arch/arm/include/asm/hardware/arm_timer.h


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#ifndef __ASM_ARM_HARDWARE_ARM_TIMER_H
#define __ASM_ARM_HARDWARE_ARM_TIMER_H

/*
 * ARM timer implementation, found in Integrator, Versatile and Realview
 * platforms.  Not all platforms support all registers and bits in these
 * registers, so we mark them with A for Integrator AP, C for Integrator
 * CP, V for Versatile and R for Realview.
 *
 * Integrator AP has 16-bit timers, Integrator CP, Versatile and Realview
 * can have 16-bit or 32-bit selectable via a bit in the control register.
 */
#define TIMER_LOAD	0x00			/* ACVR rw */
#define TIMER_VALUE	0x04			/* ACVR ro */
#define TIMER_CTRL	0x08			/* ACVR rw */
#define TIMER_CTRL_ONESHOT	(1 << 0)	/*  CVR */
#define TIMER_CTRL_32BIT	(1 << 1)	/*  CVR */
#define TIMER_CTRL_DIV1		(0 << 2)	/* ACVR */
#define TIMER_CTRL_DIV16	(1 << 2)	/* ACVR */
#define TIMER_CTRL_DIV256	(2 << 2)	/* ACVR */
#define TIMER_CTRL_IE		(1 << 5)	/*   VR */
#define TIMER_CTRL_PERIODIC	(1 << 6)	/* ACVR */
#define TIMER_CTRL_ENABLE	(1 << 7)	/* ACVR */

#define TIMER_INTCLR	0x0c			/* ACVR wo */
#define TIMER_RIS	0x10			/*  CVR ro */
#define TIMER_MIS	0x14			/*  CVR ro */
#define TIMER_BGLOAD	0x18			/*  CVR rw */

#endif
/*
 * sleep.c - ACPI sleep support.
 *
 * Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
 * 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 <linux/reboot.h>
#include <linux/acpi.h>

#include <asm/io.h>

#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>

#include "internal.h"
#include "sleep.h"

static u8 sleep_states[ACPI_S_STATE_COUNT];

static void acpi_sleep_tts_switch(u32 acpi_state)
{
	union acpi_object in_arg = { ACPI_TYPE_INTEGER };
	struct acpi_object_list arg_list = { 1, &in_arg };
	acpi_status status = AE_OK;

	in_arg.integer.value = acpi_state;
	status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL);
	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
		/*
		 * OS can't evaluate the _TTS object correctly. Some warning
		 * message will be printed. But it won't break anything.
		 */
		printk(KERN_NOTICE "Failure in evaluating _TTS object\n");
	}
}

static int tts_notify_reboot(struct notifier_block *this,
			unsigned long code, void *x)
{
	acpi_sleep_tts_switch(ACPI_STATE_S5);
	return NOTIFY_DONE;
}

static struct notifier_block tts_notifier = {
	.notifier_call	= tts_notify_reboot,
	.next		= NULL,
	.priority	= 0,
};

static int acpi_sleep_prepare(u32 acpi_state)
{
#ifdef CONFIG_ACPI_SLEEP
	/* do we have a wakeup address for S2 and S3? */
	if (acpi_state == ACPI_STATE_S3) {
		if (!acpi_wakeup_address) {
			return -EFAULT;
		}
		acpi_set_firmware_waking_vector(
				(acpi_physical_address)acpi_wakeup_address);

	}
	ACPI_FLUSH_CPU_CACHE();
#endif
	printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
		acpi_state);
	acpi_enable_wakeup_devices(acpi_state);
	acpi_enter_sleep_state_prep(acpi_state);
	return 0;
}

#ifdef CONFIG_ACPI_SLEEP
static u32 acpi_target_sleep_state = ACPI_STATE_S0;

