*
* Overview:
* Bad block table support for the NAND driver
- *
+ *
* Copyright (C) 2004 Thomas Gleixner (tglx@linutronix.de)
*
- * $Id: nand_bbt.c,v 1.24 2004/06/28 08:25:35 gleixner Exp $
+ * $Id: nand_bbt.c,v 1.36 2005/11/07 11:14:30 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
*
* 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
+ * 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
+ * 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- * If one of the bbt's is out of date or does not exist it is (re)created.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.
+ * If one of the bbt's is out of date or does not exist it is (re)created.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
+ * 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
+ * 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
* 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
- *
+ * - the space necessary for a bbt in FLASH does not exceed a block boundary
+ *
*/
#include <linux/slab.h>
#include <linux/mtd/compatmac.h>
#include <linux/bitops.h>
#include <linux/delay.h>
+#include <linux/vmalloc.h>
-
-/**
+/**
* check_pattern - [GENERIC] check if a pattern is in the buffer
* @buf: the buffer to search
* @len: the length of buffer to search
* pattern area contain 0xff
*
*/
-static int check_pattern (uint8_t *buf, int len, int paglen, struct nand_bbt_descr *td)
+static int check_pattern(uint8_t *buf, int len, int paglen, struct nand_bbt_descr *td)
{
- int i, end;
+ int i, end = 0;
uint8_t *p = buf;
end = paglen + td->offs;
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) {
+ p += td->len;
+ end += td->len;
for (i = end; i < len; i++) {
if (*p++ != 0xff)
return -1;
return 0;
}
+/**
+ * check_short_pattern - [GENERIC] check if a pattern is in the buffer
+ * @buf: the buffer to search
+ * @td: search pattern descriptor
+ *
+ * Check for a pattern at the given place. Used to search bad block
+ * tables and good / bad block identifiers. Same as check_pattern, but
+ * no optional empty check
+ *
+*/
+static int check_short_pattern(uint8_t *buf, struct nand_bbt_descr *td)
+{
+ int i;
+ uint8_t *p = buf;
+
+ /* Compare the pattern */
+ for (i = 0; i < td->len; i++) {
+ if (p[td->offs + i] != td->pattern[i])
+ return -1;
+ }
+ return 0;
+}
+
/**
* read_bbt - [GENERIC] Read the bad block table starting from page
* @mtd: MTD device structure
* @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)
+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;
uint8_t msk = (uint8_t) ((1 << bits) - 1);
totlen = (num * bits) >> 3;
- from = ((loff_t)page) << this->page_shift;
-
+ 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);
+ len = min(totlen, (size_t) (1 << this->bbt_erase_shift));
+ res = mtd->read(mtd, from, len, &retlen, buf);
if (res < 0) {
if (retlen != len) {
- printk (KERN_INFO "nand_bbt: Error reading bad block table\n");
+ 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");
- }
+ printk(KERN_WARNING "nand_bbt: ECC error while reading bad block table\n");
+ }
/* Analyse data */
for (i = 0; i < len; i++) {
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);
+ 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);
+ mtd->ecc_stats.bbtblocks++;
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 ? */
+ 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);
- }
+ mtd->ecc_stats.badblocks++;
+ }
}
totlen -= len;
from += len;
* 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
+ * @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)
+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;
return 0;
}
+/*
+ * Scan read raw data from flash
+ */
+static int scan_read_raw(struct mtd_info *mtd, uint8_t *buf, loff_t offs,
+ size_t len)
+{
+ struct mtd_oob_ops ops;
+
+ ops.mode = MTD_OOB_RAW;
+ ops.ooboffs = 0;
+ ops.ooblen = mtd->oobsize;
+ ops.oobbuf = buf;
+ ops.datbuf = buf;
+ ops.len = len;
+
+ return mtd->read_oob(mtd, offs, &ops);
+}
+
+/*
+ * Scan write data with oob to flash
+ */
+static int scan_write_bbt(struct mtd_info *mtd, loff_t offs, size_t len,
