4.3BSD-Reno/src/sys/hpdev/dcm.c
/*
* Copyright (c) 1988 University of Utah.
* Copyright (c) 1982, 1986, 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department.
*
* Redistribution is only permitted until one year after the first shipment
* of 4.4BSD by the Regents. Otherwise, redistribution and use in source and
* binary forms are permitted provided that: (1) source distributions retain
* this entire copyright notice and comment, and (2) distributions including
* binaries display the following acknowledgement: This product includes
* software developed by the University of California, Berkeley and its
* contributors'' in the documentation or other materials provided with the
* distribution and in all advertising materials mentioning features or use
* of this software. Neither the name of the University nor the names of
* its contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* from: $Hdr: dcm.c 1.17 89/10/01$
*
* @(#)dcm.c 7.8 (Berkeley) 6/30/90
*/
/*
* TODO:
* Timeouts
* Test console/kgdb support.
*/
#include "dcm.h"
#if NDCM > 0
/*
* 98642/MUX
*/
#include "param.h"
#include "systm.h"
#include "ioctl.h"
#include "tty.h"
#include "user.h"
#include "conf.h"
#include "file.h"
#include "uio.h"
#include "kernel.h"
#include "syslog.h"
#include "time.h"
#include "device.h"
#include "dcmreg.h"
#include "machine/cpu.h"
#include "machine/isr.h"
#ifndef DEFAULT_BAUD_RATE
#define DEFAULT_BAUD_RATE 9600
#endif
int ttrstrt();
int dcmprobe(), dcmstart(), dcmintr(), dcmparam();
struct driver dcmdriver = {
dcmprobe, "dcm",
};
#define NDCMLINE (NDCM*4)
struct tty dcm_tty[NDCMLINE];
char mcndlast[NDCMLINE]; /* XXX last modem status for line */
int ndcm = NDCMLINE;
int dcm_active;
int dcmsoftCAR[NDCM];
struct dcmdevice *dcm_addr[NDCM];
struct isr dcmisr[NDCM];
struct speedtab dcmspeedtab[] = {
0, BR_0,
50, BR_50,
75, BR_75,
110, BR_110,
134, BR_134,
150, BR_150,
300, BR_300,
600, BR_600,
1200, BR_1200,
1800, BR_1800,
2400, BR_2400,
4800, BR_4800,
9600, BR_9600,
19200, BR_19200,
38400, BR_38400,
-1, -1
};
/* u-sec per character based on baudrate (assumes 1 start/8 data/1 stop bit) */
#define DCM_USPERCH(s) (10000000 / (s))
/*
* Per board interrupt scheme. 16.7ms is the polling interrupt rate
* (16.7ms is about 550 buad, 38.4k is 72 chars in 16.7ms).
*/
#define DIS_TIMER 0
#define DIS_PERCHAR 1
#define DIS_RESET 2
int dcmistype = -1; /* -1 == dynamic, 0 == timer, 1 == perchar */
int dcminterval = 5; /* interval (secs) between checks */
struct dcmischeme {
int dis_perchar; /* non-zero if interrupting per char */
long dis_time; /* last time examined */
int dis_intr; /* recv interrupts during last interval */
int dis_char; /* characters read during last interval */
} dcmischeme[NDCM];
/*
* Console support
*/
int dcmconsole = -1;
int dcmdefaultrate = DEFAULT_BAUD_RATE;
int dcmconbrdbusy = 0;
extern struct tty *constty;
#ifdef KGDB
/*
* Kernel GDB support
*/
extern int kgdb_dev;
extern int kgdb_rate;
extern int kgdb_debug_init;
#endif
/* #define IOSTATS */
#ifdef DEBUG
int dcmdebug = 0x00;
#define DDB_SIOERR 0x01
#define DDB_PARAM 0x02
#define DDB_INPUT 0x04
#define DDB_OUTPUT 0x08
#define DDB_INTR 0x10
#define DDB_IOCTL 0x20
#define DDB_INTSCHM 0x40
#define DDB_MODEM 0x80
#define DDB_OPENCLOSE 0x100
#endif
#ifdef IOSTATS
#define DCMRBSIZE 94
#define DCMXBSIZE 24
struct dcmstats {
long xints; /* # of xmit ints */
long xchars; /* # of xmit chars */
long xempty; /* times outq is empty in dcmstart */
long xrestarts; /* times completed while xmitting */
long rints; /* # of recv ints */
long rchars; /* # of recv chars */
long xsilo[DCMXBSIZE+2]; /* times this many chars xmit on one int */
long rsilo[DCMRBSIZE+2]; /* times this many chars read on one int */
} dcmstats[NDCM];
#endif
#define UNIT(x) minor(x)
#define BOARD(x) (((x) >> 2) & 0x3f)
#define PORT(x) ((x) & 3)
#define MKUNIT(b,p) (((b) << 2) | (p))
dcmprobe(hd)
register struct hp_device *hd;
{
register struct dcmdevice *dcm;
register int i;
register int timo = 0;
int s, brd, isconsole;
dcm = (struct dcmdevice *)hd->hp_addr;
if ((dcm->dcm_rsid & 0x1f) != DCMID)
return (0);
brd = hd->hp_unit;
isconsole = (brd == BOARD(dcmconsole));
/*
* XXX selected console device (CONSUNIT) as determined by
* dcmcnprobe does not agree with logical numbering imposed
* by the config file (i.e. lowest address DCM is not unit
* CONSUNIT). Don't recognize this card.
