summaryrefslogtreecommitdiff
path: root/board/freescale/common/sys_eeprom.c
blob: 3ecfb06cc84d5a7a85973f03a7c256b2362d0740 (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
/*
 * Copyright 2006, 2008-2009 Freescale Semiconductor
 * York Sun (yorksun@freescale.com)
 * Haiying Wang (haiying.wang@freescale.com)
 * Timur Tabi (timur@freescale.com)
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * 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., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <common.h>
#include <command.h>
#include <i2c.h>
#include <linux/ctype.h>

#ifdef CONFIG_SYS_I2C_EEPROM_CCID
#include "../common/eeprom.h"
#define MAX_NUM_PORTS	8
#endif

#ifdef CONFIG_SYS_I2C_EEPROM_NXID
#define MAX_NUM_PORTS	8
#define NXID_VERSION	0
#endif

#ifdef CONFIG_SYS_I2C_EEPROM_NXID_1
#define CONFIG_SYS_I2C_EEPROM_NXID
#define MAX_NUM_PORTS	23
#define NXID_VERSION	1
#endif

/**
 * static eeprom: EEPROM layout for CCID or NXID formats
 *
 * See application note AN3638 for details.
 */
static struct __attribute__ ((__packed__)) eeprom {
#ifdef CONFIG_SYS_I2C_EEPROM_CCID
	u8 id[4];         /* 0x00 - 0x03 EEPROM Tag 'CCID' */
	u8 major;         /* 0x04        Board revision, major */
	u8 minor;         /* 0x05        Board revision, minor */
	u8 sn[10];        /* 0x06 - 0x0F Serial Number*/
	u8 errata[2];     /* 0x10 - 0x11 Errata Level */
	u8 date[6];       /* 0x12 - 0x17 Build Date */
	u8 res_0[40];     /* 0x18 - 0x3f Reserved */
	u8 mac_count;     /* 0x40        Number of MAC addresses */
	u8 mac_flag;      /* 0x41        MAC table flags */
	u8 mac[MAX_NUM_PORTS][6];     /* 0x42 - 0x71 MAC addresses */
	u32 crc;          /* 0x72        CRC32 checksum */
#endif
#ifdef CONFIG_SYS_I2C_EEPROM_NXID
	u8 id[4];         /* 0x00 - 0x03 EEPROM Tag 'NXID' */
	u8 sn[12];        /* 0x04 - 0x0F Serial Number */
	u8 errata[5];     /* 0x10 - 0x14 Errata Level */
	u8 date[6];       /* 0x15 - 0x1a Build Date */
	u8 res_0;         /* 0x1b        Reserved */
	u32 version;      /* 0x1c - 0x1f NXID Version */
	u8 tempcal[8];    /* 0x20 - 0x27 Temperature Calibration Factors */
	u8 tempcalsys[2]; /* 0x28 - 0x29 System Temperature Calibration Factors */
	u8 tempcalflags;  /* 0x2a        Temperature Calibration Flags */
	u8 res_1[21];     /* 0x2b - 0x3f Reserved */
	u8 mac_count;     /* 0x40        Number of MAC addresses */
	u8 mac_flag;      /* 0x41        MAC table flags */
	u8 mac[MAX_NUM_PORTS][6];     /* 0x42 - x MAC addresses */
	u32 crc;          /* x+1         CRC32 checksum */
#endif
} e;

/* Set to 1 if we've read EEPROM into memory */
static int has_been_read = 0;

#ifdef CONFIG_SYS_I2C_EEPROM_NXID
/* Is this a valid NXID EEPROM? */
#define is_valid ((e.id[0] == 'N') || (e.id[1] == 'X') || \
		  (e.id[2] == 'I') || (e.id[3] == 'D'))
#endif

#ifdef CONFIG_SYS_I2C_EEPROM_CCID
/* Is this a valid CCID EEPROM? */
#define is_valid ((e.id[0] == 'C') || (e.id[1] == 'C') || \
		  (e.id[2] == 'I') || (e.id[3] == 'D'))
#endif

/**
 * show_eeprom - display the contents of the EEPROM
 */
static void show_eeprom(void)
{
	int i;
	unsigned int crc;

	/* EEPROM tag ID, either CCID or NXID */
#ifdef CONFIG_SYS_I2C_EEPROM_NXID
	printf("ID: %c%c%c%c v%u\n", e.id[0], e.id[1], e.id[2], e.id[3],
		be32_to_cpu(e.version));
#else
	printf("ID: %c%c%c%c\n", e.id[0], e.id[1], e.id[2], e.id[3]);
#endif

