sio.c revision 51078
1/*- 2 * Copyright (c) 1991 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * $FreeBSD: head/sys/dev/sio/sio.c 51078 1999-09-08 10:59:03Z peter $ 34 * from: @(#)com.c 7.5 (Berkeley) 5/16/91 35 * from: i386/isa sio.c,v 1.234 36 */ 37 38#include "opt_comconsole.h" 39#include "opt_compat.h" 40#include "opt_ddb.h" 41#include "opt_sio.h" 42#include "sio.h" 43 44/* 45 * Serial driver, based on 386BSD-0.1 com driver. 46 * Mostly rewritten to use pseudo-DMA. 47 * Works for National Semiconductor NS8250-NS16550AF UARTs. 48 * COM driver, based on HP dca driver. 49 * 50 * Changes for PC-Card integration: 51 * - Added PC-Card driver table and handlers 52 */ 53#include <sys/param.h> 54#include <sys/systm.h> 55#include <sys/reboot.h> 56#include <sys/malloc.h> 57#include <sys/tty.h> 58#include <sys/proc.h> 59#include <sys/module.h> 60#include <sys/conf.h> 61#include <sys/dkstat.h> 62#include <sys/fcntl.h> 63#include <sys/interrupt.h> 64#include <sys/kernel.h> 65#include <sys/syslog.h> 66#include <sys/sysctl.h> 67#include <sys/bus.h> 68#include <machine/bus.h> 69#include <sys/rman.h> 70#include <sys/timepps.h> 71 72#include <isa/isareg.h> 73#include <isa/isavar.h> 74#include <machine/lock.h> 75 76#include <machine/clock.h> 77#include <machine/ipl.h> 78#ifndef SMP 79#include <machine/lock.h> 80#endif 81#include <machine/resource.h> 82 83#include <isa/sioreg.h> 84 85#ifdef COM_ESP 86#include <isa/ic/esp.h> 87#endif 88#include <isa/ic/ns16550.h> 89 90#if 0 91#include "card.h" 92#if NCARD > 0 93#include <sys/module.h> 94#include <pccard/cardinfo.h> 95#include <pccard/slot.h> 96#endif 97#else 98#define NCARD 0 99#endif 100 101#ifndef __i386__ 102#define disable_intr() 103#define enable_intr() 104#endif 105 106#ifdef SMP 107#define disable_intr() COM_DISABLE_INTR() 108#define enable_intr() COM_ENABLE_INTR() 109#endif /* SMP */ 110 111#ifndef EXTRA_SIO 112#define EXTRA_SIO 4 /* XXX shouldn't need NSIO */ 113#endif 114 115#define NSIOTOT (NSIO + EXTRA_SIO) 116 117#define LOTS_OF_EVENTS 64 /* helps separate urgent events from input */ 118 119#define CALLOUT_MASK 0x80 120#define CONTROL_MASK 0x60 121#define CONTROL_INIT_STATE 0x20 122#define CONTROL_LOCK_STATE 0x40 123#define DEV_TO_UNIT(dev) (MINOR_TO_UNIT(minor(dev))) 124#define MINOR_MAGIC_MASK (CALLOUT_MASK | CONTROL_MASK) 125#define MINOR_TO_UNIT(mynor) ((mynor) & ~MINOR_MAGIC_MASK) 126 127#ifdef COM_MULTIPORT 128/* checks in flags for multiport and which is multiport "master chip" 129 * for a given card 130 */ 131#define COM_ISMULTIPORT(flags) ((flags) & 0x01) 132#define COM_MPMASTER(flags) (((flags) >> 8) & 0x0ff) 133#define COM_NOTAST4(flags) ((flags) & 0x04) 134#endif /* COM_MULTIPORT */ 135 136#define COM_CONSOLE(flags) ((flags) & 0x10) 137#define COM_FORCECONSOLE(flags) ((flags) & 0x20) 138#define COM_LLCONSOLE(flags) ((flags) & 0x40) 139#define COM_DEBUGGER(flags) ((flags) & 0x80) 140#define COM_LOSESOUTINTS(flags) ((flags) & 0x08) 141#define COM_NOFIFO(flags) ((flags) & 0x02) 142#define COM_ST16650A(flags) ((flags) & 0x20000) 143#define COM_C_NOPROBE (0x40000) 144#define COM_NOPROBE(flags) ((flags) & COM_C_NOPROBE) 145#define COM_C_IIR_TXRDYBUG (0x80000) 146#define COM_IIR_TXRDYBUG(flags) ((flags) & COM_C_IIR_TXRDYBUG) 147#define COM_FIFOSIZE(flags) (((flags) & 0xff000000) >> 24) 148 149#define com_scr 7 /* scratch register for 16450-16550 (R/W) */ 150 151/* 152 * com state bits. 153 * (CS_BUSY | CS_TTGO) and (CS_BUSY | CS_TTGO | CS_ODEVREADY) must be higher 154 * than the other bits so that they can be tested as a group without masking 155 * off the low bits. 156 * 157 * The following com and tty flags correspond closely: 158 * CS_BUSY = TS_BUSY (maintained by comstart(), siopoll() and 159 * siostop()) 160 * CS_TTGO = ~TS_TTSTOP (maintained by comparam() and comstart()) 161 * CS_CTS_OFLOW = CCTS_OFLOW (maintained by comparam()) 162 * CS_RTS_IFLOW = CRTS_IFLOW (maintained by comparam()) 163 * TS_FLUSH is not used. 164 * XXX I think TIOCSETA doesn't clear TS_TTSTOP when it clears IXON. 165 * XXX CS_*FLOW should be CF_*FLOW in com->flags (control flags not state). 166 */ 167#define CS_BUSY 0x80 /* output in progress */ 168#define CS_TTGO 0x40 /* output not stopped by XOFF */ 169#define CS_ODEVREADY 0x20 /* external device h/w ready (CTS) */ 170#define CS_CHECKMSR 1 /* check of MSR scheduled */ 171#define CS_CTS_OFLOW 2 /* use CTS output flow control */ 172#define CS_DTR_OFF 0x10 /* DTR held off */ 173#define CS_ODONE 4 /* output completed */ 174#define CS_RTS_IFLOW 8 /* use RTS input flow control */ 175#define CSE_BUSYCHECK 1 /* siobusycheck() scheduled */ 176 177static char const * const error_desc[] = { 178#define CE_OVERRUN 0 179 "silo overflow", 180#define CE_INTERRUPT_BUF_OVERFLOW 1 181 "interrupt-level buffer overflow", 182#define CE_TTY_BUF_OVERFLOW 2 183 "tty-level buffer overflow", 184}; 185 186#define CE_NTYPES 3 187#define CE_RECORD(com, errnum) (++(com)->delta_error_counts[errnum]) 188 189/* types. XXX - should be elsewhere */ 190typedef u_int Port_t; /* hardware port */ 191typedef u_char bool_t; /* boolean */ 192 193/* queue of linear buffers */ 194struct lbq { 195 u_char *l_head; /* next char to process */ 196 u_char *l_tail; /* one past the last char to process */ 197 struct lbq *l_next; /* next in queue */ 198 bool_t l_queued; /* nonzero if queued */ 199}; 200 201/* com device structure */ 202struct com_s { 203 u_int flags; /* Copy isa device flags */ 204 u_char state; /* miscellaneous flag bits */ 205 bool_t active_out; /* nonzero if the callout device is open */ 206 u_char cfcr_image; /* copy of value written to CFCR */ 207#ifdef COM_ESP 208 bool_t esp; /* is this unit a hayes esp board? */ 209#endif 210 u_char extra_state; /* more flag bits, separate for order trick */ 211 u_char fifo_image; /* copy of value written to FIFO */ 212 bool_t hasfifo; /* nonzero for 16550 UARTs */ 213 bool_t st16650a; /* Is a Startech 16650A or RTS/CTS compat */ 214 bool_t loses_outints; /* nonzero if device loses output interrupts */ 215 u_char mcr_image; /* copy of value written to MCR */ 216#ifdef COM_MULTIPORT 217 bool_t multiport; /* is this unit part of a multiport device? */ 218#endif /* COM_MULTIPORT */ 219 bool_t no_irq; /* nonzero if irq is not attached */ 220 bool_t gone; /* hardware disappeared */ 221 bool_t poll; /* nonzero if polling is required */ 222 bool_t poll_output; /* nonzero if polling for output is required */ 223 int unit; /* unit number */ 224 int dtr_wait; /* time to hold DTR down on close (* 1/hz) */ 225 u_int tx_fifo_size; 226 u_int wopeners; /* # processes waiting for DCD in open() */ 227 228 /* 229 * The high level of the driver never reads status registers directly 230 * because there would be too many side effects to handle conveniently. 231 * Instead, it reads copies of the registers stored here by the 232 * interrupt handler. 233 */ 234 u_char last_modem_status; /* last MSR read by intr handler */ 235 u_char prev_modem_status; /* last MSR handled by high level */ 236 237 u_char hotchar; /* ldisc-specific char to be handled ASAP */ 238 u_char *ibuf; /* start of input buffer */ 239 u_char *ibufend; /* end of input buffer */ 240 u_char *ibufold; /* old input buffer, to be freed */ 241 u_char *ihighwater; /* threshold in input buffer */ 242 u_char *iptr; /* next free spot in input buffer */ 243 int ibufsize; /* size of ibuf (not include error bytes) */ 244 int ierroff; /* offset of error bytes in ibuf */ 245 246 struct lbq obufq; /* head of queue of output buffers */ 247 struct lbq obufs[2]; /* output buffers */ 248 249 Port_t data_port; /* i/o ports */ 250#ifdef COM_ESP 251 Port_t esp_port; 252#endif 253 Port_t int_id_port; 254 Port_t iobase; 255 Port_t modem_ctl_port; 256 Port_t line_status_port; 257 Port_t modem_status_port; 258 Port_t intr_ctl_port; /* Ports of IIR register */ 259 260 struct tty *tp; /* cross reference */ 261 262 /* Initial state. */ 263 struct termios it_in; /* should be in struct tty */ 264 struct termios it_out; 265 266 /* Lock state. */ 267 struct termios lt_in; /* should be in struct tty */ 268 struct termios lt_out; 269 270 bool_t do_timestamp; 271 bool_t do_dcd_timestamp; 272 struct timeval timestamp; 273 struct timeval dcd_timestamp; 274 struct pps_state pps; 275 276 u_long bytes_in; /* statistics */ 277 u_long bytes_out; 278 u_int delta_error_counts[CE_NTYPES]; 279 u_long error_counts[CE_NTYPES]; 280 281 struct resource *irqres; 282 struct resource *ioportres; 283 284 /* 285 * Data area for output buffers. Someday we should build the output 286 * buffer queue without copying data. 287 */ 288 u_char obuf1[256]; 289 u_char obuf2[256]; 290}; 291 292#ifdef COM_ESP 293static int espattach __P((struct com_s *com, Port_t esp_port)); 294#endif 295static int sioattach __P((device_t dev)); 296 297static timeout_t siobusycheck; 298static timeout_t siodtrwakeup; 299static void comhardclose __P((struct com_s *com)); 300static void sioinput __P((struct com_s *com)); 301static void siointr1 __P((struct com_s *com)); 302static void siointr __P((void *arg)); 303static int commctl __P((struct com_s *com, int bits, int how)); 304static int comparam __P((struct tty *tp, struct termios *t)); 305static swihand_t siopoll; 306static int sioprobe __P((device_t dev)); 307static void siosettimeout __P((void)); 308static int siosetwater __P((struct com_s *com, speed_t speed)); 309static void comstart __P((struct tty *tp)); 310static timeout_t comwakeup; 311static void disc_optim __P((struct tty *tp, struct termios *t, 312 struct com_s *com)); 313 314 315static char driver_name[] = "sio"; 316 317/* table and macro for fast conversion from a unit number to its com struct */ 318static devclass_t sio_devclass; 319#define com_addr(unit) ((struct com_s *) \ 320 devclass_get_softc(sio_devclass, unit)) 321 322static device_method_t sio_methods[] = { 323 /* Device interface */ 324 DEVMETHOD(device_probe, sioprobe), 325 DEVMETHOD(device_attach, sioattach), 326 327 { 0, 0 } 328}; 329 330static driver_t sio_driver = { 331 driver_name, 332 sio_methods, 333 sizeof(struct com_s), 334}; 335 336static d_open_t sioopen; 337static d_close_t sioclose; 338static d_read_t sioread; 339static d_write_t siowrite; 340static d_ioctl_t sioioctl; 341static d_stop_t siostop; 342static d_devtotty_t siodevtotty; 343 344#define CDEV_MAJOR 28 345static struct cdevsw sio_cdevsw = { 346 /* open */ sioopen, 347 /* close */ sioclose, 348 /* read */ sioread, 349 /* write */ siowrite, 350 /* ioctl */ sioioctl, 351 /* stop */ siostop, 352 /* reset */ noreset, 353 /* devtotty */ siodevtotty, 354 /* poll */ ttpoll, 355 /* mmap */ nommap, 356 /* strategy */ nostrategy, 357 /* name */ driver_name, 358 /* parms */ noparms, 359 /* maj */ CDEV_MAJOR, 360 /* dump */ nodump, 361 /* psize */ nopsize, 362 /* flags */ D_TTY, 363 /* maxio */ 0, 364 /* bmaj */ -1 365}; 366 367int comconsole = -1; 368static volatile speed_t comdefaultrate = CONSPEED; 369#ifdef __alpha__ 370static volatile speed_t gdbdefaultrate = CONSPEED; 371#endif 372static u_int com_events; /* input chars + weighted output completions */ 373static Port_t siocniobase; 374static int siocnunit; 375static Port_t siogdbiobase; 376static int siogdbunit = -1; 377static bool_t sio_registered; 378static int sio_timeout; 379static int sio_timeouts_until_log; 380static struct callout_handle sio_timeout_handle 381 = CALLOUT_HANDLE_INITIALIZER(&sio_timeout_handle); 382 383static struct speedtab comspeedtab[] = { 384 { 0, 0 }, 385 { 50, COMBRD(50) }, 386 { 75, COMBRD(75) }, 387 { 110, COMBRD(110) }, 388 { 134, COMBRD(134) }, 389 { 150, COMBRD(150) }, 390 { 200, COMBRD(200) }, 391 { 300, COMBRD(300) }, 392 { 600, COMBRD(600) }, 393 { 1200, COMBRD(1200) }, 394 { 1800, COMBRD(1800) }, 395 { 2400, COMBRD(2400) }, 396 { 4800, COMBRD(4800) }, 397 { 9600, COMBRD(9600) }, 398 { 19200, COMBRD(19200) }, 399 { 38400, COMBRD(38400) }, 400 { 57600, COMBRD(57600) }, 401 { 115200, COMBRD(115200) }, 402 { -1, -1 } 403}; 404 405#ifdef COM_ESP 406/* XXX configure this properly. */ 407static Port_t likely_com_ports[] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8, }; 408static Port_t likely_esp_ports[] = { 0x140, 0x180, 0x280, 0 }; 409#endif 410 411/* 412 * handle sysctl read/write requests for console speed 413 * 414 * In addition to setting comdefaultrate for I/O through /dev/console, 415 * also set the initial and lock values for the /dev/ttyXX device 416 * if there is one associated with the console. Finally, if the /dev/tty 417 * device has already been open, change the speed on the open running port 418 * itself. 419 */ 420 421static int 422sysctl_machdep_comdefaultrate SYSCTL_HANDLER_ARGS 423{ 424 int error, s; 425 speed_t newspeed; 426 struct com_s *com; 427 struct tty *tp; 428 429 newspeed = comdefaultrate; 430 431 error = sysctl_handle_opaque(oidp, &newspeed, sizeof newspeed, req); 432 if (error || !req->newptr) 433 return (error); 434 435 comdefaultrate = newspeed; 436 437 if (comconsole < 0) /* serial console not selected? */ 438 return (0); 439 440 com = com_addr(comconsole); 441 if (!com) 442 return (ENXIO); 443 444 /* 445 * set the initial and lock rates for /dev/ttydXX and /dev/cuaXX 446 * (note, the lock rates really are boolean -- if non-zero, disallow 447 * speed changes) 448 */ 449 com->it_in.c_ispeed = com->it_in.c_ospeed = 450 com->lt_in.c_ispeed = com->lt_in.c_ospeed = 451 com->it_out.c_ispeed = com->it_out.c_ospeed = 452 com->lt_out.c_ispeed = com->lt_out.c_ospeed = comdefaultrate; 453 454 /* 455 * if we're open, change the running rate too 456 */ 457 tp = com->tp; 458 if (tp && (tp->t_state & TS_ISOPEN)) { 459 tp->t_termios.c_ispeed = 460 tp->t_termios.c_ospeed = comdefaultrate; 461 s = spltty(); 462 error = comparam(tp, &tp->t_termios); 463 splx(s); 464 } 465 return error; 466} 467 468SYSCTL_PROC(_machdep, OID_AUTO, conspeed, CTLTYPE_INT | CTLFLAG_RW, 469 0, 0, sysctl_machdep_comdefaultrate, "I", ""); 470 471#if NCARD > 0 472/* 473 * PC-Card (PCMCIA) specific code. 474 */ 475static int sioinit __P((struct pccard_devinfo *)); 476static void siounload __P((struct pccard_devinfo *)); 477static int card_intr __P((struct pccard_devinfo *)); 478 479PCCARD_MODULE(sio, sioinit, siounload, card_intr, 0, tty_imask); 480 481/* 482 * Initialize the device - called from Slot manager. 483 */ 484int 485sioinit(struct pccard_devinfo *devi) 486{ 487 488 /* validate unit number. */ 489 if (devi->isahd.id_unit >= (NSIOTOT)) 490 return(ENODEV); 491 /* Make sure it isn't already probed. */ 492 if (com_addr(devi->isahd.id_unit)) 493 return(EBUSY); 494 495 /* It's already probed as serial by Upper */ 496 devi->isahd.id_flags |= COM_C_NOPROBE; 497 498 /* 499 * attach the device. 500 */ 501 if (sioattach(devi->isahd.id_device) == 0) 502 return(ENXIO); 503 504 return(0); 505} 506 507/* 508 * siounload - unload the driver and clear the table. 509 * XXX TODO: 510 * This is usually called when the card is ejected, but 511 * can be caused by a modunload of a controller driver. 512 * The idea is to reset the driver's view of the device 513 * and ensure that any driver entry points such as 514 * read and write do not hang. 515 */ 516static void 517siounload(struct pccard_devinfo *devi) 518{ 519 struct com_s *com; 520 521 if (!devi) { 522 printf("NULL devi in siounload\n"); 523 return; 524 } 525 com = com_addr(devi->isahd.id_unit); 526 if (!com) { 527 printf("NULL com in siounload\n"); 528 return; 529 } 530 if (!com->iobase) { 531 printf("sio%d already unloaded!\n",devi->isahd.id_unit); 532 return; 533 } 534 if (com->tp && (com->tp->t_state & TS_ISOPEN)) { 535 com->gone = 1; 536 printf("sio%d: unload\n", devi->isahd.id_unit); 537 com->tp->t_gen++; 538 ttyclose(com->tp); 539 ttwakeup(com->tp); 540 ttwwakeup(com->tp); 541 } else { 542 if (com->ibuf != NULL) 543 free(com->ibuf, M_DEVBUF); 544 free(com, M_DEVBUF); 545 printf("sio%d: unload,gone\n", devi->isahd.id_unit); 546 } 547} 548 549/* 550 * card_intr - Shared interrupt called from 551 * front end of PC-Card handler. 552 */ 553static int 554card_intr(struct pccard_devinfo *devi) 555{ 556 struct com_s *com; 557 558 COM_LOCK(); 559 com = com_addr(devi->isahd.id_unit); 560 if (com && !com->gone) 561 siointr1(com_addr(devi->isahd.id_unit)); 562 COM_UNLOCK(); 563 return(1); 564} 565#endif /* NCARD > 0 */ 566 567#define SET_FLAG(dev, bit) isa_set_flags(dev, isa_get_flags(dev) | (bit)) 568#define CLR_FLAG(dev, bit) isa_set_flags(dev, isa_get_flags(dev) & ~(bit)) 569 570static struct isa_pnp_id sio_ids[] = { 571 {0x0005d041, "Standard PC COM port"}, /* PNP0500 */ 572 {0x0105d041, "16550A-compatible COM port"}, /* PNP0501 */ 573 {0x0205d041, "Multiport serial device (non-intelligent 16550)"}, /* PNP0502 */ 574 {0x1005d041, "Generic IRDA-compatible device"}, /* PNP0510 */ 575 {0x1105d041, "Generic IRDA-compatible device"}, /* PNP0511 */ 576 {0x31307256, "USR3031"}, /* USR3031 */ 577 {0} 578}; 579 580static int 581sioprobe(dev) 582 device_t dev; 583{ 584 static bool_t already_init; 585 bool_t failures[10]; 586 int fn; 587 device_t idev; 588 Port_t iobase; 589 intrmask_t irqmap[4]; 590 intrmask_t irqs; 591 u_char mcr_image; 592 int result; 593 device_t xdev; 594 u_int flags = isa_get_flags(dev); 595 int rid; 596 struct resource *port; 597 598 /* Check isapnp ids */ 599 if (ISA_PNP_PROBE(device_get_parent(dev), dev, sio_ids) == ENXIO) 600 return (ENXIO); 601 602 rid = 0; 603 port = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid, 604 0, ~0, IO_COMSIZE, RF_ACTIVE); 605 if (!port) 606 return ENXIO; 607 608 if (!already_init) { 609 /* 610 * Turn off MCR_IENABLE for all likely serial ports. An unused 611 * port with its MCR_IENABLE gate open will inhibit interrupts 612 * from any used port that shares the interrupt vector. 613 * XXX the gate enable is elsewhere for some multiports. 614 */ 615 device_t *devs; 616 int count, i; 617 618 devclass_get_devices(sio_devclass, &devs, &count); 619 for (i = 0; i < count; i++) { 620 xdev = devs[i]; 621 if (device_is_enabled(xdev)) 622 outb(isa_get_port(xdev) + com_mcr, 0); 623 } 624 free(devs, M_TEMP); 625 already_init = TRUE; 626 } 627 628 if (COM_LLCONSOLE(flags)) { 629 printf("sio%d: reserved for low-level i/o\n", 630 device_get_unit(dev)); 631 return (ENXIO); 632 } 633 634 /* 635 * If the device is on a multiport card and has an AST/4 636 * compatible interrupt control register, initialize this 637 * register and prepare to leave MCR_IENABLE clear in the mcr. 638 * Otherwise, prepare to set MCR_IENABLE in the mcr. 639 * Point idev to the device struct giving the correct id_irq. 640 * This is the struct for the master device if there is one. 641 */ 642 idev = dev; 643 mcr_image = MCR_IENABLE; 644#ifdef COM_MULTIPORT 645 if (COM_ISMULTIPORT(flags)) { 646 idev = devclass_get_device(sio_devclass, COM_MPMASTER(flags)); 647 if (idev == NULL) { 648 printf("sio%d: master device %d not configured\n", 649 device_get_unit(dev), COM_MPMASTER(flags)); 650 idev = dev; 651 } 652 if (!COM_NOTAST4(flags)) { 653 outb(isa_get_port(idev) + com_scr, 654 isa_get_irq(idev) >= 0 ? 0x80 : 0); 655 mcr_image = 0; 656 } 657 } 658#endif /* COM_MULTIPORT */ 659 if (isa_get_irq(idev) < 0) 660 mcr_image = 0; 661 662 bzero(failures, sizeof failures); 663 iobase = rman_get_start(port); 664 665 /* 666 * We don't want to get actual interrupts, just masked ones. 667 * Interrupts from this line should already be masked in the ICU, 668 * but mask them in the processor as well in case there are some 669 * (misconfigured) shared interrupts. 670 */ 671 disable_intr(); 672/* EXTRA DELAY? */ 673 674 /* 675 * Initialize the speed and the word size and wait long enough to 676 * drain the maximum of 16 bytes of junk in device output queues. 677 * The speed is undefined after a master reset and must be set 678 * before relying on anything related to output. There may be 679 * junk after a (very fast) soft reboot and (apparently) after 680 * master reset. 681 * XXX what about the UART bug avoided by waiting in comparam()? 682 * We don't want to to wait long enough to drain at 2 bps. 683 */ 684 if (iobase == siocniobase) 685 DELAY((16 + 1) * 1000000 / (comdefaultrate / 10)); 686 else { 687 outb(iobase + com_cfcr, CFCR_DLAB | CFCR_8BITS); 688 outb(iobase + com_dlbl, COMBRD(SIO_TEST_SPEED) & 0xff); 689 outb(iobase + com_dlbh, (u_int) COMBRD(SIO_TEST_SPEED) >> 8); 690 outb(iobase + com_cfcr, CFCR_8BITS); 691 DELAY((16 + 1) * 1000000 / (SIO_TEST_SPEED / 10)); 692 } 693 694 /* 695 * Enable the interrupt gate and disable device interupts. This 696 * should leave the device driving the interrupt line low and 697 * guarantee an edge trigger if an interrupt can be generated. 698 */ 699/* EXTRA DELAY? */ 700 outb(iobase + com_mcr, mcr_image); 701 outb(iobase + com_ier, 0); 702 DELAY(1000); /* XXX */ 703 irqmap[0] = isa_irq_pending(); 704 705 /* 706 * Attempt to set loopback mode so that we can send a null byte 707 * without annoying any external device. 708 */ 709/* EXTRA DELAY? */ 710 outb(iobase + com_mcr, mcr_image | MCR_LOOPBACK); 711 712 /* 713 * Attempt to generate an output interrupt. On 8250's, setting 714 * IER_ETXRDY generates an interrupt independent of the current 715 * setting and independent of whether the THR is empty. On 16450's, 716 * setting IER_ETXRDY generates an interrupt independent of the 717 * current setting. On 16550A's, setting IER_ETXRDY only 718 * generates an interrupt when IER_ETXRDY is not already set. 719 */ 720 outb(iobase + com_ier, IER_ETXRDY); 721 722 /* 723 * On some 16x50 incompatibles, setting IER_ETXRDY doesn't generate 724 * an interrupt. They'd better generate one for actually doing 725 * output. Loopback may be broken on the same incompatibles but 726 * it's unlikely to do more than allow the null byte out. 727 */ 728 outb(iobase + com_data, 0); 729 DELAY((1 + 2) * 1000000 / (SIO_TEST_SPEED / 10)); 730 731 /* 732 * Turn off loopback mode so that the interrupt gate works again 733 * (MCR_IENABLE was hidden). This should leave the device driving 734 * an interrupt line high. It doesn't matter if the interrupt 735 * line oscillates while we are not looking at it, since interrupts 736 * are disabled. 