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	if (ret)
41		return ret;
42
43	cpu_pm_exit();
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		= 10,
54		.power_usage		= 50,
55		.target_residency	= 100,
56		.flags			= CPUIDLE_FLAG_TIME_VALID,
57		.name			= "MV CPU IDLE",
58		.desc			= "CPU power down",
59	},
60	.states[2]		= {
61		.enter			= mvebu_v7_enter_idle,
62		.exit_latency		= 100,
63		.power_usage		= 5,
64		.target_residency	= 1000,
65		.flags			= CPUIDLE_FLAG_TIME_VALID |
66						MVEBU_V7_FLAG_DEEP_IDLE,
67		.name			= "MV CPU DEEP IDLE",
68		.desc			= "CPU and L2 Fabric power down",
69	},
70	.state_count = 3,
71};
72
73static struct cpuidle_driver armada370_idle_driver = {
74	.name			= "armada_370_idle",
75	.states[0]		= ARM_CPUIDLE_WFI_STATE,
76	.states[1]		= {
77		.enter			= mvebu_v7_enter_idle,
78		.exit_latency		= 100,
79		.power_usage		= 5,
80		.target_residency	= 1000,
81		.flags			= (CPUIDLE_FLAG_TIME_VALID |
82					   MVEBU_V7_FLAG_DEEP_IDLE),
83		.name			= "Deep Idle",
84		.desc			= "CPU and L2 Fabric power down",
85	},
86	.state_count = 2,
87};
88
89static struct cpuidle_driver armada38x_idle_driver = {
90	.name			= "armada_38x_idle",
91	.states[0]		= ARM_CPUIDLE_WFI_STATE,
92	.states[1]		= {
93		.enter			= mvebu_v7_enter_idle,
94		.exit_latency		= 10,
95		.power_usage		= 5,
96		.target_residency	= 100,
97		.flags			= CPUIDLE_FLAG_TIME_VALID,
98		.name			= "Idle",
99		.desc			= "CPU and SCU power down",
100	},
101	.state_count = 2,
102};
103
104static int mvebu_v7_cpuidle_probe(struct platform_device *pdev)
105{
106	mvebu_v7_cpu_suspend = pdev->dev.platform_data;
107
108	if (!strcmp(pdev->dev.driver->name, "cpuidle-armada-xp"))
109		return cpuidle_register(&armadaxp_idle_driver, NULL);
110	else if (!strcmp(pdev->dev.driver->name, "cpuidle-armada-370"))
111		return cpuidle_register(&armada370_idle_driver, NULL);
112	else if (!strcmp(pdev->dev.driver->name, "cpuidle-armada-38x"))
113		return cpuidle_register(&armada38x_idle_driver, NULL);
114	else
115		return -EINVAL;
116}
117
118static struct platform_driver armadaxp_cpuidle_plat_driver = {
119	.driver = {
120		.name = "cpuidle-armada-xp",
121		.owner = THIS_MODULE,
122	},
123	.probe = mvebu_v7_cpuidle_probe,
124};
125
126module_platform_driver(armadaxp_cpuidle_plat_driver);
127
128static struct platform_driver armada370_cpuidle_plat_driver = {
129	.driver = {
130		.name = "cpuidle-armada-370",
131		.owner = THIS_MODULE,
132	},
133	.probe = mvebu_v7_cpuidle_probe,
134};
135
136module_platform_driver(armada370_cpuidle_plat_driver);
137
138static struct platform_driver armada38x_cpuidle_plat_driver = {
139	.driver = {
140		.name = "cpuidle-armada-38x",
141		.owner = THIS_MODULE,
142	},
143	.probe = mvebu_v7_cpuidle_probe,
144};
145
146module_platform_driver(armada38x_cpuidle_plat_driver);
147
148MODULE_AUTHOR("Gregory CLEMENT <gregory.clement@free-electrons.com>");
149MODULE_DESCRIPTION("Marvell EBU v7 cpuidle driver");
150MODULE_LICENSE("GPL");
151