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par.c revision 1.22 
      1 /*	$NetBSD: par.c,v 1.22 2000/04/23 19:55:51 mhitch 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 #include <sys/callout.h>
     53 #include <sys/proc.h>
     54 
     55 #include <amiga/amiga/device.h>
     56 #include <amiga/amiga/cia.h>
     57 #include <amiga/dev/parioctl.h>
     58 
     59 #include <sys/conf.h>
     60 #include <machine/conf.h>
     61 
     62 struct	par_softc {
     63 	struct device sc_dev;
     64 
     65 	int	sc_flags;
     66 	struct	parparam sc_param;
     67 #define sc_burst sc_param.burst
     68 #define sc_timo  sc_param.timo
     69 #define sc_delay sc_param.delay
     70 
     71 	struct callout sc_timo_ch;
     72 	struct callout sc_start_ch;
     73 } *par_softcp;
     74 
     75 #define getparsp(x)	(x > 0 ? NULL : par_softcp)
     76 
     77 struct callout parintr_ch = CALLOUT_INITIALIZER;
     78 
     79 /* sc_flags values */
     80 #define	PARF_ALIVE	0x01
     81 #define	PARF_OPEN	0x02
     82 #define PARF_UIO	0x04
     83 #define PARF_TIMO	0x08
     84 #define PARF_DELAY	0x10
     85 #define PARF_OREAD	0x40
     86 #define PARF_OWRITE	0x80
     87 
     88 #define UNIT(x)		minor(x)
     89 
     90 #ifdef DEBUG
     91 int	pardebug = 0;
     92 #define PDB_FOLLOW	0x01
     93 #define PDB_IO		0x02
     94 #define PDB_INTERRUPT   0x04
     95 #define PDB_NOCHECK	0x80
     96 #endif
     97 
     98 int parrw __P((dev_t, struct uio *));
     99 int parhztoms __P((int));
    100 int parmstohz __P((int));
    101 int parsend __P((u_char *, int));
    102 int parreceive __P((u_char *, int));
    103 int parsendch __P((u_char));
    104 
    105 void partimo __P((void *));
    106 void parstart __P((void *));
    107 void parintr __P((void *));
    108 
    109 void parattach __P((struct device *, struct device *, void *));
    110 int parmatch __P((struct device *, struct cfdata *, void *));
    111 
    112 struct cfattach par_ca = {
    113 	sizeof(struct par_softc), parmatch, parattach
    114 };
    115 
    116 /*ARGSUSED*/
    117 int
    118 parmatch(pdp, cfp, auxp)
    119 	struct device *pdp;
    120 	struct cfdata *cfp;
    121 	void *auxp;
    122 {
    123 	static int par_found = 0;
    124 
    125 	if (!matchname((char *)auxp, "par") || par_found)
    126 		return(0);
    127 
    128 	par_found = 1;
    129 	return(1);
    130 }
    131 
    132 void
    133 parattach(pdp, dp, auxp)
    134 	struct device *pdp, *dp;
    135 	void *auxp;
    136 {
    137 	par_softcp = (struct par_softc *)dp;
    138 
    139 #ifdef DEBUG
    140 	if ((pardebug & PDB_NOCHECK) == 0)
    141 #endif
    142 		par_softcp->sc_flags = PARF_ALIVE;
    143 	printf("\n");
    144 
    145 	callout_init(&par_softcp->sc_timo_ch);
    146 	callout_init(&par_softcp->sc_start_ch);
    147 }
    148 
    149 int
    150 paropen(dev, flags, mode, p)
    151 	dev_t dev;
    152 	int flags;
    153 	int mode;
    154 	struct proc *p;
    155 {
    156 	int unit = UNIT(dev);
    157 	struct par_softc *sc = getparsp(unit);
    158 
