| /* |
| * 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); |
| } |