board/keymile/common/ivm.c

   1 /*
   2  * (C) Copyright 2011
   3  * Holger Brunck, Keymile GmbH Hannover, holger.brunck@keymile.com
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 #include <common.h>
  25 #include <hush.h>
  26 #include <i2c.h>
  27 #include "common.h"
  28
  29 int ivm_calc_crc(unsigned char *buf, int len)
  30 {
  31         const unsigned short crc_tab[16] = {
  32                 0x0000, 0xCC01, 0xD801, 0x1400,
  33                 0xF001, 0x3C00, 0x2800, 0xE401,
  34                 0xA001, 0x6C00, 0x7800, 0xB401,
  35                 0x5000, 0x9C01, 0x8801, 0x4400};
  36
  37         unsigned short crc     = 0;   /* final result */
  38         unsigned short r1      = 0;   /* temp */
  39         unsigned char  byte    = 0;   /* input buffer */
  40         int     i;
  41
  42         /* calculate CRC from array data */
  43         for (i = 0; i < len; i++) {
  44                 byte = buf[i];
  45
  46                 /* lower 4 bits */
  47                 r1 = crc_tab[crc & 0xF];
  48                 crc = ((crc) >> 4) & 0x0FFF;
  49                 crc = crc ^ r1 ^ crc_tab[byte & 0xF];
  50
  51                 /* upper 4 bits */
  52                 r1 = crc_tab[crc & 0xF];
  53                 crc = (crc >> 4) & 0x0FFF;
  54                 crc = crc ^ r1 ^ crc_tab[(byte >> 4) & 0xF];
  55         }
  56         return crc;
  57 }
  58
  59 static int ivm_set_value(char *name, char *value)
  60 {
  61         char tempbuf[256];
  62
  63         if (value != NULL) {
  64                 sprintf(tempbuf, "%s=%s", name, value);
  65                 return set_local_var(tempbuf, 0);
  66         } else {
  67                 unset_local_var(name);
  68         }
  69         return 0;
  70 }
  71
  72 static int ivm_get_value(unsigned char *buf, int len, char *name, int off,
  73                                 int check)
  74 {
  75         unsigned short  val;
  76         unsigned char   valbuf[30];
  77
  78         if ((buf[off + 0] != buf[off + 2]) &&
  79             (buf[off + 2] != buf[off + 4])) {
  80                 printf("%s Error corrupted %s\n", __func__, name);
  81                 val = -1;
  82         } else {
  83                 val = buf[off + 0] + (buf[off + 1] << 8);
  84                 if ((val == 0) && (check == 1))
  85                         val = -1;
  86         }
  87         sprintf((char *)valbuf, "%x", val);
  88         ivm_set_value(name, (char *)valbuf);
  89         return val;
  90 }
  91
  92 #define INV_BLOCKSIZE           0x100
  93 #define INV_DATAADDRESS         0x21
  94 #define INVENTORYDATASIZE       (INV_BLOCKSIZE - INV_DATAADDRESS - 3)
  95
  96 #define IVM_POS_SHORT_TEXT              0
  97 #define IVM_POS_MANU_ID                 1
  98 #define IVM_POS_MANU_SERIAL             2
  99 #define IVM_POS_PART_NUMBER             3
 100 #define IVM_POS_BUILD_STATE             4
 101 #define IVM_POS_SUPPLIER_PART_NUMBER    5
 102 #define IVM_POS_DELIVERY_DATE           6
 103 #define IVM_POS_SUPPLIER_BUILD_STATE    7
 104 #define IVM_POS_CUSTOMER_ID             8
 105 #define IVM_POS_CUSTOMER_PROD_ID        9
 106 #define IVM_POS_HISTORY                 10
 107 #define IVM_POS_SYMBOL_ONLY             11
 108
 109 static char convert_char(char c)
 110 {
 111         return (c < ' ' || c > '~') ? '.' : c;
 112 }
 113
 114 static int ivm_findinventorystring(int type,
 115                                         unsigned char *const string,
 116                                         unsigned long maxlen,
 117                                         unsigned char *buf)
 118 {
 119         int xcode = 0;
 120         unsigned long cr = 0;
 121         unsigned long addr = INV_DATAADDRESS;
 122         unsigned long size = 0;
 123         unsigned long nr = type;
 124         int stop = 0;   /* stop on semicolon */
 125
 126         memset(string, '\0', maxlen);
 127         switch (type) {
 128         case IVM_POS_SYMBOL_ONLY:
 129                 nr = 0;
 130                 stop = 1;
 131         break;
 132         default:
 133                 nr = type;
 134                 stop = 0;
 135         }
 136
 137         /* Look for the requested number of CR. */
 138         while ((cr != nr) && (addr < INVENTORYDATASIZE)) {
 139                 if ((buf[addr] == '\r'))
 140                         cr++;
 141                 addr++;
 142         }
 143
 144         /*
 145          * the expected number of CR was found until the end of the IVM
 146          *  content --> fill string
 147          */
 148         if (addr < INVENTORYDATASIZE) {
 149                 /* Copy the IVM string in the corresponding string */
 150                 for (; (buf[addr] != '\r')                      &&
 151                         ((buf[addr] != ';') ||  (!stop))        &&
 152                         (size < (maxlen - 1)                    &&
 153                         (addr < INVENTORYDATASIZE)); addr++) {
 154                         size += sprintf((char *)string + size, "%c",
 155                                                 convert_char (buf[addr]));
 156                 }
 157
 158                 /*
 159                  * copy phase is done: check if everything is ok. If not,
 160                  * the inventory data is most probably corrupted: tell
 161                  * the world there is a problem!
