sun3ints.c

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 /*
 * linux/arch/m68k/sun3/sun3ints.c -- Sun-3(x) Linux interrupt handling code
 *
 * 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/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/kernel_stat.h>
#include <linux/interrupt.h>
#include <asm/segment.h>
#include <asm/intersil.h>
#include <asm/oplib.h>
#include <asm/sun3ints.h>
#include <asm/irq_regs.h>
#include <linux/seq_file.h>

extern void sun3_leds (unsigned char);

void sun3_disable_interrupts(void)
{
    sun3_disable_irq(0);
}

void sun3_enable_interrupts(void)
{
    sun3_enable_irq(0);
}

static int led_pattern[8] = {
       ~(0x80), ~(0x01),
       ~(0x40), ~(0x02),
       ~(0x20), ~(0x04),
       ~(0x10), ~(0x08)
};

volatile unsigned char* sun3_intreg;

void sun3_enable_irq(unsigned int irq)
{
    *sun3_intreg |=  (1 << irq);
}

void sun3_disable_irq(unsigned int irq)
{
    *sun3_intreg &= ~(1 << irq);
}

static irqreturn_t sun3_int7(int irq, void *dev_id)
{
    unsigned int cnt;

    cnt = kstat_irqs_cpu(irq, 0);
    if (!(cnt % 2000))
        sun3_leds(led_pattern[cnt % 16000 / 2000]);
    return IRQ_HANDLED;
}

static irqreturn_t sun3_int5(int irq, void *dev_id)
{
    unsigned int cnt;

#ifdef CONFIG_SUN3
    intersil_clear();
#endif
#ifdef CONFIG_SUN3
    intersil_clear();
#endif
    xtime_update(1);
    update_process_times(user_mode(get_irq_regs()));
    cnt = kstat_irqs_cpu(irq, 0);
    if (!(cnt % 20))
        sun3_leds(led_pattern[cnt % 160 / 20]);
    return IRQ_HANDLED;
}

static irqreturn_t sun3_vec255(int irq, void *dev_id)
{
//  intersil_clear();
    return IRQ_HANDLED;
}

static void sun3_irq_enable(struct irq_data *data)
{
    sun3_enable_irq(data->irq);
};

static void sun3_irq_disable(struct irq_data *data)
{
    sun3_disable_irq(data->irq);
};

static struct irq_chip sun3_irq_chip = {
    .name       = "sun3",
    .irq_startup    = m68k_irq_startup,
    .irq_shutdown   = m68k_irq_shutdown,
    .irq_enable = sun3_irq_enable,
    .irq_disable    = sun3_irq_disable,
    .irq_mask   = sun3_irq_disable,
    .irq_unmask = sun3_irq_enable,
};

void __init sun3_init_IRQ(void)
{
    *sun3_intreg = 1;

    m68k_setup_irq_controller(&sun3_irq_chip, handle_level_irq, IRQ_AUTO_1,
                  7);
    m68k_setup_user_interrupt(VEC_USER, 128);

    if (request_irq(IRQ_AUTO_5, sun3_int5, 0, "int5", NULL))
        pr_err("Couldn't register %s interrupt\n", "int5");
    if (request_irq(IRQ_AUTO_7, sun3_int7, 0, "int7", NULL))
        pr_err("Couldn't register %s interrupt\n", "int7");
    if (request_irq(IRQ_USER+127, sun3_vec255, 0, "vec255", NULL))
        pr_err("Couldn't register %s interrupt\n", "vec255");
}