git.sur5r.net Git - u-boot/blob - drivers/ddr/fsl/lc_common_dimm_params.c

   1 /*
   2  * Copyright 2008-2014 Freescale Semiconductor, Inc.
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0
   5  */
   6
   7 #include <common.h>
   8 #include <fsl_ddr_sdram.h>
   9
  10 #include <fsl_ddr.h>
  11
  12 #if defined(CONFIG_SYS_FSL_DDR3) || defined(CONFIG_SYS_FSL_DDR4)
  13 static unsigned int
  14 compute_cas_latency(const unsigned int ctrl_num,
  15                     const dimm_params_t *dimm_params,
  16                     common_timing_params_t *outpdimm,
  17                     unsigned int number_of_dimms)
  18 {
  19         unsigned int i;
  20         unsigned int common_caslat;
  21         unsigned int caslat_actual;
  22         unsigned int retry = 16;
  23         unsigned int tmp = ~0;
  24         const unsigned int mclk_ps = get_memory_clk_period_ps(ctrl_num);
  25 #ifdef CONFIG_SYS_FSL_DDR3
  26         const unsigned int taamax = 20000;
  27 #else
  28         const unsigned int taamax = 18000;
  29 #endif
  30
  31         /* compute the common CAS latency supported between slots */
  32         for (i = 0; i < number_of_dimms; i++) {
  33                 if (dimm_params[i].n_ranks)
  34                         tmp &= dimm_params[i].caslat_x;
  35         }
  36         common_caslat = tmp;
  37
  38         /* validate if the memory clk is in the range of dimms */
  39         if (mclk_ps < outpdimm->tckmin_x_ps) {
  40                 printf("DDR clock (MCLK cycle %u ps) is faster than "
  41                         "the slowest DIMM(s) (tCKmin %u ps) can support.\n",
  42                         mclk_ps, outpdimm->tckmin_x_ps);
  43         }
  44 #ifdef CONFIG_SYS_FSL_DDR4
  45         if (mclk_ps > outpdimm->tckmax_ps) {
  46                 printf("DDR clock (MCLK cycle %u ps) is slower than DIMM(s) (tCKmax %u ps) can support.\n",
  47                        mclk_ps, outpdimm->tckmax_ps);
  48         }
  49 #endif
  50         /* determine the acutal cas latency */
  51         caslat_actual = (outpdimm->taamin_ps + mclk_ps - 1) / mclk_ps;
  52         /* check if the dimms support the CAS latency */
  53         while (!(common_caslat & (1 << caslat_actual)) && retry > 0) {
  54                 caslat_actual++;
  55                 retry--;
  56         }
  57         /* once the caculation of caslat_actual is completed
  58          * we must verify that this CAS latency value does not
  59          * exceed tAAmax, which is 20 ns for all DDR3 speed grades,
  60          * 18ns for all DDR4 speed grades.
  61          */
  62         if (caslat_actual * mclk_ps > taamax) {
  63                 printf("The chosen cas latency %d is too large\n",
  64                        caslat_actual);
  65         }
  66         outpdimm->lowest_common_spd_caslat = caslat_actual;
  67         debug("lowest_common_spd_caslat is 0x%x\n", caslat_actual);
  68
  69         return 0;
  70 }
  71 #else   /* for DDR1 and DDR2 */
  72 static unsigned int
  73 compute_cas_latency(const unsigned int ctrl_num,
  74                     const dimm_params_t *dimm_params,
  75                     common_timing_params_t *outpdimm,
  76                     unsigned int number_of_dimms)
  77 {
  78         int i;
  79         const unsigned int mclk_ps = get_memory_clk_period_ps(ctrl_num);
  80         unsigned int lowest_good_caslat;
  81         unsigned int not_ok;
  82         unsigned int temp1, temp2;
  83
  84         debug("using mclk_ps = %u\n", mclk_ps);
  85         if (mclk_ps > outpdimm->tckmax_ps) {
  86                 printf("Warning: DDR clock (%u ps) is slower than DIMM(s) (tCKmax %u ps)\n",
  87                        mclk_ps, outpdimm->tckmax_ps);
  88         }
  89
  90         /*
  91          * Compute a CAS latency suitable for all DIMMs
  92          *
  93          * Strategy for SPD-defined latencies: compute only
  94          * CAS latency defined by all DIMMs.
