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