Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * File: pci-acpi.c |
Len Brown | a406d9e | 2005-03-23 16:16:03 -0500 | [diff] [blame] | 3 | * Purpose: Provide PCI support in ACPI |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
David Shaohua Li | 84df749 | 2005-03-18 18:53:36 -0500 | [diff] [blame] | 5 | * Copyright (C) 2005 David Shaohua Li <shaohua.li@intel.com> |
| 6 | * Copyright (C) 2004 Tom Long Nguyen <tom.l.nguyen@intel.com> |
| 7 | * Copyright (C) 2004 Intel Corp. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | */ |
| 9 | |
| 10 | #include <linux/delay.h> |
| 11 | #include <linux/init.h> |
| 12 | #include <linux/pci.h> |
| 13 | #include <linux/module.h> |
Shaohua Li | 5fde244 | 2008-07-23 10:32:24 +0800 | [diff] [blame] | 14 | #include <linux/pci-aspm.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <acpi/acpi.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <acpi/acpi_bus.h> |
| 17 | |
| 18 | #include <linux/pci-acpi.h> |
Rafael J. Wysocki | b67ea76 | 2010-02-17 23:44:09 +0100 | [diff] [blame] | 19 | #include <linux/pm_runtime.h> |
David Shaohua Li | 0f64474 | 2005-03-19 00:15:48 -0500 | [diff] [blame] | 20 | #include "pci.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | |
Rafael J. Wysocki | b67ea76 | 2010-02-17 23:44:09 +0100 | [diff] [blame] | 22 | static DEFINE_MUTEX(pci_acpi_pm_notify_mtx); |
| 23 | |
| 24 | /** |
| 25 | * pci_acpi_wake_bus - Wake-up notification handler for root buses. |
| 26 | * @handle: ACPI handle of a device the notification is for. |
| 27 | * @event: Type of the signaled event. |
| 28 | * @context: PCI root bus to wake up devices on. |
| 29 | */ |
| 30 | static void pci_acpi_wake_bus(acpi_handle handle, u32 event, void *context) |
| 31 | { |
| 32 | struct pci_bus *pci_bus = context; |
| 33 | |
| 34 | if (event == ACPI_NOTIFY_DEVICE_WAKE && pci_bus) |
| 35 | pci_pme_wakeup_bus(pci_bus); |
| 36 | } |
| 37 | |
| 38 | /** |
| 39 | * pci_acpi_wake_dev - Wake-up notification handler for PCI devices. |
| 40 | * @handle: ACPI handle of a device the notification is for. |
| 41 | * @event: Type of the signaled event. |
| 42 | * @context: PCI device object to wake up. |
| 43 | */ |
| 44 | static void pci_acpi_wake_dev(acpi_handle handle, u32 event, void *context) |
| 45 | { |
| 46 | struct pci_dev *pci_dev = context; |
| 47 | |
| 48 | if (event == ACPI_NOTIFY_DEVICE_WAKE && pci_dev) { |
Rafael J. Wysocki | 0f953bf | 2010-12-29 13:22:08 +0100 | [diff] [blame] | 49 | pci_wakeup_event(pci_dev); |
Rafael J. Wysocki | b67ea76 | 2010-02-17 23:44:09 +0100 | [diff] [blame] | 50 | pci_check_pme_status(pci_dev); |
| 51 | pm_runtime_resume(&pci_dev->dev); |
| 52 | if (pci_dev->subordinate) |
| 53 | pci_pme_wakeup_bus(pci_dev->subordinate); |
| 54 | } |
| 55 | } |
| 56 | |
| 57 | /** |
| 58 | * add_pm_notifier - Register PM notifier for given ACPI device. |
| 59 | * @dev: ACPI device to add the notifier for. |
| 60 | * @context: PCI device or bus to check for PME status if an event is signaled. |
| 61 | * |
| 62 | * NOTE: @dev need not be a run-wake or wake-up device to be a valid source of |
| 63 | * PM wake-up events. For example, wake-up events may be generated for bridges |
| 64 | * if one of the devices below the bridge is signaling PME, even if the bridge |
| 65 | * itself doesn't have a wake-up GPE associated with it. |
| 66 | */ |
