source: svn/trunk/newcon3bcm2_21bu/dta/src/nexus_serial.c

/*************************************************************************
**
**     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);
}