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/*
* File: arch/blackfin/mach-common/pm.c
* Based on: arm/mach-omap/pm.c
* Author: Cliff Brake <cbrake@accelent.com> Copyright (c) 2001
*
* Created: 2001
* Description: Power management for the bfin
*
* Modified: Nicolas Pitre - PXA250 support
* Copyright (c) 2002 Monta Vista Software, Inc.
* David Singleton - OMAP1510
* Copyright (c) 2002 Monta Vista Software, Inc.
* Dirk Behme <dirk.behme@de.bosch.com> - OMAP1510/1610
* Copyright 2004
* Copyright 2004-2006 Analog Devices Inc.
*
* Bugs: Enter bugs at http://blackfin.uclinux.org/
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see the file COPYING, or write
* to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <linux/suspend.h>
#include <linux/sched.h>
#include <linux/proc_fs.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <asm/dpmc.h>
#include <asm/gpio.h>
#ifdef CONFIG_PM_WAKEUP_GPIO_POLAR_H
#define WAKEUP_TYPE PM_WAKE_HIGH
#endif
#ifdef CONFIG_PM_WAKEUP_GPIO_POLAR_L
#define WAKEUP_TYPE PM_WAKE_LOW
#endif
#ifdef CONFIG_PM_WAKEUP_GPIO_POLAR_EDGE_F
#define WAKEUP_TYPE PM_WAKE_FALLING
#endif
#ifdef CONFIG_PM_WAKEUP_GPIO_POLAR_EDGE_R
#define WAKEUP_TYPE PM_WAKE_RISING
#endif
#ifdef CONFIG_PM_WAKEUP_GPIO_POLAR_EDGE_B
#define WAKEUP_TYPE PM_WAKE_BOTH_EDGES
#endif
void bfin_pm_suspend_standby_enter(void)
{
#ifdef CONFIG_PM_WAKEUP_BY_GPIO
gpio_pm_wakeup_request(CONFIG_PM_WAKEUP_GPIO_NUMBER, WAKEUP_TYPE);
#endif
#if defined(CONFIG_PM_WAKEUP_BY_GPIO) || defined(CONFIG_PM_WAKEUP_GPIO_API)
{
u32 flags;
local_irq_save(flags);
sleep_deeper(gpio_pm_setup()); /*Goto Sleep*/
gpio_pm_restore();
bfin_write_SIC_IWR(IWR_ENABLE_ALL);
local_irq_restore(flags);
}
#endif
#if defined(CONFIG_PM_WAKEUP_GPIO_BY_SIC_IWR)
sleep_deeper(CONFIG_PM_WAKEUP_SIC_IWR);
bfin_write_SIC_IWR(IWR_ENABLE_ALL);
#endif /* CONFIG_PM_WAKEUP_GPIO_BY_SIC_IWR */
}
/*
* bfin_pm_prepare - Do preliminary suspend work.
* @state: suspend state we're entering.
*
*/
static int bfin_pm_prepare(suspend_state_t state)
{
int error = 0;
switch (state) {
case PM_SUSPEND_STANDBY:
break;
case PM_SUSPEND_MEM:
return -ENOTSUPP;
default:
return -EINVAL;
}
return error;
}
/*
* bfin_pm_enter - Actually enter a sleep state.
* @state: State we're entering.
*
*/
static int bfin_pm_enter(suspend_state_t state)
{
switch (state) {
case PM_SUSPEND_STANDBY:
bfin_pm_suspend_standby_enter();
break;
case PM_SUSPEND_MEM:
return -ENOTSUPP;
default:
return -EINVAL;
}
return 0;
}
/*
* bfin_pm_finish - Finish up suspend sequence.
* @state: State we're coming out of.
*
* This is called after we wake back up (or if entering the sleep state
* failed).
*/
static int bfin_pm_finish(suspend_state_t state)
{
switch (state) {
case PM_SUSPEND_STANDBY:
break;
case PM_SUSPEND_MEM:
return -ENOTSUPP;
default:
return -EINVAL;
}
return 0;
}
static int bfin_pm_valid(suspend_state_t state)
{
return (state == PM_SUSPEND_STANDBY);
}
struct platform_suspend_ops bfin_pm_ops = {
.prepare = bfin_pm_prepare,
.enter = bfin_pm_enter,
.finish = bfin_pm_finish,
.valid = bfin_pm_valid,
};
static int __init bfin_pm_init(void)
{
suspend_set_ops(&bfin_pm_ops);
return 0;
}
__initcall(bfin_pm_init);
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