1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Common library for PCI host controller drivers
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
18 #include "pci-host-common.h"
19
gen_pci_unmap_cfg(void * ptr)20 static void gen_pci_unmap_cfg(void *ptr)
21 {
22 pci_ecam_free((struct pci_config_window *)ptr);
23 }
24
gen_pci_init(struct device * dev,struct pci_host_bridge * bridge,const struct pci_ecam_ops * ops)25 static struct pci_config_window *gen_pci_init(struct device *dev,
26 struct pci_host_bridge *bridge, const struct pci_ecam_ops *ops)
27 {
28 int err;
29 struct resource cfgres;
30 struct resource_entry *bus;
31 struct pci_config_window *cfg;
32
33 err = of_address_to_resource(dev->of_node, 0, &cfgres);
34 if (err) {
35 dev_err(dev, "missing \"reg\" property\n");
36 return ERR_PTR(err);
37 }
38
39 bus = resource_list_first_type(&bridge->windows, IORESOURCE_BUS);
40 if (!bus)
41 return ERR_PTR(-ENODEV);
42
43 cfg = pci_ecam_create(dev, &cfgres, bus->res, ops);
44 if (IS_ERR(cfg))
45 return cfg;
46
47 err = devm_add_action_or_reset(dev, gen_pci_unmap_cfg, cfg);
48 if (err)
49 return ERR_PTR(err);
50
51 return cfg;
52 }
53
pci_host_common_init(struct platform_device * pdev,const struct pci_ecam_ops * ops)54 int pci_host_common_init(struct platform_device *pdev,
55 const struct pci_ecam_ops *ops)
56 {
57 struct device *dev = &pdev->dev;
58 struct pci_host_bridge *bridge;
59 struct pci_config_window *cfg;
60
61 bridge = devm_pci_alloc_host_bridge(dev, 0);
62 if (!bridge)
63 return -ENOMEM;
64
65 of_pci_check_probe_only();
66
67 /* Parse and map our Configuration Space windows */
68 cfg = gen_pci_init(dev, bridge, ops);
69 if (IS_ERR(cfg))
70 return PTR_ERR(cfg);
71
72 platform_set_drvdata(pdev, bridge);
73
74 bridge->sysdata = cfg;
75 bridge->ops = (struct pci_ops *)&ops->pci_ops;
76 bridge->enable_device = ops->enable_device;
77 bridge->disable_device = ops->disable_device;
78 bridge->msi_domain = true;
79
80 return pci_host_probe(bridge);
81 }
82 EXPORT_SYMBOL_GPL(pci_host_common_init);
83
pci_host_common_probe(struct platform_device * pdev)84 int pci_host_common_probe(struct platform_device *pdev)
85 {
86 const struct pci_ecam_ops *ops;
87
88 ops = of_device_get_match_data(&pdev->dev);
89 if (!ops)
90 return -ENODEV;
91
92 return pci_host_common_init(pdev, ops);
93 }
94 EXPORT_SYMBOL_GPL(pci_host_common_probe);
95
pci_host_common_remove(struct platform_device * pdev)96 void pci_host_common_remove(struct platform_device *pdev)
97 {
98 struct pci_host_bridge *bridge = platform_get_drvdata(pdev);
99
100 pci_lock_rescan_remove();
101 pci_stop_root_bus(bridge->bus);
102 pci_remove_root_bus(bridge->bus);
103 pci_unlock_rescan_remove();
104 }
105 EXPORT_SYMBOL_GPL(pci_host_common_remove);
106
107 MODULE_DESCRIPTION("Common library for PCI host controller drivers");
108 MODULE_LICENSE("GPL v2");
109