2 * This file is part of the coreboot project.
4 * Copyright (C) 2007 Uwe Hermann <uwe@hermann-uwe.de>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21 #include <arch/romcc_io.h>
22 #include <device/pnp_def.h>
24 /* All known/supported SMSC Super I/Os have the same logical device IDs
25 * for the serial ports (COM1, COM2).
27 #define SMSCSUPERIO_SP1 4 /* Com1 */
28 #define SMSCSUPERIO_SP2 5 /* Com2 */
31 * Enable the specified serial port.
33 * @param dev The device to use.
34 * @param iobase The I/O base of the serial port (usually 0x3f8/0x2f8).
36 static inline void smscsuperio_enable_serial(device_t dev, uint16_t iobase)
38 uint16_t port = dev >> 8;
40 outb(0x55, port); /* Enter the configuration state. */
41 pnp_set_logical_device(dev);
42 pnp_set_enable(dev, 0);
43 pnp_set_iobase(dev, PNP_IDX_IO0, iobase);
44 pnp_set_enable(dev, 1);
45 outb(0xaa, port); /* Exit the configuration state. */