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1 /*
2  * (C) Copyright 2011
3  * Holger Brunck, Keymile GmbH Hannover, holger.brunck@keymile.com
4  *
5  * SPDX-License-Identifier:     GPL-2.0+
6  */
7
8 #include <common.h>
9 #include <cli_hush.h>
10 #include <i2c.h>
11 #include "common.h"
12
13 static int ivm_calc_crc(unsigned char *buf, int len)
14 {
15         const unsigned short crc_tab[16] = {
16                 0x0000, 0xCC01, 0xD801, 0x1400,
17                 0xF001, 0x3C00, 0x2800, 0xE401,
18                 0xA001, 0x6C00, 0x7800, 0xB401,
19                 0x5000, 0x9C01, 0x8801, 0x4400};
20
21         unsigned short crc     = 0;   /* final result */
22         unsigned short r1      = 0;   /* temp */
23         unsigned char  byte    = 0;   /* input buffer */
24         int     i;
25
26         /* calculate CRC from array data */
27         for (i = 0; i < len; i++) {
28                 byte = buf[i];
29
30                 /* lower 4 bits */
31                 r1 = crc_tab[crc & 0xF];
32                 crc = ((crc) >> 4) & 0x0FFF;
33                 crc = crc ^ r1 ^ crc_tab[byte & 0xF];
34
35                 /* upper 4 bits */
36                 r1 = crc_tab[crc & 0xF];
37                 crc = (crc >> 4) & 0x0FFF;
38                 crc = crc ^ r1 ^ crc_tab[(byte >> 4) & 0xF];
39         }
40         return crc;
41 }
42
43 static int ivm_set_value(char *name, char *value)
44 {
45         char tempbuf[256];
46
47         if (value != NULL) {
48                 sprintf(tempbuf, "%s=%s", name, value);
49                 return set_local_var(tempbuf, 0);
50         } else {
51                 unset_local_var(name);
52         }
53         return 0;
54 }
55
56 static int ivm_get_value(unsigned char *buf, int len, char *name, int off,
57                                 int check)
58 {
59         unsigned short  val;
60         unsigned char   valbuf[30];
61
62         if ((buf[off + 0] != buf[off + 2]) &&
63             (buf[off + 2] != buf[off + 4])) {
64                 printf("%s Error corrupted %s\n", __func__, name);
65                 val = -1;
66         } else {
67                 val = buf[off + 0] + (buf[off + 1] << 8);
68                 if ((val == 0) && (check == 1))
69                         val = -1;
70         }
71         sprintf((char *)valbuf, "%x", val);
72         ivm_set_value(name, (char *)valbuf);
73         return val;
74 }
75
76 #define INV_BLOCKSIZE           0x100
77 #define INV_DATAADDRESS         0x21
78 #define INVENTORYDATASIZE       (INV_BLOCKSIZE - INV_DATAADDRESS - 3)
79
80 #define IVM_POS_SHORT_TEXT              0
81 #define IVM_POS_MANU_ID                 1
82 #define IVM_POS_MANU_SERIAL             2
83 #define IVM_POS_PART_NUMBER             3
84 #define IVM_POS_BUILD_STATE             4
85 #define IVM_POS_SUPPLIER_PART_NUMBER    5
86 #define IVM_POS_DELIVERY_DATE           6
87 #define IVM_POS_SUPPLIER_BUILD_STATE    7
88 #define IVM_POS_CUSTOMER_ID             8
89 #define IVM_POS_CUSTOMER_PROD_ID        9
90 #define IVM_POS_HISTORY                 10
91 #define IVM_POS_SYMBOL_ONLY             11
92
93 static char convert_char(char c)
94 {
95         return (c < ' ' || c > '~') ? '.' : c;
96 }
97
98 static int ivm_findinventorystring(int type,
99                                         unsigned char *const string,
100                                         unsigned long maxlen,
101                                         unsigned char *buf)
102 {
103         int xcode = 0;
104         unsigned long cr = 0;
105         unsigned long addr = INV_DATAADDRESS;
106         unsigned long size = 0;
107         unsigned long nr = type;
108         int stop = 0;   /* stop on semicolon */
109
110         memset(string, '\0', maxlen);
111         switch (type) {
112         case IVM_POS_SYMBOL_ONLY:
113                 nr = 0;
114                 stop = 1;
115         break;
116         default:
117                 nr = type;
118                 stop = 0;
119         }
120
121         /* Look for the requested number of CR. */
122         while ((cr != nr) && (addr < INVENTORYDATASIZE)) {
123                 if (buf[addr] == '\r')
124                         cr++;
125                 addr++;
126         }
127
128         /*
129          * the expected number of CR was found until the end of the IVM
130          *  content --> fill string
131          */
132         if (addr < INVENTORYDATASIZE) {
133                 /* Copy the IVM string in the corresponding string */
134                 for (; (buf[addr] != '\r')                      &&
135                         ((buf[addr] != ';') ||  (!stop))        &&
136                         (size < (maxlen - 1)                    &&
137                         (addr < INVENTORYDATASIZE)); addr++) {
138                         size += sprintf((char *)string + size, "%c",
139                                                 convert_char (buf[addr]));
140                 }
141
142                 /*
143                  * copy phase is done: check if everything is ok. If not,
144                  * the inventory data is most probably corrupted: tell
145                  * the world there is a problem!
