sys/dev/ppbus/ppi.c

   1 /*-
   2  * Copyright (c) 1997, 1998, 1999 Nicolas Souchu, Michael Smith
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  *
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __FBSDID("$FreeBSD$");
  31 #include "opt_ppb_1284.h"
  32
  33 #include <sys/param.h>
  34 #include <sys/systm.h>
  35 #include <sys/module.h>
  36 #include <sys/bus.h>
  37 #include <sys/conf.h>
  38 #include <sys/kernel.h>
  39 #include <sys/uio.h>
  40 #include <sys/fcntl.h>
  41
  42 #include <machine/bus.h>
  43 #include <machine/resource.h>
  44 #include <sys/rman.h>
  45
  46 #include <dev/ppbus/ppbconf.h>
  47 #include <dev/ppbus/ppb_msq.h>
  48
  49 #ifdef PERIPH_1284
  50 #include <dev/ppbus/ppb_1284.h>
  51 #endif
  52
  53 #include <dev/ppbus/ppi.h>
  54
  55 #include "ppbus_if.h"
  56
  57 #include <dev/ppbus/ppbio.h>
  58
  59 #define BUFSIZE         512
  60
  61 struct ppi_data {
  62
  63     int         ppi_unit;
  64     int         ppi_flags;
  65 #define HAVE_PPBUS      (1<<0)
  66 #define HAD_PPBUS       (1<<1)
  67
  68     int         ppi_count;
  69     int         ppi_mode;                       /* IEEE1284 mode */
  70     char        ppi_buffer[BUFSIZE];
  71
  72 #ifdef PERIPH_1284
  73     struct resource *intr_resource;     /* interrupt resource */
  74     void *intr_cookie;                  /* interrupt registration cookie */
  75 #endif /* PERIPH_1284 */
  76 };
  77
  78 #define DEVTOSOFTC(dev) \
  79         ((struct ppi_data *)device_get_softc(dev))
  80 #define UNITOSOFTC(unit) \
  81         ((struct ppi_data *)devclass_get_softc(ppi_devclass, (unit)))
  82 #define UNITODEVICE(unit) \
  83         (devclass_get_device(ppi_devclass, (unit)))
  84
  85 static devclass_t ppi_devclass;
  86
  87 static  d_open_t        ppiopen;
  88 static  d_close_t       ppiclose;
  89 static  d_ioctl_t       ppiioctl;
  90 static  d_write_t       ppiwrite;
  91 static  d_read_t        ppiread;
  92
  93 static struct cdevsw ppi_cdevsw = {
  94         .d_version =    D_VERSION,
  95         .d_flags =      D_NEEDGIANT,
  96         .d_open =       ppiopen,
  97         .d_close =      ppiclose,
  98         .d_read =       ppiread,
  99         .d_write =      ppiwrite,
 100         .d_ioctl =      ppiioctl,
 101         .d_name =       "ppi",
 102 };
 103
 104 #ifdef PERIPH_1284
 105
 106 static void
 107 ppi_enable_intr(device_t ppidev)
 108 {
 109         char r;
 110         device_t ppbus = device_get_parent(ppidev);
 111
 112         r = ppb_rctr(ppbus);
 113         ppb_wctr(ppbus, r | IRQENABLE);
 114
 115         return;
 116 }
 117
 118 static void
 119 ppi_disable_intr(device_t ppidev)
 120 {
 121         char r;
 122         device_t ppbus = device_get_parent(ppidev);
 123
 124         r = ppb_rctr(ppbus);
 125         ppb_wctr(ppbus, r & ~IRQENABLE);
 126
 127         return;
 128 }
 129
 130 #endif /* PERIPH_1284 */
 131
 132 static void
 133 ppi_identify(driver_t *driver, device_t parent)
 134 {
 135
 136         device_t dev;
 137
 138         dev = device_find_child(parent, "ppi", -1);
 139         if (!dev)
 140                 BUS_ADD_CHILD(parent, 0, "ppi", -1);
 141 }
 142
 143 /*
 144  * ppi_probe()
 145  */
 146 static int
 147 ppi_probe(device_t dev)
 148 {
 149         struct ppi_data *ppi;
 150
 151         /* probe is always ok */
 152         device_set_desc(dev, "Parallel I/O");
 153
 154         ppi = DEVTOSOFTC(dev);
 155
 156         return (0);
 157 }
 158
 159 /*
 160  * ppi_attach()
 161  */
 162 static int
 163 ppi_attach(device_t dev)
 164 {
 165 #ifdef PERIPH_1284
