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1455 lines
40 KiB
1455 lines
40 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Overview: |
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* Bad block table support for the NAND driver |
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* |
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* Copyright © 2004 Thomas Gleixner ([email protected]) |
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* |
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* Description: |
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* |
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* When nand_scan_bbt is called, then it tries to find the bad block table |
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* depending on the options in the BBT descriptor(s). If no flash based BBT |
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* (NAND_BBT_USE_FLASH) is specified then the device is scanned for factory |
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* marked good / bad blocks. This information is used to create a memory BBT. |
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* Once a new bad block is discovered then the "factory" information is updated |
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* on the device. |
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* If a flash based BBT is specified then the function first tries to find the |
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* BBT on flash. If a BBT is found then the contents are read and the memory |
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* based BBT is created. If a mirrored BBT is selected then the mirror is |
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* searched too and the versions are compared. If the mirror has a greater |
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* version number, then the mirror BBT is used to build the memory based BBT. |
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* If the tables are not versioned, then we "or" the bad block information. |
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* If one of the BBTs is out of date or does not exist it is (re)created. |
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* If no BBT exists at all then the device is scanned for factory marked |
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* good / bad blocks and the bad block tables are created. |
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* |
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* For manufacturer created BBTs like the one found on M-SYS DOC devices |
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* the BBT is searched and read but never created |
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* |
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* The auto generated bad block table is located in the last good blocks |
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* of the device. The table is mirrored, so it can be updated eventually. |
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* The table is marked in the OOB area with an ident pattern and a version |
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* number which indicates which of both tables is more up to date. If the NAND |
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* controller needs the complete OOB area for the ECC information then the |
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* option NAND_BBT_NO_OOB should be used (along with NAND_BBT_USE_FLASH, of |
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* course): it moves the ident pattern and the version byte into the data area |
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* and the OOB area will remain untouched. |
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* |
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* The table uses 2 bits per block |
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* 11b: block is good |
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* 00b: block is factory marked bad |
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* 01b, 10b: block is marked bad due to wear |
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* |
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* The memory bad block table uses the following scheme: |
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* 00b: block is good |
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* 01b: block is marked bad due to wear |
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* 10b: block is reserved (to protect the bbt area) |
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* 11b: block is factory marked bad |
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* |
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* Multichip devices like DOC store the bad block info per floor. |
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* |
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* Following assumptions are made: |
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* - bbts start at a page boundary, if autolocated on a block boundary |
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* - the space necessary for a bbt in FLASH does not exceed a block boundary |
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*/ |
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|
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#include <linux/slab.h> |
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#include <linux/types.h> |
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#include <linux/mtd/mtd.h> |
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#include <linux/mtd/bbm.h> |
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#include <linux/bitops.h> |
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#include <linux/delay.h> |
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#include <linux/vmalloc.h> |
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#include <linux/export.h> |
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#include <linux/string.h> |
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|
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#include "internals.h" |
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|
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#define BBT_BLOCK_GOOD 0x00 |
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#define BBT_BLOCK_WORN 0x01 |
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#define BBT_BLOCK_RESERVED 0x02 |
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#define BBT_BLOCK_FACTORY_BAD 0x03 |
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|
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#define BBT_ENTRY_MASK 0x03 |
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#define BBT_ENTRY_SHIFT 2 |
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|
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static inline uint8_t bbt_get_entry(struct nand_chip *chip, int block) |
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{ |
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uint8_t entry = chip->bbt[block >> BBT_ENTRY_SHIFT]; |
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entry >>= (block & BBT_ENTRY_MASK) * 2; |
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return entry & BBT_ENTRY_MASK; |
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} |
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|
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static inline void bbt_mark_entry(struct nand_chip *chip, int block, |
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uint8_t mark) |
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{ |
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uint8_t msk = (mark & BBT_ENTRY_MASK) << ((block & BBT_ENTRY_MASK) * 2); |
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chip->bbt[block >> BBT_ENTRY_SHIFT] |= msk; |
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} |
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|
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static int check_pattern_no_oob(uint8_t *buf, struct nand_bbt_descr *td) |
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{ |
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if (memcmp(buf, td->pattern, td->len)) |
