arch/arm/mach-sa1100/leds-lart.c

   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/config.h>
  13 #include <linux/init.h>
  14
  15 #include <asm/hardware.h>
  16 #include <asm/leds.h>
  17 #include <asm/system.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 LED_23    GPIO_GPIO23
  29 #define LED_MASK  (LED_23)
  30
  31 void lart_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                 /* pin 23 is output pin */
  40                 GPDR |= LED_23;
  41                 hw_led_state = LED_MASK;
  42                 led_state = LED_STATE_ENABLED;
  43                 break;
  44
  45         case led_stop:
  46                 led_state &= ~LED_STATE_ENABLED;
  47                 break;
  48
  49         case led_claim:
  50                 led_state |= LED_STATE_CLAIMED;
  51                 hw_led_state = LED_MASK;
  52                 break;
  53
  54         case led_release:
  55                 led_state &= ~LED_STATE_CLAIMED;
  56                 hw_led_state = LED_MASK;
  57                 break;
  58
  59 #ifdef CONFIG_LEDS_TIMER
  60         case led_timer:
  61                 if (!(led_state & LED_STATE_CLAIMED))
  62                         hw_led_state ^= LED_23;
  63                 break;
  64 #endif
  65
  66 #ifdef CONFIG_LEDS_CPU
  67         case led_idle_start:
  68                 /* The LART people like the LED to be off when the
  69                    system is idle... */
  70                 if (!(led_state & LED_STATE_CLAIMED))
  71                         hw_led_state &= ~LED_23;
  72                 break;
  73
  74         case led_idle_end:
  75                 /* ... and on if the system is not idle */
  76                 if (!(led_state & LED_STATE_CLAIMED))
  77                         hw_led_state |= LED_23;
  78                 break;
  79 #endif
  80
  81         case led_red_on:
  82                 if (led_state & LED_STATE_CLAIMED)
  83                         hw_led_state &= ~LED_23;
  84                 break;
  85
  86         case led_red_off:
  87                 if (led_state & LED_STATE_CLAIMED)
  88                         hw_led_state |= LED_23;
  89                 break;
  90
  91         default:
  92                 break;
  93         }
  94
  95         /* Now set the GPIO state, or nothing will happen at all */
  96         if (led_state & LED_STATE_ENABLED) {
  97                 GPSR = hw_led_state;
  98                 GPCR = hw_led_state ^ LED_MASK;
  99         }
 100
 101         local_irq_restore(flags);
 102 }