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