root/dev/ic/com.c

DEFINITIONS

1. comspeed
2. comprobe1
3. com_detach
4. com_activate
5. comopen
6. comclose
7. compwroff
8. com_raisedtr
9. comread
10. comwrite
11. comtty
12. tiocm_xxx2mcr
13. comioctl
14. comparam
15. comstart
16. comstop
17. comdiag
18. comsoft
19. kgdbintr
20. comintr
21. com_common_getc
22. com_common_putc
23. cominit
24. comcnprobe
25. comcninit
26. comcnattach
27. comcngetc
28. comcnputc
29. comcnpollc
30. com_kgdb_attach
31. com_kgdb_getc
32. com_kgdb_putc
33. com_is_console

    1 /*      $OpenBSD: com.c,v 1.117 2007/07/15 19:25:49 kettenis Exp $      */
    2 /*      $NetBSD: com.c,v 1.82.4.1 1996/06/02 09:08:00 mrg Exp $ */
    4 /*
    5  * Copyright (c) 1997 - 1999, Jason Downs.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS
   17  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   18  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   19  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT,
   20  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   21  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   22  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
   23  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 /*-
   29  * Copyright (c) 1993, 1994, 1995, 1996
   30  *      Charles M. Hannum.  All rights reserved.
   31  * Copyright (c) 1991 The Regents of the University of California.
   32  * All rights reserved.
   33  *
   34  * Redistribution and use in source and binary forms, with or without
   35  * modification, are permitted provided that the following conditions
   36  * are met:
   37  * 1. Redistributions of source code must retain the above copyright
   38  *    notice, this list of conditions and the following disclaimer.
   39  * 2. Redistributions in binary form must reproduce the above copyright
   40  *    notice, this list of conditions and the following disclaimer in the
   41  *    documentation and/or other materials provided with the distribution.
   42  * 3. Neither the name of the University nor the names of its contributors
   43  *    may be used to endorse or promote products derived from this software
   44  *    without specific prior written permission.
   45  *
   46  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   47  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   48  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   49  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   50  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   51  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   52  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   53  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   54  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   55  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   56  * SUCH DAMAGE.
   57  *
   58  *      @(#)com.c       7.5 (Berkeley) 5/16/91
   59  */
   61 /*
   62  * COM driver, based on HP dca driver
   63  * uses National Semiconductor NS16450/NS16550AF UART
   64  */
   65 #include <sys/param.h>
   66 #include <sys/systm.h>
   67 #include <sys/ioctl.h>
   68 #include <sys/selinfo.h>
   69 #include <sys/tty.h>
   70 #include <sys/proc.h>
   71 #include <sys/user.h>
   72 #include <sys/conf.h>
   73 #include <sys/file.h>
   74 #include <sys/uio.h>
   75 #include <sys/kernel.h>
   76 #include <sys/syslog.h>
   77 #include <sys/device.h>
   78 #include <sys/vnode.h>
   79 #ifdef DDB
   80 #include <ddb/db_var.h>
   81 #endif
   83 #include <machine/bus.h>
   84 #if defined(__sparc64__) || !defined(__sparc__)
   85 #include <machine/intr.h>
   86 #endif
   88 #if !defined(__sparc__) || defined(__sparc64__)
   89 #define COM_CONSOLE
   90 #include <dev/cons.h>
   91 #endif
   93 #include <dev/ic/comreg.h>
   94 #include <dev/ic/comvar.h>
   95 #include <dev/ic/ns16550reg.h>
   96 #define com_lcr com_cfcr
   98 #ifdef COM_PXA2X0
   99 #define com_isr 8
  100 #define ISR_SEND        (ISR_RXPL | ISR_XMODE | ISR_XMITIR)
  101 #define ISR_RECV        (ISR_RXPL | ISR_XMODE | ISR_RCVEIR)
  102 #endif
  104 #ifdef __zaurus__
  105 #include <arch/zaurus/dev/zaurus_scoopvar.h>
  106 #endif
  108 /* XXX: These belong elsewhere */
cdev_decl(com);
  111 static u_char tiocm_xxx2mcr(int);
  113 void    compwroff(struct com_softc *);
  114 void    cominit(bus_space_tag_t, bus_space_handle_t, int, int);
  115 int     com_is_console(bus_space_tag_t, bus_addr_t);
  117 struct cfdriver com_cd = {
NULL, "com", DV_TTY
  119 };
  121 int     comdefaultrate = TTYDEF_SPEED;
  122 #ifdef COM_PXA2X0
bus_addr_t comsiraddr;
  124 #endif
  125 #ifdef COM_CONSOLE
  126 int     comconsfreq;
  127 int     comconsinit;
bus_addr_t comconsaddr;
  129 int     comconsattached;
bus_space_tag_t comconsiot;
bus_space_handle_t comconsioh;
tcflag_t comconscflag = TTYDEF_CFLAG;
  133 #endif
  135 int     commajor;
  137 #ifdef KGDB
  138 #include <sys/kgdb.h>
bus_addr_t com_kgdb_addr;
bus_space_tag_t com_kgdb_iot;
bus_space_handle_t com_kgdb_ioh;
  144 int    com_kgdb_getc(void *);
  145 void   com_kgdb_putc(void *, int);
  146 #endif /* KGDB */
  148 #define DEVUNIT(x)      (minor(x) & 0x7f)
  149 #define DEVCUA(x)       (minor(x) & 0x80)
  151 int
comspeed(long freq, long speed)
  153 {
  154 #define divrnd(n, q)    (((n)*2/(q)+1)/2)       /* divide and round off */
  156         int x, err;
  158         if (speed == 0)
  159                 return 0;
  160         if (speed < 0)
  161                 return -1;
x = divrnd((freq / 16), speed);
  163         if (x <= 0)
  164                 return -1;
err = divrnd((quad_t)freq * 1000 / 16, speed * x) - 1000;
  166         if (err < 0)
err = -err;
  168         if (err > COM_TOLERANCE)
  169                 return -1;
  170         return x;
  172 #undef  divrnd
  173 }
  175 #ifdef COM_CONSOLE
  176 int
comprobe1(bus_space_tag_t iot, bus_space_handle_t ioh)
  178 {
  179         int i, k;
  181         /* force access to id reg */
bus_space_write_1(iot, ioh, com_lcr, 0);