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return -1; |
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return 0; |
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} |
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|
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/** |
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* check_pattern - [GENERIC] check if a pattern is in the buffer |
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* @buf: the buffer to search |
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* @len: the length of buffer to search |
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* @paglen: the pagelength |
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* @td: search pattern descriptor |
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* |
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* Check for a pattern at the given place. Used to search bad block tables and |
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* good / bad block identifiers. |
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*/ |
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static int check_pattern(uint8_t *buf, int len, int paglen, struct nand_bbt_descr *td) |
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{ |
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if (td->options & NAND_BBT_NO_OOB) |
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return check_pattern_no_oob(buf, td); |
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|
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/* Compare the pattern */ |
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if (memcmp(buf + paglen + td->offs, td->pattern, td->len)) |
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return -1; |
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|
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return 0; |
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} |
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|
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/** |
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* check_short_pattern - [GENERIC] check if a pattern is in the buffer |
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* @buf: the buffer to search |
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* @td: search pattern descriptor |
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* |
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* Check for a pattern at the given place. Used to search bad block tables and |
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* good / bad block identifiers. Same as check_pattern, but no optional empty |
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* check. |
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*/ |
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static int check_short_pattern(uint8_t *buf, struct nand_bbt_descr *td) |
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{ |
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/* Compare the pattern */ |
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if (memcmp(buf + td->offs, td->pattern, td->len)) |
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return -1; |
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return 0; |
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} |
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|
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/** |
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* add_marker_len - compute the length of the marker in data area |
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* @td: BBT descriptor used for computation |
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* |
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* The length will be 0 if the marker is located in OOB area. |
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*/ |
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static u32 add_marker_len(struct nand_bbt_descr *td) |
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{ |
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u32 len; |
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|
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if (!(td->options & NAND_BBT_NO_OOB)) |
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return 0; |
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|
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len = td->len; |
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if (td->options & NAND_BBT_VERSION) |
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len++; |
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return len; |
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} |
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|
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/** |
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* read_bbt - [GENERIC] Read the bad block table starting from page |
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* @this: NAND chip object |
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* @buf: temporary buffer |
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* @page: the starting page |
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* @num: the number of bbt descriptors to read |
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* @td: the bbt describtion table |
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* @offs: block number offset in the table |
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* |
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* Read the bad block table starting from page. |
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*/ |
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static int read_bbt(struct nand_chip *this, uint8_t *buf, int page, int num, |
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struct nand_bbt_descr *td, int offs) |
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{ |
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struct mtd_info *mtd = nand_to_mtd(this); |
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int res, ret = 0, i, j, act = 0; |
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size_t retlen, len, totlen; |
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loff_t from; |
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int bits = td->options & NAND_BBT_NRBITS_MSK; |
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uint8_t msk = (uint8_t)((1 << bits) - 1); |
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u32 marker_len; |
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int reserved_block_code = td->reserved_block_code; |
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|
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totlen = (num * bits) >> 3; |
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marker_len = add_marker_len(td); |
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from = ((loff_t)page) << this->page_shift; |
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|
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while (totlen) { |
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len = min(totlen, (size_t)(1 << this->bbt_erase_shift)); |
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if (marker_len) { |
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/* |
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* In case the BBT marker is not in the OOB area it |
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* will be just in the first page. |
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*/ |
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len -= marker_len; |
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from += marker_len; |
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marker_len = 0; |
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} |
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res = mtd_read(mtd, from, len, &retlen, buf); |
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if (res < 0) { |
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if (mtd_is_eccerr(res)) { |
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pr_info("nand_bbt: ECC error in BBT at 0x%012llx\n", |
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from & ~mtd->writesize); |
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return res; |
