board/ti/common/board_detect.c - u-boot-mtk - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Library to support early TI EVM EEPROM handling
  *
  * Copyright (C) 2015-2016 Texas Instruments Incorporated - http://www.ti.com/
  *	Lokesh Vutla
  *	Steve Kipisz
  */

 #include <common.h>
 #include <asm/arch/hardware.h>
 #include <asm/omap_common.h>
 #include <dm/uclass.h>
 #include <env.h>
 #include <i2c.h>

 #include "board_detect.h"

 #if !defined(CONFIG_DM_I2C)
 /**
  * ti_i2c_eeprom_init - Initialize an i2c bus and probe for a device
  * @i2c_bus: i2c bus number to initialize
  * @dev_addr: Device address to probe for
  *
  * Return: 0 on success or corresponding error on failure.
  */
 static int __maybe_unused ti_i2c_eeprom_init(int i2c_bus, int dev_addr)
 {
 	int rc;

 	if (i2c_bus >= 0) {
 		rc = i2c_set_bus_num(i2c_bus);
 		if (rc)
 			return rc;
 	}

 	return i2c_probe(dev_addr);
 }

 /**
  * ti_i2c_eeprom_read - Read data from an EEPROM
  * @dev_addr: The device address of the EEPROM
  * @offset: Offset to start reading in the EEPROM
  * @ep: Pointer to a buffer to read into
  * @epsize: Size of buffer
  *
  * Return: 0 on success or corresponding result of i2c_read
  */
 static int __maybe_unused ti_i2c_eeprom_read(int dev_addr, int offset,
 					     uchar *ep, int epsize)
 {
 	return i2c_read(dev_addr, offset, 2, ep, epsize);
 }
 #endif

 /**
  * ti_eeprom_string_cleanup() - Handle eeprom programming errors
  * @s:	eeprom string (should be NULL terminated)
  *
  * Some Board manufacturers do not add a NULL termination at the
  * end of string, instead some binary information is kludged in, hence
  * convert the string to just printable characters of ASCII chart.
  */
 static void __maybe_unused ti_eeprom_string_cleanup(char *s)
 {
 	int i, l;

 	l = strlen(s);
 	for (i = 0; i < l; i++, s++)
 		if (*s < ' ' || *s > '~') {
 			*s = 0;
 			break;
 		}
 }

 __weak void gpi2c_init(void)
 {
 }

 static int __maybe_unused ti_i2c_eeprom_get(int bus_addr, int dev_addr,
 					    u32 header, u32 size, uint8_t *ep)
 {
 	u32 hdr_read;
 	int rc;

 #if defined(CONFIG_DM_I2C)
 	struct udevice *dev;
 	struct udevice *bus;

 	rc = uclass_get_device_by_seq(UCLASS_I2C, bus_addr, &bus);
 	if (rc)
 		return rc;
 	rc = i2c_get_chip(bus, dev_addr, 1, &dev);
 	if (rc)
 		return rc;

 	/*
 	 * Read the header first then only read the other contents.
 	 */
 	rc = i2c_set_chip_offset_len(dev, 2);
 	if (rc)
 		return rc;

 	rc = dm_i2c_read(dev, 0, (uint8_t *)&hdr_read, 4);
 	if (rc)
 		return rc;

 	/* Corrupted data??? */
 	if (hdr_read != header) {
 		rc = dm_i2c_read(dev, 0, (uint8_t *)&hdr_read, 4);
 		/*
 		 * read the eeprom header using i2c again, but use only a
 		 * 1 byte address (some legacy boards need this..)
 		 */
 		if (rc) {
 			rc =  i2c_set_chip_offset_len(dev, 1);
 			if (rc)
 				return rc;

 			rc = dm_i2c_read(dev, 0, (uint8_t *)&hdr_read, 4);
 		}
 		if (rc)
 			return rc;
 	}
 	if (hdr_read != header)
 		return -1;

 	rc = dm_i2c_read(dev, 0, ep, size);
 	if (rc)
 		return rc;
 #else
 	u32 byte;

 	gpi2c_init();
 	rc = ti_i2c_eeprom_init(bus_addr, dev_addr);
 	if (rc)
 		return rc;

 	/*
 	 * Read the header first then only read the other contents.
 	 */
 	byte = 2;

 	rc = i2c_read(dev_addr, 0x0, byte, (uint8_t *)&hdr_read, 4);
 	if (rc)
 		return rc;

 	/* Corrupted data??? */
 	if (hdr_read != header) {
 		rc = i2c_read(dev_addr, 0x0, byte, (uint8_t *)&hdr_read, 4);
 		/*
 		 * read the eeprom header using i2c again, but use only a
 		 * 1 byte address (some legacy boards need this..)
 		 */
 		byte = 1;
 		if (rc) {
 			rc = i2c_read(dev_addr, 0x0, byte, (uint8_t *)&hdr_read,
 				      4);
 		}
 		if (rc)
 			return rc;
 	}
 	if (hdr_read != header)
 		return -1;

 	rc = i2c_read(dev_addr, 0x0, byte, ep, size);
 	if (rc)
 		return rc;
 #endif
 	return 0;
 }

 int __maybe_unused ti_i2c_eeprom_am_set(const char *name, const char *rev)
 {
 	struct ti_common_eeprom *ep;

 	if (!name || !rev)
 		return -1;

 	ep = TI_EEPROM_DATA;
 	if (ep->header == TI_EEPROM_HEADER_MAGIC)
 		goto already_set;

 	/* Set to 0 all fields */
 	memset(ep, 0, sizeof(*ep));
 	strncpy(ep->name, name, TI_EEPROM_HDR_NAME_LEN);
 	strncpy(ep->version, rev, TI_EEPROM_HDR_REV_LEN);
 	/* Some dummy serial number to identify the platform */
 	strncpy(ep->serial, "0000", TI_EEPROM_HDR_SERIAL_LEN);
 	/* Mark it with a valid header */
 	ep->header = TI_EEPROM_HEADER_MAGIC;

 already_set:
 	return 0;
 }

 int __maybe_unused ti_i2c_eeprom_am_get(int bus_addr, int dev_addr)
 {
 	int rc;
 	struct ti_am_eeprom am_ep;
 	struct ti_common_eeprom *ep;

 	ep = TI_EEPROM_DATA;
 #ifndef CONFIG_SPL_BUILD
 	if (ep->header == TI_EEPROM_HEADER_MAGIC)
 		return 0; /* EEPROM has already been read */
 #endif

