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   1 /*
   2  * linux/arch/arm/mach-sa1100/leds-lart.c
   3  *
   4  * (C) Erik Mouw (J.A.K.Mouw@its.tudelft.nl), April 21, 2000
   5  *
   6  * LART uses the LED as follows:
   7  *   - GPIO23 is the LED, on if system is not idle
   8  *  You can use both CONFIG_LEDS_CPU and CONFIG_LEDS_TIMER at the same
   9  *  time, but in that case the timer events will still dictate the
  10  *  pace of the LED.
  11  */
  12 #include <linux/init.h>
  13
  14 #include <mach/hardware.h>
  15 #include <asm/leds.h>
  16 #include <asm/system.h>
  17
  18 #include "leds.h"
  19
  20
  21 #define LED_STATE_ENABLED       1
  22 #define LED_STATE_CLAIMED       2
  23
  24 static unsigned int led_state;
  25 static unsigned int hw_led_state;
  26
  27 #define LED_23    GPIO_GPIO23
  28 #define LED_MASK  (LED_23)
  29
  30 void lart_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                 /* pin 23 is output pin */
  39                 GPDR |= LED_23;
  40                 hw_led_state = LED_MASK;
  41                 led_state = LED_STATE_ENABLED;
  42                 break;
  43
  44         case led_stop:
  45                 led_state &= ~LED_STATE_ENABLED;
  46                 break;
  47
  48         case led_claim:
  49                 led_state |= LED_STATE_CLAIMED;
  50                 hw_led_state = LED_MASK;
  51                 break;
  52
  53         case led_release:
  54                 led_state &= ~LED_STATE_CLAIMED;
  55                 hw_led_state = LED_MASK;
  56                 break;
  57
  58 #ifdef CONFIG_LEDS_TIMER
  59         case led_timer:
  60                 if (!(led_state & LED_STATE_CLAIMED))
  61                         hw_led_state ^= LED_23;
  62                 break;
  63 #endif
  64
  65 #ifdef CONFIG_LEDS_CPU
  66         case led_idle_start:
  67                 /* The LART people like the LED to be off when the
  68                    system is idle... */
  69                 if (!(led_state & LED_STATE_CLAIMED))
  70                         hw_led_state &= ~LED_23;
  71                 break;
  72
  73         case led_idle_end:
  74                 /* ... and on if the system is not idle */
  75                 if (!(led_state & LED_STATE_CLAIMED))
  76                         hw_led_state |= LED_23;
  77                 break;
  78 #endif
  79
  80         case led_red_on:
  81                 if (led_state & LED_STATE_CLAIMED)
  82                         hw_led_state &= ~LED_23;
  83                 break;
  84
  85         case led_red_off:
  86                 if (led_state & LED_STATE_CLAIMED)
  87                         hw_led_state |= LED_23;
  88                 break;
  89
  90         default:
  91                 break;
  92         }
  93
  94         /* Now set the GPIO state, or nothing will happen at all */
  95         if (led_state & LED_STATE_ENABLED) {
  96                 GPSR = hw_led_state;
  97                 GPCR = hw_led_state ^ LED_MASK;
  98         }
  99
 100         local_irq_restore(flags);
 101 }