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

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Message-ID: <20150922185230.GR7356@arm.com>
Date:	Tue, 22 Sep 2015 19:52:30 +0100
From:	Will Deacon <will.deacon@....com>
To:	David Daney <ddaney.cavm@...il.com>
Cc:	"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 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>

Will
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