*/
if (isconsole && dcm != dcm_addr[BOARD(dcmconsole)])
return(0);
/*
* Empirically derived self-test magic
*/
s = spltty();
dcm->dcm_rsid = DCMRS;
DELAY(50000); /* 5000 is not long enough */
dcm->dcm_rsid = 0;
dcm->dcm_ic = IC_IE;
dcm->dcm_cr = CR_SELFT;
while ((dcm->dcm_ic & IC_IR) == 0)
if (++timo == 20000)
return(0);
DELAY(50000) /* XXX why is this needed ???? */
while ((dcm->dcm_iir & IIR_SELFT) == 0)
if (++timo == 400000)
return(0);
DELAY(50000) /* XXX why is this needed ???? */
if (dcm->dcm_stcon != ST_OK) {
if (!isconsole)
printf("dcm%d: self test failed: %x\n",
brd, dcm->dcm_stcon);
return(0);
}
dcm->dcm_ic = IC_ID;
splx(s);
hd->hp_ipl = DCMIPL(dcm->dcm_ic);
dcm_addr[brd] = dcm;
dcm_active |= 1 << brd;
dcmsoftCAR[brd] = hd->hp_flags;
dcmisr[brd].isr_ipl = hd->hp_ipl;
dcmisr[brd].isr_arg = brd;
dcmisr[brd].isr_intr = dcmintr;
isrlink(&dcmisr[brd]);
#ifdef KGDB
if (major(kgdb_dev) == 2 && BOARD(kgdb_dev) == brd) {
if (dcmconsole == UNIT(kgdb_dev))
kgdb_dev = -1; /* can't debug over console port */
else {
(void) dcminit(kgdb_dev, kgdb_rate);
if (kgdb_debug_init) {
printf("dcm%d: kgdb waiting...",
UNIT(kgdb_dev));
/* trap into kgdb */
asm("trap #15;");
printf("connected.\n");
} else
printf("dcm%d: kgdb enabled\n",
UNIT(kgdb_dev));
}
}
#endif
if (dcmistype == DIS_TIMER)
dcmsetischeme(brd, DIS_RESET|DIS_TIMER);
else
dcmsetischeme(brd, DIS_RESET|DIS_PERCHAR);
dcm->dcm_mdmmsk = MI_CD|MI_CTS; /* DCD (modem) and CTS (flow ctrl) */
dcm->dcm_ic = IC_IE; /* turn all interrupts on */
/*
* Need to reset baud rate, etc. of next print so reset dcmconsole.
