mtd: nand: add lock/unlock routines

Add nand lock / unlock routines. At least 'micron' parts
support this.

Signed-off-by: Vimal Singh <vimalsingh@ti.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index ccab9dfc5217..48bc2c54302c 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -38,6 +38,12 @@ extern void nand_release (struct mtd_info *mtd);
 /* Internal helper for board drivers which need to override command function */
 extern void nand_wait_ready(struct mtd_info *mtd);
 
+/* locks all blockes present in the device */
+extern int nand_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
+
+/* unlocks specified locked blockes */
+extern int nand_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
+
 /* The maximum number of NAND chips in an array */
 #define NAND_MAX_CHIPS          8
 
@@ -82,6 +88,10 @@ extern void nand_wait_ready(struct mtd_info *mtd);
 #define NAND_CMD_ERASE2         0xd0
 #define NAND_CMD_RESET          0xff
 
+#define NAND_CMD_LOCK           0x2a
+#define NAND_CMD_UNLOCK1        0x23
+#define NAND_CMD_UNLOCK2        0x24
+
 /* Extended commands for large page devices */
 #define NAND_CMD_READSTART      0x30
 #define NAND_CMD_RNDOUTSTART    0xE0