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par.c revision 1.8 
      1 /*
      2  * Copyright (c) 1982, 1990 The Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  *
     33  *	from: @(#)ppi.c	7.3 (Berkeley) 12/16/90
     34  *	$Id: par.c,v 1.8 1994/05/31 03:11:44 chopps Exp $
     35  */
     36 
     37 /*
     38  * parallel port interface
     39  */
     40 
     41 #include "par.h"
     42 #if NPAR > 0
     43 
     44 #include <sys/param.h>
     45 #include <sys/errno.h>
     46 #include <sys/uio.h>
     47 #include <sys/device.h>
     48 #include <sys/malloc.h>
     49 #include <sys/file.h>
     50 #include <sys/systm.h>
     51 
     52 #include <amiga/amiga/device.h>
     53 #include <amiga/amiga/cia.h>
     54 #include <amiga/dev/parioctl.h>
     55 
     56 
     57 struct	par_softc {
     58 	int	sc_flags;
     59 	struct	parparam sc_param;
     60 #define sc_burst sc_param.burst
     61 #define sc_timo  sc_param.timo
     62 #define sc_delay sc_param.delay
     63 } *par_softcp;
     64 
     65 #define getparsp(x)	(x > 0 ? NULL : par_softcp)
     66 
     67 /* sc_flags values */
     68 #define	PARF_ALIVE	0x01
     69 #define	PARF_OPEN	0x02
     70 #define PARF_UIO	0x04
     71 #define PARF_TIMO	0x08
     72 #define PARF_DELAY	0x10
     73 #define PARF_OREAD	0x40
     74 #define PARF_OWRITE	0x80
     75 
     76 #define UNIT(x)		minor(x)
     77 
     78 #ifdef DEBUG
     79 int	pardebug = 0;
     80 #define PDB_FOLLOW	0x01
     81 #define PDB_IO		0x02
     82 #define PDB_INTERRUPT   0x04
     83 #define PDB_NOCHECK	0x80
     84 #endif
     85 
     86 void partimo __P((void *));
     87 void parstart __P((void *));
     88 void parintr __P((void *));
     89 
     90 void parattach __P((struct device *, struct device *, void *));
     91 int parmatch __P((struct device *, struct cfdata *, void *));
     92 
     93 struct cfdriver parcd = {
     94 	NULL, "par", parmatch, parattach, DV_DULL,
     95 	sizeof(struct device), NULL, 0 };
     96 
     97 /*ARGSUSED*/
     98 int
     99 parmatch(pdp, cfp, auxp)
    100 	struct device *pdp;
    101 	struct cfdata *cfp;
    102 	void *auxp;
    103 {
    104 	if (matchname((char *)auxp, "par") && cfp->cf_unit == 0)
    105 		return(1);
    106 	return(0);
    107 }
    108 
    109 void
    110 parattach(pdp, dp, auxp)
    111 	struct device *pdp, *dp;
    112 	void *auxp;
    113 {
    114 	par_softcp = (struct par_softc *)dp;
    115 
    116 #ifdef DEBUG
    117 	if ((pardebug & PDB_NOCHECK) == 0)
    118 #endif
    119 		par_softcp->sc_flags = PARF_ALIVE;
    120 	printf("\n");
    121 }
    122 
    123 paropen(dev, flags)
    124 	dev_t dev;
    125 {
    126 	int unit = UNIT(dev);
    127 	struct par_softc *sc = getparsp(unit);
    128 
    129 	if (unit >= NPAR || (sc->sc_flags & PARF_ALIVE) == 0)
    130 		return(ENXIO);
    131 #ifdef DEBUG
    132 	if (pardebug & PDB_FOLLOW) {
    133 		printf("paropen(%x, %x): flags %x, ",
    134 		    dev, flags, sc->sc_flags);
    135 		printf ("port = $%x\n", ((ciab.pra ^ CIAB_PRA_SEL)
    136 		    & (CIAB_PRA_SEL|CIAB_PRA_BUSY|CIAB_PRA_POUT)));
    137 	}
    138 #endif
    139 	if (sc->sc_flags & PARF_OPEN)
    140 		return(EBUSY);
