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NetBSD/sys/arch/da30/dev/zs.c

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/* $NetBSD: zs.c,v 1.4 1994/10/26 02:33:32 cgd Exp $ */
/*
* Copyright (c) 1993 Paul Mackerras.
* 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. The name of the author may not be used to endorse or promote products
* derived from this software withough 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.
*/
/*
* Serial I/O via an SCC,
* also support for SCSI interface interrupts.
*/
#include <sys/param.h>
#include <sys/conf.h>
#include <sys/ioctl.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <sys/tty.h>
#include <sys/uio.h>
#include <sys/callout.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/syslog.h>
#include <sys/fcntl.h>
#include <sys/device.h>
#include <machine/cpu.h>
#include <dev/cons.h>
#include <da30/da30/isr.h>
#include <da30/da30/iio.h>
#include <da30/dev/scc.h>
#include "zs.h"
#if NZS > 0
#define PCLK_FREQ 8333333
#define NZSLINE (NZS*2)
/*
* The SCSI bus interface controller (SBIC) is connected to the
* modem lines of this unit.
*/
#define SCSI_UNIT 3
#define RECV_BUF 512
#define ERROR_DET 0xed
#define TS_DRAIN TS_FLUSH /* waiting for output to drain */
#define splzs() spl6()
struct zs {
short flags; /* see below */
char rr0; /* holds previous CTS, DCD state */
unsigned char imask; /* mask for input chars */
int nzs_open; /* # opens as /dev/zsn */
int nkbd_open; /* # opens as a keyboard */
int gsp_unit; /* unit to send kbd chars to */
struct tty *tty; /* link to tty structure */
struct sccregs scc; /* SCC shadow registers */
u_char *rcv_get;
u_char *rcv_put;
u_char *rcv_end;
volatile int rcv_count;
int rcv_len;
char *send_ptr;
int send_count;
int sent_count;
volatile char modem_state;
volatile char modem_change;
volatile short hflags;
char rcv_buf[RECV_BUF];
};
/* Bits in flags */
#define ZS_SIDEA 1
#define ZS_INITED 2
#define ZS_INTEN 4
#define ZS_RESET 8
#define ZS_SCSI 0x10
#define ZS_CONSOLE 0x20
/* Bits in hflags */
#define ZH_OBLOCK 1 /* output blocked by CTS */
#define ZH_SIRQ 2 /* soft interrupt request */
#define ZH_TXING 4 /* transmitter active */
#define ZH_RXOVF 8 /* receiver buffer overflow */
struct zssoftc {
struct device dev;
struct isr isr;
struct zs zs[2];
};
struct tty *zs_tty[NZSLINE];
struct termios zs_cons_termios;
int zs_cons_unit = 0;
int zs_is_console = 0;
struct sccregs *zs_cons_scc;
int zsopen __P((dev_t, int, int, struct proc *));
void zsstart __P((struct tty *));
int zsparam __P((struct tty *, struct termios *));
int zsirq __P((int unit));
void zs_softint __P((void));
extern unsigned long sir_scsi;
struct zs *zs_scsi;
#define setsoftscsi() setsoftint(sir_scsi)
unsigned long sir_zs;
void zs_softint();
#define zsunit(dev) (minor(dev) >> 1)
#define zsside(dev) (minor(dev) & 1)
/*
* Autoconfiguration stuff.
