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/*
* linux/arch/arm/kernel/leds-sa1100.c
*
* Copyright (C) 2000 John Dorsey <john+@cs.cmu.edu>
*
* Original (leds-footbridge.c) by Russell King
*
* Added Brutus LEDs support
* Nicolas Pitre, Mar 19, 2000
*
* Added LART LED support
* Erik Mouw (J.A.K.Mouw@its.tudelft.nl), April 21, 2000
*
*
* Assabet uses the LEDs as follows:
* - Green - toggles state every 50 timer interrupts
* - Red - on if system is not idle
*
* Brutus uses the LEDs as follows:
* - D3 (Green, GPIO9) - toggles state every 50 timer interrupts
* - D17 (Red, GPIO20) - on if system is not idle
* - D4 (Green, GPIO8) - misc function
*
* LART uses the LED as follows:
* - GPIO23 is the LED, on if system is not idle
* You can use both CONFIG_LEDS_CPU and CONFIG_LEDS_TIMER at the same
* time, but in that case the timer events will still dictate the
* pace of the LED.
*
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <asm/hardware.h>
#include <asm/leds.h>
#include <asm/system.h>
#define LED_STATE_ENABLED 1
#define LED_STATE_CLAIMED 2
static unsigned int led_state;
static unsigned int hw_led_state;
#ifdef CONFIG_SA1100_ASSABET
#define BCR_LED_MASK (BCR_LED_GREEN | BCR_LED_RED)
static void assabet_leds_event(led_event_t evt)
{
unsigned long flags;
save_flags_cli(flags);
switch (evt) {
case led_start:
hw_led_state = BCR_LED_RED | BCR_LED_GREEN;
led_state = LED_STATE_ENABLED;
break;
case led_stop:
led_state &= ~LED_STATE_ENABLED;
break;
case led_claim:
led_state |= LED_STATE_CLAIMED;
hw_led_state = BCR_LED_RED | BCR_LED_GREEN;
break;
case led_release:
led_state &= ~LED_STATE_CLAIMED;
hw_led_state = BCR_LED_RED | BCR_LED_GREEN;
break;
#ifdef CONFIG_LEDS_TIMER
case led_timer:
if (!(led_state & LED_STATE_CLAIMED))
hw_led_state ^= BCR_LED_GREEN;
break;
#endif
#ifdef CONFIG_LEDS_CPU
case led_idle_start:
if (!(led_state & LED_STATE_CLAIMED))
hw_led_state |= BCR_LED_RED;
break;
case led_idle_end:
if (!(led_state & LED_STATE_CLAIMED))
hw_led_state &= ~BCR_LED_RED;
break;
#endif
case led_green_on:
if (led_state & LED_STATE_CLAIMED)
hw_led_state &= ~BCR_LED_GREEN;
break;
case led_green_off:
if (led_state & LED_STATE_CLAIMED)
hw_led_state |= BCR_LED_GREEN;
break;
case led_amber_on:
break;
case led_amber_off:
break;
case led_red_on:
if (led_state & LED_STATE_CLAIMED)
hw_led_state &= ~BCR_LED_RED;
break;
case led_red_off:
if (led_state & LED_STATE_CLAIMED)
hw_led_state |= BCR_LED_RED;
break;
default:
break;
}
if (led_state & LED_STATE_ENABLED)
BCR = BCR_value = (BCR_value & ~BCR_LED_MASK) | hw_led_state;
restore_flags(flags);
}
#endif /* CONFIG_SA1100_ASSABET */
#ifdef CONFIG_SA1100_BRUTUS
#define LED_D3 GPIO_GPIO(9)
#define LED_D4 GPIO_GPIO(8)
#define LED_D17 GPIO_GPIO(20)
#define LED_MASK (LED_D3|LED_D4|LED_D17)
static void brutus_leds_event(led_event_t evt)
{
unsigned long flags;
save_flags_cli(flags);
switch (evt) {
case led_start:
hw_led_state = LED_MASK;
led_state = LED_STATE_ENABLED;
