Archipelago » qemu

/*

 * 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)

{

    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);