2 * (C) Copyright 2000, 2001
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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
13 * be transferred with a single read or write.
15 * Use the following configuration options to ensure no unneeded performance
16 * degradation (typical for EEPROM) is incured for FRAM memory:
18 * #define CONFIG_SYS_I2C_FRAM
19 * #undef CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS
27 #include <eeprom_layout.h>
29 #ifndef CONFIG_SYS_I2C_SPEED
30 #define CONFIG_SYS_I2C_SPEED 50000
33 #ifndef CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS
34 #define CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS 0
37 #ifndef CONFIG_SYS_EEPROM_PAGE_WRITE_BITS
38 #define CONFIG_SYS_EEPROM_PAGE_WRITE_BITS 8
42 #define I2C_RXTX_LEN 128
45 #define EEPROM_PAGE_SIZE (1 << CONFIG_SYS_EEPROM_PAGE_WRITE_BITS)
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.
55 #if !defined(CONFIG_SPI) || defined(CONFIG_ENV_EEPROM_IS_ON_I2C)
56 #if !defined(CONFIG_SYS_I2C_EEPROM_ADDR_LEN) || \
57 (CONFIG_SYS_I2C_EEPROM_ADDR_LEN < 1) || \
58 (CONFIG_SYS_I2C_EEPROM_ADDR_LEN > 2)
59 #error CONFIG_SYS_I2C_EEPROM_ADDR_LEN must be 1 or 2
63 __weak
int eeprom_write_enable(unsigned dev_addr
, int state
)
68 void eeprom_init(int bus
)
71 #if defined(CONFIG_SPI) && !defined(CONFIG_ENV_EEPROM_IS_ON_I2C)
76 #if defined(CONFIG_SYS_I2C)
79 i2c_init(CONFIG_SYS_I2C_SPEED
, CONFIG_SYS_I2C_SLAVE
);
83 static int eeprom_addr(unsigned dev_addr
, unsigned offset
, uchar
*addr
)
88 blk_off
= offset
& 0xff; /* block offset */
89 #if CONFIG_SYS_I2C_EEPROM_ADDR_LEN == 1
90 addr
[0] = offset
>> 8; /* block number */
91 addr
[1] = blk_off
; /* block offset */
94 addr
[0] = offset
>> 16; /* block number */
95 addr
[1] = offset
>> 8; /* upper address octet */
96 addr
[2] = blk_off
; /* lower address octet */
98 #endif /* CONFIG_SYS_I2C_EEPROM_ADDR_LEN */
100 addr
[0] |= dev_addr
; /* insert device address */
105 static int eeprom_len(unsigned offset
, unsigned end
)
107 unsigned len
= end
- offset
;
110 * For a FRAM device there is no limit on the number of the
111 * bytes that can be ccessed with the single read or write
114 #if !defined(CONFIG_SYS_I2C_FRAM)
115 unsigned blk_off
= offset
& 0xff;
116 unsigned maxlen
= EEPROM_PAGE_SIZE
- EEPROM_PAGE_OFFSET(blk_off
);
118 if (maxlen
> I2C_RXTX_LEN
)
119 maxlen
= I2C_RXTX_LEN
;
128 static int eeprom_rw_block(unsigned offset
, uchar
*addr
, unsigned alen
,
129 uchar
*buffer
, unsigned len
, bool read
)
134 #if defined(CONFIG_SPI) && !defined(CONFIG_ENV_EEPROM_IS_ON_I2C)
136 spi_read(addr
, alen
, buffer
, len
);
138 spi_write(addr
, alen
, buffer
, len
);
141 #if defined(CONFIG_SYS_I2C_EEPROM_BUS)
142 i2c_set_bus_num(CONFIG_SYS_I2C_EEPROM_BUS
);
146 ret
= i2c_read(addr
[0], offset
, alen
- 1, buffer
, len
);
148 ret
= i2c_write(addr
[0], offset
, alen
- 1, buffer
, len
);
156 static int eeprom_rw(unsigned dev_addr
, unsigned offset
, uchar
*buffer
,
157 unsigned cnt
, bool read
)
159 unsigned end
= offset
+ cnt
;
164 while (offset
< end
) {
165 alen
= eeprom_addr(dev_addr
, offset
, addr
);
167 len
= eeprom_len(offset
, end
);
169 rcode
= eeprom_rw_block(offset
, addr
, alen
, buffer
, len
, read
);
175 udelay(CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS
* 1000);
181 int eeprom_read(unsigned dev_addr
, unsigned offset
, uchar
*buffer
, unsigned cnt
)
184 * Read data until done or would cross a page boundary.
