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From e892dea7229d56b75c46a76b9039f9e179584a91 Mon Sep 17 00:00:00 2001
From: Yunhui Cui <B56489@freescale.com>
Date: Mon, 1 Feb 2016 18:48:49 +0800
Subject: [PATCH 100/113] mtd:spi_nor: Disable Micron flash HW protection
For Micron family ,The status register write enable/disable bit,
provides hardware data protection for the device.
When the enable/disable bit is set to 1, the status register
nonvolatile bits become read-only and the WRITE STATUS REGISTER
operation will not execute.
Signed-off-by: Yunhui Cui <B56489@freescale.com>
---
drivers/mtd/spi-nor/spi-nor.c | 9 +++++++++
1 file changed, 9 insertions(+)
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -39,6 +39,7 @@
#define SPI_NOR_MAX_ID_LEN 6
#define SPI_NOR_MAX_ADDR_WIDTH 4
+#define SPI_NOR_MICRON_WRITE_ENABLE 0x7f
struct flash_info {
char *name;
@@ -1246,6 +1247,14 @@ int spi_nor_scan(struct spi_nor *nor, co
if (ret)
return ret;
+ if (JEDEC_MFR(info) == SNOR_MFR_MICRON) {
+ ret = read_sr(nor);
+ ret &= SPI_NOR_MICRON_WRITE_ENABLE;
+
+ write_enable(nor);
+ write_sr(nor, ret);
+ }
+
if (!mtd->name)
mtd->name = dev_name(dev);
mtd->priv = nor;
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