1 /*
2 * (C) Copyright 2001
3 * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com.
4 *
5 * See file CREDITS for list of people who contributed to this
6 * project.
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21 * MA 02111-1307 USA
22 */
24 /*
25 * I2C Functions similar to the standard memory functions.
26 *
27 * There are several parameters in many of the commands that bear further
28 * explanations:
29 *
30 * {i2c_chip} is the I2C chip address (the first byte sent on the bus).
31 * Each I2C chip on the bus has a unique address. On the I2C data bus,
32 * the address is the upper seven bits and the LSB is the "read/write"
33 * bit. Note that the {i2c_chip} address specified on the command
34 * line is not shifted up: e.g. a typical EEPROM memory chip may have
35 * an I2C address of 0x50, but the data put on the bus will be 0xA0
36 * for write and 0xA1 for read. This "non shifted" address notation
37 * matches at least half of the data sheets :-/.
38 *
39 * {addr} is the address (or offset) within the chip. Small memory
40 * chips have 8 bit addresses. Large memory chips have 16 bit
41 * addresses. Other memory chips have 9, 10, or 11 bit addresses.
42 * Many non-memory chips have multiple registers and {addr} is used
43 * as the register index. Some non-memory chips have only one register
44 * and therefore don't need any {addr} parameter.
45 *
46 * The default {addr} parameter is one byte (.1) which works well for
47 * memories and registers with 8 bits of address space.
48 *
49 * You can specify the length of the {addr} field with the optional .0,
50 * .1, or .2 modifier (similar to the .b, .w, .l modifier). If you are
51 * manipulating a single register device which doesn't use an address
52 * field, use "0.0" for the address and the ".0" length field will
53 * suppress the address in the I2C data stream. This also works for
54 * successive reads using the I2C auto-incrementing memory pointer.
55 *
56 * If you are manipulating a large memory with 2-byte addresses, use
57 * the .2 address modifier, e.g. 210.2 addresses location 528 (decimal).
58 *
59 * Then there are the unfortunate memory chips that spill the most
60 * significant 1, 2, or 3 bits of address into the chip address byte.
61 * This effectively makes one chip (logically) look like 2, 4, or
62 * 8 chips. This is handled (awkwardly) by #defining
63 * CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW and using the .1 modifier on the
64 * {addr} field (since .1 is the default, it doesn't actually have to
65 * be specified). Examples: given a memory chip at I2C chip address
66 * 0x50, the following would happen...
67 * i2c md 50 0 10 display 16 bytes starting at 0x000
68 * On the bus: <S> A0 00 <E> <S> A1 <rd> ... <rd>
69 * i2c md 50 100 10 display 16 bytes starting at 0x100
70 * On the bus: <S> A2 00 <E> <S> A3 <rd> ... <rd>
71 * i2c md 50 210 10 display 16 bytes starting at 0x210
72 * On the bus: <S> A4 10 <E> <S> A5 <rd> ... <rd>
73 * This is awfully ugly. It would be nice if someone would think up
74 * a better way of handling this.
75 *
76 * Adapted from cmd_mem.c which is copyright Wolfgang Denk (wd@denx.de).
77 */
79 #include <common.h>
80 #include <command.h>
81 #include <edid.h>
82 #include <environment.h>
83 #include <i2c.h>
84 #include <malloc.h>
85 #include <asm/byteorder.h>
86 #include <linux/compiler.h>
88 /* Display values from last command.
89 * Memory modify remembered values are different from display memory.
90 */
91 static uchar i2c_dp_last_chip;
92 static uint i2c_dp_last_addr;
93 static uint i2c_dp_last_alen;
94 static uint i2c_dp_last_length = 0x10;
96 static uchar i2c_mm_last_chip;
97 static uint i2c_mm_last_addr;
98 static uint i2c_mm_last_alen;
100 /* If only one I2C bus is present, the list of devices to ignore when
101 * the probe command is issued is represented by a 1D array of addresses.
102 * When multiple buses are present, the list is an array of bus-address
103 * pairs. The following macros take care of this */
105 #if defined(CONFIG_SYS_I2C_NOPROBES)
106 #if defined(CONFIG_I2C_MULTI_BUS)
107 static struct
108 {
109 uchar bus;
110 uchar addr;
111 } i2c_no_probes[] = CONFIG_SYS_I2C_NOPROBES;
112 #define GET_BUS_NUM i2c_get_bus_num()
113 #define COMPARE_BUS(b,i) (i2c_no_probes[(i)].bus == (b))
114 #define COMPARE_ADDR(a,i) (i2c_no_probes[(i)].addr == (a))
115 #define NO_PROBE_ADDR(i) i2c_no_probes[(i)].addr
116 #else /* single bus */
117 static uchar i2c_no_probes[] = CONFIG_SYS_I2C_NOPROBES;
118 #define GET_BUS_NUM 0
119 #define COMPARE_BUS(b,i) ((b) == 0) /* Make compiler happy */
120 #define COMPARE_ADDR(a,i) (i2c_no_probes[(i)] == (a))
121 #define NO_PROBE_ADDR(i) i2c_no_probes[(i)]
122 #endif /* CONFIG_MULTI_BUS */
124 #define NUM_ELEMENTS_NOPROBE (sizeof(i2c_no_probes)/sizeof(i2c_no_probes[0]))
125 #endif
127 #if defined(CONFIG_I2C_MUX)
128 static I2C_MUX_DEVICE *i2c_mux_devices = NULL;
129 static int i2c_mux_busid = CONFIG_SYS_MAX_I2C_BUS;
131 DECLARE_GLOBAL_DATA_PTR;
133 #endif
135 #define DISP_LINE_LEN 16
137 /**
138 * i2c_init_board() - Board-specific I2C bus init
139 *
140 * This function is the default no-op implementation of I2C bus
141 * initialization. This function can be overriden by board-specific
142 * implementation if needed.
143 */
144 __weak
145 void i2c_init_board(void)
146 {
147 return;
148 }
150 /* TODO: Implement architecture-specific get/set functions */
152 /**
153 * i2c_get_bus_speed() - Return I2C bus speed
154 *
155 * This function is the default implementation of function for retrieveing
156 * the current I2C bus speed in Hz.
157 *
158 * A driver implementing runtime switching of I2C bus speed must override
159 * this function to report the speed correctly. Simple or legacy drivers
160 * can use this fallback.
161 *
162 * Returns I2C bus speed in Hz.
163 */
164 __weak
165 unsigned int i2c_get_bus_speed(void)
166 {
167 return CONFIG_SYS_I2C_SPEED;
168 }
170 /**
171 * i2c_set_bus_speed() - Configure I2C bus speed
172 * @speed: Newly set speed of the I2C bus in Hz
173 *
174 * This function is the default implementation of function for setting
175 * the I2C bus speed in Hz.
176 *
177 * A driver implementing runtime switching of I2C bus speed must override
178 * this function to report the speed correctly. Simple or legacy drivers
179 * can use this fallback.
180 *
181 * Returns zero on success, negative value on error.
182 */
183 __weak
184 int i2c_set_bus_speed(unsigned int speed)
185 {
186 if (speed != CONFIG_SYS_I2C_SPEED)
187 return -1;
189 return 0;
190 }
192 /**
193 * get_alen() - Small parser helper function to get address length
194 *
195 * Returns the address length.
196 */
197 static uint get_alen(char *arg)
198 {
199 int j;
200 int alen;
202 alen = 1;
203 for (j = 0; j < 8; j++) {
204 if (arg[j] == '.') {
205 alen = arg[j+1] - '0';
206 break;
207 } else if (arg[j] == '\0')
208 break;
209 }
210 return alen;
211 }
213 /**
214 * do_i2c_read() - Handle the "i2c read" command-line command
215 * @cmdtp: Command data struct pointer
216 * @flag: Command flag
217 * @argc: Command-line argument count
218 * @argv: Array of command-line arguments
219 *
220 * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
221 * on error.
