sci.c revision 1.46.2.3
1 /* $NetBSD: sci.c,v 1.46.2.3 2007/12/03 18:38:52 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: sci.c,v 1.46.2.3 2007/12/03 18:38:52 ad Exp $"); 104 105 #include "opt_kgdb.h" 106 #include "opt_sci.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/kauth.h> 119 #include <sys/intr.h> 120 121 #include <dev/cons.h> 122 123 #include <sh3/clock.h> 124 #include <sh3/scireg.h> 125 #include <sh3/pfcreg.h> 126 #include <sh3/tmureg.h> 127 #include <sh3/exception.h> 128 129 static void scistart(struct tty *); 130 static int sciparam(struct tty *, struct termios *); 131 132 void scicnprobe(struct consdev *); 133 void scicninit(struct consdev *); 134 void scicnputc(dev_t, int); 135 int scicngetc(dev_t); 136 void scicnpoolc(dev_t, int); 137 int sciintr(void *); 138 139 struct sci_softc { 140 struct device sc_dev; /* boilerplate */ 141 struct tty *sc_tty; 142 void *sc_si; 143 callout_t sc_diag_ch; 144 145 #if 0 146 bus_space_tag_t sc_iot; /* ISA i/o space identifier */ 147 bus_space_handle_t sc_ioh; /* ISA io handle */ 148 149 int sc_drq; 150 151 int sc_frequency; 152 #endif 153 154 u_int sc_overflows, 155 sc_floods, 156 sc_errors; /* number of retries so far */ 157 u_char sc_status[7]; /* copy of registers */ 158 159 int sc_hwflags; 160 int sc_swflags; 161 u_int sc_fifolen; /* XXX always 0? */ 162 163 u_int sc_r_hiwat, 164 sc_r_lowat; 165 u_char *volatile sc_rbget, 166 *volatile sc_rbput; 167 volatile u_int sc_rbavail; 168 u_char *sc_rbuf, 169 *sc_ebuf; 170 171 u_char *sc_tba; /* transmit buffer address */ 172 u_int sc_tbc, /* transmit byte count */ 173 sc_heldtbc; 174 175 volatile u_char sc_rx_flags, /* receiver blocked */ 176 #define RX_TTY_BLOCKED 0x01 177 #define RX_TTY_OVERFLOWED 0x02 178 #define RX_IBUF_BLOCKED 0x04 179 #define RX_IBUF_OVERFLOWED 0x08 180 #define RX_ANY_BLOCK 0x0f 181 sc_tx_busy, /* working on an output chunk */ 182 sc_tx_done, /* done with one output chunk */ 183 sc_tx_stopped, /* H/W level stop (lost CTS) */ 184 sc_st_check, /* got a status interrupt */ 185 sc_rx_ready; 186 187 volatile u_char sc_heldchange; 188 }; 189 190 /* controller driver configuration */ 191 static int sci_match(struct device *, struct cfdata *, void *); 192 static void sci_attach(struct device *, struct device *, void *); 193 194 void sci_break(struct sci_softc *, int); 195 void sci_iflush(struct sci_softc *); 196 197 #define integrate static inline 198 void scisoft(void *); 199 200 integrate void sci_rxsoft(struct sci_softc *, struct tty *); 201 integrate void sci_txsoft(struct sci_softc *, struct tty *); 202 integrate void sci_stsoft(struct sci_softc *, struct tty *); 203 integrate void sci_schedrx(struct sci_softc *); 204 void scidiag(void *); 205 206 #define SCIUNIT_MASK 0x7ffff 207 #define SCIDIALOUT_MASK 0x80000 208 209 #define SCIUNIT(x) (minor(x) & SCIUNIT_MASK) 210 #define SCIDIALOUT(x) (minor(x) & SCIDIALOUT_MASK) 211 212 /* Hardware flag masks */ 213 #define SCI_HW_NOIEN 0x01 214 #define SCI_HW_FIFO 0x02 215 #define SCI_HW_FLOW 0x08 216 #define SCI_HW_DEV_OK 0x20 217 #define SCI_HW_CONSOLE 0x40 218 #define SCI_HW_KGDB 0x80 219 220 /* Buffer size for character buffer */ 221 #define SCI_RING_SIZE 2048 222 223 /* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 224 u_int sci_rbuf_hiwat = (SCI_RING_SIZE * 1) / 4; 225 u_int sci_rbuf_lowat = (SCI_RING_SIZE * 3) / 4; 226 227 #define CONMODE ((TTYDEF_CFLAG & ~(CSIZE | CSTOPB | PARENB)) | CS8) /* 8N1 */ 228 int sciconscflag = CONMODE; 229 int sciisconsole = 0; 230 231 #ifdef SCICN_SPEED 232 int scicn_speed = SCICN_SPEED; 233 #else 