sio.c

早期freebsd实现

	default:
		return (ENOTTY);
	}
	return (0);
}


/*
 *
 */

void
siostart(tp)
	register struct tty *tp;
{
	register struct siodevice *sio;
	register int rr;
	int s, unit, c;
 
	unit = siounit(tp->t_dev);
	sio = sio_softc[unit].sc_pc->pc_addr;
	s = spltty();
	if (tp->t_state & (TS_TIMEOUT|TS_TTSTOP))
		goto out;
	if (tp->t_outq.c_cc <= tp->t_lowat) {
		if (tp->t_state&TS_ASLEEP) {
			tp->t_state &= ~TS_ASLEEP;
			wakeup((caddr_t)&tp->t_outq);
		}
		selwakeup(&tp->t_wsel);
	}
	if (tp->t_outq.c_cc == 0)
		goto out;
	rr = siogetreg(sio);
	if (rr & RR_TXRDY) {
		c = getc(&tp->t_outq);
		tp->t_state |= TS_BUSY;
		sio->sio_data = c;
	}
out:
	splx(s);
}

sioparam(tp, t)
	register struct tty *tp;
	register struct termios *t;
{
	int unit = siounit(tp->t_dev);
	register struct siodevice *sio;
	register cflag = t->c_cflag;
	register u_char wr;
	int ospeed = ttspeedtab(t->c_ospeed, siospeedtab);

	sio = sio_softc[unit].sc_pc->pc_addr;

	switch (cflag & CSIZE) {
	case CS5:
	case CS6:
	case CS7:
	case CS8:
		break;
	}

	wr = ospeed;

	if (cflag & PARENB) {
		wr |= WR4_PARENAB;
		if ((cflag&PARODD) == 0)
			wr |= WR4_EPARITY;
	}

	if (cflag & CSTOPB)
		wr |= WR4_STOP2;			/* 2 stop bit */
	else
		wr |= WR4_STOP1;			/* 1 stop bit */

	(void) sioreg(sio, WR4, wr);

	return (0);
}

siomctl()
{
	return (0);
}


/*
 *  Interrupt handling
 */

void
_siointr()
{
	register int port;
	register struct sio_portc *pc;

	for (port = 0; port < NPORT; port++) {
		pc = &sio_portc[port];

		if (pc->pc_major != -1)
			(pc->pc_intr)(pc->pc_unit);
	}
}

siointr(unit)
	register int unit;
{
	register struct siodevice *sio = sio_softc[unit].sc_pc->pc_addr;
	register u_char code;
	register struct tty *tp;
	int s, rr;

	tp = &sio_tty[unit];

start:
	rr = siogetreg(sio);
	if (rr & RR_RXRDY) {
		if (rr & (RR_FRAMING | RR_OVERRUN | RR_PARITY)) {
			sioeint(unit, rr, sio);
			goto start;
		}

		code = sio->sio_data;
		if ((tp->t_state & TS_ISOPEN) != 0)
			(*linesw[tp->t_line].l_rint)(code, tp);
#ifdef KGDB
		else {
			if (code == FRAME_END &&
			    kgdb_dev == makedev(siomajor, unit))
				kgdb_connect(0); /* trap into kgdb */
		}
#endif
		while ((rr = siogetreg(sio)) & RR_RXRDY) {
			code = sio->sio_data;
			if ((tp->t_state & TS_ISOPEN) != 0)
				(*linesw[tp->t_line].l_rint)(code, tp);
#ifdef KGDB
			else {
				if (code == FRAME_END &&
				    kgdb_dev == makedev(siomajor, unit))
					kgdb_connect(0); /* trap into kgdb */
			}
#endif
		}
	}

	if (rr & RR_TXRDY) {
		sio->sio_cmd = WR0_RSTPEND;
		tp->t_state &= ~(TS_BUSY|TS_FLUSH);
		if (tp->t_line)
			(*linesw[tp->t_line].l_start)(tp);
		else
			siostart(tp);
	}
}

sioeint(unit, stat, sio)
	register int unit, stat;
	register struct siodevice *sio;
{
	register struct tty *tp;
	register int code;

	tp = &sio_tty[unit];

	code = sio->sio_data;

	sio->sio_cmd = WR0_ERRRST;

	if ((tp->t_state & TS_ISOPEN) == 0) {
#ifdef KGDB
		/* we don't care about parity errors */
		if (((stat & (RR_FRAMING|RR_PARITY)) == RR_PARITY) &&
		    kgdb_dev == makedev(siomajor, unit) && code == FRAME_END)
			kgdb_connect(0); /* trap into kgdb */
#endif
		return;
	}

	if (stat & RR_FRAMING)
		code |= TTY_FE;
	else if (stat & RR_PARITY)
		code |= TTY_PE;

	(*linesw[tp->t_line].l_rint)(code, tp);
}

/*
 * Following are all routines needed for SIO to act as console
 */
#include <luna68k/luna68k/cons.h>

siocnprobe(cp)
	register struct consdev *cp;
{
	register int unit = 0;

	/* locate the major number */
	for (siomajor = 0; siomajor < nchrdev; siomajor++)
		if (cdevsw[siomajor].d_open == sioopen)
			break;

