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lpt.c revision 1.2 
      1 /*	$NetBSD: lpt.c,v 1.2 1996/04/18 08:52:07 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 printf("ierb: %x, imrb:%x aer: %x, iprb: %x\n", MFP->mf_ierb,MFP->mf_imrb,
    226 			MFP->mf_aer, MFP->mf_iprb);
    227 	return 0;
    228 }
    229 
    230 void
    231 lptwakeup(arg)
    232 	void *arg;
    233 {
    234 	struct lpt_softc *sc = arg;
    235 	int s;
    236 
    237 	s = spltty();
    238 	lptintr();
    239 	splx(s);
    240 
    241 	timeout(lptwakeup, sc, STEP);
    242 }
    243 
    244 /*
    245  * Close the device, and free the local line buffer.
    246  */
    247 int
    248 lptclose(dev, flag, mode, p)
    249 	dev_t		dev;
    250 	int		flag;
    251 	int		mode;
    252 	struct proc	*p;
    253 {
    254 	int		 unit = LPTUNIT(dev);
    255 	struct lpt_softc *sc = lpt_cd.cd_devs[unit];
    256 	int		 sps;
    257 
    258 	if (sc->sc_count)
    259 		(void) pushbytes(sc);
    260 
    261 	if ((sc->sc_flags & LPT_NOINTR) == 0) {
    262 		untimeout(lptwakeup, sc);
    263 
    264 		sps = splhigh();
    265 		MFP->mf_ierb &= ~IB_PBSY;
    266 		MFP->mf_imrb &= ~IB_PBSY;
    267 		splx(sps);
    268 	}
    269 
    270 	sc->sc_state = 0;
    271 	brelse(sc->sc_inbuf);
    272 
    273 	lprintf("%s: closed\n", sc->sc_dev.dv_xname);
    274 	return 0;
    275 }
    276 
    277 int
    278 pushbytes(sc)
    279 	struct lpt_softc *sc;
    280 {
    281 	int	error;
    282 
    283 	if (sc->sc_flags & LPT_NOINTR) {
    284 		int spin, tic;
    285 
    286 		while (sc->sc_count > 0) {
    287 			spin = 0;
    288 			while (NOT_READY()) {
    289 				if (++spin < sc->sc_spinmax)
    290 					continue;
    291 				tic = 0;
    292 				/* adapt busy-wait algorithm */
    293 				sc->sc_spinmax++;
    294 				while (NOT_READY()) {
    295 					/* exponential backoff */
    296 					tic = tic + tic + 1;
    297 					if (tic > TIMEOUT)
    298 						tic = TIMEOUT;
    299 					error = tsleep((caddr_t)sc,
    300 					    LPTPRI | PCATCH, "lptpsh", tic);
    301 					if (error != EWOULDBLOCK)
    302 						return error;
    303 				}
    304 				break;
    305 			}
    306 
    307 			ym2149_write_ioport(YM_IOB, *sc->sc_cp++);
    308 			ym2149_strobe(0);
    309 			sc->sc_count--;
    310 			ym2149_strobe(1);
    311 
    312 			/* adapt busy-wait algorithm */
    313 			if (spin*2 + 16 < sc->sc_spinmax)
    314 				sc->sc_spinmax--;
    315 		}
    316 	} else {
    317 		int s;
    318 
    319 		while (sc->sc_count > 0) {
    320 			/* if the printer is ready for a char, give it one */
    321 			if ((sc->sc_state & LPT_OBUSY) == 0) {
    322 				lprintf("%s: write %d\n", sc->sc_dev.dv_xname,
    323 				    sc->sc_count);
    324 				s = spltty();
    325 				(void) lptintr();
    326 				splx(s);
    327 			}
    328 			if ((error = tsleep((caddr_t)sc, LPTPRI | PCATCH,
    329 			     "lptwrite2", 0)) != 0)
    330 				return error;
    331 		}
    332 	}
    333 	return 0;
    334 }
    335 
    336 /*
    337  * Copy a line from user space to a local buffer, then call putc to get the
    338  * chars moved to the output queue.
    339  */
    340 int
    341 lptwrite(dev, uio, flags)
    342 	dev_t		dev;
    343 	struct uio	*uio;
    344 	int		flags;
    345 {
    346 	struct lpt_softc *sc = lpt_cd.cd_devs[LPTUNIT(dev)];
    347 	size_t n;
    348 	int error = 0;
    349 
    350 	while ((n = min(LPT_BSIZE, uio->uio_resid)) > 0) {
    351 		uiomove(sc->sc_cp = sc->sc_inbuf->b_data, n, uio);
    352 		sc->sc_count = n;
    353 		error = pushbytes(sc);
    354 		if (error) {
    355 			/*
    356 			 * Return accurate residual if interrupted or timed
    357 			 * out.
    358 			 */
    359 			uio->uio_resid += sc->sc_count;
    360 			sc->sc_count = 0;
    361 			return error;
    362 		}
    363 	}
    364 	return 0;
    365 }
    366 
    367 /*
    368  * Handle printer interrupts which occur when the printer is ready to accept
    369  * another char.
    370  */
    371 int
    372 lptintr()
    373 {
    374 	struct lpt_softc *sc;
    375 
    376 	sc = lpt_cd.cd_devs[0]; /* XXX: LWP - we have only one on the Atari */
    377 
    378 	/* is printer online and ready for output */
    379 	if (NOT_READY())
    380 		return 0;
    381 
    382 	if (sc->sc_count) {
    383 
    384 		/* send char */
    385 		ym2149_write_ioport(YM_IOB, *sc->sc_cp++);
    386 		ym2149_strobe(0);
    387 		sc->sc_count--;
    388 		ym2149_strobe(1);
    389 		sc->sc_state |= LPT_OBUSY;
    390 	} else
    391 		sc->sc_state &= ~LPT_OBUSY;
    392 
    393 	if (sc->sc_count == 0) {
    394 		/* none, wake up the top half to get more */
    395 		wakeup((caddr_t)sc);
    396 	}
    397 
    398 	return 1;
    399 }
    400 
    401 int
    402 lptioctl(dev, cmd, data, flag, p)
    403 	dev_t		dev;
    404 	u_long		cmd;
    405 	caddr_t		data;
    406 	int		flag;
    407 	struct proc	*p;
    408 {
    409 	int error = 0;
    410 
    411 	switch (cmd) {
    412 	default:
    413 		error = ENODEV;
    414 	}
    415 
    416 	return error;
    417 }
    418