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
  33 static 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
  43 static void split_irq_init(Object *obj)
  44 {
  45     qdev_init_gpio_in(DEVICE(obj), split_irq_handler, 1);
  46 }
  47
  48 static 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
  62 static Property split_irq_properties[] = {
  63     DEFINE_PROP_UINT16("num-lines", SplitIRQ, num_lines, 1),
  64     DEFINE_PROP_END_OF_LIST(),
  65 };
  66
  67 static 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
  79 static 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
  87 static void split_irq_register_types(void)
  88 {
  89     type_register_static(&split_irq_type_info);
  90 }
  91
  92 type_init(split_irq_register_types)