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Subject[PATCH v3 1/4] mtd: rawnand: Add support manufacturer specific lock/unlock operation
Date
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>
Reported-by: kbuild test robot <lkp@intel.com>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
---
drivers/mtd/nand/raw/nand_base.c | 36 ++++++++++++++++++++++++++++++++++--
include/linux/mtd/rawnand.h | 5 +++++
2 files changed, 39 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
index f64e3b6..769be81 100644
--- a/drivers/mtd/nand/raw/nand_base.c
+++ b/drivers/mtd/nand/raw/nand_base.c
@@ -4360,6 +4360,38 @@ 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)
{
@@ -5786,8 +5818,8 @@ 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;
diff --git a/include/linux/mtd/rawnand.h b/include/linux/mtd/rawnand.h
index 4ab9bcc..bc2fa3c 100644
--- a/include/linux/mtd/rawnand.h
+++ b/include/linux/mtd/rawnand.h
@@ -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;
--
1.9.1
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