*
* 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 $
*
* 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- * If one of the bbt's is out of date or does not exist it is (re)created.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+ * If one of the bbt's is out of date or does not exist it is (re)created.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
- *
+ *
*/
#include <common.h>
+#ifdef CFG_NAND_LEGACY
+#error CFG_NAND_LEGACY defined in a file not using the legacy NAND support!
+#endif
+
#if (CONFIG_COMMANDS & CFG_CMD_NAND)
#include <malloc.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
if (p[i] != 0xff)
return -1;
}
- }
+ }
p += end;
-
+
/* Compare the pattern */
for (i = 0; i < td->len; i++) {
if (p[i] != td->pattern[i])
* Read the bad block table starting from page.
*
*/
-static int read_bbt (struct mtd_info *mtd, uint8_t *buf, int page, int num,
+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;
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);
return res;
}
printk (KERN_WARNING "nand_bbt: ECC error while reading bad block table\n");
- }
+ }
/* Analyse data */
for (i = 0; i < len; i++) {
* 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 ? */
+ /* 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;
* 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_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
{
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);
+ 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 */
+ /* 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);
+ 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]);
}
loff_t from;
size_t readlen, ooblen;
- 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;
if (chip >= this->numchips) {
printk (KERN_WARNING "create_bbt(): chipnr (%d) > available chips (%d)\n",
chip + 1, this->numchips);
- return;
+ 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);
- printk (KERN_WARNING "Bad eraseblock %d at 0x%08x\n",
- i >> 1, (unsigned int) from);
break;
}
}
* @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.
*
- * 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)
{
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;
/* Read first page */
- nand_read_raw (mtd, buf, actblock << this->bbt_erase_shift, mtd->oobblock, mtd->oobsize);
+ 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) {
else
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,
+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;
+ 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,
+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;
/* 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 ? */
+ /* Full device write or specific chip ? */
if (chipsel == -1) {
nrchips = this->numchips;
} else {
} 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
+
+ /* 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;
}
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;
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 */
buf[len + td->veroffs] = td->version[chip];
}
}
-
+
/* walk through the memory table */
for (i = 0; i < numblocks; ) {
uint8_t dat;
dat >>= 2;
}
}
-
+
memset (&einfo, 0, sizeof (einfo));
einfo.mtd = mtd;
einfo.addr = (unsigned long) to;
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",
+ 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;
}
* @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)
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;
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);
-
+
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);
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);
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
*
} 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;
+ 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;
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.
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 {
+ } else {
/* Search the bad block table using a pattern in oob */
res = search_read_bbts (mtd, buf, td, md);
- }
+ }
- if (res)
+ 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)
+ * nand_update_bbt - [NAND Interface] update bad block table(s)
* @mtd: MTD device structure
* @offs: the offset of the newly marked block
*
printk (KERN_ERR "nand_update_bbt: Out of memory\n");
return -ENOMEM;
}
-
+
writeops = md != NULL ? 0x03 : 0x01;
/* Do we have a bbt per chip ? */
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, md, td, chipsel);
}
-out:
+out:
kfree (buf);
return res;
}
-/* Define some generic bad / good block scan pattern which are used
+/* 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
+ *
+ * The memory based patterns just
*/
static uint8_t scan_ff_pattern[] = { 0xff, 0xff };
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
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);
}
-
-
+
+
/* 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;
}
}
/**
- * 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)
{
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",
+ 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) {
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