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