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par.c revision 1.11 
      1 /*	$NetBSD: par.c,v 1.11 1994/12/01 17:25:33 chopps Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1982, 1990 The Regents of the University of California.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  *
     35  *	@(#)ppi.c	7.3 (Berkeley) 12/16/90
     36  */
     37 
     38 /*
     39  * parallel port interface
     40  */
     41 
     42 #include "par.h"
     43 #if NPAR > 0
     44 
     45 #include <sys/param.h>
     46 #include <sys/errno.h>
     47 #include <sys/uio.h>
     48 #include <sys/device.h>
     49 #include <sys/malloc.h>
     50 #include <sys/file.h>
     51 #include <sys/systm.h>
     52 
     53 #include <amiga/amiga/device.h>
     54 #include <amiga/amiga/cia.h>
     55 #include <amiga/dev/parioctl.h>
     56 
     57 
     58 struct	par_softc {
     59 	int	sc_flags;
     60 	struct	parparam sc_param;
     61 #define sc_burst sc_param.burst
     62 #define sc_timo  sc_param.timo
     63 #define sc_delay sc_param.delay
     64 } *par_softcp;
     65 
     66 #define getparsp(x)	(x > 0 ? NULL : par_softcp)
     67 
     68 /* sc_flags values */
     69 #define	PARF_ALIVE	0x01
     70 #define	PARF_OPEN	0x02
     71 #define PARF_UIO	0x04
     72 #define PARF_TIMO	0x08
     73 #define PARF_DELAY	0x10
     74 #define PARF_OREAD	0x40
     75 #define PARF_OWRITE	0x80
     76 
     77 #define UNIT(x)		minor(x)
     78 
     79 #ifdef DEBUG
     80 int	pardebug = 0;
     81 #define PDB_FOLLOW	0x01
     82 #define PDB_IO		0x02
     83 #define PDB_INTERRUPT   0x04
     84 #define PDB_NOCHECK	0x80
     85 #endif
     86 
     87 void partimo __P((void *));
     88 void parstart __P((void *));
     89 void parintr __P((void *));
     90 
     91 void parattach __P((struct device *, struct device *, void *));
     92 int parmatch __P((struct device *, struct cfdata *, void *));
     93 
     94 struct cfdriver parcd = {
     95 	NULL, "par", (cfmatch_t)parmatch, parattach, DV_DULL,
     96 	sizeof(struct device), NULL, 0 };
     97 
     98 /*ARGSUSED*/
     99 int
    100 parmatch(pdp, cfp, auxp)
    101 	struct device *pdp;
    102 	struct cfdata *cfp;
    103 	void *auxp;
    104 {
    105 	if (matchname((char *)auxp, "par") && cfp->cf_unit == 0)
    106 		return(1);
    107 	return(0);
    108 }
    109 
    110 void
    111 parattach(pdp, dp, auxp)
    112 	struct device *pdp, *dp;
    113 	void *auxp;
    114 {
    115 	par_softcp = (struct par_softc *)dp;
    116 
    117 #ifdef DEBUG
    118 	if ((pardebug & PDB_NOCHECK) == 0)
    119 #endif
    120 		par_softcp->sc_flags = PARF_ALIVE;
    121 	printf("\n");
    122 }
    123 
    124 paropen(dev, flags)
    125 	dev_t dev;
    126 {
    127 	int unit = UNIT(dev);
    128 	struct par_softc *sc = getparsp(unit);
    129 
    130 	if (unit >= NPAR || (sc->sc_flags & PARF_ALIVE) == 0)
    131 		return(ENXIO);
    132 #ifdef DEBUG
    133 	if (pardebug & PDB_FOLLOW) {
    134 		printf("paropen(%x, %x): flags %x, ",
    135 		    dev, flags, sc->sc_flags);
    136 		printf ("port = $%x\n", ((ciab.pra ^ CIAB_PRA_SEL)
    137 		    & (CIAB_PRA_SEL|CIAB_PRA_BUSY|CIAB_PRA_POUT)));
    138 	}
    139 #endif
    140 	if (sc->sc_flags & PARF_OPEN)
