lpt_mvme.c revision 1.15
1 /* $NetBSD: lpt_mvme.c,v 1.15 2009/03/14 15:36:19 dsl 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 1.15 2009/03/14 15:36:19 dsl 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(struct lpt_softc *sc) 140 { 141 142 sc->sc_state = 0; 143 callout_init(&sc->sc_wakeup_ch, 0); 144 } 145 146 /* 147 * Reset the printer, then wait until it's selected and not busy. 148 */ 149 int 150 lptopen(dev_t dev, int flag, int mode, struct lwp *l) 151 { 152 u_char flags; 153 struct lpt_softc *sc; 154 int error; 155 int spin; 156 157 flags = LPTFLAGS(dev); 158 159 sc = device_lookup_private(&lpt_cd, LPTUNIT(dev)); 160 if (!sc) 161 return (ENXIO); 162 163 #ifdef DIAGNOSTIC 164 if (sc->sc_state) 165 aprint_verbose_dev(sc->sc_dev, "stat=0x%x not zero\n", 166 sc->sc_state); 167 #endif 168 169 if (sc->sc_state) 170 return (EBUSY); 171 172 sc->sc_state = LPT_INIT; 173 sc->sc_flags = flags; 174 LPRINTF((sc->sc_dev, "open: flags=0x%x\n", flags)); 175 176 if ((flags & LPT_NOPRIME) == 0) { 177 /* assert Input Prime for 100 usec to start up printer */ 178 (sc->sc_funcs->lf_iprime) (sc); 179 } 180 181 /* select fast or slow strobe depending on minor device number */ 182 if (flags & LPT_FAST_STROBE) 183 (sc->sc_funcs->lf_speed) (sc, LPT_STROBE_FAST); 184 else 185 (sc->sc_funcs->lf_speed) (sc, LPT_STROBE_SLOW); 186 187 /* wait till ready (printer running diagnostics) */ 188 for (spin = 0; (sc->sc_funcs->lf_notrdy) (sc, 1); spin += STEP) { 189 if (spin >= TIMEOUT) { 190 sc->sc_state = 0; 191 return (EBUSY); 192 } 193 /* wait 1/4 second, give up if we get a signal */ 194 error = tsleep((void *) sc, LPTPRI | PCATCH, "lptopen", STEP); 195 if (error != EWOULDBLOCK) { 196 sc->sc_state = 0; 197 return (error); 198 } 199 } 200 201 sc->sc_inbuf = geteblk(LPT_BSIZE); 202 sc->sc_count = 0; 203 sc->sc_state = LPT_OPEN; 204 205 if ((sc->sc_flags & LPT_NOINTR) == 0) 206 lpt_wakeup(sc); 207 208 (sc->sc_funcs->lf_open) (sc, sc->sc_flags & LPT_NOINTR); 209 210 LPRINTF((sc->sc_dev, "opened\n")); 211 return (0); 212 } 213 214 void 215 lpt_wakeup(void *arg) 216 { 217 struct lpt_softc *sc; 218 int s; 219 220 sc = arg; 221 222 s = spltty(); 223 lpt_intr(sc); 224 splx(s); 225 226 callout_reset(&sc->sc_wakeup_ch, STEP, lpt_wakeup, sc); 227 } 228 229 /* 230 * Close the device, and free the local line buffer. 231 */ 232 int 233 lptclose(dev_t dev, int flag, int mode, struct lwp *l) 234 { 235 struct lpt_softc *sc; 236 237 sc = device_lookup_private(&lpt_cd, LPTUNIT(dev)); 238 239 if (sc->sc_count) 240 (void) pushbytes(sc); 241 242 if ((sc->sc_flags & LPT_NOINTR) == 0) 243 callout_stop(&sc->sc_wakeup_ch); 244 245 (sc->sc_funcs->lf_close) (sc); 246 247 sc->sc_state = 0; 248 brelse(sc->sc_inbuf, 0); 249 250 LPRINTF((sc->sc_dev, "%s: closed\n")); 251 return (0); 252 } 253 254 int 255 pushbytes(struct lpt_softc *sc) 256 { 257 int s, error, spin, tic; 258 259 if (sc->sc_flags & LPT_NOINTR) { 260 while (sc->sc_count > 0) { 261 spin = 0; 262 while ((sc->sc_funcs->lf_notrdy) (sc, 0)) { 263 if (++spin < sc->sc_spinmax) 264 continue; 265 tic = 0; 266 /* adapt busy-wait algorithm */ 267 sc->sc_spinmax++; 268 while ((sc->sc_funcs->lf_notrdy) (sc, 1)) { 269 /* exponential backoff */ 270 tic = tic + tic + 1; 271 if (tic > TIMEOUT) 272 tic = TIMEOUT; 273 error = tsleep((void *) sc, 274 LPTPRI | PCATCH, "lptpsh", tic); 275 if (error != EWOULDBLOCK) 276 return (error); 277 } 278 break; 279 } 280 281 (sc->sc_funcs->lf_wrdata) (sc, *sc->sc_cp++); 282 sc->sc_count--; 283 284 /* adapt busy-wait algorithm */ 285 if (spin * 2 + 16 < sc->sc_spinmax) 286 sc->sc_spinmax--; 287 } 288 } else { 289 while (sc->sc_count > 0) { 290 /* if the printer is ready for a char, give it one */ 291 if ((sc->sc_state & LPT_OBUSY) == 0) { 292 LPRINTF((sc->sc_dev, "write %d\n", 293 sc->sc_count)); 294 s = spltty(); 295 (void) lpt_intr(sc); 296 splx(s); 297 } 298 error = tsleep((void *) sc, LPTPRI | PCATCH, 299 "lptwrite2", 0); 300 if (error) 301 return (error); 302 } 303 } 304 return (0); 305 } 306 307 /* 308 * Copy a line from user space to a local buffer, then call putc to get the 309 * chars moved to the output queue. 310 */ 311 int 312 lptwrite(dev_t dev, struct uio *uio, int flags) 313 { 314 struct lpt_softc *sc; 315 size_t n; 316 int error; 317 318 sc = device_lookup_private(&lpt_cd, LPTUNIT(dev)); 319 error = 0; 320 321 while ((n = min(LPT_BSIZE, uio->uio_resid)) != 0) { 322 uiomove(sc->sc_cp = sc->sc_inbuf->b_data, n, uio); 323 sc->sc_count = n; 324 error = pushbytes(sc); 325 if (error) { 326 /* 327 * Return accurate residual if interrupted or timed 328 * out. 329 */ 330 uio->uio_resid += sc->sc_count; 331 sc->sc_count = 0; 332 return (error); 333 } 334 } 335 return (0); 336 } 337 338 /* 339 * Handle printer interrupts which occur when the printer is ready to accept 340 * another char. 341 */ 342 int 343 lpt_intr(struct lpt_softc *sc) 344 { 345 346 if (sc->sc_count) { 347 /* send char */ 348 (sc->sc_funcs->lf_wrdata) (sc, *sc->sc_cp++); 349 sc->sc_count--; 350 sc->sc_state |= LPT_OBUSY; 351 } else 352 sc->sc_state &= ~LPT_OBUSY; 353 354 if (sc->sc_count == 0) { 355 /* none, wake up the top half to get more */ 356 wakeup((void *) sc); 357 } 358 359 return (1); 360 } 361 362 /* ARGSUSED */ 363 int 364 lptioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 365 { 366 367 return (ENODEV); 368 } 369
Indexes created Sun Sep 28 16:09:52 GMT 2025