3 * Sergey Kubushyn, himself, ksi@koi8.net
5 * Changes for unified multibus/multiadapter I2C support.
8 * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com.
10 * SPDX-License-Identifier: GPL-2.0+
14 * I2C Functions similar to the standard memory functions.
16 * There are several parameters in many of the commands that bear further
19 * {i2c_chip} is the I2C chip address (the first byte sent on the bus).
20 * Each I2C chip on the bus has a unique address. On the I2C data bus,
21 * the address is the upper seven bits and the LSB is the "read/write"
22 * bit. Note that the {i2c_chip} address specified on the command
23 * line is not shifted up: e.g. a typical EEPROM memory chip may have
24 * an I2C address of 0x50, but the data put on the bus will be 0xA0
25 * for write and 0xA1 for read. This "non shifted" address notation
26 * matches at least half of the data sheets :-/.
28 * {addr} is the address (or offset) within the chip. Small memory
29 * chips have 8 bit addresses. Large memory chips have 16 bit
30 * addresses. Other memory chips have 9, 10, or 11 bit addresses.
31 * Many non-memory chips have multiple registers and {addr} is used
32 * as the register index. Some non-memory chips have only one register
33 * and therefore don't need any {addr} parameter.
35 * The default {addr} parameter is one byte (.1) which works well for
36 * memories and registers with 8 bits of address space.
38 * You can specify the length of the {addr} field with the optional .0,
39 * .1, or .2 modifier (similar to the .b, .w, .l modifier). If you are
40 * manipulating a single register device which doesn't use an address
41 * field, use "0.0" for the address and the ".0" length field will
42 * suppress the address in the I2C data stream. This also works for
43 * successive reads using the I2C auto-incrementing memory pointer.
45 * If you are manipulating a large memory with 2-byte addresses, use
46 * the .2 address modifier, e.g. 210.2 addresses location 528 (decimal).
48 * Then there are the unfortunate memory chips that spill the most
49 * significant 1, 2, or 3 bits of address into the chip address byte.
50 * This effectively makes one chip (logically) look like 2, 4, or
51 * 8 chips. This is handled (awkwardly) by #defining
52 * CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW and using the .1 modifier on the
53 * {addr} field (since .1 is the default, it doesn't actually have to
54 * be specified). Examples: given a memory chip at I2C chip address
55 * 0x50, the following would happen...
56 * i2c md 50 0 10 display 16 bytes starting at 0x000
57 * On the bus: <S> A0 00 <E> <S> A1 <rd> ... <rd>
58 * i2c md 50 100 10 display 16 bytes starting at 0x100
59 * On the bus: <S> A2 00 <E> <S> A3 <rd> ... <rd>
60 * i2c md 50 210 10 display 16 bytes starting at 0x210
61 * On the bus: <S> A4 10 <E> <S> A5 <rd> ... <rd>
62 * This is awfully ugly. It would be nice if someone would think up
63 * a better way of handling this.
65 * Adapted from cmd_mem.c which is copyright Wolfgang Denk (wd@denx.de).
69 #include <bootretry.h>
74 #include <environment.h>
78 #include <asm/byteorder.h>
79 #include <linux/compiler.h>
81 DECLARE_GLOBAL_DATA_PTR;
83 /* Display values from last command.
84 * Memory modify remembered values are different from display memory.
86 static uint i2c_dp_last_chip;
87 static uint i2c_dp_last_addr;
88 static uint i2c_dp_last_alen;
89 static uint i2c_dp_last_length = 0x10;
91 static uint i2c_mm_last_chip;
92 static uint i2c_mm_last_addr;
93 static uint i2c_mm_last_alen;
95 /* If only one I2C bus is present, the list of devices to ignore when
96 * the probe command is issued is represented by a 1D array of addresses.
97 * When multiple buses are present, the list is an array of bus-address
98 * pairs. The following macros take care of this */
100 #if defined(CONFIG_SYS_I2C_NOPROBES)
101 #if defined(CONFIG_SYS_I2C) || defined(CONFIG_I2C_MULTI_BUS)
106 } i2c_no_probes[] = CONFIG_SYS_I2C_NOPROBES;
107 #define GET_BUS_NUM i2c_get_bus_num()
108 #define COMPARE_BUS(b,i) (i2c_no_probes[(i)].bus == (b))
109 #define COMPARE_ADDR(a,i) (i2c_no_probes[(i)].addr == (a))
110 #define NO_PROBE_ADDR(i) i2c_no_probes[(i)].addr
111 #else /* single bus */
112 static uchar i2c_no_probes[] = CONFIG_SYS_I2C_NOPROBES;
113 #define GET_BUS_NUM 0
114 #define COMPARE_BUS(b,i) ((b) == 0) /* Make compiler happy */
115 #define COMPARE_ADDR(a,i) (i2c_no_probes[(i)] == (a))
116 #define NO_PROBE_ADDR(i) i2c_no_probes[(i)]
117 #endif /* defined(CONFIG_SYS_I2C) */
120 #define DISP_LINE_LEN 16
123 * Default for driver model is to use the chip's existing address length.
124 * For legacy code, this is not stored, so we need to use a suitable
128 #define DEFAULT_ADDR_LEN (-1)
130 #define DEFAULT_ADDR_LEN 1
134 static struct udevice *i2c_cur_bus;
136 static int cmd_i2c_set_bus_num(unsigned int busnum)
141 ret = uclass_get_device_by_seq(UCLASS_I2C, busnum, &bus);
143 debug("%s: No bus %d\n", __func__, busnum);
151 static int i2c_get_cur_bus(struct udevice **busp)
154 puts("No I2C bus selected\n");
162 static int i2c_get_cur_bus_chip(uint chip_addr, struct udevice **devp)
167 ret = i2c_get_cur_bus(&bus);
171 return i2c_get_chip(bus, chip_addr, 1, devp);
177 * i2c_init_board() - Board-specific I2C bus init
179 * This function is the default no-op implementation of I2C bus
180 * initialization. This function can be overriden by board-specific
181 * implementation if needed.
