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freebsd-dev/sys/dev/sx/sx.c

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/*-
* Device tsfsdriver for Specialix I/O8+ multiport serial card.
*
* Copyright 2003 Frank Mayhar <frank@exit.com>
*
* Derived from the "si" driver by Peter Wemm <peter@netplex.com.au>, using
* lots of information from the Linux "specialix" driver by Roger Wolff
* <R.E.Wolff@BitWizard.nl> and from the Intel CD1865 "Intelligent Eight-
* Channel Communications Controller" datasheet. Roger was also nice
* enough to answer numerous questions about stuff specific to the I/O8+
* not covered by the CD1865 datasheet.
*
* 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
* notices, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notices, this list of conditions and the foljxowing disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY ``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 AUTHORS BE LIABLE.
*
* $FreeBSD$
*/
/* Main tty driver routines for the Specialix I/O8+ device driver. */
#include "opt_compat.h"
#include "opt_debug_sx.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/callout.h>
#include <sys/conf.h>
#include <sys/proc.h>
#include <sys/conf.h>
#include <sys/fcntl.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/serial.h>
#include <sys/sysctl.h>
#include <sys/tty.h>
#include <sys/bus.h>
#include <machine/bus.h>
#include <sys/rman.h>
#include <machine/resource.h>
#include <machine/stdarg.h>
#include <dev/sx/cd1865.h>
#include <dev/sx/sxvar.h>
#include <dev/sx/sx.h>
#include <dev/sx/sx_util.h>
#define SX_BROKEN_CTS
static t_modem_t sx_modem;
static void sx_start(struct tty *);
static void sx_stop(struct tty *, int);
static t_close_t sxclose;
static t_open_t sxopen;
static void sx_shutdown_chan(struct sx_port *);
static t_break_t sxbreak;
static int sxparam(struct tty *, struct termios *);
static void sx_modem_state(struct sx_softc *sc, struct sx_port *pp, int card);
static int sx_debug = 0; /* DBG_ALL|DBG_PRINTF|DBG_MODEM|DBG_IOCTL|DBG_PARAM;e */
SYSCTL_INT(_machdep, OID_AUTO, sx_debug, CTLFLAG_RW, &sx_debug, 0, "");
static int sx_numunits;
devclass_t sx_devclass;
/*
* See sx.h for these values.
*/
static struct speedtab bdrates[] = {
{ B75, CLK75, },
{ B110, CLK110, },
{ B150, CLK150, },
{ B300, CLK300, },
{ B600, CLK600, },
{ B1200, CLK1200, },
{ B2400, CLK2400, },
{ B4800, CLK4800, },
{ B9600, CLK9600, },
{ B19200, CLK19200, },
{ B38400, CLK38400, },
{ B57600, CLK57600, },
{ B115200, CLK115200, },
{ -1, -1 },
};
/*
* Approximate (rounded) character per second rates. Translated at card
* initialization time to characters per clock tick.
*/
static int done_chartimes = 0;
static struct speedtab chartimes[] = {
{ B75, 8, },
{ B110, 11, },
{ B150, 15, },
{ B300, 30, },
{ B600, 60, },
{ B1200, 120, },
{ B2400, 240, },
{ B4800, 480, },
{ B9600, 960, },
{ B19200, 1920, },
{ B38400, 3840, },
{ B57600, 5760, },
{ B115200, 11520, },
{ -1, -1 },
};
static volatile int in_interrupt = 0; /* Inside interrupt handler? */
static int sx_flags; /* The flags we were configured with. */
SYSCTL_INT(_machdep, OID_AUTO, sx_flags, CTLFLAG_RW, &sx_flags, 0, "");
#ifdef POLL
static int sx_pollrate; /* in addition to irq */
static int sx_realpoll = 0; /* poll HW on timer */
SYSCTL_INT(_machdep, OID_AUTO, sx_pollrate, CTLFLAG_RW, &sx_pollrate, 0, "");
SYSCTL_INT(_machdep, OID_AUTO, sx_realpoll, CTLFLAG_RW, &sx_realpoll, 0, "");
static int init_finished = 0;
static void sx_poll(void *);
#endif
/*
* sxattach()
* Initialize and attach the card, initialize the driver.
*
* Description:
* This is the standard attach routine. It initializes the I/O8+
* card, identifies the chip on that card, then allocates and
* initializes the various data structures used by the driver
* itself.
*/
int
sxattach(
device_t dev)
{
int unit;
struct sx_softc *sc;
struct tty *tp;
struct speedtab *spt;
int chip, x;
char rev;
int error;
sc = device_get_softc(dev);
unit = device_get_unit(dev);
sx_flags = device_get_flags(dev);
if (sx_numunits < unit + 1)
sx_numunits = unit + 1;
DPRINT((0, DBG_AUTOBOOT, "sx%d: sxattach\n", unit));
/* Reset the CD1865. */
if ((error = sx_init_cd1865(sc, unit)) != 0) {
return(error);
}
/*
* ID the chip:
*
* Chip revcode pkgtype
* GFRCR SRCR bit 7
* CD180 rev B 0x81 0
* CD180 rev C 0x82 0
* CD1864 rev A 0x82 1
* CD1865 rev A 0x83 1 -- Do not use!!! Does not work.
* CD1865 rev B 0x84 1
* -- Thanks to Gwen Wang, Cirrus Logic (via Roger Wollf).
*/
switch (sx_cd1865_in(sc, CD1865_GFRCR)) {
case 0x82:
chip = 1864;
rev = 'A';
break;
case 0x83:
chip = 1865;
rev = 'A';
break;
case 0x84:
chip = 1865;
rev = 'B';
break;
case 0x85:
chip = 1865;
rev = 'C';
break;
default:
chip = -1;
rev = '\0';
break;
}
if (bootverbose && chip != -1)
printf("sx%d: Specialix I/O8+ CD%d processor rev %c\n",
unit, chip, rev);
DPRINT((0, DBG_AUTOBOOT, "sx%d: GFRCR 0x%02x\n",
unit, sx_cd1865_in(sc, CD1865_GFRCR)));
#ifdef POLL
if (sx_pollrate == 0) {
sx_pollrate = POLLHZ; /* in addition to irq */
#ifdef REALPOLL
sx_realpoll = 1; /* scan always */
#endif
}
#endif
sc->sc_ports = (struct sx_port *)malloc(
sizeof(struct sx_port) * SX_NUMCHANS,
M_DEVBUF,
M_NOWAIT);
if (sc->sc_ports == NULL) {
printf("sx%d: No memory for sx_port structs!\n", unit);
return(EINVAL);
}
bzero(sc->sc_ports, sizeof(struct sx_port) * SX_NUMCHANS);
/*
* Initialize the channels.
