SAB82532 driver (missing console stuff, but working as a generic tty

device).  Based on datasheet from Infineon (another datasheet with
non-trivial errors) and info from the linux driver for same chip.

1 files changed, 1036 insertions, 0 deletions

diff --git a/sys/arch/sparc64/dev/sab.c b/sys/arch/sparc64/dev/sab.c
new file mode 100644
index 00000000000..bee1220a567
--- /dev/null
+++ b/sys/arch/sparc64/dev/sab.c
@@ -0,0 +1,1036 @@
+/*	$OpenBSD: sab.c,v 1.1 2001/10/28 02:19:16 jason Exp $	*/
+
+/*
+ * Copyright (c) 2001 Jason L. Wright (jason@thought.net)
+ * 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 Jason L. Wright
+ * 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.
+ */
+
+/*
+ * SAB82532 Dual UART driver
+ */
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/device.h>
+#include <sys/conf.h>
+#include <sys/file.h>
+#include <sys/ioctl.h>
+#include <sys/kernel.h>
+#include <sys/proc.h>
+#include <sys/tty.h>
+#include <sys/time.h>
+#include <sys/syslog.h>
+
+#include <machine/autoconf.h>
+#include <machine/openfirm.h>
+#include <machine/bsd_openprom.h>
+#include <machine/conf.h>
+#include <machine/cpu.h>
+#include <machine/eeprom.h>
+#include <machine/psl.h>
+
+#include <dev/cons.h>
+#include <ddb/db_output.h>
+
+#include <sparc64/dev/ebusreg.h>
+#include <sparc64/dev/ebusvar.h>
+#include <sparc64/dev/cons.h>
+#include <sparc64/dev/sab82532reg.h>
+
+#define	SAB_CARD(x)	((minor(x) >> 6) & 3)
+#define	SAB_PORT(x)	(minor(x) & 7)
+#define	SAB_DIALOUT(x)	(minor(x) & 0x10)
+#define	SABTTY_RBUF_SIZE	1024	/* must be divisible by 2 */
+
+struct sab_softc {
+	struct device		sc_dv;
+	struct intrhand *	sc_ih;
+	bus_space_tag_t		sc_bt;
+	bus_space_handle_t	sc_bh;
+	struct sabtty_softc *	sc_child[SAB_NCHAN];
+	u_int			sc_nchild;
+	void *			sc_softintr;
+};
+
+struct sabtty_attach_args {
+	u_int sbt_portno;
+};
+
+struct sabtty_softc {
+	struct device		sc_dv;
+	struct sab_softc *	sc_parent;
+	bus_space_tag_t		sc_bt;
+	bus_space_handle_t	sc_bh;
+	struct tty *		sc_tty;
+	u_int			sc_portno;
+	u_int8_t		sc_pvr_dtr, sc_pvr_dsr;
+	u_int8_t		sc_imr0, sc_imr1;
+	int			sc_openflags;
+	u_char *		sc_txp;
+	int			sc_txc;
+	int			sc_flags;
+#define SABTTYF_STOP		0x01
+#define	SABTTYF_DONE		0x02
+#define	SABTTYF_RINGOVERFLOW	0x04
+#define	SABTTYF_CDCHG		0x08
+	u_int8_t		sc_rbuf[SABTTY_RBUF_SIZE];
+	u_int8_t		*sc_rend, *sc_rput, *sc_rget;
+};
+
+#define	SAB_READ(sc,r)		\
+    bus_space_read_1((sc)->sc_bt, (sc)->sc_bh, (r))
+#define	SAB_WRITE(sc,r,v)	\
+    bus_space_write_1((sc)->sc_bt, (sc)->sc_bh, (r), (v))
+
+int sab_match __P((struct device *, void *, void *));
+void sab_attach __P((struct device *, struct device *, void *));
+int sab_print __P((void *, const char *));
+int sab_intr __P((void *));
+void sab_softintr __P((void *));
+
+int sabtty_match __P((struct device *, void *, void *));
+void sabtty_attach __P((struct device *, struct device *, void *));
