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1da177e4 LT |
1 | /* |
2 | * sleep.c - ACPI sleep support. | |
3 | * | |
e2a5b420 | 4 | * Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com> |
1da177e4 LT |
5 | * Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com> |
6 | * Copyright (c) 2000-2003 Patrick Mochel | |
7 | * Copyright (c) 2003 Open Source Development Lab | |
8 | * | |
9 | * This file is released under the GPLv2. | |
10 | * | |
11 | */ | |
12 | ||
13 | #include <linux/delay.h> | |
14 | #include <linux/irq.h> | |
15 | #include <linux/dmi.h> | |
16 | #include <linux/device.h> | |
17 | #include <linux/suspend.h> | |
1da177e4 LT |
18 | #include <acpi/acpi_bus.h> |
19 | #include <acpi/acpi_drivers.h> | |
20 | #include "sleep.h" | |
21 | ||
22 | u8 sleep_states[ACPI_S_STATE_COUNT]; | |
23 | ||
296699de RW |
24 | static u32 acpi_target_sleep_state = ACPI_STATE_S0; |
25 | ||
26 | #ifdef CONFIG_SUSPEND | |
1da177e4 LT |
27 | static struct pm_ops acpi_pm_ops; |
28 | ||
1da177e4 LT |
29 | extern void do_suspend_lowlevel(void); |
30 | ||
31 | static u32 acpi_suspend_states[] = { | |
e2a5b420 AS |
32 | [PM_SUSPEND_ON] = ACPI_STATE_S0, |
33 | [PM_SUSPEND_STANDBY] = ACPI_STATE_S1, | |
34 | [PM_SUSPEND_MEM] = ACPI_STATE_S3, | |
e2a5b420 | 35 | [PM_SUSPEND_MAX] = ACPI_STATE_S5 |
1da177e4 LT |
36 | }; |
37 | ||
38 | static int init_8259A_after_S1; | |
39 | ||
e9b3aba8 RW |
40 | /** |
41 | * acpi_pm_set_target - Set the target system sleep state to the state | |
42 | * associated with given @pm_state, if supported. | |
43 | */ | |
44 | ||
45 | static int acpi_pm_set_target(suspend_state_t pm_state) | |
46 | { | |
47 | u32 acpi_state = acpi_suspend_states[pm_state]; | |
48 | int error = 0; | |
49 | ||
50 | if (sleep_states[acpi_state]) { | |
51 | acpi_target_sleep_state = acpi_state; | |
52 | } else { | |
53 | printk(KERN_ERR "ACPI does not support this state: %d\n", | |
54 | pm_state); | |
55 | error = -ENOSYS; | |
56 | } | |
57 | return error; | |
58 | } | |
59 | ||
1da177e4 LT |
60 | /** |
61 | * acpi_pm_prepare - Do preliminary suspend work. | |
e9b3aba8 | 62 | * @pm_state: ignored |
1da177e4 | 63 | * |
e9b3aba8 RW |
64 | * If necessary, set the firmware waking vector and do arch-specific |
65 | * nastiness to get the wakeup code to the waking vector. | |
1da177e4 LT |
66 | */ |
67 | ||
68 | static int acpi_pm_prepare(suspend_state_t pm_state) | |
69 | { | |
e9b3aba8 | 70 | int error = acpi_sleep_prepare(acpi_target_sleep_state); |
1da177e4 | 71 | |
e9b3aba8 RW |
72 | if (error) |
73 | acpi_target_sleep_state = ACPI_STATE_S0; | |
74 | ||
75 | return error; | |
1da177e4 LT |
76 | } |
77 | ||
1da177e4 LT |
78 | /** |
79 | * acpi_pm_enter - Actually enter a sleep state. | |
e9b3aba8 | 80 | * @pm_state: ignored |
1da177e4 | 81 | * |
50ad147a RW |
82 | * Flush caches and go to sleep. For STR we have to call arch-specific |
83 | * assembly, which in turn call acpi_enter_sleep_state(). | |
1da177e4 LT |
84 | * It's unfortunate, but it works. Please fix if you're feeling frisky. |
85 | */ | |
86 | ||
87 | static int acpi_pm_enter(suspend_state_t pm_state) | |
88 | { | |
89 | acpi_status status = AE_OK; | |
90 | unsigned long flags = 0; | |
e9b3aba8 | 91 | u32 acpi_state = acpi_target_sleep_state; |
1da177e4 LT |
92 | |
93 | ACPI_FLUSH_CPU_CACHE(); | |
94 | ||
95 | /* Do arch specific saving of state. */ | |
50ad147a | 96 | if (acpi_state == ACPI_STATE_S3) { |
1da177e4 | 97 | int error = acpi_save_state_mem(); |
e9b3aba8 RW |
98 | |
99 | if (error) { | |
100 | acpi_target_sleep_state = ACPI_STATE_S0; | |
1da177e4 | 101 | return error; |
