1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun //
3*4882a593Smuzhiyun // Copyright (c) 2011 Wolfson Microelectronics, plc
4*4882a593Smuzhiyun // Copyright (c) 2011 Samsung Electronics Co., Ltd.
5*4882a593Smuzhiyun // http://www.samsung.com
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun #include <linux/kernel.h>
8*4882a593Smuzhiyun #include <linux/init.h>
9*4882a593Smuzhiyun #include <linux/cpuidle.h>
10*4882a593Smuzhiyun #include <linux/io.h>
11*4882a593Smuzhiyun #include <linux/export.h>
12*4882a593Smuzhiyun #include <linux/time.h>
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun #include <asm/cpuidle.h>
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun #include "cpu.h"
17*4882a593Smuzhiyun #include "map.h"
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun #include "regs-sys-s3c64xx.h"
20*4882a593Smuzhiyun #include "regs-syscon-power-s3c64xx.h"
21*4882a593Smuzhiyun
s3c64xx_enter_idle(struct cpuidle_device * dev,struct cpuidle_driver * drv,int index)22*4882a593Smuzhiyun static int s3c64xx_enter_idle(struct cpuidle_device *dev,
23*4882a593Smuzhiyun struct cpuidle_driver *drv,
24*4882a593Smuzhiyun int index)
25*4882a593Smuzhiyun {
26*4882a593Smuzhiyun unsigned long tmp;
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun /* Setup PWRCFG to enter idle mode */
29*4882a593Smuzhiyun tmp = __raw_readl(S3C64XX_PWR_CFG);
30*4882a593Smuzhiyun tmp &= ~S3C64XX_PWRCFG_CFG_WFI_MASK;
31*4882a593Smuzhiyun tmp |= S3C64XX_PWRCFG_CFG_WFI_IDLE;
32*4882a593Smuzhiyun __raw_writel(tmp, S3C64XX_PWR_CFG);
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun cpu_do_idle();
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun return index;
37*4882a593Smuzhiyun }
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun static struct cpuidle_driver s3c64xx_cpuidle_driver = {
40*4882a593Smuzhiyun .name = "s3c64xx_cpuidle",
41*4882a593Smuzhiyun .owner = THIS_MODULE,
42*4882a593Smuzhiyun .states = {
43*4882a593Smuzhiyun {
44*4882a593Smuzhiyun .enter = s3c64xx_enter_idle,
45*4882a593Smuzhiyun .exit_latency = 1,
46*4882a593Smuzhiyun .target_residency = 1,
47*4882a593Smuzhiyun .name = "IDLE",
48*4882a593Smuzhiyun .desc = "System active, ARM gated",
49*4882a593Smuzhiyun },
50*4882a593Smuzhiyun },
51*4882a593Smuzhiyun .state_count = 1,
52*4882a593Smuzhiyun };
53*4882a593Smuzhiyun
s3c64xx_init_cpuidle(void)54*4882a593Smuzhiyun static int __init s3c64xx_init_cpuidle(void)
55*4882a593Smuzhiyun {
56*4882a593Smuzhiyun if (soc_is_s3c64xx())
57*4882a593Smuzhiyun return cpuidle_register(&s3c64xx_cpuidle_driver, NULL);
58*4882a593Smuzhiyun return 0;
59*4882a593Smuzhiyun }
60*4882a593Smuzhiyun device_initcall(s3c64xx_init_cpuidle);
61