1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * LSAPIC Interrupt Controller
 4 *
 5 * This takes care of interrupts that are generated by the CPU's
 6 * internal Streamlined Advanced Programmable Interrupt Controller
 7 * (LSAPIC), such as the ITC and IPI interrupts.
 8    *
 9 * Copyright (C) 1999 VA Linux Systems
10 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
11 * Copyright (C) 2000 Hewlett-Packard Co
12 * Copyright (C) 2000 David Mosberger-Tang <davidm@hpl.hp.com>
13 */
14
15#include <linux/sched.h>
16#include <linux/irq.h>
17
18static unsigned int
19lsapic_noop_startup (struct irq_data *data)
20{
21	return 0;
22}
23
24static void
25lsapic_noop (struct irq_data *data)
26{
27	/* nothing to do... */
28}
29
30static int lsapic_retrigger(struct irq_data *data)
31{
32	ia64_resend_irq(data->irq);
33
34	return 1;
35}
36
37struct irq_chip irq_type_ia64_lsapic = {
38	.name =			"LSAPIC",
39	.irq_startup =		lsapic_noop_startup,
40	.irq_shutdown =		lsapic_noop,
41	.irq_enable =		lsapic_noop,
42	.irq_disable =		lsapic_noop,
43	.irq_ack =		lsapic_noop,
44	.irq_retrigger =	lsapic_retrigger,
45};