/*-
* Copyright (c) 1996, 1997 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
/*
* 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. 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
*/
/* 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
static int dcmistype = -1; /* -1 == dynamic, 0 == timer, 1 == perchar */
static 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 */
};
#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
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
/*
* 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 const 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
/*
* Stuff for DCM console support. This could probably be done a little
* better.
*/
static struct dcmdevice *dcm_cn = NULL; /* pointer to hardware */
static int dcmconsinit; /* has been initialized */
#if 0
static int dcm_lastcnpri = CN_DEAD; /* XXX last priority */
#endif
/*
* 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(cdevsw_lookup_major(&dcm_cdevsw),
(brd << 2) | DCMCONSPORT);
} else {
sc->sc_bst = da->da_bst;
if (bus_space_map(sc->sc_bst, da->da_addr, da->da_size,
BUS_SPACE_MAP_LINEAR, &sc->sc_bsh)) {
aprint_error(": can't map registers\n");
return;
}
dcm = bus_space_vaddr(sc->sc_bst, sc->sc_bsh);
}
sc->sc_dcm = dcm;
/*
* XXX someone _should_ fix this; the self test screws
* autoconfig messages.
*/
if ((sc->sc_flags & DCM_ISCONSOLE) && dcmselftest(sc)) {
aprint_normal("\n");
aprint_error_dev(self, "self-test failed\n");
return;
}
/* Extract configuration info from flags. */
sc->sc_softCAR = device_cfdata(self)->cf_flags & DCM_SOFTCAR;
sc->sc_flags |= device_cfdata(self)->cf_flags & DCM_FLAGMASK;
/* Mark our unit as configured. */
sc->sc_flags |= DCM_ACTIVE;
/* Establish the interrupt handler. */
(void)dio_intr_establish(dcmintr, sc, da->da_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;
/*
* Get current state of mdmin register on all ports, so that
* deltas will work properly.
*/
for (i = 0; i < NDCMPORT; i++) {
code = sc->sc_modem[i]->mdmin;
if (sc->sc_flags & DCM_STDDCE)
code = hp2dce_in(code);
sc->sc_mcndlast[i] = code;
}
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);
aprint_normal(": console on port %d\n", DCMCONSPORT);
} else
aprint_normal("\n");
#ifdef KGDB
if (cdevsw_lookup(kgdb_dev) == &dcm_cdevsw &&
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) {
aprint_normal_dev(self, "port %d: ",
DCMPORT(DCMUNIT(kgdb_dev)));
kgdb_connect(1);
} else
aprint_normal_dev(self,
"port %d: kgdb enabled\n",
DCMPORT(DCMUNIT(kgdb_dev)));
}
/* end could be replaced */
#endif /* KGDB_CHEAT */
}
#endif /* KGDB */
}
static int
dcmopen(dev_t dev, int flag, int mode, struct lwp *l)
{
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);
sc = device_lookup_private(&dcm_cd, brd);
if (sc == NULL)
return ENXIO;
if ((sc->sc_flags & DCM_ACTIVE) == 0)
return ENXIO;
if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp))
return (EBUSY);
s = spltty();
if ((tp->t_state & TS_ISOPEN) == 0 && tp->t_wopen == 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);
static struct tty *
dcmtty(dev_t dev)
{
int unit, board, port;
struct dcm_softc *sc;
unit = DCMUNIT(dev);
board = DCMBOARD(unit);
port = DCMPORT(unit);
sc = device_lookup_private(&dcm_cd, board);
return sc->sc_tty[port];
}
static int
dcmintr(void *arg)
{
struct dcm_softc *sc = arg;
struct dcmdevice *dcm = sc->sc_dcm;
struct dcmischeme *dis = &sc->sc_scheme;
int brd = device_unit(sc->sc_dev);
int code, i;
int pcnd[4], mcode, mcnd[4];
/*
* Do all guarded 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 ",
device_xname(sc->sc_dev), 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_second - 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_second;
}
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);
*/
static void
dcmpint(struct dcm_softc *sc, int port, int code)
{
if (code & IT_SPEC)
dcmreadbuf(sc, port);
if (code & IT_TX)
dcmxint(sc, port);
}
static void
dcmrint(struct dcm_softc *sc)
{
int port;
for (port = 0; port < NDCMPORT; port++)
dcmreadbuf(sc, port);
}
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",
device_xname(sc->sc_dev), 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",
device_xname(sc->sc_dev), 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",
device_xname(sc->sc_dev), port);
else if (stat & RD_OE)
log(LOG_WARNING,
"%s port %d: uart overflow\n",
device_xname(sc->sc_dev), port);
}
(*tp->t_linesw->l_rint)(c, tp);
}
sc->sc_scheme.dis_char += nch;
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",
device_xname(sc->sc_dev), 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;
}
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",
device_xname(sc->sc_dev), 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 (!ttypull(tp)) {
#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: head %x tail %x outqcc %d\n",
device_xname(sc->sc_dev), 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.
