Loading...
1/*
2 * File: pci-acpi.c
3 * Purpose: Provide PCI support in ACPI
4 *
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.
8 */
9
10#include <linux/delay.h>
11#include <linux/init.h>
12#include <linux/pci.h>
13#include <linux/module.h>
14#include <linux/pci-aspm.h>
15#include <acpi/acpi.h>
16#include <acpi/acpi_bus.h>
17
18#include <linux/pci-acpi.h>
19#include <linux/pm_runtime.h>
20#include "pci.h"
21
22static 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 */
30static 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 */
44static 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) {
49 pci_wakeup_event(pci_dev);
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 */
67static 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 */
95static 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 */
123acpi_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 */
133acpi_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 */
143acpi_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 */
153acpi_status pci_acpi_remove_pm_notifier(struct acpi_device *dev)
154{
155 return remove_pm_notifier(dev, pci_acpi_wake_dev);
156}
157
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
179 */
180
181static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
182{
183 int acpi_state;
184
185 acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL);
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 case ACPI_STATE_D3_COLD:
199 return PCI_D3cold;
200 }
201 return PCI_POWER_ERROR;
202}
203
204static bool acpi_pci_power_manageable(struct pci_dev *dev)
205{
206 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
207
208 return handle ? acpi_bus_power_manageable(handle) : false;
209}
210
211static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
212{
213 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
214 acpi_handle tmp;
215 static const u8 state_conv[] = {
216 [PCI_D0] = ACPI_STATE_D0,
217 [PCI_D1] = ACPI_STATE_D1,
218 [PCI_D2] = ACPI_STATE_D2,
219 [PCI_D3hot] = ACPI_STATE_D3,
220 [PCI_D3cold] = ACPI_STATE_D3
221 };
222 int error = -EINVAL;
223
224 /* If the ACPI device has _EJ0, ignore the device */
225 if (!handle || ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
226 return -ENODEV;
227
228 switch (state) {
229 case PCI_D0:
230 case PCI_D1:
231 case PCI_D2:
232 case PCI_D3hot:
233 case PCI_D3cold:
234 error = acpi_bus_set_power(handle, state_conv[state]);
235 }
236
237 if (!error)
238 dev_printk(KERN_INFO, &dev->dev,
239 "power state changed by ACPI to D%d\n", state);
240
241 return error;
242}
243
244static bool acpi_pci_can_wakeup(struct pci_dev *dev)
245{
246 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
247
248 return handle ? acpi_bus_can_wakeup(handle) : false;
249}
250
251static void acpi_pci_propagate_wakeup_enable(struct pci_bus *bus, bool enable)
252{
253 while (bus->parent) {
254 if (!acpi_pm_device_sleep_wake(&bus->self->dev, enable))
255 return;
256 bus = bus->parent;
257 }
258
259 /* We have reached the root bus. */
260 if (bus->bridge)
261 acpi_pm_device_sleep_wake(bus->bridge, enable);
262}
263
264static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable)
265{
266 if (acpi_pci_can_wakeup(dev))
267 return acpi_pm_device_sleep_wake(&dev->dev, enable);
268
269 acpi_pci_propagate_wakeup_enable(dev->bus, enable);
270 return 0;
271}
272
273/**
274 * acpi_dev_run_wake - Enable/disable wake-up for given device.
275 * @phys_dev: Device to enable/disable the platform to wake-up the system for.
276 * @enable: Whether enable or disable the wake-up functionality.
277 *
278 * Find the ACPI device object corresponding to @pci_dev and try to
279 * enable/disable the GPE associated with it.
