xref: /src/sys/dev/sbus/magma.c

/*	$NetBSD: magma.c,v 1.10 2001/05/02 10:32:11 scw Exp $	*/
/*
 * magma.c
 *
 * Copyright (c) 1998 Iain Hibbert
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by Iain Hibbert
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */
#if 0
#define MAGMA_DEBUG
#endif

/*
 * Driver for Magma SBus Serial/Parallel cards using the Cirrus Logic
 * CD1400 & CD1190 chips
 */

#include "magma.h"
#if NMAGMA > 0

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/device.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <sys/malloc.h>
#include <sys/tty.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/syslog.h>
#include <sys/conf.h>
#include <sys/errno.h>

#include <machine/bus.h>
#include <machine/intr.h>
#include <machine/autoconf.h>
#include <machine/conf.h>

#include <dev/sbus/sbusvar.h>

#include <dev/ic/cd1400reg.h>
#include <dev/ic/cd1190reg.h>

#include <dev/sbus/mbppio.h>
#include <dev/sbus/magmareg.h>

/*
 * Select tty soft interrupt bit based on TTY ipl. (stole from zs.c)
 */
#if PIL_TTY == 1
# define IE_MSOFT IE_L1
#elif PIL_TTY == 4
# define IE_MSOFT IE_L4
#elif PIL_TTY == 6
# define IE_MSOFT IE_L6
#else
# error "no suitable software interrupt bit"
#endif

/* supported cards
 *
 *  The table below lists the cards that this driver is likely to
 *  be able to support.
 *
 *  Cards with parallel ports: except for the LC2+1Sp, they all use
 *  the CD1190 chip which I know nothing about.  I've tried to leave
 *  hooks for it so it shouldn't be too hard to add support later.
 *  (I think somebody is working on this separately)
 *
 *  Thanks to Bruce at Magma for telling me the hardware offsets.
 */
static struct magma_board_info supported_cards[] = {
	{
		"MAGMA,4_Sp", "Magma 4 Sp", 4, 0,
		1, 0xa000, 0xc000, 0xe000, { 0x8000, 0, 0, 0 },
		0, { 0, 0 }
	},
	{
		"MAGMA,8_Sp", "Magma 8 Sp", 8, 0,
		2, 0xa000, 0xc000, 0xe000, { 0x4000, 0x6000, 0, 0 },
		0, { 0, 0 }
	},
	{
		"MAGMA,_8HS_Sp", "Magma Fast 8 Sp", 8, 0,
		2, 0x2000, 0x4000, 0x6000, { 0x8000, 0xa000, 0, 0 },
		0, { 0, 0 }
	},
	{
		"MAGMA,_8SP_422", "Magma 8 Sp - 422", 8, 0,
		2, 0x2000, 0x4000, 0x6000, { 0x8000, 0xa000, 0, 0 },
		0, { 0, 0 }
	},
	{
		"MAGMA,12_Sp", "Magma 12 Sp", 12, 0,
		3, 0xa000, 0xc000, 0xe000, { 0x2000, 0x4000, 0x6000, 0 },
		0, { 0, 0 }
	},
	{
		"MAGMA,16_Sp", "Magma 16 Sp", 16, 0,
		4, 0xd000, 0xe000, 0xf000, { 0x8000, 0x9000, 0xa000, 0xb000 },
		0, { 0, 0 }
	},
	{
		"MAGMA,16_Sp_2", "Magma 16 Sp", 16, 0,
		4, 0x2000, 0x4000, 0x6000, { 0x8000, 0xa000, 0xc000, 0xe000 },
		0, { 0, 0 }
	},
	{
		"MAGMA,16HS_Sp", "Magma Fast 16 Sp", 16, 0,
		4, 0x2000, 0x4000, 0x6000, { 0x8000, 0xa000, 0xc000, 0xe000 },
		0, { 0, 0 }
	},
	{
		"MAGMA,21_Sp", "Magma LC 2+1 Sp", 2, 1,
		1, 0xa000, 0xc000, 0xe000, { 0x8000, 0, 0, 0 },
		0, { 0, 0 }
	},
	{
		"MAGMA,21HS_Sp", "Magma 2+1 Sp", 2, 1,
		1, 0xa000, 0xc000, 0xe000, { 0x4000, 0, 0, 0 },
		1, { 0x6000, 0 }
	},
	{
		"MAGMA,41_Sp", "Magma 4+1 Sp", 4, 1,
		1, 0xa000, 0xc000, 0xe000, { 0x4000, 0, 0, 0 },
		1, { 0x6000, 0 }
	},
	{
		"MAGMA,82_Sp", "Magma 8+2 Sp", 8, 2,
		2, 0xd000, 0xe000, 0xf000, { 0x8000, 0x9000, 0, 0 },
		2, { 0xa000, 0xb000 }
	},
	{
		"MAGMA,P1_Sp", "Magma P1 Sp", 0, 1,
		0, 0, 0, 0, { 0, 0, 0, 0 },
		1, { 0x8000, 0 }
	},
	{
		"MAGMA,P2_Sp", "Magma P2 Sp", 0, 2,
		0, 0, 0, 0, { 0, 0, 0, 0 },
		2, { 0x4000, 0x8000 }
	},
	{
		NULL, NULL, 0, 0,
		0, 0, 0, 0, { 0, 0, 0, 0 },
		0, { 0, 0 }
	}
};

/************************************************************************
 *
 *  Autoconfig Stuff
 */

struct cfattach magma_ca = {
	sizeof(struct magma_softc), magma_match, magma_attach
};

struct cfattach mtty_ca = {
	sizeof(struct mtty_softc), mtty_match, mtty_attach
};

struct cfattach mbpp_ca = {
	sizeof(struct mbpp_softc), mbpp_match, mbpp_attach
};

extern struct cfdriver mtty_cd;
extern struct cfdriver mbpp_cd;

/************************************************************************
 *
 *  CD1400 Routines
 *
 *	cd1400_compute_baud		calculate COR/BPR register values
 *	cd1400_write_ccr		write a value to CD1400 ccr
 *	cd1400_read_reg			read from a CD1400 register
 *	cd1400_write_reg		write to a CD1400 register
 *	cd1400_enable_transmitter	enable transmitting on CD1400 channel
 */

/*
 * compute the bpr/cor pair for any baud rate
 * returns 0 for success, 1 for failure
 */
int
cd1400_compute_baud(speed, clock, cor, bpr)
	speed_t speed;
	int clock;
	int *cor, *bpr;
{
	int c, co, br;

	if( speed < 50 || speed > 150000 )
		return(1);

	for( c = 0, co = 8 ; co <= 2048 ; co <<= 2, c++ ) {
		br = ((clock * 1000000) + (co * speed) / 2) / (co * speed);
		if( br < 0x100 ) {
			*bpr = br;
			*cor = c;
			return(0);
		}
	}

	return(1);
}

/*
 * Write a CD1400 channel command, should have a timeout?
 */
__inline void
cd1400_write_ccr(cd, cmd)
	struct cd1400 *cd;
	u_char cmd;
{
	while( cd1400_read_reg(cd, CD1400_CCR) )
		;

	cd1400_write_reg(cd, CD1400_CCR, cmd);
}

/*
 * read a value from a cd1400 register
 */
__inline u_char
cd1400_read_reg(cd, reg)
	struct cd1400 *cd;
	int reg;
{
	return(cd->cd_reg[reg]);
}

