Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/dev/ic/cy.c
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1 /* $NetBSD: cy.c,v 1.63 2022/10/26 23:42:04 riastradh Exp $ */ 2 3 /* 4 * cy.c 5 * 6 * Driver for Cyclades Cyclom-8/16/32 multiport serial cards 7 * (currently not tested with Cyclom-32 cards) 8 * 9 * Timo Rossi, 1996 10 * 11 * Supports both ISA and PCI Cyclom cards 12 * 13 * Lots of debug output can be enabled by defining CY_DEBUG 14 * Some debugging counters (number of receive/transmit interrupts etc.) 15 * can be enabled by defining CY_DEBUG1 16 */ 17 18 #include <sys/cdefs.h> 19 __KERNEL_RCSID(0, "$NetBSD: cy.c,v 1.63 2022/10/26 23:42:04 riastradh Exp $"); 20 21 #include <sys/param.h> 22 #include <sys/ioctl.h> 23 #include <sys/syslog.h> 24 #include <sys/fcntl.h> 25 #include <sys/tty.h> 26 #include <sys/proc.h> 27 #include <sys/conf.h> 28 #include <sys/select.h> 29 #include <sys/device.h> 30 #include <sys/malloc.h> 31 #include <sys/systm.h> 32 #include <sys/callout.h> 33 #include <sys/kauth.h> 34 35 #include <sys/bus.h> 36 37 #include <dev/ic/cd1400reg.h> 38 #include <dev/ic/cyreg.h> 39 #include <dev/ic/cyvar.h> 40 41 #include "ioconf.h" 42 43 static int cyparam(struct tty *, struct termios *); 44 static void cystart(struct tty *); 45 static void cy_poll(void *); 46 static int cy_modem_control(struct cy_softc *, struct cy_port *, int, int); 47 static void cy_enable_transmitter(struct cy_softc *, struct cy_port *); 48 static void cd1400_channel_cmd(struct cy_softc *, struct cy_port *, int); 49 static int cy_speed(speed_t, int *, int *, int); 50 51 static dev_type_open(cyopen); 52 static dev_type_close(cyclose); 53 static dev_type_read(cyread); 54 static dev_type_write(cywrite); 55 static dev_type_ioctl(cyioctl); 56 static dev_type_stop(cystop); 57 static dev_type_tty(cytty); 58 static dev_type_poll(cypoll); 59 60 const struct cdevsw cy_cdevsw = { 61 .d_open = cyopen, 62 .d_close = cyclose, 63 .d_read = cyread, 64 .d_write = cywrite, 65 .d_ioctl = cyioctl, 66 .d_stop = cystop, 67 .d_tty = cytty, 68 .d_poll = cypoll, 69 .d_mmap = nommap, 70 .d_kqfilter = ttykqfilter, 71 .d_discard = nodiscard, 72 .d_flag = D_TTY 73 }; 74 75 static int cy_open = 0; 76 static int cy_events = 0; 77 78 int cy_attached_ttys; 79 bool cy_callout_init; 80 callout_t cy_poll_callout; 81 82 /* 83 * Common probe routine 84 */ 85 int 86 cy_find(struct cy_softc *sc) 87 { 88 int cy_chip, chip; 89 u_char firmware_ver; 90 bus_space_tag_t tag = sc->sc_memt; 91 bus_space_handle_t bsh = sc->sc_bsh; 92 int bustype = sc->sc_bustype; 93 94 /* Cyclom card hardware reset */ 95 bus_space_write_1(tag, bsh, CY16_RESET << bustype, 0); 96 DELAY(500); /* wait for reset to complete */ 97 bus_space_write_1(tag, bsh, CY_CLEAR_INTR << bustype, 0); 98 99 #ifdef CY_DEBUG 100 printf("cy: card reset done\n"); 101 #endif 102 sc->sc_nchips = 0; 103 104 for (cy_chip = 0, chip = 0; cy_chip < CY_MAX_CD1400s; 105 cy_chip++, chip += (CY_CD1400_MEMSPACING << bustype)) { 106 int i; 107 108 /* 109 * the last 4 nchips are 'interleaved' with the first 4 on 110 * 32-port boards 111 */ 112 if (cy_chip == 4) 113 chip -= (CY32_ADDR_FIX << bustype); 114 115 #ifdef CY_DEBUG 116 printf("sy: probe chip %d offset 0x%x ... ", cy_chip, chip); 117 #endif 118 119 /* wait until the chip is ready for command */ 120 DELAY(1000); 121 if (bus_space_read_1(tag, bsh, chip + 122 ((CD1400_CCR << 1) << bustype)) != 0) { 123 #ifdef CY_DEBUG 124 printf("not ready for command\n"); 125 #endif 126 break; 127 } 128 /* clear the firmware version reg. */ 129 bus_space_write_1(tag, bsh, chip + 130 ((CD1400_GFRCR << 1) << bustype), 0); 131 132 /* 133 * On Cyclom-16 references to non-existent chip 4 134 * actually access chip 0 (address line 9 not decoded). 135 * Here we check if the clearing of chip 4 GFRCR actually 136 * cleared chip 0 GFRCR. In that case we have a 16 port card. 137 */ 138 if (cy_chip == 4 && 139 bus_space_read_1(tag, bsh, /* off for chip 0 (0) + */ 140 ((CD1400_GFRCR << 1) << bustype)) == 0) 141 break; 142 143 /* reset the chip */ 144 bus_space_write_1(tag, bsh, chip + 145 ((CD1400_CCR << 1) << bustype), 146 CD1400_CCR_CMDRESET | CD1400_CCR_FULLRESET); 147 148 /* wait for the chip to initialize itself */ 149 for (i = 0; i < 200; i++) { 150 DELAY(50); 151 firmware_ver = bus_space_read_1(tag, bsh, chip + 152 ((CD1400_GFRCR << 1) << bustype)); 153 if ((firmware_ver & 0xf0) == 0x40) /* found a CD1400 */ 154 break; 155 } 156 #ifdef CY_DEBUG 157 printf("firmware version 