arch/mips/loongson2ef/common/pm.c

Source file repositories/reference/linux-study-clean/arch/mips/loongson2ef/common/pm.c

File Facts

System
Linux kernel
Corpus path
arch/mips/loongson2ef/common/pm.c
Extension
.c
Size
3131 bytes
Lines
159
Domain
Architecture Layer
Bucket
arch/mips
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * loongson-specific suspend support
 *
 *  Copyright (C) 2009 Lemote Inc.
 *  Author: Wu Zhangjin <wuzhangjin@gmail.com>
 */
#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)
{
}

/*
 * Check wakeup events
 */
int __weak wakeup_loongson(void)
{
	return 1;
}

/*
 * If the events are really what we want to wakeup the CPU, wake it up
 * otherwise put the CPU asleep again.
 */
static void wait_for_wakeup_events(void)
{
	while (!wakeup_loongson())
		writel(readl(LOONGSON_CHIPCFG) & ~0x7, LOONGSON_CHIPCFG);
}

/*
 * Stop all perf counters
 *
 * $24 is the control register of Loongson perf counter
 */
static inline void stop_perf_counters(void)
{
	__write_64bit_c0_register($24, 0, 0);
}

Annotation

Implementation Notes