root / hw / ssi.c @ 3180d772
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/*
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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 void 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 (LIST_FIRST(&bus->qbus.children) != dev
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|| LIST_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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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(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 = LIST_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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} |