184 void i2c_init_board(void)
188 /* TODO: Implement architecture-specific get/set functions */
191 * i2c_get_bus_speed() - Return I2C bus speed
193 * This function is the default implementation of function for retrieveing
194 * the current I2C bus speed in Hz.
196 * A driver implementing runtime switching of I2C bus speed must override
197 * this function to report the speed correctly. Simple or legacy drivers
198 * can use this fallback.
200 * Returns I2C bus speed in Hz.
202 #if !defined(CONFIG_SYS_I2C) && !defined(CONFIG_DM_I2C)
204 * TODO: Implement architecture-specific get/set functions
205 * Should go away, if we switched completely to new multibus support
208 unsigned int i2c_get_bus_speed(void)
210 return CONFIG_SYS_I2C_SPEED;
214 * i2c_set_bus_speed() - Configure I2C bus speed
215 * @speed: Newly set speed of the I2C bus in Hz
217 * This function is the default implementation of function for setting
218 * the I2C bus speed in Hz.
220 * A driver implementing runtime switching of I2C bus speed must override
221 * this function to report the speed correctly. Simple or legacy drivers
222 * can use this fallback.
224 * Returns zero on success, negative value on error.
227 int i2c_set_bus_speed(unsigned int speed)
229 if (speed != CONFIG_SYS_I2C_SPEED)
237 * get_alen() - Small parser helper function to get address length
239 * Returns the address length.
241 static uint get_alen(char *arg, int default_len)
247 for (j = 0; j < 8; j++) {
249 alen = arg[j+1] - '0';
251 } else if (arg[j] == '\0')
262 static int i2c_report_err(int ret, enum i2c_err_op op)
264 printf("Error %s the chip: %d\n",
265 op == I2C_ERR_READ ? "reading" : "writing", ret);
267 return CMD_RET_FAILURE;
271 * do_i2c_read() - Handle the "i2c read" command-line command
272 * @cmdtp: Command data struct pointer
273 * @flag: Command flag
274 * @argc: Command-line argument count
275 * @argv: Array of command-line arguments
277 * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
281 * i2c read {i2c_chip} {devaddr}{.0, .1, .2} {len} {memaddr}
283 static int do_i2c_read ( cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
286 uint devaddr, length;
295 return CMD_RET_USAGE;
300 chip = simple_strtoul(argv[1], NULL, 16);
303 * I2C data address within the chip. This can be 1 or
304 * 2 bytes long. Some day it might be 3 bytes long :-).
306 devaddr = simple_strtoul(argv[2], NULL, 16);
307 alen = get_alen(argv[2], DEFAULT_ADDR_LEN);
309 return CMD_RET_USAGE;
312 * Length is the number of objects, not number of bytes.
314 length = simple_strtoul(argv[3], NULL, 16);
317 * memaddr is the address where to store things in memory
319 memaddr = (u_char *)simple_strtoul(argv[4], NULL, 16);
322 ret = i2c_get_cur_bus_chip(chip, &dev);
323 if (!ret && alen != -1)
324 ret = i2c_set_chip_offset_len(dev, alen);
326 ret = dm_i2c_read(dev, devaddr, memaddr, length);
328 ret = i2c_read(chip, devaddr, alen, memaddr, length);
331 return i2c_report_err(ret, I2C_ERR_READ);
336 static int do_i2c_write(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
339 uint devaddr, length;
345 struct dm_i2c_chip *i2c_chip;
348 if ((argc < 5) || (argc > 6))
349 return cmd_usage(cmdtp);
352 * memaddr is the address where to store things in memory
354 memaddr = (u_char *)simple_strtoul(argv[1], NULL, 16);
359 chip = simple_strtoul(argv[2], NULL, 16);
362 * I2C data address within the chip. This can be 1 or
363 * 2 bytes long. Some day it might be 3 bytes long :-).
365 devaddr = simple_strtoul(argv[3], NULL, 16);
366 alen = get_alen(argv[3], DEFAULT_ADDR_LEN);
368 return cmd_usage(cmdtp);
371 * Length is the number of bytes.
373 length = simple_strtoul(argv[4], NULL, 16);
376 ret = i2c_get_cur_bus_chip(chip, &dev);
377 if (!ret && alen != -1)
378 ret = i2c_set_chip_offset_len(dev, alen);
380 return i2c_report_err(ret, I2C_ERR_WRITE);
381 i2c_chip = dev_get_parent_platdata(dev);
383 return i2c_report_err(ret, I2C_ERR_WRITE);
386 if (argc == 6 && !strcmp(argv[5], "-s")) {
388 * Write all bytes in a single I2C transaction. If the target
389 * device is an EEPROM, it is your responsibility to not cross
390 * a page boundary. No write delay upon completion, take this
391 * into account if linking commands.
394 i2c_chip->flags &= ~DM_I2C_CHIP_WR_ADDRESS;
395 ret = dm_i2c_write(dev, devaddr, memaddr, length);
397 ret = i2c_write(chip, devaddr, alen, memaddr, length);
400 return i2c_report_err(ret, I2C_ERR_WRITE);
403 * Repeated addressing - perform <length> separate
404 * write transactions of one byte each
406 while (length-- > 0) {
408 i2c_chip->flags |= DM_I2C_CHIP_WR_ADDRESS;
409 ret = dm_i2c_write(dev, devaddr++, memaddr++, 1);
411 ret = i2c_write(chip, devaddr++, alen, memaddr++, 1);
414 return i2c_report_err(ret, I2C_ERR_WRITE);
416 * No write delay with FRAM devices.
418 #if !defined(CONFIG_SYS_I2C_FRAM)
427 static int do_i2c_flags(cmd_tbl_t *cmdtp, int flag, int argc,
436 return CMD_RET_USAGE;
438 chip = simple_strtoul(argv[1], NULL, 16);
439 ret = i2c_get_cur_bus_chip(chip, &dev);
441 return i2c_report_err(ret, I2C_ERR_READ);
444 flags = simple_strtoul(argv[2], NULL, 16);
445 ret = i2c_set_chip_flags(dev, flags);
447 ret = i2c_get_chip_flags(dev, &flags);
449 printf("%x\n", flags);
452 return i2c_report_err(ret, I2C_ERR_READ);
459 * do_i2c_md() - Handle the "i2c md" command-line command
460 * @cmdtp: Command data struct pointer
461 * @flag: Command flag
462 * @argc: Command-line argument count
463 * @argv: Array of command-line arguments
465 * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
469 * i2c md {i2c_chip} {addr}{.0, .1, .2} {len}
471 static int do_i2c_md ( cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
476 int j, nbytes, linebytes;
482 /* We use the last specified parameters, unless new ones are
485 chip = i2c_dp_last_chip;
486 addr = i2c_dp_last_addr;
487 alen = i2c_dp_last_alen;
488 length = i2c_dp_last_length;
491 return CMD_RET_USAGE;
493 if ((flag & CMD_FLAG_REPEAT) == 0) {
495 * New command specified.
