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> |
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 | ||
a424948d RW |
48 | if (event != ACPI_NOTIFY_DEVICE_WAKE || !pci_dev) |
49 | return; | |
50 | ||
448bd857 HY |
51 | if (pci_dev->current_state == PCI_D3cold) { |
52 | pci_wakeup_event(pci_dev); | |
53 | pm_runtime_resume(&pci_dev->dev); | |
54 | return; | |
55 | } | |
56 | ||
a424948d RW |
57 | if (!pci_dev->pm_cap || !pci_dev->pme_support |
58 | || pci_check_pme_status(pci_dev)) { | |
379021d5 RW |
59 | if (pci_dev->pme_poll) |
60 | pci_dev->pme_poll = false; | |
61 | ||
0f953bf6 | 62 | pci_wakeup_event(pci_dev); |
b67ea761 | 63 | pm_runtime_resume(&pci_dev->dev); |
b67ea761 | 64 | } |
a424948d RW |
65 | |
66 | if (pci_dev->subordinate) | |
67 | pci_pme_wakeup_bus(pci_dev->subordinate); | |
b67ea761 RW |
68 | } |
69 | ||
70 | /** | |
71 | * add_pm_notifier - Register PM notifier for given ACPI device. | |
72 | * @dev: ACPI device to add the notifier for. | |
73 | * @context: PCI device or bus to check for PME status if an event is signaled. | |
74 | * | |
75 | * NOTE: @dev need not be a run-wake or wake-up device to be a valid source of | |
76 | * PM wake-up events. For example, wake-up events may be generated for bridges | |
77 | * if one of the devices below the bridge is signaling PME, even if the bridge | |
78 | * itself doesn't have a wake-up GPE associated with it. | |
79 | */ | |
80 | static acpi_status add_pm_notifier(struct acpi_device *dev, | |
81 | acpi_notify_handler handler, | |
82 | void *context) | |
83 | { | |
84 | acpi_status status = AE_ALREADY_EXISTS; | |
85 | ||
86 | mutex_lock(&pci_acpi_pm_notify_mtx); | |
87 | ||
88 | if (dev->wakeup.flags.notifier_present) | |
89 | goto out; | |
90 | ||
91 | status = acpi_install_notify_handler(dev->handle, | |
92 | ACPI_SYSTEM_NOTIFY, | |
93 | handler, context); | |
94 | if (ACPI_FAILURE(status)) | |
95 | goto out; | |
96 | ||
97 | dev->wakeup.flags.notifier_present = true; | |
98 | ||
99 | out: | |
100 | mutex_unlock(&pci_acpi_pm_notify_mtx); | |
101 | return status; | |
102 | } | |
103 | ||
104 | /** | |
105 | * remove_pm_notifier - Unregister PM notifier from given ACPI device. | |
106 | * @dev: ACPI device to remove the notifier from. | |
107 | */ | |
108 | static acpi_status remove_pm_notifier(struct acpi_device *dev, | |
109 | acpi_notify_handler handler) | |
110 | { | |
111 | acpi_status status = AE_BAD_PARAMETER; | |
112 | ||
113 | mutex_lock(&pci_acpi_pm_notify_mtx); | |
114 | ||
115 | if (!dev->wakeup.flags.notifier_present) | |
116 | goto out; | |
117 | ||
118 | status = acpi_remove_notify_handler(dev->handle, | |
119 | ACPI_SYSTEM_NOTIFY, | |
120 | handler); | |
121 | if (ACPI_FAILURE(status)) | |
122 | goto out; | |
123 | ||
124 | dev->wakeup.flags.notifier_present = false; | |
125 | ||
126 | out: | |
127 | mutex_unlock(&pci_acpi_pm_notify_mtx); | |
128 | return status; | |
129 | } | |
130 | ||
131 | /** | |
132 | * pci_acpi_add_bus_pm_notifier - Register PM notifier for given PCI bus. | |
133 | * @dev: ACPI device to add the notifier for. | |
134 | * @pci_bus: PCI bus to walk checking for PME status if an event is signaled. | |
135 | */ | |
136 | acpi_status pci_acpi_add_bus_pm_notifier(struct acpi_device *dev, | |
137 | struct pci_bus *pci_bus) | |
138 | { | |
139 | return add_pm_notifier(dev, pci_acpi_wake_bus, pci_bus); | |