    159 	if (unit >= NPAR || (sc->sc_flags & PARF_ALIVE) == 0)
    160 		return(ENXIO);
    161 #ifdef DEBUG
    162 	if (pardebug & PDB_FOLLOW) {
    163 		printf("paropen(%x, %x): flags %x, ",
    164 		    dev, flags, sc->sc_flags);
    165 		printf ("port = $%x\n", ((ciab.pra ^ CIAB_PRA_SEL)
    166 		    & (CIAB_PRA_SEL|CIAB_PRA_BUSY|CIAB_PRA_POUT)));
    167 	}
    168 #endif
    169 	if (sc->sc_flags & PARF_OPEN)
    170 		return(EBUSY);
    171 	/* can either read or write, but not both */
    172 	if ((flags & (FREAD|FWRITE)) == (FREAD|FWRITE))
    173 		return EINVAL;
    174 
    175 	sc->sc_flags |= PARF_OPEN;
    176 
    177 	if (flags & FREAD)
    178 		sc->sc_flags |= PARF_OREAD;
    179 	else
    180 		sc->sc_flags |= PARF_OWRITE;
    181 
    182 	sc->sc_burst = PAR_BURST;
    183 	sc->sc_timo = parmstohz(PAR_TIMO);
    184 	sc->sc_delay = parmstohz(PAR_DELAY);
    185 	/* enable interrupts for CIAA-FLG */
    186 	ciaa.icr = CIA_ICR_IR_SC | CIA_ICR_FLG;
    187 	return(0);
    188 }
    189 
    190 int
    191 parclose(dev, flags, mode, p)
    192 	dev_t dev;
    193 	int flags;
    194 	int mode;
    195 	struct proc *p;
    196 {
    197   int unit = UNIT(dev);
    198   struct par_softc *sc = getparsp(unit);
    199 
    200 #ifdef DEBUG
    201   if (pardebug & PDB_FOLLOW)
    202     printf("parclose(%x, %x): flags %x\n",
    203 	   dev, flags, sc->sc_flags);
    204 #endif
    205   sc->sc_flags &= ~(PARF_OPEN|PARF_OREAD|PARF_OWRITE);
    206   /* don't allow interrupts for CIAA-FLG any longer */
    207   ciaa.icr = CIA_ICR_FLG;
    208   return(0);
    209 }
    210 
    211 void
    212 parstart(arg)
    213 	void *arg;
    214 {
    215 	struct par_softc *sc = arg;
    216 
    217 #ifdef DEBUG
    218 	if (pardebug & PDB_FOLLOW)
    219 		printf("parstart(%x)\n", sc->sc_dev.dv_unit);
    220 #endif
    221 	sc->sc_flags &= ~PARF_DELAY;
    222 	wakeup(sc);
    223 }
    224 
    225 void
    226 partimo(arg)
    227 	void *arg;
    228 {
    229 	struct par_softc *sc = arg;
    230 
    231 #ifdef DEBUG
    232 	if (pardebug & PDB_FOLLOW)
    233 		printf("partimo(%x)\n", sc->sc_dev.dv_unit);
    234 #endif
    235 	sc->sc_flags &= ~(PARF_UIO|PARF_TIMO);
    236 	wakeup(sc);
    237 }
    238 
    239 int
    240 parread(dev, uio, flags)
    241 	dev_t dev;
    242 	struct uio *uio;
    243 	int flags;
    244 {
    245 
    246 #ifdef DEBUG
    247 	if (pardebug & PDB_FOLLOW)
    248 		printf("parread(%x, %p)\n", dev, uio);
    249 #endif
    250 	return (parrw(dev, uio));
    251 }
    252 
    253 
    254 int
    255 parwrite(dev, uio, flags)
    256 	dev_t dev;
    257 	struct uio *uio;
    258 	int flags;
    259 {
    260 
    261 #ifdef DEBUG
    262 	if (pardebug & PDB_FOLLOW)
    263 		printf("parwrite(%x, %p)\n", dev, uio);
    264 #endif
    265 	return (parrw(dev, uio));
    266 }
    267 
    268 
    269 int
    270 parrw(dev, uio)
    271      dev_t dev;
    272      register struct uio *uio;
    273 {
    274   int unit = UNIT(dev);
    275   register struct par_softc *sc = getparsp(unit);
    276   register int s, len, cnt;