* Also make sure console is always "hardwired"
*/
if (isconsole) {
dcmconsole = -1;
dcmsoftCAR[brd] |= (1 << PORT(dcmconsole));
}
return (1);
}
dcmopen(dev, flag)
dev_t dev;
{
register struct tty *tp;
register int unit, brd;
int error = 0;
unit = UNIT(dev);
brd = BOARD(unit);
if (unit >= NDCMLINE || (dcm_active & (1 << brd)) == 0)
return (ENXIO);
#ifdef KGDB
if (unit == UNIT(kgdb_dev))
return (EBUSY);
#endif
tp = &dcm_tty[unit];
tp->t_oproc = dcmstart;
tp->t_param = dcmparam;
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;
tp->t_lflag = TTYDEF_LFLAG;
tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
(void) dcmparam(tp, &tp->t_termios);
ttsetwater(tp);
} else if (tp->t_state&TS_XCLUDE && u.u_uid != 0)
return (EBUSY);
if (PORT(unit) == 0) /* enable port 0 */
(void) dcmmctl(dev, MO_ON, DMSET);
if (dcmsoftCAR[brd] & (1 << PORT(unit)))
tp->t_state |= TS_CARR_ON;
else if (PORT(unit)) /* Only port 0 has modem control */
tp->t_state |= TS_CARR_ON;
else if (dcmmctl(dev, MO_OFF, DMGET) & MI_CD)
tp->t_state |= TS_CARR_ON;
(void) spltty();
while ((flag&O_NONBLOCK) == 0 && (tp->t_cflag&CLOCAL) == 0 &&
(tp->t_state & TS_CARR_ON) == 0) {
tp->t_state |= TS_WOPEN;
if (error = ttysleep(tp, (caddr_t)&tp->t_rawq, TTIPRI | PCATCH,
ttopen, 0))
break;
}
(void) spl0();
#ifdef DEBUG
if (dcmdebug & DDB_OPENCLOSE)
printf("dcmopen: u %x st %x fl %x\n",
unit, tp->t_state, tp->t_flags);
#endif
if (error == 0)
error = (*linesw[tp->t_line].l_open)(dev, tp);
return (error);
}
/*ARGSUSED*/
dcmclose(dev, flag)
dev_t dev;
{
register struct tty *tp;
int unit;
unit = UNIT(dev);
tp = &dcm_tty[unit];
(*linesw[tp->t_line].l_close)(tp);
if (tp->t_cflag&HUPCL || tp->t_state&TS_WOPEN ||
(tp->t_state&TS_ISOPEN) == 0)
(void) dcmmctl(dev, MO_OFF, DMSET);
#ifdef DEBUG
if (dcmdebug & DDB_OPENCLOSE)
printf("dcmclose: u %x st %x fl %x\n",
unit, tp->t_state, tp->t_flags);
#endif
ttyclose(tp);
return(0);
}
dcmread(dev, uio, flag)
dev_t dev;
struct uio *uio;
{
register struct tty *tp;
tp = &dcm_tty[UNIT(dev)];
return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
}
dcmwrite(dev, uio, flag)
dev_t dev;
struct uio *uio;
{
int unit = UNIT(dev);
register struct tty *tp;
tp = &dcm_tty[unit];
/*
* XXX we disallow virtual consoles if the physical console is
* a serial port. This is in case there is a display attached that
* is not the console. In that situation we don't need/want the X
* server taking over the console.
*/
if (constty && unit == dcmconsole)
constty = NULL;
return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
}
dcmintr(brd)
register int brd;
{
register struct dcmdevice *dcm = dcm_addr[brd];
register struct dcmischeme *dis;
int i, code, pcnd[4], mcnd, delta;
/*
* Do all guarded register accesses right off to minimize
* block out of hardware.
*/
SEM_LOCK(dcm);
if ((dcm->dcm_ic & IC_IR) == 0) {
SEM_UNLOCK(dcm);
return(0);
}
for (i = 0; i < 4; i++) {
pcnd[i] = dcm->dcm_icrtab[i].dcm_data;
dcm->dcm_icrtab[i].dcm_data = 0;
}
mcnd = dcm->dcm_mdmin;
code = dcm->dcm_iir & IIR_MASK;
dcm->dcm_iir = 0; /* XXX doc claims read clears interrupt?! */
SEM_UNLOCK(dcm);
#ifdef DEBUG
if (dcmdebug & DDB_INTR)
printf("dcmintr(%d): iir %x p0 %x p1 %x p2 %x p3 %x m %x\n",
brd, code, pcnd[0], pcnd[1], pcnd[2], pcnd[3], mcnd);
#endif
if (code & IIR_TIMEO)
dcmrint(brd, dcm);
if (code & IIR_PORT0)
dcmpint(MKUNIT(brd, 0), pcnd[0], dcm);
if (code & IIR_PORT1)
dcmpint(MKUNIT(brd, 1), pcnd[1], dcm);
if (code & IIR_PORT2)
dcmpint(MKUNIT(brd, 2), pcnd[2], dcm);
if (code & IIR_PORT3)
dcmpint(MKUNIT(brd, 3), pcnd[3], dcm);
if (code & IIR_MODM)
dcmmint(MKUNIT(brd, 0), mcnd, dcm); /* XXX always port 0 */
dis = &dcmischeme[brd];
/*
* Chalk up a receiver interrupt if the timer running or one of
* the ports reports a special character interrupt.
*/
if ((code & IIR_TIMEO) ||
((pcnd[0]|pcnd[1]|pcnd[2]|pcnd[3]) & IT_SPEC))
dis->dis_intr++;
/*
* See if it is time to check/change the interrupt rate.
*/
if (dcmistype < 0 &&
(delta = time.tv_sec - dis->dis_time) >= dcminterval) {
/*
* If currently per-character and averaged over 70 interrupts
* per-second (66 is threshold of 600 baud) in last interval,
* switch to timer mode.
