summaryrefslogtreecommitdiff
path: root/drivers/cpuidle/cpuidle-mvebu-v7.c
blob: 18ded9e7cb3447ba665a85e496fdaf8135c1c5f3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
/*
 * Marvell Armada 370, 38x and XP SoC cpuidle driver
 *
 * Copyright (C) 2014 Marvell
 *
 * Nadav Haklai <nadavh@marvell.com>
 * Gregory CLEMENT <gregory.clement@free-electrons.com>
 *
 * This file is licensed under the terms of the GNU General Public
 * License version 2.  This program is licensed "as is" without any
 * warranty of any kind, whether express or implied.
 *
 * Maintainer: Gregory CLEMENT <gregory.clement@free-electrons.com>
 */

#include <linux/cpu_pm.h>
#include <linux/cpuidle.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/suspend.h>
#include <linux/platform_device.h>
#include <asm/cpuidle.h>

#define MVEBU_V7_FLAG_DEEP_IDLE	0x10000

static int (*mvebu_v7_cpu_suspend)(int);

static int mvebu_v7_enter_idle(struct cpuidle_device *dev,
				struct cpuidle_driver *drv,
				int index)
{
	int ret;
	bool deepidle = false;
	cpu_pm_enter();

	if (drv->states[index].flags & MVEBU_V7_FLAG_DEEP_IDLE)
		deepidle = true;

	ret = mvebu_v7_cpu_suspend(deepidle);
	cpu_pm_exit();

	/*
	 * If we failed to enter the desired state, indicate that we
	 * slept lightly.
	 */
	if (ret)
		return 0;

	return index;
}

static struct cpuidle_driver armadaxp_idle_driver = {
	.name			= "armada_xp_idle",
	.states[0]		= ARM_CPUIDLE_WFI_STATE,
	.states[1]		= {
		.enter			= mvebu_v7_enter_idle,
		.exit_latency		= 100,
		.power_usage		= 50,
		.target_residency	= 1000,
		.name			= "MV CPU IDLE",
		.desc			= "CPU power down",
	},
	.states[2]		= {
		.enter			= mvebu_v7_enter_idle,
		.exit_latency		= 1000,
		.power_usage		= 5,
		.target_residency	= 10000,
		.flags			= MVEBU_V7_FLAG_DEEP_IDLE,
		.name			= "MV CPU DEEP IDLE",
		.desc			= "CPU and L2 Fabric power down",
	},
	.state_count = 3,
};

static struct cpuidle_driver armada370_idle_driver = {
	.name			= "armada_370_idle",
	.states[0]		= ARM_CPUIDLE_WFI_STATE,
	.states[1]		= {
		.enter			= mvebu_v7_enter_idle,
		.exit_latency		= 100,
		.power_usage		= 5,
		.target_residency	= 1000,
		.flags			= MVEBU_V7_FLAG_DEEP_IDLE,
		.name			= "Deep Idle",
		.desc			= "CPU and L2 Fabric power down",
	},
	.state_count = 2,
};

static struct cpuidle_driver armada38x_idle_driver = {
	.name			= "armada_38x_idle",
	.states[0]		= ARM_CPUIDLE_WFI_STATE,
	.states[1]		= {
		.enter			= mvebu_v7_enter_idle,
		.exit_latency		= 10,
		.power_usage		= 5,
		.target_residency	= 100,
		.name			= "Idle",
		.desc			= "CPU and SCU power down",
	},
	.state_count = 2,
};

static int mvebu_v7_cpuidle_probe(struct platform_device *pdev)
{
	const struct platform_device_id *id = pdev->id_entry;

	if (!id)
		return -EINVAL;

	mvebu_v7_cpu_suspend = pdev->dev.platform_data;

	return cpuidle_register((struct cpuidle_driver *)id->driver_data, NULL);
}

static const struct platform_device_id mvebu_cpuidle_ids[] = {
	{
		.name = "cpuidle-armada-xp",
		.driver_data = (unsigned long)&armadaxp_idle_driver,
	}, {
		.name = "cpuidle-armada-370",
		.driver_data = (unsigned long)&armada370_idle_driver,
	}, {
		.name = "cpuidle-armada-38x",
		.driver_data = (unsigned long)&armada38x_idle_driver,
	},
	{}
};

static struct platform_driver mvebu_cpuidle_driver = {
	.probe = mvebu_v7_cpuidle_probe,
	.driver = {
		.name = "cpuidle-mbevu",
		.suppress_bind_attrs = true,
	},
	.id_table = mvebu_cpuidle_ids,
};

builtin_platform_driver(mvebu_cpuidle_driver);

MODULE_AUTHOR("Gregory CLEMENT <gregory.clement@free-electrons.com>");
MODULE_DESCRIPTION("Marvell EBU v7 cpuidle driver");
MODULE_LICENSE("GPL");