nand: Merge changes to BBT from Linux nand driver
[backport from linux commit 02f8c6aee8df3cdc935e9bdd4f2d020306035dbe] This patch synchronizes the nand driver with the Linux 3.0 state. Signed-off-by: Christian Hitz <christian.hitz@aizo.com> Cc: Scott Wood <scottwood@freescale.com> Signed-off-by: Scott Wood <scottwood@freescale.com>
This commit is contained in:
Christian Hitz
Scott Wood
parent
2a8e0fc8b3
commit
ff8a8a7183
@ -13,27 +13,36 @@
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* Description:
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*
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* When nand_scan_bbt is called, then it tries to find the bad block table
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* depending on the options in the bbt descriptor(s). If a bbt is found
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* then the contents are read and the memory based bbt is created. If a
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* mirrored bbt is selected then the mirror is searched too and the
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* versions are compared. If the mirror has a greater version number
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* than the mirror bbt is used to build the memory based bbt.
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* depending on the options in the BBT descriptor(s). If no flash based BBT
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* (NAND_USE_FLASH_BBT) is specified then the device is scanned for factory
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* marked good / bad blocks. This information is used to create a memory BBT.
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* Once a new bad block is discovered then the "factory" information is updated
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* on the device.
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* If a flash based BBT is specified then the function first tries to find the
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* BBT on flash. If a BBT is found then the contents are read and the memory
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* based BBT is created. If a mirrored BBT is selected then the mirror is
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* searched too and the versions are compared. If the mirror has a greater
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* version number than the mirror BBT is used to build the memory based BBT.
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* If the tables are not versioned, then we "or" the bad block information.
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* If one of the bbt's is out of date or does not exist it is (re)created.
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* If no bbt exists at all then the device is scanned for factory marked
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* If one of the BBTs is out of date or does not exist it is (re)created.
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* If no BBT exists at all then the device is scanned for factory marked
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* good / bad blocks and the bad block tables are created.
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*
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* For manufacturer created bbts like the one found on M-SYS DOC devices
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* the bbt is searched and read but never created
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* For manufacturer created BBTs like the one found on M-SYS DOC devices
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* the BBT is searched and read but never created
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*
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* The autogenerated bad block table is located in the last good blocks
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* The auto generated bad block table is located in the last good blocks
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* of the device. The table is mirrored, so it can be updated eventually.
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* The table is marked in the oob area with an ident pattern and a version
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* number which indicates which of both tables is more up to date.
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* The table is marked in the OOB area with an ident pattern and a version
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* number which indicates which of both tables is more up to date. If the NAND
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* controller needs the complete OOB area for the ECC information then the
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* option NAND_USE_FLASH_BBT_NO_OOB should be used: it moves the ident pattern
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* and the version byte into the data area and the OOB area will remain
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* untouched.
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*
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* The table uses 2 bits per block
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* 11b: block is good
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* 00b: block is factory marked bad
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* 11b: block is good
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* 00b: block is factory marked bad
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* 01b, 10b: block is marked bad due to wear
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*
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* The memory bad block table uses the following scheme:
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@ -55,9 +64,21 @@
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#include <linux/mtd/compat.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/nand.h>
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#include <linux/mtd/nand_ecc.h>
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#include <linux/bitops.h>
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#include <asm/errno.h>
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static int check_pattern_no_oob(uint8_t *buf, struct nand_bbt_descr *td)
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{
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int ret;
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ret = memcmp(buf, td->pattern, td->len);
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if (!ret)
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return ret;
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return -1;
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}
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/**
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* check_pattern - [GENERIC] check if a pattern is in the buffer
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* @buf: the buffer to search
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@ -76,6 +97,9 @@ static int check_pattern(uint8_t *buf, int len, int paglen, struct nand_bbt_desc
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int i, end = 0;
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uint8_t *p = buf;
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if (td->options & NAND_BBT_NO_OOB)
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return check_pattern_no_oob(buf, td);