234 int scicn_speed = 9600; 235 #endif 236 237 #define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */ 238 239 u_int sci_rbuf_size = SCI_RING_SIZE; 240 241 CFATTACH_DECL(sci, sizeof(struct sci_softc), 242 sci_match, sci_attach, NULL, NULL); 243 244 extern struct cfdriver sci_cd; 245 246 static int sci_attached; 247 248 dev_type_open(sciopen); 249 dev_type_close(sciclose); 250 dev_type_read(sciread); 251 dev_type_write(sciwrite); 252 dev_type_ioctl(sciioctl); 253 dev_type_stop(scistop); 254 dev_type_tty(scitty); 255 dev_type_poll(scipoll); 256 257 const struct cdevsw sci_cdevsw = { 258 sciopen, sciclose, sciread, sciwrite, sciioctl, 259 scistop, scitty, scipoll, nommap, ttykqfilter, D_TTY 260 }; 261 262 void InitializeSci (unsigned int); 263 264 /* 265 * following functions are debugging prupose only 266 */ 267 #define CR 0x0D 268 #define I2C_ADRS (*(volatile unsigned int *)0xa8000000) 269 #define USART_ON (unsigned int)~0x08 270 271 void sci_putc(unsigned char); 272 unsigned char sci_getc(void); 273 int SciErrCheck(void); 274 275 /* 276 * InitializeSci 277 * : unsigned int bps; 278 * : SCI(Serial Communication Interface) 279 */ 280 281 void 282 InitializeSci(unsigned int bps) 283 { 284 285 /* Initialize SCR */ 286 SHREG_SCSCR = 0x00; 287 288 /* Serial Mode Register */ 289 SHREG_SCSMR = 0x00; /* Async,8bit,NonParity,Even,1Stop,NoMulti */ 290 291 /* Bit Rate Register */ 292 SHREG_SCBRR = divrnd(sh_clock_get_pclock(), 32 * bps) - 1; 293 294 /* 295 * wait 1mSec, because Send/Recv must begin 1 bit period after 296 * BRR is set. 297 */ 298 delay(1000); 299 300 /* Send permission, Receive permission ON */ 301 SHREG_SCSCR = SCSCR_TE | SCSCR_RE; 302 303 /* Serial Status Register */ 304 SHREG_SCSSR &= SCSSR_TDRE; /* Clear Status */ 305 306 #if 0 307 I2C_ADRS &= ~0x08; /* enable RS-232C */ 308 #endif 309 } 310 311 312 /* 313 * sci_putc 314 * : unsigned char c; 315 */ 316 void 317 sci_putc(unsigned char c) 318 { 319 320 /* wait for ready */ 321 while ((SHREG_SCSSR & SCSSR_TDRE) == 0) 322 ; 323 324 /* write send data to send register */ 325 SHREG_SCTDR = c; 326 327 /* clear ready flag */ 328 SHREG_SCSSR &= ~SCSSR_TDRE; 329 } 330 331 /* 332 * : SciErrCheck 333 * 0x20 = over run 334 * 0x10 = frame error 335 * 0x80 = parity error 336 */ 337 int 338 SciErrCheck(void) 339 { 340 341 return(SHREG_SCSSR & (SCSSR_ORER | SCSSR_FER | SCSSR_PER)); 342 } 343 344 /* 345 * sci_getc 346 */ 347 unsigned char 348 sci_getc(void) 349 { 350 unsigned char c, err_c; 351 352 while (((err_c = SHREG_SCSSR) 353 & (SCSSR_RDRF | SCSSR_ORER | SCSSR_FER | SCSSR_PER)) == 0) 354 ; 355 if ((err_c & (SCSSR_ORER | SCSSR_FER | SCSSR_PER)) != 0) { 356 SHREG_SCSSR &= ~(SCSSR_ORER | SCSSR_FER | SCSSR_PER); 357 return(err_c |= 0x80); 358 } 359 360 c = SHREG_SCRDR; 361 362 SHREG_SCSSR &= ~SCSSR_RDRF; 363 364 return(c); 365 } 366 367 static int 368 sci_match(struct device *parent, struct cfdata *cfp, void *aux) 369 { 370 371 if (strcmp(cfp->cf_name, "sci") || sci_attached) 372 return 0; 373 374 return 1; 375 } 376 377 static void 378 sci_attach(struct device *parent, struct device *self, void *aux) 379 { 380 struct sci_softc *sc = (struct sci_softc *)self; 381 struct tty *tp; 382 383 sci_attached = 1; 384 385 sc->sc_hwflags = 0; /* XXX */ 386 sc->sc_swflags = 0; /* XXX */ 387 sc->sc_fifolen = 0; /* XXX */ 388 389 if (sciisconsole) { 390 SET(sc->sc_hwflags, SCI_HW_CONSOLE); 391 SET(sc->sc_swflags, TIOCFLAG_SOFTCAR); 392 printf("\n%s: console\n", sc->sc_dev.dv_xname); 393 } else { 394 InitializeSci(9600); 395 printf("\n"); 396 } 397 398 callout_init(&sc->sc_diag_ch, 