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https://github.com/brain-hackers/u-boot-brain
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1053 lines
30 KiB
C
1053 lines
30 KiB
C
/*
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* drivers/mtd/nand_bbt.c
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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 (C) 2004 Thomas Gleixner (tglx@linutronix.de)
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*
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* $Id: nand_bbt.c,v 1.28 2004/11/13 10:19:09 gleixner Exp $
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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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 a bbt is found
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* then the contents are read and the memory based bbt is created. If a
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* mirrored bbt is selected then the mirror is searched too and the
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* versions are compared. If the mirror has a greater version number
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* than 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* If one of the bbt's is out of date or does not exist it is (re)created.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 autogenerated 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.
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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 neccecary for a bbt in FLASH does not exceed a block boundary
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*
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*/
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#include <common.h>
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#if (CONFIG_COMMANDS & CFG_CMD_NAND) && !defined(CFG_NAND_LEGACY)
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#include <malloc.h>
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#include <linux/mtd/compat.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/nand.h>
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#include <asm/errno.h>
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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
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* tables and good / bad block identifiers.
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* If the SCAN_EMPTY option is set then check, if all bytes except the
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* pattern area contain 0xff
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*
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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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int i, end;
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uint8_t *p = buf;
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end = paglen + td->offs;
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if (td->options & NAND_BBT_SCANEMPTY) {
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for (i = 0; i < end; i++) {
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if (p[i] != 0xff)
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return -1;
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}
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}
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p += end;
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/* Compare the pattern */
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for (i = 0; i < td->len; i++) {
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if (p[i] != td->pattern[i])
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return -1;
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}
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p += td->len;
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end += td->len;
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if (td->options & NAND_BBT_SCANEMPTY) {
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for (i = end; i < len; i++) {
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if (*p++ != 0xff)
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return -1;
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}
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}
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return 0;
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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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* @mtd: MTD device structure
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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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* @bits: number of bits per block
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* @offs: offset in the memory table
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* @reserved_block_code: Pattern to identify reserved blocks
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*
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* Read the bad block table starting from page.
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*
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*/
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static int read_bbt (struct mtd_info *mtd, uint8_t *buf, int page, int num,
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int bits, int offs, int reserved_block_code)
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{
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int res, i, j, act = 0;
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struct nand_chip *this = mtd->priv;
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size_t retlen, len, totlen;
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loff_t from;
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uint8_t msk = (uint8_t) ((1 << bits) - 1);
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totlen = (num * bits) >> 3;
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from = ((loff_t)page) << this->page_shift;
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while (totlen) {
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len = min (totlen, (size_t) (1 << this->bbt_erase_shift));
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res = mtd->read_ecc (mtd, from, len, &retlen, buf, NULL, this->autooob);
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if (res < 0) {
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if (retlen != len) {
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printk (KERN_INFO "nand_bbt: Error reading bad block table\n");
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return res;
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}
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printk (KERN_WARNING "nand_bbt: ECC error while reading bad block table\n");
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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 += 2) {
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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 &&
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(tmp == reserved_block_code)) {
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printk (KERN_DEBUG "nand_read_bbt: Reserved block at 0x%08x\n",
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((offs << 2) + (act >> 1)) << this->bbt_erase_shift);
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this->bbt[offs + (act >> 3)] |= 0x2 << (act & 0x06);
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continue;
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}
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/* Leave it for now, if its matured we can move this
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* message to MTD_DEBUG_LEVEL0 */
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printk (KERN_DEBUG "nand_read_bbt: Bad block at 0x%08x\n",
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((offs << 2) + (act >> 1)) << 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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this->bbt[offs + (act >> 3)] |= 0x3 << (act & 0x06);
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else
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this->bbt[offs + (act >> 3)] |= 0x1 << (act & 0x06);
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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 0;
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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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* @mtd: MTD device structure
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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.
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* Applies only if 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
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* We assume that the bbt bits are in consecutive order.
