11da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 21da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * drivers/mtd/nand_bbt.c 31da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 41da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Overview: 51da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Bad block table support for the NAND driver 661b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner * 71da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Copyright (C) 2004 Thomas Gleixner (tglx@linutronix.de) 81da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 91da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * This program is free software; you can redistribute it and/or modify 101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * it under the terms of the GNU General Public License version 2 as 111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * published by the Free Software Foundation. 121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Description: 141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 1561b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner * When nand_scan_bbt is called, then it tries to find the bad block table 167cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior * depending on the options in the BBT descriptor(s). If no flash based BBT 17bb9ebd4e714385a2592a482845865ef2d58b2868Brian Norris * (NAND_BBT_USE_FLASH) is specified then the device is scanned for factory 187cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior * marked good / bad blocks. This information is used to create a memory BBT. 197cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior * Once a new bad block is discovered then the "factory" information is updated 207cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior * on the device. 217cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior * If a flash based BBT is specified then the function first tries to find the 227cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior * BBT on flash. If a BBT is found then the contents are read and the memory 237cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior * based BBT is created. If a mirrored BBT is selected then the mirror is 247cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior * searched too and the versions are compared. If the mirror has a greater 257cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior * version number than the mirror BBT is used to build the memory based BBT. 261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * If the tables are not versioned, then we "or" the bad block information. 277cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior * If one of the BBTs is out of date or does not exist it is (re)created. 287cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior * If no BBT exists at all then the device is scanned for factory marked 2961b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner * good / bad blocks and the bad block tables are created. 301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 317cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior * For manufacturer created BBTs like the one found on M-SYS DOC devices 327cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior * the BBT is searched and read but never created 331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 347cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior * The auto generated bad block table is located in the last good blocks 3561b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner * of the device. The table is mirrored, so it can be updated eventually. 367cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior * The table is marked in the OOB area with an ident pattern and a version 377cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior * number which indicates which of both tables is more up to date. If the NAND 387cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior * controller needs the complete OOB area for the ECC information then the 39bb9ebd4e714385a2592a482845865ef2d58b2868Brian Norris * option NAND_BBT_NO_OOB should be used (along with NAND_BBT_USE_FLASH, of 40a40f73419f02e40555f692785ea1c1813d5b4c12Brian Norris * course): it moves the ident pattern and the version byte into the data area 41a40f73419f02e40555f692785ea1c1813d5b4c12Brian Norris * and the OOB area will remain untouched. 421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * The table uses 2 bits per block 447cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior * 11b: block is good 457cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior * 00b: block is factory marked bad 467cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior * 01b, 10b: block is marked bad due to wear 471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * The memory bad block table uses the following scheme: 491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 00b: block is good 501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 01b: block is marked bad due to wear 511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 10b: block is reserved (to protect the bbt area) 521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 11b: block is factory marked bad 5361b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner * 541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Multichip devices like DOC store the bad block info per floor. 551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Following assumptions are made: 571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * - bbts start at a page boundary, if autolocated on a block boundary 58e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse * - the space necessary for a bbt in FLASH does not exceed a block boundary 5961b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner * 601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/slab.h> 631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/types.h> 641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/mtd/mtd.h> 651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/mtd/nand.h> 661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/mtd/nand_ecc.h> 671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/bitops.h> 681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/delay.h> 69c3f8abf481c2d2b221b028f7369bc6dd39a9590eDavid Woodhouse#include <linux/vmalloc.h> 70f3bcc0179ab8145615a3b409d652cad1395fb7f3Paul Gortmaker#include <linux/export.h> 711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 727cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewiorstatic int check_pattern_no_oob(uint8_t *buf, struct nand_bbt_descr *td) 737cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior{ 747cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior int ret; 757cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior 767cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior ret = memcmp(buf, td->pattern, td->len); 777cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior if (!ret) 787cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior return ret; 797cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior return -1; 807cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior} 817cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior 8261b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner/** 831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * check_pattern - [GENERIC] check if a pattern is in the buffer 848b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @buf: the buffer to search 858b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @len: the length of buffer to search 868b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @paglen: the pagelength 878b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @td: search pattern descriptor 881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 898b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * Check for a pattern at the given place. Used to search bad block tables and 908b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * good / bad block identifiers. If the SCAN_EMPTY option is set then check, if 918b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * all bytes except the pattern area contain 0xff. 928b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris */ 93e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhousestatic int check_pattern(uint8_t *buf, int len, int paglen, struct nand_bbt_descr *td) 941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 95171650af9cd847964cf69b6bab9009631283293fArtem B. Bityuckiy int i, end = 0; 961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds uint8_t *p = buf; 971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 987cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior if (td->options & NAND_BBT_NO_OOB) 997cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior return check_pattern_no_oob(buf, td); 1007cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior 101c9e0536523f5191395d62f6c84d007e6ffd38d33Thomas Gleixner end = paglen + td->offs; 1021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (td->options & NAND_BBT_SCANEMPTY) { 1031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (i = 0; i < end; i++) { 1041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (p[i] != 0xff) 1051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -1; 1061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 10761b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner } 108c9e0536523f5191395d62f6c84d007e6ffd38d33Thomas Gleixner p += end; 10961b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner 1101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Compare the pattern */ 11175b66d8ccd5772b00a7328c2cf75bc506ec532a1Brian Norris if (memcmp(p, td->pattern, td->len)) 11275b66d8ccd5772b00a7328c2cf75bc506ec532a1Brian Norris return -1; 11358373ff0afff4cc8ac40608872995f4d87eb72ecBrian Norris 1141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (td->options & NAND_BBT_SCANEMPTY) { 115171650af9cd847964cf69b6bab9009631283293fArtem B. Bityuckiy p += td->len; 116171650af9cd847964cf69b6bab9009631283293fArtem B. Bityuckiy end += td->len; 1171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (i = end; i < len; i++) { 1181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (*p++ != 0xff) 1191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -1; 1201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 1211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 1221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 1231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12561b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner/** 126c9e0536523f5191395d62f6c84d007e6ffd38d33Thomas Gleixner * check_short_pattern - [GENERIC] check if a pattern is in the buffer 1278b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @buf: the buffer to search 1288b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @td: search pattern descriptor 129c9e0536523f5191395d62f6c84d007e6ffd38d33Thomas Gleixner * 1308b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * Check for a pattern at the given place. Used to search bad block tables and 1318b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * good / bad block identifiers. Same as check_pattern, but no optional empty 1328b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * check. 1338b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris */ 134e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhousestatic int check_short_pattern(uint8_t *buf, struct nand_bbt_descr *td) 135c9e0536523f5191395d62f6c84d007e6ffd38d33Thomas Gleixner{ 136c9e0536523f5191395d62f6c84d007e6ffd38d33Thomas Gleixner int i; 137c9e0536523f5191395d62f6c84d007e6ffd38d33Thomas Gleixner uint8_t *p = buf; 138c9e0536523f5191395d62f6c84d007e6ffd38d33Thomas Gleixner 139c9e0536523f5191395d62f6c84d007e6ffd38d33Thomas Gleixner /* Compare the pattern */ 140c9e0536523f5191395d62f6c84d007e6ffd38d33Thomas Gleixner for (i = 0; i < td->len; i++) { 14119870da7ea2fc483bf73a189046a430fd9b01391Thomas Gleixner if (p[td->offs + i] != td->pattern[i]) 142c9e0536523f5191395d62f6c84d007e6ffd38d33Thomas Gleixner return -1; 143c9e0536523f5191395d62f6c84d007e6ffd38d33Thomas Gleixner } 144c9e0536523f5191395d62f6c84d007e6ffd38d33Thomas Gleixner return 0; 145c9e0536523f5191395d62f6c84d007e6ffd38d33Thomas Gleixner} 146c9e0536523f5191395d62f6c84d007e6ffd38d33Thomas Gleixner 1471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/** 1487cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior * add_marker_len - compute the length of the marker in data area 1498b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @td: BBT descriptor used for computation 1507cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior * 1517854d3f7495b11be1570cd3e2318674d8f9ed797Brian Norris * The length will be 0 if the marker is located in OOB area. 1527cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior */ 1537cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewiorstatic u32 add_marker_len(struct nand_bbt_descr *td) 1547cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior{ 1557cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior u32 len; 1567cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior 1577cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior if (!