lpt.c revision 1.45
1 /* $NetBSD: lpt.c,v 1.45 1997/09/27 22:44:15 is 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/buf.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 struct cfdriver lpt_cd = { 93 NULL, "lpt", DV_TTY 94 }; 95 96 #define LPTUNIT(s) (minor(s) & 0x1f) 97 #define LPTFLAGS(s) (minor(s) & 0xe0) 98 99 #define LPS_INVERT (LPS_SELECT|LPS_NERR|LPS_NBSY|LPS_NACK) 100 #define LPS_MASK (LPS_SELECT|LPS_NERR|LPS_NBSY|LPS_NACK|LPS_NOPAPER) 101 #define NOT_READY() ((bus_space_read_1(iot, ioh, lpt_status) ^ LPS_INVERT) & LPS_MASK) 102 #define NOT_READY_ERR() not_ready(bus_space_read_1(iot, ioh, lpt_status), sc) 103 static int not_ready __P((u_char, struct lpt_softc *)); 104 105 static void lptwakeup __P((void *arg)); 106 static int pushbytes __P((struct lpt_softc *)); 107 108 void 109 lpt_attach_subr(sc) 110 struct lpt_softc *sc; 111 { 112 bus_space_tag_t iot; 113 bus_space_handle_t ioh; 114 115 sc->sc_state = 0; 116 117 iot = sc->sc_iot; 118 ioh = sc->sc_ioh; 119 120 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 121 } 122 123 /* 124 * Reset the printer, then wait until it's selected and not busy. 125 */ 126 int 127 lptopen(dev, flag, mode, p) 128 dev_t dev; 129 int flag; 130 int mode; 131 struct proc *p; 132 { 133 int unit = LPTUNIT(dev); 134 u_char flags = LPTFLAGS(dev); 135 struct lpt_softc *sc; 136 bus_space_tag_t iot; 137 bus_space_handle_t ioh; 138 u_char control; 139 int error; 140 int spin; 141 142 if (unit >= lpt_cd.cd_ndevs) 143 return ENXIO; 144 sc = lpt_cd.cd_devs[unit]; 145 if (!sc) 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 = geteblk(LPT_BSIZE); 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 not_ready(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 (new & LPS_SELECT) 223 log(LOG_NOTICE, "%s: offline\n", sc->sc_dev.dv_xname); 224 else if (new & LPS_NOPAPER) 225 log(LOG_NOTICE, "%s: out of paper\n", sc->sc_dev.dv_xname); 226 else if (new & LPS_NERR) 227 log(LOG_NOTICE, "%s: output error\n", sc->sc_dev.dv_xname); 228 229 return status; 230 } 231 232 void 233 lptwakeup(arg) 234 void *arg; 235 { 236 struct lpt_softc *sc = arg; 237 int s; 238 239 s = spltty(); 240 lptintr(sc); 241 splx(s); 242 243 timeout(lptwakeup, sc, STEP); 244 } 245 246 /* 247 * Close the device, and free the local line buffer. 248 */ 249 int 250 lptclose(dev, flag, mode, p) 251 dev_t dev; 252 int flag; 253 int mode; 254 struct proc *p; 255 { 256 int unit = LPTUNIT(dev); 257 struct lpt_softc *sc = lpt_cd.cd_devs[unit]; 258 bus_space_tag_t iot = sc->sc_iot; 259 bus_space_handle_t ioh = sc->sc_ioh; 260 261 if (sc->sc_count) 262 (void) pushbytes(sc); 263 264 if ((sc->sc_flags & LPT_NOINTR) == 0) 265 untimeout(lptwakeup, sc); 266 267 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 268 sc->sc_state = 0; 269 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 270 brelse(sc->sc_inbuf); 271 272 LPRINTF(("%s: closed\n", sc->sc_dev.dv_xname)); 273 return 0; 274 } 275 276 int 277 pushbytes(sc) 278 struct lpt_softc *sc; 279 { 280 bus_space_tag_t iot = sc->sc_iot; 281 bus_space_handle_t ioh = sc->sc_ioh; 282 int error; 283 284 if (sc->sc_flags & LPT_NOINTR) { 285 int spin, tic; 286 u_char control = sc->sc_control; 287 288 while (sc->sc_count > 0) { 289 spin = 0; 290 while (NOT_READY()) { 291 if (++spin < sc->sc_spinmax) 292 continue; 293 tic = 0; 294 /* adapt busy-wait algorithm */ 295 sc->sc_spinmax++; 296 while (NOT_READY_ERR()) { 297 /* exponential backoff */ 298 tic = tic + tic + 1; 299 if (tic > TIMEOUT) 300 tic = TIMEOUT; 301 error = tsleep((caddr_t)sc, 302 LPTPRI | PCATCH, "lptpsh", tic); 303 if (error != EWOULDBLOCK) 304 return error; 305 } 306 break; 307 } 308 309 bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++); 310 bus_space_write_1(iot, ioh, lpt_control, 311 control | LPC_STROBE); 312 sc->sc_count--; 313 bus_space_write_1(iot, ioh, lpt_control, control); 314 315 /* adapt busy-wait algorithm */ 316 if (spin*2 + 16 < sc->sc_spinmax) 317 sc->sc_spinmax--; 318 } 319 } else { 320 int s; 321 322 while (sc->sc_count > 0) { 323 /* if the printer is ready for a char, give it one */ 324 if ((sc->sc_state & LPT_OBUSY) == 0) { 325 LPRINTF(("%s: write %u\n", sc->sc_dev.dv_xname, 326 sc->sc_count)); 327 s = spltty(); 328 (void) lptintr(sc); 329 splx(s); 330 } 331 error = tsleep((caddr_t)sc, LPTPRI | PCATCH, 332 "lptwrite2", 0); 333 if (error) 334 return error; 335 } 336 } 337 return 0; 338 } 339 340 /* 341 * Copy a line from user space to a local buffer, then call putc to get the 342 * chars moved to the output queue. 343 */ 344 int 345 lptwrite(dev, uio, flags) 346 dev_t dev; 347 struct uio *uio; 348 int flags; 349 { 350 struct lpt_softc *sc = lpt_cd.cd_devs[LPTUNIT(dev)]; 351 size_t n; 352 int error = 0; 353 354 while ((n = min(LPT_BSIZE, uio->uio_resid)) != 0) { 355 uiomove(sc->sc_cp = sc->sc_inbuf->b_data, n, uio); 356 sc->sc_count = n; 357 error = pushbytes(sc); 358 if (error) { 359 /* 360 * Return accurate residual if interrupted or timed 361 * out. 362 */ 363 uio->uio_resid += sc->sc_count; 364 sc->sc_count = 0; 365 return error; 366 } 367 } 368 return 0; 369 } 370 371 /* 372 * Handle printer interrupts which occur when the printer is ready to accept 373 * another char. 374 */ 375 int 376 lptintr(arg) 377 void *arg; 378 { 379 struct lpt_softc *sc = arg; 380 bus_space_tag_t iot = sc->sc_iot; 381 bus_space_handle_t ioh = sc->sc_ioh; 382 383 #if 0 384 if ((sc->sc_state & LPT_OPEN) == 0) 385 return 0; 386 #endif 387 388 /* is printer online and ready for output */ 389 if (NOT_READY() && NOT_READY_ERR()) 390 return 0; 391 392 if (sc->sc_count) { 393 u_char control = sc->sc_control; 394 /* send char */ 395 bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++); 396 bus_space_write_1(iot, ioh, lpt_control, control | LPC_STROBE); 397 sc->sc_count--; 398 bus_space_write_1(iot, ioh, lpt_control, control); 399 sc->sc_state |= LPT_OBUSY; 400 } else 401 sc->sc_state &= ~LPT_OBUSY; 402 403 if (sc->sc_count == 0) { 404 /* none, wake up the top half to get more */ 405 wakeup((caddr_t)sc); 406 } 407 408 return 1; 409 } 410 411 int 412 lptioctl(dev, cmd, data, flag, p) 413 dev_t dev; 414 u_long cmd; 415 caddr_t data; 416 int flag; 417 struct proc *p; 418 { 419 int error = 0; 420 421 switch (cmd) { 422 default: 423 error = ENODEV; 424 } 425 426 return error; 427 } 428
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