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