+void sabtty_start __P((struct tty *));
+int sabtty_param __P((struct tty *, struct termios *));
+int sabtty_intr __P((struct sabtty_softc *, int *));
+void sabtty_softintr __P((struct sabtty_softc *));
+int sabtty_mdmctrl __P((struct sabtty_softc *, int, int));
+void sabtty_cec_wait __P((struct sabtty_softc *));
+void sabtty_tec_wait __P((struct sabtty_softc *));
+void sabtty_reset __P((struct sabtty_softc *));
+void sabtty_flush __P((struct sabtty_softc *));
+int sabtty_speed __P((int));
+
+int sabttyopen __P((dev_t, int, int, struct proc *));
+int sabttyclose __P((dev_t, int, int, struct proc *));
+int sabttyread __P((dev_t, struct uio *, int));
+int sabttywrite __P((dev_t, struct uio *, int));
+int sabttyioctl __P((dev_t, u_long, caddr_t, int, struct proc *));
+int sabttystop __P((struct tty *, int));
+struct tty *sabttytty __P((dev_t));
+
+struct cfattach sab_ca = {
+	sizeof(struct sab_softc), sab_match, sab_attach
+};
+
+struct cfdriver sab_cd = {
+	NULL, "sab", DV_DULL
+};
+
+struct cfattach sabtty_ca = {
+	sizeof(struct sabtty_softc), sabtty_match, sabtty_attach
+};
+
+struct cfdriver sabtty_cd = {
+	NULL, "sabtty", DV_TTY
+};
+
+struct sabtty_rate {
+	int baud;
+	int n, m;
+};
+
+struct sabtty_rate sabtty_baudtable[] = {
+	{      50,	35,     10 },
+	{      75,	47,	9 },
+	{     110,	32,	9 },
+	{     134,	53,	8 },
+	{     150,	47,	8 },
+	{     200,	35,	8 },
+	{     300,	47,	7 },
+	{     600,	47,	6 },
+	{    1200,	47,	5 },
+	{    1800,	31,	5 },
+	{    2400,	47,	4 },
+	{    4800,	47,	3 },
+	{    9600,	47,	2 },
+	{   19200,	47,	1 },
+	{   38400,	23,	1 },
+	{   57600,	15,	1 },
+	{  115200,	 7,	1 },
+	{  230400,	 3,	1 },
+	{  460800,	 1,	1 },
+	{   76800,	11,	1 },
+	{  153600,	 5,	1 },
+	{  307200,	 3,	1 },
+	{  614400,	 3,	0 },
+	{  921600,	 0,	1 },
+};
+
+int
+sab_match(parent, match, aux)
+	struct device *parent;
+	void *match, *aux;
+{
+	struct ebus_attach_args *ea = aux;
+
+	if (strcmp(ea->ea_name, "se") == 0)
+		return (1);
+	return (0);
+}
+
+void
+sab_attach(parent, self, aux)
+	struct device *parent;
+	struct device *self;
+	void *aux;
+{
+	struct sab_softc *sc = (struct sab_softc *)self;
+	struct ebus_attach_args *ea = aux;
+	u_int8_t r;
+	u_int i;
+
+	sc->sc_bt = ea->ea_bustag;
+
+	/* Use prom mapping, if available. */
+	if (ea->ea_nvaddrs)
+		sc->sc_bh = (bus_space_handle_t)ea->ea_vaddrs[0];
+	else if (ebus_bus_map(sc->sc_bt, 0,
+	    EBUS_PADDR_FROM_REG(&ea->ea_regs[0]), ea->ea_regs[0].size,
+	    BUS_SPACE_MAP_LINEAR, 0, &sc->sc_bh) != 0) {
+		printf(": can't map register space\n");
+		return;
+	}
+
+	sc->sc_ih = bus_intr_establish(ea->ea_bustag, ea->ea_intrs[0],
+	    IPL_TTY, 0, sab_intr, sc);
+	if (sc->sc_ih == NULL) {
+		printf(": can't map interrupt\n");
+		return;
+	}
+
+	sc->sc_softintr = softintr_establish(IPL_TTY, sab_softintr, sc);
+	if (sc->sc_softintr == NULL) {
+		printf(": can't get soft intr\n");