0); 399 400 intc_intr_establish(SH_INTEVT_SCI_ERI, IST_LEVEL, IPL_SERIAL, sciintr, 401 sc); 402 intc_intr_establish(SH_INTEVT_SCI_RXI, IST_LEVEL, IPL_SERIAL, sciintr, 403 sc); 404 intc_intr_establish(SH_INTEVT_SCI_TXI, IST_LEVEL, IPL_SERIAL, sciintr, 405 sc); 406 intc_intr_establish(SH_INTEVT_SCI_TEI, IST_LEVEL, IPL_SERIAL, sciintr, 407 sc); 408 409 sc->sc_si = softint_establish(SOFTINT_SERIAL, scisoft, sc); 410 SET(sc->sc_hwflags, SCI_HW_DEV_OK); 411 412 tp = ttymalloc(); 413 tp->t_oproc = scistart; 414 tp->t_param = sciparam; 415 tp->t_hwiflow = NULL; 416 417 sc->sc_tty = tp; 418 sc->sc_rbuf = malloc(sci_rbuf_size << 1, M_DEVBUF, M_NOWAIT); 419 if (sc->sc_rbuf == NULL) { 420 printf("%s: unable to allocate ring buffer\n", 421 sc->sc_dev.dv_xname); 422 return; 423 } 424 sc->sc_ebuf = sc->sc_rbuf + (sci_rbuf_size << 1); 425 426 tty_attach(tp); 427 } 428 429 /* 430 * Start or restart transmission. 431 */ 432 static void 433 scistart(struct tty *tp) 434 { 435 struct sci_softc *sc = sci_cd.cd_devs[SCIUNIT(tp->t_dev)]; 436 int s; 437 438 s = spltty(); 439 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 440 goto out; 441 if (sc->sc_tx_stopped) 442 goto out; 443 if (!ttypull(tp)) 444 goto out; 445 446 /* Grab the first contiguous region of buffer space. */ 447 { 448 u_char *tba; 449 int tbc; 450 451 tba = tp->t_outq.c_cf; 452 tbc = ndqb(&tp->t_outq, 0); 453 454 (void)splserial(); 455 456 sc->sc_tba = tba; 457 sc->sc_tbc = tbc; 458 } 459 460 SET(tp->t_state, TS_BUSY); 461 sc->sc_tx_busy = 1; 462 463 /* Enable transmit completion interrupts if necessary. */ 464 SHREG_SCSCR |= SCSCR_TIE | SCSCR_RIE; 465 466 /* Output the first byte of the contiguous buffer. */ 467 { 468 if (sc->sc_tbc > 0) { 469 sci_putc(*(sc->sc_tba)); 470 sc->sc_tba++; 471 sc->sc_tbc--; 472 } 473 } 474 out: 475 splx(s); 476 return; 477 } 478 479 /* 480 * Set SCI tty parameters from termios. 481 * XXX - Should just copy the whole termios after 482 * making sure all the changes could be done. 483 */ 484 static int 485 sciparam(struct tty *tp, struct termios *t) 486 { 487 struct sci_softc *sc = sci_cd.cd_devs[SCIUNIT(tp->t_dev)]; 488 int ospeed = t->c_ospeed; 489 int s; 490 491 if (!device_is_active(&sc->sc_dev)) 492 return (EIO); 493 494 /* Check requested parameters. */ 495 if (ospeed < 0) 496 return (EINVAL); 497 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 498 return (EINVAL); 499 500 /* 501 * For the console, always force CLOCAL and !HUPCL, so that the port 502 * is always active. 503 */ 504 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) || 505 ISSET(sc->sc_hwflags, SCI_HW_CONSOLE)) { 506 SET(t->c_cflag, CLOCAL); 507 CLR(t->c_cflag, HUPCL); 508 } 509 510 /* 511 * If there were no changes, don't do anything. This avoids dropping 512 * input and improves performance when all we did was frob things like 513 * VMIN and VTIME. 514 */ 515 if (tp->t_ospeed == t->c_ospeed && 516 tp->t_cflag == t->c_cflag) 517 return (0); 518 519 #if 0 520 /* XXX (msaitoh) */ 521 lcr = ISSET(sc->sc_lcr, LCR_SBREAK) | cflag2lcr(t->c_cflag); 522 #endif 523 524 s = splserial(); 525 526 /* 527 * Set the FIFO threshold based on the receive speed. 528 * 529 * * If it's a low speed, it's probably a mouse or some other 530 * interactive device, so set the threshold low. 531 * * If it's a high speed, trim the trigger level down to prevent 532 * overflows. 533 * * Otherwise set it a bit higher. 