1 // SPDX-License-Identifier: GPL-2.0
3 * Generic PCI host driver common code
5 * Copyright (C) 2014 ARM Limited
7 * Author: Will Deacon <will.deacon@arm.com>
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/of_address.h>
13 #include <linux/of_pci.h>
14 #include <linux/pci-ecam.h>
15 #include <linux/platform_device.h>
17 static void gen_pci_unmap_cfg(void *ptr)
19 pci_ecam_free((struct pci_config_window *)ptr);
22 static struct pci_config_window *gen_pci_init(struct device *dev,
23 struct list_head *resources, const struct pci_ecam_ops *ops)
26 struct resource cfgres;
27 struct resource *bus_range = NULL;
28 struct pci_config_window *cfg;
30 /* Parse our PCI ranges and request their resources */
31 err = pci_parse_request_of_pci_ranges(dev, resources, NULL, &bus_range);
35 err = of_address_to_resource(dev->of_node, 0, &cfgres);
37 dev_err(dev, "missing \"reg\" property\n");
41 cfg = pci_ecam_create(dev, &cfgres, bus_range, ops);
47 err = devm_add_action_or_reset(dev, gen_pci_unmap_cfg, cfg);
54 pci_free_resource_list(resources);
58 int pci_host_common_probe(struct platform_device *pdev,
59 const struct pci_ecam_ops *ops)
61 struct device *dev = &pdev->dev;
62 struct pci_host_bridge *bridge;
63 struct pci_config_window *cfg;
64 struct list_head resources;
67 bridge = devm_pci_alloc_host_bridge(dev, 0);
71 of_pci_check_probe_only();
73 /* Parse and map our Configuration Space windows */
74 cfg = gen_pci_init(dev, &resources, ops);
78 /* Do not reassign resources if probe only */
79 if (!pci_has_flag(PCI_PROBE_ONLY))
80 pci_add_flags(PCI_REASSIGN_ALL_BUS);
82 list_splice_init(&resources, &bridge->windows);
83 bridge->dev.parent = dev;
84 bridge->sysdata = cfg;
85 bridge->busnr = cfg->busr.start;
86 bridge->ops = (struct pci_ops *)&ops->pci_ops;
87 bridge->map_irq = of_irq_parse_and_map_pci;
88 bridge->swizzle_irq = pci_common_swizzle;
90 ret = pci_host_probe(bridge);
92 pci_free_resource_list(&resources);
96 platform_set_drvdata(pdev, bridge->bus);
99 EXPORT_SYMBOL_GPL(pci_host_common_probe);
101 int pci_host_common_remove(struct platform_device *pdev)
103 struct pci_bus *bus = platform_get_drvdata(pdev);
105 pci_lock_rescan_remove();
106 pci_stop_root_bus(bus);
107 pci_remove_root_bus(bus);
108 pci_unlock_rescan_remove();
112 EXPORT_SYMBOL_GPL(pci_host_common_remove);
114 MODULE_LICENSE("GPL v2");