1 /* $NetBSD: lpt.c,v 1.40 2023/01/06 10:28:28 tsutsui 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 1.40 2023/01/06 10:28:28 tsutsui 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 static dev_type_open(lpopen); 118 static dev_type_close(lpclose); 119 static dev_type_write(lpwrite); 120 static 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_discard = nodiscard, 150 .d_flag = 0 151 }; 152 153 /*ARGSUSED*/ 154 static int 155 lpmatch(device_t parent, cfdata_t cf, void *aux) 156 { 157 static int lpt_matched = 0; 158 159 /* Match at most 1 lpt unit */ 160 if (strcmp((char *)aux, "lpt") || lpt_matched) 161 return 0; 162 lpt_matched = 1; 163 return (1); 164 } 165 166 /*ARGSUSED*/ 167 static void 168 lpattach(device_t parent, device_t self, void *aux) 169 { 170 struct lpt_softc *sc = device_private(self); 171 172 sc->sc_dev = self; 173 sc->sc_state = 0; 174 175 aprint_normal("\n"); 176 177 if (intr_establish(0, USER_VEC, 0, (hw_ifun_t)lpthwintr, sc) == NULL) 178 aprint_error_dev(self, "Can't establish interrupt\n"); 179 ym2149_strobe(1); 180 sc->sc_sicookie = softint_establish(SOFTINT_SERIAL, lptpseudointr, sc); 181 182 callout_init(&sc->sc_wakeup_ch, 0); 183 } 184 185 /* 186 * Reset the printer, then wait until it's selected and not busy. 187 */ 188 static int 189 lpopen(dev_t dev, int flag, int mode, struct lwp *l) 190 { 191 u_char flags = LPTFLAGS(dev); 192 struct lpt_softc *sc; 193 int error; 194 int spin; 195 int sps; 196 197 sc = device_lookup_private(&lp_cd, LPTUNIT(dev)); 198 if (!sc) 199 return ENXIO; 200 201 #ifdef DIAGNOSTIC 202 if (sc->sc_state) 203 aprint_verbose_dev(sc->sc_dev, "stat=0x%x not zero\n", 204 sc->sc_state); 205 #endif 206 207 if (sc->sc_state) 208 return EBUSY; 209 210 sc->sc_state = LPT_INIT; 211 sc->sc_flags = flags; 212 lprintf(sc->sc_dev, "open: flags=0x%x\n", flags); 213 214 /* wait till ready (printer running diagnostics) */ 215 for (spin = 0; NOT_READY(); spin += STEP) { 216 if (spin >= TIMEOUT) { 217 sc->sc_state = 0; 218 return EBUSY; 219 } 220 221 /* wait 1/4 second, give up if we get a signal */ 222 if ((error = tsleep((void *)sc, LPTPRI | PCATCH, "lptopen", 223 STEP)) != EWOULDBLOCK) { 224 sc->sc_state = 0; 225 return error; 226 } 227 } 228 229 sc->sc_inbuf = geteblk(LPT_BSIZE); 230 sc->sc_count = 0; 231 sc->sc_state = LPT_OPEN; 232 233 if ((sc->sc_flags & LPT_NOINTR) == 0) { 234 lptwakeup(sc); 235 236 sps = splhigh(); 237 MFP->mf_imrb |= IB_PBSY; 238 MFP->mf_ierb |= IB_PBSY; 239 splx(sps); 240 } 241 242 lprintf(sc->sc_dev, "opened\n"); 243 return 0; 244 } 245 246 void 247 lptwakeup(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 static int 260 lpclose(dev_t dev, int flag, int mode, struct lwp *l) 261 { 262 struct lpt_softc *sc = device_lookup_private(&lp_cd, LPTUNIT(dev)); 263 int sps; 264 265 if (sc->sc_count) 266 (void) pushbytes(sc); 267 268 if ((sc->sc_flags & LPT_NOINTR) == 0) { 269 callout_stop(&sc->sc_wakeup_ch); 270 271 sps = splhigh(); 272 MFP->mf_ierb &= ~IB_PBSY; 273 MFP->mf_imrb &= ~IB_PBSY; 274 splx(sps); 275 } 276 277 sc->sc_state = 0; 278 brelse(sc->sc_inbuf, 0); 