hw/arm/microbit.c

   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
  21 typedef struct {
  22     MachineState parent;
  23
  24     NRF51State nrf51;
  25     MicrobitI2CState i2c;
  26 } MicrobitMachineState;
  27
  28 #define TYPE_MICROBIT_MACHINE MACHINE_TYPE_NAME("microbit")
  29
  30 #define MICROBIT_MACHINE(obj) \
  31     OBJECT_CHECK(MicrobitMachineState, obj, TYPE_MICROBIT_MACHINE)
  32
  33 static void microbit_init(MachineState *machine)
  34 {
  35     MicrobitMachineState *s = MICROBIT_MACHINE(machine);
  36     MemoryRegion *system_memory = get_system_memory();
  37     MemoryRegion *mr;
  38     Object *soc = OBJECT(&s->nrf51);
  39     Object *i2c = OBJECT(&s->i2c);
  40
  41     sysbus_init_child_obj(OBJECT(machine), "nrf51", soc, sizeof(s->nrf51),
  42                           TYPE_NRF51_SOC);
  43     qdev_prop_set_chr(DEVICE(&s->nrf51), "serial0", serial_hd(0));
  44     object_property_set_link(soc, OBJECT(system_memory), "memory",
  45                              &error_fatal);
  46     object_property_set_bool(soc, true, "realized", &error_fatal);
  47
  48     /*
  49      * Overlap the TWI stub device into the SoC.  This is a microbit-specific
  50      * hack until we implement the nRF51 TWI controller properly and the
  51      * magnetometer/accelerometer devices.
  52      */
  53     sysbus_init_child_obj(OBJECT(machine), "microbit.twi", i2c,
  54                           sizeof(s->i2c), TYPE_MICROBIT_I2C);
  55     object_property_set_bool(i2c, true, "realized", &error_fatal);
  56     mr = sysbus_mmio_get_region(SYS_BUS_DEVICE(i2c), 0);
  57     memory_region_add_subregion_overlap(&s->nrf51.container, NRF51_TWI_BASE,
  58                                         mr, -1);
  59
  60     armv7m_load_kernel(ARM_CPU(first_cpu), machine->kernel_filename,
  61                        NRF51_SOC(soc)->flash_size);
  62 }
  63
  64 static void microbit_machine_class_init(ObjectClass *oc, void *data)
  65 {
  66     MachineClass *mc = MACHINE_CLASS(oc);
  67
  68     mc->desc = "BBC micro:bit";
  69     mc->init = microbit_init;
  70     mc->max_cpus = 1;
  71 }
  72
  73 static const TypeInfo microbit_info = {
  74     .name = TYPE_MICROBIT_MACHINE,
  75     .parent = TYPE_MACHINE,
  76     .instance_size = sizeof(MicrobitMachineState),
  77     .class_init = microbit_machine_class_init,
  78 };
  79
  80 static void microbit_machine_init(void)
  81 {
  82     type_register_static(&microbit_info);
  83 }
  84
  85 type_init(microbit_machine_init);