lpt.c revision 1.78
1 /* $NetBSD: lpt.c,v 1.78 2009/11/25 14:28:50 rmind 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 1.78 2009/11/25 14:28:50 rmind Exp $"); 58 59 #include <sys/param.h> 60 #include <sys/systm.h> 61 #include <sys/proc.h> 62 #include <sys/malloc.h> 63 #include <sys/kernel.h> 64 #include <sys/ioctl.h> 65 #include <sys/uio.h> 66 #include <sys/device.h> 67 #include <sys/conf.h> 68 #include <sys/syslog.h> 69 #include <sys/intr.h> 70 71 #include <sys/bus.h> 72 73 #include <dev/ic/lptreg.h> 74 #include <dev/ic/lptvar.h> 75 76 #define TIMEOUT hz*16 /* wait up to 16 seconds for a ready */ 77 #define STEP hz/4 78 79 #define LPTPRI (PZERO+8) 80 #define LPT_BSIZE 1024 81 82 #define LPTDEBUG 83 84 #ifndef LPTDEBUG 85 #define LPRINTF(a) 86 #else 87 #define LPRINTF(a) if (lptdebug) printf a 88 int lptdebug = 0; 89 #endif 90 91 extern struct cfdriver lpt_cd; 92 93 dev_type_open(lptopen); 94 dev_type_close(lptclose); 95 dev_type_write(lptwrite); 96 dev_type_ioctl(lptioctl); 97 98 const struct cdevsw lpt_cdevsw = { 99 lptopen, lptclose, noread, lptwrite, lptioctl, 100 nostop, notty, nopoll, nommap, nokqfilter, D_OTHER, 101 }; 102 103 #define LPTUNIT(s) (minor(s) & 0x1f) 104 #define LPTFLAGS(s) (minor(s) & 0xe0) 105 106 static void lptsoftintr(void *); 107 108 void 109 lpt_attach_subr(struct lpt_softc *sc) 110 { 111 bus_space_tag_t iot; 112 bus_space_handle_t ioh; 113 114 sc->sc_state = 0; 115 116 iot = sc->sc_iot; 117 ioh = sc->sc_ioh; 118 119 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 120 121 callout_init(&sc->sc_wakeup_ch, 0); 122 sc->sc_sih = softint_establish(SOFTINT_SERIAL, lptsoftintr, sc); 123 124 sc->sc_dev_ok = 1; 125 } 126 127 int 128 lpt_detach_subr(device_t self, int flags) 129 { 130 struct lpt_softc *sc = device_private(self); 131 132 sc->sc_dev_ok = 0; 133 softint_disestablish(sc->sc_sih); 134 callout_destroy(&sc->sc_wakeup_ch); 135 return 0; 136 } 137 138 /* 139 * Reset the printer, then wait until it's selected and not busy. 140 */ 141 int 142 lptopen(dev_t dev, int flag, int mode, struct lwp *l) 143 { 144 u_char flags = LPTFLAGS(dev); 145 struct lpt_softc *sc; 146 bus_space_tag_t iot; 147 bus_space_handle_t ioh; 148 u_char control; 149 int error; 150 int spin; 151 152 sc = device_lookup_private(&lpt_cd, LPTUNIT(dev)); 153 if (!sc || !sc->sc_dev_ok) 154 return ENXIO; 155 156 #if 0 /* XXX what to do? */ 157 if (sc->sc_irq == IRQUNK && (flags & LPT_NOINTR) == 0) 158 return ENXIO; 159 #endif 160 161 #ifdef DIAGNOSTIC 162 if (sc->sc_state) 163 aprint_verbose_dev(sc->sc_dev, "stat=0x%x not zero\n", 164 sc->sc_state); 165 #endif 166 167 if (sc->sc_state) 168 return EBUSY; 169 170 sc->sc_state = LPT_INIT; 171 sc->sc_flags = flags; 172 LPRINTF(("%s: open: flags=0x%x\n", device_xname(sc->sc_dev), 173 (unsigned)flags)); 174 iot = sc->sc_iot; 175 ioh = sc->sc_ioh; 176 177 if ((flags & LPT_NOPRIME) == 0) { 178 /* assert INIT for 100 usec to start up printer */ 179 bus_space_write_1(iot, ioh, lpt_control, LPC_SELECT); 