lpt.c revision 1.71
1 /* $NetBSD: lpt.c,v 1.71 2007/10/09 12:45:27 ad Exp $ */ 2 3 /* 4 * Copyright (c) 1993, 1994 Charles M. Hannum. 5 * Copyright (c) 1990 William F. Jolitz, TeleMuse 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This software is a component of "386BSD" developed by 19 * William F. Jolitz, TeleMuse. 20 * 4. Neither the name of the developer nor the name "386BSD" 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS A COMPONENT OF 386BSD DEVELOPED BY WILLIAM F. JOLITZ 25 * AND IS INTENDED FOR RESEARCH AND EDUCATIONAL PURPOSES ONLY. THIS 26 * SOFTWARE SHOULD NOT BE CONSIDERED TO BE A COMMERCIAL PRODUCT. 27 * THE DEVELOPER URGES THAT USERS WHO REQUIRE A COMMERCIAL PRODUCT 28 * NOT MAKE USE OF THIS WORK. 29 * 30 * FOR USERS WHO WISH TO UNDERSTAND THE 386BSD SYSTEM DEVELOPED 31 * BY WILLIAM F. JOLITZ, WE RECOMMEND THE USER STUDY WRITTEN 32 * REFERENCES SUCH AS THE "PORTING UNIX TO THE 386" SERIES 33 * (BEGINNING JANUARY 1991 "DR. DOBBS JOURNAL", USA AND BEGINNING 34 * JUNE 1991 "UNIX MAGAZIN", GERMANY) BY WILLIAM F. JOLITZ AND 35 * LYNNE GREER JOLITZ, AS WELL AS OTHER BOOKS ON UNIX AND THE 36 * ON-LINE 386BSD USER MANUAL BEFORE USE. A BOOK DISCUSSING THE INTERNALS 37 * OF 386BSD ENTITLED "386BSD FROM THE INSIDE OUT" WILL BE AVAILABLE LATE 1992. 38 * 39 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``AS IS'' AND 40 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 42 * ARE DISCLAIMED. IN NO EVENT SHALL THE DEVELOPER BE LIABLE 43 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 44 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 45 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 46 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 47 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 48 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 49 * SUCH DAMAGE. 50 */ 51 52 /* 53 * Device Driver for AT style parallel printer port 54 */ 55 56 #include <sys/cdefs.h> 57 __KERNEL_RCSID(0, "$NetBSD: lpt.c,v 1.71 2007/10/09 12:45:27 ad Exp $"); 58 59 #include <sys/param.h> 60 #include <sys/systm.h> 61 #include <sys/proc.h> 62 #include <sys/user.h> 63 #include <sys/malloc.h> 64 #include <sys/kernel.h> 65 #include <sys/ioctl.h> 66 #include <sys/uio.h> 67 #include <sys/device.h> 68 #include <sys/conf.h> 69 #include <sys/syslog.h> 70 #include <sys/intr.h> 71 72 #include <machine/bus.h> 73 74 #include <dev/ic/lptreg.h> 75 #include <dev/ic/lptvar.h> 76 77 #define TIMEOUT hz*16 /* wait up to 16 seconds for a ready */ 78 #define STEP hz/4 79 80 #define LPTPRI (PZERO+8) 81 #define LPT_BSIZE 1024 82 83 #define LPTDEBUG 84 85 #ifndef LPTDEBUG 86 #define LPRINTF(a) 87 #else 88 #define LPRINTF(a) if (lptdebug) printf a 89 int lptdebug = 0; 90 #endif 91 92 extern struct cfdriver lpt_cd; 93 94 dev_type_open(lptopen); 95 dev_type_close(lptclose); 96 dev_type_write(lptwrite); 97 dev_type_ioctl(lptioctl); 98 99 const struct cdevsw lpt_cdevsw = { 100 lptopen, lptclose, noread, lptwrite, lptioctl, 101 nostop, notty, nopoll, nommap, nokqfilter, D_OTHER, 102 }; 103 104 #define LPTUNIT(s) (minor(s) & 0x1f) 105 #define LPTFLAGS(s) (minor(s) & 0xe0) 106 107 static void lptsoftintr(void *); 108 109 void 110 lpt_attach_subr(sc) 111 struct lpt_softc *sc; 112 { 113 bus_space_tag_t iot; 114 bus_space_handle_t ioh; 115 116 sc->sc_state = 0; 117 118 iot = sc->sc_iot; 119 ioh = sc->sc_ioh; 120 121 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 122 123 callout_init(&sc->sc_wakeup_ch, 0); 124 sc->sc_sih = softint_establish(SOFTINT_SERIAL, lptsoftintr, sc); 