/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2005 Digital Design Corporation
 *
 * 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
 */

/* Pre-RAM driver for SMSC LPC47B272 Super I/O chip. */

#include <arch/romcc_io.h>
#include "lpc47b272.h"

/*
 * Function:    	pnp_enter_conf_state
 * Parameters:  	dev - high 8 bits = Super I/O port
 * Return Value:	None
 * Description: 	Enable access to the LPC47B272's configuration registers.
 */
static inline void pnp_enter_conf_state(device_t dev)
{
	unsigned port = dev>>8;
	outb(0x55, port);
}

/*
 * Function:    	pnp_exit_conf_state
 * Parameters:  	dev - high 8 bits = Super I/O port
 * Return Value:	None
 * Description: 	Disable access to the LPC47B272's configuration registers.
 */
static void pnp_exit_conf_state(device_t dev)
{
	unsigned port = dev>>8;
	outb(0xaa, port);
}

/*
 * Function:    	lpc47b272_enable_serial
 * Parameters:  	dev - high 8 bits = Super I/O port,
 *			      low 8 bits = logical device number (per lpc47b272.h)
 *			iobase - processor I/O port address to assign to this serial device
 * Return Value:	bool
 * Description: 	Configure the base I/O port of the specified serial device
 *			and enable the serial device.
 */
static void lpc47b272_enable_serial(device_t dev, unsigned iobase)
{
	pnp_enter_conf_state(dev);
	pnp_set_logical_device(dev);
	pnp_set_enable(dev, 0);
	pnp_set_iobase(dev, PNP_IDX_IO0, iobase);
	pnp_set_enable(dev, 1);
	pnp_exit_conf_state(dev);
}