linux/arch/arm/mach-imx/pm-imx27.c
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   1/*
   2 * i.MX27 Power Management Routines
   3 *
   4 * Based on Freescale's BSP
   5 *
   6 * This program is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU General Public License.
   8 */
   9
  10#include <linux/of_address.h>
  11#include <linux/kernel.h>
  12#include <linux/suspend.h>
  13#include <linux/io.h>
  14
  15#include "common.h"
  16#include "hardware.h"
  17
  18static int mx27_suspend_enter(suspend_state_t state)
  19{
  20        void __iomem *ccm_base;
  21        struct device_node *np;
  22        u32 cscr;
  23
  24        np = of_find_compatible_node(NULL, NULL, "fsl,imx27-ccm");
  25        ccm_base = of_iomap(np, 0);
  26        BUG_ON(!ccm_base);
  27
  28        switch (state) {
  29        case PM_SUSPEND_MEM:
  30                /* Clear MPEN and SPEN to disable MPLL/SPLL */
  31                cscr = imx_readl(ccm_base);
  32                cscr &= 0xFFFFFFFC;
  33                imx_writel(cscr, ccm_base);
  34                /* Executes WFI */
  35                cpu_do_idle();
  36                break;
  37
  38        default:
  39                return -EINVAL;
  40        }
  41        return 0;
  42}
  43
  44static const struct platform_suspend_ops mx27_suspend_ops = {
  45        .enter = mx27_suspend_enter,
  46        .valid = suspend_valid_only_mem,
  47};
  48
  49void __init imx27_pm_init(void)
  50{
  51        suspend_set_ops(&mx27_suspend_ops);
  52}
  53