 	/* Initialize with a known bad marker for i2c fails.. */
 	ep->header = TI_DEAD_EEPROM_MAGIC;
 	ep->name[0] = 0x0;
 	ep->version[0] = 0x0;
 	ep->serial[0] = 0x0;
 	ep->config[0] = 0x0;

 	rc = ti_i2c_eeprom_get(bus_addr, dev_addr, TI_EEPROM_HEADER_MAGIC,
 			       sizeof(am_ep), (uint8_t *)&am_ep);
 	if (rc)
 		return rc;

 	ep->header = am_ep.header;
 	strlcpy(ep->name, am_ep.name, TI_EEPROM_HDR_NAME_LEN + 1);
 	ti_eeprom_string_cleanup(ep->name);

 	/* BeagleBone Green '1' eeprom, board_rev: 0x1a 0x00 0x00 0x00 */
 	if (am_ep.version[0] == 0x1a && am_ep.version[1] == 0x00 &&
 	    am_ep.version[2] == 0x00 && am_ep.version[3] == 0x00)
 		strlcpy(ep->version, "BBG1", TI_EEPROM_HDR_REV_LEN + 1);
 	else
 		strlcpy(ep->version, am_ep.version, TI_EEPROM_HDR_REV_LEN + 1);
 	ti_eeprom_string_cleanup(ep->version);
 	strlcpy(ep->serial, am_ep.serial, TI_EEPROM_HDR_SERIAL_LEN + 1);
 	ti_eeprom_string_cleanup(ep->serial);
 	strlcpy(ep->config, am_ep.config, TI_EEPROM_HDR_CONFIG_LEN + 1);
 	ti_eeprom_string_cleanup(ep->config);

 	memcpy(ep->mac_addr, am_ep.mac_addr,
 	       TI_EEPROM_HDR_NO_OF_MAC_ADDR * TI_EEPROM_HDR_ETH_ALEN);

 	return 0;
 }

 int __maybe_unused ti_i2c_eeprom_dra7_get(int bus_addr, int dev_addr)
 {
 	int rc, offset = 0;
 	struct dra7_eeprom dra7_ep;
 	struct ti_common_eeprom *ep;

 	ep = TI_EEPROM_DATA;
 #ifndef CONFIG_SPL_BUILD
 	if (ep->header == DRA7_EEPROM_HEADER_MAGIC)
 		return 0; /* EEPROM has already been read */
 #endif

 	/* Initialize with a known bad marker for i2c fails.. */
 	ep->header = TI_DEAD_EEPROM_MAGIC;
 	ep->name[0] = 0x0;
 	ep->version[0] = 0x0;
 	ep->serial[0] = 0x0;
 	ep->config[0] = 0x0;
 	ep->emif1_size = 0;
 	ep->emif2_size = 0;

 	rc = ti_i2c_eeprom_get(bus_addr, dev_addr, DRA7_EEPROM_HEADER_MAGIC,
 			       sizeof(dra7_ep), (uint8_t *)&dra7_ep);
 	if (rc)
 		return rc;

 	ep->header = dra7_ep.header;
 	strlcpy(ep->name, dra7_ep.name, TI_EEPROM_HDR_NAME_LEN + 1);
 	ti_eeprom_string_cleanup(ep->name);

 	offset = dra7_ep.version_major - 1;

 	/* Rev F is skipped */
 	if (offset >= 5)
 		offset = offset + 1;
 	snprintf(ep->version, TI_EEPROM_HDR_REV_LEN + 1, "%c.%d",
 		 'A' + offset, dra7_ep.version_minor);
 	ti_eeprom_string_cleanup(ep->version);
 	ep->emif1_size = (u64)dra7_ep.emif1_size;
 	ep->emif2_size = (u64)dra7_ep.emif2_size;
 	strlcpy(ep->config, dra7_ep.config, TI_EEPROM_HDR_CONFIG_LEN + 1);
 	ti_eeprom_string_cleanup(ep->config);

 	return 0;
 }

 static int ti_i2c_eeprom_am6_parse_record(struct ti_am6_eeprom_record *record,
 					  struct ti_am6_eeprom *ep,
 					  char **mac_addr,
 					  u8 mac_addr_max_cnt,
 					  u8 *mac_addr_cnt)
 {
 	switch (record->header.id) {
 	case TI_AM6_EEPROM_RECORD_BOARD_INFO:
 		if (record->header.len != sizeof(record->data.board_info))
 			return -EINVAL;

 		if (!ep)
 			break;

 		/* Populate (and clean, if needed) the board name */
 		strlcpy(ep->name, record->data.board_info.name,
 			sizeof(ep->name));
 		ti_eeprom_string_cleanup(ep->name);

 		/* Populate selected other fields from the board info record */
 		strlcpy(ep->version, record->data.board_info.version,
 			sizeof(ep->version));
 		strlcpy(ep->software_revision,
 			record->data.board_info.software_revision,
 			sizeof(ep->software_revision));
 		strlcpy(ep->serial, record->data.board_info.serial,
 			sizeof(ep->serial));
 		break;
 	case TI_AM6_EEPROM_RECORD_MAC_INFO:
 		if (record->header.len != sizeof(record->data.mac_info))
 			return -EINVAL;

 		if (!mac_addr || !mac_addr_max_cnt)
 			break;

 		*mac_addr_cnt = ((record->data.mac_info.mac_control &
 				 TI_AM6_EEPROM_MAC_ADDR_COUNT_MASK) >>
 				 TI_AM6_EEPROM_MAC_ADDR_COUNT_SHIFT) + 1;

