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 /* processor specific function */
  29 extern void fsl_ddr_set_memctl_regs(const fsl_ddr_cfg_regs_t *regs,
  30                                    unsigned int ctrl_num);
  31
  32 #if defined(SPD_EEPROM_ADDRESS) || \
  33     defined(SPD_EEPROM_ADDRESS1) || defined(SPD_EEPROM_ADDRESS2) || \
  34     defined(SPD_EEPROM_ADDRESS3) || defined(SPD_EEPROM_ADDRESS4)
  35 #if (CONFIG_NUM_DDR_CONTROLLERS == 1) && (CONFIG_DIMM_SLOTS_PER_CTLR == 1)
  36 u8 spd_i2c_addr[CONFIG_NUM_DDR_CONTROLLERS][CONFIG_DIMM_SLOTS_PER_CTLR] = {
  37         [0][0] = SPD_EEPROM_ADDRESS,
  38 };
  39 #elif (CONFIG_NUM_DDR_CONTROLLERS == 1) && (CONFIG_DIMM_SLOTS_PER_CTLR == 2)
  40 u8 spd_i2c_addr[CONFIG_NUM_DDR_CONTROLLERS][CONFIG_DIMM_SLOTS_PER_CTLR] = {
  41         [0][0] = SPD_EEPROM_ADDRESS1,   /* controller 1 */
  42         [0][1] = SPD_EEPROM_ADDRESS2,   /* controller 1 */
  43 };
  44 #elif (CONFIG_NUM_DDR_CONTROLLERS == 2) && (CONFIG_DIMM_SLOTS_PER_CTLR == 1)
  45 u8 spd_i2c_addr[CONFIG_NUM_DDR_CONTROLLERS][CONFIG_DIMM_SLOTS_PER_CTLR] = {
  46         [0][0] = SPD_EEPROM_ADDRESS1,   /* controller 1 */
  47         [1][0] = SPD_EEPROM_ADDRESS2,   /* controller 2 */
  48 };
  49 #elif (CONFIG_NUM_DDR_CONTROLLERS == 2) && (CONFIG_DIMM_SLOTS_PER_CTLR == 2)
  50 u8 spd_i2c_addr[CONFIG_NUM_DDR_CONTROLLERS][CONFIG_DIMM_SLOTS_PER_CTLR] = {
  51         [0][0] = SPD_EEPROM_ADDRESS1,   /* controller 1 */
  52         [0][1] = SPD_EEPROM_ADDRESS2,   /* controller 1 */
  53         [1][0] = SPD_EEPROM_ADDRESS3,   /* controller 2 */
  54         [1][1] = SPD_EEPROM_ADDRESS4,   /* controller 2 */
  55 };
  56 #elif (CONFIG_NUM_DDR_CONTROLLERS == 3) && (CONFIG_DIMM_SLOTS_PER_CTLR == 1)
  57 u8 spd_i2c_addr[CONFIG_NUM_DDR_CONTROLLERS][CONFIG_DIMM_SLOTS_PER_CTLR] = {
  58         [0][0] = SPD_EEPROM_ADDRESS1,   /* controller 1 */
  59         [1][0] = SPD_EEPROM_ADDRESS2,   /* controller 2 */
  60         [2][0] = SPD_EEPROM_ADDRESS3,   /* controller 3 */
  61 };
  62 #elif (CONFIG_NUM_DDR_CONTROLLERS == 3) && (CONFIG_DIMM_SLOTS_PER_CTLR == 2)
  63 u8 spd_i2c_addr[CONFIG_NUM_DDR_CONTROLLERS][CONFIG_DIMM_SLOTS_PER_CTLR] = {
  64         [0][0] = SPD_EEPROM_ADDRESS1,   /* controller 1 */
  65         [0][1] = SPD_EEPROM_ADDRESS2,   /* controller 1 */
  66         [1][0] = SPD_EEPROM_ADDRESS3,   /* controller 2 */
  67         [1][1] = SPD_EEPROM_ADDRESS4,   /* controller 2 */
  68         [2][0] = SPD_EEPROM_ADDRESS5,   /* controller 3 */
  69         [2][1] = SPD_EEPROM_ADDRESS6,   /* controller 3 */
  70 };
  71
  72 #endif
  73
  74 static void __get_spd(generic_spd_eeprom_t *spd, u8 i2c_address)
  75 {
  76         int 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
 369         fsl_ddr_cfg_regs_t *ddr_reg = pinfo->fsl_ddr_config_reg;
 370         common_timing_params_t *timing_params = pinfo->common_timing_params;
 371
 372         /* data bus width capacity adjust shift amount */
 373         unsigned int dbw_capacity_adjust[CONFIG_NUM_DDR_CONTROLLERS];
 374
 375         for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
 376                 dbw_capacity_adjust[i] = 0;
 377         }
 378
 379         debug("starting at step %u (%s)\n",
 380               start_step, step_to_string(start_step));
 381
 382         switch (start_step) {
 383         case STEP_GET_SPD:
 384 #if defined(CONFIG_DDR_SPD) || defined(CONFIG_SPD_EEPROM)
 385                 /* STEP 1:  Gather all DIMM SPD data */
 386                 for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
 387                         fsl_ddr_get_spd(pinfo->spd_installed_dimms[i], i);
 388                 }
 389
 390         case STEP_COMPUTE_DIMM_PARMS:
 391                 /* STEP 2:  Compute DIMM parameters from SPD data */
 392
