1 /* $NetBSD: sci.c,v 1.65 2023/09/17 14:22:28 andvar 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 1.65 2023/09/17 14:22:28 andvar 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/kmem.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 #ifdef SCI_DEBUG 123 int sci_debug = 1; 124 #define DPRINTF(x) if (sci_debug) printf x 125 #else 126 #define DPRINTF(x) 127 #endif 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 device_t 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(device_t, cfdata_t, void *); 192 static void sci_attach(device_t, device_t, 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(x) TTUNIT(x) 207 #define SCIDIALOUT(x) TTDIALOUT(x) 208 209 /* Hardware flag masks */ 210 #define SCI_HW_NOIEN 0x01 211 #define SCI_HW_FIFO 0x02 212 #define SCI_HW_FLOW 0x08 213 #define SCI_HW_DEV_OK 0x20 214 #define SCI_HW_CONSOLE 0x40 215 #define SCI_HW_KGDB 0x80 216 217 /* Buffer size for character buffer */ 218 #define SCI_RING_SIZE 2048 219 220 /* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 221 u_int sci_rbuf_hiwat = (SCI_RING_SIZE * 1) / 4; 222 u_int sci_rbuf_lowat = (SCI_RING_SIZE * 3) / 4; 223 224 #define CONMODE ((TTYDEF_CFLAG & ~(CSIZE | CSTOPB | PARENB)) | CS8) /* 8N1 */ 225 int sciconscflag = CONMODE; 226 int sciisconsole = 0; 227 228 #ifdef SCICN_SPEED 229 int scicn_speed = SCICN_SPEED; 230 #else 231 int scicn_speed = 9600; 232 #endif 233 234 #define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */ 235 236 u_int sci_rbuf_size = SCI_RING_SIZE; 237 238 CFATTACH_DECL_NEW(sci, sizeof(struct sci_softc), 239 sci_match, sci_attach, NULL, NULL); 240 241 extern struct cfdriver sci_cd; 242 243 static int sci_attached; 244 245 dev_type_open(sciopen); 246 dev_type_close(sciclose); 247 dev_type_read(sciread); 248 dev_type_write(sciwrite); 249 dev_type_ioctl(sciioctl); 250 dev_type_stop(scistop); 251 dev_type_tty(scitty); 252 dev_type_poll(scipoll); 253 254 const struct cdevsw sci_cdevsw = { 255 .d_open = sciopen, 256 .d_close = sciclose, 257 .d_read = sciread, 258 .d_write = sciwrite, 259 .d_ioctl = sciioctl, 260 .d_stop = scistop, 261 .d_tty = scitty, 262 .d_poll = scipoll, 263 .d_mmap = nommap, 264 .d_kqfilter = ttykqfilter, 265 .d_discard = nodiscard, 266 .d_flag = D_TTY 267 }; 268 269 void InitializeSci (unsigned int); 270 271 /* 272 * following functions are debugging prupose only 273 */ 274 #define CR 0x0D 275 #define I2C_ADRS (*(volatile unsigned int *)0xa8000000) 276 #define USART_ON (unsigned int)~0x08 277 278 void sci_putc(unsigned char); 279 unsigned char sci_getc(void); 280 int SciErrCheck(void); 281 282 /* 283 * InitializeSci 284 * : unsigned int bps; 285 * : SCI(Serial Communication Interface) 286 */ 287 288 void 289 InitializeSci(unsigned int bps) 290 { 291 292 /* Initialize SCR */ 293 SHREG_SCSCR = 0x00; 294 295 /* Serial Mode Register */ 296 SHREG_SCSMR = 0x00; /* Async,8bit,NonParity,Even,1Stop,NoMulti */ 297 298 /* Bit Rate Register */ 299 SHREG_SCBRR = divrnd(sh_clock_get_pclock(), 32 * bps) - 1; 300 301 /* 302 * wait 1mSec, because Send/Recv must begin 1 bit period after 303 * BRR is set. 304 */ 305 delay(1000); 306 307 /* Send permission, Receive permission ON */ 308 SHREG_SCSCR = SCSCR_TE | SCSCR_RE; 309 310 /* Serial Status Register */ 311 SHREG_SCSSR &= SCSSR_TDRE; /* Clear Status */ 312 313 #if 0 314 I2C_ADRS &= ~0x08; /* enable RS-232C */ 315 #endif 316 } 317 318 319 /* 320 * sci_putc 321 * : unsigned char c; 322 */ 323 void 324 sci_putc(unsigned char c) 325 { 326 327 /* wait for ready */ 328 while ((SHREG_SCSSR & SCSSR_TDRE) == 0) 329 ; 330 331 /* write send data to send register */ 332 SHREG_SCTDR = c; 333 334 /* clear ready flag */ 335 SHREG_SCSSR &= ~SCSSR_TDRE; 336 } 337 338 /* 339 * : SciErrCheck 340 * 0x20 = over run 341 * 0x10 = frame error 342 * 0x80 = parity error 343 */ 344 int 345 SciErrCheck(void) 346 { 347 348 return(SHREG_SCSSR & (SCSSR_ORER | SCSSR_FER | SCSSR_PER)); 349 } 350 351 /* 352 * sci_getc 353 */ 354 unsigned char 355 sci_getc(void) 356 { 357 unsigned char c, err_c; 358 359 while (((err_c = SHREG_SCSSR) 360 & (SCSSR_RDRF | SCSSR_ORER | SCSSR_FER | SCSSR_PER)) == 0) 361 ; 362 if ((err_c & (SCSSR_ORER | SCSSR_FER | SCSSR_PER)) != 0) { 363 SHREG_SCSSR &= ~(SCSSR_ORER | SCSSR_FER | SCSSR_PER); 364 return(err_c |= 0x80); 365 } 366 367 c = SHREG_SCRDR; 368 369 SHREG_SCSSR &= ~SCSSR_RDRF; 370 371 return(c); 372 } 373 374 static int 375 sci_match(device_t parent, cfdata_t cf, void *aux) 376 { 377 378 if (strcmp(cf->cf_name, "sci") || sci_attached) 379 return 0; 380 381 return 1; 382 } 383 384 static void 385 sci_attach(device_t parent, device_t self, void *aux) 386 { 387 struct sci_softc *sc = device_private(self); 388 struct tty *tp; 389 390 sci_attached = 1; 391 392 sc->sc_dev = self; 393 sc->sc_hwflags = 0; /* XXX */ 394 sc->sc_swflags = 0; /* XXX */ 395 sc->sc_fifolen = 0; /* XXX */ 396 397 if (sciisconsole) { 398 SET(sc->sc_hwflags, SCI_HW_CONSOLE); 399 SET(sc->sc_swflags, TIOCFLAG_SOFTCAR); 400 printf("\n%s: console\n", device_xname(self)); 401 } else { 402 InitializeSci(9600); 403 printf("\n"); 404 } 405 406 callout_init(&sc->sc_diag_ch, 0); 407 408 intc_intr_establish(SH_INTEVT_SCI_ERI, IST_LEVEL, IPL_SERIAL, sciintr, 409 sc); 410 intc_intr_establish(SH_INTEVT_SCI_RXI, IST_LEVEL, IPL_SERIAL, sciintr, 411 sc); 412 intc_intr_establish(SH_INTEVT_SCI_TXI, IST_LEVEL, IPL_SERIAL, sciintr, 413 sc); 414 intc_intr_establish(SH_INTEVT_SCI_TEI, IST_LEVEL, IPL_SERIAL, sciintr, 415 sc); 416 417 sc->sc_si = softint_establish(SOFTINT_SERIAL, scisoft, sc); 418 SET(sc->sc_hwflags, SCI_HW_DEV_OK); 419 420 tp = tty_alloc(); 421 tp->t_oproc = scistart; 422 tp->t_param = sciparam; 423 tp->t_hwiflow = NULL; 424 425 sc->sc_tty = tp; 426 sc->sc_rbuf = kmem_alloc(sci_rbuf_size << 1, KM_SLEEP); 427 sc->sc_ebuf = sc->sc_rbuf + (sci_rbuf_size << 1); 428 429 tty_attach(tp); 430 } 431 432 /* 433 * Start or restart transmission. 434 */ 435 static void 436 scistart(struct tty *tp) 437 { 438 struct sci_softc *sc = device_lookup_private(&sci_cd,SCIUNIT(tp->t_dev)); 439 int s; 440 441 s = spltty(); 442 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 443 goto out; 444 if (sc->sc_tx_stopped) 445 goto out; 446 if (!ttypull(tp)) 447 goto out; 448 449 /* Grab the first contiguous region of buffer space. */ 450 { 451 u_char *tba; 452 int tbc; 453 454 tba = tp->t_outq.c_cf; 455 tbc = ndqb(&tp->t_outq, 0); 456 457 (void)splserial(); 458 459 sc->sc_tba = tba; 460 sc->sc_tbc = tbc; 461 } 462 463 SET(tp->t_state, TS_BUSY); 464 sc->sc_tx_busy = 1; 465 466 /* Enable transmit completion interrupts if necessary. */ 467 SHREG_SCSCR |= SCSCR_TIE | SCSCR_RIE; 468 469 /* Output the first byte of the contiguous buffer. */ 470 { 471 if (sc->sc_tbc > 0) { 472 sci_putc(*(sc->sc_tba)); 473 sc->sc_tba++; 474 sc->sc_tbc--; 475 } 476 } 477 out: 478 splx(s); 479 return; 480 } 481 482 /* 483 * Set SCI tty parameters from termios. 