1 /*
2 * SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) 2024 IBM Corp.
4 *
5 * IBM Local bus where FSI slaves are connected
6 */
7
8 #include "qemu/osdep.h"
9 #include "qapi/error.h"
10 #include "hw/fsi/lbus.h"
11 #include "hw/qdev-properties.h"
12 #include "qemu/log.h"
13 #include "trace.h"
14
15 #define TO_REG(offset) ((offset) >> 2)
16
fsi_lbus_init(Object * o)17 static void fsi_lbus_init(Object *o)
18 {
19 FSILBus *lbus = FSI_LBUS(o);
20
21 memory_region_init(&lbus->mr, OBJECT(lbus), TYPE_FSI_LBUS, 1 * MiB);
22 }
23
24 static const TypeInfo fsi_lbus_info = {
25 .name = TYPE_FSI_LBUS,
26 .parent = TYPE_BUS,
27 .instance_init = fsi_lbus_init,
28 .instance_size = sizeof(FSILBus),
29 };
30
31 static const TypeInfo fsi_lbus_device_type_info = {
32 .name = TYPE_FSI_LBUS_DEVICE,
33 .parent = TYPE_DEVICE,
34 .instance_size = sizeof(FSILBusDevice),
35 .abstract = true,
36 };
37
fsi_scratchpad_read(void * opaque,hwaddr addr,unsigned size)38 static uint64_t fsi_scratchpad_read(void *opaque, hwaddr addr, unsigned size)
39 {
40 FSIScratchPad *s = SCRATCHPAD(opaque);
41 int reg = TO_REG(addr);
42
43 trace_fsi_scratchpad_read(addr, size);
44
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",
48 __func__, addr);
49 return 0;
50 }
51
52 return s->regs[reg];
53 }
54
fsi_scratchpad_write(void * opaque,hwaddr addr,uint64_t data,unsigned size)55 static void fsi_scratchpad_write(void *opaque, hwaddr addr, uint64_t data,
56 unsigned size)
57 {
58 FSIScratchPad *s = SCRATCHPAD(opaque);
59
60 trace_fsi_scratchpad_write(addr, size, data);
61 int reg = TO_REG(addr);
62
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",
66 __func__, addr);
67 return;
68 }
69
70 s->regs[reg] = data;
71 }
72
73 static const struct MemoryRegionOps scratchpad_ops = {
74 .read = fsi_scratchpad_read,
75 .write = fsi_scratchpad_write,
76 .endianness = DEVICE_BIG_ENDIAN,
77 };
78
fsi_scratchpad_realize(DeviceState * dev,Error ** errp)79 static void fsi_scratchpad_realize(DeviceState *dev, Error **errp)
80 {
81 FSILBusDevice *ldev = FSI_LBUS_DEVICE(dev);
82
83 memory_region_init_io(&ldev->iomem, OBJECT(ldev), &scratchpad_ops,
84 ldev, TYPE_FSI_SCRATCHPAD, 0x400);
85 }
86
fsi_scratchpad_reset(DeviceState * dev)87 static void fsi_scratchpad_reset(DeviceState *dev)
88 {
89 FSIScratchPad *s = SCRATCHPAD(dev);
90
91 memset(s->regs, 0, sizeof(s->regs));
92 }
93
fsi_scratchpad_class_init(ObjectClass * klass,void * data)94 static void fsi_scratchpad_class_init(ObjectClass *klass, void *data)
95 {
96 DeviceClass *dc = DEVICE_CLASS(klass);
97
98 dc->bus_type = TYPE_FSI_LBUS;
99 dc->realize = fsi_scratchpad_realize;
100 device_class_set_legacy_reset(dc, fsi_scratchpad_reset);
101 }
102
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,
108 };
109
fsi_lbus_register_types(void)110 static void fsi_lbus_register_types(void)
111 {
112 type_register_static(&fsi_lbus_info);
113 type_register_static(&fsi_lbus_device_type_info);
114 type_register_static(&fsi_scratchpad_info);
115 }
116
117 type_init(fsi_lbus_register_types);
118