/*
 * write a value to a cd1400 register
 */
__inline void
cd1400_write_reg(cd, reg, value)
	struct cd1400 *cd;
	int reg;
	u_char value;
{
	cd->cd_reg[reg] = value;
}

/*
 * enable transmit service requests for cd1400 channel
 */
void
cd1400_enable_transmitter(cd, channel)
	struct cd1400 *cd;
	int channel;
{
	int s, srer;

	s = spltty();
	cd1400_write_reg(cd, CD1400_CAR, channel);
	srer = cd1400_read_reg(cd, CD1400_SRER);
	SET(srer, CD1400_SRER_TXRDY);
	cd1400_write_reg(cd, CD1400_SRER, srer);
	splx(s);
}

/************************************************************************
 *
 *  CD1190 Routines
 */

/* well, there are none yet */

/************************************************************************
 *
 *  Magma Routines
 *
 * magma_match		reports if we have a magma board available
 * magma_attach		attaches magma boards to the sbus
 * magma_hard		hardware level interrupt routine
 * magma_soft		software level interrupt routine
 */

int
magma_match(parent, cf, aux)
	struct device *parent;
	struct cfdata *cf;
	void *aux;
{
	struct sbus_attach_args *sa = aux;

	/* is it a magma Sp card? */
	if( strcmp(sa->sa_name, "MAGMA_Sp") != 0 )
		return(0);

	dprintf(("magma: matched `%s'\n", sa->sa_name));
	dprintf(("magma: magma_prom `%s'\n",
		getpropstring(sa->sa_node, "magma_prom")));
	dprintf(("magma: intlevels `%s'\n",
		getpropstring(sa->sa_node, "intlevels")));
	dprintf(("magma: chiprev `%s'\n",
		getpropstring(sa->sa_node, "chiprev")));
	dprintf(("magma: clock `%s'\n",
		getpropstring(sa->sa_node, "clock")));

	return (1);
}

void
magma_attach(parent, self, aux)
	struct device *parent;
	struct device *self;
	void *aux;
{
	struct sbus_attach_args *sa = aux;
	struct magma_softc *sc = (struct magma_softc *)self;
	struct magma_board_info *card = supported_cards;
	bus_space_handle_t bh;
	char *magma_prom;
	int node, chip;

	node = sa->sa_node;
	magma_prom = getpropstring(node, "magma_prom");

	/* find the card type */
	while (card->mb_name && strcmp(magma_prom, card->mb_name) != 0)
		card++;

	dprintf((" addr %p", sc));
	printf(" softpri %d:", PIL_TTY);

	if( card->mb_name == NULL ) {
		printf(" %s (unsupported)\n", magma_prom);
		return;
	}

	printf(" %s\n", card->mb_realname);

	sc->ms_board = card;
	sc->ms_ncd1400 = card->mb_ncd1400;
	sc->ms_ncd1190 = card->mb_ncd1190;

	if (sbus_bus_map(sa->sa_bustag,
			 sa->sa_slot,
			 sa->sa_offset,
			 sa->sa_size,
			 BUS_SPACE_MAP_LINEAR,
			 0, &bh) != 0) {
		printf("%s @ sbus: cannot map registers\n", self->dv_xname);
		return;
	}

	/* the SVCACK* lines are daisychained */
	sc->ms_svcackr = (caddr_t)bh + card->mb_svcackr;
	sc->ms_svcackt = (caddr_t)bh + card->mb_svcackt;
	sc->ms_svcackm = (caddr_t)bh + card->mb_svcackm;

	/* init the cd1400 chips */
	for( chip = 0 ; chip < card->mb_ncd1400 ; chip++ ) {
		struct cd1400 *cd = &sc->ms_cd1400[chip];

		cd->cd_reg = (caddr_t)bh + card->mb_cd1400[chip];

		/* XXX getpropstring(node, "clock") */
		cd->cd_clock = 25;

		/* getpropstring(node, "chiprev"); */
		/* seemingly the Magma drivers just ignore the propstring */
		cd->cd_chiprev = cd1400_read_reg(cd, CD1400_GFRCR);

		dprintf(("%s attach CD1400 %d addr %p rev %x clock %dMhz\n",
			sc->ms_dev.dv_xname, chip,
			cd->cd_reg, cd->cd_chiprev, cd->cd_clock));

		/* clear GFRCR */
		cd1400_write_reg(cd, CD1400_GFRCR, 0x00);

		/* reset whole chip */
		cd1400_write_ccr(cd, CD1400_CCR_CMDRESET | CD1400_CCR_FULLRESET);

		/* wait for revision code to be restored */
		while( cd1400_read_reg(cd, CD1400_GFRCR) != cd->cd_chiprev )
		        ;

		/* set the Prescaler Period Register to tick at 1ms */
		cd1400_write_reg(cd, CD1400_PPR,
			((cd->cd_clock * 1000000 / CD1400_PPR_PRESCALER + 500) / 1000));

		/* The LC2+1Sp card is the only card that doesn't have
		 * a CD1190 for the parallel port, but uses channel 0 of
		 * the CD1400, so we make a note of it for later and set up
		 * the CD1400 for parallel mode operation.
		 */
		if( card->mb_npar && card->mb_ncd1190 == 0 ) {
			cd1400_write_reg(cd, CD1400_GCR, CD1400_GCR_PARALLEL);
			cd->cd_parmode = 1;
		}
	}

	/* init the cd1190 chips */
	for( chip = 0 ; chip < card->mb_ncd1190 ; chip++ ) {
		struct cd1190 *cd = &sc->ms_cd1190[chip];

		cd->cd_reg = (caddr_t)bh + card->mb_cd1190[chip];
		dprintf(("%s attach CD1190 %d addr %p (failed)\n",
			self->dv_xname, chip, cd->cd_reg));
		/* XXX don't know anything about these chips yet */
	}

	sbus_establish(&sc->ms_sd, &sc->ms_dev);

	/* configure the children */
	(void)config_found(self, mtty_match, NULL);
	(void)config_found(self, mbpp_match, NULL);

	/*
	 * Establish the interrupt handlers.
	 */
	if (sa->sa_nintr == 0)
		return;		/* No interrupts to service!? */

	(void)bus_intr_establish(sa->sa_bustag, sa->sa_pri, IPL_TTY,
				 0, magma_hard, sc);
	(void)bus_intr_establish(sa->sa_bustag, PIL_TTY, IPL_SOFTSERIAL,
				 BUS_INTR_ESTABLISH_SOFTINTR,
				 magma_soft, sc);
	evcnt_attach_dynamic(&sc->ms_intrcnt, EVCNT_TYPE_INTR, NULL,
	    sc->ms_dev.dv_xname, "intr");
}

/*
 * hard interrupt routine
 *
 *  returns 1 if it handled it, otherwise 0
 *
 *  runs at interrupt priority
 */
int
magma_hard(arg)
	void *arg;
{
	struct magma_softc *sc = arg;
	struct cd1400 *cd;
	int chip, status = 0;
	int serviced = 0;
	int needsoftint = 0;

	/*
	 * check status of all the CD1400 chips
	 */
	for( chip = 0 ; chip < sc->ms_ncd1400 ; chip++ )
		status |= cd1400_read_reg(&sc->ms_cd1400[chip], CD1400_SVRR);

	if( ISSET(status, CD1400_SVRR_RXRDY) ) {
		u_char rivr = *sc->ms_svcackr;	/* enter rx service context */
		int port = rivr >> 4;

		if( rivr & (1<<3) ) {			/* parallel port */
			struct mbpp_port *mbpp;
			int n_chars;

			mbpp = &sc->ms_mbpp->ms_port[port];
			cd = mbpp->mp_cd1400;