*/
for (x = 0; x < SX_NUMCHANS; x++) {
tp = ttyalloc();
tp->t_oproc = sx_start;
tp->t_stop = sx_stop;
tp->t_param = sxparam;
tp->t_break = sxbreak;
tp->t_open = sxopen;
tp->t_close = sxclose;
sc->sc_ports[x].sp_tty = tp;
sc->sc_ports[x].sp_state = 0; /* internal flag */
sc->sc_ports[x].sp_chan = x;
sc->sc_ports[x].sp_sc = sc;
tp->t_sc = &sc->sc_ports[x];
ttycreate(tp, NULL, 0, MINOR_CALLOUT, "G%r%r", unit, x);
}
if (done_chartimes == 0) {
for (spt = chartimes ; spt->sp_speed != -1; spt++) {
if ((spt->sp_code /= hz) == 0)
spt->sp_code = 1;
}
done_chartimes = 1;
}
return (0);
}
static int
sxopen(struct tty *tp, struct cdev *dev)
{
#ifdef POLL
/*
* We've now got a device, so start the poller.
*/
if (init_finished == 0) {
timeout(sx_poll, (caddr_t)0L, sx_pollrate);
init_finished = 1;
}
#endif
return (0);
}
/*
* sxclose()
* Do hard-close processing.
*
* Description:
* Called on last close. Handle DTR and RTS, do cleanup. If we have
* pending output in the FIFO, wait for it to clear before we shut down
* the hardware.
*/
static void
sxclose(struct tty *tp)
{
struct sx_port *pp;
struct sx_softc *sc;
int oldspl, dcd;
oldspl = spltty();
pp = tp->t_sc;
DPRINT((pp, DBG_CLOSE, "sxhardclose sp_state:%x\n", pp->sp_state));
sc = pp->sp_sc;
dcd = sx_modem(tp, 0, 0) & SER_DCD;
if (tp->t_cflag & HUPCL ||
(!tp->t_actout && !dcd && !(tp->t_init_in.c_cflag && CLOCAL)) ||
!(tp->t_state & TS_ISOPEN)) {
disable_intr();
sx_cd1865_out(sc, CD1865_CAR, pp->sp_chan);
if (sx_cd1865_in(sc, CD1865_IER|SX_EI) & CD1865_IER_TXRDY) {
sx_cd1865_bic(sc, CD1865_IER, CD1865_IER_TXRDY);
sx_cd1865_bis(sc, CD1865_IER, CD1865_IER_TXEMPTY);
enable_intr();
splx(oldspl);
ttysleep(tp, (caddr_t)pp,
TTOPRI|PCATCH, "sxclose", tp->t_timeout);
oldspl = spltty();
}
else {
enable_intr();
}
(void)sx_modem(tp, 0, SER_DTR | SER_RTS);
}
(void)sx_shutdown_chan(pp); /* Turn off the hardware. */
tp->t_actout = FALSE;
wakeup((caddr_t)&tp->t_actout);
wakeup(TSA_CARR_ON(tp));
splx(oldspl);
}
static void
sxbreak(struct tty *tp, int sig)
{
struct sx_port *pp;
pp = tp->t_sc;
if (sig) {
/*
* If there's already a break state change pending or
* we're already sending a break, just ignore this.
* Otherwise, just set our flag and start the
* transmitter.
*/
if (!SX_DOBRK(pp) && !SX_BREAK(pp)) {
pp->sp_state |= SX_SS_DOBRK;
sx_start(tp);
}
} else {
/*
* If a break is going, set our flag so we turn it off
* when we can, then kick the transmitter. If a break
* isn't going and the flag is set, turn it off.
*/
if (SX_BREAK(pp)) {
pp->sp_state |= SX_SS_DOBRK;
sx_start(tp);
}
else {
if (SX_DOBRK(pp))
pp->sp_state &= SX_SS_DOBRK;
}
}
}
/*
* sxparam()
* Configure line parameters.
*
* Description:
* Configure the bitrate, wordsize, flow control and various other serial
* port parameters for this line.
*
* Environment:
* Called at spltty(); this may sleep, does not flush nor wait for drain,
* nor block writes. Caller must arrange this if it's important..
*/
static int
sxparam(
struct tty *tp,
struct termios *t)
{
struct sx_softc *sc;
struct sx_port *pp = tp->t_sc;
int oldspl, cflag, iflag, oflag, lflag;
int error = 0;
int ispd = 0;
int ospd = 0;
unsigned char val, cor1, cor2, cor3, ier;
sc = pp->sp_sc;
DPRINT((pp, DBG_ENTRY|DBG_PARAM, "sxparam %x/%x\n", tp, t));
cflag = t->c_cflag;
iflag = t->c_iflag;
oflag = t->c_oflag;
lflag = t->c_lflag;
DPRINT((pp, DBG_PARAM, "OF 0x%x CF 0x%x IF 0x%x LF 0x%x\n",
oflag, cflag, iflag, lflag));
/* If the port isn't hung up... */
if (t->c_ospeed != 0) {
/* Convert bit rate to hardware divisor values. */
ospd = ttspeedtab(t->c_ospeed, bdrates);
ispd = t->c_ispeed ? ttspeedtab(t->c_ispeed, bdrates) : ospd;
/* We only allow standard bit rates. */
if (ospd < 0 || ispd < 0)
return(EINVAL);
}
oldspl = spltty(); /* Block other activity. */
cor1 = 0;
cor2 = 0;
cor3 = 0;
ier = CD1865_IER_RXD | CD1865_IER_CD;
#ifdef notyet
/* We don't yet handle this stuff. */
val = 0;
if (iflag & IGNBRK) /* Breaks */
val |= BR_IGN;
if (iflag & BRKINT) /* Interrupt on break? */
val |= BR_INT;
if (iflag & PARMRK) /* Parity mark? */
val |= BR_PARMRK;
#endif /* notyet */
/*
* If the device isn't hung up, set the serial port bitrates.
