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22b8b85d PDS |
1 | /* |
2 | * arch/arm/mach-tegra/cpuidle.c | |
3 | * | |
4 | * CPU idle driver for Tegra CPUs | |
5 | * | |
6 | * Copyright (c) 2010-2012, NVIDIA Corporation. | |
7 | * Copyright (c) 2011 Google, Inc. | |
8 | * Author: Colin Cross <ccross@android.com> | |
9 | * Gary King <gking@nvidia.com> | |
10 | * | |
11 | * Rework for 3.3 by Peter De Schrijver <pdeschrijver@nvidia.com> | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License as published by | |
15 | * the Free Software Foundation; either version 2 of the License, or | |
16 | * (at your option) any later version. | |
17 | * | |
18 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
19 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
20 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
21 | * more details. | |
22 | */ | |
23 | ||
24 | #include <linux/kernel.h> | |
25 | #include <linux/module.h> | |
26 | #include <linux/cpu.h> | |
27 | #include <linux/cpuidle.h> | |
28 | #include <linux/hrtimer.h> | |
29 | ||
30 | #include <mach/iomap.h> | |
31 | ||
32 | extern void tegra_cpu_wfi(void); | |
33 | ||
34 | static int tegra_idle_enter_lp3(struct cpuidle_device *dev, | |
35 | struct cpuidle_driver *drv, int index); | |
36 | ||
37 | struct cpuidle_driver tegra_idle_driver = { | |
38 | .name = "tegra_idle", | |
39 | .owner = THIS_MODULE, | |
40 | .state_count = 1, | |
41 | .states = { | |
42 | [0] = { | |
43 | .enter = tegra_idle_enter_lp3, | |
44 | .exit_latency = 10, | |
45 | .target_residency = 10, | |
46 | .power_usage = 600, | |
47 | .flags = CPUIDLE_FLAG_TIME_VALID, | |
48 | .name = "LP3", | |
49 | .desc = "CPU flow-controlled", | |
50 | }, | |
51 | }, | |
52 | }; | |
53 | ||
54 | static DEFINE_PER_CPU(struct cpuidle_device, tegra_idle_device); | |
55 | ||
56 | static int tegra_idle_enter_lp3(struct cpuidle_device *dev, | |
57 | struct cpuidle_driver *drv, int index) | |
58 | { | |
59 | ktime_t enter, exit; | |
60 | s64 us; | |
61 | ||
62 | local_irq_disable(); | |
63 | local_fiq_disable(); | |
64 | ||
65 | enter = ktime_get(); | |
66 | ||
67 | tegra_cpu_wfi(); | |
68 | ||
69 | exit = ktime_sub(ktime_get(), enter); | |
70 | us = ktime_to_us(exit); | |
71 | ||
72 | local_fiq_enable(); | |
73 | local_irq_enable(); | |
74 | ||
75 | dev->last_residency = us; | |
76 | ||
77 | return index; | |
78 | } | |
79 | ||
80 | static int __init tegra_cpuidle_init(void) | |
81 | { | |
82 | int ret; | |
83 | unsigned int cpu; | |
84 | struct cpuidle_device *dev; | |
85 | struct cpuidle_driver *drv = &tegra_idle_driver; | |
86 | ||
87 | ret = cpuidle_register_driver(&tegra_idle_driver); | |
88 | if (ret) { | |
89 | pr_err("CPUidle driver registration failed\n"); | |
90 | return ret; | |
91 | } | |
92 | ||
93 | for_each_possible_cpu(cpu) { | |
94 | dev = &per_cpu(tegra_idle_device, cpu); | |
95 | dev->cpu = cpu; | |
96 | ||
97 | dev->state_count = drv->state_count; | |
98 | ret = cpuidle_register_device(dev); | |
99 | if (ret) { | |
100 | pr_err("CPU%u: CPUidle device registration failed\n", | |
101 | cpu); | |
102 | return ret; | |
103 | } | |
104 | } | |
105 | return 0; | |
106 | } | |
107 | device_initcall(tegra_cpuidle_init); |