board/freescale/p2041rdb/ddr.c

   1 /*
   2  * Copyright 2011 Freescale Semiconductor, Inc.
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0
   5  */
   6
   7 #include <common.h>
   8 #include <i2c.h>
   9 #include <hwconfig.h>
  10 #include <asm/mmu.h>
  11 #include <fsl_ddr_sdram.h>
  12 #include <fsl_ddr_dimm_params.h>
  13 #include <asm/fsl_law.h>
  14
  15 struct board_specific_parameters {
  16         u32 n_ranks;
  17         u32 datarate_mhz_high;
  18         u32 clk_adjust;
  19         u32 wrlvl_start;
  20         u32 cpo;
  21         u32 write_data_delay;
  22         u32 force_2t;
  23 };
  24
  25 /*
  26  * This table contains all valid speeds we want to override with board
  27  * specific parameters. datarate_mhz_high values need to be in ascending order
  28  * for each n_ranks group.
  29  *
  30  * ranges for parameters:
  31  *  wr_data_delay = 0-6
  32  *  clk adjust = 0-8
  33  *  cpo 2-0x1E (30)
  34  */
  35 static const struct board_specific_parameters dimm0[] = {
  36         /*
  37          * memory controller 0
  38          *   num|  hi|  clk| wrlvl | cpo  |wrdata|2T
  39          * ranks| mhz|adjst| start | delay|
  40          */
  41         {2,   750,    3,     5,   0xff,    2,  0},
  42         {2,  1250,    4,     6,   0xff,    2,  0},
  43         {2,  1350,    5,     7,   0xff,    2,  0},
  44         {2,  1666,    5,     8,   0xff,    2,  0},
  45         {}
  46 };
  47
  48 void fsl_ddr_board_options(memctl_options_t *popts,
  49                                 dimm_params_t *pdimm,
  50                                 unsigned int ctrl_num)
  51 {
  52         const struct board_specific_parameters *pbsp, *pbsp_highest = NULL;
  53         ulong ddr_freq;
  54
  55         if (ctrl_num) {
  56                 printf("Wrong parameter for controller number %d", ctrl_num);
  57                 return;
  58         }
  59         if (!pdimm->n_ranks)
  60                 return;
  61
  62         pbsp = dimm0;
  63
  64         /*
  65          * Get clk_adjust, cpo, write_data_delay,2T, according to the board ddr
  66          * freqency and n_banks specified in board_specific_parameters table.
  67          */
  68         ddr_freq = get_ddr_freq(0) / 1000000;
  69         while (pbsp->datarate_mhz_high) {
  70                 if (pbsp->n_ranks == pdimm->n_ranks) {
  71                         if (ddr_freq <= pbsp->datarate_mhz_high) {
  72                                 popts->cpo_override = pbsp->cpo;
  73                                 popts->write_data_delay =
  74                                         pbsp->write_data_delay;
  75                                 popts->clk_adjust = pbsp->clk_adjust;
  76                                 popts->wrlvl_start = pbsp->wrlvl_start;
  77                                 popts->twot_en = pbsp->force_2t;
  78                                 goto found;
  79                         }
  80                         pbsp_highest = pbsp;
  81                 }
  82                 pbsp++;
  83         }
  84
  85         if (pbsp_highest) {
  86                 printf("Error: board specific timing not found "
  87                         "for data rate %lu MT/s!\n"
  88                         "Trying to use the highest speed (%u) parameters\n",
  89                         ddr_freq, pbsp_highest->datarate_mhz_high);
  90                 popts->cpo_override = pbsp_highest->cpo;
  91                 popts->write_data_delay = pbsp_highest->write_data_delay;
  92                 popts->clk_adjust = pbsp_highest->clk_adjust;
  93                 popts->wrlvl_start = pbsp_highest->wrlvl_start;
  94                 popts->twot_en = pbsp_highest->force_2t;
  95         } else {
  96                 panic("DIMM is not supported by this board");
  97         }
  98
  99 found:
 100         /*
 101          * Factors to consider for half-strength driver enable:
 102          *      - number of DIMMs installed
 103          */
 104         popts->half_strength_driver_enable = 0;
 105         /* Write leveling override */
 106         popts->wrlvl_override = 1;
 107         popts->wrlvl_sample = 0xf;
 108
 109         /* Rtt and Rtt_WR override */
 110         popts->rtt_override = 0;
 111
 112         /* Enable ZQ calibration */
 113         popts->zq_en = 1;
 114
 115         /* DHC_EN =1, ODT = 60 Ohm */
 116         popts->ddr_cdr1 = DDR_CDR1_DHC_EN;
 117 }
 118
 119 phys_size_t initdram(int board_type)
 120 {
 121         phys_size_t dram_size = 0;
 122
 123         puts("Initializing....");
 124
 125         if (fsl_use_spd()) {
 126                 puts("using SPD\n");
 127                 dram_size = fsl_ddr_sdram();
 128         } else {
 129                 puts("no SPD and fixed parameters\n");
 130                 return dram_size;
 131         }
 132
 133         dram_size = setup_ddr_tlbs(dram_size / 0x100000);
 134         dram_size *= 0x100000;
 135
 136         debug("    DDR: ");
 137         return dram_size;
 138 }