| 67 | static acpi_status add_pm_notifier(struct acpi_device *dev, |
| 68 | acpi_notify_handler handler, |
| 69 | void *context) |
| 70 | { |
| 71 | acpi_status status = AE_ALREADY_EXISTS; |
| 72 | |
| 73 | mutex_lock(&pci_acpi_pm_notify_mtx); |
| 74 | |
| 75 | if (dev->wakeup.flags.notifier_present) |
| 76 | goto out; |
| 77 | |
| 78 | status = acpi_install_notify_handler(dev->handle, |
| 79 | ACPI_SYSTEM_NOTIFY, |
| 80 | handler, context); |
| 81 | if (ACPI_FAILURE(status)) |
| 82 | goto out; |
| 83 | |
| 84 | dev->wakeup.flags.notifier_present = true; |
| 85 | |
| 86 | out: |
| 87 | mutex_unlock(&pci_acpi_pm_notify_mtx); |
| 88 | return status; |
| 89 | } |
| 90 | |
| 91 | /** |
| 92 | * remove_pm_notifier - Unregister PM notifier from given ACPI device. |
| 93 | * @dev: ACPI device to remove the notifier from. |
| 94 | */ |
| 95 | static acpi_status remove_pm_notifier(struct acpi_device *dev, |
| 96 | acpi_notify_handler handler) |
| 97 | { |
| 98 | acpi_status status = AE_BAD_PARAMETER; |
| 99 | |
| 100 | mutex_lock(&pci_acpi_pm_notify_mtx); |
| 101 | |
| 102 | if (!dev->wakeup.flags.notifier_present) |
| 103 | goto out; |
| 104 | |
| 105 | status = acpi_remove_notify_handler(dev->handle, |
| 106 | ACPI_SYSTEM_NOTIFY, |
| 107 | handler); |
| 108 | if (ACPI_FAILURE(status)) |
| 109 | goto out; |
| 110 | |
| 111 | dev->wakeup.flags.notifier_present = false; |
| 112 | |
| 113 | out: |
| 114 | mutex_unlock(&pci_acpi_pm_notify_mtx); |
| 115 | return status; |
| 116 | } |
| 117 | |
| 118 | /** |
| 119 | * pci_acpi_add_bus_pm_notifier - Register PM notifier for given PCI bus. |
| 120 | * @dev: ACPI device to add the notifier for. |
| 121 | * @pci_bus: PCI bus to walk checking for PME status if an event is signaled. |
| 122 | */ |
| 123 | acpi_status pci_acpi_add_bus_pm_notifier(struct acpi_device *dev, |
| 124 | struct pci_bus *pci_bus) |
| 125 | { |
| 126 | return add_pm_notifier(dev, pci_acpi_wake_bus, pci_bus); |
| 127 | } |
| 128 | |
| 129 | /** |
| 130 | * pci_acpi_remove_bus_pm_notifier - Unregister PCI bus PM notifier. |
| 131 | * @dev: ACPI device to remove the notifier from. |
| 132 | */ |
| 133 | acpi_status pci_acpi_remove_bus_pm_notifier(struct acpi_device *dev) |
| 134 | { |
| 135 | return remove_pm_notifier(dev, pci_acpi_wake_bus); |
| 136 | } |
| 137 | |
| 138 | /** |
| 139 | * pci_acpi_add_pm_notifier - Register PM notifier for given PCI device. |
| 140 | * @dev: ACPI device to add the notifier for. |
| 141 | * @pci_dev: PCI device to check for the PME status if an event is signaled. |
| 142 | */ |
| 143 | acpi_status pci_acpi_add_pm_notifier(struct acpi_device *dev, |
| 144 | struct pci_dev *pci_dev) |
| 145 | { |
| 146 | return add_pm_notifier(dev, pci_acpi_wake_dev, pci_dev); |
| 147 | } |
| 148 | |
| 149 | /** |
| 150 | * pci_acpi_remove_pm_notifier - Unregister PCI device PM notifier. |
| 151 | * @dev: ACPI device to remove the notifier from. |
| 152 | */ |
| 153 | acpi_status pci_acpi_remove_pm_notifier(struct acpi_device *dev) |
| 154 | { |
| 155 | return remove_pm_notifier(dev, pci_acpi_wake_dev); |
| 156 | } |
| 157 | |
David Shaohua Li | 0f64474 | 2005-03-19 00:15:48 -0500 | [diff] [blame] | 158 | /* |
| 159 | * _SxD returns the D-state with the highest power |
| 160 | * (lowest D-state number) supported in the S-state "x". |
| 161 | * |
