sio.c revision 130585
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 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * from: @(#)com.c 7.5 (Berkeley) 5/16/91 30 * from: i386/isa sio.c,v 1.234 31 */ 32 33#include <sys/cdefs.h> 34__FBSDID("$FreeBSD: head/sys/dev/sio/sio.c 130585 2004-06-16 09:47:26Z phk $"); 35 36#include "opt_comconsole.h" 37#include "opt_compat.h" 38#include "opt_ddb.h" 39#include "opt_sio.h" 40 41/* 42 * Serial driver, based on 386BSD-0.1 com driver. 43 * Mostly rewritten to use pseudo-DMA. 44 * Works for National Semiconductor NS8250-NS16550AF UARTs. 45 * COM driver, based on HP dca driver. 46 * 47 * Changes for PC-Card integration: 48 * - Added PC-Card driver table and handlers 49 */ 50#include <sys/param.h> 51#include <sys/systm.h> 52#include <sys/bus.h> 53#include <sys/conf.h> 54#include <sys/fcntl.h> 55#include <sys/interrupt.h> 56#include <sys/kernel.h> 57#include <sys/limits.h> 58#include <sys/lock.h> 59#include <sys/malloc.h> 60#include <sys/module.h> 61#include <sys/mutex.h> 62#include <sys/proc.h> 63#include <sys/reboot.h> 64#include <sys/sysctl.h> 65#include <sys/syslog.h> 66#include <sys/tty.h> 67#include <machine/bus_pio.h> 68#include <machine/bus.h> 69#include <sys/rman.h> 70#include <sys/timepps.h> 71#include <sys/uio.h> 72#include <sys/cons.h> 73#if DDB > 0 74#include <ddb/ddb.h> 75#endif 76 77#include <isa/isavar.h> 78 79#include <machine/resource.h> 80 81#include <dev/sio/sioreg.h> 82#include <dev/sio/siovar.h> 83 84#ifdef COM_ESP 85#include <dev/ic/esp.h> 86#endif 87#include <dev/ic/ns16550.h> 88 89#define LOTS_OF_EVENTS 64 /* helps separate urgent events from input */ 90 91#define CALLOUT_MASK 0x80 92#define CONTROL_MASK 0x60 93#define CONTROL_INIT_STATE 0x20 94#define CONTROL_LOCK_STATE 0x40 95#define DEV_TO_UNIT(dev) (MINOR_TO_UNIT(minor(dev))) 96#define MINOR_TO_UNIT(mynor) ((((mynor) & ~0xffffU) >> (8 + 3)) \ 97 | ((mynor) & 0x1f)) 98#define UNIT_TO_MINOR(unit) ((((unit) & ~0x1fU) << (8 + 3)) \ 99 | ((unit) & 0x1f)) 100 101#ifdef COM_MULTIPORT 102/* checks in flags for multiport and which is multiport "master chip" 103 * for a given card 104 */ 105#define COM_ISMULTIPORT(flags) ((flags) & 0x01) 106#define COM_MPMASTER(flags) (((flags) >> 8) & 0x0ff) 107#define COM_NOTAST4(flags) ((flags) & 0x04) 108#else 109#define COM_ISMULTIPORT(flags) (0) 110#endif /* COM_MULTIPORT */ 111 112#define COM_C_IIR_TXRDYBUG 0x80000 113#define COM_CONSOLE(flags) ((flags) & 0x10) 114#define COM_DEBUGGER(flags) ((flags) & 0x80) 115#define COM_FIFOSIZE(flags) (((flags) & 0xff000000) >> 24) 116#define COM_FORCECONSOLE(flags) ((flags) & 0x20) 117#define COM_IIR_TXRDYBUG(flags) ((flags) & COM_C_IIR_TXRDYBUG) 118#define COM_LLCONSOLE(flags) ((flags) & 0x40) 119#define COM_LOSESOUTINTS(flags) ((flags) & 0x08) 120#define COM_NOFIFO(flags) ((flags) & 0x02) 121#define COM_NOPROBE(flags) ((flags) & 0x40000) 122#define COM_NOSCR(flags) ((flags) & 0x100000) 123#define COM_PPSCTS(flags) ((flags) & 0x10000) 124#define COM_ST16650A(flags) ((flags) & 0x20000) 125#define COM_TI16754(flags) ((flags) & 0x200000) 126 127#define sio_getreg(com, off) \ 128 (bus_space_read_1((com)->bst, (com)->bsh, (off))) 129#define sio_setreg(com, off, value) \ 130 (bus_space_write_1((com)->bst, (com)->bsh, (off), (value))) 131 132/* 133 * com state bits. 134 * (CS_BUSY | CS_TTGO) and (CS_BUSY | CS_TTGO | CS_ODEVREADY) must be higher 135 * than the other bits so that they can be tested as a group without masking 136 * off the low bits. 137 * 138 * The following com and tty flags correspond closely: 139 * CS_BUSY = TS_BUSY (maintained by comstart(), siopoll() and 140 * comstop()) 141 * CS_TTGO = ~TS_TTSTOP (maintained by comparam() and comstart()) 142 * CS_CTS_OFLOW = CCTS_OFLOW (maintained by comparam()) 143 * CS_RTS_IFLOW = CRTS_IFLOW (maintained by comparam()) 144 * TS_FLUSH is not used. 145 * XXX I think TIOCSETA doesn't clear TS_TTSTOP when it clears IXON. 146 * XXX CS_*FLOW should be CF_*FLOW in com->flags (control flags not state). 147 */ 148#define CS_BUSY 0x80 /* output in progress */ 149#define CS_TTGO 0x40 /* output not stopped by XOFF */ 150#define CS_ODEVREADY 0x20 /* external device h/w ready (CTS) */ 151#define CS_CHECKMSR 1 /* check of MSR scheduled */ 152#define CS_CTS_OFLOW 2 /* use CTS output flow control */ 153#define CS_DTR_OFF 0x10 /* DTR held off */ 154#define CS_ODONE 4 /* output completed */ 155#define CS_RTS_IFLOW 8 /* use RTS input flow control */ 156#define CSE_BUSYCHECK 1 /* siobusycheck() scheduled */ 157 158static char const * const error_desc[] = { 159#define CE_OVERRUN 0 160 "silo overflow", 161#define CE_INTERRUPT_BUF_OVERFLOW 1 162 "interrupt-level buffer overflow", 163#define CE_TTY_BUF_OVERFLOW 2 164 "tty-level buffer overflow", 165}; 166 167#define CE_NTYPES 3 168#define CE_RECORD(com, errnum) (++(com)->delta_error_counts[errnum]) 169 170/* types. XXX - should be elsewhere */ 171typedef u_int Port_t; /* hardware port */ 172typedef u_char bool_t; /* boolean */ 173 174/* queue of linear buffers */ 175struct lbq { 176 u_char *l_head; /* next char to process */ 177 u_char *l_tail; /* one past the last char to process */ 178 struct lbq *l_next; /* next in queue */ 179 bool_t l_queued; /* nonzero if queued */ 180}; 181 182/* com device structure */ 183struct com_s { 184 u_char state; /* miscellaneous flag bits */ 185 bool_t active_out; /* nonzero if the callout device is open */ 186 u_char cfcr_image; /* copy of value written to CFCR */ 187#ifdef COM_ESP 188 bool_t esp; /* is this unit a hayes esp board? */ 189#endif 190 u_char extra_state; /* more flag bits, separate for order trick */ 191 u_char fifo_image; /* copy of value written to FIFO */ 192 bool_t hasfifo; /* nonzero for 16550 UARTs */ 193 bool_t loses_outints; /* nonzero if device loses output interrupts */ 194 u_char mcr_image; /* copy of value written to MCR */ 195#ifdef COM_MULTIPORT 196 bool_t multiport; /* is this unit part of a multiport device? */ 197#endif /* COM_MULTIPORT */ 198 bool_t no_irq; /* nonzero if irq is not attached */ 199 bool_t gone; /* hardware disappeared */ 200 bool_t poll; /* nonzero if polling is required */ 201 bool_t poll_output; /* nonzero if polling for output is required */ 202 bool_t st16650a; /* nonzero if Startech 16650A compatible */ 203 int unit; /* unit number */ 204 int dtr_wait; /* time to hold DTR down on close (* 1/hz) */ 205 u_int flags; /* copy of device flags */ 206 u_int tx_fifo_size; 207 u_int wopeners; /* # processes waiting for DCD in open() */ 208 209 /* 210 * The high level of the driver never reads status registers directly 211 * because there would be too many side effects to handle conveniently. 212 * Instead, it reads copies of the registers stored here by the 213 * interrupt handler. 214 */ 215 u_char last_modem_status; /* last MSR read by intr handler */ 216 u_char prev_modem_status; /* last MSR handled by high level */ 217 218 u_char hotchar; /* ldisc-specific char to be handled ASAP */ 219 u_char *ibuf; /* start of input buffer */ 220 u_char *ibufend; /* end of input buffer */ 221 u_char *ibufold; /* old input buffer, to be freed */ 222 u_char *ihighwater; /* threshold in input buffer */ 223 u_char *iptr; /* next free spot in input buffer */ 224 int ibufsize; /* size of ibuf (not include error bytes) */ 225 int ierroff; /* offset of error bytes in ibuf */ 226 227 struct lbq obufq; /* head of queue of output buffers */ 228 struct lbq obufs[2]; /* output buffers */ 229 230 bus_space_tag_t bst; 231 bus_space_handle_t bsh; 232 233 Port_t data_port; /* i/o ports */ 234#ifdef COM_ESP 235 Port_t esp_port; 236#endif 237 Port_t int_ctl_port; 238 Port_t int_id_port; 239 Port_t modem_ctl_port; 240 Port_t line_status_port; 241 Port_t modem_status_port; 242 243 struct tty *tp; /* cross reference */ 244 245 /* Initial state. */ 246 struct termios it_in; /* should be in struct tty */ 247 struct termios it_out; 248 249 /* Lock state. */ 250 struct termios lt_in; /* should be in struct tty */ 251 struct termios lt_out; 252 253 bool_t do_timestamp; 254 bool_t do_dcd_timestamp; 255 struct timeval timestamp; 256 struct timeval dcd_timestamp; 257 struct pps_state pps; 258 int pps_bit; 259#ifdef ALT_BREAK_TO_DEBUGGER 260 int alt_brk_state; 261#endif 262 263 u_long bytes_in; /* statistics */ 264 u_long bytes_out; 265 u_int delta_error_counts[CE_NTYPES]; 266 u_long error_counts[CE_NTYPES]; 267 268 u_long rclk; 269 270 struct resource *irqres; 271 struct resource *ioportres; 272 int ioportrid; 273 void *cookie; 274 struct cdev *devs[6]; 275 276 /* 277 * Data area for output buffers. Someday we should build the output 278 * buffer queue without copying data. 279 */ 280 u_char obuf1[256]; 281 u_char obuf2[256]; 282}; 283 284#ifdef COM_ESP 285static int espattach(struct com_s *com, Port_t esp_port); 286#endif 287 288static timeout_t siobusycheck; 289static u_int siodivisor(u_long rclk, speed_t speed); 290static timeout_t siodtrwakeup; 291static void comhardclose(struct com_s *com); 292static void sioinput(struct com_s *com); 293static void siointr1(struct com_s *com); 294static void siointr(void *arg); 295static int commctl(struct com_s *com, int bits, int how); 296static int comparam(struct tty *tp, struct termios *t); 297static void siopoll(void *); 298static void siosettimeout(void); 299static int siosetwater(struct com_s *com, speed_t speed); 300static void comstart(struct tty *tp); 301static void comstop(struct tty *tp, int rw); 302static timeout_t comwakeup; 303 304char sio_driver_name[] = "sio"; 305static struct mtx sio_lock; 306static int sio_inited; 307 308/* table and macro for fast conversion from a unit number to its com struct */ 309devclass_t sio_devclass; 310#define com_addr(unit) ((struct com_s *) \ 311 devclass_get_softc(sio_devclass, unit)) /* XXX */ 312 313static d_open_t sioopen; 314static d_close_t sioclose; 315static d_read_t sioread; 316static d_write_t siowrite; 317static d_ioctl_t sioioctl; 318 319static struct cdevsw sio_cdevsw = { 320 .d_version = D_VERSION, 321 .d_open = sioopen, 322 .d_close = sioclose, 323 .d_read = sioread, 324 .d_write = siowrite, 325 .d_ioctl = sioioctl, 326 .d_name = sio_driver_name, 327 .d_flags = D_TTY | D_NEEDGIANT, 328}; 329 330int comconsole = -1; 331static volatile speed_t comdefaultrate = CONSPEED; 332static u_long comdefaultrclk = DEFAULT_RCLK; 333SYSCTL_ULONG(_machdep, OID_AUTO, conrclk, CTLFLAG_RW, &comdefaultrclk, 0, ""); 334static speed_t gdbdefaultrate = GDBSPEED; 335SYSCTL_UINT(_machdep, OID_AUTO, gdbspeed, CTLFLAG_RW, 336 &gdbdefaultrate, GDBSPEED, ""); 337static u_int com_events; /* input chars + weighted output completions */ 338static Port_t siocniobase; 339static int siocnunit = -1; 340static Port_t siogdbiobase; 341static int siogdbunit = -1; 342static void *sio_slow_ih; 343static void *sio_fast_ih; 344static int sio_timeout; 345static int sio_timeouts_until_log; 346static struct callout_handle sio_timeout_handle 347 = CALLOUT_HANDLE_INITIALIZER(&sio_timeout_handle); 348static int sio_numunits; 349 350#ifdef COM_ESP 351/* XXX configure this properly. */ 352/* XXX quite broken for new-bus. */ 353static Port_t likely_com_ports[] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8, }; 354static Port_t likely_esp_ports[] = { 0x140, 0x180, 0x280, 0 }; 355#endif 356 357/* 358 * handle sysctl read/write requests for console speed 359 * 360 * In addition to setting comdefaultrate for I/O through /dev/console, 361 * also set the initial and lock values for the /dev/ttyXX device 362 * if there is one associated with the console. Finally, if the /dev/tty 363 * device has already been open, change the speed on the open running port 364 * itself. 