netxen: refactor indirect register access

Refactor code to calculate and set indirect access
window for control registers in 2MB address space
(NX3031 or newer). Use void __iomem * data type for
absolute pci addresses.
Signed-off-by: NDhananjay Phadke <dhananjay@netxen.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/netxen/netxen_nic_hw.c

@@ -1090,39 +1090,33 @@ netxen_nic_pci_set_crbwindow_128M(struct netxen_adapter *adapter,
  * In: 'off' is offset from base in 128M pci map
  */
 static int
-netxen_nic_pci_get_crb_addr_2M(struct netxen_adapter *adapter, ulong *off)
+netxen_nic_pci_get_crb_addr_2M(struct netxen_adapter *adapter,
+		ulong off, void __iomem **addr)
 {
 	crb_128M_2M_sub_block_map_t *m;
 
 
-	if (*off >= NETXEN_CRB_MAX)
+	if ((off >= NETXEN_CRB_MAX) || (off < NETXEN_PCI_CRBSPACE))
 		return -EINVAL;
 
-	if (*off >= NETXEN_PCI_CAMQM && (*off < NETXEN_PCI_CAMQM_2M_END)) {
-		*off = (*off - NETXEN_PCI_CAMQM) + NETXEN_PCI_CAMQM_2M_BASE +
-			(ulong)adapter->ahw.pci_base0;
-		return 0;
-	}
-
-	if (*off < NETXEN_PCI_CRBSPACE)
-		return -EINVAL;
-
-	*off -= NETXEN_PCI_CRBSPACE;
+	off -= NETXEN_PCI_CRBSPACE;
 
 	/*
 	 * Try direct map
 	 */
-	m = &crb_128M_2M_map[CRB_BLK(*off)].sub_block[CRB_SUBBLK(*off)];
+	m = &crb_128M_2M_map[CRB_BLK(off)].sub_block[CRB_SUBBLK(off)];
 
-	if (m->valid && (m->start_128M <= *off) && (m->end_128M > *off)) {
-		*off = *off + m->start_2M - m->start_128M +
-			(ulong)adapter->ahw.pci_base0;
+	if (m->valid && (m->start_128M <= off) && (m->end_128M > off)) {
+		*addr = adapter->ahw.pci_base0 + m->start_2M +
+			(off - m->start_128M);
 		return 0;
 	}
 
 	/*
 	 * Not in direct map, use crb window
 	 */
+	*addr = adapter->ahw.pci_base0 + CRB_INDIRECT_2M +
+		(off & MASK(16));
 	return 1;
 }
 
@@ -1132,28 +1126,26 @@ netxen_nic_pci_get_crb_addr_2M(struct netxen_adapter *adapter, ulong *off)
  * side effect: lock crb window
  */
 static void
-netxen_nic_pci_set_crbwindow_2M(struct netxen_adapter *adapter, ulong *off)
+netxen_nic_pci_set_crbwindow_2M(struct netxen_adapter *adapter, ulong off)
 {
 	u32 window;
 	void __iomem *addr = adapter->ahw.pci_base0 + CRB_WINDOW_2M;
 
-	window = CRB_HI(*off);
+	off -= NETXEN_PCI_CRBSPACE;
+
+	window = CRB_HI(off);
 
 	if (adapter->ahw.crb_win == window)
-		goto done;
+		return;
 
 	writel(window, addr);
 	if (readl(addr) != window) {
 		if (printk_ratelimit())
 			dev_warn(&adapter->pdev->dev,
 				"failed to set CRB window to %d off 0x%lx\n",
-				window, *off);
+				window, off);
 	}
 	adapter->ahw.crb_win = window;
-
-done:
-	*off = (*off & MASK(16)) + CRB_INDIRECT_2M +
-		(ulong)adapter->ahw.pci_base0;
 }
 
 static int
@@ -1217,11 +1209,12 @@ netxen_nic_hw_write_wx_2M(struct netxen_adapter *adapter, ulong off, u32 data)
 {
 	unsigned long flags;
 	int rv;
+	void __iomem *addr = NULL;
 
-	rv = netxen_nic_pci_get_crb_addr_2M(adapter, &off);
+	rv = netxen_nic_pci_get_crb_addr_2M(adapter, off, &addr);
 
 	if (rv == 0) {
-		writel(data, (void __iomem *)off);
+		writel(data, addr);
 		return 0;
 	}
 
@@ -1229,8 +1222,8 @@ netxen_nic_hw_write_wx_2M(struct netxen_adapter *adapter, ulong off, u32 data)
 		/* indirect access */
 		write_lock_irqsave(&adapter->ahw.crb_lock, flags);
 		crb_win_lock(adapter);
-		netxen_nic_pci_set_crbwindow_2M(adapter, &off);
-		writel(data, (void __iomem *)off);
+		netxen_nic_pci_set_crbwindow_2M(adapter, off);
+		writel(data, addr);
 		crb_win_unlock(adapter);
 		write_unlock_irqrestore(&adapter->ahw.crb_lock, flags);
 		return 0;
@@ -1248,18 +1241,19 @@ netxen_nic_hw_read_wx_2M(struct netxen_adapter *adapter, ulong off)
 	unsigned long flags;
 	int rv;
 	u32 data;
+	void __iomem *addr = NULL;
 
-	rv = netxen_nic_pci_get_crb_addr_2M(adapter, &off);
+	rv = netxen_nic_pci_get_crb_addr_2M(adapter, off, &addr);
 
 	if (rv == 0)
-		return readl((void __iomem *)off);
+		return readl(addr);
 
 	if (rv > 0) {
 		/* indirect access */
 		write_lock_irqsave(&adapter->ahw.crb_lock, flags);
 		crb_win_lock(adapter);
-		netxen_nic_pci_set_crbwindow_2M(adapter, &off);
-		data = readl((void __iomem *)off);
+		netxen_nic_pci_set_crbwindow_2M(adapter, off);
+		data = readl(addr);
 		crb_win_unlock(adapter);
 		write_unlock_irqrestore(&adapter->ahw.crb_lock, flags);
 		return data;
@@ -1307,17 +1301,20 @@ static u32 netxen_nic_io_read_2M(struct netxen_adapter *adapter,
 void __iomem *
 netxen_get_ioaddr(struct netxen_adapter *adapter, u32 offset)
 {
-	ulong off = offset;
+	void __iomem *addr = NULL;
 
 	if (NX_IS_REVISION_P2(adapter->ahw.revision_id)) {
-		if (offset < NETXEN_CRB_PCIX_HOST2 &&
-				offset > NETXEN_CRB_PCIX_HOST)
-			return PCI_OFFSET_SECOND_RANGE(adapter, offset);
-		return NETXEN_CRB_NORMALIZE(adapter, offset);
+		if ((offset < NETXEN_CRB_PCIX_HOST2) &&
+				(offset > NETXEN_CRB_PCIX_HOST))
+			addr = PCI_OFFSET_SECOND_RANGE(adapter, offset);
+		else
+			addr = NETXEN_CRB_NORMALIZE(adapter, offset);
+	} else {
+		WARN_ON(netxen_nic_pci_get_crb_addr_2M(adapter,
+					offset, &addr));
 	}
 
-	BUG_ON(netxen_nic_pci_get_crb_addr_2M(adapter, &off));
-	return (void __iomem *)off;
+	return addr;
 }
 
 static int