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*/
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static int read_abs_bbt (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td, int chip)
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{
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struct nand_chip *this = mtd->priv;
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int res = 0, i;
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int bits;
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bits = td->options & NAND_BBT_NRBITS_MSK;
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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 < this->numchips; i++) {
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if (chip == -1 || chip == i)
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res = read_bbt (mtd, buf, td->pages[i], this->chipsize >> this->bbt_erase_shift, bits, offs, td->reserved_block_code);
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if (res)
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return res;
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offs += this->chipsize >> (this->bbt_erase_shift + 2);
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}
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} else {
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res = read_bbt (mtd, buf, td->pages[0], mtd->size >> this->bbt_erase_shift, bits, 0, td->reserved_block_code);
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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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* read_abs_bbts - [GENERIC] Read the bad block table(s) for all chips starting at a given page
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* @mtd: MTD device structure
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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
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* We assume that the bbt bits are in consecutive order.
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*
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*/
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static int read_abs_bbts (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td,
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struct nand_bbt_descr *md)
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{
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struct nand_chip *this = mtd->priv;
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/* Read the primary version, if available */
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if (td->options & NAND_BBT_VERSION) {
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nand_read_raw (mtd, buf, td->pages[0] << this->page_shift, mtd->oobblock, mtd->oobsize);
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td->version[0] = buf[mtd->oobblock + td->veroffs];
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printk (KERN_DEBUG "Bad block table at page %d, version 0x%02X\n", 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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nand_read_raw (mtd, buf, md->pages[0] << this->page_shift, mtd->oobblock, mtd->oobsize);
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md->version[0] = buf[mtd->oobblock + md->veroffs];
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printk (KERN_DEBUG "Bad block table at page %d, version 0x%02X\n", md->pages[0], md->version[0]);
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}
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return 1;
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}
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/**
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* create_bbt - [GENERIC] Create a bad block table by scanning the device
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* @mtd: MTD device structure
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* @buf: temporary buffer
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* @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.
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* Applies only if NAND_BBT_PERCHIP option is set
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*
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* Create a bad block table by scanning the device
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* for the given good/bad block identify pattern
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*/
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static void create_bbt (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *bd, int chip)
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{
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struct nand_chip *this = mtd->priv;
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int i, j, numblocks, len, scanlen;
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int startblock;
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loff_t from;
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size_t readlen, ooblen;
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if (bd->options & NAND_BBT_SCANALLPAGES)
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len = 1 << (this->bbt_erase_shift - this->page_shift);
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else {
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if (bd->options & NAND_BBT_SCAN2NDPAGE)
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len = 2;
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else
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len = 1;
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}
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scanlen = mtd->oobblock + mtd->oobsize;
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readlen = len * mtd->oobblock;
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ooblen = len * mtd->oobsize;
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if (chip == -1) {
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/* Note that numblocks is 2 * (real numblocks) here, see i+=2 below as it
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* makes shifting and masking less painful */
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numblocks = mtd->size >> (this->bbt_erase_shift - 1);
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startblock = 0;
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from = 0;
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} else {
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if (chip >= this->numchips) {
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printk (KERN_WARNING "create_bbt(): chipnr (%d) > available chips (%d)\n",
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chip + 1, this->numchips);
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return;
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}
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numblocks = this->chipsize >> (this->bbt_erase_shift - 1);
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startblock = chip * numblocks;
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numblocks += startblock;
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from = startblock << (this->bbt_erase_shift - 1);
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}
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for (i = startblock; i < numblocks;) {
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nand_read_raw (mtd, buf, from, readlen, ooblen);
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for (j = 0; j < len; j++) {
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if (check_pattern (&buf[j * scanlen], scanlen, mtd->oobblock, bd)) {
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this->bbt[i >> 3] |= 0x03 << (i & 0x6);
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break;
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}
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}
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i += 2;
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from += (1 << this->bbt_erase_shift);
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}
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}
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/**
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* search_bbt - [GENERIC] scan the device for a specific bad block table
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* @mtd: MTD device structure
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* @buf: temporary buffer
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* @td: descriptor for the bad block table
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*
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* Read the bad block table by searching for a given ident pattern.
