From 6d3fa0dfdd3cc0e5067785fcb9ca6267b1501fa4 Mon Sep 17 00:00:00 2001
From: Joe Hershberger <joe.hershberger@ni.com>
Date: Mon, 6 Nov 2017 18:16:10 -0800
Subject: [PATCH] mtd: nand: zynq: Add support for the NAND lock/unlock
operation
Zynq NAND driver is not support for NAND lock or unlock operation.
Hence, accidentally write into the critical NAND region might cause
data corruption to occur.
This commit is to add NAND lock/unlock command into NAND SMC register
set for NAND lock/unlock operaion.
Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Signed-off-by: Keng Soon Cheah <keng.soon.cheah@ni.com>
Cc: Chen Yee Chew <chen.yee.chew@ni.com>
Cc: Siva Durga Prasad Paladugu <siva.durga.paladugu@xilinx.com>
Cc: Michal Simek <michal.simek@xilinx.com>
Cc: Scott Wood <oss@buserror.net>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
---
drivers/mtd/nand/zynq_nand.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/drivers/mtd/nand/zynq_nand.c b/drivers/mtd/nand/zynq_nand.c
index e6c80b5b5c..076b878244 100644
--- a/drivers/mtd/nand/zynq_nand.c
+++ b/drivers/mtd/nand/zynq_nand.c
@@ -84,6 +84,13 @@
#define ZYNQ_NAND_ECC_BUSY (1 << 6) /* ECC block is busy */
#define ZYNQ_NAND_ECC_MASK 0x00FFFFFF /* ECC value mask */
+#ifndef NAND_CMD_LOCK_TIGHT
+#define NAND_CMD_LOCK_TIGHT 0x2c
+#endif
+
+#ifndef NAND_CMD_LOCK_STATUS
+#define NAND_CMD_LOCK_STATUS 0x7a
+#endif
/* SMC register set */
struct zynq_nand_smc_regs {
@@ -144,6 +151,11 @@ static const struct zynq_nand_command_format zynq_nand_commands[] = {
{NAND_CMD_PARAM, NAND_CMD_NONE, 1, 0},
{NAND_CMD_GET_FEATURES, NAND_CMD_NONE, 1, 0},
{NAND_CMD_SET_FEATURES, NAND_CMD_NONE, 1, 0},
+ {NAND_CMD_LOCK, NAND_CMD_NONE, 0, 0},
+ {NAND_CMD_LOCK_TIGHT, NAND_CMD_NONE, 0, 0},
+ {NAND_CMD_UNLOCK1, NAND_CMD_NONE, 3, 0},
+ {NAND_CMD_UNLOCK2, NAND_CMD_NONE, 3, 0},
+ {NAND_CMD_LOCK_STATUS, NAND_CMD_NONE, 3, 0},
{NAND_CMD_NONE, NAND_CMD_NONE, 0, 0},
/* Add all the flash commands supported by the flash device */
};
--
2.39.5