drivers/ddr/fsl/options.c

   1 /*
   2  * Copyright 2008, 2010-2012 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 #ifdef CONFIG_SYS_FSL_DDR3
  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 */
 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) || defined(CONFIG_SYS_FSL_DDR2)
 511         const struct dynamic_odt *pdodt = odt_unknown;
 512 #endif
 513         ulong ddr_freq;
 514
 515         /*
 516          * Extract hwconfig from environment since we have not properly setup
 517          * the environment but need it for ddr config params
 518          */
 519         if (getenv_f("hwconfig", buffer, sizeof(buffer)) > 0)
 520                 buf = buffer;
 521
 522 #if defined(CONFIG_SYS_FSL_DDR3) || defined(CONFIG_SYS_FSL_DDR2)
 523         /* Chip select options. */
 524         if (CONFIG_DIMM_SLOTS_PER_CTLR == 1) {
 525                 switch (pdimm[0].n_ranks) {
 526                 case 1:
 527                         pdodt = single_S;
 528                         break;
 529                 case 2:
 530                         pdodt = single_D;
 531                         break;
 532                 case 4:
 533                         pdodt = single_Q;
 534                         break;
 535                 }
 536         } else if (CONFIG_DIMM_SLOTS_PER_CTLR == 2) {
 537                 switch (pdimm[0].n_ranks) {
 538 #ifdef CONFIG_FSL_DDR_FIRST_SLOT_QUAD_CAPABLE
 539                 case 4:
 540                         pdodt = single_Q;
 541                         if (pdimm[1].n_ranks)
 542                                 printf("Error: Quad- and Dual-rank DIMMs "
 543                                         "cannot be used together\n");
 544                         break;
 545 #endif
 546                 case 2:
 547                         switch (pdimm[1].n_ranks) {
 548                         case 2:
 549                                 pdodt = dual_DD;
 550                                 break;
 551                         case 1:
 552                                 pdodt = dual_DS;
 553                                 break;
 554                         case 0:
 555                                 pdodt = dual_D0;
 556                                 break;
 557                         }
 558                         break;
 559                 case 1:
 560                         switch (pdimm[1].n_ranks) {
 561                         case 2:
 562                                 pdodt = dual_SD;
 563                                 break;
 564                         case 1:
 565                                 pdodt = dual_SS;
 566                                 break;
 567                         case 0:
 568                                 pdodt = dual_S0;
 569                                 break;
 570                         }
 571                         break;
 572                 case 0:
 573                         switch (pdimm[1].n_ranks) {
 574                         case 2:
 575                                 pdodt = dual_0D;
 576                                 break;
 577                         case 1:
 578                                 pdodt = dual_0S;
 579                                 break;
 580                         }
 581                         break;
 582                 }
 583         }
 584 #endif
 585
 586         /* Pick chip-select local options. */
 587         for (i = 0; i < CONFIG_CHIP_SELECTS_PER_CTRL; i++) {
 588 #if defined(CONFIG_SYS_FSL_DDR3) || defined(CONFIG_SYS_FSL_DDR2)
 589                 popts->cs_local_opts[i].odt_rd_cfg = pdodt[i].odt_rd_cfg;
 590                 popts->cs_local_opts[i].odt_wr_cfg = pdodt[i].odt_wr_cfg;
 591                 popts->cs_local_opts[i].odt_rtt_norm = pdodt[i].odt_rtt_norm;
 592                 popts->cs_local_opts[i].odt_rtt_wr = pdodt[i].odt_rtt_wr;
 593 #else
 594                 popts->cs_local_opts[i].odt_rd_cfg = FSL_DDR_ODT_NEVER;
 595                 popts->cs_local_opts[i].odt_wr_cfg = FSL_DDR_ODT_CS;
 596 #endif
 597                 popts->cs_local_opts[i].auto_precharge = 0;
 598         }
 599
 600         /* Pick interleaving mode. */
 601
 602         /*
 603          * 0 = no interleaving
 604          * 1 = interleaving between 2 controllers
 605          */
 606         popts->memctl_interleaving = 0;
 607
 608         /*
 609          * 0 = cacheline
 610          * 1 = page
 611          * 2 = (logical) bank
 612          * 3 = superbank (only if CS interleaving is enabled)
 613          */
 614         popts->memctl_interleaving_mode = 0;
 615
 616         /*
 617          * 0: cacheline: bit 30 of the 36-bit physical addr selects the memctl
 618          * 1: page:      bit to the left of the column bits selects the memctl
 619          * 2: bank:      bit to the left of the bank bits selects the memctl
 620          * 3: superbank: bit to the left of the chip select selects the memctl
 621          *
 622          * NOTE: ba_intlv (rank interleaving) is independent of memory
 623          * controller interleaving; it is only within a memory controller.
