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 #include <asm/arch/clock.h>
  15
  16 DECLARE_GLOBAL_DATA_PTR;
  17
  18 void fsl_ddr_board_options(memctl_options_t *popts,
  19                            dimm_params_t *pdimm,
  20                            unsigned int ctrl_num)
  21 {
  22         const struct board_specific_parameters *pbsp, *pbsp_highest = NULL;
  23         ulong ddr_freq;
  24
  25         if (ctrl_num > 1) {
  26                 printf("Not supported controller number %d\n", ctrl_num);
  27                 return;
  28         }
  29         if (!pdimm->n_ranks)
  30                 return;
  31
  32         pbsp = udimms[0];
  33
  34         /* Get clk_adjust, wrlvl_start, wrlvl_ctl, according to the board ddr
  35          * freqency and n_banks specified in board_specific_parameters table.
  36          */
  37         ddr_freq = get_ddr_freq(0) / 1000000;
  38         while (pbsp->datarate_mhz_high) {
  39                 if (pbsp->n_ranks == pdimm->n_ranks) {
  40                         if (ddr_freq <= pbsp->datarate_mhz_high) {
  41                                 popts->clk_adjust = pbsp->clk_adjust;
  42                                 popts->wrlvl_start = pbsp->wrlvl_start;
  43                                 popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2;
  44                                 popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3;
  45                                 goto found;
  46                         }
  47                         pbsp_highest = pbsp;
  48                 }
  49                 pbsp++;
  50         }
  51
  52         if (pbsp_highest) {
  53                 printf("Error: board specific timing not found for %lu MT/s\n",
  54                        ddr_freq);
  55                 printf("Trying to use the highest speed (%u) parameters\n",
  56                        pbsp_highest->datarate_mhz_high);
  57                 popts->clk_adjust = pbsp_highest->clk_adjust;
  58                 popts->wrlvl_start = pbsp_highest->wrlvl_start;
  59                 popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2;
  60                 popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3;
  61         } else {
  62                 panic("DIMM is not supported by this board");
  63         }
  64 found:
  65         debug("Found timing match: n_ranks %d, data rate %d, rank_gb %d\n",
  66               pbsp->n_ranks, pbsp->datarate_mhz_high, pbsp->rank_gb);
  67
  68         popts->data_bus_width = 0;      /* 64-bit data bus */
  69         popts->otf_burst_chop_en = 0;
  70         popts->burst_length = DDR_BL8;
  71         popts->bstopre = 0;             /* enable auto precharge */
  72
  73         /*
  74          * Factors to consider for half-strength driver enable:
  75          *      - number of DIMMs installed
  76          */
  77         popts->half_strength_driver_enable = 0;
  78         /*
  79          * Write leveling override
  80          */
  81         popts->wrlvl_override = 1;
  82         popts->wrlvl_sample = 0xf;
  83
  84         /*
  85          * Rtt and Rtt_WR override
  86          */
  87         popts->rtt_override = 0;
  88
  89         /* Enable ZQ calibration */
  90         popts->zq_en = 1;
  91
  92         popts->ddr_cdr1 = DDR_CDR1_DHC_EN | DDR_CDR1_ODT(DDR_CDR_ODT_80ohm);
  93         popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_80ohm) |
  94                           DDR_CDR2_VREF_TRAIN_EN | DDR_CDR2_VREF_RANGE_2;
  95
  96         /* optimize cpo for erratum A-009942 */
  97         popts->cpo_sample = 0x70;
  98 }
  99
 100 int fsl_initdram(void)
 101 {
 102         phys_size_t dram_size;
 103
 104 #if defined(CONFIG_SPL) && !defined(CONFIG_SPL_BUILD)
 105         gd->ram_size = fsl_ddr_sdram_size();
 106
 107         return 0;
 108 #else
 109         puts("Initializing DDR....using SPD\n");
 110
 111         dram_size = fsl_ddr_sdram();
 112 #endif
 113
 114         erratum_a008850_post();
 115
 116         gd->ram_size = dram_size;
 117
 118         return 0;
 119 }