blob: dadc5c9a77fa9c11de4bd12b7d4da4020a957fde [file] [log] [blame]
/*
* This file is part of the coreboot project.
*
* Copyright 2018 Google LLC
*
* 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.
*/
#include <arch/io.h>
#include <device/pnp_def.h>
#include <swab.h>
#include "bootblock.h"
#define PNP_CFG_IDX 0x2e
#define PNP_LDN_SERIAL 0x0d
static void pnp_enter_conf_state(pnp_devfn_t dev)
{
outb(0x55, PNP_CFG_IDX);
outb(0x55, PNP_CFG_IDX);
}
static void pnp_exit_conf_state(pnp_devfn_t dev)
{
outb(0xaa, PNP_CFG_IDX);
}
static void wilco_ec_serial_init(void)
{
pnp_devfn_t dev = PNP_DEV(PNP_CFG_IDX, PNP_LDN_SERIAL);
pnp_enter_conf_state(dev);
pnp_set_logical_device(dev);
pnp_set_enable(dev, 1);
pnp_set_iobase(dev, PNP_IDX_IO1, cpu_to_be16(CONFIG_TTYS0_BASE));
pnp_write_config(dev, PNP_IDX_IO0, 1);
pnp_exit_conf_state(dev);
}
void wilco_ec_early_init(void)
{
if (IS_ENABLED(CONFIG_DRIVERS_UART_8250IO))
wilco_ec_serial_init();
}