 624          * Must use superbank interleaving if rank interleaving is used and
 625          * memory controller interleaving is enabled.
 626          */
 627
 628         /*
 629          * 0 = no
 630          * 0x40 = CS0,CS1
 631          * 0x20 = CS2,CS3
 632          * 0x60 = CS0,CS1 + CS2,CS3
 633          * 0x04 = CS0,CS1,CS2,CS3
 634          */
 635         popts->ba_intlv_ctl = 0;
 636
 637         /* Memory Organization Parameters */
 638         popts->registered_dimm_en = all_dimms_registered;
 639
 640         /* Operational Mode Paramters */
 641
 642         /* Pick ECC modes */
 643         popts->ecc_mode = 0;              /* 0 = disabled, 1 = enabled */
 644 #ifdef CONFIG_DDR_ECC
 645         if (hwconfig_sub_f("fsl_ddr", "ecc", buf)) {
 646                 if (hwconfig_subarg_cmp_f("fsl_ddr", "ecc", "on", buf))
 647                         popts->ecc_mode = 1;
 648         } else
 649                 popts->ecc_mode = 1;
 650 #endif
 651         popts->ecc_init_using_memctl = 1; /* 0 = use DMA, 1 = use memctl */
 652
 653         /*
 654          * Choose DQS config
 655          * 0 for DDR1
 656          * 1 for DDR2
 657          */
 658 #if defined(CONFIG_SYS_FSL_DDR1)
 659         popts->dqs_config = 0;
 660 #elif defined(CONFIG_SYS_FSL_DDR2) || defined(CONFIG_SYS_FSL_DDR3)
 661         popts->dqs_config = 1;
 662 #endif
 663
 664         /* Choose self-refresh during sleep. */
 665         popts->self_refresh_in_sleep = 1;
 666
 667         /* Choose dynamic power management mode. */
 668         popts->dynamic_power = 0;
 669
 670         /*
 671          * check first dimm for primary sdram width
 672          * presuming all dimms are similar
 673          * 0 = 64-bit, 1 = 32-bit, 2 = 16-bit
 674          */
 675 #if defined(CONFIG_SYS_FSL_DDR1) || defined(CONFIG_SYS_FSL_DDR2)
 676         if (pdimm[0].n_ranks != 0) {
 677                 if ((pdimm[0].data_width >= 64) && \
 678                         (pdimm[0].data_width <= 72))
 679                         popts->data_bus_width = 0;
 680                 else if ((pdimm[0].data_width >= 32) || \
 681                         (pdimm[0].data_width <= 40))
 682                         popts->data_bus_width = 1;
 683                 else {
 684                         panic("Error: data width %u is invalid!\n",
 685                                 pdimm[0].data_width);
 686                 }
 687         }
 688 #else
 689         if (pdimm[0].n_ranks != 0) {
 690                 if (pdimm[0].primary_sdram_width == 64)
 691                         popts->data_bus_width = 0;
 692                 else if (pdimm[0].primary_sdram_width == 32)
 693                         popts->data_bus_width = 1;
 694                 else if (pdimm[0].primary_sdram_width == 16)
 695                         popts->data_bus_width = 2;
 696                 else {
 697                         panic("Error: primary sdram width %u is invalid!\n",
 698                                 pdimm[0].primary_sdram_width);
 699                 }
 700         }
 701 #endif
 702
 703         popts->x4_en = (pdimm[0].device_width == 4) ? 1 : 0;
 704
 705         /* Choose burst length. */
 706 #if defined(CONFIG_SYS_FSL_DDR3)
 707 #if defined(CONFIG_E500MC)
 708         popts->otf_burst_chop_en = 0;   /* on-the-fly burst chop disable */
 709         popts->burst_length = DDR_BL8;  /* Fixed 8-beat burst len */
