drivers/ddr/fsl/options.c

   1 /*
   2  * Copyright 2008, 2010-2014 Freescale Semiconductor, Inc.
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <common.h>
   8 #include <hwconfig.h>
   9 #include <fsl_ddr_sdram.h>
  10
  11 #include <fsl_ddr.h>
  12
  13 /*
  14  * Use our own stack based buffer before relocation to allow accessing longer
  15  * hwconfig strings that might be in the environment before we've relocated.
  16  * This is pretty fragile on both the use of stack and if the buffer is big
  17  * enough. However we will get a warning from getenv_f for the later.
  18  */
  19
  20 /* Board-specific functions defined in each board's ddr.c */
  21 extern void fsl_ddr_board_options(memctl_options_t *popts,
  22                 dimm_params_t *pdimm,
  23                 unsigned int ctrl_num);
  24
  25 struct dynamic_odt {
  26         unsigned int odt_rd_cfg;
  27         unsigned int odt_wr_cfg;
  28         unsigned int odt_rtt_norm;
  29         unsigned int odt_rtt_wr;
  30 };
  31
  32 #if defined(CONFIG_SYS_FSL_DDR3) || defined(CONFIG_SYS_FSL_DDR4)
  33 static const struct dynamic_odt single_Q[4] = {
  34         {       /* cs0 */
  35                 FSL_DDR_ODT_NEVER,
  36                 FSL_DDR_ODT_CS_AND_OTHER_DIMM,
  37                 DDR3_RTT_20_OHM,
  38                 DDR3_RTT_120_OHM
  39         },
  40         {       /* cs1 */
  41                 FSL_DDR_ODT_NEVER,
  42                 FSL_DDR_ODT_NEVER,      /* tied high */
  43                 DDR3_RTT_OFF,
  44                 DDR3_RTT_120_OHM
  45         },
  46         {       /* cs2 */
  47                 FSL_DDR_ODT_NEVER,
  48                 FSL_DDR_ODT_CS_AND_OTHER_DIMM,
  49                 DDR3_RTT_20_OHM,
  50                 DDR3_RTT_120_OHM
  51         },
  52         {       /* cs3 */
  53                 FSL_DDR_ODT_NEVER,
  54                 FSL_DDR_ODT_NEVER,      /* tied high */
  55                 DDR3_RTT_OFF,
  56                 DDR3_RTT_120_OHM
  57         }
  58 };
  59
  60 static const struct dynamic_odt single_D[4] = {
  61         {       /* cs0 */
  62                 FSL_DDR_ODT_NEVER,
  63                 FSL_DDR_ODT_ALL,
  64                 DDR3_RTT_40_OHM,
  65                 DDR3_RTT_OFF
  66         },
  67         {       /* cs1 */
  68                 FSL_DDR_ODT_NEVER,
  69                 FSL_DDR_ODT_NEVER,
  70                 DDR3_RTT_OFF,
  71                 DDR3_RTT_OFF
  72         },
  73         {0, 0, 0, 0},
  74         {0, 0, 0, 0}
  75 };
  76
  77 static const struct dynamic_odt single_S[4] = {
  78         {       /* cs0 */
  79                 FSL_DDR_ODT_NEVER,
  80                 FSL_DDR_ODT_ALL,
  81                 DDR3_RTT_40_OHM,
  82                 DDR3_RTT_OFF
  83         },
  84         {0, 0, 0, 0},
  85         {0, 0, 0, 0},
  86         {0, 0, 0, 0},
  87 };
  88
  89 static const struct dynamic_odt dual_DD[4] = {
  90         {       /* cs0 */
  91                 FSL_DDR_ODT_NEVER,
  92                 FSL_DDR_ODT_SAME_DIMM,
  93                 DDR3_RTT_120_OHM,
  94                 DDR3_RTT_OFF
  95         },
  96         {       /* cs1 */
  97                 FSL_DDR_ODT_OTHER_DIMM,
  98                 FSL_DDR_ODT_OTHER_DIMM,
  99                 DDR3_RTT_30_OHM,
 100                 DDR3_RTT_OFF
 101         },
 102         {       /* cs2 */
 103                 FSL_DDR_ODT_NEVER,
 104                 FSL_DDR_ODT_SAME_DIMM,
 105                 DDR3_RTT_120_OHM,
 106                 DDR3_RTT_OFF
 107         },
 108         {       /* cs3 */
 109                 FSL_DDR_ODT_OTHER_DIMM,
 110                 FSL_DDR_ODT_OTHER_DIMM,
 111                 DDR3_RTT_30_OHM,
 112                 DDR3_RTT_OFF
 113         }
 114 };
 115
 116 static const struct dynamic_odt dual_DS[4] = {
 117         {       /* cs0 */
 118                 FSL_DDR_ODT_NEVER,
 119                 FSL_DDR_ODT_SAME_DIMM,
 120                 DDR3_RTT_120_OHM,
 121                 DDR3_RTT_OFF
 122         },
 123         {       /* cs1 */
 124                 FSL_DDR_ODT_OTHER_DIMM,
 125                 FSL_DDR_ODT_OTHER_DIMM,
 126                 DDR3_RTT_30_OHM,
 127                 DDR3_RTT_OFF
 128         },
 129         {       /* cs2 */
 130                 FSL_DDR_ODT_OTHER_DIMM,
 131                 FSL_DDR_ODT_ALL,
 132                 DDR3_RTT_20_OHM,
 133                 DDR3_RTT_120_OHM
 134         },
 135         {0, 0, 0, 0}
 136 };
 137 static const struct dynamic_odt dual_SD[4] = {
 138         {       /* cs0 */
 139                 FSL_DDR_ODT_OTHER_DIMM,
 140                 FSL_DDR_ODT_ALL,
 141                 DDR3_RTT_20_OHM,
 142                 DDR3_RTT_120_OHM
 143         },
 144         {0, 0, 0, 0},
 145         {       /* cs2 */
 146                 FSL_DDR_ODT_NEVER,
 147                 FSL_DDR_ODT_SAME_DIMM,
 148                 DDR3_RTT_120_OHM,
 149                 DDR3_RTT_OFF
 150         },
 151         {       /* cs3 */
