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#!/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
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