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/*
* drivers/misc/force_idle_t132.c
*
* Copyright (C) 2014 NVIDIA Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/debugfs.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/ktime.h>
#include <linux/interrupt.h>
#include <linux/suspend.h>
#include <linux/tick.h>
#include <linux/workqueue.h>
#include <linux/irq.h>
#include <linux/timer.h>
#include <linux/jiffies.h>
#include <linux/interrupt.h>
#include <linux/tick.h>
#include <linux/gpio.h>
#include <linux/tegra-soc.h>
#include <mach/pinmux-defines.h>
#include <mach/pinmux-t12.h>
#include "../../arch/arm/mach-tegra/gpio-names.h"
#include "../../kernel/irq/internals.h"
#define LEN 200
#define DEBUG_HOOKS 1
#define DBG_PRINT(fmt, arg...) pr_err(fmt, ## arg)
#define POWER_BACKDOOR_I2C_CC4_VOLTAGE_DOWN 0x14
#define POWER_BACKDOOR_I2C_CC4_VOLTAGE_UP 0x15
static struct dentry *dfs_dir;
static char ker_buf[LEN];
static u64 pmstate = 5;
/* Forces idle every time_interval seconds */
static u64 time_interval_sec = 2;
static struct delayed_work cpus_idle_work;
static void tegra132_do_idle(ulong pmstate)
{
asm volatile(
" msr actlr_el1, %0\n"
" wfi\n"
:
: "r" (pmstate));
}
static void force_idle_work_func(struct work_struct *work)
{
tegra132_do_idle(pmstate);
}
/* Force idle on all online cpus */
static void force_idle_cpus_work(struct work_struct *work)
{
schedule_on_each_cpu(force_idle_work_func);
schedule_delayed_work(&cpus_idle_work,
msecs_to_jiffies(time_interval_sec * 1000));
}
static int __init init_debug(void)
{
struct dentry *dfs_file;
int filevalue;
if (tegra_revision > TEGRA_REVISION_A01)
return 0;
dfs_dir = debugfs_create_dir("force_idle", NULL);
dfs_file = debugfs_create_u64("time_interval_sec", 0644, dfs_dir,
&time_interval_sec);
if (!dfs_file) {
DBG_PRINT("error creating time_interval_sec file");
return -ENODEV;
}
dfs_file = debugfs_create_u64("pmstate", 0644, dfs_dir,
&pmstate);
if (!dfs_file) {
DBG_PRINT("error creating pmstate file");
return -ENODEV;
}
INIT_DEFERRABLE_WORK(&cpus_idle_work, force_idle_cpus_work);
schedule_delayed_work(&cpus_idle_work,
msecs_to_jiffies(time_interval_sec * 1000));
return 0;
}
module_init(init_debug);
static void __exit exit_debug(void)
{
debugfs_remove_recursive(dfs_dir);
cancel_delayed_work_sync(&cpus_idle_work);
}
module_exit(exit_debug);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Force idle");
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