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 __cpuidle 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	ct_cpuidle_enter();
40	ret = mvebu_v7_cpu_suspend(deepidle);
41	ct_cpuidle_exit();
42
43	cpu_pm_exit();
44
45	if (ret)
46		return ret;
47
48	return index;
49}
50
51static struct cpuidle_driver armadaxp_idle_driver = {
52	.name			= "armada_xp_idle",
53	.states[0]		= ARM_CPUIDLE_WFI_STATE,
54	.states[1]		= {
55		.enter			= mvebu_v7_enter_idle,
56		.exit_latency		= 100,
57		.power_usage		= 50,
58		.target_residency	= 1000,
59		.flags			= CPUIDLE_FLAG_RCU_IDLE,
60		.name			= "MV CPU IDLE",
61		.desc			= "CPU power down",
62	},
63	.states[2]		= {
64		.enter			= mvebu_v7_enter_idle,
65		.exit_latency		= 1000,
66		.power_usage		= 5,
67		.target_residency	= 10000,
68		.flags			= MVEBU_V7_FLAG_DEEP_IDLE | CPUIDLE_FLAG_RCU_IDLE,
69		.name			= "MV CPU DEEP IDLE",
70		.desc			= "CPU and L2 Fabric power down",
71	},
72	.state_count = 3,
73};
74
75static struct cpuidle_driver armada370_idle_driver = {
76	.name			= "armada_370_idle",
77	.states[0]		= ARM_CPUIDLE_WFI_STATE,
78	.states[1]		= {
79		.enter			= mvebu_v7_enter_idle,
80		.exit_latency		= 100,
81		.power_usage		= 5,
82		.target_residency	= 1000,
83		.flags			= MVEBU_V7_FLAG_DEEP_IDLE | CPUIDLE_FLAG_RCU_IDLE,
84		.name			= "Deep Idle",
85		.desc			= "CPU and L2 Fabric power down",
86	},
87	.state_count = 2,
88};
89
90static struct cpuidle_driver armada38x_idle_driver = {
91	.name			= "armada_38x_idle",
92	.states[0]		= ARM_CPUIDLE_WFI_STATE,
93	.states[1]		= {
94		.enter			= mvebu_v7_enter_idle,
95		.exit_latency		= 10,
96		.power_usage		= 5,
97		.target_residency	= 100,
98		.flags			= CPUIDLE_FLAG_RCU_IDLE,
99		.name			= "Idle",
100		.desc			= "CPU and SCU power down",
101	},
102	.state_count = 2,
103};
104
105static int mvebu_v7_cpuidle_probe(struct platform_device *pdev)
106{
107	const struct platform_device_id *id = pdev->id_entry;
108
109	if (!id)
110		return -EINVAL;
111
112	mvebu_v7_cpu_suspend = pdev->dev.platform_data;
113
114	return cpuidle_register((struct cpuidle_driver *)id->driver_data, NULL);
115}
116
117static const struct platform_device_id mvebu_cpuidle_ids[] = {
118	{
119		.name = "cpuidle-armada-xp",
120		.driver_data = (unsigned long)&armadaxp_idle_driver,
121	}, {
122		.name = "cpuidle-armada-370",
123		.driver_data = (unsigned long)&armada370_idle_driver,
124	}, {
125		.name = "cpuidle-armada-38x",
126		.driver_data = (unsigned long)&armada38x_idle_driver,
127	},
128	{}
129};
130
131static struct platform_driver mvebu_cpuidle_driver = {
132	.probe = mvebu_v7_cpuidle_probe,
133	.driver = {
134		.name = "cpuidle-mbevu",
135		.suppress_bind_attrs = true,
136	},
137	.id_table = mvebu_cpuidle_ids,
138};
139
140builtin_platform_driver(mvebu_cpuidle_driver);
141
142MODULE_AUTHOR("Gregory CLEMENT <gregory.clement@free-electrons.com>");
143MODULE_DESCRIPTION("Marvell EBU v7 cpuidle driver");
144MODULE_LICENSE("GPL");
145