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/main-loop.h"
  26 #include "qemu-common.h"
  27 #include "hw/irq.h"
  28 #include "qom/object.h"
  29
  30 #define IRQ(obj) OBJECT_CHECK(struct IRQState, (obj), TYPE_IRQ)
  31
  32 struct IRQState {
  33     Object parent_obj;
  34
  35     qemu_irq_handler handler;
  36     void *opaque;
  37     int n;
  38 };
  39
  40 void qemu_set_irq(qemu_irq irq, int level)
  41 {
  42     if (!irq)
  43         return;
  44
  45     irq->handler(irq->opaque, irq->n, level);
  46 }
  47
  48 qemu_irq *qemu_extend_irqs(qemu_irq *old, int n_old, qemu_irq_handler handler,
  49                            void *opaque, int n)
  50 {
  51     qemu_irq *s;
  52     int i;
  53
  54     if (!old) {
  55         n_old = 0;
  56     }
  57     s = old ? g_renew(qemu_irq, old, n + n_old) : g_new(qemu_irq, n);
  58     for (i = n_old; i < n + n_old; i++) {
  59         s[i] = qemu_allocate_irq(handler, opaque, i);
  60     }
  61     return s;
  62 }
  63
  64 qemu_irq *qemu_allocate_irqs(qemu_irq_handler handler, void *opaque, int n)
  65 {
  66     return qemu_extend_irqs(NULL, 0, handler, opaque, n);
  67 }
  68
  69 qemu_irq qemu_allocate_irq(qemu_irq_handler handler, void *opaque, int n)
  70 {
  71     struct IRQState *irq;
  72
  73     irq = IRQ(object_new(TYPE_IRQ));
  74     irq->handler = handler;
  75     irq->opaque = opaque;
  76     irq->n = n;
  77
  78     return irq;
  79 }
  80
  81 void qemu_free_irqs(qemu_irq *s, int n)
  82 {
  83     int i;
  84     for (i = 0; i < n; i++) {
  85         qemu_free_irq(s[i]);
  86     }
  87     g_free(s);
  88 }
  89
  90 void qemu_free_irq(qemu_irq irq)
  91 {
  92     object_unref(OBJECT(irq));
  93 }
  94
  95 static void qemu_notirq(void *opaque, int line, int level)
  96 {
  97     struct IRQState *irq = opaque;
  98
  99     irq->handler(irq->opaque, irq->n, !level);
 100 }
 101
 102 qemu_irq qemu_irq_invert(qemu_irq irq)
 103 {
 104     /* The default state for IRQs is low, so raise the output now.  */
 105     qemu_irq_raise(irq);
 106     return qemu_allocate_irq(qemu_notirq, irq, 0);
 107 }
 108
 109 static void qemu_splitirq(void *opaque, int line, int level)
 110 {
 111     struct IRQState **irq = opaque;
 112     irq[0]->handler(irq[0]->opaque, irq[0]->n, level);
 113     irq[1]->handler(irq[1]->opaque, irq[1]->n, level);
 114 }
 115
 116 qemu_irq qemu_irq_split(qemu_irq irq1, qemu_irq irq2)
 117 {
 118     qemu_irq *s = g_malloc0(2 * sizeof(qemu_irq));
 119     s[0] = irq1;
 120     s[1] = irq2;
 121     return qemu_allocate_irq(qemu_splitirq, s, 0);
 122 }
 123
 124 static void proxy_irq_handler(void *opaque, int n, int level)
 125 {
 126     qemu_irq **target = opaque;
 127
 128     if (*target) {
 129         qemu_set_irq((*target)[n], level);
 130     }
 131 }
 132
 133 qemu_irq *qemu_irq_proxy(qemu_irq **target, int n)
 134 {
 135     return qemu_allocate_irqs(proxy_irq_handler, target, n);
 136 }
 137
 138 void qemu_irq_intercept_in(qemu_irq *gpio_in, qemu_irq_handler handler, int n)
 139 {
 140     int i;
 141     qemu_irq *old_irqs = qemu_allocate_irqs(NULL, NULL, n);
 142     for (i = 0; i < n; i++) {
 143         *old_irqs[i] = *gpio_in[i];
 144         gpio_in[i]->handler = handler;
 145         gpio_in[i]->opaque = &old_irqs[i];
 146     }
 147 }
 148
 149 static const TypeInfo irq_type_info = {
 150    .name = TYPE_IRQ,
 151    .parent = TYPE_OBJECT,
 152    .instance_size = sizeof(struct IRQState),
 153 };
 154
 155 static void irq_register_types(void)
 156 {
 157     type_register_static(&irq_type_info);
 158 }
 159
 160 type_init(irq_register_types)