146                  */
147                 if (addr == INVENTORYDATASIZE) {
148                         xcode = -1;
149                         printf("Error end of string not found\n");
150                 } else if ((size > (maxlen - 1)) &&
151                            (buf[addr] != '\r')) {
152                         xcode = -1;
153                         printf("string too long till next CR\n");
154                 }
155         } else {
156                 /*
157                  * some CR are missing...
158                  * the inventory data is most probably corrupted
159                  */
160                 xcode = -1;
161                 printf("not enough cr found\n");
162         }
163         return xcode;
164 }
165
166 #define GET_STRING(name, which, len) \
167         if (ivm_findinventorystring(which, valbuf, len, buf) == 0) { \
168                 ivm_set_value(name, (char *)valbuf); \
169         }
170
171 static int ivm_check_crc(unsigned char *buf, int block)
172 {
173         unsigned long   crc;
174         unsigned long   crceeprom;
175
176         crc = ivm_calc_crc(buf, CONFIG_SYS_IVM_EEPROM_PAGE_LEN - 2);
177         crceeprom = (buf[CONFIG_SYS_IVM_EEPROM_PAGE_LEN - 1] + \
178                         buf[CONFIG_SYS_IVM_EEPROM_PAGE_LEN - 2] * 256);
179         if (crc != crceeprom) {
180                 if (block == 0)
181                         printf("Error CRC Block: %d EEprom: calculated: \
182                         %lx EEprom: %lx\n", block, crc, crceeprom);
183                 return -1;
184         }
185         return 0;
186 }
187
188 static int calculate_mac_offset(unsigned char *valbuf, unsigned char *buf,
189                                 int offset)
190 {
191         unsigned long val = (buf[4] << 16) + (buf[5] << 8) + buf[6];
192
193         if (offset == 0)
194                 return 0;
195
196         val += offset;
197         buf[4] = (val >> 16) & 0xff;
198         buf[5] = (val >> 8) & 0xff;
199         buf[6] = val & 0xff;
200         sprintf((char *)valbuf, "%pM", buf + 1);
201         return 0;
202 }
203
204 static int ivm_analyze_block2(unsigned char *buf, int len)
205 {
206         unsigned char   valbuf[CONFIG_SYS_IVM_EEPROM_PAGE_LEN];
207         unsigned long   count;
208
209         /* IVM_MAC Adress begins at offset 1 */
210         sprintf((char *)valbuf, "%pM", buf + 1);
211         ivm_set_value("IVM_MacAddress", (char *)valbuf);
212         /* if an offset is defined, add it */
213         calculate_mac_offset(buf, valbuf, CONFIG_PIGGY_MAC_ADRESS_OFFSET);
214 #ifdef MACH_TYPE_KM_KIRKWOOD
215         setenv((char *)"ethaddr", (char *)valbuf);
216 #else
217         if (getenv("ethaddr") == NULL)
218                 setenv((char *)"ethaddr", (char *)valbuf);
219 #endif
220 #ifdef CONFIG_KMVECT1
221 /* KMVECT1 has two ethernet interfaces */
222         if (getenv("eth1addr") == NULL) {
223                 calculate_mac_offset(buf, valbuf, 1);
224                 setenv((char *)"eth1addr", (char *)valbuf);
225         }
226 #endif
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
239 static 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 *) getenv("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
299 int ivm_read_eeprom(void)
300 {
301         uchar i2c_buffer[CONFIG_SYS_IVM_EEPROM_MAX_LEN];
302         int ret;
303
304         i2c_set_bus_num(CONFIG_KM_IVM_BUS);
305         /* add deblocking here */
306         i2c_make_abort();
307
308         ret = i2c_read(CONFIG_SYS_IVM_EEPROM_ADR, 0, 1, i2c_buffer,
309                 CONFIG_SYS_IVM_EEPROM_MAX_LEN);
310         if (ret != 0) {
311                 printf("Error reading EEprom\n");
312                 return -2;
313         }
314
315         return ivm_analyze_eeprom(i2c_buffer, CONFIG_SYS_IVM_EEPROM_MAX_LEN);
316 }