123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869 |
- /*
- * 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
- *
- * 16550-compatible UART
- *
- */
-
- #include <errno.h>
- #include <ipxe/uart.h>
-
- /** UART port bases */
- static uint16_t uart_base[] = {
- [COM1] = 0x3f8,
- [COM2] = 0x2f8,
- [COM3] = 0x3e8,
- [COM4] = 0x2e8,
- };
-
- /**
- * Select UART port
- *
- * @v uart UART
- * @v port Port number, or 0 to disable
- * @ret rc Return status code
- */
- int uart_select ( struct uart *uart, unsigned int port ) {
- int rc;
-
- /* Set new UART base */
- if ( port >= ( sizeof ( uart_base ) / sizeof ( uart_base[0] ) ) ) {
- rc = -ENODEV;
- goto err;
- }
- uart->base = ( ( void * ) ( intptr_t ) uart_base[port] );
-
- /* Check that UART exists */
- if ( ( rc = uart_exists ( uart ) ) != 0 )
- goto err;
-
- return 0;
-
- err:
- uart->base = NULL;
- return rc;
- }
|