board/freescale/mpc8560ads/ddr.c

   1 /*
   2  * Copyright 2008 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 as published by the Free Software Foundation.
   7  */
   8
   9 #include <common.h>
  10
  11 #include <fsl_ddr_sdram.h>
  12 #include <fsl_ddr_dimm_params.h>
  13
  14 void fsl_ddr_board_options(memctl_options_t *popts,
  15                                 dimm_params_t *pdimm,
  16                                 unsigned int ctrl_num)
  17 {
  18         /*
  19          * Factors to consider for CPO:
  20          *      - frequency
  21          *      - ddr1 vs. ddr2
  22          */
  23         popts->cpo_override = 0;
  24
  25         /*
  26          * Factors to consider for write data delay:
  27          *      - number of DIMMs
  28          *
  29          * 1 = 1/4 clock delay
  30          * 2 = 1/2 clock delay
  31          * 3 = 3/4 clock delay
  32          * 4 = 1   clock delay
  33          * 5 = 5/4 clock delay
  34          * 6 = 3/2 clock delay
  35          */
  36         popts->write_data_delay = 3;
  37
  38         /* 2T timing enable */
  39         popts->twot_en = 1;
  40
  41         /*
  42          * Factors to consider for half-strength driver enable:
  43          *      - number of DIMMs installed
  44          */
  45         popts->half_strength_driver_enable = 0;
  46 }