1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * Platform dependent support for HP simulator.
 4 *
 5 * Copyright (C) 1998-2001 Hewlett-Packard Co
 6 * Copyright (C) 1998-2001 David Mosberger-Tang <davidm@hpl.hp.com>
 7 */
 8
 9#include <linux/init.h>
10#include <linux/kernel.h>
11#include <linux/sched.h>
12#include <linux/irq.h>
13
14#include "hpsim_ssc.h"
15
16static unsigned int
17hpsim_irq_startup(struct irq_data *data)
18{
19	return 0;
20}
21
22static void
23hpsim_irq_noop(struct irq_data *data)
24{
25}
26
27static int
28hpsim_set_affinity_noop(struct irq_data *d, const struct cpumask *b, bool f)
29{
30	return 0;
31}
32
33static struct irq_chip irq_type_hp_sim = {
34	.name =			"hpsim",
35	.irq_startup =		hpsim_irq_startup,
36	.irq_shutdown =		hpsim_irq_noop,
37	.irq_enable =		hpsim_irq_noop,
38	.irq_disable =		hpsim_irq_noop,
39	.irq_ack =		hpsim_irq_noop,
40	.irq_set_affinity =	hpsim_set_affinity_noop,
41};
42
43static void hpsim_irq_set_chip(int irq)
44{
45	struct irq_chip *chip = irq_get_chip(irq);
46
47	if (chip == &no_irq_chip)
48		irq_set_chip(irq, &irq_type_hp_sim);
49}
50
51static void hpsim_connect_irq(int intr, int irq)
52{
53	ia64_ssc(intr, irq, 0, 0, SSC_CONNECT_INTERRUPT);
54}
55
56int hpsim_get_irq(int intr)
57{
58	int irq = assign_irq_vector(AUTO_ASSIGN);
59
60	if (irq >= 0) {
61		hpsim_irq_set_chip(irq);
62		irq_set_handler(irq, handle_simple_irq);
63		hpsim_connect_irq(intr, irq);
64	}
65
66	return irq;
67}
68
69void __init
70hpsim_irq_init (void)
71{
72	int i;
73
74	for_each_active_irq(i)
75		hpsim_irq_set_chip(i);
76}