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
16 static unsigned int
hpsim_irq_startup(struct irq_data * data)17 hpsim_irq_startup(struct irq_data *data)
18 {
19 return 0;
20 }
21
22 static void
hpsim_irq_noop(struct irq_data * data)23 hpsim_irq_noop(struct irq_data *data)
24 {
25 }
26
27 static int
hpsim_set_affinity_noop(struct irq_data * d,const struct cpumask * b,bool f)28 hpsim_set_affinity_noop(struct irq_data *d, const struct cpumask *b, bool f)
29 {
30 return 0;
31 }
32
33 static 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
hpsim_irq_set_chip(int irq)43 static 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
hpsim_connect_irq(int intr,int irq)51 static void hpsim_connect_irq(int intr, int irq)
52 {
53 ia64_ssc(intr, irq, 0, 0, SSC_CONNECT_INTERRUPT);
54 }
55
hpsim_get_irq(int intr)56 int 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
69 void __init
hpsim_irq_init(void)70 hpsim_irq_init (void)
71 {
72 int i;
73
74 for_each_active_irq(i)
75 hpsim_irq_set_chip(i);
76 }
77