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* Search is preformed either from the beginning up or from the end of
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* the device downwards. The search starts always at the start of a
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* block.
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* If the option NAND_BBT_PERCHIP is given, each chip is searched
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* for a bbt, which contains the bad block information of this chip.
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* This is neccecary to provide support for certain DOC devices.
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*
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* The bbt ident pattern resides in the oob area of the first page
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* in a block.
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*/
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static int search_bbt (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td)
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{
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struct nand_chip *this = mtd->priv;
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int i, chips;
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int bits, startblock, block, dir;
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int scanlen = mtd->oobblock + mtd->oobsize;
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int bbtblocks;
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/* Search direction top -> down ? */
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if (td->options & NAND_BBT_LASTBLOCK) {
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startblock = (mtd->size >> this->bbt_erase_shift) -1;
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dir = -1;
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} else {
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startblock = 0;
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dir = 1;
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}
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/* Do we have a bbt per chip ? */
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if (td->options & NAND_BBT_PERCHIP) {
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chips = this->numchips;
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bbtblocks = this->chipsize >> this->bbt_erase_shift;
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startblock &= bbtblocks - 1;
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} else {
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chips = 1;
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bbtblocks = mtd->size >> this->bbt_erase_shift;
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}
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/* Number of bits for each erase block in the bbt */
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bits = td->options & NAND_BBT_NRBITS_MSK;
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for (i = 0; i < chips; i++) {
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/* Reset version information */
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td->version[i] = 0;
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td->pages[i] = -1;
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/* Scan the maximum number of blocks */
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for (block = 0; block < td->maxblocks; block++) {
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int actblock = startblock + dir * block;
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/* Read first page */
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nand_read_raw (mtd, buf, actblock << this->bbt_erase_shift, mtd->oobblock, mtd->oobsize);
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if (!check_pattern(buf, scanlen, mtd->oobblock, td)) {
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td->pages[i] = actblock << (this->bbt_erase_shift - this->page_shift);
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if (td->options & NAND_BBT_VERSION) {
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td->version[i] = buf[mtd->oobblock + td->veroffs];
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}
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break;
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}
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}
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startblock += this->chipsize >> this->bbt_erase_shift;
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}
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/* Check, if we found a bbt for each requested chip */
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for (i = 0; i < chips; i++) {
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if (td->pages[i] == -1)
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printk (KERN_WARNING "Bad block table not found for chip %d\n", i);
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else
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printk (KERN_DEBUG "Bad block table found at page %d, version 0x%02X\n", td->pages[i], td->version[i]);
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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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* search_read_bbts - [GENERIC] scan the device for bad block table(s)
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* @mtd: MTD device structure
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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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* Search and read the bad block table(s)
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*/
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static int search_read_bbts (struct mtd_info *mtd, 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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/* Search the primary table */
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search_bbt (mtd, buf, td);
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/* Search the mirror table */
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if (md)
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search_bbt (mtd, buf, md);
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/* Force result check */
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return 1;
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}
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/**
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* write_bbt - [GENERIC] (Re)write the bad block table
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*
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* @mtd: MTD device structure
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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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* @chipsel: selector for a specific chip, -1 for all
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*
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* (Re)write the bad block table
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*
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*/
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static int write_bbt (struct mtd_info *mtd, uint8_t *buf,
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struct nand_bbt_descr *td, struct nand_bbt_descr *md, int chipsel)
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{
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struct nand_chip *this = mtd->priv;
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struct nand_oobinfo oobinfo;
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struct erase_info einfo;
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int i, j, res, chip = 0;
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int bits, startblock, dir, page, offs, numblocks, sft, sftmsk;
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int nrchips, bbtoffs, pageoffs;
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uint8_t msk[4];
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uint8_t rcode = td->reserved_block_code;
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size_t retlen, len = 0;
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loff_t to;
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if (!rcode)
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rcode = 0xff;
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/* Write bad block table per chip rather than per device ? */
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if (td->options & NAND_BBT_PERCHIP) {
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numblocks = (int) (this->chipsize >> this->bbt_erase_shift);
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/* Full device write or specific chip ? */
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if (chipsel == -1) {
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nrchips = this->numchips;
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} else {
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nrchips = chipsel + 1;
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chip = chipsel;
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}
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} else {
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numblocks = (int) (mtd->size >> this->bbt_erase_shift);
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nrchips = 1;
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}
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|
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/* Loop through the chips */
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for (; chip < nrchips; chip++) {
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|
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/* There was already a version of the table, reuse the page
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* This applies for absolute placement too, as we have the
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* page nr. in td->pages.
