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e23a1b33b5
Like qdev_init(), but terminate program via hw_error() instead of returning an error value. Use it instead of qdev_init() where terminating the program on failure is okay, either because it's during machine construction, or because we know that failure can't happen. Because relying in the latter is somewhat unclean, and the former is not always obvious, it would be nice to go back to qdev_init() in the not-so-obvious cases, only with proper error handling. I'm leaving that for another day, because it involves making sure that error values are properly checked by all callers. Patchworks-ID: 35168 Signed-off-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.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 licenced 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 (QLIST_FIRST(&bus->qbus.children) != dev
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|| QLIST_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 = QLIST_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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