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George Hung5f2142e2020-06-19 19:45:43 +08001#!/bin/bash
2# Copyright 2020 Google LLC
3# Copyright 2020 Quanta Computer Inc.
4#
5# Licensed under the Apache License, Version 2.0 (the "License");
6# you may not use this file except in compliance with the License.
7# You may obtain a copy of the License at
8#
9# http://www.apache.org/licenses/LICENSE-2.0
10#
11# Unless required by applicable law or agreed to in writing, software
12# distributed under the License is distributed on an "AS IS" BASIS,
13# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14# See the License for the specific language governing permissions and
15# limitations under the License.
16
17#
18# Common GPIO functions.
19
20# Map names of GPIOs to GPIO number
21declare -A GPIO_NAMES_TO_NUMBER=(
22 ['RST_BMC_PHY_N']=15
23 ['BMC_BRD_REV_ID6']=37
24 ['BMC_BRD_REV_ID5']=38
25 ['BMC_BRD_SKU_ID3']=39
26 ['BMC_BRD_SKU_ID2']=40
27 ['FM_BMC_CPU_UART_EN']=76
28 ['RST_BMC_RSMRST_N']=87
29 ['RST_KBRST_BMC_CPLD_N']=94
30 ['FAN_BRD_REV_ID0']=122
31 ['FAN_BRD_REV_ID1']=123
32 ['HSBP_BRD_REV_ID3']=124
33 ['HSBP_BRD_REV_ID2']=125
34 ['HSBP_BRD_REV_ID1']=126
35 ['BMC_BRD_REV_ID0']=136
36 ['BMC_BRD_REV_ID1']=137
37 ['BMC_BRD_REV_ID2']=138
38 ['BMC_BRD_REV_ID3']=139
39 ['BMC_BRD_REV_ID4']=140
40 ['BMC_BRD_SKU_ID0']=141
41 ['BMC_BRD_SKU_ID1']=142
42 ['HDD_PRSNT_N']=160
43 ['SPI_SW_SELECT']=169
44 ['BMC_BRD_REV_ID7']=194
45 ['HSBP_BRD_REV_ID0']=196
46)
47
48# 1 is active_low 0 is active_high
49declare -A GPIO_NAMES_TO_ACTIVE_LOW=(
50 ['RST_BMC_PHY_N']=1
51 ['BMC_BRD_REV_ID6']=0
52 ['BMC_BRD_REV_ID5']=0
53 ['BMC_BRD_SKU_ID3']=0
54 ['BMC_BRD_SKU_ID2']=0
55 ['FM_BMC_CPU_UART_EN']=0
56 ['RST_BMC_RSMRST_N']=1
57 ['RST_KBRST_BMC_CPLD_N']=1
58 ['FAN_BRD_REV_ID0']=0
59 ['FAN_BRD_REV_ID1']=0
60 ['HSBP_BRD_REV_ID3']=0
61 ['HSBP_BRD_REV_ID2']=0
62 ['HSBP_BRD_REV_ID1']=0
63 ['BMC_BRD_REV_ID0']=0
64 ['BMC_BRD_REV_ID1']=0
65 ['BMC_BRD_REV_ID2']=0
66 ['BMC_BRD_REV_ID3']=0
67 ['BMC_BRD_REV_ID4']=0
68 ['BMC_BRD_SKU_ID0']=0
69 ['BMC_BRD_SKU_ID1']=0
70 ['HDD_PRSNT_N']=1
71 ['SPI_SW_SELECT']=0
72 ['BMC_BRD_REV_ID7']=0
73 ['HSBP_BRD_REV_ID0']=0
74)
75
76##################################################
77# Initializes the gpio state
78# This operation is idempotent and can be applied
79# repeatedly to the same gpio. It will make sure the
80# gpio ends up in the initialized state even if it
81# was.
82# Arguments:
83# $1: GPIO name
84# Return:
85# 0 if success, non-zero if error
86##################################################
87init_gpio() {
88 if (( $# != 1 )); then
89 echo "Usage: init_gpio name" >&2
90 return 1
91 fi
92
93 local name=$1
94
95 local number=${GPIO_NAMES_TO_NUMBER["${name}"]}
96 if [[ -z ${number} ]]; then
97 echo "Missing number info for: ${name}" >&2
98 return 2
99 fi
100
101 local active_low=${GPIO_NAMES_TO_ACTIVE_LOW["${name}"]}
102 if [[ -z ${active_low} ]]; then
103 echo "Missing active_low info for: ${name}" >&2
104 return 2
105 fi
106
107 if [[ ! -e "/sys/class/gpio/gpio${number}" ]]; then
108 echo "${number}" >'/sys/class/gpio/export'
109 fi
110 echo "${active_low}" >"/sys/class/gpio/gpio${number}/active_low"
111}
112
113##################################################
114# Set output GPIO direction.
115# Arguments:
116# $1: GPIO name
117# $2: GPIO direction, "high" or "low"
118# Return:
119# 0 if success, non-zero if error
120##################################################
121set_gpio_direction() {
122 if (( $# != 2 )); then
123 echo 'Usage: set_gpio_direction name direction' >&2
124 return 1
125 fi
126
127 local name=$1
128 local direction=$2
129
130 local number=${GPIO_NAMES_TO_NUMBER["${name}"]}
131 if [[ -z ${number} ]]; then
132 echo "Missing number info for: ${name}" >&2
133 return 2
134 fi
135
136 init_gpio "${name}" || return
137 echo "${direction}" >"/sys/class/gpio/gpio${number}/direction"
138 echo "Set gpio ${name} #${number} to direction ${direction}" >&2
139}
140
141##################################################
142# Get GPIO value
143# Arguments:
144# $1: GPIO name
145# Return:
146# 0 if success, non-zero if error
147# stdout: The value of the gpio
148##################################################
149get_gpio_value() {
150 if (( $# != 1 )); then
151 echo 'Usage: get_gpio_value name' >&2
152 return 1
153 fi
154
155 local name=$1
156
157 local number=${GPIO_NAMES_TO_NUMBER["${name}"]}
158 if [[ -z ${number} ]]; then
159 echo "Missing number info for: ${name}" >&2
160 return 2
161 fi
162
163 init_gpio "${name}" || return
164 cat "/sys/class/gpio/gpio${number}/value"
165}