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par.c revision 1.23 
      1 /*	$NetBSD: par.c,v 1.23 2000/08/27 10:35:43 is 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 /* sc_flags values */
     78 #define	PARF_ALIVE	0x01
     79 #define	PARF_OPEN	0x02
     80 #define PARF_UIO	0x04
     81 #define PARF_TIMO	0x08
     82 #define PARF_DELAY	0x10
     83 #define PARF_OREAD	0x40
     84 #define PARF_OWRITE	0x80
     85 
     86 #define UNIT(x)		minor(x)
     87 
     88 #ifdef DEBUG
     89 int	pardebug = 0;
     90 #define PDB_FOLLOW	0x01
     91 #define PDB_IO		0x02
     92 #define PDB_INTERRUPT   0x04
     93 #define PDB_NOCHECK	0x80
     94 #endif
     95 
     96 int parrw __P((dev_t, struct uio *));
     97 int parhztoms __P((int));
     98 int parmstohz __P((int));
     99 int parsend __P((u_char *, int));
    100 int parreceive __P((u_char *, int));
    101 int parsendch __P((u_char));
    102 
    103 void partimo __P((void *));
    104 void parstart __P((void *));
    105 void parintr __P((void *));
    106 
    107 void parattach __P((struct device *, struct device *, void *));
    108 int parmatch __P((struct device *, struct cfdata *, void *));
    109 
    110 struct cfattach par_ca = {
    111 	sizeof(struct par_softc), parmatch, parattach
    112 };
    113 
    114 /*ARGSUSED*/
    115 int
    116 parmatch(pdp, cfp, auxp)
    117 	struct device *pdp;
    118 	struct cfdata *cfp;
    119 	void *auxp;
    120 {
    121 	static int par_found = 0;
    122 
    123 	if (!matchname((char *)auxp, "par") || par_found)
    124 		return(0);
    125 
    126 	par_found = 1;
    127 	return(1);
    128 }
    129 
    130 void
    131 parattach(pdp, dp, auxp)
    132 	struct device *pdp, *dp;
    133 	void *auxp;
    134 {
    135 	par_softcp = (struct par_softc *)dp;
    136 
    137 #ifdef DEBUG
    138 	if ((pardebug & PDB_NOCHECK) == 0)
    139 #endif
    140 		par_softcp->sc_flags = PARF_ALIVE;
    141 	printf("\n");
    142 
    143 	callout_init(&par_softcp->sc_timo_ch);
    144 	callout_init(&par_softcp->sc_start_ch);
    145 }
    146 
    147 int
    148 paropen(dev, flags, mode, p)
    149 	dev_t dev;
    150 	int flags;
    151 	int mode;
    152 	struct proc *p;
    153 {
    154 	int unit = UNIT(dev);
    155 	struct par_softc *sc = getparsp(unit);
    156 
    157 	if (unit >= NPAR || (sc->sc_flags & PARF_ALIVE) == 0)
    158 		return(ENXIO);
    159 #ifdef DEBUG
    160 	if (pardebug & PDB_FOLLOW) {
    161 		printf("paropen(%x, %x): flags %x, ",
    162 		    dev, flags, sc->sc_flags);
    163 		printf ("port = $%x\n", ((ciab.pra ^ CIAB_PRA_SEL)
    164 		    & (CIAB_PRA_SEL|CIAB_PRA_BUSY|CIAB_PRA_POUT)));
    165 	}
    166 #endif
    167 	if (sc->sc_flags & PARF_OPEN)
    168 		return(EBUSY);
    169 	/* can either read or write, but not both */
    170 	if ((flags & (FREAD|FWRITE)) == (FREAD|FWRITE))
    171 		return EINVAL;
    172 
    173 	sc->sc_flags |= PARF_OPEN;
    174 
    175 	if (flags & FREAD)
    176 		sc->sc_flags |= PARF_OREAD;
    177 	else
    178 		sc->sc_flags |= PARF_OWRITE;
    179 
    180 	sc->sc_burst = PAR_BURST;
    181 	sc->sc_timo = parmstohz(PAR_TIMO);
    182 	sc->sc_delay = parmstohz(PAR_DELAY);
    183 	/* enable interrupts for CIAA-FLG */
    184 	ciaa.icr = CIA_ICR_IR_SC | CIA_ICR_FLG;
    185 	return(0);
    186 }
    187 
    188 int
    189 parclose(dev, flags, mode, p)
    190 	dev_t dev;
    191 	int flags;
    192 	int mode;
    193 	struct proc *p;
    194 {
    195   int unit = UNIT(dev);
    196   struct par_softc *sc = getparsp(unit);
    197 
    198 #ifdef DEBUG
    199   if (pardebug & PDB_FOLLOW)
    200     printf("parclose(%x, %x): flags %x\n",
    201 	   dev, flags, sc->sc_flags);
    202 #endif
    203   sc->sc_flags &= ~(PARF_OPEN|PARF_OREAD|PARF_OWRITE);
    204   /* don't allow interrupts for CIAA-FLG any longer */
    205   ciaa.icr = CIA_ICR_FLG;
    206   return(0);
    207 }
    208 
    209 void
    210 parstart(arg)
    211 	void *arg;
    212 {
    213 	struct par_softc *sc = arg;
    214 
    215 #ifdef DEBUG
    216 	if (pardebug & PDB_FOLLOW)
    217 		printf("parstart(%x)\n", sc->sc_dev.dv_unit);