737 */ 738/* EXTRA DELAY? */ 739 outb(iobase + com_mcr, mcr_image); 740 741 /* 742 * It's a definitly Serial PCMCIA(16550A), but still be required 743 * for IIR_TXRDY implementation ( Palido 321s, DC-1S... ) 744 */ 745 if ( COM_NOPROBE(flags) ) { 746 /* Reading IIR register twice */ 747 for ( fn = 0; fn < 2; fn ++ ) { 748 DELAY(10000); 749 failures[6] = inb(iobase + com_iir); 750 } 751 /* Check IIR_TXRDY clear ? */ 752 result = 0; 753 if ( failures[6] & IIR_TXRDY ) { 754 /* Nop, Double check with clearing IER */ 755 outb(iobase + com_ier, 0); 756 if ( inb(iobase + com_iir) & IIR_NOPEND ) { 757 /* Ok. we're familia this gang */ 758 SET_FLAG(dev, COM_C_IIR_TXRDYBUG); /* Set IIR_TXRDYBUG */ 759 } else { 760 /* Unknown, Just omit this chip.. XXX */ 761 result = ENXIO; 762 } 763 } else { 764 /* OK. this is well-known guys */ 765 CLR_FLAG(dev, COM_C_IIR_TXRDYBUG); /*Clear IIR_TXRDYBUG*/ 766 } 767 outb(iobase + com_cfcr, CFCR_8BITS); 768 enable_intr(); 769 bus_release_resource(dev, SYS_RES_IOPORT, rid, port); 770 return (iobase == siocniobase ? 0 : result); 771 } 772 773 /* 774 * Check that 775 * o the CFCR, IER and MCR in UART hold the values written to them 776 * (the values happen to be all distinct - this is good for 777 * avoiding false positive tests from bus echoes). 778 * o an output interrupt is generated and its vector is correct. 779 * o the interrupt goes away when the IIR in the UART is read. 780 */ 781/* EXTRA DELAY? */ 782 failures[0] = inb(iobase + com_cfcr) - CFCR_8BITS; 783 failures[1] = inb(iobase + com_ier) - IER_ETXRDY; 784 failures[2] = inb(iobase + com_mcr) - mcr_image; 785 DELAY(10000); /* Some internal modems need this time */ 786 irqmap[1] = isa_irq_pending(); 787 failures[4] = (inb(iobase + com_iir) & IIR_IMASK) - IIR_TXRDY; 788 DELAY(1000); /* XXX */ 789 irqmap[2] = isa_irq_pending(); 790 failures[6] = (inb(iobase + com_iir) & IIR_IMASK) - IIR_NOPEND; 791 792 /* 793 * Turn off all device interrupts and check that they go off properly. 794 * Leave MCR_IENABLE alone. For ports without a master port, it gates 795 * the OUT2 output of the UART to 796 * the ICU input. Closing the gate would give a floating ICU input 797 * (unless there is another device driving it) and spurious interrupts. 798 * (On the system that this was first tested on, the input floats high 799 * and gives a (masked) interrupt as soon as the gate is closed.) 800 */ 801 outb(iobase + com_ier, 0); 802 outb(iobase + com_cfcr, CFCR_8BITS); /* dummy to avoid bus echo */ 803 failures[7] = inb(iobase + com_ier); 804 DELAY(1000); /* XXX */ 805 irqmap[3] = isa_irq_pending(); 806 failures[9] = (inb(iobase + com_iir) & IIR_IMASK) - IIR_NOPEND; 807 808 enable_intr(); 809 810 irqs = irqmap[1] & ~irqmap[0]; 811 if (isa_get_irq(idev) >= 0 && ((1 << isa_get_irq(idev)) & irqs) == 0) 812 printf( 813 "sio%d: configured irq %d not in bitmap of probed irqs %#x\n", 814 device_get_unit(dev), isa_get_irq(idev), irqs); 815 if (bootverbose) 816 printf("sio%d: irq maps: %#x %#x %#x %#x\n", 817 device_get_unit(dev), 818 irqmap[0], irqmap[1], irqmap[2], irqmap[3]); 819 820 result = 0; 821 for (fn = 0; fn < sizeof failures; ++fn) 822 if (failures[fn]) { 823 outb(iobase + com_mcr, 0); 824 result = ENXIO; 825 if (bootverbose) { 826 printf("sio%d: probe failed test(s):", 827 device_get_unit(dev)); 828 for (fn = 0; fn < sizeof failures; ++fn) 829 if (failures[fn]) 830 printf(" %d", fn); 831 printf("\n"); 832 } 833 break; 834 } 835 bus_release_resource(dev, SYS_RES_IOPORT, rid, port); 836 return (iobase == siocniobase ? 0 : result); 837} 838 839#ifdef COM_ESP 840static int 841espattach(com, esp_port) 842 struct com_s *com; 843 Port_t esp_port; 844{ 845 u_char dips; 846 u_char val; 847 848 /* 849 * Check the ESP-specific I/O port to see if we're an ESP 850 * card. If not, return failure immediately. 851 */ 852 if ((inb(esp_port) & 0xf3) == 0) { 853 printf(" port 0x%x is not an ESP board?\n", esp_port); 854 return (0); 855 } 856 857 /* 858 * We've got something that claims to be a Hayes ESP card. 859 * Let's hope so. 860 */ 861 862 /* Get the dip-switch configuration */ 863 outb(esp_port + ESP_CMD1, ESP_GETDIPS); 864 dips = inb(esp_port + ESP_STATUS1); 865 866 /* 867 * Bits 0,1 of dips say which COM port we are. 868 */ 869 if (com->iobase == likely_com_ports[dips & 0x03]) 870 printf(" : ESP"); 871 else { 872 printf(" esp_port has com %d\n", dips & 0x03); 873 return (0); 874 } 875 876 /* 877 * Check for ESP version 2.0 or later: bits 4,5,6 = 010. 878 */ 879 outb(esp_port + ESP_CMD1, ESP_GETTEST); 880 val = inb(esp_port + ESP_STATUS1); /* clear reg 1 */ 881 val = inb(esp_port + ESP_STATUS2); 882 if ((val & 0x70) < 0x20) { 883 printf("-old (%o)", val & 0x70); 884 return (0); 885 } 886 887 /* 888 * Check for ability to emulate 16550: bit 7 == 1 889 */ 890 if ((dips & 0x80) == 0) { 891 printf(" slave"); 892 return (0); 893 } 894 895 /* 896 * Okay, we seem to be a Hayes ESP card. Whee. 897 */ 898 com->esp = TRUE; 899 com->esp_port = esp_port; 900 return (1); 901} 902#endif /* COM_ESP */ 903 904static int 905sioattach(dev) 906 device_t dev; 907{ 908 struct com_s *com; 909#ifdef COM_ESP 910 Port_t *espp; 911#endif 912 Port_t iobase; 913 int unit; 914 void *ih; 915 u_int flags = isa_get_flags(dev); 916 int rid; 917 struct resource *port; 918 919 rid = 0; 920 port = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid, 921 0, ~0, IO_COMSIZE, RF_ACTIVE); 922 if (!port) 923 return ENXIO; 924 925 iobase = rman_get_start(port); 926 unit = device_get_unit(dev); 927 com = device_get_softc(dev); 928 929 /* 930 * sioprobe() has initialized the device registers as follows: 931 * o cfcr = CFCR_8BITS. 932 * It is most important that CFCR_DLAB is off, so that the 933 * data port is not hidden when we enable interrupts. 934 * o ier = 0. 935 * Interrupts are only enabled when the line is open. 936 * o mcr = MCR_IENABLE, or 0 if the port has AST/4 compatible 937 * interrupt control register or the config specifies no irq. 938 * Keeping MCR_DTR and MCR_RTS off might stop the external 939 * device from sending before we are ready. 940 */ 941 bzero(com, sizeof *com); 942 com->unit = unit; 943 com->ioportres = port; 944 com->cfcr_image = CFCR_8BITS; 945 com->dtr_wait = 3 * hz; 946 com->loses_outints = COM_LOSESOUTINTS(flags) != 0; 947 com->no_irq = isa_get_irq(dev) < 0; 948 com->tx_fifo_size = 1; 949 com->obufs[0].l_head = com->obuf1; 950 com->obufs[1].l_head = com->obuf2; 951 952 com->iobase = iobase; 953 com->data_port = iobase + com_data; 954 com->int_id_port = iobase + com_iir; 955 com->modem_ctl_port = iobase + com_mcr; 956 com->mcr_image = inb(com->modem_ctl_port); 957 com->line_status_port = iobase + com_lsr; 958 com->modem_status_port = iobase + com_msr; 959 com->intr_ctl_port = iobase + com_ier; 960 961 /* 962 * We don't use all the flags from <sys/ttydefaults.h> since they 963 * are only relevant for logins. It's important to have echo off 964 * initially so that the line doesn't start blathering before the 965 * echo flag can be turned off. 966 */ 967 com->it_in.c_iflag = 0; 968 com->it_in.c_oflag = 0; 969 com->it_in.c_cflag = TTYDEF_CFLAG; 970 com->it_in.c_lflag = 0; 971 if (unit == comconsole) { 972 com->it_in.c_iflag = TTYDEF_IFLAG; 973 com->it_in.c_oflag = TTYDEF_OFLAG; 974 com->it_in.c_cflag = TTYDEF_CFLAG | CLOCAL; 975 com->it_in.c_lflag = TTYDEF_LFLAG; 976 com->lt_out.c_cflag = com->lt_in.c_cflag = CLOCAL; 977 com->lt_out.c_ispeed = com->lt_out.c_ospeed = 978 com->lt_in.c_ispeed = com->lt_in.c_ospeed = 979 com->it_in.c_ispeed = com->it_in.c_ospeed = comdefaultrate; 980 } else 981 com->it_in.c_ispeed = com->it_in.c_ospeed = TTYDEF_SPEED; 982 if (siosetwater(com, com->it_in.c_ispeed) != 0) { 983 enable_intr(); 984 free(com, M_DEVBUF); 985 return (0); 986 } 987 enable_intr(); 988 termioschars(&com->it_in); 989 com->it_out = com->it_in; 990 991 /* attempt to determine UART type */ 992 printf("sio%d: type", unit); 993 994 995#ifdef COM_MULTIPORT 996 if (!COM_ISMULTIPORT(flags) && !COM_IIR_TXRDYBUG(flags)) 997#else 998 if (!COM_IIR_TXRDYBUG(flags)) 999#endif 1000 { 1001 u_char scr; 1002 u_char scr1; 1003 u_char scr2; 1004 1005 scr = inb(iobase + com_scr); 1006 outb(iobase + com_scr, 0xa5); 1007 scr1 = inb(iobase + com_scr); 1008 outb(iobase + com_scr, 0x5a); 1009 scr2 = inb(iobase + com_scr); 1010 outb(iobase + com_scr, scr); 1011 if (scr1 != 0xa5 || scr2 != 0x5a) { 1012 printf(" 8250"); 1013 goto determined_type; 1014 } 1015 } 1016 outb(iobase + com_fifo, FIFO_ENABLE | FIFO_RX_HIGH); 1017 DELAY(100); 1018 com->st16650a = 0; 1019 switch (inb(com->int_id_port) & IIR_FIFO_MASK) { 1020 case FIFO_RX_LOW: 1021 printf(" 16450"); 1022 break; 1023 case FIFO_RX_MEDL: 1024 printf(" 16450?"); 1025 break; 1026 case FIFO_RX_MEDH: 1027 printf(" 16550?"); 1028 break; 1029 case FIFO_RX_HIGH: 1030 if (COM_NOFIFO(flags)) { 1031 printf(" 16550A fifo disabled"); 1032 } else { 1033 com->hasfifo = TRUE; 1034 if (COM_ST16650A(flags)) { 1035 com->st16650a = 1; 1036 com->tx_fifo_size = 32; 1037 printf(" ST16650A"); 1038 } else { 1039 com->tx_fifo_size = COM_FIFOSIZE(flags); 1040 printf(" 16550A"); 1041 } 1042 } 1043#ifdef COM_ESP 1044 for (espp = likely_esp_ports; *espp != 0; espp++) 1045 if (espattach(com, *espp)) { 1046 com->tx_fifo_size = 1024; 1047 break; 1048 } 1049#endif 1050 if (!com->st16650a) { 1051 if (!com->tx_fifo_size) 1052 com->tx_fifo_size = 16; 1053 else 1054 printf(" lookalike with %d bytes FIFO", 1055 com->tx_fifo_size); 1056 } 1057 1058 break; 1059 } 1060 1061#ifdef COM_ESP 1062 if (com->esp) { 1063 /* 1064 * Set 16550 compatibility mode. 1065 * We don't use the ESP_MODE_SCALE bit to increase the 1066 * fifo trigger levels because we can't handle large 1067 * bursts of input. 