scif.c revision 1.58
1 /* $NetBSD: scif.c,v 1.58 2009/03/18 10:22:36 cegger Exp $ */ 2 3 /*- 4 * Copyright (C) 1999 T.Horiuchi and SAITOH Masanobu. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 /*- 30 * Copyright (c) 1998, 1999 The NetBSD Foundation, Inc. 31 * All rights reserved. 32 * 33 * This code is derived from software contributed to The NetBSD Foundation 34 * by Charles M. Hannum. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 45 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 46 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 47 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 48 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 49 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 50 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 51 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 52 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 53 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 54 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 55 * POSSIBILITY OF SUCH DAMAGE. 56 */ 57 58 /* 59 * Copyright (c) 1991 The Regents of the University of California. 60 * All rights reserved. 61 * 62 * Redistribution and use in source and binary forms, with or without 63 * modification, are permitted provided that the following conditions 64 * are met: 65 * 1. Redistributions of source code must retain the above copyright 66 * notice, this list of conditions and the following disclaimer. 67 * 2. Redistributions in binary form must reproduce the above copyright 68 * notice, this list of conditions and the following disclaimer in the 69 * documentation and/or other materials provided with the distribution. 70 * 3. Neither the name of the University nor the names of its contributors 71 * may be used to endorse or promote products derived from this software 72 * without specific prior written permission. 73 * 74 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 75 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 76 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 77 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 78 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 79 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 80 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 81 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 82 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 83 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 84 * SUCH DAMAGE. 85 * 86 * @(#)com.c 7.5 (Berkeley) 5/16/91 87 */ 88 89 /* 90 * SH internal serial driver 91 * 92 * This code is derived from both z8530tty.c and com.c 93 */ 94 95 #include <sys/cdefs.h> 96 __KERNEL_RCSID(0, "$NetBSD: scif.c,v 1.58 2009/03/18 10:22:36 cegger Exp $"); 97 98 #include "opt_kgdb.h" 99 #include "opt_scif.h" 100 101 #include <sys/param.h> 102 #include <sys/systm.h> 103 #include <sys/tty.h> 104 #include <sys/proc.h> 105 #include <sys/conf.h> 106 #include <sys/file.h> 107 #include <sys/syslog.h> 108 #include <sys/kernel.h> 109 #include <sys/device.h> 110 #include <sys/malloc.h> 111 #include <sys/kgdb.h> 112 #include <sys/kauth.h> 113 #include <sys/intr.h> 114 115 #include <dev/cons.h> 116 117 #include <sh3/clock.h> 118 #include <sh3/exception.h> 119 #include <sh3/scifreg.h> 120 121 #include <sh3/dev/scifvar.h> 122 123 #include "locators.h" 124 125 126 struct scif_softc { 127 device_t sc_dev; 128 129 struct tty *sc_tty; 130 void *sc_si; 131 132 callout_t sc_diag_ch; 133 134 #if 0 135 bus_space_tag_t sc_iot; /* ISA i/o space identifier */ 136 bus_space_handle_t sc_ioh; /* ISA io handle */ 137 138 int sc_drq; 139 140 int sc_frequency; 141 #endif 142 143 u_int sc_overflows, 144 sc_floods, 145 sc_errors; /* number of retries so far */ 146 u_char sc_status[7]; /* copy of registers */ 147 148 int sc_hwflags; 149 int sc_swflags; 150 u_int sc_fifolen; 151 152 u_int sc_r_hiwat, 153 sc_r_lowat; 154 u_char *volatile sc_rbget, 155 *volatile sc_rbput; 156 volatile u_int sc_rbavail; 157 u_char *sc_rbuf, 158 *sc_ebuf; 159 160 u_char *sc_tba; /* transmit buffer address */ 161 u_int sc_tbc, /* transmit byte count */ 162 sc_heldtbc; 163 164 volatile u_char sc_rx_flags, 165 #define RX_TTY_BLOCKED 0x01 166 #define RX_TTY_OVERFLOWED 0x02 167 #define RX_IBUF_BLOCKED 0x04 168 #define RX_IBUF_OVERFLOWED 0x08 169 #define RX_ANY_BLOCK 0x0f 170 sc_tx_busy, /* working on an output chunk */ 171 sc_tx_done, /* done with one output chunk */ 172 sc_tx_stopped, /* H/W