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#include "qom/object.h"
  22
  23struct MicrobitMachineState {
  24    MachineState parent;
  25
  26    NRF51State nrf51;
  27    MicrobitI2CState i2c;
  28};
  29
  30#define TYPE_MICROBIT_MACHINE MACHINE_TYPE_NAME("microbit")
  31
  32OBJECT_DECLARE_SIMPLE_TYPE(MicrobitMachineState, 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
  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                       s->nrf51.flash_size);
  61}
  62
  63static 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
  72static 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
  79static void microbit_machine_init(void)
  80{
  81    type_register_static(&microbit_info);
  82}
  83
  84type_init(microbit_machine_init);
  85