AMD rd890 late.c: Don't enable PCIe ports after PCIe init.

PCIE devices are detected and initialized by the AMD PCIe init functions,
which is in cimx rd890. The parameters are read from devicetree.cb before PCIe init.
Now, all bridges and devices are trained on the device 0.0 enable.
After PCIe init, the PCIe ports with devices are on and the PCIe ports
without devices are off. so resources may be allocated correctly
during the rest of the PCI scan.

But if the devicetree was being used to enable/disable devices after initialization,
the problems would arise. Take a look at the serial log:

do_pci_scan_bridge for PCI: 00:02.0
PCI: pci_scan_bus for bus 01
PCI: pci_scan_bus returning with max=001
do_pci_scan_bridge returns max 1
do_pci_scan_bridge for PCI: 00:03.0
PCI: pci_scan_bus for bus 02
PCI: pci_scan_bus returning with max=002
do_pci_scan_bridge returns max 2
do_pci_scan_bridge for PCI: 00:04.0
PCI: pci_scan_bus for bus 03
PCI: pci_scan_bus returning with max=003
do_pci_scan_bridge returns max 3

PCI bridge 02.0, 03.0 and 04.0 are not inserted devices, but these bridges
are still scanned. This is not correct.

Change-Id: I87dac5f062c6926081970ed0c5f26a7e3f447395
Signed-off-by: Siyuan Wang <SiYuan.Wang@amd.com>
Signed-off-by: Siyuan Wang <wangsiyuanbuaa@gmail.com>
Reviewed-on: http://review.coreboot.org/1640
Tested-by: build bot (Jenkins)
Reviewed-by: Marc Jones <marcj303@gmail.com>

1 files changed, 26 insertions, 89 deletions

diff --git a/src/northbridge/amd/cimx/rd890/late.c b/src/northbridge/amd/cimx/rd890/late.c
index 33da2b403a..1a345a23a2 100644
--- a/src/northbridge/amd/cimx/rd890/late.c
+++ b/src/northbridge/amd/cimx/rd890/late.c
@@ -69,10 +69,7 @@ void nb_Late_Post_Init(void)
 static void rd890_enable(device_t dev)
 {
 	u32 address = 0;
-	u32 mask;
-	u32 val;
 	u32 devfn;
-	u32 port;
 	AMD_NB_CONFIG *NbConfigPtr = NULL;
 
 	u8 nb_index = 0; /* The first IO Hub, TODO: other NBs */
@@ -80,97 +77,37 @@ static void rd890_enable(device_t dev)
 	NbConfigPtr = &(gConfig.Northbridges[nb_index]);
 
 	devfn = dev->path.pci.devfn;
-	port = devfn >> 3;
 	printk(BIOS_INFO, "rd890_enable  ");
 	printk(BIOS_INFO, "Bus-%x Dev-%X Fun-%X, enable=%x\n",
 			0, (devfn >> 3), (devfn & 0x07), dev->enabled);
-	if (port != 0) {
-		if (dev->enabled) {
-			NbConfigPtr->pPcieConfig->PortConfiguration[port].ForcePortDisable = OFF;
-		} else {
-			NbConfigPtr->pPcieConfig->PortConfiguration[port].ForcePortDisable = ON;
+
+	/* we only do this once */
+	if(devfn==0) {
+		/* CIMX configuration defualt initialize */
+		rd890_cimx_config(&gConfig, &nb_cfg[0], &ht_cfg[0], &pcie_cfg[0]);
+		if (gConfig.StandardHeader.CalloutPtr != NULL) {
+			gConfig.StandardHeader.CalloutPtr(CB_AmdSetPcieEarlyConfig, (u32)dev, (VOID*)NbConfigPtr);
 		}
-	}
+		/* Reset PCIE Cores, Training the Ports selected by port_enable of devicetree
+		 * After this call EP are fully operational on particular NB
+		 */
+		nb_Pcie_Early_Init();
+
+		if (gConfig.StandardHeader.CalloutPtr != NULL) {
+			gConfig.StandardHeader.CalloutPtr(CB_AmdSetEarlyPostConfig, 0, (VOID*)NbConfigPtr);
+		}
+		nb_Early_Post_Init();
 