222 *
223 * Syntax:
224 * i2c read {i2c_chip} {devaddr}{.0, .1, .2} {len} {memaddr}
225 */
226 static int do_i2c_read ( cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
227 {
228 u_char chip;
229 uint devaddr, alen, length;
230 u_char *memaddr;
232 if (argc != 5)
233 return CMD_RET_USAGE;
235 /*
236 * I2C chip address
237 */
238 chip = simple_strtoul(argv[1], NULL, 16);
240 /*
241 * I2C data address within the chip. This can be 1 or
242 * 2 bytes long. Some day it might be 3 bytes long :-).
243 */
244 devaddr = simple_strtoul(argv[2], NULL, 16);
245 alen = get_alen(argv[2]);
246 if (alen > 3)
247 return CMD_RET_USAGE;
249 /*
250 * Length is the number of objects, not number of bytes.
251 */
252 length = simple_strtoul(argv[3], NULL, 16);
254 /*
255 * memaddr is the address where to store things in memory
256 */
257 memaddr = (u_char *)simple_strtoul(argv[4], NULL, 16);
259 if (i2c_read(chip, devaddr, alen, memaddr, length) != 0) {
260 puts ("Error reading the chip.\n");
261 return 1;
262 }
263 return 0;
264 }
266 static int do_i2c_write(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
267 {
268 u_char chip;
269 uint devaddr, alen, length;
270 u_char *memaddr;
272 if (argc != 5)
273 return cmd_usage(cmdtp);
275 /*
276 * memaddr is the address where to store things in memory
277 */
278 memaddr = (u_char *)simple_strtoul(argv[1], NULL, 16);
280 /*
281 * I2C chip address
282 */
283 chip = simple_strtoul(argv[2], NULL, 16);
285 /*
286 * I2C data address within the chip. This can be 1 or
287 * 2 bytes long. Some day it might be 3 bytes long :-).
288 */
289 devaddr = simple_strtoul(argv[3], NULL, 16);
290 alen = get_alen(argv[3]);
291 if (alen > 3)
292 return cmd_usage(cmdtp);
294 /*
295 * Length is the number of objects, not number of bytes.
296 */
297 length = simple_strtoul(argv[4], NULL, 16);
299 while (length-- > 0) {
300 if (i2c_write(chip, devaddr++, alen, memaddr++, 1) != 0) {
301 puts("Error writing to the chip.\n");
302 return 1;
303 }
304 /*
305 * No write delay with FRAM devices.
306 */
307 #if !defined(CONFIG_SYS_I2C_FRAM)
308 udelay(11000);
309 #endif
310 }
311 return 0;
312 }
314 /**
315 * do_i2c_md() - Handle the "i2c md" command-line command
316 * @cmdtp: Command data struct pointer
317 * @flag: Command flag
318 * @argc: Command-line argument count
319 * @argv: Array of command-line arguments
320 *
321 * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
322 * on error.
323 *
324 * Syntax:
325 * i2c md {i2c_chip} {addr}{.0, .1, .2} {len}
326 */
327 static int do_i2c_md ( cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
328 {
329 u_char chip;
330 uint addr, alen, length;
331 int j, nbytes, linebytes;
333 /* We use the last specified parameters, unless new ones are
334 * entered.
335 */
336 chip = i2c_dp_last_chip;
337 addr = i2c_dp_last_addr;
338 alen = i2c_dp_last_alen;
339 length = i2c_dp_last_length;
341 if (argc < 3)
342 return CMD_RET_USAGE;
344 if ((flag & CMD_FLAG_REPEAT) == 0) {
345 /*
346 * New command specified.
347 */
349 /*
350 * I2C chip address
351 */
352 chip = simple_strtoul(argv[1], NULL, 16);
354 /*
355 * I2C data address within the chip. This can be 1 or
356 * 2 bytes long. Some day it might be 3 bytes long :-).
357 */
358 addr = simple_strtoul(argv[2], NULL, 16);
359 alen = get_alen(argv[2]);
360 if (alen > 3)
361 return CMD_RET_USAGE;
363 /*
364 * If another parameter, it is the length to display.
365 * Length is the number of objects, not number of bytes.
366 */
367 if (argc > 3)
368 length = simple_strtoul(argv[3], NULL, 16);
369 }
371 /*
372 * Print the lines.
373 *
374 * We buffer all read data, so we can make sure data is read only
375 * once.
376 */
377 nbytes = length;
378 do {
379 unsigned char linebuf[DISP_LINE_LEN];
380 unsigned char *cp;
382 linebytes = (nbytes > DISP_LINE_LEN) ? DISP_LINE_LEN : nbytes;
384 if (i2c_read(chip, addr, alen, linebuf, linebytes) != 0)
385 puts ("Error reading the chip.\n");
386 else {
387 printf("%04x:", addr);
388 cp = linebuf;
389 for (j=0; j<linebytes; j++) {
390 printf(" %02x", *cp++);
391 addr++;
392 }
393 puts (" ");
394 cp = linebuf;
395 for (j=0; j<linebytes; j++) {
396 if ((*cp < 0x20) || (*cp > 0x7e))
397 puts (".");
398 else
399 printf("%c", *cp);
400 cp++;
401 }
402 putc ('\n');
403 }
404 nbytes -= linebytes;
405 } while (nbytes > 0);
407 i2c_dp_last_chip = chip;
408 i2c_dp_last_addr = addr;
409 i2c_dp_last_alen = alen;
410 i2c_dp_last_length = length;
412 return 0;
413 }
415 /**
416 * do_i2c_mw() - Handle the "i2c mw" command-line command
417 * @cmdtp: Command data struct pointer
418 * @flag: Command flag
419 * @argc: Command-line argument count
420 * @argv: Array of command-line arguments
421 *
422 * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
423 * on error.
424 *
425 * Syntax:
426 * i2c mw {i2c_chip} {addr}{.0, .1, .2} {data} [{count}]
427 */
428 static int do_i2c_mw ( cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
429 {
430 uchar chip;
431 ulong addr;
432 uint alen;
433 uchar byte;
434 int count;
436 if ((argc < 4) || (argc > 5))
437 return CMD_RET_USAGE;
439 /*
440 * Chip is always specified.
441 */
442 chip = simple_strtoul(argv[1], NULL, 16);
444 /*
445 * Address is always specified.
446 */
447 addr = simple_strtoul(argv[2], NULL, 16);
448 alen = get_alen(argv[2]);
449 if (alen > 3)
450 return CMD_RET_USAGE;
452 /*
453 * Value to write is always specified.
454 */
455 byte = simple_strtoul(argv[3], NULL, 16);
457 /*
458 * Optional count
459 */
460 if (argc == 5)
461 count = simple_strtoul(argv[4], NULL, 16);
462 else
463 count = 1;
465 while (count-- > 0) {
466 if (i2c_write(chip, addr++, alen, &byte, 1) != 0)
467 puts ("Error writing the chip.\n");
468 /*
469 * Wait for the write to complete. The write can take
470 * up to 10mSec (we allow a little more time).
471 */
472 /*
473 * No write delay with FRAM devices.
474 */
475 #if !defined(CONFIG_SYS_I2C_FRAM)
476 udelay(11000);
477 #endif
478 }
480 return 0;
481 }
483 /**
484 * do_i2c_crc() - Handle the "i2c crc32" command-line command
485 * @cmdtp: Command data struct pointer
486 * @flag: Command flag
487 * @argc: Command-line argument count
488 * @argv: Array of command-line arguments
489 *
490 * Calculate a CRC on memory
491 *
492 * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
493 * on error.
