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/of_address.h>
  12#include <linux/of_pci.h>
  13#include <linux/pci-ecam.h>
  14#include <linux/platform_device.h>
  15
  16static void gen_pci_unmap_cfg(void *ptr)
  17{
  18        pci_ecam_free((struct pci_config_window *)ptr);
  19}
  20
  21static 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
  53err_out:
  54        pci_free_resource_list(resources);
  55        return ERR_PTR(err);
  56}
  57
  58int pci_host_common_probe(struct platform_device *pdev,
  59                          struct pci_ecam_ops *ops)
  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        int ret;
  66
  67        bridge = devm_pci_alloc_host_bridge(dev, 0);
  68        if (!bridge)
  69                return -ENOMEM;
  70
  71        of_pci_check_probe_only();
  72
  73        /* Parse and map our Configuration Space windows */
  74        cfg = gen_pci_init(dev, &resources, ops);
  75        if (IS_ERR(cfg))
  76                return PTR_ERR(cfg);
  77
  78        /* Do not reassign resources if probe only */
  79        if (!pci_has_flag(PCI_PROBE_ONLY))
  80                pci_add_flags(PCI_REASSIGN_ALL_BUS);
  81
  82        list_splice_init(&resources, &bridge->windows);
  83        bridge->dev.parent = dev;
  84        bridge->sysdata = cfg;
  85        bridge->busnr = cfg->busr.start;
  86        bridge->ops = &ops->pci_ops;
  87        bridge->map_irq = of_irq_parse_and_map_pci;
  88        bridge->swizzle_irq = pci_common_swizzle;
  89
  90        ret = pci_host_probe(bridge);
  91        if (ret < 0) {
  92                pci_free_resource_list(&resources);
  93                return ret;
  94        }
  95
  96        platform_set_drvdata(pdev, bridge->bus);
  97        return 0;
  98}
  99
 100int pci_host_common_remove(struct platform_device *pdev)
 101{
 102        struct pci_bus *bus = platform_get_drvdata(pdev);
 103
 104        pci_lock_rescan_remove();
 105        pci_stop_root_bus(bus);
 106        pci_remove_root_bus(bus);
 107        pci_unlock_rescan_remove();
 108
 109        return 0;
 110}
 111