diff options
| author | Steffen Görtz <contrib@steffen-goertz.de> | 2019-01-29 11:46:03 +0000 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2019-01-29 11:46:03 +0000 |
| commit | 9d68bf564ecd038c8939b9779f4b6d62a01ce6f3 (patch) | |
| tree | 0609383cbf6e3b8a635fcff272ecfd4d4cb27d6d /include | |
| parent | ab65eed3f82b57459ef8c45f75a89241f16cbad8 (diff) | |
arm: Stub out NRF51 TWI magnetometer/accelerometer detection
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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/hw/arm/nrf51.h | 2 | ||||
| -rw-r--r-- | include/hw/arm/nrf51_soc.h | 1 | ||||
| -rw-r--r-- | include/hw/i2c/microbit_i2c.h | 42 |
3 files changed, 45 insertions, 0 deletions
diff --git a/include/hw/arm/nrf51.h b/include/hw/arm/nrf51.h index 175bb6c301..1008fee6c9 100644 --- a/include/hw/arm/nrf51.h +++ b/include/hw/arm/nrf51.h @@ -25,6 +25,8 @@ #define NRF51_IOMEM_SIZE 0x20000000 #define NRF51_UART_BASE 0x40002000 +#define NRF51_TWI_BASE 0x40003000 +#define NRF51_TWI_SIZE 0x00001000 #define NRF51_TIMER_BASE 0x40008000 #define NRF51_TIMER_SIZE 0x00001000 #define NRF51_RNG_BASE 0x4000D000 diff --git a/include/hw/arm/nrf51_soc.h b/include/hw/arm/nrf51_soc.h index e06f0304b4..fbdefc07e4 100644 --- a/include/hw/arm/nrf51_soc.h +++ b/include/hw/arm/nrf51_soc.h @@ -39,6 +39,7 @@ typedef struct NRF51State { MemoryRegion sram; MemoryRegion flash; MemoryRegion clock; + MemoryRegion twi; uint32_t sram_size; uint32_t flash_size; diff --git a/include/hw/i2c/microbit_i2c.h b/include/hw/i2c/microbit_i2c.h new file mode 100644 index 0000000000..aad636127e --- /dev/null +++ b/include/hw/i2c/microbit_i2c.h @@ -0,0 +1,42 @@ +/* + * 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 */ |