LXR qemu/hw/core/split-irq.c

   1/*
   2 * IRQ splitter device.
   3 *
   4 * Copyright (c) 2018 Linaro Limited.
   5 * Written by Peter Maydell
   6 *
   7 * Permission is hereby granted, free of charge, to any person obtaining a copy
   8 * of this software and associated documentation files (the "Software"), to deal
   9 * in the Software without restriction, including without limitation the rights
  10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11 * copies of the Software, and to permit persons to whom the Software is
  12 * furnished to do so, subject to the following conditions:
  13 *
  14 * The above copyright notice and this permission notice shall be included in
  15 * all copies or substantial portions of the Software.
  16 *
  17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  23 * THE SOFTWARE.
  24 */
  25
  26#include "qemu/osdep.h"
  27#include "hw/core/split-irq.h"
  28#include "qapi/error.h"
  29
  30static void split_irq_handler(void *opaque, int n, int level)
  31{
  32    SplitIRQ *s = SPLIT_IRQ(opaque);
  33    int i;
  34
  35    for (i = 0; i < s->num_lines; i++) {
  36        qemu_set_irq(s->out_irq[i], level);
  37    }
  38}
  39
  40static void split_irq_init(Object *obj)
  41{
  42    qdev_init_gpio_in(DEVICE(obj), split_irq_handler, 1);
  43}
  44
  45static void split_irq_realize(DeviceState *dev, Error **errp)
  46{
  47    SplitIRQ *s = SPLIT_IRQ(dev);
  48
  49    if (s->num_lines < 1 || s->num_lines >= MAX_SPLIT_LINES) {
  50        error_setg(errp,
  51                   "IRQ splitter number of lines %d is not between 1 and %d",
  52                   s->num_lines, MAX_SPLIT_LINES);
  53        return;
  54    }
  55
  56    qdev_init_gpio_out(dev, s->out_irq, s->num_lines);
  57}
  58
  59static Property split_irq_properties[] = {
  60    DEFINE_PROP_UINT16("num-lines", SplitIRQ, num_lines, 1),
  61    DEFINE_PROP_END_OF_LIST(),
  62};
  63
  64static void split_irq_class_init(ObjectClass *klass, void *data)
  65{
  66    DeviceClass *dc = DEVICE_CLASS(klass);
  67
  68    /* No state to reset or migrate */
  69    dc->props = split_irq_properties;
  70    dc->realize = split_irq_realize;
  71
  72    /* Reason: Needs to be wired up to work */
  73    dc->user_creatable = false;
  74}
  75
  76static const TypeInfo split_irq_type_info = {
  77   .name = TYPE_SPLIT_IRQ,
  78   .parent = TYPE_DEVICE,
  79   .instance_size = sizeof(SplitIRQ),
  80   .instance_init = split_irq_init,
  81   .class_init = split_irq_class_init,
  82};
  83
  84static void split_irq_register_types(void)
  85{
  86    type_register_static(&split_irq_type_info);
  87}
  88
  89type_init(split_irq_register_types)
  90