*/
static void
dcmstop(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
*/
int
dcmmctl(dev_t dev, int bits, int how)
{
struct dcm_softc *sc;
struct dcmdevice *dcm;
int s, unit, brd, port, hit = 0;
unit = DCMUNIT(dev);
brd = DCMBOARD(unit);
port = DCMPORT(unit);
#ifdef DEBUG
if (dcmdebug & DDB_MODEM)
printf("%s port %d: dcmmctl: bits 0x%x how %x\n",
device_xname(sc->sc_dev), 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 */
splx(s);
}
return bits;
}
/*
* Set board to either interrupt per-character or at a fixed interval.
*/
static void
dcmsetischeme(int brd, int flags)
{
struct dcm_softc *sc = device_lookup_private(&dcm_cd, 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",
device_xname(sc->sc_dev), perchar, dis->dis_perchar,
dis->dis_intr, dis->dis_char);
if ((flags & DIS_RESET) == 0 && perchar == dis->dis_perchar) {
printf("%s: dcmsetischeme: redundant request %d\n",
device_xname(sc->sc_dev), 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) {
struct tty *tp;
int c;
for (i = 0; i < NDCMPORT; i++) {
tp = sc->sc_tty[i];
c = tty_getctrlchar(tp, VSTART);
if (c != _POSIX_VDISABLE)
dcm->dcm_bmap[c].data_data |= (1 << i);
c = tty_getctrlchar(tp, VSTOP);
if (c != _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);
}
static void
dcminit(struct dcmdevice *dcm, int port, int 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);
}
/*
* Empirically derived self-test magic
*/
static int
dcmselftest(struct dcm_softc *sc)
{
struct dcmdevice *dcm = sc->sc_dcm;
int timo = 0;
int s, rv;
rv = 1;
s = splhigh();
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)
goto out;
DELAY(1);
}
DELAY(50000); /* XXX why is this needed ???? */
while ((dcm->dcm_iir & IIR_SELFT) == 0) {
if (++timo == 400000)
goto out;
DELAY(1);
}
DELAY(50000); /* XXX why is this needed ???? */
if (dcm->dcm_stcon != ST_OK) {
#if 0
if (hd->hp_args->hw_sc != conscode)
aprint_error_dev(sc->sc_dev, "self test failed: %x\n",
dcm->dcm_stcon);
#endif
goto out;
}
dcm->dcm_ic = IC_ID;
rv = 0;
out:
splx(s);
return rv;
}
/*
* Following are all routines needed for DCM to act as console
*/
int
dcmcnattach(bus_space_tag_t bst, bus_addr_t addr, int scode)
{
bus_space_handle_t bsh;
void *va;
struct dcmdevice *dcm;
int maj;
if (bus_space_map(bst, addr, DIOCSIZE, 0, &bsh))
return 1;
va = bus_space_vaddr(bst, bsh);
dcm = (struct dcmdevice *)va;
switch (dcm->dcm_rsid) {
#ifdef CONSCODE
case DCMID:
#endif
case DCMID|DCMCON:
break;
default:
goto error;
}
#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) == maj &&
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
static int
dcmcngetc(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;
__USE(stat);
splx(s);
return c;
}
/*
* Console kernel output character routine.
*/
static void
dcmcnputc(dev_t dev, int c)
{
struct dcmpreg *pp;
unsigned tail;
int s, 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))
continue;
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))
continue;
/*
* 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);
}
__USE(stat);
splx(s);
}
