1 // SPDX-License-Identifier: GPL-2.0+
6 * Changes for unified multibus/multiadapter I2C support.
13 * I2C Functions similar to the standard memory functions.
15 * There are several parameters in many of the commands that bear further
18 * {i2c_chip} is the I2C chip address (the first byte sent on the bus).
19 * Each I2C chip on the bus has a unique address. On the I2C data bus,
20 * the address is the upper seven bits and the LSB is the "read/write"
21 * bit. Note that the {i2c_chip} address specified on the command
22 * line is not shifted up: e.g. a typical EEPROM memory chip may have
23 * an I2C address of 0x50, but the data put on the bus will be 0xA0
24 * for write and 0xA1 for read. This "non shifted" address notation
25 * matches at least half of the data sheets :-/.
27 * {addr} is the address (or offset) within the chip. Small memory
28 * chips have 8 bit addresses. Large memory chips have 16 bit
29 * addresses. Other memory chips have 9, 10, or 11 bit addresses.
30 * Many non-memory chips have multiple registers and {addr} is used
31 * as the register index. Some non-memory chips have only one register
32 * and therefore don't need any {addr} parameter.
34 * The default {addr} parameter is one byte (.1) which works well for
35 * memories and registers with 8 bits of address space.
37 * You can specify the length of the {addr} field with the optional .0,
38 * .1, or .2 modifier (similar to the .b, .w, .l modifier). If you are
39 * manipulating a single register device which doesn't use an address
40 * field, use "0.0" for the address and the ".0" length field will
41 * suppress the address in the I2C data stream. This also works for
42 * successive reads using the I2C auto-incrementing memory pointer.
44 * If you are manipulating a large memory with 2-byte addresses, use
45 * the .2 address modifier, e.g. 210.2 addresses location 528 (decimal).
47 * Then there are the unfortunate memory chips that spill the most
48 * significant 1, 2, or 3 bits of address into the chip address byte.
49 * This effectively makes one chip (logically) look like 2, 4, or
50 * 8 chips. This is handled (awkwardly) by #defining
51 * CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW and using the .1 modifier on the
52 * {addr} field (since .1 is the default, it doesn't actually have to
53 * be specified). Examples: given a memory chip at I2C chip address
54 * 0x50, the following would happen...
55 * i2c md 50 0 10 display 16 bytes starting at 0x000
56 * On the bus: <S> A0 00 <E> <S> A1 <rd> ... <rd>
57 * i2c md 50 100 10 display 16 bytes starting at 0x100
58 * On the bus: <S> A2 00 <E> <S> A3 <rd> ... <rd>
59 * i2c md 50 210 10 display 16 bytes starting at 0x210
60 * On the bus: <S> A4 10 <E> <S> A5 <rd> ... <rd>
61 * This is awfully ugly. It would be nice if someone would think up
62 * a better way of handling this.
67 #include <bootretry.h>
77 #include <asm/byteorder.h>
78 #include <linux/compiler.h>
79 #include <linux/delay.h>
80 #include <u-boot/crc.h>
82 /* Display values from last command.
83 * Memory modify remembered values are different from display memory.
85 static uint i2c_dp_last_chip;
86 static uint i2c_dp_last_addr;
87 static uint i2c_dp_last_alen;
88 static uint i2c_dp_last_length = 0x10;
90 static uint i2c_mm_last_chip;
91 static uint i2c_mm_last_addr;
92 static uint i2c_mm_last_alen;
94 /* If only one I2C bus is present, the list of devices to ignore when
95 * the probe command is issued is represented by a 1D array of addresses.
96 * When multiple buses are present, the list is an array of bus-address
97 * pairs. The following macros take care of this */
99 #if defined(CFG_SYS_I2C_NOPROBES)
100 #if CONFIG_IS_ENABLED(SYS_I2C_LEGACY)
105 } i2c_no_probes[] = CFG_SYS_I2C_NOPROBES;
106 #define GET_BUS_NUM i2c_get_bus_num()
107 #define COMPARE_BUS(b,i) (i2c_no_probes[(i)].bus == (b))
108 #define COMPARE_ADDR(a,i) (i2c_no_probes[(i)].addr == (a))
109 #define NO_PROBE_ADDR(i) i2c_no_probes[(i)].addr
110 #else /* single bus */
111 static uchar i2c_no_probes[] = CFG_SYS_I2C_NOPROBES;
112 #define GET_BUS_NUM 0
113 #define COMPARE_BUS(b,i) ((b) == 0) /* Make compiler happy */
114 #define COMPARE_ADDR(a,i) (i2c_no_probes[(i)] == (a))
115 #define NO_PROBE_ADDR(i) i2c_no_probes[(i)]
116 #endif /* CONFIG_IS_ENABLED(SYS_I2C_LEGACY) */
119 #define DISP_LINE_LEN 16
122 * Default for driver model is to use the chip's existing address length.
123 * For legacy code, this is not stored, so we need to use a suitable
126 #if CONFIG_IS_ENABLED(DM_I2C)
127 #define DEFAULT_ADDR_LEN (-1)
129 #define DEFAULT_ADDR_LEN 1
132 #if CONFIG_IS_ENABLED(DM_I2C)
133 static struct udevice *i2c_cur_bus;
135 static int cmd_i2c_set_bus_num(unsigned int busnum)
140 ret = uclass_get_device_by_seq(UCLASS_I2C, busnum, &bus);
142 debug("%s: No bus %d\n", __func__, busnum);
150 static int i2c_get_cur_bus(struct udevice **busp)
152 #ifdef CONFIG_I2C_SET_DEFAULT_BUS_NUM
154 if (cmd_i2c_set_bus_num(CONFIG_I2C_DEFAULT_BUS_NUMBER)) {
155 printf("Default I2C bus %d not found\n",
156 CONFIG_I2C_DEFAULT_BUS_NUMBER);
163 puts("No I2C bus selected\n");
171 static int i2c_get_cur_bus_chip(uint chip_addr, struct udevice **devp)
176 ret = i2c_get_cur_bus(&bus);
180 return i2c_get_chip(bus, chip_addr, 1, devp);
186 * i2c_init_board() - Board-specific I2C bus init
188 * This function is the default no-op implementation of I2C bus
189 * initialization. This function can be overridden by board-specific
190 * implementation if needed.
193 void i2c_init_board(void)
198 * get_alen() - Small parser helper function to get address length
200 * Returns the address length.
