1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright 2006, 2008-2009, 2011 Freescale Semiconductor
4  * York Sun (yorksun@freescale.com)
5  * Haiying Wang (haiying.wang@freescale.com)
6  * Timur Tabi (timur@freescale.com)
7  */
8 
9 #include <common.h>
10 #include <command.h>
11 #include <i2c.h>
12 #include <linux/ctype.h>
13 
14 #ifdef CONFIG_SYS_I2C_EEPROM_CCID
15 #include "../common/eeprom.h"
16 #define MAX_NUM_PORTS	8
17 #endif
18 
19 #ifdef CONFIG_SYS_I2C_EEPROM_NXID
20 /* some boards with non-256-bytes EEPROM have special define */
21 /* for MAX_NUM_PORTS in board-specific file */
22 #ifndef MAX_NUM_PORTS
23 #define MAX_NUM_PORTS	16
24 #endif
25 #define NXID_VERSION	1
26 #endif
27 
28 /**
29  * static eeprom: EEPROM layout for CCID or NXID formats
30  *
31  * See application note AN3638 for details.
32  */
33 static struct __attribute__ ((__packed__)) eeprom {
34 #ifdef CONFIG_SYS_I2C_EEPROM_CCID
35 	u8 id[4];         /* 0x00 - 0x03 EEPROM Tag 'CCID' */
36 	u8 major;         /* 0x04        Board revision, major */
37 	u8 minor;         /* 0x05        Board revision, minor */
38 	u8 sn[10];        /* 0x06 - 0x0F Serial Number*/
39 	u8 errata[2];     /* 0x10 - 0x11 Errata Level */
40 	u8 date[6];       /* 0x12 - 0x17 Build Date */
41 	u8 res_0[40];     /* 0x18 - 0x3f Reserved */
42 	u8 mac_count;     /* 0x40        Number of MAC addresses */
43 	u8 mac_flag;      /* 0x41        MAC table flags */
44 	u8 mac[MAX_NUM_PORTS][6];     /* 0x42 - 0x71 MAC addresses */
45 	u32 crc;          /* 0x72        CRC32 checksum */
46 #endif
47 #ifdef CONFIG_SYS_I2C_EEPROM_NXID
48 	u8 id[4];         /* 0x00 - 0x03 EEPROM Tag 'NXID' */
49 	u8 sn[12];        /* 0x04 - 0x0F Serial Number */
50 	u8 errata[5];     /* 0x10 - 0x14 Errata Level */
51 	u8 date[6];       /* 0x15 - 0x1a Build Date */
52 	u8 res_0;         /* 0x1b        Reserved */
53 	u32 version;      /* 0x1c - 0x1f NXID Version */
54 	u8 tempcal[8];    /* 0x20 - 0x27 Temperature Calibration Factors */
55 	u8 tempcalsys[2]; /* 0x28 - 0x29 System Temperature Calibration Factors */
56 	u8 tempcalflags;  /* 0x2a        Temperature Calibration Flags */
57 	u8 res_1[21];     /* 0x2b - 0x3f Reserved */
58 	u8 mac_count;     /* 0x40        Number of MAC addresses */
59 	u8 mac_flag;      /* 0x41        MAC table flags */
60 	u8 mac[MAX_NUM_PORTS][6];     /* 0x42 - 0xa1 MAC addresses */
61 	u8 res_2[90];     /* 0xa2 - 0xfb Reserved */
62 	u32 crc;          /* 0xfc - 0xff CRC32 checksum */
63 #endif
64 } e;
65 
66 /* Set to 1 if we've read EEPROM into memory */
67 static int has_been_read = 0;
68 
69 #ifdef CONFIG_SYS_I2C_EEPROM_NXID
70 /* Is this a valid NXID EEPROM? */
71 #define is_valid ((e.id[0] == 'N') || (e.id[1] == 'X') || \
72 		  (e.id[2] == 'I') || (e.id[3] == 'D'))
73 #endif
74 
75 #ifdef CONFIG_SYS_I2C_EEPROM_CCID