    277   register char *cp;
    278   int error = 0, gotdata = 0;
    279   int buflen;
    280   char *buf;
    281 
    282   len = 0;
    283   cnt = 0;
    284   if (!!(sc->sc_flags & PARF_OREAD) ^ (uio->uio_rw == UIO_READ))
    285     return EINVAL;
    286 
    287   if (uio->uio_resid == 0)
    288     return(0);
    289 
    290 #ifdef DEBUG
    291   if (pardebug & (PDB_FOLLOW|PDB_IO))
    292     printf("parrw(%x, %p, %c): burst %d, timo %d, resid %x\n",
    293 	   dev, uio, uio->uio_rw == UIO_READ ? 'R' : 'W',
    294 	   sc->sc_burst, sc->sc_timo, uio->uio_resid);
    295 #endif
    296   buflen = min(sc->sc_burst, uio->uio_resid);
    297   buf = (char *)malloc(buflen, M_DEVBUF, M_WAITOK);
    298   sc->sc_flags |= PARF_UIO;
    299   if (sc->sc_timo > 0)
    300     {
    301       sc->sc_flags |= PARF_TIMO;
    302       callout_reset(&sc->sc_timo_ch, sc->sc_timo, partimo, sc);
    303     }
    304   while (uio->uio_resid > 0)
    305     {
    306       len = min(buflen, uio->uio_resid);
    307       cp = buf;
    308       if (uio->uio_rw == UIO_WRITE)
    309 	{
    310 	  error = uiomove(cp, len, uio);
    311 	  if (error)
    312 	    break;
    313 	}
    314 again:
    315       s = splbio();
    316 #if 0
    317       if ((sc->sc_flags & PARF_UIO) && hpibreq(&sc->sc_dq) == 0)
    318 	sleep(sc, PRIBIO+1);
    319 #endif
    320       /*
    321        * Check if we timed out during sleep or uiomove
    322        */
    323       (void) spllowersoftclock();
    324       if ((sc->sc_flags & PARF_UIO) == 0)
    325 	{
    326 #ifdef DEBUG
    327 	  if (pardebug & PDB_IO)
    328 	    printf("parrw: uiomove/sleep timo, flags %x\n",
    329 		   sc->sc_flags);
    330 #endif
    331 	  if (sc->sc_flags & PARF_TIMO)
    332 	    {
    333 	      callout_stop(&sc->sc_timo_ch);
    334 	      sc->sc_flags &= ~PARF_TIMO;
    335 	    }
    336 	  splx(s);
    337 	  break;
    338 	}
    339       splx(s);
    340       /*
    341        * Perform the operation
    342        */
    343       if (uio->uio_rw == UIO_WRITE)
    344 	cnt = parsend (cp, len);
    345       else
    346 	cnt = parreceive (cp, len);
    347 
    348       if (cnt < 0)
    349 	{
    350 	  error = -cnt;
    351 	  break;
    352 	}
    353 
    354       s = splbio();
    355 #if 0
    356       hpibfree(&sc->sc_dq);
    357 #endif
    358 #ifdef DEBUG
    359       if (pardebug & PDB_IO)
    360 	printf("parrw: %s(%p, %d) -> %d\n",
    361 	       uio->uio_rw == UIO_READ ? "recv" : "send", cp, len, cnt);
    362 #endif
    363       splx(s);
    364       if (uio->uio_rw == UIO_READ)
    365 	{
    366 	  if (cnt)
    367 	    {
    368 	      error = uiomove(cp, cnt, uio);
    369 	      if (error)
    370 		break;
    371 	      gotdata++;
    372 	    }
    373 	  /*
    374 	   * Didn't get anything this time, but did in the past.
    375 	   * Consider us done.
    376 	   */
    377 	  else if (gotdata)
    378 	    break;
    379 	}
    380       s = splsoftclock();
    381       /*
    382        * Operation timeout (or non-blocking), quit now.
