This patch changes the "if else" style of parameter matching to table and also changes the rdpreamble parameter, which will cause that more then one DIMM will work for 939 motherboard.

Signed-off-by: Rudolf Marek <r.marek@assembler.cz>
Acked-by: Jordan Crouse <jordan.crouse@amd.com>



git-svn-id: svn://svn.coreboot.org/coreboot/trunk@2935 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

1 files changed, 77 insertions, 129 deletions

diff --git a/src/northbridge/amd/amdk8/raminit.c b/src/northbridge/amd/amdk8/raminit.c
index 6840420552..2e05bffe0f 100644
--- a/src/northbridge/amd/amdk8/raminit.c
+++ b/src/northbridge/amd/amdk8/raminit.c
@@ -1177,6 +1177,7 @@ static long spd_handle_unbuffered_dimms(const struct mem_controller *ctrl, long
 	int i;
 	int registered;
 	int unbuffered;
+	int has_dualch = is_opteron(ctrl);
 	uint32_t dcl;
 	unbuffered = 0;
 	registered = 0;
@@ -1201,17 +1202,22 @@ static long spd_handle_unbuffered_dimms(const struct mem_controller *ctrl, long
 	if (unbuffered && registered) {
 		die("Mixed buffered and registered dimms not supported");
 	}
-#if 1
-	// yhlu debug: Athlon64 939 can do dual channel, but it uses unbuffered DIMMs
-	if (unbuffered && is_opteron(ctrl)) {
-		die("Unbuffered Dimms not supported on Opteron");
-	}
-#endif
 
 	dcl = pci_read_config32(ctrl->f2, DRAM_CONFIG_LOW);
 	dcl &= ~DCL_UnBufDimm;
 	if (unbuffered) {
-		dcl |= DCL_UnBufDimm;
+		if ((has_dualch) && (!is_cpu_pre_d0())) {
+			dcl |= DCL_UnBufDimm; /* set DCL_DualDIMMen too? */
+			
+			/* set DCL_En2T if you have non-equal DDR mem types! */
+			
+			if ((cpuid_eax(1) & 0x30) == 0x30) {
+				/* CS[7:4] is copy of CS[3:0], should be set for 939 socket */
+				dcl |= DCL_UpperCSMap;
+			}
+		} else {
+			dcl |= DCL_UnBufDimm;
+		}
 	}
 	pci_write_config32(ctrl->f2, DRAM_CONFIG_LOW, dcl);
 #if 0
@@ -1333,6 +1339,9 @@ struct mem_param {
 	uint32_t dch_memclk;
 	uint16_t dch_tref4k, dch_tref8k;
 	uint8_t	 dtl_twr;
+	uint8_t	 dtl_twtr;
+	uint8_t  dtl_trwt[3][3]; /* first index is CAS_LAT 2/2.5/3 and 128/registered64/64 */
+ 	uint8_t	 rdpreamble[4]; /* 0 is for registered, 1 for 1-2 DIMMS, 2 and 3 for 3 or 4 unreg dimm slots */
 	char name[9];
 };
 
@@ -1349,6 +1358,9 @@ static const struct mem_param *get_mem_param(unsigned min_cycle_time)
 			.dch_tref4k = DTH_TREF_100MHZ_4K,
 			.dch_tref8k = DTH_TREF_100MHZ_8K,
 			.dtl_twr    = 2,
+			.dtl_twtr   = 1,
+			.dtl_trwt   = { { 2, 2, 3 }, { 3, 3, 4 }, { 3, 3, 4 }},
+			.rdpreamble = { ((9 << 1) + 0), ((9 << 1) + 0), ((9 << 1) + 0), ((9 << 1) + 0) }
 		},
 		{
 			.name	    = "133Mhz\r\n",
@@ -1360,6 +1372,9 @@ static const struct mem_param *get_mem_param(unsigned min_cycle_time)
 			.dch_tref4k = DTH_TREF_133MHZ_4K,
 			.dch_tref8k = DTH_TREF_133MHZ_8K,
 			.dtl_twr    = 2,
+			.dtl_twtr   = 1,
+			.dtl_trwt   = { { 2, 2, 3 }, { 3, 3, 4 }, { 3, 3, 4 }},
+			.rdpreamble = { ((8 << 1) + 0), ((7 << 1) + 0), ((7 << 1) + 1), ((7 << 1) + 0) }
 		},
 		{
 			.name	    = "166Mhz\r\n",
@@ -1371,6 +1386,9 @@ static const struct mem_param *get_mem_param(unsigned min_cycle_time)
 			.dch_tref4k = DTH_TREF_166MHZ_4K,
 			.dch_tref8k = DTH_TREF_166MHZ_8K,
 			.dtl_twr    = 3,
+			.dtl_twtr   = 1,
+			.dtl_trwt   = { { 3, 2, 3 }, { 3, 3, 4 }, { 4, 3, 4 }},
+			.rdpreamble = { ((7 << 1) + 1), ((6 << 1) + 0), ((6 << 1) + 1), ((6 << 1) + 0) }
 		},
 		{
 			.name	    = "200Mhz\r\n",
@@ -1382,6 +1400,9 @@ static const struct mem_param *get_mem_param(unsigned min_cycle_time)
 			.dch_tref4k = DTH_TREF_200MHZ_4K,
 			.dch_tref8k = DTH_TREF_200MHZ_8K,
 			.dtl_twr    = 3,
+			.dtl_twtr   = 2,
+			.dtl_trwt   = { { 0, 2, 3 }, { 3, 3, 4 }, { 3, 3, 4 }},
+			.rdpreamble = { ((7 << 1) + 0), ((5 << 1) + 0), ((5 << 1) + 1), ((5 << 1) + 1) }
 		},
 		{
 			.cycle_time = 0x00,
@@ -1423,8 +1444,8 @@ static struct spd_set_memclk_result spd_set_memclk(const struct mem_controller *
 		[NBCAP_MEMCLK_100MHZ] = 0xa0, /* 10ns */
 	};
 
