Merge tag 'drm-misc-fixes-2018-02-21' of git://anongit.freedesktop.org/drm/drm-misc...
[sfrench/cifs-2.6.git] / arch / arm / mach-s3c24xx / pm-s3c2416.c
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 <mach/regs-s3c2443-clock.h>
15
16 #include <plat/cpu.h>
17 #include <plat/pm.h>
18
19 #include "s3c2412-power.h"
20
21 #ifdef CONFIG_PM_SLEEP
22 extern void s3c2412_sleep_enter(void);
23
24 static 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
38 static 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
49 static 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
57 static struct subsys_interface s3c2416_pm_interface = {
58         .name           = "s3c2416_pm",
59         .subsys         = &s3c2416_subsys,
60         .add_dev        = s3c2416_pm_add,
61 };
62
63 static __init int s3c2416_pm_init(void)
64 {
65         return subsys_interface_register(&s3c2416_pm_interface);
66 }
67
68 arch_initcall(s3c2416_pm_init);
69 #endif
70
71 static 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
79 struct syscore_ops s3c2416_pm_syscore_ops = {
80         .resume         = s3c2416_pm_resume,
81 };