linux-kernel - Re: [PATCH 1/7] DMAENGINE: add generic PrimeCell interface to COH 901 318 v6

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Date:	Tue, 11 May 2010 09:53:23 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	Linus Walleij <linus.walleij@...ricsson.com>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	linux-arm-kernel@...ts.infradead.org, linux-mmc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/7] DMAENGINE: add generic PrimeCell interface to COH 901 
	318 v6

On Tue, May 11, 2010 at 9:37 AM, Dan Williams <dan.j.williams@...el.com> wrote:
> On Sun, May 2, 2010 at 5:54 PM, Linus Walleij
> <linus.walleij@...ricsson.com> wrote:
>> This extends the DMA engine driver for the COH 901 318 used in the
>> U300 platform with the generic PrimeCell interface.
>>
>> Signed-off-by: Linus Walleij <linus.walleij@...ricsson.com>
>> ---
>>  drivers/dma/coh901318.c |  146 +++++++++++++++++++++++++++++++++++++++++++++++
>>  1 files changed, 146 insertions(+), 0 deletions(-)
>>
>> diff --git a/drivers/dma/coh901318.c b/drivers/dma/coh901318.c
>> index 4233440..1d5ed16 100644
>> --- a/drivers/dma/coh901318.c
>> +++ b/drivers/dma/coh901318.c
> [..]
>> +void dma_set_ambaconfig(struct dma_chan *chan,
>> +                       struct amba_dma_channel_config *config)
>
> What happens when two primecell dma devices are present on one soc?
> Can that happen?  In that case we'll have conflicting providers of
> dma_set_ambaconfig().
>

...the ->device_control() method is already approaching an ioctl()
let's just add the argument parameter to complete the capability,
i.e.:

int (*device_control)(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
unsigned long arg);

This might also be useful be useful for the mux case to change that
configuration at runtime.

--
Dan
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