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 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
48 static 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
71 static 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
86 static 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
mvebu_v7_cpuidle_probe(struct platform_device * pdev)100 static 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
112 static 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
126 static 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
135 builtin_platform_driver(mvebu_cpuidle_driver);
136
137 MODULE_AUTHOR("Gregory CLEMENT <gregory.clement@free-electrons.com>");
138 MODULE_DESCRIPTION("Marvell EBU v7 cpuidle driver");
139 MODULE_LICENSE("GPL");
140