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 <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> |
8b713a88 | 20 | #include <linux/pm_qos.h> |
0f64474b | 21 | #include "pci.h" |
1da177e4 | 22 | |
b67ea761 RW |
23 | /** |
24 | * pci_acpi_wake_bus - Wake-up notification handler for root buses. | |
25 | * @handle: ACPI handle of a device the notification is for. | |
26 | * @event: Type of the signaled event. | |
27 | * @context: PCI root bus to wake up devices on. | |
28 | */ | |
29 | static void pci_acpi_wake_bus(acpi_handle handle, u32 event, void *context) | |
30 | { | |
31 | struct pci_bus *pci_bus = context; | |
32 | ||
33 | if (event == ACPI_NOTIFY_DEVICE_WAKE && pci_bus) | |
34 | pci_pme_wakeup_bus(pci_bus); | |
35 | } | |
36 | ||
37 | /** | |
38 | * pci_acpi_wake_dev - Wake-up notification handler for PCI devices. | |
39 | * @handle: ACPI handle of a device the notification is for. | |
40 | * @event: Type of the signaled event. | |
41 | * @context: PCI device object to wake up. | |
42 | */ | |
43 | static void pci_acpi_wake_dev(acpi_handle handle, u32 event, void *context) | |
44 | { | |
45 | struct pci_dev *pci_dev = context; | |
46 | ||
a424948d RW |
47 | if (event != ACPI_NOTIFY_DEVICE_WAKE || !pci_dev) |
48 | return; | |
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 | if (pci_dev->pme_poll) |
61 | pci_dev->pme_poll = false; | |
62 | ||
63 | pci_wakeup_event(pci_dev); | |
64 | pm_runtime_resume(&pci_dev->dev); | |
a424948d RW |
65 | |
66 | if (pci_dev->subordinate) | |
67 | pci_pme_wakeup_bus(pci_dev->subordinate); | |
b67ea761 RW |
68 | } |
69 | ||
b67ea761 RW |
70 | /** |
71 | * pci_acpi_add_bus_pm_notifier - Register PM notifier for given PCI bus. | |
72 | * @dev: ACPI device to add the notifier for. | |
73 | * @pci_bus: PCI bus to walk checking for PME status if an event is signaled. | |
74 | */ | |
75 | acpi_status pci_acpi_add_bus_pm_notifier(struct acpi_device *dev, | |
76 | struct pci_bus *pci_bus) | |
77 | { | |
ec2cd81c | 78 | return acpi_add_pm_notifier(dev, pci_acpi_wake_bus, pci_bus); |
b67ea761 RW |
79 | } |
80 | ||
81 | /** | |
82 | * pci_acpi_remove_bus_pm_notifier - Unregister PCI bus PM notifier. | |
83 | * @dev: ACPI device to remove the notifier from. | |
84 | */ | |
85 | acpi_status pci_acpi_remove_bus_pm_notifier(struct acpi_device *dev) | |
86 | { | |
ec2cd81c | 87 | return acpi_remove_pm_notifier(dev, pci_acpi_wake_bus); |
b67ea761 RW |
88 | } |
89 | ||
90 | /** | |
91 | * pci_acpi_add_pm_notifier - Register PM notifier for given PCI device. | |
92 | * @dev: ACPI device to add the notifier for. | |
93 | * @pci_dev: PCI device to check for the PME status if an event is signaled. | |
94 | */ | |
95 | acpi_status pci_acpi_add_pm_notifier(struct acpi_device *dev, | |
96 | struct pci_dev *pci_dev) | |
97 | { | |
ec2cd81c | 98 | return acpi_add_pm_notifier(dev, pci_acpi_wake_dev, pci_dev); |
b67ea761 RW |
99 | } |
100 | ||
101 | /** | |
102 | * pci_acpi_remove_pm_notifier - Unregister PCI device PM notifier. | |
103 | * @dev: ACPI device to remove the notifier from. | |
104 | */ | |
105 | acpi_status pci_acpi_remove_pm_notifier(struct acpi_device *dev) | |
106 | { | |
ec2cd81c | 107 | return acpi_remove_pm_notifier(dev, pci_acpi_wake_dev); |
b67ea761 RW |
108 | } |
109 | ||
f4b57a3b JL |
110 | phys_addr_t acpi_pci_root_get_mcfg_addr(acpi_handle handle) |
111 | { | |
112 | acpi_status status = AE_NOT_EXIST; | |
113 | unsigned long long mcfg_addr; | |
114 | ||
115 | if (handle) | |
