arch/powerpc/cpu/mpc8xxx/ddr/main.c

   1 /*
   2  * Copyright 2008-2012 Freescale Semiconductor, Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * Version 2 as published by the Free Software Foundation.
   7  */
   8
   9 /*
  10  * Generic driver for Freescale DDR/DDR2/DDR3 memory controller.
  11  * Based on code from spd_sdram.c
  12  * Author: James Yang [at freescale.com]
  13  */
  14
  15 #include <common.h>
  16 #include <i2c.h>
  17 #include <asm/fsl_ddr_sdram.h>
  18 #include <asm/fsl_law.h>
  19
  20 #include "ddr.h"
  21
  22 void fsl_ddr_set_lawbar(
  23                 const common_timing_params_t *memctl_common_params,
  24                 unsigned int memctl_interleaved,
  25                 unsigned int ctrl_num);
  26 void fsl_ddr_set_intl3r(const unsigned int granule_size);
  27
  28 #if defined(SPD_EEPROM_ADDRESS) || \
  29     defined(SPD_EEPROM_ADDRESS1) || defined(SPD_EEPROM_ADDRESS2) || \
  30     defined(SPD_EEPROM_ADDRESS3) || defined(SPD_EEPROM_ADDRESS4)
  31 #if (CONFIG_NUM_DDR_CONTROLLERS == 1) && (CONFIG_DIMM_SLOTS_PER_CTLR == 1)
  32 u8 spd_i2c_addr[CONFIG_NUM_DDR_CONTROLLERS][CONFIG_DIMM_SLOTS_PER_CTLR] = {
  33         [0][0] = SPD_EEPROM_ADDRESS,
  34 };
  35 #elif (CONFIG_NUM_DDR_CONTROLLERS == 1) && (CONFIG_DIMM_SLOTS_PER_CTLR == 2)
  36 u8 spd_i2c_addr[CONFIG_NUM_DDR_CONTROLLERS][CONFIG_DIMM_SLOTS_PER_CTLR] = {
  37         [0][0] = SPD_EEPROM_ADDRESS1,   /* controller 1 */
  38         [0][1] = SPD_EEPROM_ADDRESS2,   /* controller 1 */
  39 };
  40 #elif (CONFIG_NUM_DDR_CONTROLLERS == 2) && (CONFIG_DIMM_SLOTS_PER_CTLR == 1)
  41 u8 spd_i2c_addr[CONFIG_NUM_DDR_CONTROLLERS][CONFIG_DIMM_SLOTS_PER_CTLR] = {
  42         [0][0] = SPD_EEPROM_ADDRESS1,   /* controller 1 */
  43         [1][0] = SPD_EEPROM_ADDRESS2,   /* controller 2 */
  44 };
  45 #elif (CONFIG_NUM_DDR_CONTROLLERS == 2) && (CONFIG_DIMM_SLOTS_PER_CTLR == 2)
  46 u8 spd_i2c_addr[CONFIG_NUM_DDR_CONTROLLERS][CONFIG_DIMM_SLOTS_PER_CTLR] = {
  47         [0][0] = SPD_EEPROM_ADDRESS1,   /* controller 1 */
  48         [0][1] = SPD_EEPROM_ADDRESS2,   /* controller 1 */
  49         [1][0] = SPD_EEPROM_ADDRESS3,   /* controller 2 */
  50         [1][1] = SPD_EEPROM_ADDRESS4,   /* controller 2 */
  51 };
  52 #elif (CONFIG_NUM_DDR_CONTROLLERS == 3) && (CONFIG_DIMM_SLOTS_PER_CTLR == 1)
  53 u8 spd_i2c_addr[CONFIG_NUM_DDR_CONTROLLERS][CONFIG_DIMM_SLOTS_PER_CTLR] = {
  54         [0][0] = SPD_EEPROM_ADDRESS1,   /* controller 1 */
  55         [1][0] = SPD_EEPROM_ADDRESS2,   /* controller 2 */
  56         [2][0] = SPD_EEPROM_ADDRESS3,   /* controller 3 */
  57 };
  58 #elif (CONFIG_NUM_DDR_CONTROLLERS == 3) && (CONFIG_DIMM_SLOTS_PER_CTLR == 2)
  59 u8 spd_i2c_addr[CONFIG_NUM_DDR_CONTROLLERS][CONFIG_DIMM_SLOTS_PER_CTLR] = {
  60         [0][0] = SPD_EEPROM_ADDRESS1,   /* controller 1 */
  61         [0][1] = SPD_EEPROM_ADDRESS2,   /* controller 1 */
  62         [1][0] = SPD_EEPROM_ADDRESS3,   /* controller 2 */
  63         [1][1] = SPD_EEPROM_ADDRESS4,   /* controller 2 */
  64         [2][0] = SPD_EEPROM_ADDRESS5,   /* controller 3 */
  65         [2][1] = SPD_EEPROM_ADDRESS6,   /* controller 3 */