  95          */
  96
  97         /*
  98          * Step 1: find CAS latency common to all DIMMs using bitwise
  99          * operation.
 100          */
 101         temp1 = 0xFF;
 102         for (i = 0; i < number_of_dimms; i++) {
 103                 if (dimm_params[i].n_ranks) {
 104                         temp2 = 0;
 105                         temp2 |= 1 << dimm_params[i].caslat_x;
 106                         temp2 |= 1 << dimm_params[i].caslat_x_minus_1;
 107                         temp2 |= 1 << dimm_params[i].caslat_x_minus_2;
 108                         /*
 109                          * If there was no entry for X-2 (X-1) in
 110                          * the SPD, then caslat_x_minus_2
 111                          * (caslat_x_minus_1) contains either 255 or
 112                          * 0xFFFFFFFF because that's what the glorious
 113                          * __ilog2 function returns for an input of 0.
 114                          * On 32-bit PowerPC, left shift counts with bit
 115                          * 26 set (that the value of 255 or 0xFFFFFFFF
 116                          * will have), cause the destination register to
 117                          * be 0.  That is why this works.
 118                          */
 119                         temp1 &= temp2;
 120                 }
 121         }
 122
 123         /*
 124          * Step 2: check each common CAS latency against tCK of each
 125          * DIMM's SPD.
 126          */
 127         lowest_good_caslat = 0;
 128         temp2 = 0;
 129         while (temp1) {
 130                 not_ok = 0;
 131                 temp2 =  __ilog2(temp1);
 132                 debug("checking common caslat = %u\n", temp2);
 133
 134                 /* Check if this CAS latency will work on all DIMMs at tCK. */
 135                 for (i = 0; i < number_of_dimms; i++) {
 136                         if (!dimm_params[i].n_ranks)
 137                                 continue;
 138
 139                         if (dimm_params[i].caslat_x == temp2) {
 140                                 if (mclk_ps >= dimm_params[i].tckmin_x_ps) {
 141                                         debug("CL = %u ok on DIMM %u at tCK=%u ps with tCKmin_X_ps of %u\n",
 142                                               temp2, i, mclk_ps,
 143                                               dimm_params[i].tckmin_x_ps);
 144                                         continue;
 145                                 } else {
 146                                         not_ok++;
 147                                 }
 148                         }
 149
 150                         if (dimm_params[i].caslat_x_minus_1 == temp2) {
 151                                 unsigned int tckmin_x_minus_1_ps
 152                                         = dimm_params[i].tckmin_x_minus_1_ps;
 153                                 if (mclk_ps >= tckmin_x_minus_1_ps) {
 154                                         debug("CL = %u ok on DIMM %u at tCK=%u ps with tckmin_x_minus_1_ps of %u\n",
 155                                               temp2, i, mclk_ps,
 156                                               tckmin_x_minus_1_ps);
 157                                         continue;
 158                                 } else {
 159                                         not_ok++;
 160                                 }
 161                         }
 162
 163                         if (dimm_params[i].caslat_x_minus_2 == temp2) {
 164                                 unsigned int tckmin_x_minus_2_ps
 165                                         = dimm_params[i].tckmin_x_minus_2_ps;
 166                                 if (mclk_ps >= tckmin_x_minus_2_ps) {
 167                                         debug("CL = %u ok on DIMM %u at tCK=%u ps with tckmin_x_minus_2_ps of %u\n",
 168                                               temp2, i, mclk_ps,
 169                                               tckmin_x_minus_2_ps);
 170                                         continue;
 171                                 } else {
 172                                         not_ok++;
 173                                 }
 174                         }
 175                 }
 176
 177                 if (!not_ok)
 178                         lowest_good_caslat = temp2;
 179
 180                 temp1 &= ~(1 << temp2);
 181         }
 182
 183         debug("lowest common SPD-defined CAS latency = %u\n",
 184               lowest_good_caslat);
 185         outpdimm->lowest_common_spd_caslat = lowest_good_caslat;
 186
 187
 188         /*
 189          * Compute a common 'de-rated' CAS latency.
