yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame] | 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 | } |