FreeBSD/Linux Kernel Cross Reference
sys/powerpc/mambo/mambo_console.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (C) 2008 by Nathan Whitehorn. All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/kdb.h>
    #include <sys/kernel.h>
    #include <sys/priv.h>
    #include <sys/systm.h>
    #include <sys/types.h>
    #include <sys/conf.h>
    #include <sys/cons.h>
    #include <sys/consio.h>
    #include <sys/tty.h>
    
    #include <dev/ofw/openfirm.h>
    
    #include <ddb/ddb.h>
    
    #include "mambocall.h"
    
    #define MAMBOBURSTLEN   128     /* max number of bytes to write in one chunk */
    
    #define MAMBO_CONSOLE_WRITE     0
    #define MAMBO_CONSOLE_READ      60
    
    static tsw_outwakeup_t mambotty_outwakeup;
    
    static struct ttydevsw mambo_ttydevsw = {
            .tsw_flags      = TF_NOPREFIX,
            .tsw_outwakeup  = mambotty_outwakeup,
    };
    
    static int                      polltime;
    static struct callout           mambo_callout;
    static struct tty               *tp = NULL;
    
    #if defined(KDB)
    static int                      alt_break_state;
    #endif
    
    static void     mambo_timeout(void *);
    
    static cn_probe_t       mambo_cnprobe;
    static cn_init_t        mambo_cninit;
    static cn_term_t        mambo_cnterm;
    static cn_getc_t        mambo_cngetc;
    static cn_putc_t        mambo_cnputc;
    static cn_grab_t        mambo_cngrab;
    static cn_ungrab_t      mambo_cnungrab;
    
    CONSOLE_DRIVER(mambo);
    
    static void
    cn_drvinit(void *unused)
    {
    
            if (mambo_consdev.cn_pri != CN_DEAD &&
                mambo_consdev.cn_name[0] != '\0') {
                    if (OF_finddevice("/mambo") == -1)
                            return;
    
                    tp = tty_alloc(&mambo_ttydevsw, NULL);
                    tty_init_console(tp, 0);
                    tty_makedev(tp, NULL, "%s", "mambocons");
    
                    polltime = 1;
    
                    callout_init(&mambo_callout, 1);
                    callout_reset(&mambo_callout, polltime, mambo_timeout, NULL);
            }
    }
    
    SYSINIT(cndev, SI_SUB_CONFIGURE, SI_ORDER_MIDDLE, cn_drvinit, NULL);
   
   static void
   mambotty_outwakeup(struct tty *tp)
   {
           int len;
           u_char buf[MAMBOBURSTLEN];
   
           for (;;) {
                   len = ttydisc_getc(tp, buf, sizeof buf);
                   if (len == 0)
                           break;
                   mambocall(MAMBO_CONSOLE_WRITE, buf, (register_t)len, 1UL);
           }
   }
   
   static void
   mambo_timeout(void *v)
   {
           int     c;
   
           tty_lock(tp);
           while ((c = mambo_cngetc(NULL)) != -1)
                   ttydisc_rint(tp, c, 0);
           ttydisc_rint_done(tp);
           tty_unlock(tp);
   
           callout_reset(&mambo_callout, polltime, mambo_timeout, NULL);
   }
   
   static void
   mambo_cnprobe(struct consdev *cp)
   {
           if (OF_finddevice("/mambo") == -1) {
                   cp->cn_pri = CN_DEAD;
                   return;
           }
   
           cp->cn_pri = CN_NORMAL;
   }
   
   static void
   mambo_cninit(struct consdev *cp)
   {
   
           /* XXX: This is the alias, but that should be good enough */
           strcpy(cp->cn_name, "mambocons");
   }
   
   static void
   mambo_cnterm(struct consdev *cp)
   {
   }
   
   static void
   mambo_cngrab(struct consdev *cp)
   {
   }
   
   static void
   mambo_cnungrab(struct consdev *cp)
   {
   }
   
   static int
   mambo_cngetc(struct consdev *cp)
   {
           int ch;
   
           ch = mambocall(MAMBO_CONSOLE_READ);
   
           if (ch > 0 && ch < 0xff) {
   #if defined(KDB)
                   kdb_alt_break(ch, &alt_break_state);
   #endif
                   return (ch);
           }
   
           return (-1);
   }
   
   static void
   mambo_cnputc(struct consdev *cp, int c)
   {
           char cbuf;
   
           cbuf = c;
           mambocall(MAMBO_CONSOLE_WRITE, &cbuf, 1UL, 1UL);
   }

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