 393                 for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
 394                         for (j = 0; j < CONFIG_DIMM_SLOTS_PER_CTLR; j++) {
 395                                 unsigned int retval;
 396                                 generic_spd_eeprom_t *spd =
 397                                         &(pinfo->spd_installed_dimms[i][j]);
 398                                 dimm_params_t *pdimm =
 399                                         &(pinfo->dimm_params[i][j]);
 400
 401                                 retval = compute_dimm_parameters(spd, pdimm, i);
 402 #ifdef CONFIG_SYS_DDR_RAW_TIMING
 403                                 if (!i && !j && retval) {
 404                                         printf("SPD error on controller %d! "
 405                                         "Trying fallback to raw timing "
 406                                         "calculation\n", i);
 407                                         fsl_ddr_get_dimm_params(pdimm, i, j);
 408                                 }
 409 #else
 410                                 if (retval == 2) {
 411                                         printf("Error: compute_dimm_parameters"
 412                                         " non-zero returned FATAL value "
 413                                         "for memctl=%u dimm=%u\n", i, j);
 414                                         return 0;
 415                                 }
 416 #endif
 417                                 if (retval) {
 418                                         debug("Warning: compute_dimm_parameters"
 419                                         " non-zero return value for memctl=%u "
 420                                         "dimm=%u\n", i, j);
 421                                 }
 422                         }
 423                 }
 424
 425 #elif defined(CONFIG_SYS_DDR_RAW_TIMING)
 426         case STEP_COMPUTE_DIMM_PARMS:
 427                 for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
 428                         for (j = 0; j < CONFIG_DIMM_SLOTS_PER_CTLR; j++) {
 429                                 dimm_params_t *pdimm =
 430                                         &(pinfo->dimm_params[i][j]);
 431                                 fsl_ddr_get_dimm_params(pdimm, i, j);
 432                         }
 433                 }
 434                 debug("Filling dimm parameters from board specific file\n");
 435 #endif
 436         case STEP_COMPUTE_COMMON_PARMS:
 437                 /*
 438                  * STEP 3: Compute a common set of timing parameters
 439                  * suitable for all of the DIMMs on each memory controller
 440                  */
 441                 for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
 442                         debug("Computing lowest common DIMM"
 443                                 " parameters for memctl=%u\n", i);
 444                         compute_lowest_common_dimm_parameters(
 445                                 pinfo->dimm_params[i],
 446                                 &timing_params[i],
 447                                 CONFIG_DIMM_SLOTS_PER_CTLR);
 448                 }
 449
 450         case STEP_GATHER_OPTS:
 451                 /* STEP 4:  Gather configuration requirements from user */
 452                 for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
 453                         debug("Reloading memory controller "
 454                                 "configuration options for memctl=%u\n", i);
 455                         /*
 456                          * This "reloads" the memory controller options
 457                          * to defaults.  If the user "edits" an option,
 458                          * next_step points to the step after this,
 459                          * which is currently STEP_ASSIGN_ADDRESSES.
