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 #include <asm/psci.h>
28
29 #include "cpuidle.h"
30 #include "pm.h"
31 #include "sleep.h"
32
33 #ifdef CONFIG_PM_SLEEP
34 #define TEGRA114_MAX_STATES 2
35 #else
36 #define TEGRA114_MAX_STATES 1
37 #endif
38
39 #ifdef CONFIG_PM_SLEEP
tegra114_idle_power_down(struct cpuidle_device * dev,struct cpuidle_driver * drv,int index)40 static int tegra114_idle_power_down(struct cpuidle_device *dev,
41 struct cpuidle_driver *drv,
42 int index)
43 {
44 local_fiq_disable();
45
46 tegra_set_cpu_in_lp2();
47 cpu_pm_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 cpu_pm_exit();
56 tegra_clear_cpu_in_lp2();
57
58 local_fiq_enable();
59
60 return index;
61 }
62
tegra114_idle_enter_s2idle(struct cpuidle_device * dev,struct cpuidle_driver * drv,int index)63 static void tegra114_idle_enter_s2idle(struct cpuidle_device *dev,
64 struct cpuidle_driver *drv,
65 int index)
66 {
67 tegra114_idle_power_down(dev, drv, index);
68 }
69 #endif
70
71 static struct cpuidle_driver tegra_idle_driver = {
72 .name = "tegra_idle",
73 .owner = THIS_MODULE,
74 .state_count = TEGRA114_MAX_STATES,
75 .states = {
76 [0] = ARM_CPUIDLE_WFI_STATE_PWR(600),
77 #ifdef CONFIG_PM_SLEEP
78 [1] = {
79 .enter = tegra114_idle_power_down,
80 .enter_s2idle = tegra114_idle_enter_s2idle,
81 .exit_latency = 500,
82 .target_residency = 1000,
83 .flags = CPUIDLE_FLAG_TIMER_STOP,
84 .power_usage = 0,
85 .name = "powered-down",
86 .desc = "CPU power gated",
87 },
88 #endif
89 },
90 };
91
tegra114_cpuidle_init(void)92 int __init tegra114_cpuidle_init(void)
93 {
94 if (!psci_smp_available())
95 return cpuidle_register(&tegra_idle_driver, NULL);
96
97 return 0;
98 }
99