1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Generic PCI host driver common code 4 * 5 * Copyright (C) 2014 ARM Limited 6 * 7 * Author: Will Deacon <will.deacon@arm.com> 8 */ 9 10 #include <linux/kernel.h> 11 #include <linux/module.h> 12 #include <linux/of_address.h> 13 #include <linux/of_device.h> 14 #include <linux/of_pci.h> 15 #include <linux/pci-ecam.h> 16 #include <linux/platform_device.h> 17 gen_pci_unmap_cfg(void * ptr)18 static void gen_pci_unmap_cfg(void *ptr) 19 { 20 pci_ecam_free((struct pci_config_window *)ptr); 21 } 22 gen_pci_init(struct device * dev,struct pci_host_bridge * bridge,const struct pci_ecam_ops * ops)23 static 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 pci_host_common_probe(struct platform_device * pdev)52 int 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 of_pci_check_probe_only(); 68 69 /* Parse and map our Configuration Space windows */ 70 cfg = gen_pci_init(dev, bridge, ops); 71 if (IS_ERR(cfg)) 72 return PTR_ERR(cfg); 73 74 /* Do not reassign resources if probe only */ 75 if (!pci_has_flag(PCI_PROBE_ONLY)) 76 pci_add_flags(PCI_REASSIGN_ALL_BUS); 77 78 bridge->sysdata = cfg; 79 bridge->ops = (struct pci_ops *)&ops->pci_ops; 80 81 platform_set_drvdata(pdev, bridge); 82 83 return pci_host_probe(bridge); 84 } 85 EXPORT_SYMBOL_GPL(pci_host_common_probe); 86 pci_host_common_remove(struct platform_device * pdev)87 int pci_host_common_remove(struct platform_device *pdev) 88 { 89 struct pci_host_bridge *bridge = platform_get_drvdata(pdev); 90 91 pci_lock_rescan_remove(); 92 pci_stop_root_bus(bridge->bus); 93 pci_remove_root_bus(bridge->bus); 94 pci_unlock_rescan_remove(); 95 96 return 0; 97 } 98 EXPORT_SYMBOL_GPL(pci_host_common_remove); 99 100 MODULE_LICENSE("GPL v2"); 101