494 *
495 * Syntax:
496 * i2c crc32 {i2c_chip} {addr}{.0, .1, .2} {count}
497 */
498 static int do_i2c_crc (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
499 {
500 uchar chip;
501 ulong addr;
502 uint alen;
503 int count;
504 uchar byte;
505 ulong crc;
506 ulong err;
508 if (argc < 4)
509 return CMD_RET_USAGE;
511 /*
512 * Chip is always specified.
513 */
514 chip = simple_strtoul(argv[1], NULL, 16);
516 /*
517 * Address is always specified.
518 */
519 addr = simple_strtoul(argv[2], NULL, 16);
520 alen = get_alen(argv[2]);
521 if (alen > 3)
522 return CMD_RET_USAGE;
524 /*
525 * Count is always specified
526 */
527 count = simple_strtoul(argv[3], NULL, 16);
529 printf ("CRC32 for %08lx ... %08lx ==> ", addr, addr + count - 1);
530 /*
531 * CRC a byte at a time. This is going to be slooow, but hey, the
532 * memories are small and slow too so hopefully nobody notices.
533 */
534 crc = 0;
535 err = 0;
536 while (count-- > 0) {
537 if (i2c_read(chip, addr, alen, &byte, 1) != 0)
538 err++;
539 crc = crc32 (crc, &byte, 1);
540 addr++;
541 }
542 if (err > 0)
543 puts ("Error reading the chip,\n");
544 else
545 printf ("%08lx\n", crc);
547 return 0;
548 }
550 /**
551 * mod_i2c_mem() - Handle the "i2c mm" and "i2c nm" command-line command
552 * @cmdtp: Command data struct pointer
553 * @flag: Command flag
554 * @argc: Command-line argument count
555 * @argv: Array of command-line arguments
556 *
557 * Modify memory.
558 *
559 * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
560 * on error.
561 *
562 * Syntax:
563 * i2c mm{.b, .w, .l} {i2c_chip} {addr}{.0, .1, .2}
564 * i2c nm{.b, .w, .l} {i2c_chip} {addr}{.0, .1, .2}
565 */
566 static int
567 mod_i2c_mem(cmd_tbl_t *cmdtp, int incrflag, int flag, int argc, char * const argv[])
568 {
569 uchar chip;
570 ulong addr;
571 uint alen;
572 ulong data;
573 int size = 1;
574 int nbytes;
576 if (argc != 3)
577 return CMD_RET_USAGE;
579 #ifdef CONFIG_BOOT_RETRY_TIME
580 reset_cmd_timeout(); /* got a good command to get here */
581 #endif
582 /*
583 * We use the last specified parameters, unless new ones are
584 * entered.
585 */
586 chip = i2c_mm_last_chip;
587 addr = i2c_mm_last_addr;
588 alen = i2c_mm_last_alen;
590 if ((flag & CMD_FLAG_REPEAT) == 0) {
591 /*
592 * New command specified. Check for a size specification.
593 * Defaults to byte if no or incorrect specification.
594 */
595 size = cmd_get_data_size(argv[0], 1);
597 /*
598 * Chip is always specified.
599 */
600 chip = simple_strtoul(argv[1], NULL, 16);
602 /*
603 * Address is always specified.
604 */
605 addr = simple_strtoul(argv[2], NULL, 16);
606 alen = get_alen(argv[2]);
607 if (alen > 3)
608 return CMD_RET_USAGE;
609 }
611 /*
612 * Print the address, followed by value. Then accept input for
613 * the next value. A non-converted value exits.
614 */
615 do {
616 printf("%08lx:", addr);
617 if (i2c_read(chip, addr, alen, (uchar *)&data, size) != 0)
618 puts ("\nError reading the chip,\n");
619 else {
620 data = cpu_to_be32(data);
621 if (size == 1)
622 printf(" %02lx", (data >> 24) & 0x000000FF);
623 else if (size == 2)
624 printf(" %04lx", (data >> 16) & 0x0000FFFF);
625 else
626 printf(" %08lx", data);
627 }
629 nbytes = readline (" ? ");
630 if (nbytes == 0) {
631 /*
632 * <CR> pressed as only input, don't modify current
633 * location and move to next.
634 */
635 if (incrflag)
636 addr += size;
637 nbytes = size;
638 #ifdef CONFIG_BOOT_RETRY_TIME
639 reset_cmd_timeout(); /* good enough to not time out */
640 #endif
641 }
642 #ifdef CONFIG_BOOT_RETRY_TIME
643 else if (nbytes == -2)
644 break; /* timed out, exit the command */
645 #endif
646 else {
647 char *endp;
649 data = simple_strtoul(console_buffer, &endp, 16);
650 if (size == 1)
651 data = data << 24;
652 else if (size == 2)
653 data = data << 16;
654 data = be32_to_cpu(data);
655 nbytes = endp - console_buffer;
656 if (nbytes) {
657 #ifdef CONFIG_BOOT_RETRY_TIME
658 /*
659 * good enough to not time out
660 */
661 reset_cmd_timeout();
662 #endif
663 if (i2c_write(chip, addr, alen, (uchar *)&data, size) != 0)
664 puts ("Error writing the chip.\n");
665 #ifdef CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS
666 udelay(CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS * 1000);
667 #endif
668 if (incrflag)
669 addr += size;
670 }
671 }
672 } while (nbytes);
674 i2c_mm_last_chip = chip;
675 i2c_mm_last_addr = addr;
676 i2c_mm_last_alen = alen;
678 return 0;
679 }
681 /**
682 * do_i2c_probe() - Handle the "i2c probe" command-line command
683 * @cmdtp: Command data struct pointer
684 * @flag: Command flag
685 * @argc: Command-line argument count
686 * @argv: Array of command-line arguments
687 *
688 * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
689 * on error.
690 *
691 * Syntax:
692 * i2c probe {addr}
693 *
694 * Returns zero (success) if one or more I2C devices was found
695 */
696 static int do_i2c_probe (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
697 {
698 int j;
699 int addr = -1;
700 int found = 0;
701 #if defined(CONFIG_SYS_I2C_NOPROBES)
702 int k, skip;
703 uchar bus = GET_BUS_NUM;
704 #endif /* NOPROBES */
706 if (argc == 2)
707 addr = simple_strtol(argv[1], 0, 16);
709 puts ("Valid chip addresses:");
710 for (j = 0; j < 128; j++) {
711 if ((0 <= addr) && (j != addr))
712 continue;
714 #if defined(CONFIG_SYS_I2C_NOPROBES)
715 skip = 0;
716 for (k=0; k < NUM_ELEMENTS_NOPROBE; k++) {
717 if (COMPARE_BUS(bus, k) && COMPARE_ADDR(j, k)) {
718 skip = 1;
719 break;
720 }
721 }
722 if (skip)
723 continue;
724 #endif
725 if (i2c_probe(j) == 0) {
726 printf(" %02X", j);
727 found++;
728 }
729 }
730 putc ('\n');
732 #if defined(CONFIG_SYS_I2C_NOPROBES)
733 puts ("Excluded chip addresses:");
734 for (k=0; k < NUM_ELEMENTS_NOPROBE; k++) {
735 if (COMPARE_BUS(bus,k))
736 printf(" %02X", NO_PROBE_ADDR(k));
737 }
738 putc ('\n');
739 #endif
741 return (0 == found);
742 }
744 /**
745 * do_i2c_loop() - Handle the "i2c loop" 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
750 *
751 * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
752 * on error.
