release/src-rt-6.x.4708/linux/linux-2.6.36/arch/mn10300/unit-asb2303/leds.c

   1 /* ASB2303 peripheral 7-segment LEDs x1 support
   2  *
   3  * Copyright (C) 2007 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 Licence
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the Licence, or (at your option) any later version.
  10  */
  11 #include <linux/kernel.h>
  12 #include <linux/param.h>
  13 #include <linux/init.h>
  14
  15 #include <asm/io.h>
  16 #include <asm/processor.h>
  17 #include <asm/intctl-regs.h>
  18 #include <asm/rtc-regs.h>
  19 #include <unit/leds.h>
  20
  21
  22 static const u8 asb2303_led_chase_tbl[6] = {
  23         ~0x02,  /* top          - segA */
  24         ~0x04,  /* right top    - segB */
  25         ~0x08,  /* right bottom - segC */
  26         ~0x10,  /* bottom       - segD */
  27         ~0x20,  /* left bottom  - segE */
  28         ~0x40,  /* left top     - segF */
  29 };
  30
  31 static unsigned asb2303_led_chase;
  32
  33 void peripheral_leds_display_exception(enum exception_code code)
  34 {
  35         ASB2303_GPIO0DEF = 0x5555;      /* configure as an output port */
  36         ASB2303_7SEGLEDS = 0x6d;        /* triple horizontal bar */
  37 }
  38
  39 void peripheral_leds_led_chase(void)
  40 {
  41         ASB2303_GPIO0DEF = 0x5555;      /* configure as an output port */
  42         ASB2303_7SEGLEDS = asb2303_led_chase_tbl[asb2303_led_chase];
  43         asb2303_led_chase++;
  44         if (asb2303_led_chase >= 6)
  45                 asb2303_led_chase = 0;
  46 }