/*
 * Copyright (c) 2006-2020, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2020-04-05     bigmagic     Initial version
 */

#ifndef _DRV_UART_H__
#define _DRV_UART_H__

#include "ls2k1000.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
#define	IER_ITxE	0x2
#define	IER_ILE	    0x4
#define	IER_IME	    0x8

/* 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