534 */ 535 #if 0 536 /* XXX (msaitoh) */ 537 if (ISSET(sc->sc_hwflags, SCI_HW_HAYESP)) 538 sc->sc_fifo = FIFO_DMA_MODE | FIFO_ENABLE | FIFO_TRIGGER_8; 539 else if (ISSET(sc->sc_hwflags, SCI_HW_FIFO)) 540 sc->sc_fifo = FIFO_ENABLE | 541 (t->c_ospeed <= 1200 ? FIFO_TRIGGER_1 : 542 t->c_ospeed <= 38400 ? FIFO_TRIGGER_8 : FIFO_TRIGGER_4); 543 else 544 sc->sc_fifo = 0; 545 #endif 546 547 /* And copy to tty. */ 548 tp->t_ispeed = 0; 549 tp->t_ospeed = t->c_ospeed; 550 tp->t_cflag = t->c_cflag; 551 552 if (!sc->sc_heldchange) { 553 if (sc->sc_tx_busy) { 554 sc->sc_heldtbc = sc->sc_tbc; 555 sc->sc_tbc = 0; 556 sc->sc_heldchange = 1; 557 } 558 #if 0 559 /* XXX (msaitoh) */ 560 else 561 sci_loadchannelregs(sc); 562 #endif 563 } 564 565 if (!ISSET(t->c_cflag, CHWFLOW)) { 566 /* Disable the high water mark. */ 567 sc->sc_r_hiwat = 0; 568 sc->sc_r_lowat = 0; 569 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 570 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 571 sci_schedrx(sc); 572 } 573 } else { 574 sc->sc_r_hiwat = sci_rbuf_hiwat; 575 sc->sc_r_lowat = sci_rbuf_lowat; 576 } 577 578 splx(s); 579 580 #ifdef SCI_DEBUG 581 if (sci_debug) 582 scistatus(sc, "sciparam "); 583 #endif 584 585 if (!ISSET(t->c_cflag, CHWFLOW)) { 586 if (sc->sc_tx_stopped) { 587 sc->sc_tx_stopped = 0; 588 scistart(tp); 589 } 590 } 591 592 return (0); 593 } 594 595 void 596 sci_iflush(struct sci_softc *sc) 597 { 598 unsigned char err_c; 599 volatile unsigned char c; 600 601 if (((err_c = SHREG_SCSSR) 602 & (SCSSR_RDRF | SCSSR_ORER | SCSSR_FER | SCSSR_PER)) != 0) { 603 604 if ((err_c & (SCSSR_ORER | SCSSR_FER | SCSSR_PER)) != 0) { 605 SHREG_SCSSR &= ~(SCSSR_ORER | SCSSR_FER | SCSSR_PER); 606 return; 607 } 608 609 c = SHREG_SCRDR; 610 611 SHREG_SCSSR &= ~SCSSR_RDRF; 612 } 613 } 614 615 int 616 sciopen(dev_t dev, int flag, int mode, struct lwp *l) 617 { 618 int unit = SCIUNIT(dev); 619 struct sci_softc *sc; 620 struct tty *tp; 621 int s, s2; 622 int error; 623 624 if (unit >= sci_cd.cd_ndevs) 625 return (ENXIO); 626 sc = sci_cd.cd_devs[unit]; 627 if (sc == 0 || !ISSET(sc->sc_hwflags, SCI_HW_DEV_OK) || 628 sc->sc_rbuf == NULL) 629 return (ENXIO); 630 631 if (!device_is_active(&sc->sc_dev)) 632 return (ENXIO); 633 634 #ifdef KGDB 635 /* 636 * If this is the kgdb port, no other use is permitted. 637 */ 638 if (ISSET(sc->sc_hwflags, SCI_HW_KGDB)) 639 return (EBUSY); 640 #endif 641 642 tp = sc->sc_tty; 643 644 if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp)) 645 return (EBUSY); 646 647 s = spltty(); 648 649 /* 650 * Do the following iff this is a first open. 651 */ 652 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 653 struct termios t; 654 655 tp->t_dev = dev; 656 657 s2 = splserial(); 658 659 /* Turn on interrupts. */ 660 SHREG_SCSCR |= SCSCR_TIE | SCSCR_RIE; 661 662 splx(s2); 663 664 /* 665 * Initialize the termios status to the defaults. Add in the 666 * sticky bits from TIOCSFLAGS. 667 */ 668 t.c_ispeed = 0; 669 if (ISSET(sc->sc_hwflags, SCI_HW_CONSOLE)) { 670 t.c_ospeed = scicn_speed; 671 t.c_cflag = sciconscflag; 672 } else { 673 t.c_ospeed = TTYDEF_SPEED; 674 t.c_cflag = TTYDEF_CFLAG; 675 } 676 if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL)) 677 SET(t.c_cflag, CLOCAL); 678 if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)) 679 SET(t.c_cflag, CRTSCTS); 680 if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF)) 681 SET(t.c_cflag, MDMBUF); 682 /* Make sure sciparam() will do something. */ 683 tp->t_ospeed = 0; 684 (void) sciparam(tp, &t); 685 tp->t_iflag = TTYDEF_IFLAG; 686 tp->t_oflag = TTYDEF_OFLAG; 687 tp->t_lflag = TTYDEF_LFLAG; 688 ttychars(tp); 689 ttsetwater(tp); 690 691 s2 = splserial(); 692 693 /* Clear the input ring, and unblock. */ 694 