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/dmi.h>
  14 #include <linux/device.h>
  15 #include <linux/suspend.h>
  16 #include <acpi/acpi_bus.h>
  17 #include <acpi/acpi_drivers.h>
  18 #include "sleep.h"
  19
  20 u8 sleep_states[ACPI_S_STATE_COUNT];
  21
  22 static struct pm_ops acpi_pm_ops;
  23
  24 extern void do_suspend_lowlevel_s4bios(void);
  25 extern void do_suspend_lowlevel(void);
  26
  27 static u32 acpi_suspend_states[] = {
  28         [PM_SUSPEND_ON]         = ACPI_STATE_S0,
  29         [PM_SUSPEND_STANDBY]    = ACPI_STATE_S1,
  30         [PM_SUSPEND_MEM]        = ACPI_STATE_S3,
  31         [PM_SUSPEND_DISK]       = ACPI_STATE_S4,
  32 };
  33
  34 static int init_8259A_after_S1;
  35
  36 /**
  37  *      acpi_pm_prepare - Do preliminary suspend work.
  38  *      @state:         suspend state we're entering.
  39  *
  40  *      Make sure we support the state. If we do, and we need it, set the
  41  *      firmware waking vector and do arch-specific nastiness to get the
  42  *      wakeup code to the waking vector.
  43  */
  44
  45 static int acpi_pm_prepare(u32 state)
  46 {
  47         u32 acpi_state = acpi_suspend_states[state];
  48
  49         if (!sleep_states[acpi_state])
  50                 return -EPERM;
  51
  52         /* do we have a wakeup address for S2 and S3? */
  53         /* Here, we support only S4BIOS, those we set the wakeup address */
  54         /* S4OS is only supported for now via swsusp.. */
  55         if (state == PM_SUSPEND_MEM || state == PM_SUSPEND_DISK) {
  56                 if (!acpi_wakeup_address)
  57                         return -EFAULT;
  58                 acpi_set_firmware_waking_vector(
  59                         (acpi_physical_address) acpi_wakeup_address);
  60         }
  61         ACPI_FLUSH_CPU_CACHE();
  62         acpi_enter_sleep_state_prep(acpi_state);
  63         return 0;
  64 }
  65
  66
  67 /**
  68  *      acpi_pm_enter - Actually enter a sleep state.
  69  *      @state:         State we're entering.
  70  *
  71  *      Flush caches and go to sleep. For STR or STD, we have to call
  72  *      arch-specific assembly, which in turn call acpi_enter_sleep_state().
  73  *      It's unfortunate, but it works. Please fix if you're feeling frisky.
  74  */
  75
  76 static int acpi_pm_enter(u32 state)
  77 {
  78         acpi_status status = AE_OK;
  79         unsigned long flags = 0;
  80         u32 acpi_state = acpi_suspend_states[state];
  81
  82         ACPI_FLUSH_CPU_CACHE();
  83
  84         /* Do arch specific saving of state. */
  85         if (state > PM_SUSPEND_STANDBY) {
  86                 int error = acpi_save_state_mem();
  87                 if (error)
  88                         return error;
  89         }
  90
  91
  92         local_irq_save(flags);
  93         switch (state)
  94         {
  95         case PM_SUSPEND_STANDBY:
  96                 barrier();
  97                 status = acpi_enter_sleep_state(acpi_state);
  98                 break;
  99
 100         case PM_SUSPEND_MEM:
 101                 do_suspend_lowlevel();
 102                 break;
 103
 104         case PM_SUSPEND_DISK:
 105                 if (acpi_pm_ops.pm_disk_mode == PM_DISK_PLATFORM)
 106                         status = acpi_enter_sleep_state(acpi_state);
 107                 else
 108                         do_suspend_lowlevel_s4bios();
 109                 break;
 110         default:
 111                 return -EINVAL;
 112         }
 113         local_irq_restore(flags);
 114         printk(KERN_DEBUG "Back to C!\n");
 115
 116         /* restore processor state
 117          * We should only be here if we're coming back from STR or STD.
