16e0832faSShawn Lin // SPDX-License-Identifier: GPL-2.0 26e0832faSShawn Lin /* 36e0832faSShawn Lin * Generic PCI host driver common code 46e0832faSShawn Lin * 56e0832faSShawn Lin * Copyright (C) 2014 ARM Limited 66e0832faSShawn Lin * 76e0832faSShawn Lin * Author: Will Deacon <will.deacon@arm.com> 86e0832faSShawn Lin */ 96e0832faSShawn Lin 106e0832faSShawn Lin #include <linux/kernel.h> 110c59c06aSRob Herring #include <linux/module.h> 126e0832faSShawn Lin #include <linux/of_address.h> 13b2f75a41SRob Herring #include <linux/of_device.h> 146e0832faSShawn Lin #include <linux/of_pci.h> 156e0832faSShawn Lin #include <linux/pci-ecam.h> 166e0832faSShawn Lin #include <linux/platform_device.h> 176e0832faSShawn Lin 186e0832faSShawn Lin static void gen_pci_unmap_cfg(void *ptr) 196e0832faSShawn Lin { 206e0832faSShawn Lin pci_ecam_free((struct pci_config_window *)ptr); 216e0832faSShawn Lin } 226e0832faSShawn Lin 236e0832faSShawn Lin static struct pci_config_window *gen_pci_init(struct device *dev, 24*e63434f4SRob Herring struct pci_host_bridge *bridge, const struct pci_ecam_ops *ops) 256e0832faSShawn Lin { 266e0832faSShawn Lin int err; 276e0832faSShawn Lin struct resource cfgres; 286e0832faSShawn Lin struct resource *bus_range = NULL; 296e0832faSShawn Lin struct pci_config_window *cfg; 306e0832faSShawn Lin 316e0832faSShawn Lin /* Parse our PCI ranges and request their resources */ 32*e63434f4SRob Herring err = pci_parse_request_of_pci_ranges(dev, &bridge->windows, NULL, &bus_range); 336e0832faSShawn Lin if (err) 346e0832faSShawn Lin return ERR_PTR(err); 356e0832faSShawn Lin 366e0832faSShawn Lin err = of_address_to_resource(dev->of_node, 0, &cfgres); 376e0832faSShawn Lin if (err) { 386e0832faSShawn Lin dev_err(dev, "missing \"reg\" property\n"); 39*e63434f4SRob Herring return ERR_PTR(err); 406e0832faSShawn Lin } 416e0832faSShawn Lin 426e0832faSShawn Lin cfg = pci_ecam_create(dev, &cfgres, bus_range, ops); 43*e63434f4SRob Herring if (IS_ERR(cfg)) 446e0832faSShawn Lin return cfg; 456e0832faSShawn Lin 46*e63434f4SRob Herring err = devm_add_action_or_reset(dev, gen_pci_unmap_cfg, cfg); 47*e63434f4SRob Herring if (err) 486e0832faSShawn Lin return ERR_PTR(err); 49*e63434f4SRob Herring 50*e63434f4SRob Herring return cfg; 516e0832faSShawn Lin } 526e0832faSShawn Lin 53b2f75a41SRob Herring int pci_host_common_probe(struct platform_device *pdev) 546e0832faSShawn Lin { 556e0832faSShawn Lin struct device *dev = &pdev->dev; 566e0832faSShawn Lin struct pci_host_bridge *bridge; 576e0832faSShawn Lin struct pci_config_window *cfg; 58b2f75a41SRob Herring const struct pci_ecam_ops *ops; 596e0832faSShawn Lin 60b2f75a41SRob Herring ops = of_device_get_match_data(&pdev->dev); 61b2f75a41SRob Herring if (!ops) 62b2f75a41SRob Herring return -ENODEV; 63b2f75a41SRob Herring 646e0832faSShawn Lin bridge = devm_pci_alloc_host_bridge(dev, 0); 656e0832faSShawn Lin if (!bridge) 666e0832faSShawn Lin return -ENOMEM; 676e0832faSShawn Lin 686e0832faSShawn Lin of_pci_check_probe_only(); 696e0832faSShawn Lin 706e0832faSShawn Lin /* Parse and map our Configuration Space windows */ 71*e63434f4SRob Herring cfg = gen_pci_init(dev, bridge, ops); 726e0832faSShawn Lin if (IS_ERR(cfg)) 736e0832faSShawn Lin return PTR_ERR(cfg); 746e0832faSShawn Lin 756e0832faSShawn Lin /* Do not reassign resources if probe only */ 766e0832faSShawn Lin if (!pci_has_flag(PCI_PROBE_ONLY)) 776e0832faSShawn Lin pci_add_flags(PCI_REASSIGN_ALL_BUS); 786e0832faSShawn Lin 796e0832faSShawn Lin bridge->dev.parent = dev; 806e0832faSShawn Lin bridge->sysdata = cfg; 816e0832faSShawn Lin bridge->busnr = cfg->busr.start; 820b104773SRob Herring bridge->ops = (struct pci_ops *)&ops->pci_ops; 836e0832faSShawn Lin bridge->map_irq = of_irq_parse_and_map_pci; 846e0832faSShawn Lin bridge->swizzle_irq = pci_common_swizzle; 856e0832faSShawn Lin 86*e63434f4SRob Herring platform_set_drvdata(pdev, bridge); 876e0832faSShawn Lin 88*e63434f4SRob Herring return pci_host_probe(bridge); 896e0832faSShawn Lin } 900c59c06aSRob Herring EXPORT_SYMBOL_GPL(pci_host_common_probe); 916e0832faSShawn Lin 926e0832faSShawn Lin int pci_host_common_remove(struct platform_device *pdev) 936e0832faSShawn Lin { 94*e63434f4SRob Herring struct pci_host_bridge *bridge = platform_get_drvdata(pdev); 956e0832faSShawn Lin 966e0832faSShawn Lin pci_lock_rescan_remove(); 97*e63434f4SRob Herring pci_stop_root_bus(bridge->bus); 98*e63434f4SRob Herring pci_remove_root_bus(bridge->bus); 996e0832faSShawn Lin pci_unlock_rescan_remove(); 1006e0832faSShawn Lin 1016e0832faSShawn Lin return 0; 1026e0832faSShawn Lin } 1030c59c06aSRob Herring EXPORT_SYMBOL_GPL(pci_host_common_remove); 1040c59c06aSRob Herring 1050c59c06aSRob Herring MODULE_LICENSE("GPL v2"); 106