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