xref: /OK3568_Linux_fs/kernel/arch/mips/loongson64/pm.c (revision 4882a59341e53eb6f0b4789bf948001014eff981) 
1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun  * loongson-specific suspend support
4*4882a593Smuzhiyun  *
5*4882a593Smuzhiyun  *  Copyright (C) 2009 Lemote Inc.
6*4882a593Smuzhiyun  *  Author: Wu Zhangjin <wuzhangjin@gmail.com>
7*4882a593Smuzhiyun  */
8*4882a593Smuzhiyun #include <linux/suspend.h>
9*4882a593Smuzhiyun #include <linux/interrupt.h>
10*4882a593Smuzhiyun #include <linux/pm.h>
11*4882a593Smuzhiyun 
12*4882a593Smuzhiyun #include <asm/i8259.h>
13*4882a593Smuzhiyun #include <asm/mipsregs.h>
14*4882a593Smuzhiyun 
15*4882a593Smuzhiyun #include <loongson.h>
16*4882a593Smuzhiyun 
17*4882a593Smuzhiyun static unsigned int __maybe_unused cached_master_mask;	/* i8259A */
18*4882a593Smuzhiyun static unsigned int __maybe_unused cached_slave_mask;
19*4882a593Smuzhiyun static unsigned int __maybe_unused cached_bonito_irq_mask; /* bonito */
20*4882a593Smuzhiyun 
arch_suspend_disable_irqs(void)21*4882a593Smuzhiyun void arch_suspend_disable_irqs(void)
22*4882a593Smuzhiyun {
23*4882a593Smuzhiyun 	/* disable all mips events */
24*4882a593Smuzhiyun 	local_irq_disable();
25*4882a593Smuzhiyun 
26*4882a593Smuzhiyun #ifdef CONFIG_I8259
27*4882a593Smuzhiyun 	/* disable all events of i8259A */
28*4882a593Smuzhiyun 	cached_slave_mask = inb(PIC_SLAVE_IMR);
29*4882a593Smuzhiyun 	cached_master_mask = inb(PIC_MASTER_IMR);
30*4882a593Smuzhiyun 
31*4882a593Smuzhiyun 	outb(0xff, PIC_SLAVE_IMR);
32*4882a593Smuzhiyun 	inb(PIC_SLAVE_IMR);
33*4882a593Smuzhiyun 	outb(0xff, PIC_MASTER_IMR);
34*4882a593Smuzhiyun 	inb(PIC_MASTER_IMR);
35*4882a593Smuzhiyun #endif
36*4882a593Smuzhiyun 	/* disable all events of bonito */
37*4882a593Smuzhiyun 	cached_bonito_irq_mask = LOONGSON_INTEN;
38*4882a593Smuzhiyun 	LOONGSON_INTENCLR = 0xffff;
39*4882a593Smuzhiyun 	(void)LOONGSON_INTENCLR;
40*4882a593Smuzhiyun }
41*4882a593Smuzhiyun 
arch_suspend_enable_irqs(void)42*4882a593Smuzhiyun void arch_suspend_enable_irqs(void)
43*4882a593Smuzhiyun {
44*4882a593Smuzhiyun 	/* enable all mips events */
45*4882a593Smuzhiyun 	local_irq_enable();
46*4882a593Smuzhiyun #ifdef CONFIG_I8259
47*4882a593Smuzhiyun 	/* only enable the cached events of i8259A */
48*4882a593Smuzhiyun 	outb(cached_slave_mask, PIC_SLAVE_IMR);
49*4882a593Smuzhiyun 	outb(cached_master_mask, PIC_MASTER_IMR);
50*4882a593Smuzhiyun #endif
51*4882a593Smuzhiyun 	/* enable all cached events of bonito */
52*4882a593Smuzhiyun 	LOONGSON_INTENSET = cached_bonito_irq_mask;
53*4882a593Smuzhiyun 	(void)LOONGSON_INTENSET;
54*4882a593Smuzhiyun }
55*4882a593Smuzhiyun 
56*4882a593Smuzhiyun /*
57*4882a593Smuzhiyun  * Setup the board-specific events for waking up loongson from wait mode
58*4882a593Smuzhiyun  */
setup_wakeup_events(void)59*4882a593Smuzhiyun void __weak setup_wakeup_events(void)
60*4882a593Smuzhiyun {
61*4882a593Smuzhiyun }
62*4882a593Smuzhiyun 
mach_suspend(void)63*4882a593Smuzhiyun void __weak mach_suspend(void)
64*4882a593Smuzhiyun {
65*4882a593Smuzhiyun }
66*4882a593Smuzhiyun 
mach_resume(void)67*4882a593Smuzhiyun void __weak mach_resume(void)
68*4882a593Smuzhiyun {
69*4882a593Smuzhiyun }
70*4882a593Smuzhiyun 
loongson_pm_enter(suspend_state_t state)71*4882a593Smuzhiyun static int loongson_pm_enter(suspend_state_t state)
72*4882a593Smuzhiyun {
73*4882a593Smuzhiyun 	mach_suspend();
74*4882a593Smuzhiyun 
75*4882a593Smuzhiyun 	mach_resume();
76*4882a593Smuzhiyun 
77*4882a593Smuzhiyun 	return 0;
78*4882a593Smuzhiyun }
79*4882a593Smuzhiyun 
loongson_pm_valid_state(suspend_state_t state)80*4882a593Smuzhiyun static int loongson_pm_valid_state(suspend_state_t state)
81*4882a593Smuzhiyun {
82*4882a593Smuzhiyun 	switch (state) {
83*4882a593Smuzhiyun 	case PM_SUSPEND_ON:
84*4882a593Smuzhiyun 	case PM_SUSPEND_STANDBY:
85*4882a593Smuzhiyun 	case PM_SUSPEND_MEM:
86*4882a593Smuzhiyun 		return 1;
87*4882a593Smuzhiyun 
88*4882a593Smuzhiyun 	default:
89*4882a593Smuzhiyun 		return 0;
90*4882a593Smuzhiyun 	}
91*4882a593Smuzhiyun }
92*4882a593Smuzhiyun 
93*4882a593Smuzhiyun static const struct platform_suspend_ops loongson_pm_ops = {
94*4882a593Smuzhiyun 	.valid	= loongson_pm_valid_state,
95*4882a593Smuzhiyun 	.enter	= loongson_pm_enter,
96*4882a593Smuzhiyun };
97*4882a593Smuzhiyun 
loongson_pm_init(void)98*4882a593Smuzhiyun static int __init loongson_pm_init(void)
99*4882a593Smuzhiyun {
100*4882a593Smuzhiyun 	suspend_set_ops(&loongson_pm_ops);
101*4882a593Smuzhiyun 
102*4882a593Smuzhiyun 	return 0;
103*4882a593Smuzhiyun }
104*4882a593Smuzhiyun arch_initcall(loongson_pm_init);
105