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end = paglen + td->offs;
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if (td->options & NAND_BBT_SCANEMPTY) {
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for (i = 0; i < end; i++) {
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@ -91,6 +115,28 @@ static int check_pattern(uint8_t *buf, int len, int paglen, struct nand_bbt_desc
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return -1;
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}
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/* Check both positions 1 and 6 for pattern? */
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if (td->options & NAND_BBT_SCANBYTE1AND6) {
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if (td->options & NAND_BBT_SCANEMPTY) {
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p += td->len;
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end += NAND_SMALL_BADBLOCK_POS - td->offs;
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/* Check region between positions 1 and 6 */
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for (i = 0; i < NAND_SMALL_BADBLOCK_POS - td->offs - td->len;
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i++) {
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if (*p++ != 0xff)
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return -1;
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}
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}
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else {
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p += NAND_SMALL_BADBLOCK_POS - td->offs;
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}
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/* Compare the pattern */
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for (i = 0; i < td->len; i++) {
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if (p[i] != td->pattern[i])
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return -1;
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}
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}
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if (td->options & NAND_BBT_SCANEMPTY) {
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p += td->len;
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end += td->len;
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@ -122,36 +168,74 @@ static int check_short_pattern(uint8_t *buf, struct nand_bbt_descr *td)
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if (p[td->offs + i] != td->pattern[i])
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return -1;
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}
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/* Need to check location 1 AND 6? */
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if (td->options & NAND_BBT_SCANBYTE1AND6) {
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for (i = 0; i < td->len; i++) {
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if (p[NAND_SMALL_BADBLOCK_POS + i] != td->pattern[i])
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return -1;
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}
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}
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return 0;
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}
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/**
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* add_marker_len - compute the length of the marker in data area
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* @td: BBT descriptor used for computation
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*
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* The length will be 0 if the markeris located in OOB area.
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*/
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static u32 add_marker_len(struct nand_bbt_descr *td)
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{
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u32 len;
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if (!(td->options & NAND_BBT_NO_OOB))
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return 0;
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len = td->len;
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if (td->options & NAND_BBT_VERSION)
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len++;
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return len;
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}
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/**
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* read_bbt - [GENERIC] Read the bad block table starting from page
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* @mtd: MTD device structure
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* @buf: temporary buffer
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* @page: the starting page
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* @num: the number of bbt descriptors to read
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* @bits: number of bits per block
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* @td: the bbt describtion table
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* @offs: offset in the memory table
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* @reserved_block_code: Pattern to identify reserved blocks
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*
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* Read the bad block table starting from page.
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*
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*/
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static int read_bbt(struct mtd_info *mtd, uint8_t *buf, int page, int num,
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int bits, int offs, int reserved_block_code)
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struct nand_bbt_descr *td, int offs)
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{
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int res, i, j, act = 0;
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struct nand_chip *this = mtd->priv;
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size_t retlen, len, totlen;
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loff_t from;
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int bits = td->options & NAND_BBT_NRBITS_MSK;
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uint8_t msk = (uint8_t) ((1 << bits) - 1);
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u32 marker_len;
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int reserved_block_code = td->reserved_block_code;
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totlen = (num * bits) >> 3;
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marker_len = add_marker_len(td);
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from = ((loff_t) page) << this->page_shift;
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while (totlen) {
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len = min(totlen, (size_t) (1 << this->bbt_erase_shift));
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if (marker_len) {
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/*
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* In case the BBT marker is not in the OOB area it
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* will be just in the first page.
