board/freescale/ls2080aqds/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 <asm/arch/clock.h>
  12 #include "ddr.h"
  13
  14 DECLARE_GLOBAL_DATA_PTR;
  15
  16 void fsl_ddr_board_options(memctl_options_t *popts,
  17                                 dimm_params_t *pdimm,
  18                                 unsigned int ctrl_num)
  19 {
  20 #ifdef CONFIG_SYS_FSL_HAS_DP_DDR
  21         u8 dq_mapping_0, dq_mapping_2, dq_mapping_3;
  22 #endif
  23         const struct board_specific_parameters *pbsp, *pbsp_highest = NULL;
  24         ulong ddr_freq;
  25         int slot;
  26
  27         if (ctrl_num > 2) {
  28                 printf("Not supported controller number %d\n", ctrl_num);
  29                 return;
  30         }
  31
  32         for (slot = 0; slot < CONFIG_DIMM_SLOTS_PER_CTLR; slot++) {
  33                 if (pdimm[slot].n_ranks)
  34                         break;
  35         }
  36
  37         if (slot >= CONFIG_DIMM_SLOTS_PER_CTLR)
  38                 return;
  39
  40         /*
  41          * we use identical timing for all slots. If needed, change the code
  42          * to  pbsp = rdimms[ctrl_num] or pbsp = udimms[ctrl_num];
  43          */
  44         if (popts->registered_dimm_en)
  45                 pbsp = rdimms[ctrl_num];
  46         else
  47                 pbsp = udimms[ctrl_num];
  48
  49
  50         /* Get clk_adjust, wrlvl_start, wrlvl_ctl, according to the board ddr
  51          * freqency and n_banks specified in board_specific_parameters table.
  52          */
  53         ddr_freq = get_ddr_freq(ctrl_num) / 1000000;
  54         while (pbsp->datarate_mhz_high) {
  55                 if (pbsp->n_ranks == pdimm[slot].n_ranks &&
  56                     (pdimm[slot].rank_density >> 30) >= pbsp->rank_gb) {
  57                         if (ddr_freq <= pbsp->datarate_mhz_high) {
  58                                 popts->clk_adjust = pbsp->clk_adjust;
  59                                 popts->wrlvl_start = pbsp->wrlvl_start;
  60                                 popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2;
  61                                 popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3;
  62                                 goto found;
  63                         }
  64                         pbsp_highest = pbsp;
  65                 }
  66                 pbsp++;
  67         }
  68
  69         if (pbsp_highest) {
  70                 printf("Error: board specific timing not found for data rate %lu MT/s\n"
  71                         "Trying to use the highest speed (%u) parameters\n",
  72                         ddr_freq, pbsp_highest->datarate_mhz_high);
  73                 popts->clk_adjust = pbsp_highest->clk_adjust;
  74                 popts->wrlvl_start = pbsp_highest->wrlvl_start;
  75                 popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2;
  76                 popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3;
  77         } else {
  78                 panic("DIMM is not supported by this board");
  79         }
  80 found:
  81         debug("Found timing match: n_ranks %d, data rate %d, rank_gb %d\n"
  82                 "\tclk_adjust %d, wrlvl_start %d, wrlvl_ctrl_2 0x%x, wrlvl_ctrl_3 0x%x\n",
  83                 pbsp->n_ranks, pbsp->datarate_mhz_high, pbsp->rank_gb,
  84                 pbsp->clk_adjust, pbsp->wrlvl_start, pbsp->wrlvl_ctl_2,
  85                 pbsp->wrlvl_ctl_3);
  86 #ifdef CONFIG_SYS_FSL_HAS_DP_DDR
  87         if (ctrl_num == CONFIG_DP_DDR_CTRL) {
  88                 /* force DDR bus width to 32 bits */
  89                 popts->data_bus_width = 1;
