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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2007-2009 coresystems GmbH
*
* 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.
*/
/*
* Enable the serial devices on the VIA CX700
*/
#include <arch/io.h>
static void cx700_writepnpaddr(u8 val)
{
outb(val, 0x2e);
outb(val, 0xeb);
}
static void cx700_writepnpdata(u8 val)
{
outb(val, 0x2f);
outb(val, 0xeb);
}
static void cx700_writesiobyte(u16 reg, u8 val)
{
outb(val, reg);
}
static void cx700_writesioword(u16 reg, u16 val)
{
outw(val, reg);
}
static void enable_cx700_serial(void)
{
post_code(0x06);
// WTH?
outb(0x03, 0x22);
// Set UART1 I/O Base Address
pci_write_config8(PCI_DEV(0, 17, 0), 0xb4, 0x7e);
// UART1 Enable
pci_write_config8(PCI_DEV(0, 17, 0), 0xb0, 0x10);
// turn on pnp
cx700_writepnpaddr(0x87);
cx700_writepnpaddr(0x87);
// now go ahead and set up com1.
// set address
cx700_writepnpaddr(0x7);
cx700_writepnpdata(0x2);
// enable serial out
cx700_writepnpaddr(0x30);
cx700_writepnpdata(0x1);
// serial port 1 base address (FEh)
cx700_writepnpaddr(0x60);
cx700_writepnpdata(0xfe);
// serial port 1 IRQ (04h)
cx700_writepnpaddr(0x70);
cx700_writepnpdata(0x4);
// serial port 1 control
cx700_writepnpaddr(0xf0);
cx700_writepnpdata(0x2);
// turn of pnp
cx700_writepnpaddr(0xaa);
// XXX This part should be fully taken care of by
// src/lib/uart8250.c:uart_init
// set up reg to set baud rate.
cx700_writesiobyte(0x3fb, 0x80);
// Set 115 kb
cx700_writesioword(0x3f8, 1);
// Set 9.6 kb
// cx700_writesioword(0x3f8, 12)
// now set no parity, one stop, 8 bits
cx700_writesiobyte(0x3fb, 3);
// now turn on RTS, DRT
cx700_writesiobyte(0x3fc, 3);
// Enable interrupts
cx700_writesiobyte(0x3f9, 0xf);
// should be done. Dump a char for fun.
cx700_writesiobyte(0x3f8, 48);
post_code(0x07);
}
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