@samitouri / QOSamiQemu
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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/core/irq.h"
27 #include "qom/object.h"
28
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 if (unlikely(irq->observer)) {
36 irq->observer(irq->opaque, irq->n, level);
37 }
38 }
39
40 static void init_irq_fields(IRQState *irq, qemu_irq_handler handler,
41 void *opaque, int n)
42 {
43 irq->handler = handler;
44 irq->opaque = opaque;
45 irq->n = n;
46 }
47
48 void qemu_init_irq(IRQState *irq, qemu_irq_handler handler, void *opaque,
49 int n)
50 {
51 object_initialize(irq, sizeof(*irq), TYPE_IRQ);
52 init_irq_fields(irq, handler, opaque, n);
53 }
54
55 void qemu_init_irq_child(Object *parent, const char *propname,
56 IRQState *irq, qemu_irq_handler handler,
57 void *opaque, int n)
58 {
59 object_initialize_child(parent, propname, irq, TYPE_IRQ);
60 init_irq_fields(irq, handler, opaque, n);
61 }
62
63 void qemu_init_irqs(IRQState irq[], size_t count,
64 qemu_irq_handler handler, void *opaque)
65 {
66 for (size_t i = 0; i < count; i++) {
67 qemu_init_irq(&irq[i], handler, opaque, i);
68 }
69 }
70
71 qemu_irq *qemu_extend_irqs(qemu_irq *old, int n_old, qemu_irq_handler handler,
72 void *opaque, int n)
73 {
74 qemu_irq *s;
75 int i;
76
77 if (!old) {
78 n_old = 0;
79 }
80 s = old ? g_renew(qemu_irq, old, n + n_old) : g_new(qemu_irq, n);
81 for (i = n_old; i < n + n_old; i++) {
82 s[i] = qemu_allocate_irq(handler, opaque, i);
83 }
84 return s;
85 }
86
87 qemu_irq *qemu_allocate_irqs(qemu_irq_handler handler, void *opaque, int n)
88 {
89 return qemu_extend_irqs(NULL, 0, handler, opaque, n);
90 }
91
92 qemu_irq qemu_allocate_irq(qemu_irq_handler handler, void *opaque, int n)
93 {
94 IRQState *irq = IRQ(object_new(TYPE_IRQ));
95 init_irq_fields(irq, handler, opaque, n);
96 return irq;
97 }
98
99 void qemu_free_irqs(qemu_irq *s, int n)
100 {
101 int i;
102 for (i = 0; i < n; i++) {
103 qemu_free_irq(s[i]);
104 }
105 g_free(s);
106 }
107
108 void qemu_free_irq(qemu_irq irq)
109 {
110 object_unref(OBJECT(irq));
111 }
112
113 static void qemu_notirq(void *opaque, int line, int level)
114 {
115 IRQState *irq = opaque;
116
117 qemu_set_irq(irq, !level);
118 }
119
120 qemu_irq qemu_irq_invert(qemu_irq irq)
121 {
122 /* The default state for IRQs is low, so raise the output now. */
123 qemu_irq_raise(irq);
124 return qemu_allocate_irq(qemu_notirq, irq, 0);
125 }
126
127 void qemu_irq_set_observer(qemu_irq *gpio_in, qemu_irq_handler handler, int n)
128 {
129 int i;
130 for (i = 0; i < n; i++) {
131 gpio_in[i]->observer = handler;
132 }
133 }
134
135 static const TypeInfo irq_type_info = {
136 .name = TYPE_IRQ,
137 .parent = TYPE_OBJECT,
138 .instance_size = sizeof(IRQState),
139 };
140
141 static void irq_register_types(void)
142 {
143 type_register_static(&irq_type_info);
144 }
145
146 type_init(irq_register_types)