501 chip = simple_strtoul(argv[1], NULL, 16);
504 * I2C data address within the chip. This can be 1 or
505 * 2 bytes long. Some day it might be 3 bytes long :-).
507 addr = simple_strtoul(argv[2], NULL, 16);
508 alen = get_alen(argv[2], DEFAULT_ADDR_LEN);
510 return CMD_RET_USAGE;
513 * If another parameter, it is the length to display.
514 * Length is the number of objects, not number of bytes.
517 length = simple_strtoul(argv[3], NULL, 16);
521 ret = i2c_get_cur_bus_chip(chip, &dev);
522 if (!ret && alen != -1)
523 ret = i2c_set_chip_offset_len(dev, alen);
525 return i2c_report_err(ret, I2C_ERR_READ);
531 * We buffer all read data, so we can make sure data is read only
536 unsigned char linebuf[DISP_LINE_LEN];
539 linebytes = (nbytes > DISP_LINE_LEN) ? DISP_LINE_LEN : nbytes;
542 ret = dm_i2c_read(dev, addr, linebuf, linebytes);
544 ret = i2c_read(chip, addr, alen, linebuf, linebytes);
547 return i2c_report_err(ret, I2C_ERR_READ);
549 printf("%04x:", addr);
551 for (j=0; j<linebytes; j++) {
552 printf(" %02x", *cp++);
557 for (j=0; j<linebytes; j++) {
558 if ((*cp < 0x20) || (*cp > 0x7e))
567 } while (nbytes > 0);
569 i2c_dp_last_chip = chip;
570 i2c_dp_last_addr = addr;
571 i2c_dp_last_alen = alen;
572 i2c_dp_last_length = length;
578 * do_i2c_mw() - Handle the "i2c mw" command-line command
579 * @cmdtp: Command data struct pointer
580 * @flag: Command flag
581 * @argc: Command-line argument count
582 * @argv: Array of command-line arguments
584 * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
588 * i2c mw {i2c_chip} {addr}{.0, .1, .2} {data} [{count}]
590 static int do_i2c_mw ( cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
602 if ((argc < 4) || (argc > 5))
603 return CMD_RET_USAGE;
606 * Chip is always specified.
608 chip = simple_strtoul(argv[1], NULL, 16);
611 * Address is always specified.
613 addr = simple_strtoul(argv[2], NULL, 16);
614 alen = get_alen(argv[2], DEFAULT_ADDR_LEN);
616 return CMD_RET_USAGE;
619 ret = i2c_get_cur_bus_chip(chip, &dev);
620 if (!ret && alen != -1)
621 ret = i2c_set_chip_offset_len(dev, alen);
623 return i2c_report_err(ret, I2C_ERR_WRITE);
626 * Value to write is always specified.
628 byte = simple_strtoul(argv[3], NULL, 16);
634 count = simple_strtoul(argv[4], NULL, 16);
638 while (count-- > 0) {
640 ret = dm_i2c_write(dev, addr++, &byte, 1);
642 ret = i2c_write(chip, addr++, alen, &byte, 1);
645 return i2c_report_err(ret, I2C_ERR_WRITE);
647 * Wait for the write to complete. The write can take
648 * up to 10mSec (we allow a little more time).
651 * No write delay with FRAM devices.
653 #if !defined(CONFIG_SYS_I2C_FRAM)
662 * do_i2c_crc() - Handle the "i2c crc32" command-line command
663 * @cmdtp: Command data struct pointer
664 * @flag: Command flag
665 * @argc: Command-line argument count
666 * @argv: Array of command-line arguments
668 * Calculate a CRC on memory
670 * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
674 * i2c crc32 {i2c_chip} {addr}{.0, .1, .2} {count}
676 static int do_i2c_crc (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
691 return CMD_RET_USAGE;
694 * Chip is always specified.
696 chip = simple_strtoul(argv[1], NULL, 16);
699 * Address is always specified.
701 addr = simple_strtoul(argv[2], NULL, 16);
702 alen = get_alen(argv[2], DEFAULT_ADDR_LEN);
704 return CMD_RET_USAGE;
707 ret = i2c_get_cur_bus_chip(chip, &dev);
708 if (!ret && alen != -1)
709 ret = i2c_set_chip_offset_len(dev, alen);
711 return i2c_report_err(ret, I2C_ERR_READ);
714 * Count is always specified
716 count = simple_strtoul(argv[3], NULL, 16);
718 printf ("CRC32 for %08lx ... %08lx ==> ", addr, addr + count - 1);
720 * CRC a byte at a time. This is going to be slooow, but hey, the
721 * memories are small and slow too so hopefully nobody notices.
725 while (count-- > 0) {
727 ret = dm_i2c_read(dev, addr, &byte, 1);
729 ret = i2c_read(chip, addr, alen, &byte, 1);
733 crc = crc32 (crc, &byte, 1);
737 i2c_report_err(ret, I2C_ERR_READ);
739 printf ("%08lx\n", crc);
745 * mod_i2c_mem() - Handle the "i2c mm" and "i2c nm" command-line command
746 * @cmdtp: Command data struct pointer
747 * @flag: Command flag
748 * @argc: Command-line argument count
749 * @argv: Array of command-line arguments
753 * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
757 * i2c mm{.b, .w, .l} {i2c_chip} {addr}{.0, .1, .2}
758 * i2c nm{.b, .w, .l} {i2c_chip} {addr}{.0, .1, .2}
761 mod_i2c_mem(cmd_tbl_t *cmdtp, int incrflag, int flag, int argc, char * const argv[])
775 return CMD_RET_USAGE;
777 bootretry_reset_cmd_timeout(); /* got a good command to get here */
779 * We use the last specified parameters, unless new ones are
782 chip = i2c_mm_last_chip;
783 addr = i2c_mm_last_addr;
784 alen = i2c_mm_last_alen;
786 if ((flag & CMD_FLAG_REPEAT) == 0) {
788 * New command specified. Check for a size specification.
