beaglebone: Add code to set the value of the LEDs

The LEDs on the beaglebone are connected to GPIOs called USR0-USR3. This
change adds some functions to make it easy to set their value and clear
what the calling code is trying to do.

Change-Id: I0bb83bbc2e195ce1a0104afcd120089efaa22916
Signed-off-by: Gabe Black <gabeblack@chromium.org>
Reviewed-on: https://review.coreboot.org/3943
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

src/mainboard/ti/beaglebone/Makefile.inc

@@ -14,6 +14,7 @@
 ##
 
 bootblock-y += bootblock.c
+bootblock-y += leds.c
 romstage-y += romstage.c
 
 #ramstage-y += ramstage.c

src/mainboard/ti/beaglebone/leds.c

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <assert.h>
+#include <console/console.h>
+#include <cpu/ti/am335x/gpio.h>
+#include <stdlib.h>
+
+#include "leds.h"
+
+static const int led_gpios[BEAGLEBONE_LED_COUNT] = {
+	[BEAGLEBONE_LED_USR0] = AM335X_GPIO_BITS_PER_BANK + 21,
+	[BEAGLEBONE_LED_USR1] = AM335X_GPIO_BITS_PER_BANK + 22,
+	[BEAGLEBONE_LED_USR2] = AM335X_GPIO_BITS_PER_BANK + 23,
+	[BEAGLEBONE_LED_USR3] = AM335X_GPIO_BITS_PER_BANK + 24
+};
+
+void beaglebone_leds_init(void)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(led_gpios); i++)
+		gpio_direction_output(led_gpios[i], 0);
+}
+
+void beaglebone_leds_set(enum beaglebone_led led, int on)
+{
+	int res;
+
+	ASSERT(led < ARRAY_SIZE(led_gpios) && led_gpios[led]);
+	res = gpio_set_value(led_gpios[led], on);
+	ASSERT(res != -1);
+}

src/mainboard/ti/beaglebone/leds.h

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __MAINBOARD_TI_BEAGLEBONE_LEDS_H__
+#define __MAINBOARD_TI_BEAGLEBONE_LEDS_H__
+
+enum beaglebone_led {
+	BEAGLEBONE_LED_USR0,
+	BEAGLEBONE_LED_USR1,
+	BEAGLEBONE_LED_USR2,
+	BEAGLEBONE_LED_USR3,
+	BEAGLEBONE_LED_COUNT
+};
+
+void beaglebone_leds_init(void);
+void beaglebone_leds_set(enum beaglebone_led led, int on);
+
+#endif	/* __MAINBOARD_TI_BEAGLEBONE_LEDS_H__ */