 710 #else
 711         if ((popts->data_bus_width == 1) || (popts->data_bus_width == 2)) {
 712                 /* 32-bit or 16-bit bus */
 713                 popts->otf_burst_chop_en = 0;
 714                 popts->burst_length = DDR_BL8;
 715         } else {
 716                 popts->otf_burst_chop_en = 1;   /* on-the-fly burst chop */
 717                 popts->burst_length = DDR_OTF;  /* on-the-fly BC4 and BL8 */
 718         }
 719 #endif
 720 #else
 721         popts->burst_length = DDR_BL4;  /* has to be 4 for DDR2 */
 722 #endif
 723
 724         /* Choose ddr controller address mirror mode */
 725 #if defined(CONFIG_SYS_FSL_DDR3)
 726         popts->mirrored_dimm = pdimm[0].mirrored_dimm;
 727 #endif
 728
 729         /* Global Timing Parameters. */
 730         debug("mclk_ps = %u ps\n", get_memory_clk_period_ps());
 731
 732         /* Pick a caslat override. */
 733         popts->cas_latency_override = 0;
 734         popts->cas_latency_override_value = 3;
 735         if (popts->cas_latency_override) {
 736                 debug("using caslat override value = %u\n",
 737                        popts->cas_latency_override_value);
 738         }
 739
 740         /* Decide whether to use the computed derated latency */
 741         popts->use_derated_caslat = 0;
 742
 743         /* Choose an additive latency. */
 744         popts->additive_latency_override = 0;
 745         popts->additive_latency_override_value = 3;
 746         if (popts->additive_latency_override) {
 747                 debug("using additive latency override value = %u\n",
 748                        popts->additive_latency_override_value);
 749         }
 750
 751         /*
 752          * 2T_EN setting
 753          *
 754          * Factors to consider for 2T_EN:
 755          *      - number of DIMMs installed
 756          *      - number of components, number of active ranks
 757          *      - how much time you want to spend playing around
 758          */
 759         popts->twot_en = 0;
 760         popts->threet_en = 0;
 761
 762         /* for RDIMM, address parity enable */
 763         popts->ap_en = 1;
 764
 765         /*
 766          * BSTTOPRE precharge interval
 767          *
 768          * Set this to 0 for global auto precharge
 769          *
 770          * FIXME: Should this be configured in picoseconds?
 771          * Why it should be in ps:  better understanding of this
 772          * relative to actual DRAM timing parameters such as tRAS.
 773          * e.g. tRAS(min) = 40 ns
 774          */
 775         popts->bstopre = 0x100;
 776
 777         /* Minimum CKE pulse width -- tCKE(MIN) */
 778         popts->tcke_clock_pulse_width_ps
 779                 = mclk_to_picos(FSL_DDR_MIN_TCKE_PULSE_WIDTH_DDR);
 780
 781         /*
 782          * Window for four activates -- tFAW
 783          *
 784          * FIXME: UM: applies only to DDR2/DDR3 with eight logical banks only
 785          * FIXME: varies depending upon number of column addresses or data
 786          * FIXME: width, was considering looking at pdimm->primary_sdram_width
 787          */
 788 #if defined(CONFIG_SYS_FSL_DDR1)
 789         popts->tfaw_window_four_activates_ps = mclk_to_picos(1);
 790
 791 #elif defined(CONFIG_SYS_FSL_DDR2)
 792         /*
 793          * x4/x8;  some datasheets have 35000
 794          * x16 wide columns only?  Use 50000?
