arc: cache: Add required NOPs after invalidation of instruction cache
[people/ms/u-boot.git] / arch / arc / lib / cache.c
index cbae27e..d8741fe 100644 (file)
@@ -278,6 +278,13 @@ void invalidate_icache_all(void)
        /* Any write to IC_IVIC register triggers invalidation of entire I$ */
        if (icache_status()) {
                write_aux_reg(ARC_AUX_IC_IVIC, 1);
+               /*
+                * As per ARC HS databook (see chapter 5.3.3.2)
+                * it is required to add 3 NOPs after each write to IC_IVIC.
+                */
+               __builtin_arc_nop();
+               __builtin_arc_nop();
+               __builtin_arc_nop();
                read_aux_reg(ARC_AUX_IC_CTRL);  /* blocks */
        }
 }