7 * Voltage change for DDR3 DIMMs.
9 * @xrefitem bom "File Content Label" "Release Content"
11 * @e sub-project: (Mem/Feat/LVDDR3)
12 * @e \$Revision: 44324 $ @e \$Date: 2010-12-22 02:16:51 -0700 (Wed, 22 Dec 2010) $
15 /*****************************************************************************
17 * Copyright (C) 2012 Advanced Micro Devices, Inc.
18 * All rights reserved.
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21 * modification, are permitted provided that the following conditions are met:
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23 * notice, this list of conditions and the following disclaimer.
24 * * Redistributions in binary form must reproduce the above copyright
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26 * documentation and/or other materials provided with the distribution.
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42 * ***************************************************************************
47 *----------------------------------------------------------------------------
50 *----------------------------------------------------------------------------
65 #define FILECODE PROC_MEM_FEAT_LVDDR3_MFLVDDR3_FILECODE
70 /*----------------------------------------------------------------------------
71 * DEFINITIONS AND MACROS
73 *----------------------------------------------------------------------------
76 /*----------------------------------------------------------------------------
77 * TYPEDEFS AND STRUCTURES
79 *----------------------------------------------------------------------------
82 /*----------------------------------------------------------------------------
83 * PROTOTYPES OF LOCAL FUNCTIONS
85 *----------------------------------------------------------------------------
88 /*----------------------------------------------------------------------------
91 *----------------------------------------------------------------------------
94 /*-----------------------------------------------------------------------------*/
97 * This function calculate the common lowest voltage supported by all DDR3
98 * DIMMs in the system. This function only needs to be called on BSP.
100 * @param[in, out] *NBPtr - Pointer to NB block
102 * @return TRUE - This feature is enabled.
103 * @return FALSE - This feature is not enabled.
108 IN OUT MEM_NB_BLOCK *NBPtr
111 CH_DEF_STRUCT *ChannelPtr;
112 MEM_TECH_BLOCK *TechPtr;
113 MEM_SHARED_DATA *mmSharedPtr;
121 mmSharedPtr = NBPtr->SharedPtr;
122 TechPtr = NBPtr->TechPtr;
125 for (Dct = 0; Dct < NBPtr->DctCount; Dct++) {
126 NBPtr->SwitchDCT (NBPtr, Dct);
127 for (Channel = 0; Channel < NBPtr->ChannelCount; Channel++) {
128 NBPtr->SwitchChannel (NBPtr, Channel);
129 ChannelPtr = NBPtr->ChannelPtr;
130 for (Dimm = 0; Dimm < MAX_DIMMS_PER_CHANNEL; Dimm++) {
131 if (TechPtr->GetDimmSpdBuffer (TechPtr, &SpdBufferPtr, Dimm)) {
132 // SPD byte 6: Module Nominal Voltage, VDD
136 VDDByte = SpdBufferPtr[MNVVDD];
137 IDS_HDT_CONSOLE (MEM_FLOW, "Node%d DCT%d Channel%d Dimm%d VDD Byte: 0x%02x\n", NBPtr->Node, Dct, Channel, Dimm, VDDByte);
139 // Reverse the 1.5V operable bit. So its encoding can be consistent
140 // with that of 1.35V and 1.25V operable bit.
142 ASSERT (VDDByte != 0);
144 if (mmSharedPtr->VoltageMap != 0) {
145 // Get the common supported voltage map
146 VoltageMap &= VDDByte;
148 // This is the second execution of all the loop as no common voltage is found
149 if (VDDByte == (1 << VOLT1_5_ENCODED_VAL)) {
150 // Always exclude 1.5V dimm if no common voltage is found
151 ChannelPtr->DimmExclude |= (UINT16) 1 << Dimm;
156 if (mmSharedPtr->VoltageMap == 0) {
157 NBPtr->DCTPtr->Timings.DimmExclude |= ChannelPtr->DimmExclude;
162 if (mmSharedPtr->VoltageMap != 0) {
163 mmSharedPtr->VoltageMap &= VoltageMap;
169 /*----------------------------------------------------------------------------
172 *----------------------------------------------------------------------------