qemu/hw/ssi.c
Paul Brook 02e2da45c4 Add common BusState
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>
2009-05-23 00:13:41 +01:00

66 lines
1.5 KiB
C

/*
* QEMU Synchronous Serial Interface support
*
* Copyright (c) 2009 CodeSourcery.
* Written by Paul Brook
*
* This code is licenced under the GNU GPL v2.
*/
#include "ssi.h"
struct SSIBus {
BusState qbus;
};
static void ssi_slave_init(DeviceState *dev, DeviceInfo *base_info)
{
SSISlaveInfo *info = container_of(base_info, SSISlaveInfo, qdev);
SSISlave *s = SSI_SLAVE_FROM_QDEV(dev);
SSIBus *bus;
bus = FROM_QBUS(SSIBus, qdev_get_parent_bus(dev));
if (LIST_FIRST(&bus->qbus.children) != dev
|| LIST_NEXT(dev, sibling) != NULL) {
hw_error("Too many devices on SSI bus");
}
s->info = info;
info->init(s);
}
void ssi_register_slave(const char *name, int size, SSISlaveInfo *info)
{
assert(size >= sizeof(SSISlave));
info->qdev.init = ssi_slave_init;
info->qdev.bus_type = BUS_TYPE_SSI;
qdev_register(name, size, &info->qdev);
}
DeviceState *ssi_create_slave(SSIBus *bus, const char *name)
{
DeviceState *dev;
dev = qdev_create(&bus->qbus, name);
qdev_init(dev);
return dev;
}
SSIBus *ssi_create_bus(DeviceState *parent, const char *name)
{
BusState *bus;
bus = qbus_create(BUS_TYPE_SSI, sizeof(SSIBus), parent, name);
return FROM_QBUS(SSIBus, bus);
}
uint32_t ssi_transfer(SSIBus *bus, uint32_t val)
{
DeviceState *dev;
SSISlave *slave;
dev = LIST_FIRST(&bus->qbus.children);
if (!dev) {
return 0;
}
slave = SSI_SLAVE_FROM_QDEV(dev);
return slave->info->transfer(slave, val);
}