1/* 2 * Broadcom NAND flash BBT interface 3 * 4 * Copyright (C) 2013, Broadcom Corporation. All Rights Reserved. 5 * 6 * Permission to use, copy, modify, and/or distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY 13 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION 15 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN 16 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 * 18 * $Id $ 19 */ 20/* 21 * When brcmnand_scan_bbt is called, then it tries to find the bad block table 22 * depending on the options in the bbt descriptor(s). If a bbt is found 23 * then the contents are read and the memory based bbt is created. If a 24 * mirrored bbt is selected then the mirror is searched too and the 25 * versions are compared. If the mirror has a greater version number 26 * than the mirror bbt is used to build the memory based bbt. 27 * If the tables are not versioned, then we "or" the bad block information. 28 * If one of the bbt's is out of date or does not exist it is (re)created. 29 * If no bbt exists at all then the device is scanned for factory marked 30 * good / bad blocks and the bad block tables are created. 31 * 32 * For manufacturer created bbts like the one found on M-SYS DOC devices 33 * the bbt is searched and read but never created 34 * 35 * The autogenerated bad block table is located in the last good blocks 36 * of the device. The table is mirrored, so it can be updated eventually. 37 * The table is marked in the oob area with an ident pattern and a version 38 * number which indicates which of both tables is more up to date. 39 * 40 * The table uses 2 bits per block 41 * 11b: block is good 42 * 00b: block is factory marked bad 43 * 01b, 10b: block is marked bad due to wear 44 * 45 * The memory bad block table uses the following scheme: 46 * 00b: block is good 47 * 01b: block is marked bad due to wear 48 * 10b: block is reserved (to protect the bbt area) 49 * 11b: block is factory marked bad 50 * 51 * Multichip devices like DOC store the bad block info per floor. 52 * 53 * Following assumptions are made: 54 * - bbts start at a page boundary, if autolocated on a block boundary 55 * - the space necessary for a bbt in FLASH does not exceed a block boundary 56 * 57 */ 58 59 60#include <linux/slab.h> 61#include <linux/types.h> 62#include <linux/mtd/mtd.h> 63#include <linux/mtd/nand.h> 64#include <linux/mtd/nand_ecc.h> 65#include <linux/bitops.h> 66#include <linux/delay.h> 67#include <linux/vmalloc.h> 68 69#define NFLASH_SUPPORT 70 71#include <typedefs.h> 72#include <osl.h> 73#include <bcmutils.h> 74#include <bcmdevs.h> 75#include <bcmnvram.h> 76#include <siutils.h> 77#include <hndpci.h> 78#include <pcicfg.h> 79#include <hndsoc.h> 80#include <sbchipc.h> 81#include <nflash.h> 82 83#include "brcmnand_priv.h" 84 85#define PRINTK(...) 86 87extern int gClearBBT; 88extern int gdebug; 89 90char brcmNandBBTMsg[1024]; 91 92/* brcmnand= 93 * rescan: 1. Rescan for bad blocks, and update existing BBT 94 * showbbt: 2. Print out the contents of the BBT on boot up. 95 * 96 * The following commands are implemented but should be removed for 97 * production builds. 98 * Use userspace flash_eraseall instead. 99 * These were intended for development debugging only. 100 * erase: 7. Erase entire flash, except CFE, and rescan for bad blocks 101 * eraseall: 8. Erase entire flash, and rescan for bad blocks 102 * clearbbt: 9. Erase BBT and rescan for bad blocks. 103 * (DANGEROUS, may lose Mfg's BIs). 104 */ 105#define NANDCMD_RESCAN 1 106#define NANDCMD_SHOWBBT 2 107 108#define NANDCMD_ERASE 7 109#define NANDCMD_ERASEALL 8 110#define NANDCMD_CLEARBBT 9 111 112int brcmnand_update_bbt(struct mtd_info *mtd, loff_t offs); 113 114extern struct brcmnand_mtd brcmnand_info; 115 116static inline uint32_t device_size(struct mtd_info *mtd) 117{ 118 return mtd->size; 119} 120 121/** 122 * check_pattern - [GENERIC] check if a pattern is in the buffer 123 * @buf: the buffer to search 124 * @len: the length of buffer to search 125 * @paglen: the pagelength 126 * @td: search pattern descriptor 127 * 128 * Check for a pattern at the given place. Used to search bad block 129 * tables and good / bad block identifiers. 130 * If the SCAN_EMPTY option is set then check, if all bytes except the 131 * pattern area contain 0xff 132 * 133*/ 134static int check_pattern(uint8_t *buf, int len, int paglen, struct nand_bbt_descr *td) 135{ 136 int i, end = 0; 137 uint8_t *p = buf; 138 139 end = paglen + td->offs; 140 if (td->options & NAND_BBT_SCANEMPTY) { 141 for (i = 0; i < end; i++) { 142 if (p[i] != 0xff) 143 return -1; 144 } 145 } 146 p += end; 147 148 /* Compare the pattern */ 149 for (i = 0; i < td->len; i++) { 150 if (p[i] != td->pattern[i]) 151 return -1; 152 } 153 154 if (td->options & NAND_BBT_SCANEMPTY) { 155 p += td->len; 156 end += td->len; 157 for (i = end; i < len; i++) { 158 if (*p++ != 0xff) 159 return -1; 160 } 161 } 162 return 0; 163} 164 165/** 166 * check_short_pattern - [GENERIC] check if a pattern is in the buffer 167 * @buf: the buffer to search 168 * @td: search pattern descriptor 169 * 170 * Check for a pattern at the given place. Used to search bad block 171 * tables and good / bad block identifiers. Same as check_pattern, but 172 * no optional empty check 173 * 174*/ 175static int check_short_pattern(uint8_t *buf, struct