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 | ||
51 | if (!pci_dev->pm_cap || !pci_dev->pme_support | |
52 | || pci_check_pme_status(pci_dev)) { | |
379021d5 RW |
53 | if (pci_dev->pme_poll) |
54 | pci_dev->pme_poll = false; | |
55 | ||
0f953bf6 | 56 | pci_wakeup_event(pci_dev); |
b67ea761 | 57 | pm_runtime_resume(&pci_dev->dev); |
b67ea761 | 58 | } |
a424948d RW |
59 | |
60 | if (pci_dev->subordinate) | |
61 | pci_pme_wakeup_bus(pci_dev->subordinate); | |
b67ea761 RW |
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 | */ | |
74 | static 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 | */ | |
102 | static 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 | */ | |
130 | acpi_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 | */ | |
140 | acpi_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 | */ | |
150 | acpi_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 | */ | |
160 | acpi_status pci_acpi_remove_pm_notifier(struct acpi_device *dev) | |
161 | { | |
162 | return remove_pm_notifier(dev, pci_acpi_wake_dev); | |
163 | } | |
164 | ||
0f64474b DSL |
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 | |
0f64474b DSL |
186 | */ |
187 | ||
8d2bdf49 | 188 | static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev) |
0f64474b | 189 | { |
ab826ca4 | 190 | int acpi_state; |
0f64474b | 191 | |
06166780 | 192 | acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL); |
ab826ca4 SL |
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; | |
1cc0c998 | 203 | case ACPI_STATE_D3_HOT: |
ab826ca4 | 204 | return PCI_D3hot; |
28c2103d LM |
205 | case ACPI_STATE_D3_COLD: |
206 | return PCI_D3cold; | |
ab826ca4 SL |
207 | } |
208 | return PCI_POWER_ERROR; | |
0f64474b | 209 | } |
961d9120 RW |
210 | |
211 | static 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 | } | |
0f64474b | 217 | |
b913100d DSL |
218 | static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state) |
219 | { | |
220 | acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev); | |
10b3dcae | 221 | acpi_handle tmp; |
583c377f DB |
222 | static const u8 state_conv[] = { |
223 | [PCI_D0] = ACPI_STATE_D0, | |
224 | [PCI_D1] = ACPI_STATE_D1, | |
225 | [PCI_D2] = ACPI_STATE_D2, | |
5c7dd710 | 226 | [PCI_D3hot] = ACPI_STATE_D3, |
583c377f | 227 | [PCI_D3cold] = ACPI_STATE_D3 |
b913100d | 228 | }; |
44e4e66e | 229 | int error = -EINVAL; |
b913100d | 230 | |
10b3dcae | 231 | /* If the ACPI device has _EJ0, ignore the device */ |
44e4e66e RW |
232 | if (!handle || ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp))) |
233 | return -ENODEV; | |
583c377f DB |
234 | |
235 | switch (state) { | |
236 | case PCI_D0: | |
237 | case PCI_D1: | |
238 | case PCI_D2: | |
239 | case PCI_D3hot: | |
240 | case PCI_D3cold: | |
44e4e66e | 241 | error = acpi_bus_set_power(handle, state_conv[state]); |
583c377f | 242 | } |
44e4e66e RW |
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; | |
b913100d DSL |
249 | } |
250 | ||
eb9d0fe4 RW |
251 | static 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 | ||
0baed8da RW |
258 | static void acpi_pci_propagate_wakeup_enable(struct pci_bus *bus, bool enable) |
259 | { | |
260 | while (bus->parent) { | |
dc1a94ae | 261 | if (!acpi_pm_device_sleep_wake(&bus->self->dev, enable)) |
0baed8da RW |
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 | ||
eb9d0fe4 RW |
271 | static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable) |
272 | { | |
0baed8da RW |
273 | if (acpi_pci_can_wakeup(dev)) |
274 | return acpi_pm_device_sleep_wake(&dev->dev, enable); | |
275 | ||
dc1a94ae | 276 | acpi_pci_propagate_wakeup_enable(dev->bus, enable); |
0baed8da | 277 | return 0; |
eb9d0fe4 RW |
278 | } |
279 | ||
b67ea761 RW |
280 | static 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; | |
b24e5098 | 287 | if (!acpi_pm_device_run_wake(&bridge->dev, enable)) |
b67ea761 RW |
288 | return; |
289 | bus = bus->parent; | |
290 | } | |
291 | ||
292 | /* We have reached the root bus. */ | |
293 | if (bus->bridge) | |
b24e5098 | 294 | acpi_pm_device_run_wake(bus->bridge, enable); |
b67ea761 RW |
295 | } |
296 | ||
297 | static int acpi_pci_run_wake(struct pci_dev *dev, bool enable) | |
298 | { | |
299 | if (dev->pme_interrupt) | |
300 | return 0; | |
301 | ||
b24e5098 | 302 | if (!acpi_pm_device_run_wake(&dev->dev, enable)) |
b67ea761 RW |
303 | return 0; |
304 | ||
305 | acpi_pci_propagate_run_wake(dev->bus, enable); | |
306 | return 0; | |
307 | } | |
308 | ||
961d9120 RW |
309 | static 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, | |
eb9d0fe4 RW |
313 | .can_wakeup = acpi_pci_can_wakeup, |
314 | .sleep_wake = acpi_pci_sleep_wake, | |
b67ea761 | 315 | .run_wake = acpi_pci_run_wake, |
961d9120 | 316 | }; |
b913100d | 317 | |
84df749f | 318 | /* ACPI bus type */ |
9c273b95 | 319 | static int acpi_pci_find_device(struct device *dev, acpi_handle *handle) |
84df749f DSL |
320 | { |
321 | struct pci_dev * pci_dev; | |
439913ff | 322 | u64 addr; |
84df749f DSL |
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 | ||
9c273b95 | 333 | static int acpi_pci_find_root_bridge(struct device *dev, acpi_handle *handle) |
84df749f DSL |
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 | */ | |
1a927133 | 342 | num = sscanf(dev_name(dev), "pci%04x:%02x", &seg, &bus); |
84df749f DSL |
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 | ||
9c273b95 | 351 | static struct acpi_bus_type acpi_pci_bus = { |
84df749f | 352 | .bus = &pci_bus_type, |
9c273b95 MK |
353 | .find_device = acpi_pci_find_device, |
354 | .find_bridge = acpi_pci_find_root_bridge, | |
84df749f DSL |
355 | }; |
356 | ||
9c273b95 | 357 | static int __init acpi_pci_init(void) |
84df749f DSL |
358 | { |
359 | int ret; | |
360 | ||
993958fe | 361 | if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_MSI) { |
f8993aff SL |
362 | printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n"); |
363 | pci_no_msi(); | |
364 | } | |
5fde244d | 365 | |
993958fe | 366 | if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) { |
5fde244d SL |
367 | printk(KERN_INFO"ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n"); |
368 | pcie_no_aspm(); | |
369 | } | |
370 | ||
9c273b95 | 371 | ret = register_acpi_bus_type(&acpi_pci_bus); |
84df749f DSL |
372 | if (ret) |
373 | return 0; | |
961d9120 | 374 | pci_set_platform_pm(&acpi_pci_platform_pm); |
84df749f DSL |
375 | return 0; |
376 | } | |
9c273b95 | 377 | arch_initcall(acpi_pci_init); |