76 /* Is this a valid CCID EEPROM? */
77 #define is_valid ((e.id[0] == 'C') || (e.id[1] == 'C') || \
78 		  (e.id[2] == 'I') || (e.id[3] == 'D'))
79 #endif
80 
81 /**
82  * show_eeprom - display the contents of the EEPROM
83  */
84 static void show_eeprom(void)
85 {
86 	int i;
87 	unsigned int crc;
88 
89 	/* EEPROM tag ID, either CCID or NXID */
90 #ifdef CONFIG_SYS_I2C_EEPROM_NXID
91 	printf("ID: %c%c%c%c v%u\n", e.id[0], e.id[1], e.id[2], e.id[3],
92 	       be32_to_cpu(e.version));
93 #else
94 	printf("ID: %c%c%c%c\n", e.id[0], e.id[1], e.id[2], e.id[3]);
95 #endif
96 
97 	/* Serial number */
98 	printf("SN: %s\n", e.sn);
99 
100 	/* Errata level. */
101 #ifdef CONFIG_SYS_I2C_EEPROM_NXID
102 	printf("Errata: %s\n", e.errata);
103 #else
104 	printf("Errata: %c%c\n",
105 		e.errata[0] ? e.errata[0] : '.',
106 		e.errata[1] ? e.errata[1] : '.');
107 #endif
108 
109 	/* Build date, BCD date values, as YYMMDDhhmmss */
110 	printf("Build date: 20%02x/%02x/%02x %02x:%02x:%02x %s\n",
111 		e.date[0], e.date[1], e.date[2],
112 		e.date[3] & 0x7F, e.date[4], e.date[5],
113 		e.date[3] & 0x80 ? "PM" : "");
114 
115 	/* Show MAC addresses  */
116 	for (i = 0; i < min(e.mac_count, (u8)MAX_NUM_PORTS); i++) {
117 
118 		u8 *p = e.mac[i];
119 
120 		printf("Eth%u: %02x:%02x:%02x:%02x:%02x:%02x\n", i,
121 			p[0], p[1], p[2], p[3],	p[4], p[5]);
122 	}
123 
124 	crc = crc32(0, (void *)&e, sizeof(e) - 4);
125 
126 	if (crc == be32_to_cpu(e.crc))
127 		printf("CRC: %08x\n", be32_to_cpu(e.crc));
128 	else
129 		printf("CRC: %08x (should be %08x)\n",
130 			be32_to_cpu(e.crc), crc);
131 
132 #ifdef DEBUG
133 	printf("EEPROM dump: (0x%x bytes)\n", sizeof(e));
134 	for (i = 0; i < sizeof(e); i++) {
135 		if ((i % 16) == 0)
136 			printf("%02X: ", i);
137 		printf("%02X ", ((u8 *)&e)[i]);
138 		if (((i % 16) == 15) || (i == sizeof(e) - 1))
139 			printf("\n");
140 	}
141 #endif
142 }
143 
144 /**
145  * read_eeprom - read the EEPROM into memory
146  */
147 static int read_eeprom(void)
148 {
149 	int ret;
150 #ifdef CONFIG_SYS_EEPROM_BUS_NUM
151 	unsigned int bus;
152 #endif
153 
154 	if (has_been_read)
155 		return 0;
156 
157 #ifdef CONFIG_SYS_EEPROM_BUS_NUM
158 	bus = i2c_get_bus_num();
159 	i2c_set_bus_num(CONFIG_SYS_EEPROM_BUS_NUM);
160 #endif
161 
162 	ret = i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, 0, CONFIG_SYS_I2C_EEPROM_ADDR_LEN,
163 		(void *)&e, sizeof(e));
164 
165 #ifdef CONFIG_SYS_EEPROM_BUS_NUM
166 	i2c_set_bus_num(bus);
167 #endif
168 
169 #ifdef DEBUG
170 	show_eeprom();
171 #endif
172 
173 	has_been_read = (ret == 0) ? 1 : 0;
174 
175 	return ret;
176 }
177 
178 /**
179  *  update_crc - update the CRC
180  *
181  *  This function should be called after each update to the EEPROM structure,
182  *  to make sure the CRC is always correct.
