Pileus Git - ~andy/linux/blob - 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 #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
  24 static struct pm_ops acpi_pm_ops;
  25
  26 extern void do_suspend_lowlevel(void);
  27
  28 static u32 acpi_suspend_states[] = {
  29         [PM_SUSPEND_ON] = ACPI_STATE_S0,
  30         [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
  31         [PM_SUSPEND_MEM] = ACPI_STATE_S3,
  32         [PM_SUSPEND_MAX] = ACPI_STATE_S5
  33 };
  34
  35 static int init_8259A_after_S1;
  36
  37 /**
  38  *      acpi_pm_prepare - Do preliminary suspend work.
  39  *      @pm_state:              suspend state we're entering.
  40  *
  41  *      Make sure we support the state. If we do, and we need it, set the
  42  *      firmware waking vector and do arch-specific nastiness to get the
  43  *      wakeup code to the waking vector.
  44  */
  45
  46 extern int acpi_sleep_prepare(u32 acpi_state);
  47 extern void acpi_power_off(void);
  48
  49 static int acpi_pm_prepare(suspend_state_t pm_state)
  50 {
  51         u32 acpi_state = acpi_suspend_states[pm_state];
  52
  53         if (!sleep_states[acpi_state]) {
  54                 printk("acpi_pm_prepare does not support %d \n", pm_state);
  55                 return -EPERM;
  56         }
  57         return acpi_sleep_prepare(acpi_state);
  58 }
  59
  60 /**
  61  *      acpi_pm_enter - Actually enter a sleep state.
  62  *      @pm_state:              State we're entering.
  63  *
  64  *      Flush caches and go to sleep. For STR or STD, we have to call
  65  *      arch-specific assembly, which in turn call acpi_enter_sleep_state().
  66  *      It's unfortunate, but it works. Please fix if you're feeling frisky.
  67  */
  68
  69 static int acpi_pm_enter(suspend_state_t pm_state)
  70 {
  71         acpi_status status = AE_OK;
  72         unsigned long flags = 0;
  73         u32 acpi_state = acpi_suspend_states[pm_state];
  74
  75         ACPI_FLUSH_CPU_CACHE();
  76
  77         /* Do arch specific saving of state. */
  78         if (pm_state > PM_SUSPEND_STANDBY) {
  79                 int error = acpi_save_state_mem();
  80                 if (error)
  81                         return error;
  82         }
  83
  84         local_irq_save(flags);
  85         acpi_enable_wakeup_device(acpi_state);
  86         switch (pm_state) {
  87         case PM_SUSPEND_STANDBY:
  88                 barrier();
  89                 status = acpi_enter_sleep_state(acpi_state);
  90                 break;
  91
  92         case PM_SUSPEND_MEM:
  93                 do_suspend_lowlevel();
  94                 break;
  95
  96         default:
  97                 return -EINVAL;
  98         }
  99
 100         /* ACPI 3.0 specs (P62) says that it's the responsabilty
 101          * of the OSPM to clear the status bit [ implying that the
 102          * POWER_BUTTON event should not reach userspace ]
 103          */
 104         if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3))
 105                 acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
 106
 107         local_irq_restore(flags);
 108         printk(KERN_DEBUG "Back to C!\n");
 109
 110         /* restore processor state
 111          * We should only be here if we're coming back from STR or STD.
 112          * And, in the case of the latter, the memory image should have already
 113          * been loaded from disk.
 114          */
 115         if (pm_state > PM_SUSPEND_STANDBY)
 116                 acpi_restore_state_mem();
 117
 118         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 119 }
 120
 121 /**
 122  *      acpi_pm_finish - Finish up suspend sequence.
 123  *      @pm_state:              State we're coming out of.
 124  *
 125  *      This is called after we wake back up (or if entering the sleep state
 126  *      failed).
