/** * 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.
*/ staticint check_pattern(uint8_t *buf, int len, int paglen, struct nand_bbt_descr *td)
{ if (td->options & NAND_BBT_NO_OOB) return check_pattern_no_oob(buf, td);
/* Compare the pattern */ if (memcmp(buf + paglen + td->offs, td->pattern, td->len)) 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.
*/ staticint check_short_pattern(uint8_t *buf, struct nand_bbt_descr *td)
{ /* Compare the pattern */ if (memcmp(buf + td->offs, td->pattern, td->len)) return -1; return 0;
}
/** * add_marker_len - compute the length of the marker in data area * @td: BBT descriptor used for computation * * The length will be 0 if the marker is located in OOB area.
*/ static u32 add_marker_len(struct nand_bbt_descr *td)
{
u32 len;
if (!(td->options & NAND_BBT_NO_OOB)) return 0;
len = td->len; if (td->options & NAND_BBT_VERSION)
len++; return len;
}
/** * read_bbt - [GENERIC] Read the bad block table starting from page * @this: NAND chip object * @buf: temporary buffer * @page: the starting page * @num: the number of bbt descriptors to read * @td: the bbt describtion table * @offs: block number offset in the table * * Read the bad block table starting from page.
*/ staticint read_bbt(struct nand_chip *this, uint8_t *buf, int page, int num, struct nand_bbt_descr *td, int offs)
{ struct mtd_info *mtd = nand_to_mtd(this); int res, ret = 0, i, j, act = 0;
size_t retlen, len, totlen;
loff_t from; int bits = td->options & NAND_BBT_NRBITS_MSK;
uint8_t msk = (uint8_t)((1 << bits) - 1);
u32 marker_len; int reserved_block_code = td->reserved_block_code;
while (totlen) {
len = min(totlen, (size_t)(1 << this->bbt_erase_shift)); if (marker_len) { /* * In case the BBT marker is not in the OOB area it * will be just in the first page.
*/
len -= marker_len;
from += marker_len;
marker_len = 0;
}
res = mtd_read(mtd, from, len, &retlen, buf); if (res < 0) { if (mtd_is_eccerr(res)) {
pr_info("nand_bbt: ECC error in BBT at 0x%012llx\n",
from & ~mtd->writesize); return res;
} elseif (mtd_is_bitflip(res)) {
pr_info("nand_bbt: corrected error in BBT at 0x%012llx\n",
from & ~mtd->writesize);
ret = res;
} else {
pr_info("nand_bbt: error reading BBT\n"); return res;
}
}
/* Analyse data */ for (i = 0; i < len; i++) {
uint8_t dat = buf[i]; for (j = 0; j < 8; j += bits, act++) {
uint8_t tmp = (dat >> j) & msk; if (tmp == msk) continue; if (reserved_block_code && (tmp == reserved_block_code)) {
pr_info("nand_read_bbt: reserved block at 0x%012llx\n",
(loff_t)(offs + act) <<
this->bbt_erase_shift);
bbt_mark_entry(this, offs + act,
BBT_BLOCK_RESERVED);
mtd->ecc_stats.bbtblocks++; continue;
} /* * Leave it for now, if it's matured we can * move this message to pr_debug.
*/
pr_info("nand_read_bbt: bad block at 0x%012llx\n",
(loff_t)(offs + act) <<
this->bbt_erase_shift); /* Factory marked bad or worn out? */ if (tmp == 0)
bbt_mark_entry(this, offs + act,
BBT_BLOCK_FACTORY_BAD); else
bbt_mark_entry(this, offs + act,
BBT_BLOCK_WORN);
mtd->ecc_stats.badblocks++;
}
}
totlen -= len;
from += len;
} return ret;
}
/** * read_abs_bbt - [GENERIC] Read the bad block table starting at a given page * @this: NAND chip object * @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.
