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 <asm/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 24static unsigned int led_state; 25static unsigned int hw_led_state; 26 27#define LED_23 GPIO_GPIO23 28#define LED_MASK (LED_23) 29 30void 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} 102