2 * SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) 2024 IBM Corp.
5 * IBM Local bus where FSI slaves are connected
8 #include "qemu/osdep.h"
9 #include "qapi/error.h"
10 #include "hw/fsi/lbus.h"
11 #include "hw/qdev-properties.h"
15 #define TO_REG(offset) ((offset) >> 2)
17 static void fsi_lbus_init(Object
*o
)
19 FSILBus
*lbus
= FSI_LBUS(o
);
21 memory_region_init(&lbus
->mr
, OBJECT(lbus
), TYPE_FSI_LBUS
, 1 * MiB
);
24 static const TypeInfo fsi_lbus_info
= {
25 .name
= TYPE_FSI_LBUS
,
27 .instance_init
= fsi_lbus_init
,
28 .instance_size
= sizeof(FSILBus
),
31 static const TypeInfo fsi_lbus_device_type_info
= {
32 .name
= TYPE_FSI_LBUS_DEVICE
,
33 .parent
= TYPE_DEVICE
,
34 .instance_size
= sizeof(FSILBusDevice
),
38 static uint64_t fsi_scratchpad_read(void *opaque
, hwaddr addr
, unsigned size
)
40 FSIScratchPad
*s
= SCRATCHPAD(opaque
);
41 int reg
= TO_REG(addr
);
43 trace_fsi_scratchpad_read(addr
, size
);
45 if (reg
>= FSI_SCRATCHPAD_NR_REGS
) {
46 qemu_log_mask(LOG_GUEST_ERROR
,
47 "%s: Out-of-bounds read at offset 0x%" HWADDR_PRIx
"\n",
55 static void fsi_scratchpad_write(void *opaque
, hwaddr addr
, uint64_t data
,
58 FSIScratchPad
*s
= SCRATCHPAD(opaque
);
60 trace_fsi_scratchpad_write(addr
, size
, data
);
61 int reg
= TO_REG(addr
);
63 if (reg
>= FSI_SCRATCHPAD_NR_REGS
) {
64 qemu_log_mask(LOG_GUEST_ERROR
,
65 "%s: Out-of-bounds write at offset 0x%" HWADDR_PRIx
"\n",
73 static const struct MemoryRegionOps scratchpad_ops
= {
74 .read
= fsi_scratchpad_read
,
75 .write
= fsi_scratchpad_write
,
76 .endianness
= DEVICE_BIG_ENDIAN
,
79 static void fsi_scratchpad_realize(DeviceState
*dev
, Error
**errp
)
81 FSILBusDevice
*ldev
= FSI_LBUS_DEVICE(dev
);
83 memory_region_init_io(&ldev
->iomem
, OBJECT(ldev
), &scratchpad_ops
,
84 ldev
, TYPE_FSI_SCRATCHPAD
, 0x400);
87 static void fsi_scratchpad_reset(DeviceState
*dev
)
89 FSIScratchPad
*s
= SCRATCHPAD(dev
);
91 memset(s
->regs
, 0, sizeof(s
->regs
));
94 static void fsi_scratchpad_class_init(ObjectClass
*klass
, void *data
)
96 DeviceClass
*dc
= DEVICE_CLASS(klass
);
98 dc
->bus_type
= TYPE_FSI_LBUS
;
99 dc
->realize
= fsi_scratchpad_realize
;
100 dc
->reset
= fsi_scratchpad_reset
;
103 static const TypeInfo fsi_scratchpad_info
= {
104 .name
= TYPE_FSI_SCRATCHPAD
,
105 .parent
= TYPE_FSI_LBUS_DEVICE
,
106 .instance_size
= sizeof(FSIScratchPad
),
107 .class_init
= fsi_scratchpad_class_init
,
110 static void fsi_lbus_register_types(void)
112 type_register_static(&fsi_lbus_info
);
113 type_register_static(&fsi_lbus_device_type_info
);
114 type_register_static(&fsi_scratchpad_info
);
117 type_init(fsi_lbus_register_types
);