 166         uintptr_t irq;
 167         int zero = 0;
 168         struct ppi_data *ppi = DEVTOSOFTC(dev);
 169
 170         /* retrive the irq */
 171         BUS_READ_IVAR(device_get_parent(dev), dev, PPBUS_IVAR_IRQ, &irq);
 172
 173         /* declare our interrupt handler */
 174         ppi->intr_resource = bus_alloc_resource(dev, SYS_RES_IRQ,
 175                                                 &zero, irq, irq, 1, RF_ACTIVE);
 176 #endif /* PERIPH_1284 */
 177
 178         make_dev(&ppi_cdevsw, device_get_unit(dev),     /* XXX cleanup */
 179                  UID_ROOT, GID_WHEEL,
 180                  0600, "ppi%d", device_get_unit(dev));
 181
 182         return (0);
 183 }
 184
 185 #ifdef PERIPH_1284
 186 /*
 187  * Cable
 188  * -----
 189  *
 190  * Use an IEEE1284 compliant (DB25/DB25) cable with the following tricks:
 191  *
 192  * nStrobe   <-> nAck           1  <-> 10
 193  * nAutofd   <-> Busy           11 <-> 14
 194  * nSelectin <-> Select         17 <-> 13
 195  * nInit     <-> nFault         15 <-> 16
 196  *
 197  */
 198 static void
 199 ppiintr(void *arg)
 200 {
 201         device_t ppidev = (device_t)arg;
 202         device_t ppbus = device_get_parent(ppidev);
 203         struct ppi_data *ppi = DEVTOSOFTC(ppidev);
 204
 205         ppi_disable_intr(ppidev);
 206
 207         switch (ppb_1284_get_state(ppbus)) {
 208
 209         /* accept IEEE1284 negotiation then wakeup a waiting process to
 210          * continue negotiation at process level */
 211         case PPB_FORWARD_IDLE:
 212                 /* Event 1 */
 213                 if ((ppb_rstr(ppbus) & (SELECT | nBUSY)) ==
 214                                                         (SELECT | nBUSY)) {
 215                         /* IEEE1284 negotiation */
 216 #ifdef DEBUG_1284
 217                         printf("N");
 218 #endif
 219
 220                         /* Event 2 - prepare for reading the ext. value */
 221                         ppb_wctr(ppbus, (PCD | STROBE | nINIT) & ~SELECTIN);
 222
 223                         ppb_1284_set_state(ppbus, PPB_NEGOCIATION);
 224
 225                 } else {
 226 #ifdef DEBUG_1284
 227                         printf("0x%x", ppb_rstr(ppbus));
 228 #endif
 229                         ppb_peripheral_terminate(ppbus, PPB_DONTWAIT);
 230                         break;
 231                 }
 232
 233                 /* wake up any process waiting for negotiation from
 234                  * remote master host */
 235
 236                 /* XXX should set a variable to warn the process about
 237                  * the interrupt */
 238
 239                 wakeup(ppi);
 240                 break;
 241         default:
 242 #ifdef DEBUG_1284
 243                 printf("?%d", ppb_1284_get_state(ppbus));
 244 #endif
 245                 ppb_1284_set_state(ppbus, PPB_FORWARD_IDLE);
 246                 ppb_set_mode(ppbus, PPB_COMPATIBLE);
 247                 break;
 248         }
 249
 250         ppi_enable_intr(ppidev);
 251
 252         return;
 253 }
 254 #endif /* PERIPH_1284 */
 255
 256 static int
 257 ppiopen(struct cdev *dev, int flags, int fmt, struct thread *td)
 258 {
 259         u_int unit = minor(dev);
 260         struct ppi_data *ppi = UNITOSOFTC(unit);
 261         device_t ppidev = UNITODEVICE(unit);
 262         device_t ppbus = device_get_parent(ppidev);
 263         int res;
 264
 265         if (!ppi)
 266                 return (ENXIO);
 267
 268         if (!(ppi->ppi_flags & HAVE_PPBUS)) {
 269                 if ((res = ppb_request_bus(ppbus, ppidev,
 270                         (flags & O_NONBLOCK) ? PPB_DONTWAIT :