116 | status = acpi_evaluate_integer(handle, METHOD_NAME__CBA, | |
117 | NULL, &mcfg_addr); | |
118 | if (ACPI_FAILURE(status)) | |
119 | return 0; | |
120 | ||
121 | return (phys_addr_t)mcfg_addr; | |
122 | } | |
123 | ||
0f64474b DSL |
124 | /* |
125 | * _SxD returns the D-state with the highest power | |
126 | * (lowest D-state number) supported in the S-state "x". | |
127 | * | |
128 | * If the devices does not have a _PRW | |
129 | * (Power Resources for Wake) supporting system wakeup from "x" | |
130 | * then the OS is free to choose a lower power (higher number | |
131 | * D-state) than the return value from _SxD. | |
132 | * | |
133 | * But if _PRW is enabled at S-state "x", the OS | |
134 | * must not choose a power lower than _SxD -- | |
135 | * unless the device has an _SxW method specifying | |
136 | * the lowest power (highest D-state number) the device | |
137 | * may enter while still able to wake the system. | |
138 | * | |
139 | * ie. depending on global OS policy: | |
140 | * | |
141 | * if (_PRW at S-state x) | |
142 | * choose from highest power _SxD to lowest power _SxW | |
143 | * else // no _PRW at S-state x | |
144 | * choose highest power _SxD or any lower power | |
0f64474b DSL |
145 | */ |
146 | ||
8d2bdf49 | 147 | static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev) |
0f64474b | 148 | { |
448bd857 | 149 | int acpi_state, d_max; |
0f64474b | 150 | |
448bd857 HY |
151 | if (pdev->no_d3cold) |
152 | d_max = ACPI_STATE_D3_HOT; | |
153 | else | |
154 | d_max = ACPI_STATE_D3_COLD; | |
155 | acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL, d_max); | |
ab826ca4 SL |
156 | if (acpi_state < 0) |
157 | return PCI_POWER_ERROR; | |
158 | ||
159 | switch (acpi_state) { | |
160 | case ACPI_STATE_D0: | |
161 | return PCI_D0; | |
162 | case ACPI_STATE_D1: | |
163 | return PCI_D1; | |
164 | case ACPI_STATE_D2: | |
165 | return PCI_D2; | |
1cc0c998 | 166 | case ACPI_STATE_D3_HOT: |
ab826ca4 | 167 | return PCI_D3hot; |
28c2103d LM |
168 | case ACPI_STATE_D3_COLD: |
169 | return PCI_D3cold; | |
ab826ca4 SL |
170 | } |
171 | return PCI_POWER_ERROR; | |
0f64474b | 172 | } |
961d9120 RW |
173 | |
174 | static bool acpi_pci_power_manageable(struct pci_dev *dev) | |
175 | { | |
176 | acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev); | |
177 | ||
178 | return handle ? acpi_bus_power_manageable(handle) : false; | |
179 | } | |
0f64474b | 180 | |
b913100d DSL |
181 | static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state) |
182 | { | |
183 | acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev); | |
10b3dcae | 184 | acpi_handle tmp; |
583c377f DB |
185 | static const u8 state_conv[] = { |
186 | [PCI_D0] = ACPI_STATE_D0, | |
187 | [PCI_D1] = ACPI_STATE_D1, | |
188 | [PCI_D2] = ACPI_STATE_D2, | |
fc6504b3 RW |
189 | [PCI_D3hot] = ACPI_STATE_D3_COLD, |
190 | [PCI_D3cold] = ACPI_STATE_D3_COLD, | |
b913100d | 191 | }; |
44e4e66e | 192 | int error = -EINVAL; |
b913100d | 193 | |
10b3dcae | 194 | /* If the ACPI device has _EJ0, ignore the device */ |
44e4e66e RW |
195 | if (!handle || ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp))) |
196 | return -ENODEV; | |
583c377f DB |
197 | |
198 | switch (state) { | |
8b713a88 RW |
199 | case PCI_D3cold: |
200 | if (dev_pm_qos_flags(&dev->dev, PM_QOS_FLAG_NO_POWER_OFF) == | |
201 | PM_QOS_FLAGS_ALL) { | |
202 | error = -EBUSY; | |
203 | break; | |
204 | } | |
583c377f DB |
205 | case PCI_D0: |
206 | case PCI_D1: | |
207 | case PCI_D2: | |
208 | case PCI_D3hot: | |