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*/
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len -= marker_len;
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from += marker_len;
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marker_len = 0;
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}
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res = mtd->read(mtd, from, len, &retlen, buf);
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if (res < 0) {
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if (retlen != len) {
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@ -170,9 +254,7 @@ static int read_bbt(struct mtd_info *mtd, uint8_t *buf, int page, int num,
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continue;
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if (reserved_block_code && (tmp == reserved_block_code)) {
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printk(KERN_DEBUG "nand_read_bbt: Reserved block at 0x%012llx\n",
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(loff_t)((offs << 2) +
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(act >> 1)) <<
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this->bbt_erase_shift);
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(loff_t)((offs << 2) + (act >> 1)) << this->bbt_erase_shift);
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this->bbt[offs + (act >> 3)] |= 0x2 << (act & 0x06);
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mtd->ecc_stats.bbtblocks++;
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continue;
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@ -180,8 +262,7 @@ static int read_bbt(struct mtd_info *mtd, uint8_t *buf, int page, int num,
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/* Leave it for now, if its matured we can move this
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* message to MTD_DEBUG_LEVEL0 */
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printk(KERN_DEBUG "nand_read_bbt: Bad block at 0x%012llx\n",
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(loff_t)((offs << 2) + (act >> 1)) <<
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this->bbt_erase_shift);
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(loff_t)((offs << 2) + (act >> 1)) << this->bbt_erase_shift);
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/* Factory marked bad or worn out ? */
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if (tmp == 0)
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this->bbt[offs + (act >> 3)] |= 0x3 << (act & 0x06);
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@ -211,42 +292,86 @@ static int read_abs_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_desc
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{
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struct nand_chip *this = mtd->priv;
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int res = 0, i;
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int bits;
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bits = td->options & NAND_BBT_NRBITS_MSK;
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if (td->options & NAND_BBT_PERCHIP) {
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int offs = 0;
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for (i = 0; i < this->numchips; i++) {
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if (chip == -1 || chip == i)
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res = read_bbt (mtd, buf, td->pages[i], this->chipsize >> this->bbt_erase_shift, bits, offs, td->reserved_block_code);
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res = read_bbt(mtd, buf, td->pages[i],
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this->chipsize >> this->bbt_erase_shift,
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td, offs);
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if (res)
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return res;
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offs += this->chipsize >> (this->bbt_erase_shift + 2);
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}
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} else {
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res = read_bbt (mtd, buf, td->pages[0], mtd->size >> this->bbt_erase_shift, bits, 0, td->reserved_block_code);
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res = read_bbt(mtd, buf, td->pages[0],
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mtd->size >> this->bbt_erase_shift, td, 0);
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if (res)
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return res;
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}
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return 0;
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}
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/*
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* BBT marker is in the first page, no OOB.
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*/
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static int scan_read_raw_data(struct mtd_info *mtd, uint8_t *buf, loff_t offs,
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struct nand_bbt_descr *td)
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{
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size_t retlen;
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size_t len;
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len = td->len;
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if (td->options & NAND_BBT_VERSION)
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len++;
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return mtd->read(mtd, offs, len, &retlen, buf);
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}
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/*
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* Scan read raw data from flash
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*/
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static int scan_read_raw(struct mtd_info *mtd, uint8_t *buf, loff_t offs,
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static int scan_read_raw_oob(struct mtd_info *mtd, uint8_t *buf, loff_t offs,
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size_t len)
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{
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struct mtd_oob_ops ops;
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int res;
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ops.mode = MTD_OOB_RAW;
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ops.ooboffs = 0;
