| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 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/of_address.h> |
| 12 | #include <linux/of_pci.h> |
| 13 | #include <linux/pci-ecam.h> |
| 14 | #include <linux/platform_device.h> |
| 15 | |
| 16 | static void gen_pci_unmap_cfg(void *ptr) |
| 17 | { |
| 18 | pci_ecam_free((struct pci_config_window *)ptr); |
| 19 | } |
| 20 | |
| 21 | static struct pci_config_window *gen_pci_init(struct device *dev, |
| 22 | struct list_head *resources, struct pci_ecam_ops *ops) |
| 23 | { |
| 24 | int err; |
| 25 | struct resource cfgres; |
| 26 | struct resource *bus_range = NULL; |
| 27 | struct pci_config_window *cfg; |
| 28 | |
| 29 | /* Parse our PCI ranges and request their resources */ |
| 30 | err = pci_parse_request_of_pci_ranges(dev, resources, &bus_range); |
| 31 | if (err) |
| 32 | return ERR_PTR(err); |
| 33 | |
| 34 | err = of_address_to_resource(dev->of_node, 0, &cfgres); |
| 35 | if (err) { |
| 36 | dev_err(dev, "missing \"reg\" property\n"); |
| 37 | goto err_out; |
| 38 | } |
| 39 | |
| 40 | cfg = pci_ecam_create(dev, &cfgres, bus_range, ops); |
| 41 | if (IS_ERR(cfg)) { |
| 42 | err = PTR_ERR(cfg); |
| 43 | goto err_out; |
| 44 | } |
| 45 | |
| 46 | err = devm_add_action(dev, gen_pci_unmap_cfg, cfg); |
| 47 | if (err) { |
| 48 | gen_pci_unmap_cfg(cfg); |
| 49 | goto err_out; |
| 50 | } |
| 51 | return cfg; |
| 52 | |
| 53 | err_out: |
| 54 | pci_free_resource_list(resources); |
| 55 | return ERR_PTR(err); |
| 56 | } |
| 57 | |
| 58 | int pci_host_common_probe(struct platform_device *pdev, |
| 59 | struct pci_ecam_ops *ops) |
| 60 | { |
| 61 | const char *type; |
| 62 | struct device *dev = &pdev->dev; |
| 63 | struct device_node *np = dev->of_node; |
| 64 | struct pci_host_bridge *bridge; |
| 65 | struct pci_config_window *cfg; |
| 66 | struct list_head resources; |
| 67 | int ret; |
| 68 | |
| 69 | bridge = devm_pci_alloc_host_bridge(dev, 0); |
| 70 | if (!bridge) |
| 71 | return -ENOMEM; |
| 72 | |
| 73 | type = of_get_property(np, "device_type", NULL); |
| 74 | if (!type || strcmp(type, "pci")) { |
| 75 | dev_err(dev, "invalid \"device_type\" %s\n", type); |
| 76 | return -EINVAL; |
| 77 | } |
| 78 | |
| 79 | of_pci_check_probe_only(); |
| 80 | |
| 81 | /* Parse and map our Configuration Space windows */ |
| 82 | cfg = gen_pci_init(dev, &resources, ops); |
| 83 | if (IS_ERR(cfg)) |
| 84 | return PTR_ERR(cfg); |
| 85 | |
| 86 | /* Do not reassign resources if probe only */ |
| 87 | if (!pci_has_flag(PCI_PROBE_ONLY)) |
| 88 | pci_add_flags(PCI_REASSIGN_ALL_BUS); |
| 89 | |
| 90 | list_splice_init(&resources, &bridge->windows); |
| 91 | bridge->dev.parent = dev; |
| 92 | bridge->sysdata = cfg; |
| 93 | bridge->busnr = cfg->busr.start; |
| 94 | bridge->ops = &ops->pci_ops; |
| 95 | bridge->map_irq = of_irq_parse_and_map_pci; |
| 96 | bridge->swizzle_irq = pci_common_swizzle; |
| 97 | |
| 98 | ret = pci_host_probe(bridge); |
| 99 | if (ret < 0) { |
| 100 | pci_free_resource_list(&resources); |
| 101 | return ret; |
| 102 | } |
| 103 | |
| 104 | platform_set_drvdata(pdev, bridge->bus); |
| 105 | return 0; |
| 106 | } |
| 107 | |
| 108 | int pci_host_common_remove(struct platform_device *pdev) |
| 109 | { |
| 110 | struct pci_bus *bus = platform_get_drvdata(pdev); |
| 111 | |
| 112 | pci_lock_rescan_remove(); |
| 113 | pci_stop_root_bus(bus); |
| 114 | pci_remove_root_bus(bus); |
| 115 | pci_unlock_rescan_remove(); |
| 116 | |
| 117 | return 0; |
| 118 | } |