202 static uint get_alen(char *arg, int default_len)
208 for (j = 0; j < 8; j++) {
210 alen = arg[j+1] - '0';
212 } else if (arg[j] == '\0')
223 static int i2c_report_err(int ret, enum i2c_err_op op)
225 printf("Error %s the chip: %d\n",
226 op == I2C_ERR_READ ? "reading" : "writing", ret);
228 return CMD_RET_FAILURE;
232 * do_i2c_read() - Handle the "i2c read" command-line command
233 * @cmdtp: Command data struct pointer
234 * @flag: Command flag
235 * @argc: Command-line argument count
236 * @argv: Array of command-line arguments
238 * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
242 * i2c read {i2c_chip} {devaddr}{.0, .1, .2} {len} {memaddr}
244 static int do_i2c_read(struct cmd_tbl *cmdtp, int flag, int argc,
248 uint devaddr, length;
252 #if CONFIG_IS_ENABLED(DM_I2C)
257 return CMD_RET_USAGE;
262 chip = hextoul(argv[1], NULL);
265 * I2C data address within the chip. This can be 1 or
266 * 2 bytes long. Some day it might be 3 bytes long :-).
268 devaddr = hextoul(argv[2], NULL);
269 alen = get_alen(argv[2], DEFAULT_ADDR_LEN);
271 return CMD_RET_USAGE;
274 * Length is the number of objects, not number of bytes.
276 length = hextoul(argv[3], NULL);
279 * memaddr is the address where to store things in memory
281 memaddr = (u_char *)hextoul(argv[4], NULL);
283 #if CONFIG_IS_ENABLED(DM_I2C)
284 ret = i2c_get_cur_bus_chip(chip, &dev);
285 if (!ret && alen != -1)
286 ret = i2c_set_chip_offset_len(dev, alen);
288 ret = dm_i2c_read(dev, devaddr, memaddr, length);
290 ret = i2c_read(chip, devaddr, alen, memaddr, length);
293 return i2c_report_err(ret, I2C_ERR_READ);
298 static int do_i2c_write(struct cmd_tbl *cmdtp, int flag, int argc,
302 uint devaddr, length;
306 #if CONFIG_IS_ENABLED(DM_I2C)
308 struct dm_i2c_chip *i2c_chip;
311 if ((argc < 5) || (argc > 6))
312 return cmd_usage(cmdtp);
315 * memaddr is the address where to store things in memory
317 memaddr = (u_char *)hextoul(argv[1], NULL);
322 chip = hextoul(argv[2], NULL);
325 * I2C data address within the chip. This can be 1 or
326 * 2 bytes long. Some day it might be 3 bytes long :-).
328 devaddr = hextoul(argv[3], NULL);
329 alen = get_alen(argv[3], DEFAULT_ADDR_LEN);
331 return cmd_usage(cmdtp);
334 * Length is the number of bytes.
336 length = hextoul(argv[4], NULL);
338 #if CONFIG_IS_ENABLED(DM_I2C)
339 ret = i2c_get_cur_bus_chip(chip, &dev);
340 if (!ret && alen != -1)
341 ret = i2c_set_chip_offset_len(dev, alen);
343 return i2c_report_err(ret, I2C_ERR_WRITE);
344 i2c_chip = dev_get_parent_plat(dev);
346 return i2c_report_err(ret, I2C_ERR_WRITE);
349 if (argc == 6 && !strcmp(argv[5], "-s")) {
351 * Write all bytes in a single I2C transaction. If the target
352 * device is an EEPROM, it is your responsibility to not cross
353 * a page boundary. No write delay upon completion, take this
354 * into account if linking commands.
356 #if CONFIG_IS_ENABLED(DM_I2C)
357 i2c_chip->flags &= ~DM_I2C_CHIP_WR_ADDRESS;
358 ret = dm_i2c_write(dev, devaddr, memaddr, length);
360 ret = i2c_write(chip, devaddr, alen, memaddr, length);
363 return i2c_report_err(ret, I2C_ERR_WRITE);
366 * Repeated addressing - perform <length> separate
367 * write transactions of one byte each
369 while (length-- > 0) {
370 #if CONFIG_IS_ENABLED(DM_I2C)
371 i2c_chip->flags |= DM_I2C_CHIP_WR_ADDRESS;
372 ret = dm_i2c_write(dev, devaddr++, memaddr++, 1);
374 ret = i2c_write(chip, devaddr++, alen, memaddr++, 1);
377 return i2c_report_err(ret, I2C_ERR_WRITE);
379 * No write delay with FRAM devices.
381 #if !defined(CONFIG_SYS_I2C_FRAM)
389 #if CONFIG_IS_ENABLED(DM_I2C)
390 static int do_i2c_flags(struct cmd_tbl *cmdtp, int flag, int argc,
399 return CMD_RET_USAGE;
401 chip = hextoul(argv[1], NULL);
402 ret = i2c_get_cur_bus_chip(chip, &dev);
404 return i2c_report_err(ret, I2C_ERR_READ);
407 flags = hextoul(argv[2], NULL);
408 ret = i2c_set_chip_flags(dev, flags);
410 ret = i2c_get_chip_flags(dev, &flags);
412 printf("%x\n", flags);
415 return i2c_report_err(ret, I2C_ERR_READ);
420 static int do_i2c_olen(struct cmd_tbl *cmdtp, int flag, int argc,
429 return CMD_RET_USAGE;
431 chip = hextoul(argv[1], NULL);
432 ret = i2c_get_cur_bus_chip(chip, &dev);
434 return i2c_report_err(ret, I2C_ERR_READ);
437 olen = hextoul(argv[2], NULL);
438 ret = i2c_set_chip_offset_len(dev, olen);
440 ret = i2c_get_chip_offset_len(dev);
447 return i2c_report_err(ret, I2C_ERR_READ);
454 * do_i2c_md() - Handle the "i2c md" command-line command
455 * @cmdtp: Command data struct pointer
456 * @flag: Command flag
457 * @argc: Command-line argument count
458 * @argv: Array of command-line arguments
460 * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
464 * i2c md {i2c_chip} {addr}{.0, .1, .2} {len}
466 static int do_i2c_md(struct cmd_tbl *cmdtp, int flag, int argc,
473 uint nbytes, linebytes;
475 #if CONFIG_IS_ENABLED(DM_I2C)
479 /* We use the last specified parameters, unless new ones are
482 chip = i2c_dp_last_chip;
483 addr = i2c_dp_last_addr;
484 alen = i2c_dp_last_alen;
485 length = i2c_dp_last_length;
488 return CMD_RET_USAGE;
490 if ((flag & CMD_FLAG_REPEAT) == 0) {
492 * New command specified.
