hpsim_irq.c

Go to the documentation of this file.

/*
 * Platform dependent support for HP simulator.
 *
 * Copyright (C) 1998-2001 Hewlett-Packard Co
 * Copyright (C) 1998-2001 David Mosberger-Tang <[email protected]>
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/irq.h>

#include "hpsim_ssc.h"

static unsigned int
hpsim_irq_startup(struct irq_data *data)
{
    return 0;
}

static void
hpsim_irq_noop(struct irq_data *data)
{
}

static int
hpsim_set_affinity_noop(struct irq_data *d, const struct cpumask *b, bool f)
{
    return 0;
}

static struct irq_chip irq_type_hp_sim = {
    .name =         "hpsim",
    .irq_startup =      hpsim_irq_startup,
    .irq_shutdown =     hpsim_irq_noop,
    .irq_enable =       hpsim_irq_noop,
    .irq_disable =      hpsim_irq_noop,
    .irq_ack =      hpsim_irq_noop,
    .irq_set_affinity = hpsim_set_affinity_noop,
};

static void hpsim_irq_set_chip(int irq)
{
    struct irq_chip *chip = irq_get_chip(irq);

    if (chip == &no_irq_chip)
        irq_set_chip(irq, &irq_type_hp_sim);
}

static void hpsim_connect_irq(int intr, int irq)
{
    ia64_ssc(intr, irq, 0, 0, SSC_CONNECT_INTERRUPT);
}

int hpsim_get_irq(int intr)
{
    int irq = assign_irq_vector(AUTO_ASSIGN);

    if (irq >= 0) {
        hpsim_irq_set_chip(irq);
        irq_set_handler(irq, handle_simple_irq);
        hpsim_connect_irq(intr, irq);
    }

    return irq;
}

void __init
hpsim_irq_init (void)
{
    int i;

    for_each_active_irq(i)
        hpsim_irq_set_chip(i);
}