mirror of
https://github.com/qemu/qemu.git
synced 2024-11-26 21:33:40 +08:00
9d68bf564e
Recent microbit firmwares panic if the TWI magnetometer/accelerometer devices are not detected during startup. We don't implement TWI (I2C) so let's stub out these devices just to let the firmware boot. Signed-off by: Steffen Görtz <contrib@steffen-goertz.de> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: 20190110094020.18354-2-stefanha@redhat.com Reviewed-by: Peter Maydell <peter.maydell@linaro.org> [PMM: fixed comment style] Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
86 lines
2.5 KiB
C
86 lines
2.5 KiB
C
/*
|
|
* BBC micro:bit machine
|
|
* http://tech.microbit.org/hardware/
|
|
*
|
|
* Copyright 2018 Joel Stanley <joel@jms.id.au>
|
|
*
|
|
* This code is licensed under the GPL version 2 or later. See
|
|
* the COPYING file in the top-level directory.
|
|
*/
|
|
|
|
#include "qemu/osdep.h"
|
|
#include "qapi/error.h"
|
|
#include "hw/boards.h"
|
|
#include "hw/arm/arm.h"
|
|
#include "sysemu/sysemu.h"
|
|
#include "exec/address-spaces.h"
|
|
|
|
#include "hw/arm/nrf51_soc.h"
|
|
#include "hw/i2c/microbit_i2c.h"
|
|
|
|
typedef struct {
|
|
MachineState parent;
|
|
|
|
NRF51State nrf51;
|
|
MicrobitI2CState i2c;
|
|
} MicrobitMachineState;
|
|
|
|
#define TYPE_MICROBIT_MACHINE MACHINE_TYPE_NAME("microbit")
|
|
|
|
#define MICROBIT_MACHINE(obj) \
|
|
OBJECT_CHECK(MicrobitMachineState, obj, TYPE_MICROBIT_MACHINE)
|
|
|
|
static void microbit_init(MachineState *machine)
|
|
{
|
|
MicrobitMachineState *s = MICROBIT_MACHINE(machine);
|
|
MemoryRegion *system_memory = get_system_memory();
|
|
MemoryRegion *mr;
|
|
Object *soc = OBJECT(&s->nrf51);
|
|
Object *i2c = OBJECT(&s->i2c);
|
|
|
|
sysbus_init_child_obj(OBJECT(machine), "nrf51", soc, sizeof(s->nrf51),
|
|
TYPE_NRF51_SOC);
|
|
qdev_prop_set_chr(DEVICE(&s->nrf51), "serial0", serial_hd(0));
|
|
object_property_set_link(soc, OBJECT(system_memory), "memory",
|
|
&error_fatal);
|
|
object_property_set_bool(soc, true, "realized", &error_fatal);
|
|
|
|
/*
|
|
* Overlap the TWI stub device into the SoC. This is a microbit-specific
|
|
* hack until we implement the nRF51 TWI controller properly and the
|
|
* magnetometer/accelerometer devices.
|
|
*/
|
|
sysbus_init_child_obj(OBJECT(machine), "microbit.twi", i2c,
|
|
sizeof(s->i2c), TYPE_MICROBIT_I2C);
|
|
object_property_set_bool(i2c, true, "realized", &error_fatal);
|
|
mr = sysbus_mmio_get_region(SYS_BUS_DEVICE(i2c), 0);
|
|
memory_region_add_subregion_overlap(&s->nrf51.container, NRF51_TWI_BASE,
|
|
mr, -1);
|
|
|
|
armv7m_load_kernel(ARM_CPU(first_cpu), machine->kernel_filename,
|
|
NRF51_SOC(soc)->flash_size);
|
|
}
|
|
|
|
static void microbit_machine_class_init(ObjectClass *oc, void *data)
|
|
{
|
|
MachineClass *mc = MACHINE_CLASS(oc);
|
|
|
|
mc->desc = "BBC micro:bit";
|
|
mc->init = microbit_init;
|
|
mc->max_cpus = 1;
|
|
}
|
|
|
|
static const TypeInfo microbit_info = {
|
|
.name = TYPE_MICROBIT_MACHINE,
|
|
.parent = TYPE_MACHINE,
|
|
.instance_size = sizeof(MicrobitMachineState),
|
|
.class_init = microbit_machine_class_init,
|
|
};
|
|
|
|
static void microbit_machine_init(void)
|
|
{
|
|
type_register_static(µbit_info);
|
|
}
|
|
|
|
type_init(microbit_machine_init);
|