753 *
754 * Syntax:
755 * i2c loop {i2c_chip} {addr}{.0, .1, .2} [{length}] [{delay}]
756 * {length} - Number of bytes to read
757 * {delay} - A DECIMAL number and defaults to 1000 uSec
758 */
759 static int do_i2c_loop(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
760 {
761 u_char chip;
762 ulong alen;
763 uint addr;
764 uint length;
765 u_char bytes[16];
766 int delay;
768 if (argc < 3)
769 return CMD_RET_USAGE;
771 /*
772 * Chip is always specified.
773 */
774 chip = simple_strtoul(argv[1], NULL, 16);
776 /*
777 * Address is always specified.
778 */
779 addr = simple_strtoul(argv[2], NULL, 16);
780 alen = get_alen(argv[2]);
781 if (alen > 3)
782 return CMD_RET_USAGE;
784 /*
785 * Length is the number of objects, not number of bytes.
786 */
787 length = 1;
788 length = simple_strtoul(argv[3], NULL, 16);
789 if (length > sizeof(bytes))
790 length = sizeof(bytes);
792 /*
793 * The delay time (uSec) is optional.
794 */
795 delay = 1000;
796 if (argc > 3)
797 delay = simple_strtoul(argv[4], NULL, 10);
798 /*
799 * Run the loop...
800 */
801 while (1) {
802 if (i2c_read(chip, addr, alen, bytes, length) != 0)
803 puts ("Error reading the chip.\n");
804 udelay(delay);
805 }
807 /* NOTREACHED */
808 return 0;
809 }
811 /*
812 * The SDRAM command is separately configured because many
813 * (most?) embedded boards don't use SDRAM DIMMs.
814 *
815 * FIXME: Document and probably move elsewhere!
816 */
817 #if defined(CONFIG_CMD_SDRAM)
818 static void print_ddr2_tcyc (u_char const b)
819 {
820 printf ("%d.", (b >> 4) & 0x0F);
821 switch (b & 0x0F) {
822 case 0x0:
823 case 0x1:
824 case 0x2:
825 case 0x3:
826 case 0x4:
827 case 0x5:
828 case 0x6:
829 case 0x7:
830 case 0x8:
831 case 0x9:
832 printf ("%d ns\n", b & 0x0F);
833 break;
834 case 0xA:
835 puts ("25 ns\n");
836 break;
837 case 0xB:
838 puts ("33 ns\n");
839 break;
840 case 0xC:
841 puts ("66 ns\n");
842 break;
843 case 0xD:
844 puts ("75 ns\n");
845 break;
846 default:
847 puts ("?? ns\n");
848 break;
849 }
850 }
852 static void decode_bits (u_char const b, char const *str[], int const do_once)
853 {
854 u_char mask;
856 for (mask = 0x80; mask != 0x00; mask >>= 1, ++str) {
857 if (b & mask) {
858 puts (*str);
859 if (do_once)
860 return;
861 }
862 }
863 }
865 /*
866 * Syntax:
867 * i2c sdram {i2c_chip}
868 */
869 static int do_sdram (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
870 {
871 enum { unknown, EDO, SDRAM, DDR2 } type;
873 u_char chip;
874 u_char data[128];
875 u_char cksum;
876 int j;
878 static const char *decode_CAS_DDR2[] = {
879 " TBD", " 6", " 5", " 4", " 3", " 2", " TBD", " TBD"
880 };
882 static const char *decode_CAS_default[] = {
883 " TBD", " 7", " 6", " 5", " 4", " 3", " 2", " 1"
884 };
886 static const char *decode_CS_WE_default[] = {
887 " TBD", " 6", " 5", " 4", " 3", " 2", " 1", " 0"
888 };
890 static const char *decode_byte21_default[] = {
891 " TBD (bit 7)\n",
892 " Redundant row address\n",
893 " Differential clock input\n",
894 " Registerd DQMB inputs\n",
895 " Buffered DQMB inputs\n",
896 " On-card PLL\n",
897 " Registered address/control lines\n",
898 " Buffered address/control lines\n"
899 };
901 static const char *decode_byte22_DDR2[] = {
902 " TBD (bit 7)\n",
903 " TBD (bit 6)\n",
904 " TBD (bit 5)\n",
905 " TBD (bit 4)\n",
906 " TBD (bit 3)\n",
907 " Supports partial array self refresh\n",
908 " Supports 50 ohm ODT\n",
909 " Supports weak driver\n"
910 };
912 static const char *decode_row_density_DDR2[] = {
913 "512 MiB", "256 MiB", "128 MiB", "16 GiB",
914 "8 GiB", "4 GiB", "2 GiB", "1 GiB"
915 };
917 static const char *decode_row_density_default[] = {
918 "512 MiB", "256 MiB", "128 MiB", "64 MiB",
919 "32 MiB", "16 MiB", "8 MiB", "4 MiB"
920 };
922 if (argc < 2)
923 return CMD_RET_USAGE;
925 /*
926 * Chip is always specified.
927 */
928 chip = simple_strtoul (argv[1], NULL, 16);
930 if (i2c_read (chip, 0, 1, data, sizeof (data)) != 0) {
931 puts ("No SDRAM Serial Presence Detect found.\n");
932 return 1;
933 }
935 cksum = 0;
936 for (j = 0; j < 63; j++) {
937 cksum += data[j];
938 }
939 if (cksum != data[63]) {
940 printf ("WARNING: Configuration data checksum failure:\n"
941 " is 0x%02x, calculated 0x%02x\n", data[63], cksum);
942 }
943 printf ("SPD data revision %d.%d\n",
944 (data[62] >> 4) & 0x0F, data[62] & 0x0F);
945 printf ("Bytes used 0x%02X\n", data[0]);
946 printf ("Serial memory size 0x%02X\n", 1 << data[1]);
948 puts ("Memory type ");
949 switch (data[2]) {
950 case 2:
951 type = EDO;
952 puts ("EDO\n");
953 break;
954 case 4:
955 type = SDRAM;
956 puts ("SDRAM\n");
957 break;
958 case 8:
959 type = DDR2;
960 puts ("DDR2\n");
961 break;
962 default:
963 type = unknown;
964 puts ("unknown\n");
965 break;
966 }
968 puts ("Row address bits ");
969 if ((data[3] & 0x00F0) == 0)
970 printf ("%d\n", data[3] & 0x0F);
971 else
972 printf ("%d/%d\n", data[3] & 0x0F, (data[3] >> 4) & 0x0F);
974 puts ("Column address bits ");
975 if ((data[4] & 0x00F0) == 0)
976 printf ("%d\n", data[4] & 0x0F);
977 else
978 printf ("%d/%d\n", data[4] & 0x0F, (data[4] >> 4) & 0x0F);
980 switch (type) {
981 case DDR2:
982 printf ("Number of ranks %d\n",
983 (data[5] & 0x07) + 1);
984 break;
985 default:
986 printf ("Module rows %d\n", data[5]);
987 break;
988 }
990 switch (type) {
991 case DDR2:
992 printf ("Module data width %d bits\n", data[6]);
993 break;
994 default:
995 printf ("Module data width %d bits\n",
996 (data[7] << 8) | data[6]);
997 break;
998 }
1000 puts ("Interface signal levels ");
1001 switch(data[8]) {
1002 case 0: puts ("TTL 5.0 V\n"); break;
1003 case 1: puts ("LVTTL\n"); break;