 152                 FSL_DDR_ODT_OTHER_DIMM,
 153                 FSL_DDR_ODT_OTHER_DIMM,
 154                 DDR3_RTT_20_OHM,
 155                 DDR3_RTT_OFF
 156         }
 157 };
 158
 159 static const struct dynamic_odt dual_SS[4] = {
 160         {       /* cs0 */
 161                 FSL_DDR_ODT_OTHER_DIMM,
 162                 FSL_DDR_ODT_ALL,
 163                 DDR3_RTT_30_OHM,
 164                 DDR3_RTT_120_OHM
 165         },
 166         {0, 0, 0, 0},
 167         {       /* cs2 */
 168                 FSL_DDR_ODT_OTHER_DIMM,
 169                 FSL_DDR_ODT_ALL,
 170                 DDR3_RTT_30_OHM,
 171                 DDR3_RTT_120_OHM
 172         },
 173         {0, 0, 0, 0}
 174 };
 175
 176 static const struct dynamic_odt dual_D0[4] = {
 177         {       /* cs0 */
 178                 FSL_DDR_ODT_NEVER,
 179                 FSL_DDR_ODT_SAME_DIMM,
 180                 DDR3_RTT_40_OHM,
 181                 DDR3_RTT_OFF
 182         },
 183         {       /* cs1 */
 184                 FSL_DDR_ODT_NEVER,
 185                 FSL_DDR_ODT_NEVER,
 186                 DDR3_RTT_OFF,
 187                 DDR3_RTT_OFF
 188         },
 189         {0, 0, 0, 0},
 190         {0, 0, 0, 0}
 191 };
 192
 193 static const struct dynamic_odt dual_0D[4] = {
 194         {0, 0, 0, 0},
 195         {0, 0, 0, 0},
 196         {       /* cs2 */
 197                 FSL_DDR_ODT_NEVER,
 198                 FSL_DDR_ODT_SAME_DIMM,
 199                 DDR3_RTT_40_OHM,
 200                 DDR3_RTT_OFF
 201         },
 202         {       /* cs3 */
 203                 FSL_DDR_ODT_NEVER,
 204                 FSL_DDR_ODT_NEVER,
 205                 DDR3_RTT_OFF,
 206                 DDR3_RTT_OFF
 207         }
 208 };
 209
 210 static const struct dynamic_odt dual_S0[4] = {
 211         {       /* cs0 */
 212                 FSL_DDR_ODT_NEVER,
 213                 FSL_DDR_ODT_CS,
 214                 DDR3_RTT_40_OHM,
 215                 DDR3_RTT_OFF
 216         },
 217         {0, 0, 0, 0},
 218         {0, 0, 0, 0},
 219         {0, 0, 0, 0}
 220
 221 };
 222
 223 static const struct dynamic_odt dual_0S[4] = {
 224         {0, 0, 0, 0},
 225         {0, 0, 0, 0},
 226         {       /* cs2 */
 227                 FSL_DDR_ODT_NEVER,
 228                 FSL_DDR_ODT_CS,
 229                 DDR3_RTT_40_OHM,
 230                 DDR3_RTT_OFF
 231         },
 232         {0, 0, 0, 0}
 233
 234 };
 235
 236 static const struct dynamic_odt odt_unknown[4] = {
 237         {       /* cs0 */
 238                 FSL_DDR_ODT_NEVER,
 239                 FSL_DDR_ODT_CS,
 240                 DDR3_RTT_120_OHM,
 241                 DDR3_RTT_OFF
 242         },
 243         {       /* cs1 */
 244                 FSL_DDR_ODT_NEVER,
 245                 FSL_DDR_ODT_CS,
 246                 DDR3_RTT_120_OHM,
 247                 DDR3_RTT_OFF
 248         },
 249         {       /* cs2 */
 250                 FSL_DDR_ODT_NEVER,
 251                 FSL_DDR_ODT_CS,
 252                 DDR3_RTT_120_OHM,
 253                 DDR3_RTT_OFF
 254         },
 255         {       /* cs3 */
 256                 FSL_DDR_ODT_NEVER,
 257                 FSL_DDR_ODT_CS,
 258                 DDR3_RTT_120_OHM,
 259                 DDR3_RTT_OFF
 260         }
 261 };
 262 #else   /* CONFIG_SYS_FSL_DDR3 || CONFIG_SYS_FSL_DDR4 */
 263 static const struct dynamic_odt single_Q[4] = {
 264         {0, 0, 0, 0},
 265         {0, 0, 0, 0},
 266         {0, 0, 0, 0},
 267         {0, 0, 0, 0}
 268 };
 269
 270 static const struct dynamic_odt single_D[4] = {
 271         {       /* cs0 */
 272                 FSL_DDR_ODT_NEVER,
 273                 FSL_DDR_ODT_ALL,
 274                 DDR2_RTT_150_OHM,
 275                 DDR2_RTT_OFF
 276         },
 277         {       /* cs1 */
 278                 FSL_DDR_ODT_NEVER,
 279                 FSL_DDR_ODT_NEVER,
 280                 DDR2_RTT_OFF,
 281                 DDR2_RTT_OFF
 282         },
 283         {0, 0, 0, 0},
 284         {0, 0, 0, 0}
 285 };
 286
 287 static const struct dynamic_odt single_S[4] = {
 288         {       /* cs0 */
 289                 FSL_DDR_ODT_NEVER,
 290                 FSL_DDR_ODT_ALL,
 291                 DDR2_RTT_150_OHM,
 292                 DDR2_RTT_OFF
 293         },
 294         {0, 0, 0, 0},
 295         {0, 0, 0, 0},
 296         {0, 0, 0, 0},
 297 };
 298
 299 static const struct dynamic_odt dual_DD[4] = {
 300         {       /* cs0 */
 301                 FSL_DDR_ODT_OTHER_DIMM,
 302                 FSL_DDR_ODT_OTHER_DIMM,
 303                 DDR2_RTT_75_OHM,
 304                 DDR2_RTT_OFF
 305         },
 306         {       /* cs1 */
 307                 FSL_DDR_ODT_NEVER,
 308                 FSL_DDR_ODT_NEVER,
 309                 DDR2_RTT_OFF,
 310                 DDR2_RTT_OFF
 311         },
 312         {       /* cs2 */
 313                 FSL_DDR_ODT_OTHER_DIMM,
 314                 FSL_DDR_ODT_OTHER_DIMM,
 315                 DDR2_RTT_75_OHM,
