include/hw/core/split-irq.h

   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/irq.h"
  39 #include "hw/sysbus.h"
  40 #include "qom/object.h"
  41
  42 #define TYPE_SPLIT_IRQ "split-irq"
  43
  44 #define MAX_SPLIT_LINES 16
  45
  46 typedef struct SplitIRQ SplitIRQ;
  47
  48 #define SPLIT_IRQ(obj) OBJECT_CHECK(SplitIRQ, (obj), TYPE_SPLIT_IRQ)
  49
  50 struct SplitIRQ {
  51     DeviceState parent_obj;
  52
  53     qemu_irq out_irq[MAX_SPLIT_LINES];
  54     uint16_t num_lines;
  55 };
  56
  57 #endif