    141 		return(EBUSY);
    142 	/* can either read or write, but not both */
    143 	if ((flags & (FREAD|FWRITE)) == (FREAD|FWRITE))
    144 		return EINVAL;
    145 
    146 	sc->sc_flags |= PARF_OPEN;
    147 
    148 	if (flags & FREAD)
    149 		sc->sc_flags |= PARF_OREAD;
    150 	else
    151 		sc->sc_flags |= PARF_OWRITE;
    152 
    153 	sc->sc_burst = PAR_BURST;
    154 	sc->sc_timo = parmstohz(PAR_TIMO);
    155 	sc->sc_delay = parmstohz(PAR_DELAY);
    156 	/* enable interrupts for CIAA-FLG */
    157 	ciaa.icr = CIA_ICR_IR_SC | CIA_ICR_FLG;
    158 	return(0);
    159 }
    160 
    161 parclose(dev, flags)
    162      dev_t dev;
    163 {
    164   int unit = UNIT(dev);
    165   struct par_softc *sc = getparsp(unit);
    166 
    167 #ifdef DEBUG
    168   if (pardebug & PDB_FOLLOW)
    169     printf("parclose(%x, %x): flags %x\n",
    170 	   dev, flags, sc->sc_flags);
    171 #endif
    172   sc->sc_flags &= ~(PARF_OPEN|PARF_OREAD|PARF_OWRITE);
    173   /* don't allow interrupts for CIAA-FLG any longer */
    174   ciaa.icr = CIA_ICR_FLG;
    175   return(0);
    176 }
    177 
    178 void
    179 parstart(arg)
    180 	void *arg;
    181 {
    182 	struct par_softc *sc;
    183 	int unit;
    184 
    185 	unit = (int)arg;
    186 	sc = getparsp(unit);
    187 #ifdef DEBUG
    188 	if (pardebug & PDB_FOLLOW)
    189 		printf("parstart(%x)\n", unit);
    190 #endif
    191 	sc->sc_flags &= ~PARF_DELAY;
    192 	wakeup(sc);
    193 }
    194 
    195 void
    196 partimo(arg)
    197 	void *arg;
    198 {
    199 	struct par_softc *sc;
    200 	int unit;
    201 
    202 	unit = (int) arg;
    203 	sc = getparsp(unit);
    204 #ifdef DEBUG
    205 	if (pardebug & PDB_FOLLOW)
    206 		printf("partimo(%x)\n", unit);
    207 #endif
    208 	sc->sc_flags &= ~(PARF_UIO|PARF_TIMO);
    209 	wakeup(sc);
    210 }
    211 
    212 parread(dev, uio)
    213      dev_t dev;
    214      struct uio *uio;
    215 {
    216 
    217 #ifdef DEBUG
    218   if (pardebug & PDB_FOLLOW)
    219     printf("parread(%x, %x)\n", dev, uio);
    220 #endif
    221   return (parrw(dev, uio));
    222 }
    223 
    224 parwrite(dev, uio)
    225      dev_t dev;
    226      struct uio *uio;
    227 {
    228 
    229 #ifdef DEBUG
    230   if (pardebug & PDB_FOLLOW)
    231     printf("parwrite(%x, %x)\n", dev, uio);
    232 #endif
    233   return (parrw(dev, uio));
    234 }
    235 
    236 parrw(dev, uio)
    237      dev_t dev;
    238      register struct uio *uio;
    239 {
    240   int unit = UNIT(dev);
    241   register struct par_softc *sc = getparsp(unit);
    242   register int s, len, cnt;
    243   register char *cp;
    244   int error = 0, gotdata = 0;
    245   int buflen;
    246   char *buf;
    247 
    248   if (!!(sc->sc_flags & PARF_OREAD) ^ (uio->uio_rw == UIO_READ))
    249     return EINVAL;
    250 
    251   if (uio->uio_resid == 0)
    252     return(0);
    253 
    254 #ifdef DEBUG
    255   if (pardebug & (PDB_FOLLOW|PDB_IO))
    256     printf("parrw(%x, %x, %c): burst %d, timo %d, resid %x\n",
    257 	   dev, uio, uio->uio_rw == UIO_READ ? 'R' : 'W',
    258 	   sc->sc_burst, sc->sc_timo, uio->uio_resid);
    259 #endif
    260   buflen = min(sc->sc_burst, uio->uio_resid);
