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 #define MAC_STR_SZ 20 14 15 static int ivm_calc_crc(unsigned char *buf, int len) 16 { 17 const unsigned short crc_tab[16] = { 18 0x0000, 0xCC01, 0xD801, 0x1400, 19 0xF001, 0x3C00, 0x2800, 0xE401, 20 0xA001, 0x6C00, 0x7800, 0xB401, 21 0x5000, 0x9C01, 0x8801, 0x4400}; 22 23 unsigned short crc = 0; /* final result */ 24 unsigned short r1 = 0; /* temp */ 25 unsigned char byte = 0; /* input buffer */ 26 int i; 27 28 /* calculate CRC from array data */ 29 for (i = 0; i < len; i++) { 30 byte = buf[i]; 31 32 /* lower 4 bits */ 33 r1 = crc_tab[crc & 0xF]; 34 crc = ((crc) >> 4) & 0x0FFF; 35 crc = crc ^ r1 ^ crc_tab[byte & 0xF]; 36 37 /* upper 4 bits */ 38 r1 = crc_tab[crc & 0xF]; 39 crc = (crc >> 4) & 0x0FFF; 40 crc = crc ^ r1 ^ crc_tab[(byte >> 4) & 0xF]; 41 } 42 return crc; 43 } 44 45 static int ivm_set_value(char *name, char *value) 46 { 47 char tempbuf[256]; 48 49 if (value != NULL) { 50 sprintf(tempbuf, "%s=%s", name, value); 51 return set_local_var(tempbuf, 0); 52 } else { 53 unset_local_var(name); 54 } 55 return 0; 56 } 57 58 static int ivm_get_value(unsigned char *buf, int len, char *name, int off, 59 int check) 60 { 61 unsigned short val; 62 unsigned char valbuf[30]; 63 64 if ((buf[off + 0] != buf[off + 2]) && 65 (buf[off + 2] != buf[off + 4])) { 66 printf("%s Error corrupted %s\n", __func__, name); 67 val = -1; 68 } else { 69 val = buf[off + 0] + (buf[off + 1] << 8); 70 if ((val == 0) && (check == 1)) 71 val = -1; 72 } 73 sprintf((char *)valbuf, "%x", val); 74 ivm_set_value(name, (char *)valbuf); 75 return val; 76 } 77 78 #define INV_BLOCKSIZE 0x100 79 #define INV_DATAADDRESS 0x21 80 #define INVENTORYDATASIZE (INV_BLOCKSIZE - INV_DATAADDRESS - 3) 81 82 #define IVM_POS_SHORT_TEXT 0 83 #define IVM_POS_MANU_ID 1 84 #define IVM_POS_MANU_SERIAL 2 85 #define IVM_POS_PART_NUMBER 3 86 #define IVM_POS_BUILD_STATE 4 87 #define IVM_POS_SUPPLIER_PART_NUMBER 5 88 #define IVM_POS_DELIVERY_DATE 6 89 #define IVM_POS_SUPPLIER_BUILD_STATE 7 90 #define IVM_POS_CUSTOMER_ID 8 91 #define IVM_POS_CUSTOMER_PROD_ID 9 92 #define IVM_POS_HISTORY 10 93 #define IVM_POS_SYMBOL_ONLY 11 94 95 static char convert_char(char c) 96 { 97 return (c < ' ' || c > '~') ? '.' : c; 98 } 99 100 static int ivm_findinventorystring(int type, 101 unsigned char *const string, 102 unsigned long maxlen, 103 unsigned char *buf) 104 { 105 int xcode = 0; 106 unsigned long cr = 0; 107 unsigned long addr = INV_DATAADDRESS; 108 unsigned long size = 0; 109 unsigned long nr = type; 110 int stop = 0; /* stop on semicolon */ 111 112 memset(string, '\0', maxlen); 113 switch (type) { 114 case IVM_POS_SYMBOL_ONLY: 115 nr = 0; 116 stop = 1; 117 break; 118 default: 119 nr = type; 120 stop = 0; 121 } 122 123 /* Look for the requested number of CR. */ 124 while ((cr != nr) && (addr < INVENTORYDATASIZE)) { 125 if (buf[addr] == '\r') 126 cr++; 127 addr++; 128 } 129 130 /* 131 * the expected number of CR was found until the