, len, buf, |
797 | td->options & NAND_BBT_NO_OOB ? NULL : | |
798 | &buf[len]); | |
9223a456 TG |
799 | if (res < 0) |
800 | goto outerr; | |
801 | ||
d0370219 BN |
802 | pr_info("Bad block table written to 0x%012llx, version 0x%02X\n", |
803 | (unsigned long long)to, td->version[chip]); | |
61b03bd7 | 804 | |
1da177e4 LT |
805 | /* Mark it as used */ |
806 | td->pages[chip] = page; | |
61b03bd7 | 807 | } |
1da177e4 | 808 | return 0; |
9223a456 TG |
809 | |
810 | outerr: | |
d0370219 | 811 | pr_warn("nand_bbt: error while writing bad block table %d\n", res); |
9223a456 | 812 | return res; |
1da177e4 LT |
813 | } |
814 | ||
815 | /** | |
816 | * nand_memory_bbt - [GENERIC] create a memory based bad block table | |
8b6e50c9 BN |
817 | * @mtd: MTD device structure |
818 | * @bd: descriptor for the good/bad block search pattern | |
1da177e4 | 819 | * |
8b6e50c9 BN |
820 | * The function creates a memory based bbt by scanning the device for |
821 | * manufacturer / software marked good / bad blocks. | |
822 | */ | |
e0c7d767 | 823 | static inline int nand_memory_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd) |
1da177e4 LT |
824 | { |
825 | struct nand_chip *this = mtd->priv; | |
826 | ||
4bf63fcb | 827 | return create_bbt(mtd, this->buffers->databuf, bd, -1); |
1da177e4 LT |
828 | } |
829 | ||
830 | /** | |
e0c7d767 | 831 | * check_create - [GENERIC] create and write bbt(s) if necessary |
8b6e50c9 BN |
832 | * @mtd: MTD device structure |
833 | * @buf: temporary buffer | |
834 | * @bd: descriptor for the good/bad block search pattern | |
1da177e4 | 835 | * |
8b6e50c9 BN |
836 | * The function checks the results of the previous call to read_bbt and creates |
837 | * / updates the bbt(s) if necessary. Creation is necessary if no bbt was found | |
838 | * for the chip/device. Update is necessary if one of the tables is missing or | |
839 | * the version nr. of one table is less than the other. | |
840 | */ | |
e0c7d767 | 841 | static int check_create(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *bd) |
1da177e4 | 842 | { |
623978de | 843 | int i, chips, writeops, create, chipsel, res, res2; |
1da177e4 LT |
844 | struct nand_chip *this = mtd->priv; |
845 | struct nand_bbt_descr *td = this->bbt_td; | |
846 | struct nand_bbt_descr *md = this->bbt_md; | |
847 | struct nand_bbt_descr *rd, *rd2; | |
848 | ||
8b6e50c9 | 849 | /* Do we have a bbt per chip? */ |
61b03bd7 | 850 | if (td->options & NAND_BBT_PERCHIP) |
1da177e4 | 851 | chips = this->numchips; |
61b03bd7 | 852 | else |
1da177e4 | 853 | chips = 1; |
61b03bd7 | 854 | |
1da177e4 LT |
855 | for (i = 0; i < chips; i++) { |
856 | writeops = 0; | |
b61bf5bb | 857 | create = 0; |
1da177e4 LT |
858 | rd = NULL; |
859 | rd2 = NULL; | |
623978de | 860 | res = res2 = 0; |
8b6e50c9 | 861 | /* Per chip or per device? */ |
1da177e4 | 862 | chipsel = (td->options & NAND_BBT_PERCHIP) ? i : -1; |
8b6e50c9 | 863 | /* Mirrored table available? */ |
