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 typedef struct MicrobitMachineState MicrobitMachineState; 30 31 #define TYPE_MICROBIT_MACHINE MACHINE_TYPE_NAME("microbit") 32 33 DECLARE_INSTANCE_CHECKER(MicrobitMachineState, MICROBIT_MACHINE, 34 TYPE_MICROBIT_MACHINE) 35 36 static void microbit_init(MachineState *machine) 37 { 38 MicrobitMachineState *s = MICROBIT_MACHINE(machine); 39 MemoryRegion *system_memory = get_system_memory(); 40 MemoryRegion *mr; 41 42 object_initialize_child(OBJECT(machine), "nrf51", &s->nrf51, 43 TYPE_NRF51_SOC); 44 qdev_prop_set_chr(DEVICE(&s->nrf51), "serial0", serial_hd(0)); 45 object_property_set_link(OBJECT(&s->nrf51), "memory", 46 OBJECT(system_memory), &error_fatal); 47 sysbus_realize(SYS_BUS_DEVICE(&s->nrf51), &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 object_initialize_child(OBJECT(machine), "microbit.twi", &s->i2c, 55 TYPE_MICROBIT_I2C); 56 sysbus_realize(SYS_BUS_DEVICE(&s->i2c), &error_fatal); 57 mr = sysbus_mmio_get_region(SYS_BUS_DEVICE(&s->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 s->nrf51.flash_size); 63 } 64 65 static 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 74 static 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 81 static void microbit_machine_init(void) 82 { 83 type_register_static(µbit_info); 84 } 85 86 type_init(microbit_machine_init); 87