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NetBSD/sys/arch/hp300/dev/dcm.c

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/* $NetBSD: dcm.c,v 1.26 1996/03/03 16:48:54 thorpej Exp $ */
/*
* Copyright (c) 1995, 1996 Jason R. Thorpe. All rights reserved.
* Copyright (c) 1988 University of Utah.
* Copyright (c) 1982, 1986, 1990, 1993
* 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 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 the University of
* California, Berkeley and its contributors.
* 4. 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 BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
*
* from Utah: $Hdr: dcm.c 1.29 92/01/21$
*
* @(#)dcm.c 8.4 (Berkeley) 1/12/94
*/
/*
* TODO:
* Timeouts
* Test console support.
*/
#include "dcm.h"
#if NDCM > 0
/*
* 98642/MUX
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/ioctl.h>
#include <sys/proc.h>
#include <sys/tty.h>
#include <sys/conf.h>
#include <sys/file.h>
#include <sys/uio.h>
#include <sys/kernel.h>
#include <sys/syslog.h>
#include <sys/time.h>
#include <machine/autoconf.h>
#include <machine/cpu.h>
#include <dev/cons.h>
#include <hp300/dev/device.h>
#include <hp300/dev/dcmreg.h>
#include <hp300/hp300/isr.h>
#ifndef DEFAULT_BAUD_RATE
#define DEFAULT_BAUD_RATE 9600
#endif
int dcmmatch(), dcmparam();
void dcmattach(), dcmstart();
struct driver dcmdriver = {
dcmmatch, dcmattach, "dcm",
};
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 baud, 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 */
};
/*
* Stuff for DCM console support. This could probably be done a little
* better.
*/
static struct dcmdevice *dcm_cn = NULL; /* pointer to hardware */
static int dcm_lastcnpri = CN_DEAD; /* XXX last priority */
static int dcmconsinit; /* has been initialized */
int dcmdefaultrate = DEFAULT_BAUD_RATE;
int dcmconbrdbusy = 0;
int dcmmajor;
#ifdef KGDB
/*
* Kernel GDB support
*/
#include <machine/remote-sl.h>
extern dev_t kgdb_dev;
extern int kgdb_rate;
extern int kgdb_debug_init;
#endif
/* #define DCMSTATS */
#ifdef DEBUG
int dcmdebug = 0x0;
#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 DCMSTATS
#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 */
};
#endif
#define DCMUNIT(x) minor(x)
#define DCMBOARD(x) (((x) >> 2) & 0x3f)
#define DCMPORT(x) ((x) & 3)
/*
* Conversion from "HP DCE" to almost-normal DCE: on the 638 8-port mux,
* the distribution panel uses "HP DCE" conventions. If requested via
* the device flags, we swap the inputs to something closer to normal DCE,
* allowing a straight-through cable to a DTE or a reversed cable
* to a DCE (reversing 2-3, 4-5, 8-20 and leaving 6 unconnected;
* this gets "DCD" on pin 20 and "CTS" on 4, but doesn't connect
* DSR or make RTS work, though). The following gives the full
* details of a cable from this mux panel to a modem:
*
* HP modem
* name pin pin name
* HP inputs:
* "Rx" 2 3 Tx
* CTS 4 5 CTS (only needed for CCTS_OFLOW)
* DCD 20 8 DCD
* "DSR" 9 6 DSR (unneeded)
* RI 22 22 RI (unneeded)
*
* HP outputs:
* "Tx" 3 2 Rx
* "DTR" 6 not connected
* "RTS" 8 20 DTR
* "SR" 23 4 RTS (often not needed)
*/
#define hp2dce_in(ibits) (iconv[(ibits) & 0xf])
static char iconv[16] = {
0, MI_DM, MI_CTS, MI_CTS|MI_DM,
MI_CD, MI_CD|MI_DM, MI_CD|MI_CTS, MI_CD|MI_CTS|MI_DM,
MI_RI, MI_RI|MI_DM, MI_RI|MI_CTS, MI_RI|MI_CTS|MI_DM,
MI_RI|MI_CD, MI_RI|MI_CD|MI_DM, MI_RI|MI_CD|MI_CTS,
MI_RI|MI_CD|MI_CTS|MI_DM
};
/*
* Note that 8-port boards appear as 2 4-port boards at consecutive
* select codes.
