arm: Add BBC micro:bit machine

This adds the base for a machine model of the BBC micro:bit:

  https://en.wikipedia.org/wiki/Micro_Bit

This is a system with a nRF51 SoC containing the main processor, with
various peripherals on board.
Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: NJoel Stanley <joel@jms.id.au>
Message-id: 20180831220920.27113-4-joel@jms.id.au
Reviewed-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

hw/arm/Makefile.objs

@@ -37,4 +37,4 @@ obj-$(CONFIG_IOTKIT) += iotkit.o
 obj-$(CONFIG_FSL_IMX7) += fsl-imx7.o mcimx7d-sabre.o
 obj-$(CONFIG_ARM_SMMUV3) += smmu-common.o smmuv3.o
 obj-$(CONFIG_FSL_IMX6UL) += fsl-imx6ul.o mcimx6ul-evk.o
-obj-$(CONFIG_NRF51_SOC) += nrf51_soc.o
+obj-$(CONFIG_NRF51_SOC) += nrf51_soc.o microbit.o

hw/arm/microbit.c

+/*
+ * BBC micro:bit machine
+ * http://tech.microbit.org/hardware/
+ *
+ * Copyright 2018 Joel Stanley <joel@jms.id.au>
+ *
+ * This code is licensed under the GPL version 2 or later.  See
+ * the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "hw/boards.h"
+#include "hw/arm/arm.h"
+#include "exec/address-spaces.h"
+
+#include "hw/arm/nrf51_soc.h"
+
+typedef struct {
+    MachineState parent;
+
+    NRF51State nrf51;
+} MicrobitMachineState;
+
+#define TYPE_MICROBIT_MACHINE MACHINE_TYPE_NAME("microbit")
+
+#define MICROBIT_MACHINE(obj) \
+    OBJECT_CHECK(MicrobitMachineState, obj, TYPE_MICROBIT_MACHINE)
+
+static void microbit_init(MachineState *machine)
+{
+    MicrobitMachineState *s = MICROBIT_MACHINE(machine);
+    MemoryRegion *system_memory = get_system_memory();
+    Object *soc = OBJECT(&s->nrf51);
+
+    sysbus_init_child_obj(OBJECT(machine), "nrf51", soc, sizeof(s->nrf51),
+                          TYPE_NRF51_SOC);
+    object_property_set_link(soc, OBJECT(system_memory), "memory",
+                             &error_fatal);
+    object_property_set_bool(soc, true, "realized", &error_fatal);
+
+    armv7m_load_kernel(ARM_CPU(first_cpu), machine->kernel_filename,
+                       NRF51_SOC(soc)->flash_size);
+}
+
+static void microbit_machine_class_init(ObjectClass *oc, void *data)
+{
+    MachineClass *mc = MACHINE_CLASS(oc);
+
+    mc->desc = "BBC micro:bit";
+    mc->init = microbit_init;
+    mc->max_cpus = 1;
+}
+
+static const TypeInfo microbit_info = {
+    .name = TYPE_MICROBIT_MACHINE,
+    .parent = TYPE_MACHINE,
+    .instance_size = sizeof(MicrobitMachineState),
+    .class_init = microbit_machine_class_init,
+};
+
+static void microbit_machine_init(void)
+{
+    type_register_static(&microbit_info);
+}
+
+type_init(microbit_machine_init);