arch/arm/mach-ebsa110/leds.c

   1 /*
   2  *  linux/arch/arm/mach-ebsa110/leds.c
   3  *
   4  *  Copyright (C) 1998 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  *  EBSA-110 LED control routines.  We use the led as follows:
  11  *
  12  *   - Red - toggles state every 50 timer interrupts
  13  */
  14 #include <linux/module.h>
  15 #include <linux/spinlock.h>
  16 #include <linux/init.h>
  17
  18 #include <mach/hardware.h>
  19 #include <asm/leds.h>
  20 #include <asm/system.h>
  21 #include <asm/mach-types.h>
  22
  23 static spinlock_t leds_lock;
  24
  25 static void ebsa110_leds_event(led_event_t ledevt)
  26 {
  27         unsigned long flags;
  28
  29         spin_lock_irqsave(&leds_lock, flags);
  30
  31         switch(ledevt) {
  32         case led_timer:
  33                 *(volatile unsigned char *)SOFT_BASE ^= 128;
  34                 break;
  35
  36         default:
  37                 break;
  38         }
  39
  40         spin_unlock_irqrestore(&leds_lock, flags);
  41 }
  42
  43 static int __init leds_init(void)
  44 {
  45         if (machine_is_ebsa110())
  46                 leds_event = ebsa110_leds_event;
  47
  48         return 0;
  49 }
  50
  51 __initcall(leds_init);