140 | } | |
141 | ||
142 | /** | |
143 | * pci_acpi_remove_bus_pm_notifier - Unregister PCI bus PM notifier. | |
144 | * @dev: ACPI device to remove the notifier from. | |
145 | */ | |
146 | acpi_status pci_acpi_remove_bus_pm_notifier(struct acpi_device *dev) | |
147 | { | |
148 | return remove_pm_notifier(dev, pci_acpi_wake_bus); | |
149 | } | |
150 | ||
151 | /** | |
152 | * pci_acpi_add_pm_notifier - Register PM notifier for given PCI device. | |
153 | * @dev: ACPI device to add the notifier for. | |
154 | * @pci_dev: PCI device to check for the PME status if an event is signaled. | |
155 | */ | |
156 | acpi_status pci_acpi_add_pm_notifier(struct acpi_device *dev, | |
157 | struct pci_dev *pci_dev) | |
158 | { | |
159 | return add_pm_notifier(dev, pci_acpi_wake_dev, pci_dev); | |
160 | } | |
161 | ||
162 | /** | |
163 | * pci_acpi_remove_pm_notifier - Unregister PCI device PM notifier. | |
164 | * @dev: ACPI device to remove the notifier from. | |
165 | */ | |
166 | acpi_status pci_acpi_remove_pm_notifier(struct acpi_device *dev) | |
167 | { | |
168 | return remove_pm_notifier(dev, pci_acpi_wake_dev); | |
169 | } | |
170 | ||
f4b57a3b JL |
171 | phys_addr_t acpi_pci_root_get_mcfg_addr(acpi_handle handle) |
172 | { | |
173 | acpi_status status = AE_NOT_EXIST; | |
174 | unsigned long long mcfg_addr; | |
175 | ||
176 | if (handle) | |
177 | status = acpi_evaluate_integer(handle, METHOD_NAME__CBA, | |
178 | NULL, &mcfg_addr); | |
179 | if (ACPI_FAILURE(status)) | |
180 | return 0; | |
181 | ||
182 | return (phys_addr_t)mcfg_addr; | |
183 | } | |
184 | ||
0f64474b DSL |
185 | /* |
186 | * _SxD returns the D-state with the highest power | |
187 | * (lowest D-state number) supported in the S-state "x". | |
188 | * | |
189 | * If the devices does not have a _PRW | |
190 | * (Power Resources for Wake) supporting system wakeup from "x" | |
191 | * then the OS is free to choose a lower power (higher number | |
192 | * D-state) than the return value from _SxD. | |
193 | * | |
194 | * But if _PRW is enabled at S-state "x", the OS | |
195 | * must not choose a power lower than _SxD -- | |
196 | * unless the device has an _SxW method specifying | |
197 | * the lowest power (highest D-state number) the device | |
198 | * may enter while still able to wake the system. | |
199 | * | |
200 | * ie. depending on global OS policy: | |
201 | * | |
202 | * if (_PRW at S-state x) | |
203 | * choose from highest power _SxD to lowest power _SxW | |
204 | * else // no _PRW at S-state x | |
205 | * choose highest power _SxD or any lower power | |
0f64474b DSL |
206 | */ |
207 | ||
8d2bdf49 | 208 | static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev) |
0f64474b | 209 | { |
448bd857 | 210 | int acpi_state, d_max; |
0f64474b | 211 | |
448bd857 HY |
212 | if (pdev->no_d3cold) |
213 | d_max = ACPI_STATE_D3_HOT; | |
214 | else | |
215 | d_max = ACPI_STATE_D3_COLD; | |
216 | acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL, d_max); | |
ab826ca4 SL |
217 | if (acpi_state < 0) |
218 | return PCI_POWER_ERROR; | |
219 | ||
220 | switch (acpi_state) { | |
221 | case ACPI_STATE_D0: | |
222 | return PCI_D0; | |
223 | case ACPI_STATE_D1: | |
224 | return PCI_D1; | |
225 | case ACPI_STATE_D2: | |
226 | return PCI_D2; | |
1cc0c998 | 227 | case ACPI_STATE_D3_HOT: |
