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 
22 static __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 
38 static 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 
53 static int __init s3c64xx_init_cpuidle(void)
54 {
55 	if (soc_is_s3c64xx())
56 		return cpuidle_register(&s3c64xx_cpuidle_driver, NULL);
57 	return 0;
58 }
59 device_initcall(s3c64xx_init_cpuidle);
60