/*      $NetBSD: rtc.c,v 1.9 2023/06/27 19:30:27 andvar Exp $   */

/*
* Copyright (c) 1992, 1993
*      The Regents of the University of California.  All rights reserved.
* Copyright (c) 1994 Gordon W. Ross
* Copyright (c) 1993 Adam Glass
* Copyright (c) 1996 Paul Kranenburg
* Copyright (c) 1996
*      The President and Fellows of Harvard College. All rights reserved.
*
* This software was developed by the Computer Systems Engineering group
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
* contributed to Berkeley.
*
* All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
*      This product includes software developed by Harvard University.
*      This product includes software developed by the University of
*      California, Lawrence Berkeley Laboratory.
*
* 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 the University of
*      California, Berkeley and its contributors.
*      This product includes software developed by Paul Kranenburg.
*      This product includes software developed by Harvard University.
* 4. 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.
*
*      @(#)clock.c     8.1 (Berkeley) 6/11/93
* from: NetBSD: clock.c,v 1.80 2006/09/03 22:27:45 gdamore Exp
*
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: rtc.c,v 1.9 2023/06/27 19:30:27 andvar Exp $");

/*
* Clock driver for 'rtc' - mc146818 driver.
*/

#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/proc.h>

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

#include <dev/clock_subr.h>
#include <dev/ic/mc146818reg.h>
#include <dev/ic/mc146818var.h>

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

static int      rtc_ebus_match(device_t, cfdata_t, void *);
static void     rtc_ebus_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(rtc_ebus, sizeof(struct mc146818_softc),
   rtc_ebus_match, rtc_ebus_attach, NULL, NULL);

u_int rtc_read_reg(struct mc146818_softc *, u_int);
void rtc_write_reg(struct mc146818_softc *, u_int, u_int);
u_int rtc_getcent(struct mc146818_softc *);
void rtc_setcent(struct mc146818_softc *, u_int);

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

       return (strcmp("rtc", ea->ea_name) == 0);
}

/*
* `rtc' is a ds1287 on an ebus (actually an isa bus, but we use the
* ebus driver for isa.)  So we can use ebus_wenable() but need to do
* different attach work and use different todr routines.  It does not
* incorporate an IDPROM.
*/

/*
* XXX the stupid ds1287 is not mapped directly but uses an address
* and a data reg so we cannot access the stuuupid thing w/o having
* write access to the registers.
*
* XXXX We really need to mutex register access!
*/
#define RTC_ADDR        0
#define RTC_DATA        1
u_int
rtc_read_reg(struct mc146818_softc *sc, u_int reg)
{

       bus_space_write_1(sc->sc_bst, sc->sc_bsh, RTC_ADDR, reg);
       return (bus_space_read_1(sc->sc_bst, sc->sc_bsh, RTC_DATA));
}
void
rtc_write_reg(struct mc146818_softc *sc, u_int reg, u_int val)
{

       bus_space_write_1(sc->sc_bst, sc->sc_bsh, RTC_ADDR, reg);
       bus_space_write_1(sc->sc_bst, sc->sc_bsh, RTC_DATA, val);
}

/* ARGSUSED */
static void
rtc_ebus_attach(device_t parent, device_t self, void *aux)
{
       struct mc146818_softc *sc = device_private(self);
       struct ebus_attach_args *ea = aux;
       char *model;
       int sz;

       sc->sc_dev = self;
       sc->sc_bst = ea->ea_bustag;

       /* hard code to 8K? */
       sz = ea->ea_reg[0].size;

       if (bus_space_map(sc->sc_bst,
                        EBUS_ADDR_FROM_REG(&ea->ea_reg[0]),
                        sz, 0,
                        &sc->sc_bsh) != 0) {
               aprint_error(": can't map register\n");
               return;
       }

       model = prom_getpropstring(ea->ea_node, "model");
#ifdef DIAGNOSTIC
       if (model == NULL)
               panic("clockattach_rtc: no model property");
#endif

       /* Our TOD clock year 0 is 0 */
       sc->sc_year0 = 0;
       sc->sc_flag = MC146818_NO_CENT_ADJUST;
       sc->sc_mcread = rtc_read_reg;
       sc->sc_mcwrite = rtc_write_reg;
       sc->sc_getcent = rtc_getcent;
       sc->sc_setcent = rtc_setcent;
       mc146818_attach(sc);

       aprint_normal(": %s\n", model);
       aprint_naive(": Clock\n");

       /*
        * Turn interrupts off, just in case. (Although they shouldn't
        * be wired to an interrupt controller on sparcs).
        */
       rtc_write_reg(sc, MC_REGB, MC_REGB_BINARY | MC_REGB_24HR);

       /*
        * Apparently on some machines the TOD registers are on the same
        * physical page as the COM registers.  So we won't protect them.
        */
       /*sc->sc_handle.todr_setwen = NULL;*/
}

/*
* MD mc146818 RTC todr routines.
*/

/* Looks like Sun stores the century info somewhere in CMOS RAM */
#define MC_CENT 0x32

u_int
rtc_getcent(struct mc146818_softc *sc)
{

       return rtc_read_reg(sc, MC_CENT);
}
void
rtc_setcent(struct mc146818_softc *sc, u_int cent)
{

       rtc_write_reg(sc, MC_CENT, cent);
}

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