ibm: p10bmc: Add I2C mux workarounds

On Everest systems, some BMC cards need various I2C muxes reset
before they will work. Add a script to reset the muxes and probe
the necessary drivers afterwards.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
Change-Id: I39de4bbe9dd698a6d3e364e3a186a05551f21caa

meta-ibm/recipes-phosphor/chassis/mux-workarounds.bb

@@ -0,0 +1,20 @@
+SUMMARY = "I2C Mux Device Workarounds"
+PR = "r1"
+LICENSE = "Apache-2.0"
+LIC_FILES_CHKSUM = "file://${COREBASE}/meta/files/common-licenses/Apache-2.0;md5=89aea4e17d99a7cacdbeed46a0096b10"
+
+inherit allarch
+inherit obmc-phosphor-systemd
+
+RDEPENDS_${PN} += "i2c-tools"
+
+S = "${WORKDIR}"
+
+SRC_URI += "file://mux-workarounds.sh"
+
+do_install() {
+        install -d ${D}${bindir}
+        install -m 0755 ${S}/mux-workarounds.sh ${D}${bindir}/mux-workarounds.sh
+}
+
+SYSTEMD_SERVICE_${PN} := "mux-workarounds.service"

meta-ibm/recipes-phosphor/chassis/mux-workarounds/mux-workarounds.service

@@ -0,0 +1,12 @@
+[Unit]
+Description=Perform workarounds for I2C Muxes
+Wants=sysinit.target
+After=sysinit.target
+
+[Service]
+ExecStart=/usr/bin/mux-workarounds.sh
+Type=oneshot
+RemainAfterExit=yes
+
+[Install]
+RequiredBy=basic.target

meta-ibm/recipes-phosphor/chassis/mux-workarounds/mux-workarounds.sh

@@ -0,0 +1,69 @@
+#!/bin/sh
+set -eu
+
+reset_bus_4() {
+    i2cset -f -y 0 0x61 7 0x15 b
+    sleep 0.1
+    i2cset -f -y 0 0x61 7 0x55 b
+    sleep 0.1
+}
+
+reset_buses_5_6_and_14() {
+    i2cset -f -y 0 0x61 8 0x10 b
+    sleep 0.1
+    i2cset -f -y 0 0x61 8 0x55 b
+    sleep 0.1
+}
+
+reset_bus_15() {
+    i2cset -f -y 0 0x61 9 0x54 b
+    sleep 0.1
+    i2cset -f -y 0 0x61 9 0x55 b
+    sleep 0.1
+}
+
+# everest system only
+if [ $(fw_printenv fitconfig | grep everest) ]; then
+    mux4=
+    mux5=
+    mux6=
+    mux140=
+    mux141=
+    mux150=
+    mux151=
+    mux152=
+    echo "Detected everest system; performing I2C mux workarounds"
+
+    gpiopath="/sys/bus/platform/drivers/gpio-keys-polled"
+    drvpath="/sys/bus/i2c/drivers/pca954x"
+
+    # remove gpio dependencies
+    echo gpio-keys-polled > $gpiopath/unbind
+
+    # bus 4
+    if [ -e $drvpath/4-0070 ]; then mux4=1; echo 4-0070 > $drvpath/unbind; fi
+    reset_bus_4
+    if [ -n "$mux4" ]; then echo 4-0070 > $drvpath/bind; fi
+
+    # buses 5, 6, and 14
+    if [ -e $drvpath/5-0070 ]; then mux5=1; echo 5-0070 > $drvpath/unbind; fi
+    if [ -e $drvpath/6-0070 ]; then mux6=1; echo 6-0070 > $drvpath/unbind; fi
+    if [ -e $drvpath/14-0070 ]; then mux140=1; echo 14-0070 > $drvpath/unbind; fi
+    if [ -e $drvpath/14-0071 ]; then mux141=1; echo 14-0071 > $drvpath/unbind; fi
+    reset_buses_5_6_and_14
+    if [ -n "$mux5" ]; then echo 5-0070 > $drvpath/bind; fi
+    if [ -n "$mux6" ]; then echo 6-0070 > $drvpath/bind; fi
+    if [ -n "$mux140" ]; then echo 14-0070 > $drvpath/bind; fi
+    if [ -n "$mux141" ]; then echo 14-0071 > $drvpath/bind; fi
+
+    # bus 15
+    if [ -e $drvpath/15-0070 ]; then mux150=1; echo 15-0070 > $drvpath/unbind; fi
+    if [ -e $drvpath/15-0071 ]; then mux151=1; echo 15-0071 > $drvpath/unbind; fi
+    if [ -e $drvpath/15-0072 ]; then mux152=1; echo 15-0072 > $drvpath/unbind; fi
+    reset_bus_15
+    if [ -n "$mux150" ]; then  echo 15-0070 > $drvpath/bind; fi
+    if [ -n "$mux151" ]; then  echo 15-0071 > $drvpath/bind; fi
+    if [ -n "$mux152" ]; then  echo 15-0072 > $drvpath/bind; fi
+
+    echo gpio-keys-polled > $gpiopath/bind
+fi

meta-ibm/recipes-phosphor/packagegroups/packagegroup-obmc-apps.bbappend

@@ -33,7 +33,7 @@ RDEPENDS:${PN}-fan-control:append:ibm-ac-server = " fan-watchdog"
 RDEPENDS:${PN}-fan-control:append:p10bmc = " fan-watchdog sensor-monitor"
 RDEPENDS:${PN}-extras:append:ibm-ac-server = " ${POWER_SERVICE_PACKAGES_AC_SERVER} witherspoon-power-supply-sync phosphor-webui mctp pldm"
 RDEPENDS:${PN}-extras:append:p10bmc = " ${POWER_SERVICE_PACKAGES_P10} webui-vue dbus-sensors phosphor-virtual-sensor kexec-tools makedumpfile kdump vmcore-dmesg"
-RDEPENDS:${PN}-extras:append:p10bmc = " pldm openpower-hw-diags srvcfg-manager biosconfig-manager phosphor-post-code-manager phosphor-host-postd debug-trigger mctp panel"
+RDEPENDS:${PN}-extras:append:p10bmc = " pldm openpower-hw-diags srvcfg-manager biosconfig-manager phosphor-post-code-manager phosphor-host-postd debug-trigger mctp panel mux-workarounds"
 RDEPENDS:${PN}-extras:append:mihawk = " phosphor-webui phosphor-image-signing wistron-ipmi-oem ${POWER_SERVICE_PACKAGES_AC_SERVER}"
 RDEPENDS:${PN}-extras:append:witherspoon-tacoma = " pldm srvcfg-manager webui-vue biosconfig-manager phosphor-post-code-manager phosphor-host-postd kexec-tools makedumpfile kdump vmcore-dmesg debug-trigger"
 RDEPENDS:${PN}-extras:append:witherspoon-tacoma = " openpower-hw-diags panel"