1 /*
2 * BBC micro:bit machine
3 * http://tech.microbit.org/hardware/
4 *
5 * Copyright 2018 Joel Stanley <joel@jms.id.au>
6 *
7 * This code is licensed under the GPL version 2 or later. See
8 * the COPYING file in the top-level directory.
9 */
10
11 #include "qemu/osdep.h"
12 #include "qapi/error.h"
13 #include "hw/boards.h"
14 #include "hw/arm/boot.h"
15 #include "sysemu/sysemu.h"
16 #include "exec/address-spaces.h"
17
18 #include "hw/arm/nrf51_soc.h"
19 #include "hw/i2c/microbit_i2c.h"
20 #include "hw/qdev-properties.h"
21 #include "qom/object.h"
22
23 struct MicrobitMachineState {
24 MachineState parent;
25
26 NRF51State nrf51;
27 MicrobitI2CState i2c;
28 };
29
30 #define TYPE_MICROBIT_MACHINE MACHINE_TYPE_NAME("microbit")
31
OBJECT_DECLARE_SIMPLE_TYPE(MicrobitMachineState,MICROBIT_MACHINE)32 OBJECT_DECLARE_SIMPLE_TYPE(MicrobitMachineState, MICROBIT_MACHINE)
33
34 static void microbit_init(MachineState *machine)
35 {
36 MicrobitMachineState *s = MICROBIT_MACHINE(machine);
37 MemoryRegion *system_memory = get_system_memory();
38 MemoryRegion *mr;
39
40 object_initialize_child(OBJECT(machine), "nrf51", &s->nrf51,
41 TYPE_NRF51_SOC);
42 qdev_prop_set_chr(DEVICE(&s->nrf51), "serial0", serial_hd(0));
43 object_property_set_link(OBJECT(&s->nrf51), "memory",
44 OBJECT(system_memory), &error_fatal);
45 sysbus_realize(SYS_BUS_DEVICE(&s->nrf51), &error_fatal);
46
47 /*
48 * Overlap the TWI stub device into the SoC. This is a microbit-specific
49 * hack until we implement the nRF51 TWI controller properly and the
50 * magnetometer/accelerometer devices.
51 */
52 object_initialize_child(OBJECT(machine), "microbit.twi", &s->i2c,
53 TYPE_MICROBIT_I2C);
54 sysbus_realize(SYS_BUS_DEVICE(&s->i2c), &error_fatal);
55 mr = sysbus_mmio_get_region(SYS_BUS_DEVICE(&s->i2c), 0);
56 memory_region_add_subregion_overlap(&s->nrf51.container, NRF51_TWI_BASE,
57 mr, -1);
58
59 armv7m_load_kernel(ARM_CPU(first_cpu), machine->kernel_filename,
60 0, s->nrf51.flash_size);
61 }
62
microbit_machine_class_init(ObjectClass * oc,void * data)63 static void microbit_machine_class_init(ObjectClass *oc, void *data)
64 {
65 MachineClass *mc = MACHINE_CLASS(oc);
66
67 mc->desc = "BBC micro:bit (Cortex-M0)";
68 mc->init = microbit_init;
69 mc->max_cpus = 1;
70 }
71
72 static const TypeInfo microbit_info = {
73 .name = TYPE_MICROBIT_MACHINE,
74 .parent = TYPE_MACHINE,
75 .instance_size = sizeof(MicrobitMachineState),
76 .class_init = microbit_machine_class_init,
77 };
78
microbit_machine_init(void)79 static void microbit_machine_init(void)
80 {
81 type_register_static(µbit_info);
82 }
83
84 type_init(microbit_machine_init);
85