arch/arm/mach-imx/pm-imx6q.c

   1 /*
   2  * Copyright 2011 Freescale Semiconductor, Inc.
   3  * Copyright 2011 Linaro Ltd.
   4  *
   5  * The code contained herein is licensed under the GNU General Public
   6  * License. You may obtain a copy of the GNU General Public License
   7  * Version 2 or later at the following locations:
   8  *
   9  * http://www.opensource.org/licenses/gpl-license.html
  10  * http://www.gnu.org/copyleft/gpl.html
  11  */
  12
  13 #include <linux/init.h>
  14 #include <linux/io.h>
  15 #include <linux/of.h>
  16 #include <linux/suspend.h>
  17 #include <asm/cacheflush.h>
  18 #include <asm/proc-fns.h>
  19 #include <asm/suspend.h>
  20 #include <asm/hardware/cache-l2x0.h>
  21
  22 #include "common.h"
  23 #include "hardware.h"
  24
  25 static int imx6q_suspend_finish(unsigned long val)
  26 {
  27         cpu_do_idle();
  28         return 0;
  29 }
  30
  31 static int imx6q_pm_enter(suspend_state_t state)
  32 {
  33         switch (state) {
  34         case PM_SUSPEND_MEM:
  35                 imx6q_set_lpm(STOP_POWER_OFF);
  36                 imx_gpc_pre_suspend();
  37                 imx_set_cpu_jump(0, v7_cpu_resume);
  38                 /* Zzz ... */
  39                 cpu_suspend(0, imx6q_suspend_finish);
  40                 imx_smp_prepare();
  41                 imx_gpc_post_resume();
  42                 imx6q_set_lpm(WAIT_CLOCKED);
  43                 break;
  44         default:
  45                 return -EINVAL;
  46         }
  47
  48         return 0;
  49 }
  50
  51 static const struct platform_suspend_ops imx6q_pm_ops = {
  52         .enter = imx6q_pm_enter,
  53         .valid = suspend_valid_only_mem,
  54 };
  55
  56 void __init imx6q_pm_init(void)
  57 {
  58         suspend_set_ops(&imx6q_pm_ops);
  59 }