  90                 popts->otf_burst_chop_en = 0;
  91                 popts->burst_length = DDR_BL8;
  92                 popts->bstopre = 0;     /* enable auto precharge */
  93                 /*
  94                  * Layout optimization results byte mapping
  95                  * Byte 0 -> Byte ECC
  96                  * Byte 1 -> Byte 3
  97                  * Byte 2 -> Byte 2
  98                  * Byte 3 -> Byte 1
  99                  * Byte ECC -> Byte 0
 100                  */
 101                 dq_mapping_0 = pdimm[slot].dq_mapping[0];
 102                 dq_mapping_2 = pdimm[slot].dq_mapping[2];
 103                 dq_mapping_3 = pdimm[slot].dq_mapping[3];
 104                 pdimm[slot].dq_mapping[0] = pdimm[slot].dq_mapping[8];
 105                 pdimm[slot].dq_mapping[1] = pdimm[slot].dq_mapping[9];
 106                 pdimm[slot].dq_mapping[2] = pdimm[slot].dq_mapping[6];
 107                 pdimm[slot].dq_mapping[3] = pdimm[slot].dq_mapping[7];
 108                 pdimm[slot].dq_mapping[6] = dq_mapping_2;
 109                 pdimm[slot].dq_mapping[7] = dq_mapping_3;
 110                 pdimm[slot].dq_mapping[8] = dq_mapping_0;
 111                 pdimm[slot].dq_mapping[9] = 0;
 112                 pdimm[slot].dq_mapping[10] = 0;
 113                 pdimm[slot].dq_mapping[11] = 0;
 114                 pdimm[slot].dq_mapping[12] = 0;
 115                 pdimm[slot].dq_mapping[13] = 0;
 116                 pdimm[slot].dq_mapping[14] = 0;
 117                 pdimm[slot].dq_mapping[15] = 0;
 118                 pdimm[slot].dq_mapping[16] = 0;
 119                 pdimm[slot].dq_mapping[17] = 0;
 120         }
 121 #endif
 122         /* To work at higher than 1333MT/s */
 123         popts->half_strength_driver_enable = 0;
 124         /*
 125          * Write leveling override
 126          */
 127         popts->wrlvl_override = 1;
 128         popts->wrlvl_sample = 0x0;      /* 32 clocks */
 129
 130         /*
 131          * Rtt and Rtt_WR override
 132          */
 133         popts->rtt_override = 0;
 134
 135         /* Enable ZQ calibration */
 136         popts->zq_en = 1;
 137
 138         if (ddr_freq < 2350) {
 139                 if (pdimm[0].n_ranks == 2 && pdimm[1].n_ranks == 2) {
 140                         /* four chip-selects */
 141                         popts->ddr_cdr1 = DDR_CDR1_DHC_EN |
 142                                           DDR_CDR1_ODT(DDR_CDR_ODT_80ohm);
 143                         popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_80ohm);
 144                         popts->twot_en = 1; /* enable 2T timing */
 145                 } else {
 146                         popts->ddr_cdr1 = DDR_CDR1_DHC_EN |
 147                                           DDR_CDR1_ODT(DDR_CDR_ODT_60ohm);
 148                         popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_60ohm) |
 149                                           DDR_CDR2_VREF_RANGE_2;
 150                 }
 151         } else {
 152                 popts->ddr_cdr1 = DDR_CDR1_DHC_EN |
 153                                   DDR_CDR1_ODT(DDR_CDR_ODT_100ohm);
 154                 popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_100ohm) |
 155                                   DDR_CDR2_VREF_RANGE_2;
 156         }
 157 }
 158
 159 int fsl_initdram(void)
 160 {
 161 #if defined(CONFIG_SPL) && !defined(CONFIG_SPL_BUILD)
 162         gd->ram_size = fsl_ddr_sdram_size();
 163 #else
 164         puts("Initializing DDR....using SPD\n");
 165
 166         gd->ram_size = fsl_ddr_sdram();
 167 #endif
 168
 169         return 0;
 170 }