LXR qemu/hw/misc/iotkit-sysinfo.c

   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 * https://developer.arm.com/documentation/ecm0601256/latest
  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#include "hw/arm/armsse-version.h"
  30
  31REG32(SYS_VERSION, 0x0)
  32REG32(SYS_CONFIG, 0x4)
  33REG32(SYS_CONFIG1, 0x8)
  34REG32(IIDR, 0xfc8)
  35REG32(PID4, 0xfd0)
  36REG32(PID5, 0xfd4)
  37REG32(PID6, 0xfd8)
  38REG32(PID7, 0xfdc)
  39REG32(PID0, 0xfe0)
  40REG32(PID1, 0xfe4)
  41REG32(PID2, 0xfe8)
  42REG32(PID3, 0xfec)
  43REG32(CID0, 0xff0)
  44REG32(CID1, 0xff4)
  45REG32(CID2, 0xff8)
  46REG32(CID3, 0xffc)
  47
  48/* PID/CID values */
  49static 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 */
  53};
  54
  55static 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 */
  59};
  60
  61static uint64_t iotkit_sysinfo_read(void *opaque, hwaddr offset,
  62                                    unsigned size)
  63{
  64    IoTKitSysInfo *s = IOTKIT_SYSINFO(opaque);
  65    uint64_t r;
  66
  67    switch (offset) {
  68    case A_SYS_VERSION:
  69        r = s->sys_version;
  70        break;
  71
  72    case A_SYS_CONFIG:
  73        r = s->sys_config;
  74        break;
  75    case A_SYS_CONFIG1:
  76        switch (s->sse_version) {
  77        case ARMSSE_SSE300:
  78            return 0;
  79            break;
  80        default:
  81            goto bad_read;
  82        }
  83        break;
  84    case A_IIDR:
  85        switch (s->sse_version) {
  86        case ARMSSE_SSE300:
  87            return s->iidr;
  88            break;
  89        default:
  90            goto bad_read;
  91        }
  92        break;
  93    case A_PID4 ... A_CID3:
  94        switch (s->sse_version) {
  95        case ARMSSE_SSE300:
  96            r = sysinfo_sse300_id[(offset - A_PID4) / 4];
  97            break;
  98        default:
  99            r = sysinfo_id[(offset - A_PID4) / 4];
 100            break;
 101        }
 102        break;
 103    default:
 104    bad_read:
 105        qemu_log_mask(LOG_GUEST_ERROR,
 106                      "IoTKit SysInfo read: bad offset %x\n", (int)offset);
 107        r = 0;
 108        break;
 109    }
 110    trace_iotkit_sysinfo_read(offset, r, size);
 111    return r;
 112}
 113
 114static void iotkit_sysinfo_write(void *opaque, hwaddr offset,
 115                                 uint64_t value, unsigned size)
 116{
 117    trace_iotkit_sysinfo_write(offset, value, size);
 118
 119    qemu_log_mask(LOG_GUEST_ERROR,
 120                  "IoTKit SysInfo: write to RO offset 0x%x\n", (int)offset);
 121}
 122
 123static 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,
 132};
 133
 134static 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()
 140};
 141
 142static void iotkit_sysinfo_init(Object *obj)
 143{
 144    SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
 145    IoTKitSysInfo *s = IOTKIT_SYSINFO(obj);
 146
 147    memory_region_init_io(&s->iomem, obj, &iotkit_sysinfo_ops,
 148                          s, "iotkit-sysinfo", 0x1000);
 149    sysbus_init_mmio(sbd, &s->iomem);
 150}
 151
 152static void iotkit_sysinfo_realize(DeviceState *dev, Error **errp)
 153{
 154    IoTKitSysInfo *s = IOTKIT_SYSINFO(dev);
 155
 156    if (!armsse_version_valid(s->sse_version)) {
 157        error_setg(errp, "invalid sse-version value %d", s->sse_version);
 158        return;
 159    }
 160}
 161
 162static void iotkit_sysinfo_class_init(ObjectClass *klass, void *data)
 163{
 164    DeviceClass *dc = DEVICE_CLASS(klass);
 165
 166    /*
 167     * This device has no guest-modifiable state and so it
 168     * does not need a reset function or VMState.
 169     */
 170    dc->realize = iotkit_sysinfo_realize;
 171    device_class_set_props(dc, iotkit_sysinfo_props);
 172}
 173
 174static 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,
 180};
 181
 182static void iotkit_sysinfo_register_types(void)
 183{
 184    type_register_static(&iotkit_sysinfo_info);
 185}
 186
 187type_init(iotkit_sysinfo_register_types);
 188