    218 #endif
    219 	sc->sc_flags &= ~PARF_DELAY;
    220 	wakeup(sc);
    221 }
    222 
    223 void
    224 partimo(arg)
    225 	void *arg;
    226 {
    227 	struct par_softc *sc = arg;
    228 
    229 #ifdef DEBUG
    230 	if (pardebug & PDB_FOLLOW)
    231 		printf("partimo(%x)\n", sc->sc_dev.dv_unit);
    232 #endif
    233 	sc->sc_flags &= ~(PARF_UIO|PARF_TIMO);
    234 	wakeup(sc);
    235 }
    236 
    237 int
    238 parread(dev, uio, flags)
    239 	dev_t dev;
    240 	struct uio *uio;
    241 	int flags;
    242 {
    243 
    244 #ifdef DEBUG
    245 	if (pardebug & PDB_FOLLOW)
    246 		printf("parread(%x, %p)\n", dev, uio);
    247 #endif
    248 	return (parrw(dev, uio));
    249 }
    250 
    251 
    252 int
    253 parwrite(dev, uio, flags)
    254 	dev_t dev;
    255 	struct uio *uio;
    256 	int flags;
    257 {
    258 
    259 #ifdef DEBUG
    260 	if (pardebug & PDB_FOLLOW)
    261 		printf("parwrite(%x, %p)\n", dev, uio);
    262 #endif
    263 	return (parrw(dev, uio));
    264 }
    265 
    266 
    267 int
    268 parrw(dev, uio)
    269      dev_t dev;
    270      register struct uio *uio;
    271 {
    272   int unit = UNIT(dev);
    273   register struct par_softc *sc = getparsp(unit);
    274   register int s, len, cnt;
    275   register char *cp;
    276   int error = 0, gotdata = 0;
    277   int buflen;
    278   char *buf;
    279 
    280   len = 0;
    281   cnt = 0;
    282   if (!!(sc->sc_flags & PARF_OREAD) ^ (uio->uio_rw == UIO_READ))
    283     return EINVAL;
    284 
    285   if (uio->uio_resid == 0)
    286     return(0);
    287 
    288 #ifdef DEBUG
    289   if (pardebug & (PDB_FOLLOW|PDB_IO))
    290     printf("parrw(%x, %p, %c): burst %d, timo %d, resid %x\n",
    291 	   dev, uio, uio->uio_rw == UIO_READ ? 'R' : 'W',
    292 	   sc->sc_burst, sc->sc_timo, uio->uio_resid);
    293 #endif
    294   buflen = min(sc->sc_burst, uio->uio_resid);
    295   buf = (char *)malloc(buflen, M_DEVBUF, M_WAITOK);
    296   sc->sc_flags |= PARF_UIO;
    297   if (sc->sc_timo > 0)
    298     {
    299       sc->sc_flags |= PARF_TIMO;
    300       callout_reset(&sc->sc_timo_ch, sc->sc_timo, partimo, sc);
    301     }
    302   while (uio->uio_resid > 0)
    303     {
    304       len = min(buflen, uio->uio_resid);
    305       cp = buf;
    306       if (uio->uio_rw == UIO_WRITE)
    307 	{
    308 	  error = uiomove(cp, len, uio);
    309 	  if (error)
    310 	    break;
    311 	}
    312 again:
    313       s = splbio();
    314 #if 0
    315       if ((sc->sc_flags & PARF_UIO) && hpibreq(&sc->sc_dq) == 0)
    316 	sleep(sc, PRIBIO+1);
    317 #endif
    318       /*
    319        * Check if we timed out during sleep or uiomove
    320        */
    321       (void) spllowersoftclock();
    322       if ((sc->sc_flags & PARF_UIO) == 0)
    323 	{
    324 #ifdef DEBUG
    325 	  if (pardebug & PDB_IO)
    326 	    printf("parrw: uiomove/sleep timo, flags %x\n",
    327 		   sc->sc_flags);
    328 #endif
    329 	  if (sc->sc_flags & PARF_TIMO)
    330 	    {
    331 	      callout_stop(&sc->sc_timo_ch);
    332 	      sc->sc_flags &= ~PARF_TIMO;
    333 	    }
    334 	  splx(s);
    335 	  break;
    336 	}
    337       splx(s);
    338       /*
    339        * Perform the operation
    340        */
    341       if (uio->uio_rw == UIO_WRITE)
    342 	cnt = parsend (cp, len);
    343       else
    344 	cnt = parreceive (cp, len);
    345 
    346       if (cnt < 0)
    347 	{
    348 	  error = -cnt;
    349 	  break;
    350 	}
    351 
    352       s = splbio();
    353 #if 0
    354       hpibfree(&sc->sc_dq);
    355 #endif
    356 #ifdef DEBUG
    357       if (pardebug & PDB_IO)
    358 	printf("parrw: %s(%p, %d) -> %d\n",
    359 	       uio->uio_rw == UIO_READ ? "recv" : "send", cp, len, cnt);
    360 #endif
    361       splx(s);
    362       if (uio->uio_rw == UIO_READ)
    363 	{
    364 	  if (cnt)
    365 	    {
    366 	      error = uiomove(cp, cnt, uio);
    367 	      if (error)
    368 		break;
    369 	      gotdata++;
    370 	    }
    371 	  /*
    372 	   * Didn't get anything this time, but did in the past.