0x%x\n", firmware_ver); 158 #endif 159 160 if ((firmware_ver & 0xf0) != 0x40) 161 break; 162 163 /* firmware version OK, CD1400 found */ 164 sc->sc_nchips++; 165 } 166 167 if (sc->sc_nchips == 0) { 168 #ifdef CY_DEBUG 169 printf("no CD1400s found\n"); 170 #endif 171 return 0; 172 } 173 #ifdef CY_DEBUG 174 printf("found %d CD1400s\n", sc->sc_nchips); 175 #endif 176 177 return 1; 178 } 179 180 void 181 cy_attach(struct cy_softc *sc) 182 { 183 int port, cy_chip, num_chips, cdu, chip; 184 int cy_clock; 185 186 if (!cy_callout_init) { 187 cy_callout_init = true; 188 callout_init(&cy_poll_callout, 0); 189 } 190 191 num_chips = sc->sc_nchips; 192 if (num_chips == 0) 193 return; 194 195 memset(sc->sc_ports, 0, sizeof(sc->sc_ports)); 196 197 port = 0; 198 for (cy_chip = 0, chip = 0; cy_chip < num_chips; cy_chip++, 199 chip += (CY_CD1400_MEMSPACING << sc->sc_bustype)) { 200 201 if (cy_chip == 4) 202 chip -= (CY32_ADDR_FIX << sc->sc_bustype); 203 204 #ifdef CY_DEBUG 205 aprint_debug("attach CD1400 #%d offset 0x%x\n", cy_chip, chip); 206 #endif 207 sc->sc_cd1400_offs[cy_chip] = chip; 208 209 /* 210 * configure port 0 as serial port (should already be after 211 * reset) 212 */ 213 cd_write_reg(sc, cy_chip, CD1400_GCR, 0); 214 215 if (cd_read_reg(sc, cy_chip, CD1400_GFRCR) <= 0x46) 216 cy_clock = CY_CLOCK; 217 else 218 cy_clock = CY_CLOCK_60; 219 220 /* set up a receive timeout period (1ms) */ 221 cd_write_reg(sc, cy_chip, CD1400_PPR, 222 (cy_clock / CD1400_PPR_PRESCALER / 1000) + 1); 223 224 for (cdu = 0; cdu < CD1400_NO_OF_CHANNELS; cdu++) { 225 sc->sc_ports[port].cy_softc = sc; 226 sc->sc_ports[port].cy_port_num = port; 227 sc->sc_ports[port].cy_chip = cy_chip; 228 sc->sc_ports[port].cy_clock = cy_clock; 229 230 /* should we initialize anything else here? */ 231 port++; 232 } /* for(each port on one CD1400...) */ 233 234 } /* for(each CD1400 on a card... ) */ 235 236 sc->sc_nchannels = port; 237 238 aprint_normal_dev(sc->sc_dev, "%d channels (ttyCY%03d..ttyCY%03d)\n", 239 sc->sc_nchannels, cy_attached_ttys, 240 cy_attached_ttys + (sc->sc_nchannels - 1)); 241 242 cy_attached_ttys += sc->sc_nchannels; 243 244 /* ensure an edge for the next interrupt */ 245 bus_space_write_1(sc->sc_memt, sc->sc_bsh, 246 CY_CLEAR_INTR << sc->sc_bustype, 0); 247 } 248 249 #define CY_UNIT(dev) TTUNIT(dev) 250 #define CY_DIALOUT(dev) TTDIALOUT(dev) 251 252 #define CY_PORT(dev) cy_getport((dev)) 253 #define CY_BOARD(cy) ((cy)->cy_softc) 254 255 static struct cy_port * 256 cy_getport(dev_t dev) 257 { 258 int i, j, k, u = CY_UNIT(dev); 259 struct cy_softc *sc; 260 261 for (i = 0, j = 0; i < cy_cd.cd_ndevs; i++) { 262 k = j; 263 sc = device_lookup_private(&cy_cd, i); 264 if (sc == NULL) 265 continue; 266 if (sc->sc_nchannels == 0) 267 continue; 268 j += sc->sc_nchannels; 269 if (j > u) 270 return (&sc->sc_ports[u - k]); 271 } 272 273 return (NULL); 274 } 275 276 /* 277 * open routine. returns zero if successful, else error code 278 */ 279 int 280 cyopen(dev_t dev, int flag, int mode, struct lwp *l) 281 { 282 struct cy_softc *sc; 283 struct cy_port *cy; 284 struct tty *tp; 285 int s, error; 286 287 cy = CY_PORT(dev); 288 if (cy == NULL) 289 return (ENXIO); 290 sc = CY_BOARD(cy); 291 292 s = spltty(); 293 if (cy->cy_tty == NULL) { 294 if ((cy->cy_tty = tty_alloc()) == NULL) { 295 splx(s); 296 aprint_error_dev(sc->sc_dev, 297 "port %d: can't allocate tty\n", 298 cy->cy_port_num); 299 return (ENOMEM); 300 } 301 tty_attach(cy->cy_tty); 302 } 303 splx(s); 304 305 tp = cy->cy_tty; 306 tp->t_oproc = cystart; 307 tp->t_param = cyparam; 308 tp->t_dev = dev; 309 310 if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp)) 311 return (EBUSY); 312 313 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 314 ttychars(tp); 315 tp->t_iflag = TTYDEF_IFLAG; 316 tp->t_oflag = TTYDEF_OFLAG; 317 tp->t_cflag = TTYDEF_CFLAG; 318 if (ISSET(cy->cy_openflags, TIOCFLAG_CLOCAL)) 319 SET(tp->t_cflag, CLOCAL); 320 if (ISSET(cy->cy_openflags, TIOCFLAG_CRTSCTS)) 321 SET(tp->t_cflag, CRTSCTS); 322 if (ISSET(cy->cy_openflags, TIOCFLAG_MDMBUF)) 323 SET(tp->t_cflag, MDMBUF); 324 tp->t_lflag = TTYDEF_LFLAG; 325 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 326 327 s = spltty(); 328 329 /* 330 * Allocate input ring buffer if we don't already have one 331 */ 332 if (cy->cy_ibuf == NULL) { 333 cy->cy_ibuf = malloc(CY_IBUF_SIZE, M_DEVBUF, M_WAITOK); 334 cy->cy_ibuf_end = cy->cy_ibuf + CY_IBUF_SIZE; 335 } 336 /* mark the ring buffer as empty */ 337 cy->cy_ibuf_rd_ptr = cy->cy_ibuf_wr_ptr = cy->cy_ibuf; 338 339 /* select CD1400 channel */ 340 cd_write_reg(sc, cy->cy_chip, CD1400_CAR, 341 cy->cy_port_num & CD1400_CAR_CHAN); 342 /* reset the channel */ 343 cd1400_channel_cmd(sc, cy, CD1400_CCR_CMDRESET); 344 /* encode unit (port) number in LIVR */ 345 /* there is just enough space for 5 bits (32 ports) */ 346 cd_write_reg(sc, cy->cy_chip, CD1400_LIVR, 347 cy->cy_port_num << 3); 348 349 cy->cy_channel_control = 0; 350 351 /* hmm... need spltty() here? */ 352 if (cy_open == 0) { 353 cy_open = 1; 354 callout_reset(&cy_poll_callout, 1, cy_poll, NULL); 355 } 356 /* this sets parameters and raises DTR */ 357 cyparam(tp, &tp->t_termios); 358 359 ttsetwater(tp); 360 361 /* raise RTS too */ 362 cy_modem_control(sc, cy, TIOCM_RTS, DMBIS); 363 364 cy->cy_carrier_stat = 365 cd_read_reg(sc, cy->cy_chip, CD1400_MSVR2); 366 367 /* enable receiver and modem change interrupts */ 368 cd_write_reg(sc, cy->cy_chip, CD1400_SRER, 369 CD1400_SRER_MDMCH | CD1400_SRER_RXDATA); 370 371 if (CY_DIALOUT(dev) || 372 ISSET(cy->cy_openflags, TIOCFLAG_SOFTCAR) || 373 ISSET(tp->t_cflag, MDMBUF) || 374 ISSET(cy->cy_carrier_stat, CD1400_MSVR2_CD)) 375 SET(tp->t_state, TS_CARR_ON); 376 else 377 CLR(tp->t_state, TS_CARR_ON); 378 splx(s); 379 } 380 381 /* wait for carrier if necessary */ 382 if (!ISSET(flag, O_NONBLOCK)) { 383 ttylock(tp); 384 while (!ISSET(tp->t_cflag, CLOCAL) && 385 !ISSET(tp->t_state, TS_CARR_ON)) { 386 tp->t_wopen++; 387 error = ttysleep(tp, &tp->t_rawcv, true, 0); 388 tp->t_wopen--; 389 if (error != 0) { 390 ttyunlock(tp); 391 return error; 392 } 393 } 394 ttyunlock(tp); 395 } 396 397 return (*tp->t_linesw->l_open) (dev, tp); 398 } 399 400 /* 401 * close routine. returns zero if successful, else error code 402 */ 403 int 404 cyclose(dev_t dev, int flag, int mode, struct lwp *l) 405 { 406 struct cy_softc *sc; 407 struct cy_port *cy; 408 struct tty *tp; 409 int s; 410 411 cy = CY_PORT(dev); 412 sc = CY_BOARD(cy); 413 tp = cy->cy_tty; 414 415 (*tp->t_linesw->l_close) (tp, flag); 416 s = spltty(); 417 418 if (ISSET(tp->t_cflag, HUPCL) && 419 !ISSET(cy->cy_openflags, TIOCFLAG_SOFTCAR)) { 420 /* 421 * drop DTR and RTS (should we wait for output buffer to 422 * become empty first?) 423 */ 424 cy_modem_control(sc, cy, 0, DMSET); 425 } 426 /* 427 * XXX should we disable modem change and 428 * receive interrupts here or somewhere ? 429 */ 430 CLR(tp->t_state, TS_BUSY | TS_FLUSH); 431 432 splx(s); 433 ttyclose(tp); 434 435 return 0; 436 } 437 438 /* 439 * Read routine 440 */ 441 int 442 cyread(dev_t dev, struct uio *uio, int flag) 443 { 444 struct cy_port *cy; 445 struct tty *tp; 446 447 cy = CY_PORT(dev); 448 tp = cy->cy_tty; 449 450 return ((*tp->t_linesw->l_read)(tp, uio, flag)); 451 } 452 453 /* 454 * Write routine 455 */ 456 int 457 cywrite(dev_t dev, struct uio *uio, int flag) 458 { 459 struct cy_port *cy; 460 struct tty *tp; 461 462 cy = CY_PORT(dev); 463 tp = cy->cy_tty; 464 465 return ((*tp->t_linesw->l_write)(tp, uio, flag)); 466 } 467 468 /* 469 * Poll routine 470 */ 471 int 472 cypoll(dev_t dev, int events, struct lwp *l) 473 { 474 struct cy_port *cy; 475 struct tty *tp; 476 477 cy = CY_PORT(dev); 478 tp = cy->cy_tty; 479 480 return ((*tp->t_linesw->l_poll)(tp, events, l)); 481 } 482 483 /* 484 * return tty pointer 485 */ 486 struct tty * 487 cytty(dev_t dev) 488 { 489 struct cy_port *cy; 490 491 cy = CY_PORT(dev); 492 493 return (cy->cy_tty); 494 } 495 496 /* 497 * ioctl routine 498 */ 499 int 500 cyioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 501 { 502 struct cy_softc *sc; 503 struct cy_port *cy; 504 struct tty *tp; 505 int error; 506 507 cy = CY_PORT(dev); 508 sc = CY_BOARD(cy); 509 tp = cy->cy_tty; 510 511 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 512 if (error != EPASSTHROUGH) 513 return error; 514 515 error = ttioctl(tp, cmd, data, flag, l); 516 if (error != EPASSTHROUGH) 517 return error; 518 519 /* XXX should not allow dropping DTR when dialin? */ 520 521 switch (cmd) { 522 case TIOCSBRK: /* start break */ 523 SET(cy->cy_flags, CY_F_START_BREAK); 524 cy_enable_transmitter(sc, cy); 525 break; 526 527 case TIOCCBRK: /* stop break */ 528 SET(cy->cy_flags, CY_F_END_BREAK); 529 cy_enable_transmitter(sc, cy); 530 break; 531 532 case TIOCSDTR: /* DTR on */ 533 cy_modem_control(sc, cy, TIOCM_DTR, DMBIS); 534 break; 535 536 case TIOCCDTR: /* DTR off */ 537 cy_modem_control(sc, cy, TIOCM_DTR, DMBIC); 538 break; 539 540 case TIOCMSET: /* set new modem control line values */ 541 