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 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 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 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 94 static char convert_char(char c) 95 { 96 return (c < ' ' || c > '~') ? '.' : c; 97 } 98 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 } 171 172 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 */ 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 } 218 219 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 } 238 239 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 } 298 299 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 } 331 332 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