-
 	value = pci_read_config32(ctrl->f3, NORTHBRIDGE_CAP);
+
 	min_cycle_time = min_cycle_times[(value >> NBCAP_MEMCLK_SHIFT) & NBCAP_MEMCLK_MASK];
 	bios_cycle_time = min_cycle_times[
 		read_option(CMOS_VSTART_max_mem_clock, CMOS_VLEN_max_mem_clock, 0)];
@@ -1877,75 +1898,47 @@ static int count_dimms(const struct mem_controller *ctrl)
 static void set_Twtr(const struct mem_controller *ctrl, const struct mem_param *param)
 {
 	uint32_t dth;
-	unsigned clocks;
-	clocks = 1; /* AMD says hard code this */
+
 	dth = pci_read_config32(ctrl->f2, DRAM_TIMING_HIGH);
 	dth &= ~(DTH_TWTR_MASK << DTH_TWTR_SHIFT);
-	dth |= ((clocks - DTH_TWTR_BASE) << DTH_TWTR_SHIFT);
+	dth |= ((param->dtl_twtr - DTH_TWTR_BASE) << DTH_TWTR_SHIFT);
 	pci_write_config32(ctrl->f2, DRAM_TIMING_HIGH, dth);
 }
 
 static void set_Trwt(const struct mem_controller *ctrl, const struct mem_param *param)
 {
 	uint32_t dth, dtl;
-	unsigned divisor;
 	unsigned latency;
 	unsigned clocks;
+	int lat, mtype;
 
 	clocks = 0;
 	dtl = pci_read_config32(ctrl->f2, DRAM_TIMING_LOW);
 	latency = (dtl >> DTL_TCL_SHIFT) & DTL_TCL_MASK;
-	divisor = param->divisor;
 