498 chip = hextoul(argv[1], NULL);
501 * I2C data address within the chip. This can be 1 or
502 * 2 bytes long. Some day it might be 3 bytes long :-).
504 addr = hextoul(argv[2], NULL);
505 alen = get_alen(argv[2], DEFAULT_ADDR_LEN);
507 return CMD_RET_USAGE;
510 * If another parameter, it is the length to display.
511 * Length is the number of objects, not number of bytes.
514 length = hextoul(argv[3], NULL);
517 #if CONFIG_IS_ENABLED(DM_I2C)
518 ret = i2c_get_cur_bus_chip(chip, &dev);
519 if (!ret && alen != -1)
520 ret = i2c_set_chip_offset_len(dev, alen);
522 return i2c_report_err(ret, I2C_ERR_READ);
528 * We buffer all read data, so we can make sure data is read only
533 unsigned char linebuf[DISP_LINE_LEN];
536 linebytes = (nbytes > DISP_LINE_LEN) ? DISP_LINE_LEN : nbytes;
538 #if CONFIG_IS_ENABLED(DM_I2C)
539 ret = dm_i2c_read(dev, addr, linebuf, linebytes);
541 ret = i2c_read(chip, addr, alen, linebuf, linebytes);
544 return i2c_report_err(ret, I2C_ERR_READ);
546 printf("%04x:", addr);
548 for (j=0; j<linebytes; j++) {
549 printf(" %02x", *cp++);
554 for (j=0; j<linebytes; j++) {
555 if ((*cp < 0x20) || (*cp > 0x7e))
564 } while (nbytes > 0);
566 i2c_dp_last_chip = chip;
567 i2c_dp_last_addr = addr;
568 i2c_dp_last_alen = alen;
569 i2c_dp_last_length = length;
575 * do_i2c_mw() - Handle the "i2c mw" command-line command
576 * @cmdtp: Command data struct pointer
577 * @flag: Command flag
578 * @argc: Command-line argument count
579 * @argv: Array of command-line arguments
581 * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
585 * i2c mw {i2c_chip} {addr}{.0, .1, .2} {data} [{count}]
587 static int do_i2c_mw(struct cmd_tbl *cmdtp, int flag, int argc,
596 #if CONFIG_IS_ENABLED(DM_I2C)
600 if ((argc < 4) || (argc > 5))
601 return CMD_RET_USAGE;
604 * Chip is always specified.
606 chip = hextoul(argv[1], NULL);
609 * Address is always specified.
611 addr = hextoul(argv[2], NULL);
612 alen = get_alen(argv[2], DEFAULT_ADDR_LEN);
614 return CMD_RET_USAGE;
616 #if CONFIG_IS_ENABLED(DM_I2C)
617 ret = i2c_get_cur_bus_chip(chip, &dev);
618 if (!ret && alen != -1)
619 ret = i2c_set_chip_offset_len(dev, alen);
621 return i2c_report_err(ret, I2C_ERR_WRITE);
624 * Value to write is always specified.
626 byte = hextoul(argv[3], NULL);
632 count = hextoul(argv[4], NULL);
636 while (count-- > 0) {
637 #if CONFIG_IS_ENABLED(DM_I2C)
638 ret = dm_i2c_write(dev, addr++, &byte, 1);
640 ret = i2c_write(chip, addr++, alen, &byte, 1);
643 return i2c_report_err(ret, I2C_ERR_WRITE);
645 * Wait for the write to complete. The write can take
646 * up to 10mSec (we allow a little more time).
649 * No write delay with FRAM devices.
651 #if !defined(CONFIG_SYS_I2C_FRAM)
660 * do_i2c_crc() - Handle the "i2c crc32" command-line command
661 * @cmdtp: Command data struct pointer
662 * @flag: Command flag
663 * @argc: Command-line argument count
664 * @argv: Array of command-line arguments
666 * Calculate a CRC on memory
668 * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
672 * i2c crc32 {i2c_chip} {addr}{.0, .1, .2} {count}
674 static int do_i2c_crc(struct cmd_tbl *cmdtp, int flag, int argc,
685 #if CONFIG_IS_ENABLED(DM_I2C)
690 return CMD_RET_USAGE;
693 * Chip is always specified.
695 chip = hextoul(argv[1], NULL);
698 * Address is always specified.
700 addr = hextoul(argv[2], NULL);
701 alen = get_alen(argv[2], DEFAULT_ADDR_LEN);
703 return CMD_RET_USAGE;
705 #if CONFIG_IS_ENABLED(DM_I2C)
706 ret = i2c_get_cur_bus_chip(chip, &dev);
707 if (!ret && alen != -1)
708 ret = i2c_set_chip_offset_len(dev, alen);
710 return i2c_report_err(ret, I2C_ERR_READ);
713 * Count is always specified
715 count = hextoul(argv[3], NULL);
717 printf ("CRC32 for %08lx ... %08lx ==> ", addr, addr + count - 1);
719 * CRC a byte at a time. This is going to be slooow, but hey, the
720 * memories are small and slow too so hopefully nobody notices.
724 while (count-- > 0) {
725 #if CONFIG_IS_ENABLED(DM_I2C)
726 ret = dm_i2c_read(dev, addr, &byte, 1);
728 ret = i2c_read(chip, addr, alen, &byte, 1);
732 crc = crc32(crc, &byte, 1);
736 i2c_report_err(ret, I2C_ERR_READ);
738 printf ("%08lx\n", crc);
744 * mod_i2c_mem() - Handle the "i2c mm" and "i2c nm" command-line command
745 * @cmdtp: Command data struct pointer
746 * @flag: Command flag
747 * @argc: Command-line argument count
748 * @argv: Array of command-line arguments
752 * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
756 * i2c mm{.b, .w, .l} {i2c_chip} {addr}{.0, .1, .2}
757 * i2c nm{.b, .w, .l} {i2c_chip} {addr}{.0, .1, .2}
759 static int mod_i2c_mem(struct cmd_tbl *cmdtp, int incrflag, int flag, int argc,
769 #if CONFIG_IS_ENABLED(DM_I2C)
774 return CMD_RET_USAGE;
776 bootretry_reset_cmd_timeout(); /* got a good command to get here */
778 * We use the last specified parameters, unless new ones are
781 chip = i2c_mm_last_chip;
782 addr = i2c_mm_last_addr;
783 alen = i2c_mm_last_alen;
785 if ((flag & CMD_FLAG_REPEAT) == 0) {
787 * New command specified. Check for a size specification.
788 * Defaults to byte if no or incorrect specification.
790 size = cmd_get_data_size(argv[0], 1);
793 * Chip is always specified.
