blob: 18a7f738050816924a924499e41f78b3b59d6074 [file] [log] [blame]
Alexander Shiyan7c7f8f72014-03-22 09:44:35 +04001/*
2 * CLPS711X CPU idle driver
3 *
4 * Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 */
11
12#include <linux/cpuidle.h>
13#include <linux/err.h>
14#include <linux/io.h>
15#include <linux/module.h>
16#include <linux/platform_device.h>
17
18#define CLPS711X_CPUIDLE_NAME "clps711x-cpuidle"
19
20static void __iomem *clps711x_halt;
21
22static int clps711x_cpuidle_halt(struct cpuidle_device *dev,
23 struct cpuidle_driver *drv, int index)
24{
25 writel(0xaa, clps711x_halt);
26
27 return index;
28}
29
30static struct cpuidle_driver clps711x_idle_driver = {
31 .name = CLPS711X_CPUIDLE_NAME,
32 .owner = THIS_MODULE,
33 .states[0] = {
34 .name = "HALT",
35 .desc = "CLPS711X HALT",
36 .enter = clps711x_cpuidle_halt,
37 .exit_latency = 1,
38 },
39 .state_count = 1,
40};
41
42static int __init clps711x_cpuidle_probe(struct platform_device *pdev)
43{
44 struct resource *res;
45
46 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
47 clps711x_halt = devm_ioremap_resource(&pdev->dev, res);
48 if (IS_ERR(clps711x_halt))
49 return PTR_ERR(clps711x_halt);
50
51 return cpuidle_register(&clps711x_idle_driver, NULL);
52}
53
54static struct platform_driver clps711x_cpuidle_driver = {
55 .driver = {
56 .name = CLPS711X_CPUIDLE_NAME,
Alexander Shiyan7c7f8f72014-03-22 09:44:35 +040057 },
58};
59module_platform_driver_probe(clps711x_cpuidle_driver, clps711x_cpuidle_probe);
60
61MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
62MODULE_DESCRIPTION("CLPS711X CPU idle driver");
63MODULE_LICENSE("GPL");