[U-Boot] [U-Boot, v2 5/6] sf: Add config register reading support

[Jagan Teki]

Tested on real hardware, works fine.

Tested-by: Jagannadha Sutradharudu Teki <jagannadh.teki at gmail.com>

Thanks,
Jagan.

On Wed, Dec 19, 2012 at 9:57 PM, Jagannadha Sutradharudu Teki
<jagannadh.teki at gmail.com> wrote:
> 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 at 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.
> --
> 1.7.0.4
>