			/* don't think we have to handle exceptions */
			n_chars = cd1400_read_reg(cd, CD1400_RDCR);
			while (n_chars--) {
				if( mbpp->mp_cnt == 0 ) {
					SET(mbpp->mp_flags, MBPPF_WAKEUP);
					needsoftint = 1;
					break;
				}
				*mbpp->mp_ptr = cd1400_read_reg(cd,CD1400_RDSR);
				mbpp->mp_ptr++;
				mbpp->mp_cnt--;
			}
		} else {				/* serial port */
			struct mtty_port *mtty;
			u_char *ptr, n_chars, line_stat;

			mtty = &sc->ms_mtty->ms_port[port];
			cd = mtty->mp_cd1400;

			if( ISSET(rivr, CD1400_RIVR_EXCEPTION) ) {
				line_stat = cd1400_read_reg(cd, CD1400_RDSR);
				n_chars = 1;
			} else { /* no exception, received data OK */
				line_stat = 0;
				n_chars = cd1400_read_reg(cd, CD1400_RDCR);
			}

			ptr = mtty->mp_rput;
			while( n_chars-- ) {
				*ptr++ = line_stat;
				*ptr++ = cd1400_read_reg(cd, CD1400_RDSR);
				if( ptr == mtty->mp_rend ) ptr = mtty->mp_rbuf;
				if( ptr == mtty->mp_rget ) {
					if( ptr == mtty->mp_rbuf )
						ptr = mtty->mp_rend;
					ptr -= 2;
					SET(mtty->mp_flags, MTTYF_RING_OVERFLOW);
					break;
				}
			}
			mtty->mp_rput = ptr;

			needsoftint = 1;
		}

		cd1400_write_reg(cd, CD1400_EOSRR, 0);	/* end service context */
		serviced = 1;
	} /* if(rx_service...) */

	if( ISSET(status, CD1400_SVRR_MDMCH) ) {
		u_char mivr = *sc->ms_svcackm;	/* enter mdm service context */
		int port = mivr >> 4;
		struct mtty_port *mtty;
		int carrier;
		u_char msvr;

		/*
		 * Handle CD (LC2+1Sp = DSR) changes.
		 */
		mtty = &sc->ms_mtty->ms_port[port];
		cd = mtty->mp_cd1400;
		msvr = cd1400_read_reg(cd, CD1400_MSVR2);
		carrier = ISSET(msvr, cd->cd_parmode ? CD1400_MSVR2_DSR : CD1400_MSVR2_CD);

		if( mtty->mp_carrier != carrier ) {
			SET(mtty->mp_flags, MTTYF_CARRIER_CHANGED);
			mtty->mp_carrier = carrier;
			needsoftint = 1;
		}

		cd1400_write_reg(cd, CD1400_EOSRR, 0);	/* end service context */
		serviced = 1;
	} /* if(mdm_service...) */

	if( ISSET(status, CD1400_SVRR_TXRDY) ) {
		u_char tivr = *sc->ms_svcackt;	/* enter tx service context */
		int port = tivr >> 4;

		if( tivr & (1<<3) ) {	/* parallel port */
			struct mbpp_port *mbpp;

			mbpp = &sc->ms_mbpp->ms_port[port];
			cd = mbpp->mp_cd1400;

			if( mbpp->mp_cnt ) {
				int count = 0;

				/* fill the fifo */
				while (mbpp->mp_cnt &&
					count++ < CD1400_PAR_FIFO_SIZE) {
					cd1400_write_reg(cd, CD1400_TDR,
							 *mbpp->mp_ptr);
					mbpp->mp_ptr++;
					mbpp->mp_cnt--;
				}
			} else {
				/*
				 * fifo is empty and we got no more data
				 * to send, so shut off interrupts and
				 * signal for a wakeup, which can't be
				 * done here in case we beat mbpp_send to
				 * the tsleep call (we are running at >spltty)
				 */
				cd1400_write_reg(cd, CD1400_SRER, 0);
				SET(mbpp->mp_flags, MBPPF_WAKEUP);
				needsoftint = 1;
			}
		} else {		/* serial port */
			struct mtty_port *mtty;
			struct tty *tp;

			mtty = &sc->ms_mtty->ms_port[port];
			cd = mtty->mp_cd1400;
			tp = mtty->mp_tty;

			if( !ISSET(mtty->mp_flags, MTTYF_STOP) ) {
				int count = 0;

				/* check if we should start/stop a break */
				if( ISSET(mtty->mp_flags, MTTYF_SET_BREAK) ) {
					cd1400_write_reg(cd, CD1400_TDR, 0);
					cd1400_write_reg(cd, CD1400_TDR, 0x81);
					/* should we delay too? */
					CLR(mtty->mp_flags, MTTYF_SET_BREAK);
					count += 2;
				}

				if( ISSET(mtty->mp_flags, MTTYF_CLR_BREAK) ) {
					cd1400_write_reg(cd, CD1400_TDR, 0);
					cd1400_write_reg(cd, CD1400_TDR, 0x83);
					CLR(mtty->mp_flags, MTTYF_CLR_BREAK);
					count += 2;
				}

				/* I don't quite fill the fifo in case the last one is a
				 * NULL which I have to double up because its the escape
				 * code for embedded transmit characters.
				 */
				while( mtty->mp_txc > 0 && count < CD1400_TX_FIFO_SIZE - 1 ) {
					u_char ch;

					ch = *mtty->mp_txp;

					mtty->mp_txc--;
					mtty->mp_txp++;

					if( ch == 0 ) {
						cd1400_write_reg(cd, CD1400_TDR, ch);
						count++;
					}

					cd1400_write_reg(cd, CD1400_TDR, ch);
					count++;
				}
			}

			/* if we ran out of work or are requested to STOP then
			 * shut off the txrdy interrupts and signal DONE to flush
			 * out the chars we have sent.
			 */
			if( mtty->mp_txc == 0 || ISSET(mtty->mp_flags, MTTYF_STOP) ) {
				register int srer;

				srer = cd1400_read_reg(cd, CD1400_SRER);
				CLR(srer, CD1400_SRER_TXRDY);
				cd1400_write_reg(cd, CD1400_SRER, srer);
				CLR(mtty->mp_flags, MTTYF_STOP);

				SET(mtty->mp_flags, MTTYF_DONE);
				needsoftint = 1;
			}
		}

		cd1400_write_reg(cd, CD1400_EOSRR, 0);	/* end service context */
		serviced = 1;
	} /* if(tx_service...) */

	/* XXX service CD1190 interrupts too
	for( chip = 0 ; chip < sc->ms_ncd1190 ; chip++ ) {
	}
	*/

	if( needsoftint ) {	/* trigger the soft interrupt */
#if defined(SUN4M)
		if( CPU_ISSUN4M )
			raise(0, PIL_TTY);
		else
#endif
			ienab_bis(IE_MSOFT);
	}

	return(serviced);
}

/*
 * magma soft interrupt handler
 *
 *  returns 1 if it handled it, 0 otherwise
 *
 *  runs at spltty()
 */
int
magma_soft(arg)
	void *arg;
{
	struct magma_softc *sc = arg;
	struct mtty_softc *mtty = sc->ms_mtty;
	struct mbpp_softc *mbpp = sc->ms_mbpp;
	int port;
	int serviced = 0;
	int s, flags;

	if (mtty == NULL)
		goto chkbpp;

