lpt.c revision 1.80
1 /* $NetBSD: lpt.c,v 1.80 2014/07/25 08:10:37 dholland 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 1.80 2014/07/25 08:10:37 dholland 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 .d_open = lptopen, 100 .d_close = lptclose, 101 .d_read = noread, 102 .d_write = lptwrite, 103 .d_ioctl = lptioctl, 104 .d_stop = nostop, 105 .d_tty = notty, 106 .d_poll = nopoll, 107 .d_mmap = nommap, 108 .d_kqfilter = nokqfilter, 109 .d_discard = nodiscard, 110 .d_flag = D_OTHER 111 }; 112 113 #define LPTUNIT(s) (minor(s) & 0x1f) 114 #define LPTFLAGS(s) (minor(s) & 0xe0) 115 116 static void lptsoftintr(void *); 117 118 void 119 lpt_attach_subr(struct lpt_softc *sc) 120 { 121 bus_space_tag_t iot; 122 bus_space_handle_t ioh; 123 124 sc->sc_state = 0; 125 126 iot = sc->sc_iot; 127 ioh = sc->sc_ioh; 128 129 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 130 131 callout_init(&sc->sc_wakeup_ch, 0); 132 sc->sc_sih = softint_establish(SOFTINT_SERIAL, lptsoftintr, sc); 133 134 sc->sc_dev_ok = 1; 135 } 136 137 int 138 lpt_detach_subr(device_t self, int flags) 139 { 140 struct lpt_softc *sc = device_private(self); 141 142 sc->sc_dev_ok = 0; 143 softint_disestablish(sc->sc_sih); 144 callout_destroy(&sc->sc_wakeup_ch); 145 return 0; 146 } 147 148 /* 149 * Reset the printer, then wait until it's selected and not busy. 150 */ 151 int 152 lptopen(dev_t dev, int flag, int mode, struct lwp *l) 153 { 154 u_char flags = LPTFLAGS(dev); 155 struct lpt_softc *sc; 156 bus_space_tag_t iot; 157 bus_space_handle_t ioh; 158 u_char control; 159 int error; 160 int spin; 161 162 sc = device_lookup_private(&lpt_cd, LPTUNIT(dev)); 163 if (!sc || !sc->sc_dev_ok) 164 return ENXIO; 165 166 #if 0 /* XXX what to do? */ 167 if (sc->sc_irq == IRQUNK && (flags & LPT_NOINTR) == 0) 168 return ENXIO; 169 #endif 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(("%s: open: flags=0x%x\n", device_xname(sc->sc_dev), 183 (unsigned)flags)); 184 iot = sc->sc_iot; 185 ioh = sc->sc_ioh; 186 187 if ((flags & LPT_NOPRIME) == 0) { 188 /* assert INIT for 100 usec to start up printer */ 189 bus_space_write_1(iot, ioh, lpt_control, LPC_SELECT); 190 delay(100); 191 } 192 193 control = LPC_SELECT | LPC_NINIT; 194 bus_space_write_1(iot, ioh, lpt_control, control); 195 196 /* wait till ready (printer running diagnostics) */ 197 for (spin = 0; NOT_READY_ERR(); spin += STEP) { 198 if (spin >= TIMEOUT) { 199 sc->sc_state = 0; 200 return EBUSY; 201 } 202 203 /* wait 1/4 second, give up if we get a signal */ 204 error = tsleep((void *)sc, LPTPRI | PCATCH, "lptopen", STEP); 205 if (error != EWOULDBLOCK) { 206 sc->sc_state = 0; 207 return error; 208 } 209 } 210 211 if ((flags & LPT_NOINTR) == 0) 212 control |= LPC_IENABLE; 213 if (flags & LPT_AUTOLF) 214 control |= LPC_AUTOLF; 215 sc->sc_control = control; 216 bus_space_write_1(iot, ioh, lpt_control, control); 217 218 sc->sc_inbuf = malloc(LPT_BSIZE, M_DEVBUF, M_WAITOK); 219 sc->sc_count = 0; 220 sc->sc_state = LPT_OPEN; 221 222 if ((sc->sc_flags & LPT_NOINTR) == 0) 223 lptwakeup(sc); 224 225 LPRINTF(("%s: opened\n", device_xname(sc->sc_dev))); 226 return 0; 227 } 228 229 int 230 lptnotready(u_char status, struct lpt_softc *sc) 231 { 232 u_char new; 233 234 status = (status ^ LPS_INVERT) & LPS_MASK; 235 new = status & ~sc->sc_laststatus; 236 sc->sc_laststatus = status; 237 238 if (sc->sc_state & LPT_OPEN) { 239 if (new & LPS_SELECT) 240 log(LOG_NOTICE, 241 "%s: offline\n", device_xname(sc->sc_dev)); 242 else if (new & LPS_NOPAPER) 243 log(LOG_NOTICE, 244 "%s: out of paper\n", device_xname(sc->sc_dev)); 245 else if (new & LPS_NERR) 246 log(LOG_NOTICE, 247 "%s: output error\n", device_xname(sc->sc_dev)); 248 } 249 250 return status; 251 } 252 253 void 254 lptwakeup(void *arg) 255 { 256 struct lpt_softc *sc = arg; 257 int s; 258 259 s = splvm(); 260 lptintr(sc); 261 splx(s); 262 263 callout_reset(&sc->sc_wakeup_ch, STEP, lptwakeup, sc); 264 } 265 266 /* 267 * Close the device, and free the local line buffer. 