hw/core/irq.c

   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-common.h"
  26 #include "hw/irq.h"
  27 #include "qom/object.h"
  28
  29 #define IRQ(obj) OBJECT_CHECK(struct IRQState, (obj), TYPE_IRQ)
  30
  31 struct IRQState {
  32     Object parent_obj;
  33
  34     qemu_irq_handler handler;
  35     void *opaque;
  36     int n;
  37 };
  38
  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
  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
  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
  68 qemu_irq qemu_allocate_irq(qemu_irq_handler handler, void *opaque, int n)
  69 {
  70     struct 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
  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
  89 void qemu_free_irq(qemu_irq irq)
  90 {
  91     object_unref(OBJECT(irq));
  92 }
  93
  94 static void qemu_notirq(void *opaque, int line, int level)
  95 {
  96     struct IRQState *irq = opaque;
  97
  98     irq->handler(irq->opaque, irq->n, !level);
  99 }
 100
 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
 108 static void qemu_splitirq(void *opaque, int line, int level)
 109 {
 110     struct IRQState **irq = opaque;
 111     irq[0]->handler(irq[0]->opaque, irq[0]->n, level);
 112     irq[1]->handler(irq[1]->opaque, irq[1]->n, level);
 113 }
 114
 115 qemu_irq qemu_irq_split(qemu_irq irq1, qemu_irq irq2)
 116 {
 117     qemu_irq *s = g_malloc0(2 * sizeof(qemu_irq));
 118     s[0] = irq1;
 119     s[1] = irq2;
 120     return qemu_allocate_irq(qemu_splitirq, s, 0);
 121 }
 122
 123 static void proxy_irq_handler(void *opaque, int n, int level)
 124 {
 125     qemu_irq **target = opaque;
 126
 127     if (*target) {
 128         qemu_set_irq((*target)[n], level);
 129     }
 130 }
 131
 132 qemu_irq *qemu_irq_proxy(qemu_irq **target, int n)
 133 {
 134     return qemu_allocate_irqs(proxy_irq_handler, target, n);
 135 }
 136
 137 void qemu_irq_intercept_in(qemu_irq *gpio_in, qemu_irq_handler handler, int n)
 138 {
 139     int i;
 140     qemu_irq *old_irqs = qemu_allocate_irqs(NULL, NULL, n);
 141     for (i = 0; i < n; i++) {
 142         *old_irqs[i] = *gpio_in[i];
 143         gpio_in[i]->handler = handler;
 144         gpio_in[i]->opaque = &old_irqs[i];
 145     }
 146 }
 147
 148 static const TypeInfo irq_type_info = {
 149    .name = TYPE_IRQ,
 150    .parent = TYPE_OBJECT,
 151    .instance_size = sizeof(struct IRQState),
 152 };
 153
 154 static void irq_register_types(void)
 155 {
 156     type_register_static(&irq_type_info);
 157 }
 158
 159 type_init(irq_register_types)