bus_space_write_1(iot, ioh, com_iir, 0);
  184         for (i = 0; i < 32; i++) {
k = bus_space_read_1(iot, ioh, com_iir);
  186                 if (k & 0x38) {
bus_space_read_1(iot, ioh, com_data); /* cleanup */
  188                 } else
  189                         break;
  190         }
  191         if (i >= 32)
  192                 return 0;
  194         return 1;
  195 }
  196 #endif
  198 int
com_detach(struct device *self, int flags)
  200 {
  201         struct com_softc *sc = (struct com_softc *)self;
  202         int maj, mn;
sc->sc_swflags |= COM_SW_DEAD;
  206         /* locate the major number */
  207         for (maj = 0; maj < nchrdev; maj++)
  208                 if (cdevsw[maj].d_open == comopen)
  209                         break;
  211         /* Nuke the vnodes for any open instances. */
mn = self->dv_unit;
vdevgone(maj, mn, mn, VCHR);
  215         /* XXX a symbolic constant for the cua bit would be nicer. */
mn |= 0x80;
vdevgone(maj, mn, mn, VCHR);
  219         /* Detach and free the tty. */
  220         if (sc->sc_tty) {
ttyfree(sc->sc_tty);
  222         }
timeout_del(&sc->sc_dtr_tmo);
timeout_del(&sc->sc_diag_tmo);
  226 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS
softintr_disestablish(sc->sc_si);
  228 #else
timeout_del(&sc->sc_comsoft_tmo);
  230 #endif
  232         return (0);
  233 }
  235 int
com_activate(struct device *self, enum devact act)
  237 {
  238         struct com_softc *sc = (struct com_softc *)self;
  239         int s, rv = 0;
s = spltty();
  242         switch (act) {
  243         case DVACT_ACTIVATE:
  244                 break;
  246         case DVACT_DEACTIVATE:
  247 #ifdef KGDB
  248                 if (sc->sc_hwflags & (COM_HW_CONSOLE|COM_HW_KGDB)) {
  249 #else
  250                 if (sc->sc_hwflags & COM_HW_CONSOLE) {
  251 #endif /* KGDB */
rv = EBUSY;
  253                         break;
  254                 }
  256                 if (sc->disable != NULL && sc->enabled != 0) {
  257                         (*sc->disable)(sc);
sc->enabled = 0;
  259                 }
  260                 break;
  261         }
splx(s);
  263         return (rv);
  264 }
  266 int
comopen(dev_t dev, int flag, int mode, struct proc *p)
  268 {
  269         int unit = DEVUNIT(dev);
  270         struct com_softc *sc;
bus_space_tag_t iot;
bus_space_handle_t ioh;
  273         struct tty *tp;
  274         int s;
  275         int error = 0;
  277         if (unit >= com_cd.cd_ndevs)
  278                 return ENXIO;
sc = com_cd.cd_devs[unit];
  280         if (!sc)
  281                 return ENXIO;
  283 #ifdef KGDB
  284         /*
  285          * If this is the kgdb port, no other use is permitted.
  286          */
  287         if (ISSET(sc->sc_hwflags, COM_HW_KGDB))
  288                 return (EBUSY);
  289 #endif /* KGDB */
s = spltty();
  292         if (!sc->sc_tty) {
tp = sc->sc_tty = ttymalloc();
  294         } else
tp = sc->sc_tty;
splx(s);
tp->t_oproc = comstart;
tp->t_param = comparam;
tp->t_dev = dev;
  301         if (!ISSET(tp->t_state, TS_ISOPEN)) {
SET(tp->t_state, TS_WOPEN);
ttychars(tp);
tp->t_iflag = TTYDEF_IFLAG;
tp->t_oflag = TTYDEF_OFLAG;
  306 #ifdef COM_CONSOLE
  307                 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE))
tp->t_cflag = comconscflag;
  309                 else
  310 #endif
tp->t_cflag = TTYDEF_CFLAG;
  312                 if (ISSET(sc->sc_swflags, COM_SW_CLOCAL))
SET(tp->t_cflag, CLOCAL);
  314                 if (ISSET(sc->sc_swflags, COM_SW_CRTSCTS))
SET(tp->t_cflag, CRTSCTS);
  316                 if (ISSET(sc->sc_swflags, COM_SW_MDMBUF))
SET(tp->t_cflag, MDMBUF);
tp->t_lflag = TTYDEF_LFLAG;
tp->t_ispeed = tp->t_ospeed = comdefaultrate;
s = spltty();
sc->sc_initialize = 1;
comparam(tp, &tp->t_termios);
ttsetwater(tp);
  327 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS
timeout_add(&sc->sc_comsoft_tmo, 1);
  329 #endif
sc->sc_ibufp = sc->sc_ibuf = sc->sc_ibufs[0];
sc->sc_ibufhigh = sc->sc_ibuf + COM_IHIGHWATER;
sc->sc_ibufend = sc->sc_ibuf + COM_IBUFSIZE;
iot = sc->sc_iot;
ioh = sc->sc_ioh;
  338                 /*
  339                  * Wake up the sleepy heads.
  340                  */
  341                 switch (sc->sc_uarttype) {
  342                 case COM_UART_ST16650:
  343                 case COM_UART_ST16650V2:
bus_space_write_1(iot, ioh, com_lcr, LCR_EFR);
bus_space_write_1(iot, ioh, com_efr, EFR_ECB);
bus_space_write_1(iot, ioh, com_ier, 0);
bus_space_write_1(iot, ioh, com_efr, 0);
bus_space_write_1(iot, ioh, com_lcr, 0);
  349                         break;
  350                 case COM_UART_TI16750:
bus_space_write_1(iot, ioh, com_ier, 0);
  352                         break;
  353                 case COM_UART_PXA2X0:
bus_space_write_1(iot, ioh, com_ier, IER_EUART);
  355                         break;
  356                 }
  358                 if (ISSET(sc->sc_hwflags, COM_HW_FIFO)) {
u_int8_t fifo = FIFO_ENABLE|FIFO_RCV_RST|FIFO_XMT_RST;
u_int8_t lcr;
  362                         if (tp->t_ispeed <= 1200)
fifo |= FIFO_TRIGGER_1;
  364                         else
fifo |= FIFO_TRIGGER_8;
  366                         if (sc->sc_uarttype == COM_UART_TI16750) {
fifo |= FIFO_ENABLE_64BYTE;
lcr = bus_space_read_1(iot, ioh, com_lcr);
bus_space_write_1(iot, ioh, com_lcr,
lcr | LCR_DLAB);
  371                         }
  373                         /*
  374                          * (Re)enable and drain FIFOs.
  375                          *
  376                          * Certain SMC chips cause problems if the FIFOs are
  377                          * enabled while input is ready. Turn off the FIFO
  378                          * if necessary to clear the input. Test the input
  379                          * ready bit after enabling the FIFOs to handle races
  380                          * between enabling and fresh input.
  381                          *
  382                          * Set the FIFO threshold based on the receive speed.