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*/
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if (td->pages[chip] != -1) {
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page = td->pages[chip];
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goto write;
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}
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|
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/* Automatic placement of the bad block table */
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/* Search direction top -> down ? */
|
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if (td->options & NAND_BBT_LASTBLOCK) {
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startblock = numblocks * (chip + 1) - 1;
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|
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 ((this->bbt[block >> 2] >> (2 * (block & 0x03))) & 0x03) {
|
|
case 0x01:
|
|
case 0x03:
|
|
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)
|
|
goto write;
|
|
}
|
|
printk (KERN_ERR "No space left to write bad block table\n");
|
|
return -ENOSPC;
|
|
write:
|
|
|
|
/* Set up shift count and masks for the flash table */
|
|
bits = td->options & NAND_BBT_NRBITS_MSK;
|
|
switch (bits) {
|
|
case 1: sft = 3; sftmsk = 0x07; msk[0] = 0x00; msk[1] = 0x01; msk[2] = ~rcode; msk[3] = 0x01; break;
|
|
case 2: sft = 2; sftmsk = 0x06; msk[0] = 0x00; msk[1] = 0x01; msk[2] = ~rcode; msk[3] = 0x03; break;
|
|
case 4: sft = 1; sftmsk = 0x04; msk[0] = 0x00; msk[1] = 0x0C; msk[2] = ~rcode; msk[3] = 0x0f; break;
|
|
case 8: sft = 0; sftmsk = 0x00; msk[0] = 0x00; msk[1] = 0x0F; msk[2] = ~rcode; msk[3] = 0xff; break;
|
|
default: return -EINVAL;
|
|
}
|
|
|
|
bbtoffs = chip * (numblocks >> 2);
|
|
|
|
to = ((loff_t) page) << this->page_shift;
|
|
|
|
memcpy (&oobinfo, this->autooob, sizeof(oobinfo));
|
|
oobinfo.useecc = MTD_NANDECC_PLACEONLY;
|
|
|
|
/* 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_ecc (mtd, to, len, &retlen, buf, &buf[len], &oobinfo);
|
|
if (res < 0) {
|
|
if (retlen != len) {
|
|
printk (KERN_INFO "nand_bbt: Error reading block for writing the bad block table\n");
|
|
return res;
|
|
}
|
|
printk (KERN_WARNING "nand_bbt: ECC error while reading block for writing bad block table\n");
|
|
}
|
|
/* 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));
|
|
/* Preset the bbt's oob area with 0xff */
|
|
memset (&buf[len + pageoffs * mtd->oobsize], 0xff,
|
|
((len >> this->page_shift) - pageoffs) * mtd->oobsize);
|
|
if (td->options & NAND_BBT_VERSION) {
|
|
buf[len + (pageoffs * mtd->oobsize) + td->veroffs] = td->version[chip];
|
|
}
|
|
} else {
|
|
/* Calc length */
|
|
len = (size_t) (numblocks >> sft);
|
|
/* Make it page aligned ! */
|
|
len = (len + (mtd->oobblock-1)) & ~(mtd->oobblock-1);
|
|
/* Preset the buffer with 0xff */
|
|
