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 | 20 | /** |
c072530f RW |
21 | * pci_acpi_wake_bus - Root bus wakeup notification fork function. |
22 | * @work: Work item to handle. | |
b67ea761 | 23 | */ |
c072530f | 24 | static void pci_acpi_wake_bus(struct work_struct *work) |
b67ea761 | 25 | { |
c072530f RW |
26 | struct acpi_device *adev; |
27 | struct acpi_pci_root *root; | |
b67ea761 | 28 | |
c072530f RW |
29 | adev = container_of(work, struct acpi_device, wakeup.context.work); |
30 | root = acpi_driver_data(adev); | |
31 | pci_pme_wakeup_bus(root->bus); | |
b67ea761 RW |
32 | } |
33 | ||
34 | /** | |
c072530f | 35 | * pci_acpi_wake_dev - PCI device wakeup notification work function. |
b67ea761 | 36 | * @handle: ACPI handle of a device the notification is for. |
c072530f | 37 | * @work: Work item to handle. |
b67ea761 | 38 | */ |
c072530f | 39 | static void pci_acpi_wake_dev(struct work_struct *work) |
b67ea761 | 40 | { |
c072530f RW |
41 | struct acpi_device_wakeup_context *context; |
42 | struct pci_dev *pci_dev; | |
b67ea761 | 43 | |
c072530f RW |
44 | context = container_of(work, struct acpi_device_wakeup_context, work); |
45 | pci_dev = to_pci_dev(context->dev); | |
a424948d | 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 | 67 | /** |
c072530f RW |
68 | * pci_acpi_add_bus_pm_notifier - Register PM notifier for root PCI bus. |
69 | * @dev: PCI root bridge ACPI device. | |
b67ea761 | 70 | */ |
c072530f | 71 | acpi_status pci_acpi_add_bus_pm_notifier(struct acpi_device *dev) |
b67ea761 | 72 | { |
c072530f | 73 | return acpi_add_pm_notifier(dev, NULL, pci_acpi_wake_bus); |
b67ea761 RW |
74 | } |
75 | ||
76 | /** | |
77 | * pci_acpi_add_pm_notifier - Register PM notifier for given PCI device. | |
78 | * @dev: ACPI device to add the notifier for. | |
79 | * @pci_dev: PCI device to check for the PME status if an event is signaled. | |
80 | */ | |
81 | acpi_status pci_acpi_add_pm_notifier(struct acpi_device *dev, | |
82 | struct pci_dev *pci_dev) | |
83 | { | |
c072530f | 84 | return acpi_add_pm_notifier(dev, &pci_dev->dev, pci_acpi_wake_dev); |
b67ea761 RW |
85 | } |
86 | ||
f4b57a3b JL |
87 | phys_addr_t acpi_pci_root_get_mcfg_addr(acpi_handle handle) |
88 | { | |
89 | acpi_status status = AE_NOT_EXIST; | |
90 | unsigned long long mcfg_addr; | |
91 | ||
92 | if (handle) | |
93 | status = acpi_evaluate_integer(handle, METHOD_NAME__CBA, | |
94 | NULL, &mcfg_addr); | |
95 | if (ACPI_FAILURE(status)) | |
96 | return 0; | |
97 | ||
98 | return (phys_addr_t)mcfg_addr; | |
99 | } | |
100 | ||
0f64474b DSL |
101 | /* |
102 | * _SxD returns the D-state with the highest power | |
103 | * (lowest D-state number) supported in the S-state "x". | |
104 | * | |
105 | * If the devices does not have a _PRW | |
106 | * (Power Resources for Wake) supporting system wakeup from "x" | |
107 | * then the OS is free to choose a lower power (higher number | |
108 | * D-state) than the return value from _SxD. | |
109 | * | |
110 | * But if _PRW is enabled at S-state "x", the OS | |
111 | * must not choose a power lower than _SxD -- | |
112 | * unless the device has an _SxW method specifying | |
