xref: /openbmc/u-boot/cmd/i2c.c (revision 116b49cf)
1 /*
2  * (C) Copyright 2009
3  * Sergey Kubushyn, himself, ksi@koi8.net
4  *
5  * Changes for unified multibus/multiadapter I2C support.
6  *
7  * (C) Copyright 2001
8  * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com.
9  *
10  * SPDX-License-Identifier:	GPL-2.0+
11  */
12 
13 /*
14  * I2C Functions similar to the standard memory functions.
15  *
16  * There are several parameters in many of the commands that bear further
17  * explanations:
18  *
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 :-/.
27  *
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.
34  *
35  *   The default {addr} parameter is one byte (.1) which works well for
36  *   memories and registers with 8 bits of address space.
37  *
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.
44  *
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).
47  *
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.
64  *
65  * Adapted from cmd_mem.c which is copyright Wolfgang Denk (wd@denx.de).
66  */
67 
68 #include <common.h>
69 #include <bootretry.h>
70 #include <cli.h>
71 #include <command.h>
72 #include <console.h>
73 #include <dm.h>
74 #include <edid.h>
75 #include <environment.h>
76 #include <errno.h>
77 #include <i2c.h>
78 #include <malloc.h>
79 #include <asm/byteorder.h>
80 #include <linux/compiler.h>
81 
82 DECLARE_GLOBAL_DATA_PTR;
83 
84 /* Display values from last command.
85  * Memory modify remembered values are different from display memory.
86  */
87 static uint	i2c_dp_last_chip;
88 static uint	i2c_dp_last_addr;
89 static uint	i2c_dp_last_alen;
90 static uint	i2c_dp_last_length = 0x10;
91 
92 static uint	i2c_mm_last_chip;
93 static uint	i2c_mm_last_addr;
94 static uint	i2c_mm_last_alen;
95 
96 /* If only one I2C bus is present, the list of devices to ignore when
97  * the probe command is issued is represented by a 1D array of addresses.
98  * When multiple buses are present, the list is an array of bus-address
99  * pairs.  The following macros take care of this */
100 
101 #if defined(CONFIG_SYS_I2C_NOPROBES)
102 #if defined(CONFIG_SYS_I2C) || defined(CONFIG_I2C_MULTI_BUS)
103 static struct
104 {
105 	uchar	bus;
106 	uchar	addr;
107 } i2c_no_probes[] = CONFIG_SYS_I2C_NOPROBES;
108 #define GET_BUS_NUM	i2c_get_bus_num()
109 #define COMPARE_BUS(b,i)	(i2c_no_probes[(i)].bus == (b))
110 #define COMPARE_ADDR(a,i)	(i2c_no_probes[(i)].addr == (a))
111 #define NO_PROBE_ADDR(i)	i2c_no_probes[(i)].addr
112 #else		/* single bus */
113 static uchar i2c_no_probes[] = CONFIG_SYS_I2C_NOPROBES;
114 #define GET_BUS_NUM	0
115 #define COMPARE_BUS(b,i)	((b) == 0)	/* Make compiler happy */
116 #define COMPARE_ADDR(a,i)	(i2c_no_probes[(i)] == (a))
117 #define NO_PROBE_ADDR(i)	i2c_no_probes[(i)]
118 #endif	/* defined(CONFIG_SYS_I2C) */
119 #endif
120 
121 #define DISP_LINE_LEN	16
122 
123 /*
124  * Default for driver model is to use the chip's existing address length.
125  * For legacy code, this is not stored, so we need to use a suitable
126  * default.
127  */
128 #ifdef CONFIG_DM_I2C
129 #define DEFAULT_ADDR_LEN	(-1)
130 #else
131 #define DEFAULT_ADDR_LEN	1
132 #endif
133 
134 #ifdef CONFIG_DM_I2C
135 static struct udevice *i2c_cur_bus;
136 
137 static int cmd_i2c_set_bus_num(unsigned int busnum)
138 {
139 	struct udevice *bus;
140 	int ret;
141 
142 	ret = uclass_get_device_by_seq(UCLASS_I2C, busnum, &bus);
143 	if (ret) {
144 		debug("%s: No bus %d\n", __func__, busnum);
145 		return ret;
146 	}
147 	i2c_cur_bus = bus;
148 
149 	return 0;
150 }
151 
152 static int i2c_get_cur_bus(struct udevice **busp)
153 {
154 #ifdef CONFIG_I2C_SET_DEFAULT_BUS_NUM
155 	if (!i2c_cur_bus) {
156 		if (cmd_i2c_set_bus_num(CONFIG_I2C_DEFAULT_BUS_NUMBER)) {
157 			printf("Default I2C bus %d not found\n",
158 			       CONFIG_I2C_DEFAULT_BUS_NUMBER);
159 			return -ENODEV;
160 		}
161 	}
162 #endif
163 
164 	if (!i2c_cur_bus) {
165 		puts("No I2C bus selected\n");
166 		return -ENODEV;
167 	}
168 	*busp = i2c_cur_bus;
169 
170 	return 0;
171 }
172 
173 static int i2c_get_cur_bus_chip(uint chip_addr, struct udevice **devp)
174 {
175 	struct udevice *bus;
176 	int ret;
177 
178 	ret = i2c_get_cur_bus(&bus);
179 	if (ret)
180 		return ret;
181 
182 	return i2c_get_chip(bus, chip_addr, 1, devp);
183 }
184 
185 #endif
186 
187 /**
188  * i2c_init_board() - Board-specific I2C bus init
189  *
190  * This function is the default no-op implementation of I2C bus
191  * initialization. This function can be overridden by board-specific
192  * implementation if needed.
193  */
194 __weak
195 void i2c_init_board(void)
196 {
197 }
198 
199 /* TODO: Implement architecture-specific get/set functions */
200 
201 /**
202  * i2c_get_bus_speed() - Return I2C bus speed
203  *
204  * This function is the default implementation of function for retrieveing
205  * the current I2C bus speed in Hz.
206  *
207  * A driver implementing runtime switching of I2C bus speed must override
208  * this function to report the speed correctly. Simple or legacy drivers
209  * can use this fallback.
210  *
211  * Returns I2C bus speed in Hz.
212  */
213 #if !defined(CONFIG_SYS_I2C) && !defined(CONFIG_DM_I2C)
214 /*
215  * TODO: Implement architecture-specific get/set functions
216  * Should go away, if we switched completely to new multibus support
217  */
218 __weak
219 unsigned int i2c_get_bus_speed(void)
220 {
221 	return CONFIG_SYS_I2C_SPEED;
222 }
223 
224 /**
225  * i2c_set_bus_speed() - Configure I2C bus speed
226  * @speed:	Newly set speed of the I2C bus in Hz
227  *
228  * This function is the default implementation of function for setting
229  * the I2C bus speed in Hz.
230  *
231  * A driver implementing runtime switching of I2C bus speed must override
232  * this function to report the speed correctly. Simple or legacy drivers
233  * can use this fallback.
234  *
235  * Returns zero on success, negative value on error.
236  */
237 __weak
238 int i2c_set_bus_speed(unsigned int speed)
239 {
240 	if (speed != CONFIG_SYS_I2C_SPEED)
241 		return -1;
242 
243 	return 0;
244 }
245 #endif
246 
247 /**
248  * get_alen() - Small parser helper function to get address length
249  *
250  * Returns the address length.
251  */
252 static uint get_alen(char *arg, int default_len)
253 {
254 	int	j;
255 	int	alen;
256 
257 	alen = default_len;
258 	for (j = 0; j < 8; j++) {
259 		if (arg[j] == '.') {
260 			alen = arg[j+1] - '0';
261 			break;
262 		} else if (arg[j] == '\0')
263 			break;
264 	}
265 	return alen;
266 }
267 
268 enum i2c_err_op {
269 	I2C_ERR_READ,
270 	I2C_ERR_WRITE,
271 };
272 
273 static int i2c_report_err(int ret, enum i2c_err_op op)
274 {
275 	printf("Error %s the chip: %d\n",
276 	       op == I2C_ERR_READ ? "reading" : "writing", ret);
277 
278 	return CMD_RET_FAILURE;
279 }
280 
281 /**
282  * do_i2c_read() - Handle the "i2c read" command-line command
283  * @cmdtp:	Command data struct pointer
284  * @flag:	Command flag
285  * @argc:	Command-line argument count
286  * @argv:	Array of command-line arguments
287  *
288  * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
289  * on error.
290  *
291  * Syntax:
292  *	i2c read {i2c_chip} {devaddr}{.0, .1, .2} {len} {memaddr}
293  */
294 static int do_i2c_read ( cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
295 {
296 	uint	chip;
297 	uint	devaddr, length;
298 	int alen;
299 	u_char  *memaddr;
300 	int ret;
301 #ifdef CONFIG_DM_I2C
302 	struct udevice *dev;
303 #endif
304 
305 	if (argc != 5)
306 		return CMD_RET_USAGE;
307 
308 	/*
309 	 * I2C chip address
310 	 */
311 	chip = simple_strtoul(argv[1], NULL, 16);
312 
313 	/*
314 	 * I2C data address within the chip.  This can be 1 or
315 	 * 2 bytes long.  Some day it might be 3 bytes long :-).