+		return;
+	}
+
+	printf(": rev ");
+	r = SAB_READ(sc, SAB_VSTR) & SAB_VSTR_VMASK;
+	switch (r) {
+	case SAB_VSTR_V_1:
+		printf("1");
+		break;
+	case SAB_VSTR_V_2:
+		printf("2");
+		break;
+	case SAB_VSTR_V_32:
+		printf("3.2");
+		break;
+	default:
+		printf("unknown(0x%x)", r);
+		break;
+	}
+	printf("\n");
+
+	/* Set all pins, except DTR pins to be inputs */
+	SAB_WRITE(sc, SAB_PCR, ~(SAB_PVR_DTR_A | SAB_PVR_DTR_B));
+	/* Disable port interrupts */
+	SAB_WRITE(sc, SAB_PIM, 0xff);
+	SAB_WRITE(sc, SAB_PVR, SAB_PVR_DTR_A | SAB_PVR_DTR_B | SAB_PVR_MAGIC);
+	SAB_WRITE(sc, SAB_IPC, SAB_IPC_ICPL);
+
+	for (i = 0; i < SAB_NCHAN; i++) {
+		struct sabtty_attach_args sta;
+
+		sta.sbt_portno = i;
+		sc->sc_child[i] = (struct sabtty_softc *)config_found_sm(self,
+		    &sta, sab_print, sabtty_match);
+		if (sc->sc_child[i] != NULL)
+			sc->sc_nchild++;
+	}
+}
+
+int
+sab_print(args, name)
+	void *args;
+	const char *name;
+{
+	struct sabtty_attach_args *sa = args;
+
+	if (name)
+		printf("sabtty at %s", name);
+	printf(" port %d", sa->sbt_portno);
+	return (UNCONF);
+}
+
+int
+sab_intr(vsc)
+	void *vsc;
+{
+	struct sab_softc *sc = vsc;
+	int r = 0, needsoft = 0;
+	u_int8_t gis;
+
+	gis = SAB_READ(sc, SAB_GIS);
+
+	/* channel A */
+	if ((gis & (SAB_GIS_ISA1 | SAB_GIS_ISA0)) && sc->sc_child[0] &&
+	    sc->sc_child[0]->sc_tty)
+		r |= sabtty_intr(sc->sc_child[0], &needsoft);
+
+	/* channel B */
+	if ((gis & (SAB_GIS_ISB1 | SAB_GIS_ISB0)) && sc->sc_child[1] &&
+	    sc->sc_child[1]->sc_tty)
+		r |= sabtty_intr(sc->sc_child[1], &needsoft);
+
+	if (needsoft)
+		softintr_schedule(sc->sc_softintr);
+
+	return (r);
+}
+
+void
+sab_softintr(vsc)
+	void *vsc;
+{
+	struct sab_softc *sc = vsc;
+
+	if (sc->sc_child[0] && sc->sc_child[0]->sc_tty)
+		sabtty_softintr(sc->sc_child[0]);
+	if (sc->sc_child[1] && sc->sc_child[1]->sc_tty)
+		sabtty_softintr(sc->sc_child[1]);
+}
+
+int
+sabtty_match(parent, match, aux)
+	struct device *parent;
+	void *match, *aux;
+{
+	struct sabtty_attach_args *sa = aux;
+
+	if (sa->sbt_portno < SAB_NCHAN)
+		return (1);
+	return (0);
+}
+
+void
+sabtty_attach(parent, self, aux)
+	struct device *parent;
+	struct device *self;
+	void *aux;
+{
+	struct sabtty_softc *sc = (struct sabtty_softc *)self;
+	struct sabtty_attach_args *sa = aux;
+	int r;
+
+	sc->sc_tty = ttymalloc();
+	if (sc->sc_tty == NULL) {
+		printf(": failed to allocate tty\n");
+		return;
+	}
+	tty_attach(sc->sc_tty);
+	sc->sc_tty->t_oproc = sabtty_start;
+	sc->sc_tty->t_param = sabtty_param;
+
+	sc->sc_parent = (struct sab_softc *)parent;
+	sc->sc_bt = sc->sc_parent->sc_bt;
+	sc->sc_portno = sa->sbt_portno;
+	sc->sc_rend = sc->sc_rbuf + SABTTY_RBUF_SIZE;
+
+	switch (sa->sbt_portno) {
+	case 0:	/* port A */
+		sc->sc_pvr_dtr = SAB_PVR_DTR_A;
+		sc->sc_pvr_dsr = SAB_PVR_DSR_A;
+		r = bus_space_subregion(sc->sc_bt, sc->sc_parent->sc_bh,