*/ staticint read_abs_bbt(struct nand_chip *this, uint8_t *buf, struct nand_bbt_descr *td, int chip)
{ struct mtd_info *mtd = nand_to_mtd(this);
u64 targetsize = nanddev_target_size(&this->base); int res = 0, i;
if (td->options & NAND_BBT_PERCHIP) { int offs = 0; for (i = 0; i < nanddev_ntargets(&this->base); i++) { if (chip == -1 || chip == i)
res = read_bbt(this, buf, td->pages[i],
targetsize >> this->bbt_erase_shift,
td, offs); if (res) return res;
offs += targetsize >> this->bbt_erase_shift;
}
} else {
res = read_bbt(this, buf, td->pages[0],
mtd->size >> this->bbt_erase_shift, td, 0); if (res) return res;
} return 0;
}
/* BBT marker is in the first page, no OOB */ staticint scan_read_data(struct nand_chip *this, uint8_t *buf, loff_t offs, struct nand_bbt_descr *td)
{ struct mtd_info *mtd = nand_to_mtd(this);
size_t retlen;
size_t len;
len = td->len; if (td->options & NAND_BBT_VERSION)
len++;
return mtd_read(mtd, offs, len, &retlen, buf);
}
/** * scan_read_oob - [GENERIC] Scan data+OOB region to buffer * @this: NAND chip object * @buf: temporary buffer * @offs: offset at which to scan * @len: length of data region to read * * Scan read data from data+OOB. May traverse multiple pages, interleaving * page,OOB,page,OOB,... in buf. Completes transfer and returns the "strongest" * ECC condition (error or bitflip). May quit on the first (non-ECC) error.
*/ staticint scan_read_oob(struct nand_chip *this, uint8_t *buf, loff_t offs,
size_t len)
{ struct mtd_info *mtd = nand_to_mtd(this); struct mtd_oob_ops ops = { }; int res, ret = 0;
if (!(td->options & NAND_BBT_NO_OOB))
ver_offs += mtd->writesize; return ver_offs;
}
/** * read_abs_bbts - [GENERIC] Read the bad block table(s) for all chips starting at a given page * @this: NAND chip object * @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.
*/ staticvoid read_abs_bbts(struct nand_chip *this, uint8_t *buf, struct nand_bbt_descr *td, struct nand_bbt_descr *md)
{ struct mtd_info *mtd = nand_to_mtd(this);
/* Read the primary version, if available */ if (td->options & NAND_BBT_VERSION) {
scan_read(this, buf, (loff_t)td->pages[0] << this->page_shift,
mtd->writesize, td);
td->version[0] = buf[bbt_get_ver_offs(this, td)];
pr_info("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)) {
scan_read(this, buf, (loff_t)md->pages[0] << this->page_shift,
mtd->writesize, md);
md->version[0] = buf[bbt_get_ver_offs(this, md)];
pr_info("Bad block table at page %d, version 0x%02X\n",
md->pages[0], md->version[0]);
}
}
while (page_offset >= 0) { /* * Read the full oob until read_oob is fixed to handle single * byte reads for 16 bit buswidth.
*/
ret = mtd_read_oob(mtd, offs + (page_offset * mtd->writesize),
&ops); /* Ignore ECC errors when checking for BBM */ if (ret && !mtd_is_bitflip_or_eccerr(ret)) return ret;
/* Check if a potential BBT block is marked as bad */ staticint bbt_block_checkbad(struct nand_chip *this, struct nand_bbt_descr *td,
loff_t offs, uint8_t *buf)
{ struct nand_bbt_descr *bd = this->badblock_pattern;
/* * No need to check for a bad BBT block if the BBM area overlaps with * the bad block table marker area in OOB since writing a BBM here * invalidates the bad block table marker anyway.
*/ if (!(td->options & NAND_BBT_NO_OOB) &&
td->offs >= bd->offs && td->offs < bd->offs + bd->len) return 0;
/* * There is no point in checking for a bad block marker if writing * such marker is not supported
*/ if (this->bbt_options & NAND_BBT_NO_OOB_BBM ||
this->options & NAND_NO_BBM_QUIRK) return 0;
if (scan_block_fast(this, bd, offs, buf) > 0) return 1;
return 0;
}
/** * create_bbt - [GENERIC] Create a bad block table by scanning the device * @this: NAND chip object * @buf: temporary buffer * @bd: descriptor for the good/bad block search pattern * @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.