 		/*
 		 * The EEPROM can (but may not) hold a very large amount
 		 * of MAC addresses, by far exceeding what we want/can store
 		 * in the common memory array, so only grab what we can fit.
 		 * Note that a value of 0 means 1 MAC address, and so on.
 		 */
 		*mac_addr_cnt = min(*mac_addr_cnt, mac_addr_max_cnt);

 		memcpy(mac_addr, record->data.mac_info.mac_addr,
 		       *mac_addr_cnt * TI_EEPROM_HDR_ETH_ALEN);
 		break;
 	case 0x00:
 		/* Illegal value... Fall through... */
 	case 0xFF:
 		/* Illegal value... Something went horribly wrong... */
 		return -EINVAL;
 	default:
 		pr_warn("%s: Ignoring record id %u\n", __func__,
 			record->header.id);
 	}

 	return 0;
 }

 int __maybe_unused ti_i2c_eeprom_am6_get(int bus_addr, int dev_addr,
 					 struct ti_am6_eeprom *ep,
 					 char **mac_addr,
 					 u8 mac_addr_max_cnt,
 					 u8 *mac_addr_cnt)
 {
 	struct udevice *dev;
 	struct udevice *bus;
 	unsigned int eeprom_addr;
 	struct ti_am6_eeprom_record_board_id board_id;
 	struct ti_am6_eeprom_record record;
 	int rc;

 	/* Initialize with a known bad marker for i2c fails.. */
 	memset(ep, 0, sizeof(*ep));
 	ep->header = TI_DEAD_EEPROM_MAGIC;

 	/* Read the board ID record which is always the first EEPROM record */
 	rc = ti_i2c_eeprom_get(bus_addr, dev_addr, TI_EEPROM_HEADER_MAGIC,
 			       sizeof(board_id), (uint8_t *)&board_id);
 	if (rc)
 		return rc;

 	if (board_id.header.id != TI_AM6_EEPROM_RECORD_BOARD_ID) {
 		pr_err("%s: Invalid board ID record!\n", __func__);
 		return -EINVAL;
 	}

 	/* Establish DM handle to board config EEPROM */
 	rc = uclass_get_device_by_seq(UCLASS_I2C, bus_addr, &bus);
 	if (rc)
 		return rc;
 	rc = i2c_get_chip(bus, dev_addr, 1, &dev);
 	if (rc)
 		return rc;

 	ep->header = TI_EEPROM_HEADER_MAGIC;

 	/* Ready to parse TLV structure. Initialize variables... */
 	*mac_addr_cnt = 0;

 	/*
 	 * After the all-encompassing board ID record all other records follow
 	 * a TLV-type scheme. Point to the first such record and then start
 	 * parsing those one by one.
 	 */
 	eeprom_addr = sizeof(board_id);

 	while (true) {
 		rc = dm_i2c_read(dev, eeprom_addr, (uint8_t *)&record.header,
 				 sizeof(record.header));
 		if (rc)
 			return rc;

 		/*
 		 * Check for end of list marker. If we reached it don't go
 		 * any further and stop parsing right here.
 		 */
 		if (record.header.id == TI_AM6_EEPROM_RECORD_END_LIST)
 			break;

 		eeprom_addr += sizeof(record.header);

 		debug("%s: dev_addr=0x%02x header.id=%u header.len=%u\n",
 		      __func__, dev_addr, record.header.id,
 		      record.header.len);

 		/* Read record into memory if it fits */
 		if (record.header.len <= sizeof(record.data)) {
 			rc = dm_i2c_read(dev, eeprom_addr,
 					 (uint8_t *)&record.data,
 					 record.header.len);
 			if (rc)
 				return rc;

 			/* Process record */
 			rc = ti_i2c_eeprom_am6_parse_record(&record, ep,
 							    mac_addr,
 							    mac_addr_max_cnt,
 							    mac_addr_cnt);
 			if (rc) {
 				pr_err("%s: EEPROM parsing error!\n", __func__);
 				return rc;
 			}
 		} else {
 			/*
 			 * We may get here in case of larger records which
 			 * are not yet understood.
 			 */
 			pr_err("%s: Ignoring record id %u\n", __func__,
 			       record.header.id);
 		}

 		eeprom_addr += record.header.len;
 	}

 	return 0;
 }

 int __maybe_unused ti_i2c_eeprom_am6_get_base(int bus_addr, int dev_addr)
 {
 	struct ti_am6_eeprom *ep = TI_AM6_EEPROM_DATA;
 	int ret;

 	/*
 	 * Always execute EEPROM read by not allowing to bypass it during the
 	 * first invocation of SPL which happens on the R5 core.
 	 */
 #if !(defined(CONFIG_SPL_BUILD) && defined(CONFIG_CPU_V7R))
 	if (ep->header == TI_EEPROM_HEADER_MAGIC) {
 		debug("%s: EEPROM has already been read\n", __func__);
 		return 0;
 	}
 #endif

 	ret = ti_i2c_eeprom_am6_get(bus_addr, dev_addr, ep,
 				    (char **)ep->mac_addr,
 				    AM6_EEPROM_HDR_NO_OF_MAC_ADDR,
 				    &ep->mac_addr_cnt);
 	return ret;
 }

 bool __maybe_unused board_ti_is(char *name_tag)
 {
 	struct ti_common_eeprom *ep = TI_EEPROM_DATA;

 	if (ep->header == TI_DEAD_EEPROM_MAGIC)
 		return false;
 	return !strncmp(ep->name, name_tag, TI_EEPROM_HDR_NAME_LEN);
 }

 bool __maybe_unused board_ti_rev_is(char *rev_tag, int cmp_len)
 {
 	struct ti_common_eeprom *ep = TI_EEPROM_DATA;
 	int l;

 	if (ep->header == TI_DEAD_EEPROM_MAGIC)
 		return false;

 	l = cmp_len > TI_EEPROM_HDR_REV_LEN ? TI_EEPROM_HDR_REV_LEN : cmp_len;
 	return !strncmp(ep->version, rev_tag, l);
 }

 char * __maybe_unused board_ti_get_rev(void)
 {
 	struct ti_common_eeprom *ep = TI_EEPROM_DATA;