 190          *
 191          * The strategy here is to find the *highest* dereated cas latency
 192          * with the assumption that all of the DIMMs will support a dereated
 193          * CAS latency higher than or equal to their lowest dereated value.
 194          */
 195         temp1 = 0;
 196         for (i = 0; i < number_of_dimms; i++)
 197                 temp1 = max(temp1, dimm_params[i].caslat_lowest_derated);
 198
 199         outpdimm->highest_common_derated_caslat = temp1;
 200         debug("highest common dereated CAS latency = %u\n", temp1);
 201
 202         return 0;
 203 }
 204 #endif
 205
 206 /*
 207  * compute_lowest_common_dimm_parameters()
 208  *
 209  * Determine the worst-case DIMM timing parameters from the set of DIMMs
 210  * whose parameters have been computed into the array pointed to
 211  * by dimm_params.
 212  */
 213 unsigned int
 214 compute_lowest_common_dimm_parameters(const unsigned int ctrl_num,
 215                                       const dimm_params_t *dimm_params,
 216                                       common_timing_params_t *outpdimm,
 217                                       const unsigned int number_of_dimms)
 218 {
 219         unsigned int i, j;
 220
 221         unsigned int tckmin_x_ps = 0;
 222         unsigned int tckmax_ps = 0xFFFFFFFF;
 223         unsigned int trcd_ps = 0;
 224         unsigned int trp_ps = 0;
 225         unsigned int tras_ps = 0;
 226 #if defined(CONFIG_SYS_FSL_DDR3) || defined(CONFIG_SYS_FSL_DDR4)
 227         unsigned int taamin_ps = 0;
 228 #endif
 229 #ifdef CONFIG_SYS_FSL_DDR4
 230         unsigned int twr_ps = 15000;
 231         unsigned int trfc1_ps = 0;
 232         unsigned int trfc2_ps = 0;
 233         unsigned int trfc4_ps = 0;
 234         unsigned int trrds_ps = 0;
 235         unsigned int trrdl_ps = 0;
 236         unsigned int tccdl_ps = 0;
 237 #else
 238         unsigned int twr_ps = 0;
 239         unsigned int twtr_ps = 0;
 240         unsigned int trfc_ps = 0;
 241         unsigned int trrd_ps = 0;
 242         unsigned int trtp_ps = 0;
 243 #endif
 244         unsigned int trc_ps = 0;
 245         unsigned int refresh_rate_ps = 0;
 246         unsigned int extended_op_srt = 1;
 247 #if defined(CONFIG_SYS_FSL_DDR1) || defined(CONFIG_SYS_FSL_DDR2)
 248         unsigned int tis_ps = 0;
 249         unsigned int tih_ps = 0;
 250         unsigned int tds_ps = 0;
 251         unsigned int tdh_ps = 0;
 252         unsigned int tdqsq_max_ps = 0;
 253         unsigned int tqhs_ps = 0;
 254 #endif
 255         unsigned int temp1, temp2;
 256         unsigned int additive_latency = 0;
 257
 258         temp1 = 0;
 259         for (i = 0; i < number_of_dimms; i++) {
 260                 /*
 261                  * If there are no ranks on this DIMM,
 262                  * it probably doesn't exist, so skip it.
