scif.c revision 1.56
1 /* $NetBSD: scif.c,v 1.56 2008/03/27 01:48:50 uwe 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 1.56 2008/03/27 01:48:50 uwe 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 device_t sc_dev; 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, cfdata_t, void *); 188 static void scif_attach(device_t, device_t, void *); 189 190 CFATTACH_DECL_NEW(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, cfdata_t 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; 435 struct tty *tp; 436 437 sc = device_private(self); 438 sc->sc_dev = self; 439 440 scif_attached = 1; 441 442 sc->sc_hwflags = 0; /* XXX */ 443 sc->sc_swflags = 0; /* XXX */ 444 sc->sc_fifolen = 16; 445 446 aprint_normal("\n"); 447 if (scifisconsole) { 448 aprint_naive(" (console)\n"); 449 aprint_normal_dev(self, "console\n"); 450 SET(sc->sc_hwflags, SCIF_HW_CONSOLE); 451 SET(sc->sc_swflags, TIOCFLAG_SOFTCAR); 452 } 453 #ifdef KGDB 454 else if (kgdb_attached) { 455 aprint_naive(" (kgdb)\n"); 456 aprint_normal_dev(self, "kgdb\n"); 457 SET(sc->sc_hwflags, SCIF_HW_KGDB); 458 SET(sc->sc_swflags, TIOCFLAG_SOFTCAR); 459 } 460 #endif 461 else { 462 aprint_naive("\n"); 463 InitializeScif(9600); /* XXX */ 464 } 465 466 callout_init(&sc->sc_diag_ch, 0); 467 #ifdef SH4 468 intc_intr_establish(SH4_INTEVT_SCIF_ERI, IST_LEVEL, IPL_SERIAL, 469 scifintr, sc); 470 intc_intr_establish(SH4_INTEVT_SCIF_RXI, IST_LEVEL, IPL_SERIAL, 471 scifintr, sc); 472 intc_intr_establish(SH4_INTEVT_SCIF_BRI, IST_LEVEL, IPL_SERIAL, 473 scifintr, sc); 474 intc_intr_establish(SH4_INTEVT_SCIF_TXI, IST_LEVEL, IPL_SERIAL, 475 scifintr, sc); 476 #else 477 intc_intr_establish(SH7709_INTEVT2_SCIF_ERI, IST_LEVEL, IPL_SERIAL, 478 scifintr, sc); 479 intc_intr_establish(SH7709_INTEVT2_SCIF_RXI, IST_LEVEL, IPL_SERIAL, 480 scifintr, sc); 481 intc_intr_establish(SH7709_INTEVT2_SCIF_BRI, IST_LEVEL, IPL_SERIAL, 482 scifintr, sc); 483 intc_intr_establish(SH7709_INTEVT2_SCIF_TXI, IST_LEVEL, IPL_SERIAL, 484 scifintr, sc); 485 #endif 486 487 sc->sc_si = softint_establish(SOFTINT_SERIAL, scifsoft, sc); 488 SET(sc->sc_hwflags, SCIF_HW_DEV_OK); 489 490 tp = ttymalloc(); 491 tp->t_oproc = scifstart; 492 tp->t_param = scifparam; 493 tp->t_hwiflow = NULL; 494 495 sc->sc_tty = tp; 496 sc->sc_rbuf = malloc(scif_rbuf_size << 1, M_DEVBUF, M_NOWAIT); 497 if (sc->sc_rbuf == NULL) { 498 aprint_error_dev(self, "unable to allocate ring buffer\n"); 499 return; 500 } 501 sc->sc_ebuf = sc->sc_rbuf + (scif_rbuf_size << 1); 502 503 tty_attach(tp); 504 } 505 506 /* 507 * Start or restart transmission. 508 */ 509 static void 510 scifstart(struct tty *tp) 511 { 512 struct scif_softc *sc; 513 int s; 514 515 sc = device_lookup_private(&scif_cd, SCIFUNIT(tp->t_dev)); 516 517 s = spltty(); 518 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 519 goto out; 520 if (sc->sc_tx_stopped) 521 goto out; 522 if (!ttypull(tp)) 523 goto out; 524 525 /* Grab the first contiguous region of buffer space. */ 526 { 527 u_char *tba; 528 int tbc; 529 530 tba = tp->t_outq.c_cf; 531 tbc = ndqb(&tp->t_outq, 0); 532 533 (void)splserial(); 534 535 sc->sc_tba = tba; 536 sc->sc_tbc = tbc; 537 } 538 539 SET(tp->t_state, TS_BUSY); 540 sc->sc_tx_busy = 1; 541 542 /* Enable transmit completion interrupts if necessary. */ 543 scif_scr_write(scif_scr_read() | SCSCR2_TIE | SCSCR2_RIE); 544 545 /* Output the first chunk of the contiguous buffer. */ 546 { 547 int n; 548 int maxchars; 549 int i; 550 551 n = sc->sc_tbc; 552 maxchars = sc->sc_fifolen 553 - ((scif_fdr_read() & SCFDR2_TXCNT) >> 8); 554 if (n > maxchars) 555 n = maxchars; 556 557 for (i = 0; i < n; i++) { 558 scif_putc(*(sc->sc_tba)); 559 sc->sc_tba++; 560 } 561 sc->sc_tbc -= n; 562 } 563 out: 564 splx(s); 565 return; 566 } 567 568 /* 569 * Set SCIF tty parameters from termios. 570 * XXX - Should just copy the whole termios after 571 * making sure all the changes could be done. 572 */ 573 static int 574 scifparam(struct tty *tp, struct termios *t) 575 { 576 struct scif_softc *sc; 577 int ospeed = t->c_ospeed; 578 int s; 579 580 sc = device_lookup_private(&scif_cd, SCIFUNIT(tp->t_dev)); 581 if (!device_is_active(sc->sc_dev)) 582 return (EIO); 583 584 /* Check requested parameters. */ 585 if (ospeed < 0) 586 return (EINVAL); 587 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 588 return (EINVAL); 589 590 /* 591 * For the console, always force CLOCAL and !HUPCL, so that the port 592 * is always active. 593 */ 594 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) || 595 ISSET(sc->sc_hwflags, SCIF_HW_CONSOLE)) { 596 SET(t->c_cflag, CLOCAL); 597 CLR(t->c_cflag, HUPCL); 598 } 599 600 /* 601 * If there were no changes, don't do anything. This avoids dropping 602 * input and improves performance when all we did was frob things like 603 * VMIN and VTIME. 604 */ 605 if (tp->t_ospeed == t->c_ospeed && 606 tp->t_cflag == t->c_cflag) 607 return (0); 608 609 #if 0 610 /* XXX (msaitoh) */ 611 lcr = ISSET(sc->sc_lcr, LCR_SBREAK) | cflag2lcr(t->c_cflag); 612 #endif 613 614 s = splserial(); 615 616 /* 617 * Set the flow control pins depending on the current flow control 618 * mode. 619 */ 620 if (ISSET(t->c_cflag, CRTSCTS)) { 621 scif_fcr_write(scif_fcr_read() | SCFCR2_MCE); 622 } else { 623 scif_fcr_write(scif_fcr_read() & ~SCFCR2_MCE); 624 } 625 626 scif_brr_write(divrnd(sh_clock_get_pclock(), 32 * ospeed) -1); 627 628 /* 629 * Set the FIFO threshold based on the receive speed. 630 * 631 * * If it's a low speed, it's probably a mouse or some other 632 * interactive device, so set the threshold low. 633 * * If it's a high speed, trim the trigger level down to prevent 634 * overflows. 635 * * Otherwise set it a bit higher. 636 */ 637 #if 0 638 /* XXX (msaitoh) */ 639 if (ISSET(sc->sc_hwflags, SCIF_HW_HAYESP)) 640 sc->sc_fifo = FIFO_DMA_MODE | FIFO_ENABLE | FIFO_TRIGGER_8; 641 else if (ISSET(sc->sc_hwflags, SCIF_HW_FIFO)) 642 sc->sc_fifo = FIFO_ENABLE | 643 (t->c_ospeed <= 1200 ? FIFO_TRIGGER_1 : 644 t->c_ospeed <= 38400 ? FIFO_TRIGGER_8 : FIFO_TRIGGER_4); 645 else 646 sc->sc_fifo = 0; 647 #endif 648 649 /* And copy to tty. */ 650 tp->t_ispeed = 0; 651 tp->t_ospeed = t->c_ospeed; 652 tp->t_cflag = t->c_cflag; 653 654 if (!sc->sc_heldchange) { 655 if (sc->sc_tx_busy) { 656 sc->sc_heldtbc = sc->sc_tbc; 657 sc->sc_tbc = 0; 658 sc->sc_heldchange = 1; 659 } 660 #if 0 661 /* XXX (msaitoh) */ 662 else 663 scif_loadchannelregs(sc); 664 #endif 665 } 666 667 if (!ISSET(t->c_cflag, CHWFLOW)) { 668 /* Disable the high water mark. */ 669 sc->sc_r_hiwat = 0; 670 sc->sc_r_lowat = 0; 671 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 672 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 673 scif_schedrx(sc); 674 } 675 } else { 676 sc->sc_r_hiwat = scif_rbuf_hiwat; 677 sc->sc_r_lowat = scif_rbuf_lowat; 678 } 679 680 splx(s); 681 682 #ifdef SCIF_DEBUG 683 if (scif_debug) 684 scifstatus(sc, "scifparam "); 685 #endif 686 687 if (!ISSET(t->c_cflag, CHWFLOW)) { 688 if (sc->sc_tx_stopped) { 689 sc->sc_tx_stopped = 0; 690 scifstart(tp); 691 } 692 } 693 694 return (0); 695 } 696 697 static void 698 scif_iflush(struct scif_softc *sc) 699 { 700 int i; 701 unsigned char c; 702 703 i = scif_fdr_read() & SCFDR2_RECVCNT; 704 705 while (i > 0) { 706 c = scif_frdr_read(); 707 scif_ssr_write(scif_ssr_read() & ~(SCSSR2_RDF | SCSSR2_DR)); 708 i--; 709 } 710 } 711 712 int 713 scifopen(dev_t dev, int flag, int mode, struct lwp *l) 714 { 715 struct scif_softc *sc; 716 struct tty *tp; 717 int s, s2; 718 int error; 719 720 sc = device_lookup_private(&scif_cd, SCIFUNIT(dev)); 721 if (sc == 0 || !ISSET(sc->sc_hwflags, SCIF_HW_DEV_OK) || 722 sc->sc_rbuf == NULL) 723 return (ENXIO); 724 725 if (!device_is_active(sc->sc_dev)) 726 return (ENXIO); 727 728 #ifdef KGDB 729 /* 730 * If this is the kgdb port, no other use is permitted. 731 */ 732 if (ISSET(sc->sc_hwflags, SCIF_HW_KGDB)) 733 return (EBUSY); 734 #endif /* KGDB */ 735 736 tp = sc->sc_tty; 737 738 if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp)) 739 return (EBUSY); 740 741 s = spltty(); 742 743 /* 744 * Do the following iff this is a first open. 745 */ 746 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 747 struct termios t; 748 749 tp->t_dev = dev; 750 751 s2 = splserial(); 752 753 /* Turn on interrupts. */ 754 scif_scr_write(scif_scr_read() | SCSCR2_TIE | SCSCR2_RIE); 755 756 splx(s2); 757 758 /* 759 * Initialize the termios status to the defaults. Add in the 760 * sticky bits from TIOCSFLAGS. 761 */ 762 t.c_ispeed = 0; 763 if (ISSET(sc->sc_hwflags, SCIF_HW_CONSOLE)) { 764 t.c_ospeed = scifcn_speed; /* XXX (msaitoh) */ 765 t.c_cflag = scifconscflag; 766 } else { 767 t.c_ospeed = TTYDEF_SPEED; 768 t.c_cflag = TTYDEF_CFLAG; 769 } 770 if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL)) 771 SET(t.c_cflag, CLOCAL); 772 if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)) 773 SET(t.c_cflag, CRTSCTS); 774 if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF)) 775 SET(t.c_cflag, MDMBUF); 776 /* Make sure scifparam() will do something. */ 777 tp->t_ospeed = 0; 778 (void) scifparam(tp, &t); 779 tp->t_iflag = TTYDEF_IFLAG; 780 tp->t_oflag = TTYDEF_OFLAG; 781 tp->t_lflag = TTYDEF_LFLAG; 782 ttychars(tp); 783 ttsetwater(tp); 784 785 s2 = splserial(); 786 787 /* Clear the input ring, and unblock. */ 788 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 789 sc->sc_rbavail = scif_rbuf_size; 790 scif_iflush(sc); 791 CLR(sc->sc_rx_flags, RX_ANY_BLOCK); 