Improving BKDG implementation of P-states,

CPU and northbridge frequency and voltage
handling for Fam 10 in SVI mode.

Bring F3xD4 (Clock/Power Control Register 0) more in line
with BKDG i more cases. It requires looking at the CPU package type
so I add a function for that (in the wrong place?) and some
new constants

Signed-off-by: Xavi Drudis Ferran <xdrudis@tinet.cat>
Acked-by: Marc Jones <marcj303@gmail.com>



git-svn-id: svn://svn.coreboot.org/coreboot/trunk@6395 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

src/cpu/amd/model_10xxx/fidvid.c

@@ -179,14 +179,49 @@ static void recalculateVsSlamTimeSettingOnCorePre(device_t dev)
 	pci_write_config32(dev, 0xd8, dtemp);
 }
 
-static u32 power_up_down(int node) {
+static u32 nb_clk_did(int node, u32 cpuRev,u8 procPkg) {
+        u8 link0isGen3 = 0; 
+        u8 offset;
+        if (AMD_CpuFindCapability(node, 0, &offset)) {
+	  link0isGen3 = (AMD_checkLinkType(node, 0, offset) & HTPHY_LINKTYPE_HT3 );
+	}
+        /* FIXME: NB_CLKDID should be 101b for AMD_DA_C2 in package 
+           S1g3 in link Gen3 mode, but I don't know how to tell 
+           package S1g3 from S1g4 */  
+	if ((cpuRev & AMD_DA_C2) && (procPkg & AMD_PKGTYPE_S1gX) 
+           && link0isGen3) {
+	  return 5 ; /* divide clk by 128*/  
+        } else {  
+	  return 4 ; /* divide clk by 16 */
+        }
+}
+
+
+static u32 power_up_down(int node, u8 procPkg) {
        u32 dword=0;
-	/* check platform type */
+        /* from CPU rev guide #41322 rev 3.74 June 2010 Table 26 */
-	if (!(get_platform_type() & AMD_PTYPE_SVR)) {
+        u8 singleLinkFlag = ((procPkg == AMD_PKGTYPE_AM3_2r2) 
-		/* For non-server platform
+                             || (procPkg == AMD_PKGTYPE_S1gX) 
+                             || (procPkg == AMD_PKGTYPE_ASB2));
+
+        if (singleLinkFlag) {
+	  /*	 
            * PowerStepUp=01000b - 50nS
 	   * PowerStepDown=01000b - 50ns
 	   */
+	  dword |= PW_STP_UP50 | PW_STP_DN50;
+	} else {
+          u32 dispRefModeEn = (pci_read_config32(NODE_PCI(node,0),0x68) >> 24) & 1; 
+          u32 isocEn = 0;
+          int j; 
+	  for(j=0 ; (j<4) && (!isocEn) ; j++ ) {
+	    u8 offset;
+	    if (AMD_CpuFindCapability(node, j, &offset)) {
+	      isocEn = (pci_read_config32(NODE_PCI(node,0),offset+4) >>12) & 1;
+	    }
+          }  
+
+          if (dispRefModeEn || isocEn) {
         	dword |= PW_STP_UP50 | PW_STP_DN50 ; 
           } else {
 		/* get number of cores for PowerStepUp & PowerStepDown in server
@@ -211,27 +246,30 @@ static u32 power_up_down(int node) {
 			break;
 		}
 	  }
+	}
         return dword; 
 }
 
-static void config_clk_power_ctrl_reg0(int node) {         
+static void config_clk_power_ctrl_reg0(int node, u32 cpuRev, u8 procPkg) {         
        	device_t dev = NODE_PCI(node, 3);
 
