xref: /openbmc/qemu/hw/core/split-irq.c (revision ed75658a)
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)
93