sci.c revision 1.57
1 /* $NetBSD: sci.c,v 1.57 2012/12/12 13:32:37 tsutsui Exp $ */ 2 3 /*- 4 * Copyright (C) 1999 T.Horiuchi and SAITOH Masanobu. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 /*- 30 * Copyright (c) 1998, 1999 The NetBSD Foundation, Inc. 31 * All rights reserved. 32 * 33 * This code is derived from software contributed to The NetBSD Foundation 34 * by Charles M. Hannum. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 45 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 46 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 47 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 48 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 49 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 50 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 51 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 52 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 53 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 54 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 55 * POSSIBILITY OF SUCH DAMAGE. 56 */ 57 58 /* 59 * Copyright (c) 1991 The Regents of the University of California. 60 * All rights reserved. 61 * 62 * Redistribution and use in source and binary forms, with or without 63 * modification, are permitted provided that the following conditions 64 * are met: 65 * 1. Redistributions of source code must retain the above copyright 66 * notice, this list of conditions and the following disclaimer. 67 * 2. Redistributions in binary form must reproduce the above copyright 68 * notice, this list of conditions and the following disclaimer in the 69 * documentation and/or other materials provided with the distribution. 70 * 3. Neither the name of the University nor the names of its contributors 71 * may be used to endorse or promote products derived from this software 72 * without specific prior written permission. 73 * 74 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 75 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 76 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 77 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 78 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 79 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 80 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 81 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 82 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 83 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 84 * SUCH DAMAGE. 85 * 86 * @(#)com.c 7.5 (Berkeley) 5/16/91 87 */ 88 89 /* 90 * SH internal serial driver 91 * 92 * This code is derived from both z8530tty.c and com.c 93 */ 94 95 #include <sys/cdefs.h> 96 __KERNEL_RCSID(0, "$NetBSD: sci.c,v 1.57 2012/12/12 13:32:37 tsutsui Exp $"); 97 98 #include "opt_kgdb.h" 99 #include "opt_sci.h" 100 101 #include <sys/param.h> 102 #include <sys/systm.h> 103 #include <sys/tty.h> 104 #include <sys/proc.h> 105 #include <sys/conf.h> 106 #include <sys/file.h> 107 #include <sys/syslog.h> 108 #include <sys/kernel.h> 109 #include <sys/device.h> 110 #include <sys/malloc.h> 111 #include <sys/kauth.h> 112 #include <sys/intr.h> 113 114 #include <dev/cons.h> 115 116 #include <sh3/clock.h> 117 #include <sh3/scireg.h> 118 #include <sh3/pfcreg.h> 119 #include <sh3/tmureg.h> 120 #include <sh3/exception.h> 121 122 static void scistart(struct tty *); 123 static int sciparam(struct tty *, struct termios *); 124 125 void scicnprobe(struct consdev *); 126 void scicninit(struct consdev *); 127 void scicnputc(dev_t, int); 128 int scicngetc(dev_t); 129 void scicnpoolc(dev_t, int); 130 int sciintr(void *); 131 132 struct sci_softc { 133 device_t sc_dev; /* boilerplate */ 134 struct tty *sc_tty; 135 void *sc_si; 136 callout_t sc_diag_ch; 137 138 #if 0 139 bus_space_tag_t sc_iot; /* ISA i/o space identifier */ 140 bus_space_handle_t sc_ioh; /* ISA io handle */ 141 142 int sc_drq; 143 144 int sc_frequency; 145 #endif 146 147 