 316                 DDR2_RTT_OFF
 317         },
 318         {       /* cs3 */
 319                 FSL_DDR_ODT_NEVER,
 320                 FSL_DDR_ODT_NEVER,
 321                 DDR2_RTT_OFF,
 322                 DDR2_RTT_OFF
 323         }
 324 };
 325
 326 static const struct dynamic_odt dual_DS[4] = {
 327         {       /* cs0 */
 328                 FSL_DDR_ODT_OTHER_DIMM,
 329                 FSL_DDR_ODT_OTHER_DIMM,
 330                 DDR2_RTT_75_OHM,
 331                 DDR2_RTT_OFF
 332         },
 333         {       /* cs1 */
 334                 FSL_DDR_ODT_NEVER,
 335                 FSL_DDR_ODT_NEVER,
 336                 DDR2_RTT_OFF,
 337                 DDR2_RTT_OFF
 338         },
 339         {       /* cs2 */
 340                 FSL_DDR_ODT_OTHER_DIMM,
 341                 FSL_DDR_ODT_OTHER_DIMM,
 342                 DDR2_RTT_75_OHM,
 343                 DDR2_RTT_OFF
 344         },
 345         {0, 0, 0, 0}
 346 };
 347
 348 static const struct dynamic_odt dual_SD[4] = {
 349         {       /* cs0 */
 350                 FSL_DDR_ODT_OTHER_DIMM,
 351                 FSL_DDR_ODT_OTHER_DIMM,
 352                 DDR2_RTT_75_OHM,
 353                 DDR2_RTT_OFF
 354         },
 355         {0, 0, 0, 0},
 356         {       /* cs2 */
 357                 FSL_DDR_ODT_OTHER_DIMM,
 358                 FSL_DDR_ODT_OTHER_DIMM,
 359                 DDR2_RTT_75_OHM,
 360                 DDR2_RTT_OFF
 361         },
 362         {       /* cs3 */
 363                 FSL_DDR_ODT_NEVER,
 364                 FSL_DDR_ODT_NEVER,
 365                 DDR2_RTT_OFF,
 366                 DDR2_RTT_OFF
 367         }
 368 };
 369
 370 static const struct dynamic_odt dual_SS[4] = {
 371         {       /* cs0 */
 372                 FSL_DDR_ODT_OTHER_DIMM,
 373                 FSL_DDR_ODT_OTHER_DIMM,
 374                 DDR2_RTT_75_OHM,
 375                 DDR2_RTT_OFF
 376         },
 377         {0, 0, 0, 0},
 378         {       /* cs2 */
 379                 FSL_DDR_ODT_OTHER_DIMM,
 380                 FSL_DDR_ODT_OTHER_DIMM,
 381                 DDR2_RTT_75_OHM,
 382                 DDR2_RTT_OFF
 383         },
 384         {0, 0, 0, 0}
 385 };
 386
 387 static const struct dynamic_odt dual_D0[4] = {
 388         {       /* cs0 */
 389                 FSL_DDR_ODT_NEVER,
 390                 FSL_DDR_ODT_ALL,
 391                 DDR2_RTT_150_OHM,
 392                 DDR2_RTT_OFF
 393         },
 394         {       /* cs1 */
 395                 FSL_DDR_ODT_NEVER,
 396                 FSL_DDR_ODT_NEVER,
 397                 DDR2_RTT_OFF,
 398                 DDR2_RTT_OFF
 399         },
 400         {0, 0, 0, 0},
 401         {0, 0, 0, 0}
 402 };
 403
 404 static const struct dynamic_odt dual_0D[4] = {
 405         {0, 0, 0, 0},
 406         {0, 0, 0, 0},
 407         {       /* cs2 */
 408                 FSL_DDR_ODT_NEVER,
 409                 FSL_DDR_ODT_ALL,
 410                 DDR2_RTT_150_OHM,
 411                 DDR2_RTT_OFF
 412         },
 413         {       /* cs3 */
 414                 FSL_DDR_ODT_NEVER,
 415                 FSL_DDR_ODT_NEVER,
 416                 DDR2_RTT_OFF,
 417                 DDR2_RTT_OFF
 418         }
 419 };
 420
 421 static const struct dynamic_odt dual_S0[4] = {
 422         {       /* cs0 */
 423                 FSL_DDR_ODT_NEVER,
 424                 FSL_DDR_ODT_CS,
 425                 DDR2_RTT_150_OHM,
 426                 DDR2_RTT_OFF
 427         },
 428         {0, 0, 0, 0},
 429         {0, 0, 0, 0},
 430         {0, 0, 0, 0}
 431
 432 };
 433
 434 static const struct dynamic_odt dual_0S[4] = {
 435         {0, 0, 0, 0},
 436         {0, 0, 0, 0},
 437         {       /* cs2 */
 438                 FSL_DDR_ODT_NEVER,
 439                 FSL_DDR_ODT_CS,
 440                 DDR2_RTT_150_OHM,
 441                 DDR2_RTT_OFF
 442         },
 443         {0, 0, 0, 0}
 444
 445 };
 446
 447 static const struct dynamic_odt odt_unknown[4] = {
 448         {       /* cs0 */
 449                 FSL_DDR_ODT_NEVER,
 450                 FSL_DDR_ODT_CS,
 451                 DDR2_RTT_75_OHM,
 452                 DDR2_RTT_OFF
 453         },
 454         {       /* cs1 */
 455                 FSL_DDR_ODT_NEVER,
 456                 FSL_DDR_ODT_NEVER,
 457                 DDR2_RTT_OFF,
 458                 DDR2_RTT_OFF
 459         },
 460         {       /* cs2 */
 461                 FSL_DDR_ODT_NEVER,
 462                 FSL_DDR_ODT_CS,
 463                 DDR2_RTT_75_OHM,
 464                 DDR2_RTT_OFF
 465         },
 466         {       /* cs3 */
 467                 FSL_DDR_ODT_NEVER,
 468                 FSL_DDR_ODT_NEVER,
 469                 DDR2_RTT_OFF,
 470                 DDR2_RTT_OFF
 471         }
 472 };
 473 #endif
 474
 475 /*
 476  * Automatically seleect bank interleaving mode based on DIMMs
 477  * in this order: cs0_cs1_cs2_cs3, cs0_cs1, null.
 478  * This function only deal with one or two slots per controller.