792 #if 0 793 /* XXX (msaitoh) */ 794 scif_hwiflow(sc); 795 #endif 796 797 #ifdef SCIF_DEBUG 798 if (scif_debug) 799 scifstatus(sc, "scifopen "); 800 #endif 801 802 splx(s2); 803 } 804 805 splx(s); 806 807 error = ttyopen(tp, SCIFDIALOUT(dev), ISSET(flag, O_NONBLOCK)); 808 if (error) 809 goto bad; 810 811 error = (*tp->t_linesw->l_open)(dev, tp); 812 if (error) 813 goto bad; 814 815 return (0); 816 817 bad: 818 819 return (error); 820 } 821 822 int 823 scifclose(dev_t dev, int flag, int mode, struct lwp *l) 824 { 825 struct scif_softc *sc; 826 struct tty *tp; 827 828 sc = device_lookup_private(&scif_cd, SCIFUNIT(dev)); 829 tp = sc->sc_tty; 830 831 /* XXX This is for cons.c. */ 832 if (!ISSET(tp->t_state, TS_ISOPEN)) 833 return (0); 834 835 (*tp->t_linesw->l_close)(tp, flag); 836 ttyclose(tp); 837 838 if (!device_is_active(sc->sc_dev)) 839 return (0); 840 841 return (0); 842 } 843 844 int 845 scifread(dev_t dev, struct uio *uio, int flag) 846 { 847 struct scif_softc *sc; 848 struct tty *tp; 849 850 sc = device_lookup_private(&scif_cd, SCIFUNIT(dev)); 851 tp = sc->sc_tty; 852 853 return ((*tp->t_linesw->l_read)(tp, uio, flag)); 854 } 855 856 int 857 scifwrite(dev_t dev, struct uio *uio, int flag) 858 { 859 struct scif_softc *sc; 860 struct tty *tp; 861 862 sc = device_lookup_private(&scif_cd, SCIFUNIT(dev)); 863 tp = sc->sc_tty; 864 865 return ((*tp->t_linesw->l_write)(tp, uio, flag)); 866 } 867 868 int 869 scifpoll(dev_t dev, int events, struct lwp *l) 870 { 871 struct scif_softc *sc; 872 struct tty *tp; 873 874 sc = device_lookup_private(&scif_cd, SCIFUNIT(dev)); 875 tp = sc->sc_tty; 876 877 return ((*tp->t_linesw->l_poll)(tp, events, l)); 878 } 879 880 struct tty * 881 sciftty(dev_t dev) 882 { 883 struct scif_softc *sc; 884 struct tty *tp; 885 886 sc = device_lookup_private(&scif_cd, SCIFUNIT(dev)); 887 tp = sc->sc_tty; 888 889 return (tp); 890 } 891 892 int 893 scifioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 894 { 895 struct scif_softc *sc; 896 struct tty *tp; 897 int error; 898 int s; 899 900 sc = device_lookup_private(&scif_cd, SCIFUNIT(dev)); 901 if (!device_is_active(sc->sc_dev)) 902 return (EIO); 903 904 tp = sc->sc_tty; 905 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 906 if (error != EPASSTHROUGH) 907 return (error); 908 909 error = ttioctl(tp, cmd, data, flag, l); 910 if (error != EPASSTHROUGH) 911 return (error); 912 913 error = 0; 914 915 s = splserial(); 916 917 switch (cmd) { 918 case TIOCSBRK: 919 scif_break(sc, 1); 920 break; 921 922 case TIOCCBRK: 923 scif_break(sc, 0); 924 break; 925 926 case TIOCGFLAGS: 927 *(int *)data = sc->sc_swflags; 928 break; 929 930 case TIOCSFLAGS: 931 error = kauth_authorize_device_tty(l->l_cred, 932 KAUTH_DEVICE_TTY_PRIVSET, tp); 933 if (error) 934 break; 935 sc->sc_swflags = *(int *)data; 936 break; 937 938 default: 939 error = EPASSTHROUGH; 940 break; 941 } 942 943 splx(s); 944 945 return (error); 946 } 947 948 static void 949 scif_schedrx(struct scif_softc *sc) 950 { 951 952 sc->sc_rx_ready = 1; 953 954 /* Wake up the poller. */ 955 softint_schedule(sc->sc_si); 956 } 957 958 static void 959 scif_break(struct scif_softc *sc, int onoff) 960 { 961 962 if (onoff) 963 scif_ssr_write(scif_ssr_read() & ~SCSSR2_TDFE); 964 else 965 scif_ssr_write(scif_ssr_read() | SCSSR2_TDFE); 966 967 #if 0 /* XXX */ 968 if (!sc->sc_heldchange) { 969 if (sc->sc_tx_busy) { 970 sc->sc_heldtbc = sc->sc_tbc; 971 sc->sc_tbc = 0; 972 sc->sc_heldchange = 1; 973 } else 974 scif_loadchannelregs(sc); 975 } 976 #endif 977 } 978 979 /* 980 * Stop output, e.g., for ^S or output flush. 