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} else if (mtd_is_bitflip(res)) { |
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pr_info("nand_bbt: corrected error in BBT at 0x%012llx\n", |
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from & ~mtd->writesize); |
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ret = res; |
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} else { |
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pr_info("nand_bbt: error reading BBT\n"); |
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return res; |
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} |
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} |
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|
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/* Analyse data */ |
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for (i = 0; i < len; i++) { |
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uint8_t dat = buf[i]; |
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for (j = 0; j < 8; j += bits, act++) { |
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uint8_t tmp = (dat >> j) & msk; |
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if (tmp == msk) |
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continue; |
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if (reserved_block_code && (tmp == reserved_block_code)) { |
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pr_info("nand_read_bbt: reserved block at 0x%012llx\n", |
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(loff_t)(offs + act) << |
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this->bbt_erase_shift); |
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bbt_mark_entry(this, offs + act, |
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BBT_BLOCK_RESERVED); |
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mtd->ecc_stats.bbtblocks++; |
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continue; |
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} |
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/* |
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* Leave it for now, if it's matured we can |
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* move this message to pr_debug. |
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*/ |
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pr_info("nand_read_bbt: bad block at 0x%012llx\n", |
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(loff_t)(offs + act) << |
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this->bbt_erase_shift); |
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/* Factory marked bad or worn out? */ |
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if (tmp == 0) |
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bbt_mark_entry(this, offs + act, |
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BBT_BLOCK_FACTORY_BAD); |
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else |
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bbt_mark_entry(this, offs + act, |
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BBT_BLOCK_WORN); |
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mtd->ecc_stats.badblocks++; |
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} |
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} |
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totlen -= len; |
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from += len; |
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} |
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return ret; |
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} |
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|
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/** |
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* read_abs_bbt - [GENERIC] Read the bad block table starting at a given page |
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* @this: NAND chip object |
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* @buf: temporary buffer |
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* @td: descriptor for the bad block table |
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* @chip: read the table for a specific chip, -1 read all chips; applies only if |
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* NAND_BBT_PERCHIP option is set |
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* |
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* Read the bad block table for all chips starting at a given page. We assume |
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* that the bbt bits are in consecutive order. |
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*/ |
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static int read_abs_bbt(struct nand_chip *this, uint8_t *buf, |
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struct nand_bbt_descr *td, int chip) |
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{ |
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struct mtd_info *mtd = nand_to_mtd(this); |
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u64 targetsize = nanddev_target_size(&this->base); |
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int res = 0, i; |
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|
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if (td->options & NAND_BBT_PERCHIP) { |
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int offs = 0; |
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for (i = 0; i < nanddev_ntargets(&this->base); i++) { |
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if (chip == -1 || chip == i) |
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res = read_bbt(this, buf, td->pages[i], |
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targetsize >> this->bbt_erase_shift, |
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td, offs); |
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if (res) |
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return res; |
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offs += targetsize >> this->bbt_erase_shift; |
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} |
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} else { |
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res = read_bbt(this, buf, td->pages[0], |
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mtd->size >> this->bbt_erase_shift, td, 0); |
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if (res) |
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return res; |
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} |
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return 0; |
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} |
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|
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/* BBT marker is in the first page, no OOB */ |
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static int scan_read_data(struct nand_chip *this, uint8_t *buf, loff_t offs, |
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struct nand_bbt_descr *td) |
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{ |
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struct mtd_info *mtd = nand_to_mtd(this); |
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size_t retlen; |
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size_t len; |
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|
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len = td->len; |
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if (td->options & NAND_BBT_VERSION) |
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len++; |
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|
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return mtd_read(mtd, offs, len, &retlen, buf); |
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} |
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|
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/** |
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* scan_read_oob - [GENERIC] Scan data+OOB region to buffer |
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* @this: NAND chip object |
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* @buf: temporary buffer |
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* @offs: offset at which to scan |
