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1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * (C) Copyright 2011
4  * Holger Brunck, Keymile GmbH Hannover, holger.brunck@keymile.com
5  */
6 
7 #include <common.h>
8 #include <cli_hush.h>
9 #include <i2c.h>
10 #include "common.h"
11 
12 #define MAC_STR_SZ	20
13 
ivm_calc_crc(unsigned char * buf,int len)14 static int ivm_calc_crc(unsigned char *buf, int len)
15 {
16 	const unsigned short crc_tab[16] = {
17 		0x0000, 0xCC01, 0xD801, 0x1400,
18 		0xF001, 0x3C00, 0x2800, 0xE401,
19 		0xA001, 0x6C00, 0x7800, 0xB401,
20 		0x5000, 0x9C01, 0x8801, 0x4400};
21 
22 	unsigned short crc     = 0;   /* final result */
23 	unsigned short r1      = 0;   /* temp */
24 	unsigned char  byte    = 0;   /* input buffer */
25 	int	i;
26 
27 	/* calculate CRC from array data */
28 	for (i = 0; i < len; i++) {
29 		byte = buf[i];
30 
31 		/* lower 4 bits */
32 		r1 = crc_tab[crc & 0xF];
33 		crc = ((crc) >> 4) & 0x0FFF;
34 		crc = crc ^ r1 ^ crc_tab[byte & 0xF];
35 
36 		/* upper 4 bits */
37 		r1 = crc_tab[crc & 0xF];
38 		crc = (crc >> 4) & 0x0FFF;
39 		crc = crc ^ r1 ^ crc_tab[(byte >> 4) & 0xF];
40 	}
41 	return crc;
42 }
43 
ivm_set_value(char * name,char * value)44 static int ivm_set_value(char *name, char *value)
45 {
46 	char tempbuf[256];
47 
48 	if (value != NULL) {
49 		sprintf(tempbuf, "%s=%s", name, value);
50 		return set_local_var(tempbuf, 0);
51 	} else {
52 		unset_local_var(name);
53 	}
54 	return 0;
55 }
56 
ivm_get_value(unsigned char * buf,int len,char * name,int off,int check)57 static int ivm_get_value(unsigned char *buf, int len, char *name, int off,
58 				int check)
59 {
60 	unsigned short	val;
61 	unsigned char	valbuf[30];
62 
63 	if ((buf[off + 0] != buf[off + 2]) &&
64 	    (buf[off + 2] != buf[off + 4])) {
65 		printf("%s Error corrupted %s\n", __func__, name);
66 		val = -1;
67 	} else {
68 		val = buf[off + 0] + (buf[off + 1] << 8);
69 		if ((val == 0) && (check == 1))
70 			val = -1;
71 	}
72 	sprintf((char *)valbuf, "%x", val);
73 	ivm_set_value(name, (char *)valbuf);
74 	return val;
75 }
76 
77 #define INV_BLOCKSIZE		0x100
78 #define INV_DATAADDRESS		0x21
79 #define INVENTORYDATASIZE	(INV_BLOCKSIZE - INV_DATAADDRESS - 3)
80 
81 #define IVM_POS_SHORT_TEXT		0
82 #define IVM_POS_MANU_ID			1
83 #define IVM_POS_MANU_SERIAL		2
84 #define IVM_POS_PART_NUMBER		3
85 #define IVM_POS_BUILD_STATE		4
86 #define IVM_POS_SUPPLIER_PART_NUMBER	5
87 #define IVM_POS_DELIVERY_DATE		6
88 #define IVM_POS_SUPPLIER_BUILD_STATE	7
89 #define IVM_POS_CUSTOMER_ID		8
90 #define IVM_POS_CUSTOMER_PROD_ID	9
91 #define IVM_POS_HISTORY			10
92 #define IVM_POS_SYMBOL_ONLY		11
93 
convert_char(char c)94 static char convert_char(char c)
95 {
96 	return (c < ' ' || c > '~') ? '.' : c;
97 }
98 
ivm_findinventorystring(int type,unsigned char * const string,unsigned long maxlen,unsigned char * buf)99 static int ivm_findinventorystring(int type,
100 					unsigned char *const string,
101 					unsigned long maxlen,
102 					unsigned char *buf)
103 {
104 	int xcode = 0;
105 	unsigned long cr = 0;
106 	unsigned long addr = INV_DATAADDRESS;
107 	unsigned long size = 0;
108 	unsigned long nr = type;
109 	int stop = 0;	/* stop on semicolon */
110 
111 	memset(string, '\0', maxlen);
112 	switch (type) {
113 	case IVM_POS_SYMBOL_ONLY:
114 		nr = 0;
115 		stop = 1;
116 	break;
117 	default:
118 		nr = type;
119 		stop = 0;
120 	}
121 
122 	/* Look for the requested number of CR. */
123 	while ((cr != nr) && (addr < INVENTORYDATASIZE)) {
124 		if (buf[addr] == '\r')
125 			cr++;
126 		addr++;
127 	}
128 
129 	/*
130 	 * the expected number of CR was found until the end of the IVM
131 	 *  content --> fill string
132 	 */
133 	if (addr < INVENTORYDATASIZE) {
134 		/* Copy the IVM string in the corresponding string */
135 		for (; (buf[addr] != '\r')			&&
136 			((buf[addr] != ';') ||  (!stop))	&&
137 			(size < (maxlen - 1)			&&
138 			(addr < INVENTORYDATASIZE)); addr++) {
139 			size += sprintf((char *)string + size, "%c",
140 						convert_char (buf[addr]));
141 		}
142 
143 		/*
144 		 * copy phase is done: check if everything is ok. If not,
145 		 * the inventory data is most probably corrupted: tell
146 		 * the world there is a problem!