180 delay(100); 181 } 182 183 control = LPC_SELECT | LPC_NINIT; 184 bus_space_write_1(iot, ioh, lpt_control, control); 185 186 /* wait till ready (printer running diagnostics) */ 187 for (spin = 0; NOT_READY_ERR(); spin += STEP) { 188 if (spin >= TIMEOUT) { 189 sc->sc_state = 0; 190 return EBUSY; 191 } 192 193 /* wait 1/4 second, give up if we get a signal */ 194 error = tsleep((void *)sc, LPTPRI | PCATCH, "lptopen", STEP); 195 if (error != EWOULDBLOCK) { 196 sc->sc_state = 0; 197 return error; 198 } 199 } 200 201 if ((flags & LPT_NOINTR) == 0) 202 control |= LPC_IENABLE; 203 if (flags & LPT_AUTOLF) 204 control |= LPC_AUTOLF; 205 sc->sc_control = control; 206 bus_space_write_1(iot, ioh, lpt_control, control); 207 208 sc->sc_inbuf = malloc(LPT_BSIZE, M_DEVBUF, M_WAITOK); 209 sc->sc_count = 0; 210 sc->sc_state = LPT_OPEN; 211 212 if ((sc->sc_flags & LPT_NOINTR) == 0) 213 lptwakeup(sc); 214 215 LPRINTF(("%s: opened\n", device_xname(sc->sc_dev))); 216 return 0; 217 } 218 219 int 220 lptnotready(u_char status, struct lpt_softc *sc) 221 { 222 u_char new; 223 224 status = (status ^ LPS_INVERT) & LPS_MASK; 225 new = status & ~sc->sc_laststatus; 226 sc->sc_laststatus = status; 227 228 if (sc->sc_state & LPT_OPEN) { 229 if (new & LPS_SELECT) 230 log(LOG_NOTICE, 231 "%s: offline\n", device_xname(sc->sc_dev)); 232 else if (new & LPS_NOPAPER) 233 log(LOG_NOTICE, 234 "%s: out of paper\n", device_xname(sc->sc_dev)); 235 else if (new & LPS_NERR) 236 log(LOG_NOTICE, 237 "%s: output error\n", device_xname(sc->sc_dev)); 238 } 239 240 return status; 241 } 242 243 void 244 lptwakeup(void *arg) 245 { 246 struct lpt_softc *sc = arg; 247 int s; 248 249 s = splvm(); 250 lptintr(sc); 251 splx(s); 252 253 callout_reset(&sc->sc_wakeup_ch, STEP, lptwakeup, sc); 254 } 255 256 /* 257 * Close the device, and free the local line buffer. 258 */ 259 int 260 lptclose(dev_t dev, int flag, int mode, 261 struct lwp *l) 262 { 263 struct lpt_softc *sc = 264 device_lookup_private(&lpt_cd, LPTUNIT(dev)); 265 bus_space_tag_t iot = sc->sc_iot; 266 bus_space_handle_t ioh = sc->sc_ioh; 267 268 if (sc->sc_count) 269 (void) lptpushbytes(sc); 270 271 if ((sc->sc_flags & LPT_NOINTR) == 0) 272 callout_stop(&sc->sc_wakeup_ch); 273 274 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 275 sc->sc_state = 0; 276 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 277 free(sc->sc_inbuf, M_DEVBUF); 278 279 LPRINTF(("%s: closed\n", device_xname(sc->sc_dev))); 280 return 0; 281 } 282 283 int 284 lptpushbytes(struct lpt_softc *sc) 285 { 286 bus_space_tag_t iot = sc->sc_iot; 287 bus_space_handle_t ioh = sc->sc_ioh; 288 int error; 289 290 if (sc->sc_flags & LPT_NOINTR) { 291 int spin, tic; 292 u_char control = sc->sc_control; 293 294 while (sc->sc_count > 0) { 295 spin = 0; 296 while (NOT_READY()) { 297 if (++spin < sc->sc_spinmax) 298 continue; 299 tic = 0; 300 /* adapt busy-wait algorithm */ 301 sc->sc_spinmax++; 302 while (NOT_READY_ERR()) { 303 /* exponential