text: /* $FreeBSD: src/sys/alpha/tlsb/mcclock_tlsb.c,v 1.7 2000/03/18 07:46:34 mjacob Exp $ */
  /* $NetBSD: mcclock_tlsb.c,v 1.8 1998/05/13 02:50:29 thorpej Exp $ */
  
  /*
   * Copyright (c) 1997, 2000 by Matthew Jacob
   * NASA AMES Research Center.
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice immediately at the beginning of the file, without modification,
   *    this list of conditions, and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
   * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   */
  
  #include <sys/param.h>
  #include <sys/kernel.h>
  #include <sys/systm.h>
  #include <sys/module.h>
  #include <sys/bus.h>
  
  #include <machine/clockvar.h>
  #include <dev/dec/mcclockvar.h>
  
  #include <alpha/tlsb/gbusvar.h>
  
  #include <alpha/tlsb/tlsbreg.h>		/* XXX */
  
  #include <dev/dec/mc146818reg.h>
  
  #define	KV(_addr)	((caddr_t)ALPHA_PHYS_TO_K0SEG((_addr)))
  /*
   * Registers are 64 bytes apart (and 1 byte wide)
   */
  #define	REGSHIFT	6
  
  struct mcclock_tlsb_softc {
  	unsigned long regbase;
  };
  
  static int	mcclock_tlsb_probe(device_t dev);
  static int	mcclock_tlsb_attach(device_t dev);
  static void	mcclock_tlsb_write(device_t, u_int, u_int);
  static u_int	mcclock_tlsb_read(device_t, u_int);
  
  static device_method_t mcclock_tlsb_methods[] = {
  	/* Device interface */
  	DEVMETHOD(device_probe,		mcclock_tlsb_probe),
  	DEVMETHOD(device_attach,	mcclock_tlsb_attach),
  
  	/* mcclock interface */
  	DEVMETHOD(mcclock_write,	mcclock_tlsb_write),
  	DEVMETHOD(mcclock_read,		mcclock_tlsb_read),
  
  	/* clock interface */
  	DEVMETHOD(clock_init,		mcclock_init),
  	DEVMETHOD(clock_get,		mcclock_get),
  	DEVMETHOD(clock_set,		mcclock_set),
  	DEVMETHOD(clock_getsecs,	mcclock_getsecs),
  
  	{ 0, 0 }
  };
  
  static driver_t mcclock_tlsb_driver = {
  	"mcclock", mcclock_tlsb_methods, sizeof(struct mcclock_tlsb_softc),
  };
  
  static devclass_t mcclock_devclass;
  
  int
  mcclock_tlsb_probe(device_t dev)
  {
  	device_set_desc(dev, "MC146818A real time clock");
  	return 0;
  }
  
  int
  mcclock_tlsb_attach(device_t dev)
  {
  	struct mcclock_tlsb_softc *sc = device_get_softc(dev);
  
  	/* XXX Should be bus.h'd, so we can accomodate the kn7aa. */
  
  	sc->regbase = TLSB_GBUS_BASE + gbus_get_offset(dev);
  
  	mcclock_attach(dev);
  	return 0;
  }
  
  static void
  mcclock_tlsb_write(device_t dev, u_int reg, u_int val)
  {
  	struct mcclock_tlsb_softc *sc = device_get_softc(dev);
  	unsigned char *ptr = (unsigned char *)
  		KV(sc->regbase + (reg << REGSHIFT));
  	*ptr = val;
  }
  
  static u_int
  mcclock_tlsb_read(device_t dev, u_int reg)
  {
  	struct mcclock_tlsb_softc *sc = device_get_softc(dev);
  	unsigned char *ptr = (unsigned char *)
  		KV(sc->regbase + (reg << REGSHIFT));
  	return *ptr;
  }
  
  DRIVER_MODULE(mcclock, gbus, mcclock_tlsb_driver, mcclock_devclass, 0, 0);
  