level stop (lost CTS) */ 173 sc_st_check, /* got a status interrupt */ 174 sc_rx_ready; 175 176 volatile u_char sc_heldchange; 177 }; 178 179 180 static int scif_match(device_t, cfdata_t, void *); 181 static void scif_attach(device_t, device_t, void *); 182 183 CFATTACH_DECL_NEW(scif, sizeof(struct scif_softc), 184 scif_match, scif_attach, NULL, NULL); 185 186 static int scif_attached = 0; /* XXX: FIXME: don't limit to just one! */ 187 188 extern struct cfdriver scif_cd; 189 190 #define SCIFUNIT_MASK 0x7ffff 191 #define SCIFDIALOUT_MASK 0x80000 192 193 #define SCIFUNIT(x) (minor(x) & SCIFUNIT_MASK) 194 #define SCIFDIALOUT(x) (minor(x) & SCIFDIALOUT_MASK) 195 196 197 /* console */ 198 dev_type_cnprobe(scifcnprobe); 199 dev_type_cninit(scifcninit); 200 dev_type_cngetc(scifcngetc); 201 dev_type_cnputc(scifcnputc); 202 203 204 /* cdevsw */ 205 dev_type_open(scifopen); 206 dev_type_close(scifclose); 207 dev_type_read(scifread); 208 dev_type_write(scifwrite); 209 dev_type_ioctl(scifioctl); 210 dev_type_stop(scifstop); 211 dev_type_tty(sciftty); 212 dev_type_poll(scifpoll); 213 214 const struct cdevsw scif_cdevsw = { 215 scifopen, scifclose, scifread, scifwrite, scifioctl, 216 scifstop, sciftty, scifpoll, nommap, ttykqfilter, D_TTY 217 }; 218 219 220 /* struct tty */ 221 static void scifstart(struct tty *); 222 static int scifparam(struct tty *, struct termios *); 223 224 225 void InitializeScif (unsigned int); 226 int ScifErrCheck(void); 227 void scif_putc(unsigned char); 228 unsigned char scif_getc(void); 229 230 static int scifintr(void *); 231 static void scifsoft(void *); 232 static void scif_rxsoft(struct scif_softc *, struct tty *); 233 static void scif_txsoft(struct scif_softc *, struct tty *); 234 #if 0 235 static void scif_stsoft(struct scif_softc *, struct tty *); 236 #endif 237 static void scif_schedrx(struct scif_softc *); 238 static void scifdiag(void *); 239 240 static void scif_break(struct scif_softc *, int); 241 static void scif_iflush(struct scif_softc *); 242 243 244 /* Hardware flag masks (sc_hwflags) */ 245 #define SCIF_HW_NOIEN 0x01 246 #define SCIF_HW_FIFO 0x02 247 #define SCIF_HW_FLOW 0x08 248 #define SCIF_HW_DEV_OK 0x20 249 #define SCIF_HW_CONSOLE 0x40 250 #define SCIF_HW_KGDB 0x80 251 252 253 /* Buffer size for character buffer */ 254 #define SCIF_RING_SIZE 2048 255 static unsigned int scif_rbuf_size = SCIF_RING_SIZE; 256 257 /* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 258 static unsigned int scif_rbuf_hiwat = (SCIF_RING_SIZE * 1) / 4; 259 static unsigned int scif_rbuf_lowat = (SCIF_RING_SIZE * 3) / 4; 260 261 262 #ifdef SCIFCN_SPEED 263 unsigned int scifcn_speed = SCIFCN_SPEED; 264 #else 265 unsigned int scifcn_speed = 9600; 266 #endif 267 268 #define CONMODE ((TTYDEF_CFLAG & ~(CSIZE | CSTOPB | PARENB)) | CS8) /* 8N1 */ 269 int scifconscflag = CONMODE; 270 271 static int scifisconsole = 0; 272 273 #ifdef KGDB 274 static int kgdb_attached = 0; 275 #endif 276 277 278 #define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */ 279 280 281 /* XXX: uwe 282 * Prepare for bus_spacification. The difference in access widths is 283 * still handled by the magic definitions in scifreg.h 284 */ 285 #define scif_smr_read() SHREG_SCSMR2 286 #define scif_smr_write(v) (SHREG_SCSMR2 = (v)) 287 288 #define scif_brr_read() SHREG_SCBRR2 289 #define scif_brr_write(v) (SHREG_SCBRR2 = (v)) 290 291 #define scif_scr_read() SHREG_SCSCR2 292 #define scif_scr_write(v) (SHREG_SCSCR2 = (v)) 293 294 #define scif_ftdr_write(v) (SHREG_SCFTDR2 = (v)) 295 296 #define scif_ssr_read() SHREG_SCSSR2 297 #define scif_ssr_write(v) (SHREG_SCSSR2 = (v)) 298 299 #define scif_frdr_read() SHREG_SCFRDR2 300 301 #define scif_fcr_read() SHREG_SCFCR2 302 #define scif_fcr_write(v) (SHREG_SCFCR2 = (v)) 303 304 #define scif_fdr_read() SHREG_SCFDR2 305 306 #ifdef SH4 /* additional registers in sh4 */ 307 308 #define scif_sptr_read() SHREG_SCSPTR2 309 #define scif_sptr_write(v) (SHREG_SCSPTR2 = (v)) 310 311 #define scif_lsr_read() SHREG_SCLSR2 312 #define scif_lsr_write(v) (SHREG_SCLSR2 = (v)) 313 314 #endif /* SH4 */ 315 316 317 void 318 InitializeScif(unsigned int bps) 319 { 320 321 /* Initialize SCR */ 322 scif_scr_write(0x00); 323 324 #if 0 325 scif_fcr_write(SCFCR2_TFRST | SCFCR2_RFRST | SCFCR2_MCE); 326 #else 327 scif_fcr_write(SCFCR2_TFRST | SCFCR2_RFRST); 328 #endif 329 /* Serial Mode Register */ 330 scif_smr_write(0x00); /* 8bit,NonParity,Even,1Stop */ 331 332 /* Bit