board/freescale/ls2080ardb/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 #include <asm/arch/soc.h>
  11 #include "ddr.h"
  12
  13 DECLARE_GLOBAL_DATA_PTR;
  14
  15 void fsl_ddr_board_options(memctl_options_t *popts,
  16                                 dimm_params_t *pdimm,
  17                                 unsigned int ctrl_num)
  18 {
  19 #ifdef CONFIG_SYS_FSL_HAS_DP_DDR
  20         u8 dq_mapping_0, dq_mapping_2, dq_mapping_3;
  21 #endif
  22         const struct board_specific_parameters *pbsp, *pbsp_highest = NULL;
  23         ulong ddr_freq;
  24         int slot;
  25
  26         if (ctrl_num > 2) {
  27                 printf("Not supported controller number %d\n", ctrl_num);
  28                 return;
  29         }
  30
  31         for (slot = 0; slot < CONFIG_DIMM_SLOTS_PER_CTLR; slot++) {
  32                 if (pdimm[slot].n_ranks)
  33                         break;
  34         }
  35
  36         if (slot >= CONFIG_DIMM_SLOTS_PER_CTLR)
  37                 return;
  38
  39         /*
  40          * we use identical timing for all slots. If needed, change the code
  41          * to  pbsp = rdimms[ctrl_num] or pbsp = udimms[ctrl_num];
  42          */
  43         if (popts->registered_dimm_en)
  44                 pbsp = rdimms[ctrl_num];
  45         else
  46                 pbsp = udimms[ctrl_num];
  47
  48
  49         /* Get clk_adjust, wrlvl_start, wrlvl_ctl, according to the board ddr
  50          * freqency and n_banks specified in board_specific_parameters table.
  51          */
  52         ddr_freq = get_ddr_freq(ctrl_num) / 1000000;
  53         while (pbsp->datarate_mhz_high) {
  54                 if (pbsp->n_ranks == pdimm[slot].n_ranks &&
  55                     (pdimm[slot].rank_density >> 30) >= pbsp->rank_gb) {
  56                         if (ddr_freq <= pbsp->datarate_mhz_high) {
  57                                 popts->clk_adjust = pbsp->clk_adjust;
  58                                 popts->wrlvl_start = pbsp->wrlvl_start;
  59                                 popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2;
  60                                 popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3;
  61                                 goto found;
  62                         }
  63                         pbsp_highest = pbsp;
  64                 }
  65                 pbsp++;
  66         }
  67
  68         if (pbsp_highest) {
  69                 printf("Error: board specific timing not found for data rate %lu MT/s\n"
  70                         "Trying to use the highest speed (%u) parameters\n",
  71                         ddr_freq, pbsp_highest->datarate_mhz_high);
  72                 popts->clk_adjust = pbsp_highest->clk_adjust;
  73                 popts->wrlvl_start = pbsp_highest->wrlvl_start;
  74                 popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2;
  75                 popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3;
  76         } else {
  77                 panic("DIMM is not supported by this board");
  78         }
  79 found:
  80         debug("Found timing match: n_ranks %d, data rate %d, rank_gb %d\n"
  81                 "\tclk_adjust %d, wrlvl_start %d, wrlvl_ctrl_2 0x%x, wrlvl_ctrl_3 0x%x\n",
  82                 pbsp->n_ranks, pbsp->datarate_mhz_high, pbsp->rank_gb,
  83                 pbsp->clk_adjust, pbsp->wrlvl_start, pbsp->wrlvl_ctl_2,
  84                 pbsp->wrlvl_ctl_3);
  85 #ifdef CONFIG_SYS_FSL_HAS_DP_DDR
  86         if (ctrl_num == CONFIG_DP_DDR_CTRL) {
  87                 /* force DDR bus width to 32 bits */
  88                 popts->data_bus_width = 1;