484 * XXX - Should just copy the whole termios after 485 * making sure all the changes could be done. 486 */ 487 static int 488 sciparam(struct tty *tp, struct termios *t) 489 { 490 struct sci_softc *sc = device_lookup_private(&sci_cd, SCIUNIT(tp->t_dev)); 491 int ospeed = t->c_ospeed; 492 int s; 493 494 if (!device_is_active(sc->sc_dev)) 495 return (EIO); 496 497 /* Check requested parameters. */ 498 if (ospeed < 0) 499 return (EINVAL); 500 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 501 return (EINVAL); 502 503 /* 504 * For the console, always force CLOCAL and !HUPCL, so that the port 505 * is always active. 506 */ 507 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) || 508 ISSET(sc->sc_hwflags, SCI_HW_CONSOLE)) { 509 SET(t->c_cflag, CLOCAL); 510 CLR(t->c_cflag, HUPCL); 511 } 512 513 /* 514 * If there were no changes, don't do anything. This avoids dropping 515 * input and improves performance when all we did was frob things like 516 * VMIN and VTIME. 517 */ 518 if (tp->t_ospeed == t->c_ospeed && 519 tp->t_cflag == t->c_cflag) 520 return (0); 521 522 #if 0 523 /* XXX (msaitoh) */ 524 lcr = ISSET(sc->sc_lcr, LCR_SBREAK) | cflag2lcr(t->c_cflag); 525 #endif 526 527 s = splserial(); 528 529 /* 530 * Set the FIFO threshold based on the receive speed. 531 * 532 * * If it's a low speed, it's probably a mouse or some other 533 * interactive device, so set the threshold low. 534 * * If it's a high speed, trim the trigger level down to prevent 535 * overflows. 536 * * Otherwise set it a bit higher. 537 */ 538 #if 0 539 /* XXX (msaitoh) */ 540 if (ISSET(sc->sc_hwflags, SCI_HW_HAYESP)) 541 sc->sc_fifo = FIFO_DMA_MODE | FIFO_ENABLE | FIFO_TRIGGER_8; 542 else if (ISSET(sc->sc_hwflags, SCI_HW_FIFO)) 543 sc->sc_fifo = FIFO_ENABLE | 544 (t->c_ospeed <= 1200 ? FIFO_TRIGGER_1 : 545 t->c_ospeed <= 38400 ? FIFO_TRIGGER_8 : FIFO_TRIGGER_4); 546 else 547 sc->sc_fifo = 0; 548 #endif 549 550 /* And copy to tty. */ 551 tp->t_ispeed = 0; 552 tp->t_ospeed = t->c_ospeed; 553 tp->t_cflag = t->c_cflag; 554 555 if (!sc->sc_heldchange) { 556 if (sc->sc_tx_busy) { 557 sc->sc_heldtbc = sc->sc_tbc; 558 sc->sc_tbc = 0; 559 sc->sc_heldchange = 1; 560 } 561 #if 0 562 /* XXX (msaitoh) */ 563 else 564 sci_loadchannelregs(sc); 565 #endif 566 } 567 568 if (!ISSET(t->c_cflag, CHWFLOW)) { 569 /* Disable the high water mark. */ 570 sc->sc_r_hiwat = 0; 571 sc->sc_r_lowat = 0; 572 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 573 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 574 sci_schedrx(sc); 575 } 576 } else { 577 sc->sc_r_hiwat = sci_rbuf_hiwat; 578 sc->sc_r_lowat = sci_rbuf_lowat; 579 } 580 581 splx(s); 582 583 DPRINTF(("%s: sciparam\n", device_xname(sc->sc_dev))); 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; 599 600 if (((err_c = SHREG_SCSSR) 601 & (SCSSR_RDRF | SCSSR_ORER | SCSSR_FER | SCSSR_PER)) != 0) { 602 603 if ((err_c & (SCSSR_ORER | SCSSR_FER | SCSSR_PER)) != 0) { 604 SHREG_SCSSR &= ~(SCSSR_ORER | SCSSR_FER | SCSSR_PER); 605 return; 606 } 607 608 (void)SHREG_SCRDR; 609 610 SHREG_SCSSR &= ~SCSSR_RDRF; 611 } 612 } 613 614 int 615 sciopen(dev_t dev, int flag, int mode, struct lwp *l) 616 { 617 struct sci_softc *sc; 618 struct tty *tp; 619 int s, s2; 620 int error; 621 622 sc = device_lookup_private(&sci_cd, SCIUNIT(dev)); 623 if (sc == 0 || !ISSET(sc->sc_hwflags, SCI_HW_DEV_OK) || 624 sc->sc_rbuf == NULL) 625 return (ENXIO); 626 627 if (!device_is_active(sc->sc_dev)) 628 return (ENXIO); 629 630 #ifdef KGDB 631 /* 632 * If this is the kgdb port, no other use is permitted. 633 */ 634 if (ISSET(sc->sc_hwflags, SCI_HW_KGDB)) 635 return (EBUSY); 636 #endif 637 638 tp = sc->sc_tty; 639 640 if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp)) 641 return (EBUSY); 642 643 s = spltty(); 644 645 /* 646 * Do the following iff this is a first open. 647 */ 648 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 649 struct termios t; 650 651 tp->t_dev = dev; 652 653 s2 = splserial(); 654 655 /* Turn on interrupts. */ 656 SHREG_SCSCR |= SCSCR_TIE | SCSCR_RIE; 657 658 splx(s2); 659 660 /* 661 * Initialize the termios status to the defaults. Add in the 662 * sticky bits from TIOCSFLAGS. 663 */ 664 t.c_ispeed = 0; 665 if (ISSET(sc->sc_hwflags, SCI_HW_CONSOLE)) { 666 t.c_ospeed = scicn_speed; 667 t.c_cflag = sciconscflag; 668 } else { 669 t.c_ospeed = TTYDEF_SPEED; 670 t.c_cflag = TTYDEF_CFLAG; 671 } 672 if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL)) 673 SET(t.c_cflag, CLOCAL); 674 if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)) 675 SET(t.c_cflag, CRTSCTS); 676 if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF)) 677 SET(t.c_cflag, MDMBUF); 678 /* Make sure sciparam() will do something. */ 679 tp->t_ospeed = 0; 680 (void) sciparam(tp, &t); 681 tp->t_iflag = TTYDEF_IFLAG; 682 tp->t_oflag = TTYDEF_OFLAG; 683 tp->t_lflag = TTYDEF_LFLAG; 684 ttychars(tp); 685 ttsetwater(tp); 686 687 s2 = splserial(); 688 689 /* Clear the input ring, and unblock. */ 690 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 691 sc->sc_rbavail = sci_rbuf_size; 692 sci_iflush(sc); 693 CLR(sc->sc_rx_flags, RX_ANY_BLOCK); 694 #if 0 695 /* XXX (msaitoh) */ 696 sci_hwiflow(sc); 697 #endif 698 699 DPRINTF(("%s: sciopen\n", device_xname(sc->sc_dev))); 700 701 splx(s2); 702 } 703 704 splx(s); 705 706 error = ttyopen(tp, SCIDIALOUT(dev), ISSET(flag, O_NONBLOCK)); 707 if (error) 708 goto bad; 709 710 error = (*tp->t_linesw->l_open)(dev, tp); 711 if (error) 712 goto bad; 713 714 return (0); 715 716 bad: 717 718 return (error); 719 } 720 721 int 722 sciclose(dev_t dev, int flag, int mode, struct lwp *l) 723 { 724 struct sci_softc *sc = device_lookup_private(&sci_cd, SCIUNIT(dev)); 725 struct tty *tp = sc->sc_tty; 726 727 /* XXX This is for cons.c. */ 728 if (!ISSET(tp->t_state, TS_ISOPEN)) 729 return (0); 730 731 (*tp->t_linesw->l_close)(tp, flag); 732 ttyclose(tp); 733 734 if (!device_is_active(sc->sc_dev)) 735 return (0); 736 737 return (0); 738 } 739 740 int 741 sciread(dev_t dev, struct uio *uio, int flag) 742 { 743 struct sci_softc *sc = device_lookup_private(&sci_cd, SCIUNIT(dev)); 744 struct tty *tp = sc->sc_tty; 745 746 return ((*tp->t_linesw->l_read)(tp, uio, flag)); 