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 <plat/cpu.h>
17 #include <mach/map.h>
18
19 #include "regs-sys.h"
20 #include "regs-syscon-power.h"
21
s3c64xx_enter_idle(struct cpuidle_device * dev,struct cpuidle_driver * drv,int index)22 static int s3c64xx_enter_idle(struct cpuidle_device *dev,
23 struct cpuidle_driver *drv,
24 int index)
25 {
26 unsigned long tmp;
27
28 /* Setup PWRCFG to enter idle mode */
29 tmp = __raw_readl(S3C64XX_PWR_CFG);
30 tmp &= ~S3C64XX_PWRCFG_CFG_WFI_MASK;
31 tmp |= S3C64XX_PWRCFG_CFG_WFI_IDLE;
32 __raw_writel(tmp, S3C64XX_PWR_CFG);
33
34 cpu_do_idle();
35
36 return index;
37 }
38
39 static struct cpuidle_driver s3c64xx_cpuidle_driver = {
40 .name = "s3c64xx_cpuidle",
41 .owner = THIS_MODULE,
42 .states = {
43 {
44 .enter = s3c64xx_enter_idle,
45 .exit_latency = 1,
46 .target_residency = 1,
47 .name = "IDLE",
48 .desc = "System active, ARM gated",
49 },
50 },
51 .state_count = 1,
52 };
53
s3c64xx_init_cpuidle(void)54 static int __init s3c64xx_init_cpuidle(void)
55 {
56 if (soc_is_s3c64xx())
57 return cpuidle_register(&s3c64xx_cpuidle_driver, NULL);
58 return 0;
59 }
60 device_initcall(s3c64xx_init_cpuidle);
61