board/freescale/common/sys_eeprom.c

   1 /*
   2  * Copyright 2006 Freescale Semiconductor
   3  * York Sun (yorksun@freescale.com)
   4  * Haiying Wang (haiying.wang@freescale.com)
   5  *
   6  * See file CREDITS for list of people who contributed to this
   7  * project.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation; either version 2 of
  12  * the License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  22  * MA 02111-1307 USA
  23  */
  24
  25 #include <common.h>
  26 #include <command.h>
  27 #include <i2c.h>
  28 #include <linux/ctype.h>
  29
  30 typedef struct {
  31         u8 id[4];               /* 0x0000 - 0x0003 EEPROM Tag */
  32         u8 sn[12];              /* 0x0004 - 0x000F Serial Number */
  33         u8 errata[5];           /* 0x0010 - 0x0014 Errata Level */
  34         u8 date[6];             /* 0x0015 - 0x001a Build Date */
  35         u8 res_0;               /* 0x001b          Reserved */
  36         u8 version[4];          /* 0x001c - 0x001f Version */
  37         u8 tempcal[8];          /* 0x0020 - 0x0027 Temperature Calibration Factors*/
  38         u8 tempcalsys[2];       /* 0x0028 - 0x0029 System Temperature Calibration Factors*/
  39         u8 res_1[22];           /* 0x0020 - 0x003f Reserved */
  40         u8 mac_size;            /* 0x0040          Mac table size */
  41         u8 mac_flag;            /* 0x0041          Mac table flags */
  42         u8 mac[8][6];           /* 0x0042 - 0x0071 Mac addresses */
  43         u32 crc;                /* 0x0072          crc32 checksum */
  44 } EEPROM_data;
  45
  46 static EEPROM_data mac_data;
  47
  48 int mac_show(void)
  49 {
  50         int i;
  51         u8 mac_size;
  52         unsigned char ethaddr[8][18];
  53         unsigned char enetvar[32];
  54
  55         /* Show EEPROM tagID,
  56          * always the four characters 'NXID'.
  57          */
  58         printf("ID ");
  59         for (i = 0; i < 4; i++)
  60                 printf("%c", mac_data.id[i]);
  61         printf("\n");
  62
  63         /* Show Serial number,
  64          * 0 to 11 charaters of errata information.
  65          */
  66         printf("SN ");
  67         for (i = 0; i < 12; i++)
  68                 printf("%c", mac_data.sn[i]);
  69         printf("\n");
  70
  71         /* Show Errata Level,
  72          * 0 to 4 characters of errata information.
  73          */
  74         printf("Errata ");
  75         for (i = 0; i < 5; i++)
  76                 printf("%c", mac_data.errata[i]);
  77         printf("\n");
  78
  79         /* Show Build Date,
  80          * BCD date values, as YYMMDDhhmmss.
  81          */
  82         printf("Date 20%02x\/%02x\/%02x %02x:%02x:%02x\n",
  83                mac_data.date[0],
  84                mac_data.date[1],
  85                mac_data.date[2],
  86                mac_data.date[3],
  87                mac_data.date[4],
  88                mac_data.date[5]);
  89
  90         /* Show MAC table size,
  91          * Value from 0 to 7 indicating how many MAC
  92          * addresses are stored in the system EEPROM.
  93          */
  94         if((mac_data.mac_size > 0) && (mac_data.mac_size <= 8))
  95                 mac_size = mac_data.mac_size;
  96         else
  97                 mac_size = 8; /* Set the max size */
  98         printf("MACSIZE %x\n", mac_size);
  99
 100         /* Show Mac addresses */
 101         for (i = 0; i < mac_size; i++) {
 102                 sprintf((char *)ethaddr[i],
 103                         "%02x:%02x:%02x:%02x:%02x:%02x",
 104                         mac_data.mac[i][0],
 105                         mac_data.mac[i][1],
 106                         mac_data.mac[i][2],
 107                         mac_data.mac[i][3],
 108                         mac_data.mac[i][4],
 109                         mac_data.mac[i][5]);
 110                 printf("MAC %d %s\n", i, ethaddr[i]);
 111
 112                 sprintf((char *)enetvar,
 113                         i ? "eth%daddr" : "ethaddr", i);
 114                 setenv((char *)enetvar, (char *)ethaddr[i]);
 115
 116         }
 117
 118         return 0;
 119 }
 120
 121 int mac_read(void)
 122 {
 123         int ret, length;
 124         unsigned int crc = 0;
 125         unsigned char dev = ID_EEPROM_ADDR, *data;
 126
 127         length = sizeof(EEPROM_data);
 128         ret = i2c_read(dev, 0, 1, (unsigned char *)(&mac_data), length);
 129         if (ret) {
 130                 printf("Read failed.\n");
 131                 return -1;
 132         }
 133
 134         data = (unsigned char *)(&mac_data);
 135         printf("Check CRC on reading ...");
 136         crc = crc32(crc, data, length - 4);
 137         if (crc != mac_data.crc) {
 138                 printf("CRC checksum is invalid, in EEPROM CRC is %x, calculated CRC is %x\n",
 139                      mac_data.crc, crc);
 140                 return -1;
 141         } else {
 142                 printf("CRC OK\n");
 143                 mac_show();
 144         }
 145         return 0;
 146 }
 147
 148 int mac_prog(void)
 149 {
 150         int ret, i, length;
 151         unsigned int crc = 0;
 152         unsigned char dev = ID_EEPROM_ADDR, *ptr;
 153         unsigned char *eeprom_data = (unsigned char *)(&mac_data);
 154
 155         mac_data.res_0 = 0;
 156         memset((void *)mac_data.res_1, 0, sizeof(mac_data.res_1));
 157
