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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2013 Red Hat Inc.
* Written by Gerd Hoffmann <kraxel@redhat.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; version 2 of the License.
*
* 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 <console/console.h>
#include <arch/io.h>
static unsigned char readback;
static void debugcon_init(void)
{
readback = inb(CONFIG_CONSOLE_QEMU_DEBUGCON_PORT);
printk(BIOS_INFO, "QEMU debugcon %s [port 0x%x]\n",
(readback == 0xe9) ? "detected" : "not found",
CONFIG_CONSOLE_QEMU_DEBUGCON_PORT);
}
static void debugcon_tx_byte(unsigned char data)
{
if (readback == 0xe9) {
outb(data, CONFIG_CONSOLE_QEMU_DEBUGCON_PORT);
}
}
static void debugcon_tx_flush(void)
{
}
static unsigned char debugcon_rx_byte(void)
{
return 0;
}
static int debugcon_tst_byte(void)
{
return 0;
}
static const struct console_driver debugcon_console __console = {
.init = debugcon_init,
.tx_byte = debugcon_tx_byte,
.tx_flush = debugcon_tx_flush,
.rx_byte = debugcon_rx_byte,
.tst_byte = debugcon_tst_byte,
};
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