rt-thread/bsp/mipssim/drivers/drv_uart.h

/*
 * Copyright (c) 2006-2019, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2019-12-04     Jiaxun Yang  Initial version
 */

#ifndef _MIPSSIM_DRV_UART_H__
#define _MIPSSIM_DRV_UART_H__

#include "mipssim.h"
#include <rthw.h>

/* UART registers */
#define UART_DAT(base)      HWREG8(base + 0x00)
#define UART_IER(base)      HWREG8(base + 0x01)
#define UART_IIR(base)      HWREG8(base + 0x02)
#define UART_FCR(base)      HWREG8(base + 0x02)
#define UART_LCR(base)      HWREG8(base + 0x03)
#define UART_MCR(base)      HWREG8(base + 0x04)
#define UART_LSR(base)      HWREG8(base + 0x05)
#define UART_MSR(base)      HWREG8(base + 0x06)

#define UART_LSB(base)      HWREG8(base + 0x00)
#define UART_MSB(base)      HWREG8(base + 0x01)

/* interrupt enable register */
#define IER_IRxE    0x1 /* 接收有效数据中断使能 */
#define IER_ITxE    0x2 /* 传输保存寄存器为空中断使能 */
#define IER_ILE     0x4 /* 接收器线路状态中断使能 */
#define IER_IME     0x8 /* Modem状态中断使能 */

/* interrupt identification register */
#define IIR_IMASK   0xf /* mask */
#define IIR_RXTOUT  0xc /* receive timeout */
#define IIR_RLS     0x6 /* receive line status */
#define IIR_RXRDY   0x4 /* receive ready */
#define IIR_TXRDY   0x2 /* transmit ready */
#define IIR_NOPEND  0x1 /* nothing */
#define IIR_MLSC    0x0 /* modem status */
#define IIR_FIFO_MASK   0xc0    /* set if FIFOs are enabled */

/* fifo control register */
#define FIFO_ENABLE     0x01    /* enable fifo */
#define FIFO_RCV_RST    0x02    /* reset receive fifo */
#define FIFO_XMT_RST    0x04    /* reset transmit fifo */
#define FIFO_DMA_MODE   0x08    /* enable dma mode */
#define FIFO_TRIGGER_1  0x00    /* trigger at 1 char */
#define FIFO_TRIGGER_4  0x40    /* trigger at 4 chars */
#define FIFO_TRIGGER_8  0x80    /* trigger at 8 chars */
#define FIFO_TRIGGER_14 0xc0    /* trigger at 14 chars */

// 线路控制寄存器
/* character format control register */
#define CFCR_DLAB   0x80    /* divisor latch */
#define CFCR_SBREAK 0x40    /* send break */
#define CFCR_PZERO  0x30    /* zero parity */
#define CFCR_PONE   0x20    /* one parity */
#define CFCR_PEVEN  0x10    /* even parity */
#define CFCR_PODD   0x00    /* odd parity */
#define CFCR_PENAB  0x08    /* parity enable */
#define CFCR_STOPB  0x04    /* 2 stop bits */
#define CFCR_8BITS  0x03    /* 8 data bits */
#define CFCR_7BITS  0x02    /* 7 data bits */
#define CFCR_6BITS  0x01    /* 6 data bits */
#define CFCR_5BITS  0x00    /* 5 data bits */

/* modem control register */
#define MCR_LOOPBACK    0x10    /* loopback */
#define MCR_IENABLE 0x08    /* output 2 = int enable */
#define MCR_DRS     0x04    /* output 1 = xxx */
#define MCR_RTS     0x02    /* enable RTS */
#define MCR_DTR     0x01    /* enable DTR */

/* line status register */
#define LSR_RCV_FIFO    0x80    /* error in receive fifo */
#define LSR_TSRE    0x40    /* transmitter empty */
#define LSR_TXRDY   0x20    /* transmitter ready */
#define LSR_BI      0x10    /* break detected */
#define LSR_FE      0x08    /* framing error */
#define LSR_PE      0x04    /* parity error */
#define LSR_OE      0x02    /* overrun error */
#define LSR_RXRDY   0x01    /* receiver ready */
#define LSR_RCV_MASK    0x1f


/* UART interrupt enable register value */
#define UARTIER_IME     (1 << 3)
#define UARTIER_ILE     (1 << 2)
#define UARTIER_ITXE    (1 << 1)
#define UARTIER_IRXE    (1 << 0)

/* UART line control register value */
#define UARTLCR_DLAB    (1 << 7)
#define UARTLCR_BCB     (1 << 6)
#define UARTLCR_SPB     (1 << 5)
#define UARTLCR_EPS     (1 << 4)
#define UARTLCR_PE      (1 << 3)
#define UARTLCR_SB      (1 << 2)

/* UART line status register value */
#define UARTLSR_ERROR   (1 << 7)
#define UARTLSR_TE      (1 << 6)
#define UARTLSR_TFE     (1 << 5)
#define UARTLSR_BI      (1 << 4)
#define UARTLSR_FE      (1 << 3)
#define UARTLSR_PE      (1 << 2)
#define UARTLSR_OE      (1 << 1)
#define UARTLSR_DR      (1 << 0)

#endif