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-rw-r--r--arch/powerpc/kernel/dma-swiotlb.c30
1 files changed, 30 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..ba256c37b
--- /dev/null
+++ b/arch/powerpc/kernel/dma-swiotlb.c
@@ -0,0 +1,30 @@
+// 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;
+unsigned int ppc_swiotlb_flags;
+
+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);