LXR linux/arch/mn10300/unit-asb2364/leds.c

   1/* leds.c: ASB2364 peripheral 7seg LEDs x4 support
   2 *
   3 * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
   4 * Written by David Howells (dhowells@redhat.com)
   5 *
   6 * This program is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU General Public License
   8 * as published by the Free Software Foundation; either version
   9 * 2 of the License, or (at your option) any later version.
  10 */
  11
  12#include <linux/kernel.h>
  13#include <linux/param.h>
  14#include <linux/init.h>
  15
  16#include <asm/io.h>
  17#include <asm/processor.h>
  18#include <asm/intctl-regs.h>
  19#include <asm/rtc-regs.h>
  20#include <unit/leds.h>
  21
  22#if MN10300_USE_7SEGLEDS
  23static const u8 asb2364_led_hex_tbl[16] = {
  24        0x80, 0xf2, 0x48, 0x60, 0x32, 0x24, 0x04, 0xf0,
  25        0x00, 0x20, 0x10, 0x06, 0x8c, 0x42, 0x0c, 0x1c
  26};
  27
  28static const u32 asb2364_led_chase_tbl[6] = {
  29        ~0x02020202,    /* top          - segA */
  30        ~0x04040404,    /* right top    - segB */
  31        ~0x08080808,    /* right bottom - segC */
  32        ~0x10101010,    /* bottom       - segD */
  33        ~0x20202020,    /* left bottom  - segE */
  34        ~0x40404040,    /* left top     - segF */
  35};
  36
  37static unsigned asb2364_led_chase;
  38
  39void peripheral_leds7x4_display_dec(unsigned int val, unsigned int points)
  40{
  41        u32 leds;
  42
  43        leds = asb2364_led_hex_tbl[(val/1000) % 10];
  44        leds <<= 8;
  45        leds |= asb2364_led_hex_tbl[(val/100) % 10];
  46        leds <<= 8;
  47        leds |= asb2364_led_hex_tbl[(val/10) % 10];
  48        leds <<= 8;
  49        leds |= asb2364_led_hex_tbl[val % 10];
  50        leds |= points^0x01010101;
  51
  52        ASB2364_7SEGLEDS = leds;
  53}
  54
  55void peripheral_leds7x4_display_hex(unsigned int val, unsigned int points)
  56{
  57        u32 leds;
  58
  59        leds = asb2364_led_hex_tbl[(val/1000) % 10];
  60        leds <<= 8;
  61        leds |= asb2364_led_hex_tbl[(val/100) % 10];
  62        leds <<= 8;
  63        leds |= asb2364_led_hex_tbl[(val/10) % 10];
  64        leds <<= 8;
  65        leds |= asb2364_led_hex_tbl[val % 10];
  66        leds |= points^0x01010101;
  67
  68        ASB2364_7SEGLEDS = leds;
  69}
  70
  71/* display triple horizontal bar and exception code */
  72void peripheral_leds_display_exception(enum exception_code code)
  73{
  74        u32 leds;
  75
  76        leds = asb2364_led_hex_tbl[(code/0x100) % 0x10];
  77        leds <<= 8;
  78        leds |= asb2364_led_hex_tbl[(code/0x10) % 0x10];
  79        leds <<= 8;
  80        leds |= asb2364_led_hex_tbl[code % 0x10];
  81        leds |= 0x6d010101;
  82
  83        ASB2364_7SEGLEDS = leds;
  84}
  85
  86void peripheral_leds_led_chase(void)
  87{
  88        ASB2364_7SEGLEDS = asb2364_led_chase_tbl[asb2364_led_chase];
  89        asb2364_led_chase++;
  90        if (asb2364_led_chase >= 6)
  91                asb2364_led_chase = 0;
  92}
  93#else  /* MN10300_USE_7SEGLEDS */
  94void peripheral_leds7x4_display_dec(unsigned int val, unsigned int points) { }
  95void peripheral_leds7x4_display_hex(unsigned int val, unsigned int points) { }
  96void peripheral_leds_display_exception(enum exception_code code) { }
  97void peripheral_leds_led_chase(void) { }
  98#endif /* MN10300_USE_7SEGLEDS */
  99