xref: /openbmc/qemu/include/hw/core/split-irq.h (revision c122bca9)
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 
45 
46 OBJECT_DECLARE_SIMPLE_TYPE(SplitIRQ, SPLIT_IRQ)
47 
48 struct SplitIRQ {
49     DeviceState parent_obj;
50 
51     qemu_irq out_irq[MAX_SPLIT_LINES];
52     uint16_t num_lines;
53 };
54 
55 #endif
56