summaryrefslogtreecommitdiffstats
path: root/board/xilinx/xilinx_iic/iic_adapter.c
blob: f3ecba72dc88095ba9837f7fe01e14544cc6efdf (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
/******************************************************************************
*
*     Author: Xilinx, Inc.
*
*
*     This program is free software; you can redistribute it and/or modify it
*     under the terms of the GNU General Public License as published by the
*     Free Software Foundation; either version 2 of the License, or (at your
*     option) any later version.
*
*
*     XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION "AS IS" AS A
*     COURTESY TO YOU. BY PROVIDING THIS DESIGN, CODE, OR INFORMATION AS
*     ONE POSSIBLE IMPLEMENTATION OF THIS FEATURE, APPLICATION OR STANDARD,
*     XILINX IS MAKING NO REPRESENTATION THAT THIS IMPLEMENTATION IS FREE
*     FROM ANY CLAIMS OF INFRINGEMENT, AND YOU ARE RESPONSIBLE FOR OBTAINING
*     ANY THIRD PARTY RIGHTS YOU MAY REQUIRE FOR YOUR IMPLEMENTATION.
*     XILINX EXPRESSLY DISCLAIMS ANY WARRANTY WHATSOEVER WITH RESPECT TO
*     THE ADEQUACY OF THE IMPLEMENTATION, INCLUDING BUT NOT LIMITED TO ANY
*     WARRANTIES OR REPRESENTATIONS THAT THIS IMPLEMENTATION IS FREE FROM
*     CLAIMS OF INFRINGEMENT, IMPLIED WARRANTIES OF MERCHANTABILITY AND
*     FITNESS FOR A PARTICULAR PURPOSE.
*
*
*     Xilinx hardware products are not intended for use in life support
*     appliances, devices, or systems. Use in such applications is
*     expressly prohibited.
*
*
*     (c) Copyright 2002-2004 Xilinx Inc.
*     All rights reserved.
*
*
*     You should have received a copy of the GNU General Public License along
*     with this program; if not, write to the Free Software Foundation, Inc.,
*     675 Mass Ave, Cambridge, MA 02139, USA.
*
******************************************************************************/

#include <common.h>
#include <environment.h>
#include <net.h>
#include <configs/ml300.h>
#include "xparameters.h"

#ifdef CFG_ENV_IS_IN_EEPROM
#include <i2c.h>
#include "xiic_l.h"

#define IIC_DELAY     5000

static u8 envStep = 0;		/* 0 means crc has not been read */
const u8 hex[] = "0123456789ABCDEF"; /* lookup table for ML300 CRC */

/************************************************************************
 * Use Xilinx provided driver to send data to EEPROM using iic bus.
 */
static void
send(u32 adr, u8 * data, u32 len)
{
	u8 sendBuf[34];		/* first 2-bit is address and others are data */
	u32 pos, wlen;
	u32 ret;

	wlen = 32;
	for (pos = 0; pos < len; pos += 32) {
		if ((len - pos) < 32)
			wlen = len - pos;

		/* Put address and data bits together */
		sendBuf[0] = (u8) ((adr + pos) >> 8);
		sendBuf[1] = (u8) (adr + pos);
		memcpy(&sendBuf[2], &data[pos], wlen);

		/* Send to EEPROM through iic bus */
		ret = XIic_Send(XPAR_IIC_0_BASEADDR, CFG_I2C_EEPROM_ADDR >> 1,
				sendBuf, wlen + 2);

		udelay(IIC_DELAY);
	}
}

/************************************************************************
 * Use Xilinx provided driver to read data from EEPROM using the iic bus.
 */
static void
receive(u32 adr, u8 * data, u32 len)
{
	u8 address[2];
	u32 ret;

	address[0] = (u8) (adr >> 8);
	address[1] = (u8) adr;

	/* Provide EEPROM address */
	ret =
	    XIic_Send(XPAR_IIC_0_BASEADDR, CFG_I2C_EEPROM_ADDR >> 1, address,
		      2);
	/* Receive data from EEPROM */
	ret =
	    XIic_Recv(XPAR_IIC_0_BASEADDR, CFG_I2C_EEPROM_ADDR >> 1, data, len);
}