 118          * And, in the case of the latter, the memory image should have already
 119          * been loaded from disk.
 120          */
 121         if (state > PM_SUSPEND_STANDBY)
 122                 acpi_restore_state_mem();
 123
 124
 125         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 126 }
 127
 128
 129 /**
 130  *      acpi_pm_finish - Finish up suspend sequence.
 131  *      @state:         State we're coming out of.
 132  *
 133  *      This is called after we wake back up (or if entering the sleep state
 134  *      failed).
 135  */
 136
 137 static int acpi_pm_finish(u32 state)
 138 {
 139         acpi_leave_sleep_state(state);
 140
 141         /* reset firmware waking vector */
 142         acpi_set_firmware_waking_vector((acpi_physical_address) 0);
 143
 144         if (init_8259A_after_S1) {
 145                 printk("Broken toshiba laptop -> kicking interrupts\n");
 146                 init_8259A(0);
 147         }
 148         return 0;
 149 }
 150
 151
 152 int acpi_suspend(u32 acpi_state)
 153 {
 154         u32 states[] = {
 155                 [1]     = PM_SUSPEND_STANDBY,
 156                 [3]     = PM_SUSPEND_MEM,
 157                 [4]     = PM_SUSPEND_DISK,
 158         };
 159
 160         if (acpi_state <= 4 && states[acpi_state])
 161                 return pm_suspend(states[acpi_state]);
 162         return -EINVAL;
 163 }
 164
 165 static struct pm_ops acpi_pm_ops = {
 166         .prepare        = acpi_pm_prepare,
 167         .enter          = acpi_pm_enter,
 168         .finish         = acpi_pm_finish,
 169 };
 170
 171
 172 /*
 173  * Toshiba fails to preserve interrupts over S1, reinitialization
 174  * of 8259 is needed after S1 resume.
 175  */
 176 static int __init init_ints_after_s1(struct dmi_system_id *d)
 177 {
 178         printk(KERN_WARNING "%s with broken S1 detected.\n", d->ident);
 179         init_8259A_after_S1 = 1;
 180         return 0;
 181 }
 182
 183 static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
 184         {
 185                 .callback = init_ints_after_s1,
 186                 .ident = "Toshiba Satellite 4030cdt",
 187                 .matches = { DMI_MATCH(DMI_PRODUCT_NAME, "S4030CDT/4.3"), },
 188         },
 189         { },
 190 };
 191
 192 static int __init acpi_sleep_init(void)
 193 {
 194         int                     i = 0;
 195
 196         dmi_check_system(acpisleep_dmi_table);
 197
 198         if (acpi_disabled)
 199                 return 0;
 200
 201         printk(KERN_INFO PREFIX "(supports");
 202         for (i=0; i<ACPI_S_STATE_COUNT; i++) {
 203                 acpi_status status;
 204                 u8 type_a, type_b;
 205                 status = acpi_get_sleep_type_data(i, &type_a, &type_b);
 206                 if (ACPI_SUCCESS(status)) {
 207                         sleep_states[i] = 1;
 208                         printk(" S%d", i);
 209                 }
 210                 if (i == ACPI_STATE_S4) {
 211                         if (acpi_gbl_FACS->S4bios_f) {
 212                                 sleep_states[i] = 1;
 213                                 printk(" S4bios");
 214                                 acpi_pm_ops.pm_disk_mode = PM_DISK_FIRMWARE;
 215                         } else if (sleep_states[i])
 216                                 acpi_pm_ops.pm_disk_mode = PM_DISK_PLATFORM;
 217                 }
 218         }
 219         printk(")\n");
 220
 221         pm_set_ops(&acpi_pm_ops);
 222         return 0;
 223 }
 224
 225 late_initcall(acpi_sleep_init);