1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Simple, generic PCI host controller driver targeting firmware-initialised
4*4882a593Smuzhiyun * systems and virtual machines (e.g. the PCI emulation provided by kvmtool).
5*4882a593Smuzhiyun *
6*4882a593Smuzhiyun * Copyright (C) 2014 ARM Limited
7*4882a593Smuzhiyun *
8*4882a593Smuzhiyun * Author: Will Deacon <will.deacon@arm.com>
9*4882a593Smuzhiyun */
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun #include <linux/kernel.h>
12*4882a593Smuzhiyun #include <linux/init.h>
13*4882a593Smuzhiyun #include <linux/module.h>
14*4882a593Smuzhiyun #include <linux/pci-ecam.h>
15*4882a593Smuzhiyun #include <linux/platform_device.h>
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun static const struct pci_ecam_ops gen_pci_cfg_cam_bus_ops = {
18*4882a593Smuzhiyun .bus_shift = 16,
19*4882a593Smuzhiyun .pci_ops = {
20*4882a593Smuzhiyun .map_bus = pci_ecam_map_bus,
21*4882a593Smuzhiyun .read = pci_generic_config_read,
22*4882a593Smuzhiyun .write = pci_generic_config_write,
23*4882a593Smuzhiyun }
24*4882a593Smuzhiyun };
25*4882a593Smuzhiyun
pci_dw_valid_device(struct pci_bus * bus,unsigned int devfn)26*4882a593Smuzhiyun static bool pci_dw_valid_device(struct pci_bus *bus, unsigned int devfn)
27*4882a593Smuzhiyun {
28*4882a593Smuzhiyun struct pci_config_window *cfg = bus->sysdata;
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun /*
31*4882a593Smuzhiyun * The Synopsys DesignWare PCIe controller in ECAM mode will not filter
32*4882a593Smuzhiyun * type 0 config TLPs sent to devices 1 and up on its downstream port,
33*4882a593Smuzhiyun * resulting in devices appearing multiple times on bus 0 unless we
34*4882a593Smuzhiyun * filter out those accesses here.
35*4882a593Smuzhiyun */
36*4882a593Smuzhiyun if (bus->number == cfg->busr.start && PCI_SLOT(devfn) > 0)
37*4882a593Smuzhiyun return false;
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun return true;
40*4882a593Smuzhiyun }
41*4882a593Smuzhiyun
pci_dw_ecam_map_bus(struct pci_bus * bus,unsigned int devfn,int where)42*4882a593Smuzhiyun static void __iomem *pci_dw_ecam_map_bus(struct pci_bus *bus,
43*4882a593Smuzhiyun unsigned int devfn, int where)
44*4882a593Smuzhiyun {
45*4882a593Smuzhiyun if (!pci_dw_valid_device(bus, devfn))
46*4882a593Smuzhiyun return NULL;
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun return pci_ecam_map_bus(bus, devfn, where);
49*4882a593Smuzhiyun }
50*4882a593Smuzhiyun
51*4882a593Smuzhiyun static const struct pci_ecam_ops pci_dw_ecam_bus_ops = {
52*4882a593Smuzhiyun .bus_shift = 20,
53*4882a593Smuzhiyun .pci_ops = {
54*4882a593Smuzhiyun .map_bus = pci_dw_ecam_map_bus,
55*4882a593Smuzhiyun .read = pci_generic_config_read,
56*4882a593Smuzhiyun .write = pci_generic_config_write,
57*4882a593Smuzhiyun }
58*4882a593Smuzhiyun };
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun static const struct of_device_id gen_pci_of_match[] = {
61*4882a593Smuzhiyun { .compatible = "pci-host-cam-generic",
62*4882a593Smuzhiyun .data = &gen_pci_cfg_cam_bus_ops },
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun { .compatible = "pci-host-ecam-generic",
65*4882a593Smuzhiyun .data = &pci_generic_ecam_ops },
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun { .compatible = "marvell,armada8k-pcie-ecam",
68*4882a593Smuzhiyun .data = &pci_dw_ecam_bus_ops },
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun { .compatible = "socionext,synquacer-pcie-ecam",
71*4882a593Smuzhiyun .data = &pci_dw_ecam_bus_ops },
72*4882a593Smuzhiyun
73*4882a593Smuzhiyun { .compatible = "snps,dw-pcie-ecam",
74*4882a593Smuzhiyun .data = &pci_dw_ecam_bus_ops },
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun { },
77*4882a593Smuzhiyun };
78*4882a593Smuzhiyun MODULE_DEVICE_TABLE(of, gen_pci_of_match);
79*4882a593Smuzhiyun
80*4882a593Smuzhiyun static struct platform_driver gen_pci_driver = {
81*4882a593Smuzhiyun .driver = {
82*4882a593Smuzhiyun .name = "pci-host-generic",
83*4882a593Smuzhiyun .of_match_table = gen_pci_of_match,
84*4882a593Smuzhiyun },
85*4882a593Smuzhiyun .probe = pci_host_common_probe,
86*4882a593Smuzhiyun .remove = pci_host_common_remove,
87*4882a593Smuzhiyun };
88*4882a593Smuzhiyun module_platform_driver(gen_pci_driver);
89*4882a593Smuzhiyun
90*4882a593Smuzhiyun MODULE_LICENSE("GPL v2");
91