/*      $NetBSD: a34kbbc.c,v 1.25 2025/09/07 21:45:10 thorpej Exp $ */

/*
 * Copyright (c) 1988 University of Utah.
 * Copyright (c) 1982, 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Systems Programming Group of the University of Utah Computer
 * Science Department.
 *
 * 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. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 *
 * from: Utah $Hdr: clock.c 1.18 91/01/21$
 *
 *      @(#)clock.c     7.6 (Berkeley) 5/7/91
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: a34kbbc.c,v 1.25 2025/09/07 21:45:10 thorpej Exp $");

#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/systm.h>
#include <machine/psl.h>
#include <machine/cpu.h>
#include <amiga/amiga/device.h>
#include <amiga/amiga/custom.h>
#include <amiga/amiga/cia.h>
#include <amiga/dev/rtc.h>
#include <amiga/dev/zbusvar.h>

#include <dev/clock_subr.h>

static int      a34kbbc_match(device_t, cfdata_t, void *);
static void     a34kbbc_attach(device_t, device_t, void *);

struct a34kbbc_softc {
        device_t sc_dev;
        struct todr_chip_handle sc_todr;
        volatile struct rtclock3000 *sc_addr;
};

CFATTACH_DECL_NEW(a34kbbc, sizeof(struct a34kbbc_softc),
    a34kbbc_match, a34kbbc_attach, NULL, NULL);

static int      a34kbbc_read(volatile struct rtclock3000 *,
                    struct clock_ymdhms *);
static int      a34kugettod(todr_chip_handle_t, struct clock_ymdhms *);
static int      a34kusettod(todr_chip_handle_t, struct clock_ymdhms *);

static int
a34kbbc_match(device_t parent, cfdata_t cf, void *aux)
{
        struct clock_ymdhms dt;
        static int a34kbbc_matched = 0;

        if (!matchname("a34kbbc", aux))
                return(0);

        /* Allow only one instance. */
        if (a34kbbc_matched)
                return(0);

        if (!(is_a3000() || is_a4000()))
                return(0);

        if (a34kbbc_read(ztwomap(0xdc0000), &dt) != 0)
                return(0);

        a34kbbc_matched = 1;
        return(1);
}

/*
 * Attach us to the rtc function pointers.
 */
static void
a34kbbc_attach(device_t parent, device_t self, void *aux)
{
        struct a34kbbc_softc *sc = device_private(self);

        printf("\n");

        sc->sc_dev = self;
        sc->sc_addr = ztwomap(0xdc0000);

        sc->sc_todr.todr_dev = self;
        sc->sc_todr.todr_gettime_ymdhms = a34kugettod;
        sc->sc_todr.todr_settime_ymdhms = a34kusettod;
        todr_attach(&sc->sc_todr);
}

static int
a34kbbc_read(volatile struct rtclock3000 *rt, struct clock_ymdhms *dt)
{

        /* hold clock */
        rt->control1 = A3CONTROL1_HOLD_CLOCK;

        /* Copy the info.  Careful about the order! */
        dt->dt_sec   = rt->second1 * 10 + rt->second2;
        dt->dt_min   = rt->minute1 * 10 + rt->minute2;
        dt->dt_hour  = rt->hour1   * 10 + rt->hour2;
        dt->dt_wday  = rt->weekday;
        dt->dt_day   = rt->day1    * 10 + rt->day2;
        dt->dt_mon   = rt->month1  * 10 + rt->month2;
        dt->dt_year  = rt->year1   * 10 + rt->year2;

        dt->dt_year += CLOCK_BASE_YEAR;
        /* let it run again.. */
        rt->control1 = A3CONTROL1_FREE_CLOCK;

        if (dt->dt_year < STARTOFTIME)
                dt->dt_year += 100;

        /*
         * These checks are mostly redundant against those already in the
         * generic todr, but apparently the attach code checks against the
         * return value of this function, so we have to include a check here,
         * too.
         */
        if ((dt->dt_hour > 23) ||
            (dt->dt_wday > 6) ||
            (dt->dt_day  > 31) ||
            (dt->dt_mon  > 12) ||
            /* (dt.dt_year < STARTOFTIME) || */ (dt->dt_year > 2036))
                return (EINVAL);

        return (0);
}

static int
a34kugettod(todr_chip_handle_t h, struct clock_ymdhms *dt)
{
        struct a34kbbc_softc *sc = device_private(h->todr_dev);

        return a34kbbc_read(sc->sc_addr, dt);
}

static int
a34kusettod(todr_chip_handle_t h, struct clock_ymdhms *dt)
{
        struct a34kbbc_softc *sc = device_private(h->todr_dev);
        volatile struct rtclock3000 *rt = sc->sc_addr;

        /*
         * there seem to be problems with the bitfield addressing
         * currently used..
         */

        rt->control1 = A3CONTROL1_HOLD_CLOCK;           /* implies mode 0 */
        rt->second1 = dt->dt_sec / 10;
        rt->second2 = dt->dt_sec % 10;
        rt->minute1 = dt->dt_min / 10;
        rt->minute2 = dt->dt_min % 10;
        rt->hour1   = dt->dt_hour / 10;
        rt->hour2   = dt->dt_hour % 10;
        rt->weekday = dt->dt_wday;
        rt->day1    = dt->dt_day / 10;
        rt->day2    = dt->dt_day % 10;
        rt->month1  = dt->dt_mon / 10;
        rt->month2  = dt->dt_mon % 10;
        rt->year1   = (dt->dt_year / 10) % 10;
        rt->year2   = dt->dt_year % 10;
        rt->control1 = A3CONTROL1_HOLD_CLOCK | 1;       /* mode 1 registers */
        rt->leapyear = dt->dt_year;             /* XXX implicit % 4 */
        rt->control1 = A3CONTROL1_FREE_CLOCK;           /* implies mode 1 */

        return (0);
}