316 	 */
317 	devaddr = simple_strtoul(argv[2], NULL, 16);
318 	alen = get_alen(argv[2], DEFAULT_ADDR_LEN);
319 	if (alen > 3)
320 		return CMD_RET_USAGE;
321 
322 	/*
323 	 * Length is the number of objects, not number of bytes.
324 	 */
325 	length = simple_strtoul(argv[3], NULL, 16);
326 
327 	/*
328 	 * memaddr is the address where to store things in memory
329 	 */
330 	memaddr = (u_char *)simple_strtoul(argv[4], NULL, 16);
331 
332 #ifdef CONFIG_DM_I2C
333 	ret = i2c_get_cur_bus_chip(chip, &dev);
334 	if (!ret && alen != -1)
335 		ret = i2c_set_chip_offset_len(dev, alen);
336 	if (!ret)
337 		ret = dm_i2c_read(dev, devaddr, memaddr, length);
338 #else
339 	ret = i2c_read(chip, devaddr, alen, memaddr, length);
340 #endif
341 	if (ret)
342 		return i2c_report_err(ret, I2C_ERR_READ);
343 
344 	return 0;
345 }
346 
347 static int do_i2c_write(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
348 {
349 	uint	chip;
350 	uint	devaddr, length;
351 	int alen;
352 	u_char  *memaddr;
353 	int ret;
354 #ifdef CONFIG_DM_I2C
355 	struct udevice *dev;
356 	struct dm_i2c_chip *i2c_chip;
357 #endif
358 
359 	if ((argc < 5) || (argc > 6))
360 		return cmd_usage(cmdtp);
361 
362 	/*
363 	 * memaddr is the address where to store things in memory
364 	 */
365 	memaddr = (u_char *)simple_strtoul(argv[1], NULL, 16);
366 
367 	/*
368 	 * I2C chip address
369 	 */
370 	chip = simple_strtoul(argv[2], NULL, 16);
371 
372 	/*
373 	 * I2C data address within the chip.  This can be 1 or
374 	 * 2 bytes long.  Some day it might be 3 bytes long :-).
375 	 */
376 	devaddr = simple_strtoul(argv[3], NULL, 16);
377 	alen = get_alen(argv[3], DEFAULT_ADDR_LEN);
378 	if (alen > 3)
379 		return cmd_usage(cmdtp);
380 
381 	/*
382 	 * Length is the number of bytes.
383 	 */
384 	length = simple_strtoul(argv[4], NULL, 16);
385 
386 #ifdef CONFIG_DM_I2C
387 	ret = i2c_get_cur_bus_chip(chip, &dev);
388 	if (!ret && alen != -1)
389 		ret = i2c_set_chip_offset_len(dev, alen);
390 	if (ret)
391 		return i2c_report_err(ret, I2C_ERR_WRITE);
392 	i2c_chip = dev_get_parent_platdata(dev);
393 	if (!i2c_chip)
394 		return i2c_report_err(ret, I2C_ERR_WRITE);
395 #endif
396 
397 	if (argc == 6 && !strcmp(argv[5], "-s")) {
398 		/*
399 		 * Write all bytes in a single I2C transaction. If the target
400 		 * device is an EEPROM, it is your responsibility to not cross
401 		 * a page boundary. No write delay upon completion, take this
402 		 * into account if linking commands.
403 		 */
404 #ifdef CONFIG_DM_I2C
405 		i2c_chip->flags &= ~DM_I2C_CHIP_WR_ADDRESS;
406 		ret = dm_i2c_write(dev, devaddr, memaddr, length);
407 #else
408 		ret = i2c_write(chip, devaddr, alen, memaddr, length);
409 #endif
410 		if (ret)
411 			return i2c_report_err(ret, I2C_ERR_WRITE);
412 	} else {
413 		/*
414 		 * Repeated addressing - perform <length> separate
415 		 * write transactions of one byte each
416 		 */
417 		while (length-- > 0) {
418 #ifdef CONFIG_DM_I2C
419 			i2c_chip->flags |= DM_I2C_CHIP_WR_ADDRESS;
420 			ret = dm_i2c_write(dev, devaddr++, memaddr++, 1);
421 #else
422 			ret = i2c_write(chip, devaddr++, alen, memaddr++, 1);
423 #endif
424 			if (ret)
425 				return i2c_report_err(ret, I2C_ERR_WRITE);
426 /*
427  * No write delay with FRAM devices.
428  */
429 #if !defined(CONFIG_SYS_I2C_FRAM)
430 			udelay(11000);
431 #endif
432 		}
433 	}
434 	return 0;
435 }
436 
437 #ifdef CONFIG_DM_I2C
438 static int do_i2c_flags(cmd_tbl_t *cmdtp, int flag, int argc,
439 			char *const argv[])
440 {
441 	struct udevice *dev;
442 	uint flags;
443 	int chip;
444 	int ret;
445 
446 	if (argc < 2)
447 		return CMD_RET_USAGE;
448 
449 	chip = simple_strtoul(argv[1], NULL, 16);
450 	ret = i2c_get_cur_bus_chip(chip, &dev);
451 	if (ret)
452 		return i2c_report_err(ret, I2C_ERR_READ);
453 
454 	if (argc > 2) {
455 		flags = simple_strtoul(argv[2], NULL, 16);
456 		ret = i2c_set_chip_flags(dev, flags);
457 	} else  {
458 		ret = i2c_get_chip_flags(dev, &flags);
459 		if (!ret)
460 			printf("%x\n", flags);
461 	}
462 	if (ret)
463 		return i2c_report_err(ret, I2C_ERR_READ);
464 
465 	return 0;
466 }
467 
468 static int do_i2c_olen(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
469 {
470 	struct udevice *dev;
471 	uint olen;
472 	int chip;
473 	int ret;
474 
475 	if (argc < 2)
476 		return CMD_RET_USAGE;
477 
478 	chip = simple_strtoul(argv[1], NULL, 16);
479 	ret = i2c_get_cur_bus_chip(chip, &dev);
480 	if (ret)
481 		return i2c_report_err(ret, I2C_ERR_READ);
482 
483 	if (argc > 2) {
484 		olen = simple_strtoul(argv[2], NULL, 16);
485 		ret = i2c_set_chip_offset_len(dev, olen);
486 	} else  {
487 		ret = i2c_get_chip_offset_len(dev);
488 		if (ret >= 0) {
489 			printf("%x\n", ret);
490 			ret = 0;
491 		}
492 	}
493 	if (ret)
494 		return i2c_report_err(ret, I2C_ERR_READ);
495 
496 	return 0;
497 }
498 #endif
499 
500 /**
501  * do_i2c_md() - Handle the "i2c md" command-line command
502  * @cmdtp:	Command data struct pointer
503  * @flag:	Command flag
504  * @argc:	Command-line argument count
505  * @argv:	Array of command-line arguments
506  *
507  * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
508  * on error.
509  *
510  * Syntax:
511  *	i2c md {i2c_chip} {addr}{.0, .1, .2} {len}
512  */
513 static int do_i2c_md ( cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
514 {
515 	uint	chip;
516 	uint	addr, length;
517 	int alen;
518 	int	j, nbytes, linebytes;
519 	int ret;
520 #ifdef CONFIG_DM_I2C
521 	struct udevice *dev;
522 #endif
523 
524 	/* We use the last specified parameters, unless new ones are
525 	 * entered.
526 	 */
527 	chip   = i2c_dp_last_chip;
528 	addr   = i2c_dp_last_addr;
529 	alen   = i2c_dp_last_alen;
530 	length = i2c_dp_last_length;
531 
532 	if (argc < 3)
533 		return CMD_RET_USAGE;
534 
535 	if ((flag & CMD_FLAG_REPEAT) == 0) {
536 		/*
537 		 * New command specified.
538 		 */
539 
540 		/*
541 		 * I2C chip address
542 		 */
543 		chip = simple_strtoul(argv[1], NULL, 16);
544 
545 		/*
546 		 * I2C data address within the chip.  This can be 1 or
547 		 * 2 bytes long.  Some day it might be 3 bytes long :-).
548 		 */
549 		addr = simple_strtoul(argv[2], NULL, 16);
550 		alen = get_alen(argv[2], DEFAULT_ADDR_LEN);
551 		if (alen > 3)
552 			return CMD_RET_USAGE;
553 
554 		/*
555 		 * If another parameter, it is the length to display.
556 		 * Length is the number of objects, not number of bytes.
557 		 */
558 		if (argc > 3)
559 			length = simple_strtoul(argv[3], NULL, 16);
560 	}
561 
562 #ifdef CONFIG_DM_I2C
563 	ret = i2c_get_cur_bus_chip(chip, &dev);
564 	if (!ret && alen != -1)
565 		ret = i2c_set_chip_offset_len(dev, alen);
566 	if (ret)
567 		return i2c_report_err(ret, I2C_ERR_READ);
568 #endif
569 
570 	/*
571 	 * Print the lines.
572 	 *
573 	 * We buffer all read data, so we can make sure data is read only
574 	 * once.