981 */ 982 void 983 scifstop(struct tty *tp, int flag) 984 { 985 struct scif_softc *sc; 986 int s; 987 988 sc = device_lookup_private(&scif_cd, SCIFUNIT(tp->t_dev)); 989 990 s = splserial(); 991 if (ISSET(tp->t_state, TS_BUSY)) { 992 /* Stop transmitting at the next chunk. */ 993 sc->sc_tbc = 0; 994 sc->sc_heldtbc = 0; 995 if (!ISSET(tp->t_state, TS_TTSTOP)) 996 SET(tp->t_state, TS_FLUSH); 997 } 998 splx(s); 999 } 1000 1001 static void 1002 scifdiag(void *arg) 1003 { 1004 struct scif_softc *sc = arg; 1005 int overflows, floods; 1006 int s; 1007 1008 s = splserial(); 1009 overflows = sc->sc_overflows; 1010 sc->sc_overflows = 0; 1011 floods = sc->sc_floods; 1012 sc->sc_floods = 0; 1013 sc->sc_errors = 0; 1014 splx(s); 1015 1016 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1017 device_xname(sc->sc_dev), 1018 overflows, overflows == 1 ? "" : "s", 1019 floods, floods == 1 ? "" : "s"); 1020 } 1021 1022 static void 1023 scif_rxsoft(struct scif_softc *sc, struct tty *tp) 1024 { 1025 int (*rint)(int, struct tty *) = tp->t_linesw->l_rint; 1026 u_char *get, *end; 1027 u_int cc, scc; 1028 u_char ssr2; 1029 int code; 1030 int s; 1031 1032 end = sc->sc_ebuf; 1033 get = sc->sc_rbget; 1034 scc = cc = scif_rbuf_size - sc->sc_rbavail; 1035 1036 if (cc == scif_rbuf_size) { 1037 sc->sc_floods++; 1038 if (sc->sc_errors++ == 0) 1039 callout_reset(&sc->sc_diag_ch, 60 * hz, scifdiag, sc); 1040 } 1041 1042 while (cc) { 1043 code = get[0]; 1044 ssr2 = get[1]; 1045 if (ISSET(ssr2, SCSSR2_BRK | SCSSR2_FER | SCSSR2_PER)) { 1046 if (ISSET(ssr2, SCSSR2_BRK | SCSSR2_FER)) 1047 SET(code, TTY_FE); 1048 if (ISSET(ssr2, SCSSR2_PER)) 1049 SET(code, TTY_PE); 1050 } 1051 if ((*rint)(code, tp) == -1) { 1052 /* 1053 * The line discipline's buffer is out of space. 1054 */ 1055 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1056 /* 1057 * We're either not using flow control, or the 1058 * line discipline didn't tell us to block for 1059 * some reason. Either way, we have no way to 1060 * know when there's more space available, so 1061 * just drop the rest of the data. 1062 */ 1063 get += cc << 1; 1064 if (get >= end) 1065 get -= scif_rbuf_size << 1; 1066 cc = 0; 1067 } else { 1068 /* 1069 * Don't schedule any more receive processing 1070 * until the line discipline tells us there's 1071 * space available (through scifhwiflow()). 1072 * Leave the rest of the data in the input 1073 * buffer. 