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 | dc->props = 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 | |