/*      $OpenBSD: plrtc.c,v 1.4 2022/10/17 19:09:46 kettenis Exp $      */

/*
 * Copyright (c) 2015 Jonathan Gray <jsg@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

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

#include <machine/bus.h>
#include <machine/fdt.h>
#include <dev/clock_subr.h>

#include <dev/ofw/openfirm.h>
#include <dev/ofw/fdt.h>

#define RTCDR   0x00
#define RTCMR   0x04
#define RTCLR   0x08
#define RTCCR   0x0c
#define RTCIMSC 0x10
#define RTCRIS  0x14
#define RTCMIS  0x18
#define RTCICR  0x1c

#define RTCCR_START     (1 << 0)

struct plrtc_softc {
        struct device            sc_dev;
        bus_space_tag_t          sc_iot;
        bus_space_handle_t       sc_ioh;
};

int     plrtc_match(struct device *, void *, void *);
void    plrtc_attach(struct device *, struct device *, void *);
int     plrtc_gettime(struct todr_chip_handle *, struct timeval *);
int     plrtc_settime(struct todr_chip_handle *, struct timeval *);


const struct cfattach plrtc_ca = {
        sizeof(struct plrtc_softc), plrtc_match, plrtc_attach
};

struct cfdriver plrtc_cd = {
        NULL, "plrtc", DV_DULL
};

int
plrtc_gettime(todr_chip_handle_t handle, struct timeval *tv)
{
        struct plrtc_softc      *sc = handle->cookie;
        uint32_t                 tod;

        tod = bus_space_read_4(sc->sc_iot, sc->sc_ioh, RTCDR);

        tv->tv_sec = tod;
        tv->tv_usec = 0;

        return (0);
}

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

        bus_space_write_4(sc->sc_iot, sc->sc_ioh, RTCLR, tv->tv_sec);

        return (0);
}

int
plrtc_match(struct device *parent, void *match, void *aux)
{
        struct fdt_attach_args *faa = aux;

        return (OF_is_compatible(faa->fa_node, "arm,pl031"));
}

void
plrtc_attach(struct device *parent, struct device *self, void *aux)
{
        struct fdt_attach_args          *faa = aux;
        struct plrtc_softc              *sc = (struct plrtc_softc *) self;
        todr_chip_handle_t               handle;

        if (faa->fa_nreg < 1) {
                printf(": no register data\n");
                return;
        }

        sc->sc_iot = faa->fa_iot;
        if (bus_space_map(sc->sc_iot, faa->fa_reg[0].addr,
            faa->fa_reg[0].size, 0, &sc->sc_ioh)) {
                printf(": failed to map mem space\n");
                return;
        }

        handle = malloc(sizeof(struct todr_chip_handle), M_DEVBUF,
            M_NOWAIT | M_ZERO);
        if (handle == NULL)
                panic("couldn't allocate todr_handle");

        handle->cookie = sc;
        handle->todr_gettime = plrtc_gettime;
        handle->todr_settime = plrtc_settime;
        handle->todr_quality = 0;
        todr_attach(handle);

        /* enable the rtc */
        bus_space_write_4(sc->sc_iot, sc->sc_ioh, RTCCR, RTCCR_START);

        printf("\n");
}