	/* Serial number */
	printf("SN: %s\n", e.sn);

	/* Errata level. */
#ifdef CONFIG_SYS_I2C_EEPROM_NXID
	printf("Errata: %s\n", e.errata);
#else
	printf("Errata: %c%c\n",
		e.errata[0] ? e.errata[0] : '.',
		e.errata[1] ? e.errata[1] : '.');
#endif

	/* Build date, BCD date values, as YYMMDDhhmmss */
	printf("Build date: 20%02x/%02x/%02x %02x:%02x:%02x %s\n",
		e.date[0], e.date[1], e.date[2],
		e.date[3] & 0x7F, e.date[4], e.date[5],
		e.date[3] & 0x80 ? "PM" : "");

	/* Show MAC addresses  */
	for (i = 0; i < min(e.mac_count, MAX_NUM_PORTS); i++) {

		u8 *p = e.mac[i];

		printf("Eth%u: %02x:%02x:%02x:%02x:%02x:%02x\n", i,
			p[0], p[1], p[2], p[3],	p[4], p[5]);
	}

	crc = crc32(0, (void *)&e, sizeof(e) - 4);

	if (crc == be32_to_cpu(e.crc))
		printf("CRC: %08x\n", be32_to_cpu(e.crc));
	else
		printf("CRC: %08x (should be %08x)\n",
			be32_to_cpu(e.crc), crc);

#ifdef DEBUG
	printf("EEPROM dump: (0x%x bytes)\n", sizeof(e));
	for (i = 0; i < sizeof(e); i++) {
		if ((i % 16) == 0)
			printf("%02X: ", i);
		printf("%02X ", ((u8 *)&e)[i]);
		if (((i % 16) == 15) || (i == sizeof(e) - 1))
			printf("\n");
	}
#endif
}

/**
 * read_eeprom - read the EEPROM into memory
 */
static int read_eeprom(void)
{
	int ret;
#ifdef CONFIG_SYS_EEPROM_BUS_NUM
	unsigned int bus;
#endif

	if (has_been_read)
		return 0;

#ifdef CONFIG_SYS_EEPROM_BUS_NUM
	bus = i2c_get_bus_num();
	i2c_set_bus_num(CONFIG_SYS_EEPROM_BUS_NUM);
#endif

	ret = i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, 0, CONFIG_SYS_I2C_EEPROM_ADDR_LEN,
		(void *)&e, sizeof(e));

#ifdef CONFIG_SYS_EEPROM_BUS_NUM
	i2c_set_bus_num(bus);
#endif

#ifdef DEBUG
	show_eeprom();
#endif

	has_been_read = (ret == 0) ? 1 : 0;

	return ret;
}

/**
 *  update_crc - update the CRC
 *
 *  This function should be called after each update to the EEPROM structure,
 *  to make sure the CRC is always correct.
 */
static void update_crc(void)
{
	u32 crc;

	crc = crc32(0, (void *)&e, sizeof(e) - 4);
	e.crc = cpu_to_be32(crc);
}

/**
 * prog_eeprom - write the EEPROM from memory
 */
static int prog_eeprom(void)
{
	int ret = 0;
	int i;
	void *p;
#ifdef CONFIG_SYS_EEPROM_BUS_NUM
	unsigned int bus;
#endif

	/* Set the reserved values to 0xFF   */
#ifdef CONFIG_SYS_I2C_EEPROM_NXID
	e.res_0 = 0xFF;
	memset(e.res_1, 0xFF, sizeof(e.res_1));
#else
	memset(e.res_0, 0xFF, sizeof(e.res_0));
#endif
	update_crc();

#ifdef CONFIG_SYS_EEPROM_BUS_NUM
	bus = i2c_get_bus_num();
	i2c_set_bus_num(CONFIG_SYS_EEPROM_BUS_NUM);
#endif

