We have to be able to plug our platform bus into an existing system somehow.
To achieve this, we add a sysbus <-> platbus bridge device that maps an
arbitrary number of IRQ lines to a self-contained linear platform IRQ range.
It also provides a memory region that is the parent region for all platform
devices that get created below this bus.
Signed-off-by: Alexander Graf <ag...@suse.de>
---
hw/platbus/bridge.c | 64 +++++++++++++++++++++++++++++++++++++++++++++
include/hw/platbus/bridge.h | 32 +++++++++++++++++++++++
2 files changed, 96 insertions(+)
create mode 100644 hw/platbus/bridge.c
create mode 100644 include/hw/platbus/bridge.h
diff --git a/hw/platbus/bridge.c b/hw/platbus/bridge.c
new file mode 100644
index 0000000..356d254
--- /dev/null
+++ b/hw/platbus/bridge.c
@@ -0,0 +1,64 @@
+/*
+ * Sysbus to Platform bus bridge device
+ *
+ * Copyright 2013 Freescale Semiconductor, Inc.
+ *
+ * Authors: Alexander Graf, <ag...@suse.de>
+ *
+ * This is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This bridge device allows you to plug a platform bus into your existing
+ * system bus.
+ */
+
+#include "qemu-common.h"
+#include "hw/platbus/bridge.h"
+
+static void platbus_bridge_realize(DeviceState *dev, Error **errp)
+{
+ SysBusDevice *d = SYS_BUS_DEVICE(dev);
+ PlatBusBridgeState *s = PLATBUS_BRIDGE(dev);
+ int i;
+
+ /* Create platform bus */
+ qbus_create_inplace(&s->bus.parent_obj, TYPE_PLAT_BUS, dev, NULL);
+
+ /* Wire up all platbus IRQs to sysbus IRQs. */
+ for (i = 0; i < s->nr_irqs; i++) {
+ sysbus_init_irq(d, &s->bus.irqs[i]);
+ platbus_add_irq(&s->bus, i);
+ }
+
+ /* Advertise our platbus memory hole to sysbus. Through this a guest OS
+ can access platbus devices */
+ sysbus_init_mmio(d, &s->bus.mem);
+}
+
+static Property platbus_bridge_properties[] = {
+ DEFINE_PROP_UINT32("nr_irqs", PlatBusBridgeState, nr_irqs, 0),
+ DEFINE_PROP_END_OF_LIST(),
+};
+
+static void serial_platbus_class_init(ObjectClass *oc, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(oc);
+ dc->props = platbus_bridge_properties;
+ dc->realize = platbus_bridge_realize;
+}
+
+static const TypeInfo platbus_bridge_type_info = {
+ .name = TYPE_PLATBUS_BRIDGE,
+ .parent = TYPE_SYS_BUS_DEVICE,
+ .instance_size = sizeof(PlatBusBridgeState),
+ .class_init = serial_platbus_class_init,
+};
+
+static void platbus_bridge_register_types(void)
+{
+ type_register_static(&platbus_bridge_type_info);
+}
+
+type_init(platbus_bridge_register_types)
diff --git a/include/hw/platbus/bridge.h b/include/hw/platbus/bridge.h
new file mode 100644
index 0000000..4d31fcb
--- /dev/null
+++ b/include/hw/platbus/bridge.h
@@ -0,0 +1,32 @@
+/*
+ * Generic platform bus with dynamic IRQ and IO placement
+ *
+ * Copyright 2013 Freescale Semiconductor, Inc.
+ *
+ * Authors: Alexander Graf, <ag...@suse.de>
+ *
+ * This is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef QEMU_HW_PLATBUS_BRIDGE_H
+#define QEMU_HW_PLATBUS_BRIDGE_H
+
+#include "platbus.h"
+#include "hw/sysbus.h"
+
+#define TYPE_PLATBUS_BRIDGE "platbus-bridge"
+#define PLATBUS_BRIDGE(obj) OBJECT_CHECK(PlatBusBridgeState, (obj),
TYPE_PLATBUS_BRIDGE)
+
+typedef struct PlatBusBridgeState {
+ /*< private >*/
+ SysBusDevice parent_obj;
+ /*< public >*/
+
+ PlatBusState bus;
+ uint32_t nr_irqs;
+} PlatBusBridgeState;
+
+#endif /* !QEMU_HW_PLATBUS_BRIDGE_H */
--
1.8.1.4
