1 // SPDX-License-Identifier: GPL-2.0
3 * Simple, generic PCI host controller driver targeting firmware-initialised
4 * systems and virtual machines (e.g. the PCI emulation provided by kvmtool).
6 * Copyright (C) 2014 ARM Limited
8 * Author: Will Deacon <will.deacon@arm.com>
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/module.h>
14 #include <linux/of_address.h>
15 #include <linux/of_pci.h>
16 #include <linux/pci-ecam.h>
17 #include <linux/platform_device.h>
19 static const struct pci_ecam_ops gen_pci_cfg_cam_bus_ops = {
22 .map_bus = pci_ecam_map_bus,
23 .read = pci_generic_config_read,
24 .write = pci_generic_config_write,
28 static bool pci_dw_valid_device(struct pci_bus *bus, unsigned int devfn)
30 struct pci_config_window *cfg = bus->sysdata;
33 * The Synopsys DesignWare PCIe controller in ECAM mode will not filter
34 * type 0 config TLPs sent to devices 1 and up on its downstream port,
35 * resulting in devices appearing multiple times on bus 0 unless we
36 * filter out those accesses here.
38 if (bus->number == cfg->busr.start && PCI_SLOT(devfn) > 0)
44 static void __iomem *pci_dw_ecam_map_bus(struct pci_bus *bus,
45 unsigned int devfn, int where)
47 if (!pci_dw_valid_device(bus, devfn))
50 return pci_ecam_map_bus(bus, devfn, where);
53 static const struct pci_ecam_ops pci_dw_ecam_bus_ops = {
56 .map_bus = pci_dw_ecam_map_bus,
57 .read = pci_generic_config_read,
58 .write = pci_generic_config_write,
62 static const struct of_device_id gen_pci_of_match[] = {
63 { .compatible = "pci-host-cam-generic",
64 .data = &gen_pci_cfg_cam_bus_ops },
66 { .compatible = "pci-host-ecam-generic",
67 .data = &pci_generic_ecam_ops },
69 { .compatible = "marvell,armada8k-pcie-ecam",
70 .data = &pci_dw_ecam_bus_ops },
72 { .compatible = "socionext,synquacer-pcie-ecam",
73 .data = &pci_dw_ecam_bus_ops },
75 { .compatible = "snps,dw-pcie-ecam",
76 .data = &pci_dw_ecam_bus_ops },
80 MODULE_DEVICE_TABLE(of, gen_pci_of_match);
82 static int gen_pci_probe(struct platform_device *pdev)
84 const struct of_device_id *of_id;
85 struct pci_ecam_ops *ops;
87 of_id = of_match_node(gen_pci_of_match, pdev->dev.of_node);
88 ops = (struct pci_ecam_ops *)of_id->data;
90 return pci_host_common_probe(pdev, ops);
93 static struct platform_driver gen_pci_driver = {
95 .name = "pci-host-generic",
96 .of_match_table = gen_pci_of_match,
98 .probe = gen_pci_probe,
99 .remove = pci_host_common_remove,
101 module_platform_driver(gen_pci_driver);
103 MODULE_LICENSE("GPL v2");