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/*
* Copyright 2008,2011 Freescale Semiconductor, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* Version 2 as published by the Free Software Foundation.
*/
#include <common.h>
#include <asm/fsl_ddr_sdram.h>
#include <asm/fsl_ddr_dimm_params.h>
struct board_specific_parameters {
u32 n_ranks;
u32 datarate_mhz_high;
u32 clk_adjust;
u32 cpo;
u32 write_data_delay;
};
/*
* This table contains all valid speeds we want to override with board
* specific parameters. datarate_mhz_high values need to be in ascending order
* for each n_ranks group.
*/
const struct board_specific_parameters dimm0[] = {
/*
* memory controller 0
* num| hi| clk| cpo|wrdata|2T
* ranks| mhz|adjst| | delay|
*/
{4, 333, 7, 7, 3},
{4, 549, 7, 9, 3},
{4, 650, 7, 10, 4},
{2, 333, 7, 7, 3},
{2, 549, 7, 9, 3},
{2, 650, 7, 10, 4},
{1, 333, 7, 7, 3},
{1, 549, 7, 9, 3},
{1, 650, 7, 10, 4},
{}
};
/*
* The two slots have slightly different timing. The center values are good
* for both slots. We use identical speed tables for them. In future use, if
* DIMMs have fewer center values that require two separated tables, copy the
* udimm0 table to udimm1 and make changes to clk_adjust and wrlvl_start.
*/
const struct board_specific_parameters *dimms[] = {
dimm0,
dimm0,
};
void fsl_ddr_board_options(memctl_options_t *popts,
dimm_params_t *pdimm,
unsigned int ctrl_num)
{
const struct board_specific_parameters *pbsp, *pbsp_highest = NULL;
unsigned int i;
ulong ddr_freq;
if (ctrl_num > 1) {
printf("Wrong parameter for controller number %d", ctrl_num);
return;
}
for (i = 0; i < CONFIG_DIMM_SLOTS_PER_CTLR; i++) {
if (pdimm[i].n_ranks)
break;
}
if (i >= CONFIG_DIMM_SLOTS_PER_CTLR) /* no DIMM */
return;
pbsp = dimms[ctrl_num];
/* Get clk_adjust, cpo, write_data_delay, according to the board ddr
* freqency and n_banks specified in board_specific_parameters table.
*/
ddr_freq = get_ddr_freq(0) / 1000000;
while (pbsp->datarate_mhz_high) {
if (pbsp->n_ranks == pdimm[i].n_ranks) {
if (ddr_freq <= pbsp->datarate_mhz_high) {
popts->clk_adjust = pbsp->clk_adjust;
popts->cpo_override = pbsp->cpo;
popts->write_data_delay =
pbsp->write_data_delay;
goto found;
}
pbsp_highest = pbsp;
}
pbsp++;
}
if (pbsp_highest) {
printf("Error: board specific timing not found "
"for data rate %lu MT/s!\n"
"Trying to use the highest speed (%u) parameters\n",
ddr_freq, pbsp_highest->datarate_mhz_high);
popts->clk_adjust = pbsp_highest->clk_adjust;
popts->cpo_override = pbsp_highest->cpo;
popts->write_data_delay = pbsp_highest->write_data_delay;
} else {
panic("DIMM is not supported by this board");
}
found:
/* 2T timing enable */
popts->twot_en = 1;
}
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