lpt.c revision 1.24.26.1
1 /* $NetBSD: lpt.c,v 1.24.26.1 2007/03/12 05:47:21 rmind 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/cdefs.h> 59 __KERNEL_RCSID(0, "$NetBSD: lpt.c,v 1.24.26.1 2007/03/12 05:47:21 rmind Exp $"); 60 61 #include <sys/param.h> 62 #include <sys/systm.h> 63 #include <sys/callout.h> 64 #include <sys/proc.h> 65 #include <sys/user.h> 66 #include <sys/buf.h> 67 #include <sys/kernel.h> 68 #include <sys/ioctl.h> 69 #include <sys/uio.h> 70 #include <sys/device.h> 71 #include <sys/conf.h> 72 #include <sys/syslog.h> 73 74 #include <machine/cpu.h> 75 #include <machine/iomap.h> 76 #include <machine/mfp.h> 77 78 #include <atari/dev/ym2149reg.h> 79 #include <atari/atari/intr.h> 80 81 #define TIMEOUT hz*16 /* wait up to 16 seconds for a ready */ 82 #define STEP hz/4 83 84 #define LPTPRI (PZERO+8) 85 #define LPT_BSIZE 1024 86 87 #if !defined(DEBUG) || !defined(notdef) 88 #define lprintf if (0) printf 89 #else 90 #define lprintf if (lptdebug) printf 91 int lptdebug = 1; 92 #endif 93 94 struct lpt_softc { 95 struct device sc_dev; 96 struct callout sc_wakeup_ch; 97 size_t sc_count; 98 struct buf *sc_inbuf; 99 u_char *sc_cp; 100 int sc_spinmax; 101 u_char sc_state; 102 #define LPT_OPEN 0x01 /* device is open */ 103 #define LPT_OBUSY 0x02 /* printer is busy doing output */ 104 #define LPT_INIT 0x04 /* waiting to initialize for open */ 105 u_char sc_flags; 106 #define LPT_AUTOLF 0x20 /* automatic LF on CR XXX: LWP - not yet... */ 107 #define LPT_NOINTR 0x40 /* do not use interrupt */ 108 }; 109 110 #define LPTUNIT(s) (minor(s) & 0x1f) 111 #define LPTFLAGS(s) (minor(s) & 0xe0) 112 #define NOT_READY() (MFP->mf_gpip & IO_PBSY) 113 114 /* {b,c}devsw[] function prototypes */ 115 dev_type_open(lpopen); 116 dev_type_close(lpclose); 117 dev_type_write(lpwrite); 118 dev_type_ioctl(lpioctl); 119 120 static void lptwakeup __P((void *arg)); 121 static int pushbytes __P((struct lpt_softc *)); 122 static void lptpseudointr __P((struct lpt_softc *)); 123 int lptintr __P((struct lpt_softc *)); 124 int lpthwintr __P((struct lpt_softc *, int)); 125 126 127 /* 128 * Autoconfig stuff 129 */ 130 static void lpattach __P((struct device *, struct device *, void *)); 131 static int lpmatch __P((struct device *, struct cfdata *, void *)); 132 133 CFATTACH_DECL(lp, sizeof(struct lpt_softc), 134 lpmatch, lpattach, NULL, NULL); 135 136 extern struct cfdriver lp_cd; 137 138 const struct cdevsw lp_cdevsw = { 139 lpopen, lpclose, noread, lpwrite, lpioctl, 140 nostop, notty, nopoll, nommap, nokqfilter, 141 }; 142 143 /*ARGSUSED*/ 144 static int 145 lpmatch(pdp, cfp, auxp) 146 struct device *pdp; 147 struct cfdata *cfp; 148 void *auxp; 149 { 150 static int lpt_matched = 0; 151 152 /* Match at most 1 lpt unit */ 153 if (strcmp((char *)auxp, "lpt") || lpt_matched) 154 return 0; 155 lpt_matched = 1; 156 return (1); 157 } 158 159 /*ARGSUSED*/ 160 static void 161 lpattach(pdp, dp, auxp) 162 struct device *pdp, *dp; 163 void *auxp; 164 { 165 struct lpt_softc *sc = (void *)dp; 166 167 sc->sc_state = 0; 168 169 if (intr_establish(0, USER_VEC, 0, (hw_ifun_t)lpthwintr, sc) == NULL) 170 printf("lptattach: Can't establish interrupt\n"); 171 ym2149_strobe(1); 172 173 printf("\n"); 174 175 callout_init(&sc->sc_wakeup_ch); 176 } 177 178 /* 179 * Reset the printer, then wait until it's selected and not busy. 180 */ 181 int 182 lpopen(dev, flag, mode, l) 183 dev_t dev; 184 int flag, mode; 185 struct lwp *l; 186 { 187 int unit = LPTUNIT(dev); 188 u_char flags = LPTFLAGS(dev); 189 struct lpt_softc *sc; 190 int error; 191 int spin; 192 int sps; 193 194 if (unit >= lp_cd.cd_ndevs) 195 return ENXIO; 196 sc = lp_cd.cd_devs[unit]; 197 if (!sc) 198 return ENXIO; 199 200 #ifdef DIAGNOSTIC 201 if (sc->sc_state) 202 printf("%s: stat=0x%x not zero\n", sc->sc_dev.dv_xname, 203 sc->sc_state); 204 #endif 205 206 if (sc->sc_state) 207 return EBUSY; 208 209 sc->sc_state = LPT_INIT; 210 sc->sc_flags = flags; 211 lprintf("%s: open: flags=0x%x\n", sc->sc_dev.dv_xname, flags); 212 213 /* wait till ready (printer running diagnostics) */ 214 for (spin = 0; NOT_READY(); spin += STEP) { 215 if (spin >= TIMEOUT) { 216 sc->sc_state = 0; 217 return EBUSY; 218 } 219 220 /* wait 1/4 second, give up if we get a signal */ 221 if ((error = tsleep((void *)sc, LPTPRI | PCATCH, "lptopen", 222 STEP)) != EWOULDBLOCK) { 223 sc->sc_state = 0; 224 return error; 225 } 226 } 227 228 sc->sc_inbuf = geteblk(LPT_BSIZE); 229 sc->sc_count = 0; 230 sc->sc_state = LPT_OPEN; 231 232 if ((sc->sc_flags & LPT_NOINTR) == 0) { 233 lptwakeup(sc); 234 235 sps = splhigh(); 236 MFP->mf_imrb |= IB_PBSY; 237 MFP->mf_ierb |= IB_PBSY; 238 splx(sps); 239 } 240 241 lprintf("%s: opened\n", sc->sc_dev.dv_xname); 242 return 0; 243 } 244 245 void 246 lptwakeup(arg) 247 void *arg; 248 { 249 struct lpt_softc *sc = arg; 250 251 lptpseudointr(sc); 252 253 callout_reset(&sc->sc_wakeup_ch, STEP, lptwakeup, sc); 254 } 255 256 /* 257 * Close the device, and free the local line buffer. 258 */ 259 int 260 lpclose(dev, flag, mode, l) 261 dev_t dev; 262 int flag; 263 int mode; 264 struct lwp *l; 265 { 266 int unit = LPTUNIT(dev); 267 struct lpt_softc *sc = lp_cd.cd_devs[unit]; 268 int sps; 269 270 if (sc->sc_count) 271 (void) pushbytes(sc); 272 273 if ((sc->sc_flags & LPT_NOINTR) == 0) { 274 callout_stop(&sc->sc_wakeup_ch); 275 276 sps = splhigh(); 277 MFP->mf_ierb &= ~IB_PBSY; 278 MFP->mf_imrb &= ~IB_PBSY; 279 splx(sps); 280 } 281 282 sc->sc_state = 0; 283 brelse(sc->sc_inbuf); 284 285 lprintf("%s: closed\n", sc->sc_dev.dv_xname); 286 return 0; 287 } 288 289 int 290 pushbytes(sc) 291 struct lpt_softc *sc; 292 { 293 int error; 294 295 if (sc->sc_flags & LPT_NOINTR) { 296 int spin, tic; 297 298 while (sc->sc_count > 0) { 299 spin = 0; 