1 /* $NetBSD: lpt.c,v 1.6 1996/10/13 04:11:05 christos 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 76 #define TIMEOUT hz*16 /* wait up to 16 seconds for a ready */ 77 #define STEP hz/4 78 79 #define LPTPRI (PZERO+8) 80 #define LPT_BSIZE 1024 81 82 #if !defined(DEBUG) || !defined(notdef) 83 #define lprintf if (0) printf 84 #else 85 #define lprintf if (lptdebug) printf 86 int lptdebug = 1; 87 #endif 88 89 struct lpt_softc { 90 struct device sc_dev; 91 size_t sc_count; 92 struct buf *sc_inbuf; 93 u_char *sc_cp; 94 int sc_spinmax; 95 u_char sc_state; 96 #define LPT_OPEN 0x01 /* device is open */ 97 #define LPT_OBUSY 0x02 /* printer is busy doing output */ 98 #define LPT_INIT 0x04 /* waiting to initialize for open */ 99 u_char sc_flags; 100 #define LPT_AUTOLF 0x20 /* automatic LF on CR XXX: LWP - not yet... */ 101 #define LPT_NOINTR 0x40 /* do not use interrupt */ 102 }; 103 104 #define LPTUNIT(s) (minor(s) & 0x1f) 105 #define LPTFLAGS(s) (minor(s) & 0xe0) 106 #define NOT_READY() (MFP->mf_gpip & IO_PBSY) 107 108 /* {b,c}devsw[] function prototypes */ 109 dev_type_open(lptopen); 110 dev_type_close(lptclose); 111 dev_type_write(lptwrite); 112 dev_type_ioctl(lptioctl); 113 114 static void lptwakeup __P((void *arg)); 115 static int pushbytes __P((struct lpt_softc *)); 116 117 int lptintr __P((void)); 118 119 /* 120 * Autoconfig stuff 121 */ 122 static void lptattach __P((struct device *, struct device *, void *)); 123 static int lptmatch __P((struct device *, void *, void *)); 124 125 struct cfattach lpt_ca = { 126 sizeof(struct lpt_softc), lptmatch, lptattach 127 }; 128 129 struct cfdriver lpt_cd = { 130 NULL, "lpt", DV_DULL, NULL, 0 131 }; 132 133 /*ARGSUSED*/ 134 static int 135 lptmatch(pdp, match, auxp) 136 struct device *pdp; 137 void *match, *auxp; 138 { 139 struct cfdata *cfp = match; 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 lptattach(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 ym2149_strobe(1); 157 158 printf("\n"); 159 } 160 161 /* 162 * Reset the printer, then wait until it's selected and not busy. 163 */ 164 int 165 lptopen(dev, flag, mode, p) 166 dev_t dev; 167 int flag, mode; 168 struct proc *p; 169 { 170 int unit = LPTUNIT(dev); 171 u_char flags = LPTFLAGS(dev); 172 struct lpt_softc *sc; 173 int error; 174 int spin; 175 int sps; 176 177 if (unit >= lpt_cd.cd_ndevs) 178 return ENXIO; 179 sc = lpt_cd.cd_devs[unit]; 180 if (!sc) 181 return ENXIO; 182 183 #ifdef DIAGNOSTIC 184 if (sc->sc_state) 185 printf("%s: stat=0x%x not zero\n", sc->sc_dev.dv_xname, 186 sc->sc_state); 187 #endif 188 189 if (sc->sc_state) 190 return EBUSY; 191 192 sc->sc_state = LPT_INIT; 193 sc->sc_flags = flags; 194 lprintf("%s: open: flags=0x%x\n", sc->sc_dev.dv_xname, flags); 195 196 /* wait till ready (printer running diagnostics) */ 197 for (spin = 0; NOT_READY(); spin += STEP) { 198 if (spin >= TIMEOUT) { 199 sc->sc_state = 0; 200 return EBUSY; 201 } 202 203 /* wait 1/4 second, give up if we get a signal */ 204 if ((error = tsleep((caddr_t)sc, LPTPRI | PCATCH, "lptopen", 205 STEP)) != EWOULDBLOCK) { 206 sc->sc_state = 0; 207 return error; 208 } 209 } 210 211 sc->sc_inbuf = geteblk(LPT_BSIZE); 212 sc->sc_count = 0; 213 sc->sc_state = LPT_OPEN; 214 215 if ((sc->sc_flags & LPT_NOINTR) == 0) { 216 lptwakeup(sc); 217 218 sps = splhigh(); 219 MFP->mf_imrb |= IB_PBSY; 220 MFP->mf_ierb |= IB_PBSY; 221 splx(sps); 222 } 223 224 lprintf("%s: opened\n", sc->sc_dev.dv_xname); 225 return 0; 226 } 227 228 void 229 lptwakeup(arg) 230 void *arg; 231 { 232 struct lpt_softc *sc = arg; 233 int s; 234 235 s = spltty(); 236 lptintr(); 237 splx(s); 238 239 timeout(lptwakeup, sc, STEP); 240 } 241 242 /* 243 * Close the device, and free the local line buffer. 