1da177e4 LT |
864 | if (md) { |
865 | if (td->pages[i] == -1 && md->pages[i] == -1) { | |
b61bf5bb | 866 | create = 1; |
1da177e4 | 867 | writeops = 0x03; |
c5e8ef9c | 868 | } else if (td->pages[i] == -1) { |
61b03bd7 | 869 | rd = md; |
596d7452 | 870 | writeops = 0x01; |
c5e8ef9c | 871 | } else if (md->pages[i] == -1) { |
1da177e4 | 872 | rd = td; |
596d7452 | 873 | writeops = 0x02; |
c5e8ef9c | 874 | } else if (td->version[i] == md->version[i]) { |
1da177e4 LT |
875 | rd = td; |
876 | if (!(td->options & NAND_BBT_VERSION)) | |
877 | rd2 = md; | |
c5e8ef9c | 878 | } else if (((int8_t)(td->version[i] - md->version[i])) > 0) { |
1da177e4 | 879 | rd = td; |
596d7452 | 880 | writeops = 0x02; |
1da177e4 LT |
881 | } else { |
882 | rd = md; | |
596d7452 | 883 | writeops = 0x01; |
1da177e4 | 884 | } |
1da177e4 LT |
885 | } else { |
886 | if (td->pages[i] == -1) { | |
b61bf5bb | 887 | create = 1; |
1da177e4 | 888 | writeops = 0x01; |
b61bf5bb BN |
889 | } else { |
890 | rd = td; | |
1da177e4 | 891 | } |
1da177e4 | 892 | } |
61b03bd7 | 893 | |
b61bf5bb BN |
894 | if (create) { |
895 | /* Create the bad block table by scanning the device? */ | |
896 | if (!(td->options & NAND_BBT_CREATE)) | |
897 | continue; | |
898 | ||
899 | /* Create the table in memory by scanning the chip(s) */ | |
900 | if (!(this->bbt_options & NAND_BBT_CREATE_EMPTY)) | |
901 | create_bbt(mtd, buf, bd, chipsel); | |
902 | ||
903 | td->version[i] = 1; | |
904 | if (md) | |
905 | md->version[i] = 1; | |
906 | } | |
907 | ||
8b6e50c9 | 908 | /* Read back first? */ |
623978de BN |
909 | if (rd) { |
910 | res = read_abs_bbt(mtd, buf, rd, chipsel); | |
911 | if (mtd_is_eccerr(res)) { | |
912 | /* Mark table as invalid */ | |
913 | rd->pages[i] = -1; | |
dadc17a3 | 914 | rd->version[i] = 0; |
623978de BN |
915 | i--; |
916 | continue; | |
917 | } | |
918 | } | |
8b6e50c9 | 919 | /* If they weren't versioned, read both */ |
623978de BN |
920 | if (rd2) { |
921 | res2 = read_abs_bbt(mtd, buf, rd2, chipsel); | |
922 | if (mtd_is_eccerr(res2)) { | |
923 | /* Mark table as invalid */ | |
924 | rd2->pages[i] = -1; | |
dadc17a3 | 925 | rd2->version[i] = 0; |
623978de BN |
926 | i--; |
927 | continue; | |
928 | } | |
929 | } | |
930 | ||
931 | /* Scrub the flash table(s)? */ | |
932 | if (mtd_is_bitflip(res) || mtd_is_bitflip(res2)) | |
933 | writeops = 0x03; | |
1da177e4 | 934 | |
dadc17a3 BN |
935 | /* Update version numbers before writing */ |
936 | if (md) { | |
937 | td->version[i] = max(td->version[i], md->version[i]); | |
938 | md->version[i] = td->version[i]; | |
939 | } | |
940 | ||
8b6e50c9 | 941 | /* Write the bad block table to the device? */ |
1da177e4 | 942 | if ((writeops & 0x01) && (td->options & NAND_BBT_WRITE)) { |
e0c7d767 | 943 | res = write_bbt(mtd, buf, td, md, chipsel); |
1da177e4 LT |
944 | if (res < 0) |
945 | return res; | |
946 | } | |
61b03bd7 | 947 | |