183  */
184 static void update_crc(void)
185 {
186 	u32 crc;
187 
188 	crc = crc32(0, (void *)&e, sizeof(e) - 4);
189 	e.crc = cpu_to_be32(crc);
190 }
191 
192 /**
193  * prog_eeprom - write the EEPROM from memory
194  */
195 static int prog_eeprom(void)
196 {
197 	int ret = 0;
198 	int i;
199 	void *p;
200 #ifdef CONFIG_SYS_EEPROM_BUS_NUM
201 	unsigned int bus;
202 #endif
203 
204 	/* Set the reserved values to 0xFF   */
205 #ifdef CONFIG_SYS_I2C_EEPROM_NXID
206 	e.res_0 = 0xFF;
207 	memset(e.res_1, 0xFF, sizeof(e.res_1));
208 #else
209 	memset(e.res_0, 0xFF, sizeof(e.res_0));
210 #endif
211 	update_crc();
212 
213 #ifdef CONFIG_SYS_EEPROM_BUS_NUM
214 	bus = i2c_get_bus_num();
215 	i2c_set_bus_num(CONFIG_SYS_EEPROM_BUS_NUM);
216 #endif
217 
218 	/*
219 	 * The AT24C02 datasheet says that data can only be written in page
220 	 * mode, which means 8 bytes at a time, and it takes up to 5ms to
221 	 * complete a given write.
222 	 */
223 	for (i = 0, p = &e; i < sizeof(e); i += 8, p += 8) {
224 		ret = i2c_write(CONFIG_SYS_I2C_EEPROM_ADDR, i, CONFIG_SYS_I2C_EEPROM_ADDR_LEN,
225 				p, min((int)(sizeof(e) - i), 8));
226 		if (ret)
227 			break;
228 		udelay(5000);	/* 5ms write cycle timing */
229 	}
230 
231 	if (!ret) {
232 		/* Verify the write by reading back the EEPROM and comparing */
233 		struct eeprom e2;
234 
235 		ret = i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, 0,
236 			CONFIG_SYS_I2C_EEPROM_ADDR_LEN, (void *)&e2, sizeof(e2));
237 		if (!ret && memcmp(&e, &e2, sizeof(e)))
238 			ret = -1;
239 	}
240 
241 #ifdef CONFIG_SYS_EEPROM_BUS_NUM
242 	i2c_set_bus_num(bus);
243 #endif
244 
245 	if (ret) {
246 		printf("Programming failed.\n");
247 		has_been_read = 0;
248 		return -1;
249 	}
250 
251 	printf("Programming passed.\n");
252 	return 0;
253 }
254 
255 /**
256  * h2i - converts hex character into a number
257  *
258  * This function takes a hexadecimal character (e.g. '7' or 'C') and returns
259  * the integer equivalent.
260  */
261 static inline u8 h2i(char p)
262 {
263 	if ((p >= '0') && (p <= '9'))
264 		return p - '0';
265 
266 	if ((p >= 'A') && (p <= 'F'))
267 		return (p - 'A') + 10;
268 
269 	if ((p >= 'a') && (p <= 'f'))
270 		return (p - 'a') + 10;
271 
272 	return 0;
273 }
274 
275 /**
276  * set_date - stores the build date into the EEPROM
277  *
278  * This function takes a pointer to a string in the format "YYMMDDhhmmss"
279  * (2-digit year, 2-digit month, etc), converts it to a 6-byte BCD string,
280  * and stores it in the build date field of the EEPROM local copy.
281  */
282 static void set_date(const char *string)
283 {
284 	unsigned int i;
285 
286 	if (strlen(string) != 12) {
287 		printf("Usage: mac date YYMMDDhhmmss\n");
288 		return;
289 	}
290 
291 	for (i = 0; i < 6; i++)
292 		e.date[i] = h2i(string[2 * i]) << 4 | h2i(string[2 * i + 1]);
293 
294 	update_crc();
295 }
296 
297 /**
298  * set_mac_address - stores a MAC address into the EEPROM
299  *
300  * This function takes a pointer to MAC address string
301  * (i.e."XX:XX:XX:XX:XX:XX", where "XX" is a two-digit hex number) and
302  * stores it in one of the MAC address fields of the EEPROM local copy.