 162                  */
 163                 if (addr == INVENTORYDATASIZE) {
 164                         xcode = -1;
 165                         printf("Error end of string not found\n");
 166                 } else if ((size >= (maxlen - 1)) &&
 167                            (buf[addr] != '\r')) {
 168                         xcode = -1;
 169                         printf("string too long till next CR\n");
 170                 }
 171         } else {
 172                 /*
 173                  * some CR are missing...
 174                  * the inventory data is most probably corrupted
 175                  */
 176                 xcode = -1;
 177                 printf("not enough cr found\n");
 178         }
 179         return xcode;
 180 }
 181
 182 #define GET_STRING(name, which, len) \
 183         if (ivm_findinventorystring(which, valbuf, len, buf) == 0) { \
 184                 ivm_set_value(name, (char *)valbuf); \
 185         }
 186
 187 static int ivm_check_crc(unsigned char *buf, int block)
 188 {
 189         unsigned long   crc;
 190         unsigned long   crceeprom;
 191
 192         crc = ivm_calc_crc(buf, CONFIG_SYS_IVM_EEPROM_PAGE_LEN - 2);
 193         crceeprom = (buf[CONFIG_SYS_IVM_EEPROM_PAGE_LEN - 1] + \
 194                         buf[CONFIG_SYS_IVM_EEPROM_PAGE_LEN - 2] * 256);
 195         if (crc != crceeprom) {
 196                 if (block == 0)
 197                         printf("Error CRC Block: %d EEprom: calculated: \
 198                         %lx EEprom: %lx\n", block, crc, crceeprom);
 199                 return -1;
 200         }
 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 #if defined(CONFIG_PIGGY_MAC_ADRESS_OFFSET)
 214         if (CONFIG_PIGGY_MAC_ADRESS_OFFSET > 0) {
 215                 unsigned long val = (buf[4] << 16) + (buf[5] << 8) + buf[6];
 216
 217                 val += CONFIG_PIGGY_MAC_ADRESS_OFFSET;
 218                 buf[4] = (val >> 16) & 0xff;
 219                 buf[5] = (val >> 8) & 0xff;
 220                 buf[6] = val & 0xff;
 221                 sprintf((char *)valbuf, "%pM", buf);
 222         }
 223 #endif
 224         setenv((char *)"ethaddr", (char *)valbuf);
 225
 226         /* IVM_MacCount */
 227         count = (buf[10] << 24) +
 228                    (buf[11] << 16) +
 229                    (buf[12] << 8)  +
 230                     buf[13];
 231         if (count == 0xffffffff)
 232                 count = 1;
 233         sprintf((char *)valbuf, "%lx", count);
 234         ivm_set_value("IVM_MacCount", (char *)valbuf);
 235         return 0;
 236 }
 237
 238 int ivm_analyze_eeprom(unsigned char *buf, int len)
 239 {
 240         unsigned short  val;
 241         unsigned char   valbuf[CONFIG_SYS_IVM_EEPROM_PAGE_LEN];
 242         unsigned char   *tmp;
 243
 244         if (ivm_check_crc(buf, 0) != 0)
 245                 return -1;
 246
 247         ivm_get_value(buf, CONFIG_SYS_IVM_EEPROM_PAGE_LEN,
 248                         "IVM_BoardId", 0, 1);
 249         val = ivm_get_value(buf, CONFIG_SYS_IVM_EEPROM_PAGE_LEN,
 250                         "IVM_HWKey", 6, 1);
 251         if (val != 0xffff) {
 252                 sprintf((char *)valbuf, "%x", ((val / 100) % 10));
 253                 ivm_set_value("IVM_HWVariant", (char *)valbuf);
 254                 sprintf((char *)valbuf, "%x", (val % 100));
 255                 ivm_set_value("IVM_HWVersion", (char *)valbuf);
 256         }