8b6e50c9 | 948 | /* Write the mirror bad block table to the device? */ |
1da177e4 | 949 | if ((writeops & 0x02) && md && (md->options & NAND_BBT_WRITE)) { |
e0c7d767 | 950 | res = write_bbt(mtd, buf, md, td, chipsel); |
1da177e4 LT |
951 | if (res < 0) |
952 | return res; | |
953 | } | |
954 | } | |
61b03bd7 | 955 | return 0; |
1da177e4 LT |
956 | } |
957 | ||
958 | /** | |
61b03bd7 | 959 | * mark_bbt_regions - [GENERIC] mark the bad block table regions |
8b6e50c9 BN |
960 | * @mtd: MTD device structure |
961 | * @td: bad block table descriptor | |
1da177e4 | 962 | * |
8b6e50c9 BN |
963 | * The bad block table regions are marked as "bad" to prevent accidental |
964 | * erasures / writes. The regions are identified by the mark 0x02. | |
965 | */ | |
e0c7d767 | 966 | static void mark_bbt_region(struct mtd_info *mtd, struct nand_bbt_descr *td) |
1da177e4 LT |
967 | { |
968 | struct nand_chip *this = mtd->priv; | |
969 | int i, j, chips, block, nrblocks, update; | |
771c568b | 970 | uint8_t oldval; |
1da177e4 | 971 | |
8b6e50c9 | 972 | /* Do we have a bbt per chip? */ |
1da177e4 LT |
973 | if (td->options & NAND_BBT_PERCHIP) { |
974 | chips = this->numchips; | |
975 | nrblocks = (int)(this->chipsize >> this->bbt_erase_shift); | |
976 | } else { | |
977 | chips = 1; | |
978 | nrblocks = (int)(mtd->size >> this->bbt_erase_shift); | |
61b03bd7 TG |
979 | } |
980 | ||
1da177e4 LT |
981 | for (i = 0; i < chips; i++) { |
982 | if ((td->options & NAND_BBT_ABSPAGE) || | |
983 | !(td->options & NAND_BBT_WRITE)) { | |
e0c7d767 DW |
984 | if (td->pages[i] == -1) |
985 | continue; | |
1da177e4 | 986 | block = td->pages[i] >> (this->bbt_erase_shift - this->page_shift); |
b4d20d60 BN |
987 | oldval = bbt_get_entry(this, block); |
988 | bbt_mark_entry(this, block, BBT_BLOCK_RESERVED); | |
771c568b BN |
989 | if ((oldval != BBT_BLOCK_RESERVED) && |
990 | td->reserved_block_code) | |
b4d20d60 BN |
991 | nand_update_bbt(mtd, (loff_t)block << |
992 | this->bbt_erase_shift); | |
1da177e4 LT |
993 | continue; |
994 | } | |
995 | update = 0; | |
996 | if (td->options & NAND_BBT_LASTBLOCK) | |
997 | block = ((i + 1) * nrblocks) - td->maxblocks; | |
61b03bd7 | 998 | else |
1da177e4 | 999 | block = i * nrblocks; |
1da177e4 | 1000 | for (j = 0; j < td->maxblocks; j++) { |
b4d20d60 BN |
1001 | oldval = bbt_get_entry(this, block); |
1002 | bbt_mark_entry(this, block, BBT_BLOCK_RESERVED); | |
771c568b | 1003 | if (oldval != BBT_BLOCK_RESERVED) |
e0c7d767 | 1004 | update = 1; |
b4d20d60 | 1005 | block++; |
61b03bd7 | 1006 | } |
8b6e50c9 BN |
1007 | /* |
1008 | * If we want reserved blocks to be recorded to flash, and some | |
1009 | * new ones have been marked, then we need to update the stored | |
1010 | * bbts. This should only happen once. | |
1011 | */ | |
1da177e4 | 1012 | if (update && td->reserved_block_code) |
b4d20d60 BN |
1013 | nand_update_bbt(mtd, (loff_t)(block - 1) << |
1014 | this->bbt_erase_shift); | |
