392 lines
9.7 KiB
C
392 lines
9.7 KiB
C
/*
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* sleep.c - ACPI sleep support.
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*
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* Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
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* Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com>
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* Copyright (c) 2000-2003 Patrick Mochel
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* Copyright (c) 2003 Open Source Development Lab
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*
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* This file is released under the GPLv2.
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*
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*/
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#include <linux/delay.h>
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#include <linux/irq.h>
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#include <linux/dmi.h>
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#include <linux/device.h>
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#include <linux/suspend.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/acpi_drivers.h>
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#include "sleep.h"
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u8 sleep_states[ACPI_S_STATE_COUNT];
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static u32 acpi_target_sleep_state = ACPI_STATE_S0;
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#ifdef CONFIG_SUSPEND
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static struct pm_ops acpi_pm_ops;
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extern void do_suspend_lowlevel(void);
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static u32 acpi_suspend_states[] = {
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[PM_SUSPEND_ON] = ACPI_STATE_S0,
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[PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
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[PM_SUSPEND_MEM] = ACPI_STATE_S3,
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[PM_SUSPEND_MAX] = ACPI_STATE_S5
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};
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static int init_8259A_after_S1;
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/**
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* acpi_pm_set_target - Set the target system sleep state to the state
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* associated with given @pm_state, if supported.
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*/
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static int acpi_pm_set_target(suspend_state_t pm_state)
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{
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u32 acpi_state = acpi_suspend_states[pm_state];
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int error = 0;
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if (sleep_states[acpi_state]) {
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acpi_target_sleep_state = acpi_state;
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} else {
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printk(KERN_ERR "ACPI does not support this state: %d\n",
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pm_state);
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error = -ENOSYS;
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}
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return error;
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}
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/**
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* acpi_pm_prepare - Do preliminary suspend work.
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* @pm_state: ignored
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*
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* If necessary, set the firmware waking vector and do arch-specific
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* nastiness to get the wakeup code to the waking vector.
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*/
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static int acpi_pm_prepare(suspend_state_t pm_state)
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{
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int error = acpi_sleep_prepare(acpi_target_sleep_state);
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if (error)
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acpi_target_sleep_state = ACPI_STATE_S0;
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return error;
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}
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/**
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* acpi_pm_enter - Actually enter a sleep state.
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* @pm_state: ignored
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*
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* Flush caches and go to sleep. For STR we have to call arch-specific
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* assembly, which in turn call acpi_enter_sleep_state().
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* It's unfortunate, but it works. Please fix if you're feeling frisky.
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*/
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static int acpi_pm_enter(suspend_state_t pm_state)
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{
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acpi_status status = AE_OK;
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unsigned long flags = 0;
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u32 acpi_state = acpi_target_sleep_state;
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ACPI_FLUSH_CPU_CACHE();
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/* Do arch specific saving of state. */
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if (acpi_state == ACPI_STATE_S3) {
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int error = acpi_save_state_mem();
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if (error) {
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acpi_target_sleep_state = ACPI_STATE_S0;
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return error;
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}
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}
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local_irq_save(flags);
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acpi_enable_wakeup_device(acpi_state);
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switch (acpi_state) {
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case ACPI_STATE_S1:
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barrier();
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status = acpi_enter_sleep_state(acpi_state);
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break;
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case ACPI_STATE_S3:
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do_suspend_lowlevel();
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break;
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}
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/* ACPI 3.0 specs (P62) says that it's the responsabilty
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* of the OSPM to clear the status bit [ implying that the
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* POWER_BUTTON event should not reach userspace ]
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*/
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if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3))
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acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
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local_irq_restore(flags);
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printk(KERN_DEBUG "Back to C!\n");
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/* restore processor state */
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if (acpi_state == ACPI_STATE_S3)
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acpi_restore_state_mem();
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return ACPI_SUCCESS(status) ? 0 : -EFAULT;
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}
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/**
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* acpi_pm_finish - Finish up suspend sequence.
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* @pm_state: ignored
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*
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* This is called after we wake back up (or if entering the sleep state
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* failed).