| 162 | * If the devices does not have a _PRW |
| 163 | * (Power Resources for Wake) supporting system wakeup from "x" |
| 164 | * then the OS is free to choose a lower power (higher number |
| 165 | * D-state) than the return value from _SxD. |
| 166 | * |
| 167 | * But if _PRW is enabled at S-state "x", the OS |
| 168 | * must not choose a power lower than _SxD -- |
| 169 | * unless the device has an _SxW method specifying |
| 170 | * the lowest power (highest D-state number) the device |
| 171 | * may enter while still able to wake the system. |
| 172 | * |
| 173 | * ie. depending on global OS policy: |
| 174 | * |
| 175 | * if (_PRW at S-state x) |
| 176 | * choose from highest power _SxD to lowest power _SxW |
| 177 | * else // no _PRW at S-state x |
| 178 | * choose highest power _SxD or any lower power |
David Shaohua Li | 0f64474 | 2005-03-19 00:15:48 -0500 | [diff] [blame] | 179 | */ |
| 180 | |
Rafael J. Wysocki | 8d2bdf4 | 2008-06-05 01:16:37 +0200 | [diff] [blame] | 181 | static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev) |
David Shaohua Li | 0f64474 | 2005-03-19 00:15:48 -0500 | [diff] [blame] | 182 | { |
Shaohua Li | ab826ca | 2007-07-20 10:03:22 +0800 | [diff] [blame] | 183 | int acpi_state; |
David Shaohua Li | 0f64474 | 2005-03-19 00:15:48 -0500 | [diff] [blame] | 184 | |
David Brownell | 0616678 | 2008-06-05 01:15:40 +0200 | [diff] [blame] | 185 | acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL); |
Shaohua Li | ab826ca | 2007-07-20 10:03:22 +0800 | [diff] [blame] | 186 | if (acpi_state < 0) |
| 187 | return PCI_POWER_ERROR; |
| 188 | |
| 189 | switch (acpi_state) { |
| 190 | case ACPI_STATE_D0: |
| 191 | return PCI_D0; |
| 192 | case ACPI_STATE_D1: |
| 193 | return PCI_D1; |
| 194 | case ACPI_STATE_D2: |
| 195 | return PCI_D2; |
| 196 | case ACPI_STATE_D3: |
| 197 | return PCI_D3hot; |
| 198 | } |
| 199 | return PCI_POWER_ERROR; |
David Shaohua Li | 0f64474 | 2005-03-19 00:15:48 -0500 | [diff] [blame] | 200 | } |
Rafael J. Wysocki | 961d912 | 2008-07-07 03:32:02 +0200 | [diff] [blame] | 201 | |
| 202 | static bool acpi_pci_power_manageable(struct pci_dev *dev) |
| 203 | { |
| 204 | acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev); |
| 205 | |
| 206 | return handle ? acpi_bus_power_manageable(handle) : false; |
| 207 | } |
David Shaohua Li | 0f64474 | 2005-03-19 00:15:48 -0500 | [diff] [blame] | 208 | |
David Shaohua Li | b913100 | 2005-03-19 00:16:18 -0500 | [diff] [blame] | 209 | static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state) |
| 210 | { |
| 211 | acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev); |
Shaohua Li | 10b3dca | 2007-07-20 10:03:25 +0800 | [diff] [blame] | 212 | acpi_handle tmp; |
David Brownell | 583c377 | 2008-02-22 21:41:51 -0800 | [diff] [blame] | 213 | static const u8 state_conv[] = { |
| 214 | [PCI_D0] = ACPI_STATE_D0, |
| 215 | [PCI_D1] = ACPI_STATE_D1, |
| 216 | [PCI_D2] = ACPI_STATE_D2, |
| 217 | [PCI_D3hot] = ACPI_STATE_D3, |
| 218 | [PCI_D3cold] = ACPI_STATE_D3 |
David Shaohua Li | b913100 | 2005-03-19 00:16:18 -0500 | [diff] [blame] | 219 | }; |
Rafael J. Wysocki | 44e4e66 | 2008-07-07 03:32:52 +0200 | [diff] [blame] | 220 | int error = -EINVAL; |
David Shaohua Li | b913100 | 2005-03-19 00:16:18 -0500 | [diff] [blame] | 221 | |
Shaohua Li | 10b3dca | 2007-07-20 10:03:25 +0800 | [diff] [blame] | 222 | /* If the ACPI device has _EJ0, ignore the device */ |
