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#!/bin/bash
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# shellcheck disable=SC2046
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# shellcheck source=meta-ampere/meta-mitchell/recipes-ampere/platform/ampere-platform-init/gpio-lib.sh
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source /usr/sbin/gpio-lib.sh
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spi_address="1e630000.spi"
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spi_bind="/sys/bus/platform/drivers/spi-aspeed-smc/bind"
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spi_unbind="/sys/bus/platform/drivers/spi-aspeed-smc/unbind"
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spi_lock="/run/platform/spi.lock"
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spi_lock_dir="/run/platform"
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bind_aspeed_smc_driver() {
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if [ -f "${spi_lock}" ]; then
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pid=$1
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pid_lock=$(cat "${spi_lock}")
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if [[ "${pid}" != "${pid_lock}" ]]; then
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echo "SPI-NOR resoure is lock by process $pid_lock"
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return 1
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fi
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fi
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# BMC access SPI-NOR resource
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gpio_name_set spi0-program-sel 1
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sleep 0.1
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echo "Bind the ASpeed SMC driver"
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echo "${spi_address}" > "${spi_bind}" 2>/dev/null
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# Check the HNOR partition available
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HOST_MTD=$(< /proc/mtd grep "pnor" | sed -n 's/^\(.*\):.*/\1/p')
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if [ -z "$HOST_MTD" ]; then
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echo "${spi_address}" > "${spi_unbind}"
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sleep 0.1
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echo "${spi_address}" > "${spi_bind}"
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fi
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# BMC release SPI-NOR resource
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gpio_name_set spi0-program-sel 0
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return 0
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}
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unbind_aspeed_smc_driver() {
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if [ -f "${spi_lock}" ]; then
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pid=$1
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pid_lock=$(cat "${spi_lock}")
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if [[ "${pid}" != "${pid_lock}" ]]; then
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echo "SPI-NOR resoure is lock by process $pid_lock . Wait 10s"
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# Wait maximum 10 seconds for unlock SPI-NOR
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cnt=10
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while [ $cnt -gt 0 ]
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do
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if [ -f "${spi_lock}" ]; then
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sleep 1
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cnt=$((cnt - 1))
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else
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break
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fi
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done
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if [ "$cnt" -eq "0" ]; then
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echo "Timeout 10 seconds, SPI-NOR still busy. Force unlock to access SPI"
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rm -f "${spi_lock}"
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fi
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fi
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fi
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HOST_MTD=$(< /proc/mtd grep "pnor" | sed -n 's/^\(.*\):.*/\1/p')
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if [ -n "$HOST_MTD" ]; then
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# If the HNOR partition is available, then unbind driver
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# BMC access SPI-NOR resource
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gpio_name_set spi0-program-sel 1
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sleep 0.1
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echo "Unbind the ASpeed SMC driver"
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echo "${spi_address}" > "${spi_unbind}"
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fi
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# BMC release SPI-NOR resource
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gpio_name_set spi0-program-sel 0
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# Deassert BMC access SPI-NOR pin
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gpio_name_set spi-nor-access 0
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sleep 0.5
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return 0
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}
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lock_spi_resource() {
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# Wait maximum 10 seconds to lock SPI-NOR
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cnt=10
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while [ $cnt -gt 0 ]
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do
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if [ -f "${spi_lock}" ]; then
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sleep 1
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cnt=$((cnt - 1))
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else
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echo "$1" > "${spi_lock}"
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break
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fi
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done
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if [ "$cnt" -eq "0" ]; then
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echo "Timeout 10 seconds, SPI-NOR is still locked by another process"
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return 1
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fi
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return 0
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}
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unlock_spi_resource() {
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if [ ! -f "${spi_lock}" ]; then
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echo "SPI-NOR is already unlocked"
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return 0
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fi
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pid=$1
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pid_lock=$(cat "${spi_lock}")
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if [[ "${pid}" == "${pid_lock}" ]]; then
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rm -f "${spi_lock}"
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else
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echo "Cannot unlock, SPI-NOR is locked by another process"
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return 1
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fi
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return 0
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}
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start_handshake_spi() {
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if [ -f "${spi_lock}" ]; then
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pid=$1
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pid_lock=$(cat "${spi_lock}")
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if [[ "${pid}" != "${pid_lock}" ]]; then
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echo "SPI-NOR resoure is lock by process $pid_lock"
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return 1
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fi
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fi
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# Wait maximum 10 seconds to grant access SPI
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cnt=10
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while [ $cnt -gt 0 ]
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do
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spinor_access=$(gpio_name_get soc-spi-nor-access)
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if [ "$spinor_access" == "1" ]; then
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sleep 1
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cnt=$((cnt - 1))
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else
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break
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fi
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done
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if [ "$cnt" -eq "0" ]; then
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echo "Timeout 10 seconds, host is still hold SPI-NOR."