365 */ 366 367static int 368sysctl_machdep_comdefaultrate(SYSCTL_HANDLER_ARGS) 369{ 370 int error, s; 371 speed_t newspeed; 372 struct com_s *com; 373 struct tty *tp; 374 375 newspeed = comdefaultrate; 376 377 error = sysctl_handle_opaque(oidp, &newspeed, sizeof newspeed, req); 378 if (error || !req->newptr) 379 return (error); 380 381 comdefaultrate = newspeed; 382 383 if (comconsole < 0) /* serial console not selected? */ 384 return (0); 385 386 com = com_addr(comconsole); 387 if (com == NULL) 388 return (ENXIO); 389 390 /* 391 * set the initial and lock rates for /dev/ttydXX and /dev/cuaXX 392 * (note, the lock rates really are boolean -- if non-zero, disallow 393 * speed changes) 394 */ 395 com->it_in.c_ispeed = com->it_in.c_ospeed = 396 com->lt_in.c_ispeed = com->lt_in.c_ospeed = 397 com->it_out.c_ispeed = com->it_out.c_ospeed = 398 com->lt_out.c_ispeed = com->lt_out.c_ospeed = comdefaultrate; 399 400 /* 401 * if we're open, change the running rate too 402 */ 403 tp = com->tp; 404 if (tp && (tp->t_state & TS_ISOPEN)) { 405 tp->t_termios.c_ispeed = 406 tp->t_termios.c_ospeed = comdefaultrate; 407 s = spltty(); 408 error = comparam(tp, &tp->t_termios); 409 splx(s); 410 } 411 return error; 412} 413 414SYSCTL_PROC(_machdep, OID_AUTO, conspeed, CTLTYPE_INT | CTLFLAG_RW, 415 0, 0, sysctl_machdep_comdefaultrate, "I", ""); 416/* TUNABLE_INT("machdep.conspeed", &comdefaultrate); */ 417 418#define SET_FLAG(dev, bit) device_set_flags(dev, device_get_flags(dev) | (bit)) 419#define CLR_FLAG(dev, bit) device_set_flags(dev, device_get_flags(dev) & ~(bit)) 420 421/* 422 * Unload the driver and clear the table. 423 * XXX this is mostly wrong. 424 * XXX TODO: 425 * This is usually called when the card is ejected, but 426 * can be caused by a kldunload of a controller driver. 427 * The idea is to reset the driver's view of the device 428 * and ensure that any driver entry points such as 429 * read and write do not hang. 430 */ 431int 432siodetach(dev) 433 device_t dev; 434{ 435 struct com_s *com; 436 int i; 437 438 com = (struct com_s *) device_get_softc(dev); 439 if (com == NULL) { 440 device_printf(dev, "NULL com in siounload\n"); 441 return (0); 442 } 443 com->gone = TRUE; 444 for (i = 0 ; i < 6; i++) 445 destroy_dev(com->devs[i]); 446 if (com->irqres) { 447 bus_teardown_intr(dev, com->irqres, com->cookie); 448 bus_release_resource(dev, SYS_RES_IRQ, 0, com->irqres); 449 } 450 if (com->ioportres) 451 bus_release_resource(dev, SYS_RES_IOPORT, com->ioportrid, 452 com->ioportres); 453 if (com->tp && (com->tp->t_state & TS_ISOPEN)) { 454 device_printf(dev, "still open, forcing close\n"); 455 ttyld_close(com->tp, 0); 456 ttyclose(com->tp); 457 } else { 458 if (com->ibuf != NULL) 459 free(com->ibuf, M_DEVBUF); 460 device_set_softc(dev, NULL); 461 free(com, M_DEVBUF); 462 } 463 return (0); 464} 465 466int 467sioprobe(dev, xrid, rclk, noprobe) 468 device_t dev; 469 int xrid; 470 u_long rclk; 471 int noprobe; 472{ 473#if 0 474 static bool_t already_init; 475 device_t xdev; 476#endif 477 struct com_s *com; 478 u_int divisor; 479 bool_t failures[10]; 480 int fn; 481 device_t idev; 482 Port_t iobase; 483 intrmask_t irqmap[4]; 484 intrmask_t irqs; 485 u_char mcr_image; 486 int result; 487 u_long xirq; 488 u_int flags = device_get_flags(dev); 489 int rid; 490 struct resource *port; 491 492 rid = xrid; 493 port = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid, 494 0, ~0, IO_COMSIZE, RF_ACTIVE); 495 if (!port) 496 return (ENXIO); 497 498 com = malloc(sizeof(*com), M_DEVBUF, M_NOWAIT | M_ZERO); 499 if (com == NULL) { 500 bus_release_resource(dev, SYS_RES_IOPORT, rid, port); 501 return (ENOMEM); 502 } 503 device_set_softc(dev, com); 504 com->bst = rman_get_bustag(port); 505 com->bsh = rman_get_bushandle(port); 506 if (rclk == 0) 507 rclk = DEFAULT_RCLK; 508 com->rclk = rclk; 509 510 while (sio_inited != 2) 511 if (atomic_cmpset_int(&sio_inited, 0, 1)) { 512 mtx_init(&sio_lock, sio_driver_name, NULL, 513 (comconsole != -1) ? 514 MTX_SPIN | MTX_QUIET : MTX_SPIN); 515 atomic_store_rel_int(&sio_inited, 2); 516 } 517 518#if 0 519 /* 520 * XXX this is broken - when we are first called, there are no 521 * previously configured IO ports. We could hard code 522 * 0x3f8, 0x2f8, 0x3e8, 0x2e8 etc but that's probably worse. 523 * This code has been doing nothing since the conversion since 524 * "count" is zero the first time around. 525 */ 526 if (!already_init) { 527 /* 528 * Turn off MCR_IENABLE for all likely serial ports. An unused 529 * port with its MCR_IENABLE gate open will inhibit interrupts 530 * from any used port that shares the interrupt vector. 531 * XXX the gate enable is elsewhere for some multiports. 532 */ 533 device_t *devs; 534 int count, i, xioport; 535 536 devclass_get_devices(sio_devclass, &devs, &count); 537 for (i = 0; i < count; i++) { 538 xdev = devs[i]; 539 if (device_is_enabled(xdev) && 540 bus_get_resource(xdev, SYS_RES_IOPORT, 0, &xioport, 541 NULL) == 0) 542 outb(xioport + com_mcr, 0); 543 } 544 free(devs, M_TEMP); 545 already_init = TRUE; 546 } 547#endif 548 549 if (COM_LLCONSOLE(flags)) { 550 printf("sio%d: reserved for low-level i/o\n", 551 device_get_unit(dev)); 552 bus_release_resource(dev, SYS_RES_IOPORT, rid, port); 553 device_set_softc(dev, NULL); 554 free(com, M_DEVBUF); 555 return (ENXIO); 556 } 557 558 /* 559 * If the device is on a multiport card and has an AST/4 560 * compatible interrupt control register, initialize this 561 * register and prepare to leave MCR_IENABLE clear in the mcr. 562 * Otherwise, prepare to set MCR_IENABLE in the mcr. 563 * Point idev to the device struct giving the correct id_irq. 564 * This is the struct for the master device if there is one. 565 */ 566 idev = dev; 567 mcr_image = MCR_IENABLE; 568#ifdef COM_MULTIPORT 569 if (COM_ISMULTIPORT(flags)) { 570 Port_t xiobase; 571 u_long io; 572 573 idev = devclass_get_device(sio_devclass, COM_MPMASTER(flags)); 574 if (idev == NULL) { 575 printf("sio%d: master device %d not configured\n", 576 device_get_unit(dev), COM_MPMASTER(flags)); 577 idev = dev; 578 } 579 if (!COM_NOTAST4(flags)) { 580 if (bus_get_resource(idev, SYS_RES_IOPORT, 0, &io, 581 NULL) == 0) { 582 xiobase = io; 583 if (bus_get_resource(idev, SYS_RES_IRQ, 0, 584 NULL, NULL) == 0) 585 outb(xiobase + com_scr, 0x80); 586 else 587 outb(xiobase + com_scr, 0); 588 } 589 mcr_image = 0; 590 } 591 } 592#endif /* COM_MULTIPORT */ 593 if (bus_get_resource(idev, SYS_RES_IRQ, 0, NULL, NULL) != 0) 594 mcr_image = 0; 595 596 bzero(failures, sizeof failures); 597 iobase = rman_get_start(port); 598 599 /* 600 * We don't want to get actual interrupts, just masked ones. 601 * Interrupts from this line should already be masked in the ICU, 602 * but mask them in the processor as well in case there are some 603 * (misconfigured) shared interrupts. 604 */ 605 mtx_lock_spin(&sio_lock); 606/* EXTRA DELAY? */ 607 608 /* 609 * For the TI16754 chips, set prescaler to 1 (4 is often the 610 * default after-reset value) as otherwise it's impossible to 611 * get highest baudrates. 612 */ 613 if (COM_TI16754(flags)) { 614 u_char cfcr, efr; 615 616 cfcr = sio_getreg(com, com_cfcr); 617 sio_setreg(com, com_cfcr, CFCR_EFR_ENABLE); 618 efr = sio_getreg(com, com_efr); 619 /* Unlock extended features to turn off prescaler. */ 620 sio_setreg(com, com_efr, efr | EFR_EFE); 621 /* Disable EFR. */ 622 sio_setreg(com, com_cfcr, (cfcr != CFCR_EFR_ENABLE) ? cfcr : 0); 623 /* Turn off prescaler. */ 624 sio_setreg(com, com_mcr, 625 sio_getreg(com, com_mcr) & ~MCR_PRESCALE); 626 sio_setreg(com, com_cfcr, CFCR_EFR_ENABLE); 627 sio_setreg(com, com_efr, efr); 628 sio_setreg(com, com_cfcr, cfcr); 629 } 630 631 /* 632 * Initialize the speed and the word size and wait long enough to 633 * drain the maximum of 16 bytes of junk in device output queues. 634 * The speed is undefined after a master reset and must be set 635 * before relying on anything related to output. There may be 636 * junk after a (very fast) soft reboot and (apparently) after 637 * master reset. 638 * XXX what about the UART bug avoided by waiting in comparam()? 639 * We don't want to to wait long enough to drain at 2 bps. 640 */ 641 if (iobase == siocniobase) 642 DELAY((16 + 1) * 1000000 / (comdefaultrate / 10)); 643 else { 644 sio_setreg(com, com_cfcr, CFCR_DLAB | CFCR_8BITS); 645 divisor = siodivisor(rclk, SIO_TEST_SPEED); 646 sio_setreg(com, com_dlbl, divisor & 0xff); 647 sio_setreg(com, com_dlbh, divisor >> 8); 648 sio_setreg(com, com_cfcr, CFCR_8BITS); 649 DELAY((16 + 1) * 1000000 / (SIO_TEST_SPEED / 10)); 650 } 651 652 /* 653 * Enable the interrupt gate and disable device interupts. This 654 * should leave the device driving the interrupt line low and 655 * guarantee an edge trigger if an interrupt can be generated. 656 */ 657/* EXTRA DELAY? */ 658 sio_setreg(com, com_mcr, mcr_image); 659 sio_setreg(com, com_ier, 0); 660 DELAY(1000); /* XXX */ 661 irqmap[0] = isa_irq_pending(); 662 663 /* 664 * Attempt to set loopback mode so that we can send a null byte 665 * without annoying any external device. 666 */ 667/* EXTRA DELAY? */ 668 sio_setreg(com, com_mcr, mcr_image | MCR_LOOPBACK); 669 670 /* 671 * Attempt to generate an output interrupt. On 8250's, setting 672 * IER_ETXRDY generates an interrupt independent of the current 673 * setting and independent of whether the THR is empty. On 16450's, 674 * setting IER_ETXRDY generates an interrupt independent of the 675 * current setting. On 16550A's, setting IER_ETXRDY only 676 * generates an interrupt when IER_ETXRDY is not already set. 677 */ 678 sio_setreg(com, com_ier, IER_ETXRDY); 679 680 /* 681 * On some 16x50 incompatibles, setting IER_ETXRDY doesn't generate 682 * an interrupt. They'd better generate one for actually doing 683 * output. Loopback may be broken on the same incompatibles but 684 * it's unlikely to do more than allow the null byte out. 685 */ 686 sio_setreg(com, com_data, 0); 687 if (iobase == siocniobase) 688 DELAY((1 + 2) * 1000000 / (comdefaultrate / 10)); 689 else 690 DELAY((1 + 2) * 1000000 / (SIO_TEST_SPEED / 10)); 691 692 /* 693 * Turn off loopback mode so that the interrupt gate works again 694 * (MCR_IENABLE was hidden). This should leave the device driving 695 * an interrupt line high. It doesn't matter if the interrupt 696 * line oscillates while we are not looking at it, since interrupts 697 * are disabled. 698 */ 699/* EXTRA DELAY? */ 700 sio_setreg(com, com_mcr, mcr_image); 701 702 /* 703 * It seems my Xircom CBEM56G Cardbus modem wants to be reset 704 * to 8 bits *again*, or else probe test 0 will fail. 705 * gwk@sgi.com, 4/19/2001 706 */ 707 sio_setreg(com, com_cfcr, CFCR_8BITS); 708 709 /* 710 * Some PCMCIA cards (Palido 321s, DC-1S, ...) have the "TXRDY bug", 711 * so we probe for a buggy IIR_TXRDY implementation even in the 712 * noprobe case. We don't probe for it in the !noprobe case because 713 * noprobe is always set for PCMCIA cards and the problem is not 714 * known to affect any other cards. 