*/
if (t->c_ospeed != 0) {
disable_intr();
sx_cd1865_out(sc, CD1865_CAR|SX_EI, pp->sp_chan);
sx_cd1865_out(sc, CD1865_RBPRH|SX_EI, (ispd >> 8) & 0xff);
sx_cd1865_out(sc, CD1865_RBPRL|SX_EI, ispd & 0xff);
sx_cd1865_out(sc, CD1865_TBPRH|SX_EI, (ospd >> 8) & 0xff);
sx_cd1865_out(sc, CD1865_TBPRL|SX_EI, ospd & 0xff);
enable_intr();
}
if (cflag & CSTOPB) /* Two stop bits? */
cor1 |= CD1865_COR1_2SB; /* Yep. */
/*
* Parity settings.
*/
val = 0;
if (cflag & PARENB) { /* Parity enabled? */
val = CD1865_COR1_NORMPAR; /* Turn on normal parity handling. */
if (cflag & PARODD) /* Odd Parity? */
val |= CD1865_COR1_ODDP; /* Turn it on. */
}
else
val = CD1865_COR1_NOPAR; /* Turn off parity detection. */
cor1 |= val;
if (iflag & IGNPAR) /* Ignore chars with parity errors? */
cor1 |= CD1865_COR1_IGNORE;
/*
* Set word length.
*/
if ((cflag & CS8) == CS8)
val = CD1865_COR1_8BITS;
else if ((cflag & CS7) == CS7)
val = CD1865_COR1_7BITS;
else if ((cflag & CS6) == CS6)
val = CD1865_COR1_6BITS;
else
val = CD1865_COR1_5BITS;
cor1 |= val;
/*
* Enable hardware RTS/CTS flow control. We can handle output flow
* control at any time, since we have a dedicated CTS pin.
* Unfortunately, though, the RTS pin is really the DTR pin. This
* means that we can't ever use the automatic input flow control of
* the CD1865 and that we can only use the pin for input flow
* control when it's wired as RTS.
*/
if (cflag & CCTS_OFLOW) { /* Output flow control... */
pp->sp_state |= SX_SS_OFLOW;
#ifdef SX_BROKEN_CTS
disable_intr();
sx_cd1865_out(sc, CD1865_CAR|SX_EI, pp->sp_chan);
if (sx_cd1865_in(sc, CD1865_MSVR|SX_EI) & CD1865_MSVR_CTS) {
enable_intr();
pp->sp_state |= SX_SS_OSTOP;
}
else {
enable_intr();
}
ier |= CD1865_IER_CTS;
#else /* SX_BROKEN_CTS */
cor2 |= CD1865_COR2_CTSAE; /* Set CTS automatic enable. */
#endif /* SX_BROKEN_CTS */
}
else {
pp->sp_state &= ~SX_SS_OFLOW;
}
if (cflag & CRTS_IFLOW && !SX_DTRPIN(pp)) /* Input flow control. */
pp->sp_state |= SX_SS_IFLOW;
else
pp->sp_state &= ~SX_SS_IFLOW;
if (iflag & IXANY)
cor2 |= CD1865_COR2_IXM; /* Any character is XON. */
if (iflag & IXOFF) {
cor2 |= CD1865_COR2_TXIBE; /* Enable inband flow control.*/
cor3 |= CD1865_COR3_FCT | CD1865_COR3_SCDE; /* Hide from host */
disable_intr();
sx_cd1865_out(sc, CD1865_CAR|SX_EI, pp->sp_chan); /* Sel chan.*/
sx_cd1865_out(sc, CD1865_SCHR1|SX_EI, t->c_cc[VSTART]);
sx_cd1865_out(sc, CD1865_SCHR2|SX_EI, t->c_cc[VSTOP]);
sx_cd1865_out(sc, CD1865_SCHR3|SX_EI, t->c_cc[VSTART]);
sx_cd1865_out(sc, CD1865_SCHR4|SX_EI, t->c_cc[VSTOP]);
enable_intr();
}
/*
* All set, now program the hardware.
*/
disable_intr();
sx_cd1865_out(sc, CD1865_CAR|SX_EI, pp->sp_chan); /* Select channel. */
sx_cd1865_out(sc, CD1865_COR1|SX_EI, cor1);
sx_cd1865_out(sc, CD1865_COR2|SX_EI, cor2);
sx_cd1865_out(sc, CD1865_COR3|SX_EI, cor3);
sx_cd1865_wait_CCR(sc, SX_EI);
sx_cd1865_out(sc, CD1865_CCR|SX_EI,
CD1865_CCR_CORCHG1|CD1865_CCR_CORCHG2|CD1865_CCR_CORCHG3);
sx_cd1865_wait_CCR(sc, SX_EI);
enable_intr();
if (SX_DTRPIN(pp))
val = SER_DTR;
else
val = SER_RTS;
if (t->c_ospeed == 0) /* Clear DTR/RTS if we're hung up. */
(void)sx_modem(tp, 0, val);
else /* If we were hung up, we may have to */
(void)sx_modem(tp, 0, val);
/*
* Last, enable the receiver and transmitter and turn on the
* interrupts we need (receive, carrier-detect and possibly CTS
* (iff we're built with SX_BROKEN_CTS and CCTS_OFLOW is on).
