drivers/ddr/fsl/ddr4_dimm_params.c

   1 /*
   2  * Copyright 2014-2016 Freescale Semiconductor, Inc.
   3  * Copyright 2017-2018 NXP Semiconductor
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  *
   7  * calculate the organization and timing parameter
   8  * from ddr3 spd, please refer to the spec
   9  * JEDEC standard No.21-C 4_01_02_12R23A.pdf
  10  *
  11  *
  12  */
  13
  14 #include <common.h>
  15 #include <fsl_ddr_sdram.h>
  16
  17 #include <fsl_ddr.h>
  18
  19 /*
  20  * Calculate the Density of each Physical Rank.
  21  * Returned size is in bytes.
  22  *
  23  * Total DIMM size =
  24  * sdram capacity(bit) / 8 * primary bus width / sdram width
  25  *                     * Logical Ranks per DIMM
  26  *
  27  * where: sdram capacity  = spd byte4[3:0]
  28  *        primary bus width = spd byte13[2:0]
  29  *        sdram width = spd byte12[2:0]
  30  *        Logical Ranks per DIMM = spd byte12[5:3] for SDP, DDP, QDP
  31  *                                 spd byte12{5:3] * spd byte6[6:4] for 3DS
  32  *
  33  * To simplify each rank size = total DIMM size / Number of Package Ranks
  34  * where Number of Package Ranks = spd byte12[5:3]
  35  *
  36  * SPD byte4 - sdram density and banks
  37  *      bit[3:0]        size(bit)       size(byte)
  38  *      0000            256Mb           32MB
  39  *      0001            512Mb           64MB
  40  *      0010            1Gb             128MB
  41  *      0011            2Gb             256MB
  42  *      0100            4Gb             512MB
  43  *      0101            8Gb             1GB
  44  *      0110            16Gb            2GB
  45  *      0111            32Gb            4GB
  46  *
  47  * SPD byte13 - module memory bus width
  48  *      bit[2:0]        primary bus width
  49  *      000             8bits
  50  *      001             16bits
  51  *      010             32bits
  52  *      011             64bits
  53  *
  54  * SPD byte12 - module organization
  55  *      bit[2:0]        sdram device width
  56  *      000             4bits
  57  *      001             8bits
  58  *      010             16bits
  59  *      011             32bits
  60  *
  61  * SPD byte12 - module organization
  62  *      bit[5:3]        number of package ranks per DIMM
  63  *      000             1
  64  *      001             2
  65  *      010             3
  66  *      011             4
  67  *
  68  * SPD byte6 - SDRAM package type
  69  *      bit[6:4]        Die count
  70  *      000             1
  71  *      001             2
  72  *      010             3
  73  *      011             4
  74  *      100             5
  75  *      101             6
  76  *      110             7
  77  *      111             8
  78  *
  79  * SPD byte6 - SRAM package type
  80  *      bit[1:0]        Signal loading
  81  *      00              Not specified
  82  *      01              Multi load stack
  83  *      10              Sigle load stack (3DS)
  84  *      11              Reserved
  85  */
  86 static unsigned long long
  87 compute_ranksize(const struct ddr4_spd_eeprom_s *spd)
  88 {
  89         unsigned long long bsize;
  90
  91         int nbit_sdram_cap_bsize = 0;
  92         int nbit_primary_bus_width = 0;
  93         int nbit_sdram_width = 0;
  94         int die_count = 0;
  95         bool package_3ds;
  96
  97         if ((spd->density_banks & 0xf) <= 7)
  98                 nbit_sdram_cap_bsize = (spd->density_banks & 0xf) + 28;
  99         if ((spd->bus_width & 0x7) < 4)
 100                 nbit_primary_bus_width = (spd->bus_width & 0x7) + 3;
 101         if ((spd->organization & 0x7) < 4)
 102                 nbit_sdram_width = (spd->organization & 0x7) + 2;
 103         package_3ds = (spd->package_type & 0x3) == 0x2;
 104         if ((spd->package_type & 0x80) && !package_3ds) { /* other than 3DS */
 105                 printf("Warning: not supported SDRAM package type\n");
 106                 return 0;
 107         }
 108         if (package_3ds)
 109                 die_count = (spd->package_type >> 4) & 0x7;
 110
 111         bsize = 1ULL << (nbit_sdram_cap_bsize - 3 +
 112                          nbit_primary_bus_width - nbit_sdram_width +
 113                          die_count);
 114
 115         debug("DDR: DDR rank density = 0x%16llx\n", bsize);
 116
 117         return bsize;
 118 }
 119
 120 #define spd_to_ps(mtb, ftb)     \
 121         (mtb * pdimm->mtb_ps + (ftb * pdimm->ftb_10th_ps) / 10)
 122 /*
 123  * ddr_compute_dimm_parameters for DDR4 SPD
 124  *
 125  * Compute DIMM parameters based upon the SPD information in spd.
