/*      $NetBSD: mcclock.c,v 1.5 2011/07/01 20:36:42 dyoung Exp $       */

/*
* Copyright (c) 1995, 1996 Carnegie-Mellon University.
* All rights reserved.
*
* Author: Chris G. Demetriou
*
* Permission to use, copy, modify and distribute this software and
* its documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
*  Software Distribution Coordinator  or  [email protected]
*  School of Computer Science
*  Carnegie Mellon University
*  Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: mcclock.c,v 1.5 2011/07/01 20:36:42 dyoung Exp $");

#include <sys/cdefs.h>                  /* RCS ID & Copyright macro defns */

#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/device.h>

#include <machine/autoconf.h>
#include <sys/bus.h>

#include <dev/clock_subr.h>
#include <dev/ic/mc146818reg.h>
#include <dev/ic/mc146818var.h>

#define MCCLOCK_NPORTS  2

static int mcclock_match(device_t, cfdata_t, void *);
static void mcclock_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(mcclock, sizeof (struct mc146818_softc),
   mcclock_match, mcclock_attach, NULL, NULL);

static void mcclock_write(struct mc146818_softc *, u_int, u_int);
static u_int mcclock_read(struct mc146818_softc *, u_int);


static int
mcclock_match(device_t parent, cfdata_t cf, void *aux)
{
       static int mcclock_found;

       if (mcclock_found)
               return 0;

       mcclock_found = 1;

       return 1;
}

static void
mcclock_attach(device_t parent, device_t self, void *aux)
{
       struct mc146818_softc *sc = device_private(self);
       struct mainbus_attach_args *ma = aux;

       sc->sc_dev = self;
       sc->sc_bst = ma->ma_iot;
       if (bus_space_map(sc->sc_bst, ma->ma_addr, MCCLOCK_NPORTS,
           0, &sc->sc_bsh)) {
               aprint_error("mcclock_attach: unable to map registers\n");
               return;
       }

       sc->sc_year0 = 2000;
       sc->sc_mcread = mcclock_read;
       sc->sc_mcwrite = mcclock_write;
       sc->sc_flag = MC146818_BCD;
       mc146818_attach(sc);

       aprint_normal("\n");

       (*sc->sc_mcwrite)(sc, MC_REGB, MC_REGB_24HR);
}

static void
mcclock_write(struct mc146818_softc *sc, u_int reg, u_int datum)
{
       bus_space_tag_t iot;
       bus_space_handle_t ioh;

       iot = sc->sc_bst;
       ioh = sc->sc_bsh;

       bus_space_write_1(iot, ioh, 0, reg);
       bus_space_write_1(iot, ioh, 1, datum);
}

static u_int
mcclock_read(struct mc146818_softc *sc, u_int reg)
{
       bus_space_tag_t iot;
       bus_space_handle_t ioh;
       u_int datum;

       iot = sc->sc_bst;
       ioh = sc->sc_bsh;

       bus_space_write_1(iot, ioh, 0, reg);
       datum = bus_space_read_1(iot, ioh, 1);

       return datum;
}