2 * Copyright 2008-2009 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 <asm/fsl_ddr_sdram.h>
12 #include <asm/fsl_ddr_dimm_params.h>
14 struct board_specific_parameters {
16 u32 datarate_mhz_high;
25 * This table contains all valid speeds we want to override with board
26 * specific parameters. datarate_mhz_high values need to be in ascending order
27 * for each n_ranks group.
29 * ranges for parameters:
34 static const struct board_specific_parameters dimm0[] = {
37 * num| hi| clk| cpo|wrdata|2T
38 * ranks| mhz|adjst| | delay|
40 #ifdef CONFIG_FSL_DDR2
41 {2, 549, 4, 0x1f, 2, 0},
42 {2, 680, 4, 0x1f, 3, 0},
43 {2, 850, 4, 0x1f, 4, 0},
44 {1, 549, 4, 0x1f, 2, 0},
45 {1, 680, 4, 0x1f, 3, 0},
46 {1, 850, 4, 0x1f, 4, 0},
48 {2, 850, 6, 0x1f, 4, 0},
49 {1, 850, 4, 0x1f, 4, 0},
54 void fsl_ddr_board_options(memctl_options_t *popts,
56 unsigned int ctrl_num)
58 const struct board_specific_parameters *pbsp, *pbsp_highest = NULL;
62 printf("Wrong parameter for controller number %d", ctrl_num);
70 /* Get clk_adjust, cpo, write_data_delay,2T, according to the board ddr
71 * freqency and n_banks specified in board_specific_parameters table.
73 ddr_freq = get_ddr_freq(0) / 1000000;
74 while (pbsp->datarate_mhz_high) {
75 if (pbsp->n_ranks == pdimm->n_ranks) {
76 if (ddr_freq <= pbsp->datarate_mhz_high) {
77 popts->clk_adjust = pbsp->clk_adjust;
78 popts->cpo_override = pbsp->cpo;
79 popts->write_data_delay =
80 pbsp->write_data_delay;
81 popts->twoT_en = pbsp->force_2T;
90 printf("Error: board specific timing not found "
91 "for data rate %lu MT/s!\n"
92 "Trying to use the highest speed (%u) parameters\n",
93 ddr_freq, pbsp_highest->datarate_mhz_high);
94 popts->clk_adjust = pbsp_highest->clk_adjust;
95 popts->cpo_override = pbsp_highest->cpo;
96 popts->write_data_delay = pbsp_highest->write_data_delay;
97 popts->twoT_en = pbsp_highest->force_2T;
99 panic("DIMM is not supported by this board");
104 * Factors to consider for half-strength driver enable:
105 * - number of DIMMs installed
107 popts->half_strength_driver_enable = 0;
109 /* Write leveling override */
110 popts->wrlvl_override = 1;
111 popts->wrlvl_sample = 0xa;
112 popts->wrlvl_start = 0x8;
113 /* Rtt and Rtt_WR override */
114 popts->rtt_override = 1;
115 popts->rtt_override_value = DDR3_RTT_120_OHM;
116 popts->rtt_wr_override_value = 0; /* Rtt_WR= dynamic ODT off */