drivers/acpi/sleep/main.c

   1 /*
   2  * sleep.c - ACPI sleep support.
   3  *
   4  * Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
   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>
  18
  19 #include <asm/io.h>
  20
  21 #include <acpi/acpi_bus.h>
  22 #include <acpi/acpi_drivers.h>
  23 #include "sleep.h"
  24
  25 u8 sleep_states[ACPI_S_STATE_COUNT];
  26
  27 #ifdef CONFIG_PM_SLEEP
  28 static u32 acpi_target_sleep_state = ACPI_STATE_S0;
  29 static bool acpi_sleep_finish_wake_up;
  30
  31 /*
  32  * ACPI 2.0 and later want us to execute _PTS after suspending devices, so we
  33  * allow the user to request that behavior by using the 'acpi_new_pts_ordering'
  34  * kernel command line option that causes the following variable to be set.
  35  */
  36 static bool new_pts_ordering;
  37
  38 static int __init acpi_new_pts_ordering(char *str)
  39 {
  40         new_pts_ordering = true;
  41         return 1;
  42 }
  43 __setup("acpi_new_pts_ordering", acpi_new_pts_ordering);
  44 #endif
  45
  46 int acpi_sleep_prepare(u32 acpi_state)
  47 {
  48 #ifdef CONFIG_ACPI_SLEEP
  49         /* do we have a wakeup address for S2 and S3? */
  50         if (acpi_state == ACPI_STATE_S3) {
  51                 if (!acpi_wakeup_address) {
  52                         return -EFAULT;
  53                 }
  54                 acpi_set_firmware_waking_vector((acpi_physical_address)
  55                                                 virt_to_phys((void *)
  56                                                              acpi_wakeup_address));
  57
  58         }
  59         ACPI_FLUSH_CPU_CACHE();
  60         acpi_enable_wakeup_device_prep(acpi_state);
  61 #endif
  62         acpi_enter_sleep_state_prep(acpi_state);
  63         return 0;
  64 }
  65
  66 #ifdef CONFIG_SUSPEND
  67 static struct platform_suspend_ops acpi_pm_ops;
  68
  69 extern void do_suspend_lowlevel(void);
  70
  71 static u32 acpi_suspend_states[] = {
  72         [PM_SUSPEND_ON] = ACPI_STATE_S0,
  73         [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
  74         [PM_SUSPEND_MEM] = ACPI_STATE_S3,
  75         [PM_SUSPEND_MAX] = ACPI_STATE_S5
  76 };
  77
  78 static int init_8259A_after_S1;
  79
  80 /**
  81  *      acpi_pm_begin - Set the target system sleep state to the state
  82  *              associated with given @pm_state, if supported.
  83  */
  84
  85 static int acpi_pm_begin(suspend_state_t pm_state)
  86 {
  87         u32 acpi_state = acpi_suspend_states[pm_state];
  88         int error = 0;
  89
  90         if (sleep_states[acpi_state]) {
  91                 acpi_target_sleep_state = acpi_state;
  92                 if (new_pts_ordering)
  93                         return 0;
  94
  95                 error = acpi_sleep_prepare(acpi_state);
  96                 if (error)
  97                         acpi_target_sleep_state = ACPI_STATE_S0;
  98                 else
  99                         acpi_sleep_finish_wake_up = true;
 100         } else {
 101                 printk(KERN_ERR "ACPI does not support this state: %d\n",
 102                         pm_state);
 103                 error = -ENOSYS;
 104         }
 105         return error;
 106 }
 107
 108 /**
 109  *      acpi_pm_prepare - Do preliminary suspend work.
 110  *
 111  *      If necessary, set the firmware waking vector and do arch-specific
 112  *      nastiness to get the wakeup code to the waking vector.
 113  */
 114
 115 static int acpi_pm_prepare(void)
 116 {
 117         if (new_pts_ordering) {
 118                 int error = acpi_sleep_prepare(acpi_target_sleep_state);
 119
 120                 if (error) {
 121                         acpi_target_sleep_state = ACPI_STATE_S0;
 122                         return error;
 123                 }
 124                 acpi_sleep_finish_wake_up = true;
 125         }
 126
 127         return ACPI_SUCCESS(acpi_hw_disable_all_gpes()) ? 0 : -EFAULT;
 128 }
 129
 130 /**
 131  *      acpi_pm_enter - Actually enter a sleep state.
 132  *      @pm_state: ignored
 133  *
 134  *      Flush caches and go to sleep. For STR we have to call arch-specific
 135  *      assembly, which in turn call acpi_enter_sleep_state().
 136  *      It's unfortunate, but it works. Please fix if you're feeling frisky.
