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irq.c

/*
 * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
 * Copyright (C) 2007-2009 PetaLogix
 * Copyright (C) 2006 Atmark Techno, Inc.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License. See the file "COPYING" in the main directory of this archive
 * for more details.
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/hardirq.h>
#include <linux/interrupt.h>
#include <linux/irqflags.h>
#include <linux/seq_file.h>
#include <linux/kernel_stat.h>
#include <linux/irq.h>

#include <asm/prom.h>

unsigned int irq_of_parse_and_map(struct device_node *dev, int index)
{
      struct of_irq oirq;

      if (of_irq_map_one(dev, index, &oirq))
            return NO_IRQ;

      return oirq.specifier[0];
}
EXPORT_SYMBOL_GPL(irq_of_parse_and_map);

static u32 concurrent_irq;

void do_IRQ(struct pt_regs *regs)
{
      unsigned int irq;
      struct pt_regs *old_regs = set_irq_regs(regs);

      irq_enter();
      irq = get_irq(regs);
next_irq:
      BUG_ON(irq == -1U);
      generic_handle_irq(irq);

      irq = get_irq(regs);
      if (irq != -1U) {
            pr_debug("next irq: %d\n", irq);
            ++concurrent_irq;
            goto next_irq;
      }

      irq_exit();
      set_irq_regs(old_regs);
}

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

      if (i == 0) {
            seq_printf(p, "         ");
            for_each_online_cpu(j)
                  seq_printf(p, "CPU%-8d", j);
            seq_putc(p, '\n');
      }

      if (i < nr_irq) {
            spin_lock_irqsave(&irq_desc[i].lock, flags);
            action = irq_desc[i].action;
            if (!action)
                  goto skip;
            seq_printf(p, "%3d: ", i);
#ifndef CONFIG_SMP
            seq_printf(p, "%10u ", kstat_irqs(i));
#else
            for_each_online_cpu(j)
                  seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
#endif
            seq_printf(p, " %8s", irq_desc[i].status &
                              IRQ_LEVEL ? "level" : "edge");
            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');
skip:
            spin_unlock_irqrestore(&irq_desc[i].lock, flags);
      }
      return 0;
}

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