/*      $NetBSD: drbbc.c,v 1.22 2025/09/07 21:45:10 thorpej Exp $ */

/*-
 * Copyright (c) 1997 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Ignatios Souvatzis.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: drbbc.c,v 1.22 2025/09/07 21:45:10 thorpej Exp $");

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

#if 0
#include <machine/psl.h>
#endif
#include <machine/cpu.h>
#include <amiga/amiga/device.h>
#include <amiga/amiga/custom.h>
#include <amiga/amiga/cia.h>
#include <amiga/amiga/drcustom.h>
#include <amiga/dev/rtc.h>

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

static int      draco_ds_read_bit(void *);
static void     draco_ds_write_bit(void *, int);
static void     draco_ds_reset(void *);

static void     drbbc_attach(device_t, device_t, void *);
static int      drbbc_match(device_t, cfdata_t, void *);

static int      dracougettod(todr_chip_handle_t, struct timeval *);
static int      dracousettod(todr_chip_handle_t, struct timeval *);

struct drbbc_softc {
        device_t sc_dev;
        struct ds_handle sc_dsh;
        struct todr_chip_handle sc_todr;
};

CFATTACH_DECL_NEW(drbbc, sizeof(struct drbbc_softc),
    drbbc_match, drbbc_attach, NULL, NULL);

static int
drbbc_match(device_t parent, cfdata_t cf, void *aux)
{
        static int drbbc_matched = 0;

        /* Allow only one instance. */
        if (!is_draco() || !matchname(aux, "drbbc") || drbbc_matched)
                return (0);

        drbbc_matched = 1;
        return (1);
}

static void
drbbc_attach(device_t parent, device_t self, void *aux)
{
        int i;
        struct drbbc_softc *sc;
        u_int8_t rombuf[8];

        sc = device_private(self);
        sc->sc_dev = self;

        sc->sc_dsh.ds_read_bit = draco_ds_read_bit;
        sc->sc_dsh.ds_write_bit = draco_ds_write_bit;
        sc->sc_dsh.ds_reset = draco_ds_reset;
        sc->sc_dsh.ds_hw_handle = (void *)(DRCCADDR + DRIOCTLPG*PAGE_SIZE);

        sc->sc_dsh.ds_reset(sc->sc_dsh.ds_hw_handle);

        ds_write_byte(&sc->sc_dsh, DS_ROM_READ);
        for (i=0; i<8; ++i)
                rombuf[i] = ds_read_byte(&sc->sc_dsh);

        hostid = (rombuf[3] << 24) + (rombuf[2] << 16) +
                (rombuf[1] << 8) + rombuf[7];

        printf(": ROM %02x %02x%02x%02x%02x%02x%02x %02x (DraCo sernum %ld)\n",
                rombuf[7], rombuf[6], rombuf[5], rombuf[4],
                rombuf[3], rombuf[2], rombuf[1], rombuf[0],
                hostid);

        sc->sc_todr.todr_dev = self;
        sc->sc_todr.todr_gettime = dracougettod;
        sc->sc_todr.todr_settime = dracousettod;
        todr_attach(&sc->sc_todr);
}

static int
draco_ds_read_bit(void *p)
{
        struct drioct *draco_ioctl;

        draco_ioctl = p;

        while (draco_ioctl->io_status & DRSTAT_CLKBUSY);

        draco_ioctl->io_clockw1 = 0;

        while (draco_ioctl->io_status & DRSTAT_CLKBUSY);

        return (draco_ioctl->io_status & DRSTAT_CLKDAT);
}

static void
draco_ds_write_bit(void *p, int b)
{
        struct drioct *draco_ioctl;

        draco_ioctl = p;

        while (draco_ioctl->io_status & DRSTAT_CLKBUSY);

        if (b)
                draco_ioctl->io_clockw1 = 0;
        else
                draco_ioctl->io_clockw0 = 0;
}

static void
draco_ds_reset(void *p)
{
        struct drioct *draco_ioctl;

        draco_ioctl = p;

        draco_ioctl->io_clockrst = 0;
}

static int
dracougettod(todr_chip_handle_t h, struct timeval *tvp)
{
        struct drbbc_softc *sc = device_private(h->todr_dev);
        u_int32_t clkbuf;
        u_int32_t usecs;

        sc->sc_dsh.ds_reset(sc->sc_dsh.ds_hw_handle);

        ds_write_byte(&sc->sc_dsh, DS_ROM_SKIP);

        ds_write_byte(&sc->sc_dsh, DS_MEM_READ_MEMORY);
        /* address of seconds/256: */
        ds_write_byte(&sc->sc_dsh, 0x02);
        ds_write_byte(&sc->sc_dsh, 0x02);

        usecs = (ds_read_byte(&sc->sc_dsh) * 1000000) / 256;
        clkbuf = ds_read_byte(&sc->sc_dsh)
            + (ds_read_byte(&sc->sc_dsh)<<8)
            + (ds_read_byte(&sc->sc_dsh)<<16)
            + (ds_read_byte(&sc->sc_dsh)<<24);

        /* BSD time is wrt. 1.1.1970; AmigaOS time wrt. 1.1.1978 */

        clkbuf += (8*365 + 2) * 86400;

        tvp->tv_sec = clkbuf;
        tvp->tv_usec = usecs;

        return (0);
}

static int
dracousettod(todr_chip_handle_t h, struct timeval *tvp)
{
        return (ENXIO);
}