e9b3aba8 | 102 | } |
1da177e4 LT |
103 | } |
104 | ||
1da177e4 LT |
105 | local_irq_save(flags); |
106 | acpi_enable_wakeup_device(acpi_state); | |
e9b3aba8 RW |
107 | switch (acpi_state) { |
108 | case ACPI_STATE_S1: | |
1da177e4 LT |
109 | barrier(); |
110 | status = acpi_enter_sleep_state(acpi_state); | |
111 | break; | |
112 | ||
e9b3aba8 | 113 | case ACPI_STATE_S3: |
1da177e4 LT |
114 | do_suspend_lowlevel(); |
115 | break; | |
1da177e4 | 116 | } |
872d83d0 AP |
117 | |
118 | /* ACPI 3.0 specs (P62) says that it's the responsabilty | |
119 | * of the OSPM to clear the status bit [ implying that the | |
120 | * POWER_BUTTON event should not reach userspace ] | |
121 | */ | |
122 | if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) | |
123 | acpi_clear_event(ACPI_EVENT_POWER_BUTTON); | |
124 | ||
1da177e4 LT |
125 | local_irq_restore(flags); |
126 | printk(KERN_DEBUG "Back to C!\n"); | |
127 | ||
e9b3aba8 | 128 | /* restore processor state */ |
50ad147a | 129 | if (acpi_state == ACPI_STATE_S3) |
1da177e4 LT |
130 | acpi_restore_state_mem(); |
131 | ||
1da177e4 LT |
132 | return ACPI_SUCCESS(status) ? 0 : -EFAULT; |
133 | } | |
134 | ||
1da177e4 LT |
135 | /** |
136 | * acpi_pm_finish - Finish up suspend sequence. | |
e9b3aba8 | 137 | * @pm_state: ignored |
1da177e4 LT |
138 | * |
139 | * This is called after we wake back up (or if entering the sleep state | |
140 | * failed). | |
141 | */ | |
142 | ||
143 | static int acpi_pm_finish(suspend_state_t pm_state) | |
144 | { | |
e9b3aba8 | 145 | u32 acpi_state = acpi_target_sleep_state; |
1da177e4 LT |
146 | |
147 | acpi_leave_sleep_state(acpi_state); | |
148 | acpi_disable_wakeup_device(acpi_state); | |
149 | ||
150 | /* reset firmware waking vector */ | |
151 | acpi_set_firmware_waking_vector((acpi_physical_address) 0); | |
152 | ||
e9b3aba8 RW |
153 | acpi_target_sleep_state = ACPI_STATE_S0; |
154 | ||
e8b2fd01 | 155 | #ifdef CONFIG_X86 |
1da177e4 LT |
156 | if (init_8259A_after_S1) { |
157 | printk("Broken toshiba laptop -> kicking interrupts\n"); | |
158 | init_8259A(0); | |
159 | } | |
e8b2fd01 | 160 | #endif |
1da177e4 LT |
161 | return 0; |
162 | } | |
163 | ||
eb9289eb SL |
164 | static int acpi_pm_state_valid(suspend_state_t pm_state) |
165 | { | |
e8c9c502 | 166 | u32 acpi_state; |
eb9289eb | 167 | |
e8c9c502 JB |
168 | switch (pm_state) { |
169 | case PM_SUSPEND_ON: | |
170 | case PM_SUSPEND_STANDBY: | |
171 | case PM_SUSPEND_MEM: | |
172 | acpi_state = acpi_suspend_states[pm_state]; | |
173 | ||
174 | return sleep_states[acpi_state]; | |
175 | default: | |
176 | return 0; | |
177 | } | |
eb9289eb SL |
178 | } |
179 | ||
1da177e4 | 180 | static struct pm_ops acpi_pm_ops = { |
eb9289eb | 181 | .valid = acpi_pm_state_valid, |
e9b3aba8 | 182 | .set_target = acpi_pm_set_target, |
e2a5b420 AS |
183 | .prepare = acpi_pm_prepare, |
184 | .enter = acpi_pm_enter, | |
185 | .finish = acpi_pm_finish, | |
1da177e4 LT |
186 | }; |
187 | ||
296699de RW |
188 | /* |
189 | * Toshiba fails to preserve interrupts over S1, reinitialization | |
190 | * of 8259 is needed after S1 resume. | |
191 | */ | |
192 | static int __init init_ints_after_s1(struct dmi_system_id *d) | |
193 | { | |
194 | printk(KERN_WARNING "%s with broken S1 detected.\n", d->ident); | |
195 | init_8259A_after_S1 = 1; | |
196 | return 0; | |
197 | } | |
198 | ||
199 | static struct dmi_system_id __initdata acpisleep_dmi_table[] = { | |
200 | { | |
201 | .callback = init_ints_after_s1, | |
202 | .ident = "Toshiba Satellite 4030cdt", | |
203 | .matches = {DMI_MATCH(DMI_PRODUCT_NAME, "S4030CDT/4.3"),}, | |