+		    SAB_CHAN_A, SAB_CHANLEN, &sc->sc_bh);
+		break;
+	case 1:	/* port B */
+		sc->sc_pvr_dtr = SAB_PVR_DTR_B;
+		sc->sc_pvr_dsr = SAB_PVR_DSR_B;
+		r = bus_space_subregion(sc->sc_bt, sc->sc_parent->sc_bh,
+		    SAB_CHAN_B, SAB_CHANLEN, &sc->sc_bh);
+		break;
+	default:
+		printf(": invalid channel: %u\n", sa->sbt_portno);
+		return;
+	}
+	if (r != 0) {
+		printf(": failed to allocate register subregion\n");
+		return;
+	}
+
+	sabtty_reset(sc);
+	printf("\n");
+}
+
+int
+sabtty_intr(sc, needsoftp)
+	struct sabtty_softc *sc;
+	int *needsoftp;
+{
+	u_int8_t isr0, isr1;
+	int i, len = 0, needsoft = 0, r = 0, clearfifo = 0;
+
+	isr0 = SAB_READ(sc, SAB_ISR0);
+	isr1 = SAB_READ(sc, SAB_ISR1);
+
+	if (isr0 || isr1)
+		r = 1;
+
+	if (isr0 & SAB_ISR0_RPF) {
+		len = 32;
+		clearfifo = 1;
+	}
+	if (isr0 & SAB_ISR0_TCD) {
+		len = (32 - 1) & SAB_READ(sc, SAB_RBCL);
+		clearfifo = 1;
+	}
+	if (isr0 & SAB_ISR0_TIME) {
+		sabtty_cec_wait(sc);
+		SAB_WRITE(sc, SAB_CMDR, SAB_CMDR_RFRD);
+	}
+	if (isr0 & SAB_ISR0_RFO) {
+		sc->sc_flags |= SABTTYF_RINGOVERFLOW;
+		clearfifo = 1;
+	}
+	if (len != 0) {
+		u_int8_t *ptr;
+
+		ptr = sc->sc_rput;
+		for (i = 0; i < len; i++) {
+			*ptr++ = SAB_READ(sc, SAB_RFIFO);
+			if (ptr == sc->sc_rend)
+				ptr = sc->sc_rbuf;
+			if (ptr == sc->sc_rget) {
+				if (ptr == sc->sc_rbuf)
+					ptr = sc->sc_rend;
+				ptr--;
+				sc->sc_flags |= SABTTYF_RINGOVERFLOW;
+			}
+		}
+		sc->sc_rput = ptr;
+		needsoft = 1;
+	}
+
+	if (clearfifo) {
+		sabtty_cec_wait(sc);
+		SAB_WRITE(sc, SAB_CMDR, SAB_CMDR_RMC);
+	}
+
+	if (isr0 & SAB_ISR0_CDSC) {
+		sc->sc_flags |= SABTTYF_CDCHG;
+		needsoft = 1;
+	}
+
+	if (isr1 & SAB_ISR1_XPR) {
+		r = 1;
+		if ((sc->sc_flags & SABTTYF_STOP) == 0) {
+			len = 32;
+			if (sc->sc_txc < 32)
+				len = sc->sc_txc;
+			for (i = 0; i < len; i++) {
+				SAB_WRITE(sc, SAB_XFIFO + i, *sc->sc_txp);
+				sc->sc_txp++;
+				sc->sc_txc--;
+			}
+			if (i != 0) {
+				sabtty_cec_wait(sc);
+				SAB_WRITE(sc, SAB_CMDR, SAB_CMDR_XF);
+			}
+		}
+
+		if ((sc->sc_txc == 0) || (sc->sc_flags & SABTTYF_STOP)) {
+			sc->sc_imr1 |= SAB_IMR1_XPR;
+			SAB_WRITE(sc, SAB_IMR1, sc->sc_imr1);
+			sc->sc_flags &= ~SABTTYF_STOP;
+			sc->sc_flags |= SABTTYF_DONE;
+			needsoft = 1;
+		}
+	}
+
+	if (needsoft)
+		*needsoftp = needsoft;
+	return (r);
+}
+
+void
+sabtty_softintr(sc)
+	struct sabtty_softc *sc;
+{
+	struct tty *tp = sc->sc_tty;
+	int s, flags;
+	u_int8_t r;
+
+	if (tp == NULL)
+		return;
+
+	if ((tp->t_state & TS_ISOPEN) == 0)
+		return;
+
+	while (sc->sc_rget != sc->sc_rput) {
+		int data;
+		u_int8_t stat;
+
+		data = sc->sc_rget[0];
+		stat = sc->sc_rget[1];
+		sc->sc_rget += 2;
+		if (stat & SAB_RSTAT_PE)
+			data |= TTY_PE;
+		if (stat & SAB_RSTAT_FE)
+			data |= TTY_FE;
+		if (sc->sc_rget == sc->sc_rend)
+			sc->sc_rget = sc->sc_rbuf;
+
+		(*linesw[tp->t_line].l_rint)(data, tp);
+	}
+
+	s = splhigh();
+	flags = sc->sc_flags;
