sh: Add support SH4 cache control

Add support SH4 cache control and flash_cache function

Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>

include/asm-sh/cache.h

@@ -0,0 +1,35 @@
+#ifndef __ASM_SH_CACHE_H
+#define __ASM_SH_CACHE_H
+
+#if defined(CONFIG_SH4) || defined(CONFIG_SH4A)
+
+#define L1_CACHE_BYTES 32
+struct __large_struct { unsigned long buf[100]; };
+#define __m(x) (*(struct __large_struct *)(x))
+
+void dcache_wback_range(u32 start, u32 end)
+{
+    u32 v;
+
+    start &= ~(L1_CACHE_BYTES-1);
+    for (v = start; v < end; v+=L1_CACHE_BYTES) {
+        asm volatile("ocbwb     %0"
+                     : /* no output */
+                     : "m" (__m(v)));
+    }
+}
+
+void dcache_invalid_range(u32 start, u32 end)
+{
+    u32 v;
+
+    start &= ~(L1_CACHE_BYTES-1);
+    for (v = start; v < end; v+=L1_CACHE_BYTES) {
+        asm volatile("ocbi     %0"
+                     : /* no output */
+                     : "m" (__m(v)));
+    }
+}
+#endif /* CONFIG_SH4 || CONFIG_SH4A */
+
+#endif	/* __ASM_SH_CACHE_H */