303  */
304 static void set_mac_address(unsigned int index, const char *string)
305 {
306 	char *p = (char *) string;
307 	unsigned int i;
308 
309 	if ((index >= MAX_NUM_PORTS) || !string) {
310 		printf("Usage: mac <n> XX:XX:XX:XX:XX:XX\n");
311 		return;
312 	}
313 
314 	for (i = 0; *p && (i < 6); i++) {
315 		e.mac[index][i] = simple_strtoul(p, &p, 16);
316 		if (*p == ':')
317 			p++;
318 	}
319 
320 	update_crc();
321 }
322 
323 int do_mac(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
324 {
325 	char cmd;
326 
327 	if (argc == 1) {
328 		show_eeprom();
329 		return 0;
330 	}
331 
332 	cmd = argv[1][0];
333 
334 	if (cmd == 'r') {
335 		read_eeprom();
336 		return 0;
337 	}
338 
339 	if (cmd == 'i') {
340 #ifdef CONFIG_SYS_I2C_EEPROM_NXID
341 		memcpy(e.id, "NXID", sizeof(e.id));
342 		e.version = cpu_to_be32(NXID_VERSION);
343 #else
344 		memcpy(e.id, "CCID", sizeof(e.id));
345 #endif
346 		update_crc();
347 		return 0;
348 	}
349 
350 	if (!is_valid) {
351 		printf("Please read the EEPROM ('r') and/or set the ID ('i') first.\n");
352 		return 0;
353 	}
354 
355 	if (argc == 2) {
356 		switch (cmd) {
357 		case 's':	/* save */
358 			prog_eeprom();
359 			break;
360 		default:
361 			return cmd_usage(cmdtp);
362 		}
363 
364 		return 0;
365 	}
366 
367 	/* We know we have at least one parameter  */
368 
369 	switch (cmd) {
370 	case 'n':	/* serial number */
371 		memset(e.sn, 0, sizeof(e.sn));
372 		strncpy((char *)e.sn, argv[2], sizeof(e.sn) - 1);
373 		update_crc();
374 		break;
375 	case 'e':	/* errata */
376 #ifdef CONFIG_SYS_I2C_EEPROM_NXID
377 		memset(e.errata, 0, 5);
378 		strncpy((char *)e.errata, argv[2], 4);
379 #else
380 		e.errata[0] = argv[2][0];
381 		e.errata[1] = argv[2][1];
382 #endif
383 		update_crc();
384 		break;
385 	case 'd':	/* date BCD format YYMMDDhhmmss */
386 		set_date(argv[2]);
387 		break;
388 	case 'p':	/* MAC table size */
389 		e.mac_count = simple_strtoul(argv[2], NULL, 16);
390 		update_crc();
391 		break;
392 	case '0' ... '9':	/* "mac 0" through "mac 22" */
393 		set_mac_address(simple_strtoul(argv[1], NULL, 10), argv[2]);
394 		break;
395 	case 'h':	/* help */
396 	default:
397 		return cmd_usage(cmdtp);
398 	}
399 
400 	return 0;
401 }
402 
403 /**
404  * mac_read_from_eeprom - read the MAC addresses from EEPROM
405  *
406  * This function reads the MAC addresses from EEPROM and sets the
407  * appropriate environment variables for each one read.
408  *
409  * The environment variables are only set if they haven't been set already.
410  * This ensures that any user-saved variables are never overwritten.
411  *
412  * This function must be called after relocation.
413  *
414  * For NXID v1 EEPROMs, we support loading and up-converting the older NXID v0
415  * format.  In a v0 EEPROM, there are only eight MAC addresses and the CRC is
416  * located at a different offset.
417  */
418 int mac_read_from_eeprom(void)
419 {
420 	unsigned int i;
421 	u32 crc, crc_offset = offsetof(struct eeprom, crc);
422 	u32 *crcp; /* Pointer to the CRC in the data read from the EEPROM */
423 
424 	puts("EEPROM: ");
425 
426 	if (read_eeprom()) {
427 		printf("Read failed.\n");
428 		return 0;
429 	}
430 
431 	if (!is_valid) {
432 		printf("Invalid ID (%02x %02x %02x %02x)\n",
433 		       e.id[0], e.id[1], e.id[2], e.id[3]);
434 		return 0;
435 	}
436 
437 #ifdef CONFIG_SYS_I2C_EEPROM_NXID
438 	/*
439 	 * If we've read an NXID v0 EEPROM, then we need to set the CRC offset
440 	 * to where it is in v0.
441 	 */
442 	if (e.version == 0)
443 		crc_offset = 0x72;
444 #endif
445 
446 	crc = crc32(0, (void *)&e, crc_offset);
447 	crcp = (void *)&e + crc_offset;
448 	if (crc != be32_to_cpu(*crcp)) {
449 		printf("CRC mismatch (%08x != %08x)\n", crc, be32_to_cpu(e.crc));
450 		return 0;
451 	}
452 
453 #ifdef CONFIG_SYS_I2C_EEPROM_NXID
454 	/*
455 	 * MAC address #9 in v1 occupies the same position as the CRC in v0.
