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pm.c

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/*
 *  Copyright 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved.
 */

/*
 * The code contained herein is licensed under the GNU General Public
 * License. You may obtain a copy of the GNU General Public License
 * Version 2 or later at the following locations:
 *
 * http://www.opensource.org/licenses/gpl-license.html
 * http://www.gnu.org/copyleft/gpl.html
 */

#include <linux/kernel.h>
#include <linux/suspend.h>
#include <mach/hardware.h>

/*!
 * @defgroup MSL_MX35 i.MX35 Machine Specific Layer (MSL)
 */

int suspend_ops_started;
int is_suspend_ops_started(void)
{
      return suspend_ops_started;
}
/*!
 * @file mach-mx35/pm.c
 * @brief This file contains suspend operations
 *
 * @ingroup MSL_MX35
 */
static int mx35_suspend_enter(suspend_state_t state)
{
      switch (state) {
      case PM_SUSPEND_MEM:
            mxc_cpu_lp_set(STOP_POWER_OFF);
            break;
      case PM_SUSPEND_STANDBY:
            mxc_cpu_lp_set(STOP_POWER_ON);
            break;
      default:
            return -EINVAL;
      }
      /* Executing CP15 (Wait-for-Interrupt) Instruction */
      cpu_do_idle();
      return 0;
}

/*
 * Called after processes are frozen, but before we shut down devices.
 */
static int mx35_suspend_prepare(void)
{
      suspend_ops_started = 1;
      return 0;
}

/*
 * Called after devices are re-setup, but before processes are thawed.
 */
static void mx35_suspend_finish(void)
{
      suspend_ops_started = 0;
}

static int mx35_pm_valid(suspend_state_t state)
{
      return (state > PM_SUSPEND_ON && state <= PM_SUSPEND_MAX);
}

struct platform_suspend_ops mx35_suspend_ops = {
      .valid = mx35_pm_valid,
      .prepare = mx35_suspend_prepare,
      .enter = mx35_suspend_enter,
      .finish = mx35_suspend_finish,
};

static int __init mx35_pm_init(void)
{
      pr_info("Static Power Management for Freescale i.MX35\n");
      suspend_set_ops(&mx35_suspend_ops);

      return 0;
}

late_initcall(mx35_pm_init);

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