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lpt.c revision 1.8 
      1 /*	$NetBSD: lpt.c,v 1.8 1996/12/20 12:49:42 leo Exp $ */
      2 
      3 /*
      4  * Copyright (c) 1996 Leo Weppelman
      5  * Copyright (c) 1993, 1994 Charles Hannum.
      6  * Copyright (c) 1990 William F. Jolitz, TeleMuse
      7  * All rights reserved.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. All advertising materials mentioning features or use of this software
     18  *    must display the following acknowledgement:
     19  *	This software is a component of "386BSD" developed by
     20  *	William F. Jolitz, TeleMuse.
     21  * 4. Neither the name of the developer nor the name "386BSD"
     22  *    may be used to endorse or promote products derived from this software
     23  *    without specific prior written permission.
     24  *
     25  * THIS SOFTWARE IS A COMPONENT OF 386BSD DEVELOPED BY WILLIAM F. JOLITZ
     26  * AND IS INTENDED FOR RESEARCH AND EDUCATIONAL PURPOSES ONLY. THIS
     27  * SOFTWARE SHOULD NOT BE CONSIDERED TO BE A COMMERCIAL PRODUCT.
     28  * THE DEVELOPER URGES THAT USERS WHO REQUIRE A COMMERCIAL PRODUCT
     29  * NOT MAKE USE OF THIS WORK.
     30  *
     31  * FOR USERS WHO WISH TO UNDERSTAND THE 386BSD SYSTEM DEVELOPED
     32  * BY WILLIAM F. JOLITZ, WE RECOMMEND THE USER STUDY WRITTEN
     33  * REFERENCES SUCH AS THE  "PORTING UNIX TO THE 386" SERIES
     34  * (BEGINNING JANUARY 1991 "DR. DOBBS JOURNAL", USA AND BEGINNING
     35  * JUNE 1991 "UNIX MAGAZIN", GERMANY) BY WILLIAM F. JOLITZ AND
     36  * LYNNE GREER JOLITZ, AS WELL AS OTHER BOOKS ON UNIX AND THE
     37  * ON-LINE 386BSD USER MANUAL BEFORE USE. A BOOK DISCUSSING THE INTERNALS
     38  * OF 386BSD ENTITLED "386BSD FROM THE INSIDE OUT" WILL BE AVAILABLE LATE 1992.
     39  *
     40  * THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``AS IS'' AND
     41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE DEVELOPER BE LIABLE
     44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     50  * SUCH DAMAGE.
     51  */
     52 
     53 /*
     54  * Device Driver originally written for AT parallel printer port. Now
     55  * drives the printer port on the YM2149.
     56  */
     57 
     58 #include <sys/param.h>
     59 #include <sys/systm.h>
     60 #include <sys/proc.h>
     61 #include <sys/user.h>
     62 #include <sys/buf.h>
     63 #include <sys/kernel.h>
     64 #include <sys/ioctl.h>
     65 #include <sys/uio.h>
     66 #include <sys/device.h>
     67 #include <sys/conf.h>
     68 #include <sys/syslog.h>
     69 
     70 #include <machine/cpu.h>
     71 #include <machine/iomap.h>
     72 #include <machine/mfp.h>
