src/northbridge/via/vx800/dqs_search.c

   1 /*
   2  * This file is part of the coreboot project.
   3  *
   4  * Copyright (C) 2009 One Laptop per Child, Association, Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; version 2 of the License.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15
  16 void SetDQSOutputCHA(DRAM_SYS_ATTR * DramAttr);
  17 void SetDQSOutputCHB(DRAM_SYS_ATTR * DramAttr);
  18
  19 /*===================================================================
  20 Function   : DRAMDQSOutputSearchCHA()
  21 Precondition :
  22 Input      :
  23                    DramAttr:  pointer point to  DRAM_SYS_ATTR  which consist the DDR and Dimm information
  24                                     in MotherBoard
  25 Output     : Void
  26 Purpose   : set DQS output delay register reg70  and DQ output delay register reg71
  27 ===================================================================*/
  28
  29 #define CH_A      0
  30 #define CH_B      1
  31 void DRAMDQSOutputSearch(DRAM_SYS_ATTR * DramAttr)
  32 {
  33         if (DramAttr->RankNumChA > 0)
  34                 SetDQSOutputCHA(DramAttr);
  35 }
  36
  37 /*===================================================================
  38 Function   : SetDQSOutputCHA()
  39 Precondition :
  40 Input      :
  41                    DramAttr:  pointer point to  DRAM_SYS_ATTR  which consist the DDR and Dimm information
  42                                     in MotherBoard
  43 Output     : Void
  44 Purpose   :  according the frequence set CHA DQS output
  45 ===================================================================*/
  46 void SetDQSOutputCHA(DRAM_SYS_ATTR * DramAttr)
  47 {
  48         u8 Reg70, Reg71;
  49         u8 Index;
  50
  51         if (DramAttr->DramFreq == DIMMFREQ_400)
  52                 Index = 3;
  53         else if (DramAttr->DramFreq == DIMMFREQ_533)
  54                 Index = 2;
  55         else if (DramAttr->DramFreq == DIMMFREQ_667)
  56                 Index = 1;
  57         else if (DramAttr->DramFreq == DIMMFREQ_800)
  58                 Index = 0;
  59         else
  60                 Index = 3;
  61
  62         if (DramAttr->RankNumChA > 2) {
  63                 Reg70 = Fixed_DQSA_3_4_Rank_Table[Index][0];
  64                 Reg71 = Fixed_DQSA_3_4_Rank_Table[Index][1];
  65         } else {
  66                 Reg70 = Fixed_DQSA_1_2_Rank_Table[Index][0];
  67                 Reg71 = Fixed_DQSA_1_2_Rank_Table[Index][1];
  68         }
  69         pci_write_config8(MEMCTRL, 0x70, Reg70);
  70         pci_write_config8(MEMCTRL, 0x71, Reg71);
  71 }
  72
  73 //################
  74 //     STEP 12   #
  75 //################
  76
  77 /*===================================================================
  78 Function   : DRAMDQSInputSearch()
  79 Precondition :
  80 Input      :
  81                    DramAttr:  pointer point to  DRAM_SYS_ATTR  which consist the DDR and Dimm information
  82                                     in MotherBoard
  83 Output     : Void
  84 Purpose   : search DQS input delay for CHA/CHB
  85 ===================================================================*/
  86
  87 void DRAMDQSInputSearch(DRAM_SYS_ATTR * DramAttr)
  88 {
  89         u8 Data;
  90         //auto mode
  91         Data = 0x0;
  92         pci_write_config8(MEMCTRL, 0x77, Data);
  93 }