*/
void zsattach __P((struct device *, struct device *, void *));
int zsmatch __P((struct device *, struct cfdata *, void *));
struct cfdriver zscd = {
NULL, "zs", zsmatch, zsattach, DV_TTY, sizeof(struct zssoftc), 0
};
int
zsmatch(parent, cf, args)
struct device *parent;
struct cfdata *cf;
void *args;
{
return !badbaddr((caddr_t) IIO_CFLOC_ADDR(cf));
}
void
zsattach(parent, self, args)
struct device *parent, *self;
void *args;
{
struct zssoftc *dv;
struct zs *zp, *zc;
volatile struct scc *scc;
iio_print(self->dv_cfdata);
/* connect the interrupt */
dv = (struct zssoftc *) self;
dv->isr.isr_intr = zsirq;
dv->isr.isr_arg = self->dv_unit;
dv->isr.isr_ipl = IIO_CFLOC_LEVEL(self->dv_cfdata);
isrlink(&dv->isr);
zp = &dv->zs[0];
scc = (volatile struct scc *) IIO_CFLOC_ADDR(self->dv_cfdata);
if( zs_is_console && self->dv_unit == zsunit(zs_cons_unit) ){
/* SCC is the console - it's already reset */
zc = zp + zsside(zs_cons_unit);
zc->scc = *zs_cons_scc;
zs_cons_scc = &zc->scc;
zc->flags |= ZS_CONSOLE;
} else {
/* reset the SCC */
scc->cr = 0;
scc->cr = 9;
scc->cr = 0xC0; /* hardware reset of SCC, both sides */
}
/* side A */
zp->scc.s_adr = scc + 1;
zp->flags |= ZS_SIDEA | ZS_RESET;
/* side B */
++zp;
zp->scc.s_adr = scc;
zp->flags |= ZS_RESET;
if( sir_zs == 0 )
sir_zs = allocate_sir(zs_softint, 0);
if( self->dv_unit == zsunit(SCSI_UNIT) ){
zs_scsi = &dv->zs[zsside(SCSI_UNIT)];
zs_scsi->flags |= ZS_SCSI;
}
}
zs_ttydef(struct zs *zp)
{
struct tty *tp = zp->tty;
if( (zp->flags & ZS_CONSOLE) == 0 ){
tp->t_iflag = TTYDEF_IFLAG;
tp->t_oflag = TTYDEF_OFLAG;
tp->t_cflag = TTYDEF_CFLAG;
tp->t_lflag = TTYDEF_LFLAG;
tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
} else
tp->t_termios = zs_cons_termios;
ttychars(tp);
ttsetwater(tp);
tp->t_oproc = zsstart;
tp->t_param = zsparam;
zp->rcv_get = zp->rcv_buf;
zp->rcv_put = zp->rcv_buf;
zp->rcv_end = zp->rcv_buf + sizeof(zp->rcv_buf);
zp->rcv_len = sizeof(zp->rcv_buf) / 2;
}
/* ARGSUSED */
zsopen(dev_t dev, int flag, int mode, struct proc *p)
{
register struct tty *tp;
int error;
struct zs *zp;
struct zssoftc *dv;
if( zsunit(dev) > zscd.cd_ndevs
|| (dv = (struct zssoftc *) zscd.cd_devs[zsunit(dev)]) == NULL )
return ENODEV;
zp = &dv->zs[zsside(dev)];
if( zp->tty == NULL ){
zp->tty = ttymalloc();
zs_ttydef(zp);
if( minor(dev) < NZSLINE )
zs_tty[minor(dev)] = zp->tty;
}
tp = zp->tty;
tp->t_dev = dev;
if ((tp->t_state & TS_ISOPEN) == 0) {
tp->t_state |= TS_WOPEN;
zs_init(zp);
if( (zp->modem_state & SCC_DCD) != 0 )
tp->t_state |= TS_CARR_ON;
} else if (tp->t_state&TS_XCLUDE && p->p_ucred->cr_uid != 0)
return (EBUSY);
error = ((*linesw[tp->t_line].l_open)(dev, tp));
if( error == 0 )
++zp->nzs_open;
return error;
}
int
zsclose(dev, flag, mode, p)
dev_t dev;
int flag, mode;
struct proc *p;
{
struct zs *zp;
