sysbus: Add new platform bus helper device

We need to support spawning of sysbus devices dynamically via the command line.
The easiest way to represent these dynamically spawned devices in the guest's
memory and IRQ layout is by preallocating some space for dynamic sysbus devices.

This is what the "platform bus" device does. It is a sysbus device that exports
a configurably sized MMIO region and a configurable number of IRQ lines. When
this device encounters sysbus devices that have been dynamically created and not
manually wired up, it dynamically connects them to its own pool of resources.

The machine model can then loop through all of these devices and create a guest
configuration (device tree) to make them visible to the guest.

Signed-off-by: Alexander Graf <agraf@suse.de>

1 files changed, 57 insertions, 0 deletions

diff --git a/include/hw/platform-bus.h b/include/hw/platform-bus.h
new file mode 100644
index 0000000000..bd42b83809
--- /dev/null
+++ b/include/hw/platform-bus.h
@@ -0,0 +1,57 @@
+#ifndef HW_PLATFORM_BUS_H
+#define HW_PLATFORM_BUS_H 1
+
+/*
+ *  Platform Bus device to support dynamic Sysbus devices
+ *
+ * Copyright (C) 2014 Freescale Semiconductor, Inc. All rights reserved.
+ *
+ * Author: Alexander Graf, <agraf@suse.de>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "hw/sysbus.h"
+
+typedef struct PlatformBusDevice PlatformBusDevice;
+
+#define TYPE_PLATFORM_BUS_DEVICE "platform-bus-device"
+#define PLATFORM_BUS_DEVICE(obj) \
+     OBJECT_CHECK(PlatformBusDevice, (obj), TYPE_PLATFORM_BUS_DEVICE)
+#define PLATFORM_BUS_DEVICE_CLASS(klass) \
+     OBJECT_CLASS_CHECK(PlatformBusDeviceClass, (klass), TYPE_PLATFORM_BUS_DEVICE)
+#define PLATFORM_BUS_DEVICE_GET_CLASS(obj) \
+     OBJECT_GET_CLASS(PlatformBusDeviceClass, (obj), TYPE_PLATFORM_BUS_DEVICE)
+
+struct PlatformBusDevice {
+    /*< private >*/
+    SysBusDevice parent_obj;
+    Notifier notifier;
+    bool done_gathering;
+
+    /*< public >*/
+    uint32_t mmio_size;
+    MemoryRegion mmio;
+
+    uint32_t num_irqs;
+    qemu_irq *irqs;
+    unsigned long *used_irqs;
+};
+
+int platform_bus_get_irqn(PlatformBusDevice *platform_bus, SysBusDevice *sbdev,
+                          int n);
+hwaddr platform_bus_get_mmio_addr(PlatformBusDevice *pbus, SysBusDevice *sbdev,
+                                  int n);
+
+#endif /* !HW_PLATFORM_BUS_H */