Commit | Line | Data |
---|---|---|
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 <linux/pci-acpi.h> |
b67ea761 | 16 | #include <linux/pm_runtime.h> |
8b713a88 | 17 | #include <linux/pm_qos.h> |
0f64474b | 18 | #include "pci.h" |
1da177e4 | 19 | |
b67ea761 RW |
20 | /** |
21 | * pci_acpi_wake_bus - Wake-up notification handler for root buses. | |
22 | * @handle: ACPI handle of a device the notification is for. | |
23 | * @event: Type of the signaled event. | |
24 | * @context: PCI root bus to wake up devices on. | |
25 | */ | |
26 | static void pci_acpi_wake_bus(acpi_handle handle, u32 event, void *context) | |
27 | { | |
28 | struct pci_bus *pci_bus = context; | |
29 | ||
30 | if (event == ACPI_NOTIFY_DEVICE_WAKE && pci_bus) | |
31 | pci_pme_wakeup_bus(pci_bus); | |
32 | } | |
33 | ||
34 | /** | |
35 | * pci_acpi_wake_dev - Wake-up notification handler for PCI devices. | |
36 | * @handle: ACPI handle of a device the notification is for. | |
37 | * @event: Type of the signaled event. | |
38 | * @context: PCI device object to wake up. | |
39 | */ | |
40 | static void pci_acpi_wake_dev(acpi_handle handle, u32 event, void *context) | |
41 | { | |
42 | struct pci_dev *pci_dev = context; | |
43 | ||
a424948d RW |
44 | if (event != ACPI_NOTIFY_DEVICE_WAKE || !pci_dev) |
45 | return; | |
46 | ||
83414515 RW |
47 | if (pci_dev->pme_poll) |
48 | pci_dev->pme_poll = false; | |
49 | ||
448bd857 HY |
50 | if (pci_dev->current_state == PCI_D3cold) { |
51 | pci_wakeup_event(pci_dev); | |
52 | pm_runtime_resume(&pci_dev->dev); | |
53 | return; | |
54 | } | |
55 | ||
24ad0ef9 RW |
56 | /* Clear PME Status if set. */ |
57 | if (pci_dev->pme_support) | |
58 | pci_check_pme_status(pci_dev); | |
379021d5 | 59 | |
24ad0ef9 RW |
60 | pci_wakeup_event(pci_dev); |
61 | pm_runtime_resume(&pci_dev->dev); | |
a424948d RW |
62 | |
63 | if (pci_dev->subordinate) | |
64 | pci_pme_wakeup_bus(pci_dev->subordinate); | |
b67ea761 RW |
65 | } |
66 | ||
b67ea761 RW |
67 | /** |
68 | * pci_acpi_add_bus_pm_notifier - Register PM notifier for given PCI bus. | |
69 | * @dev: ACPI device to add the notifier for. | |
70 | * @pci_bus: PCI bus to walk checking for PME status if an event is signaled. | |
71 | */ | |
72 | acpi_status pci_acpi_add_bus_pm_notifier(struct acpi_device *dev, | |
73 | struct pci_bus *pci_bus) | |
74 | { | |
ec2cd81c | 75 | return acpi_add_pm_notifier(dev, pci_acpi_wake_bus, pci_bus); |
b67ea761 RW |
76 | } |
77 | ||
78 | /** | |
79 | * pci_acpi_remove_bus_pm_notifier - Unregister PCI bus PM notifier. | |
80 | * @dev: ACPI device to remove the notifier from. | |
81 | */ | |
82 | acpi_status pci_acpi_remove_bus_pm_notifier(struct acpi_device *dev) | |
83 | { | |
ec2cd81c | 84 | return acpi_remove_pm_notifier(dev, pci_acpi_wake_bus); |
b67ea761 RW |
85 | } |
86 | ||
87 | /** | |
88 | * pci_acpi_add_pm_notifier - Register PM notifier for given PCI device. | |
