aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/mtd/nand/nand_bbt.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/mtd/nand/nand_bbt.c')
-rw-r--r--drivers/mtd/nand/nand_bbt.c248
1 files changed, 124 insertions, 124 deletions
diff --git a/drivers/mtd/nand/nand_bbt.c b/drivers/mtd/nand/nand_bbt.c
index 7535ef53685e..ca286999fe08 100644
--- a/drivers/mtd/nand/nand_bbt.c
+++ b/drivers/mtd/nand/nand_bbt.c
@@ -3,10 +3,10 @@
3 * 3 *
4 * Overview: 4 * Overview:
5 * Bad block table support for the NAND driver 5 * Bad block table support for the NAND driver
6 * 6 *
7 * Copyright (C) 2004 Thomas Gleixner (tglx@linutronix.de) 7 * Copyright (C) 2004 Thomas Gleixner (tglx@linutronix.de)
8 * 8 *
9 * $Id: nand_bbt.c,v 1.35 2005/07/15 13:53:47 gleixner Exp $ 9 * $Id: nand_bbt.c,v 1.36 2005/11/07 11:14:30 gleixner Exp $
10 * 10 *
11 * This program is free software; you can redistribute it and/or modify 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 12 * it under the terms of the GNU General Public License version 2 as
@@ -14,23 +14,23 @@
14 * 14 *
15 * Description: 15 * Description:
16 * 16 *
17 * When nand_scan_bbt is called, then it tries to find the bad block table 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 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 19 * then the contents are read and the memory based bbt is created. If a
20 * mirrored bbt is selected then the mirror is searched too and the 20 * mirrored bbt is selected then the mirror is searched too and the
21 * versions are compared. If the mirror has a greater version number 21 * versions are compared. If the mirror has a greater version number
22 * than the mirror bbt is used to build the memory based bbt. 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. 23 * If the tables are not versioned, then we "or" the bad block information.
24 * If one of the bbt's is out of date or does not exist it is (re)created. 24 * If one of the bbt's is out of date or does not exist it is (re)created.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 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. 26 * good / bad blocks and the bad block tables are created.
27 * 27 *
28 * For manufacturer created bbts like the one found on M-SYS DOC devices 28 * For manufacturer created bbts like the one found on M-SYS DOC devices
29 * the bbt is searched and read but never created 29 * the bbt is searched and read but never created
30 * 30 *
31 * The autogenerated bad block table is located in the last good blocks 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. 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 33 * The table is marked in the oob area with an ident pattern and a version
34 * number which indicates which of both tables is more up to date. 34 * number which indicates which of both tables is more up to date.
35 * 35 *
36 * The table uses 2 bits per block 36 * The table uses 2 bits per block
@@ -43,13 +43,13 @@
43 * 01b: block is marked bad due to wear 43 * 01b: block is marked bad due to wear
44 * 10b: block is reserved (to protect the bbt area) 44 * 10b: block is reserved (to protect the bbt area)
45 * 11b: block is factory marked bad 45 * 11b: block is factory marked bad
46 * 46 *
47 * Multichip devices like DOC store the bad block info per floor. 47 * Multichip devices like DOC store the bad block info per floor.
48 * 48 *
49 * Following assumptions are made: 49 * Following assumptions are made:
50 * - bbts start at a page boundary, if autolocated on a block boundary 50 * - bbts start at a page boundary, if autolocated on a block boundary
51 * - the space neccecary for a bbt in FLASH does not exceed a block boundary 51 * - the space neccecary for a bbt in FLASH does not exceed a block boundary
52 * 52 *
53 */ 53 */
54 54
55#include <linux/slab.h> 55#include <linux/slab.h>
@@ -62,7 +62,7 @@
62#include <linux/delay.h> 62#include <linux/delay.h>
63 63
64 64
65/** 65/**
66 * check_pattern - [GENERIC] check if a pattern is in the buffer 66 * check_pattern - [GENERIC] check if a pattern is in the buffer
67 * @buf: the buffer to search 67 * @buf: the buffer to search
68 * @len: the length of buffer to search 68 * @len: the length of buffer to search
@@ -86,9 +86,9 @@ static int check_pattern (uint8_t *buf, int len, int paglen, struct nand_bbt_des
86 if (p[i] != 0xff) 86 if (p[i] != 0xff)
87 return -1; 87 return -1;
88 } 88 }
89 } 89 }
90 p += end; 90 p += end;
91 91
92 /* Compare the pattern */ 92 /* Compare the pattern */
93 for (i = 0; i < td->len; i++) { 93 for (i = 0; i < td->len; i++) {
94 if (p[i] != td->pattern[i]) 94 if (p[i] != td->pattern[i])
@@ -106,13 +106,13 @@ static int check_pattern (uint8_t *buf, int len, int paglen, struct nand_bbt_des
106 return 0; 106 return 0;
107} 107}
108 108
109/** 109/**
110 * check_short_pattern - [GENERIC] check if a pattern is in the buffer 110 * check_short_pattern - [GENERIC] check if a pattern is in the buffer
111 * @buf: the buffer to search 111 * @buf: the buffer to search
112 * @td: search pattern descriptor 112 * @td: search pattern descriptor
113 * 113 *
114 * Check for a pattern at the given place. Used to search bad block 114 * Check for a pattern at the given place. Used to search bad block
115 * tables and good / bad block identifiers. Same as check_pattern, but 115 * tables and good / bad block identifiers. Same as check_pattern, but
116 * no optional empty check 116 * no optional empty check
117 * 117 *
118*/ 118*/
@@ -142,7 +142,7 @@ static int check_short_pattern (uint8_t *buf, struct nand_bbt_descr *td)
142 * Read the bad block table starting from page. 142 * Read the bad block table starting from page.