1068 * XXX flow control should be set in comparam(), not here. 1069 */ 1070 outb(com->esp_port + ESP_CMD1, ESP_SETMODE); 1071 outb(com->esp_port + ESP_CMD2, ESP_MODE_RTS | ESP_MODE_FIFO); 1072 1073 /* Set RTS/CTS flow control. */ 1074 outb(com->esp_port + ESP_CMD1, ESP_SETFLOWTYPE); 1075 outb(com->esp_port + ESP_CMD2, ESP_FLOW_RTS); 1076 outb(com->esp_port + ESP_CMD2, ESP_FLOW_CTS); 1077 1078 /* Set flow-control levels. */ 1079 outb(com->esp_port + ESP_CMD1, ESP_SETRXFLOW); 1080 outb(com->esp_port + ESP_CMD2, HIBYTE(768)); 1081 outb(com->esp_port + ESP_CMD2, LOBYTE(768)); 1082 outb(com->esp_port + ESP_CMD2, HIBYTE(512)); 1083 outb(com->esp_port + ESP_CMD2, LOBYTE(512)); 1084 } 1085#endif /* COM_ESP */ 1086 outb(iobase + com_fifo, 0); 1087determined_type: ; 1088 1089#ifdef COM_MULTIPORT 1090 if (COM_ISMULTIPORT(flags)) { 1091 com->multiport = TRUE; 1092 printf(" (multiport"); 1093 if (unit == COM_MPMASTER(flags)) 1094 printf(" master"); 1095 printf(")"); 1096 com->no_irq = 1097 isa_get_irq(devclass_get_device 1098 (sio_devclass, COM_MPMASTER(flags))) < 0; 1099 } 1100#endif /* COM_MULTIPORT */ 1101 if (unit == comconsole) 1102 printf(", console"); 1103 if ( COM_IIR_TXRDYBUG(flags) ) 1104 printf(" with a bogus IIR_TXRDY register"); 1105 printf("\n"); 1106 1107 if (!sio_registered) { 1108 register_swi(SWI_TTY, siopoll); 1109 sio_registered = TRUE; 1110 } 1111 make_dev(&sio_cdevsw, unit, 1112 UID_ROOT, GID_WHEEL, 0600, "ttyd%r", unit); 1113 make_dev(&sio_cdevsw, unit | CONTROL_INIT_STATE, 1114 UID_ROOT, GID_WHEEL, 0600, "ttyid%r", unit); 1115 make_dev(&sio_cdevsw, unit | CONTROL_LOCK_STATE, 1116 UID_ROOT, GID_WHEEL, 0600, "ttyld%r", unit); 1117 make_dev(&sio_cdevsw, unit | CALLOUT_MASK, 1118 UID_UUCP, GID_DIALER, 0660, "cuaa%r", unit); 1119 make_dev(&sio_cdevsw, unit | CALLOUT_MASK | CONTROL_INIT_STATE, 1120 UID_UUCP, GID_DIALER, 0660, "cuaia%r", unit); 1121 make_dev(&sio_cdevsw, unit | CALLOUT_MASK | CONTROL_LOCK_STATE, 1122 UID_UUCP, GID_DIALER, 0660, "cuala%r", unit); 1123 com->flags = flags; 1124 com->pps.ppscap = PPS_CAPTUREASSERT | PPS_CAPTURECLEAR; 1125 pps_init(&com->pps); 1126 1127 rid = 0; 1128 com->irqres = bus_alloc_resource(dev, SYS_RES_IRQ, &rid, 0ul, ~0ul, 1, 1129 RF_SHAREABLE | RF_ACTIVE); 1130 BUS_SETUP_INTR(device_get_parent(dev), dev, com->irqres, 1131 INTR_TYPE_TTY | INTR_TYPE_FAST, 1132 siointr, com, &ih); 1133 1134 return (0); 1135} 1136 1137static int 1138sioopen(dev, flag, mode, p) 1139 dev_t dev; 1140 int flag; 1141 int mode; 1142 struct proc *p; 1143{ 1144 struct com_s *com; 1145 int error; 1146 Port_t iobase; 1147 int mynor; 1148 int s; 1149 struct tty *tp; 1150 int unit; 1151 1152 mynor = minor(dev); 1153 unit = MINOR_TO_UNIT(mynor); 1154 if ((u_int) unit >= NSIOTOT || (com = com_addr(unit)) == NULL) 1155 return (ENXIO); 1156 if (com->gone) 1157 return (ENXIO); 1158 if (mynor & CONTROL_MASK) 1159 return (0); 1160 tp = dev->si_tty = com->tp = ttymalloc(com->tp); 1161 s = spltty(); 1162 /* 1163 * We jump to this label after all non-interrupted sleeps to pick 1164 * up any changes of the device state. 1165 */ 1166open_top: 1167 while (com->state & CS_DTR_OFF) { 1168 error = tsleep(&com->dtr_wait, TTIPRI | PCATCH, "siodtr", 0); 1169 if (com_addr(unit) == NULL) 1170 return (ENXIO); 1171 if (error != 0 || com->gone) 1172 goto out; 1173 } 1174 if (tp->t_state & TS_ISOPEN) { 1175 /* 1176 * The device is open, so everything has been initialized. 1177 * Handle conflicts. 1178 */ 1179 if (mynor & CALLOUT_MASK) { 1180 if (!com->active_out) { 1181 error = EBUSY; 1182 goto out; 1183 } 1184 } else { 1185 if (com->active_out) { 1186 if (flag & O_NONBLOCK) { 1187 error = EBUSY; 1188 goto out; 1189 } 1190 error = tsleep(&com->active_out, 1191 TTIPRI | PCATCH, "siobi", 0); 1192 if (com_addr(unit) == NULL) 1193 return (ENXIO); 1194 if (error != 0 || com->gone) 1195 goto out; 1196 goto open_top; 1197 } 1198 } 1199 if (tp->t_state & TS_XCLUDE && 1200 suser(p)) { 1201 error = EBUSY; 1202 goto out; 1203 } 1204 } else { 1205 /* 1206 * The device isn't open, so there are no conflicts. 1207 * Initialize it. Initialization is done twice in many 1208 * cases: to preempt sleeping callin opens if we are 1209 * callout, and to complete a callin open after DCD rises. 1210 */ 1211 tp->t_oproc = comstart; 1212 tp->t_param = comparam; 1213 tp->t_dev = dev; 1214 tp->t_termios = mynor & CALLOUT_MASK 1215 ? com->it_out : com->it_in; 1216 (void)commctl(com, TIOCM_DTR | TIOCM_RTS, DMSET); 1217 com->poll = com->no_irq; 1218 com->poll_output = com->loses_outints; 1219 ++com->wopeners; 1220 error = comparam(tp, &tp->t_termios); 1221 --com->wopeners; 1222 if (error != 0) 1223 goto out; 1224 /* 1225 * XXX we should goto open_top if comparam() slept. 1226 */ 1227 iobase = com->iobase; 1228 if (com->hasfifo) { 1229 /* 1230 * (Re)enable and drain fifos. 1231 * 1232 * Certain SMC chips cause problems if the fifos 1233 * are enabled while input is ready. Turn off the 1234 * fifo if necessary to clear the input. We test 1235 * the input ready bit after enabling the fifos 1236 * since we've already enabled them in comparam() 1237 * and to handle races between enabling and fresh 1238 * input. 1239 */ 1240 while (TRUE) { 1241 outb(iobase + com_fifo, 1242 FIFO_RCV_RST | FIFO_XMT_RST 1243 | com->fifo_image); 1244 /* 1245 * XXX the delays are for superstitious 1246 * historical reasons. It must be less than 1247 * the character time at the maximum 1248 * supported speed (87 usec at 115200 bps 1249 * 8N1). Otherwise we might loop endlessly 1250 * if data is streaming in. We used to use 1251 * delays of 100. That usually worked 1252 * because DELAY(100) used to usually delay 1253 * for about 85 usec instead of 100. 1254 */ 1255 DELAY(50); 1256 if (!(inb(com->line_status_port) & LSR_RXRDY)) 1257 break; 1258 outb(iobase + com_fifo, 0); 1259 DELAY(50); 1260 (void) inb(com->data_port); 1261 } 1262 } 1263 1264 disable_intr(); 1265 (void) inb(com->line_status_port); 1266 (void) inb(com->data_port); 1267 com->prev_modem_status = com->last_modem_status 1268 = inb(com->modem_status_port); 1269 if (COM_IIR_TXRDYBUG(com->flags)) { 1270 outb(com->intr_ctl_port, IER_ERXRDY | IER_ERLS 1271 | IER_EMSC); 1272 } else { 1273 outb(com->intr_ctl_port, IER_ERXRDY | IER_ETXRDY 1274 | IER_ERLS | IER_EMSC); 1275 } 1276 enable_intr(); 1277 /* 1278 * Handle initial DCD. Callout devices get a fake initial 1279 * DCD (trapdoor DCD). If we are callout, then any sleeping 1280 * callin opens get woken up and resume sleeping on "siobi" 1281 * instead of "siodcd". 1282 */ 1283 /* 1284 * XXX `mynor & CALLOUT_MASK' should be 1285 * `tp->t_cflag & (SOFT_CARRIER | TRAPDOOR_CARRIER) where 1286 * TRAPDOOR_CARRIER is the default initial state for callout 1287 * devices and SOFT_CARRIER is like CLOCAL except it hides 1288 * the true carrier. 1289 */ 1290 if (com->prev_modem_status & MSR_DCD || mynor & CALLOUT_MASK) 1291 (*linesw[tp->t_line].l_modem)(tp, 1); 1292 } 1293 /* 1294 * Wait for DCD if necessary. 1295 */ 1296 if (!(tp->t_state & TS_CARR_ON) && !(mynor & CALLOUT_MASK) 1297 && !(tp->t_cflag & CLOCAL) && !(flag & O_NONBLOCK)) { 1298 ++com->wopeners; 1299 error = tsleep(TSA_CARR_ON(tp), TTIPRI | PCATCH, "siodcd", 0); 1300 if (com_addr(unit) == NULL) 1301 return (ENXIO); 1302 --com->wopeners; 1303 if (error != 0 || com->gone) 1304 goto out; 1305 goto open_top; 1306 } 1307 error = (*linesw[tp->t_line].l_open)(dev, tp); 1308 disc_optim(tp, &tp->t_termios, com); 1309 if (tp->t_state & TS_ISOPEN && mynor & CALLOUT_MASK) 1310 com->active_out = TRUE; 1311 siosettimeout(); 1312out: 1313 splx(s); 1314 if (!(tp->t_state & TS_ISOPEN) && com->wopeners == 0) 1315 comhardclose(com); 1316 return (error); 1317} 1318 1319static int 1320sioclose(dev, flag, mode, p) 1321 dev_t dev; 1322 int flag; 1323 int mode; 1324 struct proc *p; 1325{ 1326 struct com_s *com; 1327 int mynor; 1328 int s; 1329 struct tty *tp; 1330 1331 mynor = minor(dev); 1332 if (mynor & CONTROL_MASK) 1333 return (0); 1334 com = com_addr(MINOR_TO_UNIT(mynor)); 1335 tp = com->tp; 1336 s = spltty(); 1337 (*linesw[tp->t_line].l_close)(tp, flag); 1338 disc_optim(tp, &tp->t_termios, com); 1339 siostop(tp, FREAD | FWRITE); 1340 comhardclose(com); 1341 ttyclose(tp); 1342 siosettimeout(); 1343 splx(s); 1344 if (com->gone) { 1345 printf("sio%d: gone\n", com->unit); 1346 s = spltty(); 1347 if (com->ibuf != NULL) 1348 free(com->ibuf, M_DEVBUF); 1349 bzero(tp, sizeof *tp); 1350 free(com, M_DEVBUF); 1351 splx(s); 1352 } 1353 return (0); 1354} 1355 1356static void 1357comhardclose(com) 1358 struct com_s *com; 1359{ 1360 Port_t iobase; 1361 int s; 1362 struct tty *tp; 1363 int unit; 1364 1365 unit = com->unit; 1366 iobase = com->iobase; 1367 s = spltty(); 1368 com->poll = FALSE; 1369 com->poll_output = FALSE; 1370 com->do_timestamp = FALSE; 1371 com->do_dcd_timestamp = FALSE; 1372 com->pps.ppsparam.mode = 0; 1373 outb(iobase + com_cfcr, com->cfcr_image &= ~CFCR_SBREAK); 1374 { 1375 outb(iobase + com_ier, 0); 1376 tp = com->tp; 1377 if (tp->t_cflag & HUPCL 1378 /* 1379 * XXX we will miss any carrier drop between here and the 1380 * next open. Perhaps we should watch DCD even when the 1381 * port is closed; it is not sufficient to check it at 1382 * the next open because it might go up and down while 1383 * we're not watching. 1384 */ 1385 || (!com->active_out 1386 && !(com->prev_modem_status & MSR_DCD) 1387 && !(com->it_in.c_cflag & CLOCAL)) 1388 || !(tp->t_state & TS_ISOPEN)) { 1389 (void)commctl(com, TIOCM_DTR, DMBIC); 1390 if (com->dtr_wait != 0 && !(com->state & CS_DTR_OFF)) { 1391 timeout(siodtrwakeup, com, com->dtr_wait); 1392 com->state |= CS_DTR_OFF; 1393 } 1394 } 1395 } 1396 if (com->hasfifo) { 1397 /* 1398 * Disable fifos so that they are off after controlled 1399 * reboots. Some BIOSes fail to detect 16550s when the 1400 * fifos are enabled. 1401 */ 1402 outb(iobase + com_fifo, 0); 1403 } 1404 com->active_out = FALSE; 1405 wakeup(&com->active_out); 1406 wakeup(TSA_CARR_ON(tp)); /* restart any wopeners */ 1407 splx(s); 1408} 1409 1410static int 1411sioread(dev, uio, flag) 1412 dev_t dev; 1413 struct uio *uio; 1414 int flag; 1415{ 1416 int mynor; 1417 struct com_s *com; 1418 1419 mynor = minor(dev); 1420 if (mynor & CONTROL_MASK) 1421 return (ENODEV); 1422 com = com_addr(MINOR_TO_UNIT(mynor)); 1423 if (com->gone) 1424 return (ENODEV); 1425 return ((*linesw[com->tp->t_line].l_read)(com->tp, uio, flag)); 1426} 1427 1428static int 1429siowrite(dev, uio, flag) 1430 dev_t dev; 1431 struct uio *uio; 1432 int flag; 1433{ 1434 int mynor; 1435 struct com_s *com; 1436 int unit; 1437 1438 mynor = minor(dev); 1439 if (mynor & CONTROL_MASK) 1440 return (ENODEV); 1441 1442 unit = MINOR_TO_UNIT(mynor); 1443 com = com_addr(unit); 1444 if (com->gone) 1445 return (ENODEV); 1446 /* 1447 * (XXX) We disallow virtual consoles if the physical console is 1448 * a serial port. This is in case there is a display attached that 1449 * is not the console. In that situation we don't need/want the X 1450 * server taking over the console. 1451 */ 1452 if (constty != NULL && unit == comconsole) 1453 constty = NULL; 1454 return ((*linesw[com->tp->t_line].l_write)(com->tp, uio, flag)); 1455} 1456 1457static void 1458siobusycheck(chan) 1459 void *chan; 1460{ 1461 struct com_s *com; 1462 int s; 1463 1464 com = (struct com_s *)chan; 1465 1466 /* 1467 * Clear TS_BUSY if low-level output is complete. 