89 | * @dev: ACPI device to add the notifier for. | |
90 | * @pci_dev: PCI device to check for the PME status if an event is signaled. | |
91 | */ | |
92 | acpi_status pci_acpi_add_pm_notifier(struct acpi_device *dev, | |
93 | struct pci_dev *pci_dev) | |
94 | { | |
ec2cd81c | 95 | return acpi_add_pm_notifier(dev, pci_acpi_wake_dev, pci_dev); |
b67ea761 RW |
96 | } |
97 | ||
98 | /** | |
99 | * pci_acpi_remove_pm_notifier - Unregister PCI device PM notifier. | |
100 | * @dev: ACPI device to remove the notifier from. | |
101 | */ | |
102 | acpi_status pci_acpi_remove_pm_notifier(struct acpi_device *dev) | |
103 | { | |
ec2cd81c | 104 | return acpi_remove_pm_notifier(dev, pci_acpi_wake_dev); |
b67ea761 RW |
105 | } |
106 | ||
f4b57a3b JL |
107 | phys_addr_t acpi_pci_root_get_mcfg_addr(acpi_handle handle) |
108 | { | |
109 | acpi_status status = AE_NOT_EXIST; | |
110 | unsigned long long mcfg_addr; | |
111 | ||
112 | if (handle) | |
113 | status = acpi_evaluate_integer(handle, METHOD_NAME__CBA, | |
114 | NULL, &mcfg_addr); | |
115 | if (ACPI_FAILURE(status)) | |
116 | return 0; | |
117 | ||
118 | return (phys_addr_t)mcfg_addr; | |
119 | } | |
120 | ||
0f64474b DSL |
121 | /* |
122 | * _SxD returns the D-state with the highest power | |
123 | * (lowest D-state number) supported in the S-state "x". | |
124 | * | |
125 | * If the devices does not have a _PRW | |
126 | * (Power Resources for Wake) supporting system wakeup from "x" | |
127 | * then the OS is free to choose a lower power (higher number | |
128 | * D-state) than the return value from _SxD. | |
129 | * | |
130 | * But if _PRW is enabled at S-state "x", the OS | |
131 | * must not choose a power lower than _SxD -- | |
132 | * unless the device has an _SxW method specifying | |
133 | * the lowest power (highest D-state number) the device | |
134 | * may enter while still able to wake the system. | |
135 | * | |
136 | * ie. depending on global OS policy: | |
137 | * | |
138 | * if (_PRW at S-state x) | |
139 | * choose from highest power _SxD to lowest power _SxW | |
140 | * else // no _PRW at S-state x | |
f7625980 | 141 | * choose highest power _SxD or any lower power |
0f64474b DSL |
142 | */ |
143 | ||
8d2bdf49 | 144 | static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev) |
0f64474b | 145 | { |
448bd857 | 146 | int acpi_state, d_max; |
0f64474b | 147 | |
448bd857 HY |
148 | if (pdev->no_d3cold) |
149 | d_max = ACPI_STATE_D3_HOT; | |
150 | else | |
151 | d_max = ACPI_STATE_D3_COLD; | |
152 | acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL, d_max); | |
ab826ca4 SL |
153 | if (acpi_state < 0) |
154 | return PCI_POWER_ERROR; | |
155 | ||
156 | switch (acpi_state) { | |
157 | case ACPI_STATE_D0: | |
158 | return PCI_D0; | |
159 | case ACPI_STATE_D1: | |
160 | return PCI_D1; | |
161 | case ACPI_STATE_D2: | |
162 | return PCI_D2; | |
1cc0c998 | 163 | case ACPI_STATE_D3_HOT: |
ab826ca4 | 164 | return PCI_D3hot; |
28c2103d LM |