*/
disable_intr();
sx_cd1865_out(sc, CD1865_CAR|SX_EI, pp->sp_chan); /* Select channel. */
sx_cd1865_wait_CCR(sc, SX_EI);
sx_cd1865_out(sc, CD1865_CCR|SX_EI, CD1865_CCR_RXEN|CD1865_CCR_TXEN);
sx_cd1865_wait_CCR(sc, SX_EI);
sx_cd1865_out(sc, CD1865_IER|SX_EI, ier);
enable_intr();
DPRINT((pp, DBG_PARAM, "sxparam out\n"));
splx(oldspl);
return(error);
}
/*
* sx_shutdown_chan()
* Shut down a channel on the I/O8+.
*
* Description:
* This does all hardware shutdown processing for a channel on the I/O8+.
* It is called from sxhardclose(). We reset the channel and turn off
* interrupts.
*/
static void
sx_shutdown_chan(
struct sx_port *pp)
{
int s;
struct sx_softc *sc;
DPRINT((pp, DBG_ENTRY, "sx_shutdown_chan %x %x\n", pp, pp->sp_state));
sc = pp->sp_sc;
s = spltty();
disable_intr();
sx_cd1865_out(sc, CD1865_CAR, pp->sp_chan); /* Select channel. */
sx_cd1865_wait_CCR(sc, 0); /* Wait for any commands to complete. */
sx_cd1865_out(sc, CD1865_CCR, CD1865_CCR_SOFTRESET); /* Reset chan. */
sx_cd1865_wait_CCR(sc, 0);
sx_cd1865_out(sc, CD1865_IER, 0); /* Disable all interrupts. */
enable_intr();
splx(s);
}
/*
* sx_modem()
* Set/Get state of modem control lines.
*
* Description:
* Get and set the state of the modem control lines that we have available
* on the I/O8+. The only lines we are guaranteed to have are CD and CTS.
* We have DTR if the "DTR/RTS pin is DTR" flag is set, otherwise we have
* RTS through the DTR pin.
*/
static int
sx_modem(struct tty *tp, int sigon, int sigoff)
{
int s, x;
struct sx_softc *sc;
struct sx_port *pp;
pp = tp->t_sc;
sc = pp->sp_sc;
s = spltty(); /* Block interrupts. */
disable_intr();
sx_cd1865_out(sc, CD1865_CAR|SX_EI, pp->sp_chan); /* Select our port. */
x = sx_cd1865_in(sc, CD1865_MSVR|SX_EI); /* Get the current signals. */
#ifdef SX_DEBUG
DPRINT((pp, DBG_MODEM, "sx_modem MSVR 0x%x, CCSR %x GIVR %x SRSR %x\n",
x, sx_cd1865_in(sc, CD1865_CCSR|SX_EI),
sx_cd1865_in(sc, CD1865_GIVR|SX_EI),
sx_cd1865_in(sc, CD1865_SRSR|SX_EI)));
#endif
enable_intr(); /* Allow other interrupts. */
if (sigon == 0 && sigoff == 0) {
if ((x & CD1865_MSVR_CD) == 0)
sigon |= SER_DCD;
if ((x & CD1865_MSVR_CTS) == 0)
sigon |= SER_CTS;
if ((x & CD1865_MSVR_DTR) == 0) {
if (SX_DTRPIN(pp)) /* Odd pin is DTR? */
sigon |= SER_DTR; /* Report DTR. */
else /* Odd pin is RTS. */
sigon |= SER_RTS; /* Report RTS. */
}
return (sigon);
}
if ((sigon & SER_RTS && !SX_DTRPIN(pp)) ||
(sigon & SER_DTR && SX_DTRPIN(pp)))
x &= ~CD1865_MSVR_DTR;
if ((sigoff & SER_RTS && !SX_DTRPIN(pp)) ||
(sigoff & SER_DTR && SX_DTRPIN(pp)))
x |= CD1865_MSVR_DTR;
disable_intr();
/*
* Set the new modem signals.
*/
sx_cd1865_out(sc, CD1865_CAR|SX_EI, pp->sp_chan);
sx_cd1865_out(sc, CD1865_MSVR|SX_EI, x);
enable_intr();
splx(s);
return 0;
}
#ifdef POLL
/*
* sx_poll()
* Poller to catch missed interrupts.
*
* Description:
* Only used if we're complied with POLL. This routine is called every
* sx_pollrate ticks to check for missed interrupts. We check each card
* in the system; if we missed an interrupt, we complain about each one
* and later call sx_intr() to handle them.
*/
static void
sx_poll(
void *dummy)
{
struct sx_softc *sc;
struct sx_port *pp;
int card, lost, oldspl, chan;
DPRINT((0, DBG_POLL, "sx_poll\n"));
oldspl = spltty();
if (in_interrupt)
goto out;
lost = 0;
for (card = 0; card < sx_numunits; card++) {
sc = devclass_get_softc(sx_devclass, card);
if (sc == NULL)
continue;
if (sx_cd1865_in(sc, CD1865_SRSR|SX_EI) & CD1865_SRSR_REQint) {
printf("sx%d: lost interrupt\n", card);
lost++;
}
/*
* Gripe about no input flow control.
*/
for (chan = 0; chan < SX_NUMCHANS; pp++, chan++) {
pp = &(sc->sc_ports[chan]);
if (pp->sp_delta_overflows > 0) {
printf("sx%d: %d tty level buffer overflows\n",
card, pp->sp_delta_overflows);
pp->sp_delta_overflows = 0;
}
}
}
if (lost || sx_realpoll)
sx_intr(NULL); /* call intr with fake vector */
out: splx(oldspl);
timeout(sx_poll, (caddr_t)0L, sx_pollrate);
}
#endif /* POLL */
/*
* sx_transmit()
* Handle transmit request interrupt.
*
* Description:
* This routine handles the transmit request interrupt from the CD1865
* chip on the I/O8+ card. The CD1865 interrupts us for a transmit
* request under two circumstances: When the last character in the
* transmit FIFO is sent and the channel is ready for more characters
* ("transmit ready"), or when the last bit of the last character in the
* FIFO is actually transmitted ("transmit empty"). In the former case,
* we just pass processing off to sx_start() (via the line discipline)
* to queue more characters. In the latter case, we were waiting for
* the line to flush in sxhardclose() so we need to wake the sleeper.