789 * Defaults to byte if no or incorrect specification.
791 size = cmd_get_data_size(argv[0], 1);
794 * Chip is always specified.
796 chip = simple_strtoul(argv[1], NULL, 16);
799 * Address is always specified.
801 addr = simple_strtoul(argv[2], NULL, 16);
802 alen = get_alen(argv[2], DEFAULT_ADDR_LEN);
804 return CMD_RET_USAGE;
808 ret = i2c_get_cur_bus_chip(chip, &dev);
809 if (!ret && alen != -1)
810 ret = i2c_set_chip_offset_len(dev, alen);
812 return i2c_report_err(ret, I2C_ERR_WRITE);
816 * Print the address, followed by value. Then accept input for
817 * the next value. A non-converted value exits.
820 printf("%08lx:", addr);
822 ret = dm_i2c_read(dev, addr, (uchar *)&data, size);
824 ret = i2c_read(chip, addr, alen, (uchar *)&data, size);
827 return i2c_report_err(ret, I2C_ERR_READ);
829 data = cpu_to_be32(data);
831 printf(" %02lx", (data >> 24) & 0x000000FF);
833 printf(" %04lx", (data >> 16) & 0x0000FFFF);
835 printf(" %08lx", data);
837 nbytes = cli_readline(" ? ");
840 * <CR> pressed as only input, don't modify current
841 * location and move to next.
846 /* good enough to not time out */
847 bootretry_reset_cmd_timeout();
849 #ifdef CONFIG_BOOT_RETRY_TIME
850 else if (nbytes == -2)
851 break; /* timed out, exit the command */
856 data = simple_strtoul(console_buffer, &endp, 16);
861 data = be32_to_cpu(data);
862 nbytes = endp - console_buffer;
865 * good enough to not time out
867 bootretry_reset_cmd_timeout();
869 ret = dm_i2c_write(dev, addr, (uchar *)&data,
872 ret = i2c_write(chip, addr, alen,
873 (uchar *)&data, size);
876 return i2c_report_err(ret,
878 #ifdef CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS
879 udelay(CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS * 1000);
887 i2c_mm_last_chip = chip;
888 i2c_mm_last_addr = addr;
889 i2c_mm_last_alen = alen;
895 * do_i2c_probe() - Handle the "i2c probe" command-line command
896 * @cmdtp: Command data struct pointer
897 * @flag: Command flag
898 * @argc: Command-line argument count
899 * @argv: Array of command-line arguments
901 * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
907 * Returns zero (success) if one or more I2C devices was found
909 static int do_i2c_probe (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
914 #if defined(CONFIG_SYS_I2C_NOPROBES)
916 unsigned int bus = GET_BUS_NUM;
917 #endif /* NOPROBES */
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(CONFIG_SYS_I2C_NOPROBES)
936 for (k = 0; k < ARRAY_SIZE(i2c_no_probes); k++) {
937 if (COMPARE_BUS(bus, k) && COMPARE_ADDR(j, k)) {
946 ret = dm_i2c_probe(bus, j, 0, &dev);
957 #if defined(CONFIG_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(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
998 return CMD_RET_USAGE;
1001 * Chip is always specified.
1003 chip = simple_strtoul(argv[1], NULL, 16);
1006 * Address is always specified.
1008 addr = simple_strtoul(argv[2], NULL, 16);
1009 alen = get_alen(argv[2], DEFAULT_ADDR_LEN);
1011 return CMD_RET_USAGE;
1012 #ifdef CONFIG_DM_I2C
1013 ret = i2c_get_cur_bus_chip(chip, &dev);
1014 if (!ret && alen != -1)
1015 ret = i2c_set_chip_offset_len(dev, alen);
1017 return i2c_report_err(ret, I2C_ERR_WRITE);
1021 * Length is the number of objects, not number of bytes.
1024 length = simple_strtoul(argv[3], NULL, 16);
1025 if (length > sizeof(bytes))
1026 length = sizeof(bytes);
1029 * The delay time (uSec) is optional.
1033 delay = simple_strtoul(argv[4], NULL, 10);
1038 #ifdef CONFIG_DM_I2C
1039 ret = dm_i2c_read(dev, addr, bytes, length);
1041 ret = i2c_read(chip, addr, alen, bytes, length);
1044 i2c_report_err(ret, I2C_ERR_READ);
1053 * The SDRAM command is separately configured because many
1054 * (most?) embedded boards don't use SDRAM DIMMs.
1056 * FIXME: Document and probably move elsewhere!
1058 #if defined(CONFIG_CMD_SDRAM)
1059 static void print_ddr2_tcyc (u_char const b)
1061 printf ("%d.", (b >> 4) & 0x0F);
1073 printf ("%d ns\n", b & 0x0F);
1093 static void decode_bits (u_char const b, char const *str[], int const do_once)
1097 for (mask = 0x80; mask != 0x00; mask >>= 1, ++str) {
1108 * i2c sdram {i2c_chip}
1110 static int do_sdram (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
1112 enum { unknown, EDO, SDRAM, DDR2 } type;
1119 static const char *decode_CAS_DDR2[] = {
1120 " TBD", " 6", " 5", " 4", " 3", " 2", " TBD", " TBD"
1123 static const char *decode_CAS_default[] = {
1124 " TBD", " 7", " 6", " 5", " 4", " 3", " 2", " 1"
1127 static const char *decode_CS_WE_default[] = {
1128 " TBD", " 6", " 5", " 4", " 3", " 2", " 1", " 0"
1131 static const char *decode_byte21_default[] = {
1133 " Redundant row address\n",
1134 " Differential clock input\n",
1135 " Registerd DQMB inputs\n",
1136 " Buffered DQMB inputs\n",
1138 " Registered address/control lines\n",
1139 " Buffered address/control lines\n"
1142 static const char *decode_byte22_DDR2[] = {
1148 " Supports partial array self refresh\n",
1149 " Supports 50 ohm ODT\n",
1150 " Supports weak driver\n"
1153 static const char *decode_row_density_DDR2[] = {
1154 "512 MiB", "256 MiB", "128 MiB", "16 GiB",
1155 "8 GiB", "4 GiB", "2 GiB", "1 GiB"
1158 static const char *decode_row_density_default[] = {
1159 "512 MiB", "256 MiB", "128 MiB", "64 MiB",
1160 "32 MiB", "16 MiB", "8 MiB", "4 MiB"
1164 return CMD_RET_USAGE;
1167 * Chip is always specified.
