This patch provides support to read a flash config register.
Config register contains a control bits used to verify the different configurations and security features of a device.
User need to get the data through spi_flash_cmd_read_config() based on their usage.
Signed-off-by: Jagannadha Sutradharudu Teki jagannadh.teki@gmail.com --- Changes in v2: none
drivers/mtd/spi/spi_flash.c | 15 +++++++++++++++ drivers/mtd/spi/spi_flash_internal.h | 4 ++++ 2 files changed, 19 insertions(+), 0 deletions(-)
diff --git a/drivers/mtd/spi/spi_flash.c b/drivers/mtd/spi/spi_flash.c index cad6c40..5bddde4 100644 --- a/drivers/mtd/spi/spi_flash.c +++ b/drivers/mtd/spi/spi_flash.c @@ -314,6 +314,21 @@ int spi_flash_cmd_write_config(struct spi_flash *flash, u8 cr) return 0; }
+int spi_flash_cmd_read_config(struct spi_flash *flash, void *data) +{ + u8 cmd; + int ret; + + cmd = CMD_READ_CONFIG; + ret = spi_flash_read_common(flash, &cmd, sizeof(cmd), (void *)data, 1); + if (ret < 0) { + debug("SF: fail to read config register\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 825b398..844e82e 100644 --- a/drivers/mtd/spi/spi_flash_internal.h +++ b/drivers/mtd/spi/spi_flash_internal.h @@ -22,6 +22,7 @@ #define CMD_PAGE_PROGRAM 0x02 #define CMD_WRITE_DISABLE 0x04 #define CMD_READ_STATUS 0x05 +#define CMD_READ_CONFIG 0x35 #define CMD_WRITE_ENABLE 0x06 #define CMD_ERASE_4K 0x20 #define CMD_ERASE_32K 0x52 @@ -83,6 +84,9 @@ int spi_flash_cmd_read_status(struct spi_flash *flash, void *data); /* Program the config register. */ int spi_flash_cmd_write_config(struct spi_flash *flash, u8 cr);
+/* Read the config register */ +int spi_flash_cmd_read_config(struct spi_flash *flash, void *data); + /* * Same as spi_flash_cmd_read() except it also claims/releases the SPI * bus. Used as common part of the ->read() operation.