*
* XXX decay counts ala load average to avoid spikes?
*/
if (dis->dis_perchar && dis->dis_intr > 70 * delta)
dcmsetischeme(brd, DIS_TIMER);
/*
* If currently using timer and had more interrupts than
* received characters in the last interval, switch back
* to per-character. Note that after changing to per-char
* we must process any characters already in the queue
* since they may have arrived before the bitmap was setup.
*
* XXX decay counts?
*/
else if (!dis->dis_perchar && dis->dis_intr > dis->dis_char) {
dcmsetischeme(brd, DIS_PERCHAR);
dcmrint(brd, dcm);
}
dis->dis_intr = dis->dis_char = 0;
dis->dis_time = time.tv_sec;
}
return(1);
}
/*
* Port interrupt. Can be two things:
* First, it might be a special character (exception interrupt);
* Second, it may be a buffer empty (transmit interrupt);
*/
dcmpint(unit, code, dcm)
int unit, code;
struct dcmdevice *dcm;
{
struct tty *tp = &dcm_tty[unit];
if (code & IT_SPEC)
dcmreadbuf(unit, dcm, tp);
if (code & IT_TX)
dcmxint(unit, dcm, tp);
}
dcmrint(brd, dcm)
int brd;
register struct dcmdevice *dcm;
{
register int i, unit;
register struct tty *tp;
unit = MKUNIT(brd, 0);
tp = &dcm_tty[unit];
for (i = 0; i < 4; i++, tp++, unit++)
dcmreadbuf(unit, dcm, tp);
}
dcmreadbuf(unit, dcm, tp)
int unit;
register struct dcmdevice *dcm;
register struct tty *tp;
{
int port = PORT(unit);
register struct dcmpreg *pp = dcm_preg(dcm, port);
register struct dcmrfifo *fifo;
register int c, stat;
register unsigned head;
int nch = 0;
#ifdef IOSTATS
struct dcmstats *dsp = &dcmstats[BOARD(unit)];
dsp->rints++;
#endif
if ((tp->t_state & TS_ISOPEN) == 0) {
#ifdef KGDB
if (unit == UNIT(kgdb_dev) &&
(head = pp->r_head & RX_MASK) != (pp->r_tail & RX_MASK) &&
dcm->dcm_rfifos[3-port][head>>1].data_char == '!') {
pp->r_head = (head + 2) & RX_MASK;
printf("kgdb trap from dcm%d\n", unit);
/* trap into kgdb */
asm("trap #15;");
return;
}
#endif
pp->r_head = pp->r_tail & RX_MASK;
return;
}
head = pp->r_head & RX_MASK;
fifo = &dcm->dcm_rfifos[3-port][head>>1];
/*
* XXX upper bound on how many chars we will take in one swallow?
*/
while (head != (pp->r_tail & RX_MASK)) {
/*
* Get character/status and update head pointer as fast
* as possible to make room for more characters.
*/
c = fifo->data_char;
stat = fifo->data_stat;
head = (head + 2) & RX_MASK;
pp->r_head = head;
fifo = head ? fifo+1 : &dcm->dcm_rfifos[3-port][0];
nch++;
#ifdef DEBUG
if (dcmdebug & DDB_INPUT)
printf("dcmreadbuf(%d): c%x('%c') s%x f%x h%x t%x\n",
unit, c&0xFF, c, stat&0xFF,
tp->t_flags, head, pp->r_tail);
#endif
/*
* Check for and handle errors
*/
if (stat & RD_MASK) {
#ifdef DEBUG
if (dcmdebug & (DDB_INPUT|DDB_SIOERR))
printf("dcmreadbuf(%d): err: c%x('%c') s%x\n",
unit, stat, c&0xFF, c);
#endif
if (stat & (RD_BD | RD_FE))
c |= TTY_FE;
else if (stat & RD_PE)
c |= TTY_PE;
else if (stat & RD_OVF)
log(LOG_WARNING,
"dcm%d: silo overflow\n", unit);
else if (stat & RD_OE)
log(LOG_WARNING,
"dcm%d: uart overflow\n", unit);
}
(*linesw[tp->t_line].l_rint)(c, tp);
}
dcmischeme[BOARD(unit)].dis_char += nch;
#ifdef IOSTATS
dsp->rchars += nch;
if (nch <= DCMRBSIZE)
dsp->rsilo[nch]++;
else
dsp->rsilo[DCMRBSIZE+1]++;
#endif
}
dcmxint(unit, dcm, tp)
int unit;
struct dcmdevice *dcm;
register struct tty *tp;
{
tp->t_state &= ~TS_BUSY;
if (tp->t_state & TS_FLUSH)
tp->t_state &= ~TS_FLUSH;
if (tp->t_line)
(*linesw[tp->t_line].l_start)(tp);
