[U-Boot] [U-Boot, v2 4/6] sf: Add configuration register writing 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 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 at gmail.com>
> ---
> Changes in v2:
>         Improved code logic
>
>  drivers/mtd/spi/spi_flash.c          |   35 ++++++++++++++++++++++++++++++++++
>  drivers/mtd/spi/spi_flash_internal.h |    3 ++
>  2 files changed, 38 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/mtd/spi/spi_flash.c b/drivers/mtd/spi/spi_flash.c
> index bf5ec4a..cad6c40 100644
> --- a/drivers/mtd/spi/spi_flash.c
> +++ b/drivers/mtd/spi/spi_flash.c
> @@ -279,6 +279,41 @@ int spi_flash_cmd_read_status(struct spi_flash *flash, void *data)
>         return 0;
>  }
>
> +int spi_flash_cmd_write_config(struct spi_flash *flash, u8 cr)
> +{
> +       u8 data[2];
> +       u8 cmd;
> +       int ret;
> +
> +       ret = spi_flash_cmd_read_status(flash, (void *)&data[0]);
> +       if (ret < 0) {
> +               debug("SF: fail to read status register\n");
> +               return ret;
> +       }
> +
> +       ret = spi_flash_cmd_write_enable(flash);
> +       if (ret < 0) {
> +               debug("SF: enabling write failed\n");
> +               return ret;
> +       }
> +
> +       cmd = CMD_WRITE_STATUS;
> +       data[1] = cr;
> +       ret = spi_flash_cmd_write(flash->spi, &cmd, 1, &data, 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 8232595..825b398 100644
> --- a/drivers/mtd/spi/spi_flash_internal.h
> +++ b/drivers/mtd/spi/spi_flash_internal.h
> @@ -80,6 +80,9 @@ 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);
>
> +/* Program the config register. */
> +int spi_flash_cmd_write_config(struct spi_flash *flash, u8 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
>