280 */
281static int acpi_dev_run_wake(struct device *phys_dev, bool enable)
282{
283 struct acpi_device *dev;
284 acpi_handle handle;
285 int error = -ENODEV;
286
287 if (!device_run_wake(phys_dev))
288 return -EINVAL;
289
290 handle = DEVICE_ACPI_HANDLE(phys_dev);
291 if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &dev))) {
292 dev_dbg(phys_dev, "ACPI handle has no context in %s!\n",
293 __func__);
294 return -ENODEV;
295 }
296
297 if (enable) {
298 acpi_enable_wakeup_device_power(dev, ACPI_STATE_S0);
299 acpi_enable_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number);
300 } else {
301 acpi_disable_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number);
302 acpi_disable_wakeup_device_power(dev);
303 }
304
305 return error;
306}
307
308static void acpi_pci_propagate_run_wake(struct pci_bus *bus, bool enable)
309{
310 while (bus->parent) {
311 struct pci_dev *bridge = bus->self;
312
313 if (bridge->pme_interrupt)
314 return;
315 if (!acpi_dev_run_wake(&bridge->dev, enable))
316 return;
317 bus = bus->parent;
318 }
319
320 /* We have reached the root bus. */
321 if (bus->bridge)
322 acpi_dev_run_wake(bus->bridge, enable);
323}
324
325static int acpi_pci_run_wake(struct pci_dev *dev, bool enable)
326{
327 if (dev->pme_interrupt)
328 return 0;
329
330 if (!acpi_dev_run_wake(&dev->dev, enable))
331 return 0;
332
333 acpi_pci_propagate_run_wake(dev->bus, enable);
334 return 0;
335}
336
337static struct pci_platform_pm_ops acpi_pci_platform_pm = {
338 .is_manageable = acpi_pci_power_manageable,
339 .set_state = acpi_pci_set_power_state,
340 .choose_state = acpi_pci_choose_state,
341 .can_wakeup = acpi_pci_can_wakeup,
342 .sleep_wake = acpi_pci_sleep_wake,
343 .run_wake = acpi_pci_run_wake,
344};
345
346/* ACPI bus type */
347static int acpi_pci_find_device(struct device *dev, acpi_handle *handle)
348{
349 struct pci_dev * pci_dev;
350 u64 addr;
351
352 pci_dev = to_pci_dev(dev);
353 /* Please ref to ACPI spec for the syntax of _ADR */
354 addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
355 *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);
356 if (!*handle)
357 return -ENODEV;
358 return 0;
359}
360
361static int acpi_pci_find_root_bridge(struct device *dev, acpi_handle *handle)
362{
363 int num;
364 unsigned int seg, bus;
365
366 /*
367 * The string should be the same as root bridge's name
368 * Please look at 'pci_scan_bus_parented'
369 */
370 num = sscanf(dev_name(dev), "pci%04x:%02x", &seg, &bus);
371 if (num != 2)
372 return -ENODEV;
373 *handle = acpi_get_pci_rootbridge_handle(seg, bus);
374 if (!*handle)
375 return -ENODEV;
376 return 0;
377}
378
379static struct acpi_bus_type acpi_pci_bus = {
380 .bus = &pci_bus_type,
381 .find_device = acpi_pci_find_device,
382 .find_bridge = acpi_pci_find_root_bridge,
383};
384
385static int __init acpi_pci_init(void)
386{
387 int ret;
388
389 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_MSI) {
390 printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n");
391 pci_no_msi();
392 }
393
394 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
395 printk(KERN_INFO"ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n");
396 pcie_clear_aspm();
397 pcie_no_aspm();
398 }
399
400 ret = register_acpi_bus_type(&acpi_pci_bus);
401 if (ret)
402 return 0;
403 pci_set_platform_pm(&acpi_pci_platform_pm);
404 return 0;
405}
406arch_initcall(acpi_pci_init);
1/*
2 * File: pci-acpi.c
3 * Purpose: Provide PCI support in ACPI
4 *
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.
8 */
9
10#include <linux/delay.h>
11#include <linux/init.h>
12#include <linux/pci.h>
13#include <linux/module.h>
14#include <linux/pci-aspm.h>
15#include <acpi/acpi.h>
16#include <acpi/acpi_bus.h>
17
18#include <linux/pci-acpi.h>
19#include <linux/pm_runtime.h>
20#include "pci.h"
21
22static 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 */
30static 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 */
44static 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)
49 return;
50
51 if (!pci_dev->pm_cap || !pci_dev->pme_support
52 || pci_check_pme_status(pci_dev)) {
53 if (pci_dev->pme_poll)
54 pci_dev->pme_poll = false;
55
56 pci_wakeup_event(pci_dev);
57 pm_runtime_resume(&pci_dev->dev);
58 }
59
60 if (pci_dev->subordinate)
61 pci_pme_wakeup_bus(pci_dev->subordinate);
62}
63
64/**
65 * add_pm_notifier - Register PM notifier for given ACPI device.
66 * @dev: ACPI device to add the notifier for.
67 * @context: PCI device or bus to check for PME status if an event is signaled.
68 *
69 * NOTE: @dev need not be a run-wake or wake-up device to be a valid source of
70 * PM wake-up events. For example, wake-up events may be generated for bridges
71 * if one of the devices below the bridge is signaling PME, even if the bridge
72 * itself doesn't have a wake-up GPE associated with it.
73 */
74static acpi_status add_pm_notifier(struct acpi_device *dev,
75 acpi_notify_handler handler,
76 void *context)
77{
78 acpi_status status = AE_ALREADY_EXISTS;
79
80 mutex_lock(&pci_acpi_pm_notify_mtx);
81
82 if (dev->wakeup.flags.notifier_present)
83 goto out;
84
85 status = acpi_install_notify_handler(dev->handle,
86 ACPI_SYSTEM_NOTIFY,
87 handler, context);
88 if (ACPI_FAILURE(status))
89 goto out;
90
91 dev->wakeup.flags.notifier_present = true;
92
93 out:
94 mutex_unlock(&pci_acpi_pm_notify_mtx);
95 return status;
96}
97
98/**
99 * remove_pm_notifier - Unregister PM notifier from given ACPI device.
