qemu

FORK: QEMU emulator
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microbit.c (2534B)

      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 
     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 
     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 
     79 static void microbit_machine_init(void)
     80 {
     81     type_register_static(&microbit_info);
     82 }
     83 
     84 type_init(microbit_machine_init);