memset (buf, 0xff, len + (len >> this->page_shift) * mtd->oobsize);
|
|
offs = 0;
|
|
/* Pattern is located in oob area of first page */
|
|
memcpy (&buf[len + td->offs], td->pattern, td->len);
|
|
if (td->options & NAND_BBT_VERSION) {
|
|
buf[len + td->veroffs] = td->version[chip];
|
|
}
|
|
}
|
|
|
|
/* walk through the memory table */
|
|
for (i = 0; i < numblocks; ) {
|
|
uint8_t dat;
|
|
dat = this->bbt[bbtoffs + (i >> 2)];
|
|
for (j = 0; j < 4; j++ , i++) {
|
|
int sftcnt = (i << (3 - sft)) & sftmsk;
|
|
/* Do not store the reserved bbt blocks ! */
|
|
buf[offs + (i >> sft)] &= ~(msk[dat & 0x03] << sftcnt);
|
|
dat >>= 2;
|
|
}
|
|
}
|
|
|
|
memset (&einfo, 0, sizeof (einfo));
|
|
einfo.mtd = mtd;
|
|
einfo.addr = (unsigned long) to;
|
|
einfo.len = 1 << this->bbt_erase_shift;
|
|
res = nand_erase_nand (mtd, &einfo, 1);
|
|
if (res < 0) {
|
|
printk (KERN_WARNING "nand_bbt: Error during block erase: %d\n", res);
|
|
return res;
|
|
}
|
|
|
|
res = mtd->write_ecc (mtd, to, len, &retlen, buf, &buf[len], &oobinfo);
|
|
if (res < 0) {
|
|
printk (KERN_WARNING "nand_bbt: Error while writing bad block table %d\n", res);
|
|
return res;
|
|
}
|
|
printk (KERN_DEBUG "Bad block table written to 0x%08x, version 0x%02X\n",
|
|
(unsigned int) to, td->version[chip]);
|
|
|
|
/* Mark it as used */
|
|
td->pages[chip] = page;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* nand_memory_bbt - [GENERIC] create a memory based bad block table
|
|
* @mtd: MTD device structure
|
|
* @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 int nand_memory_bbt (struct mtd_info *mtd, struct nand_bbt_descr *bd)
|
|
{
|
|
struct nand_chip *this = mtd->priv;
|
|
|
|
/* Ensure that we only scan for the pattern and nothing else */
|
|
bd->options = 0;
|
|
create_bbt (mtd, this->data_buf, bd, -1);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* check_create - [GENERIC] create and write bbt(s) if neccecary
|
|
* @mtd: MTD device structure
|
|
* @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 neccecary
|
|
* Creation is neccecary if no bbt was found for the chip/device
|
|
* Update is neccecary if one of the tables is missing or the
|
|
* version nr. of one table is less than the other
|
|
*/
|
|
static int check_create (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *bd)
|
|
{
|
|
int i, chips, writeops, chipsel, res;
|
|
struct nand_chip *this = mtd->priv;
|
|
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 = this->numchips;
|
|
else
|
|
chips = 1;
|
|
|
|
for (i = 0; i < chips; i++) {
|
|
writeops = 0;
|
|
rd = NULL;
|
|
rd2 = NULL;
|
|
/* Per chip or per device ? */
|
|
chipsel = (td->options & NAND_BBT_PERCHIP) ? i : -1;
|
|
/* Mirrored table avilable ? */
|
|
if (md) {
|
|
if (td->pages[i] == -1 && md->pages[i] == -1) {
|
|
writeops = 0x03;
|
|
goto create;
|
|
}
|
|
|
|
if (td->pages[i] == -1) {
|
|
rd = md;
|
|
td->version[i] = md->version[i];
|
