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 #include "opt_ppb_1284.h" 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/module.h> 37 #include <sys/bus.h> 38 #include <sys/conf.h> 39 #include <sys/kernel.h> 40 #include <sys/lock.h> 41 #include <sys/sx.h> 42 #include <sys/uio.h> 43 #include <sys/fcntl.h> 44 45 #include <machine/bus.h> 46 #include <machine/resource.h> 47 #include <sys/rman.h> 48 49 #include <dev/ppbus/ppbconf.h> 50 #include <dev/ppbus/ppb_msq.h> 51 52 #ifdef PERIPH_1284 53 #include <sys/malloc.h> 54 #include <dev/ppbus/ppb_1284.h> 55 #endif 56 57 #include <dev/ppbus/ppi.h> 58 59 #include "ppbus_if.h" 60 61 #include <dev/ppbus/ppbio.h> 62 63 #define BUFSIZE 512 64 65 struct ppi_data { 66 device_t ppi_device; 67 struct cdev *ppi_cdev; 68 struct sx ppi_lock; 69 int ppi_flags; 70 #define HAVE_PPBUS (1<<0) 71 72 int ppi_mode; /* IEEE1284 mode */ 73 char ppi_buffer[BUFSIZE]; 74 75 #ifdef PERIPH_1284 76 struct resource *intr_resource; /* interrupt resource */ 77 void *intr_cookie; /* interrupt registration cookie */ 78 #endif /* PERIPH_1284 */ 79 }; 80 81 #define DEVTOSOFTC(dev) \ 82 ((struct ppi_data *)device_get_softc(dev)) 83 84 #ifdef PERIPH_1284 85 static void ppiintr(void *arg); 86 #endif 87 88 static d_open_t ppiopen; 89 static d_close_t ppiclose; 90 static d_ioctl_t ppiioctl; 91 static d_write_t ppiwrite; 92 static d_read_t ppiread; 93 94 static struct cdevsw ppi_cdevsw = { 95 .d_version = D_VERSION, 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 /* probe is always ok */ 150 device_set_desc(dev, "Parallel I/O"); 151 152 return (0); 153 } 154 155 /* 156 * ppi_attach() 157 */ 158 static int 159 ppi_attach(device_t dev) 160 { 161 struct ppi_data *ppi = DEVTOSOFTC(dev); 162 #ifdef PERIPH_1284 163 int error, rid = 0; 164 165 /* declare our interrupt handler */ 166 ppi->intr_resource = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, 167 RF_ACTIVE); 168 if (ppi->intr_resource) { 169 /* register our interrupt handler */ 170 error = bus_setup_intr(dev, ppi->intr_resource, 171 INTR_TYPE_TTY | INTR_MPSAFE, NULL, ppiintr, dev, 172 &ppi->intr_cookie); 173 if (error) { 174 bus_release_resource(dev, SYS_RES_IRQ, rid, 175 ppi->intr_resource); 176 device_printf(dev, 177 "Unable to register interrupt handler\n"); 178 return (error); 179 } 180 } 181 #endif /* PERIPH_1284 */ 182 183 sx_init(&ppi->ppi_lock, "ppi"); 184 ppi->ppi_cdev = make_dev(&ppi_cdevsw, device_get_unit(dev), 185 UID_ROOT, GID_WHEEL, 186 0600, "ppi%d", device_get_unit(dev)); 187 if (ppi->ppi_cdev == NULL) { 188 device_printf(dev, "Failed to create character device\n"); 189 return (ENXIO); 190 } 191 ppi->ppi_cdev->si_drv1 = ppi; 192 ppi->ppi_device = dev; 193 194 return (0); 195 } 196 197 static int 198 ppi_detach(device_t dev) 199 { 200 struct ppi_data *ppi = DEVTOSOFTC(dev); 201 202 destroy_dev(ppi->ppi_cdev); 203 #ifdef PERIPH_1284 204 if (ppi->intr_resource != NULL) { 205 bus_teardown_intr(dev, ppi->intr_resource, ppi->intr_cookie); 206 bus_release_resource(dev, SYS_RES_IRQ, 0, ppi->intr_resource); 207 } 208 #endif 209 sx_destroy(&ppi->ppi_lock); 210 return (0); 211 } 212 213 #ifdef PERIPH_1284 214 /* 215 * Cable 216 * ----- 217 * 218 * Use an IEEE1284 compliant (DB25/DB25) cable with the following tricks: 