Implement SC520 timers

Signed-off-by: Graeme Russ <graeme.russ at gmail.com>
diff --git a/include/asm-i386/u-boot-i386.h b/include/asm-i386/u-boot-i386.h
index 9a60cac..3921e01 100644
--- a/include/asm-i386/u-boot-i386.h
+++ b/include/asm-i386/u-boot-i386.h
@@ -43,6 +43,13 @@
 
 /* cpu/.../cpu.c */
 int cpu_init(void);
+
+/* cpu/.../timer.c */
+void timer_isr(void *);
+typedef void (timer_fnc_t) (void);
+int register_timer_isr (timer_fnc_t *isr_func);
+
+/* Architecture specific - can be in cpu/i386/, lib_i386/, or $(BOARD)/ */
 int timer_init(void);
 
 /* cpu/.../interrupts.c */