 795          */
 796         popts->tfaw_window_four_activates_ps = 37500;
 797
 798 #elif defined(CONFIG_SYS_FSL_DDR3)
 799         popts->tfaw_window_four_activates_ps = pdimm[0].tfaw_ps;
 800 #endif
 801         popts->zq_en = 0;
 802         popts->wrlvl_en = 0;
 803 #if defined(CONFIG_SYS_FSL_DDR3)
 804         /*
 805          * due to ddr3 dimm is fly-by topology
 806          * we suggest to enable write leveling to
 807          * meet the tQDSS under different loading.
 808          */
 809         popts->wrlvl_en = 1;
 810         popts->zq_en = 1;
 811         popts->wrlvl_override = 0;
 812 #endif
 813
 814         /*
 815          * Check interleaving configuration from environment.
 816          * Please refer to doc/README.fsl-ddr for the detail.
 817          *
 818          * If memory controller interleaving is enabled, then the data
 819          * bus widths must be programmed identically for all memory controllers.
 820          *
 821          * Attempt to set all controllers to the same chip select
 822          * interleaving mode. It will do a best effort to get the
 823          * requested ranks interleaved together such that the result
 824          * should be a subset of the requested configuration.
 825          *
 826          * if CONFIG_SYS_FSL_DDR_INTLV_256B is defined, mandatory interleaving
 827          * with 256 Byte is enabled.
 828          */
 829 #if (CONFIG_NUM_DDR_CONTROLLERS > 1)
 830         if (!hwconfig_sub_f("fsl_ddr", "ctlr_intlv", buf))
 831 #ifdef CONFIG_SYS_FSL_DDR_INTLV_256B
 832                 ;
 833 #else
 834                 goto done;
 835 #endif
 836         if (pdimm[0].n_ranks == 0) {
 837                 printf("There is no rank on CS0 for controller %d.\n", ctrl_num);
 838                 popts->memctl_interleaving = 0;
 839                 goto done;
 840         }
 841         popts->memctl_interleaving = 1;
 842 #ifdef CONFIG_SYS_FSL_DDR_INTLV_256B
 843         popts->memctl_interleaving_mode = FSL_DDR_256B_INTERLEAVING;
 844         popts->memctl_interleaving = 1;
 845         debug("256 Byte interleaving\n");
 846         goto done;
 847 #endif
 848         /*
 849          * test null first. if CONFIG_HWCONFIG is not defined
 850          * hwconfig_arg_cmp returns non-zero
 851          */
 852         if (hwconfig_subarg_cmp_f("fsl_ddr", "ctlr_intlv",
 853                                     "null", buf)) {
 854                 popts->memctl_interleaving = 0;
 855                 debug("memory controller interleaving disabled.\n");
 856         } else if (hwconfig_subarg_cmp_f("fsl_ddr",
 857                                         "ctlr_intlv",
 858                                         "cacheline", buf)) {
 859                 popts->memctl_interleaving_mode =
 860                         ((CONFIG_NUM_DDR_CONTROLLERS == 3) && ctrl_num == 2) ?
 861                         0 : FSL_DDR_CACHE_LINE_INTERLEAVING;
 862                 popts->memctl_interleaving =
 863                         ((CONFIG_NUM_DDR_CONTROLLERS == 3) && ctrl_num == 2) ?
 864                         0 : 1;
 865         } else if (hwconfig_subarg_cmp_f("fsl_ddr",
 866                                         "ctlr_intlv",
 867                                         "page", buf)) {
 868                 popts->memctl_interleaving_mode =
 869                         ((CONFIG_NUM_DDR_CONTROLLERS == 3) && ctrl_num == 2) ?