575 	 */
576 	nbytes = length;
577 	do {
578 		unsigned char	linebuf[DISP_LINE_LEN];
579 		unsigned char	*cp;
580 
581 		linebytes = (nbytes > DISP_LINE_LEN) ? DISP_LINE_LEN : nbytes;
582 
583 #ifdef CONFIG_DM_I2C
584 		ret = dm_i2c_read(dev, addr, linebuf, linebytes);
585 #else
586 		ret = i2c_read(chip, addr, alen, linebuf, linebytes);
587 #endif
588 		if (ret)
589 			return i2c_report_err(ret, I2C_ERR_READ);
590 		else {
591 			printf("%04x:", addr);
592 			cp = linebuf;
593 			for (j=0; j<linebytes; j++) {
594 				printf(" %02x", *cp++);
595 				addr++;
596 			}
597 			puts ("    ");
598 			cp = linebuf;
599 			for (j=0; j<linebytes; j++) {
600 				if ((*cp < 0x20) || (*cp > 0x7e))
601 					puts (".");
602 				else
603 					printf("%c", *cp);
604 				cp++;
605 			}
606 			putc ('\n');
607 		}
608 		nbytes -= linebytes;
609 	} while (nbytes > 0);
610 
611 	i2c_dp_last_chip   = chip;
612 	i2c_dp_last_addr   = addr;
613 	i2c_dp_last_alen   = alen;
614 	i2c_dp_last_length = length;
615 
616 	return 0;
617 }
618 
619 /**
620  * do_i2c_mw() - Handle the "i2c mw" command-line command
621  * @cmdtp:	Command data struct pointer
622  * @flag:	Command flag
623  * @argc:	Command-line argument count
624  * @argv:	Array of command-line arguments
625  *
626  * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
627  * on error.
628  *
629  * Syntax:
630  *	i2c mw {i2c_chip} {addr}{.0, .1, .2} {data} [{count}]
631  */
632 static int do_i2c_mw ( cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
633 {
634 	uint	chip;
635 	ulong	addr;
636 	int	alen;
637 	uchar	byte;
638 	int	count;
639 	int ret;
640 #ifdef CONFIG_DM_I2C
641 	struct udevice *dev;
642 #endif
643 
644 	if ((argc < 4) || (argc > 5))
645 		return CMD_RET_USAGE;
646 
647 	/*
648 	 * Chip is always specified.
649 	 */
650 	chip = simple_strtoul(argv[1], NULL, 16);
651 
652 	/*
653 	 * Address is always specified.
654 	 */
655 	addr = simple_strtoul(argv[2], NULL, 16);
656 	alen = get_alen(argv[2], DEFAULT_ADDR_LEN);
657 	if (alen > 3)
658 		return CMD_RET_USAGE;
659 
660 #ifdef CONFIG_DM_I2C
661 	ret = i2c_get_cur_bus_chip(chip, &dev);
662 	if (!ret && alen != -1)
663 		ret = i2c_set_chip_offset_len(dev, alen);
664 	if (ret)
665 		return i2c_report_err(ret, I2C_ERR_WRITE);
666 #endif
667 	/*
668 	 * Value to write is always specified.
669 	 */
670 	byte = simple_strtoul(argv[3], NULL, 16);
671 
672 	/*
673 	 * Optional count
674 	 */
675 	if (argc == 5)
676 		count = simple_strtoul(argv[4], NULL, 16);
677 	else
678 		count = 1;
679 
680 	while (count-- > 0) {
681 #ifdef CONFIG_DM_I2C
682 		ret = dm_i2c_write(dev, addr++, &byte, 1);
683 #else
684 		ret = i2c_write(chip, addr++, alen, &byte, 1);
685 #endif
686 		if (ret)
687 			return i2c_report_err(ret, I2C_ERR_WRITE);
688 		/*
689 		 * Wait for the write to complete.  The write can take
690 		 * up to 10mSec (we allow a little more time).
691 		 */
692 /*
693  * No write delay with FRAM devices.
694  */
695 #if !defined(CONFIG_SYS_I2C_FRAM)
696 		udelay(11000);
697 #endif
698 	}
699 
700 	return 0;
701 }
702 
703 /**
704  * do_i2c_crc() - Handle the "i2c crc32" command-line command
705  * @cmdtp:	Command data struct pointer
706  * @flag:	Command flag
707  * @argc:	Command-line argument count
708  * @argv:	Array of command-line arguments
709  *
710  * Calculate a CRC on memory
711  *
712  * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
713  * on error.
714  *
715  * Syntax:
716  *	i2c crc32 {i2c_chip} {addr}{.0, .1, .2} {count}
717  */
718 static int do_i2c_crc (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
719 {
720 	uint	chip;
721 	ulong	addr;
722 	int	alen;
723 	int	count;
724 	uchar	byte;
725 	ulong	crc;
726 	ulong	err;
727 	int ret = 0;
728 #ifdef CONFIG_DM_I2C
729 	struct udevice *dev;
730 #endif
731 
732 	if (argc < 4)
733 		return CMD_RET_USAGE;
734 
735 	/*
736 	 * Chip is always specified.
737 	 */
738 	chip = simple_strtoul(argv[1], NULL, 16);
739 
740 	/*
741 	 * Address is always specified.
742 	 */
743 	addr = simple_strtoul(argv[2], NULL, 16);
744 	alen = get_alen(argv[2], DEFAULT_ADDR_LEN);
745 	if (alen > 3)
746 		return CMD_RET_USAGE;
747 
748 #ifdef CONFIG_DM_I2C
749 	ret = i2c_get_cur_bus_chip(chip, &dev);
750 	if (!ret && alen != -1)
751 		ret = i2c_set_chip_offset_len(dev, alen);
752 	if (ret)
753 		return i2c_report_err(ret, I2C_ERR_READ);
754 #endif
755 	/*
756 	 * Count is always specified
757 	 */
758 	count = simple_strtoul(argv[3], NULL, 16);
759 
760 	printf ("CRC32 for %08lx ... %08lx ==> ", addr, addr + count - 1);
761 	/*
762 	 * CRC a byte at a time.  This is going to be slooow, but hey, the
763 	 * memories are small and slow too so hopefully nobody notices.
764 	 */
765 	crc = 0;
766 	err = 0;
767 	while (count-- > 0) {
768 #ifdef CONFIG_DM_I2C
769 		ret = dm_i2c_read(dev, addr, &byte, 1);
770 #else
771 		ret = i2c_read(chip, addr, alen, &byte, 1);
772 #endif
773 		if (ret)
774 			err++;
775 		crc = crc32 (crc, &byte, 1);
776 		addr++;
777 	}
778 	if (err > 0)
779 		i2c_report_err(ret, I2C_ERR_READ);
780 	else
781 		printf ("%08lx\n", crc);
782 
783 	return 0;
784 }
785 
786 /**
787  * mod_i2c_mem() - Handle the "i2c mm" and "i2c nm" command-line command
788  * @cmdtp:	Command data struct pointer
789  * @flag:	Command flag
790  * @argc:	Command-line argument count
791  * @argv:	Array of command-line arguments
792  *
793  * Modify memory.
794  *
795  * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
796  * on error.
797  *
798  * Syntax:
799  *	i2c mm{.b, .w, .l} {i2c_chip} {addr}{.0, .1, .2}
800  *	i2c nm{.b, .w, .l} {i2c_chip} {addr}{.0, .1, .2}
801  */
802 static int
803 mod_i2c_mem(cmd_tbl_t *cmdtp, int incrflag, int flag, int argc, char * const argv[])
804 {
805 	uint	chip;
806 	ulong	addr;
807 	int	alen;
808 	ulong	data;
809 	int	size = 1;
810 	int	nbytes;
811 	int ret;
812 #ifdef CONFIG_DM_I2C
813 	struct udevice *dev;
814 #endif
815 
816 	if (argc != 3)
817 		return CMD_RET_USAGE;
818 
819 	bootretry_reset_cmd_timeout();	/* got a good command to get here */
820 	/*
821 	 * We use the last specified parameters, unless new ones are
822 	 * entered.
823 	 */
824 	chip = i2c_mm_last_chip;
825 	addr = i2c_mm_last_addr;
826 	alen = i2c_mm_last_alen;
827 
828 	if ((flag & CMD_FLAG_REPEAT) == 0) {
829 		/*
830 		 * New command specified.  Check for a size specification.
831 		 * Defaults to byte if no or incorrect specification.
832 		 */
833 		size = cmd_get_data_size(argv[0], 1);
834 
835 		/*
836 		 * Chip is always specified.
837 		 */
838 		chip = simple_strtoul(argv[1], NULL, 16);
839 
840 		/*
841 		 * Address is always specified.
842 		 */
843 		addr = simple_strtoul(argv[2], NULL, 16);
844 		alen = get_alen(argv[2], DEFAULT_ADDR_LEN);
845 		if (alen > 3)
846 			return CMD_RET_USAGE;
847 	}
848 
849 #ifdef CONFIG_DM_I2C
850 	ret = i2c_get_cur_bus_chip(chip, &dev);
851 	if (!ret && alen != -1)
852 		ret = i2c_set_chip_offset_len(dev, alen);
853 	if (ret)
854 		return i2c_report_err(ret, I2C_ERR_WRITE);
855 #endif
856 
857 	/*
858 	 * Print the address, followed by value.  Then accept input for
859 	 * the next value.  A non-converted value exits.