Rafael J. Wysocki | 44e4e66 | 2008-07-07 03:32:52 +0200 | [diff] [blame] | 223 | if (!handle || ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp))) |
| 224 | return -ENODEV; |
David Brownell | 583c377 | 2008-02-22 21:41:51 -0800 | [diff] [blame] | 225 | |
| 226 | switch (state) { |
| 227 | case PCI_D0: |
| 228 | case PCI_D1: |
| 229 | case PCI_D2: |
| 230 | case PCI_D3hot: |
| 231 | case PCI_D3cold: |
Rafael J. Wysocki | 44e4e66 | 2008-07-07 03:32:52 +0200 | [diff] [blame] | 232 | error = acpi_bus_set_power(handle, state_conv[state]); |
David Brownell | 583c377 | 2008-02-22 21:41:51 -0800 | [diff] [blame] | 233 | } |
Rafael J. Wysocki | 44e4e66 | 2008-07-07 03:32:52 +0200 | [diff] [blame] | 234 | |
| 235 | if (!error) |
| 236 | dev_printk(KERN_INFO, &dev->dev, |
| 237 | "power state changed by ACPI to D%d\n", state); |
| 238 | |
| 239 | return error; |
David Shaohua Li | b913100 | 2005-03-19 00:16:18 -0500 | [diff] [blame] | 240 | } |
| 241 | |
Rafael J. Wysocki | eb9d0fe | 2008-07-07 03:34:48 +0200 | [diff] [blame] | 242 | static bool acpi_pci_can_wakeup(struct pci_dev *dev) |
| 243 | { |
| 244 | acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev); |
| 245 | |
| 246 | return handle ? acpi_bus_can_wakeup(handle) : false; |
| 247 | } |
| 248 | |
Rafael J. Wysocki | 0baed8d | 2009-09-08 23:16:24 +0200 | [diff] [blame] | 249 | static void acpi_pci_propagate_wakeup_enable(struct pci_bus *bus, bool enable) |
| 250 | { |
| 251 | while (bus->parent) { |
Rafael J. Wysocki | dc1a94a | 2009-11-29 16:35:54 +0100 | [diff] [blame] | 252 | if (!acpi_pm_device_sleep_wake(&bus->self->dev, enable)) |
Rafael J. Wysocki | 0baed8d | 2009-09-08 23:16:24 +0200 | [diff] [blame] | 253 | return; |
| 254 | bus = bus->parent; |
| 255 | } |
| 256 | |
| 257 | /* We have reached the root bus. */ |
| 258 | if (bus->bridge) |
| 259 | acpi_pm_device_sleep_wake(bus->bridge, enable); |
| 260 | } |
| 261 | |
Rafael J. Wysocki | eb9d0fe | 2008-07-07 03:34:48 +0200 | [diff] [blame] | 262 | static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable) |
| 263 | { |
Rafael J. Wysocki | 0baed8d | 2009-09-08 23:16:24 +0200 | [diff] [blame] | 264 | if (acpi_pci_can_wakeup(dev)) |
| 265 | return acpi_pm_device_sleep_wake(&dev->dev, enable); |
| 266 | |
Rafael J. Wysocki | dc1a94a | 2009-11-29 16:35:54 +0100 | [diff] [blame] | 267 | acpi_pci_propagate_wakeup_enable(dev->bus, enable); |
Rafael J. Wysocki | 0baed8d | 2009-09-08 23:16:24 +0200 | [diff] [blame] | 268 | return 0; |
Rafael J. Wysocki | eb9d0fe | 2008-07-07 03:34:48 +0200 | [diff] [blame] | 269 | } |
| 270 | |
Rafael J. Wysocki | b67ea76 | 2010-02-17 23:44:09 +0100 | [diff] [blame] | 271 | /** |
| 272 | * acpi_dev_run_wake - Enable/disable wake-up for given device. |
| 273 | * @phys_dev: Device to enable/disable the platform to wake-up the system for. |
| 274 | * @enable: Whether enable or disable the wake-up functionality. |
| 275 | * |
| 276 | * Find the ACPI device object corresponding to @pci_dev and try to |
| 277 | * enable/disable the GPE associated with it. |
| 278 | */ |
| 279 | static int acpi_dev_run_wake(struct device *phys_dev, bool enable) |
| 280 | { |
| 281 | struct acpi_device *dev; |
| 282 | acpi_handle handle; |
| 283 | int error = -ENODEV; |
| 284 | |
