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lpt.c revision 1.7 
      1 /*	$NetBSD: lpt.c,v 1.7 1996/11/17 13:47:21 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 *, void *, 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, match, auxp)
    138 struct	device *pdp;
    139 void	*match, *auxp;
    140 {
    141 	struct cfdata *cfp = match;
    142 
    143 	if (!strcmp((char *)auxp, "lpt") && cfp->cf_unit == 0)
    144 		return (1);
    145 	return (0);
    146 }
    147 
    148 /*ARGSUSED*/
    149 static void
    150 lptattach(pdp, dp, auxp)
    151 struct	device *pdp, *dp;
    152 void	*auxp;
    153 {
    154 	struct lpt_softc *sc = (void *)dp;
    155 
    156 	sc->sc_state = 0;
    157 
    158 	ym2149_strobe(1);
    159 
    160 	printf("\n");
    161 }
    162 
    163 /*
    164  * Reset the printer, then wait until it's selected and not busy.
    165  */
    166 int
    167 lptopen(dev, flag, mode, p)
    168 	dev_t		dev;
    169 	int		flag, mode;
    170 	struct proc	*p;
    171 {
    172 	int			unit = LPTUNIT(dev);
    173 	u_char			flags = LPTFLAGS(dev);
    174 	struct lpt_softc	*sc;
    175 	int 			error;
    176 	int			spin;
    177 	int			sps;
    178 
    179 	if (unit >= lpt_cd.cd_ndevs)
    180 		return ENXIO;
    181 	sc = lpt_cd.cd_devs[unit];
    182 	if (!sc)
    183 		return ENXIO;
    184 
    185 #ifdef DIAGNOSTIC
    186 	if (sc->sc_state)
    187 		printf("%s: stat=0x%x not zero\n", sc->sc_dev.dv_xname,
    188 		    sc->sc_state);
    189 #endif
    190 
    191 	if (sc->sc_state)
    192 		return EBUSY;
    193 
    194 	sc->sc_state = LPT_INIT;
    195 	sc->sc_flags = flags;
    196 	lprintf("%s: open: flags=0x%x\n", sc->sc_dev.dv_xname, flags);
    197 
    198 	/* wait till ready (printer running diagnostics) */
    199 	for (spin = 0; NOT_READY(); spin += STEP) {
    200 		if (spin >= TIMEOUT) {
    201 			sc->sc_state = 0;
    202 			return EBUSY;
    203 		}
    204 
    205 		/* wait 1/4 second, give up if we get a signal */
    206 		if ((error = tsleep((caddr_t)sc, LPTPRI | PCATCH, "lptopen",
    207 		     STEP)) != EWOULDBLOCK) {
    208 			sc->sc_state = 0;
    209 			return error;
    210 		}
    211 	}
    212 
    213 	sc->sc_inbuf = geteblk(LPT_BSIZE);
    214 	sc->sc_count = 0;
    215 	sc->sc_state = LPT_OPEN;
    216 
    217 	if ((sc->sc_flags & LPT_NOINTR) == 0) {
    218 		lptwakeup(sc);
    219 
    220 		sps = splhigh();
    221 		MFP->mf_imrb |= IB_PBSY;
    222 		MFP->mf_ierb |= IB_PBSY;
    223 		splx(sps);
    224 	}
    225 
    226 	lprintf("%s: opened\n", sc->sc_dev.dv_xname);
    227 	return 0;
    228 }
    229 
    230 void
    231 lptwakeup(arg)
    232 	void *arg;
    233 {
    234 	struct lpt_softc *sc = arg;
    235 
    236 	lptpseudointr();
    237 
    238 	timeout(lptwakeup, sc, STEP);
    239 }
    240 
    241 /*
    242  * Close the device, and free the local line buffer.
