linux-kernel - Re: [PATCH 02/03] CM-x270: ITE 8152 PCI bridge support

Open Source and information security mailing list archives

Date:	Fri, 21 Sep 2007 22:11:59 +0200
From:	"Mike Rapoport" <mike.rapoport@...il.com>
To:	unlisted-recipients:; (no To-header on input)
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 02/03] CM-x270: ITE 8152 PCI bridge support

On 9/21/07, Russell King - ARM Linux <linux@....linux.org.uk> wrote:
> On Fri, Sep 21, 2007 at 12:42:55PM +0200, Guennadi Liakhovetski wrote:
> > On Thu, 20 Sep 2007, Mike Rapoport wrote:
> >
> > > This patch provides driver for ITE 8152 PCI bridge.
> > >
> > > Signed-off-by: Mike Rapoport <mike@...pulab.co.il>
> > >
> > >  arch/arm/common/Makefile          |    1 +
> > >  arch/arm/common/it8152.c          |  387 +++++++++++++++++++++++++++++++++++++
> >
> > Shouldn't it go to drivers/pci and define a platform driver? it8152 is not
> > an ARM specific controller.
>
> drivers/pci is currently only used for the PCI bus infrastructure.  The
> setup of host bridges is very platform dependent.
>
> Also note that you should *avoid* DMA bounce wherever possible.
> The code is broken as designed.  Ensure that the DMA mask is set
> appropriately, and then moan elsewhere if things don't work.

That's more or less what I'm trying to do. ITE chip allows to address
up to 64Mbyte, so I have to ensure that *no* PCI device will ever try
to DMA above that limit.
I don't see other way to ensure it.

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-- 
	Sincerely Yours,
		Mike.
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