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authorJean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>2007-11-24 21:26:56 +0100
committerJean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>2007-11-25 23:28:52 +0100
commit59829cc189378c142c13d2aa8d9a897d8bef3961 (patch)
tree9db7b0647e82c7d3edbd33caa89a71eb4e123d0c /drivers/nand/nand_bbt.c
parent318c0b90431f2648552e5ade78833f42652ce859 (diff)
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drivers/mtd : move mtd drivers to drivers/mtd
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Diffstat (limited to 'drivers/nand/nand_bbt.c')
-rw-r--r--drivers/nand/nand_bbt.c1052
1 files changed, 0 insertions, 1052 deletions
diff --git a/drivers/nand/nand_bbt.c b/drivers/nand/nand_bbt.c
deleted file mode 100644
index 19a9bc2..0000000
--- a/drivers/nand/nand_bbt.c
+++ /dev/null
@@ -1,1052 +0,0 @@
-/*
- * drivers/mtd/nand_bbt.c
- *
- * Overview:
- * Bad block table support for the NAND driver
- *
- * Copyright (C) 2004 Thomas Gleixner (tglx@linutronix.de)
- *
- * $Id: nand_bbt.c,v 1.28 2004/11/13 10:19:09 gleixner Exp $
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * Description:
- *
- * When nand_scan_bbt is called, then it tries to find the bad block table
- * depending on the options in the bbt descriptor(s). If a bbt is found
- * then the contents are read and the memory based bbt is created. If a
- * mirrored bbt is selected then the mirror is searched too and the
- * versions are compared. If the mirror has a greater version number
- * than the mirror bbt is used to build the memory based bbt.
- * If the tables are not versioned, then we "or" the bad block information.
- * If one of the bbt's is out of date or does not exist it is (re)created.
- * If no bbt exists at all then the device is scanned for factory marked
- * good / bad blocks and the bad block tables are created.
- *
- * For manufacturer created bbts like the one found on M-SYS DOC devices
- * the bbt is searched and read but never created
- *
- * The autogenerated bad block table is located in the last good blocks
- * of the device. The table is mirrored, so it can be updated eventually.
- * The table is marked in the oob area with an ident pattern and a version
- * number which indicates which of both tables is more up to date.
- *
- * The table uses 2 bits per block
- * 11b: block is good
- * 00b: block is factory marked bad
- * 01b, 10b: block is marked bad due to wear
- *
- * The memory bad block table uses the following scheme:
- * 00b: block is good
- * 01b: block is marked bad due to wear
- * 10b: block is reserved (to protect the bbt area)
- * 11b: block is factory marked bad
- *
- * Multichip devices like DOC store the bad block info per floor.
- *
- * Following assumptions are made:
- * - bbts start at a page boundary, if autolocated on a block boundary
- * - the space neccecary for a bbt in FLASH does not exceed a block boundary
- *
- */
-
-#include <common.h>
-
-#if defined(CONFIG_CMD_NAND) && !defined(CFG_NAND_LEGACY)
-
-#include <malloc.h>
-#include <linux/mtd/compat.h>
-#include <linux/mtd/mtd.h>
-#include <linux/mtd/nand.h>
-
-#include <asm/errno.h>
-
-/**
- * check_pattern - [GENERIC] check if a pattern is in the buffer
- * @buf: the buffer to search
- * @len: the length of buffer to search
- * @paglen: the pagelength
- * @td: search pattern descriptor
- *
- * Check for a pattern at the given place. Used to search bad block
- * tables and good / bad block identifiers.
- * If the SCAN_EMPTY option is set then check, if all bytes except the
- * pattern area contain 0xff
- *
-*/
-static int check_pattern (uint8_t *buf, int len, int paglen, struct nand_bbt_descr *td)
-{
- int i, end;
- uint8_t *p = buf;
-
- end = paglen + td->offs;
- if (td->options & NAND_BBT_SCANEMPTY) {
- for (i = 0; i < end; i++) {
- if (p[i] != 0xff)
- return -1;
- }
- }
- p += end;
-
- /* Compare the pattern */
- for (i = 0; i < td->len; i++) {
- if (p[i] != td->pattern[i])
- return -1;
- }
-
- p += td->len;
- end += td->len;
- if (td->options & NAND_BBT_SCANEMPTY) {
- for (i = end; i < len; i++) {
- if (*p++ != 0xff)
- return -1;
- }
- }
- return 0;
-}
-
-/**
- * read_bbt - [GENERIC] Read the bad block table starting from page
- * @mtd: MTD device structure
- * @buf: temporary buffer
- * @page: the starting page
- * @num: the number of bbt descriptors to read
- * @bits: number of bits per block
- * @offs: offset in the memory table
- * @reserved_block_code: Pattern to identify reserved blocks
- *
- * Read the bad block table starting from page.
