uart_tty.c

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    1 /*-
    2  * Copyright (c) 2003 Marcel Moolenaar
    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  *
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD$");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/bus.h>
   33 #include <sys/conf.h>
   34 #include <sys/cons.h>
   35 #include <sys/fcntl.h>
   36 #include <sys/interrupt.h>
   37 #include <sys/kernel.h>
   38 #include <sys/malloc.h>
   39 #include <sys/reboot.h>
   40 #include <machine/bus.h>
   41 #include <sys/rman.h>
   42 #include <sys/tty.h>
   43 #include <machine/resource.h>
   44 #include <machine/stdarg.h>
   45 
   46 #include <dev/uart/uart.h>
   47 #include <dev/uart/uart_bus.h>
   48 #include <dev/uart/uart_cpu.h>
   49 
   50 #include "uart_if.h"
   51 
   52 static cn_probe_t uart_cnprobe;
   53 static cn_init_t uart_cninit;
   54 static cn_term_t uart_cnterm;
   55 static cn_getc_t uart_cngetc;
   56 static cn_putc_t uart_cnputc;
   57 static cn_grab_t uart_cngrab;
   58 static cn_ungrab_t uart_cnungrab;
   59 
   60 CONSOLE_DRIVER(uart);
   61 
   62 static struct uart_devinfo uart_console;
   63 
   64 static void
   65 uart_cnprobe(struct consdev *cp)
   66 {
   67 
   68         cp->cn_pri = CN_DEAD;
   69 
   70         KASSERT(uart_console.cookie == NULL, ("foo"));
   71 
   72         if (uart_cpu_getdev(UART_DEV_CONSOLE, &uart_console))
   73                 return;
   74 
   75         if (uart_probe(&uart_console))
   76                 return;
   77 
   78         strlcpy(cp->cn_name, uart_driver_name, sizeof(cp->cn_name));
   79         cp->cn_pri = (boothowto & RB_SERIAL) ? CN_REMOTE : CN_NORMAL;
   80         cp->cn_arg = &uart_console;
   81 }
   82 
   83 static void
   84 uart_cninit(struct consdev *cp)
   85 {
   86         struct uart_devinfo *di;
   87 
   88         /*
   89          * Yedi trick: we need to be able to define cn_dev before we go
   90          * single- or multi-user. The problem is that we don't know at
   91          * this time what the device will be. Hence, we need to link from
   92          * the uart_devinfo to the consdev that corresponds to it so that
   93          * we can define cn_dev in uart_bus_attach() when we find the
   94          * device during bus enumeration. That's when we'll know what the
   95          * the unit number will be.
   96          */
   97         di = cp->cn_arg;
   98         KASSERT(di->cookie == NULL, ("foo"));
   99         di->cookie = cp;
  100         di->type = UART_DEV_CONSOLE;
  101         uart_add_sysdev(di);
  102         uart_init(di);
  103 }
  104 
  105 static void
  106 uart_cnterm(struct consdev *cp)
  107 {
  108 
  109         uart_term(cp->cn_arg);
  110 }
  111 
  112 static void
  113 uart_cngrab(struct consdev *cp)
  114 {
  115 }
  116 
  117 static void
  118 uart_cnungrab(struct consdev *cp)
  119 {
  120 }
  121 
  122 static void
  123 uart_cnputc(struct consdev *cp, int c)
  124 {
  125 
  126         uart_putc(cp->cn_arg, c);
  127 }
  128 
  129 static int
  130 uart_cngetc(struct consdev *cp)
  131 {
  132 
  133         return (uart_poll(cp->cn_arg));
  134 }
  135 
  136 static int
  137 uart_tty_open(struct tty *tp)
  138 {
  139         struct uart_softc *sc;
  140 
  141         sc = tty_softc(tp);
  142 
  143         if (sc == NULL || sc->sc_leaving)
  144                 return (ENXIO);
  145 
  146         sc->sc_opened = 1;
  147         return (0);
  148 }
  149 
  150 static void
  151 uart_tty_close(struct tty *tp)
  152 {
  153         struct uart_softc *sc;
  154 
  155         sc = tty_softc(tp);
  156         if (sc == NULL || sc->sc_leaving || !sc->sc_opened) 
  157                 return;
  158 
  159         if (sc->sc_hwiflow)
  160                 UART_IOCTL(sc, UART_IOCTL_IFLOW, 0);
  161         if (sc->sc_hwoflow)
  162                 UART_IOCTL(sc, UART_IOCTL_OFLOW, 0);
  163         if (sc->sc_sysdev == NULL)
  164                 UART_SETSIG(sc, SER_DDTR | SER_DRTS);
  165 
  166         wakeup(sc);
  167         sc->sc_opened = 0;
  168         return;
  169 }
  170 
  171 static void
  172 uart_tty_outwakeup(struct tty *tp)
  173 {
  174         struct uart_softc *sc;
  175 
  176         sc = tty_softc(tp);
  177         if (sc == NULL || sc->sc_leaving)
  178                 return;
  179 
  180         if (sc->sc_txbusy)
  181                 return;
  182 
  183         /*
  184          * Respect RTS/CTS (output) flow control if enabled and not already
  185          * handled by hardware.
