1 /*
2  * Copyright 2006, 2008-2009 Freescale Semiconductor
3  * York Sun (yorksun@freescale.com)
4  * Haiying Wang (haiying.wang@freescale.com)
5  * Timur Tabi (timur@freescale.com)
6  *
7  * See file CREDITS for list of people who contributed to this
8  * project.
9  *
10  * This program is free software; you can redistribute it and/or
11  * modify it under the terms of the GNU General Public License as
12  * published by the Free Software Foundation; either version 2 of
13  * the License, or (at your option) any later version.
14  *
15  * This program is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18  * GNU General Public License for more details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with this program; if not, write to the Free Software
22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
23  * MA 02111-1307 USA
24  */
25 
26 #include <common.h>
27 #include <command.h>
28 #include <i2c.h>
29 #include <linux/ctype.h>
30 
31 #include "../common/eeprom.h"
32 
33 #if !defined(CONFIG_SYS_I2C_EEPROM_CCID) && !defined(CONFIG_SYS_I2C_EEPROM_NXID)
34 #error "Please define either CONFIG_SYS_I2C_EEPROM_CCID or CONFIG_SYS_I2C_EEPROM_NXID"
35 #endif
36 
37 #define MAX_NUM_PORTS	8	/* This value must be 8 as defined in doc */
38 
39 /**
40  * static eeprom: EEPROM layout for CCID or NXID formats
41  *
42  * See application note AN3638 for details.
43  */
44 static struct __attribute__ ((__packed__)) eeprom {
45 #ifdef CONFIG_SYS_I2C_EEPROM_CCID
46 	u8 id[4];         /* 0x00 - 0x03 EEPROM Tag 'CCID' */
47 	u8 major;         /* 0x04        Board revision, major */
48 	u8 minor;         /* 0x05        Board revision, minor */
49 	u8 sn[10];        /* 0x06 - 0x0F Serial Number*/
50 	u8 errata[2];     /* 0x10 - 0x11 Errata Level */
51 	u8 date[6];       /* 0x12 - 0x17 Build Date */
52 	u8 res_0[40];     /* 0x18 - 0x3f Reserved */
53 	u8 mac_count;     /* 0x40        Number of MAC addresses */
54 	u8 mac_flag;      /* 0x41        MAC table flags */
55 	u8 mac[MAX_NUM_PORTS][6];     /* 0x42 - 0x71 MAC addresses */
56 	u32 crc;          /* 0x72        CRC32 checksum */
57 #endif
58 #ifdef CONFIG_SYS_I2C_EEPROM_NXID
59 	u8 id[4];         /* 0x00 - 0x03 EEPROM Tag 'NXID' */
60 	u8 sn[12];        /* 0x04 - 0x0F Serial Number */
61 	u8 errata[5];     /* 0x10 - 0x14 Errata Level */
62 	u8 date[6];       /* 0x15 - 0x1a Build Date */
63 	u8 res_0;         /* 0x1b        Reserved */
64 	u32 version;      /* 0x1c - 0x1f NXID Version */
65 	u8 tempcal[8];    /* 0x20 - 0x27 Temperature Calibration Factors */
66 	u8 tempcalsys[2]; /* 0x28 - 0x29 System Temperature Calibration Factors */
67 	u8 tempcalflags;  /* 0x2a        Temperature Calibration Flags */
68 	u8 res_1[21];     /* 0x2b - 0x3f Reserved */
69 	u8 mac_count;     /* 0x40        Number of MAC addresses */
70 	u8 mac_flag;      /* 0x41        MAC table flags */
71 	u8 mac[MAX_NUM_PORTS][6];     /* 0x42 - 0x71 MAC addresses */
72 	u32 crc;          /* 0x72        CRC32 checksum */
73 #endif
74 } e;
75 
76 /* Set to 1 if we've read EEPROM into memory */