125 126 sc->sc_dev_ok = 1; 127 } 128 129 /* 130 * Reset the printer, then wait until it's selected and not busy. 131 */ 132 int 133 lptopen(dev_t dev, int flag, int mode, struct lwp *l) 134 { 135 u_char flags = LPTFLAGS(dev); 136 struct lpt_softc *sc; 137 bus_space_tag_t iot; 138 bus_space_handle_t ioh; 139 u_char control; 140 int error; 141 int spin; 142 143 sc = device_lookup(&lpt_cd, LPTUNIT(dev)); 144 if (!sc || !sc->sc_dev_ok) 145 return ENXIO; 146 147 #if 0 /* XXX what to do? */ 148 if (sc->sc_irq == IRQUNK && (flags & LPT_NOINTR) == 0) 149 return ENXIO; 150 #endif 151 152 #ifdef DIAGNOSTIC 153 if (sc->sc_state) 154 printf("%s: stat=0x%x not zero\n", sc->sc_dev.dv_xname, 155 sc->sc_state); 156 #endif 157 158 if (sc->sc_state) 159 return EBUSY; 160 161 sc->sc_state = LPT_INIT; 162 sc->sc_flags = flags; 163 LPRINTF(("%s: open: flags=0x%x\n", sc->sc_dev.dv_xname, 164 (unsigned)flags)); 165 iot = sc->sc_iot; 166 ioh = sc->sc_ioh; 167 168 if ((flags & LPT_NOPRIME) == 0) { 169 /* assert INIT for 100 usec to start up printer */ 170 bus_space_write_1(iot, ioh, lpt_control, LPC_SELECT); 171 delay(100); 172 } 173 174 control = LPC_SELECT | LPC_NINIT; 175 bus_space_write_1(iot, ioh, lpt_control, control); 176 177 /* wait till ready (printer running diagnostics) */ 178 for (spin = 0; NOT_READY_ERR(); spin += STEP) { 179 if (spin >= TIMEOUT) { 180 sc->sc_state = 0; 181 return EBUSY; 182 } 183 184 /* wait 1/4 second, give up if we get a signal */ 185 error = tsleep((void *)sc, LPTPRI | PCATCH, "lptopen", STEP); 186 if (error != EWOULDBLOCK) { 187 sc->sc_state = 0; 188 return error; 189 } 190 } 191 192 if ((flags & LPT_NOINTR) == 0) 193 control |= LPC_IENABLE; 194 if (flags & LPT_AUTOLF) 195 control |= LPC_AUTOLF; 196 sc->sc_control = control; 197 bus_space_write_1(iot, ioh, lpt_control, control); 198 199 sc->sc_inbuf = malloc(LPT_BSIZE, M_DEVBUF, M_WAITOK); 200 sc->sc_count = 0; 201 sc->sc_state = LPT_OPEN; 202 203 if ((sc->sc_flags & LPT_NOINTR) == 0) 204 lptwakeup(sc); 205 206 LPRINTF(("%s: opened\n", sc->sc_dev.dv_xname)); 207 return 0; 208 } 209 210 int 211 lptnotready(status, sc) 212 u_char status; 213 struct lpt_softc *sc; 214 { 215 u_char new; 216 217 status = (status ^ LPS_INVERT) & LPS_MASK; 218 new = status & ~sc->sc_laststatus; 219 sc->sc_laststatus = status; 220 221 if (sc->sc_state & LPT_OPEN) { 222 if (new & LPS_SELECT) 223 log(LOG_NOTICE, 224 "%s: offline\n", sc->sc_dev.dv_xname); 225 else if (new & LPS_NOPAPER) 226 log(LOG_NOTICE, 227 "%s: out of paper\n", sc->sc_dev.dv_xname); 228 else if (new & LPS_NERR) 229 log(LOG_NOTICE, 230 "%s: output error\n", sc->sc_dev.dv_xname); 231 } 232 233 return status; 234 } 235 236 void 237 lptwakeup(arg) 238 void *arg; 239 { 240 struct lpt_softc *sc = arg; 241 int s; 242 243 s = spllpt(); 244 lptintr(sc); 245 splx(s); 246 247 callout_reset(&sc->sc_wakeup_ch, STEP, lptwakeup, sc); 248 } 249 250 /* 251 * Close the device, and free the local line buffer. 252 */ 253 int 254 lptclose(dev_t dev, int flag, int mode, 255 struct lwp *l) 256 { 257 struct lpt_softc *sc = device_lookup(&lpt_cd, LPTUNIT(dev)); 258 bus_space_tag_t iot = sc->sc_iot; 259 bus_space_handle_t ioh = sc->sc_ioh; 260 261 if (sc->sc_count) 262 (void) lptpushbytes(sc); 263 264 if ((sc->sc_flags & LPT_NOINTR) == 0) 265 callout_stop(&sc->sc_wakeup_ch); 266 267 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 268 sc->sc_state = 0; 269 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 270 free(sc->sc_inbuf, M_DEVBUF); 271 