  186          */
  187         if ((tp->t_termios.c_cflag & CCTS_OFLOW) && !sc->sc_hwoflow &&
  188             !(sc->sc_hwsig & SER_CTS))
  189                 return;
  190 
  191         sc->sc_txdatasz = ttydisc_getc(tp, sc->sc_txbuf, sc->sc_txfifosz);
  192         if (sc->sc_txdatasz != 0)
  193                 UART_TRANSMIT(sc);
  194 }
  195 
  196 static void
  197 uart_tty_inwakeup(struct tty *tp)
  198 {
  199         struct uart_softc *sc;
  200 
  201         sc = tty_softc(tp);
  202         if (sc == NULL || sc->sc_leaving)
  203                 return;
  204 
  205         if (sc->sc_isquelch) {
  206                 if ((tp->t_termios.c_cflag & CRTS_IFLOW) && !sc->sc_hwiflow)
  207                         UART_SETSIG(sc, SER_DRTS|SER_RTS);
  208                 sc->sc_isquelch = 0;
  209                 uart_sched_softih(sc, SER_INT_RXREADY);
  210         }
  211 }
  212 
  213 static int
  214 uart_tty_ioctl(struct tty *tp, u_long cmd, caddr_t data, struct thread *td)
  215 {
  216         struct uart_softc *sc;
  217 
  218         sc = tty_softc(tp);
  219 
  220         switch (cmd) {
  221         case TIOCSBRK:
  222                 UART_IOCTL(sc, UART_IOCTL_BREAK, 1);
  223                 return (0);
  224         case TIOCCBRK:
  225                 UART_IOCTL(sc, UART_IOCTL_BREAK, 0);
  226                 return (0);
  227         default:
  228                 return pps_ioctl(cmd, data, &sc->sc_pps);
  229         }
  230 }
  231 
  232 static int
  233 uart_tty_param(struct tty *tp, struct termios *t)
  234 {
  235         struct uart_softc *sc;
  236         int databits, parity, stopbits;
  237 
  238         sc = tty_softc(tp);
  239         if (sc == NULL || sc->sc_leaving)
  240                 return (ENODEV);
  241         if (t->c_ispeed != t->c_ospeed && t->c_ospeed != 0)
  242                 return (EINVAL);
  243         /* Fixate certain parameters for system devices. */
  244         if (sc->sc_sysdev != NULL) {
  245                 t->c_ispeed = t->c_ospeed = sc->sc_sysdev->baudrate;
  246                 t->c_cflag |= CLOCAL;
  247                 t->c_cflag &= ~HUPCL;
  248         }
  249         if (t->c_ospeed == 0) {
  250                 UART_SETSIG(sc, SER_DDTR | SER_DRTS);
  251                 return (0);
  252         }
  253         switch (t->c_cflag & CSIZE) {
  254         case CS5:       databits = 5; break;
  255         case CS6:       databits = 6; break;
  256         case CS7:       databits = 7; break;
  257         default:        databits = 8; break;
  258         }
  259         stopbits = (t->c_cflag & CSTOPB) ? 2 : 1;
  260         if (t->c_cflag & PARENB)
  261                 parity = (t->c_cflag & PARODD) ? UART_PARITY_ODD
  262                     : UART_PARITY_EVEN;
  263         else
  264                 parity = UART_PARITY_NONE;
  265         if (UART_PARAM(sc, t->c_ospeed, databits, stopbits, parity) != 0)
  266                 return (EINVAL);
  267         UART_SETSIG(sc, SER_DDTR | SER_DTR);
  268         /* Set input flow control state. */
  269         if (!sc->sc_hwiflow) {
  270                 if ((t->c_cflag & CRTS_IFLOW) && sc->sc_isquelch)
  271                         UART_SETSIG(sc, SER_DRTS);
  272                 else
  273                         UART_SETSIG(sc, SER_DRTS | SER_RTS);
  274         } else
  275                 UART_IOCTL(sc, UART_IOCTL_IFLOW, (t->c_cflag & CRTS_IFLOW));
  276         /* Set output flow control state. */
  277         if (sc->sc_hwoflow)
  278                 UART_IOCTL(sc, UART_IOCTL_OFLOW, (t->c_cflag & CCTS_OFLOW));
  279 
  280         return (0);
  281 }
  282 
  283 static int
  284 uart_tty_modem(struct tty *tp, int biton, int bitoff)
  285 {
  286         struct uart_softc *sc;
  287 
  288         sc = tty_softc(tp);
  289         if (biton != 0 || bitoff != 0)
  290                 UART_SETSIG(sc, SER_DELTA(bitoff|biton) | biton);
  291         return (sc->sc_hwsig);
  292 }
  293 
  294 void
  295 uart_tty_intr(void *arg)
  296 {
  297         struct uart_softc *sc = arg;
  298         struct tty *tp;