795 chip = hextoul(argv[1], NULL);
798 * Address is always specified.
800 addr = hextoul(argv[2], NULL);
801 alen = get_alen(argv[2], DEFAULT_ADDR_LEN);
803 return CMD_RET_USAGE;
806 #if CONFIG_IS_ENABLED(DM_I2C)
807 ret = i2c_get_cur_bus_chip(chip, &dev);
808 if (!ret && alen != -1)
809 ret = i2c_set_chip_offset_len(dev, alen);
811 return i2c_report_err(ret, I2C_ERR_WRITE);
815 * Print the address, followed by value. Then accept input for
816 * the next value. A non-converted value exits.
819 printf("%08lx:", addr);
820 #if CONFIG_IS_ENABLED(DM_I2C)
821 ret = dm_i2c_read(dev, addr, (uchar *)&data, size);
823 ret = i2c_read(chip, addr, alen, (uchar *)&data, size);
826 return i2c_report_err(ret, I2C_ERR_READ);
828 data = cpu_to_be32(data);
830 printf(" %02lx", (data >> 24) & 0x000000FF);
832 printf(" %04lx", (data >> 16) & 0x0000FFFF);
834 printf(" %08lx", data);
836 nbytes = cli_readline(" ? ");
839 * <CR> pressed as only input, don't modify current
840 * location and move to next.
845 /* good enough to not time out */
846 bootretry_reset_cmd_timeout();
848 #ifdef CONFIG_BOOT_RETRY_TIME
849 else if (nbytes == -2)
850 break; /* timed out, exit the command */
855 data = hextoul(console_buffer, &endp);
860 data = be32_to_cpu(data);
861 nbytes = endp - console_buffer;
864 * good enough to not time out
866 bootretry_reset_cmd_timeout();
867 #if CONFIG_IS_ENABLED(DM_I2C)
868 ret = dm_i2c_write(dev, addr, (uchar *)&data,
871 ret = i2c_write(chip, addr, alen,
872 (uchar *)&data, size);
875 return i2c_report_err(ret,
877 #if CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS > 0
878 udelay(CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS * 1000);
886 i2c_mm_last_chip = chip;
887 i2c_mm_last_addr = addr;
888 i2c_mm_last_alen = alen;
894 * do_i2c_probe() - Handle the "i2c probe" command-line command
895 * @cmdtp: Command data struct pointer
896 * @flag: Command flag
897 * @argc: Command-line argument count
898 * @argv: Array of command-line arguments
900 * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
906 * Returns zero (success) if one or more I2C devices was found
908 static int do_i2c_probe(struct cmd_tbl *cmdtp, int flag, int argc,
914 #if defined(CFG_SYS_I2C_NOPROBES)
916 unsigned int bus = GET_BUS_NUM;
917 #endif /* NOPROBES */
919 #if CONFIG_IS_ENABLED(DM_I2C)
920 struct udevice *bus, *dev;
922 if (i2c_get_cur_bus(&bus))
923 return CMD_RET_FAILURE;
927 addr = simple_strtol(argv[1], 0, 16);
929 puts ("Valid chip addresses:");
930 for (j = 0; j < 128; j++) {
931 if ((0 <= addr) && (j != addr))
934 #if defined(CFG_SYS_I2C_NOPROBES)
936 for (k = 0; k < ARRAY_SIZE(i2c_no_probes); k++) {
937 if (COMPARE_BUS(bus, k) && COMPARE_ADDR(j, k)) {
945 #if CONFIG_IS_ENABLED(DM_I2C)
946 ret = dm_i2c_probe(bus, j, 0, &dev);
957 #if defined(CFG_SYS_I2C_NOPROBES)
958 puts ("Excluded chip addresses:");
959 for (k = 0; k < ARRAY_SIZE(i2c_no_probes); k++) {
960 if (COMPARE_BUS(bus,k))
961 printf(" %02X", NO_PROBE_ADDR(k));
970 * do_i2c_loop() - Handle the "i2c loop" command-line command
971 * @cmdtp: Command data struct pointer
972 * @flag: Command flag
973 * @argc: Command-line argument count
974 * @argv: Array of command-line arguments
976 * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
980 * i2c loop {i2c_chip} {addr}{.0, .1, .2} [{length}] [{delay}]
981 * {length} - Number of bytes to read
982 * {delay} - A DECIMAL number and defaults to 1000 uSec
984 static int do_i2c_loop(struct cmd_tbl *cmdtp, int flag, int argc,
994 #if CONFIG_IS_ENABLED(DM_I2C)
999 return CMD_RET_USAGE;
1002 * Chip is always specified.
1004 chip = hextoul(argv[1], NULL);
1007 * Address is always specified.
1009 addr = hextoul(argv[2], NULL);
1010 alen = get_alen(argv[2], DEFAULT_ADDR_LEN);
1012 return CMD_RET_USAGE;
1013 #if CONFIG_IS_ENABLED(DM_I2C)
1014 ret = i2c_get_cur_bus_chip(chip, &dev);
1015 if (!ret && alen != -1)
1016 ret = i2c_set_chip_offset_len(dev, alen);
1018 return i2c_report_err(ret, I2C_ERR_WRITE);
1022 * Length is the number of objects, not number of bytes.
1025 length = hextoul(argv[3], NULL);
1026 if (length > sizeof(bytes))
1027 length = sizeof(bytes);
1030 * The delay time (uSec) is optional.
1034 delay = dectoul(argv[4], NULL);
1039 #if CONFIG_IS_ENABLED(DM_I2C)
1040 ret = dm_i2c_read(dev, addr, bytes, length);
1042 ret = i2c_read(chip, addr, alen, bytes, length);
1045 i2c_report_err(ret, I2C_ERR_READ);
1054 * The SDRAM command is separately configured because many
1055 * (most?) embedded boards don't use SDRAM DIMMs.
1057 * FIXME: Document and probably move elsewhere!
