From mboxrd@z Thu Jan  1 00:00:00 1970
From: Przemyslaw Marczak <p.marczak@samsung.com>
Date: Fri, 27 Jun 2014 13:34:13 +0200
Subject: [U-Boot] [PATCH v3 03/11] board:samsung: check the boot device
 and init the right mmc driver.
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On 06/27/2014 11:40 AM, Minkyu Kang wrote:
> Dear Przemyslaw Marczak,
>
> On 26/06/14 23:15, Przemyslaw Marczak wrote:
>> It is possible to boot device using a micro SD or eMMC slots.
>> In this situation, boot device should be registered as a 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>
>> ---
>> Changes V3:
>> - separate two changes into two commits
>> ---
>>   board/samsung/common/board.c | 24 +++++++++++++++++-------
>>   1 file changed, 17 insertions(+), 7 deletions(-)
>>
>> diff --git a/board/samsung/common/board.c b/board/samsung/common/board.c
>> index ecf3f76..f07a900 100644
>> --- a/board/samsung/common/board.c
>> +++ b/board/samsung/common/board.c
>> @@ -251,18 +251,28 @@ int board_mmc_init(bd_t *bis)
>>   {
>>   	int ret;
>>
>> +	if (boot_device() == BOOT_DEVICE_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
>> +	}
>> +
>
> It looks little confused.
> Could you please re-arrange this code like this?
>
> #ifdef CONFIG_SDHCI
> 	if (boot....) {
>
> 	} else {
>
> 	}
> #endif
>
> #ifdef CONFIG_DWMMC
> 	if (boot....) {
>
> 	} else {
>
> 	}
> #endif
>
> Thanks,
> Minkyu Kang.
>

There are few schemes:
- defined SDHCI and DWMMC or
- defined SDHCI only or
- defined DWMMC only or
So I need #ifdefs to take into account those all schemes.
To clean some mess I can do something like this:

static int init_sdhci(void) {
#ifdef CONFIG_SDHCI
	/* mmc initializattion for available channels */
	return exynos_mmc_init(gd->fdt_blob);
#else
	return 0;
#endif
}

static int init_dwmmc(void) {
#ifdef CONFIG_DWMMC
	/* dwmmc initializattion for available channels */
	return exynos_dwmmc_init(gd->fdt_blob);
#else
	return 0;
#endif
}

#ifdef CONFIG_GENERIC_MMC
int board_mmc_init(bd_t *bis)
{
	int ret;

	if (boot_device() == BOOT_DEVICE_SDMMC) {
		ret = init_sdhci();
		ret |= init_dwmmc();
	} else {
		ret = init_dwmmc();
		ret |= init_sdhci();
	}

	if (ret)
		debug("mmc init failed\n");

	return ret;
}
#endif

or with the ternary operator:

int board_mmc_init(bd_t *bis)
{
	int ret;
	int sd_boot = (boot_device() == BOOT_DEVICE_SDMMC);

	sd_boot ? ((ret = init_sdhci()) & (ret |= init_dwmmc()))
		 : ((ret = init_dwmmc()) & (ret |= init_sdhci()));

	if (ret)
		debug("mmc init failed\n");

	return ret;
}


Thank you,
-- 
Przemyslaw Marczak
Samsung R&D Institute Poland
Samsung Electronics
p.marczak at samsung.com