77 static int has_been_read = 0;
78 
79 #ifdef CONFIG_SYS_I2C_EEPROM_NXID
80 /* Is this a valid NXID EEPROM? */
81 #define is_valid ((e.id[0] == 'N') || (e.id[1] == 'X') || \
82 		  (e.id[2] == 'I') || (e.id[3] == 'D'))
83 #endif
84 
85 #ifdef CONFIG_SYS_I2C_EEPROM_CCID
86 /* Is this a valid CCID EEPROM? */
87 #define is_valid ((e.id[0] == 'C') || (e.id[1] == 'C') || \
88 		  (e.id[2] == 'I') || (e.id[3] == 'D'))
89 #endif
90 
91 /**
92  * show_eeprom - display the contents of the EEPROM
93  */
94 static void show_eeprom(void)
95 {
96 	int i;
97 	unsigned int crc;
98 
99 	/* EEPROM tag ID, either CCID or NXID */
100 #ifdef CONFIG_SYS_I2C_EEPROM_NXID
101 	printf("ID: %c%c%c%c v%u\n", e.id[0], e.id[1], e.id[2], e.id[3],
102 		be32_to_cpu(e.version));
103 #else
104 	printf("ID: %c%c%c%c\n", e.id[0], e.id[1], e.id[2], e.id[3]);
105 #endif
106 
107 	/* Serial number */
108 	printf("SN: %s\n", e.sn);
109 
110 	/* Errata level. */
111 #ifdef CONFIG_SYS_I2C_EEPROM_NXID
112 	printf("Errata: %s\n", e.errata);
113 #else
114 	printf("Errata: %c%c\n",
115 		e.errata[0] ? e.errata[0] : '.',
116 		e.errata[1] ? e.errata[1] : '.');
117 #endif
118 
119 	/* Build date, BCD date values, as YYMMDDhhmmss */
120 	printf("Build date: 20%02x/%02x/%02x %02x:%02x:%02x %s\n",
121 		e.date[0], e.date[1], e.date[2],
122 		e.date[3] & 0x7F, e.date[4], e.date[5],
123 		e.date[3] & 0x80 ? "PM" : "");
124 
125 	/* Show MAC addresses  */
126 	for (i = 0; i < min(e.mac_count, MAX_NUM_PORTS); i++) {
127 
128 		u8 *p = e.mac[i];
129 
130 		printf("Eth%u: %02x:%02x:%02x:%02x:%02x:%02x\n", i,
131 			p[0], p[1], p[2], p[3],	p[4], p[5]);
132 	}
133 
134 	crc = crc32(0, (void *)&e, sizeof(e) - 4);
135 
136 	if (crc == be32_to_cpu(e.crc))
137 		printf("CRC: %08x\n", be32_to_cpu(e.crc));
138 	else
139 		printf("CRC: %08x (should be %08x)\n",
140 			be32_to_cpu(e.crc), crc);
141 
142 #ifdef DEBUG
143 	printf("EEPROM dump: (0x%x bytes)\n", sizeof(e));
144 	for (i = 0; i < sizeof(e); i++) {
145 		if ((i % 16) == 0)
146 			printf("%02X: ", i);
147 		printf("%02X ", ((u8 *)&e)[i]);
148 		if (((i % 16) == 15) || (i == sizeof(e) - 1))
149 			printf("\n");
150 	}
151 #endif
152 }
153 
154 /**
155  * read_eeprom - read the EEPROM into memory
156  */
157 static int read_eeprom(void)
158 {
159 	int ret;
160 #ifdef CONFIG_SYS_EEPROM_BUS_NUM
161 	unsigned int bus;
162 #endif
163 
164 	if (has_been_read)
165 		return 0;
166 
167 #ifdef CONFIG_SYS_EEPROM_BUS_NUM
168 	bus = i2c_get_bus_num();
169 	i2c_set_bus_num(CONFIG_SYS_EEPROM_BUS_NUM);
170 #endif
171 
172 	ret = i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, 0, CONFIG_SYS_I2C_EEPROM_ADDR_LEN,
173 		(void *)&e, sizeof(e));
174 
175 #ifdef CONFIG_SYS_EEPROM_BUS_NUM
176 	i2c_set_bus_num(bus);
177 #endif
178 
179 #ifdef DEBUG
180 	show_eeprom();
181 #endif
182 
183 	has_been_read = (ret == 0) ? 1 : 0;
184 
185 	return ret;
186 }
187 
188 /**
189  *  update_crc - update the CRC
190  *
191  *  This function should be called after each update to the EEPROM structure,
192  *  to make sure the CRC is always correct.