-
 	/* Program fields in Clock Power/Control register0 (F3xD4) */
 
 	/* set F3xD4 Clock Power/Timing Control 0 Register
 	 * NbClkDidApplyAll=1b
-	 * NbClkDid=100b
+	 * NbClkDid=100b or 101b 
 	 * PowerStepUp= "platform dependent"
 	 * PowerStepDown= "platform dependent"
 	 * LinkPllLink=01b
-	 * ClkRampHystSel=HW default
+	 * ClkRampHystCtl=HW default
+         * ClkRampHystSel=1111b
 	 */
         u32 dword= pci_read_config32(dev, 0xd4);
 	dword &= CPTC0_MASK;
-	dword |= NB_CLKDID_ALL | NB_CLKDID | LNK_PLL_LOCK;	/* per BKDG */
+        dword |= NB_CLKDID_ALL | LNK_PLL_LOCK | CLK_RAMP_HYST_SEL_VAL;
-        dword |= power_up_down(node);
+        dword |= (nb_clk_did(node,cpuRev,procPkg) <<  NB_CLKDID_SHIFT);
+
+        dword |= power_up_down(node, procPkg);
 
 	pci_write_config32(dev, 0xd4, dword);
 
@@ -296,13 +334,15 @@ static void prep_fid_change(void)
 	for (i = 0; i < nodes; i++) {
 		printk(BIOS_DEBUG, "Prep FID/VID Node:%02x \n", i);
 		dev = NODE_PCI(i, 3);
+                u32 cpuRev = mctGetLogicalCPUID(0xFF) ;
+	        u8 procPkg =  mctGetProcessorPackageType();
 
 		setVSRamp(dev);
 		/* BKDG r31116 2010-04-22  2.4.1.7 step b F3xD8[VSSlamTime] */
 		/* Figure out the value for VsSlamTime and program it */
 		recalculateVsSlamTimeSettingOnCorePre(dev);
 
-		config_clk_power_ctrl_reg0(i);
+                config_clk_power_ctrl_reg0(i,cpuRev,procPkg);
 
                 config_power_ctrl_misc_reg(dev);
 

src/northbridge/amd/amdfam10/raminit_amdmct.c

@@ -214,6 +214,11 @@ u32 mctGetLogicalCPUID(u32 Node)
 	return ret;
 }
 
+static u8 mctGetProcessorPackageType(void) {
+	/* FIXME: I guess this belongs wherever mctGetLogicalCPUID ends up ? */
+     u32 BrandId = cpuid_ebx(0x80000001);
+     return (u8)((BrandId >> 28) & 0x0F);
+}
 
 static void raminit_amdmct(struct sys_info *sysinfo)
 {

src/northbridge/amd/amdht/AsPsDefs.h

@@ -111,6 +111,7 @@
 #define NB_FID_EN 0x20			/* NbFidEn bit ON */
 #define NB_CLKDID_ALL 0x80000000	/* NbClkDidApplyAll bit ON */
 #define NB_CLKDID     0x40000000	/* NbClkDid value set by BIOS */
+#define NB_CLKDID_SHIFT   28	        /* NbClkDid bit shift */
 #define PW_STP_UP50   0x08000000	/* PowerStepUp 50nS(1000b) */
 #define PW_STP_DN50   0x00800000	/* PowerStepDown 50nS (1000b)*/
 #define PW_STP_UP100  0x03000000	/* PowerStepUp 100nS(0011b) */
@@ -119,6 +120,11 @@
 #define PW_STP_DN200  0x00200000	/* PowerStepDown 200nS (0010b)*/
 #define PW_STP_UP400  0x00000000	/* PowerStepUp 400nS(0000b) */
 #define PW_STP_DN400  0x00000000	/* PowerStepDown 400nS (0000b)*/
+#define CLK_RAMP_HYST_SEL_VAL 0x00000f00 /* value mask for clock ramp
+					    hysteresis select. BIOS
+					    should program
+					    F3xC4[ClkRampHystSel] to
+					    1111b */
 
 
 #define LNK_PLL_LOCK  0x00010000	/* LnkPllLock value set (01b) by BIOS */

src/northbridge/amd/amdmct/amddefs.h

@@ -134,3 +134,13 @@
 #define DC_CFG			0xC0011022
 #define BU_CFG			0xC0011023
 #define BU_CFG2		0xC001102A
+
+/*
+ * Processor package types 
+ */
+#define AMD_PKGTYPE_FrX_1207 0
+#define AMD_PKGTYPE_AM3_2r2 1
+#define AMD_PKGTYPE_S1gX 2
+#define AMD_PKGTYPE_G34 3
+#define AMD_PKGTYPE_ASB2 4
+#define AMD_PKGTYPE_C32 5