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(PID4, 0xfd0)
  34 REG32(PID5, 0xfd4)
  35 REG32(PID6, 0xfd8)
  36 REG32(PID7, 0xfdc)
  37 REG32(PID0, 0xfe0)
  38 REG32(PID1, 0xfe4)
  39 REG32(PID2, 0xfe8)
  40 REG32(PID3, 0xfec)
  41 REG32(CID0, 0xff0)
  42 REG32(CID1, 0xff4)
  43 REG32(CID2, 0xff8)
  44 REG32(CID3, 0xffc)
  45
  46 /* PID/CID values */
  47 static const int sysinfo_id[] = {
  48     0x04, 0x00, 0x00, 0x00, /* PID4..PID7 */
  49     0x58, 0xb8, 0x0b, 0x00, /* PID0..PID3 */
  50     0x0d, 0xf0, 0x05, 0xb1, /* CID0..CID3 */
  51 };
  52
  53 static const int sysinfo_sse300_id[] = {
  54     0x04, 0x00, 0x00, 0x00, /* PID4..PID7 */
  55     0x58, 0xb8, 0x1b, 0x00, /* PID0..PID3 */
  56     0x0d, 0xf0, 0x05, 0xb1, /* CID0..CID3 */
  57 };
  58
  59 static uint64_t iotkit_sysinfo_read(void *opaque, hwaddr offset,
  60                                     unsigned size)
  61 {
  62     IoTKitSysInfo *s = IOTKIT_SYSINFO(opaque);
  63     uint64_t r;
  64
  65     switch (offset) {
  66     case A_SYS_VERSION:
  67         r = s->sys_version;
  68         break;
  69
  70     case A_SYS_CONFIG:
  71         r = s->sys_config;
  72         break;
  73     case A_PID4 ... A_CID3:
  74         switch (s->sse_version) {
  75         case ARMSSE_SSE300:
  76             r = sysinfo_sse300_id[(offset - A_PID4) / 4];
  77             break;
  78         default:
  79             r = sysinfo_id[(offset - A_PID4) / 4];
  80             break;
  81         }
  82         break;
  83     default:
  84         qemu_log_mask(LOG_GUEST_ERROR,
  85                       "IoTKit SysInfo read: bad offset %x\n", (int)offset);
  86         r = 0;
  87         break;
  88     }
  89     trace_iotkit_sysinfo_read(offset, r, size);
  90     return r;
  91 }
  92
  93 static void iotkit_sysinfo_write(void *opaque, hwaddr offset,
  94                                  uint64_t value, unsigned size)
  95 {
  96     trace_iotkit_sysinfo_write(offset, value, size);
  97
  98     qemu_log_mask(LOG_GUEST_ERROR,
  99                   "IoTKit SysInfo: write to RO offset 0x%x\n", (int)offset);
 100 }
 101
 102 static const MemoryRegionOps iotkit_sysinfo_ops = {
 103     .read = iotkit_sysinfo_read,
 104     .write = iotkit_sysinfo_write,
 105     .endianness = DEVICE_LITTLE_ENDIAN,
 106     /* byte/halfword accesses are just zero-padded on reads and writes */
 107     .impl.min_access_size = 4,
 108     .impl.max_access_size = 4,
 109     .valid.min_access_size = 1,
 110     .valid.max_access_size = 4,
 111 };
 112
 113 static Property iotkit_sysinfo_props[] = {
 114     DEFINE_PROP_UINT32("SYS_VERSION", IoTKitSysInfo, sys_version, 0),
 115     DEFINE_PROP_UINT32("SYS_CONFIG", IoTKitSysInfo, sys_config, 0),
 116     DEFINE_PROP_UINT32("sse-version", IoTKitSysInfo, sse_version, 0),
 117     DEFINE_PROP_END_OF_LIST()
 118 };
 119
 120 static void iotkit_sysinfo_init(Object *obj)
 121 {
 122     SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
 123     IoTKitSysInfo *s = IOTKIT_SYSINFO(obj);
 124
 125     memory_region_init_io(&s->iomem, obj, &iotkit_sysinfo_ops,
 126                           s, "iotkit-sysinfo", 0x1000);
 127     sysbus_init_mmio(sbd, &s->iomem);
 128 }
 129
 130 static void iotkit_sysinfo_realize(DeviceState *dev, Error **errp)
 131 {
 132     IoTKitSysInfo *s = IOTKIT_SYSINFO(dev);
 133
 134     if (!armsse_version_valid(s->sse_version)) {
 135         error_setg(errp, "invalid sse-version value %d", s->sse_version);
 136         return;
 137     }
 138 }
 139
 140 static void iotkit_sysinfo_class_init(ObjectClass *klass, void *data)
 141 {
 142     DeviceClass *dc = DEVICE_CLASS(klass);
 143
 144     /*
 145      * This device has no guest-modifiable state and so it
 146      * does not need a reset function or VMState.
 147      */
 148     dc->realize = iotkit_sysinfo_realize;
 149     device_class_set_props(dc, iotkit_sysinfo_props);
 150 }
 151
 152 static const TypeInfo iotkit_sysinfo_info = {
 153     .name = TYPE_IOTKIT_SYSINFO,
 154     .parent = TYPE_SYS_BUS_DEVICE,
 155     .instance_size = sizeof(IoTKitSysInfo),
 156     .instance_init = iotkit_sysinfo_init,
 157     .class_init = iotkit_sysinfo_class_init,
 158 };
 159
 160 static void iotkit_sysinfo_register_types(void)
 161 {
 162     type_register_static(&iotkit_sysinfo_info);
 163 }
 164
 165 type_init(iotkit_sysinfo_register_types);