  66 };
  67
  68 #endif
  69
  70 static void __get_spd(generic_spd_eeprom_t *spd, u8 i2c_address)
  71 {
  72         int ret;
  73
  74         i2c_set_bus_num(CONFIG_SYS_SPD_BUS_NUM);
  75
  76         ret = i2c_read(i2c_address, 0, 1, (uchar *)spd,
  77                                 sizeof(generic_spd_eeprom_t));
  78
  79         if (ret) {
  80                 if (i2c_address ==
  81 #ifdef SPD_EEPROM_ADDRESS
  82                                 SPD_EEPROM_ADDRESS
  83 #elif defined(SPD_EEPROM_ADDRESS1)
  84                                 SPD_EEPROM_ADDRESS1
  85 #endif
  86                                 ) {
  87                         printf("DDR: failed to read SPD from address %u\n",
  88                                 i2c_address);
  89                 } else {
  90                         debug("DDR: failed to read SPD from address %u\n",
  91                                 i2c_address);
  92                 }
  93                 memset(spd, 0, sizeof(generic_spd_eeprom_t));
  94         }
  95 }
  96
  97 __attribute__((weak, alias("__get_spd")))
  98 void get_spd(generic_spd_eeprom_t *spd, u8 i2c_address);
  99
 100 void fsl_ddr_get_spd(generic_spd_eeprom_t *ctrl_dimms_spd,
 101                       unsigned int ctrl_num)
 102 {
 103         unsigned int i;
 104         unsigned int i2c_address = 0;
 105
 106         if (ctrl_num >= CONFIG_NUM_DDR_CONTROLLERS) {
 107                 printf("%s unexpected ctrl_num = %u\n", __FUNCTION__, ctrl_num);
 108                 return;
 109         }
 110
 111         for (i = 0; i < CONFIG_DIMM_SLOTS_PER_CTLR; i++) {
 112                 i2c_address = spd_i2c_addr[ctrl_num][i];
 113                 get_spd(&(ctrl_dimms_spd[i]), i2c_address);
 114         }
 115 }
 116 #else
 117 void fsl_ddr_get_spd(generic_spd_eeprom_t *ctrl_dimms_spd,
 118                       unsigned int ctrl_num)
 119 {
 120 }
 121 #endif /* SPD_EEPROM_ADDRESSx */
 122
 123 /*
 124  * ASSUMPTIONS:
 125  *    - Same number of CONFIG_DIMM_SLOTS_PER_CTLR on each controller
 126  *    - Same memory data bus width on all controllers
 127  *
 128  * NOTES:
 129  *
 130  * The memory controller and associated documentation use confusing
 131  * terminology when referring to the orgranization of DRAM.
 132  *
 133  * Here is a terminology translation table:
 134  *
 135  * memory controller/documention  |industry   |this code  |signals
 136  * -------------------------------|-----------|-----------|-----------------
 137  * physical bank/bank             |rank       |rank       |chip select (CS)
 138  * logical bank/sub-bank          |bank       |bank       |bank address (BA)
 139  * page/row                       |row        |page       |row address
 140  * ???                            |column     |column     |column address
 141  *
 142  * The naming confusion is further exacerbated by the descriptions of the
 143  * memory controller interleaving feature, where accesses are interleaved
 144  * _BETWEEN_ two seperate memory controllers.  This is configured only in
 145  * CS0_CONFIG[INTLV_CTL] of each memory controller.