1da177e4 LT |
1015 | } |
1016 | } | |
1017 | ||
7cba7b14 SAS |
1018 | /** |
1019 | * verify_bbt_descr - verify the bad block description | |
8b6e50c9 BN |
1020 | * @mtd: MTD device structure |
1021 | * @bd: the table to verify | |
7cba7b14 SAS |
1022 | * |
1023 | * This functions performs a few sanity checks on the bad block description | |
1024 | * table. | |
1025 | */ | |
1026 | static void verify_bbt_descr(struct mtd_info *mtd, struct nand_bbt_descr *bd) | |
1027 | { | |
1028 | struct nand_chip *this = mtd->priv; | |
7912a5e7 SF |
1029 | u32 pattern_len; |
1030 | u32 bits; | |
7cba7b14 SAS |
1031 | u32 table_size; |
1032 | ||
1033 | if (!bd) | |
1034 | return; | |
7912a5e7 SF |
1035 | |
1036 | pattern_len = bd->len; | |
1037 | bits = bd->options & NAND_BBT_NRBITS_MSK; | |
1038 | ||
a40f7341 | 1039 | BUG_ON((this->bbt_options & NAND_BBT_NO_OOB) && |
bb9ebd4e | 1040 | !(this->bbt_options & NAND_BBT_USE_FLASH)); |
7cba7b14 SAS |
1041 | BUG_ON(!bits); |
1042 | ||
1043 | if (bd->options & NAND_BBT_VERSION) | |
1044 | pattern_len++; | |
1045 | ||
1046 | if (bd->options & NAND_BBT_NO_OOB) { | |
bb9ebd4e | 1047 | BUG_ON(!(this->bbt_options & NAND_BBT_USE_FLASH)); |
a40f7341 | 1048 | BUG_ON(!(this->bbt_options & NAND_BBT_NO_OOB)); |
7cba7b14 SAS |
1049 | BUG_ON(bd->offs); |
1050 | if (bd->options & NAND_BBT_VERSION) | |
1051 | BUG_ON(bd->veroffs != bd->len); | |
1052 | BUG_ON(bd->options & NAND_BBT_SAVECONTENT); | |
1053 | } | |
1054 | ||
1055 | if (bd->options & NAND_BBT_PERCHIP) | |
1056 | table_size = this->chipsize >> this->bbt_erase_shift; | |
1057 | else | |
1058 | table_size = mtd->size >> this->bbt_erase_shift; | |
1059 | table_size >>= 3; | |
1060 | table_size *= bits; | |
1061 | if (bd->options & NAND_BBT_NO_OOB) | |
1062 | table_size += pattern_len; | |
1063 | BUG_ON(table_size > (1 << this->bbt_erase_shift)); | |
1064 | } | |
1065 | ||
1da177e4 LT |
1066 | /** |
1067 | * nand_scan_bbt - [NAND Interface] scan, find, read and maybe create bad block table(s) | |
8b6e50c9 BN |
1068 | * @mtd: MTD device structure |
1069 | * @bd: descriptor for the good/bad block search pattern | |
1da177e4 | 1070 | * |
8b6e50c9 BN |
1071 | * The function checks, if a bad block table(s) is/are already available. If |
1072 | * not it scans the device for manufacturer marked good / bad blocks and writes | |
1073 | * the bad block table(s) to the selected place. | |
1da177e4 | 1074 | * |
8b6e50c9 BN |
1075 | * The bad block table memory is allocated here. It must be freed by calling |
1076 | * the nand_free_bbt function. | |
1077 | */ | |
e0c7d767 | 1078 | int nand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd) |
1da177e4 LT |
1079 | { |
1080 | struct nand_chip *this = mtd->priv; | |
1081 | int len, res = 0; | |
1082 | uint8_t *buf; | |
1083 | struct nand_bbt_descr *td = this->bbt_td; | |
1084 | struct nand_bbt_descr *md = this->bbt_md; | |
1085 | ||
1086 | len = mtd->size >> (this->bbt_erase_shift + 2); | |
