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); 142