	/*
	 * The AT24C02 datasheet says that data can only be written in page
	 * mode, which means 8 bytes at a time, and it takes up to 5ms to
	 * complete a given write.
	 */
	for (i = 0, p = &e; i < sizeof(e); i += 8, p += 8) {
		ret = i2c_write(CONFIG_SYS_I2C_EEPROM_ADDR, i, CONFIG_SYS_I2C_EEPROM_ADDR_LEN,
			p, min((sizeof(e) - i), 8));
		if (ret)
			break;
		udelay(5000);	/* 5ms write cycle timing */
	}

	if (!ret) {
		/* Verify the write by reading back the EEPROM and comparing */
		struct eeprom e2;

		ret = i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, 0,
			CONFIG_SYS_I2C_EEPROM_ADDR_LEN, (void *)&e2, sizeof(e2));
		if (!ret && memcmp(&e, &e2, sizeof(e)))
			ret = -1;
	}

#ifdef CONFIG_SYS_EEPROM_BUS_NUM
	i2c_set_bus_num(bus);
#endif

	if (ret) {
		printf("Programming failed.\n");
		has_been_read = 0;
		return -1;
	}

	printf("Programming passed.\n");
	return 0;
}

/**
 * h2i - converts hex character into a number
 *
 * This function takes a hexadecimal character (e.g. '7' or 'C') and returns
 * the integer equivalent.
 */
static inline u8 h2i(char p)
{
	if ((p >= '0') && (p <= '9'))
		return p - '0';

	if ((p >= 'A') && (p <= 'F'))
		return (p - 'A') + 10;

	if ((p >= 'a') && (p <= 'f'))
		return (p - 'a') + 10;

	return 0;
}

/**
 * set_date - stores the build date into the EEPROM
 *
 * This function takes a pointer to a string in the format "YYMMDDhhmmss"
 * (2-digit year, 2-digit month, etc), converts it to a 6-byte BCD string,
 * and stores it in the build date field of the EEPROM local copy.
 */
static void set_date(const char *string)
{
	unsigned int i;

	if (strlen(string) != 12) {
		printf("Usage: mac date YYMMDDhhmmss\n");
		return;
	}

	for (i = 0; i < 6; i++)
		e.date[i] = h2i(string[2 * i]) << 4 | h2i(string[2 * i + 1]);

	update_crc();
}

/**
 * set_mac_address - stores a MAC address into the EEPROM
 *
 * This function takes a pointer to MAC address string
 * (i.e."XX:XX:XX:XX:XX:XX", where "XX" is a two-digit hex number) and
 * stores it in one of the MAC address fields of the EEPROM local copy.
 */
static void set_mac_address(unsigned int index, const char *string)
{
	char *p = (char *) string;
	unsigned int i;

	if ((index >= MAX_NUM_PORTS) || !string) {
		printf("Usage: mac <n> XX:XX:XX:XX:XX:XX\n");
		return;
	}

	for (i = 0; *p && (i < 6); i++) {
		e.mac[index][i] = simple_strtoul(p, &p, 16);
		if (*p == ':')
			p++;
	}

	update_crc();
}

int do_mac(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
	char cmd;

	if (argc == 1) {
		show_eeprom();
		return 0;
	}

	cmd = argv[1][0];

	if (cmd == 'r') {
		read_eeprom();
		return 0;
	}

	if (cmd == 'i') {
#ifdef CONFIG_SYS_I2C_EEPROM_NXID
		memcpy(e.id, "NXID", sizeof(e.id));
		e.version = NXID_VERSION;
#else
		memcpy(e.id, "CCID", sizeof(e.id));
#endif
		update_crc();
		return 0;
	}

	if (!is_valid) {
		printf("Please read the EEPROM ('r') and/or set the ID ('i') first.\n");
		return 0;
	}

	if (argc == 2) {
		switch (cmd) {
		case 's':	/* save */
			prog_eeprom();
			break;
		default:
			return cmd_usage(cmdtp);
		}

		return 0;
	}

	/* We know we have at least one parameter  */

	switch (cmd) {
	case 'n':	/* serial number */
		memset(e.sn, 0, sizeof(e.sn));
		strncpy((char *)e.sn, argv[2], sizeof(e.sn) - 1);
		update_crc();
		break;
	case 'e':	/* errata */
#ifdef CONFIG_SYS_I2C_EEPROM_NXID
		memset(e.errata, 0, 5);
		strncpy((char *)e.errata, argv[2], 4);
#else
		e.errata[0] = argv[2][0];
		e.errata[1] = argv[2][1];
#endif
		update_crc();
		break;
	case 'd':	/* date BCD format YYMMDDhhmmss */
		set_date(argv[2]);
		break;
	case 'p':	/* MAC table size */
		e.mac_count = simple_strtoul(argv[2], NULL, 16);
		update_crc();
		break;
	case '0' ... '9':	/* "mac 0" through "mac 22" */
		set_mac_address(simple_strtoul(argv[1], NULL, 10), argv[2]);
		break;
	case 'h':	/* help */
	default:
		return cmd_usage(cmdtp);
	}

