tjh.dev
Linux kernel mirror (for testing)
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linux
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
20static void gen_pci_unmap_cfg(void *ptr)
21{
22 pci_ecam_free((struct pci_config_window *)ptr);
23}
24
25static 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
54int 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 platform_set_drvdata(pdev, bridge);
68
69 /* Parse and map our Configuration Space windows */
70 cfg = gen_pci_init(dev, bridge, ops);
71 if (IS_ERR(cfg))
72 return PTR_ERR(cfg);
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}
82EXPORT_SYMBOL_GPL(pci_host_common_init);
83
84int 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}
94EXPORT_SYMBOL_GPL(pci_host_common_probe);
95
96void 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}
105EXPORT_SYMBOL_GPL(pci_host_common_remove);
106
107MODULE_DESCRIPTION("Common library for PCI host controller drivers");
108MODULE_LICENSE("GPL v2");