1// SPDX-License-Identifier: GPL-2.0
 2//
 3// Copyright (c) 2010 Samsung Electronics Co., Ltd.
 4//		http://www.samsung.com
 5//
 6// S3C2416 - PM support (Based on Ben Dooks' S3C2412 PM support)
 7
 8#include <linux/device.h>
 9#include <linux/syscore_ops.h>
10#include <linux/io.h>
11
12#include <asm/cacheflush.h>
13
14#include "regs-s3c2443-clock.h"
15
16#include "cpu.h"
17#include "pm.h"
18
19#include "s3c2412-power.h"
20
21#ifdef CONFIG_PM_SLEEP
22extern void s3c2412_sleep_enter(void);
23
24static int s3c2416_cpu_suspend(unsigned long arg)
25{
26	/* enable wakeup sources regardless of battery state */
27	__raw_writel(S3C2443_PWRCFG_SLEEP, S3C2443_PWRCFG);
28
29	/* set the mode as sleep, 2BED represents "Go to BED" */
30	__raw_writel(0x2BED, S3C2443_PWRMODE);
31
32	s3c2412_sleep_enter();
33
34	pr_info("Failed to suspend the system\n");
35	return 1; /* Aborting suspend */
36}
37
38static void s3c2416_pm_prepare(void)
39{
40	/*
41	 * write the magic value u-boot uses to check for resume into
42	 * the INFORM0 register, and ensure INFORM1 is set to the
43	 * correct address to resume from.
44	 */
45	__raw_writel(0x2BED, S3C2412_INFORM0);
46	__raw_writel(__pa_symbol(s3c_cpu_resume), S3C2412_INFORM1);
47}
48
49static int s3c2416_pm_add(struct device *dev, struct subsys_interface *sif)
50{
51	pm_cpu_prep = s3c2416_pm_prepare;
52	pm_cpu_sleep = s3c2416_cpu_suspend;
53
54	return 0;
55}
56
57static struct subsys_interface s3c2416_pm_interface = {
58	.name		= "s3c2416_pm",
59	.subsys		= &s3c2416_subsys,
60	.add_dev	= s3c2416_pm_add,
61};
62
63static __init int s3c2416_pm_init(void)
64{
65	return subsys_interface_register(&s3c2416_pm_interface);
66}
67
68arch_initcall(s3c2416_pm_init);
69#endif
70
71static void s3c2416_pm_resume(void)
72{
73	/* unset the return-from-sleep amd inform flags */
74	__raw_writel(0x0, S3C2443_PWRMODE);
75	__raw_writel(0x0, S3C2412_INFORM0);
76	__raw_writel(0x0, S3C2412_INFORM1);
77}
78
79struct syscore_ops s3c2416_pm_syscore_ops = {
80	.resume		= s3c2416_pm_resume,
81};