Uwe Hermann | 1410c2d | 2007-05-29 10:37:52 +0000 | [diff] [blame] | 1 | /* |
Stefan Reinauer | 7e61e45 | 2008-01-18 10:35:56 +0000 | [diff] [blame^] | 2 | * This file is part of the coreboot project. |
Uwe Hermann | 1410c2d | 2007-05-29 10:37:52 +0000 | [diff] [blame] | 3 | * |
| 4 | * Copyright (C) 2007 Uwe Hermann <uwe@hermann-uwe.de> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 19 | */ |
| 20 | |
| 21 | /* TODO: Implement smbus_write_byte(), smbus_recv_byte(), smbus_send_byte(). */ |
| 22 | |
Uwe Hermann | 9da69f8 | 2007-11-30 02:08:26 +0000 | [diff] [blame] | 23 | #include <stdint.h> |
Uwe Hermann | 1410c2d | 2007-05-29 10:37:52 +0000 | [diff] [blame] | 24 | #include <device/pci_ids.h> |
| 25 | #include "i82371eb.h" |
Stefan Reinauer | a14b468 | 2006-08-04 07:50:59 +0000 | [diff] [blame] | 26 | #include "i82371eb_smbus.h" |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 27 | |
| 28 | #define SMBUS_IO_BASE 0x0f00 |
| 29 | |
| 30 | static void enable_smbus(void) |
| 31 | { |
| 32 | device_t dev; |
Uwe Hermann | 9da69f8 | 2007-11-30 02:08:26 +0000 | [diff] [blame] | 33 | u8 reg8; |
| 34 | u16 reg16; |
Uwe Hermann | 1410c2d | 2007-05-29 10:37:52 +0000 | [diff] [blame] | 35 | |
Uwe Hermann | 9da69f8 | 2007-11-30 02:08:26 +0000 | [diff] [blame] | 36 | /* Check for SMBus device PCI ID on the 82371AB/EB/MB. */ |
Uwe Hermann | 1410c2d | 2007-05-29 10:37:52 +0000 | [diff] [blame] | 37 | dev = pci_locate_device(PCI_ID(PCI_VENDOR_ID_INTEL, |
Uwe Hermann | 447aafe | 2007-11-29 01:44:43 +0000 | [diff] [blame] | 38 | PCI_DEVICE_ID_INTEL_82371AB_SMB_ACPI), 0); |
Uwe Hermann | 1410c2d | 2007-05-29 10:37:52 +0000 | [diff] [blame] | 39 | |
Uwe Hermann | 9da69f8 | 2007-11-30 02:08:26 +0000 | [diff] [blame] | 40 | if (dev == PCI_DEV_INVALID) |
Uwe Hermann | 1410c2d | 2007-05-29 10:37:52 +0000 | [diff] [blame] | 41 | die("SMBus controller not found\r\n"); |
Uwe Hermann | 9da69f8 | 2007-11-30 02:08:26 +0000 | [diff] [blame] | 42 | |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 43 | print_spew("SMBus controller enabled\r\n"); |
Uwe Hermann | 1410c2d | 2007-05-29 10:37:52 +0000 | [diff] [blame] | 44 | |
| 45 | /* Set the SMBus I/O base. */ |
| 46 | pci_write_config32(dev, SMBBA, SMBUS_IO_BASE | 1); |
| 47 | |
Uwe Hermann | 9da69f8 | 2007-11-30 02:08:26 +0000 | [diff] [blame] | 48 | /* Enable the SMBus controller host interface. */ |
Uwe Hermann | 1410c2d | 2007-05-29 10:37:52 +0000 | [diff] [blame] | 49 | reg8 = pci_read_config8(dev, SMBHSTCFG); |
| 50 | reg8 |= SMB_HST_EN; |
| 51 | pci_write_config8(dev, SMBHSTCFG, reg8); |
| 52 | |
| 53 | /* Enable access to the SMBus I/O space. */ |
Uwe Hermann | 56a9125 | 2007-06-03 16:57:27 +0000 | [diff] [blame] | 54 | reg16 = pci_read_config16(dev, PCI_COMMAND); |
Uwe Hermann | 9da69f8 | 2007-11-30 02:08:26 +0000 | [diff] [blame] | 55 | reg16 |= PCI_COMMAND_IO; |
Uwe Hermann | 56a9125 | 2007-06-03 16:57:27 +0000 | [diff] [blame] | 56 | pci_write_config16(dev, PCI_COMMAND, reg16); |
Uwe Hermann | 1410c2d | 2007-05-29 10:37:52 +0000 | [diff] [blame] | 57 | |
| 58 | /* Clear any lingering errors, so the transaction will run. */ |
| 59 | outb(inb(SMBUS_IO_BASE + SMBHST_STATUS), SMBUS_IO_BASE + SMBHST_STATUS); |
Richard Smith | d7088c4 | 2006-07-30 00:23:20 +0000 | [diff] [blame] | 60 | } |
| 61 | |
Uwe Hermann | 9da69f8 | 2007-11-30 02:08:26 +0000 | [diff] [blame] | 62 | static int smbus_read_byte(u8 device, u8 address) |
Richard Smith | d7088c4 | 2006-07-30 00:23:20 +0000 | [diff] [blame] | 63 | { |
| 64 | return do_smbus_read_byte(SMBUS_IO_BASE, device, address); |
| 65 | } |