db0f44ec8e
Add os_tty_set_params() function to configure terminal devices for serial communication with TKey devices: - Custom baud rate of 62500 using termios2 - 8n1 configuration (8 data bits, no parity, 1 stop bit) - Raw mode for binary communication - Appropriate timeouts for frame-based protocols This is needed for serial-based TKey communication on sandbox, allowing U-Boot to communicate with TKey security tokens via a serial port. Co-developed-by: Claude <noreply@anthropic.com> Signed-off-by: Simon Glass <sjg@chromium.org>
57 lines
1.5 KiB
C
57 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2024 U-Boot TKey Support
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*
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* TTY configuration for TKey serial communication
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*/
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#define _GNU_SOURCE
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#include <errno.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <asm/termbits.h>
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#include <sys/ioctl.h>
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#include <linux/serial.h>
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int os_tty_set_params(int fd)
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{
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struct termios2 tty2;
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/* Get current termios2 attributes */
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if (ioctl(fd, TCGETS2, &tty2) != 0)
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return -errno;
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/* Configure for raw mode */
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tty2.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IXON);
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tty2.c_oflag &= ~OPOST;
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tty2.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
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tty2.c_cflag &= ~(CSIZE | PARENB);
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/* 8N1 configuration */
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tty2.c_cflag |= CS8; /* 8 data bits */
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tty2.c_cflag &= ~PARENB; /* No parity */
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tty2.c_cflag &= ~CSTOPB; /* 1 stop bit */
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tty2.c_cflag |= (CLOCAL | CREAD); /* Enable receiver, ignore modem lines */
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/* Set custom baud rate using termios2 */
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tty2.c_cflag &= ~CBAUD;
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tty2.c_cflag |= BOTHER; /* Use custom baud rate */
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tty2.c_ispeed = 62500; /* Input speed */
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tty2.c_ospeed = 62500; /* Output speed */
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/* Blocking with timeout for complete frames */
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tty2.c_cc[VMIN] = 1; /* Wait for at least 1 character */
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tty2.c_cc[VTIME] = 50; /* 5 second timeout */
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/* Apply termios2 settings */
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if (ioctl(fd, TCSETS2, &tty2) != 0)
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return -errno;
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/* Flush buffers */
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if (ioctl(fd, TCFLSH, TCIOFLUSH) != 0)
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return -errno;
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return 0;
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}
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