268 */ 269 int 270 lptclose(dev_t dev, int flag, int mode, 271 struct lwp *l) 272 { 273 struct lpt_softc *sc = 274 device_lookup_private(&lpt_cd, LPTUNIT(dev)); 275 bus_space_tag_t iot = sc->sc_iot; 276 bus_space_handle_t ioh = sc->sc_ioh; 277 278 if (sc->sc_count) 279 (void) lptpushbytes(sc); 280 281 if ((sc->sc_flags & LPT_NOINTR) == 0) 282 callout_stop(&sc->sc_wakeup_ch); 283 284 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 285 sc->sc_state = 0; 286 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 287 free(sc->sc_inbuf, M_DEVBUF); 288 289 LPRINTF(("%s: closed\n", device_xname(sc->sc_dev))); 290 return 0; 291 } 292 293 int 294 lptpushbytes(struct lpt_softc *sc) 295 { 296 bus_space_tag_t iot = sc->sc_iot; 297 bus_space_handle_t ioh = sc->sc_ioh; 298 int error; 299 300 if (sc->sc_flags & LPT_NOINTR) { 301 int spin, tic; 302 u_char control = sc->sc_control; 303 304 while (sc->sc_count > 0) { 305 spin = 0; 306 while (NOT_READY()) { 307 if (++spin < sc->sc_spinmax) 308 continue; 309 tic = 0; 310 /* adapt busy-wait algorithm */ 311 sc->sc_spinmax++; 312 while (NOT_READY_ERR()) { 313 /* exponential backoff */ 314 tic = tic + tic + 1; 315 if (tic > TIMEOUT) 316 tic = TIMEOUT; 317 error = tsleep((void *)sc, 318 LPTPRI | PCATCH, "lptpsh", tic); 319 if (error != EWOULDBLOCK) 320 return error; 321 } 322 break; 323 } 324 325 bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++); 326 DELAY(1); 327 bus_space_write_1(iot, ioh, lpt_control, 328 control | LPC_STROBE); 329 DELAY(1); 330 sc->sc_count--; 331 bus_space_write_1(iot, ioh, lpt_control, control); 332 DELAY(1); 333 334 /* adapt busy-wait algorithm */ 335 if (spin*2 + 16 < sc->sc_spinmax) 336 sc->sc_spinmax--; 337 } 338 } else { 339 int s; 340 341 while (sc->sc_count > 0) { 342 /* if the printer is ready for a char, give it one */ 343 if ((sc->sc_state & LPT_OBUSY) == 0) { 344 LPRINTF(("%s: write %lu\n", 345 device_xname(sc->sc_dev), 346 (u_long)sc->sc_count)); 347 s = splvm(); 348 (void) lptintr(sc); 349 splx(s); 350 } 351 error = tsleep((void *)sc, LPTPRI | PCATCH, 352 "lptwrite2", 0); 353 if (error) 354 return error; 355 } 356 } 357 return 0; 358 } 359 360 /* 361 * Copy a line from user space to a local buffer, then call putc to get the 362 * chars moved to the output queue. 363 */ 364 int 365 lptwrite(dev_t dev, struct uio *uio, int flags) 366 { 367 struct lpt_softc *sc = 368 device_lookup_private(&lpt_cd, LPTUNIT(dev)); 369 size_t n; 370 int error = 0; 371 372 while ((n = min(LPT_BSIZE, uio->uio_resid)) != 0) { 373 uiomove(sc->sc_cp = sc->sc_inbuf, n, uio); 374 sc->sc_count = n; 375 error = lptpushbytes(sc); 376 if (error) { 377 /* 378 * Return accurate residual if interrupted or timed 379 * out. 380 */ 381 uio->uio_resid += sc->sc_count; 382 sc->sc_count = 0; 383 return error; 384 } 385 } 386 return 0; 387 } 388 389 /* 390 * Handle printer interrupts which occur when the printer is ready to accept 391 * another char. 392 */ 393 int 394 lptintr(void *arg) 395 { 396 struct lpt_softc *sc = arg; 397 bus_space_tag_t iot = sc->sc_iot; 398 bus_space_handle_t ioh = sc->sc_ioh; 399 400 #if 0 401 if ((sc->sc_state & LPT_OPEN) == 0) 402 return 0; 403 #endif 404 405 /* is printer online and ready for output */ 406 if (NOT_READY() && NOT_READY_ERR()) 407 return 0; 408 409 if (sc->sc_count) { 410 u_char control = sc->sc_control; 411 /* send char */ 412 bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++); 413 DELAY(1); 414 bus_space_write_1(iot, ioh, lpt_control, control | LPC_STROBE); 415 DELAY(1); 416 sc->sc_count--; 417 bus_space_write_1(iot, ioh, lpt_control, control); 418 DELAY(1); 419 sc->sc_state |= LPT_OBUSY; 420 } else 421 sc->sc_state &= ~LPT_OBUSY; 422 423 if (sc->sc_count == 0) { 424 /* none, wake up the top half to get more */ 425 softint_schedule(sc->sc_sih); 426 } 427 428 return 1; 429 } 430 431 static void 432 lptsoftintr(void *cookie) 433 { 434 435 wakeup(cookie); 436 } 437 438 int 439 lptioctl(dev_t dev, u_long cmd, void *data, 440 int flag, struct lwp *l) 441 { 442 return ENODEV; 443 } 444
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