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pm-imx27.c

/*
 * i.MX27 Power Management Routines
 *
 * Based on Freescale's BSP
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License.
 */

#include <linux/kernel.h>
#include <linux/suspend.h>
#include <linux/io.h>
#include <mach/system.h>
#include <mach/mx27.h>

static int mx27_suspend_enter(suspend_state_t state)
{
      u32 cscr;
      switch (state) {
      case PM_SUSPEND_MEM:
            /* Clear MPEN and SPEN to disable MPLL/SPLL */
            cscr = __raw_readl(MX27_IO_ADDRESS(MX27_CCM_BASE_ADDR));
            cscr &= 0xFFFFFFFC;
            __raw_writel(cscr, MX27_IO_ADDRESS(MX27_CCM_BASE_ADDR));
            /* Executes WFI */
            arch_idle();
            break;

      default:
            return -EINVAL;
      }
      return 0;
}

static const struct platform_suspend_ops mx27_suspend_ops = {
      .enter = mx27_suspend_enter,
      .valid = suspend_valid_only_mem,
};

static int __init mx27_pm_init(void)
{
      if (!cpu_is_mx27())
            return 0;

      suspend_set_ops(&mx27_suspend_ops);
      return 0;
}

device_initcall(mx27_pm_init);

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