 479  */
 480 static inline unsigned int auto_bank_intlv(dimm_params_t *pdimm)
 481 {
 482 #if (CONFIG_DIMM_SLOTS_PER_CTLR == 1)
 483         if (pdimm[0].n_ranks == 4)
 484                 return FSL_DDR_CS0_CS1_CS2_CS3;
 485         else if (pdimm[0].n_ranks == 2)
 486                 return FSL_DDR_CS0_CS1;
 487 #elif (CONFIG_DIMM_SLOTS_PER_CTLR == 2)
 488 #ifdef CONFIG_FSL_DDR_FIRST_SLOT_QUAD_CAPABLE
 489         if (pdimm[0].n_ranks == 4)
 490                 return FSL_DDR_CS0_CS1_CS2_CS3;
 491 #endif
 492         if (pdimm[0].n_ranks == 2) {
 493                 if (pdimm[1].n_ranks == 2)
 494                         return FSL_DDR_CS0_CS1_CS2_CS3;
 495                 else
 496                         return FSL_DDR_CS0_CS1;
 497         }
 498 #endif
 499         return 0;
 500 }
 501
 502 unsigned int populate_memctl_options(int all_dimms_registered,
 503                         memctl_options_t *popts,
 504                         dimm_params_t *pdimm,
 505                         unsigned int ctrl_num)
 506 {
 507         unsigned int i;
 508         char buffer[HWCONFIG_BUFFER_SIZE];
 509         char *buf = NULL;
 510 #if defined(CONFIG_SYS_FSL_DDR3) || \
 511         defined(CONFIG_SYS_FSL_DDR2) || \
 512         defined(CONFIG_SYS_FSL_DDR4)
 513         const struct dynamic_odt *pdodt = odt_unknown;
 514 #endif
 515         ulong ddr_freq;
 516
 517         /*
 518          * Extract hwconfig from environment since we have not properly setup
 519          * the environment but need it for ddr config params
 520          */
 521         if (getenv_f("hwconfig", buffer, sizeof(buffer)) > 0)
 522                 buf = buffer;
 523
 524 #if defined(CONFIG_SYS_FSL_DDR3) || \
 525         defined(CONFIG_SYS_FSL_DDR2) || \
 526         defined(CONFIG_SYS_FSL_DDR4)
 527         /* Chip select options. */
 528         if (CONFIG_DIMM_SLOTS_PER_CTLR == 1) {
 529                 switch (pdimm[0].n_ranks) {
 530                 case 1:
 531                         pdodt = single_S;
 532                         break;
 533                 case 2:
 534                         pdodt = single_D;
 535                         break;
 536                 case 4:
 537                         pdodt = single_Q;
 538                         break;
 539                 }
 540         } else if (CONFIG_DIMM_SLOTS_PER_CTLR == 2) {
 541                 switch (pdimm[0].n_ranks) {
 542 #ifdef CONFIG_FSL_DDR_FIRST_SLOT_QUAD_CAPABLE
 543                 case 4:
 544                         pdodt = single_Q;
 545                         if (pdimm[1].n_ranks)
 546                                 printf("Error: Quad- and Dual-rank DIMMs "
 547                                         "cannot be used together\n");
 548                         break;
 549 #endif
 550                 case 2:
 551                         switch (pdimm[1].n_ranks) {
 552                         case 2:
 553                                 pdodt = dual_DD;
 554                                 break;
 555                         case 1:
 556                                 pdodt = dual_DS;
 557                                 break;
 558                         case 0:
 559                                 pdodt = dual_D0;
 560                                 break;
 561                         }
 562                         break;
 563                 case 1:
 564                         switch (pdimm[1].n_ranks) {
 565                         case 2:
 566                                 pdodt = dual_SD;
 567                                 break;
 568                         case 1:
 569                                 pdodt = dual_SS;
 570                                 break;
 571                         case 0:
 572                                 pdodt = dual_S0;
 573                                 break;
 574                         }
 575                         break;
 576                 case 0:
 577                         switch (pdimm[1].n_ranks) {
 578                         case 2:
 579                                 pdodt = dual_0D;
 580                                 break;
 581                         case 1:
 582                                 pdodt = dual_0S;
 583                                 break;
 584                         }
 585                         break;
 586                 }
 587         }
 588 #endif
 589
 590         /* Pick chip-select local options. */
 591         for (i = 0; i < CONFIG_CHIP_SELECTS_PER_CTRL; i++) {
 592 #if defined(CONFIG_SYS_FSL_DDR3) || \
 593         defined(CONFIG_SYS_FSL_DDR2) || \
 594         defined(CONFIG_SYS_FSL_DDR4)
 595                 popts->cs_local_opts[i].odt_rd_cfg = pdodt[i].odt_rd_cfg;
 596                 popts->cs_local_opts[i].odt_wr_cfg = pdodt[i].odt_wr_cfg;
 597                 popts->cs_local_opts[i].odt_rtt_norm = pdodt[i].odt_rtt_norm;
 598                 popts->cs_local_opts[i].odt_rtt_wr = pdodt[i].odt_rtt_wr;
 599 #else
 600                 popts->cs_local_opts[i].odt_rd_cfg = FSL_DDR_ODT_NEVER;
 601                 popts->cs_local_opts[i].odt_wr_cfg = FSL_DDR_ODT_CS;
 602 #endif
 603                 popts->cs_local_opts[i].auto_precharge = 0;
 604         }
 605
 606         /* Pick interleaving mode. */
 607
 608         /*
 609          * 0 = no interleaving
 610          * 1 = interleaving between 2 controllers
 611          */
 612         popts->memctl_interleaving = 0;
 613
 614         /*
 615          * 0 = cacheline
 616          * 1 = page
 617          * 2 = (logical) bank
 618          * 3 = superbank (only if CS interleaving is enabled)
 619          */
 620         popts->memctl_interleaving_mode = 0;
 621
 622         /*
 623          * 0: cacheline: bit 30 of the 36-bit physical addr selects the memctl
 624          * 1: page:      bit to the left of the column bits selects the memctl
 625          * 2: bank:      bit to the left of the bank bits selects the memctl
 626          * 3: superbank: bit to the left of the chip select selects the memctl
 627          *
 628          * NOTE: ba_intlv (rank interleaving) is independent of memory
 629          * controller interleaving; it is only within a memory controller.
 630          * Must use superbank interleaving if rank interleaving is used and
 631          * memory controller interleaving is enabled.
