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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * loongson-specific suspend support
- *
- * Copyright (C) 2009 Lemote Inc.
- * Author: Wu Zhangjin <[email protected]>
- */
- #include <linux/suspend.h>
- #include <linux/interrupt.h>
- #include <linux/pm.h>
- #include <asm/i8259.h>
- #include <asm/mipsregs.h>
- #include <loongson.h>
- static unsigned int __maybe_unused cached_master_mask; /* i8259A */
- static unsigned int __maybe_unused cached_slave_mask;
- static unsigned int __maybe_unused cached_bonito_irq_mask; /* bonito */
- void arch_suspend_disable_irqs(void)
- {
- /* disable all mips events */
- local_irq_disable();
- #ifdef CONFIG_I8259
- /* disable all events of i8259A */
- cached_slave_mask = inb(PIC_SLAVE_IMR);
- cached_master_mask = inb(PIC_MASTER_IMR);
- outb(0xff, PIC_SLAVE_IMR);
- inb(PIC_SLAVE_IMR);
- outb(0xff, PIC_MASTER_IMR);
- inb(PIC_MASTER_IMR);
- #endif
- /* disable all events of bonito */
- cached_bonito_irq_mask = LOONGSON_INTEN;
- LOONGSON_INTENCLR = 0xffff;
- (void)LOONGSON_INTENCLR;
- }
- void arch_suspend_enable_irqs(void)
- {
- /* enable all mips events */
- local_irq_enable();
- #ifdef CONFIG_I8259
- /* only enable the cached events of i8259A */
- outb(cached_slave_mask, PIC_SLAVE_IMR);
- outb(cached_master_mask, PIC_MASTER_IMR);
- #endif
- /* enable all cached events of bonito */
- LOONGSON_INTENSET = cached_bonito_irq_mask;
- (void)LOONGSON_INTENSET;
- }
- /*
- * Setup the board-specific events for waking up loongson from wait mode
- */
- void __weak setup_wakeup_events(void)
- {
- }
- void __weak mach_suspend(void)
- {
- }
- void __weak mach_resume(void)
- {
- }
- static int loongson_pm_enter(suspend_state_t state)
- {
- mach_suspend();
- mach_resume();
- return 0;
- }
- static int loongson_pm_valid_state(suspend_state_t state)
- {
- switch (state) {
- case PM_SUSPEND_ON:
- case PM_SUSPEND_STANDBY:
- case PM_SUSPEND_MEM:
- return 1;
- default:
- return 0;
- }
- }
- static const struct platform_suspend_ops loongson_pm_ops = {
- .valid = loongson_pm_valid_state,
- .enter = loongson_pm_enter,
- };
- static int __init loongson_pm_init(void)
- {
- suspend_set_ops(&loongson_pm_ops);
- return 0;
- }
- arch_initcall(loongson_pm_init);
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