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 "pm.h"
30 #include "sleep.h"
31
32 #ifdef CONFIG_PM_SLEEP
33 #define TEGRA114_MAX_STATES 2
34 #else
35 #define TEGRA114_MAX_STATES 1
36 #endif
37
38 #ifdef CONFIG_PM_SLEEP
tegra114_idle_power_down(struct cpuidle_device * dev,struct cpuidle_driver * drv,int index)39 static int tegra114_idle_power_down(struct cpuidle_device *dev,
40 struct cpuidle_driver *drv,
41 int index)
42 {
43 local_fiq_disable();
44
45 tegra_set_cpu_in_lp2();
46 cpu_pm_enter();
47
48 call_firmware_op(prepare_idle);
49
50 /* Do suspend by ourselves if the firmware does not implement it */
51 if (call_firmware_op(do_idle, 0) == -ENOSYS)
52 cpu_suspend(0, tegra30_sleep_cpu_secondary_finish);
53
54 cpu_pm_exit();
55 tegra_clear_cpu_in_lp2();
56
57 local_fiq_enable();
58
59 return index;
60 }
61
tegra114_idle_enter_freeze(struct cpuidle_device * dev,struct cpuidle_driver * drv,int index)62 static void tegra114_idle_enter_freeze(struct cpuidle_device *dev,
63 struct cpuidle_driver *drv,
64 int index)
65 {
66 tegra114_idle_power_down(dev, drv, index);
67 }
68 #endif
69
70 static struct cpuidle_driver tegra_idle_driver = {
71 .name = "tegra_idle",
72 .owner = THIS_MODULE,
73 .state_count = TEGRA114_MAX_STATES,
74 .states = {
75 [0] = ARM_CPUIDLE_WFI_STATE_PWR(600),
76 #ifdef CONFIG_PM_SLEEP
77 [1] = {
78 .enter = tegra114_idle_power_down,
79 .enter_freeze = tegra114_idle_enter_freeze,
80 .exit_latency = 500,
81 .target_residency = 1000,
82 .flags = CPUIDLE_FLAG_TIMER_STOP,
83 .power_usage = 0,
84 .name = "powered-down",
85 .desc = "CPU power gated",
86 },
87 #endif
88 },
89 };
90
tegra114_cpuidle_init(void)91 int __init tegra114_cpuidle_init(void)
92 {
93 if (!psci_smp_available())
94 return cpuidle_register(&tegra_idle_driver, NULL);
95
96 return 0;
97 }
98