 137  */
 138
 139 static int acpi_pm_enter(suspend_state_t pm_state)
 140 {
 141         acpi_status status = AE_OK;
 142         unsigned long flags = 0;
 143         u32 acpi_state = acpi_target_sleep_state;
 144
 145         ACPI_FLUSH_CPU_CACHE();
 146
 147         /* Do arch specific saving of state. */
 148         if (acpi_state == ACPI_STATE_S3) {
 149                 int error = acpi_save_state_mem();
 150
 151                 if (error)
 152                         return error;
 153         }
 154
 155         local_irq_save(flags);
 156         acpi_enable_wakeup_device(acpi_state);
 157         switch (acpi_state) {
 158         case ACPI_STATE_S1:
 159                 barrier();
 160                 status = acpi_enter_sleep_state(acpi_state);
 161                 break;
 162
 163         case ACPI_STATE_S3:
 164                 do_suspend_lowlevel();
 165                 break;
 166         }
 167
 168         /* Reprogram control registers and execute _BFS */
 169         acpi_leave_sleep_state_prep(acpi_state);
 170
 171         /* ACPI 3.0 specs (P62) says that it's the responsabilty
 172          * of the OSPM to clear the status bit [ implying that the
 173          * POWER_BUTTON event should not reach userspace ]
 174          */
 175         if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3))
 176                 acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
 177
 178         /*
 179          * Disable and clear GPE status before interrupt is enabled. Some GPEs
 180          * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
 181          * acpi_leave_sleep_state will reenable specific GPEs later
 182          */
 183         acpi_hw_disable_all_gpes();
 184
 185         local_irq_restore(flags);
 186         printk(KERN_DEBUG "Back to C!\n");
 187
 188         /* restore processor state */
 189         if (acpi_state == ACPI_STATE_S3)
 190                 acpi_restore_state_mem();
 191
 192         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 193 }
 194
 195 /**
 196  *      acpi_pm_finish - Instruct the platform to leave a sleep state.
 197  *
 198  *      This is called after we wake back up (or if entering the sleep state
 199  *      failed).
 200  */
 201
 202 static void acpi_pm_finish(void)
 203 {
 204         u32 acpi_state = acpi_target_sleep_state;
 205
 206         acpi_disable_wakeup_device(acpi_state);
 207         acpi_leave_sleep_state(acpi_state);
 208
 209         /* reset firmware waking vector */
 210         acpi_set_firmware_waking_vector((acpi_physical_address) 0);
 211
 212         acpi_target_sleep_state = ACPI_STATE_S0;
 213         acpi_sleep_finish_wake_up = false;
 214
 215 #ifdef CONFIG_X86
 216         if (init_8259A_after_S1) {
 217                 printk("Broken toshiba laptop -> kicking interrupts\n");
 218                 init_8259A(0);
 219         }
 220 #endif
 221 }
 222
 223 /**
 224  *      acpi_pm_end - Finish up suspend sequence.
 225  */
 226
 227 static void acpi_pm_end(void)
 228 {
 229         /*
 230          * This is necessary in case acpi_pm_finish() is not called directly
 231          * during a failing transition to a sleep state.
 232          */
 233         if (acpi_sleep_finish_wake_up)
 234                 acpi_pm_finish();
 235 }
 236
 237 static int acpi_pm_state_valid(suspend_state_t pm_state)
 238 {
 239         u32 acpi_state;
 240
 241         switch (pm_state) {
 242         case PM_SUSPEND_ON:
 243         case PM_SUSPEND_STANDBY:
 244         case PM_SUSPEND_MEM:
 245                 acpi_state = acpi_suspend_states[pm_state];
 246
 247                 return sleep_states[acpi_state];
 248         default:
 249                 return 0;
 250         }
 251 }
 252
 253 static struct platform_suspend_ops acpi_pm_ops = {
 254         .valid = acpi_pm_state_valid,
 255         .begin = acpi_pm_begin,
 256         .prepare = acpi_pm_prepare,
 257         .enter = acpi_pm_enter,
 258         .finish = acpi_pm_finish,
 259         .end = acpi_pm_end,
 260 };
 261
 262 /*
 263  * Toshiba fails to preserve interrupts over S1, reinitialization
 264  * of 8259 is needed after S1 resume.