272 LPRINTF(("%s: closed\n", sc->sc_dev.dv_xname)); 273 return 0; 274 } 275 276 int 277 lptpushbytes(sc) 278 struct lpt_softc *sc; 279 { 280 bus_space_tag_t iot = sc->sc_iot; 281 bus_space_handle_t ioh = sc->sc_ioh; 282 int error; 283 284 if (sc->sc_flags & LPT_NOINTR) { 285 int spin, tic; 286 u_char control = sc->sc_control; 287 288 while (sc->sc_count > 0) { 289 spin = 0; 290 while (NOT_READY()) { 291 if (++spin < sc->sc_spinmax) 292 continue; 293 tic = 0; 294 /* adapt busy-wait algorithm */ 295 sc->sc_spinmax++; 296 while (NOT_READY_ERR()) { 297 /* exponential backoff */ 298 tic = tic + tic + 1; 299 if (tic > TIMEOUT) 300 tic = TIMEOUT; 301 error = tsleep((void *)sc, 302 LPTPRI | PCATCH, "lptpsh", tic); 303 if (error != EWOULDBLOCK) 304 return error; 305 } 306 break; 307 } 308 309 bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++); 310 DELAY(1); 311 bus_space_write_1(iot, ioh, lpt_control, 312 control | LPC_STROBE); 313 DELAY(1); 314 sc->sc_count--; 315 bus_space_write_1(iot, ioh, lpt_control, control); 316 DELAY(1); 317 318 /* adapt busy-wait algorithm */ 319 if (spin*2 + 16 < sc->sc_spinmax) 320 sc->sc_spinmax--; 321 } 322 } else { 323 int s; 324 325 while (sc->sc_count > 0) { 326 /* if the printer is ready for a char, give it one */ 327 if ((sc->sc_state & LPT_OBUSY) == 0) { 328 LPRINTF(("%s: write %lu\n", sc->sc_dev.dv_xname, 329 (u_long)sc->sc_count)); 330 s = spllpt(); 331 (void) lptintr(sc); 332 splx(s); 333 } 334 error = tsleep((void *)sc, LPTPRI | PCATCH, 335 "lptwrite2", 0); 336 if (error) 337 return error; 338 } 339 } 340 return 0; 341 } 342 343 /* 344 * Copy a line from user space to a local buffer, then call putc to get the 345 * chars moved to the output queue. 346 */ 347 int 348 lptwrite(dev_t dev, struct uio *uio, int flags) 349 { 350 struct lpt_softc *sc = device_lookup(&lpt_cd, LPTUNIT(dev)); 351 size_t n; 352 int error = 0; 353 354 while ((n = min(LPT_BSIZE, uio->uio_resid)) != 0) { 355 uiomove(sc->sc_cp = sc->sc_inbuf, n, uio); 356 sc->sc_count = n; 357 error = lptpushbytes(sc); 358 if (error) { 359 /* 360 * Return accurate residual if interrupted or timed 361 * out. 362 */ 363 uio->uio_resid += sc->sc_count; 364 sc->sc_count = 0; 365 return error; 366 } 367 } 368 return 0; 369 } 370 371 /* 372 * Handle printer interrupts which occur when the printer is ready to accept 373 * another char. 374 */ 375 int 376 lptintr(arg) 377 void *arg; 378 { 379 struct lpt_softc *sc = arg; 380 bus_space_tag_t iot = sc->sc_iot; 381 bus_space_handle_t ioh = sc->sc_ioh; 382 383 #if 0 384 if ((sc->sc_state & LPT_OPEN) == 0) 385 return 0; 386 #endif 387 388 /* is printer online and ready for output */ 389 if (NOT_READY() && NOT_READY_ERR()) 390 return 0; 391 392 if (sc->sc_count) { 393 u_char control = sc->sc_control; 394 /* send char */ 395 bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++); 396 DELAY(1); 397 bus_space_write_1(iot, ioh, lpt_control, control | LPC_STROBE); 398 DELAY(1); 399 sc->sc_count--; 400 bus_space_write_1(iot, ioh, lpt_control, control); 401 DELAY(1); 402 sc->sc_state |= LPT_OBUSY; 403 } else 404 sc->sc_state &= ~LPT_OBUSY; 405 406 if (sc->sc_count == 0) { 407 /* none, wake up the top half to get more */ 408 softint_schedule(sc->sc_sih); 409 } 410 411 return 1; 412 } 413 414 static void 415 lptsoftintr(void *cookie) 416 { 417 418 wakeup(cookie); 419 } 420 421 int 422 lptioctl(dev_t dev, u_long cmd, void *data, 423 int flag, struct lwp *l) 424 { 425 return ENODEV; 426 } 427
Indexes created Wed Sep 24 15:09:51 GMT 2025