747 } 748 749 int 750 sciwrite(dev_t dev, struct uio *uio, int flag) 751 { 752 struct sci_softc *sc = device_lookup_private(&sci_cd, SCIUNIT(dev)); 753 struct tty *tp = sc->sc_tty; 754 755 return ((*tp->t_linesw->l_write)(tp, uio, flag)); 756 } 757 758 int 759 scipoll(dev_t dev, int events, struct lwp *l) 760 { 761 struct sci_softc *sc = device_lookup_private(&sci_cd, SCIUNIT(dev)); 762 struct tty *tp = sc->sc_tty; 763 764 return ((*tp->t_linesw->l_poll)(tp, events, l)); 765 } 766 767 struct tty * 768 scitty(dev_t dev) 769 { 770 struct sci_softc *sc = device_lookup_private(&sci_cd, SCIUNIT(dev)); 771 struct tty *tp = sc->sc_tty; 772 773 return (tp); 774 } 775 776 int 777 sciioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 778 { 779 struct sci_softc *sc = device_lookup_private(&sci_cd, SCIUNIT(dev)); 780 struct tty *tp = sc->sc_tty; 781 int error; 782 int s; 783 784 if (!device_is_active(sc->sc_dev)) 785 return (EIO); 786 787 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 788 if (error != EPASSTHROUGH) 789 return (error); 790 791 error = ttioctl(tp, cmd, data, flag, l); 792 if (error != EPASSTHROUGH) 793 return (error); 794 795 error = 0; 796 797 s = splserial(); 798 799 switch (cmd) { 800 case TIOCSBRK: 801 sci_break(sc, 1); 802 break; 803 804 case TIOCCBRK: 805 sci_break(sc, 0); 806 break; 807 808 case TIOCGFLAGS: 809 *(int *)data = sc->sc_swflags; 810 break; 811 812 case TIOCSFLAGS: 813 error = kauth_authorize_device_tty(l->l_cred, 814 KAUTH_DEVICE_TTY_PRIVSET, tp); 815 if (error) 816 break; 817 sc->sc_swflags = *(int *)data; 818 break; 819 820 default: 821 error = EPASSTHROUGH; 822 break; 823 } 824 825 splx(s); 826 827 return (error); 828 } 829 830 integrate void 831 sci_schedrx(struct sci_softc *sc) 832 { 833 834 sc->sc_rx_ready = 1; 835 836 /* Wake up the poller. */ 837 softint_schedule(sc->sc_si); 838 } 839 840 void 841 sci_break(struct sci_softc *sc, int onoff) 842 { 843 844 if (onoff) 845 SHREG_SCSSR &= ~SCSSR_TDRE; 846 else 847 SHREG_SCSSR |= SCSSR_TDRE; 848 849 #if 0 /* XXX */ 850 if (!sc->sc_heldchange) { 851 if (sc->sc_tx_busy) { 852 sc->sc_heldtbc = sc->sc_tbc; 853 sc->sc_tbc = 0; 854 sc->sc_heldchange = 1; 855 } else 856 sci_loadchannelregs(sc); 857 } 858 #endif 859 } 860 861 /* 862 * Stop output, e.g., for ^S or output flush. 863 */ 864 void 865 scistop(struct tty *tp, int flag) 866 { 867 struct sci_softc *sc = device_lookup_private(&sci_cd, SCIUNIT(tp->t_dev)); 868 int s; 869 870 s = splserial(); 871 if (ISSET(tp->t_state, TS_BUSY)) { 872 /* Stop transmitting at the next chunk. */ 873 sc->sc_tbc = 0; 874 sc->sc_heldtbc = 0; 875 if (!ISSET(tp->t_state, TS_TTSTOP)) 876 SET(tp->t_state, TS_FLUSH); 877 } 878 splx(s); 879 } 880 881 void 882 scidiag(void *arg) 883 { 884 struct sci_softc *sc = arg; 885 int overflows, floods; 886 int s; 887 888 s = splserial(); 889 overflows = sc->sc_overflows; 890 sc->sc_overflows = 0; 891 floods = sc->sc_floods; 892 sc->sc_floods = 0; 893 sc->sc_errors = 0; 894 splx(s); 895 896 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 897 device_xname(sc->sc_dev), 898 overflows, overflows == 1 ? "" : "s", 899 floods, floods == 1 ? "" : "s"); 900 } 901 902 integrate void 903 sci_rxsoft(struct sci_softc *sc, struct tty *tp) 904 { 905 int (*rint)(int, struct