lpt.c revision 1.57
1 /* $NetBSD: lpt.c,v 1.57 2000/07/06 01:47:37 thorpej 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/param.h> 57 #include <sys/systm.h> 58 #include <sys/proc.h> 59 #include <sys/user.h> 60 #include <sys/malloc.h> 61 #include <sys/kernel.h> 62 #include <sys/ioctl.h> 63 #include <sys/uio.h> 64 #include <sys/device.h> 65 #include <sys/conf.h> 66 #include <sys/syslog.h> 67 68 #include <machine/bus.h> 69 #include <machine/intr.h> 70 71 #include <dev/ic/lptreg.h> 72 #include <dev/ic/lptvar.h> 73 74 #define TIMEOUT hz*16 /* wait up to 16 seconds for a ready */ 75 #define STEP hz/4 76 77 #define LPTPRI (PZERO+8) 78 #define LPT_BSIZE 1024 79 80 #define LPTDEBUG 81 82 #ifndef LPTDEBUG 83 #define LPRINTF(a) 84 #else 85 #define LPRINTF(a) if (lptdebug) printf a 86 int lptdebug = 0; 87 #endif 88 89 /* XXX does not belong here */ 90 cdev_decl(lpt); 91 92 extern struct cfdriver lpt_cd; 93 94 #define LPTUNIT(s) (minor(s) & 0x1f) 95 #define LPTFLAGS(s) (minor(s) & 0xe0) 96 97 void 98 lpt_attach_subr(sc) 99 struct lpt_softc *sc; 100 { 101 bus_space_tag_t iot; 102 bus_space_handle_t ioh; 103 104 sc->sc_state = 0; 105 106 iot = sc->sc_iot; 107 ioh = sc->sc_ioh; 108 109 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 110 111 callout_init(&sc->sc_wakeup_ch); 112 113 sc->sc_dev_ok = 1; 114 } 115 116 /* 117 * Reset the printer, then wait until it's selected and not busy. 118 */ 119 int 120 lptopen(dev, flag, mode, p) 121 dev_t dev; 122 int flag; 123 int mode; 124 struct proc *p; 125 { 126 u_char flags = LPTFLAGS(dev); 127 struct lpt_softc *sc; 128 bus_space_tag_t iot; 129 bus_space_handle_t ioh; 130 u_char control; 131 int error; 132 int spin; 133 134 sc = device_lookup(&lpt_cd, LPTUNIT(dev)); 135 if (!sc || !sc->sc_dev_ok) 136 return ENXIO; 137 138 #if 0 /* XXX what to do? */ 139 if (sc->sc_irq == IRQUNK && (flags & LPT_NOINTR) == 0) 140 return ENXIO; 141 #endif 142 143 #ifdef DIAGNOSTIC 144 if (sc->sc_state) 145 printf("%s: stat=0x%x not zero\n", sc->sc_dev.dv_xname, 146 sc->sc_state); 147 #endif 148 149 if (sc->sc_state) 150 return EBUSY; 151 152 sc->sc_state = LPT_INIT; 153 sc->sc_flags = flags; 154 LPRINTF(("%s: open: flags=0x%x\n", sc->sc_dev.dv_xname, 155 (unsigned)flags)); 156 iot = sc->sc_iot; 157 ioh = sc->sc_ioh; 158 159 if ((flags & LPT_NOPRIME) == 0) { 160 /* assert INIT for 100 usec to start up printer */ 161 bus_space_write_1(iot, ioh, lpt_control, LPC_SELECT); 162 delay(100); 163 } 164 165 control = LPC_SELECT | LPC_NINIT; 166 bus_space_write_1(iot, ioh, lpt_control, control); 167 168 /* wait till ready (printer running diagnostics) */ 169 for (spin = 0; NOT_READY_ERR(); spin += STEP) { 170 if (spin >= TIMEOUT) { 171 sc->sc_state = 0; 172 return EBUSY; 173 } 174 175 /* wait 1/4 second, give up if we get a signal */ 176 