143 * 143 *
144 */ 144 */
145static int read_bbt (struct mtd_info *mtd, uint8_t *buf, int page, int num, 145static int read_bbt (struct mtd_info *mtd, uint8_t *buf, int page, int num,
146 int bits, int offs, int reserved_block_code) 146 int bits, int offs, int reserved_block_code)
147{ 147{
148 int res, i, j, act = 0; 148 int res, i, j, act = 0;
@@ -153,7 +153,7 @@ static int read_bbt (struct mtd_info *mtd, uint8_t *buf, int page, int num,
153 153
154 totlen = (num * bits) >> 3; 154 totlen = (num * bits) >> 3;
155 from = ((loff_t)page) << this->page_shift; 155 from = ((loff_t)page) << this->page_shift;
156 156
157 while (totlen) { 157 while (totlen) {
158 len = min (totlen, (size_t) (1 << this->bbt_erase_shift)); 158 len = min (totlen, (size_t) (1 << this->bbt_erase_shift));
159 res = mtd->read_ecc (mtd, from, len, &retlen, buf, NULL, this->autooob); 159 res = mtd->read_ecc (mtd, from, len, &retlen, buf, NULL, this->autooob);
@@ -163,7 +163,7 @@ static int read_bbt (struct mtd_info *mtd, uint8_t *buf, int page, int num,
163 return res; 163 return res;
164 } 164 }
165 printk (KERN_WARNING "nand_bbt: ECC error while reading bad block table\n"); 165 printk (KERN_WARNING "nand_bbt: ECC error while reading bad block table\n");
166 } 166 }
167 167
168 /* Analyse data */ 168 /* Analyse data */
169 for (i = 0; i < len; i++) { 169 for (i = 0; i < len; i++) {
@@ -183,12 +183,12 @@ static int read_bbt (struct mtd_info *mtd, uint8_t *buf, int page, int num,
183 * message to MTD_DEBUG_LEVEL0 */ 183 * message to MTD_DEBUG_LEVEL0 */
184 printk (KERN_DEBUG "nand_read_bbt: Bad block at 0x%08x\n", 184 printk (KERN_DEBUG "nand_read_bbt: Bad block at 0x%08x\n",
185 ((offs << 2) + (act >> 1)) << this->bbt_erase_shift); 185 ((offs << 2) + (act >> 1)) << this->bbt_erase_shift);
186 /* Factory marked bad or worn out ? */ 186 /* Factory marked bad or worn out ? */
187 if (tmp == 0) 187 if (tmp == 0)
188 this->bbt[offs + (act >> 3)] |= 0x3 << (act & 0x06); 188 this->bbt[offs + (act >> 3)] |= 0x3 << (act & 0x06);
189 else 189 else
190 this->bbt[offs + (act >> 3)] |= 0x1 << (act & 0x06); 190 this->bbt[offs + (act >> 3)] |= 0x1 << (act & 0x06);
191 } 191 }
192 } 192 }
193 totlen -= len; 193 totlen -= len;
194 from += len; 194 from += len;
@@ -200,7 +200,7 @@ static int read_bbt (struct mtd_info *mtd, uint8_t *buf, int page, int num,
200 * read_abs_bbt - [GENERIC] Read the bad block table starting at a given page 200 * read_abs_bbt - [GENERIC] Read the bad block table starting at a given page
201 * @mtd: MTD device structure 201 * @mtd: MTD device structure
202 * @buf: temporary buffer 202 * @buf: temporary buffer
203 * @td: descriptor for the bad block table 203 * @td: descriptor for the bad block table
204 * @chip: read the table for a specific chip, -1 read all chips. 204 * @chip: read the table for a specific chip, -1 read all chips.
205 * Applies only if NAND_BBT_PERCHIP option is set 205 * Applies only if NAND_BBT_PERCHIP option is set
206 * 206 *
@@ -235,7 +235,7 @@ static int read_abs_bbt (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_des
235 * read_abs_bbts - [GENERIC] Read the bad block table(s) for all chips starting at a given page 235 * read_abs_bbts - [GENERIC] Read the bad block table(s) for all chips starting at a given page
236 * @mtd: MTD device structure 236 * @mtd: MTD device structure
237 * @buf: temporary buffer 237 * @buf: temporary buffer
238 * @td: descriptor for the bad block table 238 * @td: descriptor for the bad block table
239 * @md: descriptor for the bad block table mirror 239 * @md: descriptor for the bad block table mirror
240 * 240 *
241 * Read the bad block table(s) for all chips starting at a given page 241 * Read the bad block table(s) for all chips starting at a given page
@@ -247,16 +247,16 @@ static int read_abs_bbts (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_de
247{ 247{
248 struct nand_chip *this = mtd->priv; 248 struct nand_chip *this = mtd->priv;
249 249
250 /* Read the primary version, if available */ 250 /* Read the primary version, if available */
251 if (td->options & NAND_BBT_VERSION) { 251 if (td->options & NAND_BBT_VERSION) {
252 nand_read_raw (mtd, buf, td->pages[0] << this->page_shift, mtd->oobblock, mtd->oobsize); 252 nand_read_raw (mtd, buf, td->pages[0] << this->page_shift, mtd->oobblock, mtd->oobsize);
253 td->version[0] = buf[mtd->oobblock + td->veroffs]; 253 td->version[0] = buf[mtd->oobblock + td->veroffs];
254 printk (KERN_DEBUG "Bad block table at page %d, version 0x%02X\n", td->pages[0], td->version[0]); 254 printk (KERN_DEBUG "Bad block table at page %d, version 0x%02X\n", td->pages[0], td->version[0]);
