lpt.c revision 1.48
1 /* $NetBSD: lpt.c,v 1.48 1998/01/12 09:23:29 thorpej 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 } 111 112 /* 113 * Reset the printer, then wait until it's selected and not busy. 114 */ 115 int 116 lptopen(dev, flag, mode, p) 117 dev_t dev; 118 int flag; 119 int mode; 120 struct proc *p; 121 { 122 int unit = LPTUNIT(dev); 123 u_char flags = LPTFLAGS(dev); 124 struct lpt_softc *sc; 125 bus_space_tag_t iot; 126 bus_space_handle_t ioh; 127 u_char control; 128 int error; 129 int spin; 130 131 if (unit >= lpt_cd.cd_ndevs) 132 return ENXIO; 133 sc = lpt_cd.cd_devs[unit]; 134 if (!sc) 135 return ENXIO; 136 137 #if 0 /* XXX what to do? */ 138 if (sc->sc_irq == IRQUNK && (flags & LPT_NOINTR) == 0) 139 return ENXIO; 140 #endif 141 142 #ifdef DIAGNOSTIC 143 if (sc->sc_state) 144 printf("%s: stat=0x%x not zero\n", sc->sc_dev.dv_xname, 145 sc->sc_state); 146 #endif 147 148 if (sc->sc_state) 149 return EBUSY; 150 151 sc->sc_state = LPT_INIT; 152 sc->sc_flags = flags; 153 LPRINTF(("%s: open: flags=0x%x\n", sc->sc_dev.dv_xname, 154 (unsigned)flags)); 155 iot = sc->sc_iot; 156 ioh = sc->sc_ioh; 157 158 if ((flags & LPT_NOPRIME) == 0) { 159 /* assert INIT for 100 usec to start up printer */ 160 bus_space_write_1(iot, ioh, lpt_control, LPC_SELECT); 161 delay(100); 162 } 163 164 control = LPC_SELECT | LPC_NINIT; 165 bus_space_write_1(iot, ioh, lpt_control, control); 166 167 /* wait till ready (printer running diagnostics) */ 168 for (spin = 0; NOT_READY_ERR(); spin += STEP) { 169 if (spin >= TIMEOUT) { 170 sc->sc_state = 0; 171 return EBUSY; 172 } 173 174 /* wait 1/4 second, give up if we get a signal */ 175 error = tsleep((caddr_t)sc, LPTPRI | PCATCH, "lptopen", STEP); 176 if (error != EWOULDBLOCK) { 177 sc->sc_state = 0; 178 return error; 179 } 180 } 181 182 if ((flags & LPT_NOINTR) == 0) 183 control |= LPC_IENABLE; 184 if (flags & LPT_AUTOLF) 185 control |= LPC_AUTOLF; 186 sc->sc_control = control; 187 bus_space_write_1(iot, ioh, lpt_control, control); 188 189 sc->sc_inbuf = malloc(LPT_BSIZE, M_DEVBUF, M_WAITOK); 190 sc->sc_count = 0; 191 sc->sc_state = LPT_OPEN; 192 193 if ((sc->sc_flags & LPT_NOINTR) == 0) 194 lptwakeup(sc); 195 196 LPRINTF(("%s: opened\n", sc->sc_dev.dv_xname)); 197 return 0; 198 } 199 200 int 201 lptnotready(status, sc) 202 u_char status; 203 struct lpt_softc *sc; 204 { 205 u_char new; 206 207 status = (status ^ LPS_INVERT) & LPS_MASK; 208 new = status & ~sc->sc_laststatus; 209 sc->sc_laststatus = status; 210 211 if (new & LPS_SELECT) 212 log(LOG_NOTICE, "%s: offline\n", sc->sc_dev.dv_xname); 213 else if (new & LPS_NOPAPER) 214 log(LOG_NOTICE, "%s: out of paper\n", sc->sc_dev.dv_xname); 215 else if (new & LPS_NERR) 216 log(LOG_NOTICE, "%s: output error\n", sc->sc_dev.dv_xname); 217 218 return status; 219 } 220 221 void 222 lptwakeup(arg) 223 void *arg; 224 { 225 struct lpt_softc *sc = arg; 226 int s; 227 228 s = spltty(); 229 lptintr(sc); 230 splx(s); 231 232 timeout(lptwakeup, sc, STEP); 233 } 234 235 /* 236 * Close the device, and free the local line buffer. 