linux-kernel - [PATCH v3 1/4] mtd: rawnand: Add support manufacturer specific lock/unlock operation

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Date:   Tue,  3 Mar 2020 15:21:21 +0800
From:   Mason Yang <masonccyang@...c.com.tw>
To:     miquel.raynal@...tlin.com, richard@....at, vigneshr@...com
Cc:     frieder.schrempf@...tron.de, tglx@...utronix.de, stefan@...er.ch,
        juliensu@...c.com.tw, allison@...utok.net,
        linux-kernel@...r.kernel.org, bbrezillon@...nel.org,
        rfontana@...hat.com, linux-mtd@...ts.infradead.org,
        yuehaibing@...wei.com, s.hauer@...gutronix.de,
        Mason Yang <masonccyang@...c.com.tw>
Subject: [PATCH v3 1/4] mtd: rawnand: Add support 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@...c.com.tw>
Reported-by: kbuild test robot <lkp@...el.com>
Reviewed-by: Miquel Raynal <miquel.raynal@...tlin.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