backoff */ 304 tic = tic + tic + 1; 305 if (tic > TIMEOUT) 306 tic = TIMEOUT; 307 error = tsleep((void *)sc, 308 LPTPRI | PCATCH, "lptpsh", tic); 309 if (error != EWOULDBLOCK) 310 return error; 311 } 312 break; 313 } 314 315 bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++); 316 DELAY(1); 317 bus_space_write_1(iot, ioh, lpt_control, 318 control | LPC_STROBE); 319 DELAY(1); 320 sc->sc_count--; 321 bus_space_write_1(iot, ioh, lpt_control, control); 322 DELAY(1); 323 324 /* adapt busy-wait algorithm */ 325 if (spin*2 + 16 < sc->sc_spinmax) 326 sc->sc_spinmax--; 327 } 328 } else { 329 int s; 330 331 while (sc->sc_count > 0) { 332 /* if the printer is ready for a char, give it one */ 333 if ((sc->sc_state & LPT_OBUSY) == 0) { 334 LPRINTF(("%s: write %lu\n", 335 device_xname(sc->sc_dev), 336 (u_long)sc->sc_count)); 337 s = splvm(); 338 (void) lptintr(sc); 339 splx(s); 340 } 341 error = tsleep((void *)sc, LPTPRI | PCATCH, 342 "lptwrite2", 0); 343 if (error) 344 return error; 345 } 346 } 347 return 0; 348 } 349 350 /* 351 * Copy a line from user space to a local buffer, then call putc to get the 352 * chars moved to the output queue. 353 */ 354 int 355 lptwrite(dev_t dev, struct uio *uio, int flags) 356 { 357 struct lpt_softc *sc = 358 device_lookup_private(&lpt_cd, LPTUNIT(dev)); 359 size_t n; 360 int error = 0; 361 362 while ((n = min(LPT_BSIZE, uio->uio_resid)) != 0) { 363 uiomove(sc->sc_cp = sc->sc_inbuf, n, uio); 364 sc->sc_count = n; 365 error = lptpushbytes(sc); 366 if (error) { 367 /* 368 * Return accurate residual if interrupted or timed 369 * out. 370 */ 371 uio->uio_resid += sc->sc_count; 372 sc->sc_count = 0; 373 return error; 374 } 375 } 376 return 0; 377 } 378 379 /* 380 * Handle printer interrupts which occur when the printer is ready to accept 381 * another char. 382 */ 383 int 384 lptintr(void *arg) 385 { 386 struct lpt_softc *sc = arg; 387 bus_space_tag_t iot = sc->sc_iot; 388 bus_space_handle_t ioh = sc->sc_ioh; 389 390 #if 0 391 if ((sc->sc_state & LPT_OPEN) == 0) 392 return 0; 393 #endif 394 395 /* is printer online and ready for output */ 396 if (NOT_READY() && NOT_READY_ERR()) 397 return 0; 398 399 if (sc->sc_count) { 400 u_char control = sc->sc_control; 401 /* send char */ 402 bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++); 403 DELAY(1); 404 bus_space_write_1(iot, ioh, lpt_control, control | LPC_STROBE); 405 DELAY(1); 406 sc->sc_count--; 407 bus_space_write_1(iot, ioh, lpt_control, control); 408 DELAY(1); 409 sc->sc_state |= LPT_OBUSY; 410 } else 411 sc->sc_state &= ~LPT_OBUSY; 412 413 if (sc->sc_count == 0) { 414 /* none, wake up the top half to get more */ 415 softint_schedule(sc->sc_sih); 416 } 417 418 return 1; 419 } 420 421 static void 422 lptsoftintr(void *cookie) 423 { 424 425 wakeup(cookie); 426 } 427 428 int 429 lptioctl(dev_t dev, u_long cmd, void *data, 430 int flag, struct lwp *l) 431 { 432 return ENODEV; 433 } 434
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