u_int sc_overflows, 148 sc_floods, 149 sc_errors; /* number of retries so far */ 150 u_char sc_status[7]; /* copy of registers */ 151 152 int sc_hwflags; 153 int sc_swflags; 154 u_int sc_fifolen; /* XXX always 0? */ 155 156 u_int sc_r_hiwat, 157 sc_r_lowat; 158 u_char *volatile sc_rbget, 159 *volatile sc_rbput; 160 volatile u_int sc_rbavail; 161 u_char *sc_rbuf, 162 *sc_ebuf; 163 164 u_char *sc_tba; /* transmit buffer address */ 165 u_int sc_tbc, /* transmit byte count */ 166 sc_heldtbc; 167 168 volatile u_char sc_rx_flags, /* receiver blocked */ 169 #define RX_TTY_BLOCKED 0x01 170 #define RX_TTY_OVERFLOWED 0x02 171 #define RX_IBUF_BLOCKED 0x04 172 #define RX_IBUF_OVERFLOWED 0x08 173 #define RX_ANY_BLOCK 0x0f 174 sc_tx_busy, /* working on an output chunk */ 175 sc_tx_done, /* done with one output chunk */ 176 sc_tx_stopped, /* H/W level stop (lost CTS) */ 177 sc_st_check, /* got a status interrupt */ 178 sc_rx_ready; 179 180 volatile u_char sc_heldchange; 181 }; 182 183 /* controller driver configuration */ 184 static int sci_match(device_t, cfdata_t, void *); 185 static void sci_attach(device_t, device_t, void *); 186 187 void sci_break(struct sci_softc *, int); 188 void sci_iflush(struct sci_softc *); 189 190 #define integrate static inline 191 void scisoft(void *); 192 193 integrate void sci_rxsoft(struct sci_softc *, struct tty *); 194 integrate void sci_txsoft(struct sci_softc *, struct tty *); 195 integrate void sci_stsoft(struct sci_softc *, struct tty *); 196 integrate void sci_schedrx(struct sci_softc *); 197 void scidiag(void *); 198 199 #define SCIUNIT_MASK 0x7ffff 200 #define SCIDIALOUT_MASK 0x80000 201 202 #define SCIUNIT(x) (minor(x) & SCIUNIT_MASK) 203 #define SCIDIALOUT(x) (minor(x) & SCIDIALOUT_MASK) 204 205 /* Hardware flag masks */ 206 #define SCI_HW_NOIEN 0x01 207 #define SCI_HW_FIFO 0x02 208 #define SCI_HW_FLOW 0x08 209 #define SCI_HW_DEV_OK 0x20 210 #define SCI_HW_CONSOLE 0x40 211 #define SCI_HW_KGDB 0x80 212 213 /* Buffer size for character buffer */ 214 #define SCI_RING_SIZE 2048 215 216 /* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 217 u_int sci_rbuf_hiwat = (SCI_RING_SIZE * 1) / 4; 218 u_int sci_rbuf_lowat = (SCI_RING_SIZE * 3) / 4; 219 220 #define CONMODE ((TTYDEF_CFLAG & ~(CSIZE | CSTOPB | PARENB)) | CS8) /* 8N1 */ 221 int sciconscflag = CONMODE; 222 int sciisconsole = 0; 223 224 #ifdef SCICN_SPEED 225 int scicn_speed = SCICN_SPEED; 226 #else 227 int scicn_speed = 9600; 228 #endif 229 230 #define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */ 231 232 u_int sci_rbuf_size = SCI_RING_SIZE; 233 234 CFATTACH_DECL_NEW(sci, sizeof(struct sci_softc), 235 sci_match, sci_attach, NULL, NULL); 236 237 extern struct cfdriver sci_cd; 238 239 static int sci_attached; 240 241 dev_type_open(sciopen); 242 dev_type_close(sciclose); 243 dev_type_read(sciread); 244 dev_type_write(sciwrite); 245 dev_type_ioctl(sciioctl); 246 dev_type_stop(scistop); 247 dev_type_tty(scitty); 248 dev_type_poll(scipoll); 249 250 const struct cdevsw sci_cdevsw = { 251 sciopen, sciclose, sciread, sciwrite, sciioctl, 252 scistop, scitty, scipoll, nommap, ttykqfilter, D_TTY 253 }; 254 255 void InitializeSci (unsigned int); 256 257 /* 258 * following functions are debugging prupose only 259 */ 260 #define CR 0x0D 261 #define I2C_ADRS (*(volatile unsigned int *)0xa8000000) 262 #define USART_ON (unsigned int)~0x08 263 264 void sci_putc(unsigned char); 265 unsigned char sci_getc(void); 266 int SciErrCheck(void); 267 268 /* 269 * InitializeSci 270 * : unsigned int bps; 271 * : SCI(Serial Communication Interface) 272 */ 273 274 void 275 InitializeSci(unsigned int bps) 276 { 277 278 /* Initialize SCR */ 279 SHREG_SCSCR = 0x00; 280 281 /* Serial Mode Register */ 282 SHREG_SCSMR = 0x00; /* Async,8bit,NonParity,Even,1Stop,NoMulti */ 283 284 /* Bit Rate Register */ 285 SHREG_SCBRR = divrnd(sh_clock_get_pclock(), 32 * bps) - 1; 286 287 /* 288 * wait 1mSec, because