From: David Daney <david.daney@xxxxxxxxxx> 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@xxxxxxxxxx> --- This patch depends on the set I recently sent: https://lkml.org/lkml/2015/9/11/764 .../devicetree/bindings/pci/host-generic-pci.txt | 5 +++- drivers/pci/host/pci-host-generic.c | 29 ++++++++++++++++++++++ 2 files changed, 33 insertions(+), 1 deletion(-) diff --git a/Documentation/devicetree/bindings/pci/host-generic-pci.txt b/Documentation/devicetree/bindings/pci/host-generic-pci.txt index daa6942..51cc1d1 100644 --- a/Documentation/devicetree/bindings/pci/host-generic-pci.txt +++ b/Documentation/devicetree/bindings/pci/host-generic-pci.txt @@ -16,7 +16,10 @@ Properties of the host controller node: - compatible : Must be "pci-host-cam-generic" or "pci-host-ecam-generic" depending on the layout of configuration space (CAM vs - ECAM respectively). + ECAM respectively). Also supported is + "cavium,pci-host-thunder-pem" which has bus:devfn:reg in + bits 24:16:0 respectively of the PCI config space address + window. - device_type : Must be "pci". diff --git a/drivers/pci/host/pci-host-generic.c b/drivers/pci/host/pci-host-generic.c index e0248b4..a392ba2 100644 --- a/drivers/pci/host/pci-host-generic.c +++ b/drivers/pci/host/pci-host-generic.c @@ -91,6 +91,32 @@ static struct gen_pci_cfg_bus_ops gen_pci_cfg_ecam_bus_ops = { } }; +static void __iomem *gen_pci_map_cfg_bus_thunder_pem(struct pci_bus *bus, + unsigned int devfn, + int where) +{ + struct gen_pci *pci = bus->sysdata; + resource_size_t idx = bus->number - pci->cfg.bus_range->start; + + /* + * Thunder PEM is a PCIe RC, but without a root bridge. On + * the primary bus, ignore accesses for devices other than + * the first device. + */ + if (idx == 0 && (devfn & ~7u)) + return NULL; + return pci->cfg.win[idx] + ((devfn << 16) | where); +} + +static struct gen_pci_cfg_bus_ops gen_pci_cfg_thunder_pem_bus_ops = { + .bus_shift = 24, + .ops = { + .map_bus = gen_pci_map_cfg_bus_thunder_pem, + .read = pci_generic_config_read, + .write = pci_generic_config_write, + } +}; + static const struct of_device_id gen_pci_of_match[] = { { .compatible = "pci-host-cam-generic", .data = &gen_pci_cfg_cam_bus_ops }, @@ -98,6 +124,9 @@ static const struct of_device_id gen_pci_of_match[] = { { .compatible = "pci-host-ecam-generic", .data = &gen_pci_cfg_ecam_bus_ops }, + { .compatible = "cavium,pci-host-thunder-pem", + .data = &gen_pci_cfg_thunder_pem_bus_ops }, + { }, }; MODULE_DEVICE_TABLE(of, gen_pci_of_match); -- 1.7.11.7 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
