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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2005 Tyan Computer
* (Written by Yinghai Lu <yinghailu@gmail.com> for Tyan Computer)
* Copyright (C) 2007 Corey Osgood <corey.osgood@gmail.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.
*/
#include <arch/io.h>
#include <console/console.h>
#include <device/pci_ids.h>
#include <device/pci_def.h>
#include "i82801ax.h"
#include "smbus.h"
void enable_smbus(void)
{
pci_devfn_t dev;
/* Set the SMBus device statically (D31:F3). */
dev = PCI_DEV(0x0, 0x1f, 0x3);
/* Set SMBus I/O base. */
pci_write_config32(dev, SMB_BASE,
SMBUS_IO_BASE | PCI_BASE_ADDRESS_SPACE_IO);
/* Set SMBus enable. */
pci_write_config8(dev, HOSTC, HST_EN);
/* Set SMBus I/O space enable. */
pci_write_config16(dev, PCI_COMMAND, PCI_COMMAND_IO);
/* Disable interrupt generation. */
outb(0, SMBUS_IO_BASE + SMBHSTCTL);
/* Clear any lingering errors, so transactions can run. */
outb(inb(SMBUS_IO_BASE + SMBHSTSTAT), SMBUS_IO_BASE + SMBHSTSTAT);
printk(BIOS_DEBUG, "SMBus controller enabled\n");
}
int smbus_read_byte(u8 device, u8 address)
{
return do_smbus_read_byte(SMBUS_IO_BASE, device, address);
}
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