board/keymile/common/ivm.c

   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 <hush.h>
  10 #include <i2c.h>
  11 #include "common.h"
  12
  13 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 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 }