 	/* if ep->header == TI_DEAD_EEPROM_MAGIC, this is empty already */
 	return ep->version;
 }

 char * __maybe_unused board_ti_get_config(void)
 {
 	struct ti_common_eeprom *ep = TI_EEPROM_DATA;

 	/* if ep->header == TI_DEAD_EEPROM_MAGIC, this is empty already */
 	return ep->config;
 }

 char * __maybe_unused board_ti_get_name(void)
 {
 	struct ti_common_eeprom *ep = TI_EEPROM_DATA;

 	/* if ep->header == TI_DEAD_EEPROM_MAGIC, this is empty already */
 	return ep->name;
 }

 void __maybe_unused
 board_ti_get_eth_mac_addr(int index,
 			  u8 mac_addr[TI_EEPROM_HDR_ETH_ALEN])
 {
 	struct ti_common_eeprom *ep = TI_EEPROM_DATA;

 	if (ep->header == TI_DEAD_EEPROM_MAGIC)
 		goto fail;

 	if (index < 0 || index >= TI_EEPROM_HDR_NO_OF_MAC_ADDR)
 		goto fail;

 	memcpy(mac_addr, ep->mac_addr[index], TI_EEPROM_HDR_ETH_ALEN);
 	return;

 fail:
 	memset(mac_addr, 0, TI_EEPROM_HDR_ETH_ALEN);
 }

 void __maybe_unused
 board_ti_am6_get_eth_mac_addr(int index,
 			      u8 mac_addr[TI_EEPROM_HDR_ETH_ALEN])
 {
 	struct ti_am6_eeprom *ep = TI_AM6_EEPROM_DATA;

 	if (ep->header == TI_DEAD_EEPROM_MAGIC)
 		goto fail;

 	if (index < 0 || index >= ep->mac_addr_cnt)
 		goto fail;

 	memcpy(mac_addr, ep->mac_addr[index], TI_EEPROM_HDR_ETH_ALEN);
 	return;

 fail:
 	memset(mac_addr, 0, TI_EEPROM_HDR_ETH_ALEN);
 }

 u64 __maybe_unused board_ti_get_emif1_size(void)
 {
 	struct ti_common_eeprom *ep = TI_EEPROM_DATA;

 	if (ep->header != DRA7_EEPROM_HEADER_MAGIC)
 		return 0;

 	return ep->emif1_size;
 }

 u64 __maybe_unused board_ti_get_emif2_size(void)
 {
 	struct ti_common_eeprom *ep = TI_EEPROM_DATA;

 	if (ep->header != DRA7_EEPROM_HEADER_MAGIC)
 		return 0;

 	return ep->emif2_size;
 }

 void __maybe_unused set_board_info_env(char *name)
 {
 	char *unknown = "unknown";
 	struct ti_common_eeprom *ep = TI_EEPROM_DATA;

 	if (name)
 		env_set("board_name", name);
 	else if (ep->name)
 		env_set("board_name", ep->name);
 	else
 		env_set("board_name", unknown);

 	if (ep->version)
 		env_set("board_rev", ep->version);
 	else
 		env_set("board_rev", unknown);

 	if (ep->serial)
 		env_set("board_serial", ep->serial);
 	else
 		env_set("board_serial", unknown);
 }

 void __maybe_unused set_board_info_env_am6(char *name)
 {
 	char *unknown = "unknown";
 	struct ti_am6_eeprom *ep = TI_AM6_EEPROM_DATA;

 	if (name)
 		env_set("board_name", name);
 	else if (ep->name)
 		env_set("board_name", ep->name);
 	else
 		env_set("board_name", unknown);

 	if (ep->version)
 		env_set("board_rev", ep->version);
 	else
 		env_set("board_rev", unknown);

 	if (ep->software_revision)
 		env_set("board_software_revision", ep->software_revision);
 	else
 		env_set("board_software_revision", unknown);

 	if (ep->serial)
 		env_set("board_serial", ep->serial);
 	else
 		env_set("board_serial", unknown);
 }

 static u64 mac_to_u64(u8 mac[6])
 {
 	int i;
 	u64 addr = 0;

 	for (i = 0; i < 6; i++) {
 		addr <<= 8;
 		addr |= mac[i];
 	}

 	return addr;
 }

 static void u64_to_mac(u64 addr, u8 mac[6])
 {
 	mac[5] = addr;
 	mac[4] = addr >> 8;
 	mac[3] = addr >> 16;
 	mac[2] = addr >> 24;
 	mac[1] = addr >> 32;
 	mac[0] = addr >> 40;
 }

 void board_ti_set_ethaddr(int index)
 {
 	uint8_t mac_addr[6];
 	int i;
 	u64 mac1, mac2;
 	u8 mac_addr1[6], mac_addr2[6];
 	int num_macs;
 	/*
 	 * Export any Ethernet MAC addresses from EEPROM.
 	 * The 2 MAC addresses in EEPROM define the address range.
 	 */
 	board_ti_get_eth_mac_addr(0, mac_addr1);
 	board_ti_get_eth_mac_addr(1, mac_addr2);

 	if (is_valid_ethaddr(mac_addr1) && is_valid_ethaddr(mac_addr2)) {
 		mac1 = mac_to_u64(mac_addr1);
 		mac2 = mac_to_u64(mac_addr2);