 263                  */
 264                 if (dimm_params[i].n_ranks == 0) {
 265                         temp1++;
 266                         continue;
 267                 }
 268                 if (dimm_params[i].n_ranks == 4 && i != 0) {
 269                         printf("Found Quad-rank DIMM in wrong bank, ignored."
 270                                 " Software may not run as expected.\n");
 271                         temp1++;
 272                         continue;
 273                 }
 274
 275                 /*
 276                  * check if quad-rank DIMM is plugged if
 277                  * CONFIG_CHIP_SELECT_QUAD_CAPABLE is not defined
 278                  * Only the board with proper design is capable
 279                  */
 280 #ifndef CONFIG_FSL_DDR_FIRST_SLOT_QUAD_CAPABLE
 281                 if (dimm_params[i].n_ranks == 4 && \
 282                   CONFIG_CHIP_SELECTS_PER_CTRL/CONFIG_DIMM_SLOTS_PER_CTLR < 4) {
 283                         printf("Found Quad-rank DIMM, not able to support.");
 284                         temp1++;
 285                         continue;
 286                 }
 287 #endif
 288                 /*
 289                  * Find minimum tckmax_ps to find fastest slow speed,
 290                  * i.e., this is the slowest the whole system can go.
 291                  */
 292                 tckmax_ps = min(tckmax_ps,
 293                                 (unsigned int)dimm_params[i].tckmax_ps);
 294 #if defined(CONFIG_SYS_FSL_DDR3) || defined(CONFIG_SYS_FSL_DDR4)
 295                 taamin_ps = max(taamin_ps,
 296                                 (unsigned int)dimm_params[i].taa_ps);
 297 #endif
 298                 tckmin_x_ps = max(tckmin_x_ps,
 299                                   (unsigned int)dimm_params[i].tckmin_x_ps);
 300                 trcd_ps = max(trcd_ps, (unsigned int)dimm_params[i].trcd_ps);
 301                 trp_ps = max(trp_ps, (unsigned int)dimm_params[i].trp_ps);
 302                 tras_ps = max(tras_ps, (unsigned int)dimm_params[i].tras_ps);
 303 #ifdef CONFIG_SYS_FSL_DDR4
 304                 trfc1_ps = max(trfc1_ps,
 305                                (unsigned int)dimm_params[i].trfc1_ps);
 306                 trfc2_ps = max(trfc2_ps,
 307                                (unsigned int)dimm_params[i].trfc2_ps);
 308                 trfc4_ps = max(trfc4_ps,
 309                                (unsigned int)dimm_params[i].trfc4_ps);
 310                 trrds_ps = max(trrds_ps,
 311                                (unsigned int)dimm_params[i].trrds_ps);
 312                 trrdl_ps = max(trrdl_ps,
 313                                (unsigned int)dimm_params[i].trrdl_ps);
 314                 tccdl_ps = max(tccdl_ps,
 315                                (unsigned int)dimm_params[i].tccdl_ps);
 316 #else
 317                 twr_ps = max(twr_ps, (unsigned int)dimm_params[i].twr_ps);
 318                 twtr_ps = max(twtr_ps, (unsigned int)dimm_params[i].twtr_ps);
 319                 trfc_ps = max(trfc_ps, (unsigned int)dimm_params[i].trfc_ps);
 320                 trrd_ps = max(trrd_ps, (unsigned int)dimm_params[i].trrd_ps);
 321                 trtp_ps = max(trtp_ps, (unsigned int)dimm_params[i].trtp_ps);
 322 #endif
 323                 trc_ps = max(trc_ps, (unsigned int)dimm_params[i].trc_ps);
 324 #if defined(CONFIG_SYS_FSL_DDR1) || defined(CONFIG_SYS_FSL_DDR2)
 325                 tis_ps = max(tis_ps, (unsigned int)dimm_params[i].tis_ps);
 326                 tih_ps = max(tih_ps, (unsigned int)dimm_params[i].tih_ps);
 327                 tds_ps = max(tds_ps, (unsigned int)dimm_params[i].tds_ps);
 328                 tdh_ps = max(tdh_ps, (unsigned int)dimm_params[i].tdh_ps);
 329                 tqhs_ps = max(tqhs_ps, (unsigned int)dimm_params[i].tqhs_ps);
 330                 /*
 331                  * Find maximum tdqsq_max_ps to find slowest.
