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mtd: nand: Create a NAND reset function

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When NAND devices are resetted some initialization may have to be done,
like for example they have to be configured for the timing mode that
shall be used. To get a common place where this initialization can be
implemented create a nand_reset() function. This currently only issues
a NAND_CMD_RESET to the NAND device. The places issuing this command
manually are replaced with a call to nand_reset().

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
This commit is contained in:
Sascha Hauer 2016-09-15 10:32:45 +02:00 committed by Boris Brezillon
parent 7902259183
commit 2f94abfe35
2 changed files with 24 additions and 5 deletions
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25
drivers/mtd/nand/nand_base.c
View File

@ -947,6 +947,21 @@ static int nand_wait(struct mtd_info *mtd, struct nand_chip *chip)
return status;
}
/**
* nand_reset - Reset and initialize a NAND device
* @chip: The NAND chip
*
* Returns 0 for success or negative error code otherwise
*/
int nand_reset(struct nand_chip *chip)
{
struct mtd_info *mtd = nand_to_mtd(chip);
chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1);
return 0;
}
/**
* __nand_unlock - [REPLACEABLE] unlocks specified locked blocks
* @mtd: mtd info
@ -1025,7 +1040,7 @@ int nand_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
* some operation can also clear the bit 7 of status register
* eg. erase/program a locked block
*/
chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1);
nand_reset(chip);
/* Check, if it is write protected */
if (nand_check_wp(mtd)) {
@ -1084,7 +1099,7 @@ int nand_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
* some operation can also clear the bit 7 of status register
* eg. erase/program a locked block
*/
chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1);
nand_reset(chip);
/* Check, if it is write protected */
if (nand_check_wp(mtd)) {
@ -2782,7 +2797,7 @@ static int nand_do_write_oob(struct mtd_info *mtd, loff_t to,
* if we don't do this. I have no clue why, but I seem to have 'fixed'
* it in the doc2000 driver in August 1999. dwmw2.
*/
chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1);
nand_reset(chip);
/* Check, if it is write protected */
if (nand_check_wp(mtd)) {
@ -3822,7 +3837,7 @@ static struct nand_flash_dev *nand_get_flash_type(struct mtd_info *mtd,
* Reset the chip, required by some chips (e.g. Micron MT29FxGxxxxx)
* after power-up.
*/
chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1);
nand_reset(chip);
/* Send the command for reading device ID */
chip->cmdfunc(mtd, NAND_CMD_READID, 0x00, -1);
@ -4163,7 +4178,7 @@ int nand_scan_ident(struct mtd_info *mtd, int maxchips,
for (i = 1; i < maxchips; i++) {
chip->select_chip(mtd, i);
/* See comment in nand_get_flash_type for reset */
chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1);
nand_reset(chip);
/* Send the command for reading device ID */
chip->cmdfunc(mtd, NAND_CMD_READID, 0x00, -1);
/* Read manufacturer and device IDs */

4
include/linux/mtd/nand.h
View File

@ -1100,4 +1100,8 @@ int nand_read_oob_std(struct mtd_info *mtd, struct nand_chip *chip, int page);
/* Default read_oob syndrome implementation */
int nand_read_oob_syndrome(struct mtd_info *mtd, struct nand_chip *chip,
int page);
/* Reset and initialize a NAND device */
int nand_reset(struct nand_chip *chip);
#endif /* __LINUX_MTD_NAND_H */