LXR linux/drivers/pci/controller/pci-host-common.c

   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
  18static void gen_pci_unmap_cfg(void *ptr)
  19{
  20        pci_ecam_free((struct pci_config_window *)ptr);
  21}
  22
  23static struct pci_config_window *gen_pci_init(struct device *dev,
  24                struct list_head *resources, const struct pci_ecam_ops *ops)
  25{
  26        int err;
  27        struct resource cfgres;
  28        struct resource *bus_range = NULL;
  29        struct pci_config_window *cfg;
  30
  31        /* Parse our PCI ranges and request their resources */
  32        err = pci_parse_request_of_pci_ranges(dev, resources, NULL, &bus_range);
  33        if (err)
  34                return ERR_PTR(err);
  35
  36        err = of_address_to_resource(dev->of_node, 0, &cfgres);
  37        if (err) {
  38                dev_err(dev, "missing \"reg\" property\n");
  39                goto err_out;
  40        }
  41
  42        cfg = pci_ecam_create(dev, &cfgres, bus_range, ops);
  43        if (IS_ERR(cfg)) {
  44                err = PTR_ERR(cfg);
  45                goto err_out;
  46        }
  47
  48        err = devm_add_action_or_reset(dev, gen_pci_unmap_cfg, cfg);
  49        if (err) {
  50                goto err_out;
  51        }
  52        return cfg;
  53
  54err_out:
  55        pci_free_resource_list(resources);
  56        return ERR_PTR(err);
  57}
  58
  59int pci_host_common_probe(struct platform_device *pdev)
  60{
  61        struct device *dev = &pdev->dev;
  62        struct pci_host_bridge *bridge;
  63        struct pci_config_window *cfg;
  64        struct list_head resources;
  65        const struct pci_ecam_ops *ops;
  66        int ret;
  67
  68        ops = of_device_get_match_data(&pdev->dev);
  69        if (!ops)
  70                return -ENODEV;
  71
  72        bridge = devm_pci_alloc_host_bridge(dev, 0);
  73        if (!bridge)
  74                return -ENOMEM;
  75
  76        of_pci_check_probe_only();
  77
  78        /* Parse and map our Configuration Space windows */
  79        cfg = gen_pci_init(dev, &resources, ops);
  80        if (IS_ERR(cfg))
  81                return PTR_ERR(cfg);
  82
  83        /* Do not reassign resources if probe only */
  84        if (!pci_has_flag(PCI_PROBE_ONLY))
  85                pci_add_flags(PCI_REASSIGN_ALL_BUS);
  86
  87        list_splice_init(&resources, &bridge->windows);
  88        bridge->dev.parent = dev;
  89        bridge->sysdata = cfg;
  90        bridge->busnr = cfg->busr.start;
  91        bridge->ops = (struct pci_ops *)&ops->pci_ops;
  92        bridge->map_irq = of_irq_parse_and_map_pci;
  93        bridge->swizzle_irq = pci_common_swizzle;
  94
  95        ret = pci_host_probe(bridge);
  96        if (ret < 0) {
  97                pci_free_resource_list(&resources);
  98                return ret;
  99        }
 100
 101        platform_set_drvdata(pdev, bridge->bus);
 102        return 0;
 103}
 104EXPORT_SYMBOL_GPL(pci_host_common_probe);
 105
 106int pci_host_common_remove(struct platform_device *pdev)
 107{
 108        struct pci_bus *bus = platform_get_drvdata(pdev);
 109
 110        pci_lock_rescan_remove();
 111        pci_stop_root_bus(bus);
 112        pci_remove_root_bus(bus);
 113        pci_unlock_rescan_remove();
 114
 115        return 0;
 116}
 117EXPORT_SYMBOL_GPL(pci_host_common_remove);
 118
 119MODULE_LICENSE("GPL v2");
 120