drivers/acpi/pci_bind.c

   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
  36 ACPI_MODULE_NAME("pci_bind");
  37
  38 static 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
  49         if (!dev->subordinate)
  50                 goto out;
  51
  52         acpi_pci_irq_del_prt(dev->subordinate);
  53
  54         device->ops.bind = NULL;
  55         device->ops.unbind = NULL;
  56
  57 out:
  58         pci_dev_put(dev);
  59         return 0;
  60 }
  61
  62 static int acpi_pci_bind(struct acpi_device *device)
  63 {
  64         acpi_status status;
  65         acpi_handle handle;
  66         struct pci_bus *bus;
  67         struct pci_dev *dev;
  68
  69         dev = acpi_get_pci_dev(device->handle);
  70         if (!dev)
  71                 return 0;
  72
  73         pci_acpi_add_pm_notifier(device, dev);
  74         if (device->wakeup.flags.run_wake)
  75                 device_set_run_wake(&dev->dev, true);
  76
  77         /*
  78          * Install the 'bind' function to facilitate callbacks for
  79          * children of the P2P bridge.
  80          */
  81         if (dev->subordinate) {
  82                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
  83                                   "Device %04x:%02x:%02x.%d is a PCI bridge\n",
  84                                   pci_domain_nr(dev->bus), dev->bus->number,
  85                                   PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn)));
  86                 device->ops.bind = acpi_pci_bind;
  87                 device->ops.unbind = acpi_pci_unbind;
  88         }
  89
  90         /*
  91          * Evaluate and parse _PRT, if exists.  This code allows parsing of
  92          * _PRT objects within the scope of non-bridge devices.  Note that
  93          * _PRTs within the scope of a PCI bridge assume the bridge's
  94          * subordinate bus number.
  95          *
  96          * TBD: Can _PRTs exist within the scope of non-bridge PCI devices?
  97          */
  98         status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
  99         if (ACPI_FAILURE(status))
 100                 goto out;
 101
 102         if (dev->subordinate)
 103                 bus = dev->subordinate;
 104         else
 105                 bus = dev->bus;
 106
 107         acpi_pci_irq_add_prt(device->handle, bus);
 108
 109 out:
 110         pci_dev_put(dev);
 111         return 0;
 112 }
 113
 114 int acpi_pci_bind_root(struct acpi_device *device)
 115 {
 116         device->ops.bind = acpi_pci_bind;
 117         device->ops.unbind = acpi_pci_unbind;
 118
 119         return 0;
 120 }