 460                          */
 461                         populate_memctl_options(
 462                                         timing_params[i].all_DIMMs_registered,
 463                                         &pinfo->memctl_opts[i],
 464                                         pinfo->dimm_params[i], i);
 465                 }
 466         case STEP_ASSIGN_ADDRESSES:
 467                 /* STEP 5:  Assign addresses to chip selects */
 468                 check_interleaving_options(pinfo);
 469                 total_mem = step_assign_addresses(pinfo, dbw_capacity_adjust);
 470
 471         case STEP_COMPUTE_REGS:
 472                 /* STEP 6:  compute controller register values */
 473                 debug("FSL Memory ctrl register computation\n");
 474                 for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
 475                         if (timing_params[i].ndimms_present == 0) {
 476                                 memset(&ddr_reg[i], 0,
 477                                         sizeof(fsl_ddr_cfg_regs_t));
 478                                 continue;
 479                         }
 480
 481                         compute_fsl_memctl_config_regs(
 482                                         &pinfo->memctl_opts[i],
 483                                         &ddr_reg[i], &timing_params[i],
 484                                         pinfo->dimm_params[i],
 485                                         dbw_capacity_adjust[i],
 486                                         size_only);
 487                 }
 488
 489         default:
 490                 break;
 491         }
 492
 493         {
 494                 /*
 495                  * Compute the amount of memory available just by
 496                  * looking for the highest valid CSn_BNDS value.
 497                  * This allows us to also experiment with using
 498                  * only CS0 when using dual-rank DIMMs.
 499                  */
 500                 unsigned int max_end = 0;
 501
 502                 for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
 503                         for (j = 0; j < CONFIG_CHIP_SELECTS_PER_CTRL; j++) {
 504                                 fsl_ddr_cfg_regs_t *reg = &ddr_reg[i];
 505                                 if (reg->cs[j].config & 0x80000000) {
 506                                         unsigned int end;
 507                                         end = reg->cs[j].bnds & 0xFFF;
 508                                         if (end > max_end) {
 509                                                 max_end = end;
 510                                         }
 511                                 }
 512                         }
 513                 }
 514
 515                 total_mem = 1 + (((unsigned long long)max_end << 24ULL)
 516                                     | 0xFFFFFFULL);
 517         }
 518
 519         return total_mem;
 520 }
 521
 522 /*
 523  * fsl_ddr_sdram() -- this is the main function to be called by
 524  *      initdram() in the board file.
 525  *
 526  * It returns amount of memory configured in bytes.
 527  */
 528 phys_size_t fsl_ddr_sdram(void)
 529 {
 530         unsigned int i;
 531         unsigned int law_memctl = LAW_TRGT_IF_DDR_1;
 532         unsigned long long total_memory;
 533         fsl_ddr_info_t info;
 534
 535         /* Reset info structure. */
 536         memset(&info, 0, sizeof(fsl_ddr_info_t));
 537
 538         /* Compute it once normally. */
 539 #ifdef CONFIG_FSL_DDR_INTERACTIVE
 540         if (tstc() && (getc() == 'd')) {        /* we got a key press of 'd' */
 541                 total_memory = fsl_ddr_interactive(&info, 0);
 542         } else if (fsl_ddr_interactive_env_var_exists()) {
 543                 total_memory = fsl_ddr_interactive(&info, 1);
 544         } else
 545 #endif
 546                 total_memory = fsl_ddr_compute(&info, STEP_GET_SPD, 0);
 547
 548         /* setup 3-way interleaving before enabling DDRC */
 549         if (info.memctl_opts[0].memctl_interleaving) {
 550                 switch (info.memctl_opts[0].memctl_interleaving_mode) {
 551                 case FSL_DDR_3WAY_1KB_INTERLEAVING:
 552                 case FSL_DDR_3WAY_4KB_INTERLEAVING:
 553                 case FSL_DDR_3WAY_8KB_INTERLEAVING:
 554                         fsl_ddr_set_intl3r(
 555                                 info.memctl_opts[0].memctl_interleaving_mode);
 556                         break;
 557                 default:
 558                         break;
 559                 }
 560         }
 561
 562         /* Program configuration registers. */
 563         for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
 564                 debug("Programming controller %u\n", i);
 565                 if (info.common_timing_params[i].ndimms_present == 0) {
 566                         debug("No dimms present on controller %u; "
