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irq.c

/*
 *  linux/arch/arm/mach-mmp/irq.c
 *
 *  Generic IRQ handling, GPIO IRQ demultiplexing, etc.
 *
 *  Author: Bin Yang <bin.yang@marvell.com>
 *  Created:      Sep 30, 2008
 *  Copyright:    Marvell International Ltd.
 *
 *  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.
 */

#include <linux/init.h>
#include <linux/irq.h>
#include <linux/io.h>

#include <mach/regs-icu.h>

#include "common.h"

#define IRQ_ROUTE_TO_AP       (ICU_INT_CONF_AP_INT | ICU_INT_CONF_IRQ)

#define PRIORITY_DEFAULT      0x1
#define PRIORITY_NONE         0x0   /* means IRQ disabled */

static void icu_mask_irq(unsigned int irq)
{
      __raw_writel(PRIORITY_NONE, ICU_INT_CONF(irq));
}

static void icu_unmask_irq(unsigned int irq)
{
      __raw_writel(IRQ_ROUTE_TO_AP | PRIORITY_DEFAULT, ICU_INT_CONF(irq));
}

static struct irq_chip icu_irq_chip = {
      .name = "icu_irq",
      .ack  = icu_mask_irq,
      .mask = icu_mask_irq,
      .unmask     = icu_unmask_irq,
};

void __init icu_init_irq(void)
{
      int irq;

      for (irq = 0; irq < 64; irq++) {
            icu_mask_irq(irq);
            set_irq_chip(irq, &icu_irq_chip);
            set_irq_handler(irq, handle_level_irq);
            set_irq_flags(irq, IRQF_VALID);
      }
}

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