1 | /* |
2 | * ARM IoTKit system information block |
3 | * |
4 | * Copyright (c) 2018 Linaro Limited |
5 | * Written by Peter Maydell |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify |
8 | * it under the terms of the GNU General Public License version 2 or |
9 | * (at your option) any later version. |
10 | */ |
11 | |
12 | /* |
13 | * This is a model of the "system information block" which is part of the |
14 | * Arm IoTKit and documented in |
15 | * http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ecm0601256/index.html |
16 | * It consists of 2 read-only version/config registers, plus the |
17 | * usual ID registers. |
18 | */ |
19 | |
20 | #include "qemu/osdep.h" |
21 | #include "qemu/log.h" |
22 | #include "qemu/module.h" |
23 | #include "trace.h" |
24 | #include "qapi/error.h" |
25 | #include "hw/sysbus.h" |
26 | #include "hw/registerfields.h" |
27 | #include "hw/misc/iotkit-sysinfo.h" |
28 | #include "hw/qdev-properties.h" |
29 | |
30 | REG32(SYS_VERSION, 0x0) |
31 | REG32(SYS_CONFIG, 0x4) |
32 | REG32(PID4, 0xfd0) |
33 | REG32(PID5, 0xfd4) |
34 | REG32(PID6, 0xfd8) |
35 | REG32(PID7, 0xfdc) |
36 | REG32(PID0, 0xfe0) |
37 | REG32(PID1, 0xfe4) |
38 | REG32(PID2, 0xfe8) |
39 | REG32(PID3, 0xfec) |
40 | REG32(CID0, 0xff0) |
41 | REG32(CID1, 0xff4) |
42 | REG32(CID2, 0xff8) |
43 | REG32(CID3, 0xffc) |
44 | |
45 | /* PID/CID values */ |
46 | static const int sysinfo_id[] = { |
47 | 0x04, 0x00, 0x00, 0x00, /* PID4..PID7 */ |
48 | 0x58, 0xb8, 0x0b, 0x00, /* PID0..PID3 */ |
49 | 0x0d, 0xf0, 0x05, 0xb1, /* CID0..CID3 */ |
50 | }; |
51 | |
52 | static uint64_t iotkit_sysinfo_read(void *opaque, hwaddr offset, |
53 | unsigned size) |
54 | { |
55 | IoTKitSysInfo *s = IOTKIT_SYSINFO(opaque); |
56 | uint64_t r; |
57 | |
58 | switch (offset) { |
59 | case A_SYS_VERSION: |
60 | r = s->sys_version; |
61 | break; |
62 | |
63 | case A_SYS_CONFIG: |
64 | r = s->sys_config; |
65 | break; |
66 | case A_PID4 ... A_CID3: |
67 | r = sysinfo_id[(offset - A_PID4) / 4]; |
68 | break; |
69 | default: |
70 | qemu_log_mask(LOG_GUEST_ERROR, |
71 | "IoTKit SysInfo read: bad offset %x\n" , (int)offset); |
72 | r = 0; |
73 | break; |
74 | } |
75 | trace_iotkit_sysinfo_read(offset, r, size); |
76 | return r; |
77 | } |
78 | |
79 | static void iotkit_sysinfo_write(void *opaque, hwaddr offset, |
80 | uint64_t value, unsigned size) |
81 | { |
82 | trace_iotkit_sysinfo_write(offset, value, size); |
83 | |
84 | qemu_log_mask(LOG_GUEST_ERROR, |
85 | "IoTKit SysInfo: write to RO offset 0x%x\n" , (int)offset); |
86 | } |
87 | |
88 | static const MemoryRegionOps iotkit_sysinfo_ops = { |
89 | .read = iotkit_sysinfo_read, |
90 | .write = iotkit_sysinfo_write, |
91 | .endianness = DEVICE_LITTLE_ENDIAN, |
92 | /* byte/halfword accesses are just zero-padded on reads and writes */ |
93 | .impl.min_access_size = 4, |
94 | .impl.max_access_size = 4, |
95 | .valid.min_access_size = 1, |
96 | .valid.max_access_size = 4, |
97 | }; |
98 | |
99 | static Property iotkit_sysinfo_props[] = { |
100 | DEFINE_PROP_UINT32("SYS_VERSION" , IoTKitSysInfo, sys_version, 0), |
101 | DEFINE_PROP_UINT32("SYS_CONFIG" , IoTKitSysInfo, sys_config, 0), |
102 | DEFINE_PROP_END_OF_LIST() |
103 | }; |
104 | |
105 | static void iotkit_sysinfo_init(Object *obj) |
106 | { |
107 | SysBusDevice *sbd = SYS_BUS_DEVICE(obj); |
108 | IoTKitSysInfo *s = IOTKIT_SYSINFO(obj); |
109 | |
110 | memory_region_init_io(&s->iomem, obj, &iotkit_sysinfo_ops, |
111 | s, "iotkit-sysinfo" , 0x1000); |
112 | sysbus_init_mmio(sbd, &s->iomem); |
113 | } |
114 | |
115 | static void iotkit_sysinfo_class_init(ObjectClass *klass, void *data) |
116 | { |
117 | DeviceClass *dc = DEVICE_CLASS(klass); |
118 | |
119 | /* |
120 | * This device has no guest-modifiable state and so it |
121 | * does not need a reset function or VMState. |
122 | */ |
123 | |
124 | dc->props = iotkit_sysinfo_props; |
125 | } |
126 | |
127 | static const TypeInfo iotkit_sysinfo_info = { |
128 | .name = TYPE_IOTKIT_SYSINFO, |
129 | .parent = TYPE_SYS_BUS_DEVICE, |
130 | .instance_size = sizeof(IoTKitSysInfo), |
131 | .instance_init = iotkit_sysinfo_init, |
132 | .class_init = iotkit_sysinfo_class_init, |
133 | }; |
134 | |
135 | static void iotkit_sysinfo_register_types(void) |
136 | { |
137 | type_register_static(&iotkit_sysinfo_info); |
138 | } |
139 | |
140 | type_init(iotkit_sysinfo_register_types); |
141 | |