 		/* must contain an address range */
 		num_macs = mac2 - mac1 + 1;
 		if (num_macs <= 0)
 			return;

 		if (num_macs > 50) {
 			printf("%s: Too many MAC addresses: %d. Limiting to 50\n",
 			       __func__, num_macs);
 			num_macs = 50;
 		}

 		for (i = 0; i < num_macs; i++) {
 			u64_to_mac(mac1 + i, mac_addr);
 			if (is_valid_ethaddr(mac_addr)) {
 				eth_env_set_enetaddr_by_index("eth", i + index,
 							      mac_addr);
 			}
 		}
 	}
 }

 void board_ti_am6_set_ethaddr(int index, int count)
 {
 	u8 mac_addr[6];
 	int i;

 	for (i = 0; i < count; i++) {
 		board_ti_am6_get_eth_mac_addr(i, mac_addr);
 		if (is_valid_ethaddr(mac_addr))
 			eth_env_set_enetaddr_by_index("eth", i + index,
 						      mac_addr);
 	}
 }

 bool __maybe_unused board_ti_was_eeprom_read(void)
 {
 	struct ti_common_eeprom *ep = TI_EEPROM_DATA;

 	if (ep->header == TI_EEPROM_HEADER_MAGIC)
 		return true;
 	else
 		return false;
 }
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* Library to support early TI EVM EEPROM handling
	*
	* Copyright (C) 2015-2016 Texas Instruments Incorporated - http://www.ti.com/
	* Lokesh Vutla
	* Steve Kipisz
	*/

	#include <common.h>
	#include <asm/arch/hardware.h>
	#include <asm/omap_common.h>
	#include <dm/uclass.h>
	#include <env.h>
	#include <i2c.h>

	#include "board_detect.h"

	#if !defined(CONFIG_DM_I2C)
	/**
	* ti_i2c_eeprom_init - Initialize an i2c bus and probe for a device
	* @i2c_bus: i2c bus number to initialize
	* @dev_addr: Device address to probe for
	*
	* Return: 0 on success or corresponding error on failure.
	*/
	static int __maybe_unused ti_i2c_eeprom_init(int i2c_bus, int dev_addr)
	{
	int rc;

	if (i2c_bus >= 0) {
	rc = i2c_set_bus_num(i2c_bus);
	if (rc)
	return rc;
	}

	return i2c_probe(dev_addr);
	}

	/**
	* ti_i2c_eeprom_read - Read data from an EEPROM
	* @dev_addr: The device address of the EEPROM
	* @offset: Offset to start reading in the EEPROM
	* @ep: Pointer to a buffer to read into
	* @epsize: Size of buffer
	*
	* Return: 0 on success or corresponding result of i2c_read
	*/
	static int __maybe_unused ti_i2c_eeprom_read(int dev_addr, int offset,
	uchar *ep, int epsize)
	{
	return i2c_read(dev_addr, offset, 2, ep, epsize);
	}
	#endif

	/**
	* ti_eeprom_string_cleanup() - Handle eeprom programming errors
	* @s: eeprom string (should be NULL terminated)
	*
	* Some Board manufacturers do not add a NULL termination at the
	* end of string, instead some binary information is kludged in, hence
	* convert the string to just printable characters of ASCII chart.
	*/
	static void __maybe_unused ti_eeprom_string_cleanup(char *s)
	{
	int i, l;

	l = strlen(s);
	for (i = 0; i < l; i++, s++)
	if (s < ' ' \|\| s > '~') {
	*s = 0;
	break;
	}
	}

	__weak void gpi2c_init(void)
	{
	}

	static int __maybe_unused ti_i2c_eeprom_get(int bus_addr, int dev_addr,
	u32 header, u32 size, uint8_t *ep)
	{
	u32 hdr_read;
	int rc;

	#if defined(CONFIG_DM_I2C)
	struct udevice *dev;
	struct udevice *bus;

	rc = uclass_get_device_by_seq(UCLASS_I2C, bus_addr, &bus);
	if (rc)
	return rc;
	rc = i2c_get_chip(bus, dev_addr, 1, &dev);
	if (rc)
	return rc;

	/*
	* Read the header first then only read the other contents.
	*/
	rc = i2c_set_chip_offset_len(dev, 2);
	if (rc)
	return rc;

	rc = dm_i2c_read(dev, 0, (uint8_t *)&hdr_read, 4);
	if (rc)
	return rc;

	/* Corrupted data??? */
	if (hdr_read != header) {
	rc = dm_i2c_read(dev, 0, (uint8_t *)&hdr_read, 4);
	/*
	* read the eeprom header using i2c again, but use only a
	* 1 byte address (some legacy boards need this..)
	*/
	if (rc) {
	rc = i2c_set_chip_offset_len(dev, 1);
	if (rc)
	return rc;

	rc = dm_i2c_read(dev, 0, (uint8_t *)&hdr_read, 4);
	}
	if (rc)
	return rc;
	}
	if (hdr_read != header)
	return -1;

	rc = dm_i2c_read(dev, 0, ep, size);
	if (rc)
	return rc;
	#else
	u32 byte;

	gpi2c_init();
	rc = ti_i2c_eeprom_init(bus_addr, dev_addr);
	if (rc)
	return rc;

	/*
	* Read the header first then only read the other contents.
	*/
	byte = 2;

	rc = i2c_read(dev_addr, 0x0, byte, (uint8_t *)&hdr_read, 4);
	if (rc)
	return rc;

	/* Corrupted data??? */
	if (hdr_read != header) {
	rc = i2c_read(dev_addr, 0x0, byte, (uint8_t *)&hdr_read, 4);
	/*
	* read the eeprom header using i2c again, but use only a
	* 1 byte address (some legacy boards need this..)
	*/
	byte = 1;
	if (rc) {
	rc = i2c_read(dev_addr, 0x0, byte, (uint8_t *)&hdr_read,
	4);
	}
	if (rc)
	return rc;
	}
	if (hdr_read != header)
	return -1;

	rc = i2c_read(dev_addr, 0x0, byte, ep, size);
	if (rc)
	return rc;
	#endif
	return 0;
	}

	int __maybe_unused ti_i2c_eeprom_am_set(const char name, const char rev)
	{
	struct ti_common_eeprom *ep;

	if (!name \|\| !rev)
	return -1;

	ep = TI_EEPROM_DATA;
	if (ep->header == TI_EEPROM_HEADER_MAGIC)
	goto already_set;