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 695 sc->sc_rbavail = sci_rbuf_size; 696 sci_iflush(sc); 697 CLR(sc->sc_rx_flags, RX_ANY_BLOCK); 698 #if 0 699 /* XXX (msaitoh) */ 700 sci_hwiflow(sc); 701 #endif 702 703 #ifdef SCI_DEBUG 704 if (sci_debug) 705 scistatus(sc, "sciopen "); 706 #endif 707 708 splx(s2); 709 } 710 711 splx(s); 712 713 error = ttyopen(tp, SCIDIALOUT(dev), ISSET(flag, O_NONBLOCK)); 714 if (error) 715 goto bad; 716 717 error = (*tp->t_linesw->l_open)(dev, tp); 718 if (error) 719 goto bad; 720 721 return (0); 722 723 bad: 724 725 return (error); 726 } 727 728 int 729 sciclose(dev_t dev, int flag, int mode, struct lwp *l) 730 { 731 struct sci_softc *sc = sci_cd.cd_devs[SCIUNIT(dev)]; 732 struct tty *tp = sc->sc_tty; 733 734 /* XXX This is for cons.c. */ 735 if (!ISSET(tp->t_state, TS_ISOPEN)) 736 return (0); 737 738 (*tp->t_linesw->l_close)(tp, flag); 739 ttyclose(tp); 740 741 if (!device_is_active(&sc->sc_dev)) 742 return (0); 743 744 return (0); 745 } 746 747 int 748 sciread(dev_t dev, struct uio *uio, int flag) 749 { 750 struct sci_softc *sc = sci_cd.cd_devs[SCIUNIT(dev)]; 751 struct tty *tp = sc->sc_tty; 752 753 return ((*tp->t_linesw->l_read)(tp, uio, flag)); 754 } 755 756 int 757 sciwrite(dev_t dev, struct uio *uio, int flag) 758 { 759 struct sci_softc *sc = sci_cd.cd_devs[SCIUNIT(dev)]; 760 struct tty *tp = sc->sc_tty; 761 762 return ((*tp->t_linesw->l_write)(tp, uio, flag)); 763 } 764 765 int 766 scipoll(dev_t dev, int events, struct lwp *l) 767 { 768 struct sci_softc *sc = sci_cd.cd_devs[SCIUNIT(dev)]; 769 struct tty *tp = sc->sc_tty; 770 771 return ((*tp->t_linesw->l_poll)(tp, events, l)); 772 } 773 774 struct tty * 775 scitty(dev_t dev) 776 { 777 struct sci_softc *sc = sci_cd.cd_devs[SCIUNIT(dev)]; 778 struct tty *tp = sc->sc_tty; 779 780 return (tp); 781 } 782 783 int 784 sciioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 785 { 786 struct sci_softc *sc = sci_cd.cd_devs[SCIUNIT(dev)]; 787 struct tty *tp = sc->sc_tty; 788 int error; 789 int s; 790 791 if (!device_is_active(&sc->sc_dev)) 792 return (EIO); 793 794 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 795 if (error != EPASSTHROUGH) 796 return (error); 797 798 error = ttioctl(tp, cmd, data, flag, l); 799 if (error != EPASSTHROUGH) 800 return (error); 801 802 error = 0; 803 804 s = splserial(); 805 806 switch (cmd) { 807 case TIOCSBRK: 808 sci_break(sc, 1); 809 break; 810 811 case TIOCCBRK: 812 sci_break(sc, 0); 813 break; 814 815 case TIOCGFLAGS: 816 *(int *)data = sc->sc_swflags; 817 break; 818 819 case TIOCSFLAGS: 820 error = kauth_authorize_device_tty(l->l_cred, 821 KAUTH_DEVICE_TTY_PRIVSET, tp); 822 if (error) 823 break; 824 sc->sc_swflags = *(int *)data; 825 break; 826 827 default: 828 error = EPASSTHROUGH; 829 break; 830 } 831 832 splx(s); 833 834 return (error); 835 } 836 837 integrate void 838 sci_schedrx(struct sci_softc *sc) 839 { 840 841 sc->sc_rx_ready = 1; 842 843 /* Wake up the poller. */ 844 softint_schedule(sc->sc_si); 845 } 846 847 void 848 sci_break(struct sci_softc *sc, int onoff) 849 { 850 851 if (onoff) 852 SHREG_SCSSR &= ~SCSSR_TDRE; 853 else 854 SHREG_SCSSR |= SCSSR_TDRE; 855 856 #if 0 /* XXX */ 857 if (!sc->sc_heldchange) { 858 if (sc->sc_tx_busy) { 859 sc->sc_heldtbc = sc->sc_tbc; 860 sc->sc_tbc = 0; 861 sc->sc_heldchange = 1; 862 } else 863 sci_loadchannelregs(sc); 864 } 865 #endif 866 } 867 868 /* 869 * Stop output, e.g., for ^S or output flush. 