*/ staticint create_bbt(struct nand_chip *this, uint8_t *buf, struct nand_bbt_descr *bd, int chip)
{
u64 targetsize = nanddev_target_size(&this->base); struct mtd_info *mtd = nand_to_mtd(this); int i, numblocks, startblock;
loff_t from;
for (i = startblock; i < numblocks; i++) { int ret;
BUG_ON(bd->options & NAND_BBT_NO_OOB);
ret = scan_block_fast(this, bd, from, buf); if (ret < 0) return ret;
if (ret) {
bbt_mark_entry(this, i, BBT_BLOCK_FACTORY_BAD);
pr_warn("Bad eraseblock %d at 0x%012llx\n",
i, (unsignedlonglong)from);
mtd->ecc_stats.badblocks++;
}
from += (1 << this->bbt_erase_shift);
} return 0;
}
/** * search_bbt - [GENERIC] scan the device for a specific bad block table * @this: NAND chip object * @buf: temporary buffer * @td: descriptor for the bad block table * * Read the bad block table by searching for a given ident pattern. Search is * preformed either from the beginning up or from the end of the device * downwards. The search starts always at the start of a block. If the option * NAND_BBT_PERCHIP is given, each chip is searched for a bbt, which contains * the bad block information of this chip. This is necessary to provide support * for certain DOC devices. * * The bbt ident pattern resides in the oob area of the first page in a block.
*/ staticint search_bbt(struct nand_chip *this, uint8_t *buf, struct nand_bbt_descr *td)
{
u64 targetsize = nanddev_target_size(&this->base); struct mtd_info *mtd = nand_to_mtd(this); int i, chips; int startblock, block, dir; int scanlen = mtd->writesize + mtd->oobsize; int bbtblocks; int blocktopage = this->bbt_erase_shift - this->page_shift;
/* Search direction top -> down? */ if (td->options & NAND_BBT_LASTBLOCK) {
startblock = (mtd->size >> this->bbt_erase_shift) - 1;
dir = -1;
} else {
startblock = 0;
dir = 1;
}
/* Do we have a bbt per chip? */ if (td->options & NAND_BBT_PERCHIP) {
chips = nanddev_ntargets(&this->base);
bbtblocks = targetsize >> this->bbt_erase_shift;
startblock &= bbtblocks - 1;
} else {
chips = 1;
}
for (i = 0; i < chips; i++) { /* Reset version information */
td->version[i] = 0;
td->pages[i] = -1; /* Scan the maximum number of blocks */ for (block = 0; block < td->maxblocks; block++) {
int actblock = startblock + dir * block;
loff_t offs = (loff_t)actblock << this->bbt_erase_shift;
/* Check if block is marked bad */ if (bbt_block_checkbad(this, td, offs, buf)) continue;
/* Read first page */
scan_read(this, buf, offs, mtd->writesize, td); if (!check_pattern(buf, scanlen, mtd->writesize, td)) {
td->pages[i] = actblock << blocktopage; if (td->options & NAND_BBT_VERSION) {
offs = bbt_get_ver_offs(this, td);
td->version[i] = buf[offs];
} break;
}
}
startblock += targetsize >> this->bbt_erase_shift;
} /* Check, if we found a bbt for each requested chip */ for (i = 0; i < chips; i++) { if (td->pages[i] == -1)
pr_warn("Bad block table not found for chip %d\n", i); else
pr_info("Bad block table found at page %d, version 0x%02X\n",
td->pages[i], td->version[i]);
} return 0;
}
/** * search_read_bbts - [GENERIC] scan the device for bad block table(s) * @this: NAND chip object * @buf: temporary buffer * @td: descriptor for the bad block table * @md: descriptor for the bad block table mirror * * Search and read the bad block table(s).