| 285 | if (!device_run_wake(phys_dev)) |
| 286 | return -EINVAL; |
| 287 | |
| 288 | handle = DEVICE_ACPI_HANDLE(phys_dev); |
| 289 | if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &dev))) { |
| 290 | dev_dbg(phys_dev, "ACPI handle has no context in %s!\n", |
| 291 | __func__); |
| 292 | return -ENODEV; |
| 293 | } |
| 294 | |
| 295 | if (enable) { |
| 296 | if (!dev->wakeup.run_wake_count++) { |
| 297 | acpi_enable_wakeup_device_power(dev, ACPI_STATE_S0); |
| 298 | acpi_enable_gpe(dev->wakeup.gpe_device, |
Rafael J. Wysocki | a44061a | 2010-07-01 10:11:45 +0800 | [diff] [blame] | 299 | dev->wakeup.gpe_number); |
Rafael J. Wysocki | b67ea76 | 2010-02-17 23:44:09 +0100 | [diff] [blame] | 300 | } |
| 301 | } else if (dev->wakeup.run_wake_count > 0) { |
| 302 | if (!--dev->wakeup.run_wake_count) { |
| 303 | acpi_disable_gpe(dev->wakeup.gpe_device, |
Rafael J. Wysocki | a44061a | 2010-07-01 10:11:45 +0800 | [diff] [blame] | 304 | dev->wakeup.gpe_number); |
Rafael J. Wysocki | b67ea76 | 2010-02-17 23:44:09 +0100 | [diff] [blame] | 305 | acpi_disable_wakeup_device_power(dev); |
| 306 | } |
| 307 | } else { |
| 308 | error = -EALREADY; |
| 309 | } |
| 310 | |
| 311 | return error; |
| 312 | } |
| 313 | |
| 314 | static void acpi_pci_propagate_run_wake(struct pci_bus *bus, bool enable) |
| 315 | { |
| 316 | while (bus->parent) { |
| 317 | struct pci_dev *bridge = bus->self; |
| 318 | |
| 319 | if (bridge->pme_interrupt) |
| 320 | return; |
| 321 | if (!acpi_dev_run_wake(&bridge->dev, enable)) |
| 322 | return; |
| 323 | bus = bus->parent; |
| 324 | } |
| 325 | |
| 326 | /* We have reached the root bus. */ |
| 327 | if (bus->bridge) |
| 328 | acpi_dev_run_wake(bus->bridge, enable); |
| 329 | } |
| 330 | |
| 331 | static int acpi_pci_run_wake(struct pci_dev *dev, bool enable) |
| 332 | { |
| 333 | if (dev->pme_interrupt) |
| 334 | return 0; |
| 335 | |
| 336 | if (!acpi_dev_run_wake(&dev->dev, enable)) |
| 337 | return 0; |
| 338 | |
| 339 | acpi_pci_propagate_run_wake(dev->bus, enable); |
| 340 | return 0; |
| 341 | } |
| 342 | |
Rafael J. Wysocki | 961d912 | 2008-07-07 03:32:02 +0200 | [diff] [blame] | 343 | static struct pci_platform_pm_ops acpi_pci_platform_pm = { |
| 344 | .is_manageable = acpi_pci_power_manageable, |
| 345 | .set_state = acpi_pci_set_power_state, |
| 346 | .choose_state = acpi_pci_choose_state, |
Rafael J. Wysocki | eb9d0fe | 2008-07-07 03:34:48 +0200 | [diff] [blame] | 347 | .can_wakeup = acpi_pci_can_wakeup, |
| 348 | .sleep_wake = acpi_pci_sleep_wake, |
Rafael J. Wysocki | b67ea76 | 2010-02-17 23:44:09 +0100 | [diff] [blame] | 349 | .run_wake = acpi_pci_run_wake, |
Rafael J. Wysocki | 961d912 | 2008-07-07 03:32:02 +0200 | [diff] [blame] | 350 | }; |
David Shaohua Li | b913100 | 2005-03-19 00:16:18 -0500 | [diff] [blame] | 351 | |
David Shaohua Li | 84df749 | 2005-03-18 18:53:36 -0500 | [diff] [blame] | 352 | /* ACPI bus type */ |
Muthu Kumar | 9c273b9 | 2006-04-28 00:42:21 -0700 | [diff] [blame] | 353 | static int acpi_pci_find_device(struct device *dev, acpi_handle *handle) |
David Shaohua Li | 84df749 | 2005-03-18 18:53:36 -0500 | [diff] [blame] | 354 | { |
| 355 | struct pci_dev * pci_dev; |
Lin Ming | 439913f | 2010-01-28 10:53:19 +0800 | [diff] [blame] | 356 | u64 addr; |
David Shaohua Li | 84df749 | 2005-03-18 18:53:36 -0500 | [diff] [blame] | 357 | |
