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