mxpcdrv.c

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	while ( 1 ) {
	    irqbits = inb(port->vector) & port->vectormask;
	    if ( irqbits == port->vectormask )
			break;

	    handled = 1;
	    for ( i=0, bits=1; i<max; i++, irqbits |= bits, bits <<= 1 ) {
		if ( irqbits == port->vectormask )
		   	break;
		if ( bits & irqbits )
		    continue;
		info = port + i;

		// following add by Victor Yu. 09-13-2002
		iir = inb(info->base+UART_IIR);
		if ( iir & UART_IIR_NO_INT )
			continue;
		iir &= MOXA_MUST_IIR_MASK;
		if ( !info->tty ) {
			status = inb(info->base+UART_LSR);
			outb(0x27, info->base+UART_FCR);
			inb(info->base+UART_MSR);
			continue;
		}
		// above add by Victor Yu. 09-13-2002

		/* mask by Victor Yu. 09-13-2002
		if ( !info->tty ||
		     (inb(info->base + UART_IIR) & UART_IIR_NO_INT) )
		    continue;
		*/
		/* mask by Victor Yu. 09-02-2002
		status = inb(info->base + UART_LSR) & info->read_status_mask;
		*/

		// following add by Victor Yu. 09-02-2002
		status = inb(info->base+UART_LSR);
		if ( info->IsMoxaMustChipFlag ) {
			/*
			if ( (status & 0x02) && !(status & 0x01) ) {
				outb(info->base+UART_FCR,  0x23);
				continue;
			}
			*/
			if ( iir == MOXA_MUST_IIR_GDA ||
			     iir == MOXA_MUST_IIR_RDA ||
			     iir == MOXA_MUST_IIR_RTO ||
			     iir == MOXA_MUST_IIR_LSR )
				mxpcdrv_receive_chars(info, &status);
		} else {
		// above add by Victor Yu. 09-02-2002

			status &= info->read_status_mask;
			if ( status & UART_LSR_DR )
			    mxpcdrv_receive_chars(info, &status);
		}
		msr = inb(info->base + UART_MSR);
		if ( msr & UART_MSR_ANY_DELTA )
		    mxpcdrv_check_modem_status(info, msr);

		// following add by Victor Yu. 09-13-2002
		if ( info->IsMoxaMustChipFlag ) {
			if ( iir == 0x02 )
				mxpcdrv_transmit_chars(info);
		} else {
		// above add by Victor Yu. 09-13-2002

			if ( status & UART_LSR_THRE ) {
/* 8-2-99 by William
			    if ( info->x_char || (info->xmit_cnt > 0) )
*/
				mxpcdrv_transmit_chars(info);
			}
		}
	    }
	    if ( pass_counter++ > MXPCDRV_ISR_PASS_LIMIT ) {
#if 0
		printk("MOXA PC104 Communication Module driver interrupt loop break\n");
#endif
		break;	/* Prevent infinite loops */
	    }
	}
irq_stop:
	return IRQ_RETVAL(handled);
}

#if defined (_SCREEN_INFO_H) || (LINUX_VERSION_CODE > VERSION_CODE(2,6,15))
static void mxpcdrv_receive_chars(struct mxpcdrv_struct *info,
					 int *status)
{
	struct tty_struct *	tty = info->tty;
	unsigned char		ch, gdl;
	int			ignored = 0;
	int			cnt = 0;
	int			count;
	int 			recv_room;
	int			max = 256;
	unsigned long		flags;

        count = 0;