Rate Register */ 333 scif_brr_write(divrnd(sh_clock_get_pclock(), 32 * bps) - 1); 334 335 /* 336 * wait 2m Sec, because Send/Recv must begin 1 bit period after 337 * BRR is set. 338 */ 339 delay(2000); 340 341 #if 0 342 scif_fcr_write(FIFO_RCV_TRIGGER_14 | FIFO_XMT_TRIGGER_1 | SCFCR2_MCE); 343 #else 344 scif_fcr_write(FIFO_RCV_TRIGGER_14 | FIFO_XMT_TRIGGER_1); 345 #endif 346 347 /* Send permission, Receive permission ON */ 348 scif_scr_write(SCSCR2_TE | SCSCR2_RE); 349 350 /* Serial Status Register */ 351 scif_ssr_write(scif_ssr_read() & SCSSR2_TDFE); /* Clear Status */ 352 } 353 354 int 355 ScifErrCheck(void) 356 { 357 358 return (scif_ssr_read() & (SCSSR2_ER | SCSSR2_FER | SCSSR2_PER)); 359 } 360 361 void 362 scif_putc(unsigned char c) 363 { 364 365 /* wait for ready */ 366 while ((scif_fdr_read() & SCFDR2_TXCNT) == SCFDR2_TXF_FULL) 367 continue; 368 369 /* write send data to send register */ 370 scif_ftdr_write(c); 371 372 /* clear ready flag */ 373 scif_ssr_write(scif_ssr_read() & ~(SCSSR2_TDFE | SCSSR2_TEND)); 374 } 375 376 unsigned char 377 scif_getc(void) 378 { 379 unsigned char c, err_c; 380 #ifdef SH4 381 unsigned short err_c2 = 0; /* XXXGCC: -Wuninitialized */ 382 #endif 383 384 for (;;) { 385 /* wait for ready */ 386 while ((scif_fdr_read() & SCFDR2_RECVCNT) == 0) 387 continue; 388 389 c = scif_frdr_read(); 390 err_c = scif_ssr_read(); 391 scif_ssr_write(scif_ssr_read() 392 & ~(SCSSR2_ER | SCSSR2_BRK | SCSSR2_RDF | SCSSR2_DR)); 393 #ifdef SH4 394 if (CPU_IS_SH4) { 395 err_c2 = scif_lsr_read(); 396 scif_lsr_write(scif_lsr_read() & ~SCLSR2_ORER); 397 } 398 #endif 399 if ((err_c & (SCSSR2_ER | SCSSR2_BRK | SCSSR2_FER 400 | SCSSR2_PER)) == 0) 401 { 402 #ifdef SH4 403 if (CPU_IS_SH4 && ((err_c2 & SCLSR2_ORER) == 0)) 404 #endif 405 return(c); 406 } 407 } 408 409 } 410 411 static int 412 scif_match(device_t parent, cfdata_t cfp, void *aux) 413 { 414 415 if (scif_attached) 416 return 0; 417 418 if (strcmp(cfp->cf_name, "scif") != 0) 419 return 0; 420 421 return 1; 422 } 423 424 static void 425 scif_attach(device_t parent, device_t self, void *aux) 426 { 427 struct scif_softc *sc; 428 struct tty *tp; 429 430 sc = device_private(self); 431 sc->sc_dev = self; 432 433 scif_attached = 1; 434 435 sc->sc_hwflags = 0; /* XXX */ 436 sc->sc_swflags = 0; /* XXX */ 437 sc->sc_fifolen = 16; 438 439 aprint_normal("\n"); 440 if (scifisconsole) { 441 aprint_naive(" (console)\n"); 442 aprint_normal_dev(self, "console\n"); 443 SET(sc->sc_hwflags, SCIF_HW_CONSOLE); 444 SET(sc->sc_swflags, TIOCFLAG_SOFTCAR); 445 } 446 #ifdef KGDB 447 else if (kgdb_attached) { 448 aprint_naive(" (kgdb)\n"); 449 aprint_normal_dev(self, "kgdb\n"); 450 SET(sc->sc_hwflags, SCIF_HW_KGDB); 451 SET(sc->sc_swflags, TIOCFLAG_SOFTCAR); 452 } 453 #endif 454 else { 455 aprint_naive("\n"); 456 InitializeScif(9600); /* XXX */ 457 } 458 459 callout_init(&sc->sc_diag_ch, 0); 460 #ifdef SH4 461 intc_intr_establish(SH4_INTEVT_SCIF_ERI, IST_LEVEL, IPL_SERIAL, 462 scifintr, sc); 463 intc_intr_establish(SH4_INTEVT_SCIF_RXI, IST_LEVEL, IPL_SERIAL, 464 scifintr, sc); 465 intc_intr_establish(SH4_INTEVT_SCIF_BRI, IST_LEVEL, IPL_SERIAL, 466 scifintr, sc); 467 intc_intr_establish(SH4_INTEVT_SCIF_TXI, IST_LEVEL, IPL_SERIAL, 468 scifintr, sc); 469 #else 470 intc_intr_establish(SH7709_INTEVT2_SCIF_ERI, IST_LEVEL, IPL_SERIAL, 471 scifintr, sc); 472 intc_intr_establish(SH7709_INTEVT2_SCIF_RXI, IST_LEVEL, IPL_SERIAL, 473 scifintr, sc); 474 intc_intr_establish(SH7709_INTEVT2_SCIF_BRI, IST_LEVEL, IPL_SERIAL, 475 scifintr, sc); 476 intc_intr_establish(SH7709_INTEVT2_SCIF_TXI, IST_LEVEL, IPL_SERIAL, 477 scifintr, sc); 478 #endif 479 480 sc->sc_si = softint_establish(SOFTINT_SERIAL, scifsoft, sc); 481 SET(sc->sc_hwflags, SCIF_HW_DEV_OK); 482 483 tp = ttymalloc(); 484 tp->t_oproc = scifstart; 485 tp->t_param = scifparam; 486 tp->t_hwiflow = NULL; 487 488 sc->sc_tty = tp; 489 sc->sc_rbuf = malloc(scif_rbuf_size << 1, M_DEVBUF, M_NOWAIT); 490 if (sc->sc_rbuf == NULL) { 491 aprint_error_dev(self, "unable to allocate ring buffer\n"); 492 return; 493 } 494 sc->sc_ebuf = sc->sc_rbuf + (scif_rbuf_size << 1); 495 496 tty_attach(tp); 497 } 498 499 /* 500 * Start or restart transmission. 