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
tegra114_idle_power_down(struct cpuidle_device * dev,struct cpuidle_driver * drv,int index)38 static 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
66 static 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
tegra114_cpuidle_init(void)85 int __init tegra114_cpuidle_init(void)
86 {
87 return cpuidle_register(&tegra_idle_driver, NULL);
88 }
89