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ops.ooblen = mtd->oobsize;
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ops.oobbuf = buf;
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ops.datbuf = buf;
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ops.len = len;
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return mtd->read_oob(mtd, offs, &ops);
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while (len > 0) {
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if (len <= mtd->writesize) {
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ops.oobbuf = buf + len;
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ops.datbuf = buf;
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ops.len = len;
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return mtd->read_oob(mtd, offs, &ops);
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} else {
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ops.oobbuf = buf + mtd->writesize;
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ops.datbuf = buf;
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ops.len = mtd->writesize;
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res = mtd->read_oob(mtd, offs, &ops);
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if (res)
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return res;
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}
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buf += mtd->oobsize + mtd->writesize;
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len -= mtd->writesize;
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}
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return 0;
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}
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static int scan_read_raw(struct mtd_info *mtd, uint8_t *buf, loff_t offs,
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size_t len, struct nand_bbt_descr *td)
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{
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if (td->options & NAND_BBT_NO_OOB)
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return scan_read_raw_data(mtd, buf, offs, td);
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else
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return scan_read_raw_oob(mtd, buf, offs, len);
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}
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/*
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@ -267,6 +392,15 @@ static int scan_write_bbt(struct mtd_info *mtd, loff_t offs, size_t len,
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return mtd->write_oob(mtd, offs, &ops);
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}
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static u32 bbt_get_ver_offs(struct mtd_info *mtd, struct nand_bbt_descr *td)
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{
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u32 ver_offs = td->veroffs;
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if (!(td->options & NAND_BBT_NO_OOB))
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ver_offs += mtd->writesize;
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return ver_offs;
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}
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/**
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* read_abs_bbts - [GENERIC] Read the bad block table(s) for all chips starting at a given page
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* @mtd: MTD device structure
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@ -285,18 +419,18 @@ static int read_abs_bbts(struct mtd_info *mtd, uint8_t *buf,
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/* Read the primary version, if available */
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if (td->options & NAND_BBT_VERSION) {
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scan_read_raw(mtd, buf, (loff_t)td->pages[0] <<
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this->page_shift, mtd->writesize);
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td->version[0] = buf[mtd->writesize + td->veroffs];
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scan_read_raw(mtd, buf, (loff_t)td->pages[0] << this->page_shift,
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mtd->writesize, td);
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td->version[0] = buf[bbt_get_ver_offs(mtd, td)];
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printk(KERN_DEBUG "Bad block table at page %d, version 0x%02X\n",
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td->pages[0], td->version[0]);
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}
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/* Read the mirror version, if available */
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if (md && (md->options & NAND_BBT_VERSION)) {
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scan_read_raw(mtd, buf, (loff_t)md->pages[0] <<
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this->page_shift, mtd->writesize);
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md->version[0] = buf[mtd->writesize + md->veroffs];
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scan_read_raw(mtd, buf, (loff_t)md->pages[0] << this->page_shift,
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mtd->writesize, td);
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md->version[0] = buf[bbt_get_ver_offs(mtd, md)];
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printk(KERN_DEBUG "Bad block table at page %d, version 0x%02X\n",
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md->pages[0], md->version[0]);
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}
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@ -312,7 +446,7 @@ static int scan_block_full(struct mtd_info *mtd, struct nand_bbt_descr *bd,
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{
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int ret, j;
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ret = scan_read_raw(mtd, buf, offs, readlen);
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ret = scan_read_raw_oob(mtd, buf, offs, readlen);
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if (ret)
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return ret;
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@ -376,16 +510,14 @@ static int create_bbt(struct mtd_info *mtd, uint8_t *buf,
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loff_t from;
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size_t readlen;
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MTDDEBUG (MTD_DEBUG_LEVEL0, "Scanning device for bad blocks\n");
