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>
diff --git a/drivers/net/netxen/netxen_nic_main.c b/drivers/net/netxen/netxen_nic_main.c
index 1399102..557e76c 100644
--- a/drivers/net/netxen/netxen_nic_main.c
+++ b/drivers/net/netxen/netxen_nic_main.c
@@ -643,9 +643,10 @@
 		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