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1 | /* |
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" | |
db1015e9 | 16 | #include "qom/object.h" |
9d68bf56 SG |
17 | |
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" | |
8063396b | 30 | OBJECT_DECLARE_SIMPLE_TYPE(MicrobitI2CState, MICROBIT_I2C) |
9d68bf56 | 31 | |
54595a57 | 32 | #define MICROBIT_I2C_NREGS (NRF51_PERIPHERAL_SIZE / sizeof(uint32_t)) |
9d68bf56 | 33 | |
db1015e9 | 34 | struct MicrobitI2CState { |
9d68bf56 SG |
35 | SysBusDevice parent_obj; |
36 | ||
37 | MemoryRegion iomem; | |
38 | uint32_t regs[MICROBIT_I2C_NREGS]; | |
39 | uint32_t read_idx; | |
db1015e9 | 40 | }; |
9d68bf56 SG |
41 | |
42 | #endif /* MICROBIT_I2C_H */ |