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 #include "hw/arm/armsse-version.h" 30 31 REG32(SYS_VERSION, 0x0) 32 REG32(SYS_CONFIG, 0x4) 33 REG32(SYS_CONFIG1, 0x8) 34 REG32(IIDR, 0xfc8) 35 REG32(PID4, 0xfd0) 36 REG32(PID5, 0xfd4) 37 REG32(PID6, 0xfd8) 38 REG32(PID7, 0xfdc) 39 REG32(PID0, 0xfe0) 40 REG32(PID1, 0xfe4) 41 REG32(PID2, 0xfe8) 42 REG32(PID3, 0xfec) 43 REG32(CID0, 0xff0) 44 REG32(CID1, 0xff4) 45 REG32(CID2, 0xff8) 46 REG32(CID3, 0xffc) 47 48 /* PID/CID values */ 49 static const int sysinfo_id[] = { 50 0x04, 0x00, 0x00, 0x00, /* PID4..PID7 */ 51 0x58, 0xb8, 0x0b, 0x00, /* PID0..PID3 */ 52 0x0d, 0xf0, 0x05, 0xb1, /* CID0..CID3 */ 53 }; 54 55 static const int sysinfo_sse300_id[] = { 56 0x04, 0x00, 0x00, 0x00, /* PID4..PID7 */ 57 0x58, 0xb8, 0x1b, 0x00, /* PID0..PID3 */ 58 0x0d, 0xf0, 0x05, 0xb1, /* CID0..CID3 */ 59 }; 60 61 static uint64_t iotkit_sysinfo_read(void *opaque, hwaddr offset, 62 unsigned size) 63 { 64 IoTKitSysInfo *s = IOTKIT_SYSINFO(opaque); 65 uint64_t r; 66 67 switch (offset) { 68 case A_SYS_VERSION: 69 r = s->sys_version; 70 break; 71 72 case A_SYS_CONFIG: 73 r = s->sys_config; 74 break; 75 case A_SYS_CONFIG1: 76 switch (s->sse_version) { 77 case ARMSSE_SSE300: 78 return 0; 79 break; 80 default: 81 goto bad_read; 82 } 83 break; 84 case A_IIDR: 85 switch (s->sse_version) { 86 case ARMSSE_SSE300: 87 return s->iidr; 88 break; 89 default: 90 goto bad_read; 91 } 92 break; 93 case A_PID4 ... A_CID3: 94 switch (s->sse_version) { 95 case ARMSSE_SSE300: 96 r = sysinfo_sse300_id[(offset - A_PID4) / 4]; 97 break; 98 default: 99 r = sysinfo_id[(offset - A_PID4) / 4]; 100 break; 101 } 102 break; 103 default: 104 bad_read: 105 qemu_log_mask(LOG_GUEST_ERROR, 106 "IoTKit SysInfo read: bad offset %x\n", (int)offset); 107 r = 0; 108 break; 109 } 110 trace_iotkit_sysinfo_read(offset, r, size); 111 return r; 112 } 113 114 static void iotkit_sysinfo_write(void *opaque, hwaddr offset, 115 uint64_t value, unsigned size) 116 { 117 trace_iotkit_sysinfo_write(offset, value, size); 118 119 qemu_log_mask(LOG_GUEST_ERROR, 120 "IoTKit SysInfo: write to RO offset 0x%x\n", (int)offset); 121 } 122 123 static const MemoryRegionOps iotkit_sysinfo_ops = { 124 .read = iotkit_sysinfo_read, 125 .write = iotkit_sysinfo_write, 126 .endianness = DEVICE_LITTLE_ENDIAN, 127 /* byte/halfword accesses are just zero-padded on reads and writes */ 128 .impl.min_access_size = 4, 129 .impl.max_access_size = 4, 130 .valid.min_access_size = 1, 131 .valid.max_access_size = 4, 132 }; 133 134 static Property iotkit_sysinfo_props[] = { 135 DEFINE_PROP_UINT32("SYS_VERSION", IoTKitSysInfo, sys_version, 0), 136 DEFINE_PROP_UINT32("SYS_CONFIG", IoTKitSysInfo, sys_config, 0), 137 DEFINE_PROP_UINT32("sse-version", IoTKitSysInfo, sse_version, 0), 138 DEFINE_PROP_UINT32("IIDR", IoTKitSysInfo, iidr, 0), 139 DEFINE_PROP_END_OF_LIST() 140 }; 141 142 static void iotkit_sysinfo_init(Object *obj) 143 { 144 SysBusDevice *sbd = SYS_BUS_DEVICE(obj); 145 IoTKitSysInfo *s = IOTKIT_SYSINFO(obj); 146 147 memory_region_init_io(&s->iomem, obj, &iotkit_sysinfo_ops, 148 s, "iotkit-sysinfo", 0x1000); 149 sysbus_init_mmio(sbd, &s->iomem); 150 } 151 152 static void iotkit_sysinfo_realize(DeviceState *dev, Error **errp) 153 { 154 IoTKitSysInfo *s = IOTKIT_SYSINFO(dev); 155 156 if (!armsse_version_valid(s->sse_version)) { 157 error_setg(errp, "invalid sse-version value %d", s->sse_version); 158 return; 159 } 160 } 161 162 static void iotkit_sysinfo_class_init(ObjectClass *klass, void *data) 163 { 164 DeviceClass *dc = DEVICE_CLASS(klass); 165 166 /* 167 * This device has no guest-modifiable state and so it 168 * does not need a reset function or VMState. 169 */ 170 dc->realize = iotkit_sysinfo_realize; 171 device_class_set_props(dc, iotkit_sysinfo_props); 172 } 173 174 static const TypeInfo iotkit_sysinfo_info = { 175 .name = TYPE_IOTKIT_SYSINFO, 176 .parent = TYPE_SYS_BUS_DEVICE, 177 .instance_size = sizeof(IoTKitSysInfo), 178 .instance_init = iotkit_sysinfo_init, 179 .class_init = iotkit_sysinfo_class_init, 180 }; 181 182 static void iotkit_sysinfo_register_types(void) 183 { 184 type_register_static(&iotkit_sysinfo_info); 185 } 186 187 type_init(iotkit_sysinfo_register_types); 188