mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-30 22:08:52 +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>
67 lines
1.4 KiB
C
67 lines
1.4 KiB
C
/*
|
|
* Copyright 2009 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 <fsl_ddr_sdram.h>
|
|
#include <fsl_ddr_dimm_params.h>
|
|
|
|
void fsl_ddr_board_options(memctl_options_t *popts,
|
|
dimm_params_t *pdimm,
|
|
unsigned int ctrl_num)
|
|
{
|
|
/*
|
|
* Factors to consider for clock adjust:
|
|
* - number of chips on bus
|
|
* - position of slot
|
|
* - DDR1 vs. DDR2?
|
|
* - ???
|
|
*
|
|
* This needs to be determined on a board-by-board basis.
|
|
* 0110 3/4 cycle late
|
|
* 0111 7/8 cycle late
|
|
*/
|
|
popts->clk_adjust = 4;
|
|
|
|
/*
|
|
* Factors to consider for CPO:
|
|
* - frequency
|
|
* - ddr1 vs. ddr2
|
|
*/
|
|
popts->cpo_override = 0xff;
|
|
|
|
/*
|
|
* 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 = 2;
|
|
|
|
/*
|
|
* Enable half drive strength
|
|
*/
|
|
popts->half_strength_driver_enable = 1;
|
|
|
|
/* Write leveling override */
|
|
popts->wrlvl_en = 1;
|
|
popts->wrlvl_override = 1;
|
|
popts->wrlvl_sample = 0xa;
|
|
popts->wrlvl_start = 0x4;
|
|
|
|
/* Rtt and Rtt_W override */
|
|
popts->rtt_override = 1;
|
|
popts->rtt_override_value = DDR3_RTT_60_OHM;
|
|
popts->rtt_wr_override_value = 0; /* Rtt_WR= dynamic ODT off */
|
|
}
|