279 280 lprintf(sc->sc_dev, "closed\n"); 281 return 0; 282 } 283 284 int 285 pushbytes(struct lpt_softc *sc) 286 { 287 int error; 288 289 if (sc->sc_flags & LPT_NOINTR) { 290 int spin, tic; 291 292 while (sc->sc_count > 0) { 293 spin = 0; 294 while (NOT_READY()) { 295 if (++spin < sc->sc_spinmax) 296 continue; 297 tic = 0; 298 /* adapt busy-wait algorithm */ 299 sc->sc_spinmax++; 300 while (NOT_READY()) { 301 /* exponential backoff */ 302 tic = tic + tic + 1; 303 if (tic > TIMEOUT) 304 tic = TIMEOUT; 305 error = tsleep((void *)sc, 306 LPTPRI | PCATCH, "lptpsh", tic); 307 if (error != EWOULDBLOCK) 308 return error; 309 } 310 break; 311 } 312 313 ym2149_write_ioport(YM_IOB, *sc->sc_cp++); 314 ym2149_strobe(0); 315 sc->sc_count--; 316 ym2149_strobe(1); 317 318 /* adapt busy-wait algorithm */ 319 if (spin*2 + 16 < sc->sc_spinmax) 320 sc->sc_spinmax--; 321 } 322 } else { 323 while (sc->sc_count > 0) { 324 /* if the printer is ready for a char, give it one */ 325 if ((sc->sc_state & LPT_OBUSY) == 0) { 326 lprintf(sc->sc_dev, "write %d\n", 327 sc->sc_count); 328 (void) lptpseudointr(sc); 329 } 330 if ((error = tsleep((void *)sc, LPTPRI | PCATCH, 331 "lptwrite2", 0)) != 0) 332 return error; 333 } 334 } 335 return 0; 336 } 337 338 /* 339 * Copy a line from user space to a local buffer, then call putc to get the 340 * chars moved to the output queue. 341 */ 342 static int 343 lpwrite(dev_t dev, struct uio *uio, int flags) 344 { 345 struct lpt_softc *sc = device_lookup_private(&lp_cd,LPTUNIT(dev)); 346 size_t n; 347 int error = 0; 348 349 while ((n = uimin(LPT_BSIZE, uio->uio_resid)) > 0) { 350 uiomove(sc->sc_cp = sc->sc_inbuf->b_data, n, uio); 351 sc->sc_count = n; 352 error = pushbytes(sc); 353 if (error) { 354 /* 355 * Return accurate residual if interrupted or timed 356 * out. 357 */ 358 uio->uio_resid += sc->sc_count; 359 sc->sc_count = 0; 360 return error; 361 } 362 } 363 return 0; 364 } 365 366 /* 367 * Handle printer interrupts which occur when the printer is ready to accept 368 * another char. 369 */ 370 int 371 lptintr(struct lpt_softc *sc) 372 { 373 /* is printer online and ready for output */ 374 if (NOT_READY()) 375 return 0; 376 377 if (sc->sc_count) { 378 379 /* send char */ 380 ym2149_write_ioport(YM_IOB, *sc->sc_cp++); 381 ym2149_strobe(0); 382 sc->sc_count--; 383 ym2149_strobe(1); 384 sc->sc_state |= LPT_OBUSY; 385 } else 386 sc->sc_state &= ~LPT_OBUSY; 387 388 if (sc->sc_count == 0) { 389 /* none, wake up the top half to get more */ 390 wakeup((void *)sc); 391 } 392 393 return 1; 394 } 395 396 static void 397 lptpseudointr(void *arg) 398 { 399 struct lpt_softc *sc; 400 int s; 401 402 sc = arg; 403 s = spltty(); 404 lptintr(sc); 405 splx(s); 406 } 407 408 int 409 lpthwintr(void *arg) 410 { 411 struct lpt_softc *sc; 412 413 sc = arg; 414 softint_schedule(sc->sc_sicookie); 415 return 1; 416 } 417 418 static int 419 lpioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 420 { 421 int error = 0; 422 423 switch (cmd) { 424 default: 425 error = ENODEV; 426 } 427 428 return error; 429 } 430
Indexes created Tue Sep 30 17:09:57 GMT 2025