util: Import autoport with Haswell patches

This is a copy of coreboot's autoport utility, with a patch applied to
support Haswell/Lynx Point platforms. That patch is currently in review
on coreboot's Gerrit.

https://review.coreboot.org/c/coreboot/+/30890

Signed-off-by: Nicholas Chin <nic.c3.14@gmail.com>

util/autoport/root.go

@@ -0,0 +1,47 @@
+package main
+
+import "fmt"
+import "os"
+
+var supportedPCIDevices map[uint32]PCIDevice = map[uint32]PCIDevice{}
+var PCIMap map[PCIAddr]PCIDevData = map[PCIAddr]PCIDevData{}
+
+func ScanRoot(ctx Context) {
+	for _, pciDev := range ctx.InfoSource.GetPCIList() {
+		PCIMap[pciDev.PCIAddr] = pciDev
+	}
+	for _, pciDev := range ctx.InfoSource.GetPCIList() {
+		vendevid := (uint32(pciDev.PCIDevID) << 16) | uint32(pciDev.PCIVenID)
+
+		dev, ok := supportedPCIDevices[vendevid]
+		if !ok {
+			if pciDev.PCIAddr.Bus != 0 {
+				fmt.Printf("Unknown PCI device %04x:%04x, assuming removable\n",
+					pciDev.PCIVenID, pciDev.PCIDevID)
+				continue
+			}
+			fmt.Printf("Unsupported PCI device %04x:%04x\n",
+				pciDev.PCIVenID, pciDev.PCIDevID)
+			dev = GenericPCI{Comment: fmt.Sprintf("Unsupported PCI device %04x:%04x",
+				pciDev.PCIVenID, pciDev.PCIDevID)}
+		}
+		dev.Scan(ctx, pciDev)
+	}
+	if SouthBridge == nil {
+		fmt.Println("Could not detect southbridge. Aborting!")
+		os.Exit(1)
+	}
+	dmi := ctx.InfoSource.GetDMI()
+	if !dmi.IsLaptop {
+		NoEC(ctx)
+	} else if dmi.Vendor == "LENOVO" {
+		LenovoEC(ctx)
+	} else {
+		FIXMEEC(ctx)
+	}
+}
+
+func RegisterPCI(VenID uint16, DevID uint16, dev PCIDevice) {
+	vendevid := (uint32(DevID) << 16) | uint32(VenID)
+	supportedPCIDevices[vendevid] = dev
+}