715 */ 716 if (noprobe) { 717 /* Read IIR a few times. */ 718 for (fn = 0; fn < 2; fn ++) { 719 DELAY(10000); 720 failures[6] = sio_getreg(com, com_iir); 721 } 722 723 /* IIR_TXRDY should be clear. Is it? */ 724 result = 0; 725 if (failures[6] & IIR_TXRDY) { 726 /* 727 * No. We seem to have the bug. Does our fix for 728 * it work? 729 */ 730 sio_setreg(com, com_ier, 0); 731 if (sio_getreg(com, com_iir) & IIR_NOPEND) { 732 /* Yes. We discovered the TXRDY bug! */ 733 SET_FLAG(dev, COM_C_IIR_TXRDYBUG); 734 } else { 735 /* No. Just fail. XXX */ 736 result = ENXIO; 737 sio_setreg(com, com_mcr, 0); 738 } 739 } else { 740 /* Yes. No bug. */ 741 CLR_FLAG(dev, COM_C_IIR_TXRDYBUG); 742 } 743 sio_setreg(com, com_ier, 0); 744 sio_setreg(com, com_cfcr, CFCR_8BITS); 745 mtx_unlock_spin(&sio_lock); 746 bus_release_resource(dev, SYS_RES_IOPORT, rid, port); 747 if (iobase == siocniobase) 748 result = 0; 749 if (result != 0) { 750 device_set_softc(dev, NULL); 751 free(com, M_DEVBUF); 752 } 753 return (result); 754 } 755 756 /* 757 * Check that 758 * o the CFCR, IER and MCR in UART hold the values written to them 759 * (the values happen to be all distinct - this is good for 760 * avoiding false positive tests from bus echoes). 761 * o an output interrupt is generated and its vector is correct. 762 * o the interrupt goes away when the IIR in the UART is read. 763 */ 764/* EXTRA DELAY? */ 765 failures[0] = sio_getreg(com, com_cfcr) - CFCR_8BITS; 766 failures[1] = sio_getreg(com, com_ier) - IER_ETXRDY; 767 failures[2] = sio_getreg(com, com_mcr) - mcr_image; 768 DELAY(10000); /* Some internal modems need this time */ 769 irqmap[1] = isa_irq_pending(); 770 failures[4] = (sio_getreg(com, com_iir) & IIR_IMASK) - IIR_TXRDY; 771 DELAY(1000); /* XXX */ 772 irqmap[2] = isa_irq_pending(); 773 failures[6] = (sio_getreg(com, com_iir) & IIR_IMASK) - IIR_NOPEND; 774 775 /* 776 * Turn off all device interrupts and check that they go off properly. 777 * Leave MCR_IENABLE alone. For ports without a master port, it gates 778 * the OUT2 output of the UART to 779 * the ICU input. Closing the gate would give a floating ICU input 780 * (unless there is another device driving it) and spurious interrupts. 781 * (On the system that this was first tested on, the input floats high 782 * and gives a (masked) interrupt as soon as the gate is closed.) 783 */ 784 sio_setreg(com, com_ier, 0); 785 sio_setreg(com, com_cfcr, CFCR_8BITS); /* dummy to avoid bus echo */ 786 failures[7] = sio_getreg(com, com_ier); 787 DELAY(1000); /* XXX */ 788 irqmap[3] = isa_irq_pending(); 789 failures[9] = (sio_getreg(com, com_iir) & IIR_IMASK) - IIR_NOPEND; 790 791 mtx_unlock_spin(&sio_lock); 792 793 irqs = irqmap[1] & ~irqmap[0]; 794 if (bus_get_resource(idev, SYS_RES_IRQ, 0, &xirq, NULL) == 0 && 795 ((1 << xirq) & irqs) == 0) { 796 printf( 797 "sio%d: configured irq %ld not in bitmap of probed irqs %#x\n", 798 device_get_unit(dev), xirq, irqs); 799 printf( 800 "sio%d: port may not be enabled\n", 801 device_get_unit(dev)); 802 } 803 if (bootverbose) 804 printf("sio%d: irq maps: %#x %#x %#x %#x\n", 805 device_get_unit(dev), 806 irqmap[0], irqmap[1], irqmap[2], irqmap[3]); 807 808 result = 0; 809 for (fn = 0; fn < sizeof failures; ++fn) 810 if (failures[fn]) { 811 sio_setreg(com, com_mcr, 0); 812 result = ENXIO; 813 if (bootverbose) { 814 printf("sio%d: probe failed test(s):", 815 device_get_unit(dev)); 816 for (fn = 0; fn < sizeof failures; ++fn) 817 if (failures[fn]) 818 printf(" %d", fn); 819 printf("\n"); 820 } 821 break; 822 } 823 bus_release_resource(dev, SYS_RES_IOPORT, rid, port); 824 if (iobase == siocniobase) 825 result = 0; 826 if (result != 0) { 827 device_set_softc(dev, NULL); 828 free(com, M_DEVBUF); 829 } 830 return (result); 831} 832 833#ifdef COM_ESP 834static int 835espattach(com, esp_port) 836 struct com_s *com; 837 Port_t esp_port; 838{ 839 u_char dips; 840 u_char val; 841 842 /* 843 * Check the ESP-specific I/O port to see if we're an ESP 844 * card. If not, return failure immediately. 845 */ 846 if ((inb(esp_port) & 0xf3) == 0) { 847 printf(" port 0x%x is not an ESP board?\n", esp_port); 848 return (0); 849 } 850 851 /* 852 * We've got something that claims to be a Hayes ESP card. 853 * Let's hope so. 854 */ 855 856 /* Get the dip-switch configuration */ 857 outb(esp_port + ESP_CMD1, ESP_GETDIPS); 858 dips = inb(esp_port + ESP_STATUS1); 859 860 /* 861 * Bits 0,1 of dips say which COM port we are. 862 */ 863 if (rman_get_start(com->ioportres) == likely_com_ports[dips & 0x03]) 864 printf(" : ESP"); 865 else { 866 printf(" esp_port has com %d\n", dips & 0x03); 867 return (0); 868 } 869 870 /* 871 * Check for ESP version 2.0 or later: bits 4,5,6 = 010. 872 */ 873 outb(esp_port + ESP_CMD1, ESP_GETTEST); 874 val = inb(esp_port + ESP_STATUS1); /* clear reg 1 */ 875 val = inb(esp_port + ESP_STATUS2); 876 if ((val & 0x70) < 0x20) { 877 printf("-old (%o)", val & 0x70); 878 return (0); 879 } 880 881 /* 882 * Check for ability to emulate 16550: bit 7 == 1 883 */ 884 if ((dips & 0x80) == 0) { 885 printf(" slave"); 886 return (0); 887 } 888 889 /* 890 * Okay, we seem to be a Hayes ESP card. Whee. 891 */ 892 com->esp = TRUE; 893 com->esp_port = esp_port; 894 return (1); 895} 896#endif /* COM_ESP */ 897 898int 899sioattach(dev, xrid, rclk) 900 device_t dev; 901 int xrid; 902 u_long rclk; 903{ 904 struct com_s *com; 905#ifdef COM_ESP 906 Port_t *espp; 907#endif 908 Port_t iobase; 909 int minorbase; 910 int unit; 911 u_int flags; 912 int rid; 913 struct resource *port; 914 int ret; 915 916 rid = xrid; 917 port = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid, 918 0, ~0, IO_COMSIZE, RF_ACTIVE); 919 if (!port) 920 return (ENXIO); 921 922 iobase = rman_get_start(port); 923 unit = device_get_unit(dev); 924 com = device_get_softc(dev); 925 flags = device_get_flags(dev); 926 927 if (unit >= sio_numunits) 928 sio_numunits = unit + 1; 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->ioportrid = rid; 945 com->bst = rman_get_bustag(port); 946 com->bsh = rman_get_bushandle(port); 947 com->cfcr_image = CFCR_8BITS; 948 com->dtr_wait = 3 * hz; 949 com->loses_outints = COM_LOSESOUTINTS(flags) != 0; 950 com->no_irq = bus_get_resource(dev, SYS_RES_IRQ, 0, NULL, NULL) != 0; 951 com->tx_fifo_size = 1; 952 com->obufs[0].l_head = com->obuf1; 953 com->obufs[1].l_head = com->obuf2; 954 955 com->data_port = iobase + com_data; 956 com->int_ctl_port = iobase + com_ier; 957 com->int_id_port = iobase + com_iir; 958 com->modem_ctl_port = iobase + com_mcr; 959 com->mcr_image = inb(com->modem_ctl_port); 960 com->line_status_port = iobase + com_lsr; 961 com->modem_status_port = iobase + com_msr; 962 963 if (rclk == 0) 964 rclk = DEFAULT_RCLK; 965 com->rclk = rclk; 966 967 /* 968 * We don't use all the flags from <sys/ttydefaults.h> since they 969 * are only relevant for logins. It's important to have echo off 970 * initially so that the line doesn't start blathering before the 971 * echo flag can be turned off. 972 */ 973 com->it_in.c_iflag = 0; 974 com->it_in.c_oflag = 0; 975 com->it_in.c_cflag = TTYDEF_CFLAG; 976 com->it_in.c_lflag = 0; 977 if (unit == comconsole) { 978 com->it_in.c_iflag = TTYDEF_IFLAG; 979 com->it_in.c_oflag = TTYDEF_OFLAG; 980 com->it_in.c_cflag = TTYDEF_CFLAG | CLOCAL; 981 com->it_in.c_lflag = TTYDEF_LFLAG; 982 com->lt_out.c_cflag = com->lt_in.c_cflag = CLOCAL; 983 com->lt_out.c_ispeed = com->lt_out.c_ospeed = 984 com->lt_in.c_ispeed = com->lt_in.c_ospeed = 985 com->it_in.c_ispeed = com->it_in.c_ospeed = comdefaultrate; 986 } else 987 com->it_in.c_ispeed = com->it_in.c_ospeed = TTYDEF_SPEED; 988 if (siosetwater(com, com->it_in.c_ispeed) != 0) { 989 mtx_unlock_spin(&sio_lock); 990 /* 991 * Leave i/o resources allocated if this is a `cn'-level 992 * console, so that other devices can't snarf them. 993 */ 994 if (iobase != siocniobase) 995 bus_release_resource(dev, SYS_RES_IOPORT, rid, port); 996 return (ENOMEM); 997 } 998 mtx_unlock_spin(&sio_lock); 999 termioschars(&com->it_in); 1000 com->it_out = com->it_in; 1001 1002 /* attempt to determine UART type */ 1003 printf("sio%d: type", unit); 1004 1005 1006 if (!COM_ISMULTIPORT(flags) && 1007 !COM_IIR_TXRDYBUG(flags) && !COM_NOSCR(flags)) { 1008 u_char scr; 1009 u_char scr1; 1010 u_char scr2; 1011 1012 scr = sio_getreg(com, com_scr); 1013 sio_setreg(com, com_scr, 0xa5); 1014 scr1 = sio_getreg(com, com_scr); 1015 sio_setreg(com, com_scr, 0x5a); 1016 scr2 = sio_getreg(com, com_scr); 1017 sio_setreg(com, com_scr, scr); 1018 if (scr1 != 0xa5 || scr2 != 0x5a) { 1019 printf(" 8250 or not responding"); 1020 goto determined_type; 1021 } 1022 } 1023 sio_setreg(com, com_fifo, FIFO_ENABLE | FIFO_RX_HIGH); 1024 DELAY(100); 1025 switch (inb(com->int_id_port) & IIR_FIFO_MASK) { 1026 case FIFO_RX_LOW: 1027 printf(" 16450"); 1028 break; 1029 case FIFO_RX_MEDL: 1030 printf(" 16450?"); 1031 break; 1032 case FIFO_RX_MEDH: 1033 printf(" 16550?"); 1034 break; 1035 case FIFO_RX_HIGH: 1036 if (COM_NOFIFO(flags)) { 1037 printf(" 16550A fifo disabled"); 1038 break; 1039 } 1040 com->hasfifo = TRUE; 1041 if (COM_ST16650A(flags)) { 1042 printf(" ST16650A"); 1043 com->st16650a = TRUE; 1044 com->tx_fifo_size = 32; 1045 break; 1046 } 1047 if (COM_TI16754(flags)) { 1048 printf(" TI16754"); 1049 com->tx_fifo_size = 64; 1050 break; 1051 } 1052 printf(" 16550A"); 1053#ifdef COM_ESP 1054 for (espp = likely_esp_ports; *espp != 0; espp++) 1055 if (espattach(com, *espp)) { 1056 com->tx_fifo_size = 1024; 1057 break; 1058 } 1059 if (com->esp) 1060 break; 1061#endif 1062 com->tx_fifo_size = COM_FIFOSIZE(flags); 1063 if (com->tx_fifo_size == 0) 1064 com->tx_fifo_size = 16; 1065 else 1066 printf(" lookalike with %u bytes FIFO", 1067 com->tx_fifo_size); 1068 break; 1069 } 1070#ifdef COM_ESP 1071 if (com->esp) { 1072 /* 1073 * Set 16550 compatibility mode. 1074 * We don't use the ESP_MODE_SCALE bit to increase the 1075 * fifo trigger levels because we can't handle large 1076 * bursts of input. 1077 * XXX flow control should be set in comparam(), not here. 1078 */ 1079 outb(com->esp_port + ESP_CMD1, ESP_SETMODE); 1080 outb(com->esp_port + ESP_CMD2, ESP_MODE_RTS | ESP_MODE_FIFO); 1081 1082 /* Set RTS/CTS flow control. */ 1083 outb(com->esp_port + ESP_CMD1, ESP_SETFLOWTYPE); 1084 outb(com->esp_port + ESP_CMD2, ESP_FLOW_RTS); 1085 outb(com->esp_port + ESP_CMD2, ESP_FLOW_CTS); 1086 1087 /* Set flow-control levels. */ 1088 outb(com->esp_port + ESP_CMD1, ESP_SETRXFLOW); 1089 outb(com->esp_port + ESP_CMD2, HIBYTE(768)); 1090 outb(com->esp_port + ESP_CMD2, LOBYTE(768)); 1091 outb(com->esp_port + ESP_CMD2, HIBYTE(512)); 1092 outb(com->esp_port + ESP_CMD2, LOBYTE(512)); 1093 } 1094#endif /* COM_ESP */ 1095 sio_setreg(com, com_fifo, 0); 1096determined_type: ; 1097 1098#ifdef COM_MULTIPORT 1099 if (COM_ISMULTIPORT(flags)) { 1100 device_t masterdev; 1101 1102 com->multiport = TRUE; 1103 printf(" (multiport"); 1104 if (unit == COM_MPMASTER(flags)) 1105 printf(" master"); 1106 printf(")"); 1107 masterdev = devclass_get_device(sio_devclass, 1108 COM_MPMASTER(flags)); 1109 com->no_irq = (masterdev == NULL || bus_get_resource(masterdev, 1110 SYS_RES_IRQ, 0, NULL, NULL) != 0); 1111 } 1112#endif /* COM_MULTIPORT */ 1113 if (unit == comconsole) 1114 printf(", console"); 1115 if (COM_IIR_TXRDYBUG(flags)) 1116 printf(" with a buggy IIR_TXRDY implementation"); 1117 printf("\n"); 1118 1119 if (sio_fast_ih == NULL) { 1120 swi_add(&tty_ithd, "tty:sio", siopoll, NULL, SWI_TTY, 0, 1121 &sio_fast_ih); 1122 swi_add(&clk_ithd, "tty:sio", siopoll, NULL, SWI_TTY, 0, 1123 &sio_slow_ih); 1124 } 1125 minorbase = UNIT_TO_MINOR(unit); 1126 com->devs[0] = make_dev(&sio_cdevsw, minorbase, 1127 UID_ROOT, GID_WHEEL, 0600, "ttyd%r", unit); 1128 com->devs[1] = make_dev(&sio_cdevsw, minorbase | CONTROL_INIT_STATE, 1129 UID_ROOT, GID_WHEEL, 0600, "ttyid%r", unit); 1130 com->devs[2] = make_dev(&sio_cdevsw, minorbase | CONTROL_LOCK_STATE, 1131 UID_ROOT, GID_WHEEL, 0600, "ttyld%r", unit); 1132 com->devs[3] = make_dev(&sio_cdevsw, minorbase | CALLOUT_MASK, 1133 UID_UUCP, GID_DIALER, 0660, "cuaa%r", unit); 1134 com->devs[4] = make_dev(&sio_cdevsw, 1135 minorbase | CALLOUT_MASK | CONTROL_INIT_STATE, 1136 UID_UUCP, GID_DIALER, 0660, "cuaia%r", unit); 1137 com->devs[5] = make_dev(&sio_cdevsw, 1138 minorbase | CALLOUT_MASK | CONTROL_LOCK_STATE, 1139 UID_UUCP, GID_DIALER, 0660, "cuala%r", unit); 1140 for (rid = 0; rid < 6; rid++) 1141 com->devs[rid]->si_drv1 = com; 1142 com->flags = flags; 1143 com->pps.ppscap = PPS_CAPTUREASSERT | PPS_CAPTURECLEAR; 1144 1145 if (COM_PPSCTS(flags)) 1146 com->pps_bit = MSR_CTS; 1147 else 1148 com->pps_bit = MSR_DCD; 1149 pps_init(&com->pps); 1150 1151 rid = 0; 1152 com->irqres = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, RF_ACTIVE); 1153 if (com->irqres) { 1154 ret = BUS_SETUP_INTR(device_get_parent(dev), dev, com->irqres, 1155 INTR_TYPE_TTY | INTR_FAST, 1156 siointr, com, &com->cookie); 1157 if (ret) { 1158 ret = BUS_SETUP_INTR(device_get_parent(dev), dev, 1159 com->irqres, INTR_TYPE_TTY, 1160 siointr, com, &com->cookie); 1161 if (ret == 0) 1162 device_printf(dev, "unable to activate interrupt in fast mode - using normal mode\n"); 1163 } 1164 if (ret) 1165 device_printf(dev, "could not activate interrupt\n"); 1166#if defined(DDB) && (defined(BREAK_TO_DEBUGGER) || \ 1167 defined(ALT_BREAK_TO_DEBUGGER)) 1168 /* 1169 * Enable interrupts for early break-to-debugger support 1170 * on the console. 