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leds.c

/* ASB2305 Peripheral 7-segment LEDs x4 support
 *
 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public Licence
 * as published by the Free Software Foundation; either version
 * 2 of the Licence, 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/cpu/intctl-regs.h>
#include <asm/cpu/rtc-regs.h>
#include <asm/unit/leds.h>

static const u8 asb2305_led_hex_tbl[16] = {
      0x80, 0xf2, 0x48, 0x60, 0x32, 0x24, 0x04, 0xf0,
      0x00, 0x20, 0x10, 0x06, 0x8c, 0x42, 0x0c, 0x1c
};

static const u32 asb2305_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 asb2305_led_chase;

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

      leds = asb2305_led_hex_tbl[(val/1000) % 10];
      leds <<= 8;
      leds |= asb2305_led_hex_tbl[(val/100) % 10];
      leds <<= 8;
      leds |= asb2305_led_hex_tbl[(val/10) % 10];
      leds <<= 8;
      leds |= asb2305_led_hex_tbl[val % 10];
      leds |= points^0x01010101;

      ASB2305_7SEGLEDS = leds;
}

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

      leds = asb2305_led_hex_tbl[(val/1000) % 10];
      leds <<= 8;
      leds |= asb2305_led_hex_tbl[(val/100) % 10];
      leds <<= 8;
      leds |= asb2305_led_hex_tbl[(val/10) % 10];
      leds <<= 8;
      leds |= asb2305_led_hex_tbl[val % 10];
      leds |= points^0x01010101;

      ASB2305_7SEGLEDS = leds;
}

void peripheral_leds_display_exception(enum exception_code code)
{
      u32 leds;

      leds = asb2305_led_hex_tbl[(code/0x100) % 0x10];
      leds <<= 8;
      leds |= asb2305_led_hex_tbl[(code/0x10) % 0x10];
      leds <<= 8;
      leds |= asb2305_led_hex_tbl[code % 0x10];
      leds |= 0x6d010101;

      ASB2305_7SEGLEDS = leds;
}

void peripheral_leds7x4_display_minssecs(unsigned int time, unsigned int points)
{
      u32 leds;

      leds = asb2305_led_hex_tbl[(time/600) % 6];
      leds <<= 8;
      leds |= asb2305_led_hex_tbl[(time/60) % 10];
      leds <<= 8;
      leds |= asb2305_led_hex_tbl[(time/10) % 6];
      leds <<= 8;
      leds |= asb2305_led_hex_tbl[time % 10];
      leds |= points^0x01010101;

      ASB2305_7SEGLEDS = leds;
}

void peripheral_leds7x4_display_rtc(void)
{
      unsigned int clock;
      u8 mins, secs;

      mins = RTMCR;
      secs = RTSCR;

      clock = ((mins & 0xf0) >> 4);
      clock *= 10;
      clock += (mins & 0x0f);
      clock *= 6;

      clock += ((secs & 0xf0) >> 4);
      clock *= 10;
      clock += (secs & 0x0f);

      peripheral_leds7x4_display_minssecs(clock, 0);
}

void peripheral_leds_led_chase(void)
{
      ASB2305_7SEGLEDS = asb2305_led_chase_tbl[asb2305_led_chase];
      asb2305_led_chase++;
      if (asb2305_led_chase >= 6)
            asb2305_led_chase = 0;
}

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