Few of the flashes(Atmel, Macronix and SST) require to
clear BP# bits in flash power ups.
So clear these BP# bits at probe time, so-that the flash
is ready for user operations.
Signed-off-by: Jagannadha Sutradharudu Teki <jaga...@xilinx.com>
---
Changes for v4:
- none
Changes for v3:
- none
Changes for v2:
- none
drivers/mtd/spi/spi_flash_probe.c | 6 ++++++
include/spi_flash.h | 5 +++++
2 files changed, 11 insertions(+)
diff --git a/drivers/mtd/spi/spi_flash_probe.c
b/drivers/mtd/spi/spi_flash_probe.c
index da43fda..14c2222 100644
--- a/drivers/mtd/spi/spi_flash_probe.c
+++ b/drivers/mtd/spi/spi_flash_probe.c
@@ -203,6 +203,12 @@ struct spi_flash *spi_flash_validate_ids(struct spi_slave
*spi, u8 *idcode)
flash->sector_size = params->sector_size;
flash->size = flash->sector_size * params->nr_sectors;
+ /* Flash powers up read-only, so clear BP# bits */
+ if (((params->jedec >> 16) == SPI_FLASH_CFI_MFR_ATMEL) ||
+ ((params->jedec >> 16) == SPI_FLASH_CFI_MFR_MACRONIX) ||
+ ((params->jedec >> 16) == SPI_FLASH_CFI_MFR_SST))
+ spi_flash_cmd_write_status(flash, 0);
+
return flash;
}
diff --git a/include/spi_flash.h b/include/spi_flash.h
index 4f35c30..8de4e8d 100644
--- a/include/spi_flash.h
+++ b/include/spi_flash.h
@@ -17,6 +17,11 @@
#include <linux/types.h>
#include <linux/compiler.h>
+/* SPI flash CFI Manufacture ID's */
+#define SPI_FLASH_CFI_MFR_ATMEL 0x1f
+#define SPI_FLASH_CFI_MFR_MACRONIX 0xc2
+#define SPI_FLASH_CFI_MFR_SST 0xbf
+
/* SST specific macros */
#ifdef CONFIG_SPI_FLASH_SST
# define SST_WP 0x01 /* Supports AAI word program */
--
1.8.3
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