1 /* $NetBSD: lpt.c,v 1.63 2003/06/29 22:30:13 fvdl 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 1.63 2003/06/29 22:30:13 fvdl Exp $"); 58 59 #include <sys/param.h> 60 #include <sys/systm.h> 61 #include <sys/proc.h> 62 #include <sys/user.h> 63 #include <sys/malloc.h> 64 #include <sys/kernel.h> 65 #include <sys/ioctl.h> 66 #include <sys/uio.h> 67 #include <sys/device.h> 68 #include <sys/conf.h> 69 #include <sys/syslog.h> 70 71 #include <machine/bus.h> 72 #include <machine/intr.h> 73 74 #include <dev/ic/lptreg.h> 75 #include <dev/ic/lptvar.h> 76 77 #define TIMEOUT hz*16 /* wait up to 16 seconds for a ready */ 78 #define STEP hz/4 79 80 #define LPTPRI (PZERO+8) 81 #define LPT_BSIZE 1024 82 83 #define LPTDEBUG 84 85 #ifndef LPTDEBUG 86 #define LPRINTF(a) 87 #else 88 #define LPRINTF(a) if (lptdebug) printf a 89 int lptdebug = 0; 90 #endif 91 92 extern struct cfdriver lpt_cd; 93 94 dev_type_open(lptopen); 95 dev_type_close(lptclose); 96 dev_type_write(lptwrite); 97 dev_type_ioctl(lptioctl); 98 99 const struct cdevsw lpt_cdevsw = { 100 lptopen, lptclose, noread, lptwrite, lptioctl, 101 nostop, notty, nopoll, nommap, nokqfilter, 102 }; 103 104 #define LPTUNIT(s) (minor(s) & 0x1f) 105 #define LPTFLAGS(s) (minor(s) & 0xe0) 106 107 void 108 lpt_attach_subr(sc) 109 struct lpt_softc *sc; 110 { 111 bus_space_tag_t iot; 112 bus_space_handle_t ioh; 113 114 sc->sc_state = 0; 115 116 iot = sc->sc_iot; 117 ioh = sc->sc_ioh; 118 119 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 120 121 callout_init(&sc->sc_wakeup_ch); 122 123 sc->sc_dev_ok = 1; 124 } 125 126 /* 127 * Reset the printer, then wait until it's selected and not busy. 128 */ 129 int 130 lptopen(dev, flag, mode, p) 131 dev_t dev; 132 int flag; 133 int mode; 134 struct proc *p; 135 { 136 u_char flags = LPTFLAGS(dev); 137 struct lpt_softc *sc; 138 bus_space_tag_t iot; 139 bus_space_handle_t ioh; 140 u_char control; 141 int error; 142 int spin; 143 144 sc = device_lookup(&lpt_cd, LPTUNIT(dev)); 145 if (!sc || !sc->sc_dev_ok) 146 return ENXIO; 147 148 #if 0 /* XXX what to do? */ 149 if (sc->sc_irq == IRQUNK && (flags & LPT_NOINTR) == 0) 150 return ENXIO; 151 #endif 152 153 #ifdef DIAGNOSTIC 154 if (sc->sc_state) 155 printf("%s: stat=0x%x not zero\n", sc->sc_dev.dv_xname, 156 sc->sc_state); 157 #endif 158 159 if (sc->sc_state) 160 return EBUSY; 161 162 sc->sc_state = LPT_INIT; 163 sc->sc_flags = flags; 164 LPRINTF(("%s: open: flags=0x%x\n", sc->sc_dev.dv_xname, 165 (unsigned)flags)); 166 iot = sc->sc_iot; 167 ioh = sc->sc_ioh; 168 169 if ((flags & LPT_NOPRIME) == 0) { 170 /* assert INIT for 100 usec to start up printer */ 171 bus_space_write_1(iot, ioh, lpt_control, LPC_SELECT); 172 delay(100); 173 } 174 175 control = LPC_SELECT | LPC_NINIT; 176 bus_space_write_1(iot, ioh, lpt_control, control); 177 178 /* wait till ready (printer running diagnostics) */ 179 for (spin = 