  299         int c, err = 0, pend, sig, xc;
  300 
  301         if (sc->sc_leaving)
  302                 return;
  303 
  304         pend = atomic_readandclear_32(&sc->sc_ttypend);
  305         if (!(pend & SER_INT_MASK))
  306                 return;
  307 
  308         tp = sc->sc_u.u_tty.tp;
  309         tty_lock(tp);
  310 
  311         if (pend & SER_INT_RXREADY) {
  312                 while (!uart_rx_empty(sc) && !sc->sc_isquelch) {
  313                         xc = uart_rx_peek(sc);
  314                         c = xc & 0xff;
  315                         if (xc & UART_STAT_FRAMERR)
  316                                 err |= TRE_FRAMING;
  317                         if (xc & UART_STAT_OVERRUN)
  318                                 err |= TRE_OVERRUN;
  319                         if (xc & UART_STAT_PARERR)
  320                                 err |= TRE_PARITY;
  321                         if (ttydisc_rint(tp, c, err) != 0) {
  322                                 sc->sc_isquelch = 1;
  323                                 if ((tp->t_termios.c_cflag & CRTS_IFLOW) &&
  324                                     !sc->sc_hwiflow)
  325                                         UART_SETSIG(sc, SER_DRTS);
  326                         } else
  327                                 uart_rx_next(sc);
  328                 }
  329         }
  330 
  331         if (pend & SER_INT_BREAK)
  332                 ttydisc_rint(tp, 0, TRE_BREAK);
  333 
  334         if (pend & SER_INT_SIGCHG) {
  335                 sig = pend & SER_INT_SIGMASK;
  336                 if (sig & SER_DDCD)
  337                         ttydisc_modem(tp, sig & SER_DCD);
  338                 if (sig & SER_DCTS)
  339                         uart_tty_outwakeup(tp);
  340         }
  341 
  342         if (pend & SER_INT_TXIDLE)
  343                 uart_tty_outwakeup(tp);
  344         ttydisc_rint_done(tp);
  345         tty_unlock(tp);
  346 }
  347 
  348 static void
  349 uart_tty_free(void *arg)
  350 {
  351 
  352         /*
  353          * XXX: uart(4) could reuse the device unit number before it is
  354          * being freed by the TTY layer. We should use this hook to free
  355          * the device unit number, but unfortunately newbus does not
  356          * seem to support such a construct.
  357          */
  358 }
  359 
  360 static struct ttydevsw uart_tty_class = {
  361         .tsw_flags      = TF_INITLOCK|TF_CALLOUT,
  362         .tsw_open       = uart_tty_open,
  363         .tsw_close      = uart_tty_close,
  364         .tsw_outwakeup  = uart_tty_outwakeup,
  365         .tsw_inwakeup   = uart_tty_inwakeup,
  366         .tsw_ioctl      = uart_tty_ioctl,
  367         .tsw_param      = uart_tty_param,
  368         .tsw_modem      = uart_tty_modem,
  369         .tsw_free       = uart_tty_free,
  370 };
  371 
  372 int
  373 uart_tty_attach(struct uart_softc *sc)
  374 {
  375         struct tty *tp;
  376         int unit;
  377 
  378         sc->sc_u.u_tty.tp = tp = tty_alloc(&uart_tty_class, sc);
  379 
  380         unit = device_get_unit(sc->sc_dev);
  381 
  382         if (sc->sc_sysdev != NULL && sc->sc_sysdev->type == UART_DEV_CONSOLE) {
  383                 sprintf(((struct consdev *)sc->sc_sysdev->cookie)->cn_name,
  384                     "ttyu%r", unit);
  385                 tty_init_console(tp, 0);
  386         }
  387 
  388         swi_add(&tty_intr_event, uart_driver_name, uart_tty_intr, sc, SWI_TTY,
  389             INTR_TYPE_TTY, &sc->sc_softih);
  390 
  391         tty_makedev(tp, NULL, "u%r", unit);
  392 
  393         return (0);
  394 }
  395 
  396 int
  397 uart_tty_detach(struct uart_softc *sc)
  398 {
  399         struct tty *tp;
  400 
  401         tp = sc->sc_u.u_tty.tp;
  402 
  403         tty_lock(tp);
  404         swi_remove(sc->sc_softih);
  405         tty_rel_gone(tp);
  406 
  407         return (0);
  408 }
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FreeBSD/Linux Kernel Cross Reference sys/dev/uart/uart_tty.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/uart/uart_tty.c
