1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
|
/*
* QEMU Synchronous Serial Interface support
*
* Copyright (c) 2009 CodeSourcery.
* Written by Paul Brook
*
* This code is licensed under the GNU GPL v2.
*
* Contributions after 2012-01-13 are licensed under the terms of the
* GNU GPL, version 2 or (at your option) any later version.
*/
#include "ssi.h"
struct SSIBus {
BusState qbus;
};
static struct BusInfo ssi_bus_info = {
.name = "SSI",
.size = sizeof(SSIBus),
};
static int ssi_slave_init(DeviceState *dev, DeviceInfo *base_info)
{
SSISlave *s = SSI_SLAVE(dev);
SSISlaveClass *ssc = SSI_SLAVE_GET_CLASS(s);
SSIBus *bus;
bus = FROM_QBUS(SSIBus, qdev_get_parent_bus(dev));
if (QTAILQ_FIRST(&bus->qbus.children) != dev
|| QTAILQ_NEXT(dev, sibling) != NULL) {
hw_error("Too many devices on SSI bus");
}
return ssc->init(s);
}
static void ssi_slave_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->init = ssi_slave_init;
dc->bus_info = &ssi_bus_info;
}
static TypeInfo ssi_slave_info = {
.name = TYPE_SSI_SLAVE,
.parent = TYPE_DEVICE,
.class_init = ssi_slave_class_init,
.class_size = sizeof(SSISlaveClass),
.abstract = true,
};
DeviceState *ssi_create_slave(SSIBus *bus, const char *name)
{
DeviceState *dev;
dev = qdev_create(&bus->qbus, name);
qdev_init_nofail(dev);
return dev;
}
SSIBus *ssi_create_bus(DeviceState *parent, const char *name)
{
BusState *bus;
bus = qbus_create(&ssi_bus_info, parent, name);
return FROM_QBUS(SSIBus, bus);
}
uint32_t ssi_transfer(SSIBus *bus, uint32_t val)
{
DeviceState *dev;
SSISlave *slave;
SSISlaveClass *ssc;
dev = QTAILQ_FIRST(&bus->qbus.children);
if (!dev) {
return 0;
}
slave = SSI_SLAVE(dev);
ssc = SSI_SLAVE_GET_CLASS(slave);
return ssc->transfer(slave, val);
}
static void register_ssi_slave(void)
{
type_register_static(&ssi_slave_info);
}
device_init(register_ssi_slave);
|
