/*      $NetBSD: ofrtc.c,v 1.23 2011/07/26 08:59:38 mrg Exp $   */

/*
* Copyright (C) 1996 Wolfgang Solfrank.
* Copyright (C) 1996 TooLs GmbH.
* 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, 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.
* 3. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*      This product includes software developed by TooLs GmbH.
* 4. The name of TooLs GmbH may not be used to endorse or promote products
*    derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``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 TOOLS GMBH 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.
*/
/*
* Copyright 1997
* Digital Equipment Corporation. All rights reserved.
*
* This software is furnished under license and may be used and
* copied only in accordance with the following terms and conditions.
* Subject to these conditions, you may download, copy, install,
* use, modify and distribute this software in source and/or binary
* form. No title or ownership is transferred hereby.
*
* 1) Any source code used, modified or distributed must reproduce
*    and retain this copyright notice and list of conditions as
*    they appear in the source file.
*
* 2) No right is granted to use any trade name, trademark, or logo of
*    Digital Equipment Corporation. Neither the "Digital Equipment
*    Corporation" name nor any trademark or logo of Digital Equipment
*    Corporation may be used to endorse or promote products derived
*    from this software without the prior written permission of
*    Digital Equipment Corporation.
*
* 3) This software is provided "AS-IS" and any express or implied
*    warranties, including but not limited to, any implied warranties
*    of merchantability, fitness for a particular purpose, or
*    non-infringement are disclaimed. In no event shall DIGITAL be
*    liable for any damages whatsoever, and in particular, DIGITAL
*    shall not be liable for special, indirect, consequential, or
*    incidental damages or damages for lost profits, loss of
*    revenue or loss of use, whether such damages arise in contract,
*    negligence, tort, under statute, in equity, at law or otherwise,
*    even if advised of the possibility of such damage.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ofrtc.c,v 1.23 2011/07/26 08:59:38 mrg Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/conf.h>
#include <sys/event.h>

#include <dev/clock_subr.h>
#include <dev/ofw/openfirm.h>

#define OFRTC_SEC 0
#define OFRTC_MIN 1
#define OFRTC_HR  2
#define OFRTC_DOM 3
#define OFRTC_MON 4
#define OFRTC_YR  5

struct ofrtc_softc {
       int sc_phandle;
       int sc_ihandle;
       struct todr_chip_handle sc_todr;
};

static int ofrtc_match(device_t, cfdata_t, void *);
static void ofrtc_attach(device_t, device_t, void *);
static int ofrtc_gettod(todr_chip_handle_t, struct clock_ymdhms *);
static int ofrtc_settod(todr_chip_handle_t, struct clock_ymdhms *);

CFATTACH_DECL_NEW(ofrtc, sizeof(struct ofrtc_softc),
   ofrtc_match, ofrtc_attach, NULL, NULL);

static int
ofrtc_match(device_t parent, cfdata_t match, void *aux)
{
       struct ofbus_attach_args *oba = aux;
       char type[8];
       int l;

       if (strcmp(oba->oba_busname, "ofw"))
               return (0);
       if ((l = OF_getprop(oba->oba_phandle, "device_type", type,
           sizeof type - 1)) < 0 ||
           l >= sizeof type)
               return 0;

       /* ensure null termination */
       type[l] = 0;
       return !strcmp(type, "rtc");
}

static void
ofrtc_attach(device_t parent, device_t self, void *aux)
{
       struct ofrtc_softc *of = device_private(self);
       struct ofbus_attach_args *oba = aux;
       char name[32];
       char path[256];
       int l;

       of->sc_phandle = oba->oba_phandle;
       of->sc_ihandle = 0;
       if ((l = OF_getprop(of->sc_phandle, "name", name,
           sizeof name - 1)) < 0)
               panic("Device without name?");
       if (l >= sizeof name)
               l = sizeof name - 1;
       name[l] = 0;

       if (!of->sc_ihandle) {
               if ((l = OF_package_to_path(of->sc_phandle, path,
                        sizeof path - 1)) < 0 ||
                   l >= sizeof path) {
                       aprint_error(": cannot determine package path\n");
                       return;
               }
               path[l] = 0;

               if (!(of->sc_ihandle = OF_open(path))) {
                       aprint_error(": cannot open path\n");
                       return;
               }
       }

       of->sc_todr.todr_gettime_ymdhms = ofrtc_gettod;
       of->sc_todr.todr_settime_ymdhms = ofrtc_settod;
       of->sc_todr.cookie = of;
       todr_attach(&of->sc_todr);
       printf(": %s\n", name);
}

int
ofrtc_gettod(todr_chip_handle_t tch, struct clock_ymdhms *dt)
{
       struct ofrtc_softc *of = tch->cookie;
       int date[6];

       /*
        * We mostly ignore the suggested time and go for the RTC clock time
        * stored in the CMOS RAM.  If the time can't be obtained from the
        * CMOS, or if the time obtained from the CMOS is 5 or more years
        * less than the suggested time, we used the suggested time.  (In
        * the latter case, it's likely that the CMOS battery has died.)
        */

       if (OF_call_method("get-time", of->sc_ihandle, 0, 6,
           date, date + 1, date + 2, date + 3, date + 4, date + 5)) {
               return EIO;
       }

       dt->dt_sec = date[OFRTC_SEC];
       dt->dt_min = date[OFRTC_MIN];
       dt->dt_hour = date[OFRTC_HR];
       dt->dt_day = date[OFRTC_DOM];
       dt->dt_mon = date[OFRTC_MON];
       dt->dt_year = date[OFRTC_YR];

       return 0;
}

int
ofrtc_settod(todr_chip_handle_t tch, struct clock_ymdhms *dt)
{
       struct ofrtc_softc *of = tch->cookie;
       int sec, minute, hr, dom, mon, yr;

       sec = dt->dt_sec;
       minute = dt->dt_min;
       hr = dt->dt_hour;
       dom = dt->dt_day;
       mon = dt->dt_mon;
       yr = dt->dt_year;

       if (OF_call_method("set-time", of->sc_ihandle, 6, 0,
            sec, minute, hr, dom, mon, yr))
               return EIO;

       return 0;
}

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