 146  *
 147  * memory controller documentation | number of chip selects
 148  *                                 | per memory controller supported
 149  * --------------------------------|-----------------------------------------
 150  * cache line interleaving         | 1 (CS0 only)
 151  * page interleaving               | 1 (CS0 only)
 152  * bank interleaving               | 1 (CS0 only)
 153  * superbank interleraving         | depends on bank (chip select)
 154  *                                 |   interleraving [rank interleaving]
 155  *                                 |   mode used on every memory controller
 156  *
 157  * Even further confusing is the existence of the interleaving feature
 158  * _WITHIN_ each memory controller.  The feature is referred to in
 159  * documentation as chip select interleaving or bank interleaving,
 160  * although it is configured in the DDR_SDRAM_CFG field.
 161  *
 162  * Name of field                | documentation name    | this code
 163  * -----------------------------|-----------------------|------------------
 164  * DDR_SDRAM_CFG[BA_INTLV_CTL]  | Bank (chip select)    | rank interleaving
 165  *                              |  interleaving
 166  */
 167
 168 const char *step_string_tbl[] = {
 169         "STEP_GET_SPD",
 170         "STEP_COMPUTE_DIMM_PARMS",
 171         "STEP_COMPUTE_COMMON_PARMS",
 172         "STEP_GATHER_OPTS",
 173         "STEP_ASSIGN_ADDRESSES",
 174         "STEP_COMPUTE_REGS",
 175         "STEP_PROGRAM_REGS",
 176         "STEP_ALL"
 177 };
 178
 179 const char * step_to_string(unsigned int step) {
 180
 181         unsigned int s = __ilog2(step);
 182
 183         if ((1 << s) != step)
 184                 return step_string_tbl[7];
 185
 186         return step_string_tbl[s];
 187 }
 188
 189 static unsigned long long __step_assign_addresses(fsl_ddr_info_t *pinfo,
 190                           unsigned int dbw_cap_adj[])
 191 {
 192         int i, j;
 193         unsigned long long total_mem, current_mem_base, total_ctlr_mem;
 194         unsigned long long rank_density, ctlr_density = 0;
 195
 196         /*
 197          * If a reduced data width is requested, but the SPD
 198          * specifies a physically wider device, adjust the
 199          * computed dimm capacities accordingly before
 200          * assigning addresses.
 201          */
 202         for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
 203                 unsigned int found = 0;
 204
 205                 switch (pinfo->memctl_opts[i].data_bus_width) {
 206                 case 2:
 207                         /* 16-bit */
 208                         for (j = 0; j < CONFIG_DIMM_SLOTS_PER_CTLR; j++) {
 209                                 unsigned int dw;
 210                                 if (!pinfo->dimm_params[i][j].n_ranks)
 211                                         continue;
 212                                 dw = pinfo->dimm_params[i][j].primary_sdram_width;
 213                                 if ((dw == 72 || dw == 64)) {
 214                                         dbw_cap_adj[i] = 2;
 215                                         break;
 216                                 } else if ((dw == 40 || dw == 32)) {
 217                                         dbw_cap_adj[i] = 1;
 218                                         break;
 219                                 }
 220                         }
 221                         break;
 222
 223                 case 1:
 224                         /* 32-bit */
 225                         for (j = 0; j < CONFIG_DIMM_SLOTS_PER_CTLR; j++) {
 226                                 unsigned int dw;
 227                                 dw = pinfo->dimm_params[i][j].data_width;
 228                                 if (pinfo->dimm_params[i][j].n_ranks
 229                                     && (dw == 72 || dw == 64)) {
 230                                         /*
 231                                          * FIXME: can't really do it
 232                                          * like this because this just
 233                                          * further reduces the memory
 234                                          */
 235                                         found = 1;
 236                                         break;
 237                                 }
 238                         }
 239                         if (found) {
 240                                 dbw_cap_adj[i] = 1;
 241                         }
 242                         break;
 243
 244                 case 0:
 245                         /* 64-bit */
 246                         break;
 247
 248                 default:
 249                         printf("unexpected data bus width "
 250                                 "specified controller %u\n", i);
 251                         return 1;
 252                 }
