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arm: Stub out NRF51 TWI magnetometer/accelerometer detection

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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>
This commit is contained in:
Steffen Görtz 2019-01-29 11:46:03 +00:00 • committed by Peter Maydell
parent ab65eed3f8
commit 9d68bf564e
6 changed files with 189 additions and 0 deletions
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16
hw/arm/microbit.c
View file

@ -16,11 +16,13 @@
#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")
@ -32,7 +34,9 @@ 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);
@ -41,6 +45,18 @@ static void microbit_init(MachineState *machine)
&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);
}