break;
case led_stop:
led_state &= ~LED_STATE_ENABLED;
break;
case led_claim:
led_state |= LED_STATE_CLAIMED;
hw_led_state = LED_MASK;
break;
case led_release:
led_state &= ~LED_STATE_CLAIMED;
hw_led_state = LED_MASK;
break;
#ifdef CONFIG_LEDS_TIMER
case led_timer:
if (!(led_state & LED_STATE_CLAIMED))
hw_led_state ^= LED_D3;
break;
#endif
#ifdef CONFIG_LEDS_CPU
case led_idle_start:
if (!(led_state & LED_STATE_CLAIMED))
hw_led_state |= LED_D17;
break;
case led_idle_end:
if (!(led_state & LED_STATE_CLAIMED))
hw_led_state &= ~LED_D17;
break;
#endif
case led_green_on:
hw_led_state &= ~LED_D4;
break;
case led_green_off:
hw_led_state |= LED_D4;
break;
case led_amber_on:
break;
case led_amber_off:
break;
case led_red_on:
if (led_state & LED_STATE_CLAIMED)
hw_led_state &= ~LED_D17;
break;
case led_red_off:
if (led_state & LED_STATE_CLAIMED)
hw_led_state |= LED_D17;
break;
default:
break;
}
if (led_state & LED_STATE_ENABLED) {
GPSR = hw_led_state;
GPCR = hw_led_state ^ LED_MASK;
}
restore_flags(flags);
}
#endif /* CONFIG_SA1100_BRUTUS */
#ifdef CONFIG_SA1100_LART
#define LED_23 GPIO_GPIO23
#define LED_MASK (LED_23)
static void lart_leds_event(led_event_t evt)
{
unsigned long flags;
save_flags_cli(flags);
switch(evt) {
case led_start:
hw_led_state = LED_MASK;
led_state = LED_STATE_ENABLED;
break;
case led_stop:
led_state &= ~LED_STATE_ENABLED;
break;
case led_claim:
led_state |= LED_STATE_CLAIMED;
hw_led_state = LED_MASK;
break;
case led_release:
led_state &= ~LED_STATE_CLAIMED;
hw_led_state = LED_MASK;
break;
#ifdef CONFIG_LEDS_TIMER
case led_timer:
if (!(led_state & LED_STATE_CLAIMED))
hw_led_state ^= LED_23;
break;
#endif
#ifdef CONFIG_LEDS_CPU
case led_idle_start:
/* The LART people like the LED to be off when the
system is idle... */
if (!(led_state & LED_STATE_CLAIMED))
hw_led_state &= ~LED_23;
break;
case led_idle_end:
/* ... and on if the system is not idle */
if (!(led_state & LED_STATE_CLAIMED))
hw_led_state |= LED_23;
break;
#endif
case led_red_on:
if (led_state & LED_STATE_CLAIMED)
hw_led_state &= ~LED_23;
break;
case led_red_off:
if (led_state & LED_STATE_CLAIMED)
hw_led_state |= LED_23;
break;
default:
break;
}
/* Now set the GPIO state, or nothing will happen at all */
if (led_state & LED_STATE_ENABLED) {
GPSR = hw_led_state;
GPCR = hw_led_state ^ LED_MASK;
}
restore_flags(flags);
}
#endif /* CONFIG_SA1100_LART */
static void dummy_leds_event(led_event_t evt)
{
}
void (*leds_event)(led_event_t) = dummy_leds_event;
EXPORT_SYMBOL(leds_event);
static int __init
sa1100_leds_init(void)
{
#ifdef CONFIG_SA1100_ASSABET
if (machine_is_assabet())
leds_event = assabet_leds_event;
#endif
#ifdef CONFIG_SA1100_BRUTUS
if (machine_is_brutus())
leds_event = brutus_leds_event;
#endif
#ifdef CONFIG_SA1100_LART
if (machine_is_lart())
leds_event = lart_leds_event;
#endif
leds_event(led_start);
return 0;
}
__initcall(sa1100_leds_init);
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