1 /* $NetBSD: scif.c,v 1.55 2007/12/03 15:34:18 ad 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 * 3. All advertising materials mentioning features or use of this software 45 * must display the following acknowledgement: 46 * This product includes software developed by the NetBSD 47 * Foundation, Inc. and its contributors. 48 * 4. Neither the name of The NetBSD Foundation nor the names of its 49 * contributors may be used to endorse or promote products derived 50 * from this software without specific prior written permission. 51 * 52 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 53 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 54 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 55 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 56 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 57 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 58 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 59 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 60 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 61 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 62 * POSSIBILITY OF SUCH DAMAGE. 63 */ 64 65 /* 66 * Copyright (c) 1991 The Regents of the University of California. 67 * All rights reserved. 68 * 69 * Redistribution and use in source and binary forms, with or without 70 * modification, are permitted provided that the following conditions 71 * are met: 72 * 1. Redistributions of source code must retain the above copyright 73 * notice, this list of conditions and the following disclaimer. 74 * 2. Redistributions in binary form must reproduce the above copyright 75 * notice, this list of conditions and the following disclaimer in the 76 * documentation and/or other materials provided with the distribution. 77 * 3. Neither the name of the University nor the names of its contributors 78 * may be used to endorse or promote products derived from this software 79 * without specific prior written permission. 80 * 81 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 82 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 83 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 84 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 85 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 86 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 87 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 88 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 89 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 90 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 91 * SUCH DAMAGE. 92 * 93 * @(#)com.c 7.5 (Berkeley) 5/16/91 94 */ 95 96 /* 97 * SH internal serial driver 98 * 99 * This code is derived from both z8530tty.c and com.c 100 */ 101 102 #include <sys/cdefs.h> 103 __KERNEL_RCSID(0, "$NetBSD: scif.c,v 1.55 2007/12/03 15:34:18 ad Exp $"); 104 105 #include "opt_kgdb.h" 106 #include "opt_scif.h" 107 108 #include <sys/param.h> 109 #include <sys/systm.h> 110 #include <sys/tty.h> 111 #include <sys/proc.h> 112 #include <sys/conf.h> 113 #include <sys/file.h> 114 #include <sys/syslog.h> 115 #include <sys/kernel.h> 116 #include <sys/device.h> 117 #include <sys/malloc.h> 118 #include <sys/kgdb.h> 119 #include <sys/kauth.h> 120 #include <sys/intr.h> 121 122 #include <dev/cons.h> 123 124 #include <sh3/clock.h> 125 #include <sh3/exception.h> 126 #include <sh3/scifreg.h> 127 128 #include <sh3/dev/scifvar.h> 129 130 #include "locators.h" 131 132 133 struct scif_softc { 134 struct device sc_dev; /* boilerplate */ 135 136 struct tty *sc_tty; 137 void *sc_si; 138 139 callout_t sc_diag_ch; 140 141 #if 0 142 bus_space_tag_t sc_iot; /* ISA i/o space identifier */ 143 bus_space_handle_t sc_ioh; /* ISA io handle */ 144 145 int sc_drq; 146 147 int sc_frequency; 148 #endif 149 150 u_int sc_overflows, 151 sc_floods, 152 sc_errors; /* number of retries so far */ 153 u_char sc_status[7]; /* copy of registers */ 154 155 int sc_hwflags; 156 int sc_swflags; 157 u_int sc_fifolen; 158 159 u_int sc_r_hiwat, 160 sc_r_lowat; 161 u_char *volatile sc_rbget, 162 *volatile sc_rbput; 163 volatile u_int sc_rbavail; 164 u_char *sc_rbuf, 165 *sc_ebuf; 166 167 u_char *sc_tba; /* transmit buffer address */ 168 u_int sc_tbc, /* transmit byte count */ 169 sc_heldtbc; 170 171 volatile u_char sc_rx_flags, 172 #define RX_TTY_BLOCKED 0x01 173 #define RX_TTY_OVERFLOWED 0x02 174 #define RX_IBUF_BLOCKED 0x04 175 #define RX_IBUF_OVERFLOWED 0x08 