    141 	/* can either read or write, but not both */
    142 	if ((flags & (FREAD|FWRITE)) == (FREAD|FWRITE))
    143 		return EINVAL;
    144 
    145 	sc->sc_flags |= PARF_OPEN;
    146 
    147 	if (flags & FREAD)
    148 		sc->sc_flags |= PARF_OREAD;
    149 	else
    150 		sc->sc_flags |= PARF_OWRITE;
    151 
    152 	sc->sc_burst = PAR_BURST;
    153 	sc->sc_timo = parmstohz(PAR_TIMO);
    154 	sc->sc_delay = parmstohz(PAR_DELAY);
    155 	/* enable interrupts for CIAA-FLG */
    156 	ciaa.icr = CIA_ICR_IR_SC | CIA_ICR_FLG;
    157 	return(0);
    158 }
    159 
    160 parclose(dev, flags)
    161      dev_t dev;
    162 {
    163   int unit = UNIT(dev);
    164   struct par_softc *sc = getparsp(unit);
    165 
    166 #ifdef DEBUG
    167   if (pardebug & PDB_FOLLOW)
    168     printf("parclose(%x, %x): flags %x\n",
    169 	   dev, flags, sc->sc_flags);
    170 #endif
    171   sc->sc_flags &= ~(PARF_OPEN|PARF_OREAD|PARF_OWRITE);
    172   /* don't allow interrupts for CIAA-FLG any longer */
    173   ciaa.icr = CIA_ICR_FLG;
    174   return(0);
    175 }
    176 
    177 void
    178 parstart(arg)
    179 	void *arg;
    180 {
    181 	struct par_softc *sc;
    182 	int unit;
    183 
    184 	unit = (int)arg;
    185 	sc = getparsp(unit);
    186 #ifdef DEBUG
    187 	if (pardebug & PDB_FOLLOW)
    188 		printf("parstart(%x)\n", unit);
    189 #endif
    190 	sc->sc_flags &= ~PARF_DELAY;
    191 	wakeup(sc);
    192 }
    193 
    194 void
    195 partimo(arg)
    196 	void *arg;
    197 {
    198 	struct par_softc *sc;
    199 	int unit;
    200 
    201 	unit = (int) arg;
    202 	sc = getparsp(unit);
    203 #ifdef DEBUG
    204 	if (pardebug & PDB_FOLLOW)
    205 		printf("partimo(%x)\n", unit);
    206 #endif
    207 	sc->sc_flags &= ~(PARF_UIO|PARF_TIMO);
    208 	wakeup(sc);
    209 }
    210 
    211 parread(dev, uio)
    212      dev_t dev;
    213      struct uio *uio;
    214 {
    215 
    216 #ifdef DEBUG
    217   if (pardebug & PDB_FOLLOW)
    218     printf("parread(%x, %x)\n", dev, uio);
    219 #endif
    220   return (parrw(dev, uio));
    221 }
    222 
    223 parwrite(dev, uio)
    224      dev_t dev;
    225      struct uio *uio;
    226 {
    227 
    228 #ifdef DEBUG
    229   if (pardebug & PDB_FOLLOW)
    230     printf("parwrite(%x, %x)\n", dev, uio);
    231 #endif
    232   return (parrw(dev, uio));
    233 }
    234 
    235 parrw(dev, uio)
    236      dev_t dev;
    237      register struct uio *uio;
    238 {
    239   int unit = UNIT(dev);
    240   register struct par_softc *sc = getparsp(unit);
    241   register int s, len, cnt;
    242   register char *cp;
    243   int error = 0, gotdata = 0;
    244   int buflen;
    245   char *buf;
    246 
    247   if (!!(sc->sc_flags & PARF_OREAD) ^ (uio->uio_rw == UIO_READ))
    248     return EINVAL;
    249 
    250   if (uio->uio_resid == 0)
    251     return(0);
    252 
    253 #ifdef DEBUG
    254   if (pardebug & (PDB_FOLLOW|PDB_IO))
    255     printf("parrw(%x, %x, %c): burst %d, timo %d, resid %x\n",
    256 	   dev, uio, uio->uio_rw == UIO_READ ? 'R' : 'W',
    257 	   sc->sc_burst, sc->sc_timo, uio->uio_resid);
    258 #endif
    259   buflen = min(sc->sc_burst, uio->uio_resid);