 127  */
 128
 129 static int acpi_pm_finish(suspend_state_t pm_state)
 130 {
 131         u32 acpi_state = acpi_suspend_states[pm_state];
 132
 133         acpi_leave_sleep_state(acpi_state);
 134         acpi_disable_wakeup_device(acpi_state);
 135
 136         /* reset firmware waking vector */
 137         acpi_set_firmware_waking_vector((acpi_physical_address) 0);
 138
 139 #ifdef CONFIG_X86
 140         if (init_8259A_after_S1) {
 141                 printk("Broken toshiba laptop -> kicking interrupts\n");
 142                 init_8259A(0);
 143         }
 144 #endif
 145         return 0;
 146 }
 147
 148 int acpi_suspend(u32 acpi_state)
 149 {
 150         suspend_state_t states[] = {
 151                 [1] = PM_SUSPEND_STANDBY,
 152                 [3] = PM_SUSPEND_MEM,
 153                 [5] = PM_SUSPEND_MAX
 154         };
 155
 156         if (acpi_state < 6 && states[acpi_state])
 157                 return pm_suspend(states[acpi_state]);
 158         if (acpi_state == 4)
 159                 return hibernate();
 160         return -EINVAL;
 161 }
 162
 163 static int acpi_pm_state_valid(suspend_state_t pm_state)
 164 {
 165         u32 acpi_state;
 166
 167         switch (pm_state) {
 168         case PM_SUSPEND_ON:
 169         case PM_SUSPEND_STANDBY:
 170         case PM_SUSPEND_MEM:
 171                 acpi_state = acpi_suspend_states[pm_state];
 172
 173                 return sleep_states[acpi_state];
 174         default:
 175                 return 0;
 176         }
 177 }
 178
 179 static struct pm_ops acpi_pm_ops = {
 180         .valid = acpi_pm_state_valid,
 181         .prepare = acpi_pm_prepare,
 182         .enter = acpi_pm_enter,
 183         .finish = acpi_pm_finish,
 184 };
 185
 186 #ifdef CONFIG_SOFTWARE_SUSPEND
 187 static int acpi_hibernation_prepare(void)
 188 {
 189         return acpi_sleep_prepare(ACPI_STATE_S4);
 190 }
 191
 192 static int acpi_hibernation_enter(void)
 193 {
 194         acpi_status status = AE_OK;
 195         unsigned long flags = 0;
 196
 197         ACPI_FLUSH_CPU_CACHE();
 198
 199         local_irq_save(flags);
 200         acpi_enable_wakeup_device(ACPI_STATE_S4);
 201         /* This shouldn't return.  If it returns, we have a problem */
 202         status = acpi_enter_sleep_state(ACPI_STATE_S4);
 203         local_irq_restore(flags);
 204
 205         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 206 }
 207
 208 static void acpi_hibernation_finish(void)
 209 {
 210         acpi_leave_sleep_state(ACPI_STATE_S4);
 211         acpi_disable_wakeup_device(ACPI_STATE_S4);
 212
 213         /* reset firmware waking vector */
 214         acpi_set_firmware_waking_vector((acpi_physical_address) 0);
 215 }
 216
 217 static int acpi_hibernation_pre_restore(void)
 218 {
 219         acpi_status status;
 220
 221         status = acpi_hw_disable_all_gpes();
 222
 223         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 224 }
 225
 226 static void acpi_hibernation_restore_cleanup(void)
 227 {
 228         acpi_hw_enable_all_runtime_gpes();
 229 }
 230
 231 static struct hibernation_ops acpi_hibernation_ops = {
 232         .prepare = acpi_hibernation_prepare,
 233         .enter = acpi_hibernation_enter,
 234         .finish = acpi_hibernation_finish,
 235         .pre_restore = acpi_hibernation_pre_restore,
 236         .restore_cleanup = acpi_hibernation_restore_cleanup,
 237 };
 238 #endif                          /* CONFIG_SOFTWARE_SUSPEND */
 239
 240 /*
 241  * Toshiba fails to preserve interrupts over S1, reinitialization
 242  * of 8259 is needed after S1 resume.
 243  */
 244 static int __init init_ints_after_s1(struct dmi_system_id *d)
 245 {
 246         printk(KERN_WARNING "%s with broken S1 detected.\n", d->ident);
 247         init_8259A_after_S1 = 1;
 248         return 0;
 249 }
 250
 251 static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
 252         {
 253          .callback = init_ints_after_s1,
 254          .ident = "Toshiba Satellite 4030cdt",
 255          .matches = {DMI_MATCH(DMI_PRODUCT_NAME, "S4030CDT/4.3"),},
 256          },
 257         {},
 258 };
 259
 260 int __init acpi_sleep_init(void)
 261 {
 262         int i = 0;
 263
 264         dmi_check_system(acpisleep_dmi_table);
 265
 266         if (acpi_disabled)
 267                 return 0;
 268
 269         printk(KERN_INFO PREFIX "(supports");
 270         for (i = 0; i < ACPI_S_STATE_COUNT; i++) {
 271                 acpi_status status;
 272                 u8 type_a, type_b;
 273                 status = acpi_get_sleep_type_data(i, &type_a, &type_b);
 274                 if (ACPI_SUCCESS(status)) {
 275                         sleep_states[i] = 1;
 276                         printk(" S%d", i);
 277                 }
 278         }
 279         printk(")\n");
 280
 281         pm_set_ops(&acpi_pm_ops);
 282
 283 #ifdef CONFIG_SOFTWARE_SUSPEND
 284         if (sleep_states[ACPI_STATE_S4])
 285                 hibernation_set_ops(&acpi_hibernation_ops);
 286 #else
 287         sleep_states[ACPI_STATE_S4] = 0;
 288 #endif
 289
 290         return 0;
 291 }