- *
- */
-static int read_bbt (struct mtd_info *mtd, uint8_t *buf, int page, int num,
- int bits, int offs, int reserved_block_code)
-{
- int res, i, j, act = 0;
- struct nand_chip *this = mtd->priv;
- size_t retlen, len, totlen;
- loff_t from;
- uint8_t msk = (uint8_t) ((1 << bits) - 1);
-
- totlen = (num * bits) >> 3;
- from = ((loff_t)page) << this->page_shift;
-
- while (totlen) {
- len = min (totlen, (size_t) (1 << this->bbt_erase_shift));
- res = mtd->read_ecc (mtd, from, len, &retlen, buf, NULL, this->autooob);
- if (res < 0) {
- if (retlen != len) {
- printk (KERN_INFO "nand_bbt: Error reading bad block table\n");
- return res;
- }
- printk (KERN_WARNING "nand_bbt: ECC error while reading bad block table\n");
- }
-
- /* Analyse data */
- for (i = 0; i < len; i++) {
- uint8_t dat = buf[i];
- for (j = 0; j < 8; j += bits, act += 2) {
- uint8_t tmp = (dat >> j) & msk;
- if (tmp == msk)
- continue;
- if (reserved_block_code &&
- (tmp == reserved_block_code)) {
- printk (KERN_DEBUG "nand_read_bbt: Reserved block at 0x%08x\n",
- ((offs << 2) + (act >> 1)) << this->bbt_erase_shift);
- this->bbt[offs + (act >> 3)] |= 0x2 << (act & 0x06);
- continue;
- }
- /* Leave it for now, if its matured we can move this
- * message to MTD_DEBUG_LEVEL0 */
- printk (KERN_DEBUG "nand_read_bbt: Bad block at 0x%08x\n",
- ((offs << 2) + (act >> 1)) << this->bbt_erase_shift);
- /* Factory marked bad or worn out ? */
- if (tmp == 0)
- this->bbt[offs + (act >> 3)] |= 0x3 << (act & 0x06);
- else
- this->bbt[offs + (act >> 3)] |= 0x1 << (act & 0x06);
- }
- }
- totlen -= len;
- from += len;
- }
- return 0;
-}
-
-/**
- * read_abs_bbt - [GENERIC] Read the bad block table starting at a given page
- * @mtd: MTD device structure
- * @buf: temporary buffer
- * @td: descriptor for the bad block table
- * @chip: read the table for a specific chip, -1 read all chips.
- * Applies only if NAND_BBT_PERCHIP option is set
- *
- * Read the bad block table for all chips starting at a given page
- * We assume that the bbt bits are in consecutive order.
-*/
-static int read_abs_bbt (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td, int chip)
-{
- struct nand_chip *this = mtd->priv;
- int res = 0, i;
- int bits;
-
- bits = td->options & NAND_BBT_NRBITS_MSK;
- if (td->options & NAND_BBT_PERCHIP) {
- int offs = 0;
- for (i = 0; i < this->numchips; i++) {
- if (chip == -1 || chip == i)
- res = read_bbt (mtd, buf, td->pages[i], this->chipsize >> this->bbt_erase_shift, bits, offs, td->reserved_block_code);
- if (res)
- return res;
- offs += this->chipsize >> (this->bbt_erase_shift + 2);
- }
- } else {
- res = read_bbt (mtd, buf, td->pages[0], mtd->size >> this->bbt_erase_shift, bits, 0, td->reserved_block_code);
- if (res)
- return res;
- }
- return 0;
-}
-
-/**
- * read_abs_bbts - [GENERIC] Read the bad block table(s) for all chips starting at a given page
- * @mtd: MTD device structure
- * @buf: temporary buffer
- * @td: descriptor for the bad block table
- * @md: descriptor for the bad block table mirror
- *
- * Read the bad block table(s) for all chips starting at a given page
- * We assume that the bbt bits are in consecutive order.
- *
-*/
-static int read_abs_bbts (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td,
- struct nand_bbt_descr *md)
-{
- struct nand_chip *this = mtd->priv;
-
- /* Read the primary version, if available */
- if (td->options & NAND_BBT_VERSION) {
- nand_read_raw (mtd, buf, td->pages[0] << this->page_shift, mtd->oobblock, mtd->oobsize);
- td->version[0] = buf[mtd->oobblock + td->veroffs];
- printk (KERN_DEBUG "Bad block table at page %d, version 0x%02X\n", td->pages[0], td->version[0]);
- }
-
- /* Read the mirror version, if available */
- if (md && (md->options & NAND_BBT_VERSION)) {
- nand_read_raw (mtd, buf, md->pages[0] << this->page_shift, mtd->oobblock, mtd->oobsize);
- md->version[0] = buf[mtd->oobblock + md->veroffs];
- printk (KERN_DEBUG "Bad block table at page %d, version 0x%02X\n", md->pages[0], md->version[0]);
- }
-
- return 1;
-}
-
-/**
- * create_bbt - [GENERIC] Create a bad block table by scanning the device
- * @mtd: MTD device structure
- * @buf: temporary buffer
- * @bd: descriptor for the good/bad block search pattern
- * @chip: create the table for a specific chip, -1 read all chips.
