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
  31 REG32(SYS_VERSION, 0x0)
  32 REG32(SYS_CONFIG, 0x4)
  33 REG32(SYS_CONFIG1, 0x8)
  34 REG32(IIDR, 0xfc8)
  35 REG32(PID4, 0xfd0)
  36 REG32(PID5, 0xfd4)
  37 REG32(PID6, 0xfd8)
  38 REG32(PID7, 0xfdc)
  39 REG32(PID0, 0xfe0)
  40 REG32(PID1, 0xfe4)
  41 REG32(PID2, 0xfe8)
  42 REG32(PID3, 0xfec)
  43 REG32(CID0, 0xff0)
  44 REG32(CID1, 0xff4)
  45 REG32(CID2, 0xff8)
  46 REG32(CID3, 0xffc)
  47
  48 /* PID/CID values */
  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 */
  53 };
  54
  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 */
  59 };
  60
  61 static 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
 114 static 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
 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,
 132 };
 133
 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()
 140 };
 141
 142 static 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
 152 static 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
 162 static 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
 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,
 180 };
 181
 182 static void iotkit_sysinfo_register_types(void)
 183 {
 184     type_register_static(&iotkit_sysinfo_info);
 185 }
 186
 187 type_init(iotkit_sysinfo_register_types);