-	switch (port) {
-		case 0x0: /* Root Complex, and ClkConfig */
-
-			if ((devfn & 0x07) == 1) { /* skip dev-0 fun-1 */
-				break;
-			}
-
-			/* CIMX configuration defualt initialize */
-			rd890_cimx_config(&gConfig, &nb_cfg[0], &ht_cfg[0], &pcie_cfg[0]);
-			if (gConfig.StandardHeader.CalloutPtr != NULL) {
-				/* NOTE: not use LibNbCallBack */
-				gConfig.StandardHeader.CalloutPtr(CB_AmdSetPcieEarlyConfig, (u32)dev, (VOID*)NbConfigPtr);
-			}
-			/* Reset PCIE Cores, Training the Ports selected by port_enable of devicetree
-			 * After this call EP are fully operational on particular NB
-			 */
-			nb_Pcie_Early_Init();
-			break;
-
-		case 0x2: /* Gpp1 Port0 */
-		case 0x3: /* Gpp1 Port1 */
-			mask = ~(1 << port);
-			val = (dev->enabled ? 0 : 1) << port;
-			LibNbPciIndexRMW(address | NB_MISC_INDEX, NB_MISC_REG0C, AccessS3SaveWidth32, mask, val, NbConfigPtr);
-			break;
-
-		case 0x4: /* Gpp3a Port0 */
-		case 0x5: /* Gpp3a Port1 */
-		case 0x6: /* Gpp3a Port2 */
-		case 0x7: /* Gpp3a Port3 */
-			mask = ~(1 << port);
-			val = (dev->enabled ? 0 : 1) << port;
-			LibNbPciIndexRMW(address | NB_MISC_INDEX, NB_MISC_REG0C, AccessS3SaveWidth32, mask, val, NbConfigPtr);
-			break;
-
-		case 0x8: /* SB ALink */
-			mask = ~(1 << 6);
-			val = (dev->enabled ? 1 : 0) << 6;
-			LibNbPciIndexRMW(address | NB_MISC_INDEX, NB_MISC_REG0C, AccessS3SaveWidth32, mask, val, NbConfigPtr);
-			break;
-
-		case 0x9: /* Gpp3a Port4 */
-		case 0xa: /* Gpp3a Port5 */
-			mask = ~(1 << (7 + port));
-			val = (dev->enabled ? 0 : 1) << (7 + port);
-			LibNbPciIndexRMW(address | NB_MISC_INDEX, NB_MISC_REG0C, AccessS3SaveWidth32, mask, val, NbConfigPtr);
-			break;
-
-		case 0xb: /* Gpp2 Port0 */
-		case 0xc: /* Gpp2 Port1 */
-			mask = ~(1 << (7 + port));
-			val = (dev->enabled ? 0 : 1) << (7 + port);
-			LibNbPciIndexRMW(address | NB_MISC_INDEX, NB_MISC_REG0C, AccessS3SaveWidth32, mask, val, NbConfigPtr);
-			break;
-
-		case 0xd: /* Gpp3b */
-			mask = ~(1 << (7 + port));
-			val = (dev->enabled ? 0 : 1) << (7 + port);
-			LibNbPciIndexRMW(address | NB_MISC_INDEX, NB_MISC_REG0C, AccessS3SaveWidth32, mask, val, NbConfigPtr);
-
-			/* Init NB at Early Post */
-			if (gConfig.StandardHeader.CalloutPtr != NULL) {
-				gConfig.StandardHeader.CalloutPtr(CB_AmdSetEarlyPostConfig, 0, (VOID*)NbConfigPtr);
-			}
-			nb_Early_Post_Init();//
-			if (gConfig.StandardHeader.CalloutPtr != NULL) {
-				gConfig.StandardHeader.CalloutPtr(CB_AmdSetMidPostConfig, 0, (VOID*)NbConfigPtr);
-			}
-			nb_Mid_Post_Init();
-			nb_Pcie_Late_Init();
-			if (gConfig.StandardHeader.CalloutPtr != NULL) {
-				gConfig.StandardHeader.CalloutPtr(CB_AmdSetLatePostConfig, 0, (VOID*)NbConfigPtr);
-			}
-			nb_Late_Post_Init();
-			break;
-
-		default:
-			printk(BIOS_INFO, "Buggy Device Tree\n");
-			break;
+		if (gConfig.StandardHeader.CalloutPtr != NULL) {
+			gConfig.StandardHeader.CalloutPtr(CB_AmdSetMidPostConfig, 0, (VOID*)NbConfigPtr);
+		}
+		nb_Mid_Post_Init();
+		nb_Pcie_Late_Init();
+
+		if (gConfig.StandardHeader.CalloutPtr != NULL) {
+			gConfig.StandardHeader.CalloutPtr(CB_AmdSetLatePostConfig, 0, (VOID*)NbConfigPtr);
+		}
+		nb_Late_Post_Init();
 	}
 }