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 <asm/firmware.h>
  18 #include <linux/tick.h>
  19 #include <linux/cpuidle.h>
  20 #include <linux/cpu_pm.h>
  21 #include <linux/kernel.h>
  22 #include <linux/module.h>
  23
  24 #include <asm/cpuidle.h>
  25 #include <asm/smp_plat.h>
  26 #include <asm/suspend.h>
  27 #include <asm/psci.h>
  28
  29 #include "pm.h"
  30 #include "sleep.h"
  31
  32 #ifdef CONFIG_PM_SLEEP
  33 #define TEGRA114_MAX_STATES 2
  34 #else
  35 #define TEGRA114_MAX_STATES 1
  36 #endif
  37
  38 #ifdef CONFIG_PM_SLEEP
  39 static int tegra114_idle_power_down(struct cpuidle_device *dev,
  40                                     struct cpuidle_driver *drv,
  41                                     int index)
  42 {
  43         local_fiq_disable();
  44
  45         tegra_set_cpu_in_lp2();
  46         cpu_pm_enter();
  47
  48         tick_broadcast_enter();
  49
  50         call_firmware_op(prepare_idle);
  51
  52         /* Do suspend by ourselves if the firmware does not implement it */
  53         if (call_firmware_op(do_idle, 0) == -ENOSYS)
  54                 cpu_suspend(0, tegra30_sleep_cpu_secondary_finish);
  55
  56         tick_broadcast_exit();
  57
  58         cpu_pm_exit();
  59         tegra_clear_cpu_in_lp2();
  60
  61         local_fiq_enable();
  62
  63         return index;
  64 }
  65 #endif
  66
  67 static struct cpuidle_driver tegra_idle_driver = {
  68         .name = "tegra_idle",
  69         .owner = THIS_MODULE,
  70         .state_count = TEGRA114_MAX_STATES,
  71         .states = {
  72                 [0] = ARM_CPUIDLE_WFI_STATE_PWR(600),
  73 #ifdef CONFIG_PM_SLEEP
  74                 [1] = {
  75                         .enter                  = tegra114_idle_power_down,
  76                         .exit_latency           = 500,
  77                         .target_residency       = 1000,
  78                         .power_usage            = 0,
  79                         .name                   = "powered-down",
  80                         .desc                   = "CPU power gated",
  81                 },
  82 #endif
  83         },
  84 };
  85
  86 int __init tegra114_cpuidle_init(void)
  87 {
  88         if (!psci_smp_available())
  89                 return cpuidle_register(&tegra_idle_driver, NULL);
  90
  91         return 0;
  92 }