linux-imx

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

/*

 * PCI Express Hot Plug Controller Driver

 *

 * Copyright (C) 1995,2001 Compaq Computer Corporation

 * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)

 * Copyright (C) 2001 IBM Corp.

 * Copyright (C) 2003-2004 Intel Corporation

 *

 * All rights reserved.

 *

 * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>

 *

 */

​

#include <linux/kernel.h>

#include <linux/types.h>

#include <linux/pci.h>

#include "../pci.h"

#include "pciehp.h"

​

/**

 * pciehp_configure_device() - enumerate PCI devices below a hotplug bridge

 * @ctrl: PCIe hotplug controller

 *

 * Enumerate PCI devices below a hotplug bridge and add them to the system.

 * Return 0 on success, %-EEXIST if the devices are already enumerated or

 * %-ENODEV if enumeration failed.

 */

int pciehp_configure_device(struct controller *ctrl)

{

    struct pci_dev *dev;

    struct pci_dev *bridge = ctrl->pcie->port;

    struct pci_bus *parent = bridge->subordinate;

    int num, ret = 0;

​

    pci_lock_rescan_remove();

​

    dev = pci_get_slot(parent, PCI_DEVFN(0, 0));

    if (dev) {

        /*

         * The device is already there. Either configured by the

         * boot firmware or a previous hotplug event.

         */

        ctrl_dbg(ctrl, "Device %s already exists at %04x:%02x:00, skipping hot-add\n",

             pci_name(dev), pci_domain_nr(parent), parent->number);

        pci_dev_put(dev);

        ret = -EEXIST;

        goto out;

    }

​

    num = pci_scan_slot(parent, PCI_DEVFN(0, 0));

    if (num == 0) {

        ctrl_err(ctrl, "No new device found\n");

        ret = -ENODEV;

        goto out;

    }

​

    for_each_pci_bridge(dev, parent)

        pci_hp_add_bridge(dev);

​

    pci_assign_unassigned_bridge_resources(bridge);

    pcie_bus_configure_settings(parent);