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#include "qemu/module.h"
  30
  31static void split_irq_handler(void *opaque, int n, int level)
  32{
  33    SplitIRQ *s = SPLIT_IRQ(opaque);
  34    int i;
  35
  36    for (i = 0; i < s->num_lines; i++) {
  37        qemu_set_irq(s->out_irq[i], level);
  38    }
  39}
  40
  41static void split_irq_init(Object *obj)
  42{
  43    qdev_init_gpio_in(DEVICE(obj), split_irq_handler, 1);
  44}
  45
  46static void split_irq_realize(DeviceState *dev, Error **errp)
  47{
  48    SplitIRQ *s = SPLIT_IRQ(dev);
  49
  50    if (s->num_lines < 1 || s->num_lines >= MAX_SPLIT_LINES) {
  51        error_setg(errp,
  52                   "IRQ splitter number of lines %d is not between 1 and %d",
  53                   s->num_lines, MAX_SPLIT_LINES);
  54        return;
  55    }
  56
  57    qdev_init_gpio_out(dev, s->out_irq, s->num_lines);
  58}
  59
  60static Property split_irq_properties[] = {
  61    DEFINE_PROP_UINT16("num-lines", SplitIRQ, num_lines, 1),
  62    DEFINE_PROP_END_OF_LIST(),
  63};
  64
  65static void split_irq_class_init(ObjectClass *klass, void *data)
  66{
  67    DeviceClass *dc = DEVICE_CLASS(klass);
  68
  69    /* No state to reset or migrate */
  70    dc->props = split_irq_properties;
  71    dc->realize = split_irq_realize;
  72
  73    /* Reason: Needs to be wired up to work */
  74    dc->user_creatable = false;
  75}
  76
  77static const TypeInfo split_irq_type_info = {
  78   .name = TYPE_SPLIT_IRQ,
  79   .parent = TYPE_DEVICE,
  80   .instance_size = sizeof(SplitIRQ),
  81   .instance_init = split_irq_init,
  82   .class_init = split_irq_class_init,
  83};
  84
  85static void split_irq_register_types(void)
  86{
  87    type_register_static(&split_irq_type_info);
  88}
  89
  90type_init(split_irq_register_types)
  91