1169 chip = simple_strtoul (argv[1], NULL, 16);
1171 if (i2c_read (chip, 0, 1, data, sizeof (data)) != 0) {
1172 puts ("No SDRAM Serial Presence Detect found.\n");
1177 for (j = 0; j < 63; j++) {
1180 if (cksum != data[63]) {
1181 printf ("WARNING: Configuration data checksum failure:\n"
1182 " is 0x%02x, calculated 0x%02x\n", data[63], cksum);
1184 printf ("SPD data revision %d.%d\n",
1185 (data[62] >> 4) & 0x0F, data[62] & 0x0F);
1186 printf ("Bytes used 0x%02X\n", data[0]);
1187 printf ("Serial memory size 0x%02X\n", 1 << data[1]);
1189 puts ("Memory type ");
1209 puts ("Row address bits ");
1210 if ((data[3] & 0x00F0) == 0)
1211 printf ("%d\n", data[3] & 0x0F);
1213 printf ("%d/%d\n", data[3] & 0x0F, (data[3] >> 4) & 0x0F);
1215 puts ("Column address bits ");
1216 if ((data[4] & 0x00F0) == 0)
1217 printf ("%d\n", data[4] & 0x0F);
1219 printf ("%d/%d\n", data[4] & 0x0F, (data[4] >> 4) & 0x0F);
1223 printf ("Number of ranks %d\n",
1224 (data[5] & 0x07) + 1);
1227 printf ("Module rows %d\n", data[5]);
1233 printf ("Module data width %d bits\n", data[6]);
1236 printf ("Module data width %d bits\n",
1237 (data[7] << 8) | data[6]);
1241 puts ("Interface signal levels ");
1243 case 0: puts ("TTL 5.0 V\n"); break;
1244 case 1: puts ("LVTTL\n"); break;
1245 case 2: puts ("HSTL 1.5 V\n"); break;
1246 case 3: puts ("SSTL 3.3 V\n"); break;
1247 case 4: puts ("SSTL 2.5 V\n"); break;
1248 case 5: puts ("SSTL 1.8 V\n"); break;
1249 default: puts ("unknown\n"); break;
1254 printf ("SDRAM cycle time ");
1255 print_ddr2_tcyc (data[9]);
1258 printf ("SDRAM cycle time %d.%d ns\n",
1259 (data[9] >> 4) & 0x0F, data[9] & 0x0F);
1265 printf ("SDRAM access time 0.%d%d ns\n",
1266 (data[10] >> 4) & 0x0F, data[10] & 0x0F);
1269 printf ("SDRAM access time %d.%d ns\n",
1270 (data[10] >> 4) & 0x0F, data[10] & 0x0F);
1274 puts ("EDC configuration ");
1276 case 0: puts ("None\n"); break;
1277 case 1: puts ("Parity\n"); break;
1278 case 2: puts ("ECC\n"); break;
1279 default: puts ("unknown\n"); break;
1282 if ((data[12] & 0x80) == 0)
1283 puts ("No self refresh, rate ");
1285 puts ("Self refresh, rate ");
1287 switch(data[12] & 0x7F) {
1288 case 0: puts ("15.625 us\n"); break;
1289 case 1: puts ("3.9 us\n"); break;
1290 case 2: puts ("7.8 us\n"); break;
1291 case 3: puts ("31.3 us\n"); break;
1292 case 4: puts ("62.5 us\n"); break;
1293 case 5: puts ("125 us\n"); break;
1294 default: puts ("unknown\n"); break;
1299 printf ("SDRAM width (primary) %d\n", data[13]);
1302 printf ("SDRAM width (primary) %d\n", data[13] & 0x7F);
1303 if ((data[13] & 0x80) != 0) {
1304 printf (" (second bank) %d\n",
1305 2 * (data[13] & 0x7F));
1313 printf ("EDC width %d\n", data[14]);
1316 if (data[14] != 0) {
1317 printf ("EDC width %d\n",
1320 if ((data[14] & 0x80) != 0) {
1321 printf (" (second bank) %d\n",
1322 2 * (data[14] & 0x7F));
1329 printf ("Min clock delay, back-to-back random column addresses "
1333 puts ("Burst length(s) ");
1334 if (data[16] & 0x80) puts (" Page");
1335 if (data[16] & 0x08) puts (" 8");
1336 if (data[16] & 0x04) puts (" 4");
1337 if (data[16] & 0x02) puts (" 2");
1338 if (data[16] & 0x01) puts (" 1");
1340 printf ("Number of banks %d\n", data[17]);
1344 puts ("CAS latency(s) ");
1345 decode_bits (data[18], decode_CAS_DDR2, 0);
1349 puts ("CAS latency(s) ");
1350 decode_bits (data[18], decode_CAS_default, 0);
1356 puts ("CS latency(s) ");
1357 decode_bits (data[19], decode_CS_WE_default, 0);
1362 puts ("WE latency(s) ");
1363 decode_bits (data[20], decode_CS_WE_default, 0);
1369 puts ("Module attributes:\n");
1370 if (data[21] & 0x80)
1371 puts (" TBD (bit 7)\n");
1372 if (data[21] & 0x40)
1373 puts (" Analysis probe installed\n");
1374 if (data[21] & 0x20)
1375 puts (" TBD (bit 5)\n");
1376 if (data[21] & 0x10)
1377 puts (" FET switch external enable\n");
1378 printf (" %d PLLs on DIMM\n", (data[21] >> 2) & 0x03);
1379 if (data[20] & 0x11) {
1380 printf (" %d active registers on DIMM\n",
1381 (data[21] & 0x03) + 1);
1385 puts ("Module attributes:\n");
1389 decode_bits (data[21], decode_byte21_default, 0);
1395 decode_bits (data[22], decode_byte22_DDR2, 0);
1398 puts ("Device attributes:\n");
1399 if (data[22] & 0x80) puts (" TBD (bit 7)\n");
1400 if (data[22] & 0x40) puts (" TBD (bit 6)\n");
1401 if (data[22] & 0x20) puts (" Upper Vcc tolerance 5%\n");
1402 else puts (" Upper Vcc tolerance 10%\n");
1403 if (data[22] & 0x10) puts (" Lower Vcc tolerance 5%\n");
1404 else puts (" Lower Vcc tolerance 10%\n");
1405 if (data[22] & 0x08) puts (" Supports write1/read burst\n");
1406 if (data[22] & 0x04) puts (" Supports precharge all\n");
1407 if (data[22] & 0x02) puts (" Supports auto precharge\n");
1408 if (data[22] & 0x01) puts (" Supports early RAS# precharge\n");
1414 printf ("SDRAM cycle time (2nd highest CAS latency) ");
1415 print_ddr2_tcyc (data[23]);
1418 printf ("SDRAM cycle time (2nd highest CAS latency) %d."