    261   buf = (char *)malloc(buflen, M_DEVBUF, M_WAITOK);
    262   sc->sc_flags |= PARF_UIO;
    263   if (sc->sc_timo > 0)
    264     {
    265       sc->sc_flags |= PARF_TIMO;
    266       timeout(partimo, (void *)unit, sc->sc_timo);
    267     }
    268   while (uio->uio_resid > 0)
    269     {
    270       len = min(buflen, uio->uio_resid);
    271       cp = buf;
    272       if (uio->uio_rw == UIO_WRITE)
    273 	{
    274 	  error = uiomove(cp, len, uio);
    275 	  if (error)
    276 	    break;
    277 	}
    278 again:
    279       s = splbio();
    280 #if 0
    281       if ((sc->sc_flags & PARF_UIO) && hpibreq(&sc->sc_dq) == 0)
    282 	sleep(sc, PRIBIO+1);
    283 #endif
    284       /*
    285        * Check if we timed out during sleep or uiomove
    286        */
    287       (void) splsoftclock();
    288       if ((sc->sc_flags & PARF_UIO) == 0)
    289 	{
    290 #ifdef DEBUG
    291 	  if (pardebug & PDB_IO)
    292 	    printf("parrw: uiomove/sleep timo, flags %x\n",
    293 		   sc->sc_flags);
    294 #endif
    295 	  if (sc->sc_flags & PARF_TIMO)
    296 	    {
    297 	      untimeout(partimo, (void *)unit);
    298 	      sc->sc_flags &= ~PARF_TIMO;
    299 	    }
    300 	  splx(s);
    301 	  break;
    302 	}
    303       splx(s);
    304       /*
    305        * Perform the operation
    306        */
    307       if (uio->uio_rw == UIO_WRITE)
    308 	cnt = parsend (cp, len);
    309       else
    310 	cnt = parreceive (cp, len);
    311 
    312       if (cnt < 0)
    313 	{
    314 	  error = -cnt;
    315 	  break;
    316 	}
    317 
    318       s = splbio();
    319 #if 0
    320       hpibfree(&sc->sc_dq);
    321 #endif
    322 #ifdef DEBUG
    323       if (pardebug & PDB_IO)
    324 	printf("parrw: %s(%x, %d) -> %d\n",
    325 	       uio->uio_rw == UIO_READ ? "recv" : "send", cp, len, cnt);
    326 #endif
    327       splx(s);
    328       if (uio->uio_rw == UIO_READ)
    329 	{
    330 	  if (cnt)
    331 	    {
    332 	      error = uiomove(cp, cnt, uio);
    333 	      if (error)
    334 		break;
    335 	      gotdata++;
    336 	    }
    337 	  /*
    338 	   * Didn't get anything this time, but did in the past.
    339 	   * Consider us done.
    340 	   */
    341 	  else if (gotdata)
    342 	    break;
    343 	}
    344       s = splsoftclock();
    345       /*
    346        * Operation timeout (or non-blocking), quit now.
    347        */
    348       if ((sc->sc_flags & PARF_UIO) == 0)
    349 	{
    350 #ifdef DEBUG
    351 	  if (pardebug & PDB_IO)
    352 	    printf("parrw: timeout/done\n");
    353 #endif
    354 	  splx(s);
    355 	  break;
    356 	}
    357       /*
    358        * Implement inter-read delay
    359        */
    360       if (sc->sc_delay > 0)
    361 	{
    362 	  sc->sc_flags |= PARF_DELAY;
    363 	  timeout(parstart, (void *)unit, sc->sc_delay);
    364 	  error = tsleep(sc, PCATCH|PZERO-1, "par-cdelay", 0);
    365 	  if (error)
    366 	    {
    367 	      splx(s);
    368 	      break;
    369 	    }
    370 	}
    371       splx(s);
    372       /*
    373        * Must not call uiomove again til we've used all data
    374        * that we already grabbed.