*/ staticvoid search_read_bbts(struct nand_chip *this, uint8_t *buf, struct nand_bbt_descr *td, struct nand_bbt_descr *md)
{ /* Search the primary table */
search_bbt(this, buf, td);
/* Search the mirror table */ if (md)
search_bbt(this, buf, md);
}
/** * get_bbt_block - Get the first valid eraseblock suitable to store a BBT * @this: the NAND device * @td: the BBT description * @md: the mirror BBT descriptor * @chip: the CHIP selector * * This functions returns a positive block number pointing a valid eraseblock * suitable to store a BBT (i.e. in the range reserved for BBT), or -ENOSPC if * all blocks are already used of marked bad. If td->pages[chip] was already * pointing to a valid block we re-use it, otherwise we search for the next * valid one.
*/ staticint get_bbt_block(struct nand_chip *this, struct nand_bbt_descr *td, struct nand_bbt_descr *md, int chip)
{
u64 targetsize = nanddev_target_size(&this->base); int startblock, dir, page, numblocks, i;
/* * There was already a version of the table, reuse the page. This * applies for absolute placement too, as we have the page number in * td->pages.
*/ if (td->pages[chip] != -1) return td->pages[chip] >>
(this->bbt_erase_shift - this->page_shift);
/* Check, if the block is used by the mirror table */ if (!md || md->pages[chip] != page) return block;
}
return -ENOSPC;
}
/** * mark_bbt_block_bad - Mark one of the block reserved for BBT bad * @this: the NAND device * @td: the BBT description * @chip: the CHIP selector * @block: the BBT block to mark * * Blocks reserved for BBT can become bad. This functions is an helper to mark * such blocks as bad. It takes care of updating the in-memory BBT, marking the * block as bad using a bad block marker and invalidating the associated * td->pages[] entry.
*/ staticvoid mark_bbt_block_bad(struct nand_chip *this, struct nand_bbt_descr *td, int chip, int block)
{
loff_t to; int res;
bbt_mark_entry(this, block, BBT_BLOCK_WORN);
to = (loff_t)block << this->bbt_erase_shift;
res = nand_markbad_bbm(this, to); if (res)
pr_warn("nand_bbt: error %d while marking block %d bad\n",
res, block);
td->pages[chip] = -1;
}
/** * write_bbt - [GENERIC] (Re)write the bad block table * @this: NAND chip object * @buf: temporary buffer * @td: descriptor for the bad block table * @md: descriptor for the bad block table mirror * @chipsel: selector for a specific chip, -1 for all * * (Re)write the bad block table.
*/ staticint write_bbt(struct nand_chip *this, uint8_t *buf, struct nand_bbt_descr *td, struct nand_bbt_descr *md, int chipsel)
{
u64 targetsize = nanddev_target_size(&this->base); struct mtd_info *mtd = nand_to_mtd(this); struct erase_info einfo; int i, res, chip = 0; int bits, page, offs, numblocks, sft, sftmsk; int nrchips, pageoffs, ooboffs;
uint8_t msk[4];
uint8_t rcode = td->reserved_block_code;
size_t retlen, len = 0;
loff_t to; struct mtd_oob_ops ops = { };
/* Must we save the block contents? */ if (td->options & NAND_BBT_SAVECONTENT) { /* Make it block aligned */
to &= ~(((loff_t)1 << this->bbt_erase_shift) - 1);
len = 1 << this->bbt_erase_shift;
res = mtd_read(mtd, to, len, &retlen, buf); if (res < 0) { if (retlen != len) {
