1/*
2 * nRF51 SoC UART emulation
3 *
4 * Copyright (c) 2018 Julia Suvorova <jusual@mail.ru>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 or
8 * (at your option) any later version.
9 */
10
11#ifndef NRF51_UART_H
12#define NRF51_UART_H
13
14#include "hw/sysbus.h"
15#include "chardev/char-fe.h"
16#include "hw/registerfields.h"
17
18#define UART_FIFO_LENGTH 6
19#define UART_SIZE 0x1000
20
21#define TYPE_NRF51_UART "nrf51_soc.uart"
22#define NRF51_UART(obj) OBJECT_CHECK(NRF51UARTState, (obj), TYPE_NRF51_UART)
23
24REG32(UART_STARTRX, 0x000)
25REG32(UART_STOPRX, 0x004)
26REG32(UART_STARTTX, 0x008)
27REG32(UART_STOPTX, 0x00C)
28REG32(UART_SUSPEND, 0x01C)
29
30REG32(UART_CTS, 0x100)
31REG32(UART_NCTS, 0x104)
32REG32(UART_RXDRDY, 0x108)
33REG32(UART_TXDRDY, 0x11C)
34REG32(UART_ERROR, 0x124)
35REG32(UART_RXTO, 0x144)
36
37REG32(UART_INTEN, 0x300)
38 FIELD(UART_INTEN, CTS, 0, 1)
39 FIELD(UART_INTEN, NCTS, 1, 1)
40 FIELD(UART_INTEN, RXDRDY, 2, 1)
41 FIELD(UART_INTEN, TXDRDY, 7, 1)
42 FIELD(UART_INTEN, ERROR, 9, 1)
43 FIELD(UART_INTEN, RXTO, 17, 1)
44REG32(UART_INTENSET, 0x304)
45REG32(UART_INTENCLR, 0x308)
46REG32(UART_ERRORSRC, 0x480)
47REG32(UART_ENABLE, 0x500)
48REG32(UART_PSELRTS, 0x508)
49REG32(UART_PSELTXD, 0x50C)
50REG32(UART_PSELCTS, 0x510)
51REG32(UART_PSELRXD, 0x514)
52REG32(UART_RXD, 0x518)
53REG32(UART_TXD, 0x51C)
54REG32(UART_BAUDRATE, 0x524)
55REG32(UART_CONFIG, 0x56C)
56
57typedef struct NRF51UARTState {
58 SysBusDevice parent_obj;
59
60 MemoryRegion iomem;
61 CharBackend chr;
62 qemu_irq irq;
63 guint watch_tag;
64
65 uint8_t rx_fifo[UART_FIFO_LENGTH];
66 unsigned int rx_fifo_pos;
67 unsigned int rx_fifo_len;
68
69 uint32_t reg[0x56C];
70
71 bool rx_started;
72 bool tx_started;
73 bool pending_tx_byte;
74 bool enabled;
75} NRF51UARTState;
76
77#endif
78