193  */
194 static void update_crc(void)
195 {
196 	u32 crc;
197 
198 	crc = crc32(0, (void *)&e, sizeof(e) - 4);
199 	e.crc = cpu_to_be32(crc);
200 }
201 
202 /**
203  * prog_eeprom - write the EEPROM from memory
204  */
205 static int prog_eeprom(void)
206 {
207 	int ret = 0; /* shut up gcc */
208 	int i;
209 	void *p;
210 #ifdef CONFIG_SYS_EEPROM_BUS_NUM
211 	unsigned int bus;
212 #endif
213 
214 	/* Set the reserved values to 0xFF   */
215 #ifdef CONFIG_SYS_I2C_EEPROM_NXID
216 	e.res_0 = 0xFF;
217 	memset(e.res_1, 0xFF, sizeof(e.res_1));
218 #else
219 	memset(e.res_0, 0xFF, sizeof(e.res_0));
220 #endif
221 	update_crc();
222 
223 #ifdef CONFIG_SYS_EEPROM_BUS_NUM
224 	bus = i2c_get_bus_num();
225 	i2c_set_bus_num(CONFIG_SYS_EEPROM_BUS_NUM);
226 #endif
227 
228 	for (i = 0, p = &e; i < sizeof(e); i += 8, p += 8) {
229 		ret = i2c_write(CONFIG_SYS_I2C_EEPROM_ADDR, i, CONFIG_SYS_I2C_EEPROM_ADDR_LEN,
230 			p, min((sizeof(e) - i), 8));
231 		if (ret)
232 			break;
233 		udelay(5000);	/* 5ms write cycle timing */
234 	}
235 
236 #ifdef CONFIG_SYS_EEPROM_BUS_NUM
237 	i2c_set_bus_num(bus);
238 #endif
239 
240 	if (ret) {
241 		printf("Programming failed.\n");
242 		return -1;
243 	}
244 
245 	printf("Programming passed.\n");
246 	return 0;
247 }
248 
249 /**
250  * h2i - converts hex character into a number
251  *
252  * This function takes a hexadecimal character (e.g. '7' or 'C') and returns
253  * the integer equivalent.
254  */
255 static inline u8 h2i(char p)
256 {
257 	if ((p >= '0') && (p <= '9'))
258 		return p - '0';
259 
260 	if ((p >= 'A') && (p <= 'F'))
261 		return (p - 'A') + 10;
262 
263 	if ((p >= 'a') && (p <= 'f'))
264 		return (p - 'a') + 10;
265 
266 	return 0;
267 }
268 
269 /**
270  * set_date - stores the build date into the EEPROM
271  *
272  * This function takes a pointer to a string in the format "YYMMDDhhmmss"
273  * (2-digit year, 2-digit month, etc), converts it to a 6-byte BCD string,
274  * and stores it in the build date field of the EEPROM local copy.
275  */
276 static void set_date(const char *string)
277 {
278 	unsigned int i;
279 
280 	if (strlen(string) != 12) {
281 		printf("Usage: mac date YYMMDDhhmmss\n");
282 		return;
283 	}
284 
285 	for (i = 0; i < 6; i++)
286 		e.date[i] = h2i(string[2 * i]) << 4 | h2i(string[2 * i + 1]);
287 
288 	update_crc();
289 }
290 
291 /**
292  * set_mac_address - stores a MAC address into the EEPROM
293  *
294  * This function takes a pointer to MAC address string
295  * (i.e."XX:XX:XX:XX:XX:XX", where "XX" is a two-digit hex number) and
296  * stores it in one of the MAC address fields of the EEPROM local copy.
