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 * 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 "hw/sysbus.h"
  26#include "hw/registerfields.h"
  27#include "hw/misc/iotkit-sysinfo.h"
  28#include "hw/qdev-properties.h"
  29
  30REG32(SYS_VERSION, 0x0)
  31REG32(SYS_CONFIG, 0x4)
  32REG32(PID4, 0xfd0)
  33REG32(PID5, 0xfd4)
  34REG32(PID6, 0xfd8)
  35REG32(PID7, 0xfdc)
  36REG32(PID0, 0xfe0)
  37REG32(PID1, 0xfe4)
  38REG32(PID2, 0xfe8)
  39REG32(PID3, 0xfec)
  40REG32(CID0, 0xff0)
  41REG32(CID1, 0xff4)
  42REG32(CID2, 0xff8)
  43REG32(CID3, 0xffc)
  44
  45/* PID/CID values */
  46static 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
  52static 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
  79static 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
  88static 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
  99static 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
 105static 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
 115static 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
 127static 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
 135static void iotkit_sysinfo_register_types(void)
 136{
 137    type_register_static(&iotkit_sysinfo_info);
 138}
 139
 140type_init(iotkit_sysinfo_register_types);
 141