219 * 220 * nStrobe <-> nAck 1 <-> 10 221 * nAutofd <-> Busy 11 <-> 14 222 * nSelectin <-> Select 17 <-> 13 223 * nInit <-> nFault 15 <-> 16 224 * 225 */ 226 static void 227 ppiintr(void *arg) 228 { 229 device_t ppidev = (device_t)arg; 230 device_t ppbus = device_get_parent(ppidev); 231 struct ppi_data *ppi = DEVTOSOFTC(ppidev); 232 233 ppb_assert_locked(ppbus); 234 ppi_disable_intr(ppidev); 235 236 switch (ppb_1284_get_state(ppbus)) { 237 /* accept IEEE1284 negotiation then wakeup a waiting process to 238 * continue negotiation at process level */ 239 case PPB_FORWARD_IDLE: 240 /* Event 1 */ 241 if ((ppb_rstr(ppbus) & (SELECT | nBUSY)) == 242 (SELECT | nBUSY)) { 243 /* IEEE1284 negotiation */ 244 #ifdef DEBUG_1284 245 printf("N"); 246 #endif 247 248 /* Event 2 - prepare for reading the ext. value */ 249 ppb_wctr(ppbus, (PCD | STROBE | nINIT) & ~SELECTIN); 250 251 ppb_1284_set_state(ppbus, PPB_NEGOCIATION); 252 253 } else { 254 #ifdef DEBUG_1284 255 printf("0x%x", ppb_rstr(ppbus)); 256 #endif 257 ppb_peripheral_terminate(ppbus, PPB_DONTWAIT); 258 break; 259 } 260 261 /* wake up any process waiting for negotiation from 262 * remote master host */ 263 264 /* XXX should set a variable to warn the process about 265 * the interrupt */ 266 267 wakeup(ppi); 268 break; 269 default: 270 #ifdef DEBUG_1284 271 printf("?%d", ppb_1284_get_state(ppbus)); 272 #endif 273 ppb_1284_set_state(ppbus, PPB_FORWARD_IDLE); 274 ppb_set_mode(ppbus, PPB_COMPATIBLE); 275 break; 276 } 277 278 ppi_enable_intr(ppidev); 279 280 return; 281 } 282 #endif /* PERIPH_1284 */ 283 284 static int 285 ppiopen(struct cdev *dev, int flags, int fmt, struct thread *td) 286 { 287 struct ppi_data *ppi = dev->si_drv1; 288 device_t ppidev = ppi->ppi_device; 289 device_t ppbus = device_get_parent(ppidev); 290 int res; 291 292 sx_xlock(&ppi->ppi_lock); 293 if (!(ppi->ppi_flags & HAVE_PPBUS)) { 294 ppb_lock(ppbus); 295 res = ppb_request_bus(ppbus, ppidev, 296 (flags & O_NONBLOCK) ? PPB_DONTWAIT : PPB_WAIT | PPB_INTR); 297 ppb_unlock(ppbus); 298 if (res) { 299 sx_xunlock(&ppi->ppi_lock); 300 return (res); 301 } 302 303 ppi->ppi_flags |= HAVE_PPBUS; 304 } 305 sx_xunlock(&ppi->ppi_lock); 306 307 return (0); 308 } 309 310 static int 311 ppiclose(struct cdev *dev, int flags, int fmt, struct thread *td) 312 { 313 struct ppi_data *ppi = dev->si_drv1; 314 device_t ppidev = ppi->ppi_device; 315 device_t ppbus = device_get_parent(ppidev); 316 317 sx_xlock(&ppi->ppi_lock); 318 ppb_lock(ppbus); 319 #ifdef PERIPH_1284 320 switch (ppb_1284_get_state(ppbus)) { 321 case PPB_PERIPHERAL_IDLE: 322 ppb_peripheral_terminate(ppbus, 0); 323 break; 324 case PPB_REVERSE_IDLE: 325 case PPB_EPP_IDLE: 326 case PPB_ECP_FORWARD_IDLE: 327 default: 328 ppb_1284_terminate(ppbus); 329 break; 330 } 331 #endif /* PERIPH_1284 */ 332 333 /* unregistration of interrupt forced by release */ 334 ppb_release_bus(ppbus, ppidev); 335 ppb_unlock(ppbus); 336 337 ppi->ppi_flags &= ~HAVE_PPBUS; 338 sx_xunlock(&ppi->ppi_lock); 339 340 return (0); 341 } 342 343 /* 344 * ppiread() 345 * 346 * IEEE1284 compliant read. 347 * 348 * First, try negotiation to BYTE then NIBBLE mode 349 * If no data is available, wait for it otherwise transfer as much as possible 350 */ 351 static int 352 ppiread(struct