提交 93edbad6 编写于 作者: M Maxim Levitsky 提交者: David Woodhouse

mtd: Workaround wrong write protect status on some xD cards

Signed-off-by: NMaxim Levitsky <maximlevitsky@gmail.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>
上级 5e81e88a
......@@ -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;
......
......@@ -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)
......
Markdown is supported
0% .
You are about to add 0 people to the discussion. Proceed with caution.
先完成此消息的编辑!
想要评论请 注册