lpt_mvme.c revision 1.12.2.1
1 /* $NetBSD: lpt_mvme.c,v 1.12.2.1 2008/05/18 12:34:13 yamt Exp $ */ 2 3 /*- 4 * Copyright (c) 1999, 2002 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Steve C. Woodford. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Copyright (c) 1993, 1994 Charles M. Hannum. 34 * Copyright (c) 1990 William F. Jolitz, TeleMuse 35 * All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. All advertising materials mentioning features or use of this software 46 * must display the following acknowledgement: 47 * This software is a component of "386BSD" developed by 48 * William F. Jolitz, TeleMuse. 49 * 4. Neither the name of the developer nor the name "386BSD" 50 * may be used to endorse or promote products derived from this software 51 * without specific prior written permission. 52 * 53 * THIS SOFTWARE IS A COMPONENT OF 386BSD DEVELOPED BY WILLIAM F. JOLITZ 54 * AND IS INTENDED FOR RESEARCH AND EDUCATIONAL PURPOSES ONLY. THIS 55 * SOFTWARE SHOULD NOT BE CONSIDERED TO BE A COMMERCIAL PRODUCT. 56 * THE DEVELOPER URGES THAT USERS WHO REQUIRE A COMMERCIAL PRODUCT 57 * NOT MAKE USE OF THIS WORK. 58 * 59 * FOR USERS WHO WISH TO UNDERSTAND THE 386BSD SYSTEM DEVELOPED 60 * BY WILLIAM F. JOLITZ, WE RECOMMEND THE USER STUDY WRITTEN 61 * REFERENCES SUCH AS THE "PORTING UNIX TO THE 386" SERIES 62 * (BEGINNING JANUARY 1991 "DR. DOBBS JOURNAL", USA AND BEGINNING 63 * JUNE 1991 "UNIX MAGAZIN", GERMANY) BY WILLIAM F. JOLITZ AND 64 * LYNNE GREER JOLITZ, AS WELL AS OTHER BOOKS ON UNIX AND THE 65 * ON-LINE 386BSD USER MANUAL BEFORE USE. A BOOK DISCUSSING THE INTERNALS 66 * OF 386BSD ENTITLED "386BSD FROM THE INSIDE OUT" WILL BE AVAILABLE LATE 1992. 67 * 68 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``AS IS'' AND 69 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 70 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 71 * ARE DISCLAIMED. IN NO EVENT SHALL THE DEVELOPER BE LIABLE 72 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 73 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 74 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 75 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 76 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 77 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 78 * SUCH DAMAGE. 79 */ 80 81 /* 82 * Device Driver for an MVME68K/MVME88K board's parallel printer port 83 * This driver attaches above the board-specific back-end. 84 */ 85 86 #include <sys/cdefs.h> 87 __KERNEL_RCSID(0, "$NetBSD: lpt_mvme.c,v 1.12.2.1 2008/05/18 12:34:13 yamt Exp $"); 88 89 #include <sys/param.h> 90 #include <sys/systm.h> 91 #include <sys/proc.h> 92 #include <sys/user.h> 93 #include <sys/buf.h> 94 #include <sys/kernel.h> 95 #include <sys/ioctl.h> 96 #include <sys/uio.h> 97 #include <sys/device.h> 98 #include <sys/conf.h> 99 #include <sys/syslog.h> 100 101 #include <sys/cpu.h> 102 #include <sys/bus.h> 103 104 #include <dev/mvme/lptvar.h> 105 106 107 #define TIMEOUT hz*16 /* wait up to 16 seconds for a ready */ 108 #define STEP hz/4 109 110 #define LPTPRI (PZERO+8) 111 #define