 632          */
 633
 634         /*
 635          * 0 = no
 636          * 0x40 = CS0,CS1
 637          * 0x20 = CS2,CS3
 638          * 0x60 = CS0,CS1 + CS2,CS3
 639          * 0x04 = CS0,CS1,CS2,CS3
 640          */
 641         popts->ba_intlv_ctl = 0;
 642
 643         /* Memory Organization Parameters */
 644         popts->registered_dimm_en = all_dimms_registered;
 645
 646         /* Operational Mode Paramters */
 647
 648         /* Pick ECC modes */
 649         popts->ecc_mode = 0;              /* 0 = disabled, 1 = enabled */
 650 #ifdef CONFIG_DDR_ECC
 651         if (hwconfig_sub_f("fsl_ddr", "ecc", buf)) {
 652                 if (hwconfig_subarg_cmp_f("fsl_ddr", "ecc", "on", buf))
 653                         popts->ecc_mode = 1;
 654         } else
 655                 popts->ecc_mode = 1;
 656 #endif
 657         popts->ecc_init_using_memctl = 1; /* 0 = use DMA, 1 = use memctl */
 658
 659         /*
 660          * Choose DQS config
 661          * 0 for DDR1
 662          * 1 for DDR2
 663          */
 664 #if defined(CONFIG_SYS_FSL_DDR1)
 665         popts->dqs_config = 0;
 666 #elif defined(CONFIG_SYS_FSL_DDR2) || defined(CONFIG_SYS_FSL_DDR3)
 667         popts->dqs_config = 1;
 668 #endif
 669
 670         /* Choose self-refresh during sleep. */
 671         popts->self_refresh_in_sleep = 1;
 672
 673         /* Choose dynamic power management mode. */
 674         popts->dynamic_power = 0;
 675
 676         /*
 677          * check first dimm for primary sdram width
 678          * presuming all dimms are similar
 679          * 0 = 64-bit, 1 = 32-bit, 2 = 16-bit
 680          */
 681 #if defined(CONFIG_SYS_FSL_DDR1) || defined(CONFIG_SYS_FSL_DDR2)
 682         if (pdimm[0].n_ranks != 0) {
 683                 if ((pdimm[0].data_width >= 64) && \
 684                         (pdimm[0].data_width <= 72))
 685                         popts->data_bus_width = 0;
 686                 else if ((pdimm[0].data_width >= 32) || \
 687                         (pdimm[0].data_width <= 40))
 688                         popts->data_bus_width = 1;
 689                 else {
 690                         panic("Error: data width %u is invalid!\n",
 691                                 pdimm[0].data_width);
 692                 }
 693         }
 694 #else
 695         if (pdimm[0].n_ranks != 0) {
 696                 if (pdimm[0].primary_sdram_width == 64)
 697                         popts->data_bus_width = 0;
 698                 else if (pdimm[0].primary_sdram_width == 32)
 699                         popts->data_bus_width = 1;
 700                 else if (pdimm[0].primary_sdram_width == 16)
 701                         popts->data_bus_width = 2;
 702                 else {
 703                         panic("Error: primary sdram width %u is invalid!\n",
 704                                 pdimm[0].primary_sdram_width);
 705                 }
 706         }
 707 #endif
 708
 709         popts->x4_en = (pdimm[0].device_width == 4) ? 1 : 0;
 710
 711         /* Choose burst length. */
 712 #if defined(CONFIG_SYS_FSL_DDR3) || defined(CONFIG_SYS_FSL_DDR4)
 713 #if defined(CONFIG_E500MC)
 714         popts->otf_burst_chop_en = 0;   /* on-the-fly burst chop disable */
 715         popts->burst_length = DDR_BL8;  /* Fixed 8-beat burst len */
 716 #else
 717         if ((popts->data_bus_width == 1) || (popts->data_bus_width == 2)) {
 718                 /* 32-bit or 16-bit bus */
 719                 popts->otf_burst_chop_en = 0;
 720                 popts->burst_length = DDR_BL8;
 721         } else {
 722                 popts->otf_burst_chop_en = 1;   /* on-the-fly burst chop */
 723                 popts->burst_length = DDR_OTF;  /* on-the-fly BC4 and BL8 */
 724         }
 725 #endif
 726 #else
 727         popts->burst_length = DDR_BL4;  /* has to be 4 for DDR2 */
 728 #endif
 729
 730         /* Choose ddr controller address mirror mode */
 731 #if defined(CONFIG_SYS_FSL_DDR3) || defined(CONFIG_SYS_FSL_DDR4)
 732         popts->mirrored_dimm = pdimm[0].mirrored_dimm;
 733 #endif
 734
 735         /* Global Timing Parameters. */
 736         debug("mclk_ps = %u ps\n", get_memory_clk_period_ps());
 737
 738         /* Pick a caslat override. */
 739         popts->cas_latency_override = 0;
 740         popts->cas_latency_override_value = 3;
 741         if (popts->cas_latency_override) {
 742                 debug("using caslat override value = %u\n",
 743                        popts->cas_latency_override_value);
 744         }
 745
 746         /* Decide whether to use the computed derated latency */
 747         popts->use_derated_caslat = 0;
 748
 749         /* Choose an additive latency. */
 750         popts->additive_latency_override = 0;
 751         popts->additive_latency_override_value = 3;
 752         if (popts->additive_latency_override) {
 753                 debug("using additive latency override value = %u\n",
 754                        popts->additive_latency_override_value);
 755         }
 756
 757         /*
 758          * 2T_EN setting
 759          *
 760          * Factors to consider for 2T_EN:
 761          *      - number of DIMMs installed
 762          *      - number of components, number of active ranks
 763          *      - how much time you want to spend playing around
 764          */
 765         popts->twot_en = 0;
 766         popts->threet_en = 0;
 767
 768         /* for RDIMM, address parity enable */
 769         popts->ap_en = 1;
 770
 771         /*
 772          * BSTTOPRE precharge interval
 773          *
 774          * Set this to 0 for global auto precharge
 775          * The value of 0x100 has been used for DDR1, DDR2, DDR3.
 776          * It is not wrong. Any value should be OK. The performance depends on
 777          * applications. There is no one good value for all.
 778          */
 779         popts->bstopre = 0x100;
 780
 781         /* Minimum CKE pulse width -- tCKE(MIN) */
 782         popts->tcke_clock_pulse_width_ps
 783                 = mclk_to_picos(FSL_DDR_MIN_TCKE_PULSE_WIDTH_DDR);
 784
 785         /*
 786          * Window for four activates -- tFAW
 787          *
 788          * FIXME: UM: applies only to DDR2/DDR3 with eight logical banks only
 789          * FIXME: varies depending upon number of column addresses or data
 790          * FIXME: width, was considering looking at pdimm->primary_sdram_width
 791          */
 792 #if defined(CONFIG_SYS_FSL_DDR1)
 793         popts->tfaw_window_four_activates_ps = mclk_to_picos(1);
 794
 795 #elif defined(CONFIG_SYS_FSL_DDR2)
 796         /*
 797          * x4/x8;  some datasheets have 35000
 798          * x16 wide columns only?  Use 50000?