1059 #if defined(CONFIG_CMD_SDRAM)
1060 static void print_ddr2_tcyc (u_char const b)
1062 printf ("%d.", (b >> 4) & 0x0F);
1074 printf ("%d ns\n", b & 0x0F);
1094 static void decode_bits (u_char const b, char const *str[], int const do_once)
1098 for (mask = 0x80; mask != 0x00; mask >>= 1, ++str) {
1109 * i2c sdram {i2c_chip}
1111 static int do_sdram(struct cmd_tbl *cmdtp, int flag, int argc,
1114 enum { unknown, EDO, SDRAM, DDR, DDR2, DDR3, DDR4 } type;
1120 #if CONFIG_IS_ENABLED(DM_I2C)
1121 struct udevice *dev;
1124 static const char *decode_CAS_DDR2[] = {
1125 " TBD", " 6", " 5", " 4", " 3", " 2", " TBD", " TBD"
1128 static const char *decode_CAS_default[] = {
1129 " TBD", " 7", " 6", " 5", " 4", " 3", " 2", " 1"
1132 static const char *decode_CS_WE_default[] = {
1133 " TBD", " 6", " 5", " 4", " 3", " 2", " 1", " 0"
1136 static const char *decode_byte21_default[] = {
1138 " Redundant row address\n",
1139 " Differential clock input\n",
1140 " Registerd DQMB inputs\n",
1141 " Buffered DQMB inputs\n",
1143 " Registered address/control lines\n",
1144 " Buffered address/control lines\n"
1147 static const char *decode_byte22_DDR2[] = {
1153 " Supports partial array self refresh\n",
1154 " Supports 50 ohm ODT\n",
1155 " Supports weak driver\n"
1158 static const char *decode_row_density_DDR2[] = {
1159 "512 MiB", "256 MiB", "128 MiB", "16 GiB",
1160 "8 GiB", "4 GiB", "2 GiB", "1 GiB"
1163 static const char *decode_row_density_default[] = {
1164 "512 MiB", "256 MiB", "128 MiB", "64 MiB",
1165 "32 MiB", "16 MiB", "8 MiB", "4 MiB"
1169 return CMD_RET_USAGE;
1172 * Chip is always specified.
1174 chip = hextoul(argv[1], NULL);
1176 #if CONFIG_IS_ENABLED(DM_I2C)
1177 ret = i2c_get_cur_bus_chip(chip, &dev);
1179 ret = dm_i2c_read(dev, 0, data, sizeof(data));
1181 ret = i2c_read(chip, 0, 1, data, sizeof(data));
1184 puts ("No SDRAM Serial Presence Detect found.\n");
1189 for (j = 0; j < 63; j++) {
1192 if (cksum != data[63]) {
1193 printf ("WARNING: Configuration data checksum failure:\n"
1194 " is 0x%02x, calculated 0x%02x\n", data[63], cksum);
1196 printf ("SPD data revision %d.%d\n",
1197 (data[62] >> 4) & 0x0F, data[62] & 0x0F);
1198 printf ("Bytes used 0x%02X\n", data[0]);
1199 printf ("Serial memory size 0x%02X\n", 1 << data[1]);
1201 puts ("Memory type ");
1233 puts ("Row address bits ");
1234 if ((data[3] & 0x00F0) == 0)
1235 printf ("%d\n", data[3] & 0x0F);
1237 printf ("%d/%d\n", data[3] & 0x0F, (data[3] >> 4) & 0x0F);
1239 puts ("Column address bits ");
1240 if ((data[4] & 0x00F0) == 0)
1241 printf ("%d\n", data[4] & 0x0F);
1243 printf ("%d/%d\n", data[4] & 0x0F, (data[4] >> 4) & 0x0F);
1247 printf ("Number of ranks %d\n",
1248 (data[5] & 0x07) + 1);
1251 printf ("Module rows %d\n", data[5]);
1257 printf ("Module data width %d bits\n", data[6]);
1260 printf ("Module data width %d bits\n",
1261 (data[7] << 8) | data[6]);
1265 puts ("Interface signal levels ");
1267 case 0: puts ("TTL 5.0 V\n"); break;
1268 case 1: puts ("LVTTL\n"); break;
1269 case 2: puts ("HSTL 1.5 V\n"); break;
1270 case 3: puts ("SSTL 3.3 V\n"); break;
1271 case 4: puts ("SSTL 2.5 V\n"); break;
1272 case 5: puts ("SSTL 1.8 V\n"); break;
1273 default: puts ("unknown\n"); break;
1278 printf ("SDRAM cycle time ");
1279 print_ddr2_tcyc (data[9]);
1282 printf ("SDRAM cycle time %d.%d ns\n",
1283 (data[9] >> 4) & 0x0F, data[9] & 0x0F);
1289 printf ("SDRAM access time 0.%d%d ns\n",
1290 (data[10] >> 4) & 0x0F, data[10] & 0x0F);
1293 printf ("SDRAM access time %d.%d ns\n",
1294 (data[10] >> 4) & 0x0F, data[10] & 0x0F);
1298 puts ("EDC configuration ");
1300 case 0: puts ("None\n"); break;
1301 case 1: puts ("Parity\n"); break;
1302 case 2: puts ("ECC\n"); break;
1303 default: puts ("unknown\n"); break;
1306 if ((data[12] & 0x80) == 0)
1307 puts ("No self refresh, rate ");
1309 puts ("Self refresh, rate ");
1311 switch(data[12] & 0x7F) {
1312 case 0: puts ("15.625 us\n"); break;
1313 case 1: puts ("3.9 us\n"); break;
1314 case 2: puts ("7.8 us\n"); break;
1315 case 3: puts ("31.3 us\n"); break;
1316 case 4: puts ("62.5 us\n"); break;
1317 case 5: puts ("125 us\n"); break;
1318 default: puts ("unknown\n"); break;
1323 printf ("SDRAM width (primary) %d\n", data[13]);
1326 printf ("SDRAM width (primary) %d\n", data[13] & 0x7F);
1327 if ((data[13] & 0x80) != 0) {
1328 printf (" (second bank) %d\n",
1329 2 * (data[13] & 0x7F));
1337 printf ("EDC width %d\n", data[14]);
1340 if (data[14] != 0) {
1341 printf ("EDC width %d\n",
1344 if ((data[14] & 0x80) != 0) {
1345 printf (" (second bank) %d\n",
1346 2 * (data[14] & 0x7F));
1353 printf ("Min clock delay, back-to-back random column addresses "
1357 puts ("Burst length(s) ");
1358 if (data[16] & 0x80) puts (" Page");
1359 if (data[16] & 0x08) puts (" 8");
1360 if (data[16] & 0x04) puts (" 4");
1361 if (data[16] & 0x02) puts (" 2");
1362 if (data[16] & 0x01) puts (" 1");
1364 printf ("Number of banks %d\n", data[17]);
1368 puts ("CAS latency(s) ");
1369 decode_bits (data[18], decode_CAS_DDR2, 0);
1373 puts ("CAS latency(s) ");
1374 decode_bits (data[18], decode_CAS_default, 0);
1380 puts ("CS latency(s) ");
1381 decode_bits (data[19], decode_CS_WE_default, 0);
1386 puts ("WE latency(s) ");
1387 decode_bits (data[20], decode_CS_WE_default, 0);
1393 puts ("Module attributes:\n");
1394 if (data[21] & 0x80)
1395 puts (" TBD (bit 7)\n");
1396 if (data[21] & 0x40)
1397 puts (" Analysis probe installed\n");
1398 if (data[21] & 0x20)
1399 puts (" TBD (bit 5)\n");
1400 if (data[21] & 0x10)
1401 puts (" FET switch external enable\n");
1402 printf (" %d PLLs on DIMM\n", (data[21] >> 2) & 0x03);
1403 if (data[20] & 0x11) {
1404 printf (" %d active registers on DIMM\n",
1405 (data[21] & 0x03) + 1);
1409 puts ("Module attributes:\n");
1413 decode_bits (data[21], decode_byte21_default, 0);
1419 decode_bits (data[22], decode_byte22_DDR2, 0);
1422 puts ("Device attributes:\n");
1423 if (data[22] & 0x80) puts (" TBD (bit 7)\n");
1424 if (data[22] & 0x40) puts (" TBD (bit 6)\n");
1425 if (data[22] & 0x20) puts (" Upper Vcc tolerance 5%\n");
1426 else puts (" Upper Vcc tolerance 10%\n");
1427 if (data[22] & 0x10) puts (" Lower Vcc tolerance 5%\n");
1428 else puts (" Lower Vcc tolerance 10%\n");
1429 if (data[22] & 0x08) puts (" Supports write1/read burst\n");
1430 if (data[22] & 0x04) puts (" Supports precharge all\n");
1431 if (data[22] & 0x02) puts (" Supports auto precharge\n");
1432 if (data[22] & 0x01) puts (" Supports early RAS# precharge\n");
1438 printf ("SDRAM cycle time (2nd highest CAS latency) ");
1439 print_ddr2_tcyc (data[23]);
1442 printf ("SDRAM cycle time (2nd highest CAS latency) %d."