	/* Set to 0 all fields */
	memset(ep, 0, sizeof(*ep));
	strncpy(ep->name, name, TI_EEPROM_HDR_NAME_LEN);
	strncpy(ep->version, rev, TI_EEPROM_HDR_REV_LEN);
	/* Some dummy serial number to identify the platform */
	strncpy(ep->serial, "0000", TI_EEPROM_HDR_SERIAL_LEN);
	/* Mark it with a valid header */
	ep->header = TI_EEPROM_HEADER_MAGIC;

	already_set:
	return 0;
	}

	int __maybe_unused ti_i2c_eeprom_am_get(int bus_addr, int dev_addr)
	{
	int rc;
	struct ti_am_eeprom am_ep;
	struct ti_common_eeprom *ep;

	ep = TI_EEPROM_DATA;
	#ifndef CONFIG_SPL_BUILD
	if (ep->header == TI_EEPROM_HEADER_MAGIC)
	return 0; /* EEPROM has already been read */
	#endif

	/* Initialize with a known bad marker for i2c fails.. */
	ep->header = TI_DEAD_EEPROM_MAGIC;
	ep->name[0] = 0x0;
	ep->version[0] = 0x0;
	ep->serial[0] = 0x0;
	ep->config[0] = 0x0;

	rc = ti_i2c_eeprom_get(bus_addr, dev_addr, TI_EEPROM_HEADER_MAGIC,
	sizeof(am_ep), (uint8_t *)&am_ep);
	if (rc)
	return rc;

	ep->header = am_ep.header;
	strlcpy(ep->name, am_ep.name, TI_EEPROM_HDR_NAME_LEN + 1);
	ti_eeprom_string_cleanup(ep->name);

	/* BeagleBone Green '1' eeprom, board_rev: 0x1a 0x00 0x00 0x00 */
	if (am_ep.version[0] == 0x1a && am_ep.version[1] == 0x00 &&
	am_ep.version[2] == 0x00 && am_ep.version[3] == 0x00)
	strlcpy(ep->version, "BBG1", TI_EEPROM_HDR_REV_LEN + 1);
	else
	strlcpy(ep->version, am_ep.version, TI_EEPROM_HDR_REV_LEN + 1);
	ti_eeprom_string_cleanup(ep->version);
	strlcpy(ep->serial, am_ep.serial, TI_EEPROM_HDR_SERIAL_LEN + 1);
	ti_eeprom_string_cleanup(ep->serial);
	strlcpy(ep->config, am_ep.config, TI_EEPROM_HDR_CONFIG_LEN + 1);
	ti_eeprom_string_cleanup(ep->config);

	memcpy(ep->mac_addr, am_ep.mac_addr,
	TI_EEPROM_HDR_NO_OF_MAC_ADDR * TI_EEPROM_HDR_ETH_ALEN);

	return 0;
	}

	int __maybe_unused ti_i2c_eeprom_dra7_get(int bus_addr, int dev_addr)
	{
	int rc, offset = 0;
	struct dra7_eeprom dra7_ep;
	struct ti_common_eeprom *ep;

	ep = TI_EEPROM_DATA;
	#ifndef CONFIG_SPL_BUILD
	if (ep->header == DRA7_EEPROM_HEADER_MAGIC)
	return 0; /* EEPROM has already been read */
	#endif

	/* Initialize with a known bad marker for i2c fails.. */
	ep->header = TI_DEAD_EEPROM_MAGIC;
	ep->name[0] = 0x0;
	ep->version[0] = 0x0;
	ep->serial[0] = 0x0;
	ep->config[0] = 0x0;
	ep->emif1_size = 0;
	ep->emif2_size = 0;

	rc = ti_i2c_eeprom_get(bus_addr, dev_addr, DRA7_EEPROM_HEADER_MAGIC,
	sizeof(dra7_ep), (uint8_t *)&dra7_ep);
	if (rc)
	return rc;

	ep->header = dra7_ep.header;
	strlcpy(ep->name, dra7_ep.name, TI_EEPROM_HDR_NAME_LEN + 1);
	ti_eeprom_string_cleanup(ep->name);

	offset = dra7_ep.version_major - 1;

	/* Rev F is skipped */
	if (offset >= 5)
	offset = offset + 1;
	snprintf(ep->version, TI_EEPROM_HDR_REV_LEN + 1, "%c.%d",
	'A' + offset, dra7_ep.version_minor);
	ti_eeprom_string_cleanup(ep->version);
	ep->emif1_size = (u64)dra7_ep.emif1_size;
	ep->emif2_size = (u64)dra7_ep.emif2_size;
	strlcpy(ep->config, dra7_ep.config, TI_EEPROM_HDR_CONFIG_LEN + 1);
	ti_eeprom_string_cleanup(ep->config);

	return 0;
	}

	static int ti_i2c_eeprom_am6_parse_record(struct ti_am6_eeprom_record *record,
	struct ti_am6_eeprom *ep,
	char **mac_addr,
	u8 mac_addr_max_cnt,
	u8 *mac_addr_cnt)
	{
	switch (record->header.id) {
	case TI_AM6_EEPROM_RECORD_BOARD_INFO:
	if (record->header.len != sizeof(record->data.board_info))
	return -EINVAL;

	if (!ep)
	break;

	/* Populate (and clean, if needed) the board name */
	strlcpy(ep->name, record->data.board_info.name,
	sizeof(ep->name));
	ti_eeprom_string_cleanup(ep->name);

	/* Populate selected other fields from the board info record */
	strlcpy(ep->version, record->data.board_info.version,
	sizeof(ep->version));
	strlcpy(ep->software_revision,
	record->data.board_info.software_revision,
	sizeof(ep->software_revision));
	strlcpy(ep->serial, record->data.board_info.serial,
	sizeof(ep->serial));
	break;
	case TI_AM6_EEPROM_RECORD_MAC_INFO:
	if (record->header.len != sizeof(record->data.mac_info))
	return -EINVAL;

	if (!mac_addr \|\| !mac_addr_max_cnt)
	break;

	*mac_addr_cnt = ((record->data.mac_info.mac_control &
	TI_AM6_EEPROM_MAC_ADDR_COUNT_MASK) >>
	TI_AM6_EEPROM_MAC_ADDR_COUNT_SHIFT) + 1;

