drivers/acpi/sleep/main.c

   1 /*
   2  * sleep.c - ACPI sleep support.
   3  *
   4  * Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com>
   5  * Copyright (c) 2000-2003 Patrick Mochel
   6  * Copyright (c) 2003 Open Source Development Lab
   7  *
   8  * This file is released under the GPLv2.
   9  *
  10  */
  11
  12 #include <linux/delay.h>
  13 #include <linux/irq.h>
  14 #include <linux/dmi.h>
  15 #include <linux/device.h>
  16 #include <linux/suspend.h>
  17 #include <asm/io.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 };
  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 static int acpi_pm_prepare(suspend_state_t pm_state)
  48 {
  49         u32 acpi_state = acpi_suspend_states[pm_state];
  50
  51         if (!sleep_states[acpi_state])
  52                 return -EPERM;
  53
  54         /* do we have a wakeup address for S2 and S3? */
  55         /* Here, we support only S4BIOS, those we set the wakeup address */
  56         /* S4OS is only supported for now via swsusp.. */
  57         if (pm_state == PM_SUSPEND_MEM || pm_state == PM_SUSPEND_DISK) {
  58                 if (!acpi_wakeup_address)
  59                         return -EFAULT;
  60                 acpi_set_firmware_waking_vector(
  61                         (acpi_physical_address) virt_to_phys(
  62                                 (void *)acpi_wakeup_address));
  63         }
  64         ACPI_FLUSH_CPU_CACHE();
  65         acpi_enable_wakeup_device_prep(acpi_state);
  66         acpi_enter_sleep_state_prep(acpi_state);
  67         return 0;
  68 }
  69
  70
  71 /**
  72  *      acpi_pm_enter - Actually enter a sleep state.
  73  *      @pm_state:              State we're entering.
  74  *
  75  *      Flush caches and go to sleep. For STR or STD, we have to call
  76  *      arch-specific assembly, which in turn call acpi_enter_sleep_state().
  77  *      It's unfortunate, but it works. Please fix if you're feeling frisky.
  78  */
  79
  80 static int acpi_pm_enter(suspend_state_t pm_state)
  81 {
  82         acpi_status status = AE_OK;
  83         unsigned long flags = 0;
  84         u32 acpi_state = acpi_suspend_states[pm_state];
  85
  86         ACPI_FLUSH_CPU_CACHE();
  87
  88         /* Do arch specific saving of state. */
  89         if (pm_state > PM_SUSPEND_STANDBY) {
  90                 int error = acpi_save_state_mem();
  91                 if (error)
  92                         return error;
  93         }
  94
  95
  96         local_irq_save(flags);
  97         acpi_enable_wakeup_device(acpi_state);
  98         switch (pm_state)
  99         {
 100         case PM_SUSPEND_STANDBY:
 101                 barrier();
 102                 status = acpi_enter_sleep_state(acpi_state);
 103                 break;
 104
 105         case PM_SUSPEND_MEM:
 106                 do_suspend_lowlevel();
 107                 break;
 108
 109         case PM_SUSPEND_DISK:
 110                 if (acpi_pm_ops.pm_disk_mode == PM_DISK_PLATFORM)
 111                         status = acpi_enter_sleep_state(acpi_state);
 112                 else
 113                         do_suspend_lowlevel_s4bios();
 114                 break;
 115         default:
 116                 return -EINVAL;
 117         }
 118         local_irq_restore(flags);
 119         printk(KERN_DEBUG "Back to C!\n");
 120
 121         /* restore processor state
 122          * We should only be here if we're coming back from STR or STD.
 123          * And, in the case of the latter, the memory image should have already
 124          * been loaded from disk.
 125          */
 126         if (pm_state > PM_SUSPEND_STANDBY)
 127                 acpi_restore_state_mem();
 128
 129
 130         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 131 }
 132
 133
 134 /**
 135  *      acpi_pm_finish - Finish up suspend sequence.
 136  *      @pm_state:              State we're coming out of.
 137  *
 138  *      This is called after we wake back up (or if entering the sleep state
 139  *      failed).
 140  */
 141
 142 static int acpi_pm_finish(suspend_state_t pm_state)
 143 {
 144         u32 acpi_state = acpi_suspend_states[pm_state];
 145
 146         acpi_leave_sleep_state(acpi_state);
 147         acpi_disable_wakeup_device(acpi_state);
 148
 149         /* reset firmware waking vector */
 150         acpi_set_firmware_waking_vector((acpi_physical_address) 0);
 151
 152         if (init_8259A_after_S1) {
 153                 printk("Broken toshiba laptop -> kicking interrupts\n");
 154                 init_8259A(0);
 155         }
 156         return 0;
 157 }
 158
 159
 160 int acpi_suspend(u32 acpi_state)
 161 {
 162         suspend_state_t states[] = {
 163                 [1]     = PM_SUSPEND_STANDBY,
 164                 [3]     = PM_SUSPEND_MEM,
 165                 [4]     = PM_SUSPEND_DISK,
 166         };
 167
 168         if (acpi_state <= 4 && states[acpi_state])
 169                 return pm_suspend(states[acpi_state]);
 170         return -EINVAL;
 171 }
 172
 173 static struct pm_ops acpi_pm_ops = {
 174         .prepare        = acpi_pm_prepare,
 175         .enter          = acpi_pm_enter,
 176         .finish         = acpi_pm_finish,
 177 };
 178
 179
 180 /*
 181  * Toshiba fails to preserve interrupts over S1, reinitialization
 182  * of 8259 is needed after S1 resume.
 183  */
 184 static int __init init_ints_after_s1(struct dmi_system_id *d)
 185 {
 186         printk(KERN_WARNING "%s with broken S1 detected.\n", d->ident);
 187         init_8259A_after_S1 = 1;
 188         return 0;
 189 }
 190
 191 static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
 192         {
 193                 .callback = init_ints_after_s1,
 194                 .ident = "Toshiba Satellite 4030cdt",
 195                 .matches = { DMI_MATCH(DMI_PRODUCT_NAME, "S4030CDT/4.3"), },
 196         },
 197         { },
 198 };
 199
 200 static int __init acpi_sleep_init(void)
 201 {
 202         int                     i = 0;
 203
 204         dmi_check_system(acpisleep_dmi_table);
 205
 206         if (acpi_disabled)
 207                 return 0;
 208
 209         printk(KERN_INFO PREFIX "(supports");
 210         for (i=0; i < ACPI_S_STATE_COUNT; i++) {
 211                 acpi_status status;
 212                 u8 type_a, type_b;
 213                 status = acpi_get_sleep_type_data(i, &type_a, &type_b);
 214                 if (ACPI_SUCCESS(status)) {
 215                         sleep_states[i] = 1;
 216                         printk(" S%d", i);
 217                 }
 218                 if (i == ACPI_STATE_S4) {
 219                         if (acpi_gbl_FACS->S4bios_f) {
 220                                 sleep_states[i] = 1;
 221                                 printk(" S4bios");
 222                                 acpi_pm_ops.pm_disk_mode = PM_DISK_FIRMWARE;
 223                         }
 224                         if (sleep_states[i])
 225                                 acpi_pm_ops.pm_disk_mode = PM_DISK_PLATFORM;
 226                 }
 227         }
 228         printk(")\n");
 229
 230         pm_set_ops(&acpi_pm_ops);
 231         return 0;
 232 }
 233
 234 late_initcall(acpi_sleep_init);