mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-22 01:48:52 +09:00
![York Sun](/assets/img/avatar_default.png)
Freescale DDR driver has been used for mpc83xx, mpc85xx, mpc86xx SoCs. The similar DDR controllers will be used for ARM-based SoCs. Signed-off-by: York Sun <yorksun@freescale.com>
102 lines
2.5 KiB
C
102 lines
2.5 KiB
C
/*
|
|
* Copyright 2011 Freescale Semiconductor, Inc.
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <common.h>
|
|
|
|
#include <fsl_ddr_sdram.h>
|
|
#include <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;
|
|
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.
|
|
*/
|
|
static const struct board_specific_parameters udimm0[] = {
|
|
/*
|
|
* memory controller 0
|
|
* num| hi| clk| cpo|wrdata|2T
|
|
* ranks| mhz|adjst| | delay|
|
|
*/
|
|
{2, 300, 4, 4, 2, 0},
|
|
{2, 365, 4, 6, 2, 0},
|
|
{2, 450, 4, 7, 2, 0},
|
|
{2, 850, 4, 31, 2, 0},
|
|
{1, 300, 4, 4, 2, 0},
|
|
{1, 365, 4, 6, 2, 0},
|
|
{1, 450, 4, 7, 2, 0},
|
|
{1, 850, 4, 31, 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;
|
|
unsigned int i;
|
|
ulong ddr_freq;
|
|
|
|
if (ctrl_num != 0) /* we have only one controller */
|
|
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 = udimm0;
|
|
|
|
/* 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[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;
|
|
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->clk_adjust = pbsp_highest->clk_adjust;
|
|
popts->cpo_override = pbsp_highest->cpo;
|
|
popts->write_data_delay = pbsp_highest->write_data_delay;
|
|
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;
|
|
popts->dqs_config = 0; /* only true DQS signal is used on board */
|
|
}
|