pci/controller/pci-host-common.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * Generic PCI host driver common code
0004  *
0005  * Copyright (C) 2014 ARM Limited
0006  *
0007  * Author: Will Deacon <will.deacon@arm.com>
0008  */
0009
0010 #include <linux/kernel.h>
0011 #include <linux/module.h>
0012 #include <linux/of_address.h>
0013 #include <linux/of_device.h>
0014 #include <linux/of_pci.h>
0015 #include <linux/pci-ecam.h>
0016 #include <linux/platform_device.h>
0017
0018 static void gen_pci_unmap_cfg(void *ptr)
0019 {
0020     pci_ecam_free((struct pci_config_window *)ptr);
0021 }
0022
0023 static struct pci_config_window *gen_pci_init(struct device *dev,
0024         struct pci_host_bridge *bridge, const struct pci_ecam_ops *ops)
0025 {
0026     int err;
0027     struct resource cfgres;
0028     struct resource_entry *bus;
0029     struct pci_config_window *cfg;
0030
0031     err = of_address_to_resource(dev->of_node, 0, &cfgres);
0032     if (err) {
0033         dev_err(dev, "missing \"reg\" property\n");
0034         return ERR_PTR(err);
0035     }
0036
0037     bus = resource_list_first_type(&bridge->windows, IORESOURCE_BUS);
0038     if (!bus)
0039         return ERR_PTR(-ENODEV);
0040
0041     cfg = pci_ecam_create(dev, &cfgres, bus->res, ops);
0042     if (IS_ERR(cfg))
0043         return cfg;
0044
0045     err = devm_add_action_or_reset(dev, gen_pci_unmap_cfg, cfg);
0046     if (err)
0047         return ERR_PTR(err);
0048
0049     return cfg;
0050 }
0051
0052 int pci_host_common_probe(struct platform_device *pdev)
0053 {
0054     struct device *dev = &pdev->dev;
0055     struct pci_host_bridge *bridge;
0056     struct pci_config_window *cfg;
0057     const struct pci_ecam_ops *ops;
0058
0059     ops = of_device_get_match_data(&pdev->dev);
0060     if (!ops)
0061         return -ENODEV;
0062
0063     bridge = devm_pci_alloc_host_bridge(dev, 0);
0064     if (!bridge)
0065         return -ENOMEM;
0066
0067     platform_set_drvdata(pdev, bridge);
0068
0069     of_pci_check_probe_only();
0070
0071     /* Parse and map our Configuration Space windows */
0072     cfg = gen_pci_init(dev, bridge, ops);
0073     if (IS_ERR(cfg))
0074         return PTR_ERR(cfg);
0075
0076     /* Do not reassign resources if probe only */
0077     if (!pci_has_flag(PCI_PROBE_ONLY))
0078         pci_add_flags(PCI_REASSIGN_ALL_BUS);
0079
0080     bridge->sysdata = cfg;
0081     bridge->ops = (struct pci_ops *)&ops->pci_ops;
0082     bridge->msi_domain = true;
0083
0084     return pci_host_probe(bridge);
0085 }
0086 EXPORT_SYMBOL_GPL(pci_host_common_probe);
0087
0088 int pci_host_common_remove(struct platform_device *pdev)
0089 {
0090     struct pci_host_bridge *bridge = platform_get_drvdata(pdev);
0091
0092     pci_lock_rescan_remove();
0093     pci_stop_root_bus(bridge->bus);
0094     pci_remove_root_bus(bridge->bus);
0095     pci_unlock_rescan_remove();
0096
0097     return 0;
0098 }
0099 EXPORT_SYMBOL_GPL(pci_host_common_remove);
0100
0101 MODULE_LICENSE("GPL v2");