1 | /* |
2 | * QEMU IRQ/GPIO common code. |
3 | * |
4 | * Copyright (c) 2016 Alistair Francis <alistair@alistair23.me>. |
5 | * |
6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
7 | * of this software and associated documentation files (the "Software"), to deal |
8 | * in the Software without restriction, including without limitation the rights |
9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
10 | * copies of the Software, and to permit persons to whom the Software is |
11 | * furnished to do so, subject to the following conditions: |
12 | * |
13 | * The above copyright notice and this permission notice shall be included in |
14 | * all copies or substantial portions of the Software. |
15 | * |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
22 | * THE SOFTWARE. |
23 | */ |
24 | |
25 | #include "qemu/osdep.h" |
26 | #include "hw/irq.h" |
27 | #include "hw/or-irq.h" |
28 | #include "hw/qdev-properties.h" |
29 | #include "migration/vmstate.h" |
30 | #include "qemu/module.h" |
31 | |
32 | static void or_irq_handler(void *opaque, int n, int level) |
33 | { |
34 | qemu_or_irq *s = OR_IRQ(opaque); |
35 | int or_level = 0; |
36 | int i; |
37 | |
38 | s->levels[n] = level; |
39 | |
40 | for (i = 0; i < s->num_lines; i++) { |
41 | or_level |= s->levels[i]; |
42 | } |
43 | |
44 | qemu_set_irq(s->out_irq, or_level); |
45 | } |
46 | |
47 | static void or_irq_reset(DeviceState *dev) |
48 | { |
49 | qemu_or_irq *s = OR_IRQ(dev); |
50 | int i; |
51 | |
52 | for (i = 0; i < MAX_OR_LINES; i++) { |
53 | s->levels[i] = false; |
54 | } |
55 | } |
56 | |
57 | static void or_irq_realize(DeviceState *dev, Error **errp) |
58 | { |
59 | qemu_or_irq *s = OR_IRQ(dev); |
60 | |
61 | assert(s->num_lines < MAX_OR_LINES); |
62 | |
63 | qdev_init_gpio_in(dev, or_irq_handler, s->num_lines); |
64 | } |
65 | |
66 | static void or_irq_init(Object *obj) |
67 | { |
68 | qemu_or_irq *s = OR_IRQ(obj); |
69 | |
70 | qdev_init_gpio_out(DEVICE(obj), &s->out_irq, 1); |
71 | } |
72 | |
73 | /* The original version of this device had a fixed 16 entries in its |
74 | * VMState array; devices with more inputs than this need to |
75 | * migrate the extra lines via a subsection. |
76 | * The subsection migrates as much of the levels[] array as is needed |
77 | * (including repeating the first 16 elements), to avoid the awkwardness |
78 | * of splitting it in two to meet the requirements of VMSTATE_VARRAY_UINT16. |
79 | */ |
80 | #define OLD_MAX_OR_LINES 16 |
81 | #if MAX_OR_LINES < OLD_MAX_OR_LINES |
82 | #error MAX_OR_LINES must be at least 16 for migration compatibility |
83 | #endif |
84 | |
85 | static bool (void *opaque) |
86 | { |
87 | qemu_or_irq *s = OR_IRQ(opaque); |
88 | |
89 | return s->num_lines >= OLD_MAX_OR_LINES; |
90 | } |
91 | |
92 | static const VMStateDescription = { |
93 | .name = "or-irq-extras" , |
94 | .version_id = 1, |
95 | .minimum_version_id = 1, |
96 | .needed = vmstate_extras_needed, |
97 | .fields = (VMStateField[]) { |
98 | VMSTATE_VARRAY_UINT16_UNSAFE(levels, qemu_or_irq, num_lines, 0, |
99 | vmstate_info_bool, bool), |
100 | VMSTATE_END_OF_LIST(), |
101 | }, |
102 | }; |
103 | |
104 | static const VMStateDescription vmstate_or_irq = { |
105 | .name = TYPE_OR_IRQ, |
106 | .version_id = 1, |
107 | .minimum_version_id = 1, |
108 | .fields = (VMStateField[]) { |
109 | VMSTATE_BOOL_SUB_ARRAY(levels, qemu_or_irq, 0, OLD_MAX_OR_LINES), |
110 | VMSTATE_END_OF_LIST(), |
111 | }, |
112 | .subsections = (const VMStateDescription*[]) { |
113 | &vmstate_or_irq_extras, |
114 | NULL |
115 | }, |
116 | }; |
117 | |
118 | static Property or_irq_properties[] = { |
119 | DEFINE_PROP_UINT16("num-lines" , qemu_or_irq, num_lines, 1), |
120 | DEFINE_PROP_END_OF_LIST(), |
121 | }; |
122 | |
123 | static void or_irq_class_init(ObjectClass *klass, void *data) |
124 | { |
125 | DeviceClass *dc = DEVICE_CLASS(klass); |
126 | |
127 | dc->reset = or_irq_reset; |
128 | dc->props = or_irq_properties; |
129 | dc->realize = or_irq_realize; |
130 | dc->vmsd = &vmstate_or_irq; |
131 | |
132 | /* Reason: Needs to be wired up to work, e.g. see stm32f205_soc.c */ |
133 | dc->user_creatable = false; |
134 | } |
135 | |
136 | static const TypeInfo or_irq_type_info = { |
137 | .name = TYPE_OR_IRQ, |
138 | .parent = TYPE_DEVICE, |
139 | .instance_size = sizeof(qemu_or_irq), |
140 | .instance_init = or_irq_init, |
141 | .class_init = or_irq_class_init, |
142 | }; |
143 | |
144 | static void or_irq_register_types(void) |
145 | { |
146 | type_register_static(&or_irq_type_info); |
147 | } |
148 | |
149 | type_init(or_irq_register_types) |
150 | |