 332                  *
 333                  * FIXME: is finding the slowest value the correct
 334                  * strategy for this parameter?
 335                  */
 336                 tdqsq_max_ps = max(tdqsq_max_ps,
 337                                    (unsigned int)dimm_params[i].tdqsq_max_ps);
 338 #endif
 339                 refresh_rate_ps = max(refresh_rate_ps,
 340                                       (unsigned int)dimm_params[i].refresh_rate_ps);
 341                 /* extended_op_srt is either 0 or 1, 0 having priority */
 342                 extended_op_srt = min(extended_op_srt,
 343                                       (unsigned int)dimm_params[i].extended_op_srt);
 344         }
 345
 346         outpdimm->ndimms_present = number_of_dimms - temp1;
 347
 348         if (temp1 == number_of_dimms) {
 349                 debug("no dimms this memory controller\n");
 350                 return 0;
 351         }
 352
 353         outpdimm->tckmin_x_ps = tckmin_x_ps;
 354         outpdimm->tckmax_ps = tckmax_ps;
 355 #if defined(CONFIG_SYS_FSL_DDR3) || defined(CONFIG_SYS_FSL_DDR4)
 356         outpdimm->taamin_ps = taamin_ps;
 357 #endif
 358         outpdimm->trcd_ps = trcd_ps;
 359         outpdimm->trp_ps = trp_ps;
 360         outpdimm->tras_ps = tras_ps;
 361 #ifdef CONFIG_SYS_FSL_DDR4
 362         outpdimm->trfc1_ps = trfc1_ps;
 363         outpdimm->trfc2_ps = trfc2_ps;
 364         outpdimm->trfc4_ps = trfc4_ps;
 365         outpdimm->trrds_ps = trrds_ps;
 366         outpdimm->trrdl_ps = trrdl_ps;
 367         outpdimm->tccdl_ps = tccdl_ps;
 368 #else
 369         outpdimm->twtr_ps = twtr_ps;
 370         outpdimm->trfc_ps = trfc_ps;
 371         outpdimm->trrd_ps = trrd_ps;
 372         outpdimm->trtp_ps = trtp_ps;
 373 #endif
 374         outpdimm->twr_ps = twr_ps;
 375         outpdimm->trc_ps = trc_ps;
 376         outpdimm->refresh_rate_ps = refresh_rate_ps;
 377         outpdimm->extended_op_srt = extended_op_srt;
 378 #if defined(CONFIG_SYS_FSL_DDR1) || defined(CONFIG_SYS_FSL_DDR2)
 379         outpdimm->tis_ps = tis_ps;
 380         outpdimm->tih_ps = tih_ps;
 381         outpdimm->tds_ps = tds_ps;
 382         outpdimm->tdh_ps = tdh_ps;
 383         outpdimm->tdqsq_max_ps = tdqsq_max_ps;
 384         outpdimm->tqhs_ps = tqhs_ps;
 385 #endif
 386
 387         /* Determine common burst length for all DIMMs. */
 388         temp1 = 0xff;
 389         for (i = 0; i < number_of_dimms; i++) {
 390                 if (dimm_params[i].n_ranks) {
 391                         temp1 &= dimm_params[i].burst_lengths_bitmask;
 392                 }
 393         }
 394         outpdimm->all_dimms_burst_lengths_bitmask = temp1;
 395
 396         /* Determine if all DIMMs registered buffered. */
 397         temp1 = temp2 = 0;
 398         for (i = 0; i < number_of_dimms; i++) {
 399                 if (dimm_params[i].n_ranks) {
 400                         if (dimm_params[i].registered_dimm) {
 401                                 temp1 = 1;
 402 #ifndef CONFIG_SPL_BUILD
 403                                 printf("Detected RDIMM %s\n",
 404                                         dimm_params[i].mpart);
 405 #endif
 406                         } else {
 407                                 temp2 = 1;
 408 #ifndef CONFIG_SPL_BUILD
 409                                 printf("Detected UDIMM %s\n",
 410                                         dimm_params[i].mpart);
 411 #endif
 412                         }
 413                 }
 414         }
 415
