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(µbit_info); 82 } 83 84 type_init(microbit_machine_init); 85