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      1 /*	$NetBSD: mcclock_pad32.c,v 1.16 2009/03/14 21:04:19 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 (at) 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 1.16 2009/03/14 21:04:19 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 }
     84