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: releng/6.4/sys/dev/ppbus/ppi.c 160503 2006-07-19 16:31:12Z kib $"); 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", 0); 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(device_get_parent(ppidev), ppidev, ppi->intr_resource, 280 INTR_TYPE_TTY, ppiintr, dev, &ppi->intr_cookie); 281 } 282 #endif /* PERIPH_1284 */ 283 } 284 ppi->ppi_count += 1; 285 286 return (0); 287 } 288 289 static int 290 ppiclose(struct cdev *dev, int flags, int fmt, struct thread *td) 291 { 292 u_int unit = minor(dev); 293 struct ppi_data *ppi = UNITOSOFTC(unit); 294 device_t ppidev = UNITODEVICE(unit); 295 device_t ppbus = device_get_parent(ppidev); 296 297 ppi->ppi_count --; 298 if (!ppi->ppi_count) { 299 300 #ifdef PERIPH_1284 301 switch (ppb_1284_get_state(ppbus)) { 302 case PPB_PERIPHERAL_IDLE: 303 ppb_peripheral_terminate(ppbus, 0); 304 break; 305 case PPB_REVERSE_IDLE: 306 case PPB_EPP_IDLE: 307 case PPB_ECP_FORWARD_IDLE: 308 default: 309 ppb_1284_terminate(ppbus); 310 break; 311 } 312 #endif /* PERIPH_1284 */ 313 314 /* unregistration of interrupt forced by release */ 315 ppb_release_bus(ppbus, ppidev); 316 317 ppi->ppi_flags &= ~HAVE_PPBUS; 318 } 319 320 return (0); 321 } 322 323 /* 324 * ppiread() 325 * 326 * IEEE1284 compliant read. 327 * 328 * First, try negotiation to BYTE then NIBBLE mode 329 * If no data is available, wait for it otherwise transfer as much as possible 330 */ 331 static int 332 ppiread(struct cdev *dev, struct uio *uio, int ioflag) 333 { 334 #ifdef PERIPH_1284 335 u_int unit = minor(dev); 336 struct ppi_data *ppi = UNITOSOFTC(unit); 337 device_t ppidev = UNITODEVICE(unit); 338 device_t ppbus = device_get_parent(ppidev); 339 int len, error = 0; 340 341 switch (ppb_1284_get_state(ppbus)) { 342 case PPB_PERIPHERAL_IDLE: 343 ppb_peripheral_terminate(ppbus, 0); 344 /* FALLTHROUGH */ 345 346 case PPB_FORWARD_IDLE: 347 /* if can't negotiate NIBBLE mode then try BYTE mode, 348 * the peripheral may be a computer 349 */ 350 if ((ppb_1284_negociate(ppbus, 351 ppi->ppi_mode = PPB_NIBBLE, 0))) { 352 353 /* XXX Wait 2 seconds to let the remote host some 354 * time to terminate its interrupt 355 */ 356 tsleep(ppi, PPBPRI, "ppiread", 2*hz); 357 358 if ((error = ppb_1284_negociate(ppbus, 359 ppi->ppi_mode = PPB_BYTE, 0))) 360 return (error); 361 } 362 break; 363 364 case PPB_REVERSE_IDLE: 365 case PPB_EPP_IDLE: 366 case PPB_ECP_FORWARD_IDLE: 367 default: 368 break; 369 } 370 371 #ifdef DEBUG_1284 372 printf("N"); 373 #endif 374 /* read data */ 375 len = 0; 376 while (uio->uio_resid) { 377 if ((error = ppb_1284_read(ppbus, ppi->ppi_mode, 378 ppi->ppi_buffer, min(BUFSIZE, uio->uio_resid), 379 &len))) { 380 goto error; 381 } 382 383 if (!len) 384 goto error; /* no more data */ 385 386 #ifdef DEBUG_1284 387 printf("d"); 388 #endif 389 if ((error = uiomove(ppi->ppi_buffer, len, uio))) 390 goto error; 391 } 392 393 error: 394 395 #else /* PERIPH_1284 */ 396 int error = ENODEV; 397 #endif 398 399 return (error); 400 } 401 402 /* 403 * ppiwrite() 404 * 405 * IEEE1284 compliant write 406 * 407 * Actually, this is the peripheral side of a remote IEEE1284 read 408 * 409 * The first part of the negotiation (IEEE1284 device detection) is 410 * done at interrupt level, then the remaining is done by the writing 411 * process 412 * 413 * Once negotiation done, transfer data 414 */ 415 static int 416 ppiwrite(struct cdev *dev, struct uio *uio, int ioflag) 417 { 418 #ifdef PERIPH_1284 419 u_int unit = minor(dev); 420 struct ppi_data *ppi = UNITOSOFTC(unit); 421 device_t ppidev = UNITODEVICE(unit); 422 device_t ppbus = device_get_parent(ppidev); 423 int len, error = 0, sent; 424 425 #if 0 426 int ret; 427 428 #define ADDRESS MS_PARAM(0, 0, MS_TYP_PTR) 429 #define LENGTH MS_PARAM(0, 