danube: modify to use the generic timer interface

Actual timer support is not yet available for Danube, it will be added
soon. For now, just to make the target build, modify it to use
GENERIC_UDELAY and HAVE_MONOTONIC_TIMER configuration option.

BUG=none
TEST=the target builds again

Change-Id: Ie3289eace9d2baadd01bd641b5dffc635ac80c0f
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/220395
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/soc/imgtec/danube/Kconfig

@@ -22,6 +22,8 @@
 config CPU_IMGTEC_DANUBE
 	select CPU_MIPS
 	select DYNAMIC_CBMEM
+	select GENERIC_UDELAY
+	select HAVE_MONOTONIC_TIMER
 	select HAVE_UART_MEMORY_MAPPED
 	select HAVE_UART_SPECIAL
 	bool

src/soc/imgtec/danube/Makefile.inc

@@ -30,9 +30,11 @@ romstage-y += uart.c
 ramstage-y += uart.c
 endif
 
+bootblock-y += monotonic_timer.c
 bootblock-y += timestamp.c
 
 ramstage-y += cbmem.c
+ramstage-y += monotonic_timer.c
 ramstage-y += timestamp.c
 
 romstage-y += cbmem.c

src/soc/imgtec/danube/monotonic_timer.c

@@ -0,0 +1,25 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2014 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <timer.h>
+
+void timer_monotonic_get(struct mono_time *mt)
+{
+	/* to be defined */
+}