lpt.c revision 1.18.16.1
1 /* $NetBSD: lpt.c,v 1.18.16.1 2002/05/17 15:41:01 gehenna Exp $ */ 2 3 /* 4 * Copyright (c) 1996 Leo Weppelman 5 * Copyright (c) 1993, 1994 Charles M. Hannum. 6 * Copyright (c) 1990 William F. Jolitz, TeleMuse 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This software is a component of "386BSD" developed by 20 * William F. Jolitz, TeleMuse. 21 * 4. Neither the name of the developer nor the name "386BSD" 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE DEVELOPER BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 */ 37 38 /* 39 * Device Driver originally written for AT parallel printer port. Now 40 * drives the printer port on the YM2149. 41 * 42 * THIS SOFTWARE IS A COMPONENT OF 386BSD DEVELOPED BY WILLIAM F. JOLITZ 43 * AND IS INTENDED FOR RESEARCH AND EDUCATIONAL PURPOSES ONLY. THIS 44 * SOFTWARE SHOULD NOT BE CONSIDERED TO BE A COMMERCIAL PRODUCT. 45 * THE DEVELOPER URGES THAT USERS WHO REQUIRE A COMMERCIAL PRODUCT 46 * NOT MAKE USE OF THIS WORK. 47 * 48 * FOR USERS WHO WISH TO UNDERSTAND THE 386BSD SYSTEM DEVELOPED 49 * BY WILLIAM F. JOLITZ, WE RECOMMEND THE USER STUDY WRITTEN 50 * REFERENCES SUCH AS THE "PORTING UNIX TO THE 386" SERIES 51 * (BEGINNING JANUARY 1991 "DR. DOBBS JOURNAL", USA AND BEGINNING 52 * JUNE 1991 "UNIX MAGAZIN", GERMANY) BY WILLIAM F. JOLITZ AND 53 * LYNNE GREER JOLITZ, AS WELL AS OTHER BOOKS ON UNIX AND THE 54 * ON-LINE 386BSD USER MANUAL BEFORE USE. A BOOK DISCUSSING THE INTERNALS 55 * OF 386BSD ENTITLED "386BSD FROM THE INSIDE OUT" WILL BE AVAILABLE LATE 1992. 56 */ 57 58 #include <sys/param.h> 59 #include <sys/systm.h> 60 #include <sys/callout.h> 61 #include <sys/proc.h> 62 #include <sys/user.h> 63 #include <sys/buf.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/cpu.h> 72 #include <machine/iomap.h> 73 #include <machine/mfp.h> 74 75 #include <atari/dev/ym2149reg.h> 76 #include <atari/atari/intr.h> 77 78 #define TIMEOUT hz*16 /* wait up to 16 seconds for a ready */ 79 #define STEP hz/4 80 81 #define LPTPRI (PZERO+8) 82 #define LPT_BSIZE 1024 83 84 #if !defined(DEBUG) || !defined(notdef) 85 #define lprintf if (0) printf 86 #else 87 #define lprintf if (lptdebug) printf 88 int lptdebug = 1; 89 #endif 90 91 struct lpt_softc { 92 struct device sc_dev; 93 struct callout sc_wakeup_ch; 94 size_t sc_count; 95 struct buf *sc_inbuf; 96 u_char *sc_cp; 97 int sc_spinmax; 98 u_char sc_state; 99 #define LPT_OPEN 0x01 /* device is open */ 100 #define LPT_OBUSY 0x02 /* printer is busy doing output */ 101 #define LPT_INIT 0x04 /* waiting to initialize for open */ 102 u_char sc_flags; 103 #define LPT_AUTOLF 0x20 /* automatic LF on CR XXX: LWP - not yet... */ 104 #define LPT_NOINTR 0x40 /* do not use interrupt */ 105 }; 106 107 #define LPTUNIT(s) (minor(s) & 0x1f) 108 #define LPTFLAGS(s) (minor(s) & 0xe0) 109 #define NOT_READY() (MFP->mf_gpip & IO_PBSY) 110 111 /* {b,c}devsw[] function prototypes */ 112 dev_type_open(lpopen); 113 dev_type_close(lpclose); 114 dev_type_write(lpwrite); 115 dev_type_ioctl(lpioctl); 116 117 static void lptwakeup __P((void *arg)); 118 static int pushbytes __P((struct lpt_softc *)); 119 static void lptpseudointr __P((struct lpt_softc *)); 120 int lptintr __P((struct lpt_softc *)); 121 int lpthwintr __P((struct lpt_softc *, int)); 122 123 124 /* 125 * Autoconfig stuff 126 */ 127 static void lpattach __P((struct device *, struct device *, void *)); 128 static int lpmatch __P((struct device *, struct cfdata *, void *)); 129 130 struct cfattach lp_ca = { 131 sizeof(struct lpt_softc), lpmatch, lpattach 132 }; 133 134 extern struct cfdriver lp_cd; 135 136 const struct cdevsw lp_cdevsw = { 137 lpopen, lpclose, noread, lpwrite, lpioctl, 138 nostop, notty, nopoll, nommap, 139 }; 140 141 /*ARGSUSED*/ 142 static int 143 lpmatch(pdp, cfp, auxp) 144 struct device *pdp; 145 struct cfdata *cfp; 146 void *auxp; 147 { 148 static int lpt_matched = 0; 149 150 /* Match at most 1 lpt unit */ 151 if (strcmp((char *)auxp, "lpt") || lpt_matched) 152 return 0; 153 lpt_matched = 1; 154 return (1); 155 } 156 157 /*ARGSUSED*/ 158 static void 159 lpattach(pdp, dp, auxp) 160 struct device *pdp, *dp; 161 void *auxp; 162 { 163 struct lpt_softc *sc = (void *)dp; 164 165 sc->sc_state = 0; 166 167 if (intr_establish(0, USER_VEC, 0, (hw_ifun_t)lpthwintr, sc) == NULL) 168 printf("lptattach: Can't establish interrupt\n"); 169 ym2149_strobe(1); 170 171 printf("\n"); 172 173 callout_init(&sc->sc_wakeup_ch); 174 } 175 176 /* 177 * Reset the printer, then wait until it's selected and not busy. 178 */ 179 int 180 lpopen(dev, flag, mode, p) 181 dev_t dev; 182 int flag, mode; 183 struct proc *p; 184 { 185 int unit = LPTUNIT(dev); 186 u_char flags = LPTFLAGS(dev); 187 struct lpt_softc *sc; 188 int error; 189 int spin; 190 int sps; 191 192 if (unit >= lp_cd.cd_ndevs) 193 return ENXIO; 194 sc = lp_cd.cd_devs[unit]; 195 if (!sc) 196 return ENXIO; 197 198 #ifdef DIAGNOSTIC 199 if (sc->sc_state) 200 printf("%s: stat=0x%x not zero\n", sc->sc_dev.dv_xname, 201 sc->sc_state); 202 #endif 203 204 if (sc->sc_state) 205 return EBUSY; 206 207 sc->sc_state = LPT_INIT; 208 sc->sc_flags = flags; 209 lprintf("%s: open: flags=0x%x\n", sc->sc_dev.dv_xname, flags); 210 211 /* wait till ready (printer running diagnostics) */ 212 for (spin = 0; NOT_READY(); spin += STEP) { 213 if (spin >= TIMEOUT) { 214 sc->sc_state = 0; 215 return EBUSY; 216 } 217 218 /* wait 1/4 second, give up if we get a signal */ 219 if ((error = tsleep((caddr_t)sc, LPTPRI | PCATCH, "lptopen", 220 STEP)) != EWOULDBLOCK) { 221 sc->sc_state = 0; 222 return error; 223 } 224 } 225 226 sc->sc_inbuf = geteblk(LPT_BSIZE); 227 sc->sc_count = 0; 228 sc->sc_state = LPT_OPEN; 229 230 if ((sc->sc_flags & LPT_NOINTR) == 0) { 231 lptwakeup(sc); 232 233 sps = splhigh(); 234 MFP->mf_imrb |= IB_PBSY; 235 MFP->mf_ierb |= IB_PBSY; 236 splx(sps); 237 } 238 239 lprintf("%s: opened\n", sc->sc_dev.dv_xname); 240 return 0; 241 } 242 243 void 244 lptwakeup(arg) 245 void *arg; 246 { 247 struct lpt_softc *sc = arg; 248 249 lptpseudointr(sc); 250 251 callout_reset(&sc->sc_wakeup_ch, STEP, lptwakeup, sc); 252 } 253 254 /* 255 * Close the device, and free the local line buffer. 