[U-Boot] [U-Boot, v2 3/6] sf: Add status 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 status register.
>
> Status register contains a control bits used to verify
> the progress of flash program and erase operations.
>
> User need to get the data through spi_flash_cmd_read_status()
> 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 |    3 +++
>  2 files changed, 18 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/mtd/spi/spi_flash.c b/drivers/mtd/spi/spi_flash.c
> index 9e8939c..bf5ec4a 100644
> --- a/drivers/mtd/spi/spi_flash.c
> +++ b/drivers/mtd/spi/spi_flash.c
> @@ -264,6 +264,21 @@ int spi_flash_cmd_write_status(struct spi_flash *flash, u8 sr)
>         return 0;
>  }
>
> +int spi_flash_cmd_read_status(struct spi_flash *flash, void *data)
> +{
> +       u8 cmd;
> +       int ret;
> +
> +       cmd = CMD_READ_STATUS;
> +       ret = spi_flash_read_common(flash, &cmd, sizeof(cmd), (void *)data, 1);
> +       if (ret < 0) {
> +               debug("SF: fail to read status 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 141cfa8..8232595 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);
>
> +/* Read the status register */
> +int spi_flash_cmd_read_status(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
>