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mtd: Workaround wrong write protect status on some xD cards 

Signed-off-by: Maxim Levitsky <maximlevitsky@gmail.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Maxim Levitsky 2010-02-22 20:39:40 +02:00 committed by David Woodhouse
parent 5e81e88a4c
commit 93edbad69b
2 changed files with 13 additions and 1 deletions
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8
drivers/mtd/nand/nand_base.c
View File

@ -434,6 +434,11 @@ static int nand_default_block_markbad(struct mtd_info *mtd, loff_t ofs)
static int nand_check_wp(struct mtd_info *mtd)
{
struct nand_chip *chip = mtd->priv;
/* broken xD cards report WP despite being writable */
if (chip->options & NAND_BROKEN_XD)
return 0;
/* Check the WP bit */
chip->cmdfunc(mtd, NAND_CMD_STATUS, -1, -1);
return (chip->read_byte(mtd) & NAND_STATUS_WP) ? 0 : 1;
@ -3175,7 +3180,8 @@ int nand_scan_tail(struct mtd_info *mtd)
/* Fill in remaining MTD driver data */
mtd->type = MTD_NANDFLASH;
mtd->flags = MTD_CAP_NANDFLASH;
mtd->flags = (chip->options & NAND_ROM) ? MTD_CAP_ROM :
MTD_CAP_NANDFLASH;
mtd->erase = nand_erase;
mtd->point = NULL;
mtd->unpoint = NULL;

6
include/linux/mtd/nand.h
View File

@ -182,6 +182,12 @@ typedef enum {
/* Chip does not allow subpage writes */
#define NAND_NO_SUBPAGE_WRITE 0x00000200
/* Device is one of 'new' xD cards that expose fake nand command set */
#define NAND_BROKEN_XD 0x00000400
/* Device behaves just like nand, but is readonly */
#define NAND_ROM 0x00000800
/* Options valid for Samsung large page devices */
#define NAND_SAMSUNG_LP_OPTIONS \
(NAND_NO_PADDING | NAND_CACHEPRG | NAND_COPYBACK)