netxen: improve pci memory access

o Access on card memory through memory controller (agent)
  rather than moving small pci window around. Clean up the
  code for moving windows around.

o Restrict memory accesss to 64 bit, currently only firmware
  download uses this.
Signed-off-by: Dhananjay Phadke <dhananjay@netxen.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/netxen/netxen_nic.h

@@ -552,8 +552,8 @@ struct netxen_hardware_context {
 
 	int qdr_sn_window;
 	int ddr_mn_window;
-	unsigned long mn_win_crb;
-	unsigned long ms_win_crb;
+	u32 mn_win_crb;
+	u32 ms_win_crb;
 
 	u8 cut_through;
 	u8 revision_id;

drivers/net/netxen/netxen_nic_main.c

@@ -643,9 +643,10 @@ netxen_setup_pci_map(struct netxen_adapter *adapter)
 		adapter->ahw.ddr_mn_window = 0;
 		adapter->ahw.qdr_sn_window = 0;
 
-		adapter->ahw.mn_win_crb = 0x100000 + PCIX_MN_WINDOW +
-			(pci_func * 0x20);
-		adapter->ahw.ms_win_crb = 0x100000 + PCIX_SN_WINDOW;
+		adapter->ahw.mn_win_crb = NETXEN_PCI_CRBSPACE +
+			0x100000 + PCIX_MN_WINDOW + (pci_func * 0x20);
+		adapter->ahw.ms_win_crb = NETXEN_PCI_CRBSPACE +
+			0x100000 + PCIX_SN_WINDOW;
 		if (pci_func < 4)
 			adapter->ahw.ms_win_crb += (pci_func * 0x20);
 		else