    260   buf = (char *)malloc(buflen, M_DEVBUF, M_WAITOK);
    261   sc->sc_flags |= PARF_UIO;
    262   if (sc->sc_timo > 0)
    263     {
    264       sc->sc_flags |= PARF_TIMO;
    265       timeout(partimo, (void *)unit, sc->sc_timo);
    266     }
    267   while (uio->uio_resid > 0)
    268     {
    269       len = min(buflen, uio->uio_resid);
    270       cp = buf;
    271       if (uio->uio_rw == UIO_WRITE)
    272 	{
    273 	  error = uiomove(cp, len, uio);
    274 	  if (error)
    275 	    break;
    276 	}
    277 again:
    278       s = splbio();
    279 #if 0
    280       if ((sc->sc_flags & PARF_UIO) && hpibreq(&sc->sc_dq) == 0)
    281 	sleep(sc, PRIBIO+1);
    282 #endif
    283       /*
    284        * Check if we timed out during sleep or uiomove
    285        */
    286       (void) splsoftclock();
    287       if ((sc->sc_flags & PARF_UIO) == 0)
    288 	{
    289 #ifdef DEBUG
    290 	  if (pardebug & PDB_IO)
    291 	    printf("parrw: uiomove/sleep timo, flags %x\n",
    292 		   sc->sc_flags);
    293 #endif
    294 	  if (sc->sc_flags & PARF_TIMO)
    295 	    {
    296 	      untimeout(partimo, (void *)unit);
    297 	      sc->sc_flags &= ~PARF_TIMO;
    298 	    }
    299 	  splx(s);
    300 	  break;
    301 	}
    302       splx(s);
    303       /*
    304        * Perform the operation
    305        */
    306       if (uio->uio_rw == UIO_WRITE)
    307 	cnt = parsend (cp, len);
    308       else
    309 	cnt = parreceive (cp, len);
    310 
    311       if (cnt < 0)
    312 	{
    313 	  error = -cnt;
    314 	  break;
    315 	}
    316 
    317       s = splbio();
    318 #if 0
    319       hpibfree(&sc->sc_dq);
    320 #endif
    321 #ifdef DEBUG
    322       if (pardebug & PDB_IO)
    323 	printf("parrw: %s(%x, %d) -> %d\n",
    324 	       uio->uio_rw == UIO_READ ? "recv" : "send", cp, len, cnt);
    325 #endif
    326       splx(s);
    327       if (uio->uio_rw == UIO_READ)
    328 	{
    329 	  if (cnt)
    330 	    {
    331 	      error = uiomove(cp, cnt, uio);
    332 	      if (error)
    333 		break;
    334 	      gotdata++;
    335 	    }
    336 	  /*
    337 	   * Didn't get anything this time, but did in the past.
    338 	   * Consider us done.
    339 	   */
    340 	  else if (gotdata)
    341 	    break;
    342 	}
    343       s = splsoftclock();
    344       /*
    345        * Operation timeout (or non-blocking), quit now.
    346        */
    347       if ((sc->sc_flags & PARF_UIO) == 0)
    348 	{
    349 #ifdef DEBUG
    350 	  if (pardebug & PDB_IO)
    351 	    printf("parrw: timeout/done\n");
    352 #endif
    353 	  splx(s);
    354 	  break;
    355 	}
    356       /*
    357        * Implement inter-read delay
    358        */
    359       if (sc->sc_delay > 0)
    360 	{
    361 	  sc->sc_flags |= PARF_DELAY;
    362 	  timeout(parstart, (void *)unit, sc->sc_delay);
    363 	  error = tsleep(sc, PCATCH|PZERO-1, "par-cdelay", 0);
    364 	  if (error)
    365 	    {
    366 	      splx(s);
    367 	      break;
    368 	    }
    369 	}
    370       splx(s);
    371       /*
    372        * Must not call uiomove again til we've used all data
    373        * that we already grabbed.
