lpt.c revision 1.16
1 /* $NetBSD: lpt.c,v 1.16 2000/03/23 06:36:04 thorpej 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 /*ARGSUSED*/ 137 static int 138 lpmatch(pdp, cfp, auxp) 139 struct device *pdp; 140 struct cfdata *cfp; 141 void *auxp; 142 { 143 if (!strcmp((char *)auxp, "lpt") && cfp->cf_unit == 0) 144 return (1); 145 return (0); 146 } 147 148 /*ARGSUSED*/ 149 static void 150 lpattach(pdp, dp, auxp) 151 struct device *pdp, *dp; 152 void *auxp; 153 { 154 struct lpt_softc *sc = (void *)dp; 155 156 sc->sc_state = 0; 157 158 if (intr_establish(0, USER_VEC, 0, (hw_ifun_t)lpthwintr, sc) == NULL) 159 printf("lptattach: Can't establish interrupt\n"); 160 ym2149_strobe(1); 161 162 printf("\n"); 163 164 callout_init(&sc->sc_wakeup_ch); 165 } 166 167 /* 168 * Reset the printer, then wait until it's selected and not busy. 169 */ 170 int 171 lpopen(dev, flag, mode, p) 172 dev_t dev; 173 int flag, mode; 174 struct proc *p; 175 { 176 int unit = LPTUNIT(dev); 177 u_char flags = LPTFLAGS(dev); 178 struct lpt_softc *sc; 179 int error; 180 int spin; 181 int sps; 182 183 if (unit >= lp_cd.cd_ndevs) 184 return ENXIO; 185 sc = lp_cd.cd_devs[unit]; 186 if (!sc) 187 return ENXIO; 188 189 #ifdef DIAGNOSTIC 190 if (sc->sc_state) 191 printf("%s: stat=0x%x not zero\n", sc->sc_dev.dv_xname, 192 sc->sc_state); 193 #endif 194 195 if (sc->sc_state) 196 return EBUSY; 197 198 sc->sc_state = LPT_INIT; 199 sc->sc_flags = flags; 200 lprintf("%s: open: flags=0x%x\n", sc->sc_dev.dv_xname, flags); 201 202 /* wait till ready (printer running diagnostics) */ 203 for (spin = 0; NOT_READY(); spin += STEP) { 204 if (spin >= TIMEOUT) { 205 sc->sc_state = 0; 206 return EBUSY; 207 } 208 209 /* wait 1/4 second, give up if we get a signal */ 210 if ((error = tsleep((caddr_t)sc, LPTPRI | PCATCH, "lptopen", 211 STEP)) != EWOULDBLOCK) { 212 sc->sc_state = 0; 213 return error; 214 } 215 } 216 217 sc->sc_inbuf = geteblk(LPT_BSIZE); 218 sc->sc_count = 0; 219 sc->sc_state = LPT_OPEN; 220 221 if ((sc->sc_flags & LPT_NOINTR) == 0) { 222 lptwakeup(sc); 223 224 sps = splhigh(); 225 MFP->mf_imrb |= IB_PBSY; 226 MFP->mf_ierb |= IB_PBSY; 227 splx(sps); 228 } 229 230 lprintf("%s: opened\n", sc->sc_dev.dv_xname); 231 return 0; 232 } 233 234 void 235 lptwakeup(arg) 236 void *arg; 237 { 238 struct lpt_softc *sc = arg; 239 240 lptpseudointr(sc); 241 242 callout_reset(&sc->sc_wakeup_ch, STEP, lptwakeup, sc); 243 } 244 245 /* 246 * Close the device, and free the local line buffer. 247 */ 248 int 249 lpclose(dev, flag, mode, p) 250 dev_t dev; 251 int flag; 252 int mode; 253 struct proc *p; 254 { 255 int unit = LPTUNIT(dev); 256 struct lpt_softc *sc = lp_cd.cd_devs[unit]; 257 int sps; 258 259 if (sc->sc_count) 260 (void) pushbytes(sc); 261 262 if ((sc->sc_flags & LPT_NOINTR) == 0) { 263 callout_stop(&sc->sc_wakeup_ch); 264 265 sps = splhigh(); 266 MFP->mf_ierb &= ~IB_PBSY; 267 MFP->mf_imrb &= ~IB_PBSY; 268 splx(sps); 269 } 270 271 sc->sc_state = 0; 272 brelse(sc->sc_inbuf); 273 274 lprintf("%s: closed\n", sc->sc_dev.dv_xname); 275 return 0; 276 } 277 278 int 279 pushbytes(sc) 280 struct lpt_softc *sc; 