/* $NetBSD: pl031.c,v 1.1 2017/06/08 21:00:43 jmcneill Exp $ */

/*-
* Copyright (c) 2017 Jared McNeill <[email protected]>
* 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.
*
* 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.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: pl031.c,v 1.1 2017/06/08 21:00:43 jmcneill Exp $");

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

#include <dev/clock_subr.h>

#include <dev/ic/pl031var.h>

#define RTCDR   0x000
#define RTCLR   0x008
#define RTCCR   0x00c
#define  RTCCR_START    __BIT(0)

#define RTC_READ(sc, reg)                       \
       bus_space_read_4((sc)->sc_bst, (sc)->sc_bsh, (reg))
#define RTC_WRITE(sc, reg, val)         \
       bus_space_write_4((sc)->sc_bst, (sc)->sc_bsh, (reg), (val))

static int
plrtc_gettime(todr_chip_handle_t tch, struct timeval *tv)
{
       struct plrtc_softc * const sc = tch->cookie;

       tv->tv_sec = RTC_READ(sc, RTCDR);
       tv->tv_usec = 0;

       return 0;
}

static int
plrtc_settime(todr_chip_handle_t tch, struct timeval *tv)
{
       struct plrtc_softc * const sc = tch->cookie;

       RTC_WRITE(sc, RTCLR, tv->tv_sec);

       return 0;
}

void
plrtc_attach(struct plrtc_softc *sc)
{
       aprint_naive("\n");
       aprint_normal(": RTC\n");

       sc->sc_todr.todr_gettime = plrtc_gettime;
       sc->sc_todr.todr_settime = plrtc_settime;
       sc->sc_todr.cookie = sc;

       RTC_WRITE(sc, RTCCR, RTCCR_START);
}