/*
 * File      : serial.c
 * This file is part of RT-Thread RTOS
 * COPYRIGHT (C) 2006, RT-Thread Development Team
 *
 * The license and distribution terms for this file may be
 * found in the file LICENSE in this distribution or at
 * http://openlab.rt-thread.com/license/LICENSE
 *
 * Change Logs:
 * Date           Author       Notes
 * 2006-03-13     Bernard      first version
 * 2009-04-20     yi.qiu      modified according bernard's stm32 version
 * 2010-10-6      wangmeng    added sep4020 surpport     	  	
 */

#ifndef __SERIAL_H__
#define __SERIAL_H__

#include <sep4020.h>

#define	USTAT_RCV_READY		0x01   	/* receive data ready */ 
#define	USTAT_TXB_EMPTY		0x40   	/* tx buffer empty */
#define BPS					115200	/* serial baudrate */

#define UART_RX_BUFFER_SIZE		64
#define UART_TX_BUFFER_SIZE		64

/*For sep4020's uart have several secondary function*/
/*we use union to decribe it*/

union dlbl_fifo
{
	rt_uint32_t dlbl;
	rt_uint32_t rxfifo;
	rt_uint32_t txfifo;	
};

union dlbh_ier
{
	rt_uint32_t dlbh;
	rt_uint32_t ier;
};

union iir_fcr
{
	rt_uint32_t iir;
	rt_uint32_t fcr;
};

struct serial_int_rx
{
	rt_uint8_t  rx_buffer[UART_RX_BUFFER_SIZE];
	rt_uint32_t read_index, save_index;
};

struct serial_int_tx
{
	rt_uint8_t  tx_buffer[UART_TX_BUFFER_SIZE];
	rt_uint32_t write_index, save_index;
};

typedef struct uartport
{
	union dlbl_fifo dlbl_fifo;
	union dlbh_ier	dlbh_ier;
	union iir_fcr	iir_fcr;
	rt_uint32_t lcr;
	rt_uint32_t mcr;
	rt_uint32_t lsr;
	rt_uint32_t msr;
}uartport;

struct serial_device
{
	uartport* uart_device;
	
	/* rx structure */
	struct serial_int_rx* int_rx;

	/* tx structure */
	struct serial_int_tx* int_tx;
};

rt_err_t rt_hw_serial_register(rt_device_t device, const char* name, rt_uint32_t flag, struct serial_device *serial);

void rt_hw_serial_isr(rt_device_t device);


#endif