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* @len: length of data region to read |
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* |
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* Scan read data from data+OOB. May traverse multiple pages, interleaving |
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* page,OOB,page,OOB,... in buf. Completes transfer and returns the "strongest" |
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* ECC condition (error or bitflip). May quit on the first (non-ECC) error. |
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*/ |
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static int scan_read_oob(struct nand_chip *this, uint8_t *buf, loff_t offs, |
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size_t len) |
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{ |
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struct mtd_info *mtd = nand_to_mtd(this); |
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struct mtd_oob_ops ops; |
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int res, ret = 0; |
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|
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ops.mode = MTD_OPS_PLACE_OOB; |
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ops.ooboffs = 0; |
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ops.ooblen = mtd->oobsize; |
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|
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while (len > 0) { |
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ops.datbuf = buf; |
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ops.len = min(len, (size_t)mtd->writesize); |
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ops.oobbuf = buf + ops.len; |
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|
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res = mtd_read_oob(mtd, offs, &ops); |
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if (res) { |
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if (!mtd_is_bitflip_or_eccerr(res)) |
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return res; |
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else if (mtd_is_eccerr(res) || !ret) |
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ret = res; |
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} |
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|
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buf += mtd->oobsize + mtd->writesize; |
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len -= mtd->writesize; |
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offs += mtd->writesize; |
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} |
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return ret; |
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} |
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|
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static int scan_read(struct nand_chip *this, uint8_t *buf, loff_t offs, |
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size_t len, struct nand_bbt_descr *td) |
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{ |
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if (td->options & NAND_BBT_NO_OOB) |
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return scan_read_data(this, buf, offs, td); |
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else |
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return scan_read_oob(this, buf, offs, len); |
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} |
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|
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/* Scan write data with oob to flash */ |
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static int scan_write_bbt(struct nand_chip *this, loff_t offs, size_t len, |
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uint8_t *buf, uint8_t *oob) |
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{ |
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struct mtd_info *mtd = nand_to_mtd(this); |
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struct mtd_oob_ops ops; |
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|
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ops.mode = MTD_OPS_PLACE_OOB; |
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ops.ooboffs = 0; |
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ops.ooblen = mtd->oobsize; |
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ops.datbuf = buf; |
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ops.oobbuf = oob; |
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ops.len = len; |
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|
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return mtd_write_oob(mtd, offs, &ops); |
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} |
|
|
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static u32 bbt_get_ver_offs(struct nand_chip *this, struct nand_bbt_descr *td) |
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{ |
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struct mtd_info *mtd = nand_to_mtd(this); |
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u32 ver_offs = td->veroffs; |
|
|
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if (!(td->options & NAND_BBT_NO_OOB)) |
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ver_offs += mtd->writesize; |
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return ver_offs; |
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} |
|
|
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/** |
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* read_abs_bbts - [GENERIC] Read the bad block table(s) for all chips starting at a given page |
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* @this: NAND chip object |
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* @buf: temporary buffer |
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* @td: descriptor for the bad block table |
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* @md: descriptor for the bad block table mirror |
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* |
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* Read the bad block table(s) for all chips starting at a given page. We |
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* assume that the bbt bits are in consecutive order. |
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*/ |
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static void read_abs_bbts(struct nand_chip *this, uint8_t *buf, |
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struct nand_bbt_descr *td, struct nand_bbt_descr *md) |
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{ |
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struct mtd_info *mtd = nand_to_mtd(this); |
|
|
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/* Read the primary version, if available */ |
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if (td->options & NAND_BBT_VERSION) { |
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scan_read(this, buf, (loff_t)td->pages[0] << this->page_shift, |
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mtd->writesize, td); |
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td->version[0] = buf[bbt_get_ver_offs(this, td)]; |
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pr_info("Bad block table at page %d, version 0x%02X\n", |
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td->pages[0], td->version[0]); |
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} |
|
|
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/* Read the mirror version, if available */ |
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if (md && (md->options & NAND_BBT_VERSION)) { |
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scan_read(this, buf, (loff_t)md->pages[0] << this->page_shift, |
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mtd->writesize, md); |
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md->version[0] = buf[bbt_get_ver_offs(this, md)]; |
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pr_info("Bad block table at page %d, version 0x%02X\n", |
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md->pages[0], md->version[0]); |
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} |
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} |