else
dcmstart(tp);
}
dcmmint(unit, mcnd, dcm)
register int unit;
register struct dcmdevice *dcm;
int mcnd;
{
register struct tty *tp;
int delta;
#ifdef DEBUG
if (dcmdebug & DDB_MODEM)
printf("dcmmint: unit %x mcnd %x mcndlast\n",
unit, mcnd, mcndlast[unit]);
#endif
tp = &dcm_tty[unit];
delta = mcnd ^ mcndlast[unit];
mcndlast[unit] = mcnd;
if ((delta & MI_CD) &&
(dcmsoftCAR[BOARD(unit)] & (1 << PORT(unit))) == 0) {
if (mcnd & MI_CD)
(void)(*linesw[tp->t_line].l_modem)(tp, 1);
else if ((*linesw[tp->t_line].l_modem)(tp, 0) == 0) {
dcm->dcm_mdmout &= ~(MO_DTR|MO_RTS);
SEM_LOCK(dcm);
dcm->dcm_cr |= CR_MODM;
SEM_UNLOCK(dcm);
DELAY(10); /* time to change lines */
}
} else if ((delta & MI_CTS) &&
(tp->t_state & TS_ISOPEN) && (tp->t_flags & CRTSCTS)) {
if (mcnd & MI_CTS) {
tp->t_state &= ~TS_TTSTOP;
ttstart(tp);
} else
tp->t_state |= TS_TTSTOP; /* inline dcmstop */
}
}
dcmioctl(dev, cmd, data, flag)
dev_t dev;
caddr_t data;
{
register struct tty *tp;
register int unit = UNIT(dev);
register struct dcmdevice *dcm;
register int port;
int error, s;
#ifdef DEBUG
if (dcmdebug & DDB_IOCTL)
printf("dcmioctl: unit %d cmd %x data %x flag %x\n",
unit, cmd, *data, flag);
#endif
tp = &dcm_tty[unit];
error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag);
if (error >= 0)
return (error);
error = ttioctl(tp, cmd, data, flag);
if (error >= 0)
return (error);
port = PORT(unit);
dcm = dcm_addr[BOARD(unit)];
switch (cmd) {
case TIOCSBRK:
/*
* Wait for transmitter buffer to empty
*/
s = spltty();
while (dcm->dcm_thead[port].ptr != dcm->dcm_ttail[port].ptr)
DELAY(DCM_USPERCH(tp->t_ospeed));
SEM_LOCK(dcm);
dcm->dcm_cmdtab[port].dcm_data |= CT_BRK;
dcm->dcm_cr |= (1 << port); /* start break */
SEM_UNLOCK(dcm);
splx(s);
break;
case TIOCCBRK:
SEM_LOCK(dcm);
dcm->dcm_cmdtab[port].dcm_data |= CT_BRK;
dcm->dcm_cr |= (1 << port); /* end break */
SEM_UNLOCK(dcm);
break;
case TIOCSDTR:
(void) dcmmctl(dev, MO_ON, DMBIS);
break;
case TIOCCDTR:
(void) dcmmctl(dev, MO_ON, DMBIC);
break;
case TIOCMSET:
(void) dcmmctl(dev, *(int *)data, DMSET);
break;
case TIOCMBIS:
(void) dcmmctl(dev, *(int *)data, DMBIS);
break;
case TIOCMBIC:
(void) dcmmctl(dev, *(int *)data, DMBIC);
break;
case TIOCMGET:
*(int *)data = dcmmctl(dev, 0, DMGET);
break;
default:
return (ENOTTY);
}
return (0);
}
dcmparam(tp, t)
register struct tty *tp;
register struct termios *t;
{
register struct dcmdevice *dcm;
register int port, mode, cflag = t->c_cflag;
int ospeed = ttspeedtab(t->c_ospeed, dcmspeedtab);
/* check requested parameters */
if (ospeed < 0 || (t->c_ispeed && t->c_ispeed != t->c_ospeed))
return(EINVAL);
/* and copy to tty */
tp->t_ispeed = t->c_ispeed;
tp->t_ospeed = t->c_ospeed;
tp->t_cflag = cflag;
if (ospeed == 0) {
(void) dcmmctl(UNIT(tp->t_dev), MO_OFF, DMSET);
return(0);
}
mode = 0;
switch (cflag&CSIZE) {
case CS5:
mode = LC_5BITS; break;
case CS6:
mode = LC_6BITS; break;
case CS7:
mode = LC_7BITS; break;
case CS8:
mode = LC_8BITS; break;
}
if (cflag&PARENB) {
if (cflag&PARODD)
mode |= LC_PODD;
else
mode |= LC_PEVEN;
}
if (cflag&CSTOPB)
mode |= LC_2STOP;
else
mode |= LC_1STOP;
#ifdef DEBUG
if (dcmdebug & DDB_PARAM)
printf("dcmparam(%d): cflag %x mode %x speed %d uperch %d\n",
UNIT(tp->t_dev), cflag, mode, tp->t_ospeed,
DCM_USPERCH(tp->t_ospeed));
#endif
port = PORT(tp->t_dev);
dcm = dcm_addr[BOARD(tp->t_dev)];
/*
* Wait for transmitter buffer to empty.
