arch/mips/jz4740/pm.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
   4  *      JZ4740 SoC power management support
   5  */
   6
   7 #include <linux/init.h>
   8 #include <linux/pm.h>
   9 #include <linux/delay.h>
  10 #include <linux/suspend.h>
  11
  12 #include <asm/mach-jz4740/clock.h>
  13
  14 static int jz4740_pm_enter(suspend_state_t state)
  15 {
  16         jz4740_clock_suspend();
  17
  18         jz4740_clock_set_wait_mode(JZ4740_WAIT_MODE_SLEEP);
  19
  20         __asm__(".set\tmips3\n\t"
  21                 "wait\n\t"
  22                 ".set\tmips0");
  23
  24         jz4740_clock_set_wait_mode(JZ4740_WAIT_MODE_IDLE);
  25
  26         jz4740_clock_resume();
  27
  28         return 0;
  29 }
  30
  31 static const struct platform_suspend_ops jz4740_pm_ops = {
  32         .valid          = suspend_valid_only_mem,
  33         .enter          = jz4740_pm_enter,
  34 };
  35
  36 static int __init jz4740_pm_init(void)
  37 {
  38         suspend_set_ops(&jz4740_pm_ops);
  39         return 0;
  40
  41 }
  42 late_initcall(jz4740_pm_init);