(td->options & NAND_BBT_NO_OOB)) 1587cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior return 0; 1597cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior 1607cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior len = td->len; 1617cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior if (td->options & NAND_BBT_VERSION) 1627cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior len++; 1637cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior return len; 1647cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior} 1657cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior 1667cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior/** 1671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * read_bbt - [GENERIC] Read the bad block table starting from page 1688b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @mtd: MTD device structure 1698b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @buf: temporary buffer 1708b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @page: the starting page 1718b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @num: the number of bbt descriptors to read 1727854d3f7495b11be1570cd3e2318674d8f9ed797Brian Norris * @td: the bbt describtion table 1738b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @offs: offset in the memory table 1741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 1751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Read the bad block table starting from page. 1761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 177e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhousestatic int read_bbt(struct mtd_info *mtd, uint8_t *buf, int page, int num, 178df5b4e343c52fcdc54db3f9d07068c98cda6007bSebastian Andrzej Siewior struct nand_bbt_descr *td, int offs) 1791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 180167a8d52509a0f7d6728a79e2588b800e866c147Brian Norris int res, ret = 0, i, j, act = 0; 1811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct nand_chip *this = mtd->priv; 1821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size_t retlen, len, totlen; 1831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds loff_t from; 184df5b4e343c52fcdc54db3f9d07068c98cda6007bSebastian Andrzej Siewior int bits = td->options & NAND_BBT_NRBITS_MSK; 185596d74527a804418d88e1178c9d72aff5649e89cBrian Norris uint8_t msk = (uint8_t)((1 << bits) - 1); 1867cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior u32 marker_len; 187df5b4e343c52fcdc54db3f9d07068c98cda6007bSebastian Andrzej Siewior int reserved_block_code = td->reserved_block_code; 1881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds totlen = (num * bits) >> 3; 1907cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior marker_len = add_marker_len(td); 191596d74527a804418d88e1178c9d72aff5649e89cBrian Norris from = ((loff_t)page) << this->page_shift; 19261b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner 1931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds while (totlen) { 194596d74527a804418d88e1178c9d72aff5649e89cBrian Norris len = min(totlen, (size_t)(1 << this->bbt_erase_shift)); 1957cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior if (marker_len) { 1967cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior /* 1977cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior * In case the BBT marker is not in the OOB area it 1987cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior * will be just in the first page. 1997cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior */ 2007cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior len -= marker_len; 2017cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior from += marker_len; 2027cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior marker_len = 0; 2037cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior } 204329ad399a9b3adf52c90637b21ca029fcf7f8795Artem Bityutskiy res = mtd_read(mtd, from, len, &retlen, buf); 2051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (res < 0) { 206167a8d52509a0f7d6728a79e2588b800e866c147Brian Norris if (mtd_is_eccerr(res)) { 207167a8d52509a0f7d6728a79e2588b800e866c147Brian Norris pr_info("nand_bbt: ECC error in BBT at " 208167a8d52509a0f7d6728a79e2588b800e866c147Brian Norris "0x%012llx\n", from & ~mtd->writesize); 209167a8d52509a0f7d6728a79e2588b800e866c147Brian Norris return res; 210167a8d52509a0f7d6728a79e2588b800e866c147Brian Norris } else if (mtd_is_bitflip(res)) { 211167a8d52509a0f7d6728a79e2588b800e866c147Brian Norris pr_info("nand_bbt: corrected error in BBT at " 212167a8d52509a0f7d6728a79e2588b800e866c147Brian Norris "0x%012llx\n", from & ~mtd->writesize); 213167a8d52509a0f7d6728a79e2588b800e866c147Brian Norris ret = res; 214167a8d52509a0f7d6728a79e2588b800e866c147Brian Norris } else { 215167a8d52509a0f7d6728a79e2588b800e866c147Brian Norris pr_info("nand_bbt: error reading BBT\n"); 2161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return res; 2171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 21861b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner } 2191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Analyse data */ 2211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (i = 0; i < len; i++) { 2221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds uint8_t dat = buf[i]; 2231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (j = 0; j < 8; j += bits, act += 2) { 2241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds uint8_t tmp = (dat >> j) & msk; 2251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (tmp == msk) 2261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds continue; 227e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse if (reserved_block_code && (tmp == reserved_block_code)) { 228d037021953922ebdbc34b98b8c4648017b1c6e89Brian Norris pr_info("nand_read_bbt: reserved block at 0x%012llx\n", 229d037021953922ebdbc34b98b8c4648017b1c6e89Brian Norris (loff_t)((offs << 2) + (act >> 1)) << this->bbt_erase_shift); 2301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds this->bbt[offs + (act >> 3)] |= 0x2 << (act & 0x06); 231f1a28c02843efcfcc41982149880bac3ac180234Thomas Gleixner mtd->ecc_stats.bbtblocks++; 2321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds continue; 2331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 2348b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris /* 2358b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * Leave it for now, if it's matured we can 236a0f5080ecc1c75f9c08591d9b0f48451e7ac8ddcBrian Norris * move this message to pr_debug. 2378b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris */ 238d037021953922ebdbc34b98b8c4648017b1c6e89Brian Norris pr_info("nand_read_bbt: bad block at 0x%012llx\n", 239d037021953922ebdbc34b98b8c4648017b1c6e89Brian Norris (loff_t)((offs << 2) + (act >> 1)) << this->bbt_erase_shift); 2408b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris /* Factory marked bad or worn out? */ 2411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (tmp == 0) 2421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds this->bbt[offs + (act >> 3)] |= 0x3 << (act & 0x06); 2431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds else 2441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds this->bbt[offs + (act >> 3)] |= 0x1 << (act & 0x06); 245f1a28c02843efcfcc41982149880bac3ac180234Thomas Gleixner mtd->ecc_stats.badblocks++; 24661b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner } 2471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 2481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds totlen -= len; 2491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds from += len; 2501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 251167a8d52509a0f7d6728a79e2588b800e866c147Brian Norris return ret; 2521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/** 2551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * read_abs_bbt - [GENERIC] Read the bad block table starting at a given page 2568b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @mtd: MTD device structure 2578b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @buf: temporary buffer 2588b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @td: descriptor for the bad block table 259596d74527a804418d88e1178c9d72aff5649e89cBrian Norris * @chip: read the table for a specific chip, -1 read all chips; applies only if 2608b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * NAND_BBT_PERCHIP option is set 2611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 2628b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * Read the bad block table for all chips starting at a given page. We assume 2638b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * that the bbt bits are in consecutive order. 2648b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris */ 265e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhousestatic int read_abs_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td, int chip) 2661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct nand_chip *this = mtd->priv; 2681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int res = 0, i; 2691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (td->options & NAND_BBT_PERCHIP) { 2711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int offs = 0; 2721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (i = 0; i < this->numchips; i++) { 2731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (chip == -1 || chip == i) 274df5b4e343c52fcdc54db3f9d07068c98cda6007bSebastian Andrzej Siewior res = read_bbt(mtd, buf, td->pages[i], 275df5b4e343c52fcdc54db3f9d07068c98cda6007bSebastian Andrzej Siewior this->chipsize >> this->bbt_erase_shift, 276df5b4e343c52fcdc54db3f9d07068c98cda6007bSebastian Andrzej Siewior td, offs); 2771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (res) 2781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return res; 2791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds offs += this->chipsize >> (this->bbt_erase_shift + 2); 2801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 2811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 282df5b4e343c52fcdc54db3f9d07068c98cda6007bSebastian Andrzej Siewior res = read_bbt(mtd, buf, td->pages[0], 283df5b4e343c52fcdc54db3f9d07068c98cda6007bSebastian Andrzej Siewior mtd->size >> this->bbt_erase_shift, td, 0); 2841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (res) 2851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return res; 2861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 2871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 2881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2908b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris/* BBT marker is in the first page, no OOB */ 2917cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewiorstatic int scan_read_raw_data(struct mtd_info *mtd, uint8_t *buf, loff_t offs, 2927cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior struct nand_bbt_descr *td) 2937cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior{ 2947cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior size_t retlen; 2957cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior size_t len; 2967cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior 2977cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior len = td->len; 2987cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior if (td->options & NAND_BBT_VERSION) 2997cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior len++; 3007cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior 301329ad399a9b3adf52c90637b21ca029fcf7f8795Artem Bityutskiy return mtd_read(mtd, offs, len, &retlen, buf); 3027cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior} 3037cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior 3048b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris/* Scan read raw data from flash */ 3057cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewiorstatic int scan_read_raw_oob(struct mtd_info *mtd, uint8_t *buf, loff_t offs, 3068593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner size_t len) 3078593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner{ 3088593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner struct mtd_oob_ops ops; 309b64d39d8b03fea88417d53715ccbebf71d4dcc9fMaxim Levitsky int res; 3108593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner 3110612b9ddc2eeda014dd805c87c752b342d8f80f0Brian Norris ops.mode = MTD_OPS_RAW; 3128593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner ops.ooboffs = 0; 3138593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner ops.ooblen = mtd->oobsize; 3148593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner 315b64d39d8b03fea88417d53715ccbebf71d4dcc9fMaxim Levitsky while (len > 0) { 316105513cc4a25522f959788371bd612f987d4d184Brian Norris ops.datbuf = buf; 317105513cc4a25522f959788371bd612f987d4d184Brian Norris ops.len = min(len, (size_t)mtd->writesize); 318105513cc4a25522f959788371bd612f987d4d184Brian Norris ops.oobbuf = buf + ops.len; 319b64d39d8b03fea88417d53715ccbebf71d4dcc9fMaxim Levitsky 320fd2819bbc92fc98bed5d612e4acbe16b6326f6bfArtem Bityutskiy res = mtd_read_oob(mtd, offs, &ops); 321b64d39d8b03fea88417d53715ccbebf71d4dcc9fMaxim Levitsky 322afa17de262633603dd65f89e9370f48e56b8c557Brian Norris if (res) 323105513cc4a25522f959788371bd612f987d4d184Brian Norris return res; 324b64d39d8b03fea88417d53715ccbebf71d4dcc9fMaxim Levitsky 325b64d39d8b03fea88417d53715ccbebf71d4dcc9fMaxim Levitsky buf += mtd->oobsize + mtd->writesize; 326b64d39d8b03fea88417d53715ccbebf71d4dcc9fMaxim Levitsky len -= mtd->writesize; 327a5b57cd820528f863d519ac5a0f6a94e5e8b3a0eDmitry Maluka offs += mtd->writesize; 328b64d39d8b03fea88417d53715ccbebf71d4dcc9fMaxim Levitsky } 329b64d39d8b03fea88417d53715ccbebf71d4dcc9fMaxim Levitsky return 0; 3308593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner} 3318593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner 3327cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewiorstatic int scan_read_raw(struct mtd_info *mtd, uint8_t *buf, loff_t offs, 3337cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior size_t len, struct nand_bbt_descr *td) 3347cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior{ 3357cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior if (td->options & NAND_BBT_NO_OOB) 3367cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior return scan_read_raw_data(mtd, buf, offs, td); 3377cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior else 3387cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior return scan_read_raw_oob(mtd, buf, offs, len); 3397cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior} 3407cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior 3418b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris/* Scan write data with oob to flash */ 3428593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixnerstatic int scan_write_bbt(struct mtd_info *mtd, loff_t offs, size_t len, 3438593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner uint8_t *buf, uint8_t *oob) 3448593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner{ 3458593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner struct mtd_oob_ops ops; 3468593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner 3470612b9ddc2eeda014dd805c87c752b342d8f80f0Brian Norris ops.mode = MTD_OPS_PLACE_OOB; 3488593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner ops.ooboffs = 0; 3498593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner ops.ooblen = mtd->oobsize; 3508593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner ops.datbuf = buf; 3518593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner ops.oobbuf = oob; 3528593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner ops.len = len; 3538593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner 354a2cc5ba075f9bc837d0b4d4ec7328dcefc11859dArtem Bityutskiy return mtd_write_oob(mtd, offs, &ops); 3558593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner} 3568593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner 3577cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewiorstatic u32 bbt_get_ver_offs(struct mtd_info *mtd, struct nand_bbt_descr *td) 3587cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior{ 3597cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior u32 ver_offs = td->veroffs; 3607cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior 3617cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior if (!