/*      $NetBSD: rtc.c,v 1.21 2023/12/20 05:33:18 thorpej Exp $ */

/*
* Copyright (c) 2001 Valeriy E. Ushakov
* 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. 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.
*/

/*
* `rtc' is a DS1287A (== MC146818A) time-of-day clock at EBus.
* In Krups it's not used to store idprom so this driver doesn't
* support it.  Don't know about other ms-IIep systems.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: rtc.c,v 1.21 2023/12/20 05:33:18 thorpej Exp $");

#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/systm.h>
#ifdef GPROF
#include <sys/gmon.h>
#endif

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

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

#include <dev/ebus/ebusreg.h>
#include <dev/ebus/ebusvar.h>

struct rtc_ebus_softc {
       bus_space_tag_t         sc_bt;  /* parent bus tag */
       bus_space_handle_t      sc_bh;  /* handle for registers */
       struct todr_chip_handle sc_todr;/* TODR handle */
};

static int      rtcmatch_ebus(device_t, cfdata_t, void *);
static void     rtcattach_ebus(device_t, device_t, void *);

CFATTACH_DECL_NEW(rtc_ebus, sizeof(struct rtc_ebus_softc),
   rtcmatch_ebus, rtcattach_ebus, NULL, NULL);

/* todr(9) methods */
static int rtc_gettime_ymdhms(todr_chip_handle_t, struct clock_ymdhms *);
static int rtc_settime_ymdhms(todr_chip_handle_t, struct clock_ymdhms *);

int rtc_auto_century_adjust = 1; /* XXX: do we ever want not to? */

/*
* MD read/write functions declared in mc146818reg.h
*/
#define RTC_ADDR        0
#define RTC_DATA        1

u_int
mc146818_read(void *cookie, u_int reg)
{
       struct rtc_ebus_softc *sc = cookie;

       bus_space_write_1(sc->sc_bt, sc->sc_bh, RTC_ADDR, reg);
       return (bus_space_read_1(sc->sc_bt, sc->sc_bh, RTC_DATA));
}

void
mc146818_write(void *cookie, u_int reg, u_int datum)
{
       struct rtc_ebus_softc *sc = cookie;

       bus_space_write_1(sc->sc_bt, sc->sc_bh, RTC_ADDR, reg);
       bus_space_write_1(sc->sc_bt, sc->sc_bh, RTC_DATA, datum);
}


static int
rtcmatch_ebus(device_t parent, cfdata_t cf, void *aux)
{
       struct ebus_attach_args *ea = aux;

       return (strcmp(cf->cf_name, ea->ea_name) == 0);
}

static void
rtcattach_ebus(device_t parent, device_t self, void *aux)
{
       struct rtc_ebus_softc *sc = device_private(self);
       struct ebus_attach_args *ea = aux;
       todr_chip_handle_t handle;

       sc->sc_bt = ea->ea_bustag;
       if (bus_space_map(sc->sc_bt, EBUS_ADDR_FROM_REG(&ea->ea_reg[0]),
                         ea->ea_reg[0].size, 0, &sc->sc_bh) != 0)
       {
               printf(": unable to map registers\n");
               return;
       }

       /* XXX: no "model" property in Krups */
       printf(": time-of-day clock\n");

       /*
        * Turn interrupts off (clear MC_REGB_?IE bits), just in case
        * (although they shouldn't be wired to an interrupt
        * controller on sparcs).
        */
       mc146818_write(sc, MC_REGB, MC_REGB_BINARY | MC_REGB_24HR);

       /* setup our todr_handle */
       handle = &sc->sc_todr;
       handle->cookie = sc;
       handle->bus_cookie = NULL; /* unused */
       handle->todr_gettime = NULL;
       handle->todr_settime = NULL;
       handle->todr_gettime_ymdhms = rtc_gettime_ymdhms;
       handle->todr_settime_ymdhms = rtc_settime_ymdhms;
       handle->todr_setwen = NULL; /* not necessary, no idprom to protect */

       todr_attach(handle);
}


static int
rtc_gettime_ymdhms(todr_chip_handle_t handle, struct clock_ymdhms *dt)
{
       struct rtc_ebus_softc *sc = handle->cookie;
       u_int year;

       /* update in progress; spin loop */
       while (mc146818_read(sc, MC_REGA) & MC_REGA_UIP)
               continue;

       /* stop updates (XXX: do we need that???) */
       mc146818_write(sc, MC_REGB,
                      (mc146818_read(sc, MC_REGB) | MC_REGB_SET));

       /* read time */
       dt->dt_sec  = mc146818_read(sc, MC_SEC);
       dt->dt_min  = mc146818_read(sc, MC_MIN);
       dt->dt_hour = mc146818_read(sc, MC_HOUR);
       dt->dt_day  = mc146818_read(sc, MC_DOM);
       dt->dt_mon  = mc146818_read(sc, MC_MONTH);
       year        = mc146818_read(sc, MC_YEAR);

       /* reenable updates */
       mc146818_write(sc, MC_REGB,
                      (mc146818_read(sc, MC_REGB) & ~MC_REGB_SET));

       /* year in the century 0..99: adjust to AD */
       year += 1900;
       if (year < POSIX_BASE_YEAR && rtc_auto_century_adjust != 0)
               year += 100;
       dt->dt_year = year;

       return (0);
}

static int
rtc_settime_ymdhms(todr_chip_handle_t handle, struct clock_ymdhms *dt)
{
       struct rtc_ebus_softc *sc = handle->cookie;
       u_int year;

       year = dt->dt_year - 1900;
       if (year >= 100 && rtc_auto_century_adjust != 0)
               year -= 100;

       /* stop updates */
       mc146818_write(sc, MC_REGB,
                      (mc146818_read(sc, MC_REGB) | MC_REGB_SET));

       mc146818_write(sc, MC_SEC,   dt->dt_sec);
       mc146818_write(sc, MC_MIN,   dt->dt_min);
       mc146818_write(sc, MC_HOUR,  dt->dt_hour);
       mc146818_write(sc, MC_DOW,   dt->dt_wday + 1);
       mc146818_write(sc, MC_DOM,   dt->dt_day);
       mc146818_write(sc, MC_MONTH, dt->dt_mon);
       mc146818_write(sc, MC_YEAR,  year);

       /* reenable updates */
       mc146818_write(sc, MC_REGB,
                      (mc146818_read(sc, MC_REGB) & ~MC_REGB_SET));
       return (0);
}

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