blob: 28587d0f3947dfd715f1c7c24d374c0cc35559cf [file] [log] [blame]
Gregory CLEMENTb858fbc2014-04-14 17:10:13 +02001/*
2 * Marvell Armada 370 and Armada 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 ARMADA_370_XP_MAX_STATES 3
25#define ARMADA_370_XP_FLAG_DEEP_IDLE 0x10000
26
27static int (*armada_370_xp_cpu_suspend)(int);
28
29static int armada_370_xp_enter_idle(struct cpuidle_device *dev,
30 struct cpuidle_driver *drv,
31 int index)
32{
33 int ret;
34 bool deepidle = false;
35 cpu_pm_enter();
36
37 if (drv->states[index].flags & ARMADA_370_XP_FLAG_DEEP_IDLE)
38 deepidle = true;
39
40 ret = armada_370_xp_cpu_suspend(deepidle);
41 if (ret)
42 return ret;
43
44 cpu_pm_exit();
45
46 return index;
47}
48
49static struct cpuidle_driver armada_370_xp_idle_driver = {
50 .name = "armada_370_xp_idle",
51 .states[0] = ARM_CPUIDLE_WFI_STATE,
52 .states[1] = {
53 .enter = armada_370_xp_enter_idle,
54 .exit_latency = 10,
55 .power_usage = 50,
56 .target_residency = 100,
57 .flags = CPUIDLE_FLAG_TIME_VALID,
58 .name = "MV CPU IDLE",
59 .desc = "CPU power down",
60 },
61 .states[2] = {
62 .enter = armada_370_xp_enter_idle,
63 .exit_latency = 100,
64 .power_usage = 5,
65 .target_residency = 1000,
66 .flags = CPUIDLE_FLAG_TIME_VALID |
67 ARMADA_370_XP_FLAG_DEEP_IDLE,
68 .name = "MV CPU DEEP IDLE",
69 .desc = "CPU and L2 Fabric power down",
70 },
71 .state_count = ARMADA_370_XP_MAX_STATES,
72};
73
74static int armada_370_xp_cpuidle_probe(struct platform_device *pdev)
75{
76
77 armada_370_xp_cpu_suspend = (void *)(pdev->dev.platform_data);
78 return cpuidle_register(&armada_370_xp_idle_driver, NULL);
79}
80
81static struct platform_driver armada_370_xp_cpuidle_plat_driver = {
82 .driver = {
83 .name = "cpuidle-armada-370-xp",
84 .owner = THIS_MODULE,
85 },
86 .probe = armada_370_xp_cpuidle_probe,
87};
88
89module_platform_driver(armada_370_xp_cpuidle_plat_driver);
90
91MODULE_AUTHOR("Gregory CLEMENT <gregory.clement@free-electrons.com>");
92MODULE_DESCRIPTION("Armada 370/XP cpu idle driver");
93MODULE_LICENSE("GPL");