struct tty *tp;
struct zssoftc *dv;
int s;
if( zsunit(dev) > zscd.cd_ndevs
|| (dv = (struct zssoftc *) zscd.cd_devs[zsunit(dev)]) == NULL )
return ENODEV;
zp = &dv->zs[zsside(dev)];
tp = zp->tty;
if( zp->nkbd_open == 0){
(*linesw[tp->t_line].l_close)(tp, flag);
s = splzs();
if( (tp->t_cflag & HUPCL) != 0 && (zp->flags & ZS_SCSI) == 0 ){
ZBIC(&zp->scc, 5, 0x82); /* drop DTR, RTS */
}
ZBIC(&zp->scc, 3, 1); /* disable receiver */
splx(s);
ttyclose(tp);
}
zp->nzs_open = 0;
return(0);
}
/*ARGSUSED*/
zsread(dev, uio, flag)
dev_t dev;
struct uio *uio;
int flag;
{
struct zssoftc *dv = (struct zssoftc *) zscd.cd_devs[zsunit(dev)];
struct zs *zp = &dv->zs[zsside(dev)];
struct tty *tp = zp->tty;
return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
}
/*ARGSUSED*/
zswrite(dev, uio, flag)
dev_t dev;
struct uio *uio;
int flag;
{
struct zssoftc *dv = (struct zssoftc *) zscd.cd_devs[zsunit(dev)];
struct zs *zp = &dv->zs[zsside(dev)];
struct tty *tp = zp->tty;
return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
}
zsioctl(dev, cmd, data, flag, p)
dev_t dev;
caddr_t data;
int cmd, flag;
struct proc *p;
{
struct zssoftc *dv = (struct zssoftc *) zscd.cd_devs[zsunit(dev)];
struct zs *zp = &dv->zs[zsside(dev)];
struct tty *tp = zp->tty;
register struct sccregs *scc = &zp->scc;
register int error, s;
error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p);
if (error >= 0)
return (error);
error = ttioctl(tp, cmd, data, flag, p);
if (error >= 0)
return (error);
if( (zp->flags & ZS_SCSI) != 0 )
return ENOTTY;
error = 0;
s = splzs();
switch( cmd ){
case TIOCSDTR:
ZBIS(scc, 5, 0x80);
break;
case TIOCCDTR:
ZBIC(scc, 5, 0x80);
break;
case TIOCSBRK:
splx(s);
zs_drain(zp);
s = splzs();
ZBIS(scc, 5, 0x10);
spltty();
zs_unblock(tp);
break;
case TIOCCBRK:
ZBIC(scc, 5, 0x10);
break;
case TIOCMGET:
*(int *)data = zscc_mget(scc);
break;
case TIOCMSET:
zscc_mset(scc, *(int *)data);
zscc_mclr(scc, ~*(int *)data);
break;
case TIOCMBIS:
zscc_mset(scc, *(int *)data);
break;
case TIOCMBIC:
zscc_mclr(scc, *(int *)data);
break;
default:
error = ENOTTY;
}
splx(s);
return error;
}
zsparam(tp, t)
struct tty *tp;
struct termios *t;
{
struct zssoftc *dv = (struct zssoftc *) zscd.cd_devs[zsunit(tp->t_dev)];
struct zs *zp = &dv->zs[zsside(tp->t_dev)];
register int s;
zs_drain(zp);
s = splzs();
zp->imask = zscc_params(&zp->scc, t, !(zp->flags & ZS_SCSI));
tp->t_ispeed = t->c_ispeed;
tp->t_ospeed = t->c_ospeed;
tp->t_cflag = t->c_cflag;
if( (tp->t_cflag & CCTS_OFLOW) == 0 )
zp->hflags &= ~ZH_OBLOCK;
else if( (zp->modem_state & 0x20) == 0 && (zp->flags & ZS_SCSI) == 0 )
zp->hflags |= ZH_OBLOCK;
spltty();
zs_unblock(tp);
splx(s);
return 0;
}
void
zsstart(tp)
struct tty *tp;
{
struct zssoftc *dv = (struct zssoftc *) zscd.cd_devs[zsunit(tp->t_dev)];