255 } 255 }
256 256
257 /* Read the mirror version, if available */ 257 /* Read the mirror version, if available */
258 if (md && (md->options & NAND_BBT_VERSION)) { 258 if (md && (md->options & NAND_BBT_VERSION)) {
259 nand_read_raw (mtd, buf, md->pages[0] << this->page_shift, mtd->oobblock, mtd->oobsize); 259 nand_read_raw (mtd, buf, md->pages[0] << this->page_shift, mtd->oobblock, mtd->oobsize);
260 md->version[0] = buf[mtd->oobblock + md->veroffs]; 260 md->version[0] = buf[mtd->oobblock + md->veroffs];
261 printk (KERN_DEBUG "Bad block table at page %d, version 0x%02X\n", md->pages[0], md->version[0]); 261 printk (KERN_DEBUG "Bad block table at page %d, version 0x%02X\n", md->pages[0], md->version[0]);
262 } 262 }
@@ -290,7 +290,7 @@ static int create_bbt (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr
290 else { 290 else {
291 if (bd->options & NAND_BBT_SCAN2NDPAGE) 291 if (bd->options & NAND_BBT_SCAN2NDPAGE)
292 len = 2; 292 len = 2;
293 else 293 else
294 len = 1; 294 len = 1;
295 } 295 }
296 296
@@ -322,10 +322,10 @@ static int create_bbt (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr
322 numblocks += startblock; 322 numblocks += startblock;
323 from = startblock << (this->bbt_erase_shift - 1); 323 from = startblock << (this->bbt_erase_shift - 1);
324 } 324 }
325 325
326 for (i = startblock; i < numblocks;) { 326 for (i = startblock; i < numblocks;) {
327 int ret; 327 int ret;
328 328
329 if (bd->options & NAND_BBT_SCANEMPTY) 329 if (bd->options & NAND_BBT_SCANEMPTY)
330 if ((ret = nand_read_raw (mtd, buf, from, readlen, ooblen))) 330 if ((ret = nand_read_raw (mtd, buf, from, readlen, ooblen)))
331 return ret; 331 return ret;
@@ -333,8 +333,8 @@ static int create_bbt (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr
333 for (j = 0; j < len; j++) { 333 for (j = 0; j < len; j++) {
334 if (!(bd->options & NAND_BBT_SCANEMPTY)) { 334 if (!(bd->options & NAND_BBT_SCANEMPTY)) {
335 size_t retlen; 335 size_t retlen;
336 336
337 /* Read the full oob until read_oob is fixed to 337 /* Read the full oob until read_oob is fixed to
338 * handle single byte reads for 16 bit buswidth */ 338 * handle single byte reads for 16 bit buswidth */
339 ret = mtd->read_oob(mtd, from + j * mtd->oobblock, 339 ret = mtd->read_oob(mtd, from + j * mtd->oobblock,
340 mtd->oobsize, &retlen, buf); 340 mtd->oobsize, &retlen, buf);
@@ -343,14 +343,14 @@ static int create_bbt (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr
343 343
344 if (check_short_pattern (buf, bd)) { 344 if (check_short_pattern (buf, bd)) {
345 this->bbt[i >> 3] |= 0x03 << (i & 0x6); 345 this->bbt[i >> 3] |= 0x03 << (i & 0x6);
346 printk (KERN_WARNING "Bad eraseblock %d at 0x%08x\n", 346 printk (KERN_WARNING "Bad eraseblock %d at 0x%08x\n",
347 i >> 1, (unsigned int) from); 347 i >> 1, (unsigned int) from);
348 break; 348 break;
349 } 349 }
350 } else { 350 } else {
351 if (check_pattern (&buf[j * scanlen], scanlen, mtd->oobblock, bd)) { 351 if (check_pattern (&buf[j * scanlen], scanlen, mtd->oobblock, bd)) {
352 this->bbt[i >> 3] |= 0x03 << (i & 0x6); 352 this->bbt[i >> 3] |= 0x03 << (i & 0x6);
353 printk (KERN_WARNING "Bad eraseblock %d at 0x%08x\n", 353 printk (KERN_WARNING "Bad eraseblock %d at 0x%08x\n",
354 i >> 1, (unsigned int) from); 354 i >> 1, (unsigned int) from);
355 break; 355 break;
356 } 356 }
@@ -369,15 +369,15 @@ static int create_bbt (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr
369 * @td: descriptor for the bad block table 369 * @td: descriptor for the bad block table
370 * 370 *
371 * Read the bad block table by searching for a given ident pattern. 371 * Read the bad block table by searching for a given ident pattern.
372 * Search is preformed either from the beginning up or from the end of 372 * Search is preformed either from the beginning up or from the end of
373 * the device downwards. The search starts always at the start of a 373 * the device downwards. The search starts always at the start of a
374 * block. 374 * block.
375 * If the option NAND_BBT_PERCHIP is given, each chip is searched 375 * If the option NAND_BBT_PERCHIP is given, each chip is searched
376 * for a bbt, which contains the bad block information of this chip. 376 * for a bbt, which contains the bad block information of this chip.
377 * This is neccecary to provide support for certain DOC devices. 377 * This is neccecary to provide support for certain DOC devices.
378 * 378 *
379 * The bbt ident pattern resides in the oob area of the first page 379 * The bbt ident pattern resides in the oob area of the first page
380 * in a block. 380 * in a block.