1468 * spl locking is sufficient because siointr1() does not set CS_BUSY. 1469 * If siointr1() clears CS_BUSY after we look at it, then we'll get 1470 * called again. Reading the line status port outside of siointr1() 1471 * is safe because CS_BUSY is clear so there are no output interrupts 1472 * to lose. 1473 */ 1474 s = spltty(); 1475 if (com->state & CS_BUSY) 1476 com->extra_state &= ~CSE_BUSYCHECK; /* False alarm. */ 1477 else if ((inb(com->line_status_port) & (LSR_TSRE | LSR_TXRDY)) 1478 == (LSR_TSRE | LSR_TXRDY)) { 1479 com->tp->t_state &= ~TS_BUSY; 1480 ttwwakeup(com->tp); 1481 com->extra_state &= ~CSE_BUSYCHECK; 1482 } else 1483 timeout(siobusycheck, com, hz / 100); 1484 splx(s); 1485} 1486 1487static void 1488siodtrwakeup(chan) 1489 void *chan; 1490{ 1491 struct com_s *com; 1492 1493 com = (struct com_s *)chan; 1494 com->state &= ~CS_DTR_OFF; 1495 wakeup(&com->dtr_wait); 1496} 1497 1498static void 1499sioinput(com) 1500 struct com_s *com; 1501{ 1502 u_char *buf; 1503 int incc; 1504 u_char line_status; 1505 int recv_data; 1506 struct tty *tp; 1507 1508 buf = com->ibuf; 1509 tp = com->tp; 1510 if (!(tp->t_state & TS_ISOPEN) || !(tp->t_cflag & CREAD)) { 1511 com_events -= (com->iptr - com->ibuf); 1512 com->iptr = com->ibuf; 1513 return; 1514 } 1515 if (tp->t_state & TS_CAN_BYPASS_L_RINT) { 1516 /* 1517 * Avoid the grotesquely inefficient lineswitch routine 1518 * (ttyinput) in "raw" mode. It usually takes about 450 1519 * instructions (that's without canonical processing or echo!). 1520 * slinput is reasonably fast (usually 40 instructions plus 1521 * call overhead). 1522 */ 1523 do { 1524 enable_intr(); 1525 incc = com->iptr - buf; 1526 if (tp->t_rawq.c_cc + incc > tp->t_ihiwat 1527 && (com->state & CS_RTS_IFLOW 1528 || tp->t_iflag & IXOFF) 1529 && !(tp->t_state & TS_TBLOCK)) 1530 ttyblock(tp); 1531 com->delta_error_counts[CE_TTY_BUF_OVERFLOW] 1532 += b_to_q((char *)buf, incc, &tp->t_rawq); 1533 buf += incc; 1534 tk_nin += incc; 1535 tk_rawcc += incc; 1536 tp->t_rawcc += incc; 1537 ttwakeup(tp); 1538 if (tp->t_state & TS_TTSTOP 1539 && (tp->t_iflag & IXANY 1540 || tp->t_cc[VSTART] == tp->t_cc[VSTOP])) { 1541 tp->t_state &= ~TS_TTSTOP; 1542 tp->t_lflag &= ~FLUSHO; 1543 comstart(tp); 1544 } 1545 disable_intr(); 1546 } while (buf < com->iptr); 1547 } else { 1548 do { 1549 enable_intr(); 1550 line_status = buf[com->ierroff]; 1551 recv_data = *buf++; 1552 if (line_status 1553 & (LSR_BI | LSR_FE | LSR_OE | LSR_PE)) { 1554 if (line_status & LSR_BI) 1555 recv_data |= TTY_BI; 1556 if (line_status & LSR_FE) 1557 recv_data |= TTY_FE; 1558 if (line_status & LSR_OE) 1559 recv_data |= TTY_OE; 1560 if (line_status & LSR_PE) 1561 recv_data |= TTY_PE; 1562 } 1563 (*linesw[tp->t_line].l_rint)(recv_data, tp); 1564 disable_intr(); 1565 } while (buf < com->iptr); 1566 } 1567 com_events -= (com->iptr - com->ibuf); 1568 com->iptr = com->ibuf; 1569 1570 /* 1571 * There is now room for another low-level buffer full of input, 1572 * so enable RTS if it is now disabled and there is room in the 1573 * high-level buffer. 1574 */ 1575 if ((com->state & CS_RTS_IFLOW) && !(com->mcr_image & MCR_RTS) && 1576 !(tp->t_state & TS_TBLOCK)) 1577 outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS); 1578} 1579 1580void 1581siointr(arg) 1582 void *arg; 1583{ 1584#ifndef COM_MULTIPORT 1585 COM_LOCK(); 1586 siointr1((struct com_s *) arg); 1587 COM_UNLOCK(); 1588#else /* COM_MULTIPORT */ 1589 bool_t possibly_more_intrs; 1590 int unit; 1591 struct com_s *com; 1592 1593 /* 1594 * Loop until there is no activity on any port. This is necessary 1595 * to get an interrupt edge more than to avoid another interrupt. 1596 * If the IRQ signal is just an OR of the IRQ signals from several 1597 * devices, then the edge from one may be lost because another is 1598 * on. 1599 */ 1600 COM_LOCK(); 1601 do { 1602 possibly_more_intrs = FALSE; 1603 for (unit = 0; unit < NSIOTOT; ++unit) { 1604 com = com_addr(unit); 1605 /* 1606 * XXX COM_LOCK(); 1607 * would it work here, or be counter-productive? 1608 */ 1609 if (com != NULL 1610 && !com->gone 1611 && (inb(com->int_id_port) & IIR_IMASK) 1612 != IIR_NOPEND) { 1613 siointr1(com); 1614 possibly_more_intrs = TRUE; 1615 } 1616 /* XXX COM_UNLOCK(); */ 1617 } 1618 } while (possibly_more_intrs); 1619 COM_UNLOCK(); 1620#endif /* COM_MULTIPORT */ 1621} 1622 1623static void 1624siointr1(com) 1625 struct com_s *com; 1626{ 1627 u_char line_status; 1628 u_char modem_status; 1629 u_char *ioptr; 1630 u_char recv_data; 1631 u_char int_ctl; 1632 u_char int_ctl_new; 1633 struct timecounter *tc; 1634 u_int count; 1635 1636 int_ctl = inb(com->intr_ctl_port); 1637 int_ctl_new = int_ctl; 1638 1639 while (!com->gone) { 1640 if (com->pps.ppsparam.mode & PPS_CAPTUREBOTH) { 1641 modem_status = inb(com->modem_status_port); 1642 if ((modem_status ^ com->last_modem_status) & MSR_DCD) { 1643 tc = timecounter; 1644 count = tc->tc_get_timecount(tc); 1645 pps_event(&com->pps, tc, count, 1646 (modem_status & MSR_DCD) ? 1647 PPS_CAPTUREASSERT : PPS_CAPTURECLEAR); 1648 } 1649 } 1650 line_status = inb(com->line_status_port); 1651 1652 /* input event? (check first to help avoid overruns) */ 1653 while (line_status & LSR_RCV_MASK) { 1654 /* break/unnattached error bits or real input? */ 1655 if (!(line_status & LSR_RXRDY)) 1656 recv_data = 0; 1657 else 1658 recv_data = inb(com->data_port); 1659 if (line_status & (LSR_BI | LSR_FE | LSR_PE)) { 1660 /* 1661 * Don't store BI if IGNBRK or FE/PE if IGNPAR. 1662 * Otherwise, push the work to a higher level 1663 * (to handle PARMRK) if we're bypassing. 1664 * Otherwise, convert BI/FE and PE+INPCK to 0. 1665 * 1666 * This makes bypassing work right in the 1667 * usual "raw" case (IGNBRK set, and IGNPAR 1668 * and INPCK clear). 1669 * 1670 * Note: BI together with FE/PE means just BI. 1671 */ 1672 if (line_status & LSR_BI) { 1673#if defined(DDB) && defined(BREAK_TO_DEBUGGER) 1674 if (com->unit == comconsole) { 1675 breakpoint(); 1676 goto cont; 1677 } 1678#endif 1679 if (com->tp == NULL 1680 || com->tp->t_iflag & IGNBRK) 1681 goto cont; 1682 } else { 1683 if (com->tp == NULL 1684 || com->tp->t_iflag & IGNPAR) 1685 goto cont; 1686 } 1687 if (com->tp->t_state & TS_CAN_BYPASS_L_RINT 1688 && (line_status & (LSR_BI | LSR_FE) 1689 || com->tp->t_iflag & INPCK)) 1690 recv_data = 0; 1691 } 1692 ++com->bytes_in; 1693 if (com->hotchar != 0 && recv_data == com->hotchar) 1694 setsofttty(); 1695 ioptr = com->iptr; 1696 if (ioptr >= com->ibufend) 1697 CE_RECORD(com, CE_INTERRUPT_BUF_OVERFLOW); 1698 else { 1699 if (com->do_timestamp) 1700 microtime(&com->timestamp); 1701 ++com_events; 1702 schedsofttty(); 1703#if 0 /* for testing input latency vs efficiency */ 1704if (com->iptr - com->ibuf == 8) 1705 setsofttty(); 1706#endif 1707 ioptr[0] = recv_data; 1708 ioptr[com->ierroff] = line_status; 1709 com->iptr = ++ioptr; 1710 if (ioptr == com->ihighwater 1711 && com->state & CS_RTS_IFLOW) 1712 outb(com->modem_ctl_port, 1713 com->mcr_image &= ~MCR_RTS); 1714 if (line_status & LSR_OE) 1715 CE_RECORD(com, CE_OVERRUN); 1716 } 1717cont: 1718 /* 1719 * "& 0x7F" is to avoid the gcc-1.40 generating a slow 1720 * jump from the top of the loop to here 1721 */ 1722 line_status = inb(com->line_status_port) & 0x7F; 1723 } 1724 1725 /* modem status change? (always check before doing output) */ 1726 modem_status = inb(com->modem_status_port); 1727 if (modem_status != com->last_modem_status) { 1728 if (com->do_dcd_timestamp 1729 && !(com->last_modem_status & MSR_DCD) 1730 && modem_status & MSR_DCD) 1731 microtime(&com->dcd_timestamp); 1732 1733 /* 1734 * Schedule high level to handle DCD changes. Note 1735 * that we don't use the delta bits anywhere. Some 1736 * UARTs mess them up, and it's easy to remember the 1737 * previous bits and calculate the delta. 1738 */ 1739 com->last_modem_status = modem_status; 1740 if (!(com->state & CS_CHECKMSR)) { 1741 com_events += LOTS_OF_EVENTS; 1742 com->state |= CS_CHECKMSR; 1743 setsofttty(); 1744 } 1745 1746 /* handle CTS change immediately for crisp flow ctl */ 1747 if (com->state & CS_CTS_OFLOW) { 1748 if (modem_status & MSR_CTS) 1749 com->state |= CS_ODEVREADY; 1750 else 1751 com->state &= ~CS_ODEVREADY; 1752 } 1753 } 1754 1755 /* output queued and everything ready? */ 1756 if (line_status & LSR_TXRDY 1757 && com->state >= (CS_BUSY | CS_TTGO | CS_ODEVREADY)) { 1758 ioptr = com->obufq.l_head; 1759 if (com->tx_fifo_size > 1) { 1760 u_int ocount; 1761 1762 ocount = com->obufq.l_tail - ioptr; 1763 if (ocount > com->tx_fifo_size) 1764 ocount = com->tx_fifo_size; 1765 com->bytes_out += ocount; 1766 do 1767 outb(com->data_port, *ioptr++); 1768 while (--ocount != 0); 1769 } else { 1770 outb(com->data_port, *ioptr++); 1771 ++com->bytes_out; 1772 } 1773 com->obufq.l_head = ioptr; 1774 if (COM_IIR_TXRDYBUG(com->flags)) { 1775 int_ctl_new = int_ctl | IER_ETXRDY; 1776 } 1777 if (ioptr >= com->obufq.l_tail) { 1778 struct lbq *qp; 1779 1780 qp = com->obufq.l_next; 1781 qp->l_queued = FALSE; 1782 qp = qp->l_next; 1783 if (qp != NULL) { 1784 com->obufq.l_head = qp->l_head; 1785 com->obufq.l_tail = qp->l_tail; 1786 com->obufq.l_next = qp; 1787 } else { 1788 /* output just completed */ 1789 if ( COM_IIR_TXRDYBUG(com->flags) ) { 1790 int_ctl_new = int_ctl & ~IER_ETXRDY; 1791 } 1792 com->state &= ~CS_BUSY; 1793 } 1794 if (!