lpt.c revision 1.49
1 /* $NetBSD: lpt.c,v 1.49 1998/02/02 22:55:03 cgd Exp $ */ 2 3 /* 4 * Copyright (c) 1993, 1994 Charles 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 (new & LPS_SELECT) 214 log(LOG_NOTICE, "%s: offline\n", sc->sc_dev.dv_xname); 215 else if (new & LPS_NOPAPER) 216 log(LOG_NOTICE, "%s: out of paper\n", sc->sc_dev.dv_xname); 217 else if (new & LPS_NERR) 218 log(LOG_NOTICE, "%s: output error\n", sc->sc_dev.dv_xname); 219 220 return status; 221 } 222 223 void 224 lptwakeup(arg) 225 void *arg; 226 { 227 struct lpt_softc *sc = arg; 228 int s; 229 230 s = spltty(); 231 lptintr(sc); 232 splx(s); 233 234 timeout(lptwakeup, sc, STEP); 235 } 236 237 /* 238 * Close the device, and free the local line buffer. 239 */ 240 int 241 lptclose(dev, flag, mode, p) 242 dev_t dev; 243 int flag; 244 int mode; 245 struct proc *p; 246 { 247 int unit = LPTUNIT(dev); 248 struct lpt_softc *sc = lpt_cd.cd_devs[unit]; 249 bus_space_tag_t iot = sc->sc_iot; 250 bus_space_handle_t ioh = sc->sc_ioh; 251 252 if (sc->sc_count) 253 (void) lptpushbytes(sc); 254 255 if ((sc->sc_flags & LPT_NOINTR) == 0) 256 untimeout(lptwakeup, sc); 257 258 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 259 sc->sc_state = 0; 260 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 261 free(sc->sc_inbuf, M_DEVBUF); 262 263 LPRINTF(("%s: closed\n", sc->sc_dev.dv_xname)); 264 return 0; 265 } 266 267 int 268 lptpushbytes(sc) 269 struct lpt_softc *sc; 270 { 271 bus_space_tag_t iot = sc->sc_iot; 272 bus_space_handle_t ioh = sc->sc_ioh; 273 int error; 274 275 if (sc->sc_flags & LPT_NOINTR) { 276 int spin, tic; 277 u_char control = sc->sc_control; 278 279 while (sc->sc_count > 0) { 280 spin = 0; 281 while (NOT_READY()) { 282 if (++spin < sc->sc_spinmax) 283 continue; 284 tic = 0; 285 /* adapt busy-wait algorithm */ 286 sc->sc_spinmax++; 287 while (NOT_READY_ERR()) { 288 /* exponential backoff */ 289 tic = tic + tic + 1; 290 if (tic > TIMEOUT) 291 tic = TIMEOUT; 292 error = tsleep((caddr_t)sc, 293 LPTPRI | PCATCH, "lptpsh", tic); 294 if (error != EWOULDBLOCK) 295 return error; 296 } 297 break; 298 } 299 300 bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++); 301 bus_space_write_1(iot, ioh, lpt_control, 302 control | LPC_STROBE); 303 sc->sc_count--; 304 bus_space_write_1(iot, ioh, lpt_control, control); 305 306 /* adapt busy-wait algorithm */ 307 if (spin*2 + 16 < sc->sc_spinmax) 308 sc->sc_spinmax--; 309 } 310 } else { 311 int s; 312 313 while (sc->sc_count > 0) { 314 /* if the printer is ready for a char, give it one */ 315 if ((sc->sc_state & LPT_OBUSY) == 0) { 316 LPRINTF(("%s: write %u\n", sc->sc_dev.dv_xname, 317 sc->sc_count)); 318 s = spltty(); 319 (void) lptintr(sc); 320 splx(s); 321 } 322 error = tsleep((caddr_t)sc, LPTPRI | PCATCH, 323 "lptwrite2", 0); 324 if (error) 325 return error; 326 } 327 } 328 return 0; 329 } 330 331 /* 332 * Copy a line from user space to a local buffer, then call putc to get the 333 * chars moved to the output queue. 334 */ 335 int 336 lptwrite(dev, uio, flags) 337 dev_t dev; 338 struct uio *uio; 339 int flags; 340 { 341 struct lpt_softc *sc = lpt_cd.cd_devs[LPTUNIT(dev)]; 342 size_t n; 343 int error = 0; 344 345 while ((n = min(LPT_BSIZE, uio->uio_resid)) != 0) { 346 uiomove(sc->sc_cp = sc->sc_inbuf, n, uio); 347 sc->sc_count = n; 348 error = lptpushbytes(sc); 349 if (error) { 350 /* 351 * Return accurate residual if interrupted or timed 352 * out. 353 */ 354 uio->uio_resid += sc->sc_count; 355 sc->sc_count = 0; 356 return error; 357 } 358 } 359 return 0; 360 } 361 362 /* 363 * Handle printer interrupts which occur when the printer is ready to accept 364 * another char. 365 */ 366 int 367 lptintr(arg) 368 void *arg; 369 { 370 struct lpt_softc *sc = arg; 371 bus_space_tag_t iot = sc->sc_iot; 372 bus_space_handle_t ioh = sc->sc_ioh; 373 374 #if 0 375 if ((sc->sc_state & LPT_OPEN) == 0) 376 return 0; 377 #endif 378 379 /* is printer online and ready for output */ 380 if (NOT_READY() && NOT_READY_ERR()) 381 return 0; 382 383 if (sc->sc_count) { 384 u_char control = sc->sc_control; 385 /* send char */ 386 bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++); 387 bus_space_write_1(iot, ioh, lpt_control, control | LPC_STROBE); 388 sc->sc_count--; 389 bus_space_write_1(iot, ioh, lpt_control, control); 390 sc->sc_state |= LPT_OBUSY; 391 } else 392 sc->sc_state &= ~LPT_OBUSY; 393 394 if (sc->sc_count == 0) { 395 /* none, wake up the top half to get more */ 396 wakeup((caddr_t)sc); 397 } 398 399 return 1; 400 } 401 402 int 403 lptioctl(dev, cmd, data, flag, p) 404 dev_t dev; 405 u_long cmd; 406 caddr_t data; 407 int flag; 408 struct proc *p; 409 { 410 int error = 0; 411 412 switch (cmd) { 413 default: 414 error = ENODEV; 415 } 416 417 return error; 418 } 419
Indexes created Mon Sep 22 05:09:51 GMT 2025