	// following add by Victor Yu. 09-02-2002
	if ( info->IsMoxaMustChipFlag != MOXA_OTHER_UART) {

		if ( *status & UART_LSR_SPECIAL ) {
			goto intr_old;
		}

		// following add by Victor Yu. 02-11-2004
		//if ( info->IsMoxaMustChipFlag == MOXA_MUST_MU860_HWID &&
		//     (*status & MOXA_MUST_LSR_RERR) )
		//	goto intr_old;
		// above add by Victor Yu. 02-14-2004
		if(*status & MOXA_MUST_LSR_RERR)
			goto intr_old;

		gdl = inb(info->base+MOXA_MUST_GDL_REGISTER);
		
		if ( info->IsMoxaMustChipFlag == MOXA_MUST_HARDWARE_ID ) // add by Victor Yu. 02-11-2004
			gdl &= MOXA_MUST_GDL_MASK;
		
		while ( gdl-- ) {
		    	ch = inb(info->base + UART_RX);
			if(cnt>=TTY_FLIPBUF_SIZE)
				continue;
	    		count++;
			tty_insert_flip_char(tty, ch, 0);
			cnt++;
		}
		goto end_intr;
	}
intr_old:
	// above add by Victor Yu. 09-02-2002

	do {
	    if(max-- <0)
 		break;

	    ch = inb(info->base + UART_RX);
	    if(cnt>=TTY_FLIPBUF_SIZE)
		continue;
	    // following add by Victor Yu. 09-02-2002
	    if ( info->IsMoxaMustChipFlag && (*status&UART_LSR_OE) /*&& !(*status&UART_LSR_DR)*/ )
		outb(0x23, info->base+UART_FCR);
	    *status &= info->read_status_mask;
	    // above add by Victor Yu. 09-02-2002
	    if ( *status & info->ignore_status_mask ) {
		if ( ++ignored > 100 )
		    break;
	    } else {
		count++;
		if ( *status & UART_LSR_SPECIAL ) {
		    if ( *status & UART_LSR_BI ) {
			flags = TTY_BREAK;
#if (LINUX_VERSION_CODE >= VERSION_CODE(2,1,0))
			info->icount.brk++;
#endif
			if ( info->flags & ASYNC_SAK )
			    do_SAK(tty);
		    } else if ( *status & UART_LSR_PE ) {
			flags = TTY_PARITY;
#if (LINUX_VERSION_CODE >= VERSION_CODE(2,1,0))
			info->icount.parity++;
#endif
		    } else if ( *status & UART_LSR_FE ) {
			flags = TTY_FRAME;
#if (LINUX_VERSION_CODE >= VERSION_CODE(2,1,0))
			info->icount.frame++;
#endif
		    } else if ( *status & UART_LSR_OE ) {
			flags = TTY_OVERRUN;
#if (LINUX_VERSION_CODE >= VERSION_CODE(2,1,0))
			info->icount.overrun++;
#endif
		    } else
			flags = TTY_BREAK;

		} else
			flags = 0;
		tty_insert_flip_char(tty, ch, flags);
		cnt++;

	    }
	
	    // following add by Victor Yu. 09-02-2002
	    if ( info->IsMoxaMustChipFlag )
		break;
	    // above add by Victor Yu. 09-02-2002

	    /* mask by Victor Yu. 09-02-2002
	    *status = inb(info->base + UART_LSR) & info->read_status_mask;
	    */
	    // following add by Victor Yu. 09-02-2002
	    *status = inb(info->base+UART_LSR);
	    // above add by Victor Yu. 09-02-2002
	} while ( *status & UART_LSR_DR );

end_intr:	// add by Victor Yu. 09-02-2002

	mxvar_log.rxcnt[info->port] += cnt;

	recv_room = tty->receive_room;
	if(recv_room < (128*2)){
		set_bit(TTY_THROTTLED, &tty->flags);
		mxpcdrv_stoprx(tty);
	}
	tty_flip_buffer_push(tty);
}
#else
static void mxpcdrv_receive_chars(struct mxpcdrv_struct *info,
					 int *status)
{
	struct tty_struct *	tty = info->tty;
	unsigned char		ch, gdl;
	int			ignored = 0;
	int			cnt = 0;
	int			count;
	int 			recv_room;
	unsigned char           *cp;
	char                    *fp;
	int			max = 256;


	//MX_LOCK(&info->slock);

