qemu/include/hw/core/split-irq.h
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   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/* This is a simple device which has one GPIO input line and multiple
  27 * GPIO output lines. Any change on the input line is forwarded to all
  28 * of the outputs.
  29 *
  30 * QEMU interface:
  31 *  + one unnamed GPIO input: the input line
  32 *  + N unnamed GPIO outputs: the output lines
  33 *  + QOM property "num-lines": sets the number of output lines
  34 */
  35#ifndef HW_SPLIT_IRQ_H
  36#define HW_SPLIT_IRQ_H
  37
  38#include "hw/sysbus.h"
  39#include "qom/object.h"
  40
  41#define TYPE_SPLIT_IRQ "split-irq"
  42
  43#define MAX_SPLIT_LINES 16
  44
  45typedef struct SplitIRQ SplitIRQ;
  46
  47#define SPLIT_IRQ(obj) OBJECT_CHECK(SplitIRQ, (obj), TYPE_SPLIT_IRQ)
  48
  49struct SplitIRQ {
  50    DeviceState parent_obj;
  51
  52    qemu_irq out_irq[MAX_SPLIT_LINES];
  53    uint16_t num_lines;
  54};
  55
  56#endif
  57