1074 */ 1075 SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1076 } 1077 break; 1078 } 1079 get += 2; 1080 if (get >= end) 1081 get = sc->sc_rbuf; 1082 cc--; 1083 } 1084 1085 if (cc != scc) { 1086 sc->sc_rbget = get; 1087 s = splserial(); 1088 cc = sc->sc_rbavail += scc - cc; 1089 /* Buffers should be ok again, release possible block. */ 1090 if (cc >= sc->sc_r_lowat) { 1091 if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1092 CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1093 scif_scr_write(scif_scr_read() | SCSCR2_RIE); 1094 } 1095 #if 0 1096 if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) { 1097 CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1098 scif_hwiflow(sc); 1099 } 1100 #endif 1101 } 1102 splx(s); 1103 } 1104 } 1105 1106 static void 1107 scif_txsoft(struct scif_softc *sc, struct tty *tp) 1108 { 1109 1110 CLR(tp->t_state, TS_BUSY); 1111 if (ISSET(tp->t_state, TS_FLUSH)) 1112 CLR(tp->t_state, TS_FLUSH); 1113 else 1114 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf)); 1115 (*tp->t_linesw->l_start)(tp); 1116 } 1117 1118 #if 0 /* XXX (msaitoh) */ 1119 static void 1120 scif_stsoft(struct scif_softc *sc, struct tty *tp) 1121 { 1122 u_char msr, delta; 1123 int s; 1124 1125 s = splserial(); 1126 msr = sc->sc_msr; 1127 delta = sc->sc_msr_delta; 1128 sc->sc_msr_delta = 0; 1129 splx(s); 1130 1131 if (ISSET(delta, sc->sc_msr_dcd)) { 1132 /* 1133 * Inform the tty layer that carrier detect changed. 1134 */ 1135 (void) (*tp->t_linesw->l_modem)(tp, ISSET(msr, MSR_DCD)); 1136 } 1137 1138 if (ISSET(delta, sc->sc_msr_cts)) { 1139 /* Block or unblock output according to flow control. */ 1140 if (ISSET(msr, sc->sc_msr_cts)) { 1141 sc->sc_tx_stopped = 0; 1142 (*tp->t_linesw->l_start)(tp); 1143 } else { 1144 sc->sc_tx_stopped = 1; 1145 } 1146 } 1147 1148 #ifdef SCIF_DEBUG 1149 if (scif_debug) 1150 scifstatus(sc, "scif_stsoft"); 1151 #endif 1152 } 1153 #endif /* 0 */ 1154 1155 static void 1156 scifsoft(void *arg) 1157 { 1158 struct scif_softc *sc = arg; 1159 struct tty *tp; 1160 1161 if (!device_is_active(sc->sc_dev)) 1162 return; 1163 1164 tp = sc->sc_tty; 1165 1166 if (sc->sc_rx_ready) { 1167 sc->sc_rx_ready = 0; 1168 scif_rxsoft(sc, tp); 1169 } 1170 1171 #if 0 1172 if (sc->sc_st_check) { 1173 sc->sc_st_check = 0; 1174 scif_stsoft(sc, tp); 1175 } 1176 #endif 1177 1178 if (sc->sc_tx_done) { 1179 sc->sc_tx_done = 0; 1180 scif_txsoft(sc, tp); 1181 } 1182 } 1183 1184 static int 1185 scifintr(void *arg) 1186 { 1187 struct scif_softc *sc = arg; 1188 u_char *put, *end; 1189 u_int cc; 1190 u_short ssr2; 1191 int count; 1192 1193 if (!device_is_active(sc->sc_dev)) 1194 return (0); 1195 1196 end = sc->sc_ebuf; 1197 put = sc->sc_rbput; 1198 cc = sc->sc_rbavail; 1199 1200 do { 1201 ssr2 = scif_ssr_read(); 1202 if (ISSET(ssr2, SCSSR2_BRK)) { 1203 scif_ssr_write(scif_ssr_read() 1204 & ~(SCSSR2_ER | SCSSR2_BRK | SCSSR2_DR)); 1205 #ifdef DDB 1206 if (ISSET(sc->sc_hwflags, SCIF_HW_CONSOLE)) { 1207 console_debugger(); 1208 } 1209 #endif /* DDB */ 1210 #ifdef KGDB 1211 if (ISSET(sc->sc_hwflags, SCIF_HW_KGDB)) { 1212 kgdb_connect(1); 1213 } 1214 #endif /* KGDB */ 1215 } 1216 count = scif_fdr_read() & SCFDR2_RECVCNT; 1217 if (count != 0) { 1218 for (;;) { 1219 u_char c = scif_frdr_read(); 1220 u_char err = (u_char)(scif_ssr_read() & 0x00ff); 1221 1222 scif_ssr_write(scif_ssr_read() 1223 & ~(SCSSR2_ER | SCSSR2_RDF | SCSSR2_DR)); 1224 #ifdef SH4 1225 if (CPU_IS_SH4) 1226 scif_lsr_write(scif_lsr_read() 1227 & ~SCLSR2_ORER); 1228 #endif 1229 if ((cc > 0) && (count > 0)) { 1230 put[0] = c; 1231 put[1] = err; 1232 put += 2; 1233 if (put >= end) 1234 put = sc->sc_rbuf; 1235 cc--; 1236 count--; 1237 } else 1238 break; 1239 } 1240 1241 /* 1242 * Current string of incoming characters ended because 1243 * no more data was available or we ran out of space. 