1004 case 2: puts ("HSTL 1.5 V\n"); break;
1005 case 3: puts ("SSTL 3.3 V\n"); break;
1006 case 4: puts ("SSTL 2.5 V\n"); break;
1007 case 5: puts ("SSTL 1.8 V\n"); break;
1008 default: puts ("unknown\n"); break;
1009 }
1011 switch (type) {
1012 case DDR2:
1013 printf ("SDRAM cycle time ");
1014 print_ddr2_tcyc (data[9]);
1015 break;
1016 default:
1017 printf ("SDRAM cycle time %d.%d ns\n",
1018 (data[9] >> 4) & 0x0F, data[9] & 0x0F);
1019 break;
1020 }
1022 switch (type) {
1023 case DDR2:
1024 printf ("SDRAM access time 0.%d%d ns\n",
1025 (data[10] >> 4) & 0x0F, data[10] & 0x0F);
1026 break;
1027 default:
1028 printf ("SDRAM access time %d.%d ns\n",
1029 (data[10] >> 4) & 0x0F, data[10] & 0x0F);
1030 break;
1031 }
1033 puts ("EDC configuration ");
1034 switch (data[11]) {
1035 case 0: puts ("None\n"); break;
1036 case 1: puts ("Parity\n"); break;
1037 case 2: puts ("ECC\n"); break;
1038 default: puts ("unknown\n"); break;
1039 }
1041 if ((data[12] & 0x80) == 0)
1042 puts ("No self refresh, rate ");
1043 else
1044 puts ("Self refresh, rate ");
1046 switch(data[12] & 0x7F) {
1047 case 0: puts ("15.625 us\n"); break;
1048 case 1: puts ("3.9 us\n"); break;
1049 case 2: puts ("7.8 us\n"); break;
1050 case 3: puts ("31.3 us\n"); break;
1051 case 4: puts ("62.5 us\n"); break;
1052 case 5: puts ("125 us\n"); break;
1053 default: puts ("unknown\n"); break;
1054 }
1056 switch (type) {
1057 case DDR2:
1058 printf ("SDRAM width (primary) %d\n", data[13]);
1059 break;
1060 default:
1061 printf ("SDRAM width (primary) %d\n", data[13] & 0x7F);
1062 if ((data[13] & 0x80) != 0) {
1063 printf (" (second bank) %d\n",
1064 2 * (data[13] & 0x7F));
1065 }
1066 break;
1067 }
1069 switch (type) {
1070 case DDR2:
1071 if (data[14] != 0)
1072 printf ("EDC width %d\n", data[14]);
1073 break;
1074 default:
1075 if (data[14] != 0) {
1076 printf ("EDC width %d\n",
1077 data[14] & 0x7F);
1079 if ((data[14] & 0x80) != 0) {
1080 printf (" (second bank) %d\n",
1081 2 * (data[14] & 0x7F));
1082 }
1083 }
1084 break;
1085 }
1087 if (DDR2 != type) {
1088 printf ("Min clock delay, back-to-back random column addresses "
1089 "%d\n", data[15]);
1090 }
1092 puts ("Burst length(s) ");
1093 if (data[16] & 0x80) puts (" Page");
1094 if (data[16] & 0x08) puts (" 8");
1095 if (data[16] & 0x04) puts (" 4");
1096 if (data[16] & 0x02) puts (" 2");
1097 if (data[16] & 0x01) puts (" 1");
1098 putc ('\n');
1099 printf ("Number of banks %d\n", data[17]);
1101 switch (type) {
1102 case DDR2:
1103 puts ("CAS latency(s) ");
1104 decode_bits (data[18], decode_CAS_DDR2, 0);
1105 putc ('\n');
1106 break;
1107 default:
1108 puts ("CAS latency(s) ");
1109 decode_bits (data[18], decode_CAS_default, 0);
1110 putc ('\n');
1111 break;
1112 }
1114 if (DDR2 != type) {
1115 puts ("CS latency(s) ");
1116 decode_bits (data[19], decode_CS_WE_default, 0);
1117 putc ('\n');
1118 }
1120 if (DDR2 != type) {
1121 puts ("WE latency(s) ");
1122 decode_bits (data[20], decode_CS_WE_default, 0);
1123 putc ('\n');
1124 }
1126 switch (type) {
1127 case DDR2:
1128 puts ("Module attributes:\n");
1129 if (data[21] & 0x80)
1130 puts (" TBD (bit 7)\n");
1131 if (data[21] & 0x40)
1132 puts (" Analysis probe installed\n");
1133 if (data[21] & 0x20)
1134 puts (" TBD (bit 5)\n");
1135 if (data[21] & 0x10)
1136 puts (" FET switch external enable\n");
1137 printf (" %d PLLs on DIMM\n", (data[21] >> 2) & 0x03);
1138 if (data[20] & 0x11) {
1139 printf (" %d active registers on DIMM\n",
1140 (data[21] & 0x03) + 1);
1141 }
1142 break;
1143 default:
1144 puts ("Module attributes:\n");
1145 if (!data[21])
1146 puts (" (none)\n");
1147 else
1148 decode_bits (data[21], decode_byte21_default, 0);
1149 break;
1150 }
1152 switch (type) {
1153 case DDR2:
1154 decode_bits (data[22], decode_byte22_DDR2, 0);
1155 break;
1156 default:
1157 puts ("Device attributes:\n");
1158 if (data[22] & 0x80) puts (" TBD (bit 7)\n");
1159 if (data[22] & 0x40) puts (" TBD (bit 6)\n");
1160 if (data[22] & 0x20) puts (" Upper Vcc tolerance 5%\n");
1161 else puts (" Upper Vcc tolerance 10%\n");
1162 if (data[22] & 0x10) puts (" Lower Vcc tolerance 5%\n");
1163 else puts (" Lower Vcc tolerance 10%\n");
1164 if (data[22] & 0x08) puts (" Supports write1/read burst\n");
1165 if (data[22] & 0x04) puts (" Supports precharge all\n");
1166 if (data[22] & 0x02) puts (" Supports auto precharge\n");
1167 if (data[22] & 0x01) puts (" Supports early RAS# precharge\n");
1168 break;
1169 }
1171 switch (type) {
1172 case DDR2:
1173 printf ("SDRAM cycle time (2nd highest CAS latency) ");
1174 print_ddr2_tcyc (data[23]);
1175 break;
1176 default:
1177 printf ("SDRAM cycle time (2nd highest CAS latency) %d."
1178 "%d ns\n", (data[23] >> 4) & 0x0F, data[23] & 0x0F);
1179 break;
1180 }
1182 switch (type) {
1183 case DDR2:
1184 printf ("SDRAM access from clock (2nd highest CAS latency) 0."
1185 "%d%d ns\n", (data[24] >> 4) & 0x0F, data[24] & 0x0F);
1186 break;
1187 default:
1188 printf ("SDRAM access from clock (2nd highest CAS latency) %d."
1189 "%d ns\n", (data[24] >> 4) & 0x0F, data[24] & 0x0F);
1190 break;
1191 }
1193 switch (type) {
1194 case DDR2:
1195 printf ("SDRAM cycle time (3rd highest CAS latency) ");
1196 print_ddr2_tcyc (data[25]);
1197 break;
1198 default:
1199 printf ("SDRAM cycle time (3rd highest CAS latency) %d."
1200 "%d ns\n", (data[25] >> 4) & 0x0F, data[25] & 0x0F);
1201 break;
1202 }
1204 switch (type) {
1205 case DDR2:
1206 printf ("SDRAM access from clock (3rd highest CAS latency) 0."
1207 "%d%d ns\n", (data[26] >> 4) & 0x0F, data[26] & 0x0F);
1208 break;
1209 default:
1210 printf ("SDRAM access from clock (3rd highest CAS latency) %d."
