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/psci.h>
  20 #include <linux/suspend.h>
  21
  22 #include <asm/suspend.h>
  23
  24 #include <uapi/linux/psci.h>
  25
  26 #define HIGHBANK_SUSPEND_PARAM \
  27         ((0 << PSCI_0_2_POWER_STATE_ID_SHIFT) | \
  28          (1 << PSCI_0_2_POWER_STATE_AFFL_SHIFT) | \
  29          (PSCI_POWER_STATE_TYPE_POWER_DOWN << PSCI_0_2_POWER_STATE_TYPE_SHIFT))
  30
  31 static int highbank_suspend_finish(unsigned long val)
  32 {
  33         return psci_ops.cpu_suspend(HIGHBANK_SUSPEND_PARAM, __pa(cpu_resume));
  34 }
  35
  36 static int highbank_pm_enter(suspend_state_t state)
  37 {
  38         cpu_pm_enter();
  39         cpu_cluster_pm_enter();
  40
  41         cpu_suspend(0, highbank_suspend_finish);
  42
  43         cpu_cluster_pm_exit();
  44         cpu_pm_exit();
  45
  46         return 0;
  47 }
  48
  49 static const struct platform_suspend_ops highbank_pm_ops = {
  50         .enter = highbank_pm_enter,
  51         .valid = suspend_valid_only_mem,
  52 };
  53
  54 void __init highbank_pm_init(void)
  55 {
  56         if (!psci_ops.cpu_suspend)
  57                 return;
  58
  59         suspend_set_ops(&highbank_pm_ops);
  60 }