sys/dev/dec/mcclock_pad32.c

   1 /*      $NetBSD: mcclock_pad32.c,v 1.15 2009/03/14 15:36:17 dsl Exp $   */
   2
   3 /*
   4  * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
   5  * All rights reserved.
   6  *
   7  * Author: Chris G. Demetriou
   8  *
   9  * Permission to use, copy, modify and distribute this software and
  10  * its documentation is hereby granted, provided that both the copyright
  11  * notice and this permission notice appear in all copies of the
  12  * software, derivative works or modified versions, and any portions
  13  * thereof, and that both notices appear in supporting documentation.
  14  *
  15  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  16  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
  17  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  18  *
  19  * Carnegie Mellon requests users of this software to return to
  20  *
  21  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  22  *  School of Computer Science
  23  *  Carnegie Mellon University
  24  *  Pittsburgh PA 15213-3890
  25  *
  26  * any improvements or extensions that they make and grant Carnegie the
  27  * rights to redistribute these changes.
  28  */
  29
  30 #include <sys/cdefs.h>
  31 __KERNEL_RCSID(0, "$NetBSD: mcclock_pad32.c,v 1.15 2009/03/14 15:36:17 dsl Exp $");
  32
  33
  34 /*
  35  * mc1461818 (or compatible) clock chip driver,  for machines where each
  36  * byte-wide mcclock chip register is  mapped
  37  * into the low-order byte of a little-endian 32-bit word.
  38  *
  39  *  DECstation 2100/3100
  40  *  DECstation 5100
  41  *  DECstation 5000/200 baseboard
  42  *  IOCTL asic machines (Alpha  3000 series, Decstation 5000 series)
  43  *
  44  * bus-specific frontends should just declare an attach and match
  45  * entry, and set up a initializea switch to call the functions below.
  46  */
  47
  48 #include <sys/param.h>
  49 #include <sys/kernel.h>
  50 #include <sys/systm.h>
  51 #include <sys/device.h>
  52 #include <dev/clock_subr.h>
  53
  54 #include <machine/autoconf.h>
  55 #include <dev/dec/clockvar.h>
  56 #include <dev/dec/mcclockvar.h>
  57 #include <dev/ic/mc146818reg.h>
  58
  59 #include <dev/dec/mcclock_pad32.h>
  60
  61
  62 void    mcclock_pad32_write(struct mcclock_softc *, u_int, u_int);
  63 u_int   mcclock_pad32_read(struct mcclock_softc *, u_int);
  64
  65 const struct mcclock_busfns mcclock_pad32_busfns = {
  66         mcclock_pad32_write, mcclock_pad32_read,
  67 };
  68
  69 void
  70 mcclock_pad32_write(struct mcclock_softc *dev, u_int reg, u_int datum)
  71 {
  72         struct mcclock_pad32_softc *sc = (struct mcclock_pad32_softc *)dev;
  73
  74         sc->sc_dp[reg].datum = datum;
  75 }
  76
  77 u_int
  78 mcclock_pad32_read(struct mcclock_softc *dev, u_int reg)
  79 {
  80         struct mcclock_pad32_softc *sc = (struct mcclock_pad32_softc *)dev;
  81
  82         return (sc->sc_dp[reg].datum);
  83 }