|
writeops = 1;
|
|
goto writecheck;
|
|
}
|
|
|
|
if (md->pages[i] == -1) {
|
|
rd = td;
|
|
md->version[i] = td->version[i];
|
|
writeops = 2;
|
|
goto writecheck;
|
|
}
|
|
|
|
if (td->version[i] == md->version[i]) {
|
|
rd = td;
|
|
if (!(td->options & NAND_BBT_VERSION))
|
|
rd2 = md;
|
|
goto writecheck;
|
|
}
|
|
|
|
if (((int8_t) (td->version[i] - md->version[i])) > 0) {
|
|
rd = td;
|
|
md->version[i] = td->version[i];
|
|
writeops = 2;
|
|
} else {
|
|
rd = md;
|
|
td->version[i] = md->version[i];
|
|
writeops = 1;
|
|
}
|
|
|
|
goto writecheck;
|
|
|
|
} else {
|
|
if (td->pages[i] == -1) {
|
|
writeops = 0x01;
|
|
goto create;
|
|
}
|
|
rd = td;
|
|
goto writecheck;
|
|
}
|
|
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) */
|
|
create_bbt (mtd, buf, bd, chipsel);
|
|
|
|
td->version[i] = 1;
|
|
if (md)
|
|
md->version[i] = 1;
|
|
writecheck:
|
|
/* read back first ? */
|
|
if (rd)
|
|
read_abs_bbt (mtd, buf, rd, chipsel);
|
|
/* If they weren't versioned, read both. */
|
|
if (rd2)
|
|
read_abs_bbt (mtd, buf, rd2, chipsel);
|
|
|
|
/* Write the bad block table to the device ? */
|
|
if ((writeops & 0x01) && (td->options & NAND_BBT_WRITE)) {
|
|
res = write_bbt (mtd, 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 (mtd, buf, md, td, chipsel);
|
|
if (res < 0)
|
|
return res;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* mark_bbt_regions - [GENERIC] mark the bad block table regions
|
|
* @mtd: MTD device structure
|
|
* @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 mtd_info *mtd, struct nand_bbt_descr *td)
|
|
{
|
|
struct nand_chip *this = mtd->priv;
|
|
int i, j, chips, block, nrblocks, update;
|
|
uint8_t oldval, newval;
|
|
|
|
/* Do we have a bbt per chip ? */
|
|
if (td->options & NAND_BBT_PERCHIP) {
|
|
chips = this->numchips;
|
|
nrblocks = (int)(this->chipsize >> 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);
|
|
block <<= 1;
|
|
oldval = this->bbt[(block >> 3)];
|
|
newval = oldval | (0x2 << (block & 0x06));
|
|
this->bbt[(block >> 3)] = newval;
|
|
if ((oldval != newval) && td->reserved_block_code)
|
|
nand_update_bbt(mtd, block << (this->bbt_erase_shift - 1));
|
|
continue;
|
|
}
|
|
update = 0;
|
|
if (td->options & NAND_BBT_LASTBLOCK)
|
|
block = ((i + 1) * nrblocks) - td->maxblocks;
|
|
else
|
|
block = i * nrblocks;
|
|
block <<= 1;
|
|
for (j = 0; j < td->maxblocks; j++) {
|
|
oldval = this->bbt[(block >> 3)];
|
|
newval = oldval | (0x2 << (block & 0x06));
|
|
this->bbt[(block >> 3)] = newval;
|
|
if (oldval != newval) update = 1;
|
|
block += 2;
|
|
}
|
|
/* 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(mtd, (block - 2) << (this->bbt_erase_shift - 1));
|
|
}
|
|
}
|
|
|
|
/**
|
|
* nand_scan_bbt - [NAND Interface] scan, find, read and maybe create bad block table(s)
|
|
* @mtd: MTD device structure
|
|
* @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.
