lpt.c revision 1.52
1 /* $NetBSD: lpt.c,v 1.52 1998/10/14 20:09:06 perry 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 sc->sc_dev_ok = 1; 112 } 113 114 /* 115 * Reset the printer, then wait until it's selected and not busy. 116 */ 117 int 118 lptopen(dev, flag, mode, p) 119 dev_t dev; 120 int flag; 121 int mode; 122 struct proc *p; 123 { 124 int unit = LPTUNIT(dev); 125 u_char flags = LPTFLAGS(dev); 126 struct lpt_softc *sc; 127 bus_space_tag_t iot; 128 bus_space_handle_t ioh; 129 u_char control; 130 int error; 131 int spin; 132 133 if (unit >= lpt_cd.cd_ndevs) 134 return ENXIO; 135 sc = lpt_cd.cd_devs[unit]; 136 if (!sc || !sc->sc_dev_ok) 137 return ENXIO; 138 139 #if 0 /* XXX what to do? */ 140 if (sc->sc_irq == IRQUNK && (flags & LPT_NOINTR) == 0) 141 return ENXIO; 142 #endif 143 144 #ifdef DIAGNOSTIC 145 if (sc->sc_state) 146 printf("%s: stat=0x%x not zero\n", sc->sc_dev.dv_xname, 147 sc->sc_state); 148 #endif 149 150 if (sc->sc_state) 151 return EBUSY; 152 153 sc->sc_state = LPT_INIT; 154 sc->sc_flags = flags; 155 LPRINTF(("%s: open: flags=0x%x\n", sc->sc_dev.dv_xname, 156 (unsigned)flags)); 157 iot = sc->sc_iot; 158 ioh = sc->sc_ioh; 159 160 if ((flags & LPT_NOPRIME) == 0) { 161 /* assert INIT for 100 usec to start up printer */ 162 bus_space_write_1(iot, ioh, lpt_control, LPC_SELECT); 163 delay(100); 164 } 165 166 control = LPC_SELECT | LPC_NINIT; 167 bus_space_write_1(iot, ioh, lpt_control, control); 168 169 /* wait till ready (printer running diagnostics) */ 170 for (spin = 0; NOT_READY_ERR(); spin += STEP) { 171 if (spin >= TIMEOUT) { 172 sc->sc_state = 0; 173 return EBUSY; 174 } 175 176 /* wait 1/4 second, give up if we get a signal */ 177 error = tsleep((caddr_t)sc, LPTPRI | PCATCH, "lptopen", STEP); 178 if (error != EWOULDBLOCK) { 179 sc->sc_state = 0; 180 return error; 181 } 182 } 183 184 if ((flags & LPT_NOINTR) == 0) 185 control |= LPC_IENABLE; 186 if (flags & LPT_AUTOLF) 187 control |= LPC_AUTOLF; 188 sc->sc_control = control; 189 bus_space_write_1(iot, ioh, lpt_control, control); 190 191 sc->sc_inbuf = malloc(LPT_BSIZE, M_DEVBUF, M_WAITOK); 192 sc->sc_count = 0; 193 sc->sc_state = LPT_OPEN; 194 195 if ((sc->sc_flags & LPT_NOINTR) == 0) 196 lptwakeup(sc); 197 198 LPRINTF(("%s: opened\n", sc->sc_dev.dv_xname)); 199 return 0; 200 } 201 202 int 203 lptnotready(status, sc) 204 u_char status; 205 struct lpt_softc *sc; 206 { 207 u_char new; 208 209 status = (status ^ LPS_INVERT) & LPS_MASK; 210 new = status & ~sc->sc_laststatus; 211 sc->sc_laststatus = status; 212 213 if (sc->sc_state & LPT_OPEN) { 214 if (new & LPS_SELECT) 215 log(LOG_NOTICE, 216 "%s: offline\n", sc->sc_dev.dv_xname); 217 else if (new & LPS_NOPAPER) 218 log(LOG_NOTICE, 219 "%s: out of paper\n", sc->sc_dev.dv_xname); 220 else if (new & LPS_NERR) 221 log(LOG_NOTICE, 222 "%s: output error\n", sc->sc_dev.dv_xname); 223 } 224 225 return status; 226 } 227 228 void 229 lptwakeup(arg) 230 void *arg; 231 { 232 struct lpt_softc *sc = arg; 233 int s; 234 235 s = spllpt(); 236 lptintr(sc); 237 splx(s); 238 239 timeout(lptwakeup, sc, STEP); 240 } 241 242 /* 243 * Close the device, and free the local line buffer. 