+	sc->sc_flags &= ~(SABTTYF_DONE|SABTTYF_CDCHG|SABTTYF_RINGOVERFLOW);
+	splx(s);
+
+	if (flags & SABTTYF_CDCHG) {
+		s = spltty();
+		r = SAB_READ(sc, SAB_VSTR) & SAB_VSTR_CD;
+		splx(s);
+
+		(*linesw[tp->t_line].l_modem)(tp, r);
+	}
+
+	if (flags & SABTTYF_RINGOVERFLOW)
+		log(LOG_WARNING, "%s: ring overflow\n", sc->sc_dv.dv_xname);
+
+	if (flags & SABTTYF_DONE) {
+		ndflush(&tp->t_outq, sc->sc_txp - tp->t_outq.c_cf);
+		tp->t_state &= ~TS_BUSY;
+		(*linesw[tp->t_line].l_start)(tp);
+	}
+}
+
+int
+sabttyopen(dev, flags, mode, p)
+	dev_t dev;
+	int flags, mode;
+	struct proc *p;
+{
+	struct sab_softc *bc;
+	struct sabtty_softc *sc;
+	struct tty *tp;
+	int card = SAB_CARD(dev), port = SAB_PORT(dev), s;
+
+	if (card >= sab_cd.cd_ndevs)
+		return (ENXIO);
+	bc = sab_cd.cd_devs[card];
+	if (bc == NULL)
+		return (ENXIO);
+
+	if (port >= bc->sc_nchild)
+		return (ENXIO);
+	sc = bc->sc_child[port];
+	if (sc == NULL)
+		return (ENXIO);
+
+	tp = sc->sc_tty;
+	tp->t_dev = dev;
+
+	if ((tp->t_state & TS_ISOPEN) == 0) {
+		tp->t_state |= TS_WOPEN;
+
+		ttychars(tp);
+		tp->t_iflag = TTYDEF_IFLAG;
+		tp->t_oflag = TTYDEF_OFLAG;
+		tp->t_cflag = TTYDEF_CFLAG;
+		if (sc->sc_openflags & TIOCFLAG_CLOCAL)
+			tp->t_cflag |= CLOCAL;
+		if (sc->sc_openflags & TIOCFLAG_CRTSCTS)
+			tp->t_cflag |= CRTSCTS;
+		if (sc->sc_openflags & TIOCFLAG_MDMBUF)
+			tp->t_cflag |= MDMBUF;
+		tp->t_lflag = TTYDEF_LFLAG;
+		tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
+
+		sc->sc_rput = sc->sc_rget = sc->sc_rbuf;
+
+		s = spltty();
+
+		sabtty_reset(sc);
+		sabtty_param(tp, &tp->t_termios);
+		ttsetwater(tp);
+
+		sc->sc_imr0 = SAB_IMR0_PERR | SAB_IMR0_FERR | SAB_IMR0_PLLA;
+		SAB_WRITE(sc, SAB_IMR0, sc->sc_imr0);
+
+		sc->sc_imr1 = SAB_IMR1_BRKT | SAB_IMR1_ALLS | SAB_IMR1_XDU |
+		    SAB_IMR1_TIN | SAB_IMR1_CSC | SAB_IMR1_XMR | SAB_IMR1_XPR;
+		SAB_WRITE(sc, SAB_IMR1, sc->sc_imr1);
+		SAB_WRITE(sc, SAB_CCR0, SAB_READ(sc, SAB_CCR0) | SAB_CCR0_PU);
+		sabtty_flush(sc);
+
+		if ((sc->sc_openflags & TIOCFLAG_SOFTCAR) ||
+		    (SAB_READ(sc, SAB_VSTR) & SAB_VSTR_CD))
+			tp->t_state |= TS_CARR_ON;
+		else
+			tp->t_state &= ~TS_CARR_ON;
+	} else if ((tp->t_state & TS_XCLUDE) &&
+	    (!suser(p->p_ucred, &p->p_acflag))) {
+		return (EBUSY);
+	} else {
+		s = spltty();
+	}
+
+	if ((flags & O_NONBLOCK) == 0) {
+		while ((tp->t_cflag & CLOCAL) == 0 &&
+		    (tp->t_state & TS_CARR_ON) == 0) {
+			int error;
+
+			tp->t_state |= TS_WOPEN;
+			error = ttysleep(tp, &tp->t_rawq, TTIPRI | PCATCH,
+			    "sabttycd", 0);
+			if (error != 0) {
+				splx(s);
+				tp->t_state &= ~TS_WOPEN;
+				return (error);
+			}
+		}
+	}
+
+	splx(s);
+
+	return ((*linesw[tp->t_line].l_open)(dev, tp));
+}
+
+int
+sabttyclose(dev, flags, mode, p)
+	dev_t dev;
+	int flags, mode;
+	struct proc *p;
+{
+	struct sab_softc *bc = sab_cd.cd_devs[SAB_CARD(dev)];
+	struct sabtty_softc *sc = bc->sc_child[SAB_PORT(dev)];