+ uint8_t *buf, uint8_t *oob)
+{
+ struct mtd_oob_ops ops;
+
+ ops.mode = MTD_OOB_PLACE;
+ ops.ooboffs = 0;
+ ops.ooblen = mtd->oobsize;
+ ops.datbuf = buf;
+ ops.oobbuf = oob;
+ ops.len = len;
+
+ return mtd->write_oob(mtd, offs, &ops);
+}
+
/**
* 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
+ * @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)
+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 */
+ /* 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]);
+ scan_read_raw(mtd, buf, td->pages[0] << this->page_shift,
+ mtd->writesize);
+ td->version[0] = buf[mtd->writesize + 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 */
+ /* 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]);
+ scan_read_raw(mtd, buf, md->pages[0] << this->page_shift,
+ mtd->writesize);
+ md->version[0] = buf[mtd->writesize + md->veroffs];
+ printk(KERN_DEBUG "Bad block table at page %d, version 0x%02X\n",
+ md->pages[0], md->version[0]);
}
-
return 1;
}
+/*
+ * Scan a given block full
+ */
+static int scan_block_full(struct mtd_info *mtd, struct nand_bbt_descr *bd,
+ loff_t offs, uint8_t *buf, size_t readlen,
+ int scanlen, int len)
+{
+ int ret, j;
+
+ ret = scan_read_raw(mtd, buf, offs, readlen);
+ if (ret)
+ return ret;
+
+ for (j = 0; j < len; j++, buf += scanlen) {
+ if (check_pattern(buf, scanlen, mtd->writesize, bd))
+ return 1;
+ }
+ return 0;
+}
+
+/*
+ * Scan a given block partially
+ */
+static int scan_block_fast(struct mtd_info *mtd, struct nand_bbt_descr *bd,
+ loff_t offs, uint8_t *buf, int len)
+{
+ struct mtd_oob_ops ops;
+ int j, ret;
+
+ ops.ooblen = mtd->oobsize;
+ ops.oobbuf = buf;
+ ops.ooboffs = 0;
+ ops.datbuf = NULL;
+ ops.mode = MTD_OOB_PLACE;
+
+ for (j = 0; j < len; j++) {
+ /*
+ * Read the full oob until read_oob is fixed to
+ * handle single byte reads for 16 bit
+ * buswidth
+ */
+ ret = mtd->read_oob(mtd, offs, &ops);
+ if (ret)
+ return ret;
+
+ if (check_short_pattern(buf, bd))
+ return 1;
+
+ offs += mtd->writesize;
+ }
+ return 0;
+}
+
/**
* create_bbt - [GENERIC] Create a bad block table by scanning the device
* @mtd: MTD device structure
* 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)
+static int 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 i, numblocks, len, scanlen;
int startblock;
loff_t from;
- size_t readlen, ooblen;
+ size_t readlen;
- printk (KERN_INFO "Scanning device for bad blocks\n");
+ printk(KERN_INFO "Scanning device for bad blocks\n");
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
+ else
len = 1;
}
- scanlen = mtd->oobblock + mtd->oobsize;
- readlen = len * mtd->oobblock;
- ooblen = len * mtd->oobsize;
+
+ if (!(bd->options & NAND_BBT_SCANEMPTY)) {
+ /* We need only read few bytes from the OOB area */
+ scanlen = 0;
+ readlen = bd->len;
+ } else {
+ /* Full page content should be read */
+ scanlen = mtd->writesize + mtd->oobsize;
+ readlen = len * mtd->writesize;
+ }
if (chip == -1) {
- /* Note that numblocks is 2 * (real numblocks) here, see i+=2 below as it
- * makes shifting and masking less painful */
+ /* 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;
+ printk(KERN_WARNING "create_bbt(): chipnr (%d) > available chips (%d)\n",
+ chip + 1, this->numchips);
+ return -EINVAL;
}
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);
- printk (KERN_WARNING "Bad eraseblock %d at 0x%08x\n",
- i >> 1, (unsigned int) from);
- break;
- }
+ int ret;
+
+ if (bd->options & NAND_BBT_SCANALLPAGES)
+ ret = scan_block_full(mtd, bd, from, buf, readlen,
+ scanlen, len);
+ else
+ ret = scan_block_fast(mtd, bd, from, buf, len);
+
+ if (ret < 0)
+ return ret;
+
+ if (ret) {
+ this->bbt[i >> 3] |= 0x03 << (i & 0x6);
+ printk(KERN_WARNING "Bad eraseblock %d at 0x%08x\n",
+ i >> 1, (unsigned int)from);
+ mtd->ecc_stats.badblocks++;
}
+
i += 2;
from += (1 << this->bbt_erase_shift);
}
+ return 0;
}
/**
* @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
+ * 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
+ * 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.
+ * 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.
