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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2007 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.
*/
#include <stdint.h>
#include <arch/io.h>
#include <console/console.h>
#include <device/pci_ids.h>
#include <device/pci_def.h>
#include "i82371eb.h"
#include "smbus.h"
void enable_smbus(void)
{
device_t dev;
u8 reg8;
u16 reg16;
/* Get the SMBus/PM device of the 82371AB/EB/MB. */
dev = pci_locate_device(PCI_ID(PCI_VENDOR_ID_INTEL,
PCI_DEVICE_ID_INTEL_82371AB_SMB_ACPI), 0);
/* Set the SMBus I/O base. */
pci_write_config32(dev, SMBBA, SMBUS_IO_BASE | 1);
/* Enable the SMBus controller host interface. */
reg8 = pci_read_config8(dev, SMBHSTCFG);
reg8 |= SMB_HST_EN;
pci_write_config8(dev, SMBHSTCFG, reg8);
/* Enable access to the SMBus I/O space. */
reg16 = pci_read_config16(dev, PCI_COMMAND);
reg16 |= PCI_COMMAND_IO;
pci_write_config16(dev, PCI_COMMAND, reg16);
/* Clear any lingering errors, so the transaction will run. */
outb(inb(SMBUS_IO_BASE + SMBHST_STATUS), SMBUS_IO_BASE + SMBHST_STATUS);
}
int smbus_read_byte(u8 device, u8 address)
{
return do_smbus_read_byte(SMBUS_IO_BASE, device, address);
}
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