/************************************************************************
 * Convert a hexadecimal string to its equivalent integer value.
 */
static u8
axtoi(u8 * hexStg)
{
	u8 n;			/* position in string */
	u8 m;			/* position in digit[] to shift */
	u8 count;		/* loop index */
	u8 intValue;		/* integer value of hex string */
	u8 digit[2];		/* hold values to convert */

	for (n = 0; n < 2; n++) {
		if (hexStg[n] == '\0')
			break;
		if (hexStg[n] > 0x29 && hexStg[n] < 0x40)
			digit[n] = hexStg[n] & 0x0f;
		else if (hexStg[n] >= 'a' && hexStg[n] <= 'f')
			digit[n] = (hexStg[n] & 0x0f) + 9;
		else if (hexStg[n] >= 'A' && hexStg[n] <= 'F')
			digit[n] = (hexStg[n] & 0x0f) + 9;
		else
			break;
	}

	intValue = 0;
	count = n;
	m = n - 1;
	n = 0;
	while (n < count) {
		intValue = intValue | (digit[n] << (m << 2));
		m--;		/* adjust the position to set */
		n++;		/* next digit to process */
	}

	return (intValue);
}

/************************************************************************
 * Convert an integer string to its equivalent value.
 */
static u8
atoi(uchar * string)
{
	u8 res = 0;
	while (*string >= '0' && *string <= '9') {
		res *= 10;
		res += *string - '0';
		string++;
	}

	return res;
}

/************************************************************************
 * Key-value pairs are separated by "=" sign.
 */
static void
findKey(uchar * buffer, int *loc, u8 len)
{
	u32 i;

	for (i = 0; i < len; i++)
		if (buffer[i] == '=') {
			*loc = i;
			return;
		}

	/* return -1 is no "=" sign found */
	*loc = -1;
}

/************************************************************************
 * Compute a new ML300 CRC when user calls the saveenv command.
 * Also update EEPROM with new CRC value.
 */
static u8
update_crc(u32 len, uchar * data)
{
	uchar temp[6] = { 'C', '=', 0x00, 0x00, 0x00, 0x00 };
	u32 crc;		/* new crc value */
	u32 i;

	crc = 0;

	/* calculate new CRC */
	for (i = 0; i < len; i++)
		crc += data[i];

	/* CRC includes key for check sum */
	crc += 'C' + '=';

	/* compose new CRC to be updated */
	temp[2] = hex[(crc >> 4) & 0xf];
	temp[3] = hex[crc & 0xf];

	/* check to see if env size exceeded */
	if (len + 6 > ENV_SIZE) {
		printf("ERROR: not enough space to store CRC on EEPROM");
		return 1;
	}

	memcpy(data + len, temp, 6);
	return 0;
}

/************************************************************************
 * Read out ML300 CRC and compare it with a runtime calculated ML300 CRC.
 * If equal, then pass back a u-boot CRC value, otherwise pass back
 * junk to indicate CRC error.
*/
static void
read_crc(uchar * buffer, int len)
{
	u32 addr, n;
	u32 crc;		/* runtime crc */
	u8 old[2] = { 0xff, 0xff };	/* current CRC in EEPROM */
	u8 stop;		/* indication of end of env data */
	u8 pre;			/* previous EEPROM data bit */
	int i, loc;

	addr = CFG_ENV_OFFSET;	/* start from first env address */
	n = 0;
	pre = 1;
	stop = 1;
	crc = 0;

	/* calculate runtime CRC according to ML300 and read back
	   old CRC stored in the EEPROM */
	while (n < CFG_ENV_SIZE) {
		receive(addr, buffer, len);

		/* found two null chars, end of env */
		if ((pre || buffer[0]) == 0)
			break;

		findKey(buffer, &loc, len);

