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* Copyright 2008 Freescale Semiconductor, Inc.
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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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#include <asm/fsl_ddr_sdram.h>
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#include <asm/fsl_ddr_dimm_params.h>
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static void get_spd(ddr2_spd_eeprom_t *spd, unsigned char i2c_address)
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i2c_read(i2c_address, 0, 1, (uchar *)spd, sizeof(ddr2_spd_eeprom_t));
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unsigned int fsl_ddr_get_mem_data_rate(void)
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return get_ddr_freq(0);
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void fsl_ddr_get_spd(ddr2_spd_eeprom_t *ctrl_dimms_spd,
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unsigned int ctrl_num)
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unsigned int i2c_address = 0;
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for (i = 0; i < CONFIG_DIMM_SLOTS_PER_CTLR; i++) {
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if (ctrl_num == 0 && i == 0) {
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i2c_address = SPD_EEPROM_ADDRESS1;
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if (ctrl_num == 1 && i == 0) {
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i2c_address = SPD_EEPROM_ADDRESS2;
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get_spd(&(ctrl_dimms_spd[i]), i2c_address);
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u32 datarate_mhz_high;
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} board_specific_parameters_t;
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/* ranges for parameters:
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/* XXX: these values need to be checked for all interleaving modes. */
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/* XXX: No reliable dual-rank 800 MHz setting has been found. It may
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* seem reliable, but errors will appear when memory intensive
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/* XXX: Single rank at 800 MHz is OK. */
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const board_specific_parameters_t board_specific_parameters[][20] = {
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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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{ 0, 333, 2, 6, 7, 3, 0},
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{334, 400, 2, 6, 9, 3, 0},
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{401, 549, 2, 6, 11, 3, 0},
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{550, 680, 2, 1, 10, 5, 0},
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{681, 850, 2, 1, 12, 5, 1},
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{ 0, 333, 1, 6, 7, 3, 0},
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{334, 400, 1, 6, 9, 3, 0},
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{401, 549, 1, 6, 11, 3, 0},
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{550, 680, 1, 1, 10, 5, 0},
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{681, 850, 1, 1, 12, 5, 0}
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/* memory controller 1 */
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/* lo| hi| num| clk| cpo|wrdata|2T */
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/* mhz| mhz|ranks|adjst| | delay| */
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{ 0, 333, 2, 6, 7, 3, 0},
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{334, 400, 2, 6, 9, 3, 0},
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{401, 549, 2, 6, 11, 3, 0},
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{550, 680, 2, 1, 11, 6, 0},
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{681, 850, 2, 1, 13, 6, 1},
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{ 0, 333, 1, 6, 7, 3, 0},
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{334, 400, 1, 6, 9, 3, 0},
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{401, 549, 1, 6, 11, 3, 0},
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{550, 680, 1, 1, 11, 6, 0},
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{681, 850, 1, 1, 13, 6, 0}
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void fsl_ddr_board_options(memctl_options_t *popts,
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unsigned int ctrl_num)
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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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/* 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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for (i = 0; i < CONFIG_CHIP_SELECTS_PER_CTRL; i++) {
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if (i&1) { /* odd CS */
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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 = 0;
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} else { /* even CS */
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if (CONFIG_DIMM_SLOTS_PER_CTLR == 1) {
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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 = 4;
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} else if (CONFIG_DIMM_SLOTS_PER_CTLR == 2) {
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popts->cs_local_opts[i].odt_rd_cfg = 3;
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popts->cs_local_opts[i].odt_wr_cfg = 3;
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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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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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* Factors to consider for half-strength driver enable:
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* - number of DIMMs installed
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popts->half_strength_driver_enable = 0;