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Diffstat (limited to 'board/compulab/cm_t35/eeprom.c')
-rw-r--r--board/compulab/cm_t35/eeprom.c130
1 files changed, 130 insertions, 0 deletions
diff --git a/board/compulab/cm_t35/eeprom.c b/board/compulab/cm_t35/eeprom.c
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+++ b/board/compulab/cm_t35/eeprom.c
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+/*
+ * (C) Copyright 2011 CompuLab, Ltd. <www.compulab.co.il>
+ *
+ * Authors: Nikita Kiryanov <nikita@compulab.co.il>
+ * Igor Grinberg <grinberg@compulab.co.il>
+ *
+ * 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; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * 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.
+ */
+
+#include <common.h>
+#include <i2c.h>
+
+#define EEPROM_LAYOUT_VER_OFFSET 44
+#define BOARD_SERIAL_OFFSET 20
+#define BOARD_SERIAL_OFFSET_LEGACY 8
+#define BOARD_REV_OFFSET 0
+#define BOARD_REV_OFFSET_LEGACY 6
+#define BOARD_REV_SIZE 2
+#define MAC_ADDR_OFFSET 4
+#define MAC_ADDR_OFFSET_LEGACY 0
+
+#define LAYOUT_INVALID 0
+#define LAYOUT_LEGACY 0xff
+
+static int eeprom_layout; /* Implicitly LAYOUT_INVALID */
+
+static int cm_t3x_eeprom_read(uint offset, uchar *buf, int len)
+{
+ return i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, offset,
+ CONFIG_SYS_I2C_EEPROM_ADDR_LEN, buf, len);
+}
+
+static int eeprom_setup_layout(void)
+{
+ int res;
+
+ if (eeprom_layout != LAYOUT_INVALID)
+ return 0;
+
+ res = cm_t3x_eeprom_read(EEPROM_LAYOUT_VER_OFFSET,
+ (uchar *)&eeprom_layout, 1);
+ if (res) {
+ eeprom_layout = LAYOUT_INVALID;
+ return res;
+ }
+
+ if (eeprom_layout == 0 || eeprom_layout >= 0x20)
+ eeprom_layout = LAYOUT_LEGACY;
+
+ return 0;
+}
+
+void get_board_serial(struct tag_serialnr *serialnr)
+{
+ u32 serial[2];
+ uint offset;
+
+ memset(serialnr, 0, sizeof(*serialnr));
+ if (eeprom_setup_layout())
+ return;
+
+ offset = (eeprom_layout != LAYOUT_LEGACY) ?
+ BOARD_SERIAL_OFFSET : BOARD_SERIAL_OFFSET_LEGACY;
+ if (cm_t3x_eeprom_read(offset, (uchar *)serial, 8))
+ return;
+
+ if (serial[0] != 0xffffffff && serial[1] != 0xffffffff) {
+ serialnr->low = serial[0];
+ serialnr->high = serial[1];
+ }
+}
+
+/*
+ * Routine: cm_t3x_eeprom_read_mac_addr
+ * Description: read mac address and store it in buf.
+ */
+int cm_t3x_eeprom_read_mac_addr(uchar *buf)
+{
+ uint offset;
+
+ if (eeprom_setup_layout())
+ return 0;
+
+ offset = (eeprom_layout != LAYOUT_LEGACY) ?
+ MAC_ADDR_OFFSET : MAC_ADDR_OFFSET_LEGACY;
+ return cm_t3x_eeprom_read(offset, buf, 6);
+}
+
+/*
+ * Routine: cm_t3x_eeprom_get_board_rev
+ * Description: read system revision from eeprom
+ */
+u32 cm_t3x_eeprom_get_board_rev(void)
+{
+ u32 rev = 0;
+ char str[5]; /* Legacy representation can contain at most 4 digits */
+ uint offset = BOARD_REV_OFFSET_LEGACY;
+
+ if (eeprom_setup_layout())
+ return 0;
+
+ if (eeprom_layout != LAYOUT_LEGACY)
+ offset = BOARD_REV_OFFSET;
+
+ if (cm_t3x_eeprom_read(offset, (uchar *)&rev, BOARD_REV_SIZE))
+ return 0;
+
+ /*
+ * Convert legacy syntactic representation to semantic
+ * representation. i.e. for rev 1.00: 0x100 --> 0x64
+ */
+ if (eeprom_layout == LAYOUT_LEGACY) {
+ sprintf(str, "%x", rev);
+ rev = simple_strtoul(str, NULL, 10);
+ }
+
+ return rev;
+};