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
18static void gen_pci_unmap_cfg(void *ptr)
19{
20	pci_ecam_free((struct pci_config_window *)ptr);
21}
22
23static 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
52int 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	bridge->sysdata = cfg;
77	bridge->ops = (struct pci_ops *)&ops->pci_ops;
78	bridge->msi_domain = true;
79
80	return pci_host_probe(bridge);
81}
82EXPORT_SYMBOL_GPL(pci_host_common_probe);
83
84void pci_host_common_remove(struct platform_device *pdev)
85{
86	struct pci_host_bridge *bridge = platform_get_drvdata(pdev);
87
88	pci_lock_rescan_remove();
89	pci_stop_root_bus(bridge->bus);
90	pci_remove_root_bus(bridge->bus);
91	pci_unlock_rescan_remove();
 
 
92}
93EXPORT_SYMBOL_GPL(pci_host_common_remove);
94
95MODULE_DESCRIPTION("Generic PCI host common driver");
96MODULE_LICENSE("GPL v2");

  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_address.h>
 13#include <linux/of_device.h>
 14#include <linux/of_pci.h>
 15#include <linux/pci-ecam.h>
 16#include <linux/platform_device.h>
 17
 18static void gen_pci_unmap_cfg(void *ptr)
 19{
 20	pci_ecam_free((struct pci_config_window *)ptr);
 21}
 22
 23static 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
 52int 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}
 86EXPORT_SYMBOL_GPL(pci_host_common_probe);
 87
 88int 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}
 99EXPORT_SYMBOL_GPL(pci_host_common_remove);
100
 
101MODULE_LICENSE("GPL v2");