2 * ARM IoTKit system information block
4 * Copyright (c) 2018 Linaro Limited
5 * Written by Peter Maydell
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.
13 * This is a model of the "system information block" which is part of the
14 * Arm IoTKit and documented in
15 * https://developer.arm.com/documentation/ecm0601256/latest
16 * It consists of 2 read-only version/config registers, plus the
20 #include "qemu/osdep.h"
22 #include "qemu/module.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 #include "hw/arm/armsse-version.h"
31 REG32(SYS_VERSION, 0x0)
32 REG32(SYS_CONFIG, 0x4)
33 REG32(SYS_CONFIG1, 0x8)
49 static const int sysinfo_id[] = {
50 0x04, 0x00, 0x00, 0x00, /* PID4..PID7 */
51 0x58, 0xb8, 0x0b, 0x00, /* PID0..PID3 */
52 0x0d, 0xf0, 0x05, 0xb1, /* CID0..CID3 */
55 static const int sysinfo_sse300_id[] = {
56 0x04, 0x00, 0x00, 0x00, /* PID4..PID7 */
57 0x58, 0xb8, 0x1b, 0x00, /* PID0..PID3 */
58 0x0d, 0xf0, 0x05, 0xb1, /* CID0..CID3 */
61 static uint64_t iotkit_sysinfo_read(void *opaque, hwaddr offset,
64 IoTKitSysInfo *s = IOTKIT_SYSINFO(opaque);
76 switch (s->sse_version) {
85 switch (s->sse_version) {
93 case A_PID4 ... A_CID3:
94 switch (s->sse_version) {
96 r = sysinfo_sse300_id[(offset - A_PID4) / 4];
99 r = sysinfo_id[(offset - A_PID4) / 4];
105 qemu_log_mask(LOG_GUEST_ERROR,
106 "IoTKit SysInfo read: bad offset %x\n", (int)offset);
110 trace_iotkit_sysinfo_read(offset, r, size);
114 static void iotkit_sysinfo_write(void *opaque, hwaddr offset,
115 uint64_t value, unsigned size)
117 trace_iotkit_sysinfo_write(offset, value, size);
119 qemu_log_mask(LOG_GUEST_ERROR,
120 "IoTKit SysInfo: write to RO offset 0x%x\n", (int)offset);
123 static const MemoryRegionOps iotkit_sysinfo_ops = {
124 .read = iotkit_sysinfo_read,
125 .write = iotkit_sysinfo_write,
126 .endianness = DEVICE_LITTLE_ENDIAN,
127 /* byte/halfword accesses are just zero-padded on reads and writes */
128 .impl.min_access_size = 4,
129 .impl.max_access_size = 4,
130 .valid.min_access_size = 1,
131 .valid.max_access_size = 4,
134 static Property iotkit_sysinfo_props[] = {
135 DEFINE_PROP_UINT32("SYS_VERSION", IoTKitSysInfo, sys_version, 0),
136 DEFINE_PROP_UINT32("SYS_CONFIG", IoTKitSysInfo, sys_config, 0),
137 DEFINE_PROP_UINT32("sse-version", IoTKitSysInfo, sse_version, 0),
138 DEFINE_PROP_UINT32("IIDR", IoTKitSysInfo, iidr, 0),
139 DEFINE_PROP_END_OF_LIST()
142 static void iotkit_sysinfo_init(Object *obj)
144 SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
145 IoTKitSysInfo *s = IOTKIT_SYSINFO(obj);
147 memory_region_init_io(&s->iomem, obj, &iotkit_sysinfo_ops,
148 s, "iotkit-sysinfo", 0x1000);
149 sysbus_init_mmio(sbd, &s->iomem);
152 static void iotkit_sysinfo_realize(DeviceState *dev, Error **errp)
154 IoTKitSysInfo *s = IOTKIT_SYSINFO(dev);
156 if (!armsse_version_valid(s->sse_version)) {
157 error_setg(errp, "invalid sse-version value %d", s->sse_version);
162 static void iotkit_sysinfo_class_init(ObjectClass *klass, void *data)
164 DeviceClass *dc = DEVICE_CLASS(klass);
167 * This device has no guest-modifiable state and so it
168 * does not need a reset function or VMState.
170 dc->realize = iotkit_sysinfo_realize;
171 device_class_set_props(dc, iotkit_sysinfo_props);
174 static const TypeInfo iotkit_sysinfo_info = {
175 .name = TYPE_IOTKIT_SYSINFO,
176 .parent = TYPE_SYS_BUS_DEVICE,
177 .instance_size = sizeof(IoTKitSysInfo),
178 .instance_init = iotkit_sysinfo_init,
179 .class_init = iotkit_sysinfo_class_init,
182 static void iotkit_sysinfo_register_types(void)
184 type_register_static(&iotkit_sysinfo_info);
187 type_init(iotkit_sysinfo_register_types);