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1 | /* |
2 | * QEMU Macintosh Nubus | |
3 | * | |
4 | * Copyright (c) 2013-2018 Laurent Vivier <laurent@vivier.eu> | |
5 | * | |
6 | * This work is licensed under the terms of the GNU GPL, version 2 or later. | |
7 | * See the COPYING file in the top-level directory. | |
8 | * | |
9 | */ | |
10 | ||
11 | #include "qemu/osdep.h" | |
12 | #include "hw/nubus/nubus.h" | |
13 | #include "hw/sysbus.h" | |
14 | #include "qapi/error.h" | |
15 | ||
16 | ||
17 | static NubusBus *nubus_find(void) | |
18 | { | |
19 | /* Returns NULL unless there is exactly one nubus device */ | |
20 | return NUBUS_BUS(object_resolve_path_type("", TYPE_NUBUS_BUS, NULL)); | |
21 | } | |
22 | ||
23 | static void nubus_slot_write(void *opaque, hwaddr addr, uint64_t val, | |
24 | unsigned int size) | |
25 | { | |
26 | /* read only */ | |
27 | } | |
28 | ||
29 | ||
30 | static uint64_t nubus_slot_read(void *opaque, hwaddr addr, | |
31 | unsigned int size) | |
32 | { | |
33 | return 0; | |
34 | } | |
35 | ||
36 | static const MemoryRegionOps nubus_slot_ops = { | |
37 | .read = nubus_slot_read, | |
38 | .write = nubus_slot_write, | |
39 | .endianness = DEVICE_BIG_ENDIAN, | |
40 | .valid = { | |
41 | .min_access_size = 1, | |
42 | .max_access_size = 1, | |
43 | }, | |
44 | }; | |
45 | ||
46 | static void nubus_super_slot_write(void *opaque, hwaddr addr, uint64_t val, | |
47 | unsigned int size) | |
48 | { | |
49 | /* read only */ | |
50 | } | |
51 | ||
52 | static uint64_t nubus_super_slot_read(void *opaque, hwaddr addr, | |
53 | unsigned int size) | |
54 | { | |
55 | return 0; | |
56 | } | |
57 | ||
58 | static const MemoryRegionOps nubus_super_slot_ops = { | |
59 | .read = nubus_super_slot_read, | |
60 | .write = nubus_super_slot_write, | |
61 | .endianness = DEVICE_BIG_ENDIAN, | |
62 | .valid = { | |
63 | .min_access_size = 1, | |
64 | .max_access_size = 1, | |
65 | }, | |
66 | }; | |
67 | ||
68 | static void nubus_realize(BusState *bus, Error **errp) | |
69 | { | |
70 | if (!nubus_find()) { | |
71 | error_setg(errp, "at most one %s device is permitted", TYPE_NUBUS_BUS); | |
72 | return; | |
73 | } | |
74 | } | |
75 | ||
76 | static void nubus_init(Object *obj) | |
77 | { | |
78 | NubusBus *nubus = NUBUS_BUS(obj); | |
79 | ||
80 | memory_region_init_io(&nubus->super_slot_io, obj, &nubus_super_slot_ops, | |
81 | nubus, "nubus-super-slots", | |
82 | NUBUS_SUPER_SLOT_NB * NUBUS_SUPER_SLOT_SIZE); | |
83 | ||
84 | memory_region_init_io(&nubus->slot_io, obj, &nubus_slot_ops, | |
85 | nubus, "nubus-slots", | |
86 | NUBUS_SLOT_NB * NUBUS_SLOT_SIZE); | |
87 | ||
88 | nubus->current_slot = NUBUS_FIRST_SLOT; | |
89 | } | |
90 | ||
91 | static void nubus_class_init(ObjectClass *oc, void *data) | |
92 | { | |
93 | BusClass *bc = BUS_CLASS(oc); | |
94 | ||
95 | bc->realize = nubus_realize; | |
96 | } | |
97 | ||
98 | static const TypeInfo nubus_bus_info = { | |
99 | .name = TYPE_NUBUS_BUS, | |
100 | .parent = TYPE_BUS, | |
101 | .instance_size = sizeof(NubusBus), | |
102 | .instance_init = nubus_init, | |
103 | .class_init = nubus_class_init, | |
104 | }; | |
105 | ||
106 | static void nubus_register_types(void) | |
107 | { | |
108 | type_register_static(&nubus_bus_info); | |
109 | } | |
110 | ||
111 | type_init(nubus_register_types) |