end of the IVM 132 * content --> fill string 133 */ 134 if (addr < INVENTORYDATASIZE) { 135 /* Copy the IVM string in the corresponding string */ 136 for (; (buf[addr] != '\r') && 137 ((buf[addr] != ';') || (!stop)) && 138 (size < (maxlen - 1) && 139 (addr < INVENTORYDATASIZE)); addr++) { 140 size += sprintf((char *)string + size, "%c", 141 convert_char (buf[addr])); 142 } 143 144 /* 145 * copy phase is done: check if everything is ok. If not, 146 * the inventory data is most probably corrupted: tell 147 * the world there is a problem! 148 */ 149 if (addr == INVENTORYDATASIZE) { 150 xcode = -1; 151 printf("Error end of string not found\n"); 152 } else if ((size > (maxlen - 1)) && 153 (buf[addr] != '\r')) { 154 xcode = -1; 155 printf("string too long till next CR\n"); 156 } 157 } else { 158 /* 159 * some CR are missing... 160 * the inventory data is most probably corrupted 161 */ 162 xcode = -1; 163 printf("not enough cr found\n"); 164 } 165 return xcode; 166 } 167 168 #define GET_STRING(name, which, len) \ 169 if (ivm_findinventorystring(which, valbuf, len, buf) == 0) { \ 170 ivm_set_value(name, (char *)valbuf); \ 171 } 172 173 static int ivm_check_crc(unsigned char *buf, int block) 174 { 175 unsigned long crc; 176 unsigned long crceeprom; 177 178 crc = ivm_calc_crc(buf, CONFIG_SYS_IVM_EEPROM_PAGE_LEN - 2); 179 crceeprom = (buf[CONFIG_SYS_IVM_EEPROM_PAGE_LEN - 1] + \ 180 buf[CONFIG_SYS_IVM_EEPROM_PAGE_LEN - 2] * 256); 181 if (crc != crceeprom) { 182 if (block == 0) 183 printf("Error CRC Block: %d EEprom: calculated: \ 184 %lx EEprom: %lx\n", block, crc, crceeprom); 185 return -1; 186 } 187 return 0; 188 } 189 190 /* take care of the possible MAC address offset and the IVM content offset */ 191 static int process_mac(unsigned char *valbuf, unsigned char *buf, 192 int offset) 193 { 194 unsigned char mac[6]; 195 unsigned long val = (buf[4] << 16) + (buf[5] << 8) + buf[6]; 196 197 /* use an intermediate buffer, to not change IVM content 198 * MAC address is at offset 1 199 */ 200 memcpy(mac, buf+1, 6); 201 202 if (offset) { 203 val += offset; 204 mac[3] = (val >> 16) & 0xff; 205 mac[4] = (val >> 8) & 0xff; 206 mac[5] = val & 0xff; 207 } 208 209 sprintf((char *)valbuf, "%pM", mac); 210 return 0; 211 } 212 213 static int ivm_analyze_block2(unsigned char *buf, int len) 214 { 215 unsigned char valbuf[MAC_STR_SZ]; 216 unsigned long count; 217 218 /* IVM_MAC Adress begins at offset 1 */ 219 sprintf((char *)valbuf, "%pM", buf + 1); 220 ivm_set_value("IVM_MacAddress", (char *)valbuf); 221 /* IVM_MacCount */ 222 count = (buf[10] << 24) + 223 (buf[11] << 16) + 224 (buf[12] << 8) + 225 buf[13]; 226 if (count == 0xffffffff) 227 count = 1; 228 sprintf((char *)valbuf, "%lx", count); 229 ivm_set_value("IVM_MacCount", (char *)valbuf); 230 return 0; 231 } 232 233 int ivm_analyze_eeprom(unsigned char *buf, int len) 234 { 235 unsigned short val; 236 unsigned char valbuf[CONFIG_SYS_IVM_EEPROM_PAGE_LEN]; 237 unsigned char *tmp; 