leds.c

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/* leds.c: ASB2364 peripheral 7seg LEDs x4 support
 *
 * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells ([email protected])
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <linux/kernel.h>
#include <linux/param.h>
#include <linux/init.h>

#include <asm/io.h>
#include <asm/processor.h>
#include <asm/intctl-regs.h>
#include <asm/rtc-regs.h>
#include <unit/leds.h>

#if MN10300_USE_7SEGLEDS
static const u8 asb2364_led_hex_tbl[16] = {
    0x80, 0xf2, 0x48, 0x60, 0x32, 0x24, 0x04, 0xf0,
    0x00, 0x20, 0x10, 0x06, 0x8c, 0x42, 0x0c, 0x1c
};

static const u32 asb2364_led_chase_tbl[6] = {
    ~0x02020202,    /* top      - segA */
    ~0x04040404,    /* right top    - segB */
    ~0x08080808,    /* right bottom - segC */
    ~0x10101010,    /* bottom   - segD */
    ~0x20202020,    /* left bottom  - segE */
    ~0x40404040,    /* left top - segF */
};

static unsigned asb2364_led_chase;

void peripheral_leds7x4_display_dec(unsigned int val, unsigned int points)
{
    u32 leds;

    leds = asb2364_led_hex_tbl[(val/1000) % 10];
    leds <<= 8;
    leds |= asb2364_led_hex_tbl[(val/100) % 10];
    leds <<= 8;
    leds |= asb2364_led_hex_tbl[(val/10) % 10];
    leds <<= 8;
    leds |= asb2364_led_hex_tbl[val % 10];
    leds |= points^0x01010101;

    ASB2364_7SEGLEDS = leds;
}

void peripheral_leds7x4_display_hex(unsigned int val, unsigned int points)
{
    u32 leds;

    leds = asb2364_led_hex_tbl[(val/1000) % 10];
    leds <<= 8;
    leds |= asb2364_led_hex_tbl[(val/100) % 10];
    leds <<= 8;
    leds |= asb2364_led_hex_tbl[(val/10) % 10];
    leds <<= 8;
    leds |= asb2364_led_hex_tbl[val % 10];
    leds |= points^0x01010101;

    ASB2364_7SEGLEDS = leds;
}

/* display triple horizontal bar and exception code */
void peripheral_leds_display_exception(enum exception_code code)
{
    u32 leds;

    leds = asb2364_led_hex_tbl[(code/0x100) % 0x10];
    leds <<= 8;
    leds |= asb2364_led_hex_tbl[(code/0x10) % 0x10];
    leds <<= 8;
    leds |= asb2364_led_hex_tbl[code % 0x10];
    leds |= 0x6d010101;

    ASB2364_7SEGLEDS = leds;
}

void peripheral_leds_led_chase(void)
{
    ASB2364_7SEGLEDS = asb2364_led_chase_tbl[asb2364_led_chase];
    asb2364_led_chase++;
    if (asb2364_led_chase >= 6)
        asb2364_led_chase = 0;
}
#else  /* MN10300_USE_7SEGLEDS */
void peripheral_leds7x4_display_dec(unsigned int val, unsigned int points) { }
void peripheral_leds7x4_display_hex(unsigned int val, unsigned int points) { }
void peripheral_leds_display_exception(enum exception_code code) { }
void peripheral_leds_led_chase(void) { }
#endif /* MN10300_USE_7SEGLEDS */