LPT_BSIZE 1024 112 113 #if !defined(DEBUG) || !defined(notdef) 114 #define LPRINTF(a) 115 #else 116 #define LPRINTF if (lptdebug) aprint_verbose_dev a 117 int lptdebug = 1; 118 #endif 119 120 #define LPTUNIT(s) (minor(s) & 0x0f) 121 #define LPTFLAGS(s) (minor(s) & 0xf0) 122 123 static void lpt_wakeup(void *arg); 124 static int pushbytes(struct lpt_softc *); 125 126 extern struct cfdriver lpt_cd; 127 128 dev_type_open(lptopen); 129 dev_type_close(lptclose); 130 dev_type_write(lptwrite); 131 dev_type_ioctl(lptioctl); 132 133 const struct cdevsw lpt_cdevsw = { 134 lptopen, lptclose, noread, lptwrite, lptioctl, 135 nostop, notty, nopoll, nommap, nokqfilter, 136 }; 137 138 void 139 lpt_attach_subr(sc) 140 struct lpt_softc *sc; 141 { 142 143 sc->sc_state = 0; 144 callout_init(&sc->sc_wakeup_ch, 0); 145 } 146 147 /* 148 * Reset the printer, then wait until it's selected and not busy. 149 */ 150 int 151 lptopen(dev, flag, mode, l) 152 dev_t dev; 153 int flag; 154 int mode; 155 struct lwp *l; 156 { 157 int unit; 158 u_char flags; 159 struct lpt_softc *sc; 160 int error; 161 int spin; 162 163 unit = LPTUNIT(dev); 164 flags = LPTFLAGS(dev); 165 166 if (unit >= lpt_cd.cd_ndevs) 167 return (ENXIO); 168 sc = device_private(lpt_cd.cd_devs[unit]); 169 if (!sc) 170 return (ENXIO); 171 172 #ifdef DIAGNOSTIC 173 if (sc->sc_state) 174 aprint_verbose_dev(sc->sc_dev, "stat=0x%x not zero\n", 175 sc->sc_state); 176 #endif 177 178 if (sc->sc_state) 179 return (EBUSY); 180 181 sc->sc_state = LPT_INIT; 182 sc->sc_flags = flags; 183 LPRINTF((sc->sc_dev, "open: flags=0x%x\n", flags)); 184 185 if ((flags & LPT_NOPRIME) == 0) { 186 /* assert Input Prime for 100 usec to start up printer */ 187 (sc->sc_funcs->lf_iprime) (sc); 188 } 189 190 /* select fast or slow strobe depending on minor device number */ 191 if (flags & LPT_FAST_STROBE) 192 (sc->sc_funcs->lf_speed) (sc, LPT_STROBE_FAST); 193 else 194 (sc->sc_funcs->lf_speed) (sc, LPT_STROBE_SLOW); 195 196 /* wait till ready (printer running diagnostics) */ 197 for (spin = 0; (sc->sc_funcs->lf_notrdy) (sc, 1); spin += STEP) { 198 if (spin >= TIMEOUT) { 199 sc->sc_state = 0; 200 return (EBUSY); 201 } 202 /* wait 1/4 second, give up if we get a signal */ 203 error = tsleep((void *) sc, LPTPRI | PCATCH, "lptopen", STEP); 204 if (error != EWOULDBLOCK) { 205 sc->sc_state = 0; 206 return (error); 207 } 208 } 209 210 sc->sc_inbuf = geteblk(LPT_BSIZE); 211 sc->sc_count = 0; 212 sc->sc_state = LPT_OPEN; 213 214 if ((sc->sc_flags & LPT_NOINTR) == 0) 215 lpt_wakeup(sc); 216 217 (sc->sc_funcs->lf_open) (sc, sc->sc_flags & LPT_NOINTR); 218 219 LPRINTF((sc->sc_dev, "opened\n")); 220 return (0); 221 } 222 223 void 224 lpt_wakeup(arg) 225 void *arg; 226 { 227 struct lpt_softc *sc; 228 int s; 229 230 sc = arg; 231 232 s = spltty(); 233 lpt_intr(sc); 234 splx(s); 235 236 callout_reset(&sc->sc_wakeup_ch, STEP, lpt_wakeup, sc); 237 } 238 239 /* 240 * Close the device, and free the local line buffer. 