176 #define RX_ANY_BLOCK 0x0f 177 sc_tx_busy, /* working on an output chunk */ 178 sc_tx_done, /* done with one output chunk */ 179 sc_tx_stopped, /* H/W level stop (lost CTS) */ 180 sc_st_check, /* got a status interrupt */ 181 sc_rx_ready; 182 183 volatile u_char sc_heldchange; 184 }; 185 186 187 static int scif_match(device_t, struct cfdata *, void *); 188 static void scif_attach(device_t, device_t, void *); 189 190 CFATTACH_DECL(scif, sizeof(struct scif_softc), 191 scif_match, scif_attach, NULL, NULL); 192 193 static int scif_attached = 0; /* XXX: FIXME: don't limit to just one! */ 194 195 extern struct cfdriver scif_cd; 196 197 #define SCIFUNIT_MASK 0x7ffff 198 #define SCIFDIALOUT_MASK 0x80000 199 200 #define SCIFUNIT(x) (minor(x) & SCIFUNIT_MASK) 201 #define SCIFDIALOUT(x) (minor(x) & SCIFDIALOUT_MASK) 202 203 204 /* console */ 205 dev_type_cnprobe(scifcnprobe); 206 dev_type_cninit(scifcninit); 207 dev_type_cngetc(scifcngetc); 208 dev_type_cnputc(scifcnputc); 209 210 211 /* cdevsw */ 212 dev_type_open(scifopen); 213 dev_type_close(scifclose); 214 dev_type_read(scifread); 215 dev_type_write(scifwrite); 216 dev_type_ioctl(scifioctl); 217 dev_type_stop(scifstop); 218 dev_type_tty(sciftty); 219 dev_type_poll(scifpoll); 220 221 const struct cdevsw scif_cdevsw = { 222 scifopen, scifclose, scifread, scifwrite, scifioctl, 223 scifstop, sciftty, scifpoll, nommap, ttykqfilter, D_TTY 224 }; 225 226 227 /* struct tty */ 228 static void scifstart(struct tty *); 229 static int scifparam(struct tty *, struct termios *); 230 231 232 void InitializeScif (unsigned int); 233 int ScifErrCheck(void); 234 void scif_putc(unsigned char); 235 unsigned char scif_getc(void); 236 237 static int scifintr(void *); 238 static void scifsoft(void *); 239 static void scif_rxsoft(struct scif_softc *, struct tty *); 240 static void scif_txsoft(struct scif_softc *, struct tty *); 241 #if 0 242 static void scif_stsoft(struct scif_softc *, struct tty *); 243 #endif 244 static void scif_schedrx(struct scif_softc *); 245 static void scifdiag(void *); 246 247 static void scif_break(struct scif_softc *, int); 248 static void scif_iflush(struct scif_softc *); 249 250 251 /* Hardware flag masks (sc_hwflags) */ 252 #define SCIF_HW_NOIEN 0x01 253 #define SCIF_HW_FIFO 0x02 254 #define SCIF_HW_FLOW 0x08 255 #define SCIF_HW_DEV_OK 0x20 256 #define SCIF_HW_CONSOLE 0x40 257 #define SCIF_HW_KGDB 0x80 258 259 260 /* Buffer size for character buffer */ 261 #define SCIF_RING_SIZE 2048 262 static unsigned int scif_rbuf_size = SCIF_RING_SIZE; 263 264 /* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 265 static unsigned int scif_rbuf_hiwat = (SCIF_RING_SIZE * 1) / 4; 266 static unsigned int scif_rbuf_lowat = (SCIF_RING_SIZE * 3) / 4; 267 268 269 #ifdef SCIFCN_SPEED 270 unsigned int scifcn_speed = SCIFCN_SPEED; 271 #else 272 unsigned int scifcn_speed = 9600; 273 #endif 274 275 #define CONMODE ((TTYDEF_CFLAG & ~(CSIZE | CSTOPB | PARENB)) | CS8) /* 8N1 */ 276 int scifconscflag = CONMODE; 277 278 static int scifisconsole = 0; 279 280 #ifdef KGDB 281 static int kgdb_attached = 0; 282 #endif 283 284 285 #define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */ 286 287 288 /* XXX: uwe 289 * Prepare for bus_spacification. The difference in access widths is 290 * still handled by the magic definitions in scifreg.h 291 */ 292 #define scif_smr_read() SHREG_SCSMR2 293 #define scif_smr_write(v) (SHREG_SCSMR2 = (v)) 294 295 #define scif_brr_read() SHREG_SCBRR2 296 #define scif_brr_write(v) (SHREG_SCBRR2 = (v)) 297 298 #define scif_scr_read() SHREG_SCSCR2 299 #define scif_scr_write(v) (SHREG_SCSCR2 = (v)) 300 301 #define scif_ftdr_write(v) (SHREG_SCFTDR2 = (v)) 302 303 #define scif_ssr_read() SHREG_SCSSR2 304 #define scif_ssr_write(v) (SHREG_SCSSR2 = (v)) 305 306 #define scif_frdr_read() SHREG_SCFRDR2 307 308 #define scif_fcr_read() SHREG_SCFCR2 309 #define scif_fcr_write(v) (SHREG_SCFCR2 = (v)) 310 311 #define scif_fdr_read() SHREG_SCFDR2 312 313 #ifdef SH4 /* additional registers in sh4 */ 314 315 #define scif_sptr_read() SHREG_SCSPTR2 316 #define scif_sptr_write(v) (SHREG_SCSPTR2 = (v)) 317 318 #define scif_lsr_read() SHREG_SCLSR2 319 #define scif_lsr_write(v) (SHREG_SCLSR2 = (v)) 320 321 #endif /* SH4 */ 322 323 324 void 325 InitializeScif(unsigned int bps) 326 { 327 328 /* Initialize SCR */ 329 scif_scr_write(0x00); 330 331 #if 0 332 scif_fcr_write(SCFCR2_TFRST | SCFCR2_RFRST | SCFCR2_MCE); 