/*      $NetBSD: j720ssp.c,v 1.34 2021/08/07 16:18:53 thorpej Exp $     */

/*-
 * Copyright (c) 2001, 2006 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by IWAMOTO Toshihiro. 
 *
 * 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.
 */

/* Jornada 720 SSP port. */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: j720ssp.c,v 1.34 2021/08/07 16:18:53 thorpej Exp $");

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

#include <arm/sa11x0/sa11x0_var.h>
#include <arm/sa11x0/sa11x0_gpioreg.h>
#include <arm/sa11x0/sa11x0_ppcreg.h>
#include <arm/sa11x0/sa11x0_sspreg.h>

#include <hpcarm/dev/j720sspvar.h>

#ifdef DEBUG
#define DPRINTF(arg)    aprint_normal arg
#else
#define DPRINTF(arg)    /* nothing */
#endif

#define BIT_INVERT(x)                                                   \
        do {                                                            \
                (x) = ((((x) & 0xf0) >> 4) | (((x) & 0x0f) << 4));      \
                (x) = ((((x) & 0xcc) >> 2) | (((x) & 0x33) << 2));      \
                (x) = ((((x) & 0xaa) >> 1) | (((x) & 0x55) << 1));      \
        } while (0)

static int      j720ssp_match(device_t, cfdata_t, void *);
static void     j720ssp_attach(device_t, device_t, void *);
static int      j720ssp_search(device_t, cfdata_t, const int *, void *);
static int      j720ssp_print(void *, const char *);

CFATTACH_DECL_NEW(j720ssp, sizeof(struct j720ssp_softc),
    j720ssp_match, j720ssp_attach, NULL, NULL);


static int
j720ssp_match(device_t parent, cfdata_t cf, void *aux)
{

        if (strcmp(cf->cf_name, "j720ssp") != 0)
                return 0;

        return 1;
}

static void
j720ssp_attach(device_t parent, device_t self, void *aux)
{
        struct j720ssp_softc *sc = device_private(self);
        struct sa11x0_softc *psc = device_private(parent);
        struct sa11x0_attach_args *sa = aux;

        sc->sc_dev = self;
        sc->sc_iot = psc->sc_iot;
        sc->sc_gpioh = psc->sc_gpioh;
        sc->sc_parent = psc;

        if (bus_space_map(sc->sc_iot, sa->sa_addr, sa->sa_size, 0,
            &sc->sc_ssph)) {
                aprint_normal(": unable to map SSP registers\n");
                return;
        }

        aprint_normal("\n");

        config_search(self, NULL,
            CFARGS(.search = j720ssp_search));
}

static int
j720ssp_search(device_t parent, cfdata_t cf, const int *ldesc, void *aux)
{

        if (config_probe(parent, cf, NULL))
                config_attach(parent, cf, NULL, j720ssp_print, CFARGS_NONE);

        return 0;
}

static int
j720ssp_print(void *aux, const char *pnp)
{

        return pnp ? QUIET : UNCONF;
}

int
j720ssp_readwrite(struct j720ssp_softc *sc, int drainfifo, int in,
    int *out, int wait)
{
        int timeout;

        while (!(bus_space_read_4(sc->sc_iot, sc->sc_ssph, SASSP_SR) & SR_TNF))
                continue;

        timeout = 400000;
        while (bus_space_read_4(sc->sc_iot, sc->sc_gpioh, SAGPIO_PLR) & 0x400)
                if (--timeout == 0) {
                        DPRINTF(("j720ssp_readwrite: timeout 0\n"));
                        return -1;
                }
        if (drainfifo) {
                while (bus_space_read_4(sc->sc_iot, sc->sc_ssph, SASSP_SR) &
                      SR_RNE)
                        bus_space_read_4(sc->sc_iot, sc->sc_ssph, SASSP_DR);
                delay(wait);
        }

        BIT_INVERT(in);
        bus_space_write_4(sc->sc_iot, sc->sc_ssph, SASSP_DR, in << 8);

        delay(wait);
        timeout = 100000;
        while (!(bus_space_read_4(sc->sc_iot, sc->sc_ssph, SASSP_SR) & SR_RNE))
                if (--timeout == 0) {
                        DPRINTF(("j720ssp_readwrite: timeout 1\n"));
                        return -1;
                }

        *out = bus_space_read_4(sc->sc_iot, sc->sc_ssph, SASSP_DR);
        BIT_INVERT(*out);

        return 0;
}