1244 * Schedule a receive event if any data was received. 1245 * If we're out of space, turn off receive interrupts. 1246 */ 1247 sc->sc_rbput = put; 1248 sc->sc_rbavail = cc; 1249 if (!ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) 1250 sc->sc_rx_ready = 1; 1251 1252 /* 1253 * See if we are in danger of overflowing a buffer. If 1254 * so, use hardware flow control to ease the pressure. 1255 */ 1256 if (!ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED) && 1257 cc < sc->sc_r_hiwat) { 1258 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1259 #if 0 1260 scif_hwiflow(sc); 1261 #endif 1262 } 1263 1264 /* 1265 * If we're out of space, disable receive interrupts 1266 * until the queue has drained a bit. 1267 */ 1268 if (!cc) { 1269 SET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1270 scif_scr_write(scif_scr_read() & ~SCSCR2_RIE); 1271 } 1272 } else { 1273 if (scif_ssr_read() & (SCSSR2_RDF | SCSSR2_DR)) { 1274 scif_scr_write(scif_scr_read() 1275 & ~(SCSCR2_TIE | SCSCR2_RIE)); 1276 delay(10); 1277 scif_scr_write(scif_scr_read() 1278 | SCSCR2_TIE | SCSCR2_RIE); 1279 continue; 1280 } 1281 } 1282 } while (scif_ssr_read() & (SCSSR2_RDF | SCSSR2_DR)); 1283 1284 #if 0 1285 msr = bus_space_read_1(iot, ioh, scif_msr); 1286 delta = msr ^ sc->sc_msr; 1287 sc->sc_msr = msr; 1288 if (ISSET(delta, sc->sc_msr_mask)) { 1289 SET(sc->sc_msr_delta, delta); 1290 1291 /* 1292 * Pulse-per-second clock signal on edge of DCD? 1293 */ 1294 if (ISSET(delta, sc->sc_ppsmask)) { 1295 struct timeval tv; 1296 if (ISSET(msr, sc->sc_ppsmask) == 1297 sc->sc_ppsassert) { 1298 /* XXX nanotime() */ 1299 microtime(&tv); 1300 TIMEVAL_TO_TIMESPEC(&tv, 1301 &sc->ppsinfo.assert_timestamp); 1302 if (sc->ppsparam.mode & PPS_OFFSETASSERT) { 1303 timespecadd(&sc->ppsinfo.assert_timestamp, 1304 &sc->ppsparam.assert_offset, 1305 &sc->ppsinfo.assert_timestamp); 1306 TIMESPEC_TO_TIMEVAL(&tv, &sc->ppsinfo.assert_timestamp); 1307 } 1308 1309 #ifdef PPS_SYNC 1310 if (sc->ppsparam.mode & PPS_HARDPPSONASSERT) 1311 hardpps(&tv, tv.tv_usec); 1312 #endif 1313 sc->ppsinfo.assert_sequence++; 1314 sc->ppsinfo.current_mode = 1315 sc->ppsparam.mode; 1316 1317 } else if (ISSET(msr, sc->sc_ppsmask) == 1318 sc->sc_ppsclear) { 1319 /* XXX nanotime() */ 1320 microtime(&tv); 1321 TIMEVAL_TO_TIMESPEC(&tv, 1322 &sc->ppsinfo.clear_timestamp); 1323 if (sc->ppsparam.mode & PPS_OFFSETCLEAR) { 1324 timespecadd(&sc->ppsinfo.clear_timestamp, 1325 &sc->ppsparam.clear_offset, 1326 &sc->ppsinfo.clear_timestamp); 1327 TIMESPEC_TO_TIMEVAL(&tv, &sc->ppsinfo.clear_timestamp); 1328 } 1329 1330 #ifdef PPS_SYNC 1331 if (sc->ppsparam.mode & PPS_HARDPPSONCLEAR) 1332 hardpps(&tv, tv.tv_usec); 1333 #endif 1334 sc->ppsinfo.clear_sequence++; 1335 sc->ppsinfo.current_mode = 1336 sc->ppsparam.mode; 1337 } 1338 } 1339 1340 /* 1341 * Stop output immediately if we lose the output 1342 * flow control signal or carrier detect. 