456 	 * Erase it so that it's not mistaken for a MAC address.  We'll
457 	 * update the CRC later.
458 	 */
459 	if (e.version == 0)
460 		memset(e.mac[8], 0xff, 6);
461 #endif
462 
463 	for (i = 0; i < min(e.mac_count, (u8)MAX_NUM_PORTS); i++) {
464 		if (memcmp(&e.mac[i], "\0\0\0\0\0\0", 6) &&
465 		    memcmp(&e.mac[i], "\xFF\xFF\xFF\xFF\xFF\xFF", 6)) {
466 			char ethaddr[18];
467 			char enetvar[9];
468 
469 			sprintf(ethaddr, "%02X:%02X:%02X:%02X:%02X:%02X",
470 				e.mac[i][0],
471 				e.mac[i][1],
472 				e.mac[i][2],
473 				e.mac[i][3],
474 				e.mac[i][4],
475 				e.mac[i][5]);
476 			sprintf(enetvar, i ? "eth%daddr" : "ethaddr", i);
477 			/* Only initialize environment variables that are blank
478 			 * (i.e. have not yet been set)
479 			 */
480 			if (!env_get(enetvar))
481 				env_set(enetvar, ethaddr);
482 		}
483 	}
484 
485 #ifdef CONFIG_SYS_I2C_EEPROM_NXID
486 	printf("%c%c%c%c v%u\n", e.id[0], e.id[1], e.id[2], e.id[3],
487 	       be32_to_cpu(e.version));
488 #else
489 	printf("%c%c%c%c\n", e.id[0], e.id[1], e.id[2], e.id[3]);
490 #endif
491 
492 #ifdef CONFIG_SYS_I2C_EEPROM_NXID
493 	/*
494 	 * Now we need to upconvert the data into v1 format.  We do this last so
495 	 * that at boot time, U-Boot will still say "NXID v0".
496 	 */
497 	if (e.version == 0) {
498 		e.version = cpu_to_be32(NXID_VERSION);
499 		update_crc();
500 	}
501 #endif
502 
503 	return 0;
504 }
505 
506 #ifdef CONFIG_SYS_I2C_EEPROM_CCID
507 
508 /**
509  * get_cpu_board_revision - get the CPU board revision on 85xx boards
510  *
511  * Read the EEPROM to determine the board revision.
512  *
513  * This function is called before relocation, so we need to read a private
514  * copy of the EEPROM into a local variable on the stack.
515  *
516  * Also, we assume that CONFIG_SYS_EEPROM_BUS_NUM == CONFIG_SYS_SPD_BUS_NUM.  The global
517  * variable i2c_bus_num must be compile-time initialized to CONFIG_SYS_SPD_BUS_NUM,
518  * so that the SPD code will work.  This means that all pre-relocation I2C
519  * operations can only occur on the CONFIG_SYS_SPD_BUS_NUM bus.  So if
520  * CONFIG_SYS_EEPROM_BUS_NUM != CONFIG_SYS_SPD_BUS_NUM, then we can't read the EEPROM when
521  * this function is called.  Oh well.
522  */
523 unsigned int get_cpu_board_revision(void)
524 {
525 	struct board_eeprom {
526 		u32 id;           /* 0x00 - 0x03 EEPROM Tag 'CCID' */
527 		u8 major;         /* 0x04        Board revision, major */
528 		u8 minor;         /* 0x05        Board revision, minor */
529 	} be;
530 
531 	i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, 0, CONFIG_SYS_I2C_EEPROM_ADDR_LEN,
532 		(void *)&be, sizeof(be));
533 
534 	if (be.id != (('C' << 24) | ('C' << 16) | ('I' << 8) | 'D'))
535 		return MPC85XX_CPU_BOARD_REV(0, 0);
536 
537 	if ((be.major == 0xff) && (be.minor == 0xff))
538 		return MPC85XX_CPU_BOARD_REV(0, 0);
539 
540 	return MPC85XX_CPU_BOARD_REV(be.major, be.minor);
541 }
542 #endif
543