113 | * the lowest power (highest D-state number) the device | |
114 | * may enter while still able to wake the system. | |
115 | * | |
116 | * ie. depending on global OS policy: | |
117 | * | |
118 | * if (_PRW at S-state x) | |
119 | * choose from highest power _SxD to lowest power _SxW | |
120 | * else // no _PRW at S-state x | |
f7625980 | 121 | * choose highest power _SxD or any lower power |
0f64474b DSL |
122 | */ |
123 | ||
8d2bdf49 | 124 | static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev) |
0f64474b | 125 | { |
448bd857 | 126 | int acpi_state, d_max; |
0f64474b | 127 | |
448bd857 HY |
128 | if (pdev->no_d3cold) |
129 | d_max = ACPI_STATE_D3_HOT; | |
130 | else | |
131 | d_max = ACPI_STATE_D3_COLD; | |
132 | acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL, d_max); | |
ab826ca4 SL |
133 | if (acpi_state < 0) |
134 | return PCI_POWER_ERROR; | |
135 | ||
136 | switch (acpi_state) { | |
137 | case ACPI_STATE_D0: | |
138 | return PCI_D0; | |
139 | case ACPI_STATE_D1: | |
140 | return PCI_D1; | |
141 | case ACPI_STATE_D2: | |
142 | return PCI_D2; | |
1cc0c998 | 143 | case ACPI_STATE_D3_HOT: |
ab826ca4 | 144 | return PCI_D3hot; |
28c2103d LM |
145 | case ACPI_STATE_D3_COLD: |
146 | return PCI_D3cold; | |
ab826ca4 SL |
147 | } |
148 | return PCI_POWER_ERROR; | |
0f64474b | 149 | } |
961d9120 RW |
150 | |
151 | static bool acpi_pci_power_manageable(struct pci_dev *dev) | |
152 | { | |
85dbb3d0 RW |
153 | struct acpi_device *adev = ACPI_COMPANION(&dev->dev); |
154 | return adev ? acpi_device_power_manageable(adev) : false; | |
961d9120 | 155 | } |
0f64474b | 156 | |
b913100d DSL |
157 | static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state) |
158 | { | |
85dbb3d0 | 159 | struct acpi_device *adev = ACPI_COMPANION(&dev->dev); |
583c377f DB |
160 | static const u8 state_conv[] = { |
161 | [PCI_D0] = ACPI_STATE_D0, | |
162 | [PCI_D1] = ACPI_STATE_D1, | |
163 | [PCI_D2] = ACPI_STATE_D2, | |
fc6504b3 RW |
164 | [PCI_D3hot] = ACPI_STATE_D3_COLD, |
165 | [PCI_D3cold] = ACPI_STATE_D3_COLD, | |
b913100d | 166 | }; |
44e4e66e | 167 | int error = -EINVAL; |
b913100d | 168 | |
10b3dcae | 169 | /* If the ACPI device has _EJ0, ignore the device */ |
85dbb3d0 | 170 | if (!adev || acpi_has_method(adev->handle, "_EJ0")) |
44e4e66e | 171 | return -ENODEV; |
583c377f DB |
172 | |
173 | switch (state) { | |
8b713a88 RW |
174 | case PCI_D3cold: |
175 | if (dev_pm_qos_flags(&dev->dev, PM_QOS_FLAG_NO_POWER_OFF) == | |
176 | PM_QOS_FLAGS_ALL) { | |
177 | error = -EBUSY; | |
178 | break; | |
179 | } | |
583c377f DB |
180 | case PCI_D0: |
181 | case PCI_D1: | |
182 | case PCI_D2: | |
183 | case PCI_D3hot: | |
85dbb3d0 | 184 | error = acpi_device_set_power(adev, state_conv[state]); |
583c377f | 185 | } |
44e4e66e RW |
186 | |
187 | if (!error) | |
d010e576 | 188 | dev_dbg(&dev->dev, "power state changed by ACPI to %s\n", |
fc6504b3 | 189 | acpi_power_state_string(state_conv[state])); |
44e4e66e RW |
190 | |
191 | return error; | |
b913100d DSL |
192 | } |
193 | ||
eb9d0fe4 RW |
194 | static bool acpi_pci_can_wakeup(struct pci_dev *dev) |
195 | { | |
85dbb3d0 RW |
196 | struct acpi_device *adev = ACPI_COMPANION(&dev->dev); |