 253                 debug("dbw_cap_adj[%d]=%d\n", i, dbw_cap_adj[i]);
 254         }
 255
 256         current_mem_base = 0ull;
 257         total_mem = 0;
 258         if (pinfo->memctl_opts[0].memctl_interleaving) {
 259                 rank_density = pinfo->dimm_params[0][0].rank_density >>
 260                                         dbw_cap_adj[0];
 261                 switch (pinfo->memctl_opts[0].ba_intlv_ctl &
 262                                         FSL_DDR_CS0_CS1_CS2_CS3) {
 263                 case FSL_DDR_CS0_CS1_CS2_CS3:
 264                         ctlr_density = 4 * rank_density;
 265                         break;
 266                 case FSL_DDR_CS0_CS1:
 267                 case FSL_DDR_CS0_CS1_AND_CS2_CS3:
 268                         ctlr_density = 2 * rank_density;
 269                         break;
 270                 case FSL_DDR_CS2_CS3:
 271                 default:
 272                         ctlr_density = rank_density;
 273                         break;
 274                 }
 275                 debug("rank density is 0x%llx, ctlr density is 0x%llx\n",
 276                         rank_density, ctlr_density);
 277                 for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
 278                         if (pinfo->memctl_opts[i].memctl_interleaving) {
 279                                 switch (pinfo->memctl_opts[i].memctl_interleaving_mode) {
 280                                 case FSL_DDR_CACHE_LINE_INTERLEAVING:
 281                                 case FSL_DDR_PAGE_INTERLEAVING:
 282                                 case FSL_DDR_BANK_INTERLEAVING:
 283                                 case FSL_DDR_SUPERBANK_INTERLEAVING:
 284                                         total_ctlr_mem = 2 * ctlr_density;
 285                                         break;
 286                                 case FSL_DDR_3WAY_1KB_INTERLEAVING:
 287                                 case FSL_DDR_3WAY_4KB_INTERLEAVING:
 288                                 case FSL_DDR_3WAY_8KB_INTERLEAVING:
 289                                         total_ctlr_mem = 3 * ctlr_density;
 290                                         break;
 291                                 case FSL_DDR_4WAY_1KB_INTERLEAVING:
 292                                 case FSL_DDR_4WAY_4KB_INTERLEAVING:
 293                                 case FSL_DDR_4WAY_8KB_INTERLEAVING:
 294                                         total_ctlr_mem = 4 * ctlr_density;
 295                                         break;
 296                                 default:
 297                                         panic("Unknown interleaving mode");
 298                                 }
 299                                 pinfo->common_timing_params[i].base_address =
 300                                                         current_mem_base;
 301                                 pinfo->common_timing_params[i].total_mem =
 302                                                         total_ctlr_mem;
 303                                 total_mem = current_mem_base + total_ctlr_mem;
 304                                 debug("ctrl %d base 0x%llx\n", i, current_mem_base);
 305                                 debug("ctrl %d total 0x%llx\n", i, total_ctlr_mem);
 306                         } else {
 307                                 /* when 3rd controller not interleaved */
 308                                 current_mem_base = total_mem;
 309                                 total_ctlr_mem = 0;
 310                                 pinfo->common_timing_params[i].base_address =
 311                                                         current_mem_base;
 312                                 for (j = 0; j < CONFIG_DIMM_SLOTS_PER_CTLR; j++) {
 313                                         unsigned long long cap =
 314                                                 pinfo->dimm_params[i][j].capacity >> dbw_cap_adj[i];
 315                                         pinfo->dimm_params[i][j].base_address =
 316                                                 current_mem_base;
 317                                         debug("ctrl %d dimm %d base 0x%llx\n", i, j, current_mem_base);
 318                                         current_mem_base += cap;
 319                                         total_ctlr_mem += cap;
 320                                 }
 321                                 debug("ctrl %d total 0x%llx\n", i, total_ctlr_mem);
 322                                 pinfo->common_timing_params[i].total_mem =
 323                                                         total_ctlr_mem;
 324                                 total_mem += total_ctlr_mem;
 325                         }
 326                 }
 327         } else {
 328                 /*
 329                  * Simple linear assignment if memory
 330                  * controllers are not interleaved.
