arch/avr32/kernel/irq.c

   1 /*
   2  * Copyright (C) 2004-2006 Atmel Corporation
   3  *
   4  * Based on arch/i386/kernel/irq.c
   5  *   Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  * This file contains the code used by various IRQ handling routines:
  12  * asking for different IRQ's should be done through these routines
  13  * instead of just grabbing them. Thus setups with different IRQ numbers
  14  * shouldn't result in any weird surprises, and installing new handlers
  15  * should be easier.
  16  *
  17  * IRQ's are in fact implemented a bit like signal handlers for the kernel.
  18  * Naturally it's not a 1:1 relation, but there are similarities.
  19  */
  20
  21 #include <linux/interrupt.h>
  22 #include <linux/irq.h>
  23 #include <linux/kernel_stat.h>
  24 #include <linux/proc_fs.h>
  25 #include <linux/seq_file.h>
  26 #include <linux/sysdev.h>
  27
  28 /*
  29  * 'what should we do if we get a hw irq event on an illegal vector'.
  30  * each architecture has to answer this themselves.
  31  */
  32 void ack_bad_irq(unsigned int irq)
  33 {
  34         printk("unexpected IRQ %u\n", irq);
  35 }
  36
  37 #ifdef CONFIG_PROC_FS
  38 int show_interrupts(struct seq_file *p, void *v)
  39 {
  40         int i = *(loff_t *)v, cpu;
  41         struct irqaction *action;
  42         unsigned long flags;
  43
  44         if (i == 0) {
  45                 seq_puts(p, "           ");
  46                 for_each_online_cpu(cpu)
  47                         seq_printf(p, "CPU%d       ", cpu);
  48                 seq_putc(p, '\n');
  49         }
  50
  51         if (i < NR_IRQS) {
  52                 spin_lock_irqsave(&irq_desc[i].lock, flags);
  53                 action = irq_desc[i].action;
  54                 if (!action)
  55                         goto unlock;
  56
  57                 seq_printf(p, "%3d: ", i);
  58                 for_each_online_cpu(cpu)
  59                         seq_printf(p, "%10u ", kstat_cpu(cpu).irqs[i]);
  60                 seq_printf(p, " %8s", irq_desc[i].chip->name ? : "-");
  61                 seq_printf(p, "  %s", action->name);
  62                 for (action = action->next; action; action = action->next)
  63                         seq_printf(p, ", %s", action->name);
  64
  65                 seq_putc(p, '\n');
  66         unlock:
  67                 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
  68         }
  69
  70         return 0;
  71 }
  72 #endif