860 	 */
861 	do {
862 		printf("%08lx:", addr);
863 #ifdef CONFIG_DM_I2C
864 		ret = dm_i2c_read(dev, addr, (uchar *)&data, size);
865 #else
866 		ret = i2c_read(chip, addr, alen, (uchar *)&data, size);
867 #endif
868 		if (ret)
869 			return i2c_report_err(ret, I2C_ERR_READ);
870 
871 		data = cpu_to_be32(data);
872 		if (size == 1)
873 			printf(" %02lx", (data >> 24) & 0x000000FF);
874 		else if (size == 2)
875 			printf(" %04lx", (data >> 16) & 0x0000FFFF);
876 		else
877 			printf(" %08lx", data);
878 
879 		nbytes = cli_readline(" ? ");
880 		if (nbytes == 0) {
881 			/*
882 			 * <CR> pressed as only input, don't modify current
883 			 * location and move to next.
884 			 */
885 			if (incrflag)
886 				addr += size;
887 			nbytes = size;
888 			/* good enough to not time out */
889 			bootretry_reset_cmd_timeout();
890 		}
891 #ifdef CONFIG_BOOT_RETRY_TIME
892 		else if (nbytes == -2)
893 			break;	/* timed out, exit the command	*/
894 #endif
895 		else {
896 			char *endp;
897 
898 			data = simple_strtoul(console_buffer, &endp, 16);
899 			if (size == 1)
900 				data = data << 24;
901 			else if (size == 2)
902 				data = data << 16;
903 			data = be32_to_cpu(data);
904 			nbytes = endp - console_buffer;
905 			if (nbytes) {
906 				/*
907 				 * good enough to not time out
908 				 */
909 				bootretry_reset_cmd_timeout();
910 #ifdef CONFIG_DM_I2C
911 				ret = dm_i2c_write(dev, addr, (uchar *)&data,
912 						   size);
913 #else
914 				ret = i2c_write(chip, addr, alen,
915 						(uchar *)&data, size);
916 #endif
917 				if (ret)
918 					return i2c_report_err(ret,
919 							      I2C_ERR_WRITE);
920 #ifdef CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS
921 				udelay(CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS * 1000);
922 #endif
923 				if (incrflag)
924 					addr += size;
925 			}
926 		}
927 	} while (nbytes);
928 
929 	i2c_mm_last_chip = chip;
930 	i2c_mm_last_addr = addr;
931 	i2c_mm_last_alen = alen;
932 
933 	return 0;
934 }
935 
936 /**
937  * do_i2c_probe() - Handle the "i2c probe" command-line command
938  * @cmdtp:	Command data struct pointer
939  * @flag:	Command flag
940  * @argc:	Command-line argument count
941  * @argv:	Array of command-line arguments
942  *
943  * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
944  * on error.
945  *
946  * Syntax:
947  *	i2c probe {addr}
948  *
949  * Returns zero (success) if one or more I2C devices was found
950  */
951 static int do_i2c_probe (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
952 {
953 	int j;
954 	int addr = -1;
955 	int found = 0;
956 #if defined(CONFIG_SYS_I2C_NOPROBES)
957 	int k, skip;
958 	unsigned int bus = GET_BUS_NUM;
959 #endif	/* NOPROBES */
960 	int ret;
961 #ifdef CONFIG_DM_I2C
962 	struct udevice *bus, *dev;
963 
964 	if (i2c_get_cur_bus(&bus))
965 		return CMD_RET_FAILURE;
966 #endif
967 
968 	if (argc == 2)
969 		addr = simple_strtol(argv[1], 0, 16);
970 
971 	puts ("Valid chip addresses:");
972 	for (j = 0; j < 128; j++) {
973 		if ((0 <= addr) && (j != addr))
974 			continue;
975 
976 #if defined(CONFIG_SYS_I2C_NOPROBES)
977 		skip = 0;
978 		for (k = 0; k < ARRAY_SIZE(i2c_no_probes); k++) {
979 			if (COMPARE_BUS(bus, k) && COMPARE_ADDR(j, k)) {
980 				skip = 1;
981 				break;
982 			}
983 		}
984 		if (skip)
985 			continue;
986 #endif
987 #ifdef CONFIG_DM_I2C
988 		ret = dm_i2c_probe(bus, j, 0, &dev);
989 #else
990 		ret = i2c_probe(j);
991 #endif
992 		if (ret == 0) {
993 			printf(" %02X", j);
994 			found++;
995 		}
996 	}
997 	putc ('\n');
998 
999 #if defined(CONFIG_SYS_I2C_NOPROBES)
1000 	puts ("Excluded chip addresses:");
1001 	for (k = 0; k < ARRAY_SIZE(i2c_no_probes); k++) {
1002 		if (COMPARE_BUS(bus,k))
1003 			printf(" %02X", NO_PROBE_ADDR(k));
1004 	}
1005 	putc ('\n');
1006 #endif
1007 
1008 	return (0 == found);
1009 }
1010 
1011 /**
1012  * do_i2c_loop() - Handle the "i2c loop" command-line command
1013  * @cmdtp:	Command data struct pointer
1014  * @flag:	Command flag
1015  * @argc:	Command-line argument count
1016  * @argv:	Array of command-line arguments
1017  *
1018  * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
1019  * on error.
1020  *
1021  * Syntax:
1022  *	i2c loop {i2c_chip} {addr}{.0, .1, .2} [{length}] [{delay}]
1023  *	{length} - Number of bytes to read
1024  *	{delay}  - A DECIMAL number and defaults to 1000 uSec
1025  */
1026 static int do_i2c_loop(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
1027 {
1028 	uint	chip;
1029 	int alen;
1030 	uint	addr;
1031 	uint	length;
1032 	u_char	bytes[16];
1033 	int	delay;
1034 	int ret;
1035 #ifdef CONFIG_DM_I2C
1036 	struct udevice *dev;
1037 #endif
1038 
1039 	if (argc < 3)
1040 		return CMD_RET_USAGE;
1041 
1042 	/*
1043 	 * Chip is always specified.
1044 	 */
1045 	chip = simple_strtoul(argv[1], NULL, 16);
1046 
1047 	/*
1048 	 * Address is always specified.
1049 	 */
1050 	addr = simple_strtoul(argv[2], NULL, 16);
1051 	alen = get_alen(argv[2], DEFAULT_ADDR_LEN);
1052 	if (alen > 3)
1053 		return CMD_RET_USAGE;
1054 #ifdef CONFIG_DM_I2C
1055 	ret = i2c_get_cur_bus_chip(chip, &dev);
1056 	if (!ret && alen != -1)
1057 		ret = i2c_set_chip_offset_len(dev, alen);
1058 	if (ret)
1059 		return i2c_report_err(ret, I2C_ERR_WRITE);
1060 #endif
1061 
1062 	/*
1063 	 * Length is the number of objects, not number of bytes.
1064 	 */
1065 	length = 1;
1066 	length = simple_strtoul(argv[3], NULL, 16);
1067 	if (length > sizeof(bytes))
1068 		length = sizeof(bytes);
1069 
1070 	/*
1071 	 * The delay time (uSec) is optional.
1072 	 */
1073 	delay = 1000;
1074 	if (argc > 3)
1075 		delay = simple_strtoul(argv[4], NULL, 10);
1076 	/*
1077 	 * Run the loop...
1078 	 */
1079 	while (1) {
1080 #ifdef CONFIG_DM_I2C
1081 		ret = dm_i2c_read(dev, addr, bytes, length);
1082 #else
1083 		ret = i2c_read(chip, addr, alen, bytes, length);
1084 #endif
1085 		if (ret)
1086 			i2c_report_err(ret, I2C_ERR_READ);
1087 		udelay(delay);
1088 	}
1089 
1090 	/* NOTREACHED */
1091 	return 0;
1092 }
1093 
1094 /*
1095  * The SDRAM command is separately configured because many
1096  * (most?) embedded boards don't use SDRAM DIMMs.
1097  *
1098  * FIXME: Document and probably move elsewhere!
