1/*
2 * Marvell Armada 370, 38x and XP SoC cpuidle driver
3 *
4 * Copyright (C) 2014 Marvell
5 *
6 * Nadav Haklai <nadavh@marvell.com>
7 * Gregory CLEMENT <gregory.clement@free-electrons.com>
8 *
9 * This file is licensed under the terms of the GNU General Public
10 * License version 2.  This program is licensed "as is" without any
11 * warranty of any kind, whether express or implied.
12 *
13 * Maintainer: Gregory CLEMENT <gregory.clement@free-electrons.com>
14 */
15
16#include <linux/cpu_pm.h>
17#include <linux/cpuidle.h>
18#include <linux/module.h>
19#include <linux/of.h>
20#include <linux/suspend.h>
21#include <linux/platform_device.h>
22#include <asm/cpuidle.h>
23
24#define MVEBU_V7_FLAG_DEEP_IDLE	0x10000
25
26static int (*mvebu_v7_cpu_suspend)(int);
27
28static int mvebu_v7_enter_idle(struct cpuidle_device *dev,
29				struct cpuidle_driver *drv,
30				int index)
31{
32	int ret;
33	bool deepidle = false;
34	cpu_pm_enter();
35
36	if (drv->states[index].flags & MVEBU_V7_FLAG_DEEP_IDLE)
37		deepidle = true;
38
39	ret = mvebu_v7_cpu_suspend(deepidle);
40	cpu_pm_exit();
41
42	if (ret)
43		return ret;
44
45	return index;
46}
47
48static struct cpuidle_driver armadaxp_idle_driver = {
49	.name			= "armada_xp_idle",
50	.states[0]		= ARM_CPUIDLE_WFI_STATE,
51	.states[1]		= {
52		.enter			= mvebu_v7_enter_idle,
53		.exit_latency		= 100,
54		.power_usage		= 50,
55		.target_residency	= 1000,
56		.name			= "MV CPU IDLE",
57		.desc			= "CPU power down",
58	},
59	.states[2]		= {
60		.enter			= mvebu_v7_enter_idle,
61		.exit_latency		= 1000,
62		.power_usage		= 5,
63		.target_residency	= 10000,
64		.flags			= MVEBU_V7_FLAG_DEEP_IDLE,
65		.name			= "MV CPU DEEP IDLE",
66		.desc			= "CPU and L2 Fabric power down",
67	},
68	.state_count = 3,
69};
70
71static struct cpuidle_driver armada370_idle_driver = {
72	.name			= "armada_370_idle",
73	.states[0]		= ARM_CPUIDLE_WFI_STATE,
74	.states[1]		= {
75		.enter			= mvebu_v7_enter_idle,
76		.exit_latency		= 100,
77		.power_usage		= 5,
78		.target_residency	= 1000,
79		.flags			= MVEBU_V7_FLAG_DEEP_IDLE,
80		.name			= "Deep Idle",
81		.desc			= "CPU and L2 Fabric power down",
82	},
83	.state_count = 2,
84};
85
86static struct cpuidle_driver armada38x_idle_driver = {
87	.name			= "armada_38x_idle",
88	.states[0]		= ARM_CPUIDLE_WFI_STATE,
89	.states[1]		= {
90		.enter			= mvebu_v7_enter_idle,
91		.exit_latency		= 10,
92		.power_usage		= 5,
93		.target_residency	= 100,
94		.name			= "Idle",
95		.desc			= "CPU and SCU power down",
96	},
97	.state_count = 2,
98};
99
100static int mvebu_v7_cpuidle_probe(struct platform_device *pdev)
101{
102	const struct platform_device_id *id = pdev->id_entry;
103
104	if (!id)
105		return -EINVAL;
106
107	mvebu_v7_cpu_suspend = pdev->dev.platform_data;
108
109	return cpuidle_register((struct cpuidle_driver *)id->driver_data, NULL);
110}
111
112static const struct platform_device_id mvebu_cpuidle_ids[] = {
113	{
114		.name = "cpuidle-armada-xp",
115		.driver_data = (unsigned long)&armadaxp_idle_driver,
116	}, {
117		.name = "cpuidle-armada-370",
118		.driver_data = (unsigned long)&armada370_idle_driver,
119	}, {
120		.name = "cpuidle-armada-38x",
121		.driver_data = (unsigned long)&armada38x_idle_driver,
122	},
123	{}
124};
125
126static struct platform_driver mvebu_cpuidle_driver = {
127	.probe = mvebu_v7_cpuidle_probe,
128	.driver = {
129		.name = "cpuidle-mbevu",
130		.suppress_bind_attrs = true,
131	},
132	.id_table = mvebu_cpuidle_ids,
133};
134
135builtin_platform_driver(mvebu_cpuidle_driver);
136
137MODULE_AUTHOR("Gregory CLEMENT <gregory.clement@free-electrons.com>");
138MODULE_DESCRIPTION("Marvell EBU v7 cpuidle driver");
139MODULE_LICENSE("GPL");
140