board/freescale/ls2080a/ddr.c

   1 /*
   2  * Copyright 2014 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         const struct board_specific_parameters *pbsp, *pbsp_highest = NULL;
  20         ulong ddr_freq;
  21
  22         if (ctrl_num > 3) {
  23                 printf("Not supported controller number %d\n", ctrl_num);
  24                 return;
  25         }
  26         if (!pdimm->n_ranks)
  27                 return;
  28
  29         /*
  30          * we use identical timing for all slots. If needed, change the code
  31          * to  pbsp = rdimms[ctrl_num] or pbsp = udimms[ctrl_num];
  32          */
  33         if (popts->registered_dimm_en)
  34                 pbsp = rdimms[ctrl_num];
  35         else
  36                 pbsp = udimms[ctrl_num];
  37
  38
  39         /* Get clk_adjust, wrlvl_start, wrlvl_ctl, according to the board ddr
  40          * freqency and n_banks specified in board_specific_parameters table.
  41          */
  42         ddr_freq = get_ddr_freq(0) / 1000000;
  43         while (pbsp->datarate_mhz_high) {
  44                 if (pbsp->n_ranks == pdimm->n_ranks &&
  45                     (pdimm->rank_density >> 30) >= pbsp->rank_gb) {
  46                         if (ddr_freq <= pbsp->datarate_mhz_high) {
  47                                 popts->clk_adjust = pbsp->clk_adjust;
  48                                 popts->wrlvl_start = pbsp->wrlvl_start;
  49                                 popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2;
  50                                 popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3;
  51                                 goto found;
  52                         }
  53                         pbsp_highest = pbsp;
  54                 }
  55                 pbsp++;
  56         }
  57
  58         if (pbsp_highest) {
  59                 printf("Error: board specific timing not found for data rate %lu MT/s\n"
  60                         "Trying to use the highest speed (%u) parameters\n",
  61                         ddr_freq, pbsp_highest->datarate_mhz_high);
  62                 popts->clk_adjust = pbsp_highest->clk_adjust;
  63                 popts->wrlvl_start = pbsp_highest->wrlvl_start;
  64                 popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2;
  65                 popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3;
  66         } else {
  67                 panic("DIMM is not supported by this board");
  68         }
  69 found:
  70         debug("Found timing match: n_ranks %d, data rate %d, rank_gb %d\n"
  71                 "\tclk_adjust %d, wrlvl_start %d, wrlvl_ctrl_2 0x%x, wrlvl_ctrl_3 0x%x\n",
  72                 pbsp->n_ranks, pbsp->datarate_mhz_high, pbsp->rank_gb,
  73                 pbsp->clk_adjust, pbsp->wrlvl_start, pbsp->wrlvl_ctl_2,
  74                 pbsp->wrlvl_ctl_3);
  75 #ifdef CONFIG_SYS_FSL_HAS_DP_DDR
  76         if (ctrl_num == CONFIG_DP_DDR_CTRL) {
  77                 /* force DDR bus width to 32 bits */
  78                 popts->data_bus_width = 1;
  79                 popts->otf_burst_chop_en = 0;
  80                 popts->burst_length = DDR_BL8;
  81                 popts->bstopre = 0;     /* enable auto precharge */
  82         }
  83 #endif
  84         /*
  85          * Factors to consider for half-strength driver enable:
  86          *      - number of DIMMs installed
  87          */
  88         popts->half_strength_driver_enable = 1;
  89         /*
  90          * Write leveling override
  91          */
  92         popts->wrlvl_override = 1;
  93         popts->wrlvl_sample = 0xf;
  94
  95         /*
  96          * Rtt and Rtt_WR override
  97          */
  98         popts->rtt_override = 0;
  99
 100         /* Enable ZQ calibration */
 101         popts->zq_en = 1;
 102
 103 #ifdef CONFIG_SYS_FSL_DDR4
 104         popts->ddr_cdr1 = DDR_CDR1_DHC_EN | DDR_CDR1_ODT(DDR_CDR_ODT_80ohm);
 105         popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_80ohm) |
 106                           DDR_CDR2_VREF_OVRD(70);       /* Vref = 70% */
 107 #else
 108         /* DHC_EN =1, ODT = 75 Ohm */
 109         popts->ddr_cdr1 = DDR_CDR1_DHC_EN | DDR_CDR1_ODT(DDR_CDR_ODT_75ohm);
 110         popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_75ohm);
 111 #endif
 112 }
 113
 114 #ifdef CONFIG_SYS_DDR_RAW_TIMING
 115 dimm_params_t ddr_raw_timing = {
 116         .n_ranks = 2,
 117         .rank_density = 1073741824u,
 118         .capacity = 2147483648,
 119         .primary_sdram_width = 64,
 120         .ec_sdram_width = 0,
 121         .registered_dimm = 0,
 122         .mirrored_dimm = 0,
 123         .n_row_addr = 14,
 124         .n_col_addr = 10,
 125         .n_banks_per_sdram_device = 8,
 126         .edc_config = 0,
 127         .burst_lengths_bitmask = 0x0c,
 128
 129         .tckmin_x_ps = 937,
 130         .caslat_x = 0x6FC << 4,  /* 14,13,11,10,9,8,7,6 */
 131         .taa_ps = 13090,
 132         .twr_ps = 15000,
 133         .trcd_ps = 13090,
 134         .trrd_ps = 5000,
 135         .trp_ps = 13090,
 136         .tras_ps = 33000,
 137         .trc_ps = 46090,
 138         .trfc_ps = 160000,
 139         .twtr_ps = 7500,
 140         .trtp_ps = 7500,
 141         .refresh_rate_ps = 7800000,
 142         .tfaw_ps = 25000,
 143 };
 144
 145 int fsl_ddr_get_dimm_params(dimm_params_t *pdimm,
 146                 unsigned int controller_number,
 147                 unsigned int dimm_number)
 148 {
 149         const char dimm_model[] = "Fixed DDR on board";
 150
 151         if (((controller_number == 0) && (dimm_number == 0)) ||
 152             ((controller_number == 1) && (dimm_number == 0))) {
 153                 memcpy(pdimm, &ddr_raw_timing, sizeof(dimm_params_t));
 154                 memset(pdimm->mpart, 0, sizeof(pdimm->mpart));
 155                 memcpy(pdimm->mpart, dimm_model, sizeof(dimm_model) - 1);
 156         }
 157
 158         return 0;
 159 }
 160 #endif
 161 int initdram(void)
 162 {
 163         puts("Initializing DDR....");
 164
 165         puts("using SPD\n");
 166         gd->ram_size = fsl_ddr_sdram();
 167
 168         return 0;
 169 }