/*      $NetBSD: brh_7seg.c,v 1.6 2012/11/12 18:00:38 skrll Exp $       */

/*
 * Copyright (c) 2001, 2002 Wasabi Systems, Inc.
 * All rights reserved.
 *
 * Written by Jason R. Thorpe for Wasabi Systems, Inc.
 *
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed for the NetBSD Project by
 *      Wasabi Systems, Inc.
 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
 *    or promote products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
 * 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.
 */

/*
 * Support for the 7-segment display on the ADI Engineering BRH board.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: brh_7seg.c,v 1.6 2012/11/12 18:00:38 skrll Exp $");

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

#include <sys/bus.h>

#include <evbarm/adi_brh/brhreg.h>
#include <evbarm/adi_brh/brhvar.h>

#define WRITE(x, v)     *((volatile uint8_t *) (x)) = (v)

static int snakestate;

static const uint8_t digitmap[] = {
/*      +#####+
 *      #     #
 *      #     #
 *      #     #
 *      +-----+
 *      #     #
 *      #     #
 *      #     #
 *      +#####+
 */
        SEG_G,

/*      +-----+
 *      |     #
 *      |     #
 *      |     #
 *      +-----+
 *      |     #
 *      |     #
 *      |     #
 *      +-----+
 */
        SEG_A|SEG_D|SEG_E|SEG_F|SEG_G,

/*      +#####+
 *      |     #
 *      |     #
 *      |     #
 *      +#####+
 *      #     |
 *      #     |
 *      #     |
 *      +#####+
 */
        SEG_C|SEG_F,

/*      +#####+
 *      |     #
 *      |     #
 *      |     #
 *      +#####+
 *      |     #
 *      |     #
 *      |     #
 *      +#####+
 */
        SEG_E|SEG_F,

/*      +-----+
 *      #     #
 *      #     #
 *      #     #
 *      +#####+
 *      |     #
 *      |     #
 *      |     #
 *      +-----+
 */
        SEG_A|SEG_D|SEG_E,

/*      +#####+
 *      #     |
 *      #     |
 *      #     |
 *      +#####+
 *      |     #
 *      |     #
 *      |     #
 *      +#####+
 */
        SEG_B|SEG_E,

/*      +#####+
 *      #     |
 *      #     |
 *      #     |
 *      +#####+
 *      #     #
 *      #     #
 *      #     #
 *      +#####+
 */
        SEG_B,

/*      +#####+
 *      |     #
 *      |     #
 *      |     #
 *      +-----+
 *      |     #
 *      |     #
 *      |     #
 *      +-----+
 */
        SEG_D|SEG_E|SEG_F,

/*      +#####+
 *      #     #
 *      #     #
 *      #     #
 *      +#####+
 *      #     #
 *      #     #
 *      #     #
 *      +#####+
 */
        0,

/*      +#####+
 *      #     #
 *      #     #
 *      #     #
 *      +#####+
 *      |     #
 *      |     #
 *      |     #
 *      +-----+
 */
        SEG_D|SEG_E,
};

static uint8_t
brh_7seg_xlate(char c)
{
        uint8_t rv;

        if (c >= '0' && c <= '9')
                rv = digitmap[c - '0'];
        else if (c == '.')
                rv = (uint8_t) ~SEG_DP;
        else
                rv = 0xff;

        return (rv);
}

void
brh_7seg(char a)
{
        uint8_t ch;

        ch = brh_7seg_xlate(a);

        snakestate = 0;

        WRITE(BRH_LED_VBASE, ch);
}

static const uint8_t snakemap[] = {

/*      +#####+
 *      |     |
 *      |     |
 *      |     |
 *      +-----+
 *      |     |
 *      |     |
 *      |     |
 *      +-----+
 */
        ~SEG_A,

/*      +-----+
 *      #     |
 *      #     |
 *      #     |
 *      +-----+
 *      |     |
 *      |     |
 *      |     |
 *      +-----+
 */
        ~SEG_F,

/*      +-----+
 *      |     |
 *      |     |
 *      |     |
 *      +#####+
 *      |     |
 *      |     |
 *      |     |
 *      +-----+
 */
        ~SEG_G,

/*      +-----+
 *      |     |
 *      |     |
 *      |     |
 *      +-----+
 *      |     #
 *      |     #
 *      |     #
 *      +-----+
 */
        ~SEG_C,

/*      +-----+
 *      |     |
 *      |     |
 *      |     |
 *      +-----+
 *      |     |
 *      |     |
 *      |     |
 *      +#####+
 */
        ~SEG_D,

/*      +-----+
 *      |     |
 *      |     |
 *      |     |
 *      +-----+
 *      #     |
 *      #     |
 *      #     |
 *      +-----+
 */
        ~SEG_E,

/*      +-----+
 *      |     |
 *      |     |
 *      |     |
 *      +#####+
 *      |     |
 *      |     |
 *      |     |
 *      +-----+
 */
        ~SEG_G,

/*      +-----+
 *      |     #
 *      |     #
 *      |     #
 *      +-----+
 *      |     |
 *      |     |
 *      |     |
 *      +-----+
 */
        ~SEG_B,
};

void
brh_7seg_snake(void)
{
        int cur = snakestate;

        WRITE(BRH_LED_VBASE, snakemap[cur]);

        snakestate = (cur + 1) & 7;
}