/* $NetBSD: imx23_digctl.c,v 1.7 2026/02/02 09:51:40 yurix Exp $ */

/*
* Copyright (c) 2013 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Petri Laakso.
*
* 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/param.h>
#include <sys/types.h>
#include <sys/bus.h>
#include <sys/cdefs.h>
#include <sys/device.h>
#include <sys/errno.h>
#include <sys/timetc.h>

#include <dev/fdt/fdtvar.h>

#include <arm/imx/imx23_digctlreg.h>
#include <arm/imx/imx23var.h>

struct imx23_digctl_softc {
        device_t sc_dev;
        bus_space_tag_t sc_iot;
        bus_space_handle_t sc_hdl;
};

static int      imx23_digctl_match(device_t, cfdata_t, void *);
static void     imx23_digctl_attach(device_t, device_t, void *);

static void     imx23_digctl_init(struct imx23_digctl_softc *);

/* timecounter. */
static u_int imx23_digctl_tc_get_timecount(struct timecounter *);

static struct imx23_digctl_softc *_sc = NULL;

CFATTACH_DECL_NEW(imx23digctl, sizeof(struct imx23_digctl_softc),
                  imx23_digctl_match, imx23_digctl_attach, NULL, NULL);

static struct timecounter tc_useconds;

#define DCTL_RD(sc, reg)                                                 \
        bus_space_read_4(sc->sc_iot, sc->sc_hdl, (reg))
#define DCTL_WR(sc, reg, val)                                            \
        bus_space_write_4(sc->sc_iot, sc->sc_hdl, (reg), (val))

static const struct device_compatible_entry compat_data[] = {
        { .compat = "fsl,imx23-digctl" },
        DEVICE_COMPAT_EOL
};

static int
imx23_digctl_match(device_t parent, cfdata_t match, void *aux)
{
        struct fdt_attach_args * const faa = aux;

        return of_compatible_match(faa->faa_phandle, compat_data);
}

static void
imx23_digctl_attach(device_t parent, device_t self, void *aux)
{
        struct imx23_digctl_softc * const sc = device_private(self);
        struct fdt_attach_args * const faa = aux;
        const int phandle = faa->faa_phandle;

        sc->sc_dev = self;
        sc->sc_iot = faa->faa_bst;

        bus_addr_t addr;
        bus_size_t size;
        if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
                aprint_error(": couldn't get register address\n");
                return;
        }
        if (bus_space_map(faa->faa_bst, addr, size, 0, &sc->sc_hdl)) {
                aprint_error(": couldn't map registers\n");
                return;
        }

        aprint_normal("\n");

        imx23_digctl_init(sc);

        /*
         * Setup timecounter to use digctl microseconds counter.
         */
        tc_useconds.tc_get_timecount = imx23_digctl_tc_get_timecount;
        tc_useconds.tc_poll_pps = NULL;
        tc_useconds.tc_counter_mask = 0xffffffff; /* 32bit counter. */
        tc_useconds.tc_frequency = 1000000;       /* @ 1MHz */
        tc_useconds.tc_name = "digctl";
        tc_useconds.tc_quality = 100;

        /* Enable counter. */
        DCTL_WR(sc, HW_DIGCTL_CTRL_CLR, HW_DIGCTL_CTRL_XTAL24M_GATE);

        tc_init(&tc_useconds);

        /* Enable USB clocks */
        DCTL_WR(sc, HW_DIGCTL_CTRL_CLR, HW_DIGCTL_CTRL_USB_CLKGATE);
}

static void
imx23_digctl_init(struct imx23_digctl_softc *sc)
{
        _sc = sc;
}

/*
 *
 */
static u_int
imx23_digctl_tc_get_timecount(struct timecounter *tc)
{
        struct imx23_digctl_softc *sc = _sc;
        return DCTL_RD(sc, HW_DIGCTL_MICROSECONDS);
}