 271                                                 (PPB_WAIT | PPB_INTR))))
 272                         return (res);
 273
 274                 ppi->ppi_flags |= HAVE_PPBUS;
 275
 276 #ifdef PERIPH_1284
 277                 if (ppi->intr_resource) {
 278                         /* register our interrupt handler */
 279                         bus_setup_intr(ppidev, ppi->intr_resource,
 280                                        INTR_TYPE_TTY, NULL, ppiintr, dev,
 281                                        &ppi->intr_cookie);
 282                 }
 283 #endif /* PERIPH_1284 */
 284         }
 285         ppi->ppi_count += 1;
 286
 287         return (0);
 288 }
 289
 290 static int
 291 ppiclose(struct cdev *dev, int flags, int fmt, struct thread *td)
 292 {
 293         u_int unit = minor(dev);
 294         struct ppi_data *ppi = UNITOSOFTC(unit);
 295         device_t ppidev = UNITODEVICE(unit);
 296         device_t ppbus = device_get_parent(ppidev);
 297
 298         ppi->ppi_count --;
 299         if (!ppi->ppi_count) {
 300
 301 #ifdef PERIPH_1284
 302                 switch (ppb_1284_get_state(ppbus)) {
 303                 case PPB_PERIPHERAL_IDLE:
 304                         ppb_peripheral_terminate(ppbus, 0);
 305                         break;
 306                 case PPB_REVERSE_IDLE:
 307                 case PPB_EPP_IDLE:
 308                 case PPB_ECP_FORWARD_IDLE:
 309                 default:
 310                         ppb_1284_terminate(ppbus);
 311                         break;
 312                 }
 313 #endif /* PERIPH_1284 */
 314
 315                 /* unregistration of interrupt forced by release */
 316                 ppb_release_bus(ppbus, ppidev);
 317
 318                 ppi->ppi_flags &= ~HAVE_PPBUS;
 319         }
 320
 321         return (0);
 322 }
 323
 324 /*
 325  * ppiread()
 326  *
 327  * IEEE1284 compliant read.
 328  *
 329  * First, try negotiation to BYTE then NIBBLE mode
 330  * If no data is available, wait for it otherwise transfer as much as possible
 331  */
 332 static int
 333 ppiread(struct cdev *dev, struct uio *uio, int ioflag)
 334 {
 335 #ifdef PERIPH_1284
 336         u_int unit = minor(dev);
 337         struct ppi_data *ppi = UNITOSOFTC(unit);
 338         device_t ppidev = UNITODEVICE(unit);
 339         device_t ppbus = device_get_parent(ppidev);
 340         int len, error = 0;
 341
 342         switch (ppb_1284_get_state(ppbus)) {
 343         case PPB_PERIPHERAL_IDLE:
 344                 ppb_peripheral_terminate(ppbus, 0);
 345                 /* FALLTHROUGH */
 346
 347         case PPB_FORWARD_IDLE:
 348                 /* if can't negotiate NIBBLE mode then try BYTE mode,
 349                  * the peripheral may be a computer
 350                  */
 351                 if ((ppb_1284_negociate(ppbus,
 352                         ppi->ppi_mode = PPB_NIBBLE, 0))) {
 353
 354                         /* XXX Wait 2 seconds to let the remote host some
 355                          * time to terminate its interrupt
 356                          */
 357                         tsleep(ppi, PPBPRI, "ppiread", 2*hz);
 358
 359                         if ((error = ppb_1284_negociate(ppbus,
 360                                 ppi->ppi_mode = PPB_BYTE, 0)))
 361                                 return (error);
 362                 }
 363                 break;
 364
 365         case PPB_REVERSE_IDLE:
 366         case PPB_EPP_IDLE:
 367         case PPB_ECP_FORWARD_IDLE:
 368         default:
 369                 break;
 370         }
 371