147 		 */
148 		if (addr == INVENTORYDATASIZE) {
149 			xcode = -1;
150 			printf("Error end of string not found\n");
151 		} else if ((size > (maxlen - 1)) &&
152 			   (buf[addr] != '\r')) {
153 			xcode = -1;
154 			printf("string too long till next CR\n");
155 		}
156 	} else {
157 		/*
158 		 * some CR are missing...
159 		 * the inventory data is most probably corrupted
160 		 */
161 		xcode = -1;
162 		printf("not enough cr found\n");
163 	}
164 	return xcode;
165 }
166 
167 #define GET_STRING(name, which, len) \
168 	if (ivm_findinventorystring(which, valbuf, len, buf) == 0) { \
169 		ivm_set_value(name, (char *)valbuf); \
170 	}
171 
ivm_check_crc(unsigned char * buf,int block)172 static int ivm_check_crc(unsigned char *buf, int block)
173 {
174 	unsigned long	crc;
175 	unsigned long	crceeprom;
176 
177 	crc = ivm_calc_crc(buf, CONFIG_SYS_IVM_EEPROM_PAGE_LEN - 2);
178 	crceeprom = (buf[CONFIG_SYS_IVM_EEPROM_PAGE_LEN - 1] + \
179 			buf[CONFIG_SYS_IVM_EEPROM_PAGE_LEN - 2] * 256);
180 	if (crc != crceeprom) {
181 		if (block == 0)
182 			printf("Error CRC Block: %d EEprom: calculated: \
183 			%lx EEprom: %lx\n", block, crc, crceeprom);
184 		return -1;
185 	}
186 	return 0;
187 }
188 
189 /* take care of the possible MAC address offset and the IVM content offset */
process_mac(unsigned char * valbuf,unsigned char * buf,int offset,bool unique)190 static int process_mac(unsigned char *valbuf, unsigned char *buf,
191 				int offset, bool unique)
192 {
193 	unsigned char mac[6];
194 	unsigned long val = (buf[4] << 16) + (buf[5] << 8) + buf[6];
195 
196 	/* use an intermediate buffer, to not change IVM content
197 	 * MAC address is at offset 1
198 	 */
199 	memcpy(mac, buf+1, 6);
200 
201 	/* MAC adress can be set to locally administred, this is only allowed
202 	 * for interfaces which have now connection to the outside. For these
203 	 * addresses we need to set the second bit in the first byte.
204 	 */
205 	if (!unique)
206 		mac[0] |= 0x2;
207 
208 	if (offset) {
209 		val += offset;
210 		mac[3] = (val >> 16) & 0xff;
211 		mac[4] = (val >> 8) & 0xff;
212 		mac[5] = val & 0xff;
213 	}
214 
215 	sprintf((char *)valbuf, "%pM", mac);
216 	return 0;
217 }
218 
ivm_analyze_block2(unsigned char * buf,int len)219 static int ivm_analyze_block2(unsigned char *buf, int len)
220 {
221 	unsigned char	valbuf[MAC_STR_SZ];
222 	unsigned long	count;
223 
224 	/* IVM_MAC Adress begins at offset 1 */
225 	sprintf((char *)valbuf, "%pM", buf + 1);
226 	ivm_set_value("IVM_MacAddress", (char *)valbuf);
227 	/* IVM_MacCount */
228 	count = (buf[10] << 24) +
229 		   (buf[11] << 16) +
230 		   (buf[12] << 8)  +
231 		    buf[13];
232 	if (count == 0xffffffff)
233 		count = 1;
234 	sprintf((char *)valbuf, "%lx", count);
235 	ivm_set_value("IVM_MacCount", (char *)valbuf);
236 	return 0;
237 }
238 
ivm_analyze_eeprom(unsigned char * buf,int len)239 int ivm_analyze_eeprom(unsigned char *buf, int len)
240 {
241 	unsigned short	val;
242 	unsigned char	valbuf[CONFIG_SYS_IVM_EEPROM_PAGE_LEN];
243 	unsigned char	*tmp;
244 
245 	if (ivm_check_crc(buf, 0) != 0)
246 		return -1;
247 
248 	ivm_get_value(buf, CONFIG_SYS_IVM_EEPROM_PAGE_LEN,
249 			"IVM_BoardId", 0, 1);
250 	val = ivm_get_value(buf, CONFIG_SYS_IVM_EEPROM_PAGE_LEN,
251 			"IVM_HWKey", 6, 1);
252 	if (val != 0xffff) {