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*/
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static int acpi_pm_finish(suspend_state_t pm_state)
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{
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u32 acpi_state = acpi_target_sleep_state;
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acpi_leave_sleep_state(acpi_state);
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acpi_disable_wakeup_device(acpi_state);
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/* reset firmware waking vector */
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acpi_set_firmware_waking_vector((acpi_physical_address) 0);
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acpi_target_sleep_state = ACPI_STATE_S0;
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#ifdef CONFIG_X86
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if (init_8259A_after_S1) {
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printk("Broken toshiba laptop -> kicking interrupts\n");
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init_8259A(0);
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}
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#endif
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return 0;
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}
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static int acpi_pm_state_valid(suspend_state_t pm_state)
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{
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u32 acpi_state;
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switch (pm_state) {
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case PM_SUSPEND_ON:
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case PM_SUSPEND_STANDBY:
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case PM_SUSPEND_MEM:
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acpi_state = acpi_suspend_states[pm_state];
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return sleep_states[acpi_state];
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default:
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return 0;
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}
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}
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static struct pm_ops acpi_pm_ops = {
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.valid = acpi_pm_state_valid,
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.set_target = acpi_pm_set_target,
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.prepare = acpi_pm_prepare,
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.enter = acpi_pm_enter,
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.finish = acpi_pm_finish,
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};
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/*
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* Toshiba fails to preserve interrupts over S1, reinitialization
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* of 8259 is needed after S1 resume.
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*/
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static int __init init_ints_after_s1(struct dmi_system_id *d)
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{
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printk(KERN_WARNING "%s with broken S1 detected.\n", d->ident);
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init_8259A_after_S1 = 1;
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return 0;
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}
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static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
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{
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.callback = init_ints_after_s1,
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.ident = "Toshiba Satellite 4030cdt",
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.matches = {DMI_MATCH(DMI_PRODUCT_NAME, "S4030CDT/4.3"),},
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},
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{},
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};
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#endif /* CONFIG_SUSPEND */
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#ifdef CONFIG_HIBERNATION
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static int acpi_hibernation_prepare(void)
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{
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return acpi_sleep_prepare(ACPI_STATE_S4);
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}
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static int acpi_hibernation_enter(void)
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{
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acpi_status status = AE_OK;
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unsigned long flags = 0;
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ACPI_FLUSH_CPU_CACHE();
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local_irq_save(flags);
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acpi_enable_wakeup_device(ACPI_STATE_S4);
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/* This shouldn't return. If it returns, we have a problem */
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status = acpi_enter_sleep_state(ACPI_STATE_S4);
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local_irq_restore(flags);
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return ACPI_SUCCESS(status) ? 0 : -EFAULT;
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}
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static void acpi_hibernation_finish(void)
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{
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acpi_leave_sleep_state(ACPI_STATE_S4);
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acpi_disable_wakeup_device(ACPI_STATE_S4);
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/* reset firmware waking vector */
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acpi_set_firmware_waking_vector((acpi_physical_address) 0);
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}
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static int acpi_hibernation_pre_restore(void)
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{
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acpi_status status;
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status = acpi_hw_disable_all_gpes();
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return ACPI_SUCCESS(status) ? 0 : -EFAULT;
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}
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static void acpi_hibernation_restore_cleanup(void)
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{
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acpi_hw_enable_all_runtime_gpes();
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}
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static struct hibernation_ops acpi_hibernation_ops = {
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.prepare = acpi_hibernation_prepare,
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.enter = acpi_hibernation_enter,
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.finish = acpi_hibernation_finish,
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.pre_restore = acpi_hibernation_pre_restore,
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.restore_cleanup = acpi_hibernation_restore_cleanup,
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};
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#endif /* CONFIG_HIBERNATION */
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int acpi_suspend(u32 acpi_state)
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{
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suspend_state_t states[] = {
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[1] = PM_SUSPEND_STANDBY,
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[3] = PM_SUSPEND_MEM,
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[5] = PM_SUSPEND_MAX
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};
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if (acpi_state < 6 && states[acpi_state])
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return pm_suspend(states[acpi_state]);
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if (acpi_state == 4)
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return hibernate();
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return -EINVAL;
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}
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/**
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* acpi_pm_device_sleep_state - return preferred power state of ACPI device
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* in the system sleep state given by %acpi_target_sleep_state
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* @dev: device to examine
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* @wake: if set, the device should be able to wake up the system
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* @d_min_p: used to store the upper limit of allowed states range
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* Return value: preferred power state of the device on success, -ENODEV on
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* failure (ie. if there's no 'struct acpi_device' for @dev)
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*
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* Find the lowest power (highest number) ACPI device power state that
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* device @dev can be in while the system is in the sleep state represented
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* by %acpi_target_sleep_state. If @wake is nonzero, the device should be
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* able to wake up the system from this sleep state. If @d_min_p is set,
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* the highest power (lowest number) device power state of @dev allowed
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* in this system sleep state is stored at the location pointed to by it.