    374        */
    375       if (uio->uio_rw == UIO_WRITE && cnt != len)
    376 	{
    377 	  cp += cnt;
    378 	  len -= cnt;
    379 	  cnt = 0;
    380 	  goto again;
    381 	}
    382     }
    383   s = splsoftclock();
    384   if (sc->sc_flags & PARF_TIMO)
    385     {
    386       untimeout(partimo, (void *)unit);
    387       sc->sc_flags &= ~PARF_TIMO;
    388     }
    389   if (sc->sc_flags & PARF_DELAY)
    390     {
    391       untimeout(parstart, (void *)unit);
    392       sc->sc_flags &= ~PARF_DELAY;
    393     }
    394   splx(s);
    395   /*
    396    * Adjust for those chars that we uiomove'ed but never wrote
    397    */
    398   if (uio->uio_rw == UIO_WRITE && cnt != len)
    399     {
    400       uio->uio_resid += (len - cnt);
    401 #ifdef DEBUG
    402       if (pardebug & PDB_IO)
    403 	printf("parrw: short write, adjust by %d\n",
    404 	       len-cnt);
    405 #endif
    406     }
    407   free(buf, M_DEVBUF);
    408 #ifdef DEBUG
    409   if (pardebug & (PDB_FOLLOW|PDB_IO))
    410     printf("parrw: return %d, resid %d\n", error, uio->uio_resid);
    411 #endif
    412   return (error);
    413 }
    414 
    415 int
    416 parioctl(dev, cmd, data, flag, p)
    417 	dev_t dev;
    418 	int cmd;
    419 	caddr_t data;
    420 	int flag;
    421 	struct proc *p;
    422 {
    423   struct par_softc *sc = getparsp(UNIT(dev));
    424   struct parparam *pp, *upp;
    425   int error = 0;
    426 
    427   switch (cmd)
    428     {
    429     case PARIOCGPARAM:
    430       pp = &sc->sc_param;
    431       upp = (struct parparam *)data;
    432       upp->burst = pp->burst;
    433       upp->timo = parhztoms(pp->timo);
    434       upp->delay = parhztoms(pp->delay);
    435       break;
    436 
    437     case PARIOCSPARAM:
    438       pp = &sc->sc_param;
    439       upp = (struct parparam *)data;
    440       if (upp->burst < PAR_BURST_MIN || upp->burst > PAR_BURST_MAX ||
    441 	  upp->delay < PAR_DELAY_MIN || upp->delay > PAR_DELAY_MAX)
    442 	return(EINVAL);
    443       pp->burst = upp->burst;
    444       pp->timo = parmstohz(upp->timo);
    445       pp->delay = parmstohz(upp->delay);
    446       break;
    447 
    448     default:
    449       return(EINVAL);
    450     }
    451   return (error);
    452 }
    453 
    454 int
    455 parhztoms(h)
    456      int h;
    457 {
    458   extern int hz;
    459   register int m = h;
    460 
    461   if (m > 0)
    462     m = m * 1000 / hz;
    463   return(m);
    464 }
    465 
    466 int
    467 parmstohz(m)
    468      int m;
    469 {
    470   extern int hz;
    471   register int h = m;
    472 
    473   if (h > 0) {
    474     h = h * hz / 1000;
    475     if (h == 0)
    476       h = 1000 / hz;
    477   }
    478   return(h);
    479 }
    480 
    481 /* stuff below here if for interrupt driven output of data thru
    482    the parallel port. */
    483 
    484 int partimeout_pending;
    485 int parsend_pending;
    486 
    487 void
    488 parintr(arg)
    489 	void *arg;
    490 {
    491 	int s, mask;
    492 
    493 	mask = (int)arg;
    494 	s = splclock();
    495 
    496 #ifdef DEBUG
    497 	if (pardebug & PDB_INTERRUPT)
    498 		printf("parintr %s\n", mask ? "FLG" : "tout");
