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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * File: pci-acpi.c
Len Browna406d9e2005-03-23 16:16:03 -05003 * Purpose: Provide PCI support in ACPI
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
David Shaohua Li84df749f2005-03-18 18:53:36 -05005 * 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 */
9
10#include <linux/delay.h>
11#include <linux/init.h>
12#include <linux/pci.h>
13#include <linux/module.h>
Shaohua Li5fde2442008-07-23 10:32:24 +080014#include <linux/pci-aspm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <acpi/acpi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <acpi/acpi_bus.h>
17
18#include <linux/pci-acpi.h>
Rafael J. Wysockib67ea762010-02-17 23:44:09 +010019#include <linux/pm_runtime.h>
David Shaohua Li0f644742005-03-19 00:15:48 -050020#include "pci.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070021
Rafael J. Wysockib67ea762010-02-17 23:44:09 +010022static 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 */
30static 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 */
44static 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) {
Rafael J. Wysocki0f953bf2010-12-29 13:22:08 +010049 pci_wakeup_event(pci_dev);
Rafael J. Wysockib67ea762010-02-17 23:44:09 +010050 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 */
67static 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 */
95static 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 */
123acpi_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 */
133acpi_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 */
143acpi_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 */
153acpi_status pci_acpi_remove_pm_notifier(struct acpi_device *dev)
154{
155 return remove_pm_notifier(dev, pci_acpi_wake_dev);
156}
157
David Shaohua Li0f644742005-03-19 00:15:48 -0500158/*
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
David Shaohua Li0f644742005-03-19 00:15:48 -0500179 */
180
Rafael J. Wysocki8d2bdf42008-06-05 01:16:37 +0200181static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
David Shaohua Li0f644742005-03-19 00:15:48 -0500182{
Shaohua Liab826ca2007-07-20 10:03:22 +0800183 int acpi_state;
David Shaohua Li0f644742005-03-19 00:15:48 -0500184
David Brownell06166782008-06-05 01:15:40 +0200185 acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL);
Shaohua Liab826ca2007-07-20 10:03:22 +0800186 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;
David Shaohua Li0f644742005-03-19 00:15:48 -0500200}
Rafael J. Wysocki961d9122008-07-07 03:32:02 +0200201
202static 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}
David Shaohua Li0f644742005-03-19 00:15:48 -0500208
David Shaohua Lib9131002005-03-19 00:16:18 -0500209static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
210{
211 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
Shaohua Li10b3dca2007-07-20 10:03:25 +0800212 acpi_handle tmp;
David Brownell583c3772008-02-22 21:41:51 -0800213 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
David Shaohua Lib9131002005-03-19 00:16:18 -0500219 };
Rafael J. Wysocki44e4e662008-07-07 03:32:52 +0200220 int error = -EINVAL;
David Shaohua Lib9131002005-03-19 00:16:18 -0500221
Shaohua Li10b3dca2007-07-20 10:03:25 +0800222 /* If the ACPI device has _EJ0, ignore the device */
Rafael J. Wysocki44e4e662008-07-07 03:32:52 +0200223 if (!handle || ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
224 return -ENODEV;
David Brownell583c3772008-02-22 21:41:51 -0800225
226 switch (state) {
227 case PCI_D0:
228 case PCI_D1:
229 case PCI_D2:
230 case PCI_D3hot:
231 case PCI_D3cold:
Rafael J. Wysocki44e4e662008-07-07 03:32:52 +0200232 error = acpi_bus_set_power(handle, state_conv[state]);
David Brownell583c3772008-02-22 21:41:51 -0800233 }
Rafael J. Wysocki44e4e662008-07-07 03:32:52 +0200234
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;
David Shaohua Lib9131002005-03-19 00:16:18 -0500240}
241
Rafael J. Wysockieb9d0fe2008-07-07 03:34:48 +0200242static 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
Rafael J. Wysocki0baed8d2009-09-08 23:16:24 +0200249static void acpi_pci_propagate_wakeup_enable(struct pci_bus *bus, bool enable)
250{
251 while (bus->parent) {
Rafael J. Wysockidc1a94a2009-11-29 16:35:54 +0100252 if (!acpi_pm_device_sleep_wake(&bus->self->dev, enable))