/*
 * The ACPI specification wants us to save NVS memory regions during hibernation
 * and to restore them during the subsequent resume.  Windows does that also for
 * suspend to RAM.  However, it is known that this mechanism does not work on
 * all machines, so we allow the user to disable it with the help of the
 * 'acpi_sleep=nonvs' kernel command line option.
 */
static bool nvs_nosave;

void __init acpi_nvs_nosave(void)
{
	nvs_nosave = true;
}

/*
 * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
 * user to request that behavior by using the 'acpi_old_suspend_ordering'
 * kernel command line option that causes the following variable to be set.
 */
static bool old_suspend_ordering;

void __init acpi_old_suspend_ordering(void)
{
	old_suspend_ordering = true;
}

/**
 * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
 */
static int acpi_pm_freeze(void)
{
	acpi_disable_all_gpes();
	acpi_os_wait_events_complete(NULL);
	acpi_ec_block_transactions();
	return 0;
}

/**
 * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
 */
static int acpi_pm_pre_suspend(void)
{
	acpi_pm_freeze();
	return suspend_nvs_save();
}

/**
 *	__acpi_pm_prepare - Prepare the platform to enter the target state.
 *
 *	If necessary, set the firmware waking vector and do arch-specific
 *	nastiness to get the wakeup code to the waking vector.
 */
static int __acpi_pm_prepare(void)
{
	int error = acpi_sleep_prepare(acpi_target_sleep_state);
	if (error)
		acpi_target_sleep_state = ACPI_STATE_S0;

	return error;
}

/**
 *	acpi_pm_prepare - Prepare the platform to enter the target sleep
 *		state and disable the GPEs.
 */
static int acpi_pm_prepare(void)
{
	int error = __acpi_pm_prepare();
	if (!error)
		error = acpi_pm_pre_suspend();

	return error;
}

/**
 *	acpi_pm_finish - Instruct the platform to leave a sleep state.
 *
 *	This is called after we wake back up (or if entering the sleep state
 *	failed).
 */
static void acpi_pm_finish(void)
{
	u32 acpi_state = acpi_target_sleep_state;

	acpi_ec_unblock_transactions();
	suspend_nvs_free();

	if (acpi_state == ACPI_STATE_S0)
		return;

	printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
		acpi_state);
	acpi_disable_wakeup_devices(acpi_state);
	acpi_leave_sleep_state(acpi_state);

	/* reset firmware waking vector */
	acpi_set_firmware_waking_vector((acpi_physical_address) 0);

	acpi_target_sleep_state = ACPI_STATE_S0;
}

/**
 *	acpi_pm_end - Finish up suspend sequence.
 */
static void acpi_pm_end(void)
{
	/*
	 * This is necessary in case acpi_pm_finish() is not called during a
	 * failing transition to a sleep state.
	 */
	acpi_target_sleep_state = ACPI_STATE_S0;
	acpi_sleep_tts_switch(acpi_target_sleep_state);
}
#else /* !CONFIG_ACPI_SLEEP */
#define acpi_target_sleep_state	ACPI_STATE_S0
#endif /* CONFIG_ACPI_SLEEP */

#ifdef CONFIG_SUSPEND
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_MAX] = ACPI_STATE_S5
};

/**
 *	acpi_suspend_begin - Set the target system sleep state to the state
 *		associated with given @pm_state, if supported.
 */
static int acpi_suspend_begin(suspend_state_t pm_state)
{
	u32 acpi_state = acpi_suspend_states[pm_state];
	int error = 0;

	error = nvs_nosave ? 0 : suspend_nvs_alloc();
	if (error)
		return error;

	if (sleep_states[acpi_state]) {
		acpi_target_sleep_state = acpi_state;
		acpi_sleep_tts_switch(acpi_target_sleep_state);
	} else {
		printk(KERN_ERR "ACPI does not support this state: %d\n",
			pm_state);
		error = -ENOSYS;
	}
	return error;
}

/**
 *	acpi_suspend_enter - Actually enter a sleep state.
 *	@pm_state: ignored
 *
 *	Flush caches and go to sleep. For STR 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_suspend_enter(suspend_state_t pm_state)
{
	acpi_status status = AE_OK;
	u32 acpi_state = acpi_target_sleep_state;
	int error;

	ACPI_FLUSH_CPU_CACHE();

	switch (acpi_state) {
	case ACPI_STATE_S1:
		barrier();
		status = acpi_enter_sleep_state(acpi_state);
		break;

	case ACPI_STATE_S3:
		error = acpi_suspend_lowlevel();
		if (error)
			return error;
		pr_info(PREFIX "Low-level resume complete\n");
		break;
	}