100 * @dev: ACPI device to remove the notifier from.
101 */
102static acpi_status remove_pm_notifier(struct acpi_device *dev,
103 acpi_notify_handler handler)
104{
105 acpi_status status = AE_BAD_PARAMETER;
106
107 mutex_lock(&pci_acpi_pm_notify_mtx);
108
109 if (!dev->wakeup.flags.notifier_present)
110 goto out;
111
112 status = acpi_remove_notify_handler(dev->handle,
113 ACPI_SYSTEM_NOTIFY,
114 handler);
115 if (ACPI_FAILURE(status))
116 goto out;
117
118 dev->wakeup.flags.notifier_present = false;
119
120 out:
121 mutex_unlock(&pci_acpi_pm_notify_mtx);
122 return status;
123}
124
125/**
126 * pci_acpi_add_bus_pm_notifier - Register PM notifier for given PCI bus.
127 * @dev: ACPI device to add the notifier for.
128 * @pci_bus: PCI bus to walk checking for PME status if an event is signaled.
129 */
130acpi_status pci_acpi_add_bus_pm_notifier(struct acpi_device *dev,
131 struct pci_bus *pci_bus)
132{
133 return add_pm_notifier(dev, pci_acpi_wake_bus, pci_bus);
134}
135
136/**
137 * pci_acpi_remove_bus_pm_notifier - Unregister PCI bus PM notifier.
138 * @dev: ACPI device to remove the notifier from.
139 */
140acpi_status pci_acpi_remove_bus_pm_notifier(struct acpi_device *dev)
141{
142 return remove_pm_notifier(dev, pci_acpi_wake_bus);
143}
144
145/**
146 * pci_acpi_add_pm_notifier - Register PM notifier for given PCI device.
147 * @dev: ACPI device to add the notifier for.
148 * @pci_dev: PCI device to check for the PME status if an event is signaled.
149 */
150acpi_status pci_acpi_add_pm_notifier(struct acpi_device *dev,
151 struct pci_dev *pci_dev)
152{
153 return add_pm_notifier(dev, pci_acpi_wake_dev, pci_dev);
154}
155
156/**
157 * pci_acpi_remove_pm_notifier - Unregister PCI device PM notifier.
158 * @dev: ACPI device to remove the notifier from.
159 */
160acpi_status pci_acpi_remove_pm_notifier(struct acpi_device *dev)
161{
162 return remove_pm_notifier(dev, pci_acpi_wake_dev);
163}
164
165/*
166 * _SxD returns the D-state with the highest power
167 * (lowest D-state number) supported in the S-state "x".
168 *
169 * If the devices does not have a _PRW
170 * (Power Resources for Wake) supporting system wakeup from "x"
171 * then the OS is free to choose a lower power (higher number
172 * D-state) than the return value from _SxD.
173 *
174 * But if _PRW is enabled at S-state "x", the OS
175 * must not choose a power lower than _SxD --
176 * unless the device has an _SxW method specifying
177 * the lowest power (highest D-state number) the device
178 * may enter while still able to wake the system.