333 #else 334 scif_fcr_write(SCFCR2_TFRST | SCFCR2_RFRST); 335 #endif 336 /* Serial Mode Register */ 337 scif_smr_write(0x00); /* 8bit,NonParity,Even,1Stop */ 338 339 /* Bit Rate Register */ 340 scif_brr_write(divrnd(sh_clock_get_pclock(), 32 * bps) - 1); 341 342 /* 343 * wait 2m Sec, because Send/Recv must begin 1 bit period after 344 * BRR is set. 345 */ 346 delay(2000); 347 348 #if 0 349 scif_fcr_write(FIFO_RCV_TRIGGER_14 | FIFO_XMT_TRIGGER_1 | SCFCR2_MCE); 350 #else 351 scif_fcr_write(FIFO_RCV_TRIGGER_14 | FIFO_XMT_TRIGGER_1); 352 #endif 353 354 /* Send permission, Receive permission ON */ 355 scif_scr_write(SCSCR2_TE | SCSCR2_RE); 356 357 /* Serial Status Register */ 358 scif_ssr_write(scif_ssr_read() & SCSSR2_TDFE); /* Clear Status */ 359 } 360 361 int 362 ScifErrCheck(void) 363 { 364 365 return (scif_ssr_read() & (SCSSR2_ER | SCSSR2_FER | SCSSR2_PER)); 366 } 367 368 void 369 scif_putc(unsigned char c) 370 { 371 372 /* wait for ready */ 373 while ((scif_fdr_read() & SCFDR2_TXCNT) == SCFDR2_TXF_FULL) 374 continue; 375 376 /* write send data to send register */ 377 scif_ftdr_write(c); 378 379 /* clear ready flag */ 380 scif_ssr_write(scif_ssr_read() & ~(SCSSR2_TDFE | SCSSR2_TEND)); 381 } 382 383 unsigned char 384 scif_getc(void) 385 { 386 unsigned char c, err_c; 387 #ifdef SH4 388 unsigned short err_c2 = 0; /* XXXGCC: -Wuninitialized */ 389 #endif 390 391 for (;;) { 392 /* wait for ready */ 393 while ((scif_fdr_read() & SCFDR2_RECVCNT) == 0) 394 continue; 395 396 c = scif_frdr_read(); 397 err_c = scif_ssr_read(); 398 scif_ssr_write(scif_ssr_read() 399 & ~(SCSSR2_ER | SCSSR2_BRK | SCSSR2_RDF | SCSSR2_DR)); 400 #ifdef SH4 401 if (CPU_IS_SH4) { 402 err_c2 = scif_lsr_read(); 403 scif_lsr_write(scif_lsr_read() & ~SCLSR2_ORER); 404 } 405 #endif 406 if ((err_c & (SCSSR2_ER | SCSSR2_BRK | SCSSR2_FER 407 | SCSSR2_PER)) == 0) 408 { 409 #ifdef SH4 410 if (CPU_IS_SH4 && ((err_c2 & SCLSR2_ORER) == 0)) 411 #endif 412 return(c); 413 } 414 } 415 416 } 417 418 static int 419 scif_match(device_t parent, struct cfdata *cfp, void *aux) 420 { 421 422 if (scif_attached) 423 return 0; 424 425 if (strcmp(cfp->cf_name, "scif") != 0) 426 return 0; 427 428 return 1; 429 } 430 431 static void 432 scif_attach(device_t parent, device_t self, void *aux) 433 { 434 struct scif_softc *sc = device_private(self); 435 struct tty *tp; 436 437 scif_attached = 1; 438 439 sc->sc_hwflags = 0; /* XXX */ 440 sc->sc_swflags = 0; /* XXX */ 441 sc->sc_fifolen = 16; 442 443 aprint_normal("\n"); 444 if (scifisconsole) { 445 aprint_naive(" (console)\n"); 446 aprint_normal_dev(self, "console\n"); 447 SET(sc->sc_hwflags, SCIF_HW_CONSOLE); 448 SET(sc->sc_swflags, TIOCFLAG_SOFTCAR); 449 } 450 #ifdef KGDB 451 else if (kgdb_attached) { 452 aprint_naive(" (kgdb)\n"); 453 aprint_normal_dev(self, "kgdb\n"); 454 SET(sc->sc_hwflags, SCIF_HW_KGDB); 455 SET(sc->sc_swflags, TIOCFLAG_SOFTCAR); 456 } 457 #endif 458 else { 459 aprint_naive("\n"); 460 InitializeScif(9600); /* XXX */ 461 } 462 463 callout_init(&sc->sc_diag_ch, 0); 464 #ifdef SH4 465 intc_intr_establish(SH4_INTEVT_SCIF_ERI, IST_LEVEL, IPL_SERIAL, 466 scifintr, sc); 467 intc_intr_establish(SH4_INTEVT_SCIF_RXI, IST_LEVEL, IPL_SERIAL, 468 scifintr, sc); 469 intc_intr_establish(SH4_INTEVT_SCIF_BRI, IST_LEVEL, IPL_SERIAL, 470 scifintr, sc); 471 intc_intr_establish(SH4_INTEVT_SCIF_TXI, IST_LEVEL, IPL_SERIAL, 472 scifintr, sc); 473 #else 474 intc_intr_establish(SH7709_INTEVT2_SCIF_ERI, IST_LEVEL, IPL_SERIAL, 475 scifintr, sc); 476 intc_intr_establish(SH7709_INTEVT2_SCIF_RXI, IST_LEVEL, IPL_SERIAL, 477 scifintr, sc); 478 intc_intr_establish(SH7709_INTEVT2_SCIF_BRI, IST_LEVEL, IPL_SERIAL, 479 scifintr, sc); 480 intc_intr_establish(SH7709_INTEVT2_SCIF_TXI, IST_LEVEL, IPL_SERIAL, 481 scifintr, sc); 482 #endif 483 484 sc->sc_si = softint_establish(SOFTINT_SERIAL, scifsoft, sc); 485 SET(sc->sc_hwflags, SCIF_HW_DEV_OK); 486 487 tp = ttymalloc(); 488 tp->t_oproc = scifstart; 489 tp->t_param = scifparam; 490 tp->t_hwiflow = NULL; 491 492 sc->sc_tty = tp; 493 sc->sc_rbuf = malloc(scif_rbuf_size << 1, M_DEVBUF, M_NOWAIT); 494 if (sc->sc_rbuf == NULL) { 495 aprint_error_dev(self, "unable to allocate ring buffer\n"); 496 return; 497 } 498 sc->sc_ebuf = sc->sc_rbuf + (scif_rbuf_size << 1); 499 500 tty_attach(tp); 501 } 502 503 /* 504 * Start or restart transmission. 