1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Generic PCI host driver common code
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2014 ARM Limited
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * Author: Will Deacon <will.deacon@arm.com>
8*4882a593Smuzhiyun */
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #include <linux/kernel.h>
11*4882a593Smuzhiyun #include <linux/module.h>
12*4882a593Smuzhiyun #include <linux/of_address.h>
13*4882a593Smuzhiyun #include <linux/of_device.h>
14*4882a593Smuzhiyun #include <linux/of_pci.h>
15*4882a593Smuzhiyun #include <linux/pci-ecam.h>
16*4882a593Smuzhiyun #include <linux/platform_device.h>
17*4882a593Smuzhiyun
gen_pci_unmap_cfg(void * ptr)18*4882a593Smuzhiyun static void gen_pci_unmap_cfg(void *ptr)
19*4882a593Smuzhiyun {
20*4882a593Smuzhiyun pci_ecam_free((struct pci_config_window *)ptr);
21*4882a593Smuzhiyun }
22*4882a593Smuzhiyun
gen_pci_init(struct device * dev,struct pci_host_bridge * bridge,const struct pci_ecam_ops * ops)23*4882a593Smuzhiyun static struct pci_config_window *gen_pci_init(struct device *dev,
24*4882a593Smuzhiyun struct pci_host_bridge *bridge, const struct pci_ecam_ops *ops)
25*4882a593Smuzhiyun {
26*4882a593Smuzhiyun int err;
27*4882a593Smuzhiyun struct resource cfgres;
28*4882a593Smuzhiyun struct resource_entry *bus;
29*4882a593Smuzhiyun struct pci_config_window *cfg;
30*4882a593Smuzhiyun
31*4882a593Smuzhiyun err = of_address_to_resource(dev->of_node, 0, &cfgres);
32*4882a593Smuzhiyun if (err) {
33*4882a593Smuzhiyun dev_err(dev, "missing \"reg\" property\n");
34*4882a593Smuzhiyun return ERR_PTR(err);
35*4882a593Smuzhiyun }
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun bus = resource_list_first_type(&bridge->windows, IORESOURCE_BUS);
38*4882a593Smuzhiyun if (!bus)
39*4882a593Smuzhiyun return ERR_PTR(-ENODEV);
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun cfg = pci_ecam_create(dev, &cfgres, bus->res, ops);
42*4882a593Smuzhiyun if (IS_ERR(cfg))
43*4882a593Smuzhiyun return cfg;
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun err = devm_add_action_or_reset(dev, gen_pci_unmap_cfg, cfg);
46*4882a593Smuzhiyun if (err)
47*4882a593Smuzhiyun return ERR_PTR(err);
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun return cfg;
50*4882a593Smuzhiyun }
51*4882a593Smuzhiyun
pci_host_common_probe(struct platform_device * pdev)52*4882a593Smuzhiyun int pci_host_common_probe(struct platform_device *pdev)
53*4882a593Smuzhiyun {
54*4882a593Smuzhiyun struct device *dev = &pdev->dev;
55*4882a593Smuzhiyun struct pci_host_bridge *bridge;
56*4882a593Smuzhiyun struct pci_config_window *cfg;
57*4882a593Smuzhiyun const struct pci_ecam_ops *ops;
58*4882a593Smuzhiyun
59*4882a593Smuzhiyun ops = of_device_get_match_data(&pdev->dev);
60*4882a593Smuzhiyun if (!ops)
61*4882a593Smuzhiyun return -ENODEV;
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun bridge = devm_pci_alloc_host_bridge(dev, 0);
64*4882a593Smuzhiyun if (!bridge)
65*4882a593Smuzhiyun return -ENOMEM;
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun of_pci_check_probe_only();
68*4882a593Smuzhiyun
69*4882a593Smuzhiyun /* Parse and map our Configuration Space windows */
70*4882a593Smuzhiyun cfg = gen_pci_init(dev, bridge, ops);
71*4882a593Smuzhiyun if (IS_ERR(cfg))
72*4882a593Smuzhiyun return PTR_ERR(cfg);
73*4882a593Smuzhiyun
74*4882a593Smuzhiyun /* Do not reassign resources if probe only */
75*4882a593Smuzhiyun if (!pci_has_flag(PCI_PROBE_ONLY))
76*4882a593Smuzhiyun pci_add_flags(PCI_REASSIGN_ALL_BUS);
77*4882a593Smuzhiyun
78*4882a593Smuzhiyun bridge->sysdata = cfg;
79*4882a593Smuzhiyun bridge->ops = (struct pci_ops *)&ops->pci_ops;
80*4882a593Smuzhiyun
81*4882a593Smuzhiyun platform_set_drvdata(pdev, bridge);
82*4882a593Smuzhiyun
83*4882a593Smuzhiyun return pci_host_probe(bridge);
84*4882a593Smuzhiyun }
85*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(pci_host_common_probe);
86*4882a593Smuzhiyun
pci_host_common_remove(struct platform_device * pdev)87*4882a593Smuzhiyun int pci_host_common_remove(struct platform_device *pdev)
88*4882a593Smuzhiyun {
89*4882a593Smuzhiyun struct pci_host_bridge *bridge = platform_get_drvdata(pdev);
90*4882a593Smuzhiyun
91*4882a593Smuzhiyun pci_lock_rescan_remove();
92*4882a593Smuzhiyun pci_stop_root_bus(bridge->bus);
93*4882a593Smuzhiyun pci_remove_root_bus(bridge->bus);
94*4882a593Smuzhiyun pci_unlock_rescan_remove();
95*4882a593Smuzhiyun
96*4882a593Smuzhiyun return 0;
97*4882a593Smuzhiyun }
98*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(pci_host_common_remove);
99*4882a593Smuzhiyun
100*4882a593Smuzhiyun MODULE_LICENSE("GPL v2");
101