LXR qemu/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#include "hw/qdev-properties.h"
  21
  22typedef struct {
  23    MachineState parent;
  24
  25    NRF51State nrf51;
  26    MicrobitI2CState i2c;
  27} MicrobitMachineState;
  28
  29#define TYPE_MICROBIT_MACHINE MACHINE_TYPE_NAME("microbit")
  30
  31#define MICROBIT_MACHINE(obj) \
  32    OBJECT_CHECK(MicrobitMachineState, obj, TYPE_MICROBIT_MACHINE)
  33
  34static void microbit_init(MachineState *machine)
  35{
  36    MicrobitMachineState *s = MICROBIT_MACHINE(machine);
  37    MemoryRegion *system_memory = get_system_memory();
  38    MemoryRegion *mr;
  39    Object *soc = OBJECT(&s->nrf51);
  40    Object *i2c = OBJECT(&s->i2c);
  41
  42    sysbus_init_child_obj(OBJECT(machine), "nrf51", soc, sizeof(s->nrf51),
  43                          TYPE_NRF51_SOC);
  44    qdev_prop_set_chr(DEVICE(&s->nrf51), "serial0", serial_hd(0));
  45    object_property_set_link(soc, OBJECT(system_memory), "memory",
  46                             &error_fatal);
  47    object_property_set_bool(soc, true, "realized", &error_fatal);
  48
  49    /*
  50     * Overlap the TWI stub device into the SoC.  This is a microbit-specific
  51     * hack until we implement the nRF51 TWI controller properly and the
  52     * magnetometer/accelerometer devices.
  53     */
  54    sysbus_init_child_obj(OBJECT(machine), "microbit.twi", i2c,
  55                          sizeof(s->i2c), TYPE_MICROBIT_I2C);
  56    object_property_set_bool(i2c, true, "realized", &error_fatal);
  57    mr = sysbus_mmio_get_region(SYS_BUS_DEVICE(i2c), 0);
  58    memory_region_add_subregion_overlap(&s->nrf51.container, NRF51_TWI_BASE,
  59                                        mr, -1);
  60
  61    armv7m_load_kernel(ARM_CPU(first_cpu), machine->kernel_filename,
  62                       NRF51_SOC(soc)->flash_size);
  63}
  64
  65static void microbit_machine_class_init(ObjectClass *oc, void *data)
  66{
  67    MachineClass *mc = MACHINE_CLASS(oc);
  68
  69    mc->desc = "BBC micro:bit";
  70    mc->init = microbit_init;
  71    mc->max_cpus = 1;
  72}
  73
  74static const TypeInfo microbit_info = {
  75    .name = TYPE_MICROBIT_MACHINE,
  76    .parent = TYPE_MACHINE,
  77    .instance_size = sizeof(MicrobitMachineState),
  78    .class_init = microbit_machine_class_init,
  79};
  80
  81static void microbit_machine_init(void)
  82{
  83    type_register_static(&microbit_info);
  84}
  85
  86type_init(microbit_machine_init);
  87