    383        */
    384       if ((sc->sc_flags & PARF_UIO) == 0)
    385 	{
    386 #ifdef DEBUG
    387 	  if (pardebug & PDB_IO)
    388 	    printf("parrw: timeout/done\n");
    389 #endif
    390 	  splx(s);
    391 	  break;
    392 	}
    393       /*
    394        * Implement inter-read delay
    395        */
    396       if (sc->sc_delay > 0)
    397 	{
    398 	  sc->sc_flags |= PARF_DELAY;
    399 	  callout_reset(&sc->sc_start_ch, sc->sc_delay, parstart, sc);
    400 	  error = tsleep(sc, PCATCH | (PZERO - 1), "par-cdelay", 0);
    401 	  if (error)
    402 	    {
    403 	      splx(s);
    404 	      break;
    405 	    }
    406 	}
    407       splx(s);
    408       /*
    409        * Must not call uiomove again til we've used all data
    410        * that we already grabbed.
    411        */
    412       if (uio->uio_rw == UIO_WRITE && cnt != len)
    413 	{
    414 	  cp += cnt;
    415 	  len -= cnt;
    416 	  cnt = 0;
    417 	  goto again;
    418 	}
    419     }
    420   s = splsoftclock();
    421   if (sc->sc_flags & PARF_TIMO)
    422     {
    423       callout_stop(&sc->sc_timo_ch);
    424       sc->sc_flags &= ~PARF_TIMO;
    425     }
    426   if (sc->sc_flags & PARF_DELAY)
    427     {
    428       callout_stop(&sc->sc_start_ch);
    429       sc->sc_flags &= ~PARF_DELAY;
    430     }
    431   splx(s);
    432   /*
    433    * Adjust for those chars that we uiomove'ed but never wrote
    434    */
    435   if (uio->uio_rw == UIO_WRITE && cnt != len)
    436     {
    437       uio->uio_resid += (len - cnt);
    438 #ifdef DEBUG
    439       if (pardebug & PDB_IO)
    440 	printf("parrw: short write, adjust by %d\n",
    441 	       len-cnt);
    442 #endif
    443     }
    444   free(buf, M_DEVBUF);
    445 #ifdef DEBUG
    446   if (pardebug & (PDB_FOLLOW|PDB_IO))
    447     printf("parrw: return %d, resid %d\n", error, uio->uio_resid);
    448 #endif
    449   return (error);
    450 }
    451 
    452 int
    453 parioctl(dev, cmd, data, flag, p)
    454 	dev_t dev;
    455 	u_long cmd;
    456 	caddr_t data;
    457 	int flag;
    458 	struct proc *p;
    459 {
    460   struct par_softc *sc = getparsp(UNIT(dev));
    461   struct parparam *pp, *upp;
    462   int error = 0;
    463 
    464   switch (cmd)
    465     {
    466     case PARIOCGPARAM:
    467       pp = &sc->sc_param;
    468       upp = (struct parparam *)data;
    469       upp->burst = pp->burst;
    470       upp->timo = parhztoms(pp->timo);
    471       upp->delay = parhztoms(pp->delay);
    472       break;
    473 
    474     case PARIOCSPARAM:
    475       pp = &sc->sc_param;
    476       upp = (struct parparam *)data;
    477       if (upp->burst < PAR_BURST_MIN || upp->burst > PAR_BURST_MAX ||
    478 	  upp->delay < PAR_DELAY_MIN || upp->delay > PAR_DELAY_MAX)
    479 	return(EINVAL);
    480       pp->burst = upp->burst;
    481       pp->timo = parmstohz(upp->timo);
    482       pp->delay = parmstohz(upp->delay);
    483       break;
    484 
    485     default:
    486       return(EINVAL);
    487     }
    488   return (error);
    489 }
    490 
    491 int
    492 parhztoms(h)
    493      int h;
    494 {
    495   extern int hz;
    496   register int m = h;
    497 
    498   if (m > 0)
    499     m = m * 1000 / hz;
    500   return(m);
    501 }
    502 
    503 int
    504 parmstohz(m)
    505      int m;
    506 {
    507   extern int hz;
    508   register int h = m;
    509 
    510   if (h > 0) {
    511     h = h * hz / 1000;
    512     if (h == 0)
    513       h = 1000 / hz;
    514   }
    515   return(h);
    516 }
    517 
    518 /* stuff below here if for interrupt driven output of data thru
