board/freescale/ls1043aqds/ddr.c

   1 /*
   2  * Copyright 2015 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 #ifdef CONFIG_FSL_DEEP_SLEEP
  11 #include <fsl_sleep.h>
  12 #endif
  13 #include "ddr.h"
  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 > 3) {
  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                                 popts->cpo_override = pbsp->cpo_override;
  45                                 popts->write_data_delay =
  46                                         pbsp->write_data_delay;
  47                                 goto found;
  48                         }
  49                         pbsp_highest = pbsp;
  50                 }
  51                 pbsp++;
  52         }
  53
  54         if (pbsp_highest) {
  55                 printf("Error: board specific timing not found for %lu MT/s\n",
  56                        ddr_freq);
  57                 printf("Trying to use the highest speed (%u) parameters\n",
  58                        pbsp_highest->datarate_mhz_high);
  59                 popts->clk_adjust = pbsp_highest->clk_adjust;
  60                 popts->wrlvl_start = pbsp_highest->wrlvl_start;
  61                 popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2;
  62                 popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3;
  63         } else {
  64                 panic("DIMM is not supported by this board");
  65         }
  66 found:
  67         debug("Found timing match: n_ranks %d, data rate %d, rank_gb %d\n",
  68               pbsp->n_ranks, pbsp->datarate_mhz_high, pbsp->rank_gb);
  69
  70         /* force DDR bus width to 32 bits */
  71         popts->data_bus_width = 1;
  72         popts->otf_burst_chop_en = 0;
  73         popts->burst_length = DDR_BL8;
  74         popts->bstopre = 0;             /* enable auto precharge */
  75
  76         /*
  77          * Factors to consider for half-strength driver enable:
  78          *      - number of DIMMs installed
  79          */
  80         popts->half_strength_driver_enable = 1;
  81         /*
  82          * Write leveling override
  83          */
  84         popts->wrlvl_override = 1;
  85         popts->wrlvl_sample = 0xf;
  86
  87         /*
  88          * Rtt and Rtt_WR override
  89          */
  90         popts->rtt_override = 0;
  91
  92         /* Enable ZQ calibration */
  93         popts->zq_en = 1;
  94
  95 #ifdef CONFIG_SYS_FSL_DDR4
  96         popts->ddr_cdr1 = DDR_CDR1_DHC_EN | DDR_CDR1_ODT(DDR_CDR_ODT_80ohm);
  97         popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_80ohm) |
  98                           DDR_CDR2_VREF_OVRD(70);       /* Vref = 70% */
  99
 100         /* optimize cpo for erratum A-009942 */
 101         popts->cpo_sample = 0x59;
 102 #else
 103         popts->cswl_override = DDR_CSWL_CS0;
 104
 105         /* DHC_EN =1, ODT = 75 Ohm */
 106         popts->ddr_cdr1 = DDR_CDR1_DHC_EN | DDR_CDR1_ODT(DDR_CDR_ODT_75ohm);
 107         popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_75ohm);
 108 #endif
 109 }
 110
 111 int initdram(void)
 112 {
 113         phys_size_t dram_size;
 114
 115 #if defined(CONFIG_SPL) && !defined(CONFIG_SPL_BUILD)
 116         return fsl_ddr_sdram_size();
 117 #else
 118         puts("Initializing DDR....using SPD\n");
 119
 120         dram_size = fsl_ddr_sdram();
 121 #endif
 122         erratum_a008850_post();
 123
 124 #ifdef CONFIG_FSL_DEEP_SLEEP
 125         fsl_dp_ddr_restore();
 126 #endif
 127
 128         gd->ram_size = dram_size;
 129
 130         return 0;
 131 }