1443 "%d ns\n", (data[23] >> 4) & 0x0F, data[23] & 0x0F);
1449 printf ("SDRAM access from clock (2nd highest CAS latency) 0."
1450 "%d%d ns\n", (data[24] >> 4) & 0x0F, data[24] & 0x0F);
1453 printf ("SDRAM access from clock (2nd highest CAS latency) %d."
1454 "%d ns\n", (data[24] >> 4) & 0x0F, data[24] & 0x0F);
1460 printf ("SDRAM cycle time (3rd highest CAS latency) ");
1461 print_ddr2_tcyc (data[25]);
1464 printf ("SDRAM cycle time (3rd highest CAS latency) %d."
1465 "%d ns\n", (data[25] >> 4) & 0x0F, data[25] & 0x0F);
1471 printf ("SDRAM access from clock (3rd highest CAS latency) 0."
1472 "%d%d ns\n", (data[26] >> 4) & 0x0F, data[26] & 0x0F);
1475 printf ("SDRAM access from clock (3rd highest CAS latency) %d."
1476 "%d ns\n", (data[26] >> 4) & 0x0F, data[26] & 0x0F);
1482 printf ("Minimum row precharge %d.%02d ns\n",
1483 (data[27] >> 2) & 0x3F, 25 * (data[27] & 0x03));
1486 printf ("Minimum row precharge %d ns\n", data[27]);
1492 printf ("Row active to row active min %d.%02d ns\n",
1493 (data[28] >> 2) & 0x3F, 25 * (data[28] & 0x03));
1496 printf ("Row active to row active min %d ns\n", data[28]);
1502 printf ("RAS to CAS delay min %d.%02d ns\n",
1503 (data[29] >> 2) & 0x3F, 25 * (data[29] & 0x03));
1506 printf ("RAS to CAS delay min %d ns\n", data[29]);
1510 printf ("Minimum RAS pulse width %d ns\n", data[30]);
1514 puts ("Density of each row ");
1515 decode_bits (data[31], decode_row_density_DDR2, 1);
1519 puts ("Density of each row ");
1520 decode_bits (data[31], decode_row_density_default, 1);
1527 puts ("Command and Address setup ");
1528 if (data[32] >= 0xA0) {
1529 printf ("1.%d%d ns\n",
1530 ((data[32] >> 4) & 0x0F) - 10, data[32] & 0x0F);
1532 printf ("0.%d%d ns\n",
1533 ((data[32] >> 4) & 0x0F), data[32] & 0x0F);
1537 printf ("Command and Address setup %c%d.%d ns\n",
1538 (data[32] & 0x80) ? '-' : '+',
1539 (data[32] >> 4) & 0x07, data[32] & 0x0F);
1545 puts ("Command and Address hold ");
1546 if (data[33] >= 0xA0) {
1547 printf ("1.%d%d ns\n",
1548 ((data[33] >> 4) & 0x0F) - 10, data[33] & 0x0F);
1550 printf ("0.%d%d ns\n",
1551 ((data[33] >> 4) & 0x0F), data[33] & 0x0F);
1555 printf ("Command and Address hold %c%d.%d ns\n",
1556 (data[33] & 0x80) ? '-' : '+',
1557 (data[33] >> 4) & 0x07, data[33] & 0x0F);
1563 printf ("Data signal input setup 0.%d%d ns\n",
1564 (data[34] >> 4) & 0x0F, data[34] & 0x0F);
1567 printf ("Data signal input setup %c%d.%d ns\n",
1568 (data[34] & 0x80) ? '-' : '+',
1569 (data[34] >> 4) & 0x07, data[34] & 0x0F);
1575 printf ("Data signal input hold 0.%d%d ns\n",
1576 (data[35] >> 4) & 0x0F, data[35] & 0x0F);
1579 printf ("Data signal input hold %c%d.%d ns\n",
1580 (data[35] & 0x80) ? '-' : '+',
1581 (data[35] >> 4) & 0x07, data[35] & 0x0F);
1585 puts ("Manufacturer's JEDEC ID ");
1586 for (j = 64; j <= 71; j++)
1587 printf ("%02X ", data[j]);
1589 printf ("Manufacturing Location %02X\n", data[72]);
1590 puts ("Manufacturer's Part Number ");
1591 for (j = 73; j <= 90; j++)
1592 printf ("%02X ", data[j]);
1594 printf ("Revision Code %02X %02X\n", data[91], data[92]);
1595 printf ("Manufacturing Date %02X %02X\n", data[93], data[94]);
1596 puts ("Assembly Serial Number ");
1597 for (j = 95; j <= 98; j++)
1598 printf ("%02X ", data[j]);
1602 printf ("Speed rating PC%d\n",
1603 data[126] == 0x66 ? 66 : data[126]);
1611 * i2c edid {i2c_chip}
1613 #if defined(CONFIG_I2C_EDID)
1614 int do_edid(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
1617 struct edid1_info edid;
1619 #if CONFIG_IS_ENABLED(DM_I2C)
1620 struct udevice *dev;
1628 chip = hextoul(argv[1], NULL);
1629 #if CONFIG_IS_ENABLED(DM_I2C)
1630 ret = i2c_get_cur_bus_chip(chip, &dev);
1632 ret = dm_i2c_read(dev, 0, (uchar *)&edid, sizeof(edid));
1634 ret = i2c_read(chip, 0, 1, (uchar *)&edid, sizeof(edid));
1637 return i2c_report_err(ret, I2C_ERR_READ);
1639 if (edid_check_info(&edid)) {
1640 puts("Content isn't valid EDID.\n");
1644 edid_print_info(&edid);
1648 #endif /* CONFIG_I2C_EDID */
1650 #if CONFIG_IS_ENABLED(DM_I2C)
1651 static void show_bus(struct udevice *bus)
1653 struct udevice *dev;
1655 printf("Bus %d:\t%s", dev_seq(bus), bus->name);
1656 if (device_active(bus))
1657 printf(" (active %d)", dev_seq(bus));
1659 for (device_find_first_child(bus, &dev);
1661 device_find_next_child(&dev)) {
1662 struct dm_i2c_chip *chip = dev_get_parent_plat(dev);