(com->state & CS_ODONE)) { 1795 com_events += LOTS_OF_EVENTS; 1796 com->state |= CS_ODONE; 1797 setsofttty(); /* handle at high level ASAP */ 1798 } 1799 } 1800 if ( COM_IIR_TXRDYBUG(com->flags) && (int_ctl != int_ctl_new)) { 1801 outb(com->intr_ctl_port, int_ctl_new); 1802 } 1803 } 1804 1805 /* finished? */ 1806#ifndef COM_MULTIPORT 1807 if ((inb(com->int_id_port) & IIR_IMASK) == IIR_NOPEND) 1808#endif /* COM_MULTIPORT */ 1809 return; 1810 } 1811} 1812 1813static int 1814sioioctl(dev, cmd, data, flag, p) 1815 dev_t dev; 1816 u_long cmd; 1817 caddr_t data; 1818 int flag; 1819 struct proc *p; 1820{ 1821 struct com_s *com; 1822 int error; 1823 Port_t iobase; 1824 int mynor; 1825 int s; 1826 struct tty *tp; 1827#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 1828 u_long oldcmd; 1829 struct termios term; 1830#endif 1831 1832 mynor = minor(dev); 1833 com = com_addr(MINOR_TO_UNIT(mynor)); 1834 if (com->gone) 1835 return (ENODEV); 1836 iobase = com->iobase; 1837 if (mynor & CONTROL_MASK) { 1838 struct termios *ct; 1839 1840 switch (mynor & CONTROL_MASK) { 1841 case CONTROL_INIT_STATE: 1842 ct = mynor & CALLOUT_MASK ? &com->it_out : &com->it_in; 1843 break; 1844 case CONTROL_LOCK_STATE: 1845 ct = mynor & CALLOUT_MASK ? &com->lt_out : &com->lt_in; 1846 break; 1847 default: 1848 return (ENODEV); /* /dev/nodev */ 1849 } 1850 switch (cmd) { 1851 case TIOCSETA: 1852 error = suser(p); 1853 if (error != 0) 1854 return (error); 1855 *ct = *(struct termios *)data; 1856 return (0); 1857 case TIOCGETA: 1858 *(struct termios *)data = *ct; 1859 return (0); 1860 case TIOCGETD: 1861 *(int *)data = TTYDISC; 1862 return (0); 1863 case TIOCGWINSZ: 1864 bzero(data, sizeof(struct winsize)); 1865 return (0); 1866 default: 1867 return (ENOTTY); 1868 } 1869 } 1870 tp = com->tp; 1871#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 1872 term = tp->t_termios; 1873 oldcmd = cmd; 1874 error = ttsetcompat(tp, &cmd, data, &term); 1875 if (error != 0) 1876 return (error); 1877 if (cmd != oldcmd) 1878 data = (caddr_t)&term; 1879#endif 1880 if (cmd == TIOCSETA || cmd == TIOCSETAW || cmd == TIOCSETAF) { 1881 int cc; 1882 struct termios *dt = (struct termios *)data; 1883 struct termios *lt = mynor & CALLOUT_MASK 1884 ? &com->lt_out : &com->lt_in; 1885 1886 dt->c_iflag = (tp->t_iflag & lt->c_iflag) 1887 | (dt->c_iflag & ~lt->c_iflag); 1888 dt->c_oflag = (tp->t_oflag & lt->c_oflag) 1889 | (dt->c_oflag & ~lt->c_oflag); 1890 dt->c_cflag = (tp->t_cflag & lt->c_cflag) 1891 | (dt->c_cflag & ~lt->c_cflag); 1892 dt->c_lflag = (tp->t_lflag & lt->c_lflag) 1893 | (dt->c_lflag & ~lt->c_lflag); 1894 for (cc = 0; cc < NCCS; ++cc) 1895 if (lt->c_cc[cc] != 0) 1896 dt->c_cc[cc] = tp->t_cc[cc]; 1897 if (lt->c_ispeed != 0) 1898 dt->c_ispeed = tp->t_ispeed; 1899 if (lt->c_ospeed != 0) 1900 dt->c_ospeed = tp->t_ospeed; 1901 } 1902 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 1903 if (error != ENOIOCTL) 1904 return (error); 1905 s = spltty(); 1906 error = ttioctl(tp, cmd, data, flag); 1907 disc_optim(tp, &tp->t_termios, com); 1908 if (error != ENOIOCTL) { 1909 splx(s); 1910 return (error); 1911 } 1912 switch (cmd) { 1913 case TIOCSBRK: 1914 outb(iobase + com_cfcr, com->cfcr_image |= CFCR_SBREAK); 1915 break; 1916 case TIOCCBRK: 1917 outb(iobase + com_cfcr, com->cfcr_image &= ~CFCR_SBREAK); 1918 break; 1919 case TIOCSDTR: 1920 (void)commctl(com, TIOCM_DTR, DMBIS); 1921 break; 1922 case TIOCCDTR: 1923 (void)commctl(com, TIOCM_DTR, DMBIC); 1924 break; 1925 /* 1926 * XXX should disallow changing MCR_RTS if CS_RTS_IFLOW is set. The 1927 * changes get undone on the next call to comparam(). 1928 */ 1929 case TIOCMSET: 1930 (void)commctl(com, *(int *)data, DMSET); 1931 break; 1932 case TIOCMBIS: 1933 (void)commctl(com, *(int *)data, DMBIS); 1934 break; 1935 case TIOCMBIC: 1936 (void)commctl(com, *(int *)data, DMBIC); 1937 break; 1938 case TIOCMGET: 1939 *(int *)data = commctl(com, 0, DMGET); 1940 break; 1941 case TIOCMSDTRWAIT: 1942 /* must be root since the wait applies to following logins */ 1943 error = suser(p); 1944 if (error != 0) { 1945 splx(s); 1946 return (error); 1947 } 1948 com->dtr_wait = *(int *)data * hz / 100; 1949 break; 1950 case TIOCMGDTRWAIT: 1951 *(int *)data = com->dtr_wait * 100 / hz; 1952 break; 1953 case TIOCTIMESTAMP: 1954 com->do_timestamp = TRUE; 1955 *(struct timeval *)data = com->timestamp; 1956 break; 1957 case TIOCDCDTIMESTAMP: 1958 com->do_dcd_timestamp = TRUE; 1959 *(struct timeval *)data = com->dcd_timestamp; 1960 break; 1961 default: 1962 splx(s); 1963 error = pps_ioctl(cmd, data, &com->pps); 1964 if (error == ENODEV) 1965 error = ENOTTY; 1966 return (error); 1967 } 1968 splx(s); 1969 return (0); 1970} 1971 1972static void 1973siopoll() 1974{ 1975 int unit; 1976 1977 if (com_events == 0) 1978 return; 1979repeat: 1980 for (unit = 0; unit < NSIOTOT; ++unit) { 1981 struct com_s *com; 1982 int incc; 1983 struct tty *tp; 1984 1985 com = com_addr(unit); 1986 if (com == NULL) 1987 continue; 1988 tp = com->tp; 1989 if (tp == NULL || com->gone) { 1990 /* 1991 * Discard any events related to never-opened or 1992 * going-away devices. 1993 */ 1994 disable_intr(); 1995 incc = com->iptr - com->ibuf; 1996 com->iptr = com->ibuf; 1997 if (com->state & CS_CHECKMSR) { 1998 incc += LOTS_OF_EVENTS; 1999 com->state &= ~CS_CHECKMSR; 2000 } 2001 com_events -= incc; 2002 enable_intr(); 2003 continue; 2004 } 2005 if (com->iptr != com->ibuf) { 2006 disable_intr(); 2007 sioinput(com); 2008 enable_intr(); 2009 } 2010 if (com->state & CS_CHECKMSR) { 2011 u_char delta_modem_status; 2012 2013 disable_intr(); 2014 delta_modem_status = com->last_modem_status 2015 ^ com->prev_modem_status; 2016 com->prev_modem_status = com->last_modem_status; 2017 com_events -= LOTS_OF_EVENTS; 2018 com->state &= ~CS_CHECKMSR; 2019 enable_intr(); 2020 if (delta_modem_status & MSR_DCD) 2021 (*linesw[tp->t_line].l_modem) 2022 (tp, com->prev_modem_status & MSR_DCD); 2023 } 2024 if (com->state & CS_ODONE) { 2025 disable_intr(); 2026 com_events -= LOTS_OF_EVENTS; 2027 com->state &= ~CS_ODONE; 2028 enable_intr(); 2029 if (!(com->state & CS_BUSY) 2030 && !(com->extra_state & CSE_BUSYCHECK)) { 2031 timeout(siobusycheck, com, hz / 100); 2032 com->extra_state |= CSE_BUSYCHECK; 2033 } 2034 (*linesw[tp->t_line].l_start)(tp); 2035 } 2036 if (com_events == 0) 2037 break; 2038 } 2039 if (com_events >= LOTS_OF_EVENTS) 2040 goto repeat; 2041} 2042 2043static int 2044comparam(tp, t) 2045 struct tty *tp; 2046 struct termios *t; 2047{ 2048 u_int cfcr; 2049 int cflag; 2050 struct com_s *com; 2051 int divisor; 2052 u_char dlbh; 2053 u_char dlbl; 2054 Port_t iobase; 2055 int s; 2056 int unit; 2057 2058 /* do historical conversions */ 2059 if (t->c_ispeed == 0) 2060 t->c_ispeed = t->c_ospeed; 2061 2062 /* check requested parameters */ 2063 divisor = ttspeedtab(t->c_ospeed, comspeedtab); 2064 if (divisor < 0 || (divisor > 0 && t->c_ispeed != t->c_ospeed)) 2065 return (EINVAL); 2066 2067 /* parameters are OK, convert them to the com struct and the device */ 2068 unit = DEV_TO_UNIT(tp->t_dev); 2069 com = com_addr(unit); 2070 iobase = com->iobase; 2071 s = spltty(); 2072 if (divisor == 0) 2073 (void)commctl(com, TIOCM_DTR, DMBIC); /* hang up line */ 2074 else 2075 (void)commctl(com, TIOCM_DTR, DMBIS); 2076 cflag = t->c_cflag; 2077 switch (cflag & CSIZE) { 2078 case CS5: 2079 cfcr = CFCR_5BITS; 2080 break; 2081 case CS6: 2082 cfcr = CFCR_6BITS; 2083 break; 2084 case CS7: 2085 cfcr = CFCR_7BITS; 2086 break; 2087 default: 2088 cfcr = CFCR_8BITS; 2089 break; 2090 } 2091 if (cflag & PARENB) { 2092 cfcr |= CFCR_PENAB; 2093 if (!(cflag & PARODD)) 2094 cfcr |= CFCR_PEVEN; 2095 } 2096 if (cflag & CSTOPB) 2097 cfcr |= CFCR_STOPB; 2098 2099 if (com->hasfifo && divisor != 0) { 2100 /* 2101 * Use a fifo trigger level low enough so that the input 2102 * latency from the fifo is less than about 16 msec and 2103 * the total latency is less than about 30 msec. These 2104 * latencies are reasonable for humans. Serial comms 2105 * protocols shouldn't expect anything better since modem 2106 * latencies are larger. 2107 */ 2108 com->fifo_image = t->c_ospeed <= 4800 2109 ? FIFO_ENABLE : FIFO_ENABLE | FIFO_RX_HIGH; 2110#ifdef COM_ESP 2111 /* 2112 * The Hayes ESP card needs the fifo DMA mode bit set 2113 * in compatibility mode. If not, it will interrupt 2114 * for each character received. 2115 */ 2116 if (com->esp) 2117 com->fifo_image |= FIFO_DMA_MODE; 2118#endif 2119 outb(iobase + com_fifo, com->fifo_image); 2120 } 2121 2122 /* 2123 * This returns with interrupts disabled so that we can complete 2124 * the speed change atomically. Keeping interrupts disabled is 2125 * especially important while com_data is hidden. 2126 */ 2127 (void) siosetwater(com, t->c_ispeed); 2128 2129 if (divisor != 0) { 2130 outb(iobase + com_cfcr, cfcr | CFCR_DLAB); 2131 /* 2132 * Only set the divisor registers if they would change, 2133 * since on some 16550 incompatibles (UMC8669F), setting 2134 * them while input is arriving them loses sync until 2135 * data stops arriving. 2136 */ 2137 dlbl = divisor & 0xFF; 2138 if (inb(iobase + com_dlbl) != dlbl) 2139 outb(iobase + com_dlbl, dlbl); 2140 dlbh = (u_int) divisor >> 8; 2141 if (inb(iobase + com_dlbh) != dlbh) 2142 outb(iobase + com_dlbh, dlbh); 2143 } 2144 2145 2146 outb(iobase + com_cfcr, com->cfcr_image = cfcr); 2147 2148 if (!(tp->t_state & TS_TTSTOP)) 2149 com->state |= CS_TTGO; 2150 2151 if (cflag & CRTS_IFLOW) { 2152 if (com->st16650a) { 2153 outb(iobase + com_cfcr, 0xbf); 2154 outb(iobase + com_fifo, inb(iobase + com_fifo) | 0x40); 2155 } 2156 com->state |= CS_RTS_IFLOW; 2157 /* 2158 * If CS_RTS_IFLOW just changed from off to on, the change 2159 * needs to be propagated to MCR_RTS. This isn't urgent, 2160 * so do it later by calling comstart() instead of repeating 2161 * a lot of code from comstart() here. 2162 */ 2163 } else if (com->state & CS_RTS_IFLOW) { 2164 com->state &= ~CS_RTS_IFLOW; 2165 /* 2166 * CS_RTS_IFLOW just changed from on to off. Force MCR_RTS 2167 * on here, since comstart() won't do it later. 2168 */ 2169 outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS); 2170 if (com->st16650a) { 2171 outb(iobase + com_cfcr, 0xbf); 2172 outb(iobase + com_fifo, inb(iobase + com_fifo) & ~0x40); 2173 } 2174 } 2175 2176 2177 /* 2178 * Set up state to handle output flow control. 2179 * XXX - worth handling MDMBUF (DCD) flow control at the lowest level? 2180 * Now has 10+ msec latency, while CTS flow has 50- usec latency. 2181 */ 2182 com->state |= CS_ODEVREADY; 2183 com->state &= ~CS_CTS_OFLOW; 2184 if (cflag & CCTS_OFLOW) { 2185 com->state |= CS_CTS_OFLOW; 2186 if (!(com->last_modem_status & MSR_CTS)) 2187 com->state &= ~CS_ODEVREADY; 2188 if (com->st16650a) { 2189 outb(iobase + com_cfcr, 0xbf); 2190 outb(iobase + com_fifo, inb(iobase + com_fifo) | 0x80); 2191 } 2192 } else { 2193 if (com->st16650a) { 2194 outb(iobase + com_cfcr, 0xbf); 2195 outb(iobase + com_fifo, inb(iobase + com_fifo) & ~0x80); 2196 } 2197 } 2198 2199 2200 outb(iobase + com_cfcr, com->cfcr_image); 2201 2202 2203 /* XXX shouldn't call functions while intrs are disabled. */ 2204 disc_optim(tp, t, com); 2205 /* 2206 * Recover from fiddling with CS_TTGO. We used to call siointr1() 2207 * unconditionally, but that defeated the careful discarding of 2208 * stale input in sioopen(). 2209 */ 2210 if (com->state >= (CS_BUSY | CS_TTGO)) 2211 siointr1(com); 2212 2213 enable_intr(); 2214 splx(s); 2215 comstart(tp); 2216 if (com->ibufold != NULL) { 2217 free(com->ibufold, M_DEVBUF); 2218 com->ibufold = NULL; 2219 } 2220 return (0); 2221} 2222 2223static int 2224siosetwater(com, speed) 2225 struct com_s *com; 2226 speed_t speed; 2227{ 2228 int cp4ticks; 2229 u_char *ibuf; 2230 int ibufsize; 2231 struct tty *tp; 2232 2233 /* 2234 * Make the buffer size large enough to handle a softtty interrupt 2235 * latency of about 2 ticks without loss of throughput or data 2236 * (about 3 ticks if input flow control is not used or not honoured, 2237 * but a bit less for CS5-CS7 modes). 