cy_modem_control(sc, cy, *((int *) data), DMSET); 542 break; 543 544 case TIOCMBIS: /* turn modem control bits on */ 545 cy_modem_control(sc, cy, *((int *) data), DMBIS); 546 break; 547 548 case TIOCMBIC: /* turn modem control bits off */ 549 cy_modem_control(sc, cy, *((int *) data), DMBIC); 550 break; 551 552 case TIOCMGET: /* get modem control/status line state */ 553 *((int *) data) = cy_modem_control(sc, cy, 0, DMGET); 554 break; 555 556 case TIOCGFLAGS: 557 *((int *) data) = cy->cy_openflags | 558 (CY_DIALOUT(dev) ? TIOCFLAG_SOFTCAR : 0); 559 break; 560 561 case TIOCSFLAGS: 562 error = kauth_authorize_device_tty(l->l_cred, 563 KAUTH_DEVICE_TTY_PRIVSET, tp); 564 if (error != 0) 565 return EPERM; 566 567 cy->cy_openflags = *((int *) data) & 568 (TIOCFLAG_SOFTCAR | TIOCFLAG_CLOCAL | 569 TIOCFLAG_CRTSCTS | TIOCFLAG_MDMBUF); 570 break; 571 572 default: 573 return EPASSTHROUGH; 574 } 575 576 return 0; 577 } 578 579 /* 580 * start output 581 */ 582 void 583 cystart(struct tty *tp) 584 { 585 struct cy_softc *sc; 586 struct cy_port *cy; 587 int s; 588 589 cy = CY_PORT(tp->t_dev); 590 sc = cy->cy_softc; 591 592 s = spltty(); 593 594 #ifdef CY_DEBUG1 595 cy->cy_start_count++; 596 #endif 597 598 if (!ISSET(tp->t_state, TS_TTSTOP | TS_TIMEOUT | TS_BUSY)) { 599 if (!ttypull(tp)) 600 goto out; 601 SET(tp->t_state, TS_BUSY); 602 cy_enable_transmitter(sc, cy); 603 } 604 out: 605 606 splx(s); 607 } 608 609 /* 610 * stop output 611 */ 612 void 613 cystop(struct tty *tp, int flag) 614 { 615 struct cy_port *cy; 616 int s; 617 618 cy = CY_PORT(tp->t_dev); 619 620 s = spltty(); 621 if (ISSET(tp->t_state, TS_BUSY)) { 622 if (!ISSET(tp->t_state, TS_TTSTOP)) 623 SET(tp->t_state, TS_FLUSH); 624 625 /* 626 * the transmit interrupt routine will disable transmit when it 627 * notices that CY_F_STOP has been set. 628 */ 629 SET(cy->cy_flags, CY_F_STOP); 630 } 631 splx(s); 632 } 633 634 /* 635 * parameter setting routine. 636 * returns 0 if successful, else returns error code 637 */ 638 int 639 cyparam(struct tty *tp, struct termios *t) 640 { 641 struct cy_softc *sc; 642 struct cy_port *cy; 643 int ibpr = 0, obpr = 0, i_clk_opt = 0, o_clk_opt = 0; /* XXX: GCC */ 644 int s, opt; 645 646 cy = CY_PORT(tp->t_dev); 647 sc = CY_BOARD(cy); 648 649 if (t->c_ospeed != 0 && cy_speed(t->c_ospeed, &o_clk_opt, &obpr, cy->cy_clock) < 0) 650 return EINVAL; 651 652 if (t->c_ispeed != 0 && cy_speed(t->c_ispeed, &i_clk_opt, &ibpr, cy->cy_clock) < 0) 653 return EINVAL; 654 655 s = spltty(); 656 657 /* hang up the line is ospeed is zero, else turn DTR on */ 658 cy_modem_control(sc, cy, TIOCM_DTR, (t->c_ospeed == 0 ? DMBIC : DMBIS)); 659 660 /* channel was selected by the above call to cy_modem_control() */ 661 #if 0 662 cd_write_reg(sc, cy->cy_chip, CD1400_CAR, port & CD1400_CAR_CHAN); 663 #endif 664 665 /* set transmit speed */ 666 if (t->c_ospeed != 0) { 667 cd_write_reg(sc, cy->cy_chip, CD1400_TCOR, o_clk_opt); 668 cd_write_reg(sc, cy->cy_chip, CD1400_TBPR, obpr); 669 } 670 /* set receive speed */ 671 if (t->c_ispeed != 0) { 672 cd_write_reg(sc, cy->cy_chip, CD1400_RCOR, i_clk_opt); 673 cd_write_reg(sc, cy->cy_chip, CD1400_RBPR, ibpr); 674 } 675 opt = CD1400_CCR_CMDCHANCTL | CD1400_CCR_XMTEN 676 | (ISSET(t->c_cflag, CREAD) ? CD1400_CCR_RCVEN : CD1400_CCR_RCVDIS); 677 678 if (opt != cy->cy_channel_control) { 679 cy->cy_channel_control = opt; 680 cd1400_channel_cmd(sc, cy, opt); 681 } 682 /* compute COR1 contents */ 683 opt = 0; 684 if (ISSET(t->c_cflag, PARENB)) { 685 if (ISSET(t->c_cflag, PARODD)) 686 opt |= CD1400_COR1_PARODD; 687 opt |= CD1400_COR1_PARNORMAL; 688 } 689 if (!ISSET(t->c_iflag, INPCK)) 690 opt |= CD1400_COR1_NOINPCK; /* no parity checking */ 691 692 if (ISSET(t->c_cflag, CSTOPB)) 693 opt |= CD1400_COR1_STOP2; 694 695 switch (t->c_cflag & CSIZE) { 696 case CS5: 697 opt |= CD1400_COR1_CS5; 698 break; 699 700 case CS6: 701 opt |= CD1400_COR1_CS6; 702 break; 703 704 case CS7: 705 opt |= CD1400_COR1_CS7; 706 break; 707 708 default: 709 opt |= CD1400_COR1_CS8; 710 break; 711 } 712 713 cd_write_reg(sc, cy->cy_chip, CD1400_COR1, opt); 714 715 #ifdef CY_DEBUG 716 printf("cor1 = 0x%x...", opt); 717 #endif 718 719 /* 720 * use the CD1400 automatic CTS flow control if CRTSCTS is set 721 * 722 * CD1400_COR2_ETC is used because breaks are generated with 723 * embedded transmit commands 724 */ 725 cd_write_reg(sc, cy->cy_chip, CD1400_COR2, 726 CD1400_COR2_ETC | 727 (ISSET(t->c_cflag, CRTSCTS) ? CD1400_COR2_CCTS_OFLOW : 0)); 728 729 cd_write_reg(sc, cy->cy_chip, CD1400_COR3, CY_RX_FIFO_THRESHOLD); 730 731 cd1400_channel_cmd(sc, cy, CD1400_CCR_CMDCORCHG | 732 CD1400_CCR_COR1 | CD1400_CCR_COR2 | CD1400_CCR_COR3); 733 734 cd_write_reg(sc, cy->cy_chip, CD1400_COR4, CD1400_COR4_PFO_EXCEPTION); 735 cd_write_reg(sc, cy->cy_chip, CD1400_COR5, 0); 736 737 /* 738 * set modem change option registers to generate interrupts 739 * on carrier detect changes. 