165 | case ACPI_STATE_D3_COLD: |
166 | return PCI_D3cold; | |
ab826ca4 SL |
167 | } |
168 | return PCI_POWER_ERROR; | |
0f64474b | 169 | } |
961d9120 RW |
170 | |
171 | static bool acpi_pci_power_manageable(struct pci_dev *dev) | |
172 | { | |
3a83f992 | 173 | acpi_handle handle = ACPI_HANDLE(&dev->dev); |
961d9120 RW |
174 | |
175 | return handle ? acpi_bus_power_manageable(handle) : false; | |
176 | } | |
0f64474b | 177 | |
b913100d DSL |
178 | static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state) |
179 | { | |
3a83f992 | 180 | acpi_handle handle = ACPI_HANDLE(&dev->dev); |
583c377f DB |
181 | static const u8 state_conv[] = { |
182 | [PCI_D0] = ACPI_STATE_D0, | |
183 | [PCI_D1] = ACPI_STATE_D1, | |
184 | [PCI_D2] = ACPI_STATE_D2, | |
fc6504b3 RW |
185 | [PCI_D3hot] = ACPI_STATE_D3_COLD, |
186 | [PCI_D3cold] = ACPI_STATE_D3_COLD, | |
b913100d | 187 | }; |
44e4e66e | 188 | int error = -EINVAL; |
b913100d | 189 | |
10b3dcae | 190 | /* If the ACPI device has _EJ0, ignore the device */ |
be07c00e | 191 | if (!handle || acpi_has_method(handle, "_EJ0")) |
44e4e66e | 192 | return -ENODEV; |
583c377f DB |
193 | |
194 | switch (state) { | |
8b713a88 RW |
195 | case PCI_D3cold: |
196 | if (dev_pm_qos_flags(&dev->dev, PM_QOS_FLAG_NO_POWER_OFF) == | |
197 | PM_QOS_FLAGS_ALL) { | |
198 | error = -EBUSY; | |
199 | break; | |
200 | } | |
583c377f DB |
201 | case PCI_D0: |
202 | case PCI_D1: | |
203 | case PCI_D2: | |
204 | case PCI_D3hot: | |
44e4e66e | 205 | error = acpi_bus_set_power(handle, state_conv[state]); |
583c377f | 206 | } |
44e4e66e RW |
207 | |
208 | if (!error) | |
d010e576 | 209 | dev_dbg(&dev->dev, "power state changed by ACPI to %s\n", |
fc6504b3 | 210 | acpi_power_state_string(state_conv[state])); |
44e4e66e RW |
211 | |
212 | return error; | |
b913100d DSL |
213 | } |
214 | ||
eb9d0fe4 RW |
215 | static bool acpi_pci_can_wakeup(struct pci_dev *dev) |
216 | { | |
3a83f992 | 217 | acpi_handle handle = ACPI_HANDLE(&dev->dev); |
eb9d0fe4 RW |
218 | |
219 | return handle ? acpi_bus_can_wakeup(handle) : false; | |
220 | } | |
221 | ||
0baed8da RW |
222 | static void acpi_pci_propagate_wakeup_enable(struct pci_bus *bus, bool enable) |
223 | { | |
224 | while (bus->parent) { | |
dc1a94ae | 225 | if (!acpi_pm_device_sleep_wake(&bus->self->dev, enable)) |
0baed8da RW |
226 | return; |
227 | bus = bus->parent; | |
228 | } | |
229 | ||
230 | /* We have reached the root bus. */ | |
231 | if (bus->bridge) | |
232 | acpi_pm_device_sleep_wake(bus->bridge, enable); | |
233 | } | |
234 | ||
eb9d0fe4 RW |
235 | static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable) |
236 | { | |
0baed8da RW |
237 | if (acpi_pci_can_wakeup(dev)) |
238 | return acpi_pm_device_sleep_wake(&dev->dev, enable); | |
239 | ||
dc1a94ae | 240 | acpi_pci_propagate_wakeup_enable(dev->bus, enable); |
0baed8da | 241 | return 0; |
eb9d0fe4 RW |
242 | } |
243 | ||
b67ea761 RW |