204 | }, | |
205 | {}, | |
206 | }; | |
207 | #endif /* CONFIG_SUSPEND */ | |
208 | ||
b0cb1a19 | 209 | #ifdef CONFIG_HIBERNATION |
a3d25c27 RW |
210 | static int acpi_hibernation_prepare(void) |
211 | { | |
212 | return acpi_sleep_prepare(ACPI_STATE_S4); | |
213 | } | |
214 | ||
215 | static int acpi_hibernation_enter(void) | |
216 | { | |
217 | acpi_status status = AE_OK; | |
218 | unsigned long flags = 0; | |
219 | ||
220 | ACPI_FLUSH_CPU_CACHE(); | |
221 | ||
222 | local_irq_save(flags); | |
223 | acpi_enable_wakeup_device(ACPI_STATE_S4); | |
224 | /* This shouldn't return. If it returns, we have a problem */ | |
225 | status = acpi_enter_sleep_state(ACPI_STATE_S4); | |
226 | local_irq_restore(flags); | |
227 | ||
228 | return ACPI_SUCCESS(status) ? 0 : -EFAULT; | |
229 | } | |
230 | ||
231 | static void acpi_hibernation_finish(void) | |
232 | { | |
233 | acpi_leave_sleep_state(ACPI_STATE_S4); | |
234 | acpi_disable_wakeup_device(ACPI_STATE_S4); | |
235 | ||
236 | /* reset firmware waking vector */ | |
237 | acpi_set_firmware_waking_vector((acpi_physical_address) 0); | |
a3d25c27 RW |
238 | } |
239 | ||
a634cc10 RW |
240 | static int acpi_hibernation_pre_restore(void) |
241 | { | |
242 | acpi_status status; | |
243 | ||
244 | status = acpi_hw_disable_all_gpes(); | |
245 | ||
246 | return ACPI_SUCCESS(status) ? 0 : -EFAULT; | |
247 | } | |
248 | ||
249 | static void acpi_hibernation_restore_cleanup(void) | |
250 | { | |
251 | acpi_hw_enable_all_runtime_gpes(); | |
252 | } | |
253 | ||
a3d25c27 RW |
254 | static struct hibernation_ops acpi_hibernation_ops = { |
255 | .prepare = acpi_hibernation_prepare, | |
256 | .enter = acpi_hibernation_enter, | |
257 | .finish = acpi_hibernation_finish, | |
a634cc10 RW |
258 | .pre_restore = acpi_hibernation_pre_restore, |
259 | .restore_cleanup = acpi_hibernation_restore_cleanup, | |
a3d25c27 | 260 | }; |
b0cb1a19 | 261 | #endif /* CONFIG_HIBERNATION */ |
a3d25c27 | 262 | |
296699de RW |
263 | int acpi_suspend(u32 acpi_state) |
264 | { | |
265 | suspend_state_t states[] = { | |
266 | [1] = PM_SUSPEND_STANDBY, | |
267 | [3] = PM_SUSPEND_MEM, | |
268 | [5] = PM_SUSPEND_MAX | |
269 | }; | |
270 | ||
271 | if (acpi_state < 6 && states[acpi_state]) | |
272 | return pm_suspend(states[acpi_state]); | |
273 | if (acpi_state == 4) | |
274 | return hibernate(); | |
275 | return -EINVAL; | |
276 | } | |
277 | ||
fd4aff1a SL |
278 | /** |
279 | * acpi_pm_device_sleep_state - return preferred power state of ACPI device | |
280 | * in the system sleep state given by %acpi_target_sleep_state | |
281 | * @dev: device to examine | |
282 | * @wake: if set, the device should be able to wake up the system | |
283 | * @d_min_p: used to store the upper limit of allowed states range | |
284 | * Return value: preferred power state of the device on success, -ENODEV on | |
285 | * failure (ie. if there's no 'struct acpi_device' for @dev) | |
286 | * | |
287 | * Find the lowest power (highest number) ACPI device power state that | |
288 | * device @dev can be in while the system is in the sleep state represented | |
289 | * by %acpi_target_sleep_state. If @wake is nonzero, the device should be | |
290 | * able to wake up the system from this sleep state. If @d_min_p is set, | |
291 | * the highest power (lowest number) device power state of @dev allowed | |
292 | * in this system sleep state is stored at the location pointed to by it. | |
293 | * | |
294 | * The caller must ensure that @dev is valid before using this function. | |
295 | * The caller is also responsible for figuring out if the device is | |
