drivers/secunet: Add driver to read DMI info from I2C EEPROM

The EEPROM layout is rather arbitrary and /just happened/. It needs a
256kbit part at least.

Change-Id: Iae5c9138e8404acfc3a43dc2c7b55d47d4147060
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36298
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 109 insertions, 0 deletions

diff --git a/src/drivers/secunet/dmi/smbios.c b/src/drivers/secunet/dmi/smbios.c
new file mode 100644
index 0000000000..5dfbb5d8b7
--- /dev/null
+++ b/src/drivers/secunet/dmi/smbios.c
@@ -0,0 +1,109 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2017 secunet Security Networks AG
+ *
+ * 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.
+ */
+
+#include <stdint.h>
+#include <string.h>
+#include <ctype.h>
+#include <commonlib/helpers.h>
+#include <uuid.h>
+#include <console/console.h>
+#include <device/device.h>
+#include <device/i2c_bus.h>
+#include <smbios.h>
+
+#include "eeprom.h"
+
+#define MAX_STRING_LENGTH UUID_STRLEN
+
+static struct device *eeprom;
+
+static const char *eeprom_read_string(const enum bx26_strings idx)
+{
+	static char str[MAX_STRING_LENGTH + 1];
+
+	if (!eeprom) {
+		printk(BIOS_WARNING, "DMI: Serial EEPROM not found\n");
+		str[0] = '\0';
+		return str;
+	}
+
+	const size_t offset = bx26_locations[idx].offset;
+	const size_t length = MIN(bx26_locations[idx].length, MAX_STRING_LENGTH);
+
+	if (i2c_dev_read_at16(eeprom, (u8 *)str, length, offset) != length) {
+		printk(BIOS_WARNING, "DMI: Failed to read serial EEPROM\n");
+		str[0] = '\0';
+	} else {
+		unsigned int i;
+		/* Terminate at first non-printable character. */
+		for (i = 0; i < length; ++i) {
+			if (!isprint(str[i]))
+				break;
+		}
+		str[i] = '\0';
+	}
+
+	return str;
+}
+
+const char *smbios_system_manufacturer(void)
+{
+	return eeprom_read_string(SYSTEM_MANUFACTURER);
+}
+
+const char *smbios_system_product_name(void)
+{
+	return eeprom_read_string(SYSTEM_PRODUCT_NAME);
+}
+
+const char *smbios_system_serial_number(void)
+{
+	return eeprom_read_string(SYSTEM_SERIAL_NUMBER);
+}
+
+const char *smbios_system_version(void)
+{
+	return eeprom_read_string(SYSTEM_VERSION);
+}
+
+void smbios_system_set_uuid(u8 *const uuid)
+{
+	if (parse_uuid(uuid, eeprom_read_string(SYSTEM_UUID))) {
+		printk(BIOS_WARNING, "DMI: Cannot parse UUID\n");
+		memset(uuid, 0x00, UUID_LEN);
+	}
+}
+
+const char *smbios_mainboard_serial_number(void)
+{
+	return eeprom_read_string(BOARD_SERIAL_NUMBER);
+}
+
+const char *smbios_mainboard_version(void)
+{
+	return eeprom_read_string(BOARD_VERSION);
+}
+
+static void enable_dev(struct device *dev)
+{
+	if (dev->path.type != DEVICE_PATH_I2C || (dev->path.i2c.device & 0xf0) != 0x50)
+		return;
+	eeprom = dev;
+}
+
+struct chip_operations drivers_secunet_dmi_ops = {
+	CHIP_NAME("secunet DMI")
+	.enable_dev = enable_dev,
+};