Send/Recv must begin 1 bit period after 289 * BRR is set. 290 */ 291 delay(1000); 292 293 /* Send permission, Receive permission ON */ 294 SHREG_SCSCR = SCSCR_TE | SCSCR_RE; 295 296 /* Serial Status Register */ 297 SHREG_SCSSR &= SCSSR_TDRE; /* Clear Status */ 298 299 #if 0 300 I2C_ADRS &= ~0x08; /* enable RS-232C */ 301 #endif 302 } 303 304 305 /* 306 * sci_putc 307 * : unsigned char c; 308 */ 309 void 310 sci_putc(unsigned char c) 311 { 312 313 /* wait for ready */ 314 while ((SHREG_SCSSR & SCSSR_TDRE) == 0) 315 ; 316 317 /* write send data to send register */ 318 SHREG_SCTDR = c; 319 320 /* clear ready flag */ 321 SHREG_SCSSR &= ~SCSSR_TDRE; 322 } 323 324 /* 325 * : SciErrCheck 326 * 0x20 = over run 327 * 0x10 = frame error 328 * 0x80 = parity error 329 */ 330 int 331 SciErrCheck(void) 332 { 333 334 return(SHREG_SCSSR & (SCSSR_ORER | SCSSR_FER | SCSSR_PER)); 335 } 336 337 /* 338 * sci_getc 339 */ 340 unsigned char 341 sci_getc(void) 342 { 343 unsigned char c, err_c; 344 345 while (((err_c = SHREG_SCSSR) 346 & (SCSSR_RDRF | SCSSR_ORER | SCSSR_FER | SCSSR_PER)) == 0) 347 ; 348 if ((err_c & (SCSSR_ORER | SCSSR_FER | SCSSR_PER)) != 0) { 349 SHREG_SCSSR &= ~(SCSSR_ORER | SCSSR_FER | SCSSR_PER); 350 return(err_c |= 0x80); 351 } 352 353 c = SHREG_SCRDR; 354 355 SHREG_SCSSR &= ~SCSSR_RDRF; 356 357 return(c); 358 } 359 360 static int 361 sci_match(device_t parent, cfdata_t cf, void *aux) 362 { 363 364 if (strcmp(cf->cf_name, "sci") || sci_attached) 365 return 0; 366 367 return 1; 368 } 369 370 static void 371 sci_attach(device_t parent, device_t self, void *aux) 372 { 373 struct sci_softc *sc = device_private(self); 374 struct tty *tp; 375 376 sci_attached = 1; 377 378 sc->sc_dev = self; 379 sc->sc_hwflags = 0; /* XXX */ 380 sc->sc_swflags = 0; /* XXX */ 381 sc->sc_fifolen = 0; /* XXX */ 382 383 if (sciisconsole) { 384 SET(sc->sc_hwflags, SCI_HW_CONSOLE); 385 SET(sc->sc_swflags, TIOCFLAG_SOFTCAR); 386 printf("\n%s: console\n", device_xname(self)); 387 } else { 388 InitializeSci(9600); 389 printf("\n"); 390 } 391 392 callout_init(&sc->sc_diag_ch, 0); 393 394 intc_intr_establish(SH_INTEVT_SCI_ERI, IST_LEVEL, IPL_SERIAL, sciintr, 395 sc); 396 intc_intr_establish(SH_INTEVT_SCI_RXI, IST_LEVEL, IPL_SERIAL, sciintr, 397 sc); 398 intc_intr_establish(SH_INTEVT_SCI_TXI, IST_LEVEL, IPL_SERIAL, sciintr, 399 sc); 400 intc_intr_establish(SH_INTEVT_SCI_TEI, IST_LEVEL, IPL_SERIAL, sciintr, 401 sc); 402 403 sc->sc_si = softint_establish(SOFTINT_SERIAL, scisoft, sc); 404 SET(sc->sc_hwflags, SCI_HW_DEV_OK); 405 406 tp = tty_alloc(); 407 tp->t_oproc = scistart; 408 tp->t_param = sciparam; 409 tp->t_hwiflow = NULL; 410 411 sc->sc_tty = tp; 412 sc->sc_rbuf = malloc(sci_rbuf_size << 1, M_DEVBUF, M_NOWAIT); 413 if (sc->sc_rbuf == NULL) { 414 printf("%s: unable to allocate ring buffer\n", 415 device_xname(self)); 416 return; 417 } 418 sc->sc_ebuf = sc->sc_rbuf + (sci_rbuf_size << 1); 419 420 tty_attach(tp); 421 } 422 423 /* 424 * Start or restart transmission. 425 */ 426 static void 427 scistart(struct tty *tp) 428 { 429 struct sci_softc *sc = device_lookup_private(&sci_cd,SCIUNIT(tp->t_dev)); 430 int s; 431 432 s = spltty(); 433 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 434 goto out; 435 if (sc->sc_tx_stopped) 436 goto out; 437 if (!ttypull(tp)) 438 goto out; 439 440 /* Grab the first contiguous region of buffer space. */ 441 { 442 u_char *tba; 443 int tbc; 444 445 tba = tp->t_outq.c_cf; 446 tbc = ndqb(&tp->t_outq, 0); 447 448 (void)splserial(); 449 450 sc->sc_tba = tba; 451 sc->sc_tbc = tbc; 452 } 453 454 SET(tp->t_state, TS_BUSY); 455 sc->sc_tx_busy = 1; 456 457 /* Enable transmit completion interrupts if necessary. */ 458 SHREG_SCSCR |= SCSCR_TIE | SCSCR_RIE; 459 460 /* Output the first byte of the contiguous buffer. */ 461 { 462 if (sc->sc_tbc > 0) { 463 sci_putc(*(sc->sc_tba)); 464 sc->sc_tba++; 465 sc->sc_tbc--; 466 } 467 } 468 out: 469 splx(s); 470 return; 471 } 472 473 /* 474 * Set SCI tty parameters from termios. 