lpt_mvme.c revision 1.2
1 /* $NetBSD: lpt_mvme.c,v 1.2 2002/09/06 13:18:43 gehenna 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * Copyright (c) 1993, 1994 Charles M. Hannum. 41 * Copyright (c) 1990 William F. Jolitz, TeleMuse 42 * All rights reserved. 43 * 44 * Redistribution and use in source and binary forms, with or without 45 * modification, are permitted provided that the following conditions 46 * are met: 47 * 1. Redistributions of source code must retain the above copyright 48 * notice, this list of conditions and the following disclaimer. 49 * 2. Redistributions in binary form must reproduce the above copyright 50 * notice, this list of conditions and the following disclaimer in the 51 * documentation and/or other materials provided with the distribution. 52 * 3. All advertising materials mentioning features or use of this software 53 * must display the following acknowledgement: 54 * This software is a component of "386BSD" developed by 55 * William F. Jolitz, TeleMuse. 56 * 4. Neither the name of the developer nor the name "386BSD" 57 * may be used to endorse or promote products derived from this software 58 * without specific prior written permission. 59 * 60 * THIS SOFTWARE IS A COMPONENT OF 386BSD DEVELOPED BY WILLIAM F. JOLITZ 61 * AND IS INTENDED FOR RESEARCH AND EDUCATIONAL PURPOSES ONLY. THIS 62 * SOFTWARE SHOULD NOT BE CONSIDERED TO BE A COMMERCIAL PRODUCT. 63 * THE DEVELOPER URGES THAT USERS WHO REQUIRE A COMMERCIAL PRODUCT 64 * NOT MAKE USE OF THIS WORK. 65 * 66 * FOR USERS WHO WISH TO UNDERSTAND THE 386BSD SYSTEM DEVELOPED 67 * BY WILLIAM F. JOLITZ, WE RECOMMEND THE USER STUDY WRITTEN 68 * REFERENCES SUCH AS THE "PORTING UNIX TO THE 386" SERIES 69 * (BEGINNING JANUARY 1991 "DR. DOBBS JOURNAL", USA AND BEGINNING 70 * JUNE 1991 "UNIX MAGAZIN", GERMANY) BY WILLIAM F. JOLITZ AND 71 * LYNNE GREER JOLITZ, AS WELL AS OTHER BOOKS ON UNIX AND THE 72 * ON-LINE 386BSD USER MANUAL BEFORE USE. A BOOK DISCUSSING THE INTERNALS 73 * OF 386BSD ENTITLED "386BSD FROM THE INSIDE OUT" WILL BE AVAILABLE LATE 1992. 74 * 75 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``AS IS'' AND 76 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 77 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 78 * ARE DISCLAIMED. IN NO EVENT SHALL THE DEVELOPER BE LIABLE 79 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 80 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 81 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 82 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 83 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 84 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 85 * SUCH DAMAGE. 86 */ 87 88 /* 89 * Device Driver for an MVME68K/MVME88K board's parallel printer port 90 * This driver attaches above the board-specific back-end. 91 */ 92 93 #include <sys/param.h> 94 #include <sys/systm.h> 95 #include <sys/proc.h> 96 #include <sys/user.h> 97 #include <sys/buf.h> 98 #include <sys/kernel.h> 99 #include <sys/ioctl.h> 100 #include <sys/uio.h> 101 #include <sys/device.h> 102 #include <sys/conf.h> 103 #include <sys/syslog.h> 104 105 #include <machine/cpu.h> 106 #include <machine/bus.h> 