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/*
* 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>
/* 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;
}
/* 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,
};
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