1419 "%d ns\n", (data[23] >> 4) & 0x0F, data[23] & 0x0F);
1425 printf ("SDRAM access from clock (2nd highest CAS latency) 0."
1426 "%d%d ns\n", (data[24] >> 4) & 0x0F, data[24] & 0x0F);
1429 printf ("SDRAM access from clock (2nd highest CAS latency) %d."
1430 "%d ns\n", (data[24] >> 4) & 0x0F, data[24] & 0x0F);
1436 printf ("SDRAM cycle time (3rd highest CAS latency) ");
1437 print_ddr2_tcyc (data[25]);
1440 printf ("SDRAM cycle time (3rd highest CAS latency) %d."
1441 "%d ns\n", (data[25] >> 4) & 0x0F, data[25] & 0x0F);
1447 printf ("SDRAM access from clock (3rd highest CAS latency) 0."
1448 "%d%d ns\n", (data[26] >> 4) & 0x0F, data[26] & 0x0F);
1451 printf ("SDRAM access from clock (3rd highest CAS latency) %d."
1452 "%d ns\n", (data[26] >> 4) & 0x0F, data[26] & 0x0F);
1458 printf ("Minimum row precharge %d.%02d ns\n",
1459 (data[27] >> 2) & 0x3F, 25 * (data[27] & 0x03));
1462 printf ("Minimum row precharge %d ns\n", data[27]);
1468 printf ("Row active to row active min %d.%02d ns\n",
1469 (data[28] >> 2) & 0x3F, 25 * (data[28] & 0x03));
1472 printf ("Row active to row active min %d ns\n", data[28]);
1478 printf ("RAS to CAS delay min %d.%02d ns\n",
1479 (data[29] >> 2) & 0x3F, 25 * (data[29] & 0x03));
1482 printf ("RAS to CAS delay min %d ns\n", data[29]);
1486 printf ("Minimum RAS pulse width %d ns\n", data[30]);
1490 puts ("Density of each row ");
1491 decode_bits (data[31], decode_row_density_DDR2, 1);
1495 puts ("Density of each row ");
1496 decode_bits (data[31], decode_row_density_default, 1);
1503 puts ("Command and Address setup ");
1504 if (data[32] >= 0xA0) {
1505 printf ("1.%d%d ns\n",
1506 ((data[32] >> 4) & 0x0F) - 10, data[32] & 0x0F);
1508 printf ("0.%d%d ns\n",
1509 ((data[32] >> 4) & 0x0F), data[32] & 0x0F);
1513 printf ("Command and Address setup %c%d.%d ns\n",
1514 (data[32] & 0x80) ? '-' : '+',
1515 (data[32] >> 4) & 0x07, data[32] & 0x0F);
1521 puts ("Command and Address hold ");
1522 if (data[33] >= 0xA0) {
1523 printf ("1.%d%d ns\n",
1524 ((data[33] >> 4) & 0x0F) - 10, data[33] & 0x0F);
1526 printf ("0.%d%d ns\n",
1527 ((data[33] >> 4) & 0x0F), data[33] & 0x0F);
1531 printf ("Command and Address hold %c%d.%d ns\n",
1532 (data[33] & 0x80) ? '-' : '+',
1533 (data[33] >> 4) & 0x07, data[33] & 0x0F);
1539 printf ("Data signal input setup 0.%d%d ns\n",
1540 (data[34] >> 4) & 0x0F, data[34] & 0x0F);
1543 printf ("Data signal input setup %c%d.%d ns\n",
1544 (data[34] & 0x80) ? '-' : '+',
1545 (data[34] >> 4) & 0x07, data[34] & 0x0F);
1551 printf ("Data signal input hold 0.%d%d ns\n",
1552 (data[35] >> 4) & 0x0F, data[35] & 0x0F);
1555 printf ("Data signal input hold %c%d.%d ns\n",
1556 (data[35] & 0x80) ? '-' : '+',
1557 (data[35] >> 4) & 0x07, data[35] & 0x0F);
1561 puts ("Manufacturer's JEDEC ID ");
1562 for (j = 64; j <= 71; j++)
1563 printf ("%02X ", data[j]);
1565 printf ("Manufacturing Location %02X\n", data[72]);
1566 puts ("Manufacturer's Part Number ");
1567 for (j = 73; j <= 90; j++)
1568 printf ("%02X ", data[j]);
1570 printf ("Revision Code %02X %02X\n", data[91], data[92]);
1571 printf ("Manufacturing Date %02X %02X\n", data[93], data[94]);
1572 puts ("Assembly Serial Number ");
1573 for (j = 95; j <= 98; j++)
1574 printf ("%02X ", data[j]);
1578 printf ("Speed rating PC%d\n",
1579 data[126] == 0x66 ? 66 : data[126]);
1587 * i2c edid {i2c_chip}
1589 #if defined(CONFIG_I2C_EDID)
1590 int do_edid(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
1593 struct edid1_info edid;
1595 #ifdef CONFIG_DM_I2C
1596 struct udevice *dev;
1604 chip = simple_strtoul(argv[1], NULL, 16);
1605 #ifdef CONFIG_DM_I2C
1606 ret = i2c_get_cur_bus_chip(chip, &dev);
1608 ret = dm_i2c_read(dev, 0, (uchar *)&edid, sizeof(edid));
1610 ret = i2c_read(chip, 0, 1, (uchar *)&edid, sizeof(edid));
1613 return i2c_report_err(ret, I2C_ERR_READ);
1615 if (edid_check_info(&edid)) {
1616 puts("Content isn't valid EDID.\n");
1620 edid_print_info(&edid);
1624 #endif /* CONFIG_I2C_EDID */
1627 * do_i2c_show_bus() - Handle the "i2c bus" command-line command
1628 * @cmdtp: Command data struct pointer
1629 * @flag: Command flag
1630 * @argc: Command-line argument count
1631 * @argv: Array of command-line arguments
1633 * Returns zero always.