1099  */
1100 #if defined(CONFIG_CMD_SDRAM)
1101 static void print_ddr2_tcyc (u_char const b)
1102 {
1103 	printf ("%d.", (b >> 4) & 0x0F);
1104 	switch (b & 0x0F) {
1105 	case 0x0:
1106 	case 0x1:
1107 	case 0x2:
1108 	case 0x3:
1109 	case 0x4:
1110 	case 0x5:
1111 	case 0x6:
1112 	case 0x7:
1113 	case 0x8:
1114 	case 0x9:
1115 		printf ("%d ns\n", b & 0x0F);
1116 		break;
1117 	case 0xA:
1118 		puts ("25 ns\n");
1119 		break;
1120 	case 0xB:
1121 		puts ("33 ns\n");
1122 		break;
1123 	case 0xC:
1124 		puts ("66 ns\n");
1125 		break;
1126 	case 0xD:
1127 		puts ("75 ns\n");
1128 		break;
1129 	default:
1130 		puts ("?? ns\n");
1131 		break;
1132 	}
1133 }
1134 
1135 static void decode_bits (u_char const b, char const *str[], int const do_once)
1136 {
1137 	u_char mask;
1138 
1139 	for (mask = 0x80; mask != 0x00; mask >>= 1, ++str) {
1140 		if (b & mask) {
1141 			puts (*str);
1142 			if (do_once)
1143 				return;
1144 		}
1145 	}
1146 }
1147 
1148 /*
1149  * Syntax:
1150  *	i2c sdram {i2c_chip}
1151  */
1152 static int do_sdram (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
1153 {
1154 	enum { unknown, EDO, SDRAM, DDR, DDR2, DDR3, DDR4 } type;
1155 
1156 	uint	chip;
1157 	u_char	data[128];
1158 	u_char	cksum;
1159 	int	j, ret;
1160 #ifdef CONFIG_DM_I2C
1161 	struct udevice *dev;
1162 #endif
1163 
1164 	static const char *decode_CAS_DDR2[] = {
1165 		" TBD", " 6", " 5", " 4", " 3", " 2", " TBD", " TBD"
1166 	};
1167 
1168 	static const char *decode_CAS_default[] = {
1169 		" TBD", " 7", " 6", " 5", " 4", " 3", " 2", " 1"
1170 	};
1171 
1172 	static const char *decode_CS_WE_default[] = {
1173 		" TBD", " 6", " 5", " 4", " 3", " 2", " 1", " 0"
1174 	};
1175 
1176 	static const char *decode_byte21_default[] = {
1177 		"  TBD (bit 7)\n",
1178 		"  Redundant row address\n",
1179 		"  Differential clock input\n",
1180 		"  Registerd DQMB inputs\n",
1181 		"  Buffered DQMB inputs\n",
1182 		"  On-card PLL\n",
1183 		"  Registered address/control lines\n",
1184 		"  Buffered address/control lines\n"
1185 	};
1186 
1187 	static const char *decode_byte22_DDR2[] = {
1188 		"  TBD (bit 7)\n",
1189 		"  TBD (bit 6)\n",
1190 		"  TBD (bit 5)\n",
1191 		"  TBD (bit 4)\n",
1192 		"  TBD (bit 3)\n",
1193 		"  Supports partial array self refresh\n",
1194 		"  Supports 50 ohm ODT\n",
1195 		"  Supports weak driver\n"
1196 	};
1197 
1198 	static const char *decode_row_density_DDR2[] = {
1199 		"512 MiB", "256 MiB", "128 MiB", "16 GiB",
1200 		"8 GiB", "4 GiB", "2 GiB", "1 GiB"
1201 	};
1202 
1203 	static const char *decode_row_density_default[] = {
1204 		"512 MiB", "256 MiB", "128 MiB", "64 MiB",
1205 		"32 MiB", "16 MiB", "8 MiB", "4 MiB"
1206 	};
1207 
1208 	if (argc < 2)
1209 		return CMD_RET_USAGE;
1210 
1211 	/*
1212 	 * Chip is always specified.
1213 	 */
1214 	chip = simple_strtoul (argv[1], NULL, 16);
1215 
1216 #ifdef CONFIG_DM_I2C
1217 	ret = i2c_get_cur_bus_chip(chip, &dev);
1218 	if (!ret)
1219 		ret = dm_i2c_read(dev, 0, data, sizeof(data));
1220 #else
1221 	ret = i2c_read(chip, 0, 1, data, sizeof(data));
1222 #endif
1223 	if (ret) {
1224 		puts ("No SDRAM Serial Presence Detect found.\n");
1225 		return 1;
1226 	}
1227 
1228 	cksum = 0;
1229 	for (j = 0; j < 63; j++) {
1230 		cksum += data[j];
1231 	}
1232 	if (cksum != data[63]) {
1233 		printf ("WARNING: Configuration data checksum failure:\n"
1234 			"  is 0x%02x, calculated 0x%02x\n", data[63], cksum);
1235 	}
1236 	printf ("SPD data revision            %d.%d\n",
1237 		(data[62] >> 4) & 0x0F, data[62] & 0x0F);
1238 	printf ("Bytes used                   0x%02X\n", data[0]);
1239 	printf ("Serial memory size           0x%02X\n", 1 << data[1]);
1240 
1241 	puts ("Memory type                  ");
1242 	switch (data[2]) {
1243 	case 2:
1244 		type = EDO;
1245 		puts ("EDO\n");
1246 		break;
1247 	case 4:
1248 		type = SDRAM;
1249 		puts ("SDRAM\n");
1250 		break;
1251 	case 7:
1252 		type = DDR;
1253 		puts("DDR\n");
1254 		break;
1255 	case 8:
1256 		type = DDR2;
1257 		puts ("DDR2\n");
1258 		break;
1259 	case 11:
1260 		type = DDR3;
1261 		puts("DDR3\n");
1262 		break;
1263 	case 12:
1264 		type = DDR4;
1265 		puts("DDR4\n");
1266 		break;
1267 	default:
1268 		type = unknown;
1269 		puts ("unknown\n");
1270 		break;
1271 	}
1272 
1273 	puts ("Row address bits             ");
1274 	if ((data[3] & 0x00F0) == 0)
1275 		printf ("%d\n", data[3] & 0x0F);
1276 	else
1277 		printf ("%d/%d\n", data[3] & 0x0F, (data[3] >> 4) & 0x0F);
1278 
1279 	puts ("Column address bits          ");
1280 	if ((data[4] & 0x00F0) == 0)
1281 		printf ("%d\n", data[4] & 0x0F);
1282 	else
1283 		printf ("%d/%d\n", data[4] & 0x0F, (data[4] >> 4) & 0x0F);
1284 
1285 	switch (type) {
1286 	case DDR2:
1287 		printf ("Number of ranks              %d\n",
1288 			(data[5] & 0x07) + 1);
1289 		break;
1290 	default:
1291 		printf ("Module rows                  %d\n", data[5]);
1292 		break;
1293 	}
1294 
1295 	switch (type) {
1296 	case DDR2:
1297 		printf ("Module data width            %d bits\n", data[6]);
1298 		break;
1299 	default:
1300 		printf ("Module data width            %d bits\n",
1301 			(data[7] << 8) | data[6]);
1302 		break;
1303 	}
1304 
1305 	puts ("Interface signal levels      ");
1306 	switch(data[8]) {
1307 		case 0:  puts ("TTL 5.0 V\n");	break;
1308 		case 1:  puts ("LVTTL\n");	break;
1309 		case 2:  puts ("HSTL 1.5 V\n");	break;
1310 		case 3:  puts ("SSTL 3.3 V\n");	break;
1311 		case 4:  puts ("SSTL 2.5 V\n");	break;
1312 		case 5:  puts ("SSTL 1.8 V\n");	break;
1313 		default: puts ("unknown\n");	break;
1314 	}
1315 
1316 	switch (type) {
1317 	case DDR2:
1318 		printf ("SDRAM cycle time             ");
1319 		print_ddr2_tcyc (data[9]);
1320 		break;
1321 	default:
1322 		printf ("SDRAM cycle time             %d.%d ns\n",
1323 			(data[9] >> 4) & 0x0F, data[9] & 0x0F);
1324 		break;
1325 	}
1326 
1327 	switch (type) {
1328 	case DDR2:
1329 		printf ("SDRAM access time            0.%d%d ns\n",
1330 			(data[10] >> 4) & 0x0F, data[10] & 0x0F);
1331 		break;
1332 	default:
1333 		printf ("SDRAM access time            %d.%d ns\n",
1334 			(data[10] >> 4) & 0x0F, data[10] & 0x0F);
1335 		break;
1336 	}
1337 
1338 	puts ("EDC configuration            ");
1339 	switch (data[11]) {
1340 		case 0:  puts ("None\n");	break;
1341 		case 1:  puts ("Parity\n");	break;
1342 		case 2:  puts ("ECC\n");	break;
1343 		default: puts ("unknown\n");	break;
1344 	}
1345 
1346 	if ((data[12] & 0x80) == 0)
1347 		puts ("No self refresh, rate        ");
1348 	else
1349 		puts ("Self refresh, rate           ");
1350 
1351 	switch(data[12] & 0x7F) {
1352 		case 0:  puts ("15.625 us\n");	break;
1353 		case 1:  puts ("3.9 us\n");	break;
1354 		case 2:  puts ("7.8 us\n");	break;
1355 		case 3:  puts ("31.3 us\n");	break;
1356 		case 4:  puts ("62.5 us\n");	break;
1357 		case 5:  puts ("125 us\n");	break;
1358 		default: puts ("unknown\n");	break;
1359 	}
1360 
1361 	switch (type) {
1362 	case DDR2:
1363 		printf ("SDRAM width (primary)        %d\n", data[13]);
1364 		break;
1365 	default:
1366 		printf ("SDRAM width (primary)        %d\n", data[13] & 0x7F);
