1 files changed, 108 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..cef402678f42
--- /dev/null
+++ b/arch/sh/mm/flush-sh4.c
@@ -0,0 +1,108 @@
+#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.
+ */
+static void sh4__flush_wback_region(void *start, int size)
+{
+        reg_size_t aligned_start, v, cnt, end;
+
+        aligned_start = register_align(start);
+        v = aligned_start & ~(L1_CACHE_BYTES-1);
+        end = (aligned_start + size + L1_CACHE_BYTES-1)
+                & ~(L1_CACHE_BYTES-1);
+        cnt = (end - v) / L1_CACHE_BYTES;
+
+        while (cnt >= 8) {
+                __ocbwb(v); v += L1_CACHE_BYTES;
+                __ocbwb(v); v += L1_CACHE_BYTES;
+                __ocbwb(v); v += L1_CACHE_BYTES;
+                __ocbwb(v); v += L1_CACHE_BYTES;
+                __ocbwb(v); v += L1_CACHE_BYTES;
+                __ocbwb(v); v += L1_CACHE_BYTES;
+                __ocbwb(v); v += L1_CACHE_BYTES;
+                __ocbwb(v); v += L1_CACHE_BYTES;
+                cnt -= 8;
+        }
+
+        while (cnt) {
+                __ocbwb(v); v += L1_CACHE_BYTES;
+                cnt--;
+        }
+}
+
+/*
+ * Write back the dirty D-caches and invalidate them.
+ *
+ * START: Virtual Address (U0, P1, or P3)
+ * SIZE: Size of the region.
+ */
+static void sh4__flush_purge_region(void *start, int size)
+{
+        reg_size_t aligned_start, v, cnt, end;
+
+        aligned_start = register_align(start);
+        v = aligned_start & ~(L1_CACHE_BYTES-1);
+        end = (aligned_start + size + L1_CACHE_BYTES-1)
+                & ~(L1_CACHE_BYTES-1);
+        cnt = (end - v) / L1_CACHE_BYTES;
+
+        while (cnt >= 8) {
+                __ocbp(v); v += L1_CACHE_BYTES;
+                __ocbp(v); v += L1_CACHE_BYTES;
+                __ocbp(v); v += L1_CACHE_BYTES;
+                __ocbp(v); v += L1_CACHE_BYTES;
+                __ocbp(v); v += L1_CACHE_BYTES;
+                __ocbp(v); v += L1_CACHE_BYTES;
+                __ocbp(v); v += L1_CACHE_BYTES;
+                __ocbp(v); v += L1_CACHE_BYTES;
+                cnt -= 8;
+        }
+        while (cnt) {
+                __ocbp(v); v += L1_CACHE_BYTES;
+                cnt--;
+        }
+}
+
+/*
+ * No write back please
+ */
+static void sh4__flush_invalidate_region(void *start, int size)
+{
+        reg_size_t aligned_start, v, cnt, end;
+
+        aligned_start = register_align(start);
+        v = aligned_start & ~(L1_CACHE_BYTES-1);
+        end = (aligned_start + size + L1_CACHE_BYTES-1)
+                & ~(L1_CACHE_BYTES-1);
+        cnt = (end - v) / L1_CACHE_BYTES;
+
+        while (cnt >= 8) {
+                __ocbi(v); v += L1_CACHE_BYTES;
+                __ocbi(v); v += L1_CACHE_BYTES;
+                __ocbi(v); v += L1_CACHE_BYTES;
+                __ocbi(v); v += L1_CACHE_BYTES;
+                __ocbi(v); v += L1_CACHE_BYTES;
+                __ocbi(v); v += L1_CACHE_BYTES;
+                __ocbi(v); v += L1_CACHE_BYTES;
+                __ocbi(v); v += L1_CACHE_BYTES;
+                cnt -= 8;
+        }
+
+        while (cnt) {
+                __ocbi(v); v += L1_CACHE_BYTES;
+                cnt--;
+        }
+}
+
+void __init sh4__flush_region_init(void)
+{
+        __flush_wback_region            = sh4__flush_wback_region;
+        __flush_invalidate_region       = sh4__flush_invalidate_region;
+        __flush_purge_region            = sh4__flush_purge_region;
+}