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/interrupt.h>
10#include <linux/pm.h>
11
12#include <asm/i8259.h>
13#include <asm/mipsregs.h>
14
15#include <loongson.h>
16
17static unsigned int __maybe_unused cached_master_mask; /* i8259A */
18static unsigned int __maybe_unused cached_slave_mask;
19static unsigned int __maybe_unused cached_bonito_irq_mask; /* bonito */
20
21void arch_suspend_disable_irqs(void)
22{
23 /* disable all mips events */
24 local_irq_disable();
25
26#ifdef CONFIG_I8259
27 /* disable all events of i8259A */
28 cached_slave_mask = inb(PIC_SLAVE_IMR);
29 cached_master_mask = inb(PIC_MASTER_IMR);
30
31 outb(0xff, PIC_SLAVE_IMR);
32 inb(PIC_SLAVE_IMR);
33 outb(0xff, PIC_MASTER_IMR);
34 inb(PIC_MASTER_IMR);
35#endif
36 /* disable all events of bonito */
37 cached_bonito_irq_mask = LOONGSON_INTEN;
38 LOONGSON_INTENCLR = 0xffff;
39 (void)LOONGSON_INTENCLR;
40}
41
42void arch_suspend_enable_irqs(void)
43{
44 /* enable all mips events */
45 local_irq_enable();
46#ifdef CONFIG_I8259
47 /* only enable the cached events of i8259A */
48 outb(cached_slave_mask, PIC_SLAVE_IMR);
49 outb(cached_master_mask, PIC_MASTER_IMR);
50#endif
51 /* enable all cached events of bonito */
52 LOONGSON_INTENSET = cached_bonito_irq_mask;
53 (void)LOONGSON_INTENSET;
54}
55
56/*
57 * Setup the board-specific events for waking up loongson from wait mode
58 */
59void __weak setup_wakeup_events(void)
60{
61}
62
63void __weak mach_suspend(void)
64{
65}
66
67void __weak mach_resume(void)
68{
69}
70
71static int loongson_pm_enter(suspend_state_t state)
72{
73 mach_suspend();
74
75 mach_resume();
76
77 return 0;
78}
79
80static int loongson_pm_valid_state(suspend_state_t state)
81{
82 switch (state) {
83 case PM_SUSPEND_ON:
84 case PM_SUSPEND_STANDBY:
85 case PM_SUSPEND_MEM:
86 return 1;
87
88 default:
89 return 0;
90 }
91}
92
93static const struct platform_suspend_ops loongson_pm_ops = {
94 .valid = loongson_pm_valid_state,
95 .enter = loongson_pm_enter,
96};
97
98static int __init loongson_pm_init(void)
99{
100 suspend_set_ops(ops: &loongson_pm_ops);
101
102 return 0;
103}
104arch_initcall(loongson_pm_init);
105

source code of linux/arch/mips/loongson64/pm.c