This patch provides support to program a flash config register.
Configuration register contains the control bits used to configure
the different configurations and security features of a device.
User need to set these bits through spi_flash_cmd_write_config()
based on their usage.
Signed-off-by: Jagannadha Sutradharudu Teki <jagannadh.t...@gmail.com>
---
drivers/mtd/spi/spi_flash.c | 27 +++++++++++++++++++++++++++
drivers/mtd/spi/spi_flash_internal.h | 3 +++
2 files changed, 30 insertions(+), 0 deletions(-)
diff --git a/drivers/mtd/spi/spi_flash.c b/drivers/mtd/spi/spi_flash.c
index 800ed8b..a8f0af0 100644
--- a/drivers/mtd/spi/spi_flash.c
+++ b/drivers/mtd/spi/spi_flash.c
@@ -274,6 +274,33 @@ int spi_flash_cmd_write_status(struct spi_flash *flash, u8
sr)
return 0;
}
+int spi_flash_cmd_write_config(struct spi_flash *flash, u16 cr)
+{
+ u8 cmd;
+ int ret;
+
+ ret = spi_flash_cmd_write_enable(flash);
+ if (ret < 0) {
+ debug("SF: enabling write failed\n");
+ return ret;
+ }
+
+ cmd = CMD_WRITE_STATUS;
+ ret = spi_flash_cmd_write(flash->spi, &cmd, 1, &cr, 2);
+ if (ret) {
+ debug("SF: fail to write config register\n");
+ return ret;
+ }
+
+ ret = spi_flash_cmd_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT);
+ if (ret < 0) {
+ debug("SF: write config register timed out\n");
+ return ret;
+ }
+
+ return 0;
+}
+
/*
* The following table holds all device probe functions
*
diff --git a/drivers/mtd/spi/spi_flash_internal.h
b/drivers/mtd/spi/spi_flash_internal.h
index 141cfa8..9287778 100644
--- a/drivers/mtd/spi/spi_flash_internal.h
+++ b/drivers/mtd/spi/spi_flash_internal.h
@@ -77,6 +77,9 @@ static inline int spi_flash_cmd_write_disable(struct
spi_flash *flash)
/* Program the status register. */
int spi_flash_cmd_write_status(struct spi_flash *flash, u8 sr);
+/* Program the config register. */
+int spi_flash_cmd_write_config(struct spi_flash *flash, u16 cr);
+
/*
* Same as spi_flash_cmd_read() except it also claims/releases the SPI
* bus. Used as common part of the ->read() operation.
--
1.7.0.4
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