drivers/acpi/sleep/main.c

   1 /*
   2  * sleep.c - ACPI sleep support.
   3  *
   4  * Copyright (c) 2000-2003 Patrick Mochel
   5  * Copyright (c) 2003 Open Source Development Lab
   6  *
   7  * This file is released under the GPLv2.
   8  *
   9  */
  10
  11 #include <linux/delay.h>
  12 #include <linux/irq.h>
  13 #include <linux/device.h>
  14 #include <linux/suspend.h>
  15 #include <acpi/acpi_bus.h>
  16 #include <acpi/acpi_drivers.h>
  17 #include "sleep.h"
  18
  19 u8 sleep_states[ACPI_S_STATE_COUNT];
  20
  21 static struct pm_ops acpi_pm_ops;
  22
  23 extern void do_suspend_lowlevel_s4bios(void);
  24 extern void do_suspend_lowlevel(void);
  25
  26 static u32 acpi_suspend_states[] = {
  27         [PM_SUSPEND_ON]         = ACPI_STATE_S0,
  28         [PM_SUSPEND_STANDBY]    = ACPI_STATE_S1,
  29         [PM_SUSPEND_MEM]        = ACPI_STATE_S3,
  30         [PM_SUSPEND_DISK]       = ACPI_STATE_S4,
  31 };
  32
  33 /**
  34  *      acpi_pm_prepare - Do preliminary suspend work.
  35  *      @state:         suspend state we're entering.
  36  *
  37  *      Make sure we support the state. If we do, and we need it, set the
  38  *      firmware waking vector and do arch-specific nastiness to get the
  39  *      wakeup code to the waking vector.
  40  */
  41
  42 static int acpi_pm_prepare(u32 state)
  43 {
  44         u32 acpi_state = acpi_suspend_states[state];
  45
  46         if (!sleep_states[acpi_state])
  47                 return -EPERM;
  48
  49         /* do we have a wakeup address for S2 and S3? */
  50         /* Here, we support only S4BIOS, those we set the wakeup address */
  51         /* S4OS is only supported for now via swsusp.. */
  52         if (state == PM_SUSPEND_MEM || state == PM_SUSPEND_DISK) {
  53                 if (!acpi_wakeup_address)
  54                         return -EFAULT;
  55                 acpi_set_firmware_waking_vector(
  56                         (acpi_physical_address) acpi_wakeup_address);
  57         }
  58         ACPI_FLUSH_CPU_CACHE();
  59         acpi_enter_sleep_state_prep(acpi_state);
  60         return 0;
  61 }
  62
  63
  64 /**
  65  *      acpi_pm_enter - Actually enter a sleep state.
  66  *      @state:         State we're entering.
  67  *
  68  *      Flush caches and go to sleep. For STR or STD, we have to call
  69  *      arch-specific assembly, which in turn call acpi_enter_sleep_state().
  70  *      It's unfortunate, but it works. Please fix if you're feeling frisky.
  71  */
  72
  73 static int acpi_pm_enter(u32 state)
  74 {
  75         acpi_status status = AE_OK;
  76         unsigned long flags = 0;
  77         u32 acpi_state = acpi_suspend_states[state];
  78
  79         ACPI_FLUSH_CPU_CACHE();
  80
  81         /* Do arch specific saving of state. */
  82         if (state > PM_SUSPEND_STANDBY) {
  83                 int error = acpi_save_state_mem();
  84                 if (error)
  85                         return error;
  86         }
  87
  88
  89         local_irq_save(flags);
  90         switch (state)
  91         {
  92         case PM_SUSPEND_STANDBY:
  93                 barrier();
  94                 status = acpi_enter_sleep_state(acpi_state);
  95                 break;
  96
  97         case PM_SUSPEND_MEM:
  98                 do_suspend_lowlevel();
  99                 break;
 100
 101         case PM_SUSPEND_DISK:
 102                 if (acpi_pm_ops.pm_disk_mode == PM_DISK_PLATFORM)
 103                         status = acpi_enter_sleep_state(acpi_state);
 104                 else
 105                         do_suspend_lowlevel_s4bios();
 106                 break;
 107         default:
 108                 return -EINVAL;
 109         }
 110         local_irq_restore(flags);
 111         printk(KERN_DEBUG "Back to C!\n");
 112
 113         /* restore processor state
 114          * We should only be here if we're coming back from STR or STD.
 115          * And, in the case of the latter, the memory image should have already
 116          * been loaded from disk.
 117          */
 118         if (state > PM_SUSPEND_STANDBY)
 119                 acpi_restore_state_mem();
 120
 121
 122         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 123 }
 124
 125
 126 /**
 127  *      acpi_pm_finish - Finish up suspend sequence.
 128  *      @state:         State we're coming out of.
 129  *
 130  *      This is called after we wake back up (or if entering the sleep state
 131  *      failed).
 132  */
 133
 134 static int acpi_pm_finish(u32 state)
 135 {
 136         acpi_leave_sleep_state(state);
 137
 138         /* reset firmware waking vector */
 139         acpi_set_firmware_waking_vector((acpi_physical_address) 0);
 140
 141         if (dmi_broken & BROKEN_INIT_AFTER_S1) {
 142                 printk("Broken toshiba laptop -> kicking interrupts\n");
 143                 init_8259A(0);
 144         }
 145         return 0;
 146 }
 147
 148
 149 int acpi_suspend(u32 acpi_state)
 150 {
 151         u32 states[] = {
 152                 [1]     = PM_SUSPEND_STANDBY,
 153                 [3]     = PM_SUSPEND_MEM,
 154                 [4]     = PM_SUSPEND_DISK,
 155         };
 156
 157         if (acpi_state <= 4 && states[acpi_state])
 158                 return pm_suspend(states[acpi_state]);
 159         return -EINVAL;
 160 }
 161
 162
 163 static struct pm_ops acpi_pm_ops = {
 164         .prepare        = acpi_pm_prepare,
 165         .enter          = acpi_pm_enter,
 166         .finish         = acpi_pm_finish,
 167 };
 168
 169 static int __init acpi_sleep_init(void)
 170 {
 171         int                     i = 0;
 172
 173         if (acpi_disabled)
 174                 return 0;
 175
 176         printk(KERN_INFO PREFIX "(supports");
 177         for (i=0; i<ACPI_S_STATE_COUNT; i++) {
 178                 acpi_status status;
 179                 u8 type_a, type_b;
 180                 status = acpi_get_sleep_type_data(i, &type_a, &type_b);
 181                 if (ACPI_SUCCESS(status)) {
 182                         sleep_states[i] = 1;
 183                         printk(" S%d", i);
 184                 }
 185                 if (i == ACPI_STATE_S4) {
 186                         if (acpi_gbl_FACS->S4bios_f) {
 187                                 sleep_states[i] = 1;
 188                                 printk(" S4bios");
 189                                 acpi_pm_ops.pm_disk_mode = PM_DISK_FIRMWARE;
 190                         } else if (sleep_states[i])
 191                                 acpi_pm_ops.pm_disk_mode = PM_DISK_PLATFORM;
 192                 }
 193         }
 194         printk(")\n");
 195
 196         pm_set_ops(&acpi_pm_ops);
 197         return 0;
 198 }
 199
 200 late_initcall(acpi_sleep_init);