 331                  */
 332                 for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
 333                         total_ctlr_mem = 0;
 334                         pinfo->common_timing_params[i].base_address =
 335                                                 current_mem_base;
 336                         for (j = 0; j < CONFIG_DIMM_SLOTS_PER_CTLR; j++) {
 337                                 /* Compute DIMM base addresses. */
 338                                 unsigned long long cap =
 339                                         pinfo->dimm_params[i][j].capacity >> dbw_cap_adj[i];
 340                                 pinfo->dimm_params[i][j].base_address =
 341                                         current_mem_base;
 342                                 debug("ctrl %d dimm %d base 0x%llx\n", i, j, current_mem_base);
 343                                 current_mem_base += cap;
 344                                 total_ctlr_mem += cap;
 345                         }
 346                         debug("ctrl %d total 0x%llx\n", i, total_ctlr_mem);
 347                         pinfo->common_timing_params[i].total_mem =
 348                                                         total_ctlr_mem;
 349                         total_mem += total_ctlr_mem;
 350                 }
 351         }
 352         debug("Total mem by %s is 0x%llx\n", __func__, total_mem);
 353
 354         return total_mem;
 355 }
 356
 357 /* Use weak function to allow board file to override the address assignment */
 358 __attribute__((weak, alias("__step_assign_addresses")))
 359 unsigned long long step_assign_addresses(fsl_ddr_info_t *pinfo,
 360                           unsigned int dbw_cap_adj[]);
 361
 362 unsigned long long
 363 fsl_ddr_compute(fsl_ddr_info_t *pinfo, unsigned int start_step,
 364                                        unsigned int size_only)
 365 {
 366         unsigned int i, j;
 367         unsigned long long total_mem = 0;
 368         int assert_reset;
 369
 370         fsl_ddr_cfg_regs_t *ddr_reg = pinfo->fsl_ddr_config_reg;
 371         common_timing_params_t *timing_params = pinfo->common_timing_params;
 372         assert_reset = board_need_mem_reset();
 373
 374         /* data bus width capacity adjust shift amount */
 375         unsigned int dbw_capacity_adjust[CONFIG_NUM_DDR_CONTROLLERS];
 376
 377         for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
 378                 dbw_capacity_adjust[i] = 0;
 379         }
 380
 381         debug("starting at step %u (%s)\n",
 382               start_step, step_to_string(start_step));
 383
 384         switch (start_step) {
 385         case STEP_GET_SPD:
 386 #if defined(CONFIG_DDR_SPD) || defined(CONFIG_SPD_EEPROM)
 387                 /* STEP 1:  Gather all DIMM SPD data */
 388                 for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
 389                         fsl_ddr_get_spd(pinfo->spd_installed_dimms[i], i);
 390                 }
 391
 392         case STEP_COMPUTE_DIMM_PARMS:
 393                 /* STEP 2:  Compute DIMM parameters from SPD data */
 394
 395                 for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
 396                         for (j = 0; j < CONFIG_DIMM_SLOTS_PER_CTLR; j++) {
 397                                 unsigned int retval;
 398                                 generic_spd_eeprom_t *spd =
 399                                         &(pinfo->spd_installed_dimms[i][j]);
 400                                 dimm_params_t *pdimm =
 401                                         &(pinfo->dimm_params[i][j]);
 402
 403                                 retval = compute_dimm_parameters(spd, pdimm, i);
 404 #ifdef CONFIG_SYS_DDR_RAW_TIMING
 405                                 if (!i && !j && retval) {
 406                                         printf("SPD error on controller %d! "
 407                                         "Trying fallback to raw timing "
 408                                         "calculation\n", i);
 409                                         fsl_ddr_get_dimm_params(pdimm, i, j);
 410                                 }
 411 #else
 412                                 if (retval == 2) {
 413                                         printf("Error: compute_dimm_parameters"
 414                                         " non-zero returned FATAL value "
 415                                         "for memctl=%u dimm=%u\n", i, j);
 416                                         return 0;
 417                                 }
 418 #endif
 419                                 if (retval) {
 420                                         debug("Warning: compute_dimm_parameters"
 421                                         " non-zero return value for memctl=%u "
