Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/dev/ppbus/ppi.c
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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/lock.h> 40 #include <sys/sx.h> 41 #include <sys/uio.h> 42 #include <sys/fcntl.h> 43 44 #include <machine/bus.h> 45 #include <machine/resource.h> 46 #include <sys/rman.h> 47 48 #include <dev/ppbus/ppbconf.h> 49 #include <dev/ppbus/ppb_msq.h> 50 51 #ifdef PERIPH_1284 52 #include <sys/malloc.h> 53 #include <dev/ppbus/ppb_1284.h> 54 #endif 55 56 #include <dev/ppbus/ppi.h> 57 58 #include "ppbus_if.h" 59 60 #include <dev/ppbus/ppbio.h> 61 62 #define BUFSIZE 512 63 64 struct ppi_data { 65 device_t ppi_device; 66 struct cdev *ppi_cdev; 67 struct sx ppi_lock; 68 int ppi_flags; 69 #define HAVE_PPBUS (1<<0) 70 71 int ppi_mode; /* IEEE1284 mode */ 72 char ppi_buffer[BUFSIZE]; 73 74 #ifdef PERIPH_1284 75 struct resource *intr_resource; /* interrupt resource */ 76 void *intr_cookie; /* interrupt registration cookie */ 77 #endif /* PERIPH_1284 */ 78 }; 79 80 #define DEVTOSOFTC(dev) \ 81 ((struct ppi_data *)device_get_softc(dev)) 82 83 static devclass_t ppi_devclass; 84 85 #ifdef PERIPH_1284 86 static void ppiintr(void *arg); 87 #endif 88 89 static d_open_t ppiopen; 90 static d_close_t ppiclose; 91 static d_ioctl_t ppiioctl; 92 static d_write_t ppiwrite; 93 static d_read_t ppiread; 94 95 static struct cdevsw ppi_cdevsw = { 96 .d_version = D_VERSION, 97 .d_open = ppiopen, 98 .d_close = ppiclose, 99 .d_read = ppiread, 100 .d_write = ppiwrite, 101 .d_ioctl = ppiioctl, 102 .d_name = "ppi", 103 }; 104 105 #ifdef PERIPH_1284 106 107 static void 108 ppi_enable_intr(device_t ppidev) 109 { 110 char r; 111 device_t ppbus = device_get_parent(ppidev); 112 113 r = ppb_rctr(ppbus); 114 ppb_wctr(ppbus, r | IRQENABLE); 115 116 return; 117 } 118 119 static void 120 ppi_disable_intr(device_t ppidev) 121 { 122 char r; 123 device_t ppbus = device_get_parent(ppidev); 124 125 r = ppb_rctr(ppbus); 126 ppb_wctr(ppbus, r & ~IRQENABLE); 127 128 return; 129 } 130 131 #endif /* PERIPH_1284 */ 132 133 static void 134 ppi_identify(driver_t *driver, device_t parent) 135 { 136 137 device_t dev; 138 139 dev = device_find_child(parent, "ppi", -1); 140 if (!dev) 141 BUS_ADD_CHILD(parent, 0, "ppi", -1); 142 } 143 144 /* 145 * ppi_probe() 146 */ 147 static int 148 ppi_probe(device_t dev) 149 { 150 struct ppi_data *ppi; 151 152 /* probe is always ok */ 153 device_set_desc(dev, "Parallel I/O"); 154 155 ppi = DEVTOSOFTC(dev); 156 157 return (0); 158 } 159 160 /* 161 * ppi_attach() 162 */ 163 static int 164 ppi_attach(device_t dev) 165 { 166 struct ppi_data *ppi = DEVTOSOFTC(dev); 167 #ifdef PERIPH_1284 168 int error, rid = 0; 169 170 /* declare our interrupt handler */ 171 ppi->intr_resource = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, 