// SPDX-License-Identifier: GPL-2.0
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/*
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* Generic PCI host driver common code
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*
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* Copyright (C) 2014 ARM Limited
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*
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* Author: Will Deacon <will.deacon@arm.com>
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*/
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#include <linux/kernel.h>
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#include <linux/of_address.h>
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#include <linux/of_pci.h>
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#include <linux/pci-ecam.h>
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#include <linux/platform_device.h>
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static void gen_pci_unmap_cfg(void *ptr)
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{
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pci_ecam_free((struct pci_config_window *)ptr);
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}
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static struct pci_config_window *gen_pci_init(struct device *dev,
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struct list_head *resources, struct pci_ecam_ops *ops)
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{
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int err;
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struct resource cfgres;
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struct resource *bus_range = NULL;
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struct pci_config_window *cfg;
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/* Parse our PCI ranges and request their resources */
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err = pci_parse_request_of_pci_ranges(dev, resources, &bus_range);
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if (err)
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return ERR_PTR(err);
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err = of_address_to_resource(dev->of_node, 0, &cfgres);
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if (err) {
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dev_err(dev, "missing \"reg\" property\n");
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goto err_out;
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}
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cfg = pci_ecam_create(dev, &cfgres, bus_range, ops);
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if (IS_ERR(cfg)) {
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err = PTR_ERR(cfg);
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goto err_out;
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}
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err = devm_add_action(dev, gen_pci_unmap_cfg, cfg);
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if (err) {
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gen_pci_unmap_cfg(cfg);
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goto err_out;
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}
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return cfg;
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err_out:
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pci_free_resource_list(resources);
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return ERR_PTR(err);
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}
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int pci_host_common_probe(struct platform_device *pdev,
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struct pci_ecam_ops *ops)
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{
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const char *type;
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struct device *dev = &pdev->dev;
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struct device_node *np = dev->of_node;
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struct pci_host_bridge *bridge;
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struct pci_config_window *cfg;
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struct list_head resources;
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int ret;
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bridge = devm_pci_alloc_host_bridge(dev, 0);
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if (!bridge)
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return -ENOMEM;
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type = of_get_property(np, "device_type", NULL);
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if (!type || strcmp(type, "pci")) {
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dev_err(dev, "invalid \"device_type\" %s\n", type);
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return -EINVAL;
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}
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of_pci_check_probe_only();
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/* Parse and map our Configuration Space windows */
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cfg = gen_pci_init(dev, &resources, ops);
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if (IS_ERR(cfg))
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return PTR_ERR(cfg);
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/* Do not reassign resources if probe only */
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if (!pci_has_flag(PCI_PROBE_ONLY))
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pci_add_flags(PCI_REASSIGN_ALL_BUS);
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list_splice_init(&resources, &bridge->windows);
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bridge->dev.parent = dev;
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bridge->sysdata = cfg;
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bridge->busnr = cfg->busr.start;
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bridge->ops = &ops->pci_ops;
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bridge->map_irq = of_irq_parse_and_map_pci;
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bridge->swizzle_irq = pci_common_swizzle;
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ret = pci_host_probe(bridge);
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if (ret < 0) {
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pci_free_resource_list(&resources);
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return ret;
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}
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platform_set_drvdata(pdev, bridge->bus);
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return 0;
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}
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int pci_host_common_remove(struct platform_device *pdev)
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{
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struct pci_bus *bus = platform_get_drvdata(pdev);
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pci_lock_rescan_remove();
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pci_stop_root_bus(bus);
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pci_remove_root_bus(bus);
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pci_unlock_rescan_remove();
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return 0;
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}
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