1// SPDX-License-Identifier: GPL-2.0
2//
3// Copyright (c) 2011 Wolfson Microelectronics, plc
4// Copyright (c) 2011 Samsung Electronics Co., Ltd.
5//		http://www.samsung.com
6
7#include <linux/kernel.h>
8#include <linux/init.h>
9#include <linux/cpuidle.h>
10#include <linux/io.h>
11#include <linux/export.h>
12#include <linux/time.h>
13
14#include <asm/cpuidle.h>
15
16#include "cpu.h"
17#include "map.h"
18
19#include "regs-sys-s3c64xx.h"
20#include "regs-syscon-power-s3c64xx.h"
21
22static __cpuidle int s3c64xx_enter_idle(struct cpuidle_device *dev,
23					struct cpuidle_driver *drv, int index)
24{
25	unsigned long tmp;
26
27	/* Setup PWRCFG to enter idle mode */
28	tmp = __raw_readl(S3C64XX_PWR_CFG);
29	tmp &= ~S3C64XX_PWRCFG_CFG_WFI_MASK;
30	tmp |= S3C64XX_PWRCFG_CFG_WFI_IDLE;
31	__raw_writel(tmp, S3C64XX_PWR_CFG);
32
33	cpu_do_idle();
34
35	return index;
36}
37
38static struct cpuidle_driver s3c64xx_cpuidle_driver = {
39	.name	= "s3c64xx_cpuidle",
40	.owner  = THIS_MODULE,
41	.states = {
42		{
43			.enter            = s3c64xx_enter_idle,
44			.exit_latency     = 1,
45			.target_residency = 1,
46			.name             = "IDLE",
47			.desc             = "System active, ARM gated",
48		},
49	},
50	.state_count = 1,
51};
52
53static int __init s3c64xx_init_cpuidle(void)
54{
55	if (soc_is_s3c64xx())
56		return cpuidle_register(&s3c64xx_cpuidle_driver, NULL);
57	return 0;
58}
59device_initcall(s3c64xx_init_cpuidle);
60