185 * We must write the address again when changing pages
186 * because the next page may be in a different device.
188 return eeprom_rw(dev_addr
, offset
, buffer
, cnt
, 1);
191 int eeprom_write(unsigned dev_addr
, unsigned offset
,
192 uchar
*buffer
, unsigned cnt
)
196 eeprom_write_enable(dev_addr
, 1);
199 * Write data until done or would cross a write page boundary.
200 * We must write the address again when changing pages
201 * because the address counter only increments within a page.
203 ret
= eeprom_rw(dev_addr
, offset
, buffer
, cnt
, 0);
205 eeprom_write_enable(dev_addr
, 0);
209 static int parse_numeric_param(char *str
)
212 int value
= simple_strtol(str
, &endptr
, 16);
214 return (*endptr
!= '\0') ? -1 : value
;
218 * parse_i2c_bus_addr - parse the i2c bus and i2c devaddr parameters
220 * @i2c_bus: address to store the i2c bus
221 * @i2c_addr: address to store the device i2c address
222 * @argc: count of command line arguments left to parse
223 * @argv: command line arguments left to parse
224 * @argc_no_bus_addr: argc value we expect to see when bus & addr aren't given
226 * @returns: number of arguments parsed or CMD_RET_USAGE if error
228 static int parse_i2c_bus_addr(int *i2c_bus
, ulong
*i2c_addr
, int argc
,
229 char * const argv
[], int argc_no_bus_addr
)
231 int argc_no_bus
= argc_no_bus_addr
+ 1;
232 int argc_bus_addr
= argc_no_bus_addr
+ 2;
234 #ifdef CONFIG_SYS_DEF_EEPROM_ADDR
235 if (argc
== argc_no_bus_addr
) {
237 *i2c_addr
= CONFIG_SYS_DEF_EEPROM_ADDR
;
242 if (argc
== argc_no_bus
) {
244 *i2c_addr
= parse_numeric_param(argv
[0]);
249 if (argc
== argc_bus_addr
) {
250 *i2c_bus
= parse_numeric_param(argv
[0]);
251 *i2c_addr
= parse_numeric_param(argv
[1]);
256 return CMD_RET_USAGE
;
259 #ifdef CONFIG_CMD_EEPROM_LAYOUT
261 __weak
int eeprom_parse_layout_version(char *str
)
263 return LAYOUT_VERSION_UNRECOGNIZED
;
266 static unsigned char eeprom_buf
[CONFIG_SYS_EEPROM_SIZE
];
275 EEPROM_ACTION_INVALID
,
278 static enum eeprom_action
parse_action(char *cmd
)
280 if (!strncmp(cmd
, "read", 4))
282 if (!strncmp(cmd
, "write", 5))
284 #ifdef CONFIG_CMD_EEPROM_LAYOUT
285 if (!strncmp(cmd
, "print", 5))
287 if (!strncmp(cmd
, "update", 6))
288 return EEPROM_UPDATE
;
291 return EEPROM_ACTION_INVALID
;
294 static int eeprom_execute_command(enum eeprom_action action
, int i2c_bus
,
295 ulong i2c_addr
, int layout_ver
, char *key
,
296 char *value
, ulong addr
, ulong off
, ulong cnt
)
299 const char *const fmt
=
300 "\nEEPROM @0x%lX %s: addr %08lx off %04lx count %ld ... ";
301 #ifdef CONFIG_CMD_EEPROM_LAYOUT
302 struct eeprom_layout layout
;
305 if (action
== EEPROM_ACTION_INVALID
)
306 return CMD_RET_USAGE
;
308 eeprom_init(i2c_bus
);
309 if (action
== EEPROM_READ
) {
310 printf(fmt
, i2c_addr
, "read", addr
, off
, cnt
);
312 rcode
= eeprom_read(i2c_addr
, off
, (uchar
*)addr
, cnt
);
316 } else if (action
== EEPROM_WRITE
) {
317 printf(fmt
, i2c_addr
, "write", addr