tty *) = tp->t_linesw->l_rint; 906 u_char *get, *end; 907 u_int cc, scc; 908 u_char ssr; 909 int code; 910 int s; 911 912 end = sc->sc_ebuf; 913 get = sc->sc_rbget; 914 scc = cc = sci_rbuf_size - sc->sc_rbavail; 915 916 if (cc == sci_rbuf_size) { 917 sc->sc_floods++; 918 if (sc->sc_errors++ == 0) 919 callout_reset(&sc->sc_diag_ch, 60 * hz, scidiag, sc); 920 } 921 922 while (cc) { 923 code = get[0]; 924 ssr = get[1]; 925 if (ISSET(ssr, SCSSR_FER | SCSSR_PER)) { 926 if (ISSET(ssr, SCSSR_FER)) 927 SET(code, TTY_FE); 928 if (ISSET(ssr, SCSSR_PER)) 929 SET(code, TTY_PE); 930 } 931 if ((*rint)(code, tp) == -1) { 932 /* 933 * The line discipline's buffer is out of space. 934 */ 935 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 936 /* 937 * We're either not using flow control, or the 938 * line discipline didn't tell us to block for 939 * some reason. Either way, we have no way to 940 * know when there's more space available, so 941 * just drop the rest of the data. 942 */ 943 get += cc << 1; 944 if (get >= end) 945 get -= sci_rbuf_size << 1; 946 cc = 0; 947 } else { 948 /* 949 * Don't schedule any more receive processing 950 * until the line discipline tells us there's 951 * space available (through scihwiflow()). 952 * Leave the rest of the data in the input 953 * buffer. 954 */ 955 SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 956 } 957 break; 958 } 959 get += 2; 960 if (get >= end) 961 get = sc->sc_rbuf; 962 cc--; 963 } 964 965 if (cc != scc) { 966 sc->sc_rbget = get; 967 s = splserial(); 968 cc = sc->sc_rbavail += scc - cc; 969 /* Buffers should be ok again, release possible block. */ 970 if (cc >= sc->sc_r_lowat) { 971 if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 972 CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 973 SHREG_SCSCR |= SCSCR_RIE; 974 } 975 #if 0 976 if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) { 977 CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED); 978 sci_hwiflow(sc); 979 } 980 #endif 981 } 982 splx(s); 983 } 984 } 985 986 integrate void 987 sci_txsoft(struct sci_softc *sc, struct tty *tp) 988 { 989 990 CLR(tp->t_state, TS_BUSY); 991 if (ISSET(tp->t_state, TS_FLUSH)) 992 CLR(tp->t_state, TS_FLUSH); 993 else 994 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf)); 995 (*tp->t_linesw->l_start)(tp); 996 } 997 998 integrate void 999 sci_stsoft(struct sci_softc *sc, struct tty *tp) 1000 { 1001 #if 0 1002 /* XXX (msaitoh) */ 1003 u_char msr, delta; 1004 int s; 1005 1006 s = splserial(); 1007 msr = sc->sc_msr; 1008 delta = sc->sc_msr_delta; 1009 sc->sc_msr_delta = 0; 1010 splx(s); 1011 1012 if (ISSET(delta, sc->sc_msr_dcd)) { 1013 /* 1014 * Inform the tty layer that carrier detect changed. 1015 */ 1016 (void) (*tp->t_linesw->l_modem)(tp, ISSET(msr, MSR_DCD)); 1017 } 1018 1019 if (ISSET(delta, sc->sc_msr_cts)) { 1020 /* Block or unblock output according to flow control. */ 1021 if (ISSET(msr, sc->sc_msr_cts)) { 1022 sc->sc_tx_stopped = 0; 1023 (*tp->t_linesw->l_start)(tp); 1024 } else { 1025 sc->sc_tx_stopped = 1; 1026 } 1027 } 1028 1029 DPRINTF(("%s: sci_stsoft\n", device_xname(sc->sc_dev))); 1030 #endif 1031 } 1032 1033 void 1034 scisoft(void *arg) 1035 { 1036 struct sci_softc *sc = arg; 1037 struct tty *tp; 1038 1039 if (!device_is_active(sc->sc_dev)) 1040 return; 1041 1042 tp = sc->sc_tty; 1043 1044 if (sc->sc_rx_ready) { 1045 sc->sc_rx_ready = 0; 1046 sci_rxsoft(sc, tp); 1047 } 1048 1049 #if 0 1050 if (sc->sc_st_check) { 1051 sc->sc_st_check = 0; 1052 sci_stsoft(sc, tp); 1053 } 1054 #endif 1055 1056 if (sc->sc_tx_done) { 1057 sc->sc_tx_done = 0; 1058 sci_txsoft(sc, tp); 1059 } 1060 } 1061 1062 int 1063 sciintr(void *arg) 1064 { 1065 struct sci_softc *sc = arg; 1066 u_char *put, *end; 1067 u_int cc; 1068 u_short ssr; 1069 1070 if (!device_is_active(sc->sc_dev)) 1071 return (0); 1072 1073 end = sc->sc_ebuf; 1074 put = sc->sc_rbput; 1075 cc = sc->sc_rbavail; 1076 1077 do { 1078 ssr = SHREG_SCSSR; 1079 if (ISSET(ssr, SCSSR_FER)) { 1080 SHREG_SCSSR &= ~(SCSSR_ORER | SCSSR_PER | SCSSR_FER); 1081 #if defined(DDB) || defined(KGDB) 1082 #ifdef SH4 1083 if ((SHREG_SCSPTR & SCSPTR_SPB0DT) != 0) { 1084 #else 1085 if ((SHREG_SCSPDR & SCSPDR_SCP0DT) != 0) { 1086 #endif 1087 #ifdef DDB 1088 if (ISSET(sc->sc_hwflags, SCI_HW_CONSOLE)) { 1089 console_debugger(); 1090 } 1091 #endif 1092 #ifdef KGDB 1093 if (ISSET(sc->sc_hwflags, SCI_HW_KGDB)) { 1094 kgdb_connect(1); 1095 } 1096 #endif 1097 } 1098 #endif /* DDB || KGDB */ 1099 } 1100 if ((SHREG_SCSSR & SCSSR_RDRF) != 0) { 1101 if (cc > 0) { 1102 put[0] = SHREG_SCRDR; 1103 put[1] = SHREG_SCSSR & 0x00ff; 1104 1105 put += 2; 1106 if (put >= end) 1107 put = sc->sc_rbuf; 1108 cc--; 1109 } 1110 1111 SHREG_SCSSR &= ~(SCSSR_ORER | SCSSR_FER | SCSSR_PER | 1112 SCSSR_RDRF); 1113 1114 /* 1115 * Current string of incoming characters ended because 1116 * no more data was available or we ran out of space. 1117 * Schedule a receive event if any data was received. 1118 * If we're out of space, turn off receive interrupts. 1119 */ 1120 sc->sc_rbput = put; 1121 sc->sc_rbavail = cc; 1122 if (!ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) 1123 sc->sc_rx_ready = 1; 1124 1125 /* 1126 * See if we are in danger of overflowing a buffer. If 1127 * so, use hardware flow control to ease the pressure. 1128 */ 1129 if (!ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED) && 1130 cc < sc->sc_r_hiwat) { 1131 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1132 #if 0 1133 sci_hwiflow(sc); 1134 #endif 1135 } 1136 1137 /* 1138 * If we're out of space, disable receive interrupts 1139 * until the queue has drained a bit. 1140 */ 1141 if (!cc) { 1142 SET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1143 SHREG_SCSCR &= ~SCSCR_RIE; 1144 } 1145 } else { 1146 if (SHREG_SCSSR & SCSSR_RDRF) { 1147 SHREG_SCSCR &= ~(SCSCR_TIE | SCSCR_RIE); 1148 delay(10); 1149 SHREG_SCSCR |= SCSCR_TIE | SCSCR_RIE; 1150 continue; 1151 } 1152 } 1153 } while (SHREG_SCSSR & SCSSR_RDRF); 1154 1155 #if 0 1156 msr = bus_space_read_1(iot, ioh, sci_msr); 1157 delta = msr ^ sc->sc_msr; 1158 sc->sc_msr = msr; 1159 if (ISSET(delta, sc->sc_msr_mask)) { 1160 SET(sc->sc_msr_delta, delta); 1161 1162 /* 1163 * Pulse-per-second clock signal on edge of DCD? 1164 */ 1165 if (ISSET(delta, sc->sc_ppsmask)) { 1166 struct timeval tv; 1167 if (ISSET(msr, sc->sc_ppsmask) == 1168 sc->sc_ppsassert) { 1169 /* XXX nanotime() */ 1170 microtime(&tv); 1171 TIMEVAL_TO_TIMESPEC(&tv, 1172 &sc->ppsinfo.assert_timestamp); 1173 if (sc->ppsparam.mode & PPS_OFFSETASSERT) { 1174 