(td->options & NAND_BBT_NO_OOB)) 3627cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior ver_offs += mtd->writesize; 3637cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior return ver_offs; 3647cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior} 3657cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior 3661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/** 3671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * read_abs_bbts - [GENERIC] Read the bad block table(s) for all chips starting at a given page 3688b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @mtd: MTD device structure 3698b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @buf: temporary buffer 3708b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @td: descriptor for the bad block table 3718b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @md: descriptor for the bad block table mirror 3721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 3738b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * Read the bad block table(s) for all chips starting at a given page. We 3748b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * assume that the bbt bits are in consecutive order. 3758b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris */ 3768593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixnerstatic int read_abs_bbts(struct mtd_info *mtd, uint8_t *buf, 3778593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner struct nand_bbt_descr *td, struct nand_bbt_descr *md) 3781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 3791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct nand_chip *this = mtd->priv; 3801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 38161b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner /* Read the primary version, if available */ 3821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (td->options & NAND_BBT_VERSION) { 38369423d99fc182a81f3c5db3eb5c140acc6fc64beAdrian Hunter scan_read_raw(mtd, buf, (loff_t)td->pages[0] << this->page_shift, 3847cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior mtd->writesize, td); 3857cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior td->version[0] = buf[bbt_get_ver_offs(mtd, td)]; 3869a4d4d69018e7b719ba58fa30fcdd60e547776b8Brian Norris pr_info("Bad block table at page %d, version 0x%02X\n", 387d037021953922ebdbc34b98b8c4648017b1c6e89Brian Norris td->pages[0], td->version[0]); 3881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 39061b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner /* Read the mirror version, if available */ 3911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (md && (md->options & NAND_BBT_VERSION)) { 39269423d99fc182a81f3c5db3eb5c140acc6fc64beAdrian Hunter scan_read_raw(mtd, buf, (loff_t)md->pages[0] << this->page_shift, 3937cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior mtd->writesize, td); 3947cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior md->version[0] = buf[bbt_get_ver_offs(mtd, md)]; 3959a4d4d69018e7b719ba58fa30fcdd60e547776b8Brian Norris pr_info("Bad block table at page %d, version 0x%02X\n", 396d037021953922ebdbc34b98b8c4648017b1c6e89Brian Norris md->pages[0], md->version[0]); 3971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 1; 3991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 4001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4018b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris/* Scan a given block full */ 4028593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixnerstatic int scan_block_full(struct mtd_info *mtd, struct nand_bbt_descr *bd, 4038593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner loff_t offs, uint8_t *buf, size_t readlen, 4048593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner int scanlen, int len) 4058593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner{ 4068593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner int ret, j; 4078593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner 4087cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior ret = scan_read_raw_oob(mtd, buf, offs, readlen); 409afa17de262633603dd65f89e9370f48e56b8c557Brian Norris /* Ignore ECC errors when checking for BBM */ 410d57f40544a41fdfe90fd863b6865138c5a82f1ccBrian Norris if (ret && !mtd_is_bitflip_or_eccerr(ret)) 4118593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner return ret; 4128593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner 4138593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner for (j = 0; j < len; j++, buf += scanlen) { 4148593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner if (check_pattern(buf, scanlen, mtd->writesize, bd)) 4158593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner return 1; 4168593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner } 4178593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner return 0; 4188593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner} 4198593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner 4208b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris/* Scan a given block partially */ 4218593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixnerstatic int scan_block_fast(struct mtd_info *mtd, struct nand_bbt_descr *bd, 4228593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner loff_t offs, uint8_t *buf, int len) 4238593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner{ 4248593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner struct mtd_oob_ops ops; 4258593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner int j, ret; 4268593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner 4278593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner ops.ooblen = mtd->oobsize; 4288593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner ops.oobbuf = buf; 4298593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner ops.ooboffs = 0; 4308593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner ops.datbuf = NULL; 4310612b9ddc2eeda014dd805c87c752b342d8f80f0Brian Norris ops.mode = MTD_OPS_PLACE_OOB; 4328593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner 4338593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner for (j = 0; j < len; j++) { 4348593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner /* 4358b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * Read the full oob until read_oob is fixed to handle single 4368b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * byte reads for 16 bit buswidth. 4378593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner */ 438fd2819bbc92fc98bed5d612e4acbe16b6326f6bfArtem Bityutskiy ret = mtd_read_oob(mtd, offs, &ops); 439903cd06cd6ece7f9050a3ad5b03e0b76be2882ffBrian Norris /* Ignore ECC errors when checking for BBM */ 440d57f40544a41fdfe90fd863b6865138c5a82f1ccBrian Norris if (ret && !mtd_is_bitflip_or_eccerr(ret)) 4418593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner return ret; 4428593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner 4438593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner if (check_short_pattern(buf, bd)) 4448593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner return 1; 4458593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner 4468593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner offs += mtd->writesize; 4478593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner } 4488593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner return 0; 4498593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner} 4508593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner 4511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/** 4521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * create_bbt - [GENERIC] Create a bad block table by scanning the device 4538b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @mtd: MTD device structure 4548b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @buf: temporary buffer 4558b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @bd: descriptor for the good/bad block search pattern 4568b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @chip: create the table for a specific chip, -1 read all chips; applies only 4578b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * if NAND_BBT_PERCHIP option is set 4581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 4598b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * Create a bad block table by scanning the device for the given good/bad block 4608b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * identify pattern. 4611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 4628593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixnerstatic int create_bbt(struct mtd_info *mtd, uint8_t *buf, 4638593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner struct nand_bbt_descr *bd, int chip) 4641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 4651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct nand_chip *this = mtd->priv; 4668593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner int i, numblocks, len, scanlen; 4671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int startblock; 4681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds loff_t from; 4698593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner size_t readlen; 4701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4719a4d4d69018e7b719ba58fa30fcdd60e547776b8Brian Norris pr_info("Scanning device for bad blocks\n"); 4721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (bd->options & NAND_BBT_SCANALLPAGES) 4741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds len = 1 << (this->bbt_erase_shift - this->page_shift); 47558373ff0afff4cc8ac40608872995f4d87eb72ecBrian Norris else if (bd->options & NAND_BBT_SCAN2NDPAGE) 47658373ff0afff4cc8ac40608872995f4d87eb72ecBrian Norris len = 2; 47758373ff0afff4cc8ac40608872995f4d87eb72ecBrian Norris else 47858373ff0afff4cc8ac40608872995f4d87eb72ecBrian Norris len = 1; 479171650af9cd847964cf69b6bab9009631283293fArtem B. Bityuckiy 480171650af9cd847964cf69b6bab9009631283293fArtem B. Bityuckiy if (!(bd->options & NAND_BBT_SCANEMPTY)) { 481171650af9cd847964cf69b6bab9009631283293fArtem B. Bityuckiy /* We need only read few bytes from the OOB area */ 4828593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner scanlen = 0; 483eeada24da8bd23fcf6acd2729be054ea99b301bbArtem B. Bityuckiy readlen = bd->len; 484eeada24da8bd23fcf6acd2729be054ea99b301bbArtem B. Bityuckiy } else { 485171650af9cd847964cf69b6bab9009631283293fArtem B. Bityuckiy /* Full page content should be read */ 48628318776a80bc3261f9af91ef79e6e38bb9f5becJoern Engel scanlen = mtd->writesize + mtd->oobsize; 48728318776a80bc3261f9af91ef79e6e38bb9f5becJoern Engel readlen = len * mtd->writesize; 488eeada24da8bd23fcf6acd2729be054ea99b301bbArtem B. Bityuckiy } 4891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (chip == -1) { 4918b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris /* 4928b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * Note that numblocks is 2 * (real numblocks) here, see i+=2 4938b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * below as it makes shifting and masking less painful 4948b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris */ 4951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds numblocks = mtd->size >> (this->bbt_erase_shift - 1); 4961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds startblock = 0; 4971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds from = 0; 4981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 4991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (chip >= this->numchips) { 5009a4d4d69018e7b719ba58fa30fcdd60e547776b8Brian Norris pr_warn("create_bbt(): chipnr (%d) > available chips (%d)\n", 501e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse chip + 1, this->numchips); 502171650af9cd847964cf69b6bab9009631283293fArtem B. Bityuckiy return -EINVAL; 5031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds numblocks = this->chipsize >> (this->bbt_erase_shift - 1); 5051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds startblock = chip * numblocks; 5061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds numblocks += startblock; 50769423d99fc182a81f3c5db3eb5c140acc6fc64beAdrian Hunter from = (loff_t)startblock << (this->bbt_erase_shift - 1); 5081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 50961b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner 5105fb1549dfc40f3b589dae560ea21535cdc5f64e0Brian Norris if (this->bbt_options & NAND_BBT_SCANLASTPAGE) 511b60b08b02ca8d9575985ae6711bd656dd67e9039Kevin Cernekee from += mtd->erasesize - (mtd->writesize * len); 512b60b08b02ca8d9575985ae6711bd656dd67e9039Kevin Cernekee 5131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (i = startblock; i < numblocks;) { 514eeada24da8bd23fcf6acd2729be054ea99b301bbArtem B. Bityuckiy int ret; 51561b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner 5167cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior BUG_ON(bd->options & NAND_BBT_NO_OOB); 5177cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior 5188593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner if (bd->options & NAND_BBT_SCANALLPAGES) 5198593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner ret = scan_block_full(mtd, bd, from, buf, readlen, 5208593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner scanlen, len); 5218593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner else 5228593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner ret = scan_block_fast(mtd, bd, from, buf, len); 5238593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner 5248593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner if (ret < 0) 5258593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner return ret; 5268593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner 5278593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner if (ret) { 5288593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner this->bbt[i >> 3] |= 0x03 << (i & 0x6); 5299a4d4d69018e7b719ba58fa30fcdd60e547776b8Brian Norris pr_warn("Bad eraseblock %d at 0x%012llx\n", 530d037021953922ebdbc34b98b8c4648017b1c6e89Brian Norris i >> 1, (unsigned long long)from); 531f1a28c02843efcfcc41982149880bac3ac180234Thomas Gleixner mtd->ecc_stats.badblocks++; 5321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5338593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner 5341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i += 2; 5351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds from += (1 << this->bbt_erase_shift); 5361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 537eeada24da8bd23fcf6acd2729be054ea99b301bbArtem B. Bityuckiy return 0; 5381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 5391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/** 5411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * search_bbt - [GENERIC] scan the device for a specific bad block table 5428b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @mtd: MTD device structure 5438b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @buf: temporary buffer 5448b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @td: descriptor for the bad block table 5451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 5468b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * Read the bad block table by searching for a given ident pattern. Search is 5478b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * preformed either from the beginning up or from the end of the device 5488b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * downwards. The search starts always at the start of a block. If the option 5498b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * NAND_BBT_PERCHIP is given, each chip is searched for a bbt, which contains 5508b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * the bad block information of this chip. This is necessary to provide support 5518b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * for certain DOC devices. 5521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 5538b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * The bbt ident pattern resides in the oob area of the first page in a block. 5541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 555e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhousestatic int search_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td) 5561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 5571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct nand_chip *this = mtd->priv; 5581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int i, chips; 5591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int bits, startblock, block, dir; 56028318776a80bc3261f9af91ef79e6e38bb9f5becJoern Engel int scanlen = mtd->writesize + mtd->oobsize; 5611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int bbtblocks; 5628593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner int blocktopage = this->bbt_erase_shift - this->page_shift; 5631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5648b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris /* Search direction top -> down? */ 5651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (td->options & NAND_BBT_LASTBLOCK) { 566e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse startblock = (mtd->size >> this->bbt_erase_shift) - 1; 5671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dir = -1; 5681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 56961b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner startblock = 0; 5701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dir = 1; 57161b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner } 57261b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner 5738b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris /* Do we have a bbt per chip? */ 5741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (td->options & NAND_BBT_PERCHIP) { 5751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds chips = this->numchips; 5761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds bbtblocks = this->chipsize >> this->bbt_erase_shift; 5771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds startblock &= bbtblocks - 1; 5781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 5791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds chips = 1; 5801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds bbtblocks = mtd->size >> this->bbt_erase_shift; 5811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 58261b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner 5831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Number of bits for each erase block in the bbt */ 5841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds bits = td->options & NAND_BBT_NRBITS_MSK; 58561b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner 5861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (i = 0; i < chips; i++) { 5871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Reset version information */ 58861b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner td->version[i] = 0; 5891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds td->pages[i] = -1; 5901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Scan the maximum number of blocks */ 5911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (block = 0; block < td->maxblocks; block++) { 5928593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner 5931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int actblock = startblock + dir * block; 59469423d99fc182a81f3c5db3eb5c140acc6fc64beAdrian Hunter loff_t offs = (loff_t)actblock << this->bbt_erase_shift; 5958593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner 5961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Read first page */ 5977cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior scan_read_raw(mtd, buf, offs, mtd->writesize, td); 59828318776a80bc3261f9af91ef79e6e38bb9f5becJoern Engel if (!check_pattern(buf, scanlen, mtd->writesize, td)) { 5998593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner td->pages[i] = actblock << blocktopage; 6001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (td->options & NAND_BBT_VERSION) { 6017cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior offs = bbt_get_ver_offs(mtd, td); 6027cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior td->version[i] = buf[offs]; 6031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 6041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 6051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 6061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 6071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds startblock += this->chipsize >> this->bbt_erase_shift; 6081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 6091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Check, if we found a bbt for each requested chip */ 6101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (i = 0; i < chips; i++) { 6111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (td->pages[i] == -1) 6129a4d4d69018e7b719ba58fa30fcdd60e547776b8Brian Norris pr_warn("Bad block table not found for chip %d\n", i); 6131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds else 614d037021953922ebdbc34b98b8c4648017b1c6e89Brian Norris pr_info("Bad block table found at page %d, version " 615d037021953922ebdbc34b98b8c4648017b1c6e89Brian Norris "0x%02X\n", td->pages[i], td->version[i]); 6161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 61761b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner return 0; 6181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 6191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/** 6211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * search_read_bbts - [GENERIC] scan the device for bad block table(s) 6228b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @mtd: MTD device structure 6238b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @buf: temporary buffer 6248b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @td: descriptor for the bad block table 6258b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @md: descriptor for the bad block table mirror 6261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 6278b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * Search and read the bad block table(s). 6288b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris */ 629e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhousestatic int search_read_bbts(struct mtd_info *mtd, uint8_t * buf, struct nand_bbt_descr *td, struct nand_bbt_descr *md) 6301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 6311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Search the primary table */ 632e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse search_bbt(mtd, buf, td); 63361b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner 6341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Search the mirror table */ 6351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (md) 636e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse search_bbt(mtd, buf, md); 63761b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner 6381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Force result check */ 63961b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner return 1; 6401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 6411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 64261b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner/** 6431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * write_bbt - [GENERIC] (Re)write the bad block table 6448b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @mtd: MTD device structure 6458b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @buf: temporary buffer 6468b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @td: descriptor for the bad block table 6478b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @md: descriptor for the bad block table mirror 6488b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @chipsel: selector for a specific chip, -1 for all 6491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 6508b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * (Re)write the bad block table. 6518b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris */ 652e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhousestatic int write_bbt(struct mtd_info *mtd, uint8_t *buf, 6539223a456da8ed357bf7e0b128c853e2c8bd54614Thomas Gleixner struct nand_bbt_descr *td, struct nand_bbt_descr *md, 6549223a456da8ed357bf7e0b128c853e2c8bd54614Thomas Gleixner int chipsel) 6551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 6561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct nand_chip *this = mtd->priv; 6571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct erase_info einfo; 6581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int i, j, res, chip = 0; 6591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int bits, startblock, dir, page, offs, numblocks, sft, sftmsk; 6609223a456da8ed357bf7e0b128c853e2c8bd54614Thomas Gleixner int nrchips, bbtoffs, pageoffs, ooboffs; 6611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds uint8_t msk[4]; 6621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds uint8_t rcode = td->reserved_block_code; 6638593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner size_t retlen, len = 0; 6641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds loff_t to; 6658593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner struct mtd_oob_ops ops; 6668593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner 6678593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner ops.ooblen = mtd->oobsize; 6688593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner ops.ooboffs = 0; 6698593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner ops.datbuf = NULL; 6700612b9ddc2eeda014dd805c87c752b342d8f80f0Brian Norris ops.mode = MTD_OPS_PLACE_OOB; 6711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!rcode) 6731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rcode = 0xff; 6748b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris /* Write bad block table per chip rather than per device? */ 6751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (td->options & NAND_BBT_PERCHIP) { 676e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse numblocks = (int)(this->chipsize >> this->bbt_erase_shift); 6778b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris /* Full device write or specific chip? */ 6781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (chipsel == -1) { 6791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds nrchips = this->numchips; 6801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 6811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds nrchips = chipsel + 1; 6821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds chip = chipsel; 6831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 6841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 685e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse numblocks = (int)(mtd->size >> this->bbt_erase_shift); 6861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds nrchips = 1; 68761b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner } 68861b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner 6891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Loop through the chips */ 6901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (; chip < nrchips; chip++) { 6918b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris /* 6928b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * There was already a version of the table, reuse the page 69361b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner * This applies for absolute placement too, as we have the 6941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * page nr. in td->pages. 