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