timespecadd(&sc->ppsinfo.assert_timestamp, 1175 &sc->ppsparam.assert_offset, 1176 &sc->ppsinfo.assert_timestamp); 1177 TIMESPEC_TO_TIMEVAL(&tv, &sc->ppsinfo.assert_timestamp); 1178 } 1179 1180 #ifdef PPS_SYNC 1181 if (sc->ppsparam.mode & PPS_HARDPPSONASSERT) 1182 hardpps(&tv, tv.tv_usec); 1183 #endif 1184 sc->ppsinfo.assert_sequence++; 1185 sc->ppsinfo.current_mode = 1186 sc->ppsparam.mode; 1187 1188 } else if (ISSET(msr, sc->sc_ppsmask) == 1189 sc->sc_ppsclear) { 1190 /* XXX nanotime() */ 1191 microtime(&tv); 1192 TIMEVAL_TO_TIMESPEC(&tv, 1193 &sc->ppsinfo.clear_timestamp); 1194 if (sc->ppsparam.mode & PPS_OFFSETCLEAR) { 1195 timespecadd(&sc->ppsinfo.clear_timestamp, 1196 &sc->ppsparam.clear_offset, 1197 &sc->ppsinfo.clear_timestamp); 1198 TIMESPEC_TO_TIMEVAL(&tv, &sc->ppsinfo.clear_timestamp); 1199 } 1200 1201 #ifdef PPS_SYNC 1202 if (sc->ppsparam.mode & PPS_HARDPPSONCLEAR) 1203 hardpps(&tv, tv.tv_usec); 1204 #endif 1205 sc->ppsinfo.clear_sequence++; 1206 sc->ppsinfo.current_mode = 1207 sc->ppsparam.mode; 1208 } 1209 } 1210 1211 /* 1212 * Stop output immediately if we lose the output 1213 * flow control signal or carrier detect. 1214 */ 1215 if (ISSET(~msr, sc->sc_msr_mask)) { 1216 sc->sc_tbc = 0; 1217 sc->sc_heldtbc = 0; 1218 1219 DPRINTF(("%s: sciintr\n", device_xname(sc->sc_dev))); 1220 } 1221 1222 sc->sc_st_check = 1; 1223 } 1224 #endif 1225 1226 /* 1227 * Done handling any receive interrupts. See if data can be 1228 * transmitted as well. Schedule tx done event if no data left 1229 * and tty was marked busy. 1230 */ 1231 if ((SHREG_SCSSR & SCSSR_TDRE) != 0) { 1232 /* 1233 * If we've delayed a parameter change, do it now, and restart 1234 * output. 1235 */ 1236 if (sc->sc_heldchange) { 1237 sc->sc_heldchange = 0; 1238 sc->sc_tbc = sc->sc_heldtbc; 1239 sc->sc_heldtbc = 0; 1240 } 1241 1242 /* Output the next chunk of the contiguous buffer, if any. */ 1243 if (sc->sc_tbc > 0) { 1244 sci_putc(*(sc->sc_tba)); 1245 sc->sc_tba++; 1246 sc->sc_tbc--; 1247 } else { 1248 /* Disable transmit completion interrupts if necessary. */ 1249 #if 0 1250 if (ISSET(sc->sc_ier, IER_ETXRDY)) 1251 #endif 1252 SHREG_SCSCR &= ~SCSCR_TIE; 1253 1254 if (sc->sc_tx_busy) { 1255 sc->sc_tx_busy = 0; 1256 sc->sc_tx_done = 1; 1257 } 1258 } 1259 } 1260 1261 /* Wake up the poller. */ 1262 softint_schedule(sc->sc_si); 1263 1264 #ifdef RND_SCI 1265 rnd_add_uint32(&sc->rnd_source, iir | lsr); 1266 #endif 1267 1268 return (1); 1269 } 1270 1271 void 1272 scicnprobe(struct consdev *cp) 1273 { 1274 int maj; 1275 1276 /* locate the major number */ 1277 maj = cdevsw_lookup_major(&sci_cdevsw); 1278 1279 /* Initialize required fields. */ 1280 cp->cn_dev = makedev(maj, 0); 1281 #ifdef SCICONSOLE 1282 cp->cn_pri = CN_REMOTE; 1283 #else 1284 cp->cn_pri = CN_NORMAL; 1285 #endif 1286 } 1287 1288 void 1289 scicninit(struct consdev *cp) 1290 { 1291 1292 InitializeSci(scicn_speed); 1293 sciisconsole = 1; 1294 } 1295 1296 int 1297 scicngetc(dev_t dev) 1298 { 1299 int c; 1300 int s; 1301 1302 s = splserial(); 1303 c = sci_getc(); 1304 splx(s); 1305 1306 return (c); 1307 } 1308 1309 void 1310 scicnputc(dev_t dev, int c) 1311 { 1312 int s; 1313 1314 s = splserial(); 1315 sci_putc((u_char)c); 1316 splx(s); 1317 } 1318
Indexes created Sat Sep 20 22:09:52 GMT 2025