From mboxrd@z Thu Jan  1 00:00:00 1970
From: linux@arm.linux.org.uk (Russell King - ARM Linux)
Date: Tue, 21 Dec 2010 10:59:46 +0000
Subject: [PATCH 1/2] ARM: convert dma-mapping to asm-generic API
In-Reply-To: <201012211154.08821.arnd@arndb.de>
References: <1292926802-12326-1-git-send-email-jamie@jamieiles.com>
	<201012211154.08821.arnd@arndb.de>
Message-ID: <20101221105946.GP28157@n2100.arm.linux.org.uk>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On Tue, Dec 21, 2010 at 11:54:08AM +0100, Arnd Bergmann wrote:
> On Tuesday 21 December 2010 11:20:01 Jamie Iles wrote:
> > This converts ARM to use the asm-generic/dma-mapping-common API for
> > the DMA API. As a side effect, this also allows us to take advantage
> > of DMA API debugging (CONFIG_DMA_API_DEBUG).
> > 
> > We have dma_map_ops for normal, non-coherent architectures, fully
> > coherent architectures and architectures that require dmabounce
> > support. A dma_ops field is added to struct dev_archdata so platforms
> > using an ACP can override the dma operations for that device to be
> > fully coherent e.g.
> > 
> >         struct device *my_coherent_device;
> >         my_coherent_device->dev_archdata.dma_ops = &coherent_dma_ops;
> 
> I think what's more important here is the ability to use an IOMMU on
> some devices while other devices are mapped statically.
> 
> I believe at the moment, at least MSM and OMAP support an IOMMU, but
> we don't provide support for that in the DMA mapping interface yet.