108 lines
2.7 KiB
C
108 lines
2.7 KiB
C
/*
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* Copyright 2010 Freescale Semiconductor, Inc.
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* Authors: Srikanth Srinivasan <srikanth.srinivasan@freescale.com>
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* Timur Tabi <timur@freescale.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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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; /* Range: 0-8 */
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u32 cpo; /* Range: 2-31 */
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u32 write_data_delay; /* Range: 0-6 */
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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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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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{1, 549, 5, 31, 3, 0},
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{1, 850, 5, 31, 5, 0},
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{2, 549, 5, 31, 3, 0},
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{2, 850, 5, 31, 5, 0},
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{}
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};
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void fsl_ddr_board_options(memctl_options_t *popts, 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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unsigned long ddr_freq;
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unsigned 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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/* set odt_rd_cfg and odt_wr_cfg. */
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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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/*
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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->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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} 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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popts->half_strength_driver_enable = 1;
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/* Per AN4039, enable ZQ calibration. */
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popts->zq_en = 1;
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/*
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* For wake-up on ARP, we need auto self refresh enabled
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*/
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popts->auto_self_refresh_en = 1;
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popts->sr_it = 0xb;
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}
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