297  */
298 static void set_mac_address(unsigned int index, const char *string)
299 {
300 	char *p = (char *) string;
301 	unsigned int i;
302 
303 	if (!string) {
304 		printf("Usage: mac <n> XX:XX:XX:XX:XX:XX\n");
305 		return;
306 	}
307 
308 	for (i = 0; *p && (i < 6); i++) {
309 		e.mac[index][i] = simple_strtoul(p, &p, 16);
310 		if (*p == ':')
311 			p++;
312 	}
313 
314 	update_crc();
315 }
316 
317 int do_mac(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
318 {
319 	char cmd;
320 
321 	if (argc == 1) {
322 		show_eeprom();
323 		return 0;
324 	}
325 
326 	cmd = argv[1][0];
327 
328 	if (cmd == 'r') {
329 		read_eeprom();
330 		return 0;
331 	}
332 
333 	if (cmd == 'i') {
334 #ifdef CONFIG_SYS_I2C_EEPROM_NXID
335 		memcpy(e.id, "NXID", sizeof(e.id));
336 		e.version = 0;
337 #else
338 		memcpy(e.id, "CCID", sizeof(e.id));
339 #endif
340 		return 0;
341 	}
342 
343 	if (!is_valid) {
344 		printf("Please read the EEPROM ('r') and/or set the ID ('i') first.\n");
345 		return 0;
346 	}
347 
348 	if (argc == 2) {
349 		switch (cmd) {
350 		case 's':	/* save */
351 			prog_eeprom();
352 			break;
353 		default:
354 			return cmd_usage(cmdtp);
355 		}
356 
357 		return 0;
358 	}
359 
360 	/* We know we have at least one parameter  */
361 
362 	switch (cmd) {
363 	case 'n':	/* serial number */
364 		memset(e.sn, 0, sizeof(e.sn));
365 		strncpy((char *)e.sn, argv[2], sizeof(e.sn) - 1);
366 		update_crc();
367 		break;
368 	case 'e':	/* errata */
369 #ifdef CONFIG_SYS_I2C_EEPROM_NXID
370 		memset(e.errata, 0, 5);
371 		strncpy((char *)e.errata, argv[2], 4);
372 #else
373 		e.errata[0] = argv[2][0];
374 		e.errata[1] = argv[2][1];
375 #endif
376 		update_crc();
377 		break;
378 	case 'd':	/* date BCD format YYMMDDhhmmss */
379 		set_date(argv[2]);
380 		break;
381 	case 'p':	/* MAC table size */
382 		e.mac_count = simple_strtoul(argv[2], NULL, 16);
383 		update_crc();
384 		break;
385 	case '0' ... '7':	/* "mac 0" through "mac 7" */
386 		set_mac_address(cmd - '0', argv[2]);
387 		break;
388 	case 'h':	/* help */
389 	default:
390 		return cmd_usage(cmdtp);
391 	}
392 
393 	return 0;
394 }
395 
396 /**
397  * mac_read_from_eeprom - read the MAC addresses from EEPROM
398  *
399  * This function reads the MAC addresses from EEPROM and sets the
400  * appropriate environment variables for each one read.
401  *
402  * The environment variables are only set if they haven't been set already.
403  * This ensures that any user-saved variables are never overwritten.
404  *
405  * This function must be called after relocation.