172 RF_ACTIVE); 173 if (ppi->intr_resource) { 174 /* register our interrupt handler */ 175 error = bus_setup_intr(dev, ppi->intr_resource, 176 INTR_TYPE_TTY | INTR_MPSAFE, NULL, ppiintr, dev, 177 &ppi->intr_cookie); 178 if (error) { 179 bus_release_resource(dev, SYS_RES_IRQ, rid, 180 ppi->intr_resource); 181 device_printf(dev, 182 "Unable to register interrupt handler\n"); 183 return (error); 184 } 185 } 186 #endif /* PERIPH_1284 */ 187 188 sx_init(&ppi->ppi_lock, "ppi"); 189 ppi->ppi_cdev = make_dev(&ppi_cdevsw, device_get_unit(dev), 190 UID_ROOT, GID_WHEEL, 191 0600, "ppi%d", device_get_unit(dev)); 192 if (ppi->ppi_cdev == NULL) { 193 device_printf(dev, "Failed to create character device\n"); 194 return (ENXIO); 195 } 196 ppi->ppi_cdev->si_drv1 = ppi; 197 ppi->ppi_device = dev; 198 199 return (0); 200 } 201 202 static int 203 ppi_detach(device_t dev) 204 { 205 struct ppi_data *ppi = DEVTOSOFTC(dev); 206 207 destroy_dev(ppi->ppi_cdev); 208 #ifdef PERIPH_1284 209 if (ppi->intr_resource != NULL) { 210 bus_teardown_intr(dev, ppi->intr_resource, ppi->intr_cookie); 211 bus_release_resource(dev, SYS_RES_IRQ, 0, ppi->intr_resource); 212 } 213 #endif 214 sx_destroy(&ppi->ppi_lock); 215 return (0); 216 } 217 218 #ifdef PERIPH_1284 219 /* 220 * Cable 221 * ----- 222 * 223 * Use an IEEE1284 compliant (DB25/DB25) cable with the following tricks: 224 * 225 * nStrobe <-> nAck 1 <-> 10 226 * nAutofd <-> Busy 11 <-> 14 227 * nSelectin <-> Select 17 <-> 13 228 * nInit <-> nFault 15 <-> 16 229 * 230 */ 231 static void 232 ppiintr(void *arg) 233 { 234 device_t ppidev = (device_t)arg; 235 device_t ppbus = device_get_parent(ppidev); 236 struct ppi_data *ppi = DEVTOSOFTC(ppidev); 237 238 ppb_assert_locked(ppbus); 239 ppi_disable_intr(ppidev); 240 241 switch (ppb_1284_get_state(ppbus)) { 242 243 /* accept IEEE1284 negotiation then wakeup a waiting process to 244 * continue negotiation at process level */ 245 case PPB_FORWARD_IDLE: 246 /* Event 1 */ 247 if ((ppb_rstr(ppbus) & (SELECT | nBUSY)) == 248 (SELECT | nBUSY)) { 249 /* IEEE1284 negotiation */ 250 #ifdef DEBUG_1284 251 printf("N"); 252 #endif 253 254 /* Event 2 - prepare for reading the ext. value */ 255 ppb_wctr(ppbus, (PCD | STROBE | nINIT) & ~SELECTIN); 256 257 ppb_1284_set_state(ppbus, PPB_NEGOCIATION); 258 259 } else { 260 #ifdef DEBUG_1284 261 printf("0x%x", ppb_rstr(ppbus)); 262 #endif 263 ppb_peripheral_terminate(ppbus, PPB_DONTWAIT); 264 break; 265 } 266 267 /* wake up any process waiting for negotiation from 268 * remote master host */ 269 270 /* XXX should set a variable to warn the process about 271 * the interrupt */ 272 273 wakeup(ppi); 274 break; 275 default: 276 #ifdef DEBUG_1284 277 printf("?