 416         outpdimm->all_dimms_registered = 0;
 417         outpdimm->all_dimms_unbuffered = 0;
 418         if (temp1 && !temp2) {
 419                 outpdimm->all_dimms_registered = 1;
 420         } else if (!temp1 && temp2) {
 421                 outpdimm->all_dimms_unbuffered = 1;
 422         } else {
 423                 printf("ERROR:  Mix of registered buffered and unbuffered "
 424                                 "DIMMs detected!\n");
 425         }
 426
 427         temp1 = 0;
 428         if (outpdimm->all_dimms_registered)
 429                 for (j = 0; j < 16; j++) {
 430                         outpdimm->rcw[j] = dimm_params[0].rcw[j];
 431                         for (i = 1; i < number_of_dimms; i++) {
 432                                 if (!dimm_params[i].n_ranks)
 433                                         continue;
 434                                 if (dimm_params[i].rcw[j] != dimm_params[0].rcw[j]) {
 435                                         temp1 = 1;
 436                                         break;
 437                                 }
 438                         }
 439                 }
 440
 441         if (temp1 != 0)
 442                 printf("ERROR: Mix different RDIMM detected!\n");
 443
 444         /* calculate cas latency for all DDR types */
 445         if (compute_cas_latency(ctrl_num, dimm_params,
 446                                 outpdimm, number_of_dimms))
 447                 return 1;
 448
 449         /* Determine if all DIMMs ECC capable. */
 450         temp1 = 1;
 451         for (i = 0; i < number_of_dimms; i++) {
 452                 if (dimm_params[i].n_ranks &&
 453                         !(dimm_params[i].edc_config & EDC_ECC)) {
 454                         temp1 = 0;
 455                         break;
 456                 }
 457         }
 458         if (temp1) {
 459                 debug("all DIMMs ECC capable\n");
 460         } else {
 461                 debug("Warning: not all DIMMs ECC capable, cant enable ECC\n");
 462         }
 463         outpdimm->all_dimms_ecc_capable = temp1;
 464
 465         /*
 466          * Compute additive latency.
 467          *
 468          * For DDR1, additive latency should be 0.
 469          *
 470          * For DDR2, with ODT enabled, use "a value" less than ACTTORW,
 471          *      which comes from Trcd, and also note that:
 472          *          add_lat + caslat must be >= 4
 473          *
 474          * For DDR3, we use the AL=0
 475          *
 476          * When to use additive latency for DDR2:
 477          *
 478          * I. Because you are using CL=3 and need to do ODT on writes and
 479          *    want functionality.
 480          *    1. Are you going to use ODT? (Does your board not have
 481          *      additional termination circuitry for DQ, DQS, DQS_,
 482          *      DM, RDQS, RDQS_ for x4/x8 configs?)
 483          *    2. If so, is your lowest supported CL going to be 3?
 484          *    3. If so, then you must set AL=1 because
 485          *
 486          *       WL >= 3 for ODT on writes
 487          *       RL = AL + CL
 488          *       WL = RL - 1
 489          *       ->
 490          *       WL = AL + CL - 1
 491          *       AL + CL - 1 >= 3
 492          *       AL + CL >= 4
 493          *  QED
 494          *
 495          *  RL >= 3 for ODT on reads
 496          *  RL = AL + CL
 497          *
 498          *  Since CL aren't usually less than 2, AL=0 is a minimum,
 499          *  so the WL-derived AL should be the  -- FIXME?
