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TOMOYO Linux Cross Reference
Linux/arch/arm/mach-tegra/cpuidle-tegra30.c

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  1 /*
  2  * CPU idle driver for Tegra CPUs
  3  *
  4  * Copyright (c) 2010-2012, NVIDIA Corporation.
  5  * Copyright (c) 2011 Google, Inc.
  6  * Author: Colin Cross <ccross@android.com>
  7  *         Gary King <gking@nvidia.com>
  8  *
  9  * Rework for 3.3 by Peter De Schrijver <pdeschrijver@nvidia.com>
 10  *
 11  * This program is free software; you can redistribute it and/or modify
 12  * it under the terms of the GNU General Public License as published by
 13  * the Free Software Foundation; either version 2 of the License, or
 14  * (at your option) any later version.
 15  *
 16  * This program is distributed in the hope that it will be useful, but WITHOUT
 17  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 18  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 19  * more details.
 20  */
 21 
 22 #include <linux/clk/tegra.h>
 23 #include <linux/tick.h>
 24 #include <linux/cpuidle.h>
 25 #include <linux/cpu_pm.h>
 26 #include <linux/kernel.h>
 27 #include <linux/module.h>
 28 
 29 #include <asm/cpuidle.h>
 30 #include <asm/smp_plat.h>
 31 #include <asm/suspend.h>
 32 
 33 #include "cpuidle.h"
 34 #include "pm.h"
 35 #include "sleep.h"
 36 
 37 #ifdef CONFIG_PM_SLEEP
 38 static int tegra30_idle_lp2(struct cpuidle_device *dev,
 39                             struct cpuidle_driver *drv,
 40                             int index);
 41 #endif
 42 
 43 static struct cpuidle_driver tegra_idle_driver = {
 44         .name = "tegra_idle",
 45         .owner = THIS_MODULE,
 46 #ifdef CONFIG_PM_SLEEP
 47         .state_count = 2,
 48 #else
 49         .state_count = 1,
 50 #endif
 51         .states = {
 52                 [0] = ARM_CPUIDLE_WFI_STATE_PWR(600),
 53 #ifdef CONFIG_PM_SLEEP
 54                 [1] = {
 55                         .enter                  = tegra30_idle_lp2,
 56                         .exit_latency           = 2000,
 57                         .target_residency       = 2200,
 58                         .power_usage            = 0,
 59                         .name                   = "powered-down",
 60                         .desc                   = "CPU power gated",
 61                 },
 62 #endif
 63         },
 64 };
 65 
 66 #ifdef CONFIG_PM_SLEEP
 67 static bool tegra30_cpu_cluster_power_down(struct cpuidle_device *dev,
 68                                            struct cpuidle_driver *drv,
 69                                            int index)
 70 {
 71         /* All CPUs entering LP2 is not working.
 72          * Don't let CPU0 enter LP2 when any secondary CPU is online.
 73          */
 74         if (num_online_cpus() > 1 || !tegra_cpu_rail_off_ready()) {
 75                 cpu_do_idle();
 76                 return false;
 77         }
 78 
 79         tick_broadcast_enter();
 80 
 81         tegra_idle_lp2_last();
 82 
 83         tick_broadcast_exit();
 84 
 85         return true;
 86 }
 87 
 88 #ifdef CONFIG_SMP
 89 static bool tegra30_cpu_core_power_down(struct cpuidle_device *dev,
 90                                         struct cpuidle_driver *drv,
 91                                         int index)
 92 {
 93         tick_broadcast_enter();
 94 
 95         smp_wmb();
 96 
 97         cpu_suspend(0, tegra30_sleep_cpu_secondary_finish);
 98 
 99         tick_broadcast_exit();
100 
101         return true;
102 }
103 #else
104 static inline bool tegra30_cpu_core_power_down(struct cpuidle_device *dev,
105                                                struct cpuidle_driver *drv,
106                                                int index)
107 {
108         return true;
109 }
110 #endif
111 
112 static int tegra30_idle_lp2(struct cpuidle_device *dev,
113                             struct cpuidle_driver *drv,
114                             int index)
115 {
116         bool entered_lp2 = false;
117         bool last_cpu;
118 
119         local_fiq_disable();
120 
121         last_cpu = tegra_set_cpu_in_lp2();
122         cpu_pm_enter();
123 
124         if (dev->cpu == 0) {
125                 if (last_cpu)
126                         entered_lp2 = tegra30_cpu_cluster_power_down(dev, drv,
127                                                                      index);
128                 else
129                         cpu_do_idle();
130         } else {
131                 entered_lp2 = tegra30_cpu_core_power_down(dev, drv, index);
132         }
133 
134         cpu_pm_exit();
135         tegra_clear_cpu_in_lp2();
136 
137         local_fiq_enable();
138 
139         smp_rmb();
140 
141         return (entered_lp2) ? index : 0;
142 }
143 #endif
144 
145 int __init tegra30_cpuidle_init(void)
146 {
147         return cpuidle_register(&tegra_idle_driver, NULL);
148 }
149 

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