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/proc-fns.h>
20
21 #include <mach/map.h>
22
23 #include "regs-sys.h"
24 #include "regs-syscon-power.h"
25
s3c64xx_enter_idle(struct cpuidle_device * dev,struct cpuidle_driver * drv,int index)26 static 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
43 static 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 .flags = CPUIDLE_FLAG_TIME_VALID,
52 .name = "IDLE",
53 .desc = "System active, ARM gated",
54 },
55 },
56 .state_count = 1,
57 };
58
s3c64xx_init_cpuidle(void)59 static int __init s3c64xx_init_cpuidle(void)
60 {
61 return cpuidle_register(&s3c64xx_cpuidle_driver, NULL);
62 }
63 device_initcall(s3c64xx_init_cpuidle);
64