 870                         0 : FSL_DDR_PAGE_INTERLEAVING;
 871                 popts->memctl_interleaving =
 872                         ((CONFIG_NUM_DDR_CONTROLLERS == 3) && ctrl_num == 2) ?
 873                         0 : 1;
 874         } else if (hwconfig_subarg_cmp_f("fsl_ddr",
 875                                         "ctlr_intlv",
 876                                         "bank", buf)) {
 877                 popts->memctl_interleaving_mode =
 878                         ((CONFIG_NUM_DDR_CONTROLLERS == 3) && ctrl_num == 2) ?
 879                         0 : FSL_DDR_BANK_INTERLEAVING;
 880                 popts->memctl_interleaving =
 881                         ((CONFIG_NUM_DDR_CONTROLLERS == 3) && ctrl_num == 2) ?
 882                         0 : 1;
 883         } else if (hwconfig_subarg_cmp_f("fsl_ddr",
 884                                         "ctlr_intlv",
 885                                         "superbank", buf)) {
 886                 popts->memctl_interleaving_mode =
 887                         ((CONFIG_NUM_DDR_CONTROLLERS == 3) && ctrl_num == 2) ?
 888                         0 : FSL_DDR_SUPERBANK_INTERLEAVING;
 889                 popts->memctl_interleaving =
 890                         ((CONFIG_NUM_DDR_CONTROLLERS == 3) && ctrl_num == 2) ?
 891                         0 : 1;
 892 #if (CONFIG_NUM_DDR_CONTROLLERS == 3)
 893         } else if (hwconfig_subarg_cmp_f("fsl_ddr",
 894                                         "ctlr_intlv",
 895                                         "3way_1KB", buf)) {
 896                 popts->memctl_interleaving_mode =
 897                         FSL_DDR_3WAY_1KB_INTERLEAVING;
 898         } else if (hwconfig_subarg_cmp_f("fsl_ddr",
 899                                         "ctlr_intlv",
 900                                         "3way_4KB", buf)) {
 901                 popts->memctl_interleaving_mode =
 902                         FSL_DDR_3WAY_4KB_INTERLEAVING;
 903         } else if (hwconfig_subarg_cmp_f("fsl_ddr",
 904                                         "ctlr_intlv",
 905                                         "3way_8KB", buf)) {
 906                 popts->memctl_interleaving_mode =
 907                         FSL_DDR_3WAY_8KB_INTERLEAVING;
 908 #elif (CONFIG_NUM_DDR_CONTROLLERS == 4)
 909         } else if (hwconfig_subarg_cmp_f("fsl_ddr",
 910                                         "ctlr_intlv",
 911                                         "4way_1KB", buf)) {
 912                 popts->memctl_interleaving_mode =
 913                         FSL_DDR_4WAY_1KB_INTERLEAVING;
 914         } else if (hwconfig_subarg_cmp_f("fsl_ddr",
 915                                         "ctlr_intlv",
 916                                         "4way_4KB", buf)) {
 917                 popts->memctl_interleaving_mode =
 918                         FSL_DDR_4WAY_4KB_INTERLEAVING;
 919         } else if (hwconfig_subarg_cmp_f("fsl_ddr",
 920                                         "ctlr_intlv",
 921                                         "4way_8KB", buf)) {
 922                 popts->memctl_interleaving_mode =
 923                         FSL_DDR_4WAY_8KB_INTERLEAVING;
 924 #endif
 925         } else {
 926                 popts->memctl_interleaving = 0;
 927                 printf("hwconfig has unrecognized parameter for ctlr_intlv.\n");
 928         }
 929 done:
 930 #endif
 931         if ((hwconfig_sub_f("fsl_ddr", "bank_intlv", buf)) &&
 932                 (CONFIG_CHIP_SELECTS_PER_CTRL > 1)) {
 933                 /* test null first. if CONFIG_HWCONFIG is not defined,
 934                  * hwconfig_subarg_cmp_f returns non-zero */