505 */ 506 static void 507 scifstart(struct tty *tp) 508 { 509 struct scif_softc *sc = device_lookup(&scif_cd, SCIFUNIT(tp->t_dev)); 510 int s; 511 512 s = spltty(); 513 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 514 goto out; 515 if (sc->sc_tx_stopped) 516 goto out; 517 if (!ttypull(tp)) 518 goto out; 519 520 /* Grab the first contiguous region of buffer space. */ 521 { 522 u_char *tba; 523 int tbc; 524 525 tba = tp->t_outq.c_cf; 526 tbc = ndqb(&tp->t_outq, 0); 527 528 (void)splserial(); 529 530 sc->sc_tba = tba; 531 sc->sc_tbc = tbc; 532 } 533 534 SET(tp->t_state, TS_BUSY); 535 sc->sc_tx_busy = 1; 536 537 /* Enable transmit completion interrupts if necessary. */ 538 scif_scr_write(scif_scr_read() | SCSCR2_TIE | SCSCR2_RIE); 539 540 /* Output the first chunk of the contiguous buffer. */ 541 { 542 int n; 543 int maxchars; 544 int i; 545 546 n = sc->sc_tbc; 547 maxchars = sc->sc_fifolen 548 - ((scif_fdr_read() & SCFDR2_TXCNT) >> 8); 549 if (n > maxchars) 550 n = maxchars; 551 552 for (i = 0; i < n; i++) { 553 scif_putc(*(sc->sc_tba)); 554 sc->sc_tba++; 555 } 556 sc->sc_tbc -= n; 557 } 558 out: 559 splx(s); 560 return; 561 } 562 563 /* 564 * Set SCIF tty parameters from termios. 565 * XXX - Should just copy the whole termios after 566 * making sure all the changes could be done. 567 */ 568 static int 569 scifparam(struct tty *tp, struct termios *t) 570 { 571 struct scif_softc *sc = device_lookup(&scif_cd, SCIFUNIT(tp->t_dev)); 572 int ospeed = t->c_ospeed; 573 int s; 574 575 if (!device_is_active(&sc->sc_dev)) 576 return (EIO); 577 578 /* Check requested parameters. */ 579 if (ospeed < 0) 580 return (EINVAL); 581 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 582 return (EINVAL); 583 584 /* 585 * For the console, always force CLOCAL and !HUPCL, so that the port 586 * is always active. 587 */ 588 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) || 589 ISSET(sc->sc_hwflags, SCIF_HW_CONSOLE)) { 590 SET(t->c_cflag, CLOCAL); 591 CLR(t->c_cflag, HUPCL); 592 } 593 594 /* 595 * If there were no changes, don't do anything. This avoids dropping 596 * input and improves performance when all we did was frob things like 597 * VMIN and VTIME. 598 */ 599 if (tp->t_ospeed == t->c_ospeed && 600 tp->t_cflag == t->c_cflag) 601 return (0); 602 603 #if 0 604 /* XXX (msaitoh) */ 605 lcr = ISSET(sc->sc_lcr, LCR_SBREAK) | cflag2lcr(t->c_cflag); 606 #endif 607 608 s = splserial(); 609 610 /* 611 * Set the flow control pins depending on the current flow control 612 * mode. 613 */ 614 if (ISSET(t->c_cflag, CRTSCTS)) { 615 scif_fcr_write(scif_fcr_read() | SCFCR2_MCE); 616 } else { 617 scif_fcr_write(scif_fcr_read() & ~SCFCR2_MCE); 618 } 619 620 scif_brr_write(divrnd(sh_clock_get_pclock(), 32 * ospeed) -1); 621 622 /* 623 * Set the FIFO threshold based on the receive speed. 624 * 625 * * If it's a low speed, it's probably a mouse or some other 626 * interactive device, so set the threshold low. 627 * * If it's a high speed, trim the trigger level down to prevent 628 * overflows. 629 * * Otherwise set it a bit higher. 630 */ 631 #if 0 632 /* XXX (msaitoh) */ 633 if (ISSET(sc->sc_hwflags, SCIF_HW_HAYESP)) 634 sc->sc_fifo = FIFO_DMA_MODE | FIFO_ENABLE | FIFO_TRIGGER_8; 635 else if (ISSET(sc->sc_hwflags, SCIF_HW_FIFO)) 636 sc->sc_fifo = FIFO_ENABLE | 637 (t->c_ospeed <= 1200 ? FIFO_TRIGGER_1 : 638 t->c_ospeed <= 38400 ? FIFO_TRIGGER_8 : FIFO_TRIGGER_4); 639 else 640 sc->sc_fifo = 0; 641 #endif 642 643 /* And copy to tty. */ 644 tp->t_ispeed = 0; 645 tp->t_ospeed = t->c_ospeed; 646 tp->t_cflag = t->c_cflag; 647 648 if (!sc->sc_heldchange) { 649 if (sc->sc_tx_busy) { 650 sc->sc_heldtbc = sc->sc_tbc; 651 sc->sc_tbc = 0; 652 sc->sc_heldchange = 1; 653 } 654 #if 0 655 /* XXX (msaitoh) */ 656 else 657 scif_loadchannelregs(sc); 658 #endif 659 } 660 661 if (!ISSET(t->c_cflag, CHWFLOW)) { 662 /* Disable the high water mark. */ 663 sc->sc_r_hiwat = 0; 664 sc->sc_r_lowat = 0; 665 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 666 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 667 scif_schedrx(sc); 668 } 669 } else { 670 sc->sc_r_hiwat = scif_rbuf_hiwat; 671 sc->sc_r_lowat = scif_rbuf_lowat; 672 } 673 674 splx(s); 675 676 #ifdef SCIF_DEBUG 677 if (scif_debug) 678 scifstatus(sc, "scifparam "); 679 #endif 680 681 if (!ISSET(t->c_cflag, CHWFLOW)) { 682 if (sc->sc_tx_stopped) { 683 sc->sc_tx_stopped = 0; 684 scifstart(tp); 685 } 686 } 687 688 return (0); 689 } 690 691 static void 692 scif_iflush(struct scif_softc *sc) 693 { 694 int i; 695 unsigned char c; 696 697 i = scif_fdr_read() & SCFDR2_RECVCNT; 698 699 while (i > 0) { 700 c = scif_frdr_read(); 701 scif_ssr_write(scif_ssr_read() & ~(SCSSR2_RDF | SCSSR2_DR)); 702 i--; 703 } 704 } 705 706 int 707 scifopen(dev_t dev, int flag, int mode, struct lwp *l) 708 { 709 struct scif_softc *sc; 710 struct tty *tp; 711 int s, s2; 712 int error; 713 714 sc = device_lookup(&scif_cd, SCIFUNIT(dev)); 715 if (sc == 0 || !ISSET(sc->sc_hwflags, SCIF_HW_DEV_OK) || 716 sc->sc_rbuf == NULL) 717 return (ENXIO); 718 719 if (!device_is_active(&sc->sc_dev)) 720 return (ENXIO); 721 722 #ifdef KGDB 723 /* 724 * If this is the kgdb port, no other use is permitted. 