1 /* $NetBSD: lpt_mvme.c,v 1.19 2018/09/03 16:29:32 riastradh 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 1.19 2018/09/03 16:29:32 riastradh 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_discard = nodiscard, 144 .d_flag = 0 145 }; 146 147 void 148 lpt_attach_subr(struct lpt_softc *sc) 149 { 150 151 sc->sc_state = 0; 152 callout_init(&sc->sc_wakeup_ch, 0); 153 } 154 155 /* 156 * Reset the printer, then wait until it's selected and not busy. 157 */ 158 int 159 lptopen(dev_t dev, int flag, int mode, struct lwp *l) 160 { 161 u_char flags; 162 struct lpt_softc *sc; 163 int error; 164 int spin; 165 166 flags = LPTFLAGS(dev); 167 168 sc = device_lookup_private(&lpt_cd, LPTUNIT(dev)); 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(void *arg) 225 { 226 struct lpt_softc *sc; 227 int s; 228 229 sc = arg; 230 231 s = spltty(); 232 lpt_intr(sc); 233 splx(s); 234 235 callout_reset(&sc->sc_wakeup_ch, STEP, lpt_wakeup, sc); 236 } 237 238 /* 239 * Close the device, and free the local line buffer. 240 */ 241 int 242 lptclose(dev_t dev, int flag, int mode, struct lwp *l) 243 { 244 struct lpt_softc *sc; 245 246 sc = device_lookup_private(&lpt_cd, LPTUNIT(dev)); 247 248 if (sc->sc_count) 249 (void) pushbytes(sc); 250 251 if ((sc->sc_flags & LPT_NOINTR) == 0) 252 callout_stop(&sc->sc_wakeup_ch); 253 254 (sc->sc_funcs->lf_close) (sc); 255 256 sc->sc_state = 0; 257 brelse(sc->sc_inbuf, 0); 258 259 LPRINTF((sc->sc_dev, "%s: closed\n")); 260 return (0); 261 } 262 263 int 264 pushbytes(struct lpt_softc *sc) 265 { 266 int s, error, spin, tic; 267 268 if (sc->sc_flags & LPT_NOINTR) { 269 while (sc->sc_count > 0) { 270 spin = 0; 271 while ((sc->sc_funcs->lf_notrdy) (sc, 0)) { 272 if (++spin < sc->sc_spinmax) 273 continue; 274 tic = 0; 275 /* adapt busy-wait algorithm */ 276 sc->sc_spinmax++; 277 while ((sc->sc_funcs->lf_notrdy) (sc, 1)) { 278 /* exponential backoff */ 279 tic = tic + tic + 1; 280 if (tic > TIMEOUT) 281 tic = TIMEOUT; 282 error = tsleep((void *) sc, 283 LPTPRI | PCATCH, "lptpsh", tic); 284 if (error != EWOULDBLOCK) 285 return (error); 286 } 287 break; 288 } 289 290 (sc->sc_funcs->lf_wrdata) (sc, *sc->sc_cp++); 291 sc->sc_count--; 292 293 /* adapt busy-wait algorithm */ 294 if (spin * 2 + 16 < sc->sc_spinmax) 295 sc->sc_spinmax--; 296 } 297 } else { 298 while (sc->sc_count > 0) { 299 /* if the printer is ready for a char, give it one */ 300 if ((sc->sc_state & LPT_OBUSY) == 0) { 301 LPRINTF((sc->sc_dev, "write %d\n", 302 sc->sc_count)); 303 s = spltty(); 304 (void) lpt_intr(sc); 305 splx(s); 306 } 307 error = tsleep((void *) sc, LPTPRI | PCATCH, 308 "lptwrite2", 0); 309 if (error) 310 return (error); 311 } 312 } 313 return (0); 314 } 315 316 /* 317 * Copy a line from user space to a local buffer, then call putc to get the 318 * chars moved to the output queue. 319 */ 320 int 321 lptwrite(dev_t dev, struct uio *uio, int flags) 322 { 323 struct lpt_softc *sc; 324 size_t n; 325 int error; 326 327 sc = device_lookup_private(&lpt_cd, LPTUNIT(dev)); 328 error = 0; 329 330 while ((n = uimin(LPT_BSIZE, uio->uio_resid)) != 0) { 331 uiomove(sc->sc_cp = sc->sc_inbuf->b_data, n, uio); 332 sc->sc_count = n; 333 error = pushbytes(sc); 334 if (error) { 335 /* 336 * Return accurate residual if interrupted or timed 337 * out. 338 */ 339 uio->uio_resid += sc->sc_count; 340 sc->sc_count = 0; 341 return (error); 342 } 343 } 344 return (0); 345 } 346 347 /* 348 * Handle printer interrupts which occur when the printer is ready to accept 349 * another char. 350 */ 351 int 352 lpt_intr(struct lpt_softc *sc) 353 { 354 355 if (sc->sc_count) { 356 /* send char */ 357 (sc->sc_funcs->lf_wrdata) (sc, *sc->sc_cp++); 358 sc->sc_count--; 359 sc->sc_state |= LPT_OBUSY; 360 } else 361 sc->sc_state &= ~LPT_OBUSY; 362 363 if (sc->sc_count == 0) { 364 /* none, wake up the top half to get more */ 365 wakeup((void *) sc); 366 } 367 368 return (1); 369 } 370 371 /* ARGSUSED */ 372 int 373 lptioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 374 { 375 376 return (ENODEV); 377 } 378
Indexes created Thu Sep 25 16:09:42 GMT 2025