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c39f44dc6f
Move fsl_ddr_get_spd into common mpc8xxx/ddr/main.c as most boards pretty much do the same thing. The only variations are in how many controllers or DIMMs per controller exist. To make this work we standardize on the names of the SPD_EEPROM_ADDRESS defines based on the use case of the board. We allow boards to override get_spd to either do board specific fixups to the SPD data or deal with any unique behavior of how the SPD eeproms are wired up. Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
104 lines
3 KiB
C
104 lines
3 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 <asm/fsl_ddr_sdram.h>
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#include <asm/fsl_ddr_dimm_params.h>
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typedef struct {
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u32 datarate_mhz_low;
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u32 datarate_mhz_high;
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u32 n_ranks;
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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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} board_specific_parameters_t;
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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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const board_specific_parameters_t board_specific_parameters[][20] = {
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{
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/* memory controller 0 */
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/* lo| hi| num| clk| cpo|wrdata|2T */
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/* mhz| mhz|ranks|adjst| | delay| */
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#ifdef CONFIG_FSL_DDR2
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{ 0, 333, 2, 4, 0x1f, 2, 0},
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{334, 400, 2, 4, 0x1f, 2, 0},
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{401, 549, 2, 4, 0x1f, 2, 0},
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{550, 680, 2, 4, 0x1f, 3, 0},
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{681, 850, 2, 4, 0x1f, 4, 0},
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{ 0, 333, 1, 4, 0x1f, 2, 0},
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{334, 400, 1, 4, 0x1f, 2, 0},
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{401, 549, 1, 4, 0x1f, 2, 0},
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{550, 680, 1, 4, 0x1f, 3, 0},
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{681, 850, 1, 4, 0x1f, 4, 0}
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#else
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{ 0, 850, 2, 6, 0x1f, 4, 0},
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{ 0, 850, 1, 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 board_specific_parameters_t *pbsp =
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&(board_specific_parameters[ctrl_num][0]);
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u32 num_params = sizeof(board_specific_parameters[ctrl_num]) /
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sizeof(board_specific_parameters[0][0]);
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u32 i;
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ulong ddr_freq;
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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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/* 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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for (i = 0; i < num_params; i++) {
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if (ddr_freq >= pbsp->datarate_mhz_low &&
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ddr_freq <= pbsp->datarate_mhz_high &&
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pdimm->n_ranks == pbsp->n_ranks) {
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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 = pbsp->write_data_delay;
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popts->twoT_en = pbsp->force_2T;
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}
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pbsp++;
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}
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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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