pr_info("nand_bbt: error reading block for writing the bad block table\n"); return res;
}
pr_warn("nand_bbt: ECC error while reading block for writing bad block table\n");
} /* Read oob data */
ops.ooblen = (len >> this->page_shift) * mtd->oobsize;
ops.oobbuf = &buf[len];
res = mtd_read_oob(mtd, to + mtd->writesize, &ops); if (res < 0 || ops.oobretlen != ops.ooblen) goto outerr;
/* Calc the byte offset in the buffer */
pageoffs = page - (int)(to >> this->page_shift);
offs = pageoffs << this->page_shift; /* Preset the bbt area with 0xff */
memset(&buf[offs], 0xff, (size_t)(numblocks >> sft));
ooboffs = len + (pageoffs * mtd->oobsize);
} elseif (td->options & NAND_BBT_NO_OOB) {
ooboffs = 0;
offs = td->len; /* The version byte */ if (td->options & NAND_BBT_VERSION)
offs++; /* Calc length */
len = (size_t)(numblocks >> sft);
len += offs; /* Make it page aligned! */
len = ALIGN(len, mtd->writesize); /* Preset the buffer with 0xff */
memset(buf, 0xff, len); /* Pattern is located at the begin of first page */
memcpy(buf, td->pattern, td->len);
} else { /* Calc length */
len = (size_t)(numblocks >> sft); /* Make it page aligned! */
len = ALIGN(len, mtd->writesize); /* Preset the buffer with 0xff */
memset(buf, 0xff, len +
(len >> this->page_shift)* mtd->oobsize);
offs = 0;
ooboffs = len; /* Pattern is located in oob area of first page */
memcpy(&buf[ooboffs + td->offs], td->pattern, td->len);
}
if (td->options & NAND_BBT_VERSION)
buf[ooboffs + td->veroffs] = td->version[chip];
/* Walk through the memory table */ for (i = 0; i < numblocks; i++) {
uint8_t dat; int sftcnt = (i << (3 - sft)) & sftmsk;
dat = bbt_get_entry(this, chip * numblocks + i); /* Do not store the reserved bbt blocks! */
buf[offs + (i >> sft)] &= ~(msk[dat] << sftcnt);
}
res = scan_write_bbt(this, to, len, buf,
td->options & NAND_BBT_NO_OOB ?
NULL : &buf[len]); if (res < 0) {
pr_warn("nand_bbt: error while writing BBT block %d\n",
res);
mark_bbt_block_bad(this, td, chip, block); continue;
}
pr_info("Bad block table written to 0x%012llx, version 0x%02X\n",
(unsignedlonglong)to, td->version[chip]);
/* Mark it as used */
td->pages[chip++] = page;
} return 0;
outerr:
pr_warn("nand_bbt: error while writing bad block table %d\n", res); return res;
}
/** * nand_memory_bbt - [GENERIC] create a memory based bad block table * @this: NAND chip object * @bd: descriptor for the good/bad block search pattern * * The function creates a memory based bbt by scanning the device for * manufacturer / software marked good / bad blocks.
*/ staticinlineint nand_memory_bbt(struct nand_chip *this, struct nand_bbt_descr *bd)
{
u8 *pagebuf = nand_get_data_buf(this);
return create_bbt(this, pagebuf, bd, -1);
}
/** * check_create - [GENERIC] create and write bbt(s) if necessary * @this: the NAND device * @buf: temporary buffer * @bd: descriptor for the good/bad block search pattern * * The function checks the results of the previous call to read_bbt and creates * / updates the bbt(s) if necessary. Creation is necessary if no bbt was found * for the chip/device. Update is necessary if one of the tables is missing or * the version nr. of one table is less than the other.