, off
, cnt
);
319 rcode
= eeprom_write(i2c_addr
, off
, (uchar
*)addr
, cnt
);
325 #ifdef CONFIG_CMD_EEPROM_LAYOUT
326 rcode
= eeprom_read(i2c_addr
, 0, eeprom_buf
, CONFIG_SYS_EEPROM_SIZE
);
330 eeprom_layout_setup(&layout
, eeprom_buf
, CONFIG_SYS_EEPROM_SIZE
,
333 if (action
== EEPROM_PRINT
) {
334 layout
.print(&layout
);
338 layout
.update(&layout
, key
, value
);
340 rcode
= eeprom_write(i2c_addr
, 0, layout
.data
, CONFIG_SYS_EEPROM_SIZE
);
346 #define NEXT_PARAM(argc, index) { (argc)--; (index)++; }
347 int do_eeprom(cmd_tbl_t
*cmdtp
, int flag
, int argc
, char * const argv
[])
349 int layout_ver
= LAYOUT_VERSION_AUTODETECT
;
350 enum eeprom_action action
= EEPROM_ACTION_INVALID
;
351 int i2c_bus
= -1, index
= 0;
352 ulong i2c_addr
= -1, addr
= 0, cnt
= 0, off
= 0;
354 char *field_name
= "";
355 char *field_value
= "";
358 return CMD_RET_USAGE
;
360 NEXT_PARAM(argc
, index
); /* Skip program name */
362 action
= parse_action(argv
[index
]);
363 NEXT_PARAM(argc
, index
);
365 if (action
== EEPROM_ACTION_INVALID
)
366 return CMD_RET_USAGE
;
368 #ifdef CONFIG_CMD_EEPROM_LAYOUT
369 if (action
== EEPROM_PRINT
|| action
== EEPROM_UPDATE
) {
370 if (!strcmp(argv
[index
], "-l")) {
371 NEXT_PARAM(argc
, index
);
372 layout_ver
= eeprom_parse_layout_version(argv
[index
]);
373 NEXT_PARAM(argc
, index
);
381 ret
= parse_i2c_bus_addr(&i2c_bus
, &i2c_addr
, argc
,
385 ret
= parse_i2c_bus_addr(&i2c_bus
, &i2c_addr
, argc
,
389 ret
= parse_i2c_bus_addr(&i2c_bus
, &i2c_addr
, argc
,
393 /* Get compiler to stop whining */
394 return CMD_RET_USAGE
;
397 if (ret
== CMD_RET_USAGE
)
401 NEXT_PARAM(argc
, index
);
403 if (action
== EEPROM_READ
|| action
== EEPROM_WRITE
) {
404 addr
= parse_numeric_param(argv
[index
]);
405 NEXT_PARAM(argc
, index
);
406 off
= parse_numeric_param(argv
[index
]);
407 NEXT_PARAM(argc
, index
);
408 cnt
= parse_numeric_param(argv
[index
]);
411 #ifdef CONFIG_CMD_EEPROM_LAYOUT
412 if (action
== EEPROM_UPDATE
) {
413 field_name
= argv
[index
];
414 NEXT_PARAM(argc
, index
);
415 field_value
= argv
[index
];
416 NEXT_PARAM(argc
, index
);
420 return eeprom_execute_command(action
, i2c_bus
, i2c_addr
, layout_ver
,
421 field_name
, field_value
, addr
, off
, cnt
);
425 eeprom
, 8, 1, do_eeprom
,
427 "read <bus> <devaddr> addr off cnt\n"
428 "eeprom write <bus> <devaddr> addr off cnt\n"
429 " - read/write `cnt' bytes from `devaddr` EEPROM at offset `off'"
430 #ifdef CONFIG_CMD_EEPROM_LAYOUT
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"
436 " The new data must be written in the same human readable format as shown by the print command.\n"
439 "The -l option can be used to force the command to interpret the EEPROM data using the chosen layout.\n"
440 "If the -l option is omitted, the command will auto detect the layout based on the data in the EEPROM.\n"
441 "The values which can be provided with the -l option are:\n"
442 CONFIG_EEPROM_LAYOUT_HELP_STRING
"\n"