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

/*
 * Copyright (c) 2013, NVIDIA Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/cpuidle.h>

#include <asm/cpuidle.h>

static struct cpuidle_driver tegra_idle_driver = {
	.name = "tegra_idle",
	.owner = THIS_MODULE,
	.en_core_tk_irqen = 1,
	.state_count = 1,
	.states = {
		[0] = ARM_CPUIDLE_WFI_STATE_PWR(600),
	},
};

static DEFINE_PER_CPU(struct cpuidle_device, tegra_idle_device);

int __init tegra114_cpuidle_init(void)
{
	int ret;
	unsigned int cpu;
	struct cpuidle_device *dev;
	struct cpuidle_driver *drv = &tegra_idle_driver;

	ret = cpuidle_register_driver(&tegra_idle_driver);
	if (ret) {
		pr_err("CPUidle driver registration failed\n");
		return ret;
	}

	for_each_possible_cpu(cpu) {
		dev = &per_cpu(tegra_idle_device, cpu);
		dev->cpu = cpu;

		dev->state_count = drv->state_count;
		ret = cpuidle_register_device(dev);
		if (ret) {
			pr_err("CPU%u: CPUidle device registration failed\n",
				cpu);
			return ret;
		}
	}
	return 0;
}