8b6e50c9 BN |
1087 | /* |
1088 | * Allocate memory (2bit per block) and clear the memory bad block | |
1089 | * table. | |
1090 | */ | |
95b93a0c | 1091 | this->bbt = kzalloc(len, GFP_KERNEL); |
0870066d | 1092 | if (!this->bbt) |
1da177e4 | 1093 | return -ENOMEM; |
1da177e4 | 1094 | |
8b6e50c9 BN |
1095 | /* |
1096 | * If no primary table decriptor is given, scan the device to build a | |
1097 | * memory based bad block table. | |
1da177e4 | 1098 | */ |
eeada24d AB |
1099 | if (!td) { |
1100 | if ((res = nand_memory_bbt(mtd, bd))) { | |
d0370219 | 1101 | pr_err("nand_bbt: can't scan flash and build the RAM-based BBT\n"); |
e0c7d767 | 1102 | kfree(this->bbt); |
eeada24d AB |
1103 | this->bbt = NULL; |
1104 | } | |
1105 | return res; | |
1106 | } | |
7cba7b14 SAS |
1107 | verify_bbt_descr(mtd, td); |
1108 | verify_bbt_descr(mtd, md); | |
1da177e4 LT |
1109 | |
1110 | /* Allocate a temporary buffer for one eraseblock incl. oob */ | |
1111 | len = (1 << this->bbt_erase_shift); | |
1112 | len += (len >> this->page_shift) * mtd->oobsize; | |
c3f8abf4 | 1113 | buf = vmalloc(len); |
1da177e4 | 1114 | if (!buf) { |
e0c7d767 | 1115 | kfree(this->bbt); |
1da177e4 LT |
1116 | this->bbt = NULL; |
1117 | return -ENOMEM; | |
1118 | } | |
61b03bd7 | 1119 | |
8b6e50c9 | 1120 | /* Is the bbt at a given page? */ |
1da177e4 | 1121 | if (td->options & NAND_BBT_ABSPAGE) { |
7b5a2d40 | 1122 | read_abs_bbts(mtd, buf, td, md); |
61b03bd7 | 1123 | } else { |
1da177e4 | 1124 | /* Search the bad block table using a pattern in oob */ |
7b5a2d40 | 1125 | search_read_bbts(mtd, buf, td, md); |
61b03bd7 | 1126 | } |
1da177e4 | 1127 | |
7b5a2d40 | 1128 | res = check_create(mtd, buf, bd); |
61b03bd7 | 1129 | |
1da177e4 | 1130 | /* Prevent the bbt regions from erasing / writing */ |
e0c7d767 | 1131 | mark_bbt_region(mtd, td); |
1da177e4 | 1132 | if (md) |
e0c7d767 | 1133 | mark_bbt_region(mtd, md); |
61b03bd7 | 1134 | |
e0c7d767 | 1135 | vfree(buf); |
1da177e4 LT |
1136 | return res; |
1137 | } | |
1138 | ||
1da177e4 | 1139 | /** |
b32843b7 | 1140 | * nand_update_bbt - update bad block table(s) |
8b6e50c9 BN |
1141 | * @mtd: MTD device structure |
1142 | * @offs: the offset of the newly marked block | |
1da177e4 | 1143 | * |
8b6e50c9 BN |
1144 | * The function updates the bad block table(s). |
1145 | */ | |
b32843b7 | 1146 | static int nand_update_bbt(struct mtd_info *mtd, loff_t offs) |
1da177e4 LT |
1147 | { |
1148 | struct nand_chip *this = mtd->priv; | |
1196ac5a | 1149 | int len, res = 0; |
1da177e4 LT |
1150 | int chip, chipsel; |
1151 | uint8_t *buf; | |
1152 | struct nand_bbt_descr *td = this->bbt_td; | |
1153 | struct nand_bbt_descr *md = this->bbt_md; | |
1154 | ||
1155 | if (!this->bbt || !td) | |
1156 | return -EINVAL; | |
1157 | ||
1da177e4 LT |
1158 | /* Allocate a temporary buffer for one eraseblock incl. oob */ |
1159 | len = (1 << this->bbt_erase_shift); | |