 799          */
 800         popts->tfaw_window_four_activates_ps = 37500;
 801
 802 #else
 803         popts->tfaw_window_four_activates_ps = pdimm[0].tfaw_ps;
 804 #endif
 805         popts->zq_en = 0;
 806         popts->wrlvl_en = 0;
 807 #if defined(CONFIG_SYS_FSL_DDR3) || defined(CONFIG_SYS_FSL_DDR4)
 808         /*
 809          * due to ddr3 dimm is fly-by topology
 810          * we suggest to enable write leveling to
 811          * meet the tQDSS under different loading.
 812          */
 813         popts->wrlvl_en = 1;
 814         popts->zq_en = 1;
 815         popts->wrlvl_override = 0;
 816 #endif
 817
 818         /*
 819          * Check interleaving configuration from environment.
 820          * Please refer to doc/README.fsl-ddr for the detail.
 821          *
 822          * If memory controller interleaving is enabled, then the data
 823          * bus widths must be programmed identically for all memory controllers.
 824          *
 825          * Attempt to set all controllers to the same chip select
 826          * interleaving mode. It will do a best effort to get the
 827          * requested ranks interleaved together such that the result
 828          * should be a subset of the requested configuration.
 829          *
 830          * if CONFIG_SYS_FSL_DDR_INTLV_256B is defined, mandatory interleaving
 831          * with 256 Byte is enabled.
 832          */
 833 #if (CONFIG_NUM_DDR_CONTROLLERS > 1)
 834         if (!hwconfig_sub_f("fsl_ddr", "ctlr_intlv", buf))
 835 #ifdef CONFIG_SYS_FSL_DDR_INTLV_256B
 836                 ;
 837 #else
 838                 goto done;
 839 #endif
 840         if (pdimm[0].n_ranks == 0) {
 841                 printf("There is no rank on CS0 for controller %d.\n", ctrl_num);
 842                 popts->memctl_interleaving = 0;
 843                 goto done;
 844         }
 845         popts->memctl_interleaving = 1;
 846 #ifdef CONFIG_SYS_FSL_DDR_INTLV_256B
 847         popts->memctl_interleaving_mode = FSL_DDR_256B_INTERLEAVING;
 848         popts->memctl_interleaving = 1;
 849         debug("256 Byte interleaving\n");
 850         goto done;
 851 #endif
 852         /*
 853          * test null first. if CONFIG_HWCONFIG is not defined
 854          * hwconfig_arg_cmp returns non-zero
 855          */
 856         if (hwconfig_subarg_cmp_f("fsl_ddr", "ctlr_intlv",
 857                                     "null", buf)) {
 858                 popts->memctl_interleaving = 0;
 859                 debug("memory controller interleaving disabled.\n");
 860         } else if (hwconfig_subarg_cmp_f("fsl_ddr",
 861                                         "ctlr_intlv",
 862                                         "cacheline", buf)) {
 863                 popts->memctl_interleaving_mode =
 864                         ((CONFIG_NUM_DDR_CONTROLLERS == 3) && ctrl_num == 2) ?
 865                         0 : FSL_DDR_CACHE_LINE_INTERLEAVING;
 866                 popts->memctl_interleaving =
 867                         ((CONFIG_NUM_DDR_CONTROLLERS == 3) && ctrl_num == 2) ?
 868                         0 : 1;
 869         } else if (hwconfig_subarg_cmp_f("fsl_ddr",
 870                                         "ctlr_intlv",
 871                                         "page", buf)) {
 872                 popts->memctl_interleaving_mode =
 873                         ((CONFIG_NUM_DDR_CONTROLLERS == 3) && ctrl_num == 2) ?
 874                         0 : FSL_DDR_PAGE_INTERLEAVING;
 875                 popts->memctl_interleaving =
 876                         ((CONFIG_NUM_DDR_CONTROLLERS == 3) && ctrl_num == 2) ?
 877                         0 : 1;
 878         } else if (hwconfig_subarg_cmp_f("fsl_ddr",
 879                                         "ctlr_intlv",
 880                                         "bank", buf)) {
 881                 popts->memctl_interleaving_mode =
 882                         ((CONFIG_NUM_DDR_CONTROLLERS == 3) && ctrl_num == 2) ?
 883                         0 : FSL_DDR_BANK_INTERLEAVING;
 884                 popts->memctl_interleaving =
 885                         ((CONFIG_NUM_DDR_CONTROLLERS == 3) && ctrl_num == 2) ?
 886                         0 : 1;
 887         } else if (hwconfig_subarg_cmp_f("fsl_ddr",
 888                                         "ctlr_intlv",
 889                                         "superbank", buf)) {
 890                 popts->memctl_interleaving_mode =
 891                         ((CONFIG_NUM_DDR_CONTROLLERS == 3) && ctrl_num == 2) ?
 892                         0 : FSL_DDR_SUPERBANK_INTERLEAVING;
 893                 popts->memctl_interleaving =
 894                         ((CONFIG_NUM_DDR_CONTROLLERS == 3) && ctrl_num == 2) ?