2238 */ 2239 cp4ticks = speed / 10 / hz * 4; 2240 for (ibufsize = 128; ibufsize < cp4ticks;) 2241 ibufsize <<= 1; 2242 if (ibufsize == com->ibufsize) { 2243 disable_intr(); 2244 return (0); 2245 } 2246 2247 /* 2248 * Allocate input buffer. The extra factor of 2 in the size is 2249 * to allow for an error byte for each input byte. 2250 */ 2251 ibuf = malloc(2 * ibufsize, M_DEVBUF, M_NOWAIT); 2252 if (ibuf == NULL) { 2253 disable_intr(); 2254 return (ENOMEM); 2255 } 2256 2257 /* Initialize non-critical variables. */ 2258 com->ibufold = com->ibuf; 2259 com->ibufsize = ibufsize; 2260 tp = com->tp; 2261 if (tp != NULL) { 2262 tp->t_ififosize = 2 * ibufsize; 2263 tp->t_ispeedwat = (speed_t)-1; 2264 tp->t_ospeedwat = (speed_t)-1; 2265 } 2266 2267 /* 2268 * Read current input buffer, if any. Continue with interrupts 2269 * disabled. 2270 */ 2271 disable_intr(); 2272 if (com->iptr != com->ibuf) 2273 sioinput(com); 2274 2275 /*- 2276 * Initialize critical variables, including input buffer watermarks. 2277 * The external device is asked to stop sending when the buffer 2278 * exactly reaches high water, or when the high level requests it. 2279 * The high level is notified immediately (rather than at a later 2280 * clock tick) when this watermark is reached. 2281 * The buffer size is chosen so the watermark should almost never 2282 * be reached. 2283 * The low watermark is invisibly 0 since the buffer is always 2284 * emptied all at once. 2285 */ 2286 com->iptr = com->ibuf = ibuf; 2287 com->ibufend = ibuf + ibufsize; 2288 com->ierroff = ibufsize; 2289 com->ihighwater = ibuf + 3 * ibufsize / 4; 2290 return (0); 2291} 2292 2293static void 2294comstart(tp) 2295 struct tty *tp; 2296{ 2297 struct com_s *com; 2298 int s; 2299 int unit; 2300 2301 unit = DEV_TO_UNIT(tp->t_dev); 2302 com = com_addr(unit); 2303 s = spltty(); 2304 disable_intr(); 2305 if (tp->t_state & TS_TTSTOP) 2306 com->state &= ~CS_TTGO; 2307 else 2308 com->state |= CS_TTGO; 2309 if (tp->t_state & TS_TBLOCK) { 2310 if (com->mcr_image & MCR_RTS && com->state & CS_RTS_IFLOW) 2311 outb(com->modem_ctl_port, com->mcr_image &= ~MCR_RTS); 2312 } else { 2313 if (!(com->mcr_image & MCR_RTS) && com->iptr < com->ihighwater 2314 && com->state & CS_RTS_IFLOW) 2315 outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS); 2316 } 2317 enable_intr(); 2318 if (tp->t_state & (TS_TIMEOUT | TS_TTSTOP)) { 2319 ttwwakeup(tp); 2320 splx(s); 2321 return; 2322 } 2323 if (tp->t_outq.c_cc != 0) { 2324 struct lbq *qp; 2325 struct lbq *next; 2326 2327 if (!com->obufs[0].l_queued) { 2328 com->obufs[0].l_tail 2329 = com->obuf1 + q_to_b(&tp->t_outq, com->obuf1, 2330 sizeof com->obuf1); 2331 com->obufs[0].l_next = NULL; 2332 com->obufs[0].l_queued = TRUE; 2333 disable_intr(); 2334 if (com->state & CS_BUSY) { 2335 qp = com->obufq.l_next; 2336 while ((next = qp->l_next) != NULL) 2337 qp = next; 2338 qp->l_next = &com->obufs[0]; 2339 } else { 2340 com->obufq.l_head = com->obufs[0].l_head; 2341 com->obufq.l_tail = com->obufs[0].l_tail; 2342 com->obufq.l_next = &com->obufs[0]; 2343 com->state |= CS_BUSY; 2344 } 2345 enable_intr(); 2346 } 2347 if (tp->t_outq.c_cc != 0 && !com->obufs[1].l_queued) { 2348 com->obufs[1].l_tail 2349 = com->obuf2 + q_to_b(&tp->t_outq, com->obuf2, 2350 sizeof com->obuf2); 2351 com->obufs[1].l_next = NULL; 2352 com->obufs[1].l_queued = TRUE; 2353 disable_intr(); 2354 if (com->state & CS_BUSY) { 2355 qp = com->obufq.l_next; 2356 while ((next = qp->l_next) != NULL) 2357 qp = next; 2358 qp->l_next = &com->obufs[1]; 2359 } else { 2360 com->obufq.l_head = com->obufs[1].l_head; 2361 com->obufq.l_tail = com->obufs[1].l_tail; 2362 com->obufq.l_next = &com->obufs[1]; 2363 com->state |= CS_BUSY; 2364 } 2365 enable_intr(); 2366 } 2367 tp->t_state |= TS_BUSY; 2368 } 2369 disable_intr(); 2370 if (com->state >= (CS_BUSY | CS_TTGO)) 2371 siointr1(com); /* fake interrupt to start output */ 2372 enable_intr(); 2373 ttwwakeup(tp); 2374 splx(s); 2375} 2376 2377static void 2378siostop(tp, rw) 2379 struct tty *tp; 2380 int rw; 2381{ 2382 struct com_s *com; 2383 2384 com = com_addr(DEV_TO_UNIT(tp->t_dev)); 2385 if (com->gone) 2386 return; 2387 disable_intr(); 2388 if (rw & FWRITE) { 2389 if (com->hasfifo) 2390#ifdef COM_ESP 2391 /* XXX avoid h/w bug. */ 2392 if (!com->esp) 2393#endif 2394 outb(com->iobase + com_fifo, 2395 FIFO_XMT_RST | com->fifo_image); 2396 com->obufs[0].l_queued = FALSE; 2397 com->obufs[1].l_queued = FALSE; 2398 if (com->state & CS_ODONE) 2399 com_events -= LOTS_OF_EVENTS; 2400 com->state &= ~(CS_ODONE | CS_BUSY); 2401 com->tp->t_state &= ~TS_BUSY; 2402 } 2403 if (rw & FREAD) { 2404 if (com->hasfifo) 2405#ifdef COM_ESP 2406 /* XXX avoid h/w bug. */ 2407 if (!com->esp) 2408#endif 2409 outb(com->iobase + com_fifo, 2410 FIFO_RCV_RST | com->fifo_image); 2411 com_events -= (com->iptr - com->ibuf); 2412 com->iptr = com->ibuf; 2413 } 2414 enable_intr(); 2415 comstart(tp); 2416} 2417 2418static struct tty * 2419siodevtotty(dev) 2420 dev_t dev; 2421{ 2422 int mynor; 2423 int unit; 2424 2425 mynor = minor(dev); 2426 if (mynor & CONTROL_MASK) 2427 return (NULL); 2428 unit = MINOR_TO_UNIT(mynor); 2429 if ((u_int) unit >= NSIOTOT) 2430 return (NULL); 2431 return (dev->si_tty); 2432} 2433 2434static int 2435commctl(com, bits, how) 2436 struct com_s *com; 2437 int bits; 2438 int how; 2439{ 2440 int mcr; 2441 int msr; 2442 2443 if (how == DMGET) { 2444 bits = TIOCM_LE; /* XXX - always enabled while open */ 2445 mcr = com->mcr_image; 2446 if (mcr & MCR_DTR) 2447 bits |= TIOCM_DTR; 2448 if (mcr & MCR_RTS) 2449 bits |= TIOCM_RTS; 2450 msr = com->prev_modem_status; 2451 if (msr & MSR_CTS) 2452 bits |= TIOCM_CTS; 2453 if (msr & MSR_DCD) 2454 bits |= TIOCM_CD; 2455 if (msr & MSR_DSR) 2456 bits |= TIOCM_DSR; 2457 /* 2458 * XXX - MSR_RI is naturally volatile, and we make MSR_TERI 2459 * more volatile by reading the modem status a lot. Perhaps 2460 * we should latch both bits until the status is read here. 2461 */ 2462 if (msr & (MSR_RI | MSR_TERI)) 2463 bits |= TIOCM_RI; 2464 return (bits); 2465 } 2466 mcr = 0; 2467 if (bits & TIOCM_DTR) 2468 mcr |= MCR_DTR; 2469 if (bits & TIOCM_RTS) 2470 mcr |= MCR_RTS; 2471 if (com->gone) 2472 return(0); 2473 disable_intr(); 2474 switch (how) { 2475 case DMSET: 2476 outb(com->modem_ctl_port, 2477 com->mcr_image = mcr | (com->mcr_image & MCR_IENABLE)); 2478 break; 2479 case DMBIS: 2480 outb(com->modem_ctl_port, com->mcr_image |= mcr); 2481 break; 2482 case DMBIC: 2483 outb(com->modem_ctl_port, com->mcr_image &= ~mcr); 2484 break; 2485 } 2486 enable_intr(); 2487 return (0); 2488} 2489 2490static void 2491siosettimeout() 2492{ 2493 struct com_s *com; 2494 bool_t someopen; 2495 int unit; 2496 2497 /* 2498 * Set our timeout period to 1 second if no polled devices are open. 2499 * Otherwise set it to max(1/200, 1/hz). 2500 * Enable timeouts iff some device is open. 2501 */ 2502 untimeout(comwakeup, (void *)NULL, sio_timeout_handle); 2503 sio_timeout = hz; 2504 someopen = FALSE; 2505 for (unit = 0; unit < NSIOTOT; ++unit) { 2506 com = com_addr(unit); 2507 if (com != NULL && com->tp != NULL 2508 && com->tp->t_state & TS_ISOPEN && !com->gone) { 2509 someopen = TRUE; 2510 if (com->poll || com->poll_output) { 2511 sio_timeout = hz > 200 ? hz / 200 : 1; 2512 break; 2513 } 2514 } 2515 } 2516 if (someopen) { 2517 sio_timeouts_until_log = hz / sio_timeout; 2518 sio_timeout_handle = timeout(comwakeup, (void *)NULL, 2519 sio_timeout); 2520 } else { 2521 /* Flush error messages, if any. */ 2522 sio_timeouts_until_log = 1; 2523 comwakeup((void *)NULL); 2524 untimeout(comwakeup, (void *)NULL, sio_timeout_handle); 2525 } 2526} 2527 2528static void 2529comwakeup(chan) 2530 void *chan; 2531{ 2532 struct com_s *com; 2533 int unit; 2534 2535 sio_timeout_handle = timeout(comwakeup, (void *)NULL, sio_timeout); 2536 2537 /* 2538 * Recover from lost output interrupts. 2539 * Poll any lines that don't use interrupts. 2540 */ 2541 for (unit = 0; unit < NSIOTOT; ++unit) { 2542 com = com_addr(unit); 2543 if (com != NULL && !com->gone 2544 && (com->state >= (CS_BUSY | CS_TTGO) || com->poll)) { 2545 disable_intr(); 2546 siointr1(com); 2547 enable_intr(); 2548 } 2549 } 2550 2551 /* 2552 * Check for and log errors, but not too often. 2553 */ 2554 if (--sio_timeouts_until_log > 0) 2555 return; 2556 sio_timeouts_until_log = hz / sio_timeout; 2557 for (unit = 0; unit < NSIOTOT; ++unit) { 2558 int errnum; 2559 2560 com = com_addr(unit); 2561 if (com == NULL) 2562 continue; 2563 if (com->gone) 2564 continue; 2565 for (errnum = 0; errnum < CE_NTYPES; ++errnum) { 2566 u_int delta; 2567 u_long total; 2568 2569 disable_intr(); 2570 delta = com->delta_error_counts[errnum]; 2571 com->delta_error_counts[errnum] = 0; 2572 enable_intr(); 2573 if (delta == 0) 2574 continue; 2575 total = com->error_counts[errnum] += delta; 2576 log(LOG_ERR, "sio%d: %u more %s%s (total %lu)\n", 2577 unit, delta, error_desc[errnum], 2578 delta == 1 ? "" : "s", total); 2579 } 2580 } 2581} 2582 2583static void 2584disc_optim(tp, t, com) 2585 struct tty *tp; 2586 struct termios *t; 2587 struct com_s *com; 2588{ 2589 if (!(t->c_iflag & (ICRNL | IGNCR | IMAXBEL | INLCR | ISTRIP | IXON)) 2590 && (!(t->c_iflag & BRKINT) || (t->c_iflag & IGNBRK)) 2591 && (!(t->c_iflag & PARMRK) 2592 || (t->c_iflag & (IGNPAR | IGNBRK)) == (IGNPAR | IGNBRK)) 2593 && !(t->c_lflag & (ECHO | ICANON | IEXTEN | ISIG | PENDIN)) 2594 && linesw[tp->t_line].l_rint == ttyinput) 2595 tp->t_state |= TS_CAN_BYPASS_L_RINT; 2596 else 2597 tp->t_state &= ~TS_CAN_BYPASS_L_RINT; 2598 com->hotchar = linesw[tp->t_line].l_hotchar; 2599} 2600 2601/* 2602 * Following are all routines needed for SIO to act as console 2603 */ 2604#include <sys/cons.h> 2605 2606struct siocnstate { 2607 u_char dlbl; 2608 u_char dlbh; 2609 u_char ier; 2610 u_char cfcr; 2611 u_char mcr; 2612}; 2613 2614static speed_t siocngetspeed __P((Port_t, struct speedtab *)); 2615static void siocnclose __P((struct siocnstate *sp, Port_t iobase)); 2616static void siocnopen __P((struct siocnstate *sp, Port_t iobase, int speed)); 2617static void siocntxwait __P((Port_t iobase)); 2618 2619static cn_probe_t siocnprobe; 2620static cn_init_t siocninit; 2621static cn_checkc_t siocncheckc; 2622static cn_getc_t siocngetc; 2623static cn_putc_t siocnputc; 2624 2625#ifdef __i386__ 2626CONS_DRIVER(sio, siocnprobe, siocninit, NULL, siocngetc, siocncheckc, siocnputc); 2627 2628#endif 2629 2630/* To get the GDB related variables */ 2631#if DDB > 0 2632#include <ddb/ddb.h> 2633#endif 2634 2635static void 2636siocntxwait(iobase) 2637 Port_t iobase; 2638{ 2639 int timo; 2640 2641 /* 2642 * Wait for any pending transmission to finish. Required to avoid 2643 * the UART lockup bug when the speed is changed, and for normal 2644 * transmits. 2645 */ 2646 timo = 100000; 2647 while ((inb(iobase + com_lsr) & (LSR_TSRE | LSR_TXRDY)) 2648 != (LSR_TSRE | LSR_TXRDY) && --timo != 0) 2649 ; 2650} 2651 2652/* 2653 * Read the serial port specified and try to figure out what speed 2654 * it's currently running at. We're assuming the serial port has 2655 * been initialized and is basicly idle. This routine is only intended 2656 * to be run at system startup. 