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

/* $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;
}