|
|
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/* Scan a given block partially */ |
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static int scan_block_fast(struct nand_chip *this, struct nand_bbt_descr *bd, |
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loff_t offs, uint8_t *buf) |
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{ |
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struct mtd_info *mtd = nand_to_mtd(this); |
|
|
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struct mtd_oob_ops ops; |
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int ret, page_offset; |
|
|
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ops.ooblen = mtd->oobsize; |
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ops.oobbuf = buf; |
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ops.ooboffs = 0; |
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ops.datbuf = NULL; |
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ops.mode = MTD_OPS_PLACE_OOB; |
|
|
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page_offset = nand_bbm_get_next_page(this, 0); |
|
|
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while (page_offset >= 0) { |
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/* |
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* Read the full oob until read_oob is fixed to handle single |
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* byte reads for 16 bit buswidth. |
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*/ |
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ret = mtd_read_oob(mtd, offs + (page_offset * mtd->writesize), |
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&ops); |
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/* Ignore ECC errors when checking for BBM */ |
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if (ret && !mtd_is_bitflip_or_eccerr(ret)) |
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return ret; |
|
|
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if (check_short_pattern(buf, bd)) |
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return 1; |
|
|
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page_offset = nand_bbm_get_next_page(this, page_offset + 1); |
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} |
|
|
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return 0; |
|
} |
|
|
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/** |
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* create_bbt - [GENERIC] Create a bad block table by scanning the device |
|
* @this: NAND chip object |
|
* @buf: temporary buffer |
|
* @bd: descriptor for the good/bad block search pattern |
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* @chip: create the table for a specific chip, -1 read all chips; applies only |
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* if NAND_BBT_PERCHIP option is set |
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* |
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* Create a bad block table by scanning the device for the given good/bad block |
|
* identify pattern. |
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*/ |
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static int create_bbt(struct nand_chip *this, uint8_t *buf, |
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struct nand_bbt_descr *bd, int chip) |
|
{ |
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u64 targetsize = nanddev_target_size(&this->base); |
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struct mtd_info *mtd = nand_to_mtd(this); |
|
int i, numblocks, startblock; |
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loff_t from; |
|
|
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pr_info("Scanning device for bad blocks\n"); |
|
|
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if (chip == -1) { |
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numblocks = mtd->size >> this->bbt_erase_shift; |
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startblock = 0; |
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from = 0; |
|
} else { |
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if (chip >= nanddev_ntargets(&this->base)) { |
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pr_warn("create_bbt(): chipnr (%d) > available chips (%d)\n", |
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chip + 1, nanddev_ntargets(&this->base)); |
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return -EINVAL; |
|
} |
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numblocks = targetsize >> this->bbt_erase_shift; |
|
startblock = chip * numblocks; |
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numblocks += startblock; |
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from = (loff_t)startblock << this->bbt_erase_shift; |
|
} |
|
|
|
for (i = startblock; i < numblocks; i++) { |
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int ret; |
|
|
|
BUG_ON(bd->options & NAND_BBT_NO_OOB); |
|
|
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ret = scan_block_fast(this, bd, from, buf); |
|
if (ret < 0) |
|
return ret; |
|
|
|
if (ret) { |
|
bbt_mark_entry(this, i, BBT_BLOCK_FACTORY_BAD); |
|
pr_warn("Bad eraseblock %d at 0x%012llx\n", |
|
i, (unsigned long long)from); |
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mtd->ecc_stats.badblocks++; |
|
} |
|
|
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from += (1 << this->bbt_erase_shift); |
|
} |
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return 0; |
|
} |
|
|
|
/** |
|
* search_bbt - [GENERIC] scan the device for a specific bad block table |
|
* @this: NAND chip object |
|
* @buf: temporary buffer |
|
* @td: descriptor for the bad block table |
|
* |
|
* Read the bad block table by searching for a given ident pattern. Search is |
|
* preformed either from the beginning up or from the end of the device |
|
* downwards. The search starts always at the start of a block. If the option |
|
* NAND_BBT_PERCHIP is given, each chip is searched for a bbt, which contains |
|
* the bad block information of this chip. This is necessary to provide support |
|
* for certain DOC devices. |
|
* |
|
* The bbt ident pattern resides in the oob area of the first page in a block. |
|
*/ |
|
static int search_bbt(struct nand_chip *this, uint8_t *buf, |
|
struct nand_bbt_descr *td) |
|
{ |
|
u64 targetsize = nanddev_target_size(&this->base); |
|
struct mtd_info *mtd = nand_to_mtd(this); |
|
int i, chips; |
|
int startblock, block, dir; |
|
int scanlen = mtd->writesize + mtd->oobsize; |
|
int bbtblocks; |
|
int blocktopage = this->bbt_erase_shift - this->page_shift; |
|
|
|
/* Search direction top -> down? */ |
|
if (td->options & NAND_BBT_LASTBLOCK) { |
|
startblock = (mtd->size >> this->bbt_erase_shift) - 1; |
|
dir = -1; |
|
} else { |
|
startblock = 0; |
|
dir = 1; |
|
} |
|
|
|
/* Do we have a bbt per chip? */ |
|
if (td->options & NAND_BBT_PERCHIP) { |
|
chips = nanddev_ntargets(&this->base); |
|
bbtblocks = targetsize >> this->bbt_erase_shift; |
|
startblock &= bbtblocks - 1; |
|
} else { |
|
chips = 1; |
|
bbtblocks = mtd->size >> this->bbt_erase_shift; |
|
} |
|
|
|
for (i = 0; i < chips; i++) { |
|
/* Reset version information */ |
|
td->version[i] = 0; |
|
td->pages[i] = -1; |
|
/* Scan the maximum number of blocks */ |
|
for (block = 0; block < td->maxblocks; block++) { |
|
|
|
int actblock = startblock + dir * block; |
|
loff_t offs = (loff_t)actblock << this->bbt_erase_shift; |
|
|
|
/* Read first page */ |
|
scan_read(this, buf, offs, mtd->writesize, td); |
|
if (!check_pattern(buf, scanlen, mtd->writesize, td)) { |
|
td->pages[i] = actblock << blocktopage; |
|
if (td->options & NAND_BBT_VERSION) { |
|
offs = bbt_get_ver_offs(this, td); |
|
td->version[i] = buf[offs]; |
|
} |
|
break; |
|
} |
|
} |
|
startblock += targetsize >> this->bbt_erase_shift; |
|
} |
|
/* Check, if we found a bbt for each requested chip */ |
|
for (i = 0; i < chips; i++) { |
|
if (td->pages[i] == -1) |
|
pr_warn("Bad block table not found for chip %d\n", i); |
|
else |
|
pr_info("Bad block table found at page %d, version 0x%02X\n", |
|
td->pages[i], td->version[i]); |
|
} |
|
return 0; |
|
} |
|
|
|
/** |
|
* search_read_bbts - [GENERIC] scan the device for bad block table(s) |
|
* @this: NAND chip object |
|
* @buf: temporary buffer |
|
* @td: descriptor for the bad block table |
|