2657 * 2658 * If the value read from the serial port doesn't make sense, return 0. 2659 */ 2660 2661static speed_t 2662siocngetspeed(iobase, table) 2663 Port_t iobase; 2664 struct speedtab *table; 2665{ 2666 int code; 2667 u_char dlbh; 2668 u_char dlbl; 2669 u_char cfcr; 2670 2671 cfcr = inb(iobase + com_cfcr); 2672 outb(iobase + com_cfcr, CFCR_DLAB | cfcr); 2673 2674 dlbl = inb(iobase + com_dlbl); 2675 dlbh = inb(iobase + com_dlbh); 2676 2677 outb(iobase + com_cfcr, cfcr); 2678 2679 code = dlbh << 8 | dlbl; 2680 2681 for ( ; table->sp_speed != -1; table++) 2682 if (table->sp_code == code) 2683 return (table->sp_speed); 2684 2685 return 0; /* didn't match anything sane */ 2686} 2687 2688static void 2689siocnopen(sp, iobase, speed) 2690 struct siocnstate *sp; 2691 Port_t iobase; 2692 int speed; 2693{ 2694 int divisor; 2695 u_char dlbh; 2696 u_char dlbl; 2697 2698 /* 2699 * Save all the device control registers except the fifo register 2700 * and set our default ones (cs8 -parenb speed=comdefaultrate). 2701 * We can't save the fifo register since it is read-only. 2702 */ 2703 sp->ier = inb(iobase + com_ier); 2704 outb(iobase + com_ier, 0); /* spltty() doesn't stop siointr() */ 2705 siocntxwait(iobase); 2706 sp->cfcr = inb(iobase + com_cfcr); 2707 outb(iobase + com_cfcr, CFCR_DLAB | CFCR_8BITS); 2708 sp->dlbl = inb(iobase + com_dlbl); 2709 sp->dlbh = inb(iobase + com_dlbh); 2710 /* 2711 * Only set the divisor registers if they would change, since on 2712 * some 16550 incompatibles (Startech), setting them clears the 2713 * data input register. This also reduces the effects of the 2714 * UMC8669F bug. 2715 */ 2716 divisor = ttspeedtab(speed, comspeedtab); 2717 dlbl = divisor & 0xFF; 2718 if (sp->dlbl != dlbl) 2719 outb(iobase + com_dlbl, dlbl); 2720 dlbh = (u_int) divisor >> 8; 2721 if (sp->dlbh != dlbh) 2722 outb(iobase + com_dlbh, dlbh); 2723 outb(iobase + com_cfcr, CFCR_8BITS); 2724 sp->mcr = inb(iobase + com_mcr); 2725 /* 2726 * We don't want interrupts, but must be careful not to "disable" 2727 * them by clearing the MCR_IENABLE bit, since that might cause 2728 * an interrupt by floating the IRQ line. 2729 */ 2730 outb(iobase + com_mcr, (sp->mcr & MCR_IENABLE) | MCR_DTR | MCR_RTS); 2731} 2732 2733static void 2734siocnclose(sp, iobase) 2735 struct siocnstate *sp; 2736 Port_t iobase; 2737{ 2738 /* 2739 * Restore the device control registers. 2740 */ 2741 siocntxwait(iobase); 2742 outb(iobase + com_cfcr, CFCR_DLAB | CFCR_8BITS); 2743 if (sp->dlbl != inb(iobase + com_dlbl)) 2744 outb(iobase + com_dlbl, sp->dlbl); 2745 if (sp->dlbh != inb(iobase + com_dlbh)) 2746 outb(iobase + com_dlbh, sp->dlbh); 2747 outb(iobase + com_cfcr, sp->cfcr); 2748 /* 2749 * XXX damp oscillations of MCR_DTR and MCR_RTS by not restoring them. 2750 */ 2751 outb(iobase + com_mcr, sp->mcr | MCR_DTR | MCR_RTS); 2752 outb(iobase + com_ier, sp->ier); 2753} 2754 2755static void 2756siocnprobe(cp) 2757 struct consdev *cp; 2758{ 2759 speed_t boot_speed; 2760 u_char cfcr; 2761 int s, unit; 2762 struct siocnstate sp; 2763 2764 /* 2765 * Find our first enabled console, if any. If it is a high-level 2766 * console device, then initialize it and return successfully. 2767 * If it is a low-level console device, then initialize it and 2768 * return unsuccessfully. It must be initialized in both cases 2769 * for early use by console drivers and debuggers. Initializing 2770 * the hardware is not necessary in all cases, since the i/o 2771 * routines initialize it on the fly, but it is necessary if 2772 * input might arrive while the hardware is switched back to an 2773 * uninitialized state. We can't handle multiple console devices 2774 * yet because our low-level routines don't take a device arg. 2775 * We trust the user to set the console flags properly so that we 2776 * don't need to probe. 2777 */ 2778 cp->cn_pri = CN_DEAD; 2779 2780 for (unit = 0; unit < 16; unit++) { /* XXX need to know how many */ 2781 int flags; 2782 int disabled; 2783 if (resource_int_value("sio", unit, "disabled", &disabled) == 0) { 2784 if (disabled) 2785 continue; 2786 } 2787 if (resource_int_value("sio", unit, "flags", &flags)) 2788 continue; 2789 if (COM_CONSOLE(flags) || COM_DEBUGGER(flags)) { 2790 int port; 2791 Port_t iobase; 2792 2793 if (resource_int_value("sio", unit, "port", &port)) 2794 continue; 2795 iobase = port; 2796 s = spltty(); 2797 if (boothowto & RB_SERIAL) { 2798 boot_speed = siocngetspeed(iobase, comspeedtab); 2799 if (boot_speed) 2800 comdefaultrate = boot_speed; 2801 } 2802 2803 /* 2804 * Initialize the divisor latch. We can't rely on 2805 * siocnopen() to do this the first time, since it 2806 * avoids writing to the latch if the latch appears 2807 * to have the correct value. Also, if we didn't 2808 * just read the speed from the hardware, then we 2809 * need to set the speed in hardware so that 2810 * switching it later is null. 2811 */ 2812 cfcr = inb(iobase + com_cfcr); 2813 outb(iobase + com_cfcr, CFCR_DLAB | cfcr); 2814 outb(iobase + com_dlbl, 2815 COMBRD(comdefaultrate) & 0xff); 2816 outb(iobase + com_dlbh, 2817 (u_int) COMBRD(comdefaultrate) >> 8); 2818 outb(iobase + com_cfcr, cfcr); 2819 2820 siocnopen(&sp, iobase, comdefaultrate); 2821 2822 splx(s); 2823 if (COM_CONSOLE(flags) && !COM_LLCONSOLE(flags)) { 2824 cp->cn_dev = makedev(CDEV_MAJOR, unit); 2825 cp->cn_pri = COM_FORCECONSOLE(flags) 2826 || boothowto & RB_SERIAL 2827 ? CN_REMOTE : CN_NORMAL; 2828 siocniobase = iobase; 2829 siocnunit = unit; 2830 } 2831 if (COM_DEBUGGER(flags)) { 2832 printf("sio%d: gdb debugging port\n", unit); 2833 siogdbiobase = iobase; 2834 siogdbunit = unit; 2835#if DDB > 0 2836 gdbdev = makedev(CDEV_MAJOR, unit); 2837 gdb_getc = siocngetc; 2838 gdb_putc = siocnputc; 2839#endif 2840 } 2841 } 2842 } 2843#ifdef __i386__ 2844#if DDB > 0 2845 /* 2846 * XXX Ugly Compatability. 2847 * If no gdb port has been specified, set it to be the console 2848 * as some configuration files don't specify the gdb port. 2849 */ 2850 if (gdbdev == NODEV && (boothowto & RB_GDB)) { 2851 printf("Warning: no GDB port specified. Defaulting to sio%d.\n", 2852 siocnunit); 2853 printf("Set flag 0x80 on desired GDB port in your\n"); 2854 printf("configuration file (currently sio only).\n"); 2855 siogdbiobase = siocniobase; 2856 siogdbunit = siocnunit; 2857 gdbdev = makedev(CDEV_MAJOR, siocnunit); 2858 gdb_getc = siocngetc; 2859 gdb_putc = siocnputc; 2860 } 2861#endif 2862#endif 2863} 2864 2865#ifdef __alpha__ 2866 2867CONS_DRIVER(sio, NULL, NULL, NULL, siocngetc, siocncheckc, siocnputc); 2868 2869int 2870siocnattach(port, speed) 2871 int port; 2872 int speed; 2873{ 2874 int s; 2875 u_char cfcr; 2876 struct siocnstate sp; 2877 2878 siocniobase = port; 2879 comdefaultrate = speed; 2880 sio_consdev.cn_pri = CN_NORMAL; 2881 sio_consdev.cn_dev = makedev(CDEV_MAJOR, 0); 2882 2883 s = spltty(); 2884 2885 /* 2886 * Initialize the divisor latch. We can't rely on 2887 * siocnopen() to do this the first time, since it 2888 * avoids writing to the latch if the latch appears 2889 * to have the correct value. Also, if we didn't 2890 * just read the speed from the hardware, then we 2891 * need to set the speed in hardware so that 2892 * switching it later is null. 2893 */ 2894 cfcr = inb(siocniobase + com_cfcr); 2895 outb(siocniobase + com_cfcr, CFCR_DLAB | cfcr); 2896 outb(siocniobase + com_dlbl, 2897 COMBRD(comdefaultrate) & 0xff); 2898 outb(siocniobase + com_dlbh, 2899 (u_int) COMBRD(comdefaultrate) >> 8); 2900 outb(siocniobase + com_cfcr, cfcr); 2901 2902 siocnopen(&sp, siocniobase, comdefaultrate); 2903 splx(s); 2904 2905 cn_tab = &sio_consdev; 2906 return 0; 2907} 2908 2909int 2910siogdbattach(port, speed) 2911 int port; 2912 int speed; 2913{ 2914 int s; 2915 u_char cfcr; 2916 struct siocnstate sp; 2917 2918 siogdbiobase = port; 2919 gdbdefaultrate = speed; 2920 2921 s = spltty(); 2922 2923 /* 2924 * Initialize the divisor latch. We can't rely on 2925 * siocnopen() to do this the first time, since it 2926 * avoids writing to the latch if the latch appears 2927 * to have the correct value. Also, if we didn't 2928 * just read the speed from the hardware, then we 2929 * need to set the speed in hardware so that 2930 * switching it later is null. 2931 */ 2932 cfcr = inb(siogdbiobase + com_cfcr); 2933 outb(siogdbiobase + com_cfcr, CFCR_DLAB | cfcr); 2934 outb(siogdbiobase + com_dlbl, 2935 COMBRD(gdbdefaultrate) & 0xff); 2936 outb(siogdbiobase + com_dlbh, 2937 (u_int) COMBRD(gdbdefaultrate) >> 8); 2938 outb(siogdbiobase + com_cfcr, cfcr); 2939 2940 siocnopen(&sp, siogdbiobase, gdbdefaultrate); 2941 splx(s); 2942 2943 return 0; 2944} 2945 2946#endif 2947 2948static void 2949siocninit(cp) 2950 struct consdev *cp; 2951{ 2952 comconsole = DEV_TO_UNIT(cp->cn_dev); 2953} 2954 2955static int 2956siocncheckc(dev) 2957 dev_t dev; 2958{ 2959 int c; 2960 Port_t iobase; 2961 int s; 2962 struct siocnstate sp; 2963 2964 if (minor(dev) == siogdbunit) 2965 iobase = siogdbiobase; 2966 else 2967 iobase = siocniobase; 2968 s = spltty(); 2969 siocnopen(&sp, iobase, comdefaultrate); 2970 if (inb(iobase + com_lsr) & LSR_RXRDY) 2971 c = inb(iobase + com_data); 2972 else 2973 c = -1; 2974 siocnclose(&sp, iobase); 2975 splx(s); 2976 return (c); 2977} 2978 2979 2980int 2981siocngetc(dev) 2982 dev_t dev; 2983{ 2984 int c; 2985 Port_t iobase; 2986 int s; 2987 struct siocnstate sp; 2988 2989 if (minor(dev) == siogdbunit) 2990 iobase = siogdbiobase; 2991 else 2992 iobase = siocniobase; 2993 s = spltty(); 2994 siocnopen(&sp, iobase, comdefaultrate); 2995 while (!(inb(iobase + com_lsr) & LSR_RXRDY)) 2996 ; 2997 c = inb(iobase + com_data); 2998 siocnclose(&sp, iobase); 2999 splx(s); 3000 return (c); 3001} 3002 3003void 3004siocnputc(dev, c) 3005 dev_t dev; 3006 int c; 3007{ 3008 int s; 3009 struct siocnstate sp; 3010 Port_t iobase; 3011 3012 if (minor(dev) == siogdbunit) 3013 iobase = siogdbiobase; 3014 else 3015 iobase = siocniobase; 3016 s = spltty(); 3017 siocnopen(&sp, iobase, comdefaultrate); 3018 siocntxwait(iobase); 3019 outb(iobase + com_data, c); 3020 siocnclose(&sp, iobase); 3021 splx(s); 3022} 3023 3024#ifdef __alpha__ 3025int 3026siogdbgetc() 3027{ 3028 int c; 3029 Port_t iobase; 3030 int s; 3031 struct siocnstate sp; 3032 3033 iobase = siogdbiobase; 3034 s = spltty(); 3035 siocnopen(&sp, iobase, gdbdefaultrate); 3036 while (!(inb(iobase + com_lsr) & LSR_RXRDY)) 3037 ; 3038 c = inb(iobase + com_data); 3039 siocnclose(&sp, iobase); 3040 splx(s); 3041 return (c); 3042} 3043 3044void 3045siogdbputc(c) 3046 int c; 3047{ 3048 int s; 3049 struct siocnstate sp; 3050 3051 s = spltty(); 3052 siocnopen(&sp, siogdbiobase, gdbdefaultrate); 3053 siocntxwait(siogdbiobase); 3054 outb(siogdbiobase + com_data, c); 3055 siocnclose(&sp, siogdbiobase); 3056 splx(s); 3057} 3058#endif 3059 3060DEV_DRIVER_MODULE(sio, isa, sio_driver, sio_devclass, sio_cdevsw, 0, 0); 3061