*/
static void
sx_transmit(
struct sx_softc *sc,
struct sx_port *pp,
int card)
{
struct tty *tp;
unsigned char flags;
tp = pp->sp_tty;
/*
* Let others know what we're doing.
*/
pp->sp_state |= SX_SS_IXMIT;
/*
* Get the service request enable register to see what we're waiting
* for.
*/
flags = sx_cd1865_in(sc, CD1865_SRER|SX_EI);
DPRINT((pp, DBG_TRANSMIT, "sx_xmit %x SRER %x\n", tp, flags));
/*
* "Transmit ready." The transmit FIFO is empty (but there are still
* two characters being transmitted), so we need to tell the line
* discipline to send more.
*/
if (flags & CD1865_IER_TXRDY) {
ttyld_start(tp);
pp->sp_state &= ~SX_SS_IXMIT;
DPRINT((pp, DBG_TRANSMIT, "sx_xmit TXRDY out\n"));
return;
}
/*
* "Transmit empty." The transmitter is completely empty; turn off the
* service request and wake up the guy in sxhardclose() who is waiting
* for this.
*/
if (flags & CD1865_IER_TXEMPTY) {
flags &= ~CD1865_IER_TXEMPTY;
sx_cd1865_out(sc, CD1865_CAR|SX_EI, pp->sp_chan);
sx_cd1865_out(sc, CD1865_SRER|SX_EI, flags);
wakeup((caddr_t)pp);
}
pp->sp_state &= ~SX_SS_IXMIT;
DPRINT((pp, DBG_TRANSMIT, "sx_xmit out\n"));
}
/*
* sx_modem_state()
* Handle modem state-change request interrupt.
*
* Description:
* Handles changed modem signals CD and CTS. We pass the CD change
* off to the line discipline. We can't handle DSR since there isn't a
* pin for it.
*/
static void
sx_modem_state(
struct sx_softc *sc,
struct sx_port *pp,
int card)
{
struct tty *tp;
unsigned char mcr;
/*
* Let others know what we're doing.
*/
pp->sp_state |= SX_SS_IMODEM;
tp = pp->sp_tty;
/* Grab the Modem Change Register. */
mcr = sx_cd1865_in(sc, CD1865_MCR|SX_EI);
DPRINT((pp, DBG_MODEM_STATE,
"sx_mdmst %x st %x sp %x mcr %x\n",
tp, tp->t_state, pp->sp_state, mcr));
if (mcr & CD1865_MCR_CDCHG) { /* CD changed? */
if ((sx_cd1865_in(sc, CD1865_MSVR) & CD1865_MSVR_CD) == 0) {
DPRINT((pp, DBG_INTR, "modem carr on t_line %d\n",
tp->t_line));
(void)ttyld_modem(tp, 1);
}
else { /* CD went down. */
DPRINT((pp, DBG_INTR, "modem carr off\n"));
if (ttyld_modem(tp, 0))
(void)sx_modem(tp, 0, SER_DTR | SER_RTS);
}
}
#ifdef SX_BROKEN_CTS
if (mcr & CD1865_MCR_CTSCHG) { /* CTS changed? */
if (sx_cd1865_in(sc, CD1865_MSVR|SX_EI) & CD1865_MSVR_CTS) {
pp->sp_state |= SX_SS_OSTOP;
sx_cd1865_bic(sc, CD1865_IER|SX_EI, CD1865_IER_TXRDY);
}
else {
pp->sp_state &= ~SX_SS_OSTOP;
sx_cd1865_bis(sc, CD1865_IER|SX_EI, CD1865_IER_TXRDY);
}
}
#endif /* SX_BROKEN_CTS */
/* Clear state-change indicator bits. */
sx_cd1865_out(sc, CD1865_MCR|SX_EI, 0);
pp->sp_state &= ~SX_SS_IMODEM;
}
/*
* sx_receive()
* Handle receive request interrupt.
*
* Description:
* Handle a receive request interrupt from the CD1865. This is just a
* standard "we have characters to process" request, we don't have to
* worry about exceptions like BREAK and such. Exceptions are handled
* by sx_receive_exception().
*/
static void
sx_receive(
struct sx_softc *sc,
struct sx_port *pp,
int card)
{
struct tty *tp;
unsigned char count;
int i, x;
static unsigned char sx_rxbuf[SX_BUFFERSIZE]; /* input staging area */
tp = pp->sp_tty;
DPRINT((pp, DBG_RECEIVE,
"sx_rcv %x st %x sp %x\n",
tp, tp->t_state, pp->sp_state));
/*
* Let others know what we're doing.
*/
pp->sp_state |= SX_SS_IRCV;
/*
* How many characters are waiting for us?
*/
count = sx_cd1865_in(sc, CD1865_RDCR|SX_EI);
if (count == 0) /* None? Bail. */
return;
DPRINT((pp, DBG_RECEIVE, "sx_receive count %d\n", count));
/*
* Pull the characters off the card into our local buffer, then
* process that.
*/
for (i = 0; i < count; i++)
sx_rxbuf[i] = sx_cd1865_in(sc, CD1865_RDR|SX_EI);
/*
* If we're not open and connected, bail.
*/
if (!(tp->t_state & TS_CONNECTED && tp->t_state & TS_ISOPEN)) {
pp->sp_state &= ~SX_SS_IRCV;
DPRINT((pp, DBG_RECEIVE, "sx_rcv not open\n"));
return;
}
/*
* If the tty input buffers are blocked and we have an RTS pin,
* drop RTS and bail.
*/
if (tp->t_state & TS_TBLOCK) {
if (!SX_DTRPIN(pp) && SX_IFLOW(pp)) {
(void)sx_modem(tp, 0, SER_RTS);
pp->sp_state |= SX_SS_ISTOP;
}
pp->sp_state &= ~SX_SS_IRCV;
return;
}
if (tp->t_state & TS_CAN_BYPASS_L_RINT) {
DPRINT((pp, DBG_RECEIVE, "sx_rcv BYPASS\n"));
/*
* Avoid the grotesquely inefficient lineswitch routine
* (ttyinput) in "raw" mode. It usually takes about 450
* instructions (that's without canonical processing or
* echo!). slinput is reasonably fast (usually 40
* instructions plus call overhead).