  383                          */
  384                         for (;;) {
bus_space_write_1(iot, ioh, com_fifo, 0);
delay(100);
  387                                 (void) bus_space_read_1(iot, ioh, com_data);
bus_space_write_1(iot, ioh, com_fifo, fifo |
FIFO_RCV_RST | FIFO_XMT_RST);
delay(100);
  391                                 if(!ISSET(bus_space_read_1(iot, ioh,
com_lsr), LSR_RXRDY))
  393                                         break;
  394                         }
  395                         if (sc->sc_uarttype == COM_UART_TI16750)
bus_space_write_1(iot, ioh, com_lcr, lcr);
  397                 }
  399                 /* flush any pending I/O */
  400                 while (ISSET(bus_space_read_1(iot, ioh, com_lsr), LSR_RXRDY))
  401                         (void) bus_space_read_1(iot, ioh, com_data);
  402                 /* you turn me on, baby */
sc->sc_mcr = MCR_DTR | MCR_RTS;
  404                 if (!ISSET(sc->sc_hwflags, COM_HW_NOIEN))
SET(sc->sc_mcr, MCR_IENABLE);
bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr);
sc->sc_ier = IER_ERXRDY | IER_ERLS | IER_EMSC;
  408 #ifdef COM_PXA2X0
  409                 if (sc->sc_uarttype == COM_UART_PXA2X0)
sc->sc_ier |= IER_EUART | IER_ERXTOUT;
  411 #endif  
bus_space_write_1(iot, ioh, com_ier, sc->sc_ier);
sc->sc_msr = bus_space_read_1(iot, ioh, com_msr);
  415                 if (ISSET(sc->sc_swflags, COM_SW_SOFTCAR) || DEVCUA(dev) ||
ISSET(sc->sc_msr, MSR_DCD) || ISSET(tp->t_cflag, MDMBUF))
SET(tp->t_state, TS_CARR_ON);
  418                 else
CLR(tp->t_state, TS_CARR_ON);
  420 #ifdef COM_PXA2X0
  421                 if (sc->sc_uarttype == COM_UART_PXA2X0 &&
ISSET(sc->sc_hwflags, COM_HW_SIR)) {
bus_space_write_1(iot, ioh, com_isr, ISR_RECV);
  424 #ifdef __zaurus__
scoop_set_irled(1);
  426 #endif
  427                 }
  428 #endif
  429         } else if (ISSET(tp->t_state, TS_XCLUDE) && p->p_ucred->cr_uid != 0)
  430                 return EBUSY;
  431         else
s = spltty();
  434         if (DEVCUA(dev)) {
  435                 if (ISSET(tp->t_state, TS_ISOPEN)) {
  436                         /* Ah, but someone already is dialed in... */
splx(s);
  438                         return EBUSY;
  439                 }
sc->sc_cua = 1;         /* We go into CUA mode */
  441         } else {
  442                 /* tty (not cua) device; wait for carrier if necessary */
  443                 if (ISSET(flag, O_NONBLOCK)) {
  444                         if (sc->sc_cua) {
  445                                 /* Opening TTY non-blocking... but the CUA is busy */
splx(s);
  447                                 return EBUSY;
  448                         }
  449                 } else {
  450                         while (sc->sc_cua ||
  451                             (!ISSET(tp->t_cflag, CLOCAL) &&
  452                                 !ISSET(tp->t_state, TS_CARR_ON))) {
SET(tp->t_state, TS_WOPEN);
error = ttysleep(tp, &tp->t_rawq, TTIPRI | PCATCH, ttopen, 0);
  455                                 /*
  456                                  * If TS_WOPEN has been reset, that means the cua device
  457                                  * has been closed.  We don't want to fail in that case,
  458                                  * so just go around again.
  459                                  */
  460                                 if (error && ISSET(tp->t_state, TS_WOPEN)) {
CLR(tp->t_state, TS_WOPEN);
  462                                         if (!sc->sc_cua && !ISSET(tp->t_state, TS_ISOPEN))
compwroff(sc);
splx(s);
  465                                         return error;
  466                                 }
  467                         }
  468                 }
  469         }
splx(s);
  472         return (*linesw[tp->t_line].l_open)(dev, tp);
  473 }
  475 int
  476 comclose(dev_t dev, int flag, int mode, struct proc *p)
  477 {
  478         int unit = DEVUNIT(dev);
  479         struct com_softc *sc = com_cd.cd_devs[unit];
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
  482         struct tty *tp = sc->sc_tty;
  483         int s;
  485 #ifdef COM_CONSOLE
  486         /* XXX This is for cons.c. */
  487         if (!ISSET(tp->t_state, TS_ISOPEN))
  488                 return 0;
  489 #endif
  491         if(sc->sc_swflags & COM_SW_DEAD)
  492                 return 0;
  494         (*linesw[tp->t_line].l_close)(tp, flag);
s = spltty();
  496         if (ISSET(tp->t_state, TS_WOPEN)) {
  497                 /* tty device is waiting for carrier; drop dtr then re-raise */
CLR(sc->sc_mcr, MCR_DTR | MCR_RTS);
bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr);
timeout_add(&sc->sc_dtr_tmo, hz * 2);
  501         } else {
  502                 /* no one else waiting; turn off the uart */
compwroff(sc);
  504         }
CLR(tp->t_state, TS_BUSY | TS_FLUSH);
  506 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS
timeout_del(&sc->sc_comsoft_tmo);
  508 #endif
sc->sc_cua = 0;
splx(s);
ttyclose(tp);
  513 #ifdef COM_CONSOLE
  514 #ifdef notyet /* XXXX */
  515         if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) {
ttyfree(tp);
sc->sc_tty = 0;
  518         }
  519 #endif
  520 #endif
  521         return 0;
  522 }
  524 void
compwroff(struct com_softc *sc)
  526 {
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
  529         struct tty *tp = sc->sc_tty;
CLR(sc->sc_lcr, LCR_SBREAK);
bus_space_write_1(iot, ioh, com_lcr, sc->sc_lcr);
bus_space_write_1(iot, ioh, com_ier, 0);
  534         if (ISSET(tp->t_cflag, HUPCL) &&
  535             !ISSET(sc->sc_swflags, COM_SW_SOFTCAR)) {
  536                 /* XXX perhaps only clear DTR */
sc->sc_mcr = 0;
bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr);
  539         }
  541         /*
  542          * Turn FIFO off; enter sleep mode if possible.
