lpt.c revision 1.13
1 /* $NetBSD: lpt.c,v 1.13 1998/01/15 13:06:27 leo Exp $ */ 2 3 /* 4 * Copyright (c) 1996 Leo Weppelman 5 * Copyright (c) 1993, 1994 Charles 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 A COMPONENT OF 386BSD DEVELOPED BY WILLIAM F. JOLITZ 26 * AND IS INTENDED FOR RESEARCH AND EDUCATIONAL PURPOSES ONLY. THIS 27 * SOFTWARE SHOULD NOT BE CONSIDERED TO BE A COMMERCIAL PRODUCT. 28 * THE DEVELOPER URGES THAT USERS WHO REQUIRE A COMMERCIAL PRODUCT 29 * NOT MAKE USE OF THIS WORK. 30 * 31 * FOR USERS WHO WISH TO UNDERSTAND THE 386BSD SYSTEM DEVELOPED 32 * BY WILLIAM F. JOLITZ, WE RECOMMEND THE USER STUDY WRITTEN 33 * REFERENCES SUCH AS THE "PORTING UNIX TO THE 386" SERIES 34 * (BEGINNING JANUARY 1991 "DR. DOBBS JOURNAL", USA AND BEGINNING 35 * JUNE 1991 "UNIX MAGAZIN", GERMANY) BY WILLIAM F. JOLITZ AND 36 * LYNNE GREER JOLITZ, AS WELL AS OTHER BOOKS ON UNIX AND THE 37 * ON-LINE 386BSD USER MANUAL BEFORE USE. A BOOK DISCUSSING THE INTERNALS 38 * OF 386BSD ENTITLED "386BSD FROM THE INSIDE OUT" WILL BE AVAILABLE LATE 1992. 39 * 40 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``AS IS'' AND 41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 43 * ARE DISCLAIMED. IN NO EVENT SHALL THE DEVELOPER BE LIABLE 44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 50 * SUCH DAMAGE. 51 */ 52 53 /* 54 * Device Driver originally written for AT parallel printer port. Now 55 * drives the printer port on the YM2149. 56 */ 57 58 #include <sys/param.h> 59 #include <sys/systm.h> 60 #include <sys/proc.h> 61 #include <sys/user.h> 62 #include <sys/buf.h> 63 #include <sys/kernel.h> 64 #include <sys/ioctl.h> 65 #include <sys/uio.h> 66 #include <sys/device.h> 67 #include <sys/conf.h> 68 #include <sys/syslog.h> 69 70 #include <machine/cpu.h> 71 #include <machine/iomap.h> 72 #include <machine/mfp.h> 73 74 #include <atari/dev/ym2149reg.h> 75 #include <atari/atari/intr.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 #if !defined(DEBUG) || !defined(notdef) 84 #define lprintf if (0) printf 85 #else 86 #define lprintf if (lptdebug) printf 87 int lptdebug = 1; 88 #endif 89 90 struct lpt_softc { 91 struct device sc_dev; 92 size_t sc_count; 93 struct buf *sc_inbuf; 94 u_char *sc_cp; 95 int sc_spinmax; 96 u_char sc_state; 97 #define LPT_OPEN 0x01 /* device is open */ 98 #define LPT_OBUSY 0x02 /* printer is busy doing output */ 99 #define LPT_INIT 0x04 /* waiting to initialize for open */ 100 u_char sc_flags; 101 #define LPT_AUTOLF 0x20 /* automatic LF on CR XXX: LWP - not yet... */ 102 #define LPT_NOINTR 0x40 /* do not use interrupt */ 103 }; 104 105 #define LPTUNIT(s) (minor(s) & 0x1f) 106 #define LPTFLAGS(s) (minor(s) & 0xe0) 107 #define NOT_READY() (MFP->mf_gpip & IO_PBSY) 108 109 /* {b,c}devsw[] function prototypes */ 110 dev_type_open(lpopen); 111 dev_type_close(lpclose); 112 dev_type_write(lpwrite); 113 dev_type_ioctl(lpioctl); 114 115 static void lptwakeup __P((void *arg)); 116 static int pushbytes __P((struct lpt_softc *)); 117 static void lptpseudointr __P((struct lpt_softc *)); 118 int lptintr __P((struct lpt_softc *)); 119 int lpthwintr __P((struct lpt_softc *, int)); 120 121 122 /* 123 * Autoconfig stuff 124 */ 125 static void lpattach __P((struct device *, struct device *, void *)); 126 static int lpmatch __P((struct device *, struct cfdata *, void *)); 127 128 struct cfattach lp_ca = { 129 sizeof(struct lpt_softc), lpmatch, lpattach 130 }; 131 132 extern struct cfdriver lp_cd; 133 134 /*ARGSUSED*/ 135 static int 136 lpmatch(pdp, cfp, auxp) 137 struct device *pdp; 138 struct cfdata *cfp; 139 void *auxp; 140 { 141 if (!strcmp((char *)auxp, "lpt") && cfp->cf_unit == 0) 142 return (1); 143 return (0); 144 } 145 146 /*ARGSUSED*/ 147 static void 148 lpattach(pdp, dp, auxp) 149 struct device *pdp, *dp; 150 void *auxp; 151 { 152 struct lpt_softc *sc = (void *)dp; 153 154 sc->sc_state = 0; 155 156 if (intr_establish(0, USER_VEC, 0, (hw_ifun_t)lpthwintr, sc) == NULL) 157 printf("lptattach: Can't establish interrupt\n"); 158 ym2149_strobe(1); 159 160 printf("\n"); 161 } 162 163 /* 164 * Reset the printer, then wait until it's selected and not busy. 165 */ 166 int 167 lpopen(dev, flag, mode, p) 168 dev_t dev; 169 int flag, mode; 170 struct proc *p; 171 { 172 int unit = LPTUNIT(dev); 173 u_char flags = LPTFLAGS(dev); 174 struct lpt_softc *sc; 175 int error; 176 int spin; 177 int sps; 178 179 if (unit >= lp_cd.cd_ndevs) 180 return ENXIO; 181 sc = lp_cd.cd_devs[unit]; 182 if (!sc) 183 return ENXIO; 184 185 #ifdef DIAGNOSTIC 186 if (sc->sc_state) 187 printf("%s: stat=0x%x not zero\n", sc->sc_dev.dv_xname, 188 sc->sc_state); 189 #endif 190 191 if (sc->sc_state) 192 return EBUSY; 193 194 sc->sc_state = LPT_INIT; 195 sc->sc_flags = flags; 196 lprintf("%s: open: flags=0x%x\n", sc->sc_dev.dv_xname, flags); 197 198 /* wait till ready (printer running diagnostics) */ 199 for (spin = 0; NOT_READY(); spin += STEP) { 200 if (spin >= TIMEOUT) { 201 sc->sc_state = 0; 202 return EBUSY; 203 } 204 205 /* wait 1/4 second, give up if we get a signal */ 206 if ((error = tsleep((caddr_t)sc, LPTPRI | PCATCH, "lptopen", 207 STEP)) != EWOULDBLOCK) { 208 sc->sc_state = 0; 209 return error; 210 } 211 } 212 213 sc->sc_inbuf = geteblk(LPT_BSIZE); 214 sc->sc_count = 0; 215 sc->sc_state = LPT_OPEN; 216 217 if ((sc->sc_flags & LPT_NOINTR) == 0) { 218 lptwakeup(sc); 219 220 sps = splhigh(); 221 MFP->mf_imrb |= IB_PBSY; 222 MFP->mf_ierb |= IB_PBSY; 223 splx(sps); 224 } 225 226 lprintf("%s: opened\n", sc->sc_dev.dv_xname); 227 return 0; 228 } 229 230 void 231 lptwakeup(arg) 232 void *arg; 233 { 234 struct lpt_softc *sc = arg; 235 236 lptpseudointr(sc); 237 238 timeout(lptwakeup, sc, STEP); 239 } 240 241 /* 242 * Close the device, and free the local line buffer. 243 */ 244 int 245 lpclose(dev, flag, mode, p) 246 dev_t dev; 247 int flag; 248 int mode; 249 struct proc *p; 250 { 251 int unit = LPTUNIT(dev); 252 struct lpt_softc *sc = lp_cd.cd_devs[unit]; 253 int sps; 254 255 if (sc->sc_count) 256 (void) pushbytes(sc); 257 258 if ((sc->sc_flags & LPT_NOINTR) == 0) { 259 untimeout(lptwakeup, sc); 260 261 sps = splhigh(); 262 MFP->mf_ierb &= ~IB_PBSY; 263 MFP->mf_imrb &= ~IB_PBSY; 264 splx(sps); 265 } 266 267 sc->sc_state = 0; 268 brelse(sc->sc_inbuf); 269 270 lprintf("%s: closed\n", sc->sc_dev.dv_xname); 271 return 0; 272 } 273 