*/
#define NDCMPORT 4
struct dcm_softc {
struct hp_device *sc_hd; /* device info */
struct dcmdevice *sc_dcm; /* pointer to hardware */
struct tty *sc_tty[NDCMPORT]; /* our tty instances */
struct modemreg *sc_modem[NDCMPORT]; /* modem control */
char sc_mcndlast[NDCMPORT]; /* XXX last modem status for port */
short sc_softCAR; /* mask of ports with soft-carrier */
struct dcmischeme sc_scheme; /* interrupt scheme for board */
/*
* Mask of soft-carrier bits in config flags.
*/
#define DCM_SOFTCAR 0x0000000f
int sc_flags; /* misc. configuration info */
/*
* Bits for sc_flags
*/
#define DCM_ACTIVE 0x00000001 /* indicates board is alive */
#define DCM_ISCONSOLE 0x00000002 /* indicates board is console */
#define DCM_STDDCE 0x00000010 /* re-map DCE to standard */
#define DCM_FLAGMASK (DCM_STDDCE) /* mask of valid bits in config flags */
#ifdef DCMSTATS
struct dcmstats sc_stats; /* metrics gathering */
#endif
} dcm_softc[NDCM];
void dcminit __P((struct dcmdevice *, int, int));
int dcmintr __P((void *));
int
dcmmatch(hd)
register struct hp_device *hd;
{
struct dcm_softc *sc = &dcm_softc[hd->hp_unit];
struct dcmdevice *dcm;
int i, timo = 0;
int s, brd, mbits;
dcm = (struct dcmdevice *)hd->hp_addr;
if ((dcm->dcm_rsid & 0x1f) != DCMID)
return (0);
brd = hd->hp_unit;
sc->sc_hd = hd;
hd->hp_ipl = DCMIPL(dcm->dcm_ic);
/*
* 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 (hd->hp_args->hw_sc != conscode)
printf("dcm%d: self test failed: %x\n",
brd, dcm->dcm_stcon);
return (0);
}
dcm->dcm_ic = IC_ID;
splx(s);
return (1);
}
void
dcmattach(hd)
register struct hp_device *hd;
{
struct dcm_softc *sc = &dcm_softc[hd->hp_unit];
struct dcmdevice *dcm;
int i, timo = 0;
int s, brd, mbits;
dcm = sc->sc_dcm = (struct dcmdevice *)hd->hp_addr;
brd = hd->hp_unit;
if (hd->hp_args->hw_sc == conscode) {
sc->sc_flags |= DCM_ISCONSOLE;
/*
* We didn't know which unit this would be during
* the console probe, so we have to fixup cn_dev here.
* Note that we always assume port 1 on the board.
*/
cn_tab->cn_dev = makedev(dcmmajor, (brd << 2) | DCMCONSPORT);
}
/* Extract configuration info from flags. */
sc->sc_softCAR = (hd->hp_flags & DCM_SOFTCAR);
sc->sc_flags = (hd->hp_flags & DCM_FLAGMASK);
/* Mark our unit as configured. */
sc->sc_flags |= DCM_ACTIVE;
/* Establish the interrupt handler. */
isrlink(dcmintr, sc, hd->hp_ipl, ISRPRI_TTY);
if (dcmistype == DIS_TIMER)
dcmsetischeme(brd, DIS_RESET|DIS_TIMER);
else
dcmsetischeme(brd, DIS_RESET|DIS_PERCHAR);
/* load pointers to modem control */
sc->sc_modem[0] = &dcm->dcm_modem0;
sc->sc_modem[1] = &dcm->dcm_modem1;
sc->sc_modem[2] = &dcm->dcm_modem2;
sc->sc_modem[3] = &dcm->dcm_modem3;
/* set DCD (modem) and CTS (flow control) on all ports */
if (sc->sc_flags & DCM_STDDCE)
mbits = hp2dce_in(MI_CD|MI_CTS);
else
mbits = MI_CD|MI_CTS;
for (i = 0; i < NDCMPORT; i++)
sc->sc_modem[i]->mdmmsk = mbits;
dcm->dcm_ic = IC_IE; /* turn all interrupts on */
/*
* Need to reset baud rate, etc. of next print so reset dcmconsinit.
