1/* linux/arch/arm/mach-s3c64xx/cpuidle.c
2 *
3 * Copyright (c) 2011 Wolfson Microelectronics, plc
4 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
5 *		http://www.samsung.com
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10*/
11
12#include <linux/kernel.h>
13#include <linux/init.h>
14#include <linux/cpuidle.h>
15#include <linux/io.h>
16#include <linux/export.h>
17#include <linux/time.h>
18
19#include <asm/cpuidle.h>
20
21#include <mach/map.h>
22
23#include "regs-sys.h"
24#include "regs-syscon-power.h"
25
26static int s3c64xx_enter_idle(struct cpuidle_device *dev,
27			      struct cpuidle_driver *drv,
28			      int index)
29{
30	unsigned long tmp;
31
32	/* Setup PWRCFG to enter idle mode */
33	tmp = __raw_readl(S3C64XX_PWR_CFG);
34	tmp &= ~S3C64XX_PWRCFG_CFG_WFI_MASK;
35	tmp |= S3C64XX_PWRCFG_CFG_WFI_IDLE;
36	__raw_writel(tmp, S3C64XX_PWR_CFG);
37
38	cpu_do_idle();
39
40	return index;
41}
42
43static struct cpuidle_driver s3c64xx_cpuidle_driver = {
44	.name	= "s3c64xx_cpuidle",
45	.owner  = THIS_MODULE,
46	.states = {
47		{
48			.enter            = s3c64xx_enter_idle,
49			.exit_latency     = 1,
50			.target_residency = 1,
51			.name             = "IDLE",
52			.desc             = "System active, ARM gated",
53		},
54	},
55	.state_count = 1,
56};
57
58static int __init s3c64xx_init_cpuidle(void)
59{
60	return cpuidle_register(&s3c64xx_cpuidle_driver, NULL);
61}
62device_initcall(s3c64xx_init_cpuidle);
63