*/
while (dcm->dcm_thead[port].ptr != dcm->dcm_ttail[port].ptr)
DELAY(DCM_USPERCH(tp->t_ospeed));
/*
* Make changes known to hardware.
*/
dcm->dcm_data[port].dcm_baud = ospeed;
dcm->dcm_data[port].dcm_conf = mode;
SEM_LOCK(dcm);
dcm->dcm_cmdtab[port].dcm_data |= CT_CON;
dcm->dcm_cr |= (1 << port);
SEM_UNLOCK(dcm);
/*
* Delay for config change to take place. Weighted by buad.
* XXX why do we do this?
*/
DELAY(16 * DCM_USPERCH(tp->t_ospeed));
return(0);
}
dcmstart(tp)
register struct tty *tp;
{
register struct dcmdevice *dcm;
register struct dcmpreg *pp;
register struct dcmtfifo *fifo;
register char *bp;
register unsigned tail, next;
register int port, nch;
unsigned head;
char buf[16];
int s;
#ifdef IOSTATS
struct dcmstats *dsp = &dcmstats[BOARD(tp->t_dev)];
int tch = 0;
#endif
s = spltty();
#ifdef IOSTATS
dsp->xints++;
#endif
#ifdef DEBUG
if (dcmdebug & DDB_OUTPUT)
printf("dcmstart(%d): state %x flags %x outcc %d\n",
UNIT(tp->t_dev), tp->t_state, tp->t_flags,
tp->t_outq.c_cc);
#endif
if (tp->t_state & (TS_TIMEOUT|TS_BUSY|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);
}
if (tp->t_wsel) {
selwakeup(tp->t_wsel, tp->t_state & TS_WCOLL);
tp->t_wsel = 0;
tp->t_state &= ~TS_WCOLL;
}
}
if (tp->t_outq.c_cc == 0) {
#ifdef IOSTATS
dsp->xempty++;
#endif
goto out;
}
dcm = dcm_addr[BOARD(tp->t_dev)];
port = PORT(tp->t_dev);
pp = dcm_preg(dcm, port);
tail = pp->t_tail & TX_MASK;
next = (tail + 1) & TX_MASK;
head = pp->t_head & TX_MASK;
if (head == next)
goto out;
fifo = &dcm->dcm_tfifos[3-port][tail];
again:
nch = q_to_b(&tp->t_outq, buf, (head - next) & TX_MASK);
#ifdef IOSTATS
tch += nch;
#endif
#ifdef DEBUG
if (dcmdebug & DDB_OUTPUT)
printf("\thead %x tail %x nch %d\n", head, tail, nch);
#endif
/*
* Loop transmitting all the characters we can.
*/
for (bp = buf; --nch >= 0; bp++) {
fifo->data_char = *bp;
pp->t_tail = next;
/*
* If this is the first character,
* get the hardware moving right now.
*/
if (bp == buf) {
tp->t_state |= TS_BUSY;
SEM_LOCK(dcm);
dcm->dcm_cmdtab[port].dcm_data |= CT_TX;
dcm->dcm_cr |= (1 << port);
SEM_UNLOCK(dcm);
}
tail = next;
fifo = tail ? fifo+1 : &dcm->dcm_tfifos[3-port][0];
next = (next + 1) & TX_MASK;
}
/*
* Head changed while we were loading the buffer,
* go back and load some more if we can.
*/
if (tp->t_outq.c_cc && head != (pp->t_head & TX_MASK)) {
#ifdef IOSTATS
dsp->xrestarts++;
#endif
head = pp->t_head & TX_MASK;
goto again;
}
/*
* Kick it one last time in case it finished while we were
* loading the last bunch.