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MTDDEBUG(MTD_DEBUG_LEVEL0, "Scanning device for bad blocks\n");
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if (bd->options & NAND_BBT_SCANALLPAGES)
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len = 1 << (this->bbt_erase_shift - this->page_shift);
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else {
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if (bd->options & NAND_BBT_SCAN2NDPAGE)
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len = 2;
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else
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len = 1;
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}
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else if (bd->options & NAND_BBT_SCAN2NDPAGE)
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len = 2;
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else
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len = 1;
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if (!(bd->options & NAND_BBT_SCANEMPTY)) {
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/* We need only read few bytes from the OOB area */
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@ -415,9 +547,14 @@ static int create_bbt(struct mtd_info *mtd, uint8_t *buf,
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from = (loff_t)startblock << (this->bbt_erase_shift - 1);
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}
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if (this->options & NAND_BBT_SCANLASTPAGE)
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from += mtd->erasesize - (mtd->writesize * len);
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for (i = startblock; i < numblocks;) {
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int ret;
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BUG_ON(bd->options & NAND_BBT_NO_OOB);
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if (bd->options & NAND_BBT_SCANALLPAGES)
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ret = scan_block_full(mtd, bd, from, buf, readlen,
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scanlen, len);
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@ -429,7 +566,7 @@ static int create_bbt(struct mtd_info *mtd, uint8_t *buf,
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if (ret) {
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this->bbt[i >> 3] |= 0x03 << (i & 0x6);
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MTDDEBUG (MTD_DEBUG_LEVEL0,
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MTDDEBUG(MTD_DEBUG_LEVEL0,
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"Bad eraseblock %d at 0x%012llx\n",
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i >> 1, (unsigned long long)from);
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mtd->ecc_stats.badblocks++;
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@ -497,11 +634,12 @@ static int search_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr
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loff_t offs = (loff_t)actblock << this->bbt_erase_shift;
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/* Read first page */
|
||||
scan_read_raw(mtd, buf, offs, mtd->writesize);
|
||||
scan_read_raw(mtd, buf, offs, mtd->writesize, td);
|
||||
if (!check_pattern(buf, scanlen, mtd->writesize, td)) {
|
||||
td->pages[i] = actblock << blocktopage;
|
||||
if (td->options & NAND_BBT_VERSION) {
|
||||
td->version[i] = buf[mtd->writesize + td->veroffs];
|
||||
offs = bbt_get_ver_offs(mtd, td);
|
||||
td->version[i] = buf[offs];
|
||||
}
|
||||
break;
|
||||
}
|
||||
@ -685,12 +823,26 @@ static int write_bbt(struct mtd_info *mtd, uint8_t *buf,
|
||||
memset(&buf[offs], 0xff, (size_t) (numblocks >> sft));
|
||||
ooboffs = len + (pageoffs * mtd->oobsize);
|
||||
|
||||
} else if (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 = (len + (mtd->writesize - 1)) &
|
||||
~(mtd->writesize - 1);
|
||||
len = ALIGN(len, mtd->writesize);
|
||||
/* Preset the buffer with 0xff */
|
||||
memset(buf, 0xff, len +
|
||||
(len >> this->page_shift)* mtd->oobsize);
|
||||
@ -724,13 +876,14 @@ static int write_bbt(struct mtd_info *mtd, uint8_t *buf,
|
||||
if (res < 0)
|
||||
goto outerr;
|
||||
|
||||
res = scan_write_bbt(mtd, to, len, buf, &buf[len]);
|
||||
res = scan_write_bbt(mtd, to, len, buf,
|
||||
td->options & NAND_BBT_NO_OOB ? NULL :
|
||||
&buf[len]);
|
||||
if (res < 0)
|
||||
goto outerr;
|
||||
|
||||
printk(KERN_DEBUG "Bad block table written to 0x%012llx, "
|
||||
"version 0x%02X\n", (unsigned long long)to,
|
||||
td->version[chip]);
|
||||
printk(KERN_DEBUG "Bad block table written to 0x%012llx, version "
|
||||
"0x%02X\n", (unsigned long long)to, td->version[chip]);
|
||||
|
||||
/* Mark it as used */
|
||||
td->pages[chip] = page;
|
||||
@ -791,7 +944,7 @@ static int check_create(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_desc
|
||||
rd2 = NULL;
|
||||
/* Per chip or per device ? */
|
||||
chipsel = (td->options & NAND_BBT_PERCHIP) ? i : -1;
|
||||
/* Mirrored table avilable ? */
|
||||
/* Mirrored table available ? */
|
||||
if (md) {
|
||||
if (td->pages[i] == -1 && md->pages[i] == -1) {
|
||||
writeops = 0x03;
|
||||
@ -845,7 +998,8 @@ static int check_create(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_desc
|
||||
continue;
|
||||
|
||||
/* Create the table in memory by scanning the chip(s) */
|
||||
create_bbt(mtd, buf, bd, chipsel);
|
||||
if (!(this->options & NAND_CREATE_EMPTY_BBT))
|
||||
create_bbt(mtd, buf, bd, chipsel);
|
||||
|
||||
td->version[i] = 1;
|
||||
if (md)
|
||||
@ -910,8 +1064,7 @@ static void mark_bbt_region(struct mtd_info *mtd, struct nand_bbt_descr *td)
|
||||
newval = oldval | (0x2 << (block & 0x06));
|
||||
this->bbt[(block >> 3)] = newval;
|
||||
if ((oldval != newval) && td->reserved_block_code)
|
||||
nand_update_bbt(mtd, (loff_t)block <<
|
||||
(this->bbt_erase_shift - 1));
|
||||
nand_update_bbt(mtd, (loff_t)block << (this->bbt_erase_shift - 1));
|
||||
continue;
|
||||
}
|
||||
update = 0;
|
||||
@ -932,11 +1085,58 @@ static void mark_bbt_region(struct mtd_info *mtd, struct nand_bbt_descr *td)
|
||||
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, (loff_t)(block - 2) <<
|
||||
(this->bbt_erase_shift - 1));
|
||||
nand_update_bbt(mtd, (loff_t)(block - 2) << (this->bbt_erase_shift - 1));
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* verify_bbt_descr - verify the bad block description
|
||||
* @mtd: MTD device structure
|
||||
* @bd: the table to verify
|
||||
*
|
||||
* This functions performs a few sanity checks on the bad block description
|
||||
* table.