381 */ 381 */
382static int search_bbt (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td) 382static int search_bbt (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td)
383{ 383{
@@ -392,10 +392,10 @@ static int search_bbt (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr
392 startblock = (mtd->size >> this->bbt_erase_shift) -1; 392 startblock = (mtd->size >> this->bbt_erase_shift) -1;
393 dir = -1; 393 dir = -1;
394 } else { 394 } else {
395 startblock = 0; 395 startblock = 0;
396 dir = 1; 396 dir = 1;
397 } 397 }
398 398
399 /* Do we have a bbt per chip ? */ 399 /* Do we have a bbt per chip ? */
400 if (td->options & NAND_BBT_PERCHIP) { 400 if (td->options & NAND_BBT_PERCHIP) {
401 chips = this->numchips; 401 chips = this->numchips;
@@ -405,19 +405,19 @@ static int search_bbt (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr
405 chips = 1; 405 chips = 1;
406 bbtblocks = mtd->size >> this->bbt_erase_shift; 406 bbtblocks = mtd->size >> this->bbt_erase_shift;
407 } 407 }
408 408
409 /* Number of bits for each erase block in the bbt */ 409 /* Number of bits for each erase block in the bbt */
410 bits = td->options & NAND_BBT_NRBITS_MSK; 410 bits = td->options & NAND_BBT_NRBITS_MSK;
411 411
412 for (i = 0; i < chips; i++) { 412 for (i = 0; i < chips; i++) {
413 /* Reset version information */ 413 /* Reset version information */
414 td->version[i] = 0; 414 td->version[i] = 0;
415 td->pages[i] = -1; 415 td->pages[i] = -1;
416 /* Scan the maximum number of blocks */ 416 /* Scan the maximum number of blocks */
417 for (block = 0; block < td->maxblocks; block++) { 417 for (block = 0; block < td->maxblocks; block++) {
418 int actblock = startblock + dir * block; 418 int actblock = startblock + dir * block;
419 /* Read first page */ 419 /* Read first page */
420 nand_read_raw (mtd, buf, actblock << this->bbt_erase_shift, mtd->oobblock, mtd->oobsize); 420 nand_read_raw (mtd, buf, actblock << this->bbt_erase_shift, mtd->oobblock, mtd->oobsize);
421 if (!check_pattern(buf, scanlen, mtd->oobblock, td)) { 421 if (!check_pattern(buf, scanlen, mtd->oobblock, td)) {
422 td->pages[i] = actblock << (this->bbt_erase_shift - this->page_shift); 422 td->pages[i] = actblock << (this->bbt_erase_shift - this->page_shift);
423 if (td->options & NAND_BBT_VERSION) { 423 if (td->options & NAND_BBT_VERSION) {
@@ -435,46 +435,46 @@ static int search_bbt (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr
435 else 435 else
436 printk (KERN_DEBUG "Bad block table found at page %d, version 0x%02X\n", td->pages[i], td->version[i]); 436 printk (KERN_DEBUG "Bad block table found at page %d, version 0x%02X\n", td->pages[i], td->version[i]);
437 } 437 }
438 return 0; 438 return 0;
439} 439}
440 440
441/** 441/**
442 * search_read_bbts - [GENERIC] scan the device for bad block table(s) 442 * search_read_bbts - [GENERIC] scan the device for bad block table(s)
443 * @mtd: MTD device structure 443 * @mtd: MTD device structure
444 * @buf: temporary buffer 444 * @buf: temporary buffer
445 * @td: descriptor for the bad block table 445 * @td: descriptor for the bad block table
446 * @md: descriptor for the bad block table mirror 446 * @md: descriptor for the bad block table mirror
447 * 447 *
448 * Search and read the bad block table(s) 448 * Search and read the bad block table(s)
449*/ 449*/
450static int search_read_bbts (struct mtd_info *mtd, uint8_t *buf, 450static int search_read_bbts (struct mtd_info *mtd, uint8_t *buf,
451 struct nand_bbt_descr *td, struct nand_bbt_descr *md) 451 struct nand_bbt_descr *td, struct nand_bbt_descr *md)
452{ 452{
453 /* Search the primary table */ 453 /* Search the primary table */
454 search_bbt (mtd, buf, td); 454 search_bbt (mtd, buf, td);
455 455
456 /* Search the mirror table */ 456 /* Search the mirror table */
457 if (md) 457 if (md)
458 search_bbt (mtd, buf, md); 458 search_bbt (mtd, buf, md);
459 459
460 /* Force result check */ 460 /* Force result check */
461 return 1; 461 return 1;
462} 462}
463
464 463
465/** 464
465/**
466 * write_bbt - [GENERIC] (Re)write the bad block table 466 * write_bbt - [GENERIC] (Re)write the bad block table
467 * 467 *
468 * @mtd: MTD device structure 468 * @mtd: MTD device structure
469 * @buf: temporary buffer 469 * @buf: temporary buffer
470 * @td: descriptor for the bad block table 470 * @td: descriptor for the bad block table
471 * @md: descriptor for the bad block table mirror 471 * @md: descriptor for the bad block table mirror
472 * @chipsel: selector for a specific chip, -1 for all 472 * @chipsel: selector for a specific chip, -1 for all
473 * 473 *
474 * (Re)write the bad block table 474 * (Re)write the bad block table
475 * 475 *
476*/ 476*/
477static int write_bbt (struct mtd_info *mtd, uint8_t *buf, 477static int write_bbt (struct mtd_info *mtd, uint8_t *buf,
478 struct nand_bbt_descr *td, struct nand_bbt_descr *md, int chipsel) 478 struct nand_bbt_descr *td, struct nand_bbt_descr *md, int chipsel)
479{ 479{
480 struct nand_chip *this = mtd->priv; 480 struct nand_chip *this = mtd->priv;
@@ -493,7 +493,7 @@ static int write_bbt (struct mtd_info *mtd, uint8_t *buf,
493 /* Write bad block table per chip rather than per device ? */ 493 /* Write bad block table per chip rather than per device ? */
494 if (td->options & NAND_BBT_PERCHIP) { 494 if (td->options & NAND_BBT_PERCHIP) {
495 numblocks = (int) (this->chipsize >> this->bbt_erase_shift); 495 numblocks = (int) (this->chipsize >> this->bbt_erase_shift);
496 /* Full device write or specific chip ? */ 496 /* Full device write or specific chip ? */
497 if (chipsel == -1) { 497 if (chipsel == -1) {
498 nrchips = this->numchips; 498 nrchips = this->numchips;
499 } else { 499 } else {
@@ -503,19 +503,19 @@ static int write_bbt (struct mtd_info *mtd, uint8_t *buf,
503 } else { 503 } else {
504 numblocks = (int) (mtd->size >> this->bbt_erase_shift); 504 numblocks = (int) (mtd->size >> this->bbt_erase_shift);
505 nrchips = 1; 505 nrchips = 1;
506 } 506 }
507 507
508 /* Loop through the chips */ 508 /* Loop through the chips */
509 for (; chip < nrchips; chip++) { 509 for (; chip < nrchips; chip++) {
510 510
511 /* There was already a version of the table, reuse the page 511 /* There was already a version of the table, reuse the page
512 * This applies for absolute placement too, as we have the 512 * This applies for absolute placement too, as we have the
513 * page nr. in td->pages. 513 * page nr. in td->pages.