nand_bbt_descr *td) 176{ 177 int i; 178 uint8_t *p = buf; 179 180 /* Compare the pattern */ 181 for (i = 0; i < td->len; i++) { 182 if (p[td->offs + i] != td->pattern[i]) 183 return -1; 184 } 185 return 0; 186} 187 188/** 189 * brcmnand_read_bbt - [GENERIC] Read the bad block table starting from page 190 * @mtd: MTD device structure 191 * @buf: temporary buffer 192 * @page: the starting page 193 * @num: the number of bbt descriptors to read 194 * @bits: number of bits per block 195 * @offs: offset in the memory table 196 * @reserved_block_code: Pattern to identify reserved blocks 197 * 198 * Read the bad block table starting from page. 199 * 200 */ 201static int brcmnand_read_bbt(struct mtd_info *mtd, uint8_t *buf, int page, int num, 202 int bits, int offs, int reserved_block_code) 203{ 204 int res, i, j, act = 0; 205 struct nand_chip *this = mtd->priv; 206 size_t retlen, len, totlen; 207 loff_t from; 208 uint8_t msk = (uint8_t) ((1 << bits) - 1); 209 si_t *sih = brcmnand_info.sih; 210 chipcregs_t *cc = brcmnand_info.cc; 211 osl_t *osh; 212 213 totlen = (num * bits) >> 3; 214 from = ((loff_t) page) << this->page_shift; 215 216 osh = si_osh(sih); 217 /* Clear ECC registers */ 218 W_REG(osh, &cc->nand_ecc_corr_addr, 0); 219 W_REG(osh, &cc->nand_ecc_corr_addr_x, 0); 220 W_REG(osh, &cc->nand_ecc_unc_addr, 0); 221 W_REG(osh, &cc->nand_ecc_unc_addr_x, 0); 222 223 while (totlen) { 224 len = min(totlen, (size_t) (1 << this->bbt_erase_shift)); 225 res = mtd->read(mtd, from, len, &retlen, buf); 226 if (res < 0) { 227 if (retlen != len) { 228 printk(KERN_INFO "nand_bbt: Error reading bad block table\n"); 229 return res; 230 } 231 printk(KERN_WARNING "nand_bbt: ECC error while reading bad block table\n"); 232 } 233 234 /* Analyse data */ 235 for (i = 0; i < len; i++) { 236 uint8_t dat = buf[i]; 237 for (j = 0; j < 8; j += bits, act += 2) { 238 uint8_t tmp = (dat >> j) & msk; 239 if (tmp == msk) 240 continue; 241 if (reserved_block_code && (tmp == reserved_block_code)) { 242 printk(KERN_DEBUG 243 "nand_read_bbt: Reserved block at 0x%08x\n", 244 ((offs << 2) + (act >> 1)) 245 << this->bbt_erase_shift); 246 this->bbt[offs + (act >> 3)] |= 0x2 << (act & 0x06); 247 mtd->ecc_stats.bbtblocks++; 248 continue; 249 } 250 /* Leave it for now, if its matured we can move this 251 * message to MTD_DEBUG_LEVEL0 252 */ 253 printk(KERN_DEBUG "nand_read_bbt: Bad block at 0x%08x\n", 254 ((offs << 2) + (act >> 1)) << this->bbt_erase_shift); 255 printk("nand_read_bbt: Bad block at 0x%08x\n", 256 ((offs << 2) + (act >> 1)) << this->bbt_erase_shift); 257 /* Factory marked bad or worn out ? */ 258 if (tmp == 0) 259 this->bbt[offs + (act >> 3)] |= 0x3 << (act & 0x06); 260 else 261 this->bbt[offs + (act >> 3)] |= 0x1 << (act & 0x06); 262 mtd->ecc_stats.badblocks++; 263 } 264 } 265 totlen -= len; 266 from += len; 267 } 268 return 0; 269} 270 271/** 272 * brcmnand_read_abs_bbt - [GENERIC] Read the bad block table starting at a given page 273 * @mtd: MTD device structure 274 * @buf: temporary buffer 275 * @td: descriptor for the bad block table 276 * @chip: read the table for a specific chip, -1 read all chips. 277 * Applies only if NAND_BBT_PERCHIP option is set 278 * 279 * Read the bad block table for all chips starting at a given page 280 * We assume that the bbt bits are in consecutive order. 281*/ 282static int brcmnand_read_abs_bbt(struct mtd_info *mtd, uint8_t *buf, 283 struct nand_bbt_descr *td, int chip) 284{ 285 struct nand_chip *this = mtd->priv; 286 int res = 0, i; 287 int bits; 288 289 bits = td->options & NAND_BBT_NRBITS_MSK; 290 if (td->options & NAND_BBT_PERCHIP) { 291 int offs = 0; 292 for (i = 0; i < this->numchips; i++) { 293 if (chip == -1 || chip == i) 294 res = brcmnand_read_bbt(mtd, buf, td->pages[i], 295 this->chipsize >> this->bbt_erase_shift, 296 bits, offs, td->reserved_block_code); 297 if (res) 298 return res; 299 offs += this->chipsize >> (this->bbt_erase_shift + 2); 300 } 301 } else { 302 res = brcmnand_read_bbt(mtd, buf, td->pages[0], 303 mtd->size >> this->bbt_erase_shift, bits, 0, td->reserved_block_code); 304 if (res) 305 return res; 306 } 307 return 0; 308} 309 310/* 311 * Scan read raw data from flash 312 */ 313static int brcmnand_scan_read_raw(struct mtd_info *mtd, uint8_t *buf, loff_t offs, 314 size_t len) 315{ 316 struct mtd_oob_ops ops; 317 318 ops.mode = MTD_OOB_RAW; 319 ops.ooboffs = 0; 320 ops.ooblen = mtd->oobsize; 321 ops.oobbuf = buf; 322 ops.datbuf = buf; 323 ops.len = len; 324 325 return mtd->read_oob(mtd, offs, &ops); 326} 327 328/* 329 * Scan write data with oob to flash 330 */ 331static int brcmnand_scan_write_bbt(struct mtd_info *mtd, loff_t offs, size_t len, 332 uint8_t *buf, uint8_t *oob) 333{ 334 struct mtd_oob_ops ops; 335 336 ops.mode = MTD_OOB_PLACE; 337 ops.ooboffs = 0; 338 ops.ooblen = mtd->oobsize; 339 ops.datbuf = buf; 340 ops.oobbuf = oob; 341 ops.len = len; 342 343 return mtd->write_oob(mtd, offs, &ops); 344} 345 346/** 347 * brcmnand_read_abs_bbts - [GENERIC] Read the bad block table(s) for all chips 348 * starting at a given page 349 * @mtd: MTD device structure 350 * @buf: temporary buffer 351 * @td: descriptor for the bad block table 352 * @md: descriptor for the bad block table mirror 353 * 354 * Read the bad block table(s) for all chips starting at a given page 355 * We assume that the bbt bits are in consecutive order. 