1171 */ 1172 if (ret == 0 && unit == comconsole) 1173 outb(siocniobase + com_ier, IER_ERXRDY | IER_ERLS | 1174 IER_EMSC); 1175#endif 1176 } 1177 1178 return (0); 1179} 1180 1181static int 1182sioopen(dev, flag, mode, td) 1183 struct cdev *dev; 1184 int flag; 1185 int mode; 1186 struct thread *td; 1187{ 1188 struct com_s *com; 1189 int error; 1190 int mynor; 1191 int s; 1192 struct tty *tp; 1193 int unit; 1194 1195 mynor = minor(dev); 1196 unit = MINOR_TO_UNIT(mynor); 1197 com = com_addr(unit); 1198 if (com == NULL) 1199 return (ENXIO); 1200 if (com->gone) 1201 return (ENXIO); 1202 if (mynor & CONTROL_MASK) 1203 return (0); 1204 tp = dev->si_tty = com->tp = ttymalloc(com->tp); 1205 s = spltty(); 1206 /* 1207 * We jump to this label after all non-interrupted sleeps to pick 1208 * up any changes of the device state. 1209 */ 1210open_top: 1211 while (com->state & CS_DTR_OFF) { 1212 error = tsleep(&com->dtr_wait, TTIPRI | PCATCH, "siodtr", 0); 1213 if (com_addr(unit) == NULL) 1214 return (ENXIO); 1215 if (error != 0 || com->gone) 1216 goto out; 1217 } 1218 if (tp->t_state & TS_ISOPEN) { 1219 /* 1220 * The device is open, so everything has been initialized. 1221 * Handle conflicts. 1222 */ 1223 if (mynor & CALLOUT_MASK) { 1224 if (!com->active_out) { 1225 error = EBUSY; 1226 goto out; 1227 } 1228 } else { 1229 if (com->active_out) { 1230 if (flag & O_NONBLOCK) { 1231 error = EBUSY; 1232 goto out; 1233 } 1234 error = tsleep(&com->active_out, 1235 TTIPRI | PCATCH, "siobi", 0); 1236 if (com_addr(unit) == NULL) 1237 return (ENXIO); 1238 if (error != 0 || com->gone) 1239 goto out; 1240 goto open_top; 1241 } 1242 } 1243 if (tp->t_state & TS_XCLUDE && 1244 suser(td)) { 1245 error = EBUSY; 1246 goto out; 1247 } 1248 } else { 1249 /* 1250 * The device isn't open, so there are no conflicts. 1251 * Initialize it. Initialization is done twice in many 1252 * cases: to preempt sleeping callin opens if we are 1253 * callout, and to complete a callin open after DCD rises. 1254 */ 1255 tp->t_oproc = comstart; 1256 tp->t_param = comparam; 1257 tp->t_stop = comstop; 1258 tp->t_dev = dev; 1259 tp->t_termios = mynor & CALLOUT_MASK 1260 ? com->it_out : com->it_in; 1261 (void)commctl(com, TIOCM_DTR | TIOCM_RTS, DMSET); 1262 com->poll = com->no_irq; 1263 com->poll_output = com->loses_outints; 1264 ++com->wopeners; 1265 error = comparam(tp, &tp->t_termios); 1266 --com->wopeners; 1267 if (error != 0) 1268 goto out; 1269 /* 1270 * XXX we should goto open_top if comparam() slept. 1271 */ 1272 if (com->hasfifo) { 1273 int i; 1274 /* 1275 * (Re)enable and drain fifos. 1276 * 1277 * Certain SMC chips cause problems if the fifos 1278 * are enabled while input is ready. Turn off the 1279 * fifo if necessary to clear the input. We test 1280 * the input ready bit after enabling the fifos 1281 * since we've already enabled them in comparam() 1282 * and to handle races between enabling and fresh 1283 * input. 1284 */ 1285 for (i = 0; i < 500; i++) { 1286 sio_setreg(com, com_fifo, 1287 FIFO_RCV_RST | FIFO_XMT_RST 1288 | com->fifo_image); 1289 /* 1290 * XXX the delays are for superstitious 1291 * historical reasons. It must be less than 1292 * the character time at the maximum 1293 * supported speed (87 usec at 115200 bps 1294 * 8N1). Otherwise we might loop endlessly 1295 * if data is streaming in. We used to use 1296 * delays of 100. That usually worked 1297 * because DELAY(100) used to usually delay 1298 * for about 85 usec instead of 100. 1299 */ 1300 DELAY(50); 1301 if (!(inb(com->line_status_port) & LSR_RXRDY)) 1302 break; 1303 sio_setreg(com, com_fifo, 0); 1304 DELAY(50); 1305 (void) inb(com->data_port); 1306 } 1307 if (i == 500) { 1308 error = EIO; 1309 goto out; 1310 } 1311 } 1312 1313 mtx_lock_spin(&sio_lock); 1314 (void) inb(com->line_status_port); 1315 (void) inb(com->data_port); 1316 com->prev_modem_status = com->last_modem_status 1317 = inb(com->modem_status_port); 1318 outb(com->int_ctl_port, 1319 IER_ERXRDY | IER_ERLS | IER_EMSC 1320 | (COM_IIR_TXRDYBUG(com->flags) ? 0 : IER_ETXRDY)); 1321 mtx_unlock_spin(&sio_lock); 1322 /* 1323 * Handle initial DCD. Callout devices get a fake initial 1324 * DCD (trapdoor DCD). If we are callout, then any sleeping 1325 * callin opens get woken up and resume sleeping on "siobi" 1326 * instead of "siodcd". 1327 */ 1328 /* 1329 * XXX `mynor & CALLOUT_MASK' should be 1330 * `tp->t_cflag & (SOFT_CARRIER | TRAPDOOR_CARRIER) where 1331 * TRAPDOOR_CARRIER is the default initial state for callout 1332 * devices and SOFT_CARRIER is like CLOCAL except it hides 1333 * the true carrier. 1334 */ 1335 if (com->prev_modem_status & MSR_DCD || mynor & CALLOUT_MASK) 1336 ttyld_modem(tp, 1); 1337 } 1338 /* 1339 * Wait for DCD if necessary. 1340 */ 1341 if (!(tp->t_state & TS_CARR_ON) && !(mynor & CALLOUT_MASK) 1342 && !(tp->t_cflag & CLOCAL) && !(flag & O_NONBLOCK)) { 1343 ++com->wopeners; 1344 error = tsleep(TSA_CARR_ON(tp), TTIPRI | PCATCH, "siodcd", 0); 1345 if (com_addr(unit) == NULL) 1346 return (ENXIO); 1347 --com->wopeners; 1348 if (error != 0 || com->gone) 1349 goto out; 1350 goto open_top; 1351 } 1352 error = ttyld_open(tp, dev); 1353 com->hotchar = ttyldoptim(tp); 1354 if (tp->t_state & TS_ISOPEN && mynor & CALLOUT_MASK) 1355 com->active_out = TRUE; 1356 siosettimeout(); 1357out: 1358 splx(s); 1359 if (!(tp->t_state & TS_ISOPEN) && com->wopeners == 0) 1360 comhardclose(com); 1361 return (error); 1362} 1363 1364static int 1365sioclose(dev, flag, mode, td) 1366 struct cdev *dev; 1367 int flag; 1368 int mode; 1369 struct thread *td; 1370{ 1371 struct com_s *com; 1372 int mynor; 1373 int s; 1374 struct tty *tp; 1375 1376 mynor = minor(dev); 1377 if (mynor & CONTROL_MASK) 1378 return (0); 1379 com = com_addr(MINOR_TO_UNIT(mynor)); 1380 if (com == NULL) 1381 return (ENODEV); 1382 tp = com->tp; 1383 s = spltty(); 1384 ttyld_close(tp, flag); 1385 com->hotchar = ttyldoptim(tp); 1386 comhardclose(com); 1387 ttyclose(tp); 1388 siosettimeout(); 1389 splx(s); 1390 if (com->gone) { 1391 printf("sio%d: gone\n", com->unit); 1392 s = spltty(); 1393 if (com->ibuf != NULL) 1394 free(com->ibuf, M_DEVBUF); 1395 bzero(tp, sizeof *tp); 1396 splx(s); 1397 } 1398 return (0); 1399} 1400 1401static void 1402comhardclose(com) 1403 struct com_s *com; 1404{ 1405 int s; 1406 struct tty *tp; 1407 1408 s = spltty(); 1409 com->poll = FALSE; 1410 com->poll_output = FALSE; 1411 com->do_timestamp = FALSE; 1412 com->do_dcd_timestamp = FALSE; 1413 com->pps.ppsparam.mode = 0; 1414 sio_setreg(com, com_cfcr, com->cfcr_image &= ~CFCR_SBREAK); 1415 tp = com->tp; 1416 1417#if defined(DDB) && (defined(BREAK_TO_DEBUGGER) || \ 1418 defined(ALT_BREAK_TO_DEBUGGER)) 1419 /* 1420 * Leave interrupts enabled and don't clear DTR if this is the 1421 * console. This allows us to detect break-to-debugger events 1422 * while the console device is closed. 1423 */ 1424 if (com->unit != comconsole) 1425#endif 1426 { 1427 sio_setreg(com, com_ier, 0); 1428 if (tp->t_cflag & HUPCL 1429 /* 1430 * XXX we will miss any carrier drop between here and the 1431 * next open. Perhaps we should watch DCD even when the 1432 * port is closed; it is not sufficient to check it at 1433 * the next open because it might go up and down while 1434 * we're not watching. 1435 */ 1436 || (!com->active_out 1437 && !(com->prev_modem_status & MSR_DCD) 1438 && !(com->it_in.c_cflag & CLOCAL)) 1439 || !(tp->t_state & TS_ISOPEN)) { 1440 (void)commctl(com, TIOCM_DTR, DMBIC); 1441 if (com->dtr_wait != 0 && !(com->state & CS_DTR_OFF)) { 1442 timeout(siodtrwakeup, com, com->dtr_wait); 1443 com->state |= CS_DTR_OFF; 1444 } 1445 } 1446 } 1447 if (com->hasfifo) { 1448 /* 1449 * Disable fifos so that they are off after controlled 1450 * reboots. Some BIOSes fail to detect 16550s when the 1451 * fifos are enabled. 1452 */ 1453 sio_setreg(com, com_fifo, 0); 1454 } 1455 com->active_out = FALSE; 1456 wakeup(&com->active_out); 1457 wakeup(TSA_CARR_ON(tp)); /* restart any wopeners */ 1458 splx(s); 1459} 1460 1461static int 1462sioread(dev, uio, flag) 1463 struct cdev *dev; 1464 struct uio *uio; 1465 int flag; 1466{ 1467 int mynor; 1468 struct com_s *com; 1469 1470 mynor = minor(dev); 1471 if (mynor & CONTROL_MASK) 1472 return (ENODEV); 1473 com = com_addr(MINOR_TO_UNIT(mynor)); 1474 if (com == NULL || com->gone) 1475 return (ENODEV); 1476 return (ttyld_read(com->tp, uio, flag)); 1477} 1478 1479static int 1480siowrite(dev, uio, flag) 1481 struct cdev *dev; 1482 struct uio *uio; 1483 int flag; 1484{ 1485 int mynor; 1486 struct com_s *com; 1487 int unit; 1488 1489 mynor = minor(dev); 1490 if (mynor & CONTROL_MASK) 1491 return (ENODEV); 1492 1493 unit = MINOR_TO_UNIT(mynor); 1494 com = com_addr(unit); 1495 if (com == NULL || com->gone) 1496 return (ENODEV); 1497 /* 1498 * (XXX) We disallow virtual consoles if the physical console is 1499 * a serial port. This is in case there is a display attached that 1500 * is not the console. In that situation we don't need/want the X 1501 * server taking over the console. 1502 */ 1503 if (constty != NULL && unit == comconsole) 1504 constty = NULL; 1505 return (ttyld_write(com->tp, uio, flag)); 1506} 1507 1508static void 1509siobusycheck(chan) 1510 void *chan; 1511{ 1512 struct com_s *com; 1513 int s; 1514 1515 com = (struct com_s *)chan; 1516 1517 /* 1518 * Clear TS_BUSY if low-level output is complete. 