#if 0
	recv_room = tty->ldisc.receive_room(tty);
	if((recv_room == 0) && (!info->ldisc_stop_rx)){
		//mxser_throttle(tty);
       	mxpcdrv_stoprx(tty);
		//return;
	}
#endif
		
        cp = tty->flip.char_buf;
        fp = tty->flip.flag_buf;
        count = 0;

	// following add by Victor Yu. 09-02-2002
	if ( info->IsMoxaMustChipFlag ) {
		if ( *status & UART_LSR_SPECIAL ) {
			goto intr_old;
		}

		// following add by Victor Yu. 02-11-2004
		//if ( info->IsMoxaMustChipFlag == MOXA_MUST_MU860_HWID &&
		//     (*status & MOXA_MUST_LSR_RERR) )
		//	goto intr_old;
		// above add by Victor Yu. 02-14-2004
		if(*status & MOXA_MUST_LSR_RERR)
			goto intr_old;

		gdl = inb(info->base+MOXA_MUST_GDL_REGISTER);
		//gdl &= MOXA_MUST_GDL_MASK;
		
		if ( info->IsMoxaMustChipFlag == MOXA_MUST_HARDWARE_ID ) // add by Victor Yu. 02-11-2004
			gdl &= MOXA_MUST_GDL_MASK;

#if 0		
		if(gdl >= recv_room) {
			if(!info->ldisc_stop_rx){
				//mxser_throttle(tty);
        			mxpcdrv_stoprx(tty);
			}
			//return;
		}		
#endif
		
		while ( gdl-- ) {
	    	ch = inb(info->base + UART_RX);
			/*if ( tty->flip.count >= TTY_FLIPBUF_SIZE )
		    		break;
			tty->flip.count++;
			*tty->flip.char_buf_ptr++ = ch;*/
			if(cnt>=TTY_FLIPBUF_SIZE)
				continue;
				
    		count++;
			*cp++ = ch;
	    	*fp++ = 0;
			cnt++;
		}
		goto end_intr;
	}
intr_old:
	// above add by Victor Yu. 09-02-2002

	do {
	    if(max-- <0)
 		break;

	    ch = inb(info->base + UART_RX);
			if(cnt>=TTY_FLIPBUF_SIZE)
				continue;

	    // following add by Victor Yu. 09-02-2002
	    if ( info->IsMoxaMustChipFlag && (*status&UART_LSR_OE) /*&& !(*status&UART_LSR_DR)*/ )
		outb(0x23, info->base+UART_FCR);
	    *status &= info->read_status_mask;
	    // above add by Victor Yu. 09-02-2002
	    if ( *status & info->ignore_status_mask ) {
		if ( ++ignored > 100 )
		    break;
	    } else {
		/*if ( tty->flip.count >= TTY_FLIPBUF_SIZE )
		    break;
		tty->flip.count++;
		*/
		count++;
		if ( *status & UART_LSR_SPECIAL ) {
		    if ( *status & UART_LSR_BI ) {
			*fp++ = TTY_BREAK;
/* added by casper 1/11/2000 */
#if (LINUX_VERSION_CODE >= VERSION_CODE(2,1,0))
			info->icount.brk++;
#endif

/* */
			if ( info->flags & ASYNC_SAK )
			    do_SAK(tty);
		    } else if ( *status & UART_LSR_PE ) {
			*fp++ = TTY_PARITY;
/* added by casper 1/11/2000 */
#if (LINUX_VERSION_CODE >= VERSION_CODE(2,1,0))
			info->icount.parity++;
#endif
/* */
		    } else if ( *status & UART_LSR_FE ) {
			*fp++ = TTY_FRAME;
/* added by casper 1/11/2000 */
#if (LINUX_VERSION_CODE >= VERSION_CODE(2,1,0))
			info->icount.frame++;
#endif
/* */
		    } else if ( *status & UART_LSR_OE ) {
			*fp++ = TTY_OVERRUN;
/* added by casper 1/11/2000 */
#if (LINUX_VERSION_CODE >= VERSION_CODE(2,1,0))
			info->icount.overrun++;
#endif
/* */
		    } else
			*fp++ = 0;
		} else
		    *fp++ = 0;
		    *cp++ = ch;
		cnt++;
#if 0
		if(cnt>=recv_room){
			if(!info->ldisc_stop_rx){
				//mxser_throttle(tty);
        			mxpcdrv_stoprx(tty);
			}
			break;
		}
#endif
		}
	
