sys/arch/cobalt/dev/mcclock.c

   1 /*      $NetBSD: mcclock.c,v 1.3 2008/03/28 19:05:49 tsutsui Exp $      */
   2
   3 /*
   4  * Copyright (c) 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.c,v 1.3 2008/03/28 19:05:49 tsutsui Exp $");
  32
  33 #include <sys/cdefs.h>                  /* RCS ID & Copyright macro defns */
  34
  35 #include <sys/param.h>
  36 #include <sys/kernel.h>
  37 #include <sys/systm.h>
  38 #include <sys/device.h>
  39
  40 #include <machine/autoconf.h>
  41 #include <machine/bus.h>
  42
  43 #include <dev/clock_subr.h>
  44 #include <dev/ic/mc146818reg.h>
  45 #include <dev/ic/mc146818var.h>
  46
  47 #define MCCLOCK_NPORTS  2
  48
  49 static int mcclock_match(device_t, cfdata_t, void *);
  50 static void mcclock_attach(device_t, device_t, void *);
  51
  52 CFATTACH_DECL_NEW(mcclock, sizeof (struct mc146818_softc),
  53     mcclock_match, mcclock_attach, NULL, NULL);
  54
  55 static void mcclock_write(struct mc146818_softc *, u_int, u_int);
  56 static u_int mcclock_read(struct mc146818_softc *, u_int);
  57
  58
  59 static int
  60 mcclock_match(device_t parent, cfdata_t cf, void *aux)
  61 {
  62         static int mcclock_found;
  63
  64         if (mcclock_found)
  65                 return 0;
  66
  67         mcclock_found = 1;
  68
  69         return 1;
  70 }
  71
  72 static void
  73 mcclock_attach(device_t parent, device_t self, void *aux)
  74 {
  75         struct mc146818_softc *sc = device_private(self);
  76         struct mainbus_attach_args *ma = aux;
  77
  78         sc->sc_dev = self;
  79         sc->sc_bst = ma->ma_iot;
  80         if (bus_space_map(sc->sc_bst, ma->ma_addr, MCCLOCK_NPORTS,
  81             0, &sc->sc_bsh)) {
  82                 aprint_error("mcclock_attach: unable to map registers\n");
  83                 return;
  84         }
  85
  86         sc->sc_year0 = 2000;
  87         sc->sc_mcread = mcclock_read;
  88         sc->sc_mcwrite = mcclock_write;
  89         sc->sc_flag = MC146818_BCD;
  90         mc146818_attach(sc);
  91
  92         aprint_normal("\n");
  93
  94         (*sc->sc_mcwrite)(sc, MC_REGB, MC_REGB_24HR);
  95 }
  96
  97 static void
  98 mcclock_write(struct mc146818_softc *sc, u_int reg, u_int datum)
  99 {
 100         bus_space_tag_t iot;
 101         bus_space_handle_t ioh;
 102
 103         iot = sc->sc_bst;
 104         ioh = sc->sc_bsh;
 105
 106         bus_space_write_1(iot, ioh, 0, reg);
 107         bus_space_write_1(iot, ioh, 1, datum);
 108 }
 109
 110 static u_int
 111 mcclock_read(struct mc146818_softc *sc, u_int reg)
 112 {
 113         bus_space_tag_t iot;
 114         bus_space_handle_t ioh;
 115         u_int datum;
 116
 117         iot = sc->sc_bst;
 118         ioh = sc->sc_bsh;
 119
 120         bus_space_write_1(iot, ioh, 0, reg);
 121         datum = bus_space_read_1(iot, ioh, 1);
 122
 123         return datum;
 124 }