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(&loongson_pm_ops);
101
102	return 0;
103}
104arch_initcall(loongson_pm_init);