 935                 if (hwconfig_subarg_cmp_f("fsl_ddr", "bank_intlv",
 936                                             "null", buf))
 937                         debug("bank interleaving disabled.\n");
 938                 else if (hwconfig_subarg_cmp_f("fsl_ddr", "bank_intlv",
 939                                                  "cs0_cs1", buf))
 940                         popts->ba_intlv_ctl = FSL_DDR_CS0_CS1;
 941                 else if (hwconfig_subarg_cmp_f("fsl_ddr", "bank_intlv",
 942                                                  "cs2_cs3", buf))
 943                         popts->ba_intlv_ctl = FSL_DDR_CS2_CS3;
 944                 else if (hwconfig_subarg_cmp_f("fsl_ddr", "bank_intlv",
 945                                                  "cs0_cs1_and_cs2_cs3", buf))
 946                         popts->ba_intlv_ctl = FSL_DDR_CS0_CS1_AND_CS2_CS3;
 947                 else if (hwconfig_subarg_cmp_f("fsl_ddr", "bank_intlv",
 948                                                  "cs0_cs1_cs2_cs3", buf))
 949                         popts->ba_intlv_ctl = FSL_DDR_CS0_CS1_CS2_CS3;
 950                 else if (hwconfig_subarg_cmp_f("fsl_ddr", "bank_intlv",
 951                                                 "auto", buf))
 952                         popts->ba_intlv_ctl = auto_bank_intlv(pdimm);
 953                 else
 954                         printf("hwconfig has unrecognized parameter for bank_intlv.\n");
 955                 switch (popts->ba_intlv_ctl & FSL_DDR_CS0_CS1_CS2_CS3) {
 956                 case FSL_DDR_CS0_CS1_CS2_CS3:
 957 #if (CONFIG_DIMM_SLOTS_PER_CTLR == 1)
 958                         if (pdimm[0].n_ranks < 4) {
 959                                 popts->ba_intlv_ctl = 0;
 960                                 printf("Not enough bank(chip-select) for "
 961                                         "CS0+CS1+CS2+CS3 on controller %d, "
 962                                         "interleaving disabled!\n", ctrl_num);
 963                         }
 964 #elif (CONFIG_DIMM_SLOTS_PER_CTLR == 2)
 965 #ifdef CONFIG_FSL_DDR_FIRST_SLOT_QUAD_CAPABLE
 966                         if (pdimm[0].n_ranks == 4)
 967                                 break;
 968 #endif
 969                         if ((pdimm[0].n_ranks < 2) && (pdimm[1].n_ranks < 2)) {
 970                                 popts->ba_intlv_ctl = 0;
 971                                 printf("Not enough bank(chip-select) for "
 972                                         "CS0+CS1+CS2+CS3 on controller %d, "
 973                                         "interleaving disabled!\n", ctrl_num);
 974                         }
 975                         if (pdimm[0].capacity != pdimm[1].capacity) {
 976                                 popts->ba_intlv_ctl = 0;
 977                                 printf("Not identical DIMM size for "
 978                                         "CS0+CS1+CS2+CS3 on controller %d, "
 979                                         "interleaving disabled!\n", ctrl_num);
 980                         }
 981 #endif
 982                         break;
 983                 case FSL_DDR_CS0_CS1:
 984                         if (pdimm[0].n_ranks < 2) {
 985                                 popts->ba_intlv_ctl = 0;
 986                                 printf("Not enough bank(chip-select) for "
 987                                         "CS0+CS1 on controller %d, "
 988                                         "interleaving disabled!\n", ctrl_num);
 989                         }
 990                         break;
 991                 case FSL_DDR_CS2_CS3:
 992 #if (CONFIG_DIMM_SLOTS_PER_CTLR == 1)