475 * XXX - Should just copy the whole termios after 476 * making sure all the changes could be done. 477 */ 478 static int 479 sciparam(struct tty *tp, struct termios *t) 480 { 481 struct sci_softc *sc = device_lookup_private(&sci_cd, SCIUNIT(tp->t_dev)); 482 int ospeed = t->c_ospeed; 483 int s; 484 485 if (!device_is_active(sc->sc_dev)) 486 return (EIO); 487 488 /* Check requested parameters. */ 489 if (ospeed < 0) 490 return (EINVAL); 491 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 492 return (EINVAL); 493 494 /* 495 * For the console, always force CLOCAL and !HUPCL, so that the port 496 * is always active. 497 */ 498 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) || 499 ISSET(sc->sc_hwflags, SCI_HW_CONSOLE)) { 500 SET(t->c_cflag, CLOCAL); 501 CLR(t->c_cflag, HUPCL); 502 } 503 504 /* 505 * If there were no changes, don't do anything. This avoids dropping 506 * input and improves performance when all we did was frob things like 507 * VMIN and VTIME. 508 */ 509 if (tp->t_ospeed == t->c_ospeed && 510 tp->t_cflag == t->c_cflag) 511 return (0); 512 513 #if 0 514 /* XXX (msaitoh) */ 515 lcr = ISSET(sc->sc_lcr, LCR_SBREAK) | cflag2lcr(t->c_cflag); 516 #endif 517 518 s = splserial(); 519 520 /* 521 * Set the FIFO threshold based on the receive speed. 522 * 523 * * If it's a low speed, it's probably a mouse or some other 524 * interactive device, so set the threshold low. 525 * * If it's a high speed, trim the trigger level down to prevent 526 * overflows. 527 * * Otherwise set it a bit higher. 528 */ 529 #if 0 530 /* XXX (msaitoh) */ 531 if (ISSET(sc->sc_hwflags, SCI_HW_HAYESP)) 532 sc->sc_fifo = FIFO_DMA_MODE | FIFO_ENABLE | FIFO_TRIGGER_8; 533 else if (ISSET(sc->sc_hwflags, SCI_HW_FIFO)) 534 sc->sc_fifo = FIFO_ENABLE | 535 (t->c_ospeed <= 1200 ? FIFO_TRIGGER_1 : 536 t->c_ospeed <= 38400 ? FIFO_TRIGGER_8 : FIFO_TRIGGER_4); 537 else 538 sc->sc_fifo = 0; 539 #endif 540 541 /* And copy to tty. */ 542 tp->t_ispeed = 0; 543 tp->t_ospeed = t->c_ospeed; 544 tp->t_cflag = t->c_cflag; 545 546 if (!sc->sc_heldchange) { 547 if (sc->sc_tx_busy) { 548 sc->sc_heldtbc = sc->sc_tbc; 549 sc->sc_tbc = 0; 550 sc->sc_heldchange = 1; 551 } 552 #if 0 553 /* XXX (msaitoh) */ 554 else 555 sci_loadchannelregs(sc); 556 #endif 557 } 558 559 if (!ISSET(t->c_cflag, CHWFLOW)) { 560 /* Disable the high water mark. */ 561 sc->sc_r_hiwat = 0; 562 sc->sc_r_lowat = 0; 563 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 564 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 565 sci_schedrx(sc); 566 } 567 } else { 568 sc->sc_r_hiwat = sci_rbuf_hiwat; 569 sc->sc_r_lowat = sci_rbuf_lowat; 570 } 571 572 splx(s); 573 574 #ifdef SCI_DEBUG 575 if (sci_debug) 576 scistatus(sc, "sciparam "); 577 #endif 578 579 if (!ISSET(t->c_cflag, CHWFLOW)) { 580 if (sc->sc_tx_stopped) { 581 sc->sc_tx_stopped = 0; 582 scistart(tp); 583 } 584 } 585 586 return (0); 587 } 588 589 void 590 sci_iflush(struct sci_softc *sc) 591 { 592 unsigned char err_c; 593 volatile unsigned char c; 594 595 if (((err_c = SHREG_SCSSR) 596 & (SCSSR_RDRF | SCSSR_ORER | SCSSR_FER | SCSSR_PER)) != 0) { 597 598 if ((err_c & (SCSSR_ORER | SCSSR_FER | SCSSR_PER)) != 0) { 599 SHREG_SCSSR &= ~(SCSSR_ORER | SCSSR_FER | SCSSR_PER); 600 return; 601 } 602 603 c = SHREG_SCRDR; 604 605 SHREG_SCSSR &= ~SCSSR_RDRF; 606 } 607 } 608 609 int 610 sciopen(dev_t dev, int flag, int mode, struct lwp *l) 611 { 612 struct sci_softc *sc; 613 struct tty *tp; 614 int s, s2; 615 int error; 616 617 sc = device_lookup_private(&sci_cd, SCIUNIT(dev)); 618 if (sc == 0 || !ISSET(sc->sc_hwflags, SCI_HW_DEV_OK) || 619 sc->sc_rbuf == NULL) 620 return (ENXIO); 621 622 if (!device_is_active(sc->sc_dev)) 623 return (ENXIO); 624 625 #ifdef KGDB 626 /* 627 * If this is the kgdb port, no other use is permitted. 