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/*
* Copyright 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 <i2c.h>
#include <hwconfig.h>
#include <asm/mmu.h>
#include <asm/fsl_ddr_sdram.h>
#include <asm/fsl_ddr_dimm_params.h>
#include <asm/fsl_law.h>
struct board_specific_parameters {
u32 n_ranks;
u32 datarate_mhz_high;
u32 clk_adjust;
u32 wrlvl_start;
u32 cpo;
u32 write_data_delay;
u32 force_2t;
};
/*
* 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.
*
* ranges for parameters:
* wr_data_delay = 0-6
* clk adjust = 0-8
* cpo 2-0x1E (30)
*/
static const struct board_specific_parameters dimm0[] = {
/*
* memory controller 0
* num| hi| clk| wrlvl | cpo |wrdata|2T
* ranks| mhz|adjst| start | delay|
*/
{2, 750, 3, 5, 0xff, 2, 0},
{2, 1250, 4, 6, 0xff, 2, 0},
{2, 1350, 5, 7, 0xff, 2, 0},
{2, 1666, 5, 8, 0xff, 2, 0},
{}
};
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;
ulong ddr_freq;
if (ctrl_num) {
printf("Wrong parameter for controller number %d", ctrl_num);
return;
}
if (!pdimm->n_ranks)
return;
pbsp = dimm0;
/*
* Get clk_adjust, cpo, write_data_delay,2T, 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->n_ranks) {
if (ddr_freq <= pbsp->datarate_mhz_high) {
popts->cpo_override = pbsp->cpo;
popts->write_data_delay =
pbsp->write_data_delay;
popts->clk_adjust = pbsp->clk_adjust;
popts->wrlvl_start = pbsp->wrlvl_start;
popts->twot_en = pbsp->force_2t;
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->cpo_override = pbsp_highest->cpo;
popts->write_data_delay = pbsp_highest->write_data_delay;
popts->clk_adjust = pbsp_highest->clk_adjust;
popts->wrlvl_start = pbsp_highest->wrlvl_start;
popts->twot_en = pbsp_highest->force_2t;
} else {
panic("DIMM is not supported by this board");
}
found:
/*
* Factors to consider for half-strength driver enable:
* - number of DIMMs installed
*/
popts->half_strength_driver_enable = 0;
/* Write leveling override */
popts->wrlvl_override = 1;
popts->wrlvl_sample = 0xf;
/* Rtt and Rtt_WR override */
popts->rtt_override = 0;
/* Enable ZQ calibration */
popts->zq_en = 1;
/* DHC_EN =1, ODT = 60 Ohm */
popts->ddr_cdr1 = DDR_CDR1_DHC_EN;
}
phys_size_t initdram(int board_type)
{
phys_size_t dram_size = 0;
puts("Initializing....");
if (fsl_use_spd()) {
puts("using SPD\n");
dram_size = fsl_ddr_sdram();
} else {
puts("no SPD and fixed parameters\n");
return dram_size;
}
dram_size = setup_ddr_tlbs(dram_size / 0x100000);
dram_size *= 0x100000;
debug(" DDR: ");
return dram_size;
}
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