	    // following add by Victor Yu. 09-02-2002
	    if ( info->IsMoxaMustChipFlag )
		break;
	    // above add by Victor Yu. 09-02-2002

	    /* mask by Victor Yu. 09-02-2002
	    *status = inb(info->base + UART_LSR) & info->read_status_mask;
	    */
	    // following add by Victor Yu. 09-02-2002
	    *status = inb(info->base+UART_LSR);
	    // above add by Victor Yu. 09-02-2002
	} while ( *status & UART_LSR_DR );

end_intr:	// add by Victor Yu. 09-02-2002

	mxvar_log.rxcnt[info->port] += cnt;
/* added by casper 1/11/2000 */
#if 0
#if (LINUX_VERSION_CODE >= VERSION_CODE(2,1,0))
	info->icount.rx += cnt;

	/* add by Victor Yu. 05-14-2002 following */
	clear_bit(TTY_DONT_FLIP, &tty->flags);
	/* add by Victor Yu. 05-14-2002 above */

	tty_flip_buffer_push(tty);
#else
	queue_task_irq_off(&tty->flip.tqueue, &tq_timer);
#endif
#endif
#if 1 
	tty->ldisc.receive_buf(tty, tty->flip.char_buf, tty->flip.flag_buf, count);
	//MX_UNLOCK(&info->slock);
	recv_room = tty->ldisc.receive_room(tty);
	if(recv_room < (128*2)){

		set_bit(TTY_THROTTLED, &tty->flags);
		mxpcdrv_stoprx(tty);
	}
#endif
/* */
}
#endif//_SCREEN_INFO_H

static void mxpcdrv_transmit_chars(struct mxpcdrv_struct *info)
{
	int	count, cnt;

	if ( !info)
		return;
	if ( info->x_char ) {
	    outb(info->x_char, info->base + UART_TX);
	    info->x_char = 0;
	    mxvar_log.txcnt[info->port]++;
/* added by casper 1/11/2000 */
#if (LINUX_VERSION_CODE >= VERSION_CODE(2,1,0))
	    info->icount.tx++;
#endif
/* */
	    return;
	}

if ( info->xmit_buf == 0 )
	return;

	if(info->xmit_cnt==0){
		if ( info->xmit_cnt < WAKEUP_CHARS ) {
			set_bit(MXPCDRV_EVENT_TXLOW,&info->event);
			MXQ_TASK();
		}
		return;
	}
#if 1
	if (/*(info->xmit_cnt <= 0) ||*/ info->tty->stopped ||
	    (info->tty->hw_stopped && (info->type != PORT_16550A) &&(!info->IsMoxaMustChipFlag))) {
		info->IER &= ~UART_IER_THRI;
		outb(info->IER, info->base + UART_IER);
		return;
	}
#endif

	cnt = info->xmit_cnt;
	count = info->xmit_fifo_size;
	do {
	    outb(info->xmit_buf[info->xmit_tail++], info->base + UART_TX);
	    info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE - 1);
	    if ( --info->xmit_cnt <= 0 )
		break;
	} while ( --count > 0 );
	mxvar_log.txcnt[info->port] += (cnt - info->xmit_cnt);

/* added by casper 1/11/2000 */
#if (LINUX_VERSION_CODE >= VERSION_CODE(2,1,0))
        info->icount.tx += (cnt - info->xmit_cnt);
#endif
/* */

	if ( info->xmit_cnt < WAKEUP_CHARS ) {
		set_bit(MXPCDRV_EVENT_TXLOW,&info->event);
		MXQ_TASK();
	}
#if 0
	if (info->xmit_cnt <= 0) {
		info->IER &= ~UART_IER_THRI;
		outb(info->IER, info->base + UART_IER);
	}
#en