u-boot/cmd/eeprom.c

5  * SPDX-License-Identifier:	GPL-2.0+
9  * Support for read and write access to EEPROM like memory devices. This
10  * includes regular EEPROM as well as  FRAM (ferroelectic nonvolaile RAM).
11  * FRAM devices read and write data at bus speed. In particular, there is no
12  * write delay. Also, there is no limit imposed on the number of bytes that can
15  * Use the following configuration options to ensure no unneeded performance
16  * degradation (typical for EEPROM) is incured for FRAM memory:
46 #define	EEPROM_PAGE_OFFSET(x)	((x) & (EEPROM_PAGE_SIZE - 1))
49  * for CONFIG_SYS_I2C_EEPROM_ADDR_LEN == 2 (16-bit EEPROM address) offset is
50  *   0x000nxxxx for EEPROM address selectors at n, offset xxxx in EEPROM.
52  * for CONFIG_SYS_I2C_EEPROM_ADDR_LEN == 1 (8-bit EEPROM page address) offset is
53  *   0x00000nxx for EEPROM address selectors and page number at n.
70 	/* SPI EEPROM */  in eeprom_init()
75 	/* I2C EEPROM */  in eeprom_init()
107 	unsigned len = end - offset;  in eeprom_len()
110 	 * For a FRAM device there is no limit on the number of the  in eeprom_len()
116 	unsigned maxlen = EEPROM_PAGE_SIZE - EEPROM_PAGE_OFFSET(blk_off);  in eeprom_len()
146 		ret = i2c_read(addr[0], offset, alen - 1, buffer, len);  in eeprom_rw_block()
148 		ret = i2c_write(addr[0], offset, alen - 1, buffer, len);  in eeprom_rw_block()
214 	return (*endptr != '\0') ? -1 : value;  in parse_numeric_param()
218  * parse_i2c_bus_addr - parse the i2c bus and i2c devaddr parameters
236 		*i2c_bus = -1;  in parse_i2c_bus_addr()
243 		*i2c_bus = -1;  in parse_i2c_bus_addr()
346 #define NEXT_PARAM(argc, index)	{ (argc)--; (index)++; }
351 	int i2c_bus = -1, index = 0;  in do_eeprom()
352 	ulong i2c_addr = -1, addr = 0, cnt = 0, off = 0;  in do_eeprom()
370 		if (!strcmp(argv[index], "-l")) {  in do_eeprom()
400 	while (ret--)  in do_eeprom()
425 	eeprom,	8,	1,	do_eeprom,
426 	"EEPROM sub-system",
428 	"eeprom write <bus> <devaddr> addr off cnt\n"
429 	"       - read/write `cnt' bytes from `devaddr` EEPROM at offset `off'"
432 	"eeprom print [-l <layout_version>] <bus> <devaddr>\n"
433 	"       - Print layout fields and their data in human readable format\n"
434 	"eeprom update [-l <layout_version>] <bus> <devaddr> field_name field_value\n"
435 	"       - Update a specific eeprom field with new data.\n"
439 …"The -l option can be used to force the command to interpret the EEPROM data using the chosen layo…
440 …"If the -l option is omitted, the command will auto detect the layout based on the data in the EEP…
441 	"The values which can be provided with the -l option are:\n"