pci-host-common.c

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Common library for PCI host controller drivers
  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.h>
 13#include <linux/of_address.h>
 14#include <linux/of_pci.h>
 15#include <linux/pci-ecam.h>
 16#include <linux/platform_device.h>
 17
 18#include "pci-host-common.h"
 19
 20static void gen_pci_unmap_cfg(void *ptr)
 21{
 22	pci_ecam_free((struct pci_config_window *)ptr);
 23}
 24
 25struct pci_config_window *pci_host_common_ecam_create(struct device *dev,
 26		struct pci_host_bridge *bridge, const struct pci_ecam_ops *ops)
 27{
 28	int err;
 29	struct resource cfgres;
 30	struct resource_entry *bus;
 31	struct pci_config_window *cfg;
 32
 33	err = of_address_to_resource(dev->of_node, 0, &cfgres);
 34	if (err) {
 35		dev_err(dev, "missing \"reg\" property\n");
 36		return ERR_PTR(err);
 37	}
 38
 39	bus = resource_list_first_type(&bridge->windows, IORESOURCE_BUS);
 40	if (!bus)
 41		return ERR_PTR(-ENODEV);
 42
 43	cfg = pci_ecam_create(dev, &cfgres, bus->res, ops);
 44	if (IS_ERR(cfg))
 45		return cfg;
 46
 47	err = devm_add_action_or_reset(dev, gen_pci_unmap_cfg, cfg);
 48	if (err)
 49		return ERR_PTR(err);
 50
 51	return cfg;
 52}
 53EXPORT_SYMBOL_GPL(pci_host_common_ecam_create);
 54
 55int pci_host_common_init(struct platform_device *pdev,
 56			 struct pci_host_bridge *bridge,
 57			 const struct pci_ecam_ops *ops)
 58{
 59	struct device *dev = &pdev->dev;
 60	struct pci_config_window *cfg;
 61
 62	of_pci_check_probe_only();
 63
 64	platform_set_drvdata(pdev, bridge);
 65
 66	/* Parse and map our Configuration Space windows */
 67	cfg = pci_host_common_ecam_create(dev, bridge, ops);
 68	if (IS_ERR(cfg))
 69		return PTR_ERR(cfg);
 70
 71	bridge->sysdata = cfg;
 72	bridge->ops = (struct pci_ops *)&ops->pci_ops;
 73	bridge->enable_device = ops->enable_device;
 74	bridge->disable_device = ops->disable_device;
 75	bridge->msi_domain = true;
 76
 77	return pci_host_probe(bridge);
 78}
 79EXPORT_SYMBOL_GPL(pci_host_common_init);
 80
 81int pci_host_common_probe(struct platform_device *pdev)
 82{
 83	const struct pci_ecam_ops *ops;
 84	struct pci_host_bridge *bridge;
 85
 86	ops = of_device_get_match_data(&pdev->dev);
 87	if (!ops)
 88		return -ENODEV;
 89
 90	bridge = devm_pci_alloc_host_bridge(&pdev->dev, 0);
 91	if (!bridge)
 92		return -ENOMEM;
 93
 94	return pci_host_common_init(pdev, bridge, ops);
 95}
 96EXPORT_SYMBOL_GPL(pci_host_common_probe);
 97
 98void pci_host_common_remove(struct platform_device *pdev)
 99{
100	struct pci_host_bridge *bridge = platform_get_drvdata(pdev);
101
102	pci_lock_rescan_remove();
103	pci_stop_root_bus(bridge->bus);
104	pci_remove_root_bus(bridge->bus);
105	pci_unlock_rescan_remove();
106}
107EXPORT_SYMBOL_GPL(pci_host_common_remove);
108
109MODULE_DESCRIPTION("Common library for PCI host controller drivers");
110MODULE_LICENSE("GPL v2");