board/freescale/t208xrdb/ddr.c

   1 /*
   2  * Copyright 2014 Freescale Semiconductor, Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * Version 2 or later as published by the Free Software Foundation.
   7  */
   8
   9 #include <common.h>
  10 #include <i2c.h>
  11 #include <hwconfig.h>
  12 #include <asm/mmu.h>
  13 #include <fsl_ddr_sdram.h>
  14 #include <fsl_ddr_dimm_params.h>
  15 #include <asm/fsl_law.h>
  16 #include "ddr.h"
  17
  18 DECLARE_GLOBAL_DATA_PTR;
  19
  20 void fsl_ddr_board_options(memctl_options_t *popts,
  21                                 dimm_params_t *pdimm,
  22                                 unsigned int ctrl_num)
  23 {
  24         const struct board_specific_parameters *pbsp, *pbsp_highest = NULL;
  25         ulong ddr_freq;
  26
  27         if (ctrl_num > 1) {
  28                 printf("Not supported controller number %d\n", ctrl_num);
  29                 return;
  30         }
  31         if (!pdimm->n_ranks)
  32                 return;
  33
  34         pbsp = udimms[0];
  35
  36         /* Get clk_adjust, wrlvl_start, wrlvl_ctl, according to the board ddr
  37          * freqency and n_banks specified in board_specific_parameters table.
  38          */
  39         ddr_freq = get_ddr_freq(0) / 1000000;
  40         while (pbsp->datarate_mhz_high) {
  41                 if (pbsp->n_ranks == pdimm->n_ranks &&
  42                     (pdimm->rank_density >> 30) >= pbsp->rank_gb) {
  43                         if (ddr_freq <= pbsp->datarate_mhz_high) {
  44                                 popts->clk_adjust = pbsp->clk_adjust;
  45                                 popts->wrlvl_start = pbsp->wrlvl_start;
  46                                 popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2;
  47                                 popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3;
  48                                 goto found;
  49                         }
  50                         pbsp_highest = pbsp;
  51                 }
  52                 pbsp++;
  53         }
  54
  55         if (pbsp_highest) {
  56                 printf("Error: board specific timing not found");
  57                 printf("for data rate %lu MT/s\n", ddr_freq);
  58                 printf("Trying to use the highest speed (%u) parameters\n",
  59                        pbsp_highest->datarate_mhz_high);
  60                 popts->clk_adjust = pbsp_highest->clk_adjust;
  61                 popts->wrlvl_start = pbsp_highest->wrlvl_start;
  62                 popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2;
  63                 popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3;
  64         } else {
  65                 panic("DIMM is not supported by this board");
  66         }
  67 found:
  68         debug("Found timing match: n_ranks %d, data rate %d, rank_gb %d\n"
  69                 "\tclk_adjust %d, wrlvl_start %d, wrlvl_ctrl_2 0x%x, "
  70                 "wrlvl_ctrl_3 0x%x\n",
  71                 pbsp->n_ranks, pbsp->datarate_mhz_high, pbsp->rank_gb,
  72                 pbsp->clk_adjust, pbsp->wrlvl_start, pbsp->wrlvl_ctl_2,
  73                 pbsp->wrlvl_ctl_3);
  74
  75         /*
  76          * Factors to consider for half-strength driver enable:
  77          *      - number of DIMMs installed
  78          */
  79         popts->half_strength_driver_enable = 0;
  80         /*
  81          * Write leveling override
  82          */
  83         popts->wrlvl_override = 1;
  84         popts->wrlvl_sample = 0xf;
  85
  86         /*
  87          * Rtt and Rtt_WR override
  88          */
  89         popts->rtt_override = 0;
  90
  91         /* Enable ZQ calibration */
  92         popts->zq_en = 1;
  93
  94         /* DHC_EN =1, ODT = 75 Ohm */
  95         popts->ddr_cdr1 = DDR_CDR1_DHC_EN | DDR_CDR1_ODT(DDR_CDR_ODT_75ohm);
  96         popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_75ohm);
  97 }
  98
  99 phys_size_t initdram(int board_type)
 100 {
 101         phys_size_t dram_size;
 102
 103         puts("Initializing....using SPD\n");
 104
 105         dram_size = fsl_ddr_sdram();
 106
 107         dram_size = setup_ddr_tlbs(dram_size / 0x100000);
 108         dram_size *= 0x100000;
 109
 110         puts("    DDR: ");
 111         return dram_size;
 112 }