628 */ 629 if (ISSET(sc->sc_hwflags, SCI_HW_KGDB)) 630 return (EBUSY); 631 #endif 632 633 tp = sc->sc_tty; 634 635 if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp)) 636 return (EBUSY); 637 638 s = spltty(); 639 640 /* 641 * Do the following iff this is a first open. 642 */ 643 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 644 struct termios t; 645 646 tp->t_dev = dev; 647 648 s2 = splserial(); 649 650 /* Turn on interrupts. */ 651 SHREG_SCSCR |= SCSCR_TIE | SCSCR_RIE; 652 653 splx(s2); 654 655 /* 656 * Initialize the termios status to the defaults. Add in the 657 * sticky bits from TIOCSFLAGS. 658 */ 659 t.c_ispeed = 0; 660 if (ISSET(sc->sc_hwflags, SCI_HW_CONSOLE)) { 661 t.c_ospeed = scicn_speed; 662 t.c_cflag = sciconscflag; 663 } else { 664 t.c_ospeed = TTYDEF_SPEED; 665 t.c_cflag = TTYDEF_CFLAG; 666 } 667 if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL)) 668 SET(t.c_cflag, CLOCAL); 669 if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)) 670 SET(t.c_cflag, CRTSCTS); 671 if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF)) 672 SET(t.c_cflag, MDMBUF); 673 /* Make sure sciparam() will do something. */ 674 tp->t_ospeed = 0; 675 (void) sciparam(tp, &t); 676 tp->t_iflag = TTYDEF_IFLAG; 677 tp->t_oflag = TTYDEF_OFLAG; 678 tp->t_lflag = TTYDEF_LFLAG; 679 ttychars(tp); 680 ttsetwater(tp); 681 682 s2 = splserial(); 683 684 /* Clear the input ring, and unblock. */ 685 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 686 sc->sc_rbavail = sci_rbuf_size; 687 sci_iflush(sc); 688 CLR(sc->sc_rx_flags, RX_ANY_BLOCK); 689 #if 0 690 /* XXX (msaitoh) */ 691 sci_hwiflow(sc); 692 #endif 693 694 #ifdef SCI_DEBUG 695 if (sci_debug) 696 scistatus(sc, "sciopen "); 697 #endif 698 699 splx(s2); 700 } 701 702 splx(s); 703 704 error = ttyopen(tp, SCIDIALOUT(dev), ISSET(flag, O_NONBLOCK)); 705 if (error) 706 goto bad; 707 708 error = (*tp->t_linesw->l_open)(dev, tp); 709 if (error) 710 goto bad; 711 712 return (0); 713 714 bad: 715 716 return (error); 717 } 718 719 int 720 sciclose(dev_t dev, int flag, int mode, struct lwp *l) 721 { 722 struct sci_softc *sc = device_lookup_private(&sci_cd, SCIUNIT(dev)); 723 struct tty *tp = sc->sc_tty; 724 725 /* XXX This is for cons.c. */ 726 if (!ISSET(tp->t_state, TS_ISOPEN)) 727 return (0); 728 729 (*tp->t_linesw->l_close)(tp, flag); 730 ttyclose(tp); 731 732 if (!device_is_active(sc->sc_dev)) 733 return (0); 734 735 return (0); 736 } 737 738 int 739 sciread(dev_t dev, struct uio *uio, int flag) 740 { 741 struct sci_softc *sc = device_lookup_private(&sci_cd, SCIUNIT(dev)); 742 struct tty *tp = sc->sc_tty; 743 744 return ((*tp->t_linesw->l_read)(tp, uio, flag)); 745 } 746 747 int 748 sciwrite(dev_t dev, struct uio *uio, int flag) 749 { 750 struct sci_softc *sc = device_lookup_private(&sci_cd, SCIUNIT(dev)); 751 struct tty *tp = sc->sc_tty; 752 753 return ((*tp->t_linesw->l_write)(tp, uio, flag)); 754 } 755 756 int 757 scipoll(dev_t dev, int events, struct lwp *l) 758 { 759 struct sci_softc *sc = device_lookup_private(&sci_cd, SCIUNIT(dev)); 760 struct tty *tp = sc->sc_tty; 761 762 return ((*tp->t_linesw->l_poll)(tp, events, l)); 763 } 764 765 struct tty * 766 scitty(dev_t dev) 767 { 768 struct sci_softc *sc = device_lookup_private(&sci_cd, SCIUNIT(dev)); 769 struct tty *tp = sc->sc_tty; 770 771 return (tp); 772 } 773 774 int 775 sciioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 776 { 777 struct sci_softc *sc = device_lookup_private(&sci_cd, SCIUNIT(dev)); 778 struct tty *tp = sc->sc_tty; 779 int error; 780 int s; 781 782 if (!device_is_active(sc->sc_dev)) 783 return (EIO); 784 785 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 786 if (error != EPASSTHROUGH) 787 return (error); 788 789 error = ttioctl(tp, cmd, data, flag, l); 790 if (error != EPASSTHROUGH) 791 return (error); 792 793 error = 0; 794 795 s = splserial(); 796 797 switch (cmd) { 798 case TIOCSBRK: 799 sci_break(sc, 1); 800 break; 801 802 case TIOCCBRK: 803 sci_break(sc, 0); 804 break; 805 806 case