     73 
     74 #include <atari/dev/ym2149reg.h>
     75 
     76 #define	TIMEOUT		hz*16	/* wait up to 16 seconds for a ready */
     77 #define	STEP		hz/4
     78 
     79 #define	LPTPRI		(PZERO+8)
     80 #define	LPT_BSIZE	1024
     81 
     82 #if !defined(DEBUG) || !defined(notdef)
     83 #define lprintf		if (0) printf
     84 #else
     85 #define lprintf		if (lptdebug) printf
     86 int lptdebug = 1;
     87 #endif
     88 
     89 struct lpt_softc {
     90 	struct device	sc_dev;
     91 	size_t		sc_count;
     92 	struct buf	*sc_inbuf;
     93 	u_char		*sc_cp;
     94 	int		sc_spinmax;
     95 	u_char		sc_state;
     96 #define	LPT_OPEN	0x01	/* device is open */
     97 #define	LPT_OBUSY	0x02	/* printer is busy doing output */
     98 #define	LPT_INIT	0x04	/* waiting to initialize for open */
     99 	u_char		sc_flags;
    100 #define	LPT_AUTOLF	0x20	/* automatic LF on CR XXX: LWP - not yet... */
    101 #define	LPT_NOINTR	0x40	/* do not use interrupt */
    102 };
    103 
    104 #define	LPTUNIT(s)	(minor(s) & 0x1f)
    105 #define	LPTFLAGS(s)	(minor(s) & 0xe0)
    106 #define	NOT_READY()	(MFP->mf_gpip & IO_PBSY)
    107 
    108 /* {b,c}devsw[] function prototypes */
    109 dev_type_open(lptopen);
    110 dev_type_close(lptclose);
    111 dev_type_write(lptwrite);
    112 dev_type_ioctl(lptioctl);
    113 
    114 static void lptwakeup __P((void *arg));
    115 static int pushbytes __P((struct lpt_softc *));
    116 static void lptpseudointr __P((void));
    117 int lptintr __P((void));
    118 int lpthwintr __P((int));
    119 
    120 
    121 /*
    122  * Autoconfig stuff
    123  */
    124 static void lptattach __P((struct device *, struct device *, void *));
    125 static int  lptmatch __P((struct device *, struct cfdata *, void *));
    126 
    127 struct cfattach lpt_ca = {
    128 	sizeof(struct lpt_softc), lptmatch, lptattach
    129 };
    130 
    131 struct cfdriver lpt_cd = {
    132 	NULL, "lpt", DV_DULL, NULL, 0
    133 };
    134 
    135 /*ARGSUSED*/
    136 static	int
    137 lptmatch(pdp, cfp, auxp)
    138 struct	device	*pdp;
    139 struct	cfdata	*pdp;
    140 void		*auxp;
    141 {
    142 	if (!strcmp((char *)auxp, "lpt") && cfp->cf_unit == 0)
    143 		return (1);
    144 	return (0);
    145 }
    146 
    147 /*ARGSUSED*/
    148 static void
    149 lptattach(pdp, dp, auxp)
    150 struct	device *pdp, *dp;
    151 void	*auxp;
    152 {
    153 	struct lpt_softc *sc = (void *)dp;
    154 
    155 	sc->sc_state = 0;
    156 
    157 	ym2149_strobe(1);
    158 
    159 	printf("\n");
    160 }
    161 
    162 /*
    163  * Reset the printer, then wait until it's selected and not busy.
