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Steffen Görtz9d68bf52019-01-29 11:46:03 +00001/*
2 * Microbit stub for Nordic Semiconductor nRF51 SoC Two-Wire Interface
3 * http://infocenter.nordicsemi.com/pdf/nRF51_RM_v3.0.1.pdf
4 *
5 * Copyright 2019 Red Hat, Inc.
6 *
7 * This code is licensed under the GPL version 2 or later. See
8 * the COPYING file in the top-level directory.
9 */
10
11#ifndef MICROBIT_I2C_H
12#define MICROBIT_I2C_H
13
14#include "hw/sysbus.h"
15#include "hw/arm/nrf51.h"
Eduardo Habkostdb1015e2020-09-03 16:43:22 -040016#include "qom/object.h"
Steffen Görtz9d68bf52019-01-29 11:46:03 +000017
18#define NRF51_TWI_TASK_STARTRX 0x000
19#define NRF51_TWI_TASK_STARTTX 0x008
20#define NRF51_TWI_TASK_STOP 0x014
21#define NRF51_TWI_EVENT_STOPPED 0x104
22#define NRF51_TWI_EVENT_RXDREADY 0x108
23#define NRF51_TWI_EVENT_TXDSENT 0x11c
24#define NRF51_TWI_REG_ENABLE 0x500
25#define NRF51_TWI_REG_RXD 0x518
26#define NRF51_TWI_REG_TXD 0x51c
27#define NRF51_TWI_REG_ADDRESS 0x588
28
29#define TYPE_MICROBIT_I2C "microbit.i2c"
Eduardo Habkost80633962020-09-16 14:25:19 -040030OBJECT_DECLARE_SIMPLE_TYPE(MicrobitI2CState, MICROBIT_I2C)
Steffen Görtz9d68bf52019-01-29 11:46:03 +000031
Philippe Mathieu-Daudé54595a52020-05-04 09:28:19 +020032#define MICROBIT_I2C_NREGS (NRF51_PERIPHERAL_SIZE / sizeof(uint32_t))
Steffen Görtz9d68bf52019-01-29 11:46:03 +000033
Eduardo Habkostdb1015e2020-09-03 16:43:22 -040034struct MicrobitI2CState {
Steffen Görtz9d68bf52019-01-29 11:46:03 +000035 SysBusDevice parent_obj;
36
37 MemoryRegion iomem;
38 uint32_t regs[MICROBIT_I2C_NREGS];
39 uint32_t read_idx;
Eduardo Habkostdb1015e2020-09-03 16:43:22 -040040};
Steffen Görtz9d68bf52019-01-29 11:46:03 +000041
42#endif /* MICROBIT_I2C_H */