1211 "%d ns\n", (data[26] >> 4) & 0x0F, data[26] & 0x0F);
1212 break;
1213 }
1215 switch (type) {
1216 case DDR2:
1217 printf ("Minimum row precharge %d.%02d ns\n",
1218 (data[27] >> 2) & 0x3F, 25 * (data[27] & 0x03));
1219 break;
1220 default:
1221 printf ("Minimum row precharge %d ns\n", data[27]);
1222 break;
1223 }
1225 switch (type) {
1226 case DDR2:
1227 printf ("Row active to row active min %d.%02d ns\n",
1228 (data[28] >> 2) & 0x3F, 25 * (data[28] & 0x03));
1229 break;
1230 default:
1231 printf ("Row active to row active min %d ns\n", data[28]);
1232 break;
1233 }
1235 switch (type) {
1236 case DDR2:
1237 printf ("RAS to CAS delay min %d.%02d ns\n",
1238 (data[29] >> 2) & 0x3F, 25 * (data[29] & 0x03));
1239 break;
1240 default:
1241 printf ("RAS to CAS delay min %d ns\n", data[29]);
1242 break;
1243 }
1245 printf ("Minimum RAS pulse width %d ns\n", data[30]);
1247 switch (type) {
1248 case DDR2:
1249 puts ("Density of each row ");
1250 decode_bits (data[31], decode_row_density_DDR2, 1);
1251 putc ('\n');
1252 break;
1253 default:
1254 puts ("Density of each row ");
1255 decode_bits (data[31], decode_row_density_default, 1);
1256 putc ('\n');
1257 break;
1258 }
1260 switch (type) {
1261 case DDR2:
1262 puts ("Command and Address setup ");
1263 if (data[32] >= 0xA0) {
1264 printf ("1.%d%d ns\n",
1265 ((data[32] >> 4) & 0x0F) - 10, data[32] & 0x0F);
1266 } else {
1267 printf ("0.%d%d ns\n",
1268 ((data[32] >> 4) & 0x0F), data[32] & 0x0F);
1269 }
1270 break;
1271 default:
1272 printf ("Command and Address setup %c%d.%d ns\n",
1273 (data[32] & 0x80) ? '-' : '+',
1274 (data[32] >> 4) & 0x07, data[32] & 0x0F);
1275 break;
1276 }
1278 switch (type) {
1279 case DDR2:
1280 puts ("Command and Address hold ");
1281 if (data[33] >= 0xA0) {
1282 printf ("1.%d%d ns\n",
1283 ((data[33] >> 4) & 0x0F) - 10, data[33] & 0x0F);
1284 } else {
1285 printf ("0.%d%d ns\n",
1286 ((data[33] >> 4) & 0x0F), data[33] & 0x0F);
1287 }
1288 break;
1289 default:
1290 printf ("Command and Address hold %c%d.%d ns\n",
1291 (data[33] & 0x80) ? '-' : '+',
1292 (data[33] >> 4) & 0x07, data[33] & 0x0F);
1293 break;
1294 }
1296 switch (type) {
1297 case DDR2:
1298 printf ("Data signal input setup 0.%d%d ns\n",
1299 (data[34] >> 4) & 0x0F, data[34] & 0x0F);
1300 break;
1301 default:
1302 printf ("Data signal input setup %c%d.%d ns\n",
1303 (data[34] & 0x80) ? '-' : '+',
1304 (data[34] >> 4) & 0x07, data[34] & 0x0F);
1305 break;
1306 }
1308 switch (type) {
1309 case DDR2:
1310 printf ("Data signal input hold 0.%d%d ns\n",
1311 (data[35] >> 4) & 0x0F, data[35] & 0x0F);
1312 break;
1313 default:
1314 printf ("Data signal input hold %c%d.%d ns\n",
1315 (data[35] & 0x80) ? '-' : '+',
1316 (data[35] >> 4) & 0x07, data[35] & 0x0F);
1317 break;
1318 }
1320 puts ("Manufacturer's JEDEC ID ");
1321 for (j = 64; j <= 71; j++)
1322 printf ("%02X ", data[j]);
1323 putc ('\n');
1324 printf ("Manufacturing Location %02X\n", data[72]);
1325 puts ("Manufacturer's Part Number ");
1326 for (j = 73; j <= 90; j++)
1327 printf ("%02X ", data[j]);
1328 putc ('\n');
1329 printf ("Revision Code %02X %02X\n", data[91], data[92]);
1330 printf ("Manufacturing Date %02X %02X\n", data[93], data[94]);
1331 puts ("Assembly Serial Number ");
1332 for (j = 95; j <= 98; j++)
1333 printf ("%02X ", data[j]);
1334 putc ('\n');
1336 if (DDR2 != type) {
1337 printf ("Speed rating PC%d\n",
1338 data[126] == 0x66 ? 66 : data[126]);
1339 }
1340 return 0;
1341 }
1342 #endif
1344 /*
1345 * Syntax:
1346 * i2c edid {i2c_chip}
1347 */
1348 #if defined(CONFIG_I2C_EDID)
1349 int do_edid(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
1350 {
1351 u_char chip;
1352 struct edid1_info edid;
1354 if (argc < 2) {
1355 cmd_usage(cmdtp);
1356 return 1;
1357 }
1359 chip = simple_strtoul(argv[1], NULL, 16);
1360 if (i2c_read(chip, 0, 1, (uchar *)&edid, sizeof(edid)) != 0) {
1361 puts("Error reading EDID content.\n");
1362 return 1;
1363 }
1365 if (edid_check_info(&edid)) {
1366 puts("Content isn't valid EDID.\n");
1367 return 1;
1368 }
1370 edid_print_info(&edid);
1371 return 0;
1373 }
1374 #endif /* CONFIG_I2C_EDID */
1376 #if defined(CONFIG_I2C_MUX)
1377 /**
1378 * do_i2c_add_bus() - Handle the "i2c bus" command-line command
1379 * @cmdtp: Command data struct pointer
1380 * @flag: Command flag
1381 * @argc: Command-line argument count
1382 * @argv: Array of command-line arguments
1383 *
1384 * Returns zero always.
1385 */
1386 static int do_i2c_add_bus(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
1387 {
1388 int ret=0;
1390 if (argc == 1) {
1391 /* show all busses */
1392 I2C_MUX *mux;
1393 I2C_MUX_DEVICE *device = i2c_mux_devices;
1395 printf ("Busses reached over muxes:\n");
1396 while (device != NULL) {
1397 printf ("Bus ID: %x\n", device->busid);
1398 printf (" reached over Mux(es):\n");
1399 mux = device->mux;
1400 while (mux != NULL) {
1401 printf (" %s@%x ch: %x\n", mux->name, mux->chip, mux->channel);
1402 mux = mux->next;
1403 }
1404 device = device->next;
1405 }
1406 } else {
1407 (void)i2c_mux_ident_muxstring ((uchar *)argv[1]);
1408 ret = 0;
1409 }
1410 return ret;
1411 }
1412 #endif /* CONFIG_I2C_MUX */
1414 #if defined(CONFIG_I2C_MULTI_BUS)
1415 /**
1416 * do_i2c_bus_num() - Handle the "i2c dev" command-line command
1417 * @cmdtp: Command data struct pointer
1418 * @flag: Command flag
1419 * @argc: Command-line argument count
1420 * @argv: Array of command-line arguments
1421 *
1422 * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
1423 * on error.