* Also make sure console is always "hardwired"
*/
if (sc->sc_flags & DCM_ISCONSOLE) {
dcmconsinit = 0;
sc->sc_softCAR |= (1 << DCMCONSPORT);
printf(": console on port %d\n", DCMCONSPORT);
} else
printf("\n");
#ifdef KGDB
if (major(kgdb_dev) == dcmmajor &&
DCMBOARD(DCMUNIT(kgdb_dev)) == brd) {
if (dcmconsole == DCMUNIT(kgdb_dev)) /* XXX fixme */
kgdb_dev = NODEV; /* can't debug over console port */
#ifndef KGDB_CHEAT
/*
* The following could potentially be replaced
* by the corresponding code in dcmcnprobe.
*/
else {
dcminit(dcm, DCMPORT(DCMUNIT(kgdb_dev)),
kgdb_rate);
if (kgdb_debug_init) {
printf("%s port %d: ", sc->sc_hd->hp_xname,
DCMPORT(DCMUNIT(kgdb_dev)));
kgdb_connect(1);
} else
printf("%s port %d: kgdb enabled\n",
sc->sc_hd->hp_xname,
DCMPORT(DCMUNIT(kgdb_dev)));
}
/* end could be replaced */
#endif
}
#endif
}
/* ARGSUSED */
int
dcmopen(dev, flag, mode, p)
dev_t dev;
int flag, mode;
struct proc *p;
{
struct dcm_softc *sc;
struct tty *tp;
int unit, brd, port;
int error = 0, mbits, s;
unit = DCMUNIT(dev);
brd = DCMBOARD(unit);
port = DCMPORT(unit);
if ((brd >= NDCM) || (port >= NDCMPORT))
return (ENXIO);
sc = &dcm_softc[brd];
if ((sc->sc_flags & DCM_ACTIVE) == 0)
return (ENXIO);
if (sc->sc_tty[port] == NULL)
tp = sc->sc_tty[port] = ttymalloc();
else
tp = sc->sc_tty[port];
tp->t_oproc = dcmstart;
tp->t_param = dcmparam;
tp->t_dev = dev;
if ((tp->t_state & TS_ISOPEN) == 0) {
/*
* Sanity clause: reset the card on first open.
* The card might be left in an inconsistent state
* if the card memory is read inadvertently.
*/
dcminit(sc->sc_dcm, port, dcmdefaultrate);
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;
s = spltty();
(void) dcmparam(tp, &tp->t_termios);
ttsetwater(tp);
} else if (tp->t_state & TS_XCLUDE && p->p_ucred->cr_uid != 0)
return (EBUSY);
else
s = spltty();
/* Set modem control state. */
mbits = MO_ON;
if (sc->sc_flags & DCM_STDDCE)
mbits |= MO_SR; /* pin 23, could be used as RTS */
(void) dcmmctl(dev, mbits, DMSET); /* enable port */
/* Set soft-carrier if so configured. */
if ((sc->sc_softCAR & (1 << port)) ||
(dcmmctl(dev, MO_OFF, DMGET) & MI_CD))
tp->t_state |= TS_CARR_ON;
#ifdef DEBUG
if (dcmdebug & DDB_MODEM)
printf("%s: dcmopen port %d softcarr %c\n",
sc->sc_hd->hp_xname, port,
(tp->t_state & TS_CARR_ON) ? '1' : '0');
#endif
/* Wait for carrier if necessary. */
if ((flag & O_NONBLOCK) == 0)
while ((tp->t_cflag & CLOCAL) == 0 &&
(tp->t_state & TS_CARR_ON) == 0) {
tp->t_state |= TS_WOPEN;
error = ttysleep(tp, (caddr_t)&tp->t_rawq,
TTIPRI | PCATCH, ttopen, 0);
if (error) {
splx(s);
return (error);
}
}
splx(s);
#ifdef DEBUG
if (dcmdebug & DDB_OPENCLOSE)
printf("%s port %d: dcmopen: st %x fl %x\n",
sc->sc_hd->hp_xname, port, tp->t_state, tp->t_flags);
#endif
if (error == 0)
error = (*linesw[tp->t_line].l_open)(dev, tp);
return (error);
}
/*ARGSUSED*/
int
dcmclose(dev, flag, mode, p)
