RESEND [PATCH 2/3] NetXen: Support per PCI-function interrupt mask registers

This patch updates the various access routines to access different
control and status settings present in different register locations.
This will fix problems related to working of different ports in
multi Port card.

Signed-off by: Dhananjay Phadke <dhananjay@netxen.com>
Signed-off by: Milan Bag <mbag@netxen.com>

Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/net/netxen/netxen_nic.h

@@ -937,6 +937,7 @@ struct netxen_adapter {
 	struct netxen_ring_ctx *ctx_desc;
 	struct pci_dev *ctx_desc_pdev;
 	dma_addr_t ctx_desc_phys_addr;
+	int intr_scheme;
 	int (*enable_phy_interrupts) (struct netxen_adapter *);
 	int (*disable_phy_interrupts) (struct netxen_adapter *);
 	void (*handle_phy_intr) (struct netxen_adapter *);
@@ -1080,37 +1081,106 @@ struct net_device_stats *netxen_nic_get_stats(struct net_device *netdev);
 
 static inline void netxen_nic_disable_int(struct netxen_adapter *adapter)
 {
-	/*
-	 * ISR_INT_MASK: Can be read from window 0 or 1.
-	 */
-	writel(0x7ff, PCI_OFFSET_SECOND_RANGE(adapter, ISR_INT_MASK));
+	uint32_t	mask = 0x7ff;
+	int retries = 32;
+
+	DPRINTK(1, INFO, "Entered ISR Disable \n");
+
+	switch (adapter->portnum) {
+	case 0:
+		writel(0x0, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_0));
+		break;
+	case 1:
+		writel(0x0, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_1));
+		break;
+	case 2:
+		writel(0x0, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_2));
+		break;
+	case 3:
+		writel(0x0, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_3));
+		break;
+	}
+
+	if (adapter->intr_scheme != -1 &&
+		adapter->intr_scheme != INTR_SCHEME_PERPORT) {
+		writel(mask,
+			(void *)(PCI_OFFSET_SECOND_RANGE(adapter, ISR_INT_MASK)));
+	}
+
+	/* Window = 0 or 1 */
+	if (!(adapter->flags & NETXEN_NIC_MSI_ENABLED)) {
+		do {
+			writel(0xffffffff, (void *)
+				(PCI_OFFSET_SECOND_RANGE(adapter, ISR_INT_TARGET_STATUS)));
+			mask = readl((void *)
+					(pci_base_offset(adapter, ISR_INT_VECTOR)));
+			if (!(mask & 0x80))
+				break;
+			udelay(10);
+		} while (--retries);
+
+		if (!retries) {
+			printk(KERN_NOTICE "%s: Failed to disable interrupt completely\n",
+					netxen_nic_driver_name);
+		}
+	}
+
+	DPRINTK(1, INFO, "Done with Disable Int\n");
 
+	return;
 }
 
 static inline void netxen_nic_enable_int(struct netxen_adapter *adapter)
 {
 	u32 mask;
 
-	switch (adapter->ahw.board_type) {
-	case NETXEN_NIC_GBE:
-		mask = 0x77b;
+	DPRINTK(1, INFO, "Entered ISR Enable \n");
+
+	if (adapter->intr_scheme != -1 &&
+		adapter->intr_scheme != INTR_SCHEME_PERPORT) {
+		switch (adapter->ahw.board_type) {
+		case NETXEN_NIC_GBE:
+			mask  =  0x77b;
+			break;
+		case NETXEN_NIC_XGBE:
+			mask  =  0x77f;
+			break;
+		default:
+			mask  =  0x7ff;
+			break;
+		}
+
+		writel(mask,
+			(void *)(PCI_OFFSET_SECOND_RANGE(adapter, ISR_INT_MASK)));
+	}
+	switch (adapter->portnum) {
+	case 0:
+		writel(0x1, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_0));
 		break;
-	case NETXEN_NIC_XGBE:
-		mask = 0x77f;
+	case 1:
+		writel(0x1, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_1));
 		break;
-	default:
-		mask = 0x7ff;
+	case 2:
+		writel(0x1, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_2));
+		break;
+	case 3:
+		writel(0x1, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_3));
 		break;
 	}
 
-	writel(mask, PCI_OFFSET_SECOND_RANGE(adapter, ISR_INT_MASK));
-
 	if (!(adapter->flags & NETXEN_NIC_MSI_ENABLED)) {
 		mask = 0xbff;
-		writel(0X0, NETXEN_CRB_NORMALIZE(adapter, CRB_INT_VECTOR));
-		writel(mask, PCI_OFFSET_SECOND_RANGE(adapter,
-						     ISR_INT_TARGET_MASK));
+		if (adapter->intr_scheme != -1 &&
+			adapter->intr_scheme != INTR_SCHEME_PERPORT) {
+			writel(0X0, NETXEN_CRB_NORMALIZE(adapter, CRB_INT_VECTOR));
+		}
+		writel(mask,
+			(void *)(PCI_OFFSET_SECOND_RANGE(adapter, ISR_INT_TARGET_MASK)));
 	}
+
+	DPRINTK(1, INFO, "Done with enable Int\n");
+
+	return;
 }
 
