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 
17 static unsigned int __maybe_unused cached_master_mask;	/* i8259A */
18 static unsigned int __maybe_unused cached_slave_mask;
19 static unsigned int __maybe_unused cached_bonito_irq_mask; /* bonito */
20 
arch_suspend_disable_irqs(void)21 void 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 
arch_suspend_enable_irqs(void)42 void 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  */
setup_wakeup_events(void)59 void __weak setup_wakeup_events(void)
60 {
61 }
62 
mach_suspend(void)63 void __weak mach_suspend(void)
64 {
65 }
66 
mach_resume(void)67 void __weak mach_resume(void)
68 {
69 }
70 
loongson_pm_enter(suspend_state_t state)71 static int loongson_pm_enter(suspend_state_t state)
72 {
73 	mach_suspend();
74 
75 	mach_resume();
76 
77 	return 0;
78 }
79 
loongson_pm_valid_state(suspend_state_t state)80 static 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 
93 static const struct platform_suspend_ops loongson_pm_ops = {
94 	.valid	= loongson_pm_valid_state,
95 	.enter	= loongson_pm_enter,
96 };
97 
loongson_pm_init(void)98 static int __init loongson_pm_init(void)
99 {
100 	suspend_set_ops(&loongson_pm_ops);
101 
102 	return 0;
103 }
104 arch_initcall(loongson_pm_init);
105