197 | return adev ? acpi_device_can_wakeup(adev) : false; | |
eb9d0fe4 RW |
198 | } |
199 | ||
0baed8da RW |
200 | static void acpi_pci_propagate_wakeup_enable(struct pci_bus *bus, bool enable) |
201 | { | |
202 | while (bus->parent) { | |
dc1a94ae | 203 | if (!acpi_pm_device_sleep_wake(&bus->self->dev, enable)) |
0baed8da RW |
204 | return; |
205 | bus = bus->parent; | |
206 | } | |
207 | ||
208 | /* We have reached the root bus. */ | |
209 | if (bus->bridge) | |
210 | acpi_pm_device_sleep_wake(bus->bridge, enable); | |
211 | } | |
212 | ||
eb9d0fe4 RW |
213 | static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable) |
214 | { | |
0baed8da RW |
215 | if (acpi_pci_can_wakeup(dev)) |
216 | return acpi_pm_device_sleep_wake(&dev->dev, enable); | |
217 | ||
dc1a94ae | 218 | acpi_pci_propagate_wakeup_enable(dev->bus, enable); |
0baed8da | 219 | return 0; |
eb9d0fe4 RW |
220 | } |
221 | ||
b67ea761 RW |
222 | static void acpi_pci_propagate_run_wake(struct pci_bus *bus, bool enable) |
223 | { | |
224 | while (bus->parent) { | |
225 | struct pci_dev *bridge = bus->self; | |
226 | ||
227 | if (bridge->pme_interrupt) | |
228 | return; | |
b24e5098 | 229 | if (!acpi_pm_device_run_wake(&bridge->dev, enable)) |
b67ea761 RW |
230 | return; |
231 | bus = bus->parent; | |
232 | } | |
233 | ||
234 | /* We have reached the root bus. */ | |
235 | if (bus->bridge) | |
b24e5098 | 236 | acpi_pm_device_run_wake(bus->bridge, enable); |
b67ea761 RW |
237 | } |
238 | ||
239 | static int acpi_pci_run_wake(struct pci_dev *dev, bool enable) | |
240 | { | |
448bd857 HY |
241 | /* |
242 | * Per PCI Express Base Specification Revision 2.0 section | |
243 | * 5.3.3.2 Link Wakeup, platform support is needed for D3cold | |
244 | * waking up to power on the main link even if there is PME | |
245 | * support for D3cold | |
246 | */ | |
247 | if (dev->pme_interrupt && !dev->runtime_d3cold) | |
b67ea761 RW |
248 | return 0; |
249 | ||
b24e5098 | 250 | if (!acpi_pm_device_run_wake(&dev->dev, enable)) |
b67ea761 RW |
251 | return 0; |
252 | ||
253 | acpi_pci_propagate_run_wake(dev->bus, enable); | |
254 | return 0; | |
255 | } | |
256 | ||
961d9120 RW |
257 | static struct pci_platform_pm_ops acpi_pci_platform_pm = { |
258 | .is_manageable = acpi_pci_power_manageable, | |
259 | .set_state = acpi_pci_set_power_state, | |
260 | .choose_state = acpi_pci_choose_state, | |
eb9d0fe4 | 261 | .sleep_wake = acpi_pci_sleep_wake, |
b67ea761 | 262 | .run_wake = acpi_pci_run_wake, |
961d9120 | 263 | }; |
b913100d | 264 | |
5090d4a6 JL |
265 | void acpi_pci_add_bus(struct pci_bus *bus) |
266 | { | |
be1c9de9 | 267 | if (acpi_pci_disabled || !bus->bridge) |
5090d4a6 JL |
268 | return; |
269 | ||
be1c9de9 RW |
270 | acpi_pci_slot_enumerate(bus); |
271 | acpiphp_enumerate_slots(bus); | |
5090d4a6 JL |
272 | } |
273 | ||
274 | void acpi_pci_remove_bus(struct pci_bus *bus) | |
275 | { | |
be1c9de9 | 276 | if (acpi_pci_disabled || !bus->bridge) |
5090d4a6 JL |
277 | return; |
278 | ||
3b63aaa7 | 279 | acpiphp_remove_slots(bus); |
5c0b04e3 | 280 | acpi_pci_slot_remove(bus); |
5090d4a6 JL |
281 | } |
282 | ||
84df749f | 283 | /* ACPI bus type */ |
