linux-imx

// SPDX-License-Identifier: GPL-2.0+

/*

 * PCI <-> OF mapping helpers

 *

 * Copyright 2011 IBM Corp.

 */

#define pr_fmt(fmt) "PCI: OF: " fmt

​

#include <linux/irqdomain.h>

#include <linux/kernel.h>

#include <linux/pci.h>

#include <linux/of.h>

#include <linux/of_irq.h>

#include <linux/of_address.h>

#include <linux/of_pci.h>

#include "pci.h"

​

void pci_set_of_node(struct pci_dev *dev)

{

    if (!dev->bus->dev.of_node)

        return;

    dev->dev.of_node = of_pci_find_child_device(dev->bus->dev.of_node,

                            dev->devfn);

}

​

void pci_release_of_node(struct pci_dev *dev)

{

    of_node_put(dev->dev.of_node);

    dev->dev.of_node = NULL;

}

​

void pci_set_bus_of_node(struct pci_bus *bus)

{

    if (bus->self == NULL)

        bus->dev.of_node = pcibios_get_phb_of_node(bus);

    else

        bus->dev.of_node = of_node_get(bus->self->dev.of_node);

}

​

void pci_release_bus_of_node(struct pci_bus *bus)

{

    of_node_put(bus->dev.of_node);

    bus->dev.of_node = NULL;

}

​

struct device_node * __weak pcibios_get_phb_of_node(struct pci_bus *bus)

{

    /* This should only be called for PHBs */

    if (WARN_ON(bus->self || bus->parent))

        return NULL;

​

    /*

     * Look for a node pointer in either the intermediary device we

     * create above the root bus or its own parent. Normally only

     * the later is populated.

     */

    if (bus->bridge->of_node)

        return of_node_get(bus->bridge->of_node);

    if (bus->bridge->parent && bus->bridge->parent->of_node)

        return of_node_get(bus->bridge->parent->of_node);

    return NULL;

}

​