	/*
	 * check the tty ports to see what needs doing
	 */
	for( port = 0 ; port < mtty->ms_nports ; port++ ) {
		struct mtty_port *mp = &mtty->ms_port[port];
		struct tty *tp = mp->mp_tty;

		if( !ISSET(tp->t_state, TS_ISOPEN) )
			continue;

		/*
		 * handle any received data
		 */
		while( mp->mp_rget != mp->mp_rput ) {
			u_char stat;
			int data;

			stat = mp->mp_rget[0];
			data = mp->mp_rget[1];
			mp->mp_rget = ((mp->mp_rget + 2) == mp->mp_rend)
				? mp->mp_rbuf : (mp->mp_rget + 2);

			if( stat & (CD1400_RDSR_BREAK | CD1400_RDSR_FE) )
				data |= TTY_FE;
			if( stat & CD1400_RDSR_PE )
				data |= TTY_PE;

			if( stat & CD1400_RDSR_OE )
				log(LOG_WARNING, "%s%x: fifo overflow\n",
				    mtty->ms_dev.dv_xname, port);

			(*tp->t_linesw->l_rint)(data, tp);
			serviced = 1;
		}

		s = splhigh();	/* block out hard interrupt routine */
		flags = mp->mp_flags;
		CLR(mp->mp_flags, MTTYF_DONE | MTTYF_CARRIER_CHANGED | MTTYF_RING_OVERFLOW);
		splx(s);	/* ok */

		if( ISSET(flags, MTTYF_CARRIER_CHANGED) ) {
			dprintf(("%s%x: cd %s\n", mtty->ms_dev.dv_xname,
				port, mp->mp_carrier ? "on" : "off"));
			(*tp->t_linesw->l_modem)(tp, mp->mp_carrier);
			serviced = 1;
		}

		if( ISSET(flags, MTTYF_RING_OVERFLOW) ) {
			log(LOG_WARNING, "%s%x: ring buffer overflow\n",
			    mtty->ms_dev.dv_xname, port);
			serviced = 1;
		}

		if( ISSET(flags, MTTYF_DONE) ) {
			ndflush(&tp->t_outq, mp->mp_txp - tp->t_outq.c_cf);
			CLR(tp->t_state, TS_BUSY);
			(*tp->t_linesw->l_start)(tp);	/* might be some more */
			serviced = 1;
		}
	} /* for(each mtty...) */


chkbpp:
	/*
	 * Check the bpp ports (if any) to see what needs doing
	 */
	if (mbpp == NULL)
		return (serviced);

	for( port = 0 ; port < mbpp->ms_nports ; port++ ) {
		struct mbpp_port *mp = &mbpp->ms_port[port];

		if( !ISSET(mp->mp_flags, MBPPF_OPEN) )
			continue;

		s = splhigh();
		flags = mp->mp_flags;
		CLR(mp->mp_flags, MBPPF_WAKEUP);
		splx(s);

		if( ISSET(flags, MBPPF_WAKEUP) ) {
			wakeup(mp);
			serviced = 1;
		}

	} /* for(each mbpp...) */

	return(serviced);
}

/************************************************************************
 *
 *  MTTY Routines
 *
 *	mtty_match		match one mtty device
 *	mtty_attach		attach mtty devices
 *	mttyopen		open mtty device
 *	mttyclose		close mtty device
 *	mttyread		read from mtty
 *	mttywrite		write to mtty
 *	mttyioctl		do ioctl on mtty
 *	mttytty			return tty pointer for mtty
 *	mttystop		stop mtty device
 *	mtty_start		start mtty device
 *	mtty_param		set mtty parameters
 *	mtty_modem_control	set modem control lines
 */

int
mtty_match(parent, cf, args)
	struct device *parent;
	struct cfdata *cf;
	void *args;
{
	struct magma_softc *sc = (struct magma_softc *)parent;

	return( args == mtty_match && sc->ms_board->mb_nser && sc->ms_mtty == NULL );
}

void
mtty_attach(parent, dev, args)
	struct device *parent;
	struct device *dev;
	void *args;
{
	struct magma_softc *sc = (struct magma_softc *)parent;
	struct mtty_softc *ms = (struct mtty_softc *)dev;
	int port, chip, chan;

	sc->ms_mtty = ms;
	dprintf((" addr %p", ms));

	for( port = 0, chip = 0, chan = 0 ; port < sc->ms_board->mb_nser ; port++ ) {
		struct mtty_port *mp = &ms->ms_port[port];
		struct tty *tp;

		mp->mp_cd1400 = &sc->ms_cd1400[chip];
		if( mp->mp_cd1400->cd_parmode && chan == 0 )
			chan = 1; /* skip channel 0 if parmode */
		mp->mp_channel = chan;

		tp = ttymalloc();
		if( tp == NULL ) break;
		tty_attach(tp);
		tp->t_oproc = mtty_start;
		tp->t_param = mtty_param;

		mp->mp_tty = tp;

		mp->mp_rbuf = malloc(MTTY_RBUF_SIZE, M_DEVBUF, M_NOWAIT);
		if( mp->mp_rbuf == NULL ) break;

		mp->mp_rend = mp->mp_rbuf + MTTY_RBUF_SIZE;

		chan = (chan + 1) % CD1400_NO_OF_CHANNELS;
		if( chan == 0 ) chip++;
	}

	ms->ms_nports = port;
	printf(": %d tty%s\n", port, port == 1 ? "" : "s");
}

/*
 * open routine. returns zero if successful, else error code
 */
int
mttyopen(dev, flags, mode, p)
	dev_t dev;
	int flags;
	int mode;
	struct proc *p;
{
	int card = MAGMA_CARD(dev);
	int port = MAGMA_PORT(dev);
	struct mtty_softc *ms;
	struct mtty_port *mp;
	struct tty *tp;
	struct cd1400 *cd;
	int error, s;

	if( card >= mtty_cd.cd_ndevs ||
	    (ms = mtty_cd.cd_devs[card]) == NULL || port >= ms->ms_nports )
		return(ENXIO);	/* device not configured */

	mp = &ms->ms_port[port];
	tp = mp->mp_tty;
	tp->t_dev = dev;

	if (ISSET(tp->t_state, TS_ISOPEN) &&
	    ISSET(tp->t_state, TS_XCLUDE) &&
	    p->p_ucred->cr_uid != 0)
		return (EBUSY);

	s = spltty();

	if( !ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) {

		/* set defaults */
		ttychars(tp);
		tp->t_iflag = TTYDEF_IFLAG;
		tp->t_oflag = TTYDEF_OFLAG;
		tp->t_cflag = TTYDEF_CFLAG;
		if( ISSET(mp->mp_openflags, TIOCFLAG_CLOCAL) )
			SET(tp->t_cflag, CLOCAL);
		if( ISSET(mp->mp_openflags, TIOCFLAG_CRTSCTS) )
			SET(tp->t_cflag, CRTSCTS);
		if( ISSET(mp->mp_openflags, TIOCFLAG_MDMBUF) )
			SET(tp->t_cflag, MDMBUF);
		tp->t_lflag = TTYDEF_LFLAG;
		tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;

		/* init ring buffer */
		mp->mp_rput = mp->mp_rget = mp->mp_rbuf;

		/* reset CD1400 channel */
		cd = mp->mp_cd1400;
		cd1400_write_reg(cd, CD1400_CAR, mp->mp_channel);
		cd1400_write_ccr(cd, CD1400_CCR_CMDRESET);

		/* encode the port number in top half of LIVR */
		cd1400_write_reg(cd, CD1400_LIVR, port << 4 );

