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