 422                                         "dimm=%u\n", i, j);
 423                                 }
 424                         }
 425                 }
 426
 427 #elif defined(CONFIG_SYS_DDR_RAW_TIMING)
 428         case STEP_COMPUTE_DIMM_PARMS:
 429                 for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
 430                         for (j = 0; j < CONFIG_DIMM_SLOTS_PER_CTLR; j++) {
 431                                 dimm_params_t *pdimm =
 432                                         &(pinfo->dimm_params[i][j]);
 433                                 fsl_ddr_get_dimm_params(pdimm, i, j);
 434                         }
 435                 }
 436                 debug("Filling dimm parameters from board specific file\n");
 437 #endif
 438         case STEP_COMPUTE_COMMON_PARMS:
 439                 /*
 440                  * STEP 3: Compute a common set of timing parameters
 441                  * suitable for all of the DIMMs on each memory controller
 442                  */
 443                 for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
 444                         debug("Computing lowest common DIMM"
 445                                 " parameters for memctl=%u\n", i);
 446                         compute_lowest_common_dimm_parameters(
 447                                 pinfo->dimm_params[i],
 448                                 &timing_params[i],
 449                                 CONFIG_DIMM_SLOTS_PER_CTLR);
 450                 }
 451
 452         case STEP_GATHER_OPTS:
 453                 /* STEP 4:  Gather configuration requirements from user */
 454                 for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
 455                         debug("Reloading memory controller "
 456                                 "configuration options for memctl=%u\n", i);
 457                         /*
 458                          * This "reloads" the memory controller options
 459                          * to defaults.  If the user "edits" an option,
 460                          * next_step points to the step after this,
 461                          * which is currently STEP_ASSIGN_ADDRESSES.
 462                          */
 463                         populate_memctl_options(
 464                                         timing_params[i].all_dimms_registered,
 465                                         &pinfo->memctl_opts[i],
 466                                         pinfo->dimm_params[i], i);
 467                         /*
 468                          * For RDIMMs, JEDEC spec requires clocks to be stable
 469                          * before reset signal is deasserted. For the boards
 470                          * using fixed parameters, this function should be
 471                          * be called from board init file.
 472                          */
 473                         if (timing_params[i].all_dimms_registered)
 474                                 assert_reset = 1;
 475                 }
 476                 if (assert_reset) {
 477                         debug("Asserting mem reset\n");
 478                         board_assert_mem_reset();
 479                 }
 480
 481         case STEP_ASSIGN_ADDRESSES:
 482                 /* STEP 5:  Assign addresses to chip selects */
 483                 check_interleaving_options(pinfo);
 484                 total_mem = step_assign_addresses(pinfo, dbw_capacity_adjust);
 485
 486         case STEP_COMPUTE_REGS:
 487                 /* STEP 6:  compute controller register values */
 488                 debug("FSL Memory ctrl register computation\n");
 489                 for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
 490                         if (timing_params[i].ndimms_present == 0) {
 491                                 memset(&ddr_reg[i], 0,
 492                                         sizeof(fsl_ddr_cfg_regs_t));
 493                                 continue;
 494                         }
 495
 496                         compute_fsl_memctl_config_regs(
 497                                         &pinfo->memctl_opts[i],
 498                                         &ddr_reg[i], &timing_params[i],
 499                                         pinfo->dimm_params[i],
 500                                         dbw_capacity_adjust[i],
 501                                         size_only);
 502                 }
 503
 504         default:
 505                 break;
 506         }
 507
 508         {
 509                 /*
 510                  * Compute the amount of memory available just by
 511                  * looking for the highest valid CSn_BNDS value.
 512                  * This allows us to also experiment with using
 513                  * only CS0 when using dual-rank DIMMs.