 265  */
 266 static int __init init_ints_after_s1(const struct dmi_system_id *d)
 267 {
 268         printk(KERN_WARNING "%s with broken S1 detected.\n", d->ident);
 269         init_8259A_after_S1 = 1;
 270         return 0;
 271 }
 272
 273 static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
 274         {
 275          .callback = init_ints_after_s1,
 276          .ident = "Toshiba Satellite 4030cdt",
 277          .matches = {DMI_MATCH(DMI_PRODUCT_NAME, "S4030CDT/4.3"),},
 278          },
 279         {},
 280 };
 281 #endif /* CONFIG_SUSPEND */
 282
 283 #ifdef CONFIG_HIBERNATION
 284 static int acpi_hibernation_start(void)
 285 {
 286         acpi_target_sleep_state = ACPI_STATE_S4;
 287         return 0;
 288 }
 289
 290 static int acpi_hibernation_prepare(void)
 291 {
 292         int error;
 293
 294         error = acpi_sleep_prepare(ACPI_STATE_S4);
 295         if (error)
 296                 return error;
 297
 298         if (!ACPI_SUCCESS(acpi_hw_disable_all_gpes()))
 299                 error = -EFAULT;
 300
 301         return error;
 302 }
 303
 304 static int acpi_hibernation_enter(void)
 305 {
 306         acpi_status status = AE_OK;
 307         unsigned long flags = 0;
 308
 309         ACPI_FLUSH_CPU_CACHE();
 310
 311         local_irq_save(flags);
 312         acpi_enable_wakeup_device(ACPI_STATE_S4);
 313         /* This shouldn't return.  If it returns, we have a problem */
 314         status = acpi_enter_sleep_state(ACPI_STATE_S4);
 315         /* Reprogram control registers and execute _BFS */
 316         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
 317         local_irq_restore(flags);
 318
 319         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 320 }
 321
 322 static void acpi_hibernation_leave(void)
 323 {
 324         /*
 325          * If ACPI is not enabled by the BIOS and the boot kernel, we need to
 326          * enable it here.
 327          */
 328         acpi_enable();
 329         /* Reprogram control registers and execute _BFS */
 330         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
 331 }
 332
 333 static void acpi_hibernation_finish(void)
 334 {
 335         acpi_disable_wakeup_device(ACPI_STATE_S4);
 336         acpi_leave_sleep_state(ACPI_STATE_S4);
 337
 338         /* reset firmware waking vector */
 339         acpi_set_firmware_waking_vector((acpi_physical_address) 0);
 340
 341         acpi_target_sleep_state = ACPI_STATE_S0;
 342 }
 343
 344 static int acpi_hibernation_pre_restore(void)
 345 {
 346         acpi_status status;
 347
 348         status = acpi_hw_disable_all_gpes();
 349
 350         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 351 }
 352
 353 static void acpi_hibernation_restore_cleanup(void)
 354 {
 355         acpi_hw_enable_all_runtime_gpes();
 356 }
 357
 358 static struct platform_hibernation_ops acpi_hibernation_ops = {
 359         .start = acpi_hibernation_start,
 360         .pre_snapshot = acpi_hibernation_prepare,
 361         .finish = acpi_hibernation_finish,
 362         .prepare = acpi_hibernation_prepare,
 363         .enter = acpi_hibernation_enter,
 364         .leave = acpi_hibernation_leave,
 365         .pre_restore = acpi_hibernation_pre_restore,
 366         .restore_cleanup = acpi_hibernation_restore_cleanup,
 367 };
 368 #endif                          /* CONFIG_HIBERNATION */
 369
 370 int acpi_suspend(u32 acpi_state)
 371 {
 372         suspend_state_t states[] = {
 373                 [1] = PM_SUSPEND_STANDBY,
 374                 [3] = PM_SUSPEND_MEM,
 375                 [5] = PM_SUSPEND_MAX
 376         };
 377
 378         if (acpi_state < 6 && states[acpi_state])
 379                 return pm_suspend(states[acpi_state]);
 380         if (acpi_state == 4)
 381                 return hibernate();
 382         return -EINVAL;
 383 }
 384
 385 #ifdef CONFIG_PM_SLEEP
 386 /**
 387  *      acpi_pm_device_sleep_state - return preferred power state of ACPI device
 388  *              in the system sleep state given by %acpi_target_sleep_state
 389  *      @dev: device to examine
 390  *      @wake: if set, the device should be able to wake up the system
 391  *      @d_min_p: used to store the upper limit of allowed states range
 392  *      Return value: preferred power state of the device on success, -ENODEV on
 393  *              failure (ie. if there's no 'struct acpi_device' for @dev)
 394  *
 395  *      Find the lowest power (highest number) ACPI device power state that
 396  *      device @dev can be in while the system is in the sleep state represented
 397  *      by %acpi_target_sleep_state.  If @wake is nonzero, the device should be
 398  *      able to wake up the system from this sleep state.  If @d_min_p is set,
 399  *      the highest power (lowest number) device power state of @dev allowed
 400  *      in this system sleep state is stored at the location pointed to by it.