e3f02c52 | 284 | static struct acpi_device *acpi_pci_find_companion(struct device *dev) |
84df749f | 285 | { |
60f75b8e | 286 | struct pci_dev *pci_dev = to_pci_dev(dev); |
5ce79d20 | 287 | bool check_children; |
60f75b8e | 288 | u64 addr; |
84df749f | 289 | |
6788a51f | 290 | check_children = pci_is_bridge(pci_dev); |
84df749f DSL |
291 | /* Please ref to ACPI spec for the syntax of _ADR */ |
292 | addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn); | |
e3f02c52 | 293 | return acpi_find_child_device(ACPI_COMPANION(dev->parent), addr, |
5ce79d20 | 294 | check_children); |
84df749f DSL |
295 | } |
296 | ||
38a9a67a | 297 | static void pci_acpi_setup(struct device *dev) |
d2e5f0c1 | 298 | { |
d2e5f0c1 | 299 | struct pci_dev *pci_dev = to_pci_dev(dev); |
f084280c | 300 | struct acpi_device *adev = ACPI_COMPANION(dev); |
38a9a67a | 301 | |
f084280c RW |
302 | if (!adev) |
303 | return; | |
304 | ||
305 | pci_acpi_add_pm_notifier(adev, pci_dev); | |
306 | if (!adev->wakeup.flags.valid) | |
d2e5f0c1 RW |
307 | return; |
308 | ||
309 | device_set_wakeup_capable(dev, true); | |
310 | acpi_pci_sleep_wake(pci_dev, false); | |
d2e5f0c1 RW |
311 | if (adev->wakeup.flags.run_wake) |
312 | device_set_run_wake(dev, true); | |
313 | } | |
314 | ||
38a9a67a | 315 | static void pci_acpi_cleanup(struct device *dev) |
d2e5f0c1 | 316 | { |
f084280c RW |
317 | struct acpi_device *adev = ACPI_COMPANION(dev); |
318 | ||
319 | if (!adev) | |
320 | return; | |
d2e5f0c1 | 321 | |
f084280c RW |
322 | pci_acpi_remove_pm_notifier(adev); |
323 | if (adev->wakeup.flags.valid) { | |
d2e5f0c1 RW |
324 | device_set_wakeup_capable(dev, false); |
325 | device_set_run_wake(dev, false); | |
d2e5f0c1 RW |
326 | } |
327 | } | |
328 | ||
53540098 RW |
329 | static bool pci_acpi_bus_match(struct device *dev) |
330 | { | |
40c368c1 | 331 | return dev_is_pci(dev); |
53540098 RW |
332 | } |
333 | ||
9c273b95 | 334 | static struct acpi_bus_type acpi_pci_bus = { |
53540098 RW |
335 | .name = "PCI", |
336 | .match = pci_acpi_bus_match, | |
e3f02c52 | 337 | .find_companion = acpi_pci_find_companion, |
38a9a67a RW |
338 | .setup = pci_acpi_setup, |
339 | .cleanup = pci_acpi_cleanup, | |
84df749f DSL |
340 | }; |
341 | ||
9c273b95 | 342 | static int __init acpi_pci_init(void) |
84df749f DSL |
343 | { |
344 | int ret; | |
345 | ||
993958fe | 346 | if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_MSI) { |
e7d45152 | 347 | pr_info("ACPI FADT declares the system doesn't support MSI, so disable it\n"); |
f8993aff SL |
348 | pci_no_msi(); |
349 | } | |
5fde244d | 350 | |
993958fe | 351 | if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) { |
e7d45152 | 352 | pr_info("ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n"); |
5fde244d SL |
353 | pcie_no_aspm(); |
354 | } | |
355 | ||
9c273b95 | 356 | ret = register_acpi_bus_type(&acpi_pci_bus); |
84df749f DSL |
357 | if (ret) |
358 | return 0; | |
5c0b04e3 | 359 | |
961d9120 | 360 | pci_set_platform_pm(&acpi_pci_platform_pm); |
5c0b04e3 | 361 | acpi_pci_slot_init(); |
3b63aaa7 | 362 | acpiphp_init(); |
5c0b04e3 | 363 | |
84df749f DSL |
364 | return 0; |
365 | } | |
9c273b95 | 366 | arch_initcall(acpi_pci_init); |