scripts: Add support for BeagleLogic standalone board

The board has an on board logic buffer that needs to be enabled
at startup via a GPIO. There is also switchable logic level thresholds
between 1.8V and 3.3V via a GPIO and that control is exposed through
another GPIO. Add support to set both the GPIOs and also gate config-pin
(as it is not required as pinmuxing is handled in the device tree)

Signed-off-by: Kumar Abhishek <abhishek@theembeddedkitchen.net>

scripts/beaglelogic-startup.sh

@@ -2,10 +2,34 @@
 
 log='beaglelogic-startup:'
 SLOTS="/sys/devices/platform/bone_capemgr/slots"
+board=$(cat /proc/device-tree/model | sed "s/ /_/g" | tr -d '\000')
+is_standalone="N"
+
+if [ "x${board}" = "xTI_AM335x_BeagleLogic_Standalone" ] ; then
+	is_standalone="Y"
+
+	# Enable OE of 74LVCH16T245 buffer by writing a '1' to GPIO58
+	if [ ! -d "/sys/class/gpio/gpio58" ] ; then
+		echo 58 > /sys/class/gpio/export
+	fi
+	echo out > /sys/class/gpio/gpio58/direction
+	echo 1 > /sys/class/gpio/gpio58/value
+
+	# Switch logic level voltage threshold to 3.3V by writing a '1' to GPIO57
+	# Writing '0' switches the threshold to 1.8V
+	if [ ! -d "/sys/class/gpio/gpio57" ] ; then
+		echo 57 > /sys/class/gpio/export
+	fi
+	echo out > /sys/class/gpio/gpio57/direction
+	echo 1 > /sys/class/gpio/gpio57/value
+
+	# Ethernet interrupt pacing to improve performance
+	ethtool -C eth0 rx-usecs 500
+fi
 
 check_uboot_overlay=$(grep bone_capemgr.uboot_capemgr_enabled=1 /proc/cmdline || true)
 if [ ! -d /sys/devices/virtual/misc/beaglelogic ] ; then
-	if [ "x${check_uboot_overlay}" = "x" ] ; then
+	if [ "x${check_uboot_overlay}" = "x" ] && [ "x${is_standalone}" = "xN" ] ; then
 		echo beaglelogic > "${SLOTS}"
 		echo cape-universalh > "${SLOTS}"
 	fi
@@ -19,8 +43,10 @@ if [ ! -d /sys/devices/virtual/misc/beaglelogic ] ; then
 	fi
 fi
 
-echo "${log} Configuring LA pins"
-config-pin -f $(dirname $0)/pinconfig
+if [ "x${is_standalone}" = "xN" ] ; then
+	echo "${log} Configuring LA pins"
+	config-pin -f $(dirname $0)/pinconfig
+fi
 
 echo "${log} Allocating 128MiB of logic buffer to BeagleLogic"
 echo 134217728 > /sys/devices/virtual/misc/beaglelogic/memalloc