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irq.c

/*
 * arch/sh/boards/landisk/irq.c
 *
 * I-O DATA Device, Inc. LANDISK Support
 *
 * Copyright (C) 2005-2007 kogiidena
 *
 * Copyright (C) 2001  Ian da Silva, Jeremy Siegel
 * Based largely on io_se.c.
 *
 * 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/irq.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <asm/landisk/iodata_landisk.h>

static void disable_landisk_irq(unsigned int irq)
{
      unsigned char mask = 0xff ^ (0x01 << (irq - 5));

      ctrl_outb(ctrl_inb(PA_IMASK) & mask, PA_IMASK);
}

static void enable_landisk_irq(unsigned int irq)
{
      unsigned char value = (0x01 << (irq - 5));

      ctrl_outb(ctrl_inb(PA_IMASK) | value, PA_IMASK);
}

static struct irq_chip landisk_irq_chip __read_mostly = {
      .name       = "LANDISK",
      .mask       = disable_landisk_irq,
      .unmask           = enable_landisk_irq,
      .mask_ack   = disable_landisk_irq,
};

/*
 * Initialize IRQ setting
 */
void __init init_landisk_IRQ(void)
{
      int i;

      for (i = 5; i < 14; i++) {
            disable_irq_nosync(i);
            set_irq_chip_and_handler_name(i, &landisk_irq_chip,
                                    handle_level_irq, "level");
            enable_landisk_irq(i);
      }
      ctrl_outb(0x00, PA_PWRINT_CLR);
}

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