struct zs *zp = &dv->zs[zsside(tp->t_dev)];
register int s, n;
s = spltty();
if( (tp->t_state & (TS_TIMEOUT|TS_BUSY|TS_TTSTOP|TS_DRAIN)) == 0 ){
n = ndqb(&tp->t_outq, 0);
if( n > 0 ){
tp->t_state |= TS_BUSY;
splzs();
zp->hflags |= ZH_TXING;
zp->send_ptr = tp->t_outq.c_cf;
zp->send_count = n;
zp->sent_count = 0;
zs_txint(zp);
spltty();
}
}
splx(s);
}
zsstop(struct tty *tp, int flag)
{
struct zssoftc *dv = (struct zssoftc *) zscd.cd_devs[zsunit(tp->t_dev)];
struct zs *zp = &dv->zs[zsside(tp->t_dev)];
int s, n;
s = splzs();
zp->send_count = 0;
n = zp->sent_count;
zp->sent_count = 0;
if( (tp->t_state & TS_BUSY) != 0 && (flag & FWRITE) == 0 ){
tp->t_state &= ~TS_BUSY;
spltty();
ndflush(&tp->t_outq, n);
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);
}
}
splx(s);
}
zs_init(zp)
struct zs *zp;
{
register int s;
s = splzs();
zscc_init(zp, &zp->tty->t_termios);
zp->rr0 = zp->modem_state = ZREAD0(&zp->scc);
ZBIS(&zp->scc, 1, 0x13); /* ints on tx, rx and ext/status */
ZBIS(&zp->scc, 9, 8); /* enable ints */
zp->flags |= ZS_INTEN;
splx(s);
}
zscc_init(zp, par)
struct zs *zp;
struct termios *par;
{
struct sccregs *scc;
scc = &zp->scc;
ZWRITE(scc, 2, 0);
ZWRITE(scc, 10, 0);
ZWRITE(scc, 11, 0x50); /* rx & tx clock = brgen */
ZWRITE(scc, 14, 3); /* brgen enabled, from pclk */
zp->imask = zscc_params(scc, par, !(zp->flags & ZS_SCSI));
if( (zp->flags & ZS_SCSI) == 0 )
ZBIS(scc, 5, 0x82); /* set DTR and RTS */
zp->flags |= ZS_INITED;
}
int
zscc_params(scc, par, use_modem_lines)
struct sccregs *scc;
struct termios *par;
int use_modem_lines;
{
unsigned divisor, speed;
int spd, imask, ints;
speed = par->c_ospeed;
if( speed == 0 ){
/* disconnect - drop DTR & RTS, disable receiver */
if( use_modem_lines )
ZBIC(scc, 5, 0x82);
ZBIC(scc, 3, 1);
return 0xFF;
}
if( (par->c_cflag & CREAD) == 0 )
ZBIC(scc, 3, 1); /* disable receiver */
divisor = (PCLK_FREQ/32 + (speed >> 1)) / speed - 2;
ZWRITE(scc, 12, divisor);
ZWRITE(scc, 13, divisor >> 8);
switch( par->c_cflag & CSIZE ){
case CS5: spd = 0; imask = 0x1F; break;
case CS6: spd = 0x40; imask = 0x3F; break;
case CS7: spd = 0x20; imask = 0x7F; break;
default: spd = 0x60; imask = 0xFF;
}
ZWRITE(scc, 5, (scc->s_val[5] & ~0x60) | spd);
ZWRITE(scc, 3, (scc->s_val[3] & ~0xC0) | (spd << 1));
spd = par->c_cflag & CSTOPB? 8: 0;
spd |= par->c_cflag & PARENB? par->c_cflag & PARODD? 1: 3: 0;
ZWRITE(scc, 4, 0x44 | spd);
ZBIS(scc, 5, 8); /* enable transmitter */
if( (par->c_cflag & CREAD) != 0 )
ZBIS(scc, 3, 1); /* enable receiver */
ints = 0;
if( use_modem_lines ){
if( (par->c_cflag & CLOCAL) == 0 )
ints |= SCC_DCD;
if( (par->c_cflag & CCTS_OFLOW) != 0 )
ints |= SCC_CTS;
ZWRITE(scc, 15, ints);
}
return imask;
}
zscc_mget(register struct sccregs *scc)
{
int bits = 0, rr0;
if( (scc->s_val[3] & SCC_RCVEN) != 0 )
bits |= TIOCM_LE;
