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### NVME SSD Power Control Manager
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#### Description
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The package mantains for SSD power control and related noification handle Deamon
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#### Design
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The service power supply design follow PCI Express Card Electromechanical Specification Revision 3.0 in Section 2.2
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nvme_gpio.service follow section 2.2.1 Initial power-Up to initinal and adjust related signal.
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nvme_powermanager.service follow section 2.2.2 power management states monitor PRESENT signal and update related signal.
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#### Process
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* Plugging
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1. U2_[SSD_index] PRSNT_N will be input low
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2. Set PWR_U2_[SSD_index]_EN to high
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3. Check PWRGD_U2_[SSD_index] is high
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4-1. If PWRGD_U2_[SSD_index] is high (PWR Good)
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- Wait 5ms
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- Enable PCI Clock by SMBus 9FGL0851
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- Wait 100ms
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- Set RST_BMC_U2 to high
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4-2. If PWRGD_U2_[SSD_index] is low (PWR Fail)
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- Set RST_BMC_U2_[SSD_index]_R_N to low
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- Wait 100ms
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- Disable PCI Clock by SMBus
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* Removing
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1. U2_[SSD_index] PRSNT_N will be input high
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2. Set RST_BMC_U2 to low
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3. Wait 100ms
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4. Disable PCI Clock by SMBus
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5. Wait 5ms
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6. PWR_U2_[SSD_index]_EN to low
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#### Test
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1. PRESENT detect SSD: The hardware design has been implemented.
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2. Initial SSD slot Power output: nvme_gpio service has tested on Module. It could sucess initial gpios and set correct power output.
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3. Detect PRESENT and change power setting: nvme_powermanager service has tested on Module. It could success detect SSD plugged or removal change power output.
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4. Improve initial power-up sequence: For matched hardware default initial power-up setting, the nvme_gpio service only set unplugged slot related signal.
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5. Improve service execute sequence: nvme_powermanager.service must wait for nvme_gpio.service ensure gpio export complete.
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#!/bin/bash
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# shellcheck source=meta-quanta/meta-gsj/recipes-gsj/quanta-nvme-powerctrl/files/nvme_powerctrl_library.sh
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source /usr/libexec/nvme_powerctrl_library.sh
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function set_gpio() {
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#$1 gpio pin
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echo "$1" > /sys/class/gpio/export
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}
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echo "Read Clock Gen Value is: $CLOCK_GEN_VALUE"
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## Initial U2_PRESENT_N
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for i in "${!U2_PRESENT[@]}";
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do
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set_gpio "${U2_PRESENT[$i]}";
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set_gpio_direction "${U2_PRESENT[$i]}" 'in';
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echo "Read $i SSD present: $(read_gpio_input "${U2_PRESENT[$i]}")"
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done
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## Initial POWER_U2_EN
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for i in "${!POWER_U2[@]}";
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do
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set_gpio "${POWER_U2[$i]}";
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done
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## Initial PWRGD_U2
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for i in "${!PWRGD_U2[@]}";
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do
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set_gpio "${PWRGD_U2[$i]}";
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set_gpio_direction "${PWRGD_U2[$i]}" 'in';
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echo "Read $i SSD Power Good: $(read_gpio_input "${PWRGD_U2[$i]}")"
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done
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## Initial RST_BMC_U2
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for i in "${!RST_BMC_U2[@]}";
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do
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set_gpio "${RST_BMC_U2[$i]}";
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done
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### Initial related Power by Present
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for i in {0..7};
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do
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update_value=$(printf '%x\n' "$((0x01 << i))")
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if [ "$(read_gpio_input "${U2_PRESENT[$i]}")" == $PLUGGED ];then
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CLOCK_GEN_VALUE=$(printf '0x%x\n' \
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"$((CLOCK_GEN_VALUE | 0x$update_value))")
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else
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set_gpio_direction "${RST_BMC_U2[$i]}" "low"
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set_gpio_direction "${POWER_U2[$i]}" "low"
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CLOCK_GEN_VALUE=$(printf '0x%x\n' \
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"$((CLOCK_GEN_VALUE & ~0x$update_value))")
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fi
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done
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i2cset -y $I2C_BUS $CHIP_ADDR 0 "$CLOCK_GEN_VALUE" s
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echo "Read Clock Gen Value again is: $CLOCK_GEN_VALUE"
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exit 0;
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[Unit]
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Description = configure GPIO for SSD Power Control
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Before=nvme_powermanager.service
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[Service]
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Restart=no
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RemainAfterExit=true
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Type=oneshot
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ExecStart=/usr/bin/init_once.sh
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[Install]
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WantedBy=multi-user.target
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+65
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#!/bin/bash
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export U2_PRESENT=( 148 149 150 151 152 153 154 155 )
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export POWER_U2=( 195 196 202 199 198 197 127 126 )
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export PWRGD_U2=( 161 162 163 164 165 166 167 168 )
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export RST_BMC_U2=( 72 73 74 75 76 77 78 79 )
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export PLUGGED=0
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export I2C_BUS=8
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export CHIP_ADDR=0x68
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export CLOCK_GEN_VALUE=
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CLOCK_GEN_VALUE=$(i2cget -y $I2C_BUS $CHIP_ADDR 0 i 2|cut -f3 -d' ')
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function set_gpio_direction()
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{
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#$1 gpio pin, $2 'in','high','low'
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echo "$2" > "/sys/class/gpio/gpio$1/direction"
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}
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function read_gpio_input()
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{
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#$1 read input gpio pin