 895                         0 : 1;
 896 #if (CONFIG_NUM_DDR_CONTROLLERS == 3)
 897         } else if (hwconfig_subarg_cmp_f("fsl_ddr",
 898                                         "ctlr_intlv",
 899                                         "3way_1KB", buf)) {
 900                 popts->memctl_interleaving_mode =
 901                         FSL_DDR_3WAY_1KB_INTERLEAVING;
 902         } else if (hwconfig_subarg_cmp_f("fsl_ddr",
 903                                         "ctlr_intlv",
 904                                         "3way_4KB", buf)) {
 905                 popts->memctl_interleaving_mode =
 906                         FSL_DDR_3WAY_4KB_INTERLEAVING;
 907         } else if (hwconfig_subarg_cmp_f("fsl_ddr",
 908                                         "ctlr_intlv",
 909                                         "3way_8KB", buf)) {
 910                 popts->memctl_interleaving_mode =
 911                         FSL_DDR_3WAY_8KB_INTERLEAVING;
 912 #elif (CONFIG_NUM_DDR_CONTROLLERS == 4)
 913         } else if (hwconfig_subarg_cmp_f("fsl_ddr",
 914                                         "ctlr_intlv",
 915                                         "4way_1KB", buf)) {
 916                 popts->memctl_interleaving_mode =
 917                         FSL_DDR_4WAY_1KB_INTERLEAVING;
 918         } else if (hwconfig_subarg_cmp_f("fsl_ddr",
 919                                         "ctlr_intlv",
 920                                         "4way_4KB", buf)) {
 921                 popts->memctl_interleaving_mode =
 922                         FSL_DDR_4WAY_4KB_INTERLEAVING;
 923         } else if (hwconfig_subarg_cmp_f("fsl_ddr",
 924                                         "ctlr_intlv",
 925                                         "4way_8KB", buf)) {
 926                 popts->memctl_interleaving_mode =
 927                         FSL_DDR_4WAY_8KB_INTERLEAVING;
 928 #endif
 929         } else {
 930                 popts->memctl_interleaving = 0;
 931                 printf("hwconfig has unrecognized parameter for ctlr_intlv.\n");
 932         }
 933 done:
 934 #endif
 935         if ((hwconfig_sub_f("fsl_ddr", "bank_intlv", buf)) &&
 936                 (CONFIG_CHIP_SELECTS_PER_CTRL > 1)) {
 937                 /* test null first. if CONFIG_HWCONFIG is not defined,
 938                  * hwconfig_subarg_cmp_f returns non-zero */
 939                 if (hwconfig_subarg_cmp_f("fsl_ddr", "bank_intlv",
 940                                             "null", buf))
 941                         debug("bank interleaving disabled.\n");
 942                 else if (hwconfig_subarg_cmp_f("fsl_ddr", "bank_intlv",
 943                                                  "cs0_cs1", buf))
 944                         popts->ba_intlv_ctl = FSL_DDR_CS0_CS1;
 945                 else if (hwconfig_subarg_cmp_f("fsl_ddr", "bank_intlv",
 946                                                  "cs2_cs3", buf))
 947                         popts->ba_intlv_ctl = FSL_DDR_CS2_CS3;
 948                 else if (hwconfig_subarg_cmp_f("fsl_ddr", "bank_intlv",
 949                                                  "cs0_cs1_and_cs2_cs3", buf))
 950                         popts->ba_intlv_ctl = FSL_DDR_CS0_CS1_AND_CS2_CS3;
 951                 else if (hwconfig_subarg_cmp_f("fsl_ddr", "bank_intlv",
 952                                                  "cs0_cs1_cs2_cs3", buf))
 953                         popts->ba_intlv_ctl = FSL_DDR_CS0_CS1_CS2_CS3;
 954                 else if (hwconfig_subarg_cmp_f("fsl_ddr", "bank_intlv",
 955                                                 "auto", buf))
 956                         popts->ba_intlv_ctl = auto_bank_intlv(pdimm);
 957                 else
 958                         printf("hwconfig has unrecognized parameter for bank_intlv.\n");
 959                 switch (popts->ba_intlv_ctl & FSL_DDR_CS0_CS1_CS2_CS3) {
 960                 case FSL_DDR_CS0_CS1_CS2_CS3:
 961 #if (CONFIG_DIMM_SLOTS_PER_CTLR == 1)
 962                         if (pdimm[0].n_ranks < 4) {
 963                                 popts->ba_intlv_ctl = 0;
 964                                 printf("Not enough bank(chip-select) for "
 965                                         "CS0+CS1+CS2+CS3 on controller %d, "
 966                                         "interleaving disabled!\n", ctrl_num);
 967                         }
 968 #elif (CONFIG_DIMM_SLOTS_PER_CTLR == 2)
 969 #ifdef CONFIG_FSL_DDR_FIRST_SLOT_QUAD_CAPABLE
 970                         if (pdimm[0].n_ranks == 4)
 971                                 break;
 972 #endif
 973                         if ((pdimm[0].n_ranks < 2) && (pdimm[1].n_ranks < 2)) {
 974                                 popts->ba_intlv_ctl = 0;
 975                                 printf("Not enough bank(chip-select) for "
 976                                         "CS0+CS1+CS2+CS3 on controller %d, "
 977                                         "interleaving disabled!\n", ctrl_num);
 978                         }
 979                         if (pdimm[0].capacity != pdimm[1].capacity) {
 980                                 popts->ba_intlv_ctl = 0;
 981                                 printf("Not identical DIMM size for "
 982                                         "CS0+CS1+CS2+CS3 on controller %d, "
 983                                         "interleaving disabled!\n", ctrl_num);
 984                         }
 985 #endif
 986                         break;
 987                 case FSL_DDR_CS0_CS1:
 988                         if (pdimm[0].n_ranks < 2) {
 989                                 popts->ba_intlv_ctl = 0;
 990                                 printf("Not enough bank(chip-select) for "
 991                                         "CS0+CS1 on controller %d, "
 992                                         "interleaving disabled!\n", ctrl_num);
 993                         }
 994                         break;
 995                 case FSL_DDR_CS2_CS3:
 996 #if (CONFIG_DIMM_SLOTS_PER_CTLR == 1)
 997                         if (pdimm[0].n_ranks < 4) {
 998                                 popts->ba_intlv_ctl = 0;
 999                                 printf("Not enough bank(chip-select) for CS2+CS3 "
1000                                         "on controller %d, interleaving disabled!\n", ctrl_num);
1001                         }
1002 #elif (CONFIG_DIMM_SLOTS_PER_CTLR == 2)
1003                         if (pdimm[1].n_ranks < 2) {
1004                                 popts->ba_intlv_ctl = 0;
1005                                 printf("Not enough bank(chip-select) for CS2+CS3 "
1006                                         "on controller %d, interleaving disabled!\n", ctrl_num);
1007                         }
1008 #endif
1009                         break;
1010                 case FSL_DDR_CS0_CS1_AND_CS2_CS3:
1011 #if (CONFIG_DIMM_SLOTS_PER_CTLR == 1)
1012                         if (pdimm[0].n_ranks < 4) {