 /*

drivers/net/netxen/netxen_nic_hw.c

@@ -392,7 +392,11 @@ int netxen_nic_hw_resources(struct netxen_adapter *adapter)
 			return err;
 		}
 	}
-	DPRINTK(INFO, "Recieve Peg ready too. starting stuff\n");
+	adapter->intr_scheme = readl(
+		NETXEN_CRB_NORMALIZE(adapter, CRB_NIC_CAPABILITIES_FW));
+	printk(KERN_NOTICE "%s: FW capabilities:0x%x\n", netdev->name,
+			adapter->intr_scheme);
+	DPRINTK(INFO, "Receive Peg ready too. starting stuff\n");
 
 	addr = netxen_alloc(adapter->ahw.pdev,
 			    sizeof(struct netxen_ring_ctx) +

drivers/net/netxen/netxen_nic_init.c

@@ -139,6 +139,8 @@ int netxen_init_firmware(struct netxen_adapter *adapter)
 		return err;
 	}
 	/* Window 1 call */
+	writel(INTR_SCHEME_PERPORT,
+	       NETXEN_CRB_NORMALIZE(adapter, CRB_NIC_CAPABILITIES_HOST));
 	writel(MPORT_MULTI_FUNCTION_MODE,
 	       NETXEN_CRB_NORMALIZE(adapter, CRB_MPORT_MODE));
 	writel(PHAN_INITIALIZE_ACK,

drivers/net/netxen/netxen_nic_main.c

@@ -308,7 +308,13 @@ netxen_nic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 
 	adapter->netdev  = netdev;
 	adapter->pdev    = pdev;
+
+	/* this will be read from FW later */
+	adapter->intr_scheme = -1;
+
+	/* This will be reset for mezz cards  */
 	adapter->portnum = pci_func_id;
+	adapter->status   &= ~NETXEN_NETDEV_STATUS;
 
 	netdev->open		   = netxen_nic_open;
 	netdev->stop		   = netxen_nic_close;
@@ -1100,28 +1106,26 @@ static int
 netxen_handle_int(struct netxen_adapter *adapter, struct net_device *netdev)
 {
 	u32 ret = 0;
+	u32 our_int = 0;
 
 	DPRINTK(INFO, "Entered handle ISR\n");
 	adapter->stats.ints++;
 
 	if (!(adapter->flags & NETXEN_NIC_MSI_ENABLED)) {
-		int count = 0;
-		u32 mask;
-		u32 our_int = 0;
 		our_int = readl(NETXEN_CRB_NORMALIZE(adapter, CRB_INT_VECTOR));
 		/* not our interrupt */
 		if ((our_int & (0x80 << adapter->portnum)) == 0)
 			return ret;
-		netxen_nic_disable_int(adapter);
-		/* Window = 0 or 1 */
-		do {
-			writel(0xffffffff, PCI_OFFSET_SECOND_RANGE(adapter,
-						ISR_INT_TARGET_STATUS));
-			mask = readl(pci_base_offset(adapter, ISR_INT_VECTOR));
-		} while (((mask & 0x80) != 0) && (++count < 32));
-		if ((mask & 0x80) != 0)
-			printk("Could not disable interrupt completely\n");
+	}
 
+	netxen_nic_disable_int(adapter);
+
+	if (adapter->intr_scheme == INTR_SCHEME_PERPORT) {
+		/* claim interrupt */
+		if (!(adapter->flags & NETXEN_NIC_MSI_ENABLED)) {
+			writel(our_int & ~((u32)(0x80 << adapter->portnum)),
+			NETXEN_CRB_NORMALIZE(adapter, CRB_INT_VECTOR));
+		}
 	}
 
 	if (netxen_nic_rx_has_work(adapter) || netxen_nic_tx_has_work(adapter)) {
@@ -1133,7 +1137,7 @@ netxen_handle_int(struct netxen_adapter *adapter, struct net_device *netdev)
 		} else {
 			static unsigned int intcount = 0;
 			if ((++intcount & 0xfff) == 0xfff)
-				printk(KERN_ERR
+				DPRINTK(KERN_ERR
 				       "%s: %s interrupt %d while in poll\n",
 				       netxen_nic_driver_name, netdev->name,
 				       intcount);

drivers/net/netxen/netxen_nic_phan_reg.h

@@ -114,6 +114,20 @@
 #define CRB_V2P_3		    NETXEN_NIC_REG(0x29c)
 #define CRB_V2P(port)		    (CRB_V2P_0+((port)*4))
 #define CRB_DRIVER_VERSION	    NETXEN_NIC_REG(0x2a0)
+/* sw int status/mask registers */
+#define CRB_SW_INT_MASK_0	   NETXEN_NIC_REG(0x1d8)
+#define CRB_SW_INT_MASK_1	   NETXEN_NIC_REG(0x1e0)
+#define CRB_SW_INT_MASK_2	   NETXEN_NIC_REG(0x1e4)
+#define CRB_SW_INT_MASK_3	   NETXEN_NIC_REG(0x1e8)
+
+/*
+ * capabilities register, can be used to selectively enable/disable features
+ * for backward compability
+ */
+#define CRB_NIC_CAPABILITIES_HOST	NETXEN_NIC_REG(0x1a8)
+#define CRB_NIC_CAPABILITIES_FW	  	NETXEN_NIC_REG(0x1dc)
+
+#define INTR_SCHEME_PERPORT	      	0x1
 
 /* used for ethtool tests */
 #define CRB_SCRATCHPAD_TEST	    NETXEN_NIC_REG(0x280)