    375        */
    376       if (uio->uio_rw == UIO_WRITE && cnt != len)
    377 	{
    378 	  cp += cnt;
    379 	  len -= cnt;
    380 	  cnt = 0;
    381 	  goto again;
    382 	}
    383     }
    384   s = splsoftclock();
    385   if (sc->sc_flags & PARF_TIMO)
    386     {
    387       untimeout(partimo, (void *)unit);
    388       sc->sc_flags &= ~PARF_TIMO;
    389     }
    390   if (sc->sc_flags & PARF_DELAY)
    391     {
    392       untimeout(parstart, (void *)unit);
    393       sc->sc_flags &= ~PARF_DELAY;
    394     }
    395   splx(s);
    396   /*
    397    * Adjust for those chars that we uiomove'ed but never wrote
    398    */
    399   if (uio->uio_rw == UIO_WRITE && cnt != len)
    400     {
    401       uio->uio_resid += (len - cnt);
    402 #ifdef DEBUG
    403       if (pardebug & PDB_IO)
    404 	printf("parrw: short write, adjust by %d\n",
    405 	       len-cnt);
    406 #endif
    407     }
    408   free(buf, M_DEVBUF);
    409 #ifdef DEBUG
    410   if (pardebug & (PDB_FOLLOW|PDB_IO))
    411     printf("parrw: return %d, resid %d\n", error, uio->uio_resid);
    412 #endif
    413   return (error);
    414 }
    415 
    416 int
    417 parioctl(dev, cmd, data, flag, p)
    418 	dev_t dev;
    419 	u_long cmd;
    420 	caddr_t data;
    421 	int flag;
    422 	struct proc *p;
    423 {
    424   struct par_softc *sc = getparsp(UNIT(dev));
    425   struct parparam *pp, *upp;
    426   int error = 0;
    427 
    428   switch (cmd)
    429     {
    430     case PARIOCGPARAM:
    431       pp = &sc->sc_param;
    432       upp = (struct parparam *)data;
    433       upp->burst = pp->burst;
    434       upp->timo = parhztoms(pp->timo);
    435       upp->delay = parhztoms(pp->delay);
    436       break;
    437 
    438     case PARIOCSPARAM:
    439       pp = &sc->sc_param;
    440       upp = (struct parparam *)data;
    441       if (upp->burst < PAR_BURST_MIN || upp->burst > PAR_BURST_MAX ||
    442 	  upp->delay < PAR_DELAY_MIN || upp->delay > PAR_DELAY_MAX)
    443 	return(EINVAL);
    444       pp->burst = upp->burst;
    445       pp->timo = parmstohz(upp->timo);
    446       pp->delay = parmstohz(upp->delay);
    447       break;
    448 
    449     default:
    450       return(EINVAL);
    451     }
    452   return (error);
    453 }
    454 
    455 int
    456 parhztoms(h)
    457      int h;
    458 {
    459   extern int hz;
    460   register int m = h;
    461 
    462   if (m > 0)
    463     m = m * 1000 / hz;
    464   return(m);
    465 }
    466 
    467 int
    468 parmstohz(m)
    469      int m;
    470 {
    471   extern int hz;
    472   register int h = m;
    473 
    474   if (h > 0) {
    475     h = h * hz / 1000;
    476     if (h == 0)
    477       h = 1000 / hz;
    478   }
    479   return(h);
    480 }
    481 
    482 /* stuff below here if for interrupt driven output of data thru
    483    the parallel port. */
    484 
    485 int partimeout_pending;
    486 int parsend_pending;
    487 
    488 void
    489 parintr(arg)
    490 	void *arg;
    491 {
    492 	int s, mask;
    493 
    494 	mask = (int)arg;
    495 	s = splclock();
    496 
    497 #ifdef DEBUG
    498 	if (pardebug & PDB_INTERRUPT)
    499 		printf("parintr %s\n", mask ? "FLG" : "tout");
