board/freescale/ls1046ardb/ddr.c

   1 /*
   2  * Copyright 2016 Freescale Semiconductor, Inc.
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <common.h>
   8 #include <fsl_ddr_sdram.h>
   9 #include <fsl_ddr_dimm_params.h>
  10 #include "ddr.h"
  11 #ifdef CONFIG_FSL_DEEP_SLEEP
  12 #include <fsl_sleep.h>
  13 #endif
  14
  15 DECLARE_GLOBAL_DATA_PTR;
  16
  17 void fsl_ddr_board_options(memctl_options_t *popts,
  18                            dimm_params_t *pdimm,
  19                            unsigned int ctrl_num)
  20 {
  21         const struct board_specific_parameters *pbsp, *pbsp_highest = NULL;
  22         ulong ddr_freq;
  23
  24         if (ctrl_num > 1) {
  25                 printf("Not supported controller number %d\n", ctrl_num);
  26                 return;
  27         }
  28         if (!pdimm->n_ranks)
  29                 return;
  30
  31         pbsp = udimms[0];
  32
  33         /* Get clk_adjust, wrlvl_start, wrlvl_ctl, according to the board ddr
  34          * freqency and n_banks specified in board_specific_parameters table.
  35          */
  36         ddr_freq = get_ddr_freq(0) / 1000000;
  37         while (pbsp->datarate_mhz_high) {
  38                 if (pbsp->n_ranks == pdimm->n_ranks) {
  39                         if (ddr_freq <= pbsp->datarate_mhz_high) {
  40                                 popts->clk_adjust = pbsp->clk_adjust;
  41                                 popts->wrlvl_start = pbsp->wrlvl_start;
  42                                 popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2;
  43                                 popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3;
  44                                 goto found;
  45                         }
  46                         pbsp_highest = pbsp;
  47                 }
  48                 pbsp++;
  49         }
  50
  51         if (pbsp_highest) {
  52                 printf("Error: board specific timing not found for %lu MT/s\n",
  53                        ddr_freq);
  54                 printf("Trying to use the highest speed (%u) parameters\n",
  55                        pbsp_highest->datarate_mhz_high);
  56                 popts->clk_adjust = pbsp_highest->clk_adjust;
  57                 popts->wrlvl_start = pbsp_highest->wrlvl_start;
  58                 popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2;
  59                 popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3;
  60         } else {
  61                 panic("DIMM is not supported by this board");
  62         }
  63 found:
  64         debug("Found timing match: n_ranks %d, data rate %d, rank_gb %d\n",
  65               pbsp->n_ranks, pbsp->datarate_mhz_high, pbsp->rank_gb);
  66
  67         popts->data_bus_width = 0;      /* 64-bit data bus */
  68         popts->otf_burst_chop_en = 0;
  69         popts->burst_length = DDR_BL8;
  70         popts->bstopre = 0;             /* enable auto precharge */
  71
  72         /*
  73          * Factors to consider for half-strength driver enable:
  74          *      - number of DIMMs installed
  75          */
  76         popts->half_strength_driver_enable = 0;
  77         /*
  78          * Write leveling override
  79          */
  80         popts->wrlvl_override = 1;
  81         popts->wrlvl_sample = 0xf;
  82
  83         /*
  84          * Rtt and Rtt_WR override
  85          */
  86         popts->rtt_override = 0;
  87
  88         /* Enable ZQ calibration */
  89         popts->zq_en = 1;
  90
  91         popts->ddr_cdr1 = DDR_CDR1_DHC_EN | DDR_CDR1_ODT(DDR_CDR_ODT_80ohm);
  92         popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_80ohm) |
  93                           DDR_CDR2_VREF_TRAIN_EN | DDR_CDR2_VREF_RANGE_2;
  94
  95         /* optimize cpo for erratum A-009942 */
  96         popts->cpo_sample = 0x70;
  97 }
  98
  99 int fsl_initdram(void)
 100 {
 101         phys_size_t dram_size;
 102
 103 #if defined(CONFIG_SPL) && !defined(CONFIG_SPL_BUILD)
 104         gd->ram_size = fsl_ddr_sdram_size();
 105
 106         return 0;
 107 #else
 108         puts("Initializing DDR....using SPD\n");
 109
 110         dram_size = fsl_ddr_sdram();
 111 #endif
 112
 113         erratum_a008850_post();
 114
 115         gd->ram_size = dram_size;
 116
 117         return 0;
 118 }