| #!/bin/bash |
| # |
| # Copyright (c) 2021 Ampere Computing LLC |
| # |
| # Licensed under the Apache License, Version 2.0 (the "License"); |
| # you may not use this file except in compliance with the License. |
| # You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, software |
| # distributed under the License is distributed on an "AS IS" BASIS, |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| # See the License for the specific language governing permissions and |
| # limitations under the License. |
| |
| # Ampere Computing LLC: UART MUX/DEMUX for CPU0 UART0,1,4 and CPU1 UART1 |
| # Usage: ampere_uartmux_ctrl.sh <CPU UART port number> <UARTx_MODE> |
| # <UARTx_MODE> of 1 sets CPU To HDR_CONN |
| # <UARTx_MODE> of 2 sets BMC to CPU (eg dropbear ssh server on port 2200) |
| |
| # shellcheck source=/dev/null |
| source /usr/sbin/gpio-lib.sh |
| |
| if [ $# -lt 2 ]; then |
| exit 1 |
| fi |
| |
| case "$1" in |
| 1) GPIO_UARTx_MODE0=56 |
| # CPU0 UART0 connects to BMC UART1 |
| CONSOLE_PORT=0 |
| ;; |
| 2) GPIO_UARTx_MODE0=57 |
| # CPU0 UART1 connects to BMC UART2 |
| CONSOLE_PORT=1 |
| ;; |
| 3) GPIO_UARTx_MODE0=58 |
| # CPU0 UART4 connects to BMC UART3 |
| CONSOLE_PORT=2 |
| ;; |
| 4) GPIO_UARTx_MODE0=59 |
| # CPU1 UART1 connects to BMC UART4 |
| CONSOLE_PORT=3 |
| ;; |
| *) echo "Invalid UART port selection" |
| exit 1 |
| ;; |
| esac |
| |
| # Only switch the MUX when there is no active connection. This means we only |
| # switch the MUX before the first session starts and after the last session |
| # closes. We do this by querying number of connected sessions to the socket |
| # of requested console port. |
| # Example format: Accepted: 1; Connected: 1; |
| CONNECTED=$(systemctl --no-pager status obmc-console-ttyS${CONSOLE_PORT}-ssh.socket | grep -w Connected | cut -d ':' -f 3 | tr -d ' ;') |
| if [ ! "$CONNECTED" -le 1 ]; then |
| exit 0 |
| fi |
| |
| echo "Ampere UART MUX CTRL UART port $1 to mode $2" |
| |
| case "$2" in |
| 1) gpio_configure_output "${GPIO_UARTx_MODE0}" 0 |
| exit 0 |
| ;; |
| 2) gpio_configure_output "${GPIO_UARTx_MODE0}" 1 |
| exit 0 |
| ;; |
| *) echo "Invalid UART mode selection" |
| exit 1 |
| ;; |
| esac |