linux-kernel - [PATCH v2 1/4] mtd: rawnand: Add support manufacturer specific lock/unlock operatoin

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Date:   Mon, 28 Oct 2019 17:55:24 +0800
From:   Mason Yang <masonccyang@...c.com.tw>
To:     miquel.raynal@...tlin.com, richard@....at, marek.vasut@...il.com,
        dwmw2@...radead.org, bbrezillon@...nel.org,
        computersforpeace@...il.com, vigneshr@...com
Cc:     juliensu@...c.com.tw, linux-kernel@...r.kernel.org,
        linux-mtd@...ts.infradead.org, masonccyang@...c.com.tw
Subject: [PATCH v2 1/4] mtd: rawnand: Add support manufacturer specific lock/unlock operatoin

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

Signed-off-by: Mason Yang <masonccyang@...c.com.tw>
---
 drivers/mtd/nand/raw/nand_base.c | 32 ++++++++++++++++++++++++++++++--
 include/linux/mtd/rawnand.h      |  3 +++
 2 files changed, 33 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
index 5c2c30a..5e318ff 100644
--- a/drivers/mtd/nand/raw/nand_base.c
+++ b/drivers/mtd/nand/raw/nand_base.c
@@ -4356,6 +4356,34 @@ static void nand_shutdown(struct mtd_info *mtd)
 	nand_suspend(mtd);
 }
 
+/**
+ * nand_lock - [MTD Interface] Lock the NAND flash
+ * @mtd: MTD device structure
+ */
+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)
+		return -ENOTSUPP;
+
+	return chip->_lock(chip, ofs, len);
+}
+
+/**
+ * nand_unlock - [MTD Interface] Unlock the NAND flash
+ * @mtd: MTD device structure
+ */
+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)
+		return -ENOTSUPP;
+
+	return chip->_unlock(chip, ofs, len);
+}
+
 /* Set default functions */
 static void nand_set_defaults(struct nand_chip *chip)
 {
@@ -5782,8 +5810,8 @@ 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..2430ecd 100644
--- a/include/linux/mtd/rawnand.h
+++ b/include/linux/mtd/rawnand.h
@@ -1136,6 +1136,9 @@ struct nand_chip {
 		const struct nand_manufacturer *desc;
 		void *priv;
 	} manufacturer;
+
+	int (*_lock)(struct nand_chip *chip, loff_t ofs, uint64_t len);
+	int (*_unlock)(struct nand_chip *chip, loff_t ofs, uint64_t len);
 };
 
 extern const struct mtd_ooblayout_ops nand_ooblayout_sp_ops;
-- 
1.9.1