board/freescale/mpc8641hpcn/ddr.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright 2008,2011 Freescale Semiconductor, Inc.
   4  */
   5
   6 #include <common.h>
   7
   8 #include <fsl_ddr_sdram.h>
   9 #include <fsl_ddr_dimm_params.h>
  10
  11 struct board_specific_parameters {
  12         u32 n_ranks;
  13         u32 datarate_mhz_high;
  14         u32 clk_adjust;
  15         u32 cpo;
  16         u32 write_data_delay;
  17 };
  18
  19 /*
  20  * This table contains all valid speeds we want to override with board
  21  * specific parameters. datarate_mhz_high values need to be in ascending order
  22  * for each n_ranks group.
  23  */
  24 const struct board_specific_parameters dimm0[] = {
  25         /*
  26          * memory controller 0
  27          *   num|  hi|  clk| cpo|wrdata|2T
  28          * ranks| mhz|adjst|    | delay|
  29          */
  30         {4,  333,    7,   7,     3},
  31         {4,  549,    7,   9,     3},
  32         {4,  650,    7,  10,     4},
  33         {2,  333,    7,   7,     3},
  34         {2,  549,    7,   9,     3},
  35         {2,  650,    7,  10,     4},
  36         {1,  333,    7,   7,     3},
  37         {1,  549,    7,   9,     3},
  38         {1,  650,    7,  10,     4},
  39         {}
  40 };
  41
  42 /*
  43  * The two slots have slightly different timing. The center values are good
  44  * for both slots. We use identical speed tables for them. In future use, if
  45  * DIMMs have fewer center values that require two separated tables, copy the
  46  * udimm0 table to udimm1 and make changes to clk_adjust and wrlvl_start.
  47  */
  48 const struct board_specific_parameters *dimms[] = {
  49         dimm0,
  50         dimm0,
  51 };
  52
  53 void fsl_ddr_board_options(memctl_options_t *popts,
  54                         dimm_params_t *pdimm,
  55                         unsigned int ctrl_num)
  56 {
  57         const struct board_specific_parameters *pbsp, *pbsp_highest = NULL;
  58         unsigned int i;
  59         ulong ddr_freq;
  60
  61         if (ctrl_num > 1) {
  62                 printf("Wrong parameter for controller number %d", ctrl_num);
  63                 return;
  64         }
  65         for (i = 0; i < CONFIG_DIMM_SLOTS_PER_CTLR; i++) {
  66                 if (pdimm[i].n_ranks)
  67                         break;
  68         }
  69         if (i >= CONFIG_DIMM_SLOTS_PER_CTLR)    /* no DIMM */
  70                 return;
  71
  72         pbsp = dimms[ctrl_num];
  73
  74         /* Get clk_adjust, cpo, write_data_delay, according to the board ddr
  75          * freqency and n_banks specified in board_specific_parameters table.
  76          */
  77         ddr_freq = get_ddr_freq(0) / 1000000;
  78         while (pbsp->datarate_mhz_high) {
  79                 if (pbsp->n_ranks == pdimm[i].n_ranks) {
  80                         if (ddr_freq <= pbsp->datarate_mhz_high) {
  81                                 popts->clk_adjust = pbsp->clk_adjust;
  82                                 popts->cpo_override = pbsp->cpo;
  83                                 popts->write_data_delay =
  84                                         pbsp->write_data_delay;
  85                                 goto found;
  86                         }
  87                         pbsp_highest = pbsp;
  88                 }
  89                 pbsp++;
  90         }
  91
  92         if (pbsp_highest) {
  93                 printf("Error: board specific timing not found "
  94                         "for data rate %lu MT/s!\n"
  95                         "Trying to use the highest speed (%u) parameters\n",
  96                         ddr_freq, pbsp_highest->datarate_mhz_high);
  97                 popts->clk_adjust = pbsp_highest->clk_adjust;
  98                 popts->cpo_override = pbsp_highest->cpo;
  99                 popts->write_data_delay = pbsp_highest->write_data_delay;
 100         } else {
 101                 panic("DIMM is not supported by this board");
 102         }
 103
 104 found:
 105         /* 2T timing enable */
 106         popts->twot_en = 1;
 107 }