LXR uboot/board/freescale/mpc8641hpcn/ddr.c

   1/*
   2 * Copyright 2008,2011 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 <asm/fsl_ddr_sdram.h>
  12#include <asm/fsl_ddr_dimm_params.h>
  13
  14struct board_specific_parameters {
  15        u32 n_ranks;
  16        u32 datarate_mhz_high;
  17        u32 clk_adjust;
  18        u32 cpo;
  19        u32 write_data_delay;
  20};
  21
  22/*
  23 * This table contains all valid speeds we want to override with board
  24 * specific parameters. datarate_mhz_high values need to be in ascending order
  25 * for each n_ranks group.
  26 */
  27const struct board_specific_parameters dimm0[] = {
  28        /*
  29         * memory controller 0
  30         *   num|  hi|  clk| cpo|wrdata|2T
  31         * ranks| mhz|adjst|    | delay|
  32         */
  33        {4,  333,    7,   7,     3},
  34        {4,  549,    7,   9,     3},
  35        {4,  650,    7,  10,     4},
  36        {2,  333,    7,   7,     3},
  37        {2,  549,    7,   9,     3},
  38        {2,  650,    7,  10,     4},
  39        {1,  333,    7,   7,     3},
  40        {1,  549,    7,   9,     3},
  41        {1,  650,    7,  10,     4},
  42        {}
  43};
  44
  45/*
  46 * The two slots have slightly different timing. The center values are good
  47 * for both slots. We use identical speed tables for them. In future use, if
  48 * DIMMs have fewer center values that require two separated tables, copy the
  49 * udimm0 table to udimm1 and make changes to clk_adjust and wrlvl_start.
  50 */
  51const struct board_specific_parameters *dimms[] = {
  52        dimm0,
  53        dimm0,
  54};
  55
  56void fsl_ddr_board_options(memctl_options_t *popts,
  57                        dimm_params_t *pdimm,
  58                        unsigned int ctrl_num)
  59{
  60        const struct board_specific_parameters *pbsp, *pbsp_highest = NULL;
  61        unsigned int i;
  62        ulong ddr_freq;
  63
  64        if (ctrl_num > 1) {
  65                printf("Wrong parameter for controller number %d", ctrl_num);
  66                return;
  67        }
  68        for (i = 0; i < CONFIG_DIMM_SLOTS_PER_CTLR; i++) {
  69                if (pdimm[i].n_ranks)
  70                        break;
  71        }
  72        if (i >= CONFIG_DIMM_SLOTS_PER_CTLR)    /* no DIMM */
  73                return;
  74
  75        pbsp = dimms[ctrl_num];
  76
  77        /* Get clk_adjust, cpo, write_data_delay, according to the board ddr
  78         * freqency and n_banks specified in board_specific_parameters table.
  79         */
  80        ddr_freq = get_ddr_freq(0) / 1000000;
  81        while (pbsp->datarate_mhz_high) {
  82                if (pbsp->n_ranks == pdimm[i].n_ranks) {
  83                        if (ddr_freq <= pbsp->datarate_mhz_high) {
  84                                popts->clk_adjust = pbsp->clk_adjust;
  85                                popts->cpo_override = pbsp->cpo;
  86                                popts->write_data_delay =
  87                                        pbsp->write_data_delay;
  88                                goto found;
  89                        }
  90                        pbsp_highest = pbsp;
  91                }
  92                pbsp++;
  93        }
  94
  95        if (pbsp_highest) {
  96                printf("Error: board specific timing not found "
  97                        "for data rate %lu MT/s!\n"
  98                        "Trying to use the highest speed (%u) parameters\n",
  99                        ddr_freq, pbsp_highest->datarate_mhz_high);
 100                popts->clk_adjust = pbsp_highest->clk_adjust;
 101                popts->cpo_override = pbsp_highest->cpo;
 102                popts->write_data_delay = pbsp_highest->write_data_delay;
 103        } else {
 104                panic("DIMM is not supported by this board");
 105        }
 106
 107found:
 108        /* 2T timing enable */
 109        popts->twoT_en = 1;
 110}
 111