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