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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * File: pci-acpi.c | |
a406d9e6 | 3 | * Purpose: Provide PCI support in ACPI |
1da177e4 | 4 | * |
84df749f DSL |
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. | |
1da177e4 LT |
8 | */ |
9 | ||
10 | #include <linux/delay.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/pci.h> | |
13 | #include <linux/module.h> | |
5fde244d | 14 | #include <linux/pci-aspm.h> |
1da177e4 | 15 | #include <acpi/acpi.h> |
1da177e4 LT |
16 | #include <acpi/acpi_bus.h> |
17 | ||
18 | #include <linux/pci-acpi.h> | |
b67ea761 | 19 | #include <linux/pm_runtime.h> |
0f64474b | 20 | #include "pci.h" |
1da177e4 | 21 | |
b67ea761 RW |
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) { | |
0f953bf6 | 49 | pci_wakeup_event(pci_dev); |
b67ea761 RW |
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 | ||
0f64474b DSL |
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 | |
0f64474b DSL |
179 | */ |
180 | ||
8d2bdf49 | 181 | static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev) |
0f64474b | 182 | { |
ab826ca4 | 183 | int acpi_state; |
0f64474b | 184 | |
06166780 | 185 | acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL); |
ab826ca4 SL |
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; | |
0f64474b | 200 | } |
961d9120 RW |
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 | } | |
0f64474b | 208 | |
b913100d DSL |
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); | |
10b3dcae | 212 | acpi_handle tmp; |
583c377f DB |
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 | |
b913100d | 219 | }; |
44e4e66e | 220 | int error = -EINVAL; |
b913100d | 221 | |
10b3dcae | 222 | /* If the ACPI device has _EJ0, ignore the device */ |
44e4e66e RW |
223 | if (!handle || ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp))) |
224 | return -ENODEV; | |
583c377f DB |
225 | |
226 | switch (state) { | |
227 | case PCI_D0: | |
228 | case PCI_D1: | |
229 | case PCI_D2: | |
230 | case PCI_D3hot: | |
231 | case PCI_D3cold: | |
44e4e66e | 232 | error = acpi_bus_set_power(handle, state_conv[state]); |
583c377f | 233 | } |
44e4e66e RW |
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; | |
b913100d DSL |
240 | } |
241 | ||
eb9d0fe4 RW |
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 | ||
0baed8da RW |
249 | static void acpi_pci_propagate_wakeup_enable(struct pci_bus *bus, bool enable) |
250 | { | |
251 | while (bus->parent) { | |
dc1a94ae | 252 | if (!acpi_pm_device_sleep_wake(&bus->self->dev, enable)) |
0baed8da RW |
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 | ||
eb9d0fe4 RW |
262 | static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable) |
263 | { | |
0baed8da RW |
264 | if (acpi_pci_can_wakeup(dev)) |
265 | return acpi_pm_device_sleep_wake(&dev->dev, enable); | |
266 | ||
dc1a94ae | 267 | acpi_pci_propagate_wakeup_enable(dev->bus, enable); |
0baed8da | 268 | return 0; |
eb9d0fe4 RW |
269 | } |
270 | ||
b67ea761 RW |
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, | |
a44061aa | 299 | dev->wakeup.gpe_number); |
b67ea761 RW |
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, | |
a44061aa | 304 | dev->wakeup.gpe_number); |
b67ea761 RW |
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 | ||
961d9120 RW |
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, | |
eb9d0fe4 RW |
347 | .can_wakeup = acpi_pci_can_wakeup, |
348 | .sleep_wake = acpi_pci_sleep_wake, | |
b67ea761 | 349 | .run_wake = acpi_pci_run_wake, |
961d9120 | 350 | }; |
b913100d | 351 | |
84df749f | 352 | /* ACPI bus type */ |
9c273b95 | 353 | static int acpi_pci_find_device(struct device *dev, acpi_handle *handle) |
84df749f DSL |
354 | { |
355 | struct pci_dev * pci_dev; | |
439913ff | 356 | u64 addr; |
84df749f DSL |
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 | ||
9c273b95 | 367 | static int acpi_pci_find_root_bridge(struct device *dev, acpi_handle *handle) |
84df749f DSL |
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 | */ | |
1a927133 | 376 | num = sscanf(dev_name(dev), "pci%04x:%02x", &seg, &bus); |
84df749f DSL |
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 | ||
9c273b95 | 385 | static struct acpi_bus_type acpi_pci_bus = { |
84df749f | 386 | .bus = &pci_bus_type, |
9c273b95 MK |
387 | .find_device = acpi_pci_find_device, |
388 | .find_bridge = acpi_pci_find_root_bridge, | |
84df749f DSL |
389 | }; |
390 | ||
9c273b95 | 391 | static int __init acpi_pci_init(void) |
84df749f DSL |
392 | { |
393 | int ret; | |
394 | ||
993958fe | 395 | if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_MSI) { |
f8993aff SL |
396 | printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n"); |
397 | pci_no_msi(); | |
398 | } | |
5fde244d | 399 | |
993958fe | 400 | if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) { |
5fde244d | 401 | printk(KERN_INFO"ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n"); |
2f671e2d | 402 | pcie_clear_aspm(); |
5fde244d SL |
403 | pcie_no_aspm(); |
404 | } | |
405 | ||
9c273b95 | 406 | ret = register_acpi_bus_type(&acpi_pci_bus); |
84df749f DSL |
407 | if (ret) |
408 | return 0; | |
961d9120 | 409 | pci_set_platform_pm(&acpi_pci_platform_pm); |
84df749f DSL |
410 | return 0; |
411 | } | |
9c273b95 | 412 | arch_initcall(acpi_pci_init); |