44e4e66e | 209 | error = acpi_bus_set_power(handle, state_conv[state]); |
583c377f | 210 | } |
44e4e66e RW |
211 | |
212 | if (!error) | |
3d0882c0 | 213 | dev_info(&dev->dev, "power state changed by ACPI to %s\n", |
fc6504b3 | 214 | acpi_power_state_string(state_conv[state])); |
44e4e66e RW |
215 | |
216 | return error; | |
b913100d DSL |
217 | } |
218 | ||
eb9d0fe4 RW |
219 | static bool acpi_pci_can_wakeup(struct pci_dev *dev) |
220 | { | |
221 | acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev); | |
222 | ||
223 | return handle ? acpi_bus_can_wakeup(handle) : false; | |
224 | } | |
225 | ||
0baed8da RW |
226 | static void acpi_pci_propagate_wakeup_enable(struct pci_bus *bus, bool enable) |
227 | { | |
228 | while (bus->parent) { | |
dc1a94ae | 229 | if (!acpi_pm_device_sleep_wake(&bus->self->dev, enable)) |
0baed8da RW |
230 | return; |
231 | bus = bus->parent; | |
232 | } | |
233 | ||
234 | /* We have reached the root bus. */ | |
235 | if (bus->bridge) | |
236 | acpi_pm_device_sleep_wake(bus->bridge, enable); | |
237 | } | |
238 | ||
eb9d0fe4 RW |
239 | static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable) |
240 | { | |
0baed8da RW |
241 | if (acpi_pci_can_wakeup(dev)) |
242 | return acpi_pm_device_sleep_wake(&dev->dev, enable); | |
243 | ||
dc1a94ae | 244 | acpi_pci_propagate_wakeup_enable(dev->bus, enable); |
0baed8da | 245 | return 0; |
eb9d0fe4 RW |
246 | } |
247 | ||
b67ea761 RW |
248 | static void acpi_pci_propagate_run_wake(struct pci_bus *bus, bool enable) |
249 | { | |
250 | while (bus->parent) { | |
251 | struct pci_dev *bridge = bus->self; | |
252 | ||
253 | if (bridge->pme_interrupt) | |
254 | return; | |
b24e5098 | 255 | if (!acpi_pm_device_run_wake(&bridge->dev, enable)) |
b67ea761 RW |
256 | return; |
257 | bus = bus->parent; | |
258 | } | |
259 | ||
260 | /* We have reached the root bus. */ | |
261 | if (bus->bridge) | |
b24e5098 | 262 | acpi_pm_device_run_wake(bus->bridge, enable); |
b67ea761 RW |
263 | } |
264 | ||
265 | static int acpi_pci_run_wake(struct pci_dev *dev, bool enable) | |
266 | { | |
448bd857 HY |
267 | /* |
268 | * Per PCI Express Base Specification Revision 2.0 section | |
269 | * 5.3.3.2 Link Wakeup, platform support is needed for D3cold | |
270 | * waking up to power on the main link even if there is PME | |
271 | * support for D3cold | |
272 | */ | |
273 | if (dev->pme_interrupt && !dev->runtime_d3cold) | |
b67ea761 RW |
274 | return 0; |
275 | ||
b24e5098 | 276 | if (!acpi_pm_device_run_wake(&dev->dev, enable)) |
b67ea761 RW |
277 | return 0; |
278 | ||
279 | acpi_pci_propagate_run_wake(dev->bus, enable); | |
280 | return 0; | |
281 | } | |
282 | ||
961d9120 RW |
283 | static struct pci_platform_pm_ops acpi_pci_platform_pm = { |
284 | .is_manageable = acpi_pci_power_manageable, | |
285 | .set_state = acpi_pci_set_power_state, | |
286 | .choose_state = acpi_pci_choose_state, | |
eb9d0fe4 | 287 | .sleep_wake = acpi_pci_sleep_wake, |
b67ea761 | 288 | .run_wake = acpi_pci_run_wake, |
961d9120 | 289 | }; |
b913100d | 290 | |
5090d4a6 JL |
291 | void acpi_pci_add_bus(struct pci_bus *bus) |
292 | { | |
293 | acpi_handle handle = NULL; | |
294 | ||
295 | if (bus->bridge) | |
296 | handle = ACPI_HANDLE(bus->bridge); | |
297 | if (acpi_pci_disabled || handle == NULL) | |
298 | return; | |
299 | ||
5c0b04e3 | 300 | acpi_pci_slot_enumerate(bus, handle); |
3b63aaa7 | 301 | acpiphp_enumerate_slots(bus, handle); |
5090d4a6 JL |
302 | } |
303 | ||
304 | void acpi_pci_remove_bus(struct pci_bus *bus) | |