1664 printf(" %02x: %s, offset len %x, flags %x\n",
1665 chip->chip_addr, dev->name, chip->offset_len,
1672 * do_i2c_show_bus() - Handle the "i2c bus" command-line command
1673 * @cmdtp: Command data struct pointer
1674 * @flag: Command flag
1675 * @argc: Command-line argument count
1676 * @argv: Array of command-line arguments
1678 * Returns zero always.
1680 #if CONFIG_IS_ENABLED(SYS_I2C_LEGACY) || CONFIG_IS_ENABLED(DM_I2C)
1681 static int do_i2c_show_bus(struct cmd_tbl *cmdtp, int flag, int argc,
1685 /* show all busses */
1686 #if CONFIG_IS_ENABLED(DM_I2C)
1687 struct udevice *bus;
1691 ret = uclass_get(UCLASS_I2C, &uc);
1693 return CMD_RET_FAILURE;
1694 uclass_foreach_dev(bus, uc)
1699 for (i = 0; i < CFG_SYS_NUM_I2C_BUSES; i++) {
1700 printf("Bus %d:\t%s", i, I2C_ADAP_NR(i)->name);
1707 /* show specific bus */
1708 i = dectoul(argv[1], NULL);
1709 #if CONFIG_IS_ENABLED(DM_I2C)
1710 struct udevice *bus;
1713 ret = uclass_get_device_by_seq(UCLASS_I2C, i, &bus);
1715 printf("Invalid bus %d: err=%d\n", i, ret);
1716 return CMD_RET_FAILURE;
1720 if (i >= CFG_SYS_NUM_I2C_BUSES) {
1721 printf("Invalid bus %d\n", i);
1724 printf("Bus %d:\t%s", i, I2C_ADAP_NR(i)->name);
1734 * do_i2c_bus_num() - Handle the "i2c dev" command-line command
1735 * @cmdtp: Command data struct pointer
1736 * @flag: Command flag
1737 * @argc: Command-line argument count
1738 * @argv: Array of command-line arguments
1740 * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
1743 #if CONFIG_IS_ENABLED(SYS_I2C_LEGACY) || CONFIG_IS_ENABLED(DM_I2C)
1744 static int do_i2c_bus_num(struct cmd_tbl *cmdtp, int flag, int argc,
1751 /* querying current setting */
1752 #if CONFIG_IS_ENABLED(DM_I2C)
1753 struct udevice *bus;
1755 if (!i2c_get_cur_bus(&bus))
1756 bus_no = dev_seq(bus);
1760 bus_no = i2c_get_bus_num();
1762 printf("Current bus is %d\n", bus_no);
1764 bus_no = dectoul(argv[1], NULL);
1765 #if CONFIG_IS_ENABLED(SYS_I2C_LEGACY)
1766 if (bus_no >= CFG_SYS_NUM_I2C_BUSES) {
1767 printf("Invalid bus %d\n", bus_no);
1771 printf("Setting bus to %d\n", bus_no);
1772 #if CONFIG_IS_ENABLED(DM_I2C)
1773 ret = cmd_i2c_set_bus_num(bus_no);
1775 ret = i2c_set_bus_num(bus_no);
1778 printf("Failure changing bus number (%d)\n", ret);
1781 return ret ? CMD_RET_FAILURE : 0;
1783 #endif /* CONFIG_IS_ENABLED(SYS_I2C_LEGACY) */
1786 * do_i2c_bus_speed() - Handle the "i2c speed" command-line command
1787 * @cmdtp: Command data struct pointer
1788 * @flag: Command flag
1789 * @argc: Command-line argument count
1790 * @argv: Array of command-line arguments
1792 * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
1795 static int do_i2c_bus_speed(struct cmd_tbl *cmdtp, int flag, int argc,
1800 #if CONFIG_IS_ENABLED(DM_I2C)
1801 struct udevice *bus;
1803 if (i2c_get_cur_bus(&bus))
1807 #if CONFIG_IS_ENABLED(DM_I2C)
1808 speed = dm_i2c_get_bus_speed(bus);
1810 speed = i2c_get_bus_speed();
1812 /* querying current speed */
1813 printf("Current bus speed=%d\n", speed);
1815 speed = dectoul(argv[1], NULL);
1816 printf("Setting bus speed to %d Hz\n", speed);
1817 #if CONFIG_IS_ENABLED(DM_I2C)
1818 ret = dm_i2c_set_bus_speed(bus, speed);
1820 ret = i2c_set_bus_speed(speed);
1823 printf("Failure changing bus speed (%d)\n", ret);
1826 return ret ? CMD_RET_FAILURE : 0;
1830 * do_i2c_mm() - Handle the "i2c mm" command-line command
1831 * @cmdtp: Command data struct pointer
1832 * @flag: Command flag
1833 * @argc: Command-line argument count
1834 * @argv: Array of command-line arguments
1836 * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
1839 static int do_i2c_mm(struct cmd_tbl *cmdtp, int flag, int argc,
1842 return mod_i2c_mem (cmdtp, 1, flag, argc, argv);
1846 * do_i2c_nm() - Handle the "i2c nm" command-line command
1847 * @cmdtp: Command data struct pointer
1848 * @flag: Command flag
1849 * @argc: Command-line argument count
1850 * @argv: Array of command-line arguments
1852 * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
1855 static int do_i2c_nm(struct cmd_tbl *cmdtp, int flag, int argc,
1858 return mod_i2c_mem (cmdtp, 0, flag, argc, argv);
1862 * do_i2c_reset() - Handle the "i2c reset" command-line command
1863 * @cmdtp: Command data struct pointer
1864 * @flag: Command flag
1865 * @argc: Command-line argument count
1866 * @argv: Array of command-line arguments
1868 * Returns zero always.
