MN10300: Cache: Implement SMP global cache flushing

Implement SMP global cache flushing for MN10300.  This will be used by the AM34
which is SMP capable.

Signed-off-by: Akira Takeuchi <takeuchi.akr@jp.panasonic.com>
Signed-off-by: Kiyoshi Owada <owada.kiyoshi@jp.panasonic.com>
Signed-off-by: David Howells <dhowells@redhat.com>

1 files changed, 156 insertions, 0 deletions

diff --git a/arch/mn10300/mm/cache-smp-flush.c b/arch/mn10300/mm/cache-smp-flush.c
new file mode 100644
index 00000000000..fd51af5eaf7
--- /dev/null
+++ b/arch/mn10300/mm/cache-smp-flush.c
@@ -0,0 +1,156 @@
+/* Functions for global dcache flush when writeback caching in SMP
+ *
+ * Copyright (C) 2010 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+#include <linux/mm.h>
+#include <asm/cacheflush.h>
+#include "cache-smp.h"
+
+/**
+ * mn10300_dcache_flush - Globally flush data cache
+ *
+ * Flush the data cache on all CPUs.
+ */
+void mn10300_dcache_flush(void)
+{
+	unsigned long flags;
+
+	flags = smp_lock_cache();
+	mn10300_local_dcache_flush();
+	smp_cache_call(SMP_DCACHE_FLUSH, 0, 0);
+	smp_unlock_cache(flags);
+}
+
+/**
+ * mn10300_dcache_flush_page - Globally flush a page of data cache
+ * @start: The address of the page of memory to be flushed.
+ *
+ * Flush a range of addresses in the data cache on all CPUs covering
+ * the page that includes the given address.
+ */
+void mn10300_dcache_flush_page(unsigned long start)
+{
+	unsigned long flags;
+
+	start &= ~(PAGE_SIZE-1);
+
+	flags = smp_lock_cache();
+	mn10300_local_dcache_flush_page(start);
+	smp_cache_call(SMP_DCACHE_FLUSH_RANGE, start, start + PAGE_SIZE);
+	smp_unlock_cache(flags);
+}
+
+/**
+ * mn10300_dcache_flush_range - Globally flush range of data cache
+ * @start: The start address of the region to be flushed.
+ * @end: The end address of the region to be flushed.
+ *
+ * Flush a range of addresses in the data cache on all CPUs, between start and
+ * end-1 inclusive.
+ */
+void mn10300_dcache_flush_range(unsigned long start, unsigned long end)
+{
+	unsigned long flags;
+
+	flags = smp_lock_cache();
+	mn10300_local_dcache_flush_range(start, end);
+	smp_cache_call(SMP_DCACHE_FLUSH_RANGE, start, end);
+	smp_unlock_cache(flags);
+}
+
+/**
+ * mn10300_dcache_flush_range2 - Globally flush range of data cache
+ * @start: The start address of the region to be flushed.
+ * @size: The size of the region to be flushed.
+ *
+ * Flush a range of addresses in the data cache on all CPUs, between start and
+ * start+size-1 inclusive.
+ */
+void mn10300_dcache_flush_range2(unsigned long start, unsigned long size)
+{
+	unsigned long flags;
+
+	flags = smp_lock_cache();
+	mn10300_local_dcache_flush_range2(start, size);
+	smp_cache_call(SMP_DCACHE_FLUSH_RANGE, start, start + size);
+	smp_unlock_cache(flags);
+}
+
+/**
+ * mn10300_dcache_flush_inv - Globally flush and invalidate data cache
+ *
+ * Flush and invalidate the data cache on all CPUs.
+ */
+void mn10300_dcache_flush_inv(void)
+{
+	unsigned long flags;
+
+	flags = smp_lock_cache();
+	mn10300_local_dcache_flush_inv();
+	smp_cache_call(SMP_DCACHE_FLUSH_INV, 0, 0);
+	smp_unlock_cache(flags);
+}
+
+/**
+ * mn10300_dcache_flush_inv_page - Globally flush and invalidate a page of data
+ *	cache
+ * @start: The address of the page of memory to be flushed and invalidated.
+ *
+ * Flush and invalidate a range of addresses in the data cache on all CPUs
+ * covering the page that includes the given address.
+ */
+void mn10300_dcache_flush_inv_page(unsigned long start)
+{
+	unsigned long flags;
+
+	start &= ~(PAGE_SIZE-1);
+
+	flags = smp_lock_cache();
+	mn10300_local_dcache_flush_inv_page(start);
+	smp_cache_call(SMP_DCACHE_FLUSH_INV_RANGE, start, start + PAGE_SIZE);
+	smp_unlock_cache(flags);
+}
+
+/**
+ * mn10300_dcache_flush_inv_range - Globally flush and invalidate range of data
+ *	cache
+ * @start: The start address of the region to be flushed and invalidated.
+ * @end: The end address of the region to be flushed and invalidated.
+ *
+ * Flush and invalidate a range of addresses in the data cache on all CPUs,
+ * between start and end-1 inclusive.
+ */
+void mn10300_dcache_flush_inv_range(unsigned long start, unsigned long end)
+{
+	unsigned long flags;
+
+	flags = smp_lock_cache();
+	mn10300_local_dcache_flush_inv_range(start, end);
+	smp_cache_call(SMP_DCACHE_FLUSH_INV_RANGE, start, end);
+	smp_unlock_cache(flags);
+}
+
+/**
+ * mn10300_dcache_flush_inv_range2 - Globally flush and invalidate range of data
+ *	cache
+ * @start: The start address of the region to be flushed and invalidated.
+ * @size: The size of the region to be flushed and invalidated.
+ *
+ * Flush and invalidate a range of addresses in the data cache on all CPUs,
+ * between start and start+size-1 inclusive.
+ */
+void mn10300_dcache_flush_inv_range2(unsigned long start, unsigned long size)
+{
+	unsigned long flags;
+
+	flags = smp_lock_cache();
+	mn10300_local_dcache_flush_inv_range2(start, size);
+	smp_cache_call(SMP_DCACHE_FLUSH_INV_RANGE, start, start + size);
+	smp_unlock_cache(flags);
+}