pm.c

 1// SPDX-License-Identifier: GPL-2.0-or-later
 2/*
 3 * loongson-specific suspend support
 4 *
 5 *  Copyright (C) 2009 Lemote Inc.
 6 *  Author: Wu Zhangjin <wuzhangjin@gmail.com>
 7 */
 8#include <linux/suspend.h>
 9#include <linux/pm.h>
10
11#include <asm/mipsregs.h>
12
13#include <loongson.h>
14
15asmlinkage void loongson_lefi_sleep(unsigned long sleep_addr);
16
17static int lefi_pm_enter(suspend_state_t state)
18{
19	switch (state) {
20	case PM_SUSPEND_MEM:
21		pm_set_suspend_via_firmware();
22		loongson_lefi_sleep(loongson_sysconf.suspend_addr);
23		pm_set_resume_via_firmware();
24		return 0;
25	default:
26		return -EINVAL;
27	}
28}
29
30static int lefi_pm_valid_state(suspend_state_t state)
31{
32	switch (state) {
33	case PM_SUSPEND_MEM:
34		return !!loongson_sysconf.suspend_addr;
35	default:
36		return 0;
37	}
38}
39
40static const struct platform_suspend_ops lefi_pm_ops = {
41	.valid	= lefi_pm_valid_state,
42	.enter	= lefi_pm_enter,
43};
44
45static int __init loongson_pm_init(void)
46{
47	if (loongson_sysconf.fw_interface == LOONGSON_LEFI)
48		suspend_set_ops(&lefi_pm_ops);
49
50	return 0;
51}
52arch_initcall(loongson_pm_init);