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