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5614e71b49
Freescale DDR driver has been used for mpc83xx, mpc85xx, mpc86xx SoCs. The similar DDR controllers will be used for ARM-based SoCs. Signed-off-by: York Sun <yorksun@freescale.com>
129 lines
3.4 KiB
C
129 lines
3.4 KiB
C
/*
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* Copyright 2008-2009 Freescale Semiconductor, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* Version 2 as published by the Free Software Foundation.
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*/
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#include <common.h>
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#include <fsl_ddr_sdram.h>
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#include <fsl_ddr_dimm_params.h>
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struct board_specific_parameters {
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u32 n_ranks;
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u32 datarate_mhz_high;
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u32 clk_adjust;
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u32 cpo;
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u32 write_data_delay;
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u32 force_2t;
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};
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/*
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* This table contains all valid speeds we want to override with board
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* specific parameters. datarate_mhz_high values need to be in ascending order
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* for each n_ranks group.
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*
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* ranges for parameters:
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* wr_data_delay = 0-6
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* clk adjust = 0-8
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* cpo 2-0x1E (30)
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*/
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static const struct board_specific_parameters dimm0[] = {
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/*
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* memory controller 0
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* num| hi| clk| cpo|wrdata|2T
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* ranks| mhz|adjst| | delay|
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*/
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#ifdef CONFIG_SYS_FSL_DDR2
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{2, 549, 4, 0x1f, 2, 0},
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{2, 680, 4, 0x1f, 3, 0},
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{2, 850, 4, 0x1f, 4, 0},
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{1, 549, 4, 0x1f, 2, 0},
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{1, 680, 4, 0x1f, 3, 0},
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{1, 850, 4, 0x1f, 4, 0},
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#else
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{2, 850, 6, 0x1f, 4, 0},
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{1, 850, 4, 0x1f, 4, 0},
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#endif
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{}
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};
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void fsl_ddr_board_options(memctl_options_t *popts,
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dimm_params_t *pdimm,
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unsigned int ctrl_num)
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{
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const struct board_specific_parameters *pbsp, *pbsp_highest = NULL;
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ulong ddr_freq;
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int i;
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if (ctrl_num) {
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printf("Wrong parameter for controller number %d", ctrl_num);
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return;
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}
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if (!pdimm->n_ranks)
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return;
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/*
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* set odt_rd_cfg and odt_wr_cfg. If the there is only one dimm in
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* that controller, set odt_wr_cfg to 4 for CS0, and 0 to CS1. If
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* there are two dimms in the controller, set odt_rd_cfg to 3 and
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* odt_wr_cfg to 3 for the even CS, 0 for the odd CS.
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*/
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for (i = 0; i < CONFIG_CHIP_SELECTS_PER_CTRL; i++) {
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popts->cs_local_opts[i].odt_rd_cfg = 0;
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popts->cs_local_opts[i].odt_wr_cfg = 1;
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}
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pbsp = dimm0;
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/* Get clk_adjust, cpo, write_data_delay,2T, according to the board ddr
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* freqency and n_banks specified in board_specific_parameters table.
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*/
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ddr_freq = get_ddr_freq(0) / 1000000;
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while (pbsp->datarate_mhz_high) {
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if (pbsp->n_ranks == pdimm->n_ranks) {
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if (ddr_freq <= pbsp->datarate_mhz_high) {
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popts->clk_adjust = pbsp->clk_adjust;
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popts->cpo_override = pbsp->cpo;
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popts->write_data_delay =
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pbsp->write_data_delay;
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popts->twot_en = pbsp->force_2t;
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goto found;
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}
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pbsp_highest = pbsp;
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}
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pbsp++;
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}
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if (pbsp_highest) {
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printf("Error: board specific timing not found "
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"for data rate %lu MT/s!\n"
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"Trying to use the highest speed (%u) parameters\n",
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ddr_freq, pbsp_highest->datarate_mhz_high);
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popts->clk_adjust = pbsp_highest->clk_adjust;
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popts->cpo_override = pbsp_highest->cpo;
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popts->write_data_delay = pbsp_highest->write_data_delay;
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popts->twot_en = pbsp_highest->force_2t;
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} else {
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panic("DIMM is not supported by this board");
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}
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found:
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/*
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* Factors to consider for half-strength driver enable:
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* - number of DIMMs installed
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*/
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popts->half_strength_driver_enable = 0;
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popts->wrlvl_en = 1;
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/* Write leveling override */
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popts->wrlvl_override = 1;
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popts->wrlvl_sample = 0xa;
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popts->wrlvl_start = 0x8;
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/* Rtt and Rtt_WR override */
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popts->rtt_override = 1;
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popts->rtt_override_value = DDR3_RTT_120_OHM;
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popts->rtt_wr_override_value = 0; /* Rtt_WR= dynamic ODT off */
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}
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