mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-05 20:54:31 +00:00
b4983e16d1
For light loaded system, we use the 1T timing to gain better memory performance, but for some heavily loaded system, you have to add the 2T timing options to board files. Signed-off-by: Dave Liu <daveliu@freescale.com> Acked-by: Andy Fleming <afleming@freescale.com>
76 lines
1.5 KiB
C
76 lines
1.5 KiB
C
/*
|
|
* Copyright 2008 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 <asm/fsl_ddr_sdram.h>
|
|
#include <asm/fsl_ddr_dimm_params.h>
|
|
|
|
static void
|
|
get_spd(ddr1_spd_eeprom_t *spd, unsigned char i2c_address)
|
|
{
|
|
i2c_read(i2c_address, 0, 1, (uchar *)spd, sizeof(ddr1_spd_eeprom_t));
|
|
}
|
|
|
|
|
|
unsigned int
|
|
fsl_ddr_get_mem_data_rate(void)
|
|
{
|
|
return get_ddr_freq(0);
|
|
}
|
|
|
|
|
|
void
|
|
fsl_ddr_get_spd(ddr1_spd_eeprom_t *ctrl_dimms_spd,
|
|
unsigned int ctrl_num)
|
|
{
|
|
unsigned int i;
|
|
unsigned int i2c_address = 0;
|
|
|
|
for (i = 0; i < CONFIG_DIMM_SLOTS_PER_CTLR; i++) {
|
|
if (ctrl_num == 0 && i == 0) {
|
|
i2c_address = SPD_EEPROM_ADDRESS;
|
|
}
|
|
get_spd(&(ctrl_dimms_spd[i]), i2c_address);
|
|
}
|
|
}
|
|
|
|
void fsl_ddr_board_options(memctl_options_t *popts,
|
|
dimm_params_t *pdimm,
|
|
unsigned int ctrl_num)
|
|
{
|
|
/*
|
|
* Factors to consider for CPO:
|
|
* - frequency
|
|
* - ddr1 vs. ddr2
|
|
*/
|
|
popts->cpo_override = 0;
|
|
|
|
/*
|
|
* Factors to consider for write data delay:
|
|
* - number of DIMMs
|
|
*
|
|
* 1 = 1/4 clock delay
|
|
* 2 = 1/2 clock delay
|
|
* 3 = 3/4 clock delay
|
|
* 4 = 1 clock delay
|
|
* 5 = 5/4 clock delay
|
|
* 6 = 3/2 clock delay
|
|
*/
|
|
popts->write_data_delay = 3;
|
|
|
|
/* 2T timing enable */
|
|
popts->twoT_en = 1;
|
|
|
|
/*
|
|
* Factors to consider for half-strength driver enable:
|
|
* - number of DIMMs installed
|
|
*/
|
|
popts->half_strength_driver_enable = 0;
|
|
}
|