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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* See file CREDITS for list of people who contributed to this
* project.
*/
#ifndef __TLV_EEPROM_H_
#define __TLV_EEPROM_H_
#include <linux/errno.h>
/*
* The Definition of the TlvInfo EEPROM format can be found at onie.org or
* github.com/onie
*/
/*
* TlvInfo header: Layout of the header for the TlvInfo format
*
* See the end of this file for details of this eeprom format
*/
struct __attribute__ ((__packed__)) tlvinfo_header {
char signature[8]; /* 0x00 - 0x07 EEPROM Tag "TlvInfo" */
u8 version; /* 0x08 Structure version */
u16 totallen; /* 0x09 - 0x0A Length of all data which follows */
};
// Header Field Constants
#define TLV_INFO_ID_STRING "TlvInfo"
#define TLV_INFO_VERSION 0x01
#define TLV_INFO_MAX_LEN 2048
#define TLV_TOTAL_LEN_MAX (TLV_INFO_MAX_LEN - \
sizeof(struct tlvinfo_header))
/*
* TlvInfo TLV: Layout of a TLV field
*/
struct __attribute__ ((__packed__)) tlvinfo_tlv {
u8 type;
u8 length;
u8 value[0];
};
/* Maximum length of a TLV value in bytes */
#define TLV_VALUE_MAX_LEN 255
/**
* The TLV Types.
*
* Keep these in sync with tlv_code_list in cmd/tlv_eeprom.c
*/
#define TLV_CODE_PRODUCT_NAME 0x21
#define TLV_CODE_PART_NUMBER 0x22
#define TLV_CODE_SERIAL_NUMBER 0x23
#define TLV_CODE_MAC_BASE 0x24
#define TLV_CODE_MANUF_DATE 0x25
#define TLV_CODE_DEVICE_VERSION 0x26
#define TLV_CODE_LABEL_REVISION 0x27
#define TLV_CODE_PLATFORM_NAME 0x28
#define TLV_CODE_ONIE_VERSION 0x29
#define TLV_CODE_MAC_SIZE 0x2A
#define TLV_CODE_MANUF_NAME 0x2B
#define TLV_CODE_MANUF_COUNTRY 0x2C
#define TLV_CODE_VENDOR_NAME 0x2D
#define TLV_CODE_DIAG_VERSION 0x2E
#define TLV_CODE_SERVICE_TAG 0x2F
#define TLV_CODE_VENDOR_EXT 0xFD
#define TLV_CODE_CRC_32 0xFE
#if CONFIG_IS_ENABLED(CMD_TLV_EEPROM)
/**
* read_tlv_eeprom - Read the EEPROM binary data from the hardware
* @eeprom: Pointer to buffer to hold the binary data
* @offset: Offset within EEPROM block to read data from
* @len : Maximum size of buffer
* @dev : EEPROM device to read
*
* Note: this routine does not validate the EEPROM data.
*
*/
int read_tlv_eeprom(void *eeprom, int offset, int len, int dev);
/**
* write_tlv_eeprom - Write the entire EEPROM binary data to the hardware
* @eeprom: Pointer to buffer to hold the binary data
* @len : Maximum size of buffer
* @dev : EEPROM device to write
*
* Note: this routine does not validate the EEPROM data.
*
*/
int write_tlv_eeprom(void *eeprom, int len, int dev);
/**
* read_tlvinfo_tlv_eeprom - Read the TLV from EEPROM, and validate
* @eeprom: Pointer to buffer to hold the binary data. Must point to a buffer
* of size at least TLV_INFO_MAX_LEN.
* @hdr : Points to pointer to TLV header (output)
* @first_entry : Points to pointer to first TLV entry (output)
* @dev : EEPROM device to read
*
* Store the raw EEPROM data from EEPROM @dev in the @eeprom buffer. If TLV is
* valid set *@hdr and *@first_entry.
*
* Returns 0 when read from EEPROM is successful, and the data is valid.
* Returns <0 error value when EEPROM read fails. Return -EINVAL when TLV is
* invalid.
*
*/
int read_tlvinfo_tlv_eeprom(void *eeprom, struct tlvinfo_header **hdr,
struct tlvinfo_tlv **first_entry, int dev);
#else /* !CONFIG_IS_ENABLED(CMD_TLV_EEPROM) */
static inline int read_tlv_eeprom(void *eeprom, int offset, int len, int dev)
{
return -ENOSYS;
}
static inline int write_tlv_eeprom(void *eeprom, int len)
{
return -ENOSYS;
}
static inline int
read_tlvinfo_tlv_eeprom(void *eeprom, struct tlvinfo_header **hdr,
struct tlvinfo_tlv **first_entry, int dev)
{
return -ENOSYS;
}
#endif /* CONFIG_IS_ENABLED(CMD_TLV_EEPROM) */
/**
* is_valid_tlvinfo_header
*
* Perform sanity checks on the first 11 bytes of the TlvInfo EEPROM
* data pointed to by the parameter:
* 1. First 8 bytes contain null-terminated ASCII string "TlvInfo"
* 2. Version byte is 1
* 3. Total length bytes contain value which is less than or equal
* to the allowed maximum (2048-11)
*
*/
static inline bool is_valid_tlvinfo_header(struct tlvinfo_header *hdr)
{
return ((strcmp(hdr->signature, TLV_INFO_ID_STRING) == 0) &&
(hdr->version == TLV_INFO_VERSION) &&
(be16_to_cpu(hdr->totallen) <= TLV_TOTAL_LEN_MAX));
}
#endif /* __TLV_EEPROM_H_ */
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