 514                  */
 515                 unsigned int max_end = 0;
 516
 517                 for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
 518                         for (j = 0; j < CONFIG_CHIP_SELECTS_PER_CTRL; j++) {
 519                                 fsl_ddr_cfg_regs_t *reg = &ddr_reg[i];
 520                                 if (reg->cs[j].config & 0x80000000) {
 521                                         unsigned int end;
 522                                         /*
 523                                          * 0xfffffff is a special value we put
 524                                          * for unused bnds
 525                                          */
 526                                         if (reg->cs[j].bnds == 0xffffffff)
 527                                                 continue;
 528                                         end = reg->cs[j].bnds & 0xffff;
 529                                         if (end > max_end) {
 530                                                 max_end = end;
 531                                         }
 532                                 }
 533                         }
 534                 }
 535
 536                 total_mem = 1 + (((unsigned long long)max_end << 24ULL)
 537                                     | 0xFFFFFFULL);
 538         }
 539
 540         return total_mem;
 541 }
 542
 543 /*
 544  * fsl_ddr_sdram() -- this is the main function to be called by
 545  *      initdram() in the board file.
 546  *
 547  * It returns amount of memory configured in bytes.
 548  */
 549 phys_size_t fsl_ddr_sdram(void)
 550 {
 551         unsigned int i;
 552         unsigned int law_memctl = LAW_TRGT_IF_DDR_1;
 553         unsigned long long total_memory;
 554         fsl_ddr_info_t info;
 555         int deassert_reset;
 556
 557         /* Reset info structure. */
 558         memset(&info, 0, sizeof(fsl_ddr_info_t));
 559
 560         /* Compute it once normally. */
 561 #ifdef CONFIG_FSL_DDR_INTERACTIVE
 562         if (tstc() && (getc() == 'd')) {        /* we got a key press of 'd' */
 563                 total_memory = fsl_ddr_interactive(&info, 0);
 564         } else if (fsl_ddr_interactive_env_var_exists()) {
 565                 total_memory = fsl_ddr_interactive(&info, 1);
 566         } else
 567 #endif
 568                 total_memory = fsl_ddr_compute(&info, STEP_GET_SPD, 0);
 569
 570         /* setup 3-way interleaving before enabling DDRC */
 571         if (info.memctl_opts[0].memctl_interleaving) {
 572                 switch (info.memctl_opts[0].memctl_interleaving_mode) {
 573                 case FSL_DDR_3WAY_1KB_INTERLEAVING:
 574                 case FSL_DDR_3WAY_4KB_INTERLEAVING:
 575                 case FSL_DDR_3WAY_8KB_INTERLEAVING:
 576                         fsl_ddr_set_intl3r(
 577                                 info.memctl_opts[0].memctl_interleaving_mode);
 578                         break;
 579                 default:
 580                         break;
 581                 }
 582         }
 583
 584         /*
 585          * Program configuration registers.
 586          * JEDEC specs requires clocks to be stable before deasserting reset
 587          * for RDIMMs. Clocks start after chip select is enabled and clock
 588          * control register is set. During step 1, all controllers have their
 589          * registers set but not enabled. Step 2 proceeds after deasserting
 590          * reset through board FPGA or GPIO.
 591          * For non-registered DIMMs, initialization can go through but it is
 592          * also OK to follow the same flow.
 593          */
 594         deassert_reset = board_need_mem_reset();
 595         for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
 596                 if (info.common_timing_params[i].all_dimms_registered)
 597                         deassert_reset = 1;
 598         }
 599         for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
 600                 debug("Programming controller %u\n", i);
 601                 if (info.common_timing_params[i].ndimms_present == 0) {
 602                         debug("No dimms present on controller %u; "
 603                                         "skipping programming\n", i);
 604                         continue;
 605                 }
 606                 /*
 607                  * The following call with step = 1 returns before enabling
 608                  * the controller. It has to finish with step = 2 later.