+	struct tty *tp = sc->sc_tty;
+	int s;
+
+	(*linesw[tp->t_line].l_close)(tp, flags);
+	s = spltty();
+
+	if ((tp->t_cflag & HUPCL) || ((tp->t_state & TS_ISOPEN) == 0)) {
+		sabtty_mdmctrl(sc, 0, DMSET);
+		sabtty_flush(sc);
+		sabtty_reset(sc);
+	}
+	splx(s);
+	ttyclose(tp);
+	return (0);
+}
+
+int
+sabttyread(dev, uio, flags)
+	dev_t dev;
+	struct uio *uio;
+	int flags;
+{
+	struct sab_softc *bc = sab_cd.cd_devs[SAB_CARD(dev)];
+	struct sabtty_softc *sc = bc->sc_child[SAB_PORT(dev)];
+	struct tty *tp = sc->sc_tty;
+
+	return ((*linesw[tp->t_line].l_read)(tp, uio, flags));
+}
+
+int
+sabttywrite(dev, uio, flags)
+	dev_t dev;
+	struct uio *uio;
+	int flags;
+{
+	struct sab_softc *bc = sab_cd.cd_devs[SAB_CARD(dev)];
+	struct sabtty_softc *sc = bc->sc_child[SAB_PORT(dev)];
+	struct tty *tp = sc->sc_tty;
+
+	return ((*linesw[tp->t_line].l_write)(tp, uio, flags));
+}
+
+int
+sabttyioctl(dev, cmd, data, flags, p)
+	dev_t dev;
+	u_long cmd;
+	caddr_t data;
+	int flags;
+	struct proc *p;
+{
+	struct sab_softc *bc = sab_cd.cd_devs[SAB_CARD(dev)];
+	struct sabtty_softc *sc = bc->sc_child[SAB_PORT(dev)];
+	struct tty *tp = sc->sc_tty;
+	int error;
+
+	error = (*linesw[tp->t_line].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:
+		SAB_WRITE(sc, SAB_DAFO,
+		    SAB_READ(sc, SAB_DAFO) | SAB_DAFO_XBRK);
+		break;
+	case TIOCCBRK:
+		SAB_WRITE(sc, SAB_DAFO,
+		    SAB_READ(sc, SAB_DAFO) & ~SAB_DAFO_XBRK);
+		break;
+	case TIOCSDTR:
+		sabtty_mdmctrl(sc, TIOCM_DTR, DMBIS);
+		break;
+	case TIOCCDTR:
+		sabtty_mdmctrl(sc, TIOCM_DTR, DMBIC);
+		break;
+	case TIOCMBIS:
+		sabtty_mdmctrl(sc, *((int *)data), DMBIS);
+		break;
+	case TIOCMBIC:
+		sabtty_mdmctrl(sc, *((int *)data), DMBIC);
+		break;
+	case TIOCMGET:
+		*((int *)data) = sabtty_mdmctrl(sc, 0, DMGET);
+		break;
+	case TIOCMSET:
+		sabtty_mdmctrl(sc, *((int *)data), DMSET);
+		break;
+	case TIOCGFLAGS:
+		*((int *)data) = sc->sc_openflags;
+		break;
+	case TIOCSFLAGS:
+		if (suser(p->p_ucred, &p->p_acflag))
+			error = EPERM;
+		else
+			sc->sc_openflags = *((int *)data) &
+			    (TIOCFLAG_SOFTCAR | TIOCFLAG_CLOCAL |
+			     TIOCFLAG_CRTSCTS | TIOCFLAG_MDMBUF);
+		break;
+	default:
+		error = ENOTTY;
+	}
+
+	return (error);
+}
+
+struct tty *
+sabttytty(dev)
+	dev_t dev;
+{
+	struct sab_softc *bc = sab_cd.cd_devs[SAB_CARD(dev)];
+	struct sabtty_softc *sc = bc->sc_child[SAB_PORT(dev)];
+
+	return (sc->sc_tty);
+}
+
+int
+sabttystop(tp, flags)
+	struct tty *tp;
+	int flags;
+{
+	struct sab_softc *bc = sab_cd.cd_devs[SAB_CARD(tp->t_dev)];
+	struct sabtty_softc *sc = bc->sc_child[SAB_PORT(tp->t_dev)];
+	int s;
+
+	s = spltty();
+	if (tp->t_state & TS_BUSY) {
+		if ((tp->t_state & TS_TTSTOP) == 0)
+			tp->t_state |= TS_FLUSH;
+		sc->sc_flags |= SABTTYF_STOP;
+	}
+	splx(s);
+	return (0);
+}
+
+int
+sabtty_mdmctrl(sc, bits, how)
+	struct sabtty_softc *sc;
+	int bits, how;