 993                         if (pdimm[0].n_ranks < 4) {
 994                                 popts->ba_intlv_ctl = 0;
 995                                 printf("Not enough bank(chip-select) for CS2+CS3 "
 996                                         "on controller %d, interleaving disabled!\n", ctrl_num);
 997                         }
 998 #elif (CONFIG_DIMM_SLOTS_PER_CTLR == 2)
 999                         if (pdimm[1].n_ranks < 2) {
1000                                 popts->ba_intlv_ctl = 0;
1001                                 printf("Not enough bank(chip-select) for CS2+CS3 "
1002                                         "on controller %d, interleaving disabled!\n", ctrl_num);
1003                         }
1004 #endif
1005                         break;
1006                 case FSL_DDR_CS0_CS1_AND_CS2_CS3:
1007 #if (CONFIG_DIMM_SLOTS_PER_CTLR == 1)
1008                         if (pdimm[0].n_ranks < 4) {
1009                                 popts->ba_intlv_ctl = 0;
1010                                 printf("Not enough bank(CS) for CS0+CS1 and "
1011                                         "CS2+CS3 on controller %d, "
1012                                         "interleaving disabled!\n", ctrl_num);
1013                         }
1014 #elif (CONFIG_DIMM_SLOTS_PER_CTLR == 2)
1015                         if ((pdimm[0].n_ranks < 2) || (pdimm[1].n_ranks < 2)) {
1016                                 popts->ba_intlv_ctl = 0;
1017                                 printf("Not enough bank(CS) for CS0+CS1 and "
1018                                         "CS2+CS3 on controller %d, "
1019                                         "interleaving disabled!\n", ctrl_num);
1020                         }
1021 #endif
1022                         break;
1023                 default:
1024                         popts->ba_intlv_ctl = 0;
1025                         break;
1026                 }
1027         }
1028
1029         if (hwconfig_sub_f("fsl_ddr", "addr_hash", buf)) {
1030                 if (hwconfig_subarg_cmp_f("fsl_ddr", "addr_hash", "null", buf))
1031                         popts->addr_hash = 0;
1032                 else if (hwconfig_subarg_cmp_f("fsl_ddr", "addr_hash",
1033                                                "true", buf))
1034                         popts->addr_hash = 1;
1035         }
1036
1037         if (pdimm[0].n_ranks == 4)
1038                 popts->quad_rank_present = 1;
1039
1040         ddr_freq = get_ddr_freq(0) / 1000000;
1041         if (popts->registered_dimm_en) {
1042                 popts->rcw_override = 1;
1043                 popts->rcw_1 = 0x000a5a00;
1044                 if (ddr_freq <= 800)
1045                         popts->rcw_2 = 0x00000000;
1046                 else if (ddr_freq <= 1066)
1047                         popts->rcw_2 = 0x00100000;
1048                 else if (ddr_freq <= 1333)
1049                         popts->rcw_2 = 0x00200000;
1050                 else
1051                         popts->rcw_2 = 0x00300000;
1052         }
1053
1054         fsl_ddr_board_options(popts, pdimm, ctrl_num);
1055
1056         return 0;
1057 }
1058
1059 void check_interleaving_options(fsl_ddr_info_t *pinfo)
1060 {
1061         int i, j, k, check_n_ranks, intlv_invalid = 0;
1062         unsigned int check_intlv, check_n_row_addr, check_n_col_addr;
1063         unsigned long long check_rank_density;
1064         struct dimm_params_s *dimm;
1065         /*
1066          * Check if all controllers are configured for memory
1067          * controller interleaving. Identical dimms are recommended. At least
1068          * the size, row and col address should be checked.
