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mtd: nand: hide in-memory BBT implementation details 

nand_base.c shouldn't have to know the implementation details of
nand_bbt's in-memory BBT. Specifically, nand_base shouldn't perform the
bit masking and shifting to isolate a BBT entry.

Instead, just move some of the BBT code into a new nand_markbad_bbt()
interface. This interface allows external users (i.e., nand_base) to
mark a single block as bad in the BBT. Then nand_bbt will take care of
modifying the in-memory BBT and updating the flash-based BBT (if
applicable).

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Brian Norris 2013-07-30 17:52:59 -07:00 committed by David Woodhouse
parent 5a0edb251a
commit b32843b772
3 changed files with 38 additions and 24 deletions
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32
drivers/mtd/nand/nand_base.c
View File

@ -374,22 +374,20 @@ static int nand_default_block_markbad(struct mtd_info *mtd, loff_t ofs)
* block table(s) and/or marker(s)). We only allow the hardware driver to
* specify how to write bad block markers to OOB (chip->block_markbad).
*
* We try operations in the following order, according to our bbt_options
* (NAND_BBT_NO_OOB_BBM and NAND_BBT_USE_FLASH):
* We try operations in the following order:
* (1) erase the affected block, to allow OOB marker to be written cleanly
* (2) update in-memory BBT
* (3) write bad block marker to OOB area of affected block
* (4) update flash-based BBT
* Note that we retain the first error encountered in (3) or (4), finish the
* (2) write bad block marker to OOB area of affected block (unless flag
* NAND_BBT_NO_OOB_BBM is present)
* (3) update the BBT
* Note that we retain the first error encountered in (2) or (3), finish the
* procedures, and dump the error in the end.
*/
static int nand_block_markbad_lowlevel(struct mtd_info *mtd, loff_t ofs)
{
struct nand_chip *chip = mtd->priv;
int block, res, ret = 0;
int write_oob = !(chip->bbt_options & NAND_BBT_NO_OOB_BBM);
int res, ret = 0;
if (write_oob) {
if (!(chip->bbt_options & NAND_BBT_NO_OOB_BBM)) {
struct erase_info einfo;
/* Attempt erase before marking OOB */
@ -398,24 +396,16 @@ static int nand_block_markbad_lowlevel(struct mtd_info *mtd, loff_t ofs)
einfo.addr = ofs;
einfo.len = 1 << chip->phys_erase_shift;
nand_erase_nand(mtd, &einfo, 0);
}
/* Get block number */
block = (int)(ofs >> chip->bbt_erase_shift);
/* Mark block bad in memory-based BBT */
if (chip->bbt)
chip->bbt[block >> 2] |= 0x01 << ((block & 0x03) << 1);
/* Write bad block marker to OOB */
if (write_oob) {
/* Write bad block marker to OOB */
nand_get_device(mtd, FL_WRITING);
ret = chip->block_markbad(mtd, ofs);
nand_release_device(mtd);
}
/* Update flash-based bad block table */
if (chip->bbt_options & NAND_BBT_USE_FLASH) {
res = nand_update_bbt(mtd, ofs);
/* Mark block bad in BBT */
if (chip->bbt) {
res = nand_markbad_bbt(mtd, ofs);
if (!ret)
ret = res;
}

28
drivers/mtd/nand/nand_bbt.c
View File

@ -79,6 +79,8 @@
#define BBT_ENTRY_MASK 0x03
#define BBT_ENTRY_SHIFT 2
static int nand_update_bbt(struct mtd_info *mtd, loff_t offs);
static inline uint8_t bbt_get_entry(struct nand_chip *chip, int block)
{
uint8_t entry = chip->bbt[block >> BBT_ENTRY_SHIFT];
@ -1194,13 +1196,13 @@ int nand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd)
}
/**
* nand_update_bbt - [NAND Interface] update bad block table(s)
* nand_update_bbt - 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)
static int nand_update_bbt(struct mtd_info *mtd, loff_t offs)
{
struct nand_chip *this = mtd->priv;
int len, res = 0;
@ -1390,5 +1392,27 @@ int nand_isbad_bbt(struct mtd_info *mtd, loff_t offs, int allowbbt)
return 1;
}
/**
* nand_markbad_bbt - [NAND Interface] Mark a block bad in the BBT
* @mtd: MTD device structure
* @offs: offset of the bad block
*/
int nand_markbad_bbt(struct mtd_info *mtd, loff_t offs)
{
struct nand_chip *this = mtd->priv;
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(mtd, offs);
return ret;
}
EXPORT_SYMBOL(nand_scan_bbt);
EXPORT_SYMBOL(nand_default_bbt);

2
include/linux/mtd/nand.h
View File

@ -628,8 +628,8 @@ extern struct nand_flash_dev nand_flash_ids[];
extern struct nand_manufacturers nand_manuf_ids[];
extern int nand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd);
extern int nand_update_bbt(struct mtd_info *mtd, loff_t offs);
extern int nand_default_bbt(struct mtd_info *mtd);
extern int nand_markbad_bbt(struct mtd_info *mtd, loff_t offs);
extern int nand_isbad_bbt(struct mtd_info *mtd, loff_t offs, int allowbbt);
extern int nand_erase_nand(struct mtd_info *mtd, struct erase_info *instr,
int allowbbt);