From mboxrd@z Thu Jan  1 00:00:00 1970
From: Michael Schmitz <schmitz@biophys.uni-duesseldorf.de>
Subject: Re: [PATCH] ata: libata depends on HAS_DMA
Date: Wed, 13 May 2009 06:12:31 +0200 (CEST)
Message-ID: <alpine.DEB.1.00.0905130610240.18305__14897.7561308586$1242187984$gmane$org@zirkon.biophys.uni-duesseldorf.de>
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To: Brad Boyer <flar@allandria.com>
Cc: Arnd Bergmann <arnd@arndb.de>, Alan Cox <alan@lxorguk.ukuu.org.uk>, linux-kernel@vger.kernel.org, Jeff Garzik <jgarzik@pobox.com>, linux-ide@vger.kernel.org, takata@linux-m32r.org, geert@linux-m68k.org, linux-m68k@lists.linux-m68k.org, ysato@users.sourceforge.jp

Hi,

> > Currently, the only architectures that don't set HAS_DMA are h8300, m32r
> > m68k (except SUN3 and Coldfire), microblaze and s390.
> > s390 will never get it, microblaze is currently implementing dma-mapping.h.
> > 
> > The other three are still using drivers/ide instead of drivers/ata.
> > 
> > One way to fix this would be to implement dma-mapping.h in h8300, m32r and
> > m68k and leave !HAS_DMA as the obscure s390 case (this one already can't
> > use ATA because of !HAS_MMIO).
> 
> If I'm reading the m68k code correctly, SUN3 is the one that doesn't have
> DMA. It is implemented on any m68k with a standard Motorola MMU. It might
> be possible to get the DMA code working on a sun3, but I doubt they ever
> have IDE hardware.

The Atari IDE interface does not use DMA. I don't see what addition of DMA 
mapping for IDE would achieve. 

If it doesn't interfere with plain PIO mode, fine. 

	Michael