1/*
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,
57	},
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");
64