740 * 741 * if hardware RTS handshaking is used 742 * also set the handshaking threshold. 743 */ 744 if (cy->cy_clock == CY_CLOCK_60) { 745 cd_write_reg(sc, cy->cy_chip, CD1400_MCOR1, CD1400_MCOR1_CDzd | 746 (ISSET(t->c_cflag, CRTSCTS) ? CY_RX_DTR_THRESHOLD : 0)); 747 } else { 748 cd_write_reg(sc, cy->cy_chip, CD1400_MCOR1, CD1400_MCOR1_CDzd); 749 } 750 751 cd_write_reg(sc, cy->cy_chip, CD1400_MCOR2, CD1400_MCOR2_CDod); 752 753 /* 754 * set receive timeout to approx. 2ms 755 * could use more complex logic here... 756 * (but is it actually needed or even useful?) 757 */ 758 cd_write_reg(sc, cy->cy_chip, CD1400_RTPR, 2); 759 760 /* 761 * should do anything else here? 762 * XXX check MDMBUF handshaking like in com.c? 763 */ 764 765 splx(s); 766 return 0; 767 } 768 769 /* 770 * set/get modem line status 771 * 772 * bits can be: TIOCM_DTR, TIOCM_RTS, TIOCM_CTS, TIOCM_CD, TIOCM_RI, TIOCM_DSR 773 */ 774 int 775 cy_modem_control(struct cy_softc *sc, struct cy_port *cy, int bits, int howto) 776 { 777 struct tty *tp = cy->cy_tty; 778 int s, msvr; 779 780 s = spltty(); 781 782 /* select channel */ 783 cd_write_reg(sc, cy->cy_chip, CD1400_CAR, 784 cy->cy_port_num & CD1400_CAR_CHAN); 785 786 /* Does not manipulate RTS if it is used for flow control. */ 787 switch (howto) { 788 case DMGET: 789 bits = 0; 790 if (cy->cy_channel_control & CD1400_CCR_RCVEN) 791 bits |= TIOCM_LE; 792 msvr = cd_read_reg(sc, cy->cy_chip, CD1400_MSVR2); 793 if (cy->cy_clock == CY_CLOCK_60) { 794 if (cd_read_reg(sc, cy->cy_chip, CD1400_MSVR1) & 795 CD1400_MSVR1_RTS) 796 bits |= TIOCM_DTR; 797 if (msvr & CD1400_MSVR2_DTR) 798 bits |= TIOCM_RTS; 799 } else { 800 if (cd_read_reg(sc, cy->cy_chip, CD1400_MSVR1) & 801 CD1400_MSVR1_RTS) 802 bits |= TIOCM_RTS; 803 if (msvr & CD1400_MSVR2_DTR) 804 bits |= TIOCM_DTR; 805 } 806 if (msvr & CD1400_MSVR2_CTS) 807 bits |= TIOCM_CTS; 808 if (msvr & CD1400_MSVR2_CD) 809 bits |= TIOCM_CD; 810 /* Not connected on some Cyclom-Y boards? */ 811 if (msvr & CD1400_MSVR2_DSR) 812 bits |= TIOCM_DSR; 813 /* Not connected on some Cyclom-8Y boards? */ 814 if (msvr & CD1400_MSVR2_RI) 815 bits |= TIOCM_RI; 816 break; 817 818 case DMSET: /* replace old values with new ones */ 819 if (cy->cy_clock == CY_CLOCK_60) { 820 if (!ISSET(tp->t_cflag, CRTSCTS)) 821 cd_write_reg(sc, cy->cy_chip, CD1400_MSVR2, 822 ((bits & TIOCM_RTS) ? CD1400_MSVR2_DTR : 0)); 823 cd_write_reg(sc, cy->cy_chip, CD1400_MSVR1, 824 ((bits & TIOCM_DTR) ? CD1400_MSVR1_RTS : 0)); 825 } else { 826 if (!ISSET(tp->t_cflag, CRTSCTS)) 827 cd_write_reg(sc, cy->cy_chip, CD1400_MSVR1, 828 ((bits & TIOCM_RTS) ? CD1400_MSVR1_RTS : 0)); 829 cd_write_reg(sc, cy->cy_chip, CD1400_MSVR2, 830 ((bits & TIOCM_DTR) ? CD1400_MSVR2_DTR : 0)); 831 } 832 break; 833 834 case DMBIS: /* set bits */ 835 if (cy->cy_clock == CY_CLOCK_60) { 836 if (!ISSET(tp->t_cflag, CRTSCTS) && 837 (bits & TIOCM_RTS) != 0) 838 cd_write_reg(sc, cy->cy_chip, CD1400_MSVR2, 839 CD1400_MSVR2_DTR); 840 if (bits & TIOCM_DTR) 841 cd_write_reg(sc, cy->cy_chip, CD1400_MSVR1, 842 CD1400_MSVR1_RTS); 843 } else { 844 if (!ISSET(tp->t_cflag, CRTSCTS) && 845 (bits & TIOCM_RTS) != 0) 846 cd_write_reg(sc, cy->cy_chip, CD1400_MSVR1, 847 CD1400_MSVR1_RTS); 848 if (bits & TIOCM_DTR) 849 cd_write_reg(sc, cy->cy_chip, CD1400_MSVR2, 850 CD1400_MSVR2_DTR); 851 } 852 break; 853 854 case DMBIC: /* clear bits */ 855 if (cy->cy_clock == CY_CLOCK_60) { 856 if (!ISSET(tp->t_cflag, CRTSCTS) && (bits & TIOCM_RTS)) 857 cd_write_reg(sc, cy->cy_chip, CD1400_MSVR2, 0); 858 if (bits & TIOCM_DTR) 859 cd_write_reg(sc, cy->cy_chip, CD1400_MSVR1, 0); 860 } else { 861 if (!ISSET(tp->t_cflag, CRTSCTS) && (bits & TIOCM_RTS)) 862 cd_write_reg(sc, cy->cy_chip, CD1400_MSVR1, 0); 863 if (bits & TIOCM_DTR) 864 cd_write_reg(sc, cy->cy_chip, CD1400_MSVR2, 0); 865 } 866 break; 867 } 868 splx(s); 869 return ((howto == DMGET) ? bits : 0); 870 } 871 872 /* 873 * Upper-level handler loop (called from timer interrupt?) 