board/freescale/t208xqds/ddr.c

   1 /*
   2  * Copyright 2013 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         /*
  35          * we use identical timing for all slots. If needed, change the code
  36          * to  pbsp = rdimms[ctrl_num] or pbsp = udimms[ctrl_num];
  37          */
  38         if (popts->registered_dimm_en)
  39                 pbsp = rdimms[0];
  40         else
  41                 pbsp = udimms[0];
  42
  43         /* Get clk_adjust, wrlvl_start, wrlvl_ctl, according to the board ddr
  44          * freqency and n_banks specified in board_specific_parameters table.
  45          */
  46         ddr_freq = get_ddr_freq(0) / 1000000;
  47         while (pbsp->datarate_mhz_high) {
  48                 if (pbsp->n_ranks == pdimm->n_ranks &&
  49                     (pdimm->rank_density >> 30) >= pbsp->rank_gb) {
  50                         if (ddr_freq <= pbsp->datarate_mhz_high) {
  51                                 popts->clk_adjust = pbsp->clk_adjust;
  52                                 popts->wrlvl_start = pbsp->wrlvl_start;
  53                                 popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2;
  54                                 popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3;
  55                                 goto found;
  56                         }
  57                         pbsp_highest = pbsp;
  58                 }
  59                 pbsp++;
  60         }
  61
  62         if (pbsp_highest) {
  63                 printf("Error: board specific timing not found");
  64                 printf("for data rate %lu MT/s\n", ddr_freq);
  65                 printf("Trying to use the highest speed (%u) parameters\n",
  66                        pbsp_highest->datarate_mhz_high);
  67                 popts->clk_adjust = pbsp_highest->clk_adjust;
  68                 popts->wrlvl_start = pbsp_highest->wrlvl_start;
  69                 popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2;
  70                 popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3;
  71         } else {
  72                 panic("DIMM is not supported by this board");
  73         }
  74 found:
  75         debug("Found timing match: n_ranks %d, data rate %d, rank_gb %d\n"
  76                 "\tclk_adjust %d, wrlvl_start %d, wrlvl_ctrl_2 0x%x, "
  77                 "wrlvl_ctrl_3 0x%x\n",
  78                 pbsp->n_ranks, pbsp->datarate_mhz_high, pbsp->rank_gb,
  79                 pbsp->clk_adjust, pbsp->wrlvl_start, pbsp->wrlvl_ctl_2,
  80                 pbsp->wrlvl_ctl_3);
  81
  82         /*
  83          * Factors to consider for half-strength driver enable:
  84          *      - number of DIMMs installed
  85          */
  86         popts->half_strength_driver_enable = 0;
  87         /*
  88          * Write leveling override
  89          */
  90         popts->wrlvl_override = 1;
  91         popts->wrlvl_sample = 0xf;
  92
  93         /*
  94          * Rtt and Rtt_WR override
  95          */
  96         popts->rtt_override = 0;
  97
  98         /* Enable ZQ calibration */
  99         popts->zq_en = 1;
 100
 101         /* DHC_EN =1, ODT = 75 Ohm */
 102         popts->ddr_cdr1 = DDR_CDR1_DHC_EN | DDR_CDR1_ODT(DDR_CDR_ODT_75ohm);
 103         popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_75ohm);
 104 }
 105
 106 phys_size_t initdram(int board_type)
 107 {
 108         phys_size_t dram_size;
 109
 110 #if defined(CONFIG_SPL_BUILD) || !defined(CONFIG_RAMBOOT_PBL)
 111         puts("Initializing....using SPD\n");
 112         dram_size = fsl_ddr_sdram();
 113
 114         dram_size = setup_ddr_tlbs(dram_size / 0x100000);
 115         dram_size *= 0x100000;
 116 #else
 117         /* DDR has been initialised by first stage boot loader */
 118         dram_size =  fsl_ddr_sdram_size();
 119 #endif
 120
 121         return dram_size;
 122 }