*/
if (bp > &buf[1]) {
tp->t_state |= TS_BUSY;
SEM_LOCK(dcm);
dcm->dcm_cmdtab[port].dcm_data |= CT_TX;
dcm->dcm_cr |= (1 << port);
SEM_UNLOCK(dcm);
}
#ifdef DEBUG
if (dcmdebug & DDB_INTR)
printf("dcmstart(%d): head %x tail %x outqcc %d\n",
UNIT(tp->t_dev), head, tail, tp->t_outq.c_cc);
#endif
out:
#ifdef IOSTATS
dsp->xchars += tch;
if (tch <= DCMXBSIZE)
dsp->xsilo[tch]++;
else
dsp->xsilo[DCMXBSIZE+1]++;
#endif
splx(s);
}
/*
* Stop output on a line.
*/
dcmstop(tp, flag)
register struct tty *tp;
{
int s;
s = spltty();
if (tp->t_state & TS_BUSY) {
/* XXX is there some way to safely stop transmission? */
if ((tp->t_state&TS_TTSTOP) == 0)
tp->t_state |= TS_FLUSH;
}
splx(s);
}
/* Modem control */
dcmmctl(dev, bits, how)
dev_t dev;
int bits, how;
{
register struct dcmdevice *dcm;
int s, hit = 0;
/*
* Only port 0 has modem control lines.
* XXX ok for now but needs to changed for the 8 port board.
*/
if (PORT(UNIT(dev)) != 0)
return(bits);
dcm = dcm_addr[BOARD(UNIT(dev))];
s = spltty();
switch (how) {
case DMSET:
dcm->dcm_mdmout = bits;
hit++;
break;
case DMBIS:
dcm->dcm_mdmout |= bits;
hit++;
break;
case DMBIC:
dcm->dcm_mdmout &= ~bits;
hit++;
break;
case DMGET:
bits = dcm->dcm_mdmin;
break;
}
if (hit) {
SEM_LOCK(dcm);
dcm->dcm_cr |= CR_MODM;
SEM_UNLOCK(dcm);
DELAY(10); /* delay until done */
(void) splx(s);
}
return(bits);
}
/*
* Set board to either interrupt per-character or at a fixed interval.
*/
dcmsetischeme(brd, flags)
int brd, flags;
{
register struct dcmdevice *dcm = dcm_addr[brd];
register struct dcmischeme *dis = &dcmischeme[brd];
register int i;
u_char mask;
int perchar = flags & DIS_PERCHAR;
#ifdef DEBUG
if (dcmdebug & DDB_INTSCHM)
printf("dcmsetischeme(%d, %d): cur %d, ints %d, chars %d\n",
brd, perchar, dis->dis_perchar,
dis->dis_intr, dis->dis_char);
if ((flags & DIS_RESET) == 0 && perchar == dis->dis_perchar) {
printf("dcmsetischeme(%d): redundent request %d\n",
brd, perchar);
return;
}
#endif
/*
* If perchar is non-zero, we enable interrupts on all characters
* otherwise we disable perchar interrupts and use periodic
* polling interrupts.
*/
dis->dis_perchar = perchar;
mask = perchar ? 0xf : 0x0;
for (i = 0; i < 256; i++)
dcm->dcm_bmap[i].data_data = mask;
/*
* Don't slow down tandem mode, interrupt on flow control
* chars for any port on the board.
*/
if (!perchar) {
register struct tty *tp = &dcm_tty[MKUNIT(brd, 0)];
int c;
for (i = 0; i < 4; i++, tp++) {
if ((c = tp->t_cc[VSTART]) != _POSIX_VDISABLE)
dcm->dcm_bmap[c].data_data |= (1 << i);
if ((c = tp->t_cc[VSTOP]) != _POSIX_VDISABLE)
dcm->dcm_bmap[c].data_data |= (1 << i);
}
}
/*
* Board starts with timer disabled so if first call is to
* set perchar mode then we don't want to toggle the timer.
*/
if (flags == (DIS_RESET|DIS_PERCHAR))
return;
/*
* Toggle card 16.7ms interrupts (we first make sure that card
* has cleared the bit so it will see the toggle).
*/
while (dcm->dcm_cr & CR_TIMER)
;
SEM_LOCK(dcm);
dcm->dcm_cr |= CR_TIMER;
SEM_UNLOCK(dcm);
}
/*
* Following are all routines needed for DCM to act as console
*/
#include "machine/cons.h"
dcmcnprobe(cp)
struct consdev *cp;
{
register struct hp_hw *hw;
int unit, i;
extern int dcmopen();
/*
* Implicitly assigns the lowest select code DCM card found to be
* logical unit 0 (actually CONUNIT). If your config file does
* anything different, you're screwed.