870 */ 871 void 872 scistop(struct tty *tp, int flag) 873 { 874 struct sci_softc *sc = sci_cd.cd_devs[SCIUNIT(tp->t_dev)]; 875 int s; 876 877 s = splserial(); 878 if (ISSET(tp->t_state, TS_BUSY)) { 879 /* Stop transmitting at the next chunk. */ 880 sc->sc_tbc = 0; 881 sc->sc_heldtbc = 0; 882 if (!ISSET(tp->t_state, TS_TTSTOP)) 883 SET(tp->t_state, TS_FLUSH); 884 } 885 splx(s); 886 } 887 888 void 889 scidiag(void *arg) 890 { 891 struct sci_softc *sc = arg; 892 int overflows, floods; 893 int s; 894 895 s = splserial(); 896 overflows = sc->sc_overflows; 897 sc->sc_overflows = 0; 898 floods = sc->sc_floods; 899 sc->sc_floods = 0; 900 sc->sc_errors = 0; 901 splx(s); 902 903 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 904 sc->sc_dev.dv_xname, 905 overflows, overflows == 1 ? "" : "s", 906 floods, floods == 1 ? "" : "s"); 907 } 908 909 integrate void 910 sci_rxsoft(struct sci_softc *sc, struct tty *tp) 911 { 912 int (*rint)(int, struct tty *) = tp->t_linesw->l_rint; 913 u_char *get, *end; 914 u_int cc, scc; 915 u_char ssr; 916 int code; 917 int s; 918 919 end = sc->sc_ebuf; 920 get = sc->sc_rbget; 921 scc = cc = sci_rbuf_size - sc->sc_rbavail; 922 923 if (cc == sci_rbuf_size) { 924 sc->sc_floods++; 925 if (sc->sc_errors++ == 0) 926 callout_reset(&sc->sc_diag_ch, 60 * hz, scidiag, sc); 927 } 928 929 while (cc) { 930 code = get[0]; 931 ssr = get[1]; 932 if (ISSET(ssr, SCSSR_FER | SCSSR_PER)) { 933 if (ISSET(ssr, SCSSR_FER)) 934 SET(code, TTY_FE); 935 if (ISSET(ssr, SCSSR_PER)) 936 SET(code, TTY_PE); 937 } 938 if ((*rint)(code, tp) == -1) { 939 /* 940 * The line discipline's buffer is out of space. 941 */ 942 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 943 /* 944 * We're either not using flow control, or the 945 * line discipline didn't tell us to block for 946 * some reason. Either way, we have no way to 947 * know when there's more space available, so 948 * just drop the rest of the data. 949 */ 950 get += cc << 1; 951 if (get >= end) 952 get -= sci_rbuf_size << 1; 953 cc = 0; 954 } else { 955 /* 956 * Don't schedule any more receive processing 957 * until the line discipline tells us there's 958 * space available (through scihwiflow()). 959 * Leave the rest of the data in the input 960 * buffer. 961 */ 962 SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 963 } 964 break; 965 } 966 get += 2; 967 if (get >= end) 968 get = sc->sc_rbuf; 969 cc--; 970 } 971 972 if (cc != scc) { 973 sc->sc_rbget = get; 974 s = splserial(); 975 cc = sc->sc_rbavail += scc - cc; 976 /* Buffers should be ok again, release possible block. */ 977 if (cc >= sc->sc_r_lowat) { 978 if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 979 CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 980 SHREG_SCSCR |= SCSCR_RIE; 981 } 982 #if 0 983 if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) { 984 CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED); 985 sci_hwiflow(sc); 986 } 987 #endif 988 } 989 splx(s); 990 } 991 } 992 993 integrate void 994 sci_txsoft(sc, tp) 995 struct sci_softc *sc; 996 struct tty *tp; 997 { 998 999 CLR(tp->t_state, TS_BUSY); 1000 if (ISSET(tp->t_state, TS_FLUSH)) 1001 CLR(tp->t_state, TS_FLUSH); 1002 else 1003 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf)); 1004 (*tp->t_linesw->l_start)(tp); 1005 } 1006 1007 integrate void 1008 sci_stsoft(struct sci_softc *sc, struct tty *tp) 1009 { 1010 #if 0 1011 /* XXX (msaitoh) */ 1012 u_char msr, delta; 1013 int s; 1014 1015 s = splserial(); 1016 msr = sc->sc_msr; 1017 delta = sc->sc_msr_delta; 1018 sc->sc_msr_delta = 0; 1019 splx(s); 1020 1021 if (ISSET(delta, sc->sc_msr_dcd)) { 1022 /* 1023 * Inform the tty layer that carrier detect changed. 