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mtd: rawnand: Add support for manufacturer specific lock/unlock operation 

Add nand_lock() & nand_unlock() for manufacturer specific lock & unlock
operation while the device supports Block Portection function.

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/1583220084-10890-2-git-send-email-masonccyang@mxic.com.tw
This commit is contained in:
Mason Yang 2020-03-03 15:21:21 +08:00 committed by Miquel Raynal
parent e015d72f32
commit 92270086b7
2 changed files with 39 additions and 2 deletions
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36
drivers/mtd/nand/raw/nand_base.c
View File

@ -4365,6 +4365,38 @@ static void nand_shutdown(struct mtd_info *mtd)
nand_suspend(mtd);
}
/**
* nand_lock - [MTD Interface] Lock the NAND flash
* @mtd: MTD device structure
* @ofs: offset byte address
* @len: number of bytes to lock (must be a multiple of block/page size)
*/
static int nand_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
{
struct nand_chip *chip = mtd_to_nand(mtd);
if (!chip->lock_area)
return -ENOTSUPP;
return chip->lock_area(chip, ofs, len);
}
/**
* nand_unlock - [MTD Interface] Unlock the NAND flash
* @mtd: MTD device structure
* @ofs: offset byte address
* @len: number of bytes to unlock (must be a multiple of block/page size)
*/
static int nand_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
{
struct nand_chip *chip = mtd_to_nand(mtd);
if (!chip->unlock_area)
return -ENOTSUPP;
return chip->unlock_area(chip, ofs, len);
}
/* Set default functions */
static void nand_set_defaults(struct nand_chip *chip)
{
@ -5791,8 +5823,8 @@ static int nand_scan_tail(struct nand_chip *chip)
mtd->_read_oob = nand_read_oob;
mtd->_write_oob = nand_write_oob;
mtd->_sync = nand_sync;
mtd->_lock = NULL;
mtd->_unlock = NULL;
mtd->_lock = nand_lock;
mtd->_unlock = nand_unlock;
mtd->_suspend = nand_suspend;
mtd->_resume = nand_resume;
mtd->_reboot = nand_shutdown;

5
include/linux/mtd/rawnand.h
View File

@ -1077,6 +1077,8 @@ struct nand_legacy {
* @manufacturer: [INTERN] Contains manufacturer information
* @manufacturer.desc: [INTERN] Contains manufacturer's description
* @manufacturer.priv: [INTERN] Contains manufacturer private information
* @lock_area: [REPLACEABLE] specific NAND chip lock operation
* @unlock_area: [REPLACEABLE] specific NAND chip unlock operation
*/
struct nand_chip {
@ -1136,6 +1138,9 @@ struct nand_chip {
const struct nand_manufacturer *desc;
void *priv;
} manufacturer;
int (*lock_area)(struct nand_chip *chip, loff_t ofs, uint64_t len);
int (*unlock_area)(struct nand_chip *chip, loff_t ofs, uint64_t len);
};
extern const struct mtd_ooblayout_ops nand_ooblayout_sp_ops;