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/*
* sleep.c - ACPI sleep support.
*
* Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com>
* Copyright (c) 2000-2003 Patrick Mochel
* Copyright (c) 2003 Open Source Development Lab
*
* This file is released under the GPLv2.
*
*/
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/dmi.h>
#include <linux/device.h>
#include <linux/suspend.h>
#include <asm/io.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#include "sleep.h"
u8 sleep_states[ACPI_S_STATE_COUNT];
static struct pm_ops acpi_pm_ops;
extern void do_suspend_lowlevel_s4bios(void);
extern void do_suspend_lowlevel(void);
static u32 acpi_suspend_states[] = {
[PM_SUSPEND_ON] = ACPI_STATE_S0,
[PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
[PM_SUSPEND_MEM] = ACPI_STATE_S3,
[PM_SUSPEND_DISK] = ACPI_STATE_S4,
};
static int init_8259A_after_S1;
/**
* acpi_pm_prepare - Do preliminary suspend work.
* @pm_state: suspend state we're entering.
*
* Make sure we support the state. If we do, and we need it, set the
* firmware waking vector and do arch-specific nastiness to get the
* wakeup code to the waking vector.
*/
static int acpi_pm_prepare(suspend_state_t pm_state)
{
u32 acpi_state = acpi_suspend_states[pm_state];
if (!sleep_states[acpi_state])
return -EPERM;
/* do we have a wakeup address for S2 and S3? */
/* Here, we support only S4BIOS, those we set the wakeup address */
/* S4OS is only supported for now via swsusp.. */
if (pm_state == PM_SUSPEND_MEM || pm_state == PM_SUSPEND_DISK) {
if (!acpi_wakeup_address)
return -EFAULT;
acpi_set_firmware_waking_vector(
(acpi_physical_address) virt_to_phys(
(void *)acpi_wakeup_address));
}
ACPI_FLUSH_CPU_CACHE();
acpi_enable_wakeup_device_prep(acpi_state);
acpi_enter_sleep_state_prep(acpi_state);
return 0;
}
/**
* acpi_pm_enter - Actually enter a sleep state.
* @pm_state: State we're entering.
*
* Flush caches and go to sleep. For STR or STD, we have to call
* arch-specific assembly, which in turn call acpi_enter_sleep_state().
* It's unfortunate, but it works. Please fix if you're feeling frisky.
*/
static int acpi_pm_enter(suspend_state_t pm_state)
{
acpi_status status = AE_OK;
unsigned long flags = 0;
u32 acpi_state = acpi_suspend_states[pm_state];
ACPI_FLUSH_CPU_CACHE();
/* Do arch specific saving of state. */
if (pm_state > PM_SUSPEND_STANDBY) {
int error = acpi_save_state_mem();
if (error)
return error;
}
local_irq_save(flags);
acpi_enable_wakeup_device(acpi_state);
switch (pm_state)
{
case PM_SUSPEND_STANDBY:
barrier();
status = acpi_enter_sleep_state(acpi_state);
break;
case PM_SUSPEND_MEM:
do_suspend_lowlevel();
break;
case PM_SUSPEND_DISK:
if (acpi_pm_ops.pm_disk_mode == PM_DISK_PLATFORM)
status = acpi_enter_sleep_state(acpi_state);
else
do_suspend_lowlevel_s4bios();
break;
default:
return -EINVAL;
}
local_irq_restore(flags);
printk(KERN_DEBUG "Back to C!\n");
/* restore processor state
* We should only be here if we're coming back from STR or STD.
* And, in the case of the latter, the memory image should have already
* been loaded from disk.
*/
if (pm_state > PM_SUSPEND_STANDBY)
acpi_restore_state_mem();
return ACPI_SUCCESS(status) ? 0 : -EFAULT;
}
/**
* acpi_pm_finish - Finish up suspend sequence.
* @pm_state: State we're coming out of.
*
* This is called after we wake back up (or if entering the sleep state
* failed).
*/
static int acpi_pm_finish(suspend_state_t pm_state)
{
u32 acpi_state = acpi_suspend_states[pm_state];
acpi_leave_sleep_state(acpi_state);
acpi_disable_wakeup_device(acpi_state);
/* reset firmware waking vector */
acpi_set_firmware_waking_vector((acpi_physical_address) 0);
if (init_8259A_after_S1) {
printk("Broken toshiba laptop -> kicking interrupts\n");
init_8259A(0);
}
return 0;
}
int acpi_suspend(u32 acpi_state)
{
suspend_state_t states[] = {
[1] = PM_SUSPEND_STANDBY,
[3] = PM_SUSPEND_MEM,
[4] = PM_SUSPEND_DISK,
};
if (acpi_state <= 4 && states[acpi_state])
return pm_suspend(states[acpi_state]);
return -EINVAL;
}
static struct pm_ops acpi_pm_ops = {
.prepare = acpi_pm_prepare,
.enter = acpi_pm_enter,
.finish = acpi_pm_finish,
};
/*
* Toshiba fails to preserve interrupts over S1, reinitialization
* of 8259 is needed after S1 resume.
*/
static int __init init_ints_after_s1(struct dmi_system_id *d)
{
printk(KERN_WARNING "%s with broken S1 detected.\n", d->ident);
init_8259A_after_S1 = 1;
return 0;
}
static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
{
.callback = init_ints_after_s1,
.ident = "Toshiba Satellite 4030cdt",
.matches = { DMI_MATCH(DMI_PRODUCT_NAME, "S4030CDT/4.3"), },
},
{ },
};
static int __init acpi_sleep_init(void)
{
int i = 0;
dmi_check_system(acpisleep_dmi_table);
if (acpi_disabled)
return 0;
printk(KERN_INFO PREFIX "(supports");
for (i=0; i < ACPI_S_STATE_COUNT; i++) {
acpi_status status;
u8 type_a, type_b;
status = acpi_get_sleep_type_data(i, &type_a, &type_b);
if (ACPI_SUCCESS(status)) {
sleep_states[i] = 1;
printk(" S%d", i);
}
if (i == ACPI_STATE_S4) {
if (acpi_gbl_FACS->S4bios_f) {
sleep_states[i] = 1;
printk(" S4bios");
acpi_pm_ops.pm_disk_mode = PM_DISK_FIRMWARE;
}
if (sleep_states[i])
acpi_pm_ops.pm_disk_mode = PM_DISK_PLATFORM;
}
}
printk(")\n");
pm_set_ops(&acpi_pm_ops);
return 0;
}
late_initcall(acpi_sleep_init);
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