diff options
Diffstat (limited to 'src/superio/smsc/smscsuperio/early_serial.c')
-rw-r--r-- | src/superio/smsc/smscsuperio/early_serial.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/src/superio/smsc/smscsuperio/early_serial.c b/src/superio/smsc/smscsuperio/early_serial.c new file mode 100644 index 0000000000..281a35c861 --- /dev/null +++ b/src/superio/smsc/smscsuperio/early_serial.c @@ -0,0 +1,46 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2007 Uwe Hermann <uwe@hermann-uwe.de> + * + * 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 + * (at your option) 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 St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <arch/romcc_io.h> +#include <device/pnp_def.h> + +/* All known/supported SMSC Super I/Os have the same logical device IDs + * for the serial ports (COM1, COM2). + */ +#define SMSCSUPERIO_SP1 4 /* Com1 */ +#define SMSCSUPERIO_SP2 5 /* Com2 */ + +/** + * Enable the specified serial port. + * + * @param dev The device to use. + * @param iobase The I/O base of the serial port (usually 0x3f8/0x2f8). + */ +static inline void smscsuperio_enable_serial(device_t dev, u16 iobase) +{ + u16 port = dev >> 8; + + outb(0x55, port); /* Enter the configuration state. */ + pnp_set_logical_device(dev); + pnp_set_enable(dev, 0); + pnp_set_iobase(dev, PNP_IDX_IO0, iobase); + pnp_set_enable(dev, 1); + outb(0xaa, port); /* Exit the configuration state. */ +} |