mirror of https://gitee.com/openkylin/qemu.git
89 lines
1.9 KiB
C
89 lines
1.9 KiB
C
/*
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* QEMU Synchronous Serial Interface support
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*
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* Copyright (c) 2009 CodeSourcery.
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* Written by Paul Brook
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*
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* This code is licensed under the GNU GPL v2.
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*
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* Contributions after 2012-01-13 are licensed under the terms of the
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* GNU GPL, version 2 or (at your option) any later version.
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*/
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#include "ssi.h"
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struct SSIBus {
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BusState qbus;
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};
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static struct BusInfo ssi_bus_info = {
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.name = "SSI",
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.size = sizeof(SSIBus),
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};
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static int ssi_slave_init(DeviceState *dev)
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{
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SSISlave *s = SSI_SLAVE(dev);
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SSISlaveClass *ssc = SSI_SLAVE_GET_CLASS(s);
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SSIBus *bus;
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bus = FROM_QBUS(SSIBus, qdev_get_parent_bus(dev));
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if (QTAILQ_FIRST(&bus->qbus.children) != dev
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|| QTAILQ_NEXT(dev, sibling) != NULL) {
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hw_error("Too many devices on SSI bus");
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}
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return ssc->init(s);
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}
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static void ssi_slave_class_init(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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dc->init = ssi_slave_init;
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dc->bus_info = &ssi_bus_info;
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}
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static TypeInfo ssi_slave_info = {
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.name = TYPE_SSI_SLAVE,
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.parent = TYPE_DEVICE,
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.class_init = ssi_slave_class_init,
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.class_size = sizeof(SSISlaveClass),
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.abstract = true,
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};
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DeviceState *ssi_create_slave(SSIBus *bus, const char *name)
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{
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DeviceState *dev;
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dev = qdev_create(&bus->qbus, name);
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qdev_init_nofail(dev);
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return dev;
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}
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SSIBus *ssi_create_bus(DeviceState *parent, const char *name)
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{
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BusState *bus;
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bus = qbus_create(&ssi_bus_info, parent, name);
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return FROM_QBUS(SSIBus, bus);
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}
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uint32_t ssi_transfer(SSIBus *bus, uint32_t val)
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{
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DeviceState *dev;
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SSISlave *slave;
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SSISlaveClass *ssc;
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dev = QTAILQ_FIRST(&bus->qbus.children);
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if (!dev) {
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return 0;
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}
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slave = SSI_SLAVE(dev);
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ssc = SSI_SLAVE_GET_CLASS(slave);
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return ssc->transfer(slave, val);
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}
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static void ssi_slave_register_types(void)
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{
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type_register_static(&ssi_slave_info);
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}
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type_init(ssi_slave_register_types)
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