02e2da45c4
Implement and use a common device bus state. The main side-effect is that creating a bus and attaching it to a parent device are no longer separate operations. For legacy code we allow a NULL parent, but that should go away eventually. Also tweak creation code to veriry theat a device in on the right bus. Signed-off-by: Paul Brook <paul@codesourcery.com>
66 lines
1.5 KiB
C
66 lines
1.5 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 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(const char *name, int size, SSISlaveInfo *info)
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{
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assert(size >= sizeof(SSISlave));
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info->qdev.init = ssi_slave_init;
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info->qdev.bus_type = BUS_TYPE_SSI;
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qdev_register(name, size, &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(BUS_TYPE_SSI, sizeof(SSIBus), 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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}
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