target/linux/xburst/files-2.6.32/arch/mips/jz4740/pm.c

   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 #include <asm/mach-jz4740/regs.h>
  21 #include <asm/mach-jz4740/clock.h>
  22
  23 extern void jz4740_intc_suspend(void);
  24 extern void jz4740_intc_resume(void);
  25
  26 static int jz_pm_enter(suspend_state_t state)
  27 {
  28         jz4740_intc_suspend();
  29
  30         jz4740_clock_set_wait_mode(JZ4740_WAIT_MODE_SLEEP);
  31
  32         __asm__(".set\tmips3\n\t"
  33                 "wait\n\t"
  34                 ".set\tmips0");
  35
  36         jz4740_clock_set_wait_mode(JZ4740_WAIT_MODE_IDLE);
  37
  38         jz4740_intc_resume();
  39
  40         return 0;
  41 }
  42
  43 static struct platform_suspend_ops jz_pm_ops = {
  44         .valid          = suspend_valid_only_mem,
  45         .enter          = jz_pm_enter,
  46 };
  47
  48 /*
  49  * Initialize power interface
  50  */
  51 int __init jz_pm_init(void)
  52 {
  53         suspend_set_ops(&jz_pm_ops);
  54         return 0;
  55
  56 }
  57 late_initcall(jz_pm_init);