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irq-lh7a400.c

/* arch/arm/mach-lh7a40x/irq-lh7a400.c
 *
 *  Copyright (C) 2004 Coastal Environmental Systems
 *
 *  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/module.h>
#include <linux/interrupt.h>
#include <linux/ptrace.h>

#include <asm/hardware.h>
#include <asm/irq.h>
#include <asm/mach/irq.h>
#include <asm/arch/irqs.h>

#include "common.h"

  /* CPU IRQ handling */

static void lh7a400_mask_irq (u32 irq)
{
      INTC_INTENC = (1 << irq);
}

static void lh7a400_unmask_irq (u32 irq)
{
      INTC_INTENS = (1 << irq);
}

static void lh7a400_ack_gpio_irq (u32 irq)
{
      GPIO_GPIOFEOI = (1 << IRQ_TO_GPIO (irq));
      INTC_INTENC = (1 << irq);
}

static struct irq_chip lh7a400_internal_chip = {
      .name = "MPU",
      .ack  = lh7a400_mask_irq, /* Level triggering -> mask is ack */
      .mask = lh7a400_mask_irq,
      .unmask     = lh7a400_unmask_irq,
};

static struct irq_chip lh7a400_gpio_chip = {
      .name = "GPIO",
      .ack  = lh7a400_ack_gpio_irq,
      .mask = lh7a400_mask_irq,
      .unmask     = lh7a400_unmask_irq,
};


  /* IRQ initialization */

void __init lh7a400_init_irq (void)
{
      int irq;

      INTC_INTENC = 0xffffffff;     /* Disable all interrupts */
      GPIO_GPIOFINTEN = 0x00;       /* Disable all GPIOF interrupts */
      barrier ();

      for (irq = 0; irq < NR_IRQS; ++irq) {
            switch (irq) {
            case IRQ_GPIO0INTR:
            case IRQ_GPIO1INTR:
            case IRQ_GPIO2INTR:
            case IRQ_GPIO3INTR:
            case IRQ_GPIO4INTR:
            case IRQ_GPIO5INTR:
            case IRQ_GPIO6INTR:
            case IRQ_GPIO7INTR:
                  set_irq_chip (irq, &lh7a400_gpio_chip);
                  set_irq_handler (irq, do_level_IRQ); /* OK default */
                  break;
            default:
                  set_irq_chip (irq, &lh7a400_internal_chip);
                  set_irq_handler (irq, do_level_IRQ);
            }
            set_irq_flags (irq, IRQF_VALID);
      }

      lh7a40x_init_board_irq ();

/* *** FIXME: the LH7a400 does use FIQ interrupts in some cases.  For
   the time being, these are not initialized. */

/*    init_FIQ(); */
}

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