|
||||
*/
|
||||
static void verify_bbt_descr(struct mtd_info *mtd, struct nand_bbt_descr *bd)
|
||||
{
|
||||
struct nand_chip *this = mtd->priv;
|
||||
u32 pattern_len;
|
||||
u32 bits;
|
||||
u32 table_size;
|
||||
|
||||
if (!bd)
|
||||
return;
|
||||
|
||||
pattern_len = bd->len;
|
||||
bits = bd->options & NAND_BBT_NRBITS_MSK;
|
||||
|
||||
BUG_ON((this->options & NAND_USE_FLASH_BBT_NO_OOB) &&
|
||||
!(this->options & NAND_USE_FLASH_BBT));
|
||||
BUG_ON(!bits);
|
||||
|
||||
if (bd->options & NAND_BBT_VERSION)
|
||||
pattern_len++;
|
||||
|
||||
if (bd->options & NAND_BBT_NO_OOB) {
|
||||
BUG_ON(!(this->options & NAND_USE_FLASH_BBT));
|
||||
BUG_ON(!(this->options & NAND_USE_FLASH_BBT_NO_OOB));
|
||||
BUG_ON(bd->offs);
|
||||
if (bd->options & NAND_BBT_VERSION)
|
||||
BUG_ON(bd->veroffs != bd->len);
|
||||
BUG_ON(bd->options & NAND_BBT_SAVECONTENT);
|
||||
}
|
||||
|
||||
if (bd->options & NAND_BBT_PERCHIP)
|
||||
table_size = this->chipsize >> this->bbt_erase_shift;
|
||||
else
|
||||
table_size = mtd->size >> this->bbt_erase_shift;
|
||||
table_size >>= 3;
|
||||
table_size *= bits;
|
||||
if (bd->options & NAND_BBT_NO_OOB)
|
||||
table_size += pattern_len;
|
||||
BUG_ON(table_size > (1 << this->bbt_erase_shift));
|
||||
}
|
||||
|
||||
/**
|
||||
* nand_scan_bbt - [NAND Interface] scan, find, read and maybe create bad block table(s)
|
||||
* @mtd: MTD device structure
|
||||
@ -978,6 +1178,8 @@ int nand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd)
|
||||
}
|
||||
return res;
|
||||
}
|
||||
verify_bbt_descr(mtd, td);
|
||||
verify_bbt_descr(mtd, md);
|
||||
|
||||
/* Allocate a temporary buffer for one eraseblock incl. oob */
|
||||
len = (1 << this->bbt_erase_shift);
|
||||
@ -1073,34 +1275,6 @@ int nand_update_bbt(struct mtd_info *mtd, loff_t offs)
|
||||
* 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 = NAND_BBT_SCAN2NDPAGE,
|
||||
.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_SCAN2NDPAGE,
|
||||
.offs = 5,
|
||||
.len = 1,
|
||||
.pattern = scan_ff_pattern
|
||||
};
|
||||
|
||||
static struct nand_bbt_descr largepage_flashbased = {
|
||||
.options = NAND_BBT_SCAN2NDPAGE,
|
||||
.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 = {
|
||||
@ -1135,6 +1309,59 @@ static struct nand_bbt_descr bbt_mirror_descr = {
|
||||
.pattern = mirror_pattern
|
||||
};
|
||||
|
||||
static struct nand_bbt_descr bbt_main_no_bbt_descr = {
|
||||
.options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
|
||||
| NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP
|
||||
| NAND_BBT_NO_OOB,
|
||||
.len = 4,
|
||||
.veroffs = 4,
|
||||
.maxblocks = 4,
|
||||
.pattern = bbt_pattern
|
||||
};
|
||||
|
||||
static struct nand_bbt_descr bbt_mirror_no_bbt_descr = {
|
||||
.options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
|
||||
| NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP
|
||||
| NAND_BBT_NO_OOB,
|
||||
.len = 4,
|
||||
.veroffs = 4,
|
||||
.maxblocks = 4,
|
||||
.pattern = mirror_pattern
|
||||
};
|
||||
|
||||
#define BBT_SCAN_OPTIONS (NAND_BBT_SCANLASTPAGE | NAND_BBT_SCAN2NDPAGE | \
|
||||
NAND_BBT_SCANBYTE1AND6)
|
||||
/**
|
||||
* nand_create_default_bbt_descr - [Internal] 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.