cdev *dev, struct uio *uio, int ioflag) 353 { 354 #ifdef PERIPH_1284 355 struct ppi_data *ppi = dev->si_drv1; 356 device_t ppidev = ppi->ppi_device; 357 device_t ppbus = device_get_parent(ppidev); 358 int len, error = 0; 359 char *buffer; 360 361 buffer = malloc(BUFSIZE, M_DEVBUF, M_WAITOK); 362 363 ppb_lock(ppbus); 364 switch (ppb_1284_get_state(ppbus)) { 365 case PPB_PERIPHERAL_IDLE: 366 ppb_peripheral_terminate(ppbus, 0); 367 /* FALLTHROUGH */ 368 369 case PPB_FORWARD_IDLE: 370 /* if can't negotiate NIBBLE mode then try BYTE mode, 371 * the peripheral may be a computer 372 */ 373 if ((ppb_1284_negociate(ppbus, 374 ppi->ppi_mode = PPB_NIBBLE, 0))) { 375 /* XXX Wait 2 seconds to let the remote host some 376 * time to terminate its interrupt 377 */ 378 ppb_sleep(ppbus, ppi, PPBPRI, "ppiread", 2 * hz); 379 380 if ((error = ppb_1284_negociate(ppbus, 381 ppi->ppi_mode = PPB_BYTE, 0))) { 382 ppb_unlock(ppbus); 383 free(buffer, M_DEVBUF); 384 return (error); 385 } 386 } 387 break; 388 389 case PPB_REVERSE_IDLE: 390 case PPB_EPP_IDLE: 391 case PPB_ECP_FORWARD_IDLE: 392 default: 393 break; 394 } 395 396 #ifdef DEBUG_1284 397 printf("N"); 398 #endif 399 /* read data */ 400 len = 0; 401 while (uio->uio_resid) { 402 error = ppb_1284_read(ppbus, ppi->ppi_mode, 403 buffer, min(BUFSIZE, uio->uio_resid), &len); 404 ppb_unlock(ppbus); 405 if (error) 406 goto error; 407 408 if (!len) 409 goto error; /* no more data */ 410 411 #ifdef DEBUG_1284 412 printf("d"); 413 #endif 414 if ((error = uiomove(buffer, len, uio))) 415 goto error; 416 ppb_lock(ppbus); 417 } 418 ppb_unlock(ppbus); 419 420 error: 421 free(buffer, M_DEVBUF); 422 #else /* PERIPH_1284 */ 423 int error = ENODEV; 424 #endif 425 426 return (error); 427 } 428 429 /* 430 * ppiwrite() 431 * 432 * IEEE1284 compliant write 433 * 434 * Actually, this is the peripheral side of a remote IEEE1284 read 435 * 436 * The first part of the negotiation (IEEE1284 device detection) is 437 * done at interrupt level, then the remaining is done by the writing 438 * process 439 * 440 * Once negotiation done, transfer data 441 */ 442 static int 443 ppiwrite(struct cdev *dev, struct uio *uio, int ioflag) 444 { 445 #ifdef PERIPH_1284 446 struct ppi_data *ppi = dev->si_drv1; 447 device_t ppidev = ppi->ppi_device; 448 device_t ppbus = device_get_parent(ppidev); 449 int len, error = 0, sent; 450 char *buffer; 451 452 #if 0 453 int ret; 454 455 #define ADDRESS MS_PARAM(0, 0, MS_TYP_PTR) 456 #define LENGTH MS_PARAM(0, 1, MS_TYP_INT) 457 458 struct ppb_microseq msq[] = { 459 { MS_OP_PUT, { MS_UNKNOWN, MS_UNKNOWN, MS_UNKNOWN } }, 460 MS_RET(0) 461 }; 462 463 buffer = malloc(BUFSIZE, M_DEVBUF, M_WAITOK); 464 ppb_lock(ppbus); 465 466 /* negotiate ECP mode */ 467 if (ppb_1284_negociate(ppbus, PPB_ECP, 0)) { 468 printf("ppiwrite: ECP negotiation failed\n"); 469 } 470 471 while (!error && (len = min(uio->uio_resid, BUFSIZE))) { 472 ppb_unlock(ppbus); 473 uiomove(buffer, len, uio); 474 475 ppb_MS_init_msq(msq, 2, ADDRESS, buffer, LENGTH, len); 476 477 ppb_lock(ppbus); 478 error = ppb_MS_microseq(ppbus, msq, &ret); 479 } 480 #else 481 buffer = malloc(BUFSIZE, M_DEVBUF, M_WAITOK); 482 ppb_lock(ppbus); 483 #endif 484 485 /* we have to be peripheral to be able to send data, so 486 * wait