305 | { | |
306 | /* | |
307 | * bus->bridge->acpi_node.handle has already been reset to NULL | |
308 | * when acpi_pci_remove_bus() is called, so don't check ACPI handle. | |
309 | */ | |
310 | if (acpi_pci_disabled) | |
311 | return; | |
312 | ||
3b63aaa7 | 313 | acpiphp_remove_slots(bus); |
5c0b04e3 | 314 | acpi_pci_slot_remove(bus); |
5090d4a6 JL |
315 | } |
316 | ||
84df749f | 317 | /* ACPI bus type */ |
9c273b95 | 318 | static int acpi_pci_find_device(struct device *dev, acpi_handle *handle) |
84df749f DSL |
319 | { |
320 | struct pci_dev * pci_dev; | |
439913ff | 321 | u64 addr; |
84df749f DSL |
322 | |
323 | pci_dev = to_pci_dev(dev); | |
324 | /* Please ref to ACPI spec for the syntax of _ADR */ | |
325 | addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn); | |
326 | *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr); | |
327 | if (!*handle) | |
328 | return -ENODEV; | |
329 | return 0; | |
330 | } | |
331 | ||
38a9a67a | 332 | static void pci_acpi_setup(struct device *dev) |
d2e5f0c1 | 333 | { |
d2e5f0c1 | 334 | struct pci_dev *pci_dev = to_pci_dev(dev); |
38a9a67a RW |
335 | acpi_handle handle = ACPI_HANDLE(dev); |
336 | struct acpi_device *adev; | |
38a9a67a | 337 | |
38a9a67a | 338 | if (acpi_bus_get_device(handle, &adev) || !adev->wakeup.flags.valid) |
d2e5f0c1 RW |
339 | return; |
340 | ||
341 | device_set_wakeup_capable(dev, true); | |
342 | acpi_pci_sleep_wake(pci_dev, false); | |
343 | ||
344 | pci_acpi_add_pm_notifier(adev, pci_dev); | |
345 | if (adev->wakeup.flags.run_wake) | |
346 | device_set_run_wake(dev, true); | |
347 | } | |
348 | ||
38a9a67a | 349 | static void pci_acpi_cleanup(struct device *dev) |
d2e5f0c1 | 350 | { |
38a9a67a RW |
351 | acpi_handle handle = ACPI_HANDLE(dev); |
352 | struct acpi_device *adev; | |
d2e5f0c1 | 353 | |
38a9a67a | 354 | if (!acpi_bus_get_device(handle, &adev) && adev->wakeup.flags.valid) { |
d2e5f0c1 RW |
355 | device_set_wakeup_capable(dev, false); |
356 | device_set_run_wake(dev, false); | |
357 | pci_acpi_remove_pm_notifier(adev); | |
358 | } | |
359 | } | |
360 | ||
53540098 RW |
361 | static bool pci_acpi_bus_match(struct device *dev) |
362 | { | |
363 | return dev->bus == &pci_bus_type; | |
364 | } | |
365 | ||
9c273b95 | 366 | static struct acpi_bus_type acpi_pci_bus = { |
53540098 RW |
367 | .name = "PCI", |
368 | .match = pci_acpi_bus_match, | |
9c273b95 | 369 | .find_device = acpi_pci_find_device, |
38a9a67a RW |
370 | .setup = pci_acpi_setup, |
371 | .cleanup = pci_acpi_cleanup, | |
84df749f DSL |
372 | }; |
373 | ||
9c273b95 | 374 | static int __init acpi_pci_init(void) |
84df749f DSL |
375 | { |
376 | int ret; | |
377 | ||
993958fe | 378 | if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_MSI) { |
e7d45152 | 379 | pr_info("ACPI FADT declares the system doesn't support MSI, so disable it\n"); |
f8993aff SL |
380 | pci_no_msi(); |
381 | } | |
5fde244d | 382 | |
993958fe | 383 | if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) { |
e7d45152 | 384 | pr_info("ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n"); |
5fde244d SL |
385 | pcie_no_aspm(); |
386 | } | |
387 | ||
9c273b95 | 388 | ret = register_acpi_bus_type(&acpi_pci_bus); |
84df749f DSL |
389 | if (ret) |
390 | return 0; | |
5c0b04e3 | 391 | |
961d9120 | 392 | pci_set_platform_pm(&acpi_pci_platform_pm); |
5c0b04e3 | 393 | acpi_pci_slot_init(); |
3b63aaa7 | 394 | acpiphp_init(); |
5c0b04e3 | 395 | |
84df749f DSL |
396 | return 0; |
397 | } | |
9c273b95 | 398 | arch_initcall(acpi_pci_init); |