%d", ppb_1284_get_state(ppbus)); 278 #endif 279 ppb_1284_set_state(ppbus, PPB_FORWARD_IDLE); 280 ppb_set_mode(ppbus, PPB_COMPATIBLE); 281 break; 282 } 283 284 ppi_enable_intr(ppidev); 285 286 return; 287 } 288 #endif /* PERIPH_1284 */ 289 290 static int 291 ppiopen(struct cdev *dev, int flags, int fmt, struct thread *td) 292 { 293 struct ppi_data *ppi = dev->si_drv1; 294 device_t ppidev = ppi->ppi_device; 295 device_t ppbus = device_get_parent(ppidev); 296 int res; 297 298 sx_xlock(&ppi->ppi_lock); 299 if (!(ppi->ppi_flags & HAVE_PPBUS)) { 300 ppb_lock(ppbus); 301 res = ppb_request_bus(ppbus, ppidev, 302 (flags & O_NONBLOCK) ? PPB_DONTWAIT : PPB_WAIT | PPB_INTR); 303 ppb_unlock(ppbus); 304 if (res) { 305 sx_xunlock(&ppi->ppi_lock); 306 return (res); 307 } 308 309 ppi->ppi_flags |= HAVE_PPBUS; 310 } 311 sx_xunlock(&ppi->ppi_lock); 312 313 return (0); 314 } 315 316 static int 317 ppiclose(struct cdev *dev, int flags, int fmt, struct thread *td) 318 { 319 struct ppi_data *ppi = dev->si_drv1; 320 device_t ppidev = ppi->ppi_device; 321 device_t ppbus = device_get_parent(ppidev); 322 323 sx_xlock(&ppi->ppi_lock); 324 ppb_lock(ppbus); 325 #ifdef PERIPH_1284 326 switch (ppb_1284_get_state(ppbus)) { 327 case PPB_PERIPHERAL_IDLE: 328 ppb_peripheral_terminate(ppbus, 0); 329 break; 330 case PPB_REVERSE_IDLE: 331 case PPB_EPP_IDLE: 332 case PPB_ECP_FORWARD_IDLE: 333 default: 334 ppb_1284_terminate(ppbus); 335 break; 336 } 337 #endif /* PERIPH_1284 */ 338 339 /* unregistration of interrupt forced by release */ 340 ppb_release_bus(ppbus, ppidev); 341 ppb_unlock(ppbus); 342 343 ppi->ppi_flags &= ~HAVE_PPBUS; 344 sx_xunlock(&ppi->ppi_lock); 345 346 return (0); 347 } 348 349 /* 350 * ppiread() 351 * 352 * IEEE1284 compliant read. 353 * 354 * First, try negotiation to BYTE then NIBBLE mode 355 * If no data is available, wait for it otherwise transfer as much as possible 356 */ 357 static int 358 ppiread(struct cdev *dev, struct uio *uio, int ioflag) 359 { 360 #ifdef PERIPH_1284 361 struct ppi_data *ppi = dev->si_drv1; 362 device_t ppidev = ppi->ppi_device; 363 device_t ppbus = device_get_parent(ppidev); 364 int len, error = 0; 365 char *buffer; 366 367 buffer = malloc(BUFSIZE, M_DEVBUF, M_WAITOK); 368 369 ppb_lock(ppbus); 370 switch (ppb_1284_get_state(ppbus)) { 371 case PPB_PERIPHERAL_IDLE: 372 ppb_peripheral_terminate(ppbus, 0); 373 /* FALLTHROUGH */ 374 375 case PPB_FORWARD_IDLE: 376 /* if can't negotiate NIBBLE mode then try BYTE mode, 377 * the peripheral may be a computer 378 */ 379 if ((ppb_1284_negociate(ppbus, 380 ppi->ppi_mode = PPB_NIBBLE, 0))) { 381 382 /* XXX Wait 2 seconds to let the remote host some 383 * time to terminate its interrupt 384 */ 385 ppb_sleep(ppbus, ppi, PPBPRI, "ppiread", 2 * hz); 386 387 if ((error = ppb_1284_negociate(ppbus, 388 ppi->ppi_mode = PPB_BYTE, 0))) { 389 ppb_unlock(ppbus); 390 free(buffer, M_DEVBUF); 391 return (error); 392 } 393 } 394 break; 395 396 