if( (scc->s_val[5] & SCC_DTR) != 0 )
bits |= TIOCM_DTR;
if( (scc->s_val[5] & SCC_RTS) != 0 )
bits |= TIOCM_RTS;
rr0 = ZREAD0(scc);
if( (rr0 & SCC_CTS) != 0 )
bits |= TIOCM_CTS;
if( (rr0 & SCC_DCD) != 0 )
bits |= TIOCM_CAR;
return bits;
}
zscc_mset(register struct sccregs *scc, int bits)
{
if( (bits & TIOCM_LE) != 0 )
ZBIS(scc, 3, SCC_RCVEN);
if( (bits & TIOCM_DTR) != 0 )
ZBIS(scc, 5, SCC_DTR);
if( (bits & TIOCM_RTS) != 0 )
ZBIS(scc, 5, SCC_RTS);
}
zscc_mclr(register struct sccregs *scc, int bits)
{
if( (bits & TIOCM_LE) != 0 )
ZBIC(scc, 3, SCC_RCVEN);
if( (bits & TIOCM_DTR) != 0 )
ZBIC(scc, 5, TIOCM_DTR);
if( (bits & TIOCM_RTS) != 0 )
ZBIC(scc, 5, SCC_RTS);
}
zs_drain(register struct zs *zp)
{
register int s;
zp->tty->t_state |= TS_DRAIN;
/* wait for Tx buffer empty and All sent bits to be set */
s = splzs();
while( (ZREAD0(&zp->scc) & SCC_TXRDY) == 0
|| (ZREAD(&zp->scc, 1) & 1) == 0 ){
splx(s);
DELAY(100);
s = splzs();
}
splx(s);
}
zs_unblock(register struct tty *tp)
{
tp->t_state &= ~TS_DRAIN;
if( tp->t_outq.c_cc != 0 )
zsstart(tp);
}
/*
* Hardware interrupt from an SCC.
*/
int
zsirq(int unit)
{
struct zssoftc *dv = (struct zssoftc *) zscd.cd_devs[unit];
register struct zs *zp = &dv->zs[0];
register int ipend, x;
register volatile struct scc *scc;
x = splzs();
scc = zp->scc.s_adr;
scc->cr = 3; /* read int pending from A side */
DELAY(5);
ipend = scc->cr;
if( (ipend & 0x20) != 0 )
zs_rxint(zp);
if( (ipend & 0x10) != 0 )
zs_txint(zp);
if( (ipend & 0x8) != 0 )
zs_extint(zp);
++zp; /* now look for B side ints */
if( (ipend & 0x4) != 0 )
zs_rxint(zp);
if( (ipend & 0x2) != 0 )
zs_txint(zp);
if( (ipend & 0x1) != 0 )
zs_extint(zp);
splx(x);
return ipend != 0;
}
zs_txint(register struct zs *zp)
{
struct tty *tp = zp->tty;
struct sccregs *scc;
int c;
u_char *get;
scc = &zp->scc;
ZWRITE0(scc, 0x28); /* reset Tx interrupt */
if( (zp->hflags & ZH_OBLOCK) == 0 ){
get = zp->send_ptr;
while( (ZREAD0(scc) & SCC_TXRDY) != 0 && zp->send_count > 0 ){
c = *get++;
ZWRITED(scc, c);
--zp->send_count;
++zp->sent_count;
}
zp->send_ptr = get;
if( zp->send_count == 0 && (zp->hflags & ZH_TXING) != 0 ){
zp->hflags &= ~ZH_TXING;
zp->hflags |= ZH_SIRQ;
setsoftint(sir_zs);
}
}
}
zs_rxint(register struct zs *zp)
{
register int stat, c, n, extra;
u_char *put;
put = zp->rcv_put;
n = zp->rcv_count;
for(;;){
if( (ZREAD0(&zp->scc) & SCC_RXFULL) == 0 ) /* check Rx full */
break;
stat = ZREAD(&zp->scc, 1) & 0x70;
c = ZREADD(&zp->scc) & zp->imask;
/* stat encodes parity, overrun, framing errors */
if( stat != 0 )
ZWRITE0(&zp->scc, 0x30); /* reset error */
if( (zp->hflags & ZH_RXOVF) != 0 ){
zp->hflags &= ~ZH_RXOVF;
stat |= 0x20;
}
extra = (stat != 0 || c == ERROR_DET)? 2: 0;
if( n + extra + 1 < zp->rcv_len ){
if( extra != 0 ){
*put++ = ERROR_DET;
if( put >= zp->rcv_end )
