+/*
+ * 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);
+}