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, 24e63434f4SRob Herring struct pci_host_bridge *bridge, const struct pci_ecam_ops *ops) 256e0832faSShawn Lin { 266e0832faSShawn Lin int err; 276e0832faSShawn Lin struct resource cfgres; 28669cbc70SRob Herring struct resource_entry *bus; 296e0832faSShawn Lin struct pci_config_window *cfg; 306e0832faSShawn Lin 316e0832faSShawn Lin err = of_address_to_resource(dev->of_node, 0, &cfgres); 326e0832faSShawn Lin if (err) { 336e0832faSShawn Lin dev_err(dev, "missing \"reg\" property\n"); 34e63434f4SRob Herring return ERR_PTR(err); 356e0832faSShawn Lin } 366e0832faSShawn Lin 37669cbc70SRob Herring bus = resource_list_first_type(&bridge->windows, IORESOURCE_BUS); 38669cbc70SRob Herring if (!bus) 39669cbc70SRob Herring return ERR_PTR(-ENODEV); 40669cbc70SRob Herring 41669cbc70SRob Herring cfg = pci_ecam_create(dev, &cfgres, bus->res, ops); 42e63434f4SRob Herring if (IS_ERR(cfg)) 436e0832faSShawn Lin return cfg; 446e0832faSShawn Lin 45e63434f4SRob Herring err = devm_add_action_or_reset(dev, gen_pci_unmap_cfg, cfg); 46e63434f4SRob Herring if (err) 476e0832faSShawn Lin return ERR_PTR(err); 48e63434f4SRob Herring 49e63434f4SRob Herring return cfg; 506e0832faSShawn Lin } 516e0832faSShawn Lin 52b2f75a41SRob Herring int pci_host_common_probe(struct platform_device *pdev) 536e0832faSShawn Lin { 546e0832faSShawn Lin struct device *dev = &pdev->dev; 556e0832faSShawn Lin struct pci_host_bridge *bridge; 566e0832faSShawn Lin struct pci_config_window *cfg; 57b2f75a41SRob Herring const struct pci_ecam_ops *ops; 586e0832faSShawn Lin 59b2f75a41SRob Herring ops = of_device_get_match_data(&pdev->dev); 60b2f75a41SRob Herring if (!ops) 61b2f75a41SRob Herring return -ENODEV; 62b2f75a41SRob Herring 636e0832faSShawn Lin bridge = devm_pci_alloc_host_bridge(dev, 0); 646e0832faSShawn Lin if (!bridge) 656e0832faSShawn Lin return -ENOMEM; 666e0832faSShawn Lin 67*791c9f14SDaire McNamara platform_set_drvdata(pdev, bridge); 68*791c9f14SDaire McNamara 696e0832faSShawn Lin of_pci_check_probe_only(); 706e0832faSShawn Lin 716e0832faSShawn Lin /* Parse and map our Configuration Space windows */ 72e63434f4SRob Herring cfg = gen_pci_init(dev, bridge, ops); 736e0832faSShawn Lin if (IS_ERR(cfg)) 746e0832faSShawn Lin return PTR_ERR(cfg); 756e0832faSShawn Lin 766e0832faSShawn Lin /* Do not reassign resources if probe only */ 776e0832faSShawn Lin if (!pci_has_flag(PCI_PROBE_ONLY)) 786e0832faSShawn Lin pci_add_flags(PCI_REASSIGN_ALL_BUS); 796e0832faSShawn Lin 806e0832faSShawn Lin bridge->sysdata = cfg; 810b104773SRob Herring bridge->ops = (struct pci_ops *)&ops->pci_ops; 826e0832faSShawn Lin 83e63434f4SRob Herring return pci_host_probe(bridge); 846e0832faSShawn Lin } 850c59c06aSRob Herring EXPORT_SYMBOL_GPL(pci_host_common_probe); 866e0832faSShawn Lin 876e0832faSShawn Lin int pci_host_common_remove(struct platform_device *pdev) 886e0832faSShawn Lin { 89e63434f4SRob Herring struct pci_host_bridge *bridge = platform_get_drvdata(pdev); 906e0832faSShawn Lin 916e0832faSShawn Lin pci_lock_rescan_remove(); 92e63434f4SRob Herring pci_stop_root_bus(bridge->bus); 93e63434f4SRob Herring pci_remove_root_bus(bridge->bus); 946e0832faSShawn Lin pci_unlock_rescan_remove(); 956e0832faSShawn Lin 966e0832faSShawn Lin return 0; 976e0832faSShawn Lin } 980c59c06aSRob Herring EXPORT_SYMBOL_GPL(pci_host_common_remove); 990c59c06aSRob Herring 1000c59c06aSRob Herring MODULE_LICENSE("GPL v2"); 101