278 lines
6.4 KiB
C
278 lines
6.4 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 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_prepare - Do preliminary suspend work.
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* @pm_state: suspend state we're entering.
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*
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* Make sure we support the state. If we do, and we need it, set the
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* firmware waking vector and do arch-specific nastiness to get the
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* wakeup code to the waking vector.
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*/
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extern int acpi_sleep_prepare(u32 acpi_state);
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extern void acpi_power_off(void);
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static int acpi_pm_prepare(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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if (!sleep_states[acpi_state]) {
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printk("acpi_pm_prepare does not support %d \n", pm_state);
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return -EPERM;
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}
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return acpi_sleep_prepare(acpi_state);
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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: State we're entering.
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*
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* Flush caches and go to sleep. For STR or STD, we have to call
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* arch-specific 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_suspend_states[pm_state];
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ACPI_FLUSH_CPU_CACHE();
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/* Do arch specific saving of state. */
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if (pm_state > PM_SUSPEND_STANDBY) {
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int error = acpi_save_state_mem();
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if (error)
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return error;
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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 (pm_state) {
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case PM_SUSPEND_STANDBY:
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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 PM_SUSPEND_MEM:
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do_suspend_lowlevel();
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break;
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default:
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return -EINVAL;
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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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* We should only be here if we're coming back from STR or STD.
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* And, in the case of the latter, the memory image should have already
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* been loaded from disk.
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*/
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if (pm_state > PM_SUSPEND_STANDBY)
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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: State we're coming out of.
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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_suspend_states[pm_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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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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return 0;
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}
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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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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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.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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#ifdef CONFIG_SOFTWARE_SUSPEND
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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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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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}
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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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};
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#endif /* CONFIG_SOFTWARE_SUSPEND */
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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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int __init acpi_sleep_init(void)
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{
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int i = 0;
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dmi_check_system(acpisleep_dmi_table);
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if (acpi_disabled)
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return 0;
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printk(KERN_INFO PREFIX "(supports");
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for (i = 0; i < ACPI_S_STATE_COUNT; i++) {
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acpi_status status;
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u8 type_a, type_b;
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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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#ifdef CONFIG_SOFTWARE_SUSPEND
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if (sleep_states[ACPI_STATE_S4])
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hibernation_set_ops(&acpi_hibernation_ops);
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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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