	/*
	* The EEPROM can (but may not) hold a very large amount
	* of MAC addresses, by far exceeding what we want/can store
	* in the common memory array, so only grab what we can fit.
	* Note that a value of 0 means 1 MAC address, and so on.
	*/
	mac_addr_cnt = min(mac_addr_cnt, mac_addr_max_cnt);

	memcpy(mac_addr, record->data.mac_info.mac_addr,
	mac_addr_cnt TI_EEPROM_HDR_ETH_ALEN);
	break;
	case 0x00:
	/* Illegal value... Fall through... */
	case 0xFF:
	/* Illegal value... Something went horribly wrong... */
	return -EINVAL;
	default:
	pr_warn("%s: Ignoring record id %u\n", __func__,
	record->header.id);
	}

	return 0;
	}

	int __maybe_unused ti_i2c_eeprom_am6_get(int bus_addr, int dev_addr,
	struct ti_am6_eeprom *ep,
	char **mac_addr,
	u8 mac_addr_max_cnt,
	u8 *mac_addr_cnt)
	{
	struct udevice *dev;
	struct udevice *bus;
	unsigned int eeprom_addr;
	struct ti_am6_eeprom_record_board_id board_id;
	struct ti_am6_eeprom_record record;
	int rc;

	/* Initialize with a known bad marker for i2c fails.. */
	memset(ep, 0, sizeof(*ep));
	ep->header = TI_DEAD_EEPROM_MAGIC;

	/* Read the board ID record which is always the first EEPROM record */
	rc = ti_i2c_eeprom_get(bus_addr, dev_addr, TI_EEPROM_HEADER_MAGIC,
	sizeof(board_id), (uint8_t *)&board_id);
	if (rc)
	return rc;

	if (board_id.header.id != TI_AM6_EEPROM_RECORD_BOARD_ID) {
	pr_err("%s: Invalid board ID record!\n", __func__);
	return -EINVAL;
	}

	/* Establish DM handle to board config EEPROM */
	rc = uclass_get_device_by_seq(UCLASS_I2C, bus_addr, &bus);
	if (rc)
	return rc;
	rc = i2c_get_chip(bus, dev_addr, 1, &dev);
	if (rc)
	return rc;

	ep->header = TI_EEPROM_HEADER_MAGIC;

	/* Ready to parse TLV structure. Initialize variables... */
	*mac_addr_cnt = 0;

	/*
	* After the all-encompassing board ID record all other records follow
	* a TLV-type scheme. Point to the first such record and then start
	* parsing those one by one.
	*/
	eeprom_addr = sizeof(board_id);

	while (true) {
	rc = dm_i2c_read(dev, eeprom_addr, (uint8_t *)&record.header,
	sizeof(record.header));
	if (rc)
	return rc;

	/*
	* Check for end of list marker. If we reached it don't go
	* any further and stop parsing right here.
	*/
	if (record.header.id == TI_AM6_EEPROM_RECORD_END_LIST)
	break;

	eeprom_addr += sizeof(record.header);

	debug("%s: dev_addr=0x%02x header.id=%u header.len=%u\n",
	__func__, dev_addr, record.header.id,
	record.header.len);

	/* Read record into memory if it fits */
	if (record.header.len <= sizeof(record.data)) {
	rc = dm_i2c_read(dev, eeprom_addr,
	(uint8_t *)&record.data,
	record.header.len);
	if (rc)
	return rc;

	/* Process record */
	rc = ti_i2c_eeprom_am6_parse_record(&record, ep,
	mac_addr,
	mac_addr_max_cnt,
	mac_addr_cnt);
	if (rc) {
	pr_err("%s: EEPROM parsing error!\n", __func__);
	return rc;
	}
	} else {
	/*
	* We may get here in case of larger records which
	* are not yet understood.
	*/
	pr_err("%s: Ignoring record id %u\n", __func__,
	record.header.id);
	}

	eeprom_addr += record.header.len;
	}

	return 0;
	}

	int __maybe_unused ti_i2c_eeprom_am6_get_base(int bus_addr, int dev_addr)
	{
	struct ti_am6_eeprom *ep = TI_AM6_EEPROM_DATA;
	int ret;

	/*
	* Always execute EEPROM read by not allowing to bypass it during the
	* first invocation of SPL which happens on the R5 core.
	*/
	#if !(defined(CONFIG_SPL_BUILD) && defined(CONFIG_CPU_V7R))
	if (ep->header == TI_EEPROM_HEADER_MAGIC) {
	debug("%s: EEPROM has already been read\n", __func__);
	return 0;
	}
	#endif

	ret = ti_i2c_eeprom_am6_get(bus_addr, dev_addr, ep,
	(char **)ep->mac_addr,
	AM6_EEPROM_HDR_NO_OF_MAC_ADDR,
	&ep->mac_addr_cnt);
	return ret;
	}

	bool __maybe_unused board_ti_is(char *name_tag)
	{
	struct ti_common_eeprom *ep = TI_EEPROM_DATA;

	if (ep->header == TI_DEAD_EEPROM_MAGIC)
	return false;
	return !strncmp(ep->name, name_tag, TI_EEPROM_HDR_NAME_LEN);
	}

	bool __maybe_unused board_ti_rev_is(char *rev_tag, int cmp_len)
	{
	struct ti_common_eeprom *ep = TI_EEPROM_DATA;
	int l;

	if (ep->header == TI_DEAD_EEPROM_MAGIC)
	return false;

	l = cmp_len > TI_EEPROM_HDR_REV_LEN ? TI_EEPROM_HDR_REV_LEN : cmp_len;
	return !strncmp(ep->version, rev_tag, l);
	}

	char * __maybe_unused board_ti_get_rev(void)
	{
	struct ti_common_eeprom *ep = TI_EEPROM_DATA;

	/* if ep->header == TI_DEAD_EEPROM_MAGIC, this is empty already */
	return ep->version;
	}

	char * __maybe_unused board_ti_get_config(void)
	{
	struct ti_common_eeprom *ep = TI_EEPROM_DATA;

