/*      $NetBSD: iq80321_7seg.c,v 1.7 2011/07/01 20:41:16 dyoung 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 Intel IQ80321.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: iq80321_7seg.c,v 1.7 2011/07/01 20:41:16 dyoung Exp $");

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

#include <sys/bus.h>

#include <evbarm/iq80321/iq80321reg.h>
#include <evbarm/iq80321/iq80321var.h>

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

static int snakestate;

/*
 * The 7-segment display looks like so:
 *
 *         A
 *      +-----+
 *      |     |
 *    F |     | B
 *      |  G  |
 *      +-----+
 *      |     |
 *    E |     | C
 *      |  D  |
 *      +-----+ o  DP
 *
 * Setting a bit clears the corresponding segment on the
 * display.
 */
#define SEG_A                   (1 << 7)
#define SEG_B                   (1 << 6)
#define SEG_C                   (1 << 5)
#define SEG_D                   (1 << 4)
#define SEG_E                   (1 << 3)
#define SEG_F                   (1 << 2)
#define SEG_G                   (1 << 1)
#define SEG_DP                  (1 << 0)

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
iq80321_7seg_xlate(char c)
{
        uint8_t rv;

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

        return (rv);
}

void
iq80321_7seg(char a, char b)
{
        uint8_t msb, lsb;

        msb = iq80321_7seg_xlate(a);
        lsb = iq80321_7seg_xlate(b);

        snakestate = 0;

        WRITE(IQ80321_7SEG_MSB, msb);
        WRITE(IQ80321_7SEG_LSB, lsb);
}

static const uint8_t snakemap[][2] = {

/*      +#####+         +#####+
 *      |     |         |     |
 *      |     |         |     |
 *      |     |         |     |
 *      +-----+         +-----+
 *      |     |         |     |
 *      |     |         |     |
 *      |     |         |     |
 *      +-----+         +-----+
 */
        { ~SEG_A & 0xff, ~SEG_A & 0xff },

/*      +-----+         +-----+
 *      #     |         |     #
 *      #     |         |     #
 *      #     |         |     #
 *      +-----+         +-----+
 *      |     |         |     |
 *      |     |         |     |
 *      |     |         |     |
 *      +-----+         +-----+
 */
        { ~SEG_F,       ~SEG_B },

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

/*      +-----+         +-----+
 *      |     |         |     |
 *      |     |         |     |
 *      |     |         |     |
 *      +-----+         +-----+
 *      |     #         #     |
 *      |     #         #     |
 *      |     #         #     |
 *      +-----+         +-----+
 */
        { ~SEG_C,       ~SEG_E },

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

/*      +-----+         +-----+
 *      |     |         |     |
 *      |     |         |     |
 *      |     |         |     |
 *      +-----+         +-----+
 *      #     |         |     #
 *      #     |         |     #
 *      #     |         |     #
 *      +-----+         +-----+
 */
        { ~SEG_E,       ~SEG_C },

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

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

void
iq80321_7seg_snake(void)
{
        int cur = snakestate;

        WRITE(IQ80321_7SEG_MSB, snakemap[cur][0]);
        WRITE(IQ80321_7SEG_LSB, snakemap[cur][1]);

        snakestate = (cur + 1) & 7;
}