  543          */
bus_space_write_1(iot, ioh, com_fifo, 0);
delay(100);
  546         (void) bus_space_read_1(iot, ioh, com_data);
delay(100);
bus_space_write_1(iot, ioh, com_fifo,
FIFO_RCV_RST | FIFO_XMT_RST);
  551         switch (sc->sc_uarttype) {
  552         case COM_UART_ST16650:
  553         case COM_UART_ST16650V2:
bus_space_write_1(iot, ioh, com_lcr, LCR_EFR);
bus_space_write_1(iot, ioh, com_efr, EFR_ECB);
bus_space_write_1(iot, ioh, com_ier, IER_SLEEP);
bus_space_write_1(iot, ioh, com_lcr, 0);
  558                 break;
  559         case COM_UART_TI16750:
bus_space_write_1(iot, ioh, com_ier, IER_SLEEP);
  561                 break;
  562 #ifdef COM_PXA2X0
  563         case COM_UART_PXA2X0:
bus_space_write_1(iot, ioh, com_ier, 0);
  565 #ifdef __zaurus__
  566                 if (ISSET(sc->sc_hwflags, COM_HW_SIR))
scoop_set_irled(0);
  568 #endif
  569                 break;
  570 #endif
  571         }
  572 }
  574 void
com_raisedtr(void *arg)
  576 {
  577         struct com_softc *sc = arg;
SET(sc->sc_mcr, MCR_DTR | MCR_RTS);
bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_mcr, sc->sc_mcr);
  581 }
  583 int
  584 comread(dev_t dev, struct uio *uio, int flag)
  585 {
  586         struct com_softc *sc = com_cd.cd_devs[DEVUNIT(dev)];
  587         struct tty *tp = sc->sc_tty;
  589         return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
  590 }
  592 int
  593 comwrite(dev_t dev, struct uio *uio, int flag)
  594 {
  595         struct com_softc *sc = com_cd.cd_devs[DEVUNIT(dev)];
  596         struct tty *tp = sc->sc_tty;
  598         return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
  599 }
  601 struct tty *
  602 comtty(dev_t dev)
  603 {
  604         struct com_softc *sc = com_cd.cd_devs[DEVUNIT(dev)];
  605         struct tty *tp = sc->sc_tty;
  607         return (tp);
  608 }
  610 static u_char
tiocm_xxx2mcr(int data)
  612 {
u_char m = 0;
  615         if (ISSET(data, TIOCM_DTR))
SET(m, MCR_DTR);
  617         if (ISSET(data, TIOCM_RTS))
SET(m, MCR_RTS);
  619         return m;
  620 }
  622 int
  623 comioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p)
  624 {
  625         int unit = DEVUNIT(dev);
  626         struct com_softc *sc = com_cd.cd_devs[unit];
  627         struct tty *tp = sc->sc_tty;
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
  630         int error;
error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p);
  633         if (error >= 0)
  634                 return error;
error = ttioctl(tp, cmd, data, flag, p);
  636         if (error >= 0)
  637                 return error;
  639         switch (cmd) {
  640         case TIOCSBRK:
SET(sc->sc_lcr, LCR_SBREAK);
bus_space_write_1(iot, ioh, com_lcr, sc->sc_lcr);
  643                 break;
  644         case TIOCCBRK:
CLR(sc->sc_lcr, LCR_SBREAK);
bus_space_write_1(iot, ioh, com_lcr, sc->sc_lcr);
  647                 break;
  648         case TIOCSDTR:
SET(sc->sc_mcr, sc->sc_dtr);
bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr);
  651                 break;
  652         case TIOCCDTR:
CLR(sc->sc_mcr, sc->sc_dtr);
bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr);
  655                 break;
  656         case TIOCMSET:
CLR(sc->sc_mcr, MCR_DTR | MCR_RTS);
  658         case TIOCMBIS:
SET(sc->sc_mcr, tiocm_xxx2mcr(*(int *)data));
bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr);
  661                 break;
  662         case TIOCMBIC:
CLR(sc->sc_mcr, tiocm_xxx2mcr(*(int *)data));
bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr);
  665                 break;
  666         case TIOCMGET: {
u_char m;
  668                 int bits = 0;
m = sc->sc_mcr;
  671                 if (ISSET(m, MCR_DTR))
SET(bits, TIOCM_DTR);
  673                 if (ISSET(m, MCR_RTS))
SET(bits, TIOCM_RTS);
m = sc->sc_msr;
  676                 if (ISSET(m, MSR_DCD))
SET(bits, TIOCM_CD);
  678                 if (ISSET(m, MSR_CTS))
SET(bits, TIOCM_CTS);
  680                 if (ISSET(m, MSR_DSR))
SET(bits, TIOCM_DSR);
  682                 if (ISSET(m, MSR_RI | MSR_TERI))
SET(bits, TIOCM_RI);
  684                 if (bus_space_read_1(iot, ioh, com_ier))
SET(bits, TIOCM_LE);
  686                 *(int *)data = bits;
  687                 break;
  688         }
  689         case TIOCGFLAGS: {
  690                 int driverbits, userbits = 0;
driverbits = sc->sc_swflags;
  693                 if (ISSET(driverbits, COM_SW_SOFTCAR))
SET(userbits, TIOCFLAG_SOFTCAR);
  695                 if (ISSET(driverbits, COM_SW_CLOCAL))
SET(userbits, TIOCFLAG_CLOCAL);
  697                 if (ISSET(driverbits, COM_SW_CRTSCTS))
SET(userbits, TIOCFLAG_CRTSCTS);
  699                 if (ISSET(driverbits, COM_SW_MDMBUF))
SET(userbits, TIOCFLAG_MDMBUF);
  701                 if (ISSET(driverbits, COM_SW_PPS))
SET(userbits, TIOCFLAG_PPS);
  704                 *(int *)data = userbits;
  705                 break;
  706         }
  707         case TIOCSFLAGS: {
  708                 int userbits, driverbits = 0;
error = suser(p, 0);
  711                 if (error != 0)
  712                         return(EPERM);
userbits = *(int *)data;
  715                 if (ISSET(userbits, TIOCFLAG_SOFTCAR) ||
ISSET(sc->sc_hwflags, COM_HW_CONSOLE))
SET(driverbits, COM_SW_SOFTCAR);
  718                 if (ISSET(userbits, TIOCFLAG_CLOCAL))
SET(driverbits, COM_SW_CLOCAL);
  720                 if (ISSET(userbits, TIOCFLAG_CRTSCTS))
SET(driverbits, COM_SW_CRTSCTS);
  722                 if (ISSET(userbits, TIOCFLAG_MDMBUF))
SET(driverbits, COM_SW_MDMBUF);
  724                 if (ISSET(userbits, TIOCFLAG_PPS))
SET(driverbits, COM_SW_PPS);
sc->sc_swflags = driverbits;
  728                 break;
  729         }
  730         default:
  731                 return ENOTTY;
  732         }
  734         return 0;
  735 }
  737 /* already called at spltty */
  738 int
comparam(struct tty *tp, struct termios *t)
  740 {
  741         struct com_softc *sc = com_cd.cd_devs[DEVUNIT(tp->t_dev)];
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
  744         int ospeed = comspeed(sc->sc_frequency, t->c_ospeed);
u_char lcr;
tcflag_t oldcflag;
  748         /* check requested parameters */
  749         if (ospeed < 0 || (t->c_ispeed && t->c_ispeed != t->c_ospeed))
  750                 return EINVAL;
lcr = ISSET(sc->sc_lcr, LCR_SBREAK);
  754         switch (ISSET(t->c_cflag, CSIZE)) {
  755         case CS5:
SET(lcr, LCR_5BITS);
  757                 break;
  758         case CS6:
SET(lcr, LCR_6BITS);
  760                 break;
  761         case CS7:
SET(lcr, LCR_7BITS);
  763                 break;
  764         case CS8:
SET(lcr, LCR_8BITS);
  766                 break;
  767         }
  768         if (ISSET(t->c_cflag, PARENB)) {
SET(lcr, LCR_PENAB);
  770                 if (!ISSET(t->c_cflag, PARODD))
SET(lcr, LCR_PEVEN);
  772         }
  773         if (ISSET(t->c_cflag, CSTOPB))
SET(lcr, LCR_STOPB);
sc->sc_lcr = lcr;
  778         if (ospeed == 0) {
CLR(sc->sc_mcr, MCR_DTR);
bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr);
  781         }
  783         /*
  784          * Set the FIFO threshold based on the receive speed, if we are
  785          * changing it.
