[U-Boot] [PATCH v3 02/11] board:samsung: add function boot_device() for checking boot medium

[Minkyu Kang]

Dear Przemyslaw Marczak,

On 26/06/14 23:15, Przemyslaw Marczak wrote:
> It is possible to boot from a few media devices, especially
> using a micro SD or eMMC slots. In this situation depends on
> a boot device - some setup can be changeg.
> 
> This change adds function:
> boot_device() - which returns an OM[1:5] bits value
> 
> This allows checking if boot device is SD(0x2).
> 
> Signed-off-by: Przemyslaw Marczak <p.marczak at samsung.com>
> 
> ---
> Changes v3:
> - new commit after separate one into two
> ---
>  board/samsung/common/board.c | 10 +++++++++-
>  include/samsung/misc.h       |  7 +++++++
>  2 files changed, 16 insertions(+), 1 deletion(-)
> 
> diff --git a/board/samsung/common/board.c b/board/samsung/common/board.c
> index 9dc7c83..ecf3f76 100644
> --- a/board/samsung/common/board.c
> +++ b/board/samsung/common/board.c
> @@ -41,6 +41,13 @@ int __exynos_power_init(void)
>  int exynos_power_init(void)
>  	__attribute__((weak, alias("__exynos_power_init")));
>  
> +unsigned int boot_device(void)
> +{
> +	unsigned int om_stat = samsung_get_base_power();
> +
> +	return BOOT_DEVICE(readl(om_stat));
> +}
> +
>  #if defined CONFIG_EXYNOS_TMU
>  /* Boot Time Thermal Analysis for SoC temperature threshold breach */
>  static void boot_temp_check(void)
> @@ -243,19 +250,20 @@ int board_eth_init(bd_t *bis)
>  int board_mmc_init(bd_t *bis)
>  {
>  	int ret;
> +
>  #ifdef CONFIG_DWMMC
>  	/* dwmmc initializattion for available channels */
>  	ret = exynos_dwmmc_init(gd->fdt_blob);
>  	if (ret)
>  		debug("dwmmc init failed\n");
>  #endif
> -
>  #ifdef CONFIG_SDHCI
>  	/* mmc initializattion for available channels */
>  	ret = exynos_mmc_init(gd->fdt_blob);
>  	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..57bac7d 100644
> --- a/include/samsung/misc.h
> +++ b/include/samsung/misc.h
> @@ -28,4 +28,11 @@ void check_boot_mode(void);
>  void draw_logo(void);
>  #endif
>  
> +#define BOOT_DEVICE_SDMMC	0x2
> +#define BOOT_DEVICE_MASK	0x1f
> +#define BOOT_DEVICE_SHIFT	0x1
> +#define BOOT_DEVICE(x)		(((x) >> BOOT_DEVICE_SHIFT) & BOOT_DEVICE_MASK)
> +
> +unsigned int boot_device(void);

Hm, do we need to make this function to non-static?
If so, it should be placed in power.c - get_om_stat()?

Thanks,
Minkyu Kang.