514 */ 514 */
515 if (td->pages[chip] != -1) { 515 if (td->pages[chip] != -1) {
516 page = td->pages[chip]; 516 page = td->pages[chip];
517 goto write; 517 goto write;
518 } 518 }
519 519
520 /* Automatic placement of the bad block table */ 520 /* Automatic placement of the bad block table */
521 /* Search direction top -> down ? */ 521 /* Search direction top -> down ? */
@@ -525,7 +525,7 @@ static int write_bbt (struct mtd_info *mtd, uint8_t *buf,
525 } else { 525 } else {
526 startblock = chip * numblocks; 526 startblock = chip * numblocks;
527 dir = 1; 527 dir = 1;
528 } 528 }
529 529
530 for (i = 0; i < td->maxblocks; i++) { 530 for (i = 0; i < td->maxblocks; i++) {
531 int block = startblock + dir * i; 531 int block = startblock + dir * i;
@@ -542,7 +542,7 @@ static int write_bbt (struct mtd_info *mtd, uint8_t *buf,
542 } 542 }
543 printk (KERN_ERR "No space left to write bad block table\n"); 543 printk (KERN_ERR "No space left to write bad block table\n");
544 return -ENOSPC; 544 return -ENOSPC;
545write: 545write:
546 546
547 /* Set up shift count and masks for the flash table */ 547 /* Set up shift count and masks for the flash table */
548 bits = td->options & NAND_BBT_NRBITS_MSK; 548 bits = td->options & NAND_BBT_NRBITS_MSK;
@@ -553,14 +553,14 @@ write:
553 case 8: sft = 0; sftmsk = 0x00; msk[0] = 0x00; msk[1] = 0x0F; msk[2] = ~rcode; msk[3] = 0xff; break; 553 case 8: sft = 0; sftmsk = 0x00; msk[0] = 0x00; msk[1] = 0x0F; msk[2] = ~rcode; msk[3] = 0xff; break;
554 default: return -EINVAL; 554 default: return -EINVAL;
555 } 555 }
556 556
557 bbtoffs = chip * (numblocks >> 2); 557 bbtoffs = chip * (numblocks >> 2);
558 558
559 to = ((loff_t) page) << this->page_shift; 559 to = ((loff_t) page) << this->page_shift;
560 560
561 memcpy (&oobinfo, this->autooob, sizeof(oobinfo)); 561 memcpy (&oobinfo, this->autooob, sizeof(oobinfo));
562 oobinfo.useecc = MTD_NANDECC_PLACEONLY; 562 oobinfo.useecc = MTD_NANDECC_PLACEONLY;
563 563
564 /* Must we save the block contents ? */ 564 /* Must we save the block contents ? */
565 if (td->options & NAND_BBT_SAVECONTENT) { 565 if (td->options & NAND_BBT_SAVECONTENT) {
566 /* Make it block aligned */ 566 /* Make it block aligned */
@@ -599,7 +599,7 @@ write:
599 buf[len + td->veroffs] = td->version[chip]; 599 buf[len + td->veroffs] = td->version[chip];
600 } 600 }
601 } 601 }
602 602
603 /* walk through the memory table */ 603 /* walk through the memory table */
604 for (i = 0; i < numblocks; ) { 604 for (i = 0; i < numblocks; ) {
605 uint8_t dat; 605 uint8_t dat;
@@ -611,7 +611,7 @@ write:
611 dat >>= 2; 611 dat >>= 2;
612 } 612 }
613 } 613 }
614 614
615 memset (&einfo, 0, sizeof (einfo)); 615 memset (&einfo, 0, sizeof (einfo));
616 einfo.mtd = mtd; 616 einfo.mtd = mtd;
617 einfo.addr = (unsigned long) to; 617 einfo.addr = (unsigned long) to;
@@ -621,18 +621,18 @@ write:
621 printk (KERN_WARNING "nand_bbt: Error during block erase: %d\n", res); 621 printk (KERN_WARNING "nand_bbt: Error during block erase: %d\n", res);
622 return res; 622 return res;
623 } 623 }
624 624
625 res = mtd->write_ecc (mtd, to, len, &retlen, buf, &buf[len], &oobinfo); 625 res = mtd->write_ecc (mtd, to, len, &retlen, buf, &buf[len], &oobinfo);
626 if (res < 0) { 626 if (res < 0) {
627 printk (KERN_WARNING "nand_bbt: Error while writing bad block table %d\n", res); 627 printk (KERN_WARNING "nand_bbt: Error while writing bad block table %d\n", res);
628 return res; 628 return res;
629 } 629 }
630 printk (KERN_DEBUG "Bad block table written to 0x%08x, version 0x%02X\n", 630 printk (KERN_DEBUG "Bad block table written to 0x%08x, version 0x%02X\n",
631 (unsigned int) to, td->version[chip]); 631 (unsigned int) to, td->version[chip]);
632 632
633 /* Mark it as used */ 633 /* Mark it as used */
634 td->pages[chip] = page; 634 td->pages[chip] = page;
635 } 635 }
636 return 0; 636 return 0;
637} 637}
638 638
@@ -641,7 +641,7 @@ write:
641 * @mtd: MTD device structure 641 * @mtd: MTD device structure
642 * @bd: descriptor for the good/bad block search pattern 642 * @bd: descriptor for the good/bad block search pattern
643 * 643 *
644 * The function creates a memory based bbt by scanning the device 644 * The function creates a memory based bbt by scanning the device
645 * for manufacturer / software marked good / bad blocks 645 * for manufacturer / software marked good / bad blocks
646*/ 646*/
647static inline int nand_memory_bbt (struct mtd_info *mtd, struct nand_bbt_descr *bd) 647static inline int nand_memory_bbt (struct mtd_info *mtd, struct nand_bbt_descr *bd)
@@ -673,11 +673,11 @@ static int check_create (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_des
673 struct nand_bbt_descr *rd, *rd2; 673 struct nand_bbt_descr *rd, *rd2;
