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   1 /*
   2  * linux/arch/m32r/kernel/irq.c
   3  *
   4  *  Copyright (c) 2003, 2004  Hitoshi Yamamoto
   5  *  Copyright (c) 2004  Hirokazu Takata <takata at linux-m32r.org>
   6  */
   7
   8 /*
   9  *      linux/arch/i386/kernel/irq.c
  10  *
  11  *      Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
  12  *
  13  * This file contains the lowest level m32r-specific interrupt
  14  * entry and irq statistics code. All the remaining irq logic is
  15  * done by the generic kernel/irq/ code and in the
  16  * m32r-specific irq controller code.
  17  */
  18
  19 #include <linux/kernel_stat.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/seq_file.h>
  22 #include <linux/module.h>
  23 #include <asm/uaccess.h>
  24
  25 atomic_t irq_err_count;
  26 atomic_t irq_mis_count;
  27
  28 /*
  29  * Generic, controller-independent functions:
  30  */
  31
  32 int show_interrupts(struct seq_file *p, void *v)
  33 {
  34         int i = *(loff_t *) v, j;
  35         struct irqaction * action;
  36         unsigned long flags;
  37
  38         if (i == 0) {
  39                 seq_printf(p, "           ");
  40                 for_each_online_cpu(j)
  41                         seq_printf(p, "CPU%d       ",j);
  42                 seq_putc(p, '\n');
  43         }
  44
  45         if (i < NR_IRQS) {
  46                 spin_lock_irqsave(&irq_desc[i].lock, flags);
  47                 action = irq_desc[i].action;
  48                 if (!action)
  49                         goto skip;
  50                 seq_printf(p, "%3d: ",i);
  51 #ifndef CONFIG_SMP
  52                 seq_printf(p, "%10u ", kstat_irqs(i));
  53 #else
  54                 for_each_online_cpu(j)
  55                         seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
  56 #endif
  57                 seq_printf(p, " %14s", irq_desc[i].chip->typename);
  58                 seq_printf(p, "  %s", action->name);
  59
  60                 for (action=action->next; action; action = action->next)
  61                         seq_printf(p, ", %s", action->name);
  62
  63                 seq_putc(p, '\n');
  64 skip:
  65                 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
  66         } else if (i == NR_IRQS) {
  67                 seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
  68                 seq_printf(p, "MIS: %10u\n", atomic_read(&irq_mis_count));
  69         }
  70         return 0;
  71 }
  72
  73 /*
  74  * do_IRQ handles all normal device IRQ's (the special
  75  * SMP cross-CPU interrupts have their own specific
  76  * handlers).
  77  */
  78 asmlinkage unsigned int do_IRQ(int irq, struct pt_regs *regs)
  79 {
  80         struct pt_regs *old_regs;
  81         old_regs = set_irq_regs(regs);
  82         irq_enter();
  83
  84 #ifdef CONFIG_DEBUG_STACKOVERFLOW
  85         /* FIXME M32R */
  86 #endif
  87         __do_IRQ(irq);
  88         irq_exit();
  89         set_irq_regs(old_regs);
  90
  91         return 1;
  92 }