From 62adc4c6101749d59bdcc36135556fc2d2482131 Mon Sep 17 00:00:00 2001 From: Vladimir Serbinenko Date: Thu, 23 Jan 2014 09:06:08 +0100 Subject: lenovo: Handle EEPROM/RFID chip. EEPROM/RFID chip present in thinkpad should be locked in a way to avoid any potential RFID access. Read serial number, UUID and P/N from EEPROM. This info is stored on AT24RF08 chip acessible through SMBUS. Change-Id: Ia3e766d90a094f63c8c854cd37e165221ccd8acd Signed-off-by: Vladimir Serbinenko Reviewed-on: http://review.coreboot.org/4774 Tested-by: build bot (Jenkins) Reviewed-by: Rudolf Marek --- src/drivers/i2c/at24rf08c/lenovo_serials.c | 137 +++++++++++++++++++++++++++++ 1 file changed, 137 insertions(+) create mode 100644 src/drivers/i2c/at24rf08c/lenovo_serials.c (limited to 'src/drivers/i2c/at24rf08c/lenovo_serials.c') diff --git a/src/drivers/i2c/at24rf08c/lenovo_serials.c b/src/drivers/i2c/at24rf08c/lenovo_serials.c new file mode 100644 index 0000000000..0aab982123 --- /dev/null +++ b/src/drivers/i2c/at24rf08c/lenovo_serials.c @@ -0,0 +1,137 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2013 Vladimir Serbinenko + * + * 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; version 2 of the License. + * + * 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 +#include +#include +#include +#include +#include +#include + +static void at24rf08c_read_string(u8 bank, u8 start, u8 len, char *result) +{ + int i; + device_t dev; + + dev = dev_find_slot_on_smbus(1, 0x54 | bank); + if (dev == 0) { + printk(BIOS_WARNING, "EEPROM not found\n"); + memcpy(result, "*INVALID*", sizeof ("*INVALID*")); + return; + } + + for (i = 0; i < len; i++) { + int t; + int j; + /* After a register write AT24RF08C (which we issued in init function) sometimes stops responding. + Retry several times in case of failure. + */ + for (j = 0; j < 100; j++) { + t = smbus_read_byte(dev, start + i); + if (t >= 0) + break; + } + if (t < 0x20 || t > 0x7f) { + memcpy(result, "*INVALID*", sizeof ("*INVALID*")); + return; + } + result[i] = t; + } +} + +const char *smbios_mainboard_serial_number(void) +{ + static char result[12]; + static int already_read; + + if (already_read) + return result; + + memset(result, 0, sizeof (result)); + at24rf08c_read_string(0, 0x2e, 7, result); + + already_read = 1; + return result; +} + +const char *smbios_mainboard_product_name(void) +{ + static char result[12]; + static int already_read; + + if (already_read) + return result; + + memset (result, 0, sizeof (result)); + at24rf08c_read_string(0, 0x27, 7, result); + + already_read = 1; + return result; +} + +void smbios_mainboard_set_uuid(u8 *uuid) +{ + static char result[16]; + unsigned i; + static int already_read; + device_t dev; + const int remap[16] = { + /* UUID byteswap. */ + 3, 2, 1, 0, 5, 4, 7, 6, 8, 9, 10, 11, 12, 13, 14, 15 + }; + + + if (already_read) { + memcpy (uuid, result, 16); + return; + } + + memset (result, 0, sizeof (result)); + + dev = dev_find_slot_on_smbus(1, 0x56); + if (dev == 0) { + printk(BIOS_WARNING, "eeprom not found\n"); + already_read = 1; + memset (uuid, 0, 16); + return; + } + + for (i = 0; i < 16; i++) { + int t; + int j; + /* After a register write AT24RF08C (which we issued in init function) sometimes stops responding. + Retry several times in case of failure. + */ + for (j = 0; j < 100; j++) { + t = smbus_read_byte(dev, 0x12 + i); + if (t >= 0) + break; + } + if (t < 0) { + memset (result, 0, sizeof (result)); + break; + } + result[remap[i]] = t; + } + + already_read = 1; + + memcpy (uuid, result, 16); +} -- cgit v1.2.3