lpt_mvme.c revision 1.17
1 /* $NetBSD: lpt_mvme.c,v 1.17 2014/03/16 05:20:28 dholland 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 1.17 2014/03/16 05:20:28 dholland 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 .d_open = lptopen, 134 .d_close = lptclose, 135 .d_read = noread, 136 .d_write = lptwrite, 137 .d_ioctl = lptioctl, 138 .d_stop = nostop, 139 .d_tty = notty, 140 .d_poll = nopoll, 141 .d_mmap = nommap, 142 .d_kqfilter = nokqfilter, 143 .d_flag = 0 144 }; 145 146 void 147 lpt_attach_subr(struct lpt_softc *sc) 148 { 149 150 sc->sc_state = 0; 151 callout_init(&sc->sc_wakeup_ch, 0); 152 } 153 154 /* 155 * Reset the printer, then wait until it's selected and not busy. 156 */ 157 int 158 lptopen(dev_t dev, int flag, int mode, struct lwp *l) 159 { 160 u_char flags; 161 struct lpt_softc *sc; 162 int error; 163 int spin; 164 165 flags = LPTFLAGS(dev); 166 167 sc = device_lookup_private(&lpt_cd, LPTUNIT(dev)); 168 if (!sc) 169 return (ENXIO); 170 171 #ifdef DIAGNOSTIC 172 if (sc->sc_state) 173 aprint_verbose_dev(sc->sc_dev, "stat=0x%x not zero\n", 174 sc->sc_state); 175 #endif 176 177 if (sc->sc_state) 178 return (EBUSY); 179 180 sc->sc_state = LPT_INIT; 181 sc->sc_flags = flags; 182 LPRINTF((sc->sc_dev, "open: flags=0x%x\n", flags)); 183 184 if ((flags & LPT_NOPRIME) == 0) { 185 /* assert Input Prime for 100 usec to start up printer */ 186 (sc->sc_funcs->lf_iprime) (sc); 187 } 188 189 /* select fast or slow strobe depending on minor device number */ 190 if (flags & LPT_FAST_STROBE) 191 (sc->sc_funcs->lf_speed) (sc, LPT_STROBE_FAST); 192 else 193 (sc->sc_funcs->lf_speed) (sc, LPT_STROBE_SLOW); 194 195 /* wait till ready (printer running diagnostics) */ 196 for (spin = 0; (sc->sc_funcs->lf_notrdy) (sc, 1); spin += STEP) { 197 if (spin >= TIMEOUT) { 198 sc->sc_state = 0; 199 return (EBUSY); 200 } 201 /* wait 1/4 second, give up if we get a signal */ 202 error = tsleep((void *) sc, LPTPRI | PCATCH, "lptopen", STEP); 203 if (error != EWOULDBLOCK) { 204 sc->sc_state = 0; 205 return (error); 206 } 207 } 208 209 sc->sc_inbuf = geteblk(LPT_BSIZE); 210 sc->sc_count = 0; 211 sc->sc_state = LPT_OPEN; 212 213 if ((sc->sc_flags & LPT_NOINTR) == 0) 214 lpt_wakeup(sc); 215 216 (sc->sc_funcs->lf_open) (sc, sc->sc_flags & LPT_NOINTR); 217 218 LPRINTF((sc->sc_dev, "opened\n")); 219 return (0); 220 } 221 222 void 223 lpt_wakeup(void *arg) 224 { 225 struct lpt_softc *sc; 226 int s; 227 228 sc = arg; 229 230 s = spltty(); 231 lpt_intr(sc); 232 splx(s); 233 234 callout_reset(&sc->sc_wakeup_ch, STEP, lpt_wakeup, sc); 235 } 236 237 /* 238 * Close the device, and free the local line buffer. 