1635 #if defined(CONFIG_SYS_I2C)
1636 static int do_i2c_show_bus(cmd_tbl_t *cmdtp, int flag, int argc,
1637 char * const argv[])
1640 #ifndef CONFIG_SYS_I2C_DIRECT_BUS
1645 /* show all busses */
1646 for (i = 0; i < CONFIG_SYS_NUM_I2C_BUSES; i++) {
1647 printf("Bus %d:\t%s", i, I2C_ADAP_NR(i)->name);
1648 #ifndef CONFIG_SYS_I2C_DIRECT_BUS
1649 for (j = 0; j < CONFIG_SYS_I2C_MAX_HOPS; j++) {
1650 if (i2c_bus[i].next_hop[j].chip == 0)
1652 printf("->%s@0x%2x:%d",
1653 i2c_bus[i].next_hop[j].mux.name,
1654 i2c_bus[i].next_hop[j].chip,
1655 i2c_bus[i].next_hop[j].channel);
1661 /* show specific bus */
1662 i = simple_strtoul(argv[1], NULL, 10);
1663 if (i >= CONFIG_SYS_NUM_I2C_BUSES) {
1664 printf("Invalid bus %d\n", i);
1667 printf("Bus %d:\t%s", i, I2C_ADAP_NR(i)->name);
1668 #ifndef CONFIG_SYS_I2C_DIRECT_BUS
1669 for (j = 0; j < CONFIG_SYS_I2C_MAX_HOPS; j++) {
1670 if (i2c_bus[i].next_hop[j].chip == 0)
1672 printf("->%s@0x%2x:%d",
1673 i2c_bus[i].next_hop[j].mux.name,
1674 i2c_bus[i].next_hop[j].chip,
1675 i2c_bus[i].next_hop[j].channel);
1686 * do_i2c_bus_num() - Handle the "i2c dev" command-line command
1687 * @cmdtp: Command data struct pointer
1688 * @flag: Command flag
1689 * @argc: Command-line argument count
1690 * @argv: Array of command-line arguments
1692 * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
1695 #if defined(CONFIG_SYS_I2C) || defined(CONFIG_I2C_MULTI_BUS) || \
1696 defined(CONFIG_DM_I2C)
1697 static int do_i2c_bus_num(cmd_tbl_t *cmdtp, int flag, int argc,
1698 char * const argv[])
1704 /* querying current setting */
1705 #ifdef CONFIG_DM_I2C
1706 struct udevice *bus;
1708 if (!i2c_get_cur_bus(&bus))
1713 bus_no = i2c_get_bus_num();
1715 printf("Current bus is %d\n", bus_no);
1717 bus_no = simple_strtoul(argv[1], NULL, 10);
1718 #if defined(CONFIG_SYS_I2C)
1719 if (bus_no >= CONFIG_SYS_NUM_I2C_BUSES) {
1720 printf("Invalid bus %d\n", bus_no);
1724 printf("Setting bus to %d\n", bus_no);
1725 #ifdef CONFIG_DM_I2C
1726 ret = cmd_i2c_set_bus_num(bus_no);
1728 ret = i2c_set_bus_num(bus_no);
1731 printf("Failure changing bus number (%d)\n", ret);
1735 #endif /* defined(CONFIG_SYS_I2C) */
1738 * do_i2c_bus_speed() - Handle the "i2c speed" command-line command
1739 * @cmdtp: Command data struct pointer
1740 * @flag: Command flag
1741 * @argc: Command-line argument count
1742 * @argv: Array of command-line arguments
1744 * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
1747 static int do_i2c_bus_speed(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
1751 #ifdef CONFIG_DM_I2C
1752 struct udevice *bus;
1754 if (i2c_get_cur_bus(&bus))
1758 #ifdef CONFIG_DM_I2C
1759 speed = dm_i2c_get_bus_speed(bus);
1761 speed = i2c_get_bus_speed();
1763 /* querying current speed */
1764 printf("Current bus speed=%d\n", speed);
1766 speed = simple_strtoul(argv[1], NULL, 10);
1767 printf("Setting bus speed to %d Hz\n", speed);
1768 #ifdef CONFIG_DM_I2C
1769 ret = dm_i2c_set_bus_speed(bus, speed);
1771 ret = i2c_set_bus_speed(speed);
1774 printf("Failure changing bus speed (%d)\n", ret);
1780 * do_i2c_mm() - Handle the "i2c mm" command-line command
1781 * @cmdtp: Command data struct pointer
1782 * @flag: Command flag
1783 * @argc: Command-line argument count
1784 * @argv: Array of command-line arguments
1786 * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
1789 static int do_i2c_mm(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
1791 return mod_i2c_mem (cmdtp, 1, flag, argc, argv);
1795 * do_i2c_nm() - Handle the "i2c nm" command-line command
1796 * @cmdtp: Command data struct pointer
1797 * @flag: Command flag
1798 * @argc: Command-line argument count
1799 * @argv: Array of command-line arguments
1801 * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
1804 static int do_i2c_nm(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
1806 return mod_i2c_mem (cmdtp, 0, flag, argc, argv);
1810 * do_i2c_reset() - Handle the "i2c reset" command-line command
1811 * @cmdtp: Command data struct pointer
1812 * @flag: Command flag
1813 * @argc: Command-line argument count
1814 * @argv: Array of command-line arguments
1816 * Returns zero always.