1367 		if ((data[13] & 0x80) != 0) {
1368 			printf ("  (second bank)              %d\n",
1369 				2 * (data[13] & 0x7F));
1370 		}
1371 		break;
1372 	}
1373 
1374 	switch (type) {
1375 	case DDR2:
1376 		if (data[14] != 0)
1377 			printf ("EDC width                    %d\n", data[14]);
1378 		break;
1379 	default:
1380 		if (data[14] != 0) {
1381 			printf ("EDC width                    %d\n",
1382 				data[14] & 0x7F);
1383 
1384 			if ((data[14] & 0x80) != 0) {
1385 				printf ("  (second bank)              %d\n",
1386 					2 * (data[14] & 0x7F));
1387 			}
1388 		}
1389 		break;
1390 	}
1391 
1392 	if (DDR2 != type) {
1393 		printf ("Min clock delay, back-to-back random column addresses "
1394 			"%d\n", data[15]);
1395 	}
1396 
1397 	puts ("Burst length(s)             ");
1398 	if (data[16] & 0x80) puts (" Page");
1399 	if (data[16] & 0x08) puts (" 8");
1400 	if (data[16] & 0x04) puts (" 4");
1401 	if (data[16] & 0x02) puts (" 2");
1402 	if (data[16] & 0x01) puts (" 1");
1403 	putc ('\n');
1404 	printf ("Number of banks              %d\n", data[17]);
1405 
1406 	switch (type) {
1407 	case DDR2:
1408 		puts ("CAS latency(s)              ");
1409 		decode_bits (data[18], decode_CAS_DDR2, 0);
1410 		putc ('\n');
1411 		break;
1412 	default:
1413 		puts ("CAS latency(s)              ");
1414 		decode_bits (data[18], decode_CAS_default, 0);
1415 		putc ('\n');
1416 		break;
1417 	}
1418 
1419 	if (DDR2 != type) {
1420 		puts ("CS latency(s)               ");
1421 		decode_bits (data[19], decode_CS_WE_default, 0);
1422 		putc ('\n');
1423 	}
1424 
1425 	if (DDR2 != type) {
1426 		puts ("WE latency(s)               ");
1427 		decode_bits (data[20], decode_CS_WE_default, 0);
1428 		putc ('\n');
1429 	}
1430 
1431 	switch (type) {
1432 	case DDR2:
1433 		puts ("Module attributes:\n");
1434 		if (data[21] & 0x80)
1435 			puts ("  TBD (bit 7)\n");
1436 		if (data[21] & 0x40)
1437 			puts ("  Analysis probe installed\n");
1438 		if (data[21] & 0x20)
1439 			puts ("  TBD (bit 5)\n");
1440 		if (data[21] & 0x10)
1441 			puts ("  FET switch external enable\n");
1442 		printf ("  %d PLLs on DIMM\n", (data[21] >> 2) & 0x03);
1443 		if (data[20] & 0x11) {
1444 			printf ("  %d active registers on DIMM\n",
1445 				(data[21] & 0x03) + 1);
1446 		}
1447 		break;
1448 	default:
1449 		puts ("Module attributes:\n");
1450 		if (!data[21])
1451 			puts ("  (none)\n");
1452 		else
1453 			decode_bits (data[21], decode_byte21_default, 0);
1454 		break;
1455 	}
1456 
1457 	switch (type) {
1458 	case DDR2:
1459 		decode_bits (data[22], decode_byte22_DDR2, 0);
1460 		break;
1461 	default:
1462 		puts ("Device attributes:\n");
1463 		if (data[22] & 0x80) puts ("  TBD (bit 7)\n");
1464 		if (data[22] & 0x40) puts ("  TBD (bit 6)\n");
1465 		if (data[22] & 0x20) puts ("  Upper Vcc tolerance 5%\n");
1466 		else                 puts ("  Upper Vcc tolerance 10%\n");
1467 		if (data[22] & 0x10) puts ("  Lower Vcc tolerance 5%\n");
1468 		else                 puts ("  Lower Vcc tolerance 10%\n");
1469 		if (data[22] & 0x08) puts ("  Supports write1/read burst\n");
1470 		if (data[22] & 0x04) puts ("  Supports precharge all\n");
1471 		if (data[22] & 0x02) puts ("  Supports auto precharge\n");
1472 		if (data[22] & 0x01) puts ("  Supports early RAS# precharge\n");
1473 		break;
1474 	}
1475 
1476 	switch (type) {
1477 	case DDR2:
1478 		printf ("SDRAM cycle time (2nd highest CAS latency)        ");
1479 		print_ddr2_tcyc (data[23]);
1480 		break;
1481 	default:
1482 		printf ("SDRAM cycle time (2nd highest CAS latency)        %d."
1483 			"%d ns\n", (data[23] >> 4) & 0x0F, data[23] & 0x0F);
1484 		break;
1485 	}
1486 
1487 	switch (type) {
1488 	case DDR2:
1489 		printf ("SDRAM access from clock (2nd highest CAS latency) 0."
1490 			"%d%d ns\n", (data[24] >> 4) & 0x0F, data[24] & 0x0F);
1491 		break;
1492 	default:
1493 		printf ("SDRAM access from clock (2nd highest CAS latency) %d."
1494 			"%d ns\n", (data[24] >> 4) & 0x0F, data[24] & 0x0F);
1495 		break;
1496 	}
1497 
1498 	switch (type) {
1499 	case DDR2:
1500 		printf ("SDRAM cycle time (3rd highest CAS latency)        ");
1501 		print_ddr2_tcyc (data[25]);
1502 		break;
1503 	default:
1504 		printf ("SDRAM cycle time (3rd highest CAS latency)        %d."
1505 			"%d ns\n", (data[25] >> 4) & 0x0F, data[25] & 0x0F);
1506 		break;
1507 	}
1508 
1509 	switch (type) {
1510 	case DDR2:
1511 		printf ("SDRAM access from clock (3rd highest CAS latency) 0."
1512 			"%d%d ns\n", (data[26] >> 4) & 0x0F, data[26] & 0x0F);
1513 		break;
1514 	default:
1515 		printf ("SDRAM access from clock (3rd highest CAS latency) %d."
1516 			"%d ns\n", (data[26] >> 4) & 0x0F, data[26] & 0x0F);
1517 		break;
1518 	}
1519 
1520 	switch (type) {
1521 	case DDR2:
1522 		printf ("Minimum row precharge        %d.%02d ns\n",
1523 			(data[27] >> 2) & 0x3F, 25 * (data[27] & 0x03));
1524 		break;
1525 	default:
1526 		printf ("Minimum row precharge        %d ns\n", data[27]);
1527 		break;
1528 	}
1529 
1530 	switch (type) {
1531 	case DDR2:
1532 		printf ("Row active to row active min %d.%02d ns\n",
1533 			(data[28] >> 2) & 0x3F, 25 * (data[28] & 0x03));
1534 		break;
1535 	default:
1536 		printf ("Row active to row active min %d ns\n", data[28]);
1537 		break;
1538 	}
1539 
1540 	switch (type) {
1541 	case DDR2:
1542 		printf ("RAS to CAS delay min         %d.%02d ns\n",
1543 			(data[29] >> 2) & 0x3F, 25 * (data[29] & 0x03));
1544 		break;
1545 	default:
1546 		printf ("RAS to CAS delay min         %d ns\n", data[29]);
1547 		break;
1548 	}
1549 
1550 	printf ("Minimum RAS pulse width      %d ns\n", data[30]);
1551 
1552 	switch (type) {
1553 	case DDR2:
1554 		puts ("Density of each row          ");
1555 		decode_bits (data[31], decode_row_density_DDR2, 1);
1556 		putc ('\n');
1557 		break;
1558 	default:
1559 		puts ("Density of each row          ");
1560 		decode_bits (data[31], decode_row_density_default, 1);
1561 		putc ('\n');
1562 		break;
1563 	}
1564 
1565 	switch (type) {
1566 	case DDR2:
1567 		puts ("Command and Address setup    ");
1568 		if (data[32] >= 0xA0) {
1569 			printf ("1.%d%d ns\n",
1570 				((data[32] >> 4) & 0x0F) - 10, data[32] & 0x0F);
1571 		} else {
1572 			printf ("0.%d%d ns\n",
1573 				((data[32] >> 4) & 0x0F), data[32] & 0x0F);
1574 		}
1575 		break;
1576 	default:
1577 		printf ("Command and Address setup    %c%d.%d ns\n",
1578 			(data[32] & 0x80) ? '-' : '+',
1579 			(data[32] >> 4) & 0x07, data[32] & 0x0F);
1580 		break;
1581 	}
1582 
1583 	switch (type) {
1584 	case DDR2:
1585 		puts ("Command and Address hold     ");
1586 		if (data[33] >= 0xA0) {
1587 			printf ("1.%d%d ns\n",
1588 				((data[33] >> 4) & 0x0F) - 10, data[33] & 0x0F);
1589 		} else {
1590 			printf ("0.%d%d ns\n",
1591 				((data[33] >> 4) & 0x0F), data[33] & 0x0F);
1592 		}
1593 		break;
1594 	default:
1595 		printf ("Command and Address hold     %c%d.%d ns\n",
1596 			(data[33] & 0x80) ? '-' : '+',
1597 			(data[33] >> 4) & 0x07, data[33] & 0x0F);
1598 		break;
1599 	}
1600 
1601 	switch (type) {
1602 	case DDR2:
1603 		printf ("Data signal input setup      0.%d%d ns\n",