		/* found old check sum, read and store old CRC */
		if ((loc == 0 && pre == 'C')
		    || (loc > 0 && buffer[loc - 1] == 'C'))
			receive(addr + loc + 1, old, 2);

		pre = buffer[len - 1];

		/* calculate runtime ML300 CRC */
		crc += buffer[0];
		i = 1;
		do {
			crc += buffer[i];
			stop = buffer[i] || buffer[i - 1];
			i++;
		} while (stop && (i < len));

		if (stop == 0)
			break;

		n += len;
		addr += len;
	}

	/* exclude old CRC from runtime calculation */
	crc -= (old[0] + old[1]);

	/* match CRC values, send back u-boot CRC */
	if ((old[0] == hex[(crc >> 4) & 0xf])
	    && (old[1] == hex[crc & 0xf])) {
		crc = 0;
		n = 0;
		addr =
		    CFG_ENV_OFFSET - offsetof(env_t, crc) + offsetof(env_t,
								     data);
		/* calculate u-boot crc */
		while (n < ENV_SIZE) {
			receive(addr, buffer, len);
			crc = crc32(crc, buffer, len);
			n += len;
			addr += len;
		}

		memcpy(buffer, &crc, 4);
	}
}

/************************************************************************
 * Convert IP address to hexadecimals.
 */
static void
ip_ml300(uchar * s, uchar * res)
{
	char temp[2];
	u8 i;

	res[0] = 0x00;

	for (i = 0; i < 4; i++) {
		sprintf(temp, "%02x", atoi(s));
		s = (uchar *)strchr((char *)s, '.') + 1;
		strcat((char *)res, temp);
	}
}

/************************************************************************
 * Change 0xff (255), a dummy null char to 0x00.
 */
static void
change_null(uchar * s)
{
	if (s != NULL) {
		change_null((uchar *)strchr((char *)s + 1, 255));
		*(strchr((char *)s, 255)) = '\0';
	}
}

/************************************************************************
 * Update environment variable name and values to u-boot standard.
 */
void
convert_env(void)
{
	char *s;		/* pointer to env value */
	char temp[20];		/* temp storage for addresses */

	/* E -> ethaddr */
	s = getenv("E");
	if (s != NULL) {
		sprintf(temp, "%c%c.%c%c.%c%c.%c%c.%c%c.%c%c",
			s[0], s[1],  s[ 2], s[ 3],
			s[4], s[5],  s[ 6], s[ 7],
			s[8], s[9],  s[10], s[11] );
		setenv("ethaddr", temp);
		setenv("E", NULL);
	}

	/* L -> serial# */
	s = getenv("L");
	if (s != NULL) {
		setenv("serial#", s);
		setenv("L", NULL);
	}

	/* I -> ipaddr */
	s = getenv("I");
	if (s != NULL) {
		sprintf(temp, "%d.%d.%d.%d", axtoi((u8 *)s), axtoi((u8 *)(s + 2)),
			axtoi((u8 *)(s + 4)), axtoi((u8 *)(s + 6)));
		setenv("ipaddr", temp);
		setenv("I", NULL);
	}

	/* S -> serverip */
	s = getenv("S");
	if (s != NULL) {
		sprintf(temp, "%d.%d.%d.%d", axtoi((u8 *)s), axtoi((u8 *)(s + 2)),
			axtoi((u8 *)(s + 4)), axtoi((u8 *)(s + 6)));
		setenv("serverip", temp);
		setenv("S", NULL);
	}

	/* A -> bootargs */
	s = getenv("A");
	if (s != NULL) {
		setenv("bootargs", s);
		setenv("A", NULL);
	}

	/* F -> bootfile */
	s = getenv("F");
	if (s != NULL) {
		setenv("bootfile", s);
		setenv("F", NULL);
	}

	/* M -> bootcmd */
	s = getenv("M");
	if (s != NULL) {
		setenv("bootcmd", s);
		setenv("M", NULL);
	}