874 * This routine is common for multiple cards 875 */ 876 void 877 cy_poll(void *arg) 878 { 879 int card, port; 880 struct cy_softc *sc; 881 struct cy_port *cy; 882 struct tty *tp; 883 static int counter = 0; 884 #ifdef CY_DEBUG1 885 int did_something; 886 #endif 887 int s = spltty(); 888 889 if (cy_events == 0 && ++counter < 200) { 890 splx(s); 891 goto out; 892 } 893 cy_events = 0; 894 splx(s); 895 896 for (card = 0; card < cy_cd.cd_ndevs; card++) { 897 sc = device_lookup_private(&cy_cd, card); 898 if (sc == NULL) 899 continue; 900 901 #ifdef CY_DEBUG1 902 sc->sc_poll_count1++; 903 did_something = 0; 904 #endif 905 906 for (port = 0; port < sc->sc_nchannels; port++) { 907 cy = &sc->sc_ports[port]; 908 if ((tp = cy->cy_tty) == NULL || cy->cy_ibuf == NULL || 909 (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0)) 910 continue; 911 912 /* 913 * handle received data 914 */ 915 while (cy->cy_ibuf_rd_ptr != cy->cy_ibuf_wr_ptr) { 916 u_char line_stat; 917 int chr; 918 919 line_stat = cy->cy_ibuf_rd_ptr[0]; 920 chr = cy->cy_ibuf_rd_ptr[1]; 921 922 if (line_stat & 923 (CD1400_RDSR_BREAK | CD1400_RDSR_FE)) 924 chr |= TTY_FE; 925 if (line_stat & CD1400_RDSR_PE) 926 chr |= TTY_PE; 927 928 /* 929 * on an overrun error the data is treated as 930 * good just as it should be. 931 */ 932 933 #ifdef CY_DEBUG 934 aprint_debug_dev(sc->sc_dev, 935 "port %d ttyinput 0x%x\n", 936 port, chr); 937 #endif 938 939 (*tp->t_linesw->l_rint) (chr, tp); 940 941 s = spltty(); /* really necessary? */ 942 if ((cy->cy_ibuf_rd_ptr += 2) == 943 cy->cy_ibuf_end) 944 cy->cy_ibuf_rd_ptr = cy->cy_ibuf; 945 splx(s); 946 947 #ifdef CY_DEBUG1 948 did_something = 1; 949 #endif 950 } 951 952 /* 953 * If we don't have any received data in ibuf and 954 * CRTSCTS is on and RTS is turned off, it is time to 955 * turn RTS back on 956 */ 957 if (ISSET(tp->t_cflag, CRTSCTS)) { 958 /* 959 * we can't use cy_modem_control() here as it 960 * doesn't change RTS if RTSCTS is on 961 */ 962 cd_write_reg(sc, cy->cy_chip, CD1400_CAR, 963 port & CD1400_CAR_CHAN); 964 965 if (cy->cy_clock == CY_CLOCK_60) { 966 if ((cd_read_reg(sc, cy->cy_chip, 967 CD1400_MSVR2) & CD1400_MSVR2_DTR) == 0) { 968 cd_write_reg(sc, cy->cy_chip, 969 CD1400_MSVR2,CD1400_MSVR2_DTR); 970 #ifdef CY_DEBUG1 971 did_something = 1; 972 #endif 973 } 974 } else { 975 if ((cd_read_reg(sc, cy->cy_chip, 976 CD1400_MSVR1) & CD1400_MSVR1_RTS) == 0) { 977 cd_write_reg(sc, cy->cy_chip, 978 CD1400_MSVR1,CD1400_MSVR1_RTS); 979 #ifdef CY_DEBUG1 980 did_something = 1; 981 #endif 982 } 983 } 984 } 985 986 /* 987 * handle carrier changes 988 */ 989 s = spltty(); 990 if (ISSET(cy->cy_flags, CY_F_CARRIER_CHANGED)) { 991 int carrier; 992 993 CLR(cy->cy_flags, CY_F_CARRIER_CHANGED); 994 splx(s); 995 996 carrier = ((cy->cy_carrier_stat & 997 CD1400_MSVR2_CD) != 0); 998 999 #ifdef CY_DEBUG 1000 printf("cy_poll: carrier change " 1001 "(card %d, port %d, carrier %d)\n", 1002 card, port, carrier); 1003 #endif 1004 if (CY_DIALOUT(tp->t_dev) == 0 && 1005 !(*tp->t_linesw->l_modem)(tp, carrier)) 1006 cy_modem_control(sc, cy, 1007 TIOCM_DTR, DMBIC); 1008 1009 #ifdef CY_DEBUG1 1010 did_something = 1; 1011 #endif 1012 } else 1013 splx(s); 1014 1015 s = spltty(); 1016 if (ISSET(cy->cy_flags, CY_F_START)) { 1017 CLR(cy->cy_flags, CY_F_START); 1018 splx(s); 1019 1020 (*tp->t_linesw->l_start) (tp); 1021 1022 #ifdef CY_DEBUG1 1023 did_something = 1; 1024 #endif 1025 } else 1026 splx(s); 1027 1028 /* could move this to even upper level... */ 1029 if (cy->cy_fifo_overruns) { 1030 cy->cy_fifo_overruns = 0; 1031 /* 1032 * doesn't report overrun count, but 1033 * shouldn't really matter 1034 */ 1035 log(LOG_WARNING, "%s: port %d fifo overrun\n", 1036 device_xname(sc->sc_dev), port); 1037 } 1038 if (cy->cy_ibuf_overruns) { 1039 cy->cy_ibuf_overruns = 0; 1040 log(LOG_WARNING, "%s: port %d ibuf overrun\n", 1041 device_xname(sc->sc_dev), port); 1042 } 1043 } /* for(port...) */ 1044 #ifdef CY_DEBUG1 1045 if (did_something && counter >= 200) 1046 sc->sc_poll_count2++; 1047 #endif 1048 } /* for(card...) */ 1049 1050 counter = 0; 1051 1052 out: 1053 callout_reset(&cy_poll_callout, 1, cy_poll, NULL); 1054 } 1055 1056 /* 1057 * hardware interrupt routine 1058 */ 1059 int 1060 cy_intr(void *arg) 1061 { 1062 struct cy_softc *sc = arg; 1063 struct cy_port *cy; 1064 int cy_chip, stat; 1065 int int_serviced = 0; 1066 1067 /* 1068 * Check interrupt status of each CD1400 chip on this card 1069 * (multiple cards cannot share the same interrupt) 1070 */ 1071 for (cy_chip = 0; cy_chip < sc->sc_nchips; cy_chip++) { 1072 1073 stat = cd_read_reg(sc, cy_chip, CD1400_SVRR); 1074 if (stat == 0) 1075 continue; 1076 1077 if (ISSET(stat, CD1400_SVRR_RXRDY)) { 1078 u_char save_car, save_rir, serv_type; 1079 u_char line_stat, recv_data, n_chars; 1080 u_char *buf_p; 1081 1082 save_rir = cd_read_reg(sc, cy_chip, CD1400_RIR); 1083 save_car = cd_read_reg(sc, cy_chip, CD1400_CAR); 1084 /* enter rx service */ 1085 cd_write_reg(sc, cy_chip, CD1400_CAR, save_rir); 1086 1087 serv_type = cd_read_reg(sc, cy_chip, CD1400_RIVR); 1088 cy = &sc->sc_ports[serv_type >> 3]; 1089 1090 #ifdef CY_DEBUG1 1091 cy->cy_rx_int_count++; 1092 #endif 1093 1094 buf_p = cy->cy_ibuf_wr_ptr; 1095 1096 if (ISSET(serv_type, CD1400_RIVR_EXCEPTION)) { 1097 line_stat = cd_read_reg(sc, cy->cy_chip, 1098 CD1400_RDSR); 1099 recv_data = cd_read_reg(sc, cy->cy_chip, 1100 CD1400_RDSR); 1101 1102 if (cy->cy_tty == NULL || 1103 !ISSET(cy->cy_tty->t_state, TS_ISOPEN)) 1104 goto end_rx_serv; 1105 1106 #ifdef CY_DEBUG 1107 aprint_debug_dev( 1108 sc->sc_dev, 1109 "port %d recv exception, " 1110 "line_stat 0x%x, char 0x%x\n", 1111 cy->cy_port_num, line_stat, recv_data); 1112 #endif 1113 if (ISSET(line_stat, CD1400_RDSR_OE)) 1114 cy->cy_fifo_overruns++; 1115 1116 *buf_p++ = line_stat; 1117 *buf_p++ = recv_data; 1118 if (buf_p == cy->cy_ibuf_end) 1119 buf_p = cy->cy_ibuf; 1120 1121 if (buf_p == cy->cy_ibuf_rd_ptr) { 1122 if (buf_p == cy->cy_ibuf) 1123 buf_p = cy->cy_ibuf_end; 1124 buf_p -= 2; 1125 cy->cy_ibuf_overruns++; 1126 } 1127 cy_events = 1; 1128 } else {/* no exception, received data OK */ 1129 n_chars = cd_read_reg(sc, cy->cy_chip, 1130 CD1400_RDCR); 1131 1132 /* If no tty or not open, discard data */ 1133 if (cy->cy_tty == NULL || 1134 !ISSET(cy->cy_tty->t_state, TS_ISOPEN)) { 1135 while (n_chars--) 1136 (void)cd_read_reg(sc, 1137 cy->cy_chip, CD1400_RDSR); 1138 goto end_rx_serv; 1139 } 1140 1141 #ifdef CY_DEBUG 1142 aprint_debug_dev(sc->sc_dev, 1143 "port %d receive ok %d chars\n", 1144 cy->cy_port_num, n_chars); 1145 #endif 1146 while (n_chars--) { 1147 *buf_p++ = 0; /* status: OK */ 1148 /* data byte */ 1149 *buf_p++ = cd_read_reg(sc, 1150 cy->cy_chip, CD1400_RDSR); 1151 if (buf_p == cy->cy_ibuf_end) 1152 buf_p = cy->cy_ibuf; 1153 if (buf_p == cy->cy_ibuf_rd_ptr) { 1154 if (buf_p == cy->cy_ibuf) 1155 buf_p = cy->cy_ibuf_end; 1156 buf_p -= 2; 1157 cy->cy_ibuf_overruns++; 1158 break; 1159 } 1160 } 1161 cy_events = 1; 1162 } 1163 1164 cy->cy_ibuf_wr_ptr = buf_p; 1165 1166 /* RTS handshaking for incoming data */ 1167 if (ISSET(cy->cy_tty->t_cflag, CRTSCTS)) { 1168 int bf, msvr; 1169 1170 bf = buf_p - cy->cy_ibuf_rd_ptr; 1171 if (bf < 0) 1172 bf += CY_IBUF_SIZE; 1173 1174 if (bf > (CY_IBUF_SIZE / 2)) { 1175 /* turn RTS off */ 1176 if (cy->cy_clock == CY_CLOCK_60) 1177 msvr = CD1400_MSVR2; 1178 else 1179 msvr = CD1400_MSVR1; 1180 cd_write_reg(sc, cy->cy_chip, msvr, 0); 1181 } 1182 } 1183 1184 end_rx_serv: 1185 /* terminate service context */ 1186 cd_write_reg(sc, cy->cy_chip, CD1400_RIR, 1187 save_rir & 0x3f); 1188 cd_write_reg(sc, cy->cy_chip, CD1400_CAR, save_car); 1189 int_serviced = 1; 1190 } /* if (rx_service...) */ 1191 if (ISSET(stat, CD1400_SVRR_MDMCH)) { 1192 u_char save_car, save_mir, serv_type, modem_stat; 1193 1194 save_mir = cd_read_reg(sc, cy_chip, CD1400_MIR); 1195 save_car = cd_read_reg(sc, cy_chip, CD1400_CAR); 1196 /* enter modem service */ 1197 cd_write_reg(sc, cy_chip, CD1400_CAR, save_mir); 1198 1199 serv_type = cd_read_reg(sc, cy_chip, CD1400_MIVR); 1200 cy = &sc->sc_ports[serv_type >> 3]; 1201 1202 #ifdef CY_DEBUG1 1203 cy->cy_modem_int_count++; 1204 #endif 1205 1206 modem_stat = cd_read_reg(sc, cy->cy_chip, CD1400_MSVR2); 1207 1208 #ifdef CY_DEBUG 1209 aprint_debug_dev(sc->sc_dev, 1210 "port %d modem line change, new stat 0x%x\n", 1211 cy->cy_port_num, modem_stat); 1212 #endif 1213 if (ISSET((cy->cy_carrier_stat ^ modem_stat), CD1400_MSVR2_CD)) { 1214 SET(cy->cy_flags, CY_F_CARRIER_CHANGED); 1215 cy_events = 1; 1216 } 1217 cy->cy_carrier_stat = modem_stat; 1218 1219 /* terminate service context */ 1220 cd_write_reg(sc, cy->cy_chip, CD1400_MIR, save_mir & 0x3f); 1221 cd_write_reg(sc, cy->cy_chip, CD1400_CAR, save_car); 1222 int_serviced = 1; 1223 } /* if (modem_service...) */ 1224 if (ISSET(stat, CD1400_SVRR_TXRDY)) { 1225 u_char save_car, save_tir, serv_type, 1226 count, ch; 1227 struct tty *tp; 1228 1229 save_tir = cd_read_reg(sc, cy_chip, CD1400_TIR); 1230 save_car = cd_read_reg(sc, cy_chip, CD1400_CAR); 1231 /* enter tx service */ 1232 cd_write_reg(sc, cy_chip, CD1400_CAR, save_tir); 1233 1234 serv_type = cd_read_reg(sc, cy_chip, CD1400_TIVR); 1235 cy = &sc->sc_ports[serv_type >> 3]; 1236 1237 #ifdef CY_DEBUG1 1238 cy->cy_tx_int_count++; 1239 #endif 1240 #ifdef CY_DEBUG 1241 aprint_debug_dev(sc->sc_dev, "port %d tx service\n", 1242 cy->cy_port_num); 1243 #endif 1244 1245 /* stop transmitting if no tty or CY_F_STOP set */ 1246 tp = cy->cy_tty; 1247 if (tp == NULL || ISSET(cy->cy_flags, CY_F_STOP)) 1248 goto txdone; 1249 1250 count = 0; 1251 if (ISSET(cy->cy_flags, CY_F_SEND_NUL)) { 1252 cd_write_reg(sc, cy->cy_chip, CD1400_TDR, 0); 1253 cd_write_reg(sc, cy->cy_chip, CD1400_TDR, 0); 1254 count += 2; 1255 CLR(cy->cy_flags, CY_F_SEND_NUL); 1256 } 1257 if (tp->t_outq.c_cc > 0) { 1258 SET(tp->t_state, TS_BUSY); 1259 while (tp->t_outq.c_cc > 0 && 1260 count < CD1400_TX_FIFO_SIZE) { 1261 ch = getc(&tp->t_outq); 1262 /* 1263 * remember to double NUL characters 1264 * because embedded transmit commands 1265 * are enabled 1266 */ 1267 if (ch == 0) { 1268 if (count >= CD1400_TX_FIFO_SIZE - 2) { 1269 SET(cy->cy_flags, CY_F_SEND_NUL); 1270 break; 1271 } 1272 cd_write_reg(sc, cy->cy_chip, 1273 CD1400_TDR, ch); 1274 count++; 1275 } 1276 cd_write_reg(sc, cy->cy_chip, 1277 CD1400_TDR, ch); 1278 count++; 1279 } 1280 } else { 1281 /* 1282 * no data to send -- check if we should 1283 * start/stop a break 1284 */ 1285 /* 1286 * XXX does this cause too much delay before 1287 * breaks? 1288 */ 1289 if (ISSET(cy->cy_flags, CY_F_START_BREAK)) { 1290 cd_write_reg(sc, cy->cy_chip, 1291 CD1400_TDR, 0); 1292 cd_write_reg(sc, cy->cy_chip, 1293 CD1400_TDR, 0x81); 1294 CLR(cy->cy_flags, CY_F_START_BREAK); 1295 } 1296 if (ISSET(cy->cy_flags, CY_F_END_BREAK)) { 1297 cd_write_reg(sc, cy->cy_chip, 1298 CD1400_TDR, 0); 1299 cd_write_reg(sc, cy->cy_chip, 1300 CD1400_TDR, 0x83); 1301 CLR(cy->cy_flags, CY_F_END_BREAK); 1302 } 1303 } 1304 1305 if (tp->t_outq.c_cc == 0) { 1306 txdone: 1307 /* 1308 * No data to send or requested to stop. 1309 * Disable transmit interrupt 1310 */ 1311 cd_write_reg(sc, cy->cy_chip, CD1400_SRER, 1312 cd_read_reg(sc, cy->cy_chip, CD1400_SRER) 1313 & ~CD1400_SRER_TXRDY); 1314 CLR(cy->cy_flags, CY_F_STOP); 1315 CLR(tp->t_state, TS_BUSY); 1316 } 1317 if (tp->t_outq.c_cc <= tp->t_lowat) { 1318 SET(cy->cy_flags, CY_F_START); 1319 cy_events = 1; 1320 } 1321 /* terminate service context */ 1322 cd_write_reg(sc, cy->cy_chip, CD1400_TIR, save_tir & 0x3f); 1323 cd_write_reg(sc, cy->cy_chip, CD1400_CAR, save_car); 1324 int_serviced = 1; 1325 } /* if (tx_service...) */ 1326 } /* for(...all CD1400s on a card) */ 1327 1328 /* ensure an edge for next interrupt */ 1329 bus_space_write_1(sc->sc_memt, sc->sc_bsh, 1330 CY_CLEAR_INTR << sc->sc_bustype, 0); 1331 return int_serviced; 1332 } 1333 1334 /* 1335 * subroutine to enable CD1400 transmitter 1336 */ 1337 void 1338 cy_enable_transmitter(struct cy_softc *sc, struct cy_port *cy) 1339 { 1340 int s = spltty(); 1341 cd_write_reg(sc, cy->cy_chip, CD1400_CAR, 1342 cy->cy_port_num & CD1400_CAR_CHAN); 1343 cd_write_reg(sc, cy->cy_chip, CD1400_SRER, 1344 cd_read_reg(sc, cy->cy_chip, CD1400_SRER) | CD1400_SRER_TXRDY); 1345 splx(s); 1346 } 1347 1348 /* 1349 * Execute a CD1400 channel command 1350 */ 1351 void 1352 cd1400_channel_cmd(struct cy_softc *sc, struct cy_port *cy, int cmd) 1353 { 1354 u_int waitcnt = 5 * 8 * 1024; /* approx 5 ms */ 1355 1356 #ifdef CY_DEBUG 1357 printf("c1400_channel_cmd cy %p command 0x%x\n", cy, cmd); 1358 #endif 1359 1360 /* wait until cd1400 is ready to process a new command */ 1361 while (cd_read_reg(sc, cy->cy_chip, CD1400_CCR) != 0 && waitcnt-- > 0); 1362 1363 if (waitcnt == 0) 1364 log(LOG_ERR, "%s: channel command timeout\n", 1365 device_xname(sc->sc_dev)); 1366 1367 cd_write_reg(sc, cy->cy_chip, CD1400_CCR, cmd); 1368 } 1369 1370 /* 1371 * Compute clock option register and baud rate register values 1372 * for a given speed. Return 0 on success, -1 on failure. 1373 * 1374 * The error between requested and actual speed seems 1375 * to be well within allowed limits (less than 3%) 1376 * with every speed value between 50 and 150000 bps. 1377 */ 1378 int 1379 cy_speed(speed_t speed, int *cor, int *bpr, int cy_clock) 1380 { 1381 int c, co, br; 1382 1383 if (speed < 50 || speed > 150000) 1384 return -1; 1385 1386 for (c = 0, co = 8; co <= 2048; co <<= 2, c++) { 1387 br = (cy_clock + (co * speed) / 2) / (co * speed); 1388 if (br < 0x100) { 1389 *bpr = br; 1390 *cor = c; 1391 return 0; 1392 } 1393 } 1394 1395 return -1; 1396 }
Cache object: 2650c10873185849d8a44df929fcef05
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