	/* if ep->header == TI_DEAD_EEPROM_MAGIC, this is empty already */
	return ep->config;
	}

	char * __maybe_unused board_ti_get_name(void)
	{
	struct ti_common_eeprom *ep = TI_EEPROM_DATA;

	/* if ep->header == TI_DEAD_EEPROM_MAGIC, this is empty already */
	return ep->name;
	}

	void __maybe_unused
	board_ti_get_eth_mac_addr(int index,
	u8 mac_addr[TI_EEPROM_HDR_ETH_ALEN])
	{
	struct ti_common_eeprom *ep = TI_EEPROM_DATA;

	if (ep->header == TI_DEAD_EEPROM_MAGIC)
	goto fail;

	if (index < 0 \|\| index >= TI_EEPROM_HDR_NO_OF_MAC_ADDR)
	goto fail;

	memcpy(mac_addr, ep->mac_addr[index], TI_EEPROM_HDR_ETH_ALEN);
	return;

	fail:
	memset(mac_addr, 0, TI_EEPROM_HDR_ETH_ALEN);
	}

	void __maybe_unused
	board_ti_am6_get_eth_mac_addr(int index,
	u8 mac_addr[TI_EEPROM_HDR_ETH_ALEN])
	{
	struct ti_am6_eeprom *ep = TI_AM6_EEPROM_DATA;

	if (ep->header == TI_DEAD_EEPROM_MAGIC)
	goto fail;

	if (index < 0 \|\| index >= ep->mac_addr_cnt)
	goto fail;

	memcpy(mac_addr, ep->mac_addr[index], TI_EEPROM_HDR_ETH_ALEN);
	return;

	fail:
	memset(mac_addr, 0, TI_EEPROM_HDR_ETH_ALEN);
	}

	u64 __maybe_unused board_ti_get_emif1_size(void)
	{
	struct ti_common_eeprom *ep = TI_EEPROM_DATA;

	if (ep->header != DRA7_EEPROM_HEADER_MAGIC)
	return 0;

	return ep->emif1_size;
	}

	u64 __maybe_unused board_ti_get_emif2_size(void)
	{
	struct ti_common_eeprom *ep = TI_EEPROM_DATA;

	if (ep->header != DRA7_EEPROM_HEADER_MAGIC)
	return 0;

	return ep->emif2_size;
	}

	void __maybe_unused set_board_info_env(char *name)
	{
	char *unknown = "unknown";
	struct ti_common_eeprom *ep = TI_EEPROM_DATA;

	if (name)
	env_set("board_name", name);
	else if (ep->name)
	env_set("board_name", ep->name);
	else
	env_set("board_name", unknown);

	if (ep->version)
	env_set("board_rev", ep->version);
	else
	env_set("board_rev", unknown);

	if (ep->serial)
	env_set("board_serial", ep->serial);
	else
	env_set("board_serial", unknown);
	}

	void __maybe_unused set_board_info_env_am6(char *name)
	{
	char *unknown = "unknown";
	struct ti_am6_eeprom *ep = TI_AM6_EEPROM_DATA;

	if (name)
	env_set("board_name", name);
	else if (ep->name)
	env_set("board_name", ep->name);
	else
	env_set("board_name", unknown);

	if (ep->version)
	env_set("board_rev", ep->version);
	else
	env_set("board_rev", unknown);

	if (ep->software_revision)
	env_set("board_software_revision", ep->software_revision);
	else
	env_set("board_software_revision", unknown);

	if (ep->serial)
	env_set("board_serial", ep->serial);
	else
	env_set("board_serial", unknown);
	}

	static u64 mac_to_u64(u8 mac[6])
	{
	int i;
	u64 addr = 0;

	for (i = 0; i < 6; i++) {
	addr <<= 8;
	addr \|= mac[i];
	}

	return addr;
	}

	static void u64_to_mac(u64 addr, u8 mac[6])
	{
	mac[5] = addr;
	mac[4] = addr >> 8;
	mac[3] = addr >> 16;
	mac[2] = addr >> 24;
	mac[1] = addr >> 32;
	mac[0] = addr >> 40;
	}

	void board_ti_set_ethaddr(int index)
	{
	uint8_t mac_addr[6];
	int i;
	u64 mac1, mac2;
	u8 mac_addr1[6], mac_addr2[6];
	int num_macs;
	/*
	* Export any Ethernet MAC addresses from EEPROM.
	* The 2 MAC addresses in EEPROM define the address range.
	*/
	board_ti_get_eth_mac_addr(0, mac_addr1);
	board_ti_get_eth_mac_addr(1, mac_addr2);

	if (is_valid_ethaddr(mac_addr1) && is_valid_ethaddr(mac_addr2)) {
	mac1 = mac_to_u64(mac_addr1);
	mac2 = mac_to_u64(mac_addr2);

	/* must contain an address range */
	num_macs = mac2 - mac1 + 1;
	if (num_macs <= 0)
	return;

	if (num_macs > 50) {
	printf("%s: Too many MAC addresses: %d. Limiting to 50\n",
	__func__, num_macs);
	num_macs = 50;
	}

	for (i = 0; i < num_macs; i++) {
	u64_to_mac(mac1 + i, mac_addr);
	if (is_valid_ethaddr(mac_addr)) {
	eth_env_set_enetaddr_by_index("eth", i + index,
	mac_addr);
	}
	}
	}
	}

	void board_ti_am6_set_ethaddr(int index, int count)
	{
	u8 mac_addr[6];
	int i;

	for (i = 0; i < count; i++) {
	board_ti_am6_get_eth_mac_addr(i, mac_addr);
	if (is_valid_ethaddr(mac_addr))
	eth_env_set_enetaddr_by_index("eth", i + index,
	mac_addr);
	}
	}

	bool __maybe_unused board_ti_was_eeprom_read(void)
	{
	struct ti_common_eeprom *ep = TI_EEPROM_DATA;

	if (ep->header == TI_EEPROM_HEADER_MAGIC)
	return true;
	else
	return false;
	}