Initial import

1 files changed, 91 insertions, 0 deletions

diff --git a/arch/sh/mm/cache-sh2.c b/arch/sh/mm/cache-sh2.c
new file mode 100644
index 000000000..a74259f2f
--- /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;
+}