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   1 /*
   2  * linux/arch/arm/mach-sa1100/leds-assabet.c
   3  *
   4  * Copyright (C) 2000 John Dorsey <john+@cs.cmu.edu>
   5  *
   6  * Original (leds-footbridge.c) by Russell King
   7  *
   8  * Assabet uses the LEDs as follows:
   9  *   - Green - toggles state every 50 timer interrupts
  10  *   - Red   - on if system is not idle
  11  */
  12 #include <linux/init.h>
  13
  14 #include <asm/hardware.h>
  15 #include <asm/leds.h>
  16 #include <asm/system.h>
  17 #include <asm/arch/assabet.h>
  18
  19 #include "leds.h"
  20
  21
  22 #define LED_STATE_ENABLED       1
  23 #define LED_STATE_CLAIMED       2
  24
  25 static unsigned int led_state;
  26 static unsigned int hw_led_state;
  27
  28 #define ASSABET_BCR_LED_MASK    (ASSABET_BCR_LED_GREEN | ASSABET_BCR_LED_RED)
  29
  30 void assabet_leds_event(led_event_t evt)
  31 {
  32         unsigned long flags;
  33
  34         local_irq_save(flags);
  35
  36         switch (evt) {
  37         case led_start:
  38                 hw_led_state = ASSABET_BCR_LED_RED | ASSABET_BCR_LED_GREEN;
  39                 led_state = LED_STATE_ENABLED;
  40                 break;
  41
  42         case led_stop:
  43                 led_state &= ~LED_STATE_ENABLED;
  44                 hw_led_state = ASSABET_BCR_LED_RED | ASSABET_BCR_LED_GREEN;
  45                 ASSABET_BCR_frob(ASSABET_BCR_LED_MASK, hw_led_state);
  46                 break;
  47
  48         case led_claim:
  49                 led_state |= LED_STATE_CLAIMED;
  50                 hw_led_state = ASSABET_BCR_LED_RED | ASSABET_BCR_LED_GREEN;
  51                 break;
  52
  53         case led_release:
  54                 led_state &= ~LED_STATE_CLAIMED;
  55                 hw_led_state = ASSABET_BCR_LED_RED | ASSABET_BCR_LED_GREEN;
  56                 break;
  57
  58 #ifdef CONFIG_LEDS_TIMER
  59         case led_timer:
  60                 if (!(led_state & LED_STATE_CLAIMED))
  61                         hw_led_state ^= ASSABET_BCR_LED_GREEN;
  62                 break;
  63 #endif
  64
  65 #ifdef CONFIG_LEDS_CPU
  66         case led_idle_start:
  67                 if (!(led_state & LED_STATE_CLAIMED))
  68                         hw_led_state |= ASSABET_BCR_LED_RED;
  69                 break;
  70
  71         case led_idle_end:
  72                 if (!(led_state & LED_STATE_CLAIMED))
  73                         hw_led_state &= ~ASSABET_BCR_LED_RED;
  74                 break;
  75 #endif
  76
  77         case led_halted:
  78                 break;
  79
  80         case led_green_on:
  81                 if (led_state & LED_STATE_CLAIMED)
  82                         hw_led_state &= ~ASSABET_BCR_LED_GREEN;
  83                 break;
  84
  85         case led_green_off:
  86                 if (led_state & LED_STATE_CLAIMED)
  87                         hw_led_state |= ASSABET_BCR_LED_GREEN;
  88                 break;
  89
  90         case led_amber_on:
  91                 break;
  92
  93         case led_amber_off:
  94                 break;
  95
  96         case led_red_on:
  97                 if (led_state & LED_STATE_CLAIMED)
  98                         hw_led_state &= ~ASSABET_BCR_LED_RED;
  99                 break;
 100
 101         case led_red_off:
 102                 if (led_state & LED_STATE_CLAIMED)
 103                         hw_led_state |= ASSABET_BCR_LED_RED;
 104                 break;
 105
 106         default:
 107                 break;
 108         }
 109
 110         if  (led_state & LED_STATE_ENABLED)
 111                 ASSABET_BCR_frob(ASSABET_BCR_LED_MASK, hw_led_state);
 112
 113         local_irq_restore(flags);
 114 }