0; NOT_READY_ERR(); spin += STEP) { 180 if (spin >= TIMEOUT) { 181 sc->sc_state = 0; 182 return EBUSY; 183 } 184 185 /* wait 1/4 second, give up if we get a signal */ 186 error = tsleep((caddr_t)sc, LPTPRI | PCATCH, "lptopen", STEP); 187 if (error != EWOULDBLOCK) { 188 sc->sc_state = 0; 189 return error; 190 } 191 } 192 193 if ((flags & LPT_NOINTR) == 0) 194 control |= LPC_IENABLE; 195 if (flags & LPT_AUTOLF) 196 control |= LPC_AUTOLF; 197 sc->sc_control = control; 198 bus_space_write_1(iot, ioh, lpt_control, control); 199 200 sc->sc_inbuf = malloc(LPT_BSIZE, M_DEVBUF, M_WAITOK); 201 sc->sc_count = 0; 202 sc->sc_state = LPT_OPEN; 203 204 if ((sc->sc_flags & LPT_NOINTR) == 0) 205 lptwakeup(sc); 206 207 LPRINTF(("%s: opened\n", sc->sc_dev.dv_xname)); 208 return 0; 209 } 210 211 int 212 lptnotready(status, sc) 213 u_char status; 214 struct lpt_softc *sc; 215 { 216 u_char new; 217 218 status = (status ^ LPS_INVERT) & LPS_MASK; 219 new = status & ~sc->sc_laststatus; 220 sc->sc_laststatus = status; 221 222 if (sc->sc_state & LPT_OPEN) { 223 if (new & LPS_SELECT) 224 log(LOG_NOTICE, 225 "%s: offline\n", sc->sc_dev.dv_xname); 226 else if (new & LPS_NOPAPER) 227 log(LOG_NOTICE, 228 "%s: out of paper\n", sc->sc_dev.dv_xname); 229 else if (new & LPS_NERR) 230 log(LOG_NOTICE, 231 "%s: output error\n", sc->sc_dev.dv_xname); 232 } 233 234 return status; 235 } 236 237 void 238 lptwakeup(arg) 239 void *arg; 240 { 241 struct lpt_softc *sc = arg; 242 int s; 243 244 s = spllpt(); 245 lptintr(sc); 246 splx(s); 247 248 callout_reset(&sc->sc_wakeup_ch, STEP, lptwakeup, sc); 249 } 250 251 /* 252 * Close the device, and free the local line buffer. 253 */ 254 int 255 lptclose(dev, flag, mode, p) 256 dev_t dev; 257 int flag; 258 int mode; 259 struct proc *p; 260 { 261 struct lpt_softc *sc = device_lookup(&lpt_cd, LPTUNIT(dev)); 262 bus_space_tag_t iot = sc->sc_iot; 263 bus_space_handle_t ioh = sc->sc_ioh; 264 265 if (sc->sc_count) 266 (void) lptpushbytes(sc); 267 268 if ((sc->sc_flags & LPT_NOINTR) == 0) 269 callout_stop(&sc->sc_wakeup_ch); 270 271 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 272 sc->sc_state = 0; 273 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 274 free(sc->sc_inbuf, M_DEVBUF); 275 276 LPRINTF(("%s: closed\n", sc->sc_dev.dv_xname)); 277 return 0; 278 } 279 280 int 281 lptpushbytes(sc) 282 struct lpt_softc *sc; 283 { 284 bus_space_tag_t iot = sc->sc_iot; 285 bus_space_handle_t ioh = sc->sc_ioh; 286 int error; 287 288 if (sc->sc_flags & LPT_NOINTR) { 289 int spin, tic; 290 u_char control = sc->sc_control; 291 292 while (sc->sc_count > 0) { 293 spin = 0; 294 while (NOT_READY()) { 295 if (++spin < sc->sc_spinmax) 296 continue; 297 tic = 0; 298 /* adapt busy-wait algorithm */ 299 sc->sc_spinmax++; 300 while (NOT_READY_ERR()) { 301 /* exponential backoff */ 302 tic = tic + tic + 1; 303 if (tic > TIMEOUT) 304 tic = TIMEOUT; 305 error = tsleep((caddr_t)sc, 306 LPTPRI | PCATCH, "lptpsh", tic); 307 if (error != EWOULDBLOCK) 308 return error; 309 } 310 break; 311 } 312 313 bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++); 314 DELAY(1); 315 bus_space_write_1(iot, ioh, lpt_control, 316 control | LPC_STROBE); 317 DELAY(1); 318 sc->sc_count--; 319 bus_space_write_1(iot, ioh, lpt_control, control); 320 DELAY(1); 321 322 /* adapt busy-wait algorithm */ 323 if (spin*2 + 16 < sc->sc_spinmax) 324 sc->sc_spinmax--; 325 } 326 } else { 327 int s; 328 329 while (sc->sc_count > 0) { 330 /* if the printer is ready for a char, give it one */ 331 if ((sc->sc_state & LPT_OBUSY) == 0) { 332 LPRINTF(("%s: write %lu\n", sc->sc_dev.dv_xname, 333 (u_long)sc->sc_count)); 334 s = spllpt(); 335 (void) lptintr(sc); 336 splx(s); 337 } 338 error = tsleep((caddr_t)sc, LPTPRI | PCATCH, 339 "lptwrite2", 0); 340 if (error) 341 return error; 342 } 343 } 344 return 0; 345 } 346 347 /* 348 * Copy a line from user space to a local buffer, then call putc to get the 349 * chars moved to the output queue. 350 */ 351 int 352 lptwrite(dev, uio, flags) 353 dev_t dev; 354 struct uio *uio; 355 int flags; 356 { 357 struct lpt_softc *sc = device_lookup(&lpt_cd, LPTUNIT(dev)); 358 size_t n; 359 int error = 0; 360 361 while ((n = min(LPT_BSIZE, uio->uio_resid)) != 0) { 362 uiomove(sc->sc_cp = sc->sc_inbuf, n, uio); 363 sc->sc_count = n; 364 error = lptpushbytes(sc); 365 if (error) { 366 /* 367 * Return accurate residual if interrupted or timed 368 * out. 369 */ 370 uio->uio_resid += sc->sc_count; 371 sc->sc_count = 0; 372 return error; 373 } 374 } 375 return 0; 376 } 377 378 /* 379 * Handle printer interrupts which occur when the printer is ready to accept 380 * another char. 381 */ 382 int 383 lptintr(arg) 384 void *arg; 385 { 386 struct lpt_softc *sc = arg; 387 bus_space_tag_t iot = sc->sc_iot; 388 bus_space_handle_t ioh = sc->sc_ioh; 389 390 #if 0 391 if ((sc->sc_state & LPT_OPEN) == 0) 392 return 0; 393 #endif 394 395 /* is printer online and ready for output */ 396 if (NOT_READY() && NOT_READY_ERR()) 397 return 0; 398 399 if (sc->sc_count) { 400 u_char control = sc->sc_control; 401 /* send char */ 402 bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++); 403 DELAY(1); 404 bus_space_write_1(iot, ioh, lpt_control, control | LPC_STROBE); 405 DELAY(1); 406 sc->sc_count--; 407 bus_space_write_1(iot, ioh, lpt_control, control); 408 DELAY(1); 409 sc->sc_state |= LPT_OBUSY; 410 } else 411 sc->sc_state &= ~LPT_OBUSY; 412 413 if (sc->sc_count == 0) { 414 /* none, wake up the top half to get more */ 415 wakeup((caddr_t)sc); 416 } 417 418 return 1; 419 } 420 421 int 422 lptioctl(dev, cmd, data, flag, p) 423 dev_t dev; 424 u_long cmd; 425 caddr_t data; 426 int flag; 427 struct proc *p; 428 { 429 int error = 0; 430 431 switch (cmd) { 432 default: 433 error = ENODEV; 434 } 435 436 return error; 437 } 438