LXR linux/drivers/acpi/pci

   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/acpi.h>
  30#include <acpi/acpi_bus.h>
  31#include <acpi/acpi_drivers.h>
  32
  33#define _COMPONENT              ACPI_PCI_COMPONENT
  34ACPI_MODULE_NAME("pci_bind");
  35
  36static int acpi_pci_unbind(struct acpi_device *device)
  37{
  38        struct pci_dev *dev;
  39
  40        dev = acpi_get_pci_dev(device->handle);
  41        if (!dev || !dev->subordinate)
  42                goto out;
  43
  44        acpi_pci_irq_del_prt(dev->subordinate);
  45
  46        device->ops.bind = NULL;
  47        device->ops.unbind = NULL;
  48
  49out:
  50        pci_dev_put(dev);
  51        return 0;
  52}
  53
  54static int acpi_pci_bind(struct acpi_device *device)
  55{
  56        acpi_status status;
  57        acpi_handle handle;
  58        struct pci_bus *bus;
  59        struct pci_dev *dev;
  60
  61        dev = acpi_get_pci_dev(device->handle);
  62        if (!dev)
  63                return 0;
  64
  65        /*
  66         * Install the 'bind' function to facilitate callbacks for
  67         * children of the P2P bridge.
  68         */
  69        if (dev->subordinate) {
  70                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
  71                                  "Device %04x:%02x:%02x.%d is a PCI bridge\n",
  72                                  pci_domain_nr(dev->bus), dev->bus->number,
  73                                  PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn)));
  74                device->ops.bind = acpi_pci_bind;
  75                device->ops.unbind = acpi_pci_unbind;
  76        }
  77
  78        /*
  79         * Evaluate and parse _PRT, if exists.  This code allows parsing of
  80         * _PRT objects within the scope of non-bridge devices.  Note that
  81         * _PRTs within the scope of a PCI bridge assume the bridge's
  82         * subordinate bus number.
  83         *
  84         * TBD: Can _PRTs exist within the scope of non-bridge PCI devices?
  85         */
  86        status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
  87        if (ACPI_FAILURE(status))
  88                goto out;
  89
  90        if (dev->subordinate)
  91                bus = dev->subordinate;
  92        else
  93                bus = dev->bus;
  94
  95        acpi_pci_irq_add_prt(device->handle, bus);
  96
  97out:
  98        pci_dev_put(dev);
  99        return 0;
 100}
 101
 102int acpi_pci_bind_root(struct acpi_device *device)
 103{
 104        device->ops.bind = acpi_pci_bind;
 105        device->ops.unbind = acpi_pci_unbind;
 106
 107        return 0;
 108}
 109