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_s4bios(void);
  27 extern void do_suspend_lowlevel(void);
  28
  29 static u32 acpi_suspend_states[] = {
  30         [PM_SUSPEND_ON] = ACPI_STATE_S0,
  31         [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
  32         [PM_SUSPEND_MEM] = ACPI_STATE_S3,
  33         [PM_SUSPEND_DISK] = ACPI_STATE_S4,
  34         [PM_SUSPEND_MAX] = ACPI_STATE_S5
  35 };
  36
  37 static int init_8259A_after_S1;
  38
  39 /**
  40  *      acpi_pm_prepare - Do preliminary suspend work.
  41  *      @pm_state:              suspend state we're entering.
  42  *
  43  *      Make sure we support the state. If we do, and we need it, set the
  44  *      firmware waking vector and do arch-specific nastiness to get the
  45  *      wakeup code to the waking vector.
  46  */
  47
  48 extern int acpi_sleep_prepare(u32 acpi_state);
  49 extern void acpi_power_off(void);
  50
  51 static int acpi_pm_prepare(suspend_state_t pm_state)
  52 {
  53         u32 acpi_state = acpi_suspend_states[pm_state];
  54
  55         if (!sleep_states[acpi_state]) {
  56                 printk("acpi_pm_prepare does not support %d \n", pm_state);
  57                 return -EPERM;
  58         }
  59         return acpi_sleep_prepare(acpi_state);
  60 }
  61
  62 /**
  63  *      acpi_pm_enter - Actually enter a sleep state.
  64  *      @pm_state:              State we're entering.
  65  *
  66  *      Flush caches and go to sleep. For STR or STD, we have to call
  67  *      arch-specific assembly, which in turn call acpi_enter_sleep_state().
  68  *      It's unfortunate, but it works. Please fix if you're feeling frisky.
  69  */
  70
  71 static int acpi_pm_enter(suspend_state_t pm_state)
  72 {
  73         acpi_status status = AE_OK;
  74         unsigned long flags = 0;
  75         u32 acpi_state = acpi_suspend_states[pm_state];
  76
  77         ACPI_FLUSH_CPU_CACHE();
  78
  79         /* Do arch specific saving of state. */
  80         if (pm_state > PM_SUSPEND_STANDBY) {
  81                 int error = acpi_save_state_mem();
  82                 if (error)
  83                         return error;
  84         }
  85
  86         local_irq_save(flags);
  87         acpi_enable_wakeup_device(acpi_state);
  88         switch (pm_state) {
  89         case PM_SUSPEND_STANDBY:
  90                 barrier();
  91                 status = acpi_enter_sleep_state(acpi_state);
  92                 break;
  93
  94         case PM_SUSPEND_MEM:
  95                 do_suspend_lowlevel();
  96                 break;
  97
  98         case PM_SUSPEND_DISK:
  99                 if (acpi_pm_ops.pm_disk_mode == PM_DISK_PLATFORM)
 100                         status = acpi_enter_sleep_state(acpi_state);
 101                 else
 102                         do_suspend_lowlevel_s4bios();
 103                 break;
 104         case PM_SUSPEND_MAX:
 105                 acpi_power_off();
 106                 break;
 107
 108         default:
 109                 return -EINVAL;
 110         }
 111         local_irq_restore(flags);
 112         printk(KERN_DEBUG "Back to C!\n");
 113
 114         /* restore processor state
 115          * We should only be here if we're coming back from STR or STD.
 116          * And, in the case of the latter, the memory image should have already
 117          * been loaded from disk.
 118          */
 119         if (pm_state > PM_SUSPEND_STANDBY)
 120                 acpi_restore_state_mem();
 121
 122         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 123 }
 124
 125 /**
 126  *      acpi_pm_finish - Finish up suspend sequence.
 127  *      @pm_state:              State we're coming out of.
 128  *
 129  *      This is called after we wake back up (or if entering the sleep state
 130  *      failed).
 131  */
 132
 133 static int acpi_pm_finish(suspend_state_t pm_state)
 134 {
 135         u32 acpi_state = acpi_suspend_states[pm_state];
 136
 137         acpi_leave_sleep_state(acpi_state);
 138         acpi_disable_wakeup_device(acpi_state);
 139
 140         /* reset firmware waking vector */
 141         acpi_set_firmware_waking_vector((acpi_physical_address) 0);
 142
 143         if (init_8259A_after_S1) {
 144                 printk("Broken toshiba laptop -> kicking interrupts\n");
 145                 init_8259A(0);
 146         }
 147         return 0;
 148 }
 149
 150 int acpi_suspend(u32 acpi_state)
 151 {
 152         suspend_state_t states[] = {
 153                 [1] = PM_SUSPEND_STANDBY,
 154                 [3] = PM_SUSPEND_MEM,
 155                 [4] = PM_SUSPEND_DISK,
 156                 [5] = PM_SUSPEND_MAX
 157         };
 158
 159         if (acpi_state < 6 && states[acpi_state])
 160                 return pm_suspend(states[acpi_state]);
 161         return -EINVAL;
 162 }
 163
 164 static struct pm_ops acpi_pm_ops = {
 165         .prepare = acpi_pm_prepare,
 166         .enter = acpi_pm_enter,
 167         .finish = acpi_pm_finish,
 168 };
 169
 170 /*
 171  * Toshiba fails to preserve interrupts over S1, reinitialization
 172  * of 8259 is needed after S1 resume.
 173  */
 174 static int __init init_ints_after_s1(struct dmi_system_id *d)
 175 {
 176         printk(KERN_WARNING "%s with broken S1 detected.\n", d->ident);
 177         init_8259A_after_S1 = 1;
 178         return 0;
 179 }
 180
 181 static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
 182         {
 183          .callback = init_ints_after_s1,
 184          .ident = "Toshiba Satellite 4030cdt",
 185          .matches = {DMI_MATCH(DMI_PRODUCT_NAME, "S4030CDT/4.3"),},
 186          },
 187         {},
 188 };
 189
 190 static int __init acpi_sleep_init(void)
 191 {
 192         int i = 0;
 193
 194         dmi_check_system(acpisleep_dmi_table);
 195
 196         if (acpi_disabled)
 197                 return 0;
 198
 199         printk(KERN_INFO PREFIX "(supports");
 200         for (i = 0; i < ACPI_S_STATE_COUNT; i++) {
 201                 acpi_status status;
 202                 u8 type_a, type_b;
 203                 status = acpi_get_sleep_type_data(i, &type_a, &type_b);
 204                 if (ACPI_SUCCESS(status)) {
 205                         sleep_states[i] = 1;
 206                         printk(" S%d", i);
 207                 }
 208                 if (i == ACPI_STATE_S4) {
 209                         if (acpi_gbl_FACS->S4bios_f) {
 210                                 sleep_states[i] = 1;
 211                                 printk(" S4bios");
 212                                 acpi_pm_ops.pm_disk_mode = PM_DISK_FIRMWARE;
 213                         }
 214                         if (sleep_states[i])
 215                                 acpi_pm_ops.pm_disk_mode = PM_DISK_PLATFORM;
 216                 }
 217         }
 218         printk(")\n");
 219
 220         pm_set_ops(&acpi_pm_ops);
 221         return 0;
 222 }
 223
 224 late_initcall(acpi_sleep_init);