src/northbridge/amd/amdmct/mct_ddr3/modtrd.c

   1 /*
   2  * This file is part of the coreboot project.
   3  *
   4  * Copyright (C) 2010 Advanced Micro Devices, 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  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  18  */
  19
  20 static u32 mct_MR1Odt_RDimm(struct MCTStatStruc *pMCTstat,
  21                                 struct DCTStatStruc *pDCTstat, u8 dct, u32 MrsChipSel)
  22 {
  23         u8 Speed = pDCTstat->Speed;
  24         u32 ret;
  25         u8 DimmsInstalled, DimmNum, ChipSelect;
  26
  27         ChipSelect = (MrsChipSel >> 20) & 0xF;
  28         DimmNum = ChipSelect & 0xFE;
  29         DimmsInstalled = pDCTstat->MAdimms[dct];
  30         if (dct == 1)
  31                 DimmNum ++;
  32         ret = 0;
  33
  34         if (mctGet_NVbits(NV_MAX_DIMMS) == 4) {
  35                 if (DimmsInstalled == 1)
  36                         ret |= 1 << 2;
  37                 else {
  38                         if (pDCTstat->CSPresent & 0xF0) {
  39                                 if (pDCTstat->DimmQRPresent & (1 << DimmNum)) {
  40                                         if (!(ChipSelect & 1))
  41                                                 ret |= 1 << 2;
  42                                 } else
  43                                         ret |= 0x204;
  44                         } else {
  45                                 if (Speed < 6)
  46                                         ret |= 0x44;
  47                                 else
  48                                         ret |= 0x204;
  49                         }
  50                 }
  51         } else if (DimmsInstalled == 1)
  52                 ret |= 1 << 2;
  53         else if (Speed < 6)
  54                 ret |= 0x44;
  55         else
  56                 ret |= 0x204;
  57
  58         //ret = 0;
  59         return ret;
  60 }
  61
  62 static u32 mct_DramTermDyn_RDimm(struct MCTStatStruc *pMCTstat,
  63                                 struct DCTStatStruc *pDCTstat, u8 dimm)
  64 {
  65         u8 DimmsInstalled = dimm;
  66         u32 DramTermDyn = 0;
  67         u8 Speed = pDCTstat->Speed;
  68
  69         if (mctGet_NVbits(NV_MAX_DIMMS) == 4) {
  70                 if (pDCTstat->CSPresent & 0xF0) {
  71                         if (DimmsInstalled == 1)
  72                                 if (Speed == 7)
  73                                         DramTermDyn |= 1 << 10;
  74                                 else
  75                                         DramTermDyn |= 1 << 11;
  76                         else
  77                                 if (Speed == 4)
  78                                         DramTermDyn |= 1 << 11;
  79                                 else
  80                                         DramTermDyn |= 1 << 10;
  81                 } else {
  82                         if (DimmsInstalled != 1) {
  83                                 if (Speed == 7)
  84                                         DramTermDyn |= 1 << 10;
  85                                 else
  86                                         DramTermDyn |= 1 << 11;
  87                         }
  88                 }
  89         } else {
  90                 if (DimmsInstalled != 1)
  91                         DramTermDyn |= 1 << 11;
  92         }
  93         return DramTermDyn;
  94 }