dn_ints.c

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#include <linux/interrupt.h>
#include <linux/irq.h>

#include <asm/traps.h>
#include <asm/apollohw.h>

unsigned int apollo_irq_startup(struct irq_data *data)
{
    unsigned int irq = data->irq;

    if (irq < 8)
        *(volatile unsigned char *)(pica+1) &= ~(1 << irq);
    else
        *(volatile unsigned char *)(picb+1) &= ~(1 << (irq - 8));
    return 0;
}

void apollo_irq_shutdown(struct irq_data *data)
{
    unsigned int irq = data->irq;

    if (irq < 8)
        *(volatile unsigned char *)(pica+1) |= (1 << irq);
    else
        *(volatile unsigned char *)(picb+1) |= (1 << (irq - 8));
}

void apollo_irq_eoi(struct irq_data *data)
{
    *(volatile unsigned char *)(pica) = 0x20;
    *(volatile unsigned char *)(picb) = 0x20;
}

static struct irq_chip apollo_irq_chip = {
    .name           = "apollo",
    .irq_startup    = apollo_irq_startup,
    .irq_shutdown   = apollo_irq_shutdown,
    .irq_eoi    = apollo_irq_eoi,
};


void __init dn_init_IRQ(void)
{
    m68k_setup_user_interrupt(VEC_USER + 96, 16);
    m68k_setup_irq_controller(&apollo_irq_chip, handle_fasteoi_irq,
                  IRQ_APOLLO, 16);
}