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/*
* 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(ddr2_spd_eeprom_t *spd, unsigned char i2c_address)
{
i2c_read(i2c_address, 0, 1, (uchar *)spd, sizeof(ddr2_spd_eeprom_t));
/* We use soldered memory, but use an SPD EEPROM to describe it.
* The SPD has an unspecified dimm type, but the DDR2 initialization
* code requires a specific type to be specified. This sets the type
* as a standard unregistered SO-DIMM. */
if (spd->dimm_type == 0) {
spd->dimm_type = 0x4;
((uchar *)spd)[63] += 0x4;
}
}
void fsl_ddr_get_spd(ddr2_spd_eeprom_t *ctrl_dimms_spd,
unsigned int ctrl_num)
{
unsigned int i;
if (ctrl_num) {
printf("%s: invalid ctrl_num = %d\n", __func__, ctrl_num);
return;
}
for (i = 0; i < CONFIG_DIMM_SLOTS_PER_CTLR; i++)
get_spd(&(ctrl_dimms_spd[i]), SPD_EEPROM_ADDRESS);
}
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 = 7;
/*
* Factors to consider for CPO:
* - frequency
* - ddr1 vs. ddr2
*/
popts->cpo_override = 9;
/*
* 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;
/*
* Factors to consider for half-strength driver enable:
* - number of DIMMs installed
*/
popts->half_strength_driver_enable = 0;
}
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