arch/arm/mach-highbank/pm.c

   1 /*
   2  * Copyright 2011 Calxeda, Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program.  If not, see <http://www.gnu.org/licenses/>.
  15  */
  16
  17 #include <linux/cpu_pm.h>
  18 #include <linux/init.h>
  19 #include <linux/suspend.h>
  20
  21 #include <asm/suspend.h>
  22 #include <asm/psci.h>
  23
  24 static int highbank_suspend_finish(unsigned long val)
  25 {
  26         const struct psci_power_state ps = {
  27                 .type = PSCI_POWER_STATE_TYPE_POWER_DOWN,
  28                 .affinity_level = 1,
  29         };
  30
  31         return psci_ops.cpu_suspend(ps, __pa(cpu_resume));
  32 }
  33
  34 static int highbank_pm_enter(suspend_state_t state)
  35 {
  36         cpu_pm_enter();
  37         cpu_cluster_pm_enter();
  38
  39         cpu_suspend(0, highbank_suspend_finish);
  40
  41         cpu_cluster_pm_exit();
  42         cpu_pm_exit();
  43
  44         return 0;
  45 }
  46
  47 static const struct platform_suspend_ops highbank_pm_ops = {
  48         .enter = highbank_pm_enter,
  49         .valid = suspend_valid_only_mem,
  50 };
  51
  52 void __init highbank_pm_init(void)
  53 {
  54         if (!psci_ops.cpu_suspend)
  55                 return;
  56
  57         suspend_set_ops(&highbank_pm_ops);
  58 }