- * Applies only if NAND_BBT_PERCHIP option is set
- *
- * Create a bad block table by scanning the device
- * for the given good/bad block identify pattern
- */
-static void create_bbt (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *bd, int chip)
-{
- struct nand_chip *this = mtd->priv;
- int i, j, numblocks, len, scanlen;
- int startblock;
- loff_t from;
- size_t readlen, ooblen;
-
- if (bd->options & NAND_BBT_SCANALLPAGES)
- len = 1 << (this->bbt_erase_shift - this->page_shift);
- else {
- if (bd->options & NAND_BBT_SCAN2NDPAGE)
- len = 2;
- else
- len = 1;
- }
- scanlen = mtd->oobblock + mtd->oobsize;
- readlen = len * mtd->oobblock;
- ooblen = len * mtd->oobsize;
-
- if (chip == -1) {
- /* Note that numblocks is 2 * (real numblocks) here, see i+=2 below as it
- * makes shifting and masking less painful */
- numblocks = mtd->size >> (this->bbt_erase_shift - 1);
- startblock = 0;
- from = 0;
- } else {
- if (chip >= this->numchips) {
- printk (KERN_WARNING "create_bbt(): chipnr (%d) > available chips (%d)\n",
- chip + 1, this->numchips);
- return;
- }
- numblocks = this->chipsize >> (this->bbt_erase_shift - 1);
- startblock = chip * numblocks;
- numblocks += startblock;
- from = startblock << (this->bbt_erase_shift - 1);
- }
-
- for (i = startblock; i < numblocks;) {
- nand_read_raw (mtd, buf, from, readlen, ooblen);
- for (j = 0; j < len; j++) {
- if (check_pattern (&buf[j * scanlen], scanlen, mtd->oobblock, bd)) {
- this->bbt[i >> 3] |= 0x03 << (i & 0x6);
- break;
- }
- }
- i += 2;
- from += (1 << this->bbt_erase_shift);
- }
-}
-
-/**
- * search_bbt - [GENERIC] scan the device for a specific bad block table
- * @mtd: MTD device structure
- * @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 neccecary 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 mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td)
-{
- struct nand_chip *this = mtd->priv;
- int i, chips;
- int bits, startblock, block, dir;
- int scanlen = mtd->oobblock + mtd->oobsize;
- int bbtblocks;
-
- /* 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 = this->numchips;
- bbtblocks = this->chipsize >> this->bbt_erase_shift;
- startblock &= bbtblocks - 1;
- } else {
- chips = 1;
- bbtblocks = mtd->size >> this->bbt_erase_shift;
- }
-
- /* Number of bits for each erase block in the bbt */
- bits = td->options & NAND_BBT_NRBITS_MSK;
-
- 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;
- /* Read first page */
- nand_read_raw (mtd, buf, actblock << this->bbt_erase_shift, mtd->oobblock, mtd->oobsize);
- if (!check_pattern(buf, scanlen, mtd->oobblock, td)) {
- td->pages[i] = actblock << (this->bbt_erase_shift - this->page_shift);
- if (td->options & NAND_BBT_VERSION) {
- td->version[i] = buf[mtd->oobblock + td->veroffs];
- }
- break;
- }
- }
- startblock += this->chipsize >> 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)
- printk (KERN_WARNING "Bad block table not found for chip %d\n", i);
- else
- printk (KERN_DEBUG "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)
- * @mtd: MTD device structure
- * @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 int search_read_bbts (struct mtd_info *mtd, uint8_t *buf,
- struct nand_bbt_descr *td, struct nand_bbt_descr *md)
-{
- /* Search the primary table */
- search_bbt (mtd, buf, td);
-
- /* Search the mirror table */
- if (md)
- search_bbt (mtd, buf, md);
-
- /* Force result check */
- return 1;
-}
-
-
-/**
- * write_bbt - [GENERIC] (Re)write the bad block table
- *
- * @mtd: MTD device structure
- * @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 mtd_info *mtd, uint8_t *buf,
- struct nand_bbt_descr *td, struct nand_bbt_descr *md, int chipsel)
-{
- struct nand_chip *this = mtd->priv;
- struct nand_oobinfo oobinfo;
- struct erase_info einfo;
- int i, j, res, chip = 0;
- int bits, startblock, dir, page, offs, numblocks, sft, sftmsk;
- int nrchips, bbtoffs, pageoffs;
- uint8_t msk[4];
- uint8_t rcode = td->reserved_block_code;
- size_t retlen, len = 0;
- loff_t to;
-
- if (!rcode)
- rcode = 0xff;
- /* Write bad block table per chip rather than per device ? */
- if (td->options & NAND_BBT_PERCHIP) {
- numblocks = (int) (this->chipsize >> this->bbt_erase_shift);
- /* Full device write or specific chip ? */
- if (chipsel == -1) {
- nrchips = this->numchips;
- } else {
- nrchips = chipsel + 1;
- chip = chipsel;
- }
- } else {
- numblocks = (int) (mtd->size >> this->bbt_erase_shift);
- nrchips = 1;
- }
-
- /* Loop through the chips */
- for (; chip < nrchips; chip++) {
-
- /* There was already a version of the table, reuse the page
- * This applies for absolute placement too, as we have the
- * page nr. in td->pages.
- */
- if (td->pages[chip] != -1) {
- page = td->pages[chip];
- goto write;
- }
-
- /* 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 ((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