1343 */ 1344 if (ISSET(~msr, sc->sc_msr_mask)) { 1345 sc->sc_tbc = 0; 1346 sc->sc_heldtbc = 0; 1347 #ifdef SCIF_DEBUG 1348 if (scif_debug) 1349 scifstatus(sc, "scifintr "); 1350 #endif 1351 } 1352 1353 sc->sc_st_check = 1; 1354 } 1355 #endif 1356 1357 /* 1358 * Done handling any receive interrupts. See if data can be 1359 * transmitted as well. Schedule tx done event if no data left 1360 * and tty was marked busy. 1361 */ 1362 if (((scif_fdr_read() & SCFDR2_TXCNT) >> 8) != 16) { /* XXX (msaitoh) */ 1363 /* 1364 * If we've delayed a parameter change, do it now, and restart 1365 * output. 1366 */ 1367 if (sc->sc_heldchange) { 1368 sc->sc_heldchange = 0; 1369 sc->sc_tbc = sc->sc_heldtbc; 1370 sc->sc_heldtbc = 0; 1371 } 1372 1373 /* Output the next chunk of the contiguous buffer, if any. */ 1374 if (sc->sc_tbc > 0) { 1375 int n; 1376 int maxchars; 1377 int i; 1378 1379 n = sc->sc_tbc; 1380 maxchars = sc->sc_fifolen - 1381 ((scif_fdr_read() & SCFDR2_TXCNT) >> 8); 1382 if (n > maxchars) 1383 n = maxchars; 1384 1385 for (i = 0; i < n; i++) { 1386 scif_putc(*(sc->sc_tba)); 1387 sc->sc_tba++; 1388 } 1389 sc->sc_tbc -= n; 1390 } else { 1391 /* Disable transmit completion interrupts if necessary. */ 1392 #if 0 1393 if (ISSET(sc->sc_ier, IER_ETXRDY)) 1394 #endif 1395 scif_scr_write(scif_scr_read() & ~SCSCR2_TIE); 1396 1397 if (sc->sc_tx_busy) { 1398 sc->sc_tx_busy = 0; 1399 sc->sc_tx_done = 1; 1400 } 1401 } 1402 } 1403 1404 /* Wake up the poller. */ 1405 softint_schedule(sc->sc_si); 1406 1407 #if NRND > 0 && defined(RND_SCIF) 1408 rnd_add_uint32(&sc->rnd_source, iir | lsr); 1409 #endif 1410 1411 return (1); 1412 } 1413 1414 void 1415 scifcnprobe(struct consdev *cp) 1416 { 1417 int maj; 1418 1419 /* locate the major number */ 1420 maj = cdevsw_lookup_major(&scif_cdevsw); 1421 1422 /* Initialize required fields. */ 1423 cp->cn_dev = makedev(maj, 0); 1424 #ifdef SCIFCONSOLE 1425 cp->cn_pri = CN_REMOTE; 1426 #else 1427 cp->cn_pri = CN_NORMAL; 1428 #endif 1429 } 1430 1431 void 1432 scifcninit(struct consdev *cp) 1433 { 1434 1435 InitializeScif(scifcn_speed); 1436 scifisconsole = 1; 1437 } 1438 1439 int 1440 scifcngetc(dev_t dev) 1441 { 1442 int c; 1443 int s; 1444 1445 s = splserial(); 1446 c = scif_getc(); 1447 splx(s); 1448 1449 return (c); 1450 } 1451 1452 void 1453 scifcnputc(dev_t dev, int c) 1454 { 1455 int s; 1456 1457 s = splserial(); 1458 scif_putc((u_char)c); 1459 splx(s); 1460 } 1461 1462 #ifdef KGDB 1463 int 1464 scif_kgdb_init() 1465 { 1466 1467 if (strcmp(kgdb_devname, "scif") != 0) 1468 return (1); 1469 1470 if (scifisconsole) 1471 return (1); /* can't share with console */ 1472 1473 InitializeScif(kgdb_rate); 1474 1475 kgdb_attach((int (*)(void *))scifcngetc, 1476 (void (*)(void *, int))scifcnputc, NULL); 1477 kgdb_dev = 123; /* unneeded, only to satisfy some tests */ 1478 kgdb_attached = 1; 1479 1480 return (0); 1481 } 1482 #endif /* KGDB */ 1483
Indexes created Tue Sep 23 02:09:52 GMT 2025