1519 * spl locking is sufficient because siointr1() does not set CS_BUSY. 1520 * If siointr1() clears CS_BUSY after we look at it, then we'll get 1521 * called again. Reading the line status port outside of siointr1() 1522 * is safe because CS_BUSY is clear so there are no output interrupts 1523 * to lose. 1524 */ 1525 s = spltty(); 1526 if (com->state & CS_BUSY) 1527 com->extra_state &= ~CSE_BUSYCHECK; /* False alarm. */ 1528 else if ((inb(com->line_status_port) & (LSR_TSRE | LSR_TXRDY)) 1529 == (LSR_TSRE | LSR_TXRDY)) { 1530 com->tp->t_state &= ~TS_BUSY; 1531 ttwwakeup(com->tp); 1532 com->extra_state &= ~CSE_BUSYCHECK; 1533 } else 1534 timeout(siobusycheck, com, hz / 100); 1535 splx(s); 1536} 1537 1538static u_int 1539siodivisor(rclk, speed) 1540 u_long rclk; 1541 speed_t speed; 1542{ 1543 long actual_speed; 1544 u_int divisor; 1545 int error; 1546 1547 if (speed == 0) 1548 return (0); 1549#if UINT_MAX > (ULONG_MAX - 1) / 8 1550 if (speed > (ULONG_MAX - 1) / 8) 1551 return (0); 1552#endif 1553 divisor = (rclk / (8UL * speed) + 1) / 2; 1554 if (divisor == 0 || divisor >= 65536) 1555 return (0); 1556 actual_speed = rclk / (16UL * divisor); 1557 1558 /* 10 times error in percent: */ 1559 error = ((actual_speed - (long)speed) * 2000 / (long)speed + 1) / 2; 1560 1561 /* 3.0% maximum error tolerance: */ 1562 if (error < -30 || error > 30) 1563 return (0); 1564 1565 return (divisor); 1566} 1567 1568static void 1569siodtrwakeup(chan) 1570 void *chan; 1571{ 1572 struct com_s *com; 1573 1574 com = (struct com_s *)chan; 1575 com->state &= ~CS_DTR_OFF; 1576 wakeup(&com->dtr_wait); 1577} 1578 1579/* 1580 * Call this function with the sio_lock mutex held. It will return with the 1581 * lock still held. 1582 */ 1583static void 1584sioinput(com) 1585 struct com_s *com; 1586{ 1587 u_char *buf; 1588 int incc; 1589 u_char line_status; 1590 int recv_data; 1591 struct tty *tp; 1592 1593 buf = com->ibuf; 1594 tp = com->tp; 1595 if (!(tp->t_state & TS_ISOPEN) || !(tp->t_cflag & CREAD)) { 1596 com_events -= (com->iptr - com->ibuf); 1597 com->iptr = com->ibuf; 1598 return; 1599 } 1600 if (tp->t_state & TS_CAN_BYPASS_L_RINT) { 1601 /* 1602 * Avoid the grotesquely inefficient lineswitch routine 1603 * (ttyinput) in "raw" mode. It usually takes about 450 1604 * instructions (that's without canonical processing or echo!). 1605 * slinput is reasonably fast (usually 40 instructions plus 1606 * call overhead). 1607 */ 1608 do { 1609 /* 1610 * This may look odd, but it is using save-and-enable 1611 * semantics instead of the save-and-disable semantics 1612 * that are used everywhere else. 1613 */ 1614 mtx_unlock_spin(&sio_lock); 1615 incc = com->iptr - buf; 1616 if (tp->t_rawq.c_cc + incc > tp->t_ihiwat 1617 && (com->state & CS_RTS_IFLOW 1618 || tp->t_iflag & IXOFF) 1619 && !(tp->t_state & TS_TBLOCK)) 1620 ttyblock(tp); 1621 com->delta_error_counts[CE_TTY_BUF_OVERFLOW] 1622 += b_to_q((char *)buf, incc, &tp->t_rawq); 1623 buf += incc; 1624 tk_nin += incc; 1625 tk_rawcc += incc; 1626 tp->t_rawcc += incc; 1627 ttwakeup(tp); 1628 if (tp->t_state & TS_TTSTOP 1629 && (tp->t_iflag & IXANY 1630 || tp->t_cc[VSTART] == tp->t_cc[VSTOP])) { 1631 tp->t_state &= ~TS_TTSTOP; 1632 tp->t_lflag &= ~FLUSHO; 1633 comstart(tp); 1634 } 1635 mtx_lock_spin(&sio_lock); 1636 } while (buf < com->iptr); 1637 } else { 1638 do { 1639 /* 1640 * This may look odd, but it is using save-and-enable 1641 * semantics instead of the save-and-disable semantics 1642 * that are used everywhere else. 1643 */ 1644 mtx_unlock_spin(&sio_lock); 1645 line_status = buf[com->ierroff]; 1646 recv_data = *buf++; 1647 if (line_status 1648 & (LSR_BI | LSR_FE | LSR_OE | LSR_PE)) { 1649 if (line_status & LSR_BI) 1650 recv_data |= TTY_BI; 1651 if (line_status & LSR_FE) 1652 recv_data |= TTY_FE; 1653 if (line_status & LSR_OE) 1654 recv_data |= TTY_OE; 1655 if (line_status & LSR_PE) 1656 recv_data |= TTY_PE; 1657 } 1658 ttyld_rint(tp, recv_data); 1659 mtx_lock_spin(&sio_lock); 1660 } while (buf < com->iptr); 1661 } 1662 com_events -= (com->iptr - com->ibuf); 1663 com->iptr = com->ibuf; 1664 1665 /* 1666 * There is now room for another low-level buffer full of input, 1667 * so enable RTS if it is now disabled and there is room in the 1668 * high-level buffer. 1669 */ 1670 if ((com->state & CS_RTS_IFLOW) && !(com->mcr_image & MCR_RTS) && 1671 !(tp->t_state & TS_TBLOCK)) 1672 outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS); 1673} 1674 1675static void 1676siointr(arg) 1677 void *arg; 1678{ 1679 struct com_s *com; 1680 1681#ifndef COM_MULTIPORT 1682 com = (struct com_s *)arg; 1683 1684 mtx_lock_spin(&sio_lock); 1685 siointr1(com); 1686 mtx_unlock_spin(&sio_lock); 1687#else /* COM_MULTIPORT */ 1688 bool_t possibly_more_intrs; 1689 int unit; 1690 1691 /* 1692 * Loop until there is no activity on any port. This is necessary 1693 * to get an interrupt edge more than to avoid another interrupt. 1694 * If the IRQ signal is just an OR of the IRQ signals from several 1695 * devices, then the edge from one may be lost because another is 1696 * on. 1697 */ 1698 mtx_lock_spin(&sio_lock); 1699 do { 1700 possibly_more_intrs = FALSE; 1701 for (unit = 0; unit < sio_numunits; ++unit) { 1702 com = com_addr(unit); 1703 /* 1704 * XXX COM_LOCK(); 1705 * would it work here, or be counter-productive? 1706 */ 1707 if (com != NULL 1708 && !com->gone 1709 && (inb(com->int_id_port) & IIR_IMASK) 1710 != IIR_NOPEND) { 1711 siointr1(com); 1712 possibly_more_intrs = TRUE; 1713 } 1714 /* XXX COM_UNLOCK(); */ 1715 } 1716 } while (possibly_more_intrs); 1717 mtx_unlock_spin(&sio_lock); 1718#endif /* COM_MULTIPORT */ 1719} 1720 1721static struct timespec siots[8]; 1722static int siotso; 1723static int volatile siotsunit = -1; 1724 1725static int 1726sysctl_siots(SYSCTL_HANDLER_ARGS) 1727{ 1728 char buf[128]; 1729 long long delta; 1730 size_t len; 1731 int error, i, tso; 1732 1733 for (i = 1, tso = siotso; i < tso; i++) { 1734 delta = (long long)(siots[i].tv_sec - siots[i - 1].tv_sec) * 1735 1000000000 + 1736 (siots[i].tv_nsec - siots[i - 1].tv_nsec); 1737 len = sprintf(buf, "%lld\n", delta); 1738 if (delta >= 110000) 1739 len += sprintf(buf + len - 1, ": *** %ld.%09ld\n", 1740 (long)siots[i].tv_sec, siots[i].tv_nsec) - 1; 1741 if (i == tso - 1) 1742 buf[len - 1] = '\0'; 1743 error = SYSCTL_OUT(req, buf, len); 1744 if (error != 0) 1745 return (error); 1746 uio_yield(); 1747 } 1748 return (0); 1749} 1750 1751SYSCTL_PROC(_machdep, OID_AUTO, siots, CTLTYPE_STRING | CTLFLAG_RD, 1752 0, 0, sysctl_siots, "A", "sio timestamps"); 1753 1754static void 1755siointr1(com) 1756 struct com_s *com; 1757{ 1758 u_char int_ctl; 1759 u_char int_ctl_new; 1760 u_char line_status; 1761 u_char modem_status; 1762 u_char *ioptr; 1763 u_char recv_data; 1764 1765 if (COM_IIR_TXRDYBUG(com->flags)) { 1766 int_ctl = inb(com->int_ctl_port); 1767 int_ctl_new = int_ctl; 1768 } else { 1769 int_ctl = 0; 1770 int_ctl_new = 0; 1771 } 1772 1773 while (!com->gone) { 1774 if (com->pps.ppsparam.mode & PPS_CAPTUREBOTH) { 1775 modem_status = inb(com->modem_status_port); 1776 if ((modem_status ^ com->last_modem_status) & 1777 com->pps_bit) { 1778 pps_capture(&com->pps); 1779 pps_event(&com->pps, 1780 (modem_status & com->pps_bit) ? 1781 PPS_CAPTUREASSERT : PPS_CAPTURECLEAR); 1782 } 1783 } 1784 line_status = inb(com->line_status_port); 1785 1786 /* input event? (check first to help avoid overruns) */ 1787 while (line_status & LSR_RCV_MASK) { 1788 /* break/unnattached error bits or real input? */ 1789 if (!(line_status & LSR_RXRDY)) 1790 recv_data = 0; 1791 else 1792 recv_data = inb(com->data_port); 1793#ifdef DDB 1794#ifdef ALT_BREAK_TO_DEBUGGER 1795 if (com->unit == comconsole && 1796 db_alt_break(recv_data, &com->alt_brk_state) != 0) 1797 breakpoint(); 1798#endif /* ALT_BREAK_TO_DEBUGGER */ 1799#endif /* DDB */ 1800 if (line_status & (LSR_BI | LSR_FE | LSR_PE)) { 1801 /* 1802 * Don't store BI if IGNBRK or FE/PE if IGNPAR. 1803 * Otherwise, push the work to a higher level 1804 * (to handle PARMRK) if we're bypassing. 1805 * Otherwise, convert BI/FE and PE+INPCK to 0. 1806 * 1807 * This makes bypassing work right in the 1808 * usual "raw" case (IGNBRK set, and IGNPAR 1809 * and INPCK clear). 1810 * 1811 * Note: BI together with FE/PE means just BI. 1812 */ 1813 if (line_status & LSR_BI) { 1814#if defined(DDB) && defined(BREAK_TO_DEBUGGER) 1815 if (com->unit == comconsole) { 1816 breakpoint(); 1817 goto cont; 1818 } 1819#endif 1820 if (com->tp == NULL 1821 || com->tp->t_iflag & IGNBRK) 1822 goto cont; 1823 } else { 1824 if (com->tp == NULL 1825 || com->tp->t_iflag & IGNPAR) 1826 goto cont; 1827 } 1828 if (com->tp->t_state & TS_CAN_BYPASS_L_RINT 1829 && (line_status & (LSR_BI | LSR_FE) 1830 || com->tp->t_iflag & INPCK)) 1831 recv_data = 0; 1832 } 1833 ++com->bytes_in; 1834 if (com->hotchar != 0 && recv_data == com->hotchar) 1835 swi_sched(sio_fast_ih, 0); 1836 ioptr = com->iptr; 1837 if (ioptr >= com->ibufend) 1838 CE_RECORD(com, CE_INTERRUPT_BUF_OVERFLOW); 1839 else { 1840 if (com->do_timestamp) 1841 microtime(&com->timestamp); 1842 ++com_events; 1843 swi_sched(sio_slow_ih, SWI_DELAY); 1844#if 0 /* for testing input latency vs efficiency */ 1845if (com->iptr - com->ibuf == 8) 1846 swi_sched(sio_fast_ih, 0); 1847#endif 1848 ioptr[0] = recv_data; 1849 ioptr[com->ierroff] = line_status; 1850 com->iptr = ++ioptr; 1851 if (ioptr == com->ihighwater 1852 && com->state & CS_RTS_IFLOW) 1853 outb(com->modem_ctl_port, 1854 com->mcr_image &= ~MCR_RTS); 1855 if (line_status & LSR_OE) 1856 CE_RECORD(com, CE_OVERRUN); 1857 } 1858cont: 1859 if (line_status & LSR_TXRDY 1860 && com->state >= (CS_BUSY | CS_TTGO | CS_ODEVREADY)) 1861 goto txrdy; 1862 1863 /* 1864 * "& 0x7F" is to avoid the gcc-1.40 generating a slow 1865 * jump from the top of the loop to here 1866 */ 1867 line_status = inb(com->line_status_port) & 0x7F; 1868 } 1869 1870 /* modem status change? (always check before doing output) */ 1871 modem_status = inb(com->modem_status_port); 1872 if (modem_status != com->last_modem_status) { 1873 if (com->do_dcd_timestamp 1874 && !(com->last_modem_status & MSR_DCD) 1875 && modem_status & MSR_DCD) 1876 microtime(&com->dcd_timestamp); 1877 1878 /* 1879 * Schedule high level to handle DCD changes. Note 1880 * that we don't use the delta bits anywhere. Some 1881 * UARTs mess them up, and it's easy to remember the 1882 * previous bits and calculate the delta. 1883 */ 1884 com->last_modem_status = modem_status; 1885 if (!(com->state & CS_CHECKMSR)) { 1886 com_events += LOTS_OF_EVENTS; 1887 com->state |= CS_CHECKMSR; 1888 swi_sched(sio_fast_ih, 0); 1889 } 1890 1891 /* handle CTS change immediately for crisp flow ctl */ 1892 if (com->state & CS_CTS_OFLOW) { 1893 if (modem_status & MSR_CTS) 1894 com->state |= CS_ODEVREADY; 1895 else 1896 com->state &= ~CS_ODEVREADY; 1897 } 1898 } 1899 1900txrdy: 1901 /* output queued and everything ready? */ 1902 if (line_status & LSR_TXRDY 1903 && com->state >= (CS_BUSY | CS_TTGO | CS_ODEVREADY)) { 1904 ioptr = com->obufq.l_head; 1905 if (com->tx_fifo_size > 1 && com->unit != siotsunit) { 1906 u_int ocount; 1907 1908 ocount = com->obufq.l_tail - ioptr; 1909 if (ocount > com->tx_fifo_size) 1910 ocount = com->tx_fifo_size; 1911 com->bytes_out += ocount; 1912 do 1913 outb(com->data_port, *ioptr++); 1914 while (--ocount != 0); 1915 } else { 1916 outb(com->data_port, *ioptr++); 1917 ++com->bytes_out; 1918 if (com->unit == siotsunit 1919 && siotso < sizeof siots / sizeof siots[0]) 1920 nanouptime(&siots[siotso++]); 1921 } 1922 com->obufq.l_head = ioptr; 1923 if (COM_IIR_TXRDYBUG(com->flags)) 1924 int_ctl_new = int_ctl | IER_ETXRDY; 1925 if (ioptr >= com->obufq.l_tail) { 1926 struct lbq *qp; 1927 1928 qp = com->obufq.l_next; 1929 qp->l_queued = FALSE; 1930 qp = qp->l_next; 1931 if (qp != NULL) { 1932 com->obufq.l_head = qp->l_head; 1933 com->obufq.l_tail = qp->l_tail; 1934 com->obufq.l_next = qp; 1935 } else { 1936 /* output just completed */ 1937 if (COM_IIR_TXRDYBUG(com->flags)) 1938 int_ctl_new = int_ctl 1939 & ~IER_ETXRDY; 1940 com->state &= ~CS_BUSY; 1941 } 1942 if (!