1 /*
2 * QEMU IRQ/GPIO common code.
3 *
4 * Copyright (c) 2007 CodeSourcery.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24 #include "qemu/osdep.h"
25 #include "qemu/main-loop.h"
26 #include "hw/irq.h"
27 #include "qom/object.h"
28
qemu_set_irq(qemu_irq irq,int level)29 void qemu_set_irq(qemu_irq irq, int level)
30 {
31 if (!irq)
32 return;
33
34 irq->handler(irq->opaque, irq->n, level);
35 }
36
qemu_init_irq(IRQState * irq,qemu_irq_handler handler,void * opaque,int n)37 void qemu_init_irq(IRQState *irq, qemu_irq_handler handler, void *opaque,
38 int n)
39 {
40 object_initialize(irq, sizeof(*irq), TYPE_IRQ);
41 irq->handler = handler;
42 irq->opaque = opaque;
43 irq->n = n;
44 }
45
qemu_extend_irqs(qemu_irq * old,int n_old,qemu_irq_handler handler,void * opaque,int n)46 qemu_irq *qemu_extend_irqs(qemu_irq *old, int n_old, qemu_irq_handler handler,
47 void *opaque, int n)
48 {
49 qemu_irq *s;
50 int i;
51
52 if (!old) {
53 n_old = 0;
54 }
55 s = old ? g_renew(qemu_irq, old, n + n_old) : g_new(qemu_irq, n);
56 for (i = n_old; i < n + n_old; i++) {
57 s[i] = qemu_allocate_irq(handler, opaque, i);
58 }
59 return s;
60 }
61
qemu_allocate_irqs(qemu_irq_handler handler,void * opaque,int n)62 qemu_irq *qemu_allocate_irqs(qemu_irq_handler handler, void *opaque, int n)
63 {
64 return qemu_extend_irqs(NULL, 0, handler, opaque, n);
65 }
66
qemu_allocate_irq(qemu_irq_handler handler,void * opaque,int n)67 qemu_irq qemu_allocate_irq(qemu_irq_handler handler, void *opaque, int n)
68 {
69 IRQState *irq;
70
71 irq = g_new(IRQState, 1);
72 qemu_init_irq(irq, handler, opaque, n);
73
74 return irq;
75 }
76
qemu_free_irqs(qemu_irq * s,int n)77 void qemu_free_irqs(qemu_irq *s, int n)
78 {
79 int i;
80 for (i = 0; i < n; i++) {
81 qemu_free_irq(s[i]);
82 }
83 g_free(s);
84 }
85
qemu_free_irq(qemu_irq irq)86 void qemu_free_irq(qemu_irq irq)
87 {
88 object_unref(OBJECT(irq));
89 }
90
qemu_notirq(void * opaque,int line,int level)91 static void qemu_notirq(void *opaque, int line, int level)
92 {
93 IRQState *irq = opaque;
94
95 irq->handler(irq->opaque, irq->n, !level);
96 }
97
qemu_irq_invert(qemu_irq irq)98 qemu_irq qemu_irq_invert(qemu_irq irq)
99 {
100 /* The default state for IRQs is low, so raise the output now. */
101 qemu_irq_raise(irq);
102 return qemu_allocate_irq(qemu_notirq, irq, 0);
103 }
104
qemu_irq_intercept_in(qemu_irq * gpio_in,qemu_irq_handler handler,int n)105 void qemu_irq_intercept_in(qemu_irq *gpio_in, qemu_irq_handler handler, int n)
106 {
107 int i;
108 qemu_irq *old_irqs = qemu_allocate_irqs(NULL, NULL, n);
109 for (i = 0; i < n; i++) {
110 *old_irqs[i] = *gpio_in[i];
111 gpio_in[i]->handler = handler;
112 gpio_in[i]->opaque = &old_irqs[i];
113 }
114 }
115
116 static const TypeInfo irq_type_info = {
117 .name = TYPE_IRQ,
118 .parent = TYPE_OBJECT,
119 .instance_size = sizeof(IRQState),
120 };
121
irq_register_types(void)122 static void irq_register_types(void)
123 {
124 type_register_static(&irq_type_info);
125 }
126
127 type_init(irq_register_types)
128