From mboxrd@z Thu Jan 1 00:00:00 1970 From: arnd@arndb.de (Arnd Bergmann) Date: Wed, 23 Sep 2015 09:51:30 +0200 Subject: [PATCH v2] PCI: generic: Add support for Cavium ThunderX PCIe root complexes. In-Reply-To: <1442967415-13595-1-git-send-email-ddaney.cavm@gmail.com> References: <1442967415-13595-1-git-send-email-ddaney.cavm@gmail.com> Message-ID: <1524364.fcqUh1gtkt@wuerfel> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Tuesday 22 September 2015 17:16:55 David Daney wrote: > From: David Daney > > 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 > Acked-by: Will Deacon > Acked-by: Arnd Bergmann