 609                  */
 610                 fsl_ddr_set_memctl_regs(&(info.fsl_ddr_config_reg[i]), i,
 611                                         deassert_reset ? 1 : 0);
 612         }
 613         if (deassert_reset) {
 614                 /* Use board FPGA or GPIO to deassert reset signal */
 615                 debug("Deasserting mem reset\n");
 616                 board_deassert_mem_reset();
 617                 for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
 618                         /* Call with step = 2 to continue initialization */
 619                         fsl_ddr_set_memctl_regs(&(info.fsl_ddr_config_reg[i]),
 620                                                 i, 2);
 621                 }
 622         }
 623
 624         /* program LAWs */
 625         for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
 626                 if (info.memctl_opts[i].memctl_interleaving) {
 627                         switch (info.memctl_opts[i].memctl_interleaving_mode) {
 628                         case FSL_DDR_CACHE_LINE_INTERLEAVING:
 629                         case FSL_DDR_PAGE_INTERLEAVING:
 630                         case FSL_DDR_BANK_INTERLEAVING:
 631                         case FSL_DDR_SUPERBANK_INTERLEAVING:
 632                                 if (i == 0) {
 633                                         law_memctl = LAW_TRGT_IF_DDR_INTRLV;
 634                                         fsl_ddr_set_lawbar(&info.common_timing_params[i],
 635                                                 law_memctl, i);
 636                                 } else if (i == 2) {
 637                                         law_memctl = LAW_TRGT_IF_DDR_INTLV_34;
 638                                         fsl_ddr_set_lawbar(&info.common_timing_params[i],
 639                                                 law_memctl, i);
 640                                 }
 641                                 break;
 642                         case FSL_DDR_3WAY_1KB_INTERLEAVING:
 643                         case FSL_DDR_3WAY_4KB_INTERLEAVING:
 644                         case FSL_DDR_3WAY_8KB_INTERLEAVING:
 645                                 law_memctl = LAW_TRGT_IF_DDR_INTLV_123;
 646                                 if (i == 0) {
 647                                         fsl_ddr_set_lawbar(&info.common_timing_params[i],
 648                                                 law_memctl, i);
 649                                 }
 650                                 break;
 651                         case FSL_DDR_4WAY_1KB_INTERLEAVING:
 652                         case FSL_DDR_4WAY_4KB_INTERLEAVING:
 653                         case FSL_DDR_4WAY_8KB_INTERLEAVING:
 654                                 law_memctl = LAW_TRGT_IF_DDR_INTLV_1234;
 655                                 if (i == 0)
 656                                         fsl_ddr_set_lawbar(&info.common_timing_params[i],
 657                                                 law_memctl, i);
 658                                 /* place holder for future 4-way interleaving */
 659                                 break;
 660                         default:
 661                                 break;
 662                         }
 663                 } else {
 664                         switch (i) {
 665                         case 0:
 666                                 law_memctl = LAW_TRGT_IF_DDR_1;
 667                                 break;
 668                         case 1:
 669                                 law_memctl = LAW_TRGT_IF_DDR_2;
 670                                 break;
 671                         case 2:
 672                                 law_memctl = LAW_TRGT_IF_DDR_3;
 673                                 break;
 674                         case 3:
 675                                 law_memctl = LAW_TRGT_IF_DDR_4;
 676                                 break;
 677                         default:
 678                                 break;
 679                         }
 680                         fsl_ddr_set_lawbar(&info.common_timing_params[i],
 681                                         law_memctl, i);
 682                 }
 683         }
 684
 685         debug("total_memory by %s = %llu\n", __func__, total_memory);
 686
 687 #if !defined(CONFIG_PHYS_64BIT)
 688         /* Check for 4G or more.  Bad. */
 689         if (total_memory >= (1ull << 32)) {
 690                 puts("Detected ");
 691                 print_size(total_memory, " of memory\n");
 692                 printf("       This U-Boot only supports < 4G of DDR\n");
 693                 printf("       You could rebuild it with CONFIG_PHYS_64BIT\n");
 694                 printf("       "); /* re-align to match init_func_ram print */
 695                 total_memory = CONFIG_MAX_MEM_MAPPED;
 696         }
 697 #endif
 698
 699         return total_memory;
 700 }
 701
 702 /*
 703  * fsl_ddr_sdram_size() - This function only returns the size of the total
 704  * memory without setting ddr control registers.
 705  */
 706 phys_size_t
 707 fsl_ddr_sdram_size(void)
 708 {
 709         fsl_ddr_info_t  info;
 710         unsigned long long total_memory = 0;
 711
 712         memset(&info, 0 , sizeof(fsl_ddr_info_t));
 713
 714         /* Compute it once normally. */
 715         total_memory = fsl_ddr_compute(&info, STEP_GET_SPD, 1);
 716
 717         return total_memory;
 718 }