6951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 6961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (td->pages[chip] != -1) { 6971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds page = td->pages[chip]; 6981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto write; 69961b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner } 7001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7018b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris /* 7028b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * Automatic placement of the bad block table. Search direction 7038b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * top -> down? 7048b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris */ 7051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (td->options & NAND_BBT_LASTBLOCK) { 7061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds startblock = numblocks * (chip + 1) - 1; 7071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dir = -1; 7081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 7091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds startblock = chip * numblocks; 7101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dir = 1; 71161b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner } 7121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (i = 0; i < td->maxblocks; i++) { 7141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int block = startblock + dir * i; 7151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Check, if the block is bad */ 7169223a456da8ed357bf7e0b128c853e2c8bd54614Thomas Gleixner switch ((this->bbt[block >> 2] >> 7179223a456da8ed357bf7e0b128c853e2c8bd54614Thomas Gleixner (2 * (block & 0x03))) & 0x03) { 7181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case 0x01: 7191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case 0x03: 7201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds continue; 7211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 7229223a456da8ed357bf7e0b128c853e2c8bd54614Thomas Gleixner page = block << 7239223a456da8ed357bf7e0b128c853e2c8bd54614Thomas Gleixner (this->bbt_erase_shift - this->page_shift); 7241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Check, if the block is used by the mirror table */ 7251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!md || md->pages[chip] != page) 7261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto write; 7271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 7289a4d4d69018e7b719ba58fa30fcdd60e547776b8Brian Norris pr_err("No space left to write bad block table\n"); 7291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -ENOSPC; 730e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse write: 7311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Set up shift count and masks for the flash table */ 7331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds bits = td->options & NAND_BBT_NRBITS_MSK; 7349223a456da8ed357bf7e0b128c853e2c8bd54614Thomas Gleixner msk[2] = ~rcode; 7351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds switch (bits) { 7369223a456da8ed357bf7e0b128c853e2c8bd54614Thomas Gleixner case 1: sft = 3; sftmsk = 0x07; msk[0] = 0x00; msk[1] = 0x01; 7379223a456da8ed357bf7e0b128c853e2c8bd54614Thomas Gleixner msk[3] = 0x01; 7389223a456da8ed357bf7e0b128c853e2c8bd54614Thomas Gleixner break; 7399223a456da8ed357bf7e0b128c853e2c8bd54614Thomas Gleixner case 2: sft = 2; sftmsk = 0x06; msk[0] = 0x00; msk[1] = 0x01; 7409223a456da8ed357bf7e0b128c853e2c8bd54614Thomas Gleixner msk[3] = 0x03; 7419223a456da8ed357bf7e0b128c853e2c8bd54614Thomas Gleixner break; 7429223a456da8ed357bf7e0b128c853e2c8bd54614Thomas Gleixner case 4: sft = 1; sftmsk = 0x04; msk[0] = 0x00; msk[1] = 0x0C; 7439223a456da8ed357bf7e0b128c853e2c8bd54614Thomas Gleixner msk[3] = 0x0f; 7449223a456da8ed357bf7e0b128c853e2c8bd54614Thomas Gleixner break; 7459223a456da8ed357bf7e0b128c853e2c8bd54614Thomas Gleixner case 8: sft = 0; sftmsk = 0x00; msk[0] = 0x00; msk[1] = 0x0F; 7469223a456da8ed357bf7e0b128c853e2c8bd54614Thomas Gleixner msk[3] = 0xff; 7479223a456da8ed357bf7e0b128c853e2c8bd54614Thomas Gleixner break; 7481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds default: return -EINVAL; 7491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 75061b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner 7511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds bbtoffs = chip * (numblocks >> 2); 75261b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner 753596d74527a804418d88e1178c9d72aff5649e89cBrian Norris to = ((loff_t)page) << this->page_shift; 7541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7558b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris /* Must we save the block contents? */ 7561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (td->options & NAND_BBT_SAVECONTENT) { 7571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Make it block aligned */ 758596d74527a804418d88e1178c9d72aff5649e89cBrian Norris to &= ~((loff_t)((1 << this->bbt_erase_shift) - 1)); 7591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds len = 1 << this->bbt_erase_shift; 760329ad399a9b3adf52c90637b21ca029fcf7f8795Artem Bityutskiy res = mtd_read(mtd, to, len, &retlen, buf); 7611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (res < 0) { 7621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (retlen != len) { 763d037021953922ebdbc34b98b8c4648017b1c6e89Brian Norris pr_info("nand_bbt: error reading block " 764d037021953922ebdbc34b98b8c4648017b1c6e89Brian Norris "for writing the bad block table\n"); 7651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return res; 7661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 767d037021953922ebdbc34b98b8c4648017b1c6e89Brian Norris pr_warn("nand_bbt: ECC error while reading " 768d037021953922ebdbc34b98b8c4648017b1c6e89Brian Norris "block for writing bad block table\n"); 7691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 7709223a456da8ed357bf7e0b128c853e2c8bd54614Thomas Gleixner /* Read oob data */ 7717014568bad55c20b7ee4f439d78c9e875912d51fVitaly Wool ops.ooblen = (len >> this->page_shift) * mtd->oobsize; 7728593fbc68b0df1168995de76d1af38eb62fd6b62Thomas Gleixner ops.oobbuf = &buf[len]; 773fd2819bbc92fc98bed5d612e4acbe16b6326f6bfArtem Bityutskiy res = mtd_read_oob(mtd, to + mtd->writesize, &ops); 7747014568bad55c20b7ee4f439d78c9e875912d51fVitaly Wool if (res < 0 || ops.oobretlen != ops.ooblen) 7759223a456da8ed357bf7e0b128c853e2c8bd54614Thomas Gleixner goto outerr; 7769223a456da8ed357bf7e0b128c853e2c8bd54614Thomas Gleixner 7771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Calc the byte offset in the buffer */ 7781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pageoffs = page - (int)(to >> this->page_shift); 7791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds offs = pageoffs << this->page_shift; 7801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Preset the bbt area with 0xff */ 781596d74527a804418d88e1178c9d72aff5649e89cBrian Norris memset(&buf[offs], 0xff, (size_t)(numblocks >> sft)); 7829223a456da8ed357bf7e0b128c853e2c8bd54614Thomas Gleixner ooboffs = len + (pageoffs * mtd->oobsize); 7839223a456da8ed357bf7e0b128c853e2c8bd54614Thomas Gleixner 7847cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior } else if (td->options & NAND_BBT_NO_OOB) { 7857cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior ooboffs = 0; 7867cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior offs = td->len; 7878b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris /* The version byte */ 7887cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior if (td->options & NAND_BBT_VERSION) 7897cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior offs++; 7907cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior /* Calc length */ 791596d74527a804418d88e1178c9d72aff5649e89cBrian Norris len = (size_t)(numblocks >> sft); 7927cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior len += offs; 7938b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris /* Make it page aligned! */ 7947cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior len = ALIGN(len, mtd->writesize); 7957cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior /* Preset the buffer with 0xff */ 7967cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior memset(buf, 0xff, len); 7977cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior /* Pattern is located at the begin of first page */ 7987cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior memcpy(buf, td->pattern, td->len); 7991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 8001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Calc length */ 801596d74527a804418d88e1178c9d72aff5649e89cBrian Norris len = (size_t)(numblocks >> sft); 8028b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris /* Make it page aligned! */ 803cda320915db00a07e5c4cdfc79806c3b80c0c7f2Sebastian Andrzej Siewior len = ALIGN(len, mtd->writesize); 8041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Preset the buffer with 0xff */ 8059223a456da8ed357bf7e0b128c853e2c8bd54614Thomas Gleixner memset(buf, 0xff, len + 8069223a456da8ed357bf7e0b128c853e2c8bd54614Thomas Gleixner (len >> this->page_shift)* mtd->oobsize); 8071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds offs = 0; 8089223a456da8ed357bf7e0b128c853e2c8bd54614Thomas Gleixner ooboffs = len; 8091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Pattern is located in oob area of first page */ 8109223a456da8ed357bf7e0b128c853e2c8bd54614Thomas Gleixner memcpy(&buf[ooboffs + td->offs], td->pattern, td->len); 8111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 81261b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner 8139223a456da8ed357bf7e0b128c853e2c8bd54614Thomas Gleixner if (td->options & NAND_BBT_VERSION) 8149223a456da8ed357bf7e0b128c853e2c8bd54614Thomas Gleixner buf[ooboffs + td->veroffs] = td->version[chip]; 8159223a456da8ed357bf7e0b128c853e2c8bd54614Thomas Gleixner 8168b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris /* Walk through the memory table */ 817e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse for (i = 0; i < numblocks;) { 8181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds uint8_t dat; 8191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dat = this->bbt[bbtoffs + (i >> 2)]; 820e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse for (j = 0; j < 4; j++, i++) { 8211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int sftcnt = (i << (3 - sft)) & sftmsk; 8228b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris /* Do not store the reserved bbt blocks! */ 8239223a456da8ed357bf7e0b128c853e2c8bd54614Thomas Gleixner buf[offs + (i >> sft)] &= 8249223a456da8ed357bf7e0b128c853e2c8bd54614Thomas Gleixner ~(msk[dat & 0x03] << sftcnt); 8251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dat >>= 2; 8261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 8271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 82861b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner 829e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse memset(&einfo, 0, sizeof(einfo)); 8301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds einfo.mtd = mtd; 83169423d99fc182a81f3c5db3eb5c140acc6fc64beAdrian Hunter einfo.addr = to; 8321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds einfo.len = 1 << this->bbt_erase_shift; 833e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse res = nand_erase_nand(mtd, &einfo, 1); 8349223a456da8ed357bf7e0b128c853e2c8bd54614Thomas Gleixner if (res < 0) 8359223a456da8ed357bf7e0b128c853e2c8bd54614Thomas Gleixner goto outerr; 83661b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner 8377cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior res = scan_write_bbt(mtd, to, len, buf, 8387cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior td->options & NAND_BBT_NO_OOB ? NULL : 8397cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior &buf[len]); 8409223a456da8ed357bf7e0b128c853e2c8bd54614Thomas Gleixner if (res < 0) 8419223a456da8ed357bf7e0b128c853e2c8bd54614Thomas Gleixner goto outerr; 8429223a456da8ed357bf7e0b128c853e2c8bd54614Thomas Gleixner 843d037021953922ebdbc34b98b8c4648017b1c6e89Brian Norris pr_info("Bad block table written to 0x%012llx, version 0x%02X\n", 844d037021953922ebdbc34b98b8c4648017b1c6e89Brian Norris (unsigned long long)to, td->version[chip]); 84561b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner 8461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Mark it as used */ 8471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds td->pages[chip] = page; 84861b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner } 8491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 8509223a456da8ed357bf7e0b128c853e2c8bd54614Thomas Gleixner 8519223a456da8ed357bf7e0b128c853e2c8bd54614Thomas Gleixner outerr: 852d037021953922ebdbc34b98b8c4648017b1c6e89Brian Norris pr_warn("nand_bbt: error while writing bad block table %d\n", res); 8539223a456da8ed357bf7e0b128c853e2c8bd54614Thomas Gleixner return res; 8541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 8551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/** 8571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * nand_memory_bbt - [GENERIC] create a memory based bad block table 8588b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @mtd: MTD device structure 8598b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @bd: descriptor for the good/bad block search pattern 8601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 8618b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * The function creates a memory based bbt by scanning the device for 8628b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * manufacturer / software marked good / bad blocks. 8638b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris */ 864e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhousestatic inline int nand_memory_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd) 8651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 8661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct nand_chip *this = mtd->priv; 8671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 868171650af9cd847964cf69b6bab9009631283293fArtem B. Bityuckiy bd->options &= ~NAND_BBT_SCANEMPTY; 8694bf63fcb83dc761853f69a77b15e47712689020bDavid Woodhouse return create_bbt(mtd, this->buffers->databuf, bd, -1); 8701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 8711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/** 873e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse * check_create - [GENERIC] create and write bbt(s) if necessary 8748b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @mtd: MTD device structure 8758b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @buf: temporary buffer 8768b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @bd: descriptor for the good/bad block search pattern 8771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 8788b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * The function checks the results of the previous call to read_bbt and creates 8798b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * / updates the bbt(s) if necessary. Creation is necessary if no bbt was found 8808b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * for the chip/device. Update is necessary if one of the tables is missing or 8818b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * the version nr. of one table is less than the other. 