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 "hw/irq.h"
  29#include "hw/qdev-properties.h"
  30#include "qapi/error.h"
  31#include "qemu/module.h"
  32
  33static void split_irq_handler(void *opaque, int n, int level)
  34{
  35    SplitIRQ *s = SPLIT_IRQ(opaque);
  36    int i;
  37
  38    for (i = 0; i < s->num_lines; i++) {
  39        qemu_set_irq(s->out_irq[i], level);
  40    }
  41}
  42
  43static void split_irq_init(Object *obj)
  44{
  45    qdev_init_gpio_in(DEVICE(obj), split_irq_handler, 1);
  46}
  47
  48static void split_irq_realize(DeviceState *dev, Error **errp)
  49{
  50    SplitIRQ *s = SPLIT_IRQ(dev);
  51
  52    if (s->num_lines < 1 || s->num_lines >= MAX_SPLIT_LINES) {
  53        error_setg(errp,
  54                   "IRQ splitter number of lines %d is not between 1 and %d",
  55                   s->num_lines, MAX_SPLIT_LINES);
  56        return;
  57    }
  58
  59    qdev_init_gpio_out(dev, s->out_irq, s->num_lines);
  60}
  61
  62static Property split_irq_properties[] = {
  63    DEFINE_PROP_UINT16("num-lines", SplitIRQ, num_lines, 1),
  64    DEFINE_PROP_END_OF_LIST(),
  65};
  66
  67static void split_irq_class_init(ObjectClass *klass, void *data)
  68{
  69    DeviceClass *dc = DEVICE_CLASS(klass);
  70
  71    /* No state to reset or migrate */
  72    device_class_set_props(dc, split_irq_properties);
  73    dc->realize = split_irq_realize;
  74
  75    /* Reason: Needs to be wired up to work */
  76    dc->user_creatable = false;
  77}
  78
  79static const TypeInfo split_irq_type_info = {
  80   .name = TYPE_SPLIT_IRQ,
  81   .parent = TYPE_DEVICE,
  82   .instance_size = sizeof(SplitIRQ),
  83   .instance_init = split_irq_init,
  84   .class_init = split_irq_class_init,
  85};
  86
  87static void split_irq_register_types(void)
  88{
  89    type_register_static(&split_irq_type_info);
  90}
  91
  92type_init(split_irq_register_types)
  93