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 | |
18 | static void gen_pci_unmap_cfg(void *ptr) |
19 | { |
20 | pci_ecam_free(cfg: (struct pci_config_window *)ptr); |
21 | } |
22 | |
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: dev->of_node, index: 0, r: &cfgres); |
32 | if (err) { |
33 | dev_err(dev, "missing \"reg\" property\n" ); |
34 | return ERR_PTR(error: err); |
35 | } |
36 | |
37 | bus = resource_list_first_type(list: &bridge->windows, IORESOURCE_BUS); |
38 | if (!bus) |
39 | return ERR_PTR(error: -ENODEV); |
40 | |
41 | cfg = pci_ecam_create(dev, cfgres: &cfgres, busr: bus->res, ops); |
42 | if (IS_ERR(ptr: 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(error: err); |
48 | |
49 | return cfg; |
50 | } |
51 | |
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(dev: &pdev->dev); |
60 | if (!ops) |
61 | return -ENODEV; |
62 | |
63 | bridge = devm_pci_alloc_host_bridge(dev, priv: 0); |
64 | if (!bridge) |
65 | return -ENOMEM; |
66 | |
67 | platform_set_drvdata(pdev, data: 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(ptr: cfg)) |
74 | return PTR_ERR(ptr: cfg); |
75 | |
76 | /* Do not reassign resources if probe only */ |
77 | if (!pci_has_flag(flag: PCI_PROBE_ONLY)) |
78 | pci_add_flags(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 | |
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(bus: bridge->bus); |
94 | pci_remove_root_bus(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 | |