300 while (NOT_READY()) { 301 if (++spin < sc->sc_spinmax) 302 continue; 303 tic = 0; 304 /* adapt busy-wait algorithm */ 305 sc->sc_spinmax++; 306 while (NOT_READY()) { 307 /* exponential backoff */ 308 tic = tic + tic + 1; 309 if (tic > TIMEOUT) 310 tic = TIMEOUT; 311 error = tsleep((void *)sc, 312 LPTPRI | PCATCH, "lptpsh", tic); 313 if (error != EWOULDBLOCK) 314 return error; 315 } 316 break; 317 } 318 319 ym2149_write_ioport(YM_IOB, *sc->sc_cp++); 320 ym2149_strobe(0); 321 sc->sc_count--; 322 ym2149_strobe(1); 323 324 /* adapt busy-wait algorithm */ 325 if (spin*2 + 16 < sc->sc_spinmax) 326 sc->sc_spinmax--; 327 } 328 } else { 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 %d\n", sc->sc_dev.dv_xname, 333 sc->sc_count); 334 (void) lptpseudointr(sc); 335 } 336 if ((error = tsleep((void *)sc, LPTPRI | PCATCH, 337 "lptwrite2", 0)) != 0) 338 return error; 339 } 340 } 341 return 0; 342 } 343 344 /* 345 * Copy a line from user space to a local buffer, then call putc to get the 346 * chars moved to the output queue. 347 */ 348 int 349 lpwrite(dev, uio, flags) 350 dev_t dev; 351 struct uio *uio; 352 int flags; 353 { 354 struct lpt_softc *sc = lp_cd.cd_devs[LPTUNIT(dev)]; 355 size_t n; 356 int error = 0; 357 358 while ((n = min(LPT_BSIZE, uio->uio_resid)) > 0) { 359 uiomove(sc->sc_cp = sc->sc_inbuf->b_data, n, uio); 360 sc->sc_count = n; 361 error = pushbytes(sc); 362 if (error) { 363 /* 364 * Return accurate residual if interrupted or timed 365 * out. 366 */ 367 uio->uio_resid += sc->sc_count; 368 sc->sc_count = 0; 369 return error; 370 } 371 } 372 return 0; 373 } 374 375 /* 376 * Handle printer interrupts which occur when the printer is ready to accept 377 * another char. 378 */ 379 int 380 lptintr(sc) 381 struct lpt_softc *sc; 382 { 383 /* is printer online and ready for output */ 384 if (NOT_READY()) 385 return 0; 386 387 if (sc->sc_count) { 388 389 /* send char */ 390 ym2149_write_ioport(YM_IOB, *sc->sc_cp++); 391 ym2149_strobe(0); 392 sc->sc_count--; 393 ym2149_strobe(1); 394 sc->sc_state |= LPT_OBUSY; 395 } else 396 sc->sc_state &= ~LPT_OBUSY; 397 398 if (sc->sc_count == 0) { 399 /* none, wake up the top half to get more */ 400 wakeup((void *)sc); 401 } 402 403 return 1; 404 } 405 406 static void 407 lptpseudointr(sc) 408 struct lpt_softc *sc; 409 { 410 int s; 411 412 s = spltty(); 413 lptintr(sc); 414 splx(s); 415 } 416 417 int 418 lpthwintr(sc, sr) 419 struct lpt_softc *sc; 420 int sr; 421 { 422 if (!BASEPRI(sr)) 423 add_sicallback((si_farg)lptpseudointr, sc, 0); 424 else lptpseudointr(sc); 425 return 1; 426 } 427 428 int 429 lpioctl(dev, cmd, data, flag, l) 430 dev_t dev; 431 u_long cmd; 432 void * data; 433 int flag; 434 struct lwp *l; 435 { 436 int error = 0; 437 438 switch (cmd) { 439 default: 440 error = ENODEV; 441 } 442 443 return error; 444 } 445
Indexes created Tue Sep 30 11:09:46 GMT 2025