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Diffstat (limited to 'arch/powerpc/kernel/dma-swiotlb.c')
-rw-r--r-- | arch/powerpc/kernel/dma-swiotlb.c | 30 |
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 0000000000..ba256c37bc --- /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); |