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- /*
- * Copyright (C) 2014 Michael Brown <mbrown@fensystems.co.uk>.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of the
- * License, or any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301, USA.
- *
- * You can also choose to distribute this program under the terms of
- * the Unmodified Binary Distribution Licence (as given in the file
- * COPYING.UBDL), provided that you have satisfied its requirements.
- */
-
- FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
-
- /** @file
- *
- * Serial console
- *
- */
-
- #include <stddef.h>
- #include <string.h>
- #include <ipxe/init.h>
- #include <ipxe/uart.h>
- #include <ipxe/console.h>
- #include <ipxe/serial.h>
- #include <config/console.h>
- #include <config/serial.h>
-
- /* Set default console usage if applicable */
- #if ! ( defined ( CONSOLE_SERIAL ) && CONSOLE_EXPLICIT ( CONSOLE_SERIAL ) )
- #undef CONSOLE_SERIAL
- #define CONSOLE_SERIAL ( CONSOLE_USAGE_ALL & ~CONSOLE_USAGE_LOG )
- #endif
-
- /* UART port number */
- #ifdef COMCONSOLE
- #define CONSOLE_PORT COMCONSOLE
- #else
- #define CONSOLE_PORT 0
- #endif
-
- /* UART baud rate */
- #ifdef COMPRESERVE
- #define CONSOLE_BAUD 0
- #else
- #define CONSOLE_BAUD COMSPEED
- #endif
-
- /* UART line control register value */
- #ifdef COMPRESERVE
- #define CONSOLE_LCR 0
- #else
- #define CONSOLE_LCR UART_LCR_WPS ( COMDATA, COMPARITY, COMSTOP )
- #endif
-
- /** Serial console UART */
- struct uart serial_console;
-
- /**
- * Print a character to serial console
- *
- * @v character Character to be printed
- */
- static void serial_putchar ( int character ) {
-
- /* Do nothing if we have no UART */
- if ( ! serial_console.base )
- return;
-
- /* Transmit character */
- uart_transmit ( &serial_console, character );
- }
-
- /**
- * Get character from serial console
- *
- * @ret character Character read from console
- */
- static int serial_getchar ( void ) {
- uint8_t data;
-
- /* Do nothing if we have no UART */
- if ( ! serial_console.base )
- return 0;
-
- /* Wait for data to be ready */
- while ( ! uart_data_ready ( &serial_console ) ) {}
-
- /* Receive data */
- data = uart_receive ( &serial_console );
-
- /* Strip any high bit and convert DEL to backspace */
- data &= 0x7f;
- if ( data == 0x7f )
- data = 0x08;
-
- return data;
- }
-
- /**
- * Check for character ready to read from serial console
- *
- * @ret True Character available to read
- * @ret False No character available to read
- */
- static int serial_iskey ( void ) {
-
- /* Do nothing if we have no UART */
- if ( ! serial_console.base )
- return 0;
-
- /* Check UART */
- return uart_data_ready ( &serial_console );
- }
-
- /** Serial console */
- struct console_driver serial_console_driver __console_driver = {
- .putchar = serial_putchar,
- .getchar = serial_getchar,
- .iskey = serial_iskey,
- .usage = CONSOLE_SERIAL,
- };
-
- /** Initialise serial console */
- static void serial_init ( void ) {
- int rc;
-
- /* Do nothing if we have no default port */
- if ( ! CONSOLE_PORT )
- return;
-
- /* Select UART */
- if ( ( rc = uart_select ( &serial_console, CONSOLE_PORT ) ) != 0 ) {
- DBG ( "Could not select UART %d: %s\n",
- CONSOLE_PORT, strerror ( rc ) );
- return;
- }
-
- /* Initialise UART */
- if ( ( rc = uart_init ( &serial_console, CONSOLE_BAUD,
- CONSOLE_LCR ) ) != 0 ) {
- DBG ( "Could not initialise UART %d baud %d LCR %#02x: %s\n",
- CONSOLE_PORT, CONSOLE_BAUD, CONSOLE_LCR, strerror ( rc ));
- return;
- }
- }
-
- /**
- * Shut down serial console
- *
- * @v flags Shutdown flags
- */
- static void serial_shutdown ( int flags __unused ) {
-
- /* Do nothing if we have no UART */
- if ( ! serial_console.base )
- return;
-
- /* Flush any pending output */
- uart_flush ( &serial_console );
-
- /* Leave console enabled; it's still usable */
- }
-
- /** Serial console initialisation function */
- struct init_fn serial_console_init_fn __init_fn ( INIT_CONSOLE ) = {
- .initialise = serial_init,
- };
-
- /** Serial console startup function */
- struct startup_fn serial_startup_fn __startup_fn ( STARTUP_EARLY ) = {
- .name = "serial",
- .shutdown = serial_shutdown,
- };
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