237 */ 238 int 239 lptclose(dev, flag, mode, p) 240 dev_t dev; 241 int flag; 242 int mode; 243 struct proc *p; 244 { 245 int unit = LPTUNIT(dev); 246 struct lpt_softc *sc = lpt_cd.cd_devs[unit]; 247 bus_space_tag_t iot = sc->sc_iot; 248 bus_space_handle_t ioh = sc->sc_ioh; 249 250 if (sc->sc_count) 251 (void) lptpushbytes(sc); 252 253 if ((sc->sc_flags & LPT_NOINTR) == 0) 254 untimeout(lptwakeup, sc); 255 256 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 257 sc->sc_state = 0; 258 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 259 free(sc->sc_inbuf, M_DEVBUF); 260 261 LPRINTF(("%s: closed\n", sc->sc_dev.dv_xname)); 262 return 0; 263 } 264 265 int 266 lptpushbytes(sc) 267 struct lpt_softc *sc; 268 { 269 bus_space_tag_t iot = sc->sc_iot; 270 bus_space_handle_t ioh = sc->sc_ioh; 271 int error; 272 273 if (sc->sc_flags & LPT_NOINTR) { 274 int spin, tic; 275 u_char control = sc->sc_control; 276 277 while (sc->sc_count > 0) { 278 spin = 0; 279 while (NOT_READY()) { 280 if (++spin < sc->sc_spinmax) 281 continue; 282 tic = 0; 283 /* adapt busy-wait algorithm */ 284 sc->sc_spinmax++; 285 while (NOT_READY_ERR()) { 286 /* exponential backoff */ 287 tic = tic + tic + 1; 288 if (tic > TIMEOUT) 289 tic = TIMEOUT; 290 error = tsleep((caddr_t)sc, 291 LPTPRI | PCATCH, "lptpsh", tic); 292 if (error != EWOULDBLOCK) 293 return error; 294 } 295 break; 296 } 297 298 bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++); 299 bus_space_write_1(iot, ioh, lpt_control, 300 control | LPC_STROBE); 301 sc->sc_count--; 302 bus_space_write_1(iot, ioh, lpt_control, control); 303 304 /* adapt busy-wait algorithm */ 305 if (spin*2 + 16 < sc->sc_spinmax) 306 sc->sc_spinmax--; 307 } 308 } else { 309 int s; 310 311 while (sc->sc_count > 0) { 312 /* if the printer is ready for a char, give it one */ 313 if ((sc->sc_state & LPT_OBUSY) == 0) { 314 LPRINTF(("%s: write %u\n", sc->sc_dev.dv_xname, 315 sc->sc_count)); 316 s = spltty(); 317 (void) lptintr(sc); 318 splx(s); 319 } 320 error = tsleep((caddr_t)sc, LPTPRI | PCATCH, 321 "lptwrite2", 0); 322 if (error) 323 return error; 324 } 325 } 326 return 0; 327 } 328 329 /* 330 * Copy a line from user space to a local buffer, then call putc to get the 331 * chars moved to the output queue. 332 */ 333 int 334 lptwrite(dev, uio, flags) 335 dev_t dev; 336 struct uio *uio; 337 int flags; 338 { 339 struct lpt_softc *sc = lpt_cd.cd_devs[LPTUNIT(dev)]; 340 size_t n; 341 int error = 0; 342 343 while ((n = min(LPT_BSIZE, uio->uio_resid)) != 0) { 344 uiomove(sc->sc_cp = sc->sc_inbuf, n, uio); 345 sc->sc_count = n; 346 error = lptpushbytes(sc); 347 if (error) { 348 /* 349 * Return accurate residual if interrupted or timed 350 * out. 351 */ 352 uio->uio_resid += sc->sc_count; 353 sc->sc_count = 0; 354 return error; 355 } 356 } 357 return 0; 358 } 359 360 /* 361 * Handle printer interrupts which occur when the printer is ready to accept 362 * another char. 363 */ 364 int 365 lptintr(arg) 366 void *arg; 367 { 368 struct lpt_softc *sc = arg; 369 bus_space_tag_t iot = sc->sc_iot; 370 bus_space_handle_t ioh = sc->sc_ioh; 371 372 #if 0 373 if ((sc->sc_state & LPT_OPEN) == 0) 374 return 0; 375 #endif 376 377 /* is printer online and ready for output */ 378 if (NOT_READY() && NOT_READY_ERR()) 379 return 0; 380 381 if (sc->sc_count) { 382 u_char control = sc->sc_control; 383 /* send char */ 384 bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++); 385 bus_space_write_1(iot, ioh, lpt_control, control | LPC_STROBE); 386 sc->sc_count--; 387 bus_space_write_1(iot, ioh, lpt_control, control); 388 sc->sc_state |= LPT_OBUSY; 389 } else 390 sc->sc_state &= ~LPT_OBUSY; 391 392 if (sc->sc_count == 0) { 393 /* none, wake up the top half to get more */ 394 wakeup((caddr_t)sc); 395 } 396 397 return 1; 398 } 399 400 int 401 lptioctl(dev, cmd, data, flag, p) 402 dev_t dev; 403 u_long cmd; 404 caddr_t data; 405 int flag; 406 struct proc *p; 407 { 408 int error = 0; 409 410 switch (cmd) { 411 default: 412 error = ENODEV; 413 } 414 415 return error; 416 } 417
Indexes created Tue Sep 23 07:09:52 GMT 2025