*/
if (tp->t_rawq.c_cc + count >= SX_I_HIGH_WATER &&
(tp->t_cflag & CRTS_IFLOW || tp->t_iflag & IXOFF) &&
!(tp->t_state & TS_TBLOCK)) {
ttyblock(tp);
DPRINT((pp, DBG_RECEIVE, "sx_rcv block\n"));
}
tk_nin += count;
tk_rawcc += count;
tp->t_rawcc += count;
pp->sp_delta_overflows +=
b_to_q((char *)sx_rxbuf, count, &tp->t_rawq);
ttwakeup(tp);
/*
* If we were stopped and need to start again because of this
* receive, kick the output routine to get things going again.
*/
if (tp->t_state & TS_TTSTOP && (tp->t_iflag & IXANY ||
tp->t_cc[VSTART] == tp->t_cc[VSTOP])) {
tp->t_state &= ~TS_TTSTOP;
tp->t_lflag &= ~FLUSHO;
sx_start(tp);
}
}
else {
DPRINT((pp, DBG_RECEIVE, "sx_rcv l_rint\n"));
/*
* It'd be nice to not have to go through the function call
* overhead for each char here. It'd be nice to block input
* it, saving a loop here and the call/return overhead.
*/
for (x = 0; x < count; x++) {
i = sx_rxbuf[x];
if (ttyld_rint(tp, i) == -1)
pp->sp_delta_overflows++;
}
}
pp->sp_state &= ~SX_SS_IRCV;
DPRINT((pp, DBG_RECEIVE, "sx_rcv out\n"));
}
/*
* sx_receive_exception()
* Handle receive exception request interrupt processing.
*
* Description:
* Handle a receive exception request interrupt from the CD1865.
* Possible exceptions include BREAK, overrun, receiver timeout
* and parity and frame errors. We don't handle receiver timeout,
* we just complain. The rest are passed to ttyinput().
*/
static void
sx_receive_exception(
struct sx_softc *sc,
struct sx_port *pp,
int card)
{
struct tty *tp;
unsigned char st;
int ch, isopen;
tp = pp->sp_tty;
/*
* Let others know what we're doing.
*/
pp->sp_state |= SX_SS_IRCVEXC;
/*
* Check to see whether we should receive characters.
*/
if (tp->t_state & TS_CONNECTED &&
tp->t_state & TS_ISOPEN)
isopen = 1;
else
isopen = 0;
st = sx_cd1865_in(sc, CD1865_RCSR|SX_EI); /* Get the character status.*/
ch = (int)sx_cd1865_in(sc, CD1865_RDR|SX_EI); /* Get the character. */
DPRINT((pp, DBG_RECEIVE_EXC,
"sx_rexc %x st %x sp %x st 0x%x ch 0x%x ('%c')\n",
tp, tp->t_state, pp->sp_state, st, ch, ch));
/* If there's no status or the tty isn't open, bail. */
if (!st || !isopen) {
pp->sp_state &= ~SX_SS_IRCVEXC;
DPRINT((pp, DBG_RECEIVE_EXC, "sx_rexc not open\n"));
return;
}
if (st & CD1865_RCSR_TOUT) /* Receiver timeout; just complain. */
printf("sx%d: port %d: Receiver timeout.\n", card, pp->sp_chan);
else if (st & CD1865_RCSR_BREAK)
ch |= TTY_BI;
else if (st & CD1865_RCSR_PE)
ch |= TTY_PE;
else if (st & CD1865_RCSR_FE)
ch |= TTY_FE;
else if (st & CD1865_RCSR_OE)
ch |= TTY_OE;
ttyld_rint(tp, ch);
pp->sp_state &= ~SX_SS_IRCVEXC;
}
/*
* sx_intr()
* Field interrupts from the I/O8+.
*
* Description:
* The interrupt handler polls ALL ports on ALL adapters each time
* it is called.
*/
void
sx_intr(
void *arg)
{
struct sx_softc *sc;
struct sx_port *pp = NULL;
int card;
unsigned char ack;
sc = arg;
DPRINT((0, arg == NULL ? DBG_POLL:DBG_INTR, "sx_intr\n"));
if (in_interrupt)
return;
in_interrupt = 1;
/*
* When we get an int we poll all the channels and do ALL pending
* work, not just the first one we find. This allows all cards to
* share the same vector.
*
* On the other hand, if we're sharing the vector with something
* that's not an I/O8+, we may be making extra work for ourselves.
*/
for (card = 0; card < sx_numunits; card++) {
unsigned char st;
sc = devclass_get_softc(sx_devclass, card);
if (sc == NULL)
continue;
/*
* Check the Service Request Status Register to see who
* interrupted us and why. May be a receive, transmit or
* modem-signal-change interrupt. Reading the appropriate
* Request Acknowledge Register acknowledges the request and
* gives us the contents of the Global Service Vector Register,
* which in a daisy-chained configuration (not ours) uniquely
* identifies the particular CD1865 and gives us the request
* type. We mask off the ID part and use the rest.
*
* From the CD1865 specs, it appears that only one request can
* happen at a time, but in testing it's pretty obvious that
* the specs lie. Or perhaps we're just slow enough that the
* requests pile up. Regardless, if we try to process more
* than one at a time without clearing the previous request
* (writing zero to EOIR) first, we hang the card. Thus the
* "else if" logic here.
*/
while ((st = (sx_cd1865_in(sc, CD1865_SRSR|SX_EI)) &
CD1865_SRSR_REQint)) {
/*
* Transmit request interrupt.
*/
if (st & CD1865_SRSR_TREQint) {
ack = sx_cd1865_in(sc, CD1865_TRAR|SX_EI) &
CD1865_GIVR_ITMASK;
pp = sx_int_port(sc, card);
if (pp == NULL) /* Bad channel. */
goto skip;
pp->sp_state |= SX_SS_INTR; /* In interrupt. */
if (ack == CD1865_GIVR_IT_TX)
sx_transmit(sc, pp, card);
else
printf("sx%d: Bad transmit ack 0x%02x.\n",
card, ack);
}
/*
* Modem signal change request interrupt.
