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lpt.c revision 1.3 
      1 /*	$NetBSD: lpt.c,v 1.3 1996/05/14 10:25:01 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 
    117 int lptintr __P((void));
    118 
    119 /*
    120  * Autoconfig stuff
    121  */
    122 static void lptattach __P((struct device *, struct device *, void *));
    123 static int  lptmatch __P((struct device *, void *, void *));
    124 
    125 struct cfattach lpt_ca = {
    126 	sizeof(struct lpt_softc), lptmatch, lptattach
    127 };
    128 
    129 struct cfdriver lpt_cd = {
    130 	NULL, "lpt", DV_DULL, NULL, 0
    131 };
    132 
    133 /*ARGSUSED*/
    134 static	int
    135 lptmatch(pdp, match, auxp)
    136 struct	device *pdp;
    137 void	*match, *auxp;
    138 {
    139 	struct cfdata *cfp = match;
    140 
    141 	if (!strcmp((char *)auxp, "*") && cfp->cf_unit == 0)
    142 		return (1);
    143 	return (0);
    144 }
    145 
    146 /*ARGSUSED*/
    147 static void
    148 lptattach(pdp, dp, auxp)
    149 struct	device *pdp, *dp;
    150 void	*auxp;
    151 {
    152 	struct lpt_softc *sc = (void *)dp;
    153 
    154 	sc->sc_state = 0;
    155 
    156 	ym2149_strobe(1);
    157 
    158 	printf("\n");
    159 }
    160 
    161 /*
    162  * Reset the printer, then wait until it's selected and not busy.
    163  */
    164 int
    165 lptopen(dev, flag, mode, p)
    166 	dev_t		dev;
    167 	int		flag, mode;
    168 	struct proc	*p;
    169 {
    170 	int			unit = LPTUNIT(dev);
    171 	u_char			flags = LPTFLAGS(dev);
    172 	struct lpt_softc	*sc;
    173 	int 			error;
    174 	int			spin;
    175 	int			sps;
    176 
    177 	if (unit >= lpt_cd.cd_ndevs)
    178 		return ENXIO;
    179 	sc = lpt_cd.cd_devs[unit];
    180 	if (!sc)
    181 		return ENXIO;
    182 
    183 #ifdef DIAGNOSTIC
    184 	if (sc->sc_state)
    185 		printf("%s: stat=0x%x not zero\n", sc->sc_dev.dv_xname,
    186 		    sc->sc_state);
    187 #endif
    188 
    189 	if (sc->sc_state)
    190 		return EBUSY;
    191 
    192 	sc->sc_state = LPT_INIT;
    193 	sc->sc_flags = flags;
    194 	lprintf("%s: open: flags=0x%x\n", sc->sc_dev.dv_xname, flags);
    195 
    196 	/* wait till ready (printer running diagnostics) */
    197 	for (spin = 0; NOT_READY(); spin += STEP) {
    198 		if (spin >= TIMEOUT) {
    199 			sc->sc_state = 0;
    200 			return EBUSY;
    201 		}
    202 
    203 		/* wait 1/4 second, give up if we get a signal */
    204 		if ((error = tsleep((caddr_t)sc, LPTPRI | PCATCH, "lptopen",
    205 		     STEP)) != EWOULDBLOCK) {
    206 			sc->sc_state = 0;
    207 			return error;
    208 		}
    209 	}
    210 
    211 	sc->sc_inbuf = geteblk(LPT_BSIZE);
    212 	sc->sc_count = 0;
    213 	sc->sc_state = LPT_OPEN;
    214 
    215 	if ((sc->sc_flags & LPT_NOINTR) == 0) {
    216 		lptwakeup(sc);
    217 
    218 		sps = splhigh();
    219 		MFP->mf_imrb |= IB_PBSY;
    220 		MFP->mf_ierb |= IB_PBSY;
    221 		splx(sps);
    222 	}
    223 
    224 	lprintf("%s: opened\n", sc->sc_dev.dv_xname);
    225 	return 0;
    226 }
    227 
    228 void
    229 lptwakeup(arg)
    230 	void *arg;
    231 {
    232 	struct lpt_softc *sc = arg;
    233 	int s;
    234 
    235 	s = spltty();
    236 	lptintr();
    237 	splx(s);
    238 
    239 	timeout(lptwakeup, sc, STEP);
    240 }
    241 
    242 /*
    243  * Close the device, and free the local line buffer.
