[U-Boot,v2,3/6] cm-t35: add EEPROM module and pass Linux a serial number

Message ID	1325764937-7342-1-git-send-email-grinberg@compulab.co.il
State	Changes Requested
Headers	show Return-Path: <u-boot-bounces@lists.denx.de> From: Igor Grinberg <grinberg@compulab.co.il> To: Tom Rini <trini@ti.com> Date: Thu, 5 Jan 2012 14:02:17 +0200 Message-Id: <1325764937-7342-1-git-send-email-grinberg@compulab.co.il> In-Reply-To: <4F031628.9070502@ti.com> References: <4F031628.9070502@ti.com> Cc: u-boot@lists.denx.de, Sandeep Paulraj <s-paulraj@ti.com> Subject: [U-Boot] [PATCH v2 3/6] cm-t35: add EEPROM module and pass Linux a serial number Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: u-boot-bounces@lists.denx.de Errors-To: u-boot-bounces@lists.denx.de

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..93ed6cb --- /dev/null +++ b/board/cm_t35/eeprom.c @@ -0,0 +1,78 @@ +/* + * (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 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]; + } +} 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 <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. + */ +#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..fe91c10 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 +154,8 @@ #define CONFIG_SYS_I2C_BUS 0 #define CONFIG_SYS_I2C_BUS_SELECT 1 #define CONFIG_DRIVER_OMAP34XX_I2C +#define CONFIG_SYS_I2C_EEPROM_ADDR 0x50 +#define CONFIG_SYS_I2C_EEPROM_ADDR_LEN 1 /* * TWL4030

[U-Boot,v2,3/6] cm-t35: add EEPROM module and pass Linux a serial number

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