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Several TI EVMs have EEPROM that can contain board description information such as revision, DDR definition, serial number, etc. In just about all cases, these EEPROM are on the I2C bus and provides us the opportunity to centralize the generic operations involved. The on-board EEPROM on the BeagleBone Black, BeagleBone, AM335x EVM, AM43x GP EVM, AM57xx-evm, BeagleBoard-X15 share the same format. However, DRA-7* EVMs, OMAP4SDP use a modified format. We hence introduce logic which is generic between these platforms without enforcing any specific format. This allows the boards to use the relevant format for operations that they might choose. This module will compile for all TI SoC based boards when CONFIG_TI_I2C_BOARD_DETECT is enabled to have optimal build times for platforms that require this support. It is important to note that this logic is fundamental to the board configuration process such as DDR configuration which is needed in SPL, hence cannot be part of the standard u-boot driver model (which is available later in the process). Hence, to aid efficiency, the eeprom contents are copied over to SRAM scratchpad memory area at the first invocation to retrieve data. To prevent churn with cases such as DRA7, where eeprom format maybe incompatible, we introduce a generic common format in eeprom which is made available over accessor functions for usage. Special handling for BBG1 EEPROM had to be introduced thanks to the weird eeprom rev contents used. The follow on patches introduce the use of this library for AM335x, AM437x, and AM57xx. Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com> Signed-off-by: Steve Kipisz <s-kipisz2@ti.com> Signed-off-by: Roger Quadros <rogerq@ti.com> Signed-off-by: Nishanth Menon <nm@ti.com> Reviewed-by: Tom Rini <trini@konsulko.com>
140 lines
4.1 KiB
C
140 lines
4.1 KiB
C
/*
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* Library to support early TI EVM EEPROM handling
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*
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* Copyright (C) 2015-2016 Texas Instruments Incorporated - http://www.ti.com
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef __BOARD_DETECT_H
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#define __BOARD_DETECT_H
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/* TI EEPROM MAGIC Header identifier */
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#define TI_EEPROM_HEADER_MAGIC 0xEE3355AA
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#define TI_DEAD_EEPROM_MAGIC 0xADEAD12C
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#define TI_EEPROM_HDR_NAME_LEN 8
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#define TI_EEPROM_HDR_REV_LEN 4
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#define TI_EEPROM_HDR_SERIAL_LEN 12
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#define TI_EEPROM_HDR_CONFIG_LEN 32
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#define TI_EEPROM_HDR_NO_OF_MAC_ADDR 3
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#define TI_EEPROM_HDR_ETH_ALEN 6
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/**
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* struct ti_am_eeprom - This structure holds data read in from the
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* AM335x, AM437x, AM57xx TI EVM EEPROMs.
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* @header: This holds the magic number
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* @name: The name of the board
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* @version: Board revision
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* @serial: Board serial number
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* @config: Reserved
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* @mac_addr: Any MAC addresses written in the EEPROM
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*
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* The data is this structure is read from the EEPROM on the board.
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* It is used for board detection which is based on name. It is used
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* to configure specific TI boards. This allows booting of multiple
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* TI boards with a single MLO and u-boot.
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*/
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struct ti_am_eeprom {
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unsigned int header;
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char name[TI_EEPROM_HDR_NAME_LEN];
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char version[TI_EEPROM_HDR_REV_LEN];
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char serial[TI_EEPROM_HDR_SERIAL_LEN];
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char config[TI_EEPROM_HDR_CONFIG_LEN];
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char mac_addr[TI_EEPROM_HDR_NO_OF_MAC_ADDR][TI_EEPROM_HDR_ETH_ALEN];
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} __attribute__ ((__packed__));
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/**
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* struct ti_common_eeprom - Null terminated, usable EEPROM contents.
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* header: Magic number
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* @name: NULL terminated name
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* @version: NULL terminated version
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* @serial: NULL terminated serial number
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* @config: NULL terminated Board specific config options
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* @mac_addr: MAC addresses
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*/
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struct ti_common_eeprom {
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u32 header;
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char name[TI_EEPROM_HDR_NAME_LEN + 1];
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char version[TI_EEPROM_HDR_REV_LEN + 1];
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char serial[TI_EEPROM_HDR_SERIAL_LEN + 1];
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char config[TI_EEPROM_HDR_CONFIG_LEN + 1];
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char mac_addr[TI_EEPROM_HDR_NO_OF_MAC_ADDR][TI_EEPROM_HDR_ETH_ALEN];
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};
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#define TI_EEPROM_DATA ((struct ti_common_eeprom *)\
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OMAP_SRAM_SCRATCH_BOARD_EEPROM_START)
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/**
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* ti_i2c_eeprom_am_get() - Consolidated eeprom data collection for AM* TI EVMs
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* @bus_addr: I2C bus address
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* @dev_addr: I2C slave address
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*
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* ep in SRAM is populated by the this AM generic function that consolidates
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* the basic initialization logic common across all AM* platforms.
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*/
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int ti_i2c_eeprom_am_get(int bus_addr, int dev_addr);
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/**
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* board_ti_is() - Board detection logic for TI EVMs
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* @name_tag: Tag used in eeprom for the board
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*
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* Return: false if board information does not match OR eeprom wasn't read.
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* true otherwise
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*/
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bool board_ti_is(char *name_tag);
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/**
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* board_ti_rev_is() - Compare board revision for TI EVMs
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* @rev_tag: Revision tag to check in eeprom
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* @cmp_len: How many chars to compare?
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*
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* NOTE: revision information is often messed up (hence the str len match) :(
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*
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* Return: false if board information does not match OR eeprom was'nt read.
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* true otherwise
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*/
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bool board_ti_rev_is(char *rev_tag, int cmp_len);
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/**
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* board_ti_get_rev() - Get board revision for TI EVMs
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*
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* Return: NULL if eeprom was'nt read.
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* Board revision otherwise
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*/
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char *board_ti_get_rev(void);
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/**
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* board_ti_get_config() - Get board config for TI EVMs
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*
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* Return: NULL if eeprom was'nt read.
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* Board config otherwise
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*/
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char *board_ti_get_config(void);
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/**
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* board_ti_get_name() - Get board name for TI EVMs
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*
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* Return: NULL if eeprom was'nt read.
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* Board name otherwise
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*/
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char *board_ti_get_name(void);
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/**
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* board_ti_get_eth_mac_addr() - Get Ethernet MAC address from EEPROM MAC list
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* @index: 0 based index within the list of MAC addresses
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* @mac_addr: MAC address contained at the index is returned here
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*
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* Does not sanity check the mac_addr. Whatever is stored in EEPROM is returned.
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*/
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void board_ti_get_eth_mac_addr(int index, u8 mac_addr[TI_EEPROM_HDR_ETH_ALEN]);
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/**
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* set_board_info_env() - Setup commonly used board information environment vars
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* @name: Name of the board
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*
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* If name is NULL, default_name is used.
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*/
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void set_board_info_env(char *name);
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#endif /* __BOARD_DETECT_H */
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