		/* sets parameters and raises DTR */
		(void)mtty_param(tp, &tp->t_termios);

		/* set tty watermarks */
		ttsetwater(tp);

		/* enable service requests */
		cd1400_write_reg(cd, CD1400_SRER,
				 CD1400_SRER_RXDATA | CD1400_SRER_MDMCH);

		/* tell the tty about the carrier status */
		if( ISSET(mp->mp_openflags, TIOCFLAG_SOFTCAR) ||
		    mp->mp_carrier )
			SET(tp->t_state, TS_CARR_ON);
		else
			CLR(tp->t_state, TS_CARR_ON);
	}
	splx(s);

	error = ttyopen(tp, MTTY_DIALOUT(dev), ISSET(flags, O_NONBLOCK));
	if (error != 0)
		goto bad;

	error = (*tp->t_linesw->l_open)(dev, tp);
	if (error != 0)
		goto bad;

bad:
	if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) {
		/*
		 * We failed to open the device, and nobody else had it opened.
		 * Clean up the state as appropriate.
		 */
		/* XXX - do that here */
	}

	return (error);
}

/*
 * close routine. returns zero if successful, else error code
 */
int
mttyclose(dev, flag, mode, p)
	dev_t dev;
	int flag;
	int mode;
	struct proc *p;
{
	struct mtty_softc *ms = mtty_cd.cd_devs[MAGMA_CARD(dev)];
	struct mtty_port *mp = &ms->ms_port[MAGMA_PORT(dev)];
	struct tty *tp = mp->mp_tty;
	int s;

	(*tp->t_linesw->l_close)(tp, flag);
	ttyclose(tp);

	s = spltty();

	/* if HUPCL is set, and the tty is no longer open
	 * shut down the port
	 */
	if( ISSET(tp->t_cflag, HUPCL) || !ISSET(tp->t_state, TS_ISOPEN) ) {
		/* XXX wait until FIFO is empty before turning off the channel
		struct cd1400 *cd = mp->mp_cd1400;
		*/

		/* drop DTR and RTS */
		(void)mtty_modem_control(mp, 0, DMSET);

		/* turn off the channel
		cd1400_write_reg(cd, CD1400_CAR, mp->mp_channel);
		cd1400_write_ccr(cd, CD1400_CCR_CMDRESET);
		*/
	}

	splx(s);

	return(0);
}

/*
 * Read routine
 */
int
mttyread(dev, uio, flags)
	dev_t dev;
	struct uio *uio;
	int flags;
{
	struct mtty_softc *ms = mtty_cd.cd_devs[MAGMA_CARD(dev)];
	struct mtty_port *mp = &ms->ms_port[MAGMA_PORT(dev)];
	struct tty *tp = mp->mp_tty;

	return( (*tp->t_linesw->l_read)(tp, uio, flags) );
}

/*
 * Write routine
 */
int
mttywrite(dev, uio, flags)
	dev_t dev;
	struct uio *uio;
	int flags;
{
	struct mtty_softc *ms = mtty_cd.cd_devs[MAGMA_CARD(dev)];
	struct mtty_port *mp = &ms->ms_port[MAGMA_PORT(dev)];
	struct tty *tp = mp->mp_tty;

	return( (*tp->t_linesw->l_write)(tp, uio, flags) );
}

/*
 * Poll routine
 */
int
mttypoll(dev, events, p)
	dev_t dev;
	int events;
	struct proc *p;
{
	struct mtty_softc *ms = mtty_cd.cd_devs[MAGMA_CARD(dev)];
	struct mtty_port *mp = &ms->ms_port[MAGMA_PORT(dev)];
	struct tty *tp = mp->mp_tty;

	return ((*tp->t_linesw->l_poll)(tp, events, p));
}

/*
 * return tty pointer
 */
struct tty *
mttytty(dev)
	dev_t dev;
{
	struct mtty_softc *ms = mtty_cd.cd_devs[MAGMA_CARD(dev)];
	struct mtty_port *mp = &ms->ms_port[MAGMA_PORT(dev)];

	return(mp->mp_tty);
}

/*
 * ioctl routine
 */
int
mttyioctl(dev, cmd, data, flags, p)
	dev_t dev;
	u_long cmd;
	caddr_t data;
	int flags;
	struct proc *p;
{
	struct mtty_softc *ms = mtty_cd.cd_devs[MAGMA_CARD(dev)];
	struct mtty_port *mp = &ms->ms_port[MAGMA_PORT(dev)];
	struct tty *tp = mp->mp_tty;
	int error;

	error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flags, p);
	if( error >= 0 ) return(error);

	error = ttioctl(tp, cmd, data, flags, p);
	if( error >= 0 ) return(error);

	error = 0;

	switch(cmd) {
	case TIOCSBRK:	/* set break */
		SET(mp->mp_flags, MTTYF_SET_BREAK);
		cd1400_enable_transmitter(mp->mp_cd1400, mp->mp_channel);
		break;

	case TIOCCBRK:	/* clear break */
		SET(mp->mp_flags, MTTYF_CLR_BREAK);
		cd1400_enable_transmitter(mp->mp_cd1400, mp->mp_channel);
		break;

	case TIOCSDTR:	/* set DTR */
		mtty_modem_control(mp, TIOCM_DTR, DMBIS);
		break;

	case TIOCCDTR:	/* clear DTR */
		mtty_modem_control(mp, TIOCM_DTR, DMBIC);
		break;

	case TIOCMSET:	/* set modem lines */
		mtty_modem_control(mp, *((int *)data), DMSET);
		break;

	case TIOCMBIS:	/* bit set modem lines */
		mtty_modem_control(mp, *((int *)data), DMBIS);
		break;

	case TIOCMBIC:	/* bit clear modem lines */
		mtty_modem_control(mp, *((int *)data), DMBIC);
		break;

	case TIOCMGET:	/* get modem lines */
		*((int *)data) = mtty_modem_control(mp, 0, DMGET);
		break;

	case TIOCGFLAGS:
		*((int *)data) = mp->mp_openflags;
		break;

	case TIOCSFLAGS:
		if( suser(p->p_ucred, &p->p_acflag) )
			error = EPERM;
		else
			mp->mp_openflags = *((int *)data) &
				(TIOCFLAG_SOFTCAR | TIOCFLAG_CLOCAL |
				TIOCFLAG_CRTSCTS | TIOCFLAG_MDMBUF);
		break;

	default:
		error = ENOTTY;
	}

	return(error);
}

/*
 * Stop output, e.g., for ^S or output flush.
 */
void
mttystop(tp, flags)
	struct tty *tp;
	int flags;
{
	struct mtty_softc *ms = mtty_cd.cd_devs[MAGMA_CARD(tp->t_dev)];
	struct mtty_port *mp = &ms->ms_port[MAGMA_PORT(tp->t_dev)];
	int s;

	s = spltty();

	if( ISSET(tp->t_state, TS_BUSY) ) {
		if( !ISSET(tp->t_state, TS_TTSTOP) )
			SET(tp->t_state, TS_FLUSH);

		/*
		 * the transmit interrupt routine will disable transmit when it
		 * notices that MTTYF_STOP has been set.
		 */
		SET(mp->mp_flags, MTTYF_STOP);
	}

	splx(s);
}

/*
 * Start output, after a stop.
 */
void
mtty_start(tp)
	struct tty *tp;
{
	struct mtty_softc *ms = mtty_cd.cd_devs[MAGMA_CARD(tp->t_dev)];
	struct mtty_port *mp = &ms->ms_port[MAGMA_PORT(tp->t_dev)];
	int s;

	s = spltty();

