nfp: refactor the per-chip PCIe config

Use a switch statement instead of ifs for code dependent
on chip version.  While at it make sure we fail for unknown
chip revisions.
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/netronome/nfp/nfpcore/nfp6000_pcie.c

@@ -138,6 +138,7 @@
 
 /* The number of explicit BARs to reserve.
  * Minimum is 0, maximum is 4 on the NFP6000.
+ * The NFP3800 can have only one per PF.
  */
 #define NFP_PCIE_EXPLICIT_BARS		2
 
@@ -589,8 +590,8 @@ static int enable_bars(struct nfp6000_pcie *nfp, u16 interface)
 			NFP_PCIE_BAR_PCIE2CPP_MapType_EXPLICIT3),
 	};
 	char status_msg[196] = {};
+	int i, err, bars_free;
 	struct nfp_bar *bar;
-	int i, bars_free;
 	int expl_groups;
 	char *msg, *end;
 
@@ -643,6 +644,8 @@ static int enable_bars(struct nfp6000_pcie *nfp, u16 interface)
 		bar->iomem = ioremap_nocache(nfp_bar_resource_start(bar),
 					     nfp_bar_resource_len(bar));
 	if (bar->iomem) {
+		int pf;
+
 		msg += snprintf(msg, end - msg,	"0.0: General/MSI-X SRAM, ");
 		atomic_inc(&bar->refcnt);
 		bars_free--;
@@ -651,24 +654,40 @@ static int enable_bars(struct nfp6000_pcie *nfp, u16 interface)
 
 		nfp->expl.data = bar->iomem + NFP_PCIE_SRAM + 0x1000;
 
-		if (nfp->pdev->device == PCI_DEVICE_ID_NETRONOME_NFP4000 ||
-		    nfp->pdev->device == PCI_DEVICE_ID_NETRONOME_NFP5000 ||
-		    nfp->pdev->device == PCI_DEVICE_ID_NETRONOME_NFP6000) {
-			nfp->iomem.csr = bar->iomem + NFP_PCIE_BAR(0);
-		} else {
-			int pf = nfp->pdev->devfn & 7;
-
+		switch (nfp->pdev->device) {
+		case PCI_DEVICE_ID_NETRONOME_NFP3800:
+			pf = nfp->pdev->devfn & 7;
 			nfp->iomem.csr = bar->iomem + NFP_PCIE_BAR(pf);
+			break;
+		case PCI_DEVICE_ID_NETRONOME_NFP4000:
+		case PCI_DEVICE_ID_NETRONOME_NFP5000:
+		case PCI_DEVICE_ID_NETRONOME_NFP6000:
+			nfp->iomem.csr = bar->iomem + NFP_PCIE_BAR(0);
+			break;
+		default:
+			dev_err(nfp->dev, "Unsupported device ID: %04hx!\n",
+				nfp->pdev->device);
+			err = -EINVAL;
+			goto err_unmap_bar0;
 		}
 		nfp->iomem.em = bar->iomem + NFP_PCIE_EM;
 	}
 
-	if (nfp->pdev->device == PCI_DEVICE_ID_NETRONOME_NFP4000 ||
-	    nfp->pdev->device == PCI_DEVICE_ID_NETRONOME_NFP5000 ||
-	    nfp->pdev->device == PCI_DEVICE_ID_NETRONOME_NFP6000)
-		expl_groups = 4;
-	else
+	switch (nfp->pdev->device) {
+	case PCI_DEVICE_ID_NETRONOME_NFP3800:
 		expl_groups = 1;
+		break;
+	case PCI_DEVICE_ID_NETRONOME_NFP4000:
+	case PCI_DEVICE_ID_NETRONOME_NFP5000:
+	case PCI_DEVICE_ID_NETRONOME_NFP6000:
+		expl_groups = 4;
+		break;
+	default:
+		dev_err(nfp->dev, "Unsupported device ID: %04hx!\n",
+			nfp->pdev->device);
+		err = -EINVAL;
+		goto err_unmap_bar0;
+	}
 
 	/* Configure, and lock, BAR0.1 for PCIe XPB (MSI-X PBA) */
 	bar = &nfp->bar[1];
@@ -713,6 +732,11 @@ static int enable_bars(struct nfp6000_pcie *nfp, u16 interface)
 	dev_info(nfp->dev, "%sfree: %d/%d\n", status_msg, bars_free, nfp->bars);
 
 	return 0;
+
+err_unmap_bar0:
+	if (nfp->bar[0].iomem)
+		iounmap(nfp->bar[0].iomem);
+	return err;
 }
 
 static void disable_bars(struct nfp6000_pcie *nfp)

drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cpp.h

@@ -62,6 +62,10 @@
 
 #define PCI_64BIT_BAR_COUNT             3
 
+/* NFP hardware vendor/device ids.
+ */
+#define PCI_DEVICE_ID_NETRONOME_NFP3800	0x3800
+
 #define NFP_CPP_NUM_TARGETS             16
 /* Max size of area it should be safe to request */
 #define NFP_CPP_SAFE_AREA_SIZE		SZ_2M