179 *
180 * ie. depending on global OS policy:
181 *
182 * if (_PRW at S-state x)
183 * choose from highest power _SxD to lowest power _SxW
184 * else // no _PRW at S-state x
185 * choose highest power _SxD or any lower power
186 */
187
188static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
189{
190 int acpi_state;
191
192 acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL);
193 if (acpi_state < 0)
194 return PCI_POWER_ERROR;
195
196 switch (acpi_state) {
197 case ACPI_STATE_D0:
198 return PCI_D0;
199 case ACPI_STATE_D1:
200 return PCI_D1;
201 case ACPI_STATE_D2:
202 return PCI_D2;
203 case ACPI_STATE_D3_HOT:
204 return PCI_D3hot;
205 case ACPI_STATE_D3_COLD:
206 return PCI_D3cold;
207 }
208 return PCI_POWER_ERROR;
209}
210
211static bool acpi_pci_power_manageable(struct pci_dev *dev)
212{
213 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
214
215 return handle ? acpi_bus_power_manageable(handle) : false;
216}
217
218static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
219{
220 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
221 acpi_handle tmp;
222 static const u8 state_conv[] = {
223 [PCI_D0] = ACPI_STATE_D0,
224 [PCI_D1] = ACPI_STATE_D1,
225 [PCI_D2] = ACPI_STATE_D2,
226 [PCI_D3hot] = ACPI_STATE_D3,
227 [PCI_D3cold] = ACPI_STATE_D3
228 };
229 int error = -EINVAL;
230
231 /* If the ACPI device has _EJ0, ignore the device */
232 if (!handle || ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
233 return -ENODEV;
234
235 switch (state) {
236 case PCI_D0:
237 case PCI_D1:
238 case PCI_D2:
239 case PCI_D3hot:
240 case PCI_D3cold:
241 error = acpi_bus_set_power(handle, state_conv[state]);
242 }
243
244 if (!error)
245 dev_printk(KERN_INFO, &dev->dev,
246 "power state changed by ACPI to D%d\n", state);
247
248 return error;
249}
250
251static bool acpi_pci_can_wakeup(struct pci_dev *dev)
252{
253 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
254
255 return handle ? acpi_bus_can_wakeup(handle) : false;
256}
257
258static void acpi_pci_propagate_wakeup_enable(struct pci_bus *bus, bool enable)
259{
260 while (bus->parent) {
261 if (!acpi_pm_device_sleep_wake(&bus->self->dev, enable))
262 return;
263 bus = bus->parent;
264 }
265
266 /* We have reached the root bus. */
267 if (bus->bridge)
268 acpi_pm_device_sleep_wake(bus->bridge, enable);
269}
270
271static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable)
272{
273 if (acpi_pci_can_wakeup(dev))
274 return acpi_pm_device_sleep_wake(&dev->dev, enable);
275
276 acpi_pci_propagate_wakeup_enable(dev->bus, enable);
277 return 0;
278}
279
280static void acpi_pci_propagate_run_wake(struct pci_bus *bus, bool enable)
281{
282 while (bus->parent) {
283 struct pci_dev *bridge = bus->self;
284
285 if (bridge->pme_interrupt)
286 return;
287 if (!acpi_pm_device_run_wake(&bridge->dev, enable))
288 return;
289 bus = bus->parent;
290 }
291
292 /* We have reached the root bus. */
293 if (bus->bridge)
294 acpi_pm_device_run_wake(bus->bridge, enable);
295}
296
297static int acpi_pci_run_wake(struct pci_dev *dev, bool enable)
298{
299 if (dev->pme_interrupt)
300 return 0;
301
302 if (!acpi_pm_device_run_wake(&dev->dev, enable))
303 return 0;
304
305 acpi_pci_propagate_run_wake(dev->bus, enable);
306 return 0;
307}
308
309static struct pci_platform_pm_ops acpi_pci_platform_pm = {
310 .is_manageable = acpi_pci_power_manageable,
311 .set_state = acpi_pci_set_power_state,
312 .choose_state = acpi_pci_choose_state,
313 .can_wakeup = acpi_pci_can_wakeup,
314 .sleep_wake = acpi_pci_sleep_wake,
315 .run_wake = acpi_pci_run_wake,
316};
317
318/* ACPI bus type */
319static int acpi_pci_find_device(struct device *dev, acpi_handle *handle)
320{
321 struct pci_dev * pci_dev;
322 u64 addr;
323
324 pci_dev = to_pci_dev(dev);
325 /* Please ref to ACPI spec for the syntax of _ADR */
326 addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
327 *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);
328 if (!*handle)
329 return -ENODEV;
330 return 0;
331}
332
333static int acpi_pci_find_root_bridge(struct device *dev, acpi_handle *handle)
334{
335 int num;
336 unsigned int seg, bus;
337
338 /*
339 * The string should be the same as root bridge's name
340 * Please look at 'pci_scan_bus_parented'
341 */
342 num = sscanf(dev_name(dev), "pci%04x:%02x", &seg, &bus);
343 if (num != 2)
344 return -ENODEV;
345 *handle = acpi_get_pci_rootbridge_handle(seg, bus);
346 if (!*handle)
347 return -ENODEV;
348 return 0;
349}
350
351static struct acpi_bus_type acpi_pci_bus = {
352 .bus = &pci_bus_type,
353 .find_device = acpi_pci_find_device,
354 .find_bridge = acpi_pci_find_root_bridge,
355};
356
357static int __init acpi_pci_init(void)
358{
359 int ret;
360
361 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_MSI) {
362 printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n");
363 pci_no_msi();
364 }
365
366 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
367 printk(KERN_INFO"ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n");
368 pcie_no_aspm();
369 }
370
371 ret = register_acpi_bus_type(&acpi_pci_bus);
372 if (ret)
373 return 0;
374 pci_set_platform_pm(&acpi_pci_platform_pm);
375 return 0;
376}
377arch_initcall(acpi_pci_init);