501 */ 502 static void 503 scifstart(struct tty *tp) 504 { 505 struct scif_softc *sc; 506 int s; 507 508 sc = device_lookup_private(&scif_cd, SCIFUNIT(tp->t_dev)); 509 510 s = spltty(); 511 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 512 goto out; 513 if (sc->sc_tx_stopped) 514 goto out; 515 if (!ttypull(tp)) 516 goto out; 517 518 /* Grab the first contiguous region of buffer space. */ 519 { 520 u_char *tba; 521 int tbc; 522 523 tba = tp->t_outq.c_cf; 524 tbc = ndqb(&tp->t_outq, 0); 525 526 (void)splserial(); 527 528 sc->sc_tba = tba; 529 sc->sc_tbc = tbc; 530 } 531 532 SET(tp->t_state, TS_BUSY); 533 sc->sc_tx_busy = 1; 534 535 /* Enable transmit completion interrupts if necessary. */ 536 scif_scr_write(scif_scr_read() | SCSCR2_TIE | SCSCR2_RIE); 537 538 /* Output the first chunk of the contiguous buffer. */ 539 { 540 int n; 541 int maxchars; 542 int i; 543 544 n = sc->sc_tbc; 545 maxchars = sc->sc_fifolen 546 - ((scif_fdr_read() & SCFDR2_TXCNT) >> 8); 547 if (n > maxchars) 548 n = maxchars; 549 550 for (i = 0; i < n; i++) { 551 scif_putc(*(sc->sc_tba)); 552 sc->sc_tba++; 553 } 554 sc->sc_tbc -= n; 555 } 556 out: 557 splx(s); 558 return; 559 } 560 561 /* 562 * Set SCIF tty parameters from termios. 563 * XXX - Should just copy the whole termios after 564 * making sure all the changes could be done. 565 */ 566 static int 567 scifparam(struct tty *tp, struct termios *t) 568 { 569 struct scif_softc *sc; 570 int ospeed = t->c_ospeed; 571 int s; 572 573 sc = device_lookup_private(&scif_cd, SCIFUNIT(tp->t_dev)); 574 if (!device_is_active(sc->sc_dev)) 575 return (EIO); 576 577 /* Check requested parameters. */ 578 if (ospeed < 0) 579 return (EINVAL); 580 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 581 return (EINVAL); 582 583 /* 584 * For the console, always force CLOCAL and !HUPCL, so that the port 585 * is always active. 586 */ 587 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) || 588 ISSET(sc->sc_hwflags, SCIF_HW_CONSOLE)) { 589 SET(t->c_cflag, CLOCAL); 590 CLR(t->c_cflag, HUPCL); 591 } 592 593 /* 594 * If there were no changes, don't do anything. This avoids dropping 595 * input and improves performance when all we did was frob things like 596 * VMIN and VTIME. 597 */ 598 if (tp->t_ospeed == t->c_ospeed && 599 tp->t_cflag == t->c_cflag) 600 return (0); 601 602 #if 0 603 /* XXX (msaitoh) */ 604 lcr = ISSET(sc->sc_lcr, LCR_SBREAK) | cflag2lcr(t->c_cflag); 605 #endif 606 607 s = splserial(); 608 609 /* 610 * Set the flow control pins depending on the current flow control 611 * mode. 612 */ 613 if (ISSET(t->c_cflag, CRTSCTS)) { 614 scif_fcr_write(scif_fcr_read() | SCFCR2_MCE); 615 } else { 616 scif_fcr_write(scif_fcr_read() & ~SCFCR2_MCE); 617 } 618 619 scif_brr_write(divrnd(sh_clock_get_pclock(), 32 * ospeed) -1); 620 621 /* 622 * Set the FIFO threshold based on the receive speed. 623 * 624 * * If it's a low speed, it's probably a mouse or some other 625 * interactive device, so set the threshold low. 626 * * If it's a high speed, trim the trigger level down to prevent 627 * overflows. 628 * * Otherwise set it a bit higher. 629 */ 630 #if 0 631 /* XXX (msaitoh) */ 632 if (ISSET(sc->sc_hwflags, SCIF_HW_HAYESP)) 633 sc->sc_fifo = FIFO_DMA_MODE | FIFO_ENABLE | FIFO_TRIGGER_8; 634 else if (ISSET(sc->sc_hwflags, SCIF_HW_FIFO)) 635 sc->sc_fifo = FIFO_ENABLE | 636 (t->c_ospeed <= 1200 ? FIFO_TRIGGER_1 : 637 t->c_ospeed <= 38400 ? FIFO_TRIGGER_8 : FIFO_TRIGGER_4); 638 else 639 sc->sc_fifo = 0; 640 #endif 641 642 /* And copy to tty. */ 643 tp->t_ispeed = 0; 644 tp->t_ospeed = t->c_ospeed; 645 tp->t_cflag = t->c_cflag; 646 647 if (!sc->sc_heldchange) { 648 if (sc->sc_tx_busy) { 649 sc->sc_heldtbc = sc->sc_tbc; 650 sc->sc_tbc = 0; 651 sc->sc_heldchange = 1; 652 } 653 #if 0 654 /* XXX (msaitoh) */ 655 else 656 scif_loadchannelregs(sc); 657 #endif 658 } 659 660 if (!ISSET(t->c_cflag, CHWFLOW)) { 661 /* Disable the high water mark. */ 662 sc->sc_r_hiwat = 0; 663 sc->sc_r_lowat = 0; 664 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 665 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 666 scif_schedrx(sc); 667 } 668 } else { 669 sc->sc_r_hiwat = scif_rbuf_hiwat; 670 sc->sc_r_lowat = scif_rbuf_lowat; 671 } 672 673 splx(s); 674 675 #ifdef SCIF_DEBUG 676 if (scif_debug) 677 scifstatus(sc, "scifparam "); 678 #endif 679 680 if (!ISSET(t->c_cflag, CHWFLOW)) { 681 if (sc->sc_tx_stopped) { 682 sc->sc_tx_stopped = 0; 683 scifstart(tp); 684 } 685 } 686 687 return (0); 688 } 689 690 static void 691 scif_iflush(struct scif_softc *sc) 692 { 693 int i; 694 unsigned char c; 695 696 i = scif_fdr_read() & SCFDR2_RECVCNT; 697 698 while (i > 0) { 699 c = scif_frdr_read(); 700 scif_ssr_write(scif_ssr_read() & ~(SCSSR2_RDF | SCSSR2_DR)); 701 i--; 702 } 703 } 704 705 int 706 scifopen(dev_t dev, int flag, int mode, struct lwp *l) 707 { 708 struct scif_softc *sc; 709 struct tty *tp; 710 int s, s2; 711 int error; 712 713 sc = device_lookup_private(&scif_cd, SCIFUNIT(dev)); 714 if (sc == 0 || !ISSET(sc->sc_hwflags, SCIF_HW_DEV_OK) || 715 sc->sc_rbuf == NULL) 716 return (ENXIO); 717 718 if (!device_is_active(sc->sc_dev)) 719 return (ENXIO); 720 721 #ifdef KGDB 722 /* 723 * If this is the kgdb port, no other use is permitted. 