256 */ 257 int 258 lpclose(dev, flag, mode, p) 259 dev_t dev; 260 int flag; 261 int mode; 262 struct proc *p; 263 { 264 int unit = LPTUNIT(dev); 265 struct lpt_softc *sc = lp_cd.cd_devs[unit]; 266 int sps; 267 268 if (sc->sc_count) 269 (void) pushbytes(sc); 270 271 if ((sc->sc_flags & LPT_NOINTR) == 0) { 272 callout_stop(&sc->sc_wakeup_ch); 273 274 sps = splhigh(); 275 MFP->mf_ierb &= ~IB_PBSY; 276 MFP->mf_imrb &= ~IB_PBSY; 277 splx(sps); 278 } 279 280 sc->sc_state = 0; 281 brelse(sc->sc_inbuf); 282 283 lprintf("%s: closed\n", sc->sc_dev.dv_xname); 284 return 0; 285 } 286 287 int 288 pushbytes(sc) 289 struct lpt_softc *sc; 290 { 291 int error; 292 293 if (sc->sc_flags & LPT_NOINTR) { 294 int spin, tic; 295 296 while (sc->sc_count > 0) { 297 spin = 0; 298 while (NOT_READY()) { 299 if (++spin < sc->sc_spinmax) 300 continue; 301 tic = 0; 302 /* adapt busy-wait algorithm */ 303 sc->sc_spinmax++; 304 while (NOT_READY()) { 305 /* exponential backoff */ 306 tic = tic + tic + 1; 307 if (tic > TIMEOUT) 308 tic = TIMEOUT; 309 error = tsleep((caddr_t)sc, 310 LPTPRI | PCATCH, "lptpsh", tic); 311 if (error != EWOULDBLOCK) 312 return error; 313 } 314 break; 315 } 316 317 ym2149_write_ioport(YM_IOB, *sc->sc_cp++); 318 ym2149_strobe(0); 319 sc->sc_count--; 320 ym2149_strobe(1); 321 322 /* adapt busy-wait algorithm */ 323 if (spin*2 + 16 < sc->sc_spinmax) 324 sc->sc_spinmax--; 325 } 326 } else { 327 while (sc->sc_count > 0) { 328 /* if the printer is ready for a char, give it one */ 329 if ((sc->sc_state & LPT_OBUSY) == 0) { 330 lprintf("%s: write %d\n", sc->sc_dev.dv_xname, 331 sc->sc_count); 332 (void) lptpseudointr(sc); 333 } 334 if ((error = tsleep((caddr_t)sc, LPTPRI | PCATCH, 335 "lptwrite2", 0)) != 0) 336 return error; 337 } 338 } 339 return 0; 340 } 341 342 /* 343 * Copy a line from user space to a local buffer, then call putc to get the 344 * chars moved to the output queue. 345 */ 346 int 347 lpwrite(dev, uio, flags) 348 dev_t dev; 349 struct uio *uio; 350 int flags; 351 { 352 struct lpt_softc *sc = lp_cd.cd_devs[LPTUNIT(dev)]; 353 size_t n; 354 int error = 0; 355 356 while ((n = min(LPT_BSIZE, uio->uio_resid)) > 0) { 357 uiomove(sc->sc_cp = sc->sc_inbuf->b_data, n, uio); 358 sc->sc_count = n; 359 error = pushbytes(sc); 360 if (error) { 361 /* 362 * Return accurate residual if interrupted or timed 363 * out. 364 */ 365 uio->uio_resid += sc->sc_count; 366 sc->sc_count = 0; 367 return error; 368 } 369 } 370 return 0; 371 } 372 373 /* 374 * Handle printer interrupts which occur when the printer is ready to accept 375 * another char. 376 */ 377 int 378 lptintr(sc) 379 struct lpt_softc *sc; 380 { 381 /* is printer online and ready for output */ 382 if (NOT_READY()) 383 return 0; 384 385 if (sc->sc_count) { 386 387 /* send char */ 388 ym2149_write_ioport(YM_IOB, *sc->sc_cp++); 389 ym2149_strobe(0); 390 sc->sc_count--; 391 ym2149_strobe(1); 392 sc->sc_state |= LPT_OBUSY; 393 } else 394 sc->sc_state &= ~LPT_OBUSY; 395 396 if (sc->sc_count == 0) { 397 /* none, wake up the top half to get more */ 398 wakeup((caddr_t)sc); 399 } 400 401 return 1; 402 } 403 404 static void 405 lptpseudointr(sc) 406 struct lpt_softc *sc; 407 { 408 int s; 409 410 s = spltty(); 411 lptintr(sc); 412 splx(s); 413 } 414 415 int 416 lpthwintr(sc, sr) 417 struct lpt_softc *sc; 418 int sr; 419 { 420 if (!BASEPRI(sr)) 421 add_sicallback((si_farg)lptpseudointr, sc, 0); 422 else lptpseudointr(sc); 423 return 1; 424 } 425 426 int 427 lpioctl(dev, cmd, data, flag, p) 428 dev_t dev; 429 u_long cmd; 430 caddr_t data; 431 int flag; 432 struct proc *p; 433 { 434 int error = 0; 435 436 switch (cmd) { 437 default: 438 error = ENODEV; 439 } 440 441 return error; 442 } 443
Indexes created Tue Sep 30 11:09:46 GMT 2025