1, MS_TYP_INT) 430 431 struct ppb_microseq msq[] = { 432 { MS_OP_PUT, { MS_UNKNOWN, MS_UNKNOWN, MS_UNKNOWN } }, 433 MS_RET(0) 434 }; 435 436 /* negotiate ECP mode */ 437 if (ppb_1284_negociate(ppbus, PPB_ECP, 0)) { 438 printf("ppiwrite: ECP negotiation failed\n"); 439 } 440 441 while (!error && (len = min(uio->uio_resid, BUFSIZE))) { 442 uiomove(ppi->ppi_buffer, len, uio); 443 444 ppb_MS_init_msq(msq, 2, ADDRESS, ppi->ppi_buffer, LENGTH, len); 445 446 error = ppb_MS_microseq(ppbus, msq, &ret); 447 } 448 #endif 449 450 /* we have to be peripheral to be able to send data, so 451 * wait for the appropriate state 452 */ 453 if (ppb_1284_get_state(ppbus) < PPB_PERIPHERAL_NEGOCIATION) 454 ppb_1284_terminate(ppbus); 455 456 while (ppb_1284_get_state(ppbus) != PPB_PERIPHERAL_IDLE) { 457 /* XXX should check a variable before sleeping */ 458 #ifdef DEBUG_1284 459 printf("s"); 460 #endif 461 462 ppi_enable_intr(ppidev); 463 464 /* sleep until IEEE1284 negotiation starts */ 465 error = tsleep(ppi, PCATCH | PPBPRI, "ppiwrite", 0); 466 467 switch (error) { 468 case 0: 469 /* negotiate peripheral side with BYTE mode */ 470 ppb_peripheral_negociate(ppbus, PPB_BYTE, 0); 471 break; 472 case EWOULDBLOCK: 473 break; 474 default: 475 goto error; 476 } 477 } 478 #ifdef DEBUG_1284 479 printf("N"); 480 #endif 481 482 /* negotiation done, write bytes to master host */ 483 while ((len = min(uio->uio_resid, BUFSIZE)) != 0) { 484 uiomove(ppi->ppi_buffer, len, uio); 485 if ((error = byte_peripheral_write(ppbus, 486 ppi->ppi_buffer, len, &sent))) 487 goto error; 488 #ifdef DEBUG_1284 489 printf("d"); 490 #endif 491 } 492 493 error: 494 495 #else /* PERIPH_1284 */ 496 int error = ENODEV; 497 #endif 498 499 return (error); 500 } 501 502 static int 503 ppiioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags, struct thread *td) 504 { 505 u_int unit = minor(dev); 506 device_t ppidev = UNITODEVICE(unit); 507 device_t ppbus = device_get_parent(ppidev); 508 int error = 0; 509 u_int8_t *val = (u_int8_t *)data; 510 511 switch (cmd) { 512 513 case PPIGDATA: /* get data register */ 514 *val = ppb_rdtr(ppbus); 515 break; 516 case PPIGSTATUS: /* get status bits */ 517 *val = ppb_rstr(ppbus); 518 break; 519 case PPIGCTRL: /* get control bits */ 520 *val = ppb_rctr(ppbus); 521 break; 522 case PPIGEPPD: /* get EPP data bits */ 523 *val = ppb_repp_D(ppbus); 524 break; 525 case PPIGECR: /* get ECP bits */ 526 *val = ppb_recr(ppbus); 527 break; 528 case PPIGFIFO: /* read FIFO */ 529 *val = ppb_rfifo(ppbus); 530 break; 531 case PPISDATA: /* set data register */ 532 ppb_wdtr(ppbus, *val); 533 break; 534 case PPISSTATUS: /* set status bits */ 535 ppb_wstr(ppbus, *val); 536 break; 537 case PPISCTRL: /* set control bits */ 538 ppb_wctr(ppbus, *val); 539 break; 540 case PPISEPPD: /* set EPP data bits */ 541 ppb_wepp_D(ppbus, *val); 542 break; 543 case PPISECR: /* set ECP bits */ 544 ppb_wecr(ppbus, *val); 545 break; 546 case PPISFIFO: /* write FIFO */ 547 ppb_wfifo(ppbus, *val); 548 break; 549 case PPIGEPPA: /* get EPP address bits */ 550 *val = ppb_repp_A(ppbus); 551 break; 552 case PPISEPPA: /* set EPP address bits */ 553 ppb_wepp_A(ppbus, *val); 554 break; 555 default: 556 error = ENOTTY; 557 break; 558 } 559 560 return (error); 561 } 562 563 static device_method_t ppi_methods[] = { 564 /* device interface */ 565 DEVMETHOD(device_identify, ppi_identify), 566 DEVMETHOD(device_probe, ppi_probe), 567 DEVMETHOD(device_attach, ppi_attach), 568 569 { 0, 0 } 570 }; 571 572 static driver_t ppi_driver = { 573 "ppi", 574 ppi_methods, 575 sizeof(struct ppi_data), 576 }; 577 DRIVER_MODULE(ppi, ppbus, ppi_driver, ppi_devclass, 0, 0); 578 MODULE_DEPEND(ppi, ppbus, 1, 1, 1);
Cache object: ce658e2cc017a9ddfe5ceef644e5a71d
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