	/* Don't include C (CRC) */
	setenv("C", NULL);
}

/************************************************************************
 * Save user modified environment values back to EEPROM.
 */
static void
save_env(void)
{
	char eprom[ENV_SIZE];	/* buffer to be written back to EEPROM */
	char *s, temp[20];
	char ff[] = { 0xff, 0x00 };	/* dummy null value */
	u32 len;		/* length of env to be written to EEPROM */

	eprom[0] = 0x00;

	/* ethaddr -> E */
	s = getenv("ethaddr");
	if (s != NULL) {
		strcat(eprom, "E=");
		sprintf(temp, "%c%c%c%c%c%c%c%c%c%c%c%c",
			*s, *(s + 1), *(s + 3), *(s + 4), *(s + 6), *(s + 7),
			*(s + 9), *(s + 10), *(s + 12), *(s + 13), *(s + 15),
			*(s + 16));
		strcat(eprom, temp);
		strcat(eprom, ff);
	}

	/* serial# -> L */
	s = getenv("serial#");
	if (s != NULL) {
		strcat(eprom, "L=");
		strcat(eprom, s);
		strcat(eprom, ff);
	}

	/* ipaddr -> I */
	s = getenv("ipaddr");
	if (s != NULL) {
		strcat(eprom, "I=");
		ip_ml300((uchar *)s, (uchar *)temp);
		strcat(eprom, temp);
		strcat(eprom, ff);
	}

	/* serverip -> S */
	s = getenv("serverip");
	if (s != NULL) {
		strcat(eprom, "S=");
		ip_ml300((uchar *)s, (uchar *)temp);
		strcat(eprom, temp);
		strcat(eprom, ff);
	}

	/* bootargs -> A */
	s = getenv("bootargs");
	if (s != NULL) {
		strcat(eprom, "A=");
		strcat(eprom, s);
		strcat(eprom, ff);
	}

	/* bootfile -> F */
	s = getenv("bootfile");
	if (s != NULL) {
		strcat(eprom, "F=");
		strcat(eprom, s);
		strcat(eprom, ff);
	}

	/* bootcmd -> M */
	s = getenv("bootcmd");
	if (s != NULL) {
		strcat(eprom, "M=");
		strcat(eprom, s);
		strcat(eprom, ff);
	}

	len = strlen(eprom);	/* find env length without crc */
	change_null((uchar *)eprom);	/* change 0xff to 0x00 */

	/* update EEPROM env values if there is enough space */
	if (update_crc(len, (uchar *)eprom) == 0)
		send(CFG_ENV_OFFSET, (uchar *)eprom, len + 6);
}

/************************************************************************
 * U-boot call for EEPROM read associated activities.
 */
int
i2c_read(uchar chip, uint addr, int alen, uchar * buffer, int len)
{

	if (envStep == 0) {
		/* first read call is for crc */
		read_crc(buffer, len);
		++envStep;
		return 0;
	} else if (envStep == 1) {
		/* then read out EEPROM content for runtime u-boot CRC calculation */
		receive(addr, buffer, len);

		if (addr + len - CFG_ENV_OFFSET == CFG_ENV_SIZE)
			/* end of runtime crc read */
			++envStep;
		return 0;
	}

	if (len < 2) {
		/* when call getenv_r */
		receive(addr, buffer, len);
	} else if (addr + len < CFG_ENV_OFFSET + CFG_ENV_SIZE) {
		/* calling env_relocate(), but don't read out
		   crc value from EEPROM */
		receive(addr, buffer + 4, len);
	} else {
		receive(addr, buffer + 4, len - 4);
	}

	return 0;

}

/************************************************************************
 * U-boot call for EEPROM write acativities.
 */
int
i2c_write(uchar chip, uint addr, int alen, uchar * buffer, int len)
{
	/* save env on last page write called by u-boot */
	if (addr + len >= CFG_ENV_OFFSET + CFG_ENV_SIZE)
		save_env();

	return 0;
}

/************************************************************************
 * Dummy function.
 */
int
i2c_probe(uchar chip)
{
	return 1;
}

#endif
OpenPOWER on IntegriCloud