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/*
* Copyright 2009 Extreme Engineering Solutions, Inc.
* Copyright 2007-2008 Freescale Semiconductor, Inc.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#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, SPD_EEPROM_OFFSET, 2, (uchar *)spd,
sizeof(ddr2_spd_eeprom_t));
}
unsigned int fsl_ddr_get_mem_data_rate(void)
{
return get_bus_freq(0);
}
void fsl_ddr_get_spd(ddr2_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) {
i2c_address = SPD_EEPROM_ADDRESS1;
#ifdef SPD_EEPROM_ADDRESS2
} else if (ctrl_num == 1) {
i2c_address = SPD_EEPROM_ADDRESS2;
#endif
} else {
/* An inalid ctrl number was give, use default SPD */
printf("ERROR: invalid DDR ctrl: %d\n", ctrl_num);
i2c_address = SPD_EEPROM_ADDRESS1;
}
get_spd(&(ctrl_dimms_spd[i]), i2c_address);
}
}
/*
* There are four board-specific SDRAM timing parameters which must be
* calculated based on the particular PCB artwork. These are:
* 1.) CPO (Read Capture Delay)
* - TIMING_CFG_2 register
* Source: Calculation based on board trace lengths and
* chip-specific internal delays.
* 2.) WR_DATA_DELAY (Write Command to Data Strobe Delay)
* - TIMING_CFG_2 register
* Source: Calculation based on board trace lengths.
* Unless clock and DQ lanes are very different
* lengths (>2"), this should be set to the nominal value
* of 1/2 clock delay.
* 3.) CLK_ADJUST (Clock and Addr/Cmd alignment control)
* - DDR_SDRAM_CLK_CNTL register
* Source: Signal Integrity Simulations
* 4.) 2T Timing on Addr/Ctl
* - TIMING_CFG_2 register
* Source: Signal Integrity Simulations
* Usually only needed with heavy load/very high speed (>DDR2-800)
*
* PCB routing on the XPedite5170 is nearly identical to the XPedite5370
* so we use the XPedite5370 settings as a basis for the XPedite5170.
*/
typedef struct board_memctl_options {
uint16_t datarate_mhz_low;
uint16_t datarate_mhz_high;
uint8_t clk_adjust;
uint8_t cpo_override;
uint8_t write_data_delay;
} board_memctl_options_t;
static struct board_memctl_options bopts_ctrl[][2] = {
{
/* Controller 0 */
{
/* DDR2 600/667 */
.datarate_mhz_low = 500,
.datarate_mhz_high = 750,
.clk_adjust = 5,
.cpo_override = 8,
.write_data_delay = 2,
},
{
/* DDR2 800 */
.datarate_mhz_low = 750,
.datarate_mhz_high = 850,
.clk_adjust = 5,
.cpo_override = 9,
.write_data_delay = 2,
},
},
{
/* Controller 1 */
{
/* DDR2 600/667 */
.datarate_mhz_low = 500,
.datarate_mhz_high = 750,
.clk_adjust = 5,
.cpo_override = 7,
.write_data_delay = 2,
},
{
/* DDR2 800 */
.datarate_mhz_low = 750,
.datarate_mhz_high = 850,
.clk_adjust = 5,
.cpo_override = 8,
.write_data_delay = 2,
},
},
};
void fsl_ddr_board_options(memctl_options_t *popts,
dimm_params_t *pdimm,
unsigned int ctrl_num)
{
struct board_memctl_options *bopts = bopts_ctrl[ctrl_num];
sys_info_t sysinfo;
int i;
unsigned int datarate;
get_sys_info(&sysinfo);
datarate = fsl_ddr_get_mem_data_rate() / 1000000;
for (i = 0; i < ARRAY_SIZE(bopts_ctrl[ctrl_num]); i++) {
if ((bopts[i].datarate_mhz_low <= datarate) &&
(bopts[i].datarate_mhz_high >= datarate)) {
debug("controller %d:\n", ctrl_num);
debug(" clk_adjust = %d\n", bopts[i].clk_adjust);
debug(" cpo = %d\n", bopts[i].cpo_override);
debug(" write_data_delay = %d\n",
bopts[i].write_data_delay);
popts->clk_adjust = bopts[i].clk_adjust;
popts->cpo_override = bopts[i].cpo_override;
popts->write_data_delay = bopts[i].write_data_delay;
}
}
/*
* Factors to consider for half-strength driver enable:
* - number of DIMMs installed
*/
popts->half_strength_driver_enable = 0;
}
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