  89                 popts->otf_burst_chop_en = 0;
  90                 popts->burst_length = DDR_BL8;
  91                 popts->bstopre = 0;     /* enable auto precharge */
  92                 /*
  93                  * Layout optimization results byte mapping
  94                  * Byte 0 -> Byte ECC
  95                  * Byte 1 -> Byte 3
  96                  * Byte 2 -> Byte 2
  97                  * Byte 3 -> Byte 1
  98                  * Byte ECC -> Byte 0
  99                  */
 100                 dq_mapping_0 = pdimm[slot].dq_mapping[0];
 101                 dq_mapping_2 = pdimm[slot].dq_mapping[2];
 102                 dq_mapping_3 = pdimm[slot].dq_mapping[3];
 103                 pdimm[slot].dq_mapping[0] = pdimm[slot].dq_mapping[8];
 104                 pdimm[slot].dq_mapping[1] = pdimm[slot].dq_mapping[9];
 105                 pdimm[slot].dq_mapping[2] = pdimm[slot].dq_mapping[6];
 106                 pdimm[slot].dq_mapping[3] = pdimm[slot].dq_mapping[7];
 107                 pdimm[slot].dq_mapping[6] = dq_mapping_2;
 108                 pdimm[slot].dq_mapping[7] = dq_mapping_3;
 109                 pdimm[slot].dq_mapping[8] = dq_mapping_0;
 110                 pdimm[slot].dq_mapping[9] = 0;
 111                 pdimm[slot].dq_mapping[10] = 0;
 112                 pdimm[slot].dq_mapping[11] = 0;
 113                 pdimm[slot].dq_mapping[12] = 0;
 114                 pdimm[slot].dq_mapping[13] = 0;
 115                 pdimm[slot].dq_mapping[14] = 0;
 116                 pdimm[slot].dq_mapping[15] = 0;
 117                 pdimm[slot].dq_mapping[16] = 0;
 118                 pdimm[slot].dq_mapping[17] = 0;
 119         }
 120 #endif
 121         /* To work at higher than 1333MT/s */
 122         popts->half_strength_driver_enable = 0;
 123         /*
 124          * Write leveling override
 125          */
 126         popts->wrlvl_override = 1;
 127         popts->wrlvl_sample = 0x0;      /* 32 clocks */
 128
 129         /*
 130          * Rtt and Rtt_WR override
 131          */
 132         popts->rtt_override = 0;
 133
 134         /* Enable ZQ calibration */
 135         popts->zq_en = 1;
 136
 137         /* optimize cpo for erratum A-009942 */
 138         popts->cpo_sample = 0x6e;
 139
 140         if (ddr_freq < 2350) {
 141                 if (pdimm[0].n_ranks == 2 && pdimm[1].n_ranks == 2) {
 142                         /* four chip-selects */
 143                         popts->ddr_cdr1 = DDR_CDR1_DHC_EN |
 144                                           DDR_CDR1_ODT(DDR_CDR_ODT_80ohm);
 145                         popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_80ohm);
 146                         popts->twot_en = 1;     /* enable 2T timing */
 147                 } else {
 148                         popts->ddr_cdr1 = DDR_CDR1_DHC_EN |
 149                                           DDR_CDR1_ODT(DDR_CDR_ODT_60ohm);
 150                         popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_60ohm) |
 151                                           DDR_CDR2_VREF_RANGE_2;
 152                 }
 153         } else {
 154                 popts->ddr_cdr1 = DDR_CDR1_DHC_EN |
 155                                   DDR_CDR1_ODT(DDR_CDR_ODT_100ohm);
 156                 popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_100ohm) |
 157                                   DDR_CDR2_VREF_RANGE_2;
 158         }
 159 }
 160
 161 int initdram(void)
 162 {
 163 #if defined(CONFIG_SPL) && !defined(CONFIG_SPL_BUILD)
 164         gd->ram_size = fsl_ddr_sdram_size();
 165 #else
 166         puts("Initializing DDR....using SPD\n");
 167
 168         gd->ram_size = fsl_ddr_sdram();
 169 #endif
 170
 171         return 0;
 172 }