*/ staticint check_create(struct nand_chip *this, uint8_t *buf, struct nand_bbt_descr *bd)
{ int i, chips, writeops, create, chipsel, res, res2; struct nand_bbt_descr *td = this->bbt_td; struct nand_bbt_descr *md = this->bbt_md; struct nand_bbt_descr *rd, *rd2;
/* Do we have a bbt per chip? */ if (td->options & NAND_BBT_PERCHIP)
chips = nanddev_ntargets(&this->base); else
chips = 1;
if (create) { /* Create the bad block table by scanning the device? */ if (!(td->options & NAND_BBT_CREATE)) continue;
/* Create the table in memory by scanning the chip(s) */ if (!(this->bbt_options & NAND_BBT_CREATE_EMPTY))
create_bbt(this, buf, bd, chipsel);
td->version[i] = 1; if (md)
md->version[i] = 1;
}
/* Read back first? */ if (rd) {
res = read_abs_bbt(this, buf, rd, chipsel); if (mtd_is_eccerr(res)) { /* Mark table as invalid */
rd->pages[i] = -1;
rd->version[i] = 0;
i--; continue;
}
} /* If they weren't versioned, read both */ if (rd2) {
res2 = read_abs_bbt(this, buf, rd2, chipsel); if (mtd_is_eccerr(res2)) { /* Mark table as invalid */
rd2->pages[i] = -1;
rd2->version[i] = 0;
i--; continue;
}
}
/* Scrub the flash table(s)? */ if (mtd_is_bitflip(res) || mtd_is_bitflip(res2))
writeops = 0x03;
/* Update version numbers before writing */ if (md) {
td->version[i] = max(td->version[i], md->version[i]);
md->version[i] = td->version[i];
}
/* Write the bad block table to the device? */ if ((writeops & 0x01) && (td->options & NAND_BBT_WRITE)) {
res = write_bbt(this, buf, td, md, chipsel); if (res < 0) return res;
}
/* Write the mirror bad block table to the device? */ if ((writeops & 0x02) && md && (md->options & NAND_BBT_WRITE)) {
res = write_bbt(this, buf, md, td, chipsel); if (res < 0) return res;
}
} return 0;
}
/** * nand_update_bbt - update bad block table(s) * @this: the NAND device * @offs: the offset of the newly marked block * * The function updates the bad block table(s).
*/ staticint nand_update_bbt(struct nand_chip *this, loff_t offs)
{ struct mtd_info *mtd = nand_to_mtd(this); int len, res = 0; int chip, chipsel;
uint8_t *buf; struct nand_bbt_descr *td = this->bbt_td; struct nand_bbt_descr *md = this->bbt_md;
if (!this->bbt || !td) return -EINVAL;
/* Allocate a temporary buffer for one eraseblock incl. oob */
len = (1 << this->bbt_erase_shift);
len += (len >> this->page_shift) * mtd->oobsize;
buf = kmalloc(len, GFP_KERNEL); if (!buf) return -ENOMEM;
/* Do we have a bbt per chip? */ if (td->options & NAND_BBT_PERCHIP) {
chip = (int)(offs >> this->chip_shift);
chipsel = chip;
} else {
chip = 0;
chipsel = -1;
}
td->version[chip]++; if (md)
md->version[chip]++;
/* Write the bad block table to the device? */ if (td->options & NAND_BBT_WRITE) {
res = write_bbt(this, buf, td, md, chipsel); if (res < 0) goto out;
} /* Write the mirror bad block table to the device? */ if (md && (md->options & NAND_BBT_WRITE)) {
res = write_bbt(this, buf, md, td, chipsel);
}
out:
kfree(buf); return res;
}
/** * mark_bbt_region - [GENERIC] mark the bad block table regions * @this: the NAND device * @td: bad block table descriptor * * The bad block table regions are marked as "bad" to prevent accidental * erasures / writes. The regions are identified by the mark 0x02.