241 */ 242 int 243 lptclose(dev, flag, mode, l) 244 dev_t dev; 245 int flag; 246 int mode; 247 struct lwp *l; 248 { 249 struct lpt_softc *sc; 250 int unit; 251 252 unit = LPTUNIT(dev); 253 sc = device_private(lpt_cd.cd_devs[unit]); 254 255 if (sc->sc_count) 256 (void) pushbytes(sc); 257 258 if ((sc->sc_flags & LPT_NOINTR) == 0) 259 callout_stop(&sc->sc_wakeup_ch); 260 261 (sc->sc_funcs->lf_close) (sc); 262 263 sc->sc_state = 0; 264 brelse(sc->sc_inbuf, 0); 265 266 LPRINTF((sc->sc_dev, "%s: closed\n")); 267 return (0); 268 } 269 270 int 271 pushbytes(sc) 272 struct lpt_softc *sc; 273 { 274 int s, error, spin, tic; 275 276 if (sc->sc_flags & LPT_NOINTR) { 277 while (sc->sc_count > 0) { 278 spin = 0; 279 while ((sc->sc_funcs->lf_notrdy) (sc, 0)) { 280 if (++spin < sc->sc_spinmax) 281 continue; 282 tic = 0; 283 /* adapt busy-wait algorithm */ 284 sc->sc_spinmax++; 285 while ((sc->sc_funcs->lf_notrdy) (sc, 1)) { 286 /* exponential backoff */ 287 tic = tic + tic + 1; 288 if (tic > TIMEOUT) 289 tic = TIMEOUT; 290 error = tsleep((void *) sc, 291 LPTPRI | PCATCH, "lptpsh", tic); 292 if (error != EWOULDBLOCK) 293 return (error); 294 } 295 break; 296 } 297 298 (sc->sc_funcs->lf_wrdata) (sc, *sc->sc_cp++); 299 sc->sc_count--; 300 301 /* adapt busy-wait algorithm */ 302 if (spin * 2 + 16 < sc->sc_spinmax) 303 sc->sc_spinmax--; 304 } 305 } else { 306 while (sc->sc_count > 0) { 307 /* if the printer is ready for a char, give it one */ 308 if ((sc->sc_state & LPT_OBUSY) == 0) { 309 LPRINTF((sc->sc_dev, "write %d\n", 310 sc->sc_count)); 311 s = spltty(); 312 (void) lpt_intr(sc); 313 splx(s); 314 } 315 error = tsleep((void *) sc, LPTPRI | PCATCH, 316 "lptwrite2", 0); 317 if (error) 318 return (error); 319 } 320 } 321 return (0); 322 } 323 324 /* 325 * Copy a line from user space to a local buffer, then call putc to get the 326 * chars moved to the output queue. 327 */ 328 int 329 lptwrite(dev, uio, flags) 330 dev_t dev; 331 struct uio *uio; 332 int flags; 333 { 334 struct lpt_softc *sc; 335 size_t n; 336 int error; 337 338 sc = device_private(lpt_cd.cd_devs[LPTUNIT(dev)]); 339 error = 0; 340 341 while ((n = min(LPT_BSIZE, uio->uio_resid)) != 0) { 342 uiomove(sc->sc_cp = sc->sc_inbuf->b_data, n, uio); 343 sc->sc_count = n; 344 error = pushbytes(sc); 345 if (error) { 346 /* 347 * Return accurate residual if interrupted or timed 348 * out. 349 */ 350 uio->uio_resid += sc->sc_count; 351 sc->sc_count = 0; 352 return (error); 353 } 354 } 355 return (0); 356 } 357 358 /* 359 * Handle printer interrupts which occur when the printer is ready to accept 360 * another char. 361 */ 362 int 363 lpt_intr(sc) 364 struct lpt_softc *sc; 365 { 366 367 if (sc->sc_count) { 368 /* send char */ 369 (sc->sc_funcs->lf_wrdata) (sc, *sc->sc_cp++); 370 sc->sc_count--; 371 sc->sc_state |= LPT_OBUSY; 372 } else 373 sc->sc_state &= ~LPT_OBUSY; 374 375 if (sc->sc_count == 0) { 376 /* none, wake up the top half to get more */ 377 wakeup((void *) sc); 378 } 379 380 return (1); 381 } 382 383 /* ARGSUSED */ 384 int 385 lptioctl(dev, cmd, data, flag, l) 386 dev_t dev; 387 u_long cmd; 388 void *data; 389 int flag; 390 struct lwp *l; 391 { 392 393 return (ENODEV); 394 } 395
Indexes created Sun Oct 19 19:09:49 GMT 2025