 126  * Writes the results to the dimm_params_t structure pointed by pdimm.
 127  *
 128  */
 129 unsigned int ddr_compute_dimm_parameters(const unsigned int ctrl_num,
 130                                          const generic_spd_eeprom_t *spd,
 131                                          dimm_params_t *pdimm,
 132                                          unsigned int dimm_number)
 133 {
 134         unsigned int retval;
 135         int i;
 136         const u8 udimm_rc_e_dq[18] = {
 137                 0x0c, 0x2c, 0x15, 0x35, 0x15, 0x35, 0x0b, 0x2c, 0x15,
 138                 0x35, 0x0b, 0x35, 0x0b, 0x2c, 0x0b, 0x35, 0x15, 0x36
 139         };
 140         int spd_error = 0;
 141         u8 *ptr;
 142
 143         if (spd->mem_type) {
 144                 if (spd->mem_type != SPD_MEMTYPE_DDR4) {
 145                         printf("Ctrl %u DIMM %u: is not a DDR4 SPD.\n",
 146                                ctrl_num, dimm_number);
 147                         return 1;
 148                 }
 149         } else {
 150                 memset(pdimm, 0, sizeof(dimm_params_t));
 151                 return 1;
 152         }
 153
 154         retval = ddr4_spd_check(spd);
 155         if (retval) {
 156                 printf("DIMM %u: failed checksum\n", dimm_number);
 157                 return 2;
 158         }
 159
 160         /*
 161          * The part name in ASCII in the SPD EEPROM is not null terminated.
 162          * Guarantee null termination here by presetting all bytes to 0
 163          * and copying the part name in ASCII from the SPD onto it
 164          */
 165         memset(pdimm->mpart, 0, sizeof(pdimm->mpart));
 166         if ((spd->info_size_crc & 0xF) > 2)
 167                 memcpy(pdimm->mpart, spd->mpart, sizeof(pdimm->mpart) - 1);
 168
 169         /* DIMM organization parameters */
 170         pdimm->n_ranks = ((spd->organization >> 3) & 0x7) + 1;
 171         pdimm->rank_density = compute_ranksize(spd);
 172         pdimm->capacity = pdimm->n_ranks * pdimm->rank_density;
 173         pdimm->die_density = spd->density_banks & 0xf;
 174         pdimm->primary_sdram_width = 1 << (3 + (spd->bus_width & 0x7));
 175         if ((spd->bus_width >> 3) & 0x3)
 176                 pdimm->ec_sdram_width = 8;
 177         else
 178                 pdimm->ec_sdram_width = 0;
 179         pdimm->data_width = pdimm->primary_sdram_width
 180                           + pdimm->ec_sdram_width;
 181         pdimm->device_width = 1 << ((spd->organization & 0x7) + 2);
 182         pdimm->package_3ds = (spd->package_type & 0x3) == 0x2 ?
