linux/drivers/acpi/pci_bind.c
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   1/*
   2 *  pci_bind.c - ACPI PCI Device Binding ($Revision: 2 $)
   3 *
   4 *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   5 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6 *
   7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8 *
   9 *  This program is free software; you can redistribute it and/or modify
  10 *  it under the terms of the GNU General Public License as published by
  11 *  the Free Software Foundation; either version 2 of the License, or (at
  12 *  your option) any later version.
  13 *
  14 *  This program is distributed in the hope that it will be useful, but
  15 *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17 *  General Public License for more details.
  18 *
  19 *  You should have received a copy of the GNU General Public License along
  20 *  with this program; if not, write to the Free Software Foundation, Inc.,
  21 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22 *
  23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24 */
  25
  26#include <linux/kernel.h>
  27#include <linux/types.h>
  28#include <linux/pci.h>
  29#include <linux/pci-acpi.h>
  30#include <linux/acpi.h>
  31#include <linux/pm_runtime.h>
  32#include <acpi/acpi_bus.h>
  33#include <acpi/acpi_drivers.h>
  34
  35#define _COMPONENT              ACPI_PCI_COMPONENT
  36ACPI_MODULE_NAME("pci_bind");
  37
  38static int acpi_pci_unbind(struct acpi_device *device)
  39{
  40        struct pci_dev *dev;
  41
  42        dev = acpi_get_pci_dev(device->handle);
  43        if (!dev)
  44                goto out;
  45
  46        device_set_run_wake(&dev->dev, false);
  47        pci_acpi_remove_pm_notifier(device);
  48        acpi_power_resource_unregister_device(&dev->dev, device->handle);
  49
  50        if (!dev->subordinate)
  51                goto out;
  52
  53        acpi_pci_irq_del_prt(pci_domain_nr(dev->bus), dev->subordinate->number);
  54
  55        device->ops.bind = NULL;
  56        device->ops.unbind = NULL;
  57
  58out:
  59        pci_dev_put(dev);
  60        return 0;
  61}
  62
  63static int acpi_pci_bind(struct acpi_device *device)
  64{
  65        acpi_status status;
  66        acpi_handle handle;
  67        unsigned char bus;
  68        struct pci_dev *dev;
  69
  70        dev = acpi_get_pci_dev(device->handle);
  71        if (!dev)
  72                return 0;
  73
  74        pci_acpi_add_pm_notifier(device, dev);
  75        acpi_power_resource_register_device(&dev->dev, device->handle);
  76        if (device->wakeup.flags.run_wake)
  77                device_set_run_wake(&dev->dev, true);
  78
  79        /*
  80         * Install the 'bind' function to facilitate callbacks for
  81         * children of the P2P bridge.
  82         */
  83        if (dev->subordinate) {
  84                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
  85                                  "Device %04x:%02x:%02x.%d is a PCI bridge\n",
  86                                  pci_domain_nr(dev->bus), dev->bus->number,
  87                                  PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn)));
  88                device->ops.bind = acpi_pci_bind;
  89                device->ops.unbind = acpi_pci_unbind;
  90        }
  91
  92        /*
  93         * Evaluate and parse _PRT, if exists.  This code allows parsing of
  94         * _PRT objects within the scope of non-bridge devices.  Note that
  95         * _PRTs within the scope of a PCI bridge assume the bridge's
  96         * subordinate bus number.
  97         *
  98         * TBD: Can _PRTs exist within the scope of non-bridge PCI devices?
  99         */
 100        status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
 101        if (ACPI_FAILURE(status))
 102                goto out;
 103
 104        if (dev->subordinate)
 105                bus = dev->subordinate->number;
 106        else
 107                bus = dev->bus->number;
 108
 109        acpi_pci_irq_add_prt(device->handle, pci_domain_nr(dev->bus), bus);
 110
 111out:
 112        pci_dev_put(dev);
 113        return 0;
 114}
 115
 116int acpi_pci_bind_root(struct acpi_device *device)
 117{
 118        device->ops.bind = acpi_pci_bind;
 119        device->ops.unbind = acpi_pci_unbind;
 120
 121        return 0;
 122}
 123
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