*/ staticvoid mark_bbt_region(struct nand_chip *this, struct nand_bbt_descr *td)
{
u64 targetsize = nanddev_target_size(&this->base); struct mtd_info *mtd = nand_to_mtd(this); int i, j, chips, block, nrblocks, update;
uint8_t oldval;
/* Do we have a bbt per chip? */ if (td->options & NAND_BBT_PERCHIP) {
chips = nanddev_ntargets(&this->base);
nrblocks = (int)(targetsize >> this->bbt_erase_shift);
} else {
chips = 1;
nrblocks = (int)(mtd->size >> this->bbt_erase_shift);
}
for (i = 0; i < chips; i++) { if ((td->options & NAND_BBT_ABSPAGE) ||
!(td->options & NAND_BBT_WRITE)) { if (td->pages[i] == -1) continue;
block = td->pages[i] >> (this->bbt_erase_shift - this->page_shift);
oldval = bbt_get_entry(this, block);
bbt_mark_entry(this, block, BBT_BLOCK_RESERVED); if ((oldval != BBT_BLOCK_RESERVED) &&
td->reserved_block_code)
nand_update_bbt(this, (loff_t)block <<
this->bbt_erase_shift); continue;
}
update = 0; if (td->options & NAND_BBT_LASTBLOCK)
block = ((i + 1) * nrblocks) - td->maxblocks; else
block = i * nrblocks; for (j = 0; j < td->maxblocks; j++) {
oldval = bbt_get_entry(this, block);
bbt_mark_entry(this, block, BBT_BLOCK_RESERVED); if (oldval != BBT_BLOCK_RESERVED)
update = 1;
block++;
} /* * If we want reserved blocks to be recorded to flash, and some * new ones have been marked, then we need to update the stored * bbts. This should only happen once.
*/ if (update && td->reserved_block_code)
nand_update_bbt(this, (loff_t)(block - 1) <<
this->bbt_erase_shift);
}
}
/** * verify_bbt_descr - verify the bad block description * @this: the NAND device * @bd: the table to verify * * This functions performs a few sanity checks on the bad block description * table.
*/ staticvoid verify_bbt_descr(struct nand_chip *this, struct nand_bbt_descr *bd)
{
u64 targetsize = nanddev_target_size(&this->base); struct mtd_info *mtd = nand_to_mtd(this);
u32 pattern_len;
u32 bits;
u32 table_size;
/** * nand_scan_bbt - [NAND Interface] scan, find, read and maybe create bad block table(s) * @this: the NAND device * @bd: descriptor for the good/bad block search pattern * * The function checks, if a bad block table(s) is/are already available. If * not it scans the device for manufacturer marked good / bad blocks and writes * the bad block table(s) to the selected place. * * The bad block table memory is allocated here. It must be freed by calling * the nand_free_bbt function.
*/ staticint nand_scan_bbt(struct nand_chip *this, struct nand_bbt_descr *bd)
{ struct mtd_info *mtd = nand_to_mtd(this); int len, res;
uint8_t *buf; struct nand_bbt_descr *td = this->bbt_td; struct nand_bbt_descr *md = this->bbt_md;
len = (mtd->size >> (this->bbt_erase_shift + 2)) ? : 1; /* * Allocate memory (2bit per block) and clear the memory bad block * table.
*/
this->bbt = kzalloc(len, GFP_KERNEL); if (!this->bbt) return -ENOMEM;
/* * If no primary table descriptor is given, scan the device to build a * memory based bad block table.
*/ if (!td) { if ((res = nand_memory_bbt(this, bd))) {
pr_err("nand_bbt: can't scan flash and build the RAM-based BBT\n"); goto err_free_bbt;
} return 0;
}
verify_bbt_descr(this, td);
verify_bbt_descr(this, md);
/* Allocate a temporary buffer for one eraseblock incl. oob */
len = (1 << this->bbt_erase_shift);
len += (len >> this->page_shift) * mtd->oobsize;
buf = vmalloc(len); if (!buf) {
res = -ENOMEM; goto err_free_bbt;
}
/* Is the bbt at a given page? */ if (td->options & NAND_BBT_ABSPAGE) {
read_abs_bbts(this, buf, td, md);
} else { /* Search the bad block table using a pattern in oob */
search_read_bbts(this, buf, td, md);
}
res = check_create(this, buf, bd); if (res) goto err_free_buf;
/* Prevent the bbt regions from erasing / writing */
mark_bbt_region(this, td); if (md)
mark_bbt_region(this, md);
/* * 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 };
#define BADBLOCK_SCAN_MASK (~NAND_BBT_NO_OOB) /** * nand_create_badblock_pattern - [INTERN] Creates a BBT descriptor structure * @this: NAND chip to create descriptor for * * This function allocates and initializes a nand_bbt_descr for BBM detection * based on the properties of @this. The new descriptor is stored in * this->badblock_pattern. Thus, this->badblock_pattern should be NULL when * passed to this function.