244 */ 245 int 246 lptclose(dev, flag, mode, p) 247 dev_t dev; 248 int flag; 249 int mode; 250 struct proc *p; 251 { 252 int unit = LPTUNIT(dev); 253 struct lpt_softc *sc = lpt_cd.cd_devs[unit]; 254 int sps; 255 256 if (sc->sc_count) 257 (void) pushbytes(sc); 258 259 if ((sc->sc_flags & LPT_NOINTR) == 0) { 260 untimeout(lptwakeup, sc); 261 262 sps = splhigh(); 263 MFP->mf_ierb &= ~IB_PBSY; 264 MFP->mf_imrb &= ~IB_PBSY; 265 splx(sps); 266 } 267 268 sc->sc_state = 0; 269 brelse(sc->sc_inbuf); 270 271 lprintf("%s: closed\n", sc->sc_dev.dv_xname); 272 return 0; 273 } 274 275 int 276 pushbytes(sc) 277 struct lpt_softc *sc; 278 { 279 int error; 280 281 if (sc->sc_flags & LPT_NOINTR) { 282 int spin, tic; 283 284 while (sc->sc_count > 0) { 285 spin = 0; 286 while (NOT_READY()) { 287 if (++spin < sc->sc_spinmax) 288 continue; 289 tic = 0; 290 /* adapt busy-wait algorithm */ 291 sc->sc_spinmax++; 292 while (NOT_READY()) { 293 /* exponential backoff */ 294 tic = tic + tic + 1; 295 if (tic > TIMEOUT) 296 tic = TIMEOUT; 297 error = tsleep((caddr_t)sc, 298 LPTPRI | PCATCH, "lptpsh", tic); 299 if (error != EWOULDBLOCK) 300 return error; 301 } 302 break; 303 } 304 305 ym2149_write_ioport(YM_IOB, *sc->sc_cp++); 306 ym2149_strobe(0); 307 sc->sc_count--; 308 ym2149_strobe(1); 309 310 /* adapt busy-wait algorithm */ 311 if (spin*2 + 16 < sc->sc_spinmax) 312 sc->sc_spinmax--; 313 } 314 } else { 315 int s; 316 317 while (sc->sc_count > 0) { 318 /* if the printer is ready for a char, give it one */ 319 if ((sc->sc_state & LPT_OBUSY) == 0) { 320 lprintf("%s: write %d\n", sc->sc_dev.dv_xname, 321 sc->sc_count); 322 s = spltty(); 323 (void) lptintr(); 324 splx(s); 325 } 326 if ((error = tsleep((caddr_t)sc, LPTPRI | PCATCH, 327 "lptwrite2", 0)) != 0) 328 return error; 329 } 330 } 331 return 0; 332 } 333 334 /* 335 * Copy a line from user space to a local buffer, then call putc to get the 336 * chars moved to the output queue. 337 */ 338 int 339 lptwrite(dev, uio, flags) 340 dev_t dev; 341 struct uio *uio; 342 int flags; 343 { 344 struct lpt_softc *sc = lpt_cd.cd_devs[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() 371 { 372 struct lpt_softc *sc; 373 374 sc = lpt_cd.cd_devs[0]; /* XXX: LWP - we have only one on the Atari */ 375 376 /* is printer online and ready for output */ 377 if (NOT_READY()) 378 return 0; 379 380 if (sc->sc_count) { 381 382 /* send char */ 383 ym2149_write_ioport(YM_IOB, *sc->sc_cp++); 384 ym2149_strobe(0); 385 sc->sc_count--; 386 ym2149_strobe(1); 387 sc->sc_state |= LPT_OBUSY; 388 } else 389 sc->sc_state &= ~LPT_OBUSY; 390 391 if (sc->sc_count == 0) { 392 /* none, wake up the top half to get more */ 393 wakeup((caddr_t)sc); 394 } 395 396 return 1; 397 } 398 399 int 400 lptioctl(dev, cmd, data, flag, p) 401 dev_t dev; 402 u_long cmd; 403 caddr_t data; 404 int flag; 405 struct proc *p; 406 { 407 int error = 0; 408 409 switch (cmd) { 410 default: 411 error = ENODEV; 412 } 413 414 return error; 415 } 416