  786          */
  787         if (sc->sc_initialize || (tp->t_ispeed != t->c_ispeed)) {
sc->sc_initialize = 0;
  790                 if (ospeed != 0) {
  791                         /*
  792                          * Make sure the transmit FIFO is empty before
  793                          * proceeding.  If we don't do this, some revisions
  794                          * of the UART will hang.  Interestingly enough,
  795                          * even if we do this while the last character is
  796                          * still being pushed out, they don't hang.  This
  797                          * seems good enough.
  798                          */
  799                         while (ISSET(tp->t_state, TS_BUSY)) {
  800                                 int error;
  802                                 ++sc->sc_halt;
error = ttysleep(tp, &tp->t_outq,
TTOPRI | PCATCH, "comprm", 0);
  805                                 --sc->sc_halt;
  806                                 if (error) {
comstart(tp);
  808                                         return (error);
  809                                 }
  810                         }
bus_space_write_1(iot, ioh, com_lcr, lcr | LCR_DLAB);
bus_space_write_1(iot, ioh, com_dlbl, ospeed);
bus_space_write_1(iot, ioh, com_dlbh, ospeed >> 8);
bus_space_write_1(iot, ioh, com_lcr, lcr);
SET(sc->sc_mcr, MCR_DTR);
bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr);
  818                 } else
bus_space_write_1(iot, ioh, com_lcr, lcr);
  821                 if (ISSET(sc->sc_hwflags, COM_HW_FIFO)) {
  822                         if (sc->sc_uarttype == COM_UART_TI16750) {
bus_space_write_1(iot, ioh, com_lcr,
lcr | LCR_DLAB);
bus_space_write_1(iot, ioh, com_fifo,
FIFO_ENABLE | FIFO_ENABLE_64BYTE |
  827                                     (t->c_ispeed <= 1200 ? FIFO_TRIGGER_1 : FIFO_TRIGGER_8));
bus_space_write_1(iot, ioh, com_lcr, lcr);
  829                         } else
bus_space_write_1(iot, ioh, com_fifo,
FIFO_ENABLE |
  832                                     (t->c_ispeed <= 1200 ? FIFO_TRIGGER_1 : FIFO_TRIGGER_8));
  833                 }
  834         } else
bus_space_write_1(iot, ioh, com_lcr, lcr);
  837         /* When not using CRTSCTS, RTS follows DTR. */
  838         if (!ISSET(t->c_cflag, CRTSCTS)) {
  839                 if (ISSET(sc->sc_mcr, MCR_DTR)) {
  840                         if (!ISSET(sc->sc_mcr, MCR_RTS)) {
SET(sc->sc_mcr, MCR_RTS);
bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr);
  843                         }
  844                 } else {
  845                         if (ISSET(sc->sc_mcr, MCR_RTS)) {
CLR(sc->sc_mcr, MCR_RTS);
bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr);
  848                         }
  849                 }
sc->sc_dtr = MCR_DTR | MCR_RTS;
  851         } else
sc->sc_dtr = MCR_DTR;
  854         /* and copy to tty */
tp->t_ispeed = t->c_ispeed;
tp->t_ospeed = t->c_ospeed;
oldcflag = tp->t_cflag;
tp->t_cflag = t->c_cflag;
  860         /*
  861          * If DCD is off and MDMBUF is changed, ask the tty layer if we should
  862          * stop the device.
  863          */
  864         if (!ISSET(sc->sc_msr, MSR_DCD) &&
  865             !ISSET(sc->sc_swflags, COM_SW_SOFTCAR) &&
ISSET(oldcflag, MDMBUF) != ISSET(tp->t_cflag, MDMBUF) &&
  867             (*linesw[tp->t_line].l_modem)(tp, 0) == 0) {
CLR(sc->sc_mcr, sc->sc_dtr);
bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr);
  870         }
  872         /* Just to be sure... */
comstart(tp);
  874         return 0;
  875 }
  877 void
comstart(struct tty *tp)
  879 {
  880         struct com_softc *sc = com_cd.cd_devs[DEVUNIT(tp->t_dev)];
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
  883         int s;
s = spltty();
  886         if (ISSET(tp->t_state, TS_BUSY))
  887                 goto out;
  888         if (ISSET(tp->t_state, TS_TIMEOUT | TS_TTSTOP) || sc->sc_halt > 0)
  889                 goto stopped;
  890         if (ISSET(tp->t_cflag, CRTSCTS) && !ISSET(sc->sc_msr, MSR_CTS))
  891                 goto stopped;
  892         if (tp->t_outq.c_cc <= tp->t_lowat) {
  893                 if (ISSET(tp->t_state, TS_ASLEEP)) {
CLR(tp->t_state, TS_ASLEEP);
wakeup(&tp->t_outq);
  896                 }
  897                 if (tp->t_outq.c_cc == 0)
  898                         goto stopped;
selwakeup(&tp->t_wsel);
  900         }
SET(tp->t_state, TS_BUSY);
  903 #ifdef COM_PXA2X0
  904         /* Enable transmitter slow infrared mode. */
  905         if (sc->sc_uarttype == COM_UART_PXA2X0 &&
ISSET(sc->sc_hwflags, COM_HW_SIR))
bus_space_write_1(iot, ioh, com_isr, ISR_SEND);
  908 #endif
  910         /* Enable transmit completion interrupts. */
  911         if (!ISSET(sc->sc_ier, IER_ETXRDY)) {
SET(sc->sc_ier, IER_ETXRDY);
bus_space_write_1(iot, ioh, com_ier, sc->sc_ier);
  914         }
  916         if (ISSET(sc->sc_hwflags, COM_HW_FIFO)) {
u_char buffer[64];      /* XXX: largest fifo */
  919                 int n = q_to_b(&tp->t_outq, buffer, sc->sc_fifolen);
  920                 int i;
  922                 for (i = 0; i < n; i++) {
bus_space_write_1(iot, ioh, com_data, buffer[i]);
  924                 }
  925         } else if (tp->t_outq.c_cc != 0)
bus_space_write_1(iot, ioh, com_data, getc(&tp->t_outq));
out:
splx(s);
  929         return;
stopped:
  931         if (ISSET(sc->sc_ier, IER_ETXRDY)) {
CLR(sc->sc_ier, IER_ETXRDY);
bus_space_write_1(iot, ioh, com_ier, sc->sc_ier);
  934 #ifdef COM_PXA2X0
  935                 if (sc->sc_uarttype == COM_UART_PXA2X0 &&
ISSET(sc->sc_hwflags, COM_HW_SIR)) {
  937                         int timo;
  939                         /* Wait for empty transmit shift register. */
timo = 20000;
  941                         while (!ISSET(bus_space_read_1(iot, ioh, com_lsr),
LSR_TSRE) && --timo)
delay(1);
  945                         /* Enable receiver slow infrared mode. */
bus_space_write_1(iot, ioh, com_isr, ISR_RECV);
  947                 }
  948 #endif
  949         }
splx(s);
  951 }
  953 /*
  954  * Stop output on a line.