356 * 357*/ 358static int brcmnand_read_abs_bbts(struct mtd_info *mtd, uint8_t *buf, 359 struct nand_bbt_descr *td, struct nand_bbt_descr *md) 360{ 361 struct nand_chip *this = mtd->priv; 362 363 /* Read the primary version, if available */ 364 if (td->options & NAND_BBT_VERSION) { 365 brcmnand_scan_read_raw(mtd, buf, td->pages[0] << this->page_shift, 366 mtd->writesize); 367 td->version[0] = buf[mtd->writesize + td->veroffs]; 368 printk(KERN_DEBUG "Bad block table at page %d, version 0x%02X\n", 369 td->pages[0], td->version[0]); 370 } 371 372 /* Read the mirror version, if available */ 373 if (md && (md->options & NAND_BBT_VERSION)) { 374 brcmnand_scan_read_raw(mtd, buf, md->pages[0] << this->page_shift, 375 mtd->writesize); 376 md->version[0] = buf[mtd->writesize + md->veroffs]; 377 printk(KERN_DEBUG "Bad block table at page %d, version 0x%02X\n", 378 md->pages[0], md->version[0]); 379 } 380 return 1; 381} 382 383/* 384 * Scan a given block full 385 */ 386static int brcmnand_scan_block_full(struct mtd_info *mtd, struct nand_bbt_descr *bd, 387 loff_t offs, uint8_t *buf, size_t readlen, int scanlen, int len) 388{ 389 int ret, j; 390 391 ret = brcmnand_scan_read_raw(mtd, buf, offs, readlen); 392 if (ret) 393 return ret; 394 395 for (j = 0; j < len; j++, buf += scanlen) { 396 if (check_pattern(buf, scanlen, mtd->writesize, bd)) 397 return 1; 398 } 399 return 0; 400} 401 402/* 403 * Scan a given block partially 404 */ 405static int brcmnand_scan_block_fast(struct mtd_info *mtd, struct nand_bbt_descr *bd, 406 loff_t offs, uint8_t *buf, int len) 407{ 408 struct mtd_oob_ops ops; 409 int j, ret; 410 int dir; 411 412 /* SLC: First and 2nd page */ 413 dir = 1; 414 ops.ooblen = mtd->oobsize; 415 ops.oobbuf = buf; 416 ops.ooboffs = 0; 417 ops.datbuf = NULL; 418 ops.mode = MTD_OOB_PLACE; 419 420 for (j = 0; j < len; j++) { 421 /* 422 * Read the full oob until read_oob is fixed to 423 * handle single byte reads for 16 bit 424 * buswidth 425 */ 426 ret = mtd->read_oob(mtd, offs, &ops); 427 if (ret) 428 return ret; 429 430 if (check_short_pattern(buf, bd)) 431 return 1; 432 433 offs += (dir * mtd->writesize); 434 } 435 return 0; 436} 437 438/** 439 * brcmnand_create_bbt - [GENERIC] Create a bad block table by scanning the device 440 * @mtd: MTD device structure 441 * @buf: temporary buffer 442 * @bd: descriptor for the good/bad block search pattern 443 * @chip: create the table for a specific chip, -1 read all chips. 444 * Applies only if NAND_BBT_PERCHIP option is set 445 * 446 * Create a bad block table by scanning the device 447 * for the given good/bad block identify pattern 448 */ 449static int brcmnand_create_bbt(struct mtd_info *mtd, uint8_t *buf, 450 struct nand_bbt_descr *bd, int chip) 451{ 452 struct nand_chip *this = mtd->priv; 453 int i, numblocks, len, scanlen; 454 int startblock; 455 loff_t from; 456 size_t readlen; 457 458 printk(KERN_INFO "Scanning device for bad blocks\n"); 459 460 if (bd->options & NAND_BBT_SCANALLPAGES) 461 len = 1 << (this->bbt_erase_shift - this->page_shift); 462 else { 463 if (bd->options & NAND_BBT_SCAN2NDPAGE) 464 len = 2; 465 else 466 len = 1; 467 } 468 469 if (!(bd->options & NAND_BBT_SCANEMPTY)) { 470 /* We need only read few bytes from the OOB area */ 471 scanlen = 0; 472 readlen = bd->len; 473 } else { 474 /* Full page content should be read */ 475 scanlen = mtd->writesize + mtd->oobsize; 476 readlen = len * mtd->writesize; 477 } 478 479 if (chip == -1) { 480 /* Note that numblocks is 2 * (real numblocks) here, see i+=2 481 * below as it makes shifting and masking less painful 482 */ 483 numblocks = mtd->size >> (this->bbt_erase_shift - 1); 484 startblock = 0; 485 from = 0; 486 } else { 487 if (chip >= this->numchips) { 488 printk(KERN_WARNING "create_bbt(): chipnr (%d) > available chips (%d)\n", 489 chip + 1, this->numchips); 490 return -EINVAL; 491 } 492 numblocks = this->chipsize >> (this->bbt_erase_shift - 1); 493 startblock = chip * numblocks; 494 numblocks += startblock; 495 from = startblock << (this->bbt_erase_shift - 1); 496 } 497 498 for (i = startblock; i < numblocks;) { 499 int ret; 500 501 if (bd->options & NAND_BBT_SCANALLPAGES) 502 ret = brcmnand_scan_block_full(mtd, bd, from, buf, readlen, 503 scanlen, len); 504 else 505 ret = brcmnand_scan_block_fast(mtd, bd, from, buf, len); 506 507 if (ret < 0) 508 return ret; 509 510 if (ret) { 511 this->bbt[i >> 3] |= 0x03 << (i & 0x6); 512 printk(KERN_WARNING "Bad eraseblock %d at 0x%08x\n", 513 i >> 1, (unsigned int)from); 514 mtd->ecc_stats.badblocks++; 515 } 516 517 i += 2; 518 from += (1 << this->bbt_erase_shift); 519 } 520 return 0; 521} 522 523/** 524 * brcmnand_search_bbt - [GENERIC] scan the device for a specific bad block table 525 * @mtd: MTD device structure 526 * @buf: temporary buffer 527 * @td: descriptor for the bad block table 528 * 529 * Read the bad block table by searching for a given ident pattern. 530 * Search is preformed either from the beginning up or from the end of 531 * the device downwards. The search starts always at the start of a 532 * block. 533 * If the option NAND_BBT_PERCHIP is given, each chip is searched 534 * for a bbt, which contains the bad block information of this chip. 535 * This is necessary to provide support for certain DOC devices. 