dev_t dev;
int flag, mode;
struct proc *p;
{
int s, unit, board, port;
struct dcm_softc *sc;
struct tty *tp;
unit = DCMUNIT(dev);
board = DCMBOARD(unit);
port = DCMPORT(unit);
sc = &dcm_softc[board];
tp = sc->sc_tty[port];
(*linesw[tp->t_line].l_close)(tp, flag);
s = spltty();
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("%s port %d: dcmclose: st %x fl %x\n",
sc->sc_hd->hp_xname, port, tp->t_state, tp->t_flags);
#endif
splx(s);
ttyclose(tp);
#if 0
ttyfree(tp);
sc->sc_tty[port] == NULL;
#endif
return (0);
}
int
dcmread(dev, uio, flag)
dev_t dev;
struct uio *uio;
int flag;
{
int unit, board, port;
struct dcm_softc *sc;
register struct tty *tp;
unit = DCMUNIT(dev);
board = DCMBOARD(unit);
port = DCMPORT(unit);
sc = &dcm_softc[board];
tp = sc->sc_tty[port];
return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
}
int
dcmwrite(dev, uio, flag)
dev_t dev;
struct uio *uio;
int flag;
{
int unit, board, port;
struct dcm_softc *sc;
register struct tty *tp;
unit = DCMUNIT(dev);
board = DCMBOARD(unit);
port = DCMPORT(unit);
sc = &dcm_softc[board];
tp = sc->sc_tty[port];
return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
}
struct tty *
dcmtty(dev)
dev_t dev;
{
int unit, board, port;
struct dcm_softc *sc;
unit = DCMUNIT(dev);
board = DCMBOARD(unit);
port = DCMPORT(unit);
sc = &dcm_softc[board];
return (sc->sc_tty[port]);
}
int
dcmintr(arg)
void *arg;
{
struct dcm_softc *sc = arg;
struct dcmdevice *dcm = sc->sc_dcm;
struct dcmischeme *dis = &sc->sc_scheme;
int brd = sc->sc_hd->hp_unit;
int code, i;
int pcnd[4], mcode, mcnd[4];
/*
* 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;
code = sc->sc_modem[i]->mdmin;
if (sc->sc_flags & DCM_STDDCE)
code = hp2dce_in(code);
mcnd[i] = code;
}
code = dcm->dcm_iir & IIR_MASK;
dcm->dcm_iir = 0; /* XXX doc claims read clears interrupt?! */
mcode = dcm->dcm_modemintr;
dcm->dcm_modemintr = 0;
SEM_UNLOCK(dcm);
#ifdef DEBUG
if (dcmdebug & DDB_INTR) {
printf("%s: dcmintr: iir %x pc %x/%x/%x/%x ",
sc->sc_hd->hp_xname, code, pcnd[0], pcnd[1],
pcnd[2], pcnd[3]);
printf("miir %x mc %x/%x/%x/%x\n",
mcode, mcnd[0], mcnd[1], mcnd[2], mcnd[3]);
}
#endif
if (code & IIR_TIMEO)
dcmrint(sc);
if (code & IIR_PORT0)
dcmpint(sc, 0, pcnd[0]);
if (code & IIR_PORT1)
dcmpint(sc, 1, pcnd[1]);
if (code & IIR_PORT2)
dcmpint(sc, 2, pcnd[2]);
if (code & IIR_PORT3)
dcmpint(sc, 3, pcnd[3]);
if (code & IIR_MODM) {
if (mcode == 0 || mcode & 0x1) /* mcode==0 -> 98642 board */
dcmmint(sc, 0, mcnd[0]);
if (mcode & 0x2)
dcmmint(sc, 1, mcnd[1]);
if (mcode & 0x4)
dcmmint(sc, 2, mcnd[2]);
if (mcode & 0x8)
dcmmint(sc, 3, mcnd[3]);
}
/*
* 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 &&
(i = 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 * i)
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(sc);
}
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(sc, port, code)
struct dcm_softc *sc;
