LXR uboot/board/pm856/ddr.c

   1/*
   2 * Copyright 2008 Freescale Semiconductor, Inc.
   3 *
   4 * This program is free software; you can redistribute it and/or
   5 * modify it under the terms of the GNU General Public License
   6 * Version 2 as published by the Free Software Foundation.
   7 */
   8
   9#include <common.h>
  10#include <i2c.h>
  11
  12#include <asm/fsl_ddr_sdram.h>
  13#include <asm/fsl_ddr_dimm_params.h>
  14
  15static void
  16get_spd(ddr1_spd_eeprom_t *spd, unsigned char i2c_address)
  17{
  18        i2c_read(i2c_address, 0, 1, (uchar *)spd, sizeof(ddr1_spd_eeprom_t));
  19}
  20
  21
  22unsigned int
  23fsl_ddr_get_mem_data_rate(void)
  24{
  25        return get_ddr_freq(0);
  26}
  27
  28
  29void
  30fsl_ddr_get_spd(ddr1_spd_eeprom_t *ctrl_dimms_spd,
  31                      unsigned int ctrl_num)
  32{
  33        unsigned int i;
  34        unsigned int i2c_address = 0;
  35
  36        for (i = 0; i < CONFIG_DIMM_SLOTS_PER_CTLR; i++) {
  37                if (ctrl_num == 0 && i == 0) {
  38                        i2c_address = SPD_EEPROM_ADDRESS;
  39                }
  40                get_spd(&(ctrl_dimms_spd[i]), i2c_address);
  41        }
  42}
  43
  44void fsl_ddr_board_options(memctl_options_t *popts,
  45                                dimm_params_t *pdimm,
  46                                unsigned int ctrl_num)
  47{
  48        /*
  49         * Factors to consider for CPO:
  50         *      - frequency
  51         *      - ddr1 vs. ddr2
  52         */
  53        popts->cpo_override = 0;
  54
  55        /*
  56         * Factors to consider for write data delay:
  57         *      - number of DIMMs
  58         *
  59         * 1 = 1/4 clock delay
  60         * 2 = 1/2 clock delay
  61         * 3 = 3/4 clock delay
  62         * 4 = 1   clock delay
  63         * 5 = 5/4 clock delay
  64         * 6 = 3/2 clock delay
  65         */
  66        popts->write_data_delay = 3;
  67
  68        /*
  69         * Factors to consider for half-strength driver enable:
  70         *      - number of DIMMs installed
  71         */
  72        popts->half_strength_driver_enable = 0;
  73}
  74