238 239 if (ivm_check_crc(buf, 0) != 0) 240 return -1; 241 242 ivm_get_value(buf, CONFIG_SYS_IVM_EEPROM_PAGE_LEN, 243 "IVM_BoardId", 0, 1); 244 val = ivm_get_value(buf, CONFIG_SYS_IVM_EEPROM_PAGE_LEN, 245 "IVM_HWKey", 6, 1); 246 if (val != 0xffff) { 247 sprintf((char *)valbuf, "%x", ((val / 100) % 10)); 248 ivm_set_value("IVM_HWVariant", (char *)valbuf); 249 sprintf((char *)valbuf, "%x", (val % 100)); 250 ivm_set_value("IVM_HWVersion", (char *)valbuf); 251 } 252 ivm_get_value(buf, CONFIG_SYS_IVM_EEPROM_PAGE_LEN, 253 "IVM_Functions", 12, 0); 254 255 GET_STRING("IVM_Symbol", IVM_POS_SYMBOL_ONLY, 8) 256 GET_STRING("IVM_DeviceName", IVM_POS_SHORT_TEXT, 64) 257 tmp = (unsigned char *) getenv("IVM_DeviceName"); 258 if (tmp) { 259 int len = strlen((char *)tmp); 260 int i = 0; 261 262 while (i < len) { 263 if (tmp[i] == ';') { 264 ivm_set_value("IVM_ShortText", 265 (char *)&tmp[i + 1]); 266 break; 267 } 268 i++; 269 } 270 if (i >= len) 271 ivm_set_value("IVM_ShortText", NULL); 272 } else { 273 ivm_set_value("IVM_ShortText", NULL); 274 } 275 GET_STRING("IVM_ManufacturerID", IVM_POS_MANU_ID, 32) 276 GET_STRING("IVM_ManufacturerSerialNumber", IVM_POS_MANU_SERIAL, 20) 277 GET_STRING("IVM_ManufacturerPartNumber", IVM_POS_PART_NUMBER, 32) 278 GET_STRING("IVM_ManufacturerBuildState", IVM_POS_BUILD_STATE, 32) 279 GET_STRING("IVM_SupplierPartNumber", IVM_POS_SUPPLIER_PART_NUMBER, 32) 280 GET_STRING("IVM_DelieveryDate", IVM_POS_DELIVERY_DATE, 32) 281 GET_STRING("IVM_SupplierBuildState", IVM_POS_SUPPLIER_BUILD_STATE, 32) 282 GET_STRING("IVM_CustomerID", IVM_POS_CUSTOMER_ID, 32) 283 GET_STRING("IVM_CustomerProductID", IVM_POS_CUSTOMER_PROD_ID, 32) 284 285 if (ivm_check_crc(&buf[CONFIG_SYS_IVM_EEPROM_PAGE_LEN * 2], 2) != 0) 286 return 0; 287 ivm_analyze_block2(&buf[CONFIG_SYS_IVM_EEPROM_PAGE_LEN * 2], 288 CONFIG_SYS_IVM_EEPROM_PAGE_LEN); 289 290 return 0; 291 } 292 293 static int ivm_populate_env(unsigned char *buf, int len) 294 { 295 unsigned char *page2; 296 unsigned char valbuf[MAC_STR_SZ]; 297 298 /* do we have the page 2 filled ? if not return */ 299 if (ivm_check_crc(buf, 2)) 300 return 0; 301 page2 = &buf[CONFIG_SYS_IVM_EEPROM_PAGE_LEN*2]; 302 303 /* if an offset is defined, add it */ 304 process_mac(valbuf, page2, CONFIG_PIGGY_MAC_ADRESS_OFFSET); 305 if (getenv("ethaddr") == NULL) 306 setenv((char *)"ethaddr", (char *)valbuf); 307 #ifdef CONFIG_KMVECT1 308 /* KMVECT1 has two ethernet interfaces */ 309 if (getenv("eth1addr") == NULL) { 310 process_mac(valbuf, page2, 1); 311 setenv((char *)"eth1addr", (char *)valbuf); 312 } 313 #endif 314 315 return 0; 316 } 317 318 int ivm_read_eeprom(unsigned char *buf, int len) 319 { 320 int ret; 321 322 i2c_set_bus_num(CONFIG_KM_IVM_BUS); 323 /* add deblocking here */ 324 i2c_make_abort(); 325 326 ret = i2c_read(CONFIG_SYS_IVM_EEPROM_ADR, 0, 1, buf, len); 327 if (ret != 0) { 328 printf("Error reading EEprom\n"); 329 return -2; 330 } 331 332 return ivm_populate_env(buf, len); 333 } 334