536 * 537 * The bbt ident pattern resides in the oob area of the first page 538 * in a block. 539 */ 540static int brcmnand_search_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td) 541{ 542 struct nand_chip *this = mtd->priv; 543 int i, chips; 544 int bits, startblock, block, dir; 545 int scanlen = mtd->writesize + mtd->oobsize; 546 int bbtblocks; 547 int blocktopage = this->bbt_erase_shift - this->page_shift; 548 549 /* Search direction top -> down ? */ 550 if (td->options & NAND_BBT_LASTBLOCK) { 551 startblock = (mtd->size >> this->bbt_erase_shift) - 1; 552 dir = -1; 553 } else { 554 startblock = 0; 555 dir = 1; 556 } 557 558 /* Do we have a bbt per chip ? */ 559 if (td->options & NAND_BBT_PERCHIP) { 560 chips = this->numchips; 561 bbtblocks = this->chipsize >> this->bbt_erase_shift; 562 startblock &= bbtblocks - 1; 563 } else { 564 chips = 1; 565 bbtblocks = mtd->size >> this->bbt_erase_shift; 566 } 567 568 /* Number of bits for each erase block in the bbt */ 569 bits = td->options & NAND_BBT_NRBITS_MSK; 570 571 for (i = 0; i < chips; i++) { 572 /* Reset version information */ 573 td->version[i] = 0; 574 td->pages[i] = -1; 575 /* Scan the maximum number of blocks */ 576 for (block = 0; block < td->maxblocks; block++) { 577 578 int actblock = startblock + dir * block; 579 loff_t offs = actblock << this->bbt_erase_shift; 580 581 /* Read first page */ 582 brcmnand_scan_read_raw(mtd, buf, offs, mtd->writesize); 583 if (!check_pattern(buf, scanlen, mtd->writesize, td)) { 584 td->pages[i] = actblock << blocktopage; 585 if (td->options & NAND_BBT_VERSION) { 586 td->version[i] = buf[mtd->writesize + td->veroffs]; 587 } 588 break; 589 } 590 } 591 startblock += this->chipsize >> this->bbt_erase_shift; 592 } 593 /* Check, if we found a bbt for each requested chip */ 594 for (i = 0; i < chips; i++) { 595 if (td->pages[i] == -1) 596 printk(KERN_WARNING "Bad block table not found for chip %d\n", i); 597 else 598 printk(KERN_DEBUG "Bad block table found at page %d, version 0x%02X\n", 599 td->pages[i], td->version[i]); 600 } 601 return 0; 602} 603 604/** 605 * brcmnand_search_read_bbts - [GENERIC] scan the device for bad block table(s) 606 * @mtd: MTD device structure 607 * @buf: temporary buffer 608 * @td: descriptor for the bad block table 609 * @md: descriptor for the bad block table mirror 610 * 611 * Search and read the bad block table(s) 612*/ 613static int brcmnand_search_read_bbts(struct mtd_info *mtd, uint8_t *buf, 614 struct nand_bbt_descr *td, struct nand_bbt_descr *md) 615{ 616 /* Search the primary table */ 617 brcmnand_search_bbt(mtd, buf, td); 618 619 /* Search the mirror table */ 620 if (md) 621 brcmnand_search_bbt(mtd, buf, md); 622 623 /* Force result check */ 624 return 1; 625} 626 627/** 628 * brcmnand_write_bbt - [GENERIC] (Re)write the bad block table 629 * 630 * @mtd: MTD device structure 631 * @buf: temporary buffer 632 * @td: descriptor for the bad block table 633 * @md: descriptor for the bad block table mirror 634 * @chipsel: selector for a specific chip, -1 for all 635 * 636 * (Re)write the bad block table 637 * 638*/ 639static int brcmnand_write_bbt(struct mtd_info *mtd, uint8_t *buf, 640 struct nand_bbt_descr *td, struct nand_bbt_descr *md, int chipsel) 641{ 642 struct nand_chip *this = mtd->priv; 643 struct erase_info einfo; 644 int i, j, res, chip = 0; 645 int bits, startblock, dir, page, offs, numblocks, sft, sftmsk; 646 int nrchips, bbtoffs, pageoffs, ooboffs; 647 uint8_t msk[4]; 648 uint8_t rcode = td->reserved_block_code; 649 size_t retlen, len = 0; 650 loff_t to; 651 struct mtd_oob_ops ops; 652 653 ops.ooblen = mtd->oobsize; 654 ops.ooboffs = 0; 655 ops.datbuf = NULL; 656 ops.mode = MTD_OOB_PLACE; 657 658 if (!rcode) 659 rcode = 0xff; 660 /* Write bad block table per chip rather than per device ? */ 661 if (td->options & NAND_BBT_PERCHIP) { 662 numblocks = (int)(this->chipsize >> this->bbt_erase_shift); 663 /* Full device write or specific chip ? */ 664 if (chipsel == -1) { 665 nrchips = this->numchips; 666 } else { 667 nrchips = chipsel + 1; 668 chip = chipsel; 669 } 670 } else { 671 numblocks = (int)(mtd->size >> this->bbt_erase_shift); 672 nrchips = 1; 673 } 674 675 /* Loop through the chips */ 676 for (; chip < nrchips; chip++) { 677 678 /* There was already a version of the table, reuse the page 679 * This applies for absolute placement too, as we have the 680 * page nr. in td->pages. 681 */ 682 if (td->pages[chip] != -1) { 683 page = td->pages[chip]; 684 goto write; 685 } 686 687 /* Automatic placement of the bad block table */ 688 /* Search direction top -> down ? */ 689 if (td->options & NAND_BBT_LASTBLOCK) { 690 startblock = numblocks * (chip + 1) - 1; 691 dir = -1; 692 } else { 693 startblock = chip * numblocks; 694 dir = 1; 695 } 696 697 for (i = 0; i < td->maxblocks; i++) { 698 int block = startblock + dir * i; 699 /* Check, if the block is bad */ 700 switch ((this->bbt[block >> 2] >> 701 (2 * (block & 0x03))) & 0x03) { 702 case 0x01: 703 case 0x03: 704 continue; 705 } 706 page = block << 707 (this->bbt_erase_shift - this->page_shift); 708 /* Check, if the block is used by the mirror table */ 709 if (!md || md->pages[chip] != page) 710 goto write; 711 } 712 printk(KERN_ERR "No space left to write bad block table\n"); 713 return -ENOSPC; 714 write: 715 716 /* Set up shift count and masks for the flash