  955  */
  956 int
comstop(struct tty *tp, int flag)
  958 {
  959         int s;
s = spltty();
  962         if (ISSET(tp->t_state, TS_BUSY))
  963                 if (!ISSET(tp->t_state, TS_TTSTOP))
SET(tp->t_state, TS_FLUSH);
splx(s);
  966         return 0;
  967 }
  969 void
comdiag(void *arg)
  971 {
  972         struct com_softc *sc = arg;
  973         int overflows, floods;
  974         int s;
s = spltty();
sc->sc_errors = 0;
overflows = sc->sc_overflows;
sc->sc_overflows = 0;
floods = sc->sc_floods;
sc->sc_floods = 0;
splx(s);
log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf overflow%s\n",
sc->sc_dev.dv_xname,
overflows, overflows == 1 ? "" : "s",
floods, floods == 1 ? "" : "s");
  987 }
  989 void
comsoft(void *arg)
  991 {
  992         struct com_softc *sc = (struct com_softc *)arg;
  993         struct tty *tp;
u_char *ibufp;
u_char *ibufend;
  996         int c;
  997         int s;
  998         static int lsrmap[8] = {
  999                 0,      TTY_PE,
TTY_FE, TTY_PE|TTY_FE,
TTY_FE, TTY_PE|TTY_FE,
TTY_FE, TTY_PE|TTY_FE
 1003         };
 1005         if (sc == NULL || sc->sc_ibufp == sc->sc_ibuf)
 1006                 goto out;
tp = sc->sc_tty;
s = spltty();
ibufp = sc->sc_ibuf;
ibufend = sc->sc_ibufp;
 1015         if (ibufp == ibufend) {
splx(s);
 1017                 goto out;
 1018         }
sc->sc_ibufp = sc->sc_ibuf = (ibufp == sc->sc_ibufs[0]) ?
sc->sc_ibufs[1] : sc->sc_ibufs[0];
sc->sc_ibufhigh = sc->sc_ibuf + COM_IHIGHWATER;
sc->sc_ibufend = sc->sc_ibuf + COM_IBUFSIZE;
 1025         if (tp == NULL || !ISSET(tp->t_state, TS_ISOPEN)) {
splx(s);
 1027                 goto out;
 1028         }
 1030         if (ISSET(tp->t_cflag, CRTSCTS) &&
 1031             !ISSET(sc->sc_mcr, MCR_RTS)) {
 1032                 /* XXX */
SET(sc->sc_mcr, MCR_RTS);
bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_mcr,
sc->sc_mcr);
 1036         }
splx(s);
 1040         while (ibufp < ibufend) {
c = *ibufp++;
 1042                 if (ISSET(*ibufp, LSR_OE)) {
sc->sc_overflows++;
 1044                         if (sc->sc_errors++ == 0)
timeout_add(&sc->sc_diag_tmo, 60 * hz);
 1046                 }
 1047                 /* This is ugly, but fast. */
c |= lsrmap[(*ibufp++ & (LSR_BI|LSR_FE|LSR_PE)) >> 2];
 1049                 (*linesw[tp->t_line].l_rint)(c, tp);
 1050         }
out:
 1053 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS
timeout_add(&sc->sc_comsoft_tmo, 1);
 1055 #else
 1056         ;
 1057 #endif
 1058 }
 1060 #ifdef KGDB
 1062 /*
 1063  * If a line break is set, or data matches one of the characters
 1064  * gdb uses to signal a connection, then start up kgdb. Just gobble
 1065  * any other data. Done in a stand alone function because comintr
 1066  * does tty stuff and we don't have one.
