UEFI based systems incorporating a Synopsys Designware PCIe controller in RC mode will typically configure it before entering the OS. If this configuration is fully static and ECAM compliant, there is no need to expose particulars of the device to the OS, and we can simply describe it as "pci-host-ecam-generic". However, the Synopsys IP may be synthesized in a way where a quirk is needed for config space accesses to the first bus. It makes little sense to instantiate yet another pcie-designware driver that contains all the low level setup code, but it is also not justified to add quirks handling to the generic ECAM driver. So instead, create a variant of the generic ECAM driver that filters config space accesses directed at device #1 and up on the first bus. Also, add a binding and driver to support the MSI functionality available in some versions of this IP. This allows the MSI routing to be described at the DT level rather than hardcoding it in the driver. Cc: Leif Lindholm <leif.lindholm@xxxxxxxxxx> Cc: Graeme Gregory <graeme.gregory@xxxxxxxxxx> Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx> Cc: Jingoo Han <jingoohan1@xxxxxxxxx> Cc: Joao Pinto <Joao.Pinto@xxxxxxxxxxxx> Cc: Marc Zyngier <marc.zyngier@xxxxxxx> Ard Biesheuvel (3): pci: designware: add driver for DWC controller in ECAM shift mode pci: designware: add separate driver for the MSI part of the RC dt-bindings: designware: add binding for Designware PCIe in ECAM mode Documentation/devicetree/bindings/pci/designware-pcie-ecam.txt | 56 +++++ drivers/pci/dwc/Kconfig | 11 + drivers/pci/dwc/Makefile | 4 +- drivers/pci/dwc/pcie-designware-ecam.c | 75 ++++++ drivers/pci/dwc/pcie-designware-msi.c | 255 ++++++++++++++++++++ 5 files changed, 400 insertions(+), 1 deletion(-) create mode 100644 Documentation/devicetree/bindings/pci/designware-pcie-ecam.txt create mode 100644 drivers/pci/dwc/pcie-designware-ecam.c create mode 100644 drivers/pci/dwc/pcie-designware-msi.c -- 2.11.0
