linux/arch/avr32/kernel/irq.c

/*
 * Copyright (C) 2004-2006 Atmel Corporation
 *
 * Based on arch/i386/kernel/irq.c
 *   Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This file contains the code used by various IRQ handling routines:
 * asking for different IRQ's should be done through these routines
 * instead of just grabbing them. Thus setups with different IRQ numbers
 * shouldn't result in any weird surprises, and installing new handlers
 * should be easier.
 *
 * IRQ's are in fact implemented a bit like signal handlers for the kernel.
 * Naturally it's not a 1:1 relation, but there are similarities.
 */

#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/kernel_stat.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/sysdev.h>

/*
 * 'what should we do if we get a hw irq event on an illegal vector'.
 * each architecture has to answer this themselves.
 */
void ack_bad_irq(unsigned int irq)
{
	printk("unexpected IRQ %u\n", irq);
}

#ifdef CONFIG_PROC_FS
int show_interrupts(struct seq_file *p, void *v)
{
	int i = *(loff_t *)v, cpu;
	struct irqaction *action;
	unsigned long flags;

	if (i == 0) {
		seq_puts(p, "           ");
		for_each_online_cpu(cpu)
			seq_printf(p, "CPU%d       ", cpu);
		seq_putc(p, '\n');
	}

	if (i < NR_IRQS) {
		spin_lock_irqsave(&irq_desc[i].lock, flags);
		action = irq_desc[i].action;
		if (!action)
			goto unlock;

		seq_printf(p, "%3d: ", i);
		for_each_online_cpu(cpu)
			seq_printf(p, "%10u ", kstat_cpu(cpu).irqs[i]);
		seq_printf(p, " %8s", irq_desc[i].chip->name ? : "-");
		seq_printf(p, "  %s", action->name);
		for (action = action->next; action; action = action->next)
			seq_printf(p, ", %s", action->name);

		seq_putc(p, '\n');
	unlock:
		spin_unlock_irqrestore(&irq_desc[i].lock, flags);
	}

	return 0;
}
#endif