|
|
*
|
|
*/
|
|
int nand_scan_bbt (struct mtd_info *mtd, struct nand_bbt_descr *bd)
|
|
{
|
|
struct nand_chip *this = mtd->priv;
|
|
int len, res = 0;
|
|
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);
|
|
/* Allocate memory (2bit per block) */
|
|
this->bbt = kmalloc (len, GFP_KERNEL);
|
|
if (!this->bbt) {
|
|
printk (KERN_ERR "nand_scan_bbt: Out of memory\n");
|
|
return -ENOMEM;
|
|
}
|
|
/* Clear the memory bad block table */
|
|
memset (this->bbt, 0x00, len);
|
|
|
|
/* If no primary table decriptor is given, scan the device
|
|
* to build a memory based bad block table
|
|
*/
|
|
if (!td)
|
|
return nand_memory_bbt(mtd, bd);
|
|
|
|
/* 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) {
|
|
printk (KERN_ERR "nand_bbt: Out of memory\n");
|
|
kfree (this->bbt);
|
|
this->bbt = NULL;
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* Is the bbt at a given page ? */
|
|
if (td->options & NAND_BBT_ABSPAGE) {
|
|
res = read_abs_bbts (mtd, buf, td, md);
|
|
} else {
|
|
/* Search the bad block table using a pattern in oob */
|
|
res = search_read_bbts (mtd, buf, td, md);
|
|
}
|
|
|
|
if (res)
|
|
res = check_create (mtd, buf, bd);
|
|
|
|
/* Prevent the bbt regions from erasing / writing */
|
|
mark_bbt_region (mtd, td);
|
|
if (md)
|
|
mark_bbt_region (mtd, md);
|
|
|
|
kfree (buf);
|
|
return res;
|
|
}
|
|
|
|
|
|
/**
|
|
* nand_update_bbt - [NAND Interface] update bad block table(s)
|
|
* @mtd: MTD device structure
|
|
* @offs: the offset of the newly marked block
|
|
*
|
|
* The function updates the bad block table(s)
|
|
*/
|
|
int nand_update_bbt (struct mtd_info *mtd, loff_t offs)
|
|
{
|
|
struct nand_chip *this = mtd->priv;
|
|
int len, res = 0, writeops = 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;
|
|
|
|
len = mtd->size >> (this->bbt_erase_shift + 2);
|
|
/* 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) {
|
|
printk (KERN_ERR "nand_update_bbt: Out of memory\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
writeops = md != NULL ? 0x03 : 0x01;
|
|
|
|
/* 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 ((writeops & 0x01) && (td->options & NAND_BBT_WRITE)) {
|
|
res = write_bbt (mtd, buf, td, md, chipsel);
|
|
if (res < 0)
|
|
goto out;
|
|
}
|
|
/* Write the mirror bad block table to the device ? */
|
|
if ((writeops & 0x02) && md && (md->options & NAND_BBT_WRITE)) {
|
|
res = write_bbt (mtd, buf, md, td, chipsel);
|
|
}
|
|
|
|
out:
|
|
kfree (buf);
|
|
return res;
|
|
}
|
|
|
|
/* Define some generic bad / good block scan pattern which are used
|
|
* while scanning a device for factory marked good / bad blocks
|
|
*
|
|
* The memory based patterns just
|
|
*/
|
|
static uint8_t scan_ff_pattern[] = { 0xff, 0xff };
|
|
|
|
static struct nand_bbt_descr smallpage_memorybased = {
|
|
.options = 0,
|
|
.offs = 5,
|
|
.len = 1,
|
|
.pattern = scan_ff_pattern
|
|
};
|
|
|
|
static struct nand_bbt_descr largepage_memorybased = {
|
|
.options = 0,
|
|
.offs = 0,
|
|
.len = 2,
|
|
.pattern = scan_ff_pattern
|
|
};
|
|
|
|
static struct nand_bbt_descr smallpage_flashbased = {
|
|
.options = NAND_BBT_SCANEMPTY | NAND_BBT_SCANALLPAGES,
|
|
.offs = 5,
|
|
.len = 1,
|
|