 567                                         "skipping programming\n", i);
 568                         continue;
 569                 }
 570
 571                 fsl_ddr_set_memctl_regs(&(info.fsl_ddr_config_reg[i]), i);
 572         }
 573
 574         /* program LAWs */
 575         for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
 576                 if (info.memctl_opts[i].memctl_interleaving) {
 577                         switch (info.memctl_opts[i].memctl_interleaving_mode) {
 578                         case FSL_DDR_CACHE_LINE_INTERLEAVING:
 579                         case FSL_DDR_PAGE_INTERLEAVING:
 580                         case FSL_DDR_BANK_INTERLEAVING:
 581                         case FSL_DDR_SUPERBANK_INTERLEAVING:
 582                                 if (i == 0) {
 583                                         law_memctl = LAW_TRGT_IF_DDR_INTRLV;
 584                                         fsl_ddr_set_lawbar(&info.common_timing_params[i],
 585                                                 law_memctl, i);
 586                                 } else if (i == 2) {
 587                                         law_memctl = LAW_TRGT_IF_DDR_INTLV_34;
 588                                         fsl_ddr_set_lawbar(&info.common_timing_params[i],
 589                                                 law_memctl, i);
 590                                 }
 591                                 break;
 592                         case FSL_DDR_3WAY_1KB_INTERLEAVING:
 593                         case FSL_DDR_3WAY_4KB_INTERLEAVING:
 594                         case FSL_DDR_3WAY_8KB_INTERLEAVING:
 595                                 law_memctl = LAW_TRGT_IF_DDR_INTLV_123;
 596                                 if (i == 0) {
 597                                         fsl_ddr_set_lawbar(&info.common_timing_params[i],
 598                                                 law_memctl, i);
 599                                 }
 600                                 break;
 601                         case FSL_DDR_4WAY_1KB_INTERLEAVING:
 602                         case FSL_DDR_4WAY_4KB_INTERLEAVING:
 603                         case FSL_DDR_4WAY_8KB_INTERLEAVING:
 604                                 law_memctl = LAW_TRGT_IF_DDR_INTLV_1234;
 605                                 if (i == 0)
 606                                         fsl_ddr_set_lawbar(&info.common_timing_params[i],
 607                                                 law_memctl, i);
 608                                 /* place holder for future 4-way interleaving */
 609                                 break;
 610                         default:
 611                                 break;
 612                         }
 613                 } else {
 614                         switch (i) {
 615                         case 0:
 616                                 law_memctl = LAW_TRGT_IF_DDR_1;
 617                                 break;
 618                         case 1:
 619                                 law_memctl = LAW_TRGT_IF_DDR_2;
 620                                 break;
 621                         case 2:
 622                                 law_memctl = LAW_TRGT_IF_DDR_3;
 623                                 break;
 624                         case 3:
 625                                 law_memctl = LAW_TRGT_IF_DDR_4;
 626                                 break;
 627                         default:
 628                                 break;
 629                         }
 630                         fsl_ddr_set_lawbar(&info.common_timing_params[i],
 631                                         law_memctl, i);
 632                 }
 633         }
 634
 635         debug("total_memory by %s = %llu\n", __func__, total_memory);
 636
 637 #if !defined(CONFIG_PHYS_64BIT)
 638         /* Check for 4G or more.  Bad. */
 639         if (total_memory >= (1ull << 32)) {
 640                 printf("Detected %lld MB of memory\n", total_memory >> 20);
 641                 printf("       This U-Boot only supports < 4G of DDR\n");
 642                 printf("       You could rebuild it with CONFIG_PHYS_64BIT\n");
 643                 printf("       "); /* re-align to match init_func_ram print */
 644                 total_memory = CONFIG_MAX_MEM_MAPPED;
 645         }
 646 #endif
 647
 648         return total_memory;
 649 }
 650
 651 /*
 652  * fsl_ddr_sdram_size() - This function only returns the size of the total
 653  * memory without setting ddr control registers.
 654  */
 655 phys_size_t
 656 fsl_ddr_sdram_size(void)
 657 {
 658         fsl_ddr_info_t  info;
 659         unsigned long long total_memory = 0;
 660
 661         memset(&info, 0 , sizeof(fsl_ddr_info_t));
 662
 663         /* Compute it once normally. */
 664         total_memory = fsl_ddr_compute(&info, STEP_GET_SPD, 1);
 665
 666         return total_memory;
 667 }