 183                              (spd->package_type >> 4) & 0x7 : 0;
 184
 185         /* These are the types defined by the JEDEC SPD spec */
 186         pdimm->mirrored_dimm = 0;
 187         pdimm->registered_dimm = 0;
 188         switch (spd->module_type & DDR4_SPD_MODULETYPE_MASK) {
 189         case DDR4_SPD_MODULETYPE_RDIMM:
 190                 /* Registered/buffered DIMMs */
 191                 pdimm->registered_dimm = 1;
 192                 if (spd->mod_section.registered.reg_map & 0x1)
 193                         pdimm->mirrored_dimm = 1;
 194                 break;
 195
 196         case DDR4_SPD_MODULETYPE_UDIMM:
 197         case DDR4_SPD_MODULETYPE_SO_DIMM:
 198                 /* Unbuffered DIMMs */
 199                 if (spd->mod_section.unbuffered.addr_mapping & 0x1)
 200                         pdimm->mirrored_dimm = 1;
 201                 if ((spd->mod_section.unbuffered.mod_height & 0xe0) == 0 &&
 202                     (spd->mod_section.unbuffered.ref_raw_card == 0x04)) {
 203                         /* Fix SPD error found on DIMMs with raw card E0 */
 204                         for (i = 0; i < 18; i++) {
 205                                 if (spd->mapping[i] == udimm_rc_e_dq[i])
 206                                         continue;
 207                                 spd_error = 1;
 208                                 debug("SPD byte %d: 0x%x, should be 0x%x\n",
 209                                       60 + i, spd->mapping[i],
 210                                       udimm_rc_e_dq[i]);
 211                                 ptr = (u8 *)&spd->mapping[i];
 212                                 *ptr = udimm_rc_e_dq[i];
 213                         }
 214                         if (spd_error)
 215                                 puts("SPD DQ mapping error fixed\n");
 216                 }
 217                 break;
 218
 219         default:
 220                 printf("unknown module_type 0x%02X\n", spd->module_type);
 221                 return 1;
 222         }
 223
 224         /* SDRAM device parameters */
 225         pdimm->n_row_addr = ((spd->addressing >> 3) & 0x7) + 12;
 226         pdimm->n_col_addr = (spd->addressing & 0x7) + 9;
 227         pdimm->bank_addr_bits = (spd->density_banks >> 4) & 0x3;
 228         pdimm->bank_group_bits = (spd->density_banks >> 6) & 0x3;
 229
 230         /*
 231          * The SPD spec has not the ECC bit,
 232          * We consider the DIMM as ECC capability
 233          * when the extension bus exist
 234          */
 235         if (pdimm->ec_sdram_width)
 236                 pdimm->edc_config = 0x02;
 237         else
 238                 pdimm->edc_config = 0x00;
 239
 240         /*
 241          * The SPD spec has not the burst length byte
 242          * but DDR4 spec has nature BL8 and BC4,
 243          * BL8 -bit3, BC4 -bit2
 244          */
 245         pdimm->burst_lengths_bitmask = 0x0c;
 246         pdimm->row_density = __ilog2(pdimm->rank_density);
 247
 248         /* MTB - medium timebase
 249          * The MTB in the SPD spec is 125ps,
 250          *
 251          * FTB - fine timebase
 252          * use 1/10th of ps as our unit to avoid floating point
 253          * eg, 10 for 1ps, 25 for 2.5ps, 50 for 5ps
 254          */
 255         if ((spd->timebases & 0xf) == 0x0) {
 256                 pdimm->mtb_ps = 125;
 257                 pdimm->ftb_10th_ps = 10;
 258
 259         } else {
 260                 printf("Unknown Timebases\n");
 261         }
 262
