d8bb00d6d7
SCSI buses will need to read the children list first-to-last. This requires using a QTAILQ, because hell breaks loose if you just try inserting at the tail (thus reversing the order of all existing visits from last-to-first to first-to-tail). Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
71 lines
1.6 KiB
C
71 lines
1.6 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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#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, DeviceInfo *base_info)
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{
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SSISlaveInfo *info = container_of(base_info, SSISlaveInfo, qdev);
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SSISlave *s = SSI_SLAVE_FROM_QDEV(dev);
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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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s->info = info;
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return info->init(s);
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}
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void ssi_register_slave(SSISlaveInfo *info)
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{
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assert(info->qdev.size >= sizeof(SSISlave));
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info->qdev.init = ssi_slave_init;
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info->qdev.bus_info = &ssi_bus_info;
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qdev_register(&info->qdev);
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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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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_FROM_QDEV(dev);
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return slave->info->transfer(slave, val);
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}
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