Archipelago » qemu

/*

 * QEMU Synchronous Serial Interface support

 *

 * Copyright (c) 2009 CodeSourcery.

 * Written by Paul Brook

 *

 * This code is licenced under the GNU GPL v2.

 */

#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)

{

    SSISlaveInfo *info = container_of(base_info, SSISlaveInfo, qdev);

    SSISlave *s = SSI_SLAVE_FROM_QDEV(dev);

    SSIBus *bus;

    bus = FROM_QBUS(SSIBus, qdev_get_parent_bus(dev));

    if (QLIST_FIRST(&bus->qbus.children) != dev

        || QLIST_NEXT(dev, sibling) != NULL) {

        hw_error("Too many devices on SSI bus");

    }

    s->info = info;

    return info->init(s);

}

void ssi_register_slave(SSISlaveInfo *info)

{

    assert(info->qdev.size >= sizeof(SSISlave));

    info->qdev.init = ssi_slave_init;

    info->qdev.bus_info = &ssi_bus_info;

    qdev_register(&info->qdev);

}

DeviceState *ssi_create_slave(SSIBus *bus, const char *name)

{

    DeviceState *dev;

    dev = qdev_create(&bus->qbus, name);

    qdev_init(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;

    dev = QLIST_FIRST(&bus->qbus.children);

    if (!dev) {

        return 0;

    }

    slave = SSI_SLAVE_FROM_QDEV(dev);

    return slave->info->transfer(slave, val);

}