put = zp->rcv_buf;
*put++ = stat;
if( put >= zp->rcv_end )
put = zp->rcv_buf;
n += 2;
}
*put++ = c;
if( put >= zp->rcv_end )
put = zp->rcv_buf;
++n;
} else
zp->hflags |= ZH_RXOVF;
}
if( n > zp->rcv_count ){
zp->rcv_put = put;
zp->rcv_count = n;
zp->hflags |= ZH_SIRQ;
setsoftint(sir_zs);
}
}
/* Ext/status interrupt */
zs_extint(register struct zs *zp)
{
int rr0;
struct tty *tp = zp->tty;
rr0 = ZREAD0(&zp->scc);
ZWRITE0(&zp->scc, 0x10); /* reset ext/status int */
if( (zp->flags & ZS_SCSI) != 0 )
zs_scsiint(zp, rr0);
else {
if( (tp->t_cflag & CCTS_OFLOW) != 0 && (zp->flags & ZS_SCSI) == 0 ){
if( (rr0 & 0x20) == 0 )
zp->hflags |= ZH_OBLOCK;
else {
zp->hflags &= ~ZH_OBLOCK;
if( (rr0 & SCC_TXRDY) != 0 )
zs_txint(zp);
}
}
zp->modem_change |= rr0 ^ zp->modem_state;
zp->modem_state = rr0;
zp->hflags |= ZH_SIRQ;
setsoftint(sir_zs);
}
}
void
zs_softint()
{
int s, n, n0, c, stat, rr0;
struct zs *zp;
struct tty *tp;
u_char *get;
int unit, side;
s = splzs();
for( unit = 0; unit < zscd.cd_ndevs; ++unit ){
if( zscd.cd_devs[unit] == NULL )
continue;
zp = &((struct zssoftc *) zscd.cd_devs[unit])->zs[0];
for( side = 0; side < 2; ++side, ++zp ){
if( (zp->hflags & ZH_SIRQ) == 0 )
continue;
zp->hflags &= ~ZH_SIRQ;
tp = zp->tty;
/* check for tx done */
spltty();
if( tp != NULL && zp->send_count == 0
&& (tp->t_state & TS_BUSY) != 0 ){
tp->t_state &= ~(TS_BUSY | TS_FLUSH);
ndflush(&tp->t_outq, zp->sent_count);
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_line != 0 )
(*linesw[tp->t_line].l_start)(tp);
else
zsstart(tp);
}
splzs();
/* check for received characters */
get = zp->rcv_get;
while( zp->rcv_count > 0 ){
c = *get++;
if( get >= zp->rcv_end )
get = zp->rcv_buf;
if( c == ERROR_DET ){
stat = *get++;
if( get >= zp->rcv_end )
get = zp->rcv_buf;
c = *get++;
if( get >= zp->rcv_end )
get = zp->rcv_buf;
zp->rcv_count -= 3;
} else {
stat = 0;
--zp->rcv_count;
}
spltty();
if( tp == NULL || (tp->t_state & TS_ISOPEN) == 0 )
continue;
if( zp->nzs_open == 0 ){
if( stat == 0 )
kbd_newchar(zp->gsp_unit, c);
} else {
if( (stat & 0x10) != 0 )
c |= TTY_PE;
if( (stat & 0x20) != 0 ){
log(LOG_WARNING, "zs: fifo overflow\n");
c |= TTY_FE; /* need some error for slip stuff */
}
if( (stat & 0x40) != 0 )
c |= TTY_FE;
(*linesw[tp->t_line].l_rint)(c, tp);
}
splzs();
}
zp->rcv_get = get;
/* check for modem lines changing */
while( zp->modem_change != 0 || zp->modem_state != zp->rr0 ){
rr0 = zp->rr0 ^ zp->modem_change;
zp->modem_change = rr0 ^ zp->modem_state;
/* Check if DCD (carrier detect) has changed */
if( tp != NULL && (rr0 & 8) != (zp->rr0 & 8) ){
spltty();
ttymodem(tp, rr0 & 8);
/* XXX possibly should disable line if return value is 0 */
splzs();
}
zp->rr0 = rr0;
}
}
}
splx(s);
}
/*
* Routines to divert an SCC channel to the input side of /dev/gsp
* for the keyboard.