TIOCGFLAGS: 807 *(int *)data = sc->sc_swflags; 808 break; 809 810 case TIOCSFLAGS: 811 error = kauth_authorize_device_tty(l->l_cred, 812 KAUTH_DEVICE_TTY_PRIVSET, tp); 813 if (error) 814 break; 815 sc->sc_swflags = *(int *)data; 816 break; 817 818 default: 819 error = EPASSTHROUGH; 820 break; 821 } 822 823 splx(s); 824 825 return (error); 826 } 827 828 integrate void 829 sci_schedrx(struct sci_softc *sc) 830 { 831 832 sc->sc_rx_ready = 1; 833 834 /* Wake up the poller. */ 835 softint_schedule(sc->sc_si); 836 } 837 838 void 839 sci_break(struct sci_softc *sc, int onoff) 840 { 841 842 if (onoff) 843 SHREG_SCSSR &= ~SCSSR_TDRE; 844 else 845 SHREG_SCSSR |= SCSSR_TDRE; 846 847 #if 0 /* XXX */ 848 if (!sc->sc_heldchange) { 849 if (sc->sc_tx_busy) { 850 sc->sc_heldtbc = sc->sc_tbc; 851 sc->sc_tbc = 0; 852 sc->sc_heldchange = 1; 853 } else 854 sci_loadchannelregs(sc); 855 } 856 #endif 857 } 858 859 /* 860 * Stop output, e.g., for ^S or output flush. 861 */ 862 void 863 scistop(struct tty *tp, int flag) 864 { 865 struct sci_softc *sc = device_lookup_private(&sci_cd, SCIUNIT(tp->t_dev)); 866 int s; 867 868 s = splserial(); 869 if (ISSET(tp->t_state, TS_BUSY)) { 870 /* Stop transmitting at the next chunk. */ 871 sc->sc_tbc = 0; 872 sc->sc_heldtbc = 0; 873 if (!ISSET(tp->t_state, TS_TTSTOP)) 874 SET(tp->t_state, TS_FLUSH); 875 } 876 splx(s); 877 } 878 879 void 880 scidiag(void *arg) 881 { 882 struct sci_softc *sc = arg; 883 int overflows, floods; 884 int s; 885 886 s = splserial(); 887 overflows = sc->sc_overflows; 888 sc->sc_overflows = 0; 889 floods = sc->sc_floods; 890 sc->sc_floods = 0; 891 sc->sc_errors = 0; 892 splx(s); 893 894 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 895 device_xname(sc->sc_dev), 896 overflows, overflows == 1 ? "" : "s", 897 floods, floods == 1 ? "" : "s"); 898 } 899 900 integrate void 901 sci_rxsoft(struct sci_softc *sc, struct tty *tp) 902 { 903 int (*rint)(int, struct tty *) = tp->t_linesw->l_rint; 904 u_char *get, *end; 905 u_int cc, scc; 906 u_char ssr; 907 int code; 908 int s; 909 910 end = sc->sc_ebuf; 911 get = sc->sc_rbget; 912 scc = cc = sci_rbuf_size - sc->sc_rbavail; 913 914 if (cc == sci_rbuf_size) { 915 sc->sc_floods++; 916 if (sc->sc_errors++ == 0) 917 callout_reset(&sc->sc_diag_ch, 60 * hz, scidiag, sc); 918 } 919 920 while (cc) { 921 code = get[0]; 922 ssr = get[1]; 923 if (ISSET(ssr, SCSSR_FER | SCSSR_PER)) { 924 if (ISSET(ssr, SCSSR_FER)) 925 SET(code, TTY_FE); 926 if (ISSET(ssr, SCSSR_PER)) 927 SET(code, TTY_PE); 928 } 929 if ((*rint)(code, tp) == -1) { 930 /* 931 * The line discipline's buffer is out of space. 932 */ 933 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 934 /* 935 * We're either not using flow control, or the 936 * line discipline didn't tell us to block for 937 * some reason. Either way, we have no way to 938 * know when there's more space available, so 939 * just drop the rest of the data. 940 */ 941 get += cc << 1; 942 if (get >= end) 943 get -= sci_rbuf_size << 1; 944 cc = 0; 945 } else { 946 /* 947 * Don't schedule any more receive processing 948 * until the line discipline tells us there's 949 * space available (through scihwiflow()). 950 * Leave the rest of the data in the input 951 * buffer. 952 */ 953 SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 954 } 955 break; 956 } 957 get += 2; 958 if (get >= end) 959 get = sc->sc_rbuf; 960 cc--; 961 } 962 963 if (cc != scc) { 964 sc->sc_rbget = get; 965 s = splserial(); 966 cc = sc->sc_rbavail += scc - cc; 967 /* Buffers should be ok again, release possible block. */ 968 if (cc >= sc->sc_r_lowat) { 969 if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 970 CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 971 SHREG_SCSCR |= SCSCR_RIE; 972 } 973 #if 0 974 if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) { 975 CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED); 976 sci_hwiflow(sc); 977 } 978 #endif 979 } 980 