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/acpi.h>
  30 #include <acpi/acpi_bus.h>
  31 #include <acpi/acpi_drivers.h>
  32
  33 #define _COMPONENT              ACPI_PCI_COMPONENT
  34 ACPI_MODULE_NAME("pci_bind");
  35
  36 static 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
  49 out:
  50         pci_dev_put(dev);
  51         return 0;
  52 }
  53
  54 static 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
  97 out:
  98         pci_dev_put(dev);
  99         return 0;
 100 }
 101
 102 int 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 }