*/
int
zs_kbdopen(int unit, int gsp_unit, struct termios *tiop, struct proc *p)
{
struct zssoftc *dv = (struct zssoftc *) zscd.cd_devs[zsunit(unit)];
struct zs *zp = &dv->zs[zsside(unit)];
int error;
error = zsopen(unit, 0, 0, p);
if( error != 0 )
return error;
++zp->nkbd_open;
--zp->nzs_open;
zsparam(zp->tty, tiop);
zp->gsp_unit = gsp_unit;
return 0;
}
void
zs_kbdclose(int unit)
{
struct zssoftc *dv = (struct zssoftc *) zscd.cd_devs[zsunit(unit)];
struct zs *zp = &dv->zs[zsside(unit)];
zp->nkbd_open = 0;
if( zp->nzs_open == 0 )
zsclose(unit, 0, 0, 0);
}
void
zs_kbdput(int unit, int c)
{
struct zssoftc *dv = (struct zssoftc *) zscd.cd_devs[zsunit(unit)];
struct zs *zp = &dv->zs[zsside(unit)];
struct tty *tp = zp->tty;
putc(c, &tp->t_outq);
zsstart(tp);
}
/*
* Routines for controlling the SBIC through the modem control
* lines of an SCC.
*
* Interrupts from the SCSI Bus Interface Controller (sbic)
* come in through the DCD input of the keyboard SCC. Other
* lines are connected as follows: CTS to the SBIC data
* request (DRQ) output, RTS to the SCSI bus RESET line and
* the SBIC MR (master reset) input, and DTR to the SBIC
* DMA acknowledge input.
*/
zs_scsiint(struct zs *zp, int rr0)
{
ZWRITE(&zp->scc, 15, 0); /* clear ext/status IEs */
ZBIC(&zp->scc, 1, 1); /* disable ext/status int */
setsoftscsi(); /* post soft int for SCSI */
}
sbic_int_enable()
{
register struct sccregs *scc;
register int x;
if( zs_scsi == NULL )
panic("SCC controlling SBIC not configured");
scc = &zs_scsi->scc;
x = splzs();
ZWRITE(scc, 15, SCC_DCD|SCC_CTS); /* enable ints from DCD & CTS */
ZBIS(scc, 1, 1); /* ext/status master IE */
ZBIS(scc, 9, 8); /* SCC master IE */
splx(x);
}
sbic_int_disable()
{
register struct sccregs *scc;
register int x;
scc = &zs_scsi->scc;
x = splzs();
ZWRITE(scc, 15, 0); /* disable ext/status ints */
ZBIC(scc, 1, 1);
splx(x);
}
sbic_reset_scsi(int reset_on)
{
register struct sccregs *scc;
register int x;
scc = &zs_scsi->scc;
x = splzs();
if( reset_on )
ZBIS(scc, 5, SCC_RTS); /* assert RTS line */
else
ZBIC(scc, 5, SCC_RTS); /* negate RTS line */
splx(x);
}
sbic_assert_dack(int dack_on)
{
register struct sccregs *scc;
register int x;
scc = &zs_scsi->scc;
x = splzs();
if( dack_on )
ZBIS(scc, 5, SCC_DTR); /* assert DTR line */
else
ZBIC(scc, 5, SCC_DTR); /* negate DTR line */
splx(x);
}
/*
* Routines for using side A of the first SCC as a console.
