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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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42
include/hw/i2c/microbit_i2c.h Normal file
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/*
* Microbit stub for Nordic Semiconductor nRF51 SoC Two-Wire Interface
* http://infocenter.nordicsemi.com/pdf/nRF51_RM_v3.0.1.pdf
*
* Copyright 2019 Red Hat, Inc.
*
* This code is licensed under the GPL version 2 or later. See
* the COPYING file in the top-level directory.
*/
#ifndef MICROBIT_I2C_H
#define MICROBIT_I2C_H
#include "hw/sysbus.h"
#include "hw/arm/nrf51.h"
#define NRF51_TWI_TASK_STARTRX 0x000
#define NRF51_TWI_TASK_STARTTX 0x008
#define NRF51_TWI_TASK_STOP 0x014
#define NRF51_TWI_EVENT_STOPPED 0x104
#define NRF51_TWI_EVENT_RXDREADY 0x108
#define NRF51_TWI_EVENT_TXDSENT 0x11c
#define NRF51_TWI_REG_ENABLE 0x500
#define NRF51_TWI_REG_RXD 0x518
#define NRF51_TWI_REG_TXD 0x51c
#define NRF51_TWI_REG_ADDRESS 0x588
#define TYPE_MICROBIT_I2C "microbit.i2c"
#define MICROBIT_I2C(obj) \
OBJECT_CHECK(MicrobitI2CState, (obj), TYPE_MICROBIT_I2C)
#define MICROBIT_I2C_NREGS (NRF51_TWI_SIZE / sizeof(uint32_t))
typedef struct {
SysBusDevice parent_obj;
MemoryRegion iomem;
uint32_t regs[MICROBIT_I2C_NREGS];
uint32_t read_idx;
} MicrobitI2CState;
#endif /* MICROBIT_I2C_H */