* @md: descriptor for the bad block table mirror |
|
* |
|
* Search and read the bad block table(s). |
|
*/ |
|
static void search_read_bbts(struct nand_chip *this, uint8_t *buf, |
|
struct nand_bbt_descr *td, |
|
struct nand_bbt_descr *md) |
|
{ |
|
/* Search the primary table */ |
|
search_bbt(this, buf, td); |
|
|
|
/* Search the mirror table */ |
|
if (md) |
|
search_bbt(this, buf, md); |
|
} |
|
|
|
/** |
|
* get_bbt_block - Get the first valid eraseblock suitable to store a BBT |
|
* @this: the NAND device |
|
* @td: the BBT description |
|
* @md: the mirror BBT descriptor |
|
* @chip: the CHIP selector |
|
* |
|
* This functions returns a positive block number pointing a valid eraseblock |
|
* suitable to store a BBT (i.e. in the range reserved for BBT), or -ENOSPC if |
|
* all blocks are already used of marked bad. If td->pages[chip] was already |
|
* pointing to a valid block we re-use it, otherwise we search for the next |
|
* valid one. |
|
*/ |
|
static int get_bbt_block(struct nand_chip *this, struct nand_bbt_descr *td, |
|
struct nand_bbt_descr *md, int chip) |
|
{ |
|
u64 targetsize = nanddev_target_size(&this->base); |
|
int startblock, dir, page, numblocks, i; |
|
|
|
/* |
|
* There was already a version of the table, reuse the page. This |
|
* applies for absolute placement too, as we have the page number in |
|
* td->pages. |
|
*/ |
|
if (td->pages[chip] != -1) |
|
return td->pages[chip] >> |
|
(this->bbt_erase_shift - this->page_shift); |
|
|
|
numblocks = (int)(targetsize >> this->bbt_erase_shift); |
|
if (!(td->options & NAND_BBT_PERCHIP)) |
|
numblocks *= nanddev_ntargets(&this->base); |
|
|
|
/* |
|
* Automatic placement of the bad block table. Search direction |
|
* top -> down? |
|
*/ |
|
if (td->options & NAND_BBT_LASTBLOCK) { |
|
startblock = numblocks * (chip + 1) - 1; |
|
dir = -1; |
|
} else { |
|
startblock = chip * numblocks; |
|
dir = 1; |
|
} |
|
|
|
for (i = 0; i < td->maxblocks; i++) { |
|
int block = startblock + dir * i; |
|
|
|
/* Check, if the block is bad */ |
|
switch (bbt_get_entry(this, block)) { |
|
case BBT_BLOCK_WORN: |
|
case BBT_BLOCK_FACTORY_BAD: |
|
continue; |
|
} |
|
|
|
page = block << (this->bbt_erase_shift - this->page_shift); |
|
|
|
/* Check, if the block is used by the mirror table */ |
|
if (!md || md->pages[chip] != page) |
|
return block; |
|
} |
|
|
|
return -ENOSPC; |
|
} |
|
|
|
/** |
|
* mark_bbt_block_bad - Mark one of the block reserved for BBT bad |
|
* @this: the NAND device |
|
* @td: the BBT description |
|
* @chip: the CHIP selector |
|
* @block: the BBT block to mark |
|
* |
|
* Blocks reserved for BBT can become bad. This functions is an helper to mark |
|
* such blocks as bad. It takes care of updating the in-memory BBT, marking the |
|
* block as bad using a bad block marker and invalidating the associated |
|
* td->pages[] entry. |
|
*/ |
|
static void mark_bbt_block_bad(struct nand_chip *this, |
|
struct nand_bbt_descr *td, |
|
int chip, int block) |
|
{ |
|
loff_t to; |
|
int res; |
|
|
|
bbt_mark_entry(this, block, BBT_BLOCK_WORN); |
|
|
|
to = (loff_t)block << this->bbt_erase_shift; |
|
res = nand_markbad_bbm(this, to); |
|
if (res) |
|
pr_warn("nand_bbt: error %d while marking block %d bad\n", |
|
res, block); |
|
|
|
td->pages[chip] = -1; |
|
} |
|
|
|
/** |
|
* write_bbt - [GENERIC] (Re)write the bad block table |
|
* @this: NAND chip object |
|
* @buf: temporary buffer |
|
* @td: descriptor for the bad block table |
|
* @md: descriptor for the bad block table mirror |
|
* @chipsel: selector for a specific chip, -1 for all |
|
* |
|
* (Re)write the bad block table. |
|
*/ |
|
static int write_bbt(struct nand_chip *this, uint8_t *buf, |
|
struct nand_bbt_descr *td, struct nand_bbt_descr *md, |
|
int chipsel) |
|
{ |
|
u64 targetsize = nanddev_target_size(&this->base); |
|
struct mtd_info *mtd = nand_to_mtd(this); |
|
struct erase_info einfo; |
|
int i, res, chip = 0; |
|
int bits, page, offs, numblocks, sft, sftmsk; |
|
int nrchips, pageoffs, ooboffs; |
|
uint8_t msk[4]; |
|
uint8_t rcode = td->reserved_block_code; |
|
size_t retlen, len = 0; |
|
loff_t to; |
|
struct mtd_oob_ops ops; |
|
|
|
ops.ooblen = mtd->oobsize; |
|
ops.ooboffs = 0; |
|
ops.datbuf = NULL; |
|
ops.mode = MTD_OPS_PLACE_OOB; |
|
|
|
if (!rcode) |
|
rcode = 0xff; |
|
/* Write bad block table per chip rather than per device? */ |
|
if (td->options & NAND_BBT_PERCHIP) { |
|
numblocks = (int)(targetsize >> this->bbt_erase_shift); |
|
/* Full device write or specific chip? */ |
|
if (chipsel == -1) { |
|
nrchips = nanddev_ntargets(&this->base); |
|
} else { |
|
nrchips = chipsel + 1; |
|
chip = chipsel; |
|
} |
|
} else { |
|
numblocks = (int)(mtd->size >> this->bbt_erase_shift); |
|
nrchips = 1; |
|
} |
|
|
|
/* Loop through the chips */ |
|
while (chip < nrchips) { |
|
int block; |
|
|
|
block = get_bbt_block(this, td, md, chip); |
|
if (block < 0) { |
|
pr_err("No space left to write bad block table\n"); |
|
res = block; |
|
goto outerr; |
|
} |
|
|
|
/* |
|
* get_bbt_block() returns a block number, shift the value to |
|
* get a page number. |
|
*/ |
|
page = block << (this->bbt_erase_shift - this->page_shift); |
|
|
|
/* Set up shift count and masks for the flash table */ |
|
bits = td->options & NAND_BBT_NRBITS_MSK; |
|
msk[2] = ~rcode; |
|
switch (bits) { |
|
case 1: sft = 3; sftmsk = 0x07; msk[0] = 0x00; msk[1] = 0x01; |
|
msk[3] = 0x01; |
|
break; |
|
case 2: sft = 2; sftmsk = 0x06; msk[0] = 0x00; msk[1] = 0x01; |
|
msk[3] = 0x03; |
|
break; |
|
case 4: sft = 1; sftmsk = 0x04; msk[0] = 0x00; msk[1] = 0x0C; |
|
msk[3] = 0x0f; |
|
break; |
|
case 8: sft = 0; sftmsk = 0x00; msk[0] = 0x00; msk[1] = 0x0F; |
|
msk[3] = 0xff; |
|
break; |
|
default: return -EINVAL; |
|
} |
|
|
|
to = ((loff_t)page) << this->page_shift; |
|
|
|
/* Must we save the block contents? */ |
|
if (td->options & NAND_BBT_SAVECONTENT) { |
|
/* Make it block aligned */ |
|
to &= ~(((loff_t)1 << this->bbt_erase_shift) - 1); |
|
len = 1 << this->bbt_erase_shift; |
|
res = mtd_read(mtd, to, len, &retlen, buf); |
|
if (res < 0) { |
|
if (retlen != len) { |
|
pr_info("nand_bbt: error reading block for writing the bad block table\n"); |
|
return res; |
|
} |
|
pr_warn("nand_bbt: ECC error while reading block for writing bad block table\n"); |
|
} |
|
/* Read oob data */ |
|
ops.ooblen = (len >> this->page_shift) * mtd->oobsize; |
|
ops.oobbuf = &buf[len]; |
|
res = mtd_read_oob(mtd, to + mtd->writesize, &ops); |
|
if (res < 0 || ops.oobretlen != ops.ooblen) |
|
goto outerr; |
|
|
|
/* Calc the byte offset in the buffer */ |
|
pageoffs = page - (int)(to >> this->page_shift); |
|
offs = pageoffs << this->page_shift; |
|
/* Preset the bbt area with 0xff */ |
|
memset(&buf[offs], 0xff, (size_t)(numblocks >> sft)); |
|
ooboffs = len + (pageoffs * mtd->oobsize); |
|
|
|
} else if (td->options & NAND_BBT_NO_OOB) { |
|
ooboffs = 0; |
|
offs = td->len; |
|
/* The version byte */ |
|
if (td->options & NAND_BBT_VERSION) |
|
offs++; |
|
/* Calc length */ |
|
len = (size_t)(numblocks >> sft); |
|
len += offs; |
|
/* Make it page aligned! */ |
|
len = ALIGN(len, mtd->writesize); |
|
/* Preset the buffer with 0xff */ |
|
memset(buf, 0xff, len); |
|
/* Pattern is located at the begin of first page */ |
|
memcpy(buf, td->pattern, td->len); |
|
} else { |
|
/* Calc length */ |
|
len = (size_t)(numblocks >> sft); |
|
/* Make it page aligned! */ |
|
len = ALIGN(len, mtd->writesize); |
|
/* Preset the buffer with 0xff */ |
|
memset(buf, 0xff, len + |
|
(len >> this->page_shift)* mtd->oobsize); |
|
offs = 0; |
|
ooboffs = len; |
|
/* Pattern is located in oob area of first page */ |
|
memcpy(&buf[ooboffs + td->offs], td->pattern, td->len); |
|
} |
|
|
|
if (td->options & NAND_BBT_VERSION) |
|
buf[ooboffs + td->veroffs] = td->version[chip]; |
|
|
|
/* Walk through the memory table */ |
|
for (i = 0; i < numblocks; i++) { |
|
uint8_t dat; |
|
int sftcnt = (i << (3 - sft)) & sftmsk; |
|
dat = bbt_get_entry(this, chip * numblocks + i); |
|
/* Do not store the reserved bbt blocks! */ |
|
buf[offs + (i >> sft)] &= ~(msk[dat] << sftcnt); |
|
} |
|
|
|
memset(&einfo, 0, sizeof(einfo)); |
|
einfo.addr = to; |
|
einfo.len = 1 << this->bbt_erase_shift; |
|
res = nand_erase_nand(this, &einfo, 1); |
|
if (res < 0) { |
|
pr_warn("nand_bbt: error while erasing BBT block %d\n", |
|
res); |
|
mark_bbt_block_bad(this, td, chip, block); |
|
continue; |
|
} |
|
|
|
res = scan_write_bbt(this, to, len, buf, |
|
td->options & NAND_BBT_NO_OOB ? |
|
