root/kern/dev/lamebus/rtclock_ltimer.c

DEFINITIONS

1. attach_rtclock_to_ltimer

   1 /*
   2  * Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009
   3  *      The President and Fellows of Harvard College.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. 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 UNIVERSITY 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 UNIVERSITY 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  */
  30 /*
  31  * Code for attaching the (generic) rtclock device to the LAMEbus ltimer.
  32  *
  33  * rtclock is a generic clock interface that gets its clock service from
  34  * an actual hardware clock of some kind. (Theoretically it could also
  35  * get its clock service from a clock maintained in software, as is the
  36  * case on most systems. However, no such driver has been written yet.)
  37  *
  38  * ltimer can provide this clock service.
  39  */
  41 #include <types.h>
  42 #include <lib.h>
  43 #include <generic/rtclock.h>
  44 #include <lamebus/ltimer.h>
  45 #include "autoconf.h"
  47 struct rtclock_softc *
  48 attach_rtclock_to_ltimer(int rtclockno, struct ltimer_softc *ls)
  49 {
  50         /*
  51          * No need to probe; ltimer always has a clock.
  52          * Just allocate the rtclock, set our fields, and return it.
  53          */
  54         struct rtclock_softc *rtc = kmalloc(sizeof(struct rtclock_softc));
  55         if (rtc==NULL) {
  56                 /* Out of memory */
  57                 return NULL;
  58         }
  60         (void)rtclockno;  // unused
rtc->rtc_devdata = ls;
rtc->rtc_gettime = ltimer_gettime;
  65         return rtc;
  66 }