linux-kernel - Re: [PATCH 3/3] PCI: generic: Add support for Cavium ThunderX PCIe root complexes.

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Message-ID: <5601A5C2.4030206@caviumnetworks.com>
Date:	Tue, 22 Sep 2015 12:02:26 -0700
From:	David Daney <ddaney@...iumnetworks.com>
To:	Will Deacon <will.deacon@....com>
CC:	David Daney <ddaney.cavm@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <Pawel.Moll@....com>,
	Mark Rutland <Mark.Rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Marc Zyngier <Marc.Zyngier@....com>,
	David Daney <david.daney@...ium.com>
Subject: Re: [PATCH 3/3] PCI: generic: Add support for Cavium ThunderX PCIe
 root complexes.

On 09/22/2015 11:52 AM, Will Deacon wrote:
> On Thu, Sep 17, 2015 at 11:41:34PM +0100, David Daney wrote:
>> From: David Daney <david.daney@...ium.com>
>>
>> The config space for external PCIe root complexes on some Cavium
>> ThunderX SoCs is very similar to CAM and ECAM, but differs in the
>> shift values that have to be applied to the bus and devfn numbers to
>> compose that address window offset.  These root complexes also have
>> the interesting property that there is no root bridge, so the standard
>> manner of limiting scanning to only the first device doesn't work.  We
>> can use the standard pci-host-generic driver if we make a minor
>> addition to handle these differences, so we...
>>
>> Add a mapping function for ThunderX PCIe root complexes with a bus
>> shift of 24 and devfn shift of 16.  Ignore accesses for devices other
>> than the first device on the primary bus.
>>
>> Document the whole thing in devicetree/bindings/pci/host-generic-pci.txt
>>
>> Signed-off-by: David Daney <david.daney@...ium.com>
>> ---
>>   .../devicetree/bindings/pci/host-generic-pci.txt   |  8 +++---
>>   drivers/pci/host/pci-host-generic.c                | 29 ++++++++++++++++++++++
>>   2 files changed, 34 insertions(+), 3 deletions(-)
>
> Thanks, this looks better now:
>
>    Acked-by: Will Deacon <will.deacon@....com>
>

Thanks Will.

Because patches 1/3 and 2/3 will be reworked, I will re-send this as a 
stand-alone patch.

David Daney


> Will
>

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