 372 #ifdef DEBUG_1284
 373         printf("N");
 374 #endif
 375         /* read data */
 376         len = 0;
 377         while (uio->uio_resid) {
 378                 if ((error = ppb_1284_read(ppbus, ppi->ppi_mode,
 379                         ppi->ppi_buffer, min(BUFSIZE, uio->uio_resid),
 380                         &len))) {
 381                         goto error;
 382                 }
 383
 384                 if (!len)
 385                         goto error;             /* no more data */
 386
 387 #ifdef DEBUG_1284
 388                 printf("d");
 389 #endif
 390                 if ((error = uiomove(ppi->ppi_buffer, len, uio)))
 391                         goto error;
 392         }
 393
 394 error:
 395
 396 #else /* PERIPH_1284 */
 397         int error = ENODEV;
 398 #endif
 399
 400         return (error);
 401 }
 402
 403 /*
 404  * ppiwrite()
 405  *
 406  * IEEE1284 compliant write
 407  *
 408  * Actually, this is the peripheral side of a remote IEEE1284 read
 409  *
 410  * The first part of the negotiation (IEEE1284 device detection) is
 411  * done at interrupt level, then the remaining is done by the writing
 412  * process
 413  *
 414  * Once negotiation done, transfer data
 415  */
 416 static int
 417 ppiwrite(struct cdev *dev, struct uio *uio, int ioflag)
 418 {
 419 #ifdef PERIPH_1284
 420         u_int unit = minor(dev);
 421         struct ppi_data *ppi = UNITOSOFTC(unit);
 422         device_t ppidev = UNITODEVICE(unit);
 423         device_t ppbus = device_get_parent(ppidev);
 424         int len, error = 0, sent;
 425
 426 #if 0
 427         int ret;
 428
 429         #define ADDRESS         MS_PARAM(0, 0, MS_TYP_PTR)
 430         #define LENGTH          MS_PARAM(0, 1, MS_TYP_INT)
 431
 432         struct ppb_microseq msq[] = {
 433                   { MS_OP_PUT, { MS_UNKNOWN, MS_UNKNOWN, MS_UNKNOWN } },
 434                   MS_RET(0)
 435         };
 436
 437         /* negotiate ECP mode */
 438         if (ppb_1284_negociate(ppbus, PPB_ECP, 0)) {
 439                 printf("ppiwrite: ECP negotiation failed\n");
 440         }
 441
 442         while (!error && (len = min(uio->uio_resid, BUFSIZE))) {
 443                 uiomove(ppi->ppi_buffer, len, uio);
 444
 445                 ppb_MS_init_msq(msq, 2, ADDRESS, ppi->ppi_buffer, LENGTH, len);
 446
 447                 error = ppb_MS_microseq(ppbus, msq, &ret);
 448         }
 449 #endif
 450
 451         /* we have to be peripheral to be able to send data, so
 452          * wait for the appropriate state
 453          */
 454         if (ppb_1284_get_state(ppbus) < PPB_PERIPHERAL_NEGOCIATION)
 455                 ppb_1284_terminate(ppbus);
 456
 457         while (ppb_1284_get_state(ppbus) != PPB_PERIPHERAL_IDLE) {
 458                 /* XXX should check a variable before sleeping */
 459 #ifdef DEBUG_1284
 460                 printf("s");
 461 #endif
 462
 463                 ppi_enable_intr(ppidev);
 464
 465                 /* sleep until IEEE1284 negotiation starts */
 466                 error = tsleep(ppi, PCATCH | PPBPRI, "ppiwrite", 0);
 467
 468                 switch (error) {
 469                 case 0:
 470                         /* negotiate peripheral side with BYTE mode */
 471                         ppb_peripheral_negociate(ppbus, PPB_BYTE, 0);
 472                         break;
 473                 case EWOULDBLOCK:
 474                         break;
 475                 default:
 476                         goto error;
 477                 }
 478         }
 479 #ifdef DEBUG_1284
 480         printf("N");
 481 #endif
 482
