1 files changed, 23 insertions, 0 deletions

diff --git a/arch/mips/lemote/lm2e/mem.c b/arch/mips/lemote/lm2e/mem.c
new file mode 100644
index 000000000000..16cd21587d34
--- /dev/null
+++ b/arch/mips/lemote/lm2e/mem.c
@@ -0,0 +1,23 @@
+/*
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+#include <linux/fs.h>
+#include <linux/fcntl.h>
+#include <linux/mm.h>
+
+/* override of arch/mips/mm/cache.c: __uncached_access */
+int __uncached_access(struct file *file, unsigned long addr)
+{
+        if (file->f_flags & O_SYNC)
+                return 1;
+
+        /*
+         * On the Lemote Loongson 2e system, the peripheral registers
+         * reside between 0x1000:0000 and 0x2000:0000.
+         */
+        return addr >= __pa(high_memory) ||
+                ((addr >= 0x10000000) && (addr < 0x20000000));
+}