lpt_mvme.c revision 1.14
1 /* $NetBSD: lpt_mvme.c,v 1.14 2008/06/12 22:45:46 cegger 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 1.14 2008/06/12 22:45:46 cegger 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_t dev, int flag, int mode, struct lwp *l) 152 { 153 u_char flags; 154 struct lpt_softc *sc; 155 int error; 156 int spin; 157 158 flags = LPTFLAGS(dev); 159 160 sc = device_lookup_private(&lpt_cd, LPTUNIT(dev)); 161 if (!sc) 162 return (ENXIO); 163 164 #ifdef DIAGNOSTIC 165 if (sc->sc_state) 166 aprint_verbose_dev(sc->sc_dev, "stat=0x%x not zero\n", 167 sc->sc_state); 168 #endif 169 170 if (sc->sc_state) 171 return (EBUSY); 172 173 sc->sc_state = LPT_INIT; 174 sc->sc_flags = flags; 175 LPRINTF((sc->sc_dev, "open: flags=0x%x\n", flags)); 176 177 if ((flags & LPT_NOPRIME) == 0) { 178 /* assert Input Prime for 100 usec to start up printer */ 179 (sc->sc_funcs->lf_iprime) (sc); 180 } 181 182 /* select fast or slow strobe depending on minor device number */ 183 if (flags & LPT_FAST_STROBE) 184 (sc->sc_funcs->lf_speed) (sc, LPT_STROBE_FAST); 185 else 186 (sc->sc_funcs->lf_speed) (sc, LPT_STROBE_SLOW); 187 188 /* wait till ready (printer running diagnostics) */ 189 for (spin = 0; (sc->sc_funcs->lf_notrdy) (sc, 1); spin += STEP) { 190 if (spin >= TIMEOUT) { 191 sc->sc_state = 0; 192 return (EBUSY); 193 } 194 /* wait 1/4 second, give up if we get a signal */ 195 error = tsleep((void *) sc, LPTPRI | PCATCH, "lptopen", STEP); 196 if (error != EWOULDBLOCK) { 197 sc->sc_state = 0; 198 return (error); 199 } 200 } 201 202 sc->sc_inbuf = geteblk(LPT_BSIZE); 203 sc->sc_count = 0; 204 sc->sc_state = LPT_OPEN; 205 206 if ((sc->sc_flags & LPT_NOINTR) == 0) 207 lpt_wakeup(sc); 208 209 (sc->sc_funcs->lf_open) (sc, sc->sc_flags & LPT_NOINTR); 210 211 LPRINTF((sc->sc_dev, "opened\n")); 212 return (0); 213 } 214 215 void 216 lpt_wakeup(arg) 217 void *arg; 218 { 219 struct lpt_softc *sc; 220 int s; 221 222 sc = arg; 223 224 s = spltty(); 225 lpt_intr(sc); 226 splx(s); 227 228 callout_reset(&sc->sc_wakeup_ch, STEP, lpt_wakeup, sc); 229 } 230 231 /* 232 * Close the device, and free the local line buffer. 233 */ 234 int 235 lptclose(dev_t dev, int flag, int mode, struct lwp *l) 236 { 237 struct lpt_softc *sc; 238 239 sc = device_lookup_private(&lpt_cd, LPTUNIT(dev)); 240 241 if (sc->sc_count) 242 (void) pushbytes(sc); 243 244 if ((sc->sc_flags & LPT_NOINTR) == 0) 245 callout_stop(&sc->sc_wakeup_ch); 246 247 (sc->sc_funcs->lf_close) (sc); 248 249 sc->sc_state = 0; 250 brelse(sc->sc_inbuf, 0); 251 252 LPRINTF((sc->sc_dev, "%s: closed\n")); 253 return (0); 254 } 255 256 int 257 pushbytes(sc) 258 struct lpt_softc *sc; 259 { 260 int s, error, spin, tic; 261 262 if (sc->sc_flags & LPT_NOINTR) { 263 while (sc->sc_count > 0) { 264 spin = 0; 265 while ((sc->sc_funcs->lf_notrdy) (sc, 0)) { 266 if (++spin < sc->sc_spinmax) 267 continue; 268 tic = 0; 269 /* adapt busy-wait algorithm */ 270 sc->sc_spinmax++; 271 while ((sc->sc_funcs->lf_notrdy) (sc, 1)) { 272 /* exponential backoff */ 273 tic = tic + tic + 1; 274 if (tic > TIMEOUT) 275 tic = TIMEOUT; 276 error = tsleep((void *) sc, 277 LPTPRI | PCATCH, "lptpsh", tic); 278 if (error != EWOULDBLOCK) 279 return (error); 280 } 281 break; 282 } 283 284 (sc->sc_funcs->lf_wrdata) (sc, *sc->sc_cp++); 285 sc->sc_count--; 286 287 /* adapt busy-wait algorithm */ 288 if (spin * 2 + 16 < sc->sc_spinmax) 289 sc->sc_spinmax--; 290 } 291 } else { 292 while (sc->sc_count > 0) { 293 /* if the printer is ready for a char, give it one */ 294 if ((sc->sc_state & LPT_OBUSY) == 0) { 295 LPRINTF((sc->sc_dev, "write %d\n", 296 sc->sc_count)); 297 s = spltty(); 298 (void) lpt_intr(sc); 299 splx(s); 300 } 301 error = tsleep((void *) sc, LPTPRI | PCATCH, 302 "lptwrite2", 0); 303 if (error) 304 return (error); 305 } 306 } 307 return (0); 308 } 309 310 /* 311 * Copy a line from user space to a local buffer, then call putc to get the 312 * chars moved to the output queue. 313 */ 314 int 315 lptwrite(dev_t dev, struct uio *uio, int flags) 316 { 317 struct lpt_softc *sc; 318 size_t n; 319 int error; 320 321 sc = device_lookup_private(&lpt_cd, LPTUNIT(dev)); 322 error = 0; 323 324 while ((n = min(LPT_BSIZE, uio->uio_resid)) != 0) { 325 uiomove(sc->sc_cp = sc->sc_inbuf->b_data, n, uio); 326 sc->sc_count = n; 327 error = pushbytes(sc); 328 if (error) { 329 /* 330 * Return accurate residual if interrupted or timed 331 * out. 332 */ 333 uio->uio_resid += sc->sc_count; 334 sc->sc_count = 0; 335 return (error); 336 } 337 } 338 return (0); 339 } 340 341 /* 342 * Handle printer interrupts which occur when the printer is ready to accept 343 * another char. 344 */ 345 int 346 lpt_intr(sc) 347 struct lpt_softc *sc; 348 { 349 350 if (sc->sc_count) { 351 /* send char */ 352 (sc->sc_funcs->lf_wrdata) (sc, *sc->sc_cp++); 353 sc->sc_count--; 354 sc->sc_state |= LPT_OBUSY; 355 } else 356 sc->sc_state &= ~LPT_OBUSY; 357 358 if (sc->sc_count == 0) { 359 /* none, wake up the top half to get more */ 360 wakeup((void *) sc); 361 } 362 363 return (1); 364 } 365 366 /* ARGSUSED */ 367 int 368 lptioctl(dev, cmd, data, flag, l) 369 dev_t dev; 370 u_long cmd; 371 void *data; 372 int flag; 373 struct lwp *l; 374 { 375 376 return (ENODEV); 377 } 378
Indexes created Sat Sep 27 22:09:54 GMT 2025