 483         /* negotiation done, write bytes to master host */
 484         while ((len = min(uio->uio_resid, BUFSIZE)) != 0) {
 485                 uiomove(ppi->ppi_buffer, len, uio);
 486                 if ((error = byte_peripheral_write(ppbus,
 487                                                 ppi->ppi_buffer, len, &sent)))
 488                         goto error;
 489 #ifdef DEBUG_1284
 490                 printf("d");
 491 #endif
 492         }
 493
 494 error:
 495
 496 #else /* PERIPH_1284 */
 497         int error = ENODEV;
 498 #endif
 499
 500         return (error);
 501 }
 502
 503 static int
 504 ppiioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags, struct thread *td)
 505 {
 506         u_int unit = minor(dev);
 507         device_t ppidev = UNITODEVICE(unit);
 508         device_t ppbus = device_get_parent(ppidev);
 509         int error = 0;
 510         u_int8_t *val = (u_int8_t *)data;
 511
 512         switch (cmd) {
 513
 514         case PPIGDATA:                  /* get data register */
 515                 *val = ppb_rdtr(ppbus);
 516                 break;
 517         case PPIGSTATUS:                /* get status bits */
 518                 *val = ppb_rstr(ppbus);
 519                 break;
 520         case PPIGCTRL:                  /* get control bits */
 521                 *val = ppb_rctr(ppbus);
 522                 break;
 523         case PPIGEPPD:                  /* get EPP data bits */
 524                 *val = ppb_repp_D(ppbus);
 525                 break;
 526         case PPIGECR:                   /* get ECP bits */
 527                 *val = ppb_recr(ppbus);
 528                 break;
 529         case PPIGFIFO:                  /* read FIFO */
 530                 *val = ppb_rfifo(ppbus);
 531                 break;
 532         case PPISDATA:                  /* set data register */
 533                 ppb_wdtr(ppbus, *val);
 534                 break;
 535         case PPISSTATUS:                /* set status bits */
 536                 ppb_wstr(ppbus, *val);
 537                 break;
 538         case PPISCTRL:                  /* set control bits */
 539                 ppb_wctr(ppbus, *val);
 540                 break;
 541         case PPISEPPD:                  /* set EPP data bits */
 542                 ppb_wepp_D(ppbus, *val);
 543                 break;
 544         case PPISECR:                   /* set ECP bits */
 545                 ppb_wecr(ppbus, *val);
 546                 break;
 547         case PPISFIFO:                  /* write FIFO */
 548                 ppb_wfifo(ppbus, *val);
 549                 break;
 550         case PPIGEPPA:                  /* get EPP address bits */
 551                 *val = ppb_repp_A(ppbus);
 552                 break;
 553         case PPISEPPA:                  /* set EPP address bits */
 554                 ppb_wepp_A(ppbus, *val);
 555                 break;
 556         default:
 557                 error = ENOTTY;
 558                 break;
 559         }
 560
 561         return (error);
 562 }
 563
 564 static device_method_t ppi_methods[] = {
 565         /* device interface */
 566         DEVMETHOD(device_identify,      ppi_identify),
 567         DEVMETHOD(device_probe,         ppi_probe),
 568         DEVMETHOD(device_attach,        ppi_attach),
 569
 570         { 0, 0 }
 571 };
 572
 573 static driver_t ppi_driver = {
 574         "ppi",
 575         ppi_methods,
 576         sizeof(struct ppi_data),
 577 };
 578 DRIVER_MODULE(ppi, ppbus, ppi_driver, ppi_devclass, 0, 0);
 579 MODULE_DEPEND(ppi, ppbus, 1, 1, 1);