    244  */
    245 int
    246 lptclose(dev, flag, mode, p)
    247 	dev_t		dev;
    248 	int		flag;
    249 	int		mode;
    250 	struct proc	*p;
    251 {
    252 	int		 unit = LPTUNIT(dev);
    253 	struct lpt_softc *sc = lpt_cd.cd_devs[unit];
    254 	int		 sps;
    255 
    256 	if (sc->sc_count)
    257 		(void) pushbytes(sc);
    258 
    259 	if ((sc->sc_flags & LPT_NOINTR) == 0) {
    260 		untimeout(lptwakeup, sc);
    261 
    262 		sps = splhigh();
    263 		MFP->mf_ierb &= ~IB_PBSY;
    264 		MFP->mf_imrb &= ~IB_PBSY;
    265 		splx(sps);
    266 	}
    267 
    268 	sc->sc_state = 0;
    269 	brelse(sc->sc_inbuf);
    270 
    271 	lprintf("%s: closed\n", sc->sc_dev.dv_xname);
    272 	return 0;
    273 }
    274 
    275 int
    276 pushbytes(sc)
    277 	struct lpt_softc *sc;
    278 {
    279 	int	error;
    280 
    281 	if (sc->sc_flags & LPT_NOINTR) {
    282 		int spin, tic;
    283 
    284 		while (sc->sc_count > 0) {
    285 			spin = 0;
    286 			while (NOT_READY()) {
    287 				if (++spin < sc->sc_spinmax)
    288 					continue;
    289 				tic = 0;
    290 				/* adapt busy-wait algorithm */
    291 				sc->sc_spinmax++;
    292 				while (NOT_READY()) {
    293 					/* exponential backoff */
    294 					tic = tic + tic + 1;
    295 					if (tic > TIMEOUT)
    296 						tic = TIMEOUT;
    297 					error = tsleep((caddr_t)sc,
    298 					    LPTPRI | PCATCH, "lptpsh", tic);
    299 					if (error != EWOULDBLOCK)
    300 						return error;
    301 				}
    302 				break;
    303 			}
    304 
    305 			ym2149_write_ioport(YM_IOB, *sc->sc_cp++);
    306 			ym2149_strobe(0);
    307 			sc->sc_count--;
    308 			ym2149_strobe(1);
    309 
    310 			/* adapt busy-wait algorithm */
    311 			if (spin*2 + 16 < sc->sc_spinmax)
    312 				sc->sc_spinmax--;
    313 		}
    314 	} else {
    315 		int s;
    316 
    317 		while (sc->sc_count > 0) {
    318 			/* if the printer is ready for a char, give it one */
    319 			if ((sc->sc_state & LPT_OBUSY) == 0) {
    320 				lprintf("%s: write %d\n", sc->sc_dev.dv_xname,
    321 				    sc->sc_count);
    322 				s = spltty();
    323 				(void) lptintr();
    324 				splx(s);
    325 			}
    326 			if ((error = tsleep((caddr_t)sc, LPTPRI | PCATCH,
    327 			     "lptwrite2", 0)) != 0)
    328 				return error;
    329 		}
    330 	}
    331 	return 0;
    332 }
    333 
    334 /*
    335  * Copy a line from user space to a local buffer, then call putc to get the
    336  * chars moved to the output queue.
    337  */
    338 int
    339 lptwrite(dev, uio, flags)
    340 	dev_t		dev;
    341 	struct uio	*uio;
    342 	int		flags;
    343 {
    344 	struct lpt_softc *sc = lpt_cd.cd_devs[LPTUNIT(dev)];
    345 	size_t n;
    346 	int error = 0;
    347 
    348 	while ((n = min(LPT_BSIZE, uio->uio_resid)) > 0) {
    349 		uiomove(sc->sc_cp = sc->sc_inbuf->b_data, n, uio);
    350 		sc->sc_count = n;
    351 		error = pushbytes(sc);
    352 		if (error) {
    353 			/*
    354 			 * Return accurate residual if interrupted or timed
    355 			 * out.
    356 			 */
    357 			uio->uio_resid += sc->sc_count;
    358 			sc->sc_count = 0;
    359 			return error;
    360 		}
    361 	}
    362 	return 0;
    363 }
    364 
    365 /*
    366  * Handle printer interrupts which occur when the printer is ready to accept
    367  * another char.
    368  */
    369 int
    370 lptintr()
    371 {
    372 	struct lpt_softc *sc;
    373 
    374 	sc = lpt_cd.cd_devs[0]; /* XXX: LWP - we have only one on the Atari */
    375 
    376 	/* is printer online and ready for output */
    377 	if (NOT_READY())
    378 		return 0;
    379 
    380 	if (sc->sc_count) {
    381 
    382 		/* send char */
    383 		ym2149_write_ioport(YM_IOB, *sc->sc_cp++);
    384 		ym2149_strobe(0);
    385 		sc->sc_count--;
    386 		ym2149_strobe(1);
    387 		sc->sc_state |= LPT_OBUSY;
    388 	} else
    389 		sc->sc_state &= ~LPT_OBUSY;
    390 
    391 	if (sc->sc_count == 0) {
    392 		/* none, wake up the top half to get more */
    393 		wakeup((caddr_t)sc);
    394 	}
    395 
    396 	return 1;
    397 }
    398 
    399 int
    400 lptioctl(dev, cmd, data, flag, p)
    401 	dev_t		dev;
    402 	u_long		cmd;
    403 	caddr_t		data;
    404 	int		flag;
    405 	struct proc	*p;
    406 {
    407 	int error = 0;
    408 
    409 	switch (cmd) {
    410 	default:
    411 		error = ENODEV;
    412 	}
    413 
    414 	return error;
    415 }
    416