 158         length = sizeof(EEPROM_data);
 159         crc = crc32(crc, eeprom_data, length - 4);
 160         mac_data.crc = crc;
 161         for (i = 0, ptr = eeprom_data; i < length; i += 8, ptr += 8) {
 162                 ret = i2c_write(dev, i, 1, ptr, min((length - i),8));
 163                 udelay(5000);   /* 5ms write cycle timing */
 164                 if (ret)
 165                         break;
 166         }
 167         if (ret) {
 168                 printf("Programming failed.\n");
 169                 return -1;
 170         } else {
 171                 printf("Programming %d bytes. Reading back ...\n", length);
 172                 mac_read();
 173         }
 174         return 0;
 175 }
 176
 177 int do_mac(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 178 {
 179         int i;
 180         char cmd = 's';
 181         unsigned long long mac_val;
 182
 183         if (i2c_probe(ID_EEPROM_ADDR) != 0)
 184                 return -1;
 185
 186         if (argc > 1) {
 187                 cmd = argv[1][0];
 188                 switch (cmd) {
 189                 case 'r':       /* display */
 190                         mac_read();
 191                         break;
 192                 case 's':       /* save */
 193                         mac_prog();
 194                         break;
 195                 case 'i':       /* id */
 196                         for (i = 0; i < 4; i++) {
 197                                 mac_data.id[i] = argv[2][i];
 198                         }
 199                         break;
 200                 case 'n':       /* serial number */
 201                         for (i = 0; i < 12; i++) {
 202                                 mac_data.sn[i] = argv[2][i];
 203                         }
 204                         break;
 205                 case 'e':       /* errata */
 206                         for (i = 0; i < 5; i++) {
 207                                 mac_data.errata[i] = argv[2][i];
 208                         }
 209                         break;
 210                 case 'd':       /* date */
 211                         mac_val = simple_strtoull(argv[2], NULL, 16);
 212                         for (i = 0; i < 6; i++) {
 213                                 mac_data.date[i] = (mac_val >> (40 - 8 * i));
 214                         }
 215                         break;
 216                 case 'p':       /* mac table size */
 217                         mac_data.mac_size =
 218                             (unsigned char)simple_strtoul(argv[2], NULL, 16);
 219                         break;
 220                 case '0':       /* mac 0 */
 221                 case '1':       /* mac 1 */
 222                 case '2':       /* mac 2 */
 223                 case '3':       /* mac 3 */
 224                 case '4':       /* mac 4 */
 225                 case '5':       /* mac 5 */
 226                 case '6':       /* mac 6 */
 227                 case '7':       /* mac 7 */
 228                         mac_val = simple_strtoull(argv[2], NULL, 16);
 229                         for (i = 0; i < 6; i++) {
 230                                 mac_data.mac[cmd - '0'][i] =
 231                                     *((unsigned char *)
 232                                       (((unsigned int)(&mac_val)) + i + 2));
 233                         }
 234                         break;
 235                 case 'h':       /* help */
 236                 default:
 237                         printf("Usage:\n%s\n", cmdtp->usage);
 238                         break;
 239                 }
 240         } else {
 241                 mac_show();
 242         }
 243         return 0;
 244 }
 245
 246 int mac_read_from_eeprom(void)
 247 {
 248         int length, i;
 249         unsigned char dev = ID_EEPROM_ADDR;
 250         unsigned char *data;
 251         unsigned char ethaddr[4][18];
 252         unsigned char enetvar[32];
 253         unsigned int crc = 0;
 254
 255         length = sizeof(EEPROM_data);
 256         if (i2c_read(dev, 0, 1, (unsigned char *)(&mac_data), length)) {
 257                 printf("Read failed.\n");
 258                 return -1;
 259         }
 260
 261         data = (unsigned char *)(&mac_data);
 262         crc = crc32(crc, data, length - 4);
 263         if (crc != mac_data.crc) {
 264                 return -1;
 265         } else {
 266                 for (i = 0; i < 4; i++) {
 267                         if (memcmp(&mac_data.mac[i], "\0\0\0\0\0\0", 6)) {
 268                                 sprintf((char *)ethaddr[i],
 269                                         "%02x:%02x:%02x:%02x:%02x:%02x",
 270                                         mac_data.mac[i][0],
 271                                         mac_data.mac[i][1],
 272                                         mac_data.mac[i][2],
 273                                         mac_data.mac[i][3],
 274                                         mac_data.mac[i][4],
 275                                         mac_data.mac[i][5]);
 276                                 sprintf((char *)enetvar,
 277                                         i ? "eth%daddr" : "ethaddr",
 278                                         i);
 279                                 setenv((char *)enetvar, (char *)ethaddr[i]);
 280                         }
 281                 }
 282         }
 283         return 0;
 284 }