*/ staticint nand_create_badblock_pattern(struct nand_chip *this)
{ struct nand_bbt_descr *bd; if (this->badblock_pattern) {
pr_warn("Bad block pattern already allocated; not replacing\n"); return -EINVAL;
}
bd = kzalloc(sizeof(*bd), GFP_KERNEL); if (!bd) return -ENOMEM;
bd->options = this->bbt_options & BADBLOCK_SCAN_MASK;
bd->offs = this->badblockpos;
bd->len = (this->options & NAND_BUSWIDTH_16) ? 2 : 1;
bd->pattern = scan_ff_pattern;
bd->options |= NAND_BBT_DYNAMICSTRUCT;
this->badblock_pattern = bd; return 0;
}
/** * nand_create_bbt - [NAND Interface] Select a default bad block table for the device * @this: NAND chip object * * This function selects the default bad block table support for the device and * calls the nand_scan_bbt function.
*/ int nand_create_bbt(struct nand_chip *this)
{ int ret;
/* Is a flash based bad block table requested? */ if (this->bbt_options & NAND_BBT_USE_FLASH) { /* Use the default pattern descriptors */ if (!this->bbt_td) { if (this->bbt_options & NAND_BBT_NO_OOB) {
this->bbt_td = &bbt_main_no_oob_descr;
this->bbt_md = &bbt_mirror_no_oob_descr;
} else {
this->bbt_td = &bbt_main_descr;
this->bbt_md = &bbt_mirror_descr;
}
}
} else {
this->bbt_td = NULL;
this->bbt_md = NULL;
}
if (!this->badblock_pattern) {
ret = nand_create_badblock_pattern(this); if (ret) return ret;
}
/** * nand_isreserved_bbt - [NAND Interface] Check if a block is reserved * @this: NAND chip object * @offs: offset in the device
*/ int nand_isreserved_bbt(struct nand_chip *this, loff_t offs)
{ int block;
/** * nand_isbad_bbt - [NAND Interface] Check if a block is bad * @this: NAND chip object * @offs: offset in the device * @allowbbt: allow access to bad block table region
*/ int nand_isbad_bbt(struct nand_chip *this, loff_t offs, int allowbbt)
{ int block, res;
block = (int)(offs >> this->bbt_erase_shift);
res = bbt_get_entry(this, block);
pr_debug("nand_isbad_bbt(): bbt info for offs 0x%08x: (block %d) 0x%02x\n",
(unsignedint)offs, block, res);
if (mtd_check_expert_analysis_mode()) return 0;
switch (res) { case BBT_BLOCK_GOOD: return 0; case BBT_BLOCK_WORN: return 1; case BBT_BLOCK_RESERVED: return allowbbt ? 0 : 1;
} return 1;
}
/** * nand_markbad_bbt - [NAND Interface] Mark a block bad in the BBT * @this: NAND chip object * @offs: offset of the bad block
*/ int nand_markbad_bbt(struct nand_chip *this, loff_t offs)
{ int block, ret = 0;
block = (int)(offs >> this->bbt_erase_shift);
/* Mark bad block in memory */
bbt_mark_entry(this, block, BBT_BLOCK_WORN);
/* Update flash-based bad block table */ if (this->bbt_options & NAND_BBT_USE_FLASH)
ret = nand_update_bbt(this, offs);
return ret;
}
Messung V0.5
¤ Dauer der Verarbeitung: 0.6 Sekunden
(vorverarbeitet)
¤
Die Informationen auf dieser Webseite wurden
nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit,
noch Qualität der bereit gestellten Informationen zugesichert.
Bemerkung:
Die farbliche Syntaxdarstellung und die Messung sind noch experimentell.
