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
acpi_pci_unbind(struct acpi_device * device)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
acpi_pci_bind(struct acpi_device * device)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
acpi_pci_bind_root(struct acpi_device * device)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 }
121