1 files changed, 29 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/dma-swiotlb.c b/arch/powerpc/kernel/dma-swiotlb.c
new file mode 100644
index 000000000..fc7816126
--- /dev/null
+++ b/arch/powerpc/kernel/dma-swiotlb.c
@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Contains routines needed to support swiotlb for ppc.
+ *
+ * Copyright (C) 2009-2010 Freescale Semiconductor, Inc.
+ * Author: Becky Bruce
+ */
+#include <linux/memblock.h>
+#include <asm/machdep.h>
+#include <asm/swiotlb.h>
+
+unsigned int ppc_swiotlb_enable;
+
+void __init swiotlb_detect_4g(void)
+{
+	if ((memblock_end_of_DRAM() - 1) > 0xffffffff)
+		ppc_swiotlb_enable = 1;
+}
+
+static int __init check_swiotlb_enabled(void)
+{
+	if (ppc_swiotlb_enable)
+		swiotlb_print_info();
+	else
+		swiotlb_exit();
+
+	return 0;
+}
+subsys_initcall(check_swiotlb_enabled);