for the appropriate state 487 */ 488 if (ppb_1284_get_state(ppbus) < PPB_PERIPHERAL_NEGOCIATION) 489 ppb_1284_terminate(ppbus); 490 491 while (ppb_1284_get_state(ppbus) != PPB_PERIPHERAL_IDLE) { 492 /* XXX should check a variable before sleeping */ 493 #ifdef DEBUG_1284 494 printf("s"); 495 #endif 496 497 ppi_enable_intr(ppidev); 498 499 /* sleep until IEEE1284 negotiation starts */ 500 error = ppb_sleep(ppbus, ppi, PCATCH | PPBPRI, "ppiwrite", 0); 501 502 switch (error) { 503 case 0: 504 /* negotiate peripheral side with BYTE mode */ 505 ppb_peripheral_negociate(ppbus, PPB_BYTE, 0); 506 break; 507 case EWOULDBLOCK: 508 break; 509 default: 510 goto error; 511 } 512 } 513 #ifdef DEBUG_1284 514 printf("N"); 515 #endif 516 517 /* negotiation done, write bytes to master host */ 518 while ((len = min(uio->uio_resid, BUFSIZE)) != 0) { 519 ppb_unlock(ppbus); 520 uiomove(buffer, len, uio); 521 ppb_lock(ppbus); 522 if ((error = byte_peripheral_write(ppbus, 523 buffer, len, &sent))) 524 goto error; 525 #ifdef DEBUG_1284 526 printf("d"); 527 #endif 528 } 529 530 error: 531 ppb_unlock(ppbus); 532 free(buffer, M_DEVBUF); 533 #else /* PERIPH_1284 */ 534 int error = ENODEV; 535 #endif 536 537 return (error); 538 } 539 540 static int 541 ppiioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags, struct thread *td) 542 { 543 struct ppi_data *ppi = dev->si_drv1; 544 device_t ppidev = ppi->ppi_device; 545 device_t ppbus = device_get_parent(ppidev); 546 int error = 0; 547 u_int8_t *val = (u_int8_t *)data; 548 549 ppb_lock(ppbus); 550 switch (cmd) { 551 case PPIGDATA: /* get data register */ 552 *val = ppb_rdtr(ppbus); 553 break; 554 case PPIGSTATUS: /* get status bits */ 555 *val = ppb_rstr(ppbus); 556 break; 557 case PPIGCTRL: /* get control bits */ 558 *val = ppb_rctr(ppbus); 559 break; 560 case PPIGEPPD: /* get EPP data bits */ 561 *val = ppb_repp_D(ppbus); 562 break; 563 case PPIGECR: /* get ECP bits */ 564 *val = ppb_recr(ppbus); 565 break; 566 case PPIGFIFO: /* read FIFO */ 567 *val = ppb_rfifo(ppbus); 568 break; 569 case PPISDATA: /* set data register */ 570 ppb_wdtr(ppbus, *val); 571 break; 572 case PPISSTATUS: /* set status bits */ 573 ppb_wstr(ppbus, *val); 574 break; 575 case PPISCTRL: /* set control bits */ 576 ppb_wctr(ppbus, *val); 577 break; 578 case PPISEPPD: /* set EPP data bits */ 579 ppb_wepp_D(ppbus, *val); 580 break; 581 case PPISECR: /* set ECP bits */ 582 ppb_wecr(ppbus, *val); 583 break; 584 case PPISFIFO: /* write FIFO */ 585 ppb_wfifo(ppbus, *val); 586 break; 587 case PPIGEPPA: /* get EPP address bits */ 588 *val = ppb_repp_A(ppbus); 589 break; 590 case PPISEPPA: /* set EPP address bits */ 591 ppb_wepp_A(ppbus, *val); 592 break; 593 default: 594 error = ENOTTY; 595 break; 596 } 597 ppb_unlock(ppbus); 598 599 return (error); 600 } 601 602 static device_method_t ppi_methods[] = { 603 /* device interface */ 604 DEVMETHOD(device_identify, ppi_identify), 605 DEVMETHOD(device_probe, ppi_probe), 606 DEVMETHOD(device_attach, ppi_attach), 607 DEVMETHOD(device_detach, ppi_detach), 608 { 0, 0 } 609 }; 610 611 static driver_t ppi_driver = { 612 "ppi", 613 ppi_methods, 614 sizeof(struct ppi_data), 615 }; 616 617 DRIVER_MODULE(ppi, ppbus, ppi_driver, 0, 0); 618 MODULE_DEPEND(ppi, ppbus, 1, 1, 1); 619