int port, code;
{
if (code & IT_SPEC)
dcmreadbuf(sc, port);
if (code & IT_TX)
dcmxint(sc, port);
}
dcmrint(sc)
struct dcm_softc *sc;
{
int port;
for (port = 0; port < NDCMPORT; port++)
dcmreadbuf(sc, port);
}
dcmreadbuf(sc, port)
struct dcm_softc *sc;
int port;
{
struct dcmdevice *dcm = sc->sc_dcm;
struct tty *tp = sc->sc_tty[port];
struct dcmpreg *pp = dcm_preg(dcm, port);
struct dcmrfifo *fifo;
int c, stat;
u_int head;
int nch = 0;
#ifdef DCMSTATS
struct dcmstats *dsp = &sc->sc_stats;
dsp->rints++;
#endif
if ((tp->t_state & TS_ISOPEN) == 0) {
#ifdef KGDB
if ((makedev(dcmmajor, minor(tp->t_dev)) == kgdb_dev) &&
(head = pp->r_head & RX_MASK) != (pp->r_tail & RX_MASK) &&
dcm->dcm_rfifos[3-port][head>>1].data_char == FRAME_START) {
pp->r_head = (head + 2) & RX_MASK;
kgdb_connect(0); /* trap into kgdb */
return;
}
#endif /* KGDB */
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("%s port %d: dcmreadbuf: c%x('%c') s%x f%x h%x t%x\n",
sc->sc_hd->hp_xname, port,
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("%s port %d: dcmreadbuf: err: c%x('%c') s%x\n",
sc->sc_hd->hp_xname, port,
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,
"%s port %d: silo overflow\n",
sc->sc_hd->hp_xname, port);
else if (stat & RD_OE)
log(LOG_WARNING,
"%s port %d: uart overflow\n",
sc->sc_hd->hp_xname, port);
}
(*linesw[tp->t_line].l_rint)(c, tp);
}
sc->sc_scheme.dis_char += nch;
#ifdef DCMSTATS
dsp->rchars += nch;
if (nch <= DCMRBSIZE)
dsp->rsilo[nch]++;
else
dsp->rsilo[DCMRBSIZE+1]++;
#endif
}
dcmxint(sc, port)
struct dcm_softc *sc;
int port;
{
struct tty *tp = sc->sc_tty[port];
tp->t_state &= ~TS_BUSY;
if (tp->t_state & TS_FLUSH)
tp->t_state &= ~TS_FLUSH;
(*linesw[tp->t_line].l_start)(tp);
}
dcmmint(sc, port, mcnd)
struct dcm_softc *sc;
int port, mcnd;
{
int delta;
struct tty *tp;
struct dcmdevice *dcm = sc->sc_dcm;
tp = sc->sc_tty[port];
#ifdef DEBUG
if (dcmdebug & DDB_MODEM)
printf("%s port %d: dcmmint: mcnd %x mcndlast %x\n",
sc->sc_hd->hp_xname, port, mcnd, sc->sc_mcndlast[port]);
#endif
delta = mcnd ^ sc->sc_mcndlast[port];
sc->sc_mcndlast[port] = mcnd;
if ((delta & MI_CTS) && (tp->t_state & TS_ISOPEN) &&
(tp->t_flags & CCTS_OFLOW)) {
if (mcnd & MI_CTS) {
tp->t_state &= ~TS_TTSTOP;
ttstart(tp);
} else
tp->t_state |= TS_TTSTOP; /* inline dcmstop */
}
if (delta & MI_CD) {
if (mcnd & MI_CD)
(void)(*linesw[tp->t_line].l_modem)(tp, 1);
else if ((sc->sc_softCAR & (1 << port)) == 0 &&
(*linesw[tp->t_line].l_modem)(tp, 0) == 0) {
sc->sc_modem[port]->mdmout = MO_OFF;
SEM_LOCK(dcm);
dcm->dcm_modemchng |= (1 << port);
dcm->dcm_cr |= CR_MODM;
SEM_UNLOCK(dcm);
DELAY(10); /* time to change lines */
}
}
}
int
dcmioctl(dev, cmd, data, flag, p)
dev_t dev;
int cmd;
caddr_t data;
int flag;
struct proc *p;
{
struct dcm_softc *sc;
struct tty *tp;
struct dcmdevice *dcm;
int board, port, unit = DCMUNIT(dev);
int error, s;
