xref: /openbmc/qemu/hw/core/irq.c (revision 4703f6c2)
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 
29 OBJECT_DECLARE_SIMPLE_TYPE(IRQState, IRQ)
30 
31 struct IRQState {
32     Object parent_obj;
33 
34     qemu_irq_handler handler;
35     void *opaque;
36     int n;
37 };
38 
qemu_set_irq(qemu_irq irq,int level)39 void qemu_set_irq(qemu_irq irq, int level)
40 {
41     if (!irq)
42         return;
43 
44     irq->handler(irq->opaque, irq->n, level);
45 }
46 
qemu_extend_irqs(qemu_irq * old,int n_old,qemu_irq_handler handler,void * opaque,int n)47 qemu_irq *qemu_extend_irqs(qemu_irq *old, int n_old, qemu_irq_handler handler,
48                            void *opaque, int n)
49 {
50     qemu_irq *s;
51     int i;
52 
53     if (!old) {
54         n_old = 0;
55     }
56     s = old ? g_renew(qemu_irq, old, n + n_old) : g_new(qemu_irq, n);
57     for (i = n_old; i < n + n_old; i++) {
58         s[i] = qemu_allocate_irq(handler, opaque, i);
59     }
60     return s;
61 }
62 
qemu_allocate_irqs(qemu_irq_handler handler,void * opaque,int n)63 qemu_irq *qemu_allocate_irqs(qemu_irq_handler handler, void *opaque, int n)
64 {
65     return qemu_extend_irqs(NULL, 0, handler, opaque, n);
66 }
67 
qemu_allocate_irq(qemu_irq_handler handler,void * opaque,int n)68 qemu_irq qemu_allocate_irq(qemu_irq_handler handler, void *opaque, int n)
69 {
70     IRQState *irq;
71 
72     irq = IRQ(object_new(TYPE_IRQ));
73     irq->handler = handler;
74     irq->opaque = opaque;
75     irq->n = n;
76 
77     return irq;
78 }
79 
qemu_free_irqs(qemu_irq * s,int n)80 void qemu_free_irqs(qemu_irq *s, int n)
81 {
82     int i;
83     for (i = 0; i < n; i++) {
84         qemu_free_irq(s[i]);
85     }
86     g_free(s);
87 }
88 
qemu_free_irq(qemu_irq irq)89 void qemu_free_irq(qemu_irq irq)
90 {
91     object_unref(OBJECT(irq));
92 }
93 
qemu_notirq(void * opaque,int line,int level)94 static void qemu_notirq(void *opaque, int line, int level)
95 {
96     IRQState *irq = opaque;
97 
98     irq->handler(irq->opaque, irq->n, !level);
99 }
100 
qemu_irq_invert(qemu_irq irq)101 qemu_irq qemu_irq_invert(qemu_irq irq)
102 {
103     /* The default state for IRQs is low, so raise the output now.  */
104     qemu_irq_raise(irq);
105     return qemu_allocate_irq(qemu_notirq, irq, 0);
106 }
107 
qemu_irq_intercept_in(qemu_irq * gpio_in,qemu_irq_handler handler,int n)108 void qemu_irq_intercept_in(qemu_irq *gpio_in, qemu_irq_handler handler, int n)
109 {
110     int i;
111     qemu_irq *old_irqs = qemu_allocate_irqs(NULL, NULL, n);
112     for (i = 0; i < n; i++) {
113         *old_irqs[i] = *gpio_in[i];
114         gpio_in[i]->handler = handler;
115         gpio_in[i]->opaque = &old_irqs[i];
116     }
117 }
118 
119 static const TypeInfo irq_type_info = {
120    .name = TYPE_IRQ,
121    .parent = TYPE_OBJECT,
122    .instance_size = sizeof(IRQState),
123 };
124 
irq_register_types(void)125 static void irq_register_types(void)
126 {
127     type_register_static(&irq_type_info);
128 }
129 
130 type_init(irq_register_types)
131