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1b255677 AF |
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/or-irq.h" | |
27 | ||
28 | static void or_irq_handler(void *opaque, int n, int level) | |
29 | { | |
30 | qemu_or_irq *s = OR_IRQ(opaque); | |
31 | int or_level = 0; | |
32 | int i; | |
33 | ||
34 | s->levels[n] = level; | |
35 | ||
36 | for (i = 0; i < s->num_lines; i++) { | |
37 | or_level |= s->levels[i]; | |
38 | } | |
39 | ||
40 | qemu_set_irq(s->out_irq, or_level); | |
41 | } | |
42 | ||
43 | static void or_irq_reset(DeviceState *dev) | |
44 | { | |
45 | qemu_or_irq *s = OR_IRQ(dev); | |
46 | int i; | |
47 | ||
48 | for (i = 0; i < MAX_OR_LINES; i++) { | |
49 | s->levels[i] = false; | |
50 | } | |
51 | } | |
52 | ||
53 | static void or_irq_realize(DeviceState *dev, Error **errp) | |
54 | { | |
55 | qemu_or_irq *s = OR_IRQ(dev); | |
56 | ||
57 | assert(s->num_lines < MAX_OR_LINES); | |
58 | ||
59 | qdev_init_gpio_in(dev, or_irq_handler, s->num_lines); | |
60 | } | |
61 | ||
62 | static void or_irq_init(Object *obj) | |
63 | { | |
64 | qemu_or_irq *s = OR_IRQ(obj); | |
65 | ||
66 | qdev_init_gpio_out(DEVICE(obj), &s->out_irq, 1); | |
67 | } | |
68 | ||
f81804a5 PM |
69 | /* The original version of this device had a fixed 16 entries in its |
70 | * VMState array; devices with more inputs than this need to | |
71 | * migrate the extra lines via a subsection. | |
72 | * The subsection migrates as much of the levels[] array as is needed | |
73 | * (including repeating the first 16 elements), to avoid the awkwardness | |
74 | * of splitting it in two to meet the requirements of VMSTATE_VARRAY_UINT16. | |
75 | */ | |
76 | #define OLD_MAX_OR_LINES 16 | |
77 | #if MAX_OR_LINES < OLD_MAX_OR_LINES | |
78 | #error MAX_OR_LINES must be at least 16 for migration compatibility | |
79 | #endif | |
80 | ||
81 | static bool vmstate_extras_needed(void *opaque) | |
82 | { | |
83 | qemu_or_irq *s = OR_IRQ(opaque); | |
84 | ||
85 | return s->num_lines >= OLD_MAX_OR_LINES; | |
86 | } | |
87 | ||
88 | static const VMStateDescription vmstate_or_irq_extras = { | |
89 | .name = "or-irq-extras", | |
90 | .version_id = 1, | |
91 | .minimum_version_id = 1, | |
92 | .needed = vmstate_extras_needed, | |
93 | .fields = (VMStateField[]) { | |
94 | VMSTATE_VARRAY_UINT16_UNSAFE(levels, qemu_or_irq, num_lines, 0, | |
95 | vmstate_info_bool, bool), | |
96 | VMSTATE_END_OF_LIST(), | |
97 | }, | |
98 | }; | |
99 | ||
1b255677 AF |
100 | static const VMStateDescription vmstate_or_irq = { |
101 | .name = TYPE_OR_IRQ, | |
102 | .version_id = 1, | |
103 | .minimum_version_id = 1, | |
104 | .fields = (VMStateField[]) { | |
f81804a5 | 105 | VMSTATE_BOOL_SUB_ARRAY(levels, qemu_or_irq, 0, OLD_MAX_OR_LINES), |
1b255677 | 106 | VMSTATE_END_OF_LIST(), |
f81804a5 PM |
107 | }, |
108 | .subsections = (const VMStateDescription*[]) { | |
109 | &vmstate_or_irq_extras, | |
110 | NULL | |
111 | }, | |
1b255677 AF |
112 | }; |
113 | ||
114 | static Property or_irq_properties[] = { | |
115 | DEFINE_PROP_UINT16("num-lines", qemu_or_irq, num_lines, 1), | |
116 | DEFINE_PROP_END_OF_LIST(), | |
117 | }; | |
118 | ||
119 | static void or_irq_class_init(ObjectClass *klass, void *data) | |
120 | { | |
121 | DeviceClass *dc = DEVICE_CLASS(klass); | |
122 | ||
123 | dc->reset = or_irq_reset; | |
124 | dc->props = or_irq_properties; | |
125 | dc->realize = or_irq_realize; | |
126 | dc->vmsd = &vmstate_or_irq; | |
a70716eb TH |
127 | |
128 | /* Reason: Needs to be wired up to work, e.g. see stm32f205_soc.c */ | |
e90f2a8c | 129 | dc->user_creatable = false; |
1b255677 AF |
130 | } |
131 | ||
132 | static const TypeInfo or_irq_type_info = { | |
133 | .name = TYPE_OR_IRQ, | |
134 | .parent = TYPE_DEVICE, | |
135 | .instance_size = sizeof(qemu_or_irq), | |
136 | .instance_init = or_irq_init, | |
137 | .class_init = or_irq_class_init, | |
138 | }; | |
139 | ||
140 | static void or_irq_register_types(void) | |
141 | { | |
142 | type_register_static(&or_irq_type_info); | |
143 | } | |
144 | ||
145 | type_init(or_irq_register_types) |