+ * 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)
+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 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;
+ startblock = (mtd->size >> this->bbt_erase_shift) - 1;
dir = -1;
} else {
- startblock = 0;
+ startblock = 0;
dir = 1;
- }
-
+ }
+
/* Do we have a bbt per chip ? */
if (td->options & NAND_BBT_PERCHIP) {
chips = this->numchips;
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->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 = actblock << this->bbt_erase_shift;
+
/* 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);
+ scan_read_raw(mtd, buf, offs, mtd->writesize);
+ if (!check_pattern(buf, scanlen, mtd->writesize, td)) {
+ td->pages[i] = actblock << blocktopage;
if (td->options & NAND_BBT_VERSION) {
- td->version[i] = buf[mtd->oobblock + td->veroffs];
+ td->version[i] = buf[mtd->writesize + td->veroffs];
}
break;
}
/* 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);
+ 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]);
+ printk(KERN_DEBUG "Bad block table found at page %d, version 0x%02X\n", td->pages[i],
+ td->version[i]);
}
- return 0;
+ 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
+ * @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)
+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_bbt(mtd, buf, td);
+
/* Search the mirror table */
if (md)
- search_bbt (mtd, buf, md);
-
+ search_bbt(mtd, buf, md);
+
/* Force result check */
- return 1;
+ 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
+ * @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)
+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;
+ int nrchips, bbtoffs, 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_OOB_PLACE;
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 ? */
+ numblocks = (int)(this->chipsize >> this->bbt_erase_shift);
+ /* Full device write or specific chip ? */
if (chipsel == -1) {
nrchips = this->numchips;
} else {
chip = chipsel;
}
} else {
- numblocks = (int) (mtd->size >> this->bbt_erase_shift);
+ 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
+
+ /* 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 ? */
} 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) {
+ switch ((this->bbt[block >> 2] >>
+ (2 * (block & 0x03))) & 0x03) {
case 0x01:
case 0x03:
continue;
}
- page = block << (this->bbt_erase_shift - this->page_shift);
+ 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");
+ printk(KERN_ERR "No space left to write bad block table\n");
return -ENOSPC;
-write:
+ write:
/* 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[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;
+ 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;
}
-
+
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);
+ res = mtd->read(mtd, to, len, &retlen, buf);
if (res < 0) {
if (retlen != len) {
- printk (KERN_INFO "nand_bbt: Error reading block for writing the bad block table\n");
+ 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");
+ printk(KERN_WARNING "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));
- /* 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];
- }
+ memset(&buf[offs], 0xff, (size_t) (numblocks >> sft));
+ ooboffs = len + (pageoffs * mtd->oobsize);
+
} else {
/* Calc length */
len = (size_t) (numblocks >> sft);
/* Make it page aligned ! */
- len = (len + (mtd->oobblock-1)) & ~(mtd->oobblock-1);
+ len = (len + (mtd->writesize - 1)) &
+ ~(mtd->writesize - 1);
/* Preset the buffer with 0xff */
- memset (buf, 0xff, len + (len >> this->page_shift) * mtd->oobsize);
+ 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[len + td->offs], td->pattern, td->len);
- if (td->options & NAND_BBT_VERSION) {
- buf[len + td->veroffs] = td->version[chip];
- }
+ 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; ) {
+ for (i = 0; i < numblocks;) {
uint8_t dat;
dat = this->bbt[bbtoffs + (i >> 2)];
- for (j = 0; j < 4; j++ , i++) {
+ 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);
+ buf[offs + (i >> sft)] &=
+ ~(msk[dat & 0x03] << sftcnt);
dat >>= 2;
}
}
-
- memset (&einfo, 0, sizeof (einfo));
+
+ memset(&einfo, 0, sizeof(einfo));
einfo.mtd = mtd;
- einfo.addr = (unsigned long) to;
+ 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]);
-
+ res = nand_erase_nand(mtd, &einfo, 1);
+ if (res < 0)
+ goto outerr;
+
+ res = scan_write_bbt(mtd, to, len, buf, &buf[len]);
+ if (res < 0)
+ goto outerr;
+
+ 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;
+
