[coreboot] [patch] AMD MCT DDR3 for register DIMMs

[Bao, Zheng]

The code is tested on my board with register DIMMs. More tests need to
be
done. Please send the testing report.

Note: The pDCTstat->PresetmaxFreq in mctGet_MaxLoadFreq() should be set
to a higher limit, otherwise the frequnce will be set as 400MHz.

Signed-off-by: Zheng Bao <zheng.bao at amd.com>

Index: src/northbridge/amd/amdmct/mct_ddr3/mhwlc_d.c
===================================================================
--- src/northbridge/amd/amdmct/mct_ddr3/mhwlc_d.c	(revision 6244)
+++ src/northbridge/amd/amdmct/mct_ddr3/mhwlc_d.c	(working copy)
@@ -86,7 +86,7 @@
 	procConifg(pMCTData,pDCTData, dimm, pass);
 	/* 5. Begin write levelization training:
 	 *  Program F2x[1, 0]9C_x08[WrtLevelTrEn]=1. */
-	if (pDCTData->LogicalCPUID & AMD_DR_Cx)
+	if (pDCTData->LogicalCPUID & (AMD_DR_Cx | AMD_DR_Dx))
 		set_DCT_ADDR_Bits(pDCTData, pDCTData->DctTrain,
pDCTData->NodeId, FUN_DCT,
 				DRAM_ADD_DCT_PHY_CONTROL_REG, WrtLvTrEn,
WrtLvTrEn, 1);
 	else
@@ -656,9 +656,9 @@
 	programODT(pMCTData, pDCTData, dimm);
 
 	/* Program F2x[1,0]9C_x08[WrLvOdtEn]=1 */
-	if (pDCTData->LogicalCPUID & AMD_DR_Cx)
+	if (pDCTData->LogicalCPUID & (AMD_DR_Cx | AMD_DR_Dx))
 		set_DCT_ADDR_Bits(pDCTData, pDCTData->DctTrain,
pDCTData->NodeId, FUN_DCT,
-				DRAM_ADD_DCT_PHY_CONTROL_REG, WrLvOdtEn,
WrLvOdtEn,(u32) 1);
+				DRAM_ADD_DCT_PHY_CONTROL_REG, WrLvOdtEn,
WrLvOdtEn, (u32)1);
 	else
 	{
 		/* Program WrLvOdtEn=1 through set bit 12 of D3CSODT reg
offset 0 for Rev.B*/
@@ -722,7 +722,36 @@
 
pDCTData->WLFineDelay[MAX_BYTE_LANES*dimm+ByteLane] = Seed_Fine;
 			ByteLane++;
 		}
+	} else if (pDCTData->Status[DCT_STATUS_REGISTERED]) {
/* For Pass 2 */
+		/* From BKDG, Write Leveling Seed Value. */
+		/* TODO: The unbuffered DIMMs are unstable on the code
below. So temporarily it is
+		 * only for registered DIMMs. */
+		u32 RegisterDelay, SeedTotal;
+		u8 MemClkFreq;
+		u16 freq_tab[] = {400, 533, 667, 800};
+		while(ByteLane < MAX_BYTE_LANES)
+		{
+			MemClkFreq = get_Bits(pDCTData,
pDCTData->CurrDct, pDCTData->NodeId,
+					      FUN_DCT, DRAM_CONFIG_HIGH,
0, 2);
+			if (pDCTData->Status[DCT_STATUS_REGISTERED])
+				RegisterDelay = 0x20; /* TODO: ((RCW2 &
BIT0) == 0) ? 0x20 : 0x30; */
+			else
+				RegisterDelay = 0;
+			SeedTotal =
(pDCTData->WLFineDelay[MAX_BYTE_LANES*dimm+ByteLane] & 0x1F) |
+
pDCTData->WLGrossDelay[MAX_BYTE_LANES*dimm+ByteLane] << 5;
+			/* SeedTotalPreScaling = (the total delay value
in F2x[1, 0]9C_x[4A:30] from pass 1 of write levelization
+			   training) - RegisterDelay. */
+			/* MemClkFreq: 3: 400Mhz; 4: 533Mhz; 5: 667Mhz;
6: 800Mhz */
+			SeedTotal = (u16) (RegisterDelay + ((((u32)
SeedTotal - RegisterDelay) *
+
freq_tab[MemClkFreq-3]) / 400));
+			Seed_Gross = (SeedTotal & 0x20) != 0 ? 1 : 2;
+			Seed_Fine = SeedTotal & 0x1F;
+
pDCTData->WLGrossDelay[MAX_BYTE_LANES*dimm+ByteLane] = Seed_Gross;
+
pDCTData->WLFineDelay[MAX_BYTE_LANES*dimm+ByteLane] = Seed_Fine;
+			ByteLane ++;
+		}
 	}
+
 	setWLByteDelay(pDCTData, ByteLane, dimm, 0);
 }
 
Index: src/northbridge/amd/amdmct/mct_ddr3/mctwl.c
===================================================================
--- src/northbridge/amd/amdmct/mct_ddr3/mctwl.c	(revision 6246)
+++ src/northbridge/amd/amdmct/mct_ddr3/mctwl.c	(working copy)
@@ -342,7 +342,21 @@
 	mct_Wait(250);
 
 	if (pDCTstat->Status & (1 << SB_Registered)) {
-		/* TODO: Assuming the dct==0. The agesa here is
confusing. */
+		u8 DCT0Present, DCT1Present;
+
+		DCT0Present = pDCTstat->DIMMValidDCT[0];
+		if (pDCTstat->GangedMode)
+			DCT1Present = 0;
+		else
+			DCT1Present = pDCTstat->DIMMValidDCT[1];
+
+		if (!DCT1Present)
+			pDCTstat->CSPresent =
pDCTstat->CSPresent_DCT[0];
+		else if (pDCTstat->GangedMode) {
+			pDCTstat->CSPresent = 0;
+		} else
+			pDCTstat->CSPresent =
pDCTstat->CSPresent_DCT[1];
+
 		FreqChgCtrlWrd(pMCTstat, pDCTstat);
 	}
 }
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