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mtd: rawnand: Add support for manufacturer specific suspend/resume operation 

Patch nand_suspend() & nand_resume() to let manufacturers overwrite
suspend/resume operations.

Signed-off-by: Mason Yang <masonccyang@mxic.com.tw>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/1584517348-14486-2-git-send-email-masonccyang@mxic.com.tw
alistair/sensors
Mason Yang 2020-03-18 15:42:27 +08:00 committed by Miquel Raynal
parent 9f9ae0c253
commit adc6162b9a
2 changed files with 17 additions and 4 deletions
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17
drivers/mtd/nand/raw/nand_base.c
View File

@ -4326,16 +4326,22 @@ static int nand_block_markbad(struct mtd_info *mtd, loff_t ofs)
/**
* nand_suspend - [MTD Interface] Suspend the NAND flash
* @mtd: MTD device structure
*
* Returns 0 for success or negative error code otherwise.
*/
static int nand_suspend(struct mtd_info *mtd)
{
struct nand_chip *chip = mtd_to_nand(mtd);
int ret = 0;
mutex_lock(&chip->lock);
chip->suspended = 1;
if (chip->suspend)
ret = chip->suspend(chip);
if (!ret)
chip->suspended = 1;
mutex_unlock(&chip->lock);
return 0;
return ret;
}
/**
@ -4347,11 +4353,14 @@ static void nand_resume(struct mtd_info *mtd)
struct nand_chip *chip = mtd_to_nand(mtd);
mutex_lock(&chip->lock);
if (chip->suspended)
if (chip->suspended) {
if (chip->resume)
chip->resume(chip);
chip->suspended = 0;
else
} else {
pr_err("%s called for a chip which is not in suspended state\n",
__func__);
}
mutex_unlock(&chip->lock);
}

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

@ -1064,6 +1064,8 @@ struct nand_legacy {
* @lock: lock protecting the suspended field. Also used to
* serialize accesses to the NAND device.
* @suspended: set to 1 when the device is suspended, 0 when it's not.
* @suspend: [REPLACEABLE] specific NAND device suspend operation
* @resume: [REPLACEABLE] specific NAND device resume operation
* @bbt: [INTERN] bad block table pointer
* @bbt_td: [REPLACEABLE] bad block table descriptor for flash
* lookup.
@ -1119,6 +1121,8 @@ struct nand_chip {
struct mutex lock;
unsigned int suspended : 1;
int (*suspend)(struct nand_chip *chip);
void (*resume)(struct nand_chip *chip);
uint8_t *oob_poi;
struct nand_controller *controller;