port = DCMPORT(unit);
board = DCMBOARD(unit);
sc = &dcm_softc[board];
dcm = sc->sc_dcm;
tp = sc->sc_tty[port];
#ifdef DEBUG
if (dcmdebug & DDB_IOCTL)
printf("%s port %d: dcmioctl: cmd %x data %x flag %x\n",
sc->sc_hd->hp_xname, port, cmd, *data, flag);
#endif
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);
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;
case TIOCGFLAGS: {
int bits = 0;
if ((sc->sc_softCAR & (1 << port)))
bits |= TIOCFLAG_SOFTCAR;
if (tp->t_cflag & CLOCAL)
bits |= TIOCFLAG_CLOCAL;
*(int *)data = bits;
break;
}
case TIOCSFLAGS: {
int userbits;
error = suser(p->p_ucred, &p->p_acflag);
if (error)
return (EPERM);
userbits = *(int *)data;
if ((userbits & TIOCFLAG_SOFTCAR) ||
((sc->sc_flags & DCM_ISCONSOLE) &&
(port == DCMCONSPORT)))
sc->sc_softCAR |= (1 << port);
if (userbits & TIOCFLAG_CLOCAL)
tp->t_cflag |= CLOCAL;
break;
}
default:
return (ENOTTY);
}
return (0);
}
int
dcmparam(tp, t)
register struct tty *tp;
register struct termios *t;
{
struct dcm_softc *sc;
struct dcmdevice *dcm;
int unit, board, port, mode, cflag = t->c_cflag;
int ospeed = ttspeedtab(t->c_ospeed, dcmspeedtab);
unit = DCMUNIT(tp->t_dev);
board = DCMBOARD(unit);
port = DCMPORT(unit);
sc = &dcm_softc[board];
dcm = sc->sc_dcm;
/* 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(DCMUNIT(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("%s port %d: dcmparam: cflag %x mode %x speed %d uperch %d\n",
sc->sc_hd->hp_xname, port, cflag, mode, tp->t_ospeed,
DCM_USPERCH(tp->t_ospeed));
#endif
/*
* 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 baud.
* XXX why do we do this?
*/
DELAY(16 * DCM_USPERCH(tp->t_ospeed));
return (0);
}
void
dcmstart(tp)
register struct tty *tp;
{
struct dcm_softc *sc;
struct dcmdevice *dcm;
struct dcmpreg *pp;
struct dcmtfifo *fifo;
char *bp;
u_int head, tail, next;
int unit, board, port, nch;
char buf[16];
int s;
#ifdef DCMSTATS
struct dcmstats *dsp = &sc->sc_stats;
int tch = 0;
#endif
unit = DCMUNIT(tp->t_dev);
board = DCMBOARD(unit);
port = DCMPORT(unit);
sc = &dcm_softc[board];
dcm = sc->sc_dcm;
s = spltty();
#ifdef DCMSTATS
dsp->xints++;
#endif
#ifdef DEBUG
if (dcmdebug & DDB_OUTPUT)
printf("%s port %d: dcmstart: state %x flags %x outcc %d\n",
sc->sc_hd->hp_xname, port, 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);
}
selwakeup(&tp->t_wsel);
}
if (tp->t_outq.c_cc == 0) {
#ifdef DCMSTATS
dsp->xempty++;
#endif
goto out;
}
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 DCMSTATS
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 DCMSTATS
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("%s port %d: dcmstart(%d): head %x tail %x outqcc %d\n",
sc->sc_hd->hp_xname, port, head, tail, tp->t_outq.c_cc);
#endif
out:
#ifdef DCMSTATS
dsp->xchars += tch;
if (tch <= DCMXBSIZE)
dsp->xsilo[tch]++;
else
dsp->xsilo[DCMXBSIZE+1]++;
#endif
splx(s);
}
/*
* Stop output on a line.