 1067  */
 1069 int
kgdbintr(void *arg)
 1071 {
 1072         struct com_softc *sc = arg;
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
u_char lsr, data, msr, delta;
 1077         if (!ISSET(sc->sc_hwflags, COM_HW_KGDB))
 1078                 return(0);
 1080         for (;;) {
lsr = bus_space_read_1(iot, ioh, com_lsr);
 1082                 if (ISSET(lsr, LSR_RXRDY)) {
 1083                         do {
data = bus_space_read_1(iot, ioh, com_data);
 1085                                 if (data == 3 || data == '$' || data == '+' ||
ISSET(lsr, LSR_BI)) {
kgdb_connect(1);
data = 0;
 1089                                 }
lsr = bus_space_read_1(iot, ioh, com_lsr);
 1091                         } while (ISSET(lsr, LSR_RXRDY));
 1093                 }
 1094                 if (ISSET(lsr, LSR_BI|LSR_FE|LSR_PE|LSR_OE))
printf("weird lsr %02x\n", lsr);
msr = bus_space_read_1(iot, ioh, com_msr);
 1099                 if (msr != sc->sc_msr) {
delta = msr ^ sc->sc_msr;
sc->sc_msr = msr;
 1102                         if (ISSET(delta, MSR_DCD)) {
 1103                                 if (!ISSET(sc->sc_swflags, COM_SW_SOFTCAR)) {
CLR(sc->sc_mcr, sc->sc_dtr);
bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr);
 1106                                 }
 1107                         }
 1108                 }
 1109                 if (ISSET(bus_space_read_1(iot, ioh, com_iir), IIR_NOPEND))
 1110                         return (1);
 1111         }
 1112 }
 1113 #endif /* KGDB */
 1115 int
comintr(void *arg)
 1117 {
 1118         struct com_softc *sc = arg;
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
 1121         struct tty *tp;
u_char lsr, data, msr, delta;
 1124         if (!sc->sc_tty)
 1125                 return (0);             /* can't do squat. */
 1127         if (ISSET(bus_space_read_1(iot, ioh, com_iir), IIR_NOPEND))
 1128                 return (0);
tp = sc->sc_tty;
 1132         for (;;) {
lsr = bus_space_read_1(iot, ioh, com_lsr);
 1135                 if (ISSET(lsr, LSR_RXRDY)) {
u_char *p = sc->sc_ibufp;
 1138 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS
softintr_schedule(sc->sc_si);
 1140 #endif
 1141                         do {
data = bus_space_read_1(iot, ioh, com_data);
 1143                                 if (ISSET(lsr, LSR_BI)) {
 1144 #if defined(COM_CONSOLE) && defined(DDB)
 1145                                         if (ISSET(sc->sc_hwflags,
COM_HW_CONSOLE)) {
 1147                                                 if (db_console)
Debugger();
 1149                                                 goto next;
 1150                                         }
 1151 #endif
data = 0;
 1153                                 }
 1154                                 if (p >= sc->sc_ibufend) {
sc->sc_floods++;
 1156                                         if (sc->sc_errors++ == 0)
timeout_add(&sc->sc_diag_tmo, 60 * hz);
 1158                                 } else {
 1159                                         *p++ = data;
 1160                                         *p++ = lsr;
 1161                                         if (p == sc->sc_ibufhigh &&
ISSET(tp->t_cflag, CRTSCTS)) {
 1163                                                 /* XXX */
CLR(sc->sc_mcr, MCR_RTS);
bus_space_write_1(iot, ioh, com_mcr,
sc->sc_mcr);
 1167                                         }
 1168                                 }
 1169 #if defined(COM_CONSOLE) && defined(DDB)
next:
 1171 #endif
lsr = bus_space_read_1(iot, ioh, com_lsr);
 1173                         } while (ISSET(lsr, LSR_RXRDY));
sc->sc_ibufp = p;
 1176                 }
msr = bus_space_read_1(iot, ioh, com_msr);
 1179                 if (msr != sc->sc_msr) {
delta = msr ^ sc->sc_msr;
ttytstamp(tp, sc->sc_msr & MSR_CTS, msr & MSR_CTS,
sc->sc_msr & MSR_DCD, msr & MSR_DCD);
sc->sc_msr = msr;
 1186                         if (ISSET(delta, MSR_DCD)) {
 1187                                 if (!ISSET(sc->sc_swflags, COM_SW_SOFTCAR) &&
 1188                                     (*linesw[tp->t_line].l_modem)(tp, ISSET(msr, MSR_DCD)) == 0) {
CLR(sc->sc_mcr, sc->sc_dtr);
bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr);
 1191                                 }
 1192                         }
 1193                         if (ISSET(delta & msr, MSR_CTS) &&
ISSET(tp->t_cflag, CRTSCTS)) {
 1195                                 /* the line is up and we want to do rts/cts flow control */
 1196                                 (*linesw[tp->t_line].l_start)(tp);
 1197                         }
 1198                 }
 1200                 if (ISSET(lsr, LSR_TXRDY) && ISSET(tp->t_state, TS_BUSY)) {
CLR(tp->t_state, TS_BUSY | TS_FLUSH);
 1202                         if (sc->sc_halt > 0)
wakeup(&tp->t_outq);
 1204                         (*linesw[tp->t_line].l_start)(tp);
 1205                 }
 1207 #ifdef COM_PXA2X0
 1208                 if (sc->sc_uarttype == COM_UART_PXA2X0 &&
ISSET(sc->sc_hwflags, COM_HW_SIR) &&
ISSET(lsr, LSR_TXRDY) && ISSET(lsr, LSR_TSRE))
bus_space_write_1(iot, ioh, com_isr, ISR_RECV);
 1212 #endif
 1214                 if (ISSET(bus_space_read_1(iot, ioh, com_iir), IIR_NOPEND))
 1215                         return (1);
 1216         }
 1217 }
 1219 /*
 1220  * Following are all routines needed for COM to act as console
 1221  */
 1223 #if defined(__sgi__)
 1224 #undef CONADDR
 1225 #undef COM_FREQ
 1226 #include <machine/autoconf.h>
 1227 #endif
 1229 /*
 1230  * The following functions are polled getc and putc routines, shared
 1231  * by the console and kgdb glue.