1604 			(data[34] >> 4) & 0x0F, data[34] & 0x0F);
1605 		break;
1606 	default:
1607 		printf ("Data signal input setup      %c%d.%d ns\n",
1608 			(data[34] & 0x80) ? '-' : '+',
1609 			(data[34] >> 4) & 0x07, data[34] & 0x0F);
1610 		break;
1611 	}
1612 
1613 	switch (type) {
1614 	case DDR2:
1615 		printf ("Data signal input hold       0.%d%d ns\n",
1616 			(data[35] >> 4) & 0x0F, data[35] & 0x0F);
1617 		break;
1618 	default:
1619 		printf ("Data signal input hold       %c%d.%d ns\n",
1620 			(data[35] & 0x80) ? '-' : '+',
1621 			(data[35] >> 4) & 0x07, data[35] & 0x0F);
1622 		break;
1623 	}
1624 
1625 	puts ("Manufacturer's JEDEC ID      ");
1626 	for (j = 64; j <= 71; j++)
1627 		printf ("%02X ", data[j]);
1628 	putc ('\n');
1629 	printf ("Manufacturing Location       %02X\n", data[72]);
1630 	puts ("Manufacturer's Part Number   ");
1631 	for (j = 73; j <= 90; j++)
1632 		printf ("%02X ", data[j]);
1633 	putc ('\n');
1634 	printf ("Revision Code                %02X %02X\n", data[91], data[92]);
1635 	printf ("Manufacturing Date           %02X %02X\n", data[93], data[94]);
1636 	puts ("Assembly Serial Number       ");
1637 	for (j = 95; j <= 98; j++)
1638 		printf ("%02X ", data[j]);
1639 	putc ('\n');
1640 
1641 	if (DDR2 != type) {
1642 		printf ("Speed rating                 PC%d\n",
1643 			data[126] == 0x66 ? 66 : data[126]);
1644 	}
1645 	return 0;
1646 }
1647 #endif
1648 
1649 /*
1650  * Syntax:
1651  *	i2c edid {i2c_chip}
1652  */
1653 #if defined(CONFIG_I2C_EDID)
1654 int do_edid(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
1655 {
1656 	uint chip;
1657 	struct edid1_info edid;
1658 	int ret;
1659 #ifdef CONFIG_DM_I2C
1660 	struct udevice *dev;
1661 #endif
1662 
1663 	if (argc < 2) {
1664 		cmd_usage(cmdtp);
1665 		return 1;
1666 	}
1667 
1668 	chip = simple_strtoul(argv[1], NULL, 16);
1669 #ifdef CONFIG_DM_I2C
1670 	ret = i2c_get_cur_bus_chip(chip, &dev);
1671 	if (!ret)
1672 		ret = dm_i2c_read(dev, 0, (uchar *)&edid, sizeof(edid));
1673 #else
1674 	ret = i2c_read(chip, 0, 1, (uchar *)&edid, sizeof(edid));
1675 #endif
1676 	if (ret)
1677 		return i2c_report_err(ret, I2C_ERR_READ);
1678 
1679 	if (edid_check_info(&edid)) {
1680 		puts("Content isn't valid EDID.\n");
1681 		return 1;
1682 	}
1683 
1684 	edid_print_info(&edid);
1685 	return 0;
1686 
1687 }
1688 #endif /* CONFIG_I2C_EDID */
1689 
1690 #ifdef CONFIG_DM_I2C
1691 static void show_bus(struct udevice *bus)
1692 {
1693 	struct udevice *dev;
1694 
1695 	printf("Bus %d:\t%s", bus->req_seq, bus->name);
1696 	if (device_active(bus))
1697 		printf("  (active %d)", bus->seq);
1698 	printf("\n");
1699 	for (device_find_first_child(bus, &dev);
1700 	     dev;
1701 	     device_find_next_child(&dev)) {
1702 		struct dm_i2c_chip *chip = dev_get_parent_platdata(dev);
1703 
1704 		printf("   %02x: %s, offset len %x, flags %x\n",
1705 		       chip->chip_addr, dev->name, chip->offset_len,
1706 		       chip->flags);
1707 	}
1708 }
1709 #endif
1710 
1711 /**
1712  * do_i2c_show_bus() - Handle the "i2c bus" command-line command
1713  * @cmdtp:	Command data struct pointer
1714  * @flag:	Command flag
1715  * @argc:	Command-line argument count
1716  * @argv:	Array of command-line arguments
1717  *
1718  * Returns zero always.
1719  */
1720 #if defined(CONFIG_SYS_I2C) || defined(CONFIG_DM_I2C)
1721 static int do_i2c_show_bus(cmd_tbl_t *cmdtp, int flag, int argc,
1722 				char * const argv[])
1723 {
1724 	if (argc == 1) {
1725 		/* show all busses */
1726 #ifdef CONFIG_DM_I2C
1727 		struct udevice *bus;
1728 		struct uclass *uc;
1729 		int ret;
1730 
1731 		ret = uclass_get(UCLASS_I2C, &uc);
1732 		if (ret)
1733 			return CMD_RET_FAILURE;
1734 		uclass_foreach_dev(bus, uc)
1735 			show_bus(bus);
1736 #else
1737 		int i;
1738 
1739 		for (i = 0; i < CONFIG_SYS_NUM_I2C_BUSES; i++) {
1740 			printf("Bus %d:\t%s", i, I2C_ADAP_NR(i)->name);
1741 #ifndef CONFIG_SYS_I2C_DIRECT_BUS
1742 			int j;
1743 
1744 			for (j = 0; j < CONFIG_SYS_I2C_MAX_HOPS; j++) {
1745 				if (i2c_bus[i].next_hop[j].chip == 0)
1746 					break;
1747 				printf("->%s@0x%2x:%d",
1748 				       i2c_bus[i].next_hop[j].mux.name,
1749 				       i2c_bus[i].next_hop[j].chip,
1750 				       i2c_bus[i].next_hop[j].channel);
1751 			}
1752 #endif
1753 			printf("\n");
1754 		}
1755 #endif
1756 	} else {
1757 		int i;
1758 
1759 		/* show specific bus */
1760 		i = simple_strtoul(argv[1], NULL, 10);
1761 #ifdef CONFIG_DM_I2C
1762 		struct udevice *bus;
1763 		int ret;
1764 
1765 		ret = uclass_get_device_by_seq(UCLASS_I2C, i, &bus);
1766 		if (ret) {
1767 			printf("Invalid bus %d: err=%d\n", i, ret);
1768 			return CMD_RET_FAILURE;
1769 		}
1770 		show_bus(bus);
1771 #else
1772 		if (i >= CONFIG_SYS_NUM_I2C_BUSES) {
1773 			printf("Invalid bus %d\n", i);
1774 			return -1;
1775 		}
1776 		printf("Bus %d:\t%s", i, I2C_ADAP_NR(i)->name);
1777 #ifndef CONFIG_SYS_I2C_DIRECT_BUS
1778 			int j;
1779 			for (j = 0; j < CONFIG_SYS_I2C_MAX_HOPS; j++) {
1780 				if (i2c_bus[i].next_hop[j].chip == 0)
1781 					break;
1782 				printf("->%s@0x%2x:%d",
1783 				       i2c_bus[i].next_hop[j].mux.name,
1784 				       i2c_bus[i].next_hop[j].chip,
1785 				       i2c_bus[i].next_hop[j].channel);
1786 			}
1787 #endif
1788 		printf("\n");
1789 #endif
1790 	}
1791 
1792 	return 0;
1793 }
1794 #endif
1795 
1796 /**
1797  * do_i2c_bus_num() - Handle the "i2c dev" command-line command
1798  * @cmdtp:	Command data struct pointer
1799  * @flag:	Command flag
1800  * @argc:	Command-line argument count
1801  * @argv:	Array of command-line arguments
1802  *
1803  * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
1804  * on error.
1805  */
1806 #if defined(CONFIG_SYS_I2C) || defined(CONFIG_I2C_MULTI_BUS) || \
1807 		defined(CONFIG_DM_I2C)
1808 static int do_i2c_bus_num(cmd_tbl_t *cmdtp, int flag, int argc,
1809 				char * const argv[])
1810 {
1811 	int		ret = 0;
1812 	int	bus_no;
1813 
1814 	if (argc == 1) {
1815 		/* querying current setting */
1816 #ifdef CONFIG_DM_I2C
1817 		struct udevice *bus;
1818 
1819 		if (!i2c_get_cur_bus(&bus))
1820 			bus_no = bus->seq;
1821 		else
1822 			bus_no = -1;
1823 #else
1824 		bus_no = i2c_get_bus_num();
1825 #endif
1826 		printf("Current bus is %d\n", bus_no);
1827 	} else {
1828 		bus_no = simple_strtoul(argv[1], NULL, 10);
1829 #if defined(CONFIG_SYS_I2C)
1830 		if (bus_no >= CONFIG_SYS_NUM_I2C_BUSES) {
1831 			printf("Invalid bus %d\n", bus_no);
1832 			return -1;
1833 		}
1834 #endif
1835 		printf("Setting bus to %d\n", bus_no);
1836 #ifdef CONFIG_DM_I2C
1837 		ret = cmd_i2c_set_bus_num(bus_no);
1838 #else
1839 		ret = i2c_set_bus_num(bus_no);
1840 #endif
1841 		if (ret)
1842 			printf("Failure changing bus number (%d)\n", ret);
1843 	}
1844 
1845 	return ret ? CMD_RET_FAILURE : 0;
1846 }
1847 #endif  /* defined(CONFIG_SYS_I2C) */
1848 
1849 /**
1850  * do_i2c_bus_speed() - Handle the "i2c speed" command-line command
1851  * @cmdtp:	Command data struct pointer
1852  * @flag:	Command flag
1853  * @argc:	Command-line argument count
1854  * @argv:	Array of command-line arguments
1855  *
1856  * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
1857  * on error.