NULL : &buf[len]); |
|
if (res < 0) { |
|
pr_warn("nand_bbt: error while writing BBT block %d\n", |
|
res); |
|
mark_bbt_block_bad(this, td, chip, block); |
|
continue; |
|
} |
|
|
|
pr_info("Bad block table written to 0x%012llx, version 0x%02X\n", |
|
(unsigned long long)to, td->version[chip]); |
|
|
|
/* Mark it as used */ |
|
td->pages[chip++] = page; |
|
} |
|
return 0; |
|
|
|
outerr: |
|
pr_warn("nand_bbt: error while writing bad block table %d\n", res); |
|
return res; |
|
} |
|
|
|
/** |
|
* nand_memory_bbt - [GENERIC] create a memory based bad block table |
|
* @this: NAND chip object |
|
* @bd: descriptor for the good/bad block search pattern |
|
* |
|
* The function creates a memory based bbt by scanning the device for |
|
* manufacturer / software marked good / bad blocks. |
|
*/ |
|
static inline int nand_memory_bbt(struct nand_chip *this, |
|
struct nand_bbt_descr *bd) |
|
{ |
|
u8 *pagebuf = nand_get_data_buf(this); |
|
|
|
return create_bbt(this, pagebuf, bd, -1); |
|
} |
|
|
|
/** |
|
* check_create - [GENERIC] create and write bbt(s) if necessary |
|
* @this: the NAND device |
|
* @buf: temporary buffer |
|
* @bd: descriptor for the good/bad block search pattern |
|
* |
|
* The function checks the results of the previous call to read_bbt and creates |
|
* / updates the bbt(s) if necessary. Creation is necessary if no bbt was found |
|
* for the chip/device. Update is necessary if one of the tables is missing or |
|
* the version nr. of one table is less than the other. |
|
*/ |
|
static int check_create(struct nand_chip *this, uint8_t *buf, |
|
struct nand_bbt_descr *bd) |
|
{ |
|
int i, chips, writeops, create, chipsel, res, res2; |
|
struct nand_bbt_descr *td = this->bbt_td; |
|
struct nand_bbt_descr *md = this->bbt_md; |
|
struct nand_bbt_descr *rd, *rd2; |
|
|
|
/* Do we have a bbt per chip? */ |
|
if (td->options & NAND_BBT_PERCHIP) |
|
chips = nanddev_ntargets(&this->base); |
|
else |
|
chips = 1; |
|
|
|
for (i = 0; i < chips; i++) { |
|
writeops = 0; |
|
create = 0; |
|
rd = NULL; |
|
rd2 = NULL; |
|
res = res2 = 0; |
|
/* Per chip or per device? */ |
|
chipsel = (td->options & NAND_BBT_PERCHIP) ? i : -1; |
|
/* Mirrored table available? */ |
|
if (md) { |
|
if (td->pages[i] == -1 && md->pages[i] == -1) { |
|
create = 1; |
|
writeops = 0x03; |
|
} else if (td->pages[i] == -1) { |
|
rd = md; |
|
writeops = 0x01; |
|
} else if (md->pages[i] == -1) { |
|
rd = td; |
|
writeops = 0x02; |
|
} else if (td->version[i] == md->version[i]) { |
|
rd = td; |
|
if (!(td->options & NAND_BBT_VERSION)) |
|
rd2 = md; |
|
} else if (((int8_t)(td->version[i] - md->version[i])) > 0) { |
|
rd = td; |
|
writeops = 0x02; |
|
} else { |
|
rd = md; |
|
writeops = 0x01; |
|
} |
|
} else { |
|
if (td->pages[i] == -1) { |
|
create = 1; |
|
writeops = 0x01; |
|
} else { |
|
rd = td; |
|
} |
|
} |
|
|
|
if (create) { |
|
/* Create the bad block table by scanning the device? */ |
|
if (!(td->options & NAND_BBT_CREATE)) |
|
continue; |
|
|
|
/* Create the table in memory by scanning the chip(s) */ |
|
if (!(this->bbt_options & NAND_BBT_CREATE_EMPTY)) |
|
create_bbt(this, buf, bd, chipsel); |
|
|
|
td->version[i] = 1; |
|
if (md) |
|
md->version[i] = 1; |
|
} |
|
|
|
/* Read back first? */ |
|
if (rd) { |
|
res = read_abs_bbt(this, buf, rd, chipsel); |
|
if (mtd_is_eccerr(res)) { |
|
/* Mark table as invalid */ |
|
rd->pages[i] = -1; |
|
rd->version[i] = 0; |
|
i--; |
|
continue; |
|
} |
|
} |
|
/* If they weren't versioned, read both */ |
|
if (rd2) { |
|
res2 = read_abs_bbt(this, buf, rd2, chipsel); |
|
if (mtd_is_eccerr(res2)) { |
|
/* Mark table as invalid */ |
|
rd2->pages[i] = -1; |
|
rd2->version[i] = 0; |
|
i--; |
|
continue; |
|
} |
|
} |
|
|
|
/* Scrub the flash table(s)? */ |
|
if (mtd_is_bitflip(res) || mtd_is_bitflip(res2)) |
|
writeops = 0x03; |
|
|
|
/* Update version numbers before writing */ |
|
if (md) { |
|
td->version[i] = max(td->version[i], md->version[i]); |
|
md->version[i] = td->version[i]; |
|
} |
|
|
|
/* Write the bad block table to the device? */ |
|
if ((writeops & 0x01) && (td->options & NAND_BBT_WRITE)) { |
|
res = write_bbt(this, buf, td, md, chipsel); |
|
if (res < 0) |
|
return res; |
|
} |
|
|
|
/* Write the mirror bad block table to the device? */ |
|
if ((writeops & 0x02) && md && (md->options & NAND_BBT_WRITE)) { |
|
res = write_bbt(this, buf, md, td, chipsel); |
|
if (res < 0) |
|
return res; |
|
} |
|
} |
|
return 0; |
|
} |
|
|
|
/** |
|
* nand_update_bbt - update bad block table(s) |
|
* @this: the NAND device |
|
* @offs: the offset of the newly marked block |
|
* |
|
* The function updates the bad block table(s). |
|
*/ |
|
static int nand_update_bbt(struct nand_chip *this, loff_t offs) |
|
{ |
|
struct mtd_info *mtd = nand_to_mtd(this); |
|
int len, res = 0; |
|
int chip, chipsel; |
|
uint8_t *buf; |
|
struct nand_bbt_descr *td = this->bbt_td; |
|
struct nand_bbt_descr *md = this->bbt_md; |
|
|
|
if (!this->bbt || !td) |
|
return -EINVAL; |
|
|
|
/* Allocate a temporary buffer for one eraseblock incl. oob */ |
|
len = (1 << this->bbt_erase_shift); |
|
len += (len >> this->page_shift) * mtd->oobsize; |
|
buf = kmalloc(len, GFP_KERNEL); |
|
if (!buf) |
|
return -ENOMEM; |
|
|
|
/* Do we have a bbt per chip? */ |
|
if (td->options & NAND_BBT_PERCHIP) { |
|
chip = (int)(offs >> this->chip_shift); |
|
chipsel = chip; |
|
} else { |
|
chip = 0; |
|
chipsel = -1; |
|
} |
|
|
|
td->version[chip]++; |
|
if (md) |
|
md->version[chip]++; |
|
|
|
/* Write the bad block table to the device? */ |
|
if (td->options & NAND_BBT_WRITE) { |
|
res = write_bbt(this, buf, td, md, chipsel); |
|
if (res < 0) |
|
goto out; |
|
} |
|
/* Write the mirror bad block table to the device? */ |
|
if (md && (md->options & NAND_BBT_WRITE)) { |
|
res = write_bbt(this, buf, md, td, chipsel); |
|
} |
|
|
|
out: |
|
kfree(buf); |
|
return res; |
|
} |
|
|
|
/** |
|
* mark_bbt_region - [GENERIC] mark the bad block table regions |
|
* @this: the NAND device |
|
* @td: bad block table descriptor |
|
* |
|
* The bad block table regions are marked as "bad" to prevent accidental |
|
* erasures / writes. The regions are identified by the mark 0x02. |
|
*/ |
|
static void mark_bbt_region(struct nand_chip *this, struct nand_bbt_descr *td) |
|
{ |
|
u64 targetsize = nanddev_target_size(&this->base); |
|
struct mtd_info *mtd = nand_to_mtd(this); |
|
int i, j, chips, block, nrblocks, update; |
|
uint8_t oldval; |
|
|
|
/* Do we have a bbt per chip? */ |
|
if (td->options & NAND_BBT_PERCHIP) { |
|
chips = nanddev_ntargets(&this->base); |
|
nrblocks = (int)(targetsize >> this->bbt_erase_shift); |
|
} else { |
|
chips = 1; |
|
nrblocks = (int)(mtd->size >> this->bbt_erase_shift); |
|
} |
|
|
|
for (i = 0; i < chips; i++) { |
|
if ((td->options & NAND_BBT_ABSPAGE) || |
|
!(td->options & NAND_BBT_WRITE)) { |
|
if (td->pages[i] == -1) |
|
continue; |
|
block = td->pages[i] >> (this->bbt_erase_shift - this->page_shift); |
|
oldval = bbt_get_entry(this, block); |
|
bbt_mark_entry(this, block, BBT_BLOCK_RESERVED); |
|
if ((oldval != BBT_BLOCK_RESERVED) && |
|
td->reserved_block_code) |
|
nand_update_bbt(this, (loff_t)block << |
|
this->bbt_erase_shift); |
|
continue; |
|
} |
|
update = 0; |
|
if (td->options & NAND_BBT_LASTBLOCK) |
|
block = ((i + 1) * nrblocks) - td->maxblocks; |
|
else |
|
block = i * nrblocks; |
|
for (j = 0; j < td->maxblocks; j++) { |
|
oldval = bbt_get_entry(this, block); |
|
bbt_mark_entry(this, block, BBT_BLOCK_RESERVED); |
|
if (oldval != BBT_BLOCK_RESERVED) |
|
update = 1; |
|
block++; |
|
} |
|
/* |
|
* If we want reserved blocks to be recorded to flash, and some |
|
* new ones have been marked, then we need to update the stored |
|
* bbts. This should only happen once. |
|
*/ |
|
if (update && td->reserved_block_code) |
|
nand_update_bbt(this, (loff_t)(block - 1) << |
|
this->bbt_erase_shift); |
|
} |
|
} |
|
|
|
/** |
|
* verify_bbt_descr - verify the bad block description |
|
* @this: the NAND device |
|
* @bd: the table to verify |
|
* |
|
* This functions performs a few sanity checks on the bad block description |
|
* table. |
|
*/ |
|
static void verify_bbt_descr(struct nand_chip *this, struct nand_bbt_descr *bd) |
|
{ |
|
u64 targetsize = nanddev_target_size(&this->base); |
|
struct mtd_info *mtd = nand_to_mtd(this); |
|
u32 pattern_len; |
|
u32 bits; |
|
u32 table_size; |
|
|
|
if (!bd) |
|
return; |
|
|
|
pattern_len = bd->len; |
|
bits = bd->options & NAND_BBT_NRBITS_MSK; |
|
|
|
