lpt_mvme.c revision 1.12.4.3
1 /* $NetBSD: lpt_mvme.c,v 1.12.4.3 2010/03/11 15:03:42 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 1.12.4.3 2010/03/11 15:03:42 yamt Exp $"); 88 89 #include <sys/param.h> 90 #include <sys/systm.h> 91 #include <sys/proc.h> 92 #include <sys/buf.h> 93 #include <sys/kernel.h> 94 #include <sys/ioctl.h> 95 #include <sys/uio.h> 96 #include <sys/device.h> 97 #include <sys/conf.h> 98 #include <sys/syslog.h> 99 100 #include <sys/cpu.h> 101 #include <sys/bus.h> 102 103 #include <dev/mvme/lptvar.h> 104 105 106 #define TIMEOUT hz*16 /* wait up to 16 seconds for a ready */ 107 #define STEP hz/4 108 109 #define LPTPRI (PZERO+8) 110 #define LPT_BSIZE 1024 111 112 #if !defined(DEBUG) || !defined(notdef) 113 #define LPRINTF(a) 114 #else 115 #define LPRINTF if (lptdebug) aprint_verbose_dev a 116 int lptdebug = 1; 117 #endif 118 119 #define LPTUNIT(s) (minor(s) & 0x0f) 120 #define LPTFLAGS(s) (minor(s) & 0xf0) 121 122 static void lpt_wakeup(void *arg); 123 static int pushbytes(struct lpt_softc *); 124 125 extern struct cfdriver lpt_cd; 126 127 dev_type_open(lptopen); 128 dev_type_close(lptclose); 129 dev_type_write(lptwrite); 130 dev_type_ioctl(lptioctl); 131 132 const struct cdevsw lpt_cdevsw = { 133 lptopen, lptclose, noread, lptwrite, lptioctl, 134 nostop, notty, nopoll, nommap, nokqfilter, 135 }; 136 137 void 138 lpt_attach_subr(struct lpt_softc *sc) 139 { 140 141 sc->sc_state = 0; 142 callout_init(&sc->sc_wakeup_ch, 0); 143 } 144 145 /* 146 * Reset the printer, then wait until it's selected and not busy. 147 */ 148 int 149 lptopen(dev_t dev, int flag, int mode, struct lwp *l) 150 { 151 u_char flags; 152 struct lpt_softc *sc; 153 int error; 154 int spin; 155 156 flags = LPTFLAGS(dev); 157 158 sc = device_lookup_private(&lpt_cd, LPTUNIT(dev)); 159 if (!sc) 160 return (ENXIO); 161 162 #ifdef DIAGNOSTIC 163 if (sc->sc_state) 164 aprint_verbose_dev(sc->sc_dev, "stat=0x%x not zero\n", 165 sc->sc_state); 166 #endif 167 168 if (sc->sc_state) 169 return (EBUSY); 170 171 sc->sc_state = LPT_INIT; 172 sc->sc_flags = flags; 173 LPRINTF((sc->sc_dev, "open: flags=0x%x\n", flags)); 174 175 if ((flags & LPT_NOPRIME) == 0) { 176 /* assert Input Prime for 100 usec to start up printer */ 177 (sc->sc_funcs->lf_iprime) (sc); 178 } 179 180 /* select fast or slow strobe depending on minor device number */ 181 if (flags & LPT_FAST_STROBE) 182 (sc->sc_funcs->lf_speed) (sc, LPT_STROBE_FAST); 183 else 184 (sc->sc_funcs->lf_speed) (sc, LPT_STROBE_SLOW); 185 186 /* wait till ready (printer running diagnostics) */ 187 for (spin = 0; (sc->sc_funcs->lf_notrdy) (sc, 1); spin += STEP) { 188 if (spin >= TIMEOUT) { 189 sc->sc_state = 0; 190 return (EBUSY); 191 } 192 /* wait 1/4 second, give up if we get a signal */ 193 error = tsleep((void *) sc, LPTPRI | PCATCH, "lptopen", STEP); 194 if (error != EWOULDBLOCK) { 195 sc->sc_state = 0; 196 return (error); 197 } 198 } 199 200 sc->sc_inbuf = geteblk(LPT_BSIZE); 201 sc->sc_count = 0; 202 sc->sc_state = LPT_OPEN; 203 204 if ((sc->sc_flags & LPT_NOINTR) == 0) 205 lpt_wakeup(sc); 206 207 (sc->sc_funcs->lf_open) (sc, sc->sc_flags & LPT_NOINTR); 208 209 LPRINTF((sc->sc_dev, "opened\n")); 210 return (0); 211 } 212 213 void 214 lpt_wakeup(void *arg) 215 { 216 struct lpt_softc *sc; 217 int s; 218 219 sc = arg; 220 221 s = spltty(); 222 lpt_intr(sc); 223 splx(s); 224 225 callout_reset(&sc->sc_wakeup_ch, STEP, lpt_wakeup, sc); 226 } 227 228 /* 229 * Close the device, and free the local line buffer. 