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/init.h>
  13
  14 #include <mach/hardware.h>
  15 #include <asm/leds.h>
  16
  17 #include "leds.h"
  18
  19
  20 #define LED_STATE_ENABLED       1
  21 #define LED_STATE_CLAIMED       2
  22
  23 static unsigned int led_state;
  24 static unsigned int hw_led_state;
  25
  26 #define LED_23    GPIO_GPIO23
  27 #define LED_MASK  (LED_23)
  28
  29 void lart_leds_event(led_event_t evt)
  30 {
  31         unsigned long flags;
  32
  33         local_irq_save(flags);
  34
  35         switch(evt) {
  36         case led_start:
  37                 /* pin 23 is output pin */
  38                 GPDR |= LED_23;
  39                 hw_led_state = LED_MASK;
  40                 led_state = LED_STATE_ENABLED;
  41                 break;
  42
  43         case led_stop:
  44                 led_state &= ~LED_STATE_ENABLED;
  45                 break;
  46
  47         case led_claim:
  48                 led_state |= LED_STATE_CLAIMED;
  49                 hw_led_state = LED_MASK;
  50                 break;
  51
  52         case led_release:
  53                 led_state &= ~LED_STATE_CLAIMED;
  54                 hw_led_state = LED_MASK;
  55                 break;
  56
  57 #ifdef CONFIG_LEDS_TIMER
  58         case led_timer:
  59                 if (!(led_state & LED_STATE_CLAIMED))
  60                         hw_led_state ^= LED_23;
  61                 break;
  62 #endif
  63
  64 #ifdef CONFIG_LEDS_CPU
  65         case led_idle_start:
  66                 /* The LART people like the LED to be off when the
  67                    system is idle... */
  68                 if (!(led_state & LED_STATE_CLAIMED))
  69                         hw_led_state &= ~LED_23;
  70                 break;
  71
  72         case led_idle_end:
  73                 /* ... and on if the system is not idle */
  74                 if (!(led_state & LED_STATE_CLAIMED))
  75                         hw_led_state |= LED_23;
  76                 break;
  77 #endif
  78
  79         case led_red_on:
  80                 if (led_state & LED_STATE_CLAIMED)
  81                         hw_led_state &= ~LED_23;
  82                 break;
  83
  84         case led_red_off:
  85                 if (led_state & LED_STATE_CLAIMED)
  86                         hw_led_state |= LED_23;
  87                 break;
  88
  89         default:
  90                 break;
  91         }
  92
  93         /* Now set the GPIO state, or nothing will happen at all */
  94         if (led_state & LED_STATE_ENABLED) {
  95                 GPSR = hw_led_state;
  96                 GPCR = hw_led_state ^ LED_MASK;
  97         }
  98
  99         local_irq_restore(flags);
 100 }