(com->state & CS_ODONE)) { 1943 com_events += LOTS_OF_EVENTS; 1944 com->state |= CS_ODONE; 1945 /* handle at high level ASAP */ 1946 swi_sched(sio_fast_ih, 0); 1947 } 1948 } 1949 if (COM_IIR_TXRDYBUG(com->flags) 1950 && int_ctl != int_ctl_new) 1951 outb(com->int_ctl_port, int_ctl_new); 1952 } 1953 1954 /* finished? */ 1955#ifndef COM_MULTIPORT 1956 if ((inb(com->int_id_port) & IIR_IMASK) == IIR_NOPEND) 1957#endif /* COM_MULTIPORT */ 1958 return; 1959 } 1960} 1961 1962static int 1963sioioctl(dev, cmd, data, flag, td) 1964 struct cdev *dev; 1965 u_long cmd; 1966 caddr_t data; 1967 int flag; 1968 struct thread *td; 1969{ 1970 struct com_s *com; 1971 int error; 1972 int mynor; 1973 int s; 1974 struct tty *tp; 1975#if defined(COMPAT_43) 1976 u_long oldcmd; 1977 struct termios term; 1978#endif 1979 1980 mynor = minor(dev); 1981 com = com_addr(MINOR_TO_UNIT(mynor)); 1982 if (com == NULL || com->gone) 1983 return (ENODEV); 1984 if (mynor & CONTROL_MASK) { 1985 struct termios *ct; 1986 1987 switch (mynor & CONTROL_MASK) { 1988 case CONTROL_INIT_STATE: 1989 ct = mynor & CALLOUT_MASK ? &com->it_out : &com->it_in; 1990 break; 1991 case CONTROL_LOCK_STATE: 1992 ct = mynor & CALLOUT_MASK ? &com->lt_out : &com->lt_in; 1993 break; 1994 default: 1995 return (ENODEV); /* /dev/nodev */ 1996 } 1997 switch (cmd) { 1998 case TIOCSETA: 1999 error = suser(td); 2000 if (error != 0) 2001 return (error); 2002 *ct = *(struct termios *)data; 2003 return (0); 2004 case TIOCGETA: 2005 *(struct termios *)data = *ct; 2006 return (0); 2007 case TIOCGETD: 2008 *(int *)data = TTYDISC; 2009 return (0); 2010 case TIOCGWINSZ: 2011 bzero(data, sizeof(struct winsize)); 2012 return (0); 2013 default: 2014 return (ENOTTY); 2015 } 2016 } 2017 tp = com->tp; 2018#if defined(COMPAT_43) 2019 term = tp->t_termios; 2020 oldcmd = cmd; 2021 error = ttsetcompat(tp, &cmd, data, &term); 2022 if (error != 0) 2023 return (error); 2024 if (cmd != oldcmd) 2025 data = (caddr_t)&term; 2026#endif 2027 if (cmd == TIOCSETA || cmd == TIOCSETAW || cmd == TIOCSETAF) { 2028 int cc; 2029 struct termios *dt = (struct termios *)data; 2030 struct termios *lt = mynor & CALLOUT_MASK 2031 ? &com->lt_out : &com->lt_in; 2032 2033 dt->c_iflag = (tp->t_iflag & lt->c_iflag) 2034 | (dt->c_iflag & ~lt->c_iflag); 2035 dt->c_oflag = (tp->t_oflag & lt->c_oflag) 2036 | (dt->c_oflag & ~lt->c_oflag); 2037 dt->c_cflag = (tp->t_cflag & lt->c_cflag) 2038 | (dt->c_cflag & ~lt->c_cflag); 2039 dt->c_lflag = (tp->t_lflag & lt->c_lflag) 2040 | (dt->c_lflag & ~lt->c_lflag); 2041 for (cc = 0; cc < NCCS; ++cc) 2042 if (lt->c_cc[cc] != 0) 2043 dt->c_cc[cc] = tp->t_cc[cc]; 2044 if (lt->c_ispeed != 0) 2045 dt->c_ispeed = tp->t_ispeed; 2046 if (lt->c_ospeed != 0) 2047 dt->c_ospeed = tp->t_ospeed; 2048 } 2049 error = ttyioctl(dev, cmd, data, flag, td); 2050 com->hotchar = ttyldoptim(tp); 2051 if (error != ENOTTY) 2052 return (error); 2053 s = spltty(); 2054 switch (cmd) { 2055 case TIOCSBRK: 2056 sio_setreg(com, com_cfcr, com->cfcr_image |= CFCR_SBREAK); 2057 break; 2058 case TIOCCBRK: 2059 sio_setreg(com, com_cfcr, com->cfcr_image &= ~CFCR_SBREAK); 2060 break; 2061 case TIOCSDTR: 2062 (void)commctl(com, TIOCM_DTR, DMBIS); 2063 break; 2064 case TIOCCDTR: 2065 (void)commctl(com, TIOCM_DTR, DMBIC); 2066 break; 2067 /* 2068 * XXX should disallow changing MCR_RTS if CS_RTS_IFLOW is set. The 2069 * changes get undone on the next call to comparam(). 2070 */ 2071 case TIOCMSET: 2072 (void)commctl(com, *(int *)data, DMSET); 2073 break; 2074 case TIOCMBIS: 2075 (void)commctl(com, *(int *)data, DMBIS); 2076 break; 2077 case TIOCMBIC: 2078 (void)commctl(com, *(int *)data, DMBIC); 2079 break; 2080 case TIOCMGET: 2081 *(int *)data = commctl(com, 0, DMGET); 2082 break; 2083 case TIOCMSDTRWAIT: 2084 /* must be root since the wait applies to following logins */ 2085 error = suser(td); 2086 if (error != 0) { 2087 splx(s); 2088 return (error); 2089 } 2090 com->dtr_wait = *(int *)data * hz / 100; 2091 break; 2092 case TIOCMGDTRWAIT: 2093 *(int *)data = com->dtr_wait * 100 / hz; 2094 break; 2095 case TIOCTIMESTAMP: 2096 com->do_timestamp = TRUE; 2097 *(struct timeval *)data = com->timestamp; 2098 break; 2099 case TIOCDCDTIMESTAMP: 2100 com->do_dcd_timestamp = TRUE; 2101 *(struct timeval *)data = com->dcd_timestamp; 2102 break; 2103 default: 2104 splx(s); 2105 error = pps_ioctl(cmd, data, &com->pps); 2106 if (error == ENODEV) 2107 error = ENOTTY; 2108 return (error); 2109 } 2110 splx(s); 2111 return (0); 2112} 2113 2114/* software interrupt handler for SWI_TTY */ 2115static void 2116siopoll(void *dummy) 2117{ 2118 int unit; 2119 2120 if (com_events == 0) 2121 return; 2122repeat: 2123 for (unit = 0; unit < sio_numunits; ++unit) { 2124 struct com_s *com; 2125 int incc; 2126 struct tty *tp; 2127 2128 com = com_addr(unit); 2129 if (com == NULL) 2130 continue; 2131 tp = com->tp; 2132 if (tp == NULL || com->gone) { 2133 /* 2134 * Discard any events related to never-opened or 2135 * going-away devices. 2136 */ 2137 mtx_lock_spin(&sio_lock); 2138 incc = com->iptr - com->ibuf; 2139 com->iptr = com->ibuf; 2140 if (com->state & CS_CHECKMSR) { 2141 incc += LOTS_OF_EVENTS; 2142 com->state &= ~CS_CHECKMSR; 2143 } 2144 com_events -= incc; 2145 mtx_unlock_spin(&sio_lock); 2146 continue; 2147 } 2148 if (com->iptr != com->ibuf) { 2149 mtx_lock_spin(&sio_lock); 2150 sioinput(com); 2151 mtx_unlock_spin(&sio_lock); 2152 } 2153 if (com->state & CS_CHECKMSR) { 2154 u_char delta_modem_status; 2155 2156 mtx_lock_spin(&sio_lock); 2157 delta_modem_status = com->last_modem_status 2158 ^ com->prev_modem_status; 2159 com->prev_modem_status = com->last_modem_status; 2160 com_events -= LOTS_OF_EVENTS; 2161 com->state &= ~CS_CHECKMSR; 2162 mtx_unlock_spin(&sio_lock); 2163 if (delta_modem_status & MSR_DCD) 2164 ttyld_modem(tp, 2165 com->prev_modem_status & MSR_DCD); 2166 } 2167 if (com->state & CS_ODONE) { 2168 mtx_lock_spin(&sio_lock); 2169 com_events -= LOTS_OF_EVENTS; 2170 com->state &= ~CS_ODONE; 2171 mtx_unlock_spin(&sio_lock); 2172 if (!(com->state & CS_BUSY) 2173 && !(com->extra_state & CSE_BUSYCHECK)) { 2174 timeout(siobusycheck, com, hz / 100); 2175 com->extra_state |= CSE_BUSYCHECK; 2176 } 2177 ttyld_start(tp); 2178 } 2179 if (com_events == 0) 2180 break; 2181 } 2182 if (com_events >= LOTS_OF_EVENTS) 2183 goto repeat; 2184} 2185 2186static int 2187comparam(tp, t) 2188 struct tty *tp; 2189 struct termios *t; 2190{ 2191 u_int cfcr; 2192 int cflag; 2193 struct com_s *com; 2194 u_int divisor; 2195 u_char dlbh; 2196 u_char dlbl; 2197 u_char efr_flowbits; 2198 int s; 2199 int unit; 2200 2201 unit = DEV_TO_UNIT(tp->t_dev); 2202 com = com_addr(unit); 2203 if (com == NULL) 2204 return (ENODEV); 2205 2206 /* check requested parameters */ 2207 if (t->c_ispeed != (t->c_ospeed != 0 ? t->c_ospeed : tp->t_ospeed)) 2208 return (EINVAL); 2209 divisor = siodivisor(com->rclk, t->c_ispeed); 2210 if (divisor == 0) 2211 return (EINVAL); 2212 2213 /* parameters are OK, convert them to the com struct and the device */ 2214 s = spltty(); 2215 if (t->c_ospeed == 0) 2216 (void)commctl(com, TIOCM_DTR, DMBIC); /* hang up line */ 2217 else 2218 (void)commctl(com, TIOCM_DTR, DMBIS); 2219 cflag = t->c_cflag; 2220 switch (cflag & CSIZE) { 2221 case CS5: 2222 cfcr = CFCR_5BITS; 2223 break; 2224 case CS6: 2225 cfcr = CFCR_6BITS; 2226 break; 2227 case CS7: 2228 cfcr = CFCR_7BITS; 2229 break; 2230 default: 2231 cfcr = CFCR_8BITS; 2232 break; 2233 } 2234 if (cflag & PARENB) { 2235 cfcr |= CFCR_PENAB; 2236 if (!(cflag & PARODD)) 2237 cfcr |= CFCR_PEVEN; 2238 } 2239 if (cflag & CSTOPB) 2240 cfcr |= CFCR_STOPB; 2241 2242 if (com->hasfifo) { 2243 /* 2244 * Use a fifo trigger level low enough so that the input 2245 * latency from the fifo is less than about 16 msec and 2246 * the total latency is less than about 30 msec. These 2247 * latencies are reasonable for humans. Serial comms 2248 * protocols shouldn't expect anything better since modem 2249 * latencies are larger. 2250 * 2251 * The fifo trigger level cannot be set at RX_HIGH for high 2252 * speed connections without further work on reducing 2253 * interrupt disablement times in other parts of the system, 2254 * without producing silo overflow errors. 2255 */ 2256 com->fifo_image = com->unit == siotsunit ? 0 2257 : t->c_ispeed <= 4800 2258 ? FIFO_ENABLE : FIFO_ENABLE | FIFO_RX_MEDH; 2259#ifdef COM_ESP 2260 /* 2261 * The Hayes ESP card needs the fifo DMA mode bit set 2262 * in compatibility mode. If not, it will interrupt 2263 * for each character received. 2264 */ 2265 if (com->esp) 2266 com->fifo_image |= FIFO_DMA_MODE; 2267#endif 2268 sio_setreg(com, com_fifo, com->fifo_image); 2269 } 2270 2271 /* 2272 * This returns with interrupts disabled so that we can complete 2273 * the speed change atomically. Keeping interrupts disabled is 2274 * especially important while com_data is hidden. 2275 */ 2276 (void) siosetwater(com, t->c_ispeed); 2277 2278 sio_setreg(com, com_cfcr, cfcr | CFCR_DLAB); 2279 /* 2280 * Only set the divisor registers if they would change, since on 2281 * some 16550 incompatibles (UMC8669F), setting them while input 2282 * is arriving loses sync until data stops arriving. 2283 */ 2284 dlbl = divisor & 0xFF; 2285 if (sio_getreg(com, com_dlbl) != dlbl) 2286 sio_setreg(com, com_dlbl, dlbl); 2287 dlbh = divisor >> 8; 2288 if (sio_getreg(com, com_dlbh) != dlbh) 2289 sio_setreg(com, com_dlbh, dlbh); 2290 2291 efr_flowbits = 0; 2292 2293 if (cflag & CRTS_IFLOW) { 2294 com->state |= CS_RTS_IFLOW; 2295 efr_flowbits |= EFR_AUTORTS; 2296 /* 2297 * If CS_RTS_IFLOW just changed from off to on, the change 2298 * needs to be propagated to MCR_RTS. This isn't urgent, 2299 * so do it later by calling comstart() instead of repeating 2300 * a lot of code from comstart() here. 2301 */ 2302 } else if (com->state & CS_RTS_IFLOW) { 2303 com->state &= ~CS_RTS_IFLOW; 2304 /* 2305 * CS_RTS_IFLOW just changed from on to off. Force MCR_RTS 2306 * on here, since comstart() won't do it later. 2307 */ 2308 outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS); 2309 } 2310 2311 /* 2312 * Set up state to handle output flow control. 2313 * XXX - worth handling MDMBUF (DCD) flow control at the lowest level? 2314 * Now has 10+ msec latency, while CTS flow has 50- usec latency. 2315 */ 2316 com->state |= CS_ODEVREADY; 2317 com->state &= ~CS_CTS_OFLOW; 2318 if (cflag & CCTS_OFLOW) { 2319 com->state |= CS_CTS_OFLOW; 2320 efr_flowbits |= EFR_AUTOCTS; 2321 if (!(com->last_modem_status & MSR_CTS)) 2322 com->state &= ~CS_ODEVREADY; 2323 } 2324 2325 if (com->st16650a) { 2326 sio_setreg(com, com_lcr, LCR_EFR_ENABLE); 2327 sio_setreg(com, com_efr, 2328 (sio_getreg(com, com_efr) 2329 & ~(EFR_AUTOCTS | EFR_AUTORTS)) | efr_flowbits); 2330 } 2331 sio_setreg(com, com_cfcr, com->cfcr_image = cfcr); 2332 2333 /* XXX shouldn't call functions while intrs are disabled. */ 2334 com->hotchar = ttyldoptim(tp); 2335 2336 mtx_unlock_spin(&sio_lock); 2337 splx(s); 2338 comstart(tp); 2339 if (com->ibufold != NULL) { 2340 free(com->ibufold, M_DEVBUF); 2341 com->ibufold = NULL; 2342 } 2343 return (0); 2344} 2345 2346/* 2347 * This function must be called with the sio_lock mutex released and will 2348 * return with it obtained. 2349 */ 2350static int 2351siosetwater(com, speed) 2352 struct com_s *com; 2353 speed_t speed; 2354{ 2355 int cp4ticks; 2356 u_char *ibuf; 2357 int ibufsize; 2358 struct tty *tp; 2359 2360 /* 2361 * Make the buffer size large enough to handle a softtty interrupt 2362 * latency of about 2 ticks without loss of throughput or data 2363 * (about 3 ticks if input flow control is not used or not honoured, 2364 * but a bit less for CS5-CS7 modes). 