725 */ 726 if (ISSET(sc->sc_hwflags, SCIF_HW_KGDB)) 727 return (EBUSY); 728 #endif /* KGDB */ 729 730 tp = sc->sc_tty; 731 732 if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp)) 733 return (EBUSY); 734 735 s = spltty(); 736 737 /* 738 * Do the following iff this is a first open. 739 */ 740 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 741 struct termios t; 742 743 tp->t_dev = dev; 744 745 s2 = splserial(); 746 747 /* Turn on interrupts. */ 748 scif_scr_write(scif_scr_read() | SCSCR2_TIE | SCSCR2_RIE); 749 750 splx(s2); 751 752 /* 753 * Initialize the termios status to the defaults. Add in the 754 * sticky bits from TIOCSFLAGS. 755 */ 756 t.c_ispeed = 0; 757 if (ISSET(sc->sc_hwflags, SCIF_HW_CONSOLE)) { 758 t.c_ospeed = scifcn_speed; /* XXX (msaitoh) */ 759 t.c_cflag = scifconscflag; 760 } else { 761 t.c_ospeed = TTYDEF_SPEED; 762 t.c_cflag = TTYDEF_CFLAG; 763 } 764 if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL)) 765 SET(t.c_cflag, CLOCAL); 766 if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)) 767 SET(t.c_cflag, CRTSCTS); 768 if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF)) 769 SET(t.c_cflag, MDMBUF); 770 /* Make sure scifparam() will do something. */ 771 tp->t_ospeed = 0; 772 (void) scifparam(tp, &t); 773 tp->t_iflag = TTYDEF_IFLAG; 774 tp->t_oflag = TTYDEF_OFLAG; 775 tp->t_lflag = TTYDEF_LFLAG; 776 ttychars(tp); 777 ttsetwater(tp); 778 779 s2 = splserial(); 780 781 /* Clear the input ring, and unblock. */ 782 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 783 sc->sc_rbavail = scif_rbuf_size; 784 scif_iflush(sc); 785 CLR(sc->sc_rx_flags, RX_ANY_BLOCK); 786 #if 0 787 /* XXX (msaitoh) */ 788 scif_hwiflow(sc); 789 #endif 790 791 #ifdef SCIF_DEBUG 792 if (scif_debug) 793 scifstatus(sc, "scifopen "); 794 #endif 795 796 splx(s2); 797 } 798 799 splx(s); 800 801 error = ttyopen(tp, SCIFDIALOUT(dev), ISSET(flag, O_NONBLOCK)); 802 if (error) 803 goto bad; 804 805 error = (*tp->t_linesw->l_open)(dev, tp); 806 if (error) 807 goto bad; 808 809 return (0); 810 811 bad: 812 813 return (error); 814 } 815 816 int 817 scifclose(dev_t dev, int flag, int mode, struct lwp *l) 818 { 819 struct scif_softc *sc = device_lookup(&scif_cd, SCIFUNIT(dev)); 820 struct tty *tp = sc->sc_tty; 821 822 /* XXX This is for cons.c. */ 823 if (!ISSET(tp->t_state, TS_ISOPEN)) 824 return (0); 825 826 (*tp->t_linesw->l_close)(tp, flag); 827 ttyclose(tp); 828 829 if (!device_is_active(&sc->sc_dev)) 830 return (0); 831 832 return (0); 833 } 834 835 int 836 scifread(dev_t dev, struct uio *uio, int flag) 837 { 838 struct scif_softc *sc = device_lookup(&scif_cd, SCIFUNIT(dev)); 839 struct tty *tp = sc->sc_tty; 840 841 return ((*tp->t_linesw->l_read)(tp, uio, flag)); 842 } 843 844 int 845 scifwrite(dev_t dev, struct uio *uio, int flag) 846 { 847 struct scif_softc *sc = device_lookup(&scif_cd, SCIFUNIT(dev)); 848 struct tty *tp = sc->sc_tty; 849 850 return ((*tp->t_linesw->l_write)(tp, uio, flag)); 851 } 852 853 int 854 scifpoll(dev_t dev, int events, struct lwp *l) 855 { 856 struct scif_softc *sc = device_lookup(&scif_cd, SCIFUNIT(dev)); 857 struct tty *tp = sc->sc_tty; 858 859 return ((*tp->t_linesw->l_poll)(tp, events, l)); 860 } 861 862 struct tty * 863 sciftty(dev_t dev) 864 { 865 struct scif_softc *sc = device_lookup(&scif_cd, SCIFUNIT(dev)); 866 struct tty *tp = sc->sc_tty; 867 868 return (tp); 869 } 870 871 int 872 scifioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 873 { 874 struct scif_softc *sc = device_lookup(&scif_cd, SCIFUNIT(dev)); 875 struct tty *tp = sc->sc_tty; 876 int error; 877 int s; 878 879 if (!device_is_active(&sc->sc_dev)) 880 return (EIO); 881 882 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 883 if (error != EPASSTHROUGH) 884 return (error); 885 886 error = ttioctl(tp, cmd, data, flag, l); 887 if (error != EPASSTHROUGH) 888 return (error); 889 890 error = 0; 891 892 s = splserial(); 893 894 switch (cmd) { 895 case TIOCSBRK: 896 scif_break(sc, 1); 897 break; 898 899 case TIOCCBRK: 900 scif_break(sc, 0); 901 break; 902 903 case TIOCGFLAGS: 904 *(int *)data = sc->sc_swflags; 905 break; 906 907 case TIOCSFLAGS: 908 error = kauth_authorize_device_tty(l->l_cred, 909 KAUTH_DEVICE_TTY_PRIVSET, tp); 910 if (error) 911 break; 912 sc->sc_swflags = *(int *)data; 913 break; 914 915 default: 916 error = EPASSTHROUGH; 917 break; 918 } 919 920 splx(s); 921 922 return (error); 923 } 924 925 static void 926 scif_schedrx(struct scif_softc *sc) 927 { 928 929 sc->sc_rx_ready = 1; 930 931 /* Wake up the poller. */ 932 softint_schedule(sc->sc_si); 933 } 934 935 static void 936 scif_break(struct scif_softc *sc, int onoff) 937 { 938 939 if (onoff) 940 scif_ssr_write(scif_ssr_read() & ~SCSSR2_TDFE); 941 else 942 scif_ssr_write(scif_ssr_read() | SCSSR2_TDFE); 943 944 #if 0 /* XXX */ 945 if (!sc->sc_heldchange) { 946 if (sc->sc_tx_busy) { 947 sc->sc_heldtbc = sc->sc_tbc; 948 sc->sc_tbc = 0; 949 sc->sc_heldchange = 1; 950 } else 951 scif_loadchannelregs(sc); 952 } 953 #endif 954 } 955 956 /* 957 * Stop output, e.g., for ^S or output flush. 958 */ 959 void 960 scifstop(struct tty *tp, int flag) 961 { 962 struct scif_softc *sc = device_lookup(&scif_cd, SCIFUNIT(tp->t_dev)); 963 int s; 964 965 s = splserial(); 966 if (ISSET(tp->t_state, TS_BUSY)) { 967 /* Stop transmitting at the next chunk. */ 968 sc->sc_tbc = 0; 969 sc->sc_heldtbc = 0; 970 if (!ISSET(tp->t_state, TS_TTSTOP)) 971 SET(tp->t_state, TS_FLUSH); 972 } 973 splx(s); 974 } 975 976 static void 977 scifdiag(void *arg) 978 { 979 struct scif_softc *sc = arg; 980 int overflows, floods; 981 int s; 982 983 s = splserial(); 984 overflows = sc->sc_overflows; 985 sc->sc_overflows = 0; 986 floods = sc->sc_floods; 987 sc->sc_floods = 0; 988 sc->sc_errors = 0; 989 splx(s); 990 991 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 992 device_xname(&sc->sc_dev), 993 overflows, overflows == 1 ? "" : "s", 994 floods, floods == 1 ? "" : "s"); 995 } 996 997 static void 998 scif_rxsoft(struct scif_softc *sc, struct tty *tp) 999 { 1000 int (*rint)(int, struct tty *) = tp->t_linesw->l_rint; 1001 u_char *get, *end; 1002 u_int cc, scc; 1003 u_char ssr2; 1004 int code; 1005 int s; 1006 1007 end = sc->sc_ebuf; 1008 get = sc->sc_rbget; 1009 scc = cc = scif_rbuf_size - sc->sc_rbavail; 1010 1011 if (cc == scif_rbuf_size) { 1012 sc->sc_floods++; 1013 if (sc->sc_errors++ == 0) 1014 callout_reset(&sc->sc_diag_ch, 60 * hz, scifdiag, sc); 1015 } 1016 1017 while (cc) { 1018 code = get[0]; 1019 ssr2 = get[1]; 1020 if (ISSET(ssr2, SCSSR2_BRK | SCSSR2_FER | SCSSR2_PER)) { 1021 if (ISSET(ssr2, SCSSR2_BRK | SCSSR2_FER)) 1022 SET(code, TTY_FE); 1023 if (ISSET(ssr2, SCSSR2_PER)) 1024 SET(code, TTY_PE); 1025 } 1026 if ((*rint)(code, tp) == -1) { 1027 /* 1028 * The line discipline's buffer is out of space. 1029 */ 1030 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1031 /* 1032 * We're either not using flow control, or the 1033 * line discipline didn't tell us to block for 1034 * some reason. Either way, we have no way to 1035 * know when there's more space available, so 1036 * just drop the rest of the data. 1037 */ 1038 get += cc << 1; 1039 if (get >= end) 1040 get -= scif_rbuf_size << 1; 1041 cc = 0; 1042 } else { 1043 /* 1044 * Don't schedule any more receive processing 1045 * until the line discipline tells us there's 1046 * space available (through scifhwiflow()). 1047 * Leave the rest of the data in the input 1048 * buffer. 1049 */ 1050 SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1051 } 1052 break; 1053 } 1054 get += 2; 1055 if (get >= end) 1056 get = sc->sc_rbuf; 1057 cc--; 1058 } 1059 1060 if (cc != scc) { 1061 sc->sc_rbget = get; 1062 s = splserial(); 1063 cc = sc->sc_rbavail += scc - cc; 1064 /* Buffers should be ok again, release possible block. */ 1065 if (cc >= sc->sc_r_lowat) { 1066 if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1067 CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1068 scif_scr_write(scif_scr_read() | SCSCR2_RIE); 1069 } 1070 #if 0 1071 if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) { 1072 CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1073 scif_hwiflow(sc); 1074 } 1075 #endif 1076 } 1077 splx(s); 1078 } 1079 } 1080 1081 