    519    the parallel port. */
    520 
    521 int partimeout_pending;
    522 int parsend_pending;
    523 
    524 void
    525 parintr(arg)
    526 	void *arg;
    527 {
    528 	int s, mask;
    529 
    530 	mask = (int)arg;
    531 	s = splclock();
    532 
    533 #ifdef DEBUG
    534 	if (pardebug & PDB_INTERRUPT)
    535 		printf("parintr %s\n", mask ? "FLG" : "tout");
    536 #endif
    537 	/*
    538 	 * if invoked from timeout handler, mask will be 0,
    539 	 * if from interrupt, it will contain the cia-icr mask,
    540 	 * which is != 0
    541 	 */
    542 	if (mask) {
    543 		if (partimeout_pending)
    544 			callout_stop(&parintr_ch);
    545 		if (parsend_pending)
    546 			parsend_pending = 0;
    547 	}
    548 
    549 	/* either way, there won't be a timeout pending any longer */
    550 	partimeout_pending = 0;
    551 
    552 	wakeup(parintr);
    553 	splx(s);
    554 }
    555 
    556 int
    557 parsendch (ch)
    558      u_char ch;
    559 {
    560   int error = 0;
    561   int s;
    562 
    563   /* if either offline, busy or out of paper, wait for that
    564      condition to clear */
    565   s = splclock();
    566   while (!error
    567 	 && (parsend_pending
    568 	     || ((ciab.pra ^ CIAB_PRA_SEL)
    569 		 & (CIAB_PRA_SEL|CIAB_PRA_BUSY|CIAB_PRA_POUT))))
    570     {
    571       extern int hz;
    572 
    573 #ifdef DEBUG
    574       if (pardebug & PDB_INTERRUPT)
    575 	printf ("parsendch, port = $%x\n",
    576 		((ciab.pra ^ CIAB_PRA_SEL)
    577 		 & (CIAB_PRA_SEL|CIAB_PRA_BUSY|CIAB_PRA_POUT)));
    578 #endif
    579       /* wait a second, and try again */
    580       callout_reset(&parintr_ch, hz, parintr, NULL);
    581       partimeout_pending = 1;
    582       /* this is essentially a flipflop to have us wait for the
    583 	 first character being transmitted when trying to transmit
    584 	 the second, etc. */
    585       parsend_pending = 0;
    586       /* it's quite important that a parallel putc can be
    587 	 interrupted, given the possibility to lock a printer
    588 	 in an offline condition.. */
    589       if ((error = tsleep(parintr, PCATCH | (PZERO - 1), "parsendch", 0)) > 0)
    590 	{
    591 #ifdef DEBUG
    592 	  if (pardebug & PDB_INTERRUPT)
    593 	    printf ("parsendch interrupted, error = %d\n", error);
    594 #endif
    595 	  if (partimeout_pending)
    596 	    callout_stop(&parintr_ch);
    597 
    598 	  partimeout_pending = 0;
    599 	}
    600     }
    601 
    602   if (! error)
    603     {
    604 #ifdef DEBUG
    605       if (pardebug & PDB_INTERRUPT)
    606 	printf ("#%d", ch);
    607 #endif
    608       ciaa.prb = ch;
    609       parsend_pending = 1;
    610     }
    611 
    612   splx (s);
    613 
    614   return error;
    615 }
    616 
    617 
    618 int
    619 parsend (buf, len)
    620      u_char *buf;
    621      int len;
    622 {
    623   int err, orig_len = len;
    624 
    625   /* make sure I/O lines are setup right for output */
    626 
    627   /* control lines set to input */
    628   ciab.ddra &= ~(CIAB_PRA_SEL|CIAB_PRA_POUT|CIAB_PRA_BUSY);
    629   /* data lines to output */
    630   ciaa.ddrb = 0xff;
    631 
    632   for (; len; len--, buf++)
    633     if ((err = parsendch (*buf)) != 0)
    634       return err < 0 ? -EINTR : -err;
    635 
    636   /* either all or nothing.. */
    637   return orig_len;
    638 }
    639 
    640 
    641 
    642 int
    643 parreceive (buf, len)
    644      u_char *buf;
    645      int len;
    646 {
    647   /* oh deary me, something's gotta be left to be implemented
    648      later... */
    649   return 0;
    650 }
    651 
    652 
    653 #endif
    654