1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Generic PCI host driver common code
4 *
5 * Copyright (C) 2014 ARM Limited
6 *
7 * Author: Will Deacon <will.deacon@arm.com>
8 */
9
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/of.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
gen_pci_unmap_cfg(void * ptr)18 static void gen_pci_unmap_cfg(void *ptr)
19 {
20 pci_ecam_free((struct pci_config_window *)ptr);
21 }
22
gen_pci_init(struct device * dev,struct pci_host_bridge * bridge,const struct pci_ecam_ops * ops)23 static struct pci_config_window *gen_pci_init(struct device *dev,
24 struct pci_host_bridge *bridge, const struct pci_ecam_ops *ops)
25 {
26 int err;
27 struct resource cfgres;
28 struct resource_entry *bus;
29 struct pci_config_window *cfg;
30
31 err = of_address_to_resource(dev->of_node, 0, &cfgres);
32 if (err) {
33 dev_err(dev, "missing \"reg\" property\n");
34 return ERR_PTR(err);
35 }
36
37 bus = resource_list_first_type(&bridge->windows, IORESOURCE_BUS);
38 if (!bus)
39 return ERR_PTR(-ENODEV);
40
41 cfg = pci_ecam_create(dev, &cfgres, bus->res, ops);
42 if (IS_ERR(cfg))
43 return cfg;
44
45 err = devm_add_action_or_reset(dev, gen_pci_unmap_cfg, cfg);
46 if (err)
47 return ERR_PTR(err);
48
49 return cfg;
50 }
51
pci_host_common_probe(struct platform_device * pdev)52 int pci_host_common_probe(struct platform_device *pdev)
53 {
54 struct device *dev = &pdev->dev;
55 struct pci_host_bridge *bridge;
56 struct pci_config_window *cfg;
57 const struct pci_ecam_ops *ops;
58
59 ops = of_device_get_match_data(&pdev->dev);
60 if (!ops)
61 return -ENODEV;
62
63 bridge = devm_pci_alloc_host_bridge(dev, 0);
64 if (!bridge)
65 return -ENOMEM;
66
67 platform_set_drvdata(pdev, bridge);
68
69 of_pci_check_probe_only();
70
71 /* Parse and map our Configuration Space windows */
72 cfg = gen_pci_init(dev, bridge, ops);
73 if (IS_ERR(cfg))
74 return PTR_ERR(cfg);
75
76 /* Do not reassign resources if probe only */
77 if (!pci_has_flag(PCI_PROBE_ONLY))
78 pci_add_flags(PCI_REASSIGN_ALL_BUS);
79
80 bridge->sysdata = cfg;
81 bridge->ops = (struct pci_ops *)&ops->pci_ops;
82 bridge->msi_domain = true;
83
84 return pci_host_probe(bridge);
85 }
86 EXPORT_SYMBOL_GPL(pci_host_common_probe);
87
pci_host_common_remove(struct platform_device * pdev)88 int pci_host_common_remove(struct platform_device *pdev)
89 {
90 struct pci_host_bridge *bridge = platform_get_drvdata(pdev);
91
92 pci_lock_rescan_remove();
93 pci_stop_root_bus(bridge->bus);
94 pci_remove_root_bus(bridge->bus);
95 pci_unlock_rescan_remove();
96
97 return 0;
98 }
99 EXPORT_SYMBOL_GPL(pci_host_common_remove);
100
101 MODULE_LICENSE("GPL v2");
102