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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/config.h>
  13 #include <linux/init.h>
  14
  15 #include <asm/hardware.h>
  16 #include <asm/leds.h>
  17 #include <asm/system.h>
  18 #include <asm/arch/assabet.h>
  19
  20 #include "leds.h"
  21
  22
  23 #define LED_STATE_ENABLED       1
  24 #define LED_STATE_CLAIMED       2
  25
  26 static unsigned int led_state;
  27 static unsigned int hw_led_state;
  28
  29 #define ASSABET_BCR_LED_MASK    (ASSABET_BCR_LED_GREEN | ASSABET_BCR_LED_RED)
  30
  31 void assabet_leds_event(led_event_t evt)
  32 {
  33         unsigned long flags;
  34
  35         local_irq_save(flags);
  36
  37         switch (evt) {
  38         case led_start:
  39                 hw_led_state = ASSABET_BCR_LED_RED | ASSABET_BCR_LED_GREEN;
  40                 led_state = LED_STATE_ENABLED;
  41                 break;
  42
  43         case led_stop:
  44                 led_state &= ~LED_STATE_ENABLED;
  45                 hw_led_state = ASSABET_BCR_LED_RED | ASSABET_BCR_LED_GREEN;
  46                 ASSABET_BCR_frob(ASSABET_BCR_LED_MASK, hw_led_state);
  47                 break;
  48
  49         case led_claim:
  50                 led_state |= LED_STATE_CLAIMED;
  51                 hw_led_state = ASSABET_BCR_LED_RED | ASSABET_BCR_LED_GREEN;
  52                 break;
  53
  54         case led_release:
  55                 led_state &= ~LED_STATE_CLAIMED;
  56                 hw_led_state = ASSABET_BCR_LED_RED | ASSABET_BCR_LED_GREEN;
  57                 break;
  58
  59 #ifdef CONFIG_LEDS_TIMER
  60         case led_timer:
  61                 if (!(led_state & LED_STATE_CLAIMED))
  62                         hw_led_state ^= ASSABET_BCR_LED_GREEN;
  63                 break;
  64 #endif
  65
  66 #ifdef CONFIG_LEDS_CPU
  67         case led_idle_start:
  68                 if (!(led_state & LED_STATE_CLAIMED))
  69                         hw_led_state |= ASSABET_BCR_LED_RED;
  70                 break;
  71
  72         case led_idle_end:
  73                 if (!(led_state & LED_STATE_CLAIMED))
  74                         hw_led_state &= ~ASSABET_BCR_LED_RED;
  75                 break;
  76 #endif
  77
  78         case led_halted:
  79                 break;
  80
  81         case led_green_on:
  82                 if (led_state & LED_STATE_CLAIMED)
  83                         hw_led_state &= ~ASSABET_BCR_LED_GREEN;
  84                 break;
  85
  86         case led_green_off:
  87                 if (led_state & LED_STATE_CLAIMED)
  88                         hw_led_state |= ASSABET_BCR_LED_GREEN;
  89                 break;
  90
  91         case led_amber_on:
  92                 break;
  93
  94         case led_amber_off:
  95                 break;
  96
  97         case led_red_on:
  98                 if (led_state & LED_STATE_CLAIMED)
  99                         hw_led_state &= ~ASSABET_BCR_LED_RED;
 100                 break;
 101
 102         case led_red_off:
 103                 if (led_state & LED_STATE_CLAIMED)
 104                         hw_led_state |= ASSABET_BCR_LED_RED;
 105                 break;
 106
 107         default:
 108                 break;
 109         }
 110
 111         if  (led_state & LED_STATE_ENABLED)
 112                 ASSABET_BCR_frob(ASSABET_BCR_LED_MASK, hw_led_state);
 113
 114         local_irq_restore(flags);
 115 }