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.teki@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.