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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;
- @@ -1252,6 +1253,14 @@ 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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