v4.19.13 snapshot.
diff --git a/arch/sh/mm/cache-sh2.c b/arch/sh/mm/cache-sh2.c
new file mode 100644
index 0000000..a74259f
--- /dev/null
+++ b/arch/sh/mm/cache-sh2.c
@@ -0,0 +1,91 @@
+/*
+ * arch/sh/mm/cache-sh2.c
+ *
+ * Copyright (C) 2002 Paul Mundt
+ * Copyright (C) 2008 Yoshinori Sato
+ *
+ * Released under the terms of the GNU GPL v2.0.
+ */
+
+#include <linux/init.h>
+#include <linux/mm.h>
+
+#include <asm/cache.h>
+#include <asm/addrspace.h>
+#include <asm/processor.h>
+#include <asm/cacheflush.h>
+#include <asm/io.h>
+
+static void sh2__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) {
+ unsigned long addr = CACHE_OC_ADDRESS_ARRAY | (v & 0x00000ff0);
+ int way;
+ for (way = 0; way < 4; way++) {
+ unsigned long data = __raw_readl(addr | (way << 12));
+ if ((data & CACHE_PHYSADDR_MASK) == (v & CACHE_PHYSADDR_MASK)) {
+ data &= ~SH_CACHE_UPDATED;
+ __raw_writel(data, addr | (way << 12));
+ }
+ }
+ }
+}
+
+static void sh2__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)
+ __raw_writel((v & CACHE_PHYSADDR_MASK),
+ CACHE_OC_ADDRESS_ARRAY | (v & 0x00000ff0) | 0x00000008);
+}
+
+static void sh2__flush_invalidate_region(void *start, int size)
+{
+#ifdef CONFIG_CACHE_WRITEBACK
+ /*
+ * SH-2 does not support individual line invalidation, only a
+ * global invalidate.
+ */
+ unsigned long ccr;
+ unsigned long flags;
+ local_irq_save(flags);
+ jump_to_uncached();
+
+ ccr = __raw_readl(SH_CCR);
+ ccr |= CCR_CACHE_INVALIDATE;
+ __raw_writel(ccr, SH_CCR);
+
+ back_to_cached();
+ local_irq_restore(flags);
+#else
+ 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)
+ __raw_writel((v & CACHE_PHYSADDR_MASK),
+ CACHE_OC_ADDRESS_ARRAY | (v & 0x00000ff0) | 0x00000008);
+#endif
+}
+
+void __init sh2_cache_init(void)
+{
+ __flush_wback_region = sh2__flush_wback_region;
+ __flush_purge_region = sh2__flush_purge_region;
+ __flush_invalidate_region = sh2__flush_invalidate_region;
+}