*/
int
dcmstop(tp, flag)
register struct tty *tp;
int flag;
{
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;
{
struct dcm_softc *sc;
struct dcmdevice *dcm;
int s, unit, brd, port, hit = 0;
unit = DCMUNIT(dev);
brd = DCMBOARD(unit);
port = DCMPORT(unit);
sc = &dcm_softc[brd];
dcm = sc->sc_dcm;
#ifdef DEBUG
if (dcmdebug & DDB_MODEM)
printf("%s port %d: dcmmctl: bits 0x%x how %x\n",
sc->sc_hd->hp_xname, port, bits, how);
#endif
s = spltty();
switch (how) {
case DMSET:
sc->sc_modem[port]->mdmout = bits;
hit++;
break;
case DMBIS:
sc->sc_modem[port]->mdmout |= bits;
hit++;
break;
case DMBIC:
sc->sc_modem[port]->mdmout &= ~bits;
hit++;
break;
case DMGET:
bits = sc->sc_modem[port]->mdmin;
if (sc->sc_flags & DCM_STDDCE)
bits = hp2dce_in(bits);
break;
}
if (hit) {
SEM_LOCK(dcm);
dcm->dcm_modemchng |= 1<<(unit & 3);
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;
{
struct dcm_softc *sc = &dcm_softc[brd];
struct dcmdevice *dcm = sc->sc_dcm;
struct dcmischeme *dis = &sc->sc_scheme;
int i;
u_char mask;
int perchar = flags & DIS_PERCHAR;
#ifdef DEBUG
if (dcmdebug & DDB_INTSCHM)
printf("%s: dcmsetischeme(%d): cur %d, ints %d, chars %d\n",
sc->sc_hd->hp_xname, perchar, dis->dis_perchar,
dis->dis_intr, dis->dis_char);
if ((flags & DIS_RESET) == 0 && perchar == dis->dis_perchar) {
printf("%s: dcmsetischeme: redundent request %d\n",
sc->sc_hd->hp_xname, 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;
int c;
for (i = 0; i < NDCMPORT; i++) {
tp = sc->sc_tty[i];
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);
}
void
dcminit(dcm, port, rate)
struct dcmdevice *dcm;
int port, rate;
{
int s, mode;
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 baud.
* XXX why do we do this?
*/
DELAY(16 * DCM_USPERCH(rate));
splx(s);
}
/*
* Following are all routines needed for DCM to act as console
*/
int
dcm_console_scan(scode, va, arg)
int scode;
caddr_t va;
void *arg;
{
struct dcmdevice *dcm = (struct dcmdevice *)va;
struct consdev *cp = arg;
u_char *dioiidev;
int force = 0, pri;
switch (dcm->dcm_rsid) {
case DCMID:
pri = CN_NORMAL;
break;
case DCMID|DCMCON:
pri = CN_REMOTE;
break;
default:
return (0);
}
#ifdef CONSCODE
/*
* Raise our priority, if appropriate.
*/
if (scode == CONSCODE) {
pri = CN_REMOTE;
force = conforced = 1;
}
#endif
/* Only raise priority. */
if (pri > cp->cn_pri)
cp->cn_pri = pri;
/*
* If our priority is higher than the currently-remembered
* console, stash our priority, for the benefit of dcmcninit().
