lpt.c revision 1.36
1 /* $NetBSD: lpt.c,v 1.36 2014/03/16 05:20:23 dholland 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 1.36 2014/03/16 05:20:23 dholland 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/buf.h> 66 #include <sys/kernel.h> 67 #include <sys/ioctl.h> 68 #include <sys/uio.h> 69 #include <sys/device.h> 70 #include <sys/conf.h> 71 #include <sys/syslog.h> 72 73 #include <machine/cpu.h> 74 #include <machine/iomap.h> 75 #include <machine/mfp.h> 76 #include <machine/intr.h> 77 78 #include <atari/dev/ym2149reg.h> 79 80 #include "ioconf.h" 81 82 #define TIMEOUT hz*16 /* wait up to 16 seconds for a ready */ 83 #define STEP hz/4 84 85 #define LPTPRI (PZERO+8) 86 #define LPT_BSIZE 1024 87 88 #if !defined(DEBUG) || !defined(notdef) 89 #define lprintf if (0) aprint_error_dev 90 #else 91 #define lprintf if (lptdebug) aprint_error_dev 92 int lptdebug = 1; 93 #endif 94 95 struct lpt_softc { 96 device_t sc_dev; 97 struct callout sc_wakeup_ch; 98 size_t sc_count; 99 struct buf *sc_inbuf; 100 u_char *sc_cp; 101 int sc_spinmax; 102 u_char sc_state; 103 #define LPT_OPEN 0x01 /* device is open */ 104 #define LPT_OBUSY 0x02 /* printer is busy doing output */ 105 #define LPT_INIT 0x04 /* waiting to initialize for open */ 106 u_char sc_flags; 107 #define LPT_AUTOLF 0x20 /* automatic LF on CR XXX: LWP - not yet... */ 108 #define LPT_NOINTR 0x40 /* do not use interrupt */ 109 void *sc_sicookie; 110 }; 111 112 #define LPTUNIT(s) (minor(s) & 0x1f) 113 #define LPTFLAGS(s) (minor(s) & 0xe0) 114 #define NOT_READY() (MFP->mf_gpip & IO_PBSY) 115 116 /* {b,c}devsw[] function prototypes */ 117 dev_type_open(lpopen); 118 dev_type_close(lpclose); 119 dev_type_write(lpwrite); 120 dev_type_ioctl(lpioctl); 121 122 static void lptwakeup (void *arg); 123 static int pushbytes (struct lpt_softc *); 124 static void lptpseudointr (void *); 125 int lptintr (struct lpt_softc *); 126 int lpthwintr (void *); 127 128 129 /* 130 * Autoconfig stuff 131 */ 132 static void lpattach (device_t, device_t, void *); 133 static int lpmatch (device_t, cfdata_t , void *); 134 135 CFATTACH_DECL_NEW(lp, sizeof(struct lpt_softc), 136 lpmatch, lpattach, NULL, NULL); 137 138 const struct cdevsw lp_cdevsw = { 139 .d_open = lpopen, 140 .d_close = lpclose, 141 .d_read = noread, 142 .d_write = lpwrite, 143 .d_ioctl = lpioctl, 144 .d_stop = nostop, 145 .d_tty = notty, 146 .d_poll = nopoll, 147 .d_mmap = nommap, 148 .d_kqfilter = nokqfilter, 149 .d_flag = 0 150 }; 151 152 /*ARGSUSED*/ 153 static int 154 lpmatch(device_t parent, cfdata_t cf, void *aux) 155 { 156 static int lpt_matched = 0; 157 158 /* Match at most 1 lpt unit */ 159 if (strcmp((char *)aux, "lpt") || lpt_matched) 160 return 0; 161 lpt_matched = 1; 162 return (1); 163 } 164 165 /*ARGSUSED*/ 166 static void 167 lpattach(device_t parent, device_t self, void *aux) 168 { 169 struct lpt_softc *sc = device_private(self); 170 171 sc->sc_dev = self; 172 sc->sc_state = 0; 173 174 aprint_normal("\n"); 175 176 if (intr_establish(0, USER_VEC, 0, (hw_ifun_t)lpthwintr, sc) == NULL) 177 aprint_error_dev(self, "Can't establish interrupt\n"); 178 ym2149_strobe(1); 179 sc->sc_sicookie = softint_establish(SOFTINT_SERIAL, lptpseudointr, sc); 180 181 callout_init(&sc->sc_wakeup_ch, 0); 182 } 183 184 /* 185 * Reset the printer, then wait until it's selected and not busy. 186 */ 187 int 188 lpopen(dev_t dev, int flag, int mode, struct lwp *l) 189 { 190 u_char flags = LPTFLAGS(dev); 191 struct lpt_softc *sc; 192 int error; 193 int spin; 194 int sps; 195 196 sc = device_lookup_private(&lp_cd, LPTUNIT(dev)); 197 if (!sc) 198 return ENXIO; 199 200 #ifdef DIAGNOSTIC 201 if (sc->sc_state) 202 aprint_verbose_dev(sc->sc_dev, "stat=0x%x not zero\n", 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(sc->sc_dev, "open: flags=0x%x\n", 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(sc->sc_dev, "opened\n"); 242 return 0; 243 } 244 245 void 246 lptwakeup(void *arg) 247 { 248 struct lpt_softc *sc = arg; 249 250 lptpseudointr(sc); 251 252 callout_reset(&sc->sc_wakeup_ch, STEP, lptwakeup, sc); 253 } 254 255 /* 256 * Close the device, and free the local line buffer. 