1 files changed, 111 insertions, 0 deletions
diff --git a/arch/arm/plat-mxc/leds.c b/arch/arm/plat-mxc/leds.c
new file mode 100644
index 000000000000..09d1ee3f4459
--- /dev/null
+++ b/arch/arm/plat-mxc/leds.c
@@ -0,0 +1,111 @@
+/*
+ * Copyright 2007 Freescale Semiconductor, Inc. All Rights Reserved.
+ */
+
+/*
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+/*
+ * The LED can be used for debugging purpose. To enalbe the LEDs, in the
+ * config file, select:
+ * CONFIG_LEDS
+ * CONFIG_LEDS_TIMER   --- enable the OS tick LED once every 50 ticks (.5sec)
+ * CONFIG_LEDS_CPU     --- enable the cpu idle in/out LED (blink fast)
+ *
+ * The two LEDs can be disabled through user space by issuing:
+ *      echo "claim" > /sys/devices/system/leds/leds0/event
+ * To release the LEDs back to the normal operation, do:
+ *      echo "release" > /sys/devices/system/leds/leds0/event
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/ioport.h>
+#include <asm/mach-types.h>
+#include <asm/hardware.h>
+#include <asm/leds.h>
+
+#define LED_STATE_ENABLED	(1 << 0)
+#define LED_STATE_CLAIMED	(1 << 1)
+
+static unsigned int led_state;
+static unsigned int hw_led_state;
+
+static void mxc_leds_event(led_event_t evt)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+
+	switch (evt) {
+	case led_start:
+		hw_led_state = MXC_BD_LED1 | MXC_BD_LED2;
+		led_state = LED_STATE_ENABLED;
+		break;
+
+	case led_stop:
+	case led_halted:
+		hw_led_state = 0;
+		led_state &= ~LED_STATE_ENABLED;
+		MXC_BD_LED_OFF(MXC_BD_LED1 | MXC_BD_LED2);
+		break;
+
+	case led_claim:
+		led_state |= LED_STATE_CLAIMED;
+		hw_led_state = 0;
+		break;
+
+	case led_release:
+		led_state &= ~LED_STATE_CLAIMED;
+		hw_led_state = 0;
+		break;
+
+#ifdef CONFIG_LEDS_TIMER
+	case led_timer:
+		if (!(led_state & LED_STATE_CLAIMED))
+			hw_led_state ^= MXC_BD_LED1;
+		break;
+#endif
+
+#ifdef CONFIG_LEDS_CPU
+	case led_idle_start:
+		if (!(led_state & LED_STATE_CLAIMED))
+			hw_led_state &= ~MXC_BD_LED2;
+		break;
+
+	case led_idle_end:
+		if (!(led_state & LED_STATE_CLAIMED))
+			hw_led_state |= MXC_BD_LED2;
+		break;
+#endif
+
+	default:
+		break;
+	}
+
+	if (led_state & LED_STATE_ENABLED) {
+		MXC_BD_LED_OFF(~hw_led_state);
+		MXC_BD_LED_ON(hw_led_state);
+	}
+
+	local_irq_restore(flags);
+}
+
+static int __init mxc_leds_init(void)
+{
+	led_state = LED_STATE_ENABLED;
+	leds_event = mxc_leds_event;
+	return 0;
+}
+
+core_initcall(mxc_leds_init);