1424 */
1425 static int do_i2c_bus_num(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
1426 {
1427 int bus_idx, ret=0;
1429 if (argc == 1)
1430 /* querying current setting */
1431 printf("Current bus is %d\n", i2c_get_bus_num());
1432 else {
1433 bus_idx = simple_strtoul(argv[1], NULL, 10);
1434 printf("Setting bus to %d\n", bus_idx);
1435 ret = i2c_set_bus_num(bus_idx);
1436 if (ret)
1437 printf("Failure changing bus number (%d)\n", ret);
1438 }
1439 return ret;
1440 }
1441 #endif /* CONFIG_I2C_MULTI_BUS */
1443 /**
1444 * do_i2c_bus_speed() - Handle the "i2c speed" command-line command
1445 * @cmdtp: Command data struct pointer
1446 * @flag: Command flag
1447 * @argc: Command-line argument count
1448 * @argv: Array of command-line arguments
1449 *
1450 * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
1451 * on error.
1452 */
1453 static int do_i2c_bus_speed(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
1454 {
1455 int speed, ret=0;
1457 if (argc == 1)
1458 /* querying current speed */
1459 printf("Current bus speed=%d\n", i2c_get_bus_speed());
1460 else {
1461 speed = simple_strtoul(argv[1], NULL, 10);
1462 printf("Setting bus speed to %d Hz\n", speed);
1463 ret = i2c_set_bus_speed(speed);
1464 if (ret)
1465 printf("Failure changing bus speed (%d)\n", ret);
1466 }
1467 return ret;
1468 }
1470 /**
1471 * do_i2c_mm() - Handle the "i2c mm" command-line command
1472 * @cmdtp: Command data struct pointer
1473 * @flag: Command flag
1474 * @argc: Command-line argument count
1475 * @argv: Array of command-line arguments
1476 *
1477 * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
1478 * on error.
1479 */
1480 static int do_i2c_mm(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
1481 {
1482 return mod_i2c_mem (cmdtp, 1, flag, argc, argv);
1483 }
1485 /**
1486 * do_i2c_nm() - Handle the "i2c nm" command-line command
1487 * @cmdtp: Command data struct pointer
1488 * @flag: Command flag
1489 * @argc: Command-line argument count
1490 * @argv: Array of command-line arguments
1491 *
1492 * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
1493 * on error.
1494 */
1495 static int do_i2c_nm(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
1496 {
1497 return mod_i2c_mem (cmdtp, 0, flag, argc, argv);
1498 }
1500 /**
1501 * do_i2c_reset() - Handle the "i2c reset" command-line command
1502 * @cmdtp: Command data struct pointer
1503 * @flag: Command flag
1504 * @argc: Command-line argument count
1505 * @argv: Array of command-line arguments
1506 *
1507 * Returns zero always.
1508 */
1509 static int do_i2c_reset(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
1510 {
1511 i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
1512 return 0;
1513 }
1515 static cmd_tbl_t cmd_i2c_sub[] = {
1516 #if defined(CONFIG_I2C_MUX)
1517 U_BOOT_CMD_MKENT(bus, 1, 1, do_i2c_add_bus, "", ""),
1518 #endif /* CONFIG_I2C_MUX */
1519 U_BOOT_CMD_MKENT(crc32, 3, 1, do_i2c_crc, "", ""),
1520 #if defined(CONFIG_I2C_MULTI_BUS)
1521 U_BOOT_CMD_MKENT(dev, 1, 1, do_i2c_bus_num, "", ""),
1522 #endif /* CONFIG_I2C_MULTI_BUS */
1523 #if defined(CONFIG_I2C_EDID)
1524 U_BOOT_CMD_MKENT(edid, 1, 1, do_edid, "", ""),
1525 #endif /* CONFIG_I2C_EDID */
1526 U_BOOT_CMD_MKENT(loop, 3, 1, do_i2c_loop, "", ""),
1527 U_BOOT_CMD_MKENT(md, 3, 1, do_i2c_md, "", ""),
1528 U_BOOT_CMD_MKENT(mm, 2, 1, do_i2c_mm, "", ""),
1529 U_BOOT_CMD_MKENT(mw, 3, 1, do_i2c_mw, "", ""),
1530 U_BOOT_CMD_MKENT(nm, 2, 1, do_i2c_nm, "", ""),
1531 U_BOOT_CMD_MKENT(probe, 0, 1, do_i2c_probe, "", ""),
1532 U_BOOT_CMD_MKENT(read, 5, 1, do_i2c_read, "", ""),
1533 U_BOOT_CMD_MKENT(write, 5, 0, do_i2c_write, "", ""),
1534 U_BOOT_CMD_MKENT(reset, 0, 1, do_i2c_reset, "", ""),
1535 #if defined(CONFIG_CMD_SDRAM)
1536 U_BOOT_CMD_MKENT(sdram, 1, 1, do_sdram, "", ""),
1537 #endif
1538 U_BOOT_CMD_MKENT(speed, 1, 1, do_i2c_bus_speed, "", ""),
1539 };
1541 #ifdef CONFIG_NEEDS_MANUAL_RELOC
1542 void i2c_reloc(void) {
1543 fixup_cmdtable(cmd_i2c_sub, ARRAY_SIZE(cmd_i2c_sub));
1544 }
1545 #endif
1547 /**
1548 * do_i2c() - Handle the "i2c" command-line command
1549 * @cmdtp: Command data struct pointer
1550 * @flag: Command flag
1551 * @argc: Command-line argument count
1552 * @argv: Array of command-line arguments
1553 *
1554 * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
1555 * on error.
1556 */
1557 static int do_i2c(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
1558 {
1559 cmd_tbl_t *c;
1561 if (argc < 2)
1562 return CMD_RET_USAGE;
1564 /* Strip off leading 'i2c' command argument */
1565 argc--;
1566 argv++;
1568 c = find_cmd_tbl(argv[0], &cmd_i2c_sub[0], ARRAY_SIZE(cmd_i2c_sub));
1570 if (c)
1571 return c->cmd(cmdtp, flag, argc, argv);
1572 else
1573 return CMD_RET_USAGE;
1574 }
1576 /***************************************************/
1577 #ifdef CONFIG_SYS_LONGHELP
1578 static char i2c_help_text[] =
1579 #if defined(CONFIG_I2C_MUX)
1580 "bus [muxtype:muxaddr:muxchannel] - add a new bus reached over muxes\ni2c "
1581 #endif /* CONFIG_I2C_MUX */
1582 "crc32 chip address[.0, .1, .2] count - compute CRC32 checksum\n"
1583 #if defined(CONFIG_I2C_MULTI_BUS)
1584 "i2c dev [dev] - show or set current I2C bus\n"
1585 #endif /* CONFIG_I2C_MULTI_BUS */
1586 #if defined(CONFIG_I2C_EDID)
1587 "i2c edid chip - print EDID configuration information\n"
1588 #endif /* CONFIG_I2C_EDID */
1589 "i2c loop chip address[.0, .1, .2] [# of objects] - looping read of device\n"
1590 "i2c md chip address[.0, .1, .2] [# of objects] - read from I2C device\n"
1591 "i2c mm chip address[.0, .1, .2] - write to I2C device (auto-incrementing)\n"
1592 "i2c mw chip address[.0, .1, .2] value [count] - write to I2C device (fill)\n"
1593 "i2c nm chip address[.0, .1, .2] - write to I2C device (constant address)\n"
1594 "i2c probe [address] - test for and show device(s) on the I2C bus\n"
1595 "i2c read chip address[.0, .1, .2] length memaddress - read to memory \n"
1596 "i2c write memaddress chip address[.0, .1, .2] length - write memory to i2c\n"
1597 "i2c reset - re-init the I2C Controller\n"
1598 #if defined(CONFIG_CMD_SDRAM)
1599 "i2c sdram chip - print SDRAM configuration information\n"
1600 #endif
1601 "i2c speed [speed] - show or set I2C bus speed";
1602 #endif
1604 U_BOOT_CMD(
1605 i2c, 6, 1, do_i2c,
1606 "I2C sub-system",
1607 i2c_help_text
1608 );
1610 #if defined(CONFIG_I2C_MUX)
1611 static int i2c_mux_add_device(I2C_MUX_DEVICE *dev)
1612 {
1613 I2C_MUX_DEVICE *devtmp = i2c_mux_devices;
1615 if (i2c_mux_devices == NULL) {
1616 i2c_mux_devices = dev;
1617 return 0;
1618 }
1619 while (devtmp->next != NULL)
1620 devtmp = devtmp->next;
1622 devtmp->next = dev;
1623 return 0;
1624 }
1626 I2C_MUX_DEVICE *i2c_mux_search_device(int id)
1627 {
1628 I2C_MUX_DEVICE *device = i2c_mux_devices;
1630 while (device != NULL) {
1631 if (device->busid == id)
1632 return device;
1633 device = device->next;
1634 }
1635 return NULL;
1636 }
1638 /* searches in the buf from *pos the next ':'.