1870 static int do_i2c_reset(struct cmd_tbl *cmdtp, int flag, int argc,
1873 #if CONFIG_IS_ENABLED(DM_I2C)
1874 struct udevice *bus;
1876 if (i2c_get_cur_bus(&bus))
1877 return CMD_RET_FAILURE;
1878 if (i2c_deblock(bus)) {
1879 printf("Error: Not supported by the driver\n");
1880 return CMD_RET_FAILURE;
1882 #elif CONFIG_IS_ENABLED(SYS_I2C_LEGACY)
1883 i2c_init(I2C_ADAP->speed, I2C_ADAP->slaveaddr);
1888 static struct cmd_tbl cmd_i2c_sub[] = {
1889 #if CONFIG_IS_ENABLED(SYS_I2C_LEGACY) || CONFIG_IS_ENABLED(DM_I2C)
1890 U_BOOT_CMD_MKENT(bus, 1, 1, do_i2c_show_bus, "", ""),
1892 U_BOOT_CMD_MKENT(crc32, 3, 1, do_i2c_crc, "", ""),
1893 #if CONFIG_IS_ENABLED(SYS_I2C_LEGACY) || CONFIG_IS_ENABLED(DM_I2C)
1894 U_BOOT_CMD_MKENT(dev, 1, 1, do_i2c_bus_num, "", ""),
1896 #if defined(CONFIG_I2C_EDID)
1897 U_BOOT_CMD_MKENT(edid, 1, 1, do_edid, "", ""),
1898 #endif /* CONFIG_I2C_EDID */
1899 U_BOOT_CMD_MKENT(loop, 3, 1, do_i2c_loop, "", ""),
1900 U_BOOT_CMD_MKENT(md, 3, 1, do_i2c_md, "", ""),
1901 U_BOOT_CMD_MKENT(mm, 2, 1, do_i2c_mm, "", ""),
1902 U_BOOT_CMD_MKENT(mw, 3, 1, do_i2c_mw, "", ""),
1903 U_BOOT_CMD_MKENT(nm, 2, 1, do_i2c_nm, "", ""),
1904 U_BOOT_CMD_MKENT(probe, 0, 1, do_i2c_probe, "", ""),
1905 U_BOOT_CMD_MKENT(read, 5, 1, do_i2c_read, "", ""),
1906 U_BOOT_CMD_MKENT(write, 6, 0, do_i2c_write, "", ""),
1907 #if CONFIG_IS_ENABLED(DM_I2C)
1908 U_BOOT_CMD_MKENT(flags, 2, 1, do_i2c_flags, "", ""),
1909 U_BOOT_CMD_MKENT(olen, 2, 1, do_i2c_olen, "", ""),
1911 U_BOOT_CMD_MKENT(reset, 0, 1, do_i2c_reset, "", ""),
1912 #if defined(CONFIG_CMD_SDRAM)
1913 U_BOOT_CMD_MKENT(sdram, 1, 1, do_sdram, "", ""),
1915 U_BOOT_CMD_MKENT(speed, 1, 1, do_i2c_bus_speed, "", ""),
1919 * do_i2c() - Handle the "i2c" command-line command
1920 * @cmdtp: Command data struct pointer
1921 * @flag: Command flag
1922 * @argc: Command-line argument count
1923 * @argv: Array of command-line arguments
1925 * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
1928 static int do_i2c(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
1933 return CMD_RET_USAGE;
1935 /* Strip off leading 'i2c' command argument */
1939 c = find_cmd_tbl(argv[0], &cmd_i2c_sub[0], ARRAY_SIZE(cmd_i2c_sub));
1942 return c->cmd(cmdtp, flag, argc, argv);
1944 return CMD_RET_USAGE;
1947 /***************************************************/
1948 U_BOOT_LONGHELP(i2c,
1949 #if CONFIG_IS_ENABLED(SYS_I2C_LEGACY) || CONFIG_IS_ENABLED(DM_I2C)
1950 "bus [muxtype:muxaddr:muxchannel] - show I2C bus info\n"
1951 "i2c " /* That's the prefix for the crc32 command below. */
1953 "crc32 chip address[.0, .1, .2] count - compute CRC32 checksum\n"
1954 #if CONFIG_IS_ENABLED(SYS_I2C_LEGACY) || CONFIG_IS_ENABLED(DM_I2C)
1955 "i2c dev [dev] - show or set current I2C bus\n"
1957 #if defined(CONFIG_I2C_EDID)
1958 "i2c edid chip - print EDID configuration information\n"
1959 #endif /* CONFIG_I2C_EDID */
1960 "i2c loop chip address[.0, .1, .2] [# of objects] - looping read of device\n"
1961 "i2c md chip address[.0, .1, .2] [# of objects] - read from I2C device\n"
1962 "i2c mm chip address[.0, .1, .2] - write to I2C device (auto-incrementing)\n"
1963 "i2c mw chip address[.0, .1, .2] value [count] - write to I2C device (fill)\n"
1964 "i2c nm chip address[.0, .1, .2] - write to I2C device (constant address)\n"
1965 "i2c probe [address] - test for and show device(s) on the I2C bus\n"
1966 "i2c read chip address[.0, .1, .2] length memaddress - read to memory\n"
1967 "i2c write memaddress chip address[.0, .1, .2] length [-s] - write memory\n"
1968 " to I2C; the -s option selects bulk write in a single transaction\n"
1969 #if CONFIG_IS_ENABLED(DM_I2C)
1970 "i2c flags chip [flags] - set or get chip flags\n"
1971 "i2c olen chip [offset_length] - set or get chip offset length\n"
1973 "i2c reset - re-init the I2C Controller\n"
1974 #if defined(CONFIG_CMD_SDRAM)
1975 "i2c sdram chip - print SDRAM configuration information\n"
1977 "i2c speed [speed] - show or set I2C bus speed");