From mboxrd@z Thu Jan  1 00:00:00 1970
From: =?UTF-8?B?SHVtYmVydG8gTMOzcGV6IExlw7Nu?= <humberto@uclv.cu>
Date: Wed, 26 Aug 2015 09:40:06 -0400
Subject: [U-Boot] DWMMC crontroller in Exynos4412
In-Reply-To: <55DD6282.5090607@samsung.com>
References: <55DCBD93.5050404@uclv.cu>
 <CAPnjgZ2Pe+ymnE9SiEv5A+Zgsir+pijUtNBAa4DcOOOsox7qgg@mail.gmail.com>
 <55DD5B63.4040108@samsung.com> <55DD6282.5090607@samsung.com>
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Hi community,

thank you all for answering my questions.

On 08/26/2015 02:53 AM, Przemyslaw Marczak wrote:
> Hi,
>
> On 08/26/2015 08:23 AM, Jaehoon Chung wrote:
>> On 08/26/2015 11:26 AM, Simon Glass wrote:
>>> +Samsung people
>>>
>>> Hi,
>>>
>>> On 25 August 2015 at 13:10, Humberto L?pez Le?n <humberto@uclv.cu> 
>>> wrote:
>>>> Hi Simon,
>>>> I'm working on implementing a driver for SD/MMC cards in the framework
>>>> GenodeOS. I think you could help me with your experience in this 
>>>> type of
>>>> implementation in the u-boot.
>>>> The hardware platform on which the driver will work is a ODROID-x2
>>>> (exynos4412). I use the DWMMC contoller, but I'm not sure if this 
>>>> is the
>>>> right controller to handle SD/MMC cards in Exynos4412 SoC. The SDHCI
>>>> controller is most appropriate?
>>
>> If you're using exynos4412 board, you can choose sdhci or dwmmc 
>> controller for eMMC, not SD/SDIO.
>> And in my experiment, dwmmc controller is more appropriate than 
>> sdhci.(ex, performance)
>>
>
> It depends which mmc channel is used. In Exynos4412, there are 5 
> channels, but some channel configurations shares GPIO pins:
> - MMC0 - sdhci
> - MMC1 - sdhci, or MMC0 8-bit
> - MMC2 - sdhci - Odroid SD card, 4-bit mode
> - MMC3 - sdhci - or MMC2 8-bit
> - MMC4 - dwmmc, uses MMC0 pins for 4-bit, and MMC0-1 for 8-bit mode
>
> Odroid is using MMC2(sdhci) and MMC0/4(sdhci or dwmmc).
>
> So for eMMC cards you can use the dwmmc, and as Jaehoon wrote it is 
> recommended for the better performance, but for SD card you must use 
> sdhci controller.
This information is valuable to me, but now I would help if you tell me 
where I can find the code of SDHCI controller for the SD card of 
Exynos4412 in U-boat 2015.04-rc2 for a implementationtation reference.  
I was reviewing the file  exynos_dw_mmc.c as reference of DWMMC driver, 
but now I have no idea what the file where the SDHCI driver for the 
exynos4412 is implemented.

Thank you very much for your collaboration.