1 /* 2 * SPDX-License-Identifier: GPL-2.0-or-later 3 * Copyright (C) 2024 IBM Corp. 4 * 5 * IBM Flexible Service Interface 6 */ 7 #include "qemu/osdep.h" 8 #include "qapi/error.h" 9 #include "qemu/log.h" 10 #include "trace.h" 11 12 #include "hw/fsi/fsi.h" 13 14 #define TO_REG(x) ((x) >> 2) 15 16 static const TypeInfo fsi_bus_info = { 17 .name = TYPE_FSI_BUS, 18 .parent = TYPE_BUS, 19 .instance_size = sizeof(FSIBus), 20 }; 21 22 static uint64_t fsi_slave_read(void *opaque, hwaddr addr, unsigned size) 23 { 24 FSISlaveState *s = FSI_SLAVE(opaque); 25 int reg = TO_REG(addr); 26 27 trace_fsi_slave_read(addr, size); 28 29 if (reg >= FSI_SLAVE_CONTROL_NR_REGS) { 30 qemu_log_mask(LOG_GUEST_ERROR, 31 "%s: Out of bounds read: 0x%"HWADDR_PRIx" for %u\n", 32 __func__, addr, size); 33 return 0; 34 } 35 36 return s->regs[reg]; 37 } 38 39 static void fsi_slave_write(void *opaque, hwaddr addr, uint64_t data, 40 unsigned size) 41 { 42 FSISlaveState *s = FSI_SLAVE(opaque); 43 int reg = TO_REG(addr); 44 45 trace_fsi_slave_write(addr, size, data); 46 47 if (reg >= FSI_SLAVE_CONTROL_NR_REGS) { 48 qemu_log_mask(LOG_GUEST_ERROR, 49 "%s: Out of bounds write: 0x%"HWADDR_PRIx" for %u\n", 50 __func__, addr, size); 51 return; 52 } 53 54 s->regs[reg] = data; 55 } 56 57 static const struct MemoryRegionOps fsi_slave_ops = { 58 .read = fsi_slave_read, 59 .write = fsi_slave_write, 60 .endianness = DEVICE_BIG_ENDIAN, 61 }; 62 63 static void fsi_slave_reset(DeviceState *dev) 64 { 65 FSISlaveState *s = FSI_SLAVE(dev); 66 67 /* Initialize registers */ 68 memset(s->regs, 0, sizeof(s->regs)); 69 } 70 71 static void fsi_slave_init(Object *o) 72 { 73 FSISlaveState *s = FSI_SLAVE(o); 74 75 memory_region_init_io(&s->iomem, OBJECT(s), &fsi_slave_ops, 76 s, TYPE_FSI_SLAVE, 0x400); 77 } 78 79 static void fsi_slave_class_init(ObjectClass *klass, void *data) 80 { 81 DeviceClass *dc = DEVICE_CLASS(klass); 82 83 dc->bus_type = TYPE_FSI_BUS; 84 dc->desc = "FSI Slave"; 85 device_class_set_legacy_reset(dc, fsi_slave_reset); 86 } 87 88 static const TypeInfo fsi_slave_info = { 89 .name = TYPE_FSI_SLAVE, 90 .parent = TYPE_DEVICE, 91 .instance_init = fsi_slave_init, 92 .instance_size = sizeof(FSISlaveState), 93 .class_init = fsi_slave_class_init, 94 }; 95 96 static void fsi_register_types(void) 97 { 98 type_register_static(&fsi_bus_info); 99 type_register_static(&fsi_slave_info); 100 } 101 102 type_init(fsi_register_types); 103