230 */ 231 int 232 lptclose(dev_t dev, int flag, int mode, struct lwp *l) 233 { 234 struct lpt_softc *sc; 235 236 sc = device_lookup_private(&lpt_cd, LPTUNIT(dev)); 237 238 if (sc->sc_count) 239 (void) pushbytes(sc); 240 241 if ((sc->sc_flags & LPT_NOINTR) == 0) 242 callout_stop(&sc->sc_wakeup_ch); 243 244 (sc->sc_funcs->lf_close) (sc); 245 246 sc->sc_state = 0; 247 brelse(sc->sc_inbuf, 0); 248 249 LPRINTF((sc->sc_dev, "%s: closed\n")); 250 return (0); 251 } 252 253 int 254 pushbytes(struct lpt_softc *sc) 255 { 256 int s, error, spin, tic; 257 258 if (sc->sc_flags & LPT_NOINTR) { 259 while (sc->sc_count > 0) { 260 spin = 0; 261 while ((sc->sc_funcs->lf_notrdy) (sc, 0)) { 262 if (++spin < sc->sc_spinmax) 263 continue; 264 tic = 0; 265 /* adapt busy-wait algorithm */ 266 sc->sc_spinmax++; 267 while ((sc->sc_funcs->lf_notrdy) (sc, 1)) { 268 /* exponential backoff */ 269 tic = tic + tic + 1; 270 if (tic > TIMEOUT) 271 tic = TIMEOUT; 272 error = tsleep((void *) sc, 273 LPTPRI | PCATCH, "lptpsh", tic); 274 if (error != EWOULDBLOCK) 275 return (error); 276 } 277 break; 278 } 279 280 (sc->sc_funcs->lf_wrdata) (sc, *sc->sc_cp++); 281 sc->sc_count--; 282 283 /* adapt busy-wait algorithm */ 284 if (spin * 2 + 16 < sc->sc_spinmax) 285 sc->sc_spinmax--; 286 } 287 } else { 288 while (sc->sc_count > 0) { 289 /* if the printer is ready for a char, give it one */ 290 if ((sc->sc_state & LPT_OBUSY) == 0) { 291 LPRINTF((sc->sc_dev, "write %d\n", 292 sc->sc_count)); 293 s = spltty(); 294 (void) lpt_intr(sc); 295 splx(s); 296 } 297 error = tsleep((void *) sc, LPTPRI | PCATCH, 298 "lptwrite2", 0); 299 if (error) 300 return (error); 301 } 302 } 303 return (0); 304 } 305 306 /* 307 * Copy a line from user space to a local buffer, then call putc to get the 308 * chars moved to the output queue. 309 */ 310 int 311 lptwrite(dev_t dev, struct uio *uio, int flags) 312 { 313 struct lpt_softc *sc; 314 size_t n; 315 int error; 316 317 sc = device_lookup_private(&lpt_cd, LPTUNIT(dev)); 318 error = 0; 319 320 while ((n = min(LPT_BSIZE, uio->uio_resid)) != 0) { 321 uiomove(sc->sc_cp = sc->sc_inbuf->b_data, n, uio); 322 sc->sc_count = n; 323 error = pushbytes(sc); 324 if (error) { 325 /* 326 * Return accurate residual if interrupted or timed 327 * out. 328 */ 329 uio->uio_resid += sc->sc_count; 330 sc->sc_count = 0; 331 return (error); 332 } 333 } 334 return (0); 335 } 336 337 /* 338 * Handle printer interrupts which occur when the printer is ready to accept 339 * another char. 340 */ 341 int 342 lpt_intr(struct lpt_softc *sc) 343 { 344 345 if (sc->sc_count) { 346 /* send char */ 347 (sc->sc_funcs->lf_wrdata) (sc, *sc->sc_cp++); 348 sc->sc_count--; 349 sc->sc_state |= LPT_OBUSY; 350 } else 351 sc->sc_state &= ~LPT_OBUSY; 352 353 if (sc->sc_count == 0) { 354 /* none, wake up the top half to get more */ 355 wakeup((void *) sc); 356 } 357 358 return (1); 359 } 360 361 /* ARGSUSED */ 362 int 363 lptioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 364 { 365 366 return (ENODEV); 367 } 368
Indexes created Sun Oct 19 19:09:49 GMT 2025