.pattern = scan_ff_pattern
|
|
};
|
|
|
|
static struct nand_bbt_descr largepage_flashbased = {
|
|
.options = NAND_BBT_SCANEMPTY | NAND_BBT_SCANALLPAGES,
|
|
.offs = 0,
|
|
.len = 2,
|
|
.pattern = scan_ff_pattern
|
|
};
|
|
|
|
static uint8_t scan_agand_pattern[] = { 0x1C, 0x71, 0xC7, 0x1C, 0x71, 0xC7 };
|
|
|
|
static struct nand_bbt_descr agand_flashbased = {
|
|
.options = NAND_BBT_SCANEMPTY | NAND_BBT_SCANALLPAGES,
|
|
.offs = 0x20,
|
|
.len = 6,
|
|
.pattern = scan_agand_pattern
|
|
};
|
|
|
|
/* Generic flash bbt decriptors
|
|
*/
|
|
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 = 4,
|
|
.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 = 4,
|
|
.pattern = mirror_pattern
|
|
};
|
|
|
|
/**
|
|
* nand_default_bbt - [NAND Interface] Select a default bad block table for the device
|
|
* @mtd: MTD device structure
|
|
*
|
|
* This function selects the default bad block table
|
|
* support for the device and calls the nand_scan_bbt function
|
|
*
|
|
*/
|
|
int nand_default_bbt (struct mtd_info *mtd)
|
|
{
|
|
struct nand_chip *this = mtd->priv;
|
|
|
|
/* Default for AG-AND. We must use a flash based
|
|
* bad block table as the devices have factory marked
|
|
* _good_ blocks. Erasing those blocks leads to loss
|
|
* of the good / bad information, so we _must_ store
|
|
* this information in a good / bad table during
|
|
* startup
|
|
*/
|
|
if (this->options & NAND_IS_AND) {
|
|
/* Use the default pattern descriptors */
|
|
if (!this->bbt_td) {
|
|
this->bbt_td = &bbt_main_descr;
|
|
this->bbt_md = &bbt_mirror_descr;
|
|
}
|
|
this->options |= NAND_USE_FLASH_BBT;
|
|
return nand_scan_bbt (mtd, &agand_flashbased);
|
|
}
|
|
|
|
|
|
/* Is a flash based bad block table requested ? */
|
|
if (this->options & NAND_USE_FLASH_BBT) {
|
|
/* Use the default pattern descriptors */
|
|
if (!this->bbt_td) {
|
|
this->bbt_td = &bbt_main_descr;
|
|
this->bbt_md = &bbt_mirror_descr;
|
|
}
|
|
if (!this->badblock_pattern) {
|
|
this->badblock_pattern = (mtd->oobblock > 512) ?
|
|
&largepage_flashbased : &smallpage_flashbased;
|
|
}
|
|
} else {
|
|
this->bbt_td = NULL;
|
|
this->bbt_md = NULL;
|
|
if (!this->badblock_pattern) {
|
|
this->badblock_pattern = (mtd->oobblock > 512) ?
|
|
&largepage_memorybased : &smallpage_memorybased;
|
|
}
|
|
}
|
|
return nand_scan_bbt (mtd, this->badblock_pattern);
|
|
}
|
|
|
|
/**
|
|
* nand_isbad_bbt - [NAND Interface] Check if a block is bad
|
|
* @mtd: MTD device structure
|
|
* @offs: offset in the device
|
|
* @allowbbt: allow access to bad block table region
|
|
*
|
|
*/
|
|
int nand_isbad_bbt (struct mtd_info *mtd, loff_t offs, int allowbbt)
|
|
{
|
|
struct nand_chip *this = mtd->priv;
|
|
int block;
|
|
uint8_t res;
|
|
|
|
/* Get block number * 2 */
|
|
block = (int) (offs >> (this->bbt_erase_shift - 1));
|
|
res = (this->bbt[block >> 3] >> (block & 0x06)) & 0x03;
|
|
|
|
DEBUG (MTD_DEBUG_LEVEL2, "nand_isbad_bbt(): bbt info for offs 0x%08x: (block %d) 0x%02x\n",
|
|
(unsigned int)offs, res, block >> 1);
|
|
|
|
switch ((int)res) {
|
|
case 0x00: return 0;
|
|
case 0x01: return 1;
|
|
case 0x02: return allowbbt ? 0 : 1;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
#endif
|