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.h b/drivers/net/netxen/netxen_nic.h
index 2371888..7e3d2b9 100644
--- a/drivers/net/netxen/netxen_nic.h
+++ b/drivers/net/netxen/netxen_nic.h
@@ -552,8 +552,8 @@
 
 	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;