splx(s); 981 } 982 } 983 984 integrate void 985 sci_txsoft(struct sci_softc *sc, struct tty *tp) 986 { 987 988 CLR(tp->t_state, TS_BUSY); 989 if (ISSET(tp->t_state, TS_FLUSH)) 990 CLR(tp->t_state, TS_FLUSH); 991 else 992 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf)); 993 (*tp->t_linesw->l_start)(tp); 994 } 995 996 integrate void 997 sci_stsoft(struct sci_softc *sc, struct tty *tp) 998 { 999 #if 0 1000 /* XXX (msaitoh) */ 1001 u_char msr, delta; 1002 int s; 1003 1004 s = splserial(); 1005 msr = sc->sc_msr; 1006 delta = sc->sc_msr_delta; 1007 sc->sc_msr_delta = 0; 1008 splx(s); 1009 1010 if (ISSET(delta, sc->sc_msr_dcd)) { 1011 /* 1012 * Inform the tty layer that carrier detect changed. 1013 */ 1014 (void) (*tp->t_linesw->l_modem)(tp, ISSET(msr, MSR_DCD)); 1015 } 1016 1017 if (ISSET(delta, sc->sc_msr_cts)) { 1018 /* Block or unblock output according to flow control. */ 1019 if (ISSET(msr, sc->sc_msr_cts)) { 1020 sc->sc_tx_stopped = 0; 1021 (*tp->t_linesw->l_start)(tp); 1022 } else { 1023 sc->sc_tx_stopped = 1; 1024 } 1025 } 1026 1027 #ifdef SCI_DEBUG 1028 if (sci_debug) 1029 scistatus(sc, "sci_stsoft"); 1030 #endif 1031 #endif 1032 } 1033 1034 void 1035 scisoft(void *arg) 1036 { 1037 struct sci_softc *sc = arg; 1038 struct tty *tp; 1039 1040 if (!device_is_active(sc->sc_dev)) 1041 return; 1042 1043 tp = sc->sc_tty; 1044 1045 if (sc->sc_rx_ready) { 1046 sc->sc_rx_ready = 0; 1047 sci_rxsoft(sc, tp); 1048 } 1049 1050 #if 0 1051 if (sc->sc_st_check) { 1052 sc->sc_st_check = 0; 1053 sci_stsoft(sc, tp); 1054 } 1055 #endif 1056 1057 if (sc->sc_tx_done) { 1058 sc->sc_tx_done = 0; 1059 sci_txsoft(sc, tp); 1060 } 1061 } 1062 1063 int 1064 sciintr(void *arg) 1065 { 1066 struct sci_softc *sc = arg; 1067 u_char *put, *end; 1068 u_int cc; 1069 u_short ssr; 1070 1071 if (!device_is_active(sc->sc_dev)) 1072 return (0); 1073 1074 end = sc->sc_ebuf; 1075 put = sc->sc_rbput; 1076 cc = sc->sc_rbavail; 1077 1078 do { 1079 ssr = SHREG_SCSSR; 1080 if (ISSET(ssr, SCSSR_FER)) { 1081 SHREG_SCSSR &= ~(SCSSR_ORER | SCSSR_PER | SCSSR_FER); 1082 #if defined(DDB) || defined(KGDB) 1083 #ifdef SH4 1084 if ((SHREG_SCSPTR & SCSPTR_SPB0DT) != 0) { 1085 #else 1086 if ((SHREG_SCSPDR & SCSPDR_SCP0DT) != 0) { 1087 #endif 1088 #ifdef DDB 1089 if (ISSET(sc->sc_hwflags, SCI_HW_CONSOLE)) { 1090 console_debugger(); 1091 } 1092 #endif 1093 #ifdef KGDB 1094 if (ISSET(sc->sc_hwflags, SCI_HW_KGDB)) { 1095 kgdb_connect(1); 1096 } 1097 #endif 1098 } 1099 #endif /* DDB || KGDB */ 1100 } 1101 if ((SHREG_SCSSR & SCSSR_RDRF) != 0) { 1102 if (cc > 0) { 1103 put[0] = SHREG_SCRDR; 1104 put[1] = SHREG_SCSSR & 0x00ff; 1105 1106 put += 2; 1107 if (put >= end) 1108 put = sc->sc_rbuf; 1109 cc--; 1110 } 1111 1112 SHREG_SCSSR &= ~(SCSSR_ORER | SCSSR_FER | SCSSR_PER | 1113 SCSSR_RDRF); 1114 1115 /* 1116 * Current string of incoming characters ended because 1117 * no more data was available or we ran out of space. 1118 * Schedule a receive event if any data was received. 1119 * If we're out of space, turn off receive interrupts. 1120 */ 1121 sc->sc_rbput = put; 1122 sc->sc_rbavail = cc; 1123 if (!ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) 1124 sc->sc_rx_ready = 1; 1125 1126 /* 1127 * See if we are in danger of overflowing a buffer. If 1128 * so, use hardware flow control to ease the pressure. 1129 */ 1130 if (!ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED) && 1131 cc < sc->sc_r_hiwat) { 1132 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1133 #if 0 1134 sci_hwiflow(sc); 1135 #endif 1136 } 1137 1138 /* 1139 * If we're out of space, disable receive interrupts 1140 * until the queue has drained a bit. 1141 */ 1142 if (!cc) { 1143 SET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1144 SHREG_SCSCR &= ~SCSCR_RIE; 1145 } 1146 } else { 1147 if (SHREG_SCSSR & SCSSR_RDRF) { 1148 SHREG_SCSCR &= ~(SCSCR_TIE | SCSCR_RIE); 1149 delay(10); 1150 SHREG_SCSCR |= SCSCR_TIE | SCSCR_RIE; 1151 