239 */ 240 int 241 lptclose(dev_t dev, int flag, int mode, struct lwp *l) 242 { 243 struct lpt_softc *sc; 244 245 sc = device_lookup_private(&lpt_cd, LPTUNIT(dev)); 246 247 if (sc->sc_count) 248 (void) pushbytes(sc); 249 250 if ((sc->sc_flags & LPT_NOINTR) == 0) 251 callout_stop(&sc->sc_wakeup_ch); 252 253 (sc->sc_funcs->lf_close) (sc); 254 255 sc->sc_state = 0; 256 brelse(sc->sc_inbuf, 0); 257 258 LPRINTF((sc->sc_dev, "%s: closed\n")); 259 return (0); 260 } 261 262 int 263 pushbytes(struct lpt_softc *sc) 264 { 265 int s, error, spin, tic; 266 267 if (sc->sc_flags & LPT_NOINTR) { 268 while (sc->sc_count > 0) { 269 spin = 0; 270 while ((sc->sc_funcs->lf_notrdy) (sc, 0)) { 271 if (++spin < sc->sc_spinmax) 272 continue; 273 tic = 0; 274 /* adapt busy-wait algorithm */ 275 sc->sc_spinmax++; 276 while ((sc->sc_funcs->lf_notrdy) (sc, 1)) { 277 /* exponential backoff */ 278 tic = tic + tic + 1; 279 if (tic > TIMEOUT) 280 tic = TIMEOUT; 281 error = tsleep((void *) sc, 282 LPTPRI | PCATCH, "lptpsh", tic); 283 if (error != EWOULDBLOCK) 284 return (error); 285 } 286 break; 287 } 288 289 (sc->sc_funcs->lf_wrdata) (sc, *sc->sc_cp++); 290 sc->sc_count--; 291 292 /* adapt busy-wait algorithm */ 293 if (spin * 2 + 16 < sc->sc_spinmax) 294 sc->sc_spinmax--; 295 } 296 } else { 297 while (sc->sc_count > 0) { 298 /* if the printer is ready for a char, give it one */ 299 if ((sc->sc_state & LPT_OBUSY) == 0) { 300 LPRINTF((sc->sc_dev, "write %d\n", 301 sc->sc_count)); 302 s = spltty(); 303 (void) lpt_intr(sc); 304 splx(s); 305 } 306 error = tsleep((void *) sc, LPTPRI | PCATCH, 307 "lptwrite2", 0); 308 if (error) 309 return (error); 310 } 311 } 312 return (0); 313 } 314 315 /* 316 * Copy a line from user space to a local buffer, then call putc to get the 317 * chars moved to the output queue. 318 */ 319 int 320 lptwrite(dev_t dev, struct uio *uio, int flags) 321 { 322 struct lpt_softc *sc; 323 size_t n; 324 int error; 325 326 sc = device_lookup_private(&lpt_cd, LPTUNIT(dev)); 327 error = 0; 328 329 while ((n = min(LPT_BSIZE, uio->uio_resid)) != 0) { 330 uiomove(sc->sc_cp = sc->sc_inbuf->b_data, n, uio); 331 sc->sc_count = n; 332 error = pushbytes(sc); 333 if (error) { 334 /* 335 * Return accurate residual if interrupted or timed 336 * out. 337 */ 338 uio->uio_resid += sc->sc_count; 339 sc->sc_count = 0; 340 return (error); 341 } 342 } 343 return (0); 344 } 345 346 /* 347 * Handle printer interrupts which occur when the printer is ready to accept 348 * another char. 349 */ 350 int 351 lpt_intr(struct lpt_softc *sc) 352 { 353 354 if (sc->sc_count) { 355 /* send char */ 356 (sc->sc_funcs->lf_wrdata) (sc, *sc->sc_cp++); 357 sc->sc_count--; 358 sc->sc_state |= LPT_OBUSY; 359 } else 360 sc->sc_state &= ~LPT_OBUSY; 361 362 if (sc->sc_count == 0) { 363 /* none, wake up the top half to get more */ 364 wakeup((void *) sc); 365 } 366 367 return (1); 368 } 369 370 /* ARGSUSED */ 371 int 372 lptioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 373 { 374 375 return (ENODEV); 376 } 377
Indexes created Sat Sep 27 14:09:57 GMT 2025