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