1069          */
1070         j = 0;
1071         check_n_ranks = pinfo->dimm_params[0][0].n_ranks;
1072         check_rank_density = pinfo->dimm_params[0][0].rank_density;
1073         check_n_row_addr =  pinfo->dimm_params[0][0].n_row_addr;
1074         check_n_col_addr = pinfo->dimm_params[0][0].n_col_addr;
1075         check_intlv = pinfo->memctl_opts[0].memctl_interleaving_mode;
1076         for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
1077                 dimm = &pinfo->dimm_params[i][0];
1078                 if (!pinfo->memctl_opts[i].memctl_interleaving) {
1079                         continue;
1080                 } else if (((check_rank_density != dimm->rank_density) ||
1081                      (check_n_ranks != dimm->n_ranks) ||
1082                      (check_n_row_addr != dimm->n_row_addr) ||
1083                      (check_n_col_addr != dimm->n_col_addr) ||
1084                      (check_intlv !=
1085                         pinfo->memctl_opts[i].memctl_interleaving_mode))){
1086                         intlv_invalid = 1;
1087                         break;
1088                 } else {
1089                         j++;
1090                 }
1091
1092         }
1093         if (intlv_invalid) {
1094                 for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++)
1095                         pinfo->memctl_opts[i].memctl_interleaving = 0;
1096                 printf("Not all DIMMs are identical. "
1097                         "Memory controller interleaving disabled.\n");
1098         } else {
1099                 switch (check_intlv) {
1100                 case FSL_DDR_256B_INTERLEAVING:
1101                 case FSL_DDR_CACHE_LINE_INTERLEAVING:
1102                 case FSL_DDR_PAGE_INTERLEAVING:
1103                 case FSL_DDR_BANK_INTERLEAVING:
1104                 case FSL_DDR_SUPERBANK_INTERLEAVING:
1105                         if (3 == CONFIG_NUM_DDR_CONTROLLERS)
1106                                 k = 2;
1107                         else
1108                                 k = CONFIG_NUM_DDR_CONTROLLERS;
1109                         break;
1110                 case FSL_DDR_3WAY_1KB_INTERLEAVING:
1111                 case FSL_DDR_3WAY_4KB_INTERLEAVING:
1112                 case FSL_DDR_3WAY_8KB_INTERLEAVING:
1113                 case FSL_DDR_4WAY_1KB_INTERLEAVING:
1114                 case FSL_DDR_4WAY_4KB_INTERLEAVING:
1115                 case FSL_DDR_4WAY_8KB_INTERLEAVING:
1116                 default:
1117                         k = CONFIG_NUM_DDR_CONTROLLERS;
1118                         break;
1119                 }
1120                 debug("%d of %d controllers are interleaving.\n", j, k);
1121                 if (j && (j != k)) {
1122                         for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++)
1123                                 pinfo->memctl_opts[i].memctl_interleaving = 0;
1124                         printf("Not all controllers have compatible "
1125                                 "interleaving mode. All disabled.\n");
1126                 }
1127         }
1128         debug("Checking interleaving options completed\n");
1129 }
1130
1131 int fsl_use_spd(void)
1132 {
1133         int use_spd = 0;
1134
1135 #ifdef CONFIG_DDR_SPD
1136         char buffer[HWCONFIG_BUFFER_SIZE];
1137         char *buf = NULL;
1138
1139         /*
1140          * Extract hwconfig from environment since we have not properly setup
1141          * the environment but need it for ddr config params
1142          */
1143         if (getenv_f("hwconfig", buffer, sizeof(buffer)) > 0)
1144                 buf = buffer;
1145
1146         /* if hwconfig is not enabled, or "sdram" is not defined, use spd */
1147         if (hwconfig_sub_f("fsl_ddr", "sdram", buf)) {
1148                 if (hwconfig_subarg_cmp_f("fsl_ddr", "sdram", "spd", buf))
1149                         use_spd = 1;
1150                 else if (hwconfig_subarg_cmp_f("fsl_ddr", "sdram",
1151                                                "fixed", buf))
1152                         use_spd = 0;
1153                 else
1154                         use_spd = 1;
1155         } else
1156                 use_spd = 1;
1157 #endif
1158
1159         return use_spd;
1160 }