1818 static int do_i2c_reset(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
1820 #if defined(CONFIG_DM_I2C)
1821 struct udevice *bus;
1823 if (i2c_get_cur_bus(&bus))
1824 return CMD_RET_FAILURE;
1825 if (i2c_deblock(bus)) {
1826 printf("Error: Not supported by the driver\n");
1827 return CMD_RET_FAILURE;
1829 #elif defined(CONFIG_SYS_I2C)
1830 i2c_init(I2C_ADAP->speed, I2C_ADAP->slaveaddr);
1832 i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
1837 static cmd_tbl_t cmd_i2c_sub[] = {
1838 #if defined(CONFIG_SYS_I2C)
1839 U_BOOT_CMD_MKENT(bus, 1, 1, do_i2c_show_bus, "", ""),
1841 U_BOOT_CMD_MKENT(crc32, 3, 1, do_i2c_crc, "", ""),
1842 #if defined(CONFIG_SYS_I2C) || \
1843 defined(CONFIG_I2C_MULTI_BUS) || defined(CONFIG_DM_I2C)
1844 U_BOOT_CMD_MKENT(dev, 1, 1, do_i2c_bus_num, "", ""),
1845 #endif /* CONFIG_I2C_MULTI_BUS */
1846 #if defined(CONFIG_I2C_EDID)
1847 U_BOOT_CMD_MKENT(edid, 1, 1, do_edid, "", ""),
1848 #endif /* CONFIG_I2C_EDID */
1849 U_BOOT_CMD_MKENT(loop, 3, 1, do_i2c_loop, "", ""),
1850 U_BOOT_CMD_MKENT(md, 3, 1, do_i2c_md, "", ""),
1851 U_BOOT_CMD_MKENT(mm, 2, 1, do_i2c_mm, "", ""),
1852 U_BOOT_CMD_MKENT(mw, 3, 1, do_i2c_mw, "", ""),
1853 U_BOOT_CMD_MKENT(nm, 2, 1, do_i2c_nm, "", ""),
1854 U_BOOT_CMD_MKENT(probe, 0, 1, do_i2c_probe, "", ""),
1855 U_BOOT_CMD_MKENT(read, 5, 1, do_i2c_read, "", ""),
1856 U_BOOT_CMD_MKENT(write, 6, 0, do_i2c_write, "", ""),
1857 #ifdef CONFIG_DM_I2C
1858 U_BOOT_CMD_MKENT(flags, 2, 1, do_i2c_flags, "", ""),
1860 U_BOOT_CMD_MKENT(reset, 0, 1, do_i2c_reset, "", ""),
1861 #if defined(CONFIG_CMD_SDRAM)
1862 U_BOOT_CMD_MKENT(sdram, 1, 1, do_sdram, "", ""),
1864 U_BOOT_CMD_MKENT(speed, 1, 1, do_i2c_bus_speed, "", ""),
1867 #ifdef CONFIG_NEEDS_MANUAL_RELOC
1868 void i2c_reloc(void) {
1869 fixup_cmdtable(cmd_i2c_sub, ARRAY_SIZE(cmd_i2c_sub));
1874 * do_i2c() - Handle the "i2c" command-line command
1875 * @cmdtp: Command data struct pointer
1876 * @flag: Command flag
1877 * @argc: Command-line argument count
1878 * @argv: Array of command-line arguments
1880 * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
1883 static int do_i2c(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
1888 return CMD_RET_USAGE;
1890 /* Strip off leading 'i2c' command argument */
1894 c = find_cmd_tbl(argv[0], &cmd_i2c_sub[0], ARRAY_SIZE(cmd_i2c_sub));
1897 return c->cmd(cmdtp, flag, argc, argv);
1899 return CMD_RET_USAGE;
1902 /***************************************************/
1903 #ifdef CONFIG_SYS_LONGHELP
1904 static char i2c_help_text[] =
1905 #if defined(CONFIG_SYS_I2C)
1906 "bus [muxtype:muxaddr:muxchannel] - show I2C bus info\n"
1908 "crc32 chip address[.0, .1, .2] count - compute CRC32 checksum\n"
1909 #if defined(CONFIG_SYS_I2C) || \
1910 defined(CONFIG_I2C_MULTI_BUS) || defined(CONFIG_DM_I2C)
1911 "i2c dev [dev] - show or set current I2C bus\n"
1912 #endif /* CONFIG_I2C_MULTI_BUS */
1913 #if defined(CONFIG_I2C_EDID)
1914 "i2c edid chip - print EDID configuration information\n"
1915 #endif /* CONFIG_I2C_EDID */
1916 "i2c loop chip address[.0, .1, .2] [# of objects] - looping read of device\n"
1917 "i2c md chip address[.0, .1, .2] [# of objects] - read from I2C device\n"
1918 "i2c mm chip address[.0, .1, .2] - write to I2C device (auto-incrementing)\n"
1919 "i2c mw chip address[.0, .1, .2] value [count] - write to I2C device (fill)\n"
1920 "i2c nm chip address[.0, .1, .2] - write to I2C device (constant address)\n"
1921 "i2c probe [address] - test for and show device(s) on the I2C bus\n"
1922 "i2c read chip address[.0, .1, .2] length memaddress - read to memory\n"
1923 "i2c write memaddress chip address[.0, .1, .2] length [-s] - write memory\n"
1924 " to I2C; the -s option selects bulk write in a single transaction\n"
1925 #ifdef CONFIG_DM_I2C
1926 "i2c flags chip [flags] - set or get chip flags\n"
1928 "i2c reset - re-init the I2C Controller\n"
1929 #if defined(CONFIG_CMD_SDRAM)
1930 "i2c sdram chip - print SDRAM configuration information\n"
1932 "i2c speed [speed] - show or set I2C bus speed";