    243  */
    244 int
    245 lptclose(dev, flag, mode, p)
    246 	dev_t		dev;
    247 	int		flag;
    248 	int		mode;
    249 	struct proc	*p;
    250 {
    251 	int		 unit = LPTUNIT(dev);
    252 	struct lpt_softc *sc = lpt_cd.cd_devs[unit];
    253 	int		 sps;
    254 
    255 	if (sc->sc_count)
    256 		(void) pushbytes(sc);
    257 
    258 	if ((sc->sc_flags & LPT_NOINTR) == 0) {
    259 		untimeout(lptwakeup, sc);
    260 
    261 		sps = splhigh();
    262 		MFP->mf_ierb &= ~IB_PBSY;
    263 		MFP->mf_imrb &= ~IB_PBSY;
    264 		splx(sps);
    265 	}
    266 
    267 	sc->sc_state = 0;
    268 	brelse(sc->sc_inbuf);
    269 
    270 	lprintf("%s: closed\n", sc->sc_dev.dv_xname);
    271 	return 0;
    272 }
    273 
    274 int
    275 pushbytes(sc)
    276 	struct lpt_softc *sc;
    277 {
    278 	int	error;
    279 
    280 	if (sc->sc_flags & LPT_NOINTR) {
    281 		int spin, tic;
    282 
    283 		while (sc->sc_count > 0) {
    284 			spin = 0;
    285 			while (NOT_READY()) {
    286 				if (++spin < sc->sc_spinmax)
    287 					continue;
    288 				tic = 0;
    289 				/* adapt busy-wait algorithm */
    290 				sc->sc_spinmax++;
    291 				while (NOT_READY()) {
    292 					/* exponential backoff */
    293 					tic = tic + tic + 1;
    294 					if (tic > TIMEOUT)
    295 						tic = TIMEOUT;
    296 					error = tsleep((caddr_t)sc,
    297 					    LPTPRI | PCATCH, "lptpsh", tic);
    298 					if (error != EWOULDBLOCK)
    299 						return error;
    300 				}
    301 				break;
    302 			}
    303 
    304 			ym2149_write_ioport(YM_IOB, *sc->sc_cp++);
    305 			ym2149_strobe(0);
    306 			sc->sc_count--;
    307 			ym2149_strobe(1);
    308 
    309 			/* adapt busy-wait algorithm */
    310 			if (spin*2 + 16 < sc->sc_spinmax)
    311 				sc->sc_spinmax--;
    312 		}
    313 	} else {
    314 		while (sc->sc_count > 0) {
    315 			/* if the printer is ready for a char, give it one */
    316 			if ((sc->sc_state & LPT_OBUSY) == 0) {
    317 				lprintf("%s: write %d\n", sc->sc_dev.dv_xname,
    318 				    sc->sc_count);
    319 				(void) lptpseudointr();
    320 			}
    321 			if ((error = tsleep((caddr_t)sc, LPTPRI | PCATCH,
    322 			     "lptwrite2", 0)) != 0)
    323 				return error;
    324 		}
    325 	}
    326 	return 0;
    327 }
    328 
    329 /*
    330  * Copy a line from user space to a local buffer, then call putc to get the
    331  * chars moved to the output queue.
    332  */
    333 int
    334 lptwrite(dev, uio, flags)
    335 	dev_t		dev;
    336 	struct uio	*uio;
    337 	int		flags;
    338 {
    339 	struct lpt_softc *sc = lpt_cd.cd_devs[LPTUNIT(dev)];
    340 	size_t n;
    341 	int error = 0;
    342 
    343 	while ((n = min(LPT_BSIZE, uio->uio_resid)) > 0) {
    344 		uiomove(sc->sc_cp = sc->sc_inbuf->b_data, n, uio);
    345 		sc->sc_count = n;
    346 		error = pushbytes(sc);
    347 		if (error) {
    348 			/*
    349 			 * Return accurate residual if interrupted or timed
    350 			 * out.
    351 			 */
    352 			uio->uio_resid += sc->sc_count;
    353 			sc->sc_count = 0;
    354 			return error;
    355 		}
    356 	}
    357 	return 0;
    358 }
    359 
    360 /*
    361  * Handle printer interrupts which occur when the printer is ready to accept
    362  * another char.
    363  */
    364 int
    365 lptintr()
    366 {
    367 	struct lpt_softc *sc;
    368 
    369 	sc = lpt_cd.cd_devs[0]; /* XXX: LWP - we have only one on the Atari */
    370 
    371 	/* is printer online and ready for output */
    372 	if (NOT_READY())
    373 		return 0;
    374 
    375 	if (sc->sc_count) {
    376 
    377 		/* send char */
    378 		ym2149_write_ioport(YM_IOB, *sc->sc_cp++);
    379 		ym2149_strobe(0);
    380 		sc->sc_count--;
    381 		ym2149_strobe(1);
    382 		sc->sc_state |= LPT_OBUSY;
    383 	} else
    384 		sc->sc_state &= ~LPT_OBUSY;
    385 
    386 	if (sc->sc_count == 0) {
    387 		/* none, wake up the top half to get more */
    388 		wakeup((caddr_t)sc);
    389 	}
    390 
    391 	return 1;
    392 }
    393 
    394 static void
    395 lptpseudointr()
    396 {
    397 	int	s;
    398 
    399 	s = spltty();
    400 	lptintr();
    401 	splx(s);
    402 }
    403 
    404 int
    405 lpthwintr(sr)
    406 int	sr;
    407 {
    408 	if (!BASEPRI(sr))
    409 		add_sicallback((si_farg)lptpseudointr, NULL, 0);
    410 	else lptpseudointr();
    411 	return 1;
    412 }
    413 
    414 int
    415 lptioctl(dev, cmd, data, flag, p)
    416 	dev_t		dev;
    417 	u_long		cmd;
    418 	caddr_t		data;
    419 	int		flag;
    420 	struct proc	*p;
    421 {
    422 	int error = 0;
    423 
    424 	switch (cmd) {
    425 	default:
    426 		error = ENODEV;
    427 	}
    428 
    429 	return error;
    430 }
    431