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