| 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, const 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); |