linux/arch/mips/jz4740/pm.c
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   1/*
   2 *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
   3 *      JZ4740 SoC power management support
   4 *
   5 *  This program is free software; you can redistribute it and/or modify it
   6 *  under  the terms of the GNU General  Public License as published by the
   7 *  Free Software Foundation;  either version 2 of the License, or (at your
   8 *  option) any later version.
   9 *
  10 *  You should have received a copy of the GNU General Public License along
  11 *  with this program; if not, write to the Free Software Foundation, Inc.,
  12 *  675 Mass Ave, Cambridge, MA 02139, USA.
  13 *
  14 */
  15
  16#include <linux/init.h>
  17#include <linux/pm.h>
  18#include <linux/delay.h>
  19#include <linux/suspend.h>
  20
  21#include <asm/mach-jz4740/clock.h>
  22
  23#include "clock.h"
  24#include "irq.h"
  25
  26static int jz4740_pm_enter(suspend_state_t state)
  27{
  28        jz4740_intc_suspend();
  29        jz4740_clock_suspend();
  30
  31        jz4740_clock_set_wait_mode(JZ4740_WAIT_MODE_SLEEP);
  32
  33        __asm__(".set\tmips3\n\t"
  34                "wait\n\t"
  35                ".set\tmips0");
  36
  37        jz4740_clock_set_wait_mode(JZ4740_WAIT_MODE_IDLE);
  38
  39        jz4740_clock_resume();
  40        jz4740_intc_resume();
  41
  42        return 0;
  43}
  44
  45static const struct platform_suspend_ops jz4740_pm_ops = {
  46        .valid          = suspend_valid_only_mem,
  47        .enter          = jz4740_pm_enter,
  48};
  49
  50static int __init jz4740_pm_init(void)
  51{
  52        suspend_set_ops(&jz4740_pm_ops);
  53        return 0;
  54
  55}
  56late_initcall(jz4740_pm_init);
  57