board/freescale/t208xqds/ddr.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright 2013 Freescale Semiconductor, Inc.
   4  */
   5
   6 #include <common.h>
   7 #include <i2c.h>
   8 #include <hwconfig.h>
   9 #include <asm/mmu.h>
  10 #include <fsl_ddr_sdram.h>
  11 #include <fsl_ddr_dimm_params.h>
  12 #include <asm/fsl_law.h>
  13 #include "ddr.h"
  14
  15 DECLARE_GLOBAL_DATA_PTR;
  16
  17 void fsl_ddr_board_options(memctl_options_t *popts,
  18                                 dimm_params_t *pdimm,
  19                                 unsigned int ctrl_num)
  20 {
  21         const struct board_specific_parameters *pbsp, *pbsp_highest = NULL;
  22         ulong ddr_freq;
  23
  24         if (ctrl_num > 1) {
  25                 printf("Not supported controller number %d\n", ctrl_num);
  26                 return;
  27         }
  28         if (!pdimm->n_ranks)
  29                 return;
  30
  31         /*
  32          * we use identical timing for all slots. If needed, change the code
  33          * to  pbsp = rdimms[ctrl_num] or pbsp = udimms[ctrl_num];
  34          */
  35         if (popts->registered_dimm_en)
  36                 pbsp = rdimms[0];
  37         else
  38                 pbsp = udimms[0];
  39
  40         /* Get clk_adjust, wrlvl_start, wrlvl_ctl, according to the board ddr
  41          * freqency and n_banks specified in board_specific_parameters table.
  42          */
  43         ddr_freq = get_ddr_freq(0) / 1000000;
  44         while (pbsp->datarate_mhz_high) {
  45                 if (pbsp->n_ranks == pdimm->n_ranks &&
  46                     (pdimm->rank_density >> 30) >= pbsp->rank_gb) {
  47                         if (ddr_freq <= pbsp->datarate_mhz_high) {
  48                                 popts->clk_adjust = pbsp->clk_adjust;
  49                                 popts->wrlvl_start = pbsp->wrlvl_start;
  50                                 popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2;
  51                                 popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3;
  52                                 goto found;
  53                         }
  54                         pbsp_highest = pbsp;
  55                 }
  56                 pbsp++;
  57         }
  58
  59         if (pbsp_highest) {
  60                 printf("Error: board specific timing not found");
  61                 printf("for data rate %lu MT/s\n", ddr_freq);
  62                 printf("Trying to use the highest speed (%u) parameters\n",
  63                        pbsp_highest->datarate_mhz_high);
  64                 popts->clk_adjust = pbsp_highest->clk_adjust;
  65                 popts->wrlvl_start = pbsp_highest->wrlvl_start;
  66                 popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2;
  67                 popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3;
  68         } else {
  69                 panic("DIMM is not supported by this board");
  70         }
  71 found:
  72         debug("Found timing match: n_ranks %d, data rate %d, rank_gb %d\n"
  73                 "\tclk_adjust %d, wrlvl_start %d, wrlvl_ctrl_2 0x%x, "
  74                 "wrlvl_ctrl_3 0x%x\n",
  75                 pbsp->n_ranks, pbsp->datarate_mhz_high, pbsp->rank_gb,
  76                 pbsp->clk_adjust, pbsp->wrlvl_start, pbsp->wrlvl_ctl_2,
  77                 pbsp->wrlvl_ctl_3);
  78
  79         /*
  80          * Factors to consider for half-strength driver enable:
  81          *      - number of DIMMs installed
  82          */
  83         popts->half_strength_driver_enable = 0;
  84         /*
  85          * Write leveling override
  86          */
  87         popts->wrlvl_override = 1;
  88         popts->wrlvl_sample = 0xf;
  89
  90         /*
  91          * Rtt and Rtt_WR override
  92          */
  93         popts->rtt_override = 0;
  94
  95         /* Enable ZQ calibration */
  96         popts->zq_en = 1;
  97
  98         /* DHC_EN =1, ODT = 75 Ohm */
  99         popts->ddr_cdr1 = DDR_CDR1_DHC_EN | DDR_CDR1_ODT(DDR_CDR_ODT_75ohm);
 100         popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_75ohm);
 101
 102         /* optimize cpo for erratum A-009942 */
 103         popts->cpo_sample = 0x64;
 104 }
 105
 106 int dram_init(void)
 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 #else
 114         /* DDR has been initialised by first stage boot loader */
 115         dram_size =  fsl_ddr_sdram_size();
 116 #endif
 117         dram_size = setup_ddr_tlbs(dram_size / 0x100000);
 118         dram_size *= 0x100000;
 119
 120         gd->ram_size = dram_size;
 121
 122         return 0;
 123 }