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
  31 static 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
  41 static void split_irq_init(Object *obj)
  42 {
  43     qdev_init_gpio_in(DEVICE(obj), split_irq_handler, 1);
  44 }
  45
  46 static 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
  60 static Property split_irq_properties[] = {
  61     DEFINE_PROP_UINT16("num-lines", SplitIRQ, num_lines, 1),
  62     DEFINE_PROP_END_OF_LIST(),
  63 };
  64
  65 static 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
  77 static 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
  85 static void split_irq_register_types(void)
  86 {
  87     type_register_static(&split_irq_type_info);
  88 }
  89
  90 type_init(split_irq_register_types)