BUG_ON((this->bbt_options & NAND_BBT_NO_OOB) && |
|
!(this->bbt_options & NAND_BBT_USE_FLASH)); |
|
BUG_ON(!bits); |
|
|
|
if (bd->options & NAND_BBT_VERSION) |
|
pattern_len++; |
|
|
|
if (bd->options & NAND_BBT_NO_OOB) { |
|
BUG_ON(!(this->bbt_options & NAND_BBT_USE_FLASH)); |
|
BUG_ON(!(this->bbt_options & NAND_BBT_NO_OOB)); |
|
BUG_ON(bd->offs); |
|
if (bd->options & NAND_BBT_VERSION) |
|
BUG_ON(bd->veroffs != bd->len); |
|
BUG_ON(bd->options & NAND_BBT_SAVECONTENT); |
|
} |
|
|
|
if (bd->options & NAND_BBT_PERCHIP) |
|
table_size = targetsize >> this->bbt_erase_shift; |
|
else |
|
table_size = mtd->size >> this->bbt_erase_shift; |
|
table_size >>= 3; |
|
table_size *= bits; |
|
if (bd->options & NAND_BBT_NO_OOB) |
|
table_size += pattern_len; |
|
BUG_ON(table_size > (1 << this->bbt_erase_shift)); |
|
} |
|
|
|
/** |
|
* nand_scan_bbt - [NAND Interface] scan, find, read and maybe create bad block table(s) |
|
* @this: the NAND device |
|
* @bd: descriptor for the good/bad block search pattern |
|
* |
|
* The function checks, if a bad block table(s) is/are already available. If |
|
* not it scans the device for manufacturer marked good / bad blocks and writes |
|
* the bad block table(s) to the selected place. |
|
* |
|
* The bad block table memory is allocated here. It must be freed by calling |
|
* the nand_free_bbt function. |
|
*/ |
|
static int nand_scan_bbt(struct nand_chip *this, struct nand_bbt_descr *bd) |
|
{ |
|
struct mtd_info *mtd = nand_to_mtd(this); |
|
int len, res; |
|
uint8_t *buf; |
|
struct nand_bbt_descr *td = this->bbt_td; |
|
struct nand_bbt_descr *md = this->bbt_md; |
|
|
|
len = (mtd->size >> (this->bbt_erase_shift + 2)) ? : 1; |
|
/* |
|
* Allocate memory (2bit per block) and clear the memory bad block |
|
* table. |
|
*/ |
|
this->bbt = kzalloc(len, GFP_KERNEL); |
|
if (!this->bbt) |
|
return -ENOMEM; |
|
|
|
/* |
|
* If no primary table descriptor is given, scan the device to build a |
|
* memory based bad block table. |
|
*/ |
|
if (!td) { |
|
if ((res = nand_memory_bbt(this, bd))) { |
|
pr_err("nand_bbt: can't scan flash and build the RAM-based BBT\n"); |
|
goto err_free_bbt; |
|
} |
|
return 0; |
|
} |
|
verify_bbt_descr(this, td); |
|
verify_bbt_descr(this, md); |
|
|
|
/* Allocate a temporary buffer for one eraseblock incl. oob */ |
|
len = (1 << this->bbt_erase_shift); |
|
len += (len >> this->page_shift) * mtd->oobsize; |
|
buf = vmalloc(len); |
|
if (!buf) { |
|
res = -ENOMEM; |
|
goto err_free_bbt; |
|
} |
|
|
|
/* Is the bbt at a given page? */ |
|
if (td->options & NAND_BBT_ABSPAGE) { |
|
read_abs_bbts(this, buf, td, md); |
|
} else { |
|
/* Search the bad block table using a pattern in oob */ |
|
search_read_bbts(this, buf, td, md); |
|
} |
|
|
|
res = check_create(this, buf, bd); |
|
if (res) |
|
goto err_free_buf; |
|
|
|
/* Prevent the bbt regions from erasing / writing */ |
|
mark_bbt_region(this, td); |
|
if (md) |
|
mark_bbt_region(this, md); |
|
|
|
vfree(buf); |
|
return 0; |
|
|
|
err_free_buf: |
|
vfree(buf); |
|
err_free_bbt: |
|
kfree(this->bbt); |
|
this->bbt = NULL; |
|
return res; |
|
} |
|
|
|
/* |
|
* Define some generic bad / good block scan pattern which are used |
|
* while scanning a device for factory marked good / bad blocks. |
|
*/ |
|
static uint8_t scan_ff_pattern[] = { 0xff, 0xff }; |
|
|
|
/* Generic flash bbt descriptors */ |
|
static uint8_t bbt_pattern[] = {'B', 'b', 't', '0' }; |
|
static uint8_t mirror_pattern[] = {'1', 't', 'b', 'B' }; |
|
|
|
static struct nand_bbt_descr bbt_main_descr = { |
|
.options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
|
| NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP, |
|
.offs = 8, |
|
.len = 4, |
|
.veroffs = 12, |
|
.maxblocks = NAND_BBT_SCAN_MAXBLOCKS, |
|
.pattern = bbt_pattern |
|
}; |
|
|
|
static struct nand_bbt_descr bbt_mirror_descr = { |
|
.options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
|
| NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP, |
|
.offs = 8, |
|
.len = 4, |
|
.veroffs = 12, |
|
.maxblocks = NAND_BBT_SCAN_MAXBLOCKS, |
|
.pattern = mirror_pattern |
|
}; |
|
|
|
static struct nand_bbt_descr bbt_main_no_oob_descr = { |
|
.options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
|
| NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP |
|
| NAND_BBT_NO_OOB, |
|
.len = 4, |
|
.veroffs = 4, |
|
.maxblocks = NAND_BBT_SCAN_MAXBLOCKS, |
|
.pattern = bbt_pattern |
|
}; |
|
|
|
static struct nand_bbt_descr bbt_mirror_no_oob_descr = { |
|
.options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
|
| NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP |
|
| NAND_BBT_NO_OOB, |
|
.len = 4, |
|
.veroffs = 4, |
|
.maxblocks = NAND_BBT_SCAN_MAXBLOCKS, |
|
.pattern = mirror_pattern |
|
}; |
|
|
|
#define BADBLOCK_SCAN_MASK (~NAND_BBT_NO_OOB) |
|
/** |
|
* nand_create_badblock_pattern - [INTERN] Creates a BBT descriptor structure |
|
* @this: NAND chip to create descriptor for |
|
* |
|
* This function allocates and initializes a nand_bbt_descr for BBM detection |
|
* based on the properties of @this. The new descriptor is stored in |
|
* this->badblock_pattern. Thus, this->badblock_pattern should be NULL when |
|
* passed to this function. |
|
*/ |
|
static int nand_create_badblock_pattern(struct nand_chip *this) |
|
{ |
|
struct nand_bbt_descr *bd; |
|
if (this->badblock_pattern) { |
|
pr_warn("Bad block pattern already allocated; not replacing\n"); |
|
return -EINVAL; |
|
} |
|
bd = kzalloc(sizeof(*bd), GFP_KERNEL); |
|
if (!bd) |
|
return -ENOMEM; |
|
bd->options = this->bbt_options & BADBLOCK_SCAN_MASK; |
|
bd->offs = this->badblockpos; |
|
bd->len = (this->options & NAND_BUSWIDTH_16) ? 2 : 1; |
|
bd->pattern = scan_ff_pattern; |
|
bd->options |= NAND_BBT_DYNAMICSTRUCT; |
|
this->badblock_pattern = bd; |
|
return 0; |
|
} |
|
|
|
/** |
|
* nand_create_bbt - [NAND Interface] Select a default bad block table for the device |
|
* @this: NAND chip object |
|
* |
|
* This function selects the default bad block table support for the device and |
|
* calls the nand_scan_bbt function. |
|
*/ |
|
int nand_create_bbt(struct nand_chip *this) |
|
{ |
|
int ret; |
|
|
|
/* Is a flash based bad block table requested? */ |
|
if (this->bbt_options & NAND_BBT_USE_FLASH) { |
|
/* Use the default pattern descriptors */ |
|
if (!this->bbt_td) { |
|
if (this->bbt_options & NAND_BBT_NO_OOB) { |
|
this->bbt_td = &bbt_main_no_oob_descr; |
|
this->bbt_md = &bbt_mirror_no_oob_descr; |
|
} else { |
|
this->bbt_td = &bbt_main_descr; |
|
this->bbt_md = &bbt_mirror_descr; |
|
} |
|
} |
|
} else { |
|
this->bbt_td = NULL; |
|
this->bbt_md = NULL; |
|
} |
|
|
|
if (!this->badblock_pattern) { |
|
ret = nand_create_badblock_pattern(this); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
return nand_scan_bbt(this, this->badblock_pattern); |
|
} |
|
EXPORT_SYMBOL(nand_create_bbt); |
|
|
|
/** |
|
* nand_isreserved_bbt - [NAND Interface] Check if a block is reserved |
|
* @this: NAND chip object |
|
* @offs: offset in the device |
|
*/ |
|
int nand_isreserved_bbt(struct nand_chip *this, loff_t offs) |
|
{ |
|
int block; |
|
|
|
block = (int)(offs >> this->bbt_erase_shift); |
|
return bbt_get_entry(this, block) == BBT_BLOCK_RESERVED; |
|
} |
|
|
|
/** |
|
* nand_isbad_bbt - [NAND Interface] Check if a block is bad |
|
* @this: NAND chip object |
|
* @offs: offset in the device |
|
* @allowbbt: allow access to bad block table region |
|
*/ |
|
int nand_isbad_bbt(struct nand_chip *this, loff_t offs, int allowbbt) |
|
{ |
|
int block, res; |
|
|
|
block = (int)(offs >> this->bbt_erase_shift); |
|
res = bbt_get_entry(this, block); |
|
|
|
pr_debug("nand_isbad_bbt(): bbt info for offs 0x%08x: (block %d) 0x%02x\n", |
|
(unsigned int)offs, block, res); |
|
|
|
switch (res) { |
|
case BBT_BLOCK_GOOD: |
|
return 0; |
|
case BBT_BLOCK_WORN: |
|
return 1; |
|
case BBT_BLOCK_RESERVED: |
|
return allowbbt ? 0 : 1; |
|
} |
|
return 1; |
|
} |
|
|
|
/** |
|
* nand_markbad_bbt - [NAND Interface] Mark a block bad in the BBT |
|
* @this: NAND chip object |
|
* @offs: offset of the bad block |
|
*/ |
|
int nand_markbad_bbt(struct nand_chip *this, loff_t offs) |
|
{ |
|
int block, ret = 0; |
|
|
|
block = (int)(offs >> this->bbt_erase_shift); |
|
|
|
/* Mark bad block in memory */ |
|
bbt_mark_entry(this, block, BBT_BLOCK_WORN); |
|
|
|
/* Update flash-based bad block table */ |
|
if (this->bbt_options & NAND_BBT_USE_FLASH) |
|
ret = nand_update_bbt(this, offs); |
|
|
|
return ret; |
|
}
|
|
|