continue; 1152 } 1153 } 1154 } while (SHREG_SCSSR & SCSSR_RDRF); 1155 1156 #if 0 1157 msr = bus_space_read_1(iot, ioh, sci_msr); 1158 delta = msr ^ sc->sc_msr; 1159 sc->sc_msr = msr; 1160 if (ISSET(delta, sc->sc_msr_mask)) { 1161 SET(sc->sc_msr_delta, delta); 1162 1163 /* 1164 * Pulse-per-second clock signal on edge of DCD? 1165 */ 1166 if (ISSET(delta, sc->sc_ppsmask)) { 1167 struct timeval tv; 1168 if (ISSET(msr, sc->sc_ppsmask) == 1169 sc->sc_ppsassert) { 1170 /* XXX nanotime() */ 1171 microtime(&tv); 1172 TIMEVAL_TO_TIMESPEC(&tv, 1173 &sc->ppsinfo.assert_timestamp); 1174 if (sc->ppsparam.mode & PPS_OFFSETASSERT) { 1175 timespecadd(&sc->ppsinfo.assert_timestamp, 1176 &sc->ppsparam.assert_offset, 1177 &sc->ppsinfo.assert_timestamp); 1178 TIMESPEC_TO_TIMEVAL(&tv, &sc->ppsinfo.assert_timestamp); 1179 } 1180 1181 #ifdef PPS_SYNC 1182 if (sc->ppsparam.mode & PPS_HARDPPSONASSERT) 1183 hardpps(&tv, tv.tv_usec); 1184 #endif 1185 sc->ppsinfo.assert_sequence++; 1186 sc->ppsinfo.current_mode = 1187 sc->ppsparam.mode; 1188 1189 } else if (ISSET(msr, sc->sc_ppsmask) == 1190 sc->sc_ppsclear) { 1191 /* XXX nanotime() */ 1192 microtime(&tv); 1193 TIMEVAL_TO_TIMESPEC(&tv, 1194 &sc->ppsinfo.clear_timestamp); 1195 if (sc->ppsparam.mode & PPS_OFFSETCLEAR) { 1196 timespecadd(&sc->ppsinfo.clear_timestamp, 1197 &sc->ppsparam.clear_offset, 1198 &sc->ppsinfo.clear_timestamp); 1199 TIMESPEC_TO_TIMEVAL(&tv, &sc->ppsinfo.clear_timestamp); 1200 } 1201 1202 #ifdef PPS_SYNC 1203 if (sc->ppsparam.mode & PPS_HARDPPSONCLEAR) 1204 hardpps(&tv, tv.tv_usec); 1205 #endif 1206 sc->ppsinfo.clear_sequence++; 1207 sc->ppsinfo.current_mode = 1208 sc->ppsparam.mode; 1209 } 1210 } 1211 1212 /* 1213 * Stop output immediately if we lose the output 1214 * flow control signal or carrier detect. 1215 */ 1216 if (ISSET(~msr, sc->sc_msr_mask)) { 1217 sc->sc_tbc = 0; 1218 sc->sc_heldtbc = 0; 1219 #ifdef SCI_DEBUG 1220 if (sci_debug) 1221 scistatus(sc, "sciintr "); 1222 #endif 1223 } 1224 1225 sc->sc_st_check = 1; 1226 } 1227 #endif 1228 1229 /* 1230 * Done handling any receive interrupts. See if data can be 1231 * transmitted as well. Schedule tx done event if no data left 1232 * and tty was marked busy. 1233 */ 1234 if ((SHREG_SCSSR & SCSSR_TDRE) != 0) { 1235 /* 1236 * If we've delayed a parameter change, do it now, and restart 1237 * output. 1238 */ 1239 if (sc->sc_heldchange) { 1240 sc->sc_heldchange = 0; 1241 sc->sc_tbc = sc->sc_heldtbc; 1242 sc->sc_heldtbc = 0; 1243 } 1244 1245 /* Output the next chunk of the contiguous buffer, if any. */ 1246 if (sc->sc_tbc > 0) { 1247 sci_putc(*(sc->sc_tba)); 1248 sc->sc_tba++; 1249 sc->sc_tbc--; 1250 } else { 1251 /* Disable transmit completion interrupts if necessary. */ 1252 #if 0 1253 if (ISSET(sc->sc_ier, IER_ETXRDY)) 1254 #endif 1255 SHREG_SCSCR &= ~SCSCR_TIE; 1256 1257 if (sc->sc_tx_busy) { 1258 sc->sc_tx_busy = 0; 1259 sc->sc_tx_done = 1; 1260 } 1261 } 1262 } 1263 1264 /* Wake up the poller. */ 1265 softint_schedule(sc->sc_si); 1266 1267 #ifdef RND_SCI 1268 rnd_add_uint32(&sc->rnd_source, iir | lsr); 1269 #endif 1270 1271 return (1); 1272 } 1273 1274 void 1275 scicnprobe(struct consdev *cp) 1276 { 1277 int maj; 1278 1279 /* locate the major number */ 1280 maj = cdevsw_lookup_major(&sci_cdevsw); 1281 1282 /* Initialize required fields. */ 1283 cp->cn_dev = makedev(maj, 0); 1284 #ifdef SCICONSOLE 1285 cp->cn_pri = CN_REMOTE; 1286 #else 1287 cp->cn_pri = CN_NORMAL; 1288 #endif 1289 } 1290 1291 void 1292 scicninit(struct consdev *cp) 1293 { 1294 1295 InitializeSci(scicn_speed); 1296 sciisconsole = 1; 1297 } 1298 1299 int 1300 scicngetc(dev_t dev) 1301 { 1302 int c; 1303 int s; 1304 1305 s = splserial(); 1306 c = sci_getc(); 1307 splx(s); 1308 1309 return (c); 1310 } 1311 1312 void 1313 scicnputc(dev_t dev, int c) 1314 { 1315 int s; 1316 1317 s = splserial(); 1318 sci_putc((u_char)c); 1319 splx(s); 1320 } 1321
Indexes created Tue Sep 23 14:10:03 GMT 2025