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1// SPDX-License-Identifier: GPL-2.02/*3 * Generic PCI host driver common code4 *5 * Copyright (C) 2014 ARM Limited6 *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");97