244 */ 245 int 246 lptclose(dev, flag, mode, p) 247 dev_t dev; 248 int flag; 249 int mode; 250 struct proc *p; 251 { 252 int unit = LPTUNIT(dev); 253 struct lpt_softc *sc = lpt_cd.cd_devs[unit]; 254 bus_space_tag_t iot = sc->sc_iot; 255 bus_space_handle_t ioh = sc->sc_ioh; 256 257 if (sc->sc_count) 258 (void) lptpushbytes(sc); 259 260 if ((sc->sc_flags & LPT_NOINTR) == 0) 261 untimeout(lptwakeup, sc); 262 263 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 264 sc->sc_state = 0; 265 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 266 free(sc->sc_inbuf, M_DEVBUF); 267 268 LPRINTF(("%s: closed\n", sc->sc_dev.dv_xname)); 269 return 0; 270 } 271 272 int 273 lptpushbytes(sc) 274 struct lpt_softc *sc; 275 { 276 bus_space_tag_t iot = sc->sc_iot; 277 bus_space_handle_t ioh = sc->sc_ioh; 278 int error; 279 280 if (sc->sc_flags & LPT_NOINTR) { 281 int spin, tic; 282 u_char control = sc->sc_control; 283 284 while (sc->sc_count > 0) { 285 spin = 0; 286 while (NOT_READY()) { 287 if (++spin < sc->sc_spinmax) 288 continue; 289 tic = 0; 290 /* adapt busy-wait algorithm */ 291 sc->sc_spinmax++; 292 while (NOT_READY_ERR()) { 293 /* exponential backoff */ 294 tic = tic + tic + 1; 295 if (tic > TIMEOUT) 296 tic = TIMEOUT; 297 error = tsleep((caddr_t)sc, 298 LPTPRI | PCATCH, "lptpsh", tic); 299 if (error != EWOULDBLOCK) 300 return error; 301 } 302 break; 303 } 304 305 bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++); 306 bus_space_write_1(iot, ioh, lpt_control, 307 control | LPC_STROBE); 308 sc->sc_count--; 309 bus_space_write_1(iot, ioh, lpt_control, control); 310 311 /* adapt busy-wait algorithm */ 312 if (spin*2 + 16 < sc->sc_spinmax) 313 sc->sc_spinmax--; 314 } 315 } else { 316 int s; 317 318 while (sc->sc_count > 0) { 319 /* if the printer is ready for a char, give it one */ 320 if ((sc->sc_state & LPT_OBUSY) == 0) { 321 LPRINTF(("%s: write %u\n", sc->sc_dev.dv_xname, 322 sc->sc_count)); 323 s = spllpt(); 324 (void) lptintr(sc); 325 splx(s); 326 } 327 error = tsleep((caddr_t)sc, LPTPRI | PCATCH, 328 "lptwrite2", 0); 329 if (error) 330 return error; 331 } 332 } 333 return 0; 334 } 335 336 /* 337 * Copy a line from user space to a local buffer, then call putc to get the 338 * chars moved to the output queue. 339 */ 340 int 341 lptwrite(dev, uio, flags) 342 dev_t dev; 343 struct uio *uio; 344 int flags; 345 { 346 struct lpt_softc *sc = lpt_cd.cd_devs[LPTUNIT(dev)]; 347 size_t n; 348 int error = 0; 349 350 while ((n = min(LPT_BSIZE, uio->uio_resid)) != 0) { 351 uiomove(sc->sc_cp = sc->sc_inbuf, n, uio); 352 sc->sc_count = n; 353 error = lptpushbytes(sc); 354 if (error) { 355 /* 356 * Return accurate residual if interrupted or timed 357 * out. 358 */ 359 uio->uio_resid += sc->sc_count; 360 sc->sc_count = 0; 361 return error; 362 } 363 } 364 return 0; 365 } 366 367 /* 368 * Handle printer interrupts which occur when the printer is ready to accept 369 * another char. 370 */ 371 int 372 lptintr(arg) 373 void *arg; 374 { 375 struct lpt_softc *sc = arg; 376 bus_space_tag_t iot = sc->sc_iot; 377 bus_space_handle_t ioh = sc->sc_ioh; 378 379 #if 0 380 if ((sc->sc_state & LPT_OPEN) == 0) 381 return 0; 382 #endif 383 384 /* is printer online and ready for output */ 385 if (NOT_READY() && NOT_READY_ERR()) 386 return 0; 387 388 if (sc->sc_count) { 389 u_char control = sc->sc_control; 390 /* send char */ 391 bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++); 392 bus_space_write_1(iot, ioh, lpt_control, control | LPC_STROBE); 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 10:09:38 GMT 2025