*/
else if (st & CD1865_SRSR_MREQint) {
ack = sx_cd1865_in(sc, CD1865_MRAR|SX_EI) &
CD1865_GIVR_ITMASK;
pp = sx_int_port(sc, card);
if (pp == NULL) /* Bad channel. */
goto skip;
pp->sp_state |= SX_SS_INTR; /* In interrupt. */
if (ack == CD1865_GIVR_IT_MODEM)
sx_modem_state(sc, pp, card);
else
printf("sx%d: Bad modem ack 0x%02x.\n",
card, ack);
}
/*
* Receive request interrupt.
*/
else if (st & CD1865_SRSR_RREQint) {
ack = sx_cd1865_in(sc, CD1865_RRAR|SX_EI) &
CD1865_GIVR_ITMASK;
pp = sx_int_port(sc, card);
if (pp == NULL) /* Bad channel. */
goto skip;
pp->sp_state |= SX_SS_INTR; /* In interrupt. */
if (ack == CD1865_GIVR_IT_RCV)
sx_receive(sc, pp, card);
else if (ack == CD1865_GIVR_IT_REXC)
sx_receive_exception(sc, pp, card);
else
printf("sx%d: Bad receive ack 0x%02x.\n",
card, ack);
}
/*
* None of the above; this is a "can't happen," but
* you never know...
*/
else {
printf("sx%d: Bad service request 0x%02x.\n",
card, st);
}
pp->sp_state &= ~SX_SS_INTR;
skip: sx_cd1865_out(sc, CD1865_EOIR|SX_EI, 0); /* EOI. */
} /* while (st & CD1865_SRSR_REQint) */
} /* for (card = 0; card < sx_numunits; card++) */
in_interrupt = 0;
DPRINT((0, arg == NULL ? DBG_POLL:DBG_INTR, "sx_intr out\n"));
}
/*
* sx_start()
* Handle transmit and state-change stuff.
*
* Description:
* This is part of the line discipline processing; at various points in
* the line discipline he calls ttstart() which calls the oproc routine,
* which is this function. We're called by the line discipline to start
* data transmission and to change signal states (for RTS flow control).
* We're also called by this driver to perform line-breaks and to actually
* do the data transmission.
* We can only fill the FIFO from interrupt since the card only makes it
* available to us during a service request such as TXRDY; this only
* happens at interrupt.
*
* All paths through this code call ttwwakeup().
*/
static void
sx_start(
struct tty *tp)
{
struct sx_softc *sc;
struct sx_port *pp;
struct clist *qp;
int s;
int count = CD1865_TFIFOSZ;
s = spltty();
pp = tp->t_sc;
qp = &tp->t_outq;
DPRINT((pp, DBG_ENTRY|DBG_START,
"sx_start %x st %x sp %x cc %d\n",
tp, tp->t_state, pp->sp_state, qp->c_cc));
/*
* If we're stopped, just wake up sleepers and get out.
*/
if (tp->t_state & (TS_TIMEOUT|TS_TTSTOP)) {
ttwwakeup(tp);
splx(s);
DPRINT((pp, DBG_EXIT|DBG_START, "sx_start out\n", tp->t_state));
return;
}
sc = pp->sp_sc;
/*
* If we're not transmitting, we may have been called to crank up the
* transmitter and start things rolling or we may have been called to
* get a bit of tty state. If the latter, handle it. Either way, if
* we have data to transmit, turn on the transmit-ready interrupt,
* set the XMIT flag and we're done. As soon as we allow interrupts
* the card will interrupt for the first chunk of data. Note that
* we don't mark the tty as busy until we are actually sending data
* and then only if we have more than will fill the FIFO. If there's
* no data to transmit, just handle the tty state.
*/
if (!SX_XMITTING(pp)) {
/*
* If we were flow-controlled and input is no longer blocked,
* raise RTS if we can.
*/
if (SX_ISTOP(pp) && !(tp->t_state & TS_TBLOCK)) {
if (!SX_DTRPIN(pp) && SX_IFLOW(pp))
(void)sx_modem(tp, SER_RTS, 0);
pp->sp_state &= ~SX_SS_ISTOP;
}
/*
* If input is blocked, drop RTS if we can and set our flag.
*/
if (tp->t_state & TS_TBLOCK) {
if (!SX_DTRPIN(pp) && SX_IFLOW(pp))
(void)sx_modem(tp, 0, SER_RTS);
pp->sp_state |= SX_SS_ISTOP;
}
if ((qp->c_cc > 0 && !SX_OSTOP(pp)) || SX_DOBRK(pp)) {
disable_intr();
sx_cd1865_out(sc, CD1865_CAR|SX_EI, pp->sp_chan);
sx_cd1865_bis(sc, CD1865_IER|SX_EI, CD1865_IER_TXRDY);
enable_intr();
pp->sp_state |= SX_SS_XMIT;
}
ttwwakeup(tp);
splx(s);
DPRINT((pp, DBG_EXIT|DBG_START,
"sx_start out B st %x sp %x cc %d\n",
tp->t_state, pp->sp_state, qp->c_cc));
return;
}
/*
* If we weren't called from an interrupt or it wasn't a transmit
* interrupt, we've done all we need to do. Everything else is done
* in the transmit interrupt.
*/
if (!SX_INTR(pp) || !SX_IXMIT(pp)) {
ttwwakeup(tp);
splx(s);
DPRINT((pp, DBG_EXIT|DBG_START, "sx_start out X\n"));
return;
}
/*
* We're transmitting. If the clist is empty and we don't have a break
* to send, turn off transmit-ready interrupts, and clear the XMIT
* flag. Mark the tty as no longer busy, in case we haven't done
* that yet. A future call to sxwrite() with more characters will
* start up the process once more.