table */ 717 bits = td->options & NAND_BBT_NRBITS_MSK; 718 msk[2] = ~rcode; 719 switch (bits) { 720 case 1: sft = 3; sftmsk = 0x07; msk[0] = 0x00; msk[1] = 0x01; 721 msk[3] = 0x01; 722 break; 723 case 2: sft = 2; sftmsk = 0x06; msk[0] = 0x00; msk[1] = 0x01; 724 msk[3] = 0x03; 725 break; 726 case 4: sft = 1; sftmsk = 0x04; msk[0] = 0x00; msk[1] = 0x0C; 727 msk[3] = 0x0f; 728 break; 729 case 8: sft = 0; sftmsk = 0x00; msk[0] = 0x00; msk[1] = 0x0F; 730 msk[3] = 0xff; 731 break; 732 default: return -EINVAL; 733 } 734 735 bbtoffs = chip * (numblocks >> 2); 736 737 to = ((loff_t) page) << this->page_shift; 738 739 /* Must we save the block contents ? */ 740 if (td->options & NAND_BBT_SAVECONTENT) { 741 /* Make it block aligned */ 742 to &= ~((loff_t) ((1 << this->bbt_erase_shift) - 1)); 743 len = 1 << this->bbt_erase_shift; 744 res = mtd->read(mtd, to, len, &retlen, buf); 745 if (res < 0) { 746 if (retlen != len) { 747 printk(KERN_INFO "nand_bbt: Error " 748 "reading block for writing " 749 "the bad block table\n"); 750 return res; 751 } 752 printk(KERN_WARNING "nand_bbt: ECC error " 753 "while reading block for writing " 754 "bad block table\n"); 755 } 756 /* Read oob data */ 757 ops.ooblen = (len >> this->page_shift) * mtd->oobsize; 758 ops.oobbuf = &buf[len]; 759 res = mtd->read_oob(mtd, to + mtd->writesize, &ops); 760 if (res < 0 || ops.oobretlen != ops.ooblen) 761 goto outerr; 762 763 /* Calc the byte offset in the buffer */ 764 pageoffs = page - (int)(to >> this->page_shift); 765 offs = pageoffs << this->page_shift; 766 /* Preset the bbt area with 0xff */ 767 memset(&buf[offs], 0xff, (size_t) (numblocks >> sft)); 768 ooboffs = len + (pageoffs * mtd->oobsize); 769 770 } else { 771 /* Calc length */ 772 len = (size_t) (numblocks >> sft); 773 /* Make it page aligned ! */ 774 len = (len + (mtd->writesize - 1)) & 775 ~(mtd->writesize - 1); 776 /* Preset the buffer with 0xff */ 777 memset(buf, 0xff, len + 778 (len >> this->page_shift)* mtd->oobsize); 779 offs = 0; 780 ooboffs = len; 781 /* Pattern is located in oob area of first page */ 782 memcpy(&buf[ooboffs + td->offs], td->pattern, td->len); 783 } 784 785 if (td->options & NAND_BBT_VERSION) 786 buf[ooboffs + td->veroffs] = td->version[chip]; 787 788 /* walk through the memory table */ 789 for (i = 0; i < numblocks;) { 790 uint8_t dat; 791 dat = this->bbt[bbtoffs + (i >> 2)]; 792 for (j = 0; j < 4; j++, i++) { 793 int sftcnt = (i << (3 - sft)) & sftmsk; 794 /* Do not store the reserved bbt blocks ! */ 795 buf[offs + (i >> sft)] &= 796 ~(msk[dat & 0x03] << sftcnt); 797 dat >>= 2; 798 } 799 } 800 801 memset(&einfo, 0, sizeof(einfo)); 802 einfo.mtd = mtd; 803 einfo.addr = (unsigned long)to; 804 einfo.len = 1 << this->bbt_erase_shift; 805 res = mtd->erase(mtd, &einfo ); 806 if (res < 0) 807 goto outerr; 808 809 res = brcmnand_scan_write_bbt(mtd, to, len, buf, &buf[len]); 810 if (res < 0) 811 goto outerr; 812 813 printk(KERN_DEBUG "Bad block table written to 0x%08x, version " 814 "0x%02X\n", (unsigned int)to, td->version[chip]); 815 816 /* Mark it as used */ 817 td->pages[chip] = page; 818 } 819 return 0; 820 821outerr: 822 printk(KERN_WARNING 823 "nand_bbt: Error while writing bad block table %d\n", res); 824 return res; 825} 826 827/** 828 * brcmnand_memory_bbt - [GENERIC] create a memory based bad block table 829 * @mtd: MTD device structure 830 * @bd: descriptor for the good/bad block search pattern 831 * 832 * The function creates a memory based bbt by scanning the device 833 * for manufacturer / software marked good / bad blocks 834*/ 835static inline int brcmnand_memory_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd) 836{ 837 struct nand_chip *this = mtd->priv; 838 839 bd->options &= ~NAND_BBT_SCANEMPTY; 840 return brcmnand_create_bbt(mtd, this->buffers->databuf, bd, -1); 841} 842 843/** 844 * brcmnand_check_create - [GENERIC] create and write bbt(s) if necessary 845 * @mtd: MTD device structure 846 * @buf: temporary buffer 847 * @bd: descriptor for the good/bad block search pattern 848 * 849 * The function checks the results of the previous call to read_bbt 850 * and creates / updates the bbt(s) if necessary 851 * Creation is necessary if no bbt was found for the chip/device 852 * Update is necessary if one of the tables is missing or the 853 * version nr. of one table is less than the other 854*/ 855static int brcmnand_check_create(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *bd) 856{ 857 int i, chips, writeops, chipsel, res; 858 struct nand_chip *this = mtd->priv; 859 struct nand_bbt_descr *td = this->bbt_td; 860 struct nand_bbt_descr *md = this->bbt_md; 861 struct nand_bbt_descr *rd, *rd2; 862 863 /* Do we have a bbt per chip ? */ 864 if (td->options & NAND_BBT_PERCHIP) 865 chips = this->numchips; 866 else 867 chips = 1; 868 869 for (i = 0; i < chips; i++) { 870 writeops = 0; 871 rd = NULL; 872 rd2 = NULL; 873 /* Per chip or per device ? */ 874 chipsel = (td->options & NAND_BBT_PERCHIP) ? i : -1; 875 /* Mirrored table avilable ? */ 876 if (md) { 877 if (td->pages[i] == -1 && md->pages[i] == -1) { 878 writeops = 0x03; 879 goto create; 880 } 881 882 if (td->pages[i] == -1) { 883 rd = md; 884 td->version[i] = md->version[i]; 885 writeops = 1; 886 goto writecheck; 887 } 888 889 if (md->pages[i] == -1) { 890 rd = td; 891 md->version[i] = td->version[i]; 892 writeops = 2; 893 goto writecheck; 894 } 895 896 if (td->version[i] == md->version[i]) { 897 rd = td; 898 if (!