1160 | len += (len >> this->page_shift) * mtd->oobsize; | |
e0c7d767 | 1161 | buf = kmalloc(len, GFP_KERNEL); |
0870066d | 1162 | if (!buf) |
1da177e4 | 1163 | return -ENOMEM; |
1da177e4 | 1164 | |
8b6e50c9 | 1165 | /* Do we have a bbt per chip? */ |
1da177e4 | 1166 | if (td->options & NAND_BBT_PERCHIP) { |
e0c7d767 | 1167 | chip = (int)(offs >> this->chip_shift); |
1da177e4 LT |
1168 | chipsel = chip; |
1169 | } else { | |
1170 | chip = 0; | |
1171 | chipsel = -1; | |
1172 | } | |
1173 | ||
1174 | td->version[chip]++; | |
1175 | if (md) | |
61b03bd7 | 1176 | md->version[chip]++; |
1da177e4 | 1177 | |
8b6e50c9 | 1178 | /* Write the bad block table to the device? */ |
1196ac5a | 1179 | if (td->options & NAND_BBT_WRITE) { |
e0c7d767 | 1180 | res = write_bbt(mtd, buf, td, md, chipsel); |
1da177e4 LT |
1181 | if (res < 0) |
1182 | goto out; | |
1183 | } | |
8b6e50c9 | 1184 | /* Write the mirror bad block table to the device? */ |
1196ac5a | 1185 | if (md && (md->options & NAND_BBT_WRITE)) { |
e0c7d767 | 1186 | res = write_bbt(mtd, buf, md, td, chipsel); |
1da177e4 LT |
1187 | } |
1188 | ||
e0c7d767 DW |
1189 | out: |
1190 | kfree(buf); | |
1da177e4 LT |
1191 | return res; |
1192 | } | |
1193 | ||
8b6e50c9 BN |
1194 | /* |
1195 | * Define some generic bad / good block scan pattern which are used | |
1196 | * while scanning a device for factory marked good / bad blocks. | |
1197 | */ | |
1da177e4 LT |
1198 | static uint8_t scan_ff_pattern[] = { 0xff, 0xff }; |
1199 | ||
7854d3f7 | 1200 | /* Generic flash bbt descriptors */ |
1da177e4 LT |
1201 | static uint8_t bbt_pattern[] = {'B', 'b', 't', '0' }; |
1202 | static uint8_t mirror_pattern[] = {'1', 't', 'b', 'B' }; | |
1203 | ||
1204 | static struct nand_bbt_descr bbt_main_descr = { | |
61b03bd7 | 1205 | .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
1da177e4 LT |
1206 | | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP, |
1207 | .offs = 8, | |
1208 | .len = 4, | |
1209 | .veroffs = 12, | |
61de9da6 | 1210 | .maxblocks = NAND_BBT_SCAN_MAXBLOCKS, |
1da177e4 LT |
1211 | .pattern = bbt_pattern |
1212 | }; | |
1213 | ||
1214 | static struct nand_bbt_descr bbt_mirror_descr = { | |
61b03bd7 | 1215 | .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
1da177e4 LT |
1216 | | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP, |
1217 | .offs = 8, | |
1218 | .len = 4, | |
1219 | .veroffs = 12, | |
61de9da6 | 1220 | .maxblocks = NAND_BBT_SCAN_MAXBLOCKS, |
1da177e4 LT |
1221 | .pattern = mirror_pattern |
1222 | }; | |
1223 | ||
9fd6b37a | 1224 | static struct nand_bbt_descr bbt_main_no_oob_descr = { |
7cba7b14 SAS |
1225 | .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
1226 | | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP | |
1227 | | NAND_BBT_NO_OOB, | |
1228 | .len = 4, | |
1229 | .veroffs = 4, | |
61de9da6 | 1230 | .maxblocks = NAND_BBT_SCAN_MAXBLOCKS, |
7cba7b14 SAS |
1231 | .pattern = bbt_pattern |
