1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * loongson-specific suspend support
5 * Copyright (C) 2009 Lemote Inc.
6 * Author: Wu Zhangjin <wuzhangjin@gmail.com>
8 #include <linux/suspend.h>
9 #include <linux/interrupt.h>
12 #include <asm/i8259.h>
13 #include <asm/mipsregs.h>
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 */
21 void arch_suspend_disable_irqs(void)
23 /* disable all mips events */
27 /* disable all events of i8259A */
28 cached_slave_mask = inb(PIC_SLAVE_IMR);
29 cached_master_mask = inb(PIC_MASTER_IMR);
31 outb(0xff, PIC_SLAVE_IMR);
33 outb(0xff, PIC_MASTER_IMR);
36 /* disable all events of bonito */
37 cached_bonito_irq_mask = LOONGSON_INTEN;
38 LOONGSON_INTENCLR = 0xffff;
39 (void)LOONGSON_INTENCLR;
42 void arch_suspend_enable_irqs(void)
44 /* enable all mips events */
47 /* only enable the cached events of i8259A */
48 outb(cached_slave_mask, PIC_SLAVE_IMR);
49 outb(cached_master_mask, PIC_MASTER_IMR);
51 /* enable all cached events of bonito */
52 LOONGSON_INTENSET = cached_bonito_irq_mask;
53 (void)LOONGSON_INTENSET;
57 * Setup the board-specific events for waking up loongson from wait mode
59 void __weak setup_wakeup_events(void)
66 int __weak wakeup_loongson(void)
72 * If the events are really what we want to wakeup the CPU, wake it up
73 * otherwise put the CPU asleep again.
75 static void wait_for_wakeup_events(void)
77 while (!wakeup_loongson())
78 LOONGSON_CHIPCFG(0) &= ~0x7;
82 * Stop all perf counters
84 * $24 is the control register of Loongson perf counter
86 static inline void stop_perf_counters(void)
88 __write_64bit_c0_register($24, 0, 0);
92 static void loongson_suspend_enter(void)
94 static unsigned int cached_cpu_freq;
96 /* setup wakeup events via enabling the IRQs */
97 setup_wakeup_events();
101 cached_cpu_freq = LOONGSON_CHIPCFG(0);
103 /* Put CPU into wait mode */
104 LOONGSON_CHIPCFG(0) &= ~0x7;
106 /* wait for the given events to wakeup cpu from wait mode */
107 wait_for_wakeup_events();
109 LOONGSON_CHIPCFG(0) = cached_cpu_freq;
113 void __weak mach_suspend(void)
117 void __weak mach_resume(void)
121 static int loongson_pm_enter(suspend_state_t state)
125 /* processor specific suspend */
126 loongson_suspend_enter();
133 static int loongson_pm_valid_state(suspend_state_t state)
137 case PM_SUSPEND_STANDBY:
146 static const struct platform_suspend_ops loongson_pm_ops = {
147 .valid = loongson_pm_valid_state,
148 .enter = loongson_pm_enter,
151 static int __init loongson_pm_init(void)
153 suspend_set_ops(&loongson_pm_ops);
157 arch_initcall(loongson_pm_init);