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return 1
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fi
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echo "Start handshake SPI-NOR"
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# Grant BMC access SPI-NOR. The process call the scripts should only
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# claim the bus for only maximum period 500ms.
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gpio_name_set spi-nor-access 1
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# Switch the Host SPI-NOR to BMC
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gpio_name_set spi0-program-sel 1
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}
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stop_handshake_spi() {
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if [ -f "${spi_lock}" ]; then
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pid=$1
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pid_lock=$(cat "${spi_lock}")
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if [[ "${pid}" != "${pid_lock}" ]]; then
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echo "SPI-NOR resoure is lock by process $pid_lock"
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return 1
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fi
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fi
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echo "Stop handshake SPI-NOR"
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# Switch the Host SPI-NOR to HOST
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gpio_name_set spi0-program-sel 0
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# Deassert BMC access SPI-NOR pin
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gpio_name_set spi-nor-access 0
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}
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if [ $# -eq 0 ]; then
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echo "Usage:"
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echo " - Handshake access SPI-NOR "
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echo " $(basename "$0") cmd pid"
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echo " <cmd>:"
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echo " lock - lock the SPI-NOR resource"
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echo " unlock - unlock the SPI-NOR resource"
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echo " bind - bind the SPI-NOR resource"
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echo " unbind - unbind the SPI-NOR resource"
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echo " start_handshake - start handshake between BMC and Host"
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echo " stop_handshake - release handshake between BMC and Host"
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echo " <pid>: Optional - PID of the process call script"
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exit 0
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fi
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CMD=$1
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if [ ! -d "${spi_lock_dir}" ]; then
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mkdir -p "${spi_lock_dir}"
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fi
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if [ -z "$2" ]; then
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PID=$$
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else
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PID=$2
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fi
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if [[ "${CMD}" == "lock" ]]; then
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lock_spi_resource "${PID}"
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ret=$?
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if [[ "${ret}" == "1" ]]; then
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echo "Cannot lock SPI-NOR, the resource is busy"
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exit 1
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fi
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elif [[ "${CMD}" == "unlock" ]]; then
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unlock_spi_resource "${PID}"
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ret=$?
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if [[ "${ret}" == "1" ]]; then
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echo "Cannot unlock SPI-NOR, the resource is busy"
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exit 1
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fi
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elif [[ "${CMD}" == "bind" ]]; then
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bind_aspeed_smc_driver "${PID}"
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ret=$?
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if [[ "${ret}" == "1" ]]; then
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echo "Cannot bind SPI-NOR, the resource is busy"
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exit 1
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fi
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elif [[ "${CMD}" == "unbind" ]]; then
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unbind_aspeed_smc_driver "${PID}"
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ret=$?
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if [[ "${ret}" == "1" ]]; then
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echo "Cannot unbind SPI-NOR, the resource is busy"
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exit 1
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fi
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elif [[ "${CMD}" == "start_handshake" ]]; then
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start_handshake_spi "${PID}"
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ret=$?
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if [[ "${ret}" == "1" ]]; then
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echo "Cannot start handshake SPI-NOR"
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exit 1
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fi
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elif [[ "${CMD}" == "stop_handshake" ]]; then
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stop_handshake_spi "${PID}"
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ret=$?
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if [[ "${ret}" == "1" ]]; then
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echo "Cannot stop handshake SPI-NOR"
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exit 1
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fi
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fi
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exit 0
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