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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
f181bf60 WZ |
2 | /* |
3 | * loongson-specific suspend support | |
4 | * | |
5 | * Copyright (C) 2009 Lemote Inc. | |
f7a904df | 6 | * Author: Wu Zhangjin <wuzhangjin@gmail.com> |
f181bf60 WZ |
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 | ||
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 | ||
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 | */ | |
59 | void __weak setup_wakeup_events(void) | |
60 | { | |
61 | } | |
62 | ||
f181bf60 WZ |
63 | void __weak mach_suspend(void) |
64 | { | |
65 | } | |
66 | ||
67 | void __weak mach_resume(void) | |
68 | { | |
69 | } | |
70 | ||
71 | static int loongson_pm_enter(suspend_state_t state) | |
72 | { | |
73 | mach_suspend(); | |
74 | ||
f181bf60 WZ |
75 | mach_resume(); |
76 | ||
77 | return 0; | |
78 | } | |
79 | ||
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 | ||
2f55ac07 | 93 | static const struct platform_suspend_ops loongson_pm_ops = { |
f181bf60 WZ |
94 | .valid = loongson_pm_valid_state, |
95 | .enter = loongson_pm_enter, | |
96 | }; | |
97 | ||
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); |