724 */ 725 if (ISSET(sc->sc_hwflags, SCIF_HW_KGDB)) 726 return (EBUSY); 727 #endif /* KGDB */ 728 729 tp = sc->sc_tty; 730 731 if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp)) 732 return (EBUSY); 733 734 s = spltty(); 735 736 /* 737 * Do the following iff this is a first open. 738 */ 739 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 740 struct termios t; 741 742 tp->t_dev = dev; 743 744 s2 = splserial(); 745 746 /* Turn on interrupts. */ 747 scif_scr_write(scif_scr_read() | SCSCR2_TIE | SCSCR2_RIE); 748 749 splx(s2); 750 751 /* 752 * Initialize the termios status to the defaults. Add in the 753 * sticky bits from TIOCSFLAGS. 754 */ 755 t.c_ispeed = 0; 756 if (ISSET(sc->sc_hwflags, SCIF_HW_CONSOLE)) { 757 t.c_ospeed = scifcn_speed; /* XXX (msaitoh) */ 758 t.c_cflag = scifconscflag; 759 } else { 760 t.c_ospeed = TTYDEF_SPEED; 761 t.c_cflag = TTYDEF_CFLAG; 762 } 763 if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL)) 764 SET(t.c_cflag, CLOCAL); 765 if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)) 766 SET(t.c_cflag, CRTSCTS); 767 if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF)) 768 SET(t.c_cflag, MDMBUF); 769 /* Make sure scifparam() will do something. */ 770 tp->t_ospeed = 0; 771 (void) scifparam(tp, &t); 772 tp->t_iflag = TTYDEF_IFLAG; 773 tp->t_oflag = TTYDEF_OFLAG; 774 tp->t_lflag = TTYDEF_LFLAG; 775 ttychars(tp); 776 ttsetwater(tp); 777 778 s2 = splserial(); 779 780 /* Clear the input ring, and unblock. */ 781 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 782 sc->sc_rbavail = scif_rbuf_size; 783 scif_iflush(sc); 784 CLR(sc->sc_rx_flags, RX_ANY_BLOCK); 785 #if 0 786 /* XXX (msaitoh) */ 787 scif_hwiflow(sc); 788 #endif 789 790 #ifdef SCIF_DEBUG 791 if (scif_debug) 792 scifstatus(sc, "scifopen "); 793 #endif 794 795 splx(s2); 796 } 797 798 splx(s); 799 800 error = ttyopen(tp, SCIFDIALOUT(dev), ISSET(flag, O_NONBLOCK)); 801 if (error) 802 goto bad; 803 804 error = (*tp->t_linesw->l_open)(dev, tp); 805 if (error) 806 goto bad; 807 808 return (0); 809 810 bad: 811 812 return (error); 813 } 814 815 int 816 scifclose(dev_t dev, int flag, int mode, struct lwp *l) 817 { 818 struct scif_softc *sc; 819 struct tty *tp; 820 821 sc = device_lookup_private(&scif_cd, SCIFUNIT(dev)); 822 tp = sc->sc_tty; 823 824 /* XXX This is for cons.c. */ 825 if (!ISSET(tp->t_state, TS_ISOPEN)) 826 return (0); 827 828 (*tp->t_linesw->l_close)(tp, flag); 829 ttyclose(tp); 830 831 if (!device_is_active(sc->sc_dev)) 832 return (0); 833 834 return (0); 835 } 836 837 int 838 scifread(dev_t dev, struct uio *uio, int flag) 839 { 840 struct scif_softc *sc; 841 struct tty *tp; 842 843 sc = device_lookup_private(&scif_cd, SCIFUNIT(dev)); 844 tp = sc->sc_tty; 845 846 return ((*tp->t_linesw->l_read)(tp, uio, flag)); 847 } 848 849 int 850 scifwrite(dev_t dev, struct uio *uio, int flag) 851 { 852 struct scif_softc *sc; 853 struct tty *tp; 854 855 sc = device_lookup_private(&scif_cd, SCIFUNIT(dev)); 856 tp = sc->sc_tty; 857 858 return ((*tp->t_linesw->l_write)(tp, uio, flag)); 859 } 860 861 int 862 scifpoll(dev_t dev, int events, struct lwp *l) 863 { 864 struct scif_softc *sc; 865 struct tty *tp; 866 867 sc = device_lookup_private(&scif_cd, SCIFUNIT(dev)); 868 tp = sc->sc_tty; 869 870 return ((*tp->t_linesw->l_poll)(tp, events, l)); 871 } 872 873 struct tty * 874 sciftty(dev_t dev) 875 { 876 struct scif_softc *sc; 877 struct tty *tp; 878 879 sc = device_lookup_private(&scif_cd, SCIFUNIT(dev)); 880 tp = sc->sc_tty; 881 882 return (tp); 883 } 884 885 int 886 scifioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 887 { 888 struct scif_softc *sc; 889 struct tty *tp; 890 int error; 891 int s; 892 893 sc = device_lookup_private(&scif_cd, SCIFUNIT(dev)); 894 if (!device_is_active(sc->sc_dev)) 895 return (EIO); 896 897 tp = sc->sc_tty; 898 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 899 if (error != EPASSTHROUGH) 900 return (error); 901 902 error = ttioctl(tp, cmd, data, flag, l); 903 if (error != EPASSTHROUGH) 904 return (error); 905 906 error = 0; 907 908 s = splserial(); 909 910 switch (cmd) { 911 case TIOCSBRK: 912 scif_break(sc, 1); 913 break; 914 915 case TIOCCBRK: 916 scif_break(sc, 0); 917 break; 918 919 case TIOCGFLAGS: 920 *(int *)data = sc->sc_swflags; 921 break; 922 923 case TIOCSFLAGS: 924 error = kauth_authorize_device_tty(l->l_cred, 925 KAUTH_DEVICE_TTY_PRIVSET, tp); 926 if (error) 927 break; 928 sc->sc_swflags = *(int *)data; 929 break; 930 931 default: 932 error = EPASSTHROUGH; 933 break; 934 } 935 936 splx(s); 937 938 return (error); 939 } 940 941 static void 942 scif_schedrx(struct scif_softc *sc) 943 { 944 945 sc->sc_rx_ready = 1; 946 947 /* Wake up the poller. */ 948 softint_schedule(sc->sc_si); 949 } 950 951 static void 952 scif_break(struct scif_softc *sc, int onoff) 953 { 954 955 if (onoff) 956 scif_ssr_write(scif_ssr_read() & ~SCSSR2_TDFE); 957 else 958 scif_ssr_write(scif_ssr_read() | SCSSR2_TDFE); 959 960 #if 0 /* XXX */ 961 if (!sc->sc_heldchange) { 962 if (sc->sc_tx_busy) { 963 sc->sc_heldtbc = sc->sc_tbc; 964 sc->sc_tbc = 0; 965 sc->sc_heldchange = 1; 966 } else 967 scif_loadchannelregs(sc); 968 } 969 #endif 970 } 971 972 /* 973 * Stop output, e.g., for ^S or output flush. 974 */ 975 void 976 scifstop(struct tty *tp, int flag) 977 { 978 struct scif_softc *sc; 979 int s; 980 981 sc = device_lookup_private(&scif_cd, SCIFUNIT(tp->t_dev)); 982 983 s = splserial(); 984 if (ISSET(tp->t_state, TS_BUSY)) { 985 /* Stop transmitting at the next chunk. */ 986 sc->sc_tbc = 0; 987 sc->sc_heldtbc = 0; 988 if (!ISSET(tp->t_state, TS_TTSTOP)) 989 SET(tp->t_state, TS_FLUSH); 990 } 991 splx(s); 992 } 993 994 static void 995 scifdiag(void *arg) 996 { 997 struct scif_softc *sc = arg; 998 int overflows, floods; 999 int s; 1000 1001 s = splserial(); 1002 overflows = sc->sc_overflows; 1003 sc->sc_overflows = 0; 1004 floods = sc->sc_floods; 1005 sc->sc_floods = 0; 1006 sc->sc_errors = 0; 1007 splx(s); 1008 1009 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1010 device_xname(sc->sc_dev), 1011 overflows, overflows == 1 ? "" : "s", 1012 floods, floods == 1 ? "" : "s"); 1013 } 1014 1015 static void 1016 scif_rxsoft(struct scif_softc *sc, struct tty *tp) 1017 { 1018 int (*rint)(int, struct tty *) = tp->t_linesw->l_rint; 1019 u_char *get, *end; 1020 u_int cc, scc; 1021 u_char ssr2; 1022 int code; 1023 int s; 1024 1025 end = sc->sc_ebuf; 1026 get = sc->sc_rbget; 1027 scc = cc = scif_rbuf_size - sc->sc_rbavail; 1028 1029 if (cc == scif_rbuf_size) { 1030 sc->sc_floods++; 1031 if (sc->sc_errors++ == 0) 1032 callout_reset(&sc->sc_diag_ch, 60 * hz, scifdiag, sc); 1033 } 1034 1035 while (cc) { 1036 code = get[0]; 1037 ssr2 = get[1]; 1038 if (ISSET(ssr2, SCSSR2_BRK | SCSSR2_FER | SCSSR2_PER)) { 1039 if (ISSET(ssr2, SCSSR2_BRK | SCSSR2_FER)) 1040 SET(code, TTY_FE); 1041 if (ISSET(ssr2, SCSSR2_PER)) 1042 SET(code, TTY_PE); 1043 } 1044 if ((*rint)(code, tp) == -1) { 1045 /* 1046 * The line discipline's buffer is out of space. 1047 */ 1048 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1049 /* 1050 * We're either not using flow control, or the 1051 * line discipline didn't tell us to block for 1052 * some reason. Either way, we have no way to 1053 * know when there's more space available, so 1054 * just drop the rest of the data. 1055 */ 1056 get += cc << 1; 1057 if (get >= end) 1058 get -= scif_rbuf_size << 1; 1059 cc = 0; 1060 } else { 1061 /* 1062 * Don't schedule any more receive processing 1063 * until the line discipline tells us there's 1064 * space available (through scifhwiflow()). 1065 * Leave the rest of the data in the input 1066 * buffer. 1067 */ 1068 SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1069 } 1070 break; 1071 } 1072 get += 2; 1073 if (get >= end) 1074 get = sc->sc_rbuf; 1075 cc--; 1076 } 1077 1078 if (cc != scc) { 1079 sc->sc_rbget = get; 1080 s = splserial(); 1081 cc = sc->sc_rbavail += scc - cc; 1082 /* Buffers should be ok again, release possible block. */ 1083 if (cc >= sc->sc_r_lowat) { 1084 if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1085 CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1086 scif_scr_write(scif_scr_read() | SCSCR2_RIE); 1087 } 1088 #if 0 1089 if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) { 1090 CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1091 scif_hwiflow(sc); 1092 } 1093 #endif 1094 } 1095 splx(s); 1096 } 1097 } 1098 1099 