| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Simple, generic PCI host controller driver targeting firmware-initialised |
| * systems and virtual machines (e.g. the PCI emulation provided by kvmtool). |
| * |
| * Copyright (C) 2014 ARM Limited |
| * |
| * Author: Will Deacon <will.deacon@arm.com> |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/init.h> |
| #include <linux/module.h> |
| #include <linux/pci-ecam.h> |
| #include <linux/platform_device.h> |
| |
| static const struct pci_ecam_ops gen_pci_cfg_cam_bus_ops = { |
| .bus_shift = 16, |
| .pci_ops = { |
| .map_bus = pci_ecam_map_bus, |
| .read = pci_generic_config_read, |
| .write = pci_generic_config_write, |
| } |
| }; |
| |
| 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 const 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 }, |
| |
| { .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 }, |
| |
| { }, |
| }; |
| MODULE_DEVICE_TABLE(of, gen_pci_of_match); |
| |
| static struct platform_driver gen_pci_driver = { |
| .driver = { |
| .name = "pci-host-generic", |
| .of_match_table = gen_pci_of_match, |
| }, |
| .probe = pci_host_common_probe, |
| .remove = pci_host_common_remove, |
| }; |
| module_platform_driver(gen_pci_driver); |
| |
| MODULE_LICENSE("GPL v2"); |