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 "trace.h"
  23 #include "qapi/error.h"
  24 #include "sysemu/sysemu.h"
  25 #include "hw/sysbus.h"
  26 #include "hw/registerfields.h"
  27 #include "hw/misc/iotkit-sysinfo.h"
  28
  29 REG32(SYS_VERSION, 0x0)
  30 REG32(SYS_CONFIG, 0x4)
  31 REG32(PID4, 0xfd0)
  32 REG32(PID5, 0xfd4)
  33 REG32(PID6, 0xfd8)
  34 REG32(PID7, 0xfdc)
  35 REG32(PID0, 0xfe0)
  36 REG32(PID1, 0xfe4)
  37 REG32(PID2, 0xfe8)
  38 REG32(PID3, 0xfec)
  39 REG32(CID0, 0xff0)
  40 REG32(CID1, 0xff4)
  41 REG32(CID2, 0xff8)
  42 REG32(CID3, 0xffc)
  43
  44 /* PID/CID values */
  45 static const int sysinfo_id[] = {
  46     0x04, 0x00, 0x00, 0x00, /* PID4..PID7 */
  47     0x58, 0xb8, 0x0b, 0x00, /* PID0..PID3 */
  48     0x0d, 0xf0, 0x05, 0xb1, /* CID0..CID3 */
  49 };
  50
  51 static uint64_t iotkit_sysinfo_read(void *opaque, hwaddr offset,
  52                                     unsigned size)
  53 {
  54     uint64_t r;
  55
  56     switch (offset) {
  57     case A_SYS_VERSION:
  58         r = 0x41743;
  59         break;
  60
  61     case A_SYS_CONFIG:
  62         r = 0x31;
  63         break;
  64     case A_PID4 ... A_CID3:
  65         r = sysinfo_id[(offset - A_PID4) / 4];
  66         break;
  67     default:
  68         qemu_log_mask(LOG_GUEST_ERROR,
  69                       "IoTKit SysInfo read: bad offset %x\n", (int)offset);
  70         r = 0;
  71         break;
  72     }
  73     trace_iotkit_sysinfo_read(offset, r, size);
  74     return r;
  75 }
  76
  77 static void iotkit_sysinfo_write(void *opaque, hwaddr offset,
  78                                  uint64_t value, unsigned size)
  79 {
  80     trace_iotkit_sysinfo_write(offset, value, size);
  81
  82     qemu_log_mask(LOG_GUEST_ERROR,
  83                   "IoTKit SysInfo: write to RO offset 0x%x\n", (int)offset);
  84 }
  85
  86 static const MemoryRegionOps iotkit_sysinfo_ops = {
  87     .read = iotkit_sysinfo_read,
  88     .write = iotkit_sysinfo_write,
  89     .endianness = DEVICE_LITTLE_ENDIAN,
  90     /* byte/halfword accesses are just zero-padded on reads and writes */
  91     .impl.min_access_size = 4,
  92     .impl.max_access_size = 4,
  93     .valid.min_access_size = 1,
  94     .valid.max_access_size = 4,
  95 };
  96
  97 static void iotkit_sysinfo_init(Object *obj)
  98 {
  99     SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
 100     IoTKitSysInfo *s = IOTKIT_SYSINFO(obj);
 101
 102     memory_region_init_io(&s->iomem, obj, &iotkit_sysinfo_ops,
 103                           s, "iotkit-sysinfo", 0x1000);
 104     sysbus_init_mmio(sbd, &s->iomem);
 105 }
 106
 107 static void iotkit_sysinfo_class_init(ObjectClass *klass, void *data)
 108 {
 109     /*
 110      * This device has no guest-modifiable state and so it
 111      * does not need a reset function or VMState.
 112      */
 113 }
 114
 115 static const TypeInfo iotkit_sysinfo_info = {
 116     .name = TYPE_IOTKIT_SYSINFO,
 117     .parent = TYPE_SYS_BUS_DEVICE,
 118     .instance_size = sizeof(IoTKitSysInfo),
 119     .instance_init = iotkit_sysinfo_init,
 120     .class_init = iotkit_sysinfo_class_init,
 121 };
 122
 123 static void iotkit_sysinfo_register_types(void)
 124 {
 125     type_register_static(&iotkit_sysinfo_info);
 126 }
 127
 128 type_init(iotkit_sysinfo_register_types);