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
  30 REG32(SYS_VERSION, 0x0)
  31 REG32(SYS_CONFIG, 0x4)
  32 REG32(PID4, 0xfd0)
  33 REG32(PID5, 0xfd4)
  34 REG32(PID6, 0xfd8)
  35 REG32(PID7, 0xfdc)
  36 REG32(PID0, 0xfe0)
  37 REG32(PID1, 0xfe4)
  38 REG32(PID2, 0xfe8)
  39 REG32(PID3, 0xfec)
  40 REG32(CID0, 0xff0)
  41 REG32(CID1, 0xff4)
  42 REG32(CID2, 0xff8)
  43 REG32(CID3, 0xffc)
  44
  45 /* PID/CID values */
  46 static const int sysinfo_id[] = {
  47     0x04, 0x00, 0x00, 0x00, /* PID4..PID7 */
  48     0x58, 0xb8, 0x0b, 0x00, /* PID0..PID3 */
  49     0x0d, 0xf0, 0x05, 0xb1, /* CID0..CID3 */
  50 };
  51
  52 static uint64_t iotkit_sysinfo_read(void *opaque, hwaddr offset,
  53                                     unsigned size)
  54 {
  55     IoTKitSysInfo *s = IOTKIT_SYSINFO(opaque);
  56     uint64_t r;
  57
  58     switch (offset) {
  59     case A_SYS_VERSION:
  60         r = s->sys_version;
  61         break;
  62
  63     case A_SYS_CONFIG:
  64         r = s->sys_config;
  65         break;
  66     case A_PID4 ... A_CID3:
  67         r = sysinfo_id[(offset - A_PID4) / 4];
  68         break;
  69     default:
  70         qemu_log_mask(LOG_GUEST_ERROR,
  71                       "IoTKit SysInfo read: bad offset %x\n", (int)offset);
  72         r = 0;
  73         break;
  74     }
  75     trace_iotkit_sysinfo_read(offset, r, size);
  76     return r;
  77 }
  78
  79 static void iotkit_sysinfo_write(void *opaque, hwaddr offset,
  80                                  uint64_t value, unsigned size)
  81 {
  82     trace_iotkit_sysinfo_write(offset, value, size);
  83
  84     qemu_log_mask(LOG_GUEST_ERROR,
  85                   "IoTKit SysInfo: write to RO offset 0x%x\n", (int)offset);
  86 }
  87
  88 static const MemoryRegionOps iotkit_sysinfo_ops = {
  89     .read = iotkit_sysinfo_read,
  90     .write = iotkit_sysinfo_write,
  91     .endianness = DEVICE_LITTLE_ENDIAN,
  92     /* byte/halfword accesses are just zero-padded on reads and writes */
  93     .impl.min_access_size = 4,
  94     .impl.max_access_size = 4,
  95     .valid.min_access_size = 1,
  96     .valid.max_access_size = 4,
  97 };
  98
  99 static Property iotkit_sysinfo_props[] = {
 100     DEFINE_PROP_UINT32("SYS_VERSION", IoTKitSysInfo, sys_version, 0),
 101     DEFINE_PROP_UINT32("SYS_CONFIG", IoTKitSysInfo, sys_config, 0),
 102     DEFINE_PROP_END_OF_LIST()
 103 };
 104
 105 static void iotkit_sysinfo_init(Object *obj)
 106 {
 107     SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
 108     IoTKitSysInfo *s = IOTKIT_SYSINFO(obj);
 109
 110     memory_region_init_io(&s->iomem, obj, &iotkit_sysinfo_ops,
 111                           s, "iotkit-sysinfo", 0x1000);
 112     sysbus_init_mmio(sbd, &s->iomem);
 113 }
 114
 115 static void iotkit_sysinfo_class_init(ObjectClass *klass, void *data)
 116 {
 117     DeviceClass *dc = DEVICE_CLASS(klass);
 118
 119     /*
 120      * This device has no guest-modifiable state and so it
 121      * does not need a reset function or VMState.
 122      */
 123
 124     device_class_set_props(dc, iotkit_sysinfo_props);
 125 }
 126
 127 static const TypeInfo iotkit_sysinfo_info = {
 128     .name = TYPE_IOTKIT_SYSINFO,
 129     .parent = TYPE_SYS_BUS_DEVICE,
 130     .instance_size = sizeof(IoTKitSysInfo),
 131     .instance_init = iotkit_sysinfo_init,
 132     .class_init = iotkit_sysinfo_class_init,
 133 };
 134
 135 static void iotkit_sysinfo_register_types(void)
 136 {
 137     type_register_static(&iotkit_sysinfo_info);
 138 }
 139
 140 type_init(iotkit_sysinfo_register_types);