1858  */
1859 static int do_i2c_bus_speed(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
1860 {
1861 	int speed, ret=0;
1862 
1863 #ifdef CONFIG_DM_I2C
1864 	struct udevice *bus;
1865 
1866 	if (i2c_get_cur_bus(&bus))
1867 		return 1;
1868 #endif
1869 	if (argc == 1) {
1870 #ifdef CONFIG_DM_I2C
1871 		speed = dm_i2c_get_bus_speed(bus);
1872 #else
1873 		speed = i2c_get_bus_speed();
1874 #endif
1875 		/* querying current speed */
1876 		printf("Current bus speed=%d\n", speed);
1877 	} else {
1878 		speed = simple_strtoul(argv[1], NULL, 10);
1879 		printf("Setting bus speed to %d Hz\n", speed);
1880 #ifdef CONFIG_DM_I2C
1881 		ret = dm_i2c_set_bus_speed(bus, speed);
1882 #else
1883 		ret = i2c_set_bus_speed(speed);
1884 #endif
1885 		if (ret)
1886 			printf("Failure changing bus speed (%d)\n", ret);
1887 	}
1888 
1889 	return ret ? CMD_RET_FAILURE : 0;
1890 }
1891 
1892 /**
1893  * do_i2c_mm() - Handle the "i2c mm" command-line command
1894  * @cmdtp:	Command data struct pointer
1895  * @flag:	Command flag
1896  * @argc:	Command-line argument count
1897  * @argv:	Array of command-line arguments
1898  *
1899  * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
1900  * on error.
1901  */
1902 static int do_i2c_mm(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
1903 {
1904 	return mod_i2c_mem (cmdtp, 1, flag, argc, argv);
1905 }
1906 
1907 /**
1908  * do_i2c_nm() - Handle the "i2c nm" command-line command
1909  * @cmdtp:	Command data struct pointer
1910  * @flag:	Command flag
1911  * @argc:	Command-line argument count
1912  * @argv:	Array of command-line arguments
1913  *
1914  * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
1915  * on error.
1916  */
1917 static int do_i2c_nm(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
1918 {
1919 	return mod_i2c_mem (cmdtp, 0, flag, argc, argv);
1920 }
1921 
1922 /**
1923  * do_i2c_reset() - Handle the "i2c reset" command-line command
1924  * @cmdtp:	Command data struct pointer
1925  * @flag:	Command flag
1926  * @argc:	Command-line argument count
1927  * @argv:	Array of command-line arguments
1928  *
1929  * Returns zero always.
1930  */
1931 static int do_i2c_reset(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
1932 {
1933 #if defined(CONFIG_DM_I2C)
1934 	struct udevice *bus;
1935 
1936 	if (i2c_get_cur_bus(&bus))
1937 		return CMD_RET_FAILURE;
1938 	if (i2c_deblock(bus)) {
1939 		printf("Error: Not supported by the driver\n");
1940 		return CMD_RET_FAILURE;
1941 	}
1942 #elif defined(CONFIG_SYS_I2C)
1943 	i2c_init(I2C_ADAP->speed, I2C_ADAP->slaveaddr);
1944 #else
1945 	i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
1946 #endif
1947 	return 0;
1948 }
1949 
1950 static cmd_tbl_t cmd_i2c_sub[] = {
1951 #if defined(CONFIG_SYS_I2C) || defined(CONFIG_DM_I2C)
1952 	U_BOOT_CMD_MKENT(bus, 1, 1, do_i2c_show_bus, "", ""),
1953 #endif
1954 	U_BOOT_CMD_MKENT(crc32, 3, 1, do_i2c_crc, "", ""),
1955 #if defined(CONFIG_SYS_I2C) || \
1956 	defined(CONFIG_I2C_MULTI_BUS) || defined(CONFIG_DM_I2C)
1957 	U_BOOT_CMD_MKENT(dev, 1, 1, do_i2c_bus_num, "", ""),
1958 #endif  /* CONFIG_I2C_MULTI_BUS */
1959 #if defined(CONFIG_I2C_EDID)
1960 	U_BOOT_CMD_MKENT(edid, 1, 1, do_edid, "", ""),
1961 #endif  /* CONFIG_I2C_EDID */
1962 	U_BOOT_CMD_MKENT(loop, 3, 1, do_i2c_loop, "", ""),
1963 	U_BOOT_CMD_MKENT(md, 3, 1, do_i2c_md, "", ""),
1964 	U_BOOT_CMD_MKENT(mm, 2, 1, do_i2c_mm, "", ""),
1965 	U_BOOT_CMD_MKENT(mw, 3, 1, do_i2c_mw, "", ""),
1966 	U_BOOT_CMD_MKENT(nm, 2, 1, do_i2c_nm, "", ""),
1967 	U_BOOT_CMD_MKENT(probe, 0, 1, do_i2c_probe, "", ""),
1968 	U_BOOT_CMD_MKENT(read, 5, 1, do_i2c_read, "", ""),
1969 	U_BOOT_CMD_MKENT(write, 6, 0, do_i2c_write, "", ""),
1970 #ifdef CONFIG_DM_I2C
1971 	U_BOOT_CMD_MKENT(flags, 2, 1, do_i2c_flags, "", ""),
1972 	U_BOOT_CMD_MKENT(olen, 2, 1, do_i2c_olen, "", ""),
1973 #endif
1974 	U_BOOT_CMD_MKENT(reset, 0, 1, do_i2c_reset, "", ""),
1975 #if defined(CONFIG_CMD_SDRAM)
1976 	U_BOOT_CMD_MKENT(sdram, 1, 1, do_sdram, "", ""),
1977 #endif
1978 	U_BOOT_CMD_MKENT(speed, 1, 1, do_i2c_bus_speed, "", ""),
1979 };
1980 
1981 static __maybe_unused void i2c_reloc(void)
1982 {
1983 	static int relocated;
1984 
1985 	if (!relocated) {
1986 		fixup_cmdtable(cmd_i2c_sub, ARRAY_SIZE(cmd_i2c_sub));
1987 		relocated = 1;
1988 	};
1989 }
1990 
1991 /**
1992  * do_i2c() - Handle the "i2c" command-line command
1993  * @cmdtp:	Command data struct pointer
1994  * @flag:	Command flag
1995  * @argc:	Command-line argument count
1996  * @argv:	Array of command-line arguments
1997  *
1998  * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
1999  * on error.
2000  */
2001 static int do_i2c(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
2002 {
2003 	cmd_tbl_t *c;
2004 
2005 #ifdef CONFIG_NEEDS_MANUAL_RELOC
2006 	i2c_reloc();
2007 #endif
2008 
2009 	if (argc < 2)
2010 		return CMD_RET_USAGE;
2011 
2012 	/* Strip off leading 'i2c' command argument */
2013 	argc--;
2014 	argv++;
2015 
2016 	c = find_cmd_tbl(argv[0], &cmd_i2c_sub[0], ARRAY_SIZE(cmd_i2c_sub));
2017 
2018 	if (c)
2019 		return c->cmd(cmdtp, flag, argc, argv);
2020 	else
2021 		return CMD_RET_USAGE;
2022 }
2023 
2024 /***************************************************/
2025 #ifdef CONFIG_SYS_LONGHELP
2026 static char i2c_help_text[] =
2027 #if defined(CONFIG_SYS_I2C) || defined(CONFIG_DM_I2C)
2028 	"bus [muxtype:muxaddr:muxchannel] - show I2C bus info\n"
2029 #endif
2030 	"crc32 chip address[.0, .1, .2] count - compute CRC32 checksum\n"
2031 #if defined(CONFIG_SYS_I2C) || \
2032 	defined(CONFIG_I2C_MULTI_BUS) || defined(CONFIG_DM_I2C)
2033 	"i2c dev [dev] - show or set current I2C bus\n"
2034 #endif  /* CONFIG_I2C_MULTI_BUS */
2035 #if defined(CONFIG_I2C_EDID)
2036 	"i2c edid chip - print EDID configuration information\n"
2037 #endif  /* CONFIG_I2C_EDID */
2038 	"i2c loop chip address[.0, .1, .2] [# of objects] - looping read of device\n"
2039 	"i2c md chip address[.0, .1, .2] [# of objects] - read from I2C device\n"
2040 	"i2c mm chip address[.0, .1, .2] - write to I2C device (auto-incrementing)\n"
2041 	"i2c mw chip address[.0, .1, .2] value [count] - write to I2C device (fill)\n"
2042 	"i2c nm chip address[.0, .1, .2] - write to I2C device (constant address)\n"
2043 	"i2c probe [address] - test for and show device(s) on the I2C bus\n"
2044 	"i2c read chip address[.0, .1, .2] length memaddress - read to memory\n"
2045 	"i2c write memaddress chip address[.0, .1, .2] length [-s] - write memory\n"
2046 	"          to I2C; the -s option selects bulk write in a single transaction\n"
2047 #ifdef CONFIG_DM_I2C
2048 	"i2c flags chip [flags] - set or get chip flags\n"
2049 	"i2c olen chip [offset_length] - set or get chip offset length\n"
2050 #endif
2051 	"i2c reset - re-init the I2C Controller\n"
2052 #if defined(CONFIG_CMD_SDRAM)
2053 	"i2c sdram chip - print SDRAM configuration information\n"
2054 #endif
2055 	"i2c speed [speed] - show or set I2C bus speed";
2056 #endif
2057 
2058 U_BOOT_CMD(
2059 	i2c, 7, 1, do_i2c,
2060 	"I2C sub-system",
2061 	i2c_help_text
2062 );
2063