bfcpu-freq

#!/bin/sh

# Copyright (c) 2017, Mellanox Technologies
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice, this
#    list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright notice,
#    this list of conditions and the following disclaimer in the documentation
#    and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
# ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# The views and conclusions contained in the software and documentation are those
# of the authors and should not be interpreted as representing official policies,
# either expressed or implied, of the FreeBSD Project.

#
# Read the core PLL register to calculate the core clock frequency
#

BF1_PLATFORM_ID=0x00000211
BF2_PLATFORM_ID=0x00000214

bfversion=$(bfhcafw mcra 0xf0014.0:16)

padfreq=156.25 # MHz

if [ "$bfversion" = $BF1_PLATFORM_ID ]; then

	F=$(($(bfhcafw mcra 0x1c0384.3:13)))
	R=$(($(bfhcafw mcra 0x1c0384.20:6)))
	OD=$(($(bfhcafw mcra 0x1c0384.16:4)))

	# F= padfreq*(F+1)/((R+1)*(OD+1))
	freq=$(echo "$F 1 + $padfreq * $R 1 + / $OD 1 + / p"  | dc)

	echo "core freq = ${freq}MHz"

elif [ "$bfversion" = $BF2_PLATFORM_ID ]; then

	F=$(($(bfhcafw mcra 0xf0f90.0:26)))
	R=$(($(bfhcafw mcra 0xf0f90.26:6)))
	OD=$(($(bfhcafw mcra 0xf0f94.0:4)))

	# F= padfreq*(F/16384)/(R+1)/(OD+1)
	freq=$(echo "$F $padfreq * 16384 / $R 1 + / $OD 1 + / p"  | dc)

	echo "core freq = ${freq}MHz"
else
	echo "Unknown platform, unable to get the cpu frequency"
fi