    500 #endif
    501 	/*
    502 	 * if invoked from timeout handler, mask will be 0,
    503 	 * if from interrupt, it will contain the cia-icr mask,
    504 	 * which is != 0
    505 	 */
    506 	if (mask) {
    507 		if (partimeout_pending)
    508 			untimeout(parintr, 0);
    509 		if (parsend_pending)
    510 			parsend_pending = 0;
    511 	}
    512 
    513 	/* either way, there won't be a timeout pending any longer */
    514 	partimeout_pending = 0;
    515 
    516 	wakeup(parintr);
    517 	splx(s);
    518 }
    519 
    520 int
    521 parsendch (ch)
    522      u_char ch;
    523 {
    524   int error = 0;
    525   int s;
    526 
    527   /* if either offline, busy or out of paper, wait for that
    528      condition to clear */
    529   s = splclock();
    530   while (!error
    531 	 && (parsend_pending
    532 	     || ((ciab.pra ^ CIAB_PRA_SEL)
    533 		 & (CIAB_PRA_SEL|CIAB_PRA_BUSY|CIAB_PRA_POUT))))
    534     {
    535       extern int hz;
    536 
    537 #ifdef DEBUG
    538       if (pardebug & PDB_INTERRUPT)
    539 	printf ("parsendch, port = $%x\n",
    540 		((ciab.pra ^ CIAB_PRA_SEL)
    541 		 & (CIAB_PRA_SEL|CIAB_PRA_BUSY|CIAB_PRA_POUT)));
    542 #endif
    543       /* wait a second, and try again */
    544       timeout(parintr, 0, hz);
    545       partimeout_pending = 1;
    546       /* this is essentially a flipflop to have us wait for the
    547 	 first character being transmitted when trying to transmit
    548 	 the second, etc. */
    549       parsend_pending = 0;
    550       /* it's quite important that a parallel putc can be
    551 	 interrupted, given the possibility to lock a printer
    552 	 in an offline condition.. */
    553       if (error = tsleep(parintr, PCATCH|PZERO-1, "parsendch", 0))
    554 	{
    555 #ifdef DEBUG
    556 	  if (pardebug & PDB_INTERRUPT)
    557 	    printf ("parsendch interrupted, error = %d\n", error);
    558 #endif
    559 	  if (partimeout_pending)
    560 	    untimeout(parintr, 0);
    561 
    562 	  partimeout_pending = 0;
    563 	}
    564     }
    565 
    566   if (! error)
    567     {
    568 #ifdef DEBUG
    569       if (pardebug & PDB_INTERRUPT)
    570 	printf ("#%d", ch);
    571 #endif
    572       ciaa.prb = ch;
    573       parsend_pending = 1;
    574     }
    575 
    576   splx (s);
    577 
    578   return error;
    579 }
    580 
    581 
    582 int
    583 parsend (buf, len)
    584      u_char *buf;
    585      int len;
    586 {
    587   int err, orig_len = len;
    588 
    589   /* make sure I/O lines are setup right for output */
    590 
    591   /* control lines set to input */
    592   ciab.ddra &= ~(CIAB_PRA_SEL|CIAB_PRA_POUT|CIAB_PRA_BUSY);
    593   /* data lines to output */
    594   ciaa.ddrb = 0xff;
    595 
    596   for (; len; len--, buf++)
    597     if (err = parsendch (*buf))
    598       return err < 0 ? -EINTR : -err;
    599 
    600   /* either all or nothing.. */
    601   return orig_len;
    602 }
    603 
    604 
    605 
    606 int
    607 parreceive (buf, len)
    608      u_char *buf;
    609      int len;
    610 {
    611   /* oh deary me, something's gotta be left to be implemented
    612      later... */
    613   return 0;
    614 }
    615 
    616 
    617 #endif
    618