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 <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/4774
Tested-by: build bot (Jenkins)
Reviewed-by: Rudolf Marek <r.marek@assembler.cz>

1 files changed, 74 insertions, 0 deletions

diff --git a/src/drivers/i2c/at24rf08c/at24rf08c.c b/src/drivers/i2c/at24rf08c/at24rf08c.c
new file mode 100644
index 0000000000..a9cf2c5031
--- /dev/null
+++ b/src/drivers/i2c/at24rf08c/at24rf08c.c
@@ -0,0 +1,74 @@
+/*
+ * 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 <types.h>
+#include <string.h>
+#include <arch/io.h>
+#include <device/device.h>
+#include <device/smbus.h>
+#include <smbios.h>
+#include <console/console.h>
+
+static void at24rf08c_init(device_t dev)
+{
+	int i, j;
+
+	if (!dev->enabled)
+		return;
+
+        /* Ensure that EEPROM/RFID chip is not accessible through RFID.
+	   Need to do it only on 5c.  */
+	if (dev->path.type != DEVICE_PATH_I2C || dev->path.i2c.device != 0x5c)
+		return;
+
+	printk (BIOS_DEBUG, "Locking EEPROM RFID\n");
+
+	for (i = 0; i < 8; i++)
+	{
+		/* After a register write AT24RF08C sometimes stops responding.
+		   Retry several times in case of failure.
+		 */
+		for (j = 0; j < 100; j++)
+			if (smbus_write_byte(dev, i, 0x0f) >= 0)
+				break;
+	}
+
+	printk (BIOS_DEBUG, "init EEPROM done\n");
+}
+
+static void at24rf08c_noop(device_t dummy)
+{
+}
+
+static struct device_operations at24rf08c_operations = {
+	.read_resources = at24rf08c_noop,
+	.set_resources = at24rf08c_noop,
+	.enable_resources = at24rf08c_noop,
+	.init = at24rf08c_init,
+};
+
+static void enable_dev(device_t dev)
+{
+	dev->ops = &at24rf08c_operations;
+}
+
+struct chip_operations drivers_i2c_at24rf08c_ops = {
+	CHIP_NAME("AT24RF08C")
+	.enable_dev = enable_dev,
+};