linux-kernel - Re: [PATCH 06/17] pci: host: pcie-designware: Use *base-mask* for configuring the iATU

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Date:	Tue, 13 May 2014 15:27:46 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Kishon Vijay Abraham I <kishon@...com>
Cc:	Jingoo Han <jg1.han@...sung.com>,
	'Santosh Shilimkar' <santosh.shilimkar@...com>,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-omap@...r.kernel.org, linux-pci@...r.kernel.org,
	rogerq@...com, balajitk@...com,
	'Bjorn Helgaas' <bhelgaas@...gle.com>,
	'Marek Vasut' <marex@...x.de>
Subject: Re: [PATCH 06/17] pci: host: pcie-designware: Use *base-mask* for configuring the iATU

On Tuesday 13 May 2014 18:56:23 Kishon Vijay Abraham I wrote:
> > If you have a case where the outbound translation is a 256MB (i.e. 28bit)
> > section of the CPU address space, that could be represented as
> > 
> >       ranges = <0x82000000 0 0  0xb0000000  0 0x10000000>;
> > 
> > or 
> > 
> >       ranges = <0x82000000 0 0xb0000000  0xb0000000  0 0x10000000>;
> > 
> > depending on whether you want the BARs to be programmed using a low
> > address 0x0-0x0fffffff or an address matching the window
> > 0xb0000000-0xbfffffff.
> 
> The problem is, for configuring the window starting at 0xb0000000, the ATU
> should be programmed 0x0000000 (the cpu address for it will be 0xb0000000 though).
> 

Then use the first of the two?

	Arnd
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