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Re: mips ide disk dma problem

To: "Tommy S. Christensen" <tommy.christensen@eicon.com>
Subject: Re: mips ide disk dma problem
From: Ralf Baechle <ralf@oss.sgi.com>
Date: Tue, 14 Aug 2001 07:17:19 +0200
Cc: Barry Wu <wqb123@yahoo.com>, linux-mips@oss.sgi.com
In-reply-to: <3B782CB0.AA24C7C8@eicon.com>; from tommy.christensen@eicon.com on Mon, Aug 13, 2001 at 09:38:24PM +0200
References: <20010813130729.37581.qmail@web13908.mail.yahoo.com> <3B782CB0.AA24C7C8@eicon.com>
Sender: owner-linux-mips@oss.sgi.com
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On Mon, Aug 13, 2001 at 09:38:24PM +0200, Tommy S. Christensen wrote:

> Barry Wu wrote:
> > I meet problems about mips ide disk. I find dma mode
> > is different from other platform. We have to use
> > dma_cache_wback_inv and vtonocache functions to work
> > under DMA mode, I read pcnet32 ethernet driver,
> > it works like that. I do not know if I have to support
> > ide disk dma, what I have to do?
> 
> Some MIPS'ification is needed to handle the caches.
> You can try the patch below to drivers/block/ide-dma.c.
> 
> I don't know about your IDE controller (our board have 
> a CMD PCI-648), but it may need some special handling also.

You're referencing a function that doesn't exist in the whole kernel.
Aside it's a crude hack anyway.  If you have problems with caches use
the API defined in Documentation/DMA-mapping.txt.

  Ralf

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