static void 1082 scif_txsoft(struct scif_softc *sc, struct tty *tp) 1083 { 1084 1085 CLR(tp->t_state, TS_BUSY); 1086 if (ISSET(tp->t_state, TS_FLUSH)) 1087 CLR(tp->t_state, TS_FLUSH); 1088 else 1089 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf)); 1090 (*tp->t_linesw->l_start)(tp); 1091 } 1092 1093 #if 0 /* XXX (msaitoh) */ 1094 static void 1095 scif_stsoft(struct scif_softc *sc, struct tty *tp) 1096 { 1097 u_char msr, delta; 1098 int s; 1099 1100 s = splserial(); 1101 msr = sc->sc_msr; 1102 delta = sc->sc_msr_delta; 1103 sc->sc_msr_delta = 0; 1104 splx(s); 1105 1106 if (ISSET(delta, sc->sc_msr_dcd)) { 1107 /* 1108 * Inform the tty layer that carrier detect changed. 1109 */ 1110 (void) (*tp->t_linesw->l_modem)(tp, ISSET(msr, MSR_DCD)); 1111 } 1112 1113 if (ISSET(delta, sc->sc_msr_cts)) { 1114 /* Block or unblock output according to flow control. */ 1115 if (ISSET(msr, sc->sc_msr_cts)) { 1116 sc->sc_tx_stopped = 0; 1117 (*tp->t_linesw->l_start)(tp); 1118 } else { 1119 sc->sc_tx_stopped = 1; 1120 } 1121 } 1122 1123 #ifdef SCIF_DEBUG 1124 if (scif_debug) 1125 scifstatus(sc, "scif_stsoft"); 1126 #endif 1127 } 1128 #endif /* 0 */ 1129 1130 static void 1131 scifsoft(void *arg) 1132 { 1133 struct scif_softc *sc = arg; 1134 struct tty *tp; 1135 1136 if (!device_is_active(&sc->sc_dev)) 1137 return; 1138 1139 tp = sc->sc_tty; 1140 1141 if (sc->sc_rx_ready) { 1142 sc->sc_rx_ready = 0; 1143 scif_rxsoft(sc, tp); 1144 } 1145 1146 #if 0 1147 if (sc->sc_st_check) { 1148 sc->sc_st_check = 0; 1149 scif_stsoft(sc, tp); 1150 } 1151 #endif 1152 1153 if (sc->sc_tx_done) { 1154 sc->sc_tx_done = 0; 1155 scif_txsoft(sc, tp); 1156 } 1157 } 1158 1159 static int 1160 scifintr(void *arg) 1161 { 1162 struct scif_softc *sc = arg; 1163 u_char *put, *end; 1164 u_int cc; 1165 u_short ssr2; 1166 int count; 1167 1168 if (!device_is_active(&sc->sc_dev)) 1169 return (0); 1170 1171 end = sc->sc_ebuf; 1172 put = sc->sc_rbput; 1173 cc = sc->sc_rbavail; 1174 1175 do { 1176 ssr2 = scif_ssr_read(); 1177 if (ISSET(ssr2, SCSSR2_BRK)) { 1178 scif_ssr_write(scif_ssr_read() 1179 & ~(SCSSR2_ER | SCSSR2_BRK | SCSSR2_DR)); 1180 #ifdef DDB 1181 if (ISSET(sc->sc_hwflags, SCIF_HW_CONSOLE)) { 1182 console_debugger(); 1183 } 1184 #endif /* DDB */ 1185 #ifdef KGDB 1186 if (ISSET(sc->sc_hwflags, SCIF_HW_KGDB)) { 1187 kgdb_connect(1); 1188 } 1189 #endif /* KGDB */ 1190 } 1191 count = scif_fdr_read() & SCFDR2_RECVCNT; 1192 if (count != 0) { 1193 for (;;) { 1194 u_char c = scif_frdr_read(); 1195 u_char err = (u_char)(scif_ssr_read() & 0x00ff); 1196 1197 scif_ssr_write(scif_ssr_read() 1198 & ~(SCSSR2_ER | SCSSR2_RDF | SCSSR2_DR)); 1199 #ifdef SH4 1200 if (CPU_IS_SH4) 1201 scif_lsr_write(scif_lsr_read() 1202 & ~SCLSR2_ORER); 1203 #endif 1204 if ((cc > 0) && (count > 0)) { 1205 put[0] = c; 1206 put[1] = err; 1207 put += 2; 1208 if (put >= end) 1209 put = sc->sc_rbuf; 1210 cc--; 1211 count--; 1212 } else 1213 break; 1214 } 1215 1216 /* 1217 * Current string of incoming characters ended because 1218 * no more data was available or we ran out of space. 1219 * Schedule a receive event if any data was received. 1220 * If we're out of space, turn off receive interrupts. 1221 */ 1222 sc->sc_rbput = put; 1223 sc->sc_rbavail = cc; 1224 if (!ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) 1225 sc->sc_rx_ready = 1; 1226 1227 /* 1228 * See if we are in danger of overflowing a buffer. If 1229 * so, use hardware flow control to ease the pressure. 1230 */ 1231 if (!ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED) && 1232 cc < sc->sc_r_hiwat) { 1233 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1234 #if 0 1235 scif_hwiflow(sc); 1236 #endif 1237 } 1238 1239 /* 1240 * If we're out of space, disable receive interrupts 1241 * until the queue has drained a bit. 1242 */ 1243 if (!cc) { 1244 SET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1245 scif_scr_write(scif_scr_read() & ~SCSCR2_RIE); 1246 } 1247 } else { 1248 if (scif_ssr_read() & (SCSSR2_RDF | SCSSR2_DR)) { 1249 scif_scr_write(scif_scr_read() 1250 & ~(SCSCR2_TIE | SCSCR2_RIE)); 1251 delay(10); 1252 scif_scr_write(scif_scr_read() 1253 | SCSCR2_TIE | SCSCR2_RIE); 1254 continue; 1255 } 1256 } 1257 } while (scif_ssr_read() & (SCSSR2_RDF | SCSSR2_DR)); 1258 1259 #if 0 1260 msr = bus_space_read_1(iot, ioh, scif_msr); 1261 delta = msr ^ sc->sc_msr; 1262 sc->sc_msr = msr; 1263 if (ISSET(delta, sc->sc_msr_mask)) { 1264 SET(sc->sc_msr_delta, delta); 