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
  23 static 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
  28 static 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
  37 static unsigned asb2364_led_chase;
  38
  39 void 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
  55 void 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 */
  72 void 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
  86 void 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 */
  94 void peripheral_leds7x4_display_dec(unsigned int val, unsigned int points) { }
  95 void peripheral_leds7x4_display_hex(unsigned int val, unsigned int points) { }
  96 void peripheral_leds_display_exception(enum exception_code code) { }
  97 void peripheral_leds_led_chase(void) { }
  98 #endif /* MN10300_USE_7SEGLEDS */