257 */ 258 int 259 lpclose(dev_t dev, int flag, int mode, struct lwp *l) 260 { 261 struct lpt_softc *sc = device_lookup_private(&lp_cd, LPTUNIT(dev)); 262 int sps; 263 264 if (sc->sc_count) 265 (void) pushbytes(sc); 266 267 if ((sc->sc_flags & LPT_NOINTR) == 0) { 268 callout_stop(&sc->sc_wakeup_ch); 269 270 sps = splhigh(); 271 MFP->mf_ierb &= ~IB_PBSY; 272 MFP->mf_imrb &= ~IB_PBSY; 273 splx(sps); 274 } 275 276 sc->sc_state = 0; 277 brelse(sc->sc_inbuf, 0); 278 279 lprintf(sc->sc_dev, "closed\n"); 280 return 0; 281 } 282 283 int 284 pushbytes(struct lpt_softc *sc) 285 { 286 int error; 287 288 if (sc->sc_flags & LPT_NOINTR) { 289 int spin, tic; 290 291 while (sc->sc_count > 0) { 292 spin = 0; 293 while (NOT_READY()) { 294 if (++spin < sc->sc_spinmax) 295 continue; 296 tic = 0; 297 /* adapt busy-wait algorithm */ 298 sc->sc_spinmax++; 299 while (NOT_READY()) { 300 /* exponential backoff */ 301 tic = tic + tic + 1; 302 if (tic > TIMEOUT) 303 tic = TIMEOUT; 304 error = tsleep((void *)sc, 305 LPTPRI | PCATCH, "lptpsh", tic); 306 if (error != EWOULDBLOCK) 307 return error; 308 } 309 break; 310 } 311 312 ym2149_write_ioport(YM_IOB, *sc->sc_cp++); 313 ym2149_strobe(0); 314 sc->sc_count--; 315 ym2149_strobe(1); 316 317 /* adapt busy-wait algorithm */ 318 if (spin*2 + 16 < sc->sc_spinmax) 319 sc->sc_spinmax--; 320 } 321 } else { 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(sc->sc_dev, "write %d\n", 326 sc->sc_count); 327 (void) lptpseudointr(sc); 328 } 329 if ((error = tsleep((void *)sc, LPTPRI | PCATCH, 330 "lptwrite2", 0)) != 0) 331 return error; 332 } 333 } 334 return 0; 335 } 336 337 /* 338 * Copy a line from user space to a local buffer, then call putc to get the 339 * chars moved to the output queue. 340 */ 341 int 342 lpwrite(dev_t dev, struct uio *uio, int flags) 343 { 344 struct lpt_softc *sc = device_lookup_private(&lp_cd,LPTUNIT(dev)); 345 size_t n; 346 int error = 0; 347 348 while ((n = min(LPT_BSIZE, uio->uio_resid)) > 0) { 349 uiomove(sc->sc_cp = sc->sc_inbuf->b_data, n, uio); 350 sc->sc_count = n; 351 error = pushbytes(sc); 352 if (error) { 353 /* 354 * Return accurate residual if interrupted or timed 355 * out. 356 */ 357 uio->uio_resid += sc->sc_count; 358 sc->sc_count = 0; 359 return error; 360 } 361 } 362 return 0; 363 } 364 365 /* 366 * Handle printer interrupts which occur when the printer is ready to accept 367 * another char. 368 */ 369 int 370 lptintr(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((void *)sc); 390 } 391 392 return 1; 393 } 394 395 static void 396 lptpseudointr(void *arg) 397 { 398 struct lpt_softc *sc; 399 int s; 400 401 sc = arg; 402 s = spltty(); 403 lptintr(sc); 404 splx(s); 405 } 406 407 int 408 lpthwintr(void *arg) 409 { 410 struct lpt_softc *sc; 411 412 sc = arg; 413 softint_schedule(sc->sc_sicookie); 414 return 1; 415 } 416 417 int 418 lpioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 419 { 420 int error = 0; 421 422 switch (cmd) { 423 default: 424 error = ENODEV; 425 } 426 427 return error; 428 } 429
Indexes created Tue Sep 30 11:09:46 GMT 2025