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sun3ints.c

 /*
 * 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)
{
      *sun3_intreg |=  (1 << irq);
      if (!(kstat_cpu(0).irqs[irq] % 2000))
            sun3_leds(led_pattern[(kstat_cpu(0).irqs[irq] % 16000) / 2000]);
      return IRQ_HANDLED;
}

static irqreturn_t sun3_int5(int irq, void *dev_id)
{
#ifdef CONFIG_SUN3
      intersil_clear();
#endif
        *sun3_intreg |=  (1 << irq);
#ifdef CONFIG_SUN3
      intersil_clear();
#endif
        do_timer(1);
#ifndef CONFIG_SMP
      update_process_times(user_mode(get_irq_regs()));
#endif
        if (!(kstat_cpu(0).irqs[irq] % 20))
                sun3_leds(led_pattern[(kstat_cpu(0).irqs[irq] % 160) / 20]);
      return IRQ_HANDLED;
}

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

static void sun3_inthandle(unsigned int irq, struct pt_regs *fp)
{
        *sun3_intreg &= ~(1 << irq);

      __m68k_handle_int(irq, fp);
}

static struct irq_controller sun3_irq_controller = {
      .name       = "sun3",
      .lock       = __SPIN_LOCK_UNLOCKED(sun3_irq_controller.lock),
      .startup    = m68k_irq_startup,
      .shutdown   = m68k_irq_shutdown,
      .enable           = sun3_enable_irq,
      .disable    = sun3_disable_irq,
};

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

      m68k_setup_auto_interrupt(sun3_inthandle);
      m68k_setup_irq_controller(&sun3_irq_controller, IRQ_AUTO_1, 7);
      m68k_setup_user_interrupt(VEC_USER, 128, NULL);

      request_irq(IRQ_AUTO_5, sun3_int5, 0, "int5", NULL);
      request_irq(IRQ_AUTO_7, sun3_int7, 0, "int7", NULL);
      request_irq(IRQ_USER+127, sun3_vec255, 0, "vec255", NULL);
}

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