sys/arch/alpha/tlsb/mcclock_tlsb.c

   1 /* $NetBSD: mcclock_tlsb.c,v 1.15 2008/03/28 19:05:49 tsutsui Exp $ */
   2
   3 /*
   4  * Copyright (c) 1997 by Matthew Jacob
   5  * NASA AMES Research Center.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice immediately at the beginning of the file, without modification,
  13  *    this list of conditions, and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. The name of the author may not be used to endorse or promote products
  18  *    derived from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
  24  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>                  /* RCS ID & Copyright macro defns */
  34
  35 __KERNEL_RCSID(0, "$NetBSD: mcclock_tlsb.c,v 1.15 2008/03/28 19:05:49 tsutsui Exp $");
  36
  37 #include <sys/param.h>
  38 #include <sys/kernel.h>
  39 #include <sys/systm.h>
  40 #include <sys/device.h>
  41
  42 #include <machine/bus.h>
  43
  44 #include <alpha/tlsb/gbusvar.h>
  45
  46 #include <alpha/tlsb/tlsbreg.h>         /* XXX */
  47
  48 #include <dev/clock_subr.h>
  49
  50 #include <dev/ic/mc146818reg.h>
  51 #include <dev/ic/mc146818var.h>
  52
  53 #include <alpha/alpha/mcclockvar.h>
  54
  55 #include "ioconf.h"
  56
  57 #define KV(_addr)       ((void *)ALPHA_PHYS_TO_K0SEG((_addr)))
  58 /*
  59  * Registers are 64 bytes apart (and 1 byte wide)
  60  */
  61 #define REGSHIFT        6
  62
  63 struct mcclock_tlsb_softc {
  64         struct mc146818_softc   sc_mc146818;
  65         unsigned long regbase;
  66 };
  67
  68 int     mcclock_tlsb_match(device_t, cfdata_t, void *);
  69 void    mcclock_tlsb_attach(device_t, device_t, void *);
  70
  71 CFATTACH_DECL_NEW(mcclock_tlsb, sizeof(struct mcclock_tlsb_softc),
  72     mcclock_tlsb_match, mcclock_tlsb_attach, NULL, NULL);
  73
  74 static void     mcclock_tlsb_write(struct mc146818_softc *, u_int, u_int);
  75 static u_int    mcclock_tlsb_read(struct mc146818_softc *, u_int);
  76
  77
  78 int
  79 mcclock_tlsb_match(device_t parent, cfdata_t cf, void *aux)
  80 {
  81         struct gbus_attach_args *ga = aux;
  82
  83         if (strcmp(ga->ga_name, mcclock_cd.cd_name))
  84                 return (0);
  85         return (1);
  86 }
  87
  88 void
  89 mcclock_tlsb_attach(device_t parent, device_t self, void *aux)
  90 {
  91         struct mcclock_tlsb_softc *tsc = device_private(self);
  92         struct gbus_attach_args *ga = aux;
  93         struct mc146818_softc *sc = &tsc->sc_mc146818;
  94
  95         /* XXX Should be bus.h'd, so we can accommodate the kn7aa. */
  96         tsc->regbase = TLSB_GBUS_BASE + ga->ga_offset;
  97
  98         sc->sc_dev = self;
  99         sc->sc_mcread  = mcclock_tlsb_read;
 100         sc->sc_mcwrite = mcclock_tlsb_write;
 101
 102         mcclock_attach(sc);
 103 }
 104
 105 static void
 106 mcclock_tlsb_write(struct mc146818_softc *sc, u_int reg, u_int val)
 107 {
 108         struct mcclock_tlsb_softc *tsc = (void *)sc;
 109         unsigned char *ptr = (unsigned char *)
 110                 KV(tsc->regbase + (reg << REGSHIFT));
 111
 112         *ptr = val;
 113 }
 114
 115 static u_int
 116 mcclock_tlsb_read(struct mc146818_softc *sc, u_int reg)
 117 {
 118         struct mcclock_tlsb_softc *tsc = (void *)sc;
 119         unsigned char *ptr = (unsigned char *)
 120                 KV(tsc->regbase + (reg << REGSHIFT));
 121
 122         return *ptr;
 123 }