Rafael J. Wysocki0baed8d2009-09-08 23:16:24 +0200253 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
Rafael J. Wysockieb9d0fe2008-07-07 03:34:48 +0200262static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable)
263{
Rafael J. Wysocki0baed8d2009-09-08 23:16:24 +0200264 if (acpi_pci_can_wakeup(dev))
265 return acpi_pm_device_sleep_wake(&dev->dev, enable);
266
Rafael J. Wysockidc1a94a2009-11-29 16:35:54 +0100267 acpi_pci_propagate_wakeup_enable(dev->bus, enable);
Rafael J. Wysocki0baed8d2009-09-08 23:16:24 +0200268 return 0;
Rafael J. Wysockieb9d0fe2008-07-07 03:34:48 +0200269}
270
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100271/**
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 */
279static 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,
Rafael J. Wysockia44061a2010-07-01 10:11:45 +0800299 dev->wakeup.gpe_number);
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100300 }
301 } else if (dev->wakeup.run_wake_count > 0) {
302 if (!--dev->wakeup.run_wake_count) {
303 acpi_disable_gpe(dev->wakeup.gpe_device,
Rafael J. Wysockia44061a2010-07-01 10:11:45 +0800304 dev->wakeup.gpe_number);
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100305 acpi_disable_wakeup_device_power(dev);
306 }
307 } else {
308 error = -EALREADY;
309 }
310
311 return error;
312}
313
314static 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
331static 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
Rafael J. Wysocki961d9122008-07-07 03:32:02 +0200343static 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,
Rafael J. Wysockieb9d0fe2008-07-07 03:34:48 +0200347 .can_wakeup = acpi_pci_can_wakeup,
348 .sleep_wake = acpi_pci_sleep_wake,
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100349 .run_wake = acpi_pci_run_wake,
Rafael J. Wysocki961d9122008-07-07 03:32:02 +0200350};
David Shaohua Lib9131002005-03-19 00:16:18 -0500351
David Shaohua Li84df749f2005-03-18 18:53:36 -0500352/* ACPI bus type */
Muthu Kumar9c273b92006-04-28 00:42:21 -0700353static int acpi_pci_find_device(struct device *dev, acpi_handle *handle)
David Shaohua Li84df749f2005-03-18 18:53:36 -0500354{
355 struct pci_dev * pci_dev;
Lin Ming439913f2010-01-28 10:53:19 +0800356 u64 addr;
David Shaohua Li84df749f2005-03-18 18:53:36 -0500357
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
Muthu Kumar9c273b92006-04-28 00:42:21 -0700367static int acpi_pci_find_root_bridge(struct device *dev, acpi_handle *handle)
David Shaohua Li84df749f2005-03-18 18:53:36 -0500368{
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 */
Kay Sievers1a927132008-10-30 02:17:49 +0100376 num = sscanf(dev_name(dev), "pci%04x:%02x", &seg, &bus);
David Shaohua Li84df749f2005-03-18 18:53:36 -0500377 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
Muthu Kumar9c273b92006-04-28 00:42:21 -0700385static struct acpi_bus_type acpi_pci_bus = {
David Shaohua Li84df749f2005-03-18 18:53:36 -0500386 .bus = &pci_bus_type,
Muthu Kumar9c273b92006-04-28 00:42:21 -0700387 .find_device = acpi_pci_find_device,
388 .find_bridge = acpi_pci_find_root_bridge,
David Shaohua Li84df749f2005-03-18 18:53:36 -0500389};
390
Muthu Kumar9c273b92006-04-28 00:42:21 -0700391static int __init acpi_pci_init(void)
David Shaohua Li84df749f2005-03-18 18:53:36 -0500392{
393 int ret;
394
Bob Moore993958f2009-02-03 15:14:33 +0800395 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_MSI) {
Shaohua Lif8993af2007-04-25 11:05:12 +0800396 printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n");
397 pci_no_msi();
398 }
Shaohua Li5fde2442008-07-23 10:32:24 +0800399
Bob Moore993958f2009-02-03 15:14:33 +0800400 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
Shaohua Li5fde2442008-07-23 10:32:24 +0800401 printk(KERN_INFO"ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n");
Matthew Garrett2f671e22010-12-06 14:00:56 -0500402 pcie_clear_aspm();
Shaohua Li5fde2442008-07-23 10:32:24 +0800403 pcie_no_aspm();
404 }
405
Muthu Kumar9c273b92006-04-28 00:42:21 -0700406 ret = register_acpi_bus_type(&acpi_pci_bus);
David Shaohua Li84df749f2005-03-18 18:53:36 -0500407 if (ret)
408 return 0;
Rafael J. Wysocki961d9122008-07-07 03:32:02 +0200409 pci_set_platform_pm(&acpi_pci_platform_pm);
David Shaohua Li84df749f2005-03-18 18:53:36 -0500410 return 0;
411}
Muthu Kumar9c273b92006-04-28 00:42:21 -0700412arch_initcall(acpi_pci_init);