253 		sprintf((char *)valbuf, "%x", ((val / 100) % 10));
254 		ivm_set_value("IVM_HWVariant", (char *)valbuf);
255 		sprintf((char *)valbuf, "%x", (val % 100));
256 		ivm_set_value("IVM_HWVersion", (char *)valbuf);
257 	}
258 	ivm_get_value(buf, CONFIG_SYS_IVM_EEPROM_PAGE_LEN,
259 		"IVM_Functions", 12, 0);
260 
261 	GET_STRING("IVM_Symbol", IVM_POS_SYMBOL_ONLY, 8)
262 	GET_STRING("IVM_DeviceName", IVM_POS_SHORT_TEXT, 64)
263 	tmp = (unsigned char *)env_get("IVM_DeviceName");
264 	if (tmp) {
265 		int	len = strlen((char *)tmp);
266 		int	i = 0;
267 
268 		while (i < len) {
269 			if (tmp[i] == ';') {
270 				ivm_set_value("IVM_ShortText",
271 					(char *)&tmp[i + 1]);
272 				break;
273 			}
274 			i++;
275 		}
276 		if (i >= len)
277 			ivm_set_value("IVM_ShortText", NULL);
278 	} else {
279 		ivm_set_value("IVM_ShortText", NULL);
280 	}
281 	GET_STRING("IVM_ManufacturerID", IVM_POS_MANU_ID, 32)
282 	GET_STRING("IVM_ManufacturerSerialNumber", IVM_POS_MANU_SERIAL, 20)
283 	GET_STRING("IVM_ManufacturerPartNumber", IVM_POS_PART_NUMBER, 32)
284 	GET_STRING("IVM_ManufacturerBuildState", IVM_POS_BUILD_STATE, 32)
285 	GET_STRING("IVM_SupplierPartNumber", IVM_POS_SUPPLIER_PART_NUMBER, 32)
286 	GET_STRING("IVM_DelieveryDate", IVM_POS_DELIVERY_DATE, 32)
287 	GET_STRING("IVM_SupplierBuildState", IVM_POS_SUPPLIER_BUILD_STATE, 32)
288 	GET_STRING("IVM_CustomerID", IVM_POS_CUSTOMER_ID, 32)
289 	GET_STRING("IVM_CustomerProductID", IVM_POS_CUSTOMER_PROD_ID, 32)
290 
291 	if (ivm_check_crc(&buf[CONFIG_SYS_IVM_EEPROM_PAGE_LEN * 2], 2) != 0)
292 		return 0;
293 	ivm_analyze_block2(&buf[CONFIG_SYS_IVM_EEPROM_PAGE_LEN * 2],
294 		CONFIG_SYS_IVM_EEPROM_PAGE_LEN);
295 
296 	return 0;
297 }
298 
ivm_populate_env(unsigned char * buf,int len)299 static int ivm_populate_env(unsigned char *buf, int len)
300 {
301 	unsigned char	*page2;
302 	unsigned char	valbuf[MAC_STR_SZ];
303 
304 	/* do we have the page 2 filled ? if not return */
305 	if (ivm_check_crc(buf, 2))
306 		return 0;
307 	page2 = &buf[CONFIG_SYS_IVM_EEPROM_PAGE_LEN*2];
308 
309 #ifndef CONFIG_KMTEGR1
310 	/* if an offset is defined, add it */
311 	process_mac(valbuf, page2, CONFIG_PIGGY_MAC_ADRESS_OFFSET, true);
312 	env_set((char *)"ethaddr", (char *)valbuf);
313 #ifdef CONFIG_KMVECT1
314 /* KMVECT1 has two ethernet interfaces */
315 	process_mac(valbuf, page2, 1, true);
316 	env_set((char *)"eth1addr", (char *)valbuf);
317 #endif
318 #else
319 /* KMTEGR1 has a special setup. eth0 has no connection to the outside and
320  * gets an locally administred MAC address, eth1 is the debug interface and
321  * gets the official MAC address from the IVM
322  */
323 	process_mac(valbuf, page2, CONFIG_PIGGY_MAC_ADRESS_OFFSET, false);
324 	env_set((char *)"ethaddr", (char *)valbuf);
325 	process_mac(valbuf, page2, CONFIG_PIGGY_MAC_ADRESS_OFFSET, true);
326 	env_set((char *)"eth1addr", (char *)valbuf);
327 #endif
328 
329 	return 0;
330 }
331 
ivm_read_eeprom(unsigned char * buf,int len)332 int ivm_read_eeprom(unsigned char *buf, int len)
333 {
334 	int ret;
335 
336 	i2c_set_bus_num(CONFIG_KM_IVM_BUS);
337 	/* add deblocking here */
338 	i2c_make_abort();
339 
340 	ret = i2c_read(CONFIG_SYS_IVM_EEPROM_ADR, 0, 1, buf, len);
341 	if (ret != 0) {
342 		printf("Error reading EEprom\n");
343 		return -2;
344 	}
345 
346 	return ivm_populate_env(buf, len);
347 }
348