8828b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris */ 883e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhousestatic int check_create(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *bd) 8841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 885623978de362a5faeb18d8395fa86089650642626Brian Norris int i, chips, writeops, create, chipsel, res, res2; 8861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct nand_chip *this = mtd->priv; 8871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct nand_bbt_descr *td = this->bbt_td; 8881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct nand_bbt_descr *md = this->bbt_md; 8891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct nand_bbt_descr *rd, *rd2; 8901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8918b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris /* Do we have a bbt per chip? */ 89261b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner if (td->options & NAND_BBT_PERCHIP) 8931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds chips = this->numchips; 89461b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner else 8951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds chips = 1; 89661b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner 8971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (i = 0; i < chips; i++) { 8981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds writeops = 0; 899b61bf5bbf619fc66ca866a27038da0b91cafb92dBrian Norris create = 0; 9001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rd = NULL; 9011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rd2 = NULL; 902623978de362a5faeb18d8395fa86089650642626Brian Norris res = res2 = 0; 9038b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris /* Per chip or per device? */ 9041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds chipsel = (td->options & NAND_BBT_PERCHIP) ? i : -1; 9058b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris /* Mirrored table available? */ 9061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (md) { 9071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (td->pages[i] == -1 && md->pages[i] == -1) { 908b61bf5bbf619fc66ca866a27038da0b91cafb92dBrian Norris create = 1; 9091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds writeops = 0x03; 910c5e8ef9c21a492f1e0436b350bbc3e916f93e506Brian Norris } else if (td->pages[i] == -1) { 91161b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner rd = md; 912596d74527a804418d88e1178c9d72aff5649e89cBrian Norris writeops = 0x01; 913c5e8ef9c21a492f1e0436b350bbc3e916f93e506Brian Norris } else if (md->pages[i] == -1) { 9141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rd = td; 915596d74527a804418d88e1178c9d72aff5649e89cBrian Norris writeops = 0x02; 916c5e8ef9c21a492f1e0436b350bbc3e916f93e506Brian Norris } else if (td->version[i] == md->version[i]) { 9171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rd = td; 9181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!(td->options & NAND_BBT_VERSION)) 9191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rd2 = md; 920c5e8ef9c21a492f1e0436b350bbc3e916f93e506Brian Norris } else if (((int8_t)(td->version[i] - md->version[i])) > 0) { 9211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rd = td; 922596d74527a804418d88e1178c9d72aff5649e89cBrian Norris writeops = 0x02; 9231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 9241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rd = md; 925596d74527a804418d88e1178c9d72aff5649e89cBrian Norris writeops = 0x01; 9261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 9271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 9281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (td->pages[i] == -1) { 929b61bf5bbf619fc66ca866a27038da0b91cafb92dBrian Norris create = 1; 9301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds writeops = 0x01; 931b61bf5bbf619fc66ca866a27038da0b91cafb92dBrian Norris } else { 932b61bf5bbf619fc66ca866a27038da0b91cafb92dBrian Norris rd = td; 9331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 9341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 93561b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner 936b61bf5bbf619fc66ca866a27038da0b91cafb92dBrian Norris if (create) { 937b61bf5bbf619fc66ca866a27038da0b91cafb92dBrian Norris /* Create the bad block table by scanning the device? */ 938b61bf5bbf619fc66ca866a27038da0b91cafb92dBrian Norris if (!(td->options & NAND_BBT_CREATE)) 939b61bf5bbf619fc66ca866a27038da0b91cafb92dBrian Norris continue; 940b61bf5bbf619fc66ca866a27038da0b91cafb92dBrian Norris 941b61bf5bbf619fc66ca866a27038da0b91cafb92dBrian Norris /* Create the table in memory by scanning the chip(s) */ 942b61bf5bbf619fc66ca866a27038da0b91cafb92dBrian Norris if (!(this->bbt_options & NAND_BBT_CREATE_EMPTY)) 943b61bf5bbf619fc66ca866a27038da0b91cafb92dBrian Norris create_bbt(mtd, buf, bd, chipsel); 944b61bf5bbf619fc66ca866a27038da0b91cafb92dBrian Norris 945b61bf5bbf619fc66ca866a27038da0b91cafb92dBrian Norris td->version[i] = 1; 946b61bf5bbf619fc66ca866a27038da0b91cafb92dBrian Norris if (md) 947b61bf5bbf619fc66ca866a27038da0b91cafb92dBrian Norris md->version[i] = 1; 948b61bf5bbf619fc66ca866a27038da0b91cafb92dBrian Norris } 949b61bf5bbf619fc66ca866a27038da0b91cafb92dBrian Norris 9508b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris /* Read back first? */ 951623978de362a5faeb18d8395fa86089650642626Brian Norris if (rd) { 952623978de362a5faeb18d8395fa86089650642626Brian Norris res = read_abs_bbt(mtd, buf, rd, chipsel); 953623978de362a5faeb18d8395fa86089650642626Brian Norris if (mtd_is_eccerr(res)) { 954623978de362a5faeb18d8395fa86089650642626Brian Norris /* Mark table as invalid */ 955623978de362a5faeb18d8395fa86089650642626Brian Norris rd->pages[i] = -1; 956dadc17a3e34810ed411a62e6b4cafdf3e5e1d5c8Brian Norris rd->version[i] = 0; 957623978de362a5faeb18d8395fa86089650642626Brian Norris i--; 958623978de362a5faeb18d8395fa86089650642626Brian Norris continue; 959623978de362a5faeb18d8395fa86089650642626Brian Norris } 960623978de362a5faeb18d8395fa86089650642626Brian Norris } 9618b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris /* If they weren't versioned, read both */ 962623978de362a5faeb18d8395fa86089650642626Brian Norris if (rd2) { 963623978de362a5faeb18d8395fa86089650642626Brian Norris res2 = read_abs_bbt(mtd, buf, rd2, chipsel); 964623978de362a5faeb18d8395fa86089650642626Brian Norris if (mtd_is_eccerr(res2)) { 965623978de362a5faeb18d8395fa86089650642626Brian Norris /* Mark table as invalid */ 966623978de362a5faeb18d8395fa86089650642626Brian Norris rd2->pages[i] = -1; 967dadc17a3e34810ed411a62e6b4cafdf3e5e1d5c8Brian Norris rd2->version[i] = 0; 968623978de362a5faeb18d8395fa86089650642626Brian Norris i--; 969623978de362a5faeb18d8395fa86089650642626Brian Norris continue; 970623978de362a5faeb18d8395fa86089650642626Brian Norris } 971623978de362a5faeb18d8395fa86089650642626Brian Norris } 972623978de362a5faeb18d8395fa86089650642626Brian Norris 973623978de362a5faeb18d8395fa86089650642626Brian Norris /* Scrub the flash table(s)? */ 974623978de362a5faeb18d8395fa86089650642626Brian Norris if (mtd_is_bitflip(res) || mtd_is_bitflip(res2)) 975623978de362a5faeb18d8395fa86089650642626Brian Norris writeops = 0x03; 9761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 977dadc17a3e34810ed411a62e6b4cafdf3e5e1d5c8Brian Norris /* Update version numbers before writing */ 978dadc17a3e34810ed411a62e6b4cafdf3e5e1d5c8Brian Norris if (md) { 979dadc17a3e34810ed411a62e6b4cafdf3e5e1d5c8Brian Norris td->version[i] = max(td->version[i], md->version[i]); 980dadc17a3e34810ed411a62e6b4cafdf3e5e1d5c8Brian Norris md->version[i] = td->version[i]; 981dadc17a3e34810ed411a62e6b4cafdf3e5e1d5c8Brian Norris } 982dadc17a3e34810ed411a62e6b4cafdf3e5e1d5c8Brian Norris 9838b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris /* Write the bad block table to the device? */ 9841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if ((writeops & 0x01) && (td->options & NAND_BBT_WRITE)) { 985e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse res = write_bbt(mtd, buf, td, md, chipsel); 9861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (res < 0) 9871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return res; 9881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 98961b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner 9908b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris /* Write the mirror bad block table to the device? */ 9911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if ((writeops & 0x02) && md && (md->options & NAND_BBT_WRITE)) { 992e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse res = write_bbt(mtd, buf, md, td, chipsel); 9931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (res < 0) 9941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return res; 9951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 9961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 99761b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner return 0; 9981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 9991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/** 100161b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner * mark_bbt_regions - [GENERIC] mark the bad block table regions 10028b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @mtd: MTD device structure 10038b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @td: bad block table descriptor 10041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 10058b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * The bad block table regions are marked as "bad" to prevent accidental 10068b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * erasures / writes. The regions are identified by the mark 0x02. 10078b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris */ 1008e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhousestatic void mark_bbt_region(struct mtd_info *mtd, struct nand_bbt_descr *td) 10091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 10101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct nand_chip *this = mtd->priv; 10111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int i, j, chips, block, nrblocks, update; 10121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds uint8_t oldval, newval; 10131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10148b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris /* Do we have a bbt per chip? */ 10151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (td->options & NAND_BBT_PERCHIP) { 10161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds chips = this->numchips; 10171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds nrblocks = (int)(this->chipsize >> this->bbt_erase_shift); 10181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 10191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds chips = 1; 10201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds nrblocks = (int)(mtd->size >> this->bbt_erase_shift); 102161b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner } 102261b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner 10231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (i = 0; i < chips; i++) { 10241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if ((td->options & NAND_BBT_ABSPAGE) || 10251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds !(td->options & NAND_BBT_WRITE)) { 1026e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse if (td->pages[i] == -1) 1027e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse continue; 10281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds block = td->pages[i] >> (this->bbt_erase_shift - this->page_shift); 102961b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner block <<= 1; 10301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds oldval = this->bbt[(block >> 3)]; 10311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds newval = oldval | (0x2 << (block & 0x06)); 10321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds this->bbt[(block >> 3)] = newval; 10331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if ((oldval != newval) && td->reserved_block_code) 103469423d99fc182a81f3c5db3eb5c140acc6fc64beAdrian Hunter nand_update_bbt(mtd, (loff_t)block << (this->bbt_erase_shift - 1)); 10351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds continue; 10361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 10371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds update = 0; 10381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (td->options & NAND_BBT_LASTBLOCK) 10391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds block = ((i + 1) * nrblocks) - td->maxblocks; 104061b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner else 10411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds block = i * nrblocks; 104261b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner block <<= 1; 10431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (j = 0; j < td->maxblocks; j++) { 10441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds oldval = this->bbt[(block >> 3)]; 10451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds newval = oldval | (0x2 << (block & 0x06)); 10461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds this->bbt[(block >> 3)] = newval; 1047e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse if (oldval != newval) 1048e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse update = 1; 10491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds block += 2; 105061b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner } 10518b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris /* 10528b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * If we want reserved blocks to be recorded to flash, and some 10538b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * new ones have been marked, then we need to update the stored 10548b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * bbts. This should only happen once. 10558b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris */ 10561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (update && td->reserved_block_code) 105769423d99fc182a81f3c5db3eb5c140acc6fc64beAdrian Hunter nand_update_bbt(mtd, (loff_t)(block - 2) << (this->bbt_erase_shift - 1)); 10581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 10591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 10601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/** 10627cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior * verify_bbt_descr - verify the bad block description 10638b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @mtd: MTD device structure 10648b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @bd: the table to verify 10657cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior * 10667cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior * This functions performs a few sanity checks on the bad block description 10677cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior * table. 