*/
for (hw = sc_table; hw->hw_type; hw++)
if (hw->hw_type == COMMDCM && !badaddr((short *)hw->hw_addr))
break;
if (hw->hw_type != COMMDCM) {
cp->cn_pri = CN_DEAD;
return;
}
unit = CONUNIT;
dcm_addr[BOARD(CONUNIT)] = (struct dcmdevice *)hw->hw_addr;
/* locate the major number */
for (i = 0; i < nchrdev; i++)
if (cdevsw[i].d_open == dcmopen)
break;
/* initialize required fields */
cp->cn_dev = makedev(i, unit);
cp->cn_tp = &dcm_tty[unit];
switch (dcm_addr[BOARD(unit)]->dcm_rsid) {
case DCMID:
cp->cn_pri = CN_NORMAL;
break;
case DCMID|DCMCON:
cp->cn_pri = CN_REMOTE;
break;
default:
cp->cn_pri = CN_DEAD;
break;
}
}
dcmcninit(cp)
struct consdev *cp;
{
dcminit(cp->cn_dev, dcmdefaultrate);
dcmconsole = UNIT(cp->cn_dev);
}
dcminit(dev, rate)
dev_t dev;
int rate;
{
register struct dcmdevice *dcm = dcm_addr[BOARD(dev)];
int s, mode, port;
port = PORT(dev);
mode = LC_8BITS | LC_1STOP;
s = splhigh();
/*
* Wait for transmitter buffer to empty.
*/
while (dcm->dcm_thead[port].ptr != dcm->dcm_ttail[port].ptr)
DELAY(DCM_USPERCH(rate));
/*
* Make changes known to hardware.
*/
dcm->dcm_data[port].dcm_baud = ttspeedtab(rate, dcmspeedtab);
dcm->dcm_data[port].dcm_conf = mode;
SEM_LOCK(dcm);
dcm->dcm_cmdtab[port].dcm_data |= CT_CON;
dcm->dcm_cr |= (1 << port);
SEM_UNLOCK(dcm);
/*
* Delay for config change to take place. Weighted by buad.
* XXX why do we do this?
*/
DELAY(16 * DCM_USPERCH(rate));
splx(s);
}
dcmcngetc(dev)
dev_t dev;
{
register struct dcmdevice *dcm = dcm_addr[BOARD(dev)];
register struct dcmrfifo *fifo;
register struct dcmpreg *pp;
register unsigned head;
int s, c, stat, port;
port = PORT(dev);
pp = dcm_preg(dcm, port);
s = splhigh();
head = pp->r_head & RX_MASK;
fifo = &dcm->dcm_rfifos[3-port][head>>1];
while (head == (pp->r_tail & RX_MASK))
;
/*
* If board interrupts are enabled, just let our received char
* interrupt through in case some other port on the board was
* busy. Otherwise we must clear the interrupt.
*/
SEM_LOCK(dcm);
if ((dcm->dcm_ic & IC_IE) == 0)
stat = dcm->dcm_iir;
SEM_UNLOCK(dcm);
c = fifo->data_char;
stat = fifo->data_stat;
pp->r_head = (head + 2) & RX_MASK;
splx(s);
return(c);
}
/*
* Console kernel output character routine.
*/
dcmcnputc(dev, c)
dev_t dev;
int c;
{
register struct dcmdevice *dcm = dcm_addr[BOARD(dev)];
register struct dcmpreg *pp;
unsigned tail;
int s, port, stat;
port = PORT(dev);
pp = dcm_preg(dcm, port);
s = splhigh();
#ifdef KGDB
if (dev != kgdb_dev)
#endif
if (dcmconsole == -1) {
(void) dcminit(dev, dcmdefaultrate);
dcmconsole = UNIT(dev);
}
tail = pp->t_tail & TX_MASK;
while (tail != (pp->t_head & TX_MASK))
;
dcm->dcm_tfifos[3-port][tail].data_char = c;
pp->t_tail = tail = (tail + 1) & TX_MASK;
SEM_LOCK(dcm);
dcm->dcm_cmdtab[port].dcm_data |= CT_TX;
dcm->dcm_cr |= (1 << port);
SEM_UNLOCK(dcm);
while (tail != (pp->t_head & TX_MASK))
;
/*
* If board interrupts are enabled, just let our completion
* interrupt through in case some other port on the board
* was busy. Otherwise we must clear the interrupt.
*/
if ((dcm->dcm_ic & IC_IE) == 0) {
SEM_LOCK(dcm);
stat = dcm->dcm_iir;
SEM_UNLOCK(dcm);
}
splx(s);
}
#endif