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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2006 Uwe Hermann <uwe@hermann-uwe.de>
* Copyright (C) 2011 QingPei Wang <wangqingpei@gmail.com>
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <arch/io.h>
#include <device/pnp.h>
#include <stdint.h>
#include "it8721f.h"
/* Global configuration registers. */
#define IT8721F_CONFIG_REG_CC 0x02 /* Configure Control (write-only). */
#define IT8721F_CONFIG_REG_LDN 0x07 /* Logical Device Number. */
#define IT8721F_CONFIG_REG_CLOCKSEL 0x23 /* Clock Selection. */
#define IT8721F_CONFIG_REG_SWSUSP 0x24 /* Software Suspend, Flash I/F. */
static void it8721f_sio_write(device_t dev, u8 index, u8 value)
{
pnp_set_logical_device(dev);
pnp_write_config(dev, index, value);
}
static void it8721f_enter_conf(device_t dev)
{
u16 port = dev >> 8;
outb(0x87, port);
outb(0x01, port);
outb(0x55, port);
outb((port == 0x4e) ? 0xaa : 0x55, port);
}
static void it8721f_exit_conf(device_t dev)
{
it8721f_sio_write(dev, IT8721F_CONFIG_REG_CC, 0x02);
}
static void it8721f_reg_write(device_t dev, u8 index, u8 value)
{
it8721f_enter_conf(dev);
it8721f_sio_write(dev, index, value);
it8721f_exit_conf(dev);
}
/*
* in romstage.c
* #define CLKIN_DEV PNP_DEV(0x2e, IT8721F_GPIO)
* and pass: CLKIN_DEV
* IT8721F_UART_CLK_PREDIVIDE_24
* IT8721F_UART_CLK_PREDIVIDE_48 (default)
*/
void it8721f_conf_clkin(device_t dev, u8 predivide)
{
it8721f_reg_write(dev, IT8721F_CONFIG_REG_CLOCKSEL, (0x1 & predivide));
}
/* Enable the serial port(s). */
void it8721f_enable_serial(device_t dev, u16 iobase)
{
it8721f_enter_conf(dev);
pnp_set_logical_device(dev);
pnp_set_enable(dev, 0);
pnp_set_iobase(dev, PNP_IDX_IO0, iobase);
pnp_set_enable(dev, 1);
it8721f_exit_conf(dev);
}
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