Merge commit 'gnu/master' into test

[qemu] / hw / ssi.c

diff --git a/hw/ssi.c b/hw/ssi.c
new file mode 100644 (file)
index 0000000..52b7b7c
--- /dev/null
+++ b/hw/ssi.c
@@ -0,0 +1,65 @@
+/*
+ * 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);
+}