 500          *
 501          * II. Because you are using auto-precharge globally and want to
 502          *     use additive latency (posted CAS) to get more bandwidth.
 503          *     1. Are you going to use auto-precharge mode globally?
 504          *
 505          *        Use addtivie latency and compute AL to be 1 cycle less than
 506          *        tRCD, i.e. the READ or WRITE command is in the cycle
 507          *        immediately following the ACTIVATE command..
 508          *
 509          * III. Because you feel like it or want to do some sort of
 510          *      degraded-performance experiment.
 511          *     1.  Do you just want to use additive latency because you feel
 512          *         like it?
 513          *
 514          * Validation:  AL is less than tRCD, and within the other
 515          * read-to-precharge constraints.
 516          */
 517
 518         additive_latency = 0;
 519
 520 #if defined(CONFIG_SYS_FSL_DDR2)
 521         if ((outpdimm->lowest_common_spd_caslat < 4) &&
 522             (picos_to_mclk(ctrl_num, trcd_ps) >
 523              outpdimm->lowest_common_spd_caslat)) {
 524                 additive_latency = picos_to_mclk(ctrl_num, trcd_ps) -
 525                                    outpdimm->lowest_common_spd_caslat;
 526                 if (mclk_to_picos(ctrl_num, additive_latency) > trcd_ps) {
 527                         additive_latency = picos_to_mclk(ctrl_num, trcd_ps);
 528                         debug("setting additive_latency to %u because it was "
 529                                 " greater than tRCD_ps\n", additive_latency);
 530                 }
 531         }
 532 #endif
 533
 534         /*
 535          * Validate additive latency
 536          *
 537          * AL <= tRCD(min)
 538          */
 539         if (mclk_to_picos(ctrl_num, additive_latency) > trcd_ps) {
 540                 printf("Error: invalid additive latency exceeds tRCD(min).\n");
 541                 return 1;
 542         }
 543
 544         /*
 545          * RL = CL + AL;  RL >= 3 for ODT_RD_CFG to be enabled
 546          * WL = RL - 1;  WL >= 3 for ODT_WL_CFG to be enabled
 547          * ADD_LAT (the register) must be set to a value less
 548          * than ACTTORW if WL = 1, then AL must be set to 1
 549          * RD_TO_PRE (the register) must be set to a minimum
 550          * tRTP + AL if AL is nonzero
 551          */
 552
 553         /*
 554          * Additive latency will be applied only if the memctl option to
 555          * use it.
 556          */
 557         outpdimm->additive_latency = additive_latency;
 558
 559         debug("tCKmin_ps = %u\n", outpdimm->tckmin_x_ps);
 560         debug("trcd_ps   = %u\n", outpdimm->trcd_ps);
 561         debug("trp_ps    = %u\n", outpdimm->trp_ps);
 562         debug("tras_ps   = %u\n", outpdimm->tras_ps);
 563 #ifdef CONFIG_SYS_FSL_DDR4
 564         debug("trfc1_ps = %u\n", trfc1_ps);
 565         debug("trfc2_ps = %u\n", trfc2_ps);
 566         debug("trfc4_ps = %u\n", trfc4_ps);
 567         debug("trrds_ps = %u\n", trrds_ps);
 568         debug("trrdl_ps = %u\n", trrdl_ps);
 569         debug("tccdl_ps = %u\n", tccdl_ps);
 570 #else
 571         debug("twtr_ps   = %u\n", outpdimm->twtr_ps);
 572         debug("trfc_ps   = %u\n", outpdimm->trfc_ps);
 573         debug("trrd_ps   = %u\n", outpdimm->trrd_ps);
 574 #endif
 575         debug("twr_ps    = %u\n", outpdimm->twr_ps);
 576         debug("trc_ps    = %u\n", outpdimm->trc_ps);
 577
 578         return 0;
 579 }