case PPB_REVERSE_IDLE: 397 case PPB_EPP_IDLE: 398 case PPB_ECP_FORWARD_IDLE: 399 default: 400 break; 401 } 402 403 #ifdef DEBUG_1284 404 printf("N"); 405 #endif 406 /* read data */ 407 len = 0; 408 while (uio->uio_resid) { 409 error = ppb_1284_read(ppbus, ppi->ppi_mode, 410 buffer, min(BUFSIZE, uio->uio_resid), &len); 411 ppb_unlock(ppbus); 412 if (error) 413 goto error; 414 415 if (!len) 416 goto error; /* no more data */ 417 418 #ifdef DEBUG_1284 419 printf("d"); 420 #endif 421 if ((error = uiomove(buffer, len, uio))) 422 goto error; 423 ppb_lock(ppbus); 424 } 425 ppb_unlock(ppbus); 426 427 error: 428 free(buffer, M_DEVBUF); 429 #else /* PERIPH_1284 */ 430 int error = ENODEV; 431 #endif 432 433 return (error); 434 } 435 436 /* 437 * ppiwrite() 438 * 439 * IEEE1284 compliant write 440 * 441 * Actually, this is the peripheral side of a remote IEEE1284 read 442 * 443 * The first part of the negotiation (IEEE1284 device detection) is 444 * done at interrupt level, then the remaining is done by the writing 445 * process 446 * 447 * Once negotiation done, transfer data 448 */ 449 static int 450 ppiwrite(struct cdev *dev, struct uio *uio, int ioflag) 451 { 452 #ifdef PERIPH_1284 453 struct ppi_data *ppi = dev->si_drv1; 454 device_t ppidev = ppi->ppi_device; 455 device_t ppbus = device_get_parent(ppidev); 456 int len, error = 0, sent; 457 char *buffer; 458 459 #if 0 460 int ret; 461 462 #define ADDRESS MS_PARAM(0, 0, MS_TYP_PTR) 463 #define LENGTH MS_PARAM(0, 1, MS_TYP_INT) 464 465 struct ppb_microseq msq[] = { 466 { MS_OP_PUT, { MS_UNKNOWN, MS_UNKNOWN, MS_UNKNOWN } }, 467 MS_RET(0) 468 }; 469 470 buffer = malloc(BUFSIZE, M_DEVBUF, M_WAITOK); 471 ppb_lock(ppbus); 472 473 /* negotiate ECP mode */ 474 if (ppb_1284_negociate(ppbus, PPB_ECP, 0)) { 475 printf("ppiwrite: ECP negotiation failed\n"); 476 } 477 478 while (!error && (len = min(uio->uio_resid, BUFSIZE))) { 479 ppb_unlock(ppbus); 480 uiomove(buffer, len, uio); 481 482 ppb_MS_init_msq(msq, 2, ADDRESS, buffer, LENGTH, len); 483 484 ppb_lock(ppbus); 485 error = ppb_MS_microseq(ppbus, msq, &ret); 486 } 487 #else 488 buffer = malloc(BUFSIZE, M_DEVBUF, M_WAITOK); 489 ppb_lock(ppbus); 490 #endif 491 492 /* we have to be peripheral to be able to send data, so 493 * wait for the appropriate state 494 */ 495 if (ppb_1284_get_state(ppbus) < PPB_PERIPHERAL_NEGOCIATION) 496 ppb_1284_terminate(ppbus); 497 498 while (ppb_1284_get_state(ppbus) != PPB_PERIPHERAL_IDLE) { 499 /* XXX should check a variable before sleeping */ 500 #ifdef DEBUG_1284 501 printf("s"); 502 #endif 503 504 ppi_enable_intr(ppidev); 505 506 /* sleep until IEEE1284 negotiation starts */ 507 error = ppb_sleep(ppbus, ppi, PCATCH | PPBPRI, "ppiwrite", 0); 508 509 switch (error) { 510 case 0: 511 /* negotiate peripheral side with BYTE mode */ 512 