From: Nikita Kiryanov <nik...@compulab.co.il>
Add board specific EEPROM handling module,
read the serial number from the EEPROM and pass it to Linux.
Signed-off-by: Nikita Kiryanov <nik...@compulab.co.il>
Signed-off-by: Igor Grinberg <grinb...@compulab.co.il>
---
board/cm_t35/Makefile | 4 ++-
board/cm_t35/eeprom.c | 79 ++++++++++++++++++++++++++++++++++++++++++++++
board/cm_t35/eeprom.h | 38 ++++++++++++++++++++++
include/configs/cm_t35.h | 2 +
4 files changed, 122 insertions(+), 1 deletions(-)
create mode 100644 board/cm_t35/eeprom.c
create mode 100644 board/cm_t35/eeprom.h
diff --git a/board/cm_t35/Makefile b/board/cm_t35/Makefile
index 27693f0..894fa09 100644
--- a/board/cm_t35/Makefile
+++ b/board/cm_t35/Makefile
@@ -25,7 +25,9 @@ include $(TOPDIR)/config.mk
LIB = $(obj)lib$(BOARD).o
-COBJS := cm_t35.o leds.o
+COBJS-$(CONFIG_DRIVER_OMAP34XX_I2C) += eeprom.o
+
+COBJS := cm_t35.o leds.o $(COBJS-y)
SRCS := $(COBJS:.o=.c)
OBJS := $(addprefix $(obj),$(COBJS))
diff --git a/board/cm_t35/eeprom.c b/board/cm_t35/eeprom.c
new file mode 100644
index 0000000..3bd7751
--- /dev/null
+++ b/board/cm_t35/eeprom.c
@@ -0,0 +1,79 @@
+/*
+ * (C) Copyright 2011 CompuLab, Ltd. <www.compulab.co.il>
+ *
+ * Authors: Nikita Kiryanov <nik...@compulab.co.il>
+ * Igor Grinberg <grinb...@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_ADDR 0x50
+
+#define EEPROM_LAYOUT_VER_OFFSET 44
+#define BOARD_SERIAL_OFFSET 20
+#define BOARD_SERIAL_OFFSET_LEGACY 8
+
+#define LAYOUT_INVALID 0
+#define LAYOUT_LEGACY 0xff
+
+static uchar eeprom_layout; /* Implicitly LAYOUT_INVALID */
+
+static int cm_t3x_eeprom_read(uint offset, uchar *buf, int len)
+{
+ return i2c_read(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, &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];
+ }
+}
diff --git a/board/cm_t35/eeprom.h b/board/cm_t35/eeprom.h
new file mode 100644
index 0000000..97a002a
--- /dev/null
+++ b/board/cm_t35/eeprom.h
@@ -0,0 +1,38 @@
+/*
+ * (C) Copyright 2011 CompuLab, Ltd. <www.compulab.co.il>
+ *
+ * Authors: Nikita Kiryanov <nik...@compulab.co.il>
+ * Igor Grinberg <grinb...@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.
+ */
+#ifndef _EEPROM_
+#define _EEPROM_
+
+#include <common.h>
+
+#ifndef CONFIG_DRIVER_OMAP34XX_I2C
+void get_board_serial(struct tag_serialnr *serialnr)
+{
+ /*
+ * This corresponds to what happens when we can communicate with the
+ * eeprom but don't get a valid board serial value.
+ */
+ serialnr->low = 0;
+ serialnr->high = 0;
+};
+#endif /* CONFIG_DRIVER_OMAP34XX_I2C */
+
+#endif
diff --git a/include/configs/cm_t35.h b/include/configs/cm_t35.h
index 61226d5..f868f78 100644
--- a/include/configs/cm_t35.h
+++ b/include/configs/cm_t35.h
@@ -72,6 +72,7 @@
#define CONFIG_SETUP_MEMORY_TAGS
#define CONFIG_INITRD_TAG
#define CONFIG_REVISION_TAG
+#define CONFIG_SERIAL_TAG
/*
* Size of malloc() pool
@@ -153,6 +154,7 @@
#define CONFIG_SYS_I2C_BUS 0
#define CONFIG_SYS_I2C_BUS_SELECT 1
#define CONFIG_DRIVER_OMAP34XX_I2C
+#define CONFIG_SYS_I2C_EEPROM_ADDR_LEN 1
/*
* TWL4030
--
1.7.3.4
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