244 | static void acpi_pci_propagate_run_wake(struct pci_bus *bus, bool enable) |
245 | { | |
246 | while (bus->parent) { | |
247 | struct pci_dev *bridge = bus->self; | |
248 | ||
249 | if (bridge->pme_interrupt) | |
250 | return; | |
b24e5098 | 251 | if (!acpi_pm_device_run_wake(&bridge->dev, enable)) |
b67ea761 RW |
252 | return; |
253 | bus = bus->parent; | |
254 | } | |
255 | ||
256 | /* We have reached the root bus. */ | |
257 | if (bus->bridge) | |
b24e5098 | 258 | acpi_pm_device_run_wake(bus->bridge, enable); |
b67ea761 RW |
259 | } |
260 | ||
261 | static int acpi_pci_run_wake(struct pci_dev *dev, bool enable) | |
262 | { | |
448bd857 HY |
263 | /* |
264 | * Per PCI Express Base Specification Revision 2.0 section | |
265 | * 5.3.3.2 Link Wakeup, platform support is needed for D3cold | |
266 | * waking up to power on the main link even if there is PME | |
267 | * support for D3cold | |
268 | */ | |
269 | if (dev->pme_interrupt && !dev->runtime_d3cold) | |
b67ea761 RW |
270 | return 0; |
271 | ||
b24e5098 | 272 | if (!acpi_pm_device_run_wake(&dev->dev, enable)) |
b67ea761 RW |
273 | return 0; |
274 | ||
275 | acpi_pci_propagate_run_wake(dev->bus, enable); | |
276 | return 0; | |
277 | } | |
278 | ||
961d9120 RW |
279 | static struct pci_platform_pm_ops acpi_pci_platform_pm = { |
280 | .is_manageable = acpi_pci_power_manageable, | |
281 | .set_state = acpi_pci_set_power_state, | |
282 | .choose_state = acpi_pci_choose_state, | |
eb9d0fe4 | 283 | .sleep_wake = acpi_pci_sleep_wake, |
b67ea761 | 284 | .run_wake = acpi_pci_run_wake, |
961d9120 | 285 | }; |
b913100d | 286 | |
5090d4a6 JL |
287 | void acpi_pci_add_bus(struct pci_bus *bus) |
288 | { | |
be1c9de9 | 289 | if (acpi_pci_disabled || !bus->bridge) |
5090d4a6 JL |
290 | return; |
291 | ||
be1c9de9 RW |
292 | acpi_pci_slot_enumerate(bus); |
293 | acpiphp_enumerate_slots(bus); | |
5090d4a6 JL |
294 | } |
295 | ||
296 | void acpi_pci_remove_bus(struct pci_bus *bus) | |
297 | { | |
be1c9de9 | 298 | if (acpi_pci_disabled || !bus->bridge) |
5090d4a6 JL |
299 | return; |
300 | ||
3b63aaa7 | 301 | acpiphp_remove_slots(bus); |
5c0b04e3 | 302 | acpi_pci_slot_remove(bus); |
5090d4a6 JL |
303 | } |
304 | ||
84df749f | 305 | /* ACPI bus type */ |
9c273b95 | 306 | static int acpi_pci_find_device(struct device *dev, acpi_handle *handle) |
84df749f | 307 | { |
60f75b8e | 308 | struct pci_dev *pci_dev = to_pci_dev(dev); |
5ce79d20 RW |
309 | struct acpi_device *adev; |
310 | bool check_children; | |
60f75b8e | 311 | u64 addr; |
84df749f | 312 | |
60f75b8e RW |
313 | /* |
314 | * pci_is_bridge() is not suitable here, because pci_dev->subordinate | |
315 | * is set only after acpi_pci_find_device() has been called for the | |
316 | * given device. | |
317 | */ | |
5ce79d20 | 318 | check_children = pci_dev->hdr_type == PCI_HEADER_TYPE_BRIDGE |
60f75b8e | 319 | || pci_dev->hdr_type == PCI_HEADER_TYPE_CARDBUS; |
84df749f DSL |
320 | /* Please ref to ACPI spec for the syntax of _ADR */ |
