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 30 REG32(SYS_VERSION, 0x0) 31 REG32(SYS_CONFIG, 0x4) 32 REG32(PID4, 0xfd0) 33 REG32(PID5, 0xfd4) 34 REG32(PID6, 0xfd8) 35 REG32(PID7, 0xfdc) 36 REG32(PID0, 0xfe0) 37 REG32(PID1, 0xfe4) 38 REG32(PID2, 0xfe8) 39 REG32(PID3, 0xfec) 40 REG32(CID0, 0xff0) 41 REG32(CID1, 0xff4) 42 REG32(CID2, 0xff8) 43 REG32(CID3, 0xffc) 44 45 /* PID/CID values */ 46 static 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 52 static 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 79 static 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 88 static 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 99 static 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 }; 104 105 static 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 } 114 115 static 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 dc->props = iotkit_sysinfo_props; 125 } 126 127 static 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 }; 134 135 static void iotkit_sysinfo_register_types(void) 136 { 137 type_register_static(&iotkit_sysinfo_info); 138 } 139 140 type_init(iotkit_sysinfo_register_types); 141