107 108 #include <dev/mvme/lptvar.h> 109 110 111 #define TIMEOUT hz*16 /* wait up to 16 seconds for a ready */ 112 #define STEP hz/4 113 114 #define LPTPRI (PZERO+8) 115 #define LPT_BSIZE 1024 116 117 #if !defined(DEBUG) || !defined(notdef) 118 #define LPRINTF(a) 119 #else 120 #define LPRINTF if (lptdebug) printf a 121 int lptdebug = 1; 122 #endif 123 124 #define LPTUNIT(s) (minor(s) & 0x0f) 125 #define LPTFLAGS(s) (minor(s) & 0xf0) 126 127 static void lpt_wakeup __P((void *arg)); 128 static int pushbytes __P((struct lpt_softc *)); 129 130 extern struct cfdriver lpt_cd; 131 132 dev_type_open(lptopen); 133 dev_type_close(lptclose); 134 dev_type_write(lptwrite); 135 dev_type_ioctl(lptioctl); 136 137 const struct cdevsw lpt_cdevsw = { 138 lptopen, lptclose, noread, lptwrite, lptioctl, 139 nostop, notty, nopoll, nommap, 140 }; 141 142 void 143 lpt_attach_subr(sc) 144 struct lpt_softc *sc; 145 { 146 147 sc->sc_state = 0; 148 callout_init(&sc->sc_wakeup_ch); 149 } 150 151 /* 152 * Reset the printer, then wait until it's selected and not busy. 153 */ 154 int 155 lptopen(dev, flag, mode, p) 156 dev_t dev; 157 int flag; 158 int mode; 159 struct proc *p; 160 { 161 int unit; 162 u_char flags; 163 struct lpt_softc *sc; 164 int error; 165 int spin; 166 167 unit = LPTUNIT(dev); 168 flags = LPTFLAGS(dev); 169 170 if (unit >= lpt_cd.cd_ndevs) 171 return (ENXIO); 172 sc = lpt_cd.cd_devs[unit]; 173 if (!sc) 174 return (ENXIO); 175 176 #ifdef DIAGNOSTIC 177 if (sc->sc_state) 178 printf("%s: stat=0x%x not zero\n", sc->sc_dev.dv_xname, 179 sc->sc_state); 180 #endif 181 182 if (sc->sc_state) 183 return (EBUSY); 184 185 sc->sc_state = LPT_INIT; 186 sc->sc_flags = flags; 187 LPRINTF(("%s: open: flags=0x%x\n", sc->sc_dev.dv_xname, flags)); 188 189 if ((flags & LPT_NOPRIME) == 0) { 190 /* assert Input Prime for 100 usec to start up printer */ 191 (sc->sc_funcs->lf_iprime) (sc); 192 } 193 194 /* select fast or slow strobe depending on minor device number */ 195 if (flags & LPT_FAST_STROBE) 196 (sc->sc_funcs->lf_speed) (sc, LPT_STROBE_FAST); 197 else 198 (sc->sc_funcs->lf_speed) (sc, LPT_STROBE_SLOW); 199 200 /* wait till ready (printer running diagnostics) */ 201 for (spin = 0; (sc->sc_funcs->lf_notrdy) (sc, 1); spin += STEP) { 202 if (spin >= TIMEOUT) { 203 sc->sc_state = 0; 204 return (EBUSY); 205 } 206 /* wait 1/4 second, give up if we get a signal */ 207 error = tsleep((caddr_t) sc, LPTPRI | PCATCH, "lptopen", STEP); 208 if (error != EWOULDBLOCK) { 209 sc->sc_state = 0; 210 return (error); 211 } 212 } 213 214 sc->sc_inbuf = geteblk(LPT_BSIZE); 215 sc->sc_count = 0; 216 sc->sc_state = LPT_OPEN; 217 218 if ((sc->sc_flags & LPT_NOINTR) == 0) 219 lpt_wakeup(sc); 220 221 (sc->sc_funcs->lf_open) (sc, sc->sc_flags & LPT_NOINTR); 222 223 LPRINTF(("%s: opened\n", sc->sc_dev.dv_xname)); 224 return (0); 225 } 226 227 void 228 lpt_wakeup(arg) 229 void *arg; 230 { 231 struct lpt_softc *sc; 232 int s; 233 234 sc = arg; 235 236 s = spltty(); 237 lpt_intr(sc); 238 splx(s); 239 240 callout_reset(&sc->sc_wakeup_ch, STEP, lpt_wakeup, sc); 241 } 242 243 /* 244 * Close the device, and free the local line buffer. 