*/
if (qp->c_cc == 0 && !SX_DOBRK(pp)) {
disable_intr();
/* sx_cd1865_out(sc, CD1865_CAR|SX_EI, pp->sp_chan);*/
sx_cd1865_bic(sc, CD1865_IER|SX_EI, CD1865_IER_TXRDY);
enable_intr();
pp->sp_state &= ~SX_SS_XMIT;
tp->t_state &= ~TS_BUSY;
ttwwakeup(tp);
splx(s);
DPRINT((pp, DBG_EXIT|DBG_START,
"sx_start out E st %x sp %x\n",
tp->t_state, pp->sp_state));
return;
}
disable_intr();
/*
* If we have a BREAK state-change pending, handle it. If we aren't
* sending a break, start one. If we are, turn it off.
*/
if (SX_DOBRK(pp)) {
count -= 2; /* Account for escape chars in FIFO. */
if (SX_BREAK(pp)) { /* Doing break, stop it. */
sx_cd1865_out(sc, CD1865_TDR, CD1865_C_ESC);
sx_cd1865_out(sc, CD1865_TDR, CD1865_C_EBRK);
sx_cd1865_etcmode(sc, SX_EI, pp->sp_chan, 0);
pp->sp_state &= ~SX_SS_BREAK;
}
else { /* Start doing break. */
sx_cd1865_etcmode(sc, SX_EI, pp->sp_chan, 1);
sx_cd1865_out(sc, CD1865_TDR, CD1865_C_ESC);
sx_cd1865_out(sc, CD1865_TDR, CD1865_C_SBRK);
pp->sp_state |= SX_SS_BREAK;
}
pp->sp_state &= ~SX_SS_DOBRK;
}
/*
* We've still got data in the clist, fill the channel's FIFO. The
* CD1865 only gives us access to the FIFO during a transmit ready
* request [interrupt] for this channel.
*/
while (qp->c_cc > 0 && count-- >= 0) {
register unsigned char ch, *cp;
int nch;
ch = (char)getc(qp);
/*
* If we're doing a break we're in ETC mode, so we need to
* double any NULs in the stream.
*/
if (SX_BREAK(pp)) { /* Doing break, in ETC mode. */
if (ch == '\0') { /* NUL? Double it. */
sx_cd1865_out(sc, CD1865_TDR, ch);
count--;
}
/*
* Peek the next character; if it's a NUL, we need
* to escape it, but we can't if we're out of FIFO.
* We'll do it on the next pass and leave the FIFO
* incompletely filled.
*/
if (qp->c_cc > 0) {
cp = qp->c_cf;
cp = nextc(qp, cp, &nch);
if (nch == '\0' && count < 1)
count = -1;
}
}
sx_cd1865_out(sc, CD1865_TDR, ch);
}
enable_intr();
/*
* If we still have data to transmit, mark the tty busy for the
* line discipline.
*/
if (qp->c_cc > 0)
tp->t_state |= TS_BUSY;
else
tp->t_state &= ~TS_BUSY;
/* Wake up sleepers if necessary. */
ttwwakeup(tp);
splx(s);
DPRINT((pp, DBG_EXIT|DBG_START,
"sx_start out R %d/%d\n",
count, qp->c_cc));
}
/*
* Stop output on a line. called at spltty();
*/
void
sx_stop(
struct tty *tp,
int rw)
{
struct sx_softc *sc;
struct sx_port *pp;
int s;
pp = tp->t_sc;
sc = pp->sp_sc;
DPRINT((pp, DBG_ENTRY|DBG_STOP, "sx_stop(%x,%x)\n", tp, rw));
s = spltty();
/* XXX: must check (rw & FWRITE | FREAD) etc flushing... */
if (rw & FWRITE) {
disable_intr();
sx_cd1865_out(sc, CD1865_CAR|SX_EI, pp->sp_chan);
sx_cd1865_bic(sc, CD1865_IER|SX_EI, CD1865_IER_TXRDY);
sx_cd1865_wait_CCR(sc, SX_EI); /* Wait for CCR to go idle. */
sx_cd1865_out(sc, CD1865_CCR|SX_EI, CD1865_CCR_TXDIS);
sx_cd1865_wait_CCR(sc, SX_EI);
enable_intr();
/* what level are we meant to be flushing anyway? */
if (tp->t_state & TS_BUSY) {
if ((tp->t_state & TS_TTSTOP) == 0)
tp->t_state |= TS_FLUSH;
tp->t_state &= ~TS_BUSY;
ttwwakeup(tp);
}
}
/*
* Nothing to do for FREAD.
*/
splx(s);
}
#ifdef SX_DEBUG
void
sx_dprintf(
struct sx_port *pp,
int flags,
const char *fmt, ...)
{
static char *logbuf = NULL;
static char *linebuf = NULL;
static char *logptr;
char *lbuf;
int n, m;
va_list ap;
if (logbuf == NULL) {
logbuf = (char *)malloc(1024*1024, M_DEVBUF, M_WAITOK);
linebuf = (char *)malloc(256, M_DEVBUF, M_WAITOK);
logptr = logbuf;
}
lbuf = linebuf;
n = 0;
if ((pp == NULL && (sx_debug&flags)) ||
(pp != NULL && ((pp->sp_debug&flags) || (sx_debug&flags)))) {
if (pp != NULL &&
pp->sp_tty != NULL) {
n = snprintf(linebuf, 256, "sx%d(%d): ",
(int)pp->sp_sc->sc_unit, (int)pp->sp_chan);
if (n > 256)
n = 256;
lbuf += n;
}
m = n;
va_start(ap, fmt);
n = vsnprintf(lbuf, 256 - m, fmt, ap);
va_end(ap);
if (n > 256 - m)
n = 256 - m;
n += m;
if (logptr + n + 1 > logbuf + (1024 * 1024)) {
bzero(logptr, logbuf + (1024 * 1024) - logptr);
logptr = logbuf;
}
bcopy(linebuf, logptr, n);
logptr += n;
*logptr = '\0';
if (sx_debug & DBG_PRINTF)
printf("%s", linebuf);
}
}
#endif /* DEBUG */
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