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 "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
  32struct IRQState {
  33    Object parent_obj;
  34
  35    qemu_irq_handler handler;
  36    void *opaque;
  37    int n;
  38};
  39
  40void 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
  48qemu_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
  64qemu_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
  69qemu_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
  81void 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
  90void qemu_free_irq(qemu_irq irq)
  91{
  92    object_unref(OBJECT(irq));
  93}
  94
  95static 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
 102qemu_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
 109static 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
 116qemu_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
 124static 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
 133qemu_irq *qemu_irq_proxy(qemu_irq **target, int n)
 134{
 135    return qemu_allocate_irqs(proxy_irq_handler, target, n);
 136}
 137
 138void 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
 149static const TypeInfo irq_type_info = {
 150   .name = TYPE_IRQ,
 151   .parent = TYPE_OBJECT,
 152   .instance_size = sizeof(struct IRQState),
 153};
 154
 155static void irq_register_types(void)
 156{
 157    type_register_static(&irq_type_info);
 158}
 159
 160type_init(irq_register_types)
 161