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 * 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
20 #include "qemu/osdep.h"
23 #include "qapi/error.h"
24 #include "sysemu/sysemu.h"
25 #include "hw/sysbus.h"
26 #include "hw/registerfields.h"
27 #include "hw/misc/iotkit-sysinfo.h"
29 REG32(SYS_VERSION, 0x0)
30 REG32(SYS_CONFIG, 0x4)
45 static const int sysinfo_id[] = {
46 0x04, 0x00, 0x00, 0x00, /* PID4..PID7 */
47 0x58, 0xb8, 0x0b, 0x00, /* PID0..PID3 */
48 0x0d, 0xf0, 0x05, 0xb1, /* CID0..CID3 */
51 static uint64_t iotkit_sysinfo_read(void *opaque, hwaddr offset,
64 case A_PID4 ... A_CID3:
65 r = sysinfo_id[(offset - A_PID4) / 4];
68 qemu_log_mask(LOG_GUEST_ERROR,
69 "IoTKit SysInfo read: bad offset %x\n", (int)offset);
73 trace_iotkit_sysinfo_read(offset, r, size);
77 static void iotkit_sysinfo_write(void *opaque, hwaddr offset,
78 uint64_t value, unsigned size)
80 trace_iotkit_sysinfo_write(offset, value, size);
82 qemu_log_mask(LOG_GUEST_ERROR,
83 "IoTKit SysInfo: write to RO offset 0x%x\n", (int)offset);
86 static const MemoryRegionOps iotkit_sysinfo_ops = {
87 .read = iotkit_sysinfo_read,
88 .write = iotkit_sysinfo_write,
89 .endianness = DEVICE_LITTLE_ENDIAN,
90 /* byte/halfword accesses are just zero-padded on reads and writes */
91 .impl.min_access_size = 4,
92 .impl.max_access_size = 4,
93 .valid.min_access_size = 1,
94 .valid.max_access_size = 4,
97 static void iotkit_sysinfo_init(Object *obj)
99 SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
100 IoTKitSysInfo *s = IOTKIT_SYSINFO(obj);
102 memory_region_init_io(&s->iomem, obj, &iotkit_sysinfo_ops,
103 s, "iotkit-sysinfo", 0x1000);
104 sysbus_init_mmio(sbd, &s->iomem);
107 static void iotkit_sysinfo_class_init(ObjectClass *klass, void *data)
110 * This device has no guest-modifiable state and so it
111 * does not need a reset function or VMState.
115 static const TypeInfo iotkit_sysinfo_info = {
116 .name = TYPE_IOTKIT_SYSINFO,
117 .parent = TYPE_SYS_BUS_DEVICE,
118 .instance_size = sizeof(IoTKitSysInfo),
119 .instance_init = iotkit_sysinfo_init,
120 .class_init = iotkit_sysinfo_class_init,
123 static void iotkit_sysinfo_register_types(void)
125 type_register_static(&iotkit_sysinfo_info);
128 type_init(iotkit_sysinfo_register_types);