2 * QEMU Synchronous Serial Interface support
4 * Copyright (c) 2009 CodeSourcery.
5 * Written by Paul Brook
7 * This code is licensed under the GNU GPL v2.
9 * Contributions after 2012-01-13 are licensed under the terms of the
10 * GNU GPL, version 2 or (at your option) any later version.
19 static struct BusInfo ssi_bus_info
= {
21 .size
= sizeof(SSIBus
),
24 static int ssi_slave_init(DeviceState
*dev
, DeviceInfo
*base_info
)
26 SSISlave
*s
= SSI_SLAVE(dev
);
27 SSISlaveClass
*ssc
= SSI_SLAVE_GET_CLASS(s
);
30 bus
= FROM_QBUS(SSIBus
, qdev_get_parent_bus(dev
));
31 if (QTAILQ_FIRST(&bus
->qbus
.children
) != dev
32 || QTAILQ_NEXT(dev
, sibling
) != NULL
) {
33 hw_error("Too many devices on SSI bus");
39 void ssi_register_slave(DeviceInfo
*info
)
41 assert(info
->size
>= sizeof(SSISlave
));
42 info
->init
= ssi_slave_init
;
43 info
->bus_info
= &ssi_bus_info
;
47 DeviceState
*ssi_create_slave(SSIBus
*bus
, const char *name
)
50 dev
= qdev_create(&bus
->qbus
, name
);
51 qdev_init_nofail(dev
);
55 SSIBus
*ssi_create_bus(DeviceState
*parent
, const char *name
)
58 bus
= qbus_create(&ssi_bus_info
, parent
, name
);
59 return FROM_QBUS(SSIBus
, bus
);
62 uint32_t ssi_transfer(SSIBus
*bus
, uint32_t val
)
67 dev
= QTAILQ_FIRST(&bus
->qbus
.children
);
71 slave
= SSI_SLAVE(dev
);
72 ssc
= SSI_SLAVE_GET_CLASS(slave
);
73 return ssc
->transfer(slave
, val
);