diff options
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/host/pci-host-generic.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/drivers/pci/host/pci-host-generic.c b/drivers/pci/host/pci-host-generic.c index 7d709a7e0aa8..2f05511ce718 100644 --- a/drivers/pci/host/pci-host-generic.c +++ b/drivers/pci/host/pci-host-generic.c @@ -35,6 +35,40 @@ static struct pci_ecam_ops gen_pci_cfg_cam_bus_ops = { } }; +static bool pci_dw_valid_device(struct pci_bus *bus, unsigned int devfn) +{ + struct pci_config_window *cfg = bus->sysdata; + + /* + * The Synopsys DesignWare PCIe controller in ECAM mode will not filter + * type 0 config TLPs sent to devices 1 and up on its downstream port, + * resulting in devices appearing multiple times on bus 0 unless we + * filter out those accesses here. + */ + if (bus->number == cfg->busr.start && PCI_SLOT(devfn) > 0) + return false; + + return true; +} + +static void __iomem *pci_dw_ecam_map_bus(struct pci_bus *bus, + unsigned int devfn, int where) +{ + if (!pci_dw_valid_device(bus, devfn)) + return NULL; + + return pci_ecam_map_bus(bus, devfn, where); +} + +static struct pci_ecam_ops pci_dw_ecam_bus_ops = { + .bus_shift = 20, + .pci_ops = { + .map_bus = pci_dw_ecam_map_bus, + .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 }, @@ -42,6 +76,15 @@ static const struct of_device_id gen_pci_of_match[] = { { .compatible = "pci-host-ecam-generic", .data = &pci_generic_ecam_ops }, + { .compatible = "marvell,armada8k-pcie-ecam", + .data = &pci_dw_ecam_bus_ops }, + + { .compatible = "socionext,synquacer-pcie-ecam", + .data = &pci_dw_ecam_bus_ops }, + + { .compatible = "snps,dw-pcie-ecam", + .data = &pci_dw_ecam_bus_ops }, + { }, }; |