net: tsec - handle user interrupt while waiting for PHY auto negotiation to complete

if you don't have firmware installed for the PHY to come to life, this
wait can be painful - let's give the option to avoid it if we want.

Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
Acked-by: Andy Fleming <afleming@freescale.com>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>

drivers/net/tsec.c

@@ -17,6 +17,7 @@
 #include <net.h>
 #include <command.h>
 #include <tsec.h>
+#include <asm/errno.h>
 
 #include "miiphy.h"
 
@@ -380,6 +381,12 @@ uint mii_parse_sr(uint mii_reg, struct tsec_private * priv)
 				return 0;
 			}
 
+			if (ctrlc()) {
+				puts("user interrupt!\n");
+				priv->link = 0;
+				return -EINTR;
+			}
+
 			if ((i++ % 1000) == 0) {
 				putc('.');
 			}