1024 */ 1025 (void) (*tp->t_linesw->l_modem)(tp, ISSET(msr, MSR_DCD)); 1026 } 1027 1028 if (ISSET(delta, sc->sc_msr_cts)) { 1029 /* Block or unblock output according to flow control. */ 1030 if (ISSET(msr, sc->sc_msr_cts)) { 1031 sc->sc_tx_stopped = 0; 1032 (*tp->t_linesw->l_start)(tp); 1033 } else { 1034 sc->sc_tx_stopped = 1; 1035 } 1036 } 1037 1038 #ifdef SCI_DEBUG 1039 if (sci_debug) 1040 scistatus(sc, "sci_stsoft"); 1041 #endif 1042 #endif 1043 } 1044 1045 void 1046 scisoft(void *arg) 1047 { 1048 struct sci_softc *sc = arg; 1049 struct tty *tp; 1050 1051 if (!device_is_active(&sc->sc_dev)) 1052 return; 1053 1054 tp = sc->sc_tty; 1055 1056 if (sc->sc_rx_ready) { 1057 sc->sc_rx_ready = 0; 1058 sci_rxsoft(sc, tp); 1059 } 1060 1061 #if 0 1062 if (sc->sc_st_check) { 1063 sc->sc_st_check = 0; 1064 sci_stsoft(sc, tp); 1065 } 1066 #endif 1067 1068 if (sc->sc_tx_done) { 1069 sc->sc_tx_done = 0; 1070 sci_txsoft(sc, tp); 1071 } 1072 } 1073 1074 int 1075 sciintr(void *arg) 1076 { 1077 struct sci_softc *sc = arg; 1078 u_char *put, *end; 1079 u_int cc; 1080 u_short ssr; 1081 1082 if (!device_is_active(&sc->sc_dev)) 1083 return (0); 1084 1085 end = sc->sc_ebuf; 1086 put = sc->sc_rbput; 1087 cc = sc->sc_rbavail; 1088 1089 do { 1090 ssr = SHREG_SCSSR; 1091 if (ISSET(ssr, SCSSR_FER)) { 1092 SHREG_SCSSR &= ~(SCSSR_ORER | SCSSR_PER | SCSSR_FER); 1093 #if defined(DDB) || defined(KGDB) 1094 #ifdef SH4 1095 if ((SHREG_SCSPTR & SCSPTR_SPB0DT) != 0) { 1096 #else 1097 if ((SHREG_SCSPDR & SCSPDR_SCP0DT) != 0) { 1098 #endif 1099 #ifdef DDB 1100 if (ISSET(sc->sc_hwflags, SCI_HW_CONSOLE)) { 1101 console_debugger(); 1102 } 1103 #endif 1104 #ifdef KGDB 1105 if (ISSET(sc->sc_hwflags, SCI_HW_KGDB)) { 1106 kgdb_connect(1); 1107 } 1108 #endif 1109 } 1110 #endif /* DDB || KGDB */ 1111 } 1112 if ((SHREG_SCSSR & SCSSR_RDRF) != 0) { 1113 if (cc > 0) { 1114 put[0] = SHREG_SCRDR; 1115 put[1] = SHREG_SCSSR & 0x00ff; 1116 1117 put += 2; 1118 if (put >= end) 1119 put = sc->sc_rbuf; 1120 cc--; 1121 } 1122 1123 SHREG_SCSSR &= ~(SCSSR_ORER | SCSSR_FER | SCSSR_PER | 1124 SCSSR_RDRF); 1125 1126 /* 1127 * Current string of incoming characters ended because 1128 * no more data was available or we ran out of space. 1129 * Schedule a receive event if any data was received. 1130 * If we're out of space, turn off receive interrupts. 1131 */ 1132 sc->sc_rbput = put; 1133 sc->sc_rbavail = cc; 1134 if (!ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) 1135 sc->sc_rx_ready = 1; 1136 1137 /* 1138 * See if we are in danger of overflowing a buffer. If 1139 * so, use hardware flow control to ease the pressure. 1140 */ 1141 if (!ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED) && 1142 cc < sc->sc_r_hiwat) { 1143 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1144 #if 0 1145 sci_hwiflow(sc); 1146 #endif 1147 } 1148 1149 /* 1150 * If we're out of space, disable receive interrupts 1151 * until the queue has drained a bit. 1152 */ 1153 if (!cc) { 1154 SET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1155 SHREG_SCSCR &= ~SCSCR_RIE; 1156 } 1157 } else { 1158 if (SHREG_SCSSR & SCSSR_RDRF) { 1159 SHREG_SCSCR &= ~(SCSCR_TIE | SCSCR_RIE); 1160 delay(10); 1161 SHREG_SCSCR |= SCSCR_TIE | SCSCR_RIE; 1162 continue; 1163 } 1164 } 1165 } while (SHREG_SCSSR & SCSSR_RDRF); 1166 1167 #if 0 1168 msr = bus_space_read_1(iot, ioh, sci_msr); 1169 delta = msr ^ sc->sc_msr; 1170 sc->sc_msr = msr; 1171 if (ISSET(delta, sc->sc_msr_mask)) { 1172 SET(sc->sc_msr_delta, delta); 1173 1174 /* 1175 * Pulse-per-second clock signal on edge of DCD? 1176 */ 1177 if (ISSET(delta, sc->sc_ppsmask)) { 