10687cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior */ 10697cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewiorstatic void verify_bbt_descr(struct mtd_info *mtd, struct nand_bbt_descr *bd) 10707cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior{ 10717cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior struct nand_chip *this = mtd->priv; 10727912a5e7f37512d8d105785046137435b70347ceStanislav Fomichev u32 pattern_len; 10737912a5e7f37512d8d105785046137435b70347ceStanislav Fomichev u32 bits; 10747cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior u32 table_size; 10757cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior 10767cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior if (!bd) 10777cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior return; 10787912a5e7f37512d8d105785046137435b70347ceStanislav Fomichev 10797912a5e7f37512d8d105785046137435b70347ceStanislav Fomichev pattern_len = bd->len; 10807912a5e7f37512d8d105785046137435b70347ceStanislav Fomichev bits = bd->options & NAND_BBT_NRBITS_MSK; 10817912a5e7f37512d8d105785046137435b70347ceStanislav Fomichev 1082a40f73419f02e40555f692785ea1c1813d5b4c12Brian Norris BUG_ON((this->bbt_options & NAND_BBT_NO_OOB) && 1083bb9ebd4e714385a2592a482845865ef2d58b2868Brian Norris !(this->bbt_options & NAND_BBT_USE_FLASH)); 10847cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior BUG_ON(!bits); 10857cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior 10867cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior if (bd->options & NAND_BBT_VERSION) 10877cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior pattern_len++; 10887cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior 10897cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior if (bd->options & NAND_BBT_NO_OOB) { 1090bb9ebd4e714385a2592a482845865ef2d58b2868Brian Norris BUG_ON(!(this->bbt_options & NAND_BBT_USE_FLASH)); 1091a40f73419f02e40555f692785ea1c1813d5b4c12Brian Norris BUG_ON(!(this->bbt_options & NAND_BBT_NO_OOB)); 10927cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior BUG_ON(bd->offs); 10937cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior if (bd->options & NAND_BBT_VERSION) 10947cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior BUG_ON(bd->veroffs != bd->len); 10957cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior BUG_ON(bd->options & NAND_BBT_SAVECONTENT); 10967cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior } 10977cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior 10987cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior if (bd->options & NAND_BBT_PERCHIP) 10997cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior table_size = this->chipsize >> this->bbt_erase_shift; 11007cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior else 11017cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior table_size = mtd->size >> this->bbt_erase_shift; 11027cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior table_size >>= 3; 11037cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior table_size *= bits; 11047cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior if (bd->options & NAND_BBT_NO_OOB) 11057cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior table_size += pattern_len; 11067cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior BUG_ON(table_size > (1 << this->bbt_erase_shift)); 11077cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior} 11087cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior 11097cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior/** 11101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * nand_scan_bbt - [NAND Interface] scan, find, read and maybe create bad block table(s) 11118b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @mtd: MTD device structure 11128b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @bd: descriptor for the good/bad block search pattern 11131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 11148b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * The function checks, if a bad block table(s) is/are already available. If 11158b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * not it scans the device for manufacturer marked good / bad blocks and writes 11168b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * the bad block table(s) to the selected place. 11171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 11188b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * The bad block table memory is allocated here. It must be freed by calling 11198b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * the nand_free_bbt function. 11208b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris */ 1121e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouseint nand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd) 11221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 11231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct nand_chip *this = mtd->priv; 11241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int len, res = 0; 11251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds uint8_t *buf; 11261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct nand_bbt_descr *td = this->bbt_td; 11271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct nand_bbt_descr *md = this->bbt_md; 11281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds len = mtd->size >> (this->bbt_erase_shift + 2); 11308b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris /* 11318b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * Allocate memory (2bit per block) and clear the memory bad block 11328b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * table. 11338b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris */ 113495b93a0cd46682c6d9e8eea803fda510cb6b863aBurman Yan this->bbt = kzalloc(len, GFP_KERNEL); 11350870066d7e6c85bbe37741137e4c4731501a98e0Brian Norris if (!this->bbt) 11361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -ENOMEM; 11371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11388b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris /* 11398b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * If no primary table decriptor is given, scan the device to build a 11408b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * memory based bad block table. 11411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 1142eeada24da8bd23fcf6acd2729be054ea99b301bbArtem B. Bityuckiy if (!td) { 1143eeada24da8bd23fcf6acd2729be054ea99b301bbArtem B. Bityuckiy if ((res = nand_memory_bbt(mtd, bd))) { 1144d037021953922ebdbc34b98b8c4648017b1c6e89Brian Norris pr_err("nand_bbt: can't scan flash and build the RAM-based BBT\n"); 1145e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse kfree(this->bbt); 1146eeada24da8bd23fcf6acd2729be054ea99b301bbArtem B. Bityuckiy this->bbt = NULL; 1147eeada24da8bd23fcf6acd2729be054ea99b301bbArtem B. Bityuckiy } 1148eeada24da8bd23fcf6acd2729be054ea99b301bbArtem B. Bityuckiy return res; 1149eeada24da8bd23fcf6acd2729be054ea99b301bbArtem B. Bityuckiy } 11507cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior verify_bbt_descr(mtd, td); 11517cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior verify_bbt_descr(mtd, md); 11521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Allocate a temporary buffer for one eraseblock incl. oob */ 11541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds len = (1 << this->bbt_erase_shift); 11551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds len += (len >> this->page_shift) * mtd->oobsize; 1156c3f8abf481c2d2b221b028f7369bc6dd39a9590eDavid Woodhouse buf = vmalloc(len); 11571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!buf) { 1158e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse kfree(this->bbt); 11591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds this->bbt = NULL; 11601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -ENOMEM; 11611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 116261b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner 11638b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris /* Is the bbt at a given page? */ 11641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (td->options & NAND_BBT_ABSPAGE) { 1165e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse res = read_abs_bbts(mtd, buf, td, md); 116661b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner } else { 11671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Search the bad block table using a pattern in oob */ 1168e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse res = search_read_bbts(mtd, buf, td, md); 116961b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner } 11701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 117161b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner if (res) 1172e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse res = check_create(mtd, buf, bd); 117361b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner 11741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Prevent the bbt regions from erasing / writing */ 1175e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse mark_bbt_region(mtd, td); 11761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (md) 1177e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse mark_bbt_region(mtd, md); 117861b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner 1179e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse vfree(buf); 11801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return res; 11811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 11821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/** 118461b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner * nand_update_bbt - [NAND Interface] update bad block table(s) 11858b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @mtd: MTD device structure 11868b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @offs: the offset of the newly marked block 11871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 11888b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * The function updates the bad block table(s). 11898b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris */ 1190e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouseint nand_update_bbt(struct mtd_info *mtd, loff_t offs) 11911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 11921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct nand_chip *this = mtd->priv; 11931196ac5a9969f180c67e9a4454384250ab034452Brian Norris int len, res = 0; 11941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int chip, chipsel; 11951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds uint8_t *buf; 11961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct nand_bbt_descr *td = this->bbt_td; 11971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct nand_bbt_descr *md = this->bbt_md; 11981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!this->bbt || !td) 12001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 12011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Allocate a temporary buffer for one eraseblock incl. oob */ 12031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds len = (1 << this->bbt_erase_shift); 12041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds len += (len >> this->page_shift) * mtd->oobsize; 1205e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse buf = kmalloc(len, GFP_KERNEL); 12060870066d7e6c85bbe37741137e4c4731501a98e0Brian Norris if (!buf) 12071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -ENOMEM; 12081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12098b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris /* Do we have a bbt per chip? */ 12101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (td->options & NAND_BBT_PERCHIP) { 1211e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse chip = (int)(offs >> this->chip_shift); 12121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds chipsel = chip; 12131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 12141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds chip = 0; 12151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds chipsel = -1; 12161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 12171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds td->version[chip]++; 12191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (md) 122061b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner md->version[chip]++; 12211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12228b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris /* Write the bad block table to the device? */ 12231196ac5a9969f180c67e9a4454384250ab034452Brian Norris if (td->options & NAND_BBT_WRITE) { 1224e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse res = write_bbt(mtd, buf, td, md, chipsel); 12251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (res < 0) 12261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto out; 12271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 12288b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris /* Write the mirror bad block table to the device? */ 12291196ac5a9969f180c67e9a4454384250ab034452Brian Norris if (md && (md->options & NAND_BBT_WRITE)) { 1230e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse res = write_bbt(mtd, buf, md, td, chipsel); 12311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 12321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1233e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse out: 1234e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse kfree(buf); 12351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return res; 12361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 12371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12388b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris/* 12398b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * Define some generic bad / good block scan pattern which are used 12408b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * while scanning a device for factory marked good / bad blocks. 