	return 0;
}

/**
 * mac_read_from_eeprom - read the MAC addresses from EEPROM
 *
 * This function reads the MAC addresses from EEPROM and sets the
 * appropriate environment variables for each one read.
 *
 * The environment variables are only set if they haven't been set already.
 * This ensures that any user-saved variables are never overwritten.
 *
 * This function must be called after relocation.
 */
int mac_read_from_eeprom(void)
{
	unsigned int i;
	u32 crc;

	puts("EEPROM: ");

	if (read_eeprom()) {
		printf("Read failed.\n");
		return -1;
	}

	if (!is_valid) {
		printf("Invalid ID (%02x %02x %02x %02x)\n",
		       e.id[0], e.id[1], e.id[2], e.id[3]);
		return -1;
	}

	crc = crc32(0, (void *)&e, sizeof(e) - 4);
	if (crc != be32_to_cpu(e.crc)) {
		printf("CRC mismatch (%08x != %08x)\n", crc, be32_to_cpu(e.crc));
		return -1;
	}

	for (i = 0; i < min(e.mac_count, MAX_NUM_PORTS); i++) {
		if (memcmp(&e.mac[i], "\0\0\0\0\0\0", 6) &&
		    memcmp(&e.mac[i], "\xFF\xFF\xFF\xFF\xFF\xFF", 6)) {
			char ethaddr[18];
			char enetvar[9];

			sprintf(ethaddr, "%02X:%02X:%02X:%02X:%02X:%02X",
				e.mac[i][0],
				e.mac[i][1],
				e.mac[i][2],
				e.mac[i][3],
				e.mac[i][4],
				e.mac[i][5]);
			sprintf(enetvar, i ? "eth%daddr" : "ethaddr", i);
			/* Only initialize environment variables that are blank
			 * (i.e. have not yet been set)
			 */
			if (!getenv(enetvar))
				setenv(enetvar, ethaddr);
		}
	}

#ifdef CONFIG_SYS_I2C_EEPROM_NXID
	printf("%c%c%c%c v%u\n", e.id[0], e.id[1], e.id[2], e.id[3],
		be32_to_cpu(e.version));
#else
	printf("%c%c%c%c\n", e.id[0], e.id[1], e.id[2], e.id[3]);
#endif

	return 0;
}

#ifdef CONFIG_SYS_I2C_EEPROM_CCID

/**
 * get_cpu_board_revision - get the CPU board revision on 85xx boards
 *
 * Read the EEPROM to determine the board revision.
 *
 * This function is called before relocation, so we need to read a private
 * copy of the EEPROM into a local variable on the stack.
 *
 * Also, we assume that CONFIG_SYS_EEPROM_BUS_NUM == CONFIG_SYS_SPD_BUS_NUM.  The global
 * variable i2c_bus_num must be compile-time initialized to CONFIG_SYS_SPD_BUS_NUM,
 * so that the SPD code will work.  This means that all pre-relocation I2C
 * operations can only occur on the CONFIG_SYS_SPD_BUS_NUM bus.  So if
 * CONFIG_SYS_EEPROM_BUS_NUM != CONFIG_SYS_SPD_BUS_NUM, then we can't read the EEPROM when
 * this function is called.  Oh well.
 */
unsigned int get_cpu_board_revision(void)
{
	struct board_eeprom {
		u32 id;           /* 0x00 - 0x03 EEPROM Tag 'CCID' */
		u8 major;         /* 0x04        Board revision, major */
		u8 minor;         /* 0x05        Board revision, minor */
	} be;

	i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, 0, CONFIG_SYS_I2C_EEPROM_ADDR_LEN,
		(void *)&be, sizeof(be));

	if (be.id != (('C' << 24) | ('C' << 16) | ('I' << 8) | 'D'))
		return MPC85XX_CPU_BOARD_REV(0, 0);

	if ((be.major == 0xff) && (be.minor == 0xff))
		return MPC85XX_CPU_BOARD_REV(0, 0);

	return MPC85XX_CPU_BOARD_REV(be.major, be.minor);
}
#endif