245 */ 246 int 247 lptclose(dev, flag, mode, p) 248 dev_t dev; 249 int flag; 250 int mode; 251 struct proc *p; 252 { 253 struct lpt_softc *sc; 254 int unit; 255 256 unit = LPTUNIT(dev); 257 sc = lpt_cd.cd_devs[unit]; 258 259 if (sc->sc_count) 260 (void) pushbytes(sc); 261 262 if ((sc->sc_flags & LPT_NOINTR) == 0) 263 callout_stop(&sc->sc_wakeup_ch); 264 265 (sc->sc_funcs->lf_close) (sc); 266 267 sc->sc_state = 0; 268 brelse(sc->sc_inbuf); 269 270 LPRINTF(("%s: closed\n", sc->sc_dev.dv_xname)); 271 return (0); 272 } 273 274 int 275 pushbytes(sc) 276 struct lpt_softc *sc; 277 { 278 int s, error, spin, tic; 279 280 if (sc->sc_flags & LPT_NOINTR) { 281 while (sc->sc_count > 0) { 282 spin = 0; 283 while ((sc->sc_funcs->lf_notrdy) (sc, 0)) { 284 if (++spin < sc->sc_spinmax) 285 continue; 286 tic = 0; 287 /* adapt busy-wait algorithm */ 288 sc->sc_spinmax++; 289 while ((sc->sc_funcs->lf_notrdy) (sc, 1)) { 290 /* exponential backoff */ 291 tic = tic + tic + 1; 292 if (tic > TIMEOUT) 293 tic = TIMEOUT; 294 error = tsleep((caddr_t) sc, 295 LPTPRI | PCATCH, "lptpsh", tic); 296 if (error != EWOULDBLOCK) 297 return (error); 298 } 299 break; 300 } 301 302 (sc->sc_funcs->lf_wrdata) (sc, *sc->sc_cp++); 303 sc->sc_count--; 304 305 /* adapt busy-wait algorithm */ 306 if (spin * 2 + 16 < sc->sc_spinmax) 307 sc->sc_spinmax--; 308 } 309 } else { 310 while (sc->sc_count > 0) { 311 /* if the printer is ready for a char, give it one */ 312 if ((sc->sc_state & LPT_OBUSY) == 0) { 313 LPRINTF(("%s: write %d\n", sc->sc_dev.dv_xname, 314 sc->sc_count)); 315 s = spltty(); 316 (void) lpt_intr(sc); 317 splx(s); 318 } 319 error = tsleep((caddr_t) sc, LPTPRI | PCATCH, 320 "lptwrite2", 0); 321 if (error) 322 return (error); 323 } 324 } 325 return (0); 326 } 327 328 /* 329 * Copy a line from user space to a local buffer, then call putc to get the 330 * chars moved to the output queue. 331 */ 332 int 333 lptwrite(dev, uio, flags) 334 dev_t dev; 335 struct uio *uio; 336 int flags; 337 { 338 struct lpt_softc *sc; 339 size_t n; 340 int error; 341 342 sc = lpt_cd.cd_devs[LPTUNIT(dev)]; 343 error = 0; 344 345 while ((n = min(LPT_BSIZE, uio->uio_resid)) != 0) { 346 uiomove(sc->sc_cp = sc->sc_inbuf->b_data, n, uio); 347 sc->sc_count = n; 348 error = pushbytes(sc); 349 if (error) { 350 /* 351 * Return accurate residual if interrupted or timed 352 * out. 353 */ 354 uio->uio_resid += sc->sc_count; 355 sc->sc_count = 0; 356 return (error); 357 } 358 } 359 return (0); 360 } 361 362 /* 363 * Handle printer interrupts which occur when the printer is ready to accept 364 * another char. 365 */ 366 int 367 lpt_intr(sc) 368 struct lpt_softc *sc; 369 { 370 371 if (sc->sc_count) { 372 /* send char */ 373 (sc->sc_funcs->lf_wrdata) (sc, *sc->sc_cp++); 374 sc->sc_count--; 375 sc->sc_state |= LPT_OBUSY; 376 } else 377 sc->sc_state &= ~LPT_OBUSY; 378 379 if (sc->sc_count == 0) { 380 /* none, wake up the top half to get more */ 381 wakeup((caddr_t) sc); 382 } 383 384 return (1); 385 } 386 387 /* ARGSUSED */ 388 int 389 lptioctl(dev, cmd, data, flag, p) 390 dev_t dev; 391 u_long cmd; 392 caddr_t data; 393 int flag; 394 struct proc *p; 395 { 396 397 return (ENODEV); 398 } 399
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