274 int 275 pushbytes(sc) 276 struct lpt_softc *sc; 277 { 278 int error; 279 280 if (sc->sc_flags & LPT_NOINTR) { 281 int spin, tic; 282 283 while (sc->sc_count > 0) { 284 spin = 0; 285 while (NOT_READY()) { 286 if (++spin < sc->sc_spinmax) 287 continue; 288 tic = 0; 289 /* adapt busy-wait algorithm */ 290 sc->sc_spinmax++; 291 while (NOT_READY()) { 292 /* exponential backoff */ 293 tic = tic + tic + 1; 294 if (tic > TIMEOUT) 295 tic = TIMEOUT; 296 error = tsleep((caddr_t)sc, 297 LPTPRI | PCATCH, "lptpsh", tic); 298 if (error != EWOULDBLOCK) 299 return error; 300 } 301 break; 302 } 303 304 ym2149_write_ioport(YM_IOB, *sc->sc_cp++); 305 ym2149_strobe(0); 306 sc->sc_count--; 307 ym2149_strobe(1); 308 309 /* adapt busy-wait algorithm */ 310 if (spin*2 + 16 < sc->sc_spinmax) 311 sc->sc_spinmax--; 312 } 313 } else { 314 while (sc->sc_count > 0) { 315 /* if the printer is ready for a char, give it one */ 316 if ((sc->sc_state & LPT_OBUSY) == 0) { 317 lprintf("%s: write %d\n", sc->sc_dev.dv_xname, 318 sc->sc_count); 319 (void) lptpseudointr(sc); 320 } 321 if ((error = tsleep((caddr_t)sc, LPTPRI | PCATCH, 322 "lptwrite2", 0)) != 0) 323 return error; 324 } 325 } 326 return 0; 327 } 328 329 /* 330 * Copy a line from user space to a local buffer, then call putc to get the 331 * chars moved to the output queue. 332 */ 333 int 334 lpwrite(dev, uio, flags) 335 dev_t dev; 336 struct uio *uio; 337 int flags; 338 { 339 struct lpt_softc *sc = lp_cd.cd_devs[LPTUNIT(dev)]; 340 size_t n; 341 int error = 0; 342 343 while ((n = min(LPT_BSIZE, uio->uio_resid)) > 0) { 344 uiomove(sc->sc_cp = sc->sc_inbuf->b_data, n, uio); 345 sc->sc_count = n; 346 error = pushbytes(sc); 347 if (error) { 348 /* 349 * Return accurate residual if interrupted or timed 350 * out. 351 */ 352 uio->uio_resid += sc->sc_count; 353 sc->sc_count = 0; 354 return error; 355 } 356 } 357 return 0; 358 } 359 360 /* 361 * Handle printer interrupts which occur when the printer is ready to accept 362 * another char. 363 */ 364 int 365 lptintr(sc) 366 struct lpt_softc *sc; 367 { 368 /* is printer online and ready for output */ 369 if (NOT_READY()) 370 return 0; 371 372 if (sc->sc_count) { 373 374 /* send char */ 375 ym2149_write_ioport(YM_IOB, *sc->sc_cp++); 376 ym2149_strobe(0); 377 sc->sc_count--; 378 ym2149_strobe(1); 379 sc->sc_state |= LPT_OBUSY; 380 } else 381 sc->sc_state &= ~LPT_OBUSY; 382 383 if (sc->sc_count == 0) { 384 /* none, wake up the top half to get more */ 385 wakeup((caddr_t)sc); 386 } 387 388 return 1; 389 } 390 391 static void 392 lptpseudointr(sc) 393 struct lpt_softc *sc; 394 { 395 int s; 396 397 s = spltty(); 398 lptintr(sc); 399 splx(s); 400 } 401 402 int 403 lpthwintr(sc, sr) 404 struct lpt_softc *sc; 405 int sr; 406 { 407 if (!BASEPRI(sr)) 408 add_sicallback((si_farg)lptpseudointr, sc, 0); 409 else lptpseudointr(sc); 410 return 1; 411 } 412 413 int 414 lpioctl(dev, cmd, data, flag, p) 415 dev_t dev; 416 u_long cmd; 417 caddr_t data; 418 int flag; 419 struct proc *p; 420 { 421 int error = 0; 422 423 switch (cmd) { 424 default: 425 error = ENODEV; 426 } 427 428 return error; 429 } 430
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