2365 */ 2366 cp4ticks = speed / 10 / hz * 4; 2367 for (ibufsize = 128; ibufsize < cp4ticks;) 2368 ibufsize <<= 1; 2369 if (ibufsize == com->ibufsize) { 2370 mtx_lock_spin(&sio_lock); 2371 return (0); 2372 } 2373 2374 /* 2375 * Allocate input buffer. The extra factor of 2 in the size is 2376 * to allow for an error byte for each input byte. 2377 */ 2378 ibuf = malloc(2 * ibufsize, M_DEVBUF, M_NOWAIT); 2379 if (ibuf == NULL) { 2380 mtx_lock_spin(&sio_lock); 2381 return (ENOMEM); 2382 } 2383 2384 /* Initialize non-critical variables. */ 2385 com->ibufold = com->ibuf; 2386 com->ibufsize = ibufsize; 2387 tp = com->tp; 2388 if (tp != NULL) { 2389 tp->t_ififosize = 2 * ibufsize; 2390 tp->t_ispeedwat = (speed_t)-1; 2391 tp->t_ospeedwat = (speed_t)-1; 2392 } 2393 2394 /* 2395 * Read current input buffer, if any. Continue with interrupts 2396 * disabled. 2397 */ 2398 mtx_lock_spin(&sio_lock); 2399 if (com->iptr != com->ibuf) 2400 sioinput(com); 2401 2402 /*- 2403 * Initialize critical variables, including input buffer watermarks. 2404 * The external device is asked to stop sending when the buffer 2405 * exactly reaches high water, or when the high level requests it. 2406 * The high level is notified immediately (rather than at a later 2407 * clock tick) when this watermark is reached. 2408 * The buffer size is chosen so the watermark should almost never 2409 * be reached. 2410 * The low watermark is invisibly 0 since the buffer is always 2411 * emptied all at once. 2412 */ 2413 com->iptr = com->ibuf = ibuf; 2414 com->ibufend = ibuf + ibufsize; 2415 com->ierroff = ibufsize; 2416 com->ihighwater = ibuf + 3 * ibufsize / 4; 2417 return (0); 2418} 2419 2420static void 2421comstart(tp) 2422 struct tty *tp; 2423{ 2424 struct com_s *com; 2425 int s; 2426 int unit; 2427 2428 unit = DEV_TO_UNIT(tp->t_dev); 2429 com = com_addr(unit); 2430 if (com == NULL) 2431 return; 2432 s = spltty(); 2433 mtx_lock_spin(&sio_lock); 2434 if (tp->t_state & TS_TTSTOP) 2435 com->state &= ~CS_TTGO; 2436 else 2437 com->state |= CS_TTGO; 2438 if (tp->t_state & TS_TBLOCK) { 2439 if (com->mcr_image & MCR_RTS && com->state & CS_RTS_IFLOW) 2440 outb(com->modem_ctl_port, com->mcr_image &= ~MCR_RTS); 2441 } else { 2442 if (!(com->mcr_image & MCR_RTS) && com->iptr < com->ihighwater 2443 && com->state & CS_RTS_IFLOW) 2444 outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS); 2445 } 2446 mtx_unlock_spin(&sio_lock); 2447 if (tp->t_state & (TS_TIMEOUT | TS_TTSTOP)) { 2448 ttwwakeup(tp); 2449 splx(s); 2450 return; 2451 } 2452 if (tp->t_outq.c_cc != 0) { 2453 struct lbq *qp; 2454 struct lbq *next; 2455 2456 if (!com->obufs[0].l_queued) { 2457 com->obufs[0].l_tail 2458 = com->obuf1 + q_to_b(&tp->t_outq, com->obuf1, 2459 sizeof com->obuf1); 2460 com->obufs[0].l_next = NULL; 2461 com->obufs[0].l_queued = TRUE; 2462 mtx_lock_spin(&sio_lock); 2463 if (com->state & CS_BUSY) { 2464 qp = com->obufq.l_next; 2465 while ((next = qp->l_next) != NULL) 2466 qp = next; 2467 qp->l_next = &com->obufs[0]; 2468 } else { 2469 com->obufq.l_head = com->obufs[0].l_head; 2470 com->obufq.l_tail = com->obufs[0].l_tail; 2471 com->obufq.l_next = &com->obufs[0]; 2472 com->state |= CS_BUSY; 2473 } 2474 mtx_unlock_spin(&sio_lock); 2475 } 2476 if (tp->t_outq.c_cc != 0 && !com->obufs[1].l_queued) { 2477 com->obufs[1].l_tail 2478 = com->obuf2 + q_to_b(&tp->t_outq, com->obuf2, 2479 sizeof com->obuf2); 2480 com->obufs[1].l_next = NULL; 2481 com->obufs[1].l_queued = TRUE; 2482 mtx_lock_spin(&sio_lock); 2483 if (com->state & CS_BUSY) { 2484 qp = com->obufq.l_next; 2485 while ((next = qp->l_next) != NULL) 2486 qp = next; 2487 qp->l_next = &com->obufs[1]; 2488 } else { 2489 com->obufq.l_head = com->obufs[1].l_head; 2490 com->obufq.l_tail = com->obufs[1].l_tail; 2491 com->obufq.l_next = &com->obufs[1]; 2492 com->state |= CS_BUSY; 2493 } 2494 mtx_unlock_spin(&sio_lock); 2495 } 2496 tp->t_state |= TS_BUSY; 2497 } 2498 mtx_lock_spin(&sio_lock); 2499 if (com->state >= (CS_BUSY | CS_TTGO)) 2500 siointr1(com); /* fake interrupt to start output */ 2501 mtx_unlock_spin(&sio_lock); 2502 ttwwakeup(tp); 2503 splx(s); 2504} 2505 2506static void 2507comstop(tp, rw) 2508 struct tty *tp; 2509 int rw; 2510{ 2511 struct com_s *com; 2512 2513 com = com_addr(DEV_TO_UNIT(tp->t_dev)); 2514 if (com == NULL || com->gone) 2515 return; 2516 mtx_lock_spin(&sio_lock); 2517 if (rw & FWRITE) { 2518 if (com->hasfifo) 2519#ifdef COM_ESP 2520 /* XXX avoid h/w bug. */ 2521 if (!com->esp) 2522#endif 2523 sio_setreg(com, com_fifo, 2524 FIFO_XMT_RST | com->fifo_image); 2525 com->obufs[0].l_queued = FALSE; 2526 com->obufs[1].l_queued = FALSE; 2527 if (com->state & CS_ODONE) 2528 com_events -= LOTS_OF_EVENTS; 2529 com->state &= ~(CS_ODONE | CS_BUSY); 2530 com->tp->t_state &= ~TS_BUSY; 2531 } 2532 if (rw & FREAD) { 2533 if (com->hasfifo) 2534#ifdef COM_ESP 2535 /* XXX avoid h/w bug. */ 2536 if (!com->esp) 2537#endif 2538 sio_setreg(com, com_fifo, 2539 FIFO_RCV_RST | com->fifo_image); 2540 com_events -= (com->iptr - com->ibuf); 2541 com->iptr = com->ibuf; 2542 } 2543 mtx_unlock_spin(&sio_lock); 2544 comstart(tp); 2545} 2546 2547static int 2548commctl(com, bits, how) 2549 struct com_s *com; 2550 int bits; 2551 int how; 2552{ 2553 int mcr; 2554 int msr; 2555 2556 if (how == DMGET) { 2557 bits = TIOCM_LE; /* XXX - always enabled while open */ 2558 mcr = com->mcr_image; 2559 if (mcr & MCR_DTR) 2560 bits |= TIOCM_DTR; 2561 if (mcr & MCR_RTS) 2562 bits |= TIOCM_RTS; 2563 msr = com->prev_modem_status; 2564 if (msr & MSR_CTS) 2565 bits |= TIOCM_CTS; 2566 if (msr & MSR_DCD) 2567 bits |= TIOCM_CD; 2568 if (msr & MSR_DSR) 2569 bits |= TIOCM_DSR; 2570 /* 2571 * XXX - MSR_RI is naturally volatile, and we make MSR_TERI 2572 * more volatile by reading the modem status a lot. Perhaps 2573 * we should latch both bits until the status is read here. 2574 */ 2575 if (msr & (MSR_RI | MSR_TERI)) 2576 bits |= TIOCM_RI; 2577 return (bits); 2578 } 2579 mcr = 0; 2580 if (bits & TIOCM_DTR) 2581 mcr |= MCR_DTR; 2582 if (bits & TIOCM_RTS) 2583 mcr |= MCR_RTS; 2584 if (com->gone) 2585 return(0); 2586 mtx_lock_spin(&sio_lock); 2587 switch (how) { 2588 case DMSET: 2589 outb(com->modem_ctl_port, 2590 com->mcr_image = mcr | (com->mcr_image & MCR_IENABLE)); 2591 break; 2592 case DMBIS: 2593 outb(com->modem_ctl_port, com->mcr_image |= mcr); 2594 break; 2595 case DMBIC: 2596 outb(com->modem_ctl_port, com->mcr_image &= ~mcr); 2597 break; 2598 } 2599 mtx_unlock_spin(&sio_lock); 2600 return (0); 2601} 2602 2603static void 2604siosettimeout() 2605{ 2606 struct com_s *com; 2607 bool_t someopen; 2608 int unit; 2609 2610 /* 2611 * Set our timeout period to 1 second if no polled devices are open. 2612 * Otherwise set it to max(1/200, 1/hz). 2613 * Enable timeouts iff some device is open. 2614 */ 2615 untimeout(comwakeup, (void *)NULL, sio_timeout_handle); 2616 sio_timeout = hz; 2617 someopen = FALSE; 2618 for (unit = 0; unit < sio_numunits; ++unit) { 2619 com = com_addr(unit); 2620 if (com != NULL && com->tp != NULL 2621 && com->tp->t_state & TS_ISOPEN && !com->gone) { 2622 someopen = TRUE; 2623 if (com->poll || com->poll_output) { 2624 sio_timeout = hz > 200 ? hz / 200 : 1; 2625 break; 2626 } 2627 } 2628 } 2629 if (someopen) { 2630 sio_timeouts_until_log = hz / sio_timeout; 2631 sio_timeout_handle = timeout(comwakeup, (void *)NULL, 2632 sio_timeout); 2633 } else { 2634 /* Flush error messages, if any. */ 2635 sio_timeouts_until_log = 1; 2636 comwakeup((void *)NULL); 2637 untimeout(comwakeup, (void *)NULL, sio_timeout_handle); 2638 } 2639} 2640 2641static void 2642comwakeup(chan) 2643 void *chan; 2644{ 2645 struct com_s *com; 2646 int unit; 2647 2648 sio_timeout_handle = timeout(comwakeup, (void *)NULL, sio_timeout); 2649 2650 /* 2651 * Recover from lost output interrupts. 2652 * Poll any lines that don't use interrupts. 2653 */ 2654 for (unit = 0; unit < sio_numunits; ++unit) { 2655 com = com_addr(unit); 2656 if (com != NULL && !com->gone 2657 && (com->state >= (CS_BUSY | CS_TTGO) || com->poll)) { 2658 mtx_lock_spin(&sio_lock); 2659 siointr1(com); 2660 mtx_unlock_spin(&sio_lock); 2661 } 2662 } 2663 2664 /* 2665 * Check for and log errors, but not too often. 2666 */ 2667 if (--sio_timeouts_until_log > 0) 2668 return; 2669 sio_timeouts_until_log = hz / sio_timeout; 2670 for (unit = 0; unit < sio_numunits; ++unit) { 2671 int errnum; 2672 2673 com = com_addr(unit); 2674 if (com == NULL) 2675 continue; 2676 if (com->gone) 2677 continue; 2678 for (errnum = 0; errnum < CE_NTYPES; ++errnum) { 2679 u_int delta; 2680 u_long total; 2681 2682 mtx_lock_spin(&sio_lock); 2683 delta = com->delta_error_counts[errnum]; 2684 com->delta_error_counts[errnum] = 0; 2685 mtx_unlock_spin(&sio_lock); 2686 if (delta == 0) 2687 continue; 2688 total = com->error_counts[errnum] += delta; 2689 log(LOG_ERR, "sio%d: %u more %s%s (total %lu)\n", 2690 unit, delta, error_desc[errnum], 2691 delta == 1 ? "" : "s", total); 2692 } 2693 } 2694} 2695 2696/* 2697 * Following are all routines needed for SIO to act as console 2698 */ 2699struct siocnstate { 2700 u_char dlbl; 2701 u_char dlbh; 2702 u_char ier; 2703 u_char cfcr; 2704 u_char mcr; 2705}; 2706 2707/* 2708 * This is a function in order to not replicate "ttyd%d" more 2709 * places than absolutely necessary. 2710 */ 2711static void 2712siocnset(struct consdev *cd, int unit) 2713{ 2714 2715 cd->cn_unit = unit; 2716 sprintf(cd->cn_name, "ttyd%d", unit); 2717} 2718 2719#ifndef __alpha__ 2720static speed_t siocngetspeed(Port_t, u_long rclk); 2721#endif 2722static void siocnclose(struct siocnstate *sp, Port_t iobase); 2723static void siocnopen(struct siocnstate *sp, Port_t iobase, int speed); 2724static void siocntxwait(Port_t iobase); 2725 2726#ifdef __alpha__ 2727int siocnattach(int port, int speed); 2728int siogdbattach(int port, int speed); 2729int siogdbgetc(void); 2730void siogdbputc(int c); 2731#else 2732static cn_probe_t siocnprobe; 2733static cn_init_t siocninit; 2734static cn_term_t siocnterm; 2735#endif 2736static cn_checkc_t siocncheckc; 2737static cn_getc_t siocngetc; 2738static cn_putc_t siocnputc; 2739 2740#ifndef __alpha__ 2741CONS_DRIVER(sio, siocnprobe, siocninit, siocnterm, siocngetc, siocncheckc, 2742 siocnputc, NULL); 2743#endif 2744 2745#if DDB > 0 2746static struct consdev gdbconsdev; 2747#endif 2748 2749static void 2750siocntxwait(iobase) 2751 Port_t iobase; 2752{ 2753 int timo; 2754 2755 /* 2756 * Wait for any pending transmission to finish. Required to avoid 2757 * the UART lockup bug when the speed is changed, and for normal 2758 * transmits. 2759 */ 2760 timo = 100000; 2761 while ((inb(iobase + com_lsr) & (LSR_TSRE | LSR_TXRDY)) 2762 != (LSR_TSRE | LSR_TXRDY) && --timo != 0) 2763 ; 2764} 2765 2766#ifndef __alpha__ 2767 2768/* 2769 * Read the serial port specified and try to figure out what speed 2770 * it's currently running at. We're assuming the serial port has 2771 * been initialized and is basicly idle. This routine is only intended 2772 * to be run at system startup. 2773 * 2774 * If the value read from the serial port doesn't make sense, return 0. 2775 */ 2776 2777static speed_t 2778siocngetspeed(iobase, rclk) 2779 Port_t iobase; 2780 u_long rclk; 2781{ 2782 u_int divisor; 2783 u_char dlbh; 2784 u_char dlbl; 2785 u_char cfcr; 2786 2787 cfcr = inb(iobase + com_cfcr); 2788 outb(iobase + com_cfcr, CFCR_DLAB | cfcr); 2789 2790 dlbl = inb(iobase + com_dlbl); 2791 dlbh = inb(iobase + com_dlbh); 2792 2793 outb(iobase + com_cfcr, cfcr); 2794 2795 divisor = dlbh << 8 | dlbl; 2796 2797 /* XXX there should be more sanity checking. */ 2798 if (divisor == 0) 2799 return (CONSPEED); 2800 return (rclk / (16UL * divisor)); 2801} 2802 2803#endif 2804 2805static void 2806siocnopen(sp, iobase, speed) 2807 struct siocnstate *sp; 2808 Port_t iobase; 2809 int speed; 2810{ 2811 u_int divisor; 2812 u_char dlbh; 2813 u_char dlbl; 2814 2815 /* 2816 * Save all the device control registers except the fifo register 2817 * and set our default ones (cs8 -parenb speed=comdefaultrate). 