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