From 849369d6c66d3054688672f97d31fceb8e8230fb Mon Sep 17 00:00:00 2001 From: root Date: Fri, 25 Dec 2015 04:40:36 +0000 Subject: initial_commit --- arch/arm/mach-sa1100/leds-lart.c | 101 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 101 insertions(+) create mode 100644 arch/arm/mach-sa1100/leds-lart.c (limited to 'arch/arm/mach-sa1100/leds-lart.c') diff --git a/arch/arm/mach-sa1100/leds-lart.c b/arch/arm/mach-sa1100/leds-lart.c new file mode 100644 index 00000000..0505a1fd --- /dev/null +++ b/arch/arm/mach-sa1100/leds-lart.c @@ -0,0 +1,101 @@ +/* + * linux/arch/arm/mach-sa1100/leds-lart.c + * + * (C) Erik Mouw (J.A.K.Mouw@its.tudelft.nl), April 21, 2000 + * + * 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 + +#include +#include +#include + +#include "leds.h" + + +#define LED_STATE_ENABLED 1 +#define LED_STATE_CLAIMED 2 + +static unsigned int led_state; +static unsigned int hw_led_state; + +#define LED_23 GPIO_GPIO23 +#define LED_MASK (LED_23) + +void lart_leds_event(led_event_t evt) +{ + unsigned long flags; + + local_irq_save(flags); + + switch(evt) { + case led_start: + /* pin 23 is output pin */ + GPDR |= LED_23; + 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; + } + + local_irq_restore(flags); +} -- cgit v1.2.3