296 | * supposed to be able to wake up the system and passing this information | |
297 | * via @wake. | |
298 | */ | |
299 | ||
300 | int acpi_pm_device_sleep_state(struct device *dev, int wake, int *d_min_p) | |
301 | { | |
302 | acpi_handle handle = DEVICE_ACPI_HANDLE(dev); | |
303 | struct acpi_device *adev; | |
304 | char acpi_method[] = "_SxD"; | |
305 | unsigned long d_min, d_max; | |
306 | ||
307 | if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) { | |
ead77594 | 308 | printk(KERN_DEBUG "ACPI handle has no context!\n"); |
fd4aff1a SL |
309 | return -ENODEV; |
310 | } | |
311 | ||
312 | acpi_method[2] = '0' + acpi_target_sleep_state; | |
313 | /* | |
314 | * If the sleep state is S0, we will return D3, but if the device has | |
315 | * _S0W, we will use the value from _S0W | |
316 | */ | |
317 | d_min = ACPI_STATE_D0; | |
318 | d_max = ACPI_STATE_D3; | |
319 | ||
320 | /* | |
321 | * If present, _SxD methods return the minimum D-state (highest power | |
322 | * state) we can use for the corresponding S-states. Otherwise, the | |
323 | * minimum D-state is D0 (ACPI 3.x). | |
324 | * | |
325 | * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer | |
326 | * provided -- that's our fault recovery, we ignore retval. | |
327 | */ | |
328 | if (acpi_target_sleep_state > ACPI_STATE_S0) | |
329 | acpi_evaluate_integer(handle, acpi_method, NULL, &d_min); | |
330 | ||
331 | /* | |
332 | * If _PRW says we can wake up the system from the target sleep state, | |
333 | * the D-state returned by _SxD is sufficient for that (we assume a | |
334 | * wakeup-aware driver if wake is set). Still, if _SxW exists | |
335 | * (ACPI 3.x), it should return the maximum (lowest power) D-state that | |
336 | * can wake the system. _S0W may be valid, too. | |
337 | */ | |
338 | if (acpi_target_sleep_state == ACPI_STATE_S0 || | |
339 | (wake && adev->wakeup.state.enabled && | |
340 | adev->wakeup.sleep_state <= acpi_target_sleep_state)) { | |
341 | acpi_method[3] = 'W'; | |
342 | acpi_evaluate_integer(handle, acpi_method, NULL, &d_max); | |
343 | /* Sanity check */ | |
344 | if (d_max < d_min) | |
345 | d_min = d_max; | |
346 | } | |
347 | ||
348 | if (d_min_p) | |
349 | *d_min_p = d_min; | |
350 | return d_max; | |
351 | } | |
352 | ||
aafbcd16 | 353 | int __init acpi_sleep_init(void) |
1da177e4 | 354 | { |
296699de RW |
355 | acpi_status status; |
356 | u8 type_a, type_b; | |
357 | #ifdef CONFIG_SUSPEND | |
e2a5b420 | 358 | int i = 0; |
1da177e4 LT |
359 | |
360 | dmi_check_system(acpisleep_dmi_table); | |
296699de | 361 | #endif |
1da177e4 LT |
362 | |
363 | if (acpi_disabled) | |
364 | return 0; | |
365 | ||
296699de | 366 | #ifdef CONFIG_SUSPEND |
1da177e4 | 367 | printk(KERN_INFO PREFIX "(supports"); |
296699de | 368 | for (i = ACPI_STATE_S0; i < ACPI_STATE_S4; i++) { |
1da177e4 LT |
369 | status = acpi_get_sleep_type_data(i, &type_a, &type_b); |
370 | if (ACPI_SUCCESS(status)) { | |
371 | sleep_states[i] = 1; | |
372 | printk(" S%d", i); | |
373 | } | |
1da177e4 LT |
374 | } |
375 | printk(")\n"); | |
376 | ||
377 | pm_set_ops(&acpi_pm_ops); | |
296699de | 378 | #endif |
a3d25c27 | 379 | |
b0cb1a19 | 380 | #ifdef CONFIG_HIBERNATION |
296699de RW |
381 | status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b); |
382 | if (ACPI_SUCCESS(status)) { | |
a3d25c27 | 383 | hibernation_set_ops(&acpi_hibernation_ops); |
296699de RW |
384 | sleep_states[ACPI_STATE_S4] = 1; |
385 | } | |
a3d25c27 RW |
386 | #else |
387 | sleep_states[ACPI_STATE_S4] = 0; | |
388 | #endif | |
389 | ||
1da177e4 LT |
390 | return 0; |
391 | } |