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 #include "qom/object.h" 18 19 #define UART_FIFO_LENGTH 6 20 #define UART_SIZE 0x1000 21 22 #define TYPE_NRF51_UART "nrf51_soc.uart" 23 OBJECT_DECLARE_SIMPLE_TYPE(NRF51UARTState, NRF51_UART) 24 25 REG32(UART_STARTRX, 0x000) 26 REG32(UART_STOPRX, 0x004) 27 REG32(UART_STARTTX, 0x008) 28 REG32(UART_STOPTX, 0x00C) 29 REG32(UART_SUSPEND, 0x01C) 30 31 REG32(UART_CTS, 0x100) 32 REG32(UART_NCTS, 0x104) 33 REG32(UART_RXDRDY, 0x108) 34 REG32(UART_TXDRDY, 0x11C) 35 REG32(UART_ERROR, 0x124) 36 REG32(UART_RXTO, 0x144) 37 38 REG32(UART_INTEN, 0x300) 39 FIELD(UART_INTEN, CTS, 0, 1) 40 FIELD(UART_INTEN, NCTS, 1, 1) 41 FIELD(UART_INTEN, RXDRDY, 2, 1) 42 FIELD(UART_INTEN, TXDRDY, 7, 1) 43 FIELD(UART_INTEN, ERROR, 9, 1) 44 FIELD(UART_INTEN, RXTO, 17, 1) 45 REG32(UART_INTENSET, 0x304) 46 REG32(UART_INTENCLR, 0x308) 47 REG32(UART_ERRORSRC, 0x480) 48 REG32(UART_ENABLE, 0x500) 49 REG32(UART_PSELRTS, 0x508) 50 REG32(UART_PSELTXD, 0x50C) 51 REG32(UART_PSELCTS, 0x510) 52 REG32(UART_PSELRXD, 0x514) 53 REG32(UART_RXD, 0x518) 54 REG32(UART_TXD, 0x51C) 55 REG32(UART_BAUDRATE, 0x524) 56 REG32(UART_CONFIG, 0x56C) 57 58 struct NRF51UARTState { 59 SysBusDevice parent_obj; 60 61 MemoryRegion iomem; 62 CharBackend chr; 63 qemu_irq irq; 64 guint watch_tag; 65 66 uint8_t rx_fifo[UART_FIFO_LENGTH]; 67 unsigned int rx_fifo_pos; 68 unsigned int rx_fifo_len; 69 70 uint32_t reg[0x56C]; 71 72 bool rx_started; 73 bool tx_started; 74 bool pending_tx_byte; 75 bool enabled; 76 }; 77 78 #endif 79