	/* initialize required fields */
	cp->cn_dev = makedev(siomajor, unit);
	cp->cn_tp  = &sio_tty[unit];
	cp->cn_pri = CN_NORMAL;
}

siocninit(cp)
	struct consdev *cp;
{
	int unit = siounit(cp->cn_dev);
	register struct sio_softc *sc = &sio_softc[unit];

	sioinit((struct siodevice *) SIO_HARDADDR, siodefaultrate);

	/* port assign */
	sc->sc_pc = sio_port_assign(SIO_PORT, siomajor, unit, siointr);

	sioconsole = unit;
	sio_active |= 1 << unit;
	siosoftCAR |= 1 << unit;
}

siocngetc(dev)
	dev_t dev;
{
	struct sio_softc *sc = &sio_softc[siounit(dev)];
	struct sio_portc *pc = sc->sc_pc;

	return(sio_imgetc(pc->pc_addr));
}

siocnputc(dev, c)
	dev_t dev;
	int c;
{
	struct sio_softc *sc = &sio_softc[siounit(dev)];
	struct sio_portc *pc = sc->sc_pc;

	sio_imputc(pc->pc_addr, c);
}


/*
 *  sio raw-level routines
 */

sioinit(sio0, rate)
	register struct siodevice *sio0;
	register int rate;
{
	register struct siodevice *sio1;
	int s;

	rate = ttspeedtab(rate, siospeedtab);

	if (sio_init_done)
		return;

	sio1 = (struct siodevice *) ((u_long) sio0 + sizeof(struct siodevice));

	s = splhigh();

	sioreg(sio0, WR0,  WR0_CHANRST);		/* Channel-A Reset */

	sioreg(sio0, WR2, (WR2_VEC86  | WR2_INTR_1));	/* Set CPU BUS Interface Mode */
	sioreg(sio1, WR2,  0);				/* Set Interrupt Vector */

	sioreg(sio0, WR0,  WR0_RSTINT);		/* Reset E/S Interrupt */
	sioreg(sio0, WR4, (rate | WR4_STOP1 | WR4_NPARITY));	/* Tx/Rx */
	sioreg(sio0, WR3, (WR3_RX8BIT | WR3_RXENBL));		/* Rx */
	sioreg(sio0, WR5, (WR5_TX8BIT | WR5_TXENBL));		/* Tx */
	sioreg(sio0, WR0,  WR0_RSTINT);		/* Reset E/S Interrupt */
	sioreg(sio0, WR1, (WR1_RXALLS | WR1_TXENBL));

	sioreg(sio1, WR0,  WR0_CHANRST);		/* Channel-B Reset */

	sioreg(sio1, WR0,  WR0_RSTINT);		/* Reset E/S Interrupt */
	sioreg(sio1, WR4, (rate | WR4_STOP1 | WR4_NPARITY));	/* Tx/Rx */
	sioreg(sio1, WR3, (WR3_RX8BIT | WR3_RXENBL));		/* Rx */
	sioreg(sio1, WR5, (WR5_TX8BIT | WR5_TXENBL));		/* Tx */
	sioreg(sio1, WR0,  WR0_RSTINT);		/* Reset E/S Interrupt */
	sioreg(sio1, WR1, (WR1_RXALLS | WR1_TXENBL));

	splx(s);

	sio_init_done = 1;
}

sio_imgetc(sio)
	register struct siodevice *sio;
{
	register int rr0, rr1;
	int c, s;

	s = splhigh();
	while (((rr0 = sioreg(sio, RR0, 0)) & RR0_RXAVAIL) == 0)
		;
	c = sio->sio_data;
	sioreg(sio, WR0, WR0_RSTPEND);
	splx(s);
	return (c);
}

sio_imputc(sio, c)
	register struct siodevice *sio;
	int c;
{
	register u_char code;
	register int rr;
	int s;

	s = splhigh();

	sioreg(sio, WR1, WR1_RXALLS);

	do {
		DELAY(1);
		rr = siogetreg(sio);
	} while (!(rr & RR_TXRDY));

	code = (c & 0xFF);
	sio->sio_data = code;

	do {
		DELAY(1);
		rr = siogetreg(sio);
	} while (!(rr & RR_TXRDY));

	sioreg(sio, WR1, (WR1_RXALLS | WR1_TXENBL));

	splx(s);
}

/*
 *  uPD7201A register operation
 */

int
siogetreg(sio)
	register struct siodevice *sio;
{
	register int rr = 0;

	rr = sio->sio_stat;
	rr <<= 8;
	sio->sio_cmd = 1;	/* Select RR1 */
	rr |= sio->sio_stat;

	return(rr);
}

int
sioreg(sio, reg, val)
	register struct siodevice *sio;
	register int reg, val;
{
	if (isStatusReg(reg)) {
		if (reg != 0)
		    sio->sio_cmd = reg;
		val = sio->sio_stat;
	} else {
		if (reg != 0)
		    sio->sio_cmd = reg;
		sio->sio_cmd = val;
	}

	return(val);
}
#endif