Witherspoon VRM overrides
Overrides the default voltages of Witherspoon
VRMs before a power on.
Change-Id: Ide881b4b0656f53782459a427f8acde729137822
Signed-off-by: Matt Spinler <spinler@us.ibm.com>
diff --git a/meta-witherspoon/recipes-phosphor/chassis/vrm-control.bb b/meta-witherspoon/recipes-phosphor/chassis/vrm-control.bb
new file mode 100644
index 0000000..7802403
--- /dev/null
+++ b/meta-witherspoon/recipes-phosphor/chassis/vrm-control.bb
@@ -0,0 +1,24 @@
+SUMMARY = "Witherspoon VRM Overrides"
+DESCRIPTION = "Sets Witherspoon VRMs to custom voltages"
+PR = "r1"
+
+inherit obmc-phosphor-systemd
+inherit obmc-phosphor-license
+
+RDEPENDS_${PN} += "i2c-tools bash"
+
+S = "${WORKDIR}"
+SRC_URI += "file://vrm-control.sh"
+
+do_install() {
+ install -d ${D}${bindir}
+ install -m 0755 ${WORKDIR}/vrm-control.sh ${D}${bindir}/vrm-control.sh
+}
+
+TMPL = "vrm-control@.service"
+INSTFMT = "vrm-control@{0}.service"
+TGTFMT = "obmc-chassis-start@{0}.target"
+FMT = "../${TMPL}:${TGTFMT}.wants/${INSTFMT}"
+
+SYSTEMD_SERVICE_${PN} += "${TMPL}"
+SYSTEMD_LINK_${PN} += "${@compose_list(d, 'FMT', 'OBMC_CHASSIS_INSTANCES')}"
diff --git a/meta-witherspoon/recipes-phosphor/chassis/vrm-control/vrm-control.sh b/meta-witherspoon/recipes-phosphor/chassis/vrm-control/vrm-control.sh
new file mode 100644
index 0000000..8035d2e
--- /dev/null
+++ b/meta-witherspoon/recipes-phosphor/chassis/vrm-control/vrm-control.sh
@@ -0,0 +1,155 @@
+#!/bin/bash
+# #########################################################
+# Script to run on witherspoon BMC to read/set vrm voltages
+
+
+# #########################################################
+d2v () {
+# usage: d2v <decimal volts>
+
+echo $1 | awk '{print $1 * 256 + .5}' | cut -d '.' -f 1
+}
+
+
+# #########################################################
+v2d () {
+# usage: v2d <hex val>
+
+printf " %0.3fV" `echo $1 | awk '{print $1 / 256}'`
+}
+
+
+# #########################################################
+i2d () {
+# usage: i2d <hex val> <current divisor>
+
+# parse current mantisa and exponent
+# format: SEEE ESMM MMMM MMMM
+let e=$1/0x800
+let esign=e/0x10
+let m=$1\&0x07FF
+let msign=m/0x0400
+
+if [ $msign -eq 1 ]
+then
+ # calc ones compliment
+ let m=($m^0x07FF)+1
+ m="-$m"
+fi
+if [ $esign -eq 1 ]
+then
+ # calc ones compliment
+ let e=(e^0x1F)+1
+ e="-$e"
+fi
+printf " %0.3fA\n" `echo $m $e $2 | awk '{print ($1 * 2^$2) / $3}'`
+}
+
+
+# #########################################################
+rw_vc () {
+# usage: rw_vc <bus> <addr> <current divisor> <channel> <value>
+
+# select channel
+if [ $4 != "x" ]
+then
+ i2cset -y $1 $2 0 $4 b
+fi
+
+# write new voltage set point
+if [ ! -e $5 ]
+then
+ i2cset -y $1 $2 0x21 `d2v $5` w
+fi
+
+# print voltage set point
+v2d `i2cget -y $1 $2 0x21 w`
+
+# print voltage
+v2d `i2cget -y $1 $2 0x8B w`
+
+# print current
+i2d `i2cget -y $1 $2 0x8C w` $3
+
+# default back to channel 0
+if [ $4 != "x" ]
+then
+ i2cset -y $1 $2 0 0 b
+fi
+}
+
+
+# #########################################################
+# Main
+
+if [ -e $1 ]
+then
+ $0 vdda vcsa vdna vioa vddra vppa vddb vcsb vdnb viob vddrb vppb
+ exit
+fi
+
+if [ $1 == "-h" ]
+then
+ echo " Usage: vrm [<rail>=[value] [<rail>=[value]] ...]"
+ echo " rail: vdda vcsa vdna vioa vddra vppa vddb vcsb vdnb viob vddrb vppb vdnd viod"
+ echo " value: volts"
+ echo
+ echo " e.g., vrm vioa=1.0 viob=1.0"
+ echo
+ exit
+fi
+
+echo "rail set read current"
+echo "------- ------- ------- -------"
+for param in ${@:1}
+do
+ rail=`echo $param | cut -d'=' -f 1`
+ val=`echo ${param}= | cut -d'=' -f 2`
+ echo -n "$rail"
+ case "$rail" in
+ vdda)
+ rw_vc 4 0x70 2 0 $val
+ ;;
+ vddb)
+ rw_vc 5 0x70 2 0 $val
+ ;;
+ vcsa)
+ rw_vc 4 0x70 4 1 $val
+ ;;
+ vcsb)
+ rw_vc 5 0x70 4 1 $val
+ ;;
+ vdna)
+ rw_vc 4 0x71 2 0 $val
+ ;;
+ vdnb)
+ rw_vc 5 0x71 2 0 $val
+ ;;
+ vioa)
+ rw_vc 4 0x40 2 x $val
+ ;;
+ viob)
+ rw_vc 5 0x40 2 x $val
+ ;;
+ vddra)
+ rw_vc 4 0x71 2 1 $val
+ ;;
+ vddrb)
+ rw_vc 5 0x71 2 1 $val
+ ;;
+ vppa)
+ rw_vc 12 0x41 2 x $val
+ ;;
+ vppb)
+ rw_vc 13 0x41 2 x $val
+ ;;
+ vdnd)
+ rw_vc 2 0x70 2 0 $val
+ ;;
+ viod)
+ rw_vc 2 0x70 2 1 $val
+ ;;
+ *)
+ echo " non-existant"
+ esac
+done
diff --git a/meta-witherspoon/recipes-phosphor/chassis/vrm-control/vrm-control@.service b/meta-witherspoon/recipes-phosphor/chassis/vrm-control/vrm-control@.service
new file mode 100644
index 0000000..716c526
--- /dev/null
+++ b/meta-witherspoon/recipes-phosphor/chassis/vrm-control/vrm-control@.service
@@ -0,0 +1,14 @@
+[Unit]
+Description=Apply voltage overrides to VRMs
+Wants=avsbus-disable@%i.service
+After=avsbus-disable@%i.service
+Before=avsbus-enable@%i.service
+Conflicts=obmc-chassis-stop@%i.target
+
+[Service]
+ExecStart={bindir}/vrm-control.sh vdna=0.9 vddra=1.35 vdnb=0.9 vddrb=1.35
+Type=oneshot
+RemainAfterExit=yes
+
+[Install]
+WantedBy=obmc-chassis-start@%i.target