1265 1266 /* 1267 * Pulse-per-second clock signal on edge of DCD? 1268 */ 1269 if (ISSET(delta, sc->sc_ppsmask)) { 1270 struct timeval tv; 1271 if (ISSET(msr, sc->sc_ppsmask) == 1272 sc->sc_ppsassert) { 1273 /* XXX nanotime() */ 1274 microtime(&tv); 1275 TIMEVAL_TO_TIMESPEC(&tv, 1276 &sc->ppsinfo.assert_timestamp); 1277 if (sc->ppsparam.mode & PPS_OFFSETASSERT) { 1278 timespecadd(&sc->ppsinfo.assert_timestamp, 1279 &sc->ppsparam.assert_offset, 1280 &sc->ppsinfo.assert_timestamp); 1281 TIMESPEC_TO_TIMEVAL(&tv, &sc->ppsinfo.assert_timestamp); 1282 } 1283 1284 #ifdef PPS_SYNC 1285 if (sc->ppsparam.mode & PPS_HARDPPSONASSERT) 1286 hardpps(&tv, tv.tv_usec); 1287 #endif 1288 sc->ppsinfo.assert_sequence++; 1289 sc->ppsinfo.current_mode = 1290 sc->ppsparam.mode; 1291 1292 } else if (ISSET(msr, sc->sc_ppsmask) == 1293 sc->sc_ppsclear) { 1294 /* XXX nanotime() */ 1295 microtime(&tv); 1296 TIMEVAL_TO_TIMESPEC(&tv, 1297 &sc->ppsinfo.clear_timestamp); 1298 if (sc->ppsparam.mode & PPS_OFFSETCLEAR) { 1299 timespecadd(&sc->ppsinfo.clear_timestamp, 1300 &sc->ppsparam.clear_offset, 1301 &sc->ppsinfo.clear_timestamp); 1302 TIMESPEC_TO_TIMEVAL(&tv, &sc->ppsinfo.clear_timestamp); 1303 } 1304 1305 #ifdef PPS_SYNC 1306 if (sc->ppsparam.mode & PPS_HARDPPSONCLEAR) 1307 hardpps(&tv, tv.tv_usec); 1308 #endif 1309 sc->ppsinfo.clear_sequence++; 1310 sc->ppsinfo.current_mode = 1311 sc->ppsparam.mode; 1312 } 1313 } 1314 1315 /* 1316 * Stop output immediately if we lose the output 1317 * flow control signal or carrier detect. 1318 */ 1319 if (ISSET(~msr, sc->sc_msr_mask)) { 1320 sc->sc_tbc = 0; 1321 sc->sc_heldtbc = 0; 1322 #ifdef SCIF_DEBUG 1323 if (scif_debug) 1324 scifstatus(sc, "scifintr "); 1325 #endif 1326 } 1327 1328 sc->sc_st_check = 1; 1329 } 1330 #endif 1331 1332 /* 1333 * Done handling any receive interrupts. See if data can be 1334 * transmitted as well. Schedule tx done event if no data left 1335 * and tty was marked busy. 1336 */ 1337 if (((scif_fdr_read() & SCFDR2_TXCNT) >> 8) != 16) { /* XXX (msaitoh) */ 1338 /* 1339 * If we've delayed a parameter change, do it now, and restart 1340 * output. 1341 */ 1342 if (sc->sc_heldchange) { 1343 sc->sc_heldchange = 0; 1344 sc->sc_tbc = sc->sc_heldtbc; 1345 sc->sc_heldtbc = 0; 1346 } 1347 1348 /* Output the next chunk of the contiguous buffer, if any. */ 1349 if (sc->sc_tbc > 0) { 1350 int n; 1351 int maxchars; 1352 int i; 1353 1354 n = sc->sc_tbc; 1355 maxchars = sc->sc_fifolen - 1356 ((scif_fdr_read() & SCFDR2_TXCNT) >> 8); 1357 if (n > maxchars) 1358 n = maxchars; 1359 1360 for (i = 0; i < n; i++) { 1361 scif_putc(*(sc->sc_tba)); 1362 sc->sc_tba++; 1363 } 1364 sc->sc_tbc -= n; 1365 } else { 1366 /* Disable transmit completion interrupts if necessary. */ 1367 #if 0 1368 if (ISSET(sc->sc_ier, IER_ETXRDY)) 1369 #endif 1370 scif_scr_write(scif_scr_read() & ~SCSCR2_TIE); 1371 1372 if (sc->sc_tx_busy) { 1373 sc->sc_tx_busy = 0; 1374 sc->sc_tx_done = 1; 1375 } 1376 } 1377 } 1378 1379 /* Wake up the poller. */ 1380 softint_schedule(sc->sc_si); 1381 1382 #if NRND > 0 && defined(RND_SCIF) 1383 rnd_add_uint32(&sc->rnd_source, iir | lsr); 1384 #endif 1385 1386 return (1); 1387 } 1388 1389 void 1390 scifcnprobe(struct consdev *cp) 1391 { 1392 int maj; 1393 1394 /* locate the major number */ 1395 maj = cdevsw_lookup_major(&scif_cdevsw); 1396 1397 /* Initialize required fields. */ 1398 cp->cn_dev = makedev(maj, 0); 1399 #ifdef SCIFCONSOLE 1400 cp->cn_pri = CN_REMOTE; 1401 #else 1402 cp->cn_pri = CN_NORMAL; 1403 #endif 1404 } 1405 1406 void 1407 scifcninit(struct consdev *cp) 1408 { 1409 1410 InitializeScif(scifcn_speed); 1411 scifisconsole = 1; 1412 } 1413 1414 int 1415 scifcngetc(dev_t dev) 1416 { 1417 int c; 1418 int s; 1419 1420 s = splserial(); 1421 c = scif_getc(); 1422 splx(s); 1423 1424 return (c); 1425 } 1426 1427 void 1428 scifcnputc(dev_t dev, int c) 1429 { 1430 int s; 1431 1432 s = splserial(); 1433 scif_putc((u_char)c); 1434 splx(s); 1435 } 1436 1437 #ifdef KGDB 1438 int 1439 scif_kgdb_init() 1440 { 1441 1442 if (strcmp(kgdb_devname, "scif") != 0) 1443 return (1); 1444 1445 if (scifisconsole) 1446 return (1); /* can't share with console */ 1447 1448 InitializeScif(kgdb_rate); 1449 1450 kgdb_attach((int (*)(void *))scifcngetc, 1451 (void (*)(void *, int))scifcnputc, NULL); 1452 kgdb_dev = 123; /* unneeded, only to satisfy some tests */ 1453 kgdb_attached = 1; 1454 1455 return (0); 1456 } 1457 #endif /* KGDB */ 1458