12418b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris */ 12421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic uint8_t scan_ff_pattern[] = { 0xff, 0xff }; 12431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic uint8_t scan_agand_pattern[] = { 0x1C, 0x71, 0xC7, 0x1C, 0x71, 0xC7 }; 12451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic struct nand_bbt_descr agand_flashbased = { 12471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .options = NAND_BBT_SCANEMPTY | NAND_BBT_SCANALLPAGES, 12481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .offs = 0x20, 12491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .len = 6, 12501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .pattern = scan_agand_pattern 12511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 12521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12537854d3f7495b11be1570cd3e2318674d8f9ed797Brian Norris/* Generic flash bbt descriptors */ 12541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic uint8_t bbt_pattern[] = {'B', 'b', 't', '0' }; 12551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic uint8_t mirror_pattern[] = {'1', 't', 'b', 'B' }; 12561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic struct nand_bbt_descr bbt_main_descr = { 125861b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE 12591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP, 12601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .offs = 8, 12611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .len = 4, 12621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .veroffs = 12, 12631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .maxblocks = 4, 12641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .pattern = bbt_pattern 12651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 12661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic struct nand_bbt_descr bbt_mirror_descr = { 126861b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE 12691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP, 12701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .offs = 8, 12711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .len = 4, 12721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .veroffs = 12, 12731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .maxblocks = 4, 12741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .pattern = mirror_pattern 12751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 12761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12777cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewiorstatic struct nand_bbt_descr bbt_main_no_bbt_descr = { 12787cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE 12797cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP 12807cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior | NAND_BBT_NO_OOB, 12817cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior .len = 4, 12827cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior .veroffs = 4, 12837cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior .maxblocks = 4, 12847cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior .pattern = bbt_pattern 12857cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior}; 12867cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior 12877cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewiorstatic struct nand_bbt_descr bbt_mirror_no_bbt_descr = { 12887cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE 12897cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP 12907cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior | NAND_BBT_NO_OOB, 12917cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior .len = 4, 12927cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior .veroffs = 4, 12937cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior .maxblocks = 4, 12947cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior .pattern = mirror_pattern 12957cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior}; 12967cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior 1297752ed6c5f8c0ee182219ff8682f5a98e47ee866fBrian Norris#define BADBLOCK_SCAN_MASK (~NAND_BBT_NO_OOB) 129858373ff0afff4cc8ac40608872995f4d87eb72ecBrian Norris/** 1299752ed6c5f8c0ee182219ff8682f5a98e47ee866fBrian Norris * nand_create_badblock_pattern - [INTERN] Creates a BBT descriptor structure 13008b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @this: NAND chip to create descriptor for 130158373ff0afff4cc8ac40608872995f4d87eb72ecBrian Norris * 130258373ff0afff4cc8ac40608872995f4d87eb72ecBrian Norris * This function allocates and initializes a nand_bbt_descr for BBM detection 1303752ed6c5f8c0ee182219ff8682f5a98e47ee866fBrian Norris * based on the properties of @this. The new descriptor is stored in 130458373ff0afff4cc8ac40608872995f4d87eb72ecBrian Norris * this->badblock_pattern. Thus, this->badblock_pattern should be NULL when 130558373ff0afff4cc8ac40608872995f4d87eb72ecBrian Norris * passed to this function. 130658373ff0afff4cc8ac40608872995f4d87eb72ecBrian Norris */ 1307752ed6c5f8c0ee182219ff8682f5a98e47ee866fBrian Norrisstatic int nand_create_badblock_pattern(struct nand_chip *this) 130858373ff0afff4cc8ac40608872995f4d87eb72ecBrian Norris{ 130958373ff0afff4cc8ac40608872995f4d87eb72ecBrian Norris struct nand_bbt_descr *bd; 131058373ff0afff4cc8ac40608872995f4d87eb72ecBrian Norris if (this->badblock_pattern) { 1311752ed6c5f8c0ee182219ff8682f5a98e47ee866fBrian Norris pr_warn("Bad block pattern already allocated; not replacing\n"); 131258373ff0afff4cc8ac40608872995f4d87eb72ecBrian Norris return -EINVAL; 131358373ff0afff4cc8ac40608872995f4d87eb72ecBrian Norris } 131458373ff0afff4cc8ac40608872995f4d87eb72ecBrian Norris bd = kzalloc(sizeof(*bd), GFP_KERNEL); 13150870066d7e6c85bbe37741137e4c4731501a98e0Brian Norris if (!bd) 131658373ff0afff4cc8ac40608872995f4d87eb72ecBrian Norris return -ENOMEM; 1317752ed6c5f8c0ee182219ff8682f5a98e47ee866fBrian Norris bd->options = this->bbt_options & BADBLOCK_SCAN_MASK; 131858373ff0afff4cc8ac40608872995f4d87eb72ecBrian Norris bd->offs = this->badblockpos; 131958373ff0afff4cc8ac40608872995f4d87eb72ecBrian Norris bd->len = (this->options & NAND_BUSWIDTH_16) ? 2 : 1; 132058373ff0afff4cc8ac40608872995f4d87eb72ecBrian Norris bd->pattern = scan_ff_pattern; 132158373ff0afff4cc8ac40608872995f4d87eb72ecBrian Norris bd->options |= NAND_BBT_DYNAMICSTRUCT; 132258373ff0afff4cc8ac40608872995f4d87eb72ecBrian Norris this->badblock_pattern = bd; 132358373ff0afff4cc8ac40608872995f4d87eb72ecBrian Norris return 0; 132458373ff0afff4cc8ac40608872995f4d87eb72ecBrian Norris} 132558373ff0afff4cc8ac40608872995f4d87eb72ecBrian Norris 13261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/** 132761b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner * nand_default_bbt - [NAND Interface] Select a default bad block table for the device 13288b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @mtd: MTD device structure 13291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 13308b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * This function selects the default bad block table support for the device and 13318b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * calls the nand_scan_bbt function. 13328b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris */ 1333e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouseint nand_default_bbt(struct mtd_info *mtd) 13341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 13351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct nand_chip *this = mtd->priv; 133661b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner 13378b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris /* 13388b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * Default for AG-AND. We must use a flash based bad block table as the 13398b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * devices have factory marked _good_ blocks. Erasing those blocks 13408b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * leads to loss of the good / bad information, so we _must_ store this 13418b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * information in a good / bad table during startup. 1342e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse */ 13431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (this->options & NAND_IS_AND) { 13441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Use the default pattern descriptors */ 134561b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner if (!this->bbt_td) { 13461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds this->bbt_td = &bbt_main_descr; 13471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds this->bbt_md = &bbt_mirror_descr; 134861b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner } 1349bb9ebd4e714385a2592a482845865ef2d58b2868Brian Norris this->bbt_options |= NAND_BBT_USE_FLASH; 1350e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse return nand_scan_bbt(mtd, &agand_flashbased); 13511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 135261b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner 13538b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris /* Is a flash based bad block table requested? */ 1354bb9ebd4e714385a2592a482845865ef2d58b2868Brian Norris if (this->bbt_options & NAND_BBT_USE_FLASH) { 135561b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner /* Use the default pattern descriptors */ 135661b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner if (!this->bbt_td) { 1357a40f73419f02e40555f692785ea1c1813d5b4c12Brian Norris if (this->bbt_options & NAND_BBT_NO_OOB) { 13587cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior this->bbt_td = &bbt_main_no_bbt_descr; 13597cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior this->bbt_md = &bbt_mirror_no_bbt_descr; 13607cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior } else { 13617cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior this->bbt_td = &bbt_main_descr; 13627cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior this->bbt_md = &bbt_mirror_descr; 13637cba7b14fe179969d7217cca52e28519d7d6ca89Sebastian Andrzej Siewior } 13641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 13651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 13661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds this->bbt_td = NULL; 13671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds this->bbt_md = NULL; 13681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 1369a2f812df0b3d467db2ae5e3be38c36ff692ff99fBrian Norris 1370a2f812df0b3d467db2ae5e3be38c36ff692ff99fBrian Norris if (!this->badblock_pattern) 1371752ed6c5f8c0ee182219ff8682f5a98e47ee866fBrian Norris nand_create_badblock_pattern(this); 1372a2f812df0b3d467db2ae5e3be38c36ff692ff99fBrian Norris 1373e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse return nand_scan_bbt(mtd, this->badblock_pattern); 13741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 13751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 13761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/** 137761b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner * nand_isbad_bbt - [NAND Interface] Check if a block is bad 13788b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @mtd: MTD device structure 13798b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @offs: offset in the device 13808b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris * @allowbbt: allow access to bad block table region 13818b6e50c9eba8bf44b2dfd931d359706a461d2cfdBrian Norris */ 1382e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouseint nand_isbad_bbt(struct mtd_info *mtd, loff_t offs, int allowbbt) 13831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 13841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct nand_chip *this = mtd->priv; 13851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int block; 1386e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse uint8_t res; 138761b03bd7c3b55498c6180d43bf71b7bf49114b64Thomas Gleixner 13881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Get block number * 2 */ 1389e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse block = (int)(offs >> (this->bbt_erase_shift - 1)); 13901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds res = (this->bbt[block >> 3] >> (block & 0x06)) & 0x03; 13911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1392289c05222172b51401dbbb017115655f241d94abBrian Norris pr_debug("nand_isbad_bbt(): bbt info for offs 0x%08x: " 1393289c05222172b51401dbbb017115655f241d94abBrian Norris "(block %d) 0x%02x\n", 1394289c05222172b51401dbbb017115655f241d94abBrian Norris (unsigned int)offs, block >> 1, res); 13951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 13961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds switch ((int)res) { 1397e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse case 0x00: 1398e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse return 0; 1399e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse case 0x01: 1400e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse return 1; 1401e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse case 0x02: 1402e0c7d7675331140e5186d2d1a0efce1d3877d379David Woodhouse return allowbbt ? 0 : 1; 14031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 14041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 1; 14051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 14061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1407e0c7d7675331140e5186d2d1a0efce1d3877d379David WoodhouseEXPORT_SYMBOL(nand_scan_bbt); 1408e0c7d7675331140e5186d2d1a0efce1d3877d379David WoodhouseEXPORT_SYMBOL(nand_default_bbt); 1409