	/* we only need to do something if we are not already busy
	 * or delaying or stopped
	 */
	if( !ISSET(tp->t_state, TS_TTSTOP | TS_TIMEOUT | TS_BUSY) ) {

		/* if we are sleeping and output has drained below
		 * low water mark, awaken
		 */
		if( tp->t_outq.c_cc <= tp->t_lowat ) {
			if( ISSET(tp->t_state, TS_ASLEEP) ) {
				CLR(tp->t_state, TS_ASLEEP);
				wakeup(&tp->t_outq);
			}

			selwakeup(&tp->t_wsel);
		}

		/* if something to send, start transmitting
		 */
		if( tp->t_outq.c_cc ) {
			mp->mp_txc = ndqb(&tp->t_outq, 0);
			mp->mp_txp = tp->t_outq.c_cf;
			SET(tp->t_state, TS_BUSY);
			cd1400_enable_transmitter(mp->mp_cd1400, mp->mp_channel);
		}
	}

	splx(s);
}

/*
 * set/get modem line status
 *
 * bits can be: TIOCM_DTR, TIOCM_RTS, TIOCM_CTS, TIOCM_CD, TIOCM_RI, TIOCM_DSR
 *
 * note that DTR and RTS lines are exchanged, and that DSR is
 * not available on the LC2+1Sp card (used as CD)
 *
 * only let them fiddle with RTS if CRTSCTS is not enabled
 */
int
mtty_modem_control(mp, bits, howto)
	struct mtty_port *mp;
	int bits;
	int howto;
{
	struct cd1400 *cd = mp->mp_cd1400;
	struct tty *tp = mp->mp_tty;
	int s, msvr;

	s = spltty();

	cd1400_write_reg(cd, CD1400_CAR, mp->mp_channel);

	switch(howto) {
	case DMGET:	/* get bits */
		bits = 0;

		bits |= TIOCM_LE;

		msvr = cd1400_read_reg(cd, CD1400_MSVR1);
		if( msvr & CD1400_MSVR1_RTS ) bits |= TIOCM_DTR;

		msvr = cd1400_read_reg(cd, CD1400_MSVR2);
		if( msvr & CD1400_MSVR2_DTR ) bits |= TIOCM_RTS;
		if( msvr & CD1400_MSVR2_CTS ) bits |= TIOCM_CTS;
		if( msvr & CD1400_MSVR2_RI ) bits |= TIOCM_RI;
		if( msvr & CD1400_MSVR2_DSR ) bits |= (cd->cd_parmode ? TIOCM_CD : TIOCM_DSR);
		if( msvr & CD1400_MSVR2_CD ) bits |= (cd->cd_parmode ? 0 : TIOCM_CD);

		break;

	case DMSET:	/* reset bits */
		if( !ISSET(tp->t_cflag, CRTSCTS) )
			cd1400_write_reg(cd, CD1400_MSVR2, ((bits & TIOCM_RTS) ? CD1400_MSVR2_DTR : 0));

		cd1400_write_reg(cd, CD1400_MSVR1, ((bits & TIOCM_DTR) ? CD1400_MSVR1_RTS : 0));

		break;

	case DMBIS:	/* set bits */
		if( (bits & TIOCM_RTS) && !ISSET(tp->t_cflag, CRTSCTS) )
			cd1400_write_reg(cd, CD1400_MSVR2, CD1400_MSVR2_DTR);

		if( bits & TIOCM_DTR )
			cd1400_write_reg(cd, CD1400_MSVR1, CD1400_MSVR1_RTS);

		break;

	case DMBIC:	/* clear bits */
		if( (bits & TIOCM_RTS) && !ISSET(tp->t_cflag, CRTSCTS) )
			cd1400_write_reg(cd, CD1400_MSVR2, 0);

		if( bits & TIOCM_DTR )
			cd1400_write_reg(cd, CD1400_MSVR1, 0);

		break;
	}

	splx(s);
	return(bits);
}

/*
 * Set tty parameters, returns error or 0 on success
 */
int
mtty_param(tp, t)
	struct tty *tp;
	struct termios *t;
{
	struct mtty_softc *ms = mtty_cd.cd_devs[MAGMA_CARD(tp->t_dev)];
	struct mtty_port *mp = &ms->ms_port[MAGMA_PORT(tp->t_dev)];
	struct cd1400 *cd = mp->mp_cd1400;
	int rbpr, tbpr, rcor, tcor;
	u_char mcor1 = 0, mcor2 = 0;
	int s, opt;

	if( t->c_ospeed && cd1400_compute_baud(t->c_ospeed, cd->cd_clock, &tcor, &tbpr) )
		return(EINVAL);

	if( t->c_ispeed && cd1400_compute_baud(t->c_ispeed, cd->cd_clock, &rcor, &rbpr) )
		return(EINVAL);

	s = spltty();

	/* hang up the line if ospeed is zero, else raise DTR */
	(void)mtty_modem_control(mp, TIOCM_DTR, (t->c_ospeed == 0 ? DMBIC : DMBIS));

	/* select channel, done in mtty_modem_control() */
	/* cd1400_write_reg(cd, CD1400_CAR, mp->mp_channel); */

	/* set transmit speed */
	if( t->c_ospeed ) {
		cd1400_write_reg(cd, CD1400_TCOR, tcor);
		cd1400_write_reg(cd, CD1400_TBPR, tbpr);
	}

	/* set receive speed */
	if( t->c_ispeed ) {
		cd1400_write_reg(cd, CD1400_RCOR, rcor);
		cd1400_write_reg(cd, CD1400_RBPR, rbpr);
	}

	/* enable transmitting and receiving on this channel */
	opt = CD1400_CCR_CMDCHANCTL | CD1400_CCR_XMTEN | CD1400_CCR_RCVEN;
	cd1400_write_ccr(cd, opt);

	/* set parity, data and stop bits */
	opt = 0;
	if( ISSET(t->c_cflag, PARENB) )
		opt |= (ISSET(t->c_cflag, PARODD) ? CD1400_COR1_PARODD : CD1400_COR1_PARNORMAL);

	if( !ISSET(t->c_iflag, INPCK) )
		opt |= CD1400_COR1_NOINPCK; /* no parity checking */

	if( ISSET(t->c_cflag, CSTOPB) )
		opt |= CD1400_COR1_STOP2;

	switch( t->c_cflag & CSIZE ) {
	case CS5:
		opt |= CD1400_COR1_CS5;
		break;

	case CS6:
		opt |= CD1400_COR1_CS6;
		break;

	case CS7:
		opt |= CD1400_COR1_CS7;
		break;

	default:
		opt |= CD1400_COR1_CS8;
		break;
	}

	cd1400_write_reg(cd, CD1400_COR1, opt);

	/*
	 * enable Embedded Transmit Commands (for breaks)
	 * use the CD1400 automatic CTS flow control if CRTSCTS is set
	 */
	opt = CD1400_COR2_ETC;
	if( ISSET(t->c_cflag, CRTSCTS) ) opt |= CD1400_COR2_CCTS_OFLOW;
	cd1400_write_reg(cd, CD1400_COR2, opt);

	cd1400_write_reg(cd, CD1400_COR3, MTTY_RX_FIFO_THRESHOLD);

	cd1400_write_ccr(cd, CD1400_CCR_CMDCORCHG | CD1400_CCR_COR1 | CD1400_CCR_COR2 | CD1400_CCR_COR3);

	cd1400_write_reg(cd, CD1400_COR4, CD1400_COR4_PFO_EXCEPTION);
	cd1400_write_reg(cd, CD1400_COR5, 0);