+ outerr:
+ printk(KERN_WARNING
+ "nand_bbt: Error while writing bad block table %d\n", res);
+ return res;
}
/**
* @mtd: MTD device structure
* @bd: descriptor for the good/bad block search pattern
*
- * The function creates a memory based bbt by scanning the device
+ * 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)
+static inline 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;
+ bd->options &= ~NAND_BBT_SCANEMPTY;
+ return create_bbt(mtd, this->buffers->databuf, bd, -1);
}
/**
- * check_create - [GENERIC] create and write bbt(s) if neccecary
+ * check_create - [GENERIC] create and write bbt(s) if necessary
* @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
+ * 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 mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *bd)
+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 *rd, *rd2;
/* Do we have a bbt per chip ? */
- if (td->options & NAND_BBT_PERCHIP)
+ if (td->options & NAND_BBT_PERCHIP)
chips = this->numchips;
- else
+ else
chips = 1;
-
+
for (i = 0; i < chips; i++) {
writeops = 0;
rd = NULL;
}
if (td->pages[i] == -1) {
- rd = md;
+ rd = md;
td->version[i] = md->version[i];
writeops = 1;
goto writecheck;
if (!(td->options & NAND_BBT_VERSION))
rd2 = md;
goto writecheck;
- }
+ }
if (((int8_t) (td->version[i] - md->version[i])) > 0) {
rd = td;
rd = td;
goto writecheck;
}
-create:
+ create:
/* Create the bad block table by scanning the device ? */
if (!(td->options & NAND_BBT_CREATE))
- continue;
-
+ continue;
+
/* Create the table in memory by scanning the chip(s) */
- create_bbt (mtd, buf, bd, chipsel);
-
+ create_bbt(mtd, buf, bd, chipsel);
+
td->version[i] = 1;
if (md)
- md->version[i] = 1;
-writecheck:
+ md->version[i] = 1;
+ writecheck:
/* read back first ? */
if (rd)
- read_abs_bbt (mtd, buf, rd, chipsel);
+ read_abs_bbt(mtd, buf, rd, chipsel);
/* If they weren't versioned, read both. */
if (rd2)
- read_abs_bbt (mtd, buf, rd2, chipsel);
+ 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);
+ 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);
+ res = write_bbt(mtd, buf, md, td, chipsel);
if (res < 0)
return res;
}
}
- return 0;
+ return 0;
}
/**
- * mark_bbt_regions - [GENERIC] mark the bad block table regions
+ * mark_bbt_regions - [GENERIC] mark the bad block table regions
* @mtd: MTD device structure
* @td: bad block table descriptor
*
* 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)
+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;
} 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;
+ if (td->pages[i] == -1)
+ continue;
block = td->pages[i] >> (this->bbt_erase_shift - this->page_shift);
- block <<= 1;
+ block <<= 1;
oldval = this->bbt[(block >> 3)];
newval = oldval | (0x2 << (block & 0x06));
this->bbt[(block >> 3)] = newval;
update = 0;
if (td->options & NAND_BBT_LASTBLOCK)
block = ((i + 1) * nrblocks) - td->maxblocks;
- else
+ else
block = i * nrblocks;
- block <<= 1;
+ 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;
+ 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. */
* @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
+ * 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.
* by calling the nand_free_bbt function.
*
*/
-int nand_scan_bbt (struct mtd_info *mtd, struct nand_bbt_descr *bd)
+int nand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd)
{
struct nand_chip *this = mtd->priv;
int len, res = 0;
struct nand_bbt_descr *md = this->bbt_md;
len = mtd->size >> (this->bbt_erase_shift + 2);
- /* Allocate memory (2bit per block) */
- this->bbt = (uint8_t *) kmalloc (len, GFP_KERNEL);
+ /* Allocate memory (2bit per block) and clear the memory bad block table */
+ this->bbt = kzalloc(len, GFP_KERNEL);
if (!this->bbt) {
- printk (KERN_ERR "nand_scan_bbt: Out of memory\n");
+ 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);
+ if (!td) {
+ if ((res = nand_memory_bbt(mtd, bd))) {
+ printk(KERN_ERR "nand_bbt: Can't scan flash and build the RAM-based BBT\n");
+ kfree(this->bbt);
+ this->bbt = NULL;
+ }
+ return res;
+ }
/* 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);
+ buf = vmalloc(len);
if (!buf) {
- printk (KERN_ERR "nand_bbt: Out of memory\n");
- kfree (this->bbt);
+ 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 {
+ 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);
- }
+ res = search_read_bbts(mtd, buf, td, md);
+ }
+
+ if (res)
+ res = check_create(mtd, buf, bd);
- if (res)
- res = check_create (mtd, buf, bd);
-