error = tsleep((caddr_t)sc, LPTPRI | PCATCH, "lptopen", STEP); 177 if (error != EWOULDBLOCK) { 178 sc->sc_state = 0; 179 return error; 180 } 181 } 182 183 if ((flags & LPT_NOINTR) == 0) 184 control |= LPC_IENABLE; 185 if (flags & LPT_AUTOLF) 186 control |= LPC_AUTOLF; 187 sc->sc_control = control; 188 bus_space_write_1(iot, ioh, lpt_control, control); 189 190 sc->sc_inbuf = malloc(LPT_BSIZE, M_DEVBUF, M_WAITOK); 191 sc->sc_count = 0; 192 sc->sc_state = LPT_OPEN; 193 194 if ((sc->sc_flags & LPT_NOINTR) == 0) 195 lptwakeup(sc); 196 197 LPRINTF(("%s: opened\n", sc->sc_dev.dv_xname)); 198 return 0; 199 } 200 201 int 202 lptnotready(status, sc) 203 u_char status; 204 struct lpt_softc *sc; 205 { 206 u_char new; 207 208 status = (status ^ LPS_INVERT) & LPS_MASK; 209 new = status & ~sc->sc_laststatus; 210 sc->sc_laststatus = status; 211 212 if (sc->sc_state & LPT_OPEN) { 213 if (new & LPS_SELECT) 214 log(LOG_NOTICE, 215 "%s: offline\n", sc->sc_dev.dv_xname); 216 else if (new & LPS_NOPAPER) 217 log(LOG_NOTICE, 218 "%s: out of paper\n", sc->sc_dev.dv_xname); 219 else if (new & LPS_NERR) 220 log(LOG_NOTICE, 221 "%s: output error\n", sc->sc_dev.dv_xname); 222 } 223 224 return status; 225 } 226 227 void 228 lptwakeup(arg) 229 void *arg; 230 { 231 struct lpt_softc *sc = arg; 232 int s; 233 234 s = spllpt(); 235 lptintr(sc); 236 splx(s); 237 238 callout_reset(&sc->sc_wakeup_ch, STEP, lptwakeup, sc); 239 } 240 241 /* 242 * Close the device, and free the local line buffer. 243 */ 244 int 245 lptclose(dev, flag, mode, p) 246 dev_t dev; 247 int flag; 248 int mode; 249 struct proc *p; 250 { 251 struct lpt_softc *sc = device_lookup(&lpt_cd, LPTUNIT(dev)); 252 bus_space_tag_t iot = sc->sc_iot; 253 bus_space_handle_t ioh = sc->sc_ioh; 254 255 if (sc->sc_count) 256 (void) lptpushbytes(sc); 257 258 if ((sc->sc_flags & LPT_NOINTR) == 0) 259 callout_stop(&sc->sc_wakeup_ch); 260 261 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 262 sc->sc_state = 0; 263 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 264 free(sc->sc_inbuf, M_DEVBUF); 265 266 LPRINTF(("%s: closed\n", sc->sc_dev.dv_xname)); 267 return 0; 268 } 269 270 int 271 lptpushbytes(sc) 272 struct lpt_softc *sc; 273 { 274 bus_space_tag_t iot = sc->sc_iot; 275 bus_space_handle_t ioh = sc->sc_ioh; 276 int error; 277 278 if (sc->sc_flags & LPT_NOINTR) { 279 int spin, tic; 280 u_char control = sc->sc_control; 281 282 while (sc->sc_count > 0) { 283 spin = 0; 284 while (NOT_READY()) { 285 if (++spin < sc->sc_spinmax) 286 continue; 287 tic = 0; 288 /* adapt busy-wait algorithm */ 289 sc->sc_spinmax++; 290 while (NOT_READY_ERR()) { 291 /* exponential backoff */ 292 tic = tic + tic + 1; 293 if (tic > TIMEOUT) 294 tic = TIMEOUT; 295 error = tsleep((caddr_t)sc, 296 LPTPRI | PCATCH, "lptpsh", tic); 297 if (error != EWOULDBLOCK) 298 return error; 299 } 300 break; 301 } 302 303 bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++); 304 bus_space_write_1(iot, ioh, lpt_control, 305 control | LPC_STROBE); 306 sc->sc_count--; 307 bus_space_write_1(iot, ioh, lpt_control, control); 308 309 /* adapt busy-wait algorithm */ 310 if (spin*2 + 16 < sc->sc_spinmax) 311 sc->sc_spinmax--; 312 } 313 } else { 314 int s; 315 316 while (sc->sc_count > 0) { 317 /* if the printer is ready for a char, give it one */ 318 if ((sc->sc_state & LPT_OBUSY) == 0) { 319 LPRINTF(("%s: write %lu\n", sc->sc_dev.dv_xname, 320 (u_long)sc->sc_count)); 321 s = spllpt(); 322 (void) lptintr(sc); 323 splx(s); 324 } 325 error = tsleep((caddr_t)sc, LPTPRI | PCATCH, 326 "lptwrite2", 0); 327 if (error) 328 return error; 329 } 330 } 331 return 0; 332 } 333 334 /* 335 * Copy a line from user space to a local buffer, then call putc to get the 336 * chars moved to the output queue. 337 */ 338 int 339 lptwrite(dev, uio, flags) 340 dev_t dev; 341 struct uio *uio; 342 int flags; 343 { 344 struct lpt_softc *sc = device_lookup(&lpt_cd, LPTUNIT(dev)); 345 size_t n; 346 int error = 0; 347 348 while ((n = min(LPT_BSIZE, uio->uio_resid)) != 0) { 349 uiomove(sc->sc_cp = sc->sc_inbuf, n, uio); 350 sc->sc_count = n; 351 error = lptpushbytes(sc); 352 if (error) { 353 /* 354 * Return accurate residual if interrupted or timed 355 * out. 356 */ 357 uio->uio_resid += sc->sc_count; 358 sc->sc_count = 0; 359 return error; 360 } 361 } 362 return 0; 363 } 364 365 /* 366 * Handle printer interrupts which occur when the printer is ready to accept 367 * another char. 368 */ 369 int 370 lptintr(arg) 371 void *arg; 372 { 373 struct lpt_softc *sc = arg; 374 bus_space_tag_t iot = sc->sc_iot; 375 bus_space_handle_t ioh = sc->sc_ioh; 376 377 #if 0 378 if ((sc->sc_state & LPT_OPEN) == 0) 379 return 0; 380 #endif 381 382 /* is printer online and ready for output */ 383 if (NOT_READY() && NOT_READY_ERR()) 384 return 0; 385 386 if (sc->sc_count) { 387 u_char control = sc->sc_control; 388 /* send char */ 389 bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++); 390 DELAY(1); 391 bus_space_write_1(iot, ioh, lpt_control, control | LPC_STROBE); 392 DELAY(1); 393 sc->sc_count--; 394 bus_space_write_1(iot, ioh, lpt_control, control); 395 sc->sc_state |= LPT_OBUSY; 396 } else 397 sc->sc_state &= ~LPT_OBUSY; 398 399 if (sc->sc_count == 0) { 400 /* none, wake up the top half to get more */ 401 wakeup((caddr_t)sc); 402 } 403 404 return 1; 405 } 406 407 int 408 lptioctl(dev, cmd, data, flag, p) 409 dev_t dev; 410 u_long cmd; 411 caddr_t data; 412 int flag; 413 struct proc *p; 414 { 415 int error = 0; 416 417 switch (cmd) { 418 default: 419 error = ENODEV; 420 } 421 422 return error; 423 } 424
Indexes created Mon Sep 22 21:09:42 GMT 2025