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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2006 Uwe Hermann <uwe@hermann-uwe.de>
*
* 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/romcc_io.h>
#include "it8718f.h"
/* The base address is 0x2e or 0x4e, depending on config bytes. */
#define SIO_BASE 0x2e
#define SIO_INDEX SIO_BASE
#define SIO_DATA SIO_BASE+1
/* Global configuration registers. */
#define IT8718F_CONFIG_REG_CC 0x02 /* Configure Control (write-only). */
#define IT8718F_CONFIG_REG_LDN 0x07 /* Logical Device Number. */
#define IT8718F_CONFIG_REG_CONFIGSEL 0x22 /* Configuration Select. */
#define IT8718F_CONFIG_REG_CLOCKSEL 0x23 /* Clock Selection. */
#define IT8718F_CONFIG_REG_SWSUSP 0x24 /* Software Suspend, Flash I/F. */
#define IT8718F_CONFIGURATION_PORT 0x2e /* Write-only. */
/* The content of IT8718F_CONFIG_REG_LDN (index 0x07) must be set to the
LDN the register belongs to, before you can access the register. */
static void it8718f_sio_write(uint8_t ldn, uint8_t index, uint8_t value)
{
outb(IT8718F_CONFIG_REG_LDN, SIO_BASE);
outb(ldn, SIO_DATA);
outb(index, SIO_BASE);
outb(value, SIO_DATA);
}
/* Enable the peripheral devices on the IT8718F Super I/O chip. */
static void it8718f_enable_serial(device_t dev, unsigned iobase)
{
/* (1) Enter the configuration state (MB PnP mode). */
/* Perform MB PnP setup to put the SIO chip at 0x2e. */
/* Base address 0x2e: 0x87 0x01 0x55 0x55. */
/* Base address 0x4e: 0x87 0x01 0x55 0xaa. */
outb(0x87, IT8718F_CONFIGURATION_PORT);
outb(0x01, IT8718F_CONFIGURATION_PORT);
outb(0x55, IT8718F_CONFIGURATION_PORT);
outb(0x55, IT8718F_CONFIGURATION_PORT);
/* (2) Modify the data of configuration registers. */
/* Select the chip to configure (if there's more than one).
Set bit 7 to select JP3=1, clear bit 7 to select JP3=0.
If this register is not written, both chips are configured. */
/* it8718f_sio_write(0x00, IT8718F_CONFIG_REG_CONFIGSEL, 0x00); */
/* Enable all devices. */
it8718f_sio_write(IT8718F_SP1, 0x30, 0x1); /* Serial port 1 */
it8718f_sio_write(IT8718F_SP2, 0x30, 0x1); /* Serial port 2 */
/* Select 24MHz CLKIN (set bit 0). */
it8718f_sio_write(0x00, IT8718F_CONFIG_REG_CLOCKSEL, 0x01);
/* Clear software suspend mode (clear bit 0). TODO: Needed? */
/* it8718f_sio_write(0x00, IT8718F_CONFIG_REG_SWSUSP, 0x00); */
/* (3) Exit the configuration state (MB PnP mode). */
it8718f_sio_write(0x00, IT8718F_CONFIG_REG_CC, 0x02);
}
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