| 358 | pci_dev = to_pci_dev(dev); |
| 359 | /* Please ref to ACPI spec for the syntax of _ADR */ |
| 360 | addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn); |
| 361 | *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr); |
| 362 | if (!*handle) |
| 363 | return -ENODEV; |
| 364 | return 0; |
| 365 | } |
| 366 | |
Muthu Kumar | 9c273b9 | 2006-04-28 00:42:21 -0700 | [diff] [blame] | 367 | static int acpi_pci_find_root_bridge(struct device *dev, acpi_handle *handle) |
David Shaohua Li | 84df749 | 2005-03-18 18:53:36 -0500 | [diff] [blame] | 368 | { |
| 369 | int num; |
| 370 | unsigned int seg, bus; |
| 371 | |
| 372 | /* |
| 373 | * The string should be the same as root bridge's name |
| 374 | * Please look at 'pci_scan_bus_parented' |
| 375 | */ |
Kay Sievers | 1a92713 | 2008-10-30 02:17:49 +0100 | [diff] [blame] | 376 | num = sscanf(dev_name(dev), "pci%04x:%02x", &seg, &bus); |
David Shaohua Li | 84df749 | 2005-03-18 18:53:36 -0500 | [diff] [blame] | 377 | if (num != 2) |
| 378 | return -ENODEV; |
| 379 | *handle = acpi_get_pci_rootbridge_handle(seg, bus); |
| 380 | if (!*handle) |
| 381 | return -ENODEV; |
| 382 | return 0; |
| 383 | } |
| 384 | |
Muthu Kumar | 9c273b9 | 2006-04-28 00:42:21 -0700 | [diff] [blame] | 385 | static struct acpi_bus_type acpi_pci_bus = { |
David Shaohua Li | 84df749 | 2005-03-18 18:53:36 -0500 | [diff] [blame] | 386 | .bus = &pci_bus_type, |
Muthu Kumar | 9c273b9 | 2006-04-28 00:42:21 -0700 | [diff] [blame] | 387 | .find_device = acpi_pci_find_device, |
| 388 | .find_bridge = acpi_pci_find_root_bridge, |
David Shaohua Li | 84df749 | 2005-03-18 18:53:36 -0500 | [diff] [blame] | 389 | }; |
| 390 | |
Muthu Kumar | 9c273b9 | 2006-04-28 00:42:21 -0700 | [diff] [blame] | 391 | static int __init acpi_pci_init(void) |
David Shaohua Li | 84df749 | 2005-03-18 18:53:36 -0500 | [diff] [blame] | 392 | { |
| 393 | int ret; |
| 394 | |
Bob Moore | 993958f | 2009-02-03 15:14:33 +0800 | [diff] [blame] | 395 | if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_MSI) { |
Shaohua Li | f8993af | 2007-04-25 11:05:12 +0800 | [diff] [blame] | 396 | printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n"); |
| 397 | pci_no_msi(); |
| 398 | } |
Shaohua Li | 5fde244 | 2008-07-23 10:32:24 +0800 | [diff] [blame] | 399 | |
Bob Moore | 993958f | 2009-02-03 15:14:33 +0800 | [diff] [blame] | 400 | if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) { |
Shaohua Li | 5fde244 | 2008-07-23 10:32:24 +0800 | [diff] [blame] | 401 | printk(KERN_INFO"ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n"); |
Matthew Garrett | 2f671e2 | 2010-12-06 14:00:56 -0500 | [diff] [blame] | 402 | pcie_clear_aspm(); |
Shaohua Li | 5fde244 | 2008-07-23 10:32:24 +0800 | [diff] [blame] | 403 | pcie_no_aspm(); |
| 404 | } |
| 405 | |
Muthu Kumar | 9c273b9 | 2006-04-28 00:42:21 -0700 | [diff] [blame] | 406 | ret = register_acpi_bus_type(&acpi_pci_bus); |
David Shaohua Li | 84df749 | 2005-03-18 18:53:36 -0500 | [diff] [blame] | 407 | if (ret) |
| 408 | return 0; |
Rafael J. Wysocki | 961d912 | 2008-07-07 03:32:02 +0200 | [diff] [blame] | 409 | pci_set_platform_pm(&acpi_pci_platform_pm); |
David Shaohua Li | 84df749 | 2005-03-18 18:53:36 -0500 | [diff] [blame] | 410 | return 0; |
| 411 | } |
Muthu Kumar | 9c273b9 | 2006-04-28 00:42:21 -0700 | [diff] [blame] | 412 | arch_initcall(acpi_pci_init); |