    499 #endif
    500 	/*
    501 	 * if invoked from timeout handler, mask will be 0,
    502 	 * if from interrupt, it will contain the cia-icr mask,
    503 	 * which is != 0
    504 	 */
    505 	if (mask) {
    506 		if (partimeout_pending)
    507 			untimeout(parintr, 0);
    508 		if (parsend_pending)
    509 			parsend_pending = 0;
    510 	}
    511 
    512 	/* either way, there won't be a timeout pending any longer */
    513 	partimeout_pending = 0;
    514 
    515 	wakeup(parintr);
    516 	splx(s);
    517 }
    518 
    519 int
    520 parsendch (ch)
    521      u_char ch;
    522 {
    523   int error = 0;
    524   int s;
    525 
    526   /* if either offline, busy or out of paper, wait for that
    527      condition to clear */
    528   s = splclock();
    529   while (!error
    530 	 && (parsend_pending
    531 	     || ((ciab.pra ^ CIAB_PRA_SEL)
    532 		 & (CIAB_PRA_SEL|CIAB_PRA_BUSY|CIAB_PRA_POUT))))
    533     {
    534       extern int hz;
    535 
    536 #ifdef DEBUG
    537       if (pardebug & PDB_INTERRUPT)
    538 	printf ("parsendch, port = $%x\n",
    539 		((ciab.pra ^ CIAB_PRA_SEL)
    540 		 & (CIAB_PRA_SEL|CIAB_PRA_BUSY|CIAB_PRA_POUT)));
    541 #endif
    542       /* wait a second, and try again */
    543       timeout(parintr, 0, hz);
    544       partimeout_pending = 1;
    545       /* this is essentially a flipflop to have us wait for the
    546 	 first character being transmitted when trying to transmit
    547 	 the second, etc. */
    548       parsend_pending = 0;
    549       /* it's quite important that a parallel putc can be
    550 	 interrupted, given the possibility to lock a printer
    551 	 in an offline condition.. */
    552       if (error = tsleep(parintr, PCATCH|PZERO-1, "parsendch", 0))
    553 	{
    554 #ifdef DEBUG
    555 	  if (pardebug & PDB_INTERRUPT)
    556 	    printf ("parsendch interrupted, error = %d\n", error);
    557 #endif
    558 	  if (partimeout_pending)
    559 	    untimeout(parintr, 0);
    560 
    561 	  partimeout_pending = 0;
    562 	}
    563     }
    564 
    565   if (! error)
    566     {
    567 #ifdef DEBUG
    568       if (pardebug & PDB_INTERRUPT)
    569 	printf ("#%d", ch);
    570 #endif
    571       ciaa.prb = ch;
    572       parsend_pending = 1;
    573     }
    574 
    575   splx (s);
    576 
    577   return error;
    578 }
    579 
    580 
    581 int
    582 parsend (buf, len)
    583      u_char *buf;
    584      int len;
    585 {
    586   int err, orig_len = len;
    587 
    588   /* make sure I/O lines are setup right for output */
    589 
    590   /* control lines set to input */
    591   ciab.ddra &= ~(CIAB_PRA_SEL|CIAB_PRA_POUT|CIAB_PRA_BUSY);
    592   /* data lines to output */
    593   ciaa.ddrb = 0xff;
    594 
    595   for (; len; len--, buf++)
    596     if (err = parsendch (*buf))
    597       return err < 0 ? -EINTR : -err;
    598 
    599   /* either all or nothing.. */
    600   return orig_len;
    601 }
    602 
    603 
    604 
    605 int
    606 parreceive (buf, len)
    607      u_char *buf;
    608      int len;
    609 {
    610   /* oh deary me, something's gotta be left to be implemented
    611      later... */
    612   return 0;
    613 }
    614 
    615 
    616 #endif
    617