Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2019 Paul Cercueil <paul@crapouillou.net>
4 */
5
6#include "cgu.h"
7#include "pm.h"
8
9#include <linux/io.h>
10#include <linux/syscore_ops.h>
11
12#define CGU_REG_LCR 0x04
13
14#define LCR_LOW_POWER_MODE BIT(0)
15
16static void __iomem * __maybe_unused ingenic_cgu_base;
17
18static int __maybe_unused ingenic_cgu_pm_suspend(void *data)
19{
20 u32 val = readl(ingenic_cgu_base + CGU_REG_LCR);
21
22 writel(val | LCR_LOW_POWER_MODE, ingenic_cgu_base + CGU_REG_LCR);
23
24 return 0;
25}
26
27static void __maybe_unused ingenic_cgu_pm_resume(void *data)
28{
29 u32 val = readl(ingenic_cgu_base + CGU_REG_LCR);
30
31 writel(val & ~LCR_LOW_POWER_MODE, ingenic_cgu_base + CGU_REG_LCR);
32}
33
34static const struct syscore_ops __maybe_unused ingenic_cgu_pm_ops = {
35 .suspend = ingenic_cgu_pm_suspend,
36 .resume = ingenic_cgu_pm_resume,
37};
38
39static struct syscore __maybe_unused ingenic_cgu_pm = {
40 .ops = &ingenic_cgu_pm_ops,
41};
42
43void ingenic_cgu_register_syscore(struct ingenic_cgu *cgu)
44{
45 if (IS_ENABLED(CONFIG_PM_SLEEP)) {
46 ingenic_cgu_base = cgu->base;
47 register_syscore(&ingenic_cgu_pm);
48 }
49}