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

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Message-ID: <536CC0F1.301@ti.com>
Date:	Fri, 9 May 2014 17:20:09 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Arnd Bergmann <arnd@...db.de>, Jingoo Han <jg1.han@...sung.com>
CC:	"'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

Hi,

On Thursday 08 May 2014 02:48 PM, Arnd Bergmann wrote:
> On Thursday 08 May 2014 18:05:11 Jingoo Han wrote:
>> On Tuesday, May 06, 2014 10:59 PM, Arnd Bergmann wrote:
>>> On Tuesday 06 May 2014 19:03:52 Kishon Vijay Abraham I wrote:
>>>> In DRA7, the cpu sees 32bit address, but the pcie controller can see only 28bit
>>>> address. So whenever the cpu issues a read/write request, the 4 most
>>>> significant bits are used by L3 to determine the target controller.
>>>> For example, the cpu reserves 0x2000_0000 - 0x2FFF_FFFF for PCIe controller but
>>>> the PCIe controller will see only (0x000_0000 - 0xFFF_FFF). So for programming
>>>> the outbound translation window the *base* should be programmed as 0x000_0000.
>>>> Whenever we try to write to say 0x2000_0000, it will be translated to whatever
>>>> we have programmed in the translation window with base as 0x000_0000.
>>>>
>>>> Cc: Bjorn Helgaas <bhelgaas@...gle.com>
>>>> Cc: Marek Vasut <marex@...x.de>
>>>> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
>>>> Acked-by: Jingoo Han <jg1.han@...sung.com>
>>>> Acked-by: Mohit Kumar <mohit.kumar@...com>
>>>
>>> Sorry, but NAK.
>>>
>>> We have a standard 'dma-ranges' property to handle this, so use it.
>>>
>>> See the x-gene PCIe driver patches for an example. Please also talk
>>> to Santosh about it, as he is implementing generic support for
>>> parsing dma-ranges in platform devices at the moment.
>>
>> Hi Arnd,
>>
>> Do you mean the following patch?
>> http://www.spinics.net/lists/kernel/msg1737725.html
>>
> 
> That is the patch Santosh did for platform devices, which is related but not
> what I meant here. For the PCI inbound window setup, please have a look
> at https://lkml.org/lkml/2014/3/19/607

For some reason lkml is not showing any contents. Do you have a different link?

Thanks
Kishon
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