 401  *
 402  *      The caller must ensure that @dev is valid before using this function.
 403  *      The caller is also responsible for figuring out if the device is
 404  *      supposed to be able to wake up the system and passing this information
 405  *      via @wake.
 406  */
 407
 408 int acpi_pm_device_sleep_state(struct device *dev, int wake, int *d_min_p)
 409 {
 410         acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
 411         struct acpi_device *adev;
 412         char acpi_method[] = "_SxD";
 413         unsigned long d_min, d_max;
 414
 415         if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
 416                 printk(KERN_DEBUG "ACPI handle has no context!\n");
 417                 return -ENODEV;
 418         }
 419
 420         acpi_method[2] = '0' + acpi_target_sleep_state;
 421         /*
 422          * If the sleep state is S0, we will return D3, but if the device has
 423          * _S0W, we will use the value from _S0W
 424          */
 425         d_min = ACPI_STATE_D0;
 426         d_max = ACPI_STATE_D3;
 427
 428         /*
 429          * If present, _SxD methods return the minimum D-state (highest power
 430          * state) we can use for the corresponding S-states.  Otherwise, the
 431          * minimum D-state is D0 (ACPI 3.x).
 432          *
 433          * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
 434          * provided -- that's our fault recovery, we ignore retval.
 435          */
 436         if (acpi_target_sleep_state > ACPI_STATE_S0)
 437                 acpi_evaluate_integer(handle, acpi_method, NULL, &d_min);
 438
 439         /*
 440          * If _PRW says we can wake up the system from the target sleep state,
 441          * the D-state returned by _SxD is sufficient for that (we assume a
 442          * wakeup-aware driver if wake is set).  Still, if _SxW exists
 443          * (ACPI 3.x), it should return the maximum (lowest power) D-state that
 444          * can wake the system.  _S0W may be valid, too.
 445          */
 446         if (acpi_target_sleep_state == ACPI_STATE_S0 ||
 447             (wake && adev->wakeup.state.enabled &&
 448              adev->wakeup.sleep_state <= acpi_target_sleep_state)) {
 449                 acpi_method[3] = 'W';
 450                 acpi_evaluate_integer(handle, acpi_method, NULL, &d_max);
 451                 /* Sanity check */
 452                 if (d_max < d_min)
 453                         d_min = d_max;
 454         }
 455
 456         if (d_min_p)
 457                 *d_min_p = d_min;
 458         return d_max;
 459 }
 460 #endif
 461
 462 static void acpi_power_off_prepare(void)
 463 {
 464         /* Prepare to power off the system */
 465         acpi_sleep_prepare(ACPI_STATE_S5);
 466         acpi_hw_disable_all_gpes();
 467 }
 468
 469 static void acpi_power_off(void)
 470 {
 471         /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
 472         printk("%s called\n", __FUNCTION__);
 473         local_irq_disable();
 474         acpi_enable_wakeup_device(ACPI_STATE_S5);
 475         acpi_enter_sleep_state(ACPI_STATE_S5);
 476 }
 477
 478 int __init acpi_sleep_init(void)
 479 {
 480         acpi_status status;
 481         u8 type_a, type_b;
 482 #ifdef CONFIG_SUSPEND
 483         int i = 0;
 484
 485         dmi_check_system(acpisleep_dmi_table);
 486 #endif
 487
 488         if (acpi_disabled)
 489                 return 0;
 490
 491         sleep_states[ACPI_STATE_S0] = 1;
 492         printk(KERN_INFO PREFIX "(supports S0");
 493
 494 #ifdef CONFIG_SUSPEND
 495         for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) {
 496                 status = acpi_get_sleep_type_data(i, &type_a, &type_b);
 497                 if (ACPI_SUCCESS(status)) {
 498                         sleep_states[i] = 1;
 499                         printk(" S%d", i);
 500                 }
 501         }
 502
 503         suspend_set_ops(&acpi_pm_ops);
 504 #endif
 505
 506 #ifdef CONFIG_HIBERNATION
 507         status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b);
 508         if (ACPI_SUCCESS(status)) {
 509                 hibernation_set_ops(&acpi_hibernation_ops);
 510                 sleep_states[ACPI_STATE_S4] = 1;
 511                 printk(" S4");
 512         }
 513 #endif
 514         status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
 515         if (ACPI_SUCCESS(status)) {
 516                 sleep_states[ACPI_STATE_S5] = 1;
 517                 printk(" S5");
 518                 pm_power_off_prepare = acpi_power_off_prepare;
 519                 pm_power_off = acpi_power_off;
 520         }
 521         printk(")\n");
 522         return 0;
 523 }