674 674
675 /* Do we have a bbt per chip ? */ 675 /* Do we have a bbt per chip ? */
676 if (td->options & NAND_BBT_PERCHIP) 676 if (td->options & NAND_BBT_PERCHIP)
677 chips = this->numchips; 677 chips = this->numchips;
678 else 678 else
679 chips = 1; 679 chips = 1;
680 680
681 for (i = 0; i < chips; i++) { 681 for (i = 0; i < chips; i++) {
682 writeops = 0; 682 writeops = 0;
683 rd = NULL; 683 rd = NULL;
@@ -692,7 +692,7 @@ static int check_create (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_des
692 } 692 }
693 693
694 if (td->pages[i] == -1) { 694 if (td->pages[i] == -1) {
695 rd = md; 695 rd = md;
696 td->version[i] = md->version[i]; 696 td->version[i] = md->version[i];
697 writeops = 1; 697 writeops = 1;
698 goto writecheck; 698 goto writecheck;
@@ -710,7 +710,7 @@ static int check_create (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_des
710 if (!(td->options & NAND_BBT_VERSION)) 710 if (!(td->options & NAND_BBT_VERSION))
711 rd2 = md; 711 rd2 = md;
712 goto writecheck; 712 goto writecheck;
713 } 713 }
714 714
715 if (((int8_t) (td->version[i] - md->version[i])) > 0) { 715 if (((int8_t) (td->version[i] - md->version[i])) > 0) {
716 rd = td; 716 rd = td;
@@ -735,15 +735,15 @@ static int check_create (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_des
735create: 735create:
736 /* Create the bad block table by scanning the device ? */ 736 /* Create the bad block table by scanning the device ? */
737 if (!(td->options & NAND_BBT_CREATE)) 737 if (!(td->options & NAND_BBT_CREATE))
738 continue; 738 continue;
739 739
740 /* Create the table in memory by scanning the chip(s) */ 740 /* Create the table in memory by scanning the chip(s) */
741 create_bbt (mtd, buf, bd, chipsel); 741 create_bbt (mtd, buf, bd, chipsel);
742 742
743 td->version[i] = 1; 743 td->version[i] = 1;
744 if (md) 744 if (md)
745 md->version[i] = 1; 745 md->version[i] = 1;
746writecheck: 746writecheck:
747 /* read back first ? */ 747 /* read back first ? */
748 if (rd) 748 if (rd)
749 read_abs_bbt (mtd, buf, rd, chipsel); 749 read_abs_bbt (mtd, buf, rd, chipsel);
@@ -757,7 +757,7 @@ writecheck:
757 if (res < 0) 757 if (res < 0)
758 return res; 758 return res;
759 } 759 }
760 760
761 /* Write the mirror bad block table to the device ? */ 761 /* Write the mirror bad block table to the device ? */
762 if ((writeops & 0x02) && md && (md->options & NAND_BBT_WRITE)) { 762 if ((writeops & 0x02) && md && (md->options & NAND_BBT_WRITE)) {
763 res = write_bbt (mtd, buf, md, td, chipsel); 763 res = write_bbt (mtd, buf, md, td, chipsel);
@@ -765,11 +765,11 @@ writecheck:
765 return res; 765 return res;
766 } 766 }
767 } 767 }
768 return 0; 768 return 0;
769} 769}
770 770
771/** 771/**
772 * mark_bbt_regions - [GENERIC] mark the bad block table regions 772 * mark_bbt_regions - [GENERIC] mark the bad block table regions
773 * @mtd: MTD device structure 773 * @mtd: MTD device structure
774 * @td: bad block table descriptor 774 * @td: bad block table descriptor
775 * 775 *
@@ -790,14 +790,14 @@ static void mark_bbt_region (struct mtd_info *mtd, struct nand_bbt_descr *td)
790 } else { 790 } else {
791 chips = 1; 791 chips = 1;
792 nrblocks = (int)(mtd->size >> this->bbt_erase_shift); 792 nrblocks = (int)(mtd->size >> this->bbt_erase_shift);
793 } 793 }
794 794
795 for (i = 0; i < chips; i++) { 795 for (i = 0; i < chips; i++) {
796 if ((td->options & NAND_BBT_ABSPAGE) || 796 if ((td->options & NAND_BBT_ABSPAGE) ||
797 !(td->options & NAND_BBT_WRITE)) { 797 !(td->options & NAND_BBT_WRITE)) {
798 if (td->pages[i] == -1) continue; 798 if (td->pages[i] == -1) continue;
799 block = td->pages[i] >> (this->bbt_erase_shift - this->page_shift); 799 block = td->pages[i] >> (this->bbt_erase_shift - this->page_shift);
800 block <<= 1; 800 block <<= 1;
801 oldval = this->bbt[(block >> 3)]; 801 oldval = this->bbt[(block >> 3)];
802 newval = oldval | (0x2 << (block & 0x06)); 802 newval = oldval | (0x2 << (block & 0x06));
803 this->bbt[(block >> 3)] = newval; 803 this->bbt[(block >> 3)] = newval;
@@ -808,16 +808,16 @@ static void mark_bbt_region (struct mtd_info *mtd, struct nand_bbt_descr *td)
808 update = 0; 808 update = 0;
809 if (td->options & NAND_BBT_LASTBLOCK) 809 if (td->options & NAND_BBT_LASTBLOCK)
810 block = ((i + 1) * nrblocks) - td->maxblocks; 810 block = ((i + 1) * nrblocks) - td->maxblocks;
811 else 811 else
812 block = i * nrblocks; 812 block = i * nrblocks;
813 block <<= 1; 813 block <<= 1;
814 for (j = 0; j < td->maxblocks; j++) { 814 for (j = 0; j < td->maxblocks; j++) {
815 oldval = this->bbt[(block >> 3)]; 815 oldval = this->bbt[(block >> 3)];
816 newval = oldval | (0x2 << (block & 0x06)); 816 newval = oldval | (0x2 << (block & 0x06));