	/*
	 * if automatic RTS handshaking enabled, set DTR threshold
	 * (RTS and DTR lines are switched, CD1400 thinks its DTR)
	 */
	if( ISSET(t->c_cflag, CRTSCTS) )
		mcor1 = MTTY_RX_DTR_THRESHOLD;

	/* set up `carrier detect' interrupts */
	if( cd->cd_parmode ) {
		SET(mcor1, CD1400_MCOR1_DSRzd);
		SET(mcor2, CD1400_MCOR2_DSRod);
	} else {
		SET(mcor1, CD1400_MCOR1_CDzd);
		SET(mcor2, CD1400_MCOR2_CDod);
	}

	cd1400_write_reg(cd, CD1400_MCOR1, mcor1);
	cd1400_write_reg(cd, CD1400_MCOR2, mcor2);

	/* receive timeout 2ms */
	cd1400_write_reg(cd, CD1400_RTPR, 2);

	splx(s);
	return(0);
}

/************************************************************************
 *
 *  MBPP Routines
 *
 *	mbpp_match	match one mbpp device
 *	mbpp_attach	attach mbpp devices
 *	mbppopen	open mbpp device
 *	mbppclose	close mbpp device
 *	mbppread	read from mbpp
 *	mbppwrite	write to mbpp
 *	mbppioctl	do ioctl on mbpp
 *	mbppselect	do select on mbpp
 *	mbpp_rw		general rw routine
 *	mbpp_timeout	rw timeout
 *	mbpp_start	rw start after delay
 *	mbpp_send	send data
 *	mbpp_recv	recv data
 */

int
mbpp_match(parent, cf, args)
	struct device *parent;
	struct cfdata *cf;
	void *args;
{
	struct magma_softc *sc = (struct magma_softc *)parent;

	return( args == mbpp_match && sc->ms_board->mb_npar && sc->ms_mbpp == NULL );
}

void
mbpp_attach(parent, dev, args)
	struct device *parent;
	struct device *dev;
	void *args;
{
	struct magma_softc *sc = (struct magma_softc *)parent;
	struct mbpp_softc *ms = (struct mbpp_softc *)dev;
	struct mbpp_port *mp;
	int port;

	sc->ms_mbpp = ms;
	dprintf((" addr %p", ms));

	for( port = 0 ; port < sc->ms_board->mb_npar ; port++ ) {
		mp = &ms->ms_port[port];

		callout_init(&mp->mp_timeout_ch);
		callout_init(&mp->mp_start_ch);

		if( sc->ms_ncd1190 )
			mp->mp_cd1190 = &sc->ms_cd1190[port];
		else
			mp->mp_cd1400 = &sc->ms_cd1400[0];
	}

	ms->ms_nports = port;
	printf(": %d port%s\n", port, port == 1 ? "" : "s");
}

/*
 * open routine. returns zero if successful, else error code
 */
int
mbppopen(dev, flags, mode, p)
	dev_t dev;
	int flags;
	int mode;
	struct proc *p;
{
	int card = MAGMA_CARD(dev);
	int port = MAGMA_PORT(dev);
	struct mbpp_softc *ms;
	struct mbpp_port *mp;
	int s;

	if( card >= mbpp_cd.cd_ndevs ||
	    (ms = mbpp_cd.cd_devs[card]) == NULL || port >= ms->ms_nports )
		return(ENXIO);

	mp = &ms->ms_port[port];

	s = spltty();
	if( ISSET(mp->mp_flags, MBPPF_OPEN) ) {
		splx(s);
		return(EBUSY);
	}
	SET(mp->mp_flags, MBPPF_OPEN);
	splx(s);

	/* set defaults */
	mp->mp_burst = MBPP_BURST;
	mp->mp_timeout = mbpp_mstohz(MBPP_TIMEOUT);
	mp->mp_delay = mbpp_mstohz(MBPP_DELAY);

	/* init chips */
	if( mp->mp_cd1400 ) {	/* CD1400 */
		struct cd1400 *cd = mp->mp_cd1400;

		/* set up CD1400 channel */
		s = spltty();
		cd1400_write_reg(cd, CD1400_CAR, 0);
		cd1400_write_ccr(cd, CD1400_CCR_CMDRESET);
		cd1400_write_reg(cd, CD1400_LIVR, (1<<3));
		splx(s);
	} else {		/* CD1190 */
		mp->mp_flags = 0;
		return (ENXIO);
	}

	return (0);
}

/*
 * close routine. returns zero if successful, else error code
 */
int
mbppclose(dev, flag, mode, p)
	dev_t dev;
	int flag;
	int mode;
	struct proc *p;
{
	struct mbpp_softc *ms = mbpp_cd.cd_devs[MAGMA_CARD(dev)];
	struct mbpp_port *mp = &ms->ms_port[MAGMA_PORT(dev)];

	mp->mp_flags = 0;
	return(0);
}

/*
 * Read routine
 */
int
mbppread(dev, uio, flags)
	dev_t dev;
	struct uio *uio;
	int flags;
{

	return( mbpp_rw(dev, uio) );
}

/*
 * Write routine
 */
int
mbppwrite(dev, uio, flags)
	dev_t dev;
	struct uio *uio;
	int flags;
{

	return( mbpp_rw(dev, uio) );
}

/*
 * ioctl routine
 */
int
mbppioctl(dev, cmd, data, flags, p)
	dev_t dev;
	u_long cmd;
	caddr_t data;
	int flags;
	struct proc *p;
{
	struct mbpp_softc *ms = mbpp_cd.cd_devs[MAGMA_CARD(dev)];
	struct mbpp_port *mp = &ms->ms_port[MAGMA_PORT(dev)];
	struct mbpp_param *bp;
	int error = 0;
	int s;

	switch(cmd) {
	case MBPPIOCSPARAM:
		bp = (struct mbpp_param *)data;
		if( bp->bp_burst < MBPP_BURST_MIN || bp->bp_burst > MBPP_BURST_MAX ||
		    bp->bp_delay < MBPP_DELAY_MIN || bp->bp_delay > MBPP_DELAY_MIN ) {
			error = EINVAL;
		} else {
			mp->mp_burst = bp->bp_burst;
			mp->mp_timeout = mbpp_mstohz(bp->bp_timeout);
			mp->mp_delay = mbpp_mstohz(bp->bp_delay);
		}
		break;
	case MBPPIOCGPARAM:
		bp = (struct mbpp_param *)data;
		bp->bp_burst = mp->mp_burst;
		bp->bp_timeout = mbpp_hztoms(mp->mp_timeout);
		bp->bp_delay = mbpp_hztoms(mp->mp_delay);
		break;
	case MBPPIOCGSTAT:
		/* XXX make this more generic */
		s = spltty();
		cd1400_write_reg(mp->mp_cd1400, CD1400_CAR, 0);
		*(int *)data = cd1400_read_reg(mp->mp_cd1400, CD1400_PSVR);
		splx(s);
		break;
	default:
		error = ENOTTY;
	}

	return(error);
}

/*
 * poll routine
 */
int
mbpppoll(dev, rw, p)
	dev_t dev;
	int rw;
	struct proc *p;
{

	return(ENODEV);
}

int
mbpp_rw(dev, uio)
	dev_t dev;
	struct uio *uio;
{
	int card = MAGMA_CARD(dev);
	int port = MAGMA_PORT(dev);
	struct mbpp_softc *ms = mbpp_cd.cd_devs[card];
	struct mbpp_port *mp = &ms->ms_port[port];
	caddr_t buffer, ptr;
	int buflen, cnt, len;
	int s, error = 0;
	int gotdata = 0;

	if( uio->uio_resid == 0 )
		return(0);

	buflen = min(uio->uio_resid, mp->mp_burst);
	buffer = malloc(buflen, M_DEVBUF, M_WAITOK);
	if( buffer == NULL )
		return(ENOMEM);