1639 * returns:
1640 * 0 if found (with *pos = where)
1641 * < 0 if an error occured
1642 * > 0 if the end of buf is reached
1643 */
1644 static int i2c_mux_search_next (int *pos, uchar *buf, int len)
1645 {
1646 while ((buf[*pos] != ':') && (*pos < len)) {
1647 *pos += 1;
1648 }
1649 if (*pos >= len)
1650 return 1;
1651 if (buf[*pos] != ':')
1652 return -1;
1653 return 0;
1654 }
1656 static int i2c_mux_get_busid (void)
1657 {
1658 int tmp = i2c_mux_busid;
1660 i2c_mux_busid ++;
1661 return tmp;
1662 }
1664 /* Analyses a Muxstring and immediately sends the
1665 commands to the muxes. Runs from flash.
1666 */
1667 int i2c_mux_ident_muxstring_f (uchar *buf)
1668 {
1669 int pos = 0;
1670 int oldpos;
1671 int ret = 0;
1672 int len = strlen((char *)buf);
1673 int chip;
1674 uchar channel;
1675 int was = 0;
1677 while (ret == 0) {
1678 oldpos = pos;
1679 /* search name */
1680 ret = i2c_mux_search_next(&pos, buf, len);
1681 if (ret != 0)
1682 printf ("ERROR\n");
1683 /* search address */
1684 pos ++;
1685 oldpos = pos;
1686 ret = i2c_mux_search_next(&pos, buf, len);
1687 if (ret != 0)
1688 printf ("ERROR\n");
1689 buf[pos] = 0;
1690 chip = simple_strtoul((char *)&buf[oldpos], NULL, 16);
1691 buf[pos] = ':';
1692 /* search channel */
1693 pos ++;
1694 oldpos = pos;
1695 ret = i2c_mux_search_next(&pos, buf, len);
1696 if (ret < 0)
1697 printf ("ERROR\n");
1698 was = 0;
1699 if (buf[pos] != 0) {
1700 buf[pos] = 0;
1701 was = 1;
1702 }
1703 channel = simple_strtoul((char *)&buf[oldpos], NULL, 16);
1704 if (was)
1705 buf[pos] = ':';
1706 if (i2c_write(chip, 0, 0, &channel, 1) != 0) {
1707 printf ("Error setting Mux: chip:%x channel: \
1708 %x\n", chip, channel);
1709 return -1;
1710 }
1711 pos ++;
1712 oldpos = pos;
1714 }
1715 i2c_init_board();
1717 return 0;
1718 }
1720 /* Analyses a Muxstring and if this String is correct
1721 * adds a new I2C Bus.
1722 */
1723 I2C_MUX_DEVICE *i2c_mux_ident_muxstring (uchar *buf)
1724 {
1725 I2C_MUX_DEVICE *device;
1726 I2C_MUX *mux;
1727 int pos = 0;
1728 int oldpos;
1729 int ret = 0;
1730 int len = strlen((char *)buf);
1731 int was = 0;
1733 device = (I2C_MUX_DEVICE *)malloc (sizeof(I2C_MUX_DEVICE));
1734 device->mux = NULL;
1735 device->busid = i2c_mux_get_busid ();
1736 device->next = NULL;
1737 while (ret == 0) {
1738 mux = (I2C_MUX *)malloc (sizeof(I2C_MUX));
1739 mux->next = NULL;
1740 /* search name of mux */
1741 oldpos = pos;
1742 ret = i2c_mux_search_next(&pos, buf, len);
1743 if (ret != 0)
1744 printf ("%s no name.\n", __FUNCTION__);
1745 mux->name = (char *)malloc (pos - oldpos + 1);
1746 memcpy (mux->name, &buf[oldpos], pos - oldpos);
1747 mux->name[pos - oldpos] = 0;
1748 /* search address */
1749 pos ++;
1750 oldpos = pos;
1751 ret = i2c_mux_search_next(&pos, buf, len);
1752 if (ret != 0)
1753 printf ("%s no mux address.\n", __FUNCTION__);
1754 buf[pos] = 0;
1755 mux->chip = simple_strtoul((char *)&buf[oldpos], NULL, 16);
1756 buf[pos] = ':';
1757 /* search channel */
1758 pos ++;
1759 oldpos = pos;
1760 ret = i2c_mux_search_next(&pos, buf, len);
1761 if (ret < 0)
1762 printf ("%s no mux channel.\n", __FUNCTION__);
1763 was = 0;
1764 if (buf[pos] != 0) {
1765 buf[pos] = 0;
1766 was = 1;
1767 }
1768 mux->channel = simple_strtoul((char *)&buf[oldpos], NULL, 16);
1769 if (was)
1770 buf[pos] = ':';
1771 if (device->mux == NULL)
1772 device->mux = mux;
1773 else {
1774 I2C_MUX *muxtmp = device->mux;
1775 while (muxtmp->next != NULL) {
1776 muxtmp = muxtmp->next;
1777 }
1778 muxtmp->next = mux;
1779 }
1780 pos ++;
1781 oldpos = pos;
1782 }
1783 if (ret > 0) {
1784 /* Add Device */
1785 i2c_mux_add_device (device);
1786 return device;
1787 }
1789 return NULL;
1790 }
1792 int i2x_mux_select_mux(int bus)
1793 {
1794 I2C_MUX_DEVICE *dev;
1795 I2C_MUX *mux;
1797 if ((gd->flags & GD_FLG_RELOC) != GD_FLG_RELOC) {
1798 /* select Default Mux Bus */
1799 #if defined(CONFIG_SYS_I2C_IVM_BUS)
1800 i2c_mux_ident_muxstring_f ((uchar *)CONFIG_SYS_I2C_IVM_BUS);
1801 #else
1802 {
1803 unsigned char *buf;
1804 buf = (unsigned char *) getenv("EEprom_ivm");
1805 if (buf != NULL)
1806 i2c_mux_ident_muxstring_f (buf);
1807 }
1808 #endif
1809 return 0;
1810 }
1811 dev = i2c_mux_search_device(bus);
1812 if (dev == NULL)
1813 return -1;
1815 mux = dev->mux;
1816 while (mux != NULL) {
1817 /* do deblocking on each level of mux, before mux config */
1818 i2c_init_board();
1819 if (i2c_write(mux->chip, 0, 0, &mux->channel, 1) != 0) {
1820 printf ("Error setting Mux: chip:%x channel: \
1821 %x\n", mux->chip, mux->channel);
1822 return -1;
1823 }
1824 mux = mux->next;
1825 }
1826 /* do deblocking on each level of mux and after mux config */
1827 i2c_init_board();
1828 return 0;
1829 }
1830 #endif /* CONFIG_I2C_MUX */