1232 | }; | |
1233 | ||
9fd6b37a | 1234 | static struct nand_bbt_descr bbt_mirror_no_oob_descr = { |
7cba7b14 SAS |
1235 | .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
1236 | | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP | |
1237 | | NAND_BBT_NO_OOB, | |
1238 | .len = 4, | |
1239 | .veroffs = 4, | |
61de9da6 | 1240 | .maxblocks = NAND_BBT_SCAN_MAXBLOCKS, |
7cba7b14 SAS |
1241 | .pattern = mirror_pattern |
1242 | }; | |
1243 | ||
752ed6c5 | 1244 | #define BADBLOCK_SCAN_MASK (~NAND_BBT_NO_OOB) |
58373ff0 | 1245 | /** |
752ed6c5 | 1246 | * nand_create_badblock_pattern - [INTERN] Creates a BBT descriptor structure |
8b6e50c9 | 1247 | * @this: NAND chip to create descriptor for |
58373ff0 BN |
1248 | * |
1249 | * This function allocates and initializes a nand_bbt_descr for BBM detection | |
752ed6c5 | 1250 | * based on the properties of @this. The new descriptor is stored in |
58373ff0 BN |
1251 | * this->badblock_pattern. Thus, this->badblock_pattern should be NULL when |
1252 | * passed to this function. | |
58373ff0 | 1253 | */ |
752ed6c5 | 1254 | static int nand_create_badblock_pattern(struct nand_chip *this) |
58373ff0 BN |
1255 | { |
1256 | struct nand_bbt_descr *bd; | |
1257 | if (this->badblock_pattern) { | |
752ed6c5 | 1258 | pr_warn("Bad block pattern already allocated; not replacing\n"); |
58373ff0 BN |
1259 | return -EINVAL; |
1260 | } | |
1261 | bd = kzalloc(sizeof(*bd), GFP_KERNEL); | |
0870066d | 1262 | if (!bd) |
58373ff0 | 1263 | return -ENOMEM; |
752ed6c5 | 1264 | bd->options = this->bbt_options & BADBLOCK_SCAN_MASK; |
58373ff0 BN |
1265 | bd->offs = this->badblockpos; |
1266 | bd->len = (this->options & NAND_BUSWIDTH_16) ? 2 : 1; | |
1267 | bd->pattern = scan_ff_pattern; | |
1268 | bd->options |= NAND_BBT_DYNAMICSTRUCT; | |
1269 | this->badblock_pattern = bd; | |
1270 | return 0; | |
1271 | } | |
1272 | ||
1da177e4 | 1273 | /** |
61b03bd7 | 1274 | * nand_default_bbt - [NAND Interface] Select a default bad block table for the device |
8b6e50c9 | 1275 | * @mtd: MTD device structure |
1da177e4 | 1276 | * |
8b6e50c9 BN |
1277 | * This function selects the default bad block table support for the device and |
1278 | * calls the nand_scan_bbt function. | |
1279 | */ | |
e0c7d767 | 1280 | int nand_default_bbt(struct mtd_info *mtd) |
1da177e4 LT |
1281 | { |
1282 | struct nand_chip *this = mtd->priv; | |
abb9cf78 | 1283 | int ret; |
61b03bd7 | 1284 | |
8b6e50c9 | 1285 | /* Is a flash based bad block table requested? */ |
bb9ebd4e | 1286 | if (this->bbt_options & NAND_BBT_USE_FLASH) { |
61b03bd7 TG |
1287 | /* Use the default pattern descriptors */ |
1288 | if (!this->bbt_td) { | |
a40f7341 | 1289 | if (this->bbt_options & NAND_BBT_NO_OOB) { |
9fd6b37a BN |
1290 | this->bbt_td = &bbt_main_no_oob_descr; |
1291 | this->bbt_md = &bbt_mirror_no_oob_descr; | |
7cba7b14 SAS |
1292 | } else { |
1293 | this->bbt_td = &bbt_main_descr; | |