+{
+	u_int8_t r;
+	int s;
+
+	s = spltty();
+	switch (how) {
+	case DMGET:
+		bits = 0;
+		if (SAB_READ(sc, SAB_STAR) & SAB_STAR_CTS)
+			bits |= TIOCM_CTS;
+		if ((SAB_READ(sc, SAB_VSTR) & SAB_VSTR_CD) == 0)
+			bits |= TIOCM_CD;
+
+		r = SAB_READ(sc, SAB_PVR);
+		if ((r & sc->sc_pvr_dtr) == 0)
+			bits |= TIOCM_DTR;
+		if ((r & sc->sc_pvr_dsr) == 0)
+			bits |= TIOCM_DSR;
+
+		r = SAB_READ(sc, SAB_MODE);
+		if ((r & (SAB_MODE_RTS|SAB_MODE_FRTS)) == SAB_MODE_RTS)
+			bits |= TIOCM_RTS;
+		break;
+	case DMSET:
+		r = SAB_READ(sc, SAB_MODE);
+		if (bits & TIOCM_RTS) {
+			r &= ~SAB_MODE_FRTS;
+			r |= SAB_MODE_RTS;
+		} else
+			r |= SAB_MODE_FRTS | SAB_MODE_RTS;
+		SAB_WRITE(sc, SAB_MODE, r);
+
+		r = SAB_READ(sc, SAB_PVR);
+		if (bits & TIOCM_DTR)
+			r &= ~sc->sc_pvr_dtr;
+		else
+			r |= sc->sc_pvr_dtr;
+		SAB_WRITE(sc, SAB_PVR, r);
+		break;
+	case DMBIS:
+		if (bits & TIOCM_RTS) {
+			r = SAB_READ(sc, SAB_MODE);
+			r &= ~SAB_MODE_FRTS;
+			r |= SAB_MODE_RTS;
+			SAB_WRITE(sc, SAB_MODE, r);
+		}
+		if (bits & TIOCM_DTR) {
+			r = SAB_READ(sc, SAB_PVR);
+			r &= ~sc->sc_pvr_dtr;
+			SAB_WRITE(sc, SAB_PVR, r);
+		}
+		break;
+	case DMBIC:
+		if (bits & TIOCM_RTS) {
+			r = SAB_READ(sc, SAB_MODE);
+			r |= SAB_MODE_FRTS | SAB_MODE_RTS;
+			SAB_WRITE(sc, SAB_MODE, r);
+		}
+		if (bits & TIOCM_DTR) {
+			r = SAB_READ(sc, SAB_PVR);
+			r |= sc->sc_pvr_dtr;
+			SAB_WRITE(sc, SAB_PVR, r);
+		}
+		break;
+	}
+	splx(s);
+	return (bits);
+}
+
+int
+sabtty_param(tp, t)
+	struct tty *tp;
+	struct termios *t;
+{
+	struct sab_softc *bc = sab_cd.cd_devs[SAB_CARD(tp->t_dev)];
+	struct sabtty_softc *sc = bc->sc_child[SAB_PORT(tp->t_dev)];
+	int s, ospeed;
+	u_int8_t dafo, r;
+
+	ospeed = sabtty_speed(t->c_ospeed);
+	if (ospeed < 0 || (t->c_ispeed && t->c_ispeed != t->c_ospeed))
+		return (EINVAL);
+
+	s = spltty();
+
+	/* hang up line if ospeed is zero, otherwise raise dtr */
+	sabtty_mdmctrl(sc, TIOCM_DTR,
+	    (t->c_ospeed == 0) ? DMBIC : DMBIS);
+
+	dafo = SAB_READ(sc, SAB_DAFO);
+
+	if (t->c_cflag & CSTOPB)
+		dafo |= SAB_DAFO_STOP;
+	else
+		dafo &= ~SAB_DAFO_STOP;
+
+	dafo &= ~SAB_DAFO_CHL_CSIZE;
+	switch (t->c_cflag & CSIZE) {
+	case CS5:
+		dafo |= SAB_DAFO_CHL_CS5;
+		break;
+	case CS6:
+		dafo |= SAB_DAFO_CHL_CS6;
+		break;
+	case CS7:
+		dafo |= SAB_DAFO_CHL_CS7;
+		break;
+	default:
+		dafo |= SAB_DAFO_CHL_CS8;
+		break;
+	}
+
+	dafo &= ~SAB_DAFO_PARMASK;
+	if (t->c_cflag & PARENB) {
+		if (tp->t_cflag & PARODD)
+			dafo |= SAB_DAFO_PAR_ODD;
+		else
+			dafo |= SAB_DAFO_PAR_EVEN;
+	} else
+		dafo |= SAB_DAFO_PAR_NONE;
+
+	if (ospeed != 0) {
+		SAB_WRITE(sc, SAB_BGR, ospeed & 0xff);
+		r = SAB_READ(sc, SAB_CCR2);
+		r &= ~(SAB_CCR2_BR9 | SAB_CCR2_BR8);
+		r |= (ospeed >> 2) & (SAB_CCR2_BR9 | SAB_CCR2_BR8);
+		SAB_WRITE(sc, SAB_CCR2, r);
+	}
+
+	r = SAB_READ(sc, SAB_MODE);
+	r |= SAB_MODE_RAC;
+	if (t->c_cflag & CRTSCTS) {