    164  */
    165 int
    166 lptopen(dev, flag, mode, p)
    167 	dev_t		dev;
    168 	int		flag, mode;
    169 	struct proc	*p;
    170 {
    171 	int			unit = LPTUNIT(dev);
    172 	u_char			flags = LPTFLAGS(dev);
    173 	struct lpt_softc	*sc;
    174 	int 			error;
    175 	int			spin;
    176 	int			sps;
    177 
    178 	if (unit >= lpt_cd.cd_ndevs)
    179 		return ENXIO;
    180 	sc = lpt_cd.cd_devs[unit];
    181 	if (!sc)
    182 		return ENXIO;
    183 
    184 #ifdef DIAGNOSTIC
    185 	if (sc->sc_state)
    186 		printf("%s: stat=0x%x not zero\n", sc->sc_dev.dv_xname,
    187 		    sc->sc_state);
    188 #endif
    189 
    190 	if (sc->sc_state)
    191 		return EBUSY;
    192 
    193 	sc->sc_state = LPT_INIT;
    194 	sc->sc_flags = flags;
    195 	lprintf("%s: open: flags=0x%x\n", sc->sc_dev.dv_xname, flags);
    196 
    197 	/* wait till ready (printer running diagnostics) */
    198 	for (spin = 0; NOT_READY(); spin += STEP) {
    199 		if (spin >= TIMEOUT) {
    200 			sc->sc_state = 0;
    201 			return EBUSY;
    202 		}
    203 
    204 		/* wait 1/4 second, give up if we get a signal */
    205 		if ((error = tsleep((caddr_t)sc, LPTPRI | PCATCH, "lptopen",
    206 		     STEP)) != EWOULDBLOCK) {
    207 			sc->sc_state = 0;
    208 			return error;
    209 		}
    210 	}
    211 
    212 	sc->sc_inbuf = geteblk(LPT_BSIZE);
    213 	sc->sc_count = 0;
    214 	sc->sc_state = LPT_OPEN;
    215 
    216 	if ((sc->sc_flags & LPT_NOINTR) == 0) {
    217 		lptwakeup(sc);
    218 
    219 		sps = splhigh();
    220 		MFP->mf_imrb |= IB_PBSY;
    221 		MFP->mf_ierb |= IB_PBSY;
    222 		splx(sps);
    223 	}
    224 
    225 	lprintf("%s: opened\n", sc->sc_dev.dv_xname);
    226 	return 0;
    227 }
    228 
    229 void
    230 lptwakeup(arg)
    231 	void *arg;
    232 {
    233 	struct lpt_softc *sc = arg;
    234 
    235 	lptpseudointr();
    236 
    237 	timeout(lptwakeup, sc, STEP);
    238 }
    239 
    240 /*
    241  * Close the device, and free the local line buffer.
    242  */
    243 int
    244 lptclose(dev, flag, mode, p)
    245 	dev_t		dev;
    246 	int		flag;
    247 	int		mode;
    248 	struct proc	*p;
    249 {
    250 	int		 unit = LPTUNIT(dev);
    251 	struct lpt_softc *sc = lpt_cd.cd_devs[unit];
    252 	int		 sps;
    253 
    254 	if (sc->sc_count)
    255 		(void) pushbytes(sc);
    256 
    257 	if ((sc->sc_flags & LPT_NOINTR) == 0) {
    258 		untimeout(lptwakeup, sc);
    259 
    260 		sps = splhigh();
    261 		MFP->mf_ierb &= ~IB_PBSY;
    262 		MFP->mf_imrb &= ~IB_PBSY;
    263 		splx(sps);
    264 	}
    265 
    266 	sc->sc_state = 0;
    267 	brelse(sc->sc_inbuf);
    268 
    269 	lprintf("%s: closed\n", sc->sc_dev.dv_xname);
    270 	return 0;
    271 }
    272 
    273 int
    274 pushbytes(sc)
    275 	struct lpt_softc *sc;
    276 {
    277 	int	error;
    278 
    279 	if (sc->sc_flags & LPT_NOINTR) {
    280 		int spin, tic;
    281 
    282 		while (sc->sc_count > 0) {
    283 			spin = 0;
    284 			while (NOT_READY()) {
    285 				if (++spin < sc->sc_spinmax)
    286 					continue;
    287 				tic = 0;
    288 				/* adapt busy-wait algorithm */
    289 				sc->sc_spinmax++;
    290 				while (NOT_READY()) {
    291 					/* exponential backoff */
    292 					tic = tic + tic + 1;
    293 					if (tic > TIMEOUT)
    294 						tic = TIMEOUT;
    295 					error = tsleep((caddr_t)sc,
    296 					    LPTPRI | PCATCH, "lptpsh", tic);
    297 					if (error != EWOULDBLOCK)
    298 						return error;
    299 				}
    300 				break;
    301 			}
    302 
    303 			ym2149_write_ioport(YM_IOB, *sc->sc_cp++);
    304 			ym2149_strobe(0);
    305 			sc->sc_count--;
    306 			ym2149_strobe(1);
    307 
    308 			/* adapt busy-wait algorithm */
    309 			if (spin*2 + 16 < sc->sc_spinmax)
    310 				sc->sc_spinmax--;
    311 		}
    312 	} else {
    313 		while (sc->sc_count > 0) {
    314 			/* if the printer is ready for a char, give it one */
    315 			if ((sc->sc_state & LPT_OBUSY) == 0) {
    316 				lprintf("%s: write %d\n", sc->sc_dev.dv_xname,
    317 				    sc->sc_count);
    318 				(void) lptpseudointr();
    319 			}
    320 			if ((error = tsleep((caddr_t)sc, LPTPRI | PCATCH,
    321 			     "lptwrite2", 0)) != 0)
    322 				return error;
    323 		}
    324 	}
    325 	return 0;
    326 }
    327 
    328 /*
    329  * Copy a line from user space to a local buffer, then call putc to get the
    330  * chars moved to the output queue.
