/* irq.c: FRV IRQ handling
 *
 * Copyright (C) 2003, 2004 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

/*
 * (mostly architecture independent, will move to kernel/irq.c in 2.5.)
 *
 * IRQs 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/config.h>
#include <linux/ptrace.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/timex.h>
#include <linux/slab.h>
#include <linux/random.h>
#include <linux/smp_lock.h>
#include <linux/init.h>
#include <linux/kernel_stat.h>
#include <linux/irq.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/module.h>

#include <asm/atomic.h>
#include <asm/io.h>
#include <asm/smp.h>
#include <asm/system.h>
#include <asm/bitops.h>
#include <asm/uaccess.h>
#include <asm/pgalloc.h>
#include <asm/delay.h>
#include <asm/irq.h>
#include <asm/irc-regs.h>
#include <asm/irq-routing.h>
#include <asm/gdb-stub.h>

extern void __init fpga_init(void);
extern void __init route_mb93493_irqs(void);

static void register_irq_proc (unsigned int irq);

/*
 * Special irq handlers.
 */

irqreturn_t no_action(int cpl, void *dev_id, struct pt_regs *regs) { return IRQ_HANDLED; }

atomic_t irq_err_count;

/*
 * Generic, controller-independent functions:
 */
int show_interrupts(struct seq_file *p, void *v)
{
	struct irqaction *action;
	struct irq_group *group;
	unsigned long flags;
	int level, grp, ix, i, j;

	i = *(loff_t *) v;

	switch (i) {
	case 0:
		seq_printf(p, "           ");
		for_each_online_cpu(j)
			seq_printf(p, "CPU%d       ",j);

		seq_putc(p, '\n');
		break;

	case 1 ... NR_IRQ_GROUPS * NR_IRQ_ACTIONS_PER_GROUP:
		local_irq_save(flags);

		grp = (i - 1) / NR_IRQ_ACTIONS_PER_GROUP;
		group = irq_groups[grp];
		if (!group)
			goto skip;

		ix = (i - 1) % NR_IRQ_ACTIONS_PER_GROUP;
		action = group->actions[ix];
		if (!action)
			goto skip;

		seq_printf(p, "%3d: ", i - 1);

#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 - 1]);
#endif

		level = group->sources[ix]->level - frv_irq_levels;

		seq_printf(p, " %12s@%x", group->sources[ix]->muxname, level);
		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:
		local_irq_restore(flags);
		break;

	case NR_IRQ_GROUPS * NR_IRQ_ACTIONS_PER_GROUP + 1:
		seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
		break;

	default:
		break;
	}

	return 0;
}


/*