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*
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* The caller must ensure that @dev is valid before using this function.
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* The caller is also responsible for figuring out if the device is
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* supposed to be able to wake up the system and passing this information
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* via @wake.
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*/
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int acpi_pm_device_sleep_state(struct device *dev, int wake, int *d_min_p)
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{
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acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
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struct acpi_device *adev;
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char acpi_method[] = "_SxD";
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unsigned long d_min, d_max;
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if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
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printk(KERN_ERR "ACPI handle has no context!\n");
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return -ENODEV;
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}
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acpi_method[2] = '0' + acpi_target_sleep_state;
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/*
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* If the sleep state is S0, we will return D3, but if the device has
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* _S0W, we will use the value from _S0W
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*/
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d_min = ACPI_STATE_D0;
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d_max = ACPI_STATE_D3;
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/*
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* If present, _SxD methods return the minimum D-state (highest power
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* state) we can use for the corresponding S-states. Otherwise, the
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* minimum D-state is D0 (ACPI 3.x).
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*
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* NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
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* provided -- that's our fault recovery, we ignore retval.
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*/
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if (acpi_target_sleep_state > ACPI_STATE_S0)
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acpi_evaluate_integer(handle, acpi_method, NULL, &d_min);
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/*
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* If _PRW says we can wake up the system from the target sleep state,
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* the D-state returned by _SxD is sufficient for that (we assume a
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* wakeup-aware driver if wake is set). Still, if _SxW exists
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* (ACPI 3.x), it should return the maximum (lowest power) D-state that
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* can wake the system. _S0W may be valid, too.
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*/
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if (acpi_target_sleep_state == ACPI_STATE_S0 ||
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(wake && adev->wakeup.state.enabled &&
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adev->wakeup.sleep_state <= acpi_target_sleep_state)) {
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acpi_method[3] = 'W';
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acpi_evaluate_integer(handle, acpi_method, NULL, &d_max);
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/* Sanity check */
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if (d_max < d_min)
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d_min = d_max;
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}
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if (d_min_p)
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*d_min_p = d_min;
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return d_max;
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}
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int __init acpi_sleep_init(void)
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{
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acpi_status status;
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u8 type_a, type_b;
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#ifdef CONFIG_SUSPEND
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int i = 0;
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dmi_check_system(acpisleep_dmi_table);
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#endif
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if (acpi_disabled)
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return 0;
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#ifdef CONFIG_SUSPEND
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printk(KERN_INFO PREFIX "(supports");
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for (i = ACPI_STATE_S0; i < ACPI_STATE_S4; i++) {
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status = acpi_get_sleep_type_data(i, &type_a, &type_b);
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if (ACPI_SUCCESS(status)) {
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sleep_states[i] = 1;
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printk(" S%d", i);
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}
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}
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printk(")\n");
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pm_set_ops(&acpi_pm_ops);
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#endif
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#ifdef CONFIG_HIBERNATION
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status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b);
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if (ACPI_SUCCESS(status)) {
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hibernation_set_ops(&acpi_hibernation_ops);
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sleep_states[ACPI_STATE_S4] = 1;
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}
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#else
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sleep_states[ACPI_STATE_S4] = 0;
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#endif
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return 0;
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}
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