Initial commit

meta-ingrasys/meta-zaius/recipes-phosphor/chassis/avsbus-control/zaius_avsbus.sh

@@ -0,0 +1,58 @@
+#!/bin/sh -e
+# AVSBus control for PMBUS voltage regulator modules (VRMs)
+# Switches output voltage target between
+# - VOUT_COMMAND register (AVSBus disabled, default on Zaius)
+# - AVSBus target output (AVSBus enabled, voltage set by host)
+
+cpu0_i2c_bus="7"
+cpu1_i2c_bus="8"
+buses="$cpu0_i2c_bus $cpu1_i2c_bus"
+vdd_i2c_addr_page="0x60:0x01"
+vdn_i2c_addr_page="0x64:0x01"
+vcs_i2c_addr_page="0x64:0x00"
+addrs_pages="$vdd_i2c_addr_page $vdn_i2c_addr_page $vcs_i2c_addr_page"
+
+i2c_path="/sys/bus/i2c/devices/"
+
+# Usage: vrm_avs_enable <bus> <i2c_address> <page>
+# Initializes the AVSBus VOUT setpoint to the value in PMBus VOUT_COMMAND
+vrm_avs_enable()
+{
+    echo "Enabling AVSBus on bus $1 VRM @$2 rail $3..."
+    echo 1 > "${i2c_path}/$1-$(printf "%04x" "$2")/hwmon/hwmon*/avs$(printf "%d" "$3")_enable"
+}
+
+# Usage: vrm_avs_disable <bus> <i2c_address> <page>
+# Sets OPERATION PMBUS register to
+# - Enable/Disable: On
+# - VOUT Source: VOUT_COMMAND
+# - AVSBus Copy: VOUT_COMMAND remains unchanged
+vrm_avs_disable()
+{
+    echo "Disabling AVSBus on bus $1 VRM @$2 rail $3..."
+    echo 0 > "${i2c_path}/$1-$(printf "%04x" "$2")/hwmon/hwmon*/avs$(printf "%d" "$3")_enable"
+}
+
+# Usage: for_each_rail <command>
+# <command> will be invoked with <bus> <i2c_address> <page>
+for_each_rail()
+{
+    for bus in $buses
+    do
+        for addr_page in $addrs_pages
+        do
+            $1 "$bus" "$(echo "$addr_page" | tr : " ")"
+        done
+    done
+}
+
+if [ "$1" = "enable" ]
+then
+    for_each_rail vrm_avs_enable
+elif [ "$1" = "disable" ]
+then
+    for_each_rail vrm_avs_disable
+else
+    echo "\"$0 <enable|disable>\" to control whether VRMs use AVSBus"
+    echo "\"$0 <vdn_max>\" to set VDN rails VOUT_MAX to 1.1V"
+fi