board/freescale/p1022ds/ddr.c

   1 /*
   2  * Copyright 2010 Freescale Semiconductor, Inc.
   3  * Authors: Srikanth Srinivasan <srikanth.srinivasan@freescale.com>
   4  *          Timur Tabi <timur@freescale.com>
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 #include <common.h>
  10
  11 #include <fsl_ddr_sdram.h>
  12 #include <fsl_ddr_dimm_params.h>
  13
  14 struct board_specific_parameters {
  15         u32 n_ranks;
  16         u32 datarate_mhz_high;
  17         u32 clk_adjust;         /* Range: 0-8 */
  18         u32 cpo;                /* Range: 2-31 */
  19         u32 write_data_delay;   /* Range: 0-6 */
  20         u32 force_2t;
  21 };
  22
  23 /*
  24  * This table contains all valid speeds we want to override with board
  25  * specific parameters. datarate_mhz_high values need to be in ascending order
  26  * for each n_ranks group.
  27  */
  28 static const struct board_specific_parameters dimm0[] = {
  29         /*
  30          * memory controller 0
  31          *   num|  hi|  clk| cpo|wrdata|2T
  32          * ranks| mhz|adjst|    | delay|
  33          */
  34         {1,  549,    5,  31,     3, 0},
  35         {1,  850,    5,  31,     5, 0},
  36         {2,  549,    5,  31,     3, 0},
  37         {2,  850,    5,  31,     5, 0},
  38         {}
  39 };
  40
  41 void fsl_ddr_board_options(memctl_options_t *popts, dimm_params_t *pdimm,
  42                            unsigned int ctrl_num)
  43 {
  44         const struct board_specific_parameters *pbsp, *pbsp_highest = NULL;
  45         unsigned long ddr_freq;
  46         unsigned int i;
  47
  48
  49         if (ctrl_num) {
  50                 printf("Wrong parameter for controller number %d", ctrl_num);
  51                 return;
  52         }
  53         if (!pdimm->n_ranks)
  54                 return;
  55
  56         /* set odt_rd_cfg and odt_wr_cfg. */
  57         for (i = 0; i < CONFIG_CHIP_SELECTS_PER_CTRL; i++) {
  58                 popts->cs_local_opts[i].odt_rd_cfg = 0;
  59                 popts->cs_local_opts[i].odt_wr_cfg = 1;
  60         }
  61
  62         pbsp = dimm0;
  63         /*
  64          * Get clk_adjust, cpo, write_data_delay,2T, according to the board ddr
  65          * freqency and n_banks specified in board_specific_parameters table.
  66          */
  67         ddr_freq = get_ddr_freq(0) / 1000000;
  68         while (pbsp->datarate_mhz_high) {
  69                 if (pbsp->n_ranks == pdimm->n_ranks) {
  70                         if (ddr_freq <= pbsp->datarate_mhz_high) {
  71                                 popts->clk_adjust = pbsp->clk_adjust;
  72                                 popts->cpo_override = pbsp->cpo;
  73                                 popts->write_data_delay =
  74                                         pbsp->write_data_delay;
  75                                 popts->twot_en = pbsp->force_2t;
  76                                 goto found;
  77                         }
  78                         pbsp_highest = pbsp;
  79                 }
  80                 pbsp++;
  81         }
  82
  83         if (pbsp_highest) {
  84                 printf("Error: board specific timing not found "
  85                         "for data rate %lu MT/s!\n"
  86                         "Trying to use the highest speed (%u) parameters\n",
  87                         ddr_freq, pbsp_highest->datarate_mhz_high);
  88                 popts->clk_adjust = pbsp->clk_adjust;
  89                 popts->cpo_override = pbsp->cpo;
  90                 popts->write_data_delay = pbsp->write_data_delay;
  91                 popts->twot_en = pbsp->force_2t;
  92         } else {
  93                 panic("DIMM is not supported by this board");
  94         }
  95
  96 found:
  97         popts->half_strength_driver_enable = 1;
  98
  99         /* Per AN4039, enable ZQ calibration. */
 100         popts->zq_en = 1;
 101
 102         /*
 103          * For wake-up on ARP, we need auto self refresh enabled
 104          */
 105         popts->auto_self_refresh_en = 1;
 106         popts->sr_it = 0xb;
 107 }