 1232  */
 1234 int
com_common_getc(bus_space_tag_t iot, bus_space_handle_t ioh)
 1236 {
 1237         int s = splhigh();
u_char stat, c;
 1240 #ifdef COM_PXA2X0
 1241         if (com_is_console(iot, comsiraddr))
bus_space_write_1(iot, ioh, com_isr, ISR_RECV);
 1243 #endif
 1245         /* block until a character becomes available */
 1246         while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_RXRDY))
 1247                 continue;
c = bus_space_read_1(iot, ioh, com_data);
 1250         /* clear any interrupts generated by this transmission */
stat = bus_space_read_1(iot, ioh, com_iir);
splx(s);
 1253         return (c);
 1254 }
 1256 void
com_common_putc(bus_space_tag_t iot, bus_space_handle_t ioh, int c)
 1258 {
 1259         int s = spltty();
 1260         int timo;
 1262         /* wait for any pending transmission to finish */
timo = 2000;
 1264         while (!ISSET(bus_space_read_1(iot, ioh, com_lsr), LSR_TXRDY) && --timo)
delay(1);
 1267 #ifdef COM_PXA2X0
 1268         if (com_is_console(iot, comsiraddr))
bus_space_write_1(iot, ioh, com_isr, ISR_SEND);
 1270 #endif
bus_space_write_1(iot, ioh, com_data, (u_int8_t)(c & 0xff));
bus_space_barrier(iot, ioh, 0, COM_NPORTS,
 1273             (BUS_SPACE_BARRIER_READ|BUS_SPACE_BARRIER_WRITE));
 1275         /* wait for this transmission to complete */
timo = 2000;
 1277         while (!ISSET(bus_space_read_1(iot, ioh, com_lsr), LSR_TXRDY) && --timo)
delay(1);
 1280 #ifdef COM_PXA2X0
 1281         if (com_is_console(iot, comsiraddr)) {
 1282                 /* wait for transmit shift register to become empty */
timo = 20000;
 1284                 while (!ISSET(bus_space_read_1(iot, ioh, com_lsr), LSR_TSRE)
 1285                     && --timo)
delay(1);
bus_space_write_1(iot, ioh, com_isr, ISR_RECV);
 1289         }
 1290 #endif
splx(s);
 1293 }
 1295 void
cominit(bus_space_tag_t iot, bus_space_handle_t ioh, int rate, int frequency)
 1297 {
 1298         int s = splhigh();
u_char stat;
bus_space_write_1(iot, ioh, com_lcr, LCR_DLAB);
rate = comspeed(frequency, rate); /* XXX not comdefaultrate? */
bus_space_write_1(iot, ioh, com_dlbl, rate);
bus_space_write_1(iot, ioh, com_dlbh, rate >> 8);
bus_space_write_1(iot, ioh, com_lcr, LCR_8BITS);
bus_space_write_1(iot, ioh, com_mcr, MCR_DTR | MCR_RTS);
 1307 #ifdef COM_PXA2X0
 1308         /* XXX */
bus_space_write_1(iot, ioh, com_ier, IER_EUART);  /* Make sure they are off */
 1310 #else
bus_space_write_1(iot, ioh, com_ier, 0);  /* Make sure they are off */
 1312 #endif
bus_space_write_1(iot, ioh, com_fifo,
FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_1);
stat = bus_space_read_1(iot, ioh, com_iir);
splx(s);
 1317 }
 1319 #ifdef COM_CONSOLE
 1320 void  
comcnprobe(struct consdev *cp)
 1322 {
 1323         /* XXX NEEDS TO BE FIXED XXX */
 1324 #ifdef MD_ISA_IOT
bus_space_tag_t iot = MD_ISA_IOT;
 1326 #elif defined(__sgi__)
bus_space_tag_t iot = sys_config.cons_iot;
 1328 #else
bus_space_tag_t iot = 0;
 1330 #endif
bus_space_handle_t ioh;
 1332         int found;
 1334         if (CONADDR == 0)
 1335                 return;
comconsiot = iot;
 1338         if (bus_space_map(iot, CONADDR, COM_NPORTS, 0, &ioh))
 1339                 return;
found = comprobe1(iot, ioh);
bus_space_unmap(iot, ioh, COM_NPORTS);
 1342         if (!found)
 1343                 return;
 1345         /* locate the major number */
 1346         for (commajor = 0; commajor < nchrdev; commajor++)
 1347                 if (cdevsw[commajor].d_open == comopen)
 1348                         break;
 1350         /* initialize required fields */
cp->cn_dev = makedev(commajor, CONUNIT);
 1352 #if defined(COMCONSOLE) || defined(PCCOMCONSOLE) || !defined(__amd64__)
cp->cn_pri = CN_REMOTE;
 1354 #else
cp->cn_pri = CN_NORMAL;
 1356 #endif
 1357 }
 1359 void
comcninit(struct consdev *cp)
 1361 {
comconsaddr = CONADDR;
 1364         if (bus_space_map(comconsiot, comconsaddr, COM_NPORTS, 0, &comconsioh))
panic("comcninit: mapping failed");
 1367         if (comconsfreq == 0)
comconsfreq = COM_FREQ;
cominit(comconsiot, comconsioh, comdefaultrate, comconsfreq);
comconsinit = 0;
 1372 }
 1375 int
comcnattach(bus_space_tag_t iot, bus_addr_t iobase, int rate, int frequency, tcflag_t cflag)
 1377 {
 1378         static struct consdev comcons = {
NULL, NULL, comcngetc, comcnputc, comcnpollc, NULL,
NODEV, CN_NORMAL
 1381         };
 1383 #ifndef __sparc64__
 1384         if (bus_space_map(iot, iobase, COM_NPORTS, 0, &comconsioh))
 1385                 return ENOMEM;
 1386 #endif
cominit(iot, comconsioh, rate, frequency);
cn_tab = &comcons;
comconsiot = iot;
comconsaddr = iobase;
comconscflag = cflag;
comconsfreq = frequency;
 1397         return (0);
 1398 }
 1400 int
comcngetc(dev_t dev)
 1402 {
 1403         return (com_common_getc(comconsiot, comconsioh));
 1404 }
 1406 /*
 1407  * Console kernel output character routine.
 1408  */
 1409 void
comcnputc(dev_t dev, int c)
 1411 {
com_common_putc(comconsiot, comconsioh, c);
 1413 }
 1415 void
comcnpollc(dev_t dev, int on)
 1417 {
 1419 }
 1420 #endif  /* COM_CONSOLE */
 1422 #ifdef KGDB
 1423 int
com_kgdb_attach(bus_space_tag_t iot, bus_addr_t iobase, int rate,
 1425     int frequency,tcflag_t cflag)
bus_space_tag_t iot;
bus_addr_t iobase;
 1428         int rate, frequency;
tcflag_t cflag;
 1430 {
 1431 #ifdef COM_CONSOLE
 1432         if (iot == comconsiot && iobase == comconsaddr) {
 1433                 return (EBUSY); /* cannot share with console */
 1434         }
 1435 #endif
com_kgdb_iot = iot;
com_kgdb_addr = iobase;
 1440         if (bus_space_map(com_kgdb_iot, com_kgdb_addr, COM_NPORTS, 0,
 1441             &com_kgdb_ioh))
panic("com_kgdb_attach: mapping failed");
 1444         /* XXX We currently don't respect KGDBMODE? */
cominit(com_kgdb_iot, com_kgdb_ioh, rate, frequency);
kgdb_attach(com_kgdb_getc, com_kgdb_putc, NULL);
kgdb_dev = 123; /* unneeded, only to satisfy some tests */
 1450         return (0);
 1451 }
 1453 /* ARGSUSED */
 1454 int
com_kgdb_getc(void *arg)
 1456 {
 1458         return (com_common_getc(com_kgdb_iot, com_kgdb_ioh));
 1459 }
 1461 /* ARGSUSED */
 1462 void
com_kgdb_putc(void *arg, int c)
 1464 {
 1466         return (com_common_putc(com_kgdb_iot, com_kgdb_ioh, c));
 1467 }
 1468 #endif /* KGDB */
 1470 #ifdef COM_PXA2X0
 1471 int
com_is_console(bus_space_tag_t iot, bus_addr_t iobase)
 1473 {
 1475         if (comconsiot == iot && comconsaddr == iobase)
 1476                 return (1);
 1477 #ifdef KGDB
 1478         else if (com_kgdb_iot == iot && com_kgdb_addr == iobase)
 1479                 return (1);
 1480 #endif
 1481         return (0);
 1482 }
 1483 #endif