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pm.c

/*
 * 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_valid - Tell the PM core that we only support the standby sleep
 *                state
 *    @state:           suspend state we're checking.
 *
 */
static int bfin_pm_valid(suspend_state_t state)
{
      return (state == PM_SUSPEND_STANDBY);
}

/*
 *    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;
}

struct platform_suspend_ops bfin_pm_ops = {
      .enter = bfin_pm_enter,
      .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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