/* * This file is part of the coreboot project. * * Copyright (C) 2012 Bachmann electronic GmbH * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * 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. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ #include <device/device.h> #include <device/smbus.h> #include <smbios.h> #include <console/console.h> #include <cpu/x86/msr.h> #include <arch/io.h> /* overwrite a weak function to fill SMBIOS table with a custom value */ static u8 hw_rev = 0; static char mb_rev_str[2] = { '0' }; const char *smbios_mainboard_version(void) { /* UDMA is not working on all supported devices */ if (hw_rev < 113) { mb_rev_str[0] = '1'; } else { mb_rev_str[0] = '2'; } return mb_rev_str; } static void init(struct device *dev) { unsigned int i; u32 chksum = 0; char block[20]; msr_t reset; device_t eeprom_dev = dev_find_slot_on_smbus(1, 0x52); if (eeprom_dev == 0) { printk(BIOS_WARNING, "eeprom not found\n"); return; } /* turn off all leds except led_ini */ outb(0x02, 0x5a); /* bit0 - led_run */ /* bit1 - led_ini */ /* bit2 - led_err */ /* bit3-bit7 - write has no effect */ outb(0x00, 0x49); /* bit0-bit6 - led_7-led_1 */ /* bit7 - write has no effect */ /* read the whole block and check if checksum is okay */ for (i = 0; i < 20; i++) { block[i] = smbus_read_byte(eeprom_dev, i); chksum += block[i]; } if (chksum != 0) { printk(BIOS_WARNING, "wrong checksum: 0x%0x\n", chksum); } hw_rev = block[5]; printk(BIOS_DEBUG, "hw revision: %u\n", hw_rev); /* Reset MFGPT7 (standby power domain) - this is done via * an undocumented register */ reset = rdmsr(0x5140002b); reset.lo |= 1 << 7; wrmsr(0x5140002b, reset); } static void mainboard_enable(struct device *dev) { dev->ops->init = init; } struct chip_operations mainboard_ops = { .enable_dev = mainboard_enable, };