1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 1997, 1998, 1999 Nicolas Souchu, Michael Smith 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 #include "opt_ppb_1284.h" 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/module.h> 38 #include <sys/bus.h> 39 #include <sys/conf.h> 40 #include <sys/kernel.h> 41 #include <sys/lock.h> 42 #include <sys/sx.h> 43 #include <sys/uio.h> 44 #include <sys/fcntl.h> 45 46 #include <machine/bus.h> 47 #include <machine/resource.h> 48 #include <sys/rman.h> 49 50 #include <dev/ppbus/ppbconf.h> 51 #include <dev/ppbus/ppb_msq.h> 52 53 #ifdef PERIPH_1284 54 #include <sys/malloc.h> 55 #include <dev/ppbus/ppb_1284.h> 56 #endif 57 58 #include <dev/ppbus/ppi.h> 59 60 #include "ppbus_if.h" 61 62 #include <dev/ppbus/ppbio.h> 63 64 #define BUFSIZE 512 65 66 struct ppi_data { 67 device_t ppi_device; 68 struct cdev *ppi_cdev; 69 struct sx ppi_lock; 70 int ppi_flags; 71 #define HAVE_PPBUS (1<<0) 72 73 int ppi_mode; /* IEEE1284 mode */ 74 char ppi_buffer[BUFSIZE]; 75 76 #ifdef PERIPH_1284 77 struct resource *intr_resource; /* interrupt resource */ 78 void *intr_cookie; /* interrupt registration cookie */ 79 #endif /* PERIPH_1284 */ 80 }; 81 82 #define DEVTOSOFTC(dev) \ 83 ((struct ppi_data *)device_get_softc(dev)) 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 /* probe is always ok */ 151 device_set_desc(dev, "Parallel I/O"); 152 153 return (0); 154 } 155 156 /* 157 * ppi_attach() 158 */ 159 static int 160 ppi_attach(device_t dev) 161 { 162 struct ppi_data *ppi = DEVTOSOFTC(dev); 163 #ifdef PERIPH_1284 164 int error, rid = 0; 165 166 /* declare our interrupt handler */ 167 ppi->intr_resource = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, 168 RF_ACTIVE); 169 if (ppi->intr_resource) { 170 /* register our interrupt handler */ 171 error = bus_setup_intr(dev, ppi->intr_resource, 172 INTR_TYPE_TTY | INTR_MPSAFE, NULL, ppiintr, dev, 173 &ppi->intr_cookie); 174 if (error) { 175 bus_release_resource(dev, SYS_RES_IRQ, rid, 176 ppi->intr_resource); 177 device_printf(dev, 178 "Unable to register interrupt handler\n"); 179 return (error); 180 } 181 } 182 #endif /* PERIPH_1284 */ 183 184 sx_init(&ppi->ppi_lock, "ppi"); 185 ppi->ppi_cdev = make_dev(&ppi_cdevsw, device_get_unit(dev), 186 UID_ROOT, GID_WHEEL, 187 0600, "ppi%d", device_get_unit(dev)); 188 if (ppi->ppi_cdev == NULL) { 189 device_printf(dev, "Failed to create character device\n"); 190 return (ENXIO); 191 } 192 ppi->ppi_cdev->si_drv1 = ppi; 193 ppi->ppi_device = dev; 194 195 return (0); 196 } 197 198 static int 199 ppi_detach(device_t dev) 200 { 201 struct ppi_data *ppi = DEVTOSOFTC(dev); 202 203 destroy_dev(ppi->ppi_cdev); 204 #ifdef PERIPH_1284 205 if (ppi->intr_resource != NULL) { 206 bus_teardown_intr(dev, ppi->intr_resource, ppi->intr_cookie); 207 bus_release_resource(dev, SYS_RES_IRQ, 0, ppi->intr_resource); 208 } 209 #endif 210 sx_destroy(&ppi->ppi_lock); 211 return (0); 212 } 213 214 #ifdef PERIPH_1284 215 /* 216 * Cable 217 * ----- 218 * 219 * Use an IEEE1284 compliant (DB25/DB25) cable with the following tricks: 220 * 221 * nStrobe <-> nAck 1 <-> 10 222 * nAutofd <-> Busy 11 <-> 14 223 * nSelectin <-> Select 17 <-> 13 224 * nInit <-> nFault 15 <-> 16 225 * 226 */ 227 static void 228 ppiintr(void *arg) 229 { 230 device_t ppidev = (device_t)arg; 231 device_t ppbus = device_get_parent(ppidev); 232 struct ppi_data *ppi = DEVTOSOFTC(ppidev); 233 234 ppb_assert_locked(ppbus); 235 ppi_disable_intr(ppidev); 236 237 switch (ppb_1284_get_state(ppbus)) { 238 /* accept IEEE1284 negotiation then wakeup a waiting process to 239 * continue negotiation at process level */ 240 case PPB_FORWARD_IDLE: 241 /* Event 1 */ 242 if ((ppb_rstr(ppbus) & (SELECT | nBUSY)) == 243 (SELECT | nBUSY)) { 244 /* IEEE1284 negotiation */ 245 #ifdef DEBUG_1284 246 printf("N"); 247 #endif 248 249 /* Event 2 - prepare for reading the ext. value */ 250 ppb_wctr(ppbus, (PCD | STROBE | nINIT) & ~SELECTIN); 251 252 ppb_1284_set_state(ppbus, PPB_NEGOCIATION); 253 254 } else { 255 #ifdef DEBUG_1284 256 printf("0x%x", ppb_rstr(ppbus)); 257 #endif 258 ppb_peripheral_terminate(ppbus, PPB_DONTWAIT); 259 break; 260 } 261 262 /* wake up any process waiting for negotiation from 263 * remote master host */ 264 265 /* XXX should set a variable to warn the process about 266 * the interrupt */ 267 268 wakeup(ppi); 269 break; 270 default: 271 #ifdef DEBUG_1284 272 printf("?%d", ppb_1284_get_state(ppbus)); 273 #endif 274 ppb_1284_set_state(ppbus, PPB_FORWARD_IDLE); 275 ppb_set_mode(ppbus, PPB_COMPATIBLE); 276 break; 277 } 278 279 ppi_enable_intr(ppidev); 280 281 return; 282 } 283 #endif /* PERIPH_1284 */ 284 285 static int 286 ppiopen(struct cdev *dev, int flags, int fmt, struct thread *td) 287 { 288 struct ppi_data *ppi = dev->si_drv1; 289 device_t ppidev = ppi->ppi_device; 290 device_t ppbus = device_get_parent(ppidev); 291 int res; 292 293 sx_xlock(&ppi->ppi_lock); 294 if (!(ppi->ppi_flags & HAVE_PPBUS)) { 295 ppb_lock(ppbus); 296 res = ppb_request_bus(ppbus, ppidev, 297 (flags & O_NONBLOCK) ? PPB_DONTWAIT : PPB_WAIT | PPB_INTR); 298 ppb_unlock(ppbus); 299 if (res) { 300 sx_xunlock(&ppi->ppi_lock); 301 return (res); 302 } 303 304 ppi->ppi_flags |= HAVE_PPBUS; 305 } 306 sx_xunlock(&ppi->ppi_lock); 307 308 return (0); 309 } 310 311 static int 312 ppiclose(struct cdev *dev, int flags, int fmt, struct thread *td) 313 { 314 struct ppi_data *ppi = dev->si_drv1; 315 device_t ppidev = ppi->ppi_device; 316 device_t ppbus = device_get_parent(ppidev); 317 318 sx_xlock(&ppi->ppi_lock); 319 ppb_lock(ppbus); 320 #ifdef PERIPH_1284 321 switch (ppb_1284_get_state(ppbus)) { 322 case PPB_PERIPHERAL_IDLE: 323 ppb_peripheral_terminate(ppbus, 0); 324 break; 325 case PPB_REVERSE_IDLE: 326 case PPB_EPP_IDLE: 327 case PPB_ECP_FORWARD_IDLE: 328 default: 329 ppb_1284_terminate(ppbus); 330 break; 331 } 332 #endif /* PERIPH_1284 */ 333 334 /* unregistration of interrupt forced by release */ 335 ppb_release_bus(ppbus, ppidev); 336 ppb_unlock(ppbus); 337 338 ppi->ppi_flags &= ~HAVE_PPBUS; 339 sx_xunlock(&ppi->ppi_lock); 340 341 return (0); 342 } 343 344 /* 345 * ppiread() 346 * 347 * IEEE1284 compliant read. 348 * 349 * First, try negotiation to BYTE then NIBBLE mode 350 * If no data is available, wait for it otherwise transfer as much as possible 351 */ 352 static int 353 ppiread(struct cdev *dev, struct uio *uio, int ioflag) 354 { 355 #ifdef PERIPH_1284 356 struct ppi_data *ppi = dev->si_drv1; 357 device_t ppidev = ppi->ppi_device; 358 device_t ppbus = device_get_parent(ppidev); 359 int len, error = 0; 360 char *buffer; 361 362 buffer = malloc(BUFSIZE, M_DEVBUF, M_WAITOK); 363 364 ppb_lock(ppbus); 365 switch (ppb_1284_get_state(ppbus)) { 366 case PPB_PERIPHERAL_IDLE: 367 ppb_peripheral_terminate(ppbus, 0); 368 /* FALLTHROUGH */ 369 370 case PPB_FORWARD_IDLE: 371 /* if can't negotiate NIBBLE mode then try BYTE mode, 372 * the peripheral may be a computer 373 */ 374 if ((ppb_1284_negociate(ppbus, 375 ppi->ppi_mode = PPB_NIBBLE, 0))) { 376 /* XXX Wait 2 seconds to let the remote host some 377 * time to terminate its interrupt 378 */ 379 ppb_sleep(ppbus, ppi, PPBPRI, "ppiread", 2 * hz); 380 381 if ((error = ppb_1284_negociate(ppbus, 382 ppi->ppi_mode = PPB_BYTE, 0))) { 383 ppb_unlock(ppbus); 384 free(buffer, M_DEVBUF); 385 return (error); 386 } 387 } 388 break; 389 390 case PPB_REVERSE_IDLE: 391 case PPB_EPP_IDLE: 392 case PPB_ECP_FORWARD_IDLE: 393 default: 394 break; 395 } 396 397 #ifdef DEBUG_1284 398 printf("N"); 399 #endif 400 /* read data */ 401 len = 0; 402 while (uio->uio_resid) { 403 error = ppb_1284_read(ppbus, ppi->ppi_mode, 404 buffer, min(BUFSIZE, uio->uio_resid), &len); 405 ppb_unlock(ppbus); 406 if (error) 407 goto error; 408 409 if (!len) 410 goto error; /* no more data */ 411 412 #ifdef DEBUG_1284 413 printf("d"); 414 #endif 415 if ((error = uiomove(buffer, len, uio))) 416 goto error; 417 ppb_lock(ppbus); 418 } 419 ppb_unlock(ppbus); 420 421 error: 422 free(buffer, M_DEVBUF); 423 #else /* PERIPH_1284 */ 424 int error = ENODEV; 425 #endif 426 427 return (error); 428 } 429 430 /* 431 * ppiwrite() 432 * 433 * IEEE1284 compliant write 434 * 435 * Actually, this is the peripheral side of a remote IEEE1284 read 436 * 437 * The first part of the negotiation (IEEE1284 device detection) is 438 * done at interrupt level, then the remaining is done by the writing 439 * process 440 * 441 * Once negotiation done, transfer data 442 */ 443 static int 444 ppiwrite(struct cdev *dev, struct uio *uio, int ioflag) 445 { 446 #ifdef PERIPH_1284 447 struct ppi_data *ppi = dev->si_drv1; 448 device_t ppidev = ppi->ppi_device; 449 device_t ppbus = device_get_parent(ppidev); 450 int len, error = 0, sent; 451 char *buffer; 452 453 #if 0 454 int ret; 455 456 #define ADDRESS MS_PARAM(0, 0, MS_TYP_PTR) 457 #define LENGTH MS_PARAM(0, 1, MS_TYP_INT) 458 459 struct ppb_microseq msq[] = { 460 { MS_OP_PUT, { MS_UNKNOWN, MS_UNKNOWN, MS_UNKNOWN } }, 461 MS_RET(0) 462 }; 463 464 buffer = malloc(BUFSIZE, M_DEVBUF, M_WAITOK); 465 ppb_lock(ppbus); 466 467 /* negotiate ECP mode */ 468 if (ppb_1284_negociate(ppbus, PPB_ECP, 0)) { 469 printf("ppiwrite: ECP negotiation failed\n"); 470 } 471 472 while (!error && (len = min(uio->uio_resid, BUFSIZE))) { 473 ppb_unlock(ppbus); 474 uiomove(buffer, len, uio); 475 476 ppb_MS_init_msq(msq, 2, ADDRESS, buffer, LENGTH, len); 477 478 ppb_lock(ppbus); 479 error = ppb_MS_microseq(ppbus, msq, &ret); 480 } 481 #else 482 buffer = malloc(BUFSIZE, M_DEVBUF, M_WAITOK); 483 ppb_lock(ppbus); 484 #endif 485 486 /* we have to be peripheral to be able to send data, so 487 * wait for the appropriate state 488 */ 489 if (ppb_1284_get_state(ppbus) < PPB_PERIPHERAL_NEGOCIATION) 490 ppb_1284_terminate(ppbus); 491 492 while (ppb_1284_get_state(ppbus) != PPB_PERIPHERAL_IDLE) { 493 /* XXX should check a variable before sleeping */ 494 #ifdef DEBUG_1284 495 printf("s"); 496 #endif 497 498 ppi_enable_intr(ppidev); 499 500 /* sleep until IEEE1284 negotiation starts */ 501 error = ppb_sleep(ppbus, ppi, PCATCH | PPBPRI, "ppiwrite", 0); 502 503 switch (error) { 504 case 0: 505 /* negotiate peripheral side with BYTE mode */ 506 ppb_peripheral_negociate(ppbus, PPB_BYTE, 0); 507 break; 508 case EWOULDBLOCK: 509 break; 510 default: 511 goto error; 512 } 513 } 514 #ifdef DEBUG_1284 515 printf("N"); 516 #endif 517 518 /* negotiation done, write bytes to master host */ 519 while ((len = min(uio->uio_resid, BUFSIZE)) != 0) { 520 ppb_unlock(ppbus); 521 uiomove(buffer, len, uio); 522 ppb_lock(ppbus); 523 if ((error = byte_peripheral_write(ppbus, 524 buffer, len, &sent))) 525 goto error; 526 #ifdef DEBUG_1284 527 printf("d"); 528 #endif 529 } 530 531 error: 532 ppb_unlock(ppbus); 533 free(buffer, M_DEVBUF); 534 #else /* PERIPH_1284 */ 535 int error = ENODEV; 536 #endif 537 538 return (error); 539 } 540 541 static int 542 ppiioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags, struct thread *td) 543 { 544 struct ppi_data *ppi = dev->si_drv1; 545 device_t ppidev = ppi->ppi_device; 546 device_t ppbus = device_get_parent(ppidev); 547 int error = 0; 548 u_int8_t *val = (u_int8_t *)data; 549 550 ppb_lock(ppbus); 551 switch (cmd) { 552 case PPIGDATA: /* get data register */ 553 *val = ppb_rdtr(ppbus); 554 break; 555 case PPIGSTATUS: /* get status bits */ 556 *val = ppb_rstr(ppbus); 557 break; 558 case PPIGCTRL: /* get control bits */ 559 *val = ppb_rctr(ppbus); 560 break; 561 case PPIGEPPD: /* get EPP data bits */ 562 *val = ppb_repp_D(ppbus); 563 break; 564 case PPIGECR: /* get ECP bits */ 565 *val = ppb_recr(ppbus); 566 break; 567 case PPIGFIFO: /* read FIFO */ 568 *val = ppb_rfifo(ppbus); 569 break; 570 case PPISDATA: /* set data register */ 571 ppb_wdtr(ppbus, *val); 572 break; 573 case PPISSTATUS: /* set status bits */ 574 ppb_wstr(ppbus, *val); 575 break; 576 case PPISCTRL: /* set control bits */ 577 ppb_wctr(ppbus, *val); 578 break; 579 case PPISEPPD: /* set EPP data bits */ 580 ppb_wepp_D(ppbus, *val); 581 break; 582 case PPISECR: /* set ECP bits */ 583 ppb_wecr(ppbus, *val); 584 break; 585 case PPISFIFO: /* write FIFO */ 586 ppb_wfifo(ppbus, *val); 587 break; 588 case PPIGEPPA: /* get EPP address bits */ 589 *val = ppb_repp_A(ppbus); 590 break; 591 case PPISEPPA: /* set EPP address bits */ 592 ppb_wepp_A(ppbus, *val); 593 break; 594 default: 595 error = ENOTTY; 596 break; 597 } 598 ppb_unlock(ppbus); 599 600 return (error); 601 } 602 603 static device_method_t ppi_methods[] = { 604 /* device interface */ 605 DEVMETHOD(device_identify, ppi_identify), 606 DEVMETHOD(device_probe, ppi_probe), 607 DEVMETHOD(device_attach, ppi_attach), 608 DEVMETHOD(device_detach, ppi_detach), 609 { 0, 0 } 610 }; 611 612 static driver_t ppi_driver = { 613 "ppi", 614 ppi_methods, 615 sizeof(struct ppi_data), 616 }; 617 618 DRIVER_MODULE(ppi, ppbus, ppi_driver, 0, 0); 619 MODULE_DEPEND(ppi, ppbus, 1, 1, 1); 620