	/* This violates the spec but is required for bug compatibility. */
	acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);

	/* Reprogram control registers and execute _BFS */
	acpi_leave_sleep_state_prep(acpi_state);

	/* ACPI 3.0 specs (P62) says that it's the responsibility
	 * of the OSPM to clear the status bit [ implying that the
	 * POWER_BUTTON event should not reach userspace ]
	 */
	if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3))
		acpi_clear_event(ACPI_EVENT_POWER_BUTTON);

	/*
	 * Disable and clear GPE status before interrupt is enabled. Some GPEs
	 * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
	 * acpi_leave_sleep_state will reenable specific GPEs later
	 */
	acpi_disable_all_gpes();
	/* Allow EC transactions to happen. */
	acpi_ec_unblock_transactions_early();

	suspend_nvs_restore();

	return ACPI_SUCCESS(status) ? 0 : -EFAULT;
}

static int acpi_suspend_state_valid(suspend_state_t pm_state)
{
	u32 acpi_state;

	switch (pm_state) {
	case PM_SUSPEND_ON:
	case PM_SUSPEND_STANDBY:
	case PM_SUSPEND_MEM:
		acpi_state = acpi_suspend_states[pm_state];

		return sleep_states[acpi_state];
	default:
		return 0;
	}
}

static const struct platform_suspend_ops acpi_suspend_ops = {
	.valid = acpi_suspend_state_valid,
	.begin = acpi_suspend_begin,
	.prepare_late = acpi_pm_prepare,
	.enter = acpi_suspend_enter,
	.wake = acpi_pm_finish,
	.end = acpi_pm_end,
};

/**
 *	acpi_suspend_begin_old - Set the target system sleep state to the
 *		state associated with given @pm_state, if supported, and
 *		execute the _PTS control method.  This function is used if the
 *		pre-ACPI 2.0 suspend ordering has been requested.
 */
static int acpi_suspend_begin_old(suspend_state_t pm_state)
{
	int error = acpi_suspend_begin(pm_state);
	if (!error)
		error = __acpi_pm_prepare();

	return error;
}

/*
 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
 * been requested.
 */
static const struct platform_suspend_ops acpi_suspend_ops_old = {
	.valid = acpi_suspend_state_valid,
	.begin = acpi_suspend_begin_old,
	.prepare_late = acpi_pm_pre_suspend,
	.enter = acpi_suspend_enter,
	.wake = acpi_pm_finish,
	.end = acpi_pm_end,
	.recover = acpi_pm_finish,
};

static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
{
	old_suspend_ordering = true;
	return 0;
}

static int __init init_nvs_nosave(const struct dmi_system_id *d)
{
	acpi_nvs_nosave();
	return 0;
}

static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
	{
	.callback = init_old_suspend_ordering,
	.ident = "Abit KN9 (nForce4 variant)",
	.matches = {
		DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
		DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
		},
	},
	{
	.callback = init_old_suspend_ordering,
	.ident = "HP xw4600 Workstation",
	.matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
		DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
		},
	},
	{
	.callback = init_old_suspend_ordering,
	.ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
	.matches = {
		DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
		DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
		},
	},
	{
	.callback = init_old_suspend_ordering,
	.ident = "Panasonic CF51-2L",
	.matches = {
		DMI_MATCH(DMI_BOARD_VENDOR,
				"Matsushita Electric Industrial Co.,Ltd."),
		DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
		},
	},
	{
	.callback = init_nvs_nosave,
	.ident = "Sony Vaio VGN-FW21E",
	.matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
		DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"),
		},
	},
	{
	.callback = init_nvs_nosave,
	.ident = "Sony Vaio VPCEB17FX",
	.matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
		DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"),
		},
	},
	{
	.callback = init_nvs_nosave,
	.ident = "Sony Vaio VGN-SR11M",
	.matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
		DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
		},
	},
	{
	.callback = init_nvs_nosave,
	.ident = "Everex StepNote Series",
	.matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."),
		DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"),
		},
	},
	{
	.callback = init_nvs_nosave,