LXR qemu/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 "hw/irq.h"
  27#include "qom/object.h"
  28
  29#define IRQ(obj) OBJECT_CHECK(struct IRQState, (obj), TYPE_IRQ)
  30
  31struct IRQState {
  32    Object parent_obj;
  33
  34    qemu_irq_handler handler;
  35    void *opaque;
  36    int n;
  37};
  38
  39void 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
  47qemu_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
  63qemu_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
  68qemu_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
  80void 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
  89void qemu_free_irq(qemu_irq irq)
  90{
  91    object_unref(OBJECT(irq));
  92}
  93
  94static 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
 101qemu_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
 108static 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
 115qemu_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
 123void qemu_irq_intercept_in(qemu_irq *gpio_in, qemu_irq_handler handler, int n)
 124{
 125    int i;
 126    qemu_irq *old_irqs = qemu_allocate_irqs(NULL, NULL, n);
 127    for (i = 0; i < n; i++) {
 128        *old_irqs[i] = *gpio_in[i];
 129        gpio_in[i]->handler = handler;
 130        gpio_in[i]->opaque = &old_irqs[i];
 131    }
 132}
 133
 134static const TypeInfo irq_type_info = {
 135   .name = TYPE_IRQ,
 136   .parent = TYPE_OBJECT,
 137   .instance_size = sizeof(struct IRQState),
 138};
 139
 140static void irq_register_types(void)
 141{
 142    type_register_static(&irq_type_info);
 143}
 144
 145type_init(irq_register_types)
 146