 257         ivm_get_value(buf, CONFIG_SYS_IVM_EEPROM_PAGE_LEN,
 258                 "IVM_Functions", 12, 0);
 259
 260         GET_STRING("IVM_Symbol", IVM_POS_SYMBOL_ONLY, 8)
 261         GET_STRING("IVM_DeviceName", IVM_POS_SHORT_TEXT, 64)
 262         tmp = (unsigned char *) getenv("IVM_DeviceName");
 263         if (tmp) {
 264                 int     len = strlen((char *)tmp);
 265                 int     i = 0;
 266
 267                 while (i < len) {
 268                         if (tmp[i] == ';') {
 269                                 ivm_set_value("IVM_ShortText",
 270                                         (char *)&tmp[i + 1]);
 271                                 break;
 272                         }
 273                         i++;
 274                 }
 275                 if (i >= len)
 276                         ivm_set_value("IVM_ShortText", NULL);
 277         } else {
 278                 ivm_set_value("IVM_ShortText", NULL);
 279         }
 280         GET_STRING("IVM_ManufacturerID", IVM_POS_MANU_ID, 32)
 281         GET_STRING("IVM_ManufacturerSerialNumber", IVM_POS_MANU_SERIAL, 20)
 282         GET_STRING("IVM_ManufacturerPartNumber", IVM_POS_PART_NUMBER, 32)
 283         GET_STRING("IVM_ManufacturerBuildState", IVM_POS_BUILD_STATE, 32)
 284         GET_STRING("IVM_SupplierPartNumber", IVM_POS_SUPPLIER_PART_NUMBER, 32)
 285         GET_STRING("IVM_DelieveryDate", IVM_POS_DELIVERY_DATE, 32)
 286         GET_STRING("IVM_SupplierBuildState", IVM_POS_SUPPLIER_BUILD_STATE, 32)
 287         GET_STRING("IVM_CustomerID", IVM_POS_CUSTOMER_ID, 32)
 288         GET_STRING("IVM_CustomerProductID", IVM_POS_CUSTOMER_PROD_ID, 32)
 289
 290         if (ivm_check_crc(&buf[CONFIG_SYS_IVM_EEPROM_PAGE_LEN * 2], 2) != 0)
 291                 return 0;
 292         ivm_analyze_block2(&buf[CONFIG_SYS_IVM_EEPROM_PAGE_LEN * 2],
 293                 CONFIG_SYS_IVM_EEPROM_PAGE_LEN);
 294
 295         return 0;
 296 }
 297
 298 int ivm_read_eeprom(void)
 299 {
 300 #if defined(CONFIG_I2C_MUX)
 301         I2C_MUX_DEVICE *dev = NULL;
 302 #endif
 303         uchar i2c_buffer[CONFIG_SYS_IVM_EEPROM_MAX_LEN];
 304         uchar   *buf;
 305         unsigned long dev_addr = CONFIG_SYS_IVM_EEPROM_ADR;
 306         int ret;
 307
 308 #if defined(CONFIG_I2C_MUX)
 309         /* First init the Bus, select the Bus */
 310 #if defined(CONFIG_SYS_I2C_IVM_BUS)
 311         dev = i2c_mux_ident_muxstring((uchar *)CONFIG_SYS_I2C_IVM_BUS);
 312 #else
 313         buf = (unsigned char *) getenv("EEprom_ivm");
 314         if (buf != NULL)
 315                 dev = i2c_mux_ident_muxstring(buf);
 316 #endif
 317         if (dev == NULL) {
 318                 printf("Error couldnt add Bus for IVM\n");
 319                 return -1;
 320         }
 321         i2c_set_bus_num(dev->busid);
 322 #endif
 323
 324         buf = (unsigned char *) getenv("EEprom_ivm_addr");
 325         if (buf != NULL) {
 326                 ret = strict_strtoul((char *)buf, 16, &dev_addr);
 327                 if (ret != 0)
 328                         return -3;
 329         }
 330
 331         /* add deblocking here */
 332         i2c_make_abort();
 333
 334         ret = i2c_read(dev_addr, 0, 1, i2c_buffer,
 335                 CONFIG_SYS_IVM_EEPROM_MAX_LEN);
 336         if (ret != 0) {
 337                 printf("Error reading EEprom\n");
 338                 return -2;
 339         }
 340
 341         return ivm_analyze_eeprom(i2c_buffer, CONFIG_SYS_IVM_EEPROM_MAX_LEN);
 342 }