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
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