817 this->bbt[(block >> 3)] = newval; 817 this->bbt[(block >> 3)] = newval;
818 if (oldval != newval) update = 1; 818 if (oldval != newval) update = 1;
819 block += 2; 819 block += 2;
820 } 820 }
821 /* If we want reserved blocks to be recorded to flash, and some 821 /* If we want reserved blocks to be recorded to flash, and some
822 new ones have been marked, then we need to update the stored 822 new ones have been marked, then we need to update the stored
823 bbts. This should only happen once. */ 823 bbts. This should only happen once. */
@@ -831,7 +831,7 @@ static void mark_bbt_region (struct mtd_info *mtd, struct nand_bbt_descr *td)
831 * @mtd: MTD device structure 831 * @mtd: MTD device structure
832 * @bd: descriptor for the good/bad block search pattern 832 * @bd: descriptor for the good/bad block search pattern
833 * 833 *
834 * The function checks, if a bad block table(s) is/are already 834 * The function checks, if a bad block table(s) is/are already
835 * available. If not it scans the device for manufacturer 835 * available. If not it scans the device for manufacturer
836 * marked good / bad blocks and writes the bad block table(s) to 836 * marked good / bad blocks and writes the bad block table(s) to
837 * the selected place. 837 * the selected place.
@@ -880,30 +880,30 @@ int nand_scan_bbt (struct mtd_info *mtd, struct nand_bbt_descr *bd)
880 this->bbt = NULL; 880 this->bbt = NULL;
881 return -ENOMEM; 881 return -ENOMEM;
882 } 882 }
883 883
884 /* Is the bbt at a given page ? */ 884 /* Is the bbt at a given page ? */
885 if (td->options & NAND_BBT_ABSPAGE) { 885 if (td->options & NAND_BBT_ABSPAGE) {
886 res = read_abs_bbts (mtd, buf, td, md); 886 res = read_abs_bbts (mtd, buf, td, md);
887 } else { 887 } else {
888 /* Search the bad block table using a pattern in oob */ 888 /* Search the bad block table using a pattern in oob */
889 res = search_read_bbts (mtd, buf, td, md); 889 res = search_read_bbts (mtd, buf, td, md);
890 } 890 }
891 891
892 if (res) 892 if (res)
893 res = check_create (mtd, buf, bd); 893 res = check_create (mtd, buf, bd);
894 894
895 /* Prevent the bbt regions from erasing / writing */ 895 /* Prevent the bbt regions from erasing / writing */
896 mark_bbt_region (mtd, td); 896 mark_bbt_region (mtd, td);
897 if (md) 897 if (md)
898 mark_bbt_region (mtd, md); 898 mark_bbt_region (mtd, md);
899 899
900 kfree (buf); 900 kfree (buf);
901 return res; 901 return res;
902} 902}
903 903
904 904
905/** 905/**
906 * nand_update_bbt - [NAND Interface] update bad block table(s) 906 * nand_update_bbt - [NAND Interface] update bad block table(s)
907 * @mtd: MTD device structure 907 * @mtd: MTD device structure
908 * @offs: the offset of the newly marked block 908 * @offs: the offset of the newly marked block
909 * 909 *
@@ -930,7 +930,7 @@ int nand_update_bbt (struct mtd_info *mtd, loff_t offs)
930 printk (KERN_ERR "nand_update_bbt: Out of memory\n"); 930 printk (KERN_ERR "nand_update_bbt: Out of memory\n");
931 return -ENOMEM; 931 return -ENOMEM;
932 } 932 }
933 933
934 writeops = md != NULL ? 0x03 : 0x01; 934 writeops = md != NULL ? 0x03 : 0x01;
935 935
936 /* Do we have a bbt per chip ? */ 936 /* Do we have a bbt per chip ? */
@@ -944,7 +944,7 @@ int nand_update_bbt (struct mtd_info *mtd, loff_t offs)
944 944
945 td->version[chip]++; 945 td->version[chip]++;
946 if (md) 946 if (md)
947 md->version[chip]++; 947 md->version[chip]++;
948 948
949 /* Write the bad block table to the device ? */ 949 /* Write the bad block table to the device ? */
950 if ((writeops & 0x01) && (td->options & NAND_BBT_WRITE)) { 950 if ((writeops & 0x01) && (td->options & NAND_BBT_WRITE)) {
@@ -957,12 +957,12 @@ int nand_update_bbt (struct mtd_info *mtd, loff_t offs)
957 res = write_bbt (mtd, buf, md, td, chipsel); 957 res = write_bbt (mtd, buf, md, td, chipsel);
958 } 958 }
959 959
960out: 960out:
961 kfree (buf); 961 kfree (buf);
962 return res; 962 return res;
963} 963}
964 964
965/* Define some generic bad / good block scan pattern which are used 965/* Define some generic bad / good block scan pattern which are used
966 * while scanning a device for factory marked good / bad blocks. */ 966 * while scanning a device for factory marked good / bad blocks. */
967static uint8_t scan_ff_pattern[] = { 0xff, 0xff }; 967static uint8_t scan_ff_pattern[] = { 0xff, 0xff };
968 968
@@ -1009,7 +1009,7 @@ static uint8_t bbt_pattern[] = {'B', 'b', 't', '0' };
1009static uint8_t mirror_pattern[] = {'1', 't', 'b', 'B' }; 1009static uint8_t mirror_pattern[] = {'1', 't', 'b', 'B' };
1010 1010
1011static struct nand_bbt_descr bbt_main_descr = { 1011static struct nand_bbt_descr bbt_main_descr = {
