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Date: Fri, 9 May 2014 17:20:09 +0530
From: Kishon Vijay Abraham I <kishon@ti.com>
MIME-Version: 1.0
To: Arnd Bergmann <arnd@arndb.de>, Jingoo Han <jg1.han@samsung.com>
CC: "'Santosh Shilimkar'" <santosh.shilimkar@ti.com>,
	<devicetree@vger.kernel.org>, <linux-doc@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>,
	<linux-omap@vger.kernel.org>, <linux-pci@vger.kernel.org>,
	<rogerq@ti.com>, <balajitk@ti.com>,
	"'Bjorn Helgaas'" <bhelgaas@google.com>,
	"'Marek Vasut'" <marex@denx.de>
Subject: Re: [PATCH 06/17] pci: host: pcie-designware: Use *base-mask* for
 configuring the iATU
References: <1399383244-14556-1-git-send-email-kishon@ti.com> <4764413.ZAEU5S5p0p@wuerfel> <000201cf6a9c$9dd295e0$d977c1a0$%han@samsung.com> <6882241.amuhzvbd8n@wuerfel>
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Sender: linux-kernel-owner@vger.kernel.org
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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@google.com>
>>>> Cc: Marek Vasut <marex@denx.de>
>>>> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
>>>> Acked-by: Jingoo Han <jg1.han@samsung.com>
>>>> Acked-by: Mohit Kumar <mohit.kumar@st.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