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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2006-2007 Uwe Hermann <uwe@hermann-uwe.de>
* Copyright (C) 2007 Corey Osgood <corey_osgood@verizon.net>
*
* 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.
*/
/* This has been ported to the VIA VT82C686(A/B) from the SMSC FDC37M60x
* by Corey Osgood. See vt82c686.h for more information. */
#include <arch/io.h>
#include <device/pci_ids.h>
#include "vt82c686.h"
#define SIO_INDEX 0x3f0
#define SIO_DATA 0x3f1
/**
* Configure the chip by writing the byte 'value' into the register
* specified by 'index'.
*
* @param index The index of the register to modify.
* @param value The value to write into the register.
*/
static void vt82c686_sio_write(uint8_t index, uint8_t value)
{
outb(index, SIO_INDEX);
outb(value, SIO_DATA);
}
/**
* Enable the serial port(s) of the VT82C686(A/B) Super I/O chip.
*
* @param dev TODO
* @param iobase TODO
*/
static void vt82c686_enable_serial(device_t dev, unsigned iobase)
{
uint8_t reg;
device_t sbdev;
/* TODO: Use info from 'dev' and 'iobase'. */
/* TODO: Only enable one serial port (depending on config) or both? */
/* (1) Enter configuration mode (set Function 0 Rx85[1] = 1). */
/* Find the southbridge. Die upon error. */
sbdev = pci_locate_device(PCI_ID(PCI_VENDOR_ID_VIA,
PCI_DEVICE_ID_VIA_82C686), 0);
// sbdev = PCI_DEV(0, 7, 0);
if (sbdev == PCI_DEV_INVALID) {
/* Serial output is not yet working at this point, but
* die() emits the POST code 0xff and halts the CPU, too. */
die("Southbridge not found.\n");
}
/* Enable Super-I/O (bit 0) and Super-I/O Configuration (bit 1). */
reg = pci_read_config8(sbdev, 0x85);
pci_write_config8(sbdev, 0x85, reg | 0x3); /* Set bits 0 and 1. */
/* (2) Configure the chip. */
/* Enable serial port 1 (set bit 2) and 2 (set bit 3). */
vt82c686_sio_write(VT82C686_FS, 0xf);
// vt82c686_sio_write(VT82C686_POWER, 0x00); /* No powerdown */
// vt82c686_sio_write(VT82C686_SP_CTRL, 0x00); /* Normal operation */
vt82c686_sio_write(VT82C686_SP1, 0xfe); /* SP1: 0x3f8 */
vt82c686_sio_write(VT82C686_SP2, 0xbe); /* SP2: 0x2f8 */
/* Enable high speed on serial port 1 (set bit 6) and 2 (set bit 7). */
vt82c686_sio_write(VT82C686_SP_CFG, 0xc0);
/* (3) Exit configuration mode (set Function 0 Rx85[1] = 0). */
reg = pci_read_config8(sbdev, 0x85);
pci_write_config8(sbdev, 0x85, reg & 0xfd); /* Clear bit 1. */
}
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