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
init_irq_fields(IRQState * irq,qemu_irq_handler handler,void * opaque,int n)37 static void init_irq_fields(IRQState *irq, qemu_irq_handler handler,
38 void *opaque, int n)
39 {
40 irq->handler = handler;
41 irq->opaque = opaque;
42 irq->n = n;
43 }
44
qemu_init_irq(IRQState * irq,qemu_irq_handler handler,void * opaque,int n)45 void qemu_init_irq(IRQState *irq, qemu_irq_handler handler, void *opaque,
46 int n)
47 {
48 object_initialize(irq, sizeof(*irq), TYPE_IRQ);
49 init_irq_fields(irq, handler, opaque, n);
50 }
51
qemu_init_irqs(IRQState irq[],size_t count,qemu_irq_handler handler,void * opaque)52 void qemu_init_irqs(IRQState irq[], size_t count,
53 qemu_irq_handler handler, void *opaque)
54 {
55 for (size_t i = 0; i < count; i++) {
56 qemu_init_irq(&irq[i], handler, opaque, i);
57 }
58 }
59
qemu_extend_irqs(qemu_irq * old,int n_old,qemu_irq_handler handler,void * opaque,int n)60 qemu_irq *qemu_extend_irqs(qemu_irq *old, int n_old, qemu_irq_handler handler,
61 void *opaque, int n)
62 {
63 qemu_irq *s;
64 int i;
65
66 if (!old) {
67 n_old = 0;
68 }
69 s = old ? g_renew(qemu_irq, old, n + n_old) : g_new(qemu_irq, n);
70 for (i = n_old; i < n + n_old; i++) {
71 s[i] = qemu_allocate_irq(handler, opaque, i);
72 }
73 return s;
74 }
75
qemu_allocate_irqs(qemu_irq_handler handler,void * opaque,int n)76 qemu_irq *qemu_allocate_irqs(qemu_irq_handler handler, void *opaque, int n)
77 {
78 return qemu_extend_irqs(NULL, 0, handler, opaque, n);
79 }
80
qemu_allocate_irq(qemu_irq_handler handler,void * opaque,int n)81 qemu_irq qemu_allocate_irq(qemu_irq_handler handler, void *opaque, int n)
82 {
83 IRQState *irq = IRQ(object_new(TYPE_IRQ));
84 init_irq_fields(irq, handler, opaque, n);
85 return irq;
86 }
87
qemu_free_irqs(qemu_irq * s,int n)88 void qemu_free_irqs(qemu_irq *s, int n)
89 {
90 int i;
91 for (i = 0; i < n; i++) {
92 qemu_free_irq(s[i]);
93 }
94 g_free(s);
95 }
96
qemu_free_irq(qemu_irq irq)97 void qemu_free_irq(qemu_irq irq)
98 {
99 object_unref(OBJECT(irq));
100 }
101
qemu_notirq(void * opaque,int line,int level)102 static void qemu_notirq(void *opaque, int line, int level)
103 {
104 IRQState *irq = opaque;
105
106 irq->handler(irq->opaque, irq->n, !level);
107 }
108
qemu_irq_invert(qemu_irq irq)109 qemu_irq qemu_irq_invert(qemu_irq irq)
110 {
111 /* The default state for IRQs is low, so raise the output now. */
112 qemu_irq_raise(irq);
113 return qemu_allocate_irq(qemu_notirq, irq, 0);
114 }
115
qemu_irq_intercept_in(qemu_irq * gpio_in,qemu_irq_handler handler,int n)116 void qemu_irq_intercept_in(qemu_irq *gpio_in, qemu_irq_handler handler, int n)
117 {
118 int i;
119 qemu_irq *old_irqs = qemu_allocate_irqs(NULL, NULL, n);
120 for (i = 0; i < n; i++) {
121 *old_irqs[i] = *gpio_in[i];
122 gpio_in[i]->handler = handler;
123 gpio_in[i]->opaque = &old_irqs[i];
124 }
125 }
126
127 static const TypeInfo irq_type_info = {
128 .name = TYPE_IRQ,
129 .parent = TYPE_OBJECT,
130 .instance_size = sizeof(IRQState),
131 };
132
irq_register_types(void)133 static void irq_register_types(void)
134 {
135 type_register_static(&irq_type_info);
136 }
137
138 type_init(irq_register_types)
139