linux-kernel - Re: [PATCH 06/13] DMAENGINE: driver for the ARM PL080/PL081 PrimeCells

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Date:	Tue, 15 Jun 2010 14:04:54 +0200
From:	Maurus Cuelenaere <mcuelenaere@...il.com>
To:	Jassi Brar <jassisinghbrar@...il.com>
CC:	Kukjin Kim <kgene.kim@...sung.com>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	Dan Williams <dan.j.williams@...el.com>,
	linux-arm-kernel@...ts.infradead.org, yuanyabin1978@...a.com,
	Viresh Kumar <viresh.kumar@...com>,
	Alessandro Rubini <rubini@...pv.it>,
	linux-kernel@...r.kernel.org, Ben Dooks <ben-linux@...ff.org>,
	Peter Pearse <peter.pearse@....com>
Subject: Re: [PATCH 06/13] DMAENGINE: driver for the ARM PL080/PL081 PrimeCells

Op 15-06-10 13:39, Jassi Brar schreef:
> On Tue, Jun 15, 2010 at 8:17 PM, Maurus Cuelenaere
> <mcuelenaere@...il.com> wrote:
>   
>> Op 15-06-10 12:45, Jassi Brar schreef:
>>     
>>> On Tue, Jun 15, 2010 at 7:25 PM, Kukjin Kim <kgene.kim@...sung.com> wrote:
>>>       
>>>> Linus Walleij wrote:
>>>>         
>>>>> This creates a DMAengine driver for the ARM PL080/PL081 PrimeCells
>>>>> based on the implementation earlier submitted by Peter Pearse.
>>>>> This is working like a charm for memcpy on the PB11MPCore, but
>>>>> slave DMA to devices is still not working.
>>>>>
>>>>> This DMA controller is used in mostly unmodified form in the ARM
>>>>> RealView and Versatile platforms, in the ST-Ericsson Nomadik, and
>>>>> in the ST SPEAr platform.
>>>>>
>>>>> It has been converted to use the header from the Samsung PL080
>>>>> derivate instead of its own defintions, and can potentially support
>>>>> several controllers in the same system.
>>>>>
>>>>> Cc: Peter Pearse <peter.pearse@....com>
>>>>> Cc: Ben Dooks <ben-linux@...ff.org>
>>>>> Cc: Kukjin Kim <kgene.kim@...sung.com>
>>>>>           
>>>> Looks good, but please give me some time to test on the board(SMDK6410).
>>>> If any problem, let you know. Of course no problem, will ack.
>>>>         
>>> Samsung doesn't use the DMA API, so this driver is unlikely to work.
>>>       
>> It doesn't indeed, but it could be adapted to be a wrapper around the DMA engine API.
>> Or even better, the drivers could be adapted to use that API.
>>     
> I don't particularly like the idea of making Samsung's drivers use the DMA API.
> IMHO the S3C dma api is better atm.
>   

At the moment it is better, true. But I do think it'd be better to use a
generic API than an arch-specific one.
I'm not familiar enough with both of them to know what functionality is
currently missing but I do think that once the DMA engine API is up to
speed, it should replace the s3c one.

-- 
Maurus Cuelenaere

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