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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2007 Uwe Hermann <uwe@hermann-uwe.de>
* Copyright (C) 2014 Edward O'Callaghan <eocallaghan@alterapraxis.com>
*
* 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.
*/
#include <arch/io.h>
#include <device/pnp_def.h>
#include <stdint.h>
#include "smscsuperio.h"
#define SMSC_ENTRY_KEY 0x55
#define SMSC_EXIT_KEY 0xAA
/* Enable configuration: pass entry key '0x87' into index port dev. */
static void pnp_enter_conf_state(pnp_devfn_t dev)
{
u16 port = dev >> 8;
outb(SMSC_ENTRY_KEY, port);
}
/* Disable configuration: pass exit key '0xAA' into index port dev. */
static void pnp_exit_conf_state(pnp_devfn_t dev)
{
u16 port = dev >> 8;
outb(SMSC_EXIT_KEY, port);
}
/**
* Enable the specified serial port.
*
* @param dev The device to use.
* @param iobase The I/O base of the serial port (usually 0x3f8/0x2f8).
*/
void smscsuperio_enable_serial(pnp_devfn_t dev, u16 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);
}
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