+		r &= ~(SAB_MODE_RTS | SAB_MODE_FCTS);
+		r |= SAB_MODE_FRTS;
+		sc->sc_imr1 &= ~SAB_IMR1_CSC;
+	} else {
+		r |= SAB_MODE_RTS | SAB_MODE_FCTS;
+		r &= ~SAB_MODE_FRTS;
+		sc->sc_imr1 |= SAB_IMR1_CSC;
+	}
+	SAB_WRITE(sc, SAB_MODE, r);
+	SAB_WRITE(sc, SAB_IMR1, sc->sc_imr1);
+
+	splx(s);
+	return (0);
+}
+
+void
+sabtty_start(tp)
+	struct tty *tp;
+{
+	struct sab_softc *bc = sab_cd.cd_devs[SAB_CARD(tp->t_dev)];
+	struct sabtty_softc *sc = bc->sc_child[SAB_PORT(tp->t_dev)];
+	int s;
+
+	s = spltty();
+	if ((tp->t_state & (TS_TTSTOP | TS_TIMEOUT | TS_BUSY)) == 0) {
+		if (tp->t_outq.c_cc <= tp->t_lowat) {
+			if (tp->t_state & TS_ASLEEP) {
+				tp->t_state &= ~TS_ASLEEP;
+				wakeup(&tp->t_outq);
+			}
+			selwakeup(&tp->t_wsel);
+		}
+		if (tp->t_outq.c_cc) {
+			sc->sc_txc = ndqb(&tp->t_outq, 0);
+			sc->sc_txp = tp->t_outq.c_cf;
+			tp->t_state |= TS_BUSY;
+			sc->sc_imr1 &= ~SAB_IMR1_XPR;
+			SAB_WRITE(sc, SAB_IMR1, sc->sc_imr1);
+		}
+	}
+	splx(s);
+}
+
+void
+sabtty_cec_wait(sc)
+	struct sabtty_softc *sc;
+{
+	int i = 50000;
+
+	for (;;) {
+		if ((SAB_READ(sc, SAB_STAR) & SAB_STAR_CEC) == 0)
+			return;
+		if (--i == 0)
+			break;
+		DELAY(1);
+	}
+	if (i == 0)
+		printf("%s: cec timeout\n", sc->sc_dv.dv_xname);
+}
+
+void
+sabtty_tec_wait(sc)
+	struct sabtty_softc *sc;
+{
+	int i = 200000;
+
+	for (;;) {
+		if ((SAB_READ(sc, SAB_STAR) & SAB_STAR_TEC) == 0)
+			return;
+		if (--i == 0)
+			break;
+		DELAY(1);
+	}
+	if (i == 0)
+		printf("%s: tec timeout\n", sc->sc_dv.dv_xname);
+}
+
+void
+sabtty_reset(sc)
+	struct sabtty_softc *sc;
+{
+	/* power down */
+	SAB_WRITE(sc, SAB_CCR0, 0);
+
+	/* set basic configuration */
+	SAB_WRITE(sc, SAB_CCR0,
+	    SAB_CCR0_MCE | SAB_CCR0_SC_NRZ | SAB_CCR0_SM_ASYNC);
+	SAB_WRITE(sc, SAB_CCR1, SAB_CCR1_ODS | SAB_CCR1_BCR | SAB_CCR1_CM_7);
+	SAB_WRITE(sc, SAB_CCR2, SAB_CCR2_BDF | SAB_CCR2_SSEL | SAB_CCR2_TOE);
+	SAB_WRITE(sc, SAB_CCR3, 0);
+	SAB_WRITE(sc, SAB_CCR4, SAB_CCR4_MCK4 | SAB_CCR4_EBRG);
+	SAB_WRITE(sc, SAB_MODE, SAB_MODE_RTS | SAB_MODE_FCTS | SAB_MODE_RAC);
+	SAB_WRITE(sc, SAB_RFC,
+	    SAB_RFC_DPS | SAB_RFC_RFDF | SAB_RFC_RFTH_32CHAR);
+
+	/* clear interrupts */
+	sc->sc_imr0 = sc->sc_imr1 = 0xff;
+	SAB_WRITE(sc, SAB_IMR0, sc->sc_imr0);
+	SAB_WRITE(sc, SAB_IMR1, sc->sc_imr1);
+	SAB_READ(sc, SAB_ISR0);
+	SAB_READ(sc, SAB_ISR1);
+}
+
+void
+sabtty_flush(sc)
+	struct sabtty_softc *sc;
+{
+	/* clear rx fifo */
+	sabtty_cec_wait(sc);
+	SAB_WRITE(sc, SAB_CMDR, SAB_CMDR_RRES);
+
+	/* clear tx fifo */
+	sabtty_cec_wait(sc);
+	SAB_WRITE(sc, SAB_CMDR, SAB_CMDR_XRES);
+}
+
+int
+sabtty_speed(rate)
+	int rate;
+{
+	int i, len, r;
+
+	if (rate == 0)
+		return (0);
+	len = sizeof(sabtty_baudtable)/sizeof(sabtty_baudtable[0]);
+	for (i = 0; i < len; i++) {
+		if (rate == sabtty_baudtable[i].baud) {
+			r = sabtty_baudtable[i].n |
+			    (sabtty_baudtable[i].m << 6);
+			return (r);
+		}
+	}
+	return (-1);
+}