264d265d9c
Change-Id: I5484ebb665453777cc3b2561be6e50c787f1a257 Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com> Reviewed-on: http://review.coreboot.org/6209 Tested-by: build bot (Jenkins) Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
61 lines
1.8 KiB
C
61 lines
1.8 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* Copyright (C) 2008-2009 coresystems GmbH
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; version 2 of
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* the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <arch/io.h>
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#include <console/console.h>
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#include <device/pci_ids.h>
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#include <device/pci_def.h>
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#include "pch.h"
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#include "smbus.h"
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void enable_smbus(void)
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{
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device_t dev;
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/* Set the SMBus device statically. */
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dev = PCI_DEV(0x0, 0x1f, 0x3);
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/* Check to make sure we've got the right device. */
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if (pci_read_config16(dev, 0x0) != 0x8086) {
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die("SMBus controller not found!");
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}
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/* Set SMBus I/O base. */
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pci_write_config32(dev, SMB_BASE,
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SMBUS_IO_BASE | PCI_BASE_ADDRESS_SPACE_IO);
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/* Set SMBus enable. */
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pci_write_config8(dev, HOSTC, HST_EN);
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/* Set SMBus I/O space enable. */
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pci_write_config16(dev, PCI_COMMAND, PCI_COMMAND_IO);
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/* Disable interrupt generation. */
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outb(0, SMBUS_IO_BASE + SMBHSTCTL);
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/* Clear any lingering errors, so transactions can run. */
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outb(inb(SMBUS_IO_BASE + SMBHSTSTAT), SMBUS_IO_BASE + SMBHSTSTAT);
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print_debug("SMBus controller enabled.\n");
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}
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int smbus_read_byte(unsigned device, unsigned address)
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{
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return do_smbus_read_byte(SMBUS_IO_BASE, device, address);
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}
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