arch/arm/mach-tegra/cpuidle-tegra114.c

   1 /*
   2  * Copyright (c) 2013, NVIDIA Corporation. All rights reserved.
   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
  14  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15  */
  16
  17 #include <linux/kernel.h>
  18 #include <linux/module.h>
  19 #include <linux/cpuidle.h>
  20 #include <linux/cpu_pm.h>
  21 #include <linux/clockchips.h>
  22
  23 #include <asm/cpuidle.h>
  24 #include <asm/suspend.h>
  25 #include <asm/smp_plat.h>
  26
  27 #include "pm.h"
  28 #include "sleep.h"
  29
  30 #ifdef CONFIG_PM_SLEEP
  31 #define TEGRA114_MAX_STATES 2
  32 #else
  33 #define TEGRA114_MAX_STATES 1
  34 #endif
  35
  36 #ifdef CONFIG_PM_SLEEP
  37 static int tegra114_idle_power_down(struct cpuidle_device *dev,
  38                                     struct cpuidle_driver *drv,
  39                                     int index)
  40 {
  41         local_fiq_disable();
  42
  43         tegra_set_cpu_in_lp2();
  44         cpu_pm_enter();
  45
  46         clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_ENTER, &dev->cpu);
  47
  48         cpu_suspend(0, tegra30_sleep_cpu_secondary_finish);
  49
  50         clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_EXIT, &dev->cpu);
  51
  52         cpu_pm_exit();
  53         tegra_clear_cpu_in_lp2();
  54
  55         local_fiq_enable();
  56
  57         return index;
  58 }
  59 #endif
  60
  61 static struct cpuidle_driver tegra_idle_driver = {
  62         .name = "tegra_idle",
  63         .owner = THIS_MODULE,
  64         .state_count = TEGRA114_MAX_STATES,
  65         .states = {
  66                 [0] = ARM_CPUIDLE_WFI_STATE_PWR(600),
  67 #ifdef CONFIG_PM_SLEEP
  68                 [1] = {
  69                         .enter                  = tegra114_idle_power_down,
  70                         .exit_latency           = 500,
  71                         .target_residency       = 1000,
  72                         .power_usage            = 0,
  73                         .flags                  = CPUIDLE_FLAG_TIME_VALID,
  74                         .name                   = "powered-down",
  75                         .desc                   = "CPU power gated",
  76                 },
  77 #endif
  78         },
  79 };
  80
  81 int __init tegra114_cpuidle_init(void)
  82 {
  83         return cpuidle_register(&tegra_idle_driver, NULL);
  84 }