*/
/* probe for the SCC; should check hardware */
zscnprobe(cp)
struct consdev *cp;
{
int maj;
char *prom_cons;
extern char *prom_getvar();
/* locate the major number */
for (maj = 0; maj < nchrdev; maj++)
if (cdevsw[maj].d_open == zsopen)
break;
/* initialize required fields */
cp->cn_dev = makedev(maj, 0);
cp->cn_pri = CN_NORMAL;
prom_cons = prom_getvar("console");
if( prom_cons != NULL && strcmp(prom_cons, "0") == 0 )
cp->cn_pri = CN_REMOTE;
return 1;
}
/* initialize the keyboard for use as the console */
struct termios zscn_termios = {
TTYDEF_IFLAG,
TTYDEF_OFLAG,
TTYDEF_CFLAG,
TTYDEF_LFLAG,
{0},
TTYDEF_SPEED,
TTYDEF_SPEED
};
struct sccregs zs_cons_sccregs;
int zs_cons_imask;
unsigned zs_cons_addrs[] = {0xE00000, 0xE10000};
zscninit()
{
zs_cnsetup(0, &zscn_termios);
}
/* Polling routine for console input from a serial port. */
int
zscngetc(dev_t dev)
{
register struct sccregs *scc = zs_cons_scc;
int c, s, stat;
s = splzs();
for(;;){
while( (ZREAD0(scc) & SCC_RXFULL) == 0 ) /* wait for Rx full */
;
stat = ZREAD(scc, 1) & 0x70;
c = ZREADD(scc) & zs_cons_imask;
/* stat encodes parity, overrun, framing errors */
if( stat == 0 )
break;
ZWRITE0(scc, 0x30); /* reset error */
}
splx(s);
return c;
}
zscnputc(dev_t dev, int c)
{
register struct sccregs *scc = zs_cons_scc;
int s;
s = splzs();
while( (ZREAD0(scc) & SCC_TXRDY) == 0 )
;
ZWRITED(scc, c);
splx(s);
}
zs_cnsetup(int unit, struct termios *tiop)
{
register volatile struct scc *scc_adr;
register struct sccregs *scc;
zs_cons_unit = unit;
zs_is_console = 1;
zs_cons_scc = scc = &zs_cons_sccregs;
scc_adr = (volatile struct scc *) IIOV(zs_cons_addrs[zsunit(unit)]);
scc_adr[1].cr = 0;
scc_adr[1].cr = 9;
scc_adr[1].cr = 0xC0; /* hardware reset of SCC, both sides */
if( !zsside(unit) )
++scc_adr;
scc->s_adr = scc_adr;
ZWRITE(scc, 2, 0);
ZWRITE(scc, 10, 0);
ZWRITE(scc, 11, 0x50); /* rx & tx clock = brgen */
ZWRITE(scc, 14, 3); /* brgen enabled, from pclk */
zs_cons_imask = zscc_params(scc, tiop, unit != SCSI_UNIT);
if( unit != SCSI_UNIT )
ZBIS(scc, 5, 0x82); /* set DTR and RTS */
zs_cons_termios = *tiop; /* save for later */
}
/*
* Routines for using the keyboard SCC as the input side of
* the 'gsp' console device.
*/
/* probe for the keyboard; should check hardware */
zs_kbdcnprobe(cp, unit)
struct consdev *cp;
int unit;
{
return (unsigned) unit < NZSLINE;
}
#endif /* NZS */
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