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cat "/sys/class/gpio/gpio$1/value"
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}
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function enable_nvme_power()
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{
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set_gpio_direction "${POWER_U2[$1]}" "high"
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sleep 0.04
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check_powergood "$1"
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}
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function check_powergood()
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{
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if [ "$(read_gpio_input "${PWRGD_U2[$1]}")" == 1 ];then
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sleep 0.005
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update_clock_gen_chip_register "$1" 1
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sleep 0.1
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set_gpio_direction "${RST_BMC_U2[$1]}" "high"
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else
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disable_nvme_power "$1"
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fi
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}
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function disable_nvme_power()
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{
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set_gpio_direction "${RST_BMC_U2[$1]}" "low"
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sleep 0.1
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update_clock_gen_chip_register "$1" 0
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sleep 0.005
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set_gpio_direction "${POWER_U2[$1]}" "low"
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}
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function update_clock_gen_chip_register(){
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#$1 nvme slot number, $2 enable/disable
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update_value=$(printf '%x\n' "$((0x01 <<$1))")
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if [ "$2" -eq 1 ];then
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CLOCK_GEN_VALUE=$(printf '0x%x\n' \
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"$((CLOCK_GEN_VALUE | 0x$update_value))")
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else
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CLOCK_GEN_VALUE=$(printf '0x%x\n' \
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"$((CLOCK_GEN_VALUE & ~0x$update_value))")
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fi
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i2cset -y $I2C_BUS $CHIP_ADDR 0 "$CLOCK_GEN_VALUE" s
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}
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[Unit]
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Description=SSD NVME Power Manager
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Requires=nvme_gpio.service
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After=nvme_gpio.service
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[Service]
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ExecStart=/usr/bin/nvme_powermanager.sh
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Restart=always
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[Install]
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WantedBy=multi-user.target
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#!/bin/bash
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# shellcheck source=meta-quanta/meta-gsj/recipes-gsj/quanta-nvme-powerctrl/files/nvme_powerctrl_library.sh
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source /usr/libexec/nvme_powerctrl_library.sh
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U2_PRESENT_STATUS=( 1 1 1 1 1 1 1 1 )
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function recovery_power()
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{
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set_gpio_direction "${POWER_U2[$1]}" "low"
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sleep 0.2
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set_gpio_direction "${POWER_U2[$1]}" "high"
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sleep 0.2
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check_powergood "$1"
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}
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##Initial U2 present status
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for i in {0..7};
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do
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U2_PRESENT_STATUS[i]=$(read_gpio_input "${U2_PRESENT[$i]}")
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done
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## Loop while
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while :
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do
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for i in {0..7};
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do
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## 1 second scan all loop
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sleep 0.125
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read_present=$(read_gpio_input "${U2_PRESENT[$i]}")
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if [ "$read_present" != "${U2_PRESENT_STATUS[$i]}" ];then
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U2_PRESENT_STATUS[i]="$read_present"
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if [ "$read_present" == $PLUGGED ];then
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echo "NVME $i Enable Power"
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enable_nvme_power "$i"
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else
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echo "NVME $i Disable Power"
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disable_nvme_power "$i"
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fi
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else
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if [ "${U2_PRESENT_STATUS[$i]}" == $PLUGGED ] &&
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[ "$(read_gpio_input "${PWRGD_U2[$i]}")" == 0 ];then
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echo "NVME $i Recovery Power"
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recovery_power "$i"
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fi
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fi
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done
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done
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SUMMARY = "Phosphor OpenBMC Quanta NVME Power Control Service"
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DESCRIPTION = "Phosphor OpenBMC Quanta NVME Power Control Daemon."
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PR = "r1"
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LICENSE = "Apache-2.0"
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LIC_FILES_CHKSUM = "file://${COREBASE}/meta/files/common-licenses/Apache-2.0;md5=89aea4e17d99a7cacdbeed46a0096b10"
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FILESEXTRAPATHS:append := "${THISDIR}/files:"
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inherit systemd
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DEPENDS += "systemd"
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RDEPENDS:${PN} += "libsystemd"
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RDEPENDS:${PN} += "bash"
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RDEPENDS:${PN} += "iotools"
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SRC_URI += "file://init_once.sh \
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file://nvme_powermanager.sh \
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file://nvme_powerctrl_library.sh \
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file://nvme_gpio.service \
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file://nvme_powermanager.service \
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"
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do_install () {
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install -d ${D}${bindir}
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install -m 0755 ${WORKDIR}/init_once.sh ${D}${bindir}/
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install -m 0755 ${WORKDIR}/nvme_powermanager.sh ${D}${bindir}/
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install -d ${D}${libexecdir}
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install -m 0755 ${WORKDIR}/nvme_powerctrl_library.sh ${D}${libexecdir}/
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install -d ${D}${systemd_unitdir}/system/
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install -m 0644 ${WORKDIR}/nvme_gpio.service ${D}${systemd_unitdir}/system
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install -m 0644 ${WORKDIR}/nvme_powermanager.service ${D}${systemd_unitdir}/system
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}
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SYSTEMD_PACKAGES = "${PN}"
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SYSTEMD_SERVICE:${PN} = "nvme_gpio.service nvme_powermanager.service"
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