/* Prevent the bbt regions from erasing / writing */
- mark_bbt_region (mtd, td);
+ mark_bbt_region(mtd, td);
if (md)
- mark_bbt_region (mtd, md);
-
- kfree (buf);
+ mark_bbt_region(mtd, md);
+
+ vfree(buf);
return res;
}
-
/**
- * nand_update_bbt - [NAND Interface] update bad block table(s)
+ * 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)
+int nand_update_bbt(struct mtd_info *mtd, loff_t offs)
{
struct nand_chip *this = mtd->priv;
int len, res = 0, writeops = 0;
/* 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);
+ buf = kmalloc(len, GFP_KERNEL);
if (!buf) {
- printk (KERN_ERR "nand_update_bbt: Out of memory\n");
+ 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);
+ chip = (int)(offs >> this->chip_shift);
chipsel = chip;
} else {
chip = 0;
td->version[chip]++;
if (md)
- md->version[chip]++;
+ 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);
+ 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);
+ res = write_bbt(mtd, buf, md, td, chipsel);
}
-out:
- kfree (buf);
+ 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
- */
+/* 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 };
static struct nand_bbt_descr smallpage_memorybased = {
- .options = 0,
+ .options = NAND_BBT_SCAN2NDPAGE,
.offs = 5,
.len = 1,
.pattern = scan_ff_pattern
};
static struct nand_bbt_descr smallpage_flashbased = {
- .options = NAND_BBT_SCANEMPTY | NAND_BBT_SCANALLPAGES,
+ .options = NAND_BBT_SCAN2NDPAGE,
.offs = 5,
.len = 1,
.pattern = scan_ff_pattern
};
static struct nand_bbt_descr largepage_flashbased = {
- .options = NAND_BBT_SCANEMPTY | NAND_BBT_SCANALLPAGES,
+ .options = NAND_BBT_SCAN2NDPAGE,
.offs = 0,
.len = 2,
.pattern = scan_ff_pattern
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
+ .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
| NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP,
.offs = 8,
.len = 4,
};
static struct nand_bbt_descr bbt_mirror_descr = {
- .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
+ .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
| NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP,
.offs = 8,
.len = 4,
};
/**
- * nand_default_bbt - [NAND Interface] Select a default bad block table for the device
+ * 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)
+int nand_default_bbt(struct mtd_info *mtd)
{
struct nand_chip *this = mtd->priv;
-
- /* Default for AG-AND. We must use a flash based
+
+ /* 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
+ * this information in a good / bad table during
* startup
- */
+ */
if (this->options & NAND_IS_AND) {
/* Use the default pattern descriptors */
- if (!this->bbt_td) {
+ 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);
+ 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) {
+ /* Use the default pattern descriptors */
+ if (!this->bbt_td) {
this->bbt_td = &bbt_main_descr;
this->bbt_md = &bbt_mirror_descr;
- }
- if (mtd->oobblock > 512)
- return nand_scan_bbt (mtd, &largepage_flashbased);
- else
- return nand_scan_bbt (mtd, &smallpage_flashbased);
+ }
+ if (!this->badblock_pattern) {
+ this->badblock_pattern = (mtd->writesize > 512) ? &largepage_flashbased : &smallpage_flashbased;
+ }
} else {
this->bbt_td = NULL;
this->bbt_md = NULL;
- if (mtd->oobblock > 512)
- return nand_scan_bbt (mtd, &largepage_memorybased);
- else
- return nand_scan_bbt (mtd, &smallpage_memorybased);
+ if (!this->badblock_pattern) {
+ this->badblock_pattern = (mtd->writesize > 512) ?
+ &largepage_memorybased : &smallpage_memorybased;
+ }
}
+ return nand_scan_bbt(mtd, this->badblock_pattern);
}
/**
- * nand_isbad_bbt - [NAND Interface] Check if a block is bad
+ * 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)
+int nand_isbad_bbt(struct mtd_info *mtd, loff_t offs, int allowbbt)
{
struct nand_chip *this = mtd->priv;
int block;
- uint8_t res;
-
+ uint8_t res;
+
/* Get block number * 2 */
- block = (int) (offs >> (this->bbt_erase_shift - 1));
+ 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);
+ DEBUG(MTD_DEBUG_LEVEL2, "nand_isbad_bbt(): bbt info for offs 0x%08x: (block %d) 0x%02x\n",
+ (unsigned int)offs, block >> 1, res);
switch ((int)res) {
- case 0x00: return 0;
- case 0x01: return 1;
- case 0x02: return allowbbt ? 0 : 1;
+ case 0x00:
+ return 0;
+ case 0x01:
+ return 1;
+ case 0x02:
+ return allowbbt ? 0 : 1;
}
return 1;
}
-EXPORT_SYMBOL (nand_scan_bbt);
-EXPORT_SYMBOL (nand_default_bbt);
+EXPORT_SYMBOL(nand_scan_bbt);
+EXPORT_SYMBOL(nand_default_bbt);
git://git.onelab.eu / linux-2.6.git / blobdiff