    373 	   * Consider us done.
    374 	   */
    375 	  else if (gotdata)
    376 	    break;
    377 	}
    378       s = splsoftclock();
    379       /*
    380        * Operation timeout (or non-blocking), quit now.
    381        */
    382       if ((sc->sc_flags & PARF_UIO) == 0)
    383 	{
    384 #ifdef DEBUG
    385 	  if (pardebug & PDB_IO)
    386 	    printf("parrw: timeout/done\n");
    387 #endif
    388 	  splx(s);
    389 	  break;
    390 	}
    391       /*
    392        * Implement inter-read delay
    393        */
    394       if (sc->sc_delay > 0)
    395 	{
    396 	  sc->sc_flags |= PARF_DELAY;
    397 	  callout_reset(&sc->sc_start_ch, sc->sc_delay, parstart, sc);
    398 	  error = tsleep(sc, PCATCH | (PZERO - 1), "par-cdelay", 0);
    399 	  if (error)
    400 	    {
    401 	      splx(s);
    402 	      break;
    403 	    }
    404 	}
    405       splx(s);
    406       /*
    407        * Must not call uiomove again til we've used all data
    408        * that we already grabbed.
    409        */
    410       if (uio->uio_rw == UIO_WRITE && cnt != len)
    411 	{
    412 	  cp += cnt;
    413 	  len -= cnt;
    414 	  cnt = 0;
    415 	  goto again;
    416 	}
    417     }
    418   s = splsoftclock();
    419   if (sc->sc_flags & PARF_TIMO)
    420     {
    421       callout_stop(&sc->sc_timo_ch);
    422       sc->sc_flags &= ~PARF_TIMO;
    423     }
    424   if (sc->sc_flags & PARF_DELAY)
    425     {
    426       callout_stop(&sc->sc_start_ch);
    427       sc->sc_flags &= ~PARF_DELAY;
    428     }
    429   splx(s);
    430   /*
    431    * Adjust for those chars that we uiomove'ed but never wrote
    432    */
    433   if (uio->uio_rw == UIO_WRITE && cnt != len)
    434     {
    435       uio->uio_resid += (len - cnt);
    436 #ifdef DEBUG
    437       if (pardebug & PDB_IO)
    438 	printf("parrw: short write, adjust by %d\n",
    439 	       len-cnt);
    440 #endif
    441     }
    442   free(buf, M_DEVBUF);
    443 #ifdef DEBUG
    444   if (pardebug & (PDB_FOLLOW|PDB_IO))
    445     printf("parrw: return %d, resid %d\n", error, uio->uio_resid);
    446 #endif
    447   return (error);
    448 }
    449 
    450 int
    451 parioctl(dev, cmd, data, flag, p)
    452 	dev_t dev;
    453 	u_long cmd;
    454 	caddr_t data;
    455 	int flag;
    456 	struct proc *p;
    457 {
    458   struct par_softc *sc = getparsp(UNIT(dev));
    459   struct parparam *pp, *upp;
    460   int error = 0;
    461 
    462   switch (cmd)
    463     {
    464     case PARIOCGPARAM:
    465       pp = &sc->sc_param;
    466       upp = (struct parparam *)data;
    467       upp->burst = pp->burst;
    468       upp->timo = parhztoms(pp->timo);
    469       upp->delay = parhztoms(pp->delay);
    470       break;
    471 
    472     case PARIOCSPARAM:
    473       pp = &sc->sc_param;
    474       upp = (struct parparam *)data;
    475       if (upp->burst < PAR_BURST_MIN || upp->burst > PAR_BURST_MAX ||
    476 	  upp->delay < PAR_DELAY_MIN || upp->delay > PAR_DELAY_MAX)
    477 	return(EINVAL);
    478       pp->burst = upp->burst;
    479       pp->timo = parmstohz(upp->timo);
    480       pp->delay = parmstohz(upp->delay);
    481       break;
    482 
    483     default:
    484       return(EINVAL);
    485     }
    486   return (error);
    487 }
    488 
    489 int
    490 parhztoms(h)
    491      int h;
    492 {
    493   extern int hz;
    494   register int m = h;