(td->options & NAND_BBT_VERSION)) 899 rd2 = md; 900 goto writecheck; 901 } 902 903 if (((int8_t) (td->version[i] - md->version[i])) > 0) { 904 rd = td; 905 md->version[i] = td->version[i]; 906 writeops = 2; 907 } else { 908 rd = md; 909 td->version[i] = md->version[i]; 910 writeops = 1; 911 } 912 913 goto writecheck; 914 915 } else { 916 if (td->pages[i] == -1) { 917 writeops = 0x01; 918 goto create; 919 } 920 rd = td; 921 goto writecheck; 922 } 923 create: 924 /* Create the bad block table by scanning the device ? */ 925 if (!(td->options & NAND_BBT_CREATE)) 926 continue; 927 928 /* Create the table in memory by scanning the chip(s) */ 929 brcmnand_create_bbt(mtd, buf, bd, chipsel); 930 931 td->version[i] = 1; 932 if (md) 933 md->version[i] = 1; 934 writecheck: 935 /* read back first ? */ 936 if (rd) 937 brcmnand_read_abs_bbt(mtd, buf, rd, chipsel); 938 /* If they weren't versioned, read both. */ 939 if (rd2) 940 brcmnand_read_abs_bbt(mtd, buf, rd2, chipsel); 941 942 /* Write the bad block table to the device ? */ 943 if ((writeops & 0x01) && (td->options & NAND_BBT_WRITE)) { 944 res = brcmnand_write_bbt(mtd, buf, td, md, chipsel); 945 if (res < 0) 946 return res; 947 } 948 949 /* Write the mirror bad block table to the device ? */ 950 if ((writeops & 0x02) && md && (md->options & NAND_BBT_WRITE)) { 951 res = brcmnand_write_bbt(mtd, buf, md, td, chipsel); 952 if (res < 0) 953 return res; 954 } 955 } 956 return 0; 957} 958 959/** 960 * mark_bbt_regions - [GENERIC] mark the bad block table regions 961 * @mtd: MTD device structure 962 * @td: bad block table descriptor 963 * 964 * The bad block table regions are marked as "bad" to prevent 965 * accidental erasures / writes. The regions are identified by 966 * the mark 0x02. 967*/ 968static void mark_bbt_region(struct mtd_info *mtd, struct nand_bbt_descr *td) 969{ 970 struct nand_chip *this = mtd->priv; 971 int i, j, chips, block, nrblocks, update; 972 uint8_t oldval, newval; 973 974 /* Do we have a bbt per chip ? */ 975 if (td->options & NAND_BBT_PERCHIP) { 976 chips = this->numchips; 977 nrblocks = (int)(this->chipsize >> this->bbt_erase_shift); 978 } else { 979 chips = 1; 980 nrblocks = (int)(mtd->size >> this->bbt_erase_shift); 981 } 982 983 for (i = 0; i < chips; i++) { 984 if ((td->options & NAND_BBT_ABSPAGE) || 985 !(td->options & NAND_BBT_WRITE)) { 986 if (td->pages[i] == -1) 987 continue; 988 block = td->pages[i] >> (this->bbt_erase_shift - this->page_shift); 989 block <<= 1; 990 oldval = this->bbt[(block >> 3)]; 991 newval = oldval | (0x2 << (block & 0x06)); 992 this->bbt[(block >> 3)] = newval; 993 if ((oldval != newval) && td->reserved_block_code) 994 brcmnand_update_bbt(mtd, block << (this->bbt_erase_shift - 1)); 995 continue; 996 } 997 update = 0; 998 if (td->options & NAND_BBT_LASTBLOCK) 999 block = ((i + 1) * nrblocks) - td->maxblocks; 1000 else 1001 block = i * nrblocks; 1002 block <<= 1; 1003 for (j = 0; j < td->maxblocks; j++) { 1004 oldval = this->bbt[(block >> 3)]; 1005 newval = oldval | (0x2 << (block & 0x06)); 1006 this->bbt[(block >> 3)] = newval; 1007 if (oldval != newval) 1008 update = 1; 1009 block += 2; 1010 } 1011 /* If we want reserved blocks to be recorded to flash, and some 1012 * new ones have been marked, then we need to update the stored 1013 * bbts. This should only happen once. 1014 */ 1015 if (update && td->reserved_block_code) 1016 brcmnand_update_bbt(mtd, (block - 2) << (this->bbt_erase_shift - 1)); 1017 } 1018} 1019 1020/** 1021 * brcmnand_scan_bbt - [NAND Interface] scan, find, read and maybe create bad block table(s) 1022 * @mtd: MTD device structure 1023 * @bd: descriptor for the good/bad block search pattern 1024 * 1025 * The function checks, if a bad block table(s) is/are already 1026 * available. If not it scans the device for manufacturer 1027 * marked good / bad blocks and writes the bad block table(s) to 1028 * the selected place. 1029 * 1030 * The bad block table memory is allocated here. It must be freed 1031 * by calling the nand_free_bbt function. 1032 * 1033*/ 1034int brcmnand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd) 1035{ 1036 struct nand_chip *this = mtd->priv; 1037 int len, res = 0; 1038 uint8_t *buf; 1039 struct nand_bbt_descr *td = this->bbt_td; 1040 struct nand_bbt_descr *md = this->bbt_md; 1041 1042 len = mtd->size >> (this->bbt_erase_shift + 2); 1043 /* Allocate memory (2bit per block) and clear the memory bad block table */ 1044 this->bbt = kzalloc(len, GFP_KERNEL); 1045 if (!this->bbt) { 1046 printk(KERN_ERR "nand_scan_bbt: Out of memory\n"); 1047 return -ENOMEM; 1048 } 1049 1050 /* If no primary table decriptor is given, scan the device 1051 * to build a memory based bad block table 1052 */ 1053 if (!td) { 1054 if ((res = brcmnand_memory_bbt(mtd, bd))) { 1055 printk(KERN_ERR "nand_bbt: Can't scan flash and build the RAM-based BBT\n"); 1056 kfree(this->bbt); 1057 this->bbt = NULL; 1058 } 1059 return res; 1060 } 1061 1062 /* Allocate a temporary buffer for one eraseblock incl. oob */ 1063 len = (1 << this->bbt_erase_shift); 1064 len += (len >> this->page_shift) * mtd->oobsize; 1065 buf = vmalloc(len); 1066 if (!buf) { 1067 printk(KERN_ERR "nand_bbt: Out of memory\n"); 1068 