// SPDX-License-Identifier: GPL-2.0 /* * Generic PCI host driver common code * * Copyright (C) 2014 ARM Limited * * Author: Will Deacon <will.deacon@arm.com> */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/of.h> #include <linux/of_address.h> #include <linux/of_pci.h> #include <linux/pci-ecam.h> #include <linux/platform_device.h> static void gen_pci_unmap_cfg(void *ptr) { pci_ecam_free((struct pci_config_window *)ptr); } static struct pci_config_window *gen_pci_init(struct device *dev, struct pci_host_bridge *bridge, const struct pci_ecam_ops *ops) { int err; struct resource cfgres; struct resource_entry *bus; struct pci_config_window *cfg; err = of_address_to_resource(dev->of_node, 0, &cfgres); if (err) { dev_err(dev, "missing \"reg\" property\n"); return ERR_PTR(err); } bus = resource_list_first_type(&bridge->windows, IORESOURCE_BUS); if (!bus) return ERR_PTR(-ENODEV); cfg = pci_ecam_create(dev, &cfgres, bus->res, ops); if (IS_ERR(cfg)) return cfg; err = devm_add_action_or_reset(dev, gen_pci_unmap_cfg, cfg); if (err) return ERR_PTR(err); return cfg; } int pci_host_common_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct pci_host_bridge *bridge; struct pci_config_window *cfg; const struct pci_ecam_ops *ops; ops = of_device_get_match_data(&pdev->dev); if (!ops) return -ENODEV; bridge = devm_pci_alloc_host_bridge(dev, 0); if (!bridge) return -ENOMEM; platform_set_drvdata(pdev, bridge); of_pci_check_probe_only(); /* Parse and map our Configuration Space windows */ cfg = gen_pci_init(dev, bridge, ops); if (IS_ERR(cfg)) return PTR_ERR(cfg); bridge->sysdata = cfg; bridge->ops = (struct pci_ops *)&ops->pci_ops; bridge->msi_domain = true; return pci_host_probe(bridge); } EXPORT_SYMBOL_GPL(pci_host_common_probe); void pci_host_common_remove(struct platform_device *pdev) { struct pci_host_bridge *bridge = platform_get_drvdata(pdev); pci_lock_rescan_remove(); pci_stop_root_bus(bridge->bus); pci_remove_root_bus(bridge->bus); pci_unlock_rescan_remove(); } EXPORT_SYMBOL_GPL(pci_host_common_remove); MODULE_DESCRIPTION("Generic PCI host common driver"); MODULE_LICENSE("GPL v2");