281 { 282 int error; 283 284 if (sc->sc_flags & LPT_NOINTR) { 285 int spin, tic; 286 287 while (sc->sc_count > 0) { 288 spin = 0; 289 while (NOT_READY()) { 290 if (++spin < sc->sc_spinmax) 291 continue; 292 tic = 0; 293 /* adapt busy-wait algorithm */ 294 sc->sc_spinmax++; 295 while (NOT_READY()) { 296 /* exponential backoff */ 297 tic = tic + tic + 1; 298 if (tic > TIMEOUT) 299 tic = TIMEOUT; 300 error = tsleep((caddr_t)sc, 301 LPTPRI | PCATCH, "lptpsh", tic); 302 if (error != EWOULDBLOCK) 303 return error; 304 } 305 break; 306 } 307 308 ym2149_write_ioport(YM_IOB, *sc->sc_cp++); 309 ym2149_strobe(0); 310 sc->sc_count--; 311 ym2149_strobe(1); 312 313 /* adapt busy-wait algorithm */ 314 if (spin*2 + 16 < sc->sc_spinmax) 315 sc->sc_spinmax--; 316 } 317 } else { 318 while (sc->sc_count > 0) { 319 /* if the printer is ready for a char, give it one */ 320 if ((sc->sc_state & LPT_OBUSY) == 0) { 321 lprintf("%s: write %d\n", sc->sc_dev.dv_xname, 322 sc->sc_count); 323 (void) lptpseudointr(sc); 324 } 325 if ((error = tsleep((caddr_t)sc, LPTPRI | PCATCH, 326 "lptwrite2", 0)) != 0) 327 return error; 328 } 329 } 330 return 0; 331 } 332 333 /* 334 * Copy a line from user space to a local buffer, then call putc to get the 335 * chars moved to the output queue. 336 */ 337 int 338 lpwrite(dev, uio, flags) 339 dev_t dev; 340 struct uio *uio; 341 int flags; 342 { 343 struct lpt_softc *sc = lp_cd.cd_devs[LPTUNIT(dev)]; 344 size_t n; 345 int error = 0; 346 347 while ((n = min(LPT_BSIZE, uio->uio_resid)) > 0) { 348 uiomove(sc->sc_cp = sc->sc_inbuf->b_data, n, uio); 349 sc->sc_count = n; 350 error = pushbytes(sc); 351 if (error) { 352 /* 353 * Return accurate residual if interrupted or timed 354 * out. 355 */ 356 uio->uio_resid += sc->sc_count; 357 sc->sc_count = 0; 358 return error; 359 } 360 } 361 return 0; 362 } 363 364 /* 365 * Handle printer interrupts which occur when the printer is ready to accept 366 * another char. 367 */ 368 int 369 lptintr(sc) 370 struct lpt_softc *sc; 371 { 372 /* is printer online and ready for output */ 373 if (NOT_READY()) 374 return 0; 375 376 if (sc->sc_count) { 377 378 /* send char */ 379 ym2149_write_ioport(YM_IOB, *sc->sc_cp++); 380 ym2149_strobe(0); 381 sc->sc_count--; 382 ym2149_strobe(1); 383 sc->sc_state |= LPT_OBUSY; 384 } else 385 sc->sc_state &= ~LPT_OBUSY; 386 387 if (sc->sc_count == 0) { 388 /* none, wake up the top half to get more */ 389 wakeup((caddr_t)sc); 390 } 391 392 return 1; 393 } 394 395 static void 396 lptpseudointr(sc) 397 struct lpt_softc *sc; 398 { 399 int s; 400 401 s = spltty(); 402 lptintr(sc); 403 splx(s); 404 } 405 406 int 407 lpthwintr(sc, sr) 408 struct lpt_softc *sc; 409 int sr; 410 { 411 if (!BASEPRI(sr)) 412 add_sicallback((si_farg)lptpseudointr, sc, 0); 413 else lptpseudointr(sc); 414 return 1; 415 } 416 417 int 418 lpioctl(dev, cmd, data, flag, p) 419 dev_t dev; 420 u_long cmd; 421 caddr_t data; 422 int flag; 423 struct proc *p; 424 { 425 int error = 0; 426 427 switch (cmd) { 428 default: 429 error = ENODEV; 430 } 431 432 return error; 433 } 434
Indexes created Tue Sep 30 11:09:46 GMT 2025