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  * 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
  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 "sysemu/sysemu.h"
  26 #include "hw/sysbus.h"
  27 #include "hw/registerfields.h"
  28 #include "hw/misc/iotkit-sysinfo.h"
  29 #include "hw/qdev-properties.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 uint64_t iotkit_sysinfo_read(void *opaque, hwaddr offset,
  54                                     unsigned size)
  55 {
  56     IoTKitSysInfo *s = IOTKIT_SYSINFO(opaque);
  57     uint64_t r;
  58
  59     switch (offset) {
  60     case A_SYS_VERSION:
  61         r = s->sys_version;
  62         break;
  63
  64     case A_SYS_CONFIG:
  65         r = s->sys_config;
  66         break;
  67     case A_PID4 ... A_CID3:
  68         r = sysinfo_id[(offset - A_PID4) / 4];
  69         break;
  70     default:
  71         qemu_log_mask(LOG_GUEST_ERROR,
  72                       "IoTKit SysInfo read: bad offset %x\n", (int)offset);
  73         r = 0;
  74         break;
  75     }
  76     trace_iotkit_sysinfo_read(offset, r, size);
  77     return r;
  78 }
  79
  80 static void iotkit_sysinfo_write(void *opaque, hwaddr offset,
  81                                  uint64_t value, unsigned size)
  82 {
  83     trace_iotkit_sysinfo_write(offset, value, size);
  84
  85     qemu_log_mask(LOG_GUEST_ERROR,
  86                   "IoTKit SysInfo: write to RO offset 0x%x\n", (int)offset);
  87 }
  88
  89 static const MemoryRegionOps iotkit_sysinfo_ops = {
  90     .read = iotkit_sysinfo_read,
  91     .write = iotkit_sysinfo_write,
  92     .endianness = DEVICE_LITTLE_ENDIAN,
  93     /* byte/halfword accesses are just zero-padded on reads and writes */
  94     .impl.min_access_size = 4,
  95     .impl.max_access_size = 4,
  96     .valid.min_access_size = 1,
  97     .valid.max_access_size = 4,
  98 };
  99
 100 static Property iotkit_sysinfo_props[] = {
 101     DEFINE_PROP_UINT32("SYS_VERSION", IoTKitSysInfo, sys_version, 0),
 102     DEFINE_PROP_UINT32("SYS_CONFIG", IoTKitSysInfo, sys_config, 0),
 103     DEFINE_PROP_END_OF_LIST()
 104 };
 105
 106 static void iotkit_sysinfo_init(Object *obj)
 107 {
 108     SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
 109     IoTKitSysInfo *s = IOTKIT_SYSINFO(obj);
 110
 111     memory_region_init_io(&s->iomem, obj, &iotkit_sysinfo_ops,
 112                           s, "iotkit-sysinfo", 0x1000);
 113     sysbus_init_mmio(sbd, &s->iomem);
 114 }
 115
 116 static void iotkit_sysinfo_class_init(ObjectClass *klass, void *data)
 117 {
 118     DeviceClass *dc = DEVICE_CLASS(klass);
 119
 120     /*
 121      * This device has no guest-modifiable state and so it
 122      * does not need a reset function or VMState.
 123      */
 124
 125     dc->props = iotkit_sysinfo_props;
 126 }
 127
 128 static const TypeInfo iotkit_sysinfo_info = {
 129     .name = TYPE_IOTKIT_SYSINFO,
 130     .parent = TYPE_SYS_BUS_DEVICE,
 131     .instance_size = sizeof(IoTKitSysInfo),
 132     .instance_init = iotkit_sysinfo_init,
 133     .class_init = iotkit_sysinfo_class_init,
 134 };
 135
 136 static void iotkit_sysinfo_register_types(void)
 137 {
 138     type_register_static(&iotkit_sysinfo_info);
 139 }
 140
 141 type_init(iotkit_sysinfo_register_types);