1294 | this->bbt_md = &bbt_mirror_descr; | |
1295 | } | |
1da177e4 | 1296 | } |
1da177e4 LT |
1297 | } else { |
1298 | this->bbt_td = NULL; | |
1299 | this->bbt_md = NULL; | |
1da177e4 | 1300 | } |
a2f812df | 1301 | |
abb9cf78 BN |
1302 | if (!this->badblock_pattern) { |
1303 | ret = nand_create_badblock_pattern(this); | |
1304 | if (ret) | |
1305 | return ret; | |
1306 | } | |
a2f812df | 1307 | |
e0c7d767 | 1308 | return nand_scan_bbt(mtd, this->badblock_pattern); |
1da177e4 LT |
1309 | } |
1310 | ||
8471bb73 EG |
1311 | /** |
1312 | * nand_isreserved_bbt - [NAND Interface] Check if a block is reserved | |
1313 | * @mtd: MTD device structure | |
1314 | * @offs: offset in the device | |
1315 | */ | |
1316 | int nand_isreserved_bbt(struct mtd_info *mtd, loff_t offs) | |
1317 | { | |
1318 | struct nand_chip *this = mtd->priv; | |
1319 | int block; | |
1320 | ||
1321 | block = (int)(offs >> this->bbt_erase_shift); | |
1322 | return bbt_get_entry(this, block) == BBT_BLOCK_RESERVED; | |
1323 | } | |
1324 | ||
1da177e4 | 1325 | /** |
61b03bd7 | 1326 | * nand_isbad_bbt - [NAND Interface] Check if a block is bad |
8b6e50c9 BN |
1327 | * @mtd: MTD device structure |
1328 | * @offs: offset in the device | |
1329 | * @allowbbt: allow access to bad block table region | |
1330 | */ | |
e0c7d767 | 1331 | int nand_isbad_bbt(struct mtd_info *mtd, loff_t offs, int allowbbt) |
1da177e4 LT |
1332 | { |
1333 | struct nand_chip *this = mtd->priv; | |
39dbb029 | 1334 | int block, res; |
61b03bd7 | 1335 | |
b4d20d60 BN |
1336 | block = (int)(offs >> this->bbt_erase_shift); |
1337 | res = bbt_get_entry(this, block); | |
1da177e4 | 1338 | |
2ac63d90 RM |
1339 | pr_debug("nand_isbad_bbt(): bbt info for offs 0x%08x: (block %d) 0x%02x\n", |
1340 | (unsigned int)offs, block, res); | |
1da177e4 | 1341 | |
39dbb029 | 1342 | switch (res) { |
771c568b | 1343 | case BBT_BLOCK_GOOD: |
e0c7d767 | 1344 | return 0; |
771c568b | 1345 | case BBT_BLOCK_WORN: |
e0c7d767 | 1346 | return 1; |
771c568b | 1347 | case BBT_BLOCK_RESERVED: |
e0c7d767 | 1348 | return allowbbt ? 0 : 1; |
1da177e4 LT |
1349 | } |
1350 | return 1; | |
1351 | } | |
1352 | ||
b32843b7 BN |
1353 | /** |
1354 | * nand_markbad_bbt - [NAND Interface] Mark a block bad in the BBT | |
1355 | * @mtd: MTD device structure | |
1356 | * @offs: offset of the bad block | |
1357 | */ | |
1358 | int nand_markbad_bbt(struct mtd_info *mtd, loff_t offs) | |
1359 | { | |
1360 | struct nand_chip *this = mtd->priv; | |
1361 | int block, ret = 0; | |
1362 | ||
1363 | block = (int)(offs >> this->bbt_erase_shift); | |
1364 | ||
1365 | /* Mark bad block in memory */ | |
1366 | bbt_mark_entry(this, block, BBT_BLOCK_WORN); | |
1367 | ||
1368 | /* Update flash-based bad block table */ | |
1369 | if (this->bbt_options & NAND_BBT_USE_FLASH) | |
1370 | ret = nand_update_bbt(mtd, offs); | |
1371 | ||
1372 | return ret; | |
1373 | } | |
1374 | ||
e0c7d767 | 1375 | EXPORT_SYMBOL(nand_scan_bbt); |