1012 .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE 1012 .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
1013 | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP, 1013 | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP,
1014 .offs = 8, 1014 .offs = 8,
1015 .len = 4, 1015 .len = 4,
@@ -1019,7 +1019,7 @@ static struct nand_bbt_descr bbt_main_descr = {
1019}; 1019};
1020 1020
1021static struct nand_bbt_descr bbt_mirror_descr = { 1021static struct nand_bbt_descr bbt_mirror_descr = {
1022 .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE 1022 .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
1023 | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP, 1023 | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP,
1024 .offs = 8, 1024 .offs = 8,
1025 .len = 4, 1025 .len = 4,
@@ -1029,7 +1029,7 @@ static struct nand_bbt_descr bbt_mirror_descr = {
1029}; 1029};
1030 1030
1031/** 1031/**
1032 * nand_default_bbt - [NAND Interface] Select a default bad block table for the device 1032 * nand_default_bbt - [NAND Interface] Select a default bad block table for the device
1033 * @mtd: MTD device structure 1033 * @mtd: MTD device structure
1034 * 1034 *
1035 * This function selects the default bad block table 1035 * This function selects the default bad block table
@@ -1039,29 +1039,29 @@ static struct nand_bbt_descr bbt_mirror_descr = {
1039int nand_default_bbt (struct mtd_info *mtd) 1039int nand_default_bbt (struct mtd_info *mtd)
1040{ 1040{
1041 struct nand_chip *this = mtd->priv; 1041 struct nand_chip *this = mtd->priv;
1042 1042
1043 /* Default for AG-AND. We must use a flash based 1043 /* Default for AG-AND. We must use a flash based
1044 * bad block table as the devices have factory marked 1044 * bad block table as the devices have factory marked
1045 * _good_ blocks. Erasing those blocks leads to loss 1045 * _good_ blocks. Erasing those blocks leads to loss
1046 * of the good / bad information, so we _must_ store 1046 * of the good / bad information, so we _must_ store
1047 * this information in a good / bad table during 1047 * this information in a good / bad table during
1048 * startup 1048 * startup
1049 */ 1049 */
1050 if (this->options & NAND_IS_AND) { 1050 if (this->options & NAND_IS_AND) {
1051 /* Use the default pattern descriptors */ 1051 /* Use the default pattern descriptors */
1052 if (!this->bbt_td) { 1052 if (!this->bbt_td) {
1053 this->bbt_td = &bbt_main_descr; 1053 this->bbt_td = &bbt_main_descr;
1054 this->bbt_md = &bbt_mirror_descr; 1054 this->bbt_md = &bbt_mirror_descr;
1055 } 1055 }
1056 this->options |= NAND_USE_FLASH_BBT; 1056 this->options |= NAND_USE_FLASH_BBT;
1057 return nand_scan_bbt (mtd, &agand_flashbased); 1057 return nand_scan_bbt (mtd, &agand_flashbased);
1058 } 1058 }
1059 1059
1060 1060
1061 /* Is a flash based bad block table requested ? */ 1061 /* Is a flash based bad block table requested ? */
1062 if (this->options & NAND_USE_FLASH_BBT) { 1062 if (this->options & NAND_USE_FLASH_BBT) {
1063 /* Use the default pattern descriptors */ 1063 /* Use the default pattern descriptors */
1064 if (!this->bbt_td) { 1064 if (!this->bbt_td) {
1065 this->bbt_td = &bbt_main_descr; 1065 this->bbt_td = &bbt_main_descr;
1066 this->bbt_md = &bbt_mirror_descr; 1066 this->bbt_md = &bbt_mirror_descr;
1067 } 1067 }
@@ -1081,7 +1081,7 @@ int nand_default_bbt (struct mtd_info *mtd)
1081} 1081}
1082 1082
1083/** 1083/**
1084 * nand_isbad_bbt - [NAND Interface] Check if a block is bad 1084 * nand_isbad_bbt - [NAND Interface] Check if a block is bad
1085 * @mtd: MTD device structure 1085 * @mtd: MTD device structure
1086 * @offs: offset in the device 1086 * @offs: offset in the device
1087 * @allowbbt: allow access to bad block table region 1087 * @allowbbt: allow access to bad block table region
@@ -1092,12 +1092,12 @@ int nand_isbad_bbt (struct mtd_info *mtd, loff_t offs, int allowbbt)
1092 struct nand_chip *this = mtd->priv; 1092 struct nand_chip *this = mtd->priv;
1093 int block; 1093 int block;
1094 uint8_t res; 1094 uint8_t res;
1095 1095
1096 /* Get block number * 2 */ 1096 /* Get block number * 2 */
1097 block = (int) (offs >> (this->bbt_erase_shift - 1)); 1097 block = (int) (offs >> (this->bbt_erase_shift - 1));
1098 res = (this->bbt[block >> 3] >> (block & 0x06)) & 0x03; 1098 res = (this->bbt[block >> 3] >> (block & 0x06)) & 0x03;
1099 1099
1100 DEBUG (MTD_DEBUG_LEVEL2, "nand_isbad_bbt(): bbt info for offs 0x%08x: (block %d) 0x%02x\n", 1100 DEBUG (MTD_DEBUG_LEVEL2, "nand_isbad_bbt(): bbt info for offs 0x%08x: (block %d) 0x%02x\n",
1101 (unsigned int)offs, block >> 1, res); 1101 (unsigned int)offs, block >> 1, res);
1102 1102
1103 switch ((int)res) { 1103 switch ((int)res) {