321 | addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn); | |
5ce79d20 RW |
322 | adev = acpi_find_child_device(ACPI_COMPANION(dev->parent), addr, |
323 | check_children); | |
324 | if (adev) { | |
325 | *handle = adev->handle; | |
326 | return 0; | |
327 | } | |
328 | return -ENODEV; | |
84df749f DSL |
329 | } |
330 | ||
38a9a67a | 331 | static void pci_acpi_setup(struct device *dev) |
d2e5f0c1 | 332 | { |
d2e5f0c1 | 333 | struct pci_dev *pci_dev = to_pci_dev(dev); |
38a9a67a RW |
334 | acpi_handle handle = ACPI_HANDLE(dev); |
335 | struct acpi_device *adev; | |
38a9a67a | 336 | |
38a9a67a | 337 | if (acpi_bus_get_device(handle, &adev) || !adev->wakeup.flags.valid) |
d2e5f0c1 RW |
338 | return; |
339 | ||
340 | device_set_wakeup_capable(dev, true); | |
341 | acpi_pci_sleep_wake(pci_dev, false); | |
342 | ||
343 | pci_acpi_add_pm_notifier(adev, pci_dev); | |
344 | if (adev->wakeup.flags.run_wake) | |
345 | device_set_run_wake(dev, true); | |
346 | } | |
347 | ||
38a9a67a | 348 | static void pci_acpi_cleanup(struct device *dev) |
d2e5f0c1 | 349 | { |
38a9a67a RW |
350 | acpi_handle handle = ACPI_HANDLE(dev); |
351 | struct acpi_device *adev; | |
d2e5f0c1 | 352 | |
38a9a67a | 353 | if (!acpi_bus_get_device(handle, &adev) && adev->wakeup.flags.valid) { |
d2e5f0c1 RW |
354 | device_set_wakeup_capable(dev, false); |
355 | device_set_run_wake(dev, false); | |
356 | pci_acpi_remove_pm_notifier(adev); | |
357 | } | |
358 | } | |
359 | ||
53540098 RW |
360 | static bool pci_acpi_bus_match(struct device *dev) |
361 | { | |
362 | return dev->bus == &pci_bus_type; | |
363 | } | |
364 | ||
9c273b95 | 365 | static struct acpi_bus_type acpi_pci_bus = { |
53540098 RW |
366 | .name = "PCI", |
367 | .match = pci_acpi_bus_match, | |
9c273b95 | 368 | .find_device = acpi_pci_find_device, |
38a9a67a RW |
369 | .setup = pci_acpi_setup, |
370 | .cleanup = pci_acpi_cleanup, | |
84df749f DSL |
371 | }; |
372 | ||
9c273b95 | 373 | static int __init acpi_pci_init(void) |
84df749f DSL |
374 | { |
375 | int ret; | |
376 | ||
993958fe | 377 | if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_MSI) { |
e7d45152 | 378 | pr_info("ACPI FADT declares the system doesn't support MSI, so disable it\n"); |
f8993aff SL |
379 | pci_no_msi(); |
380 | } | |
5fde244d | 381 | |
993958fe | 382 | if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) { |
e7d45152 | 383 | pr_info("ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n"); |
5fde244d SL |
384 | pcie_no_aspm(); |
385 | } | |
386 | ||
9c273b95 | 387 | ret = register_acpi_bus_type(&acpi_pci_bus); |
84df749f DSL |
388 | if (ret) |
389 | return 0; | |
5c0b04e3 | 390 | |
961d9120 | 391 | pci_set_platform_pm(&acpi_pci_platform_pm); |
5c0b04e3 | 392 | acpi_pci_slot_init(); |
3b63aaa7 | 393 | acpiphp_init(); |
5c0b04e3 | 394 | |
84df749f DSL |
395 | return 0; |
396 | } | |
9c273b95 | 397 | arch_initcall(acpi_pci_init); |