ppb_peripheral_negociate(ppbus, PPB_BYTE, 0); 513 break; 514 case EWOULDBLOCK: 515 break; 516 default: 517 goto error; 518 } 519 } 520 #ifdef DEBUG_1284 521 printf("N"); 522 #endif 523 524 /* negotiation done, write bytes to master host */ 525 while ((len = min(uio->uio_resid, BUFSIZE)) != 0) { 526 ppb_unlock(ppbus); 527 uiomove(buffer, len, uio); 528 ppb_lock(ppbus); 529 if ((error = byte_peripheral_write(ppbus, 530 buffer, len, &sent))) 531 goto error; 532 #ifdef DEBUG_1284 533 printf("d"); 534 #endif 535 } 536 537 error: 538 ppb_unlock(ppbus); 539 free(buffer, M_DEVBUF); 540 #else /* PERIPH_1284 */ 541 int error = ENODEV; 542 #endif 543 544 return (error); 545 } 546 547 static int 548 ppiioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags, struct thread *td) 549 { 550 struct ppi_data *ppi = dev->si_drv1; 551 device_t ppidev = ppi->ppi_device; 552 device_t ppbus = device_get_parent(ppidev); 553 int error = 0; 554 u_int8_t *val = (u_int8_t *)data; 555 556 ppb_lock(ppbus); 557 switch (cmd) { 558 559 case PPIGDATA: /* get data register */ 560 *val = ppb_rdtr(ppbus); 561 break; 562 case PPIGSTATUS: /* get status bits */ 563 *val = ppb_rstr(ppbus); 564 break; 565 case PPIGCTRL: /* get control bits */ 566 *val = ppb_rctr(ppbus); 567 break; 568 case PPIGEPPD: /* get EPP data bits */ 569 *val = ppb_repp_D(ppbus); 570 break; 571 case PPIGECR: /* get ECP bits */ 572 *val = ppb_recr(ppbus); 573 break; 574 case PPIGFIFO: /* read FIFO */ 575 *val = ppb_rfifo(ppbus); 576 break; 577 case PPISDATA: /* set data register */ 578 ppb_wdtr(ppbus, *val); 579 break; 580 case PPISSTATUS: /* set status bits */ 581 ppb_wstr(ppbus, *val); 582 break; 583 case PPISCTRL: /* set control bits */ 584 ppb_wctr(ppbus, *val); 585 break; 586 case PPISEPPD: /* set EPP data bits */ 587 ppb_wepp_D(ppbus, *val); 588 break; 589 case PPISECR: /* set ECP bits */ 590 ppb_wecr(ppbus, *val); 591 break; 592 case PPISFIFO: /* write FIFO */ 593 ppb_wfifo(ppbus, *val); 594 break; 595 case PPIGEPPA: /* get EPP address bits */ 596 *val = ppb_repp_A(ppbus); 597 break; 598 case PPISEPPA: /* set EPP address bits */ 599 ppb_wepp_A(ppbus, *val); 600 break; 601 default: 602 error = ENOTTY; 603 break; 604 } 605 ppb_unlock(ppbus); 606 607 return (error); 608 } 609 610 static device_method_t ppi_methods[] = { 611 /* device interface */ 612 DEVMETHOD(device_identify, ppi_identify), 613 DEVMETHOD(device_probe, ppi_probe), 614 DEVMETHOD(device_attach, ppi_attach), 615 DEVMETHOD(device_detach, ppi_detach), 616 617 { 0, 0 } 618 }; 619 620 static driver_t ppi_driver = { 621 "ppi", 622 ppi_methods, 623 sizeof(struct ppi_data), 624 }; 625 DRIVER_MODULE(ppi, ppbus, ppi_driver, ppi_devclass, 0, 0); 626 MODULE_DEPEND(ppi, ppbus, 1, 1, 1);
Cache object: a9440cb76ee98f36724f3d96dbb364a8
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