406  */
407 int mac_read_from_eeprom(void)
408 {
409 	unsigned int i;
410 	u32 crc;
411 
412 	puts("EEPROM: ");
413 
414 	if (read_eeprom()) {
415 		printf("Read failed.\n");
416 		return -1;
417 	}
418 
419 	if (!is_valid) {
420 		printf("Invalid ID (%02x %02x %02x %02x)\n",
421 		       e.id[0], e.id[1], e.id[2], e.id[3]);
422 		return -1;
423 	}
424 
425 	crc = crc32(0, (void *)&e, sizeof(e) - 4);
426 	if (crc != be32_to_cpu(e.crc)) {
427 		printf("CRC mismatch (%08x != %08x)\n", crc, be32_to_cpu(e.crc));
428 		return -1;
429 	}
430 
431 	for (i = 0; i < min(e.mac_count, MAX_NUM_PORTS); i++) {
432 		if (memcmp(&e.mac[i], "\0\0\0\0\0\0", 6) &&
433 		    memcmp(&e.mac[i], "\xFF\xFF\xFF\xFF\xFF\xFF", 6)) {
434 			char ethaddr[18];
435 			char enetvar[9];
436 
437 			sprintf(ethaddr, "%02X:%02X:%02X:%02X:%02X:%02X",
438 				e.mac[i][0],
439 				e.mac[i][1],
440 				e.mac[i][2],
441 				e.mac[i][3],
442 				e.mac[i][4],
443 				e.mac[i][5]);
444 			sprintf(enetvar, i ? "eth%daddr" : "ethaddr", i);
445 			/* Only initialize environment variables that are blank
446 			 * (i.e. have not yet been set)
447 			 */
448 			if (!getenv(enetvar))
449 				setenv(enetvar, ethaddr);
450 		}
451 	}
452 
453 #ifdef CONFIG_SYS_I2C_EEPROM_NXID
454 	printf("%c%c%c%c v%u\n", e.id[0], e.id[1], e.id[2], e.id[3],
455 		be32_to_cpu(e.version));
456 #else
457 	printf("%c%c%c%c\n", e.id[0], e.id[1], e.id[2], e.id[3]);
458 #endif
459 
460 	return 0;
461 }
462 
463 #ifdef CONFIG_SYS_I2C_EEPROM_CCID
464 
465 /**
466  * get_cpu_board_revision - get the CPU board revision on 85xx boards
467  *
468  * Read the EEPROM to determine the board revision.
469  *
470  * This function is called before relocation, so we need to read a private
471  * copy of the EEPROM into a local variable on the stack.
472  *
473  * Also, we assume that CONFIG_SYS_EEPROM_BUS_NUM == CONFIG_SYS_SPD_BUS_NUM.  The global
474  * variable i2c_bus_num must be compile-time initialized to CONFIG_SYS_SPD_BUS_NUM,
475  * so that the SPD code will work.  This means that all pre-relocation I2C
476  * operations can only occur on the CONFIG_SYS_SPD_BUS_NUM bus.  So if
477  * CONFIG_SYS_EEPROM_BUS_NUM != CONFIG_SYS_SPD_BUS_NUM, then we can't read the EEPROM when
478  * this function is called.  Oh well.
479  */
480 unsigned int get_cpu_board_revision(void)
481 {
482 	struct board_eeprom {
483 		u32 id;           /* 0x00 - 0x03 EEPROM Tag 'CCID' */
484 		u8 major;         /* 0x04        Board revision, major */
485 		u8 minor;         /* 0x05        Board revision, minor */
486 	} be;
487 
488 	i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, 0, CONFIG_SYS_I2C_EEPROM_ADDR_LEN,
489 		(void *)&be, sizeof(be));
490 
491 	if (be.id != (('C' << 24) | ('C' << 16) | ('I' << 8) | 'D'))
492 		return MPC85XX_CPU_BOARD_REV(0, 0);
493 
494 	if ((be.major == 0xff) && (be.minor == 0xff))
495 		return MPC85XX_CPU_BOARD_REV(0, 0);
496 
497 	return MPC85XX_CPU_BOARD_REV(be.major, be.minor);
498 }
499 #endif
500