board/gdsys/p1022/ddr.c

   1 /*
   2  * Copyright 2010 Freescale Semiconductor, Inc.
   3  * Authors: Srikanth Srinivasan <srikanth.srinivasan@freescale.com>
   4  *          Timur Tabi <timur@freescale.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the Free
   8  * Software Foundation; either version 2 of the License, or (at your option)
   9  * any later version.
  10  */
  11
  12 #include <common.h>
  13 #include <i2c.h>
  14
  15 #include <fsl_ddr_sdram.h>
  16 #include <fsl_ddr_dimm_params.h>
  17
  18 void fsl_ddr_board_options(memctl_options_t *popts, dimm_params_t *pdimm,
  19                            unsigned int ctrl_num)
  20 {
  21         unsigned int i;
  22
  23         if (ctrl_num) {
  24                 printf("Wrong parameter for controller number %d", ctrl_num);
  25                 return;
  26         }
  27         if (!pdimm->n_ranks)
  28                 return;
  29
  30         /* set odt_rd_cfg and odt_wr_cfg. */
  31         for (i = 0; i < CONFIG_CHIP_SELECTS_PER_CTRL; i++) {
  32                 popts->cs_local_opts[i].odt_rd_cfg = 0;
  33                 popts->cs_local_opts[i].odt_wr_cfg = 1;
  34         }
  35
  36         popts->clk_adjust = 5;
  37         popts->cpo_override = 0x1f;
  38         popts->write_data_delay = 2;
  39         popts->half_strength_driver_enable = 1;
  40
  41         /* Per AN4039, enable ZQ calibration. */
  42         popts->zq_en = 1;
  43 }
  44
  45 #ifdef CONFIG_SPD_EEPROM
  46 /*
  47  * we only have a "fake" SPD-EEPROM here, which has 16 bit addresses
  48  */
  49 void get_spd(generic_spd_eeprom_t *spd, u8 i2c_address)
  50 {
  51         int ret = i2c_read(i2c_address, 0, 2, (uchar *)spd,
  52                                 sizeof(generic_spd_eeprom_t));
  53
  54         if (ret) {
  55                 if (i2c_address ==
  56 #ifdef SPD_EEPROM_ADDRESS
  57                                 SPD_EEPROM_ADDRESS
  58 #elif defined(SPD_EEPROM_ADDRESS1)
  59                                 SPD_EEPROM_ADDRESS1
  60 #endif
  61                                 ) {
  62                         printf("DDR: failed to read SPD from address %u\n",
  63                                i2c_address);
  64                 } else {
  65                         debug("DDR: failed to read SPD from address %u\n",
  66                               i2c_address);
  67                 }
  68                 memset(spd, 0, sizeof(generic_spd_eeprom_t));
  69         }
  70 }
  71 #endif