1013                                 popts->ba_intlv_ctl = 0;
1014                                 printf("Not enough bank(CS) for CS0+CS1 and "
1015                                         "CS2+CS3 on controller %d, "
1016                                         "interleaving disabled!\n", ctrl_num);
1017                         }
1018 #elif (CONFIG_DIMM_SLOTS_PER_CTLR == 2)
1019                         if ((pdimm[0].n_ranks < 2) || (pdimm[1].n_ranks < 2)) {
1020                                 popts->ba_intlv_ctl = 0;
1021                                 printf("Not enough bank(CS) for CS0+CS1 and "
1022                                         "CS2+CS3 on controller %d, "
1023                                         "interleaving disabled!\n", ctrl_num);
1024                         }
1025 #endif
1026                         break;
1027                 default:
1028                         popts->ba_intlv_ctl = 0;
1029                         break;
1030                 }
1031         }
1032
1033         if (hwconfig_sub_f("fsl_ddr", "addr_hash", buf)) {
1034                 if (hwconfig_subarg_cmp_f("fsl_ddr", "addr_hash", "null", buf))
1035                         popts->addr_hash = 0;
1036                 else if (hwconfig_subarg_cmp_f("fsl_ddr", "addr_hash",
1037                                                "true", buf))
1038                         popts->addr_hash = 1;
1039         }
1040
1041         if (pdimm[0].n_ranks == 4)
1042                 popts->quad_rank_present = 1;
1043
1044         ddr_freq = get_ddr_freq(0) / 1000000;
1045         if (popts->registered_dimm_en) {
1046                 popts->rcw_override = 1;
1047                 popts->rcw_1 = 0x000a5a00;
1048                 if (ddr_freq <= 800)
1049                         popts->rcw_2 = 0x00000000;
1050                 else if (ddr_freq <= 1066)
1051                         popts->rcw_2 = 0x00100000;
1052                 else if (ddr_freq <= 1333)
1053                         popts->rcw_2 = 0x00200000;
1054                 else
1055                         popts->rcw_2 = 0x00300000;
1056         }
1057
1058         fsl_ddr_board_options(popts, pdimm, ctrl_num);
1059
1060         return 0;
1061 }
1062
1063 void check_interleaving_options(fsl_ddr_info_t *pinfo)
1064 {
1065         int i, j, k, check_n_ranks, intlv_invalid = 0;
1066         unsigned int check_intlv, check_n_row_addr, check_n_col_addr;
1067         unsigned long long check_rank_density;
1068         struct dimm_params_s *dimm;
1069         /*
1070          * Check if all controllers are configured for memory
1071          * controller interleaving. Identical dimms are recommended. At least
1072          * the size, row and col address should be checked.
1073          */
1074         j = 0;
1075         check_n_ranks = pinfo->dimm_params[0][0].n_ranks;
1076         check_rank_density = pinfo->dimm_params[0][0].rank_density;
1077         check_n_row_addr =  pinfo->dimm_params[0][0].n_row_addr;
1078         check_n_col_addr = pinfo->dimm_params[0][0].n_col_addr;
1079         check_intlv = pinfo->memctl_opts[0].memctl_interleaving_mode;
1080         for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
1081                 dimm = &pinfo->dimm_params[i][0];
1082                 if (!pinfo->memctl_opts[i].memctl_interleaving) {
1083                         continue;
1084                 } else if (((check_rank_density != dimm->rank_density) ||
1085                      (check_n_ranks != dimm->n_ranks) ||
1086                      (check_n_row_addr != dimm->n_row_addr) ||
1087                      (check_n_col_addr != dimm->n_col_addr) ||
1088                      (check_intlv !=
1089                         pinfo->memctl_opts[i].memctl_interleaving_mode))){
1090                         intlv_invalid = 1;
1091                         break;
1092                 } else {
1093                         j++;
1094                 }
1095
1096         }
1097         if (intlv_invalid) {
1098                 for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++)
1099                         pinfo->memctl_opts[i].memctl_interleaving = 0;
1100                 printf("Not all DIMMs are identical. "
1101                         "Memory controller interleaving disabled.\n");
1102         } else {
1103                 switch (check_intlv) {
1104                 case FSL_DDR_256B_INTERLEAVING:
1105                 case FSL_DDR_CACHE_LINE_INTERLEAVING:
1106                 case FSL_DDR_PAGE_INTERLEAVING:
1107                 case FSL_DDR_BANK_INTERLEAVING:
1108                 case FSL_DDR_SUPERBANK_INTERLEAVING:
1109                         if (3 == CONFIG_NUM_DDR_CONTROLLERS)
1110                                 k = 2;
1111                         else
1112                                 k = CONFIG_NUM_DDR_CONTROLLERS;
1113                         break;
1114                 case FSL_DDR_3WAY_1KB_INTERLEAVING:
1115                 case FSL_DDR_3WAY_4KB_INTERLEAVING:
1116                 case FSL_DDR_3WAY_8KB_INTERLEAVING:
1117                 case FSL_DDR_4WAY_1KB_INTERLEAVING:
1118                 case FSL_DDR_4WAY_4KB_INTERLEAVING:
1119                 case FSL_DDR_4WAY_8KB_INTERLEAVING:
1120                 default:
1121                         k = CONFIG_NUM_DDR_CONTROLLERS;
1122                         break;
1123                 }
1124                 debug("%d of %d controllers are interleaving.\n", j, k);
1125                 if (j && (j != k)) {
1126                         for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++)
1127                                 pinfo->memctl_opts[i].memctl_interleaving = 0;
1128                         printf("Not all controllers have compatible "
1129                                 "interleaving mode. All disabled.\n");
1130                 }
1131         }
1132         debug("Checking interleaving options completed\n");
1133 }
1134
1135 int fsl_use_spd(void)
1136 {
1137         int use_spd = 0;
1138
1139 #ifdef CONFIG_DDR_SPD
1140         char buffer[HWCONFIG_BUFFER_SIZE];
1141         char *buf = NULL;
1142
1143         /*
1144          * Extract hwconfig from environment since we have not properly setup
1145          * the environment but need it for ddr config params
1146          */
1147         if (getenv_f("hwconfig", buffer, sizeof(buffer)) > 0)
1148                 buf = buffer;
1149
1150         /* if hwconfig is not enabled, or "sdram" is not defined, use spd */
1151         if (hwconfig_sub_f("fsl_ddr", "sdram", buf)) {
1152                 if (hwconfig_subarg_cmp_f("fsl_ddr", "sdram", "spd", buf))
1153                         use_spd = 1;
1154                 else if (hwconfig_subarg_cmp_f("fsl_ddr", "sdram",
1155                                                "fixed", buf))
1156                         use_spd = 0;
1157                 else
1158                         use_spd = 1;
1159         } else
1160                 use_spd = 1;
1161 #endif
1162
1163         return use_spd;
1164 }