108 lines
2.5 KiB
C
108 lines
2.5 KiB
C
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/*
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* arch/arm/mach-tegra/cpuidle.c
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*
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* CPU idle driver for Tegra CPUs
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*
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* Copyright (c) 2010-2012, NVIDIA Corporation.
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* Copyright (c) 2011 Google, Inc.
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* Author: Colin Cross <ccross@android.com>
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* Gary King <gking@nvidia.com>
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*
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* Rework for 3.3 by Peter De Schrijver <pdeschrijver@nvidia.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/cpu.h>
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#include <linux/cpuidle.h>
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#include <linux/hrtimer.h>
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#include <mach/iomap.h>
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extern void tegra_cpu_wfi(void);
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static int tegra_idle_enter_lp3(struct cpuidle_device *dev,
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struct cpuidle_driver *drv, int index);
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struct cpuidle_driver tegra_idle_driver = {
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.name = "tegra_idle",
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.owner = THIS_MODULE,
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.state_count = 1,
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.states = {
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[0] = {
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.enter = tegra_idle_enter_lp3,
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.exit_latency = 10,
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.target_residency = 10,
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.power_usage = 600,
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.flags = CPUIDLE_FLAG_TIME_VALID,
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.name = "LP3",
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.desc = "CPU flow-controlled",
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},
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},
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};
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static DEFINE_PER_CPU(struct cpuidle_device, tegra_idle_device);
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static int tegra_idle_enter_lp3(struct cpuidle_device *dev,
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struct cpuidle_driver *drv, int index)
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{
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ktime_t enter, exit;
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s64 us;
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local_irq_disable();
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local_fiq_disable();
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enter = ktime_get();
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tegra_cpu_wfi();
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exit = ktime_sub(ktime_get(), enter);
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us = ktime_to_us(exit);
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local_fiq_enable();
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local_irq_enable();
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dev->last_residency = us;
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return index;
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}
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static int __init tegra_cpuidle_init(void)
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{
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int ret;
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unsigned int cpu;
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struct cpuidle_device *dev;
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struct cpuidle_driver *drv = &tegra_idle_driver;
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ret = cpuidle_register_driver(&tegra_idle_driver);
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if (ret) {
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pr_err("CPUidle driver registration failed\n");
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return ret;
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}
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for_each_possible_cpu(cpu) {
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dev = &per_cpu(tegra_idle_device, cpu);
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dev->cpu = cpu;
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dev->state_count = drv->state_count;
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ret = cpuidle_register_device(dev);
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if (ret) {
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pr_err("CPU%u: CPUidle device registration failed\n",
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cpu);
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return ret;
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}
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}
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return 0;
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}
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device_initcall(tegra_cpuidle_init);
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