/*      $NetBSD: rtc.c,v 1.23 2023/12/20 00:40:43 thorpej Exp $ */

/*
* Copyright (c) 1988 University of Utah.
* Copyright (c) 1982, 1990, 1993
*      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     8.2 (Berkeley) 1/12/94
*/

/*
* attachment for HP300 real-time clock (RTC)
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: rtc.c,v 1.23 2023/12/20 00:40:43 thorpej Exp $");

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

#include <hp300/dev/intiovar.h>
#include <hp300/dev/rtcreg.h>

#include <dev/clock_subr.h>

struct rtc_softc {
       device_t sc_dev;
       bus_space_tag_t sc_bst;
       bus_space_handle_t sc_bsh;
       struct todr_chip_handle sc_handle;
};

static int      rtcmatch(device_t, cfdata_t, void *);
static void     rtcattach(device_t, device_t, void *aux);

CFATTACH_DECL_NEW(rtc, sizeof(struct rtc_softc),
   rtcmatch, rtcattach, NULL, NULL);

static int      rtc_gettime_ymdhms(todr_chip_handle_t, struct clock_ymdhms *);
static int      rtc_settime_ymdhms(todr_chip_handle_t, struct clock_ymdhms *);
static uint8_t  rtc_readreg(struct rtc_softc *, int);
static uint8_t  rtc_writereg(struct rtc_softc *, int, uint8_t);


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

       /* 425e doesn't have the traditional RTC at intio */
       if (machineid == HP_425 && mmuid == MMUID_425_E)
               return 0;

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

       return 1;
}

static void
rtcattach(device_t parent, device_t self, void *aux)
{
       struct rtc_softc *sc = device_private(self);
       struct intio_attach_args *ia = aux;
       struct todr_chip_handle *todr_handle;
       bus_space_tag_t bst = ia->ia_bst;

       sc->sc_dev = self;
       if (bus_space_map(bst, ia->ia_iobase, INTIO_DEVSIZE, 0,
           &sc->sc_bsh)) {
               aprint_error(": can't map registers\n");
               return;
       }

       aprint_normal("\n");

       sc->sc_bst = bst;

       todr_handle = &sc->sc_handle;
       todr_handle->cookie = sc;
       todr_handle->todr_gettime = NULL;
       todr_handle->todr_settime = NULL;
       todr_handle->todr_gettime_ymdhms = rtc_gettime_ymdhms;
       todr_handle->todr_settime_ymdhms = rtc_settime_ymdhms;
       todr_handle->todr_setwen = NULL;

       todr_attach(todr_handle);
}

static int
rtc_gettime_ymdhms(todr_chip_handle_t handle, struct clock_ymdhms *dt)
{
       struct rtc_softc *sc;
       int i, year;
       bool read_okay;
       uint8_t rtc_registers[NUM_RTC_REGS];

       sc = handle->cookie;

       /* read rtc registers */
       read_okay = false;
       while (!read_okay) {
               read_okay = true;
               for (i = 0; i < NUM_RTC_REGS; i++)
                       rtc_registers[i] = rtc_readreg(sc, i);
               for (i = 0; i < NUM_RTC_REGS; i++)
                       if (rtc_registers[i] != rtc_readreg(sc, i))
                               read_okay = false;
       }

#define rtc_to_decimal(a,b)     (rtc_registers[a] * 10 + rtc_registers[b])

       dt->dt_sec  = rtc_to_decimal(1, 0);
       dt->dt_min  = rtc_to_decimal(3, 2);
       dt->dt_hour = (rtc_registers[5] & RTC_REG5_HOUR) * 10 +
           rtc_registers[4];
       dt->dt_day  = rtc_to_decimal(8, 7);
       dt->dt_mon  = rtc_to_decimal(10, 9);

       year = rtc_to_decimal(12, 11) + RTC_BASE_YEAR;
       if (year < POSIX_BASE_YEAR)
               year += 100;
       dt->dt_year = year;

#undef  rtc_to_decimal

       return 0;
}

static int
rtc_settime_ymdhms(todr_chip_handle_t handle, struct clock_ymdhms *dt)
{
       struct rtc_softc *sc;
       int i, year;
       uint8_t rtc_registers[NUM_RTC_REGS];

       sc = handle->cookie;
       year = dt->dt_year - RTC_BASE_YEAR;
       if (year > 99)
               year -= 100;

#define decimal_to_rtc(a,b,n)           \
       rtc_registers[a] = (n) % 10;    \
       rtc_registers[b] = (n) / 10;

       decimal_to_rtc(0, 1, dt->dt_sec);
       decimal_to_rtc(2, 3, dt->dt_min);
       decimal_to_rtc(7, 8, dt->dt_day);
       decimal_to_rtc(9, 10, dt->dt_mon);
       decimal_to_rtc(11, 12, year);

       rtc_registers[4] = dt->dt_hour % 10;
       rtc_registers[5] = ((dt->dt_hour / 10) & RTC_REG5_HOUR) | RTC_REG5_24HR;

       rtc_registers[6] = 0;

#undef  decimal_to_rtc

       /* write rtc registers */
       rtc_writereg(sc, 15, 13);       /* reset prescalar */
       for (i = 0; i < NUM_RTC_REGS; i++)
               if (rtc_registers[i] !=
                   rtc_writereg(sc, i, rtc_registers[i]))
                       return 1;
       return 0;
}

static uint8_t
rtc_readreg(struct rtc_softc *sc, int reg)
{
       bus_space_tag_t bst = sc->sc_bst;
       bus_space_handle_t bsh = sc->sc_bsh;
       uint8_t data;
       int s = splvm();

       data = reg;
       intio_device_writecmd(bst, bsh, RTC_SET_REG, &data, 1);
       intio_device_readcmd(bst, bsh, RTC_READ_REG, &data);

       splx(s);
       return data;
}

static uint8_t
rtc_writereg(struct rtc_softc *sc, int reg, uint8_t data)
{
       bus_space_tag_t bst = sc->sc_bst;
       bus_space_handle_t bsh = sc->sc_bsh;
       uint8_t tmp;
       int s = splvm();

       tmp = (data << 4) | reg;
       intio_device_writecmd(bst, bsh, RTC_SET_REG, &tmp, 1);
       intio_device_writecmd(bst, bsh, RTC_WRITE_REG, NULL, 0);
       intio_device_readcmd(bst, bsh, RTC_READ_REG, &tmp);

       splx(s);
       return tmp;
}

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