	SET(mp->mp_flags, MBPPF_UIO);

	/*
	 * start timeout, if needed
	 */
	if( mp->mp_timeout > 0 ) {
		SET(mp->mp_flags, MBPPF_TIMEOUT);
		callout_reset(&mp->mp_timeout_ch, mp->mp_timeout,
		    mbpp_timeout, mp);
	}

	len = cnt = 0;
	while( uio->uio_resid > 0 ) {
		len = min(buflen, uio->uio_resid);
		ptr = buffer;

		if( uio->uio_rw == UIO_WRITE ) {
			error = uiomove(ptr, len, uio);
			if( error ) break;
		}
again:		/* goto bad */
		/* timed out?  */
		if( !ISSET(mp->mp_flags, MBPPF_UIO) )
			break;

		/*
		 * perform the operation
		 */
		if( uio->uio_rw == UIO_WRITE ) {
			cnt = mbpp_send(mp, ptr, len);
		} else {
			cnt = mbpp_recv(mp, ptr, len);
		}

		if( uio->uio_rw == UIO_READ ) {
			if( cnt ) {
				error = uiomove(ptr, cnt, uio);
				if( error ) break;
				gotdata++;
			}
			else if( gotdata )	/* consider us done */
				break;
		}

		/* timed out?  */
		if( !ISSET(mp->mp_flags, MBPPF_UIO) )
			break;

		/*
		 * poll delay?
		 */
		if( mp->mp_delay > 0 ) {
			s = splsoftclock();
			SET(mp->mp_flags, MBPPF_DELAY);
			callout_reset(&mp->mp_start_ch, mp->mp_delay,
			    mbpp_start, mp);
			error = tsleep(mp, PCATCH | PZERO, "mbppdelay", 0);
			splx(s);
			if( error ) break;
		}

		/*
		 * don't call uiomove again until we used all the data we grabbed
		 */
		if( uio->uio_rw == UIO_WRITE && cnt != len ) {
			ptr += cnt;
			len -= cnt;
			cnt = 0;
			goto again;
		}
	}

	/*
	 * clear timeouts
	 */
	s = splsoftclock();
	if( ISSET(mp->mp_flags, MBPPF_TIMEOUT) ) {
		callout_stop(&mp->mp_timeout_ch);
		CLR(mp->mp_flags, MBPPF_TIMEOUT);
	}
	if( ISSET(mp->mp_flags, MBPPF_DELAY) ) {
		callout_stop(&mp->mp_start_ch);
		CLR(mp->mp_flags, MBPPF_DELAY);
	}
	splx(s);

	/*
	 * adjust for those chars that we uiomoved but never actually wrote
	 */
	if( uio->uio_rw == UIO_WRITE && cnt != len ) {
		uio->uio_resid += (len - cnt);
	}

	free(buffer, M_DEVBUF);
	return(error);
}

void
mbpp_timeout(arg)
	void *arg;
{
	struct mbpp_port *mp = arg;

	CLR(mp->mp_flags, MBPPF_UIO | MBPPF_TIMEOUT);
	wakeup(mp);
}

void
mbpp_start(arg)
	void *arg;
{
	struct mbpp_port *mp = arg;

	CLR(mp->mp_flags, MBPPF_DELAY);
	wakeup(mp);
}

int
mbpp_send(mp, ptr, len)
	struct mbpp_port *mp;
	caddr_t ptr;
	int len;
{
	int s;
	struct cd1400 *cd = mp->mp_cd1400;

	/* set up io information */
	mp->mp_ptr = ptr;
	mp->mp_cnt = len;

	/* start transmitting */
	s = spltty();
	if( cd ) {
		cd1400_write_reg(cd, CD1400_CAR, 0);

		/* output strobe width ~1microsecond */
		cd1400_write_reg(cd, CD1400_TBPR, 10);

		/* enable channel */
		cd1400_write_ccr(cd, CD1400_CCR_CMDCHANCTL | CD1400_CCR_XMTEN);
		cd1400_write_reg(cd, CD1400_SRER, CD1400_SRER_TXRDY);
	}

	/* ZZzzz... */
	tsleep(mp, PCATCH | PZERO, "mbpp_send", 0);

	/* stop transmitting */
	if( cd ) {
		cd1400_write_reg(cd, CD1400_CAR, 0);

		/* disable transmitter */
		cd1400_write_reg(cd, CD1400_SRER, 0);
		cd1400_write_ccr(cd, CD1400_CCR_CMDCHANCTL | CD1400_CCR_XMTDIS);

		/* flush fifo */
		cd1400_write_ccr(cd, CD1400_CCR_CMDRESET | CD1400_CCR_FTF);
	}
	splx(s);

	/* return number of chars sent */
	return(len - mp->mp_cnt);
}

int
mbpp_recv(mp, ptr, len)
	struct mbpp_port *mp;
	caddr_t ptr;
	int len;
{
	int s;
	struct cd1400 *cd = mp->mp_cd1400;

	/* set up io information */
	mp->mp_ptr = ptr;
	mp->mp_cnt = len;

	/* start receiving */
	s = spltty();
	if( cd ) {
	int rcor, rbpr;

		cd1400_write_reg(cd, CD1400_CAR, 0);

		/* input strobe at 100kbaud (10microseconds) */
		cd1400_compute_baud(100000, cd->cd_clock, &rcor, &rbpr);
		cd1400_write_reg(cd, CD1400_RCOR, rcor);
		cd1400_write_reg(cd, CD1400_RBPR, rbpr);

		/* rx threshold */
		cd1400_write_reg(cd, CD1400_COR3, MBPP_RX_FIFO_THRESHOLD);
		cd1400_write_ccr(cd, CD1400_CCR_CMDCORCHG | CD1400_CCR_COR3);

		/* enable channel */
		cd1400_write_ccr(cd, CD1400_CCR_CMDCHANCTL | CD1400_CCR_RCVEN);
		cd1400_write_reg(cd, CD1400_SRER, CD1400_SRER_RXDATA);
	}

	/* ZZzzz... */
	tsleep(mp, PCATCH | PZERO, "mbpp_recv", 0);

	/* stop receiving */
	if( cd ) {
		cd1400_write_reg(cd, CD1400_CAR, 0);

		/* disable receiving */
		cd1400_write_reg(cd, CD1400_SRER, 0);
		cd1400_write_ccr(cd, CD1400_CCR_CMDCHANCTL | CD1400_CCR_RCVDIS);
	}
	splx(s);

	/* return number of chars received */
	return(len - mp->mp_cnt);
}

int
mbpp_hztoms(h)
	int h;
{
	int m = h;

	if( m > 0 )
		m = m * 1000 / hz;
	return(m);
}

int
mbpp_mstohz(m)
	int m;
{
	int h = m;

	if( h > 0 ) {
		h = h * hz / 1000;
		if( h == 0 )
			h = 1000 / hz;
	}
	return(h);
}

#endif /* NMAGMA */