linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * Host bridge related code

 */

​

#include <linux/kernel.h>

#include <linux/pci.h>

#include <linux/module.h>

​

#include "pci.h"

​

static struct pci_bus *find_pci_root_bus(struct pci_bus *bus)

{

    while (bus->parent)

        bus = bus->parent;

​

    return bus;

}

​

struct pci_host_bridge *pci_find_host_bridge(struct pci_bus *bus)

{

    struct pci_bus *root_bus = find_pci_root_bus(bus);

​

    return to_pci_host_bridge(root_bus->bridge);

}

​

struct device *pci_get_host_bridge_device(struct pci_dev *dev)

{

    struct pci_bus *root_bus = find_pci_root_bus(dev->bus);

    struct device *bridge = root_bus->bridge;

​

    kobject_get(&bridge->kobj);

    return bridge;

}

​

void  pci_put_host_bridge_device(struct device *dev)

{

    kobject_put(&dev->kobj);

}

​

void pci_set_host_bridge_release(struct pci_host_bridge *bridge,

                 void (*release_fn)(struct pci_host_bridge *),

                 void *release_data)

{

    bridge->release_fn = release_fn;

    bridge->release_data = release_data;

}

EXPORT_SYMBOL_GPL(pci_set_host_bridge_release);

​

void pcibios_resource_to_bus(struct pci_bus *bus, struct pci_bus_region *region,

                 struct resource *res)

{

    struct pci_host_bridge *bridge = pci_find_host_bridge(bus);

    struct resource_entry *window;

    resource_size_t offset = 0;

​

    resource_list_for_each_entry(window, &bridge->windows) {

        if (resource_contains(window->res, res)) {

            offset = window->offset;

            break;

        }

    }

​