ab826ca4 | 228 | return PCI_D3hot; |
28c2103d LM |
229 | case ACPI_STATE_D3_COLD: |
230 | return PCI_D3cold; | |
ab826ca4 SL |
231 | } |
232 | return PCI_POWER_ERROR; | |
0f64474b | 233 | } |
961d9120 RW |
234 | |
235 | static bool acpi_pci_power_manageable(struct pci_dev *dev) | |
236 | { | |
237 | acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev); | |
238 | ||
239 | return handle ? acpi_bus_power_manageable(handle) : false; | |
240 | } | |
0f64474b | 241 | |
b913100d DSL |
242 | static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state) |
243 | { | |
244 | acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev); | |
10b3dcae | 245 | acpi_handle tmp; |
583c377f DB |
246 | static const u8 state_conv[] = { |
247 | [PCI_D0] = ACPI_STATE_D0, | |
248 | [PCI_D1] = ACPI_STATE_D1, | |
249 | [PCI_D2] = ACPI_STATE_D2, | |
5c7dd710 | 250 | [PCI_D3hot] = ACPI_STATE_D3, |
583c377f | 251 | [PCI_D3cold] = ACPI_STATE_D3 |
b913100d | 252 | }; |
44e4e66e | 253 | int error = -EINVAL; |
b913100d | 254 | |
10b3dcae | 255 | /* If the ACPI device has _EJ0, ignore the device */ |
44e4e66e RW |
256 | if (!handle || ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp))) |
257 | return -ENODEV; | |
583c377f DB |
258 | |
259 | switch (state) { | |
260 | case PCI_D0: | |
261 | case PCI_D1: | |
262 | case PCI_D2: | |
263 | case PCI_D3hot: | |
264 | case PCI_D3cold: | |
44e4e66e | 265 | error = acpi_bus_set_power(handle, state_conv[state]); |
583c377f | 266 | } |
44e4e66e RW |
267 | |
268 | if (!error) | |
3d0882c0 RW |
269 | dev_info(&dev->dev, "power state changed by ACPI to %s\n", |
270 | pci_power_name(state)); | |
44e4e66e RW |
271 | |
272 | return error; | |
b913100d DSL |
273 | } |
274 | ||
eb9d0fe4 RW |
275 | static bool acpi_pci_can_wakeup(struct pci_dev *dev) |
276 | { | |
277 | acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev); | |
278 | ||
279 | return handle ? acpi_bus_can_wakeup(handle) : false; | |
280 | } | |
281 | ||
0baed8da RW |
282 | static void acpi_pci_propagate_wakeup_enable(struct pci_bus *bus, bool enable) |
283 | { | |
284 | while (bus->parent) { | |
dc1a94ae | 285 | if (!acpi_pm_device_sleep_wake(&bus->self->dev, enable)) |
0baed8da RW |
286 | return; |
287 | bus = bus->parent; | |
288 | } | |
289 | ||
290 | /* We have reached the root bus. */ | |
291 | if (bus->bridge) | |
292 | acpi_pm_device_sleep_wake(bus->bridge, enable); | |
293 | } | |
294 | ||
eb9d0fe4 RW |
295 | static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable) |
296 | { | |
0baed8da RW |
297 | if (acpi_pci_can_wakeup(dev)) |
298 | return acpi_pm_device_sleep_wake(&dev->dev, enable); | |
299 | ||
dc1a94ae | 300 | acpi_pci_propagate_wakeup_enable(dev->bus, enable); |
0baed8da | 301 | return 0; |
eb9d0fe4 RW |
302 | } |
303 | ||
b67ea761 RW |
304 | static void acpi_pci_propagate_run_wake(struct pci_bus *bus, bool enable) |
305 | { | |
306 | while (bus->parent) { | |
307 | struct pci_dev *bridge = bus->self; | |
308 | ||
309 | if (bridge->pme_interrupt) | |
310 | return; | |
b24e5098 | 311 | if (!acpi_pm_device_run_wake(&bridge->dev, enable)) |
b67ea761 RW |
312 | return; |
313 | bus = bus->parent; | |
314 | } | |
315 | ||
316 | /* We have reached the root bus. */ | |
317 | if (bus->bridge) | |
b24e5098 | 318 | acpi_pm_device_run_wake(bus->bridge, enable); |
b67ea761 RW |
319 | } |
320 | ||
