sh: Split out SH-4 __flush_xxx_region() ops.

This splits out the SH-4 __flush_xxx_region() functions and defines them
as weak symbols. This allows us to provide optimized versions without
having to ifdef cache-sh4.c to death.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 63 insertions, 0 deletions

diff --git a/arch/sh/mm/flush-sh4.c b/arch/sh/mm/flush-sh4.c
new file mode 100644
index 000000000000..e6d918f6ec0b
--- /dev/null
+++ b/arch/sh/mm/flush-sh4.c
@@ -0,0 +1,63 @@
+#include <linux/mm.h>
+#include <asm/mmu_context.h>
+#include <asm/cacheflush.h>
+
+/*
+ * Write back the dirty D-caches, but not invalidate them.
+ *
+ * START: Virtual Address (U0, P1, or P3)
+ * SIZE: Size of the region.
+ */
+void __weak __flush_wback_region(void *start, int size)
+{
+        unsigned long v;
+        unsigned long begin, end;
+
+        begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
+        end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
+                & ~(L1_CACHE_BYTES-1);
+        for (v = begin; v < end; v+=L1_CACHE_BYTES) {
+                asm volatile("ocbwb     %0"
+                             : /* no output */
+                             : "m" (__m(v)));
+        }
+}
+
+/*
+ * Write back the dirty D-caches and invalidate them.
+ *
+ * START: Virtual Address (U0, P1, or P3)
+ * SIZE: Size of the region.
+ */
+void __weak __flush_purge_region(void *start, int size)
+{
+        unsigned long v;
+        unsigned long begin, end;
+
+        begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
+        end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
+                & ~(L1_CACHE_BYTES-1);
+        for (v = begin; v < end; v+=L1_CACHE_BYTES) {
+                asm volatile("ocbp      %0"
+                             : /* no output */
+                             : "m" (__m(v)));
+        }
+}
+
+/*
+ * No write back please
+ */
+void __weak __flush_invalidate_region(void *start, int size)
+{
+        unsigned long v;
+        unsigned long begin, end;
+
+        begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
+        end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
+                & ~(L1_CACHE_BYTES-1);
+        for (v = begin; v < end; v+=L1_CACHE_BYTES) {
+                asm volatile("ocbi      %0"
+                             : /* no output */
+                             : "m" (__m(v)));
+        }
+}