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

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Simple, generic PCI host controller driver targeting firmware-initialised
  4 * systems and virtual machines (e.g. the PCI emulation provided by kvmtool).
  5 *
  6 * Copyright (C) 2014 ARM Limited
  7 *
  8 * Author: Will Deacon <will.deacon@arm.com>
  9 */
 10
 11#include <linux/kernel.h>
 12#include <linux/init.h>
 13#include <linux/of_address.h>
 14#include <linux/of_pci.h>
 15#include <linux/pci-ecam.h>
 16#include <linux/platform_device.h>
 17
 18static struct pci_ecam_ops gen_pci_cfg_cam_bus_ops = {
 19	.bus_shift	= 16,
 20	.pci_ops	= {
 21		.map_bus	= pci_ecam_map_bus,
 22		.read		= pci_generic_config_read,
 23		.write		= pci_generic_config_write,
 24	}
 25};
 26
 27static bool pci_dw_valid_device(struct pci_bus *bus, unsigned int devfn)
 28{
 29	struct pci_config_window *cfg = bus->sysdata;
 30
 31	/*
 32	 * The Synopsys DesignWare PCIe controller in ECAM mode will not filter
 33	 * type 0 config TLPs sent to devices 1 and up on its downstream port,
 34	 * resulting in devices appearing multiple times on bus 0 unless we
 35	 * filter out those accesses here.
 36	 */
 37	if (bus->number == cfg->busr.start && PCI_SLOT(devfn) > 0)
 38		return false;
 39
 40	return true;
 41}
 42
 43static void __iomem *pci_dw_ecam_map_bus(struct pci_bus *bus,
 44					 unsigned int devfn, int where)
 45{
 46	if (!pci_dw_valid_device(bus, devfn))
 47		return NULL;
 48
 49	return pci_ecam_map_bus(bus, devfn, where);
 50}
 51
 52static struct pci_ecam_ops pci_dw_ecam_bus_ops = {
 53	.bus_shift	= 20,
 54	.pci_ops	= {
 55		.map_bus	= pci_dw_ecam_map_bus,
 56		.read		= pci_generic_config_read,
 57		.write		= pci_generic_config_write,
 58	}
 59};
 60
 61static const struct of_device_id gen_pci_of_match[] = {
 62	{ .compatible = "pci-host-cam-generic",
 63	  .data = &gen_pci_cfg_cam_bus_ops },
 64
 65	{ .compatible = "pci-host-ecam-generic",
 66	  .data = &pci_generic_ecam_ops },
 67
 68	{ .compatible = "marvell,armada8k-pcie-ecam",
 69	  .data = &pci_dw_ecam_bus_ops },
 70
 71	{ .compatible = "socionext,synquacer-pcie-ecam",
 72	  .data = &pci_dw_ecam_bus_ops },
 73
 74	{ .compatible = "snps,dw-pcie-ecam",
 75	  .data = &pci_dw_ecam_bus_ops },
 76
 77	{ },
 78};
 79
 80static int gen_pci_probe(struct platform_device *pdev)
 81{
 82	const struct of_device_id *of_id;
 83	struct pci_ecam_ops *ops;
 84
 85	of_id = of_match_node(gen_pci_of_match, pdev->dev.of_node);
 86	ops = (struct pci_ecam_ops *)of_id->data;
 87
 88	return pci_host_common_probe(pdev, ops);
 89}
 90
 91static struct platform_driver gen_pci_driver = {
 92	.driver = {
 93		.name = "pci-host-generic",
 94		.of_match_table = gen_pci_of_match,
 95		.suppress_bind_attrs = true,
 96	},
 97	.probe = gen_pci_probe,
 98	.remove = pci_host_common_remove,
 99};
100builtin_platform_driver(gen_pci_driver);