321 | static int acpi_pci_run_wake(struct pci_dev *dev, bool enable) | |
322 | { | |
448bd857 HY |
323 | /* |
324 | * Per PCI Express Base Specification Revision 2.0 section | |
325 | * 5.3.3.2 Link Wakeup, platform support is needed for D3cold | |
326 | * waking up to power on the main link even if there is PME | |
327 | * support for D3cold | |
328 | */ | |
329 | if (dev->pme_interrupt && !dev->runtime_d3cold) | |
b67ea761 RW |
330 | return 0; |
331 | ||
b24e5098 | 332 | if (!acpi_pm_device_run_wake(&dev->dev, enable)) |
b67ea761 RW |
333 | return 0; |
334 | ||
335 | acpi_pci_propagate_run_wake(dev->bus, enable); | |
336 | return 0; | |
337 | } | |
338 | ||
961d9120 RW |
339 | static struct pci_platform_pm_ops acpi_pci_platform_pm = { |
340 | .is_manageable = acpi_pci_power_manageable, | |
341 | .set_state = acpi_pci_set_power_state, | |
342 | .choose_state = acpi_pci_choose_state, | |
eb9d0fe4 RW |
343 | .can_wakeup = acpi_pci_can_wakeup, |
344 | .sleep_wake = acpi_pci_sleep_wake, | |
b67ea761 | 345 | .run_wake = acpi_pci_run_wake, |
961d9120 | 346 | }; |
b913100d | 347 | |
84df749f | 348 | /* ACPI bus type */ |
9c273b95 | 349 | static int acpi_pci_find_device(struct device *dev, acpi_handle *handle) |
84df749f DSL |
350 | { |
351 | struct pci_dev * pci_dev; | |
439913ff | 352 | u64 addr; |
84df749f DSL |
353 | |
354 | pci_dev = to_pci_dev(dev); | |
355 | /* Please ref to ACPI spec for the syntax of _ADR */ | |
356 | addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn); | |
357 | *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr); | |
358 | if (!*handle) | |
359 | return -ENODEV; | |
360 | return 0; | |
361 | } | |
362 | ||
9c273b95 | 363 | static int acpi_pci_find_root_bridge(struct device *dev, acpi_handle *handle) |
84df749f DSL |
364 | { |
365 | int num; | |
366 | unsigned int seg, bus; | |
367 | ||
368 | /* | |
369 | * The string should be the same as root bridge's name | |
370 | * Please look at 'pci_scan_bus_parented' | |
371 | */ | |
1a927133 | 372 | num = sscanf(dev_name(dev), "pci%04x:%02x", &seg, &bus); |
84df749f DSL |
373 | if (num != 2) |
374 | return -ENODEV; | |
375 | *handle = acpi_get_pci_rootbridge_handle(seg, bus); | |
376 | if (!*handle) | |
377 | return -ENODEV; | |
378 | return 0; | |
379 | } | |
380 | ||
9c273b95 | 381 | static struct acpi_bus_type acpi_pci_bus = { |
84df749f | 382 | .bus = &pci_bus_type, |
9c273b95 MK |
383 | .find_device = acpi_pci_find_device, |
384 | .find_bridge = acpi_pci_find_root_bridge, | |
84df749f DSL |
385 | }; |
386 | ||
9c273b95 | 387 | static int __init acpi_pci_init(void) |
84df749f DSL |
388 | { |
389 | int ret; | |
390 | ||
993958fe | 391 | if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_MSI) { |
f8993aff SL |
392 | printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n"); |
393 | pci_no_msi(); | |
394 | } | |
5fde244d | 395 | |
993958fe | 396 | if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) { |
5fde244d SL |
397 | printk(KERN_INFO"ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n"); |
398 | pcie_no_aspm(); | |
399 | } | |
400 | ||
9c273b95 | 401 | ret = register_acpi_bus_type(&acpi_pci_bus); |
84df749f DSL |
402 | if (ret) |
403 | return 0; | |
961d9120 | 404 | pci_set_platform_pm(&acpi_pci_platform_pm); |
84df749f DSL |
405 | return 0; |
406 | } | |
9c273b95 | 407 | arch_initcall(acpi_pci_init); |