1178 struct timeval tv; 1179 if (ISSET(msr, sc->sc_ppsmask) == 1180 sc->sc_ppsassert) { 1181 /* XXX nanotime() */ 1182 microtime(&tv); 1183 TIMEVAL_TO_TIMESPEC(&tv, 1184 &sc->ppsinfo.assert_timestamp); 1185 if (sc->ppsparam.mode & PPS_OFFSETASSERT) { 1186 timespecadd(&sc->ppsinfo.assert_timestamp, 1187 &sc->ppsparam.assert_offset, 1188 &sc->ppsinfo.assert_timestamp); 1189 TIMESPEC_TO_TIMEVAL(&tv, &sc->ppsinfo.assert_timestamp); 1190 } 1191 1192 #ifdef PPS_SYNC 1193 if (sc->ppsparam.mode & PPS_HARDPPSONASSERT) 1194 hardpps(&tv, tv.tv_usec); 1195 #endif 1196 sc->ppsinfo.assert_sequence++; 1197 sc->ppsinfo.current_mode = 1198 sc->ppsparam.mode; 1199 1200 } else if (ISSET(msr, sc->sc_ppsmask) == 1201 sc->sc_ppsclear) { 1202 /* XXX nanotime() */ 1203 microtime(&tv); 1204 TIMEVAL_TO_TIMESPEC(&tv, 1205 &sc->ppsinfo.clear_timestamp); 1206 if (sc->ppsparam.mode & PPS_OFFSETCLEAR) { 1207 timespecadd(&sc->ppsinfo.clear_timestamp, 1208 &sc->ppsparam.clear_offset, 1209 &sc->ppsinfo.clear_timestamp); 1210 TIMESPEC_TO_TIMEVAL(&tv, &sc->ppsinfo.clear_timestamp); 1211 } 1212 1213 #ifdef PPS_SYNC 1214 if (sc->ppsparam.mode & PPS_HARDPPSONCLEAR) 1215 hardpps(&tv, tv.tv_usec); 1216 #endif 1217 sc->ppsinfo.clear_sequence++; 1218 sc->ppsinfo.current_mode = 1219 sc->ppsparam.mode; 1220 } 1221 } 1222 1223 /* 1224 * Stop output immediately if we lose the output 1225 * flow control signal or carrier detect. 1226 */ 1227 if (ISSET(~msr, sc->sc_msr_mask)) { 1228 sc->sc_tbc = 0; 1229 sc->sc_heldtbc = 0; 1230 #ifdef SCI_DEBUG 1231 if (sci_debug) 1232 scistatus(sc, "sciintr "); 1233 #endif 1234 } 1235 1236 sc->sc_st_check = 1; 1237 } 1238 #endif 1239 1240 /* 1241 * Done handling any receive interrupts. See if data can be 1242 * transmitted as well. Schedule tx done event if no data left 1243 * and tty was marked busy. 1244 */ 1245 if ((SHREG_SCSSR & SCSSR_TDRE) != 0) { 1246 /* 1247 * If we've delayed a parameter change, do it now, and restart 1248 * output. 1249 */ 1250 if (sc->sc_heldchange) { 1251 sc->sc_heldchange = 0; 1252 sc->sc_tbc = sc->sc_heldtbc; 1253 sc->sc_heldtbc = 0; 1254 } 1255 1256 /* Output the next chunk of the contiguous buffer, if any. */ 1257 if (sc->sc_tbc > 0) { 1258 sci_putc(*(sc->sc_tba)); 1259 sc->sc_tba++; 1260 sc->sc_tbc--; 1261 } else { 1262 /* Disable transmit completion interrupts if necessary. */ 1263 #if 0 1264 if (ISSET(sc->sc_ier, IER_ETXRDY)) 1265 #endif 1266 SHREG_SCSCR &= ~SCSCR_TIE; 1267 1268 if (sc->sc_tx_busy) { 1269 sc->sc_tx_busy = 0; 1270 sc->sc_tx_done = 1; 1271 } 1272 } 1273 } 1274 1275 /* Wake up the poller. */ 1276 softint_schedule(sc->sc_si); 1277 1278 #if NRND > 0 && defined(RND_SCI) 1279 rnd_add_uint32(&sc->rnd_source, iir | lsr); 1280 #endif 1281 1282 return (1); 1283 } 1284 1285 void 1286 scicnprobe(cp) 1287 struct consdev *cp; 1288 { 1289 int maj; 1290 1291 /* locate the major number */ 1292 maj = cdevsw_lookup_major(&sci_cdevsw); 1293 1294 /* Initialize required fields. */ 1295 cp->cn_dev = makedev(maj, 0); 1296 #ifdef SCICONSOLE 1297 cp->cn_pri = CN_REMOTE; 1298 #else 1299 cp->cn_pri = CN_NORMAL; 1300 #endif 1301 } 1302 1303 void 1304 scicninit(struct consdev *cp) 1305 { 1306 1307 InitializeSci(scicn_speed); 1308 sciisconsole = 1; 1309 } 1310 1311 int 1312 scicngetc(dev_t dev) 1313 { 1314 int c; 1315 int s; 1316 1317 s = splserial(); 1318 c = sci_getc(); 1319 splx(s); 1320 1321 return (c); 1322 } 1323 1324 void 1325 scicnputc(dev_t dev, int c) 1326 { 1327 int s; 1328 1329 s = splserial(); 1330 sci_putc((u_char)c); 1331 splx(s); 1332 } 1333
Indexes created Wed Oct 01 18:09:54 GMT 2025