netdev - Re: [PATCH 1/4] ucc_geth: Change private immrbar_virt_to

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Date:	Wed, 7 Feb 2007 10:36:58 -0600
From:	Kumar Gala <galak@...nel.crashing.org>
To:	Li Yang-r58472 <LeoLi@...escale.com>
Cc:	<jeff@...zik.org>, <netdev@...r.kernel.org>,
	<linuxppc-dev@...abs.org>
Subject: Re: [PATCH 1/4] ucc_geth: Change private immrbar_virt_to_phys to generic iopa


On Feb 7, 2007, at 3:34 AM, Li Yang-r58472 wrote:

>> On Feb 6, 2007, at 5:31 AM, Li Yang wrote:
>>
>>> Get rid of private immrbar_virt_to_phys() routine and
>>> use generic iopa().
>>
>> Nack. iopa() isn't that generic, shouldn't we really be using the dma
>> mapping API here?
>
> Do you mean the dma_map_single()?  dma_map_single can map memory space
> correctly, but I don't think it can handle ioremap-ed space.

What are you mapping?  It looks like buffer descriptor rings.  Are  
they being kept in QE sram?  If so that I think you can treat it as  
memory.  (I believe the SRAM behaves like memory, is cache-coherent,  
etc).

- k
-
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