1 /* 2 * ARM SSE-200 Message Handling Unit (MHU) 3 * 4 * Copyright (c) 2019 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 Message Handling Unit (MHU) which is part of the 14 * Arm SSE-200 and documented in 15 * https://developer.arm.com/documentation/101104/latest/ 16 */ 17 18 #include "qemu/osdep.h" 19 #include "qemu/log.h" 20 #include "qemu/module.h" 21 #include "trace.h" 22 #include "qapi/error.h" 23 #include "hw/sysbus.h" 24 #include "migration/vmstate.h" 25 #include "hw/registerfields.h" 26 #include "hw/irq.h" 27 #include "hw/misc/armsse-mhu.h" 28 29 REG32(CPU0INTR_STAT, 0x0) 30 REG32(CPU0INTR_SET, 0x4) 31 REG32(CPU0INTR_CLR, 0x8) 32 REG32(CPU1INTR_STAT, 0x10) 33 REG32(CPU1INTR_SET, 0x14) 34 REG32(CPU1INTR_CLR, 0x18) 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 /* Valid bits in the interrupt registers. If any are set the IRQ is raised */ 49 #define INTR_MASK 0xf 50 51 /* PID/CID values */ 52 static const int armsse_mhu_id[] = { 53 0x04, 0x00, 0x00, 0x00, /* PID4..PID7 */ 54 0x56, 0xb8, 0x0b, 0x00, /* PID0..PID3 */ 55 0x0d, 0xf0, 0x05, 0xb1, /* CID0..CID3 */ 56 }; 57 58 static void armsse_mhu_update(ARMSSEMHU *s) 59 { 60 qemu_set_irq(s->cpu0irq, s->cpu0intr != 0); 61 qemu_set_irq(s->cpu1irq, s->cpu1intr != 0); 62 } 63 64 static uint64_t armsse_mhu_read(void *opaque, hwaddr offset, unsigned size) 65 { 66 ARMSSEMHU *s = ARMSSE_MHU(opaque); 67 uint64_t r; 68 69 switch (offset) { 70 case A_CPU0INTR_STAT: 71 r = s->cpu0intr; 72 break; 73 74 case A_CPU1INTR_STAT: 75 r = s->cpu1intr; 76 break; 77 78 case A_PID4 ... A_CID3: 79 r = armsse_mhu_id[(offset - A_PID4) / 4]; 80 break; 81 82 case A_CPU0INTR_SET: 83 case A_CPU0INTR_CLR: 84 case A_CPU1INTR_SET: 85 case A_CPU1INTR_CLR: 86 qemu_log_mask(LOG_GUEST_ERROR, 87 "SSE MHU: read of write-only register at offset 0x%x\n", 88 (int)offset); 89 r = 0; 90 break; 91 92 default: 93 qemu_log_mask(LOG_GUEST_ERROR, 94 "SSE MHU read: bad offset 0x%x\n", (int)offset); 95 r = 0; 96 break; 97 } 98 trace_armsse_mhu_read(offset, r, size); 99 return r; 100 } 101 102 static void armsse_mhu_write(void *opaque, hwaddr offset, 103 uint64_t value, unsigned size) 104 { 105 ARMSSEMHU *s = ARMSSE_MHU(opaque); 106 107 trace_armsse_mhu_write(offset, value, size); 108 109 switch (offset) { 110 case A_CPU0INTR_SET: 111 s->cpu0intr |= (value & INTR_MASK); 112 break; 113 case A_CPU0INTR_CLR: 114 s->cpu0intr &= ~(value & INTR_MASK); 115 break; 116 case A_CPU1INTR_SET: 117 s->cpu1intr |= (value & INTR_MASK); 118 break; 119 case A_CPU1INTR_CLR: 120 s->cpu1intr &= ~(value & INTR_MASK); 121 break; 122 123 case A_CPU0INTR_STAT: 124 case A_CPU1INTR_STAT: 125 case A_PID4 ... A_CID3: 126 qemu_log_mask(LOG_GUEST_ERROR, 127 "SSE MHU: write to read-only register at offset 0x%x\n", 128 (int)offset); 129 break; 130 131 default: 132 qemu_log_mask(LOG_GUEST_ERROR, 133 "SSE MHU write: bad offset 0x%x\n", (int)offset); 134 break; 135 } 136 137 armsse_mhu_update(s); 138 } 139 140 static const MemoryRegionOps armsse_mhu_ops = { 141 .read = armsse_mhu_read, 142 .write = armsse_mhu_write, 143 .endianness = DEVICE_LITTLE_ENDIAN, 144 .valid.min_access_size = 4, 145 .valid.max_access_size = 4, 146 }; 147 148 static void armsse_mhu_reset(DeviceState *dev) 149 { 150 ARMSSEMHU *s = ARMSSE_MHU(dev); 151 152 s->cpu0intr = 0; 153 s->cpu1intr = 0; 154 } 155 156 static const VMStateDescription armsse_mhu_vmstate = { 157 .name = "armsse-mhu", 158 .version_id = 1, 159 .minimum_version_id = 1, 160 .fields = (const VMStateField[]) { 161 VMSTATE_UINT32(cpu0intr, ARMSSEMHU), 162 VMSTATE_UINT32(cpu1intr, ARMSSEMHU), 163 VMSTATE_END_OF_LIST() 164 }, 165 }; 166 167 static void armsse_mhu_init(Object *obj) 168 { 169 SysBusDevice *sbd = SYS_BUS_DEVICE(obj); 170 ARMSSEMHU *s = ARMSSE_MHU(obj); 171 172 memory_region_init_io(&s->iomem, obj, &armsse_mhu_ops, 173 s, "armsse-mhu", 0x1000); 174 sysbus_init_mmio(sbd, &s->iomem); 175 sysbus_init_irq(sbd, &s->cpu0irq); 176 sysbus_init_irq(sbd, &s->cpu1irq); 177 } 178 179 static void armsse_mhu_class_init(ObjectClass *klass, void *data) 180 { 181 DeviceClass *dc = DEVICE_CLASS(klass); 182 183 device_class_set_legacy_reset(dc, armsse_mhu_reset); 184 dc->vmsd = &armsse_mhu_vmstate; 185 } 186 187 static const TypeInfo armsse_mhu_info = { 188 .name = TYPE_ARMSSE_MHU, 189 .parent = TYPE_SYS_BUS_DEVICE, 190 .instance_size = sizeof(ARMSSEMHU), 191 .instance_init = armsse_mhu_init, 192 .class_init = armsse_mhu_class_init, 193 }; 194 195 static void armsse_mhu_register_types(void) 196 { 197 type_register_static(&armsse_mhu_info); 198 } 199 200 type_init(armsse_mhu_register_types); 201