git.sur5r.net Git - u-boot/blob - board/freescale/mpc8541cds/ddr.c

   1 /*
   2  * Copyright 2008 Freescale Semiconductor, Inc.
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0
   5  */
   6
   7 #include <common.h>
   8
   9 #include <fsl_ddr_sdram.h>
  10 #include <fsl_ddr_dimm_params.h>
  11
  12 void fsl_ddr_board_options(memctl_options_t *popts,
  13                                 dimm_params_t *pdimm,
  14                                 unsigned int ctrl_num)
  15 {
  16         /*
  17          * Factors to consider for clock adjust:
  18          *      - number of chips on bus
  19          *      - position of slot
  20          *      - DDR1 vs. DDR2?
  21          *      - ???
  22          *
  23          * This needs to be determined on a board-by-board basis.
  24          *      0110    3/4 cycle late
  25          *      0111    7/8 cycle late
  26          */
  27         popts->clk_adjust = 6;
  28
  29         /*
  30          * Factors to consider for CPO:
  31          *      - frequency
  32          *      - ddr1 vs. ddr2
  33          */
  34         popts->cpo_override = 0;
  35
  36         /*
  37          * Factors to consider for write data delay:
  38          *      - number of DIMMs
  39          *
  40          * 1 = 1/4 clock delay
  41          * 2 = 1/2 clock delay
  42          * 3 = 3/4 clock delay
  43          * 4 = 1   clock delay
  44          * 5 = 5/4 clock delay
  45          * 6 = 3/2 clock delay
  46          */
  47         popts->write_data_delay = 3;
  48
  49         /*
  50          * Factors to consider for half-strength driver enable:
  51          *      - number of DIMMs installed
  52          */
  53         popts->half_strength_driver_enable = 0;
  54 }