 	if (is_opteron(ctrl)) {
-		if (latency == DTL_CL_2) {
-			if (divisor == ((6 << 0) + 0)) {
-				/* 166Mhz */
-				clocks = 3;
-			}
-			else if (divisor > ((6 << 0)+0)) {
-				/* 100Mhz && 133Mhz */
-				clocks = 2;
-			}
-		}
-		else if (latency == DTL_CL_2_5) {
-			clocks = 3;
-		}
-		else if (latency == DTL_CL_3) {
-			if (divisor == ((6 << 0)+0)) {
-				/* 166Mhz */
-				clocks = 4;
-			}
-			else if (divisor > ((6 << 0)+0)) {
-				/* 100Mhz && 133Mhz */
-				clocks = 3;
-			}
-		}
+		mtype = 0; /* dual channel */
+	} else if (is_registered(ctrl)) {
+		mtype = 1; /* registered 64bit interface */
+	} else {
+		mtype = 2; /* unbuffered 64bit interface */
 	}
-	else /* Athlon64 */ {
-		if (is_registered(ctrl)) {
-			if (latency == DTL_CL_2) {
-				clocks = 2;
-			}
-			else if (latency == DTL_CL_2_5) {
-				clocks = 3;
-			}
-			else if (latency == DTL_CL_3) {
-				clocks = 3;
-			}
-		}
-		else /* Unbuffered */{
-			if (latency == DTL_CL_2) {
-				clocks = 3;
-			}
-			else if (latency == DTL_CL_2_5) {
-				clocks = 4;
-			}
-			else if (latency == DTL_CL_3) {
-				clocks = 4;
-			}
-		}
+
+	switch (latency) {
+		case DTL_CL_2:
+			lat = 0;
+			break;
+		case DTL_CL_2_5:
+			lat = 1;
+			break;
+		case DTL_CL_3:
+			lat = 2;
+			break;
+		default:
+			die("Unknown LAT for Trwt");
 	}
+
+	clocks = param->dtl_trwt[lat][mtype];
 	if ((clocks < DTH_TRWT_MIN) || (clocks > DTH_TRWT_MAX)) {
 		die("Unknown Trwt\r\n");
 	}
@@ -1977,83 +1970,38 @@ static void set_Twcl(const struct mem_controller *ctrl, const struct mem_param *
 static void set_read_preamble(const struct mem_controller *ctrl, const struct mem_param *param)
 {
 	uint32_t dch;
-	unsigned divisor;
 	unsigned rdpreamble;
-	divisor = param->divisor;
-	dch = pci_read_config32(ctrl->f2, DRAM_CONFIG_HIGH);
-	dch &= ~(DCH_RDPREAMBLE_MASK << DCH_RDPREAMBLE_SHIFT);
-	rdpreamble = 0;
-	if (is_registered(ctrl)) {
-		if (divisor == ((10 << 1)+0)) {
-			/* 100Mhz, 9ns */
-			rdpreamble = ((9 << 1)+ 0);
-		}
-		else if (divisor == ((7 << 1)+1)) {
-			/* 133Mhz, 8ns */
-			rdpreamble = ((8 << 1)+0);
-		}
-		else if (divisor == ((6 << 1)+0)) {
-			/* 166Mhz, 7.5ns */
-			rdpreamble = ((7 << 1)+1);
-		}
-		else if (divisor == ((5 << 1)+0)) {
-			/* 200Mhz,  7ns */
-			rdpreamble = ((7 << 1)+0);
+	int slots, i;
+
+	slots = 0;
+
+	for(i = 0; i < 4; i++) {
+		if (ctrl->channel0[i]) {
+			slots += 1;
 		}
 	}
-	else {
-		int slots;
-		int i;
-		slots = 0;
-		for(i = 0; i < 4; i++) {
-			if (ctrl->channel0[i]) {
-				slots += 1;
-			}
-		}
-		if (divisor == ((10 << 1)+0)) {
-			/* 100Mhz */
-			if (slots <= 2) {
-				/* 9ns */
-				rdpreamble = ((9 << 1)+0);
-			} else {
-				/* 14ns */
-				rdpreamble = ((14 << 1)+0);
-			}
-		}
-		else if (divisor == ((7 << 1)+1)) {
-			/* 133Mhz */
-			if (slots <= 2) {
-				/* 7ns */
-				rdpreamble = ((7 << 1)+0);
-			} else {
-				/* 11 ns */
-				rdpreamble = ((11 << 1)+0);
-			}
-		}
-		else if (divisor == ((6 << 1)+0)) {
-			/* 166Mhz */
-			if (slots <= 2) {
-				/* 6ns */
-				rdpreamble = ((7 << 1)+0);
-			} else {
-				/* 9ns */
-				rdpreamble = ((9 << 1)+0);
-			}
-		}
-		else if (divisor == ((5 << 1)+0)) {
-			/* 200Mhz */
-			if (slots <= 2) {
-				/* 5ns */
-				rdpreamble = ((5 << 1)+0);
-			} else {
-				/* 7ns */
-				rdpreamble = ((7 << 1)+0);
-			}
-		}
+
+	/* map to index to param.rdpreamble array */
+	if (is_registered(ctrl)) {
+		i = 0;
+	} else if (slots < 3) {
+		i = 1;
+	} else if (slots == 3) {
+		i = 2;
+	} else if (slots == 4) {
+		i = 3;
+	} else {
+		die("Unknown rdpreamble for this nr of slots");
 	}
+
+	dch = pci_read_config32(ctrl->f2, DRAM_CONFIG_HIGH);
+	dch &= ~(DCH_RDPREAMBLE_MASK << DCH_RDPREAMBLE_SHIFT);
+	rdpreamble = param->rdpreamble[i];
+
 	if ((rdpreamble < DCH_RDPREAMBLE_MIN) || (rdpreamble > DCH_RDPREAMBLE_MAX)) {
 		die("Unknown rdpreamble");
 	}
+
 	dch |= (rdpreamble - DCH_RDPREAMBLE_BASE) << DCH_RDPREAMBLE_SHIFT;
 	pci_write_config32(ctrl->f2, DRAM_CONFIG_HIGH, dch);
 }