From: Yunhui Cui <yunhui....@nxp.com>
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 <yunhui....@nxp.com>
---
drivers/mtd/spi-nor/spi-nor.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index ed0c19c..917f814 100644
--- 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;
@@ -1238,6 +1239,14 @@ int spi_nor_scan(struct spi_nor *nor, const char *name,
enum read_mode mode)
write_sr(nor, 0);
}
+ 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;
--
2.1.0.27.g96db324
