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166 lines
4.2 KiB
Bash
166 lines
4.2 KiB
Bash
#!/bin/bash
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# Copyright 2020 Google LLC
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# Copyright 2020 Quanta Computer Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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# Common GPIO functions.
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# Map names of GPIOs to GPIO number
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declare -A GPIO_NAMES_TO_NUMBER=(
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['RST_BMC_PHY_N']=15
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['BMC_BRD_REV_ID6']=37
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['BMC_BRD_REV_ID5']=38
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['BMC_BRD_SKU_ID3']=39
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['BMC_BRD_SKU_ID2']=40
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['FM_BMC_CPU_UART_EN']=76
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['RST_BMC_RSMRST_N']=87
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['RST_KBRST_BMC_CPLD_N']=94
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['FAN_BRD_REV_ID0']=122
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['FAN_BRD_REV_ID1']=123
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['HSBP_BRD_REV_ID3']=124
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['HSBP_BRD_REV_ID2']=125
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['HSBP_BRD_REV_ID1']=126
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['BMC_BRD_REV_ID0']=136
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['BMC_BRD_REV_ID1']=137
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['BMC_BRD_REV_ID2']=138
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['BMC_BRD_REV_ID3']=139
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['BMC_BRD_REV_ID4']=140
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['BMC_BRD_SKU_ID0']=141
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['BMC_BRD_SKU_ID1']=142
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['HDD_PRSNT_N']=160
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['SPI_SW_SELECT']=169
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['BMC_BRD_REV_ID7']=194
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['HSBP_BRD_REV_ID0']=196
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)
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# 1 is active_low 0 is active_high
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declare -A GPIO_NAMES_TO_ACTIVE_LOW=(
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['RST_BMC_PHY_N']=1
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['BMC_BRD_REV_ID6']=0
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['BMC_BRD_REV_ID5']=0
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['BMC_BRD_SKU_ID3']=0
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['BMC_BRD_SKU_ID2']=0
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['FM_BMC_CPU_UART_EN']=0
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['RST_BMC_RSMRST_N']=1
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['RST_KBRST_BMC_CPLD_N']=1
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['FAN_BRD_REV_ID0']=0
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['FAN_BRD_REV_ID1']=0
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['HSBP_BRD_REV_ID3']=0
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['HSBP_BRD_REV_ID2']=0
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['HSBP_BRD_REV_ID1']=0
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['BMC_BRD_REV_ID0']=0
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['BMC_BRD_REV_ID1']=0
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['BMC_BRD_REV_ID2']=0
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['BMC_BRD_REV_ID3']=0
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['BMC_BRD_REV_ID4']=0
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['BMC_BRD_SKU_ID0']=0
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['BMC_BRD_SKU_ID1']=0
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['HDD_PRSNT_N']=1
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['SPI_SW_SELECT']=0
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['BMC_BRD_REV_ID7']=0
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['HSBP_BRD_REV_ID0']=0
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)
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##################################################
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# Initializes the gpio state
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# This operation is idempotent and can be applied
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# repeatedly to the same gpio. It will make sure the
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# gpio ends up in the initialized state even if it
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# was.
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# Arguments:
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# $1: GPIO name
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# Return:
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# 0 if success, non-zero if error
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##################################################
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init_gpio() {
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if (( $# != 1 )); then
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echo "Usage: init_gpio name" >&2
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return 1
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fi
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local name=$1
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local number=${GPIO_NAMES_TO_NUMBER["${name}"]}
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if [[ -z ${number} ]]; then
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echo "Missing number info for: ${name}" >&2
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return 2
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fi
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local active_low=${GPIO_NAMES_TO_ACTIVE_LOW["${name}"]}
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if [[ -z ${active_low} ]]; then
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echo "Missing active_low info for: ${name}" >&2
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return 2
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fi
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if [[ ! -e "/sys/class/gpio/gpio${number}" ]]; then
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echo "${number}" >'/sys/class/gpio/export'
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fi
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echo "${active_low}" >"/sys/class/gpio/gpio${number}/active_low"
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}
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##################################################
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# Set output GPIO direction.
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# Arguments:
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# $1: GPIO name
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# $2: GPIO direction, "high" or "low"
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# Return:
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# 0 if success, non-zero if error
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##################################################
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set_gpio_direction() {
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if (( $# != 2 )); then
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echo 'Usage: set_gpio_direction name direction' >&2
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return 1
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fi
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local name=$1
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local direction=$2
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local number=${GPIO_NAMES_TO_NUMBER["${name}"]}
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if [[ -z ${number} ]]; then
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echo "Missing number info for: ${name}" >&2
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return 2
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fi
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init_gpio "${name}" || return
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echo "${direction}" >"/sys/class/gpio/gpio${number}/direction"
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echo "Set gpio ${name} #${number} to direction ${direction}" >&2
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}
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##################################################
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# Get GPIO value
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# Arguments:
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# $1: GPIO name
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# Return:
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# 0 if success, non-zero if error
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# stdout: The value of the gpio
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##################################################
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get_gpio_value() {
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if (( $# != 1 )); then
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echo 'Usage: get_gpio_value name' >&2
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return 1
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fi
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local name=$1
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local number=${GPIO_NAMES_TO_NUMBER["${name}"]}
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if [[ -z ${number} ]]; then
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echo "Missing number info for: ${name}" >&2
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return 2
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fi
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init_gpio "${name}" || return
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cat "/sys/class/gpio/gpio${number}/value"
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}
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