/*      $NetBSD: rtclock.c,v 1.26 2025/09/07 21:45:15 thorpej Exp $     */

/*
 * Copyright 1993, 1994 Masaru Oki
 * 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 Masaru Oki.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
 */

/*
 * X680x0 internal real time clock interface
 * alarm is not supported.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: rtclock.c,v 1.26 2025/09/07 21:45:15 thorpej Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <sys/reboot.h>
#include <sys/file.h>
#include <sys/kernel.h>
#include <sys/device.h>

#include <machine/bus.h>

#include <dev/clock_subr.h>

#include <arch/x68k/dev/rtclock_var.h>
#include <arch/x68k/dev/intiovar.h>

static int rtgettod(todr_chip_handle_t, struct clock_ymdhms *);
static int rtsettod(todr_chip_handle_t, struct clock_ymdhms *);

static int rtc_match(device_t, cfdata_t, void *);
static void rtc_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(rtc, sizeof(struct rtc_softc),
    rtc_match, rtc_attach, NULL, NULL);

static int rtc_attached;

static int
rtc_match(device_t parent, cfdata_t cf, void *aux)
{
        struct intio_attach_args *ia = aux;

        if (strcmp(ia->ia_name, "rtc") != 0)
                return (0);
        if (rtc_attached)
                return (0);

        /* fixed address */
        if (ia->ia_addr != RTC_ADDR)
                return (0);
        if (ia->ia_intr != -1)
                return (0);

        return (1);
}

static void
rtc_attach(device_t parent, device_t self, void *aux)
{
        struct rtc_softc *sc = device_private(self);
        struct intio_attach_args *ia = aux;
        int r __diagused;

        rtc_attached = 1;

        ia->ia_size = 0x20;
        r = intio_map_allocate_region(parent, ia, INTIO_MAP_ALLOCATE);
#ifdef DIAGNOSTIC
        if (r)
                panic("IO map for RTC corruption??");
#endif


        sc->sc_bst = ia->ia_bst;
        bus_space_map(sc->sc_bst, ia->ia_addr, 0x2000, 0, &sc->sc_bht);

        sc->sc_todr.todr_dev = self;
        sc->sc_todr.todr_gettime_ymdhms = rtgettod;
        sc->sc_todr.todr_settime_ymdhms = rtsettod;
        todr_attach(&sc->sc_todr);

        aprint_normal(": RP5C15\n");
}

static int
rtgettod(todr_chip_handle_t tch, struct clock_ymdhms *dt)
{
        struct rtc_softc *rtc = device_private(tch->todr_dev);

        /* hold clock */
        RTC_WRITE(RTC_MODE, RTC_HOLD_CLOCK);

        /* read it */
        dt->dt_sec  = RTC_REG(RTC_SEC10)  * 10 + RTC_REG(RTC_SEC);
        dt->dt_min  = RTC_REG(RTC_MIN10)  * 10 + RTC_REG(RTC_MIN);
        dt->dt_hour = RTC_REG(RTC_HOUR10) * 10 + RTC_REG(RTC_HOUR);
        dt->dt_day  = RTC_REG(RTC_DAY10)  * 10 + RTC_REG(RTC_DAY);
        dt->dt_mon  = RTC_REG(RTC_MON10)  * 10 + RTC_REG(RTC_MON);
        dt->dt_year = RTC_REG(RTC_YEAR10) * 10 + RTC_REG(RTC_YEAR)
                                                        +RTC_BASE_YEAR;

        /* let it run again.. */
        RTC_WRITE(RTC_MODE, RTC_FREE_CLOCK);

        return 0;
}

static int
rtsettod(todr_chip_handle_t tch, struct clock_ymdhms *dt)
{
        struct rtc_softc *rtc = device_private(tch->todr_dev);
        u_char sec1, sec2;
        u_char min1, min2;
        u_char hour1, hour2;
        u_char day1, day2;
        u_char mon1, mon2;
        u_char year1, year2;

        /* prepare values to be written to clock */
        sec1  = dt->dt_sec  / 10;
        sec2  = dt->dt_sec  % 10;
        min1  = dt->dt_min  / 10;
        min2  = dt->dt_min  % 10;
        hour1 = dt->dt_hour / 10;
        hour2 = dt->dt_hour % 10;

        day1  = dt->dt_day  / 10;
        day2  = dt->dt_day  % 10;
        mon1  = dt->dt_mon  / 10;
        mon2  = dt->dt_mon  % 10;
        year1 = (dt->dt_year - RTC_BASE_YEAR) / 10;
        year2 = dt->dt_year % 10;

        RTC_WRITE(RTC_MODE,   RTC_HOLD_CLOCK);
        RTC_WRITE(RTC_SEC10,  sec1);
        RTC_WRITE(RTC_SEC,    sec2);
        RTC_WRITE(RTC_MIN10,  min1);
        RTC_WRITE(RTC_MIN,    min2);
        RTC_WRITE(RTC_HOUR10, hour1);
        RTC_WRITE(RTC_HOUR,   hour2);
        RTC_WRITE(RTC_DAY10,  day1);
        RTC_WRITE(RTC_DAY,    day2);
        RTC_WRITE(RTC_MON10,  mon1);
        RTC_WRITE(RTC_MON,    mon2);
        RTC_WRITE(RTC_YEAR10, year1);
        RTC_WRITE(RTC_YEAR,   year2);
        RTC_WRITE(RTC_MODE,   RTC_FREE_CLOCK);

        return 0;
}