static void 1100 scif_txsoft(struct scif_softc *sc, struct tty *tp) 1101 { 1102 1103 CLR(tp->t_state, TS_BUSY); 1104 if (ISSET(tp->t_state, TS_FLUSH)) 1105 CLR(tp->t_state, TS_FLUSH); 1106 else 1107 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf)); 1108 (*tp->t_linesw->l_start)(tp); 1109 } 1110 1111 #if 0 /* XXX (msaitoh) */ 1112 static void 1113 scif_stsoft(struct scif_softc *sc, struct tty *tp) 1114 { 1115 u_char msr, delta; 1116 int s; 1117 1118 s = splserial(); 1119 msr = sc->sc_msr; 1120 delta = sc->sc_msr_delta; 1121 sc->sc_msr_delta = 0; 1122 splx(s); 1123 1124 if (ISSET(delta, sc->sc_msr_dcd)) { 1125 /* 1126 * Inform the tty layer that carrier detect changed. 1127 */ 1128 (void) (*tp->t_linesw->l_modem)(tp, ISSET(msr, MSR_DCD)); 1129 } 1130 1131 if (ISSET(delta, sc->sc_msr_cts)) { 1132 /* Block or unblock output according to flow control. */ 1133 if (ISSET(msr, sc->sc_msr_cts)) { 1134 sc->sc_tx_stopped = 0; 1135 (*tp->t_linesw->l_start)(tp); 1136 } else { 1137 sc->sc_tx_stopped = 1; 1138 } 1139 } 1140 1141 #ifdef SCIF_DEBUG 1142 if (scif_debug) 1143 scifstatus(sc, "scif_stsoft"); 1144 #endif 1145 } 1146 #endif /* 0 */ 1147 1148 static void 1149 scifsoft(void *arg) 1150 { 1151 struct scif_softc *sc = arg; 1152 struct tty *tp; 1153 1154 if (!device_is_active(sc->sc_dev)) 1155 return; 1156 1157 tp = sc->sc_tty; 1158 1159 if (sc->sc_rx_ready) { 1160 sc->sc_rx_ready = 0; 1161 scif_rxsoft(sc, tp); 1162 } 1163 1164 #if 0 1165 if (sc->sc_st_check) { 1166 sc->sc_st_check = 0; 1167 scif_stsoft(sc, tp); 1168 } 1169 #endif 1170 1171 if (sc->sc_tx_done) { 1172 sc->sc_tx_done = 0; 1173 scif_txsoft(sc, tp); 1174 } 1175 } 1176 1177 static int 1178 scifintr(void *arg) 1179 { 1180 struct scif_softc *sc = arg; 1181 u_char *put, *end; 1182 u_int cc; 1183 u_short ssr2; 1184 int count; 1185 1186 if (!device_is_active(sc->sc_dev)) 1187 return (0); 1188 1189 end = sc->sc_ebuf; 1190 put = sc->sc_rbput; 1191 cc = sc->sc_rbavail; 1192 1193 do { 1194 ssr2 = scif_ssr_read(); 1195 if (ISSET(ssr2, SCSSR2_BRK)) { 1196 scif_ssr_write(scif_ssr_read() 1197 & ~(SCSSR2_ER | SCSSR2_BRK | SCSSR2_DR)); 1198 #ifdef DDB 1199 if (ISSET(sc->sc_hwflags, SCIF_HW_CONSOLE)) { 1200 console_debugger(); 1201 } 1202 #endif /* DDB */ 1203 #ifdef KGDB 1204 if (ISSET(sc->sc_hwflags, SCIF_HW_KGDB)) { 1205 kgdb_connect(1); 1206 } 1207 #endif /* KGDB */ 1208 } 1209 count = scif_fdr_read() & SCFDR2_RECVCNT; 1210 if (count != 0) { 1211 for (;;) { 1212 u_char c = scif_frdr_read(); 1213 u_char err = (u_char)(scif_ssr_read() & 0x00ff); 1214 1215 scif_ssr_write(scif_ssr_read() 1216 & ~(SCSSR2_ER | SCSSR2_RDF | SCSSR2_DR)); 1217 #ifdef SH4 1218 if (CPU_IS_SH4) 1219 scif_lsr_write(scif_lsr_read() 1220 & ~SCLSR2_ORER); 1221 #endif 1222 if ((cc > 0) && (count > 0)) { 1223 put[0] = c; 1224 put[1] = err; 1225 put += 2; 1226 if (put >= end) 1227 put = sc->sc_rbuf; 1228 cc--; 1229 count--; 1230 } else 1231 break; 1232 } 1233 1234 /* 1235 * Current string of incoming characters ended because 1236 * no more data was available or we ran out of space. 1237 * Schedule a receive event if any data was received. 1238 * If we're out of space, turn off receive interrupts. 1239 */ 1240 sc->sc_rbput = put; 1241 sc->sc_rbavail = cc; 1242 if (!ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) 1243 sc->sc_rx_ready = 1; 1244 1245 /* 1246 * See if we are in danger of overflowing a buffer. If 1247 * so, use hardware flow control to ease the pressure. 1248 */ 1249 if (!ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED) && 1250 cc < sc->sc_r_hiwat) { 1251 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1252 #if 0 1253 scif_hwiflow(sc); 1254 #endif 1255 } 1256 1257 /* 1258 * If we're out of space, disable receive interrupts 1259 * until the queue has drained a bit. 1260 */ 1261 if (!cc) { 1262 SET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1263 scif_scr_write(scif_scr_read() & ~SCSCR2_RIE); 1264 } 1265 } else { 1266 if (scif_ssr_read() & (SCSSR2_RDF | SCSSR2_DR)) { 1267 scif_scr_write(scif_scr_read() 1268 & ~(SCSCR2_TIE | SCSCR2_RIE)); 1269 delay(10); 1270 scif_scr_write(scif_scr_read() 1271 | SCSCR2_TIE | SCSCR2_RIE); 1272 continue; 1273 } 1274 } 1275 } while (scif_ssr_read() & (SCSSR2_RDF | SCSSR2_DR)); 1276 1277 #if 0 1278 msr = bus_space_read_1(iot, ioh, scif_msr); 1279 delta = msr ^ sc->sc_msr; 1280 sc->sc_msr = msr; 1281 if (ISSET(delta, sc->sc_msr_mask)) { 1282 SET(sc->sc_msr_delta, delta); 1283 1284 /* 1285 * Pulse-per-second clock signal on edge of DCD? 1286 */ 1287 if (ISSET(delta, sc->sc_ppsmask)) { 1288 struct timeval tv; 1289 if (ISSET(msr, sc->sc_ppsmask) == 1290 sc->sc_ppsassert) { 1291 /* XXX nanotime() */ 1292 microtime(&tv); 1293 TIMEVAL_TO_TIMESPEC(&tv, 1294 &sc->ppsinfo.assert_timestamp); 1295 if (sc->ppsparam.mode & PPS_OFFSETASSERT) { 1296 timespecadd(&sc->ppsinfo.assert_timestamp, 1297 &sc->ppsparam.assert_offset, 1298 &sc->ppsinfo.assert_timestamp); 1299 TIMESPEC_TO_TIMEVAL(&tv, &sc->ppsinfo.assert_timestamp); 1300 } 1301 1302 #ifdef PPS_SYNC 1303 if (sc->ppsparam.mode & PPS_HARDPPSONASSERT) 1304 hardpps(&tv, tv.tv_usec); 1305 #endif 1306 sc->ppsinfo.assert_sequence++; 1307 sc->ppsinfo.current_mode = 1308 sc->ppsparam.mode; 1309 1310 } else if (ISSET(msr, sc->sc_ppsmask) == 1311 sc->sc_ppsclear) { 1312 /* XXX nanotime() */ 1313 microtime(&tv); 1314 TIMEVAL_TO_TIMESPEC(&tv, 1315 &sc->ppsinfo.clear_timestamp); 1316 if (sc->ppsparam.mode & PPS_OFFSETCLEAR) { 1317 timespecadd(&sc->ppsinfo.clear_timestamp, 1318 &sc->ppsparam.clear_offset, 1319 &sc->ppsinfo.clear_timestamp); 1320 TIMESPEC_TO_TIMEVAL(&tv, &sc->ppsinfo.clear_timestamp); 1321 } 1322 1323 #ifdef PPS_SYNC 1324 if (sc->ppsparam.mode & PPS_HARDPPSONCLEAR) 1325 hardpps(&tv, tv.tv_usec); 1326 #endif 1327 sc->ppsinfo.clear_sequence++; 1328 sc->ppsinfo.current_mode = 1329 sc->ppsparam.mode; 1330 } 1331 } 1332 1333 /* 1334 * Stop output immediately if we lose the output 1335 * flow control signal or carrier detect. 1336 */ 1337 if (ISSET(~msr, sc->sc_msr_mask)) { 1338 sc->sc_tbc = 0; 1339 sc->sc_heldtbc = 0; 1340 #ifdef SCIF_DEBUG 1341 if (scif_debug) 1342 scifstatus(sc, "scifintr "); 1343 #endif 1344 } 1345 1346 sc->sc_st_check = 1; 1347 } 1348 #endif 1349 1350 /* 1351 * Done handling any receive interrupts. See if data can be 1352 * transmitted as well. Schedule tx done event if no data left 1353 * and tty was marked busy. 1354 */ 1355 if (((scif_fdr_read() & SCFDR2_TXCNT) >> 8) != 16) { /* XXX (msaitoh) */ 1356 /* 1357 * If we've delayed a parameter change, do it now, and restart 1358 * output. 1359 */ 1360 if (sc->sc_heldchange) { 1361 sc->sc_heldchange = 0; 1362 sc->sc_tbc = sc->sc_heldtbc; 1363 sc->sc_heldtbc = 0; 1364 } 1365 1366 /* Output the next chunk of the contiguous buffer, if any. */ 1367 if (sc->sc_tbc > 0) { 1368 int n; 1369 int maxchars; 1370 int i; 1371 1372 n = sc->sc_tbc; 1373 maxchars = sc->sc_fifolen - 1374 ((scif_fdr_read() & SCFDR2_TXCNT) >> 8); 1375 if (n > maxchars) 1376 n = maxchars; 1377 1378 for (i = 0; i < n; i++) { 1379 scif_putc(*(sc->sc_tba)); 1380 sc->sc_tba++; 1381 } 1382 sc->sc_tbc -= n; 1383 } else { 1384 /* Disable transmit completion interrupts if necessary. */ 1385 #if 0 1386 if (ISSET(sc->sc_ier, IER_ETXRDY)) 1387 #endif 1388 scif_scr_write(scif_scr_read() & ~SCSCR2_TIE); 1389 1390 if (sc->sc_tx_busy) { 1391 sc->sc_tx_busy = 0; 1392 sc->sc_tx_done = 1; 1393 } 1394 } 1395 } 1396 1397 /* Wake up the poller. */ 1398 softint_schedule(sc->sc_si); 1399 1400 #if NRND > 0 && defined(RND_SCIF) 1401 rnd_add_uint32(&sc->rnd_source, iir | lsr); 1402 #endif 1403 1404 return (1); 1405 } 1406 1407 void 1408 scifcnprobe(struct consdev *cp) 1409 { 1410 int maj; 1411 1412 /* locate the major number */ 1413 maj = cdevsw_lookup_major(&scif_cdevsw); 1414 1415 /* Initialize required fields. */ 1416 cp->cn_dev = makedev(maj, 0); 1417 #ifdef SCIFCONSOLE 1418 cp->cn_pri = CN_REMOTE; 1419 #else 1420 cp->cn_pri = CN_NORMAL; 1421 #endif 1422 } 1423 1424 void 1425 scifcninit(struct consdev *cp) 1426 { 1427 1428 InitializeScif(scifcn_speed); 1429 scifisconsole = 1; 1430 } 1431 1432 int 1433 scifcngetc(dev_t dev) 1434 { 1435 int c; 1436 int s; 1437 1438 s = splserial(); 1439 c = scif_getc(); 1440 splx(s); 1441 1442 return (c); 1443 } 1444 1445 void 1446 scifcnputc(dev_t dev, int c) 1447 { 1448 int s; 1449 1450 s = splserial(); 1451 scif_putc((u_char)c); 1452 splx(s); 1453 } 1454 1455 #ifdef KGDB 1456 int 1457 scif_kgdb_init(void) 1458 { 1459 1460 if (strcmp(kgdb_devname, "scif") != 0) 1461 return (1); 1462 1463 if (scifisconsole) 1464 return (1); /* can't share with console */ 1465 1466 InitializeScif(kgdb_rate); 1467 1468 kgdb_attach((int (*)(void *))scifcngetc, 1469 (void (*)(void *, int))scifcnputc, NULL); 1470 kgdb_dev = 123; /* unneeded, only to satisfy some tests */ 1471 kgdb_attached = 1; 1472 1473 return (0); 1474 } 1475 #endif /* KGDB */ 1476
Indexes created Tue Sep 23 21:09:50 GMT 2025