kfree(this->bbt); 1069 this->bbt = NULL; 1070 return -ENOMEM; 1071 } 1072 1073 /* Is the bbt at a given page ? */ 1074 if (td->options & NAND_BBT_ABSPAGE) { 1075 res = brcmnand_read_abs_bbts(mtd, buf, td, md); 1076 } else { 1077 /* Search the bad block table using a pattern in oob */ 1078 res = brcmnand_search_read_bbts(mtd, buf, td, md); 1079 } 1080 1081 if (res) 1082 res = brcmnand_check_create(mtd, buf, bd); 1083 1084 /* Prevent the bbt regions from erasing / writing */ 1085 mark_bbt_region(mtd, td); 1086 if (md) 1087 mark_bbt_region(mtd, md); 1088 1089 vfree(buf); 1090 return res; 1091} 1092 1093 1094/** 1095 * brcmnand_update_bbt - [NAND Interface] update bad block table(s) 1096 * @mtd: MTD device structure 1097 * @offs: the offset of the newly marked block 1098 * 1099 * The function updates the bad block table(s) 1100*/ 1101int brcmnand_update_bbt(struct mtd_info *mtd, loff_t offs) 1102{ 1103 struct nand_chip *this = mtd->priv; 1104 int len, res = 0, writeops = 0; 1105 int chip, chipsel; 1106 uint8_t *buf; 1107 struct nand_bbt_descr *td = this->bbt_td; 1108 struct nand_bbt_descr *md = this->bbt_md; 1109 1110 if (!this->bbt || !td) 1111 return -EINVAL; 1112 1113 len = mtd->size >> (this->bbt_erase_shift + 2); 1114 /* Allocate a temporary buffer for one eraseblock incl. oob */ 1115 len = (1 << this->bbt_erase_shift); 1116 len += (len >> this->page_shift) * mtd->oobsize; 1117 buf = kmalloc(len, GFP_KERNEL); 1118 if (!buf) { 1119 printk(KERN_ERR "nand_update_bbt: Out of memory\n"); 1120 return -ENOMEM; 1121 } 1122 1123 writeops = md != NULL ? 0x03 : 0x01; 1124 1125 /* Do we have a bbt per chip ? */ 1126 if (td->options & NAND_BBT_PERCHIP) { 1127 chip = (int)(offs >> this->chip_shift); 1128 chipsel = chip; 1129 } else { 1130 chip = 0; 1131 chipsel = -1; 1132 } 1133 1134 td->version[chip]++; 1135 if (md) 1136 md->version[chip]++; 1137 1138 /* Write the bad block table to the device ? */ 1139 if ((writeops & 0x01) && (td->options & NAND_BBT_WRITE)) { 1140 res = brcmnand_write_bbt(mtd, buf, td, md, chipsel); 1141 if (res < 0) 1142 goto out; 1143 } 1144 /* Write the mirror bad block table to the device ? */ 1145 if ((writeops & 0x02) && md && (md->options & NAND_BBT_WRITE)) { 1146 res = brcmnand_write_bbt(mtd, buf, md, td, chipsel); 1147 } 1148 1149out: 1150 kfree(buf); 1151 return res; 1152} 1153 1154/* Define some generic bad / good block scan pattern which are used 1155 * while scanning a device for factory marked good / bad blocks. 1156 */ 1157static uint8_t scan_ff_pattern[] = { 0xff, 0xff }; 1158 1159static struct nand_bbt_descr smallpage_memorybased = { 1160 .options = NAND_BBT_SCAN2NDPAGE, 1161 .offs = 5, 1162 .len = 1, 1163 .pattern = scan_ff_pattern 1164}; 1165 1166static struct nand_bbt_descr largepage_memorybased = { 1167 .options = 0, 1168 .offs = 0, 1169 .len = 2, 1170 .pattern = scan_ff_pattern 1171}; 1172 1173static struct nand_bbt_descr smallpage_flashbased = { 1174 .options = NAND_BBT_SCAN2NDPAGE, 1175 .offs = 5, 1176 .len = 1, 1177 .pattern = scan_ff_pattern 1178}; 1179 1180static struct nand_bbt_descr largepage_flashbased = { 1181 .options = NAND_BBT_SCAN2NDPAGE, 1182 .offs = 0, 1183 .len = 2, 1184 .pattern = scan_ff_pattern 1185}; 1186 1187/* 2K & 4K page MLC NAND use same pattern */ 1188static struct nand_bbt_descr bch4_flashbased = { 1189 .options = NAND_BBT_SCAN2NDPAGE, 1190 .offs = 0, 1191 .len = 1, 1192 .pattern = scan_ff_pattern 1193}; 1194 1195static uint8_t scan_agand_pattern[] = { 0x1C, 0x71, 0xC7, 0x1C, 0x71, 0xC7 }; 1196 1197static struct nand_bbt_descr agand_flashbased = { 1198 .options = NAND_BBT_SCANEMPTY | NAND_BBT_SCANALLPAGES, 1199 .offs = 0x20, 1200 .len = 6, 1201 .pattern = scan_agand_pattern 1202}; 1203 1204/* Generic flash bbt decriptors 1205*/ 1206static uint8_t bbt_pattern[] = {'B', 'b', 't', '0' }; 1207static uint8_t mirror_pattern[] = {'1', 't', 'b', 'B' }; 1208 1209/* 1210 * THT: We only have 1 chip per device 1211 */ 1212static struct nand_bbt_descr bbt_main_descr = { 1213 .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE 1214 | NAND_BBT_2BIT | NAND_BBT_VERSION /* | NAND_BBT_PERCHIP */, 1215 .offs = 9, /* THT: Changed from 8 */ 1216 .len = 4, 1217 .veroffs = 13, /* THT: Changed from 12 */ 1218 .maxblocks = 4, /* THT: Will update later, based on 1MB partition for BBT */ 1219 .pattern = bbt_pattern 1220}; 1221 1222static struct nand_bbt_descr bbt_mirror_descr = { 1223 .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE 1224 | NAND_BBT_2BIT | NAND_BBT_VERSION /* | NAND_BBT_PERCHIP */, 1225 .offs = 9, /* THT: Changed from 8 */ 1226 .len = 4, 1227 .veroffs = 13, /* THT: Changed from 12 */ 1228 .maxblocks = 4, 1229 .pattern = mirror_pattern 1230}; 1231 1232/* SLC flash using BCH-4 ECC, SM & Large page use same descriptor template */ 1233static struct nand_bbt_descr bbt_slc_bch4_main_descr = { 1234 .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE 1235 | NAND_BBT_2BIT | NAND_BBT_VERSION /* | NAND_BBT_PERCHIP */, 1236 .offs = 1, /* THT: Changed from 8 */ 1237 .len = 4, 1238 .veroffs = 6, /* THT: Changed from 12 */ 1239 .maxblocks = 8, 1240 .pattern = bbt_pattern 1241}; 1242 1243static struct nand_bbt_descr bbt_slc_bch4_mirror_descr = { 1244 .