2 * Copyright 2008,2011 Freescale Semiconductor, Inc.
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.
11 #include <fsl_ddr_sdram.h>
12 #include <fsl_ddr_dimm_params.h>
14 struct board_specific_parameters {
16 u32 datarate_mhz_high;
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.
27 const struct board_specific_parameters dimm0[] = {
30 * num| hi| clk| cpo|wrdata|2T
31 * ranks| mhz|adjst| | delay|
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.
51 const struct board_specific_parameters *dimms[] = {
56 void fsl_ddr_board_options(memctl_options_t *popts,
58 unsigned int ctrl_num)
60 const struct board_specific_parameters *pbsp, *pbsp_highest = NULL;
65 printf("Wrong parameter for controller number %d", ctrl_num);
68 for (i = 0; i < CONFIG_DIMM_SLOTS_PER_CTLR; i++) {
72 if (i >= CONFIG_DIMM_SLOTS_PER_CTLR) /* no DIMM */
75 pbsp = dimms[ctrl_num];
77 /* Get clk_adjust, cpo, write_data_delay, according to the board ddr
78 * freqency and n_banks specified in board_specific_parameters table.
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;
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;
104 panic("DIMM is not supported by this board");
108 /* 2T timing enable */