2818 * We can't save the fifo register since it is read-only. 2819 */ 2820 sp->ier = inb(iobase + com_ier); 2821 outb(iobase + com_ier, 0); /* spltty() doesn't stop siointr() */ 2822 siocntxwait(iobase); 2823 sp->cfcr = inb(iobase + com_cfcr); 2824 outb(iobase + com_cfcr, CFCR_DLAB | CFCR_8BITS); 2825 sp->dlbl = inb(iobase + com_dlbl); 2826 sp->dlbh = inb(iobase + com_dlbh); 2827 /* 2828 * Only set the divisor registers if they would change, since on 2829 * some 16550 incompatibles (Startech), setting them clears the 2830 * data input register. This also reduces the effects of the 2831 * UMC8669F bug. 2832 */ 2833 divisor = siodivisor(comdefaultrclk, speed); 2834 dlbl = divisor & 0xFF; 2835 if (sp->dlbl != dlbl) 2836 outb(iobase + com_dlbl, dlbl); 2837 dlbh = divisor >> 8; 2838 if (sp->dlbh != dlbh) 2839 outb(iobase + com_dlbh, dlbh); 2840 outb(iobase + com_cfcr, CFCR_8BITS); 2841 sp->mcr = inb(iobase + com_mcr); 2842 /* 2843 * We don't want interrupts, but must be careful not to "disable" 2844 * them by clearing the MCR_IENABLE bit, since that might cause 2845 * an interrupt by floating the IRQ line. 2846 */ 2847 outb(iobase + com_mcr, (sp->mcr & MCR_IENABLE) | MCR_DTR | MCR_RTS); 2848} 2849 2850static void 2851siocnclose(sp, iobase) 2852 struct siocnstate *sp; 2853 Port_t iobase; 2854{ 2855 /* 2856 * Restore the device control registers. 2857 */ 2858 siocntxwait(iobase); 2859 outb(iobase + com_cfcr, CFCR_DLAB | CFCR_8BITS); 2860 if (sp->dlbl != inb(iobase + com_dlbl)) 2861 outb(iobase + com_dlbl, sp->dlbl); 2862 if (sp->dlbh != inb(iobase + com_dlbh)) 2863 outb(iobase + com_dlbh, sp->dlbh); 2864 outb(iobase + com_cfcr, sp->cfcr); 2865 /* 2866 * XXX damp oscillations of MCR_DTR and MCR_RTS by not restoring them. 2867 */ 2868 outb(iobase + com_mcr, sp->mcr | MCR_DTR | MCR_RTS); 2869 outb(iobase + com_ier, sp->ier); 2870} 2871 2872#ifndef __alpha__ 2873 2874static void 2875siocnprobe(cp) 2876 struct consdev *cp; 2877{ 2878 speed_t boot_speed; 2879 u_char cfcr; 2880 u_int divisor; 2881 int s, unit; 2882 struct siocnstate sp; 2883 2884 /* 2885 * Find our first enabled console, if any. If it is a high-level 2886 * console device, then initialize it and return successfully. 2887 * If it is a low-level console device, then initialize it and 2888 * return unsuccessfully. It must be initialized in both cases 2889 * for early use by console drivers and debuggers. Initializing 2890 * the hardware is not necessary in all cases, since the i/o 2891 * routines initialize it on the fly, but it is necessary if 2892 * input might arrive while the hardware is switched back to an 2893 * uninitialized state. We can't handle multiple console devices 2894 * yet because our low-level routines don't take a device arg. 2895 * We trust the user to set the console flags properly so that we 2896 * don't need to probe. 2897 */ 2898 cp->cn_pri = CN_DEAD; 2899 2900 for (unit = 0; unit < 16; unit++) { /* XXX need to know how many */ 2901 int flags; 2902 2903 if (resource_disabled("sio", unit)) 2904 continue; 2905 if (resource_int_value("sio", unit, "flags", &flags)) 2906 continue; 2907 if (COM_CONSOLE(flags) || COM_DEBUGGER(flags)) { 2908 int port; 2909 Port_t iobase; 2910 2911 if (resource_int_value("sio", unit, "port", &port)) 2912 continue; 2913 iobase = port; 2914 s = spltty(); 2915 if (boothowto & RB_SERIAL) { 2916 boot_speed = 2917 siocngetspeed(iobase, comdefaultrclk); 2918 if (boot_speed) 2919 comdefaultrate = boot_speed; 2920 } 2921 2922 /* 2923 * Initialize the divisor latch. We can't rely on 2924 * siocnopen() to do this the first time, since it 2925 * avoids writing to the latch if the latch appears 2926 * to have the correct value. Also, if we didn't 2927 * just read the speed from the hardware, then we 2928 * need to set the speed in hardware so that 2929 * switching it later is null. 2930 */ 2931 cfcr = inb(iobase + com_cfcr); 2932 outb(iobase + com_cfcr, CFCR_DLAB | cfcr); 2933 divisor = siodivisor(comdefaultrclk, comdefaultrate); 2934 outb(iobase + com_dlbl, divisor & 0xff); 2935 outb(iobase + com_dlbh, divisor >> 8); 2936 outb(iobase + com_cfcr, cfcr); 2937 2938 siocnopen(&sp, iobase, comdefaultrate); 2939 2940 splx(s); 2941 if (COM_CONSOLE(flags) && !COM_LLCONSOLE(flags)) { 2942 siocnset(cp, unit); 2943 cp->cn_pri = COM_FORCECONSOLE(flags) 2944 || boothowto & RB_SERIAL 2945 ? CN_REMOTE : CN_NORMAL; 2946 siocniobase = iobase; 2947 siocnunit = unit; 2948 } 2949 if (COM_DEBUGGER(flags)) { 2950 printf("sio%d: gdb debugging port\n", unit); 2951 siogdbiobase = iobase; 2952 siogdbunit = unit; 2953#if DDB > 0 2954 siocnset(&gdbconsdev, unit); 2955 gdb_arg = &gdbconsdev; 2956 gdb_getc = siocngetc; 2957 gdb_putc = siocnputc; 2958#endif 2959 } 2960 } 2961 } 2962#ifdef __i386__ 2963#if DDB > 0 2964 /* 2965 * XXX Ugly Compatability. 2966 * If no gdb port has been specified, set it to be the console 2967 * as some configuration files don't specify the gdb port. 2968 */ 2969 if (gdb_arg == NULL && (boothowto & RB_GDB)) { 2970 printf("Warning: no GDB port specified. Defaulting to sio%d.\n", 2971 siocnunit); 2972 printf("Set flag 0x80 on desired GDB port in your\n"); 2973 printf("configuration file (currently sio only).\n"); 2974 siogdbiobase = siocniobase; 2975 siogdbunit = siocnunit; 2976 siocnset(&gdbconsdev, siocnunit); 2977 gdb_arg = &gdbconsdev; 2978 gdb_getc = siocngetc; 2979 gdb_putc = siocnputc; 2980 } 2981#endif 2982#endif 2983} 2984 2985static void 2986siocninit(cp) 2987 struct consdev *cp; 2988{ 2989 comconsole = cp->cn_unit; 2990} 2991 2992static void 2993siocnterm(cp) 2994 struct consdev *cp; 2995{ 2996 comconsole = -1; 2997} 2998 2999#endif 3000 3001#ifdef __alpha__ 3002 3003CONS_DRIVER(sio, NULL, NULL, NULL, siocngetc, siocncheckc, siocnputc, NULL); 3004 3005int 3006siocnattach(port, speed) 3007 int port; 3008 int speed; 3009{ 3010 int s; 3011 u_char cfcr; 3012 u_int divisor; 3013 struct siocnstate sp; 3014 int unit = 0; /* XXX random value! */ 3015 3016 siocniobase = port; 3017 siocnunit = unit; 3018 comdefaultrate = speed; 3019 sio_consdev.cn_pri = CN_NORMAL; 3020 siocnset(&sio_consdev, unit); 3021 3022 s = spltty(); 3023 3024 /* 3025 * Initialize the divisor latch. We can't rely on 3026 * siocnopen() to do this the first time, since it 3027 * avoids writing to the latch if the latch appears 3028 * to have the correct value. Also, if we didn't 3029 * just read the speed from the hardware, then we 3030 * need to set the speed in hardware so that 3031 * switching it later is null. 3032 */ 3033 cfcr = inb(siocniobase + com_cfcr); 3034 outb(siocniobase + com_cfcr, CFCR_DLAB | cfcr); 3035 divisor = siodivisor(comdefaultrclk, comdefaultrate); 3036 outb(siocniobase + com_dlbl, divisor & 0xff); 3037 outb(siocniobase + com_dlbh, divisor >> 8); 3038 outb(siocniobase + com_cfcr, cfcr); 3039 3040 siocnopen(&sp, siocniobase, comdefaultrate); 3041 splx(s); 3042 3043 cnadd(&sio_consdev); 3044 return (0); 3045} 3046 3047int 3048siogdbattach(port, speed) 3049 int port; 3050 int speed; 3051{ 3052 int s; 3053 u_char cfcr; 3054 u_int divisor; 3055 struct siocnstate sp; 3056 int unit = 1; /* XXX random value! */ 3057 3058 siogdbiobase = port; 3059 gdbdefaultrate = speed; 3060 3061 printf("sio%d: gdb debugging port\n", unit); 3062 siogdbunit = unit; 3063#if DDB > 0 3064 siocnset(&gdbconsdev, unit); 3065 gdb_arg = &gdbconsdev; 3066 gdb_getc = siocngetc; 3067 gdb_putc = siocnputc; 3068#endif 3069 3070 s = spltty(); 3071 3072 /* 3073 * Initialize the divisor latch. We can't rely on 3074 * siocnopen() to do this the first time, since it 3075 * avoids writing to the latch if the latch appears 3076 * to have the correct value. Also, if we didn't 3077 * just read the speed from the hardware, then we 3078 * need to set the speed in hardware so that 3079 * switching it later is null. 3080 */ 3081 cfcr = inb(siogdbiobase + com_cfcr); 3082 outb(siogdbiobase + com_cfcr, CFCR_DLAB | cfcr); 3083 divisor = siodivisor(comdefaultrclk, gdbdefaultrate); 3084 outb(siogdbiobase + com_dlbl, divisor & 0xff); 3085 outb(siogdbiobase + com_dlbh, divisor >> 8); 3086 outb(siogdbiobase + com_cfcr, cfcr); 3087 3088 siocnopen(&sp, siogdbiobase, gdbdefaultrate); 3089 splx(s); 3090 3091 return (0); 3092} 3093 3094#endif 3095 3096static int 3097siocncheckc(struct consdev *cd) 3098{ 3099 int c; 3100 Port_t iobase; 3101 int s; 3102 struct siocnstate sp; 3103 speed_t speed; 3104 3105 if (cd->cn_unit == siocnunit) { 3106 iobase = siocniobase; 3107 speed = comdefaultrate; 3108 } else { 3109 iobase = siogdbiobase; 3110 speed = gdbdefaultrate; 3111 } 3112 s = spltty(); 3113 siocnopen(&sp, iobase, speed); 3114 if (inb(iobase + com_lsr) & LSR_RXRDY) 3115 c = inb(iobase + com_data); 3116 else 3117 c = -1; 3118 siocnclose(&sp, iobase); 3119 splx(s); 3120 return (c); 3121} 3122 3123static int 3124siocngetc(struct consdev *cd) 3125{ 3126 int c; 3127 Port_t iobase; 3128 int s; 3129 struct siocnstate sp; 3130 speed_t speed; 3131 3132 if (cd->cn_unit == siocnunit) { 3133 iobase = siocniobase; 3134 speed = comdefaultrate; 3135 } else { 3136 iobase = siogdbiobase; 3137 speed = gdbdefaultrate; 3138 } 3139 s = spltty(); 3140 siocnopen(&sp, iobase, speed); 3141 while (!(inb(iobase + com_lsr) & LSR_RXRDY)) 3142 ; 3143 c = inb(iobase + com_data); 3144 siocnclose(&sp, iobase); 3145 splx(s); 3146 return (c); 3147} 3148 3149static void 3150siocnputc(struct consdev *cd, int c) 3151{ 3152 int need_unlock; 3153 int s; 3154 struct siocnstate sp; 3155 Port_t iobase; 3156 speed_t speed; 3157 3158 if (cd->cn_unit == siocnunit) { 3159 iobase = siocniobase; 3160 speed = comdefaultrate; 3161 } else { 3162 iobase = siogdbiobase; 3163 speed = gdbdefaultrate; 3164 } 3165 s = spltty(); 3166 need_unlock = 0; 3167 if (sio_inited == 2 && !mtx_owned(&sio_lock)) { 3168 mtx_lock_spin(&sio_lock); 3169 need_unlock = 1; 3170 } 3171 siocnopen(&sp, iobase, speed); 3172 siocntxwait(iobase); 3173 outb(iobase + com_data, c); 3174 siocnclose(&sp, iobase); 3175 if (need_unlock) 3176 mtx_unlock_spin(&sio_lock); 3177 splx(s); 3178} 3179 3180#ifdef __alpha__ 3181int 3182siogdbgetc() 3183{ 3184 int c; 3185 Port_t iobase; 3186 speed_t speed; 3187 int s; 3188 struct siocnstate sp; 3189 3190 if (siogdbunit == siocnunit) { 3191 iobase = siocniobase; 3192 speed = comdefaultrate; 3193 } else { 3194 iobase = siogdbiobase; 3195 speed = gdbdefaultrate; 3196 } 3197 3198 s = spltty(); 3199 siocnopen(&sp, iobase, speed); 3200 while (!(inb(iobase + com_lsr) & LSR_RXRDY)) 3201 ; 3202 c = inb(iobase + com_data); 3203 siocnclose(&sp, iobase); 3204 splx(s); 3205 return (c); 3206} 3207 3208void 3209siogdbputc(c) 3210 int c; 3211{ 3212 Port_t iobase; 3213 speed_t speed; 3214 int s; 3215 struct siocnstate sp; 3216 3217 if (siogdbunit == siocnunit) { 3218 iobase = siocniobase; 3219 speed = comdefaultrate; 3220 } else { 3221 iobase = siogdbiobase; 3222 speed = gdbdefaultrate; 3223 } 3224 3225 s = spltty(); 3226 siocnopen(&sp, iobase, speed); 3227 siocntxwait(siogdbiobase); 3228 outb(siogdbiobase + com_data, c); 3229 siocnclose(&sp, siogdbiobase); 3230 splx(s); 3231} 3232#endif 3233