|
||||
*
|
||||
*/
|
||||
static int nand_create_default_bbt_descr(struct nand_chip *this)
|
||||
{
|
||||
struct nand_bbt_descr *bd;
|
||||
if (this->badblock_pattern) {
|
||||
printk(KERN_WARNING "BBT descr already allocated; not replacing.\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
bd = kzalloc(sizeof(*bd), GFP_KERNEL);
|
||||
if (!bd) {
|
||||
printk(KERN_ERR "nand_create_default_bbt_descr: Out of memory\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
bd->options = this->options & BBT_SCAN_OPTIONS;
|
||||
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_default_bbt - [NAND Interface] Select a default bad block table for the device
|
||||
* @mtd: MTD device structure
|
||||
@ -1168,20 +1395,22 @@ int nand_default_bbt(struct mtd_info *mtd)
|
||||
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->writesize > 512) ? &largepage_flashbased : &smallpage_flashbased;
|
||||
if (this->options & NAND_USE_FLASH_BBT_NO_OOB) {
|
||||
this->bbt_td = &bbt_main_no_bbt_descr;
|
||||
this->bbt_md = &bbt_mirror_no_bbt_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) {
|
||||
this->badblock_pattern = (mtd->writesize > 512) ?
|
||||
&largepage_memorybased : &smallpage_memorybased;
|
||||
}
|
||||
}
|
||||
|
||||
if (!this->badblock_pattern)
|
||||
nand_create_default_bbt_descr(this);
|
||||
|
||||
return nand_scan_bbt(mtd, this->badblock_pattern);
|
||||
}
|
||||
|
||||
@ -1202,8 +1431,8 @@ int nand_isbad_bbt(struct mtd_info *mtd, loff_t offs, int allowbbt)
|
||||
block = (int)(offs >> (this->bbt_erase_shift - 1));
|
||||
res = (this->bbt[block >> 3] >> (block & 0x06)) & 0x03;
|
||||
|
||||
MTDDEBUG (MTD_DEBUG_LEVEL2, "nand_isbad_bbt(): bbt info for offs 0x%08x: "
|
||||
"(block %d) 0x%02x\n", (unsigned int)offs, res, block >> 1);
|
||||
MTDDEBUG(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:
|
||||
|
||||
@ -105,6 +105,8 @@ struct nand_bbt_descr {
|
||||
#define NAND_BBT_SCANBYTE1AND6 0x00100000
|
||||
/* The nand_bbt_descr was created dynamicaly and must be freed */
|
||||
#define NAND_BBT_DYNAMICSTRUCT 0x00200000
|
||||
/* The bad block table does not OOB for marker */
|
||||
#define NAND_BBT_NO_OOB 0x00400000
|
||||
|
||||
/* The maximum number of blocks to scan for a bbt */
|
||||
#define NAND_BBT_SCAN_MAXBLOCKS 4
|
||||
|
||||
Loading…
Reference in New Issue
Block a user