/*************************************************************************
**
**     Broadcom Corp. Confidential
**     Copyright 1999, 2000 Broadcom Corp.  All Rights Reserved.
**
**  THIS SOFTWARE MAY ONLY BE USED SUBJECT TO AN EXECUTED SOFTWARE LICENSE
**  AGREEMENT  BETWEEN THE USER AND BROADCOM.  YOU HAVE NO RIGHT TO USE OR
**  EXPLOIT THIS MATERIAL EXCEPT SUBJECT TO THE TERMS OF SUCH AN AGREEMENT.
**
**	File:         	serial.h
**	Description:  	polled uart io
**    Created:          Jeff Fisher
**    REVISION:
**
****************************************************************************/

#include "serial.h"

/***********************************************************************/
/* serial_init(UartChannel *uart,unsigned int baud)*/
/***********************************************************************/
void serial_init(volatile UartChannel *uart, unsigned int baud)
{
#if (BCHP_CHIP==7550)
	uart->sdw_lsr = 0;
#else
	/*---------------------------------------------------------------------*/
	/* Dissable channel's receiver and transmitter.                        */
	/*---------------------------------------------------------------------*/
	uart->control = 0;
//    uart->control &= ~(TXEN|RXEN);

	/*---------------------------------------------------------------------*/
    /* disable interrupts on this channel        .                          */
	/*---------------------------------------------------------------------*/
	uart->rxstat = 0;
	uart->txstat = 0;

	/*-----------------------------------------------------------------*/
	/* set character size  and parity control bit (8,none only)        */
	/*-----------------------------------------------------------------*/
	uart->control = BITM8;
	baud =  ((XTALFREQ / baud) /16);
	uart->baudh = (unsigned char)((baud >> 8) & 0xFF);
	uart->baudl = (unsigned char)(baud & 0xFF);

	/*---------------------------------------------------------------------*/
	/* Finally, re-enable the transmitter and receiver.                    */
	/*---------------------------------------------------------------------*/
	uart->control |= (TXEN|RXEN);
#endif
}

/***********************************************************************/
/* serial_getc(UartChannel *uart, int block)*/
/***********************************************************************/
#define RXRDA          0x01
#define RXOVFERR       0x02
#define RXPARERR       0x04
#define RXFRAMERR      0x08
#define RXBIERR        0x10		/* BI error */
#define RXFIFOERR      0x80 	/* Rx FIFO error */
int serial_getc(volatile UartChannel *uart, bool block)
{	
#if (BCHP_CHIP==7550)
	int blen = 1;
	unsigned int status;
	char tval;

	while (blen > 0) 
	{
		status = uart->sdw_lsr;
		if(status & (RXOVFERR | RXPARERR | RXFRAMERR | RXBIERR | RXFIFOERR)) 
		{
			/* Just read the bad character to clear the bit. */
			tval = uart->sdw_rbr_thr_dll & 0xFF;
		} 
		else if(status & RXRDA) 
		{
			tval = uart->sdw_rbr_thr_dll & 0xFF;
			blen--;
		}
		else {
			/* block if required */
			if (!block) {
				return 0;
			}
		}
	}
	return tval;
#else
	if (!block)
	{
		if (!(uart->rxstat & RXDATARDY)) {
			return 0;
		}
	} 
	while (!(uart->rxstat & RXDATARDY)) ;

	return (unsigned char)uart->rxdata;
#endif
}

/***********************************************************************/
/* serial_putc(UartChannel *uart, unsigned int c)*/
/***********************************************************************/
static inline void serial_do_putc(volatile UartChannel *uart, int c)
{
#if (BCHP_CHIP==7550)
	while (!(uart->sdw_lsr & THRE))
		;

	uart->sdw_rbr_thr_dll = (unsigned char)c;
#else
	while (!(uart->txstat & TXDREGEMT))
		;

	uart->txdata = (unsigned char)c;
#endif
}

/***********************************************************************/
/* serial_putc(UartChannel *uart, unsigned int c)*/
/***********************************************************************/
void serial_putc(volatile UartChannel *uart, int c)
{
	serial_do_putc(uart,c);
}