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE 1245 | NAND_BBT_2BIT | NAND_BBT_VERSION /* | NAND_BBT_PERCHIP */, 1246 .offs = 1, 1247 .len = 4, 1248 .veroffs = 6, 1249 .maxblocks = 8, 1250 .pattern = mirror_pattern 1251}; 1252 1253static struct nand_bbt_descr bbt_bch4_main_descr = { 1254 .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE 1255 | NAND_BBT_2BIT | NAND_BBT_VERSION /* | NAND_BBT_PERCHIP */, 1256 .offs = 1, 1257 .len = 4, 1258 .veroffs = 5, /* THT: Changed from 12 */ 1259 .maxblocks = 8, /* THT: Will update later, based on 4MB partition for BBT */ 1260 .pattern = bbt_pattern 1261}; 1262 1263static struct nand_bbt_descr bbt_bch4_mirror_descr = { 1264 .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE 1265 | NAND_BBT_2BIT | NAND_BBT_VERSION /* | NAND_BBT_PERCHIP */, 1266 .offs = 1, /* THT: Changed from 8 */ 1267 .len = 4, 1268 .veroffs = 5, /* THT: Changed from 12 */ 1269 .maxblocks = 8, 1270 .pattern = mirror_pattern 1271}; 1272 1273/** 1274 * brcmnand_isbad_bbt - [NAND Interface] Check if a block is bad 1275 * @mtd: MTD device structure 1276 * @offs: offset in the device 1277 * @allowbbt: allow access to bad block table region 1278 * 1279 * Each byte in the BBT contains 4 entries, 2 bits each per block. 1280 * So the entry for the block b is: 1281 * bbt[b >> 2] & (0x3 << ((b & 0x3) << 1))) 1282 * 1283*/ 1284int brcmnand_isbad_bbt(struct mtd_info *mtd, loff_t offs, int allowbbt) 1285{ 1286 struct nand_chip *this = mtd->priv; 1287 uint32_t block; /* Used as an index, so 32bit. */ 1288 uint8_t res; 1289 1290 /* THT 03/20/07: Get block number. It's more convenient to do it in the 1291 * following way but is actually the same thing as in comment the above 1292 */ 1293 block = (uint32_t) (offs >> (this->bbt_erase_shift - 1)); 1294 res = (this->bbt[block >> 3] >> (block & 0x06)) & 0x03; 1295 DEBUG(MTD_DEBUG_LEVEL3, "brcmnand_isbad_bbt(): bbt info for offs " 1296 "0x%08x: (block %d) 0x%02x\n", (unsigned int)offs, block >> 1, res); 1297 if (res) 1298 printk("brcmnand_isbad_bbt(): bbt info for offs " 1299 "0x%08x: (block %d) 0x%02x\n", (unsigned int)offs, block >> 1, res); 1300 1301 switch ((int)res) { 1302 case 0x00: 1303 /* Good block */ 1304 return 0; 1305 case 0x01: 1306 /* Marked bad due to wear */ 1307 return 1; 1308 case 0x02: 1309 /* Reserved blocks */ 1310 return allowbbt ? 0 : 1; 1311 } 1312 return 1; 1313} 1314 1315/** 1316 * brcmnand_default_bbt - [NAND Interface] Select a default bad block table for the device 1317 * @mtd: MTD device structure 1318 * 1319 * This function selects the default bad block table 1320 * support for the device and calls the nand_scan_bbt function 1321 * 1322*/ 1323int brcmnand_default_bbt(struct mtd_info *mtd) 1324{ 1325 struct nand_chip *this = mtd->priv; 1326 int ret; 1327 1328 mtd->get_device( mtd ); 1329 /* Default for AG-AND. We must use a flash based 1330 * bad block table as the devices have factory marked 1331 * _good_ blocks. Erasing those blocks leads to loss 1332 * of the good / bad information, so we _must_ store 1333 * this information in a good / bad table during 1334 * startup 1335 */ 1336 if (this->options & NAND_IS_AND) { 1337 /* Use the default pattern descriptors */ 1338 if (!this->bbt_td) { 1339 this->bbt_td = &bbt_main_descr; 1340 this->bbt_md = &bbt_mirror_descr; 1341 } 1342 this->options |= NAND_USE_FLASH_BBT; 1343 ret = brcmnand_scan_bbt(mtd, &agand_flashbased); 1344 mtd->put_device(mtd); 1345 return ret; 1346 } 1347 1348 /* Is a flash based bad block table requested ? */ 1349 if (this->options & NAND_USE_FLASH_BBT) { 1350 if (this->ecc.bytes == 3) { 1351 /* Use the default pattern descriptors */ 1352 if (!this->bbt_td) { 1353 this->bbt_td = &bbt_main_descr; 1354 this->bbt_md = &bbt_mirror_descr; 1355 } 1356 if (!this->badblock_pattern) { 1357 this->badblock_pattern = (mtd->writesize > 512) ? 1358 &largepage_flashbased : &smallpage_flashbased; 1359 } 1360 } else { 1361 if(this->cellinfo & NAND_CI_CELLTYPE_MSK) { 1362 if (!this->bbt_td) { 1363 this->bbt_td = &bbt_bch4_main_descr; 1364 this->bbt_md = &bbt_bch4_mirror_descr; 1365 } 1366 if (!this->badblock_pattern) { 1367 /* 2K and 4K MLC NAND use the same pattern */ 1368 this->badblock_pattern = &bch4_flashbased; 1369 } 1370 } else { 1371 /* SLC using BCH-4 ECC */ 1372 if (!this->bbt_td) { 1373 this->bbt_td = &bbt_slc_bch4_main_descr; 1374 this->bbt_md = &bbt_slc_bch4_mirror_descr; 1375 } 1376 if (!this->badblock_pattern) { 1377 /* 2K and 4K MLC NAND use the same pattern */ 1378 this->badblock_pattern = (mtd->writesize > 512) ? 1379 &bch4_flashbased : &smallpage_flashbased; 1380 } 1381 } 1382 } 1383 } else { 1384 this->bbt_td = NULL; 1385 this->bbt_md = NULL; 1386 if (!this->badblock_pattern) { 1387 this->badblock_pattern = (mtd->writesize > 512) ? 1388 &largepage_memorybased : &smallpage_memorybased; 1389 } 1390 } 1391 1392 /* BBT partition occupies 1 MB at the end of the useable flash, so adjust 1393 * maxblocks accordingly. Only applies to flash with 512MB or less, since 1394 * we don't have the extra reserved space at the end of the flash 1395 * (1FF0_0000 - 1FFF_FFFF). 1396 */ 1397 if (mtd->size <= (512 << 20)) { 1398 this->bbt_td->maxblocks = this->bbt_md->maxblocks = 1399 (1 << (20 - this->bbt_erase_shift)); 1400 } 1401 ret = brcmnand_scan_bbt(mtd, this->badblock_pattern); 1402 mtd->put_device(mtd); 1403 return ret; 1404} 1405 1406EXPORT_SYMBOL(brcmnand_scan_bbt); 1407EXPORT_SYMBOL(brcmnand_default_bbt); 1408