[U-Boot] [PATCH v2 03/11] board:samsung: check the mmc boot device and init the right mmc driver.

[Minkyu Kang <mk7.kang@samsung.com>]

Dear Przemyslaw Marczak,

On 12/06/14 18:46, Przemyslaw Marczak wrote:
> It is possible to boot from a few media devices, especially using a micro
> SD or eMMC slots. In this situation, boot device should be registered
> as block device 0 in the MMC framework, because CONFIG_SYS_MMC_ENV_DEV
> is usually set to "0" in the most config cases.
> 
> Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>
> Cc: Piotr Wilczek <p.wilczek@samsung.com>
> Cc: Minkyu Kang <mk7.kang@samsung.com>
> ---
>  board/samsung/common/board.c | 32 ++++++++++++++++++++++++--------
>  include/samsung/misc.h       |  5 +++++
>  2 files changed, 29 insertions(+), 8 deletions(-)
> 
> diff --git a/board/samsung/common/board.c b/board/samsung/common/board.c
> index 9dc7c83..2970340 100644
> --- a/board/samsung/common/board.c
> +++ b/board/samsung/common/board.c
> @@ -25,6 +25,8 @@
>  #include <lcd.h>
>  #include <samsung/misc.h>
>  
> +static int bootmode;
> +
>  DECLARE_GLOBAL_DATA_PTR;
>  
>  int __exynos_early_init_f(void)
> @@ -243,19 +245,33 @@ int board_eth_init(bd_t *bis)
>  int board_mmc_init(bd_t *bis)
>  {
>  	int ret;
> +	struct exynos4_power *pwr = (struct exynos4_power *)
> +					samsung_get_base_power();

Hm, no. This file is samsung common not only for exynos4.
Although this code will not be made any problems for other SoCs (because om_stat is always first item of power), it looks weird.
I think you can make new function for getting boot mode.

> +
> +	bootmode = BOOT_MODE(readl(&pwr->om_stat));
> +	if (bootmode == BOOT_SDMMC) {
> +#ifdef CONFIG_SDHCI
> +		/* mmc initializattion for available channels */
> +		ret = exynos_mmc_init(gd->fdt_blob);
> +#endif
>  #ifdef CONFIG_DWMMC
> -	/* dwmmc initializattion for available channels */
> -	ret = exynos_dwmmc_init(gd->fdt_blob);
> -	if (ret)
> -		debug("dwmmc init failed\n");
> +		/* dwmmc initializattion for available channels */
> +		ret = exynos_dwmmc_init(gd->fdt_blob);
> +#endif
> +	} else {
> +#ifdef CONFIG_DWMMC
> +		/* dwmmc initializattion for available channels */
> +		ret = exynos_dwmmc_init(gd->fdt_blob);
>  #endif
> -
>  #ifdef CONFIG_SDHCI
> -	/* mmc initializattion for available channels */
> -	ret = exynos_mmc_init(gd->fdt_blob);
> +		/* mmc initializattion for available channels */
> +		ret = exynos_mmc_init(gd->fdt_blob);
> +#endif
> +	}
> +
>  	if (ret)
>  		debug("mmc init failed\n");
> -#endif
> +
>  	return ret;
>  }
>  #endif
> diff --git a/include/samsung/misc.h b/include/samsung/misc.h
> index 10653a1..87b53ec 100644
> --- a/include/samsung/misc.h
> +++ b/include/samsung/misc.h
> @@ -28,4 +28,9 @@ void check_boot_mode(void);
>  void draw_logo(void);
>  #endif
>  
> +#define BOOT_SDMMC	0x2
> +#define BOOT_MODE_MASK	(0x1f)
> +#define BOOT_MODE_SHIFT	(0x1)
> +#define BOOT_MODE(x)	((x >> BOOT_MODE_SHIFT) & BOOT_MODE_MASK)

((x) >> BOOT_MODE_SHIFT)

> +
>  #endif /* __SAMSUNG_MISC_COMMON_H__ */
> 

Thanks,
Minkyu Kang.