board/freescale/t104xrdb/ddr.c

   1 /*
   2  * Copyright 2013 Freescale Semiconductor, Inc.
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <common.h>
   8 #include <i2c.h>
   9 #include <hwconfig.h>
  10 #include <asm/mmu.h>
  11 #include <fsl_ddr_sdram.h>
  12 #include <fsl_ddr_dimm_params.h>
  13 #include <asm/fsl_law.h>
  14 #include "ddr.h"
  15
  16 DECLARE_GLOBAL_DATA_PTR;
  17
  18 int fsl_ddr_get_dimm_params(dimm_params_t *pdimm,
  19                 unsigned int controller_number,
  20                 unsigned int dimm_number)
  21 {
  22         const char dimm_model[] = "RAW timing DDR";
  23
  24         if ((controller_number == 0) && (dimm_number == 0)) {
  25                 memcpy(pdimm, &ddr_raw_timing, sizeof(dimm_params_t));
  26                 memset(pdimm->mpart, 0, sizeof(pdimm->mpart));
  27                 memcpy(pdimm->mpart, dimm_model, sizeof(dimm_model) - 1);
  28         }
  29
  30         return 0;
  31 }
  32
  33 void fsl_ddr_board_options(memctl_options_t *popts,
  34                                 dimm_params_t *pdimm,
  35                                 unsigned int ctrl_num)
  36 {
  37         const struct board_specific_parameters *pbsp, *pbsp_highest = NULL;
  38         ulong ddr_freq;
  39
  40         if (ctrl_num > 1) {
  41                 printf("Not supported controller number %d\n", ctrl_num);
  42                 return;
  43         }
  44         if (!pdimm->n_ranks)
  45                 return;
  46
  47         pbsp = udimms[0];
  48
  49         /* Get clk_adjust, cpo, write_data_delay,2t, according to the board ddr
  50          * freqency and n_banks specified in board_specific_parameters table.
  51          */
  52         ddr_freq = get_ddr_freq(0) / 1000000;
  53         while (pbsp->datarate_mhz_high) {
  54                 if (pbsp->n_ranks == pdimm->n_ranks &&
  55                     (pdimm->rank_density >> 30) >= pbsp->rank_gb) {
  56                         if (ddr_freq <= pbsp->datarate_mhz_high) {
  57                                 popts->cpo_override = pbsp->cpo;
  58                                 popts->write_data_delay =
  59                                         pbsp->write_data_delay;
  60                                 popts->clk_adjust = pbsp->clk_adjust;
  61                                 popts->wrlvl_start = pbsp->wrlvl_start;
  62                                 popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2;
  63                                 popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3;
  64                                 popts->twot_en = pbsp->force_2t;
  65                                 goto found;
  66                         }
  67                         pbsp_highest = pbsp;
  68                 }
  69                 pbsp++;
  70         }
  71
  72         if (pbsp_highest) {
  73                 printf("Error: board specific timing not found\n");
  74                 printf("for data rate %lu MT/s\n", ddr_freq);
  75                 printf("Trying to use the highest speed (%u) parameters\n",
  76                        pbsp_highest->datarate_mhz_high);
  77                 popts->cpo_override = pbsp_highest->cpo;
  78                 popts->write_data_delay = pbsp_highest->write_data_delay;
  79                 popts->clk_adjust = pbsp_highest->clk_adjust;
  80                 popts->wrlvl_start = pbsp_highest->wrlvl_start;
  81                 popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2;
  82                 popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3;
  83                 popts->twot_en = pbsp_highest->force_2t;
  84         } else {
  85                 panic("DIMM is not supported by this board");
  86         }
  87 found:
  88         debug("Found timing match: n_ranks %d, data rate %d, rank_gb %d\n"
  89                 "\tclk_adjust %d, wrlvl_start %d, wrlvl_ctrl_2 0x%x, "
  90                 "wrlvl_ctrl_3 0x%x\n",
  91                 pbsp->n_ranks, pbsp->datarate_mhz_high, pbsp->rank_gb,
  92                 pbsp->clk_adjust, pbsp->wrlvl_start, pbsp->wrlvl_ctl_2,
  93                 pbsp->wrlvl_ctl_3);
  94
  95         /*
  96          * Factors to consider for half-strength driver enable:
  97          *      - number of DIMMs installed
  98          */
  99         popts->half_strength_driver_enable = 0;
 100         /*
 101          * Write leveling override
 102          */
 103         popts->wrlvl_override = 1;
 104         popts->wrlvl_sample = 0xf;
 105
 106         /*
 107          * rtt and rtt_wr override
 108          */
 109         popts->rtt_override = 0;
 110
 111         /* Enable ZQ calibration */
 112         popts->zq_en = 1;
 113
 114         /* DHC_EN =1, ODT = 75 Ohm */
 115         popts->ddr_cdr1 = DDR_CDR1_DHC_EN | DDR_CDR1_ODT(DDR_CDR_ODT_75ohm);
 116         popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_75ohm);
 117 }
 118
 119 phys_size_t initdram(int board_type)
 120 {
 121         phys_size_t dram_size;
 122
 123         puts("Initializing....using SPD\n");
 124
 125         dram_size = fsl_ddr_sdram();
 126
 127         dram_size = setup_ddr_tlbs(dram_size / 0x100000);
 128         dram_size *= 0x100000;
 129
 130         puts("    DDR: ");
 131         return dram_size;
 132 }