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); 129