*/
if (((cn_tab == NULL) || (cp->cn_pri > cn_tab->cn_pri)) || force) {
cn_tab = cp;
if (scode >= 132) {
dioiidev = (u_char *)va;
return ((dioiidev[0x101] + 1) * 0x100000);
}
return (DIOCSIZE);
}
return (0);
}
void
dcmcnprobe(cp)
struct consdev *cp;
{
/* locate the major number */
for (dcmmajor = 0; dcmmajor < nchrdev; dcmmajor++)
if (cdevsw[dcmmajor].d_open == dcmopen)
break;
/* initialize required fields */
cp->cn_dev = makedev(dcmmajor, 0); /* XXX */
cp->cn_pri = CN_DEAD;
/* Abort early if console already forced. */
if (conforced)
return;
console_scan(dcm_console_scan, cp);
#ifdef KGDB_CHEAT
/* XXX this needs to be fixed. */
/*
* This doesn't currently work, at least not with ite consoles;
* the console hasn't been initialized yet.
*/
if (major(kgdb_dev) == dcmmajor &&
DCMBOARD(DCMUNIT(kgdb_dev)) == DCMBOARD(unit)) {
dcminit(dcm_cn, DCMPORT(DCMUNIT(kgdb_dev)), kgdb_rate);
if (kgdb_debug_init) {
/*
* We assume that console is ready for us...
* this assumes that a dca or ite console
* has been selected already and will init
* on the first putc.
*/
printf("dcm%d: ", DCMUNIT(kgdb_dev));
kgdb_connect(1);
}
}
#endif
}
/* ARGSUSED */
void
dcmcninit(cp)
struct consdev *cp;
{
dcm_cn = (struct dcmdevice *)conaddr;
dcminit(dcm_cn, DCMCONSPORT, dcmdefaultrate);
dcmconsinit = 1;
}
/* ARGSUSED */
int
dcmcngetc(dev)
dev_t dev;
{
struct dcmrfifo *fifo;
struct dcmpreg *pp;
u_int head;
int s, c, stat;
pp = dcm_preg(dcm_cn, DCMCONSPORT);
s = splhigh();
head = pp->r_head & RX_MASK;
fifo = &dcm_cn->dcm_rfifos[3-DCMCONSPORT][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_cn);
if ((dcm_cn->dcm_ic & IC_IE) == 0)
stat = dcm_cn->dcm_iir;
SEM_UNLOCK(dcm_cn);
c = fifo->data_char;
stat = fifo->data_stat;
pp->r_head = (head + 2) & RX_MASK;
splx(s);
return (c);
}
/*
* Console kernel output character routine.
*/
/* ARGSUSED */
void
dcmcnputc(dev, c)
dev_t dev;
int c;
{
struct dcmpreg *pp;
unsigned tail;
int s, unit, stat;
pp = dcm_preg(dcm_cn, DCMCONSPORT);
s = splhigh();
#ifdef KGDB
if (dev != kgdb_dev)
#endif
if (dcmconsinit == 0) {
dcminit(dcm_cn, DCMCONSPORT, dcmdefaultrate);
dcmconsinit = 1;
}
tail = pp->t_tail & TX_MASK;
while (tail != (pp->t_head & TX_MASK))
;
dcm_cn->dcm_tfifos[3-DCMCONSPORT][tail].data_char = c;
pp->t_tail = tail = (tail + 1) & TX_MASK;
SEM_LOCK(dcm_cn);
dcm_cn->dcm_cmdtab[DCMCONSPORT].dcm_data |= CT_TX;
dcm_cn->dcm_cr |= (1 << DCMCONSPORT);
SEM_UNLOCK(dcm_cn);
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_cn->dcm_ic & IC_IE) == 0) {
SEM_LOCK(dcm_cn);
stat = dcm_cn->dcm_iir;
SEM_UNLOCK(dcm_cn);
}
splx(s);
}
#endif /* NDCM > 0 */
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