    331  */
    332 int
    333 lptwrite(dev, uio, flags)
    334 	dev_t		dev;
    335 	struct uio	*uio;
    336 	int		flags;
    337 {
    338 	struct lpt_softc *sc = lpt_cd.cd_devs[LPTUNIT(dev)];
    339 	size_t n;
    340 	int error = 0;
    341 
    342 	while ((n = min(LPT_BSIZE, uio->uio_resid)) > 0) {
    343 		uiomove(sc->sc_cp = sc->sc_inbuf->b_data, n, uio);
    344 		sc->sc_count = n;
    345 		error = pushbytes(sc);
    346 		if (error) {
    347 			/*
    348 			 * Return accurate residual if interrupted or timed
    349 			 * out.
    350 			 */
    351 			uio->uio_resid += sc->sc_count;
    352 			sc->sc_count = 0;
    353 			return error;
    354 		}
    355 	}
    356 	return 0;
    357 }
    358 
    359 /*
    360  * Handle printer interrupts which occur when the printer is ready to accept
    361  * another char.
    362  */
    363 int
    364 lptintr()
    365 {
    366 	struct lpt_softc *sc;
    367 
    368 	sc = lpt_cd.cd_devs[0]; /* XXX: LWP - we have only one on the Atari */
    369 
    370 	/* is printer online and ready for output */
    371 	if (NOT_READY())
    372 		return 0;
    373 
    374 	if (sc->sc_count) {
    375 
    376 		/* send char */
    377 		ym2149_write_ioport(YM_IOB, *sc->sc_cp++);
    378 		ym2149_strobe(0);
    379 		sc->sc_count--;
    380 		ym2149_strobe(1);
    381 		sc->sc_state |= LPT_OBUSY;
    382 	} else
    383 		sc->sc_state &= ~LPT_OBUSY;
    384 
    385 	if (sc->sc_count == 0) {
    386 		/* none, wake up the top half to get more */
    387 		wakeup((caddr_t)sc);
    388 	}
    389 
    390 	return 1;
    391 }
    392 
    393 static void
    394 lptpseudointr()
    395 {
    396 	int	s;
    397 
    398 	s = spltty();
    399 	lptintr();
    400 	splx(s);
    401 }
    402 
    403 int
    404 lpthwintr(sr)
    405 int	sr;
    406 {
    407 	if (!BASEPRI(sr))
    408 		add_sicallback((si_farg)lptpseudointr, NULL, 0);
    409 	else lptpseudointr();
    410 	return 1;
    411 }
    412 
    413 int
    414 lptioctl(dev, cmd, data, flag, p)
    415 	dev_t		dev;
    416 	u_long		cmd;
    417 	caddr_t		data;
    418 	int		flag;
    419 	struct proc	*p;
    420 {
    421 	int error = 0;
    422 
    423 	switch (cmd) {
    424 	default:
    425 		error = ENODEV;
    426 	}
    427 
    428 	return error;
    429 }
    430