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
26 static int (*mvebu_v7_cpu_suspend)(int);
27
mvebu_v7_enter_idle(struct cpuidle_device * dev,struct cpuidle_driver * drv,int index)28 static __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
51 static 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
75 static 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
90 static 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
mvebu_v7_cpuidle_probe(struct platform_device * pdev)105 static 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
117 static 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
131 static 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
140 builtin_platform_driver(mvebu_cpuidle_driver);
141
142 MODULE_AUTHOR("Gregory CLEMENT <gregory.clement@free-electrons.com>");
143 MODULE_DESCRIPTION("Marvell EBU v7 cpuidle driver");
144 MODULE_LICENSE("GPL");
145