    495 
    496   if (m > 0)
    497     m = m * 1000 / hz;
    498   return(m);
    499 }
    500 
    501 int
    502 parmstohz(m)
    503      int m;
    504 {
    505   extern int hz;
    506   register int h = m;
    507 
    508   if (h > 0) {
    509     h = h * hz / 1000;
    510     if (h == 0)
    511       h = 1000 / hz;
    512   }
    513   return(h);
    514 }
    515 
    516 /* stuff below here if for interrupt driven output of data thru
    517    the parallel port. */
    518 
    519 int parsend_pending;
    520 
    521 void
    522 parintr(arg)
    523 	void *arg;
    524 {
    525 	int s;
    526 
    527 	s = splclock();
    528 
    529 #ifdef DEBUG
    530 	if (pardebug & PDB_INTERRUPT)
    531 		printf("parintr\n");
    532 #endif
    533 	parsend_pending = 0;
    534 
    535 	wakeup(parintr);
    536 	splx(s);
    537 }
    538 
    539 int
    540 parsendch (ch)
    541      u_char ch;
    542 {
    543   int error = 0;
    544   int s;
    545 
    546   /* if either offline, busy or out of paper, wait for that
    547      condition to clear */
    548   s = splclock();
    549   while (!error
    550 	 && (parsend_pending
    551 	     || ((ciab.pra ^ CIAB_PRA_SEL)
    552 		 & (CIAB_PRA_SEL|CIAB_PRA_BUSY|CIAB_PRA_POUT))))
    553     {
    554       extern int hz;
    555 
    556 #ifdef DEBUG
    557       if (pardebug & PDB_INTERRUPT)
    558 	printf ("parsendch, port = $%x\n",
    559 		((ciab.pra ^ CIAB_PRA_SEL)
    560 		 & (CIAB_PRA_SEL|CIAB_PRA_BUSY|CIAB_PRA_POUT)));
    561 #endif
    562       /* this is essentially a flipflop to have us wait for the
    563 	 first character being transmitted when trying to transmit
    564 	 the second, etc. */
    565       parsend_pending = 0;
    566       /* it's quite important that a parallel putc can be
    567 	 interrupted, given the possibility to lock a printer
    568 	 in an offline condition.. */
    569       error = tsleep(parintr, PCATCH | (PZERO - 1), "parsendch", hz);
    570       if (error == EWOULDBLOCK)
    571 	error = 0;
    572       if (error > 0)
    573 	{
    574 #ifdef DEBUG
    575 	  if (pardebug & PDB_INTERRUPT)
    576 	    printf ("parsendch interrupted, error = %d\n", error);
    577 #endif
    578 	}
    579     }
    580 
    581   if (! error)
    582     {
    583 #ifdef DEBUG
    584       if (pardebug & PDB_INTERRUPT)
    585 	printf ("#%d", ch);
    586 #endif
    587       ciaa.prb = ch;
    588       parsend_pending = 1;
    589     }
    590 
    591   splx (s);
    592 
    593   return error;
    594 }
    595 
    596 
    597 int
    598 parsend (buf, len)
    599      u_char *buf;
    600      int len;
    601 {
    602   int err, orig_len = len;
    603 
    604   /* make sure I/O lines are setup right for output */
    605 
    606   /* control lines set to input */
    607   ciab.ddra &= ~(CIAB_PRA_SEL|CIAB_PRA_POUT|CIAB_PRA_BUSY);
    608   /* data lines to output */
    609   ciaa.ddrb = 0xff;
    610 
    611   for (; len; len--, buf++)
    612     if ((err = parsendch (*buf)) != 0)
    613       return err < 0 ? -EINTR : -err;
    614 
    615   /* either all or nothing.. */
    616   return orig_len;
    617 }
    618 
    619 
    620 
    621 int
    622 parreceive (buf, len)
    623      u_char *buf;
    624      int len;
    625 {
    626   /* oh deary me, something's gotta be left to be implemented
    627      later... */
    628   return 0;
    629 }
    630 
    631 
    632 #endif
    633