 263         /* sdram minimum cycle time */
 264         pdimm->tckmin_x_ps = spd_to_ps(spd->tck_min, spd->fine_tck_min);
 265
 266         /* sdram max cycle time */
 267         pdimm->tckmax_ps = spd_to_ps(spd->tck_max, spd->fine_tck_max);
 268
 269         /*
 270          * CAS latency supported
 271          * bit0 - CL7
 272          * bit4 - CL11
 273          * bit8 - CL15
 274          * bit12- CL19
 275          * bit16- CL23
 276          */
 277         pdimm->caslat_x  = (spd->caslat_b1 << 7)        |
 278                            (spd->caslat_b2 << 15)       |
 279                            (spd->caslat_b3 << 23);
 280
 281         BUG_ON(spd->caslat_b4 != 0);
 282
 283         /*
 284          * min CAS latency time
 285          */
 286         pdimm->taa_ps = spd_to_ps(spd->taa_min, spd->fine_taa_min);
 287
 288         /*
 289          * min RAS to CAS delay time
 290          */
 291         pdimm->trcd_ps = spd_to_ps(spd->trcd_min, spd->fine_trcd_min);
 292
 293         /*
 294          * Min Row Precharge Delay Time
 295          */
 296         pdimm->trp_ps = spd_to_ps(spd->trp_min, spd->fine_trp_min);
 297
 298         /* min active to precharge delay time */
 299         pdimm->tras_ps = (((spd->tras_trc_ext & 0xf) << 8) +
 300                           spd->tras_min_lsb) * pdimm->mtb_ps;
 301
 302         /* min active to actice/refresh delay time */
 303         pdimm->trc_ps = spd_to_ps((((spd->tras_trc_ext & 0xf0) << 4) +
 304                                    spd->trc_min_lsb), spd->fine_trc_min);
 305         /* Min Refresh Recovery Delay Time */
 306         pdimm->trfc1_ps = ((spd->trfc1_min_msb << 8) | (spd->trfc1_min_lsb)) *
 307                        pdimm->mtb_ps;
 308         pdimm->trfc2_ps = ((spd->trfc2_min_msb << 8) | (spd->trfc2_min_lsb)) *
 309                        pdimm->mtb_ps;
 310         pdimm->trfc4_ps = ((spd->trfc4_min_msb << 8) | (spd->trfc4_min_lsb)) *
 311                         pdimm->mtb_ps;
 312         /* min four active window delay time */
 313         pdimm->tfaw_ps = (((spd->tfaw_msb & 0xf) << 8) | spd->tfaw_min) *
 314                         pdimm->mtb_ps;
 315
 316         /* min row active to row active delay time, different bank group */
 317         pdimm->trrds_ps = spd_to_ps(spd->trrds_min, spd->fine_trrds_min);
 318         /* min row active to row active delay time, same bank group */
 319         pdimm->trrdl_ps = spd_to_ps(spd->trrdl_min, spd->fine_trrdl_min);
 320         /* min CAS to CAS Delay Time (tCCD_Lmin), same bank group */
 321         pdimm->tccdl_ps = spd_to_ps(spd->tccdl_min, spd->fine_tccdl_min);
 322
 323         if (pdimm->package_3ds) {
 324                 if (pdimm->die_density <= 0x4) {
 325                         pdimm->trfc_slr_ps = 260000;
 326                 } else if (pdimm->die_density <= 0x5) {
 327                         pdimm->trfc_slr_ps = 350000;
 328                 } else {
 329                         printf("WARN: Unsupported logical rank density 0x%x\n",
 330                                pdimm->die_density);
 331                 }
 332         }
 333
 334         /*
 335          * Average periodic refresh interval
 336          * tREFI = 7.8 us at normal temperature range
 337          */
 338         pdimm->refresh_rate_ps = 7800000;
 339
 340         for (i = 0; i < 18; i++)
 341                 pdimm->dq_mapping[i] = spd->mapping[i];
 342
 343         pdimm->dq_mapping_ors = ((spd->mapping[0] >> 6) & 0x3) == 0 ? 1 : 0;
 344
 345         return 0;
 346 }