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/*
* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright (C) 2024 IBM Corp.
*
* IBM Flexible Service Interface
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qemu/log.h"
#include "trace.h"
#include "hw/fsi/fsi.h"
#define TO_REG(x) ((x) >> 2)
static const TypeInfo fsi_bus_info = {
.name = TYPE_FSI_BUS,
.parent = TYPE_BUS,
.instance_size = sizeof(FSIBus),
};
static uint64_t fsi_slave_read(void *opaque, hwaddr addr, unsigned size)
{
FSISlaveState *s = FSI_SLAVE(opaque);
int reg = TO_REG(addr);
trace_fsi_slave_read(addr, size);
if (reg >= FSI_SLAVE_CONTROL_NR_REGS) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: Out of bounds read: 0x%"HWADDR_PRIx" for %u\n",
__func__, addr, size);
return 0;
}
return s->regs[reg];
}
static void fsi_slave_write(void *opaque, hwaddr addr, uint64_t data,
unsigned size)
{
FSISlaveState *s = FSI_SLAVE(opaque);
int reg = TO_REG(addr);
trace_fsi_slave_write(addr, size, data);
if (reg >= FSI_SLAVE_CONTROL_NR_REGS) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: Out of bounds write: 0x%"HWADDR_PRIx" for %u\n",
__func__, addr, size);
return;
}
s->regs[reg] = data;
}
static const struct MemoryRegionOps fsi_slave_ops = {
.read = fsi_slave_read,
.write = fsi_slave_write,
.endianness = DEVICE_BIG_ENDIAN,
};
static void fsi_slave_reset(DeviceState *dev)
{
FSISlaveState *s = FSI_SLAVE(dev);
/* Initialize registers */
memset(s->regs, 0, sizeof(s->regs));
}
static void fsi_slave_init(Object *o)
{
FSISlaveState *s = FSI_SLAVE(o);
memory_region_init_io(&s->iomem, OBJECT(s), &fsi_slave_ops,
s, TYPE_FSI_SLAVE, 0x400);
}
static void fsi_slave_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->bus_type = TYPE_FSI_BUS;
dc->desc = "FSI Slave";
dc->reset = fsi_slave_reset;
}
static const TypeInfo fsi_slave_info = {
.name = TYPE_FSI_SLAVE,
.parent = TYPE_DEVICE,
.instance_init = fsi_slave_init,
.instance_size = sizeof(FSISlaveState),
.class_init = fsi_slave_class_init,
};
static void fsi_register_types(void)
{
type_register_static(&fsi_bus_info);
type_register_static(&fsi_slave_info);
}
type_init(fsi_register_types);
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